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Effect of Load and Sliding Speed on Corrosive Wear of Metals in Seawater
T. KAWAZOE,A. URA,A. NAKASHIMA,H. Moritaka 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
The objective of this study is to evaluate corrosive wear resistance of metals used for bearings and gears in seawater. Sliding wear test of ferrous and copper materials against Al₂O₃ were carried out in artificial seawater using an electrochemical potentiostat. As the results, the wear rate and the coefficient of friction of the copper materials are lower than those of the ferrous materials. The corrosive wear of stainless steel is remarkably affected by normal load and sliding speed in view of tribological characteristics including adhesion and corrosion products.
중년여성의 주관적인 건강상태, 갱년기 증상, 스트레스 대처행위가 중년 위기감에 미치는 영향
구다슬,김기현,소정은,이애현,이유정,이윤서,이희진,정서윤,Kawazoe Serina,강숙정,김윤정 이화여자대학교 간호학회 2018 이화간호학회지 Vol.- No.52
Purpose: This study aims to identify the effects of subjective health status, climacteric symptoms and coping behaviors of middle-aged women on mid-life crisis, and to provide basic data for developing nursing intervention to reduce mid-life crisis of the middle-aged women. Method: Surveys were distributed to middle-aged women between age of 40 to 65. 261 surveys were collected and analyzed using descriptive stastics, t-test, one-way ANOVA and Pearsson's correlation using the SPSS 20.0 program. Result: The mid-life crisis is affected by subject health status(β = -0.22, p < 0.001) and climacteric symptoms(β = 0.22, p < 0.001). It implies that in order for middle-aged women to have less mid life crisis, good subjective health status with less climacteric symptoms is required. Conclusion: The result of the study suggests that mid-life crisis of middle-aged women is related to subjective health status and climacteric symptoms. Therefore, in order to reduce mid-life crisis of middle-aged women, they should be provided climacteric education program to alleviate the severity of climacteric symptoms and nursing intervention to improve subjective health status.
Enhanced wound healing by an epigallocatechin gallate‐incorporated collagen sponge in diabetic mice
Kim, HakHee,Kawazoe, Takeshi,Han, Dong‐,Wook,Matsumara, Kazuaki,Suzuki, Shigehiko,Tsutsumi, Sadami,Hyon, Suong‐,Hyu Blackwell Publishing Inc 2008 Wound repair and regeneration Vol.16 No.5
<P><B>ABSTRACT</B></P><P>Epigallocatechin‐3‐<I>O</I>‐gallate (EGCG), the major polyphenolic compound present in green tea, has potent anti‐oxidant and free radical‐scavenging activities. In this study, various concentrations (10, 100, and 1,000 ppm) of EGCG were incorporated into a collagen sponge (CS) in order to investigate its healing effects on full‐thickness wounds created in type 2 diabetic mice. After 14 days, the residual wound size of the mice treated with 10 ppm EGCG‐incorporated collagen sponge (E‐CS) decreased significantly faster than that of the other mice. Moreover, significant increases in the degree of reepithelialization, the thickness of the granulation tissue, and the density of the capillaries were also histologically observed in the wound sites exposed to 10 ppm E‐CS in comparison with the others. Furthermore, 10 ppm E‐CS resulted in significant increases in the immunoreactivity of Ki‐67 (reepithelialization at the wound site), CD31 (formation of blood vessels), and α‐smooth muscle actin (the induction of myofibroblasts across the dermis). These results suggest that a CS incorporated with EGCG at low concentrations can enhance wound healing in diabetic mice by accelerating reepithelialization and angiogenesis as well as improving the cellular reorganization of granulation tissue by triggering the activity of myofibroblasts.</P>