检索结果-南通市图书馆

Journal of Materials Science & Technology 2023年第24期155卷 132-141页

作者： tian Wang Zhiliang jin School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyKey Laboratory for Chemical Engineering and TechnologyState Ethnic Affairs CommissionNorth Minzu UniversityYinchuan 750021China

The photocatalytic performance can be significantly improved by constructing suitable heterojunction *** is well known that graphdiyne possesses a unique conjugated carbon network nanostructure,which gives it ample active sites on its surface and facilitates the reduction of *** this study,a unique new double S-scheme heterojunction photocatalyst was constructed by simple self-assembly of GDY prepared via organic synthesis methods and *** to the study,an internal electric field controlling the transfer direction of the electron hole is formed between the interface of CuI-GDY and ZnAl-LDH,which broadens the light absorption range of the catalyst and improves the redox ability of the photocatalytic ***-GDY and ZnAl-LDH are tightly bound together,which helps to separate the photogenerated carriers while preserving the strong reduction electrons in the GDY conduction band and the strong oxidation holes in the ZnAl-LDH valence band so that they can fully participate in the redox *** charge-transfer paths on the S-scheme heterojunction interface were analyzed by in situ irradiation *** work provides an effective strategy for the construction of double S-scheme heterojunction photocatalysts.

关键词： Conjugated carbon network Graphdiyne S-scheme heterojunction Hydrogen evolution

A novel subsidence monitoring technique based on space-surface bistatic differential interferometry using GNSS as transmitters

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(Information Sciences) 2015年第6期58卷 68-83页

作者： ZENG tao ZHANG tian tian WeiMing HU Cheng Beijing Key Laboratory of Embedded Real-time Information Processing Technology Radar Research Laboratory School of Information and ElectronicsBeijing Institute of Technology

Synthetic Aperture Radar Differential Interferometry(DIn SAR) technique is an effective tool with large coverage and high spatial accuracy for subsidence monitoring. Nevertheless, the temporal resolution is usually poor so that rapid deformation cannot be measured due to the long revisit time of radar *** SAR Differential Interferometry technique using Global Navigation Satellite System(GNSS) as illuminator has a shorter revisit time, whereas the measurement accuracy is constrained by low signal power, narrow bandwidth and atmospheric delay error. To cope with these problems, in this paper, we propose a novel subsidence monitoring technique based on Space-Surface bistatic Differential Interferometry(SS-DI) with GNSS transmitters, where two stations consist of a reference one and a measurement one that are deployed on the ground. First, we applied a space differential processing between two stations to cancel identical errors such as tropospheric and ionospheric errors etc. Then we used a long time coherent integration to improve the signal noise ratio. Subsequently, we also utilized a time differential processing to construct double differential equations with respect to unknown deformation variables. Finally, we solved the equations to obtain a highly accurate estimation of three dimension deformation. Furthermore, an SS-DI experiment using Beidou-2 as transmitters was carried out to validate the proposed method, where a high accuracy(0.01 mm) device was utilized to simulate subsidence deformation. The experimental results reveal that the proposed method has better performance of spatial measurement accuracy of 0.53 mm compared with differential GPS method.

关键词： differential interferometry subsidence monitoring Beidou-2/Compass-2 space-surface bistatic radar differential GPS

A Coding Scheme for Noisy Image Based on Layer Segmentation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2016年第4期25卷 700-705页

作者： LI tao tian Xin XIONG Chengyi tian jinwen Nanjing Research Institute of Electronics Technology Wuhan University South–Central University for Nationalities Huazhong University of Science and Technology

Heavy noises distribute in the images when imaging in a poor *** randomness of noises makes pixels distributing singularly,which weakens the1-D piecewise smooth property of original ***,wavelets-based compression method no longer works *** this paper,a layer segmentation based compression scheme is proposed for gray *** textures and some high frequency noises are described in a high frequency layer while the coarse part of the image is described in the low frequency *** high frequency layer is represented by a joint dictionary,and the low frequency layer is coded with the traditional *** proposed scheme is tested on nature images and synthetic *** results show that the proposed scheme achieves better rate-distortion performance compared with several competing compression ***,further degradation of edges is avoided by the proposed compression scheme.

关键词： Image coding Noisy image model Sparse representation Edge detection

Pulp health and calcific healing of a complicated crown–root fracture with additional root fracture in a maxillary incisor: A case report

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第3期13卷 42-49页

作者： Na Li Yue-Yue Ren Ying Tang Qi Yang tian-tian Meng Song Li jing Zhang Stomatological Hospital and College Anhui Medical UniversityHefei 230032Anhui ProvinceChina Department of Endodontics The Affiliated Stomatological Hospital of Xuzhou Medical UniversityXuzhou 221000Jiangsu ProvinceChina

BACKGROUND Complicated crown–root fracture (CRF) involves severe injury to the crown, root,and pulp, and may be accompanied by multiple root fractures. The loss of a toothhas lifelong consequences for children and teenagers, but the maintenance of pulphealth and the calcific healing of multiple root fractures are rarely reported in *** SUMMARY This case reports healing of a permanent tooth with complicated crown–root andadditional root fractures, in which pulp health was maintained. A 10-year-old girlfell and fractured the root of her maxillary left central incisor at the cervical *** the coronal fragment was repositioned, the tooth was splinted until thetooth was no longer mobile, 2 years later. Eight years after treatment, the toothhas remained asymptomatic with vital pulp and localized gingival ***-beam computed tomography revealed not only calcified healing of the CRFbut also spontaneous healing in an additional undiagnosed root fracture. Thefracture line on the enamel could not be healed by hard tissue and formed agroove in the cervical crown. It was speculated that the groove was related to thelocalized gingival *** This case provides a clinical perspective of the treatment of a tooth with acomplicated CRF and an additional root fracture.

关键词： Complicated crown-root fracture Multiple root fracture Spontaneous healing Cone-beam computed tomography Long-term follow-up Case report

A short non-delegatable strong designated verifier signature

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

Frontiers of Computer Science 2014年第3期8卷 490-502页

作者： Haibo tian jin LI School of Information Science and Technology Sun Yat-Sen University Guangzhou 510275 China School of Computer Science Guangzhou University Guangzhou 510006 China

A non-delegatable strong designated verifier signature （NSDVS） enforces verification of a signature by a designated verifier only. The concept is useful in various commercial cryptographic applications such as copyright protection, e-voting, and e-libraries. This paper reports the shortest NSDVS so far that consists of only two elements. The scheme is inspired by an identification scheme and Cramer et al.＇s OR-proof technique where a prover can prove that he knows at least one out two secrets. It is solidified by a symmetric key based group to group encryption algorithm. Two implementations of the algorithm are reported. The scheme is provably secure with respect to its properties of unforgeability, non-transferability, privacy of signer＇s identity, and non-delegatability.

关键词： designated verifier signature non-delegatability symmetric encryption

Analysis of a Critical Residue Determining Herbicide Efficiency Sensitivity in Carboxyltransferase Domain of Acetyl-CoA Carboxylase from Poaceae by Homology Modeling and Free Energy Simulation

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

Chemical Research in Chinese Universities 2010年第5期26卷 816-821页

作者： tao jin ZHAO Bo tian Xue-mei ZHENG Liang-yu CAO Shu-gui Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education Jilin University Changchun 130021 P. R. China

Carboxyltransferase domain（CT） of acetyl-coenzyme A carboxylase（ACCase, EC 6.***.1.2） from a family of Poaceae is an important target of commercial herbicide APPs for controlling grass weed growth. As the abuse of APPs herbicides, the resistant ACCase due to the mutation of a single residue（Ile→Leu）, which is located in CT active site, is emergent in many populations and species of Poaceae. So it is urgent to understand the resistant mechanism so as to design new effect herbicides. Herein lies the complex of CT dimmer from Lolium rigidum and herbicide haloxyfop successfully constructed for wild type enzyme and Ile/Leu mutant, respectively, providing a basis for explaining the resistance from microscopic structure. Moreover, the binding free energy difference between wild type and mutant enzymes was predicted in good agreement with the known observation, and the various contributions to it were analyzed, by Molecular mechanics-Poisson-Boltzmann surface area（MM-PBSA） method. The results indicate the van der Waals interaction difference between the protein and inhibitor, -22.94 kJ/mol of CT wild type lower than that of mutant, is the major reason for resistance. Structure analysis further suggests that van der Waals interaction difference is originated from the steric hindrance between the side chain of mutated residue Leu and the chiral methyl group of haloxyfop. All these findings enhance the understanding of resistant mechanism of ACCase to herbicide by Ile/Leu mutation and provide an important clue for the rational design of high effective herbicides.

关键词： Molecular modeling Molecular dynamics Free energy calculation Herbicide resistance

长三角区域新质生产力发展水平、区域差异与时空演变特征

在线全文

学校读者我要写书评

暂无评论

经济问题 2025年第1期 113-123页

作者：阮素梅邵恬恬安徽财经大学金融学院安徽蚌埠233000

发展新质生产力,是进一步全面深化改革和推进中国式现代化的必然要求。以长三角“一市三省”为研究对象,基于2010—2023年的面板数据,对长三角区域省(市)新质生产力发展水平、变化趋势以及区域差异等进行了测度与分析。研究发现:第一,... 详细信息

发展新质生产力,是进一步全面深化改革和推进中国式现代化的必然要求。以长三角“一市三省”为研究对象,基于2010—2023年的面板数据,对长三角区域省(市)新质生产力发展水平、变化趋势以及区域差异等进行了测度与分析。研究发现:第一,长三角区域新质生产力发展水平整体呈上升趋势,但区域差异较大,地区间发展不平衡现象明显。第二,新质劳动资料对长三角区域新质生产力的贡献最为突出,其次是新质劳动者和新质劳动对象;上海市新质劳动对象的贡献最高,江苏省新质劳动者的贡献占比较大,浙江省新质劳动资料的贡献则更加突出,而安徽省虽没有突出优势,但其新质生产力增长率最高。第三,长三角区域新质生产力发展水平呈极化现象,且江苏省、浙江省、安徽省内部存在新质生产力发展水平较高的城市,省内发展不均衡;从时空动态演进特征看,长三角区域新质生产力不存在“跨越式”发展,但存在“俱乐部收敛”现象。该研究能够为实现长三角区域协同发展,尤其为培育和实现安徽省新质生产力和经济高质量发展提供实践依据和经验借鉴。

关键词：新质生产力长三角区域时空动态演进

Quantum corrections to the entropy in a driven quantum Brownian motion model

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2021年第9期73卷 136-144页

作者： tian Qiu Hai-tao Quan School of Physics Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Frontiers Science Center for Nano-optoelectronics Peking UniversityBeijing100871China

The quantum Brownian motion model is a typical model in the study of nonequilibrium quantum *** is one of the most fundamental physical concepts in *** this work,by solving the quantum Langevin equation,we study the von Neumann entropy of a particle undergoing quantum Brownian *** obtain the analytical expression of the time evolution of the Wigner function in terms of the initial Wigner *** result is applied to the thermodynamic equilibrium initial state,which reproduces its classical counterpart in the high temperature *** on these results,for those initial states having well-defined classical counterparts,we obtain the explicit expression of the quantum corrections to the entropy in the weak coupling ***,we find that for the thermodynamic equilibrium initial state,all terms odd inÿ are exactly *** results bring important insights to the understanding of entropy in open quantum systems.

关键词： quantum Brownian motion time-dependent evolution quantum entropy

Efficacy of phospholipid complex of flavonoids from persimmon leaves on atherosclerosis, and possible mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2022年第3期42卷 417-425页

作者： CHEN jinpeng ZHANG Kexia LIU Yi jin Song GAI Xiaohong REN tao tian Chengwang State Key Laboratory of Drug Delivery and Pharmacokinetics Tianjin 300301China tianjin Key Laboratory of TCM quality markers Tianjin 300301China tianjin Institute of Pharmaceutical Research Tianjin 300301China tianjin Pharmaceutial Research Institute Co.Ltd. Tianjin 300462China Sinopharm Group tianjin Co.Ltd. Tianjin 300040China

OBJECTIVE:To investigate the efficacy of phospholipid complex of flavonoids from persimmon leaves(PLF-PC)on atherosclerosis,and to study its mechanism behind the ***:To clarify the constituents of the flavonoids from persimmon leaves(PLF),an ultra-performance liquid chromatography/quadrupole-time-of-flight mass spectrometry method was *** enhance the anti-atherosclerotic effect of PLF,a newly emerging approach based on the combination of phospholipid complexation technique was ***-PC was prepared by the solvent-evaporation method then characterized using Fourier transform infrared spectroscopy,Powder X-Ray Diffractometry and Scanning electron microscopy.A model of oxidized lowdensity lipoprotein-induced injury on human umbilical vein endothelial cells was established to investigate the anti-atherosclerotic effect of PLF-PC versus *** levels of nitric oxide,endothelial nitric oxide synthase,intracellular adhesion molecule-1,reactive oxygen species,superoxide dismutase,tumor necrosis factor-αand nuclear factor-κB were observed via assay ***:A total of 31 compounds were identified in ***-PC showed better anti-atherosclerotic power compared with PLF,moreover,enzyme linked immuneosorbent assay analysis showed that the PLF-PC may effect on endothelial dysfunction and atherosclerosis via antioxidant-related ***:Our findings elucidated that PLF-PC significantly enhanced the PLF’s efficacy on atherosclerosis.

关键词： flavonoids chromatography,high pressure liquid mass spectrometry phospholipids lipoproteins,LDL endothelial cells

Multivariate synergy for heightening ionic HOF robustness and proton conductivity

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Xiang-tian Bai Li-Hui Cao Xu-Yong Chen Jia-Yu Wang Zi-Ye Zhou Shaanxi Key Laboratory of Chemical Additives for Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and Technology

Multicomponent crystalline materials construct more complex and diversified structures with different combinations and modes,which expands the material structure space and application *** this work,we have successfully synthesized two twocomponent ionic hydrogen-bonded organic frameworks （iHOF-32 and iHOF-33） and a three-component iHOF （iHOF-34）.Guanidine hydrochloride which is rich in N and H and has a short chain length strengthens the hydrogen bonding network of iHOF,thereby aiding in the efficient migration of *** rigid architecture of 1,1'-diamino-4,4'-bipyridine diiodide furnishes additional scaffolding for the iHOFs and enhances its robustness under harsh ***-34 accomplishes the combination of the ultra-high proton conductivity of iHOF-32 and the robustness of iHOF-33 by the synergistic interaction among the three components of *** addition,iHOF-34 was fabricated as a composite membrane with a peak proton conductivity of 1.55×10-1S cm-1,which is 3.8 times higher than that of recast Nafion,and has extensive potential in fuel *** self-assembly strategy of multicomponent HOFs opens up new avenues for constructing diverse structures while promising new opportunities for applications in the fields of proton conduction and energy storage.

关键词：