全文获取类型
收费全文 | 149篇 |
免费 | 5篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 10篇 |
机械仪表 | 16篇 |
建筑科学 | 8篇 |
矿业工程 | 1篇 |
轻工业 | 4篇 |
无线电 | 25篇 |
一般工业技术 | 17篇 |
冶金工业 | 62篇 |
自动化技术 | 10篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 5篇 |
2017年 | 3篇 |
2016年 | 6篇 |
2014年 | 2篇 |
2013年 | 6篇 |
2012年 | 6篇 |
2011年 | 8篇 |
2010年 | 4篇 |
2009年 | 2篇 |
2008年 | 5篇 |
2007年 | 3篇 |
2006年 | 2篇 |
2005年 | 4篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 5篇 |
1999年 | 4篇 |
1998年 | 12篇 |
1997年 | 11篇 |
1996年 | 6篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有154条查询结果,搜索用时 10 毫秒
61.
F. R. Hindriks A. Bosman P. F. Rademaker 《Journal of Automated Methods and Management in Chemistry》1989,11(4):174-178
The significance of indirect costs in the cost price calculation of
clinical chemistry laboratory tests by way of the production centres
method has been investigated. A cost structure model based on the ‘production centres’ method, the Academisch Ziekenhuis Groningen
(AZG) 1-2-3 model, is used for the calculation of cost and cost
prices as an add-in tool to the spreadsheet program Lotus 1-2-3.
The system specifications of the AZG 1-2-3 cost structure model
have been extended with facilities to impute all relevant indirect
costs to cost centres by aid of allocation rules, which can be chosen
freely. The inference is made that as indirect costs play a more
important part in decision-making processes concerning planning
and control, the specification of the relation to the cost centres
should be determined in a more detailed way. The AZG 1-2-3 cost
structure model has therefore been extended in order to increase the
significance as a management tool for laboratory management. 相似文献
62.
A van der Bilt FA Ottenhoff HW van der Glas F Bosman JH Abbink 《Canadian Metallurgical Quarterly》1997,76(4):839-847
Enzymatically formed peptides show positional variations as well as highly conserved amino acids. In the cases of gramicidin S, tyrocidine, linear gramicidins, enniatins, echinocandins and viridogrisein in vivo and in vitro studies indicate substrate selection at the level of amino acid activation as a major control step. Evidence for proof-reading steps beyond activation has been obtained in penicillin and cyclosporin biosynthesis. Activated substrate analogues may promote the formation of side products such as dipeptides and cyclodipeptides. Modifications of intermediates, such as N-methylation, influence the rates of peptide synthesis. These control steps pose limitations for the application of such enzyme systems in the production of peptide libraries. They may originate from a target oriented evolution of these synthetases. 相似文献
63.
64.
Fan-Chi Hou Bosman G. Simoen E. Vanhellemont J. Claeys C. 《Electron Devices, IEEE Transactions on》1998,45(12):2528-2536
The low-frequency 1/f-like noise of gated n+-p silicon diodes has been measured and analyzed in terms of trapping and detrapping of holes in defect centers located in the bulk section of the space charge region at 0.43 eV below the conduction band. Both the trap characteristics and their precise physical location are resolved from the noise measurements showing that the noise producing defect region moves closer to the metallurgical junction when forward bias is increased. The noise measurements independently confirm that thermal substrate pretreatments lower the defect density in the diodes fabricated in Czochralski (CZ) grown substrates. The defect centers are assumed to be associated with precipitated oxygen/dislocation complexes 相似文献
65.
It is shown that while the gate-voltage-dependent mobility in MOSFETs has a very large effect upon the (Ids, Vg) characteristic,, it has only a relatively small effect on the thermal noise parameter αsat = Rngmax. 相似文献
66.
Bagian JP Gosbee J Lee CZ Williams L McKnight SD Mannos DM 《The Joint Commission journal on quality improvement》2002,28(10):531-545
BACKGROUND: The patient safety program in the Department of Veterans Affairs (VA) began in 1998, when the National Center for Patient Safety (NCPS) was established to lead the effort on a day-to-day basis. NCPS provides the structure, training, and tools, and VA facilities provide front-line expertise, feedback about the process, and root cause analysis (RCA) of adverse events and close calls. MONITORING THE PROCESS: Facility patient safety managers determine the disposition of adverse events and close calls occurring at their facilities. They use a safety assessment code (SAC) to prioritize the actual and potential severity and frequency of an event. BEFORE-AND-AFTER STUDY: Before the new RCA system was implemented in 2000, the VA used another adverse event reporting system, focused review (FR). A comparison of the two processes indicates that the RCA process has shifted analyses of adverse events toward a human factors engineering approach-entailing a search for system vulnerabilities rather than human errors and other less actionable root causes. CASE EXAMPLES: Two case examples--on hazards in the magnetic resonance imaging (MRI) room and on a cardiac pacemaker malfunction--illustrate how the RCA system works in actual operation. The cases illustrate that broadly applicable, high-impact actions can result from a thorough RCA process. DISCUSSION: NCPS monitors the quality and completeness of RCAs through the immediate review and feedback process. Still to be investigated is the effectiveness of RCA actions addressing the hypothesized root causes and contributing factors of the close calls and adverse events. 相似文献
67.
The operational life of bearings is often determined by the performance of the lubricating grease. The consistency of the grease prevents it from leaking out of the bearing and provides good sealing properties. The possible ingress of water into the bearing will have a considerable impact not only on this consistency but also on the lubricating ability of the grease. There are numerous applications where water ingress may occur, such as in the steel, food, pulp, and paper industries. Some greases are less sensitive to water than others. No specific guidelines are available to select the proper grease for bearings subjected to water ingress. The goal of the article is to contribute to the development of such guidelines for greases subjected to water ingress by studying the impact of water on grease rheology. Fully formulated, commercially available greases with the most common thickeners and base oils are used as model greases. It will be shown that water strongly influences rheological properties such as zero-shear viscosity, yield stress, and storage modulus. Calcium sulfonate greases were found to become stiffer after absorbing a considerable amount of water, leading to an increase in zero-shear viscosity and yield stress. However, lithium, lithium complex, and polyurea greases were found to soften, with appreciable changes in measured rheological properties. 相似文献
68.
Sarah Clarke Gurthwin Bosman Wessel du Toit Jose Luis Aleixandre-Tudo 《Journal of the science of food and agriculture》2023,103(1):7-25
White wine phenolic analyses are less common in the literature than analyses of red wine phenolics. Analytical techniques for white wine phenolic analyses using spectrophotometric, chromatographic, spectroscopic, and electrochemical methods are reported. The interest of research in this area combined with the advances in technology aimed at the winemaking industry are promoting the establishment of novel approaches for identifying, quantifying, and classifying phenolic compounds in white wine. This review article provides an overview of the current research into white wine phenolics through a critical discussion of the analytical methods employed. © 2022 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. 相似文献
69.
S Caplin JP Cerottini FT Bosman MT Constanda JC Givel 《Canadian Metallurgical Quarterly》1998,83(4):666-672
Pulse sequences based on FID signals and projection reconstruction (PR) were investigated for lung MRI at 0.5 T and evaluated for artifacts caused by: (1) k-space mismapping due to either delay or distortion of the readout gradient waveform, (2) cardiac motion and pulsatile flow, and (3) respiratory motion. Nonstructured artifacts were described, simulated, and experimentally confirmed for the first time. Nonstructured artifacts did not impair the demonstration of structures of high signal-to-noise ratio (SNR) but generated quantitative errors in the image intensity analysis over the lung parenchyma. The use of FID-based PR techniques for lung MRI is not justified at 0.5 T. 相似文献
70.
A de Wijer MH Steenks JR de Leeuw F Bosman PJ Helders 《Canadian Metallurgical Quarterly》1996,23(11):742-750
This study was performed to assess the prevalence of signs and symptoms related to cervical spine disorders (CSD) in subgroups of patients with temporomandibular disorders (TMD) and to compare TMD patients and CSD patients with regard to the results of orthopaedic cervical spine tests. One hundred and eleven consecutive patients with TMD and 103 consecutive patients with signs and symptoms of CSD were examined. The results indicated that there is a considerable overlap in the signs and symptoms of patients with TMD and patients with CSD. Signs and symptoms on neck extension occurred more often in CSD patients than in subgroups of TMD patients. No significant differences in upper cervical extension, neck flexion, and shoulder girdle function were found between CSD patients and subgroups of patients with TMD. Patients with CSD reported neck pain during active and passive movements of the neck more often than the subgroups of patients with TMD. TMD patients and CSD patients did not differ with regard to pain on shoulder girdle function and palpation of the shoulder girdle. Logistic regression analyses showed that orthopaedic tests of the cervical spine are of minor importance in discriminating between patients with TMD and patients with CSD. It is concluded that TMD with a myogenous involvement in contrast to TMD with only an arthrogenous involvement should no longer be viewed as a local disorder of the stomatognathic system. The upper quarter, including the stomatognathic system, cervical spine, and shoulder girdle, should be evaluated in patients with more complex or persistent symptoms in the head and neck region. 相似文献