检索结果-南通市图书馆

China Foundry 2024年第1期21卷 29-43页

作者： Zhao-yang yin Qi-chi Le Yan-chao Jiang Da-zhi Zhao Qi-yu Liao Qi Zou Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

A transient 3D model was established to investigate the effect of spatial interaction of ultrasounds on the dual-frequency ultrasonic field in magnesium alloy *** effects of insertion depth and tip shape of the ultrasonic rods,input pressures and their ratio on the acoustic field distribution were discussed in ***,the spacing,angle,and insertion depth of two ultrasonic rods significantly affect the interaction between distinct *** a result,various acoustic pressure distributions and cavitation regions are *** spherical rods mitigate the longitudinal and transversal attenuation of acoustic pressure and expand the cavitation volume by 53.7%and 31.7%,respectively,compared to the plate and conical *** the input pressure will enlarge the cavitation region but has no effect on the acoustic pressure distribution *** acoustic pressure ratio significantly affects the pressure distribution and the cavitation region,and the best cavitation effect is obtained at the ratio of 2:1(P15:P20).

关键词： dual-frequency ultrasonic numerical model acoustic pressure spatial interaction magnesium alloy

Effect of Artificial Cooling Extrusion on Microstructure and Mechanical Properties of Mg–Zn–Y Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1115-1127页

作者： Qi-Yu Liao Da-Zhi Zhao Qi-Chi Le Wen-Xin Hu Yan-Chao Jiang Wei-yang Zhou Liang Ren Dan-Dan Li Zhao-yang yin School of Materials Science and Engineering Northeastern UniversityShenyang110819China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Lightweight Structural Materials Liaoning ProvinceNortheastern UniversityShenyang110819China Baotou Research Institute of Rare Earths Baotou014000China

Microstructure and mechanical properties of Mg–Zn–Y alloys with different Zn/Y atomic ratios with or without artificial cooling (AC) extrusion were systematically investigated in this work. The results show that bimodal microstructure consisting of submicron dynamic recrystallized (DRXed) grains with high fraction of low-angle grain boundaries (LAGBs) and elongated unDRXed grains was formed in Mg_(98.7)Zn_(1)Y_(0.3) alloy with AC extrusion. The AC process effectively limits the growth of precipitated phases, and large amount of nanoscale precipitates were dynamically precipitated during the extrusion process. AC extrusion could effectually refine the lamellar 14H LPSO phases and inhibit the transition from stacking faults to LSPO phases in Mg_(98)Zn_(1)Y_(1) alloy and the narrow LPSO phase in Mg_(98)Zn_(1)Y_(1)-AC alloy which could promote the nucleation of DRXed grains. The AC extrusion significantly improves the strength of Mg–Zn–Y alloys. Owing to AC extrusion, the strength improvement of Mg_(98.7)Zn_(1)Y_(0.3) alloy is mainly attributed to fine grain strengthening, dislocation strengthening, and nano-phases precipitation strengthening. After AC process, more fine grains and nano-phases jointly strengthen the Mg_(98)Zn_(1)Y_(1) alloy. The Mg_(98)Zn_(1)Y_(1) alloy obtains optimal mechanical properties after extrusion at 623 K, with ultimate tensile strength (UTS) of 406 MPa, yield strength (YS) of 388 MPa, and elongation (EL) of 5.6%.

关键词： Mg-Zn-Y Artificial cooling Extrusion Microstructure Mechanical properties

Morphological disruption and visual tuning alterations in the primary visual cortex in glaucoma(DBA/2J)mice

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

Neural Regeneration Research 2024年第1期19卷 220-225页

作者： yin yang Zhaoxi yang Maoxia Lv Ang Jia Junjun Li Baitao Liao Jing’an Chen Zhengzheng Wu Yi Shi yang Xia Dezhong Yao Ke Chen Department of Ophthalmology Sichuan Provincial People’s HospitalMedical SchoolUniversity of Electronic Science and Technology of ChinaChengduSichuan ProvinceChina The Clinical Hospital of Chengdu Brain Science Institute MOE Key Lab for NeuroInformationSchool of Life Science and TechnologyUniversity of Electronic Science and Technology of ChinaChengduSichuan ProvinceChina Research Unit of NeuroInformation Chinese Academy of Medical SciencesChengduSichuan ProvinceChina Institute of Basic Medical Sciences Chinese Academy of Medical Sciences School of Basic Medicine Peking Union Medical CollegeBeijingChina Health Management Center Sichuan Provincial Key Laboratory for Human Disease Gene StudySichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengduSichuan ProvinceChina Research Unit for Blindness Prevention of Chinese Academy of Medical Sciences(2019RU026) Sichuan Academy of Medical SciencesChengduSichuan ProvinceChina School of Electrical Engineering Zhengzhou UniversityZhengzhouHenan ProvinceChina

Glaucoma is a leading cause of irreve rsible blindness wo rldwide,and previous studies have shown that,in addition to affecting the eyes,it also causes abnormalities in the ***,it is not yet clear how the primary visual cortex(V1)is altered in *** study used DBA/2J mice as a model for spontaneous secondary *** aim of the study was to compare the electrophysiological and histomorphological chara cteristics of neurons in the V1between 9-month-old DBA/2J mice and age-matched C57BL/6J *** conducted single-unit recordings in the V1 of light-anesthetized mice to measure the visually induced responses,including single-unit spiking and gamma band *** morphology of layerⅡ/Ⅲneurons was determined by neuronal nuclear antigen staining and Nissl staining of brain tissue ***-seven neurons from eight DBA/2J mice and eighty-one neurons from eight C57BL/6J mice were *** with the C57BL/6J group,V1 neurons in the DBA/2J group exhibited weaker visual tuning and impaired spatial *** r,fewer neuro ns were observed in the V1 of DBA/2J mice compared with C57BL/6J *** findings suggest that DBA/2J mice have fewer neurons in the VI compared with C57BL/6J mice,and that these neurons have impaired visual *** findings provide a better understanding of the pathological changes that occur in V1 neuron function and morphology in the DBA/2J mouse *** study might offer some innovative perspectives regarding the treatment of glaucoma.

关键词： DBA/2J degeneration gamma band oscillations glaucoma primary visual cortex(V1) retina single-unit recording tuning curve

XOR spin logic operated by unipolar current based on field-free spin-orbit torque switching induced by a lateral interface

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3868-3875页

作者： Yan-Ru Li Mei-yin yang Guo-Qiang Yu Bao-Shan Cui Jin-Biao Liu Yong-Liang Li Qi-Ming Shao Jun Luo Key Laboratory of Microelectronic Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of Sciences(IMECAS)Beijing 100029China University of Chinese Academy of Sciences(UCAS) Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education Lanzhou UniversityLanzhou 730000China Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China

Spin logics have emerged as a promising avenue for the development of logic-in-memory *** particular,the realization of XOR spin logic gates using a single spin-orbit torque device shows great potential for low-power stateful logic circuits in the next *** this study,we successfully obtained the XOR logic gate by utilizing a spin-orbit torque device with a lateral interface,which was created by local ion implantation in the Ta/Pt/Co/Ta Hall device exhibiting perpendicular magnetic *** angle of the lateral interface is set at 45°relative to the current direction,leading to the competition between symmetry breaking and current-driven Néel-type domain wall ***,the field-free magnetic switching reversed is realized by the same sign of current amplitude at this *** on this field-free magnetic switching behavior,we successfully proposed an XOR logic gate that could be implemented using only a single spin-orbit torque Hall *** study provides a potentially viable approach toward efficient spin logics and in-memory computing architectures.

关键词： Filed-free magnetic switching Spin-orbit torque XOR logic gate Lateral interface

Micelle-directed self-assembly of single-crystal-like mesoporous stoichiometric oxides for high-performance lithium storage

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第4期11卷 195-205页

作者： Yanhua Wan Changyao Wang Xingmiao Zhang yang yin Mengmeng Liu Bing Ma Linlin Duan Yuzhu Ma Wei Zhang Changlin Zheng Dongliang Chao Fei Wang Yongyao Xia Wei Li Department of Chemistry Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers College of Chemistry and Materials ScienceFudan University State Key Laboratory of Surface Physics and Department of Physics Fudan University

Due to their uncontrollable assembly and crystallization process,the synthesis of mesoporous metal oxide single crystals remains a formidable ***,we report the synthesis of single-crystal-like mesoporous Li2TiSiO5by using soft micelles as *** key lies in the atomic-scale self-assembly and step-crystallization processes,which ensure the formation of single-crystal-like mesoporous Li2TiSiO5microparticles via an oriented attachment growth mechanism under the confinement of an in-situ formed carbon *** mesoporous Li2TiSiO5anode achieves a superior rate capability(148 mAh g-1at5.0 A g-1) and outstanding long-term cycling stability(138 mAh g-1after 3000 cycles at 2.0 A g-1) for lithium storage as a result of the ultrafast Li+diffusion caused by penetrating mesochannels and nanosized crystal frameworks（5-10 nm）.In comparison,bulk Li2TiSiO5exhibits poor rate capability and cycle performance due to micron-scale diffusion *** method is very simple and reproducible,heralding a new way of designing and synthesizing mesoporous single crystals with controllable frameworks and chemical functionalities.

关键词： mesoporous materials micelles single-crystal-like Li2TiSiO5 lithium-ion batteries

S-doped mesoporous graphene modified separator for high performance lithium-sulfur batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Materials Reports(Energy) 2024年第3期4卷 60-68页

作者： Xinlong Ma Chenggen Xu yin yang Dong Sun Kai Zhao Changbo Lu Peng Jin Yiting Chong Sirawit Pruksawan Zhihua Xiao Fuke Wang State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijingChangping102249China State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization China Pingmei Shenma GroupPingdingshan 467000China Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WayInnovis#08-03138634Republic of Singapore

Due to their low cost,environmental friendliness and high energy density,the lithium-sulfur batteries(LSB)have been regarded as a promising alternative for the next generation of rechargeable battery ***,the practical application of LSB is seriously hampered by its short cycle life and high self-charge owing to the apparent shuttle effect of soluble lithium *** MgSO_(4)@MgO composite as both template and dopant,template-guided S-doped mesoporous graphene(SMG)is prepared via the fluidized-bed chemical vapor deposition *** the polypropylene(PP)modifier,SMG with high specific surface area,abundant mesoporous structures and moderate S doping content offers a wealth of physical and chemical adsorptive sites and reduced interfacial contact resistance,thereby restraining the serious shuttle effects of lithium ***,the LSB configured with mesoporous graphene(MG)as S host material and SMG as a separator modifier exhibits an enhanced electrochemical performance with a high average capacity of 955.64 mA h g^(-1) at 1C and a small capacity decay rate of 0.109%per ***,the density functional theory(DFT)calculation models have been rationally constructed and demonstrated that the doped S atoms in SMG possess higher binding energy to lithium polysulfides than that in MG,indicating that the SMG/PP separator can effectively capture soluble lithium polysulfides via chemical binding *** work would provide valuable insight into developing a versatile carbon-based separator modifier for LSB.

关键词： Fluidized-bed chemical vapor deposition Mesoporous graphene S doping Separator modification Lithium-sulfur battery

Quantitative analysis of the morphing wing mechanism of raptors: Analysis methods, folding motions, and bionic design of Falco Peregrinus

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

Fundamental Research 2024年第2期4卷 344-352页

作者： Di Tang Xipeng Huang Jinqi Che Weijie Jin Yahui Cui yangjun Chen Yuxiao Yuan Zhongyong Fan Weiwei Lu Siyu Wang yin yang Dawei Liu College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310014China Affiliated HangZhou XiXi hospital Zhejiang University School of MedicineHangzhou 310023China Zhejiang Museum of Natural History Hangzhou 310014China High Speed Aerodynamic Institute China Aerodynamics Research and Development CenterMianyang 621000China

Raptors can change the shape and area of their wings to an exceptional degree in a fast and efficient manner,surpassing other birds,insects,or *** researchers have focused on the functional properties of muscle skeletons,mechanics,and flapping robot ***,the wing motion of the birds of prey has not been measured quantitatively,and synthetic bionic wings with morphing abilities similar to raptors are far from ***,in the current study,a 3D suspension system for holding bird carcasses was designed and fabricated to fasten the wings of Falco Peregrinus with a series of morphing ***,the wing skeleton of the falcon was scanned during extending motions using the computed tomography(CT)approach to obtain three consecutive ***,the skeleton was reconstructed to identify the contribution of the forelimb bones to the extending/folding *** by these findings,we propose a simple mechanical model with four bones to form a wing-morphing mechanism using the proposed pose optimisation ***,a bionic wing mechanism was implemented to imitate the motion of the falcon wing—divided into inner and outer wings with folding and twisting *** results show that the proposed four-bar mechanism can track bone motion paths with high fidelity.

关键词： Falco Peregrinus Raptor Suspension system CT scan Bionic wings Four-bar mechanism

GC-MS结合电子鼻、电子舌分析6种糖炒燕山板栗的风味成分

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

食品工业科技 2024年第2期45卷 269-279页

作者：杨银梁建兰河北科技师范学院食品科技学院河北秦皇岛066600 板栗产业技术教育部工程研究中心河北秦皇岛066600 河北省板栗产业协同创新中心河北秦皇岛066600

为了研究6种糖炒燕山板栗香气的构成特点及品种间滋味和气味上的差异。以6种糖炒板栗为原料,采用顶空固相微萃取-气相色谱-质谱联用(Headspace solid phase microextraction-gas chromatography-mass spectrometry,HS-SPME-GC-MS)技术及气味活性值(Odor activity value,OAV)法分析6种糖炒板栗的挥发性风味成分和关键香气化合物,并结合电子鼻和电子舌对其挥发性气味成分和滋味进行分析。结果表明,通过GC-MS技术从6种糖炒板栗的挥发性成分中共检测出57种化合物,其中酯类19种,醇类12种,醛类5种,酮类5种,烯烃类4种,苯环类4种,胺类2种,其他类6种;其中23个OAV>1的成分被确定为糖炒板栗的关键香气成分。电子鼻评价结果显示6种糖炒板栗的主要挥发性气味成分为醇类、醛酮类、氮氧化合物、有机硫化物、无机硫化物以及甲基类几种。电子舌评价结果显示6种糖炒板栗在各项味觉指标上整体较为相似,其中丰富性和鲜味传感器对不同糖炒板栗的响应值最大,酸味和涩味最小,丰富性、鲜味、甜味、咸味、苦味、苦味回味6个指标为糖炒板栗的主要味觉指标。6种糖炒板栗的挥发性风味成分和含量都存在一定的差异,即不同品种糖炒板栗中的挥发性风味成分不同,且同种化合物在不同品种间的含量也有区别。通过主成分分析(Principal component analysis,PCA)、雷达色谱图分析、GC-MS技术结合电子鼻/电子舌可较好的区分不同品种糖炒板栗风味的差异,并确定其关键香气成分,为不同糖炒板栗的风味研究提供理论依据。

关键词：燕山板栗气相色谱-质谱联用电子鼻电子舌风味

维普期刊数据库博看期刊

人工智能时代的会计变革:演进逻辑与分析框架

在线全文

学校读者我要写书评

暂无评论

会计研究 2024年第3期 3-20页

作者：杨寅刘勤上海国家会计学院 201702

本文以人工智能为研究背景,基于会计信息系统论与会计管理活动论,结合TOE理论框架对会计变革的演进逻辑与分析框架进行研究,得出如下结论:第一,对会计而言,弱人工智能技术特征的影响具有普遍性,强人工智能技术特征影响程度相对较低;第二... 详细信息

本文以人工智能为研究背景,基于会计信息系统论与会计管理活动论,结合TOE理论框架对会计变革的演进逻辑与分析框架进行研究,得出如下结论:第一,对会计而言,弱人工智能技术特征的影响具有普遍性,强人工智能技术特征影响程度相对较低;第二,在人机协同和人机共生的技术模式下,会计人员和财务机器人会体现不同的职能和工作价值;第三,会计基本职能和会计扩展职能对人工智能的依赖程度存在差异,而会计转型职能的智能解决方案未能在本文案例中找到答案;第四,人工智能将为会计工作者、会计决策、会计学科属性、会计伦理、会计主体、会计内容等会计工作提供积极的变革动力。上述结论有助于深入分析影响会计工作的逻辑框架,为应对会计职能转变提供决策依据。

关键词：人工智能时代会计变革会计职能会计工作

善意性别偏见经历量表在中国女大学生中的信效度检验

在线全文

学校读者我要写书评

暂无评论

中国临床心理学杂志 2024年第1期32卷 107-111页

作者：杨泽垠胡月大连理工大学马克思主义学院大连116024 大连理工大学心理健康教育与咨询中心大连116024

目的:检验善意性别偏见经历量表(experiences with benevolent sexism scale,EBSS)在中国女大学生中的信度和效度。方法:使用中文版善意性别偏见经历量表对828名女大学生进行测量,以性别偏见事件量表(SSE)、善意性别偏见量表(BSI)、自... 详细信息

目的:检验善意性别偏见经历量表(experiences with benevolent sexism scale,EBSS)在中国女大学生中的信度和效度。方法:使用中文版善意性别偏见经历量表对828名女大学生进行测量,以性别偏见事件量表(SSE)、善意性别偏见量表(BSI)、自尊量表(SES)、流调中心抑郁量表(CES-D)作为效标问卷。4周后选取150名被试进行重测。结果:修订后的EBSS包含性别差异互补、家长式保护和异性亲密三个维度,共24个题目,具有良好的结构效度(χ^(2)/df=2.32,CFI=0.93,GFI=0.91,TLI=0.92,RMSEA=0.045)。EBSS各维度和总分的Cronbach’s α系数为0.81~0.89,重测信度为0.72~0.79。EBSS总分和各维度与性别偏见事件频率(r=0.28~0.63)、善意性别偏见态度感知(r=0.39~0.57)、自尊水平(r=-0.39~0.15)、抑郁症状(r=-0.12~0.36)均显著相关。结论:善意性别偏见经历量表具有良好的信效度,适用于中国女大学生群体。

关键词：善意性别偏见经历女大学生信度效度