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Packaging materials influence greatly on reliability and performance of electronics components. While, materials such as molding compound protect the package from the environment; different mechanical properties of materials will inevitably introduce stress to the package. In this study, materials' viscoelastic effect on packaging stress in a MEMS sensor was studied using finite element analysis after...
By the way of orthogonal test and keeps the War page as the study object, the paper studies different molding technological parameters which have different levels of impacts on light guide plate with diversity thickness. Moreover, numerical simulation is used, trying to discuss that technical parameters have influences on the light guide plate. The paper also points out that there may exists huge...
Magnetic refrigeration (MR) is a cooling technology based on the magnetocaloric effect (MCE). It has the potential to replace conventional refrigeration systems. Recent development in magnetic refrigeration technology has encouraged researchers all over the world to think about some new original systems. This paper aims to describe a new magnetic refrigeration structure based on a rotating bar shaped...
Deep cryogenic treatment (DCT) is a one time permanent process. In DCT, the material is slowly cooled down to the soaking temperature, is held at soaking temperature for a period time, and is heated back to room temperature. DCT process factors have their own effect on the mechanical properties of material. The paper studies the deep cryogenic treatment process of YT15 carbide inserts by orthogonal...
The software for modeling temperature fields and appropriate to them deformations in optical elements of powerful lasers is developed. Carried out theoretical and experimental researches of thermal deformations in mirrors of powerful lasers, are determined major factors, which influence size of thermal deformations, the optimization of resonator mirrors designs and conditions of their cooling is carried...
A thorough understanding of the mechanics of lead-free solder joint in a ball grid array (BGA) assembly under expected operating conditions is essential in developing reliable life prediction models. In this respect, accurate deformation response of Sn-4Ag-0.5Cu (SAC405) solder under varying temperature cycles and straining rates is established using unified inelastic strain theory. The mechanics...
Dielectric windows often limit the power handling capability of vacuum electron devices. It is necessary to choose the right dielectric material for high power applications. Depending upon the power level, a range of materials has been used in various systems. The ideal material should have high mechanical strength, high thermal conductivity, high electrical breakdown voltage, low dielectric loss,...
We measured, in the 873-1173 K temperature range, the temperature- and Cd vapor-pressure-dependences of the free electron density in single Cd1-xZnxTe≪In≫ (0 ≤ × ≤ 0.1) crystals with different In contents. Increasing the cooling rate of the crystals and/or decreasing the well-defined Cd vapor pressure reduced the free-electron density. We interpreted and modelled these phenomena and the crystal’s...
We measured, in the 873–1173 K temperature range, the temperature- and Cd vapor-pressure-dependences of the free electron density in single Cd1-xZnxTe≪In≫ (0 ≤ × ≤ 0.1) crystals with different In contents. Increasing the cooling rate of the crystals and/or decreasing the well-defined Cd vapor pressure reduced the free-electron density. We interpreted and modelled these phenomena and the crystal’s...
A physical yet analytical phase change memory (PCM) model simultaneously accounting for thermal and electrical conductivities is presented. Due to the physics based nature of the model, the essential temperature from heating and cooling of PCM during operation is instantaneously updated. More importantly, the model can be applied to non-conventional circuit design technique. We show that for the first...
In this study, investigation of the insulation performances of the silicone oil as an insulating medium is studied with aim of realization of environmental friendly electric power apparatus, which is considered to be flame retardant. This investigation is searching for the streaming electrification characteristics when silicone oil flows in consideration of cooling of electric power apparatus. In...
An inexpensive microelectronic environmental test chamber design is proposed that can vary the temperature with a range of greater than 10degC to 90degC. The chamber is capable of automating temperature cycling as well as automating the electronic measurements taken. Driven by thermoelectric devices, the chamber is exceptionally space efficient and flexible in use; occupying an area of less than 1...
ldquoDevelopment for advanced thermoelectric conversion systemsrdquo supported by the new energy and industrial technology development organization (NEDO) has been successfully completed as one of the Japanese national energy conservation projects. Three types of the cascaded thermoelectric modules operating up to 850 K in high electrode temperature and two types of Bi-Te thermoelectric modules operating...
Deformation of Bi2Te3-based materials was performed. The source disks with nominal compositions of (Bi0.25Sb0.75)2Te3, (Bi0.25Sb0.75)2(Te0.95Se0.05)3 and (Bi0.90Sb0.10)2(Te0.95Se0.05)3 were cut from the ingots grown by the vertical Bridgman method (VBM). The disks were deformed by either cold press (CP) or pressure current heating (PCH). The crystal structures of the deformed materials were identified...
Bulk nanostructured (Bi,Sb)2Te3 compounds and GeTe based amorphous/nanocrystal composites have been successfully fabricated by the combined hydrothermal/hot-pressing and quenching/annealing methods, respectively. The (Bi,Sb)2Te3 nanopowders synthesized by hydrothermal method exhibit a hollow-like structure. After hot-pressing, the nanoscale grains varying from tens to hundreds of nanometers were found...
Cooling is important to keep the temperatures of the highly integrated silicon electronic devices and power devices e.g. power MOSFET, IGBT. Yamaguchi et al. have proposed a new scheme to cool down the devices by its own current named ldquoself-cooling devicerdquo, in which the cooling process uses Peltier effect. In the proposed scheme, we should use the materials that have high thermal conductivity,...
Optical communication systems based on dense wavelength division multiplexing (DWDM) would benefit from the ability to adjust the operating wavelength of a laser transmitter. Previous attempts, including thermal adjustment, etalon based wavelength locking, and various types of optical frequency and phase locked loops such as the Pound-Drever-Hall technique suffer from weaknesses including sensitivity...
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