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51.
T Yoshinaga T Shirakata H Dohtsu H Hiratsuka M Hasegawa M Kobayashi T Hoshi 《Analytical sciences》2001,17(2):333-337
Iodometry is one of the easiest, most rapid and accurate methods for the determination of a relatively small amount of oxidizing agent, such as residual chlorine. Starch has long been used as a useful color indicator in iodometry. However, we found that PVA (polyvinyl alcohol with partially saponificated; e.g., saponification degree of 88%) is a more useful color indicator than starch. For example, at 20 degrees C, the PVA indicator gave similar profiles of iodine concentration vs. titration efficiencies (percent recoveries) to those of starch at 0 degrees C. At 0 degrees C, the PVA indicator detected 1.1 mg I2/L (11 microg I2: with 10 mL sample volume) with a high percentage of recovery (=95%). Furthermore, at 20 degrees C an iodine concentration of 0.36 mg/L (which corresponds to a residual chlorine concentration of 0.1 mg Cl2/L) could be detected using PVA color indicator assuming an appropriate correction. 相似文献
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Ohne Zusammenfassung 相似文献
55.
用新局域模型计算高Z靶的溅射产额 总被引:1,自引:0,他引:1
用ACAT模拟程序计算了不同离子碰撞在单原子材料上的溅射产额。计算中采用山村等人提出的包括壳效应的新电子能量损失局域模型 ,原子间作用势使用Moli啨re势?扑愕玫降慕峁胧笛槭莺蜕酱宓鹊木楣浇斜冉?,符合得很好 相似文献
56.
Nagaaki Ohyama Masahiro Yamaguchi Jumpei Tsujiuchi Toshio Honda Seiichiro Hiratsuka 《Optics Communications》1986,60(6):364-368
When a halftone screened image is discretely sampled by, for example, a CCD array, moiré fringes sometimes appear. These moiré fringes are caused by aliasing errors due to the improper sampling rate. To suppress these fringes, a dual sampling method is proposed. In this method, halftone screened images are sampled twice with different sampling rates, and the selection of proper frequency components less suffering from aliasing errors can effectively suppress moiré fringes. 相似文献
57.
We developed an integrated array of needle-type biosensors employing a novel process of fabrication, comprising conventional semiconductor fabrication and micromachining technology. Amperometric sensing electrodes with plasma-polymerized films and a thin-film Ag/AgCl reference electrode were directly integrated on a glass substrate with thin-film process, e.g., sputtering. An enzyme was immobilized on the electrode via the plasma-polymerized film, which was deposited directly on the substrate using a dry process. The novel thin-film Ag/AgCl reference electrode showed stable potentials in concentrated chloride solutions for a long period. The plasma-polymerized film is considered to play an important role as an interfacial design between the sensing electrode and the immobilized enzyme considering that the film is extremely thin, adheres well to the substrate (electrode) and has a highly cross-linked network structure and functional groups, such as amino groups. The results showed increments of the sensor signal, probably because the plasma-polymerized film allowed a large amount of enzyme to be immobilized. The greatest advantage is that the process can permit the mass production of high-quality biosensors at a low cost. 相似文献
58.
Kazutoshi Shindo Kanae Mikami Shinichi Takaichi Norihiko Misawa 《Tetrahedron letters》2007,48(15):2725-2727
A novel acyl glyco-carotenoic acid, diapolycopenedioic acid xylosyl ester, was isolated from a marine bacterium Rubritalea squalenifaciens belonging to subdivision 1 of Verrucomicrobia as the major red pigment by using chromatographic methods. The structure of diapolycopenedioic acid xylosyl ester was determined to be 4-[2-O-(12-methyltridecanoyl)-β-xylopyranosyl] hydrogen 4,4′-diapo-ψ,ψ-carotene-4,4′-dioate by analysis of the MS and NMR data for this acid and for the diacetyl diapolycopenedioic acid xylosyl ester. The diapolycopenedioic acid xylosyl ester showed potent antioxidative activity against a lipid peroxidation model. 相似文献
59.
New data on the physical properties of Y3Al5O12-based nanocrystalline laser ceramics 总被引:1,自引:0,他引:1
A. A. Kaminskii M. Sh. Akchurin V. I. Alshits K. Ueda K. Takaichi J. Lu T. Uematsu M. Musha A. Shirikawa V. Gabler H. J. Eichler H. Yagi T. Yanagitani S. N. Bagayev J. Fernandez R. Balda 《Crystallography Reports》2003,48(3):515-519
Microhardness and fracture toughness of highly transparent Y3Al5O12-and Y3Al5O12: Nd3+-based nanocrystalline ceramics are measured for the first time. For the Y3Al5O12: Nd3+ laser ceramics, the use of a longitudinal scheme with a diode-laser pumping at a wavelength of 1.3186 mm (4 F 3/2 → 4 I 13/2 channel) enabled one to attain an output power of continuous-wave lasing of ~3.7 W with 35% efficiency. 相似文献
60.
Shinichi Takaichi 《Journal of mass spectrometry : JMS》1993,28(7):785-788
Field desorption (FD) mass spectrometry was applied to the determination of the molecular masses of carotenoids, natural carotenoid derivatives and their chemical derivatives. All the carotenoids examined gave the molecular ion as the base peak with negligible fragment ions. Carotenoid glucoside and its fatty acid monoester were successfully determined without acetylation, whereas carotenoic acids (carboxylate and sulphate) needed to be converted into methyl esters prior to analysis. The applicable ranges of molecular masses and polarity were very wide. In addition, carotenoid glycoside gave only [M]+˙ without [M + H]+˙ and [M + cation]+˙. The numbers of carbonyl groups, primary and/or secondary hydroxyl groups and total hydroxyl groups could be directly determined according to the increase in mass units of the carotenoids after chemical reduction, acetylation and trimethylsilylation, respectively. Owing to the negligible fragment ions, FD analysis was also suitable for carotenoids containing small amounts of impurities or other carotenoids. Hence this technique is useful for determining the molecular masses of carotenoids and the number of modifiable groups in carotenoids. 相似文献