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Search Results: 1 - 10 of 37485 matches for " Rodriguez Daniel "
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On the Relationship between the Pure Delay and the Natural Period of Oscillation  [PDF]
Daniel Chuk, Gustavo Rodriguez Medina
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.76046
Abstract: This paper provides a proof of the well-known relationship between the pure delay and the natural period of oscillation in industrial systems.
Administración de Dexmedetomidina a dosis por encima de la usual
Rivera,Daniel; Rodriguez,Leonardo;
Revista Colombiana de Anestesiología , 2008,
Abstract: dexmedetomidine, atthemomenthasbeen usedassedativeinseveralclinicalscenarios, and helpingin theawakeintubationsetting. due to the "off labeluse" of this medicament, one has come glimpsing a nen use as endovenous anesthetic, with the potential advantages of hemodynamic and ventilatory stability.
The Future of Houses: What Real-Estate Ads Tell About the Evolution of Single-Family Dwellings
Gabriel Rodriguez,Daniel Siret
Archnet-IJAR : International Journal of Architectural Research , 2009,
Administración de Dexmedetomidina a dosis por encima de la usual
Daniel Rivera,Leonardo Rodriguez
Revista Colombiana de Anestesiología , 2008,
Abstract: La dexmedetomidina actualmente ha sido utilizada como sedante en varios escenarios clínicosy joadyuvante en el escenario de la intubación despierto. Debido al uso "porfuera de las indicaciones" de este medicamento, se ha venido vislumbrando un posible uso como anestésico endovenososoc las potenciales ventajas de estabilidad hemodinámicay ventilatoria. Dexmedetomidine, atthemomenthasbeen usedassedativeinseveralclinicalscenarios, and helpingin theawakeintubationsetting. Due to the "off labeluse" of this medicament, one has come glimpsing a nen use as endovenous anesthetic, with the potential advantages of hemodynamic and ventilatory stability.
Periodic behaviour of nonlinear second order discrete dynamical systems
Daniel Maroncelli,Jesus Rodriguez
Mathematics , 2015, DOI: 10.1080/10236198.2015.1083016
Abstract: In this work we provide conditions for the existence of periodic solutions to nonlinear, second-order difference equations of the form \begin{equation*} y(t+2)+by(t+1)+cy(t)=g(t,y(t)) \end{equation*} where $c\neq 0$, and $g:\mathbb{Z}^+\times\mathbb{R}\to \mathbb{R}$ is continuous and periodic in $t$. Our analysis uses the Lyapunov-Schmidt reduction in combination with fixed point methods and topological degree theory.
Polytope conditioning and linear convergence of the Frank-Wolfe algorithm
Javier Pena,Daniel Rodriguez
Mathematics , 2015,
Abstract: It is known that the gradient descent algorithm converges linearly when applied to a strongly convex function with Lipschitz gradient. In this case the algorithm's rate of convergence is determined by condition number of the function. In a similar vein, it has been shown that a variant of the Frank-Wolfe algorithm with away steps converges linearly when applied a strongly convex function over a polytope. In a nice extension of the unconstrained case, the algorithm's rate of convergence is determined by the product of the condition number of the function and a certain condition number of the polytope. We shed new light into the latter type of polytope conditioning. In particular, we show that previous and seemingly different approaches to define a suitable condition measure for the polytope are essentially equivalent to each other. Perhaps more interesting, they can all be unified via a parameter of the polytope that formalizes a key premise linked to the algorithm's linear convergence. We also give new insight into the linear convergence property. For a convex quadratic objective, we show that the rate of convergence is determined by the condition number of a suitably scaled polytope.
A Social Network for Societal-Scale Decision-Making Systems
Marko Rodriguez,Daniel Steinbock
Computer Science , 2004,
Abstract: In societal-scale decision-making systems the collective is faced with the problem of ensuring that the derived group decision is in accord with the collective's intention. In modern systems, political institutions have instatiated representative forms of decision-making to ensure that every individual in the society has a participatory voice in the decision-making behavior of the whole--even if only indirectly through representation. An agent-based simulation demonstrates that in modern representative systems, as the ratio of representatives increases, there exists an exponential decrease in the ability for the group to behave in accord with the desires of the whole. To remedy this issue, this paper provides a novel representative power structure for decision-making that utilizes a social network and power distribution algorithm to maintain the collective's perspective over varying degrees of participation and/or ratios of representation. This work shows promise for the future development of policy-making systems that are supported by the computer and network infrastructure of our society.
Daniel Rodriguez de Carvalho Pinheiro
Revista Eletr?nica de Ciência Administrativa - RECADM , 2003, DOI: 10.5329/436
Physics of beer tapping
Javier Rodriguez-Rodriguez,Almudena Casado-Chacon,Daniel Fuster
Physics , 2014, DOI: 10.1103/PhysRevLett.113.214501
Abstract: The popular bar prank known in colloquial English as beer tapping consists in hitting the top of a beer bottle with a solid object, usually another bottle, to trigger the foaming over of the former within a few seconds. Despite the trick being known for long time, to the best of our knowledge, the phenomenon still lacks scientific explanation. Although it seems natural to think that shock-induced cavitation enhances the diffusion of CO$_2$ from the supersaturated bulk liquid into the bubbles by breaking them up, the subtle mechanism by which this happens remains unknown. Here we show that the overall foaming-over process can be divided into three stages where different physical phenomena take place in different time-scales, namely: bubble-collapse (or cavitation) stage, diffusion-driven stage and buoyancy-driven stage. In the bubble-collapse stage, the impact generates a train of expansion-compression waves in the liquid that leads to the fragmentation of pre-existing gas cavities. Upon bubble fragmentation, the sudden increase of the interface-area-to-volume ratio enhances mass transfer significantly, which makes the bubble volume grow by a large factor until CO$_2$ is locally depleted. At that point buoyancy takes over, making the bubble clouds rise and eventually form buoyant vortex rings whose volume grows fast due to the feedback between the buoyancy-induced rising speed and the advection-enhanced CO$_2$ transport from the bulk liquid to the bubble. The physics behind this explosive process might also be connected to some geological phenomena.
Sensitivity and Specificity of Pre-Operative Staging of the Axilla When Using OSNA in Breast Cancer Patients  [PDF]
Jonathan D. Horsnell, Kashif Choudhry, Daniel Urriza-Rodriguez, Alex Valencia, Zenon Rayter
Advances in Breast Cancer Research (ABCR) , 2016, DOI: 10.4236/abcr.2016.53012
Abstract: Introduction:All patients with a new diagnosis of breast cancer undergo pre-operative axillary ultrasound (US) and biopsy to identify axillary metastases. The efficacy of this approach at identifying metastatic disease is particularly important if an intra-operative technique of assessment is used. This paper is the first to report the sensitivity and specificity of pre-operative axillary ultrasound within the context of the routine use of OSNA (one step nucleic acid amplification) (Sysmex, Japan), a molecular assay technique for the intra-operative analysis of axillary lymph nodes. This knowledge will help counsel patients prior to the procedure and inform economic analysis of the implications of this approach. Method: Consecutive patients diagnosed with invasive breast cancer between July 2009 and February 2012 at a single centre were identified by interrogation of MDT (multi disciplinary team) and surgical databases and a prospective database of all patients undergoing OSNA analysis. A standardised data collection sheet was used to record tumour characteristics and the nodal stage for each patient. These results were used to document the efficacy of preoperative US and biopsy of the axilla in comparison to intraoperative OSNA analysis. The data were then compared between two groups of patients, those whose nodes had been assessed using OSNA (the OSNA group) and those nodes had been tested using standard histopathological examination (the non-OSNA group). Results: A total of 377 eligible patients were identified. Within the OSNA group (n = 240) the sensitivity of pre-operative axillary US was 29% which rose to 41% when micro-metastases were excluded. A specificity and positive predictive value of 100% was recorded. The negative predictive value was 74%. There were no significant differences to the efficacy when the nodes were assessed with standard histopathology. The detection rate of micro-metastases was significantly higher in the OSNA group (P = 0.001), but there was no statistically significant difference in those with macro-metastases (P = 0.457). Conclusions: There are no significant differences in the sensitivity and specificity achieved by pre-operative axillary US when compared to either post operative histopathology or OSNA molecular analysis as the gold standard. OSNA, however, does increase the detection of micro-metastases.
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