全文获取类型
收费全文 | 1005篇 |
免费 | 13篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 55篇 |
综合类 | 1篇 |
化学工业 | 216篇 |
金属工艺 | 21篇 |
机械仪表 | 13篇 |
建筑科学 | 15篇 |
矿业工程 | 2篇 |
能源动力 | 17篇 |
轻工业 | 98篇 |
水利工程 | 2篇 |
石油天然气 | 1篇 |
无线电 | 119篇 |
一般工业技术 | 111篇 |
冶金工业 | 246篇 |
原子能技术 | 32篇 |
自动化技术 | 70篇 |
出版年
2021年 | 10篇 |
2018年 | 16篇 |
2017年 | 7篇 |
2016年 | 12篇 |
2014年 | 7篇 |
2013年 | 40篇 |
2012年 | 27篇 |
2011年 | 32篇 |
2010年 | 28篇 |
2009年 | 21篇 |
2008年 | 25篇 |
2007年 | 30篇 |
2006年 | 37篇 |
2005年 | 28篇 |
2004年 | 23篇 |
2003年 | 22篇 |
2002年 | 17篇 |
2001年 | 23篇 |
2000年 | 19篇 |
1999年 | 22篇 |
1998年 | 95篇 |
1997年 | 52篇 |
1996年 | 30篇 |
1995年 | 30篇 |
1994年 | 30篇 |
1993年 | 32篇 |
1992年 | 17篇 |
1991年 | 9篇 |
1990年 | 10篇 |
1989年 | 14篇 |
1988年 | 13篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1985年 | 11篇 |
1983年 | 8篇 |
1982年 | 10篇 |
1980年 | 8篇 |
1979年 | 8篇 |
1978年 | 6篇 |
1977年 | 9篇 |
1976年 | 13篇 |
1974年 | 6篇 |
1972年 | 15篇 |
1971年 | 12篇 |
1961年 | 12篇 |
1960年 | 11篇 |
1959年 | 11篇 |
1958年 | 12篇 |
1957年 | 13篇 |
1955年 | 10篇 |
排序方式: 共有1019条查询结果,搜索用时 15 毫秒
11.
M. Kamoshida F. Kawamura A. Sasahira T. Fukasawa T. Sawa J. Yamashita 《Progress in Nuclear Energy》2000,37(1-4):145-150
Hybrid Recycle System (HRS) is proposed as an advanced recycle system. The HRS consists of improved fluoride volatility reprocessing and vibration packing MOX fuel fabrication processing. For the former, a part of U is volatilized as hexafluoride with diluted F2 gas, and then residual U and Pu are volatilized with concentrated F2 gas. Plutonium content of the mixed fluoride gas can be adjusted as desired by controlling the U fluorination reaction in the first step. The U is highly decontaminated and the mixture gas of UF6 and PuF6 is not purified. The fluoride mixture is reacted with H2O and H2 and directly converted to the mixed oxide grain for the vibration packing. The HRS can reduce the costs of reprocessing and fuel fabrication, the amounts of radioactive wastes and the probability of Pu proliferation. 相似文献
12.
R. A. Reiners N. E. Bednarcyk J. E. Covey J. C. Harris Yoshio Hirano S. Kawamura D. A. Leo F. A. Kummerow E. G. Perkins 《Journal of the American Oil Chemists' Society》1947,24(12):505A-426
Journal of the American Oil Chemists' Society - 相似文献
13.
Tatsuyuki Kawamura Tomohiro Fukuhara Hideaki Takeda Yasuyuki Kono Masatsugu Kidode 《Personal and Ubiquitous Computing》2007,11(4):287-298
In this paper we propose an object-triggered human memory augmentation system named “Ubiquitous Memories” that enables a user
to directly associate his/her experience data with physical objects by using a “touching” operation. A user conceptually encloses
his/her experiences gathered through sense organs into physical objects by simply touching an object. The user can also disclose
and re-experience for himself/herself the experiences accumulated in an object by the same operation. We implemented a prototype
system composed basically of a radio frequency identification (RFID) device. Physical objects are also attached to RFID tags.
We conducted two experiments. The first experiment confirms a succession of the “encoding specificity principle,” which is
well known in the research field of psychology, to the Ubiquitous Memories system. The second experiment aims at a clarification
of the system’s characteristics by comparing the system with other memory externalization strategies. The results show the
Ubiquitous Memories system is effective for supporting memorization and recollection of contextual events. 相似文献
14.
Toshihiko Takaya Hidenori Kawamura Yoshihiro Minagawa Masahito Yamamoto Azuma Ohuchi 《Artificial Life and Robotics》2006,10(2):177-184
Blimp robots are attractive as indoor flying robots because they can float in the air, land safely with low energy, and stay
in motion for a long time compared with other flying robots. However, controlling blimp robots is difficult because they have
nonlinear characteristics, are influenced by air streams, and can easily be influenced by inertia. Therefore, a robust and
adaptive control system is needed for blimp robots. The applied research that has studied the features of indoor flying robots
in recent years has prospered. Operating an indoor blimp robot for a long time is difficult because the payload is small,
multiple batteries cannot be stacked, and the design of a thruster that gives freedom to the entire blimp robot is difficult.
Therefore, an autonomous charge that allows operation for a long time is needed. We have developed a method of landing with
orbital control of the charge point that gives autonomy to a blimp robot. The possibility of landing with orbital control
is shown.
This work was presented in part at the 10th International Symposium on Artificial Life and Robotics, Oita, Japan, February
4–6, 2005
An erratum to this article is available at . 相似文献
15.
Kawamura Y Kawasaki C Mine S Mutsuga M Tanamoto K 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2006,47(2):51-57
Levels of eight harmful elements, i.e., antimony, arsenic, barium, cadmium, chromium, lead, mercury and selenium, were investigated in 45 baby toys and 10 paints, which were mainly made of polyvinyl chloride. All samples contained barium at levels of 0.3-3,700 mg/kg, several samples contained cadmium (0.2-26 mg/kg), chromium (0.5-280 mg/kg) and lead (1.5-1,300 mg/kg), and one sample contained antimony (5.3 mg/kg). They might have been used as colorants of the toy materials and paints. They were then evaluated using the migration test of ISO 8124-3, in which samples were ground up, and then soaked in 0.07 mol/L HCl at 37 degrees C for two hours. Barium, cadmium, chromium and lead migrated from some of the samples, but at levels lower than the migration limits required by ISO 8124-3. Compared with the Japanese official method, the ISO method resulted in higher migration, but there are significant differences in the migration limits, test method, and so on between them. Further investigation is needed in this area. 相似文献
16.
Molecular, seasonal, and spatial distributions of organic aerosols from fourteen Chinese cities 总被引:7,自引:0,他引:7
Organic aerosols were studied at the molecular level in 14 coastal and inland mega-cities in China during winter and summer 2003. They are characterized by the abundant presence of n-alkanes (annual average, 340 ng m(-3)), fatty acids (769 ng m(-3)), sugars (412 ng m(-3)), and phthalates (387 ng m(-3)). In contrast, fatty alcohols, polyols/polyacids, lignin and resin products, sterols, polycyclic aromatic hydrocarbons (PAHs), and hopanes were detected as relatively minor components. n-Alkanes show a weak odd/even carbon predominance (CPI = 1.1) and PAHs show a predominance of benzo(b)fluoranthene, suggesting a serious contribution from fossil fuel (mainly coal) combustion. Their concentrations (except for phthalates and polyols/polyacids) were 2-15 times higher in winter than summer due to a significant usage of coal burning and an enhancement of atmospheric inversion layers. Phthalates were found to be more abundant in summer than winter, probably due to enhanced vaporization from plastics followed by adsorptive deposition on the pre-existing particles. Concentrations of total quantified compounds are extremely high (approximately 10 microg m(-3)) in the midwest (Chongqing and Xi'an) where active industrialization/urbanization is going on. This study shows that concentrations of the compounds detected are 1-3 orders of magnitude higher than those reported from developed countries. 相似文献
17.
Hidemitsu Hojo Wataru Toyoshima Masayasu Tamura Noriyuki Kawamura 《Polymer Engineering and Science》1974,14(9):604-609
Particulate-filled thermosetting composites are widely used, yet little systematic work has been done on their long-term strength characteristics. In this study short-term tensile, flexural, and impact tests as well as tensile creep-rupture tests were made for unfilled and filled epoxy to clarify the effects of filler size, filler content, and temperature. Fillers used were silica, alumina particles, and glass beads. Test temperatures were varied from 25 to 110°C. As a result of short-term testing, it was found that the Petch relation held between strength and filler size if brittle fracture occurred, while a strength and filler size if brittle fracture occurred, while a strengthening effect existed when ductile fracture occurred. On creeprupture testing, a strengthening is observed with filler size and content for silica and glass beads. The Arrhenius plot of rupture time for various filler sizes and contents converges to a characteristic point corresponding to the glass transition temperature of the material. Using this relation, a modified Larson-Miller master rupture curve is proposed which can predict the long-term strength of particulate-filled thermosetting composites as functions of rupture time, temperature, filler size, and content. 相似文献
18.
Lysine‐241 Has a Role in Coupling 2OG Turnover with Substrate Oxidation During KDM4‐Catalysed Histone Demethylation 下载免费PDF全文
Dr. Rebecca L. Hancock Dr. Martine I. Abboud Dr. Tristan J. Smart Dr. Emily Flashman Dr. Akane Kawamura Prof. Christopher J. Schofield Dr. Richard J. Hopkinson 《Chembiochem : a European journal of chemical biology》2018,19(9):917-921
The JmjC histone lysyl demethylases (KDMs) play important roles in modulating histone methylation states and have the potential to be regulated by oxygen availability. Lys241 of the KDM4 subfamily is proposed to be important in oxygen binding by KDM4A. We report evidence that, although Lys241 is unlikely to be directly involved in oxygen binding, it has an important role in coupling 2‐oxoglutarate cosubstrate oxidation with lysine demethylase activity. The results suggest that compounds promoting the uncoupling of substrate oxidation are of interest as JmjC‐KDM inhibitors. 相似文献
19.
R. Baskaran S. Selvasekarapandian N. Kuwata Yoshiki Iwai J. Kawamura T. Hattori 《应用聚合物科学杂志》2008,110(4):1945-1954
The lithium‐ion conducting gel polymer electrolytes (GPE), PVAc‐DMF‐LiClO4 of various compositions have been prepared by solution casting technique. 1H NMR results reveal the existence of DMF in the gel polymer electrolytes at ambient temperature. Structure and surface morphology characterization have been studied by X‐ray diffraction analysis (XRD) and scanning electron microscopy (SEM) measurements. Thermal and conductivity behavior of polymer‐ and plasticizer‐salt complexes have been studied by differential scanning calorimetry (DSC), TG/DTA, and impedance spectroscopy results. XRD and SEM analyses indicate the amorphous nature of the gel polymer‐salt complex. DSC measurements show a decrease in Tg with the increase in DMF concentrations. The thermal stability of the PVAc : DMF : LiClO4 gel polymer electrolytes has been found to be in the range of (30–60°C). The dc conductivity of gel polymer electrolytes, obtained from impedance spectra, has been found to vary between 7.6 × 10?7 and 4.1 × 10?4 S cm?1 at 303 K depending on the concentration of DMF (10–20 wt %) in the polymer electrolytes. The temperature dependence of conductivity of the polymer electrolyte complexes appears to obey the VTF behavior. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
20.
The heterogeneous phase transition of the organic vapours, cyclohexane and p-xylene, on a cold substrate was observed by cooling the substrate at a slow rate under reduced pressure conditions. Either organic vapour at a vapour pressure lower than 130 Pa formed directly solid crystals but p-xylene vapour at a higher vapour pressure formed liquid condensates with subsequent formation of solid crystals. The dependence of the critical supersaturation ratios on the critical temperatures and the physical properties of the organic vapours has been clarified by the equation derived on the basis of classical nucleation theory. 相似文献