单螺杆挤压机生产率计算模型的验证与修正

通过对采用粘性剪切流动理论推导建立单螺杆食品挤压机生产率模型 ,进行了仿真求解 ,并对运算结果进行了实验验证 根据对误差产生原因的分析 ,对生产率计算模型进行了修正 ,并借助对生产率修正模型的仿真进行数据的回归 ,得出了更直观的生产率回归模型     

单螺杆挤压机生产率计算模型的验证与修正

通过对采用粘性剪切流动理论推导建立单螺杆食品挤压机生产率模型,进行了仿真求解,并对运算结果进行了实验验证,根据对误差产生原因的分析,对生产率计算模型进行了修正,并 助对生产率修正模型的仿真进行数据的回归,得出了更直观的生产率回归模型。     

全要素生产率测定方法综述

生产率分析是探求增长源泉的主要工具，同时也是确定增长质量的主要方法。自二战以后，国际上生产率研究的重点从偏要素生产率转向全要素生产率，标志着现代生产率问题研究的开始，笔者回顾 全要素生产率研究的国内外现状，对研究的状况进行了简要评述，提出了对我国全要素生产率研究的几点启示。     

高技术产业全要素生产率的差距及影响因素研究

运用DEA-Malmquist指数,测度了1996—2010年中国大陆30个省市高技术产业全要素生产率的变化和差距,并对其影响因素进行了分析。研究表明:技术进步在各地区差异明显,但各地区全要素生产率的增长具有趋同的趋势。相比东部地区,中西部地区技术效率对全要素生产率的推动作用更为明显。从全要素生产率的影响因素来看,科技活动人员、对外开放水平对全要素生产率的影响为正,市场化程度对全要素生产率的影响为负,研发强度、政府管理水平对全要素生产率的影响并不显著。     

知识经济条件下信息生产要素的生产率

知识经济时代,信息已经成为一种最重要的生产要素。本文提出应该把信息作为一种生产要素来研究,并对其生产率进行测度。运用生产率度量的生产函数法,分离计算出全要素生产率和包括信息要素在内的各要素在产值增长中的贡献率,并由此得出了信息要素生产率的计算公式,避开了信息要素生产率测算中遇到的收益周期长、收益外溢而引起的信息要素投入的收益测算难题,使对信息要素生产率的宏观测算变得简单易行。     

重庆市工业生产率的测定及分析

在工业经济中,生产率是衡量一个生产系统运行效能的最基本的指标,生产率测定是生产率管理的第一步.在改革开放的巨大推动下,重庆工业经济保持了稳定的增长,文中运用随机前沿生产函数法测定了重庆市1979-1999年的工业生产率,并对其发展趋势进行了分析.     

西藏经济增长中的全要素生产率分析

全要素生产率的增长是反映经济增长效率的重要注解,对全要素生产率增长源泉的分解随着人们对经济增长的认识深化和经济计量分析工具的发展在不断深入。文章从经济增长源泉、全要素生产率分解和计量方法等层面对全要素生产率增长进行了理论分析,并以西藏经济总量和产业结构为例进行了实证研究,认为西藏经济维持长期持续增长的一个重要政策取向应该是进一步加强人力资源的积累。     

柔性制造系统性能的评价

运用“系统总生产率PS”对柔性制造系统设计方案进行了评估。结果表明,采用柔性度高的数控机床构成FMS可获得较高生产率。最后,通过实例进行了验证。     

知识员工生产率提高的障碍及对策——以A软件集团为例

如何对知识员工进行有效管理以提高其生产率,是一个复杂的问题。这里从知识员工的特征出发,分析了知识员工生产率提高的外部影响因素,提出了四条提高知识员工生产率的对策。第一,通过"组织参与"的角色定位,获得参与权;第二,通过弹性工作制度,全方位考察生产率;第三,实施360度绩效评估措施,促进组织知识共享;第四,建立灵活知识团队,形成动态学习单元。最后,给出了A软件集团知识员工提高生产率的具体措施和方法。     

基于VAR模型对土地生产率与农业劳动生产率关系的实证分析

以武汉城市圈为研究对象,对武汉城市圈1993年以来的土地生产率和农业劳动生产率关系进行了实证研究。土地生产率和农业劳动生产率存有长期协整关系,土地生产率的变化对农业劳动生产率有比较明显的影响,并且具有一定的滞后性。     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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