检索结果-南通市图书馆

Frontiers of Mechanical Engineering 2018年第4期13卷 513-519页

作者： Lianzhong ZHANG Dichen LI Shenping YAN ruidong xie Hongliang QU State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China

The mechanical properties of 316L stainless steel repaired with Fe314 under different temperatures and humidities without inert gas protection were studied. Results indicated favorable compatibility between Fe314 and 316L stainless steel. The average yield strength, tensile strength, and sectional contraction percentage were higher in repaired samples than in 316L stainless steel, whereas the elongation rate was slightly lower. The different conditions of humiture environment on the repair sample exerted minimal influence on tensile and yield strengths. The Fe314 cladding layer was mainly composed of equiaxed grains and mixed with randomly oriented columnar crystal and tiny pores or impurities in the tissue. Results indicated that the hardness value of Fe314 cladding layer under different humiture environments ranged within 419-451.1 HVo.2. The field humimre environment also showed minimal impact on the average hardness of Fe314 cladding layers. Furthermore, 316L stainless steel can be repaired through laser cladding by using Fe314 powder without inert gas protection under different temperatures and humidity environments.

关键词： laser cladding repaired performance tensile strength temperature and humidity environment

Effects of Zr content on electrochemical performance of Ti/Sn-Ru-Co-ZrO_(x)electrodes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2181-2188页

作者： Linhui Chang Sheng Chen Xionghui xie Buming Chen Haihong Qiao Hui Huang Zhongcheng Guo ruidong Xu Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Research Center of Metallurgical Electrode Materials Engineering Technology Kunming 650106China Kunming Hendera Science and Technology Co. Ltd.Kunming 650106China North Night Vision Technology Research Institute Group Co. Ltd.Optical CompanyKunming 650093China

The low cell voltage during electrolytic Mn from the MnCl_(2) system can effectively reduce the power consumption.In this work,the Ti/Sn−Ru−Co−Zr modified anodes were obtained by using thermal decomposition oxidation.The physical parameters of coatings were observed by SEM(scanning electron microscope).Based on the electrochemical performance and SEM/XRD(X-ray diffraction)of the coatings,the influence of Zr on electrode performance was studied and analyzed.When the mole ratio of Sn−Ru−Co−Zr is 6:1:0.8:0.3,the cracks on the surface of coatings were the smallest,and the compactness was the best due to the excellent filling effect of ZrO_(2)nanoparticles.Moreover,the electrode prepared under this condition had the lowest mass transfer resistance and high chloride evolution activity in the 1mol%NH_(4)Cl and 1.5mol%HCl system.The service life of 3102 h was achieved according to the empirical formula of accelerated-life-test of the new type anode.

关键词： Ti/Sn−Ru−Co−Zr anode electrochemical Mn electrowinning manganese chloride system service life

Numerical analysis on mechanical difference of sandstone under in-situ stress,pore pressure preserved environment at depth

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2023年第11期33卷 1339-1350页

作者： Hongwei Zhou Mingyuan Lu Heping xie Wenhao Jia ruidong Peng Yimeng Wang Bocen Chen Pengfei Jing School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen UniversityShenzhen 518060China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock mechanics.To investigate the effect of in-situ stress,pore pressure preserved environment on the mechanical difference of sandstone,four tests are numerically modeled by COMSOL:conventional triaxial test,conventional pore pressure test,in-situ stress restoration and reconstruction test,and in-situ pore pressure-preserved test(not yet realized in the laboratory).The in-situ stress restoration parameter is introduced to characterize the recovery effect of in-situ stress on elastic modulus and heterogeneous distribution of sandstone at different depths.A random function and nonuniform pore pressure coefficient are employed to describe the non-uniform distribution of pore pressure in the in-situ environment.Numerical results are compared with existing experimental data to validate the models and calibrate the numerical parameters.By extracting mechanical parameters from numerical cores,the stress-strain curves of the four tests under different depths,in-situ stress and pore pressure are compared.The influence of non-uniform pore pressure coefficient and depth on the peak strength of sandstone is analyzed.The results show a strong linear relationship between the in-situ stress restoration parameter and depth,effectively characterizing the enhanced effect of stress restoration and reconstruction methods on the elastic modulus of conventional cores at different depths.The in-situ pore pressurepreserved test exhibits lower peak stress and peak strain compared to the other three tests,and sandstone subjected to non-uniform pore pressure is more prone to plastic damage and failure.Moreover,the influence of non-uniform pore pressure on peak strength gradually diminished with increasing depth.

关键词： In-situ pore pressure-preserved environment Numerical simulation approach Deep in-situ rock mechanics In-situ stress restoration and reconstruction

基于RNA-seq技术挖掘影响鹅肝脏代谢的候选基因

在线全文

学校读者我要写书评

暂无评论

安徽科技学院学报 2024年第4期38卷 1-9页

作者：童鑫伟李梦梦谢飞李瑞东任曼李小金李升和安徽科技学院动物科学学院安徽凤阳233100 动物营养调控与健康安徽省重点实验室安徽凤阳233100

目的:通过分析不同体质量皖西白鹅肝脏组织转录组表达谱,挖掘影响肝脏代谢的差异表达基因及相关代谢通路,探究不同体质量皖西白鹅肝脏组织对营养物质转化利用和代谢的影响。方法:根据平均日增重将皖西白鹅进行分组,分为高(H)、中(M)、低... 详细信息

目的:通过分析不同体质量皖西白鹅肝脏组织转录组表达谱,挖掘影响肝脏代谢的差异表达基因及相关代谢通路,探究不同体质量皖西白鹅肝脏组织对营养物质转化利用和代谢的影响。方法:根据平均日增重将皖西白鹅进行分组,分为高(H)、中(M)、低(L)组,对每组样本进行转录组测序分析,挖掘各组之间的差异表达基因,并随机筛选6个差异基因进行荧光定量PCR验证。利用GO和KEGG数据库对挖掘的差异表达基因进行功能注释分析。结果:分别从H vs M、H vs L和M vs L组中筛选差异表达基因334、256、380个;这些差异基因主要参与的信号通路包括氨基酸代谢、脂质代谢、碳水化合物代谢等。结论:基于转录组测序技术对不同体质量皖西白鹅肝脏组织进行研究分析,筛选调控体质量的差异表达基因(UGP2、SCD、PNPLA2、SLC7A3、CHAC1)。这些差异基因主要通过脂质代谢和氨基酸代谢等相关通路来调控肝脏组织的物质代谢和转化,初步探究了肝代谢对鹅体质量影响的分子机制,为后期改善鹅的生产提供理论依据。

关键词：皖西白鹅体质量肝脏转录组测序

Research progress and application of deep in-situ condition preserved coring and testing

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2023年第11期33卷 1319-1337页

作者： Heping xie Yunqi Hu Mingzhong Gao Ling Chen Ru Zhang Tao Liu Feng Gao Hongwei Zhou Xiaobo Peng Xiongjun Li Jianbo Zhu Cunbao Li ruidong Peng Yanan Gao Cong Li Jianan Li Zhiqiang He State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China State Key Laboratory of Intelligent Construction and Health Operation and Maintenance of Deep Earth Engineering Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and UtilizationInstitute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610065China Frontier Science Research Center for Fluidized Mining of Deep Underground Resources China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China

With the depletion of shallow resources,the exploration of deep earth resources has become a global strategy.The study of the different patterns in the physical mechanical properties of rocks at different occurrence depths is the basis for exploring deep into the earth,with the core and premise being the acquisition and testing of deep in-situ core specimens.Based on the original idea of deep in-situ condition preserved coring(ICP-Coring)and testing,combined with theoretical modeling,numerical analysis,test platform development,indoor testing and engineering application,the principles and technologies of deep ICP-Coring are developed.This principle and technology consists of five parts:in-situ pressurepreserved coring(IPP-Coring),in-situ substance-preserved coring(ISP-Coring),in-situ temperaturepreserved coring(ITP-Coring),in-situ light-preserved coring(ILP-Coring),and in-situ moisturepreserved coring(IMP-Coring).The theory and technology of temperature and pressure reconstruction at different occurrence depths and in different environments are proposed,and prototype trial production was completed by following the principle of displacement and tests based on the in-situ reconstructed environment.The notable advances are as follows:(1)Deep in-situ coring system:A pressure-preserved controller with an ultimate bearing capacity greater than 140 MPa,highperformance(temperature-resistant,pressure-resistant,and low thermally conductive)temperaturepreserved materials,an active temperature control system,and high-barrier quality-preserved membrane materials were developed;a deep ICP-Coring capacity calibration platform was independently developed,a deep in-situ coring technology system was developed,and the acquisition of deep in-situ cores was realized.(2)In-situ storage displacement system:Following the dual-circuit hydraulic design idea,a single-drive source push-pull composite grabbing mechanism was designed;the design of the overall structure for the deep in-situ displacement storage system and ultrahigh pressure ca

关键词： Deep mining Deep in-situ Coring Displacement Test

Visualization of the complex structure and stress field inside rock by means of 3D printing technology

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第36期59卷 5354-5365页

作者： Yang Ju Heping xie Zemin Zheng Jinbo Lu Lingtao Mao Feng Gao ruidong Peng State Key Laboratory of Coal Resources and Safe Mining China University of Mining Technology State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining Technology College of Hydraulic and Hydroelectric Engineering Sichuan University School of Mechanics and Civil Engineering China University of Mining Technology

Accurate characterization and visualization of the complex inner structure and stress distribution of rocks are of vital significance to solve a variety of underground engineering problems. In this paper, we incorporate several advanced technologies, such as CT scan, three-dimensional(3D) reconstruction, and 3D printing, to produce a physical model representing the natural coal rock that inherently contains complex fractures or joints. We employ 3D frozen stress and photoelastic technologies to characterize and visualize the stress distribution within the fractured rock under uniaxial compression. The 3D printed model presents the fracture structures identical to those of the natural prototype. The mechanical properties of the printed model,including uniaxial compression strength, elastic modulus,and Poisson's ratio, are testified to be similar to those of the prototype coal rock. The frozen stress and photoelastic tests show that the location of stress concentration and the stress gradient around the discontinuous fractures are in good agreement with the numerical predictions of the real coalsample. The proposed method appears to be capable of visually quantifying the influences of discontinuous,irregular fractures on the strength, deformation, and stress concentration of coal rock. The method of incorporating3 D printing and frozen stress technologies shows a promising way to quantify and visualize the complex fracture structures and their influences on 3D stress distribution of underground rocks, which can also be used to verify numerical simulations.

关键词：打印技术地下岩石内部结构应力场可视化 3D 三维应力分布单轴压缩强度

Energy analysis and criteria for structural failure of rocks

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2009年第1期1卷 11-20页

作者： Heping xie Liyun Li ruidong Peng Yang Ju Sichuan University Chengdu 610065 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Teehnology Beijing 100083 China

The intrinsic relationships between energy dissipation,energy release,strength and abrupt structural failure are key to understanding the evolution of deformational processes in rocks.Theoretical and experimental studies confirm that energy plays an important role in rock deformation and failure.Dissipated energy from external forces produces damage and irreversible deformation within rock and decreases rock strength over time.Structural failure of rocks is caused by an abrupt release of strain energy that manifests as a catastrophic breakdown of the rock under certain conditions.The strain energy released in the rock volume plays a pivotal role in generating this abrupt structural failure in the rocks.In this paper,we propose criteria governing（1） the deterioration of rock strength based on energy dissipation and（2） the abrupt structural failure of rocks based on energy release.The critical stresses at the time of abrupt structural failure under various stress states can be determined by these criteria.As an example,the criteria have been used to analyze the failure conditions of surrounding rock of a circular tunnel.

关键词： energy dissipation energy release strength deterioration structural failure breakage size

活塞内冷油腔中纳米流体振荡流动与传热特性影响因素研究

在线全文

学校读者我要写书评

暂无评论

内燃机工程 2022年第3期43卷 1-10页

作者：肖杰邓晰文谢光义王金昆雷基林朱蕊东昆明理工大学云南省内燃机重点实验室昆明650500 昆明云内动力股份有限公司云南省内燃机高原排放重点实验室昆明650200

采用计算流体力学的方法,研究了分别含Al_(2)O_(3)、CuO、SiO_(2)的3种纳米机油在纳米颗粒体积分数为1%、3%、5%时相对于传统机油的振荡传热能力和机油在油腔内流动的规律。结果表明,纳米颗粒的加入改变了流体的物性参数,纳米流体的传... 详细信息

采用计算流体力学的方法,研究了分别含Al_(2)O_(3)、CuO、SiO_(2)的3种纳米机油在纳米颗粒体积分数为1%、3%、5%时相对于传统机油的振荡传热能力和机油在油腔内流动的规律。结果表明,纳米颗粒的加入改变了流体的物性参数,纳米流体的传热效果比传统机油更好,且内冷油腔的传热系数随着纳米流体体积分数的增加而增加,但对内冷油腔内瞬态机油的瞬态分布和充油率的影响不大;纳米流体的黏度、密度、导热系数、比热容都能影响内冷油腔的传热性能,密度的增加会使流体对壁面的冲击作用更强,从而增强油腔的传热能力;在纳米颗粒体积分数为5%时CuO纳米机油的传热系数比Al_(2)O_(3)、SiO_(2)纳米机油分别高8.2%和14.6%。

关键词：活塞内冷油腔纳米流体振荡传热传热系数

在线全文

学校读者我要写书评

暂无评论

砂岩拉伸过程中的能量耗散与损伤演化分析

岩石力学与工程学报 2007年第12期26卷 2526-2531页

作者：彭瑞东谢和平鞠杨中国矿业大学煤炭资源与安全开采国家重点实验室北京100083

岩石作为一种非均质的复杂地质材料,其力学响应表现出明显的非线性和各向异性特点。借助先进的试验测试系统,可以对岩石进行直接拉伸试验,从而在现有大量压缩试验的基础上进一步完善对岩石基本力学行为的研究。通过砂岩的循环拉伸试验... 详细信息

岩石作为一种非均质的复杂地质材料,其力学响应表现出明显的非线性和各向异性特点。借助先进的试验测试系统,可以对岩石进行直接拉伸试验,从而在现有大量压缩试验的基础上进一步完善对岩石基本力学行为的研究。通过砂岩的循环拉伸试验研究发现,拉伸过程中外载所做的总功除了引起岩石弹性变形能的增大外,还有一部分被耗散掉从而导致岩石发生不可逆的损伤。在对能量耗散进行分析的基础上,可以建立岩石的损伤演化方程,并通过试验测定相应的参数指标。试验研究和理论分析表明,基于能量耗散分析建立的岩石损伤演化方程可以较好地描述岩石的损伤演化过程。

关键词：岩石力学拉伸损伤能量耗散

Energy analysis for damage and catastrophic failure of rocks

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2011年第S1期54卷 199-209页

作者： xie HePing 1,2,LI LiYun 2,1,JU Yang 2,PENG ruidong 2 & YANG YongMing 2 1 Sichuan University,Chengdu 610065,China 2 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rock and Concrete,China University of Mining and Technology,Beijing 100083,China Sichuan University Chengdu China State Key Laboratory of Coal Resources and Safe Mining Beijing Key Laboratory of Fracture and Damage Mechanics of Rock and Concrete China University of Mining and Technology Beijing China

The development history and current state of studies on the characteristics and mechanisms of deformation and failure of rock materials were briefly reviewed from the viewpoint of energy.The main scope and the achievable objectives of the energy-based research system were expatiated.It was validated by experiments that the damage process of rocks can be well described by the rock damage evolution equation established based on energy dissipation.It was found from the uniaxial compression and biaxial compression tests that only a small proportion of the total input energy in hard rocks is dissipated before peak load and a large proportion in soft rocks is dissipated before peak load.For both hard and soft rocks,the energy dissipated after peak load accounts for a greater proportion.More energy would be required for rock failure under equal biaxial compression than under unequal biaxial compression.The total absorbed energy is different for rock failure under high-rate loading and low-rate loading.More fragmented failure pattern usually corresponds to higher energy absorption.The mesoscopic analysis on the damage and failure of bedded salt rocks showed that the energy dissipation is prominent and the total absorbed energy for rock failure is low when cracks propagate in the weak mud interlayer while it is contrary when cracks propagate in the salt rock.The energy accumulation,transfer,dissipation and release during the failure process of tunnel with impending failure under disturbance were analyzed theoretically based on the elastoplastic mechanics theory.Furthermore,the spatial distribution of energy dissipation and energy release of fractured rocks under unloading was simulated numerically.It was demonstrated that energy is likely to be released from the weakest surface under compression,which triggers the global failure of rocks.

关键词： rock deformation failure energy accumulation energy dissipation energy release