1,723,389 research outputs found
Analyzing the physics of radio telescopes and radio astronomy Advances in environmental engineering and green technologies (AEEGT) book series./ [edited by] Kim Ho Yeap, Kazuhiro Hirasawa.
No full textIncludes bibliographical references and index."This book examines the underlying operational principles of radio telescopes and illustrates how signals from the cosmic sources are detected and analyzed. It also expounds on the physics of the celestial objects detected by radio telescopes"--Introduction to radio astronomy and radio telescopes / Kim Ho Yeap, Kazuhiro Hirasawa, Humaira Nisar -- Gaussian optics / Mey Chern Loh -- Microstrip patch antenna / Kim Huat Yeap -- Active integrated antenna / Kim Huat Yeap -- Fundamentals of a radio telescope / Kim Ho Yeap, Kazuhiro Hirasawa.1 online resource (xix, 327 pages)
Mortality risk attributable to wildfire-related PM2·5 pollution: a global time series study in 749 locations
No full text© 2021 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 licenseBackground: Many regions of the world are now facing more frequent and unprecedentedly large wildfires. However, the association between wildfire-related PM2·5 and mortality has not been well characterised. We aimed to comprehensively assess the association between short-term exposure to wildfire-related PM2·5 and mortality across various regions of the world. Methods: For this time series study, data on daily counts of deaths for all causes, cardiovascular causes, and respiratory causes were collected from 749 cities in 43 countries and regions during 2000–16. Daily concentrations of wildfire-related PM2·5 were estimated using the three-dimensional chemical transport model GEOS-Chem at a 0·25° × 0·25° resolution. The association between wildfire-related PM2·5 exposure and mortality was examined using a quasi-Poisson time series model in each city considering both the current-day and lag effects, and the effect estimates were then pooled using a random-effects meta-analysis. Based on these pooled effect estimates, the population attributable fraction and relative risk (RR) of annual mortality due to acute wildfire-related PM2·5 exposure was calculated. Findings: 65·6 million all-cause deaths, 15·1 million cardiovascular deaths, and 6·8 million respiratory deaths were included in our analyses. The pooled RRs of mortality associated with each 10 μg/m3 increase in the 3-day moving average (lag 0–2 days) of wildfire-related PM2·5 exposure were 1·019 (95% CI 1·016–1·022) for all-cause mortality, 1·017 (1·012–1·021) for cardiovascular mortality, and 1·019 (1·013–1·025) for respiratory mortality. Overall, 0·62% (95% CI 0·48–0·75) of all-cause deaths, 0·55% (0·43–0·67) of cardiovascular deaths, and 0·64% (0·50–0·78) of respiratory deaths were annually attributable to the acute impacts of wildfire-related PM2·5 exposure during the study period. Interpretation: Short-term exposure to wildfire-related PM2·5 was associated with increased risk of mortality. Urgent action is needed to reduce health risks from the increasing wildfires. Funding: Australian Research Council, Australian National Health & Medical Research Council.N
리튬 이차 전지용 리튬 망간 산화물 분말의 제조 방법
No full textA method for manufacturing LiMn2O4 powders for use in a lithium secondary battery positive electrode, is provided, in which oxide or carbonate is used as a positive electrode material, a solution is dried at a temperature higher than 150° C., and the resulting matter is put into a reaction furnace in order to be calcinated for a short time, after treating by spontaneous combustion. A certain degree of crystallization of the positive electrode powders can be obtained in the spontaneous combustion process. Thus, a battery having a large charging and discharging capacity and a long life cycle can be manufactured even under a high current condition
Preparation and characterization of Bi-Sr-Ca-Cu-O system superconductor film made by MOCVD
No full text학위논문(석사) - 한국과학기술원 : 무기재료공학과, 1994.2, [ 61 p. ]한국과학기술원 : 무기재료공학과
Anisotropies in Dieclectric, Elasic and Pizoelectric Properties of 0.37Pb(Zn1/3Nb2/3)O3-xPbtiO3-(0.63-x)PbZrO3 Ceramics
No full text
Characterization of tunable bandpass filters and phase shifters using BST thin films for microwave application
No full text
Effects of Mechanical Stress on the Phase Coexistence of Tetragonal and Rhombohedral phases in Pb(Zr,Ti)O3 Ceramics
No full text- …
