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排序方式: 共有111条查询结果,搜索用时 16 毫秒
91.
92.
K Imanaka K Sugimoto Y Obayashi K Tada T Sakurai H Iwasaki 《Canadian Metallurgical Quarterly》1998,16(2):153-156
Several evidences support the hypothesis that central catecholamines may play a significant role in the production and/or maintenance of different alterations that characterize portal hypertension. The aim of the present work was to study the possible modifications in norepinephrine (NE) metabolism in several telencephalic and diencephalic areas rich in NE in experimental prehepatic portal hypertension. NE uptake was studied as an index of NE metabolism. The experiments were carried out in vitro in encephalic areas and nuclei, obtained according to the punch-out technique. Results indicated that portal hypertensive rats showed an enhancement of NE uptake in olfactory bulb (OB), preoptic area (PA), and supraoptic, periventricular, paraventricular, and arcuate nuclei (SON, PeVN, PaVN, and AN, respectively) compared to sham-operated rats. However, no modifications on NE uptake was observed in the median eminence (ME). Present results suggest that the changes observed in central NE uptake may be related to the development and/or maintenance of the portal hypertensive state. 相似文献
93.
Masanao Itakura Keisuke Sato Marina A. Lusenkova Shigetomo Matsuyama Kayori Shimada Takeshi Saito Shinichi Kinugasa 《应用聚合物科学杂志》2004,94(3):1101-1106
Molecular weight dependency of a specific UV absorption coefficient of polystyrene in solution was determined by supercritical fluid chromatography applied to equimolar and equimass mixtures of uniform polystyrenes whose degree of polymerization was n = 1 to 40. From the ratio between the response from a UV detector and that from a refractometer, we determined the refractive index increment dn/dc as a function of molecular weight for polystyrene in tetrahydrofuran at the wavelength λ = 633 nm. We found that dn/dc is well expressed as a linear function of the reciprocal of molecular weight for uniform polystyrenes. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 1101–1106, 2004 相似文献
94.
Hiroyuki Oigawa Kazufumi Tsujimoto Kenji Nishihara Takanori Sugawara Yuji Kurata Hayanori Takei Shigeru Saito Toshinobu Sasa Hironari Obayashi 《Journal of Nuclear Materials》2011,415(3):229-236
Reduction of burden caused by radioactive waste management is one of the most critical issues for the sustainable utilization of nuclear power. The Partitioning and Transmutation (P&T) technology provides the possibility to reduce the amount of the radiotoxic inventory of the high-level radioactive waste (HLW) dramatically and to extend the repository capacity. The accelerator-driven system (ADS) is regarded as a powerful tool to effectively transmute minor actinides (MAs) in the “double-strata” fuel cycle strategy. The ADS has a potential to flexibly manage MA in the transient phase from light water reactors (LWRs) to fast breeder reactors (FBRs), and can co-exist with FBR symbiotically and complementarily to enhance the reliability and the safety of the commercial FBR cycle. The concept of ADS in JAEA is a lead-bismuth eutectic (LBE) cooled, tank-type subcritical reactor with the power of 800 MWth driven by a 30 MW superconducting LINAC. By such an ADS, 250 kg of MA can be transmuted annually, which corresponds to the amount of MA produced in 10 units of LWR with 1 GWe. The design study was performed mainly for the subcritical reactor and the spallation target with a beam window. In Japan, Atomic Energy Commission (AEC) has implemented the check and review (C&R) on P&T technology from 2008 to 2009. In the C&R, the benefit of P&T technology, the current status of the R&D, and the way forward to promote it were discussed. 相似文献
95.
Tae-Hyung Cho Masanao Tanaka Yuka Kondo Tatsuo Nakamura 《Journal of power sources》2010,195(13):4272-241
A new type composite nonwoven separator has been developed by combining a polyacrylonitrile (PAN) nano-fiber nonwoven and ceramic containing polyolefin nonwoven. The physical, electrochemical and thermal properties of the separator were investigated. The separator has mean pore size of about 0.8 μm as well as narrow pore-size distribution. Besides, the separator possesses higher porosity and air permeability than a conventional microporous membrane separator. The separator showed tensile strength of 46 N 5 cm−1 at 10% elongation. Any internal short circuit was not observed for cells with the separator during charge-discharge test, and the cells showed stable cycling performance. Moreover, the cells showed better rate capabilities than cells with the conventional one. On a hot oven test at 150 °C, the composite nonwoven separator showed better thermal stability than the conventional one. In addition, internal short circuit by thermal shrinkage of separator was not observed for a cell with the separator at 150 °C for 1 h. 相似文献
96.
Hironari Obayashi Yuji Tasaka Seiji Kon Yasushi Takeda 《Flow Measurement and Instrumentation》2008,19(3-4):189-195
This paper proposes a new technique that enables the measurement of the velocity vector in multi-dimensions on a line of the flow field. A system to achieve this goal was developed based on the ultrasonic velocity profiling by using multiple transducers. A two-dimensional system was constructed and successfully applied to an actual flow field for two-dimensional velocity vector measurements. To estimate the influence of the existence of a wall, acoustic field under the developed system was calculated by solving two-dimensional wave equation and then the focal point of an ultrasonic beam was determined to optimize the system. The system was applied to measure the two-directional velocity components of a periodic velocity fluctuation in the wake of a cylinder as an example of unsteady flow. Temporal variation of velocity vector profiles well represent the velocity fluctuation, and vorticity distribution, which is obtained from the spatial distribution of velocity vector, well represents the vertical motion in the wake. 相似文献
97.
Kun'ichi Miyazawa Akio Obayashi Makoto Kuwabara 《Journal of the American Ceramic Society》2001,84(12):3037-3039
Fine fibrous structures of C60 with a diameter on the order of nanometers were discovered in a lead zirconate titanate sol ultrasonically mixed with a toluene solution of C60 . By transmission electron microscopy observations, they were identified as single-crystalline fibers of C60 with submicrometer diameters, i.e., nanowhiskers of C60 . The C60 nanowhiskers showed thin slablike TEM images, and the growth axis of the nanowhiskers was parallel to the 〈110〉 close-packed direction of a fcc crystal system of C60 . 相似文献
98.
M Fukui K Nakano H Obayashi Y Kitagawa N Nakamura H Mori S Kajiyama S Wada M Fujii K Yoshimori T Kanaitsuka H Shigeta M Kondo 《Canadian Metallurgical Quarterly》1997,46(7):793-795
To identify diabetes mellitus caused by the mitochondrial gene substitution at genomic nucleotide pair 3243 (M3243A-->G) we selected 87 diabetic patients with high risk factors such as maternal inheritance and hearing loss. Total DNA was extracted from peripheral leukocytes, and mitochondrial DNA fragments containing M3243A-->G were amplified by polymerase chain reaction (PCR). The amplified fragments were digested with a restriction endonuclease Apa1 and analyzed by agarose gel electrophoresis. The incidence of the M3243A-->G mutation was 4.6% (four of 87) in diabetic patients with maternal inheritance and/or hearing loss. In a subgroup with both maternal inheritance and hearing loss, the incidence of the mutation was as high as 21.4% (three of 14). Cardiac disorders were also present in all four diabetic patients with the mutation. This study suggests that maternal inheritance and hearing loss are useful clinical findings to identify diabetic patients with the mutation, and that cardiac involvement is a high risk factor for the M3243A-->G mutation. 相似文献
99.
A reinforcement learning method based on an immune network adapted to a semi-Markov decision process
Nagahisa Kogawa Masanao Obayashi Kunikazu Kobayashi Takashi Kuremoto 《Artificial Life and Robotics》2009,13(2):538-542
The immune system is attracting attention as a new biological information processing-type paradigm. It is a large-scale system
equipped with a complicated biological defense function. It has functions of memory and learning that use interactions such
as stimulus and suppression between immune cells. In this article, we propose and construct a reinforcement learning method
based on an immune network adapted to a semi-Markov decision process (SMDP). We show that the proposed method is capable of
dealing with a problem which is modeled as a SMDP environment through computer simulation.
This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January
31–February 2, 2008 相似文献
100.
Nanocomposites of poly(lactide) (PLA) and the PLA plasticized with diglycerine tetraacetate (PL‐710) and ethylene glycol oligomer containing organo‐modified montmorillonites (ODA‐M and PGS‐M) by the protonated ammonium cations of octadecylamine and poly(ethylene glycol) stearylamine were prepared by melt intercalation method. In the X‐ray diffraction analysis, the PLA/ODA‐M and plasticized PLA/ODA‐M composites showed a clear enlargement of the difference of interlayer spacing between the composite and clay itself, indicating the formation of intercalated nanocomposite. However, a little enlargement of the interlayer spacing was observed for the PLA/PGS‐M and plasticized PLA/PGS‐M composites. From morphological studies using transmission electron microscopy, a finer dispersion of clay was observed for PLA/ODA‐M composite than PLA/PGS‐M composite and all the composites using the plasticized PLA. The PLA and PLA/PL‐710 composites containing ODA‐M showed a higher tensile strength and modulus than the corresponding composites with PGS‐M. The PLA/PL‐710 (10 wt %) composite containing ODA‐M showed considerably higher elongation at break than the pristine plasticized PLA, and had a comparable tensile modulus to pure PLA. The glass transition temperature (Tg) of the composites decreased with increasing plasticizer. The addition of the clays did not cause a significant increase of Tg. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006 相似文献