The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Kazunari Shibata - One of the best experts on this subject based on the ideXlab platform.
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Sunspot Drawings by Japanese Official Astronomers in 1749-1750
Publications of the Astronomical Society of Japan, 2018Co-Authors: Hisashi Hayakawa, Kiyomi Iwahashi, Masashi Fujiyama, Toshiki Kawai, Shin Toriumi, Hideyuki Hotta, Haruhisa Iijima, Shinsuke Imada, Harufumi Tamazawa, Kazunari ShibataAbstract:Sunspot observations with telescopes in 18th century were carried out in Japan as well. One of these sunspot observations is recorded in an account called Sansaizusetsu narabini Kansei irai Jissoku Zusetsu (Charts of Three Worlds and Diagrams of Actual Observations since Kansei Era). We analyze manuscripts of this account to show in total 15 sunspot drawings in 1749-1750. These observations were carried out by contemporary official astronomers in Japan, with telescopes covered by zongurasus (< zonglas in Dutch, corresponding to "Sunglass" in English). We count their group number of sunspots to locate them in long-term solar activity and show that their observations were situated around the solar maximum in 1749 or 1750. We also computed their locations and areas, while we have to admit the difference of variant manuscripts with one another. These observational records show the spread of sunspot observations not only in Europe but also in Japan and hence may contribute to crosscheck or possibly improve the known sunspot indices.
Deodato Radić - One of the best experts on this subject based on the ideXlab platform.
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Dynamic mechanical and dielectric absorptions in poly(2-tert-butylcyclohexyl methacrylate) and poly(4-tert-butylcyclohexyl methacrylate)
Polymer, 2000Co-Authors: R. Diaz Calleja, A.garcı́a Bernabé, Enrique Sánchez-martínez, Andrea Hormazábal, Ligia Gargallo, Deodato RadićAbstract:Abstract Dynamic mechanical and dielectric relaxations of poly(2- tert -butylcyclohexyl methacrylate) (P2tBCHM) and poly(4- tert -butylcyclohexyl methacrylate) (P4tBCHM) have been measured. The tert -butyl group inhibits the chair-to-chair motions in the cyclohexyl ring. However, small motions of the cyclohexyl group are still possible giving rise to subglass relaxations in both polymers. The dielectric response is more sensitive than the mechanical one to the corresponding applied force fields
Beredu Desta - One of the best experts on this subject based on the ideXlab platform.
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Prevalence and associated factors of pterygium among adults living in Gondar city, Northwest Ethiopia.
PloS one, 2017Co-Authors: Dereje Hayilu Anbesse, Tsehay Kassa, Biruktayit Kefyalew, Atirsaw Tasew, Abie Atnie, Beredu DestaAbstract:PURPOSE The aim of this study was to assess the prevalence and associated factors of pterygium among adults living in Gondar city, Northwest Ethiopia. METHODS A cross sectional design study was carried out in 390 participants in Gondar city from April 15 to May 7, 2016. Basic ophthalmic examination was performed using portable slit lamb, 3.5x magnifying loop with torch light and a pretested and structured questionnaire was completed. The raw data has been entered into EPI INFO 3.5.1 and analyzed by SPPSS version 20. Descriptive statistics was summarized descriptive data. Logistic regression was used to summarize the predictors of pterygium. The variables with p-value less than 0.05 were considered as significant risks of pterygium. RESULT The prevalence of pterygium among study participants was 151(38.7% (95%CI; 33.8-43.8)). Among those who have pterygium, 149(98.7%) were developed pterygium on the nasal side and 15(9.9%) on temporal side of the either eye and 13(8.6%) have both. Age between 41-60(AOR = 2.20(95%CI: 1.22, 3.39)), age between 61-86(AOR = 7.97(95%CI: 2.74, 23.17)), male sex (AOR = 2.20(95%CI: 1.28, 3.82)), outdoor working area(AOR = 3.75(95%CI: 2.18, 6.46)), the use of traditional eye medication (AOR = 2.55 (95%CI: 1.04, 5.90)) and family history of pterygium (AOR = 6.68(95% CI: 2.53, 17.60)) were positively associated with pterygium whereas use of Sunglass/hat (AOR = 0.40(95%CI:0.20, 0.78)) was negatively associated. CONCLUSION There is a high prevalence of pterygium in Gondar city northwest Ethiopia. Old age, male sex, outdoor working area, utilization of traditional eye medication and family history of pterygium were statistically significant predictors of pterygium. The use of Sunglass/hat was protective against pterygium.
Hisashi Hayakawa - One of the best experts on this subject based on the ideXlab platform.
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Sunspot Drawings by Japanese Official Astronomers in 1749-1750
Publications of the Astronomical Society of Japan, 2018Co-Authors: Hisashi Hayakawa, Kiyomi Iwahashi, Masashi Fujiyama, Toshiki Kawai, Shin Toriumi, Hideyuki Hotta, Haruhisa Iijima, Shinsuke Imada, Harufumi Tamazawa, Kazunari ShibataAbstract:Sunspot observations with telescopes in 18th century were carried out in Japan as well. One of these sunspot observations is recorded in an account called Sansaizusetsu narabini Kansei irai Jissoku Zusetsu (Charts of Three Worlds and Diagrams of Actual Observations since Kansei Era). We analyze manuscripts of this account to show in total 15 sunspot drawings in 1749-1750. These observations were carried out by contemporary official astronomers in Japan, with telescopes covered by zongurasus (< zonglas in Dutch, corresponding to "Sunglass" in English). We count their group number of sunspots to locate them in long-term solar activity and show that their observations were situated around the solar maximum in 1749 or 1750. We also computed their locations and areas, while we have to admit the difference of variant manuscripts with one another. These observational records show the spread of sunspot observations not only in Europe but also in Japan and hence may contribute to crosscheck or possibly improve the known sunspot indices.
R. Diaz Calleja - One of the best experts on this subject based on the ideXlab platform.
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Dynamic mechanical and dielectric absorptions in poly(2-tert-butylcyclohexyl methacrylate) and poly(4-tert-butylcyclohexyl methacrylate)
Polymer, 2000Co-Authors: R. Diaz Calleja, A.garcı́a Bernabé, Enrique Sánchez-martínez, Andrea Hormazábal, Ligia Gargallo, Deodato RadićAbstract:Abstract Dynamic mechanical and dielectric relaxations of poly(2- tert -butylcyclohexyl methacrylate) (P2tBCHM) and poly(4- tert -butylcyclohexyl methacrylate) (P4tBCHM) have been measured. The tert -butyl group inhibits the chair-to-chair motions in the cyclohexyl ring. However, small motions of the cyclohexyl group are still possible giving rise to subglass relaxations in both polymers. The dielectric response is more sensitive than the mechanical one to the corresponding applied force fields
