A new triangle element for the axisymmetric UBET

UBET is a useful technique for the analysis of forging and other metal forming processes. However, geometrical shape of a element used in this technique is limited to a rectangle or a right angle triangle. To overcome this problem, an arbitrary shape triangle element which define a kinematically admissible velocity field using stream function is proposed and applied to the UBET. Although, this triangle element is a proper element to be used for the analysis of plane strain problem, it has several problems to be applied to axisymmetric problem. Therefore, a new arbitrary shape triangle element which has constant inlet flow at the side of the triangle is developed. On this element, a kinematically admissible velocity field is expressed easily using stream function and a second order isoparametric triangle element. The power consumption is calculated by the numerical integration. Also, a new conversion technique is introduced for the minimization of power consumption, and it makes possible to use many variables on UBET.     

Fabrication of gradient distribution alumina short fibre reinforced aluminium alloy

Gradient distribution alumina short fibre reinforced 6061 aluminium alloy have been fabricated by taking advantage of preform compressive deformation during squeeze casting. Pressure was applied mechanically by a punch. Velocity of the punch, pre-heat temperature of the preforms and pouring temperature were controlled during the infiltration of molten 6061 alloy into alumina short fibre preforms. The distribution of hardness along the infiltration direction in the composites was measured and the distribution of volume fraction along the infiltration direction was calculated by the hardness. Velocity of the inflow, pre-heat temperature of the preform, pouring temperature of the molten metal, binder content of the preform and volume fraction of fibres, all have a very great effect on the gradient distribution of alumina short fibres in the aluminium alloy composites.     

ALC-CH系统在水热处理过程中的物理化学变化Ⅰ水热处理温度的影响

采用ＴＧ－ＤＴＡ，ＩＲ，ＸＲＤ和ＮＭＲ对ＡＬＣ（压蒸轻质混凝土）废渣中添加氢氧化钙后的ＡＬＣ－ＣＨ系统，在水热处理过程中的物理化学变化进行了分析，同时用ＢＥＴ方法测定了不同温度水热处理物的比表面积。结果表明，ＡＬＣ渣添加适量氢氧化钙，经１４０～２００℃下水热处理３ｈ的水热处理物理中形成了新的水化硅酸钙α－Ｃ２ＳＨ．α－Ｃ２ＳＨ的形成量随水热处理温度的提高而增加。水热处理物的比表面积波动于１２～２２     

Modeling of Gate Current and Capacitance in Nanoscale-MOS Structures

By applying a fully self-consistent solution of the Schrodinger-Poisson equations, a simple unified approach has been developed in order to study the gate current and gate capacitance of nanoscale-MOS structures with ultrathin dielectric layer. In this paper, the model has been employed to investigate various gate structure and material combinations, thereby demonstrating wide applicability of the present model in the design of nanoscale-MOSFET devices. The results obtained by applying the proposed model are in good agreement with experimental data and previous models in the literature. A new result concerning optimum nitrogen content in HfSiON high-k gate-dielectric structure reported in this paper requires experimental verification through device fabrication     

On uniqueness Theorems for Tsallis entropy and Tsallis relative entropy

The uniqueness theorem for Tsallis entropy was presented in H. Suyari, IEEE Trans. Inf. Theory, vol. 50, pp. 1783-1787, Aug. 2004 by introducing the generalized Shannon-Khinchin axiom. In the present correspondence, this result is generalized and simplified as follows: Generalization : The uniqueness theorem for Tsallis relative entropy is shown by means of the generalized Hobson's axiom. Simplification: The uniqueness theorem for Tsallis entropy is shown by means of the generalized Faddeev's axiom     

On the pressure projection in elasto-hydrostatic lubrication problems—Part 2: FE approximation to observe the pressure projection

We have argued in Part 1 that the conventional Reynolds equation including the deformation of elastic disc does not obtain the pressure spike. However, as the experimental results in some papers have found the pressure projection, it can be intuitively explained as being caused by something hard in the oil film; by the pressure sensor, namely, manganin; or by the solidified lubricant. In this paper, the first of these possible causes is analyzed, for the first time, by introducing the fluid velocity variable in the direction of the oil film thickness and using the solid–fluid coupled finite-element (FE) method. It is shown by the numerical results based on Hamilton's experimental data that the pressure projection can be obtained by introducing the thickness of the pressure sensor, and that the projection profile varies with the sensor location on the disc. However, to solve the non-linearity of lubricant viscosity accurately is left for future research because the above FE analysis does not converge with the experimental data.     

Synthesis and Superconducting Properties of Layered Ruthenocuprates

Superconducting properties of layered ruthenocuprates, RuSr ₂ RECu ₂ O ₈ and RuSr ₂ (RE _1-x Ce _x ) ₂ Cu ₂ O ₁₀ (RE = Sm, Eu, Gd), are investigated. The differences between superconductivity of these two phases are considered to be due to, their structural differences ; The RE/Sr substitution is more feasible in RuSr ₂ RECu ₂ O ₈ than in RuSr ₂ (RE _1-x Ce _x ) ₂ Cu ₂ O ₁₀ , while the latter phase shows larger oxygen nonstoichiometry. The superconducting RuSr ₂ Eu ₂ Cu ₂ O ₈ (T _{c, onset} = 25K, T _{c, zero} = 7K) phase was successfully synthesized for the first time, and coexistence of superconductivity and ferromagnetism in these systems was reconfirmed by using single-phase samples.     

新型50A和75A／600V压注模封装IPM

介绍了额定值为50 A/600 V和75 A/600 V的大型双列直插式智能功率模块(第4代DIPIPMTM),该产品是三菱电机针对柜式变频空调和工业变频驱动应用而开发的。它采用第5代全栅型CSTBTTM硅片、小型化IC和新型导热绝缘膜等多项新技术。     

SAR characterization inside intracranial tumors for case–control epidemiological studies on cellular phones and RF exposure

Epidemiological studies investigating whether mobile phone use is related to cancer risk have been conducted in many countries. The purpose of the work reported here was to introduce the dose metric in the exposure assessment, taking into account the spatial distribution of exposure. Distributions of specific absorption rate (SAR) inside 275 cases of brain tumors (participants in the Japanese epidemiological study) were estimated. Phones had been classified into four categories based on SAR distributions and technical specifications. Results were found to be highly dependent on phone categories. Contralateral tumors were generally categorized as non-exposed tumors (max SAR <2.5% of max SAR in the brain) and, for any phone category, the maximum SAR in 75% of the ipsilateral tumors was less than 15% of the maximum SAR in the brain. Three new exposure indices combining the duration and strength of exposure were created to be used in the Japanese epidemiological study on mobile phone use and the risk of gliomas and meningiomas.