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41.
Bauman (1980) showed that the perceived costs and benefits of drug abuse predicted adolescents' subsequent marijuana abuse. The purpose of this study was to replicate the Bauman study with Chinese adolescents in Hong Kong, adding further analysis of individual items of perceived costs and benefits of their drug usage. A total of 77 youth at risk (aged 12–21) were interviewed with a structured questionnaire and their attitudes toward drug abuse, stress level, coping strategies, and parents' marital status were obtained. Congruent with the utility theory, results indicated that the more positive their attitude toward drug abuse, the more likely their involvement in drugs and the higher the observed stages of abuse. However, there was no significant difference between the drug abusers and non-users in some antecedent variables including stress levels in most areas of the adolescent lives, in most stress coping strategies, and parents' marital status. Results are discussed in relation to prevention of adolescent drug abuse. 相似文献
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It is quite common to observe heteroskedasticity in real data, in particular, cross-sectional or micro data. Previous studies concentrate on improving the finite-sample properties of tests under heteroskedasticity of unknown forms in linear models. The advantage of a heteroskedasticity consistent covariance matrix estimator (HCCME)-type small-sample improvement for linear models does not carry over to the nonlinear model specifications since there is no obvious counterpart for the diagonal element of the projection matrix in linear models, which is crucial for implementing the finite-sample refinement. Within the framework of nonlinear models, we develop a straightforward approach by extending the applicability of HCCME-type corrections to the two-step GMM method. The Monte Carlo experiments show that the proposed method not only refines the testing procedure in terms of the error of rejection probability, but also improves the coefficient estimation based on the mean squared error (MSE) and the mean absolute error (MAE). The estimation of a constant elasticity of substitution (CES)-type production function is also provided to illustrate how to implement the proposed method empirically. 相似文献
44.
Kok Ben Toh Chin Soon Lionel Ng Bokai Wu Tai Chong Toh Pei Rong Cheo Karenne Tun Loke Ming Chou 《Urban Ecosystems》2017,20(1):183-197
Berthing pontoons, one of the most ubiquitous structures in marinas, are known to provide recruitment substrate for a variety of marine biota but little has been reported on their capacity to support epibiotic organisms in tropical marinas, and even less is known about the factors that shape their distribution in such environments. We surveyed the epibiotic assemblages on the sides of pontoons in three Singapore marinas and examined the environmental conditions that influenced their distribution. A total of 94 taxa were recorded, with each marina hosting 43–65 taxa. Assemblages among marinas were highly distinct, and, key discriminants included components of biotic (alcyonarians, hexacorallians, bivalves, and annelids), as well as abiotic (sediment, bare area and shell fragments) origin. While the assemblage variation among marinas was influenced by local environmental conditions (e.g. water motion and sedimentation rate) and pontoon material, the variation in distribution within each marina was best explained by the distance of the pontoons from the marina’s entrance (epibiotic diversity and taxa richness were lower away from the marina entrance). Knowledge on the distribution of epibiotic assemblages on pontoons is essential to identify the factors that contribute to spatial variation and encourage the design and construction of ecologically-friendly marinas. Our findings suggest that improvements to pontoon design and layout would help to augment marina biodiversity, enhance the ecology of urbanised coasts, and mitigate development impacts. 相似文献
45.
Abstract In a recent study of family size ideals in the D.S.A. it was found that in the 1960'S the mean ideal family size of Catholics was about half a child higher than the mean ideal size of non-Catholics. This note describes an analysis of similar data for married women in Great Britain, derived from an investigation undertaken in 1966 for the Population Investigation Committee. A difference in ideal family size, which was of the same order as the American difference, was found; and, in addition, the actual fertility of Catholics was compared with that of others. 相似文献
46.
The network autocorrelation model has been a workhorse for modeling network influences on individual behavior. The standard network approaches to mapping social influence using network measures, however, are limited to specifying an influence weight matrix (W) based on a single mode network. Additionally, it has been demonstrated that the estimate of the autocorrelation parameter ρ of the network effect tends to be negatively biased as the density in W matrix increases. The current study introduces a two-mode version of the network autocorrelation model. We then conduct simulations to examine conditions under which bias might exist. We show that the estimate for the affiliation autocorrelation parameter (ρ) tends to be negatively biased as density increases, as in the one-mode case. Inclusion of the diagonal of W, the count of the number of events participated in, as one of the variables in the regression model helps to attenuate such bias, however. We discuss the implications of these results. 相似文献
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This study aims to enhance our understanding of job satisfaction of direct care workers in assisted living facilities. Low job satisfaction is related to high turnover rates and lower quality of care in assisted living. We integrate two theories of job satisfaction to investigate relationships among workplace support, role overload, and job satisfaction. Data are from a survey of 984 direct care workers in 108 assisted living facilities. Results from multilevel hierarchical linear models (HLM) indicate that job satisfaction varies both within and among facilities. Job satisfaction is negatively associated with role overload, and it is positively associated with institutional support, supervisor instrumental and emotional support, and coworker emotional support. These workplace support measures and role overload are separately and independently associated with job satisfaction. Enhancing job satisfaction of assisted living direct care workers will likely require a multipronged approach that includes improving institutional, supervisor, and coworker support while simultaneously directly addressing role overload. 相似文献
49.
Rachel M. Mirecki Jessica L. Chou Michael Elliott Christine M. Schneider 《Journal of divorce & remarriage》2013,54(1):78-93
This study examined differences in marital satisfaction between first and second marriages and how additional factors can help explain satisfaction differences between the marriage types. Participants in first marriages reported higher levels of satisfaction than remarried individuals. Regression analyses demonstrated marriage type to be a moderator of satisfaction in second marriages; as education increased, satisfaction also increased. Length of marriage was found to significantly influence satisfaction in first marriages, but not second marriages. In both first and second marriages, participants currently in counseling reported lower satisfaction scores. The need to understand remarriages' distinct characteristics apart from first marriages is discussed. 相似文献
50.
Chien-Tai Lin Cheng-Chieh Chou N. Balakrishnan 《Journal of Statistical Computation and Simulation》2013,83(10):1852-1867
In this paper, we consider a k-level step-stress accelerated life-testing (ALT) experiment with unequal duration steps τ=(τ1, …, τ k ). Censoring is allowed only at the change-stress point in the final stage. A general log-location-scale lifetime distribution with mean life which is a linear function of stress, along with a cumulative exposure model, is considered as the working model. Under this model, the determination of the optimal choice of τ for both Weibull and lognormal distributions are addressed using the variance–optimality criterion. Numerical results show that for a general log-location-scale distributions, the optimal k-step-stress ALT model with unequal duration steps reduces just to a 2-level step-stress ALT model. 相似文献