冬奥会雪蜡车电交互方法研究

为服务北京冬奥会,助力科技冬奥,2020年11月6日中国重汽集团承接了国家体育总局关于研制中国首台雪蜡车的任务。本文介绍了一种北京冬奥会雪蜡车电交互方法,将雪蜡车动力电池、燃料电池、光伏发电装置、工业电源的用电交互,低温下动力电池加热系统可以反向从工业电源取电,没有市电时,厢体用电器可以从动力电池取电,实现雪蜡车在复杂多变的环境下保持可靠的供电。

基于脑电信号的人机交互实验平台的设计和应用

基于脑电信号(electroencephalogram,EEG)的人机接口研究是目前国内外研究热点之一,本文针对脑电信号在强噪声背景下微弱的特点,讨论了基于脑电信号的低功耗、移动式、开放接口的人机交互实验平台系统的设计方法和应用。综合利用先进的硬件和软件滤波技术、隔离技术、高速通用串行接口技术以及虚拟仪器技术来提高平台各方面的性能。将此平台用于脑电诱发信号提取得到了满意的结果,从而为基于脑电信号的开放性人机交互平台的实现提供了新的思路,为脑电信号的研究带来了方便。

睿眼随心——渐冻人脑电辅助交互系统

针对传统人机交互方式无法从根本上解决渐冻症患者的语言沟通问题,文中设计了一款渐冻人脑电辅助交互系统——睿眼随心。系统基于稳态视觉诱导的脑电波检测技术,采用Neuroscan脑电读取设备捕捉大脑脑电信号,创新设计了牛顿环和棋盘格稳态视觉刺激范式,能够准确快速地诱导出大脑视觉区相应脑电信号,实现通过脑电进行人机交互。经验证,该系统使用方便,无需训练,准确高效,较好地满足了使用者的需求。

汽车电商平台交互设计的研究与实现

随着近年来互联网产业高速发展,淘宝京东等大型电商平台的兴起,越来越多的行业开始建设自己的线上平台,人们开始更多的重视产品的视觉设计和人机交互的用户体验。以此通过对汽车电商平台的交互分析,包括界面与图标的设计与应用,达到人机的完美结合。

基于EMC的智能用电系统框架分析

基于AMI高级量测体系、智能电网和实时电价,在EMC能量管理系统的基础上,优化构建更加完善合理的售电用电框架。将传统用电策略和基于EMC的智能用电系统家庭能源网关进一步推动改善,发展成为基于EMC的智能售用电系统框架,售用电系统框架的改革将为提升电网效率发挥重要作用。

浅析互动电视的发展历史

互动电视作为一项新兴产业,正处于发展的黄金时期。本文通过对互动电视的发展历史的回顾,以及对其在发展进程中的得失分析,理出了互动电视的发展脉络,总结了互动电视发展的经验教训,以期对未来的互动电视发展起到借鉴作用。并得出结论,所有成功的互动电视范例都是因为,1.互动服务符合观众的需求;2.节目与传统电视相比有着明显的互动特征;3.观众的经济能力可以接受。因此,再先进的技术只有跟整体的社会经济环境相匹配,才可能发扬光大。同时本文也指出,电视向互动电视的转化是符合媒体发展的一般规律的,因而也是必然的。

综合能源背景下的配电网规划研究

对综合能源系统进行优化是适应可持续发展战略的内在要求,本文以综合能源背景下的配电网规划研究为主题,围绕综合能源下的电力与其他能源相结合的现实状况,展开对电力系统与其他能源系统间联合配电网络规划的探讨,以求为相关规划的实际应用提供理论借鉴。

电商流行趋势下视觉传达设计师的培养研究

随着线上平台的迅猛发展,线上视觉传播的形式也可以更加丰富,那么视觉传达设计专业的培养可以根据这些丰富的投放媒介而有所重点培养。软件界面设计过程中产品的功能创新是需要交互设计师与产品经理以及后台搭建编程的技术人员共同努力而完成的,交互设计师不仅能对电商平台的视觉整体布局做大的规划,大到电商平台的框架中的入口的风格,小到销售的产品图片展示的大小规范,都可以通过设计师进行前期的设计而成型。在电商APP发展的过程中应该着重在视觉引导和交互设计中下足工夫,视觉设计专业的学生在专业学习中,应该侧重于对视觉引导的图形设计和交互设计中的各种效果的学习熟练,并能够在教学中启发学生对界面设计中的交互创新效果的思考。要想宣传自己的产品必然要花费巨额的宣传费用,那么好的外部引流资源图就是宣传效果成功与否的关键,在这一部分视觉设计师的工作则极为重要。设计环节既要考虑资源图投放的位置的整体板式风格和环境因素,也考虑广告区域的大小和投放时长,在设计的环节对于品牌和品牌痛点的展示考量尤为关键,设计细节中广告文案的字数、字符大小、品牌宣传的整体调性都需要不断修改和把控。

Additional transition induced by magnetoelectric interaction in ferroelectromagnet Pb(Fe_(1/2)Nb_(1/2))O_3

Besides the two phase transitions known in ferroelectromagnets, an additional transition was observed experimentally in Pb(Fe1/2Nb1/2)O3 and the possible mechanism was explored. The magnetic moment shows that anomalous increases when the temperature goes down away from the Néel temperature of 20-30 K. The existence of the hysteresis verifies the weak ferromagnetic property. This additional phase transition is considered to originate from the magnetoelectric coupling between the ferroelectric and antiferromagnetic orders in this compound. From the M?ssbauer parameter analysis, it is confirmed that the hybridization of the O 2p, Fe 3d and Nb 4d electron states makes the realization of magnetoelectric coupling possible.

Effect of electromagnetic interaction on microstructure and corrosion resistance of 7075 aluminium alloy during modified indirect electric arc welding process

The effects of applying an electromagnetic interaction of low intensity (EMILI) on the microstructure and corrosion resistance of 7075-T651 Al alloy plates (13 mm in thickness) during modified indirect electric arc (MIEA) welding were investigated. The welding process was conducted in a single pass with a heat input of ~1.5 kJ/mm. The microstructural observations of the welds were correlated with the effect of EMILI on the local mechanical properties and the corrosion resistance in natural seawater by means of microhardness measurements and electrochemical impedance spectroscopy, respectively. Microstructural characterization of the welds revealed a grain refinement in the weld metal due to the electromagnetic stirring induced by EMILI of 3 mT during welding. In addition, observations in the scanning electron microscope showed that the precipitation of Cu-rich phases and segregation of eutectics were reduced in the heat affected zone (HAZ) also as an effect of EMILI. The high corrosion dissolution of the 7075-T651 welds in natural seawater and the extent of overaging in the HAZ were reduced when welding with EMILI of 3 mT. Thus, EMILI along with the MIEA technique may lead to welded joints with better microstructural characteristics, improved mechanical properties in the HAZ and reduced electrochemical activity.

Effects of Electron-Phonon Interaction on Linear and Nonlinear Optical Absorption in Cylindrical Quantum Wires

The electron-phonon interaction influences on lineax and nonfineax optical absorption in cylindrical quantum wires （CQW） with an infinite confining potential axe investigated. The optical absorption coefficients are obtained by using the compact-density-matrix approach and iterative method, and the numerical results are presented for GaAs CQW. The results show that the electron-phonon interaction makes a distinct influence on optical absorption in CQW. The electron-phonon interaction on the wave functions of electron dominates the values of absorption coefficients and the correction of the electron-phonon effect on the energies of the electron makes the absorption peaks blue shift and become wider. Moreover, the electron-phonon interaction influence on optical absorption with an infinite confining potential is different from that with a finite confining potential.

A Mechanism of the Effect of Non-uniform Current on the Spectrum of Short Wind Waves

A mechanism is suggested in this paper concerning the effect of non-uniform current on the spectrum of short wind waves. According to this mechanism, a non-uniform current brings changes to the breaking criteria of short wind waves through modulating the surface drift, and hence enhances or weakens wave breaking. Some modification is proposed to the source term, which represents the spectral rate of wave energy dissipation due to wave breaking so that the source term can incorporate this mechanism. In order to illustrate whether this mechanism is significant, a real case is studied, in which the wind waves propagate on a tidal current flowing over the sea bottom covered with sand waves. Finally, the effect of the new mechanism on the equilibrium spectrum of small scale gravity waves is discussed. Numerical estimates suggest that, for water depths less than 50 m and wavelengths less than 1 m, this current field may result in distinct spatial variations of the wave breaking criteria, the spectral rate of wave energy dissipation and the equilibrium spectrum of short gravity waves.

Molecular Dynamics Simulation for the Effect of Chain Length of Spacer and Tail of Cationic Gemini Surfactant on the Complex with Anionic Polyelectrolyte

Interaction of anionic polyelectrolyte with cationic gemini surfactant has been investigated by coarse-grained molecular dynamics simulation.Polyelectrolyte facilitates the oppositely charged ionic surfactants to aggregate by suppressing the electrostatic repulsion between ionic head groups leading to the formation of micellar complex.With addition of surfactant,the conformation of polyion chain changes from stretched to random coiled to spherical,and at the same time more free micelles are formed by surfactants in mixtures.Increasing the length of spacer or tail chain in gemini surfactant will weaken its interaction with polyelectrolyte and simultaneously strengthen its tendency to self-assemble.The simulation results are consistent with experimental observations and reveal that the electrostatic interaction plays an important role in the interaction of polyelectrolyte with gemini sur- factant.

Effects of electrical parameters and their interactions on plasma electrolytic oxidation coatings on aluminum substrates

Based on orthogonal experiments,the effects of voltage,frequency,duty ratio and their interactions on the thickness and corrosion resistance of coatings prepared by plasma electrolytic oxidation(PEO)on aluminum in an alkaline silicate-containing electrolyte were investigated.The thicknesses of these coatings were obtained by measuring their cross-section using Image J software.Their corrosion resistances were evaluated in HCl and NaCl media through spot test and electrochemical test.The results show that the experimental design of this study is the key to investigate the interactions among these electrical parameters.Additionally,not only each independent factor,but also their interactions exhibit a remarkable influence on the coatings.The combination of high voltage,low frequency and large duty ratio significantly increases the coating thickness and content of the corrosion resistance phase,and thus improves the corrosion resistance of the coating in HNO3 medium.Conversely,the coating possessing the densest microstructure and best corrosion resistance in NaCl medium is obtained when low voltage and high frequency match with a small duty ratio.

A Two-Electron Quantum Ring Under Magnetic Fields

We calculate the energy levels of low-lying states of a two-electron quantum ring under the influence of perpendicular homogeneous magnetic field. Calculations are made by using the method of exact diagonalization within the effective-mass approximation. The ground-state electronic structures and angular momentum transitions as a function of the strength of a magnetic field have been revealed.

An Analytical Approach to Thermal and Electrical Transport in a Mesoscopic Conductor

In order to consider the thermal and electrical coherent transport in a mesoscopic conductor under the influence of electron-electron interaction, in this paper, we establish a method in terms of which one can analytically obtain the Hartree self-consistent potential instead of computing it by the numerical iterative procedure as usual, which is convenient for us to describe the thermal and electric current flow through a mesoscopic conductor. If we study the electron-electron interaction at the Hartree approximation level, the Hartree potential satisfies the Poisson equation and Schroedinger equation, so when we expand the action function S（x） by Planck constant h, the self-consistent potential and the wavefunction can be solved analytically order by order, and the thermal and electrical conductance can thus be obtained readily. However, we just show the quantum corrections up to the second order.

Acoustic-electrical properties and rock physics models for shale-oil formations:prediction of reservoir properties of interbedded sandstone and shale layers

In recent years,the Yanchang shale-oil formations of the Ordos Basin are rich in reserves with complex lithology and structure characteristics,low porosity and low permeability,and weak anomalies for oil and water discriminations,have been the key targets of unconventional oil/gas resource exploration and development in the relevant areas.The joint acoustic-electrical(AE)properties can be used to interpret reservoir lithology,mineralogy,pore structure,and fluid saturation.To conduct tests of thin section analysis,X-ray diff raction,and ultrasonic and electrical experiments at diff erent pressures and saturation degrees,cores from the shale-oil formations in the Q area of the basin are collected.The variations in AE properties with respect to clay content,porosity,pressure(microfracture),and saturation are analyzed.The experimental results indicate that the rock physics behaviors of sandstones with diff erent clay contents vary significantly.The AE properties of clean sandstones are basically dependent on the microfractures(pressure),while for muddy sandstones,the clay content is an important factor affecting the responses.The target reservoir consists of interbedded sandstone and shale layers.The AE equivalent medium equations and the Gurevich theory are applied to establish the joint models for the diff erent lithologies and simulate the variations in AE properties with respect to fluid type,pore structure,and mineral components.The three-dimensional joint templates of clean and muddy sandstones,as well as shale,are developed based on the elastic and electrical attributes and then calibrated using the experimental and well-log data.The reservoir properties are estimated with the templates and validated by the log data.The results indicate that the joint templates based on lithology characteristics can eff ectively characterize the properties of interbedded sandstone and shale layers.Furthermore,the combined application of AE data provides more beneficial information for the assessment of rock properties,leading to precise estimates that conform with the actual formation conditions.

Modeling and analyzing of nuclear power peer review on enterprise operational efficiency

Based on the practice and analysis of peer review in nuclear power plants, the models on the Pareto improvement of peer review, governance entropy decrease of peer review are set up and discussed. The result shows that the peer review of nuclear power is actually a process of Pareto improvement, and of governance entropy decrease. It’s a process of improvement of the enterprise operational efficiency accordingly.

Improved Ligand-Field Theoretical Calculations of R-Line Thermal Broadenings of MgO:Cr^(3+) and MgO:V^(2+)

With the values of parameters obtained from improved ligand-field theory,by taking into account all theirreducible representations and their components in EPI as well as all the levels and the admixtures of basic wavefunc-tions within d^3 electronic configuration,the R-line thermal broadenings(TB)of both MgO:Cr^(3+)and MgO:V^(2+)havemicroscopic-theoretically been calculated.The results are in very good agreement with the experimental data.It is foundthat the R-line TB of MgO:Cr^(3+)or MgO:V^(2+)comes from the first-order term of EPI.The elastic Raman scattering ofacoustic phonons plays a dominant role in R-line TB of MgO:Cr^(3+)or MgO:V^(2+).

矿用无线钻孔应力传感器设计

针对机械式钻孔应力计无法实时记录围岩应力数值,有线传感器在工作面回采过程中线缆容易被扯断,应力数据无法可靠、实时地上传的问题,该文设计了一种采用SmartMeshIP无线网络通讯技术和压电电阻检测原理的矿用无线钻孔应力传感器。详细介绍了电压检测及转换电路、数码管显示电路、人机交互电路、元件信号处理电路、报警电路、无线组网模块六部分硬件电路设计,各部分电路低功耗工作机制,电池电量计算与选型以及传感器的软件流程。现场应用表明,该传感器实现了无线自组网数据传输及低功耗运行,能够保证在不换电池的情况下工作1年以上。