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Investigation of the factors affecting the limit of detection of laser-induced breakdown spectroscopy for surface inspection

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Plasma Science and Technology 2019年第3期21卷 174-181页

作者： Tadatake sato Kenichi TASHIRO Yoshizo KAWAGUCHI Hideki OHMURA Haruhisa AKIYAMA Electronics and Photonics Research Institute National Institute of Advanced Science and Technology (AIST) Research Institute for Sustainable Chemistry National Institute of Advanced Science and Technology (AIST)

Laser-induced breakdown spectroscopy(LIBS) was examined to detect a trace substance adhered onto Al alloys for the surface inspection of materials to be adhesively bonded. As an example of Si contamination, silicone oil was employed and sprayed onto substrates with a controlled surface concentration. LIBS measurements employing nanosecond UV pulses(λ?=?266 nm) and an off-axis emission collection system with different detecting heights were performed. Because surface contaminants are involved in the plasma formed by laser ablation of the substrates, the relative contribution of the surface contaminants and the substrates to the plasma emission could be changed depending on the conditions for plasma formation. The limit of detection(LOD) was evaluated under several detecting conditions for investigating the factors that affected the LOD. A significant factor was the standard deviation values of signal intensities obtained for the clean substrates. This value varied depending on the measurement *** the Al alloy(A6061), the smallest LOD obtained was 0.529 μg?·?cm^(-2). Furthermore, an improved LOD(0.299 μg?·?cm^(-2)) was obtained for the Al alloy with a lower Si content.

关键词： laser-induced breakdown spectroscopy adhesive bonding surface contamination detection pre-bond surface inspection

Friction-stir welding and processing of Ti-6Al-4V titanium alloy:A review

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Journal of Materials Science & Technology 2018年第1期34卷 58-72页

作者： S.Mironov Y.S.sato H.Kokawa Department of Materials Processing Graduate School of Engineering Tohoku University

In this work, the current understanding and development of fliction-stir welding and processing of Ti- 6Al-4V alloy are briefly reviewed. The critical issues of these processes are addressed, including welding tool materials and design, tool wea,, processing temperature, material flow, processing window and residual stresses. A particular emphasis is given to microstructural aspects and microstructure-properties relationship. Potential engineering applications are highlighted.

关键词： Ti-6Al-4V titanium alloy Friction-stir welding Friction-stir processing Microstructure Properties

Effects of Solid Solution Treating on the Microstructureand Damping Behaviour of MnCuNiFe Alloys

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Journal of Materials Science & Technology 1998年第4期14卷 299-307页

作者： Yin, Fuxing Ohsawa, Y. sato, A. Kawahara, K. National Research Institute for Metals Tsukuba Ibaraki 305-0047 Japan B.B.Materia Co. Ltd. Chiba-Shi Chiba 267-0066 Japan

A high damping condition is easily obtained in Mn-(16-24) Cu-(4-6) Ni-2Fe (at. pct) alloys, when cooling rate is controlled after the solid solution treatment at 1173 K. It was observed that the temperature dependent changes of logarithmic decrement in 10 h cooled samples are sensitive to the alloy composition. As compared with water quenching treatment, controlled 10 h cooling improves T//N temperature of the alloys extensively by producing a Mn-enriched matrix portion in the alloys. Calculations suggest that the relative decreases of Cu and Ni content in the matrix portion be dominated by the Ni content in the original alloys, and therefore, the volume fraction of the Cu, Ni-enriched precipitates is estimated to be about 20% and 10% in the 4Ni and 6Ni alloys, respectively. As a result, the T//N temperature for each alloy, corresponding to the rising temperature of logarithmic decrement, has been related to the Cu, and Ni in the Mn-enriched matrix. The existence of left brace 110 right brace twinning boundaries is confirmed in the microstructure of both 4Ni and 6Ni alloys. However, the relative lattice strains, which the twinning boundaries act to accommodate, were found largely different in the two alloys. It is considered that boundaries with smaller orientation deviation can coordinate the external stresses easily by cyclic moving, and therefore, the broader damping peak which occurs in the 10 h cooled 6Ni alloy becomes feasible. Electron diffraction results also indicate possible formation of many sub-crystals in the matrix phase, which are relatively rotated on some invariant planes. Those sub-crystal boundaries might play some attenuation roles in the temperature range between T//N and room temperature. (Edited author abstract) 9 Refs.

关键词： Manganese alloys

Effects of Public Transfers on Income Inequality and Poverty in Rural China

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China & World Economy 2022年第5期30卷 29-48页

作者： Hisatoshi Hoken Hiroshi sato School of International Studies Kwansei Gakuin UniversityJapan Graduate School of Economics Hitotsubashi UniversityJapan

This study examines the impacts of public transfers on income inequality and poverty reduction in rural *** uses nationally representative rural household surveys from the China Household Income Project and classifies public transfers into threetypesuniversal,pro-poor,and reimbursable transfers-to compare the impacts of eachtype of public transfer in 2013and *** results show that the contributions of eachtypeof publictransfertoreducing incomeinequalityweregenerally small in both 2013 and ***,the effects of reimbursable transfers were the largest of the three *** also found that the poverty-reducing effects were the largest for reimbursabletransfers,and their impactshaveconsiderably improved inthewestern *** impacts of pro-poor transfers were intermediate but have developed notably in the central *** findings suggest that reimbursableand pro-poortransfers contributed mainly to reducing rural poverty but the impacts were heterogeneous among regions.

关键词： income inequality poverty public transfer rural policy social insurance

The Most Complete Pistosauroid Skeleton from the Triassic of Yunnan,China

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Acta Geologica Sinica(English Edition) 2008年第2期82卷 283-286页

作者： ZHAO Lijun Tamaki sato LI Chun Department of Earth Sciences Zhejiang University Hangzhou Zhejiang 310027 China Zhejing Museum of Natural History Hangzhou Zhejiang 310012 China Department of Natural Science Tokyo Gakugei University Nukui Kita-Machi 4-1-1 Koganei City Tokyo 184-8501 Japan Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

A new specimen discovered from the Falang Formation in northeastern Yunnan represents the most complete skeleton of Triassic pistosauroids. The new specimen is referred to Yunguisaurus Cheng et al., 2006 on the basis of the skull features, such as the presence of a separated nasal entering the external naris, a large pineal foramen located at the frontal/parietal suture and an interpterygoid vacuity with a narrow anterior extension. The new specimen differs from the type species of Yunguisaurus liae Cheng et al., 2006 in some aspects. Most of these differences can be attributed to ontogenetic variations. The new specimen is provisionally considered as Yunguisaurus cf. liae although its relatively short snout of the skull and slenderer hyoid may not be explained ontogenetically. Whether or not the new specimen represents a different taxon has to wait for a detailed study of the whole skeleton.

关键词： Pistosauroid Yunguisaurus complete skeleton Falang Formation late Middle Triassic,Yunnan

Intensity correction in all-sky auroral image projection transform

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Chinese Science Bulletin 1997年第8期42卷 700-703页

作者： Yang, YG Liu, RY sato, NS Polar Research Institute of China Shanghai 200129 China

BY using all-sky(fish-eye)lens and highly sensitive TV camera,the effective monitoring ra-dius and time resolution of ground aurora observation have now been raised to 600 km and1/30 s(for instance,SIT-TV camera recording in NTSC format).By incorporating high-sen-sitivity imaging device(integrated from image intensifier and CCD(charge coupled device)

关键词： All-sky auroral image projection transtorm intensity correction.

Absorption events associated with solar flares

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Chinese Science Bulletin 2001年第5期46卷 369-372页

作者： N.sato H.Yamagishi Polar Research Institute of China Shanghai China Department of Physics La Trobe University Bundoora Australia STE Laboratory Nagoya University Toyokawa Japan National Institute of Polar Research Tokyo Japan

During the upward period of solar cycle 23, the imaging riometer at Zhongshan, Antarctica (geomag. lat. 74.5°S) was used to study the solar proton events and the X-ray solar flares which are associated with the absorption events. In our study, the relationship between the absorption intensity and X-ray flux is found in a power form which is consistent with the theoretical result. The imaging riometer absorption data at Ny-Alesund, Svalbard reconfirm the above relationship. We also argue that only M-class flares can generate a significant daytime absorption.

关键词： imaging riometer X-ray flare solar proton event ionospheric absorption.

Strategy for the control of drug-induced liver injury due to investigational treatments/drugs for COVID-19

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World Journal of Gastroenterology 2021年第48期27卷 8370-8373页

作者： Ken sato Yuichi Yamazaki Toshio Uraoka Department of Gastroenterology and Hepatology Gunma University Graduate School of MedicineMaebashi 371-8511GunmaJapan

Investigational treatments/drugs for coronavirus disease 2019(COVID-19)have been applied,with repurposed or newly developed drugs,and their effectiveness has been *** of these drugs may be hepatotoxic,and each monotherapy or combination therapy may increase the risk of drug-induced liver injury(DILI).We should aim to control dysregulation of liver function,as well as the progression of COVID-19,as much as *** discussed the potential risks of investigational treatments/drugs and promising drugs for both COVID-19 and DILI due to investigational treatments/drugs.

关键词： Coronavirus disease 2019 Drug-induced liver injury Cytochrome P450 Drug-drug interaction Drug-disease interaction Cytokine

Large-duct pattern invasive adenocarcinoma of the pancreas–a variant mimicking pancreatic cystic neoplasms: A minireview

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World Journal of Gastroenterology 2021年第23期27卷 3262-3278页

作者： Hiroki sato Andrew Scott Liss Yusuke Mizukami Division of Gastroenterology and Hematology/Oncology Department of MedicineAsahikawa Medical UniversityAsahikawa 0788510HokkaidoJapan Department of Surgery Massachusetts General Hospital and Harvard Medical SchoolMassachusetts General HospitalBostonMA 02114United States Institute of Biomedical Research Sapporo Higashi Tokushukai HospitalSapporo 0650033HokkaidoJapan

Pancreatic cancer currently has no subtypes that inform clinical decisions;hence,there exists an opportunity to rearrange the morphological and molecular taxonomy that guides a better understanding of tumor ***,accumulating studies to date have revealed the large-duct type variant,a unique subtype of pancreatic ductal adenocarcinoma(PDA)with cystic *** subtype often radiographically mimics intraductal papillary mucinous neoplasms(IPMNs)and involves multiple small cysts occasionally associated with solid ***“bunch-of-grapes”sign,an imaging characteristic of IPMNs,is absent in large-duct ***-duct PDA defines the mucin profile,and genetic alterations are useful in distinguishing large-duct PDA from ***,neoplastic ducts measure over 0.5 mm,forming large ductal *** to classic PDAs,this subtype is frequently accompanied by perineural invasion and abundant desmoplastic reactions,and KRAS mutations in codon 12 are nearly *** such morphological similarities with IPMNs,the prognosis of large-duct PDA is equivalent to that of classic *** diagnosis is therefore essential.

关键词： Large-duct pattern invasive carcinoma of the pancreas Pancreatic ductal adenocarcinoma Pancreatic cystic disease Clinicopathological features of pancreatic cancer Pancreatic cancer subtype