检索结果-南通市图书馆

Radioactive Ion Beam Line in Lanzhou

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 1994年 19-,30页

作者： Zhan Wenlong Guo Zhongyan Liu Guanhua Yin Quanmin zhou jianqun and wang yifang

关键词： Lanzhou

THE STABLE RECONSTRUCTION OF STRONGLY-DECAYING BLOCK SPARSE SIGNALS

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

Acta Mathematica Scientia 2024年第5期44卷 1787-1800页

作者： yifang YANG Jinping wang School of Mathematics and Statistics Ningbo UniversityNingbo315211China

In this paper,we reconstruct strongly-decaying block sparse signals by the block generalized orthogonal matching pursuit(BgOMP)algorithm in the l2-bounded noise *** some restraints on the minimum magnitude of the nonzero elements of the strongly-decaying block sparse signal,if the sensing matrix satisfies the the block restricted isometry property(block-RIP),then arbitrary strongly-decaying block sparse signals can be accurately and steadily reconstructed by the BgOMP algorithm in ***,we conjecture that this condition is sharp.

关键词： compressed sensing strongly-decaying block sparse signal block generalized OMP block-RIP

Crystalline-amorphization-recrystallization structural transition and emergent superconductivity in van der Waals semiconductor SiP under compression

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

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 115-122页

作者： Chunhua Chen Zhenyu Ding Yonghui zhou yifang Yuan Nixian Qian Jing wang Shuyang wang Ying zhou Chao An Min Zhang Xuliang Chen Xiaoping Yang Mingliang Tian Zhaorong Yang Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityHefei 230601China Institutes of Physical Science and Information Technology Anhui UniversityZhengzhou 450001China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

van der Waals(vdW)semiconductors have gained significant attention due to their unique physical properties and promising applications,which are embedded within distinct crystallographic ***,we report a pressure-induced crystallineamorphization-recrystallization transition under compression in binary vdW semiconductor *** compression to 52 GPa,bulk SiP undergoes a consecutive phase transition from pristine crystalline to amorphous phase,ultimately to recrystallized *** employing synchrotron X-ray diffraction experiments in conjunction with high-pressure crystal structure searching techniques,we reveal that the recrystallized Si P hosts a tetragonal structure(space group I4mm)and further transforms partially into a cubic phase(space group Fm3m).Consistently,electrical transport and alternating-current magnetic susceptibility measurements indicate the presence of three superconducting phases,which are embedded in separate crystallographic symmetries—the amorphous,tetragonal,and cubic ***,a high superconducting transition temperature of 12.3 K is observed in its recovered tetragonal phase during *** findings uncover a novel phase evolution path and elucidate a pressure-engineered structure-property relationship in vdW semiconductor *** results not only offer a new platform to explore the transformation between different structures and functionalities,but also provide new opportunities for the design and exploration of advanced devices based on vdW materials.

关键词： recrystallization transition amorphous

Sustained release of vascular endothelial growth factor A and basic fibroblast growth factor from nanofiber membranes reduces oxygen/glucose deprivation-induced injury to neurovascular units

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第4期19卷 887-894页

作者： yifang Wu Jun Sun Qi Lin Dapeng wang Jian Hai Department of Neurosurgery Tongji HospitalSchool of MedicineTongji University Department of Pharmacy Institute of Medical SciencesShanghai Jiao Tong University School of Medicine

Upregulation of vascular endothelial growth factor A/basic fibroblast growth factor(VEGFA/b FGF)expression in the penumbra of cerebral ischemia can increase vascular volume,reduce lesion volume,and enhance neural cell proliferation and differentiation,thereby exerting neuroprotective ***,the beneficial effects of endogenous VEGFA/b FGF are limited as their expression is only transiently *** this study,we generated multilayered nanofiber membranes loaded with VEGFA/b FGF using layer-by-layer self-assembly and electrospinning *** found that a membrane containing 10 layers had an ideal ultrastructure and could efficiently and stably release growth factors for more than 1 *** 10-layered nanofiber membrane promoted brain microvascular endothelial cell tube formation and proliferation,inhibited neuronal apoptosis,upregulated the expression of tight junction proteins,and improved the viability of various cellular components of neurovascular units under conditions of oxygen/glucose ***,this nanofiber membrane decreased the expression of Janus kinase-2/signal transducer and activator of transcription-3(JAK2/STAT3),Bax/Bcl-2,and cleaved ***,this nanofiber membrane exhibits a neuroprotective effect on oxygen/glucose-deprived neurovascular units by inhibiting the JAK2/STAT3 pathway.

关键词： brain ischemia brain microvascular endothelial cell nanofiber membrane neurovascular unit

Ultra-high specific surface area activated carbon from Taihu cyanobacteria via KOH activation for enhanced methylene blue adsorption

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第3期67卷 106-116页

作者： yifang Mi Wenqiang wang Sen Zhang Yalong Guo Yufeng Zhao Guojin Sun Zhihai Cao Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing&Finishing of Textiles Ministry of EducationZhejiang Provincial Engineering Research Center for Green and Low-carbon Dyeing&FinishingZhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory for Technology in Rural Water Management of Zhejiang Province Zhejiang University of Water Resources and Electric PowerHangzhou 310018China

Cyanobacteria-based activated carbon(CBAC)was successfully prepared by pyrolysis-activation of Taihu *** the impregnation ratio and activated temperature were 2 and 800-C,respectively,the optimal CBACs possessed an ultra-high specific surface(2178.90 m^(2)·g^(-1))and plenty of micro-and meso-pores,as well as a high pore volume(1.01 cm^(3)·g^(-1)).Ascribed to ultra-high surface area,π-π interaction,electrostatic interaction,as well as hydrogen-bonding interactions,the CBACs displayed huge superiority in efficient dye *** saturated methylene blue adsorption capacity by CBACs could be as high as 1143.4 mg·g^(-1),superior to that of other reported biomass-activated *** adsorption was endothermic and modeled well by the pseudo-second-order kinetic,intra-particle diffusion,and Langmuir *** work presented the effectiveness of Taihu cyanobacteria adsorbent ascribed to its super large specific surface area and high adsorption ability.

关键词： Activated carbon Biomass Dye adsorption Taihu cyanobacteria

Screening of glucosinolates degrading lactic acid bacteria and their utilization in rapeseed meal fermentation

在线全文

学校读者我要写书评

暂无评论

Grain & Oil Science and Technology 2024年第3期7卷 168-176页

作者： yifang Chen Chong Xie Muhammad Bilal Pei wang Runqiang Yang College of Food Science and Technology Whole Grain Food Engineering Research CenterNanjing Agricultural UniversityNanjing 210095JiangsuChina The Sanya Institute of Nanjing Agricultural University Sanya 572024HainanChina National Technique Innovation Center for Regional Wheat Production/Key Laboratory of Crop Physiology Ecologyand ManagementMinistry of Agriculture/National Engineering and Technology Center for Information AgricultureNanjing Agricultural UniversityNanjing 210095JiangsuChina

Rapeseed meal is a promising food ingredient, but its utilization is limited by the presence of some potentially harmful ingredients, such as glucosinolates. Fermentation is a cost-effective method of detoxication but a food-grade starter culture with glucosinolates degradation capacity is required. In this study, 46 strains of lactic acid bacteria from traditional paocai brines were screened for their ability to glucosinolate degradation. The results showed that more than 50% of the strains significantly degraded glucosinolates. Two strains of Lactiplantibacillus(p7 and s7) with high capacity of glucosinolates degradation through producing enzymes were identified. Then,an optimized condition for rapeseed meal fermentation by p7 was established to degrade glucosinolates, which can achieve about 80% degradation. UPLC/Q-TOF-MS analysis showed that the degradation rate of individual glucosinolates was different and the degradation rate of gluconapin and progoitrin in rapeseed meal can reach more than 90%. Meanwhile, fermentation with p7 can improve safety of rapeseed meal by inhibiting the growth of Enterobacteriaceae and improve its nutritional properties by degrading phytic acid. The in vitro digestion experiments showed that the content of glucosinolates in rapeseed meal decreased significantly during gastric digestion. Meanwhile, fermentation with p7 can greatly improve the release of soluble protein and increase the contents of free essential amino acids, such as lysine(increased by 12 folds) and methionine(increased by 10 folds).

关键词： Rapeseed meal Glucosinolates Fermentation Lactic acid bacteria In vitro digestion

Reversibly size-switchable polyion complex micelles for antiangiogenic cancer therapy

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第7期35卷 377-382页

作者： Mengjuan Sun Muye zhou yifang Xiao Hailei Tang Jinhua Chen Ruitao Zhang Chunjiayu Li Qi Ya Qian Chen Jiasheng Tu Qiyue wang Chunmeng Sun NMPA Key Laboratory for Research and Evaluation of Pharmaceutical Preparations and Excipients China Pharmaceutical UniversityNanjing 210009China State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 211198China Department of Pharmaceutics School of PharmacyChina Pharmaceutical UniversityNanjing 211198China Jiangsu Provincial Key Laboratory of Drug Metabolism and Pharmacokinetics China Pharmaceutical UniversityNanjing 210009China School of Pharmaceutical Science Nanjing Tech UniversityNanjing 211816China

Size is one of the most important characteristics of nanoparticles to influence their biodistribution and antitumoral *** with large sizes have difficulty in deep tumor penetration,while small particles are easily removed from tumor tissues due to the high tumor interstitial fluid *** address these issues,an intelligent core-crosslinked polyion complex micelle(cPCM)with a reversibly sizeswitchable feature was engineered in this *** micelles are consisting of methoxy poly(ethylene glycol)-poly(D,L-lactide)copolymer(mPEG-PLA),mPEG-PLA-(HE)6CC,and mPEG-PLA-(RG)6CC at an optimal mass ratio of 6:1:1 with an antiangiogenic compound,dabigatran etexilate(DE),*** net charge inside the micelles is switchable when exposed to different pH conditions,thereby leading to revisable size-change of ***-loaded micelles(DE@cPCM)can swell and release drugs at the tumor sites with a mildly acidic pH,while they shrink and protect the cargo from leaking into the blood circulation with a neutral *** indicated that DE@cPCM can inhibit tumor angiogenesis in vitro and in vivo,thereby efficiently restraining tumor growth in a 4T1-bearing mouse ***,the sizeswitchable cPCM is a promising nanoplatform for targeting delivery of anticarcinogens into the matrix of tumor tissues.

关键词： Polyion complex micelle Size-switchable Revisable size-change pH response Antiangiogenic cancer

Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state Ni for sodium storage with high-power density

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第4期171卷 16-23页

作者： Zhijia Zhang Gang Xie Yuefang Chen Yanhao Wei Mengmeng Zhang Shulei Chou Yunxiao wang yifang Zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Carbon nanofibers(CNFs)with high specific surface area show great potential for sodium storage as a hard carbon ***,CNFs anchored with Ni nanoparticles(CNFs/Ni)were prepared through chemical vapor deposition and impregnation reduction methods,in situ growing on the three-dimensional porous copper current collector(3DP-Cu).The coupling effect of high-spin state Ni nanopar-ticles leads to the increase of defect density and the expansion of lattice spacing of ***,the 3DP-Cu ensures a high loading capacity of CNFs and short ion/electron transport *** an integral binder-free anode,the 3DP-Cu/CNFs/Ni exhibits excellent electrochemical performance,which demon-strates a high specific capacity with 298.5 mAh g^(-1)at 1000 mA g^(-1)after 1500 cycles,and a high power density with 200 mAh g^(-1)over 1000 cycles at 5000 mA g^(-1).Density functional theory calculation re-sults show that the high-spin state Ni regulates the electronic structure of CNFs,which significantly reduces the adsorption energy for Na^(+)(-2.7 Ev)and thus enables high-rate *** regulation of the electronic structure of carbon materials by high-spin state metal provides a new strategy for developing high-power carbonaceous anode materials for sodium-ion batteries.

关键词： Carbon nanofibers Ni nanoparticles High-spin state Sodium-ion batteries Anode materials Density functional theory calculation

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

以基础研究和大科学设施助推新质生产力发展

科技导报 2024年第12期42卷 1-2页

作者：王贻芳中国科学院高能物理研究所北京100049

基础研究是一切科技活动的基础,也是经济和技术发展的根基。没有基础科学的成果,就没有当今高度发达、富裕、强盛的现代生活。基础科学的重大突破,如牛顿力学、电磁学、热力学、相对论、量子力学等,奠定了工业革命、能源革命和信息革命... 详细信息

基础研究是一切科技活动的基础,也是经济和技术发展的根基。没有基础科学的成果,就没有当今高度发达、富裕、强盛的现代生活。基础科学的重大突破,如牛顿力学、电磁学、热力学、相对论、量子力学等,奠定了工业革命、能源革命和信息革命的基础,我们耳熟能详的现代机械、航空航天、电力电子、半导体与通信等现代工业体系均奠基在基础科学的知识与规律之上,是能够做到“知其然并知其所以然”“举一反三”的缘由。面对未来,为实现“从0到1”的创新与跨越,建设创新型的科技强国,应该且必须全面掌握人类已有的知识体系,并积极参与新知识和新规律的“生产”,为人类文明做出与中华民族的灿烂历史与人口规模相匹配的成就与贡献。

关键词：现代工业体系能源革命科技强国举一反三基础科学现代机械航空航天牛顿力学