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Friction and Wear Behaviors of WC-Co/WC-Co Pairs in Air
Hosokawa H.,Nakajima T.,Shimojima K. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
To investigate sliding friction and wear behaviors of WC-Co/WC-Co pairs containing different WC grain sizes, the ball-on-disc test in air were carried out, where WC grain sizes a (F.G.) and (C.G.). The wear volume of F.G. pin for F.G. pin/C.G. disc is larger than that of F.G. pin for F.G. pin/F.G. disc due to higher friction coefficient, and the surfaces after wear test are richer in oxygen compared to those before test. Furthermore, the wear debris, which is composed of nona-scale grain, after the wear test are remarkably richer in oxygen than to those before test.
Bio-functions of Marine Carotenoids
Masashi Hosokawa,Tomoko Okada,Nana Mikami,Izumi Konishi,Kazuo Miyashita 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.1
Carotenoids being most important pigments among those occurring in nature, have received increased interest owing to their beneficial effects on human health. An effort is made to review marine carotenoids as important bioactive compounds with reference to their presence, chemical, and biofunctional benefits they afford. The potential beneficial effects of marine carotenoids were particularly focused on astaxanthin and fucoxanthin, major marine carotenoids found in marine animals and aquatic plants, respectively. Both carotenoids show strong antioxidant activity which is attributed to quenching singlet oxygen and scavenging free radicals. The potential role of the carotenoids as dietary antioxidants has been suggested as being one of the main mechanism by which they afford their beneficial health effects such as anticancer activity and antiinflammatory effect. Only recently, antiobesity effect and antidiabetic effect have been noted as specific and novel biofunctions of fucoxanthin. Nutrigenomic study reveals that fucoxanthin induces uncoupling protein 1 (UCP1) expression in white adipose tissue (WAT) mitochondria to lead to oxidation of fatty acids and heat production in WAT. Fucoxanthin improves insulin resistance and decreases blood glucose level, at least in part, through the down-regulation of tumor necrosis factor α (TNFα) in WAT of animals.
Little Leaguer’s Shoulder Can Cause Severe Three-Dimensional Humeral Deformity
Yuji Hosokawa,Teruhisa Mihata,Yasuo Itami,Masashi Neo,Munekazu Doi 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.4
We analyzed three-dimensional (3D) humeral deformity (valgus–varus, flexion–extension, and rotational deformation) after little leaguer’s shoulder using 3D computed tomography in a 15-year-old male baseball player. Humeral retroversion was increased by 27.1° on the dominant side compared with the nondominant side. Compared with the nondominant shaft, the dominant humeral shaft was deformed in the varus direction (9.4°), resulting in a decreased neck–shaft angle (dominant side, 127.5°; nondominant side, 135.1°), and it was also deformed in the extension direction (21.0°). This case demonstrates that little leaguer’s shoulder can cause markedly greater humeral retroversion than has been reported previously and can result in varus and extension deformation of the humerus. These findings suggest that humeral deformity in overhead throwing athletes may not always solely reflect adaptation to throwing.
( Takuya Hosokawa ),( In-hee Hwang ),( Shigetoshi Takahashi ),( Takayuki Matsuo ),( Toshihiko Matsuto ),( Masaaki Kurata ),( Norio Maeda ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-
Fabric filter is a representative dust collection device for flue gas treatment in solid waste incinerator. Particulate matter in flue gas is collected on the outside of fabric bags and is periodically dislodged by a pulse of compressed air. Built-up dust layer on the fabric can be a medium to remove smaller size particle but it brings about an increase of pressure loss in fabric filter. In general, the pressure loss caused by dust layer on fabric filter is known to occupy more than half of total pressure loss for the operation of incineration system. The increase of pressure loss leads to the increase of electric consumption of induced draft fan (IDF) to keep a negative pressure in the incinerator. Thus, the control of pressure loss of fabric filter is important to operate incinerate on system. Under this circumstance, one incineration facility reported that pressure loss of fabric filter became lower when wastewater including phosphoric acid was sprayed to furnace for incineration. Phosphoric acid in wastewater was considered to influence the decrease of pressure drop in bag house. In this work, a laboratory scale of experimental apparatus simulating a fabric filter was prepared to reveal the effect of phosphoric acid spray on pressure drop of fabric filter and physico-chemical property of fly ash as well. 7.5 g of fly ash was supplied to the filter by a micro-feeder. Phosphoric acid solution was sprayed by adjusting that the weight ratio of phosphorus became 0~10wt% of fly ash. Variation of pressure drop at the filter, arithmetic average roughness of ash layer on the filter cloth, and particle size distribution and circularity of fly ash were measured under the experiments of spraying different concentration of phosphoric acid solution to the filter cloth. In addition, the form of phosphorus compound in fly ash was analyzed using X-ray diffractometer (XRD, Rigaku Co., Ltd). XRD peaks were identified by Match!2 of software for diffraction peak analysis. As the results, it was found that the increase of pressure drop per unit weight of ash was suppressed when phosphoric acid was sprayed by 2~3wt% as the weight ratio of phosphorus to fly ash. Particle size of fly ash was increased by spraying phosphoric acid. On the other hand, there were no significant changes on arithmetic average roughness at the surface of ash layer and circularity of fly ash with or without spraying phosphoric acid. Calcium hydroxide and calcium hydroxide chloride decreased in fly ash whereas dibasic calcium phosphate was produced in fly ash by spraying phosphoric acid. It indicates that phosphoric acid might consume calcium hydroxide as well as reaction products of calcium hydroxide and hydrogen chloride in fly ash. Thus, the excessive amount of phosphoric acid spray will have a bed influence on flue gas treatment. Considering the effect of pressure loss decrease in fabric filter, the influence on flue gas treatment, and operating cost, phosphoric acid should be sprayed by 2~3wt% as the weight ratio of phosphorus to fly ash.