|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | LEO Enhanced Global Navigation Satellite System(LeGNSS):progress,opportunities,and challenges显示文摘With the completion of Chinese BeiDou Navigation Satellite System(BDS),the world has begun to enjoy the Positioning,Navigation,and Timing(PNT)services of four Global Navigation Satellite Systems(GNSS).In order to improve the GNSS performance and expand its applications,Low Earth Orbit(LEO)Enhanced Global Navigation Satellite System(LeGNSS)is being vigorously advocated.Combined with high-,medium-,and low-earth orbit satellites,it can improve GNSS performance in terms of orbit determination,Precise Point Positioning(PPP)convergence time,etc.This paper comprehensively reviews the current status of LeGNSS,focusing on analyzing its advantages and challenges for precise orbit and clock determination,PPP convergence,earth rotation parameter estimation,and global ionosphere modeling.Thanks to the fast geometric change brought by LEO satellites,LeGNSS is expected to fundamentally solve the problem of the long convergence time of PPP without any augmentation.The convergence time can be shortened within 1 minute if appropriate LEO constellations are deployed.However,there are still some issues to overcome,such as the optimization of LEO constellation as well as the real time LEO precise orbit and clock determination. | Haibo Ge Bofeng Li Song Jia Liangwei Nie Tianhao Wu Zhe Yang Jingzhe Shang Yanning Zheng Maorong Ge | 2022 | Geo-Spatial Information Science2022，25，1： | 4 |
| 2 | Numerical investigation on flow and heat transfer characteristics of supercritical RP-3 in inclined pipe显示文摘Numerical simulations of flow and heat transfer to supercritical RP-3 through the inclined tubes have been performed using LS k–e model embedded in Fluent. The physical properties of RP-3 were obtained using the generalized corresponding state laws based on the fourcomponent surrogate model. Mass flow rate is 0.3 g/s, system pressure is 3 MPa, inlet temperature is 373 K. Inclination of the inclined pipe varied from -90° to 90°, with heat flux varied from 300 k W/m^2 to 400 kW/m^2. Comparison between the calculated result and the experimental data indicates the range of error reasonable. The results of ±45° show that temperature inhomogeneity in inclined pipe produce the secondary flow in its cross section due to the buoyancy force. Depending on the strength of the temperature inhomogeneity, there will be two different forms of secondary flow and both contribute to the convective heat transfer in the pipe. The secondary flow intensity decreases when the inhomogeneity alleviates and thermal acceleration will play a leading role. It will have a greater impact on the turbulent flow to affect the convective heat transfer in the pipe. When changing the inclination, it affects the magnitude of the buoyant component in flow direction. The angle increases, the buoyancy component decreases. And the peak temperature of wall dominated by the secondary flow will move forward and increase in height. | Zhi TAO Liangwei LI Jianqin ZHU Xizhuo HU Longyun WANG Lu QIU | 2019 | Chinese Journal of Aeronautics2019，32，8： | 3 |
| 3 | A dynamically evolving war between autophagy and pathogenic microorganisms显示文摘Autophagy is an intracellular degradation process that maintains cellular homeostasis.It is essential for protecting organisms from environmental stress.Autophagy can help the host to eliminate invading pathogens,including bacteria,viruses,fungi,and parasites.However,pathogens have evolved multiple strategies to interfere with autophagic signaling pathways or inhibit the fusion of autophagosomes with lysosomes to form autolysosomes.Moreover,host cell matrix degradation by different types of autophagy can be used for the proliferation and reproduction of pathogens.Thus,determining the roles and mechanisms of autophagy during pathogen infections will promote understanding of the mechanisms of pathogen-host interactions and provide new strategies for the treatment of infectious diseases. | Qianqian ZHENG Liangwei DUAN Yang ZHANG Jiaoyang LI Shiyu ZHANG Hui WANG | 2022 | Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2022，23，1： | 2 |
| 4 | A truncated C-terminal fragment of Mycobacterium tuberculosis HSP70 gene enhanced potency of HBV DNA vaccine显示文摘 | Xiangming Li Xiaofeng Yang Liangwei Li Haibo Liu Jing Liu | 2006 | Vaccine2006，，16： | 1 |
| 5 | Unsymmetrical photochromic bithienylethene-bridge tetraphenylethene molecular switches:Synthesis,aggregation-induced emission and information storage显示文摘Aggregation-induced emission(AIE) active photochromic molecules have attracted growing attention for their versatile applications.Here we designed and synthesized five newly unsymmetrical photochromic diarylethene(DAE) dyads(BTE1-5) by connecting tetraphenylethene(TPE) and aromatic substituent via bithienylethene(BTE) bridge.The chemical structures of those compounds were identified by ^1H NMR,^(13)C NMR and HRMS.The absorption and emission of these dyads were investigated by UV-vis and fluore scence spectroscopy,respectively.The results showed that all those compounds exhibited typically AIE or aggregation-induced emission enhancement(AIEE) characteristic.Particularly,when an aggregationcaused quenching(ACQ) fluorophore(triphenylamine) was grafted to the molecule,connecting with TPE via BTE-bridge,the ACQ phenomenon was dissipated and converted to an AIE luminophore,and those compounds exhibited photochromism upon irradiation with alternative UV and visible light.The solution or solid of those compounds showed distinctly fluorescence switching 'ON' or 'OFF' observation upon irradiation with alternative UV and visible light.It is interesting that BTE1 could be applied in recording and rewritable information storage,and the cyclization quantum yields could be affected by substituent significantly. | Liangwei Ma Chengpeng Li Qing Yan Sheng Wang Wangen Miao Derong Cao | 2020 | Chinese Chemical Letters2020，31，2： | 1 |
| 6 | Computational analysis of responsible dipeptides for optimum pH in G/11 xylanase 显示文摘 | Liangwei Liu Xiangqian Li Xun Li | 2004 | Biochem Biophys Res Commun2004，321，： | 1 |
| 7 | Two human monoclonal SARS-CoV-2 antibodies that maintain neutralizing potency against the SARS-CoV-2 Omicron BA.1 and BA.2 variants显示文摘The pandemic caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)continues to sweep the globe with devastating consequences on human lives and world economy.As an RNA virus,SARS-CoV-2 has a relatively high mutation rate and is rapidly evolving.Thus,new SARS-CoV-2 variants continued to emerge,5 of which were designated by the World Health Organization(WHO)as variants of concern(VOCs),Alpha(B.1.1.7). | Qianqian Zheng Liangwei Duan Zhihua Jiang Tingxuan Gu Bojie Zhang Jiaoyang Li Yang Zhang Shiyu Zhang Yinming Liang Hui Wang | 2023 | Genes & Diseases2023，10，3： | 0 |
| 8 | ON T-SPLINE CLASSIFICATION显示文摘The present paper conjectures a topological condition which classifies a T-spline into standard,semi-standard and non-standard.We also provide the basic framework to prove the conjecture on the classification of semi-standard T-splines and give the proof for the semi-standard of bi-degree(1,d)and(d,1)T-splines. | Xin Li Liangwei Hong | 2022 | Journal of Computational Mathematics2022，40，3： | 0 |
| 9 | HIV-1 exposure triggers autophagic degradation of stathmin and hyperstabilization of microtubules to disrupt epithelial cell junctions显示文摘Dear Editor,Human immunodeficiency virus type 1(HIV-1)infection is mainly initiated on mucosal epithelial surfaces.Exposure to HIV-1 impairs the mucosal epithelial barrier,allowing viral transmission across the mucosal epithelium.1 Interaction of HIV-1 envelope glycoprotein gp120 with its primary receptor,cluster of differentiation 4(CD4),and chemokine coreceptors has been implicated in the disruption of epithelial cell junctions upon HIV-1 exposure.1 However,the molecular details and underlying mechanisms of this disruption remain elusive. | Wei Xie Dengwen Li Dan Dong Yuanyuan Li You Zhang Liangwei Duan Xinqi Liu Wenxiang Meng Min Liu Jun Zhou | 2020 | Signal Transduction and Targeted Therapy2020，5，1： | 0 |
| 10 | Influence of Trace Oxygen on the Mechanical Properties of High Pure Silver during Natural Aging显示文摘Two kinds of high pure silver materials with 5.3 ppm oxygen and 32.7 ppm oxygen were prepared by various melting processes, both samples were subjected to accumulative rolling with 95% thickness reduction. Their mechanical properties were tested during long natural aging. Results showed that the Ag sheet with 5.3 ppm oxygen is at full annealed state when natural aging 58 days or kept at 150℃ for 30 minutes, and the Ag sheet with 32.7 ppm oxygen is a little of recovery when natural aging a year. It is suggested that appropriate oxygen interstitial solute in Ag solid solution and a few of Ag2O particles at Ag grain boundaries impede the recovery and recrystallization of Ag sheets. | XIE Hongchao ZHUANG Dianxiang LI Ji CHEN Liangwei YANG Anheng LUO Yanbo ZHU Yong | 2012 | 贵金属2012，33，A01： | 0 |
| 11 | Studies on Determination of Ge in Au Alloys by Potassium Iodate Potentiometric Titration Method显示文摘The paper presents a new method of determining Ge in gold alloys by potassium iodate potentiometric titration rather than by traditional distillation separation. The influences of conditions such as the reduction acidity, dosage of sodium hypophosphite and reduction time on the determination of Ge were studied. Comparison was made between the influences of end-point indication for potential method and starch method on accruracy and precision of the analysed results, stability and sensitivity of end-point, selectivity of method and so on. The possibility of reaction in an electrochemical way was discussed. Ge in the alloys such as AuGe 12 , AuGeNi 12 2 , AuAgGe 18.8 12.5 and AuAgGeNi 43.8 6 0.2 was measured, respectively, with the relative standard deviation of 0.10%~0.31% and the recoveries of added standard Ge in sample of 99.40%~100.40% when the reduction acidity was 0.40~0.80 mol/L HCl and 3.3 mol/L H 3 PO 4, 15 g sodium hypophosphite and reduction time 40 min. The new method presented is high accuracy and precision in results, good stability and sensibility in end point, easy operation and strong selectivity of determination. When it is applied to analyse actual samples, satisfactory results are achieved. | ZHU Liya ZHOU Yu TAN Yanshan LIU Wen LI Yong HAN Shouli TAN Wenjin HE Xiaotan WU Xilong XIE Hongchao CHEN Liangwei | 2012 | 贵金属2012，33，A01： | 0 |
| 12 | Serum thioredoxin activity:a promising biomarker for assessment of coronary stenosis severity in patients with coronary artery disease显示文摘Coronary artery disease(CAD)is one of the major death causes worldwide.Therapeutic methods may improve the progress of CAD.Thus,specific biomarkers are required for detecting coronary stenosis severity and monitoring therapy.Although spiral computed tomography(CT)angiography or coronary angiography may accurate detect coronary stenosis,the both techniques | Jinling Li Pei Wang Li Xiao Jianmin Yu Xianrui Kong Liangwei Zhong | 2017 | Science Bulletin2017，62，11： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员