关于完善我国进出口检验检疫制度的思考

结合社会实践,分析我国检验检疫面临的新问题与新挑战,提出要加快检验检疫制度标准化的进程,促进有关检验检疫法律法规的完善,加强政策制度的建设,填补法律空白,弥补法律漏洞,提高政策执行的可行性与科学性;加大检验检疫部门的行政监管力度,做到科学监管、依法监管、人性监管;完善我国检验检疫机构的行政配置,提高检验检疫机构的职能设置与国际标准的融合度,进而推进我国检验检疫事业的可持续发展,维护国家在进出口贸易中的经济利益,捍卫国家主权与形象尊严。     

新“国五条”的两种可能结果：一个基于理性预期的分析——以天津市为例

2013年2月20日,国务院常务会议决定加强房地产市场调控力度,出台了新“国五条”。新“国五条“继承了中央紧缩的房地产市场调控思路,进一步打压房价,限制二手房交易并鼓励保障性住房建设,尤其是其规定的对个人二手房销售者按照销售收入征收20％的个税更是引起国内一片争论,许多二手房持有者急于在新政策实行前出手自己的房屋。事实上,新“国五条”是一把双刃剑,在取得房价可以预期的立竿见影的下跌的同时,为未来的房地产市场甚至中国经济埋下了隐患,这些隐患究竟是什么,如何做可以避免这些隐患,从这些问题出发,提出了一些建议,有一定的参考价值。     

Applying free random variables to random matrix analysis of financial data. Part I: The Gaussian case

We apply the concept of free random variables to doubly correlated (Gaussian) Wishart random matrix models, appearing, for example, in a multivariate analysis of financial time series, and displaying both inter-asset cross-covariances and temporal auto-covariances. We give a comprehensive introduction to the rich financial reality behind such models. We explain in an elementary way the main techniques of free random variables calculus, with a view to promoting them in the quantitative finance community. We apply our findings to tackle several financially relevant problems, such as a universe of assets displaying exponentially decaying temporal covariances, or the exponentially weighted moving average, both with an arbitrary structure of cross-covariances.     

Derivatives pricing with marked point processes using tick-by-tick data

I propose to model stock price tick-by-tick data via a non-explosive marked point process. The arrival of trades is driven by a counting process in which the waiting time between trades possesses a Mittag–Leffler survival function and price revisions have an infinitely divisible distribution. I show that the partial-integro-differential equation satisfied by the value of European-style derivatives contains a non-local operator in time-to-maturity known as the Caputo fractional derivative. Numerical examples are provided for a marked point process with conditionally Gaussian and with conditionally CGMY price innovations. Furthermore, the infinitesimal generator of the marked point process derived to price derivatives coincides with that of a Lévy process of either finite or infinite activity.     

Compulsory schooling laws and school crime

Extensive literature demonstrates that compulsory schooling laws improve educational attainment, well-being, civic involvement, and labour market outcomes. However, at-risk youth incapacitated to schools may impact the learning environment and school safety. The purpose of this article is to study whether raising the minimum dropout age (MDA) requirement above 16 increases crime committed within US public high schools. A difference-in-difference estimation exploits changes in state-level MDA laws over time and indicates that schools in states that raise their MDA requirement to 18 incur more overall crime relative to schools in states that do not, while no effect on overall crime is identified when the MDA requirement is raised to 17. Furthermore, these effects persist for 4 years after passage and more intensely in metropolitan areas. Coupling this research with existing literature suggests that when the MDA requirement is raised to 18, only a small portion of the observed reduction in juvenile crime is displaced to schools. Analysis by category of crime reveals schools incur more physical attacks, no change in illegal drug and property crimes, and fewer violent crimes in states that raise their MDA requirement to 18, while illegal drug crimes increase in states that raise their MDA requirement to 17.     

论基于总量控制的排污权交易市场建设

与浓度控制相比,总量控制具有优越性,其将是我国环境管理政策的必然选择。在市场经济条件下,总量控制的实施,必然会产生排污权交易;而总量控制也是排污权交易的基础。因此,我国在由浓度控制向总量控制的转变过程中,要重视排污权交易市场的建设,加快立法步伐,制定科学的排污权交易规则,以适应环境新变化,逐步建立起完善的排污权交易市场。     

帕斯卡尔论正义

帕斯卡尔对正义问题做了思考。他先是批判了人们通常持有的正义观念,指出现世人观念中的“正义”其实都是虚假的,不可能存在真正的正义。继尔,通过分析他又认为有必要对民众保持欺骗,维护他们对法律、习俗和强权服从的习惯。最后,他谋求正义与强力的结合,希望人类能够向真正的正义更多的靠近。     

物理实验用无胶斑激光靶研制

文章简述了无胶斑激光靶的制备工艺。原先的平面靶是将靶杆直接放到金圆盘靶平面上用胶粘接,现在是金圆盘本身长出连接金丝,使金丝与靶杆用胶粘接,从而避免了金圆盘表层有胶。在电火花加工过程中,工具和工件之间的脉冲火花放电产生局部,瞬间的高温把金属材料逐步蚀除掉,因此工具与工件之间无相互作用力。在微细加工方面有独特的优势。重要的是一次加工成型,既保证了加工精度,又提高了加工效率,省时省力。无胶斑激光靶的研制成功,消除了激光靶表面上的胶斑,同时也提高了激光靶的装配质量,使激光靶的制造精度得以提高,为物理实验提供了条件。     

基于KIFA的物流外包服务商选择机制研究

本文主要研究昆明国际花卉拍卖交易中心(KIFA)物流外包服务商的选择机制,从KIFA拍卖交易完成后到最终的鲜花零售店的各个物流环节。本文提出了基于招投标的配送服务商的初选方法,再用AHP方法[1]最终确定最佳配送服务商。从而提高了昆明国际花卉拍卖交易中心的花卉物流服务、降低了成本、提高了客户满意度,同时,为同类花卉拍卖交易中心物流服务商的选择提供参考依据。     

PE法律问题新研究——以PE不同组织形式税收优劣分析为视角

随着中国经济持续快速增长和国内资本市场的逐步完善,私募股权投资(即通常所言PE)在国内市场得到了迅猛发展。在此背景下,国家出台了一系列法律法规和政策文件支持PE投资的成长壮大。本文在对PE投资基本法律知识及国内外学者的研究状况简要梳理的前提下,剖析了国内对PE投资不同组织形式的学说见解,重点对PE投资不同组织形式的税收优劣问题提出自己新的研究观点,纠正学理界一直以来的错误论断,旨在对保证PE投资在国内的发展和完善有所帮助。