影响瞬态电磁生物效应实验重复性的要素

从瞬态电磁生物效应的特点出发，对影响其实验重复性的主要物理要素进行了分析，并运用量子理论推出了随着实验对象复杂程度的增加，瞬态电磁脉冲所产生的非热生物效应实验的重复性降低，从而得出提高实验重复性的3个方向，对研究生物系统内部复杂的相互作用而加以控制，又是其中更为重要的解决手段。     

试论非热电磁生物效应实验的重复性

根据生物代谢动态过程中的电磁干扰假说，用量子理论描述了非热电磁生物效应实验的重复性问题。结果表明，随着实验对象复杂程度的增加，非热生物效应实验的重复性降低。研究生物系统内部的复杂相互作用并加以控制，是解决提高实验重复性的重要手段。     

瞬态电磁脉冲对细胞跨膜电位的影响

我们初步研究了瞬态电磁脉冲的非热生物效应,取得了第一手实验数据,为进一步探索其机理提供基础［１］．低强度瞬态电磁脉冲非热效应的源发点为细胞膜,脉冲对细胞跨膜电位的影响是导致其生物效应的原因之一［２］．所以需要了解电磁脉冲激发的细胞跨膜电位,以及瞬态电磁脉冲特性对跨膜电位的影响．我们采用简化的细胞电学模型计算得到不同特性的瞬态电磁脉冲对细胞跨膜电位的影响,结果具有普遍指导意义．１　简化的细胞电学模型　　在实验系统中,电磁脉冲的频率范围不是很宽,采用的细胞种类也有限,可以统一采用简化的细胞电学模型进…     

无标记生物检测中微悬臂层合梁的纳米热机变形

以无标记生物检测引起的探针挠度为未知量,放弃单向受力假设,建立了在杂交表面应力和热载荷作用下生物探针纳米力学行为的连续介质力学层合梁模型.分别采用线性和均匀温度场模拟了生物探针在生物化学反应中的瞬态和稳态温度分布,从而解释了Fritz有关DNA分子杂交实验中的双金属效应.     

增压柴油机瞬态过程NOx排放测试实验

在瞬态过程重复性良好的柴油机实验台架上，利用自行开发的采样机构和计算机测量系统，测试了某型号涡轮增压柴油机在突加速，突加载等瞬态过程中的NOx排放规律。实验结果表明，柴油机在瞬态过程中的NOx浓度变化规律与瞬态历程密切相关。当加速过程中扭矩较小时，NOx排放呈现先后升降的波峰型式；而在典型的突加速，突加载过程中，NOx浓度先下降后上升，后期又呈下降趋势。这些变化规律与NOx的生成机理相吻合。     

不同封装的扩展电阻温度传感器瞬态热响应模型

研究了扩展电阻温度传感器的封装效应。对扩展电阻传感器封装热阻的测量和瞬态热响应 理论和实验研究。理论结果和实验结果吻合。实验和理论结果表明，管壳的几何形状比封装材料传感器瞬态响应时间的影响更重要。对于要求高灵敏度和快速响应的传感器封装，小型和球型的封装方式总是被推荐。的     

基于瞬态激励的感应电机转子位置检测

为解决感应电机低速和零速时的转子位置跟踪问题,提出一种电流瞬态响应二次测量结果相叠加获得转子位置的检测技术.利用逆变器产生的脉冲作为激励信号,通过瞬态电流响应得到可反映转子位置信息的寄生效应特征.讨论了逆变器馈电时瞬态激励转子位置检测的数学模型,针对脉宽调制(PWM)恒压源逆变器馈电时存在的死区效应、负面效应等负面非理想特性的影响;通过仿真手段分析了逆变器死区效应对电流瞬态响应的影响,并给出相应补偿策略;采用改进型的双模滤波器,有效地抑制了负面效应引起的共模和差模dv/dt及瞬态电流波形畸变.在3 kW感应电机试验平台上进行了验证,结果表明瞬态电流检测结果具有可反映转子位置信息的寄生效应.     

电穿孔——解释生物体中非热生物效应的关键机理

介绍了细胞膜电穿孔的形成过程和基本应用，报道了瞬态电磁脉冲和生物细胞相互作用的一些重要实验结果。采用电穿孔机理解释了细胞膜破裂的原因。     

低强度瞬态电磁场脉冲作用于不同动物细胞形成电穿孔的实验比较

电穿孔是由电磁脉冲作用引起细胞或生物组膜半通透性暂时或永久性丧失出现穿孔的现象 .目前电穿孔技术已广泛应用于生物技术、基因工程及临床医学等很多领域 ,而其研究多集中于针对单个或数个瞬时高强度脉冲 (电场强度为 10 2 ～ 10 3ｋＶ/ｍ ,脉冲作用时间一般为 10 - 6 ～ 10 - 3ｓ)作用下细胞或组织膜的穿孔现象 ,与此相关的机理分析及实验研究已较为详尽[1～ 4 ] .近 10年来 ,我们一直致力于弱电磁场的非热生物效应的研究 ,并采用电场强度几ｋＶ/ｍ、脉冲宽度几个ｎｓ～ 10 0ｎｓ的低强度瞬态电磁脉冲对生物样品进行照射实验 ,结果发现…     

生物可降解能源器件及其应用

植入式瞬态电子器件由可降解材料构建而成,这些电子器件能够在体内降解并吸收,无需二次手术取出,避免了长期植入产生的负面效应。作为一个新兴的研究领域,植入式瞬态电子器件在体内传感和治疗方面都有着巨大的潜能。然而,大多数植入式瞬态电子器件的正常工作都需要外部能源供给,这极大限制了它们在体内的应用。因此,一种具有生物相容性、可控降解和生物可吸收的新式生物可降解能源器件,成为了植入式瞬态电子器件的迫切需求。介绍了4种生物可降解能源器件(生物可降解原电池、光伏电池、超级电容器和摩擦纳米发电机)及其应用,并探讨了各自所面临的挑战和未来发展趋势。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with