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Gold nanoparticles supported on mesoporous iron oxide for enhanced CO oxidation reaction
Tanaka, Shunsuke,Lin, Jianjian,Kaneti, Yusuf Valentino,Yusa, Shin-ichi,Jikihara, Yohei,Nakayama, Tsuruo,Zakaria, Mohamed Barakat,Alshehri, Abdulmohsen Ali,You, Jungmok,Hossain, Md. Shahriar A.,Yamauch The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.10
<P>Herein, we report the synthesis of gold (Au)-loaded mesoporous iron oxide (Fe2O3) as a catalyst for both CO and NH3 oxidation. The mesoporous Fe2O3 is firstly prepared using polymeric micelles made of an asymmetric triblock copolymer poly(styrene-<I>b</I>-acrylic acid-<I>b</I>-ethylene glycol) (PS-<I>b</I>-PAA-<I>b</I>-PEG). Owing to its unique porous structure and large surface area (87.0 m<SUP>2</SUP> g<SUP>−1</SUP>), the as-prepared mesoporous Fe2O3 can be loaded with a considerably higher amount of Au nanoparticles (Au NPs) (7.9 wt%) compared to the commercial Fe2O3 powder (0.8 wt%). Following the Au loading, the mesoporous Fe2O3 structure is still well-retained and Au NPs with varying sizes of 3-10 nm are dispersed throughout the mesoporous support. When evaluated for CO oxidation, the Au-loaded mesoporous Fe2O3 catalyst shows up to 20% higher CO conversion efficiency compared to the commercial Au/Fe2O3 catalyst, especially at lower temperatures (25-150 °C), suggesting the promising potential of this catalyst for low-temperature CO oxidation. Furthermore, the Au-loaded mesoporous Fe2O3 catalyst also displays a higher catalytic activity for NH3 oxidation with a respectable conversion efficiency of 37.4% compared to the commercial Au/Fe2O3 catalyst (15.6%) at 200 °C. The significant enhancement in the catalytic performance of the Au-loaded mesoporous Fe2O3 catalyst for both CO and NH3 oxidation may be attributed to the improved dispersion of the Au NPs and enhanced diffusivity of the reactant molecules due to the presence of mesopores and a higher oxygen activation rate contributed by the increased number of active sites, respectively.</P>
New Collision Force Suppression Mechanism and Base Control of Human-Friendly Robot
Naoto Tanaka,Takayuki Iwama,Shunsuke Kumagai,Atsuo Takanishi,Hun-ok Lim 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
This paper describes a human-friendly robot capable of securing human safety in human-robot collisions. The upper body of the robot has 11 DOFs, including 3 DOFs in the waist, 2 DOFs in each shoulder, 1 DOF in each elbow and 1 DOF in each hand. The upper body is mounted on the base with four omnidirectional wheels. A new light-weight collision force suppression mechanism that is able to operate with very little backlash was developed and was installed at the elbow of the human-friendly robot. The suppression mechanism consists a drum, a clutch gear, two release air bag, two stopper linings, and four compression springs. Also, a base control method to secure human safety is discussed. Through collision experiments, the effectiveness of the collision force suppression mechanism and control method is verified.
Trial to Evaluate Wettability of Liquid Zn with Steel Sheets Containing Si and Mn
Shimada, Shunsuke,Takada, Yoshihisa,Lee, Joonho,Tanaka, Toshihiro The Iron and Steel Institute of Japan 2008 ISIJ international Vol.48 No.9
<P>Since it has been pointed out that liquid Zn alloy sometimes exhibits non-wetting behavior on high-tensile strength steels usually containing Si and Mn, there have been several studies to improve the wettability of liquid Zn. Although those studies evaluated the wettability qualitatively by observation of the surface of galvanized steels or exfoliation testing of Zn on steel substrates, it is further required to evaluate the wettability of liquid Zn on steels by measuring the contact angle, work of adhesion, spreading velocity <I>etc.</I> which are usually used to assess the general wetting behavior. In the present work, we applied a sessile drop method to measure the change in contact angle and diameter of liquid Zn droplets wetted on steels containing Si and Mn with time to evaluate quantitatively the dynamic wetting behavior of liquid Zn on steel substrates.</P>
( Shogo Tanaka ),( Shunsuke Kitano ),( Hidakazu Itai ),( Satoru Shibuya ),( Jin-suk Hur ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
OSYNOPSIS 하수도 서비스의 보급과 더불어 하수관로나 처리장 등의 스톡도 확대되고,이와 함께 시설의 노화도 진행되고 있다. 이에 따라 유지관리에 필요한 비용도 매년 증가하고 관로의 노후화에 따른 도로함몰 등의 위험도 높아지고 있는 실정이다. 이러한 배경을 바탕으로 일본은 2008 년도에 하수도 장수명화 지원제도가 창설되어 2013 년도 이후는 공적자금 교부대상 사업으로 개축(갱신,장수명화 대책)을 실시하는 경우에는,장수명화 계획을 따르도록 제한하고 있다. 따라서 향후 노후화한 시설을 개축하여 건전한 상태로 지속적으로 사용하기 위해서는 장수명화 계획 수립이 필수적이다. 이러한 장수명화 계획에서는 손상 열화가 확인된 관로에 대한 대책(개축, 수선)과 계획기간내의 년도별 사업량을 명시하도록 하고 있다. 한편,각 지방자치단체의 재정상황은 앞으로 더욱 어려워질 것으로 예상되어 한정된 자원으로 효과적인 유지관리 사업을 실시하기 위해서는 시설의 노화도,중요도 및 투자의 평준화 등을 고려한 개축갱신의 우선순위 결정이나 사업계획 스케쥴 수립이 무엇보다 중요하다. 본 논문에서는 하수도 관로를 대상으로 한 장수명화 계획에 따른 우선순위 검토 사례를 소개하고자 한다.
The Effect of Si and Mn Content on Dynamic Wetting of Steel with Liquid Zn
Takada, Yoshihisa,Shimada, Shunsuke,Lee, Joonho,Kurosaki, Masao,Tanaka, Toshihiro The Iron and Steel Institute of Japan 2009 ISIJ international Vol.49 No.1
<P>Non-wetting behavior of liquid Zn alloy sometimes occurs on high-tensile strength steels that usually contain Si and Mn. Many studies have been undertaken to improve the wettability of liquid Zn. In this work, we applied the sessile drop method to measure the change in contact angle and diameter of liquid Zn droplets wetted on steels containing Si and Mn with time. We could then quantitatively evaluate the wettability of those steels using liquid Zn. Si weakens the work of adhesion and spreading velocity of liquid Zn on steels. Mn, however, has a small effect on the contact angle and the work of adhesion but occasionally increases the spreading velocity even when Si content is high in steels.</P>
Misaki Hanaoka,HIDEHIRO KANEDA,SHINKI OYABU,Yasuki Hattori,Kotomi Tanaka,Sota Ukai,Kazuyuki Shichi,Takehiko Wada,Toyoaki Suzuki,Kentaroh Watanabe,Koichi Nagase,Shunsuke Baba,Chihiro Kochi 한국천문학회 2017 天文學論叢 Vol.32 No.1
To realize large-format compact array detectors covering a wide far-infrared wavelength range up to 200 $\mu$m, we have been developing Blocked-Impurity-Band (BIB) type Ge detectors with the room-temperature surface-activated wafer bonding technology provided by Mitsubishi Heavy Industries. We fabricated various types of $p^+$-$i$ junction devices which possessed a BIB-type structure, and evaluated their spectral response curves using a Fourier transform spectrometer. From the Hall effect measurement, we also obtained the physical characteristics of the $p^+$ layers which constituted the $p^+$-$i$ junction devices. The overall result of our measurement shows that the $p^+$-$i$ junction devices have a promising applicability as a new far-infrared detector to cover a wavelength range of 100--200 μm.
Tsumugi Jono,Yuki Kasai,Takaomi Kessoku,Tomoki Ogata,Kosuke Tanaka,Takayuki Kato,Eiji Sakai,Takeo Kurihashi,Machiko Nakatogawa,Shunsuke Oyamada,Seiji Futagami,Kok-Ann Gwee,Atsushi Nakajima 대한소화기 기능성질환∙운동학회 2024 Journal of Neurogastroenterology and Motility (JNM Vol.30 No.1
Background/AimsThe precise incidence of symptomatic uncomplicated diverticular disease (SUDD) and its effects on the quality of life (QOL) remain unclear, particularly in Asian patients with right-sided SUDD. We assess the prevalence of SUDD and its impact on QOL in a real-world population. MethodsFive institutional cohorts of patients who received outpatient treatment for unexplained abdominal symptoms from January 15, 2020 to March 31, 2022, were included. All patients underwent colonoscopy. SUDD was defined as the presence of recurrent abdominal symptoms, particularly pain in the lower right or left quadrant lasting > 24 hours in patients with diverticulosis at the site of pain. The 36-item short-form health survey was used to assess QOL. ResultsDiverticula were identified in 108 of 361 patients. Among these 108 patients, 31% had SUDD, which was right-sided in 39% of cases. Of the 50 patients with right-sided diverticula, 36% had SUDD, as did 15 of 35 patients with left-sided diverticula (43%). Among the 33 patients with SUDD, diverticula were right-sided, left-sided, and bilateral in 39%, 45%, and 15% of patients, respectively. Diarrhea was more frequent in the SUDD group than in the non-SUDD group. Patients with SUDD had significantly lower physical, mental, and role/social component scores than those without SUDD. ConclusionsIt is important to recognize that patients with SUDD account for as high as 31% of outpatients with unexplained abdominal symptoms; these patients have diarrhea and a low QOL. The presence of right-sided SUDD was characteristic of Asian patients.
Katsuki Yaguchi,Reiko Kunisaki,Sho Sato,Kaori Hirai,Misato Izumi,Yoshimi Fukuno,Mami Tanaka,Mai Okazaki,Rongrong Wu,Yurika Nishikawa,Yusuke Matsune,Shunsuke Shibui,Yoshinori Nakamori,Masafumi Nishio,M 대한장연구학회 2024 Intestinal Research Vol.22 No.3
Background/Aims: Intestinal Behçet disease is typically associated with ileocecal punched-out ulcers and significant morbidity and mortality. Intestinal ultrasound is a noninvasive imaging technique for disease monitoring. However, no previous reports have compared intestinal ultrasound with endoscopic ulcer activity or histopathological findings for intestinal Behçet disease. We evaluated the usefulness of intestinal ultrasound for assessing the activity of ileocecal ulcers in intestinal Behçet disease.Methods: We retrospectively compared intestinal ultrasound findings with 73 corresponding endoscopic images and 6 resected specimens. The intestinal ultrasound findings were assessed for 7 parameters (bowel wall thickness, vascularity [evaluated using the modified Limberg score with color Doppler], bowel wall stratification, white-plaque sign [strong hyperechogenic lines or spots], mesenteric lymphadenopathy, extramural phlegmons, and fistulas), and endoscopic ulcer activity was classified into active, healing, and scar stages. Histopathological findings were evaluated by consensus among experienced pathologists. Results: Bowel wall thickness (P< 0.001), vascularity (P< 0.001), loss of bowel wall stratification (P= 0.015), and white-plague sign (P= 0.013) were significantly exacerbated in the endoscopic active ulcer stage. Receiver operating characteristic curve analysis revealed that a bowel wall thickness of > 5.5 mm (sensitivity 89.7%, specificity 85.3%) was potentially useful for detecting active lesions. When compared with histopathological findings, an increase in bowel wall thickness reflected the ulcer marginal ridge, and the white-plaque sign reflected the ulcer bottom. Conclusions: Intestinal ultrasound is useful for monitoring intestinal ulcer activity in intestinal Behçet disease.