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A flexible multiscale algorithm based on an improved smoothed particle hydrodynamics method for complex viscoelastic flows

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Applied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1387-1402页

作者： Jinlian ren Peirong LU tao JIANG Jianfeng LIU Weigang LU College of Mathematical Science Yangzhou UniversityYangzhou 225002Jiangsu ProvinceChina College of Hydraulic Science and Engineering Yangzhou UniversityYangzhou 225002Jiangsu ProvinceChina

Viscoelastic flows play an important role in numerous engineering fields,and the multiscale algorithms for simulating viscoelastic flows have received significant attention in order to deepen our understanding of the nonlinear dynamic behaviors of viscoelastic ***,traditional grid-based multiscale methods are confined to simple viscoelastic flows with short relaxation time,and there is a lack of uniform multiscale scheme available for coupling different solvers in the simulations of viscoelastic *** this paper,a universal multiscale method coupling an improved smoothed particle hydrodynamics(SPH)and multiscale universal interface(MUI)library is presented for viscoelastic *** proposed multiscale method builds on an improved SPH method and leverages the MUI library to facilitate the exchange of information among different solvers in the overlapping *** test the capability and flexibility of the presented multiscale method to deal with complex viscoelastic flows by solving different multiscale problems of viscoelastic *** the first example,the simulation of a viscoelastic Poiseuille flow is carried out by two coupled improved SPH methods with different spatial *** effects of exchanging different physical quantities on the numerical results in both the upper and lower domains are also investigated as well as the absolute errors in the overlapping *** the second example,the complex Wannier flow with different Weissenberg numbers is further simulated by two improved SPH methods and coupling the improved SPH method and the dissipative particle dynamics(DPD)*** numerical results show that the physical quantities for viscoelastic flows obtained by the presented multiscale method are in consistence with those obtained by a single solver in the overlapping ***,transferring different physical quantities has an important effect on the numerical results.

关键词： multiscale method improved smoothed particle hydrodynamics(SPH) dissipative particle dynamics(DPD) multiscale universal interface(MUI) complex viscoelastic flow

Progress of neutron induced prompt gamma analysis technique in 1988～2003

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Nuclear Science and Techniques 2004年第2期15卷 119-122页

作者： JINGShi-Wei LIUYu-ren CHIYan-tao TIANYu-Bing CAOXi-Zheng ZHAOXin-Hui renWan-Bin LIULin-Mao PhysicsDepartment NortheastNormalUniversityChangchun130024

This paper described new development of the neutron induced prompt gamma-ray analysis(NIPGA) technology in *** pulse fast-thermal neutron activation analysis method,which utilized the inelastic reaction and capture reaction jointly,was employed to measure the elemental contents more *** of the neutron generator was more than 10000h and the performance of detector and MCA reached a high *** the same time,Monte Carlo library least-square method was used to solve the nonlinearity problem in the NIPGA.

关键词：中子诱导瞬发γ射线分析 NIPGA 俘获反应非弹性反应 MonteCarlo仿真

Pulsed current-assisted twelve-roll precision rolling deformation of SUS304 ultra-thin strips with exceptional mechanical properties

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International Journal of Extreme Manufacturing 2024年第4期6卷 291-305页

作者： Wanwan Fan tao Wang Jinxiong Hou Zhongkai ren Qingxue Huang Guanghui Wu College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyYingze West Street 79Taiyuan 030024Shanxi ProvincePeople's Republic of China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment of Ministry of Education Taiyuan University of TechnologyYingze West Street 79Taiyuan 030024Shanxi ProvincePeople's Republic of China National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyYingze West Street 79Taiyuan 030024Shanxi ProvincePeople's Republic of China College of Aeronautics and Astronautics Taiyuan University of TechnologyYingze West Street 79Taiyuan 030024Shanxi ProvincePeople's Republic of China

Innovative pulsed current-assisted multi-pass rolling tests were conducted on a 12-roll mill during the rolling deformation processing of SUS304 ultra-thin *** results show that in the first rolling pass,the rolling reduction rate of a conventionally rolled sample(at room temperature)is 33.8%,which can be increased to 41.5%by pulsed current-assisted rolling,enabling the formation of an ultra-thin strip with a size of 67.3μm in only one rolling *** three passes of pulsed current-assisted rolling,the thickness of the ultra-thin strip can be further reduced to 51.7μ*** clearly compare the effects of a pulsed current on the microstructure and mechanical response of the ultra-thin strip,ultra-thin strips with nearly the same thickness reduction were *** was found that pulsed current can reduce the degree of work-hardening of the rolled samples by promoting dislocation detachment,reducing the density of stacking faults,inhibiting martensitic phase transformation,and shortening the total length of grain *** a result,the ductility of ultra-thin strips can be effectively restored to approximately 16.3%while maintaining a high tensile strength of 1118 ***,pulsed current-assisted rolling deformation shows great potential for the formation of ultra-thin strips with a combination of high strength and ductility.

关键词： pulsedcurrent-assisted SUS304 ultra-thinstrip rolling reductionrate work-hardening mechanical properties

滇西北普朗斑岩型矿床钾硅酸盐带的形成及与矿化关系研究

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地质与勘探 2024年第4期60卷 673-684页

作者：施宝生吴练荣李志鹏杨帆王雷任涛管申进管经纬朱振东李盛云南迪庆有色金属有限责任公司云南迪庆674400 中铜矿产资源有限公司云南昆明650051 昆明理工大学国土资源工程学院云南昆明650093

云南普朗超大型斑岩铜金矿床位于我国西南三江特提斯构造域义敦岛弧南部的中甸岛弧内。为了探讨该矿床钾硅酸盐带矿物特征、形成机制及与矿体的关系,为下一步深部和外围找矿勘查工作提供依据,本研究开展了二长斑岩X射线衍射光谱(XRD)和... 详细信息

云南普朗超大型斑岩铜金矿床位于我国西南三江特提斯构造域义敦岛弧南部的中甸岛弧内。为了探讨该矿床钾硅酸盐带矿物特征、形成机制及与矿体的关系,为下一步深部和外围找矿勘查工作提供依据,本研究开展了二长斑岩X射线衍射光谱(XRD)和长石类矿物主量成分测试。结果显示赋矿二长斑岩中钾长石平均含量为26.2%,斜长石为26.7%,石英和黑云母分别为~16.1%和~14.4%。在系统野外调查和室内观察的基础上,根据其形成机制,本研究将该矿床含矿二长斑岩中的长石划分为三类,即岩浆期结晶的原生长石(原生斜长石Pl1和原生钾长石Kfs1)、次生长石(热液蚀变成因,Pl2和Kfs2)和热液结晶长石(Pl3和Kfs3)。Pl1具有高铝(Al_(2)O_(3)=22.61%~27.27%)和钙(CaO=3.68%~9.29%),低硅(SiO_(2)=56.09%~63.89%)和钠(Na_(2)O=6.31%~9.27%)的特征;Pl3具有高硅(SiO_(2)=67.07%~68.97%)和钠(Na_(2)O=11.02%~11.99%)的特征;Pl2中SiO_(2)、Al_(2)O_(3)、CaO和Na_(2)O含量变化较大,主要分布于Pl1和Pl3之间,呈现出二者混合的特点。Kfs1~Kfs3元素含量变化较小,SiO_(2)、K_(2)O、Na_(2)O和Al_(2)O_(3)分别为62.75%~64.69%、15.42%~16.89%、0.20%~1.03%和17.93%~19.19%。与原生钾长石相比,次生钾长石中钾含量没有增加反而减少,说明流体中钾可能相对较为亏损,这可能是普朗矿床钾硅酸盐化带中次生钾长石发育较弱的主要原因。青磐岩化的叠加改造,特别是黄铜矿±绿帘石±绿泥石脉发育显著提高了该矿床的铜品位,增加了铜储量。

关键词：蚀变分带矿物地球化学矿床成因钾硅酸盐带斑岩型普朗矿床滇西北

Influence of Repetitive Impulse Waveforms on Surface Discharge Characteristics and Insulation Life for Polyimide Film

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 746-755页

作者： Zhiyun Han Qingmin Li Yujin Guo tao Liu Guojing Dong Hanwen ren State Key Laboratory of Alternate Electrical Power System with renewable Energy Sources North China Electric Power UniversityBeijing 102206China Electric Power Research Institute Beijing 100085China Inner Mongolia Electric Economy and Technology Academy Hohhot 010020China

Accelerated insulation aging problems under high frequency repetitive impulses in power electronic transformers are drawing more and more attention in modern power systems. Partial discharge (PD) characteristics including discharge inception voltage, phase distribution and statistical characteristics on polyimide (PI) surface under different impulse waveforms and the insulation life of PI films are studied in this paper. We carry out experiments based on PD and insulation lifetime test systems, using five different types of repetitive impulses, including three bipolar waves and two unipolar waves. The experimental results show that there is little variation in discharge inception voltage under different waveforms, but great variation in phase distribution and statistical characteristics of PD. In addition, insulation life is approximately the same under different waveforms with the same polarity, and the aging rate under bipolar waveforms is larger than that under unipolar waveforms. We explain the differences between the bipolar and unipolar waveforms on insulation life, which can be concluded that the surface charge under unipolar waveform accumulates more significnatly compared with bipolar waveform and decreases the electric filed strength in discharging the air gap and inhibits surface discharge from occurring.

关键词： Insulation life polyimide film power electronic transformer repetitive impulse surface discharge characteristics

Pancreatic paraganglioma with multiple lymph node metastases found by spectral computed tomography: A case report and review of the literature

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World Journal of Clinical Cases 2022年第31期10卷 11638-11645页

作者： Ting Li Rong-Qi Yi Gang Xie Dan-Ni Wang Yi-tao ren Kang Li Department of Medical Imaging North Sichuan Medical CollegeNanchong 637000Sichuan ProvinceChina Department of Radiology Chongqing General HospitalChongqing 401147China Department of Medical Imaging Chongqing Medical UniversityChongqing 400016China

BACKGROUND Primary pancreatic paraganglioma is exceedingly *** patients with pancreatic paraganglioma lack a typical clinical presentation,and the tumor is difficult to accurately differentiate from other pancreatic neuroendocrine tumors,making the misdiagnosis rate extremely *** excision is the primary treatment modality but is considered high *** of its rich vascularity,the tumor easily bleeds during surgery,especially malignant paragangliomas invading large blood ***,a thorough preoperative evaluation of the tumor is ***,we report a primary malignant pancreatic paraganglioma,the second such case in a young patient that was successfully resected *** SUMMARY A 26-year-old female patient was admitted to the hospital with unexplained abdominal ***-layer spectral-detector computed tomography(DLCT)revealed a mixed density mass in the pancreatic body and *** patient was transferred to our hospital after previous failed surgical resection at other *** patient and her family strongly desired *** a thorough preoperative evaluation and adequate preparation,a large mass with the greatest dimension of 8.0 cm was successfully *** final pathological diagnosis was malignant *** patient was discharged in good condition 2 wk *** The rare malignant pancreatic paraganglioma reported here was difficult to diagnose *** filling of the draining vein may be a crucial diagnostic imaging *** can provide more precise information for surgical resection through dual-energy imaging.

关键词： Spectral computed tomography Pancreas Paraganglioma Lymph node metastasis Case report

A Web-like Three-dimensional Binder for Silicon Anode in Lithium-ion Batteries

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Energy & Environmental Materials 2024年第1期7卷 21-27页

作者： Liyuan Li tao Li Yifan Sha Baozeng ren Lan Zhang Suojiang Zhang CAS Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Langfang Green Industrial Technology Center Langfang 065001China Henan Key Laboratory of Energy Storage Materials and Processes Zhengzhou Institute of Emerging Industrial TechnologyZhengzhou 450003China

Si anode is of paramount importance for advanced energy-dense lithium-ion batteries(LIBs).However,the large volume change as well as stress generates during its lithiation-delithiation process poses a great challenge to the long-term cycling and hindering its *** this work,a composite binder is prepared with a soft component,guar gum(GG),and a rigid linear polymer,anionic polyacrylamide(APAM).Rich hydroxy,carboxyl,and amide groups on the polymer chains not only enable intermolecular crosslinking to form a web-like binder,A2G1,but also realize strong chemical binding as well as physical encapsulating to Si *** resultant electrode shows limited thickness change of merely 9%on lithiation and almost recovers its original thickness on *** demonstrates high reversible capacity of 2104.3 mAh g^(-1)after 100 cycles at a current density of 1800 mA g^(-1),and in constant capacity(1000 mAh g^(-1))test,it also shows a long life of 392 ***,this soft-hard combining web-like binder illustrates its great potential in the future applications.

关键词： anionic polyacrylamide lithium-ion batteries Si anode thickness change web-like binder

A novel subset assignment and matching method for DIC measurement of complex deformation in aircraft braking process

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Chinese Journal of Aeronautics 2024年第8期37卷 373-387页

作者： Xin SHI Xiang GUO tao SUO Yingtao YUAN Hongli HE Zhiyong ren School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China International Research Laboratory of Impact Dynamics and its Engineering Application Xi’an 710072China Institute of Extreme Mechanics Northwestern Polytechnical UniversityXi’an 710072China Chinese Flight Test Establishment Xi’an 710089China

This paper proposes a measurement method related to the braking deformation of a complex *** the braking process,the deformation of the wheel includes large amounts of movement,vibration,warping,and distortion.A novel subset assignment and correlation method is proposed to measure the complex *** proposed method can greatly improve the accuracy and stability of the calculation of complex deformations by simplifying the complex deformation into translational deformations in logarithmic coordinate *** to the simulation and actual experiments,the proposed method can be utilized to measure the deformations of up to 100%tensile strain under complex *** to the accuracy verification experiment,the error of the proposed method is less than 50 *** results show that the proposed method can effectively carry out structural deformation measurement in the complex motion and deformation *** proposed method has great significance for structural performance analysis and optimization design considering complex motion and deformation.

关键词： Complex deformation Measurement Digital image correlation Aircraft braking Deformation field

Characterizations and Photothermal Properties of Narrow Bandgap Conjugated Polymer Nanoparticles

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Chinese Journal of Polymer Science 2020年第8期38卷 814-818,I0005页

作者： Yu-Lin Zhang Jun-tao ren Huai-Yu Gao Jia-Wei Liu Wen-Jie Xia Wen-Qiang Qiao Zhi-Yuan Wang State Key Laboratory of Fine Chemicals Department of Polymer Science&MaterialsSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchun 130022China Department of Chemistry Carleton UniversityOntario K1S 5B6Canada

Photothermal therapy(PTT)is a minimally invasive treatment that kills cancer cells by converting photon energy into *** past few decades have witnessed the booming development of photothermal materials,mainly focusing on precious metal nanomaterials and carbon nanomaterials,such as nanogold and silver and nanocarbon materials for near-infrared(NIR)light-triggered *** precious metals are expensive and potentially harmful to humans,exploration and development of a new type of photothermal materials has become a research hotspot in this ***,we report narrow bandgap conjugated polymer nanoparticles(PDPP NPs)based on pyrrolo[3,4-c]pyrrole-1,4-dione(DPP)with intense NIR absorption at 900 nm,as well as a photothermal energy conversion efficiency of 75%.This polymer nanoparticle is essentially non-toxic,as the cell viability of mouse remained more than 90%,even when the concentration of PDPP NPs was at 0.5 mg·mL^-1.

关键词： Conjugated polymer Nanoparticle Photothermal property Biotoxicity