检索结果-南通市图书馆

Effect of nano-TiC dopant size on magnetic properties and corrosion resistance of hot-deformed NdFeB

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第6期40卷 930-936,I0003页

作者： Xiaoqiang Li Jian Li Kai Xu Zhiwei Wang Yu Bian Yuxuan Shao chengchao hu Junjie Ni School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi'an 710049China Liaocheng Key Laboratory of Magnetic Materials Liaocheng 252500China

Effects of dopant size on the magnetic properties and corrosion behavior of hot-deformed NdFeB with the intergranular additions of nano-TiC were investigated using X-ray diffraction(XRD),X-ray photoelectron spectrometer(XPS),scanning electron microscopy(SEM),electrochemical and magnetic measurement *** of 50 nm-TiC,unlike 30 nm- and 40 nm-TiC,are found to increase the magnetic energy product and comprehensive magnetic properties,due in main to the improvement of magnet orientation by more strip-shaped Nd-rich ***-TiC dopants especially with a size of40 nm can increase the electrochemical corrosion resistance of *** is attributed to the hindrance of additives on the reaction channel formation and their barrier effect on the oxidations of Nd and *** 40 nm-TiC doped magnet,the charge transfer resistance in electric double layer structure reaches 15000 Ω·cm^(2) that is one order of magnitude higher than other cases,which is responsible for the lowe st corrosion current density and accordingly the best anti-corrosion properties.

关键词： NdFeB Nano-TiC Intergranular addition Magnetic properties Electrochemical corrosion Rare earths

Large electrostrictive effect and strong photoluminescence properties in Sm_(2)O_(3)-modified lead-free potassium sodium niobate-based piezoelectric ceramics

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2020年第4期6卷 768-780页

作者： Wei Li Jigong Hao Peng Fu Juan Du Peng Li chengchao hu Wei Li Zhenxing Yue School of Materials Science and Engineering Liaocheng UniversityLiaocheng252059China State Key Laboratory of New Ceramic and Fine Processing Tsinghua UniversityBeijing100084China

In this work,the phase transition behavior and electrostrictive and photoluminescence properties of Sm_(2)O_(3)-modified 0.965(K_(0.48)Na_(0.52))(Nb_(0.95)Sb_(0.05))e_(0.035)Bi_(0.5)(Na_(0.82)K_(0.18))_(0.5)HfO_(3)(KNNSe0.035BNKH)ceramics were *** showed that the phase structure of the Sm2O3-modified ceramics evolved from coexisting orthogonal and tetragonal ferroelectric phases to a relaxor pseudocubic phase along with the strong destruction of the long-range ferroelectric *** switching in Smmodified ceramics with a relaxor pseudocubic phase became difficult,evident from the PFM ***,large electrostrictive effect with an electrostrictive coefficient of 0.022 m4/C2 was obtained in 1.0 mol%Sm-modified *** regard to long-term stability,the materials exhibited temperature-independent(20-100℃)and fatiguefree(up to 105 cycles)behavior,which guarantees their application in various *** KNNSe0.035BNKHexSm ceramics have the advantages of photoluminescence performance with bright orange emission under 407 nm visible light ***,KNNS0.035BNKHxSm ceramics have broad application prospects in multifunction devices due to their large electrostrictive effect,excellent photoluminescence performance,and long-term stability.

关键词： Sintering Ferroelectric properties Piezoelectric properties Actuators

Grothendieck环G_(0)(D(H_(4)))的自同构群

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

扬州大学学报（自然科学版） 2021年第3期24卷 1-4页

作者：胡承超潘梦雅陈惠香扬州大学数学科学学院江苏扬州225002

研究Sweedler 4-维Hopf代数H_(4)Drinfeld偶D(H_(4))的Grothendieck环G_(0)(D(H_(4)))的自同构群,给出了G_(0)(D(H_(4)))所有环自同构的表达式,并证明了Grothendieck环G_(0)(D(H_(4)))的自同构群同构于Klein群K_(4).

关键词： Hopf代数 Drinfeld偶 Grothendieck环自同构群

在线全文

学校读者我要写书评

暂无评论

加蓬共和国PO公路项目沿线特殊岩土简析

工程建设 2017年第7期49卷 83-88页

作者：张志冰胡成超中国公路工程咨询集团有限公司北京100097 中交公路规划设计院有限公司北京100088

在非洲加蓬共和国PO公路工程的勘测设计中,通过大量的勘察试验,总结了该区域勘察试验成果,发现该沿线分布了较多的特殊性岩土,有的与国内相似之处,有的具有明显的区域特点。通过对本项目勘查试验成果的总结,简要分析了该项目沿线的特殊... 详细信息

在非洲加蓬共和国PO公路工程的勘测设计中,通过大量的勘察试验,总结了该区域勘察试验成果,发现该沿线分布了较多的特殊性岩土,有的与国内相似之处,有的具有明显的区域特点。通过对本项目勘查试验成果的总结,简要分析了该项目沿线的特殊性岩土,并列出了具有代表性的试验数据和图表,以供今后在相关区域或相关领域的工程技术人员参考。

关键词：特殊岩土高液限高灵敏度软土高有机质土大孔隙比变色土

Photo‑Energized MoS_(2)/CNT Cathode for High‑Performance Li–CO_(2)Batteries in a Wide‑Temperature Range

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第1期17卷 160-175页

作者： Tingsong hu Wenyi Lian Kang hu Qiuju Li Xueliang Cui Tengyu Yao Laifa Shen Jiangsu Key Laboratory of Materials and Technologies for Energy Storage College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

Li–CO_(2) batteries are considered promising energy storage systems in extreme environments such as Mars;however,severe performance degradation will occur at a subzero temperature owning to the sluggish reaction ***,a photo-energized strategy adopting sustainable solar energy in wide working temperature range Li–CO_(2) battery was achieved with a binder-free MoS_(2)/carbon nanotube(CNT)photo-electrode as *** unique layered structure and excellent photoelectric properties of MoS_(2) facilitate the abundant generation and rapid transfer of photo-excited carriers,which accelerate the CO_(2) reduction and Li_(2)CO_(3) decomposition upon *** illuminated battery at room temperature exhibited high discharge voltage of 2.95 V and mitigated charge voltage of 3.27 V,attaining superior energy efficiency of 90.2%and excellent cycling stability of over 120 *** at an extremely low temperature of−30℃,the battery with same electrolyte can still deliver a small polarization of 0.45 V by the photoelectric and photothermal synergistic mechanism of MoS_(2)/CNT *** work demonstrates the promising potential of the photo-energized wide working temperature range Li–CO_(2) battery in addressing the obstacle of charge overpotential and energy efficiency.

关键词： Li-CO_(2)batteries Photo-energized Wide operation-temperature Kinetics MoS_(2)

Fabrication and Mechano-sensing Characteristics of Bending Polypyrrole Actuator

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 240-245页

作者： CHEN Jinyou hu Wei School of Automotive Engineering Hunan Financial&Industrial Vocational-technical CollegeHengyang 421002China College of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China

To prepare a conductive polymer actuator with decent performance,a self-built experimental platform for the preparation of polypyrrole film is *** of the essential goals is to examine the mechanical characteristics of the actuator in the presence of various combinations of process parameters,combined with the orthogonal test method of"four factors and three levels".The bending and sensing characteristics of actuators of various sizes are methodically examined using a self-made bending polypyrrole *** functional relationship between the bending displacement and the output voltage signal is established by studying the characteristics of the actuator sensor subjected to various degrees of *** experimental results reveal that the bending displacement of the actuator tip almost exhibits a linear variation as a function of length and *** the voltage reaches 0.8 V,the bending speed of the actuator tends to be ***,the mechanical properties of the self-assembled polypyrrole actuator are verified by the design and fabrication of the microgripper.

关键词： conductive polymer polypyrrole mechanical characteristics actuators sensing characteristics

马来西亚东海岸码头堆场泥炭土地基中水泥搅拌桩的处置效果及参数分析

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

水运工程 2023年第11期 204-210页

作者：胡成超王凌霄王艳萍李康沈宇鹏中交公路规划设计院有限公司北京100010 北京交通大学土木建筑工程学院北京100044

以马来西亚东海岸某码头内堆场水泥搅拌桩处理泥炭土工程为研究背景,开展水泥桩室内配合比试验、试桩终孔参数分析、试桩工效分析等工作,系统研究多种配合比条件下水泥搅拌桩复合地基的强度变化和处置效果。结果表明:由于两试桩点土层... 详细信息

以马来西亚东海岸某码头内堆场水泥搅拌桩处理泥炭土工程为研究背景,开展水泥桩室内配合比试验、试桩终孔参数分析、试桩工效分析等工作,系统研究多种配合比条件下水泥搅拌桩复合地基的强度变化和处置效果。结果表明:由于两试桩点土层分布及工程性质不同,试桩点1采用16%、18%、20%3种配合比时,28 d芯样无侧限抗压强度(UCS)普遍高,强度富余度较大;试桩点2采用18%、20%、22%3种配合比时,7~9 m处强度低于其他深度,建议采用18%的水泥掺量;表层腐植土地段采用其他加固措施或挖除换填的工艺来保证施工质量。最终,使用水泥搅拌桩加固泥炭土可以取得较好的效果。

关键词：泥炭土地基处理水泥搅拌桩无侧限抗压强度

同方期刊数据库

Optimizing Fine-Tuning in Quantized Language Models:An In-Depth Analysis of Key Variables

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 307-325页

作者： Ao Shen Zhiquan Lai Dongsheng Li Xiaoyu hu National Key Laboratory of Parallel and Distributed Computing National University of Defense TechnologyChangsha410073China Strategic Assessments and Consultation Institute Academy of Military ScienceBeijing100091China

Large-scale Language Models(LLMs)have achieved significant breakthroughs in Natural Language Processing(NLP),driven by the pre-training and fine-tuning *** this approach allows models to specialize in specific tasks with reduced training costs,the substantial memory requirements during fine-tuning present a barrier to broader ***-Efficient Fine-Tuning(PEFT)techniques,such as Low-Rank Adaptation(LoRA),and parameter quantization methods have emerged as solutions to address these challenges by optimizing memory usage and computational *** these,QLoRA,which combines PEFT and quantization,has demonstrated notable success in reducing memory footprints during fine-tuning,prompting the development of various QLoRA *** these advancements,the quantitative impact of key variables on the fine-tuning performance of quantized LLMs remains *** study presents a comprehensive analysis of these key variables,focusing on their influence across different layer types and depths within LLM *** investigation uncovers several critical findings:(1)Larger layers,such as MLP layers,can maintain performance despite reductions in adapter rank,while smaller layers,like self-attention layers,aremore sensitive to such changes;(2)The effectiveness of balancing factors depends more on specific values rather than layer type or depth;(3)In quantization-aware fine-tuning,larger layers can effectively utilize smaller adapters,whereas smaller layers struggle to do *** insights suggest that layer type is a more significant determinant of fine-tuning success than layer depth when optimizing quantized ***,for the same discount of trainable parameters,reducing the trainable parameters in a larger layer is more effective in preserving fine-tuning accuracy than in a smaller *** study provides valuable guidance for more efficient fine-tuning strategies and opens avenues for further research into optimizing LLM

关键词： Large-scale Language Model Parameter-Efficient Fine-Tuning parameter quantization key variable trainable parameters experimental analysis

Repetitive transcranial magnetic stimulation in Alzheimer’s disease:effects on neural and synaptic rehabilitation

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 2025年第2期20卷 326-342页

作者： Yi Ji Chaoyi Yang Xuerui Pang Yibing Yan Yue Wu Zhi Geng Wenjie hu Panpan hu Xingqi Wu Kai Wang Department of Neurology The First Affiliated Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina Anhui Province Key Laboratory of Cognition and Neuropsychiatric Disorders HefeiAnhui ProvinceChina Collaborative Innovation Center of Neuropsychiatric Disorders and Mental Health HefeiAnhui ProvinceChina Institute of Artificial Intelligence Hefei Comprehensive National Science CenterHefeiAnhui ProvinceChina Department of Psychology and Sleep Medicine The Second Affiliated Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina

Alzheimer’s disease is a neurodegenerative disease resulting from deficits in synaptic transmission and *** Alzheimer’s disease brain tends to be hyperexcitable and hypersynchronized,thereby causing neurodegeneration and ultimately disrupting the operational abilities in daily life,leaving patients *** transcranial magnetic stimulation is a cost-effective,neuro-modulatory technique used for multiple neurological *** the past two decades,it has been widely used to predict cognitive decline;identify pathophysiological markers;promote neuroplasticity;and assess brain excitability,plasticity,and *** has also been applied to patients with dementia,because it can yield facilitatory effects on cognition and promote brain recovery after a neurological ***,its therapeutic effectiveness at the molecular and synaptic levels has not been elucidated because of a limited number of *** study aimed to characterize the neurobiological changes following repetitive transcranial magnetic stimulation treatment,evaluate its effects on synaptic plasticity,and identify the associated *** review essentially focuses on changes in the pathology,amyloidogenesis,and clearance pathways,given that amyloid deposition is a major hypothesis in the pathogenesis of Alzheimer’s *** mechanisms associated with repetitive transcranial magnetic stimulation procedures and different pathways mediating gene transcription,which are closely related to the neural regeneration process,are also ***,we discuss the outcomes of animal studies in which neuroplasticity is modulated and assessed at the structural and functional levels by using repetitive transcranial magnetic stimulation,with the aim to highlight future directions for better clinical translations.

关键词： Alzheimer’s disease amyloid deposition apoptotic mechanisms biomarker neural regeneration neurodegeneration repetitive transcranial magnetic stimulation synaptic plasticity