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Search Results: 1 - 10 of 129 matches for " Takahito KOBA YASHI "
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Newly recorded species of Inocybe collected from Liaoning and Inner Mongolia

FAN Yu-Guang,BAU Tolgor,Takahito KOBA YASHI,

菌物学报 , 2013,
Abstract: 丝盖伞属Inocybe是一个较大的属,目前对中国丝盖伞属真菌的种类和分布知之甚少。在中国丝盖伞科分类学研究过程中,发现采自东北的3个分类群尚未有文献记载,它们是褐鳞丝盖伞原变型I. cervicolor f. cervicolor、土味丝盖伞蓝紫变种I. geophylla var. violacea和厚囊丝盖伞I. pachypleura。根据中国的材料对此3种进行了详细描述,并提供了每个种的线条图和必要的讨论。
Effect of Virgin Coconut Meal (VCM) on the Textural, Thermal and Physico Chemical Properties of Biscuits  [PDF]
Yashi Srivastava
Food and Nutrition Sciences (FNS) , 2010, DOI: 10.4236/fns.2010.12007
Abstract: Biscuits were prepared by incorporating virgin coconut meal (VCM) into refined wheat flour (maida) at 5-25% level and evaluated for physical, chemical, nutritional, textural and sensory attributes. All the prepared biscuits had high protein and fiber contents as compared to control (100% refined wheat flour based product). With the incorporation of VCM, hardness and toughness of dough increased while there was a decrease in stickiness and adhesiveness values. Incorporation of VCM had a significant effect on color values of biscuits as the concentration of VCM was increased. The values of L* decreased while those for a* and b* increased. Sensory analysis revealed that 15% VCM biscuits were the most acceptable. The Differential scanning calorimetry (DSC) analysis revealed that the onset (To) decreased while end set (Tc) and enthalpy of gelatinization (ΔH) increased with the increase level of VCM.
FEM Modeling of Crack Propagation in a Model Multiphase Alloy
Lihe QIAN,Seishi NISHIDO,Hiroyuki TODA,Toshiro KOBAYASHI,

材料科学技术学报 , 2006,
Abstract: In this paper, several widely applied fracture criteria were first numerically examined and the crack-tip-region Jintegral criterion was confirmed to be more applicable to predict fracture angle in an elastic-plastic multiphase material. Then, the crack propagation in an idealized dendritic two-phase Al-7%Si alloy was modeled using an elastic-plastic finite element method. The variation of crack growth driving force with crack extension was also demonstrated. It is found that the crack path is significantly influenced by the presence of α-phase near the crack tip, and the crack growth driving force varies drastically from place to place. Lastly, the simulated fracture path in the two-phase model alloy was compared with the experimentally observed fracture path.
GONG Bo LAI Zuhan Northeast University of Technology,Shenyang,China NIINOMI Mitsuo,KOBA YASHI Toshiro Toyohashi University of Technology,Toyohashi Japan
金属学报(英文版) , 1993,
Abstract: A new process to refine the microstructure of α+βtvpe Ti alloys was developed by usinghydrogen as a temporary alloying element.It involves hydrogenating the alloys below thehydrogenated β transus temperature about 0-40 K,air cooling to room temperature and thendehydrogenating at 948 K.Ti-6AI-4V and Ti-5AI-2.5Fe alloys treated hy this new processshow much refined microstructures,and the yield strength,ultimate strength as well as theelongation increase 8—15,5—13 and 7—14% respectively

LIU Pilin,WANG Zhongguang,WANG Wenlong,TODA Hiroyuki,KOBA YASHI Toshiro,

金属学报 , 1997,
Abstract: 通过对SiCw/6061Al与SiCp/2024Al复合材料的蠕变及循环蠕变行为的对比研究发现,虽然SiCw/6061Al复合材料与SiCp/2024Al复合材料相比有较高的蠕变抗力,但其蠕变门槛应力却较低,两种材料在298℃都显示循环蠕变减速行为,但后者更明显,SiCw/6061Al复合材料的稳态循环蠕变速率随卸载量增加首先降低然后升高,而SiCp/2024Al复合材料的稳态循环蠕变速率却随卸载
Glycerol-Induced Aggregation of the Oligomeric L-Asparaginase II from E. coli Monitored with ATR-FTIR
Koba Adeishvili
International Journal of Molecular Sciences , 2001, DOI: 10.3390/i2020109
Abstract: In this paper attenuated total reflectance Fourier transform infrared spectroscopy has been employed for the study of the structural composition of aggregates of the oligomeric L-asparaginase II from E.coli formed in the presence of glycerol after the induction of refolding of the protein. Apart from the perfect coincidence of the secondary structure composition of EcA2 as determined by FTIR and crystallography [1], it has also been shown that secondary structure of protein in asparaginase deposits is similar to that of the native conformation: 20.7% extended, 22.3% disordered, 31.4% helix and 25.6% turn/bend/β sheet. Certain structural similarities in the range of experimental error was observed for all three protein deposits presented in this paper, indicating a common structural basis for the composition of this types of aggregates. It is concluded that in the constitution of such precipitates, a partially folded (molten globule like) state(s) is involved, and its stabilisation is a key factor leading to the aggregation. The results presented in this paper might serve to be a good explanation and an excellent basis for the fundamental theory of protein (oligomers) precipitation by osmotic substances.
On $L^{3,\infty}$-stability of the Navier-Stokes system in exterior domains
Hajime Koba
Mathematics , 2015,
Abstract: This paper studies the stability of a stationary solution of the Navier-Stokes system with a constant velocity at infinity in an exterior domain. More precisely, this paper considers the stability of the Navier-Stokes system governing the stationary solution which belongs to the weak $L^3$-space $L^{3,\infty}$. Under the condition that the initial datum belongs to a solenoidal $L^{3 , \infty}$-space, we prove that if both the $L^{3,\infty}$-norm of the initial datum and the $L^{3,\infty}$-norm of the stationary solution are sufficiently small then the system admits a unique global-in-time strong $L^{3,\infty}$-solution satisfying both $L^{3,\infty}$-asymptotic stability and $L^\infty$-asymptotic stability. Moreover, we investigate $L^{3,r}$-asymptotic stability of the global-in-time solution. Using $L^p$-$L^q$ type estimates for the Oseen semigroup and applying an equivalent norm on the Lorentz space are key ideas to establish both the existence of a unique global-in-time strong (or mild) solution of our system and the stability of our solution.
Nonchaotic Stagnant Motion in a Marginal Quasiperiodic Gradient System
Takahito Mitsui
Physics , 2008, DOI: 10.1103/PhysRevE.78.026206
Abstract: A one-dimensional dynamical system with a marginal quasiperiodic gradient is presented as a mathematical extension of a nonuniform oscillator. The system exhibits a nonchaotic stagnant motion, which is reminiscent of intermittent chaos. In fact, the density function of residence times near stagnation points obeys an inverse-square law, due to a mechanism similar to type-I intermittency. However, unlike intermittent chaos, in which the alternation between long stagnant phases and rapid moving phases occurs in a random manner, here the alternation occurs in a quasiperiodic manner. In particular, in case of a gradient with the golden ratio, the renewal of the largest residence time occurs at positions corresponding to the Fibonacci sequence. Finally, the asymptotic long-time behavior, in the form of a nested logarithm, is theoretically derived. Compared with the Pomeau-Manneville intermittency, a significant difference in the relaxation property of the long-time average of the dynamical variable is found.
On a finite element approximation of the Stokes problem under leak or slip boundary conditions of friction type
Takahito Kashiwabara
Mathematics , 2010,
Abstract: A finite element approximation of the Stokes equations under a certain nonlinear boundary condition, namely, the slip or leak boundary condition of friction type, is considered. We propose an approximate problem formulated by a variational inequality, prove an existence and uniqueness result, present an error estimate, and discuss a numerical realization using an iterative Uzawa-type method. Several numerical examples are provided to support our theoretical results.
String operations on rational Gorenstein spaces
Takahito Naito
Mathematics , 2013,
Abstract: F\'{e}lix and Thomas developed string topology of Chas and Sullivan on simply-connected Gorenstein spaces. In this paper, we prove that the degree shifted homology of the free loop space of a simply-connected ${\mathbb Q}$-Gorenstein space with rational coefficient is a non-unital and non-counital Frobenius algebra by solving the up to constant problem. We also investigate triviality or non-triviality of the loop product and coproduct of particular Gorenstein spaces.
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