全文获取类型
收费全文 | 4899篇 |
免费 | 160篇 |
国内免费 | 32篇 |
专业分类
管理学 | 19篇 |
民族学 | 35篇 |
人才学 | 2篇 |
人口学 | 32篇 |
丛书文集 | 461篇 |
理论方法论 | 60篇 |
综合类 | 3451篇 |
社会学 | 244篇 |
统计学 | 787篇 |
出版年
2024年 | 1篇 |
2023年 | 12篇 |
2022年 | 11篇 |
2021年 | 25篇 |
2020年 | 35篇 |
2019年 | 69篇 |
2018年 | 76篇 |
2017年 | 96篇 |
2016年 | 99篇 |
2015年 | 114篇 |
2014年 | 224篇 |
2013年 | 619篇 |
2012年 | 328篇 |
2011年 | 332篇 |
2010年 | 285篇 |
2009年 | 319篇 |
2008年 | 339篇 |
2007年 | 387篇 |
2006年 | 354篇 |
2005年 | 331篇 |
2004年 | 237篇 |
2003年 | 228篇 |
2002年 | 189篇 |
2001年 | 125篇 |
2000年 | 105篇 |
1999年 | 29篇 |
1998年 | 14篇 |
1997年 | 12篇 |
1996年 | 18篇 |
1995年 | 13篇 |
1994年 | 13篇 |
1993年 | 8篇 |
1992年 | 9篇 |
1991年 | 3篇 |
1990年 | 9篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1975年 | 2篇 |
排序方式: 共有5091条查询结果,搜索用时 15 毫秒
1.
Cathy W. S. Chen Hong Than-Thi Mike K. P. So 《Journal of Statistical Computation and Simulation》2019,89(2):191-210
This paper proposes a new hysteretic vector autoregressive (HVAR) model in which the regime switching may be delayed when the hysteresis variable lies in a hysteresis zone. We integrate an adapted multivariate Student-t distribution from amending the scale mixtures of normal distributions. This HVAR model allows for a higher degree of flexibility in the degrees of freedom for each time series. We use the proposed model to test for a causal relationship between any two target time series. Using posterior odds ratios, we overcome the limitations of the classical approach to multiple testing. Both simulated and real examples herein help illustrate the suggested methods. We apply the proposed HVAR model to investigate the causal relationship between the quarterly growth rates of gross domestic product of United Kingdom and United States. Moreover, we check the pairwise lagged dependence of daily PM2.5 levels in three districts of Taipei. 相似文献
2.
3.
Polly Yeung Hannah Mooney Awhina English Kieran O’Donoghue 《Social Work Education》2020,39(5):681-698
ABSTRACT The current study used a sequential, exploratory mixed-method design to explore how a social work study scholarship implemented in Aotearoa New Zealand impacted on recipients’ qualification completion and their professional and practice competence. Phase one involved 13 individual interviews with past award recipients which described how the study award impacted on their qualification completion. Thematic analysis was used to extract themes. These themes were examined in the second phase through a quantitative battery completed by 107 past recipients to examine their professional and practice competence. The findings from interviews showed the award enabled recipients to complete their studies and improve their social work practice without causing undue stress or financial pressure on the recipient and their family. Quantitative analysis corroborated and extended these findings to demonstrate that the award contributed to lifting the level of social work knowledge, competence, and skills in the recipients. Accompanying the successful qualification completion, these qualified social workers were equipped with essential skills, promoting social work values and competence to contribute and safeguard the benefit of children, families, and communities. The awards offered a ‘wrap around’ support and was not limited by age or ethnicity but provided a support system to achieve qualification completion. 相似文献
4.
David L. Albright Kelli Godfrey Justin T. McDaniel Kari L. Fletcher Kate H. Thomas Jessica Bertram 《Journal of American college health : J of ACH》2020,68(3):263-270
AbstractObjective: The purpose of this study was to explore differences in oral health among students by military service status in postsecondary settings. Participants: Secondary data were obtained from the American College Health Association’s 2011–2014 National College Health Assessment II. Method: Demographic characteristics of the study sample were explored by calculating frequencies and percentages by military service status. Research questions were explored with maximum likelihood multiple logistic regression. Results: Service member and veteran students are at greater risk for neglecting health behaviors associated with positive oral health, including that they were less likely to get dental exams and that those who deployed in the past were the least likely to be practicing good oral health. Conclusions: The results suggest that improving oral health will contribute to improving health and mental health outcomes in this population, and provide important information for health specialists working with service members and veterans on college campuses. 相似文献
5.
Yiyang Liu Jacob D. Ball Amy L. Elliott Michelle Jacobs-Elliott Guy Nicolette 《Journal of American college health : J of ACH》2020,68(6):575-578
AbstractObjective: Cocaine use is increasing. Comorbidities and diagnostic sequencing are needed among college students to inform treatment of cocaine use disorder (CUD). Method: Using electronic medical records from the psychiatric clinic at the student health care center of a large, public university from 2005 to 2015, patients diagnosed with CUD were identified. Their top mental health conditions were identified and assessed to see whether the first diagnosis of these conditions was made (1) before, (2) at the same time as, or (3) after the first diagnosis of CUD. Results: Among the 50 CUD patients, their most common mental health comorbidities were alcohol use disorder, anxiety, depression, and cannabis use disorder. Anxiety and depression were likely to be diagnosed before CUD; alcohol and cannabis use disorders were likely to be diagnosed concurrently with CUD. Conclusion: Diagnostic sequencing can be used to inform screening, workup, and treatment for patients with CUD. 相似文献
6.
Kayla Sandler Tuhina Srivastava Oluwatunmise A. Fawole Caitlin Fasano 《Journal of American college health : J of ACH》2020,68(6):593-602
AbstractObjective: We aimed to explore knowledge, attitudes, and beliefs about vaccines required for college-entry and vaccine-related behaviors among college students. Participants: Thirty-three full-time undergraduate students, ≥ 18 years old, enrolled at public (2) and private (3) colleges and universities in metropolitan Philadelphia in fall 2016. Methods: We conducted semistructured interviews, which were double-coded with 5,015 comments overall and 99.3% intercoder reliability (κ?=?0.779) using NVivo 11 software. Results: Six key themes emerged: (1) low knowledge about vaccines and requirements; (2) mixed attitudes about required vs. recommended vaccines; (3) high trust in medical professionals; (4) low perceived risk for vaccine-preventable disease outbreaks; (5) substantial parental influence on students’ decision-making; and (6) low utilization of Student Health Services. Conclusions: This study revealed lack of knowledge about and low prioritization of vaccination despite overall positive attitudes towards vaccines. Prematriculation education of college students is critical to increasing vaccine knowledge and use. 相似文献
7.
Abstract Many campuses are seeing increased needs for support in scholarly communications areas such as open access, research identity management, scholarship metrics, and related topics. This article discusses a professional development program that addresses scholarly communications needs for online and in-person graduate students and faculty at UNC Greensboro (UNCG), through a collaborative, interdepartmental effort that brings together librarians from the departments of Research, Outreach, and Instruction (ROI) and Technical Services. The authors provide a brief overview of the literature related to scholarly communications needs and training in academic libraries and discuss the UNCG program’s inception, modules, format, assessment, and future directions. 相似文献
8.
Nuttanan Wichitaksorn 《统计学通讯:理论与方法》2020,49(8):1801-1817
AbstractThis article proposes a new approach to analyze multiple vector autoregressive (VAR) models that render us a newly constructed matrix autoregressive (MtAR) model based on a matrix-variate normal distribution with two covariance matrices. The MtAR is a generalization of VAR models where the two covariance matrices allow the extension of MtAR to a structural MtAR analysis. The proposed MtAR can also incorporate different lag orders across VAR systems that provide more flexibility to the model. The estimation results from a simulation study and an empirical study on macroeconomic application show favorable performance of our proposed models and method. 相似文献
9.
武晓霞 《浙江树人大学学报》2015,(4)
微博作为新媒体领域的一个重要平台,已经渗透到高校学生学习、生活的各个方面,其教育载体的属性已然显现。然而,目前民办高校学生党建微博平台的建设尚处于起步阶段。民办高校应充分认识构建学生党建微博平台的必要性,探索其可行性路径,思考其深层次问题,不断提高学生党建平台建设的现代化水平。 相似文献
10.
In this article, the expected total costs of three kinds of quality cost functions for the one-sided sequential screening procedure based on the individual misclassification error are obtained, where the expected total cost is the sum of the expected cost of inspection, the expected cost of rejection, and the expected cost of quality. The computational formulas for three kinds of expected total costs are derived when k screening variables are allocated into r stages. The optimal allocation combination is determined based on the criterion of minimum expected total cost. At last, we give one example to illustrate the selection of the optimal allocation combination for the sequential screening procedure. 相似文献