Contact resistances

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  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: A novel method for crystalline silicon solar cells with low contact resistance and antireflection coating by an oxidized Mg layer

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  • Heat transfer has emerged as a central discipline in contemporary engineering science. The research activity of a few decades ago—the material reviewed in the first handbooks—has distilled itself into textbook concepts and results. Heat transfer has become not only a self-standing discipline in the current literature and engineering curricula, but also an indispensable discipline at the interface with other pivotal and older disciplines.

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  • The Chemistry of Silver Copper, silver, and gold form group 1B of the periodic table, and together they are known as the ‘coinage metals’. Silver, like gold and the six platinum group metals (platinum, palladium, rhodium, ruthenium, iridium, and osmium), is a noble metal. Silver has the highest electrical conductivity and the highest thermal conductivity of any metal, as well as the lowest electrical contact resistance (Table 1).

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  • Electrical resistivity (also known as resistivity, specific electrical resistance, or volume resistivity) quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m)[1][2][3] although other units like ohm⋅centimetre (Ω⋅cm) are also in use.

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  • Hospitals, by their very nature, are dangerous places. Sick and infected patients are clustered together in one institution, often in close proximity to those who are immunosuppressed due to recent surgery, chemotherapy or transplantation. Contact between these various patient groups is easily achieved via the hands of healthcare workers (HCWs), use of shared equipment or the hospital’s air handling system.

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  • Petroleum contaminant decomposition and in-situ destruction may be accomplished using chemical oxidation technologies. In contrast to other remedial technologies, contaminant reduction can be seen in short time frames (e.g., weeks or months). As discussed in this chapter, a variety of chemical oxidants and application techniques can be used to bring oxidizing materials into contact with subsurface contaminants to remediate the contamination.

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  • ELECTRICAL Contact Resistance: 0.020 Ohm maximum (initial) 0.020 Ohm maximum (after life cycling) 0.10 Ohm maximum (after salt spray) Insulation Resistance: 10,000 megohms minimum (initial) 1,000 megohms minimum (after moisture resistance test) Dielectric Withstanding: Voltage: 500 Vac Contact Rating: Maximum: 100 mA + 130 Vdc; Minimum: -40 dBm MECHANICAL Mechanical Shock: Per MIL-STD-202F, Method 213B, test condition H Vibration: MIL-STD-1344, Method 2005, test condition I Insertion Force: 7 lbs. (3.17 kg) maximum Withdrawal Force: 1.5 lbs. (.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về ngành y học đề tài: Evaluation of rapid screening and pre-emptive contact isolation for detecting and controlling methicillin-resistant Staphylococcus aureus in critical care: an interventional cohort study...

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  • this is a promising time to be working on ensuring the care of mothers and newborns. the global health community has at its disposal a range of cost-effective, proven solutions that can halt the majority of conditions causing maternal and neonatal deaths. 1, 2, 3, 4 these include antibiotics for infections, sterile blades to cut umbilical cords, misoprostol and oxytocin for preventing and treating postpartum hemorrhage, and teaching mothers the importance of immediate, exclusive breastfeeding and skin-to-skin contact to keep their babies warm.

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  • When theaand bchains were separated from human oxyhemoglobin (HbO2), each individual chain was oxidized easily to the ferric form, their rates being almost the same with a very strong acid-catalysis. In the HbO2tetramer, on theother hand, bothchains become considerably resistant to autoxidation over a wide range of pH values (pH 5±11).

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  • It is well known that no surface, natural or manufactured, is perfectly smooth. Nonetheless the idealized case of elastic bodies with smooth surfaces is considered in this chapter as the theoretical reference for the contact between rough surfaces. The latter will be discussed in Chapter 4 and used as the basis for evaluating the frictional resistance.

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  • Metal cutting puts extreme demands on the tool and tool material through conditions of high forces, high contact pressures, high temperatures, and intense chemical attack by difficult to cut work materials. In addition, the tool geometry and cutting conditions in terms of sharp edges, cyclic engagement and presence of cutting fluid will add to the severity. Most often cutting tools are used close to their ultimate resistance against these loads, especially to the limiting thermal and mechanical stresses. ...

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  • Whenever relative movement takes place between two surfaces in contact, there will be resistance to movement. This resistance is called the frictional force, or simply friction. Where this situation exists, it is often desirable to reduce, control, or modify the friction. Broadly speaking, any process by which the friction in a moving contact is reduced may

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  • CHAPTER 25 LUBRICATION A. R. Lansdown, M.Sc., Ph.D. Director, Swansea Tribology Centre University College of Swansea Swansea, United Kingdom 25.1 FUNCTIONS AND TYPES OF LUBRICANT / 25.1 25.2 SELECTION OF LUBRICANT TYPE / 25.2 25.3 LIQUID LUBRICANTS: PRINCIPLES AND REQUIREMENTS / 25.3 25.4 LUBRICANT VISCOSITY / 25.6 25.5 BOUNDARY LUBRICATION / 25.9 25.6 DETERIORATION PROBLEMS /25.12 25.7 SELECTING THE OIL TYPE /25.14 25.8 LUBRICATING GREASES /25.17 25.9 SOLID LUBRICANTS / 25.22 25.10 GAS LUBRICATION / 25.26 25.11 LUBRICANT FEED SYSTEMS / 25.26 25.12 LUBRICANT STORAGE / 25.

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  • While such investigations yield differing effects dependent on the situation, the common observation of a temperature change has been associated with the presence of mechanical energy, which is required to overcome frictional resistance as sliding at the contact interface occurs. The energy, dissipated through conversion into thermal energy, is manifested as a temperature rise. At the microlevel, this increase can be substantial. A localized change in material properties, an enhancement in chemical reactivity, and ultimately, failure of the mechanical system can result.

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  • ADC LSA-PLUS® connection systems include connection, disconnection and switching modules for eight or ten pairs, all featuring the patented LSA-PLUS interconnection displacement connection (IDC) technology. LSA-PLUS connection systems support connection, line splitting, switching and earthing of connections in telecommunication and data networks. The contact is resistant to climatic and other environmental problems. Technical contact security results in the formation of a gas-tight connection with very low transmission resistance.

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  • The seat or seal rings provide the seating surface for the disk. In some designs, the body is machined to serve as the seating surface and seal rings are not used. In other designs, forged seal rings are threaded or welded to the body to provide the seating surface. To improve the wear-resistance of the seal rings, the surface is often hard-faced by welding and then machining the contact surface of the seal ring. A fine surface finish of the seating area is necessary for good sealing when the valve is closed.

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  • A machining manipulator is subject to mechanical interaction with the object being processed. The robot performs the task in constrained work space. In constrained tasks, one is concerned with not only the position of the robot end-point, but also the contact forces, which are desired to be accommodated rather than resisted. Therefore, interaction force needs to be considered in designing and controlling deburring tools.

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  • Some limitations are imposed by incompatibilities of barrier material with chemical agents. Chemical resistant gloves, suits, etc. are rated on the ability to prevent contact with special types of chemicals. This performance is usually rated in terms of "breakthrough times", that is how long it takes for a particular chemical to pass through a particular barrier material under test conditions. This kind of information should be obtained from manufacturers (or from other reputable sources of technical information such as NIOSH, OSHA, etc.

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  • A gate valve is a linear motion valve used to start or stop fluid flow; however, it does not regulate or throttle flow. The name gate is derived from the appearance of the disk in the flow stream. Figure 4 illustrates a gate valve. The disk of a gate valve is completely removed from the flow stream when the valve is fully open. This characteristic offers virtually no resistance to flow when the valve is open. Hence, there is little pressure drop across an open gate valve. When the valve is fully closed, a disk-to-seal ring contact surface exists for 360°, and good sealing is...

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