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排序方式: 共有183条查询结果,搜索用时 15 毫秒
21.
Dr. Wasim Abuillan Dr. Mariam Veschgini Salomé Mielke Dr. Akihisa Yamamoto Xianhe Liu Dr. Oleg Konovalov Prof. Dr. Marie Pierre Krafft Prof. Dr. Motomu Tanaka 《Chemphyschem》2019,20(6):898-904
The structure and lateral correlation of fluorocarbon-hydrocarbon tetrablock di(F10Hm) domains at the air/water interface have been determined by quantitative analysis of grazing incidence small-angle X-ray scattering (GISAXS) data. The measured GISAXS signals can be well represented by the full calculation of the form and structure factors. The form factor suggests that di(F10Hm) domains take a hemiellipsoid shape. Both major and minor axes of the hemiellipsoids monotonically increased in response to the elongation of the hydrocarbon blocks, which can be explained by the concominant increase in van der Waals interaction. The structure factor calculated from the GISAXS signals suggests that the domains take an orthorhombic lattice. Remarkably, the lateral correlation can reach over a distance that is more than 14 times longer than the distance to the nearest neighbors. Our data suggest that quantitative GISAXS enables the optimal design of mesoscopic self-assemblies at the air/water interface by fine-tuning of the structures of molecular building blocks. 相似文献
22.
We demonstrate laser-field-free molecular orientation with the combination of a moderate electrostatic field and an intense nonresonant rapidly turned-off laser field, which can be shaped with the plasma shutter technique. We use OCS (carbonyl sulfide) molecules as a sample. Molecular orientation is adiabatically created in the rising part of the laser pulse, and it is found to revive at around the rotational period of an OCS molecule with the same degree of orientation as that at the peak of the laser pulse in the virtually laser-field-free condition. This accomplishment means that a new class of molecular sample has become available for various applications. 相似文献
23.
The kinetics of light-induced defect creation in a-Si:H is studied in early-time limit and as function of pre-existing defects of different thermal stability by electron spin resonance and optical spectroscopy techniques. Both for cw and for laser pulse exposures, the early-time kinetics follows sublinear tβ time dependences, similar to the long-time limit. In addition, the overall defect creation rate is not a single function of the total defect number. Instead, it depends on the thermal stability, or annealing energy distribution, of the defects present in the film. Furthermore, creation of the thermally less stable defects is unaffected by the presence of a large number of stable defects introduced by pre-exposure at a higher temperature. These findings question the existing defect creation models. Thermal stability of the light-induced defects depends on the network microstructure, the less stable defects being created in a-Si:H deposited near microcrystalline transition. 相似文献
24.
Akihisa Yamaguchi Yu Mashima Tomokazu Iyoda 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(43):13000-13004
This paper describes the reversible control of the size of liquid‐metal nanoparticles under ultrasonication. Gallium was utilized as a liquid metal, which has a melting point of 29.8 °C. Investigating the effects of ultrasonication (power, time, and temperature) on the formation of gallium nanoparticles revealed that the process is similar to the formation of oil in water (O/W) or water in oil (W/O) emulsions, as the temperature significantly affects the size of the gallium nanoparticles (GaNPs). Under ultrasonication, the balance between the break‐up and coalescence of the GaNPs can be adjusted by changing the temperature or adding acid through modulating the natural surface oxide layer (which can be removed with acid) and the stabilizing effect of the surfactant dodecanethiol. Coalescence was predominant at higher temperatures, whereas particle break‐up was found to be predominant at lower temperatures. Furthermore, the change in size was accompanied by a shift in the plasmonic absorption of the GaNPs in the UV region. 相似文献
25.
Optical Review - We propose a spatial mode compensation method using progressive phase conjugation (PPC) to establish a dynamic control technology for mode distribution in multi-mode fiber (MMF).... 相似文献
26.
The formation of the supercooled liquid region and devitrification behavior of Ni-based glassy alloys were studied by using X-ray diffraction, transmission electron microscopy, differential scanning calorimetry and isothermal calorimetry. oC68 Ni10Zr7-type phase is primarily formed in the studied alloys in the initial stage of the devitrification process by nucleation and three-dimensional diffusion controlled growth. The replacement of Cu by Ni in Cu55Zr30Ti10Pd5 glassy alloy induces precipitation of oC68 Ni10Zr7 phase directly from the glassy phase. The reasons for such a behavior are discussed taking into account mixing enthalpy in a liquid state and the interval of the supercooled liquid region. 相似文献
27.
Sakai S Matsuda R Adachi R Akiyama H Maitani T Ohno Y Oka M Abe A Seiki K Oda H Shiomi K Urisu A 《Journal of AOAC International》2008,91(1):123-129
The labeling of foods containing material derived from crustaceans such as shrimp and crab is to become mandatory in Japan because of increases in the number of allergy patients. To ensure proper labeling, 2 novel sandwich enzyme-linked immunosorbent assay (ELISA) kits for the determination of crustacean protein in processed foods, the N kit (Nissui Pharmaceutical Co., Ltd, Ibaraki, Japan) and the M kit (Maruha Nichiro Holdings, Inc., Ibaraki, Japan), have been developed. Five types of model processed foods containing 10 and/or 11.9 microg/g crustacean soluble protein were prepared for interlaboratory evaluation of the performance of these kits. The N kit displayed a relatively high level of reproducibility relative standard deviation (interlaboratory precision; 4.0-8.4% RSDR) and sufficient recovery (65-86%) for all the model processed foods. The M kit displayed sufficient reproducibility (17.6-20.5% RSDR) and a reasonably high level of recovery (82-103%). The repeatability relative standard deviation (RSDr) values regarding the detection of crustacean proteins in the 5 model foods were mostly < 5.1% RSDr for the N kit and 9.9% RSDr for the M kit. In conclusion, the results of this interlaboratory evaluation suggest that both these ELISA kits would be very useful for detecting crustacean protein in processed foods. 相似文献
28.
L. Deng & T. Kako 《计算数学(英文版)》1997,15(3):265-278
1.IntroductionInthispaper,westudyanumericalmethodtocalculateeigen-frequenciesofacoupledvibrationbetweenacousticfieldandplate.Atypicalapplicationofthisresearchistoreduceanoiseinsideacarcausedbyanengineorothersourcesofthesound.OurstudywasmotivatedbytheworkofHagiwaraetal.15].Thebackgroundoftheresearchandsomeapplicationscanbeseenin[5].Werestrictourresearchtotheproblemswhereexactsolutionscanbegiveninaspecialcase.Themainfeatureofourresearchisthemathematicallyrigorousapproachtotheproblem.Weformulat… 相似文献
29.
Wavelet processing and digital interferometric contrast to improve reconstructions from X‐ray Gabor holograms 下载免费PDF全文
Juan C. Aguilar Masaki Misawa Kiyofumi Matsuda Yoshio Suzuki Akihisa Takeuchi Masato Yasumoto 《Journal of synchrotron radiation》2018,25(3):808-817
In this work, the application of an undecimated wavelet transformation together with digital interferometric contrast to improve the resulting reconstructions in a digital hard X‐ray Gabor holographic microscope is shown. Specifically, the starlet transform is used together with digital Zernike contrast. With this contrast, the results show that only a small set of scales from the hologram are, in effect, useful, and it is possible to enhance the details of the reconstruction. 相似文献
30.
Mahesh Datt Bhatt Akihisa Baba Takeaki Sakurai Katsuhiro Akimoto 《Journal of Solid State Electrochemistry》2012,16(3):1141-1149
We have performed ultraviolet photoelectron spectroscopy measurements and density functional theory calculations to study
the electronic structure at the interface between organic semiconductor (3-(4-biphenylyl)-4-phenyl-5-(4-tert-butyl phenyl)-1,2,4-triazole
(TAZ)) and metals (Ca, Mg, Ag, and Au). The basic mechanism of interface states at organic–metal interfaces can be understood
by controlling the injection of charge carriers at these interfaces. The position of highest occupied molecular orbital relative
to the Fermi level and the magnitude of the interface dipole are measured for each organic–metal interface. For TAZ on Ca,
Mg, and Ag, interface states are observed near the Fermi level. However, no interface state is observed for TAZ on Au. It
is analyzed qualitatively that the interface state is formed due to interaction of TAZ lowest unoccupied molecular orbital
composed of C2p and metal s levels. It is suggested that the interface state plays an important role in charge transport at
the interface. The mechanism of formation of interface states and electrical properties are discussed. 相似文献