检索结果-内蒙古大学图书馆

Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： J. Abe T. Kuga T. Hirano M. Yamanishi Institute of Physics University of Tokyo Meguro Tokyo Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency Japan Department of Physics Gakushuin University Toshima Tokyo Japan Department of Physical Electronics Faculty of Engineering Hiroshima University Higashihiroshima Japan

The generation of photon-number squeezed states or sub-Poissonian light using semiconductor devices is especially attractive because of its simple experimental configuration, small energy consumption, and the possibility of large amplitude noise reduction by using high quantum efficiency devices. Recently, 3 dB squeezing at liquid nitrogen temperature and 80 MHz (3 dB roll-off bandwidth) squeezing at room temperature were reported by using a light-emitting diode. In this paper, we demonstrate over 200 MHz squeezing at 48 K.

关键词： Wideband Fluctuations Light emitting diodes Bandwidth Voltage Noise level Temperature dependence Photonics Physics Semiconductor device noise

来源：评论

学校读者我要写书评

暂无评论

Organic monolithic photorefractive materials for photonic applications

Organic monolithic photorefractive materials for photonic ap...

引用

Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： T. Wada T. Sassa T. Aoyama Y. Zhang H. Sasabe RIKEN Inst. of Phys. & Chem. Res. Saitama Japan RIKEN Institute for Physical and Chemical Research Wako Saitama Japan CREST (Core Research for Evolutional Science and Technology) JST (RIKEN) Institute for Physical and Chemical Research Wako Saitama Japan

In this paper, we describe monolithic photorefractive materials with enhanced photoconductivity, electro-optic response and photorefractivity based on main- and side chain carbazole polymers. Two types of additional functional groups were introduced to the 9-position of the 3-6 linkage main-chain polymer: carbazole for a hole transporting moiety and push-pull stilbene for an EO chromophore.

关键词： Photorefractive materials Polymers Photorefractive effect Photoconductivity Electrooptic effects Crystalline materials Phase change materials Optical films Chemical technology Holography

来源：评论

学校读者我要写书评

暂无评论

Energy-Gap Dependence of Photoinduced Charge Separation and Subsequent Charge Recombination in 1,4-Phenylene-Bridged Zinc-Free-Base Hybrid Porphyrins

引用

Chemistry – A European Journal 1999年第1期6卷 33-46页

作者： Atsuhiro Osuka Prof. Go Noya Seiji Taniguchi Dr. Tadashi Okada Prof. Yoshinobu Nishimura Dr. Iwao Yamazaki Prof. Noboru Mataga Prof. Department of Chemistry Graduate School of Science Kyoto University Kyoto 606-8502 (Japan) and Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology (JST) Corporation (Japan) Fax: (+81) 75-753-3970 Department of Chemistry Graduate School of Engineering Science and Research Center for Extreme Materials Osaka University Toyonaka 560-8531 (Japan) Department of Chemical Process Engineering Graduate School of Engineering Hokkaido University Sapporo 060-8628 (Japan)

A series of 1,4-phenylene-bridged ZP-HP hybrid porphyrins (ZP=zinc porphyrin, HP=free-base porphyrin) 1 - 8 ZH have been prepared in which an electron-donating ZP moiety is kept constant and electron-accepting HP moieties are varied by introducing electron-accepting substituents, so that the energy gap for charge separation, ZP- 1 HP*→ZP + -HP − , covers a range of about 0.9 eV in DMF. Here selective excitation at the HP moiety was employed to avoid complication in the determination of electron transfer rates derived from energy transfer, 1 ZP*-HP→ZP- 1 HP*. Definitive evidence for the electron transfer has been obtained in three solvents (benzene, THF, and DMF) through picosecond-femtosecond transient absorption studies, which have allowed the determination of the rates of the photoinduced charge separation, ZP- 1 HP*→ZP + -HP − , and subsequent thermal charge recombination ZP + -HP − →ZP-HP. Dyad 1 ZH in THF exhibits a biphasic fluorescence decay that indicates thermal repopulation of the ZP- 1 HP* from ZP + -HP − ; this has been also supported by the transient absorption spectra. On this ground, the energy levels of the ZP + -HP − ion pairs have been estimated. Similar biphasic fluorescence decay has been observed for 5 ZH in benzene; this allows furhter estimation of the energy level of the ZP + -HP − ion pairs. The free-energy-gap dependence (energy-gap law) has been probed from the normal to the upper limit region for the rate of the charge separation alone, and only the inverted region for the rate of the charge recombination. It was not possible to reproduce both energy-gap dependencies of the charge separation and the charge recombination assuming common parameter values for the reorganization energy and electronic interaction responsible for the electron transfer with the classical Marcus equation. Although both energy-gap dependencies can be approximately reproduced by means of the simplified semiclassical equation, which takes into consideration the effe

关键词： charge recombination charge separation kinetics porphyrinoids zinc

来源：评论

学校读者我要写书评

暂无评论

Difference of acrosomal serine protease system between mouse and other rodent sperm

引用

genesis 1999年第2期25卷

作者： Kazuo Yamagata Arata Honda Shin-Ichi Kashiwabara Tadashi Baba Institute of Applied Biochemistry (IAB) and Tsukuba Advanced Research Alliance (TARA) University of Tsukuba Tsukuba Science City Ibaraki Japan National Institute for Advanced Interdisciplinary Research (NAIR) Tsukuba Science City Ibaraki Japan Core Research for Evolutional Science and Technology (CREST) Japan Science Technology Corporation (JST) Kawaguchi Saitama Japan

A fraction of acrosomal proteins dispersed during calcium ionophore A23187-induced acrosome reaction was prepared from cauda epididymal sperm of wild-type and acrosin-deficient mice, rat, and hamster. The acrosome-reacted sperm were further extracted by Nonidet P-40 to obtain the detergent-soluble protein fraction. Activities of serine proteases in the two protein fractions were examined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis in the presence of gelatin. A mixture of 42- and 41-kDa gelatin-hydrolyzing proteases was found in both fractions of the wild-type mouse sperm, whereas the acrosin-deficient mouse sperm contained the active 42-kDa protease and apparently lacked the activity of the 41-kDa protease. However, exogenous bovine pancreatic trypsin compensated for the absence of acrosin in the protein fractions of the mutant mouse sperm; the gelatin-hydrolyzing activity of the 41-kDa protease appeared when the sperm proteins of the mutant mice were treated with pancreatic trypsin. Two-dimensional polyacrylamide gel electrophoresis revealed that the 42- and 41-kDa proteases were distinguished from acrosin by the isoelectric point and immunoreactivity with affinity-purified antibody against an oligopeptide corresponding to the N-terminal amino acid sequence of mouse proacrosin. Moreover, the gelatin-hydrolyzing proteins corresponding to these two proteases were not detected in rat and hamster sperm, in spite of the treatment of the sperm extracts with pancreatic trypsin, and the total amount of gelatin-hydrolyzing activities in mouse was much smaller than those in rat and hamster. These results may reflect the difference of the serine protease system for the sperm penetration through the egg zona pellucida between mouse and other rodent animals, possibly explaining why the acrosin-deficient mouse sperm are capable of penetrating the zona pellucida. Dev. Genet. 25:115–122, 1999. © 1999 Wiley-Liss, Inc.

关键词： mouse sperm zona pellucida acrosome acrosin serine protease

来源：评论

学校读者我要写书评

暂无评论

Diversity of opsin immunoreactivities in the extraretinal tissues of four anuran amphibians

引用

Journal of Experimental Zoology Part A: Ecological and Integrative Physiology 1999年第2期286卷

作者： Keiko Okano Toshiyuki Okano Tomoko Yoshikawa Atsuko Masuda Yoshitaka Fukada Tadashi Oishi Department of Biological Science Faculty of Science Nara Women's University Nara 630-8506 Japan Department of Biophysics and Biochemistry Graduate School of Science The University of Tokyo Tokyo 113-0033 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Corporation Tokyo Japan

The pineal complex, deep brain, and skin have been known to function as extraretinal photoreceptors in non-mammalian vertebrates. To see the diversity of localization of extraretinal photoreceptors in lower vertebrates having different habitats, we analyzed the opsin-like immunoreactivities in anuran amphibians, Xenopus laevis , Rana catesbeiana , Rana nigromaculata , and Bufo japonicus . An antiserum (toad Rh-AS) was raised against rhodopsin purified from the retinas of Japanese toad, B. japonicus . In the retina of all the anurans examined, the outer segments of rods were immunopositive to toad Rh-AS. The outer segments of most pinealocytes were immunopositive in R. catesbeiana, R. nigromaculata, and B. japonicus . The outer segments of photoreceptor-like cells within the frontal organ of R. nigromaculata were immunostained. Interestingly, toad Rh-AS immunostained many secretory cells of mucous glands in the head skin of B. japonicus, implying the presence of a novel photoreceptive molecule. Within the hypothalamus, toad Rh-AS immunostained many cells in the magnocellular preoptic nucleus of R. catesbeiana and B. japonicus . Toad Rh-AS also labeled cerebrospinal fluid (CSF)-contacting cells in the anterior preoptic nucleus of R. nigromaculata and those adjacent to the lateral ventricle within the septum of R. catesbeiana . Thus the distribution patterns of the rhodopsin-like immunoreactivities among the anurans were highly diverged, and there was no relationship between the distribution patterns and their habitats. J. Exp. Zool. 286:136–142, 2000. © 2000 Wiley-Liss, Inc.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Multifunctional carbazole oligomers and polymers for photorefractive applications

Multifunctional carbazole oligomers and polymers for photore...

引用

Nonlinear Optics: Materials, Fundamentals and Applications

作者： T. Wada Yadong Zhang T. Aoyama H. Sasabe Frontier Research Program The Institute of Physical and Chemical Research Core Research for Evolutional Science and Technology Wako Saitama Japan

The photorefractive properties of the carbazole films were characterized by two-beam coupling and four-wave mixing. We have demonstrated the optical image reconstruction of distorted images due to phase conjugation using a four-wave mixing setup, the optical associative memory based on phase conjugation and the angle multiplexed holographic recording. We present an example of the optical associative memory using a conjugated carbazole trimer film. The film stores the hologram images by multiple exposure in the bulk. When the imperfect image is introduced to the film, the beam is diffracted to the direction of strongest interaction with the perfect image and behave as a probe beam. The reference beam is reflected by the phase conjugation mirror and produces the perfect image.

关键词： Optical films Holographic optical components Optical distortion Optical recording Holography Nonlinear optics Optical mixing Four-wave mixing Optical polymers Associative memory

来源：评论

学校读者我要写书评

暂无评论

Estimate of the effective conjugation length of polythiophene from its |χ(3)(ω;ω,ω,−ω)| spectrum at excitonic resonance

引用

Physical Review B 1998年第20期58卷 R13430(R)-R13430(R)页

作者： S. Kishino Y. Ueno K. Ochiai M. Rikukawa K. Sanui T. Kobayashi H. Kunugita K. Ema Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Corporation (JST) 1-4-25 Mejiro Toshima-ku Tokyo 171-0031 Japan

The spectra of the third-order optical nonlinearity, |χ(3)(ω;ω,ω,−ω)|, around excitonic resonance in a spin-coated film and a Langmuir-Blodgett (LB) film of polythiophene derivative, poly(3-[2-((S)-2-methylbutoxy)ethyl]thiophene), were measured using the degenerate four-wave-mixing method. The obtained value of |χ(3)(ω;ω,ω,−ω)| at the excitonic resonance was ∼10−7esu, which was the largest value ever obtained in conjugated polymers. From the absorption spectra and |χ(3)| spectra, the average effective conjugation lengths of the spin-coated film and the LB film were estimated to be approximately 20- and 36-thiophene rings, respectively.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Binding specificity of collagen-binding stress protein, HSP47

Binding specificity of collagen-binding stress protein, HSP4...

引用

Third Congress of the Asian-Pacific Organization for Cell Biology

作者： Takaki Koide Tetuya Yorihuzi Kazuhiro Nagata Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Corporation (JST) Department of Molecular and Cellular Biology Institute for Frontier Medical Sciences Kyoto University Sakyo-ku Kyoto 606-8397 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Corporation (JST) Department of Molecular and Cellular Biology Institute for Frontier Medical Sciences Kyoto University Sakyo-ku Kyoto 606-8397 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Corporation (JST) Department of Molecular and Cellular Biology Institute for Frontier Medical Sciences Kyoto University Sakyo-ku Kyoto 606-8397 Japan

Among the endoplasmic reticulum (ER)-residenl molecular chaperones involved in the folding/modification pathways of the procollagen, HSP47 possesses a unique character because only HSP47 shows the binding specificity ... 详细信息

关键词： HSP47 Binding specificity of collagen-binding stress protein

来源：评论

学校读者我要写书评

暂无评论

Electronic structure of the Si(111)-21×21-(Ag+Au) surface

引用

Physical Review B 1998年第15期57卷 9015-9015页

作者： Xiao Tong Chun Sheng Jiang Shuji Hasegawa Core Research for Evolutional Science and Technology The Japan Science and Technology Corporation Kawaguchi Saitama 332 Kawaguchi Center Building Hon-cho 4-1-8 Japan Department of Physics School of Science University of Tokyo Tokyo 113 7-3-1 Hongo Bunkyo-ku Japan

Angle-resolved ultraviolet and x-ray photoelectron spectroscopies were used to analyze the electronic band structure of the Si(111)−21×21(R±10.89°)−(Ag+Au) surface that was induced by Au adsorption of 0.19 atomic layer onto the Si(111)-3×3-Ag surface at room temperature. We found two intrinsic dispersive surface-state bands crossing the Fermi level, which were considered to originate from an antibonding surface state of the initial 3×3−Ag structure. The electrons accumulated in these bands were found to be donated by Au adatoms. The electron transfer from Au adatoms into the substrate bulk (surface space-charge layer) was also confirmed by measuring the changes in band bending. The results seemed to be consistent with an atomic model in which the Au adatoms sit atop the Ag trimers of the 3×3−Ag framework. We proposed a kind of atomic bonding mechanism on this surface, referred to as “parasitic surface bonding,” where Au adatoms make metallic bonds via a surface-state band of the substrate surface.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Thermally stimulated current and electro-optic responses in photorefractive polymers

Thermally stimulated current and electro-optic responses in ...

引用

LEOS Summer Topical Meetings

作者： T. Aoyama T. Wada Ya-Dong Zhang Y. Moritsuki Y. Yonechi H. Sasabe K. Sasaki Y. Koike Frontier Research Program RIKEN Institute of Physical and Chemical Research Wako Saitama Japan Department of Material Sciences Faculty of Science and Technology Keio University Yokohama Japan CREST Core Research for Evolutional Science and Technology JST RIKEN Institute of Physical and Chemical Research Wako Saitama Japan Chitose Institute of Science and Technology Chitose Hokkaido Japan

We describe the depolarization of photorefractive polymers by means of thermally stimulated current (TSC) and electro-optic responses. The film was prepared by spin-coating from a chloroform solution onto an ITO substrate, and dried overnight at 500 C under vacuum. For TSC measurements, the poled polymer samples were heated at a constant heating rate of 3 C/min. The resulting depolarization current was measured using a Keithley 6512 electrometer. The EO response of the poled photorefractive polymer was measured by the reflection method.

关键词： Photorefractive effect Temperature Wavelength measurement Chemical technology Heating Photorefractive materials Materials science and technology Optical polymers Organic materials Organic chemicals

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：