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Artificial-intelligence-assisted mass fabrication of nanocantilevers from randomly positioned single carbon nanotubes

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Microsystems & Nanoengineering 2023年第2期9卷 333-343页

作者： Yukihiro Tadokoro Keita Funayama Keisuke Kawano Atsushi mura Jun Hrotani Yutaka Ohno Hiroya Tanaka Toyota Central R&D Labs. Inc.NagakuteAichiJapan Toyota Research Institute of North America Ann ArborMIUSA Nagoya University NagoyaAichiJapan

Nanoscale cantilevers(nanocantilevers)made from carbon nanotubes(CNTs)provide tremendous benefits in sensing and electromagnetic *** nanoscale structure is generally fabricated using chemical vapor deposition and/or dielectrophoresis,which contain manual,time-consuming processes such as the placing of additional electrodes and careful observation of single-grown ***,we demonstrate a simple and Artificial Intelligence(Al)-assisted method for the effcient fabrication of a massive CNT-based *** used randomly positioned single CNTs on the *** trained deep neural network recognizes the CNTs,measures their positions,and determines the edge of the CNT on which an electrode should be clamped to form a *** experiments demonstrate that the recognition and measurement processes are automatically completed in 2 s,whereas comparable manual processing requires 12 *** the small measurement error by the trained network(within 200 nm for 90%of the recognized CNTs),more than 34 nanocantilevers were successfully fabricated in one *** high accuracy contributes to the development of a massive field emitter using the CNT-based nanocantilever,in which the output current is obtained with a low applied *** further showed the benefit of fabricating massive CNT-nanocantilever-based field emitters for neuromorphic *** activation function,which is a key function in a neural network,was physically realized using an individual CNT-based field *** introduced neural network with the CNT-based field emitters recognized handwritten images *** believe that our method can accelerate the research and development of CNT-based nanocantilevers for realizing promising future applications.

关键词： cantilever carbon network

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Therapeutic and clinical aspects of portal vein thrombosis in patients with cirrhosis

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World Journal of Hepatology 2015年第29期7卷 2906-2912页

作者： Massimo Primignani Giulia Tosetti Vincenzo La mura U.O. gastroenterologia ed Epatologia IRCCS-Ca’ GrandaOspedale Maggiore Policlinico U.O. Medicina Interna IRCCS-San DonatoDipartimento di Scienze Biomediche per la SaluteUniversità degli studi di Milano

Portal vein thrombosis(PVT) is a frequent complication in cirrhosis, particularly in advanced stages of the disease. As for general venous thromboembolism, risk factors for PVT are slow blood flow, vessel wall damage and hypercoagulability, all features of advanced cirrhosis. Actually, the old dogma of a hemorrhagic tendency in cirrhosis has been challenged by new laboratory tools and the clinical evidence that venous thrombosis also occurs in cirrhosis. The impaired hepatic synthesis of both pro- and anticoagulants leads to a rebalanced hemostasis, more liable to be tipped towards thrombosis or even bleeding. Conventional anticoagulant drugs(low molecular weight heparin or vitamin K antagonists) may be used in cirrhosis patients with PVT, particularly in those eligible for liver transplantation, to prevent thrombosis progression thus permitting/facilitating liver transplant. However, several doubts exist on the level of anticoagulation achieved as estimated by coagulation tests, on the efficacy of treatment monitoring and on the correct timing for discontinuation in non-transplant candidates, while in transplant candidates there is expert consensus on continuing anticoagulation until transplantation. The recent introduction of direct acting oral anticoagulant drugs(DOACs) in other clinical settings generates much interest on their possible application in patients with cirrhosis and PVT. However, DOACs were not evaluated yet in patients with liver disease and cannot be recommended for the present time.

关键词： Portal vein thrombosis Coagulopathy Hypercoagulopathy Direct acting oral anticoagulantdrugs Cirrhosis

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Halogen-specific total organic halogen analysis： Assessment by recovery of total bromine

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Journal of Environmental Sciences 2017年第8期29卷 340-348页

作者： Markus Langsa Sebastien Allard ina Kristiana Anna Heitz Cynthia A.Joll Curtin Water Quality Research Centre Department of Chemistry Curtin University Perth Western Australia 6102 Australia Department of Civil Engineering Curtin University Perth Western Australia 6102 Australia Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan AlamUniversitas PapuaManokwaripapua Barat 98314Indonesia

Determination of halogen-specific total organic halogen（TOX） is vital for studies of disinfection of waters containing bromide, since total organic bromine（TOBr） is likely to be more problematic than total organic chlorine. Here, we present further halogen-specific TOX method optimisation and validation, focusing on measurement of TOBr. The optimised halogen-specific TOX method was validated based on the recovery of model compounds covering different classes of disinfection by-products（haloacetic acids, haloacetonitriles,halophenols and halogenated benzenes） and the recovery of total bromine（mass balance of TOBr and bromide concentrations） during disinfection of waters containing dissolved organic matter and bromide. The validation of a halogen-specific TOX method based on the mass balance of total bromine has not previously been reported. Very good recoveries of organic halogen from all model compounds were obtained, indicating high or complete conversion of all organic halogen in the model compound solution through to halide in the absorber solution for ion chromatography analysis. The method was also successfully applied to monitor conversion of bromide to TOBr in a groundwater treatment plant. An excellent recovery（101%）of total bromine was observed from the raw water to the post-chlorination stage. Excellent recoveries of total bromine（92%–95%） were also obtained from chlorination of a synthetic water containing dissolved organic matter and bromide, demonstrating the validity of the halogen-specific TOX method for TOBr measurement. The halogen-specific TOX method is an important tool to monitor and better understand the formation of halogenated organic compounds, in particular brominated organic compounds, in drinking water systems.

关键词： Total organic bromine Dissolved organic matter Bromide Chlorination Drinking water Health effects

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Failure behavior of soil-rock mixture slopes based on centrifuge model test

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Journal of Mountain Science 2019年第8期16卷 1928-1942页

作者： WANG Teng ZHANG ga State Key Laboratory of Hydroscience and Engineering Tsinghua University

The stability of soil-rock mixtures(SRMs) that widely distributed in slopes is of significant concern for slope safety evaluation and disaster prevention. The failure behavior of SRM slopes under surface loading conditions was investigated through a series of centrifuge model tests considering various volumetric gravel contents. The displacement field of the slope was determined with image-based displacement system to observe the deformation of the soil and the movement of the block during loading in the tests. The test results showed that the ultimate bearing capacity and the stiffness of SRM slopes increased evidently when the volumetric block content exceeded a threshold value. Moreover, there were more evident slips around the blocks in the SRM slope. The microscopic analysis of the block motion showed that the rotation of the blocks could aggravate the deformation localization to facilitate the development of the slip surface. The high correlation between the rotation of the key blocks and the slope failure indicated that the blocks became the dominant load-bearing medium that influenced the slope failure. The blocks in the sliding body formed a chain to bear the load and change the displacement distribution of the adjacent matrix sand through the block rotation.

关键词： Soil rock mixture Slope stability Slope failure Centrifuge model test

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A Novel Full-Euler Low Mach Number IMEX Splitting

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Communications in Computational Physics 2020年第1期27卷 292-320页

作者： Jonas Zeifang Jochen Schutz Klaus Kaiser Andrea Beck Maria Lukacova-Medvid’ova Sebastian Noelle IAG Universiẗat StuttgartPfaffenwaldring 21DE-70569 StuttgartGermany Faculty of Sciences Hasselt UniversityAgoralaan Gebouw DBE-3590 DiepenbeekBelgium IGPM RWTH Aachen UniversityTemplergraben 55DE-52062 AachenGermany Institut f̈ur Mathematik Johannes Gutenberg-Universiẗat MainzStaudingerweg 9DE-55128 MainzGermany

In this paper,we introduce an extension of a splitting method for singularly perturbed equations,the socalled RS-IMEX splitting[Kaiser et al.,Journal of Scientific Computing,70(3),1390–1407],to deal with the fully compressible Euler *** straightforward application of the splitting yields sub-equations that are,due to the occurrence of complex eigenvalues,not hyperbolic.A modification,slightly changing the convective flux,is introduced that overcomes this *** is shown that the splitting gives rise to a discretization that respects the low-Mach number limit of the Euler equations;numerical results using finite volume and discontinuous galerkin schemes show the potential of the discretization.

关键词： Euler equations low-Mach IMEX Runge-Kutta RS-IMEX

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Graphene and other two-dimensional materials

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Frontiers of physics 2019年第1期14卷 1-4页

作者： Kostya S. Novoselov Daria V. andreeva Wencai Ren Guangcun Shan School of Physics and Astronomy University of Manchester Manchester M13 9PL United Kingdom National Graphene Institute University of Manchester Manchester M13 9PL United Kingdom Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore 6 Science Drive 2 117546 Singapore Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Instrumentation Science and Opto-electronics Engineering Beihang University Beijing 100191 China

Over the last few years,research on graphene [1-3]has progressed significantly,and as a result,a number of reallife applications of graphene have been realized [4,5].This carbon allotrope (for a review on other forms of carbon, see [6])resulted in a number of novel physical phenomena already discovered (ranging from new types of quantum Hall effect to universal optical conductivity)and dramatically expanded the range of possible applications for such materials (from transparent conductive coating to ultrafast photodetectors).

关键词： Graphene two-dimensional materials universal optical conductivity

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Effect of 0.3% Sc on microstructure, phase composition and hardening of Al-Ca-Si eutectic alloys

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Transactions of Nonferrous Metals Society of China 2017年第4期27卷 741-746页

作者： Nikolay BELOV evgenia NAUMova Torgom AKOPYAN National University of Science and Technology MISIS 4 Leninskiy pr. 4 Moscow 119049 Russia Institute of Russian Academy of Sciences A. A. Baikov Institute of Metallurgy and Material Science RASLeninskiy pr. 49 Moscow 119991 Russia

The phase composition,microstructure and hardening of aluminum-based experimental alloys containing0.3%Sc,0?14%Si and0?10%Ca(mass fraction)were *** experimental study(electron microscopy,thermal analysis and hardnessmeasurements)was combined with Thermo-Calc software simulation for the optimization of the alloy *** wasdetermined that the maximum hardening corresponded to the annealing at300?350°С,which was due to the precipitation of Al3Scnanoparticles with their further *** alloys falling into the phase region(Al)+Al4Ca+Al2Si2Ca have demonstrated asignificant hardening *** ternary eutectic(Al)+Al4Ca+Al2Si2Ca had a much finer microstructure as compared to the Al?Sieutectic,which suggests a possibility of reaching higher mechanical properties as compared to commercial alloys of the *** commercial alloys of the A356type,the model alloy does not require quenching,as hardening particles are formed in thecourse of annealing of castings.

关键词： Al-Ca-Si-Sc system alloy eutectic Al3Sc nanoparticles phase composition microstructure heat treatment hardening

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Flow and heat transfer behaviour of nanofluids in microchannels

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Progress in Natural Science:Materials International 2018年第2期28卷 225-234页

作者： James Bowers Hui Cao Geng Qiao Qi Li gan Zhang Ernesto mura Yulong Ding SSE Engineering Centre Birmingham Centre for Energy Storage & School of Chemical Engineering University of Birmingham Global Energy Interconnection Research Institute Europe GmbH

Flow and heat transfer of aqueous based silica and alumina nanofluids in microchannels were experimentally investigated. The measured friction factors were higher than conventional model predictions at low Reynolds numbers particularly with high nanoparticle concentrations. A decrease in the friction factor was observed with increasing Reynolds number, possibly due to the augmentation of nanoparticle aggregate shape arising from fluid shear and alteration of local nanoparticle concentration and nanofluid viscosity. Augmentation of the silica nanoparticle morphology by fluid shear may also have affected the friction factor due to possible formation of a core/shell structure of the particles. Measured thermal conductivities of the silica nanofluids were in approximate agreement with the Maxwell-Crosser model, whereas the alumina nanofluids only showed slight enhancements. Enhanced convective heat transfer was observed for both nanofluids, relative to their base fluids(water), at low particle concentrations. Heat transfer enhancement increased with increasing Reynolds number and microchannel hydraulic diameter. However, the majority of experiments showed a larger increase in pumping power requirements relative to heat transfer enhancements, which may hinder the industrial uptake of the nanofluids, particularly in confined environments, such as Micro Electro-Mechanical Systems(MEMS).

关键词： Nanofluid Microchannel Heat transfer Pressure drop Friction factor Thermal conductivity Viscosity

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西藏猪HEV流行病学调查和组织病理学观察

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中国兽医杂志 2025年第1期61卷 94-99页

作者：娄永志辛娇娇索朗斯珠贡嘎西藏农牧学院动物科学学院西藏林芝860000

为掌握西藏猪戊型肝炎病毒(HEV)流行情况,本试验采集西藏藏猪血清样本313份,西藏林芝约克猪肝脏样本53份;对藏猪血清进行HEV-IgG抗体检测,并进行t检验分析;对约克猪肝脏样本进行反转录聚合酶链式反应(RT-PCR),检测HEV开放阅读框2(ORF2)... 详细信息

为掌握西藏猪戊型肝炎病毒(HEV)流行情况,本试验采集西藏藏猪血清样本313份,西藏林芝约克猪肝脏样本53份;对藏猪血清进行HEV-IgG抗体检测,并进行t检验分析;对约克猪肝脏样本进行反转录聚合酶链式反应(RT-PCR),检测HEV开放阅读框2(ORF2)基因保守区域,对RT-PCR阳性产物测序后进行系统发育进化和同源性分析,确定西藏猪HEV基因型;通过实时荧光定量PCR(qPCR)和苏木精-伊红(H.E.)染色对阳性肝脏组织进行病原定量和病理分析。结果显示,313份西藏藏猪血清样本中HEV-IgG抗体总阳性率为35.46%(111/313),其中,公藏猪和母藏猪抗体阳性率分别为39.31%(68/173)和30.71%(43/140);1~2月龄仔猪、2~4月龄保育猪、4~6月龄育肥猪和8月龄以上猪抗体阳性率分别为27.87%(17/61)、32.93%(27/82)、43.00%(43/100)和34.29%(24/70)。西藏约克猪肝脏样本中检测到2份HEV RNA阳性样本,分别命名为TLZyork1和TLZyork2,GenBank登录号为PP464289和PP464290,拷贝数为3.15×10^(3)和2.81×10^(4)copies/mL,与HEV 4a、4b、4c、4d基因型同源性为73.9%~97.4%;系统发育进化树分析显示,约克猪TLZyork1和TLZyork2均属于HEV 4d基因型。约克猪HEV RNA阳性肝脏样本H.E.染色结果显示,肝脏组织中大量肝细胞水肿,中央静脉周围肝细胞呈气球样变性,少量淋巴细胞浸润等。综上,西藏藏猪和约克猪中存在HEV流行,提示相关部门应进一步重视对西藏猪HEV的防控。

关键词：藏猪约克猪戊型肝炎病毒(HEV) 流行病学调查组织病理学染色

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Centrifuge model tests on pile-reinforced slopes subjected to drawdown

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第6期12卷 1290-1300页

作者： Sujia Liu Fangyue Luo ga Zhang State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing100084China

Piles are generally an effective way to reduce the risk of slope ***,previous approaches for slope stability analysis did not consider the effect of the piles coupled with the decrease of the water level(drawdown).In this study,a series of centrifuge model tests was performed to understand the deformation and failure characteristics of slopes reinforced with various pile *** the centrifuge model tests,the pile-reinforced slopes exhibited two typical failure modes under drawdown conditions:across-pile failure and through-pile *** the through-pile slope failure,a discontinuous slip surface was observed,implying that the assumption of the slip surface in previous stability analysis methods was *** test results showed that drawdown led to instability of the piles in cohesive soil,as the saturated cohesive soil failed to provide sufficient constraint for *** slope exhibited progressive failure,from top to bottom,during *** deformation of the piles was reduced by increasing the embedment depth and row number of *** addition,the deformation of soils outside the piles was influenced by the piles and showed a similar distribution shape as the piles,and the similarity degree weakened as the distance from the piles *** study also found that the failure mechanism of unreinforced and pile-reinforced slopes induced by drawdown could be described by coupling between the deformation localization and local failure,and it revealed that pile-reinforced slopes could reduce slope deformation localization during drawdown.

关键词： Slope Pile Drawdown Failure Reinforcement Centrifuge model test

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