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Numerical simulation of flow field characteristics and the improvement of pressure oscillation of rotating detonation engine

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Defence Technology（防务技术） 2023年第8期26卷 191-202页

作者： Xin-pei han Quan Zheng bao-xing Li Qiang Xiao han Xu Fang Wang Hao-long Meng Wen-kang Feng Chun-sheng Weng National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing210094China Xi'an Modern Chemistry Research Institute Xi'an710065China

Due to the inherent working mode of rotating detonation engine(RDE),the detonation flow field has the characteristics of pressure oscillation and axial kinetic energy loss,which makes it difficult to design nozzle and improve propulsion ***,in order to improve the characteristics of detonation flow field,the three-dimensional numerical simulation of annular chamber and hollow chamber is carried out with premixed hydrogen/air as fuel in this paper,and then tries to combine the two chambers to weaken the oscillation characteristics of detonation flow field through the interaction of detonation flow field,which is a new method to regulate the detonation flow *** results show that there are four states of velocity vectors at the outlet of annular chamber and hollow chamber,which makes RDE be affected by rolling moment and results in the loss of axial kinetic *** the external flow field of combined chamber,the phenomenon of cyclic reflection of expansion wave and compression wave on the free boundary is observed,which results in Mach disk ***,the pressure monitoring points are set at the external flow *** pressure signal shows that the high-frequency pressure oscillation at the external flow field of the combined chamber has been greatly *** to the annular chamber,the relative standard deviation(RSD) has been reduced from 14.6% to5.6%.The results thus demonstrate that this method is feasible to adjust the pressure oscillation characteristics of the detonation flow field,and is of great significance to promote the potential of RDE and nozzle design.

关键词： Detonation flow field Combined chamber Pressure oscillation Velocity vector

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Effect of Ageing at 700℃ on Microstructure and Mechanical Properties of S31042 Heat Resistant Steel

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Journal of Iron and Steel Research International 2013年第4期20卷 54-58页

作者： WANG Jing-zhong LIU Zheng-dong bao han-sheng CHENG Shi-chang WANG Bin School of Metallurgy and Engineering Xi'an University of Architecture and Technology Institute for Structural Materials China Iron and Steel Research Institute Group

To investigate the effect of high temperature ageing on the microstructure and mechanical properties of S31042steel,solid solution treatment at 700℃ was carried out for various time from 10to 6 *** results showed that the change of mechanical properties is closely related to the amount of precipitated *** ageing from 10to 300h,precipitation in the tested steel increases rapidly,and correspondingly,the high temperature yield strength and room temperature hardness of tested steel increase ***,the thickness of the secondary phase on grain boundaries widens sharply and the room temperature Charpy impact absorb energy *** beyond 300h,the precipitation in the steel increases gradually and the precipitates coarsen to a certain *** high temperature yield strength of the steel keeps stable,and the room temperature Charpy impact energy and hardness decrease *** beyond 3 000h,the mechanical properties of the steel tend to be *** main precipitates are M23C6,NbCrN and NbC in the tested steel.

关键词： ageing microstructure mechanical property precipitated phase

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Research on Formal Degree Evaluation and Analysis for Domain Software Based on Evidence

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Chinese Journal of Electronics 2016年第5期25卷 793-800页

作者： bao Tie LIU Shufen han Lu College of Computer Science and Technology Jilin University

Existing researches fail to involve formalized methods in evaluation and analysis of domain software and lack analysis on formal degree, this paper comes up with a formal degree evaluation approach for domain software based on evidence. Various levels of transformation models are mapped by formal analysis of evidence in life cycle of domain software so as to quantitatively measure degree of evidence. Evaluation model based on evidence is established by analyzing detailed evaluation requirement.A level model including mapping condition is established to describe formal degree at hierarchical level. This paper explains detailed evaluation process through an evaluation example. The approach stated in this paper can describe formal degree of domain software, evaluation data can support subsequent bottleneck analysis and trustworthy evolution, thus provide formal support for creditable construction and analysis.

关键词： Software evaluation Domain software Formal degree Evidence metrics

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Wave Force on the Crown Wall of Rubble Mound Breakwaters at Intermediate Depths

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Journal of Ocean University of China 2023年第1期22卷 53-64页

作者： han Xinyu DONG sheng College of Engineering Ocean University of ChinaQingdao 266100China

Rubble mound breakwaters with a crown wall are a common coastal engineering *** wave force on crown walls is an important parameter for the practice engineering ***,the wave force on crown walls under intermediate depths has been studied through physical model tests and numerical *** this study,a three-dimensional numerical wave flume was developed to investigate monochromatic wave interactions in a rubble mound breakwater with a crown *** blocks were modeled in *** Navier-Stokes equations for two-phase incompressible flows,combined with shear stress transport k-ωturbulence model and volume of fluid method for tracking the free surface,were solved.A set of laboratory experiments were performed to validate the adopted ***,a series of numerical simulations were implemented to examine the impacts of different hydrodynamic parameters(including wave height,incident wave period,and water depth)and the berm width on the wave force of the crown ***,a comparison of the experimental results and Martin method shows that the latter method is not suitable for this experimental *** empirical formulas are proposed to predict the wave force on crown walls under intermediate *** results can provide a basis for the design of crown wall of rubble mound breakwaters at intermediate depths.

关键词： wave force crown wall rubble mound breakwater intermediate depth experimental test numerical simulation

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Marginal donor liver versus standard donor liver: A single-center observational study

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Hepatobiliary & Pancreatic Diseases International 2023年第3期22卷 239-244页

作者： Si-Long Gao bao-Ying Mou De-Shu Dai Li han sheng-bao Zhao Chuan-Shen Xu Xiao Xu Jin-Zhen Cai Intensive Care Unit the Affiliated Hospital of Qingdao UniversityQingdao 266000China Operating Room the Affiliated Hospital of Qingdao UniversityQingdao 266000China Organ Transplantation Center the Affiliated Hospital of Qingdao UniversityQingdao 266000China Department of Spinal surgery the Affiliated Hospital of Qingdao UniversityQingdao 266000China National Center for Healthcare Quality Management of Liver Transplant Hangzhou 310003China

Background:The effectiveness and safety of marginal donor livers remain *** study aimed to investigate the clinical efficacy of marginal donor livers in patients with liver transplantation(LT).Methods:This study included 199 liver donors(including 16 split donors)and 206 liver recipients from January 1,2018 to January 27,2020,with case follow-up until July 31,*** data of donors and recipients were retrospectively analyzed and were divided into the marginal donor and standard donor groups according to the criteria of marginal donor *** of liver and kidney functions,complications,and survival curves of the two groups were ***:Compared with the standard donor group,the blood creatinine levels were significantly higher in the marginal donor group in the first week after operation(P0.05);there was no significant difference in the incidence of complications after LT(P>0.05);there was also no significant difference in the survival curve(P=0.335).Conclusions:There were no significant differences in liver and kidney function and survival curve between the standard donor and marginal donor *** marginal donor liver appears safe and reliable for LT and may be an important strategy to expand the donor pool and solve the shortage of organs.

关键词： Marginal donor Liver transplantation Liver function Organ donation

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Isolated scaphoid dislocation:A case report and review of literature

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World Journal of Clinical Cases 2022年第8期10卷 2559-2568页

作者： Si-Da Liu bao-sheng Yin Feng han Hua-Jun Jiang Wei Qu Department of Orthopedics The First Affiliated Hospital of Dalian Medical UniversityDalian 116011Liaoning ProvinceChina

BACKGROUND Isolated dislocations of the scaphoid are extremely rare types of injuries,commonly associated with severe ligament disruptions,and are occasionally *** options for dislocations of the scaphoid mainly include closed reduction,with or without internal fixation,and open reduction with ligament *** SUMMARY A 59-year-old male worker sustained a twisting trauma of his right wrist,caused by a moving belt while he was operating a *** he presented at our emergency department,the patient complained of swelling,tenderness,and restriction of movement of the right *** confirmed a primary complex partial radial dislocation of the scaphoid and some chip fractures of the capitate and *** reduction with K-wire internal fixation was performed with the assistance of arthroscopy,and an excellent prognosis was *** Arthroscopy-assisted reduction is a minimally invasive method to reduce the dislocated scaphoid and maintain the blood supply.

关键词： Isolated scaphoid dislocation Classification Delayed diagnose Treatment options Wrist arthroscopy Case report

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Effects of mu and kappa opioid receptor agonists and antagonists on contraction of isolated colon strips of rats with cathartic colon

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World Journal of Gastroenterology 2004年第11期10卷 1672-1674页

作者： bao-HuaLiu PingMo sheng-BenZhang DepartmentofGeneralSurgery DapingHospitalThirdMilitaryMedicalUniversityChongqing400042China

AIM: To study the effects of mu and kappa opioid receptor agonists and antagonists on the isolated colon strips of rats with cathartic colon. METHODS: Cathartic colon model was established by feeding rats with contact laxatives, and effects of mu and kappa opioid receptor agonists and antagonists on electricity-stimulated contraction of isolated colon strips of rats with cathartic colon were observed. RESULTS: Compared with control group, exogenous mu and kappa agonists inhibited significantly electricity-stimulated contraction of strips of cathartic colon (8.50±0.89 mm, 6.24±0.91 mm, 3.35±0.6 mm vs 11.40±0.21 mm Phanced electricity-stimulated contraction of isolated colon strips (13.18±0.93 mm, 15.87±0.98 mm, 19.46±1.79 mm vs 11.40±0.21 mm, P<0.01), but kappa antagonist had no effect on the isolated colon strips of rats with cathartic colon. CONCLUSION: Muand kappa opioid receptors are involved in the regulation of colon motility of rats with cathartic colon.

关键词：受体激动剂老鼠结肠带泻药消化系统 θ鸦片样受体

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Nanotip-induced ultrahigh pressure-sensitive cement-based composite and its pressure-sensitive characteristic model

Nanotip-induced ultrahigh pressure-sensitive cement-based co...

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第八届中国功能材料及其应用学术会议

作者： han bao-guo SUN sheng-wei OU Jin-ping School of Civil Engineering Dalian University of Technology School of Civil Engineering Harbin Institute of Technology

ISBN: (纸本)9783037859698

A smart composite is fabricated from cement-matrix and spiky spherical nickel *** electrical resistivityof such composite decreases69.00%under uniaxial *** gage factor of this composite ishigherthan 895.45 within the elastic *** ultrahigh pressure-sensitivityis attributed to the unique needle-like surface morphology of nickel *** the normal smooth spherical nickel particles,the needle-like features of spiky spherical nickel particles can induce field emission and tunneling effects,which leads tohighly sensitive responses to strain.A constitutive model relating the change in electrical resistivity to strainof thecomposite is built within the elastic *** model incorporates the field emission effect and the interparticle separation change of nickel powders in *** model is used to predict the pressure-sensitive characteristic behavior of the *** predicted result is compared with the experimental data obtained on the composite,and good agreement is obtained.

关键词： Cement-based composite Spiky spherical nickel powder Pressure-sensitivity Field emission effect Tunneling effect Pressure-sensitive characteristic model

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Memristive cyclic three-neuron-based neural network with chaos and global coexisting attractors

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Science China(Technological Sciences) 2022年第11期65卷 2582-2592页

作者： bao han CHEN ZhuGuan CAI JianMing XU Quan bao BoCheng School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China

It has been documented that a cyclic three-neuron-based neural network with resistive synaptic weights cannot exhibit *** this end,a memristive cyclic three-neuron-based neural network is presented using a memristive weight to substitute a resistive *** memristive cyclic neural network always has five equilibrium points within the parameters of interest,and their stability analysis shows that they are one index-2 saddle-focus,two index-1 saddle-foci,and two stable node-foci,*** analyses are performed for the memristive cyclic neural network by several numerical simulation *** results demonstrate that the memristor synapse-based neural network with the simplest cyclic connection can not only exhibit chaos,but also present global coexisting attractors composed of stable points and unstable periodic or chaotic orbits under different initial ***,with the designed implementation circuit,Multisim circuit simulations and hardware experiments are executed to validate the numerical simulations.

关键词： memristive weight cyclic neural network chaos coexisting attractors hardware experiment

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Multi-objective collaborative optimization of metallurgical properties of iron carbon agglomerates using response surface methodology

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International Journal of Minerals,Metallurgy and Materials 2021年第12期28卷 1917-1928页

作者： Ji-wei bao Zheng-gen Liu Man-sheng Chu Dong han Lai-geng Cao Jun Guo Zi-chuan Zhao School of Metallurgy Northeastern UniversityShenyang 110819China Institute for Frontier Technologies of Low-carbon Steelmaking Northeastern UniversityShenyang 110819China Liaoning Province Engineering Research Center for Technologies of Low-Carbon Steelmaking Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Iron carbon agglomerates(ICA)are used to realize low-carbon blast furnace *** this study,the central composite design based on response surface methodology was used to synergistically optimize the compressive strength,reactivity,and post-reaction strength of *** show that the iron ore addition ratio significantly influences the compressive strength,reactivity,and post-reaction strength of *** iron ore addition ratio and carbonization temperature or the iron ore addition ratio and carbonization time exert significant interaction effects on the compressive strength and reactivity of ICA,but it has no interaction effects on the post-reaction strength of *** addition,the optimal process parameters are as follows:iron ore addition ratio of 15.30 wt%,carbonization temperature of 1000℃,and carbonization time of 4.27 *** model prediction results of compressive strength,reactivity,and post-reaction strength are 4026 N,55.03%,and 38.24%,respectively,which are close to the experimental results and further verify the accuracy and reliability of the models.

关键词： strength carbon surface

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