The bottom-quark mass from non-relativistic sum rules at NNNLO

We determine the mass of the bottom quark from high moments of the bbproduction cross section in e+e−annihilation, which are dominated by the threshold region. On the theory side next-to-next-to-next-to-leading order (NNNLO) calculations both for the resonances and the continuum cross section are used for the first time. We find mPSb(2GeV) =4.532+0.013−0.039GeVfor the potential-subtracted mass and mMSb(mMSb) =4.193+0.022−0.035GeVfor the MSbottom-quark mass.

Coordinating Platform-Based Multi-Sourcing: Introducing the Theory of Convention

Spurred by the consumer market, companies increasingly deploy smartphones or tablet computers in their operations. However, unlike private users, companies typically struggle to cover their needs with existing applications, and therefore expand mobile software platforms through customized applications from multiple software vendors. Companies thereby combine the concepts of multi-sourcing and software platform ecosystems in a novel platform-based multi-sourcing setting. This implies, however, the clash of two different approaches towards the coordination of the underlying one-to-many inter-organizational relationships. So far, however, little is known about impacts of merging coordination approaches. Relying on convention theory, we addresses this gap by analyzing a platform-based multi-sourcing project between a client and six software vendors, that develop twenty-three custom-made applications on a common platform (Android). In doing so, we aim to understand how unequal coordination approaches merge, and whether and for what reason particular coordination mechanisms, design decisions, or practices disappear, while new ones emerge.

From quantum to classical dynamics: The relativistic O ( N ) model in the framework of the real-time functional renormalization group

We investigate the transition from unitary to dissipative dynamics in the relativistic O(N) vector model with the λ(φ2)2 interaction using the nonperturbative functional renormalization group in the real-time formalism. In thermal equilibrium, the theory is characterized by two scales, the interaction range for coherent scattering of particles and the mean free path determined by the rate of incoherent collisions with excitations in the thermal medium. Their competition determines the renormalization group flow and the effective dynamics of the model. Here we quantify the dynamic properties of the model in terms of the scale-dependent dynamic critical exponent z in the limit of large temperatures and in 2≤d≤4 spatial dimensions. We contrast our results to the behavior expected at vanishing temperature and address the question of the appropriate dynamic universality class for the given microscopic theory.

Global models of planet formation and evolution

Despite the strong increase in observational data on extrasolar planets, the processes that led to the formation of these planets are still not well understood. However, thanks to the high number of extrasolar planets that have been discovered, it is now possible to look at the planets as a population that puts statistical constraints on theoretical formation models. A method that uses these constraints is planetary population synthesis where synthetic planetary populations are generated and compared to the actual population. The key element of the population synthesis method is a global model of planet formation and evolution. These models directly predict observable planetary properties based on properties of the natal protoplanetary disc, linking two important classes of astrophysical objects. To do so, global models build on the simplified results of many specialized models that address one specific physical mechanism. We thoroughly review the physics of the sub-models included in global formation models. The sub-models can be classified as models describing the protoplanetary disc (of gas and solids), those that describe one (proto)planet (its solid core, gaseous envelope and atmosphere), and finally those that describe the interactions (orbital migration and N-body interaction). We compare the approaches taken in different global models, discuss the links between specialized and global models, and identify physical processes that require improved descriptions in future work. We then shortly address important results of planetary population synthesis like the planetary mass function or the mass-radius relationship. With these statistical results, the global effects of physical mechanisms occurring during planet formation and evolution become apparent, and specialized models describing them can be put to the observational test. Owing to their nature as meta models, global models depend on the results of specialized models, and therefore on the development of the field of planet formation theory as a whole. Because there are important uncertainties in this theory, it is likely that the global models will in future undergo significant modifications. Despite these limitations, global models can already now yield many testable predictions. With future global models addressing the geophysical characteristics of the synthetic planets, it should eventually become possible to make predictions about the habitability of planets based on their formation and evolution.

A Simple Theory of Increasing Penalties for Repeat Offenders

A feature of many penal codes is that punishments are more severe for repeat offenders, yet economic models have had a hard time providing a theoretical justification for this practice. This paper offers an explanation based on the wage penalty suffered by individuals convicted of crime. While this penalty probably deters some first-timers from committing crimes, it actually hampers deterrence of repeat offenders because of their diminished employments opportunities. We show that in this setting, an escalating penalty scheme is optimal and time consistent.

Caenorhabditis elegans germinal center kinase (Gck-1) is a p-body component that inhibits precocious ectopic MAP kinase dependent meiotic maturation

The Caenorhabditis elegans germline is an excellent model system for studying meiosis, as the gonad contains germ cells in all stages of meiosis I prophase in a linear temporal and spatial pattern. To form healthy gametes, many events must be coordinated. Failure of any step in the process can reduce fertility. Here, we describe a C. elegans Germinal Center Kinase, GCK-1, that is essential for the accurate progression of germ cells through meiosis I prophase. In the absence of GCK-1, germ cells undergo precocious maturation due to the activation of a specific MAP kinase isoform. Furthermore, GCK-1 localizes to P-bodies, RNP particles that have been implicated in RNA degradation and translational control. Like two other components of C. elegans germline P-bodies, GCK-1 functions to limit physiological germ cell apoptosis. This is the first study to identify a role for a GCK-III kinase in metazoan germ cell development and to link P-body function with MAP kinase activation and germ cell maturation. ^

A simplified protocol for the treatment of acute radiation overexposures from sources external to the body

When compared to other types of occupational injuries, radiation overexposure events are somewhat rare, so health care providers may not be familiar with the actual clinical care to be provided when such an event occurs. Radiation overexposure treatment decisions are predicated on the amount of radiation dose received, which is a value many health care providers may not have the knowledge or expertise to either calculate or even estimate. Even the different units of measure for radiation exposure and dose received can be a source of confusion. The prompt treatment of radiation overexposure victims could be enhanced and facilitated through the creation of a single, simple protocol that consists of the various means of dose measurement and estimation, correlated to the corresponding appropriate clinical care measures. This culminating experience will assemble essential information currently maintained in disparate references to create a single, simplified protocol to facilitate the treatment of victims of acute external radiation overexposure. ^

Body image rating scales to assess obesity

Obesity prevalence in the U.S. has increased during the last three decades with major impact on public health. Screening for obesity in a population with unknown weight status can be time- and resource-consuming, but the information is valuable for prioritizing and allocating scarce resources. The challenge remains to properly assess obesity with the available methods. Body Image Rating Scales (BIRS) have initially been developed to assess body image disturbances, but also seem useful as an alternative method in assessing obesity prevalence. Several different BIRS exists. In this project I reviewed the literature that exists regarding the use of BIRS, and its advantages and limitations for the assessment of obesity status with regards to BMI. The result yielded nine publications that examined eight different scales and their correlation with BMI, ranging from r=.59 for self-reported BMI to r=.94 for measured BMI. One concern is the lack of standardization of this method to assess obesity, given the range of different scales. While many methods for obesity assessment are available, the simplicity, ease of use and cost-effectiveness of BIRS make it very appealing. BIRS remain a potentially attractive option to assess the weight status of a large population with minimal requirements in assets and time, especially in situations where measuring instruments are not available, or when height or weight could not be recalled.^

Lifetime changes in body mass index and risk of breast cancer in minority women

Introduction: Obesity is an epidemic in the United States, especially among Hispanics and African-Americans. Studies of obesity and breast cancer risk and subtype have been conducted primarily in non-Hispanic whites. Obesity is inversely associated with premenopausal breast cancer, but both obesity and weight gain increase the risk of postmenopausal disease. Obesity has been associated with breast cancer subtype in many studies. Methods: To assess the association between changes in body mass index (BMI) over the lifetime, weight gain, and breast cancer in Mexican-American women, we conducted a case-control study using 149 cases and 330 age-matched controls. In a second study, we identified 212 African-American and 167 Mexican-American women with breast cancer in the ongoing ELLA Bi-National Breast Cancer Study, abstracted medical charts to classify tumors as ER+/PR+, HER2+, or ER-/PR-/HER2-, and assessed the association between lifetime changes in body mass index, weight gain, and breast cancer subtype. In both studies, growth mixture modeling was use to identify trajectories of change in BMI over the lifetime, and these trajectories were used as exposures in a logistic regression model to calculate odds ratios (OR). Results: There was no association between trajectories of change in BMI and breast cancer risk in Mexican-American women. In addition, BMI at ages 15 and 30 and at diagnosis was not associated with breast cancer. However, adult weight gain was inversely associated with breast cancer risk (per 5kg, OR=0.92, 95% CI: 0.85-0.99). The case-only analysis found no association between obesity at ages 15 and 30 and at diagnosis and breast cancer subtype. Further, there was no association between adult weight gain (defined as weight change from age 15 to time of diagnosis) and breast cancer subtype. Conclusions: Obesity was not associated with breast cancer risk in Mexican-American women, while adult weight gain reduced the risk independently of menopausal status. These results are contradictory of those in non-Hispanic white women and suggest that the etiology of breast cancer may differ by race/ethnicity. Further, obesity was not associated with breast cancer subtype in African-American and Mexican-American women, contrary to results in non-Hispanic white women. ^

Bajtín, Borges y la resurrección de la rosa

Pensar la propuesta bajtiniana, formulada en las primeras décadas del siglo XX, acerca de las relaciones dialógicas, las entabladas entre el yo y el otro, entre la conciencia propia y la de los demás, entre la palabra propia y la ajena, entre la cultura nacional y las extranjeras, equivale a sumergirnos en uno de los temas o categorías actuales que han despertado las más variadas elaboraciones y discusiones teóricas, desde el espacio de la crítica. Una de las contribuciones más importantes del pensamiento contemporáneo de Mijail Bajtín está relacionada con la teoría del sujeto, cuando, en sus reflexiones acerca del hombre, expresa que lo que define precisamente al ser humano en cuanto tal, es la relación que establece con el otro en el acto creador. Ese otro que, precisamente, es alguien que no soy yo. Así, la alteridad se encuentra en el centro de su pensamiento dialógico. Su filosofía del acto ético parte de las relaciones que el yo entabla con el otro, argumentando que este otro es simplemente alguien que no soy yo, otro inmediato y cotidiano. El otro se convierte así en la primera realidad dada con la que nos encontramos en el mundo, ese mundo cuyo centro es el yo y en el que todos los demás se transforman en otros para mí. Al respecto, propone todo un sistema de relaciones, yo-para-mí, yo-para-otro, otro-para-mí, que se ponen en juego en la interacción cotidiana del sujeto con los otros hombres. Ese juego dialéctico entre “yo soy" y “yo también soy", entre otros, nos lleva a una de las reflexiones significativas del filósofo ruso: es el otro quien me proporciona la primera definición de mí mismo, de mi cuerpo, de mi valor, dada en este caso por la persona que nos recibe por primera vez en el mundo –la madre y su deseo- y desde la posición del otro que posee una visión sobre mi persona y el mundo, al percibir todo aquello que yo no puedo ver desde mi posición única. En suma, partiendo de la premisa expresada por Bajtín acerca de la estructura del diálogo, “siempre está presente la intersección, consonancia o interrupción de las réplicas del diálogo interno de los héroes", este estudio intenta articular, desde un espacio de análisis teórico, cómo el escritor argentino Jorge Luis Borges construye discursivamente al otro/otros en las variaciones del tema en muchas y diversas voces. Los cuentos Veinticinco Agosto 1983, Borges y yo, y La rosa de Paracelso, son los seleccionados para reflexionar y articular el pensamiento dialógico de Mijail Bajtín.

El deporte y la actividad física como mediadores de modelos corporales : Género y sexualidad en el aprendizaje de las masculinidades

Este artículo parte del análisis de algunas contribuciones teóricas sobre la conceptualización del cuerpo en las sociedades contemporáneas, que nos permitirá dialogar con las experiencias reflexivas de un grupo de chicos sobre el aprendizaje de la(s) masculinidad(es)i en sus vidas. El énfasis fenomenológico y político del cuerpo en los estudios feministas -con la noción de corporización- ha sido fundamental para problematizar las variables encarnadas de género, raza, edad, clase social, (dis)capacidad, etc. que no sólo operan en una relación de poder sobre nuestros cuerpos, sino también como locus de agencia y resistencia. La teoría queer con la deconstrucción de la sexualidad normativa -gracias a la noción de performatividad- será clave para entender el papel fundamental que la sexualidad desempeña en la construcción de la(s) subjetividad(es). Los relatos de los chicos nos permitirán explorar el papel que la actividad física y el deporte tiene en sus vidas como mediadores en la construcción de subjetividades "masculinas", muchas veces como un espacio opresor de identidad de género y opción sexual, y abrir la reflexión a las visiones hegemónicas de cuerpo que median tanto la educación física en las escuelas, como en el deporte de competición y/o de elite, y sus representaciones en los mass media.

El deporte y la actividad física como mediadores de modelos corporales : Género y sexualidad en el aprendizaje de las masculinidades

Este artículo parte del análisis de algunas contribuciones teóricas sobre la conceptualización del cuerpo en las sociedades contemporáneas, que nos permitirá dialogar con las experiencias reflexivas de un grupo de chicos sobre el aprendizaje de la(s) masculinidad(es)i en sus vidas. El énfasis fenomenológico y político del cuerpo en los estudios feministas -con la noción de corporización- ha sido fundamental para problematizar las variables encarnadas de género, raza, edad, clase social, (dis)capacidad, etc. que no sólo operan en una relación de poder sobre nuestros cuerpos, sino también como locus de agencia y resistencia. La teoría queer con la deconstrucción de la sexualidad normativa -gracias a la noción de performatividad- será clave para entender el papel fundamental que la sexualidad desempeña en la construcción de la(s) subjetividad(es). Los relatos de los chicos nos permitirán explorar el papel que la actividad física y el deporte tiene en sus vidas como mediadores en la construcción de subjetividades "masculinas", muchas veces como un espacio opresor de identidad de género y opción sexual, y abrir la reflexión a las visiones hegemónicas de cuerpo que median tanto la educación física en las escuelas, como en el deporte de competición y/o de elite, y sus representaciones en los mass media.

El deporte y la actividad física como mediadores de modelos corporales : Género y sexualidad en el aprendizaje de las masculinidades

Este artículo parte del análisis de algunas contribuciones teóricas sobre la conceptualización del cuerpo en las sociedades contemporáneas, que nos permitirá dialogar con las experiencias reflexivas de un grupo de chicos sobre el aprendizaje de la(s) masculinidad(es)i en sus vidas. El énfasis fenomenológico y político del cuerpo en los estudios feministas -con la noción de corporización- ha sido fundamental para problematizar las variables encarnadas de género, raza, edad, clase social, (dis)capacidad, etc. que no sólo operan en una relación de poder sobre nuestros cuerpos, sino también como locus de agencia y resistencia. La teoría queer con la deconstrucción de la sexualidad normativa -gracias a la noción de performatividad- será clave para entender el papel fundamental que la sexualidad desempeña en la construcción de la(s) subjetividad(es). Los relatos de los chicos nos permitirán explorar el papel que la actividad física y el deporte tiene en sus vidas como mediadores en la construcción de subjetividades "masculinas", muchas veces como un espacio opresor de identidad de género y opción sexual, y abrir la reflexión a las visiones hegemónicas de cuerpo que median tanto la educación física en las escuelas, como en el deporte de competición y/o de elite, y sus representaciones en los mass media.

Size matters: plasticity in metabolic scaling shows body-size may modulate responses to climate change

Variability in metabolic scaling in animals, the relationship between metabolic rate ( R) and body mass ( M), has been a source of debate and controversy for decades. R is proportional to Mb, the precise value of b much debated, but historically considered equal in all organisms. Recent metabolic theory, however, predicts b to vary among species with ecology and metabolic level, and may also vary within species under different abiotic conditions. Under climate change, most species will experience increased temperatures, and marine organisms will experience the additional stressor of decreased seawater pH ('ocean acidification'). Responses to these environmental changes are modulated by myriad species-specific factors. Body-size is a fundamental biological parameter, but its modulating role is relatively unexplored. Here, we show that changes to metabolic scaling reveal asymmetric responses to stressors across body-size ranges; b is systematically decreased under increasing temperature in three grazing molluscs, indicating smaller individuals were more responsive to warming. Larger individuals were, however, more responsive to reduced seawater pH in low temperatures. These alterations to the allometry of metabolism highlight abiotic control of metabolic scaling, and indicate that responses to climate warming and ocean acidification may be modulated by body-size.

A Mathematical Representation of "Excitement" in Games: A Contribution to the Theory of Game Systems

Researchers have long believed the concept of "excitement" in games to be subjective and difficult to measure. This paper presents the development of a mathematically computable index that measures the concept from the viewpoint of an audience and from that of a player. One of the key aspects of the index is the differential of the probability of "winning" before and after one specific "play" in a given game. The index makes a large contribution to the study of games and enables researchers to compare and analyze the “excitement” of various games. It may be applied in many fields, especially the area of welfare economics, and applications may range from those related to allocative efficiency to axioms of justice and equity.