全文获取类型
收费全文 | 89篇 |
免费 | 5篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 33篇 |
金属工艺 | 3篇 |
建筑科学 | 4篇 |
矿业工程 | 1篇 |
能源动力 | 6篇 |
轻工业 | 15篇 |
无线电 | 3篇 |
一般工业技术 | 17篇 |
冶金工业 | 7篇 |
自动化技术 | 3篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 5篇 |
2014年 | 5篇 |
2013年 | 4篇 |
2012年 | 5篇 |
2011年 | 10篇 |
2010年 | 9篇 |
2009年 | 2篇 |
2008年 | 6篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2002年 | 2篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有94条查询结果,搜索用时 843 毫秒
1.
Software developers often need to understand a large body of unfamiliar code with little or no documentation, no experts to consult, and little time to do it. A post appeared in January 2008 on Slashdot, a technology news Web site, asking for tools and techniques that could help. This article analyzes 301 often passionate and sometimes articulate responses to this query, including the themes and the associated tool recommendations. The most common suggestions were to use a code navigation tool, use a design recovery tool, use a debugger to step through the code, create a runtime trace, use problem-based learning, ask people for help, study the code from top down, and print out all the code. This analysis presents an intriguing snapshot of how software developers in industry go about comprehending big code. 相似文献
2.
Condition evaluation of existing reinforced concrete bridges using fuzzy based analytic hierarchy approach 总被引:2,自引:1,他引:1
There is an urgent need for a systematic methodology for condition assessment of the bridges because the old bridges of most of the countries are inadequate to carry current-day traffic and satisfy the present codal provisions and even in newer bridges, deterioration caused by unforeseen service condition and deferred maintenance is of great concern. In view of this, an attempt has been made in this study to develop a systematic procedure and formulations for condition evaluation of existing bridges using Analytic Hierarchy Process in a fuzzy environment. Analytic Hierarchy Process (AHP) is an efficient decision making tool for complicated problems with multiple evaluation criteria and uncertainty. Fuzzy logic approach has been used to take care of the uncertainties and imprecision in the bridge inspector’s observations. In this paper, first, a methodology has been proposed for condition ranking of number of reinforced concrete (RC) bridges. Then, based on the results obtained from prioritization, rating of the most deserved bridge has been carried out using MADM based fuzzy logic. Computer programs have been developed based on the formulations presented in this paper for evaluating condition of existing bridges and the details are presented in the paper. The methodology and its application are demonstrated through a case study. This methodology would certainly help the engineers and policy makers concerned with bridge management to overcome the problem related to prioritization and decision on funding related to rehabilitation of bridges. 相似文献
3.
Saptarshi Sasmal K. Ramanjaneyulu Balthasar Novák V. Srinivas K. Saravana Kumar Christian Korkowski Constanze Roehm N. Lakshmanan Nagesh R. Iyer 《Construction and Building Materials》2011,25(1):175-182
The paper discusses the aspects of repair and retrofitting technique adopted for a damaged reinforced concrete beam-column joint specimen under cyclic loading. A specimen designed based on Indian Standard specifications with consideration of seismic load but without adopting ductile detailing (NonDuctile) was investigated under reverse cyclic loading. Then, the damaged nonductile specimen was repaired with epoxy mortar and grouted using low viscous polymer, and retrofitted using fiber reinforced plastic (FRP) wrapping in beam and column components and steel plate jacketing in joint region. The experimental results showed that the retrofitted specimen not only regained its original strength and stiffness but also has overcome the deficiencies of nonductile detailing. The present study shows that a proper repair and adequate retrofitting technique can be used for strengthening and improvement of damaged regions in reinforced concrete structures. 相似文献
4.
5.
Sukanya Luang James R. Ketudat Cairns Victor A. Streltsov Maria Hrmova 《International journal of molecular sciences》2010,11(7):2759-2769
Wild-type and variant crystals of a recombinant enzyme β-d-glucan glucohydrolase from barley (Hordeum vulgare L.) were obtained by macroseeding and cross-seeding with microcrystals obtained from native plant protein. Crystals grew to dimensions of up to 500 × 250 × 375 μm at 277 K in the hanging-drops by vapour-diffusion. Further, the conditions are described that yielded the wild-type crystals with dimensions of 80 × 40 × 60 μm by self-nucleation vapour-diffusion in sitting-drops at 281 K. The wild-type and recombinant crystals prepared by seeding techniques achived full size within 5–14 days, while the wild-type crystals grown by self-nucleation appeared after 30 days and reached their maximum size after another two months. Both the wild-type and recombinant variant crystals, the latter altered in the key catalytic and substrate-binding residues Glu220, Trp434 and Arg158/Glu161 belonged to the P43212 tetragonal space group, i.e., the space group of the native microcrystals was retained in the newly grown recombinant crystals. The crystals diffracted beyond 1.57–1.95 Å and the cell dimensions were between a = b = 99.2–100.8 Å and c = 183.2–183.6 Å. With one molecule in the asymmetric unit, the calculated Matthews coefficients were between 3.4–3.5 Å3·Da−1 and the solvent contents varied between 63.4% and 64.5%. The macroseeding and cross-seeding techniques are advantageous, where a limited amount of variant proteins precludes screening of crystallisation conditions, or where variant proteins could not be crystallized. 相似文献
6.
Yuanyuan Zhang Li Wang Soumyadeep Dey Mawadda Alnaeeli Sukanya Suresh Heather Rogers Ruifeng Teng Constance Tom Noguchi 《International journal of molecular sciences》2014,15(6):10296-10333
Erythropoietin (EPO) regulation of red blood cell production and its induction at reduced oxygen tension provides for the important erythropoietic response to ischemic stress. The cloning and production of recombinant human EPO has led to its clinical use in patients with anemia for two and half decades and has facilitated studies of EPO action. Reports of animal and cell models of ischemic stress in vitro and injury suggest potential EPO benefit beyond red blood cell production including vascular endothelial response to increase nitric oxide production, which facilitates oxygen delivery to brain, heart and other non-hematopoietic tissues. This review discusses these and other reports of EPO action beyond red blood cell production, including EPO response affecting metabolism and obesity in animal models. Observations of EPO activity in cell and animal model systems, including mice with tissue specific deletion of EPO receptor (EpoR), suggest the potential for EPO response in metabolism and disease. 相似文献
7.
New galvanic cell designs, incorporating one or two buffer electrodes, are developed to minimize the electrode polarization
caused by electrochemical permeability of the electrolyte at high temperature. When a nonpolarizable reference electrode is
employed, a cell with three-electrode compartments can be used to measure the chemical potential of oxygen in two-phase fields
of ternary systems, associated with one degree of freedom at constant temperature. A buffer electrode is placed between the
reference and measuring electrodes. The buffer electrode, maintained at approximately the same oxygen chemical potential as
the measuring electrode, absorbs the semipermeability flux of oxygen between reference and measuring electrodes.
When the reference electrode is polarizable, two buffer electrodes are required between the reference and measuring electrodes.
The reference and reference-buffer electrodes have the same chemical potential of the active species. Similarly the measuring
electrode and its buffer are of approximately the same chemical potential. A significant chemical potential difference exists
only between the two buffers, which may become polarized due to coupled transport of ions and electronic defects through the
electrolyte. Since the reference and measuring electrodes are insulated, the emf of the solid state cell is unaffected. The
use of the buffer electrode designs permit more accurate thermodynamic measurements on metal and ceramic systems at high temperature. 相似文献
8.
The thermodynamic properties of Na2CO3-Na2SO4 solid solution with hexagonal structure have been measured in the temperature range of 873 to 1073 K, using a composite-gradient
solid electrolyte. The cell used can be represented as Pt, CO2′ + O2∥ Na2CO3Na2 (CO3)x(SO4)1-x) ∥ CO2″ + O2″, Pt The composite-gradient solid electrolyte consisted of pure Na2CO3 at one extremity and the solid solution under study at the other, with variation in composition across the electrolyte. A
CO2 + O2 + Ar gas mixture was used to fix the chemical potential of sodium at each electrode. The Nernstian response of the cell to
changes in partial pressures of CO2 and O2 at the electrodes has been demonstrated. The activity of Na2CO3 in the solid solution was measured by two techniques. In the first method, the electromotive force (emf) of the cell was
measured with the same CO2 + O2 + Ar mixture at both electrodes. The resultant emf is directly related to the activity of Na2CO3 at the solid solution electrode. By the second approach, the activity was calculated from the difference in compositions
of CO2 + O2 + Ar mixtures at the two electrodes required to produce a null emf. Both methods gave identical results. The second method
is more suitable for gradient solid electrolytes that exhibit significant electronic conduction. The activity of Na2CO3 exhibits positive deviation from Raoult’s law. The excess Gibbs’ energy of mixing of the solid solution can be represented
using a subregular solution model such as the following: ΔGE
= X(1 - X)[6500(±200)X + 3320(±80)(l - X)] J mol-1 whereX is the mole fraction of Na2CO3. By combining this information with the phase diagram, mixing properties of the liquid phase are obtained. 相似文献
9.
Biswarup Basak Sukanya Parui 《International Journal of Circuit Theory and Applications》2008,36(4):387-396
The bifurcation phenomena have been studied in current mode‐controlled ?uk converter considering continuous conduction as well as discontinuous conduction mode of operation. Some peculiarities have been observed in discontinuous conduction mode, which indicate some incompleteness of the bifurcation diagrams in providing details of the system behaviour. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
10.
The 9‐point hedonic scale and hedonic ranking in food science: some reappraisals and alternatives
下载免费PDF全文
![点击此处可从《Journal of the science of food and agriculture》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Sukanya Wichchukit Michael O'Mahony 《Journal of the science of food and agriculture》2015,95(11):2167-2178
The 9‐point hedonic scale has been used routinely in food science, the same way for 60 years. Now, with advances in technology, data from the scale are being used for more and more complex programs for statistical analysis and modeling. Accordingly, it is worth reconsidering the presentation protocols and the analyses associated with the scale, as well as some alternatives. How the brain generates numbers and the types of numbers it generates has relevance for the choice of measurement protocols. There are alternatives to the generally used serial monadic protocol, which can be more suitable. Traditionally, the ‘words’ on the 9‐point hedonic scale are reassigned as ‘numbers’, while other ‘9‐point hedonic scales’ are purely numerical; the two are not interchangeable. Parametric statistical analysis of scaling data is examined critically and alternatives discussed. The potential of a promising alternative to scaling itself, simple ranking with a hedonic R‐Index signal detection analysis, is explored in comparison with the 9‐point hedonic scale. © 2014 Society of Chemical Industry 相似文献