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Theoretical Study of C-H σ-Bond Activation and Related Reactions
Sakaki, Shigeyoshi Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.6
Various theoretical studies of σ-bond activation of organic molecules by transition metal complexes arereviewed. In the homolytic σ-bond activation, the d orbital energy level of the central metal is an importantfactor, as well known. At the same time, the electron-withdrawing substituent which stabilizes the sp3 orbitalaccelerates the homolytic σ-bond activation. In the heterolytic C-H σ-bond activation of RH by $MXL_n$, the XHbond formation is an important driving force, where $MRL_n$ and HX are formed as products. The heterolytic σ-bond activation is also understood in terms of the electrophilic attack of the metal center to the substrate.
Sakaki Kazuhiko,Shinkai Shuhei,Ebara Nobuharu,Shimizu Yasuo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Nozzle geometry influences gas dynamics making sprayed particle behavior one of the most important parameters in cold spray process. Gas flows at the entrance convergent section of the nozzle takes place at relatively high temperature and are subsonic. Thus, this region is a very suitable environment for heating spray particle. In this study, numerical simulation and experiments were conducted to investigate the effect of nozzle contour, entrance geometry of nozzle and powder injection position at nozzle on the cold spray process. The process changes were observed through numerical simulation studies and the results were used to find a correlation with coating properties.
Sakaki Seyyed Alireza,Dadvand Koohi Ahmad,Rashidzadeh Mehdi,Sheykhan Mehdi 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.3
Nowadays, waste plastics made a signifi cant environmental problems. Chemical converting of the polymers to valuable liquids is a promising method to solve the problem and make excellent benefi t. This study investigates the utilization of kaolin, a natural resource, for synthesizing zeolite Na-A and signifi cance of the catalyst crystallinity on the catalytic cracking of a 50:50 mixture of polystyrene (PS) and low-density polyethylene (LDPE). This research aims to identify the optimal hydrothermal conditions for producing crystalline zeolite Na-A and evaluate the eff ect of crystallinity of synthesized zeolite Na-A on production of liquids. A central composite design (CCD) model is employed to achieve this, selecting three independent variables: hydrothermal temperature (80, 85, 90, 95 and 100 °C), the molarity of the alkaline solution (NaOH concentration = 1,2,3,4 and 5 molar), and hydrothermal time (8, 10.43, 14, 17.56 and 20 h). Fourier transform infrared spectroscopy (FTIR) determines the functional groups which proves the presence of sodium aluminosilicate in the synthesized zeolite. The crystallinity of the produced zeolite Na-A is evaluated through X-ray diff raction (XRD) analysis, optimizing the results using the CCD model. Scanning electron microscopy (SEM) reveals well-formed cubic crystalline structures of zeolite Na-A. The optimum conditions for polymer cracking are determined as hydrothermal temperature of 89 °C, a hydrothermal time of 13 h, and a NaOH molarity of 2.8, while predicted liquid production was obtained 81%. The analysis of ANOVA indicates that the designed model based on CCD calculations is valid for prediction of the process. Finally, gas chromatography with fl ame ionization detection (GC-FID) is employed to characterize the main resulting value-added components (styrene, toluene, and ethylbenzene) under optimum conditions.
Group Drawing Therapy as Developed from the Tree Test
Tamotu Sakaki,Noriko Koyama,Satoko Kunihiro 한국예술치료학회 2011 한국예술치료학회지 Vol.11 No.2
Group drawing therapy is performed in various ways, depending on its subject and purpose. Some types of group therapy provide fairly loose frameworks requiring no mandatory participation, while others are stricter in this requirement. In this presentation, we intend to introduce the former therapeutic method. Looser therapeutic frameworks are likely to promote more positive participation of clients. In this regard, the purposes of our therapeutic method are to give each participant experience as a member of a group and to encourage self-insight through his/hers interactions with the therapist and other participants. In this way, it is expected that the therapist may be able to understand the state of each participant’s mind through his/her drawing and become aware, by means of language, what is described in the drawing.
Robotics-Mechatronics Design Competition in Kyushu Area, Japan
Taisuke Sakaki,Takanori Kiyota,Hitoshi Kino,Shinichi Sagara,Ryuichi Oguro,Shunji Moromugi,Keiji Imado,Hidetaka Ikeuchi,Manabu Fukushima,Takeshi Ikeda,Kanta Aoki,Nobuhiro Ushimi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We describe a unique competition based on the novel concept of robotics and mechatronics products that included evaluation of the products’engineering function and interface design. Seventy-seven students of eleven teams from seven universities in the Kyushu area participated in the competition, whose subject was “Health care, life supporting and communication or other technical aids for the elderly or disabled.”Many of the plans presented ideas that balanced function and design, showing the results of collaboration among students studying engineering and students studying product design.
Samane Sakaki,Ahad Sahragard 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.4
Functional response is basic to any investigation of predator–prey relationships. In this study, the functional response of female Scymnus syriacus Marseul (Col.: Coccinellidae) to different densities (10, 20, 40, 60, 80,100) of third instar nymphs of Aphis gossypii Glover as prey was studied in an open patch experiment in a growth chamber (25 °C, 65±5% RH and a photoperiod of 16L:8D h ). Using logistic regression, a type II functional response for female Scymnus syriacus was determined. The searching efficiency (a') and handling time (T_h) of the female predator using non linear least-square regression were estimated as 0.0769±0.0136 h^(−1) and 0.3103±0.0438 h., respectively. Mean times required for the female predator to settle in a patch were 10.20±4.28, 6.58±2.58, 12.58±4.50, 4.53±1.48, 5.14±2.59, 3.87±3.52 min at different prey densities, respectively. Maximum theoretical predation rate (T/T_h) estimated by Rogers' model for the female predator was 77.34. The proportion of female predators remaining in open patches at the end of the experiment was dependent on prey density (R^2=0.876). The type of functional response obtained here agrees with studies on this predator in closed patches.
Taisuke Sakaki,Kazuhiko Tsuruta,Yong-Kwun Lee,Nobuhiro Ushimi,Koji Murakami,Yoshimi Matsunoo,Yutaka Ichinose,Tshihiko Shimokawa,Yuko Kamiya,Osamu Kikima,Kanta Aoki,Shinya Morishita,Takehiro Tashiro,Hi 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
The Human Robotics Research Center at Kyushu Sangyo University was established in 2013 as a practical center for the study of robots designed for rehabilitation and care-support. The HRRC seeks to implement robots intended for the medical and care fields to address problems in those fields. We have focused on the development of rehabilitation robots for spinal cord injury patients. Here, we present three different robots we have developed for standing-motion training, primary-walking-pattern training, and practical-walking training.