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High thermal stable blue-emitting alkali silicate phosphor, Eu2+-activated Na2Mg2Si6O15
Masato Iwaki,Kazuma Sugimoto,Masaru Watanabe,Kazuyoshi Uematsu,Kenji Toda,Mineo Sato 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
White LEDs based on near ultraviolet LED and red/green/blue phosphors have been attracted in terms of outstanding colorrendering index. In particular, we focus on the blue emitting phosphors because the commercial BaMgAl10O17:Eu2+ needs hightemperature in order to be obtained. In this study, we succeeded in synthesizing Eu2+-activated Na2Mg2Si6O15 phosphors asa single phase by the conventional solid state reaction. Eu2+-doped Na2Mg2Si6O15 phosphors showed the broad blue emissionfrom 400-550 nm due to the 4f-5d allowed transition of Eu2+ under the ultraviolet light excitation. Moreover, the emissionintensity of Eu2+-activated Na2Mg2Si6O15 phosphor at high temperature kept about 85% at 423 K, which indicated the thermalstability of Na2Mg2Si6O15:Eu2+ was extremely higher than that of other Eu2+-activated silicate phosphors. Thus, Eu2+-activatedNa2Mg2Si6O15 phosphor is able to become the novel luminescent material for White LED based on the near-ultraviolet LED.
Nonalcoholic Fatty Liver Disease as a Systemic Disease and the Need for Multidisciplinary Care
Yoneda Masato,Kobayashi Takashi,Iwaki Michihiro,Nogami Asako,Saito Satoru,Nakajima Atsushi 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.6
Nonalcoholic fatty liver disease (NAFLD) is currently the most common chronic liver disease, and there has been a rapid increase in cases worldwide. NAFLD is rapidly becoming the leading cause of hepatocellular carcinoma and is also associated with an increased risk of cardiovascular disease or exacerbation of other organ diseases, thus posing a significant health problem from both a medical and a socioeconomic perspective. NAFLD is a systemic disease and requires the involvement of numerous medical professionals. Multidisciplinary collaboration, in which different professionals within different specialties come together and work together toward a common goal, supports better patient care by integrating perspectives of multiple experts and facilitating the exchange of opinions. Due to the large number of potential patients, gastroenterologists and hepatologists cannot manage the patients alone, and collaboration between specialists in various fields, including family doctors, dentists, nutritionists, and pharmacists is required for treatment of NAFLD. This review will discuss NAFLD from the perspective of various specialties and introduce multidisciplinary collaboration.
Asako Nogami,Masato Yoneda,Michihiro Iwaki,Takashi Kobayashi,Yasushi Honda,Yuji Ogawa,Kento Imajo,Satoru Saito,Atsushi Nakajima 대한간학회 2023 Clinical and Molecular Hepatology(대한간학회지) Vol.29 No.-
Non-alcoholic fatty liver disease is currently the most common chronic liver disease, affecting up to 25% of the global population. Simple fatty liver, in which fat is deposited in the liver without fibrosis, has been regarded as a benign disease in the past, but it is now known to be prognostic. In the future, more emphasis should be placed on the quantification of liver fat. Traditionally, fatty liver has been assessed by histological evaluation, which requires an invasive examination; however, technological innovations have made it possible to evaluate fatty liver by non-invasive imaging methods, such as ultrasonography, computed tomography, and magnetic resonance imaging. In addition, quantitative as well as qualitative measurements for the detection of fatty liver have become available. In this review, we summarize the currently used qualitative evaluations of fatty liver and discuss quantitative evaluations that are expected to further develop in the future.
Novel green Sr4ScAl3O10:Eu2+ phosphor prepared by the Melt Quenching Technique
Kenji Toda,Masato Iwaki,Minenori Katsu,Shin-nosuke Kamei,Sun Woog Kim,Takuya Hasegawa,Masaru Muto,Ryota Yamanashi,Tatsuya Sakamoto,Tadashi Ishigaki,Kazuyoshi Uematsu,Mineo Sato,Dae Ho Yoon 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
New green-emitting Sr4ScAl3O10:Eu2+ phosphor was prepared using a novel melt quenching synthesis method. The temperatureof raw materials irradiated with the strong light of the Xe arc-lamp was rose up to about 2273 K, followed by a sharp dropin the temperature after turn off the lamp. This method is a useful tool for rapid screening of novel phosphor materials.