检索结果-南通市图书馆

Effect of Postoperativeω-3 Fatty Acid Immunonutritional Therapy on NK Cell Gene Methylation in Elderly Patients with Gastric Cancer

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

Current Medical Science 2022年第2期42卷 373-378页

作者： li-ning xu Ying-ying xu Gui-ping li Bo YANG Department of General Surgery The Second Medical Center&National Clinical Research Center for Geriatric DiseasesChinese PLA General HospitalBeijing100853China Department of Internal Medicine Henan Cancer HospitalZhengzhou450003China Department of Radiology Hubei Province Integrated Hospital of Chinese and Western MedicineWuhan430015China Department of Radiology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China

Objective This study aims to investigate the effect ofω-3 fatty acid immunonutritional therapy on natural killer(NK)cell gene methylation and function in elderly patients with gastric *** A total of 70 cases of elderly patients with gastric cancer were randomized into theω-3 fatty acid group and placebo group,according to the type of nutritional support *** methylation status of the tumor necrosis factor(TNF)-αgene promoter in peripheral NK cells was detected by methylation specific polymerase chain reaction,and the TNF-αlevel in peripheral NK cells was detected by enzyme-linked immunosorbent *** After 14 days of immunonutritional therapy withω-3 fatty acid or placebo,patients in theω-3 group had significantly higher average NK cell activity(0.27 vs.0.24,P=0.013)and lower percentages of TNF-αgene promoter methylation(25.7%vs.60%,Plication ofω-3 fatty acid may improve the activity of NK cells,which is correlated to the methylation status of the TNF-αgene promoter.

关键词： perioperative gastric carcinoma natural killer cell DNA methylation immune nutrition

Binary ligand strategy toward interweaved encapsulation-nanotubes structured electrocatalyst for proton exchange membrane fuel cell

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

Journal of Energy Chemistry 2022年第1期31卷 129-135,I0005页

作者： Qingbin liu li xu Shizhen liu Zhonghua Xiang State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Petrochemical Research Institute PetroChina Company LimitedBlock 42.CNPC Innovation BaseChangping District.Beijing 102206.China

Hierarchically porous architecture of ir on-nitroge n-carb on(Fe-N-C)for oxyge n reducti on reaction(ORR)is highly desired towards efficient mass transfer in the fuel cell device ***,we reported a binary ligand strategy to prepare zeolitic imidazolate frameworks(ZIFs)-derived precursors,wherein the addition of secondary ligand endows precursors with the capabilities to transform into porously interweaved encapsulation-nanotubes structured composites after *** optimal catalyst,i.e.,termed as Fe_(6)-M/C-3,exhibits excellent durability with 88.8%current retention after 50,000 seconds in 0.1 M HClO_(4)solution by virtue of nanoparticles-encapsulation features,which is more positive than the benchmark commercial 20 wt%Pt/C ***,a promising maximum power density of Fe_(6)-M/C-3 as cathode catalyst was also dem on strated in proton exchange membrane fuel cells(PEMFCs)***,this binary ligand approach to the fabrication of hierarchically porous structures would also have significant implications for various other electrochemical reactions.

关键词： Oxygen reduction reaction Binary ligand strategy Interweaved encapsulation-nanotubes architecture Proton exchange membrane fuel cells

A linkable signature scheme supporting batch verification for privacy protection in crowd-sensing

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2024年第3期10卷 645-654页

作者： xu li Gwanggil Jeon Wenshuo Wang Jindong Zhao School of Computer and Control Engineering Yantai UniversityYantai264005China Department of Embedded Systems Engineering Incheon National UniversityAcademyro-119Incheon22012Republic of Korea

The maturity of 5G technology has enabled crowd-sensing services to collect multimedia data over wireless network,so it has promoted the applications of crowd-sensing services in different fields,but also brings more privacy security challenges,the most commom which is privacy *** a privacy protection technology combining data integrity check and identity anonymity,ring signature is widely used in the field of privacy ***,introducing signature technology leads to additional signature verification *** the scenario of crowd-sensing,the existing signature schemes have low efficiency in multi-signature ***,it is necessary to design an efficient multi-signature verification scheme while ensuring *** this paper,a batch-verifiable signature scheme is proposed based on the crowd-sensing background,which supports the sensing platform to verify the uploaded multiple signature data efficiently,so as to overcoming the defects of the traditional signature scheme in multi-signature *** our proposal,a method for linking homologous data was presented,which was valuable for incentive mechanism and data *** results showed that the proposed scheme has good performance in terms of security and efficiency in crowd-sensing applications with a large number of users and data.

关键词： 5G network Crowd-sensing Privacy protection Ring signature Batch verification

On hp refinements of independent cover numerical manifold method——some strategies and observations

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第5期66卷 1335-1351页

作者： ZHANG Ning ZHENG Hong li xu WU WenAn School of Civil Engineering Qinghai UniversityQinghai810016China Key Laboratory of Urban Security and Disaster Engineering Ministry of EducationBeijing University of TechnologyBeijing100081China Key Laboratory of Urban Underground Engineering of Ministry of Education Beijing Jiaotong UniversityBeijing100091China

In this paper,strategies are provided for a powerful numerical manifold method(NMM)with h and p refinement in analyses of elasticity and *** new NMM is based on the concept of the independent cover,which gets rid of NMM's important defect of rank deficiency when using higher-order local approximation *** techniques are *** terms of mesh generation,a relationship between the quadtree structure and the mathematical mesh is established to allow a robust *** to the condition number,a scaling based on the physical patch is much better than the classical scaling based on the mathematical patch;an overlapping width of 1%–10%can ensure a good condition number for 2nd,3rd,and 4th order local approximation functions;the small element issue can be overcome after the local approximation on small patch is replaced by that on a regular *** numerical accuracy,local approximation using complete polynomials is necessary for the optimal convergence *** issues that may damage the convergence rate should be *** first is to approximate the curved boundary of a higher-order element by overly few straight lines,and the second is excessive overlapping ***,several refinement strategies are verified by numerical examples.

关键词： independent cover numerical manifold method hp refinement partition of unity higher order element condition number

PLC Protection System Based on Verification Separation

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第5期71卷 2401-2417页

作者： Xiaojun Pan Haiying li Xiaoyi li li xu Yanbin Sun Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhou510000China School of Science and Engineering Laval UniversityQuebecG1V0A6Canada

Supervisory control and data acquisition systems(SCADAs)play an important role in supervising and controlling industrial production with the help of programmable logic controllers(PLCs)in industrial control systems(ICSs).A PLC receives the control information or program from a SCADA to control the production equipment and feeds the production data back to the *** a SCADA is controlled by an attacker,it may threaten the safety of industrial *** lack of security protection,such as identity authentication and encryption for industrial control protocols,increases the potential security *** this paper,we propose a PLC protection system combined with a monitor between a SCADA and a PLC and a physically separated monitoring *** using the PLC protection system,identity verification and command verification are separated,and both the identity of the operator and the corresponding commands are *** show that even if the SCADA is controlled by an attacker,our system could still protect the PLC in the field and record the identity of the key command operator,which facilitates the tracing and forensics of malicious activities.

关键词： ICS SCADA PLC security

Some results on the algebraic immunity of Boolean functions

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

The Journal of China Universities of Posts and Telecommunications 2011年第2期18卷 102-105页

作者： xu li-qing CHEN hao Software Engineering Institute East Normal University Shanghai 200062 China

From the motivation of algebraic attacks on stream and block ciphers,the concept of algebraic immunity（AI） of a Boolean function was introduced and studied *** algebraic immunity is a necessary condition for resisting algebraic *** this paper,we give some lower bounds on the algebraic immunity of Boolean *** results are applied to give lower bounds on the AI of symmetric Boolean functions and rotation symmetric Boolean *** balanced rotation symmetric Boolean functions with their AI near the maximum possible value「n/2」are constructed.

关键词： algebraic attack Boolean function AI symmetric Boolean function rotation symmetric Boolean function

5,7,2',4',5'-Pentamethoxyflavanone regulates M1/M2 macrophage phenotype and protects the septic mice

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2019年第5期17卷 363-371页

作者： FENG li-li xu li-Sha GUO Meng-Meng HUANG Wei ZHU Jia-Zhen KONG ling-Dong WU xu-Dong xu Qiang State Key Laboratory of Pharmaceutical Biotechnology School of Life Sciences Nanjing University

Flavonoids have been reported to exert protective effect against many inflammatory diseases, while the underlying cellular mechanisms are still not completely known. In the present study, we explored the anti-inflammation activity of 5, 7, 2', 4', 5'-pentamethoxyflavanone(abbreviated as Pen.), a kind of polymethoxylated flavonoid, both in vitro and in vivo experiments. Pen. was showed no obvious toxicity in macrophages even at high dosage treatment. Our results indicated that Pen. significantly inhibited both mR NA and protein level of proinflammatory cytokines, IL-1β, IL-6, TNF-α and iN OS, which was characteristic expressed on M1 polarized macrophages. These effects of Pen. were further confirmed by diminished expression of CD11c, the M1 macrophage surface marker. Further researches showed that the mechanism was due to that Pen. downregulated the activity of p65, key transcription factor for M1 polarization. On the other hand, Pen. also enhanced M2 polarization with upregulation of anti-inflammatory factors and increase of M2 macrophage surface markers, which lead to the balance of M1 and M2 macrophages. Moreover, in vivo research verified that Pen. treatment alleviated LPS-induced sepsis in mice by increasing survival rate, decreasing inflammatory cytokines and improving lung tissue damage. In summary, our results suggested that Pen. modulated macrophage phenotype via suppressing p65 signal pathway to exert the anti-inflammation activity.

关键词： Macrophage polarization Anti-inflammation NFκB Sepsis 5,7,2',4',5'-Pentamethoxyflavanone(Pen.)

A Conjugated Copolymer Bearing Imidazolium-based Ionic liquid:Electrochemical Synthesis and Electrochromic Properties

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第5期39卷 537-544,I0005页

作者： Xiao-Jing Lv li-Bin xu liang Qian Yuan-Yuan Yang Zhi-Yi xu Jin li Cheng Zhang International Sci.&Tech.Cooperation Base of Energy Materials and Application College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014China

An imidazolium-based ionic liquid(IL)modified triphenylamine derivative,namely 1-(4-((4-(diphenylamino)benzoyl)oxy)butyl)-3-methyl imidazole tetrafluoroborate(TPAC_(6)IL-BF_(4)),was designed and synthesized,and further applied with 3,4-ethylene dioxythiophene(EDOT)to prepare conjugated copolymer P(EDOT:TPAC_(6)IL-BF_(4)) via electrochemical *** cyclic voltammetry curves show that the copolymer P(EDOT:TPAC_(6)IL-BF_(4))possesses two pairs of redox peaks,which should be ascribed to the redox behaviors of EDOT and *** ultraviolet-visible(UV-Vis)absorption spectrum of P(EDOT:TPAC_(6)IL-BF_(4))exhibits one maximum absorption peak at 580 nm and a small shoulder characteristic peak at 385 nm under neutral state which are assigned toπ-π^(*)conjugated structure of EDOT and *** being applied at the positive voltage,the copolymer color changes from dark blue to light blue,which is close to the color of poly(3,4-ethylenedioxythiophene)(PEDOT).Surprisingly,the copolymer P(EDOT:TPAC_(6)IL-BF_(4))shows shorter switching time of 0.37 s,0.30 s at 580 nm and 0.38 s,0.45 s at 1100 nm compared with *** is more intriguing that the copolymer P(EDOT:TPAC_(6)IL-BF_(4))exhibits electrochromism even in free supporting *** results confirm that the existence of imidazolium-based ionic liquid has an improvement on the ion diffusion properties and the switching time of conjugated polymer,which may provide a potential direction for the preparation of high-performance electrochromic materials.

关键词： Electrochromism Copolymer lonic liquid Electropolymerization Fast switching

New cubic rational basis with tension shape parameters

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2015年第3期30卷 273-298页

作者： ZHU Yuan-peng HAN xu-li School of Mathematical Sciences University of Science and Technology of China School of Mathematics and Statistics Central South University

By using the blossom approach, we construct four new cubic rational Bernsteinlike basis functions with two shape parameters, which form a normalized B-basis and include the cubic Bernstein basis and the cubic Said-Ball basis as special cases. Based on the new basis, we propose a class of C2 continuous cubic rational B-spline-like basis functions with two local shape parameters, which includes the cubic non-uniform B-spline basis as a special *** totally positive property is proved. In addition, we extend the cubic rational Bernsteinlike basis to a triangular domain which has three shape parameters and includes the cubic triangular Bernstein-B′ezier basis and the cubic triangular Said-Ball basis as special cases. The G1 continuous conditions are deduced for the joining of two patches. The shape parameters in the bases serve as tension parameters and play a foreseeable adjusting role on generating curves and patches.

关键词： Bernstein basis Said-Ball basis tension shape parameter totally positive property B-spline basis Bernstein-Bezier basis