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排序方式: 共有172条查询结果,搜索用时 15 毫秒
61.
Masayuki Nakahata 《Brazilian Journal of Physics》2014,44(5):465-482
Papers related to neutrino physics, submitted in the categories NU-EX (experimental results), NU-IN (methods, techniques, and instrumentation) and NU-TH (theory, model, and simulations) are reviewed with a brief introduction on the current understanding of neutrino masses and mixings. 相似文献
62.
The image of spectral absorbance in human skin is analyzed by independent component analysis. The spectral absorbance image is estimated from an image with red, green, and blue channels. The qualitative information and spatial distribution of the pigments can be extracted by the independent component analysis. It is shown that the extracted absorption characteristics of the pigments are corresponding to those of hemoglobin and melanin. 相似文献
63.
A new artificial neural network that can reject strange patterns is presented. The new network is an improved version of the RCE network. Each cell in the last layer of the present network has two thresholds. The new threshold produces the smallest boundary that encloses all examples associated with the cell in the pattern vector space. The present network can reject strange patterns by using this boundary. The rejection of strange patterns in the present and RCE networks was investigated by practical experiments using digits sampled from X-ray films of the human chest. 相似文献
64.
Sterilization system using microwave and UV light 总被引:2,自引:0,他引:2
Shiro Iwaguch Kentaro Matsumura Yoshikazu Tokuoka Shiro Wakui Norimichi Kawashima 《Colloids and surfaces. B, Biointerfaces》2002,25(4):458-304
We constructed a novel microwave–UV light sterilization system and investigated its sterilization effect. This sterilization system can emit UV light by irradiation of microwave without other power. When irradiating UV light with and/or without microwave on aqueous DMPO solution, active oxygen species such as hydroxyl radical or superoxide were generated in the solution. The amount of active oxygen species generated by irradiation of microwave and UV light was larger than that by irradiation of UV light alone. This would be due to the promotion of emission of UV light photons by microwave and UV light irradiation. Moreover, microwave–UV light sterilization was highly effective to sterilize microorganisms. The generation of active oxygen species would play an important role in sterilization of the sterilization system. 相似文献
65.
Shinichi Takeuchi Toshio Sato Norimichi Kawashima 《Colloids and surfaces. B, Biointerfaces》2002,24(3-4):207-216
Nonlinear response of microbubbles illuminated with ultrasound pulse was investigated through experiments and numerical calculations to build the basis for ultrasound blood flow image enhancement system (harmonic imaging system) using higher harmonic components based on nonlinear behavior of microbubbles for ultrasound contrast agents. The effects of membrane coating, size distribution and randomness of spatial distribution of microbubbles were examined. The relationship between the number of cycles in illuminated pulse and the higher harmonic component excitation efficiency, in particular, was studied and a tendency was found for the number of cycles larger than six cycles to cause gradual increase in the second harmonic component excitation efficiency. The simulated and experimental results were in good agreement. Furthermore, the simulated results using the conventional mathematical model ignoring the compressibility of liquid around bubbles showed a tendency of variation opposite to that of experimental results in the relationship between the illuminated ultrasound frequency and the second harmonic component excitation efficiency. On the contrary, the simulated results taking account of compressibility showed a good agreement with the experimental results. 相似文献
66.
A new method for the measurement of trace amounts of HONO has been developed. Nitrous acid in the ambient air is absorbed in an aqueous solution by an air-dragged aqua-membrane-type denuder. The absorbed nitrite is reacted with 2,3-diaminonaphthalene, and the formed 1-naphthotriazol is measured using a fluorescence method. The calibration curve of HONO shows a straight line from 0 to 4000 ppt, and the detection limit is estimated to be 8.1 ppt calculated as being three times of the base line noise. The time resolution, which is defined as the time required to become a constant value by changing from 0 to ca. 1000 ppt was 2 min. The present method is not affected by NO(2), NO, SO(2), O(3) NH(3) or mixtures of these gases and organic nitrate, organic carboxylic acids, alcohols and aldehydes. The determination results of HONO concentrations in the ambient air by the present method are in good agreement with those by the annular denuder system and the differential optical absorption method. 相似文献
67.
Kiyoshi?NomuraEmail author Shigeyo?Suzuki Yuya?Koike Hongling?Li Atsushi?Okazawa Norimichi?Kojima 《Hyperfine Interactions》2016,237(1):26
The dilute magnetic properties of SrSn1?xFexO3 (x = 0.01 ? 0.15) prepared by sol-gel and thermal decomposition methods were investigated by 57Fe Mössbauer spectrometry, magnetometry, and X-ray diffractometry. It was found that SrSnO3 doped with 2–8 % Fe show weak ferromagnetism although only paramagnetic doublets are observed in 57Fe Mössbauer spectra at room temperature (RT), whereas SrSnO3 doped with 10–15 % Fe show relatively strong ferromagnetism, and the sextets are additionally observed in the 57Fe Mössbauer spectra at RT. The weak ferromagnetism by doping 2–8 % Fe is considered to be caused by the induced magnetic defects, and the ferromagnetism by doping 10–15 % Fe are considered mainly due to the magnetic coupling between dilute Fe 3+ partially substituted at Sn 4+ sites in the orthorhombic structure of SrSnO3?δ accompanying the oxygen deficiencies. It is further remarkable that poor crystalline 8 % Fe doped SrSnO3?δ obtained by annealing at 600 °C shows relatively high saturation magnetization and low coercivity. 相似文献
68.
69.
Misa Hirose Saori Toyota Nobutoshi Ojima Keiko Ogawa-Ochiai Norimichi Tsumura 《Optical Review》2017,24(4):517-528
In this paper, principal component analysis is applied to the distribution of pigmentation, surface reflectance, and landmarks in whole facial images to obtain feature values. The relationship between the obtained feature vectors and the age of the face is then estimated by multiple regression analysis so that facial images can be modulated for woman aged 10–70. In a previous study, we analyzed only the distribution of pigmentation, and the reproduced images appeared to be younger than the apparent age of the initial images. We believe that this happened because we did not modulate the facial structures and detailed surfaces, such as wrinkles. By considering landmarks and surface reflectance over the entire face, we were able to analyze the variation in the distributions of facial structures and fine asperity, and pigmentation. As a result, our method is able to appropriately modulate the appearance of a face so that it appears to be the correct age. 相似文献
70.
Optical Review - We evaluated the robustness of a method used to estimate five components (i.e., melanin, oxy-hemoglobin, deoxy-hemoglobin, shading, and surface reflectance) from the spectral... 相似文献