全文获取类型
收费全文 | 2649篇 |
免费 | 75篇 |
国内免费 | 3篇 |
专业分类
教育 | 2057篇 |
科学研究 | 75篇 |
各国文化 | 73篇 |
体育 | 150篇 |
文化理论 | 20篇 |
信息传播 | 352篇 |
出版年
2023年 | 30篇 |
2022年 | 33篇 |
2021年 | 61篇 |
2020年 | 88篇 |
2019年 | 129篇 |
2018年 | 185篇 |
2017年 | 190篇 |
2016年 | 163篇 |
2015年 | 101篇 |
2014年 | 125篇 |
2013年 | 557篇 |
2012年 | 92篇 |
2011年 | 71篇 |
2010年 | 50篇 |
2009年 | 71篇 |
2008年 | 78篇 |
2007年 | 63篇 |
2006年 | 51篇 |
2005年 | 59篇 |
2004年 | 64篇 |
2003年 | 46篇 |
2002年 | 32篇 |
2001年 | 22篇 |
2000年 | 28篇 |
1999年 | 30篇 |
1998年 | 15篇 |
1997年 | 15篇 |
1996年 | 19篇 |
1995年 | 24篇 |
1994年 | 7篇 |
1993年 | 13篇 |
1992年 | 7篇 |
1991年 | 11篇 |
1990年 | 11篇 |
1989年 | 8篇 |
1988年 | 11篇 |
1987年 | 5篇 |
1986年 | 11篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 10篇 |
1982年 | 5篇 |
1981年 | 7篇 |
1980年 | 9篇 |
1979年 | 6篇 |
1978年 | 14篇 |
1977年 | 6篇 |
1975年 | 9篇 |
1973年 | 5篇 |
1943年 | 5篇 |
排序方式: 共有2727条查询结果,搜索用时 15 毫秒
181.
Objective
(1) To describe lacerations of the vaginal fornices, an injury known to be associated with consensual sexual intercourse, including known complications and treatment course, (2) to contrast these injuries with injuries sustained during sexual assault, and (3) to discuss the assessment of adolescent patients for sexual injuries.Methods
We present a case series of 4 female adolescent patients seen at a children's hospital over a period of 6 months. Each patient developed significant vaginal bleeding after sexual intercourse, and 3 of the patients presented to the emergency department with vital signs consistent with compensated shock.Results
Each patient was evaluated by pediatric surgery, and found to have a laceration of the vagina. Three of the patients described consensual intercourse prior to the onset of bleeding, and had lacerations of the vaginal fornices; these patients were determined to have injuries resulting from consensual sexual intercourse. The fourth patient reported sexual assault as the cause of her injuries, and was treated for longitudinal lacerations of the vaginal wall.Conclusions
Lacerations of the upper vagina are not frequently reported in forced vaginal intercourse, but are occasionally reported as injuries sustained during consensual coitus. In the absence of reported sexual assault, a severe vaginal fornix laceration is consistent with the diagnosis of coital injury from consensual intercourse. Diagnosis and treatment of this injury can be delayed due to the sensitive nature of these injuries. Bleeding can be profuse, leading to hemorrhagic shock, and these injuries may require transfusion of blood products and surgical repair in some cases. Complications may include hemoperitoneum, pneumoperitoneum, or retroperitoneal hematoma, even in the absence of complete vaginal perforation.Practice implications
Knowledge of the consensual sexual injuries that may occur in adolescent patients can guide diagnosis, treatment, and counseling for the patient and her family, preventing long-term medical complications and legal consequences. 相似文献182.
Nancy Arthur Sarah Flynn 《International Journal for Educational and Vocational Guidance》2011,11(3):221-237
This research focused on the career decision and planning needs of a unique group of migrants: international students who
are completing their studies as temporary immigrants and who are embarking on the career journey of employment and permanent
immigration. A semi-structured interview employing a Critical Incident Technique was used to assess the career influences
of 19 undergraduate and graduate international students at a Canadian university. Data were analyzed using a constant comparison
method and critical incident protocol. Students were motivated to remain in Canada due to enhanced job opportunities and high
standard of living. Barriers to migration included the fear of not securing employment and cultural and linguistic barriers.
International students would like to see campus and career services specified to the needs of international and graduate students
to help them realize their goal of pursuing employment as the key to permanent immigration. 相似文献
183.
Kathryn Elizabeth Linder 《Discourse: Studies in the Cultural Politics of Education》2011,32(3):443-456
Through an application of Foucauldian theories of power and neoliberalism, this article employs an ascending analysis to identify an embedded neoliberal agenda within the documentary 2 Million Minutes. The author argues that this neoliberal agenda serves to support and maintain notions of international white supremacy as it assumes relationships between whiteness and success, American identity and privilege, and through its definition of the global economy as one in which all students can equally take part. By articulating how the film engages in techniques of biopower through a comparative portrayal of high school students from India, China, and the United States, the author argues that representations of education ‘realities’ should be examined and questioned in order to locate powerful and hidden hegemonies. 相似文献
184.
G. Welch R. Purves D. Hargreaves N. Marshall 《British Educational Research Journal》2011,37(2):285-315
The article reports an Economic and Social Research Council‐funded study of the early career experiences of secondary school music teachers in England, set within a wider national picture of decreasing age‐related pupil engagement with school music, career perceptions of music teaching, variable patterns of teacher recruitment and possible mismatches between the musical biographies of young people and intending music teachers. Qualitative and quantitative data were collected from a short‐term longitudinal survey (first questionnaire: n = 74, second questionnaire: n = 29), supplemented by case studies (n = 6) and open‐ended, written questions (n = 20). Analyses suggest that only a half of the newly qualified participants chose to teach full‐time in a mainstream, state‐funded school music classroom. Of these, the majority were faced with a range of early career challenges stemming from curricular, extra‐curricular and non‐curricular school expectations. These included the need to balance their existing musical performer identity with that of being a new teacher. 相似文献
185.
Robert B. Anderson Julius A. Marshall Andrea L’Afflitto 《Journal of The Franklin Institute》2021,358(12):6281-6308
In classical model reference adaptive control (MRAC), the adaptive rates must be tuned to meet multiple competing objectives. Large adaptive rates guarantee rapid convergence of the trajectory tracking error to zero. However, large adaptive rates may also induce saturation of the actuators and excessive overshoots of the closed-loop system’s trajectory tracking error. Conversely, low adaptive rates may produce unsatisfactory trajectory tracking performances. To overcome these limitations, in the classical MRAC framework, the adaptive rates must be tuned through an iterative process. Alternative approaches require to modify the plant’s reference model or the reference command input. This paper presents the first MRAC laws for nonlinear dynamical systems affected by matched and parametric uncertainties that constrain both the closed-loop system’s trajectory tracking error and the control input at all times within user-defined bounds, and enforce a user-defined rate of convergence on the trajectory tracking error. By applying the proposed MRAC laws, the adaptive rates can be set arbitrarily large and both the plant’s reference model and the reference command input can be chosen arbitrarily. The user-defined rate of convergence of the closed-loop plant’s trajectory is enforced by introducing a user-defined auxiliary reference model, which converges to the trajectory tracking error obtained by applying the classical MRAC laws before its transient dynamics has decayed, and steering the trajectory tracking error to the auxiliary reference model at a rate of convergence that is higher than the rate of convergence of the plant’s reference model. The ability of the proposed MRAC laws to prescribe the performance of the closed-loop system’s trajectory tracking error and control input is guaranteed by barrier Lyapunov functions. Numerical simulations illustrate both the applicability of our theoretical results and their effectiveness compared to other techniques such as prescribed performance control, which allows to constrain both the rate of convergence and the maximum overshoot on the trajectory tracking error of uncertain systems. 相似文献
186.
A survey to assess mentoring experiences and attitudes towards work of Pennsylvania academic librarians was conducted in September 2006 with questions concerning mentoring experiences, work experiences, and attitudes towards work. Results of the survey are analyzed for differences among those librarians responding, especially generational differences, and implications for professional associations when developing mentoring programs are discussed. 相似文献
187.
188.
Khan Sarah Kambris Mona El Kouatly Alfalahi Hamda 《Education and Information Technologies》2022,27(3):4141-4169
Education and Information Technologies - Owing to COVID-19 the Ministry of Education in the United Arab Emirates mandated educational institutions to shift to remote learning. In this study the... 相似文献
189.
Research supports an explicit-reflective approach to teaching about nature of science (NOS), but little is reported on teachers’ journeys as they attempt to integrate NOS into everyday lessons. This participatory action research paper reports the challenges and successes encountered by an in-service teacher, Sarah, implementing NOS for the first time throughout four units of a community college biology course (genetics, molecular biology, evolution, and ecology). Through the action research cycles of planning, implementing, and reflecting, Sarah identified areas of challenge and success. This paper reports emergent themes that assisted her in successfully embedding NOS within the science content. Data include weekly lesson plans and pre/post reflective journaling before and after each lesson of this lecture/lab combination class that met twice a week. This course was taught back to back semesters, and this study is based on the results of a year-long process. Developing pedagogical content knowledge (PCK) for NOS involves coming to understand the overlaps and connections between NOS, other science subject matter, pedagogical strategies, and student learning. Sarah found that through action research she was able to grow and assimilate her understanding of NOS within the biology content she was teaching. A shift in orientation toward teaching products of science to teaching science processes was a necessary shift for NOS pedagogical success. This process enabled Sarah’s development of PCK for NOS. As a practical example of putting research-based instructional recommendations into practice, this study may be very useful for other teachers who are learning to teach NOS. 相似文献
190.