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Osamu Kujirai Kei Yamada Muneyuki Kohri Haruno Okochi 《Fresenius' Journal of Analytical Chemistry》1991,339(3):133-136
Summary Inductively coupled plasma-atomic emission spectrometry (ICP-AES) has been developed for a simultaneous determination of traces of non-hydride-forming elements in high-purity Mo and molybdenum trioxide. Coprecipitation of diverse elements with lanthanum hydroxide is used to separate them from the Mo matrix and for concentration. Effects of pH and amount of La on the recoveries of diverse elements are discussed. Ten elements (Co, Cr, Cu, Fe, Mn, Ni, Ti, V, Zn, and Zr) are quantitatively recovered and determined. Matrix-matched calibration solutions are used for the determination. 相似文献
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It was found that positron annihilation mechanisms in Sn fine particles fall into two categories: annihilation with electrons inside the particles and that from particle surface trapped states. 相似文献
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Yoshiki K. Tanaka Stefan Friedrich Hiroyuki Fujioka Hans Geissel Ryugo S. Hayano Satoru Hirenzaki Kenta Itahashi Satoshi Itoh Daisuke Jido Volker Metag Hideko Nagahiro Mariana Nanova Takahiro Nishi Kota Okochi Haruhiko Outa Ken Suzuki Takatoshi Suzuki Helmut Weick 《Few-Body Systems》2013,54(7-10):1263-1266
We are going to perform an inclusive spectroscopy experiment of η′ mesic nuclei with the 12C(p,d) reaction to study in-medium properties of the η′ meson. In nuclear medium, the η′ meson mass may be reduced due to partial restoration of chiral symmetry. In case of sufficiently large mass reduction and small absorption width of η′ at normal nuclear density, peak structures of η′ mesic states in 11C will be observed near the η′ emission threshold even in an inclusive spectrum. The experiment will be carried out at GSI with proton beam supplied by SIS using FRS as a spectrometer. The detail of the experiment is described. 相似文献
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Tsunehisa Hirashita Shō Kuwahara Sota Okochi Makoto Tsuji Shuki Araki 《Tetrahedron letters》2010,51(14):1847-1851
In high-temperature water a series of benzyl and allylic alcohols reacted with 1,3-dicarbonyl compounds and activated aromatic compounds to give the alkylated products without added catalysts. 相似文献
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Anelastic strain recovery experiments of zinc single crystals strained under basal glide were performed as a function of the forest pyramidal dislocation density at room temperature. The instantaneous strain recovery of specimens unloaded after prestraining in compression is proportional to lγp1.8 where l is the average spacing between forest dislocations and γp is the prestrain. It is suggested that the instantaneous strain recovery results from the back motion of basal dislocations which multiplied under prestraining. The basal dislocations move to back under the influence of the internal stress unless they are impeded by intersection with forest dislocations. The time dependent strain recovery was measured on all specimens in either the unloaded or partially unloaded states, which enabled the activation volume of the process to be determined. The time dependent strain recovery is explainable in terms of the thermally activated back motion of basal dislocations via cutting the forest dislocations. 相似文献
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Dr. Ya Du Dr. Haishen Yang Chengpu Zhu Michael Ortiz Kenji D. Okochi Prof. Dr. Richard Shoemaker Dr. Yinghua Jin Prof. Dr. Wei Zhang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(23):7959-7963
Alkyne metathesis catalysts composed of molybdenum(VI) propylidyne and multidentate tris(2‐hydroxylbenzyl)methane ligands have been developed, which exhibit excellent stability (remains active in solution for months at room temperature), high activity, and broad functional‐group tolerance. The homodimerization and cyclooligomerization of monopropynyl or dipropynyl substrates, including challenging heterocycle substrates (e.g., pyridine), proceed efficiently at 40–55 °C in a closed system. The ligand structure and catalytic activity relationship has been investigated, which shows that the ortho groups of the multidentate phenol ligands are critical to the stability and activity of such a catalyst system. 相似文献
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Tsuyoshi Tanaka Mina Okochi Shugo Watanabe Tadashi Matsunaga 《Analytica chimica acta》2009,638(2):186-7290
An on-chip type cation-exchange chromatography system with electrochemical detection of HbA1c, which is one of the most important diabetes marker protein, was developed using ferrocene-conjugated anti-human hemoglobin (Hb) monoclonal antibody (FcAb). The FcAb was used as an electrochemical probe for the detection of each Hb. The system contains syringe pump, on-chip type cation-exchange column consisted of PDMS and cation-exchange resin beads, and a three-electrode flow-cell system. The separation conditions of HbA1c in blood calibrator samples from other Hbs, e.g. HbA0, HbA1a or HbA1b, were optimized using the on-chip type system. The electrochemical oxidation current from FcAb reacting with each Hb was measured at 350 mV (vs. Ag/AgCl). Hbs including HbA1a and HbA1b, HbA1c and HbA0 fractions were eluted in this order. A linear relationship between HbA1c levels and electrochemical oxidation currents was obtained in the range from 4.0% to 12.6% HbA1c. All procedure including antigen-antibody reaction was completed in 15 min. Furthermore, a good correlation was obtained between KO500 method (HPLC) and our proposed method. These results indicate that the on-chip type system with electrochemical detection can be applied to a novel POCT device for rapid and precise detection of HbA1c. 相似文献
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