全文获取类型
收费全文 | 368篇 |
免费 | 10篇 |
国内免费 | 1篇 |
专业分类
化学 | 279篇 |
晶体学 | 4篇 |
力学 | 12篇 |
数学 | 14篇 |
物理学 | 70篇 |
出版年
2022年 | 3篇 |
2021年 | 2篇 |
2019年 | 7篇 |
2018年 | 3篇 |
2016年 | 6篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 20篇 |
2012年 | 21篇 |
2011年 | 14篇 |
2010年 | 13篇 |
2009年 | 12篇 |
2008年 | 20篇 |
2007年 | 26篇 |
2006年 | 25篇 |
2005年 | 30篇 |
2004年 | 17篇 |
2003年 | 18篇 |
2002年 | 10篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 9篇 |
1998年 | 10篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 7篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1980年 | 8篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1972年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有379条查询结果,搜索用时 254 毫秒
121.
122.
Amane Mochizuki Michie Sakamoto Masahiro Yoshioka Takahiro Fukuoka Kazumasa Takeshi Mitsuru Ueda 《Journal of polymer science. Part A, Polymer chemistry》2000,38(2):329-336
A novel photosensitive polymer based on end‐capped polycarbodiimide (E‐PCD) and the photoamine generator N‐{[(4,5‐dimethoxy‐2‐nitrobenzyl)oxy]carbonyl}‐2,6‐dimethylpiperidine (1) was developed. The E‐PCD was prepared by polycondensation of tolylene‐2,4‐diisocyanate in the presence of 3‐methy‐1‐phenyl‐2‐phospholene‐1‐oxide as a catalyst. The reaction of carbodiimide and secondary amine was studied. The nucleophilic addition of amine to the carbodiimide moiety proceeded smoothly and provided a guanidine base that acted as a crosslinking agent. A lithographic evaluation of the system of E‐PCD and 1 revealed that the dissolution rate of the exposed area after the postexposure bake decreased drastically, although no obvious change of the dissolution rate in the unexposed area was observed. The E‐PCD containing 10 wt % 1 functioned as a negative working photosensitive polymer when it was exposed to 365‐nm UV light, postbaked at 120 °C for 5 min, and developed with toluene at 25 °C. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 329–336, 2000 相似文献
123.
Akira Mochizuki Kazuhisa Senshu Yukio Seita Shuzo Yamashita Naoto Koshizaki 《Journal of polymer science. Part A, Polymer chemistry》2000,38(7):1045-1056
The surface structures of three kinds of poly(ethylene oxide)‐segmented nylon (PEO‐Ny) molten films were investigated using a scanning electron microscopy (SEM), an electron spectroscopy for a chemical analysis (ESCA), and a static secondary ion mass spectrometry (SSIMS). The PEO‐Ny's used were high semicrystalline PEO‐segmented poly(iminosebacoyliminohexamethylene) (PEO‐Ny610), low semicrystalline PEO‐segmented poly(iminosebacoylimino‐m‐xylene) (PEO‐NyM10), and amorphous PEO‐segmented poly(iminoisophthaloyliminomethylene‐1,3‐cyclohexylenemethylene) (PEO‐NyBI). SEM observations show that the surfaces of the PEO‐Ny610 and PEO‐NyM10 films are composed of spherulite, and that PEO‐NyBI film has a smooth surface. The results of ESCA and SSIMS exhibit the significant enrichments of PEO segment at the surfaces of all the films regardless of the crystallinity. The reason for the enrichment of PEO segment was discussed in terms of the surface tension of the corresponding homopolymers in the melting state. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 1045–1056, 2000 相似文献
124.
Using the Fourier series method, we generalize results characterizing the behavior of the integral logarithmic means of Blaschke products of arbitrary order for meromorphic functions.Translated fromMatematicheskie Zametki, Vol. 64, No. 2, pp. 199–206, August, 1998. 相似文献
125.
D. Li K. Imasaki M. Aoki S. Miyamota S. Amano T. Mochizuki M. Asakawa S. Ishii 《International Journal of Infrared and Millimeter Waves》2003,24(2):211-215
We are exploring to process nuclear waste through nuclear transmutation method with ray irradiation. The ray employed for transmutation is generated in the way of Compton backscattering. Preliminary experiment is being developed on the NewSUBARU storage ring providing an electron beam with energy of 1 GeV, and 17.6 MeV ray will be generated through a head-on collision of the electron beam and a 1.064 m laser light. ray flux about the present experiment is predicted theoretically. A planned scheme for promoting the flux is also introduced, As well as the maximum laser power available for the storage ring is discussed. 相似文献
126.
J Yamahara M Mochizuki T Chisaka H Fujimura Y Tamai 《Chemical & pharmaceutical bulletin》1990,38(4):1039-1044
The inhibitory effect of vexibinol, one of the flavanols found in Sophora, on gastric ulcers induced by HCl-ethanol has been reported previously. In the present study, the effect of vexibinol was examined in various experimental ulcer models in order to determine the mechanism of its antiulcer action. The results indicated that the oral administration of vexibinol at 25-50 mg/kg significantly inhibited the development of ulcers induced by HCl-ethanol, 0.6 N HCl 0.2 N NaOH, absolute ethanol and 1% NH3. In addition, an intraduodenal administration of vexibinol at 300 mg/kg significantly inhibited Shay's ulcer. Further, intraduodenal administration at 300 mg/kg significantly inhibited acid secretion caused by 2-deoxy-D-glucose. These results suggest that vexibinol has not only gastric mucosal protective action but also an inhibitory effect on the secretion of gastric acids. 相似文献
127.
N-Alkyl-N- (hydroxymethyl)nitrosamines, postulated intermediates in the metabolic activation of carcinogenic nitrosamines, were prepared by deoxygenation of the corresponding hydroperoxymethyl nitrosamines and characterized. 相似文献
128.
Nishida H Miyazaki Y Mukaihira T Saitoh F Fukui M Harada K Itoh M Muraoka A Matsusue T Okamoto A Hosaka Y Matsumoto M Ohnishi S Mochizuki H 《Chemical & pharmaceutical bulletin》2002,50(9):1187-1194
Intravascular clot formation is an important event in a number of cardiovascular diseases. The prevention of blood coagulation has become a major target for new therapeutic agents. Factor Xa (FXa) is a trypsin-like serine protease that plays a key role in the blood coagulation cascade and represents an attractive target for anticoagulant drug development. We have investigated substituents in the central part of a lead compound (3: M55113), and discovered that compound M55551 (34: (R)-4-[(6-Chloro-2-naphthalenyl)sulfonyl]-6-oxo-1-[[1-(4-pyridinyl)-4-piperidinyl]methyl]-2-piperazinecarboxylic acid) is a potent inhibitor of FXa (IC(50)=0.006 microM), with high selectivity for FXa over trypsin and thrombin. The activity of this compound is ten times more powerful than the lead compound. 相似文献
129.
Yasuhisa Kohara Keiji Kubo Eiko Imamiya Takehiko Naka 《Journal of heterocyclic chemistry》2000,37(6):1419-1423
The reaction of amidoximes 1 with 1,1′‐thiocarbonyldiimidazole (TCDI) followed by treatment with silica gel or boron trifluoride diethyl etherate (BF3·OEt2) provided 3‐substituted 4,5‐dihydro‐5‐oxo‐1,2,4‐thiadiazoles 2 in moderate yields. The Lewis acids are considered to promote the rearrangement of the thioxocarbamate intermediates 5 to the thiol carbarn ate intermediates 7 , which cyclize to afford 4,5‐dihydro‐5‐oxo‐1,2,4‐thiadiazoles 2 . 相似文献
130.
Fumiko Akagi Masaki MukohMasafumi Mochizuki Junko UshiyamaTakuya Matsumoto Harukazu Miyamoto 《Journal of magnetism and magnetic materials》2012,324(3):309-313
Thermally assisted magnetic recording (TAR) with bit-patterned media was investigated by micromagnetic simulation. The media were assumed to be FePt layers. The effective head-field margin as well as the increase in temperature margin and down-track shift margin was investigated. Conditions of the head and medium that lead to a recording density beyond 5 Tb/in2 were proposed. 相似文献