Diamond is originally an electrical insulator with extremely high hardness and thermal conductivity better than copper. These excellent properties are due to its special structure and covalent bonds. If other elements are incorporated into the diamond as carriers, it becomes an electrical conductor. A boron atom has one electron less than a carbon atom, and can generate an effective hole in the diamond to become a charge acceptor. The acceptor level generated by the hole introduced by the boron atom is located at the top of the valence band of the diamond, and the distance from the conduction band is about 5.5. Electronic volts. Compared with other potential doping elements, boron has a small atomic radius, is easy to enter the diamond lattice, and is easy to obtain a higher doping concentration. Electron conduction studies of boron-doped diamonds have shown that when the boron atom concentration is n ≈ 1017 to 1019 / cm 3 , an activation energy of about 0.35 electron volts is generated. As the boron concentration increases, the activation energy will gradually decrease. When n≥1020/cm3, the boron-doped diamond exhibits metalloid behavior, and the value 1020 is called the insulator-metal transition concentration.
Scientists reacted B4C and graphite at high temperature (2500 ~ 2800K) and high pressure (about 1010Pa) to obtain polycrystalline clusters with a metal-like luster diameter of 1-2 mm. The diameter of the boron-doped diamond grains was only a few. Micron, and physical properties such as resistivity, magnetic permeability, specific heat, etc. indicate that boron-doped diamond belongs to type II superconductor and exhibits superconducting properties below the superconducting transition temperature Tc ≈ 4K. The discovery of the superconducting properties of carbon in diamond-type structures suggests that scientists, silicon and germanium with the same structure may also produce superconductivity under suitable conditions.
Our automatic door kits include 1 motor+gear reducer, 1 belt,7 meter, 1 idle pulley, Microprocessor, 4 sets of carriage blue wheels, 2 sets of floor guides,2pcs remote control, 2 sets belt clamp mounting brackets, 1 power supply harness and cable connectors, 2 locator, Aluminum track whose length is 2.08 meter, 3 meter, or 4 meter.
We are a manufacturer of automatic door openers that are designed to provide people convenience. Automatic Door Systems` drive to provide that level of service is but one of the reasons why automatic doors are becoming more and more popular. Our Automatic Sliding Door systems are modern, space-saving and elegant.
Automatic sliding doors have many basic functions some of which include: automatic mode with full opening width and/or reduced opening width, and exit only for traffic control. The opening of automatic doors can also be adjustable to make the opening width smaller or larger. Important safety functions such as safety sensors prevent the door from shutting if persons or objects are in the detection zone. If the door leaves are inhibited when closing, they are immediately re-opened or if the door leaves are hindered when opening, they are immediately stopped by a safety automatic reversing mechanism.
Our most popular sliding automatic door. Think of this as the go-to door for everyday automation needs. All components fully tested and pre-assembled at factory for fast, trouble-free installation.
Applications: Retail, healthcare, airports, hospitality, clean rooms. Shenzhen Hongfa Automatic Door Co.,Ltd rated door is designed, test and certified to meet your environment needs. automatic slide doors for industrial, commercial, healthcare, and retail use. You will find our automatic sliding doors throughout in a wide variety of locations, including: Hospitals, Airports, Retail centers, Pharmacies, Hotels, Grocery stores, Hardware stores, Sporting goods stores, and more.
Automatic Sliding Doors can either be a single door sliding in one direction or bi-parting doors where each door leaf slides in the opposite direction. They are often used in grocery stores, entrances to shopping malls, hospitals and other applications where you want to provide your customers a hands free, safe and easy access to your building.In addition, one of the biggest benefits of automatic doors is energy savings. Since these doors only open when someone comes in or out of your building, it prevents the loss of energy when a door may otherwise be left open for a long time.
The control device of sliding automatic door contains basic function and extensional function, automatic operation / hold-open/closed/half-open to meet customer needs. Electric sliding door controller has multiple interfaces for complete access control systems for keeping your life and property more safety. Such as: safety beam photocell, electric locks, sensor etc. Its drive devices adopts European technology to integrate motor with gear box, which offers strong driving and reliable operation and increased power output , it can adapt to a large door.
Providing strength, beauty, and technology all in one package, Hongfa's line of automatic sliding doors provides entrance solutions for practically any application. An exclusive feature is Hongfa's sound-dampening track reducing operational noise to a mere whisper and stops vibration resonance that can be transferred to the building structures.
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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfrollershutterdoor.com