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How to calculate the pitch and pitch of gear pitch?
- Formula for calculating the center distance of gears:1 、 spur gearA= (d1+d2) /2= (Z1+Z2) *M/22 、 helical gearA= (d1+d2), /2= (Z1+Z2), *Mt/2= (Z1+Z2), *Mn/2*cos betas
Why is wool better than bubble wrap in insulation?
- Heat moves by conduction, radiation and convection Bubble wrap conducts heat at the plastic surface and then there is only a single layer of air for the heat to traverseAnd actually between the bubbles the plastic is solid and has no air for in insulationPlastic conducts heat faster than airOnce the air in the bubble is heated by conduction from the plastic, the heated air moves by convection to the top layer of plastic wrap and warms up the top layerSo the bubble wrap has plastic for a conductor which conducts heat fairly well compared to wool and it only has one air layer separating it from the other side along with solid sections around the air bubbles Wool on the other hand is long fibers that don't conduct heat very well to begin withThen the heat that does get conducted into the wool fibers has to jump hundreds of micro air layers between the wool fibers Convection heat transfer is much slower heat transfer than conductionSo the wool conducts heat , then has to convect heat across the fibers then reheat the next fiber by conduction and then reconvert to convection again and on and on So to put it simply wool has slower conduction than plastic and has many more microscopic air layers between the fibers to further slow conduction and put many convected layers of air to traverse for the heat path thru the wools
How much is aluminum section ton?
- Aluminum prices are generally aluminum ingot + processing feesAluminum ingot to see whether you use LME or the South China Sea well-informed, or with the Yangtze River aluminum ingot prices?. Aluminum ingots generally float between 16000/ tons.Processing costs, the blank is generally 2500-3000/ tons, ordinary oxidation plus 1000 can be. If sprayed, add 500 on the basis of oxidation.s
What are the equipment and names of the operating room?
- Equipment cabinet, medicine cabinet, anesthesia cabinet, writing desk, anesthesia clock, hanging tower, shadowless lamps
What is the working principle of the circuit board?
- the circuit board to make the circuit mini, visualization, for the fixed circuit production and optimization of electrical appliances play an important role in the layout. The circuit board can be called printed circuit board or printed circuit board, the English name is (Printed Circuit Board) PCB.s
Is the heat conductor material of the hair straightener good for environmental protection alloy or ceramic?
- At present, the layout of the straightener is made of ceramic aluminum alloy, nano titanium ceramic and microcrystalline glass. Except for the aluminium alloy, the other ones are all good, and they also hurt the hair a little bits
What is the principle of electronic dog work? What is the principle of radar speed ah?
- Car electronic dog works is to rely on the installation of electronic dog in the car detection radar tachometer, electronic dogs can detect a certain distance around the radar gun, when the car near the radar gun, the electronic dog will issue a warning. In fact, the electronic dog is mainly the use of satellite positioning and radar detection and other high-tech means for mobile speed devices to prompt, as well as fixed red light to take pictures of electronic eyes in advance broadcast, guide the owners safe and comfortable driving. Can also have a fixed speed and mobile speed function of the electronic dog (such as the Guangzhou Shanxing agent of the United States Cobra electronic dog), is the real electronic dog.s
What is the earliest textile raw material?
- The ancient Roman Empire was first through the "Silk Road" on the spread of silk, said China as "silk country"s