全文获取类型
收费全文 | 3335篇 |
免费 | 141篇 |
国内免费 | 36篇 |
专业分类
管理学 | 165篇 |
劳动科学 | 12篇 |
民族学 | 81篇 |
人口学 | 79篇 |
丛书文集 | 793篇 |
理论方法论 | 174篇 |
综合类 | 1843篇 |
社会学 | 172篇 |
统计学 | 193篇 |
出版年
2024年 | 4篇 |
2023年 | 13篇 |
2022年 | 43篇 |
2021年 | 68篇 |
2020年 | 32篇 |
2019年 | 23篇 |
2018年 | 47篇 |
2017年 | 78篇 |
2016年 | 56篇 |
2015年 | 124篇 |
2014年 | 144篇 |
2013年 | 180篇 |
2012年 | 173篇 |
2011年 | 248篇 |
2010年 | 227篇 |
2009年 | 257篇 |
2008年 | 234篇 |
2007年 | 253篇 |
2006年 | 235篇 |
2005年 | 224篇 |
2004年 | 128篇 |
2003年 | 110篇 |
2002年 | 148篇 |
2001年 | 133篇 |
2000年 | 85篇 |
1999年 | 56篇 |
1998年 | 36篇 |
1997年 | 29篇 |
1996年 | 31篇 |
1995年 | 25篇 |
1994年 | 17篇 |
1993年 | 15篇 |
1992年 | 9篇 |
1991年 | 4篇 |
1990年 | 7篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有3512条查询结果,搜索用时 15 毫秒
71.
介绍了上海理工大学光电信息与计算机工程学院通过全英教学和互动交流提升研究生学术和专业素养的一些实践和探索。针对上海理工大学研究生教育的国际化程度不足以及研究生在国际上学术和专业交流能力不足等问题,通过包括开设全英研究生课程,邀请海内外知名学者和企业专家授课,混合研究生与留学生共同授课等方式,为研究生提供国际化的教学环境,培养研究生的多方位思维,提升研究生学术和专业的国际化交流能力。 相似文献
72.
73.
We study nonlinear least-squares problem that can be transformed to linear problem by change of variables. We derive a general formula for the statistically optimal weights and prove that the resulting linear regression gives an optimal estimate (which satisfies an analogue of the Rao-Cramer lower bound) in the limit of small noise. 相似文献
74.
Xiao-Hua Yu Jing Zhao Shu-Cheng Zhang Jian-Hui Li Jun-Biao Zheng Zheng Li 《The aging male》2017,20(4):235-240
Objective: To analyze the impact of age, BMI and sex hormone on aging males’ symptoms (AMS) and the 5-item version of the international index of erectile function (IIEF-5) scores in middle-aged and elderly Chinese men.Methods: A population-based cross-sectional study was conducted in Jiashan County. A total of 969 men, aged between 40 and 80 years old, were admitted. Physical examination and the sex hormones were measured, and AMS and IIEF-5 scores were assessed.Results: The oneway ANOVA analysis indicated older age groups had higher AMS total-scores, somatic and sexual sub-scores, and lower IIEF5 scores (all p?.01). Pairwise correlation (rpairwise) analyses showed the significant associations between AMS and age or sex hormone (cFT, Bio-T, SHBG, and LH) levels, and similar for IIEF5. However, when age was adjusted, the correlation coefficients (rpartial) weakened, and correlation significance disappeared, except LH (for AMS: rpartial?=?0.096, p?=?.009; for IIEF-5: rpartial?= ?0.140, p?=?.001). Multiple linear regressions confirmed the influence of increased age and LH on the AMS and IIEF5 scores.Conclusion: CFT, Bio-T and SHBG failed to yield any additional predicting information when age was adjusted. To improve the male reproductive health, future research should pay more attention on aging-related comorbidities and how to improve general wellness. 相似文献
75.
Building a law-based government is a central element of the comprehensive framework for promoting the rule of law in China, while using evaluation to catalyze growth is in line with the incentive principle of management studies. Since China started to implement reform and opening up over thirty years ago, rule of law development and organizational evaluation have gone through several stages, each with different characteristics. Efforts to build a law-based government have met with success, but what the country now has is essentially still goal-oriented assessment. At present, this suffers from the lack of a clear goal orientation or definition of functions, an imperfect technical system and unsound motivation mechanisms, not to mention the practical problems of each government department going its own way, duplicating evaluations or being left rudderless. Drawing on a combination of value rationality and instrumental rationality and using government performance evaluation to promote the building of a law-based government not only conforms to the spirit of the rule of law and value rationality in government performance, but also strengthens the role of evaluation as an instrument for organizational management. Therefore, we need to create new evaluation theories, expand public participation, introducing diversified evaluating entities, improve technical systems, strengthen institutional buildup, and foster a performance-based culture. In addition, replacing goal-oriented assessment with performance evaluation will help the emergence of a new discipline—the performance evaluation of rule of law government, thus promoting multidisciplinary efforts to integrate and create new public administration theories in China. 相似文献
76.
本文运用归因理论,从培养学生英语学习的心理素质出发,激发其英语学习的动机,提高英语学习的积极性。 相似文献
77.
油气井场温度监控系统属于井场重要的安全保护装置,此系统用单片机+串行智能传感器来组成,广泛使用了串行芯片。介绍了系统硬件流程图,以及温度传感器芯片DS18B20的工作流程,详细说明了获取温度传感器序列号的ROM操作命令、存储器操作命令。 相似文献
78.
79.
Jin-Feng Wang Yi-Lan Liao Jiao-Jiao Wang Jie Fan Tian Chen Xiao-Lu Gao Zhi-Dong Cao Mao-Gui Hu Yong Ge Xiao-Ying Zheng 《Population and environment》2012,33(2-3):233-242
Natural catastrophes such as earthquakes can, in addition to causing loss of life, disrupt the urbanization process through the need for forced population redistribution and the modification of resource and environmental carrying capacity. The population carrying capacity (PCC) of an altered environment following an earthquake is a crucial determinant in the relocation of displaced persons. We use data adaptive methods to model the correlation between the physical environment and human population density in estimating PCC in areas affected by the 2008 Wenchuan earthquake. Comparing actual population distributions with ideal population distributions allows for the identification of villages where population exceeds PCC, or conversely, areas where the environment can support a higher population. Such a comparison can provide the basis for a relocation plan, a critical element of post-catastrophe policy-making. 相似文献
80.
随着城市化进程的不断推进、建设用地不断扩张,城市生态空间正处于剧烈变化中。大量具有生态价值和服务功能的土地不断被侵占,以满足暂时的城市建设需求。但从长远来看,这些生态用地的"消失",将不可避免的影响区域生态平衡,给区域经济的健康发展埋下隐患。广州作为华南的中心城市,改革开放以来,大量外来人口涌入,土地利用变化频繁,生态环境的保护面临着巨大压力。因此,本文基于多源遥感数据,利用监督分类法与综合指数法相综合的复合提取方案对2016年广州生态用地进行空间识别,掌握广州市生态用地存量现状。同时,借助生态风险小区和生态风险等景观指数对广州进行了生态风险评估,结果显示,广州市生态风险呈现明显的多核圈层结构,由多核心的中心向外部逐渐降低。 相似文献