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Raman spectroscopy and quantum chemical calculation on YCl_(3)-KCl molten salt system

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Rare Metals 2023年第11期42卷 3886-3896页

作者： Can Xu xian-wei hu Jiang-Yu Yu Peng-wei Li Ai-Min Liu Shao-hua Luo Zhong-Ning Shi Zhao-Wen Wang Key Laboratory Ecological Metallurgy of Multimetallic Mineral‘Ministry of Education’ School of MetallurgyNortheastern UniversityShenyang110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China School of Materials Science and Engineering Northeastern UniversityShenyang110819China Department of Chemistry and Bioscience Aalborg University9220AalborgDenmark

The knowledge on the ionic structure of YCl_(3)-KCl molten system is of guiding significance for the practical production of yttrium metals and yttrium alloys via molten salt electrolysis using this system as *** this paper,the theoretical Raman spectra of the ionic groups which may exist in YCl_(3)-KCl molten system are simulated by quantum chemical calculation using Gaussian09 and Gauss View 5.0 programs based on density functional theory(DFT).Then the ionic structures of 20 mol%-60 mol%YCl_(3)-KCl molten salt systems are studied by comparing the Raman shift values of the bands in the theoretical Raman spectra of different ionic groups with the experimental spectra of this ***_(6)^(3-),Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)are thought to exist in the molten *** the increase of temperature,the relative content of YCl_(6)^(3-)ionic groups increases while those of Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)ionic groups ***,the"lifetime"of all ionic groups decreases within the temperature range of 692-730℃.Meanwhile,the relative contents of Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-)and Y_(2)Cl_(9)^(3-)increase with the increase of YCl_(3)content,while that of YCl_(6)^(3-)*** wave function analysis of the four ionic groups(YCl_(6)^(3-),Y_(2)Cl_(7)^(-),Y_(2)Cl_(8)^(2-),and Y_(2)Cl_(9)^(3-))is carried out by Multiwfn *** net charge in each group,the direction of electron migration during the formation of each group,the sites where electrophilic and nucleophilic reactions are most likely to occur in each ionic group,and the order of bond breaking during chemical reactions for the four groups are obtained.

关键词： YCl_(3)-KCl molten salt Ionic structure Raman spectroscopy Quantum chemical calculation Wave function analysis

Flexural behavior of textile reinforced mortar-autoclaved lightweight aerated concrete composite panels

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Frontiers of Structural and Civil Engineering 2024年第5期18卷 776-787页

作者： Liying GUO Mingke DENG wei ZHANG Tong LI Yangxi ZHANG Mengyu CAO xian hu Department of Civil Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Key Lab of Structural Engineering and Earthquake Resistance Ministry of Education(XAUAT)Xi’an 710055China Scene engineering design institute Xi’an 710016China Dahua Group Shang hai 200062China

To improve the deficiencies of prefabricated autoclaved lightweight aerated concrete(ALC)panel such as susceptibility to cracking and low load-bearing capacity,a textile-reinforced mortar-autoclaved lightweight aerated concrete(TRM-ALC)composite panel was developed in this *** group of reference ALC panels and five groups of TRM-ALC panels were fabricated and subjected to four-point flexural *** was applied on the tensile side of the ALC panels to create *** variable parameters were the plies of textile(one or two),type of textile(basalt or carbon),and whether the matrix(without textile)was applied on the compression side of *** results showed that a bonding only 8-mm-thick TRM layer on the surface of the ALC panel could increase the cracking load by 180%−520%.The flexural capacity of the TRM-ALC panel increased as the number of textile layers *** reinforcement of the matrix on the compressive side could further enhance the stiffness and ultimate loadbearing capacity of the TRM-ALC *** panels with basalt textile failed in flexural mode,with the rupture of fabric *** with carbon textile failed in shear mode due to the ultra-high tensile strength of *** addition,analytical models related to the different failure modes were presented to estimate the ultimate load-carrying capacity of the TRM-ALC panels.

关键词： prefabricated autoclaved lightweight aerated concrete panel textile-reinforced mortar cracking load flexural capacity stiffness

A light-through-side cell and co-used furnace designed for micro-Raman spectra study on volatile melts

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Chinese Chemical Letters 2012年第11期23卷 1291-1294页

作者： xian wei hu huan Li Bing Liang Gao Jing Jing Liu Zhong Ning Shi Jiang Yu Yu Zhao Wen Wang School of Materials and Metallurgy Northeastern UniversityShenyang 110004China

A new type of sample cell specially designed for micro-Raman spectra study on volatile melts is described. The cell is made of quartz. The lower section of the cell is circular ring-shaped and the one-end-closed hole in the cell is used for locating the heating body. The tube attached to the cell lid for placing the thermal couple is inserted into the sample, which ensures that the temperature measurement accuracy is good. The cell can be sealed for reducing the effect of the composition change caused by the in_homogeneous volatilization. During the Raman spectra scanning, the laser beam is transmitted into the cell through the side but not the top. Meanwhile, a furnace has been designed to match the cell. The heating body is closely coupled with the sample cell, and there is a hole on the side wall of the furnace for the entrance of the microlens. The assembly has performed well in the tested Raman spectrum measurement of molten NaNO3 at 602 ℃.

关键词： Light-through-side cell Raman spectroscopy Volatile melts Comer microlens Cell-around-heating body furnace

Comparative analysis of the characteristics of outlet short circuit and winding insulation fault of distribution transformer and its preventive measures

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High Voltage 2024年第3期9卷 700-709页

作者： Richang xian Yuyao hu Bingqian Zhang Qingyu Rong Rujie Zhao wei Wang Yang Guo Yunhao Li College of Electrical and Electronic Engineering Shandong University of TechnologyZiboChina State Grid of China Technology College JinanChina Shandong huineng Electric Co. Ltd.ZiboChina

Outlet short circuit on the low-voltage(LV)side and winding inter-turn short circuit faults are hazardous to transformer *** investigate the formation mechanism of winding insulation faults of distribution transformer,ANSYS Maxwell was used to build a coupled magnetic field-circuit model with the same structural dimension as the actual distribution *** outlet short circuit and winding inter-turn insulation faults were set by using the voltage-controlled switch in the external circuit of the ***-sequently,the differences in the electromagnetic characteristics and the electrodynamic force distributions of the windings under three operating conditions,namely,nominal load,three-phase outlet short circuit on the LV side and inter-turn insulation failure were studied,*** results show that compared with the rated load,in the cases of outlet short circuit and inter-turn insulation faults,the amplitude of winding current in-creases by 20 and 50 times,the magnetic field strength grows by 20 and 17 times,and the electrodynamic force rises by 400 and 230 times,*** short circuit fault is more likely to cause the winding instability and deformation,and inter-turn short circuit fault can easily burn out winding ***,corresponding preventive measures were proposed.

关键词： fault characteristics winding

Gastric Cancer Screening by Combined Determination of Serum Helicobacter pylori Antibody and Pepsinogen Concentrations： ABC Method for Gastric Cancer Screening

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Chinese Medical Journal 2018年第10期131卷 1232-1239页

作者： xian-Zhe Chen Cheng-Zhi huang wei-xian hu Ying Liu Xue-Qing Yao Second Clinical Medical College Southern Medical University Guangzhou Guangdong 510515 China Department of General Surgery Guangdong General Hospital Guangdong Academy of Medical Sciences Guangzhou Guangdong 510080 China Medical College Shantou University Shantou Guangdong 515063 China Reproductive Department Guangdong General Hospital Guangdong Academy of Medical Sciences Guangzhou Guangdong 510080 China

Objective：Gastroscopy combined with gastric mucosa biopsies is currently regarded as a gold standard for diagnosis of gastric ***,its application is restricted in clinical practice due to its invasive property.A new noninvasive population screening process combining the assay ofanti-Helicobacterpylori antibody and serum pepsinogen （PG）（ABC method） is adopted to recognize the high-risk patients for further endoscopy examination,avoiding the unnecessary gastroscopy for most population and saving the cost consumption for mass screening ***,controversies exist for the grouping of ABC method and the intervals of gastroscopy surveillance for each *** this review,we summarized these popular concerned topics for providing useful references to the healthcare practitioner in clinical *** Sources：The PubMed databases were systematically searched from the inception dates to November 22,2017,using the keywords ＂Helicobacterpylori,＂＂Pepsinogens,＂ and ＂Stomach Neoplasms.＂Study Selection：Original articles and reviews on the topics were ***：*** antibody and serum PG concentration showed significant changes under the different status *** infection and the progression of atrophic gastritis,which can be used for risk stratification of gastric cancer in *** addition,anti-H,pylori antibody titer can be used for further risk stratification of gastric cancer contributing to determine better endoscopy surveillance ***：The early detection and diagnosis of gastric cancer benefit from the risk stratification,but the cutoff values for *** antibody and serum PG concentration require further modification.

关键词： Gastroscopy Surveillance Helicobacterpylori Antibody Pepsinogens Risk Stratification Stomach Neoplasms

Microstructure and mechanical properties of Ti/Al/Ti clad plates prepared via powder-in-tube method

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Journal of Iron and Steel Research International 2024年第3期31卷 670-687页

作者： xian-lei hu Qin-cheng Xie Yi Yuan Ying Zhi State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Suzhou Dongbao Haixing Metal Material Technology Co. Ltd.Suzhou 215600JiangsuChina School of Material Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina

The Ti/Al/Ti clad plates exhibit a broad spectrum of potential ***,the conventional techniques of hot-pressing composite and explosive composite are intricate and environmentally hazardous.A novel method was introduced for preparing clad plates,namely,the powder-in-tube *** method involves a combination of cold rolling,annealing at a temperature of 550℃,and double *** morphology of the intermetallic compound layer was analyzed through the utilization of interface stripping test,tensile test,and microscopic *** interface morphology,interface bonding properties,tensile fracture structures,and properties of plates under the first and second rolling were compared,along with the effects of intermetallic compounds on the interface *** results indicate that the powder-in-tube method,when annealed at 550℃,can produce a composite plate featuring a complete and uniform Ti/Al *** obtained plate exhibits a peeling strength of 21.5 N/mm,tensile strength of 424 MPa,and elongation of 11.5%.Furthermore,a systematic analysis was conducted to determine the causes of performance degra-dation observed during annealing at temperatures of 600 and 650℃.

关键词： Powder-in-tube method-Ti/Al/Ti clad plate Annealing Cold rolling-Mechanical property

Investigation of mechanical and electrical characteristics of selfsensing pneumatic torsional actuators

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Science China(Technological Sciences) 2024年第1期67卷 130-142页

作者： XIAO wei hu DeAn hu GuoLiang XIAO Yihua Key Laboratory of Conveyance and Equipment Ministry of EducationEast China Jiaotong UniversityNanchang 330013China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of EducationHunan UniversityChangsha 410082China

Soft pneumatic actuators are one of the most promising actuation for soft robots,and great achievements have been *** it remains challenging to endow sensing capabilities to pneumatic actuators,especially for the sensing ability originating directly from the actuator ***,a self-sensing pneumatic torsional actuator(SPTA)is designed based on the electromagnetic induction effect and magnetically responsive *** SPTA can generate feedback voltage and current with the deformation,in which the sensing function comes from its inherent *** investigate the mechanical and electrical characteristics,an experimental platform and a finite element model are established,*** find that the torsion angle and output torque increase in nonlinear with the actuating *** maximum torsion angle is 66.35°,which is 84.34%of that for the actuator fabricated by pure *** maximum output torque(24.9 N mm)improves by 23.19%compared with the actuator made by pure *** regards the electrical characteristics,the maximum feedback voltage and current are 2.90μV and 29.50 nA when the SPTA is actuated by a pressure of−40 *** also demonstrate that the relationship between the torsion angle and the magnetic flux change is approximately ***,the number of turns of wires,magnetic powders contents,and magnetic direction on the feedback voltage and current are *** show that the feedback voltage and current can be enhanced by increasing the number of turns and magnetic powders *** envision that the SPTA would be promising for soft robots to realize their accuracy control and intelligentization.

关键词： pneumatic torsional actuators self-sensing feedback voltage finite element modeling soft robots

Particle distributions in Lamb wave based acoustofluidics

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Nanotechnology and Precision Engineering 2024年第2期7卷 60-68页

作者： Chuanchao Zhang xian Chen wei wei Xuejiao Chen Quanning Li Xuexin Duan Key Laboratory of Precision Measuring Technology and Instruments College of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin300072China

Acoustic streaming enabled by a Lamb wave resonator(LWR)is efficient for particle trapping and enrichment in microfluidic ***,because Lamb waves combine the features of bulk acoustic waves and surface acoustic waves,the resulting acoustic streaming in the LWR occurs in multiple planes,and the particle flow behavior in this acoustofluidic system is largely *** here are numerical simulations and laboratory experiments conducted to investigate the boundary conditions for particle motion inside a microvortex induced by an *** dynamic capture,the particles’trajectories become orbital paths within an acoustic *** suspended particles encounter two distinct acoustic phenomena,i.e.,the drag force resulting from acoustic streaming and the acoustic radiation force,which exert forces in various directions on the *** the acoustic radiation force and the fluid drag force are dominant for large and small particles in a mixed solution,respectively,the large particles reside within the vortex while the small particles remain at its ***,when the acoustic radiation force is dominant for both types of particles,the distribution pattern is reversed.

关键词： Acoustofluidics Lamb wave resonator Particle manipulation Microvortex

Microstructure Evolution and Nanomechanical Behavior of Micro-Area in Molten Pool of Selective Laser Melting(CoCrNi)_(82)Al_(9)Ti_(9)High-Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1019-1033页

作者： Hong-wei Zhang Li-wei Lan Zhe-Yu Yang Chang-Chun Li Wen-xian Wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced MaterialsTaiyuan University of TechnologyTaiyuan030024China Shanxi-Zhejiang University New Materials and Chemical Research Institute Taiyuan030032China

In this work,the phase evolution mechanism and nanomechanical properties of(CoCrNi))(82)Al_(9)Ti_(9)high-entropy alloy(HEA)prepared by selective laser melting(SLM)in the molten pool were *** HEA contains multiple primary elements and undergoes high-temperature gradient and rapid cooling during *** leads to significant inhomogeneity of nano-scale microstructure characteristics and instability of *** optimizing process parameters,the microstructure evolution at the optimal parameter volume energy density of 440 J/mm^(3)was studied.A phase transition from BCC to FCC occurred in the melt *** the micro-area of the melt pool results in a temperature rise and the combustion-induced loss of Al ***,the Ni element content increases significantly outside the melt *** process enhances the phase stability of FCC and facilitates phase ***,rapid cooling leads to the formation of distinctive ultrafine equiaxial crystals inside the melt pool,accompanied by the generation of intracrystalline needle-like nano-scale *** the melt pool,the accumulation of energy results in the formation of coarse ***,the nano-hardness inside the molten pool is remarkably high at 11.79 GPa,while the outside the molten pool is reduced to 9.58 *** the fracture toughness outside the melt pool also *** with inside the melt pool,the residual stress outside the melt pool changed from compressive to tensile stress and decreased from 603.28 to 322.84 MPa.

关键词： High-entropy alloys Selective laser melting Microstructure evolution Nanoindentation