全文获取类型
收费全文 | 1262篇 |
免费 | 34篇 |
国内免费 | 6篇 |
学科分类
工业技术 | 1302篇 |
出版年
2024年 | 2篇 |
2023年 | 6篇 |
2022年 | 13篇 |
2021年 | 27篇 |
2020年 | 19篇 |
2019年 | 16篇 |
2018年 | 36篇 |
2017年 | 32篇 |
2016年 | 32篇 |
2015年 | 21篇 |
2014年 | 44篇 |
2013年 | 80篇 |
2012年 | 66篇 |
2011年 | 87篇 |
2010年 | 53篇 |
2009年 | 75篇 |
2008年 | 82篇 |
2007年 | 53篇 |
2006年 | 42篇 |
2005年 | 48篇 |
2004年 | 46篇 |
2003年 | 44篇 |
2002年 | 37篇 |
2001年 | 29篇 |
2000年 | 14篇 |
1999年 | 29篇 |
1998年 | 48篇 |
1997年 | 25篇 |
1996年 | 26篇 |
1995年 | 25篇 |
1994年 | 16篇 |
1993年 | 15篇 |
1992年 | 13篇 |
1991年 | 9篇 |
1990年 | 8篇 |
1989年 | 12篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 6篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1980年 | 4篇 |
1979年 | 5篇 |
1977年 | 6篇 |
1976年 | 3篇 |
1973年 | 2篇 |
1971年 | 1篇 |
1970年 | 2篇 |
排序方式: 共有1302条查询结果,搜索用时 15 毫秒
991.
Masao Kato Kazuhiro Kanda Tatsumi Kimura Hiro Matsuda Hachiro Nakanishi 《Polymer Bulletin》1996,36(4):407-414
Summary Novel photocrosslinkable second-order nonlinear optical(NLO) polymers were synthesized from radical homopolymerization of 4-[N-ethyl-N-(2-methacryloyloxyethyl)]amino-4-(2-cinnamoyloxyethyloxycarbonyl)-2-nitroazobenzene(MACN) or copolymerization of MACN with 2-(cinnamoxyloxy)ethyl methacrylate(CM), and from polycondensation of 4-[N,N-bis(2-hydroxyethyl)]amino-4-(2-cinnamoyloxyethyloxycarbonyl)-2-nitroazobenzene(HACN) with p-phenylenediacyloyl chloride(PD). For the purpose of obtaining an optimized condition of UV irradiation for poling treatment involving photocrosslinking, photoreactivity of these NLO polymer films was investigated. There was observed considerably different photoreaction behavior, especially in photofading of the NLO chromophore, between MACN polymer and HACNPD polycondensate; the latter faded more rapidly than the former. A reason for this phenomenon was considered. 相似文献
992.
Artificial Life and Robotics - Swarm robotics (SR) is a research field about how to design a large number of robots so that they can generate meaningful collective behaviors. One of the promising... 相似文献
993.
Masanori Yoshida Masashi Watanabe Kazuaki Yamagiwa Akira Ohkawa Masahiko Abe Shuichi Tezura Masuo Shimazaki 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2002,77(6):678-684
The behaviour of gas–liquid mixtures in the vicinity of the blades of an unsteadily rotating impeller in an unbaffled agitated vessel was studied by observations made with a rotating camera. The impellers used were a disk turbine impeller with six flat blades (DT) and a novel cross‐type impeller with four delta blades (CD). The behaviour of gas–liquid mixtures near the blades of the forward–reverse rotating impeller was unsteady in terms of the formation of cavities behind the blades and their dispersion into gas bubbles, and differed from that near the blades of a unidirectionally, steadily rotating impeller. The differences in relative power consumption between the forward–reverse rotating impellers in the unbaffled vessel and the steadily rotating impellers in the baffled vessel are discussed in relation to the differences in the behaviour of gas–liquid mixtures near the blades of each rotating impeller. © 2002 Society of Chemical Industry 相似文献
994.
Kazuhiro Ito Kouji Kishikawa Akihisa Watajima Keita Ikeue Masato Machida 《Catalysis communications》2007,8(12):2176-2180
Activities of Cs-loaded MnOx–CeO2 for combustion of model diesel soot (carbon black) and sorptive NO uptake have been studied. MnOx–CeO2 is a pseudo-solid solution having redox properties favorable for soot oxidation. The addition of Cs not only lowered the temperature of soot ignition (Ti), but also increased oxidative NOx adsorption to form nitrate on the surface. Soot ignition over Cs–MnOx–CeO2 was further promoted in a stream of NO/O2, presumably because nitrate on the surface plays a role of an oxidizing agent. Soot ignition started just before sharp desorption of NOx, suggesting that adsorbed nitrate species would directly interact with soot. 相似文献
995.
Tatsumi Ishihara Kazuhiro Kometani Yukako Mizuhara Yusaku Takita 《Journal of the American Ceramic Society》1992,75(3):613-618
An oxide capacitor consisting of BaTiO3 and an oxide is studied as a new type CO2 sensor based on capacitance change. Sensitivity to CO2 , as well as the optimum operating temperature, was strongly dependent on the particular oxide mixed with BaTiO3 . Among the elements investigated in this study, CuO–BaTiO3 exhibited the highest sensitivity to CO2 . In particular, the CuO–BaTiO3 mixed oxide at the equimolar composition is highly sensitive to CO2 . The optimum operating temperature and frequency for CuO–BaTiO3 are 729 K and 100 Hz, respectively, and the 80% response time to 2% CO2 is within 25 s. The equimolar mixture of CuO and BaTiO3 can measure the CO2 concentration from 100 to 60 000 ppm. Carbonation of oxide seems to play a key role for the detection of CO2 on these mixed oxide capacitors. The optimum operating temperature of these mixed oxide capacitors for CO2 detection, therefore, correlates with the decomposition temperature of the carbonate corresponding to the oxide mixed with BaTiO3 . The capacitance increase of CuO–BaTiO3 upon exposure to CO2 seems to result from the elevated height of the potential barrier at the grain boundary between CuO and BaTiO3 . Carbonation of CuO in the element seems to bring about the elevation in the height of the potential barrier. 相似文献
996.
Optimization of reaction conditions for the production of DAG using immobilized 1,3-regiospecific lipase lipozyme RM IM 总被引:9,自引:3,他引:9
Takaaki?WatanabeEmail author Masao?Shimizu Masakatsu?Sugiura Manabu?Sato Jun?Kohori Naoto?Yamada Kazuhiro?Nakanishi 《Journal of the American Oil Chemists' Society》2003,80(12):1201-1207
Oils with a high DAG (1,3-DAG) content have attracted considerable attention as a healthful food oil component. In this study,
we report on the synthesis of 1,3-DAG from a mixture of FA, constituted largely of oleic and linoleic acids, using an immobilized
1,3-regioselective lipase from Rhizomucor miehei in a solvent-free system. The kinetics of 1,3-DAG production from FA and glycerol were investigated on the basis of a simplified
model, taking into consideration the acyl migration reaction, the removal of water, and glycerol dissolution in the oil phase
in addition to the esterification reactions. Both the yield of 1,3-DAG and the purity of DAG were evaluated under a variety
of experimental conditions, including reaction temperature, pressure, and amount of enzyme present. When either the reaction
temperature or the amount of enzyme used was increased, the 1,3-DAG production rate increased, but yield remained relatively
constant. The 1,3-DAG yield as well as the purity of DAG gradually decreased because of the enhancement of acyl migration
at later stages of the reaction after the 1,3-DAG concentration reached a maximum. Vacuum was important for attaining high
yields of 1,3-DAG. Under conditions of a high vacuum (1 mm Hg) at 50°C, 1.09 M 1,3-DAG was produced from 1.29 M glycerol and
2.59 MFA in an 84% yield and in 90% purity. 相似文献
997.
Gas hold-up and volumetric oxygen transfer coefficient were studied in a gas-liquid contactor without baffles, containing multiple impellers with four delta-type blades. The blades of each adjacent impeller were offset by 45° in an alternating manner. The direction of rotation of the impellers periodically was reversed. This new type of agitated gas-liquid contactor was denoted as “AJITER”. The effects of the gas sparging rate, the forward-reverse agitation rate and the number of impellers on the gas hold-up and volumetric oxygen transfer coefficient in the AJITER when different types of gas spargers were used were evaluated experimentally for an air-water system. Empirical relationships are presented to predict the gas hold-up and volumetric oxygen transfer coefficient. The differences in performance between the AJITER and existing types of gas-liquid contactors are discussed in terms of the differences in the gas hold-up and volumetric oxygen transfer coefficient due to changes in the superficial gas velocity. 相似文献
998.
Dowon Seo Kazuhiro Ogawa Tetsuo Shoji Shozo Murata 《Journal of Thermal Spray Technology》2007,16(5-6):954-966
The effect of particle size distribution on the degradation behavior of plasma sprayed CoNi- and CoCrAlY coatings during isothermal
oxidation was investigated, in terms of the oxygen content, porosity, surface roughness, and oxide scale formation. The results
show that the degradation of both coatings was considerably influenced by the starting particle size distribution. It also
shows that in the as-sprayed vacuum plasma spray (VPS) coatings the oxygen content on the coating surface increased significantly
with decreased average particle size. But after thermal exposure, the difference of the oxygen contents between the coatings
with different particle size was decreased. The powder with various particle size resulted in low porosity inside the coatings
during the deposition process. The surface roughness of the coatings increased with increased particle size. The small particles
produced a relatively smooth surface, and the oxide growth in the coating deposited by small particle was slower than that
in the large particle coating.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
999.
Realistic Animation of Fluid with Splash and Foam 总被引:6,自引:0,他引:6
Tsunemi Takahashi† Hiroko Fujii† Atsushi Kunimatsu† Kazuhiro Hiwada† Takahiro Saito† Ken Tanaka† Heihachi Ueki‡ 《Computer Graphics Forum》2003,22(3):391-400
In this paper we describe a method for modeling and rendering dynamic behavior of fluids withsplashes and foam. A particle system is built into a fluid simulation system to represent an ocean wavecresting and spraying over another object. We use the Cubic Interpolated Propagation (CIP) method asthe fluid solver. The CIP method can solve liquid and gas together in the framework of fluid dynamicsand has high accuracy in the case of relatively coarse grids. This enables us to simulate the fluids in ashort time and describe the motion of splashes in the air that is associated with the liquid motion well.The foam floating on the water also can be described using the particle system. We integrate the rigidbody simulation with the fluid and particle system to create sophisticated scenes including splashes andfoam. We construct state change rules that are used with the particle system. This controls the generation,vanishing and transition rule of splashes and foam. The transition rule makes the seamless connection betweena splash and foam. We employed a fast volume rendering method with scattering effect for particles.One of the important features of our method is the combination of fast simulation and rendering techniques,which provides dynamic and realistic scenes in a short time. 相似文献
1000.
Jun Ogawa Kazuhiro Agata Mikio Sakamoto Kunihiko Urano Takayuki Matsumoto 《Journal of the Society for Information Display》2005,13(2):111-116
Abstract— We have developed a new front projector with a super‐short projection distance of 0.65 m at 100 in. We installed a newly developed reflective‐type projection optical system in this projector, which was composed of only four aspheric mirrors that were free of color aberrations. Using this new system and a single‐chip DMD?, we projected a picture that had excellent sharpness and high contrast from 40 to 100 in. This paper describes the principles, design, and characteristics of the new WT600? front projector. 相似文献