新型HMX基耐热炸药性能研究

为克服高分子粘结耐热炸药药柱尺寸变化导致石油射孔弹药型罩反弹的弊病,西安近代化学研究所研制了一种不含高分子黏结剂的HMX基耐热炸药。按照GJB 772A—97和GB/T 20489—2006对其性能进行了研究,结果表明:其撞击感度为40%,摩擦感度为28%;密度为1.694 g·cm-3时,抗压强度为7.84 MPa;密度为1.807 g·cm-3时,爆速为8 709 m·s-1,高于H781炸药;真空安定性和耐热性能与H781炸药相当;平均穿深较H781高出5%。     

金属硫化物-高分子复合微球的控制合成研究

以P(NIPAM-co-20%MAA)高分子凝胶微球为模板,成功制备了CuS-P(NIPAM-co-20%MAA)硫化铜-高分子复合微球材料.研究表明,复合微球呈现出较为粗旷、清晰的表面结构,且发现其表面形貌受控于硫代乙酰胺(TAA)在酸性介质中缓慢分解释放H2S气体的速率.研究为可控合成金属硫化物-高分子复合微球的表面形貌提供了一条可能途径.     

超细RDX爆轰感度与撞击感度、摩擦感度的研究

采用纯超细RDX与工业RDX ,以及以超细RDX和工业RDX为主体、采用相同配方和制备工艺制取的高分子粘结炸药对比的方式 ,在相同的实验条件下 ,对撞击感度、摩擦感度、爆轰感度进行了测试和研究 ,得出超细RDX无论是纯品还是高分子粘结炸药 ,其撞击感度、摩擦感度均低于工业RDX ,而爆轰感度优于工业RDX的结论。     

改性高氯化聚乙烯高分子材料的研制与应用

高氯化聚乙烯 (HCPE)是一种耐化学腐蚀的高分子材料 .改性后的高氯化聚乙烯高分子材料是以高氯化聚乙烯为主体 ,辅以增塑剂、除锈剂和钛合金等辅料改性 ,并经过科学工艺研制而成的新型防腐涂料 .该新产品具有耐强酸、强碱、盐水和盐雾等化学介质的腐蚀 ,特别是抗老化性能达到国家标准 (GB T14 5 2 2 -1993)的 5倍 .     

杨毅等高分子化学实验课开设初探

高分子化学实验课的重点是实验内容，在专业基础相对薄弱，教学资源相对贫乏的条件下，合理选择实验内容是开设高分子化学实验的关键所在。在既能保证教学效果，又能调动学生的积极性、主动性和创造性的前提下，提出了实验内容选择的原则，并在此原则指导下，制定了以四个实验为基础的实验课教学计划，包括高吸水树脂聚丙烯酸钠的制备，甲基丙烯酸甲酯的本体聚合，苯乙烯的悬浮聚合和聚乙烯醇缩甲醛的制备。     

高分子化学实验课开设初探

高分子化学实验课的重点是实验内容,在专业基础相对薄弱,教学资源相对贫乏的条件下,合理选择实验内容是开设高分子化学实验的关键所在。在既能保证教学效果,又能调动学生的积极性、主动性和创造性的前提下,提出了实验内容选择的原则,并在此原则指导下,制定了以四个实验为基础的实验课教学计划,包括高吸水树脂聚丙烯酸钠的制备,甲基丙烯酸甲酯的本体聚合,苯乙烯的悬浮聚合和聚乙烯醇缩甲醛的制备。     

PETN为基挠性炸药在精细装药中的应用

选用PETN炸药为主体炸药、室温硫化甲基硅橡胶为粘接剂,研制出了一种挠性混合炸药。该混合炸药具有临界直径小,直径效应弱等特点,适用于小直径装药技术(如爆炸逻辑网络技术的装药)。介绍了具体的混药工艺、原理,分析了影响工艺的主要因素,实际测定了该混合挠性炸药在基板方形沟槽中爆轰传播的临界截面积和直径效应(D～1/S)。     

PBX9501炸药冲击响应的物质点法模拟

采用Uintah计算程序中的物质点方法对PBX9501炸药的冲击响应进行了细观数值模拟.基于PBX9501的细观显微图像建立了相应的二维计算模型,并通过以固定速度运动的活塞对炸药进行冲击加载.模拟结果表明,冲击加载下在炸药颗粒边界出现较大的塑性应变,随后,塑性应变能转化为热能,导致颗粒边界区域温度急剧升高形成热点.文中还研究了冲击波强度对炸药冲击响应的影响,发现随着冲击波强度的增加塑性应变和温升分布并未发生明显改变,但是塑性应变和温升的值都大幅增加.也就是说,冲击波强度越大,导致的热点温度越高.     

LC-MS技术及其在炸药检测方面的应用

简述了液相色谱-质谱(LC-MS)联用技术的特点及发展,以及电喷雾电离(ESI)、大气压化学电离(APCI)两种最常用LC-MS接口的特点.重点介绍了LC-MS用于不同炸药检测的最新进展.LC-MS可以很好地应用于爆炸后土壤植物残体等复杂介质中的炸药分析.尽管大多数炸药的蒸汽压较低,但具有热不稳定性,在传统的气相色谱进样口高温下易发生分解.而LC-MS技术恰恰非常适合分析相对强极性和热不稳定的化合物.     

高热震稳定性红外辐射节能涂料的制备与性能

以MnO2、Fe2O3、CuO、Co2O3等过渡金属氧化物为原料,经高温固相反应形成具有尖晶石结构的红外辐射粉料,并进一步与莫来石高温焙烧制备复合红外辐射粉料,然后与硅酸盐粘接剂混合制备了高热震稳定性的红外辐射涂料.对材料的结构、理化性能以及耐热震稳定性进行了研究,结果表明:所制备的具有尖晶石结构的红外辐射粉料和复合红外辐射粉料均具有优良的红外辐射性能,室温全波段辐射率分别为0.91和0.90,各个波段内的法向辐射率均在0.92以上;涂覆复合红外辐射涂料后,高铝砖的辐射吸热和热交换能力明显增加,600℃时蓄热能力提高4.99%,1200℃时蓄热能力提高20.98%;复合红外辐射涂料的膨胀系数和基体膨胀系数匹配性较好,具有良好的耐热震稳定性.     

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