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Integration of machine learning with phase field method to model the electromigration induced Cu_(6)Sn_(5) ImC growth at anode side Cu/Sn interface

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Journal of materials Science & Technology 2020年第24期59卷 203-219页

作者： Anil Kunwar yuri Amorim Coutinho Johan Hektor Haitao ma Nele moelans Department of materials Engineering KU LeuvenKasteelpark Arenberg 44LeuvenB-3001Belgium LUNARC-Centre for Scientific and Technical Computing at Lund University Lund UniversityP.O.Box 118SE-22100LundSweden Deutsches Elektronen-Synchrotron(DESY) Notkestrasse 85Hamburg22607Germany School of materials Science and Engineering Dalian University of TechnologyDalian116024China

Currently,in the era of big data and 5G communication technology,electromigration has become a serious reliability issue for the miniaturized solder joints used in microelectronic *** the effective charge number(Z*)is considered as the driving force for electromigration,the lack of accurate experimental values for Z* poses severe challenges for the simulation-aided design of electronic *** this work,a data-driven framework is developed to predict the Z* values of Cu and Sn species at the anode based LIQUID,Cu_(6)Sn_(5) intermetallic compound(ImC)and FCC phases for the binary Cu-Sn system undergoing electromigration at 523.15 *** growth rate constants(kem)of the anode ImC at several magnitudes of applied low current density(j=1×10^6 to 10×10^6A/m^2)are extracted from simulations based on a 1D multi-phase field model.A neural network employing Z* and j as input features,whereas utilizing these computed kemdata as the expected output is *** results of the neural network analysis are optimized with experimental growth rate constants to estimate the effective charge *** a negligible increase in temperature at low j values,effective charge numbers of all phases are found to increase with current density and the increase is much more pronounced for the ImC *** predicted values of effective charge numbers Z* are then utilized in a 2D simulation to observe the anode ImC grain growth and electrical resistance changes in the multi-phase *** the work consists of the aspects of experiments,theory,computation,and machine learning,it can be called the four paradigms approach for the study of electromigration in Pb-free *** a combination of multiple paradigms of materials design can be problem-solving for any future research scenario that is marked by uncertainties regarding the determination of material properties.

关键词： Phase field method Artificial neural network Intemetallic compound Current density Synchrotron radiation

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Short-term microbial responses to soluble inorganic P input in a tropical lowland rain forest in Amazonia

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Pedosphere 2021年第6期31卷 964-972页

作者： yuri W.L.DE SOUSA Erika BUSCARDO Carlos A.N.QUESADA Henrique E.m.NASCImENTO Laszlo NAGY National Research Institute for Amazonia Manaus 69067-375(Brazil) Department of Forestry University of BrasiliaBrasilia 70910-900(Brazil) Centre for Functional Ecology University of CoimbraCoimbra 3000-456(Portugal) Department of Animal Biology University of CampinasCampinas 13083-862(Brazil)

In non-flooded lowland rain forests with low soil phosphorus(P)in parts of Amazonia,P cycling largely occurs via leaf litter recycling by arbuscular mycorrhizal(Am)fungal *** high input of P into these ecosystems occurs during drought years with increased *** the length and frequency of drought events are projected to increase in the region,a single-dose nutrient addition experiment was carried out to test how this would impact P *** application rate of 4 kg P ha^(-1) was used,which corresponds to twice the amount of litter-derived P in an average *** was hypothesized that i)the added mineral P would be immobilized by soil microorganisms,leading to measurable increase in soil microbial biomass carbon(C)and P and ii)Am colonization rate would be reduced by the pulse in mineral P available for plant *** results did not support either of our *** addition of P did not have an effect on Am root colonization,nor was P immobilized by soil microbiota during the experimental *** lack of a difference between the control and treatment at our study site could be attributed to the relatively low one-off dose of P applied that did not change either the colonization rate of roots by Am fungi or the amount of soil available labile *** obtain a mechanistic understanding of the availability,capture,and use of P by plant-symbiont associations in tropical rain forest ecosystems,further integrated studies of the soil-plant system combining long-term nutrient manipulations,modeling,and experimental approaches are required.

关键词： Amazon basin arbuscular mycorrhizal fungi nutrient addition phosphorus cycling soil microbial biomass

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Gas-phase hydrogenation influence on defect behavior in titanium-based hydrogen-storage material

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Progress in Natural Science:materials International 2017年第1期27卷 105-111页

作者： Roman S.Laptev Viktor N.Kudiiarov yuri S.Bordulev Andrey A.mikhaylov Andrey m.Lider Department of General Physics Institute of Physics and Technology National Research Tomsk Polytechnic University

Titanium and its alloys are promising materials for hydrogen storage. However, hydrogen penetration accompanies the exploitation of hydrogen storage alloys. In particular, hydrogen penetration and accumulation in titanium alloys changes their mechanical properties. Therefore, the research works of such materials are mainly focused on improving the reversibility of hydrogen absorption-liberation processes, increasing the thermodynamic characteristics of the alloys, and augmenting their hydrogen storage capacity. In the process of hydrogenation-dehydrogenation, the formed defects both significantly reduce hydrogen storage capacity and can also be used to create effective traps for hydrogen. Therefore, the investigation of hydrogen interaction with structural defects in titanium and its alloys is very important. The present work, the hydrogen-induced formation of defects in the alloys of commercially pure titanium under temperature gas-phase hydrogenation（873 K） has studied by positron lifetime spectroscopy and Doppler broadening spectroscopy. Based on the evolution of positron annihilation parameters τ_f, τd, their corresponding intensities If, Idand relative changes of parameters S/S0and W/W0, the peculiarities of hydrogen interaction with titanium lattice defects were investigated in a wide range of hydrogen concentrations from 0.8at% to 32.0at%.

关键词： Titanium Hydrogen Lattice defects Positron annihilation Positron lifetime Doppler broadening

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Population structuring of the ubiquitous stingless bee Tetragonisca angustula in southern Brazil as revealed by microsatellite and mitochondrial markers

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Insect Science 2017年第5期24卷 877-890页

作者： Flavio O. Francisco Leandro R. Santiago yuri m. mizusawa Benjamin P. Oldroyd maria C. Arias Departamento de Genetica e Biologia Evolutiva Instituto de Biociencias Universidade de Sao Paulo Rua do MatZo 277 - sala 320Sao Paulo SP Brazi Behaviour and Genetics of Social Insects Lab School of Life and Environmental Sciences A 12 University of Sydney Sydney NSW Australia

Tetragonisca angustula is one of the most widespread stingless bees in the Neotropics. This species swarms frequently and is extremely successful in urban envi- ronments. In addition, it is one of the most popular stingless bee species for beekeeping in Latin America, so nest transportation and trading is common. Nest transportation can change the genetic structure of the host population, reducing inbreeding and increasing homogenization. Here, we evaluate the genetic structure of 17 geographic populations of T. angustula in southern Brazil to quantify the level of genetic differentiation between populations. Analyses were conducted on partially sequenced mitochondrial genes and 11 microsatellite loci of 1002 workers from 457 sites distributed on the mainland and on 3 islands. Our results show that T. angustula populations are highly differentiated as demon- strated by mitochondrial DNA （mtDNA） and microsatellite markers. Of 73 haplotypes, 67 were population-specific. mtDNA diversity was low in 9 populations but microsatellite diversity was moderate to high in all populations. microsatellite data suggest 10 genetic clusters and low level of gene flow throughout the studied area. However, physical barri- ers, such as rivers and mountain ranges, or the presence or absence of forest appear to be unrelated to population clusters. Factors such as low dispersal, different ecological con- ditions, and isolation by distance are most likely shaping the population structure of this species. Thus far, nest transportation has not influenced the general population structure in the studied area. However, due to the genetic structure we found, we recommend that nest transportation should only occur within and between populations that are genetically similar.

关键词： genetic structure islands meliponini microsatellites mtDNA nest transportation

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Pharmacological pain management in chronic pancreatitis

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World Journal of Gastroenterology 2013年第42期19卷 7292-7301页

作者： Sφren S Olesen Jacob Juel Carina Graversen yuri Kolesnikov Oliver HG Wilder-Smith Asbjφrn m Drewes mechSense Department of Gastroenterology and HepatologyAalborg University Hospital9000 AalborgDenmark mech-Sense Department of RadiologyAalborg University Hospital9000 AalborgDenmark Department of Neurorehabilitation Engineering Bernstein Center for Computational NeuroscienceUniversity Medical Center G ttingenGeorg-August UniversityD-37077 GttingenGermany Pain Service Department of OncologyEast Tallinn Central Hospital19086 TallinnEstonia Pain and Nociception Neuroscience Research Group Department of AnaesthesiologyPain and Palliative CareRadboud University Nijmegen Medical Centre6525 NijmegenThe Netherlands Center for Sensory-motor Interaction Department of Health Science and TechnologyAalborg University9000 AalborgDenmark

Intense abdominal pain is a prominent feature of chronic pancreatitis and its treatment remains a major clinical *** studies of pancreatic nerves and experimental human pain research have provided evidence that pain processing is abnormal in these patients and in many cases resembles that seen in neuropathic and chronic pain *** important ultimate outcome of such aberrant pain processing is that once the disease has advanced and the pathophysiological processes are firmly established,the generation of pain can become self-perpetuating and independent of the initial peripheral nociceptive ***,the management of pain by traditional methods based on nociceptive deafferentation(e.g.,surgery and visceral nerve blockade)becomes difficult and often *** novel and improved understanding of pain aetiology requires a paradigm shift in pain management of chronic *** mechanism based pain treatments taking into account altered pain processing are likely to increasingly replace invasive therapies targeting the nociceptive source,which should be reserved for special and carefully selected *** this review,we offer an overview of the current available pharmacological options for pain management in chronic *** addition,future options for pain management are discussed with special emphasis on personalized pain medicine and multidisciplinarity.

关键词： Chronic pancreatitis Pain Treatment Pharmacology Analgesics Adjuvant analgesics

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Numerical Simulation of Blood Flow in Aorta with Dilation:A Comparison between Laminar and LES modeling methods

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Computer modeling in Engineering & Sciences 2020年第8期124卷 509-526页

作者： Lijian Xu Tianyang Yang Lekang Yin Ye Kong yuri Vassilevski Fuyou Liang School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Chest Hospital Shanghai Jiao Tong UniversityShanghai200030China Zhongshan Hospital Fudan UniversityShanghai200032China marchuk Institute of Numerical mathematics Russian Academy of SciencesMoscow119333Russia Institute for Personalized medicine Sechenov UniversityMoscow119991Russia Key Laboratory of Hydrodynamics(ministry of Education) Shanghai Jiao Tong UniversityShanghai200240China

Computational modeling methods have been increasingly employed to quantify aortic hemodynamic parameters that are challenging to in vivo measurements but important for the diagnosis/treatment of aortic *** the presence of turbulence-like behaviors of blood flow in normal or diseased aorta has long been confirmed,the majority of existing computational model studies adopted the laminar flow assumption(LFA)in the treatment of sub-grid flow *** far,it remains unclear whether LFA would significantly compromise the reliability of hemodynamic *** the present study,we addressed the issue in the context of a specific aortopathy,namely aortic dilation,which is usually accompanied by disturbed flow *** patient-specific aortas with treated/untreated dilation of the ascending segment were investigated,and their geometrical models were reconstructed from computed tomography angiographic images,with the boundary conditions being prescribed based on flow velocity information measured in vivo with the phase contrast magnetic resonance imaging *** the modeling of blood flow,apart from the traditional LFA-based method in which sub-grid flow dynamics is ignored,the large eddy simulation(LES)method capable of incorporating the dissipative energy loss induced by turbulent eddies at the sub-grid level,was adopted and taken as a reference for examining the performance of the LFA-based *** results showed that the simulated large-scale flow patterns with the two methods had high similarity,both agreeing well with in vivo measurements,although locally large between-method discrepancies in computed hemodynamic quantities existed in regions with high intensity of flow ***,a switch from the LES to the LFAbased modeling method led to mild(mputed space-averaged wall shear stress metrics(i.e.,SA-TAWSS,SA-OSI)in the ascending aortic segment where intensive vortex evolution accompanied by high stat

关键词： Blood flow aortic dilation computational modeling turbulence laminar flow assumption large eddy simulation

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mechanisms of autophagy activation in endothelial cell and their targeting during normothermic machine liver perfusion

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World Journal of Gastroenterology 2017年第48期23卷 8443-8451页

作者： yuri L Boteon Richard Laing Hynek mergental Gary m Reynolds Darius F mirza Simon C Afford Ricky H Bhogal The Liver Unit University Hospitals of BirminghamMindelsohn Way The Centre for Liver Research Institute for Biomedical ResearchUniversity of Birmingham

Ischaemia-reperfusion injury(IRI) is the leading cause of injury seen in the liver following transplantation. IRI also causes injury following liver surgery and haemodynamic shock. The first cells within the liver to be injured by IRI are the liver sinusoidal endothelial cells(LSEC). Recent evidence suggests that LSEC coordinate and regulates the livers response to a variety of injuries. It is becoming increasingly apparent that the cyto-protective cellular process of autophagy is a key regulator of IRI. In particular LSEC autophagy may be an essential gatekeeper to the development of IRI. The recent availability of liver perfusion devices has allowed for the therapeutic targeting of autophagy to reduce IRI. In particular normothermic machine liver perfusion(NmP-L) allow the delivery of pharmacological agents to donor livers whilst maintaining physiological temperature and hepatic flow rates. In this review we summarise the current understanding of endothelial autophagy and how this may be manipulated during NmP-L to reduce liver IRI.

关键词： Autophagy Liver transplant Ischaemiareperfusion injury Normothermic machine liver perfusion

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Individual stages of bacterial dichloromethane degradation mapped by carbon and chlorine stable isotope analysis

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Journal of Environmental Sciences 2019年第4期31卷 147-160页

作者： maria L.Torgonskaya Anatoly m.Zyakun yuri A.Trotsenko Kestutis S.Laurinavichius Steffen Kümmel Stéphane Vuilleumier Hans H.Richnow Laboratory of Radioactive Isotopes G.K.Skryabin Institute of Biochemistry and Physiology of MicroorganismsFRC Pushchino Center for Biological ResearchRussian Academy of Sciences Laboratory of mass Spectrometry G.K.Skryabin Institute of Biochemistry and Physiology of MicroorganismsFRC Pushchino Center for Biological ResearchRussian Academy of Sciences Department of Isotope Biogeochemistry Helmholtz Centre for Environmental Research-UFZ Université de Strasbourg CNRS

The fractionation of carbon and chlorine stable isotopes of dichloromethane(CH_2Cl_2,DCm)upon dechlorination by cells of the aerobic methylotroph methylobacterium extorquens Dm4 and by purified DCm dehalogenases of the glutathione S-transferase family was *** effects for individual steps of the multi-stage DCm degradation process,including transfer across the cell wall from the aqueous medium to the cell cytoplasm,dehalogenase binding,and catalytic reaction,were *** observed carbon and chlorine isotope fractionation accompanying DCm consumption by cell supensions and enzymes was mainly determined by the breaking of C\Cl bonds,and not by inflow of DCm into *** isotope effects of DCm dehalogenation were initially masked in high density cultures,presumably due to inverse isotope effects of non-specific DCm oxidation under conditions of oxygen *** cofactor supply remarkably affected the correlation of variations of DCm carbon and chlorine stable isotopes(Δδ^(13)C/Δδ^(37)Cl),increasing corresponding ratio from 7.2–8.6 to 9.6–10.5 under conditions of glutathione *** suggests that enzymatic reaction of DCm with glutathione thiolate may involve stepwise breaking and making of bonds with the carbon atom of DCm,unlike the uncatalyzed reaction,which is a one-stage process,as shown by quantum-chemical modeling.

关键词： Dichloromethane(DCm) microbial degradation Aerobic methylotrophic bacteria Dichloromethane dehalogenase Carbon and chlorine isotopic fractionation

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An Experimental Prototype of an Innovative Fluid-driven Electromagnetic Stirring Technique

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Journal of Iron and Steel Research International 2016年第5期23卷 422-427页

作者： Bo WANG Xiao-dong WANG yuri KOLESNIKOV San ZHANG Yan-qing TAN Xian-zhao NA College of materials Science and Opto-electronic Technology University of Chinese Academy of Sciences Institute of Thermodynamics and Fluid mechanics Ilmenau University of Technology State Key Laboratory of Advanced Steel Processing and Products Central Iron and Steel Research Institute

A new electromagnetic stirring technique that is driven by hydrodynamic forces was presented. This technique offers the following advantages. First,the stirrer can be immersed in the liquid metal,thereby significantly increasing the penetration depth of the electromagnetic forces and significantly improving the stirring efficiency; thus,this technique is particularly suitable for large-scale liquid metal. Second,under certain conditions,this technique can overcome difficulties that are encountered with traditional stirrers,such as accessing regions that are difficult to reach in working spaces with complex or narrow shapes. This stirrer also has a simpler structure than a traditional stirrer; thus,the design can be easily modified,and no external power supply is required. An experimental prototype was also presented for controlling the fluid flow rate,thereby controlling the electromagnetic force and velocity field of the driven liquid metal. The velocity distribution in a liquid Ga In Sn alloy under fluid-driven electromagnetic stirring was quantitatively measured using ultrasonic Doppler velocimetry（ UDV）. The primary results show that a remarkable velocity field has been achieved and that fluid-driven electromagnetic stirring is an effective means of stirring liquid metal. Finally,the potential applications of this technique in industry,along with key challenges,were discussed.

关键词： fluid electromagnetic stirring liquid metal skin effect Lorentz force

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Twenty-three new spider species(Arachnida:Araneae)from Asia

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Zoological Systematics 2021年第2期46卷 91-152页

作者： Yejie Lin yuri m.marusik Caixia Gao Hao Xu Xiaoqing Zhang Ziyi Wang Wenhui Zhu Shuqiang Li Institute of Zoology Chinese Academy of SciencesBeijing 100101China Institute for Biological Problems of the North RAS Portovaya Str.18Magadan 685000Russia Department of Zoology&Entomology University of the Free StateBloemfontein 9300South Africa

A new genus,Sinophaena Lin&Li,***.,of the spider family Anyphaenidae Bertkau,1878 is reported,with *** Lin&Li,***.(♀)from Sichuan,China as the type *** bivalva(Zhang&Song,2004)*** transferred from Anyphaena Sundevall,*** new species reported in the current paper include:Anyphaena grovyle Lin&Li,***.(♂♀,Hainan),*** Lin&Li,***.(♂♀,Hainan),*** Lin&Li,***.(♂♀,Guangdong),*** Lin&Li,***.(♂♀,Tibet),*** Lin&Li,***.(♂♀,Hainan),Cybaeus fushun Lin&Li,***.(♀,Liaoning),*** Lin&Li,***.(♀,Jilin),Eresus lishizheni Lin,marusik&Li,***.(♂,Xinjiang),Alistra pikachu Lin&Li,***.(♂♀,Guangdong),Sinopesa gollum Lin&Li,***.(♂,Guangdong),Pimoa gagna Zhang&Li,***.(♀,India),*** Zhang&Li,***.(♂♀,India),*** Zhang&Li,***.(♂♀,India),Selenops crewsae Lin&Li,***.(♀,Sichuan),Sinopoda helii Wang&Li,***.(♂♀,Sichuan),Phlogiellus jiaxiangi Lin&Li,***.(♂♀,Guangxi),Episinus bonjovi Lin&Li,***.(♂♀,Yunnan),*** Lin&Li,***.(♂♀,Yunnan),*** Lin&Li,***.(♂♀,Yunnan),meotipa luoqiae Lin&Li,***.(♂,Yunnan),*** Lin&Li,***.(♂,Yunnan),and *** Lin&Li,***.(♂,Yunnan).The female of Belisana yuexiu Yao&Li,2020 is reported for the first *** types are deposited in the Institute of Zoology,Chinese Academy of Sciences(IZCAS)in Beijing,China.

关键词： Diagnosis distribution epigyne taxonomy type species

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