城市自然遗留地的多元价值

一、引言 在快速、迅猛的城市化发展过程中,城市中遗留下来一些自然或近自然的区域,我们称其为"城市自然遗留地".城市自然遗留地能够凋节城市区域气候、净化空气、涵养水源、促进营养物质的循环和贮存,能够为人类提供一定的动植物资源,并且具有开发生态游憩的潜力,能够为城市居民提供体验城市生态和享受自然环境的机会.     

关于堤防工程地质勘察中问题的分析

随着我国勘探事业的发展,在堤防工程地质勘察工作中始终存在一些共性的问题,必须引起工作者的关注和深入探讨。关于堤防工程地质分段分类的问题就是各勘测单位照顾不周全的焦点之一,本文就这一现象提出自己的分类法,希望对堤防工程勘测设计工作的进一步深化贡献力量。     

基于区域可达性定量模型的新疆出口加工贸易基地选择研究

在加工贸易区或加工贸易基地选择研究方面，学界主要集中在基于因子分析方法的投资环境视角的研究上。文章采用另一种方法——区域可达性定量模型，对新疆主要中心城市和口岸城市的区域可达性进行计算，并按区域可达性大小排序。在国家实施东部地区产业转移的政策环境下，文章结合新疆特色加工产业群，对新疆加工贸易的发展和区域空间结构布局调整做了初步思考。     

Bailouts,Monitoring, and Penalties: An Integrated Framework of Government Policies to Manage the Too‐Big‐to‐Fail Problem

This paper discusses optimal government bailout policy where the costs of systemic failures and moral hazard problems are considered. We find that a three‐tiered bailout policy that includes an ex post monitoring and bailout scheme for financial institutions with large systemic impacts (‘too big to fail’) is optimal. The optimal policy also requires a randomized bailout for medium‐impact institutions (‘Constructive Ambiguity’), and no bailout for institutions that have only minimal systemic consequences (‘too small to save’). However, in a volatile, innovative market environment where individual institutions may know more than the government regulator, monitoring error could contribute to risk taking, leaving the government regulator to always play a ‘catch‐up’ role in revising policy. Moreover, the optimal bailout policy may not be time‐consistent: institutions not deemed ‘too big to fail’ may still have an incentive to take excessive risks and expect to be bailed out in case of insolvency, primarily due to the short‐term orientation of the government. Finally, because an institution's systemic cost affects the probability of a bailout, we show that the boundary of an institution may be extended by the government subsidy.     

信息共享媒介与主体间协作的相互影响研究

经济学大量研究了主体间信息不对称与信息共享对主体间协作效率的影响而缺乏对信息共享可行性自身的研究，本文针对主体间信息共享所依赖媒介（本文称之为编码系统）的具体特征，以及怎样的环境可以促进主体间形成更有效的信息共享手段问题进行了探讨。研究表明，有限理性主体赖以实现信息共享与协作的编码系统将影响主体间信息传递，不同的信息共享媒介会导致不同的信息传递效率与协作效率；当持有不同信息共享媒介的主体间进行协作时，主体所处分工协作的具体场景特征将影响主体间能否达成的有效的信息共享媒介并最终影响主体间协作效率。     

基于单片机的数据复用器研究

本文探讨的是一个两路的数据复用器，该数据复用器采用异步串行通信方式，主要用89C51单片机来实现，我们从硬件和软件两方面完成了数据复用器的设计与开发及调试，通过实际的安装，基本达到了该复用器的设计性能指标，它具有结构简单、体积小、传输数据可靠等特点。     

Can Production Subsidies Explain China's Export Performance? Evidence from Firm‐level Data*

This paper analyses the relationship between production subsidies and firms’ export performance using a very comprehensive and recent firm‐level database and controlling for the endogeneity of subsidies. It documents robust evidence that production subsidies stimulate export activity at the intensive margin, although this effect is conditional on firm characteristics. In particular, the positive relationship between subsidies and the intensive margin of exports is strongest among profit‐making firms, firms in capital‐intensive industries, and those located in non‐coastal regions. Compared to firm characteristics, the extent of heterogeneity across ownership structure (SOEs, collectives, and privately owned firms) proves to be relatively less important.     

Safe Harbours in Merger Guidelines: What Should They Be?

Safe harbours in merger guidelines define post‐merger market concentration or concentration change thresholds below which proposed mergers are unlikely to be anti‐competitive; anti‐competitiveness is usually measured as a ‘substantial lessening of competition’. Yet competition agencies have different safe harbours. We used merger models to run many simulations involving a wide range of market structures and merger‐induced aggregations. The post‐merger unilateral price increases in these scenarios were used to gauge what the safe harbours should be to keep price increases below a specified threshold. The safe harbour thresholds commonly used were found typically to be too restrictive, in that they failed to screen out mergers that were almost certainly competitively benign.     

未婚青年生殖健康咨询服务利用与评价

利用2009年全国青年生殖健康可及性抽样调查数据,通过描述性统计对15-24岁青年生殖健康咨询服务利用状况与效果进行研究.2009年青年咨询需要率(人次比人数)为39.1%,同时超过80%的青年未报告有任何咨询需要;此外农村15-19岁男性咨询需要率与实现率(人次比人次)都高于同龄女性,但有咨询需要的比例低于女性,可见未婚青年尤其是农村15-19岁男性的生殖健康状况严峻.需要为未婚青年尤其是农村15-19岁男性青年提供一揽子咨询服务.不同咨询途径存在的问题不同,需要有针对性地提高青年生殖健康咨询服务的可及性.