oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 59 )

2019 ( 247 )

2018 ( 288 )

2017 ( 314 )

Custom range...

Search Results: 1 - 10 of 138873 matches for " K. Takechi "
All listed articles are free for downloading (OA Articles)
Page 1 /138873
Display every page Item
Constitutive equations for granular flow with uniform mean shear and spin fields
K. Takechi,K. Yoshida,T. Arimitsu
Condensed Matter Physics , 2011,
Abstract: Numerical simulations of two-dimensional granular flows under uniform shear and external body torque were performed in order to extract the constitutive equations for the system. The outcome of the numerical simulations is analyzed on the basis of the micropolar fluid model. Uniform mean shear field and mean spin field, which is not subordinate to the vorticity field, are realized in the simulations. The estimates of stresses based on kinetic theory by Lun [Lun, J. Fluid Mech., 1991, vol. 233, 539] are in good agreement with the simulation results for a low area fraction ν=0.1 but the agreement becomes weaker as the area fraction gets higher. However, the estimates in the kinetic theory can be fitted to the simulation results up to ν=0.7 by renormalizing the coefficient of roughness. For a relatively dense granular flow (ν=0.8), the simulation results are also compared with Kanatani's theory [Kanatani, Int. J. Eng. Sci., 1979, vol. 17, 419]. It is found that the dissipation function and its decomposition into the constitutive equations in Kanatani's theory are not consistent with the simulation results.
Constitutive equations for granular flow with uniform mean shear and spin fields
K. Takechi,K. Yoshida,T. Arimitsu
Physics , 2011, DOI: 10.5488/CMP.14.13401
Abstract: Numerical simulations of two-dimensional granular flows under uniform shear and external body torque were performed in order to extract the constitutive equations for the system. The outcome of the numerical simulations is analyzed on the basis of the micropolar fluid model. Uniform mean shear field and mean spin field, which is not subordinate to the vorticity field, are realized in the simulations. The estimates of stresses based on kinetic theory by Lun [Lun, J. Fluid Mech., 1991, 233, 539] are in good agreement with the simulation results for a low area fraction $\nu=0.1$ but the agreement becomes weaker as the area fraction gets higher. However, the estimates in the kinetic theory can be fitted to the simulation results up to $\nu=0.7$ by renormalizing the coefficient of roughness. For a relatively dense granular flow ($\nu=0.8$), the simulation results are also compared with Kanatani's theory [Kanatani, Int. J. Eng. Sci., 1979, 17, 419]. It is found that the dissipation function and its decomposition into the constitutive equations in Kanatani's theory are not consistent with the simulation results.
Transmission of walnut-feeding skills from mother to young in wood mice (Apodemus speciosus)  [PDF]
Reina Takechi, Fumio Hayashi
Advances in Bioscience and Biotechnology (ABB) , 2011, DOI: 10.4236/abb.2011.26061
Abstract: Mammalian feeding behavior is often acquired or improved by learning. Social learners are thought to attain novel information or skills faster and at lower cost than asocial learners. In this study, we examined what types of learning affect the acquisition of efficient feeding behavior by the wood mouse Apodemus speciosus when feeding on large, hard-shelled walnuts. In house cages, naïve mice acquired an efficient feeding manner during the 14-day conditioning to walnuts, suggesting individual trial-and-error learning contributes to their feeding skills. Social factors such as learning from walnuts that have been opened by other individuals or by observing walnut consumption by proficient conspecifics did not affect the rate of acquisition of efficient feeding. However, weaned offspring could eat walnuts more efficiently and frequently if the mother had been given walnuts during her rearing period. Thus, the skill is likely transmitted between the mother and offspring in addition to individual self-learning.
Variations in the Course of the Inferior Gluteal Nerve and Artery: A Case Report and Literature Review  [PDF]
Jun Yan, Masaki Takechi, Jiro Hitomi
Surgical Science (SS) , 2013, DOI: 10.4236/ss.2013.410084
Abstract:

Variations in the course of the inferior gluteal nerve and artery were observed in Japanese cases (4/94 sides). In these variation cases, the inferior gluteal nerve exited the pelvis from the upper edge of the piriformis (suprapiriformis foramen) in 4/4 sides (4.26%). In 2/4 sides (2.13%), the normal inferior gluteal artery was not observed, except that a fine artery exited the pelvis from the inferior piriformis foramen to form an “arch” with the superior gluteal artery under the gluteal maximus in 1/4 side. Moreover, in 1/4 side, a twig of the internal pudendal artery exited pelvis from inferior piriformis foramen and distributed to the surrounding tissues. The present observations of the inferior gluteal nerve and artery course are very important and useful for surgeons and nurses.

Green's function of fully anharmonic lattice vibration
Masateru Takechi,Kazuo Ueda
Physics , 2008, DOI: 10.1143/JPSJ.78.024604
Abstract: Motivated by the discovery of superconductivity in beta-pyrochlore oxides, we study property of rattling motion coupled with conduction electrons. We derive the general expression of the Green's function of fully anharmonic lattice vibration within the accuracy of the second order perturbation of electron-ion interaction by introducing self-energy, vertex-correction, and normalization factor for each transition. Using the expression, we discuss the characteristic properties of the spectral function in the entire range from weakly anharmonic potential to double-well case, and calculate NMR relaxation rate due to the two phonon Raman process.
The Serum Concentration of the Calcium Binding Protein S100B is Positively Associated with Cognitive Performance in Older Adults
Virginie Lam,Matthew A. Albrecht,Ryusuke Takechi,Corey Giles,Anthony P. James,Jonathan K. Foster,John C. L. Mamo
Frontiers in Aging Neuroscience , 2013, DOI: 10.3389/fnagi.2013.00061
Abstract: S100B is a calcium binding peptide produced predominantly by astroglial cells in the central nervous system. S100B paradoxically has neurotrophic and apoptotic effects, dependent on extracellular concentration. This study investigated the relationship between serum S100B levels and neuropsychological performance across a range of cognitive domains in healthy older aged adults. A cohort of 219 participants between the ages of 43 and 84 years (141 female) were recruited. Subjects provided a fasting blood sample for S100B measurement (Mean = 0.24 ng/mL, SD = 0.14) and completed a battery of neuropsychological tests. S100B concentrations (both with and without the covariates of age and sex) were positively associated with the following measures of cognitive performance: digit-symbol coding, Stroop test, and measures of verbal ability. The results from this study show that serum S100B is positively associated with better cognitive performance in healthy older adults.
Maintenance of Normal Stress Tolerance in the Moss Physcomitrella patens Lacking Chloroplastic CuZn-Superoxide Dismutase  [PDF]
Yuya Higashi, Katsuaki Takechi, Hiroyoshi Takano, Susumu Takio
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.65064
Abstract: Superoxide dismutases (SODs) catalyze the dismutation of superoxide and play an important role in reducing oxidative stress in plants. Based on in-gel SOD activity staining, chloroplasts of the moss Physcomitrella patens have two CuZn-SODs as the major SOD isozymes and minor SODs, including a Fe-SOD and two Mn-SODs. To investigate the contribution of chloroplastic SODs to stress tolerance in P. patens, we generated a double mutant lacking chloroplastic CuZn-SOD genes. The mutant did not show any differences in comparison to the wild type based on the growth of protonemata on normal and high-salt media, extractable activities of the other SODs after culture on normal and high-salt media, and inhibition of Fv/Fm under stress conditions (high-salt, high-light, and high-temperature). These results indicate that chloroplastic CuZn-SODs do not play a principal role in oxidative stress tolerance in chloroplasts under the investigated conditions. These findings explain the previously reported unusual response of P. patens to copper deficiency, in which chloroplastic CuZn-SODs are preferentially inactivated but cytosolic CuZn-SODs are unaffected.
Relationship between Social Capital and Cognitive Functions among Community-Based Elderly  [PDF]
Sayuri Takechi, Kimio Yoshimura, Yuko Oguma, Yoshinobu Saito, Masaru Mimura
Advances in Alzheimer's Disease (AAD) , 2017, DOI: 10.4236/aad.2017.62004
Abstract: The concept of social capital encompasses all relationships and networks among people in a local community or society as a whole. It has been found to be associated with the health and daily living status of people. Furthermore, an association between social capital and cognitive functions among the elderly has been suggested in recent years. However, the number of such reports is very few. Hence, the present study aims to evaluate the relationship between social capital and cognitive functions among the elderly living in a local community in Japan. A questionnaire survey was administered to 192 elderly individuals belonging to 10 neighborhood elderly groups. A regression analysis was conducted to determine the relationship between cognitive functions and the level of engagement with the local community, after adjusting for age, gender, and symptoms of depression. Valid responses were collected from 145 participants (mean age: 75.3 years). An analysis of the data concerning the level of engagement with the local community revealed a significant difference in the cognitive function scores between the group of people who indicated that they had someone they could consult (n = 69) and the group that indicated they had no one to consult (n = 76) (regression coefficient: -0.61, p = 0.0038, 95% confidence interval: -1.02 to -0.20). This result indicates the existence of a significant correlation between social capital and cognitive functions of the elderly living in a local community. In future studies, we need to investigate the same with a larger number of participants from a wider geographical area, and by incorporating more indicators for a comprehensive evaluation of social capital.
Produ??o de cará em fun??o de fontes organicas de aduba??o
Rodrigues, Edson Talarico;Sumioka, Adriano Takechi;
Ciência e Agrotecnologia , 2003, DOI: 10.1590/S1413-70542003000400012
Abstract: in this work was evaluated the response of yam (dioscorea alatal.), mimoso clone, to sources and dosis of organic manures. the sowing was established in 1998, november, on a dark clay texture distroferric eutrustox soil, planted with vegetables in last years. it was utilized a ramdomized block experimental design with three replications. the treatments were arranged in fatorial scheme, formed by four organic manuring levels (0, 1, 2 and 3), in relation to three sources (organic compost, enriched compost and bed of chicken manure). the levels 0, 1, 2 and 3 were corresponded to 0, 3, 6 and 9 t.ha-1 in dry matter, of organic compost and bed of chicken manure and to 0, 2, 4 and 6 t.ha-1 of enriched compost. the results indicated that manures don't elevated the rizomes yield, which varied from 17 to 25 t.ha-1, due to the experimental area presented satisfatory levels of fertility to the nutritional yam needs. nevertheless, these manures elevated the production of rizomes which varied from 150 to 600 g, which are best valuated to market.
Care for Alzheimer's Disease
Hiroyuki Umegaki,Hajime Takechi,Hiroko H. Dodge
International Journal of Alzheimer's Disease , 2013, DOI: 10.1155/2013/516852
Abstract:
Page 1 /138873
Display every page Item


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