分割式酒精精馏热泵的研究

根据酒精－水相平衡的特点，设计出用于酒精精馏的分割式流程，使得原来因塔顶与塔底温差过大而不能应用的压缩式热泵得以应用．计算表明，此时的热力学效率比常规精馏提高８２％．     

空分精馏过程的仿真计算

从Hamens物性方程出发，依据Or-Ar-N2三元物系气-液平衡关系，对通用模型塔建立统一的数学模型和求解方法，在此基础上开发了空分单塔及精馏系统的计算模型并对填料塔精馏过程进行了探讨和计算．通过宝钢5#空分精馏系统的模拟计算，说明该模型能够准确地描述精馏过程各参数变化．     

气体分馏装置丙烯精馏塔操作条件的优化

采用ASPEN PLUS流程模拟软件对气体分馏装置中丙烯塔的精馏过程进行计算机模拟。通过优化操作参数，使工艺条件得到优化，丙烯纯度达到99．6％以上。     

精密精馏板式塔的简捷设计

根据陈宁馨方程的近似解析解，导出了一个适用于精密精馏板式塔的简捷设计方程。利用该方程求出了２０种情况所需的理论板数并与陈宁馨方程的精确解比较，平均误差为２．８％。计算结果表明本文导出的方程可用于精密精馏板式塔的简捷设计。更为重要的是该方程可用于精密精馏最佳回流比的快速估算。     

高效高速波型挡板塔盘在化工生产上应用

阐述波型挡板塔盘气液两相接触流动,传热,传质的机理分析,该塔盘用于分离甲醇－水物系的甲醇回收等,已在全国８个化工厂推广应用了３１套塔装置,实践表明其生产能力大,可提高３０％－１００％;分离效果好,塔顶,塔釜液的质量控制指标为０．１％或０．０１％以下,回流比可减少３０％－５０％;弹性大,压降小,不易堵塔,操作稳定易调节控制;节能降耗,经济效益显著,可在化工,石油化工等的精馏,吸收,洗涤除尘冷却等单元     

丙酮-氯仿混合物萃取精馏分离过程模拟

为增大关键组分的相对挥发度以有利于分离,用苯作为溶剂对流量为78.788 88 kmol/h的丙酮-氯仿混合物进行萃取精馏过程的模拟计算。精馏流程采用两塔结构,即萃取精馏塔和溶剂回收塔,前者塔顶馏出产物为丙酮,塔底产物为氯仿、苯和微量丙酮的混合物;后者塔顶馏出产物为氯仿,塔底为溶剂苯和少量氯仿,此塔底产物作为回流与补充溶剂合并返回萃取精馏塔。萃取精馏塔总共65块理论板(包括塔顶全凝器和塔底再沸器),补充溶剂(0.410 76kmol/h)和新鲜进料合并从萃取塔第30块理论板加入(从上往下数),回流比为10,塔顶产物42.84kmol/h;溶剂回收塔共有70块理论板(包括塔顶全凝器和塔底再沸器),进料位置为第30块,回流比为15,塔顶产物与进料流量比设为0.11。模拟计算结果收敛,结果萃取精馏塔顶产物中丙酮纯度为99.95%,溶剂回收塔顶氯仿含量达到97.87%。     

低温低压下H_2－N_2－Ar体系汽液平衡研究与应用

介绍了空气分离装置带精氩塔工艺流程中Ｈ２－Ｎ２－Ａｒ体系汽液相平衡计算的数学模型，根据实验数据，将Ｓｏａｖｅ方程中的参数ａＨ２进行了回归。经与大量实验数据比较，表明本文改进的Ｓｏａｖｅ方程对低温低压下Ｈ２－Ｎ２－Ａｒ体系汽液相平衡计算的精度较高，本文还用Ｓｏａｖｅ方程首次对精氩工艺流程、精氩塔的精馏工况及分凝器的热力参数等进行了计算，结果均较满意。     

带有中间贮罐塔的混合溶剂间歇萃取精馏

采用一个带有中间贮罐的间歇精馏实验塔，对混合溶剂间歇萃取精馏过程进行了实验研究．实验结果表明，带有中间贮罐的间歇萃取精馏过程在很长一段时间内具有塔顶采出产品，同时具有在塔底采出混和溶剂的特点，因而与常规间歇萃取精馏过程相比，带有中间贮罐塔时间精馏技术需要的再沸器体积大大减小．另外，混合溶剂萃取精馏过程与简单溶剂萃取精馏过程相比，克服了简单萃取剂自身选择性与溶解性之间的矛盾，提升了萃取精馏工艺的分离效果及使用范围，并且没有增加原有工艺过程的复杂性．     

低温低压下H2—N2—Ar体系汽液平衡研究与应用

介绍了空气分离装置带精氩塔工艺流程中Ｈ２－Ｎ２－Ａｒ体系汽车液相平衡计算的数学模型，根据实验数据，将Ｓｏａｖｅ方程中的参数αＨ２进行了回归，经与大量实验数据比较，表明本文改造进的Ｓｏａｖｅ方程对低低压下Ｈ２－Ｎ２－Ａｒ体系汽液相平衡计算度较高，本言语文还用Ｓｏａｖｅ方程首次对精氩工艺流程，精氩塔的精馏工况及分凝器的热力参数等进行了计算，结果均较满意。     

铅塔锌精馏过程高温烟气供热控制模型及应用

为了研究铅塔锌精馏过程中高温烟气供给塔盘的允许传热量，基于质量守恒和能量守恒定律，建立了铅塔锌精馏过程高温烟气供热控制模型。此控制模型及应用结果表明，韶关冶炼厂铅塔燃烧室高温烟气允许传热量为782．4—1024．0kW，当低热值煤气中掺混液化气的比例不大于1．0％时，能够满足单塔生产能力增强的要求，如超出此范围来增大供热量，将造成含镉锌质量下降，甚至导致铅塔冲顶现象出现。该控制模型不但能够揭示锌精馏过程中铅塔锌精馏系统的输入、输出关系，便于铅塔内部信息正确输出，而且为铅塔的结构设计、锌糖馏过程的整体优化与实时控制提供理论依据。     

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