检索结果-南通市图书馆

Laser Wire Additive Manufacturing of Ti-6Al-4V Alloy and Its Machine Learning Study for Parameters Optimization(Invited)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国激光 2024年第4期51卷 182-198页

作者： Wu Junyi Zhang Bo wang Weihua Li Weipeng Yao Xiyu wang dawei Xing Wei Yan Ming Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina Songshan Lake Materials Laboratory Dongguan 523830GuangdongChina Institute of Physics Chinese Academy of SciencesBeijing 100190China Jiaxing Research Institute Southern University of Science and TechnologyShenzhen 518055GuangdongChina High Performance Computing Department National Supercomputing CenterShenzhen 518055GuangdongChina

Ti-6Al-4V is a benchmark Ti alloy. Laser wire additive manufacturing(LWAM) offers advanced manufacturing capability to the alloy for applications possibly including exploration of outer space. As a typical multiple-variable process, LWAM is complex, which, however, can be analyzed, predicated or even optimized by artificial intelligence(AI) methods such as machine learning(ML). In this study, printing parameters of the Ti-6Al-4V is firstly optimized using single-track-single-layer experiments, and then single-track-multiple-layer samples are printed, whose properties in terms of hardness and compressive strength are analyzed subsequently by both experiments and ML. The two ML approaches, artificial neural network(ANN) and support vector machine(SVM), are employed to predict the experimental results, whose coefficients of determination R2 show good values. Further optimized properties are realized by adopting genetic algorithm(GA) and simulated annealing(SA) approaches, which contribute to high mechanical properties achieved, for instance, an engineering compressive strength of about 1694 MPa. The results here indicate that important mechanical properties of the LWAM-prepared Ti alloys can be well predicted and enhanced using suitable ML approaches.

关键词： artificial printing additive

Properties of Self-recoverable Mechanoluminescence Phosphor Ca_(5)Ga_(6)O_(14)∶Eu^(3+)and Its Information Encryption Application

在线全文

学校读者我要写书评

暂无评论

发光学报 2024年第9期45卷 1445-1455页

作者： ZHANG Ting wang Zhijun wang dawei ZHAO Jinxin YANG Zhiping LI Panlai Hebei Key Laboratory of Optic-electronic Information and Materials College of Physics Science&TechnologyHebei UniversityBaoding 071002China Hebei Key Laboratory of Semiconductor Lighting and Display Critical Materials Hebei Ledphor Optoelectronics Technology Co.LTD.Baoding 071000China

A novel self-recoverable mechanoluminescent phosphor Ca_(5)Ga_(6)O_(14)∶Eu^(3+)was developed by the high-tem-perature solid-state reaction method,and its luminescence properties were ***_(5)Ga_(6)O_(14)∶Eu^(3+)can produce red mechanoluminescence,and importantly,it shows good *** mechanoluminescence of Ca_(5)Ga_(6)O_(14)∶Eu^(3+)re-sults from the piezoelectric field generated inside the material under stress,rather than the charge carriers stored in the traps,which can be confirmed by the multiple cycles of mechanoluminescence tests and heat treatment *** mechanoluminescence color can be turned from red to green by co-doping varied concentrations of Tb^(3+),which may be meaningful for encrypted letter *** encryption scheme for secure communication was devised by harness-ing mechanoluminescence patterns in diverse shapes and ASCII codes,which shows good encryption *** results suggest that the mechanoluminescence phosphor Ca_(5)Ga_(6)O_(14)∶Eu^(3+),Tb^(3+)may be applied to the optical infor-mation encryption.

关键词： phosphor mechanoluminescence self-recoverable information encryption

High Areal Capacity and Long Cycle Life Flexible Mild Quasi-Solid-State Ag-Zn Battery with Dendrite-Free Anode

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

Energy & Environmental Materials 2024年第1期7卷 38-45页

作者： Yanzhe Zhu Renbo Zhu Fandi Chen Shuo Zhang Yu-Chieh Kuo Peiyuan Guan Mengyao Li Yunjian Liu Zhaojun Han Tao Wan dawei wang Caiyun wang Dewei Chu School of Materials Science and Engineering The University of New South Wales School of Material science and Engineering Jiangsu University School of Chemical Engineering The University of New South Wales Intelligent Polymer Research Institute AIIM Innovation Campus University of Wollongong

Silver-zinc(Ag-Zn) batteries are a promising battery system for flexible electronics owing to their high safety,high energy density,and stable output ***,poor cycling performance,low areal capacity,and inferior flexib... 详细信息

关键词： binder-free electrodes dendrite-free flexible Ag–Zn battery mild electrolyte quasi-solid-state

以医为业,以僧为生:宋元时期涉医僧人的社会活动

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

宗教学研究 2024年第2期 90-105页

作者：王大伟四川大学道教与宗教文化研究所四川大学佛教与社会研究所

宋元时期有非常多的涉医僧人活跃在社会的各个层面,他们行医时接触的阶层范围极广,是一个特殊又活跃的群体。围绕这个群体,不仅有医术的流传,还有政治、慈善、神异等多种类型事件或故事发生。这些僧人实际形成了以医为业,以僧为生的生... 详细信息

宋元时期有非常多的涉医僧人活跃在社会的各个层面,他们行医时接触的阶层范围极广,是一个特殊又活跃的群体。围绕这个群体,不仅有医术的流传,还有政治、慈善、神异等多种类型事件或故事发生。这些僧人实际形成了以医为业,以僧为生的生活样态。围绕着他们的故事,我们可以进一步发现宋元社会中,除了普通医生群体以外的医僧群体,他们的人生、生活、技术构成了一个有趣又鲜活的宋元时期僧众生活图景。

关键词：宋元时期涉医僧人社会活动

Selection of Suitable Area and Analysis of Adaptability Difference of Prunus humilis

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2024年第3期16卷 41-45页

作者： Ze YAO Shengxiu JIANG Zizhu YAN Qi wang dawei wang Gansu Desert Control Research Institute Lanzhou 730700China Gansu Psammophytes Engineering Technology Research Center Lanzhou 730700China State Key Laboratory of Desertification and Aeolian Sand Disaster Combating Lanzhou 730700China

This paper delves into and assesses the differences in biological traits and fruit nutritional composition of 3 varieties of Prunus humilis introduced from 2 different *** showed that(i)the contents of protein,total sugar,and calcium of No.5 variety were higher those of the other 2 varieties,which was recognized as the most suitable variety for fresh fruit;(ii)the comparison of leaf areas index and fruit shape index of 3 varieties shows that the fruit shape index and individual fruit weight of the introduced varieties were higher than those of the control,the diameter of individual fruit of the introduced varieties higher than that of the control indicated that they had a higher fruit hardness,more dry matter accumulation and better fruit quality,and that the introduction region was more suitable for scale-up of ***;(iii)there was a positive correlation with the number of fruiting branches and there was a significant negative correlation with individual fruit weight,while the leaf area had a significant negative correlation with the number of fruiting *** introduced varieties can develop normally in the 2 testing areas,notably,No.5 variety performed better than No.4 and *** management is the prerequisite for maintaining proper number of fruiting branches and high yield.

关键词： Prunus humilis Biological traits Nutritional components Introduction and cultivation

Research Progress of QuEChERS Pretreatment Technique in the Detection of Multiple Pesticide Residues

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

Agricultural Biotechnology 2024年第2期13卷 10-11,37页

作者： Bo LIU dawei wang Yuhang GUO Xuehua wang Lei wang Yajuan SONG Tangshan Food and Drug Comprehensive Testing Center Tangshan 063000China Hebei Agricultural Products Quality and Safety Testing Innovation Center Tangshan 063000China

The QuEChERS extraction technique is a pretreatment technique that has been rapidly applied in recent years and is widely used in the field of pesticide residues with many advantages. This technique is based on solid phase extraction (SPE), which uses the interaction between adsorbent and impurities in the matrix to achieve the purpose of purification. The method has easier operation and better purification effect than SPE. In this paper, the research progress of the QuEChERS technique in pesticide residue detection in different fields in recent years and its future development were reviewed, hoping to provide reference for further development and utilization of the QuEChERS technique in pesticide residue detection in the future.

关键词： QuEChERS Pretreatment Pesticide residues Research progress

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

电介质储能陶瓷薄膜研究进展及改性方法

硅酸盐学报 2024年第4期52卷 1413-1437页

作者：岳文锋颜廷楠王大伟哈尔滨工业大学仪器科学与工程学院哈尔滨150001 顺络电子股份有限公司研发部广东深圳518110

电介质陶瓷薄膜材料制备的储能电容器,具有充放电速率快、功率密度大以及良好的温度稳定性和循环稳定性等优势,在脉冲激光武器、心脏起搏器等军事、民用领域具有广阔的应用前景。然而,电介质电容器的储能密度相对较低,限制了其应用范围... 详细信息

电介质陶瓷薄膜材料制备的储能电容器,具有充放电速率快、功率密度大以及良好的温度稳定性和循环稳定性等优势,在脉冲激光武器、心脏起搏器等军事、民用领域具有广阔的应用前景。然而,电介质电容器的储能密度相对较低,限制了其应用范围,因此如何提高其储能密度成为当前研究的重点之一。此外,电介质储能陶瓷薄膜材料种类繁多、制备工艺复杂,因此选择合适的材料体系和制备工艺至关重要。本文总结了电介质储能陶瓷薄膜材料的研究进展,重点讨论了6种类型的材料,包括线性电介质、顺电材料、铁电材料、弛豫铁电材料、超顺电材料和反铁电材料。此外,进一步总结了目前常用的提升电介质储能陶瓷薄膜材料储能性能的方法。期望本文的研究成果能够对开发新一代高性能电介质储能陶瓷薄膜提供有价值的参考。

关键词：陶瓷薄膜电介质电容器储能性能

循环冲击下大理岩的损伤力学行为及能量耗散特性

在线全文

学校读者我要写书评

暂无评论

爆炸与冲击 2024年第4期44卷 47-59页

作者：王志亮汪大为汪书敏巫绪涛合肥工业大学土木与水利工程学院安徽合肥230009

为了研究循环冲击荷载作用下大理岩的动态力学行为和能量耗散特性,首先采用分离式霍普金森压杆,通过试冲法确定出5种代表性的入射子弹速度,据此完成了大理岩试样的等幅循环冲击试验,并对试样的应力均匀性进行了检验。接着,从应变率时程... 详细信息

为了研究循环冲击荷载作用下大理岩的动态力学行为和能量耗散特性,首先采用分离式霍普金森压杆,通过试冲法确定出5种代表性的入射子弹速度,据此完成了大理岩试样的等幅循环冲击试验,并对试样的应力均匀性进行了检验。接着,从应变率时程曲线、应力-应变关系、冲击次数和能量耗散特性等方面对测试数据进行了系统分析。最后,基于能量演化定义损伤变量,探讨了能量耗散与岩样损伤发展之间的关联机制。结果表明:试样应变率时程曲线在低弹速下会出现变化率恒定的平台段,应力-应变曲线在峰后阶段均产生一定的回弹;随着循环次数的增加,试样峰值应力总体减小,而峰值应变、平均应变率和累积比能量吸收值则变化趋势相反,且在临近破坏或开裂前其变化速率呈现突增现象;峰值应力与平均应变率存在明显的线性关系,弹性模量随平均应变率的变化整体上符合指数衰减规律;试样的耗散比能与平均应变率之间呈线性正相关,基于能量耗散定义的损伤变量可以较好地表征该大理岩试样动载下的损伤破坏过程。

关键词：大理岩循环冲击动力学特性能量耗散损伤演化

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

废旧GFRP回收及其增强沥青性能

北京工业大学学报 2024年第4期50卷 443-452页

作者：余森开林娇王大为中铁十六局集团路桥工程有限公司北京101500 哈尔滨工业大学交通科学与工程学院哈尔滨150090

玻璃纤维增强复合材料(glass fiber reinforced polymer,GFRP)因其优异的力学性能和耐腐蚀性而广泛应用于航空、船舶和风力发电等领域。GFRP的广泛使用导致大量废弃物的产生,对环境造成了巨大的危害,因此废旧GFRP的回收处理问题备受关... 详细信息

玻璃纤维增强复合材料(glass fiber reinforced polymer,GFRP)因其优异的力学性能和耐腐蚀性而广泛应用于航空、船舶和风力发电等领域。GFRP的广泛使用导致大量废弃物的产生,对环境造成了巨大的危害,因此废旧GFRP的回收处理问题备受关注。将废旧环氧基GFRP和聚氨酯基GFRP破碎粉末(直径<0.075 mm)作为沥青增强材料,研究了其对沥青基本性能的影响,并对比了硅烷偶联剂对增强作用的影响。结果表明,2种GFRP粉末对沥青的增强作用并不明显,而使用硅烷偶联剂对GFRP粉末进行表面处理后,能够显著改善GFRP粉末与沥青间相互作用,并提高沥青的流变性能和表面自由能,降低玻璃化转变温度,其中硅烷偶联剂对环氧基GFRP的改善效果优于聚氨酯基GFRP。该文为废弃GFRP提供了一种相对有效且环保的物理回收方法,并为纤维增强复合材料(fiber reinforced polymer,FRP)的回收利用提供了新思路。

关键词：玻璃纤维增强复合材料(GFRP) 固体废弃物回收利用沥青增强作用,表面处理