检索结果-南通市图书馆

Designing Symmetric Gradient Honeycomb Structures with Carbon‑Coated Iron‑Based Composites for High‑Efficiency Microwave Absorption

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第11期16卷 224-241页

作者： Yu zhang Shu‑Hao yang Yue xin Bo Cai Peng‑Fei Hu Hai‑yang Dai Chen‑Ming Liang Yun‑Tong Meng Ji‑Hao Su Xiao‑Juan zhang Min Lu Guang‑Sheng Wang School of Chemistry Beihang UniversityBeijing 100191People’s Republic of China School of Electronics and Information Zhengzhou University of Light IndustryZhengzhou 450002People’s Republic of China School of Chemical Engineering Northeast Electric Power UniversityJilin 132000People’s Republic of China College of Chemistry and Materials Engineering Beijing Technology and Business UniversityBeijing 100048People’s Republic of China

The impedance matching of absorbers is a vital factor affecting their microwave absorption(MA)*** this work,we controllably synthesized Material of Institute Lavoisier 88C(MIL-88C)with varying aspect ratios(AR)as a precursor by regulating oil bath conditions,followed by one-step thermal decomposition to obtain carbon-coated iron-based *** the precursor MIL-88C(Fe)preparation conditions,such as the molar ratio between metal ions and organic ligands(M/O),oil bath temperature,and oil bath time,influenced the phases,graphitization degree,and AR of the derivatives,enabling low filler loading,achieving well-matched impedance,and ensuring outstanding MA *** MOF-derivatives 2(MD_(2))/polyvinylidene Difluoride(PVDF),MD_(3)/PVDF,and MD4/PVDF absorbers all exhibited excellent MA properties with optimal filler loadings below 20 wt%and as low as 5 wt%.The MD_(2)/PVDF(5 wt%)achieved a maximum effective absorption bandwidth(EAB)of 5.52 GHz(1.90 mm).The MD_(3)/PVDF(10 wt%)possessed a minimum reflection loss(RL_(min))value of−67.4 at 12.56 GHz(2.13 mm).A symmetric gradient honeycomb structure(SGHS)was constructed utilizing the high-frequency structure simulator(HFSS)to further extend the EAB,achieving an EAB of 14.6 GHz and a RL_(min) of−59.0 *** research offers a viable inspiration to creating structures or materials with high-efficiency MA properties.

关键词： MIL-88C(Fe) Fe/Fe_(3)O_(4)/Fe_(3)C@C Controllable preparation Symmetric gradient honeycomb structure Microwave absorbing

TuBG1 promotes hepatocellular carcinoma via ATR/P53-apoptosis and cycling pathways

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2024年第2期23卷 195-209页

作者： Yan zhang Zhen-Zhen Wang An-Qi Han Ming-Ya yang Li-xin Zhu Fa-Ming Pan Yong Wang Department of General Surgery The Second Hospital of Anhui Medical UniversityHefei 230601China Department of General Surgery The First Affiliated Hospital of Anhui Medical UniversityHefei 230022China Department of Epidemiology and Biostatistics School of Public HealthAnhui Medical UniversityHefei 230032China The Key Laboratory of Major Autoimmune Diseases Anhui Medical UniversityHefei 230032China

Background:As reported,γ-tubulin(TuBG1)is related to the occurrence and development of various types of malignant ***,its role in hepatocellular cancer(HCC)is not *** present study was to investigate the relationship between TuBG1 and clinical parameters and survival in HCC ***:The correlation between TuBG1 and clinical parameters and survival in HCC patients was ex-plored by bioinformatics *** was used for the *** molecular function of TuBG1 was measured using colony formation,scratch assay,trans-well assay and flow *** set enrichment analysis(GSEA)was used to pick up the enriched pathways,followed by investigating the target pathways using Western *** tumor-immune system interactions and drug bank database(TISIDB)was used to evaluate TuBG1 and *** on the TuBG1-related immune genes,a prognostic model was constructed and was further validated internally and ***:The bioinformatic analysis found high expressed TuBG1 in HCC tissue,which was confirmed us-ing immunohistochemistry and Western *** silencing the TuBG1 in HCC cell lines,more G1 arrested cells were found,cell proliferation and invasion were inhibited,and apoptosis was ***,the silence of TuBG1 increased the expressions of Ataxia-Telangiectasia and Rad-3(ATR),phospho-P38 mitogen-activated protein kinase(P-P38MAPK),phospho-P53(P-P53),B-cell lymphoma-2 associated X protein(Bax),cleaved caspase 3 and P21;decreased the expressions of B-cell lymphoma-2(Bcl-2),cyclin D1,cyclin E2,cyclin-dependent kinase 2(CDK2)and *** correlation analysis of immunohistochemistry and clinical parameters and survival data revealed that TuBG1 was negatively corre-lated with the overall *** constructed immune prognosis model could effectively evaluate the ***:The increased expression of TuBG1 in HCC is associated with poor prognosis,which might be involved in the oc

关键词： TuBG1 Hepatocellular carcinoma Apoptosis Cell cycling Immunomodulators

Improving strength-ductility synchronously of Electron beam welded Ti600/Ti2AlNb joint through isothermal forging

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2024年第3期34卷 532-539页

作者： Yongqiang zhang Xiangyi Xue Guoming Zheng Jingli zhang Huiming Li Shewei xin State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an Qin Ti Intelligent Manufacturing Technologies Co.Ltd. Northwest Institute for Nonferrous Metal Research Xi'an University of Science and Technology Avic Xi'an Aircraft Industry Group Company Ltd.

Different alloys can be flexibly combined to meet the performance needs of different parts of the compressor disc by welding process. However, achieving a good combination of dissimilar alloys with different mechanical properties has always been a research difficulty. In this work, a Ti600/Ti2AlNb joint was fabricated through electron beam welding and an isothermal forging was used to optimized its microstructure and mechanical performance. The isothermal forging process increases the ultimate tensile strength（UST） and yield strength（YS）of the Ti600/Ti2AlNb joint by ～18 %, while ～2.5 times the ductility. It is indicated that before forging, the Ti600/Ti2AlNb joint exhibits a much lower strength than that of Ti600 matrix, whereas the opposite is true after isothermal forging. The isothermal forging broken the coarse columnar grains of Ti600/Ti2AlNb joint and render to an equiaxed B2 structure in which the acicular α2and O phase are precipitated, resulting a synchronous enhancement of strength and ductility. This work may pave an effective routine for improving the comprehensive mechanical properties of dissimilar metal welding joint.

关键词： Electron beam welding Isothermal forging Mechanical performance Ti600/Ti2AlNb joint

Accelerated heterogenous ring-opening polymerization towards well-defined helical poly(N-allyl alanine)with clickable side chains

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 2056-2062页

作者： Anyao Ma xin Wang Sunting Xuan Zhengbiao zhang College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China State Key Laboratory of Radiation Medicine and Protection Soochow UniversitySuzhou215123China

Well-defined poly(N-allyl alanine)has been synthesized by heterogenous ring-opening polymerization(HROP)of less reactive N-allyl-alanine N-carboxyanhydride,using acetic acid as the catalyst and benzylamine as the initiator,in non-polar ***,the polymerization exhibited typical features of living polymerization though both monomer(liquid)and polymer(solid)have minimal solubility in *** obtained polymer showed a stable helix structure independent of the temperatures screened,as evidenced by circular dichroism ***,the preliminary study demonstrated that the side chains can be post-functionalized through thiol-ene click chemistry with quantitative ***,this work provides guidance for the development of accelerated HROP of other liquid monomers bearing low ***,the helical and functionalizable poly(N-allyl alanine)could be a useful“clickable platform”for the design of variable biomaterials via efficient click chemistry.

关键词： heterogenous ring-opening polymerization controlled polymerization stable helix clickable N-substituted polypeptide di-substituted polypeptoid

Prediction of lime utilization ratio of dephosphorization in BOF steelmaking based on online sequential extreme learning machine with forgetting mechanism

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 508-517页

作者： Runhao zhang Jian yang Han Sun Wenkui yang State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

The machine learning models of multiple linear regression(MLR),support vector regression(SVR),and extreme learning ma-chine(ELM)and the proposed ELM models of online sequential ELM(OS-ELM)and OS-ELM with forgetting mechanism(FOS-ELM)are applied in the prediction of the lime utilization ratio of dephosphorization in the basic oxygen furnace steelmaking *** ELM model exhibites the best performance compared with the models of MLR and ***-ELM and FOS-ELM are applied for sequential learning and model *** optimal number of samples in validity term of the FOS-ELM model is determined to be 1500,with the smallest population mean absolute relative error(MARE)value of 0.058226 for the *** variable importance analysis reveals lime weight,initial P content,and hot metal weight as the most important variables for the lime utilization *** lime utilization ratio increases with the decrease in lime weight and the increases in the initial P content and hot metal weight.A prediction system based on FOS-ELM is applied in actual industrial production for one *** hit ratios of the predicted lime utilization ratio in the error ranges of±1%,±3%,and±5%are 61.16%,90.63%,and 94.11%,*** coefficient of determination,MARE,and root mean square error are 0.8670,0.06823,and 1.4265,*** system exhibits desirable performance for applications in actual industrial pro-duction.

关键词： basic oxygen furnace steelmaking machine learning lime utilization ratio dephosphorization online sequential extreme learning machine forgetting mechanism

Innovative Mn3-xO4-y@NCA design:Leveraging Mn/O vacancies and amorphous architecture for enhanced sodium-ion storage

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第10期97卷 747-756页

作者： Kaijun Xie xin Liu Kai Xia Lipeng Diao Ping Lu Mengmeng Wang Long Fang Yihui Zou Dongjiang yang Xiaodong zhang College of Chemistry and Chemical Engineering College of Environmental Science and Engineering State Key Laboratory of Bio-fibers and Eco-textiles Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological Textiles Institute of Marine Biobased Materials Qingdao University Institute of Micro/Nano Materials and Devices Ningbo University of Technology

Manganese-based oxide electrode materials suffer from severe Jahn-Teller（J-T） distortion,leading to severe cycle instability in sodium ion ***,it is difficult to adjust the electron at d orbitals exactly to a low spin state to eliminate orbital degeneracy and suppress J-T distortion *** article constructed concentration-controllable Mn/O coupled vacancy and amorphous network in Mn3O4and coated it with nitrogen-doped carbon aerogel(Mn3-xO4-y@NCA).The existence of Mn/O vacancies has been confirmed by scanning transmission electron microscopy（STEM） and positron annihilation lifetime spectroscopy（PALS）.Atomic absorption spectroscopy（AAS） and X-ray photoelectron spectroscopy（XPS） determine the most optimal ratio of Mn/O vacancies for sodium ion storage is 1:*** functional theory（DFT） calculations prove that Mn/O coupled vacancies with the ratio of 1:2could exactly induce a low spin states and a d4electron configuration of Mn,suppressing the J-T distortion *** abundant amorphous regions can shorten the transport distance of sodium ions,increase the electrochemically active sites and improve the pseudocapacitance *** the synergetic effect of Mn/O coupled vacancies and amorphous regions,Mn3-xO4-y@NCA exhibits an energy density of 37.5 W h kg-1and an ultra-high power density of 563 W kg-1in an asymmetric *** sodium-ion batteries,it demonstrates high reversible capacity and exceptional cycling *** research presents a new method to improve the Na+storage performance in manganese-based oxide,which is expected to be generalized to other structural distortion.

关键词： Amorphous network Concentration-controllable Mn/O coupled vacancies Manganese-based metal oxide Sodium ion battery Sodium ion supercapacitor

Automated Identification of Ordered Phases for Simulation Studies of Block Copolymers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第5期42卷 683-692,I0011页

作者： Yu-Chen zhang Wei-Ling Huang Yi-xin Liu State Key Laboratory of Molecule Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China

In unit cell simulations,identification of ordered phases in block copolymers(BCPs)is a tedious and time-consuming task,impeding the advancement of more streamlined and potentially automated research *** this study,we propose a scattering-based automated identification strategy(SAIS)for characterization and identification of ordered phases of BCPs based on their computed scattering *** approach leverages the scattering theory of perfect crystals to efficiently compute the scattering patterns of periodic morphologies in a unit *** the first stage of the SAIS,phases are identified by comparing reflection conditions at a sequence of Miller *** confirm or refine the identification results of the first stage,the second stage of the SAIS introduces a tailored residual between the test phase and each of the known candidate ***,our strategy incorporates a variance-like criterion to distinguish background species,enabling its extension to multi-species BCP *** has been demonstrated that our strategy achieves exceptional accuracy and robustness while requiring minimal computational ***,the approach allows for real-time expansion and improvement to the candidate phase library,facilitating the development of automated research workflows for designing specific ordered structures and discovering new ordered phases in BCPs.

关键词： Block copolymer Phase identification Scattering function

Threshold Selection and Resource Allocation for Quantized Identification

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年第1期37卷 204-229页

作者： WANG Ying LI xin ZHAO Yanlong zhang Ji-Feng Key Laboratory of Systems and Control Institute of Systems ScienceAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

This paper is concerned with the optimal threshold selection and resource allocation problems of quantized identification, whose aims are improving identification efficiency under limited resources. Firstly, the first-order asymptotically optimal quantized identification theory is extended to the weak persistent excitation condition. Secondly, the characteristics of time and space complexities are established based on the Cramér-Rao lower bound of quantized systems. On these basis, the optimal selection methods of fixed thresholds and adaptive thresholds are established under aperiodic signals, which answer how to achieve the best efficiency of quantized identification under the same time and space complexity. In addition, based on the principle of maximizing the identification efficiency under a given resource, the optimal resource allocation methods of quantized identification are given for the cases of fixed thresholds and adaptive thresholds, respectively, which show how to balance time and space complexity to realize the best identification efficiency of quantized identification.

关键词： Quantized output resource allocation system identification threshold selection.

The Mechanics of Tumor Cells Dictate Malignancy via Cytoskeleton-Mediated APC/Wnt/β-Catenin Signaling

在线全文

学校读者我要写书评

暂无评论

Research 2024年第2期2023卷 659-673页

作者： Xi Chen Zichen Xu Kai Tang Guanshuo Hu Pengyu Du Junfang Wang Cunyu zhang Ying xin Keming Li Qiantang zhang Jianjun Hu Zhuxue zhang Mo yang Guixue Wang Youhua Tan The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen518057China Key Laboratory for Biorheological Science and Technology of Ministry of Education State and Local Joint Engineering Laboratory for Vascular ImplantsBioengineering College of Chongqing UniversityChongqing400030China Research Institute of Smart Ageing The Hong Kong Polytechnic UniversityHong KongChina Department of Biomedical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Pathology Guizhou Provincial People's HospitalGuiyangGuizhou550002China

Tumor cells progressively remodel cytoskeletal structures and reduce cellular stiffness during tumor progression,implicating the correlation between cell mechanics and ***,the roles of tumor cell cytoskeleton and the mechanics in tumor progression remain incompletely *** report that softening/stiffening tumor cells by targeting actomyosin promotes/suppresses self-renewal in vitro and tumorigenic potential in ***/strengthening actin cytoskeleton impairs/reinforces the interaction between adenomatous polyposis coli(APC)andβ-catenin,which facilitatesβ-catenin nuclear/cytoplasmic ***β-catenin binds to the promoter of Oct4,which enhances its transcription that is crucial in sustaining self-renewal and *** results demonstrate that the mechanics of tumor cells dictate self-renewal through cytoskeleton-APC-Wnt/β-catenin-Oct4 signaling,which are correlated with tumor differentiation and patient *** study unveils an uncovered regulatory role of cell mechanics in self-renewal and malignancy,and identifies tumor cell mechanics as a hallmark not only for cancer diagnosis but also for mechanotargeting.

关键词： diagnosis skeleton APC