低压舱专用人体呼吸流量测试系统研制

研制低压舱特殊气压条件下的人体呼吸体积流量测试设备。设计以气体质量流量传感器、气体压力传感器、温度传感器为核心的硬件,设计基于Lab VIEW平台的软件。进行了低压舱不同高度定标试验,进行低压舱不同高度验证试验。试验结果表明该设备在地面至6.9 km高度上正常运行,精度在±3%以内。低压舱专用人体呼吸体积流量测试系统能够在地面和低压舱不同模拟气压高度的低压变压环境中测量人体呼吸体积流量,能够满足低压舱高空试验的要求。     

电子脉冲式供氧装备供氧防护性能实验评价

运用环境模拟方法,了解和掌握新型供氧装备的防护性能。通过低压舱模拟不同的高空环境,机械肺模拟人体呼吸。其间利用脉冲式供氧装备对机械肺进行供氧。实验过程中,采集面罩内氧分压和氧浓度等数据,并对数据进行分析。实验结果表明,脉冲式供氧装备在供氧过程中,受高度和通气量影响较大。在较高高度上,供氧装备适应高度自动调整供氧量的性能,难以满足生理学要求。供氧装备操作繁琐,应在满足人体呼吸需求的基础上,予以简化。     

脉冲式供氧装备供氧防护性能评价与分析

运用环境模拟方法,了解和掌握新型供氧装备的防护性能。通过低压舱模拟不同的高空环境,机械肺模拟人体呼吸。其间利用脉冲式供氧装备对机械肺进行供氧。实验过程中,采集面罩氧分压、面罩氧浓度等数据,并对数据进行分析。实验结果表明, 脉冲式供氧装备在供氧过程中,受高度和通气量影响比较大。供氧装备适应高度自动调整供氧量性能不佳。供氧装备操作繁琐,应在满足人体呼吸需求的基础上,予以简化。     

凹叶景天的生理活性成分研究

采用自建保肝药物筛选新模型对中草药凹叶景天的生理活性部位进行跟踪测试,并对其生理活性成分进行了分离、鉴定.     

高效液相色谱-飞行时间质谱法区分黑色签字笔种类

采用高效液相色谱飞行时间质谱仪对黑色签字笔字迹中成分进行检测。应用甲醇：水(1：1,V/V)提取样品后,利用ESI正离子模式检测,采用差异组学方法提取每种样品中的特异离子,最后用SPSS软件主成分分析法分析。结果表明,24种样品均可有效区分。本研究的建立为签字笔种类区分和书写时间鉴定提供了新的方法。     

在线VOCs富集热脱附系统的研制及其应用

研制开发了一套用于提高在线VOCs检测质谱仪灵敏度的在线VOCs富集热脱附系统。系统基于快速、精确的控温模块,采用大流量持续进样、双通路预浓缩模块转换交替的工作模式,满足与VOCs在线检测仪器联用的需求,且可以与常规离线技术的联用。采用苯系物标准气体对该系统的工作条件、富集能力、稳定性等性能参数进行了测试,同时考察了该系统在室内空气VOCs组分检测中的应用。结果表明:在线VOCs富集热脱附系统与在线VOCs检测质谱仪联用后,方法灵敏度提升了两个数量级;其次,与单独使用在线VOCs检测质谱仪相比,在线VOCs富集热脱附系统与在线VOCs检测质谱仪联用后可有效提高环境空气样品中痕量VOCs组分的检测能力。该系统为痕量VOCs气体检测等领域提供了一项新的检测技术。     

航空活塞发动机高空模拟试验台温度系统研究

在航空活塞发动机高空模拟试验中,模拟温度低、温度范围跨度大,高空模拟试验台（简称高空台）上应用了空气制冷和电加热两种调温措施,控制难度较大。将模拟温度划分为高温、常温、低温三个温度段,分别应用三种不同的调节方式进行温度控制;在系统数学建模和温度变化动态特性分析基础上,对高空台温度系统的调节过程进行了仿真研究,结果表明该方法能够满足温度的调节速度和控制精度要求。为了满足带涡轮增压器的航空活塞发动机对进气温度的要求,建立了涡轮增压器与中冷器之间的数学换热关系,以稳态时的发动机进气温度为例进行了仿真计算,结果与     

微米铝粉活性及氧化膜厚度研究

提出了计算微米级铝粉平均氧化膜厚度的经验公式.使用SEM、气体容量法、激光粒度仪及质谱仪对两个系列共21种数均粒径的微米铝粉进行了形貌、活性铝质量分数、粒度分布与成分测试,分析了微米铝粉的数均粒径与其氧化膜厚度之间的规律.结果表明,微米铝粉的平均氧化膜厚度与数均粒径为指数关系,并存在一个与铝粉纯度相关的上限值.     

基于压电式压力传感器的压力容器气密性检测方法

针对低压条件下压力容器气密性检测中存在的微小泄漏检测易受环境噪声干扰、漏点定位困难、对气体介质具有选择性等问题,提出一种基于压电式压力传感器的压力容器气密性移动式检测方法。利用压电式压力传感器检测压力容器漏孔处产生的气体射流,克服了检测仪器对气体介质的选择性;采用气密性移动检测方式,利用检测用传感器可以接近压力容器器壁外表面的特点和仪表的实时计算能力,克服了环境噪声对检测结果的干扰,同时又提高了气密性检测的灵敏度和漏点定位精度,实现了低压条件下微小泄漏的检测。低压容器气密性检测的测试结果验证了所提方法的可行性和有效性,为压力容器的气密性检测提供了一种新的解决思路。     

潜油电泵试验台的总体设计

设计了一种大功率、双频率、高精度潜油电泵试验系统,分析了其测试原理,介绍了该系统电源的一次回路设计方法。应用结果表明,以低压真空断路器和空气断路器为中心,设计的低压供电部分,可满足试验系统频繁分和与保护的要求。采用多级测量电流互感器、电压互感器组成的测量系统,测量精度可满足电量B级的需要,使高压柜的设计大为简化。用普通变频器和专用正弦波滤波器、电抗器组成的60 Hz电源,在一定的范围内,可作为潜油电机的试验电源使用。分组设置的液力流程,可满足多种试验泵性能试验的需要。该系统经过3年多的运行表明,试验精度可达B级试验台的要求。     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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