双半环的粗糙性质

在双半环上引入了粗糙集并研究了粗糙子双半环,利用双半环的非空子集上关于同余关系的上、下近似,给出了双半环的粗糙子双半环的定义,证明了双半环的子双半环一定是双半环的子双半环,理想一定是粗糙理想。     

半群的完备模糊双理想

在半群的广义模糊双理想和模糊双理想概念的基础之上,给出了半群的完备模糊双理想、双-半群、模糊双-半群的概念,并且从模糊点的角度研究其相应的性质.进一步地,得出了广义模糊双理想成为模糊双理想,一个半群成为模糊双-半群的等价条件以及双-半群和模糊双-半群之间的相互关系.     

双半环簇的拟强半格

研究了乘法左正规双半环的结构,且证明了这种双半环是乘法左零双半环的拟强半格,并得出这种双半环和含幺双半环的直积是Lz-双半环的拟强半格.     

有机磷化合物的合成研究

以金属锂和三苯基膦为起始原料,合成了8种有机膦化合物,即双二苯基膦甲烷dppm,双二苯基膦乙烷dppe,双二苯基膦丙烷dppp,双二苯基膦丁烷dppb,双二苯基膦戊烷dppr,双二苯基膦乙烯dppey,二苯基膦吡啶dppy,双二苯基膦乙烷之氧化物dtpeo,讨论了反应时间、温度、溶剂等对产率的影响,总结出一套合成含膦有机化合物的有效方法。     

半群的带限度（λ，μ）-双极值模糊双理想

将双极值模糊集应用于半群,引入了半群的带限度(λ,μ)-双极值模糊双理想和(λ,μ)-双极值模糊广义双理想的概念,讨论了半群的(λ,μ)-双极值模糊(广义)双理想的基本性质.分别给出了半群的(λ,μ)-双极值模糊双理想与模糊双理想及半群的双理想的关系.证明了半群的(λ,μ)-双极值模糊(广义)双理想的交和直积仍是半群的(λ,μ)-双极值模糊(广义)双理想.     

矩形Clifford双半环的性质与结构

利用双半环的分配格和带双半环,将左双环和左Clifford双半环进行推广,得到了矩形双环和矩形Clifford双半环的概念。给出了矩形双环和矩形Clifford双半环的刻画,得到了矩形Clifford双半环在一定条件下的织积分解以及矩形Clifford双半环是矩形双环的强分配格的充分必要条件。     

天津市“双创”金融现状及对策研究

2018年,天津市"双创"金融指数综合排名居全国第11位,整体"双创"金融发展略有下降;在"双创"金融机构和"双创"金融服务方面具有优势,尤其是金融机构数量位于全国第5位;在"双创"金融绩效、"双创"金融政策和"双创"金融生态方面较其他城市缺少竞争力,尤其是"双创"金融政策位居全国第26位。文章基于中国31个主要中心城市的"双创"金融指数比较分析,提出天津市"双创"金融未来发展的对策建议。     

双半环簇的强右正规带

研究了正规的型A-幂等双半环的结构,且证明了这种双半环是左零幂等双半环的强右正规带,并得出了这种双半环和含幺幂等双半环的直积是型A-左幂等双半环的强右正规带的结论.     

左Clifford双半环的性质与结构

定义了双半环的分配格和带双半环。利用这两个定义以及左Clifford半群的性质,给出了左双环和左Clifford双半环的定义,并得到了双半环是左双环的充分必要条件和双半环是左Clifford双半环的充分必要条件。     

谷氨酸衍生物螯合剂的合成和性能

以谷氨酸钠与二乙二醇双甲酸酯双酰氯制备新型螯合剂二甘醇双甲酸酯双酰谷氨酸,通过傅里叶变换红外光谱仪(FT-IR)和质谱仪(MS)对其结构进行表征.考察谷氨酸钠与二乙二醇双甲酸酯双酰氯摩尔比、水与二氯甲烷的体积比等对反应的影响,得到较合适的反应条件为谷氨酸钠与二乙二醇双甲酸酯双酰氯的摩尔比2.1∶1、水与二氯甲烷体积比1...     

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