新能源汽车电驱动系统加载EMC试验平台电力测功机系统的需求及选型

基于生产厂家的需求,对电波暗室新能源汽车电驱动系统加载EMC试验平台存在的问题进行分析,并提出新的设计方案,完成对电力测功机及其相匹配的供电系统和被测件冷却系统的选型。同时,根据试验需求,设计了数据采集与控制系统,并对该平台进行能力验证。结果表明:该系统对在电波暗室的开发具有一定的参考价值,满足生产厂家的试验需求。

EMC装配式结构中铝合金模板施工技术

铝合金模板在EMC装配式结构中配置墙、柱、梁、板等构件模板,结合工程实际情况,对EMC装配式结构中连接段进行模板优化,体现了工具化模板的适用性,同时保证了现浇连接区段混凝土成型质量要求,可为同类工程施工提供参考。

EMC6与Apaf-1、Caspase-3在宫颈癌组织中的表达及临床预后意义

目的 探讨宫颈癌中EMC6、Apaf-1和Caspase-3蛋白的表达情况,并分析其与患者临床病理特征和预后的关系。方法 采用免疫组化方法检测宫颈癌及癌旁组织中EMC6、Apaf-1和Caspase-3蛋白的表达,并收集患者的临床病理资料进行分析,Spearman检测变量间的相关性,单因素及多因素Cox分析预后影响因素。结果 EMC6、Apaf-1及Caspase-3蛋白在宫颈癌组织中的阳性表达率均低于癌旁组织,差异有统计学意义(P均<0.05);不同临床病理特征间EMC6蛋白阳性表达率差异无统计学意义(P>0.05);不同分化程度宫颈癌患者中Apaf-1蛋白阳性表达率差异有统计学意义(χ^(2)=4.723,P=0.030);不同临床分期和分化程度宫颈癌患者中Caspase-3蛋白阳性表达率差异有统计学意义(χ^(2)=4.495,P=0.034;χ^(2)=5.010,P=0.025)。EMC6与Apaf-1、Caspase-3相关性系数分别为r=0.626(P<0.001)、r=0.554(P<0.001),均呈正相关;单因素检验得出,病理类型(P=0.047)、肿瘤大小(P<0.001)、EMC6(P=0.004)、Apaf-1(P=0.029)和Caspase-3(P=0.039)是影响宫颈癌患者总体生存期的预后因素;多因素分析显示,EMC6(P=0.005)、肿瘤大小(P<0.001)是宫颈癌患者不良预后的独立影响因素。结论 宫颈癌组织中EMC6、Apaf-1和Caspase-3的低表达与患者预后不良相关,其中EMC6与Apaf-1、Caspase-3呈正相关,且EMC6和肿瘤大小是独立的预后因素,这些蛋白在宫颈癌进展中发挥重要作用,有望成为预后标志物和治疗靶点。

提升电磁兼容性(EMC)检测报告规范性与专业性的分析与建议

电磁兼容性(EMC)是电子电气产品的通用质量指标之一。本文通过分析EMC检测报告中所需的通用要素,梳理EMC检测机构运行过程中的常见风险,分析内外部评审对报告质量抽查中发现的问题,并以集成电路辐射发射检测报告为例,分析了EMC检测报告的主要技术参数和关键点,旨在为提升EMC检测机构质量服务效能,以及EMC检测报告的规范性和专业性提供参考。

EMC模式下城市道路照明LED路灯节能改造研究

近年来,随着现代社会的快速发展,我国各级政府越来越重视城市化形象,这需要投入越来越多的资源、人力和物力,能源消耗也逐年上升,从而导致可开发的资源和能源也越来越稀少,因此寻找正确高效的节能减排方法已迫在眉睫。而在这些城市能源消费中,电力消费是其中非常重要的一部分,尤其是城市路灯消费,虽然满足了群众的生活需要,但同时也造成了能源的浪费。基于此,文章介绍了合同能源管理(EMC)模式,分析路灯节能技术的优势,以及城市亮化和路灯节能技术存在的问题,重点对EMC模式下城市道路照明LED路灯节能改造途径进行探讨。

Regulating the dopant clustering in LiZnAs-based diluted magnetic semiconductor

Tuning of the magnetic interaction plays the vital role in reducing the clustering of magnetic dopant in diluted magnetic semiconductors(DMS).Due to the not well understood magnetic mechanism and the interplay between different magnetic mechanisms,no efficient and universal tuning strategy is proposed at present.Here,the magnetic interactions and formation energies of isovalent-doped(Mn) and aliovalent(Cr)-doped LiZnAs are studied based on density functional theory(DFT).It is found that the dopant–dopant distance-dependent magnetic interaction is highly sensitive to the carrier concentration and carrier type and can only be explained by the interplay between two magnetic mechanisms,i.e.,superexchange and Zener’s p–d exchange model.Thus,the magnetic behavior and clustering of magnetic dopant can be tuned by the interplay between two magnetic mechanisms.The insensitivity of the tuning effect to U parameter suggests that our strategy could be universal to other DMS.

Anomalous bond lengthening in compressed magnetic doped semiconductor Ba(Zn_(0.95)Mn_(0.05))_(2)As_(2)

Applying pressure has been evidenced as an effective method to control the properties of semiconductors,owing to its capability to modify the band configuration around Fermi energy.Correspondingly,structural evolutions under external pres-sures are required to analyze the mechanisms.Herein high-pressure structure of a magnetic doped semiconductor Ba(Zn_(0.95)Mn_(0.05))_(2)As_(2)is studied with combination of in-situ synchrotron X-ray diffractions and diamond anvil cells.The materials become ferromagnetic with Curie temperature of 105 K after further 20%K doping.The title material undergoes an isostruc-tural phase transition at around 19 GPa.Below the transition pressure,it is remarkable to find lengthening of Zn/Mn-As bond within Zn/MnAs layers,since chemical bonds are generally shortened with applying pressures.Accompanied with the bond stretch,interlayer As-As distances become shorter and the As-As dimers form after the phase transition.With further compres-sion,Zn/Mn-As bond becomes shortened due to the recovery of isotropic compression on the Zn/MnAs layers.

Performance of Lateral 4H-SiC Photoconductive Semiconductor Switches by Extrinsic Backside Trigger

Photoconductive semiconductor switch(PCSS)can be applied in pulsed high power systems and microwave techniques.However,reducing the damage and increasing the lifetime of silicon carbide(SiC)PCSS are still faced severe challenges.In this study,PCSSs with various structures were prepared on 4-inch diameter,500μm thick high-purity semi-insulating 4H-SiC substrates and their on-state resistance and damage mechanisms were investigated.It was found that the PCSS of an Au/TiW/Ni electrode system annealed at 950℃had a minimum on-state resistance of 6.0Ωat 1 kV bias voltage with a 532 nm and 170 mJ pulsed laser by backside illumination single trigger.The backside illumination single trigger could reduce on-state resistance and alleviate the damage of PCSS compared to the frontside trigger when the diameter of the laser spot was larger than the channel length of PCSS.For the 200 s trigger test by a 10 Hz laser,the black branch-like ablation on Au/TiW/Ni PCSS was mainly caused by thermal stress owing to hot carriers.Replacing metal Ni with boron gallium co-doped zinc oxide(BGZO)thin films annealed at 400℃,black branch-like ablation was alleviated while concentric arc damage was obvious at the anode.The major causes of concentric arc are both pulsed laser diffraction and thermal effect.

Enhanced magnetic anisotropy and high hole mobility in magnetic semiconductor Ga_(1-x-y)Fe_(x)Ni_(y)Sb

(Ga,Fe)Sb is a promising magnetic semiconductor(MS)for spintronic applications because its Curie temperature(T_(C))is above 300 K when the Fe concentration is higher than 20%.However,the anisotropy constant Ku of(Ga,Fe)Sb is below 7.6×10^(3)erg/cm^(3)when Fe concentration is lower than 30%,which is one order of magnitude lower than that of(Ga,Mn)As.To address this issue,we grew Ga_(1-x-y)Fe_(x)Ni_(y)Sb films with almost the same x(≈24%)and different y to characterize their magnetic and electrical transport properties.We found that the magnetic anisotropy of Ga_(0.76-y)Fe_(0.24)Ni_(y)Sb can be enhanced by increasing y,in which Ku is negligible at y=1.7%but increases to 3.8×10^(5)erg/cm^(3)at y=6.1%(T_(C)=354 K).In addition,the hole mobility(μ)of Ga_(1-x-y)Fe_(x)Ni_(y)Sb reaches 31.3 cm^(2)/(V∙s)at x=23.7%,y=1.7%(T_(C)=319 K),which is much higher than the mobility of Ga_(1-x)Fe_(x)Sb at x=25.2%(μ=6.2 cm^(2)/(V∙s)).Our results provide useful information for enhancing the magnetic anisotropy and hole mobility of(Ga,Fe)Sb by using Ni co-doping.

Semitransparent organic photovoltaics enabled by transparent p-type inorganic semiconductor and near-infrared acceptor

Semitransparent organic photovoltaics(STOPVs)have gained wide attention owing to their promising applications in building-integrated photovoltaics,agrivoltaics,and floating photovoltaics.Organic semiconductors with high charge carrier mobility usually have planar and conjugated structures,thereby showing strong absorption in visible region.In this work,a new concept of incorporating transparent inorganic semiconductors is proposed for high-performance STOPVs.Copper(I)thiocyanate(CuSCN)is a visible-transparent inorganic semiconductor with an ionization potential of 5.45 eV and high hole mobility.The transparency of CuSCN benefits high average visible transmittance(AVT)of STOPVs.The energy levels of CuSCN as donor match those of near-infrared small molecule acceptor BTP-eC9,and the formed heterojunction exhibits an ability of exciton dissociation.High mobility of CuSCN contributes to a more favorable charge transport channel and suppresses charge recombination.The control STOPVs based on PM6/BTP-eC9 exhibit an AVT of 19.0%with a power conversion efficiency(PCE)of 12.7%.Partial replacement of PM6 with CuSCN leads to a 63%increase in transmittance,resulting in a higher AVT of 30.9%and a comparable PCE of 10.8%.

宫颈癌组织中EMC6、C-myc及BCL-2的表达和预后

目的通过生信分析,评估EMC6基因在泛癌及宫颈癌中的表达、免疫相关性及诊断价值,并探究EMC6、C-myc、BCL-2蛋白与宫颈癌的相关性及预后。方法分析TCGA和GTEx数据库中EMC6在泛癌和宫颈癌的表达,并利用SangerBox和Timer数据库评估EMC6与免疫相关性,以及ROC评估诊断潜力。通过免疫组化在68例宫颈癌及癌旁组织中检测EMC6、C-myc、BCL-2蛋白表达,分析其与临床病理特征的联系。使用Phi系数法分析相关性,并利用Kaplan-Meier法评估这些蛋白对预后的影响。结果宫颈癌中EMC6表达降低,对免疫浸润有显著影响,且诊断准确性较高(AUC=0.819)。免疫组化显示,与宫颈癌旁组织相比,EMC6蛋白表达下降、而C-myc和BCL-2蛋白表达上调,差异均有统计学意义(P<0.05)。EMC6表达与临床病理特征无相关性(P>0.05),而C-myc与病理类型相关(P<0.05),BCL-2与年龄、病理类型、肿瘤大小、分化程度相关(P<0.05)。EMC6与C-myc、BCL-2表达在宫颈癌中呈负相关(Phi=-0.367,P=0.002;Phi=-0.284,P=0.019),且三者与患者总生存期显著相关(P<0.05)。结论宫颈癌中EMC6蛋白表达下降,与C-myc、BCL-2蛋白表达呈负相关,且这些蛋白的表达水平与患者的总生存期之间存在显著的相关性,提示它们可能作为宫颈癌治疗和预后评估的潜在生物标志物。

Indentation behavior of a semi-infinite piezoelectric semiconductor under a rigid flat-ended cylindrical indenter

This paper theoretically studies the axisymmetric frictionless indentation of a transversely isotropic piezoelectric semiconductor(PSC)half-space subject to a rigid flatended cylindrical indenter.The contact area and other surface of the PSC half-space are assumed to be electrically insulating.By the Hankel integral transformation,the problem is reduced to the Fredholm integral equation of the second kind.This equation is solved numerically to obtain the indentation behaviors of the PSC half-space,mainly including the indentation force-depth relation and the electric potential-depth relation.The results show that the effect of the semiconductor property on the indentation responses is limited within a certain range of variation of the steady carrier concentration.The dependence of indentation behavior on material properties is also analyzed by two different kinds of PSCs.Finite element simulations are conducted to verify the results calculated by the integral equation technique,and good agreement is demonstrated.

Analysis of piezoelectric semiconductor fibers under gradient temperature changes

Piezoelectric semiconductors(PSs)possess both semiconducting properties and piezoelectric coupling effects,making them optimal building blocks for semiconductor devices.PS fiber-like structures have wide applications in multi-functional semiconductor devices.In this paper,a one-dimensional(1D)theoretical model is established to describe the piezotronic responses of a PS fiber under gradient temperature changes.The theoretical model aims to explain the mechanism behind the resistance change caused by such gradient temperature changes.Numerical results demonstrate that a gradient temperature change significantly affects the physical fields within the PS fiber,and can induce changes in its surface resistance.It provides important theoretical guidance on the development of piezotronic devices that are sensitive to temperature effects.

EMC装配式结构中铝合金模板施工技术研究

随着现代建筑行业不断发展,装配式结构作为一种高效、节能、环保的新型建筑模式备受瞩目。由于其快速、精准的安装特点,铝合金模板在装配式结构中扮演着重要角色。该材料具有优异的强度和耐腐蚀性能,能够满足建筑对质量和寿命的要求。此外,铝合金模板还具有良好的加工性能,可根据设计要求进行定制,赋予建筑更多个性化可能。因此,铝合金模板在现代建筑领域有着广泛的应用前景,将对建筑工程质量和效率带来显著提升。

大型设备EMC性能现场评估方法

大型设备由于尺寸过大或供电要求过高无法进入实验室进行电磁兼容(EMC)性能测试,目前大型设备无明确的EMC现场测试标准要求。文章阐述了电磁兼容风险评估技术的分析机理及EMC风险评估理想模型,介绍了EMC风险评估要素识别、分析及EMC风险评价方法。借助电磁兼容风险评估技术可评价大型设备的EMC性能,也有助于大型设备现场测试中发现问题后,借助EMC风险评估技术发现EMC风险点,提出相应的风险减缓措施,以提升大型设备的EMC性能。

First-Principle Study on the Electronic Structure and Optical Property of New Diluted Magnetic Semiconductor(Y_(0.75)Ca_(0.25))(Cu_(0.75)Mn_(0.25))SO

The band structure,DOSs,and optical properties of(Y_(0.75)Ca_(0.25))(Cu_(0.75)Mn_(0.25))SO,including dielectric function,absorption function,reflection function,and energy loss spectrum were studied by using the first-principles calculation.The calculation results indicate that(Y_(0.75)Ca_(0.25))(Cu_(0.75)Mn_(0.25))SO is a direct bandgap semiconductor with a bandgap of 1.1 eV.The Fermi surface is asymmetric and exhibits spin splitting phenomenon.The new type of dilute magnetic semiconductor(Y_(0.75)Ca_(0.25))(Cu_(0.75)Mn_(0.25))SO exhibits significant light loss around 70 eV,with light reflection gradually increasing after 30 eV,and light absorption mainly occurring around 8-30 eV.These results also provide a basis for the discovery of more types of 1111 phase new dilute magnetic semiconductors in the future.

Two-dimensional Cr_(2)Cl_(3)S_(3)Janus magnetic semiconductor with large magnetic exchange interaction and high-T_(C)

The two-dimensional(2D)Janus monolayers are promising in spintronic device application due to their enhanced magnetic couplings and Curie temperatures.Van der Waals CrCl_(3) monolayer has been experimentally proved to have an in-plane magnetic easy axis and a low Curie temperature of 17 K,which will limit its application in spintronic devices.In this work,we propose a new Janus monolayer Cr_(2)Cl_(3)S_(3) based on the first principles calculations.The phonon dispersion and elastic constants confirm that Janus monolayer Cr_(2)Cl_(3)S_(3) is dynamically and mechanically stable.Our Monte Carlo simulation results based on magnetic exchange constants reveal that Janus monolayer Cr_(2)Cl_(3)S_(3) is an intrinsic ferromagnetic semiconductor with TC of 180 K,which is much higher than that of CrCl_(3) due to the enhanced ferromagnetic coupling caused by S substitution.Moreover,the magnetic easy axis of Janus Cr_(2)Cl_(3)S_(3) can be tuned to the perpendicular direction with a large magnetic anisotropy energy(MAE)of 142eV/Cr.Furthermore,the effect of biaxial strain on the magnetic property of Janus monolayer Cr_(2)Cl_(3)S_(3) is evaluated.It is found that the Curie temperature is more robust under tensile strain.This work indicates that the Janus monolayer Cr_(2)Cl_(3)S_(3) presents increased Curie temperature and out-of-plane magnetic easy axis,suggesting greater application potential in 2D spintronic devices.

Magneto-Photo-Thermoelastic Excitation Rotating Semiconductor Medium Based on Moisture Diffusivity

In this research,we focus on the free-surface deformation of a one-dimensional elastic semiconductor medium as a function of magnetic field and moisture diffusivity.The problem aims to analyze the interconnection between plasma and moisture diffusivity processes,as well as thermo-elastic waves.The study examines the photothermoelasticity transport process while considering the impact of moisture diffusivity.By employing Laplace’s transformation technique,we derive the governing equations of the photo-thermo-elastic medium.These equations include the equations for carrier density,elastic waves,moisture transport,heat conduction,and constitutive relationships.Mechanical stresses,thermal conditions,and plasma boundary conditions are used to calculate the fundamental physical parameters in the Laplace domain.By employing numerical techniques,the Laplace transform is inverted to get complete time-domain solutions for the primary physical domains under study.Referencemoisture,thermoelastic,and thermoelectric characteristics are employed in conjunction with a graphical analysis that takes into consideration the effects of applied forces on displacement,moisture concentration,carrier density,stress due to forces,and temperature distribution.

Low-Cost and Biodegradable Thermoelectric Devices Based on van der Waals Semiconductors on Paper Substrates

We present a method to fabricate handcrafted thermoelectric devices on standard office paper substrates.The devices are based on thin films of WS_(2),Te,and BP(P-type semiconductors)and TiS_(3)and TiS_(2)(N-type semiconductors),deposited by simply rubbing powder of these materials against paper.The thermoelectric properties of these semiconducting films revealed maximum Seebeck coefficients of(+1.32±0.27)mV K^(-1)and(-0.82±0.15)mV K^(-1)for WS_(2)and TiS_(3),respectively.Additionally,Peltier elements were fabricated by interconnecting the P-and N-type films with graphite electrodes.A thermopower value up to 6.11 mV K^(-1)was obtained when the Peltier element were constructed with three junctions.The findings of this work show proof-of-concept devices to illustrate the potential application of semiconducting van der Waals materials in future thermoelectric power generation as well as temperature sensing for low-cost disposable electronic devices.

Functional Confirmation Using a Medical X-Ray System of a Semiconductor Survey Meter

In recent years, semiconductor survey meters have been developed and are in increasing demand worldwide. This study determined if it is possible to use the X-ray system installed in each medical facility to calculate the time constant of a semiconductor survey meter and confirm the meter’s function. An additional filter was attached to the medical X-ray system to satisfy the standards of N-60 to N-120, more copper plates were added as needed, and the first and second half-value layers were calculated to enable comparisons of the facility’s X-ray system quality with the N-60 to N-120 quality values. Next, we used a medical X-ray system to measure the leakage dose and calculate the time constant of the survey meter. The functionality of the meter was then checked and compared with the energy characteristics of the meter. The experimental results showed that it was possible to use a medical X-ray system to reproduce the N-60 to N-120 radiation quality values and to calculate the time constant from the measured results, assuming actual leakage dosimetry for that radiation quality. We also found that the calibration factor was equivalent to that of the energy characteristics of the survey meter.