检索结果-南通市图书馆

RAYLEIGH-TAYLOR INSTABILITIES BY OVERTURNING EXPERIMENTS IN TANK

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第3期19卷 303-308页

作者： LI Xi CHU vincent H. Department of Ocean and Traffic Engineering Hohai University Nanjing 210098 China Deptartment of Civil Engineering and Applied Mechanics McGill University Montreal H3A 2K6 Canada

A laboratory study of the turbulence front initiated by the Rayleigh-Taylor instabilities was conducted by overturning a two-layer stratified flow in a tank. Dye was introduced to the upper layer and the concentration of the dye was determined using a video imaging method. The mass center of the heavier upper layer moved continuously to a lower elevation because of the intrusion of the heavier fluid into the lower layer and the lighter fluid into the upper layer. The downward movement of the mass center was accurately determined from the dye concentration profile. It is concluded that the initial advancement of the mass center follows a quadratic relation with time and the final advancement obeys a linear relation with time.

关键词： Rayleigh-Taylor instability stratified flow turbulent mixing video imaging technique overturning experiment

Advantages of a Biomimetic Stiffness Profile in Pitching Flexible Fin Propulsion

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2010年第2期7卷 113-119页

作者： Paul Riggs Adrian Bowyer Julian vincent Biomimetics Group Mechanical Engineering DepartmentUniversity of Bath

The use of oscillating flexible fins in propulsion has been the subject of several studies in recent years, but attention israrely paid to the specific role of stiffness profile in thrust *** profile is defined as the variation in localchordwise bending stiffness (EI) of a fin, from leading to trailing *** this study, flexible fins with a standard NACA0012shape were tested alongside fins with a stiffness profile mimicking that of a Pumpkinseed Sunfish (Lepomis gibbosus).The finswere oscillated with a pitching sinusoidal motion over a range of frequencies and amplitudes, while torque, lateral force andstatic thrust were *** the range of oscillation parameters tested, it was shown that the fin with a biomimetic stiffness profile offered a significantimprovement in static thrust, compared to a fin of similar dimensions with a standard NACA0012 aerofoil *** fin also produced thrust more consistently over each oscillation cycle.A comparison of fin materials of different stiffness showed that the improvement was due to the stiffness profile itself, andwas not simply an effect of altering the overall stiffness of the *** of the same stiffness profile were observed to follow thesame thrust-power curve, independent of the stiffness of the moulding *** fins were shown to produce up to26% greater thrust per watt of input power, within the experimental range.

关键词： biomimetic propulsion stiffness pitching flexible fin

Provably secure authentication protocol for traffic exchanges in unmanned aerial vehicles

在线全文

学校读者我要写书评

暂无评论

High-Confidence Computing 2023年第4期3卷 60-72页

作者： vincent Omollo Nyangaresi Department of Computer Science&Software Engineering Jaramogi Oginga Odinga University of Science&TechnologyKenya

Unmanned aerial vehicles offer services such as military reconnaissance in potentially adversarial controlled *** addition,they have been deployed in civilian critical infrastructure *** this environment,real-time and massive data is exchanged between the aerial vehicles and the ground control *** on the mission of these aerial vehicles,some of the collected and transmitted data is sensitive and ***,many security protocols have been presented to offer privacy and security ***,majority of these schemes fail to consider attack vectors such as side-channeling,de-synchronization and known secret session temporary information *** last attack can be launched upon adversarial physical capture of these *** addition,some of these protocols deploy computationally intensive asymmetric cryptographic primitives that result in high *** this paper,an authentication protocol based on lightweight quadratic residues and hash functions is *** formal security analysis is executed using the widely deployed random oracle *** addition,informal security analysis is carried out to show its robustness under the Dolev–Yao(DY)and Canetti–Krawczyk(CK)threat *** terms of operational efficiency,it is shown to have relatively lower execution time,communication costs,and incurs the least storage costs among other related ***,the proposed protocol provides a 25%improvement in supported security and privacy features and a 6.52%reduction in storage *** overall,the proposed methodology offers strong security and privacy protection at lower execution time,storage and communication overheads.

关键词： Authentication Drones Quadratic residues Privacy Security Side-channeling UAV

A modeling framework for the integration of electrical and thermal energy systems in greenhouses

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

Building Simulation 2022年第5期15卷 779-797页

作者： Queralt Altes-Buch Sylvain Quoilin vincent Lemort Energy Systems Research Unit Faculty of Applied SciencesUniversity of LiegeAllee de la Decouverte 774000 LiegeBelgium

Greenhouse horticulture is associated to a significant energy consumption in temperate countries,mainly for lighting and for ***,the potential for energy optimization and energy savings is high but requires detailed models capable of considering various system configurations and control *** paper provides an open-source modeling framework capable of simulating and optimizing the design and the control of both the greenhouse and the generation systems covering all energy *** proposed model is composed of sub-models from different scientific fields:a greenhouse climate model,a crop yield model,a large number of energy generation and storage units models and different rule-based control *** association of such state-of-the-art models in a single framework provides a powerful tool for optimization purposes and allows the definition of completely customized systems by means of an object-oriented *** this work,various control strategies are defined and simulated,thus demonstrating the capabilities of the proposed *** indicate that,by performing minor changes to the control of the thermal screen,heating consumption can be reduced by 3%without any loss in crop *** control of heat-generation units also has a significant impact on the operational costs,which vary by up to 17%when self-consumption levels are accounted for in the control strategy.

关键词： greenhouse climate model CHP greenhouse climate control system integration energy management

Post-analysis simulation of the collapse of an open sabo dam of steel pipes subjected to boulder laden debris flow

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

International Journal of Sediment Research 2020年第6期35卷 621-635页

作者： Toshiyuki Horiguchi vincent Richefeu Department of Civil Engineering National Defense Academy Universite Grenoble Alpes Laboratoire 3SR (solsSolidesStructuresRisques)

The objective of the proposed method is to utilize a site investigation of a debris flow disaster and verify a real scale analysis to evaluate the impulsive load on an open sabo *** Nagiso debris flow disaster which occurred in Nagano in 2014,where damage caused by Typhoon Neogri was *** verification result of the site investigation demonstrated the weak components of the open Sabo dam experienced damage owing to the debris flow.A discrete element method is normally applied to a solid body to calculate an interaction function force with respect to the contact point between boulders and the *** numerical method initially concatenates elements that model the open Sabo ***,the stiffness coefficient of flanges and coupling joints between pipes was expressed to utilize the sectional partition method to determine the structural *** method was improved to separate from the connecting elements beyond the boundary *** debris flow model uses a water flow distribution model,and the debris flow flowed from 200m upstream of the open sabo ***,the proposed method was examined to verify the primary cause of damage to the open sabo dam and used to reproduce the circumstances that evaluated the impulsive load occurrence mechanism in the case of a real *** addition,the coupling joints between the hollow steel pipes utilized a’reproduction analysis’ for a real sabo dam and a‘reinforced analysis’ for a reinforced sabo dam were applied to assess the weak point of the dam.

关键词： Open sabo dam Site investigation Damage verification Discrete element method

On the Index of Finite Determinacy of Vector Fields with Resonances

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2008年第8期24卷 1401-1408页

作者： vincent NAUDOT Jia Zhong YANG Mathematics Institute University of Warwick Coventry CV4 7AL U.K. LMAM School of Mathematical Sciences Peking University Beijing 100871 P. R. China

In this paper we study normal forms for a class of germs of 1-resonant vector fields on R^n with mutually different eigenvalues which may admit extraneous resonance relations. We give an estimation on the index of finite determinacy from above as well as the essentially simplified polynomial normal forms for such vector fields. In the case that a vector field has a zero eigenvalue, the result leads to an interesting corollary, a linear dependence of the derivatives of the hyperbolic variables on the central variable.

关键词： index of finite determinacy normal forms resonance vector fields

The Materials Revolution

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2006年第4期3卷 217-234页

作者： Julian F.V.vincent Department of Mechanical Engineering The University of Bath Bath BA2 7AY UK

In the final essay of this series the gaps between biology and engineering are examined, and methods are suggested for crossing them. Creativity is seen as the essential, and TRIZ （the Russian Theory of Inventive Problem Solving） is recommended as the best set of methods both for stimulating creativity and for solving technical problems. When the catalogue of Inventive Principles of TRIZ is used to bring biology and technology to the same level of detail, the comparison shows that the similarity is only about 12%. The differences largely reside in the reliance of energy as a controlling parameter in conventional technology and the replacement of energy by information in biological systems. Although we might be moving slowly in this direction, a numerically based comparison such as this should provide more impetus.

关键词： The Materials Revolution

Overview of dyslipidemia and metabolic syndrome in myeloproliferative neoplasms

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Oncology 2024年第6期15卷 717-729页

作者： Mihnea-Alexandru Găman Bahadar Singh Srichawla Yong-Feng Chen Poulami Roy Arkadeep Dhali Ahmed Nahian Muhammad Romail Manan vincent Kipkorir Richard Christian Suteja Lakshmi Venkata Simhachalam Kutikuppala Amelia Maria Găman Camelia Cristina Diaconu Faculty of Medicine “Carol Davila”University of Medicine and PharmacyBucharest 050474Romania Department of Hematology Center of Hematolog Department of Cellular and Molecular Pathology Stefan S Nicolau Institute of VirologyRomanian AcademyBucharest 030304Romania Department of Neurology University of Massachusetts Chan Medical SchoolWorcesterMA 01655United States Department of Basic Medical Sciences School of Medicine of Taizhou UniversityTaizhou UniversityTaizhou 318000Zhejiang ProvinceChina Department of Medicine North Bengal Medical College and HospitalWest Bengal 734012India Academic Department of Gastroenterology Sheffield Teaching Hospitals NHS Foundation TrustSheffield S57AUUnited Kingdom Lecom at Seton Hill GreensburgPA 15601United States Faculty of Medicine Services HospitalLahore 54000Pakistan Department of Human Anatomy and Physiology University of NairobiNairobi 00100Kenya Faculty of Medicine Udayana UniversityDenpasarBali 80361Indonesia Department of General Surgery Dr.NTR University of Health SciencesVijayawada 520008Andhra PradeshIndia Department of Pathophysiology University of Medicine and Pharmacy of CraiovaCraiova 200349Romania Clinic of Hematology Filantropia City HospitalCraiova 200143Romania Department of Internal Medicine Faculty of Medicine“Carol Davila”University of Medicine and PharmacyBucharest 050474Romania Internal Medicine Clinic Clinical Emergency Hospital of BucharestBucharest 105402Romania

Myeloproliferative neoplasms(MPNs)occur due to the abnormal proliferation of one or more terminal myeloid cell lines in peripheral *** suffering from MPNs display a high burden of cardiovascular risk factors,and thrombotic events are often the cause of death in this population of ***,we provide a brief overview of dyslipidemia and metabolic syndrome and their epidemiology in MPNs and examine the common molecular mechanisms between dyslipidemia,metabolic syndrome,and MPNs,with a special focus on cardio-vascular risk,atherosclerosis,and thrombotic ***,we investigate the impact of dyslipidemia and metabolic syndrome on the occurrence and survival of thrombosis in MPN patients,as well as the management of dyslipidemia in MPNs,and the impact of MPN treatment on serum lipid concentrations,particularly as side/adverse effects reported in the context of clinical trials.

关键词： Polycythemia vera Essential thrombocythemia Myelofibrosis Cardiovascular disease Hypercholesterolemia Hypertriglyceridemia Obesity Diabetes Inflammation Oxidative stress

Aurone derivatives as Vps34 inhibitors that modulate autophagy

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 Pharmaceutica Sinica B 2019年第3期9卷 537-544页

作者： Guodong Li Joshua William Boyle Chung-Nga Ko Wu Zeng vincent Kam Wai Wong Jian-Bo Wan Philip Wai Hong chan Dik-Lung Ma Chung-Hang Leung State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao999078China School of Chemistry Monash UniversityClayton3800Australia Department of Chemistry Hong Kong Baptist UniversityHong Kong999077China State Key Laboratory of Quality Research in Chinese Medicine Macao University of Science and TechnologyMacao999078China Department of Chemistry University of WarwickCoventry CV47ALUK

We report in this study the identification of a natural product-like antagonist(1a) of Vps34 as a potent autophagy modulator via structure-based virtual screening. Aurone derivative 1a strongly inhibited Vps34 activity in cell-free and cell-based assays. Significantly, 1a prevents autophagy in human cells induced either by starvation or by an mT OR inhibitor. In silico modeling and kinetic data revealed that 1a could function as an ATP-competitive inhibitor of Vps34. Moreover, it suppressed autophagy in vivo and without inducing heart or liver damage in mice. 1a could be utilized as a new motif for more selective and efficacious antagonists of Vps34 for the potential treatment of autophagy-related human diseases.

关键词： Autophagy Natural products Vps34 Inhibitor Structure-based virtual screening Vesicle trafficking Heart or liver damage Aurone derivative