Side-slipping of a radiating particle

Radiation reaction is revisited, first in a new classical aproach, where the physical particle 4-momentum is redefined as the energy-momentum flux across the future light cone and is not parallel to the 4-velocity. Then in a semi-classical approach, it is shown that, when emitting a photon, the particle "side-slips" transversaly to its initial momentum, justifying the non-colinearity between momentum and mean velocity. Side-slipping is finally checked in a pure quantum mechanical treatment of synchrotron radiation.Comment: 8 pages, 6 figures. presented at the Int. Conf. QEDSP 2001, dedicated to the 90th anniversary of A.I.Akhiezer, Kharkov (Ukraine) Oct. 30 - Nov. 3, 2001 To appear in the proceeding

Genoveva Alcocer, la tejedora de coronas y la artífice de un discurso que teje con los hilos del recuerdo

Genoveva Alcocer es el personaje de ficción protagónico de La tejedora de Coronas -- El presente artículo está orientado a analizar el significado de su nombre como propuesta de configuración del personaje, intentando descifrar la estructura narrativa a partir de su oficio de tejedora -- Para ello, se analiza el significado del nombre de Genoveva desglosándolo en dos segmentos: la tejedora y corona -- Así, definiendo la acción de tejer, se establece la configuración del personaje femenino y se resalta el simbolismo de la palabra corona relacionada con la Ilustración, marco en el cual se inscribe la ficció

The 2007 Summer Workshop on Money, Banking and Payments: an overview

The 2007 Summer Workshop on Money, Banking, Payments and Finance met at the Federal Reserve Bank of Cleveland this summer, as we have over the past several years. The following document summarizes and ties together the contributions presented at the workshop this year.Monetary policy ; Monetary theory ; Money ; Banks and banking

Coping with citizen demands: a field study of suckling processes in dairy herds

In dairy farms calves and cows are usually separated shortly after birth but this practice raises the question of animal welfare. This social concern may lead to bring back dairy calves to their mother. Even though suckling is quite seldom in dairy production, some farmers are using such a practice for many years. The present study aims to better know farmer’s motivations, practical implementation and farmer’s perception of the impact of suckling on performance and animal behaviour. In January 2018 a semi-quantitative survey was performed on 44 farms where calves suckle at least 24 hours their mother or a nurse cow. The farming systems differed on the size (20 to 140 cows), the type (19 conventional, 25 organic farms), the suckling (28 by the mothers, 16 by nurses), and the breed. Results indicate that main farmers’ motivations are calves’ health (52%), better working conditions (41%) and saving time (34%), with little consideration on animal welfare (7%). Numerous practices were found in terms of allowance of daily cow-calf contact and suckling duration with a difference between male and female calves. According to farmers, these practices were efficient to improved calves’ health (70%), save time (75%) and improved working conditions (52%). Weaning was considered as a stressful situation, especially after long suckling periods. Cow mooing usually stopped 2.5 d after weaning. At least 34 farmers are fully satisfied with this practice. The main challenge appears to be the management of the wildness of future heifers, by investing time to manipulate calves before weaning. The results of this survey could help to propose solutions to farmers who want to cope with the societal demand of keeping calves with dams in dairy herds

Guillaume Bignon: Excusing Sinners and Blaming God: A Calvinist Assessment of Determinism, Moral Responsibility, and Divine Involvement in Evil. Eugene: Pickwick, 2018. [Book review]

Non peer reviewe

Morehead State Golf 1974

The 1974 official media guide of the Morehead State University golf team.https://scholarworks.moreheadstate.edu/msu_sports_programs/1364/thumbnail.jp

Emilio Candela & Jorge Lossio. Prensa, conspiraciones y elecciones: el Perú en el ocaso del régimen oligárquico

La publicación de este pequeño libro sobre un período poco conocido del siglo XX peruano es un paso adelante. En comparación con los años de Leguía, o de las últimas décadas del siglo, los años de 1930 a 1960 en el Perú son menos estudiados. Antonio Zapata, quien fue profesor de los dos autores, subraya de hecho en el primer prólogo lo importante de este libro para la renovación de la historia política. La estructura del libro consta de dos partes muy diferentes y poco articuladas entre ellas..

Aspects Tomodensitometriques des Infections Rachidiennes dans le Service d’Imagerie Medicale du CNHU-HKM a Cotonou (Benin)

Introduction : Les atteintes infectieuses du rachis (AIR) sont rares, mais en recrudescence en raison des affections immunodépressives et immunosuppressives. Elles représentent 4 à 7 % de toutes les ostéomyélites. Au Centre National Hospitalier Universitaire Hubert Koutoukou Maga (CNHU HKM) de Cotonou (Bénin), elles constituent 2,31% des hospitalisations. L’objectif de ce travail était de décrire leurs caractéristiques tomodensitométriques. Matériels et méthode : Étude transversale descriptive à collecte rétrospective menée dans le service d’imagerie médicale du CNHUHKM sur une période de six (06) ans allant du 1er Janvier 2012 au 31 Décembre 2017. Portant sur les comptes rendus de scanner où le diagnostic d’AIR avait été retenu. Les examens tomodensitométriques avaient été réalisés à l’aide d’un Scanner Siemens Somatom Emotion (16 barrettes modèle 2011). Résultats : Sur 2797 scanners du rachis, 140 AIR (3,5%) avaient été suspectées et 72 (2.6%) avaient été confirmées sur les images scanographiques. L’âge moyen était de 49,98 ans ± 15,5 ans avec une prédominance masculine (sex ratio= 1,2). Le segment de prédilection était lombaire (77,8%) avec des érosions en miroir (11,12 %) principalement au niveau de l’étage L3-L4 (12.5%). Une hypodensité́discale était retrouvée dans 16.7% des cas. L’atteinte somatique la plus fréquente était l’ostéocondensation (20,8%). Les tassements vertébraux étaient observés dans 9.72% et les listhésis dans 11.11% des cas. Les diagnostics de discite, de spondylite, et de spondylodiscite avaient été retenus respectivement dans 6,94%, 8,33% et 84,72 % des cas. Une extension aux parties molles était retrouvée dans 27,8 % des cas dont un abcès des parties molles dans 22,22% des cas. Conclusion : Au décours de cette étude, le diagnostic des AIR bien que tardif, a majoritairement été posé au scanner avant la survenue de complications. Les érosions en miroir des spondyles étaient fortement évocatrices en dehors de toute hypodensité́ discale.   Introduction: Infections of the spine (AIR) are rare but increase because of immunosuppressive and immunosuppressive disorders. They represent 4 to 7% of all osteomyelitis. At the Hubert Koutoukou Maga National University Hospital Center (CNHU HKM), they constitute 2.31% of hospitalizations. The aim of this work is to describe their CT characteristics at the CNHU-HKM in Cotonou. Material and method: Retrospective descriptive cross-sectional study conducted of the CNHU-HKM medical imaging department over a period of 06 years from January 1, 2012 to December 31, 2017. Included were all CT scan reports where the diagnosis was made AIR had been retained. Computed tomographic examinations were performed using a Siemens Somatom Emotion® Scanner (16 slices model 2011). Results: Of 2,797 spine scans, 140 IRAs were suspected and 72 (2.6%) were diagnosed on the scanographic images. The average age was 49.98 ± 15.5 years with a male predominance (sex ratio = 1.2). The preferred segment was lumbar (77.8%) with mirror erosions (11.12%) mainly at the L3-L4 stage (12.5%). A disc hypodensity was found in 16.7% of cases. The most common somatic involvement was osteocondensation (20.8%). Vertebral compression was observed in 9.72% and listhesis in 11.11% of cases. Diagnoses of discitis, spondylitis, and spondylodiscitis were retained in 6.94%, 8.33% and 84.72% of cases, respectively. Soft tissue extension was found in 27.8% of cases including soft tissue abscess in 22.22% of cases. Conclusion: During the course of this study, the diagnosis of RIA, although late, was mainly performed on CT before the occurrence of complications. The mirrored erosions of the spondyls were strongly evocative outside of any disc hypodensity