Interaction effects on dynamical localization in driven helium

Dynamical localization prevents driven atomic systems from fast fragmentation by hampering the excitation process. We present numerical simulations within a collinear model of microwave-driven helium Rydberg atoms and prove that dynamical localization survives the impact of electron-electron interaction, even for doubly excited states in the presence of fast autoionization. We conclude that the effect of electron-electron repulsion on localization can be described by an appropriate rescaling of the atomic level density and of the external field with the strength of the interaction.Comment: 5 pages, 4 figure

IS A TAX CUT ON CULTURAL GOODS CONSUMPTION ACTUALLY DESIRABLE?:A MICROSIMULATION ANALYSIS

Proposals for tax cuts on cultural goods represent an ongoing debate in cultural policy. The main aim of this paper is to shed some light on this debate using microsimulation tools. First, we have estimated an Almost Ideal Demand System for nineteen different groups of goods, including cultural goods. Expenditure and price elasticities have been obtained from this model. Using this information, three alternatives cuts in the V.A.T. rate on cultural goods have been microsimulated and evaluated in terms of revenue and welfare. These types of fiscal reforms will lead to welfare and efficiency gains that can be described as regressive.Microsimulation, tax reforms, cultural consumption, welfare

Analysis of Renewable Energy Policies Related to Repowering the Wind Energy Sector: the Spanish Case

In countries that started early with wind energy, the old wind turbines were located in places where the wind is often very good. Since the best places in which the wind is concerned are occupied by old wind turbines (with lower capacity than the more recent ones) the trend is to start replacing old turbines with new ones. With repowering, the first generation of wind turbines can be replaced by modern multi-megawatt wind turbines. The aim of this article is to analyze energy policies in the Spanish energy sector in the repowering of wind farms from the viewpoint of the current situation of the wind energy sector. The approach presented in this article is meant to explain what have been the policies related to the repowering sector making a brief analysis of the spectrum of different stimulii that are demanded by the market analyzing also the future perspectives of the repowering sector by establishing the new opportunities based on the new published regulations

Combining Nearest Neighbor Predictions and Model-Based Predictions of Realized Variance: Does it Pay?

The increasing availability of intraday financial data has led to improvements in daily volatility forecasting through long-memory models of realized volatility. This paper demonstrates the merit of the non-parametric Nearest Neighbor (NN) approach for S&P 100 realized variance forecasting. A priori the NN approach is appealing because it can reproduce complex dynamic dependencies while largely avoiding misspecification and parameter estimation uncertainty, unlike model-based methods. We evaluate the forecasts through straddle trading profitability metrics and using conventional statistical accuracy criteria. The ranking of individual forecasts confirms that statistical accuracy does not have a one-to-one mapping into profitability. In turbulent markets, the NN forecasts lead to higher risk-adjusted profitability even though the model-based forecasts are statistically superior. In both calm and turbulent market conditions, the directional combination of NN and model-based forecasts is more profitable than any of the individual forecasts

Extracting partial decay rates of helium from complex rotation: autoionizing resonances of the one-dimensional configurations

Partial autoionization rates of doubly excited one-dimensional helium in the collinear Zee and eZe configuration are obtained by means of the complex rotation method. The approach presented here relies on a projection of back-rotated resonance wave functions onto singly ionized $\textrm{He}^{+}$ channel wave functions and the computation of the corresponding particle fluxes. In spite of the long-range nature of the Coulomb potential between the electrons and the nucleus, an asymptotic region where the fluxes are stationary is clearly observed. Low-lying doubly excited states are found to decay predomintantly into the nearest single-ionization continuum. This approach paves the way for a systematic analysis of the decay rates observed in higher-dimensional models, and of the role of electronic correlations and atomic structure in recent photoionization experiments

Modeling of the mechano-chemical behavior of the nuclear pore complex: current research and perspectives

Recent evidence suggests that mechanical deformation of the cell nucleus regulates the nuclear import of the transcriptional activators of genes involved in primary physiological cell responses such as stem cell differentiation. In addition, this nuclear mechanosensing response is de-regulated in pathological states, such as cancer and neurodegeneration. One hypothesis that could greatly advance the field is that the deformation of the nuclear envelope activates nuclear pore complexes through a direct mechanical link. The understanding of this possible mechanism for nuclear pore complex stretch-activation entails studying the mechanical connection of this complex to the nuclear envelope at the nanoscale. The nanomechanics of the nuclear pore complex is thus emerging as a novel research field, bridging nanoscience with nanotechnology. This review examines the frontier of research methodologies that are potentially useful for building a computational model of this interaction. This includes, for example, electron tomography to assess the geometrical features of the nuclear pore complex and nanoindentation to estimate its mechanical properties and that of the nuclear envelope. In order to summarize the state-of-the-art and perspectives in the field of NPC nanomechanics, this review covers highly interdisciplinary experimental and theoretical research methodologies pertaining to the fields of physics, chemistry, biology, materials and mechanics

Геофизический прогноз нового перспективного участка в партизанском золоторудном узле (Енисейский кряж)

Рассматривается обоснование аэрогеофизических признаков золото-сульфидно-вкрапленного оруденения на новом участке в Партизанском рудном узле -Подголечном, предположительно аналогичного месторождению Благодатному Северо-Енисейского района (Енисейский кряж), по результатам съемки 2012 г. (магнитометрия, электроразведка ДИП-А, гамма-спектрометрия) масштаба 1:10000

[BOCIO FETAL OVINO: ESTUDIO DE CASO EN MÉXICO]

En un rebaño ovino de pequeña escala, localizado en el Estado de México, con ocho ovejas y un semental, de las cuales cuatro ovejas presentaron signos clínicos de bocio endémico, dos fetos abortados fueron usados para un estudio de diagnóstico. De ambos fetos, muestras de la glándula tiroides fueron usadas para la evaluación histopatológica, y muestras de hígado, corazón, riñón y músculo esquelético fueron usadas para medir el contenido de selenio. En el suero sanguíneo de las ovejas se midió el perfil de las hormonas tiroideas por la prueba de ELISA. En ambos fetos hubo un aumento de tamaño de la glándula tiroides (6-8 cm), con consistencia firme y color rojo intenso, así como escases de vellón y edema subcutáneo; también hubo hiperplasia e hipertrofia de las células foliculares de la tiroides, con aspecto cuboide, expansión difusa, contorno irregular y distensión con presencia de vacuolas y abundante coloide eosinofílico. Las concentraciones de selenio en el hígado y riñón fueron bajas (0.25 y 0.90 ppm). En las ovejas los contenidos de las hormonas tiroxina (T4) y triyodotironina (T3) fueron deficientes (0.48±0.08 y 4.14±0.29 μg dL-1), y la relación (T4:T3) fue muy amplia (1:8.6 μg dL-1). Se concluye que los corderos sufrieron de bocio coloide. Las concentraciones de hormonas tiroideas en las ovejas fueron bajas y confirmaron un metabolismo tiroideo alterado; adicionalmente, el bocio puede ser agravado por la deficiencia de selenio

Laparoscopic nephrectomy for ex-vivo correction of renal artery aneurism and auto transplant

INTRODUCTION AND OBJECTIVES: Renal artery aneurism are a rare condition, with a prevalence of 0.09% of the population. The outcomes and clinical management of this patients depend on the presence of symptoms and subsequent risk of rupture. Most patients are managed by endovascular techniques, but difficult cases may present a challenge to urologists. METHODS: We present a case of a 35 year old female, history of high blood pressure with the diagnosis of a left renal artery aneurism with a diameter of 27 mm. The patient was evaluated by vascular surgery, was unsuitable for endovascular treatment and was submitted to a laparoscopic left nephrectomy with correction of the aneurism ex-vivo and the kidney was transplanted to the left iliac region. RESULTS: Operative time was 150 minutes and the warm ischemia time was 160 seconds. Blood loss was estimated in 80 mL with a hematocrit drop of 2% post operative. Drainage and vesical catheter were removed at day 2 and 6 post-operative, respectively. Post operative creatinine clearance was comparable to the pre operative (Post - 95 vs. Pre - 98 mL/min/1.73m2) The follow up is 15 months and the patients has a functioning kidney and had a normalization of the blood pressure. CONCLUSIONS: In experienced centers, laparoscopic nephrectomy with subsequent autotransplantion can be a safe and effective option in the management of specific conditions. This case presents a possible way to treat renal artery aneurisms that can’t be managed by endovascular procedures