全文获取类型
收费全文 | 103篇 |
免费 | 10篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 15篇 |
机械仪表 | 2篇 |
建筑科学 | 4篇 |
能源动力 | 1篇 |
轻工业 | 24篇 |
无线电 | 2篇 |
一般工业技术 | 11篇 |
冶金工业 | 9篇 |
自动化技术 | 43篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 7篇 |
2015年 | 1篇 |
2014年 | 8篇 |
2013年 | 10篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 5篇 |
2009年 | 6篇 |
2008年 | 8篇 |
2007年 | 4篇 |
2006年 | 2篇 |
2005年 | 5篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 5篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1985年 | 2篇 |
排序方式: 共有113条查询结果,搜索用时 16 毫秒
81.
Angel Vilanova Jaime Fernandez-Gomez Galit Agranati Landsberger 《Construction and Building Materials》2011,25(8):3417-3426
This study includes an analysis of the applicability of current models used for estimating the mechanical properties of conventional concrete to self-compacting concrete. The mechanical properties evaluated are: modulus of elasticity, tensile strength, and modulus of rupture. An extensive database which included the dosifications and the mechanical properties of 627 mixtures from 138 different references, was used. The models considered are: ACI, EC-2, NZS 3101:2006 (New Zealand code) and the CSA A23.3-04 (Canadian code). The precision in estimating the modulus of elasticity and tensile strength is acceptable for all models; however, all models are less precise in estimating the modulus of rupture. 相似文献
82.
Alexander Mozalev Raul Calavia Rosa M. Vázquez Isabel Gràcia Carles Cané Xavier Correig Xavier Vilanova Francesc Gispert-Guirado Jaromír Hubálek Eduard Llobet 《International Journal of Hydrogen Energy》2013
Practical microsensors for fast, highly sensitive hydrogen gas detection were fabricated by combining silicon integral technology for MEMS microhotplate platform with newly developed technological, electrical, and electrolytic conditions for forming nanostructured porous-anodic-alumina-templated WO3 layer as the sensing material. The morphology–structure–property relationship for the nanostructured sensing layer was determined by scanning electron microscopy, X-ray diffraction, and through systematically investigating the sensor performance at various H2 concentrations (5–1000 ppm) and operating temperatures (20–350 °C). The sensors showed superior sensitivity to hydrogen gas, with the lowest detection limit ever reported for WO3 semiconductors (5 ppm), the fast response and recovery times (2–3 min), and the best sensitivity at 150 °C, which was 100 times higher than that of a reference sensor having a smooth WO3 active film. The technology developed enables high-volume, low-cost, and low-power sensor-on-a-chip solution for a hydrogen-based energy economy where the use of highly sensitive and low-power-consuming devices is encouraged. 相似文献
83.
Carlos Rocha Gomes Torres Taciana Marco Ferraz Caneppele Alessandra Buhler Borges Aline Vilanova Shoji Talita Macedo Nunes Graziela Ribeiro Batista 《The Journal of Adhesion》2013,89(11):1099-1111
The effect of application methods and dentin hydration on the bond strength of three self-etching adhesives (SEA) were evaluated; 195 extracted bovine incisors were used. The buccal surface was ground in order to expose the dentin, which remained 2-mm minimum thickness, measured by a thickness meter through an opening on the lingual surface. Adper Single Bond 2? was used for the control group. The SEA were applied following two modes of application: passive or active and two hydration states of the dentin surface—dry and wet. After light-curing, composite buildups were made using Grandio? composite. The specimens were sectioned and tested with a microtensile bond strength test. The application method and the hydration state resulted in statistical differences (p = 0.000) making the values of active application for μTBS to dentin higher than passive application. The wet surfaces showed higher μTBS to dentin ratios than dry surfaces. There were no statistical differences in μTBS among the SEA tested but there were differences regarding to control group. 相似文献
84.
Three sewage waters with different sources of faecal pollution (human, pig and mixed origin) were analysed. Enumeration of Enterococci was performed and representative strains for each sample were isolated. Biochemical fingerprints of these strains were obtained by using a simple automated microplate system. The structure and composition of the Enterococci populations were studied and the most representative biochemical profiles were determined by cluster analysis. The diversity index was high for all the sewage waters sampled. The enterococcal populations detected in the three kinds of sewage waters were similar. Although many of the representative strains were found in the three kinds of samples, some strains were detected only in human sewage and others only in pig slurry. 相似文献
85.
86.
A PSPICE model of quartz crystal microbalance (QCM) gas/odour sensors is presented which simulates the response of polymer-coated QCM devices to gases, taking into account the effects of ambient temperature and humidity. The model enables the associated drive circuitry to be rapidly prototyped and electronic nose equipment to be optimised 相似文献
87.
88.
Modelling the simultaneous production and separation of acetic acid from CO2 using an anion exchange membrane microbial electrosynthesis system
下载免费PDF全文
![点击此处可从《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
89.
The growth of new vascular networks from pre-existing capillaries (angiogenesis) plays a pivotal role in tumor development. Mathematical modeling of tumor-induced angiogenesis may help understand the underlying biology of the process and provide new hypotheses for experimentation. Here, we couple an existing deterministic continuum theory with a discrete random walk, proposing a new model that accounts for chemotactic and haptotactic cellular migration. We propose an efficient numerical method to approximate the solution of the model. The accuracy, stability and effectiveness of our algorithms permitted us to perform large-scale three-dimensional simulations which, in contrast to two-dimensional calculations, show a topological complexity similar to that found in experiments. Finally, we use our model and simulations to investigate the role of haptotaxis and chemotaxis in the mobility of tip endothelial cells and its influence in the final vascular patterns. 相似文献
90.
Rodriguez-Abreu C Vilanova N Solans C Ujihara M Imae T López-Quintela A Motojima S 《Nanoscale research letters》2011,6(1):330
Hollow silica microcoils have been prepared by using functionalized carbon microcoils as hard templates and surfactant or
amphiphilic dye aggregates as soft templates. The obtained materials have been characterized by electron and optical microscopy,
nitrogen sorption and small angle X-ray scattering. The obtained hollow microcoils resemble the original hard templates in
shape and size. Moreover, they have mesoporous walls (pore size ≈ 3 nm) with some domains where pores are ordered in a hexagonal
array, originated from surfactant micelles. The obtained silica microcoils also show preferential adsorption of cationic fluorescent
dyes. A mechanism for the formation of silica microcoils is proposed. 相似文献