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Search Results: 1 - 10 of 1437 matches for " Taisuke Yamaguchi "
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Synthesis of Titanium Phosphates with Additives and Their Powder Properties for Cosmetics  [PDF]
Hiroaki Onoda, Taisuke Yamaguchi
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.31003
Abstract: As a white pigment, titanium oxide is used for cosmetic application. This oxide is well known to have the photo catalytic activity. Therefore a certain degree of sebum is decomposed by the ultraviolet radiation in sunlight. In this work, titanium phosphates were prepared with additives (urea, sodium lactate, and glycerin) as a novel white pigment. Their chemical composition, powder properties, photo catalytic activity, moisture retention, and smoothness were studied. These white pigments had little photo catalytic activity. The addition of sodium lactate and glycerin improved the moisture retention of titanium phosphates. The slipping resistance of samples became small by the addition of sodium lactate and glycerin. The roughness of samples became small by heating.
Preparation of Titanium Phosphates with Sodium Triphosphate in Hydrothermal Process and Their Powder Properties for Cosmetics  [PDF]
Hiroaki Onoda, Taisuke Yamaguchi
Advances in Materials Physics and Chemistry (AMPC) , 2013, DOI: 10.4236/ampc.2013.31001
Abstract:

As a white pigment, titanium oxide is used for cosmetic application. This oxide is well known to have the photo catalytic activity. Therefore, a certain degree of sebum on the skin is decomposed by the ultraviolet radiation in sunlight. In this work, titanium phosphates were prepared with titanium chloride and sodium triphosphate in hydrothermal process as a novel white pigment. Their chemical composition, powder properties, photo catalytic activity, color phase, and smoothness were studied. The obtained phosphates had little photo catalytic activity. The particle size of phosphate pigments consisted a normal distribution at 2 μm by the hydrothermal treatment for 4 and 8 hours. The slipping resistance of samples became small by the hydrothermal treatment.

Relativistic Remnants of Non-Relativistic Electrons
Taro Kashiwa,Taisuke Yamaguchi
Physics , 2014, DOI: 10.1093/ptep/ptu126
Abstract: Electrons obeying the Dirac equation are investigated under the non-relativistic $c \mapsto \infty$ limit. General solutions are given by derivatives of the relativistic invariant functions whose forms are different in the time- and the space-like region, yielding the delta function of $(ct)^2 - x^2$. This light-cone singularity does survive to show that the charge and the current density of electrons travel with the speed of light in spite of their massiveness.
Case Report: Asymptomatic Osteosarcoma  [PDF]
Reiko Yamaguchi, Seiichi Matsumoto, Keisuke Ae, Taisuke Tanizawa, Tabu Gokita, Keiko Hayakawa, Yuki Funauchi, Munehisa Kito, Hirotada Ishii, Noriko Motoi
Case Reports in Clinical Medicine (CRCM) , 2015, DOI: 10.4236/crcm.2015.412075
Abstract: Osteosarcomas are primary malignant tumors that are characterized by the production of osteoid or immature bone. However they are the most common primary malignant tumor of bone in adolescents and young adults, the diagnosis of osteosarcoma is often delayed. It is because of the rarity of population, the variety of findings, nonspecific symptoms and so on. A 46-year-old male patient had left knee pain for 3 months without any symptoms in his right knee. At a nearby clinic, X-ray of his healthy side was taken by chance. The irregular bone formation was however seen in the metaphysis of the distal femur with spreading into the soft tissues. No abnormal findings were pointed out at his left side knee. A diagnosis of pleomorphic sarcoma was made by incisional biopsy. Pulmonary CT showed multiple nodules which were considered as multiple lung metastases. He was diagnosed as right femoral sarcoma, clinical stage IV (T1N0M1a) by TNM classification. He underwent preoperative chemotherapy, followed by limb-saving operation. No preoperative complaints were found in his left knee. Final diagnosis of surgically resected specimen was osteoblastic osteosarcoma which showed neoplastic osteoid formation within pleomorphic malignant cells. However, osteosarcomas occurred in adult populations are sometimes occurred as a secondary neoplasms, he had a history of diabetes but no other medical history, such as radiation therapy for a solid cancer, Paget’s disease, other benign bone lesions or inherited conditions. As far as our knowledge, we believe that this is a first case report of asymptomatic incidental osteosarcoma.
Structure-function relationship of γ-secretase
Tomita Taisuke
Molecular Neurodegeneration , 2012, DOI: 10.1186/1750-1326-7-s1-l5
Abstract:
Numerically exact O($N^{7/3}$) method for large-scale electronic structure calculations
Taisuke Ozaki
Physics , 2010,
Abstract: An efficient low-order scaling method is presented for large-scale electronic structure calculations based on the density functional theory using localized basis functions, which directly computes selected elements of the density matrix by a contour integration of the Green function evaluated with a nested dissection approach for resultant sparse matrices. The computational effort of the method scales as O($N(\log_2N)^2$), O($N^{2}$), and O($N^{7/3}$) for one, two, and three dimensional systems, respectively, where $N$ is the number of basis functions. Unlike O($N$) methods developed so far the approach is a numerically exact alternative to conventional O($N^{3}$) diagonalization schemes in spite of the low-order scaling, and can be applicable to not only insulating but also metallic systems in a single framework. It is also demonstrated that the nested algorithm and the well separated data structure are suitable for the massively parallel computation, which enables us to extend the applicability of density functional calculations for large-scale systems together with the low-order scaling.
Linear scaling Krylov subspace method for large scale {\it ab initio} electronic structure calculations of metals
Taisuke Ozaki
Physics , 2005, DOI: 10.1103/PhysRevB.74.245101
Abstract: An efficient and robust linear scaling method is presented for large scale {\it ab initio} electronic structure calculations of a wide variety of materials including metals. The detailed short range and the effective long range contributions to the electronic structure are taken into account by solving an embedded cluster defined in a Krylov subspace, which provides rapid convergence for not only insulators but also metals. As an illustration of the method, we present a large scale calculation based on density functional theory for a palladium cluster with a single iron impurity.
Improving Lower Bound on Opaque Set for Equilateral Triangle
Taisuke Izumi
Computer Science , 2015,
Abstract: An opaque set (or a barrier) for $U \subseteq \mathbb{R}^2$ is a set $B$ of finite-length curves such that any line intersecting $U$ also intersects $B$. In this paper, we consider the lower bound for the shortest barrier when $U$ is the unit equilateral triangle. The known best lower bound for triangles is the classic one by Jones [Jones,1964], which exhibits that the length of the shortest barrier for any convex polygon is at least the half of its perimeter. That is, for the unit equilateral triangle, it must be at least $3/2$. Very recently, this lower bounds are improved for convex $k$-gons for any $k\geq 4$ [Kawamura et al. 2014], but the case of triangles still lack the bound better than Jones' one. The main result of this paper is to fill this missing piece: We give the lower bound of $3/2 + 5 \cdot 10^{-13}$ for the unit-size equilateral triangle. The proof is based on two new ideas, angle-restricted barriers and a weighted sum of projection-cover conditions, which may be of independently interest.
The Acquisition of Complex Structures: The Case of Child ESL  [PDF]
Yumiko Yamaguchi
Open Journal of Modern Linguistics (OJML) , 2013, DOI: 10.4236/ojml.2013.33030
Abstract:

This study examines how complex linguistic structures are acquired in child English as a second language. The spontaneous speech producing by a Japanese primary school child, learning English in a naturalistic environment, was audio-recorded regularly over two years and the development of complex syntactic structures containing subordinate clauses was compared with the acquisition of other English morphosyntactic structures as represented within Processability Theory (PT) (Pienemann, 1998; Pienemann, Di Biase, & Kawaguchi, 2005). Although PT predicts that subordination is acquired at the highest stage in processability hierarchy, the results in this longitudinal study show that some of the subordinate constructions emerge at earlier stages in child ESL acquisition.

Comparison of Malignant Bone Treatments for Reuse  [PDF]
Masaki Yazawa, Taisuke Mori, Kazuo Kishi
Surgical Science (SS) , 2013, DOI: 10.4236/ss.2013.41009
Abstract:

The After cancer resection including bone, recently, bone resected with cancer has been considered to be reusable. We newly examined superheated steam treatment for bone reuse and compared it to existing treatments. Forty male C3H/HeN mice were used to establish a model of mandible invasion by oral squamous cell carcinoma (OSCC). The mice were sacrificed to harvest the tumor invading mandible bone. The resected tumor with mandible bone was treated by one of four kinds of treatment, no treatment for the control, the Pasteur method, liquid nitrogen treatment, micro-wave treatment and superheated steam treatment. After each treatment, the resected bone was transplanted into a syn-geneic mouse back. Eight weeks after transplantation, the mice were sacrificed and evaluated pathologically. Grafted tumors showed recurrence: 7/7 in the control, 6/8 in the liquid nitrogen treatment, 1/8 the microwave treatment and 2/8 the superheated steam treatment groups. No recurrence, on the other hand, was observed in the Pasteur method (0/8). The Pasteur method is a good treatment to remove malignant cells.

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