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Advanced operation of heated fluidic resonators via mechanical and thermal loss reduction in vacuum

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Microsystems & Nanoengineering 2023年第5期9卷 255-262页

作者： Juhee Ko Bong Jae Lee Jungchul Lee Department of Mechanical engineering Center for Extreme Thermal Physics and ManufacturingKorea Advanced Institute of Science and Technology(KAIST)34141 DaejeonKorea

For simultaneous and quantitative thermophysical measurements of ultrasmall liquid volumes,we have recently developed and reported heated fluidic resonators(HFRs).In this paper,we improve the precision of HFRs in a vacuum by significantly reducing the thermal loss around the sensing element.A vacuum chamber with optical,electrical,and microfluidic access is custom-built to decrease the convection loss by two orders of magnitude under 10-4 mbar *** a result,the measurement sensitivities for thermal conductivity and specific heat capacity are increased by 4.1 and 1.6 times,*** differentiating between deionized water(H2O)and heavy water(D2O)with similar thermophysical properties and~10%different mass densities,the signal-to-noise ratio(property differences over standard error)for H2O and D2O is increased by 9 and 5 times for thermal conductivity and specific heat capacity,respectively.

关键词： fluid operation vacuum

Behavior Characteristics of Asphalt Components during the Process of Nano-cracks Temperature Self-healing

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 149-155页

作者：张海涛 ZHANG Qianhui LI Ming 于腾江 College of Civil engineering Northeast Forestry UniversityHarbin 150040China Safety Production Technology center of Heilongjiang Province Harbin 150040China School of Architecture engineering Weifang UniversityWeifang 261061China

In order to investigate the behavior characteristics of asphalt components during the process of nano-cracks temperature self-healing(NTS),molecular simulation technology was used to simulate the temperature self-healing of *** on the determination of asphalts(virgin asphalt and aged asphalt),the proportional changes of asphalt components were *** distribution characteristics of asphalt components were obtained by marking different components in the process of *** the same time,the rationality of the micro simulation findings was confirmed by asphalt performance tests and infrared spectroscopy *** results show that different asphalt components have different behavior characteristics in the process of *** content of asphaltene and resin plays a key role in the process of NTS,while saturation and aromatics play an active role in the temperature self-healing before and after *** NTS is the result of the comprehensive action of different components,and the self-healing efficiency is proportional to the relative molecular *** effect of aging on the NTS is also realized by changing the proportion of asphalt components.

关键词： asphalt components behavior characteristics nano-cracks temperature self-healing molecular simulation

Twin evolution in cast Mg-Gd-Y alloys and its dependence on aging heat treatment

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Journal of Magnesium and Alloys 2023年第7期11卷 2285-2298页

作者： Jingli Li Zhaohui Dong Xin Yi Di Wu Rongshi Chen Department of Mechanics and engineering Science College of EngineeringPeking UniversityBeijing 100871China Shi-Changxu Innovation center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Effects of rare-earth(RE)and precipitates on twin evolution in cast Mg-10Gd-3Y-0.5Zr(wt.%)(GW103)alloys of solid solution(T4)and aged(T6)states are investigated performing quasi-static room temperature compression tests and microstructural *** is found that both{10–12}and{11–21}extension twins(ET1 and ET2)can appear in the T4 and T6 states but with different emergence *** the aging heat treatment leads to consumption of RE solutes which could inhibit atomic shuffling required for nucleation of ET1 but not ET2,ET2 occurs prior to ET1 in the T4 state,and ET1 emerges before ET2 in the T6 *** extension twins here mainly coordinate the plastic deformation through the non-Schmid *** results shed light on the influence of RE elements on twin evolution in magnesium alloys and have implications in developing high-performance Mg-RE alloys.

关键词： Mg-Gd-Y-Zr alloys Rare-earth Precipitates Twinning Compression

Microscopic cracking behaviors of rocks under uniaxial compression with microscopic multiphase heterogeneity by deep learning

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International Journal of Mining Science and Technology 2023年第4期33卷 411-422页

作者： Zhi Zhao Yundong Shou Xiaoping Zhou School of Civil engineering Wuhan UniversityWuhan 430072China National center for International Research on Deep Earth Drilling and Resource Development Faculty of EngineeringChina University of Geosciences(Wuhan)Wuhan 430074China

Cracking behaviors of rocks significantly affect the safety and stability of the explorations of underground space and deep *** understand deeply the microscopic cracking process and mechanical property of rocks,X-ray micro-computed tomography(X-μCT)is applied to capture the rock *** digital color difference UNet(DCD-UNet)-based deep learning algorithm with 3D reconstruction is proposed to reconstruct the multiphase heterogeneity microstructure models of *** microscopic cracking and mechanical properties are studied based on the proposed microstructure-based peridynamic *** show that the DCD-UNet algorithm is more effective to recognize and to represent the microscopic multiphase heterogeneity of *** damage characteristic index of multiphase rocks increases,transgranular cracks in the same grain phase,transgranular and intergranular cracks of pore-grain phase,intergranular and secondary transgranular cracks and transgranular crack between different grains *** ultimate microscopic failure modes of rocks are mainly controlled by the transgranular cracks-based T1-shear,T3-shear,T1-tension,T2-tension and T3-tension failures,and the intergranular cracks-based T1-tension,T1-shear and T3-shear failures under uniaxial compression.

关键词： X-μCT imaging Deep learning Microscopic multiphase heterogeneity Uniaxial compression Transgranular-intergranular cracks

Stereoblock Polypropylenes Prepared by Efficient Chain Shuttling Polymerization of Propylene with Binary Zirconium Catalysts and iBu3Al

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Chinese Journal of Polymer Science 2020年第11期38卷 1192-1201,I0006页

作者： Xiao Yin Huan Gao Fei Yang Li Pan Bin Wang Zhe Ma Yue-Sheng Li Tianjin Key Lab of Composite&Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Collaborative Innovation center of Chemical Science and engineering(Tianjin) Tianjin 300072China

Stereoblock polypropyienes bearing isotactic,atactic,and syndictactic polypropylene segments were successfully prepared by dry methylaluminoxane activated binary catalysts system,Ph2CFluCpZrCl2 and {Me2Si(2,5-Me2-3-(2-MePh)-cyclopento[2,3-b]thiophen-6-yl)2}ZCl2,in the presence of iBu3Al as a chain shutting *** studying the catalyst activity,chain transfer efficiency,and reversility of chain transfer reaction of each catalyst system,as well as the molecular weight and polydispersity of the resulting polymers,the allyl exchange reactions between the zirconium catalyst and different main-group metal alky were estimated,*** on the optimized react condition,the chain shuttling polymerization was conducted by binary catalyst system in the presence of iBu3Al under both atmospheric and high *** polymers were identified as stereoblock polypropylenes according to microstructure and physical properties analyses by 13C{1H}-NMR,DsC,and GPC.

关键词： Stereoblock polypropylenes Chain shuttling polymerization Zirconium catalyst Chain transfer reaction

Precise regulation of the phase transformation for pyrolusite during the reduction roasting process

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 81-90页

作者： Ruofeng Wang Peng Gao Shuai Yuan Yanjun Li Yingzhi Liu Cheng Huang School of Resources and Civil engineering Northeastern UniversityShenyang 110819China National-Local Joint engineering Research center of High-efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

The mechanism involved in the phase transformation process of pyrolusite (MnO_(2)) during roasting in a reducing atmosphere was systematically elucidated in this study,with the aim of effectively using low-grade complex manganese ore *** to single-factor experiment results,the roasted product with a divalent manganese (Mn^(2+)) distribution rate of 95.30% was obtained at a roasting time of 25 min,a roasting temperature of 700℃,a CO concentration of 20at%,and a total gas volume of 500 mL·min^(-1),in which the manganese was mainly in the form of manganosite (MnO).Scanning electron microscopy and Brunauer–Emmett–Teller theory demonstrated the microstructural evolution of the roasted product and the gradual reduction in the pyrolusite ore from the surface to the core Thermodynamic calculations,X-ray photoelectron spectroscopy,and X-ray diffractometry analyses determined that the phase transformation of pyrolusite followed the order of MnO_(2)→Mn_(2)O_(3)→Mn_(3)O_(4)→MnO phase by phase,and the reduction of manganese oxides in each valence state proceeded simultaneously.

关键词： pyrolusite phase transformation reduction roasting microstructural evolution reaction mechanism

Analysis of overload-based cascading failure in multilayer spatial networks

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Chinese Physics B 2020年第9期29卷 404-414页

作者： Min Zhang Xiao-Juan Wang Lei Ji Mei Song Zhong-Hua Liao School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Beijing Complex Product Advanced Manufacturing engineering Research center Beijing Simulation CenterBeijing 100854China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System EngineeringBeijing 100854China

Many complex networks in real life are embedded in space and most infrastructure networks are interdependent,such as the power system and the transport *** this paper,we construct two cascading failure models on the multilayer spatial *** our research,the distance l between nodes within the layer obeys the exponential distribution P(l)~exp(-l/ζ),and the length r of dependency link between layers is defined according to node *** entropy approach is applied to analyze the spatial network structure and reflect the difference degree between *** metrics,namely dynamic network size and dynamic network entropy,are proposed to evaluate the spatial network robustness and *** the cascading failure process,the spatial network evolution is analyzed,and the numbers of failure nodes caused by different reasons are also counted,***,we discuss the factors affecting network *** demonstrate that the larger the values of average degree,the stronger the network *** the length r decreases,the network performs *** the probability p is small,asζdecreases,the network robustness becomes more *** p is large,the network robustness manifests better performance asζ*** results provide insight into enhancing the robustness,maintaining the stability,and adjusting the difference degree between nodes of the embedded spatiality systems.

关键词： cascading failure multilayer network load distribution spatial network entropy

Layered Ag-graphene films synthesized by Gamma ray irradiation for stable lithium metal ano des in carb on ate-based electrolytes

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Journal of Energy Chemistry 2022年第1期31卷 354-363,I0010页

作者： Jiaxiang Liu Haoshen Ma Zhipeng Wen Huiyang Li Jin Yang Nanbiao Pei Peng Zhang Jinbao Zhao College of Energy Xiamen UniversityXiamen 361102FujianChina State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsEngineering Research Center of Electrochemical TechnologyMinistry of EducationState-Province Joint Engineering Laboratory of Power SourceTechnology for New Energy VehicleCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

Lithium metal batteries are considered as high energy density battery systems with very promising prospects and have bee n widely ***,The uncon trollable plating/strippi ng behavior,infinite volume change and den drites formation of lithium metal anode restrict the applicati *** unc on trolled n ucleati on of lithium caused by the non uniform multi-physical field distributions,can lead to the undesirable lithium ***,a graphene composite uniformly loaded with Ag nano-particles(Ag NPs)is prepared through a facile Gamma ray irradiation method and assembled into self-supported film with layered structure(Ag-rGO film).Whe n such film is used as a lithium metal an ode host,the uncontrolled deposition is converted into a highly nucleation-induced *** one hand,the Ag NPs distributed between the in terlayers of graphe ne can preferentially induce lithium nu cleati on and en able uniform deposition morphology of lithium between *** the other hand,the stable layered graphene structure can accommodate volume change,stabilize the interface between anode and electrolyte and inhibit dendrites ***,the layered Ag-rGO film as anode host can reach a high Coulombic efficiency over 93.3% for 200 cycle(786 h)at a current density of 1 mA cm^(-2) for 2 mAh cm^(-2) in carbonate-based *** work proposes a facile Gamma ray irradiation method to prepare metal/3D-skeleton structure as lithium anode host and demonstrates the potential to regulate the lithium metal deposition behaviors via manipulating the distribution of lithiophilic metal(***)in 3D *** may offer a practicable thinking for the subsequent design of the lithium metal anode.

关键词： Lithium metal anode Gamma Ray irradiation Ag nano-particles Inductive effect Layered structure Uniform lithium deposition

Molecular Markers and Candidate Genes for Thermo-Sensitive Genic Male Sterile in Rice

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Rice science 2019年第3期26卷 147-156,I0008-I0012页

作者： Sudthana KHLAIMONGKHON Sriprapai CHAKHONKAEN Keasinee PITNGAM Khanittha DITTHAB Numphet SANGARWUT Natjaree PANYAWUT Thiwawan WASINANON Chareerat MONGKOLSIRIWATANA Julapark CHUNWONGSE Amorntip MUANGPROM center for Agricultural Biotechnology Kasetsart University National center for Genetic engineering and Biotechnology National Science and Technology Development Agency Division of Genetics Faculty of Liberal Arts and Science Kasetsart University

The discovery of thermo-sensitive genic male sterility(TGMS) has led to development of a simple and highly efficient two-line breeding system. In this study, genetic analysis was conducted using three F_2 populations derived from crosses between IR68301 S, an indica TGMS rice line, and IR14632(tropical japonica), Supanburi 91062(indica) and IR67966-188-2-2-1(tropical japonica), *** 1:3 ratio between sterile and normal pollen of F_2 plants from the three populations revealed that TGMS is controlled by a single recessive gene. Bulked segregant analysis using simple sequence repeat(SSR) and insertion-deletion(InDel) markers were used to identify markers linked to the tms gene. The linkage analysis based on the three populations indicated that the tms locus was located on chromosome 2 covering the same area. Using IR68301S × IR14632 F_2 population, the results showed that the tms locus was located between SSR marker RM12676 and InDel marker 2gAP0050058. The genetic distance from the tms gene to these two flanking markers were 1.10 and 0.82 cM, *** marker 2gAP004045 located between these two markers showed complete co-segregation with the TGMS phenotype. In addition, InDel marker vf0206114052 showed 2.94 cM linked to the tms gene using F_2 populations of IR68301S × Supanburi 91062. These markers are useful tool for developing new TGMS lines by marker-assisted selection. There were ten genes located between the two flanking markers RM12676 and 2gAP0050058. Using quantitative real-time PCR for expression analysis, 7 of the 10 genes showed expression in panicles, and response to temperatures. These genes could be the candidate gene controlling TGMS in IR68301S.

关键词： hybrid rice thermo-sensitive genic male sterility insertion/deletion simple sequence repeat marker-assisted selection