Resummation and Shower Studies

The transverse momentum spectra of the Z and Higgs bosons are studied, as probes of the consequences of multiple parton emissions in hadronic events. Emphasis is put on constraints, present in showers, that go beyond conventional leading log. It is shown that, if such constraints are relaxed, better agreement can be obtained with experimental data and with resummation descriptions.Comment: 6 pages, LaTeX, 3 eps figures, submitted to the proceedings of the Workshop on Physics at TeV Colliders, Les Houches, France, 26 May -- 6 June 200

Producción de pólipos clonales del organismo modelo Exaiptasia diaphana (Rapp, 1829)

Background. The sea anemone Exaiptasia diaphana (Order Actiniaria) is an ideal model organism to study diverse biological, physiological, and immune processes in corals (Order Scleractinia) due to its close phyletic relationship and shared traits. E. diaphana is widely distributed along the world’s tropical coastal areas. This species is easy to grow in aquariums under diverse experimental conditions since reproduces asexually and can be rendered aposymbiotic. However, there are a variety of methods to propagate them, making difficult comparisons of results. A standardized propagation protocol for E. diaphana can also contribute to improving the understanding of its biology. Goal. Determine the most rapid method of clonal production in controlled conditions. Results. In the micro-laceration treatment, 50% of the remnant tissue gave rise to a new clonal polyp, while all the amputated anemones resulted in two polyps with tentacles and a pedal disc. Amputated clonal polyps developed their tentacles from the third day, being this treatment the most rapid compared with the control group and the micro-laceration treatment. In both cases, the tentacles started to develop from the sixth day of the experiment. The control group naturally released five clonal polyps with tentacles in the ten-day experiment Conclusion. Transversal amputation was the most rapid method to obtain developed clonal polyps. We, therefore, propose transversal amputation as a standard method for the efficient artificial propagation of the clonal polyps of the model organism E. diaphana.Antecedentes. La anémona marina Exaiptasia diaphana (Orden Actiniaria) es un organismo modelo ideal para estudiar procesos biológicos, fisiológicos e inmunitarios en corales (Orden Scleractinia), debido a su estrecha relación filética y sus rasgos compartidos. E. diaphana tiene una distribución amplia en las zonas tropicales costeras. Esta especie es fácil de mantener en acuarios bajo diversas condiciones experimentales, ya que se reproduce asexualmente y puede transformarse en aposimbiótica. Sin embargo, los métodos de propagación son diversos, lo que dificulta la comparación directa de resultados. Un protocolo estandarizado de propagación de E. diaphana puede contribuir a mejorar el entendimiento de su biología. Objetivo. Determinar el método más rápido de producción de pólipos clonales en condiciones controladas. Resultados. En el tratamiento de micro laceración, el 50% del tejido remanente dio lugar a un nuevo pólipo clonal, mientras que cada anémona amputada formó dos pólipos con tentáculos y pie desarrollados. Los pólipos clonales amputados desarrollaron tentáculos a partir del tercer día, mientras que los pies del grupo control y el tejido remanente de la micro laceración desarrollaron tentáculos a partir del sexto día. El grupo control liberó naturalmente cinco pólipos con tentáculos bien desarrollados en los diez días del experimento. Conclusión. La amputación transversal fue el método más rápido para obtener pólipos clonales desarrollados, por lo que se propone como método estándar para la propagación artificial eficiente de pólipos clonales del organismo modelo E. diaphana

Satisfaction of private interest associations’ members: a study with sugarcane producers in Brazil

El objetivo en este estudio es identificar los factores predictivos de satisfacción presentada por productores de caña de azúcar con relación a las asociaciones de afiliación voluntaria a las que pertenecen. Se desarrolló un modelo compuesto por siete dimensiones organizadas en dos tipos: aspectos individuales (aspectos económicos, establecimiento de nuevas relaciones y honor) y aspectos colectivos (percepción de los servicios, representación, fiabilidad y relevancia de la asociación). Se aplicaron cuestionarios directamente a 550 productores, de los que resultaron 411 válidos. A partir de los datos recolectados, se realizaron análisis de correlación y regresión lineal múltiple. Los resultados mostraron que las siete variables del modelo se correlacionan positivamente con la satisfacción, sin embargo, sólo cinco de ellas compusieron el modelo final tras llevarse a cabo la regresión lineal múltiple: percepción de los servicios ofrecidos, representación, fiabilidad, aspecto económico y honor. Además, los resultados indicaron, a diferencia de lo esperado, que los aspectos colectivos afectan más la satisfacción de los productores que los aspectos individuales. Se presentan importantes orientaciones sobre los estudios en asociativismo y la gestión de asociaciones.This study aimed to identify satisfaction antecedents presented by sugar cane producers with the associations they belong to. It was developed a model composed of seven dimensions which were grouped into two types: individual aspects (economic, networking and honor) and collective aspects (perception of services, representation, trust and relevance of the association). It was performed one quantitative and descriptive study, conducted through questionnaires applied directly to producers. 550 questionnaires were completed and 411 of these were valid. For the data analysis, correlation and multiple linear regression between the variables were used. The results showed that all seven variables were positively correlated with satisfaction, however, only five of them comprised the final model after multiple linear regression: perception of services offered, representation, trust, economical aspect and honor. Surprisingly, the results also showed that collective aspects affected more the satisfaction than individual aspects.O objetivo do estudo foi identificar os elementos preditores da satisfação apresentada por produtores de cana-de-açúcar com as associações de adesão voluntária que eles fazem parte. Foi desenvolvido um modelo composto por sete dimensões aglomeradas em dois tipos: aspectos individuais (aspectos econômicos, estabelecimento de novos relacionamentos e honra) e aspectos coletivos (percepção de serviços, representação, confiança e relevância da associação). Questionários foram aplicados diretamente a 550 produtores e desses 411 foram válidos. A partir dos dados levantados, foram feitas análises de correlação e regresso linear múltipla entre as variáveis. Os resultados identificaram que todas as sete variáveis do modelo apresentam correlação positiva com a satisfação, entretanto apenas cinco delas compuseram o modelo final após a regressão linear múltipla: percepção de serviços oferecidos, representação, confiança, aspecto econômico e honra. Os resultados também mostraram, diferentemente do esperado, que os aspectos coletivos influenciam mais a satisfação dos produtores do que os aspectos individuais. Apresentam-se importantes orientações sobre a pesquisa em associativismo e a gestão de associações

Satisfaction of private interest associations’ members: a study with sugarcane producers in Brazil

El objetivo en este estudio es identificar los factores predictivos de satisfacción presentada por productores de caña de azúcar con relación a las asociaciones de afiliación voluntaria a las que pertenecen. Se desarrolló un modelo compuesto por siete dimensiones organizadas en dos tipos: aspectos individuales (aspectos económicos, establecimiento de nuevas relaciones y honor) y aspectos colectivos (percepción de los servicios, representación, fiabilidad y relevancia de la asociación). Se aplicaron cuestionarios directamente a 550 productores, de los que resultaron 411 válidos. A partir de los datos recolectados, se realizaron análisis de correlación y regresión lineal múltiple. Los resultados mostraron que las siete variables del modelo se correlacionan positivamente con la satisfacción, sin embargo, sólo cinco de ellas compusieron el modelo final tras llevarse a cabo la regresión lineal múltiple: percepción de los servicios ofrecidos, representación, fiabilidad, aspecto económico y honor. Además, los resultados indicaron, a diferencia de lo esperado, que los aspectos colectivos afectan más la satisfacción de los productores que los aspectos individuales. Se presentan importantes orientaciones sobre los estudios en asociativismo y la gestión de asociaciones.This study aimed to identify satisfaction antecedents presented by sugar cane producers with the associations they belong to. It was developed a model composed of seven dimensions which were grouped into two types: individual aspects (economic, networking and honor) and collective aspects (perception of services, representation, trust and relevance of the association). It was performed one quantitative and descriptive study, conducted through questionnaires applied directly to producers. 550 questionnaires were completed and 411 of these were valid. For the data analysis, correlation and multiple linear regression between the variables were used. The results showed that all seven variables were positively correlated with satisfaction, however, only five of them comprised the final model after multiple linear regression: perception of services offered, representation, trust, economical aspect and honor. Surprisingly, the results also showed that collective aspects affected more the satisfaction than individual aspects.O objetivo do estudo foi identificar os elementos preditores da satisfação apresentada por produtores de cana-de-açúcar com as associações de adesão voluntária que eles fazem parte. Foi desenvolvido um modelo composto por sete dimensões aglomeradas em dois tipos: aspectos individuais (aspectos econômicos, estabelecimento de novos relacionamentos e honra) e aspectos coletivos (percepção de serviços, representação, confiança e relevância da associação). Questionários foram aplicados diretamente a 550 produtores e desses 411 foram válidos. A partir dos dados levantados, foram feitas análises de correlação e regresso linear múltipla entre as variáveis. Os resultados identificaram que todas as sete variáveis do modelo apresentam correlação positiva com a satisfação, entretanto apenas cinco delas compuseram o modelo final após a regressão linear múltipla: percepção de serviços oferecidos, representação, confiança, aspecto econômico e honra. Os resultados também mostraram, diferentemente do esperado, que os aspectos coletivos influenciam mais a satisfação dos produtores do que os aspectos individuais. Apresentam-se importantes orientações sobre a pesquisa em associativismo e a gestão de associações

Resolution of Linear Algebra for the Discrete Logarithm Problem Using GPU and Multi-core Architectures

In cryptanalysis, solving the discrete logarithm problem (DLP) is key to assessing the security of many public-key cryptosystems. The index-calculus methods, that attack the DLP in multiplicative subgroups of finite fields, require solving large sparse systems of linear equations modulo large primes. This article deals with how we can run this computation on GPU- and multi-core-based clusters, featuring InfiniBand networking. More specifically, we present the sparse linear algebra algorithms that are proposed in the literature, in particular the block Wiedemann algorithm. We discuss the parallelization of the central matrix--vector product operation from both algorithmic and practical points of view, and illustrate how our approach has contributed to the recent record-sized DLP computation in GF($2^{809}$).Comment: Euro-Par 2014 Parallel Processing, Aug 2014, Porto, Portugal. \<http://europar2014.dcc.fc.up.pt/\&gt

Contrasting Antibacterial Capabilities of the Surface Mucus Layer From Three Symbiotic Cnidarians

Coral reefs are affected by the deterioration of the oceans due to global warming and other anthropogenic perturbations, increasing the frequency, and severity of bleaching and disease. To overcome some of these conditions, reef corals and other cnidarians rely on a mucus layer housing a diverse community of beneficial microorganisms and mechanisms of innate immune response. The antimicrobial defense has been associated with the bacterial community in these organisms, but the potential antimicrobial activity of the mucus layer itself has not been explored fully. We hypothesized that the bacteria-free mucus layer of different cnidarians would show differential and specific antimicrobial and immunological responses when challenged with two potentially pathogenic bacteria. We evaluated this capability through antimicrobial properties, immune response and biochemical composition of the mucus. Results clearly showed that the mucus of healthy cnidarians has the capability of inhibiting the growth of Serratia marcescens and Aurantimonas sp. in a species-specific way that includes differences in the potency of the response. The anemone Exaiptasia pallida was particularly potent against Aurantimonas sp. while the coral Pseudodiploria strigosa and the medusa Cassiopea xamachana had similar capabilities against both bacterial strains. In coral affected by black band disease, this antibacterial capability diminished in the mucus layer, but the associated bacteria remained potent. Results showed that hydroxyproline and phenoloxidase increased in the transition zone of diseased corals, although melanin was not detected in any of the animals tested. Bleaching of anemones and medusas also diminished the antibacterial capability of the surface mucus layer, but in anemones, the associated bacteria did not show a significant reduction in their ability to inhibit the growth of the bacterial strains. The mucus of bleached medusas showed an increased inhibitory activity against Aurantimonas sp. that may be associated with a specific bacterial strain we isolated. Mucus collected from bleached anemones and medusas did not show a significant immune response. In this work, we show that the surface mucus layer itself has antibacterial properties not associated with the bacteria this layer houses; such properties diminished due to disease or bleaching, while immunological responses increased in the mucus of diseased animals

A kilobit hidden SNFS discrete logarithm computation

We perform a special number field sieve discrete logarithm computation in a 1024-bit prime field. To our knowledge, this is the first kilobit-sized discrete logarithm computation ever reported for prime fields. This computation took a little over two months of calendar time on an academic cluster using the open-source CADO-NFS software. Our chosen prime $p$ looks random, and $p--1$ has a 160-bit prime factor, in line with recommended parameters for the Digital Signature Algorithm. However, our p has been trapdoored in such a way that the special number field sieve can be used to compute discrete logarithms in $\mathbb{F}\_p^*$ , yet detecting that p has this trapdoor seems out of reach. Twenty-five years ago, there was considerable controversy around the possibility of back-doored parameters for DSA. Our computations show that trapdoored primes are entirely feasible with current computing technology. We also describe special number field sieve discrete log computations carried out for multiple weak primes found in use in the wild. As can be expected from a trapdoor mechanism which we say is hard to detect, our research did not reveal any trapdoored prime in wide use. The only way for a user to defend against a hypothetical trapdoor of this kind is to require verifiably random primes

Two-Center Integrals for r_{ij}^{n} Polynomial Correlated Wave Functions

All integrals needed to evaluate the correlated wave functions with polynomial terms of inter-electronic distance are included. For this form of the wave function, the integrals needed can be expressed as a product of integrals involving at most four electrons