丙烯酸氨基甲酸酯树脂热性能的研究

用测定在不同升温速率下ＴＤＩ／ＰＰＧ（２０００）／ＨＥＡ体系ＵＡ齐聚物固化物热失重曲线的方法研究了ＵＡ树脂固化物的热分解动力学，测定了分解活化能，讨论了ＵＡ树脂固化物在氮气气氛中程序升温时的分解反应，用ＴＧ和ＤＴＡ方法研究ＵＡ和ＵＭＡ树脂固化物的热稳定性表明，ＵＭＡ比ＵＡ树脂固化物的起始分解温度高，加入稀释剂（ＭＭＡ或ＥＧＤＭ）可提高ＵＡ树脂固化物的热稳定性。     

麦秸与塑料复合间的热反应分析

运用差示扫描量热法(DSC)测定和分析了乙烯-醋酸乙烯(EVA)、聚乙烯(PE)、聚氯乙烯(PVC)塑料与麦秸之间的热反应特征.结果表明:麦秸与乙烯-醋酸乙烯树脂复合后的人造板DSC曲线中出现了两个吸热峰,其熔点与乙烯-醋酸乙烯树脂的熔点有差别.分析玻璃化转变温度(Tg)时发现:麦秸与乙烯-醋酸乙烯树脂复合后的人造板在DSC曲线中的Tg已很难确定,而乙烯-醋酸乙烯树脂的Tg温度范围比较明显,为33.4～50.5 ℃.麦秸与聚乙烯树脂复合后的人造板在DSC曲线中出现的熔点与聚乙烯树脂的熔点有所差别.同样以吸热峰的顶点为熔点,则前者的熔点约为131.5 ℃,后者的熔点约132.9 ℃.通过积分可知,前者的吸热量为后者的93.3%.聚氯乙烯树脂的Tg接近70℃,而在麦秸与聚氯乙烯树脂(PVC)复合后的Tg很难确定.此外,两种材料的熔点也有较大差别.聚氯乙烯树脂在DSC曲线中,出现一个吸热峰,熔点约为86.0℃;而麦秸与聚氯乙烯树脂复合后的人造板的吸热峰有两个,熔点明显不同.应用熔点和玻璃化转变温度这两项高分子材料的重要指标对麦秸与EVA、PE、PVC之间的热反应特征进行分析,可以了解它们之间的反应状况.     

ULTRASONIC FREQUENCY SHIFT OF STIMULATED BRILLOUIN SCATTERING STUDIED BY AN OPTICAL HETERODYNE METHOD

ＵＬＴＲＡＳＯＮＩＣＦＲＥＱＵＥＮＣＹＳＨＩＦＴＯＦＳＴＩＭＵＬＡＴＥＤＢＲＩＬＬＯＵＩＮＳＣＡＴＴＥＲＩＮＧＳＴＵＤＩＥＤＢＹＡＮＯＰＴＩＣＡＬＨＥＴＥＲＯＤＹＮＥＭＥＴＨＯＤＧａｏＤｕｎｔａｎｇ１）ＬｅｉｄｅｒｅｒＰ２）（１）Ｄｅｐａｒｔｍｅｎ...     

MIXED BOUNDARY VALUE PROBLEM FOR SECOND ORDER SYSTEM OF DIFFERENTIAL EQUATIONS OF THE ELLIPTIC TYPE

ＭＩＸＥＤＢＯＵＮＤＡＲＹＶＡＬＵＥＰＲＯＢＬＥＭＦＯＲＳＥＣＯＮＤＯＲＤＥＲＳＹＳＴＥＭＯＦＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳＯＦＴＨＥＥＬＬＩＰＴＩＣＴＹＰＥＣｈｅｎＱｉｎｇｘｉａｎｇ（陈庆祥）（ＺｈｏｎｇｓｈａｎＵｎｉｖｅｒｓｉｔｙ，Ｇ...     

用正交法选初值求多元函数的最小值

用正交法选初值求多元函数的最小值石益祥　　　　　　　（基础课部）ＳＥＬＥＣＴＩＮＩＴＩＮＡＬＰＯＩＮＴＢＹＯＴＨＯＧＯＮＡＬＯＰＴＩＭＩＺＥＤＴＥＣＨＮＩＱＵＥＴＯＥＸＴＲＡＣＴＭＩＮＩＭＵＭＯＦＦＵＮＣＴＩＯＮＯＦＭＡＮＹＶＡＲＩＡＢＬＥＳＳｈｉＹ...     

MAGNETIC RELAXATION AT EARLY TIMES AND FLUX DIFFUSION BARRIER V（J，B，T） FOR Ti－1223 DOPED WITH Pb AND Ba BY COMPLEX AC SUSCEPTIBILITY MEASUREMENTS

ＭＡＧＮＥＴＩＣＲＥＬＡＸＡＴＩＯＮＡＴＥＡＲＬＹＴＩＭＥＳＡＮＤＦＬＵＸＤＩＦＦＵＳＩＯＮＢＡＲＲＩＥＲＶ（Ｊ，Ｂ，Ｔ）ＦＯＲＴｉ－１２２３ＤＯＰＥＤＷＩＴＨＰｂＡＮＤＢａＢＹＣＯＭＰＬＥＸＡＣＳＵＳＣＥＰＴＩＢＩＬＩＴＹＭＥＡＳＵＲＥＭＥＮＴＳＤ...     

农用三轮运输车动力输出装置的设计及机具配置的试验研究

农用三轮运输车动力输出装置的设计及机具配置的试验研究郑玉才，刘长荣，陈芳，杜青（河北农业技术师范学院农业工程系，昌黎，０６６６００）ＡＳＴＵＤＹＯＮＤＹＮＡＭＩＣＯＵＴＰＵＴＤＥＶＩＣＥＡＮＤＩＭＰＬＥＭＥＮＴＤＩＳＰＯＳＡＬＯＦＦＡＲＭＩＮＧＴＲＩ...     

LEAKY LAMB WAVES IN MULTI-LAYERED FLUID-SATURATED POROUS MEDIA IMMERSED IN LIQUID

ＬＥＡＫＹＬＡＭＢＷＡＶＥＳＩＮＭＵＬＴＩ┐ＬＡＹＥＲＥＤＦＬＵＩＤ┐ＳＡＴＵＲＡＴＥＤＰＯＲＯＵＳＭＥＤＩＡＩＭＭＥＲＳＥＤＩＮＬＩＱＵＩＤＺｈｏｕＹｕｆｅｎｇ１）ＷａｎｇＹａｏｊｕｎ１）ＭａＬｉ２）ＧａｏＴｉａｎｆｕ２）（１）Ｉｎｓｔｉｔｕｔｅ...     

三种磷酸盐类阻燃剂对脲醛树脂固化过程的影响

用差示扫描量热法（ＤＳＣ）研究了三种磷酸盐类阻燃剂（磷酸二氢胺ＭＡＰ、磷酸氢二铵ＤＡＰ和聚磷酸铵ＡＰＰ）对脲醛树脂胶粘剂（ＵＦ）固化反应起始温度、反应速度以及最终固化程度的影响。结果表明：（１）ＡＰＰ和ＭＡＰ可以降低阻燃胶粘剂的ｐＨ值，而ＤＡＰ则使ｐＨ值升高；（２）ＡＰＰ和ＭＡＰ可以降低ＵＦ胶固化反应活化能，使固化反应在较低的温度下开始，但相应的阻燃ＵＦ胶最终固化程度低于不加阻燃剂的ＵＦ胶；（３）     

乙烯利诱导黄瓜雌花分化机理初探(简报)

乙烯利诱导黄瓜雌花分化机理初探（简报）于凤鸣刘玉艳杨越冬（河北农业技术师范学院园艺系，昌黎，０６６６００）ＰＲＥＬＩＭＩＮＡＲＹＳＴＵＤＹＯＮＴＨＥＭＥＣＨＡＮＩＳＭＯＦＣＥＰＡＩＮＤＵＣＩＮＧＦＥＭＡＬＥＦＬＯＷＥＲＳＯＦＣＵＣＵＭＢＥＲＴＯＤＩＶ...     

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