oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 5 )

2019 ( 10 )

2018 ( 53 )

2017 ( 42 )

Custom range...

Search Results: 1 - 10 of 5996 matches for " Takashi Matsumoto "
All listed articles are free for downloading (OA Articles)
Page 1 /5996
Display every page Item
The Key Factor of Acid Mine Drainage (AMD) in the History of the Contribution of Mining Industry to the Prosperity of the United States and South Africa: A Review  [PDF]
Shinji Matsumoto, Hideki Shimada, Takashi Sasaoka
Natural Resources (NR) , 2016, DOI: 10.4236/nr.2016.77039
Abstract: Mining industry has significantly contributed to the prosperity of the nation with economic growth, whereas mining operation has caused Acid Mine Drainage (AMD) with the abandonment of mines. As some researchers suggest, the history of AMD is, generally, affected by the change in not only mining industry but also in social and economic conditions. Thus, historical analysis is an effective way to find the key factors of AMD. In this study, in order to find the key factors of AMD, we examine the history of the United States (U.S.) and South Africa, where their economy had been developed owing to the large-scale mining, based on the findings in the previous studies. The results indicated that the abandoned mines due to the economic depression triggered AMD in the U.S. and South Africa. While the U.S. had progressively adopted anti-AMD methods in terms of prevention, prediction, and remediation (PPR) as a comprehensive approach, especially since the 1970s onwards because of the rise of environmental consciousness as well as strict regulations, South Africa is at the early stage of implementing the regulations following PPR. The public attention should be directed to environmental conservation in addition to the implementation of the regulations in South Africa. The improvement in socio-economic conditions is, additionally, necessary for the rise of environmental consciousness in South Africa in the light of the three pillars of sustainable development: social, economic, and environmental elements.
Association between Geographic Accessibility of Home Care Clinics and Hospitalization in Japan Using Geographic Information Systems and Insurance Claim Data  [PDF]
Takashi Naruse, Hiroshige Matsumoto, Natsuki Yamamoto, Satoko Nagata
Health (Health) , 2016, DOI: 10.4236/health.2016.810102
Abstract: Measuring and improving home care clinic resource volume and geographic allocation are an important public health issue regarding prolonging home care system usage among disabled elderly people. This study examined clinic volume and accessibility’s association with hospitalization duration among disabled elderly people in 13 municipalities in Japan; additionally, this study compared clinic volume and accessibility’s ability to explain hospitalization duration in this population. Home care clinics’ service volume and geographic accessibility were calculated for 17 municipalities using public data and geographic information systems. We analyzed medical claim data from October 2012; the sample included 22,662 persons who were aged ≥75 years, certified as disabled in daily living, and lived in 13 municipalities regarding which data could be obtained for all examined municipality characteristics. Multilevel logistic models with random intercepts were constructed for municipalities and individual- and municipality-level independent variables in order to examine home care clinic volume and accessibility’s correlation with hospitalization duration. Clinic volume ranged from 0 to 9.53 per 10,000 elderly people; clinic accessibility ranged from 0% to 83%. Clinic volume and accessibility were both significantly negatively correlated with hospitalization duration of ≥10 days (odds ratios, 0.944 and 0.713; confidence intervals, 0.914 - 0.974 and 0.553 - 0.921, respectively). Clinics were not homogeneously geographically distributed; clinic accessibility explained hospitalization duration better than clinic volume. Clinic accessibility may more accurately indicate care clinic allocation appropriateness than clinic volume.
Potential Use of Stem Cells for Kidney Regeneration
Takashi Yokoo,Kei Matsumoto,Shinya Yokote
International Journal of Nephrology , 2011, DOI: 10.4061/2011/591731
Abstract: Significant advances have been made in stem cell research over the past decade. A number of nonhematopoietic sources of stem cells (or progenitor cells) have been identified, including endothelial stem cells and neural stem cells. These discoveries have been a major step toward the use of stem cells for potential clinical applications of organ regeneration. Accordingly, kidney regeneration is currently gaining considerable attention to replace kidney dialysis as the ultimate therapeutic strategy for renal failure. However, due to anatomic complications, the kidney is believed to be the hardest organ to regenerate; it is virtually impossible to imagine such a complicated organ being completely rebuilt from pluripotent stem cells by gene or chemical manipulation. Nevertheless, several groups are taking on this big challenge. In this manuscript, current advances in renal stem cell research are reviewed and their usefulness for kidney regeneration discussed. We also reviewed the current knowledge of the emerging field of renal stem cell biology. 1. Introduction Recent advances in stem cell research have brought the possibility of using somatic stem cells for organ regeneration one step closer to realization. Newly developed organs can then be used in clinical organ replacement. However, anatomically complicated organs such as the kidney have proven more refractory to stem cell-based regenerative techniques. The kidney retains the potential to regenerate if the damage is not too severe, and the kidney structure remains intact. It was previously believed that bone marrow-derived stem cells could differentiate into renal-resident cells and participate in kidney regeneration after renal ischemia/reperfusion injury [1, 2]; however, recent studies have suggested that the number of bone marrow-derived cells that engraft injured tubules and develop into functional renal tissue is very low and, thus, their overall contribution to renal repair would be minor in the setting of acute kidney injury [3, 4]. Also, during the progression of chronic renal failure, bone marrow-derived stem cells supplied by intravenous administration located in the kidney and contributed to attenuate renal fibrosis [5]. However, in cases of irreversible damage to the kidney, as can occur with long-term dialysis, the kidney structure is totally lost and, therefore, these cell therapy approach seems not to be applicable. Thus, any application of regenerative medicine in end-stage renal disease will require the de novo development of an entire functional kidney. In terms of a functional whole
File Size Distribution Model in Enterprise File Server toward Efficient Operational Management
Toshiko Matsumoto,Takashi Onoyama,Norihisa Komoda
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
Asymmetric Distribution of Gene Expression in the Centromeric Region of Rice Chromosome 5
Hiroshi Ikawa,Takuji Sasaki,Takashi Matsumoto
Frontiers in Plant Science , 2011, DOI: 10.3389/fpls.2011.00016
Abstract: There is controversy as to whether gene expression is silenced in the functional centromere. The complete genomic sequences of the centromeric regions in higher eukaryotes have not been fully elucidated, because the presence of highly repetitive sequences complicates many aspects of genomic sequencing. We performed resequencing, assembly, and sequence finishing of two P1-derived artificial chromosome clones in the centromeric region of rice (Oryza sativa L.) chromosome 5 (Cen5). The pericentromeric region, where meiotic recombination is silenced, is located at the center of chromosome 5 and is 2.14 Mb long; a total of six restriction-fragment-length polymorphism markers (R448, C1388, S20487S, E3103S, C53260S, and R2059) genetically mapped at 54.6 cM were located in this region. In the pericentromeric region, 28 genes were annotated on the short arm and 45 genes on the long arm. To quantify all transcripts in this region, we performed massive parallel sequencing of mRNA. Transcriptional density (total length of transcribed region/length of the genomic region) and expression level (number of uniquely mapped reads/length of transcribed region) were calculated on the basis of the mapped reads on the rice genome. Transcriptional density and expression level were significantly lower in Cen5 than in the average of the other chromosomal regions. Moreover, transcriptional density in Cen5 was significantly lower on the short arm than on the long arm; the distribution of transcriptional density was asymmetric. The genomic sequence of Cen5 has been integrated into the most updated reference rice genome sequence constructed by the International Rice Genome Sequencing Project.
Multi-moment advection scheme in three dimension for Vlasov simulations of magnetized plasma
Takashi Minoshima,Yosuke Matsumoto,Takanobu Amano
Physics , 2012, DOI: 10.1016/j.jcp.2012.11.024
Abstract: We present an extension of the multi-moment advection scheme (Minoshima et al., 2011, J. Comput. Phys.) to the three-dimensional case, for full electromagnetic Vlasov simulations of magnetized plasma. The scheme treats not only point values of a profile but also its zeroth to second order piecewise moments as dependent variables, and advances them on the basis of their governing equations. Similar to the two-dimensional scheme, the three-dimensional scheme can accurately solve the solid body rotation problem of a gaussian profile with little numerical dispersion or diffusion. This is a very important property for Vlasov simulations of magnetized plasma. We apply the scheme to electromagnetic Vlasov simulations. Propagation of linear waves and nonlinear evolution of the electron temperature anisotropy instability are successfully simulated with a good accuracy of the energy conservation.
Multi-Moment Advection scheme for Vlasov simulations
Takashi Minoshima,Yosuke Matsumoto,Takanobu Amano
Physics , 2011, DOI: 10.1016/j.jcp.2011.05.010
Abstract: We present a new numerical scheme for solving the advection equation and its application to Vlasov simulations. The scheme treats not only point values of a profile but also its zeroth to second order piecewise moments as dependent variables, for better conservation of the information entropy. We have developed one- and two-dimensional schemes and show that they provide quite accurate solutions within reasonable usage of computational resources compared to other existing schemes. The two-dimensional scheme can accurately solve the solid body rotation problem of a gaussian profile for more than hundred rotation periods with little numerical diffusion. This is crucially important for Vlasov simulations of magnetized plasmas. Applications of the one- and two-dimensional schemes to electrostatic and electromagnetic Vlasov simulations are presented with some benchmark tests.
Multi-Moment Advection scheme for Vlasov simulations
Takashi Minoshima,Yosuke Matsumoto,Takanobu Amano
Physics , 2012,
Abstract: We present a new numerical scheme for solving the advection equation and its application to the Vlasov simulation. The scheme treats not only point values of a profile but also its zeroth to second order piecewise moments as dependent variables, and advances them on the basis of their governing equations. We have developed one- and two-dimensional schemes and show that they provide quite accurate solutions compared to other existing schemes with the same memory usage. The two-dimensional scheme can solve the solid body rotation problem of a gaussian profile with little numerical diffusion. This is a very important property for Vlasov simulations of magnetized plasma. The application of the scheme to the electromagnetic Vlasov simulation of collisionless shock waves is presented as a benchmark test.
Anosov actions of (n-1)-dimensional Lie groups on n-dimensional manifolds
Takashi Inaba,Shigenori Matsumoto,Yoshihiko Mitsumatsu
Mathematics , 2010,
Abstract: We show that there are no Anosov actions by (n-1)-dimensional unimodular Lie groups on closed n-dimensional manifolds.
Normally contracting Lie group actions
Takashi Inaba,Yoshihiko Mitsumatsu,Shigenori Matsumoto
Mathematics , 2011,
Abstract: We show that there are no normally contracting actions of unimodular Lie groups on closed manifolds.
Page 1 /5996
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.