全文获取类型
收费全文 | 22284篇 |
免费 | 1380篇 |
国内免费 | 41篇 |
学科分类
医药卫生 | 23705篇 |
出版年
2024年 | 13篇 |
2023年 | 140篇 |
2022年 | 154篇 |
2021年 | 418篇 |
2020年 | 290篇 |
2019年 | 443篇 |
2018年 | 548篇 |
2017年 | 411篇 |
2016年 | 458篇 |
2015年 | 550篇 |
2014年 | 753篇 |
2013年 | 1129篇 |
2012年 | 1661篇 |
2011年 | 1807篇 |
2010年 | 941篇 |
2009年 | 844篇 |
2008年 | 1543篇 |
2007年 | 1675篇 |
2006年 | 1559篇 |
2005年 | 1548篇 |
2004年 | 1547篇 |
2003年 | 1404篇 |
2002年 | 1392篇 |
2001年 | 217篇 |
2000年 | 138篇 |
1999年 | 173篇 |
1998年 | 260篇 |
1997年 | 223篇 |
1996年 | 157篇 |
1995年 | 175篇 |
1994年 | 156篇 |
1993年 | 118篇 |
1992年 | 101篇 |
1991年 | 77篇 |
1990年 | 54篇 |
1989年 | 59篇 |
1988年 | 55篇 |
1987年 | 54篇 |
1986年 | 35篇 |
1985年 | 60篇 |
1984年 | 54篇 |
1983年 | 49篇 |
1982年 | 59篇 |
1981年 | 54篇 |
1980年 | 32篇 |
1979年 | 19篇 |
1978年 | 16篇 |
1977年 | 11篇 |
1975年 | 7篇 |
1974年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
991.
Steadman HJ Cocozza JJ Dennis DL Lassiter MG Randolph FL Goldman H Blasinsky M 《Administration and policy in mental health》2002,29(6):481-493
A major issue that has long dogged federal human services demonstration programs is the perception that when federal dollars end, the programs end—regardless of any proven successes. Access to Community Care and Effective Services and Supports (ACCESS) was a 5-year federal demonstration project to foster partnerships between service providers for homeless people with serious mental illness and co-occurring substance abuse disorders; and to identify effective, replicable systems integration strategies. After federal funding ended, research teams visited the ACCESS sites to determine which project elements remained and which strategies were used by the sites to continue ACCESS. This article describes ACCESS services and systems integration activities retained by the sites, new funding streams, and strategies used to obtain continued funding. 相似文献
992.
993.
994.
McAdam DB Zarcone JR Hellings J Napolitano DA Schroeder SR 《American journal of mental retardation : AJMR》2002,107(4):261-269
Consumer satisfaction and social validity were measured during a double-blind, placebo-controlled evaluation of the atypical neuroleptic risperidone in treating severe aberrant behavior of persons with developmental disabilities. First, a satisfaction survey was completed after a medication trial by each participant's caregiver. Results showed that 100% of the caregivers felt that participation was a positive experience for themselves and participants. Second, 52 community members viewed videotapes of 5 participants during a clinical interview when they were taking either placebo or risperidone. Raters also indicated that when on the medication, participants displayed fewer aberrant behaviors, were less irritable, in a better mood, and were more responsive to their environment. 相似文献
995.
996.
997.
Pacula RL Chriqui JF Reichmann DA Terry-McElrath YM 《Journal of public health policy》2002,23(4):413-439
Significant attention has been given to the debate regarding allowances for medical marijuana use since the 1996 California and Arizona ballot initiatives. State medical marijuana allowances, however, have existed since the mid-1970s. Much of the current debate stems from confusion about the various ways states approach the issue. In this paper, we present original legal research on current state medical marijuana laws identifying four different ways states statutorily enable the medical use of marijuana. We discuss the tension these approaches have with federal law as well as their implications regarding real access for patients. In addition, we present information on how a small number of states are trying to deal with the issue of access within the context of their medical marijuana laws, and discuss the implication of various supply approaches on the enforcement of other state marijuana laws. 相似文献
998.
Zipfel S Reas DL Thornton C Olmsted MP Williamson DA Gerlinghoff M Herzog W Beumont PJ 《The International journal of eating disorders》2002,31(2):105-117
OBJECTIVE: Partial day hospitalization programs for the treatment of eating disorders are increasingly being developed worldwide. METHOD: First, a systematic database search of day hospitalization programs for eating disorders, published in either English or German, was conducted. Programs that provided sufficient information on their program structure were summarized and compared across various dimensions. Second, the responsible program directors were contacted to provide additional information regarding outcome data, current trends, challenges, and future directions of their programs. Third, outcome data from day programs presented at international conferences were included to expand the base of the review. DISCUSSION: Although the programs from different countries and health care environments varied in terms of their purpose and operated within very different health care systems, many similarities were found to exist, including the use of a multidisciplinary staff and reliance on group treatment as the primary means of therapy. Marked differences were noted in terms of inclusion criteria and intensity of care. 相似文献
999.
Bishop CE Gilden D Blom J Kubisiak J Hakim R Lee A Garnick DW 《Health affairs (Project Hope)》2002,21(6):215-223
Claims for injury care provided to aged fee-for-service (FFS) beneficiaries cost Medicare more than $8 billion in 1999, almost 6 percent of Medicare claims spending for elders. More than one-fifth of aged FFS beneficiaries had an injury that resulted in a claim. Fractures, which were experienced by one in seventeen aged beneficiaries, were responsible far 67 percent of total injury claims expenses. Medicare could realize substantial savings if these injuries could be prevented; the program should consider underwriting effective prevention activities. 相似文献
1000.
French-McCay DP 《Environmental toxicology and chemistry / SETAC》2002,21(10):2080-2094
An oil toxicity and exposure model (OilToxEx) was developed and validated for estimation of impacts to aquatic organisms resulting from acute exposure to spilled oil. Because oil exposure is shorter than the time required for equilibrium between the organism and the water to be reached, the time and temperature dependence of toxicity is addressed. Oil toxicity is a function of aromatic composition and the toxicity of individual aromatics in the mixture. Lethal concentration to 50% of exposed organisms (LC50), as a function of octanol-water partition coefficient (Kow), and an additive model are used to estimate the toxicity of monoaromatic and polycyclic aromatic hydrocarbon mixtures in water-soluble fractions (WSF) and oil-in-water dispersions (OWD) of oil. The toxicity model was verified by comparison with oil bioassay data where the exposure concentrations of aromatics were measured. The observed toxicity in the bioassays could be accounted for by the additive narcotic effects of the dissolved aromatics in the exposure media. Predicted LC50s were compared to those calculated from measured concentrations after spills to verify the exposure model for field conditions. These results indicate that the additive toxicity and exposure model may be used to estimate toxicity of untested oils and spill conditions. 相似文献