检索结果-南通市图书馆

Ricci-flat Graphs with Girth Four

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2021年第11期37卷 1679-1691页

作者： wei Hua HE Jun luo Chao YANG wei yuan Hui Chun ZHANG School of Mathematics and Statistics Guangdong University of TechnologyGuangzhou 510520P.R.China School of Mathematics Sun Yat-sen UniversityGuangzhou 510275P.R.China School of Mathematics and Statistics Guangdong University of Foreign StudiesGuangzhou 510006P.R.China

Lin-Lu-Yau introduced a notion of Ricci curvature for graphs and obtained a complete classification for all Ricci-flat graphs with girth at least *** this paper,we characterize all Ricci-flat graphs of girth four with... 详细信息

关键词： Ricci curvature Ricci-flat graph vertex-disjoint

Osteopontin(OPN)alleviates the progression of osteoarthritis by promoting the anabolism of chondrocytes

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2023年第4期10卷 1714-1725页

作者： wei luo Zili Lin Yuhao yuan Ziyi Wu wei Zhong Qing Liu Department of Orthopaedics Xiangya HospitalCentral South UniversityChangshaHunan 410008China National Clinical Research Center for Geriatric Disorders Xiangya HospitalChangshaHunan 410008China

Osteoarthritis(OA)is a chronic debilitating joint disease,characterized by degen-eration of the cartilage and loss of the cartilage matrix,and it is clinically manifested as joint ***(OPN)is a glycoprotein that is abnormally expressed in the bone and carti-lage tissues and plays a vital role in various pathological processes such as the osteoarthritic inflammatory response and endochondral *** focus of our study is to investigate the therapeutic potential and specific role of OPN in *** morphological comparisons,we found that the cartilage was severely worn-out and there was a significant loss of the cartilage matrix in ***,CD44,and hyaluronic acid(HA)synthase 1(HAS1)were highly expressed,and the anabolism of HA was significantly higher in the OA chondrocytes than in the control ***,we treated the OA chondrocytes with small interfering RNA(siRNA)targeting OPN,recombinant human OPN(rhOPN),and a combination of rhOPN and anti-CD44 ***,in vivo experiments were performed in *** found that OPN up-regulated the expression of downstream HAS1 and increased the anabolism of HA through CD44 protein expression in OA mice compared with those in control ***,intra-articular injection of OPN in mice with OA significantly inhibited OA *** summary,OPN ini-tiates an intracellular cascade via CD44 which results in an anabolic increase in HA levels,thereby inhibiting OA ***,OPN is a promising therapeutic agent in precision treatment of OA.

关键词： Cartilage degeneration CD44 Hyaluronic acid Osteoarthritis Osteopontin

NUMERICAL SIMULATION AND EXPERIMENTAL STUDY OF DRAGREDUCING SURFACE OF A REAL SHARK SKIN

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 Hydrodynamics 2011年第2期23卷 204-211页

作者： ZHANG De-yuan luo Yue-hao LI Xiang CHEN Hua-wei School of Mechanical Engineering and Automation Beihang University Beijing 100191 China

It is well known that shark skin surface can effectively inhabit the occurrence of turbulence and reduce the wall friction, but in order to understand the mechanism of drag reduction, one has to solve the problem of the turbulent flow on grooved-scale surface, and in that respect, the direct numerical simulation is an important tool. In this article, based on the real biological shark skin, the model of real shark skin is built through high-accurate scanning and data processing. The turbulent flow on a real shark skin is comprehensively simulated, and based on the simulation, the drag reduction mechanism is discussed. In addition, in order to validate the drag-reducing effect of shark skin surface, actual experiments were carried out in water tunnel, and the experimental results are approximately consistent with the numerical simulation.

关键词： numerical simulation experimental study biomimetic surface shark skin drag reduction mechanism

Relationship between Occurrence and Progression of Lung Cancer and Nocturnal Intermittent Hypoxia, Apnea and Daytime Sleepiness

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2019年第4期39卷 568-575页

作者： wei LIU Miao luo yuan-yuan FANG Shuang wei Ling ZHOU Kui LIU Department of Respiratory and Critical Care Medicine the Central Hospital of WuhanTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430014China Department of Respiratory and Critical Care Medicine Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Departments of Medical Oncology the Third Affiliated Hospital of Kunming Medical University (Tumor Hospital of Yunnan Province)Kunming 65011& China

The possible relationship between lung cancer and nocturnal intermittent hypoxia,apnea and daytime sleepiness,especially the possible relationship between the occurrence and progression of lung cancer and obstructive sleep apnea syndrome (OSAS) was ***-five cases of primary lung cancer suitable for surgical resection at the Third Affiliated Hospital of Kunming Medical University between January 2017 and December 2017 were recruited (lung cancer group),and there were 45 patients in the control group who had no significant differences in age,sex and other general data from lung cancer *** analyzed covariates included general situation,snore score,the Epworth Sleeping Scale (ESS),Pittsburgh Sleep Quality Index (PSQI),apnea and hypopneas index (AHI),oxygen desaturation index 4 (ODk),lowest arterial oxygen saturation [LSpCh (%)],oxygen below 90% of the time [T90%(min)],the percentage of the total recorded time spend below 90% oxygen saturation (TS90%),to explore the possible relationship between lung cancer and above *** participants were followed up for one *** results showed that:(1) There was significant difference in body mass index (BMI),ESS,AHI,T90%(min),TS90%,ODh,snore score and LSpCh (%) between lung cancer group and control group (P0.05);(2) Patients in the lung cancer group were divided into OSAS subgroup and non- OSAS subgroup according to the international standard for the diagnosis of *** was significant difference in BMI,age,staging,incidence of concurrent hypertension and concurrent CHD,snore score,ESS score,T90%(min),TS90%,ODh and LSpCh (%) between OSAS subgroup and non-OSAS subgroup (P<0.05).There was no statistically significant difference in gender,PSQI score,incidence of concurrent diabetes,smoking history an

关键词： lung cancer nocturnal intermittent hypoxia apnea daytime sleepiness obstructive sleep apnea syndrome

Dense pair plasma generation and its modulation dynamics in counter-propagating laser field

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

Chinese Physics B 2018年第10期27卷 433-439页

作者： wei-yuan Liu Wen luo Tao yuan Ji-Ye Yu Min Chen School of Nuclear Science and Technology University of South ChinaHengyang 421001China Key Laboratory for Laser Plasmas（MoE） School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

With two-dimensional quantum electrodynamics（QED） particle-in-cell simulations, a dense electron-positron（e^-e~＋） pair generation from laser-solid interactions is demonstrated. When the interaction of two linearly polarized laser pulses with a thin target enters into the relativistic transparency regime, a stable standing wave（SW） field can be formed by the overlap of the two counter-propagating laser pulses directly. The present study aims to clarify the effects of the S W field on the dynamics of e^-e^＋ pair plasmas. Our results indicate that under the combined effect of the SW field and radiation reaction（RR） effect, the created e^-e^＋ pairs can be trapped into the electric field nodes when the field strength is *** trapping effect contributes to the generation of γAV≥400 and ultra-dense pair plasmas in the two-side irradiation scheme. Despite different laser intensities, these pair plasmas have a Maxwellian spectral distribution with a peak energy of 150 MeV. Besides, the periodical modulation of the average energy, spatial, phase-space, and angular patterns of the e^-e^＋ pair plasmas can be triggered. In the angular patterns, as long as the SW field exists, pair plasmas can be pinched along the laser polarization direction. These results may offer a better understanding of the laser-solid interactions in the experiments when 10-PW laser facilities come into operation in the future.

关键词： PIC simulation laser-plasma interaction standing wave radiation reaction

A New Signature Scheme with Shared Verification

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2006年第2期13卷 66-69页

作者： JIA Xiao-yun luo Shou-shan yuan Chao-wei School of Continuing Education Beijing University of Posts and Telecommunications Beijing 100876 P.R. China School of Software Engineering Beijing University of Posts and Telecommunications Beijing 100876 P.R. China National Key Laboratory of Integrated Service Networks Xidian University Xi'an 710071 P.R. China

With expanding user demands, digital signature techniques are also being expanded greatly, from single signature and single verification techniques to techniques supporting multi-users. This paper presents a new digital signature scheme with shared verification based on the fiat-shamir signature scheme. This scheme is suitable not only for digital signatures of one public key, but also for situations where multiple public keys are required. In addition, the scheme can resist all kinds of collusion, making it more practicable and safer. Additionally it is more efficient than other schemes.

关键词： digital signature shared verification verifiable secret sharing

Design of a modified circular-cut multiband fractal antenna

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2016年第6期23卷 68-75页

作者： Hu Zhangfang Xin wei luo yuan Hu Yinping Zhou Yongxin Institute of Photoelectronic Engineering Chongqing University of Posts and Telecommunications

This paper presents a modified circular-cut multiband fractal antenna with good radiation patterns designed for digital cellular system（DCS）, personal communication system（PCS）, 2.4/5.2/5.8 GHz wireless local area networks（WLAN） and 2.5/3.5/5.5 GHz worldwide interoperability for microwave access（WiMAX） applications simultaneously. Originally, the modified circular monopole antenna is designed to resonate at around 2.1 GHz and 3.6 GHz. After subtracting the circular iterative tree fractal structure, it can produce three other resonances at around 5.6 GHz, 6.47 GHz and 7.89 GHz. Besides, as the number of iterations increases, not only do the new frequency bands appear（it demonstrates the good self-similarity property of the proposed antenna）, but also the operating bands shift from high frequency to low frequency（it shows the well space filling property）. Furthermore, the proposed antenna owns a compact structure, which can achieve the 5.28 dBi of relative high gain. And the measured results are basically accordant to simulated results, which proves the effectiveness of the proposed antenna.

关键词： multiband fractal monopole self-similarity space filling

Three-dimensional porous composite framework assembled withCuO microspheres as anode current collector for lithium-ionbatteries

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2019年第1期62卷 70-79页

作者： HUANG ShiMin luo Jian yuan wei ZHAO BoTe CHEN Yu TANG Yong School of Mechanical and Automotive Engineering South China University of Technology School of Materials Science and Engineering Georgia Institute of Technology

The surface structure and material composition of current collectors have significant effects on the electrochemical performances of lithium-ion batteries(LIBs). In this work, a three-dimensional(3D) porous composite framework is applied as the anode current collector in LIBs. This unique 3D skeleton is composed of conductive carbon fiber/Cu core/shell fibrous structure. With an oxidation treatment upon the copper shell, the porous framework is assembled with CuO microspheres. Using mesocarbon microbead(MCMB) graphite powders as the active material, the cell with this 3D porous composite current collector shows an improved reversible discharge-charge capacity of 415 mAh g^(–1) at a current rate of 0.1 C after 50 cycles, which is much higher than that of the cell with a flat Cu foil(127 mAh g^(–1)). It is demonstrated that this unique fibrous network of the 3D current collector coupled with the morphological effects of the CuO microspheres greatly improve the cell performance in terms of electrical conductivity, reversible capacity and cycling stability.

关键词： lithium-ion battery current collector porous framework CuO microspheres carbon fiber

Preparation of Cu(In,Al)(Se,S)2 Thin Films by Low-Cost Non-vacuum Hybrid Process

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2015年第6期28卷 -页

作者： Zhao-fan Liu wei Xia Chen-chen yuan Pai-feng luo Department of Materials Science and Engineering Hefei University of Technology Hefei 230009China CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Hefei 230026 China

Cu(In,Al)(Se,S)2 thin films were successfully obtained through a simple low-cost non-vacuum process. The Cu(In,Al)Se2 raw material powder was firstly synthesized by a traditional solvothermal route. Then, the precursor coatings were prepared by drop-coating Cu(In, Al)Se2 slurry. Finally, the Cu(In,Al)Se2 and Cu(In,Al)(Se,S)2 films were achieved by the selenization and/or sulfuration process. Through X-ray diffraction (XRD), scanning electron microscope, X-ray fluorescence, and absorption spectroscopy measurement, it was found that all the films show the single chalcopyrite phase structure and have the preferred (112) orientation. Meanwhile, after substituting selenium by sulfur, the main XRD peaks shift to higher 2θ degrees and the porous films become more compact. The energy band gap also increases to a suitable range for light absorption from 1.21 eV to 1.33 eV, which indicates that the additional sulfuration process is much more favorable for improving the quality of Cu(In,Al)(Se,S)2 films.

关键词： Non-vacuum Solvothermal X-ray diffraction Sulfuration