检索结果-南通市图书馆

Parameters optimization design of quenching and partitioning for best combination between strength and ductility using orthogonal experimental design

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2019年第10期26卷 1088-1095页

作者： Ming-qing Liao zhong-hong lai Aorigele Bao Yong Liu Dan-ni Yang Tian-yi Han Jing-chuan Zhu Rong-da Zhao School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina The Center of Analysis Measurement Harbin Institute of TechnologyHarbin 150001HeilongjiangChina National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Materi

Quenching and partitioning(Q&P)which provides a balance between toughness and strength is a promising heat treatment in iron and steel ***,there are three parameters(quenching temperature,partitioning temperature and partitioning time)which affect the properties *** a result,it remains a challenge to get the best parameters in a low-cost way for Q&P ***,the orthogonal experimental design combined with a local optimization was adopted to optimize the quenching and partitioning parameters of 65Si2MnWA *** using this method,the combination between strength and ductility was optimized;meanwhile,the number of experiments was reduced *** treated by quenching at 180℃followed by partitioning at 330℃for 20 min,the steel reached the best combination between strength and *** detail,the product of ultimate tensile strength and reduction in area was 1.36 times(from 64.9 to 88.8 GPa%)that treated by quenching and *** addition,owing to the grain refinement,the strength and ductility increase ***,the reduction in area increased by 27.4%(from 35.8%to 45.6%)coupled with a little improvement in ultimate tensile strength(7.4%).

关键词： Parameter optimization design Quenching and partitioning Orthogonal experimental design Mechanical property 65Si2MnWA steel

A357铝合金大型复杂薄壁构件的淬火温度场、残余应力及变形的有限元分析(英文)

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

中国有色金属学会会刊：英文版 2013年第6期23卷 1751-1760页

作者：杨夏炜朱景川来忠红刘勇何东农智升哈尔滨工业大学金属精密热加工国家级重点实验室哈尔滨150001 哈尔滨工业大学材料科学与工程学院哈尔滨150001

基于ABAQUS软件,采用有限元模拟计算的方法对A357铝合金大型复杂薄壁构件的淬火过程进行研究。通过采用传统的反传热方法,对不同淬火介质在不同温度下的换热系数进行精确求解。精确的换热系数确保对A357铝合金大型复杂薄壁构件淬火过程... 详细信息

基于ABAQUS软件,采用有限元模拟计算的方法对A357铝合金大型复杂薄壁构件的淬火过程进行研究。通过采用传统的反传热方法,对不同淬火介质在不同温度下的换热系数进行精确求解。精确的换热系数确保对A357铝合金大型复杂薄壁构件淬火过程中温度场预测的准确性。采用3种淬火介质(水、机油,5%-UCON淬火试剂A)。通过综合考虑淬火介质及温度因素,对薄壁构件的残余应力及变形的分布和大小进行有限元预测,得到构件淬火结束后的最大残余应力及变形。

关键词： A357铝合金复杂薄壁构件有限元模拟残余应力变形

Residual elastic stress strain field and geometrically necessary dislocation density distribution around nano-indentation in TA15 titanium alloy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2013年第1期23卷 7-13页

作者：何东朱景川来忠红刘勇杨夏炜农智升哈尔滨工业大学材料科学与工程学院哈尔滨150001

Nanoindentation and high resolution electron backscatter diffraction（EBSD） were combined to examine the elastic modulus and hardness of α and β phases,anisotropy in residual elastic stress strain fields and distributions of geometrically necessary dislocation（GND） density around the indentations within TA15 titanium *** nano-indention tests were conducted on α and β phases,*** residual stress strain fields surrounding the indentation were calculated through crosscorrelation method from recorded *** GND density distribution around the indentation was calculated based on the strain gradient theories to reveal the micro-mechanism of plastic *** results indicate that the elastic modulus and hardness for α p hase are 129.05 GPas and 6.44 GPa,while for β phase,their values are 109.80 GPa and 4.29 GPa,*** residual Mises stress distribution around the indentation is relatively heterogeneous and significantly influenced by neighboring soft β *** region with low residual stress around the indentation is accompanied with markedly high a type and prismatic-GND density.

关键词： nano-hardness stress strain fields geometrically necessary dislocation nanoindentation electron backscatter diffraction TA15 titanium alloy

Optimum design of flow distribution in quenching tank for heat treatment of A357 aluminum alloy large complicated thin-wall workpieces by CFD simulation and ANN approach

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2013年第5期23卷 1442-1451页

作者：杨夏炜朱景川何东来忠红农智升刘勇哈尔滨工业大学金属精密热加工国家级重点实验室哈尔滨150001 哈尔滨工业大学材料科学与工程学院哈尔滨150001

Based on the computational fluid dynamics （CFD） method, a quenching tank with two agitator systems and two flow-equilibrating devices was selected to simulate flow distribution using Fluent software. A numerical example was used to testify the validity of the quenching tank model. In order to take tank parameters （agitation speed, position of directional flow baffle and coordinate position in quench zone） into account, an approach that combines the artificial neural network （ANN） with CFD method was developed to study the flow distribution in the quenching tank. The flow rate of the quenching medium shows a very good agreement between the ANN predicted results and the Fluent simulated data. Methods for the optimal design of the quenching tank can be used as technical support for industrial production.

关键词： A357 aluminum alloy computational fluid dynamics quenching tank flow distribution artificial neural network

Cauda equina syndrome with urinary retention as a postoperative complication of lumbar spine surgery:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第10期13卷 40-45页

作者： Kai-Wu Yang Wei-hong lai Da-Wei Huang Department of Urology Chiayi Christian HospitalChiayi 600566Taiwan Department of Neurosurgery Chiayi Christian HospitalChiayi 600566Taiwan

BACKGROUND Cauda equina syndrome(CES)is characterized by a group of symptoms that may be caused by inflammation,spinal cord compression,venous congestion,or *** syndrome is commonly an indication for surgical intervention but has not been determined as a postoperative complication following surgery for lumbar spine *** SUMMARY To report the case of a 54-year-old male patient who had CES following spinal surgery,with no obvious compression lesions found during re-exploration,suggesting that vascular insufficiency may have contributed to the ***,a series of urodynamic studies on bladder recovery patterns in such complications have also been *** Postoperative CES requires urgent imaging and exploration to rule out compression;noncompressive cases,including vascular insufficiency may performed conservative management.

关键词： Cauda equina syndrome Lumbar spine surgery Urinary retention Urodynamic study Postoperative complication Case report

Prediction of mechanical properties of A357 alloy using artificial neural network

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

Transactions of Nonferrous Metals Society of China 2013年第3期23卷 788-795页

作者：杨夏炜朱景川农智升何东来忠红刘颖刘法伟哈尔滨工业大学金属精密热加工国家级重点实验室哈尔滨150001 哈尔滨工业大学材料科学与工程学院哈尔滨150001 北京航星机器制造公司北京100013 沈阳飞机工业(集团)有限公司理化测试中心沈阳110034

The workpieces of A357 alloy were routinely heat treated to the T6 state in order to gain an adequate mechanical *** mechanical properties of these workpieces depend mainly on solid-solution temperature,solid-solution time,artificial aging temperature and artificial aging *** artificial neural network（ANN） model with a back-propagation（BP） algorithm was used to predict mechanical properties of A357 alloy,and the effects of heat treatment processes on mechanical behavior of this alloy were *** results show that this BP model is able to predict the mechanical properties with a high *** model was used to reflect the influence of heat treatments on the mechanical properties of A357 *** of ultimate tensile strength and elongation were drawn in the same picture,which are very helpful to understand the relationship among aging parameters,ultimate tensile strength and elongation.

关键词： A357 alloy mechanical properties artificial neural network heat treatment parameters

Pathogenesis, diagnosis, and treatment of epilepsy: electromagnetic stimulation-mediated neuromodulation therapy and new technologies

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 917-935页

作者： Dian Jiao lai Xu Zhen Gu Hua Yan Dingding Shen Xiaosong Gu Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjinChina Key Laboratory of Advanced Drug Delivery Systems of Zhejiang Province College of Pharmaceutical SciencesZhejiang UniversityHangzhouZhejiang ProvinceChina Affiliated Hospital of Nantong University NantongJiangsu ProvinceChina

Epilepsy is a severe,relapsing,and multifactorial neurological *** regarding the accurate diagnosis,prognosis,and in-depth pathogenesis are crucial for the precise and effective treatment of *** pathogenesis of epilepsy is complex and involves alterations in variables such as gene expression,protein expression,ion channel activity,energy metabolites,and gut microbiota *** results are lacking for conventional treatments for *** resection of lesions,drug therapy,and non-drug interventions are mainly used in clinical practice to treat pain associated with ***-pharmacological treatments,such as a ketogenic diet,gene therapy for nerve regeneration,and neural regulation,are currently areas of research *** review provides a comprehensive overview of the pathogenesis,diagnostic methods,and treatments of *** also elaborates on the theoretical basis,treatment modes,and effects of invasive nerve stimulation in neurotherapy,including percutaneous vagus nerve stimulation,deep brain electrical stimulation,repetitive nerve electrical stimulation,in addition to non-invasive transcranial magnetic stimulation and transcranial direct current *** studies have shown that electromagnetic stimulation-mediated neuromodulation therapy can markedly improve neurological function and reduce the frequency of epileptic ***,many new technologies for the diagnosis and treatment of epilepsy are being ***,current research is mainly focused on analyzing patients’clinical manifestations and exploring relevant diagnostic and treatment methods to study the pathogenesis at a molecular level,which has led to a lack of consensus regarding the mechanisms related to the disease.

关键词： diagnosis drug treatment electroencephalography epilepsy monitoring epilepsy nerve regeneration neurostimulation non-drug interventions pathogenesis prediction

Microstructure Characterization and Fracture Toughness of Laves Phase-Based Cr–Nb–Ti Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第4期28卷 514-520页

作者： Yun-Long Xue Shuang-Ming Li hong zhong lai-Ping Li Heng-Zhi Fu State Key Laboratory of Solidification Processing Northwestern Polytechnical University Northwest Institute for Non-Ferrous Metal Research

Three Laves phase-based alloys with nominal compositions of Cr2Nb-xTi （x = 20, 30, 40, in at%） have been prepared through vacuum non-consumable arc melting. The results show that the microstructures of Cr2Nb-（20, 30） Ti alloys are composed of the primary Laves phase C15-Cr2（Nb,Ti） and bcc solid solution phase, while the microstructure of Cr2Nb-40Ti alloy is developed with the eutectic phases C15-Cr2（Nb,Ti）/bcc solid solution. The measured fracture toughness of ternary Laves phase C15-Cr2（Nb,Ti） is about 3.0 MPa m1/2, much larger than 1.4 MPa m1/2 for binary Laves phase Cr2Nb. Meanwhile, the fracture toughness of Cr2Nb-xTi （x = 20, 30, 40） alloys increases with increasing Ti content and reaches 10.6 MPa m1/2 in Cr2Nb-40Ti alloy. The eutectic microstructure and addition of Ti in Cr2Nb are found to be effective in toughening Laves phase-based alloys.

关键词： Laves phase-based alloys Microstructure characterization Fracture toughness Crackpropagation Fracture

Meningeal lymphatic vessel crosstalk with central nervous system immune cells in aging and neurodegenerative diseases

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 763-778页

作者： Minghuang Gao Xinyue Wang Shijie Su Weicheng Feng Yaona lai Kongli Huang Dandan Cao Qi Wang Science and Technology Innovation Center Guangzhou University of Chinese MedicineGuangzhouGuangdong ProvinceChina Institute of Clinical Pharmacology Guangzhou University of Chinese MedicineGuangzhouGuangdong ProvinceChina The Sixth Affiliated Hospital Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina

Meningeal lymphatic vessels form a relationship between the nervous system and periphery, which is relevant in both health and disease. Meningeal lymphatic vessels not only play a key role in the drainage of brain metabolites but also contribute to antigen delivery and immune cell activation. The advent of novel genomic technologies has enabled rapid progress in the characterization of myeloid and lymphoid cells and their interactions with meningeal lymphatic vessels within the central nervous system. In this review, we provide an overview of the multifaceted roles of meningeal lymphatic vessels within the context of the central nervous system immune network, highlighting recent discoveries on the immunological niche provided by meningeal lymphatic vessels. Furthermore, we delve into the mechanisms of crosstalk between meningeal lymphatic vessels and immune cells in the central nervous system under both homeostatic conditions and neurodegenerative diseases, discussing how these interactions shape the pathological outcomes. Regulation of meningeal lymphatic vessel function and structure can influence lymphatic drainage, cerebrospinal fluid-borne immune modulators, and immune cell populations in aging and neurodegenerative disorders, thereby playing a key role in shaping meningeal and brain parenchyma immunity.

关键词： central nervous system meningeal lymphatic vessels immunity myeloid cells lymphatic cells neurodegenerative disease