956 research outputs found
Neutral Particles and Super Schwinger Terms
Z_2-graded Schwinger terms for neutral particles in 1 and 3 space dimensions
are considered.Comment: 13 page
A procedure for standardization of color infrared film response
Various problems with color infrared film used for remote sensing applications which relate to the instability or variability of the relative sensitivities of the dye layers within the film and the resultant variations in color balance are indicated. A procedure developed and utilized to optimize film response and to achieve more consistent results is described. The procedure establishes a sensitometric aim point with which all new batches of film are compared. Through the use of color compensation filters and change in basic exposure, the new film is exposed to produce imagery with the response characteristics of the aim curves
Género y capacidades directivas en cooperativas de trabajo asociado. Estudio exploratorio en CTAS valencianas
In the last two decades, much research has been done regarding gender differences and leadership styles. This paper presents some of the organizational implications of cooperative firms (Coops) and how their characteristics affect the leadership style of managers. Also, from a gender perspective, we study the management style associated with gender differences in Coops in Valencia (Spain).The results suggest that the nature of the work done by women managers, and their vision of management, responds to a more contemporary leadership style, and fits better in the organizational context of coops, which are characterized by equal relations.Son numerosas las investigaciones que desde hace más de dos décadas han investigado posibles influencias de género en el comportamiento en la empresa y en los estilos de dirección. Sin embargo, en el análisis no se han contemplado los aspectos institucionales y organizativos, que juegan un papel relevante en el comportamiento y en el trabajo de los directivos.Atendiendo a lo anterior, este trabajo muestra las implicaciones organizativas que tiene la forma institucional Cooperativa de trabajo asociado (CTA) y cómo afectan al trabajo directivo. Asimismo, y desde una perspectiva de género, se investigan en CTAs valencianas las capacidades directivas vinculadas a diferencias de género.Los resultados obtenidos sugieren que la naturaleza del trabajo que realizan las directivas (mujeres) así como su visión del trabajo directivo, responde a un estilo directivo contemporáneo, y tienen un mayor “encaje” con el contexto organizativo de la CTA caracterizado por relaciones entre iguales
A four-season prospective study of muscle strain reoccurrences in a professional football club
The aim of this investigation was to characterise muscle strain reinjuries and examine their impact on playing resources in a professional football club. Muscle strains and reoccurrences were prospectively diagnosed over four seasons in first-team players (n = 46). Altogether, 188 muscle strains were diagnosed with 44 (23.4%) of these classed as reinjuries, leading to an incidence of 1.32 strain reoccurrences per 1,000 hours exposure (95% Confidence Interval [CI], 0.93–1.71). The incidence of recurrent strains was higher in match-play compared with training (4.51, 95% CI, 2.30–6.72 vs 0.94, 95% CI, 0.59–1.29). Altogether, 50.0% of players sustained at least 1 reoccurrence of a muscle strain, leading to approximately 3 days lost and 0.4 matches missed per player per season. The incidence of recurrent strains was highest in centre-forwards (2.15, 95% CI, 1.06–3.24), peaked in May (3.78, 95% CI, 0.47–7.09), and mostly affected the hamstrings (38.6% of all reoccurrences). Mean layoff for nonreoccurrences and recurrences was similar: ∼7.5 days. These results provide greater insight into the extent of the problem of recurrent muscle strains in professional football
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Developing a scalable training model in global mental health: pilot study of a video-assisted training Program for Generalist Clinicians in Rural Nepal.
BackgroundIn low- and middle-income countries, mental health training often includes sending few generalist clinicians to specialist-led programs for several weeks. Our objective is to develop and test a video-assisted training model addressing the shortcomings of traditional programs that affect scalability: failing to train all clinicians, disrupting clinical services, and depending on specialists.MethodsWe implemented the program -video lectures and on-site skills training- for all clinicians at a rural Nepali hospital. We used Wilcoxon signed-rank tests to evaluate pre- and post-test change in knowledge (diagnostic criteria, differential diagnosis, and appropriate treatment). We used a series of 'Yes' or 'No' questions to assess attitudes about mental illness, and utilized exact McNemar's test to analyze the proportions of participants who held a specific belief before and after the training. We assessed acceptability and feasibility through key informant interviews and structured feedback.ResultsFor each topic except depression, there was a statistically significant increase (Δ) in median scores on knowledge questionnaires: Acute Stress Reaction (Δ = 20, p = 0.03), Depression (Δ = 11, p = 0.12), Grief (Δ = 40, p < 0.01), Psychosis (Δ = 22, p = 0.01), and post-traumatic stress disorder (Δ = 20, p = 0.01). The training received high ratings; key informants shared examples and views about the training's positive impact and complementary nature of the program's components.ConclusionVideo lectures and on-site skills training can address the limitations of a conventional training model while being acceptable, feasible, and impactful toward improving knowledge and attitudes of the participants
Longitudinal membrane function in functionally anuric patients treated with APD: Data from EAPOS on the effects of glucose and icodextrin prescription
Longitudinal membrane function in functionally anuric patients
treated with APD: Data from EAPOS on the effects of glucose
and icodextrin prescription.
Background: Peritoneal dialysis is associated with changes
in membrane function that can lead eventually to ultrafiltration
(UF) failure. Factors driving these changes are thought to
include hypertonic glucose exposure, but previously reported
associations are confounded by the presence of residual renal
function.
Methods: Longitudinal membrane function (solute transport
and UF capacity) were measured annually in a prospective
cohort of 177 functionally anuric patients as part of the
European Automated Peritoneal Dialysis Outcomes Study
(EAPOS). Subgroup analysis was performed according to glucose
exposure and icodextrin use at baseline.
Results: The whole cohort experienced an increase in solute
transport and reduction in UF capacity at 12 and 24 months
that could not be explained by informative censoring. These
changes were accelerated and more severe in patients using
either 2.27% or 3.86% glucose, or those not using icodextrin
at baseline. These differences could not be explained by age,
comorbidity score, previous time spent on renal replacement,
differential dropout from the study, peritonitis rates, or, by definition,
residual renal function. Patients using icodextrin at baseline
had worse membrane function and were more likely to be
diabetic. There was an association between membrane function
changes and achieved 24-hour ultrafiltration over the 2-year
study period.
Conclusion: Anuric automated peritoneal dialysis (APD) patients
experience significant detrimental changes in membrane
function over a relatively short time period. Glucose appears
to enhance these changes independent of residual renal function. Icodextrin use in these circumstances is associated with
less deterioration in membrane functio
Large N limit of SO(N) gauge theory of fermions and bosons
In this paper we study the large N_c limit of SO(N_c) gauge theory coupled to
a Majorana field and a real scalar field in 1+1 dimensions extending ideas of
Rajeev. We show that the phase space of the resulting classical theory of
bilinears, which are the mesonic operators of this theory, is OSp_1(H|H
)/U(H_+|H_+), where H|H refers to the underlying complex graded space of
combined one-particle states of fermions and bosons and H_+|H_+ corresponds to
the positive frequency subspace. In the begining to simplify our presentation
we discuss in detail the case with Majorana fermions only (the purely bosonic
case is treated in our earlier work). In the Majorana fermion case the phase
space is given by O_1(H)/U(H_+), where H refers to the complex one-particle
states and H_+ to its positive frequency subspace. The meson spectrum in the
linear approximation again obeys a variant of the 't Hooft equation. The linear
approximation to the boson/fermion coupled case brings an additonal bound state
equation for mesons, which consists of one fermion and one boson, again of the
same form as the well-known 't Hooft equation.Comment: 27 pages, no figure
Chiral de Rham complex on Riemannian manifolds and special holonomy
Interpreting the chiral de Rham complex (CDR) as a formal Hamiltonian
quantization of the supersymmetric non-linear sigma model, we suggest a setup
for the study of CDR on manifolds with special holonomy. We show how to
systematically construct global sections of CDR from differential forms, and
investigate the algebra of the sections corresponding to the covariantly
constant forms associated with the special holonomy. As a concrete example, we
construct two commuting copies of the Odake algebra (an extension of the N=2
superconformal algebra) on the space of global sections of CDR of a Calabi-Yau
threefold and conjecture similar results for G_2 manifolds. We also discuss
quasi-classical limits of these algebras.Comment: 49 pages, title changed, major rewrite with no changes in the main
theorems, published versio
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