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61.
M. Aglietta C. Castagnoli A. Castellina W. Fulgione L. Periale O. Saavedra G. Trinchero S. Vernetto M. Fujii Y. Fujimoto Y. Fukada Y. Hatano T. Hara A. Ohsawa T. Saito H. Komori H. Oda T. Yanagita 《Il Nuovo Cimento C》1991,14(6):639-648
Summary A method for detecting strange-quark matter is discussed. In order to confirm the existence of strange-quark matter in the
cosmic radiation, a new instrument under construction for a balloon experiment is presented.
Due to the relevance of its scientific content, this paper has been given priority by the Journal Direction. 相似文献
62.
Takashi Komori Nobuhiro Muramatsu Tamotsu Kondo 《Applied biochemistry and biotechnology》1987,14(1):29-36
A novel immobilized-enzyme system that has glucoamylase on the surface of, and glucose oxidase within, polyurea microcapsules
was developed. This system was found to carry out its sequential enzymatic reaction effectively. It was also demonstrated
that the use of microcapsules was useful for this immobilized-enzyme system since a large amount of the second enzyme, glucose
oxidase, was required for the sequential reaction to proceed efficiently. In addition, this system was found helpful for making
the size of reaction batches smaller. 相似文献
63.
K. Gunji Z. Yoshida T. Adachi T. Komori 《Journal of Radioanalytical and Nuclear Chemistry》1987,118(3):225-233
Isotope dilution mass spectrometry using enriched isotope96Ru as a spike was applied to the determination of ruthenium as a fission product. Ruthenium in the solution was oxidized to RuO4 by Ce/IV/ and separated from coexisting metal elements by distillation. Silica-gel technique was employed to enhance ion current of ruthenium in the mass spectrometric measurement. The lower detection limit was 0.005 g ml–1 and the relative standard deviations /n=3/ for 1.2 and 0.05 g ml–1 of ruthenium were 0.2 and 0.5%, respectively. 相似文献
64.
Komori K Takada K Hatozaki O Oyama N 《Langmuir : the ACS journal of surfaces and colloids》2007,23(11):6446-6452
The electrochemiluminescence (ECL) of magnetic microbeads modified with tris(2,2'-bipyridine)ruthenium(II) ([Ru(bpy)3]2+) was studied in the presence of tri-n-propylamine (TPA) to develop highly sensitive ECL detection system, where the employed microbead has a diameter of 4.5 microm. The ECL signal of the [Ru(bpy)3]2+ derivative-modified magnetic microbeads was found to be affected by the geometrical distribution of the magnetic microbeads on the electrode surface. The ECL peak intensity increased with increasing the number of the beads on the electrode surfaces up to 1.6 x 10(6) beads cm(-2), although above 1.6 x 10(6) beads cm(-2), it decreased. The ECL decrease arises from the physical prevention of the ECL from reaching the photomultiplier tube by the excessive beads. The observed peak ECL signal of the [Ru(bpy)3]2+ derivative-modified magnetic microbeads in the presence of NaN3, which serves as a preservative substance, mainly appeared at a potential of +0.90 V vs Ag/AgCl where [Ru(bpy)3]2+ is hardly oxidized, whereas the ECL signal in the absence of NaN3 appeared at a potential of +1.15 V. The presence of NaN3 on the electrode surface retards formation of an oxide layer on the electrode surfaces and promotes TPA oxidation. The ECL response at +0.90 V was mainly attributed to ECL reaction of excited-state [Ru(bpy)3]2+* formed by oxidation of [Ru(bpy)3]+ with TPA radical cation, where the [Ru(bpy)3]+ was generated by reduction of [Ru(bpy)3]2+ with TPA radical. 相似文献
65.
Self-assembled MnN nanoislands have been prepared on Cu(001) substrate. The nanoislands show a square shape and a well-defined size. They are regularly arrayed with a periodicity of (3.5+/-0.1) nanometer and form a two-dimensional square superstructure. The MnN island superstructure is stabilized by a short-range mechanism. A structural model has been proposed to explain the self-assembly and the high quality of the superstructure. 相似文献
66.
A. Toyoshima K. Ooe S. Miyashita M. Asai M. F. Attallah N. Goto N. S. Gupta H. Haba M. Huang J. Kanaya Y. Kaneya Y. Kasamatsu Y. Kitatsuji Y. Kitayama K. Koga Y. Komori T. Koyama J. V. Kratz H. V. Lerum Y. Oshimi V. Pershina D. Sato T. K. Sato Y. Shigekawa A. Shinohara A. Tanaka K. Tsukada S. Tsuto T. Yokokita A. Yokoyama J. P. Omtvedt Y. Nagame M. Schädel 《Journal of Radioanalytical and Nuclear Chemistry》2015,303(2):1169-1172
67.
Ryo Onishi Keigo Matsuda Keiko Takahashi Ryoichi Kurose Satoru Komori 《International Journal of Multiphase Flow》2011
This study presents an attempt to retrieve collision kernel values from changes in the droplet size distribution due to collision growth. Original linear and nonlinear inversion schemes are presented, which use the simple a priori assumption that the total collision rate is given by the sum of the gravitational and turbulent contributions. Our schemes directly handle binned (discretized) size distributions and, therefore, do not require any assumptions on distribution functional forms, such as the self-similarity assumption. To validate the schemes, three-dimensional direct numerical simulation (DNS) of colliding droplets in steady isotropic turbulence is performed. In the DNS, air turbulence is calculated using a pseudo-spectral method, while droplet motions are tracked by the Lagrangian method. Comparison between the retrieved collision kernels and the collision kernels obtained directly from the DNS show that for low Reynolds number flows both the linear and nonlinear inversion schemes give good accuracy. However, for higher Reynolds number flows the linear inversion scheme gives significantly larger retrieval errors, while the errors for the nonlinear scheme remain small. 相似文献
68.
Osamu Komori 《Annals of the Institute of Statistical Mathematics》2011,63(5):961-979
We discuss receiver operating characteristic (ROC) curve and the area under the ROC curve (AUC) for binary classification
problems in clinical fields. We propose a statistical method for combining multiple feature variables, based on a boosting
algorithm for maximization of the AUC. In this iterative procedure, various simple classifiers that consist of the feature
variables are combined flexibly into a single strong classifier. We consider a regularization to prevent overfitting to data
in the algorithm using a penalty term for nonsmoothness. This regularization method not only improves the classification performance
but also helps us to get a clearer understanding about how each feature variable is related to the binary outcome variable.
We demonstrate the usefulness of score plots constructed componentwise by the boosting method. We describe two simulation
studies and a real data analysis in order to illustrate the utility of our method. 相似文献
69.
Ishii K Kubo K Sakurada T Komori K Sakai Y 《Chemical communications (Cambridge, England)》2011,47(17):4932-4934
We have applied phthalocyaninatosilicon (SiPc) covalently linked to one or two tetramethyl-1-piperidinyloxyl (TEMPO) radicals as fluorescence probes for detecting ascorbic acid in biological systems. 相似文献
70.
Direct synthesis of cup-stacked carbon nanofiber microspheres by the catalytic pyrolysis of poly(ethylene glycol) 总被引:1,自引:0,他引:1
Ko S Takahashi Y Sakoda A Sakai Y Komori K 《Langmuir : the ACS journal of surfaces and colloids》2012,28(23):8760-8766
Uniformly sized microspheres tangled with cup-stacked carbon nanofibers (CSCNFs) were directly synthesized by the pyrolysis of poly(ethylene glycol) (PEG) with a nickel catalyst. A PEG/Ni membrane was prepared on a silicon wafer surface by heating it to 750 °C at a heating rate of 15 °C min(-1). The wafer was heated to a temperature of 400 °C and was held at that temperature for 1 h before raising the temperature to 750 °C for 10 min to form the CSCNF microspheres. The final CSCNF microspheres and the intermediates were evaluated using scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, and Raman spectroscopy to elucidate the growth mechanism. Furthermore, the CSCNF microspheres were successfully dispersed and maintained their spherical shape in an aqueous solution containing 0.5% Nafion. The CSCNF microspheres have the potential to work as a sophisticated carrier with high adsorption and fast electron-transfer exchange properties based on the graphene edges of the nanofiber surface. 相似文献