Strandings of Leatherback turtles (Dermochelys coriacea) along the western and southern coast of the Gulf of Venezuela

Leatherback Turtle (Dermochelys coriacea) strandings in the Gulf of Venezuela (GV) were evaluated to estimate: (1) the area of most frequent strandings; (2) the period of greatest strandings; and (3) the number of strandings that exhibit evidence of human interaction. We gathered data from three sources: (1) scientific patrols; (2) Opportune Information Network (in Spanish Red de Aviso Oportuno – RAO); and (3) contact with local non-governmental organization. At each stranding site, we collected information about the location, date, specimen condition, and, when possible, the midline curved carapace length (CCL) and curved carapace width (CCW). We categorized the cause of strandings as either interaction with human activities or an unknown cause. We recorded 57 Leatherback Turtle strandings along the GV coast during 2001–2007. The mean CCL was 126.2 cm ± 16.5 (range 86–168 cm, n = 47) and the mean CCW was 99.1cm ± 12.6 (range 83–109 cm, n = 47). Strandings were mainly distributed along the North and South coast (49% and 46%, respectively), and were mostly concentrated between February and March (51%). Over half (55%) of the strandings showed signs of interaction with human activities. Establishing a relationship between fisheries and strandings in the GV remains difficult. Although the stranding number reported is low when compared to other localities, our results represent a minimum estimate of mortality. A management plan is crucial for mitigating possible impacts of artisanal fisheries in the region

Consenso e pós-consenso de Washington: duas gerações de reformas incompletas

There is a missing dimension on the economic reforms of the Washington consensus, as well as in the institutional turn of the post-washington consensus: the political and social aspects. policy harmonization of both generations of reforms has failed to acknowledge the political centrality of the actors (agencies) on those processes in which they are active, ignoring the intentional, contingent and unpredictable character they manage to give it.La dimensión perdida de las reformas emprendidas tanto por el énfasis macro-económico del Consenso de Washington, como por el tenor institucional del pos-Consenso radica en lo político y lo social. La pretensión de armonización de ambas generaciones de reformas ha fallado en reconocer la centralidad política de los actores en los procesos en los que toman parte activa, ignorando el carácter intencional, contingente e impredecible que logran imprimirle.A dimensão perdida das reformas empreendidas tanto pela ênfase macro-econômica do Consenso de Washington, como pelo teor institucional do pós-Consenso, radica nas dimensões políticas e sociais. O objetivo de harmonizar as duas gerações de reformas falhou em reconhecer a centralidade política dos atores nos processos nos quais têm parte ativa e ignora a natureza intencional, contingente e imprevisível que consegue imprimir-lhe

Endurance of quantum coherence due to particle indistinguishability in noisy quantum networks

Quantum coherence, the physical property underlying fundamental phenomena such as multi-particle interference and entanglement, has emerged as a valuable resource upon which modern technologies are founded. In general, the most prominent adversary of quantum coherence is noise arising from the interaction of the associated dynamical system with its environment. Under certain conditions, however, the existence of noise may drive quantum and classical systems to endure intriguing nontrivial effects. In this vein, here we demonstrate, both theoretically and experimentally, that when two indistinguishable non-interacting particles co-propagate through quantum networks affected by non-dissipative noise, the system always evolves into a steady state in which coherences accounting for particle indistinguishabilty perpetually prevail. Furthermore, we show that the same steady state with surviving quantum coherences is reached even when the initial state exhibits classical correlations.Comment: arXiv admin note: substantial text overlap with arXiv:1709.0433

Nonlinear coherent states for the Susskind-Glogower operators

We construct nonlinear coherent states for the Susskind-Glogower operators by the application of the displacement operator on the vacuum state. We also construct nonlinear coherent states as eigenfunctions of a Hamiltonian constructed with the Susskind-Glogower operators. We generalize the solution of the eigen- function problem to an arbitrary |mi initial condition. To analyze the obtained results, we plot the Husimi Q function, the photon number probability distribution and the Mandel Q-parameter. For both cases, we find that the constructed states exhibit interesting nonclassical features, such as amplitude squeezing and quantum interferences due to a self-splitting into two coherent-like states. Additionally, we show that non- linear coherent states may be modeled by propagating light in semi-infinite arrays of optical fibers.Comment: 22 pages, 8 figures, Conference Quantum Optics V, Published as: REVISTA MEXICANA DE F\'ISICA S 57 (3) 133-14

Technology strategy and new technology based firms

A study of the competitive advantage in successful New Technology Based Firms found that their technology strategy played a key role for making these companies improve their competitive advantage. We appealed to the grounded theory as a qualitative strategy to build theory, and to the exploratory case-study methodology to effectively understand this phenomenon in specific contexts as the one represented by small entrepreneurial firms in comparison with large established firms. A suitable comprehension of the different contexts required of a view of technology strategy that is more dynamic than those typically available. We build an explanatory model which integrates and groups the propositions previously developed. We view the study as exploratory to a class of studies aimed at understanding the technology strategy process in new ventures.Postprint (published version

TELEVISIÓN DIGITAL: UN NUEVO CAMPO DE ACCIÓN, NUEVAS OPORTUNIDADES.

En el presente artículo podemos encontrar un estudio de lo que es la televisión digital, los diferentes estándares que son utilizados en el orden mundial, las implicaciones de su implementación, algunos aspectos técnicos de cada uno de los estándares; relacionando todo esto con el proceso que se realiza en la actualidad en el país con miras a su implementación. Es de resaltar la importancia que este tema reviste para los estudiosos de la informática, la electrónica, la telemática y todas las áreas afines a las Tecnologías de la Información y las Telecomunicaciones, comúnmente conocidas como TIC

OBJETOS: LO REAL, LO ABSTRACTO Y LO LÓGICO. BREVE INTRODUCCIÓN

Se hace una breve introducción a lo que es la programación orientada a objetos, partiendo de un análisis del entorno y de la experiencia cotidiana, para llegar a abordar un problema y plantear una solución desde la perspectiva de la programación orientada a objetos utilizando como lenguaje de programación el C++

Efecto de la aplicación intrauterina de ozono sobre la migración de neutrófilos y la endometritis subclínica en ganado lechero

The objective was to determine whether an ozonized saline solution (O3SS) increases endometrial polymorphonuclear neutrophils (PMNN) (Exp 1) and to challenge the preventive effect of O3SS on subclinical endometritis (SCE) (Exp 2). In Exp 1, 38 primiparous Holstein cows were used. Cows with (WHM) and no history of postpartum metritis (NHM) were included; they were then divided into control (CTRL, saline solution) or O3SS (6.7 ± 0.3 ppm) subgroups. At 55 d postpartum, 50 ml of CTRL or O3SS was applied intrauterinely and at 48 h, the quantity of PMNN was recorded by endometrial cytology. In Exp 2, 26 primiparous NHM Holstein cows were used. The cows were randomly distributed in CTRL or O3SS. Two doses of 50 ml were administered with an interval of 7 d (first application 11.3 ± 0.4 d postpartum). At d 30 postpartum, SCE (≥6 % PMNN) was diagnosed. WHM cows had higher numbers of endometrial PMNN compared to NHM cows (13.9 ± 6.2 vs 1.0 ± 0.46, P0.05) and the NHM-CTRL and NHM-O3SS groups (0.1 ± 0.1 and 1.8 ± 4.8, P>0.05) were not different. A statistical trend (P=0.09) of lower percentage of SCE was observed in the CTRL group compared to O3SS (15.4 and 46.2 %, respectively). In conclusion, transcervical O3SS does not increase the number of endometrial PMNN and preventive treatment with O3SS applied to NHM cows did not decrease SCE. The results suggest a possible anti-inflammatory effect of the ionized saline solution treatment.El objetivo fue determinar si una solución salina ozonizada (SSO3) incrementa los neutrófilos polimorfonucleares (NPMN) endometriales (Exp 1) y desafiar el efecto preventivo de SSO3 sobre la endometritis subclínica (ESC) (Exp 2). En el Exp 1 se utilizaron 38 vacas Holstein primíparas. Se incluyeron vacas con (CAM) y sin antecedentes de metritis postparto (SAM); posteriormente se repartieron en subgrupos control (CTRL, solución salina) o SSO3 (6.7 ± 0.3 ppm). A los 55 días postparto se aplicó 50 ml de CTRL o SSO3 intrauterinamente y a las 48 h se registró la cantidad de NPMN por citología endometrial. En el Exp 2 se utilizaron 26 vacas Holstein primíparas SAM. Las vacas se repartieron aleatoriamente en CTRL o SSO3. Se administraron dos dosis de 50 ml con intervalo de 7 días (primera aplicación 11.3 ± 0.4 días postparto). Al día 30 postparto se diagnosticó ESC (≥6% NPMN). Las vacas CAM tuvieron mayor número de NPMN endometriales comparado con vacas SAM (13.9 ± 6.2 vs 1.0±0.46, P0.05) y SAM-CTRL y SAM-SSO3 (0.1 ± 0.1 y 1.8 ± 4.8, P>0.05) no fueron diferentes. Se observó una tendencia estadística (P=0.09) de menor porcentaje de ESC en grupo CTRL comparado con SSO3 (15.4 y 46.2 %, respectivamente). En conclusión, la SSO3 por vía transcervical no incrementa el número de NPMN endometriales y el tratamiento preventivo con SSO3 aplicado a vacas SAM no disminuyó la ESC. Los resultados sugieren un posible efecto antiinflamatorio del tratamiento solución salina ionizada

Noise-assisted energy transport in electrical oscillator networks with off-diagonal dynamical disorder

Noise is generally thought as detrimental for energy transport in coupled oscillator networks. However, it has been shown that for certain coherently evolving systems, the presence of noise can enhance, somehow unexpectedly, their transport efficiency; a phenomenon called environment-assisted quantum transport (ENAQT) or dephasing-assisted transport. Here, we report on the experimental observation of such effect in a network of coupled electrical oscillators. We demonstrate that by introducing stochastic fluctuations in one of the couplings of the network, a relative enhancement in the energy transport efficiency of 22.5 ± 3.6% can be observed.Peer ReviewedPostprint (published version