10,031
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Jul 30, 2014
07/14

by
javier pelaez

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Colaboracion con Ciencia al Cubo de RNE5

Topics: cerebro, podcast, ciencia, cubo, rne

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19

Jul 31, 2014
07/14

by
Freddy Fuenmayor

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La casa de las artes

Topic: Quito poquito a poquito

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1.0

Sep 4, 2019
09/19

by
radio Guareña (radio Guareña)

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Sexto programa de la segunda temporada del programa veraniego de radio Guareña

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5.0

Jun 30, 2018
06/18

by
Awais Khawar; Ahmed Abdelhadi; T. Charles Clancy

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Multiple-input multiple-output (MIMO) radar is a relatively new concept in the field of radar signal processing. Many novel MIMO radar waveforms have been developed by considering various performance metrics and constraints. In this paper, we show that finite alphabet constant-envelope (FACE) quadrature-pulse shift keying (QPSK) waveforms can be designed to realize a given covariance matrix by transforming a constrained nonlinear optimization problem into an unconstrained nonlinear optimization...

Topics: Networking and Internet Architecture, Mathematics, Computing Research Repository, Information Theory

Source: http://arxiv.org/abs/1407.8510

Quran: Number of Ruku'u, aayaat (verses), afaadh (words), number of letters-- Tateeb of Masahaf and Tateeb of Wahyy (order of revelation) قرآن مجيد، ترتيب مصحف، ترتيب وحي، عدد رکوعات، عدد آيات، عدد الفاظ و عدد حروف محمد عمر چنڊ

Topics: Quran, order of the Book: Masahaf, order of Wahyye, order of Revelation, Number of verses in the...

3
3.0

Apr 8, 2021
04/21

by
Russell Hay (russtheaerialist)

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WORK IN PROGRESS. 60mm length (before bend), 14.2mm hole

Topics: Landing_Gear, stl, thingiverse, R/C Vehicles, quadcopter

4
4.0

Apr 8, 2021
04/21

by
Edison Middle (EdisonM)

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This thing was made with Tinkercad. Homestuck quadrant symbols. Matesprits, moirails, kismesises, and auspices.

Topics: 3D Printing Tests, stl, symbols, thingiverse, homestuck

3
3.0

Apr 8, 2021
04/21

by
Timothy Chacko (thinklogically)

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Wax Stamp with quail image. Printed with plastic. The wax wasn't so good because I couldn't find my lighter. :(

Topics: stl, Art Tools, thingiverse

132
132

Oct 10, 2014
10/14

by
Tolsgaard, Martin G; Ku, Cheryl; Woods, Nicole N; Kulasegaram, Kulamakan Mahan; Brydges, Ryan; Ringsted, Charlotte

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This article is from BMJ Open , volume 4 . Abstract Introduction: Research in medical education has increased in volume over the past decades but concerns have been raised regarding the quality of trials conducted within this field. Randomised controlled trials (RCTs) involving educational interventions that are reported in biomedical journals have been criticised for their insufficient conceptual, theoretical framework. RCTs published in journals dedicated to medical education, on the other...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4120313

3
3.0

Jun 30, 2018
06/18

by
Daniel Kimball; Elizabeth Michel; Paul Keltcher; Michael M. Wolf

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Sparse matrix-vector multiplication (SpMV) is the core operation in many common network and graph analytics, but poor performance of the SpMV kernel handicaps these applications. This work quantifies the effect of matrix structure on SpMV performance, using Intel's VTune tool for the Sandy Bridge architecture. Two types of sparse matrices are considered: finite difference (FD) matrices, which are structured, and R-MAT matrices, which are unstructured. Analysis of cache behavior and prefetcher...

Topics: Distributed, Parallel, and Cluster Computing, Performance, Numerical Analysis, Computing Research...

Source: http://arxiv.org/abs/1407.8168

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4.0

Jun 30, 2018
06/18

by
Siddharth Karumanchi; Stefano Mancini; Andreas Winter; Dong Yang

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We initiate the study of passive environment-assisted communication via a quantum channel, modeled as a unitary interaction between the information carrying system and an environment. In this model, the environment is controlled by a benevolent helper who can set its initial state such as to assist sender and receiver of the communication link. (The case of a malicious environment, also known as jammer, or arbitrarily varying channel, is essentially well-understood and comprehensively...

Topics: Quantum Physics, Mathematics, Computing Research Repository, Information Theory

Source: http://arxiv.org/abs/1407.8160

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9.0

Jun 30, 2018
06/18

by
S. A. Mikhailov

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A quantum theory of the third-harmonic generation in graphene is presented. An analytical formula for the nonlinear conductivity tensor $\sigma^{(3)}_{\alpha\beta\gamma\delta}(\omega,\omega,\omega)$ is derived. Resonant maxima of the third harmonic are shown to exist at low frequencies $\omega\ll E_F/\hbar$, as well as around the frequency $\omega=2E_F/\hbar$, where $E_F$ is the Fermi energy in graphene. At the input power of a CO$_2$ laser ($\lambda\approx 10$ $\mu$m) of about 1 MW/cm$^2$ the...

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1407.8169

2
2.0

Jun 30, 2018
06/18

by
Steffen Gielen; Daniele Oriti

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In the context of group field theory condensate cosmology, we clarify the extraction of cosmological variables from the microscopic quantum gravity degrees of freedom. We show that an important implication of the second quantized formalism is the dependence of cosmological variables and equations on the quantum gravitational atomic number N (number of spin network vertices/elementary simplices). We clarify the relation of the effective cosmological equations with loop quantum cosmology,...

Topics: High Energy Physics - Theory, General Relativity and Quantum Cosmology

Source: http://arxiv.org/abs/1407.8167

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4.0

Jun 30, 2018
06/18

by
Krzysztof Jachymski; Michał Krych; Paul S. Julienne; Zbigniew Idziaszek

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We consider a general problem of inelastic collision of particles interacting with power-law potentials. Using quantum defect theory we derive an analytical formula for the energy-dependent complex scattering length, valid for arbitrary collision energy, and use it to analyze the elastic and reactive collision rates. Our theory is applicable for both universal and non-universal collisions. The former corresponds to the unit reaction probability at short range, while in the latter case the...

Topics: Physics, Quantum Gases, Atomic Physics, Quantum Physics, Condensed Matter

Source: http://arxiv.org/abs/1407.8030

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8.0

Jun 30, 2018
06/18

by
Manpreet Singh; Tapan Mishra; Ramesh V. Pai; B. P. Das

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We obtain the complete quantum phase diagram of bosons on a two-leg ladder in the presence of attractive onsite and repulsive interchain nearest-neighbor interactions by imposing the onsite three-body constraint. We find three distinct phases; namely, the atomic superfluid (ASF), dimer superfluid (DSF), and the dimer rung insulator (DRI). In the absence of the interchain nearest-neighbor repulsion, the system exhibits a transition from the ASF to the DSF phase with increasing onsite attraction....

Topics: Quantum Gases, Condensed Matter

Source: http://arxiv.org/abs/1407.7950

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3.0

Jun 30, 2018
06/18

by
M. Salehi; S. A. Jafari

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Bismuth and its alloys provide a paradigm to realize three dimensional materials whose low-energy effective theory is given by Dirac equation in 3+1 dimensions. We study the quantum transport properties of three dimensional Dirac materials within the framework of Landauer-B\"uttiker formalism. Charge carriers in normal metal satisfying the Schr\"odinger equation, can be split into four-component with appropriate matching conditions at the boundary with the three dimensional Dirac...

Topics: Mesoscale and Nanoscale Physics, Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1407.8048

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3.0

Jun 30, 2018
06/18

by
Nektarios N. Lathiotakis; Nicole Helbig; Angel Rubio; Nikitas I. Gidopoulos

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Recently, we introduced (e-print arXiv:1407.7128) {\em local reduced density matrix functional theory} (local RDMFT), a theoretical scheme capable of incorporating static correlation effects in Kohn-Sham equations. Here, we apply local RDMFT to molecular systems of relatively large size, as a demonstration of its computational efficiency and its accuracy in predicting single-electron properties from the eigenvalue spectrum of the single-particle Hamiltonian with a local effective potential. We...

Topics: Physics, Chemical Physics

Source: http://arxiv.org/abs/1407.7939

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4.0

Jun 30, 2018
06/18

by
A. Zazunov; A. Brunetti; A. Levy Yeyati; R. Egger

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We present a comprehensive theoretical framework for the Andreev bound state population dynamics in superconducting weak links. Contrary to previous works, our approach takes into account the generated nonequilibrium distribution of the continuum quasiparticle states in a self-consistent way. As application of our theory, we show that the coupling of the superconducting contact to environmental phase fluctuations induces a charge imbalance of the continuum quasiparticle population. This...

Topics: Superconductivity, Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1407.7991

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64

Jul 30, 2014
07/14

by
Seis Dimensiones

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Obra creada por el grupo Seis DIMENSIONES

Topic: Seis Dimensiones

42
42

Oct 2, 2016
10/16

by
QACTV

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Anne Schnappinger goes over some of the events taking place at the 4-H QAC Fair, including the Opening Ceremonies on Monday, August 11.

Topics: Maryland, Centreville, Queen Anne's County TV, QACTV, Government Access TV, Community Media, PEG,...

Ya tenéis online mi séptima colaboración con el programa Ciencia al Cubo de Radio Nacional de España, Radio 5 todo noticias, en el que repaso tres de las funciones más fascinantes que realiza nuestro cerebro mientras dormimos... Por cierto, como podréis comprobar en el audio, esta colaboración cierra la temporada de Ciencia al Cubo hasta su vuelta en septiembre, después de las vacaciones... Y sí, desde Radio Nacional ya me han confirmado que cuentan con mis historias para una segunda...