Review and comparison of effective delayed neutron fraction calculation methods with Monte Carlo codes

The calculation of the effective delayed neutron fraction, beff , with Monte Carlo codes is a complex task due to the requirement of properly considering the adjoint weighting of delayed neutrons. Nevertheless, several techniques have been proposed to circumvent this difficulty and obtain accurate Monte Carlo results for beff without the need of explicitly determining the adjoint flux. In this paper, we make a review of some of these techniques; namely we have analyzed two variants of what we call the k-eigenvalue technique and other techniques based on different interpretations of the physical meaning of the adjoint weighting. To test the validity of all these techniques we have implemented them with the MCNPX code and we have benchmarked them against a range of critical and subcritical systems for which either experimental or deterministic values of beff are available. Furthermore, several nuclear data libraries have been used in order to assess the impact of the uncertainty in nuclear data in the calculated value of beff .

Hardware timestamping for image acquisition system based on FlexRIO and IEEE 1588 v2 Standard

Current fusion devices consist of multiple diagnostics and hundreds or even thousands of signals. This situation forces on multiple occasions to use distributed data acquisition systems as the best approach. In this type of distributed systems, one of the most important issues is the synchronization between signals, so that it is possible to have a temporal correlation as accurate as possible between the acquired samples of all channels. In last decades, many fusion devices use different types of video cameras to provide inside views of the vessel during operations and to monitor plasma behavior. The synchronization between each video frame and the rest of the different signals acquired from any other diagnostics is essential in order to know correctly the plasma evolution, since it is possible to analyze jointly all the information having accurate knowledge of their temporal correlation. The developed system described in this paper allows timestamping image frames in a real-time acquisition and processing system using 1588 clock distribution. The system has been implemented using FPGA based devices together with a 1588 synchronized timing card (see Fig.1). The solution is based on a previous system [1] that allows image acquisition and real-time image processing based on PXIe technology. This architecture is fully compatible with the ITER Fast Controllers [2] and offers integration with EPICS to control and monitor the entire system. However, this set-up is not able to timestamp the frames acquired since the frame grabber module does not present any type of timing input (IRIG-B, GPS, PTP). To solve this lack, an IEEE1588 PXI timing device its used to provide an accurate way to synchronize distributed data acquisition systems using the Precision Time Protocol (PTP) IEEE 1588 2008 standard. This local timing device can be connected to a master clock device for global synchronization. The timing device has a buffer timestamp for each PXI trigger line and requires tha- a software application assigns each frame the corresponding timestamp. The previous action is critical and cannot be achieved if the frame rate is high. To solve this problem, it has been designed a solution that distributes the clock from the IEEE 1588 timing card to all FlexRIO devices [3]. This solution uses two PXI trigger lines that provide the capacity to assign timestamps to every frame acquired and register events by hardware in a deterministic way. The system provides a solution for timestamping frames to synchronize them with the rest of the different signals.

Pulsatile blood flow interaction with arterial walls of aorta : autoregulation and impedance pressure boundary condition and its biomedical applications

Para las decisiones urgentes sobre intervenciones quirúrgicas en el sistema cardiovascular se necesitan simulaciones computacionales con resultados fiables y que consuman un tiempo de cálculo razonable. Durante años los investigadores han trabajado en diversos métodos numéricos de cálculo que resulten atractivos para los cirujanos. Estos métodos, precisos pero costosos desde el punto de vista del coste computacional, crean un desajuste entre la oferta de los ingenieros que realizan las simulaciones y los médicos que operan en el quirófano. Por otra parte, los métodos de cálculo más simplificados reducen el tiempo de cálculo pero pueden proporcionar resultados no realistas. El objetivo de esta tesis es combinar los conceptos de autorregulación e impedancia del sistema circulatorio, la interacción flujo sanguíneo-pared arterial y modelos geométricos idealizados tridimensionales de las arterias pero sin pérdida de realismo, con objeto de proponer una metodología de simulación que proporcione resultados correctos y completos, con tiempos de cálculo moderados. En las simulaciones numéricas, las condiciones de contorno basadas en historias de presión presentan inconvenientes por ser difícil conocerlas con detalle, y porque los resultados son muy sensibles ante pequeñas variaciones de dichas historias. La metodología propuesta se basa en los conceptos de autorregulación, para imponer la demanda de flujo aguas abajo del modelo en el ciclo cardiaco, y la impedancia, para representar el efecto que ejerce el flujo en el resto del sistema circulatorio sobre las arterias modeladas. De este modo las historias de presión en el contorno son resultados del cálculo, que se obtienen de manera iterativa. El método propuesto se aplica en una geometría idealizada del arco aórtico sin patologías y en otra geometría correspondiente a una disección Stanford de tipo A, considerando la interacción del flujo pulsátil con las paredes arteriales. El efecto de los tejidos circundantes también se incorpora en los modelos. También se hacen aplicaciones considerando la interacción en una geometría especifica de un paciente anciano que proviene de una tomografía computarizada. Finalmente se analiza una disección Stanford tipo B con tres modelos que incluyen la fenestración del saco. Clinicians demand fast and reliable numerical results of cardiovascular biomechanic simulations for their urgent pre-surgery decissions. Researchers during many years have work on different numerical methods in order to attract the clinicians' confidence to their colorful contours. Though precise but expensive and time-consuming methodologies create a gap between numerical biomechanics and hospital personnel. On the other hand, simulation simplifications with the aim of reduction in computational time may cause in production of unrealistic outcomes. The main objective of the current investigation is to combine ideas such as autoregulation, impedance, fluid-solid interaction and idealized geometries in order to propose a computationally cheap methodology without excessive or unrealistic simplifications. The pressure boundary conditions are critical and polemic in numerical simulations of cardiovascular system, in which a specific arterial site is of interest and the rest of the netwrok is neglected but represented by a boundary condition. The proposed methodology is a pressure boundary condition which takes advantage of numerical simplicity of application of an imposed pressure boundary condition on outlets, while it includes more sophisticated concepts such as autoregulation and impedance to gain more realistic results. Incorporation of autoregulation and impedance converts the pressure boundary conditions to an active and dynamic boundary conditions, receiving feedback from the results during the numerical calculations and comparing them with the physiological requirements. On the other hand, the impedance boundary condition defines the shapes of the pressure history curves applied at outlets. The applications of the proposed method are seen on idealized geometry of the healthy arotic arch as well as idealized Stanford type A dissection, considering the interaction of the arterial walls with the pulsatile blood flow. The effect of surrounding tissues is incorporated and studied in the models. The simulations continue with FSI analysis of a patient-specific CT scanned geometry of an old individual. Finally, inspiring of the statistic results of mortality rates in Stanford type B dissection, three models of fenestrated dissection sac is studied and discussed. Applying the developed boundary condition, an alternative hypothesis is proposed by the author with respect to the decrease in mortality rates in patients with fenestrations.

Cell Cycle–regulated Transcription in Fission Yeast: Cdc10–Res Protein Interactions during the Cell Cycle and Domains Required for Regulated Transcription

In Schizosaccharomyces pombe the MBF (DSC1) complex mediates transcriptional activation at Start and is composed of a common subunit called Cdc10 in combination with two alternative DNA-binding partners, Res1 and Res2. It has been suggested that a high-activity MBF complex (at G1/S) is switched to a low-activity complex (in G2) by the incorporation of the negative regulatory subunit Res2. We have analyzed MBF protein–protein interactions and find that both Res proteins are associated with Cdc10 throughout the cell cycle, arguing against this model. Furthermore we demonstrate that Res2 is capable of interacting with a mutant form of Cdc10 that has high transcriptional activity. It has been shown previously that both Res proteins are required for periodic cell cycle–regulated transcription. Therefore a series of Res1–Res2 hybrid molecules was used to determine the domains that are specifically required to regulate periodic transcription. In Res2 the nature of the C-terminal region is critical, and in both Res1 and Res2, a domain overlapping the N-terminal ankyrin repeat and a recently identified activation domain is important for mediating cell cycle–regulated transcription.

Competition for Microtubule-binding with Dual Expression of Tau Missense and Splice Isoforms

How tau mutations lead to neurodegeneration is unknown but may be related to altered microtubule binding properties of mutant tau protein. The tendency for the mutations to cluster around the microtubule-binding domain of tau or to alter the ratios of those splice isoforms that affect binding supports the view that the tau/microtubule interaction is critical and finely regulated. In cells transfected with both mutant and wild-type tau isoforms fused to either yellow fluorescent protein or cyan fluorescent protein we can observe tau fusion proteins that differ by a single amino acid or by the inclusion or exclusion of exon 10. With coexpression of mutant and wild-type tau, the mutant isoform appears diffuse throughout the cytoplasm; however, when mutant tau is expressed alone, it appears mostly bound to the microtubules. Dual imaging of the three- and four-repeat tau isoforms indicated that the expression of four-repeat tau displaced three-repeat tau from the microtubules. These results suggest that altered kinetic competition among the isoforms for microtubule binding could be a disease precipitant.

Natural killer and lymphokine-activated killer cells require granzyme B for the rapid induction of apoptosis in susceptible target cells.

Granzyme (Gzm) B-deficient mice obtained by gene targeting were used to assess the role of Gzm B in the mechanisms used by natural killer (NK) and lymphokine-activated killer (LAK) cells to destroy target cells. Gzm B-/- NK cells, LAK cells, and cytotoxic T lymphocytes (CTL) all are defective in their ability to rapidly induce DNA fragmentation/apoptosis in susceptible target cells. This defect can be partially corrected with long incubation times of effector and target cells. Moreover, Gzm B-/- NK cells (but not CTL or LAK cells) exhibit a defect in 51Cr release from susceptible target cells. This 51Cr release defect in Gzm B-deficient NK cells is also not overcome by prolonged incubation times or high effector-to-target cell ratios. We conclude that Gzm B plays a critical and nonredundant role in the rapid induction of DNA fragmentation/apoptosis by NK cells, LAK cells, and CTL. Gzm B may have an additional role in NK cells (but not in CTL or LAK cells) for mediating 51Cr release.

Representational Subversions and the Limits of Postcoloniality: Shahzia Sikander's Strategic Contemporaneity

Transnational artist Shahzia Sikander challenges the limitations of Edward Said's postcolonial emphasis on secular humanism by deploying the heterogeneous traditions of South Asian miniature painting while strategically drawing on tradition to critique contemporaneity. Through a palimpsest process of composition, Sikander reincorporates the unknown and silenced histories implicit in the tradition of miniature painting to create social imaginaries with motifs that draw on the diverse traditions of South Asian religions and aesthetics to create a subversive politics of remembering wherein alternative images of cosmopolitanism emerge. Through a sustained analysis, this dissertation demonstrates how these alternative traditions interrogate and critique the limitations of postcolonial theory. Particularly important to this critique are some recent approaches of Third World feminists that highlight the limitations of secular humanism implicit in much of postcolonial critique. Sikander's compositions mirror these approaches as her motifs of the feminine become an intervention into the spiritual emptiness and ethical confusions of contemporaneity. In effect, Sikander's work is an intervention, a warning, and a plea for the re-invention of positive alternatives as her images embody and facilitate a critical and daring consciousness that is necessary to both our social and spiritual well-being.

Defining and Measuring Metrics for a Multinational Human Resources Department

Successful HR departments should support key business objectives by establishing metrics that determine the effectiveness of their processes. Functions such as recruiting, benefits, and training are processes that should have metrics. Understanding who measures what, when, and how often is the first step in measuring how much it costs to run HR. The next step is determining which processes are most critical, and then determining the metrics that fit the business needs. Slight adjustments will need to be made as business needs change, but the process for measuring outcomes should not change. This paper will focus on multinational corporations that employ at least ten thousand employees and have a ratio of one HR professional to every hundred fulltime equivalents (FTEs).

Outsourcing and strategy in Spanish town halls: a field study

Purpose – This study seeks to analyse the links between strategies, structures and processes in the case of the largest Spanish town halls, using the Miles and Snow's models about organisational strategies, and asking the following questions: “What is the situation of municipal services' outsourcing in the largest Spanish town halls?”; “Do Spanish town halls follow the strategies suggested in Miles and Snow's model?”; and “Is there a relationship between the strategic position adopted by town halls and their stance on outsourcing?”. Design/methodology/approach – In order to achieve these aims a questionnaire was administered to the human resource managers in the town halls of the largest Spanish cities. Findings – The paper finds that outsourcing is a complement, which seeks to improve the services delivered, and local institutions do not resort to it due to a lack of internal resources but as a way to complement their own capabilities. Originality/value – The paper has identified three distinct strategic profiles in the town halls interviewed which coincide with the profiles that Miles and Snow call prospective, defensive and reactive strategies. It reveals that town halls which outsource to a greater extent are the ones which identify more with the prospective or reactive strategy, whereas those which outsource less are closer to the defensive strategy.

Fenomenología: una visión investigativa para enfermería

La disciplina de enfermería necesita identificarse con una filosofía que le permita otorgar un sentido interpretativo a los fenómenos sociales o individuales; y la investigación cualitativa ofrece la metodología necesaria para llevar a cabo la interpretación de los significados bajo un análisis crítico y reflexivo. El objetivo del presente trabajo fue reflexionar sobre diferentes tradiciones filosóficas en torno a la fenomenología, al explorar los pensamientos de Edmund Husserl, Martin Heidegger y Alfred Schütz. Se realizó un ensayo teórico cuyo insumo literario se obtuvo de repositorios y fuentes de datos electrónicas, se incluyeron artículos publicados de los años 2010 al 2014, se utilizaron combinaciones de ocho palabras clave y se excluyeron aquellos artículos que no mencionaron el enfoque teórico de los filósofos de interés. Se concluye que las tres perspectivas filosóficas plantean una estrategia metodológica factible de ser utilizada dentro de la investigación cualitativa en enfermería, ya sea bajo la escuela descriptiva de Husserl, la postura interpretativa de Heidegger o la visión social de Schütz.

Patenting Strategies of the EU Pharmaceutical Industry -Crossroad between Patent Law and Competition Policy. Research Papers in Law, 1/2011

From the Introduction. The pharmaceutical sector inquiry carried out by the European Commission in 2008 provides a useful framework for assessing the relationship between the patent system on the one hand and competition policy and law on the other hand. The pharmaceutical market is not only specifically regulated. It is also influenced by the special characteristics of the patent system which enables pharmaceutical companies engaged in research activities to enter into additional arrangements to cope with the competitive pressures of early patent application and the delays in drug approval. Patents appear difficult to reconcile with the need for sufficient and adequate access to medicines, which is why competition expectations imposed on the pharmaceutical sector are very high. The patent system and competition law are interacting components of the market, into which they must both be integrated. This can result in competition law taking a very strict view on the pharmaceutical industry by establishing strict functional performance standards for the reliance on intellectual property rights protection granted by patent law. This is in particular because in this sector the potential welfare losses are not likely to be of only monetary nature. In brief, the more inefficiencies the patent system produces, the greater the risk of an expansive application of competition law in this field. The aim of the present study is to offer a critical and objective view on the use or abuse of patents and defensive strategies in the pharmaceutical industry. It shall also seek to establish whether patents as presently regulated offer an appropriate degree of protection of intellectual property held by the economic operators in the pharmaceutical sector and whether there is a need or, for that matter, scope for improvement. A useful starting point for the present study is provided by the pharmaceutical sector competition inquiry (hereafter “the sector inquiry”) carried out by the European Commission during the first half of 2008. On 8 July 2008, the Commission adopted its Final Report pursuant to Article 17 of Regulation 1/2003 EC, revealing a series of “antitrust shortcomings” that would require further investigation1.

Improving decision-making in the EU. CHALLENGE EUROPE Issue 22 - Challenges and new beginnings: Priorities for the EU's new leadership, September 2014.

The multiple crises the European Union (EU) has experienced in recent years have fundamentally altered decision-making and, more broadly, governance in the EU. Pre-crisis systems and processes were not adequate to react to such critical and systemic challenges, but the speed of the crisis meant that new governance mechanisms have been superimposed on existing processes and structures rather than seeing a fundamental reform of decision-making. Consequently, not all changes have been fully successful. Given the institutional changes this year and the ongoing development of the EMU governance framework, now presents a good opportunity to reform EU decision-making.

Modern music and musicians /

"Philharmonic edition."

Modern music and musicians ... /

[pt. 1] Compositions for piano -- [pt. 2] Encyclopedic. v.2-3 The great composers: critical and biographical sketches.

Modern music and musicians.

Vol. [8]-[10] have binder's title: Modern music and musicians. Encyclopedic. I-III.