Pbody浓度对VDMOS器件EAS特性的影响

从VDMOS器件EAS测试的原理出发,通过统计实际生产中出现的EAS不良现象,得出EAS测试不良的两种主要现象,一种为EAS测试后器件烧毁,显示PRE-SHORT损坏提示,第二种为EAS测试不通过显示POST-SHORT损坏提示,但器件没有烧毁。分别从器件源胞结构,以及EAS测试的时序上对两种不良现象的产生原因进行分析,得出源胞结构中的寄生电阻RB大,器件的Tf大是造成两种EAS不良的原因,提出通过提高Pbody浓度来降低源胞结构中的寄生电阻RB,并结合TCAD仿真,提出提高Pbody浓度来降低器件的Tf。最后通过对比实验验证不同Pbody浓度对器件EAS特性的影响,得到增加Pbody浓度可以有效提高器件EAS通过率与极限耐量。     

中瑞思创拓展软标签和RFID业务

中瑞思创公司专注于电子商品防盗系统（EAS）的标签业务。该公司从事EAS各类标签和配套设备的制造和出口,客户主要是全球EAS系统集或商和产品经销商。目前公司90%以上的营业收入和利润都来自有标签业务,其中硬标签占营业收入和利润的70％以上。     

58KHZ声磁防盗系统原理研究

本文针对EAS系统需要极低的误报率及漏报率的要求,采用当前代表行业主流的58k Hz声磁技术设计了一套完整的EAS系统工作原理及实现方式。主要解决了声磁标签幅度特性、频率特性的检测技术问题,检测带宽小于600Hz,保证了系统工作性能。     

Functional Recovery with Electro-Acupuncture Stimulation in an Mecp2-Knockout Rat Model of Rett SyndromeOA

Rett syndrome is a progressive neurodevelopmental disorder that lacks effective treatments. Although deep-brain stimulation can alleviate some symptoms in Rett model mice, this interventional manipulation requires deliberate surgical operations. Here, we report that electro-acupuncture stimulation(EAS)can ameliorate symptoms of an Mecp2-knockout rat model of Rett syndrome from the remote acupoints Baihui(GV 20), Yongquan(KI 1), and Shenmen(HT 7). We find that EAS not only prolongs the survival t...     

土体三维弹塑性分析中的体积闭锁分析及单元选择

在材料不可压缩或胀/缩塑性流动情况下，传统低阶单元有体积闭锁问题。以摩尔－库仑模型为例，推导了塑性剪切应变和塑性体积应变的关系，揭示闭锁产生的原因。分析8节点等参元、Wilson非协调元、EAS单元和14节点单元的闭锁性态，表明8节点单元有严重闭锁性，Wilson非协调元也有闭锁性，EAS单元和采用降阶积分的14节点单元能克服闭锁。单元测试和方形基础的承载力计算两个数值算例证实了分析的结果，为土体三维分析中选择有效可靠的单元提供依据。     

美国保点的Evolve product系列防盗标签

美国保点系统（Checkpoint Systerns）曾于2007年4月27日发布了Evolve product系列标签产品,这些标签将RFID技术与保点公司的电子防盗技术融合在一起。保点公司开发这些双用途标签的目的,在于为他们的零售商客户提供一种既能在库存管理可视化中使用RFID,又能在防盗系统中使用EAS的有力工具,这样零售商就不必在其商品上粘贴两个单独的标签了。     

压电、磁电和梯度功能复合材料的有限元分析及控制仿真

针对压电、磁电和功能梯度材料存在的多场耦合问题开展了深入系统的研究,利用加强假定应变法(EAS)和假定自然应变法(ANS)推导了一个新的八节点固体壳单元,减少了内部变量的个数,提高了计算效率;提出了一个新的电势插值函数,大大减少了电自由度的个数,显著降低了数据读取、存储和凝聚电自由度的计算花费。该单元既可用做实体单元,又可模拟薄曲壳结构,在厚跨比非常小的情况下也能获得令人满意的精度。     

新型功能材料

我国高温超导线材进军国际市场在2003年9月份韩国电工研究所进行的高温超导导线全球招标中,北京英纳超导技术有限公司(简称英纳公司)凭借有特色的高质量产品和有竞争力的价格从众多竞争者中脱颖而出,拿到了7km导线的订单。据了解,参与此次竞标的厂商包括了目前世界上所有主要高温超导导线生产商,如美国超导(AMSC)、日本住友(SUMOTOMO)、德国真空冶炼(现名EAS)和TRITHOR等。相比往年,此次各家产品性能不但有大幅提高,而且价格竞争异常激烈。英纳公司长期以来注重产品的多样性开发,已开发出镀锡、电流引线用等系列产品。在此次招标中…     

可溶性酚醛树脂为碳源合成有序介孔炭及其电催化性能

利用介孔硅SBA-15与苯酚、甲醛混合,原位合成可溶性酚醛树脂,高温炭化得有序介孔炭(C1);同时将预聚的酚醛树脂与SBA-15 共混后再聚合,高温炭化得有序介孔炭(C2).微波多元醇还原法合成Pt/C1、Pt/C2、Pt/CMK-5(糠醇为碳源)电催化剂.使用X射线衍射仪(XRD),N2物理吸附,透射电镜(TEM)和循环伏安技术(CV)对介孔炭的结构和催化剂的性能进行了表征.结果表明:CI主要由规则的六方介孔孔道构成,比表面积为947m2/g,孔径分布集巾在4.5nm,Pt微粒在C1上具有良好的分散性,平均粒径约为3nm.C2的孔道较为模糊,负载的Pt微粒有一定程度的团聚.CV曲线显示,Pt/C1催化剂的电化学活性面积(EAS)为54.2m2/g,其催化甲醇氧化的性能优于Pt/C2及Pt/CMK-5而略筹于商用催化剂Pt/C(E-TEK).     

用碱分解锆英砂制备ZrO2工艺中放射性的分布、处理和回收研究

研究和检测用氢氧化钠分解锆英砂制备ZrO2工艺过程的放射性的走向分布.结果表明,在工业ZrO2的生产工艺中,U和Th主要富集于废酸和ZrOCl2的母液中,也分散于硅渣和水洗液中;两者放射性超标,经转化和处理之后达到排放和堆放要求,并可利用做建筑材料;废酸和母液可以通过TBP萃取分离和回收U和Th,具有工业和经济价值;处理工艺是可行和有效的;废液经沉淀处理之后,沉渣和上清液都达到国家排放和堆放的标准.     

Study of the longitudinal development of individual EAS inferred from the Cherenkov light pulse shape: method and results

The method of Cherenkov pulse shape for the study of longitudinal development of extensive air showers (EAS) is considered. Some results obtained with this method are described: the dependence of the depth of the EAS maxima on the primary energy, evaluation of the inelastic p-¹⁴N cross section, and individual EAS cascade curves.     

Retailers' tagging practices: a potential liability?

This study investigates the coverage of federally mandated information on over‐the‐counter (OTC) drug labels by electronic article surveillance (EAS) tags applied to the exterior of cartons. Using adult‐strength analgesics containing acetaminophen as a case study, researchers investigated the issue in Houston, Texas (24 stores) and Lansing, Michigan (33 stores). The information obscured by EAS tags was identified and classified for a total of 849 packages using a standardized data collection instrument. The results indicated that 293 packages examined, or 34.5%, had information mandated by the US Food and Drug Administration (US FDA) fully or partially obscured by the EAS tags. Retailers and manufacturers should be aware of such practices to reduce potential liability. Recommendations for improving EAS tag usage on OTC products are presented. Copyright © 2004 John Wiley & Sons, Ltd.     

Extremely asymmetrical scattering of optical waves in nonuniform periodic Bragg arrays

The extremely asymmetrical scattering (EAS) of bulk and guided electromagnetic waves in nonuniform periodic Bragg arrays with steplike variations of the grating amplitude is analyzed theoretically by means of a recently developed approach based on allowance for the diffractional divergence of the scattered wave. Arrays of finite and infinite widths are investigated. It is shown that, for thin nonuniform arrays, EAS has the same pattern as for uniform arrays with mean grating amplitude. On the contrary, for wide nonuniform arrays, the scattered wave amplitudes are well determined by local values of the grating amplitude. In this case, the energy of the scattered wave is shown to concentrate mainly in regions with smaller grating amplitude. The sensitivity of EAS to small imperfections of periodic arrays is investigated theoretically. The physical explanation of the observed effects is based on the diffractional divergence of the scattered wave.     

Performance and Stability of Soft Magnetic Elements for Electronic Article Surveillance

A simple figure of merit is proposed to compare the performance of soft magnetic elements for electronic article surveillance (EAS) applications. Annealing experiments were carried out to quantify the evolution of soft magnetic properties of amorphous-metal and Permalloy ribbons used in the library EAS industry. By fitting the kinetics of coercivity change to a simple model based on a uniformly distributed range of activation energies, the room-temperature kinetics of the amorphous elements is predicted     

Two‐ and three‐dimensional transition element families for adaptive refinement analysis of elasticity problems

In this paper, new enhanced assumed strain (EAS) and hybrid stress transition element families are developed for 2D and 3D adaptive refinement analysis of elasticity problems. The EAS element families are based on some existing incompatible transition element families. By using the EAS method and the previous incompatible modes, the B ‐matrix columns associated with the EAS modes can be directly designed such that their domain integrals vanish automatically and they can be computed more efficiently. For 2D hybrid stress transition element families, it is possible to derive different stress fields that lead to rank‐sufficient transition elements. However, the task becomes intractable for 3D hybrid stress transition elements in which many combinations of mid‐side and mid‐face nodes are possible. This paper proposes to use hybrid stress transition element families in which the assumed stress fields are linearly complete. The new 2D element family is more accurate than the 2D rank‐sufficient element family. The new 3D element family is more accurate than the one with additional bilinear stress modes. Numerical examples reveal that the most accurate transition element families are the newly developed hybrid stress families followed by the EAS families, the incompatible families and then the compatible families. Copyright © 2008 John Wiley & Sons, Ltd.     

Penalty parameter-less constraint handling scheme based evolutionary algorithm solutions to economic dispatch

The application and performance comparisons of various evolutionary algorithms (EA) on economic dispatch (ED) problems with non-smooth cost functions considering valve-point effects and multiple fuel options are presented. the eas such as the real-coded genetic algorithm, particle swarm optimisation (PSO) and differential evolution (DE) are considered. New penalty parameter-less constraint-handling scheme is employed to improve the performance of EA. Ten-generator ed test system is taken for simulation purposes. To determine the efficiency and effectiveness of various EAS, two experiments are conducted, considering only multiple fuel options and considering both valve-point and multiple fuel options. the optimal results obtained using various EAS are compared with Nelder-Mead simplex method and previous reported results. to compare the performances of various EAS, statistical measures such as best, mean, worst, standard deviation and mean computation time over 20 independent runs are taken. the simulation experiments reveal that pso performs better in terms of solution quality and consistency. DE performs better in terms of mean computation time. for the first time, Karush-Kuhn-Tucker (KKT) conditions are applied to the solutions obtained using EAS to verify optimality. it is found that the obtained results are satisfying the KKT conditions and confirm the optimality. also, the effectiveness of KKT-based stopping criteria is clearly demonstrated.     

Manufacturing and mechanical properties of soy-based composites using pultrusion

Two primary cost driving factors for the composites industry are raw materials and labor. Inexpensive alternative epoxy resin systems based on epoxidized soyate resins are developed for fiber reinforced composite applications. This research investigated on the manufacturing and mechanical characterization of fiber/epoxy composites using chemically modified soy-based epoxy resins. Co-resin systems with up to 30 wt% soyate resins were used to manufacture composites through pultrusion. Mechanical tests show that the pultruded composites with soy based co-resin systems possess comparable or improved structural performance characteristics such as flexural strength, modulus, and impact resistance. Maximum mechanical properties enhancement is demonstrated by the enhanced epoxidized allyl soyate (EAS) formulation. Further property improvement is obtained through using a two-step prepolymer process. The EAS holds great potential as partial supplement for polymer and composites applications from renewable resources.     

假设应变元的改进

本文在假设应变元^[1][2]基础上,讨论了改进假设应变场的依据,并引入了应变场的改进方案,构造了两种新的假设应变元。新构造的单元和原单元^[1]相比,对扭曲网格的敏感程度明显降低,同时因其基于Hu-Washizu变分原理,因此更适合非线性分析。数值算例表明了该单元的精度。     

In situ magnetic field exposure and ICNIRP-based safety distances for electronic article surveillance systems

Electromagnetic radiation of electronic article surveillance (EAS) systems was investigated in situ for both the detection gate panels and the activators and deactivators. 'Safety distances' for the general public, defined as the distances outside which the magnetic field levels of the EAS systems do not exceed the The International Commission on Non-ionising Radiation Protection reference levels, were determined. Additionally, temporal and frequency behaviour, and signal waveforms were investigated. For the detection gates, the spatially averaged fields exceeded the reference levels for five of the six investigated systems. For the (de)activators, the spatially averaged fields did not exceed the reference levels. Maximal fields up to 148.0 A m(-1) were measured from 20 cm on. The exposure ratios varied from 8 to 13 for EM, from 6 to 8 for AM and from 0.008 to 1.8 for RF systems. Safety distances were maximally 111 cm for EM, 77 cm for AM and 35 cm for RF systems.