全文获取类型
收费全文 | 1379篇 |
免费 | 90篇 |
专业分类
电工技术 | 10篇 |
综合类 | 1篇 |
化学工业 | 472篇 |
金属工艺 | 30篇 |
机械仪表 | 20篇 |
建筑科学 | 96篇 |
矿业工程 | 4篇 |
能源动力 | 33篇 |
轻工业 | 240篇 |
水利工程 | 14篇 |
石油天然气 | 11篇 |
无线电 | 68篇 |
一般工业技术 | 192篇 |
冶金工业 | 131篇 |
原子能技术 | 9篇 |
自动化技术 | 138篇 |
出版年
2024年 | 10篇 |
2023年 | 19篇 |
2022年 | 72篇 |
2021年 | 91篇 |
2020年 | 45篇 |
2019年 | 48篇 |
2018年 | 34篇 |
2017年 | 55篇 |
2016年 | 53篇 |
2015年 | 36篇 |
2014年 | 45篇 |
2013年 | 95篇 |
2012年 | 79篇 |
2011年 | 95篇 |
2010年 | 77篇 |
2009年 | 68篇 |
2008年 | 60篇 |
2007年 | 43篇 |
2006年 | 28篇 |
2005年 | 37篇 |
2004年 | 26篇 |
2003年 | 26篇 |
2002年 | 21篇 |
2001年 | 22篇 |
2000年 | 21篇 |
1999年 | 18篇 |
1998年 | 37篇 |
1997年 | 24篇 |
1996年 | 32篇 |
1995年 | 13篇 |
1994年 | 16篇 |
1993年 | 13篇 |
1992年 | 8篇 |
1991年 | 5篇 |
1990年 | 9篇 |
1989年 | 8篇 |
1988年 | 10篇 |
1986年 | 9篇 |
1985年 | 7篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1977年 | 3篇 |
1976年 | 12篇 |
1975年 | 2篇 |
1968年 | 2篇 |
1963年 | 2篇 |
排序方式: 共有1469条查询结果,搜索用时 16 毫秒
81.
Cooking and texture properties of gluten‐free fettuccine processed from defatted flaxseed flour and rice flour
下载免费PDF全文
![点击此处可从《International Journal of Food Science & Technology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Camila M. A. de Moura Manoel S. Soares Júnior Fernanda A. Fiorda Márcio Caliari Rosângela Vera Maria V. E. Grossmann 《International Journal of Food Science & Technology》2016,51(6):1495-1501
Nonconventional raw materials have been applied in gluten‐free pasta, to meet the demand of people with coeliac disease. The objective of this study was to evaluate the cooking properties and texture of pasta formulated with rice flour, defatted flaxseed flour and pregelatinised mixed flour of rice and flaxseed (80:20). For this experiment, simplex design was used. Cooking properties and texture were found within the quality limits established for this type of product. The pasta with the most desirable properties (short optimum cooking time (OCT), less solid loss (SL) and intermediate mass increase (MI)) was that one formulated with 43 g 100 g?1 of pregelatinised flour, 47 g 100 g?1 of rice flour and 10 g 100 g?1 of defatted flaxseed flour. This formulation can be characterised as a food rich in dietary fibre and of high nutritional value. 相似文献
82.
Sustainable recovery of grape skins for use in an apple beverage with antiglycation properties
下载免费PDF全文
![点击此处可从《International Journal of Food Science & Technology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Vera Lavelli Pedapati S.C. Sri Harsha Maria Piochi Luisa Torri 《International Journal of Food Science & Technology》2017,52(1):108-117
An apple puree formulated with red grape skins was developed on pilot scale as a new beverage with antiglycation properties. The addition level of grape skins was selected by a liking test with 70 consumers. The selected formulation was a fibre‐rich source and delivered grape anthocyanins, flavonols and flavanols resulting in ~ twofold higher antiglycation activity than the apple puree. Pasteurisation (3‐D in the target microorganism Alicyclobacillus acidoterrestris) did not affect the antiglycation activity, which decreased by 30% upon sterilisation. Storage for 1 month in the temperature range 15–35 °C affected the contents of anthocyanins, monomeric, dimeric and oligomeric flavanols, while chlorogenic acid, flavonols and dihydrochalcones were stable. About 90% antiglycation activity was retained after one‐month storage at 15 °C. The use of red grape skin as ingredient could represent an opportunity for the apple processing industry to develop a value‐added product. 相似文献
83.
Sustainability metrics for eco-technologies assessment, Part II. Life cycle analysis 总被引:1,自引:1,他引:0
Juliana Garcia Moretz-Sohn Monteiro Ofélia de Queiroz Fernandes Araújo José Luiz de Medeiros 《Clean Technologies and Environmental Policy》2009,11(4):459-472
This work presents a sustainability analysis of CO2 reuse to produce dimethyl carbonate (DMC) via ethylene oxide (ROUTE A) and via urea methanolysis (ROUTE B). Two different
technologies are considered in ROUTE A: reaction followed by separation and reactive distillation. Life cycle analyses of
the ROUTES are presented employing sustainability analysis performed in HYSYS process simulator, along with WAR Algorithm.
Process economical optimization is performed to maximize the processes profitability. A sustainability function, defined as
a 2D indicator involving both economical and environmental aspects, is calculated for the optimized processes. Additional
sustainability indexes are evaluated: material index, energy index, and ecoefficiency. The results, under both economical
and environmental aspects, show that ROUTE A is the most sustainable. The study also points to the relevance of the frontier
set between the domains cradle-to-gate and gate-to-gate in assessing process sustainability during LCA. 相似文献
84.
Khoruzhaya Vera G. Martsenyuk Petr S. Meleshevich Konstantin A. Velikanova Tamara Ya. 《Powder Metallurgy and Metal Ceramics》2002,41(5-6):278-283
The reaction of components of the Si — Al — O — N — Ti system in its elements Si 3N4 — AlN, TiN — AlN, and Al 2O 3 — AlN was investigated by differential thermal and x-ray diffraction analysis. It was established that upon hot pressing mixtures of Si3N 4 and AlN (up to 1950°C) free silicon is formed by the decomposition of Si 3N4, which reacts with oxygen present as an impurity to form SiO. When TiN reacts with AlN a phase with the spinel structure (Al23O 27N 5), which can form only in the presence of excess oxygen, appears in addition to the initial components. Spinel is also produced by the reaction of Al 2O3 with AlN. In this case a eutectic between Al 23O27N5 and Al2O3 is observed. 相似文献
85.
Soft errors are an important challenge in contemporary microprocessors. Particle hits on the components of a processor are expected to create an increasing number of transient errors with each new microprocessor generation. In this paper we propose simple mechanisms that effectively reduce the vulnerability to soft errors In a processor. Our designs are generally motivated by the fact that many of the produced and consumed values in the processors are narrow and their upper order bits are meaningless. Soft errors canted by any particle strike to these higher order bits can be avoided by simply identifying these narrow values. Alternatively soft errors can be detected or corrected on the narrow values by replicating the vulnerable portion of the value inside the storage space provided for the upper order bits of these operands. We offer a variety of schemes that make use of narrow values and analyze their efficiency in reducing soft error vulnerability of level-1 data cache of the processor 相似文献
86.
Interactive distance learning (IDL) is an evolving paradigm of instruction and learning that attempts to overcome both distance and time constraints found in traditional classroom learning. The electronic classrooms at two sites of the University of Oslo and two further sites in Norway overcome separations in space by exchanging digital audio, video, and whiteboard information via the Norwegian academic ATM-based network Supernett II. The electronic classrooms are used since 1993 for teaching graduate level courses. This paper presents measurements and analysis results of transport, application, and user level Quality-of-Service (QoS) of the electronic classrooms. We describe our general experiences with this system for synchronous IDL. The lessons learned represent the motivation for the ongoing extension to support asynchronous IDL by a multimedia database system (MMDBS) to manage all data used and generated in the electronic classrooms. 相似文献
87.
M Vives JM Porcel M Vicente de Vera E Ribelles M Rubio 《Canadian Metallurgical Quarterly》1996,109(6):1503-1507
STUDY OBJECTIVE: To determine the usefulness of modifying Light's criteria for the separation of pleural transudates from exudates. DESIGN: Retrospective review of patients who underwent a diagnostic thoracentesis during a 2-year period. SETTING: Community teaching hospital in Lleida, Spain. PATIENTS AND METHODS: Clinical records and pleural fluid characteristics of 230 consecutive patients with pleural effusion underwent a detailed review. Thirty-five of these patients were excluded from the analysis. As suggested recently by Romero et al, different cutoff levels for the criteria of Light et al were applied and their accuracies were calculated. RESULTS: Thirty-nine (20%) pleural effusions were transudates and 156 (80%) were exudates. The accuracy of the criteria of Light et al for identifying exudates was 94.7% (confidence interval, 91.6 to 97.9) in comparison to our own modified criteria (93.1%; confidence interval, 89.5 to 96.7) and the criteria suggested by Romero et al (92.6%; confidence interval, 88.9 to 96.3). These differences were not statistically significant. CONCLUSION: Changing the classic Light's criteria with different cutoff points offers no advantages for discriminating between transudative and exudative pleural effusions. 相似文献
88.
Seasonal affective disorder (SAD) is characterized by annual major depressive episodes. It occurs most commonly in young women during autumn and winter with full remission during the following spring. The patient's mood is a combination of depression and anxiety accompanied by fatigue, loss of libido, and a reduction of socialization. Most of these patients complain of atypical vegetative symptoms (e.g. hypersomnia, carbohydrate craving, and weight gain). Hypotheses on the underlying mechanisms of these behavioural disorders indicate that environmental variables, e.g. climate, latitude, light, and changes in neurotransmitter function that occur naturally with the seasons, may be important. Phototherapy is being used increasingly for the treatment of SAD. The antidepressant response is contingent on the exposure of the patients' eyes to light. The biological basis of the diverse psychological and biological changes in SAD and the underlying mechanism of action of phototherapy are still unclear and require further study. 相似文献
89.
The glucose transporter protein syndrome (GTPS) is caused by defective transport of glucose across the blood-brain barrier via the glucose transporter GLUT1, resulting in hypoglycorrhachia, infantile seizures, and developmental delay. Recent reports indicated that GLUT1 is a multifunctional transporter. We investigated the transport of vitamin C in its oxidized form (dehydroascorbic acid) via GLUT1 into erythrocytes of 2 patients with GTPS. In both patients, uptake of oxidized vitamin C was 61% of the mothers' values. Our findings are consistent with recent observations that vitamin C is transported in its oxidized form via GLUT1. We speculate that impaired transport of this substrate and perhaps other substrates in GTPS might contribute to the pathophysiology of this condition. 相似文献
90.
Tharinger Deborah J.; Lambert Nadine M.; Bricklin Patricia M.; Feshbach Norma; Johnson Neal F.; Oakland Thomas D.; Paster Vera S.; Sanchez William 《Canadian Metallurgical Quarterly》1996,27(1):24
National, state, and local education reform agendas have been on a fast track for more than a decade. Although some psychologists have been active in promoting psychology and psychological services in education reform initiatives, knowledge about their efforts is fragmented. In order to educate psychologists about education reform, this article highlights the impetus for the recent education reform movement, briefly reviews the latest waves of education reform, and discusses the development of the National Education Goals. Then, an argument is made for the integration of education, health, and social reform initiatives; state-level education reform principles and initiatives are highlighted, illustrated by the systemic education reform mandate in Kentucky. Next, progress toward the development and implementation of an APA-sponsored response to the National Education Goals is discussed. Finally, objectives and roles for psychologists in advancing education reform are presented, and guidelines for the education and training of future psychologists are introduced. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献