浅谈超声非正式出版文献的获取和利用

收集和分析非正式出版文献,可以挖掘情报,了解竞争对手,预测技术发展方向。本文阐述了超声非正式出版文献的概念并提出了四种获取方法:搜索引擎检索、专业网站检索、网盘检索和间接获取。实践表明,以较少的投入获取了丰富的资料,通过分析将情报应用于科研、经营等。     

斜拉-刚构组合体系桥零号块空间应力分析

以河谷汉江公路大桥斜拉桥主桥部分作为依托工程,针对其零号块空间受力问题,采用有限元软件midas FEA建立零号块有限元模型并进行相应分析.以施工过程中成桥运营阶段最大弯矩工况、最大剪力工况以及施工阶段最大双悬臂工况为控制计算工况,分析3种工况下零号块最不利内力情况.研究表明,在现有的设计条件下,结构受力可满足规范要求,相应的设计细节可为类似的工程提供借鉴.     

会计第二报告体系的发展与设计研究

日益严峻的环境形势迫切要求企业披露更多的环境信息,但目前的环境信息披露现状难以满足社会要求,进行独立披露环境报告是当前发展趋势。本研究提出建立以"生存权"为中心的会计第二报告体系,并尝试构建了相关报表体系,同时建议企业通过建立会计第二报告体系达到系统环境控制目的。     

区域合作语境下的环京津休闲旅游带开发建设

旅游业的快速发展带来了旅游业激烈的竞争,旅游区域合作是实现资源互补、客源共享、避免恶性竞争、实现多方共赢的必然选择。京津冀交通的无缝对接,同城化效应正在显现,资源一体化趋势日益明显,加快建立合作协调机制,以文化梯度差定位旅游产品,实现信息、服务共享及共同营销成为环京津休闲旅游带建设的发展路径。     

联合支护巷修技术在大断面巷道牛鼻子交岔点的应用

由于受22地区采面采动的影响,冯营公司三号交岔点134米至188.5米,以及东绕道25米、东西通道17米,大部分碹体顶破裂、掉渣严重,传统的方法只能是架设U型钢支护,这样做不但消耗大量的人力、物力、而且效果也不佳。在U型钢支架与金属网的基础上通过喷浆注浆来提高围岩的整体性,并且通过对牛鼻子施行加固工艺,来达到减轻巷道破坏程度的目的,保证了支护质量,确定了施工工艺、支护方式和支护参数,取得了良好的支护效果。     

An experimental comparison of collective choice procedures for excludable public goods

This paper compares three collective choice procedures for the provision of excludable public goods under incomplete information. One, serial cost sharing (SCS), is budget balanced, individually rational, anonymous and strategy proof. The other two are “hybrid” procedures: voluntary cost sharing with proportional rebates (PCS) and with no rebates (NR). PCS satisfies all these properties except strategy proofness, and NR satisfies all the properties except for strategy proofness and budget balance. However, PCS and NR do not exclude any potential users, and they do not require equal cost shares, thereby overcoming the two main sources of inefficiency with SCS. We characterize the Bayesian Nash equilibria (BNE) of the hybrid mechanisms and conduct laboratory experiments to compare the performance of the three mechanisms. We find that PCS produces significantly more efficient allocations than either SCS or NR.     

英语中否定词no[not]+比较级

学过英语的人,既晓得no和not的词性,也知道其用法。不过它们除了分别修饰名词和谓语动词之外,它们还有多种用法。中着重讲解否定词no [not] 比较级的用法。     

“中国第一拍”两度流拍——博弈论的经典分析

被誉为“中国第一拍”的广东国际大厦实业有限公司的100％投资权益连续两次举行拍卖,由于没有竞买人应价,在短短一个半月内接连造成两次尴尬流拍。“中国第一拍”何以一再流拍?运用博弈论方法,对其中缘由进行深层次的经济透析可释为是一个典型的经济博弈问题。     

Pricing and hedging European options with discrete-time coherent risk

The aim of the paper is to provide as explicit as possible expressions for upper/lower prices and for superhedging/subhedging strategies based on discrete-time coherent risk measures. This is done on three levels of generality. For a general infinite-dimensional model, we prove the fundamental theorem of asset pricing. For a general multidimensional model, we provide expressions for prices and hedges. For a wide class of models, in particular, including GARCH, we give more concrete formulas, a sufficient condition for the uniqueness of a hedging strategy, and a numerical algorithm.      

Indeterminacy in a dynamic two-country model

The purpose of this paper is to show that indeterminacy can arise in a simple competitive two-country dynamic model of international trade, free of externalities, imperfect competition, and government intervention. This seemingly surprising result is based on an assumption that there is no international credit market. As will be shown later, the assumption implies that dynamic equilibrium paths of our two-country, therefore heterogeneous consumer, model are not generally Pareto-optimal.The paper is dedicated to Professor Mukul Majumdar on the occasion of his 60th birthday with great respect. We thank Takashi Kamihigashi, Tapan Mitra and Makoto Yano for their useful comments on the earlier version of this paper.