全文获取类型
收费全文 | 398篇 |
免费 | 4篇 |
国内免费 | 1篇 |
专业分类
管理学 | 25篇 |
人口学 | 1篇 |
丛书文集 | 19篇 |
理论方法论 | 12篇 |
综合类 | 243篇 |
社会学 | 3篇 |
统计学 | 100篇 |
出版年
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 9篇 |
2018年 | 5篇 |
2017年 | 8篇 |
2016年 | 6篇 |
2015年 | 5篇 |
2014年 | 8篇 |
2013年 | 38篇 |
2012年 | 17篇 |
2011年 | 17篇 |
2010年 | 11篇 |
2009年 | 11篇 |
2008年 | 18篇 |
2007年 | 21篇 |
2006年 | 15篇 |
2005年 | 14篇 |
2004年 | 19篇 |
2003年 | 19篇 |
2002年 | 14篇 |
2001年 | 26篇 |
2000年 | 20篇 |
1999年 | 14篇 |
1998年 | 11篇 |
1997年 | 11篇 |
1996年 | 12篇 |
1995年 | 3篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1991年 | 8篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有403条查询结果,搜索用时 15 毫秒
1.
本文给出了一个上复习课的新方法,利用变上限定积分函数的性质,系统地复习一元函数的有关知识,可使很多问题得到很容易地解决和统一。 相似文献
2.
本文阐述了独立观与一体观在编制中期财务报告中的有关理论基础,并在此基础上讨论了独立观与一体观在中期确认和计量中的比较及其在编制利润表中的差异。 相似文献
3.
4.
Recently, we developed a GIS-Integrated Integral Risk Index (IRI) to assess human health risks in areas with presence of environmental pollutants. Contaminants were previously ranked by applying a self-organizing map (SOM) to their characteristics of persistence, bioaccumulation, and toxicity in order to obtain the Hazard Index (HI). In the present study, the original IRI was substantially improved by allowing the entrance of probabilistic data. A neuroprobabilistic HI was developed by combining SOM and Monte Carlo analysis. In general terms, the deterministic and probabilistic HIs followed a similar pattern: polychlorinated biphenyls (PCBs) and light polycyclic aromatic hydrocarbons (PAHs) were the pollutants showing the highest and lowest values of HI, respectively. However, the bioaccumulation value of heavy metals notably increased after considering a probability density function to explain the bioaccumulation factor. To check its applicability, a case study was investigated. The probabilistic integral risk was calculated in the chemical/petrochemical industrial area of Tarragona (Catalonia, Spain), where an environmental program has been carried out since 2002. The risk change between 2002 and 2005 was evaluated on the basis of probabilistic data of the levels of various pollutants in soils. The results indicated that the risk of the chemicals under study did not follow a homogeneous tendency. However, the current levels of pollution do not mean a relevant source of health risks for the local population. Moreover, the neuroprobabilistic HI seems to be an adequate tool to be taken into account in risk assessment processes. 相似文献
5.
本文构建了基于条件概率积分变换的Copula函数选择方法,通过对条件概率积分变换下Anderson-Darling(AD)、Kolmogorov-Smirnov(KS)、Cramér-von Mises(CM)这三种统计量的比较,讨论在不同样本容量和变量维数下其对多种Copula函数的拟合效果。利用GSPTSE、INMEX.MX和NDX三大股指样本,将基于条件概率积分变换的Copula函数选择方法与核密度估计和极大似然估计选择法的效果进行系统比较。结果表明,基于条件概率积分变换的检验法可以有效解决多元Copula函数的选择问题,其拟合优度检验更精确、更稳定;核密度估计检验在大样本下比较稳定,而小样本下稳定性较差;相比之下,极大似然值检验法则不稳定。 相似文献
6.
“妙悟”是在中外文化因子共同作用下产生的富有世界意义的民族诗学话语。妙悟思维是不凭借理性思考而对表现对象的直觉把握和瞬间顿悟;妙悟追求言有尽而意无穷的艺术效果,具有只可意会不可言传性;妙悟实现了由“观物”到“照物”的转变,是天人合一、物我冥合的整体思维活动。 相似文献
7.
8.
Yutaka Nakamura 《Journal of Risk and Uncertainty》1993,6(1):33-48
This article is concerned with thresholds of discrimination of preference judgments under uncertainty. We establish an axiomatic characterization for a threshold representation, where thresholds are represented by inexact measurement of subjective probabilities, i.e., upper and lower probabilities. Since upper and lower probabilities need not be additive, the representational form adopts the Choquet integration. 相似文献
9.
影响川南浅丘区田坎玉米产量的气候条件分析 总被引:1,自引:0,他引:1
利用积分回归方法分析气候因子对川南浅丘区田坎玉米产量的影响。结果表明 ,日照、温度及降雨日数是影响田坎玉米产量的主要因子。苗期的高温 ,生育中期光照不足及灌浆成熟期的雨日偏多均不利于提高田坎玉米产量 相似文献
10.
Jung SH 《Lifetime data analysis》1999,5(1):67-79
In a clinical trial with the time to an event as the outcome of interest, we may randomize a number of matched subjects, such as litters, to different treatments. The number of treatments equals the number of subjects per litter, two in the case of twins. In this case, the survival times of matched subjects could be dependent. Although the standard rank tests, such as the logrank and Wilcoxon tests, for independent samples may be used to test the equality of marginal survival distributions, their standard error should be modified to accommodate the possible dependence of survival times between matched subjects. In this paper we propose a method of calculating the standard error of the rank tests for paired two-sample survival data. The method is naturally extended to that for K-sample tests under dependence. 相似文献