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111.
This paper considers the Cardinality Constrained Quadratic Knapsack Problem (QKP) and the Quadratic Selective Travelling Salesman
Problem (QSTSP). The QKP is a generalization of the Knapsack Problem and the QSTSP is a generalization of the Travelling Salesman
Problem. Thus, both problems are NP hard. The QSTSP and the QKP can be solved using branch-and-cut methods. Good bounds can
be obtained if strong constraints are used. Hence it is important to identify strong or even facet-defining constraints. This
paper studies the polyhedral combinatorics of the QSTSP and the QKP, i.e. amongst others we identify facet-defining constraints
for the QSTSP and the QKP, and provide mathematical proofs that they do indeed define facets.
Author now works at Motorola. (2005 onwards) 相似文献
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113.
Frédéric Dor Pascal Empereur-Bissonnet Denis Zmirou Vincent Nedellec Jean-Marie Haguenoer Frans Jongeneelen Alain Person William Dab Colin Ferguson 《Risk analysis》2003,23(5):1047-1057
Polluted soils have become a public health problem. While population exposure to soil pollutants is generally quantified using multimedia models, their estimations have not been validated, and studies that attempted to do so are scarce. The objective of the SOLEX study was to compare the predictions of pyrene exposure levels (converted into 1 hydroxypyrene) computed by several models with the results of urinary 1-hydropyrene (1-HOP) assays among 110 employees working at three sites polluted during their past use as manufactured gas plants. Four models were used: AERIS (Canada), CalTOX (California, USA), CLEA (UK), and HESP (The Netherlands). Three occupational exposure scenarios--with office, mixed, and outdoor workers--were constructed, based upon job activities during two measurement campaigns, one in winter and one in summer. The exposure levels estimated by the four models could differ markedly (from 7 up to 80 times) according to the exposure scenario. Also, the predominant exposure routes differed according to the model (direct soil ingestion for HESP and CalTOX, inhalation for AERIS, and dermal absorption for CLEA). The predictions of CalTOX are consistent with the 1-HOP measurements for all the scenarios. For HESP, the consistency is observed for the scenarios, office and mixed, for which the pyrene level in the soil is low. AERIS and CLEA yield results that are systematically above the 1-HOP measurements. This study confirms that validation of the models is crucial and points out to the need to proceed to assess components of the models that are the most influential using appropriate statistical analysis in combination with true field data. 相似文献
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115.
Leanne Mak Diane Hiebert-Murphy John R. Walker Gary Altman 《Journal of Family Social Work》2013,16(1):51-67
Collaborative decision making is a central feature of family-centered practice and is important to families in treatment planning. This study explored parents’ preferences for decision making involvement and their information needs regarding treatment for child anxiety. Qualitative interviews conducted with 19 parents revealed four main themes: (1) parents regard themselves as protectors, (2) parents desire involvement in decision making, (3) information is key in decision making, and (4) not all treatments are perceived as equal. Parents reported a strong desire to maintain control over the final treatment decision. They preferred a wide range of information about treatment and the health-care provider. Implications for implementing family-centered practice are discussed. 相似文献
116.
Vincent R. Starnino 《Journal Of Human Behavior In The Social Environment》2013,23(7):820-842
The term recovery has become increasingly popular in the area of mental health care. Recently, it has been described by policy makers as the guiding vision for transforming the mental health system. Problematic, however, is that a lack of clarity continues to exist regarding how recovery is to be defined. Definitional attempts often appear to have competing opinions about what the concept exactly stands for. This causes confusion for both professionals and consumers desiring to adopt a recovery approach. Ken Wilber's integral theory is presented as a framework for organizing and connecting various viewpoints related to the “recovery” concept. Implications for social work are discussed. 相似文献
117.
Research dealing with disproportionate criminality, arrest, and incarceration among African Americans has tended to emphasize cultural, familial, and structural differences between racial groups while at the same time neglecting patterns and processes of race‐ and class‐based antagonism and subordination that are central, especially in the case of the U.S. South historically. We attempt to address this limitation by posing a model of the contemporary black‐white arrest differential across counties of one southern state. The model itself takes into consideration class‐ and race‐based subordination processes and their impact on local levels of stratification and arrest. Results suggest the continuing influence of racial competition and class dynamics. Racial competition enhances the arrest gap by disproportionately increasing unemployment and family dissolution among African Americans. The existence of a strong and concentrated traditional elite is shown to depress the racial gap, presumably by increasing poverty, unemployment, and family dissolution for both groups or by shaping what it means to go to jail, especially for blacks. In general, the arguments and findings presented suggest that criminological literature and theorizing should take note of local racial and political‐economic processes that, through the perpetuation of race and class inequality, reproduce disparate patterns of criminality, arrest, and incarceration. 相似文献
118.
The Bogardus social distance scale, which measures the level of acceptance that Americans feel toward members of the most common ethnic and racial groups in the United States, was administered six times nationally between 1920 and 2001. Replicating the most recent study with its revised list of ethnic and racial groups, the authors of this study analyzed a stratified random sample of 3,166 college students, making it the largest national social distance study ever conducted. The findings indicate an increase since 2001 in the mean level of social distance toward all ethnic groups, as well as in the spread between the groups with the highest and lowest levels of social distance. Further, a consistency between studies in group preferences reaffirms the relevance of the similarity‐attraction bond in accepting those who are racially and culturally different. Mean comparisons and analysis of variance tests also showed that gender, birthplace of respondents and/or their parents, race, and year in college are all significant indicators of the level of social distance toward groups. 相似文献
119.
120.
Hanley Adam W. Dehili Vincent Krzanowski Deidre Barou Daniela Lecy Natalie Garland Eric L. 《Clinical Social Work Journal》2022,50(3):316-324
Clinical Social Work Journal - Interest in mindfulness meditation continues to grow as accumulating evidence suggests mindfulness training encourages more positive functioning. However, basic... 相似文献