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61.
Urbanization is a major global change inducing complex and multiple modifications of landscapes and ecosystems. The spatial distributions of organisms experiencing these modifications will likely shift specifically, depending on each species’ response to each environmental modification induced by urbanization. We sampled two ant genera (Lasius and Tetramorium) at 1248 locations along an urbanization gradient in Lyon, France and used high resolution spatial layers for 18 spatial (e.g., open habitat fragmentation, bioclimatic data and surface temperatures) and temporal (e.g., comparison of Normalized Difference Vegetation Index between 1986 and 2015) environmental variables associated with urbanization. Coupling two different analytical methods (Outlying Mean Index and Boosted Regression Trees), we showed that each species’ distribution was influenced by its own combination of environmental factors. Two morphologically cryptic Tetramorium species (T. sp.E and T. sp.U2) were both highly abundant but with opposite responses to urbanization: while T. sp.E was favored by urbanized habitat, T. sp.U2 avoided urbanized areas. Among Lasius species, we detected 63 occurrences of the invasive ant Lasius neglectus, the distribution of which was favored only by embankments along roads. We found that, even at this reduced spatial scale, climatic effects influenced most species and interacted with urbanization factors.  相似文献   
62.
In this paper, we investigate whether educational inequalities stem from differences between families or within families. In a poor economy, schooling is costly for parents, and education is likely to be unequally distributed among siblings. Drawing on discrete ordered choice models, we present a simple method to estimate the between and within components of both the explained and unexplained variance in education. For our empirical analysis, we use the Living Standard Measurement Study survey conducted in 2002 in Albania. We explain about 40% of the total variance and find that inequalities in education are mainly due to differences between families. Differences within families are smaller and are far less easily explained.  相似文献   
63.
This paper explores the daily (micro)mobilities that youth with a visual or auditory impairment use to sustain well-being. Geographical research suggests that mobility is a universal phenomenon referred to the capacity to navigate one’s way through different spaces and places. Using a qualitative cross-cultural, visual methods approach to research with vulnerable youth, including four participants with visual or auditory impairments, we demonstrate that everyday patterns of (micro)mobilities through the youth’s home, school and community help disabled youth create pathways to resilience. The implications of these findings are discussed in relation to services that promote resilience against ableist beliefs.  相似文献   
64.

We propose a semiparametric framework based on sliced inverse regression (SIR) to address the issue of variable selection in functional regression. SIR is an effective method for dimension reduction which computes a linear projection of the predictors in a low-dimensional space, without loss of information on the regression. In order to deal with the high dimensionality of the predictors, we consider penalized versions of SIR: ridge and sparse. We extend the approaches of variable selection developed for multidimensional SIR to select intervals that form a partition of the definition domain of the functional predictors. Selecting entire intervals rather than separated evaluation points improves the interpretability of the estimated coefficients in the functional framework. A fully automated iterative procedure is proposed to find the critical (interpretable) intervals. The approach is proved efficient on simulated and real data. The method is implemented in the R package SISIR available on CRAN at https://cran.r-project.org/package=SISIR.

  相似文献   
65.
This article is a short narrative on how feminism helped me find a balance in my life and how this balance has been disrupted with the COVID‐19 crisis. I reflect on how this crisis is showing our vulnerabilities as human beings. This crisis reflects how our bodies depend on each other, moving away from the dominant patriarchal ontology that perceives bodies as being independent. This crisis is letting the most vulnerable in situations of survival because the infrastructures that support their bodies are not functioning. At the same time, this crisis is providing visibility to certain occupations that are dominated by issues of race, class and gender. These occupations are being at least temporarily rehabilitated to their central position in society. We are living a time where we could show, through our teaching, possible resistance to the neoliberal ontology that captured humanity.  相似文献   
66.
All‐volunteer nonprofit organizations rely solely on the commitment of volunteers to support their operations. As such, it is important that leaders of these organizations, even though they are volunteers themselves, rely on professional skills in order to optimize their organization's volunteers capacity. In the present study, we investigated how volunteer leaders' reliance on effective management processes and a (de)motivating leadership style related to volunteers capacity. To this end, we relied on the Competing Values Framework (CVF) and Self‐Determination Theory (SDT), respectively. Results revealed a positive (unique) association between (the sum score of) the management processes of the CVF models, as well as (the sum score of) the motivating leadership styles and volunteers capacity. Bivariate analyses indicated that the management processes of each CVF model (i.e., human relations model, internal process model, open system model, and rational goal model) and each motivating leadership style (i.e., an autonomy‐supportive and a structuring leadership style) related positively to volunteers capacity. These findings have important practical implications as they revealed that it is crucial for volunteer leaders to implement effective management processes, while adopting a motivating leadership style.  相似文献   
67.
This theoretical paper explores the role of social representations in the construction of social reality. Even though this question has been the subject of many debates, the actual processes and mechanisms through which social representations contribute to the construction of social reality have rarely been explored. Citing key works on the topic, the paper explores the role of the genesis of social representations in this process. Each stage of the objectification of social representations (selective construction, structuring schematization, and naturalization) is examined in detail. A more in‐depth analysis of the naturalization process is provided by dividing it into four phases: (1) recognition; (2) elimination of contradictions; (3) instrumental use; and (4) validation through experience. These phases are illustrated using the example of the construction of the social object of drugs in our contemporary society. The present examination of the naturalization process in relation to drugs reveals the mechanisms through which the reality of drugs as a social problem has been constructed and reproduced in our society.  相似文献   
68.
With the increase in asylum-related immigration since 2015, understanding how immigrants settle in a new country is at the centre of social and political debate in European countries. The objective of this study is to determine whether the necessary time to settle for Sub-Saharan Africa immigrants in France depends more on pre-migratory characteristics or on the structural features of the host society. Taking a capability approach, we define settlement as the acquisition of three basic resources: a personal dwelling, a legal permit of a least 1 year and paid work. We use data from the PARCOURS survey, a life-event history survey conducted from 2012 to 2013 that collected 513 life histories of Sub-Saharan African immigrants living in France. Situations regarding housing, legal status and activity were documented year by year since the arrival of the respondent. We use a Kaplan–Meier analysis and chronograms to describe the time needed for settlement, first for each resource (personal dwelling, legal permit and paid work) and then for the combined indicator of settlement. Discrete-time logistic regressions are used to model the determinants of this settlement process. Overall, women and men require 6 and 7 years (medians), respectively, to acquire basic resources in France. This represents a strikingly long period of time in which immigrants lack basic security. The settlement process varies according to gender, but very few sociodemographic factors influence settlement dynamics. Therefore, the length of the settlement process may be due to structural features of the host society.  相似文献   
69.
Using former maps, geographers intend to study the evolution of the land cover in order to have a prospective approach on the future landscape; predictions of the future land cover, by the use of older maps and environmental variables, are usually done through the GIS (Geographic Information System). We propose here to confront this classical geographical approach with statistical approaches: a linear parametric model (polychotomous regression modeling) and a nonparametric one (multilayer perceptron). These methodologies have been tested on two real areas on which the land cover is known at various dates; this allows us to emphasize the benefit of these two statistical approaches compared to GIS and to discuss the way GIS could be improved by the use of statistical models.  相似文献   
70.
Using results from two contingent valuation surveys conducted in Canada and the U.S., we explore the effect of a latency period on willingness to pay (WTP) for reduced mortality risk using a structural model. We find that delaying the time at which the risk reduction occurs by 10 to 30 years reduces WTP by more than 60% for respondents in both samples aged 40 to 60 years. The implicit discount rates are equal to 3.0–8.6% for Canada and 1.3–5.6% for the U.S. JEL Classification Q51 · Q58 The findings, interpretations and conclusions expressed in this paper are entirely those of the authors. They do not necessarily represent the views of the USEPA or of the World Bank, its Executive Directors or the countries they represent.  相似文献   
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