标准信号的无线发射与接收转换装置

本文阐述了一种基于通讯技术和传感器技术的无线传感器装置的设计方法,主要由ADuC824单片机、PTR8000无线收发模块、HS162-4型液晶显示嚣组成。用户可以通过该装置对不宜布线的场所进行远程检测及监控。     

不同测试条件对羊毛／莱卡包芯纱拉伸性能的影响

通过正交试验，分析拉伸速度、夹持长度、纱线线密度TF等因素对羊毛／莱卡包芯纱拉伸性能的影响．实验结果表明，影响纱线拉伸断裂强度程度大小依次为纱线线密度、拉伸速度、夹持长度；同种线密度的羊毛／莱卡包芯纱，在相同拉伸速度的条件下，随着夹持长度的增大，羊毛／莱卡包芯纱的断裂强力减小；在相同拉伸速度的条件下，包芯纱的断裂伸长率随着夹持长度增大而减小．     

赛络纺复合纱线结构及其拉伸力学模型

在对赛络纺复合纱线工艺、组分特点以及结构分析的基础上,从复合纱线组分纤维的拉伸性能着手,结合有关短纤维纱和股线的结构力学经典理论,计算并建立了非对称复合纱线的理论拉伸方程,并用几种组分纤维及其复合纱线性能参数的实验结果与理论拉伸方程进行了验证,两者的结果相符,利用此模型很容易计算并预测在既定成纱参数下的赛络纱线力学性能,并进一步揭示了赛络纺复合纱线的结构机理和拉伸性能之间的内在联系.     

双向拉伸下的纬平针织物线圈形态分析

采用二维线圈结构模型,计算纬平添纱针织物的针编弧、圈柱和沉降弧在双向拉伸下的长度变化,进而分析线圈形态变化和纱线转移情况.实验结果表明:在横向拉伸、纵向高度不变的双向拉伸下,圈弧长度增加,圈柱长度减少,纱线由圈柱向圈弧转移;在纵向拉伸、横向宽度不变的双向拉伸下,圈弧长度减少,圈柱长度增加,纱线由圈弧向圈柱转移.理论结果和实验结果具有较好的一致性,表明此二维线圈结构模型可以用于分析和预测纬平针织物在双向拉伸下线圈形态变化和纱线转移.     

预型加工过程中玻璃纤维纱线损伤原因的试验分析

玻璃纤维纱线在预型加工过程中很容易受到损伤，发生毛丝、断头等问题，严重影响复合材料预型件的加工和性能。通过对玻璃纤维纱线的拉伸、弯曲拉伸以及摩擦性能的测试和比较，发现虽然玻璃纤维具有高模量、高强力等优点，但是其耐弯曲和耐摩擦性能很差：弯曲拉伸时强力下降了40％～60％，而摩擦情况下如果要使玻璃纤维纱线能承受上百次的摩擦，纱线所能承受的张力还不到其断裂强力的2％．因而，弯曲和摩擦是造成玻璃纤维纱线预型加工损伤的主要原因．     

基于AE技术与HHT的环锭纱拉伸断裂过程研究

在常规纱线拉伸强力仪上采用自主搭建的声发射检测系统,分别采集涤纶长丝和环锭纱在拉伸破坏过程中的声频,利用Matlab软件编制Hilbert-Huang transform(HHT)程序对采集的信号进行分析与处理,以获取纱线拉伸过程中各破坏源的时频特征。分析结果表明,AE信号经HHT可识别涤纶环锭纱拉伸过程所涉及的纤维断裂和纤维滑移2种模式,其特征频率分别为30,20kHz和6,3kHz,本研究为纱线拉伸断裂机理的分析和进一步的延伸研究提供一种有效方法。     

耐久压烫整理纯棉织物的撕破性能

纯棉织物免烫整理后,拉伸、撕破强力下降,严重影响了织物的耐用性.通过研究免烫整理前后织物的拉伸和撕破强力、纱线的强力和伸长率、交织阻力、形态结构,分析影响撕破强力的因素.研究表明,纱线结构、强力以及伸长率对撕破强力有显著影响.强力和伸长率高的纱线织成的织物被撕破时受力三角区大,共同受力的纱线根数多,撕破强力高;组织结构、经纬纱密度影响纱线间的交织点及滑移情况.交织点少,纱线间滑移容易的织物的撕破强力高.     

织造和染整加工前后精梳毛纱拉伸性能的关系

为了根据织造前纱线的拉伸性能和织造、后整理工艺预测织物的拉伸性能,研究了织造和染整加工前后精梳毛纱拉伸性能的关系,获得了三方面的结论:(1)经常规后整理加工的各种精梳毛织物中经纱的伸长变形能力没有显著差异,但其纬纱的伸长变形能力与织造和染整工艺有关。(2)坯布染色情况下织造前纱线的伸长变形曲线在伸长率方向扩大一定倍数以后与织物中纱线的伸长变形曲线相当。纱线染色情况下织造前纱线的伸长变形曲线的某一部分与织物中纱线的伸长变形曲线相当。(3)后整理加工中的经向张力和拉幅张力对精梳毛织物中纱线的伸长变形能力的影响特别大。树脂整理有降低织物变形特别是变形回复能力的作用。     

钼粉还原自动化生产线装料称重装置的设计

针对钼粉还原炉自动化生产线的工艺需求,设计了一种装料称重刮平与现场控制为一体的钼粉自动化装料称重装置。详细论述了该装置的机构组成及工作原理,并以ADuC824单片机为主控单元、EPM7128为逻辑信号处理单元构建完整的软硬件测控单元平台,设计制作了相应的部件单元和软件程序,并进行了现场试运行实验。实验结果表明,该称重装置重复性测量精度标准差为1.5 g,最大相对误差为0.11%,达到了钼粉还原炉自动化生产线所要求的称重误差控制要求。     

聚己内酯取向纳米纤维纱线的制备及其织物的拉伸性能

以可生物降解的聚己内酯(PCL)为原料,以三氟乙醇(TFEA)为溶剂,采用改进的静电纺丝(静电纺纱)技术成功制备了PCL取向纳米纤维纱线.研究了不同静电纺纱工艺参数(溶液浓度、电压、纺丝距离)对PCL纳米纤维纱线的制备以及形态的影响.选定较优的纺纱工艺参数:溶液质量浓度为0.10g/mL,纺丝电压为9kV,纺丝距离为20cm,以该纺纱参数制得PCL纳米纤维纱线,其平均直径为180μm,内部纤维的平均直径为600nm,且纳米纤维沿着纱线轴向高度取向排列.将PCL纳米纤维纱线应用于传统纺织技术,以PCL取向纳米纤维纱线为纬纱,以聚乳酸(PLA)微米长丝为经纱,制备平纹织物小样.将该平纹织物和PCL纳米纤维膜的拉伸性能和孔径分布进行对比分析,结果表明:平纹织物纳米纤维纱线方向的拉伸性能明显高于PCL纳米纤维膜的拉伸性能;另外,与PCL纳米纤维膜相对比,PCL纳米纤维纱线的平纹织物具有大孔径结构,更有利于细胞生长,进一步表明其在组织工程领域具有广阔的应用前景.     

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     

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