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131.
Jeff Dunn Suzanne K. Chambers 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2016,27(1):425-464
Although episodic volunteers are a critical resource for many organisations, their motives for volunteering are poorly understood. A systematic review was conducted to describe empirical evidence about motives for episodic volunteering (EV) across sectors (sport, tourism, events, health and social welfare). Identified EV motives were then categorised using core functions from the Volunteer Functions Inventory (VFI) for comparison across studies. Twelve databases (1990–December 2014) were searched. Thirty-three English language studies included results describing EV motives. Studies were predominantly cross-sectional, quantitative, event-based and originating in North America. Measurement of motives was also inconsistent. Common motives were helping others and socialising. Physical challenge and healing motives were specific to sport-based events and charity sport events, respectively. Over 80 % of motives were classified using VFI functions, particularly enhancement, values and social functions. The VFI supplemented by qualitative work may be efficacious to further identify EV motives and retention strategies. 相似文献
132.
We propose a social comparison-based framework in which leaders' meta-perceptions of power relative to their followers can be a source of envy, which can then lead to varied behaviors. We provide a model summarizing the main points of this framework, and develop propositions discussing how and when these effects operate. We start by discussing why perceived power differentials between leader and follower are expected to cause envy in the leader-follower relationship, and the contingencies that might affect such relationships. We then discuss how the aversive character of envy can provoke different types of action on the part of leaders aimed at reducing or eliminating this emotion. Furthermore, we propose different conditions that can increase the likelihood that the leader would choose one of these courses of action over another. Finally, we end with a discussion of the implications of leader-follower social comparisons and envy for research in the leadership field and for practice. 相似文献
133.
David Seaburn Barbara Gawinski Jeff Harp Susan McDaniel Dael Waxman Cleveland Shields 《Journal of marital and family therapy》1993,19(2):177-190
Collaboration between family therapists and physicians has attracted increasing attention in the field of family therapy. Family therapists practicing in medical settings encounter many stimulating oppoutunities and challenges. This paper focuses on the experience of the authors providing family therapy in a primary care medical setting which is also a family medicine residency program. The authors discuss the role of physician and patient expectations in treatment as well as the influence of the medical context on the development of family therpists. 相似文献
134.
In the Age of Terrorism fear becomes a constant companion. This is particularly true in a society already beset by a culture
of fear. We explore some cognitive effects of fear induced by victimization to explain America’s reaction to the events of
9/11. Using reliable measures of value orientations we find that exposure to violence produces a shift in value orientations
toward values that are more self-enhancing. America’s seemingly fractured state may be explained in part by this effect. 相似文献
135.
Jeff Strnad 《Social Choice and Welfare》1985,2(3):181-195
This article consists of several results characterizing neutral monotonic social functions over alternative sets that are compact, convex subsets of Euclidean space. One major result is that a neutral monotonic social function is continuous-valued (i.e., does not make abrupt reversals) for all profiles of continuous-valued weak orderings if and only if it is simple (i.e., completely determined by a single set of decisive coalitions). A second major result is that a continuous-valued neutral monotonic social function will guarantee the existence of a socially undominated alternative for all profiles of continuousvalued, almost convex weak orderings if and only if the smallest empty intersection within the set of decisive coalitions is at least m+2 in size where m is the dimension of the alternative set.Associate Professor of Law, University of Southern California and Assistant Professor of Law and Economics, California Institute of Technology.This article is taken almost directly from a chapter of my Ph.D. dissertation (Strnad 1982). That chapter itself is substantially the same as an earlier paper, Strnad (1981). I have profited greatly from the suggestions, guidance and encouragement of Donald Brown in this work. Strnad (1981) was presented at the California Institute of Technology Theory Workshop in January 1982 and at the annual Public Choice Society Meetings in San Antonio, Texas on March 5–7, 1982. I am grateful to participants at both the Workshop and the Meetings for their comments. Comments by the referee and by Jerry Kramer, the editor, also were very helpful. Any remaining errors are solely my responsibility.Substantial financial support for this work has been provided by Summer Research Grants for 1981 and 1982 from the University of Southern California Law Center 相似文献
136.
John C. Lipscomb Linda K. Teuschler Jeff Swartout Doug Popken Tony Cox Gregory L. Kedderis 《Risk analysis》2003,23(6):1221-1238
Risk assessments include assumptions about sensitive subpopulations, such as the fraction of the general population that is sensitive and the extent that biochemical or physiological attributes influence sensitivity. Uncertainty factors (UF) account for both pharmacokinetic (PK) and pharmacodynamic (PD) components, allowing the inclusion of risk-relevant information to replace default assumptions about PK and PD variance (uncertainty). Large numbers of human organ donor samples and recent advances in methods to extrapolate in vitro enzyme expression and activity data to the intact human enable the investigation of the impact of PK variability on human susceptibility. The hepatotoxicity of trichloroethylene (TCE) is mediated by acid metabolites formed by cytochrome P450 2E1 (CYP2E1) oxidation, and differences in the CYP2E1 expression are hypothesized to affect susceptibility to TCE's liver injury. This study was designed specifically to examine the contribution of statistically quantified variance in enzyme content and activity on the risk of hepatotoxic injury among adult humans. We combined data sets describing (1) the microsomal protein content of human liver, (2) the CYP2E1 content of human liver microsomal protein, and (3) the in vitro Vmax for TCE oxidation by humans. The 5th and 95th percentiles of the resulting distribution (TCE oxidized per minute per gram liver) differed by approximately sixfold. These values were converted to mg TCE oxidized/h/kg body mass and incorporated in a human PBPK model. Simulations of 8-hour inhalation exposure to 50 ppm and oral exposure to 5 micro g TCE/L in 2 L drinking water showed that the amount of TCE oxidized in the liver differs by 2% or less under extreme values of CYP2E1 expression and activity (here, selected as the 5th and 95th percentiles of the resulting distribution). This indicates that differences in enzyme expression and TCE oxidation among the central 90% of the adult human population account for approximately 2% of the difference in production of the risk-relevant PK outcome for TCE-mediated liver injury. Integration of in vitro metabolism information into physiological models may reduce the uncertainties associated with risk contributions of differences in enzyme expression and the UF that represent PK variability. 相似文献
137.
138.
Theory and Society - This paper critically interrogates the usefulness of the concept of violence regimes for social politics, social analysis, and social theory. In the first case, violence... 相似文献
139.
Development of algorithms that estimate the offset between two clocks has received a lot of attention, with the motivating force being data networking applications that require synchronous communication protocols. Recently, statistical modeling techniques have been used to develop improved estimation algorithms with the focus being obtaining robust estimators in terms of mean squared error. In this paper, we extend the use of statistical modeling techniques to address the construction of confidence intervals for the offset parameter. We consider the case where the distributions of network delays are members of a scale family. Our results include an asymptotic confidence interval and a generalized confidence interval in the sense of [S. Weerahandi, Generalized confidence intervals, Journal of the American Statistical Association 88 (1993) 899–905. Correction in vol. 89, p. 726, 1994]. We compare and contrast the two approaches for obtaining a confidence interval, and illustrate specific applications using exponential, Rayleigh and heavy-tailed Weibull network delays as concrete examples. 相似文献
140.