63 research outputs found
Dynamic Super Round Based Distributed Task Scheduling for UAV Networks
No full textNetworks of Unmanned Aerial Vehicles (UAVs) are emerging in many application domains, e.g., military surveillance. To perform collaborative tasks, the involved UAVs exchange several types of information, e.g., sensor data and commands. The major question here is how to schedule the tasks under dynamic traffic flows to provide network services. Existing solutions use the Round-Robin Strategy (RRS), where the tasks are scheduled statistically by dividing the time into fixed-length rounds. However, the RRS wastes significant network and device resources due to task scheduling in each round. This paper proposes DROVE – a novel clustering approach that allows the UAVs for dynamic task scheduling. However, determining the task scheduling is crucial, as it significantly affects several network parameters, e.g., throughput. Therefore, we devise the problem of distributed task scheduling under dynamic traffic flow scenarios to optimize the throughput. We propose a clustering task scheduling algorithm to serve dynamic traffic flows. Particularly, we integrate the dynamic traffic flows into the Lyapunov drift analysis framework, and determine the throughput optimality of our proposed scheduling algorithm. We perform extensive simulations to validate the effectiveness of DROVE. The results show that DROVE outperforms the state-of-the-art solutions in terms of energy consumption, clustering overhead, throughput, end-to-end delay, flow success rate and packet drop rate. </p
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No full textThe Ca2+-sensor synaptotagmin-1 that triggers neuronal exocytosis binds to negatively charged membrane lipids (mainly phosphatidylserine (PtdSer) and phosphoinositides (Ptdlns)) but the molecular details of this process are not fully understood. Using quantitative thermodynamic, kinetic and structural methods, we show that synaptotagmin-1 (from Rattus norvegicus and expressed in Escherichia coli) binds to Ptdlns(4,5)P-2 via a polybasic lysine patch in the C2B domain, which may promote the priming or docking of synaptic vesicles. Ca2+ neutralizes the negative charges of the Ca2+-binding sites, resulting in the penetration of synaptotagmin-1 into the membrane, via binding of PtdSer, and an increase in the affinity of the polybasic lysine patch to phosphatidylinositol-4,5-bisphosphate (PtdIns(4,5)P-2). These Ca2+-induced events decrease the dissociation rate of synaptotagmin-1 membrane binding while the association rate remains unchanged. We conclude that both membrane penetration and the increased residence time of synaptotagmin-1 at the plasma membrane are crucial for triggering exocytotic membrane fusion
Investigation on the Origin of Dispersion Interaction in Weakly Bound Phenylacetylene•CnHm clusters using dispersion corrected density functional calculations
No full textDispersion interaction is the attractive forces between an instantaneous dipole and induced dipole, generated due to the correlated movement of electrons in interacting molecules. Dispersion dominated intermolecular interaction has been the topic of interest among scientific communities to describe physical, chemical, and biological phenomena of diverse chemical systems such as crystal packing, protein folding, conformations and configurations of many biomolecules and polymers. Understanding the nature and origin of the interaction requires both experimental and theoretical investigations and a mutual agreement between them. In this project, we are going to investigate the dispersion interaction of PHA-CnHm clusters, where PHA is a non-polar S molecule with π-electron density which can form C-H/π bound complexes which are significantly different than the conventional hydrogen bonds like O-H/π or N-H/π. We have used density functional theory with dispersion correction using B3LYP-D3, PBE0-D3 functionals with def2-TZVPP and aug-cc-pVDZ basis sets to calculate the electronic structures and stabilization energies with the help of TURBOMOLE software. The intermolecular dispersion terms are calculated using two different numerical models as functions of (i) molecular dispersion and (ii) total dispersion by atomic polarizability. The model with total dispersion energy providing a good correlation with the binding energy of the cluster than molecular dispersion model. Success of this method, lead us to propose a novel numerical method based on the contribution by whole sets of atoms, which is able to determine the origin of C-H/π interaction
Seismic Damage Evaluation of Gravity Load Designed Low Rise RC Building Using Non-linear Static Method
No full textAbstractIn India, the 2001 Bhuj earthquake has given a serious warning to many existing reinforced concrete (RC) buildings. However, a considerable portion of the building stock of India is reinforced concrete buildings which are generally designed mainly for gravity loads only. Therefore, potential seismic evaluation of these buildings, especially in high seismic region, is very essential in order to implement any kind of seismic hazard mitigation strategy. Hence, the present study aims to evaluate the seismic vulnerability of low rise RC frame building which is designed for gravity load according to the Indian code. The non-linear static analysis is performed using SAP2000 (v16) to find the capacity curve of the building. Fragility analysis is used to develop the fragility curve for different damage grade based on HAZUS methodology. Damage probability matrices (DPM) are formed for two different seismic hazard levels i.e. for maximum considered earthquake and design basis earthquake depending on the performance point to compare the damage state for each hazard level. The result shows that the damage of considered building is vary from moderate to severe damage state to the corresponding different seismic hazard level
Electrical conductivity and current-voltage hysteresis behavior of BiFeO3 doped PVA nanocomposite film
No full textBook Review - Development Communication: Reframing the Role of Media
No full textDevelopment Communication: Reframing the Role of Media is a book that offers an overview of the history of development communication while exploring the main actors of the field and world culture.The author, Thomas McPhail, has written a book with a strong theoretical focus on development communication studies ranging from modernization theories to the movements of liberation theology to participatory communication, cultural imperialism and education-entertainment. Readers will find this book useful for understanding past, present and possible future directions of the development communication field.
Role of rural off-farm employment in earning income and livelihood in the coastal region of West Bengal, India
No full textThe study was conducted in the coastal region of West Bengal, India to document the prevalent farming systems and explore the opportunity of nonfarm activities in generating income and livelihood for the rural households. This paper concentrates in finding out the key determinants of participation in nonfarm income and employment generation activities across rural households. The analytical framework yields different activity choices as optimal solutions to a simple utility maximization problem. The empirical inquiry reveals that education, family size and access to land assets plays major role in accessing more remunerative nonfarm employment. The region is quite underdeveloped such that traditional rural self-employment activities still contributes 30.94 percent of household income and provide employment to 40.71 percent rural household. The number of working men, number of working women, age and education level are the other important determinants of nonfarm activities for the rural households
Study of Adsorption of Malachite Green on Dried <I>Aspergillus versicolor</I> (MTCC280) Biomass
No full textDyes are extensively used in textile, tannery, food, paper and pulp, printing industries to color their products. About 10-15% of the annual global production (2,80,000 tons) of dyes are discharged as effluent mainly by textile and paint industries. The majority of the dyes are toxic and cause damage to aquatic life. In this study biosorption of Malachite Green (MG) onto the lyophilised <em>Aspergillus versicolor</em> Biomass (AVB) was investigated with variation in pH, temperature, contact time, biosorbent concentration and dye concentration. Characterization of the dye-biosorbent interaction was studied by scanning electron microscopy. It was observed from the present study that the biosorption of Malachite green was maximum at pH 5.0, temperature of 30°C, and adsorbent concentration of 2g/L. The rate of adsorption was found to be very fast at the initial phase and the equilibrium reached within 270 min following the pseudo-second order rate kinetics. The adsorption process followed Freundlich Isotherm model. The treated and untreated AVB was characterized for the investigation of possible dye-biosorbent interaction and surface morphology by Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) respectively. The results show that the present study may help designing a promising route towards bioremediation of the hazardous chemical MG.</jats:p
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