全文获取类型
收费全文 | 1871篇 |
免费 | 21篇 |
国内免费 | 19篇 |
专业分类
化学 | 309篇 |
力学 | 27篇 |
综合类 | 6篇 |
数学 | 17篇 |
物理学 | 97篇 |
综合类 | 1455篇 |
出版年
2024年 | 2篇 |
2023年 | 11篇 |
2022年 | 33篇 |
2021年 | 34篇 |
2020年 | 52篇 |
2019年 | 44篇 |
2018年 | 42篇 |
2017年 | 42篇 |
2016年 | 56篇 |
2015年 | 29篇 |
2014年 | 148篇 |
2013年 | 128篇 |
2012年 | 165篇 |
2011年 | 168篇 |
2010年 | 127篇 |
2009年 | 150篇 |
2008年 | 105篇 |
2007年 | 91篇 |
2006年 | 107篇 |
2005年 | 61篇 |
2004年 | 71篇 |
2003年 | 46篇 |
2002年 | 35篇 |
2001年 | 35篇 |
2000年 | 27篇 |
1999年 | 24篇 |
1998年 | 19篇 |
1997年 | 12篇 |
1996年 | 12篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 9篇 |
1982年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有1911条查询结果,搜索用时 15 毫秒
11.
高等学校实验室及实验教学改革模式探讨 总被引:3,自引:0,他引:3
彭辉 《长春师范学院学报》2006,25(3):120-121
本文分析了目前高校实验室建设中存在的主要问题,对高校实验教学和实验室管理模式的改革方式进行了探讨. 相似文献
12.
刘慧诚 《太原师范学院学报(自然科学版)》2006,5(3):133-135
安装前的准备工作和竣工后的验收工作是影响语言实验室正常运行的两个重要因素.文章针对上述两点进行阐述. 相似文献
13.
通过对技术发展过程的分析,揭示了技术组织形式必然要进化的原因。介绍了技术组织的历史发展过程,指出随着生产的发展、技术的进步,技术组织会不断地进化。 相似文献
14.
杨杏本 《湖北师范学院学报(自然科学版)》2006,26(2):99-102
教育技术学专业实验室的建设,要根据教育技术学专业的学科特点和培养目标,结合学校的实际情况,科学规划,系统设计,规范布局,合理配置,走数字化、网络化道路,才能充分发挥实验室的效益,才能最大限度的提高学生信息技术素养。文章按照这个思路进行了教育技术学专业远距离实验室的建设的功能需求、可行性分析。 相似文献
15.
This paper is aimed at investigating the effect of the initial water content in a vertisol sample on the whole wetting-drying
process leading the system to a change in volume. In order to do this, an experimental setup was realized and employed with
very thin soil layers wetted from below (“per ascensum”). The results show that the effect of the initial water content on
the swelling-shrinkage process is to shift the corresponding curve e-ϑ towards bigger-smaller values of the humidity but does not seem to affect the dynamics of the process.
The text was submitted by the authors in English. 相似文献
16.
Joris Van Loco Maureen Moerenhout Hedwig Beernaert 《Accreditation and quality assurance》2003,8(2):61-67
A GLP study can be performed at more than one site. This is called a multi-site study. Although, the study is performed at
different sites, it is still one study and must completely comply with the GLP principles. The fact that different activities
are conducted at different sites implies that the planning, the organization and the communication are crucial for the success
of the study. This means that all the staff involved should know their responsibilities and should have the knowledge and
skills to realize all the phases of the study according to the GLP principles. To achieve a well managed multi-site study,
several strategies for setting up such a study can be followed. This paper focuses on the responsibilities, communication,
and collaboration of the personnel, which are involved in a multi-site study. Several case studies are highlighted, and we
concluded that the basic communication triangle in a single-site GLP study between test facility management, study director,
and the quality assurance unit should be extended to the communication among test facility and test site management, study
director, principle investigator(s), and the quality assurance units at the test sites.
Introduction
Received: 14 August 2002 Accepted: 26 November 2002 相似文献
17.
光谱实验室的建设和管理 总被引:1,自引:0,他引:1
阐述冶金、铸造等行业用于金属成分分析的直读发射光谱仪实验室的建设和管理。从仪器的调研、选型,实验室选址,基础设施设备的准备,仪器的安装、调试、验收、日常分析,实验室管理等几个方面,分别作了介绍。 相似文献
18.
In our former investigations, the phenomenon high temperature corrosion (HTC) was described exemplarily on selected materialcoating combinations for blades of stationary gas turbines, mainly in the temperature region of up to 750° C. To answer the question, in which manner higher gas inlet and/or higher material surface temperature would influence the HTC behaviour, a special analytical technique—the integral layer profile analysis—was introduced to ameliorate concentration profile methods. By examining IN 738 LC specimens with CoCrAlY plasma spray coating, stressed by hot gas at 900° C, the limits of this system are shown by explaining the corrosion mechanism; the method is also used for other systems, e.g. U 520 with NiCrAlY coating at 750° C. 相似文献
19.
D. Joe Boone 《Accreditation and quality assurance》2004,10(1-2):5-9
A recent US Institute of Medicine report indicated that up to 98,000 deaths and more than 1 million injuries occur each year in the United States due to medical errors. These include diagnostic errors, such as an error or delay in diagnosis, failure to employ indicated tests and the use of outmoded tests. Laboratory tests provide up to 80% of the information used by physicians to make important medical decisions, therefore it is important to determine how often laboratory testing mistakes occur, whether they cause patient harm, where they are most likely to occur in the testing process, and how to prevent them from occurring. A review of the literature and a US Quality Institute Conference in 2003 indicates that errors in laboratory medicine occur most often in the pre-analytical and post-analytical steps in the testing process, but most of the quality improvement efforts focus on improving the analytical process. Measures must be developed and employed to reduce the potential for mistakes in laboratory medicine, including better indicators for the quality of laboratory service. Users of laboratory services must be linked with the laboratorys information system to assist them with decisions about test ordering, patient preparation, and test interpretation. Quality assessment efforts need to be expanded beyond external quality assessment programs to encompass the detection of non-analytical mistakes and improving communication between the users of and providers of laboratory services. The actual number of mistakes in laboratory testing is not fully recognized, because no widespread process is in place to either determine how often mistakes occur or to systematically eliminate sources of error. We also tend to focus on mistakes that result in adverse events, not the near misses that cause no observable harm. The users of laboratory services must become aware of where testing mistakes can occur and actively participate in designing processes to prevent mistakes. Most importantly, healthcare institutions need to adopt a culture of safety, which is implemented at all levels of the organization. This includes establishing closer links between providers of laboratory services and others in the healthcare delivery system. This was the theme of a 2003 Quality Institute Conference aimed at making the laboratory a key partner in patient safety. Plans to create a permanent public–private partnership, called the Institute for Quality in Laboratory Medicine, whose mission is to promote improvements in the use of laboratory tests and laboratory services are underway.Presented at the 9th Conference on Quality in the Spotlight, 18–19 March 2004, Antwerp, Belgium. 相似文献
20.
On September 1, 1992 all testing sites in the United States were required to comply with the Clinical Laboratory Improvement
Amendments of 1988 (CLIA'88). These regulations, based on both total quality management (TQM) and continuous quality improvement
(CQI) principles, reshaped the environment for more than 90% of laboratories. CLIA'88 represented a revolutionary change by
imposing universal, uniform regulations based on test complexity for all sites examining materials derived from the human
body for the purpose of providing information for the diagnosis, prevention, or treatment of disease. CLIA'88 specifies minimum
requirements for personnel, quality control, and proficiency testing (PT). In addition, laboratories are required to follow
manufacturers' directions and comply with other specified good laboratory practices. PT is mandated for most of the frequently
run analyses and quality assurance requirements integrate the principles of CQI as well as TQM into the regulatory process.
Biannual inspection is integral to CLIA'88, however, laboratories can choose other federally approved ("deemed") professional
organizations, such as the Commission on Office Laboratory Accreditation, the College of American Pathologists, or the Joint
Commission on Accreditation of Healthcare Organization, having standards that meet or exceed those of CLIA'88. CLIA'88 has
still not been finalized. This article discusses the impact and changes since CLIA's implementation in 1992.
Received: 5 October 1998 · Accepted: 20 October 1998 相似文献