拐点和一元三次方程的求根公式

用一元函数微分学理论，对一元三次实系数方程x^3 bx^2 cx d=0的求根问题作了新的探讨。     

试论党的基层组织建设与人的全面发展

“促进人的全面发展”是党的基层组织建设工作的内在要求 ,党的基层组织建设是推进“人的全面发展”的坚实基础 ,二者是互动的关系。在新形势下 ,党的基层组织建设要为“人的全面发展”开辟新途径。     

氮肥施用对冬小麦土壤残留NO3^——N含量及根系分布影响

通过6个氮水平试验，研究了不同氮肥用量对冬小麦土壤剖面NO3^--N含量及其与根系空间分布对应关系的影响；探索了土壤剖面NO3^--N含量与氮肥施用量的趋势规律，以及冬小麦施用氮肥对地下水造成污染的成因、规律及最危险时期。     

中国股票市场价格波动特征分析

在股票市场中最令人捉摸不定,也最具有吸引力的是波动不已的股票价格。文章对中国股票市场价格波动的分析是从1997年9月展开至2002年10月,其间恰逢中国股市经历了一段从牛市的繁荣到熊市的萧条的过程,两种泾渭分明的市场氛围恰好提供了一个深入研究股票市场价格波动特征的有利契机。遵循经济控制论研究的思路,文章采用了理论分析、市场交易数据的实证研究等技术手段对中国股票市场价格波动进行了研究,通过运用经济控制论的方法建立理论模型,以上海股市和深圳股市的综合指数为样本,对中国股票市场系统本身的波动特征和稳定性进行了量化分析。     

穿越当代"经典"--文化寻根文学热点作品局限评述

所谓文学穿越,它一方面穿越的是政治和文化,并通过政治和文化走向人类关怀,另一方面穿越的是既定的各种世界观,建立起作家自己的世界观。本文所做的,就是依据一个作家应该建立起的对世界的独到的哲学性理解,来看中国新时期文学“文化寻根文学”阶段几部轰动性作品所存在的思想性和文学性局限。     

Robust block bootstrap panel predictability tests*

This article develops two block bootstrap-based panel predictability test procedures that are valid under very general conditions. Some of the allowable features include cross-sectional dependence, heterogeneous predictive slopes, persistent predictors, and complex error dynamics, including cross-unit endogeneity. While the first test procedure tests if there is any predictability at all, the second procedure determines the units for which predictability holds in case of a rejection by the first. A weak unit root framework is adopted to allow persistent predictors, and a novel theory is developed to establish asymptotic validity of the proposed bootstrap. Simulations are used to evaluate the performance of our tests in small samples, and their implementation is illustrated through an empirical application to stock returns.     

全媒体时代基层民主协商的传播创新与经验启示——以浙江省温岭市为例

新媒体技术的发展给国家治理现代化带来新机遇的同时，也带来了新挑战。全媒体时代，温岭民主恳谈制度在地方政治家的推动下实现了传播创新，找到了全社会意愿和要求的最大公约数，更加广泛了解民意集聚民智，更加深入化解矛盾，最大限度凝聚共识，深化了民主恳谈这一颇具地方特色的协商民主模式。温岭的创新实践表明，互联网治理同国家治理现代化具有直接的同构性，新媒体提供了新资源和新契机，传播创新使民主恳谈的协商功能进一步深化，社会整合效果明显。在全媒体时代，正向传播效应需要协同推进，执政党要架构新机制，协同推进基层民主协商的正向传播，助推社会有效整合。     

Size distortion of asymmetric unit root tests in the presence of level shifts

The finite-sample size properties of momentum-threshold autoregressive (MTAR) asymmetric unit root tests are examined in the presence of level shifts under the null hypothesis. The original MTAR test using a fixed threshold is found to exhibit severe size distortion when a break in level occurs early in the sample period, leading to an increased probability of an incorrect inference of asymmetric stationarity. For later breaks the test is also shown to suffer from undersizing. In contrast, the use of consistent-threshold estimation results in a test which is relatively robust to level shifts.     

按照“三个代表”要求加强高校党的建设

根据江泽民同志"三个代表"重要思想的要求,结合国际国内政治经济形势发展的实际以及高等学校的特点,从思想政治、党员科技文化素质和基层组织建设等方面对高等学校加强党的建设进行了深入分析与阐述,并提出了具有一定探索意义的建议.     

THE BEHAVIOR OF HEGY TESTS FOR QUARTERLY TIME SERIES WITH SEASONAL MEAN SHIFTS

ABSTRACT

This paper studies the behavior of the HEGY statistics for quarterly data, for seasonal autoregressive unit roots, when the analyzed time series is deterministic seasonal stationary but exhibits a change in the seasonal pattern. We analyze also the HEGY test for the nonseasonal unit root. the data generation process being trend stationary too. Our results show that when the break magnitudes are finite, the HEGY test statistics are not asymptotically biased toward the nonrejection of the seasonal and nonseasonal unit root hypotheses. However, the finite sample power properties may be substantially affected, the behavior of the tests depending on the type of the break.