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排序方式: 共有450条查询结果,搜索用时 15 毫秒
1.
Oliveira Flávio G. Tapisso Joaquim T. von Merten Sophie Rychlik Leszek Fonseca Paulo J. Mathias Maria da Luz 《Urban Ecosystems》2021,24(5):851-862
Urban Ecosystems - The development of urban areas imposes challenges that wildlife must adapt to in order to persist in these new habitats. One of the greatest changes brought by urbanization has... 相似文献
2.
Prof. Dr. Rainer Schnell 《KZfSS K?lner Zeitschrift für Soziologie und Sozialpsychologie》2002,54(1):147-156
Reuband’s article purports to report empirical results that seem to contradict the widely held view of mail surveys. This assertion is made possible only by an unclear statement of hypotheses and a selective perception of the literature. The data analysis is based on techniques from the 1960s and 1970s; modern methods are not even mentioned. Although all the results reported in the article are based on local surveys conducted by a university institute, these are generalized to national surveys in general. The main points of this critique are methodological: careless literature review, lack of concrete hypotheses, inefficient data analysis and generalizations without empirical foundation. 相似文献
3.
4.
Laura Bernardi Andreas Klärner Holger von der Lippe 《Revue europeenne de demographie》2008,24(3):287-313
This article contributes to the ongoing debate on the economic determinants of fertility behavior by addressing the role of
job insecurity in couples’ intentions concerning parenthood and its timing. It starts from the hypothesis that cultural values
moderate individuals’ reactions to job insecurity and the way it is related to family formation. With a systematic thematic
content analysis of a set of semi-structured interviews with childless men and women around the age of 30 in eastern and western
Germany, we are able to show that there are substantial differences in the consequences of job insecurity on intentions to
have a first child. In western Germany, a relatively secure job career is expected to precede family formation, and this sequence
of transitions is rather rigid, whereas in eastern Germany job security and family formation are thought of and practiced
as parallel investments. We suggest that the lack of convergence in family formation patterns between eastern and western
Germany after the unification of the country in 1990 is partially related to different attitudes toward job insecurity in
the two contexts. 相似文献
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6.
Ohne Zusammenfassung
Rede zum 100. Geburtstag auf einer Veranstaltung der Stadt K?ln, der René-K?nig-Gesellschaft und des Westdeutschen Rundfunks
K?ln am 11. Mai 2006 in K?ln 相似文献
7.
Approximation of a density by another density is considered in the case of different dimensionalities of the distributions. The results have been derived by inverting expansions of characteristic functions with the help of matrix techniques. The approximations obtained are all functions of cumulant differences and derivatives of the approximating density. The multivariate Edgeworth expansion follows from the results as a special case. Furthermore, the density functions of the trace and eigenvalues of the sample covariance matrix are approximated by the multivariate normal density and a numerical example is given 相似文献
8.
The Web proxy location problem in general networks is an NP-hard problem. In this paper, we study the problem in networks showing a general tree of rings topology. We improve the results of the tree case in literature and get an exact algorithm with time complexity O(nhk), where n is the number of nodes in the tree, h is the height of the tree (the server is in the root of the tree), and k is the number of web proxies to be placed in the net. For the case of networks with a general tree of rings topology we present an exact algorithm with O(kn
2) time complexity.This research has been supported by NSF of China (No. 10371028) and the Educational Department grant of Zhejiang Province (No. 20030622). 相似文献
9.
Burge E Kuhne N Berchtold A Maupetit C von Gunten A 《European review of aging and physical activity》2012,9(1):27-39
The objectives of this study were to describe the different modalities of physical activity programs designed for moderate
to severe dementia and to identify their impact on functional independence in activities of daily living (ADL). A critical
review of randomized controlled trials related to the impact of physical activity programs in moderately to severely demented
persons on ADL performance and meta-analysis of the identified studies were performed. Among the 303 identified articles,
five responded to the selection criteria. Four out of the five studies demonstrated limited methodological quality. In one
high-quality study, physical activity programs significantly delayed deterioration of ADL performance. The program components
and ADL assessment tools vary widely across studies. Although the proposed treatments have not proven their efficiency in
improving the ADL status of the patients, they were able to limit the decline in ADL functioning. Future research is warranted
in order to identify clinically relevant modalities for physical activity programs for people with moderate to severe dementia. 相似文献
10.