高精度频率型集成化温度传感器的研制

介绍一种高精度频率型集成温度传感器，２．５～３Ｖ电源，３２～４４℃温度范围内测温精度为±０．１℃，特别适合于生物医学测温使用．集成芯片的频率输出信号可以直接送微处理器．文中还提出了可重组和参数可调的集成传感器的多功能设计     

光学法诊断发动机燃烧过程的实验研究

研制了一个用于发动机燃烧过程监测和分析的光电测量系统，包括一个以镀膜蓝宝石棒为传感头的光纤燃烧传感器，一套以光电倍增管ＰＭＴ为光探测器的检测电路和一套数据采集分析系统．应用这个系统在一台汽油机上进行了实际测量．实验表明，光学法可以准确地测出发动机燃烧过程的时间参数，从光强变化曲线可以得到混合气均匀性和燃烧循环波动之间的关系     

基于BP网络的热力系统参数仿真

针对热力系统的传感器损坏率较高,导致有些分析软件失效的现状,提出了一种改进ＢＰ算法的人工神经网络,对一些重要的热力参数进行了仿真研究．在该方法中,网络学习过程通过同时调整学习率和动量修正因子两个参数,使得收敛速度沿着最佳方向进行．经实例计算结果表明,真实值和仿真值之间的误差在１％以内,可以满足工程应用的需要．文中最后给出的在调峰机组的寿命管理系统中的应用实例,对动力系统的热力参数在线仿真、减少传感器的维护量,尤其是提高基于参数采集的应用软件的可靠性具有较大的参考价值     

光纤传感器光源温度特性研究

光纤传感器光源温度特性研究周伟明，丁洪斌，戚兵，王艺（物理系）关键词温度控制；稳定性；半导体制冷；光纤器件分类号：ＴＨ７４１．１光纤压力传感器是一种新型压力传感器，这种传感器在石油、化工等领域具有广泛的应用前景￣［１］．该传感器的发射机是以中心波长为...     

钻井定向测量系统数学模型

在井筒或井下钻具定位的测量中，航空航天工业的加速度传感器和磁能门传感器被用于几千米深的井下，检测精度高，工作可靠．本文用矢量分析法信推导了两种用于井身轨迹检测的电子仪器的测量模型，较详细地说明了表征并身轨迹空间姿态的一些特些参数之间的关系．     

曲面环式轴承向心力传感器

轴承载荷能反映它支承的机械的载荷，是机器的性能研究和自动控制中很有用的一个参数．轴承向心力传感器是获取轴承载荷信号的一个关键元器件．本文推荐了一种曲面环作为轴承向心力传感器．它的结构简单紧凑，便于安装，有较广泛的应用范围．文章介绍了这种环的结构，用计算和试验检测了它的性能，并通过计算机模拟试验分析了它的结构参数对测试性能的影响．     

内外环电容传感器灵敏度仿真

为设计应用于两相流相关流速测量的电容传感器,得到传感器的几何参数对其灵敏度特性的影响,利用数值方法对内外环电容传感器的灵敏度特性进行分析．利用有限元分析软件建立传感器电场的仿真模型并进行了基本仿真,采用正交实验设计方法安排仿真实验．分析结果表明,屏蔽罩长度和内管壁厚度是影响传感器相对灵敏度的主要因素,而屏蔽罩与外极板间距对检测场均匀性误差影响比较大．优选出一组传感器的结构参数,内管壁厚度3mm,外管壁厚度2mm,屏蔽罩与外极板间距3mm,对管壁相对介电常数的要求则是越接近于1越好．利用优选的结构参数进行仿真,可以得到比较好的传感器灵敏度特性,为内外环电容传感器的设计提供了理论依据．     

基于遗传神经网络的苹果气味识别方法研究

提出一种根据苹果气味对苹果进行无损检测的新方法，介绍一套适合苹果气味检测的电子鼻系统，阐述该系统识别苹果气味的过程．对超市所购的好坏苹果各50个进行了检测，在获得传感器阵列数据的基础上，从每个传感器曲线中提取了5个特征参数，该参数作为模式识别的输入向量．用主成分分析法和遗传神经网络对所测的样本进行分析，主成分分析的结果是能较好地区分好坏苹果，遗传神经网络对训练集的回判正确率和对测试集的测试正确率分别为100％和96，4％，试验证明该方法和电子鼻装置对苹果质量进行评定是有效的，同时也可以用于其他水果的检测，     

基于表面等离子共振传感器的COVID-19检测与药物评价

自新冠病毒发现以来，新冠肺炎在社会内引起广泛关注，其传播能力相较于其他冠状病毒具有更高的传染性和致病性，在世界范围内对人类的生命财产安全造成了巨大的危害．灵敏检测和早期诊断是实现新冠病毒COVID-19有效阻隔和治疗的关键环节，传统的PCR等技术目前已被应用于COVID-19的诊断与检测当中，但其仍存在着定量困难、耗时长、成本昂贵等缺点．表面等离子共振(SPR)传感器是一种高灵敏、无标记和快速的实时分析工具，可用于特定蛋白质、核酸和病毒粒子的定量检测，在COVID-19检测中发挥着重要作用．本文综述了基于不同检测方法，包括直接法、间接法、夹心法在内的SPR传感器对COVID-19的定量检测与诊断研究进展，对固定配体进行分类，研究目标分子包括COVID-19的核酸分子、抗原、抗体及病毒粒子．同时，也从传感器设计、表面修饰、检测性能等方面对SPR传感器进行了介绍，总结了SPR传感器针对COVID-19检测的开发方向、目前存在的问题及可以采取的措施．另外，SPR传感器可以通过其独特的亲和力动力学分析实现分子间KD值的计算，对SPR传感器在COVID-19潜在药物评价方面的应用及作用机制进行了...     

传感器故障在线诊断和信号恢复的两级神经网络方法

目的研究控制系统中传感器软硬故障诊断和信号恢复．方法提出一种两级神经网络（ＮＮ）包括一个主神经网络和若干个局部神经网络方法．主神经网络负责诊断传感器故障,其输入为各传感器在时刻ｔ的信号,输出为各传感器在时刻ｔ＋１的信号．各局部网络负责传感器故障诊断和信号恢复．每一个局部网络对应一个传感器,局部神经网络输出为相应的传感器在时刻ｔ＋１的信号,其输入为其余传感器在时刻ｔ的信号．各网络均采用先学习,后工作的在线学习方法．结果与结论所述方法具有在线学习、故障误检率低、可以诊断多个传感器软硬故障的优点．对气垫船中传感器软硬故障诊断的仿真结果表明,该方法是行之有效的．     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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