全文获取类型
收费全文 | 4553篇 |
免费 | 130篇 |
专业分类
管理学 | 681篇 |
民族学 | 26篇 |
人才学 | 1篇 |
人口学 | 456篇 |
丛书文集 | 39篇 |
教育普及 | 1篇 |
理论方法论 | 542篇 |
综合类 | 51篇 |
社会学 | 2333篇 |
统计学 | 553篇 |
出版年
2021年 | 28篇 |
2020年 | 60篇 |
2019年 | 78篇 |
2018年 | 80篇 |
2017年 | 132篇 |
2016年 | 100篇 |
2015年 | 75篇 |
2014年 | 83篇 |
2013年 | 779篇 |
2012年 | 141篇 |
2011年 | 168篇 |
2010年 | 109篇 |
2009年 | 133篇 |
2008年 | 146篇 |
2007年 | 144篇 |
2006年 | 159篇 |
2005年 | 144篇 |
2004年 | 131篇 |
2003年 | 122篇 |
2002年 | 131篇 |
2001年 | 88篇 |
2000年 | 96篇 |
1999年 | 85篇 |
1998年 | 68篇 |
1997年 | 73篇 |
1996年 | 90篇 |
1995年 | 66篇 |
1994年 | 64篇 |
1993年 | 59篇 |
1992年 | 61篇 |
1991年 | 59篇 |
1990年 | 53篇 |
1989年 | 63篇 |
1988年 | 45篇 |
1987年 | 43篇 |
1986年 | 59篇 |
1985年 | 59篇 |
1984年 | 57篇 |
1983年 | 46篇 |
1982年 | 37篇 |
1981年 | 44篇 |
1980年 | 39篇 |
1979年 | 48篇 |
1978年 | 43篇 |
1977年 | 34篇 |
1976年 | 40篇 |
1975年 | 40篇 |
1974年 | 30篇 |
1972年 | 17篇 |
1971年 | 26篇 |
排序方式: 共有4683条查询结果,搜索用时 226 毫秒
121.
Over the past two decades, community management has become theprevalent model for management of rural water supplies throughoutsub-Saharan Africa. Despite its widespread popularity amongdonors and implementing agencies, low water supply sustainabilitylevels throughout the sub-continent indicate that it is notthe panacea it is often presented to be. There is a strong needto distinguish between community participationwhich is a prerequisite for sustainability and communitymanagement which is not. If community management systemsare to be sustainable, they require ongoing support from anoverseeing institution to provide encouragement and motivation,monitoring, participatory planning, capacity building, and specialisttechnical assistance. If such support is not available, alternativessuch as household water supplies and private sector servicedelivery should be considered. 相似文献
122.
The Experience-Earnings Profile: Productivity-Augmenting or Purely Contractual? Evidence from the UK
William J. Moore Robert J. Newman Geoffrey K. Turnbull 《Journal of Labor Research》2007,28(3):417-435
We test the human capital interpretation of the experience-earnings profile. Does the upward sloping portion of the experience-earnings
profile reflect on-the-job training which in turn causes the experience-productivity profile to slope upwards, or do purely
contractual factors determine the nature of life-cycle earnings. Herein, we provide additional evidence on the relationship
between productivity and earnings by examining earnings differentials in the UK academic labor market for economists. Using
a test first suggested by Mincer, we find that the empirical results are consistent with human capital theory. We find that,
although the positive relationship between earnings and experience persists when individual productivity measures are included
in the salary equations for lecturers and senior lecturers, the positive relationship becomes statistically insignificant
when the same productivity measures are included in the salary equations for professors. For lecturers and senior lecturers,
the experience-salary profile properly reflects the structure of the national pay scale rather than variations in individual
research productivity. At the professor level, where individual salaries are not determined by a pay scale, the data support
the human capital explanation of the positive experience-earnings profile.
相似文献
Robert J. NewmanEmail: |
123.
124.
This note examines the sensitivity of the basic economic-order-quantity inventory model to lot-size errors when holding costs are assumed to be a strictly increasing (though not necessarily linear) function of average inventory. In particular, we show that the penalty associated with ordering either too much or too little is a function not only of the size of the error but of the shape of the holding-cost curve as well. We demonstrate that, under certain conditions, even relatively small lot-size errors can be extremely costly. 相似文献
125.
Livingston data on expected inflation rates have been used extensively in the financial literature, especially in investgating the relationship between nominal interest rates and expected inflation rates; however, the data have not been subjected to a thorough analysis of forecast accuracy. The objective of this paper is to analyze the forecast properties of Livingston data using a wide variety of time and frequency domain methods over an extended sample period and for selected subperiods. 相似文献
126.
In this paper we incorporate a linear demand function to model the price-volume causal relationship into stochastic cost-volume-profit (CVP) analysis. We assume that the objective function is to maximize expected profit; other objective functions are also discussed and compared. A linear stochastic model follows from which probabilistic statements can be easily obtained if the random variables are assumed to be multivariate normal. The basic framework is shown to be a special case of project value maximization where project value is the cash flow of the project discounted for time and risk according to the capital asset pricing model. Moreover, an intertemporal extension that considers inventory is developed. In summary, a new approach to stochastic CVP analysis that incorporates the management decision process in an uncertain environment is developed. 相似文献
127.
Using the first (1995) and third (2001-2002) waves of the Add Health survey, we examine women 's family transitions up to age 24. Only a third of all women marry, and a fifth of those marriages dissolve before age 24. Three out of eight women have afirst birth, with a substantial majority of those births outside of marriage: 66% for whites, 96% for blacks, and 72% for Mexican Americans. Cohabitation is the predominant union form; 59% of women cohabit at least once by age 24. Most cohabitations are short lived, with approximately one in five resulting in a marriage. We summarize the family and relationship experience of women up to age 24 in terms offour categories, each accounting for roughly a quarter of all women. Category 1 has the women who remain single nonparents. Category 2 has the early marriers, women whose marriage is not preceded by a first birth. Category 3 has those who become single parents. Category 4 has the women who cohabit at least once, but who do not marry or have a birth by age 24. The strictly ordered transitions of the 1950s are long gone and have been replaced by a variety of paths to adulthood. 相似文献
128.
How do marital status,work effort,and wage rates interact? 总被引:1,自引:0,他引:1
How marital status interacts with men's earnings is an important analytic and policy issue, especially in the context of debates in the United States over programs that encourage healthy marriage. This paper generates new findings about the earnings-marriage relationship by estimating the linkages among flows into and out of marriage, work effort, and wage rates. The estimates are based on National Longitudinal Survey of Youth panel data, covering 23 years of marital and labor market outcomes, and control for unobserved heterogeneity. We estimate marriage effects on hours worked (our proxy for work effort) and on wage rates for all men and for black and low-skilled men separately. The estimates reveal that entering marriage raises hours worked quickly and substantially but that marriage's effect on wage rates takes place more slowly while men continue in marriage. Together; the stimulus to hours worked and wage rates generates an 18%-19% increase in earnings, with about one-third to one-half of the marriage earnings premium attributable to higher work effort. At the same time, higher wage rates and hours worked encourage men to marry and to stay married. Thus, being married and having high earnings reinforce each other over time. 相似文献
129.
Motivated by problems in linguistics we consider a multinomial random vector for which the number of cells N is not much smaller than the sum of the cell frequencies, i.e. the sample size n . The distribution function of the uniform distribution on the set of all cell probabilities multiplied by N is called the structural distribution function of the cell probabilities. Conditions are given that guarantee that the structural distribution function can be estimated consistently as n increases indefinitely although n / N does not. The natural estimator is inconsistent and we prove consistency of essentially two alternative estimators. 相似文献
130.