全文获取类型
收费全文 | 22327篇 |
免费 | 413篇 |
国内免费 | 1篇 |
专业分类
管理学 | 3265篇 |
民族学 | 82篇 |
人才学 | 2篇 |
人口学 | 2076篇 |
丛书文集 | 101篇 |
教育普及 | 3篇 |
理论方法论 | 2166篇 |
现状及发展 | 1篇 |
综合类 | 295篇 |
社会学 | 10691篇 |
统计学 | 4059篇 |
出版年
2023年 | 101篇 |
2021年 | 127篇 |
2020年 | 314篇 |
2019年 | 450篇 |
2018年 | 512篇 |
2017年 | 701篇 |
2016年 | 582篇 |
2015年 | 420篇 |
2014年 | 543篇 |
2013年 | 3409篇 |
2012年 | 760篇 |
2011年 | 709篇 |
2010年 | 535篇 |
2009年 | 461篇 |
2008年 | 551篇 |
2007年 | 566篇 |
2006年 | 542篇 |
2005年 | 545篇 |
2004年 | 497篇 |
2003年 | 460篇 |
2002年 | 514篇 |
2001年 | 596篇 |
2000年 | 599篇 |
1999年 | 516篇 |
1998年 | 383篇 |
1997年 | 373篇 |
1996年 | 373篇 |
1995年 | 340篇 |
1994年 | 325篇 |
1993年 | 336篇 |
1992年 | 365篇 |
1991年 | 349篇 |
1990年 | 322篇 |
1989年 | 326篇 |
1988年 | 318篇 |
1987年 | 279篇 |
1986年 | 265篇 |
1985年 | 312篇 |
1984年 | 299篇 |
1983年 | 269篇 |
1982年 | 244篇 |
1981年 | 208篇 |
1980年 | 188篇 |
1979年 | 225篇 |
1978年 | 192篇 |
1977年 | 169篇 |
1976年 | 161篇 |
1975年 | 170篇 |
1974年 | 136篇 |
1973年 | 130篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
The placement of nasogastric (NG) tubes is known to be prone to error and may lead to serious issues for patient safety and wellbeing. In some instances these have been catastrophic and resulted in the death of the patient. This study sought to explore the potential risks associated with this procedure through the use of systematic prospective risk assessment. The research team used the Prospective Hazard Analysis (PHA) toolkit developed by Ward et al (2010) . The study has shown a wide number of risks that cover equipment design, work organisation, and training issues. The link between equipment design and training provides an important example of the need for a systematic approach to reducing errors and improving resilience in this aspect of healthcare. 相似文献
993.
Based on a system-theoretic discussion of sustainability, this paper aims to develop a conceptual model of a sustainable work system which is consistent with the definition of ergonomics by the IEA in 2000 (but also with earlier definitions) as well as with the triple bottom line understanding of sustainable development - comprising the management of human, social, ecological and economic capital in a balanced manner. 相似文献
994.
In this study we examine whether the Work Ability Index (WAI) has additional value in predicting long-term absenteeism in construction industry. Results of the study show that the WAI has additional value in predicting absenteeism, but that the amount of explained variance is low. This is partly due to the definition of absenteeism in The Netherlands, where this study took place. 相似文献
995.
996.
Buckle P 《Work (Reading, Mass.)》2012,41(Z1):3847-3849
Systems approaches and their relevance to risk assessment are considered through an examination of a number of recent applications in England. The importance of visual mapping of systems is emphasised. This approach encourages participation from those within the system with less technical knowledge but with important information to add to a risk assessment. Other advantages outlined include the ability to readily identify system boundaries, map processes and record both strengths and weaknesses of existing or planned system changes. The use of risk assessment methods with this approach should be cautious, as any one method may only identify a sub-set of all risks. 相似文献
997.
Van Deun D Verhaert V Willemen T Wuyts J Verbraecken J Exadaktylos V Haex B Vander Sloten J 《Work (Reading, Mass.)》2012,41(Z1):1274-1280
Proper body support plays an import role in the recuperation of our body during sleep. Therefore, this study uses an automatically adapting bedding system that optimises spinal alignment throughout the night by altering the stiffness of eight comfort zones. The aim is to investigate the influence of such a dynamic sleep environment on objective and subjective sleep parameters. The bedding system contains 165 sensors that measure mattress indentation. It also includes eight actuators that control the comfort zones. Based on the measured mattress indentation, body movements and posture changes are detected. Control of spinal alignment is established by fitting personalized human models in the measured indentation. A total of 11 normal sleepers participated in this study. Sleep experiments were performed in a sleep laboratory where subjects slept three nights: a first night for adaptation, a reference night and an active support night (in counterbalanced order). Polysomnographic measurements were recorded during the nights, combined with questionnaires aiming at assessing subjective information. Subjective information on sleep quality, daytime quality and perceived number of awakenings shows significant improvements during the active support (ACS) night. Objective results showed a trend towards increased slow wave sleep. On the other hand, it was noticed that % N1-sleep was significantly increased during ACS night, while % N2-sleep was significantly decreased. No prolonged N1 periods were found during or immediately after steering. 相似文献
998.
In the future the air traffic will rise--the workload of the controllers will do the same. In the BMWi research project, one of the tasks is, how to ensure safe air traffic, and a reasonable workload for the air traffic controllers. In this project it was the goal to find ways how to reduce the workload (and stress) for the controllers to allow safe air traffic, esp. at huge hub-airports by implementing augmented reality visualization and interaction. 相似文献
999.
This work is based on the study of pioneering sustainable product development initiatives, and the analysis was guided by the cradle-to-cradle concept, which sees the waste of a given process as raw material for another, just like it happens in nature. Several studies on human factors have focused on factory conditions and workers dealing with product assembly. This research, however, relates more to consumer behavior, product use and end-of-life. The purchase of more environmentally- friendly products, in particular, is heavily influenced by the information made available by the companies. In this scenario, this article discusses three early but notable efforts on green product development, focusing on the disclosure practices adopted by the companies regarding the composition of their products. Research and data collection has focused on the footwear industry, whose products satisfy a basic human need and are ubiquitous worldwide. The use of hazardous materials and chemicals in shoe manufacturing, particularly the use of chromium - a highly toxic element - in addition to toxic solvents and adhesives and non-recyclable synthetic materials can pose serious risks to human health and the environment, even though the consumer usually is not aware of all the relevant characteristics of this kind of product. 相似文献
1000.
The noise caused by the movement of users on their chairs in the work environment may indicate structural weaknesses and risk, and still significantly reduce productivity by increasing employees stress level. By understanding the activities to be developed in a work place one may understand what should be necessary to a good development, thereafter a search for improvement of labor activity with the aim of better use of resources in the operation of product use may be done. The analysis of the incremental variation of noise in professional chairs aims to identify its origin and the time the emission of noise starts during the period of use, its development and the major causative agents. Determining the characteristics of the sound of different materials and adjustments mechanisms of the chair can determine how different materials interact with each other. The measurement of these noises in an acoustic isolated room using directional microphones, if recorded and analyzed properly makes it possible to investigate and orientate to suspect elements in order to propose solutions and identify the quality of other similar chairs. Based on the results recommendations can be established for the orientation of users, managers and people responsible for the acquisition of the products, inducing them to review the employment of materials and the choice of the processes of production. These aspects are not covered in the Brazilian ergonomics norms and standards in the use of chairs. 相似文献