Visualizing the Spin & Radiation of the Extended Electron in Magnetic Field

This article presents illustrations of an extended model of the electron to visualize how it spins and radiates in the external magnetic field. A time-varying magnetic field B produces a rotational induced electric field E which rotates (spins) the electron about its axis. In time-constant magnetic field: the electron radiates the cyclotron radiation. In time-varying magnetic field: synchrotron radiation is generated. The couplings between spin, acceleration and radiation will be discussed.

Static electric dipole polarizability of lithium atoms in Debye plasmas

The static electric dipole polarizabilities of the ground state and n≤3 excited states of a lithium atom embedded in a weekly coupled plasma environment are investigated as a function of the plasma screening radium.The plasma screening of the Coulomb interaction is described by the Debye-H（u|¨）ckel potential and the interaction between the valence electron and the atomic core is described by a model potential.The electron energies and wave functions for both the bound and continuum states are calculated by solving the Schrodinger equation numerically using the symplectic integrator.The oscillator strengths,partial-wave,and total static dipole polarizabilities of the ground state and n≤3 excited states of the lithium atom are calculated.Comparison of present results with those of other authors, when available,is made.The results for the 2s ground state demonstrated that the oscillator strengths and the static dipole polarizabilities from np orbitals do not always increase or decrease with the plasma screening effect increasing, unlike that for hydrogen-like ions,especially for 2s→3p transition there is a zero value for both the oscillator strength and the static dipole polarizability for screening length D = 10.3106a0,which is associated with the Cooper minima.

Research on the Static Magnetic Field of Ships with Corrosion and Anticorrosion Efficacy Using Electric Dipole Model

In the case of three-layered(air-seawater-seabed)model,the analytical expressions of the static electric and static magnetic field produced by the static electric dipole located in seawater were derived by using the mirror image theory.Combined with the distribution of the underwater electric potential measured in laboratory,an electric dipole model for physical scale of ship was established and the distribution characteristics of an actual ship' s corrosion related magnetic field were obtained.Based on established models,theoretical analysis and calculation were made to catch out the distribution characteristics of static magnetic field related with corrosion and anticorrosion,which can not be measured directly in seawater.The results show that the static magnetic field related with corrosion and anticorrosion is a kind of noteworthy obstacle signal for degaussed ships.

Saturated sodium chloride solution under an external static electric field: A molecular dynamics study

The behavior of saturated aqueous Na Cl solutions under a constant external electric field(E) was studied by molecular dynamics(MD) simulation. Our dynamic MD simulations indicated that the irreversible nucleation process towards crystallization is accelerated by a moderate E but retarded or even prohibited under a stronger E, which can be understood by the competition between self-diffusion and drift motion. The former increases with E, thereby accelerating the nucleation process, whereas the latter pulls oppositely charged ions apart under a stronger E, thereby decelerating nucleation.Additionally, our steady-state MD simulations indicated that a first-order phase transition occurs in saturated solutions at a certain threshold Ec. The magnitude of Ec increases with concentration because larger clusters form more easily when the solution is more concentrated and require a stronger E to dissociate.

Variation of Two-photon Absorption Cross Sections and Optical Limiting of Compounds Induced by Static Electric Field

由数字地用一个反复的预言者修正者解决 Maxwell-Bloch 方程有限差别的时间域技术，我们调查在 4,4 二度(di-n-butylamino ) 宣传很少周期激光脉搏的性质芪(BDBAS ) 分子的媒介当一个静态的电场存在时。动态二光子的吸收(TPA ) 十字节被获得并且光限制(OL ) 行为被显示。结果证明当静态的电场紧张增加时，动态 TPA 生气的节被提高， OL 行为被改进。而且，平顺序、奇怪顺序的泛音光谱因为它打破 BDBAS 分子的倒置对称，部件与静态的电场的存在被产生。这个工作提供一个方法调制 BDBAS 混合物的非线性的光性质。

Static Electric-Spring and Nonlinear Oscillations

The author designed a family of nonlinear static electric-springs. The nonlinear oscillations of a massively charged particle under the influence of one such spring are studied. The equation of motion of the spring-mass system is highly nonlinear. Utilizing Mathematica [1] the equation of motion is solved numerically. The kinematics of the particle namely, its position, velocity and acceleration as a function of time, are displayed in three separate phase diagrams. Energy of the oscillator is analyzed. The nonlinear motion of the charged particle is set into an actual three-dimensional setting and animated for a comprehensive understanding.

Electrical model parameters identification of radiofrequency discharge in argon through 1D3V/PIC-MC model

This work represents a contribution to the modeling of a radiofrequency(RF) discharge in argon at low pressure(from 25 to 200 mTorr).It is started by the validation of the collision cross sections used in the particle model through a comparison between the transport coefficients calculated by these data and the measurements of the transport coefficients already exist in the literature,the particle model is also validated by a comparison between the calculated plasma density and that measured in the literature.The electrical model proposed in this work consists of replacing the RF discharge by a passive circuit(resistance in series with a capacitor),where the resistance represents the plasma medium and the obstruction of the passage of the electronic current,and the capacitor represents the sheaths and the appearance of the displacement current in these regions.The parameters of the electrical model are obtained through particle modeling.The electrical model presented accurately reproduces the current of the discharge,but without considering the phenomenon of distortion.The total harmonic distortion rate follows the variation of the plasma density;its maximum value is 5.75% at 100 mTorr.

炭黑/废纸导电纤维的制备及其在聚丙烯中的应用

利用多巴胺氧化自聚合将炭黑粘附到废纸纤维表面,制备了炭黑/废纸柔性导电纤维,分析了炭黑含量对纤维导电性能的影响,然后,将该导电纤维与聚丙烯熔融共混制备复合材料,分析了导电纤维添加量对复合材料导电和力学性能的影响。结果表明,聚多巴胺将炭黑均匀粘附在废纸纤维表面,纤维的电阻率随着炭黑含量增加而逐渐降低,当炭黑含量为15%时,废纸纤维的电阻率logρ下降至2.16Ω·cm。柔性导电纤维能更好地控制聚丙烯复合材料电导率降低幅度,当纤维添加量为15%(炭黑含量为2.27%)时,复合材料的表面电阻率为3.71×10^(10)Ω,体积电阻率为2.45×10^(11)Ω·cm,能达到抗静电级别。此时,复合材料的弹性模量和拉伸强度分别为565.65和17.01 MPa,模量提高了1.07%,但强度降低了32.82%。

聚烯烃颗粒在气力输送中静电起电特性研究

为了探究不同聚烯烃粉体颗粒在气力输送过程中起电特性,采用一套自制气力输送实验系统,探究了气力输送过程中不同气固浓度参数对PETG、PP、ABS这3种聚烯烃颗粒静电起电特性的影响规律。结果表明:气力输送过程中PETG与PP颗粒带负电荷,ABS颗粒带正电荷,质量流量和输送空气速度对PETG、PP颗粒的荷质比变化呈类似的变化规律,而ABS颗粒的规律则有所不同。随着颗粒质量流量增大,PETG和PP分别表现为总负电荷量减小;而相同质量流量条件下ABS颗粒则表现为总正电荷量增加。随着输送空气速度增加,3种聚烯烃颗粒所带电荷也会增加,但PETG和PP颗粒电荷极性则会出现极大值。

热挤压和脉冲电流对AZ91镁合金及其复合材料显微组织和力学性能的影响

为探究SiC_(p)对AZ91镁合金在电脉冲处理过程中组织和性能演变规律的影响,通过在AZ91合金中添加1%(体积分数)微米级SiC_(p)制备了SiC_(p)/AZ91复合材料,联合低温正挤压和电脉冲处理对AZ91合金和SiC_(p)/AZ91复合材料的组织进行细化,利用光学显微镜分析显微组织的演化,测试合金和复合材料的室温力学性能。结果表明,和AZ91合金相比,添加了增强相颗粒后的复合材料挤压之后具有更高的位错密度和形变储存能,从而促进电脉冲处理时的静态再结晶过程。电脉冲处理后的AZ91合金及复合材料的屈服强度和抗拉强度分别为320、450 MPa和380、454 MPa。由于SiC_(p)与镁基体界面处应力集中而形成的微裂纹,导致复合材料抗拉强度增幅较小。

电动挖掘机落物保护装置拓扑优化设计

针对某型电动挖掘机的乘员防护,提出使用基于等效静态载荷法的拓扑优化方法设计落物保护装置(Falling Object Protective Structures,FOPS)。首先,使用基于位移等效原则的等效静态载荷法,将动态非线性碰撞过程简化为多工况条件下的静态非线性变形过程。随后,提出使用加权系数法,将动态非线性拓扑优化简化为多工况条件下的静态非线性拓扑优化,可显著提高拓扑优化的计算速率和收敛性。最后,基于拓扑优化结果设计FOPS,并按照GB/T 17771—2010进行仿真试验分析。结果表明,新设计的FOPS无须额外加强即可满足乘员落物保护要求,且FOPS的总质量减轻了49.8 kg,这对降低工程机械的采购和使用成本,以及满足节能减排具有积极意义。

高钝感电起爆器的结构设计及性能研究

针对双桥电起爆器钝感要求,使用桥带升温数学模型和三维建模编程的方法,进行了相关结构设计及性能试验验证。研究表明:采用防静电板和接线板的结构设计,防静电性能稳定,能够承受16 A直流电流的冲击而不失效;当桥带厚度为0.02 mm、桥带宽度为0.32 mm时,能够满足桥路熔断时间不大于60 ms的要求;锆/高氯酸钾和D8型硼/硝酸钾点火药配合使用,能够满足安全电流1A、1 W、5 min的要求,且发火可靠。

一种无机改性导电共聚酯的研究

涤纶是聚酯纤维习惯叫法,具有强度高、易清洗、染色牢度高、技术成熟、生产成本低的优点,是理想的纺织品原料,但它的缺点也很明显,其分子结构中缺少亲水性基团,因此纤维的公定回潮率低,纤维互相摩擦产生的静电不容易快速消散,积累的静电到一定程度时会击穿空气瞬间释放产生火花,危害生产安全。本研究以硅藻土、海藻酸钠分散在乙二醇中配制成吸湿改进剂,在分子链中接枝少量亲水性的磺酸基团,增加纤维的吸湿率,从源头降低体积比电阻。

基于成长体系的电动汽车充电站需求响应方法研究

随着中国新型电力系统建设的逐步开展,需求响应作为优化电网调控的方式之一,在新型电力系统中得到了广泛的应用。为解决电动汽车充电站对不同类型的电动汽车用户需求响应激励不足的问题,提出了一种基于成长体系的电动汽车充电站需求响应方法。该方法采用电动汽车充电需求和电池退化成本计算电动汽车充电站需求响应成本,通过电动汽车用户需求响应成长值等级激励措施,实现了对不同需求的电动汽车用户需求响应价格的浮动,从而保持了前段电动汽车用户的需求响应活跃度,提升了电动汽车充电站需求响应的盈利能力。在某城市的实例运行表明,相较于多时间尺度随机优化需求响应方法,该方法的利润提高了77.97%。该方法能激励电动汽车参与需求响应,提升电动汽车充电站盈利能力。

固化土双向制样仪研发与制样效果多尺度对比

该文研发了一款电动双向固化土试样制样仪,通过与击实法及静压法制样的试样进行宏观、细观、微观对比,分析验证双向制样仪的可行性。结果表明:在宏观层面上,双向试样固化土无侧限抗压强度最高,静压试样次之,而击实试样最低;双向试样固化土整体外观颜色一致且破坏形式稳定,均为剪切破坏,均匀性优于击实法和静压法试样。在细观层面上,双向试样的表观孔隙最少且分布均匀。在微观层面上,双向试样内部微观结构最致密,进汞量最少,孔隙体积占比以直径较小的颗粒间孔隙为主。因此,多尺度对比研究表明,自主研发的双向制样仪的制样效果优于静压仪和三瓣模(或双瓣模),可在土工试验中推广应用。

基于工业数据挖掘的ESD软失效分析

针对电子产品出货后出现ESD软失效而导致的退货现象,文章通过机器学习算法分析产品ICT电性能测试参数、生产线ESD防护监控数据和产品ESD软失效的相关性。集成算法模型经过优化,分类准确率达到0.88,可以用于量产电子产品的ESD软失效的识别和出货风险管控。同时,利用ESD防护监控点风险指数数据集可以提高产品ESD软失效的识别准确率(8.6%)。安装部署基于物联网技术的静电放电防护监控系统,对管控电子产品生产过程中的ESD软失效风险以及控制出货风险是很有帮助的,可以提高电子制造业防静电管控的智慧化水平。

抗静电PET聚酯的研究进展

聚对苯二甲酸乙二醇酯(PET)性能优越,但本身吸湿性较差,静电现象严重,对其加工和应用带来严重的负面影响。首先对静电产生的原因、抗静电原理和抗静电性能的评价方法做了阐述,进一步详细介绍了目前发展的各种抗静电方法及其优缺点,同时说明了适用于各方法的抗静电剂的特征,并对该领域的下一步发展进行了展望。

电子企业制造过程中的静电防护研究

随着近几年电子企业制造业的发展,大部分生产企业都已经对静电防护有了一个深刻的认知,静电防护对电子产品的品质与寿命有着重要的影响。首先,从静电防护的管控重点出发,指明了如何在制造过程中以尽可能小的成本投入做到有效的静电防护,并展示了目前电子企业的一些防护现状,包括存在的一些薄弱环节。然后,从静电防护管理的体系和具体的静电管控标准两方面引出了具体的改善思路。最后,结合一家开关供应商的改善具体案例,完整地表述了怎样真正地把静电防护做到位。为静电防护的应用提供了一些实践的方法与启示,期望能引导我国电子企业通过完善的静电防护达到提高电子产品质量的目的。

电动车车身骨架静态特性多目标优化

针对微型电动车交通事故频发、车身骨架现有研究不足等问题,根据某款微型电动车车身骨架的有限元模型采取了工程设计中的计算机辅助工程(CAE)分析和多目标优化设计的概念对其车身骨架进行静态特性多目标优化。采取三组方案进行对比,在模型精度和计算效率之间做出取舍,得到最优的优化方案,在最终的优化结果对比和计算效率之间,方案三采用移动最小二乘法的方案在精度和效率上最佳。优化后,在车身质量没有大幅度变化的情况下,车身的扭转刚度增加了410.75 N·m/°,弯曲刚度增加了1 041.2 N/mm,该车身骨架静态性能明显提升。