Atc Cnc Router Buying Guide

Atc Cnc Router Buying Guide

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Application of Low Frequency Band Tracking Signal Generator System in Spectrum Analyzer
Application of Low Frequency Band Tracking Signal Generator System in Spectrum Analyzer
For a long time, spectrum analyzer and tracking signal generator have measured the swept scalar frequency response of active and passive networks. Although many spectrum analyzers have the option of tracking signal generator, most of these signal generators can only provide sweep signals for the basic frequency band of the analyzer. The following method will also cover the first extended high frequency band of many spectrum analyzers. In addition, a method to allow scanning of the measured component with intermediate frequency conversion is also given.Fig. 1 shows a common RF spectrum analysis structure with tracking source function. In this structure, the tracking signal generator is realized by a mixer, an amplifier and an RF signal generator set at the first fixed intermediate frequency (if). For this scheme, frequency scanning can be realized only when the analyzer scans the first local oscillator (LO). In addition, the analyzer must also provide output sampling of the first LO. If the resolution bandwidth (RBW) filter (whether analog or digital) of the analyzer is fixed and only the first LO is scanned, this scheme can output the correct signal.In this configuration, the signal generator is set to the first if of the desired frequency band (which can be obtained from the analyzer manufacturer's data or experiments). The first if can be found by using the widest resolution bandwidth (RBW) filter and adjusting the signal generator until there is a rise in the noise base on the analyzer. By switching to a narrower RBW and adjusting the signal generator to the maximum amplitude, the if value can be estimated more accurately.When the first LO signal of the analyzer is mixed with the first IF signal of the signal generator, the output of the mixer will contain a spectrum component, which is just the RF signal tuned by the analyzer at that point in the scanning (scanning signal generator signal). Then put the DUT between the mixer output and the RF input of the analyzer. The signal of the tracking signal generator will be scanned automatically during the scanning process, providing a fully synchronous signal for the swept scalar measurement.Although it is a good idea to connect the lo output of the analyzer directly to the mixer, this will cause problems for most analyzers. Generally, there is not enough reverse isolation at the first LO output. As a result, the first IF signal of the signal generator will leak to the first if stage of the analyzer, so as to enter the first and subsequent if stages of the instrument, so as to improve the noise base.A circulator can increase isolation (about 20dB), but reduce the first LO power sent to the mixer. A better way is to use a high isolation amplifier, which can provide up to 50dB isolation in the frequency band up to 6GHz. In addition, it can allow broadband operation, and can achieve a good lo driving level when only the first LO with low power can be obtained. The input power of this high isolation amplifier is 0dbm.This improved method and configuration are shown in Figure 1, which is the basis of two tracking signal generator systems developed by DKD company. In one system (model tg100), the mixer and high isolation amplifier are integrated together (Fig. 2). In another system (model tg200), the amplifier is a separate module, so that different mixers can be used for specific analyzers in low and high frequency bands (Fig. 3). The former operates in the frequency band of 500KHz to 2.6GHz, and its first high frequency extension range is 2.0 to 4.5ghz. The latter uses one mixer for the low frequency band (to 2.6 GHz) and another mixer for the first high frequency extension band (to 6 GHz). The optimal input power of both systems is 0dbm. For many analyzers, adding a first LO frequency multiplier and an appropriate mixer can work to the second high frequency expansion band. For many instruments, the frequency band is above 10GHz.Figure 4 shows the second tracking signal generator system, in which hp8566a / b spectrum analyzer from Agilent is used. The signal generator is configured to cover the first frequency band (DC to 2.5GHz) of the spectrum analyzer. The first if of the instrument in the low frequency band is 3621.4mhz, and the power of the signal generator at this frequency is about 6dbm. In this configuration, the signal generator inputs the radio frequency (R) port of the mixer, the sampling of the first LO is input to the local oscillator (L) port, and the intermediate frequency (I) port contains the difference signal generated by mixing, that is, the output signal of the tracking signal generator. The mixed sum product is also added to the input of the DUT, but its frequency is 2 × (3621.4mhz) = 7242.8mhz or higher. The 3dB attenuator on the I port improves the VSWR when looking back from the DUT to the tracking signal generator. The 6dB attenuator reduces the LO signal power from hp8566 to 0dbm more suitable for tracking signal generator.Using this test configuration for measurement, the DUT is a straight through transmission line (Fig. 5) with a frequency range from DC to 2.5GHz. Manually set the resolution bandwidth filter to 3kHz, and manually set the video bandwidth and scanning time. At this time, the uncalibrated results show that there is about 7dB attenuation (roll off) from low end to high end. When the analyzer input and tracking signal generator output are 50? When the terminal replaces the tested part of the straight line, the noise base can be seen over the dynamic range of more than 80dB (Fig. 6). Subtract (graphically) the attenuation corresponding to the straight line in Figure 1 from the analyzer results. The result of video subtraction is a flat trace when connecting the through line. Because the correction is through video storage [vidmem_ A - (vidmem_bdl)], due to roll down, the noise base at the high end will rise. Therefore, using 3kHz RBW, 3621.4mhz signal power of 8dbm, 10dB internal attenuation and i-port 3dB attenuator, the dynamic range of about 80dB can be realized.The choice of resolution bandwidth (RBW) of spectrum analyzer is mainly determined by the quality of signal generator. For unstable signal sources, such as non phase locked cavity signal generator, the narrowest RBW filter available is about 100kHz. The relatively stable signal source allows the use of narrowband RBW filter. Of course, with the widening of RBW filter band, the base noise of the system will also increase and the dynamic range will decrease.The low frequency band tracking signal generator system can be used to measure a band-pass filter with a center frequency of 1445mhz (Fig. 7). The start frequency is 1345mhz and the cut-off frequency is 1545mhz. The ordinate scale is 10dB / div, the attenuation of the analyzer is set to 10dB, 1s frequency sweep period, 10kHz RBW and 3khzvbw. Before scanning, the reference line is set by using image subtraction to remove the change in the output line of the tracking oscillator.As shown in Fig. 8, the tg200 is configured to provide a tracking generator scanning signal for the first extended high frequency band of the hp8566 spectrum analyzer. For this high band measurement, port 1 of the mixer is connected to the signal generator. The frequency corresponding to the first if end of the full band (2 to 22 GHz) analyzer is 321.4 MHz (the signal generator is tuned at this frequency). At this time, the R port of the mixer contains an effective tracking generator signal and a harmful image. The YIG tracking filter at the input of the analyzer can effectively eliminate this harmful mirror signal.Figure 9 shows the tg100 system for low frequency measurement of hp8568a / b spectrum analyzer (DC to 1.5GHz). For the fixed second LO, the rated working frequency of the first if end of the analyzer is 2050.300mhz (the signal generator is tuned at this frequency), but the second LO has a certain amount of scanning range, which is less than 2MHz. The scanning function of the second LO port signal can be disabled by using the "shiftt" instruction sequence without affecting the performance of the tracking signal generator. At this time, make the analyzer work in the mode that only the frequency sweep of the first LO port and the signal of the first if port are fixed. When 50 loads are terminated, the results show that the dynamic range of the test device is about 90dB.When scanning and analyzing frequency conversion devices (such as mixers), most existing tracking generation oscillators and network analyzers do not allow bias to the input signal. However, such a measurement can be made using the tg100 / 200 system, provided that the frequency offset introduced by the DUT does not exceed the limit of the first if of the spectrum analyzer. By inputting the offset compensation signal on the signal generator connected to the tg100 / 200 system, the frequency conversion tested component can be swept and analyzed.For example, a down converter is scanned and analyzed using tg100 module and hp8566 (FIG. 10). Generally, in order to apply tg100 and hp8566 in the first frequency band, the signal generator frequency is set to 3621.4mhz. However, since the DUT in this example uses a mixer with LO frequency of 232.6mhz, the signal must be offset compensated, otherwise it will be wrong to track the output signal of the oscillator. The solution is to set the offset compensation frequency of the signal generator to 232.6mhz, so that the output frequency of the signal generator is 3388.8mhz. In this way, the tracking generator outputs the correct frequency that can compensate for the internal frequency offset of the DUT.
5 Historic Artifacts You Won't Believe still Work
Unless you're talking about diamonds, Twinkies or vampires, lasting forever usually isn't in the cards. Yet all over the world -- and universe -- there are machines, engineering feats and pieces of meat that never got the memo that we all have a use-by date. If we didn't know any better, we'd think these things were actually us with their tenacity.5The Light Bulb That Has Been Shining for 110 YearsIn 1901, the Livermore Fire Department in California decided it was time to try that newfangled "electricity" thing all the kids were jabbering about. So they installed electrical lighting in the station, complete with modern light bulbs and everything.And 110 years later, one of those original bulbs is still doing its thing.When you look at the statistics, this is truly mind-boggling: Old-style incandescent light bulbs only last , while newer bulbs can go up to 25,000 hours with moderate use. The Livermore bulb, by comparison, has been in near-continuous use for over 110 years, and . That time period alone is .In the early '70s, a reporter (who was apparently going through one hell of a slow news day) found out about the old bulb and started digging around. Instead of printing a half-assed article filled with light bulb jokes, he the , and General Electric. When they all verified that the bulb was actually the oldest functioning one in the world, the town went nuts, even giving the bulb when it was switched between the old fire station and a new one in 1976.Since then, it has gained widespread attention and the media friendly, in-no-way-pompous nickname of .4The 2,000-Year-Old Tomb ... With Working Booby TrapsIf there's anything that adventure movies have taught us, besides the importance of sports bras, it's that tombs are tricky business. Yes, they hold rich stuff and hidden pirate ships and badass skeletons sporting diamond eyes, and yes, those facts are totally scientific and not stolen from , but they're also rigged with things that will kill you. One misstep on an ancient tripwire or floor tile, and BAM! Decapitating blades, giant spikes and crushing drop ceilings for everyone!Of course, that's just what the movies would have us believe. In reality, the burden of countless centuries would easily obliterate such delicate designs, as wood and rope and other old-time building supplies would have rotted to dust by now. Right?Well ...The mausoleum of the ancient Chinese emperor was discovered in the 1970s. You might have heard about the fantastic, world famous found guarding it. A less known fact is that to this day, the site remains largely unexplored. This is largely because of pressing moral questions about preserving the past and a shitload of cunning booby traps that might still totally work.Ancient writings about intricate traps and contraptions such as pressure-sensitive crossbows and murderous mini-oceans full of mercury were dismissed as fairy tales ... that is, until scientists ran probes into the tomb, just on the off chance that there was something to the legends of mercury rivers guarding the long-dead emperor. What did they find? A fire-breathing dragon! Just kidding. A lot of mercury is what they found -- at levels . The scientists couldn't help but think there might be something to the ancient warnings.But what about the automatic crossbow contraptions? Those would be long rusted by now, right? Nope -- other weapons excavated in the tomb were coated with something called chromate, which made them rust-resistant. So it only makes sense that the hair-trigger crossbows were also coated with the stuff, since they were the ones guarding the emperor and all. And according to , "."After this find, the excavation staff was naturally pretty reluctant to venture farther into the tomb. They were still willing to do some further research, perhaps eventually going as far as opening the tomb itself. However, the Chinese government and, presumably not wanting to become the first nation to host a reenactment of the opening scenes of , vetoed further excavations. This ban lasted ... and even today, archaeologists must remain well away from the tomb itself, probably so that a giant rolling rock doesn't crush them.3The "Temporary" Dam ... Built 2,000 Years AgoIn the second century, the Indian Chola government to divert water for irrigation. However, due to the on the decided spot, the area was particularly prone to floods. So before they could actually get around to building a dam, a rough, makeshift stone-block version was hastily constructed for the oncoming rainy season, with the reasoning that they would build a new one in about 20 years when this one inevitably failed.However, like so many government-funded projects, the construction of a better dam was delayed again and again and again. So the makeshift dam did what it could, then finally fell apart and gave the people of the plains below the gift of a watery grave.Ha, no, not really. No matter how much water came, . Decade after decade, century after century, . In fact, up until the bossing around 1,500 years later, the supposedly temporary construct -- now known as the Grand Anicut -- was the area's only line of defense against the huge floods that attempted to kill everyone on a yearly basis. In photos, you see some modern additions to the dam, but make no mistake: The original structure is still there, doing its job.It turned out the Grand Anicut's unique "just build it however" design was, by sheer stupid luck, actually one of the best ways to build a dam, ever. It was so efficient and cost-effective that the British engineers ended up of the of the people they were supposed to be governing.2The Twin Satellites That Refuse to DieWhen satellites are sent out into space, scientists generally hope for a few good years of info before the equipment succumbs to the cold abyss and/or is eaten by Space Trolls. Few orbiting satellites get past their 10th birthday, and operating that long of orbit is pretty much unheard of.Except, that is, for the .In 1977, NASA to gather data on Jupiter and Saturn. Their life expectancy was estimated to be four years, but after five had passed, the satellites just kept on trucking. People started wondering what would happen if NASA just kept them out there ... forever. Voyager 1 on a course to outer space, and Voyager 2 got a ticket to explore Neptune and Uranus.Thirty-five years and 14.5 billion miles from Earth, both Voyagers are working as well as they did the day they were launched. And although most of their current data is strictly confined to how cold and empty space is, they might still have a role to play: They are about to exit the sun's sphere of gravity, and will soon, for the first time in history, provide invaluable firsthand information about what lies beyond.1The 36,000-Year-Old DinnerAt some point, we've all stretched the scientific limits for how long food can last before it becomes inedible and/or poisonous. Meat can generally be safely kept in a freezer for . Military Meals Ready to Eat (MREs), if stored properly, . The canning process can give certain foods a shelf life of decades. And the Arctic ... well, it can apparently preserve an edible bison or woolly mammoth for a few dozen centuries. And yes, humans have eaten them.First, let us rewind to 10,000 years ago, the time when were roaming Siberia. When they died, their carcasses were lost in the permafrost. Frozen solid, they could , as if they'd perished just yesterday. And as the mammoths slowly became extinct, their hulking bodies remained frozen in the hellish wastelands we now lovingly call the Arctic.So in the 1920s, people started finding mammoth bodies with meat so well preserved as to be edible ... if you call half-rotted and definitely freezer burned "edible." Having better food available, and also common sense, the meat was reportedly .But in the early 2000s, Russian scientists weren't as choosy or concerned with self-preservation. Feeling the urge for some sweet, sweet mammoth steak, one reckless soul carved a bit off of the they had in their cold storage and Epic Meal Timed the s**t out of it.The resulting banquet was perfectly edible all right, but tasted "awful" and, shockingly, not unlike "meat left too long in a freezer."That's not to say ancient meat tastes like ass, though. When a 36,000-year-old baby bison was found frozen in Alaska in 1979, one scientist knew exactly what to do with it. He performed a bunch of experiments ... and then calmly carved some meat out of it and , because heavy sciencing makes for a heavy appetite.The stew was not only edible, but deemed "." So, yeah, that meatloaf you've had in the freezer since 1994? Some day, after civilization has collapsed, risen again and collapsed once more, some cyborg will heat that s**t up and declare it "OK."
What Is the Single Greatest Battlefield Blunder in History?
After reading the answers Im quite surprised that no-one has mentioned the Battle of KarnsebesIt was only several months into the Austro-Turkish war (17881791) that the Austrian army of around 100,000 men took up positions around the town of Karansebes. A small hussar regiment crossed the river Timis to to the east in order to scout the Ottoman military positions, they did not find any Ottomans, but they did find schnapps merchants. Who they promptly bought alcohol from and started drinking. A few hours of drunken fun later an infantry regiment also crossed the river and discovered the drunken hussars, they demanded the alcohol be shared, the hussars disagreed. The dispute escalated between the two groups until a shot was fired. The two Austrian regiments started a fire fight over the, now barricaded, booze. The fight lasted until nightfall when amongst the fighting some soldiers started yelling Turks! Turks! This caused the hussars to panic and flee, they galloped out of order and still drunk back through the Austrian camps causing the soldiers, in the camps, to think they were under surprise attack from the Ottomans. In the chaos they started firing on their own men. A state of panic ensued where the entire force was firing on each other before the entire army fled.The Ottomans crossed the river and arrived at Karansebes the following day only to find around 1,200 dead bodies and an abandoned town• Suggested ReadingWhy is Ohio leaning to Donald Trump when similar states like Illinois or Pennsylvania are not?Thats a very good question.Ohio looks like two states superimposed on one another. The large cities, with the exception of Cincinnati, are heavily Democratic, liberal, multicultural and educatedit is part a Great Lakes culture that is the same in Columbus as it is in Chicago, Minneapolis or even Toronto. The small towns and countryside are much more conservative, both socially and economically. The Southeastern part of the state is part of Appalachian culture, and has more in common with Kentucky and West Virginia more than it does Cleveland or Akron. Ohios population is growing (and is projected to grow) much more slowly than the country as a whole. This is a big problem for us.Add to that the strongly negative views of the trade deals cut under the last three administrations, which have coincided with the hollowing out of manufacturing jobs in the Midwest which allowed non-college educated workers to earn well enough to support a family. People here associate Hillary Clinton with those trade deals and with globalization more generally, and it hurts her.That said, I would like to see ore polls of Ohio after the first debate. Im not yet convinced that Ohio is actually going to vote differently from the national polls in this electionso either the national or state polls may be off.Update 10/4: A new set of Ohio polls have come out which have the race essentially tied------Why did Jungkook not allow Jimin to go to Taehyungu2019s Vlive (which V had said himself)?Jimin wants to come. Jungkook is stopping Jimin from coming.To me, that doesnt sound great. I know many people, i.e. Jikook shippers, use this moment as proof that Jikook are always together and uwu so cute, but to be honest, IF that were related to Jikook, JK stopping Jimin from coming wouldnt be uwu cute but signs of (potentially toxic) possessiveness which (kids) y'all dont want a man to act that way.BUT, stepping aside from ships and back into reality, my best guess is that Tae and JK simply had a fight and JK, who at the time was quite controlling of Jimin due to (what I assume) were insecurities caused by Tae forming friendships outside of BTS (Hwarang etc). We saw and heard from both Jimin and JK that they were a bit jealous and Jimin even went as far as telling Tae to go play with your Hwarang hyungs while JK asked me or Bogum after the latter came to their concert in Hong Kong.Idols, just like us, are people. They make mistakes, get possessive, do things they might regret later. Tae seemed sad in that vlive and in turn it made me sad to see him so upset by Jimin not being able to come, for his best friend to console him or even just be there with him to cheer him up or something, but the good things is, this has been years ago so there's no use in dwelling of what may or may not have been the cause of this back then------How was Einstein influenced by Maxwell?He was crucially influenced by Maxwellu2019s work:-In Maxwells theory of electromagnetism, he derived an equation showing that an electromagnetic wave always propagates at a fixed speed relative to any system; Einstein, thinking of what it would be like to be riding on such a wave that Maxwell described, realised this must be illustrating a failure of our traditional views of relative velocities and hence the relationship of space and time. This led him directly to his theory of Special Relativity.In atomic physics he believed Maxwell and Boltzmannu2019s on the kinetic theory of gases, in which the behaviour was derived by assuming the reality of atoms, a theory much derided by people like Mach - the ridicule probably contributing to Boltzmannu2019s suicide. By analysing the detailed data obtained by Perrin on the curious jiggling of tiny grains in water (first described by Brown & known as Brownian motion) Einstein was able, once and for all, to show that this demonstrated the reality of atoms.He published this work 1905, the same year as he Special Relativity, and also his work on the absorption of electromagnetic radiation by the photo-electric effect, which was seminal in the birth of quantum theory and won him the Nobel Prize he should have probably got one for each of these, & a 4th for General Relativity 10 years later.Thus the greatest of 20th century physicists stood on the shoulders of possibly the greatest of the 19th century!.------What country should most countries fear?This is probably going to be slightly unpopular (or really unpopular, this isnt bashing Quora but in my few months here Ive detected a LOT of anti-American sentiment) but Im going to go with North Korea. Donald Trump and South Koreas president Moon Jae-in will both be having direct talks with Kim Jung-Un soon. Good for Mr. Moon, stupid for Mr. Trump. I wont get into detail about the differences why other than to briefly say: because Moon stands to gain a lot more than Trump, and his business skills/art of the deal is giving NK a great piece of publicity with nothing in return. However I will say the closest weve come (or are still currently at) to nuclear war since the cuban missle crisis is right now. And were not dealing with a rational leader on the other side of MAD (or hell our own side, Trump is a moronic loose cannon). Its still unknown if NK can strike the U.S. mainland, its not debatable they could destroy two of our closest allies and cause millions of casualties.To be clear: I am NOT saying the U.S. isnt an extremely dangerous country (especially under Trump), Im saying if Im any country (including China, they prop up the Kim regime not to spite America, they do it to avoid millions of refugees flooding their country) at this point governments are and should be more scared of NK than the U.S. Americans are tired of war and have much to lose, NK isnt afraid of war and has nothing to lose. Kim isnt afraid to let millions die. Despite rhetoric Trump, Moon, Shinzo Abe, and so on are extremely afraid of the worst case scenarios------Does Prince Charles get on with Prince Andrew?Who knows?I am sure they get along well. They are a civilized family after all. Certainly their children seem to be best friends.Prince Charles wanting to streamline the family is not a reflection of how he personally feels about Andrew. This is just his view of how the royal institution should be run. It is his duty to plan the future of their institution and assure itu2019s survival. Right now he is the functional head even though he is not the titular head. The Queen has essentially giving up the reins to him. He has a duty to have a vision for his family going forward.Compare the Royal family to other feudal families. The heir or eldest son takes the reins and all the rest go their way and make do the best they can.The royal family however has become big , bulky and unwieldy. Better to make it clear they should find their own way and not expect to be subsidized forever. He is making it clear to everyone, not just Andrew.I am sure he has discussed this with his own children and with his other siblings.I am sure Harry is prepared that his children are not going to be subsidized either.Anne was lucky in that both she and her first husband were Olympic level talents itu2019s easy for them to build a career and raise kids who knew how to support themselves.Edward also was lucky to have a very capable intelligent wife who can take care of herself.Harry also looks like he married well. Meghan will land on her feet no matter what.Andrew would have done well if he had made the Army his career.But The Firm has to modernize. And Charles has a difficult task ahead.Itu2019s nothing personal.------Did the Big Bang really happen? Is that just a guess? How did the universe come into existence?Yes. No. We donu2019t know.When it was discovered that instead of a steady-state universe, the galaxies were moving away from us, there was a rush to explain the observations in terms of Einsteinu2019s General Relativity framework. Since these equations should work going in either time direction, it was realized that if you looked further and further in time, everything was closer together. If you went back far enough everything would converge to a single point.Hubbel, who had originally supported the steady-state model was dismissive of what his observations implied. George LeMaitre, a priest who helped developed the expansionary model noted that if you went back far enough that everything would be in a single point. Hubbel called this the big bang and it stuck. But no one thought there was an explosion or a cataclysmic event. And as time progressed and our understanding of the universe increased, it became clear that the universe was once extremely dense and hot. And this created an expansionary pressure. As the universe grew, the pressure and density fell allowing first atomic particles to form, later nuclei formed allowing light to propagate which we see in the CMBR. The more we observe, the more these ideas pull together and the richer thee framework becomes even while there is disagreement on certain difficult to observe portions of the universe. For example, we cannot observe anything before the CMBR formed because light canu2019t get to us from these times. So we can only infer what the first 380,000 years looked like. And never did the model seek to explain why the universe was once arbitrarily small and highly dense,However, General Relativity would no longer hold as the theory is undefined due to curvature approaching infinity
Solar Powered Outdoor Light
The introduction of outdoor solar lightThe introduction of solar outdoor lighting in an enclosed space is the first step towards a larger system.Tips for outdoor solar lightThe use of solar light is not new. It has been used for centuries in almost all countries. But in this time, solar lighting systems have become more sophisticated and affordable.We should not think of these solar lighters as a replacement for conventional energy sources. In fact, they are just another way to get energy from sunlight and thus help reduce the need to generate power from the grid.How to use outdoor solar light?Today’s world is an energy-efficient one. But we also need to have some light sources in the outdoors to avoid the dark mornings. So, what does a cloud look like? What happens if it rains? And then there is the question of indoor lighting: how do I turn on my lights at night, and when may I leave my house in the dark?The specifications of outdoor solar lightSolar lights are becoming more and more popular. They can be used as a solar light for the night time or as a light for the day time. They also provide us with an important source of energy at night.The product instructions of outdoor solar lightYou need a product manual which clearly tells the end-user about what he needs to do in order to use the product and how to use it safely.Inexpensive and low impact print media can be problematic for outdoor lighting manufacturers. The manufacturer needs a user guide that clearly explains how to install and use the product, and guidelines for best practices in terms of installation, care, maintenance and repair.In this article, we will take a look at an example from the world of professional sports. Sports have their own unique characteristics, which are not always found in other areas of life like medicine or psychology or even education (see chapter "The Psychology of Sports"). Thankfully they do not have these problems when it comes to outdoor lighting.The application of outdoor solar lightSolar energy is no longer a luxury, it is an essential source of energy. In order to meet the ever increasing demand of this precious resource, solar lighting systems have now become a necessity for many households.The market has also been growing rapidly and more and more people are investing in solar lighting systems. However, due to the fact that these light systems are expensive, they can be difficult to install correctly. Sometimes they can even be damaged by the weather or other conditions such as hail storms or floods.
cnc router price 8 Spindle Multi Head Wood Carving Woodworking MDF CNC Router Machine Guidelines
cnc router price 8 Spindle Multi Head Wood Carving Woodworking MDF CNC Router Machine Guidelines
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Our machines can be widely used in different products manufacture. We have a strict quality management system. Our products are safe and reliable. We provide 24 hours online after-sales service. We have 10 years sales and technical experience. All our products must be 100% tested to ensure their functions, reliability, security and durability before shipment. The warranty period for machines is 24 months. We provide 24 hours online technical support for some machines. We provide customers with high quality pre-sales, sales and after-sales online service through social media in 24 hours. All our products must be 100% tested to ensure their functionality, reliability, security and durability before shipment. We will supply with the machine operation video in English version for installing and operation. We can also provide free training on machine installation and operation. Plasma Cutter 1530 provids high precision cutting as well as operation safety protection for users. 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Knowledge related to Edwin J. Larson
Edwin J. Larson (November 29, 1885 August 21, 1949) was an American politician and businessman. Born in Waupaca, Wisconsin, Larson moved with his parents to Plymouth, Wisconsin in 1892. He graduated from Plymouth High School in 1902. He was president of the Plymouth Refrigerator Company from 1920 to 1930. He then worked in the real estate, loans, and banking business. From 1926 to 1928, Larson served on the Plymouth Common Council. He also served on the power and light board of Plymouth Utilities. From 1939 to 1945, Larson served in the Wisconsin State Assembly as a Republican. At the time of his death, Larson was involved with the Dairy State Transportation Company. Larson died suddenly of a heart attack at his home in Plymouth, Wisconsin. • Other Related Knowledge of light board Education and career of light board Born in Malvern, Arkansas, Overton received a Bachelor of Arts degree and a Bachelor of Science degree concurrently from the University of Arkansas in 1961, and a Bachelor of Laws from the University of Arkansas School of Law in 1964. He was in private practice of law in Little Rock, Arkansas from 1964 to 1979. ------ Places of light board Back (crater), lunar crater Back, Lewis, a village on the Isle of Lewis, Scotland Back Bay, an area in Boston, Massachusetts, USA Back Peninsula, Nunavut, Canada Back railway station, in Back, Manitoba, Canada The Backs, an area at the rear of several colleges in Cambridge, England ------ Post-war decommissioning and sale of light board She sailed north on June 1 and reached New York on the 2nd. Berberry was decommissioned at the New York Navy Yard on June 10. Sold at public auction there on July 12, she was redocumented as Rescue on July 31. The tug served through the turn of the century and was sold to a foreign purchaser in 1902 ------ Early settlers of light board Early settlers included the Dalton family, the patriarch being Captain John Dalton who sailed his ship SS Kingsley to Sydney with fresh marine produce from Port Stephens. He built a house "Westward Ho" in 1882 on the hill overlooking the modern town, on 16Âha (40 acres). He donated land from his holding for the Methodist Church, and for a school. . ------ Operations of light board Racing takes place every Monday and Friday evening and the facilities include a fast food outlet, a bar, totalisator betting and inside and outside viewing areas. Race distances are 325, 525 and 550 yards and the track has several feature events in the Irish racing calendar. ------ Influences of light board The novel introduces FIDO (Foreign Intruder Defense Organism), a semi-organic droid defensive system set up to defend the Solo children. Kevin J. Anderson has said that the name was a reference to the FidoNet Star Wars Echo, an on-line message board that he took part in at the time ------ Sectors represented in UFCW 832 of light board This is a partial list of sectors represented by UFCW 832. Grocery (Safeway, Westfair, Co-op, Sobeys) Meatpacking (Maple Leaf Consumer Foods, Hylife Foods) Poultry (Granny's Poultry Co-op Ltd., Dunn-Rite Foods) Healthcare (Grace Hospital, BRHA (Burntwood Regional Health Authority) Security (Garda, Securitas, Impact, G4S, Avion) Light Industrial (Federated Co-op, Sysco, General Mills, Naleway, Old Dutch Foods, Lucerne) ------ Sentinels of the Sea of light board In July 2008, the Mystic Seaport Light became part of the visitor experience when the interior was opened as part of the "Sentinels of the Sea" exhibit. The exhibit displays two short educational films, The Heyday of Lighthouses and How to Look at a Lighthouse, on five LCD screens. The two films highlight the history and architectural diversity of American lighthouses. . ------ Writings of light board Prothero published The Pioneers and Progress of English Farming in 1888. His other works include, English Farming Past and Present, The Psalms in Human Life, Life and Correspondence of Arthur Penrhyn Stanley, published in 1893, and Letters and Journals of Lord Byron (18981901). His autobiography was entitled From Whippingham to Westminster. In 1901 he was appointed a Member of the Royal Victorian Order (MVO). ------ Students of light board The University of Miami School of Law has a total student body of approximately 1,250. For the class of 2021, 50% are female, 50% are minorities, 44% come from out-of-state, 58% speak more than one language, and 37% enroll directly after graduating from college. Students range in age from 19 to 49. The 75th/25th percentiles for the LSAT are 161/155 and for undergraduate GPA are 3. 65/3. 17. . ------ AwardsLeadership roles of light board Board of Trustees, Manhattan School of Music Advisory Council, Department of Music, Princeton University Artistic Advisory Council, National Sawdust Artistic Advisory Board, The Glimmerglass Festival Artistic Advisory Board, Brooklyn Youth Chorus Board of Directors, American Opera Projects Advisory Board, Brooklyn Music School Advisor to the Board, Jonah Bokaer Arts Foundation ------ Scholarship of light board His scholarship includes articles on the global warming regime complex, regional greenhouse gas regulatory regimes in the United States, regulation of alternative energies, administrative law, environmental rights, protection of sacred sites and cultural property, and indigenous peoples' participatory rights in international law, among other topics. ------ Munkeruphus today of light board Munkeruphus is operated as a self-owning institution. It plays host to 56 exhibitions a year about art, crafts, design, architecture or other themes. It also serves as a venue for lectures and indoor as well as outdoor concerts. There is also a caf which serves light lunch meals, cakes and hot and cold drinks in the ground floor of the rear wing ------ Bhumi of light board Bhumi is the world created by Fluid Comics in which DevaShard and the stories in other titles take place. Bhumi contains many lands, each of which has different landscapes, individual weather patterns and its own wildlife. Each land is also populated by people with distinct appearances, history, culture and civilisations. ------ Centenary of light board The centenary of Sea Scouting was celebrated in 2009. The Centenary Sea Scout Jamboree was held in August of that year, at the Holme Pierrepont National Watersports Centre in Nottinghamshire. Around 3,000 Sea Scouts participated in the event and came from around the world. . ------ Management of light board In 2015, it was announced that CSU had an agreement with the management of Rocket Mortgage FieldHouse (formerly Quicken Loans Arena aka "The Q"), where the FieldHouse would essentially take over operations of the Wolstein Center, promoting and booking events at the venue, while in return select Vikings men's basketball games would be played at the FieldHouse. ------ Resource Centre of light board The Resource Centre at Eastern College Australia contains over 85,000 items including: reference materials, books and audio-visual materials. In addition Eastern's Resource Centre contains over 55,000 journal issues. The library services faculty and students of Eastern College Australia and Melbourne School of Theology as well as members of the public who take out an individual membership. . ------ High-profile cases of light board Some of the higher profile cases he worked on while at the Institute for Public Representation included representing groups who challenged various aspects of the Intercounty Connector, groups who challenged the development of a wind farm in a corridor used by protected migratory birds, and groups seeking environmental restoration of Poplar Point, a portion of the Anacostia National Park, among other projects ------ Death and legacy of light board Purnell died in 1902 and was buried in the cemetery of historic St. Anne's Church close to Maryland's statehouse in Annapolis, Maryland. In addition to the historical markers erected on battlefields to honor Purnell's legion, in 1972, the University of Delaware dedicated a building in his honor, specifically recognizing his efforts to educate women. . ------ Highlights of light board Won best college award from Madurai Kamaraj University for the five consecutive years 19992004 Established: 1964 Status: Tamil Nadu State Government Aided College affiliated with the Madurai Kamaraj University ManagementÂ: Tamilnadu Wakf Board M.S.S. Wakf Board College is the only college in India being run by a state Wakf Board ------ Federal judicial service of light board Overton was nominated to the United States District Court for the Eastern District of Arkansas by President Jimmy Carter on March 7, 1979, to a new seat created by 92 Stat. 1629. He was confirmed by the United States Senate on May 10, 1979, and received his commission on May 11, 1979. Overton continued to serve on that court until his death of cancer on July 14, 1987 at his home. . ------ Transportation of light board Avian Java, a British hang glider HMS Java, three ships of the British Royal Navy Java (1813 ship), British merchant and migrant ship USS Java (1815), a 44-gun frigate in the United States Navy SS Java, a British and French ocean liner built in 1865 Java-class cruiser, a class of Dutch World War II light cruisers Bentley Java, a 1994 concept car Chrysler Java, a 1999 concept car ------ Transcendental Meditation of light board Davis was a practitioner of Transcendental Meditation and advocated its use to reduce the stress of soldiers. He was also a founding member of the Board of Trustees at Maharishi International University (MIU) (now called Maharishi University of Management). At MIU, General Davis was also an International Resource Faculty member for the United States in Military Science. . ------ Rankings of light board The school has produced toppers in CBSE 10th and 12th standard exams as well as the AIEEE, BITSAT and IITJEE exams year after year. Education World magazine ranked the school first in academic reputation (along with DPS Delhi) and over all fourth in the country in the year 2010.It has also been ranked as 8th in all over India schools ------ John Forrest Tavern of light board John Forrest Wildflower Tavern and Restaurant was opened in 1978. It is centrally located within the park just uphill from the ranger's office. It has become a landmark for events such as car club rallies and orienteering clubs. The outside court yard has become a popular tourist attraction as native birds and kangaroos, seeking food, approach close to the building. ------ Climate of light board Nelson Bay has a maritime-influenced humid subtropical climate (Cfa) with warm humid summers, damp autumns, cool wet winters and relatively dry springs. The suburb is relatively sunny, receiving 117.8 clear days annually. Despite the high amount of rainfall throughout the year, the rain days are relatively few, barely reaching over 10 days per month. ------ Discography of light board Solo albumsMorgan (1971) US only release Call (1997) Dave Morgan Music Long Way Home (1999) Scottmorgan Music Reel 2 (2001) Scottmorgan Music Across the Divide (2012) Grimm Doo Records Bubbles (2017) (as Morganisation) promotional copy only Highland E.P. (2018) (as Morganisation) Grimm Doo Records Seven (2019) (as Morganisation) Grimm Doo Records Bubbles 2 (2019) (as Morganisation) Grimm Doo Records ------ Academic and literary career of light board Prothero was a Fellow of All Souls' College, Oxford between 1875 and 1891, during which time he played first-class cricket with Hampshire, and was also Proctor between 1883 and 1884. He edited the Quarterly Review between 1893 and 1899. From 1898 to 1918, he was chief agent for the 11th Duke of Bedford. . ------ Bibliography of light board Brooks was the author of: Mysteries (1924) The Prayer that Never Fails Short Lessons in Divine Science What is Real and What Illusion? The Training of Children: Based upon the Practical Principles of Life Studies of Health The Kingdom of Law.Several of her sermons were collected in Into the Light of Healing. ------ Employment of light board According to University of Miami's official 2017 ABA-required disclosures, 75% of the Class of 2017 obtained full-time, long-term, JD-required employment nine months after graduation. University of Miami's Law School Transparency under-employment score is 13.8%, indicating the percentage of the Class of 2017 unemployed, pursuing an additional degree, or working in a non-professional, short-term, or part-time job nine months after graduation. . ------ Protected area status of light board Cape du Couedic is currently located within the protected area known as the Flinders Chase National Park. As of 2012, the waters surrounding its shores are part of a combined restricted access and sanctuary zone located within the boundaries of the Western Kangaroo Island Marine Park. ------ Organization of light board The Hurricane Hunters belong to the Aircraft Operations Center (AOC), located at Lakeland Linder International Airport in Lakeland, Florida, United States. The Aircraft Operations Center is under the Office of Marine and Aviation Operations (OMAO), which is a branch of the NOAA, which is in turn an agency of the Department of Commerce. The AOC resided at MacDill AFB from January 1993 to June 2017. . ------ Candidates of light board Dorothy A. Brown, Cook County Clerk Richard M. Daley, incumbent mayor William "Dock" Walls III, former aide to Harold WashingtonNominations invalidThe following candidates had their nominations deemed invalid by the Chicago Board of Elections, and thus were denied inclusion on the ballot: Thomas O'Brien Ziff Anthony Sistrunk Syron S. Smith, community activistDeclinedLuis Gutierrez, congressman Jesse Jackson Jr., congressman ------ Honors of light board He has received honorary degrees from the General Theological Seminary, Seabury-Western Theological Seminary, Nashotah House, Sewanee, Rikkyo University and Berkeley Divinity School, the Virginia Theological Seminary, Seminary of the Southwest and Episcopal Divinity School. He was also made an Associate Sub Prelate of the Most Venerable Order of the Hospital of Saint John of Jerusalem by Queen Elizabeth II in 1997. ------ Popular culture of light board Barca appears in the fantasy fiction book Mortals & Deities - Book Two of the Genesis of Oblivion Saga by Maxwell Alexander Drake. In Drake's fantasy world it is described as an ancient game with the same name and rules as Barca, but with animal pieces from that world: Krugours, Niyoka and Drakons for mouse, lion and elephant (respectively). ------ Company offices of light board From 1872, the South Australian Company occupied offices on North Terrace on the corner of Gawler Place. The new building, "Gawler Chambers", was completed in 1914. First office, erected 1836 at Kingscote, Kangaroo Island. (c. 1870) North Terrace east, corner of Gawler Place. (c. 1872) c. 1900 c. 1909 "Gawler Chambers" c. 1914 c. 1914 ------ Cricket career of light board Prothero played six first-class cricket matches between 18721883. Twice for a Gentleman of England team against Oxford University and in four matches for Hampshire. Prothero played for Hampshire between 18751883 before retiring from first-class cricket. Prothero's high score of 110 came for the Gentleman of England against Oxford University on 4 June 1879
How to Choose the Noise on the Metal Furniture?
How to Choose the Noise on the Metal Furniture?
The ocean is pitch-black 3000 feet and down. Navy subs operate above that. Unless they operate on the surface, they do not navigate by sight anyway. It's a big ocean, they just hope they do not bump into anything. They also have good passive sonar, anything that makes noise ahead of them, they will know about it1. I'm buying a new Printer, which one should I choose?Hi! I can tell you that I've always had good luck with Lexmark, they are versatile and I have not had one that broke down on me to date. Unfortunately, I can not say the same about the HP 2050. It is a piece of junk. It runs through ink pretty fast, despite draft settings, does not recognize that there is (indeed!) paper in the tray, and sometimes turns itself on or off, or just makes noise for no apparent reason. I think the print quality overall is substandard, and I wish I could take the thing back. I though I was getting a deal. Now I am struggling to get it to print 4X6 photos, and it's printing very skewed sometimes, other times it prints with a 3/4" white margin on the page. Come on, I've been doing this for 10 years. I have to hover over it constantly jamming the paper down it because just setting it in (as one would normally do with any other printer) will not be recognized by the machine, and then, it might not even catch the paper and continue the feed down into the machine. Oh! Please, if I can spare you a fraction of the headache caused by the HP 2050, let it be so! I should have gone with the Lexmark--gave mine to my mother, she loves it of course, but it was an older (2yrs ago) model. Good luck!2. How It Works: Active Noise ControlUnless it's a flat-out and gnarly sports car, most people like their vehicles quiet inside. Bank-vault quiet has long been associated with luxury, and mainstream automakers are now trying to turn down noise to make their vehicles feel more upscale, too. Automakers put sound-deadening barriers in their vehicles, including in the floor and cowl, but even with modern lightweight materials, they can only add so much. Piling it in more adds weight, and that in turn affects fuel consumption. Many companies are now also using an electronic method, active noise control (ANC), which cancels out the noise rather than just muffling it. ANC becomes even more important as car companies adopt fuel-saving engine technologies. Engines with cylinder deactivation can generate unpleasant, low-frequency noise when they are running on three or four cylinders, as can engines running at lower revolutions when their multi-speed transmissions move into their higher gears as quickly as possible to save fuel. This is in addition to the sounds created in all vehicles, including road noise from tires and suspension vibration, and wind noise. The technology works on the same principle as noise-cancelling headphones. Microphones in the vehicle's cabin pick up sounds and relay them to the system's computer, which determines the sound waves. Then, for each wave of unwanted noise, it comes up with a wave that's completely the opposite. It issues it as a sound out of the stereo speakers, whether the stereo's on or not. Known as "destructive interference," it's virtually imperceptible to the occupants, but it's enough to cancel out the problem. The peak-and-valley air pressure waves of the ANC sound, 180 degrees opposite to the high and low waves from the engine or road noise, essentially combine both sets of waves into an almost flat line, and very little - if any - of the unwanted noise reaches the occupants' ears. There are numerous ways to quiet a vehicle's cabin, beyond just adding sound-deadening material. Acoustic glass can be used in the windshield and side windows. All windshields are made of two pieces of glass with vinyl sandwiched in between, to keep it together if it breaks. While that helps to cut down noise on its own, acoustic glass has an extra layer of noise-reducing vinyl. An acoustic windshield can make a considerable difference in cabin noise, but it is pricier than a regular one. Automakers also add seam sealant between body panels for noise reduction as well as for waterproofing, and may use hydraulic body mounts to reduce vibration. Hyundai recently announced a new spin on existing ANC technology, which it calls Road Noise Active Noise Control, or RANC. The company says RANC can make a vehicle even quieter because it overcomes the limitations of active noise control - namely, that ANC only works when the unwanted noise is constant and predictable, such as that produced when an engine is running. Road noise, on the other hand, can be erratic and take just a split-second to make its presence known to occupants, and ANC can not react quickly enough. In addition to interior microphones and sensors used for ANC, the RANC system also uses an acceleration sensor to calculate vibration from the road and sends it to a control computer for analysis. The signal speed and calculation are very fast, taking 0.002 seconds to analyze the noise and then send an inverted soundwave through the stereo speakers to counteract it. Hyundai says it takes about 0.009 seconds for road noise to reach the vehicle's occupants otherwise, so the sound waves would be flatlined before anyone could hear them. In tests, RANC reduced noise in the cabin by three decibels, roughly half the noise of a car without it. It has the potential to reduce the amount of sound-deadening material needed in vehicles, which in turn reduces overall weight. The system also seems custom-made for electric vehicles, where road and wind noise can be even more noticeable to occupants since there's no engine noise alongside. But while a quiet interior might give a vehicle a premium feel, not all cars are meant to be silent, and that can be an issue in a performance car. It's not the same if you can not hear the engine growl, and that might not come through loud and clear if the cabin's been insulated and its noise-controlled. To get around this, some automakers play a different type of music through the stereo's speakers: a recording of the engine, cued up so the sound matches what the real engine's actually doing. Drivers will still hear what is under the hood, but the recording beefs up the sound. Much of a performance car's rumble is the exhaust note, and some include a switch that opens a valve for a louder and sportier sound. But when it's too much, Ford includes "Quiet Time" mode on its Mustang GT, which lets you cut the exhaust noise when starting or driving. Apparently one of Mustang's engineers annoyed his neighbour with his loud exhaust first thing in the morning. The neighbour called the cops, and that prompted the invention of this ultimate in noise cancellation.3. Noise ViolationThanks for the link man. I will definitely be using that bit of information in court. I went by the administration office today for the zoning maps and they confirm my findings. The area is commercial.
During the Spring Festival Transportation, the Accuracy of Black Technology for Large-scale Face Rec
"Nian" is an essential holiday for Chinese people. During this holiday, it is not only the yearning of tourists for their hometown, but also a time for family reunion. However, for government departments, ensuring the safety of tourists is the first priority, and at this moment, "black technology" is the first technology to ensure everyone's safe return home.We are now making an inventory of black technology during the Spring Festival transportation!Face recognitionFace recognition has been applied for several years, and its accuracy is gradually rising. Especially with the application of deep learning, the accuracy of face recognition can reach 99.9%.However, face recognition is not available everywhere. Due to the problems of angle and cost, most face recognition systems adopt the back-end deployment mode, followed by the access control. Through the face recognition system, users can brush their faces and enter the station to improve efficiency. For public security users, the face recognition system can effectively identify the suspects in the crowd.But at the same time, masks and other obstructions must be removed when passing through face recognition equipment.robotIf you see a robot coming to you, please don't be surprised and don't "tease" it at will, because it is not only a service, but also a supplement to the public security force.In the environment of huge passenger flow, how to better serve people? Robots have become one of the solutions. At present, robots can effectively provide guidance services, alarm and other services for customers, and can provide 7 * 24-hour services to better serve users.VR navigationDue to problems such as station design, not all tourists can understand the construction of the station at the first time. If they get lost in the station, VR navigation becomes the best solution for passengers eager to get on the train.Recently, Nanchang Railway Bureau launched VR (virtual) panoramic navigation at key stations under its management, such as Nanchang west station, Fuzhou Station and Xiamen station. Hankou and Wuhan railway stations in Hubei also provide 360 degree panoramic navigation function in VR stations for the first time on official microblog and wechat. Through VR navigation, the user can start planning the inbound route before entering the station and successfully board the way home.UAVIn addition to trains, planes and other means of transportation, the Spring Festival transportation army also has cars, motorcycles and other road means of transportation. For such tourists, relying solely on traffic police and road monitoring can not observe the whole road section in real time and effectively, and road monitoring can not be completed within a period of time. UAV has become a means of compensation.The current UAV can observe the traffic flow in the air for a long time and a long distance, especially the UAV Based on intelligent video analysis, which can not only timely and effectively count the traffic flow, but also identify the suspected vehicles and personnel. At the same time, if there is a problem with road traffic, the UAV can rush to the scene and obtain evidence at the first time.Big data statisticsIn addition to hardware, there are also a large number of software to provide effective technical support for returning users, such as big data statistics.Through big data statistics, local traffic data can be placed in front of managers in real time. Where there are too many people and what problems lead to it. Through big data, managers can effectively know the regional environment, so as to make next decisions and avoid accidents.5GAlthough 5g has not been commercialized, it has been tested and applied in Hangzhou railway station. Due to the characteristics of high frequency and high data transmission, 5g can provide faster and convenient services for end users, so that each terminal equipment in the station can feed back various data more quickly and provide convenience for users."Black technology" helps Spring Festival TransportationIn addition to various software equipment, the equipment of public security policemen has also been updated in a timely and effective manner. Identity inquiry equipment, portable face recognition camera, button camera, GPS positioning and other equipment also enable the public security police to provide better and more comprehensive services during patrol.However, during the Spring Festival transportation, these "black technologies" are not the only ones. More technologies are applied to aircraft, trains, cars and other means of transportation, so as to provide a safer environment for people to return home.
How to Measure the Maximum Weight That a DC Motor Can Move?
"The salesman told me ..." LOL! If physics was his thing, he'd probably not be a salesman. In any case his job is to make a sale, whether you get your device working or not.The first thing you need to decide is how much power the motor needs to have. You can then worry about torque and speed later. Those can be traded off against each other, but you can't cheat the physics that requires a certain power for certain tasks.There are two end-user criteria you need to look at to decide the power. These are how fast you want to be able to accelerate, and what minimum speed you want to be able to go up a decent hill. I'll use the hill criterion as example.Let's say you want to be able to go 20 MPH up a 20% grade. 20% grade means you go up 1 part for every 5 forward. Since the only physics work being done is going up, the problem reduces to raising 350 kg straight up at 4 MPH. 4 MPH is 1.8 m/s, and here on earth 350 kg weighs 3.43 kN. The power expended is therefore:(1.8 m/s)(3.43 kN) 6.13 kWOf course there will be some friction to overcome, so you'd want about 10 kW in this example. Since 500 W isn't even close, you either have to specify much lower performance or get a much bigger motor (and the power source to feed it).Let's flip this around and see what 500 W can do.(500 W)/(3.43 kN) 146 mm/sThat's how fast 500 W can lift the whole unit straight up. Applying that to a 20% grade, for example, it can move along at 5x that, or 730 mm/s, or 1.63 MPH. In reality there will be friction and other losses, so probably not more than 500 mm/s 1.1 MPH.You should start with power as described above. Once you have decided how much power the motor must put out, you face the torque/speed tradeoff. You can figure out what torque/speed you need at the wheels, but that will usually be much too slow and too high torque for a reasonable electric motor to produce directly. As a result, there will be some gearing between the wheel shaft and the motor shaft. Since gearing is in there anyway, pick a good motor and then design the gear ratio accordingly, not the other way around.To put this in perspective, let's look at the torque and speed required go up a 20% grade at 20 MPH as described above. Let's say the wheels are 500 mm in diameter, so 250 mm radius, so 1.57 m circumference. 20 MPH is 8.9 m/s, so the wheel must turn at 5.7 Hz. Your not likely to get a suitable motor with peak power and efficiency at 5.7 Hz (342 RPM). You'll probably end up with a 5x to 10x gear ratio, depending on the best available motor you find.For example, let's say you've decided you need a 10 kW motor. That could come as 60 Hz (3600 RPM) and 26.5 Nm, 20 Hz and 80 Nm, or a variety of other combinations that all result in 10 kW. Suitable motors will only be available in limited combination, and the gearing will likely be custom designed anyway. Pick the motor, then let it dictate the gear ratio.We are working on a computer-controlled electric vehicle project which is based on an ATV chasis.While I was looking for a DC motor to move this vehicle (which is estimated to be 350kg), I found an electric wheelchair motor. It is 500 W 108 rpm 24V DC motor and has its own differential. The salesman told me that it can move up to 540 kg. I don't know which fact this number is based on.I also have a 500 W 1500 rpm 24 V DC motor. If I decrease rpm and increase torque with the same ratio of electric wheelchair motor via reductors, can it move up to 540 kg? Or does the max weight that a motor can move depend on another factors? How can I measure this?Thanks in advance.·OTHER ANSWER:We are working on a computer-controlled electric vehicle project which is based on an ATV chasis.While I was looking for a DC motor to move this vehicle (which is estimated to be 350kg), I found an electric wheelchair motor. It is 500 W 108 rpm 24V DC motor and has its own differential. The salesman told me that it can move up to 540 kg. I don't know which fact this number is based on.I also have a 500 W 1500 rpm 24 V DC motor. If I decrease rpm and increase torque with the same ratio of electric wheelchair motor via reductors, can it move up to 540 kg? Or does the max weight that a motor can move depend on another factors? How can I measure this?Thanks in advance.
Hello! I Wanted to Know the Difference Between the Noise of a Bad Wheel Bearing and Bad Brakes.?
You need to run from those folks. They are gyp artists and they really got your number. Go to an honest shop. The "free" inspection is not really free, is it? They will be happy to take your money for a whole new brake system that you do not need if the problem is a noisy wheel bearing. The caliper is not broken and fused. Bet on that. Those are some scary expressions, are not they? You did not bring the car in on a tow truck, which you would have with all the things wrong they say. I had a shop like that tell me I needed a new battery. I bought tires and wheel alignment that I knew I needed because that's all I went there for, but not a battery. They did loosen one battery cable so it would be troublesome later on when the weather turned. I cleaned and tightened the cable. I know how much to trust shops telling me my non problem is going to be a failure.1. Why do women mistake wide child-bearing hips with being fat?A lot of mothers are smaller than women who have never had children2. Is it possible that two different accounts in the same bank and branch have checkbooks bearing the same number?It is impossible for two checking accounts in the same bank to bear the same account number. You can have a box of replacement checks, one pad of which someone else has gotten their hands on and used, if that's what you are referring to.Examine the check number of the one that you believe was used fraudulently, and compare it with check pads you still have in your possession. Odds are, you will be missing the pad that contains that check number3. How can I kill thistle weeds around fruit bearing bushes?Cut it down just after the flowers start to open. Pulling or cutting thistle at this point kills the plant and the root. Pulling it at any other time without digging up the root system will allow the thistle to spread via the roots. Do not let the flowers to get pollinated as that means they will form seed, even on a dead plant and than you will get more thistle. I have used this technique for years and it works well for me. I just wish my neighbors would control their thistle so I did not keep getting new populations on my farm.4. 1998 volvo needs wheel bearing, suspension, tie rod, it costs a lot to repair; should I let it go?Get the wheel bearings, tie rods and calipers for now. The rest of it is not safety critical, but if you neglect the wheel bearings, your wheel may fall completely off! I do not know how sturdy Volvo's tie-rods are, I've been driving for 60,000 miles on some shot tie-rods on a 1985 F150, but just the same I want to replace those. I also had wheel bearings go out on this vehicle, it ate front tires alive and absolutely slaughtered brake parts. Glad I got those fixed. Learn how to DIY, as well, you will save a ton of money on repairs. Cars are not as hard to work on as they look.5. If a woman of child bearing age lost her uterus, can she deliver a baby in an ectopic pregnancy?No - you would not deliver a BABY - it would be a fetus - it could never grow to a survivable weight or size6. Hey, mother, I come bearing a gift. I'll give you a hint. It's in my diaper and it's not a toaster.definitely talk to her! if you do not you will regret it for the rest of your life! and who knows, maybe you two could end up a couple7. Does the right against self incrimination have any bearing on FOIA requests?With a FOIA requuest, you do not ask a government official, you ask a government agency. A government agency is not protected by the 5th amendment. In practice, the response to a request is not provided by an agency, but by an employee of that agency. That employee should respond based on the knowledge of the agency. If the employee has any private knowledge, that would not become part of the response. That applies if the employee has private knowledge of a crime. If that crime was committed by someone else, it might have been illegal not to report the crime, but that is independent of the FOIA request. Now let's say the agency has knowledge of a crime that "the agency" committed. (In reality I would assume some member of the agency did). Since an agency is not protected by the 5th amendment, it has to be part of the response. Now let's say the agency has knowledge of a crime that the employee writing the response committed. That's when self incrimination comes into play. I do not think 5th amendment allows you to lie, including lying by omission. So quite possibly that employee can say "I am not going to write the response to the FOIA request". In that case, the next employee would have to write the response, and that employee would not be incriminating himself. Now if all employees committed a crime together, then they might all be able to refuse to write the reply, but the agency still has to respond, so they might have to request outside help :-)
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