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ALUMINA POWDER PREPARED BY THE HYDROLYSIS OF AL-PROPOXIDE IN THE SUPERCRITICAL FLUID OF PROPANOL
Nakagawa, Nakagawa, Z.,Enomoto, Enomoto, N.,Nomura, Nomura, S.,Kim, Kim, D.W.,Lim, Lim, D.Y. 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.2 No.4
Al-isopropoxide dispersed into isopropanol was heated in an autoclave above the critical point of propanol(23$5^{\circ}C$, 4.7MPa). Propanol coexisting Al-isopropoxide produced some water during the condensation reaction to isopropul ether, while only propanol did not change under that conditions. This water hydrolyzed Al-isopropoxide to form an alumina at 30$5^{\circ}C$ and 11.0MPa. This alumina had a similar X-ray diffraction pattern of $\chi$-alumina. The heating treatment showed the aluminal transformed directly to ${\alpha}$-alumina around 110$0^{\circ}C$, not to pass via any other intermediate aluminas. The aluminal was named pseudo $\chi$-alumina as a new phase. As-prepared alumina was fine powder of about 20nm, and had about 5% weight loss in the temperature range from 30$0^{\circ}C$ to 65$0^{\circ}C$, and the IR spectral showed no constitutional water.
ASIA SPINE: The Past, Present, and Future
신동아,김영수,Hiroshi Nakagawa,서정근,김세훈 대한척추신경외과학회 2018 Neurospine Vol.15 No.1
The sharing of international academic accomplishment and friendship is important; furthermore, to better understand and anticipate the future, we should look back and remember where we started. Regarding ASIA SPINE, the authors aimed to record how the pioneers of Asian spinal surgery started this spine meeting series more than 20 years ago and that later developed into the present state of the conference. The authors will also explore the possible future of this conference. In June 1996, when Professor Hiroshi Nakagawa organized the 11th Annual Meeting of the Japanese Society of Spinal Surgery, spinal neurosurgeons from Korea and Japan including Professor Young Soo Kim, Professor Jung Keun Suh, and Professor Nakagawa discussed the establishment of a multinational conference on spinal surgery via a partnership between the 2 countries. Finally, from September 18 to 20, 1997, the First Biennial Meeting of the Japan-Korea Conference on Spinal Surgery was held in Nagoya, Japan, with Professor Hiroshi Nakagawa as the first organizing President. From then, a biennial meeting was held every other year in Korea or Japan until 2009. In September 2010, the next generation of spinal neurosurgeons decided to organize the first meeting of ASIA SPINE in Incheon, Korea, in order to represent all Asian spine specialists. This meeting has been since held annually around the region including in Taiwan. Remembering the pioneers in the field of spinal surgery is invaluable and extremely important. The authors hope that interest in ASIA SPINE will further expand to other nations in Asia who have advanced philosophies and refined technologies. We wish ASIA SPINE continued success and the ability to promote prolonged international friendship among the Asian countries.
ASTROMETRIC OBSERVATION OF MIRA VARIABLES WITH VERA
NAKAGAWA, AKIHARU,OMODAKA, TOSHIHIRO,HANDA, TOSHIHIRO,KAMEZAKI, TATSUYA,PROJECT, VERA The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
The calibration of the period luminosity relation (PLR) for Galactic Mira variables is one of the principle aims of the VERA project. We observe $H_2O$ maser emission at 22 GHz associated with Mira variables in order to determine their distances based on annual parallaxes. We conduct multi-epoch VLBI observations over 1-2 years with a typical interval of one month using VERA in order to obtain annual parallaxes with an accuracy of better than than 10%. Recently, the annnual parallax of T Lep was determined to be $3.06{\pm}0.04$ mas corresponding to a distance of $327{\pm}4pc$ (Nakagawa et al., 2014). The circumstellar distribution and kinematics of $H_2O$ masers was also revealed. With accurate distances to the sources, calibrations of K-band absolute magnitudes ($M_K$) can be improved compared to conventional studies. By compiling Mira variables whose distances were determined with astrometric VLBI, we obtained a PLR of $M_K=3.51logP+1.37{\pm}0.07$.
Nakagawa Tsutomu 한국막학회 1994 멤브레인 Vol.4 No.1
The development of separation technology is an important research subject as is clear from its role in the Japanese government's research and development program for basic technology for the next generation(1981~1990). Japan is poor not only in mineral resources but also in energy resources and if a sudden change occurs in oil producing facility or an accident occurs in a nuclear power plant, then energy policy must undergo changes and economic foundations may collapse. Japan has already experienced this. Although, oil prices are stable at present and Japan can import oil at low cost due to the yen appreciation, Japan needs to promote development work for any new energy crisis that may come in the future. This has been the motive for gas separation membrane development in Japan. The study of gas permeation through polymer membranes, which is the basis for membranes for gas separation, at Japanese universities began many years ago, but interest in membranes for gas separation was aroused mainly by the Government. The development of gas separation membranes in Japan started with membranes for oxygen separation on an industrial scale.
Nakagawa, Ryota(나카가와 료타),Yi, Sangjun(이상준),Hirai, Kenji(히라이 켄지),Komatsu, Yukio(코마츠 유키오) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
While finances of local governments deteriorate due to declining birthrate and aging population, local governments are considering the promotion of intensive urban structure as a means to cope with problems such as deterioration of public facilities. In this study, we examined the residents" awareness of the consolidation of public facilities centering on school facilities, and the residents" intention for the formation of a base of community residence and migration. As a result of the survey, there was a general tendency to agree on the consolidation of public facilities and the formation of the bases, but there were many negative opinions on migration, and the elderly tended to settle. In the future, in order to deepen the residents" understanding of the consolidation, it is required to consider the effects of consolidation quantitatively and to consider the phased measures considering the long-term.
Nakagawa Mariko 한국국제경제학회 2020 International Economic Journal Vol.34 No.2
In this study, we analyze how skill transferability from an origin country to a destination country characterized by lower productivity, affects skilled worker migration, by using a multi-country new economic geography model proposed by Gasper et al. (2018). Specifically, we explain how countries that are less frictional in terms of skill transfer attract more high-skilled international migrants. The analysis, which is based on asymmetric skill transferability among countries that can be divided into two groups – those with smooth skill transferability for migrants and those with less smooth skill transferability – finds that countries with smooth skill transferability are more likely to be the industrial core attracting all skilled workers. We also find that lower frictional migration costs from a country with less smooth skill transferability to a country with smooth skill transferability always accelerates industrial agglomeration in the smooth skill transferability core country, while lower frictional migration costs between smooth skill transferability countries does not necessarily accelerate industrial agglomeration in a country with smooth skill transferability due to market crowding effects.
Noninvasive measurement of the tissue oxygen uptake using near-infrared spectroscopy
NAKAGAWA, Emiko,MINAMITANI, Haruyuki,YAMAZAKI, Hajime 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
To determine the change in muscle oxygenation, muscle oxygen saturation and hemoglobin volume was measured transcutaneously with near-infrared spectroscopy (MRS) in the skeleton muscle during cycle ergometry. A new NIRS system is presented for noninvasive evaluation of the tissue oxygenation. To measure more simply, a reflectance sensor that consists of one photodiode (PD) and light emitting diodes (LEDs) with three wavelengths was designed. This instrument monitors and evaluates the regional oxygen saturation (rSO_(2)) and volume of hemoglobin (HbI) using hemoglobin index (HbI) more simply and inexpensively for clinical application. Blood volume and oxygen supply to skeletal muscle is a potentially important factor to maintain muscular oxidative metabolism. The vastus lateralis muscle and the brachioradialis muscle of nine healthy men were monitored by NIRS, using cycle ergometry. The oxygen uptake (VO_(2)) was also monitored to evaluate oxidative metabolism. The calculation results of oxidative metabolism with NIRS correlated with both the VO_(2) and work fate. The purpose of this study was to determine whether the O_(2) consumption measured by NIRS with rSO_(2) and HbI can be a quantitative measure of muscle oxidative metabolism.