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High-frequency Induction Heating for Tiny Foreign Metals
Shinya Kurachi,Naoki Yamamoto,Hiroaki Yamada,Toshihiko Tanaka,Eiji Hiraki,Yukiharu Yamada,Tatsuya Nagao,Yasuhiro Miyake,Yujiro Noda 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The anxiety of tiny metal contamination into resin materials in the manufacturing process has become one of the serious issues. Because it may often cause of overheat in lithium-ion batteries, flat panel displays, and so on. Therefore, a study on detecting method of the tiny metals is a significant issue. The authors have been investigating the high-frequency induction heating (IH) based approach for tiny metals detection. In this paper, effective magnetic circuit design and IH conditions are discussed and demonstrated from theoretical and experimental point of view.
GCT Technologies and their applications
Kazuhiro Kurachi,Kazunori Taguchi,Gourab.Majumdar 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Continuous development and evermore demanding applications, have led to significant improvements in high power semiconductors devices to date. High power devices such as GTO (Gate Turn Off Thyristor), GCT (Gate Commutated Turn Off Thyristor) and HVIGBT (High Voltage Insulated Gate Bipolar Transistor) module have been widely adopted in large capacity power electronics equipment such as electric railway, power management, power transportation and industrial fields. However, long term reliability is expected from these applications and from the viewpoint of environmental management, reduction in equipment size and improvement in efficiency are required. Until 20 years ago, the mainstream device for high power electronics was the GTO but since the late 1990s, they have been replaced with new devices such as GCTs and HVIGBTs. Here we focus on the press-pack GCT with a hermetic structure that can be expected to have a long lifetime and report on some of the applied technologies and their application.
Tomiki Sumiyoshi,Yasuhiro Kawasaki,Michio Suzuki,Yuko Higuchi,Shimako Nishiyama,Masayoshi Kurachi 대한정신약물학회 2008 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.6 No.2
Research into first episode psychosis (FEP) is a growing field in psychiatry. In this paper, the authors provide an overview of neurocognitive findings and therapeutic approaches indicated for patients with FEP. Focus will be placed on evidence from neuropsychological assessment and brain imaging of electrophysiological activities, as well as the ability of some psychotropic drugs, such as second generation antipsychotics, to improve functional outcome. Efforts to identify biological signals characteristic of FEP are expected to facilitate early intervention into schizophrenia and related disorders.
Photolarvicidal effect of curcuminoids from Curcuma longa Linn. against Aedes aegypti larvae
Larissa Marila de Souza,Natalia Mayumi Inada,Francine Perri Venturini,Christian C. Carmona-Vargas,Sebastião Pratavieira,Kleber Thiago de Oliveira,Cristina Kurachi,Vanderlei Salvador Bagnato 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.1
In this study we evaluated the photolarvicidal activity of different curcuminoids forms: Natural Turmeric (NT), Synthetic Curcumin (SC) and Synthetic curcumin formulated with sucrose (SCS) against Aedes aegypti larvae which is the major vector of dengue, chikungunya and Zika viruses. Two strategies for curcuminoids delivery were chosen for the experiments: (i) larvae exposed to aqueous solutions of curcuminoids in the concentration range of 5–25 mg/L (w/v) and (ii) larvae exposed to two different types of curcuminoids carriers (pet food). Phototoxic effects of the curcuminoids were evaluated by counting the dead larvae after sunlight exposure, at irradiance range of 30–60 mW/cm 2 . The characteristic photobleaching time for each curcuminoids in solution was also determined in order to infer the safety of these molecules in the natural environment. Curcuminoids solutions showed high photolarvicidal activity after 30 min of sunlight irradiation, with LC 50 values of 20.0, 11.6 and 2.2 mg/L for NT, SC and SCS, respectively. The curcuminoids carriers, despite showing high mortality (about 90%), presented photodynamic activity only after 8 h of sunlight irradiation. The curcuminoids remained in the aqueous solution for up to 3 h; subsequently, the maximum absorption peak of these pigments was completely modified. The characteristic photobleaching time for each sample was 6, 32 and 60 min for NT, SC and SCS. These original and relevant results show that the combination of curcuminoids pigments with sunlight establishes an extremely effective alternative for Ae. aegypti larvae control, ensuring high environmental safety due to the low persistence of these molecules in the presence of light.