全文获取类型
收费全文 | 5643篇 |
免费 | 117篇 |
专业分类
管理学 | 787篇 |
民族学 | 23篇 |
人才学 | 6篇 |
人口学 | 534篇 |
丛书文集 | 16篇 |
理论方法论 | 489篇 |
综合类 | 64篇 |
社会学 | 2606篇 |
统计学 | 1235篇 |
出版年
2021年 | 38篇 |
2020年 | 76篇 |
2019年 | 110篇 |
2018年 | 123篇 |
2017年 | 193篇 |
2016年 | 119篇 |
2015年 | 84篇 |
2014年 | 106篇 |
2013年 | 956篇 |
2012年 | 203篇 |
2011年 | 152篇 |
2010年 | 110篇 |
2009年 | 108篇 |
2008年 | 119篇 |
2007年 | 138篇 |
2006年 | 124篇 |
2005年 | 128篇 |
2004年 | 123篇 |
2003年 | 91篇 |
2002年 | 116篇 |
2001年 | 140篇 |
2000年 | 104篇 |
1999年 | 128篇 |
1998年 | 103篇 |
1997年 | 109篇 |
1996年 | 77篇 |
1995年 | 81篇 |
1994年 | 95篇 |
1993年 | 79篇 |
1992年 | 90篇 |
1991年 | 77篇 |
1990年 | 85篇 |
1989年 | 82篇 |
1988年 | 92篇 |
1987年 | 84篇 |
1986年 | 78篇 |
1985年 | 87篇 |
1984年 | 69篇 |
1983年 | 71篇 |
1982年 | 67篇 |
1981年 | 63篇 |
1980年 | 57篇 |
1979年 | 76篇 |
1978年 | 63篇 |
1977年 | 51篇 |
1976年 | 60篇 |
1975年 | 60篇 |
1974年 | 36篇 |
1973年 | 40篇 |
1971年 | 31篇 |
排序方式: 共有5760条查询结果,搜索用时 140 毫秒
991.
Susan F. Grossman Marta Lundy Cathy Bertrand Cynthia Ortiz Grace Tomas-Tolentino Kim Ritzema 《Journal of child sexual abuse》2013,22(6):655-672
This analysis compared the characteristics and service patterns of adult survivors of childhood sexual assault/abuse and adult survivors of adult sexual assault/abuse. Utilizing data from sexual assault crisis centers serving survivors in a Midwestern state over a six year period and controlling for revictimization, we describe and compare the demographic characteristics, referral sources, and service patterns of the two groups. Results indicate that paths into service differ for the two groups. Furthermore, adult survivors of childhood sexual assault/abuse obtain significantly more hours of service and service contacts on average than adult survivors of adult sexual assault/abuse. Implications for policy and practice are discussed. 相似文献
992.
In this article, we developed a theoretical frame to analyze how practical-moral knowledge structures the regulatory processes of learning to control and direct behavior during literacy lessons in two elementary classrooms. We describe how regulatory behaviors were congruent with the local social and moral order, constituents of practical-moral knowledge. Variance in the practical-moral knowledge of each classroom revealed two different patterns of regulation: (a) a toggle or shift from other-regulation to self-regulation, with an emphasis on other-regulation and (b) a dynamic pattern of fluid shifts between other-regulation, coregulation, and self-regulation, with an emphasis on coregulation. We argue that regulatory processes do not originate within the individual but rather in and through learning practices. 相似文献
993.
N. A. McEnroe J. M. Buttle J. Marsalek F. R. Pick M. A. Xenopoulos P. C. Frost 《Urban Ecosystems》2013,16(2):327-339
We examined whether relatively small urban ponds behave as ‘completely mixed reactors’ by measuring the stability and vertical heterogeneity of water column parameters. To do this, we measured profiles of water temperature and conductivity from the pond surface to the water-sediment interface twice during summer 2009 in 45 stormwater ponds located in the residential landscape of southern Ontario. These data were used to calculate water column stability indices and examine the relative importance of temperature and conductivity in controlling water column stratification. We also measured concentrations of dissolved oxygen (DO), dissolved organic carbon (DOC), total dissolved phosphorus (TDP),total dissolved nitrogen (TDN), particulate phosphorus and nitrogen (seston P and N), chlorophyll a (Chl-a), and total suspended solids (TSS) in surface and bottom waters. Despite their shallow depth (0.50–2.8 m), most ponds were stratified on the day of sampling and had relatively stable water columns both in June and August. Temperature differences rather than conductivity differences were better related to water column stability. Despite relatively stable water columns, vertical differences were not found for most water chemistry parameters, suggesting either recent mixing or relatively slow biogeochemical processing. Top-bottom differences were observed in June and August for DO and in June for TDN, seston N and TSS, reflecting a combination of processes influencing water column chemistry. 相似文献
994.
995.
F Jockenhövel 《The aging male》2013,16(4):319-324
Testosterone therapy has been used for more than 60 years in the treatment of male hypogonadism. The classical forms of hypogonadism are comprised of primary testicular failure or insufficient testicular stimulation due to the lack of pituitary gonadotropins. Typical causes of primary hypogonadism are Klinefelter's syndrome, anorchia or acquired disturbances of testicular function. Secondary hypogonadism is characterized by insufficient production of pituitary gonadotropins, due either to pituitary failure or defects at the hypothalamic level. It is unequivocally accepted in clinical practice that any male with inadequately low testosterone production for his age will require androgen therapy. In addition to the classical forms of hypogonadism, the past decade of research has clearly demonstrated that, with increasing age, many men will suffer from decreasing testosterone production. About 15-25% of men over the age of 50 years will experience serum testosterone levels well below the threshold considered normal for men between 20 and 40 years of age. Studies substituting testosterone in elderly men with low serum testosterone have shown that men with clinical symptoms identical to the symptomatology of classical hypogonadism will benefit most from such therapy. Therefore, it is the general consensus to treat men with age-related hypogonadism only when clinical symptoms are present that can be potentially corrected by testosterone administration. Until recently, intramuscular injections of esters, such as testosterone enanthate, have been the mainstay of testosterone therapy. The introduction of testosterone patches has not challenged this approach, since many users of patches suffer from moderate to severe skin reactions. Some oral testosterone formulations have proven to be problematic, as absorption can be variable, bioavailability is frequently poor, due to the first-pass effect of the liver, and frequent administration is often required<citeref rid="b1"><emph>1</emph></citeref>. Oral testosterone undecanoate avoids, at least partially, the first-pass effect of the liver. However, plasma testosterone levels generally undergo large fluctuations<citeref rid="b2"><emph>2</emph></citeref>. The large fluctuations in serum testosterone levels caused by conventional intramuscular injections result in unsatisfactory shifts in mood and sexual function in some men, which, combined with the frequency of injections, make the intramuscular mode of delivery far from ideal. Recently, a hydroalcoholic gel containing 1% testosterone has proven to be as efficient as a testosterone patch, but with fewer side-effects and a higher grade of patient satisfaction<citeref rid="b3"><emph>3</emph></citeref>-<citeref rid="b4"></citeref><citeref rid="b5"><emph>5</emph></citeref>. Doses of 50-100 mg gel applied once daily on the skin deliver sufficient amounts of testosterone to restore normal hormonal values and correct the signs and symptoms of hypogonadism. The gel has been shown to be effective and successful in patients in the United States, who have benefited from its availability for almost 3 years. In the near future, intramuscular injections of testosterone undecanoate will become commercially available. Such injections have a very favorable pharmacokinetic profile, with one injection every 3 months maintaining serum testosterone well within the normal range. In phase III studies, intramuscular testosterone undecanoate proved to be as efficient as testosterone enanthate, with only one-quarter of the number of injections required and more stable serum testosterone levels. Thus, the new application modes - hydroalcoholic gel (for example, Testogel®, Schering AG, Germany) and intramuscular testosterone undecanoate (Nebido®, Schering AG, Germany) - appear to be the methods of choice in the near future, one being very suitable for hormone therapy in elderly men, the other for long-term substitution in classical forms of hypogonadism. 相似文献
996.
997.
Ecological sabotage (ecotage) has been a feature of the more radical parts of the environmental movement in the Western world for several decades. While it may be perceived as being the preserve of underground cells of 'eco-terrorists', in the UK those who carry out small-scale acts of sabotage are also often engaged in relatively conventional political activity; view sabotage as a complement to other action, not as an end in itself; and are committed to avoiding physical harm to people. Drawing on ethnographic data from research with British activists, this article seeks to define ecotage and to explain its place in the repertoires of the environmental direct action movement in the UK. It is argued that the self-limiting form of ecotage in the UK has its roots in cross-movement debates that have developed over several decades and that national traditions remain important in understanding the development of social movement repertoires. 相似文献
998.
999.
1000.
Joseph J. Deogracias Laurel L. Johnson Heino F. L. Meyer-Bahlburg Suzanne J. Kessler Justine M. Schober 《Journal of sex research》2013,50(4):370-379
The present study reports on the construction of a dimensional measure of gender identity (gender dysphoria) for adolescents and adults. The 27-item gender identity/gender dysphoria questionnaire for adolescents and adults (GIDYQ-AA) was administered to 389 university students (heterosexual and nonheterosexual) and 73 clinic-referred patients with gender identity disorder. Principal axis factor analysis indicated that a one-factor solution, accounting for 61.3% of the total variance, best fits the data. Factor loadings were all ≥ .30 (median, .82; range, .34–.96). A mean total score (Cronbach's alpha, .97) was computed, which showed strong evidence for discriminant validity in that the gender identity patients had significantly more gender dysphoria than both the heterosexual and nonheterosexual university students. Using a cut-point of 3.00, we found the sensitivity was 90.4% for the gender identity patients and specificity was 99.7% for the controls. The utility of the GIDYQ-AA is discussed. 相似文献