检索结果-内蒙古大学图书馆

Preparation and Mechanical Properties of Bionic Carbon Fiber/Epoxy resin Composites Inspired by Owl Feather

Journal of Bionic engineering 2025年第1期22卷 282-292页

作者： Zerun Yu Jiaan Liu Tian Yang Linyang Zhang Chunhua Hu Key Laboratory of Automobile Materials(Ministry of Education) College of Materials Science and EngineeringJilin UniversityChangchun130022China National Key Laboratory of Advanced Vehicle Integration and Control General R&D InstituteChina FAW Co.LtdChangchun130011China

Insufficient interfacial activity and poor wettability between fibers and matrix are the two main factors limiting the improvement of mechanical properties of Carbon Fiber reinforced Plastics(CFrP).Owl feathers are known for their unique compact structure;they are not only lightweight but also *** this study,an in-depth look at owl feathers was made and it found that owl feathers not only have the macro branches structure between feather shafts and branches but also have fine feather structures on the *** presence of these fine feather structures increases the specific surface area of the plume branches and allows neighboring plume branches to hook up with each other,forming an effective mechanical interlocking *** structures bring owl feathers excellent mechanical *** by the natural structure of owl feathers,a weaving technique and a sizing process were combined to prepare bionic Carbon Fiber(CF)fabrics and then to fabricate the bionic CFrP with structural characteristics similar to owl *** evaluate the effect of the fine feather structure on the mechanical properties of CFrP,a mechanical property study on CFrP with and without the fine feather imitation structure were *** experimental results show that the introduction of the fine feather branch structure enhance the mechanical properties of CFrP ***,the tensile strength of the composites increased by 6.42%and 13.06%and the flexural strength increased by 8.02%and 16.87%in the 0°and 90°sample directions,*** results provide a new design idea for the improvement of the mechanical properties of the CFrP,promoting the application of CFrP in engineering fields,such as automotive transportation,rail transit,aerospace,and construction.

关键词： Carbon fiber reinforced epoxy composites Owl feather Bionic feather structure Mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Ultralow-Vertical-Current Magnetization Switching Effect in an All Van der Waals 2d Heterostructure

引用

Chinese Physics Letters 2025年第2期42卷 239-248页

作者： Hao Wu Li Yang Gaojie Zhang Wen Jin Jie Yu Bichen Xiao Ahmed Annas Wenfeng Zhang Haixin Chang Center for Joining and Electronic Packaging State Key Laboratory of Material Processing and Die&Mold TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen 518000China

The manipulation of magnetization and spin polarization using electrical currents represents a fundamental breakthrough in *** has formed the foundation for data storage and next-generation computing ***-transfer torque(STT)and spin-orbit torque(SOT)have emerged as prominent mechanisms in current-driven magnetization ***,these approaches typically require critical current densities in the range of 10^(6) to 10^(9) A·cm^(-2),resulting in significant heat generation during data writing ***,we report the discovery of an ultralow-vertical-current magnetization switching effect in a van der Waals ferromagnetic/ferroelectric heterostructure based on the modulation of the critical magnetic field(H_(C))using small vertical currents,with a critical current density as low as 1.81A·cm^(-2) and an average effective field(H_(eff)/J_(C))as high as 150.3mT·A^(-1)·cm^(2).This unique magnetization switching effect with ultralow-critical-vertical-current densities typically six to nine orders of magnitude lower than those of the STT and SOT provides a new transformative and viable pathway for developing next-generation spintronic and quantum technologies.

关键词： magnetization critical typically

来源：评论

学校读者我要写书评

暂无评论

Mesoporous SiO2 nanoparticles with low surface energy and multilevel roughness as shale wellbore stabilizers in oil-based drilling fluid

引用

Petroleum science 2025年第1期22卷 384-397页

作者： Hong-Yan du Kai-He Lv Jin-Sheng Sun Mei-Chun Li Yuan Geng Xian-Bin Huang Hao-Kun Shen Muhammad Arqam Khan School of Petroleum Engineering China University of PetroleumEast China Key Laboratory of Unconventional Oil & Gas Development Ministry of Education CNPC Engineering Technology R&D Company Ltd. Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Department of Petroleum Engineering NED University of Engineering & Technology

Oil-based drilling fluids possess excellent properties such as shale inhibition, cuttings suspension, and superior lubrication, making them essential in the development of unconventional oil and gas ***, wellbore instability, caused by the invasion of drilling fluids into shale formations, remains a significant challenge for the safe and efficient extraction of shale oil and gas. This work reports the preparation of mesoporous SiO2nanoparticles with low surface energy, utilized as multifunctional agents to enhance the performance of oil-based drilling fluids aimed at improving wellbore stability. The results indicate that the coating prepared from these nanoparticles exhibit excellent hydrophobicity and antifouling properties, increasing the water contact angle from 32°to 146°and oil contact angle from 24°to134.8°. Additionally, these nanoparticles exhibit exceptional chemical stability and thermal *** these nanoparticles into oil-based drilling fluids reduced the surface energy of the mud cake from 34.99 to 8.17 m J·m-2and increased the roughness of shale from 0.26 to 2.39 μm. These modifications rendered the mud cake and shale surfaces amphiphobic, effectively mitigating capillary infiltration and delaying the long-term strength degradation of shale in oil-based drilling fluids. After 28days of immersion in oil-based drilling fluid, shale cores treated with MF-SiO2exhibited a 30.5% increase in compressive strength compared to untreated cores. Additionally, these nanoparticles demonstrated the ability to penetrate and seal rock pores, reducing the API filtration volume of the drilling fluid from11.2 to 7.6 m L. This study introduces a novel approach to enhance the development of shale gas and oil resources, offering a promising strategy for wellbore stabilization in oil-based drilling fluid systems.

关键词： Fluorosilane Wettability Wellbore stability drilling engineering Self-cleaning Antifouling

来源：评论

学校读者我要写书评

暂无评论

Crack Initiation and Propagation Mechanism of rapidly Tempered High-Si Steel during Hydrogen Embrittlement

引用

Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 2025年第2期111卷 21-31页

作者： Sunako, Manami Mizumoto, Masataka Tanaka, ren Kumai, Shintaro Yamauchi, Yuichiro Ooi, Azusa Tada, Eiji R&D Div. NHK Spring Co. Ltd. Japan Laboratory for Future Interdisciplinary Research of Science and Technology Institute of Integrated Research Institute of Science Tokyo Japan Dept. Materials Science and Engineering School of Materials and Chemical Technology Institute of Science Tokyo Japan

In this study, we focused on fine dispersion of Fe2-3C(Ε) by combining the addition of Si and rapid tempering to improve the hydrogen embrittlement resistance of high-strength spring steels. The aim of this study is to clarify the fracture mechanism of rapidly tempered high-Si steels: the JISSUP7 (2.0Si) and SAE9254 (1.4Si) spring steels were tempered at different tempering rates by induction (IH) and furnace heating (FH) methods. Bending test were carried out during the cathodic hydrogen charging to observe the fracture origin and morphology of the steels. The size and volume of carbides were quantified using small-angle X-ray scattering method (SAXS) and synchrotron radiation Xrd. The distribution of carbides was observed with the replica method: facets were observed at the fracture origin of the 2.0Si-IH steel and 1.4Si-IH steel, which contained retained γ in the microstructure. It was considered that the facets formed because retained γ at the grain boundaries transformed into martensite during hydrogen embrittlement, promoting intergranular cracking;the 2.0Si-IH steel contained the largest amount of retained γ, but also contained fine Fe2-3C(Ε) in the lath. This suggests that dislocations and hydrogen are less likely to accumulate at the grain boundaries, resulting in the longest fracture life. In other words, in rapidly tempered high Si steels (2.0Si-IH steels), the fine dispersion of Fe2-3C(Ε) has more influence on the suppression of crack initiation and propagation than the increase in the amount of retained γ, and this contributes significantly to the fracture life. © 2025 The Iron and Steel Institute of Japan.

关键词： Hydrogen embrittlement

来源：评论

学校读者我要写书评

暂无评论

Polyethersulfone-modulated Matrimid®-derived carbon molecular sieve membranes for enhanced C3H6/C3H8 separation

引用

Journal of membrane science 2025年 727卷

作者： Sun, Fake Gao, Zeyuan Sun, Yongchao Liu, Yijun Guan, Jianyu Li, Hongjin Li, Tianyou He, Gaohong Ma, Canghai State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and Technology School of Chemical Engineering Dalian University of Technology Dalian116024 China

Polymer-derived carbon molecular sieve (CMS) membranes hold significant potentials for propylene/propane (C3H6/C3H8) separation;however, further enhancement of their molecular sieving properties remains a critical challenge. In this study, we present a novel approach to regulating the pore structure of CMS membranes by incorporating the rubbery polyethersulfone (PES) into the Matrimid® precursor to fabricate CMS membranes. The incorporation of PES during pyrolysis creates voids between Matrimid® molecular chains, increasing the chain d-spacing and the content of ultramicropores, significantly enhancing the C3H6/C3H8 separation performance of the CMS membranes. As the PES content in the precursor membrane increases, the rising content of ultramicropores leads to improved C3H6/C3H8 selectivity, along with a minor increase in gas permeability. Notably, the 60 %Matrimid®+40 %PES-550 CMS membrane displays a C3H6 permeability of 70.3 Barrer with a C3H6/C3H8 selectivity of 21.4, representing increases of 194 % and 188 %, respectively, compared to Matrimid®-550 and exceeding the C3H6/C3H8 separation upper bound. Furthermore, under mixed gas separation conditions with a 50/50 (mol%) C3H6/C3H8 feed, this membrane exhibited a C3H6 permeability of 47.6 Barrer with a C3H6/C3H8 selectivity of 18.3, also surpassing the mixed gas upper bound for C3H6/C3H8 separation. The design principle of CMS membranes in this work provides a new approach for the preparation of high-performance CMS membranes, with the potential for separating the challenging C3H6/C3H8 mixture. © 2025

关键词： Sieves

来源：评论

学校读者我要写书评

暂无评论

Non-specific/specific SErS spectra concatenation for precise bacteria classifications with few samples using a residual neural network

引用

Chinese Chemical Letters 2025年第1期36卷 484-490页

作者： Feihu Wu Gengwen Chen Kaitao Lai Shiqing Zhang Yingchao Liu ruijian Luo Xiaocong Wang Pinzhi Cao Yi Ye Jiarong Lian Junle Qu Zhigang Yang Xiaojun Peng Shenzhen Key Laboratory of Photonics and Biophotonics&College of Physics and Optoelectronic Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060China Hematology Reagent R&D department Mindray Bio-medical Electronics Co.LTD.Shenzhen 518107China State Key Laboratory of Fine Chemicals College of Material Science and EngineeringShenzhen UniversityShenzhen 518060China

deep learning neural network incorporating surface enhancement raman scattering technique(SErS)is becoming as a powerful tool for the precise classifications and diagnosis of bacterial ***,the large amount of sample requirement and time-consuming sample collection severely hinder its *** herein propose a spectral concatenation strategy for residual neural network using nonspecific and specific SErS spectra for the training data augmentation,which is accessible to acquiring larger training dataset with same number of SErS spectra or same size of training dataset with fewer SErS spectra,compared with pure non-specific SErS *** this strategy,the training loss exhibit rapid convergence,and an average accuracy up to 100%in bacteria classifications was achieved with50 SErS spectra for each kind of bacterium;even reduced to 20 SErS spectra per kind of bacterium,classification accuracy is still>95%,demonstrating marked advantage over the results without spectra *** method can markedly improve the classification accuracy under fewer samples and reduce the data collection workload,and can evidently enhance the performance when used in different machine learning models with high generalization ***,this strategy is beneficial for rapid and accurate bacteria classifications with residual neural network.

关键词： SErS deep learning resnet Bacteria classification Spectra concatenation

来源：评论

学校读者我要写书评

暂无评论

Built-in electric field induced by defected carbons adjacent to graphitic nitrogen valley for efficient oxygen reduction reaction and zinc-air batteries

引用

Journal of Energy Chemistry 2025年第4期103卷 813-825页

作者： Na Li Tingting Ma Huihui Wang Jiayi Li dingrong Qiu Zhen Meng Jiangdu Huang Lijun Sui Faming Han Huidan Lu Yongping Liu Sundaram Chandrasekaran Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional MaterialsCollege of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004GuangxiChina Guangxi Colleges and Universities Key Laboratory of Surface and Interface Electrochemistry College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004GuangxiChina Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials Institute of New Energy for VehiclesSchool of Materials Science and EngineeringTongji UniversityShanghai 201804China

rational design of defected carbons adjacent to nitrogen(N)dopants is a fascinating but challenging approach for enhancing the catalytic performance of N-doped ***,the combined effect of heteroatom doping and defect engineering can efficiently increase the oxygen reduction reaction(Orr)ability of inactive carbons through charge ***,we report that an enhanced built-in electric field caused by the combined effect of N-doping and carbon defects in the twodimensional(2d)mesoporous N-doped carbon nano flakes(NCNF)is a promising technique for improving Orr *** a result,the NCNF exhibits more promising Orr activity than Pt/C and similar performance with reported robust *** experimental and theoretical investigations suggest that topologically defected carbon adjacent to the graphitic valley nitrogen is a real active site,rendering optimal energy for the adsorption of Orr intermediates and lowering the total energy barrier for ***,NCNF-based Zn-air batteries exhibited an excellent power density and specific capacity of~121.10 mW cm^(-2)and~679.86 mA h g_(Zn)^(-1),*** study not only offers new insights into defected carbons with graphitic valley N for Orr but also proposes novel catalyst design principles and provides a solid grasp of the built-in electric field effect on the Orr performance of defective catalysts.

关键词： defective carbon Built-in electric field Graphitic valley nitrogen-doped carbon defects Oxygen reduction reaction Zn-air batteries

来源：评论

学校读者我要写书评

暂无评论

Acetonitrile-driven universal CO production across diverse metal catalysts

引用

science China Chemistry 2025年第5期68卷 2110-2116页

作者： Benqiang Tian Yan Xu Haoyang Wu Yang Zhong Marshet Getaye Sendeku Haijun Xu Yun Kuang Jiazhan Li Xiaoming Sun State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical Technology College of Energy Storage Technology Shandong University of Science and Technology Weichai Power Co. Ltd. Ocean Hydrogen Energy R&D Center Research Institute of Tsinghua University in Shenzhen College of Mathematics and Physics Beijing University of Chemical Technology

Electrocatalytic CO2reduction to valuable chemicals with exceptional selectivity is highly ***,it is still challenging to bypass the competitive hydrogen evolution reaction（HEr） and branched pathways via regulating the structure of ***,we disclose an unconventional solvent regulation strategy to realize near-unity CO2-to-CO conversion across diverse metal catalysts including Pt,Fe,Co,Ni,Mo,W,Nb,Cu,Ag,Au,Zn,Sn,and *** water content in the acetonitrile electrolyte is precisely controlled,and the ratio of hydrogen evolution shows a positive correlation to the hydrogen binding energy of metal elements and the concentration of ***,we find that the acetonitrile could impair the interaction between*CO and metal electrode and thus promote the desorption of**** a result,the Cu electrodes display poor activity to produce hydrocarbons in acetonitrile,unlike that in aqueous solutions,and near 100%CO Faradaic efficiencies over a wide potential window（-1.9 to -2.4 V vs. Fc/Fc+） are achieved at a water concentration of 0.19 *** work reveals the solvent effect on determining the CO2rr selectivity,which adds a new dimension to tailoring the final products besides catalyst optimization.

关键词： electrocatalytic CO2 reduction nonaqueous electrolytes CO production acetonitrile

来源：评论

学校读者我要写书评

暂无评论

Effect of purine diet on prognosis of deep brain stimulation for Parkinson's disease

引用

Food science and Human Wellness 2025年第3期14卷 1026-1033页

作者： Bowen Chang Yuge Jiang Chuanxing Feng Bowen Li Jiaming Mei Chaoshi Niu Department of Neurosurgery The First Affi liated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Key Laboratory of Xin’an Medicine Ministry of EducationAnhui Provincial Key Laboratory of R&D of Chinese MedicineAnhui University of Chinese MedicineHefei 230038China Center for Food Nutrition and Functional Food Engineering School of Food Science and TechnologyJiangnan UniversityWuxi 214122China

Uric acid(UA)is a naturally antioxidant that is strongly associated with the development and progression of Parkinson's disease(Pd).The purine diet is an important exogenous pathway that modulates blood UA *** brain stimulation(dBS)is an important tool for Pd *** study aimed to explore the effects of preoperative purine diet on the prognosis of patients with Pd after ***-four patients with Pd who underwent dBS were included in this study,and their clinical data,blood UA levels,and daily purine *** were followed up for improvement 1 year after *** found that patient higher purine intake was strongly associated with the rate of improvement after dBS and was a protective factor for patient *** purine intake from meat and seafood was significantly higher in the responsive patients than in the lessresponsive *** analysis showed that UA mediated 78%of the effect of purine intake on motor symptom improvement after *** summary,we observed that purine intake is strongly associated with the rate of improvement in motor symptoms after subthalamic nucleus-dBS in patients with *** study provides a reference for preoperative diet planning in patients with Pd undergoing dBS.

关键词： Purine diet Nutrition Parkinson’s disease deep brain stimulation Brain connectivity

来源：评论

学校读者我要写书评

暂无评论

recovery of rare earth elements and thorium from acid leaching residue of ionic rare earth concentrates

引用

Journal of rare Earths 2025年第4期43卷 794-804,I0006页

作者： Qiaofa Lan Xiaolin Zhang Fei Niu donghui Liu Leiting Shen Youming Yang Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China National Engineering Research Center for Ionic Rare Earth Ganzhou341000China School of Metallurgy and Environment Central South UniversityChangsha410083China Guangdong Provincial Key Lab of R&D for Resource Utilization and Disposal of Hazardous Liquids Shenzhen518057China School of Rare Earth and New Materials Engineering Gannan University of Science and TechnologyGanzhou341000China Key Laboratory of Development and Application of Ionic Rare Earth Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou341000China

The acid leaching residue(ALr)of ionic rare earth(IrE)concentrates containing radioactive elements such as thorium(Th)is classified as low-level radioactive *** holds valuable strategic resources such as rare earth and Th,while improper long-term heaping storage of ALr poses a substantial environmental *** paper proposes a comprehensive process involving low-temperature roasting,hydrochloric acid leaching,single extractant enrichment,and stepwise stripping to recover rare earth elements and thorium from *** achieved leaching efficiencies are 80.11%of LnY,99.43%of Sc(Ⅲ),and 98.67%of Th(Ⅳ)after the carbonization of the organic phase in the ALr through low-temperature *** large amounts of acid and impurities present in the leachate,2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester(HEHEHP)still exhibits nearly 100%extraction efficiency for Sc(Ⅲ)and Th(Ⅳ).The effective separation of LnY,Th(Ⅳ),and Sc(Ⅲ)was achieved by implementing fractional extraction enrichment of Th(Ⅳ)and Sc(Ⅲ),followed by Th(Ⅳ)removal through H_(2)SO_(4)and Sc(Ⅲ)removal via NaOH from the loaded organic *** scheme successfully achieves a recovery of rE and Th and offers a viable solution for the safe disposal of ALr.

关键词： Low-level radioactive waste rare earths Thorium Solvent extraction resource recovery

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：