The Manufacturer

How is strong magnet useful?

Strong magnet is very useful. That is why there is a geopolitical tug of war going on between China and other countries over rare earth minerals used to make very strong magnet. China is the largest miner and processor of rare earths and has threatened to cut off export of these materials to other countries that make products with them. 

The torque of a permanent magnet motor is a function of the strength of the magnetic fields in it. You can either increase the strength of the magnets, increase the current in the windings, or both. To make a motor of a given size have the most torque with the least use of electricity you build it with the strongest possible magnets. Other devices like hard drive voice coil mechanisms (which position the heads on the platter) also benefit from stronger magnets so they can move faster with less power consumption.

Basically almost anything that uses a magnetic field from a permanent magnet to do work, generate electricity, or steer beams of particles (MRI machines, nuclear physics particle accelerators, etc.) can benefit from the strongest possible magnetic field from the smallest possible magnets. Hybrid and electric cars simply would not be even close to practical without rare earth magnets becuse the motors would be too big and use too much energy.

Strong magnets are in your Hard Drive, the optics steering hardware of every CD and DVD player in the world, your hybrid or electric car, and hundreds of other applications.

A non contact measurement of radiometric apertures with an optical microtopography sensor

In precision optical radiometry one of the accuracy limiting factors is the non contact measurement uncertainty for the area determination of the beam limiting apertures. A technique for measuring these areas very precisely has been developed. In order to avoid damaging the fragile edges of the apertures a noncontact method for their detection is applied. A focused laser beam is used to measure the height profile of the aperture near its edge with a high lateral resolution. The height profile observed makes it possible to calculate the mean diameter of the aperture with an uncertainty of 0.4 mu m (68.3% confidence limits). The experimental set-up and the non contact measurement technique are explained in detail. Representative results are shown and an estimation of the individual contributions to the uncertainty is given.

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What is Road Pavement Profilometer?

Road pavement profilometer (aka profilograph, as used in the famous 1958-1960 AASHO Road Test) uses a distance measuring laser (suspended approximately 30 cm from the pavement) in combination with an odometer and an inertial unit (normally an accelerometer to detect vehicle movement in the vertical plane) that establishes a moving reference plane to which the laser distances are integrated. The inertial compensation makes the profile data more or less independent of what speed the profilometer vehicle had during the measurements, with the assumption that the vehicle does not make large speed variations and the speed is kept above 25 km/h or 15 mph. The profilometer system collects data at normal highway speeds, sampling the surface elevations at intervals of 2–15 cm (1–6 in), and requires a high speed data acquisition system capable of obtaining measurements in the kilohertz range.

The data collected by a profilometer is used to calculate the International Roughness Index (IRI) which is expressed in units of inches/mile or mm/m. IRI values range from 0 (equivalent to driving on a plate of glass) upwards to several hundred in/mi (a very rough road). The IRI value is used for road management to monitor road safety and quality issues.

Many road profilers are also measuring the pavements cross slope, curvature, longitudinal gradient and rutting. Some profilers take digitalphotos or videos while profiling the road. Most profilers also record the position, using GPS technology. Another quite common measurement option is cracks. Some profilometer systems include a ground penetrating radar, used to record asphalt layer thickness.

Another type of profilometer is for measuring the surface texture of a road and how it relates to the coefficient of friction and thus to skid resistance. Pavement texture is divided into three categories; megatexture (roads), macrotexture, and microtexture. Microtexture cannot currently be measured directly, except in a laboratory. Megatexture is measured using a similar profiling method as when obtaining IRI values, while macrotexture is the measurement of the individual variations of the road within a small interval of a few centimeters. For example, a road which has gravel spread on top followed by an asphalt seal coat will have a high macrotexture, and a road built with concrete slabs will have low macrotexture. For this reason, concrete is often grooved or roughed up immediately after it is laid on the road bed to increase the friction between the tire and road.

Equipment to measure macrotexure currently consists of a distance measuring laser with an extremely small spot size (< 1 mm) and data acquisition systems capable of recording elevations spaced at a mm or less apart. The sample rate is generally over 32 kHz. Macrotexture data can be used to calculate the speed-depending part of the friction number between typical car tires and the road surface. The macrotexture also give information on the difference between dry and wet road friction. However, macrotexture cannot be used to calculate a relevant friction number, since also microtexture affects the friction.

Lateral friction and cross slope are the key reaction forces acting to keep a cornering vehicle in steady lateral position, while exposed to exciting forces from speed and curvature. Since friction is strongly dependent on macrotexture, and texture, cross slope as well as curvature can be measured with a road profiler, road profilers are very useful to identify improperly banked curves that are posing a great risk to motor vehicle accidents.

China CNC Router is a nice choice?

China CNC Router is famous all over the world, and its capacity and durability are always considered as reliable features. “Super Star “is one of the best brands. Our company is also one of the largest supplier in china. Our machine have been exported to Europe, United States, Middle East, and India. Craft and relief engraving machine, a type of China CNC Router, is one of the main products in our factory.

It can be used for 3D engraving, red wood engraving, and some complex engraving . We also offer OEM services to fulfill vatious demands from our customers. If you want to know more about us, please feel free to contact us any time.

Burners and Torches Supplier

Roburn Co., Ltd is a extremely-certified, Taiwan-based mostly provider and manufacturer of micro burner, gas tool. The supplier has been recognized as some of the skilled manufacturers in the family home equipment business since 1993. With each expertise and innovation, the supplier is confident of offering patrons with quality micro torch. As a properly-established supplier and manufacturer in Taiwan, Roburn Co., Ltd has a popularity for offering high quality butane torch. In addition to gasoline torch , the provider additionally gives its customers with associated merchandise, similar to gas soldering iron, soldering torch, and brulee torch. With each good management and superior expertise, the supplier has been acknowledged as one of the most reliable producers within the presents & premiums trade since 1993. Acknowledged as an established, Taiwan-based mostly provider and manufacturer within the presents & premiums industry, Roburn Co., Ltd has been offering its customers quality soldering torch, gas soldering iron, fuel tool, and blow torch since 1993. With each superior know-how and professionalism, the supplier is sure to meet each customer's demand.

Ethernet Transformer

Cetus International Ltd. presents you here with one of the featured products, the Ethernet Transformer. Recognized as an established, China-based supplier and manufacturer in the passive devices & mems industry, Cetus International Ltd. has been offering its customers quality ethernet transformer and ethernet adapter since 2003. With both advanced technology and professionalism, the supplier is sure to meet each customer's demand.

Provide RoHS compliant 10/100/1000 BASE-T SMD/DIP LAN MAGNETICS and custom design available. Low profile packages (2.15mm) for PCCARD and CARDBAUS application. Application files include Network Interface Card (NIC), PC motherboard, Set Top Box and etc.