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Search Results: 1 - 10 of 87728 matches for " I. Iwayama "
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Universal relationship between crystallinity and irreversibility field of MgB2
A. Yamamoto,J. Shimoyama,S. Ueda,Y. Katsura,I. Iwayama,S. Horii,K. Kishio
Physics , 2005, DOI: 10.1063/1.1937991
Abstract: The relationship between irreversibility field, Hirr, and crystallinity of MgB2 bulks including carbon substituted samples was studied. The Hirr was found to increase with an increase of FWHM of MgB2 (110) peak, which corresponds to distortion of honeycomb boron sheet, and their universal correlation was discovered even including carbon substituted samples. Excellent Jc characteristics under high magnetic fields were observed in samples with large FWHM of (110) due to the enhanced intraband scattering and strengthened grain boundary flux pinning. The relationship between crystallinity and Hirr can explain the large variation of Hirr for MgB2 bulks, tapes, single crystals and thin films.
Desempenho de novilhas búfalas terminadas em confinamento em resposta ao uso de promotor de crescimento ou de esferas de chumbo no útero
Marques, J.A.;Iwayama, P.T.;Prado, I.N.;Albuquerque, K.P.;Scomparin, V.X.;Nascimento, W.G.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2006, DOI: 10.1590/S0102-09352006000600023
Abstract: a completely randomized design with three treatments and seven replicates was used to evaluate the daily weight gain, dry matter intake, feed:weight gain ratio and hot carcass yield of 20 buffalo heifers averaging 350kg and 16 months of age, kept in feed lot for 84 days. animals were fed on sugar cane silage + 1% of urea and soybean, corn meal and salt minerals. the treatments were emp - open heifers gpr - growth promoter implanted heifers and lea - heifers with 100 lead spheres introduced in the uterus. the grp animals showed higher body weight, daily weight gain and feed:weight gain ratio (444.0kg, 1.2kg and 9.7kg/kg) in comparison to emp animals (412.6kg, 9kg and 11.4kg /kg) and lea animals (407.9, 8kg and 12.2kg/kg), respectively. no significant mean differences between emp and lea animals for all the studied traits and no treatment effect on carcass yield were observed.
Test Collections for Patent-to-Patent Retrieval and Patent Map Generation in NTCIR-4 Workshop
Atsushi Fujii,Makoto Iwayama,Noriko Kando
Computer Science , 2004,
Abstract: This paper describes the Patent Retrieval Task in the Fourth NTCIR Workshop, and the test collections produced in this task. We perform the invalidity search task, in which each participant group searches a patent collection for the patents that can invalidate the demand in an existing claim. We also perform the automatic patent map generation task, in which the patents associated with a specific topic are organized in a multi-dimensional matrix.
Contribution of hidden modes to nonlinear epidemic dynamics in urban human proximity networks
Naoya Fujiwara,Abhijeet R. Sonawane,Koji Iwayama,Kazuyuki Aihara
Physics , 2015,
Abstract: Recently developed techniques to acquire high-quality human mobility data allow large-scale simulations of the spread of infectious diseases with high spatial and temporal resolution.Analysis of such data has revealed the oversimplification of existing theoretical frameworks to infer the final epidemic size or influential nodes from the network topology. Here we propose a spectral decomposition-based framework for the quantitative analysis of epidemic processes on realistic networks of human proximity derived from urban mobility data. Common wisdom suggests that modes with larger eigenvalues contribute more to the epidemic dynamics. However, we show that hidden dominant structures, namely modes with smaller eigenvalues but a greater contribution to the epidemic dynamics, exist in the proximity network. This framework provides a basic understanding of the relationship between urban human motion and epidemic dynamics, and will contribute to strategic mitigation policy decisions.
Finite-size scaling in globally coupled phase oscillators with a general coupling scheme
Isao Nishikawa,Koji Iwayama,Gouhei Tanaka,Takehiko Horita,Kazuyuki Aihara
Physics , 2012,
Abstract: We investigate a critical exponent related to synchronization transition in globally coupled nonidentical phase oscillators. The critical exponents of susceptibility, correlation time, and correlation size are significant quantities to characterize fluctuations in coupled oscillator systems of large but finite size and understand a universal property of synchronization. These exponents have been identified for the sinusoidal coupling but not fully studied for other coupling schemes. Herein, for a general coupling function including a negative second harmonic term in addition to the sinusoidal term, we numerically estimate the critical exponent of the correlation size, denoted by $\nu_+$, in a synchronized regime of the system by employing a non-conventional statistical quantity. First, we confirm that the estimated value of $\nu_+$ is approximately 5/2 for the sinusoidal coupling case, which is consistent with the well-known theoretical result. Second, we show that the value of $\nu_+$ increases with an increase in the strength of the second harmonic term. Our result implies that the critical exponent characterizing synchronization transition largely depends on the coupling function.
Topic Graph Generation for Query Navigation: Use of Frequency Classes for Topic Extraction
Yoshiki Niwa,Shingo Nishioka,Makoto Iwayama,Akihiko Takano,Yoshihiko Nitta
Computer Science , 1997,
Abstract: To make an interactive guidance mechanism for document retrieval systems, we developed a user-interface which presents users the visualized map of topics at each stage of retrieval process. Topic words are automatically extracted by frequency analysis and the strength of the relationships between topic words is measured by their co-occurrence. A major factor affecting a user's impression of a given topic word graph is the balance between common topic words and specific topic words. By using frequency classes for topic word extraction, we made it possible to select well-balanced set of topic words, and to adjust the balance of common and specific topic words.
Genome-Wide Association Study of Schizophrenia in Japanese Population
Kazuo Yamada, Yoshimi Iwayama, Eiji Hattori, Kazuya Iwamoto, Tomoko Toyota, Tetsuo Ohnishi, Hisako Ohba, Motoko Maekawa, Tadafumi Kato, Takeo Yoshikawa
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0020468
Abstract: Schizophrenia is a devastating neuropsychiatric disorder with genetically complex traits. Genetic variants should explain a considerable portion of the risk for schizophrenia, and genome-wide association study (GWAS) is a potentially powerful tool for identifying the risk variants that underlie the disease. Here, we report the results of a three-stage analysis of three independent cohorts consisting of a total of 2,535 samples from Japanese and Chinese populations for searching schizophrenia susceptibility genes using a GWAS approach. Firstly, we examined 115,770 single nucleotide polymorphisms (SNPs) in 120 patient-parents trio samples from Japanese schizophrenia pedigrees. In stage II, we evaluated 1,632 SNPs (1,159 SNPs of p<0.01 and 473 SNPs of p<0.05 that located in previously reported linkage regions). The second sample consisted of 1,012 case-control samples of Japanese origin. The most significant p value was obtained for the SNP in the ELAVL2 [(embryonic lethal, abnormal vision, Drosophila)-like 2] gene located on 9p21.3 (p = 0.00087). In stage III, we scrutinized the ELAVL2 gene by genotyping gene-centric tagSNPs in the third sample set of 293 family samples (1,163 individuals) of Chinese descent and the SNP in the gene showed a nominal association with schizophrenia in Chinese population (p = 0.026). The current data in Asian population would be helpful for deciphering ethnic diversity of schizophrenia etiology.
Population-Specific Haplotype Association of the Postsynaptic Density Gene DLG4 with Schizophrenia, in Family-Based Association Studies
Shabeesh Balan, Kazuo Yamada, Eiji Hattori, Yoshimi Iwayama, Tomoko Toyota, Tetsuo Ohnishi, Motoko Maekawa, Manabu Toyoshima, Yasuhide Iwata, Katsuaki Suzuki, Mitsuru Kikuchi, Takeo Yoshikawa
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0070302
Abstract: The post-synaptic density (PSD) of glutamatergic synapses harbors a multitude of proteins critical for maintaining synaptic dynamics. Alteration of protein expression levels in this matrix is a marked phenomenon of neuropsychiatric disorders including schizophrenia, where cognitive functions are impaired. To investigate the genetic relationship of genes expressed in the PSD with schizophrenia, a family-based association analysis of genetic variants in PSD genes such as DLG4, DLG1, PICK1 and MDM2, was performed, using Japanese samples (124 pedigrees, n = 376 subjects). Results showed a significant association of the rs17203281 variant from the DLG4 gene, with preferential transmission of the C allele (p = 0.02), although significance disappeared after correction for multiple testing. Replication analysis of this variant, found no association in a Chinese schizophrenia cohort (293 pedigrees, n = 1163 subjects) or in a Japanese case-control sample (n = 4182 subjects). The DLG4 expression levels between postmortem brain samples from schizophrenia patients showed no significant changes from controls. Interestingly, a five marker haplotype in DLG4, involving rs2242449, rs17203281, rs390200, rs222853 and rs222837, was enriched in a population specific manner, where the sequences A-C-C-C-A and G-C-C-C-A accumulated in Japanese (p = 0.0009) and Chinese (p = 0.0007) schizophrenia pedigree samples, respectively. However, this could not be replicated in case-control samples. None of the variants in other examined candidate genes showed any significant association in these samples. The current study highlights a putative role for DLG4 in schizophrenia pathogenesis, evidenced by haplotype association, and warrants further dense screening for variants within these haplotypes.
Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states: (I) Experiment
Kyo Nakajima,James R. Harries,Hiroshi Iwayama,Susumu Kuma,Yuki Miyamoto,Mitsuru Nagasono,Chiaki Ohae,Tadashi Togashi,Makina Yabashi,Eiji Shigemasa,Noboru Sasao
Physics , 2014, DOI: 10.7566/JPSJ.84.054301
Abstract: In this paper, we report the results of measurements of the intensities and delays of super-radiance decays from excited helium atoms at multiple wavelengths. The experiment was performed using extreme ultraviolet radiation produced by the free electron laser at the SPring-8 Compact SASE Source test accelerator facility as an excitation source. We observed super-radiant transitions on the $1s3p \to 1s2s$ ($\lambda=$502 nm), $1s3d \to 1s2p$ ($\lambda=$668 nm), and $1s3s \to 1s2p$ ($\lambda=$728 nm) transitions. The pulse energy of each transition and its delay time were measured as a function of the target helium gas density. Several interesting features of the data, some of which appear to contradict with the predictions of the simple two-level super-radiance theory, are pointed out.
Association of Transcription Factor Gene LMX1B with Autism
Ismail Thanseem, Kazuhiko Nakamura, Ayyappan Anitha, Shiro Suda, Kazuo Yamada, Yoshimi Iwayama, Tomoko Toyota, Masatsugu Tsujii, Yasuhide Iwata, Katsuaki Suzuki, Hideo Matsuzaki, Keiko Iwata, Toshiro Sugiyama, Takeo Yoshikawa, Norio Mori
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0023738
Abstract: Multiple lines of evidence suggest a serotoninergic dysfunction in autism. The role of LMX1B in the development and maintenance of serotoninergic neurons is well known. In order to examine the role, if any, of LMX1B with autism pathophysiology, a trio-based SNP association study using 252 family samples from the AGRE was performed. Using pair-wise tagging method, 24 SNPs were selected from the HapMap data, based on their location and minor allele frequency. Two SNPs (rs10732392 and rs12336217) showed moderate association with autism with p values 0.018 and 0.022 respectively in transmission disequilibrium test. The haplotype AGCGTG also showed significant association (p = 0.008). Further, LMX1B mRNA expressions were studied in the postmortem brain tissues of autism subjects and healthy controls samples. LMX1B transcripts was found to be significantly lower in the anterior cingulate gyrus region of autism patients compared with controls (p = 0.049). Our study suggests a possible role of LMX1B in the pathophysiology of autism. Based on previous reports, it is likely to be mediated through a seretoninergic mechanism. This is the first report on the association of LMX1B with autism, though it should be viewed with some caution considering the modest associations we report.
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