FDI对东道国就业的影响

以我国制造业1985—2007年数据为基础,研究FDI对我国就业的影响。研究结果表明,外商直接投资的增加将降低国内就业水平;国内资本存量变化是影响资本收益率的重要因素,国内资本存量变化对就业的影响取决于外商投资企业资本存量和内资企业资本存量的综合比较;我国劳动力供给,特别是非技术劳动力供给缺乏弹性。     

成本视角下FDI的区位选择与产业转移

建立一个由跨国公司和东道国企业所构成的寡头垄断的产量竞争模型,基于此模型分析了成本因素对外商直接投资(FDI)在东道国的投资区位选择与撤资的影响.外商直接投资的区位选择受聚集经济和成本因素的共同影响,在聚集经济效应相同时,成本因素将显著地影响FDI的区位选择:成本优势越大的地区,对FDI的吸引力越大,FDI的可能聚集规模也越大;当区位成本提高时,对成本变化敏感的FDI将从其聚集地撤资.当前中国应尽快在中西部地区建立承接中心,使外资撤减变为外资在我国境内的转移.     

宁波FDI技术溢出效应的实证分析

FDI的技术溢出效应引起了理论界广泛关注,但现有研究认为FDI对不同地区的作用不一定相同。文章以宁波为例,根据柯布-道格拉斯生产函数建立衡量技术溢出效应的数学模型,利用宁波市相关数据,对其FDI技术溢出效应进行了实证分析。研究结果表明：宁波外商直接投资对本地经济产生了负面技术外溢效应,其原因在于宁波企业主要以劳动密集型为主,技术水平较低,与跨国公司差距大,自身技术吸收能力低。为此,文章从调整引资结构、促进内外资企业联动发展等方面提出了提升宁波FDI技术溢出效应的若干建议。     

中国未来经济增长新亮点:从“引进来”到“走出去”——来自PVAR模型的新证据

利用中国各行业2004-2011年的数据,采用PVAR模型,研究FDI、对外直接投资与经济增长之间的互动关系,捕捉各变量在面对冲击时的长短期效应。结果表明:对外直接投资对经济增长的推动效应显著优于FDI;FDI与对外直接投资存在一定的互补关系,但不够显著;对外直接投资与经济增长相互间的短期效应显著优于长期效应,对外直接投资与FDI相互间的长短期效应是非对称的,无论是长期还是短期,FDI与经济增长并非存在显著的长期互动关系。     

FDI、劳动力需求弹性与就业效应

在理论分析FDI与劳动力需求弹性关系的基础上,利用2000—2008年间中国外资企业省级面板数据和固定效应模型,就FDI对中国劳动力市场的影响进行研究。结果显示:FDI对劳动力需求弹性具有显著的影响,即改变劳动力与其他生产要素(资本与中间产品)的替代效应来对劳动力需求弹性产生作用,进而影响到劳动力市场的雇佣关系、就业风险和工作稳定性。     

FDI对上海制造业集群作用的研究

随着经济全球化,外商直接投资飞速发展,跨国公司在全球范围内的活动更加频繁。然而,跨国公司直接投资的发展推动了东道产业集群的发展,促进了集群的升级。本文结合上海制造业集群的现状,分析FDI对上海制造业集群作用机理,最后总结了上海由FDI推动制造业集群存在的问题。     

FDI与城市化水平的相关性分析——以江苏省地级市为例

为了研究对外直接投资(FDI)与城市化水平的关系,利用社会统计学软件SPSS对江苏省13个地级市FDI与城市发展的相关数据进行相关性分析处理.分析结果表明:FDI与城市化水平的相关性存在明显的地域差异,存量上的FDI对于城市发展的促进作用要大于增量上的FDI对城市发展的促进作用.     

创新产出的空间效应及影响因素研究 ——基于海峡西岸经济区面板数据的分析

利用空间Moran指数和Moran散点图以及空间面板滞后模型,对2010—2014年海峡西岸经济区20个城市创新产出进行空间计量分析,结果表明:海峡西岸经济区创新产出存在明显的空间效应。通过对创新产出影响因素分析得出:研发经费投入、研发人员投入以及研发资本存量是形成创新产出空间效应的主要因素;此外,外商直接投资FDI对创新产出存在显著的负的挤出效应。     

服务业跨国公司的发展与母国就业

服务业跨国公司对母国就业的影响取决于对外直接投资之前母国企业的国际竞争力状况和对外直接投资之后对母国国内资本形成的影响两方面因素.服务业跨国公司可以创造或维持一部分母国就业,提高国内就业人员的熟练程度和技能水平,从而有助于国内就业结构的优化.     

跨国公司研发投资对本土企业溢出效应分析

考察跨国公司在华研发投资,并就工业企业进行实证分析,结果显示跨国公司在我国研发投资均存在正溢出效应,东、中、西地区间溢出效应存在显著差异。本土企业与跨国公司的技术差距越大越不利用溢出效应的发挥;外资密集度越高溢出效应越明显;本土企业研发投入力度与溢出效应正相关,而跨国公司研发投入过高可能会产生逆向技术扩散。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

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 Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme