论我国学报百年发展的基本经验——为纪念我国高等学校学报创办100周年而作

我国高等学校创办学报一百年来积累了丰富的经验:学报要立足本校放眼社会,反映主办学校的学术成果、促进校内外的学术交流、推动学校的教学和科研的发展,在此基础上承担起传播知识、研究学问、启迪思想、繁荣学术、传承文明的历史使命;学报要坚持学术性,努力提高学术品位;学报要有体现创新精神的办刊理念;学报编辑要做学者型的编辑。     

中国传统家庭中的日常交往关系论析

传统家庭中的日常交往关系不仅具有等级性、狭隘性、人情化及复杂性等基本特征,还具有与之相应的复杂关系。并且,中国传统日常交往活动亦有其大致的活动阈限和交往原则,即富于传统特色的血缘家庭和家庭伦理规范。     

The minimum of the expected value of the product of three random variables in the Fréchet class

Summary In this paper the minimum of the expected value of the product of three random variables is studied as their joint distribution function varies in the Fréchet class associated to the three given marginal distribution functions. The general problem is studied for three positive valued random variables and a lower bound for the minimum is provided. The case of three uniformly distributed random variables in [0, 1] is analyzed in more detail and an upper bound for the minimum is given. The Author conjectures that the distribution correspondent to the upper bound is a solution of the problem. Paper written with the contribution of MURST (funds 40%).     

Lower Bounds on Approximation Errors to Numerical Solutions of Dynamic Economic Models

We propose a novel methodology for evaluating the accuracy of numerical solutions to dynamic economic models. It consists in constructing a lower bound on the size of approximation errors. A small lower bound on errors is a necessary condition for accuracy: If a lower error bound is unacceptably large, then the actual approximation errors are even larger, and hence, the approximation is inaccurate. Our lower‐bound error analysis is complementary to the conventional upper‐error (worst‐case) bound analysis, which provides a sufficient condition for accuracy. As an illustration of our methodology, we assess approximation in the first‐ and second‐order perturbation solutions for two stylized models: a neoclassical growth model and a new Keynesian model. The errors are small for the former model but unacceptably large for the latter model under some empirically relevant parameterizations.     

科技竞赛在本科创新教育中的探索与实践

文章针对科技竞赛在本科创新教育中的作用及意义,对本科科技竞赛活动的必要进行了分析,然后给出了在"中法SC ILAB科学计算自由软件程序设计竞赛"活动中对本科创新教育的探索和实践过程,最后对实践过程中的经验及启示进行了总结。     

论自治条例的性质

自治条例是民族自治地方全面调整自治事务的总章程。民族区域自治法公布实施以来,围绕自治条例性质的评论和争议一直没有中断,这也是制约和影响五大自治区自治条例出台的重要因素之一。本文从两个方面论述了自治条例的性质,认为自治条例具有法规性和法律性,是法规性与法律性的有机统一。     

A lower bound for the transition density function of a stochastic differential equation

Let W_t be a one-dimensional Brownian motion on the probability space (Ω,F,P), and let dx_t = a(x_t)dt + b(x_t)dw_t, b²(x) > 0, be a one-dimensional Ito stochastic differential equation. For a(x) = a₀ + a₁x + … + a_nxⁿ on a bounded interval we obtain a lower bound for p(t,x,y), the transition density function of the homogeneous Markov process x_t, depending directly on the coefficients a₀,a₁, …, a_n, and b(x).     

Some Bayesian lower bounds on reliability in the lognormal distribution

The two-parameter lognormal distribution with density function f(y: γ, σ²) = [(2πσ²)^1/2y] ¹exp[?(ln y ? γ)²/2σ²], y > 0, is important as a failure-time model in life testing. In this paper, Bayesian lower bounds for the reliability function R(t: γ, σ²) = ?[(γ ? ln t)/σ] are obtained for two cases. First, it is assumed that γ is known and σ² has either an inverted gamma or “general uniform” prior distribution. Then, for the case that both γ and σ² are unknown, the normal-gamma prior and Jeffreys' vague prior are considered. Some Monte Carlo simulations are given to indicate some of the properties of the Bayesian lower bounds.     

从走马楼吴简看两汉与孙吴的"调"

两汉时期与财政经济政策有关的"调",主要有以下4种用法第一,表示调发、调度;第二,官府出钱采购所需物品,有时也称为"调";第三,作为赋税的泛称,"租调"、"赋调"频繁出现于史籍;第四,表示苛捐杂税.鉴于孙吴赋税的繁重程度及其对东汉赋税制度的保留,鉴于史书中并没有关于孙吴进行类似曹魏那样的赋税改革的明确记载,根据现有简牍资料可以认定,吴调也同样是汉调的延续,而与曹魏的户调不同.吴简中即使有按户或户品征收的调,也仍然属于苛捐杂税.     

时间与空间的交织和变化——《水浒传》中的地理位置与黄河下游的河道变迁

就《水浒传》而言,至少存在3个时间概念:事件发生的北宋;作品产生的元末明初;读者所处的时代。空间与时间交织在一起,不能截然分开。如果不能充分了解空间随着时间而产生的变化,就可能引起混乱。黄河在宋元之间泛滥频繁,下游河道变化巨大,淤埋城镇村庄,改变平原水系道路。《水浒传》中不具体叙述地理位置,显示了作者的明智;而少数看似不合理的行走线路可能是真实存在的,如元末明初从江州至开封完全可以在梁山作水陆换行,这与当时黄河、运河的状况相符。因此,传统文化和人文学科的研究必须具备求真务实的科学精神。