排序方式: 共有17条查询结果,搜索用时 15 毫秒
1.
Convection naturelle a l'interieur d'un diedre. Etude experimentale du transfert de masse a la paroi
The authors review the electrochemical technique utilised and present the experimental correlations between the global average Sherwood and Rayleigh numbers. They compare these results with those obtained for a flat plate under the same condition. 相似文献
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FGWSO‐TAR: Fractional glowworm swarm optimization for traffic aware routing in urban VANET 下载免费PDF全文
In mobile distributed applications, such as traffic alert dissemination, dynamic route planning, file sharing, and so on, vehicular ad hoc network (VANET) has emerged as a feasible solution in recent years. However, the performance of the VANET depends on the routing protocol in accord with the delay and throughput requirements. Many of the routing protocols have been extensively studied in the literature. Although there are exemptions, they escalate research challenges in traffic aware routing (TAR) protocol of VANET. This paper introduces the fractional glowworm swarm optimization (FGWSO) for the TAR protocol of VANET in an urban scenario that can identify the optimal path for the vehicle with less traffic density and delay time. The proposed FGWSO searches the optimal routing path based on the fitness function formulated in this paper. Fractional glowworm swarm optimization is the combination of the GWSO and fractional theory. Moreover, exponential weighted moving average is utilized to predict the traffic density and the speed of the vehicle, which is utilized as the major constraints in the fitness function of the optimization algorithm to find the optimal traffic aware path. Simulation of FGWSO shows the significant improvement with a minimal end‐to‐end delay of 6.6395 seconds and distance of 17.3962 m, respectively, in comparison with the other existing routing approaches. The simulation also validates the optimality of the proposed TAR protocol. 相似文献
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Natthaphat Siri-Angkul Behzad Dadfar Riya Jaleel Jazna Naushad Jaseela Parambathazhath Angelia A. Doye Lai-Hua Xie Judith K. Gwathmey 《International journal of molecular sciences》2021,22(14)
The occurrence and prevalence of heart failure remain high in the United States as well as globally. One person dies every 30 s from heart disease. Recognizing the importance of heart failure, clinicians and scientists have sought better therapeutic strategies and even cures for end-stage heart failure. This exploration has resulted in many failed clinical trials testing novel classes of pharmaceutical drugs and even gene therapy. As a result, along the way, there have been paradigm shifts toward and away from differing therapeutic approaches. The continued prevalence of death from heart failure, however, clearly demonstrates that the heart is not simply a pump and instead forces us to consider the complexity of simplicity in the pathophysiology of heart failure and reinforces the need to discover new therapeutic approaches. 相似文献
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New experiments involving direct observation of colloidal clusters by optical microscopy promise to deliver a wealth of new information about such systems. Calculations suggest that some of the observable properties may be predicted using a simple pairwise potential to represent the interparticle forces, but in a range of parameter space that is distinctly different from previous representations of atomic clusters. The present contribution provides some benchmark calculations and predictions of structure, thermodynamics and rearrangement mechanisms for colloidal clusters containing up to 80 particles. The results suggest that distinct features characteristic of short-ranged interactions should be observable in terms of the structure, thermodynamics and dynamical properties. Analysis of a kinetic transition network for the 19-particle cluster reveals super-Arrhenius behaviour in the dynamics, analogous to a 'fragile' glass-former. 相似文献
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Petr Šulc Thomas E. Ouldridge Flavio Romano Jonathan P. K. Doye Ard A. Louis 《Natural computing》2014,13(4):535-547
We apply a recently-developed coarse-grained model of DNA, designed to capture the basic physics of nanotechnological DNA systems, to the study of a ‘burnt-bridges’ DNA motor consisting of a single-stranded cargo that steps processively along a track of single-stranded stators. We demonstrate that the model is able to simulate such a system, and investigate the sensitivity of the stepping process to the spatial separation of stators, finding that an increased distance can suppress successful steps due to the build up of unfavourable tension. The mechanism of suppression suggests that varying the distance between stators could be used as a method for improving signal-to-noise ratios for motors that are required to make a decision at a junction of stators. 相似文献
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The commercially available Jacobsen catalyst, N,N′-Bis(3,5-di-t-butylsalicylidene)-1,2-cyclohexanedi-aminomanganese(III) chloride 2 , is the most enantioselective catalyst developed to date for the asymmetric epoxidation of a broad range of unfunctionalized olefins. After describing the synthesis of the title compound a brief discussion of the epoxidation mechanism is given. Afterwards several applications for the enantioselective epoxidation of unfunctionalized olefins are described. For each application the scope and limitations are discussed 相似文献
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Robust Fractional-Order Proportional-Integral Observer for Synchronization of Chaotic Fractional-Order Systems 下载免费PDF全文
Ibrahima N Doye Khaled Nabil Salama Taous-Meriem Laleg-Kirati 《IEEE/CAA Journal of Automatica Sinica》2019,6(1):268-277
In this paper, we propose a robust fractional-order proportional-integral (FOPI) observer for the synchronization of nonlinear fractional-order chaotic systems. The convergence of the observer is proved, and sufficient conditions are derived in terms of linear matrix inequalities (LMIs) approach by using an indirect Lyapunov method. The proposed FOPI observer is robust against Lipschitz additive nonlinear uncertainty. It is also compared to the fractional-order proportional (FOP) observer and its performance is illustrated through simulations done on the fractional-order chaotic Lorenz system. 相似文献
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Ubarhande Sachin D. Doye Dharmpal D. Nalwade Prakash S. 《Wireless Personal Communications》2017,97(2):2087-2096
Mobile ad hoc network is open medium, infrastructure-less and easy to install. Despite these features, mobile ad hoc network is vulnerable to various security attacks. Black hole and gray hole security attacks outrank among all security attacks. This paper proposes a distributed delegation-based scheme, namely, a secure path selection scheme. The proposed scheme identifies and allows only trusted nodes to become part of active path. The simulation results revealed that proposed scheme improved the packet delivery ratio, packet loss rate, throughput by 8% and routing overhead by 5% as compared to other system.
相似文献10.
This paper presents a laboratory investigation to evaluate the capacity of alkaline residues to inhibit acid mine drainage. Column tests were used to evaluate the geochemical behavior of cement kiln dust (CKD) and red mud bauxite (RMB) used as covers, liners, or mixed with acid producing tailings and waste rocks. The most important indicators of neutralization are pH and the concentrations of metals in solution. Initial leachate pH of samples with an alkaline cover composed of 10% CKD or 10% of a mixture of CKD and RMB was low, but rapidly increased to near 7.0 and stabilized for the duration of this study. The use of alkaline materials as a liner had a positive effect on the reduction of Fe, SO4 and other metals such as Cu and Zn concentrations and the number of viable bacteria. In the cases where the alkaline layer was used as a liner or mixed with the waste rocks, near neutral pH values were rapidly reached in the leachate. However, in these columns the leachate pH values decreased over time. 相似文献