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Search Results: 1 - 10 of 151616 matches for " H;Ito "
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Zircon fission-track method as a versatile tool for dating pyroclastic rocks
H. Ito
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02891459
Abstract:
Dynamic Characteristics of Selemion CMV-Based IPMC Actuators in High Humidity Environment  [PDF]
H. Ngetha, M. Sasaki, H. Tamagawa, S. Ito, K. Ikeda
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.211006
Abstract:

Electrically-induced bending of Selemion IPMC is caused by the charge induced into the IPMC. This induced charge quantity is susceptible to the absolute humidity of environment. There are two types of charges, the charge causing bending and the rest of charge that causes no bending. In the high humidity environments, where absolute humidity is above 10 gm-3, the quantity of charge causing no bending accounts for the large part of whole charge induced into the Selemion IPMC, while quantity of such charge is negligibly small at the absolute humidity of less than 10 gm-3. Estimating the quantity of those two types of charges individually, we successively analyzed the bending stability of Selemion IPMC at the absolute humidity above 10 gm-3. Consequently, we deduced the following conclusions. 1) There exists a large time delay in the current in response to the voltage input, 2) Current is highly dumping, and 3) Bending behavior is marginally stable under the input of any frequency.

Molecular Dynamics Simulation of Collisions between Hydrogen and Graphite
A. Ito,H. Nakamura
Physics , 2006, DOI: 10.1017/S0022377806005289
Abstract: Hydrogen adsorption by graphite is examined by classical molecular dynamics simulation using a modified Brenner REBO potential. Such interactions are typical in chemical sputtering experiments, and knowledge of the fundamental behavior of hydrogen and graphene in collisional conditions is essential for modeling the sputtering mechanism. The hydrogen adsorption rate is found to be dependent on the incident hydrogen energy and not on graphene temperature. Rather than destroying the graphene, hydrogen incidence at energies of less than 100 eV can be classified into three regimes of adsorption, reflection and penetration through one or more graphene layers. Incidence at the lowest energies is shown to distort the graphene structure.
Effect of Post-Treatment Conditions on the Inactivation of MS2 Bacteriophage as Indicator for Pathogenic Viruses after the Composting Process  [PDF]
Hamidatu S. Darimani, Ryusei Ito, Naoyuki Funamizu, Amadou H. Maiga
Journal of Agricultural Chemistry and Environment (JACEN) , 2018, DOI: 10.4236/jacen.2018.72007
Abstract: A rural model composting toilet system still had some pathogens in the compost after months of operation and hence requires a post-treatment. The aim of the study was to sanitize compost withdrawn from the composting toilet by setting post-treatment conditions. The kinetics inactivation of MS2 bacteriophage, selected as indicator for pathogenic viruses were determined during post-treatment at different temperatures (30°C, 40°C and 50°C) with varying moisture contents (50%, 60% and 70%). As a result, the inactivation rates during the post-treatment were 0.093 - 0.020 h-1, 0.025 - 0.088 h1, 0.447 - 0.100 h-1 at 30°C, 40°C and 50°C respectively. The inactivation rate coefficient (k) values of MS2 bacteriophage depended on higher temperature but not on moisture content.
A Canonical Ensemble Approach to the Fermion/Boson Random Point Processes and its Applications
H. Tamura,K. R. Ito
Mathematics , 2005, DOI: 10.1007/s00220-005-1507-2
Abstract: We introduce the boson and the fermion point processes from the elementary quantum mechanical point of view. That is, we consider quantum statistical mechanics of canonical ensemble for a fixed number of particles which obey Bose-Einstein, Fermi-Dirac statistics, respectively, in a finite volume. Focusing on the distribution of positions of the particles, we have point processes of the fixed number of points in a bounded domain. By taking the thermodynamic limit such that the particle density converges to a finite value, the boson/fermion processes are obtained. This argument is a realization of the equivalence of ensembles, since resulting processes are considered to describe a grand canonical ensemble of points. Random point processes corresponding to para-particles of order two are discussed as an application of the formulation. A statistics of a system of composite particles at zero temperature are also considered as a model of determinantal random point processes.
A Random Point Field related to Bose-Einstein Condensation
H. Tamura,K. R. Ito
Mathematics , 2005, DOI: 10.1016/j.jfa.2006.10.014
Abstract: The random point field which describes the position distribution of the system of ideal boson gas in a state of Bose-Einstein condensation is obtained through the thermodynamic limit. The resulting point field is given by convolution of two independent point fields: the so called boson process whose generating functional is represented by inverse of the Fredholm determinant for an operator related to the heat operator and the point field whose generating functional is represented by a resolvent of the operator. The construction of the latter point field in an abstract formulation is also given.
Lateral extrusion of a cross fitting with a lost core
T. Ohashi,H. Ito,K. Shinozaki,S. Ito
Journal of Achievements in Materials and Manufacturing Engineering , 2007,
Abstract: Purpose: Lateral extrusion process with a lost core for cross fittings is suggested. At first, cavity of tube is filled up by low temperature melting melting alloy. Then low temperature melting material is solidified to be the ‘lost core.’ The third, the material is extruded for lateral direction to be a cross-fittings. After deformation, low temperature melting alloy is melted and removed. The authors discuss its deform mechanism in this paper.Design/methodology/approach: Experiments and numerical analysis with ANSYS9.0.Findings: Extrusion defect is caused at the center of the cross on the inner wall of the pipe because of volume constancy when the branch diameter close to the initial pipe diameter. In such the case, contact between pipe and die surface is unstable and the branch part is not stretched enough, then it causes wrinkles. In such the case, it is better to provide more pressure against the head of branch projection.Research limitations/implications: The effect of the relationship amongst mechanical properties of the pipe and lost core is to be examined in future. We must seek better material for the lost core that is cheaper, easier to remove, clean and safer for the man and environment.Practical implications: This methodology is suitable for production of the hollow products having constant sections for lateral direction.Originality/value: The above result helps the economical production of hollow products with simple equipments.
Analytical and experimental study on lateral extrusion of cross fittings with a lost core
T. Ohashi,H. Ito,K. Shinozaki,S. Ito
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: The authors discuss deform mechanism of lateral extrusion process with a lost core for cross fittings.Outline of the is as follows: At first, cavity of pipe, or channel material, is filled up by liquid of low temperaturemelting material, for instances, low temperature melting alloy, ice (or water) and wax. Then low temperaturemelting material is solidified to be a soluble core of pipe. Authors call this soluble core the ‘lost core [1-4].’ Thethird, the material is compressed longitudinally as a composite billet, and extruded for lateral direction. Afterdeformation, low temperature melting material is melted and removed. The authors think the process is suitablefor production of cross-fittings because such the product has constant sections for lateral direction.Design/methodology/approach: The authors have examined the process with experiments [1] and numericalanalysis with ANSYS9.0.Findings: The feature of the process is revealed. Extrusion defect is caused at the center of the cross on the innerwall of the pipe because of volume constancy when the branch diameter close to the initial pipe diameter. Insuch the case, contact between pipe and die surface is unstable and the branch part is not stretched enough, thenit causes wrinkles. In such the case, it is better to provide more pressure against the head of branch projection.Research limitations/implications: In future work, the effect of the relationship amongst mechanical propertiesof the pipe and lost core is to be examined. In addition, the authors will seek better material for the lost core thatis cheaper, easier to remove, clean and safer for the man and environment.Practical implications: Throughout the above research, authors conclude the suggested process is useful formaking cross fittings, and the process can be useful on the other hollow products.Originality/value: The above result helps design of the economical process for fittings. The process requiresonly simple equipments.
Effectiveness of a Training Program for Improving Public Health Nurses’ Attitudes and Confidence in Dealing with Men Who Have Sex with Men  [PDF]
Asuka Waki, Yumiko H. Nishimura, Mieko Iwai, Gaku Okamoto, Mikiko Ito, Yasuharu Hidaka
Open Journal of Nursing (OJN) , 2017, DOI: 10.4236/ojn.2017.72015
Abstract: Objective: This study examined the effect of an educational intervention on public health nurses’ attitudes and confidence in dealing with men who have sex with men (MSM). In Japan, HIV is primarily transmitted through sexual contact between men, and free HIV testing and counseling are provided by public health nurses. However, because of a lack of education, public health nurses do not often recognize the existence of MSM in daily life. Thus, improving public health nurses’ understanding of MSM is crucial. Methods: This study used a quasi-experimental design to examine public health nurses’ homophobia, confidence in dealing with MSM, and low awareness of MSM in daily life at pre-test, post-test, and 1 and 3 months follow-ups. The intervention comprised a 3-hour training session conducted between November 2012 and September 2013 in the Kinki region. Results: A total of 124 public health nurses participated in the training, 117 of which were allocated to the intervention group; 182 public health nurses who did not participate in the training session were allocated to a control group. Homophobia scores had significantly decreased at post-test, and remained at that low level by the follow-up at 3 months (pre-test to post-test; p = 0.00, post-test to 1 month; p = 0.83, 1 month to 3 months; p = 0.64, pre-test to 3 months; p = 0.00). Confidence in dealing with MSM and recognition of MSM had significantly increased by post-test; these were also maintained by the follow-up at 3 months (pre-test to post-test; p = 0.0, post-test to 1month; p = 0.18, 1 to 3 months; p = 0.44, pre-test to 3 months; p = 0.0). Discussion: While the three-hour training session was short, it was effective for improving attitudes toward MSM and building confidence in dealing with them.
Genome-Wide Identification and Characterization of the Dof Transcription Factor Gene Family in Phaseolus vulgaris L.  [PDF]
Tania Mayumi Ito, Claudia Borsari Trevizan, Tiago Benedito dos Santos, Silvia Graciele Hülse de Souza
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.812218
Abstract: The Dof (DNA-binding with one finger) proteins are a class of plant-specific transcription factors that can trigger several processes involved in plant growth and development, as well as in stress responses. Here, we performed a systematic bioinformatics analysis to characterize all Dof genes in common bean, which included analysis of the genome sequence, conserved protein domains, chromosomal locations, subcellular locations, phylogenetic relationships, gene duplications, and gene expression profiles in different tissues. Bioinformatics analysis revealed 36 putative genes related to PvDof that were classified into seven subfamilies (A, B1, B2, C1, C2, D1, and, D2) by comparative phylogenetic analysis. Based on our genome duplication analysis, a total of 36 genes were found to be distributed on all 11 chromosomes, and they expanded through gene duplication in tandem, suggesting the involvement of segmental duplication events in the evolutionary process. Synteny events and phylogenetic comparisons of the Dof proteins of common bean with those of A. thaliana, O. sativa, and G. max L. led to the identification of several orthologous and paralogous genes, which provided further insight into the diversity of the evolutionary characteristics of genes of this family in other plant species. Expression profiles revealed that most of the PvDof genes were expressed in different tissues, indicating that PvDof genes may be involved in various physiological functions during plant development. The results of this study provide additional information and potential biotechnological resources for further understanding the molecular basis of this gene family and consequently improvement of common bean crops.
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