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An upgrade recycling from Mg alloy chips toward superconducting MgB2 via powder processing
Makoto Nanko,Daisuke Maruoka,Hitoshi Ozawa,Shigeharu Kamado,Hiroya Abe,Akira Kondo,Makio Naito 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
A recycling process of Mg alloy chips to obtain superconducting MgB2 is proposed. In the present process, mechanical milling was used to mix and grind AZ31 chips and boron powder. Fine AZ31/boron powder mixture can be fabricated via a mechanical milling process. Mechanical milling can reduce the process time to synthesize MgB2 powder. An AZ31/boron mixture via mechanical milling can be reacted completely to MgB2 by heating at 700℃ for 3 h. Sintered MgB2 bodies produced by a pulsed electric current sintering technique showed approximately 30 K as the superconducting critical temperature. A recycling process of Mg alloy chips to obtain superconducting MgB2 is proposed. In the present process, mechanical milling was used to mix and grind AZ31 chips and boron powder. Fine AZ31/boron powder mixture can be fabricated via a mechanical milling process. Mechanical milling can reduce the process time to synthesize MgB2 powder. An AZ31/boron mixture via mechanical milling can be reacted completely to MgB2 by heating at 700℃ for 3 h. Sintered MgB2 bodies produced by a pulsed electric current sintering technique showed approximately 30 K as the superconducting critical temperature.
Nobuaki Ikezawa,Takashi Toyonaga,Shinwa Tanaka,Tetsuya Yoshizaki,Toshitatsu Takao,Hirofumi Abe,Hiroya Sakaguchi,Kazunori Tsuda,Satoshi Urakami,Tatsuya Nakai,Taku Harada,Kou Miura,Takahisa Yamasaki,Stu 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.3
Background/Aims: Endoscopic submucosal dissection (ESD) for diverticulum-associated colorectal lesions is generally contraindicatedbecause of the high risk of perforation. Several studies on patients with such lesions treated with ESD have been reported recently. However, the feasibility and safety of ESD for lesions in proximity to a colonic diverticulum (D-ESD) have not been fully clarified. Theaim of this study was to evaluate the feasibility and safety of D-ESD. Methods: D-ESD was defined as ESD for lesions within approximately 3 mm of a diverticulum. Twenty-six consecutive patients whounderwent D-ESD were included. Two strategic approaches were used depending on whether submucosal dissection of the diverticulum-related part was required (strategy B) or not (strategy A). Treatment outcomes and adverse events associated with each strategywere analyzed. Results: The en bloc resection rate was 96.2%. The R0 and curative resection rates were 76.4% and 70.6% in strategy A and 88.9% and77.8% in strategy B, respectively. Two cases of intraoperative perforation and one case of delayed perforation occurred. The delayed perforationcase required emergency surgery, but the other cases were managed conservatively. Conclusions: D-ESD may be a feasible treatment option. However, it should be performed in a high-volume center by expert handsbecause it requires highly skilled endoscopic techniques.
Kaneko, Kenji,Moon, Won-Jin,Inoke, Koji,Horita, Zenji,Ohara, Satoshi,Adschiri, Tadafumi,Abe, Hiroya,Naito, Makio Elsevier 2005 Materials science & engineering. properties, micro Vol.403 No.1
<P><B>Abstract</B></P><P>TiO<SUB>2</SUB>–Ag nanocomposite particles were prepared by spray pyrolysis of TiO<SUB>2</SUB> (7nm) dispersed AgNO<SUB>3</SUB> solution. The structures and morphologies of powders were carefully characterized by combination of transmission electron microscopy (TEM) and three-dimensional electron tomography (3D-ET). It was clearly demonstrated by 3D-ET that the TiO<SUB>2</SUB>–Ag nanocomposite particle was consisted of well-dispersed Ag nanoparticles within TiO<SUB>2</SUB> matrix. Furthermore, it was shown by high-resolution TEM that the spray pyrolysis was capable of fabricating Ag particles with a few nm in size.</P>
Kei Matsumoto,Shinwa Tanaka,Takashi Toyonaga,Nobuaki Ikezawa,Mari Nishio,Masanao Uraoka,Tomoatsu Yoshihara,Hiroya Sakaguchi,Hirofumi Abe,Tetsuya Yoshizaki,Madoka Takao,Toshitatsu Takao,Yoshinori Morit 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.1
Background/Aims: The anastomotic site after distal gastrectomy is the area most affected by duodenogastric reflux. Differentreconstruction methods may affect the lesion characteristics and treatment outcomes of remnant gastric cancers at the anastomoticsite. We retrospectively investigated the clinicopathologic and endoscopic submucosal dissection outcomes of remnant gastriccancers at the anastomotic site. Methods: We recruited 34 consecutive patients who underwent endoscopic submucosal dissection for remnant gastric cancer at theanastomotic site after distal gastrectomy. Clinicopathology and treatment outcomes were compared between the Billroth II and non-Billroth II groups. Results: The tumor size in the Billroth II group was significantly larger than that in the non-Billroth II group (22 vs. 19 mm;p=0.048). More severe gastritis was detected endoscopically in the Billroth II group (2 vs. 1.33; p=0.0075). Moreover, operation timewas longer (238 vs. 121 min; p=0.004) and the frequency of bleeding episodes was higher (7.5 vs. 3.1; p=0.014) in the Billroth IIgroup. Conclusions: Compared to remnant gastric cancers in non-Billroth II patients, those in the Billroth II group had larger lesions with abackground of severe remnant gastritis. Endoscopic submucosal dissection for remnant gastric cancers in Billroth II patients involvedlonger operative times and more frequent bleeding episodes than that in patients without Billroth II.