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Masahiko Motegi Masahiko Moritani Hiromichi Kawai 《Journal of Polymer Science.Polymer Physics》1970,8(4):499-512
Light scattering from oriented samples of crystalline polymers is affected by the birefringence of the sample. An extension of the theory for scattering from uniaxially deformed two-dimensional and three-dimensional spherulites is made so as to include the retardation of the incident and scattered beams in passing through the birefringent sample. Strain influences scattering, in that it changes the birefringence of the sample and it also changes the anisotropy and shape of the spherulites. Scattering intensities are calculated for both crossed and parallel polarizers as a function of Ω, χ, and Φ, where Ω is the angle between the stretching direction of the sample and the horizontal direction, and χ and Φ are the angles between the stretching direction and the polarization directions of the polarizer and analyzer, respectively. It is shown that for crossed polarizers with Φ = 45° and χ = 45° birefringence changes largely influence the results but that for the polarizers parallel at Φ = 0° and χ = 0° or crossed at Φ = 90° and χ = 0° the birefringence effect is minimized. The intensity distributions for crossed polarizers at Φ = 45° and χ = 45° from polyethylene films stretched to give retardations up to several wavelengths, are found to be in good agreement with the calculated results. 相似文献
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Nagasawa Kazuki Yoshii Junki Yamamoto Shoji Arai Wataru Kaneko Satoshi Hirai Keita Tsumura Norimichi 《Optical Review》2021,28(4):449-461
Optical Review - We propose a layout estimation method for multi-layered ink using a measurement of the line spread function (LSF) and machine learning. The three-dimensional printing market for... 相似文献
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Junki Ochi Prof. Dr. Kazuo Tanaka Prof. Dr. Yoshiki Chujo 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2023,135(2):e202214397
Herein, we report the unique solid-state excimer emission of three types of acridine-tethered o-carboranes with variable degrees of methylation at the o-carborane unit. They all showed columnar packing structures based on dimer formation, and two types of π-overlapping motifs were alternately stacked. From the photoluminescence (PL) measurements on the crystalline samples, it was found that three types of luminescence bands can simultaneously appear: monomer emission, excimer emission from the moderately π-stacked intra-dimer unit, and excimer emission from the widely π-stacked inter-dimer unit. Consequently, the PL colors were drastically changed by the steric effect of the methyl groups, with a strong correlation found between the π-overlapping and excimer character. In addition, variable-temperature PL measurements revealed that these PL species should be in thermal equilibrium at room temperature, with the intensity ratios sensitive toward temperature changes. 相似文献
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Three kinds of modulation techniques, electroreflectance, thermoreflectance and piezo-reflectance are employed to determine energy band parameters in HgTe in the range of photon energy 0.5 to 4 eV. The value of the spin-orbit splitting Δ0 is determined to be 1.08 ± 0.02 eV from the measurement of electroreflectance with the use of the electrolyte technique and is assigned with the help of electroreflectance measurement on CdxHg1?xTe alloys. In thermoreflectance and piezoreflectance near E1, various information is obtained, such as broadening parameters, the energy gaps, the location of the transition edge and the ratios of deformation potential constants D15/D11 = ? 1.4 ± 0.5 and D35/D33= 2.3 ± 0.8 at room temperature. 相似文献
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C Moritani Y Sakai M Tsuda H Kanazawa T Tsuchiya 《Chemical & pharmaceutical bulletin》1990,38(1):164-167
We have characterized H(+)-translocating adenosine triphosphatase (ATPase) in membrane vesicles of Vibrio parahaemolyticus. The ATPase required high concentrations (about 0.5 M) of Na2SO4 (or other salts) for its maximum activity. Magnesium ion stimulated the ATPase activity, but Ca2+ did not. The activity of ATPase was inhibited by tetrachlorosalicylanilide, an H+ conductor, but not by another H+ conductor, carbonylcyanide-m-chlorophenylhydrazone. The activity was strongly inhibited by dicyclohexylcarbodiimide or Zn2+, and partially inhibited by azide, but not at all by vanadate. 相似文献
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The time‐dependent emission enhancement (TDEE) phenomena of the 1‐(o‐carboran‐1‐yl)ethynylpyrene dyad were reported. It was found that the emission intensity from the dyad increased in tetrahydrofuran (THF), acetone and dichloromethane with increasing incubation time. From the mechanistic studies, it was suggested that agglomeration of the dyad gradually proceeded in these media, followed by expression of excimer luminescence. Additionally, it was shown that the rates of TDEE of the dyad were sensitively accelerated in the presence of a trace amount of water. Based on this fact, a detection system for water contents in acetone was constructed. Before and after incubation for 96 h at room temperature, time courses of changes in optical properties were monitored. Finally, water contents in acetone can be estimated by the degrees of TDEE and emission color changes in the range from 0.1 wt % to 2.0 wt % and from 2.0 wt % to 20 wt %, respectively. 相似文献
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