45915 research outputs found
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Silicon microspheres for terahertz communication
No full textSilicon microspheres can be used for free space optical communication applications in the THz communication bands. The morphology dependent resonances of the microsphere have quality factors of 100000, which provide the narrow linewidths for high resolution filtering, Raman lasers, modulators, and CMOS compatible detectors
Content-aware scalability-type selection for rate adaptation of scalable video
No full textScalable video coders provide different scaling options, such as temporal, spatial, and SNR scalabilities, where rate reduction by discarding enhancement layers of different scalability-type results in different kinds and/or levels of visual distortion depend on the content and bitrate. This dependency between scalability type, video content, and bitrate is not well investigated in the literature. To this effect, we first propose an objective function that quantifies flatness, blockiness, blurriness, and temporal jerkiness artifacts caused by rate reduction by spatial size, frame rate, and quantization parameter scaling. Next, the weights of this objective function are determined for different content (shot) types and different bitrates using a training procedure with subjective evaluation. Finally, a method is proposed for choosing the best scaling type for each temporal segment that results in minimum visual distortion according to this objective function given the content type of temporal segments. Two subjective tests have been performed to validate the proposed procedure for content-aware selection of the best scalability type on soccer videos. Soccer videos scaled from 600 kbps to 100 kbps by the proposed content- aware selection of scalability type have been found visually superior to those that are scaled using a single scalability option over the whole sequence
Regulation of ryanodine receptor RyR2 by protein-protein interactions: prediction of a PKA binding site on the N-terminal domain of RyR2 and its relation to disease causing mutations
No full textProtein-protein interactions are the key processes responsible for signaling and function in complex networks. Determining the correct binding partners and predicting the ligand binding sites in the absence of experimental data require predictive models. Hybrid models that combine quantitative atomistic calculations with statistical thermodynamics formulations are valuable tools for bioinformatics predictions. We present a hybrid prediction and analysis model for determining putative binding partners and interpreting the resulting correlations in the yet functionally uncharacterized interactions of the ryanodine RyR2 N-terminal domain. Using extensive docking calculations and libraries of hexameric peptides generated from regulator proteins of the RyR2 channel, we show that the residues 318-323 of protein kinase A, PKA, have a very high affinity for the N-terminal of RyR2. Using a coarse grained Elastic Net Model, we show that the binding site lies at the end of a pathway of evolutionarily conserved residues in RyR2. The two disease causing mutations are also on this path. The program for the prediction of the energetically responsive residues by the Elastic Net Model is freely available on request from the corresponding author
Quantum state transfer among crystallographic groups of N-V centers in diamond
No full textWe investigate collections of Nitrogen-Vacancy (N-V) Centers in diamond crystals coupled to a circuit QED system of a coplanar waveguide (CPWG) resonator. Our analysis reveals that different symmetry axes oriented N-V centers in the diamond host can be grouped into bosonic modes of collective quasi-spin wave excitations so that the hybrid system can be described as an analog of an exciton-polariton type cavity QED model. We examine such model for quantum state transfer among distinct crystallographic groups of N-V centers in a single diamond as well as two spatially distant diamonds. Rabi oscillations, mode entanglement, possible use of N-V classes as spin ensemble qubits and an implementation of continuous-time quantum random walk are discussed
Parameterization of submesoscale eddy-rich flows using a stochastic velocity model
No full textIn light of the recent high-resolution radar data of surface velocity, which have revealed submesoscale eddies between the Florida Current and the coast, an objective method of detecting eddies and estimating their parameters such as center coordinates, size, and intensity is suggested. The obtained statistics are used to parametrically represent the birth-death process of eddies filling up the observation area via a model stochastic velocity field known as Cinlar flow. It appears that the suggested approach leads to a reasonable parameterization of this process for potential future use in OGCMs or coastal models
String-inspired Chern-Simons modified gravity in four dimensions
No full textField equations of the Chern-Simons modified gravity in four dimensions are obtained by a truncation of the field equations of the low energy effective string models with first order corrections in the string constant included
A model-based heuristic to the min max K-arc routing for connectivity problem
No full textWe consider the post-disaster road clearing problem with the goal of restoring network connectivity in shortest time. Given a set of blocked edges in the road network, teams positioned at depot nodes are dispatched to open a subset of them that reconnects the network. After a team finishes working on an edge, others can traverse it. The problem is to find coordinated routes for the teams. We generate a feasible solution using a constructive heuristic algorithm after solving a relaxed mixed integer program. In almost 70 percent of the instances generated both randomly and from Istanbul data, the relaxation solution turned out to be feasible, i.e. optimal for the original problem
Reliefs of Hittite pantheon in Chamber A, Yazılıkaya
No full textThe reliefs of Chamber A at Yazılıkaya sanctuary illustrates rock-cut relief of 64 deities in procession. The left wall shows a procession of male deities, wearing the traditional kilts, pointed shoes and horned hats. The processions lead to a central scene of the supreme couple of the pantheon: the storm-god Teshub and the sun-goddess Hebat. Teshub stands on two mountain gods whilst Hebat stands on a panther. Behind Hebat are shown their son Sharruma, daughter Alanzu and a grand daughter. In this image we see figure nos, 29/30/31, 65/66/67, and 68/81/82/83/84/85/86/87/88/89/90/91/97.Black & white photograph
The gods of the Hittite pantheon, Yazılıkaya
No full textYazılıkaya sanctuary illustrates rock-cut relief of 64 deities in procession. The left wall shows a procession of male deities, wearing the traditional kilts, pointed shoes and horned hats. The processions lead to a central scene of the supreme couple of the pantheon: the storm-god Teshub and the sun-goddess Hebat. Teshub stands on two mountain gods whilst Hebat stands on a panther. Behind Hebat are shown their son Sharruma, daughter Alanzu and a grand daughter.Black & white photograph
The storm-god Teshub and the sun-goddess Hebat, Yazılıkaya Chamber A
No full textThe relief of Chamber A at Yazılıkaya sanctuary which illustrates rock-cut relief of 64 deities in procession. The left wall shows a procession of male deities, wearing the traditional kilts, pointed shoes and horned hats. The processions lead to a central scene of the supreme couple of the pantheon: the storm-god Teshub and the sun-goddess Hebat. Teshub stands on two mountain gods whilst Hebat stands on a panther. Behind Hebat are shown their son Sharruma, daughter Alanzu and a grand daughter.Black & white photograph