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排序方式: 共有80条查询结果,搜索用时 15 毫秒
1.
Geoffrey M. Rowe Jay N. Meegoda Andris Jumikis Mark J. Sharrock Nishantha Bandara Chamil H. Hettiarachchi 《Canadian Metallurgical Quarterly》2004,130(6):924-934
Abstract: This paper describes the research funded by the New Jersey Department of Transportation to develop an automated technology to monitor segregation during construction of hot-mix asphalt concrete pavements. A Laser-based system was used to measure surface texture and to detect segregation. Two segregated test sections and a control test section were tested to evaluate the applicability of Laser texture method to detect and quantify segregation. Laser texture data were gathered from all three sections. Ratios of texture in segregated areas to that in nonsegregated areas were set as the basis for detection of different levels of segregation. By combining the level of segregation and extent of segregation, an AREA index was developed to determine the acceptability of a pavement section. Based on AREA index, pay adjustment factors were proposed to reduce the payment to account for loss of pavement life due to segregation. Further remedial actions were proposed to correct segregated pavement sections with acceptable AREA index. Based on the above concepts, Windows-based computer program NJTxtr was developed to detect and quantify segregation. This computer program uses the Laser-equipment-collected pavement texture data and determines whether the pavement section is acceptable or unacceptable based on the level of segregation within a pavement section, and provides bonus or penalties to the contractor. The paper describes a novel technology using laser and associated software for construction quality control of asphalt concrete pavements. The proposed methodology was applied to detect segregation in an interstate highway section in New Jersey, and this section was repaved based on visual observation and recommendation from this study. 相似文献
2.
WANG Jiang FAUTRELLE Yves REN Zhong-ming LI Xi NGUYEN-THI Henri MANGELINCK-NOEL Nathalie SALLOUM ABOU JAOUDE Georges ZHONG Yun-bo KALDRE Imants BOJAREVICS Andris BULIGINS Leonid 《钢铁研究学报(英文版)》2012,(Z1):381-385
Sn-3wt%Pb alloy was directionally solidified without and with a 0.08T transverse magnetic field(TMF),and real-time recorded by in-situ synchrotron X-ray imaging.Results indicate that TMF shortened the distance from the location of nucleation to the advancing interface,and accelerated the growth rate of the equiaxed crystal,which caused the columnar-to-equiaxed transition(CET)finally.The thermoelectromagnetic convection(TEMC)in front of the interface and around the crystal’s dendritic branch should respond to changes of the distance and the growth rate. 相似文献
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Prabhakaran Thandapani Mangalaraja Ramalinga Viswanathan Marcus Vinícius-Araújo Andris F. Bakuzis Fanny Béron Arun Thirumurugan Juliano C. Denardin Jose A. Jiménez Ali Akbari-Fakhrabadi 《Journal of the American Ceramic Society》2020,103(9):5086-5097
The study demonstrates the performance of heating efficiency in single-phase and binary phase spinel ferrite nanosystems. Ferrimagnetic cobalt ferrite (CoFe2O4) (CFO) and superparamagnetic copper ferrite/copper oxide (CuFe2O4/CuO) (CuF) nanosystems of different particle sizes were synthesized through a microwave-assisted coprecipitation method. The heating behavior was observed in range of both field amplitudes (8-24 kA/m at 516 kHz) and frequencies (325-973 kHz at 12 kA/m). The heating efficiency was analyzed and compared by means of particle size, magnetization, effective anisotropy constant, and Néel relaxation mechanism. Indeed, the heating rate was maximized in larger ferrite particles with low effective anisotropy constant. Moreover, though the magnetization and effective anisotropy constant of single-phase CoFe2O4 nanoparticles were higher, the binary phase CuFe2O4/CuO nanosystems of similar crystallite size (28 nm) exhibited superior heating efficiency (4.21°C/s). For a field amplitude and frequency of 24 kA/m and 516 kHz, the heating rate of CuF and CFO ferrites with different crystallite sizes decreased in the order of 4.21 > 2.14 > 0.58 > 0.52°C/s for 29 nm > 25 nm > 12 nm > 15 nm, respectively. The results emphasize that binary phase ferrite nanoparticles are better thermoseeds than the single-phase ferrites for the magnetic hyperthermia application. 相似文献
5.
Linards Lap
inskis Kaspars Mlnieks Juris Blms Mris Knite Sven Oras Tanel Kmbre Sergei Vlassov Mikk Antsov Martin Timusk Andris utka 《大分子材料与工程》2020,305(1)
In the present work, the contact electrification of polymers that differ in adhesion strength is studied. Electrical current is measured along with adhesion in macroscale contacting‐separation experiments. Additionally, local adhesion and roughness are studied with atomic force microscopy to get deeper insight into relations between surface properties and electrification. Measurements reveal that higher surface charge is formed on more adhesive surfaces, thus confirming covalent bond cleavage as a mechanism for contact electrification of polymers. Investigated materials possess enhanced contact electrification making them attractive candidates for the conversion of mechanical energy to electrical in triboelectric nanogenerator devices. 相似文献
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Joonho Chang Seung Ki Moon Wonmo Kim Matthew Parkinson Andris Freivalds 《Ergonomics》2018,61(5):670-681
This study presents usability considerations and solutions for the design of glasses-type wearable computer displays and examines their effectiveness in a case study. Design countermeasures were investigated by a four-step design process: (1) preliminary design analysis; (2) design idea generation; (3) final design selection; and (4) virtual fitting trial. Three design interventions were devised from the design process: (1) weight balance to reduce pressure concentrated on the nose, (2) compliant temples to accommodate diverse head sizes and (3) a hanger mechanism to help spectacle users hang their wearable display on their eye glasses. To investigate their effectiveness, in the case study, the novel 3D glasses adopting the three interventions were compared with two existing 3D glasses in terms of neck muscle fatigue and subjective discomfort rating. While neck muscle fatigue was not significantly different among the three glasses (p = 0.467), the novel glasses had significantly smaller discomfort ratings (p = 0.009).
Relevance to Industry: A four-step design process identified usability considerations and solutions for the design of glasses-type wearable computer displays. A novel 3D glasses was proposed through the process and its effectiveness was validated. The results identify design considerations and opportunities relevant to the emerging wearable display industry. 相似文献
8.
DA Andris 《Canadian Metallurgical Quarterly》1998,7(2):76-82, 98; quiz 83-4
Malnutrition is common in the hospitalized surgical patient. There is a strong association between improved nutritional status and a favorable postoperative recovery, while malnutrition has an adverse effect on surgical outcome (Driscoll & Blackburn, 1990; Souba, 1997). Advances in providing parenteral nutrition have had a positive impact on nutrition care of these patients and will be reviewed in this article. 相似文献
9.
Nonhomogeneity of light modulation by PLZT retardation plates - temporal due to the secondary electrooptic effect, and spatial due to the interference of directly transmitted and reflected light beams in birefringent substance has been discussed. 相似文献
10.
Neil A. Davidoff Andris Freivalds 《International Journal of Industrial Ergonomics》1993,12(4):255-264
Anthropometric measurements were made of the hands of 32 subjects. Data from this survey were used in the design of a graphic model of the male human hand. The model was created in the computer-aided design (CAD) package CATIA and reproduced any desired overall hand size. It was made up of 24 solid segments with 23 degrees of freedom at 17 moveable joints. Spans and grasping sizes of the model hand were examined. The representation of the model appeared realistic in several postures, but the model was found to allow some motions which would be impossible for an actual hand. The model could be used to help a designer visualize hand-held products and controls in use. 相似文献