镀55%铝锌板在冰箱后背板上的应用

镀55%铝锌钢卷的铝锌合金结构是由55%铝、43.4%锌与1.6%硅在600℃高温下固化而组成。其整体结构由铝、铁、硅、锌形成致密的四元结晶体,此结晶体在钢板上形成一层屏障,因此能有效地防止腐蚀因子穿透。     

基于非接触IC卡自动计时停车收费系统设计开发

根据停车场智能化管理的需要提出了系统设计思想。系统硬件设备由入口设备、出口设备和发卡设备组成，论述了它们的硬件电路设计和软件设计，并重点讨论了IC卡读写的硬、软件设计。     

Robust Multigrid Methods for Nearly Incompressible Elasticity

We consider multigrid methods for problems in linear elasticity which are robust with respect to the Poisson ratio. Therefore, we consider mixed approximations involving the displacement vector and the pressure, where the pressure is approximated by discontinuous functions. Then, the pressure can be eliminated by static condensation. The method is based on a saddle point smoother which was introduced for the Stokes problem and which is transferred to the elasticity system. The performance and the robustness of the multigrid method are demonstrated on several examples with different discretizations in 2D and 3D. Furthermore, we compare the multigrid method for the saddle point formulation and for the condensed positive definite system. Received February 5, 1999; revised October 5, 1999     

Theoretically supported scalable BETI method for variational inequalities

Summary The Boundary Element Tearing and Interconnecting (BETI) methods were recently introduced as boundary element counterparts of the well established Finite Element Tearing and Interconnecting (FETI) methods. Here we combine the BETI method preconditioned by the projector to the “natural coarse grid” with recently proposed optimal algorithms for the solution of bound and equality constrained quadratic programming problems in order to develop a theoretically supported scalable solver for elliptic multidomain boundary variational inequalities such as those describing the equilibrium of a system of bodies in mutual contact. The key observation is that the “natural coarse grid” defines a subspace that contains the solution, so that the preconditioning affects also the non-linear steps. The results are validated by numerical experiments.      

Stabilization and Target Delivery of Nattokinase Using Compression Coating

ABSTRACT

The aim of the work is to develop a new formulation in order to stabilize a nutraceutical enzyme Nattokinase (NKCP) in powders and to control its release rate when it passes through the gastrointestinal tract of human. NKCP powders were first compacted into a tablet, which was then coated with a mixture of an enteric material Eudragit® L100-55 (EL100-55) and Hydroxypropylcellulose (HPC) by direct compression. The activity of the enzyme was determined using amidolytic assay and its release rates in artificial gastric juice and an intestinal fluid were quantified using bicinchoninic acid assay. Results have shown that the activity of NKCP was pressure independent and the coated tablets protected NKCP from being denatured in the gastric juice, and realized its controlled release to the intestine based on in vitro experiments.     

基于AT89C55单片机的数控机床远程测控仪的研制

研制了一种基于AT89C55单片机的数控机床远程测控仪,主要介绍了该测试仪的硬件和软件设计,详述了数控机床远程测控的基本原理,并在数控机床远程控制平台上进行了直线插补和圆弧插补等插补精度的实时远程测试和误差分析。该测试仪已在多家单位生产实践中应用,测试效果良好。     

37Mn5钢J55钢管混晶分析

混晶组织会影响钢管产品的性能。结合生产３７Ｍｎ５钢Ｊ５５油井用管的组织性能分析，指出了Ｊ５５钢管产生混晶组织的工艺原因， 提出了预防和改善的措施     

添加A12O3纳米粉对中空钢55SiMnMo力学性能与夹杂物的影响

研究了中空钢55SiMnMo还原前期加0、018％、铸锭时加0．002％的120nmAl2O3纳米粉后钢的力学性能和夹杂物。结果表明，添加0．02％Al2O3纳米粉使锻后空冷55SiMnMo钢的屈服强度提高了13．9％，常温冲击韧性提高了70．8％；场发射SEM观察得出Al2O3纳米颗粒大多数成为非金属夹杂物的核心，钢中大部分夹杂物得到了细化，尺寸均在300nm～3μm之间。     

55Q轻轨断裂分析

55Q轻轨在使用前由于受到机械加工力而断裂，进行了化学成分，显微组织、夹杂物和低倍检验分析。结果表明，其发生断裂的主要原因是存在较多的小发纹（白点），加之较严重网状组织、夹杂物、晶粒粗大和边部脱碳组织，在机械加工力的共同作用下，导致轻轨发生断裂。     

Semiconductor characterization by scanning ion beam induced charge (IBIC) microscopy

The acronym IBIC (ion beam induced charge) was coined in the early 1990s to indicate a scanning microscopy technique which uses MeV ion beams as probes to image the basic electronic properties of semiconductor materials and devices. Since then, IBIC has become a widespread analytical technique to characterize materials for electronics or for radiation detection, as testified by more than 200 papers published so far in peer-reviewed journals. Its success stems from the valuable information IBIC can provide on charge transport phenomena occurring in finished devices, not easily obtainable by other analytical techniques. However, IBIC analysis requires a robust theoretical background to correctly interpret experimental data. In order to illustrate the importance of using a rigorous mathematical formalism, we present in this paper a benchmark IBIC experiment aimed to test the validity of the interpretative model based on the Gunn’s theorem and to provide an example of the analytical capability of IBIC to characterize semiconductor devices.