证券投资组合的风险与收益权衡

针对证券投资者来说,如何选择正确的股票,使其得到更多的收益,是广大投资者最关心的问题,也是最感兴趣的重要课题,证券投资过程中影响因素有许多,会带来机遇也会带来不同程度的风险,而证券投资组合产生的主要目的是为了降低投资风险,获得最大的经济效益,本文通过对证券投资组合进行详细概述并对证券投资组合风险与收益进行研究,对证券投资组合风险与收益权衡采取必要的策略,有效弥补证券投资组合的不足,优化证券投资方案,为中小投资者提供有价值的投资参考资料。     

均值-VaR投资组合模型研究

VaR（Value at Risk）是一个在当前的金融市场条件下，测量各种不同的风险，确定投资的获利的重要方法。本文提出了VaR估计并提出新问题，即假设给定一个可接受的VaR，如何确定一组给定证券的组合投资的最大收益，并且同时满足VaR的约束条件；假设市场条件是变化的，如何在保证的投资组合下，在给定的VaR范围内，获得一个投资重组（重新平衡）策略，使其在一系列投资组合中相应的收益最大。为了解决这些问题，我们采用并进一步发展了一种算法来处理这些投资组合的优化问题。     

基于外部性与经营期电价的风电经济性研究

风电的外部影响主体主要包括环境、电网和用户。将外部成本和收益内部化是研究风电经济性的前提条件。考虑了风电的减排效益及对电网备用的影响,基于经营期电价,测算其在预期收益下合理的上网电价,并提出经济发电利用小时数概念,为研究风电投资可行性提供参考。结果表明,在综合考虑内外部成本和收益的前提下,在目前技术条件下,风电合理的上网电价与我国现行风电标杆电价一致,仍高于常规能源电价。结果证明了方法的有效性。     

套利定价模型在上海股票市场的无效性检验

1952年，Markowitz在《投资组合选择》一文中指出分散投资可降低风险，并在投资者理性预期的基础上提出了投资组合选择理论，即在有效边界的风险和标准差给定水平上，投资者选择期望收益率最高的资产组合。1959年，Roberts和Osbeme在对股票价格行为研究中发现股票价格遵循随机游走规律，提出了“有效市场假说”(EMH)：如果有用的信息能够立即地、无偏地反映证券价格，那么市场就是有效的。在市场有效条件下，     

加强风电统一规划和协调开发

本刊记者：国内风电产业近几年快速发展,有数据显示我国风电装机产能已经出现过剩,对此您如何评价？周鹤良：风电产业符合目前低碳经济产业的要求,是目前安全、环保、最具发展潜力、技术成熟的新能源行业。目前我国电力面临结构的调整,要降低化石能源,增加新能源比重,包括水电、风电和核电,发展风电非常符合科学发展观,风电属于朝阳产业,有非常广阔的前景。     

上海国资布局新能源喜忧参半

自去年5月底上海发力推动新能源等九大领域高新技术产业化以来，上海国资在核电、风电、太阳能、IGCC、智能电网等新能源领域的布局渐成规模。     

券商理财产品新走向：高票息 低风险

券商集合理财产品的前三季度“成绩单”逐渐浮出水面，近半数产品处于亏损状态的成绩，并不让人十分满意。随着市场低符的持续，低市场风险、稳健收益的投资需求越来越强烈，券商为了迎合低风险投资者的需求，开始关注固定收益类理财产品。在券商发行的理财产品中，权益类理财比重正在逐步降低，债券类等风险较低的类保本型产品大受欢迎，券商集合...     

银行投资组合管理模型初探

<正> 银行投资组合管理的一般分析 对于银行来说,在运营资本规模既定的条件下,要取得最优的经营效益,就是确定最优投资组合问题。在选择投资组合时,银行必须考虑的因素包括:投资项目的风险及其衡量;项目的收益及其衡量;风险与收益如何进行结合、比较,进而构建出投资群,再根据银行自身的投资偏好确定最优投资组合。     

促进风电开发利用效率为目标的风电电价机制

近年来,风电装机容量迅速增加,因风电行业各利益主体间不能有效分摊风险、共享利益,而产生了严重的"弃风弃电"、基础设施建设落后的问题,降低了风电行业开发利用效率。本文利用机制设计理论设计新的电价机制解决以上问题。在新电价机制中,引入峰谷折算系数提高发电企业的风电质量,同时设计了阶梯式电价机制推进输配电基础设施建设。推导了新机制下发电企业与电网企业追求利益最大化的函数表达式,当两者收益函数同时取得极大值时,新机制满足激相容。最后,利用DEA-Malmquist分析法对新电价机制是否能促进风电开发利用效率进行实证研究,结果表明新电价机制提高了风电开发利用效率。     

企业年金的投资组合策略分析

企业年金资产组合投资是重要的决策,本文在分析各类投资组合工具基础上,以案例探讨企业年金的资产配置及根据条件变化可采取的优化调整,结论是预期收益上升,投资风险降低,满足企业年金组合投资的目标要求.     

On the Major Transformation of the Asia-Pacific Regional Structure北大核心CSSCISSCI

Recent years have witnessedsignificant changes in the Asia-Pacific regionalstructure featuring the shift in power balance among related countries as well as adjust-ments in their respective regional strategies. So what is the prevailing trend in thistransformation and what kind of regional order will likely emerge in the future？ To an-swer these questions, the paper tries to explore the following dimensions： the evolvingregional context, shift in power balance and power conversion, geo-political and geo-e-conomic developments and interactions between them, and evolving regional order. Asthe study shows, the broadening of regional geographical scope, the rise in the numberof actors involved, as well as changesin the relations among them, have combined tocast a pluralistic and complex flavor to the regional structure. While the power balanceamong China, the United States and Japan shifts, and power conversion is also occur-ring. China and Japan are paying increasing attention to their security roles, whereasthe United States under the Obama administration laid more stress on expanding itsgeo-economic clout. In spite of the intensifying geopolitical competition among China,the United States and Japan in recent years, a Sino-US strategic compromise-whichholds the key to regional geopolitics-isother front, some kind of geo-economicmore likely to take place in the future. On thecooperation will probably emerge. In the longerterm, it will be the geo-economic trend thatwill prevail over the geopolitical trend inthe region. Finally, the future evolution of regional order wiI1 mainly follow the eco-nomic logic, accompanied by the dilutionof its hegemonic and hierarchical nature.Hence, a pluralistic and complex regional community will emerge.     

Organization and incentives in the age of sail

The British Navy in the age of sail was the most successful bureaucracy of its time. Its organization and incentive structures differed importantly from contemporaneous private sailing ventures, but closely resembled those of today’s large corporations. To induce efficient effort, the navy used a hierarchical tournament, in which sailors competed for higher pay that came with promotions based on relative performance. Promotion probabilities, the option value of future promotions, and the higher effort required of men in higher ranks and on larger vessels, combined to yield a highly skewed pay structure.     

The German Hanse and Bergen – new perspectives on an old subject

Abstract

The Hanseatic League and her kontors (trading posts) were an integral part of the medieval trade system in Northern Europe. Hanse merchants dominated many markets in this region and managed to maintain a monopoly-like role in towns like Novgorod and Bergen for many centuries. Consequently, one focus of historical research about the Hanseatic League lay on the mechanisms that enabled the Hanse merchants to keep that strong of a position for such a long time.

This article is part of the discussion about this topic. Based on Lübeck merchants with business interest in the Norwegian town of Bergen, the so-called Bergenfahrers (Bergen travellers), it will give new insights into the Hansards' economical and social organization. The three main points are (a) the integration of the Bergen market in the Hanseatic trade network as an intermediary trading place on the vivid East–West route of Hanse trade; (b) the importance of the Bergenfahrers within the Hanse merchants' economical, social and political networks; and (c) the structure of the Bergenfahrers network patterns in the late Middle Ages.

In addition to new insights into the important role of Bergen and the Bergenfahrers within Lübeck's and the other Wendish Hanse towns' trading system, this articles provides further proof for the usefulness of the methods of Social Network Analysis in medieval economic research.     

Financial Reporting and Trade Credit: Evidence from Mandatory IFRS Adoption*

We investigate the effect of mandatory IFRS adoption on trade credit. We document that firms in countries that adopt IFRS receive more trade credit from their suppliers, consistent with improved financial reporting quality and comparability playing a role in facilitating informal financing. This increase is larger for countries with a low level of societal trust, a poor pre‐IFRS‐adoption information environment, and stronger legal enforcement. These cross‐sectional results suggest that the conditions under which higher‐quality information is made publicly available affect suppliers' decisions to provide trade credit. This increase is also larger for firms with greater exposure to foreign markets, a finding that highlights the importance of more comparable international financial reporting standards in facilitating cross‐country trade credit. We also find that IFRS adoption has a stronger positive effect on trade credit for firms with greater liquidity needs. Finally, we find that firms in countries that adopt IFRS also extend more trade credit to their customers. Overall, our results support the notion that financial reporting can have a causal effect on trade credit.     

区域工业产业竞争力指标体系的构建及其评价方法研究

文章通过建立省级区域工业产业竞争力评价指标体系,设计竞争力模型,利用SPSS统计软件,对各省工业产业竞争力进行了评价测定。     

Penetration and Post-infection Development of Meloidogyne Incognita on Tobacco as Treated by Rhizobacteria Pseudomonas Fluorescens Strain P-72-10

The bio-control potential of rhizospere bacteria Pseudomonas fluorescens against plant-parasite nematode had been demonstrated. P. fluorescens had shown the effect to enhance tobacco resistance to root-knot nematode Meloidogyne incognita. Inoculation with P. fluoreseens in tobacco could lead to significant reductions in the number of juveniles that penetrated tobacco root and further life stage development of the juveniles. The number of juveniles penetrated into tobac- co root in treatment with P. fluorescens is significantly different from CK at 2DAI, 6DAI, 8DAI and 10DAI. Significant reduction and delayed development of juveniles that penetrated into tobacco root and treated were observed in treatment at 14DAI, 21DAI, 28DAI and 35DAI. In addition, P. fluoreseens treatment leads to a significant reduction in the number of eggs per egg-mass at 35 DAI. The results show P. fluorescens induced a continuously suppression on root-knot nema- tode M. incognita throughout their entire early infection phase of root penetration, subsequent life stage development and reproduction.     

文化传播中电视暴力对青少年侵犯行为的影响

伴随当代传媒产业的蓬勃发展,暴力也成为影视艺术基本的叙事类型及消费主义文化日趋盛行的现实语境。＂电视暴力＂是作为＂媒介暴力＂的一个子概念存在的;从文化传播看电视暴力,其覆盖面大,且易于接触;电视暴力对受众特别是青少年的影响巨大而深刻。要从制作者、传播者和观众三个方面的自律出发,建立适应我国国情的影视分级制。