首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2643篇
  免费   145篇
各国政治   281篇
工人农民   152篇
世界政治   286篇
外交国际关系   196篇
法律   1340篇
中国政治   71篇
政治理论   444篇
综合类   18篇
  2023年   30篇
  2022年   22篇
  2021年   50篇
  2020年   89篇
  2019年   113篇
  2018年   136篇
  2017年   167篇
  2016年   161篇
  2015年   109篇
  2014年   146篇
  2013年   438篇
  2012年   157篇
  2011年   157篇
  2010年   76篇
  2009年   58篇
  2008年   111篇
  2007年   111篇
  2006年   85篇
  2005年   64篇
  2004年   88篇
  2003年   66篇
  2002年   50篇
  2001年   47篇
  2000年   41篇
  1999年   22篇
  1998年   19篇
  1997年   19篇
  1996年   10篇
  1995年   15篇
  1994年   13篇
  1993年   15篇
  1992年   9篇
  1991年   12篇
  1990年   7篇
  1989年   7篇
  1988年   3篇
  1987年   7篇
  1986年   4篇
  1985年   4篇
  1984年   6篇
  1983年   4篇
  1982年   3篇
  1975年   4篇
  1974年   4篇
  1973年   2篇
  1972年   4篇
  1971年   3篇
  1967年   3篇
  1966年   2篇
  1965年   3篇
排序方式: 共有2788条查询结果,搜索用时 15 毫秒
11.
12.
In the forensic science laboratory, the recovery of spermatozoa from vaginal swabs, or vaginal cells from penile swabs, can help determine if sexual intercourse may have taken place. There are several methods used to recover spermatozoa and cells from the swabs before visualisation on a microscope slide and most of these methods use water. Phosphate buffered saline (PBS) is a non-toxic solution used in many biological laboratories. Unlike water, PBS prevents cells rupturing or shrivelling up due to osmosis. This study demonstrates that PBS can be used for the extraction of spermatozoa and cells from swabs and that PBS does not affect subsequent DNA profiling.  相似文献   
13.
Der Begriff der Landeskultur umfasst alle Maßnahmen zur Verbesserung der land- und forstwirtschaftlichen Nutzung des Bodens einschließlich der Erhaltung der Kulturlandschaft. Landeskultur ist somit alles Planen und Handeln mit dem Ziel, die Umwelt als gegebenes Naturraumpotential, insbesondere Wasser, Boden, Luft und die dazugehörigen Natur-, Kultur- und Sachgüter optimal zu erhalten, gestalten und rationell zu nutzen sowie dieses Potential mit bestmöglicher Qualität als natürliche und kulturelle Lebensgrundlage für die Allgemeinheit nachhaltig zu sichern. Landeskultur dient somit auch der Belebung und Werterhöhung der gebauten und gepflanzten Umwelt. Dies schließt auch und gerade die kulturelle Seite einschließlich Kulturlandschaften mit ein. Dabei ist es bis zur Überprüfung durch das BVerfG noch hinnehmbar, dass der Begriff „Landeskultur“ in Art. 89 Abs. 3 GG wegen der Mischkompetenz von Bund und Land vom BVerwG enger ausgelegt wird als in anderen Rechtsvorschriften.  相似文献   
14.
An analytical method using solid-phase extraction (SPE) and high-performance liquid chromatography–mass spectrometry (LC–MS) has been developed and validated for the confirmation of Δ9-tetrahydrocannabinol (THC) in oral fluid samples. Oral fluid was extracted using Bond Elut LRC-Certify solid-phase extraction columns (10 cm3, 300 mg) and elution performed with n-hexane/ethyl acetate. Quantitation made use of the selected ion-recording mode (SIR) using the most abundant characteristic ion [THC + H+], m/z 315.31 and the fragment ion, m/z 193.13 for confirmation, and m/z 318.00 for the protonated internal standard, [d3-THC + H+]. The method proved to be precise for THC, in terms of both intra-day and inter-day analyses, with coefficients of variation less than 10%, and the calculated extraction efficiencies for THC ranged from 76 to 83%. Calibration standards spiked with THC between 2 and 100 ng/mL showed a linear relationship (r2 = 0.999). The method presented was applied to the oral fluid samples taken from the volunteers during the largest music event in Portugal, named Rock in Rio-Lisboa. Oral fluid was collected from 40 persons by expectoration and with Salivette®. In 55% of the samples obtained by expectorating, THC was detected with concentration ranges from 1033 to 6552 ng/mL and in 45% of cases THC was detected at concentrations between 51 and 937 ng/mL. However, using Salivette® collection, 26 of the 40 cases had an undetectable THC.  相似文献   
15.
International Journal of Politics, Culture, and Society - On the basis of empirical material from a city bordering Syria and Turkey, this article aims to situate the city’s emerging landscape...  相似文献   
16.
LE MONDE ARABE ET MUSULMAN AU MIROIR DE L'UNIVERSITE FRANÇAISE: REPERTOIRE DES THESES SOUTENUES DANS LES UNIVER‐SITES FRANÇAISES, EN SCIENCES DE L'HOMME ET DE LA SOCIETE, SUR LE MONDE ARABE ET MUSULMAN (1973–1987). By MARIE BURGAT, DANIELLE BRUCHET, JACQUELINE QUILET [& others]. Aix‐en‐Provençe, Institut de Recherche et d'Etudes sur le Monde Arabe et Musulman, 1989–92. 4 vols.

MAPAS, PLANOS Y FORTIFICACIONES HISPANICOS DE MARRUECOS (S.XVI‐XX)/CARTES, PLANS ET FORTIFICATIONS HISPANIQUES DU MAROC (XVIe‐XXe S.). By JUAN BTA. VILAR. 604pp. Text in Spanish. Table of Contents, Preface (by José Antonio Calderon Quijano), and Introduction in Spanish and French. Madrid, Ministerio de Asuntos Exteriores, Secretaría de Estado para la Cooperación Internacional y para Iberoamérica: Dirección General de Relaciones Culturales y Científicas, Agencia Española de Cooperación International, Institute de Cooperación con el Mundo Arabe, 1992. 7210 ptas.

A BIOGRAPHICAL DICTIONARY OF CONTEMPORARY AFGHANISTAN. By LUDWIG W. ADAMEC. Graz, Akademische Druck‐ u. Verlagsanstalt, 1987. vi, 252 pp. Photo section. ÖS 450.‐

TÜRKIYE DI?INDAK? TÜRKLER B?BL?YOGRAFYASI. A BIBLIOGRAPHY OF TURKS OUT OF TURKEY. By ?SMET B?NARK and others. Ankara, T.C. Ba?bakanlik Devlet Ar?ivleri Genel Müdürlü?ü Dokümentasyon Dairesi Ba?kanli?i (Yayin No.5), 1992. 2 vols. lxv, 1379 pp.

GULF CRISIS CHRONOLOGY: DAY‐TO‐DAY COVERAGE OF EVENTS IN THE GULF CONFLICT FROM 2 AUGUST 1990 TO THE 3 MARCH 1991 CEASEFIRE. Compiled by the BBC WORLD SERVICE. Harlow, Longman, 1991. 454 pp. £65.‐

FRAUENFRAGEN IM MODERNEN ORIENT: EINE ERGANZUNGSBIBLIO‐GRAPHIE. WOMEN IN THE MIDDLE EAST AND NORTH AFRICA: A SUPPLEMENTARY BIBLIOGRAPHY. By INGEBORG OTTO & MARIANNE SCHMIDT‐DUMONT. (Biblio., 16.) Hamburg, Deutsches Übersee‐Institut, Übersee‐Dokumentation, Referat Vorderer Orient, 1989. xvi, 126 pp. DM19.‐

THE MIDDLE EAST AND NORTH AFRICA 1993. London, Europa Publications, 1992. xxi, 988 pp. £130.  相似文献   

17.
The Satisfaction With Life Scale (SWLS) was developed in the United States as a multiitem scale for the overall assessment of life satisfaction as cognitive-judgmental process, rather as a measurement of specific satisfaction areas (e.g., health, energy). The present study attempted to extend the applicability of the SWLS by investigating specific aspects of reliability and validity in a different cultural context (Portugal) with adolescents. In line with previous American findings, reliability figures were found to be favourable. SWLS scores were affected by sex and sociocultural level. In addition, SWLS scores showed to be predictably associated with psychological measures: loneliness, social anxiety, shyness, self- concept, and physical attractiveness. The variables that best predicted satisfaction were overall self-concept, loneliness, and physical attractiveness.Received a Ph.D. in normal and abnormal anthropology from École des Hautes Études en Sciences Sociales (Paris) in 1980 and a Ph.D. in Social Psychology from Faculty of Psychology (Porto) and an Aggregation in Psychology from Faculty of Psychology (Coimbra) in 1990. Research interests include migration and cross-cultural social migration.The author wishes to thank the anonymous reviewers for their helpful comments on an earlier version of this paper.  相似文献   
18.
19.
Reviews     
The Possessed and the Dispossessed: Spirits, Identity and Power in a Madagascar Migrant Town by Lesley A. Sharp.

University of California Press, Berkeley and London. 1993. xx plus 345 pp. including maps, illustrations, tables, notes, bibliography and index.

Marketing Africa's High Value Foods edited by S. Jaffee and J. Morton. World Bank, Kendall/Hunt Publishing Company, Iowa. 1995. 503 pp. including bibliography and index.

Democratisation and Demilitarisation in Lesotho: The General Election of 1993 and its Aftermath edited by Roger Southall and Tsoeu Petlane. Africa Institute of South Africa, Pretoria. 1995. xvii plus 193 pp. R60 ($30).

A Culture of Censorship: Secrecy and Intellectual Repression in South Africa by Christopher Merrett.

David Philip, Cape Town; University of Natal Press, Pietermaritzburg and Mercer University Press, Macon (Georgia). 1994. xv plus 296 pp. including notes and index. Paperback. Price R54,95.

The Eritrean Question: The Conflict Between the Right of Self‐Deter‐mination and the Interests of States by Eyassu Gayim.

Iustus Förlag AB, Uppsala (Sweden). 1993. 716 pp. including figures, tables, notes, maps, annexures bibliography and index. Paperback.

The Rwanda Crisis 1959–1994 — History of a Genocide by G. Prunier. Hurst & Co. London. 1995. xiii plus 389 pp. Paperback. Price £12.50.

Entrance into Reproductive Life: A Demographic Expression of Socio‐Economic Changes in a Senegalese Rural Area by Valérie Delaunay. Centre Français sur la Population et le Développement (CEPED), Paris. 1994. Les Etudes du CEPED No 7. xxii plus 326 pp. including figures, maps, tables, appendices and bibliography. Paperback. Price 90FF.

Verso un Nuovo Sudafrica: Dall'Apartheid allo Stato Multietnico by Chiara Robertazzi.

Milan: Francoangeli. 1995. 130 pp. Paperback.  相似文献   

20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号