全文获取类型
收费全文 | 826篇 |
免费 | 33篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 14篇 |
综合类 | 4篇 |
化学工业 | 164篇 |
金属工艺 | 7篇 |
机械仪表 | 10篇 |
建筑科学 | 60篇 |
能源动力 | 8篇 |
轻工业 | 112篇 |
水利工程 | 6篇 |
无线电 | 72篇 |
一般工业技术 | 132篇 |
冶金工业 | 110篇 |
原子能技术 | 14篇 |
自动化技术 | 151篇 |
出版年
2023年 | 3篇 |
2022年 | 9篇 |
2021年 | 28篇 |
2020年 | 15篇 |
2019年 | 16篇 |
2018年 | 15篇 |
2017年 | 12篇 |
2016年 | 14篇 |
2015年 | 19篇 |
2014年 | 28篇 |
2013年 | 44篇 |
2012年 | 37篇 |
2011年 | 46篇 |
2010年 | 28篇 |
2009年 | 38篇 |
2008年 | 45篇 |
2007年 | 36篇 |
2006年 | 23篇 |
2005年 | 36篇 |
2004年 | 25篇 |
2003年 | 18篇 |
2002年 | 23篇 |
2001年 | 21篇 |
2000年 | 18篇 |
1999年 | 13篇 |
1998年 | 35篇 |
1997年 | 30篇 |
1996年 | 25篇 |
1995年 | 9篇 |
1994年 | 8篇 |
1993年 | 16篇 |
1992年 | 8篇 |
1991年 | 8篇 |
1990年 | 12篇 |
1989年 | 15篇 |
1988年 | 3篇 |
1987年 | 14篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 8篇 |
1983年 | 5篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1966年 | 3篇 |
1963年 | 1篇 |
排序方式: 共有864条查询结果,搜索用时 15 毫秒
1.
Xiaoming Zhou Martin Jacobsson Henk Uijterwaal Piet Van Mieghem 《International Journal of Communication Systems》2008,21(6):643-663
Although packet delay and loss are two important parameters of the Internet performance, to the best of our knowledge, the evolution of large‐scale IPv6 delay and loss performance has previously not been studied. In this paper, we analyze more than 600 end‐to‐end IPv6 paths between about 26 testboxes of RIPE Network Coordination Centre over two years, and compare the delay and loss performance over time with their IPv4 counterparts. We present and discuss the measurement methodologies and show that IPv6 paths have a higher delay and loss than their IPv4 counterparts. The main reason for the worse performance stems from IPv6‐in‐IPv4 tunnels rather than from native IPv6 paths and such tunnels are still widely used today. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
2.
Henk A. van der Schee Willy B. H. Kennedy Jan-Paul Bouwknegt Renske Hittenhausen-Gelderblom 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1989,188(1):11-15
Summary Linear discriminant analysis of GLC-aromagram data is used to separate several classes of wine distillates, namely cognac, armagnac and brandy. In this paper we demonstrate how this method was used to detect adulteration. The adulteration was confirmed by the presence of ethyl heptanoate and limonene, which are well-known flavour compounds. They were analysed by means of a Purge and Trap headspace technique. Mass spectrometry was used to identify these flavours.
Ein Beispiel für die Verfälschung von Cognac
Zusammenfassung Die Linear-Discriminanz-Analyse von GLC-Aromagramm-Daten wird zur Klassifizierung von Weindestillaten wie Cognac, Armagnac und Brandy verwendet. In dieser Arbeit werden mit dieser Methode Verfälschungen nachgewiesen, die durch die Gegenwart der Ethylester der Heptansäure und des Limonen belegt werden konnten. Diese Substanzen wurden mit der Purge- und Trap-Methode erfaßt und massenspektrometrisch identifiziert.相似文献
3.
CB Henk S Grampp P Wiesbauer A Zoubek F Kainberger M Breitenseher GH Mostbeck H Imhof 《Canadian Metallurgical Quarterly》1998,38(6):509-522
Ewing's sarcoma is a highly malignant neoplasm of the bone whose origin is still uncertain. A strong relationship exists between Ewing's sarcoma and tumors of neural origin (Ewing family of tumors). Ewing's sarcoma must be distinguished from other round-cell tumors like lymphoma and neuroblastoma and also must be differentiated from osteogenic sarcomas. On plain radiographs, Ewing's sarcoma appears as a lytic or mixed lytic-sclerotic, rarely as predominantly sclerotic lesion with margins Lodwick grade III. It is located primarily in the diaphyseal and metadiaphyseal regions of the long bones of the lower extremities. A large soft tissue tumor is usually present. Magnetic resonance imaging is the imaging modality of choice to evaluate the extent of the primary lesion, to monitor the response to neoadjuvant chemotherapy and to follow up non-resected Ewing's sarcomas. Bone scintigraphy is necessary to detect skeletal metastasis, and 201thallium scanning has been shown to be sensitive in the monitoring of treatment response. Today, computed tomography is not longer used to image the tumor site; however, spiral CT of the lungs plays a central role as a staging and follow-up tool. 相似文献
4.
On the basis of the idea that situational norms are mentally represented as associations between environments and normative behavior, it was proposed that an environment can automatically direct normative behavior. More specifically, when situational norms are well-established (e.g., when entering the library, one should be silent), an environment is capable of automatically activating mental representations of normative behavior and the behavior itself. In these experiments, participants were exposed to pictures of environments, and effects on accessibility of representations of normative behavior and on actual behavior were assessed. Results indicated that representations of behavior and actual behavior itself are activated automatically when (a) goals to visit the environment are active and (b) strong associations between environment and normative behavior are established. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
5.
6.
This study examined the effect of active pre-warming on speed and quality of performance during simulated firefighting exercise. Twelve male firefighters performed two trials in counterbalanced order. They were either pre-warmed by 20-min cycling at 1.5 Watt kg−1 body mass (WARM) or remained thermoneutral (CON) prior to a simulated firefighting activity. After the pre-warming, gastrointestinal temperature (P < 0.001), skin temperature (P = 0.002), and heart rate (P < 0.001) were higher in WARM than in CON. During the firefighting activity, rating of perceived exertion, thermal sensation and discomfort were higher for WARM than for CON. Finish time of the firefighting activity was similar, but the last task of the activity was completed slower in WARM than in CON (P = 0.04). In WARM, self-reported performance quality was lower than in CON (P = 0.04). It is concluded that pre-warming reduces the speed during the last part of simulated firefighting activity and reduces self-reported quality of performance. 相似文献
7.
The phosphorous content of fish oil was determined by acid hydrolysis for 168 h (one week) in 2 M hydrochloric acid at 120°C in glass tubes, followed by filtration and molybdenum blue colour development in an aliquot of the filtrate. The method is regarded as a convenient routine laboratory procedure, and the results obtained by the method are in good agreement with those obtained with the ashing procedure of the American Oil Chemists' Society. The determination has been satisfactorily applied to the analysis of many South African fish oils. 相似文献
8.
Renaud Merlet Louis Winnubst Arian Nijmeijer Mohammad Amirilargani Ernst J. R. Sudhölter Louis C. P. M. de Smet Sara Salvador Cob Pieter Vandezande Matthieu Dorbec Soraya Sluijter Henk van Veen Yvonne VanDelft Ingrid Wienk Petrus Cuperus Subhalaxmi Behera Yusak Hartanto Ivo F. J. Vankelecom Patrick de Wit 《化学,工程师,技术》2021,93(9):1389-1395
Organic solvent nanofiltration (OSN) is gradually expanding from academic research to industrial implementation. The need for membranes with low and sharp molecular weight cutoffs that are able to operate under aggressive OSN conditions is increasing. However, the lack of comparable and uniform performance data frustrates the screening and membrane selection for processes. Here, a collaboration is presented between several academic and industrial partners analyzing the separation performance of 10 different membranes using three model process mixtures. Membrane materials range from classic polymeric and thin film composites (TFCs) to hybrid ceramic types. The model solutions were chosen to mimic cases relevant to today's industrial use: relatively low molar mass solutes (330–550 Da) in n-heptane, toluene, and anisole. 相似文献
9.
10.