检索结果-南通市图书馆

Image Magnification Method Using Joint Diffusion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2004年第5期19卷 698-707页

作者： zhong-XuanLiu hong-JianWang Si-LongPeng InstituteofAutomation TheChineseAcademyofSciencesBeijing100080P.R.China

In this paper a new algorithm for image magnification is presented. Because linear magnification/interpolation techniques diminish the contrast and produce sawtooth effects, in recent years, many nonlinear interpolation methods, especially nonlinear diffusion based approaches, have been proposed to solve these problems. Two recently proposed techniques for interpolation by diffusion, forward and backward diffusion (FAB) and level-set reconstruction (LSR), cannot enhance the contrast and smooth edges simultaneously. In this article, a novel Partial Differential Equations (PDE) based approach is presented. The contributions of the paper include: firstly, a unified form of diffusion joining FAB and LSR is constructed to have all of their virtues; secondly, to eliminate artifacts of the joint diffusion, soft constraint takes the place of hard constraint presented by LSR; thirdly, the determination of joint coefficients, criterion for stopping time and color image processing are also discussed. The results demonstrate that the method is visually and quantitatively better than Bicubic, FAB and LSR.

关键词： image magnification nonlinear diffusion joint diffusion forward-and-backward diffusion level-set reconstruction

An investigation of oxygen pressure acid leaching of Gacun complex Cu-Pb bulk concentrate

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

Rare Metals 2012年第1期31卷 96-101页

作者： Xu, Bin zhong, hong Jiang, Tao School of Resources Processing and Bioengineering Central South UniversityChangsha 410083China Sichuan Xinyuan Mining Limited liability Company Chengdu 610000China School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

The treatment of the Gacun complex Cu-Pb bulk concentrate with high Zn,Ag,etc.,by oxygen pressure acid leaching was *** pri-mary copper and leadminerals in the concentrate are tetrahedrite and *** treatment of tetrahedrite was rarely studied,and most of silver occurred in themineral *** optimum operating parameters of oxygen pressure acid leaching were established by conditional *** these parameters,the result of pilot scale test showed that the leaching percentages of copper and zinc were separately as high as 98.9 wt.% and 94.9 wt.%,while lead and silver were transformed into sulfate and sulfide precipitations,*** copper and zinc in lixivium were reclaimed by extraction-electrowinning and purification-electrowinning,respectively,and the lead and silver in the residue were reclaimed separately by carbonate transformation-silicofluoric acid leaching and thiourea leaching.

关键词： nonferrous metallurgy synthetic reclaiming oxygen pressure acid leaching complex Cu-Pb bulk concentrate tetrahedrite

Electro-oxidation process and mechanism of molybdenite decomposition under ultrasonic effect

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2008年第6期27卷 566-570页

作者： JIA Lijuan zhong hong FU Jiangang College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

According to the characteristics and shortcomings of the traditional roasting process and the electro-oxidation process in the molybdenum metallurgical industry, the ultrasound electro-oxidation process was proposed to strengthen the oxidative decomposition or leaching of molybdenum. Laboratory work was carried out in an electrochemical cell with 15 mm electrode spacing at 25℃ under ultrasonic effect. The optimum conditions were found through experiments. The electro-oxidation mechanism of molybdenite decomposition under ultrasonic was investigated. A model of electro-oxidation mechanism of molybdenum under ultrasonic was given.

关键词： chemical metallurgy molybdenite leaching electron-oxidation ultrasonic

IBEET-AOK:ID-based encryption with equality test against off-line KGAs for cloud medical services

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2021年第6期15卷 187-189页

作者： Yan XU Ming WANG hong zhong Sheng zhong School of Computer Science and Technology Anhui UniversityHefei 230601China State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China

1 Introduction With the rapid development of cloud computing,more and more data are stored in cloud servers as cyphertexts for storage[1,2].However,it faces enormous challenges regarding ciphertext *** example,in the cloud medical services,authorized medical institutions(AMIs)need analyze medical records to figure out gender and age information on patients with the same disease.

关键词： services cloud analysis.

Adjuvant therapy for hepatocellular carcinoma:Dilemmas at the start of a new era

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第8期30卷 806-810页

作者： Jian-hong zhong Department of Hepatobiliary Surgery Guangxi Medical University Cancer HospitalNanning 530021Guangxi Zhuang Autonomous RegionChina

Approximately 50%-70%of patients with hepatocellular carcinoma experience recurrence within five years after curative hepatic resection or *** a result,many patients receive adjuvant therapy after curative resection or ablation in order to prolong recurrence-free *** therapy recommended by national guidelines can differ,and guidelines do not specify when to initiate adjuvant therapy or how long to continue *** and other unanswered questions around adjuvant therapies make it difficult to optimize them and determine which may be more appropriate for a given type of *** questions need to be addressed by clinicians and researchers.

关键词： Adjuvant therapy Hepatocellular carcinoma Tumor recurrence Unanswered questions

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 Sinica,English Series 2007年第8期23卷 1405-1412页

作者： Lian zhong YANG hong Xun YI School of Mathematics & Systems Science Shandong University Ji'nan 250100 P. R. China

In this paper, we prove several results concerning meromorphic functions f and g of hyperorder less than one such that f^（j） and g^（j） have the same zeros and poles for j=0, 1, 2. We provide some examples to show ... 详细信息

关键词： meromorphic functions uniqueness sharing values

Area-based mobile multicast group key management scheme for secure mobile cooperative sensing

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2017年第9期60卷 286-292页

作者： Jie CUI hong zhong Weiya LUO Jing ZHANG School of Computer Science and Technology Anhui University

In this study,we propose a novel key management model for localized mobile groups that employ *** service provisions will not be interrupted while users move among different wireless network areas,while each network provides the respective multicast services *** the mobile users in a given area form a cluster managed by an area key distributor(AKD)[1],and the AKD takes charge of the distribution of a key and updates the clusters *** our

关键词： LKH AKD Area-based mobile multicast group key management scheme for secure mobile cooperative sensing node

Efficient Conditional Privacy-Preserving and Authentication Scheme for Secure Service Provision in VANET

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2016年第6期21卷 620-629页

作者： hong zhong Jingyu Wen Jie Cui Shun Zhang School of Computer Science and Technology Anhui University

Vehicle Ad hoc NETworks（VANET） can enhance traffic safety and improve traffic efficiency through cooperative communication among vehicles, roadside infrastructure, and traffic management centers. To guarantee secure service provision in VANET, message authentication is important. Moreover, a vehicle user＇s private information can also be leaked during service provision. A protection mechanism is needed to prevent such leakage. Therefore, we propose a conditional privacy-preserving and authentication scheme for secure service provision in VANETs. The proposed scheme not only satisfies the security requirements of VANETs, but also optimizes the calculation process of signature generation and verification. We carry out a detailed comparative analysis. The result shows that the proposed scheme is more efficient than existing schemes in terms of communication overhead and computational cost. Therefore, our scheme is suitable for secure service provision in VANETs.

关键词： VANET message authentication batch verification privacy-preserve elliptic curve

Protein-modified SEI formation and evolution in Li metal batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第10期31卷 248-258,I0006页

作者： Chenxu Wang Ryan Odstrcil Jin Liu Wei-hong zhong School of Mechanical and Materials Engineering Washington State UniversityPullmanWA 99164USA

Despite numerous reported lithium metal batteries(LMBs) with excellent cycling performance achieved in labs, transferring the high performing LMBs from lab-scale to industrial-production remains challenging. Therefore, via imitating the stand-still process in battery production, a conventional but important procedure, to investigate the formation and evolution of a solid electrolyte interface(SEI) is particularly important for LMBs. Our previous studies indicate that zein(corn protein)-modified carbonate-ester electrolyte(the most commercialized) effectively improves the performance of LMBs through guiding Li-ions and repairing cracked SEI. Herein, we investigate the formation and evolution of the protein-modified SEIs on Li anodes by imitating the stand-still temperature and duration. A simulation study on the protein denaturation in the electrolyte under different temperatures demonstrates a highly unfolded configuration at elevated temperatures. The experiments show that this heat-treated-zein(H-zein) modified SEI forms quickly and becomes stable after a stand-still process of less than 100 min. Moreover, the Hzein SEI exhibits excellent wetting behavior with the electrolyte due to the highly unfolded protein structures with more functional groups exposed. The Li|Li cell with the H-zein SEI achieves prolonged cycling performance(>360 h vs. ~260 h of the cell with the untreated-zein(U-zein) modified SEI). The Li Fe PO_(4)|Li cell with the H-zein SEI shows much stable long-term cycling performance of capacity retention(70% vs.42% of the cell with U-zein SEI) after 200 cycles. This study confirms that the appropriately treated protein is able to effectively improve the performance of LMBs, and will inspire future studies for the production process of LMBs toward their commercialization.

关键词： Protein Zein Lithium metal Stand-still Battery SEI