全文获取类型
收费全文 | 301篇 |
免费 | 16篇 |
国内免费 | 26篇 |
专业分类
电工技术 | 24篇 |
综合类 | 4篇 |
化学工业 | 63篇 |
金属工艺 | 25篇 |
机械仪表 | 6篇 |
建筑科学 | 10篇 |
矿业工程 | 1篇 |
能源动力 | 23篇 |
轻工业 | 54篇 |
水利工程 | 3篇 |
石油天然气 | 3篇 |
无线电 | 9篇 |
一般工业技术 | 75篇 |
冶金工业 | 8篇 |
原子能技术 | 18篇 |
自动化技术 | 17篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 13篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 8篇 |
2017年 | 8篇 |
2016年 | 10篇 |
2015年 | 3篇 |
2014年 | 10篇 |
2013年 | 25篇 |
2012年 | 12篇 |
2011年 | 27篇 |
2010年 | 15篇 |
2009年 | 22篇 |
2008年 | 27篇 |
2007年 | 14篇 |
2006年 | 7篇 |
2005年 | 9篇 |
2004年 | 11篇 |
2003年 | 13篇 |
2002年 | 6篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 14篇 |
1996年 | 5篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1969年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有343条查询结果,搜索用时 890 毫秒
71.
Takamasa OKUMURA Taro YAEGASHI Takahiro FUJIWARA Katsuyuki TAKAHASHI Koichi TAKAKI Tomo KUDO 《等离子体科学和技术》2018,20(4):44008-56
A pulsed electric field(PEF) was applied to unpasteurized sake at constant temperatures, at which α-amylase was not inactivated. We adjusted the input energy to be identical for the temperatures by changing the number of PEF application, because the current significantly increased with the temperature, even the amplitude of the applied voltage was identical. As a result, the α-amylase was seemed to be inactivated by PEF application, not due to thermal effect.The glucoamylase was significantly inactivated by PEF. Moreover, the acid carboxypeptidase was inactivated by PEF at 4 °C but significantly activated at 25 °C. These results show that the sensitivity of enzyme to PEF application differs depending on the types of enzyme and treatment temperature. On the other hand, the colony number of bacteria was remarkably decreased, but the amount of the volatile flavor compounds was not decreased by PEF application. 相似文献
72.
73.
Salmon steaks were broiled using infrared radiation and compared to convection oven baking. Total percent cooking losses of moisture and fat content were not significantly different. Samples broiled by infrared oven retained 87.2% and 92.6% of thiamin and riboflavin content, respectively. There were no significant differences for vitamin retention by both methods. Appearance and color of salmon steaks baked in the convection oven were rated significantly higher than infrared broiled samples. Tenderness and juiciness scores for infrared broiled steaks were significantly higher than those for convection oven baked steaks. There were no significant differences in panel scores for odor, flakiness, flavor and overall acceptability of steaks prepared by both methods. 相似文献
74.
Kiyoshi Dowaki Shunsuke Mori Chihiro Fukushima Noriyasu Asai 《Electrical Engineering in Japan》2005,153(3):52-63
This paper presents a comprehensive economic analysis of biomass gasification systems. There has recently been interest in promoting biomass energy systems in Japan's domestic sector. However, there are problems in achieving this project. The costs of plant construction are very high compared with conventional plants. Accordingly, the unit costs of electricity will be increased to levels comparable with those of other environmental energy systems. Copyright © 2004 Wiley Periodicals, Inc. In this paper, biomass energy systems using woody biomass are proposed from the viewpoint of successful environmental business. Biomass integrated gasification combined cycle (BIGCC) plants operated by independent power producers and biomass gasification cogeneration (BGCGS) plants in sawmills or asphalt‐concrete production factories have the potential for implementation in the near future. Our analysis concludes that the systems proposed in this paper provide the following outcomes with subsidies: (1) the generating cost of BIGCC ranges from 15.1 to 36.6 yen/kWh, (2) the generating cost of BGCGS ranges from 2.6 to 32.2 yen/kWh, and (3) the cost reduction of BGCGS products in asphalt factories amounts to about 60 million yen per year. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 153(3): 52–63, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20089 相似文献
75.
MINORU TAKAHASHI SUGURU SUZUKI HIDETO NITANADA EIKI ARAI 《Journal of the American Ceramic Society》1988,71(12):1093-1099
Rheological properties were investigated for combinations of six different alumina and three thermoplastic resins of polyethylene, polypropylene, and polystyrene. The curves of torque versus time in the alumina/resin mixture systems could be classified into four patterns depending on both the mixing properties of each of the resins and the solid concentration. It was verified through infrared spectroscopy and gel permeation chromatography measurements that the behavior of the mixtures could be explained by taking the degradation of each resin into account. Flow was characterized as shear thinning in both the alumina/resin and resin systems. A simple parameter, V¯p = (ρcr − V¯)/ρcr , a kind of corrected liquid volume concentration, was introduced to express the dependence of relative viscosity ηr of the mixture on the solid concentration V¯ and the relative compaction density ρcr . The relation ηr =αV¯−β p could be useful for estimation of the flow properties of ceramic powder/resin mixture systems. 相似文献
76.
MAKOTO HATTORI YOICHI AIBA KOICH NAGASAWA KOJI TAKAHASHI 《Journal of food science》1996,61(6):1171-1176
Two bovine β-lactoglobulin-alginic acid (β-LG-ALG) conjugates were prepared to improve the function of ALG by using water-soluble carbodiimide and the Maillard reaction. Fluorescence studies suggested that the conformation around Trp had been changed in each conjugate and that the surface of each conjugate was covered with polysaccharide chain. Structural analyses with monoclonal antibodies indicated that the conformation around 15Val-29IIe (β -sheet) in each conjugate had changed, while the native structure was maintained around 125Thr-135Lys (α-helix). After conjugating with β -LG, ALG showed retinol-binding and high emulsifying ability. The aggregating property of ALG in acid and in the presence of Ca2+ was improved in each conjugate. 相似文献
77.
78.
Eating of agar and gelatin gels in the mouth was studied dynamically in detail. The palatal presures on agar and gelatin gels of various concentrations and dimensions were detected by pressure transducers installed at three locations of the palate. For each of the gels, Pm (the maximum palatal pressure at the initial stage of mastication), P (the mean palatal pressure), W (work), and T (retaining time in the mouth) changed significantly when their concentrations increased. Moreover, gel dimensions also affected Pm, P and W. For a bite-size gel, Pm, P and W increased or remained constant, while for a finer sized gel, Pm, P and W were nearly constant regardless of the increase in rupture strength or gel concentration. 相似文献
79.
80.
The Tonle Sap River (TSR) serves as a natural medium for the reversal flow between Tonle Sap Lake (TSL) and the Mekong River to sustain productivity and biodiversity in the TSR floodplain and TSL. Understanding the hydrological connectivity and its dynamics in the TSR, including its floodplain, is therefore important to support activities that aim to maintain ecological services in the TSR–TSL system. Thus, the main objective of this study is to examine the hydrological connectivity of the TSR and its floodplain by a modelling approach that integrates inundation patterns and sediment dynamics. The Caesar–Lisflood model was applied to describe inundation, sediment erosion, transport, and deposition in the TSR for the period of 2003–2013. The inundation areas connected to the TSR ranged from 140 to 2,327 km2, whereas the isolated inundation areas from the TSR ranged from 0.27 to 504 km2. Sediment dynamics showed its influence on inundation patterns and hydrological connectivity and could alter the yearly inundation ratio (defined as a normalized inundation frequency with a value ranging from 0 to 1) up to 0.8. Our approach provides a quantitative way to determine key factors (e.g., total inundation areas, seasonality, and connectivity of inundation patterns) for further investigation of ecological processes in relation to the inundation patterns and sediment dynamics in the TSR and TSL. 相似文献