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The role of curvature in silica mesoporous crystals
Miyasaka, Keiichi,Garcia Bennett, Alfonso,Han, Lu,Han, Yu,Xiao, Changhong,Fujita, Nobuhisa,Castle, Toen,Sakamoto, Yasuhiro,Che, Shunai,Terasaki, Osamu The Royal Society 2012 Interface focus Vol.2 No.5
<P>Silica mesoporous crystals (SMCs) offer a unique opportunity to study micellar mesophases. Replication of non-equilibrium mesophases into porous silica structures allows the characterization of surfactant phases under a variety of chemical and physical perturbations, through methods not typically accessible to liquid crystal chemists. A poignant example is the use of electron microscopy and crystallography, as discussed herein, for the purpose of determining the fundamental role of amphiphile curvature, namely mean curvature and Gaussian curvature, which have been extensively studied in various fields such as polymer, liquid crystal, biological membrane, etc. The present work aims to highlight some current studies devoted to the interface curvature on SMCs, in which electron microscopy and electron crystallography (EC) are used to understand the geometry of silica wall surface in bicontinuous and cage-type mesostructures through the investigation of electrostatic potential maps. Additionally, we show that by altering the synthesis conditions during the preparation of SMCs, it is possible to isolate particles during micellar mesophase transformations in the cubic bicontinuous system, allowing us to view and study epitaxial relations under the specific synthesis conditions. By studying the relationship between mesoporous structure, interface curvature and micellar mesophases using electron microscopy and EC, we hope to bring new insights into the formation mechanism of these unique materials but also contribute a new way of understanding periodic liquid crystal systems.</P>
A Tennis-court-sized Reflector for Communications Satellite-Use for Engineering Test Satellite VIII
Miyasaka, Akihiro,Shintate, Kyoji,Tsujihata, Akio,Tsutsumi, Yuji,Yoshihara, Makoto 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-
Large deployable reflector (LDR) is state-of-the-arts technology in communication satellites to achieve some satellite communication services. Government agencies of Japan are planning some experiments on communication and broadcasting services via satellite. Engineering Test Satellite VIII (ETS-VIII) will be launched in 2004, and demonstrated satellite voice communication by using cellular phones and high-quality audio broadcasting. An antenna system is combination of the LDR and active-phased-array feeders. The LDR, 20 m along its major axis, based on a modular-mesh concept in which structure consists of several basic modules has extensibility. In order to develop the LDR, the design points on surface accuracy and electrical performance are evaluated. A surface error caused by the assembly of multiple modules was evaluated. The surface accuracy measured data compared with analysis results. Hence, the surface of the LDR was accurate enough within the system requirement. The electrical performance, especially, passive intermodulation (PIM) was measured by using a 7-module reflector. The measured PIM is so small that the LDR is satisfied the system requirements.
Miyasaka, Yoko,Barnes, Marion E,Petersen, Ronald C,Cha, Stephen S,Bailey, Kent R,Gersh, Bernard J,Casaclang-Verzosa, Grace,Abhayaratna, Walter P,Seward, James B,Iwasaka, Toshiji,Tsang, Teresa S M Academic Press 2007 European Heart Journal Vol. No.
<P>AIMS: To estimate the incidence of dementia after the first atrial fibrillation (AF), and its impact on survival in a community-based cohort. METHODS AND RESULTS: Olmsted County, Minnesota adult residents diagnosed with first AF during 1986-2000 were identified, and followed until 2004. The primary outcome was new detection of dementia. Interim stroke was censored in the analyses. Of 2837 subjects (71 +/- 15 years old) diagnosed with first AF and without any evidence of cognitive dysfunction or stroke at the time of AF onset, 299 were diagnosed with dementia during a median follow-up of 4.6 years [interquartile (IQR) range 1.5-7.9 years], and 1638 died. The Kaplan-Meier cumulative rate of dementia was 2.7% at 1 year and 10.5% at 5 years. After adjustment for age and sex, dementia was strongly related to advancing age [hazard ratio (HR)/10 years, 2.8; 95% confidence interval (CI), 2.5-3.2], but did not vary with sex (P = 0.52). The occurrence of post-AF dementia was associated with significantly increased mortality risk (HR 2.9; 95% CI 2.5-3.3), even after adjustment for multiple comorbidities, and did not vary with age (P = 0.75) or sex (P = 0.33). CONCLUSION: Dementia appeared common following the diagnosis of first AF, and was associated with premature death.</P>
초음파현미경을 이용한 나노 구조 박막 시스템의 비파괴평가
Chiaki Miyasaka,박익근(Ik Keun Park),박태성(Tae Sung Park) 한국비파괴검사학회 2010 한국비파괴검사학회지 Vol.30 No.5
최근 재료, 생물의학(biomedicine), 음향, 전자 등 다양한 분야에서 나노 구조를 갖는 박막 기술이 도입되면서 박막 계면의 수명과 내구성 확보를 위한 초고주파수의 초음파현미경을 이용한 정량적인 비파괴적 접합평가에 관한 연구가 큰 이슈가 되고 있다. 본 연구에서는 초음파의 집속, 누설탄성표면파의 발생과 V(z) 곡선의 시뮬레이션 그리고 초고주파수 음향 이미징 기법을 이용하여 나노 스케일 구조를 갖는 박막 시험편의 접합계면을 평가하였다. V(z) 곡선의 컴퓨터 시뮬레이션을 통하여 접합계면에 존재하는 미세 결함(디라미네이션 등)의 검출 감도를 추정할 수 있었으며, 1 GHz의 초고주파수 디포커싱 모드로 박막 시험편의 접합계면에 존재하는 나노 스케일의 미세 결함을 음향 이미지로 가시화 할 수 있어 나노 구조를 갖는 박막의 접합계면의 비파괴평가에 초음파현미경이 매우 유용함을 알 수 있었다. In recent years, as nano scale structured thin film technology has emerged in various fields such as the materials, biomedical and acoustic sciences, the quantitative nondestructive adhesion evaluation of thin film interfaces using ultra high frequency scanning acoustic microscopy(SAM) has become an important issue in terms of the longevity and durability of thin film devices. In this study, an effective technique for investigating the interfaces of nano scale structured thin film systems is described, based on the focusing of ultrasonic waves, the generation of leaky surface acoustic waves(LSAWs), V(z) curve simulation and ultra high frequency acoustical imaging_ Computer simulations of the V(z) curve were performed to estimate the sensitivity of detection of micro flaws(i.e., delamination) in a thin film system. Finally, experiments were conducted to confirm that a SAM system operating at a frequency of 1 GHz can be useful to visualize the micro flaws in nano structured thin film systems.
Surgical management of the cases with both biliary and duodenal obstruction
Yoshihiro Miyasaka,Takao Ohtsuka,Vittoria Vanessa Velasquez,Yasuhisa Mori,Kohei Nakata,Masafumi Nakamura 소화기인터벤션의학회 2018 Gastrointestinal Intervention Vol.7 No.2
Endoscopic management is presently the recommended first-line of treatment for biliary strictures. However, surgery still has an important role especially for biliary obstruction (BO) with duodenal obstruction. Even though endoscopic treatment for concurrent BO and gastric-outlet obstruction has been proposed, it is still not widespread. Duodenal obstruction is often associated with malignant BO which makes endoscopic treatment more challenging. Biliary and gastrointestinal double bypass with Roux-en-Y hepaticojejunostomy and gastrojejunostomy is the most common surgical intervention for malignant biliary and gastric-outlet obstruction. A variety of procedures of biliary bypass and gastrointestinal bypass have been reported. According to several studies, mortality rates range from 0% to 7%, while morbidity rates range from 3% to 50%. Higher morbidity was observed in symptomatic patients caused by the disease. Most common morbidity after double bypass was delayed gastric emptying. Recurrence of BO and gastric-outlet obstruction was less frequently seen after surgical bypass compared to after endoscopic treatment. Minimally invasive approach has been applied to double bypass. Studies showed that laparoscopic double bypass has a shorter hospital stay and reduced postoperative pain; however, due to its technical demand, it is still presently an uncommon procedure. Robotic bypass surgery may resolve this issue in the future. Further analyses of outcomes of both surgical and endoscopic treatments are necessary to establish better and suitable palliation options for concurrent biliary and duodenal obstruction caused by unresectable malignant tumors.