Relativistic graphene ratchet on semidisk Galton board

Using extensive Monte Carlo simulations we study numerically and analytically a photogalvanic effect, or ratchet, of directed electron transport induced by a microwave radiation on a semidisk Galton board of antidots in graphene. A comparison between usual two-dimensional electron gas (2DEG) and electrons in graphene shows that ratchet currents are comparable at very low temperatures. However, a large mean free path in graphene should allow to have a strong ratchet transport at room temperatures. Also in graphene the ratchet transport emerges even for unpolarized radiation. These properties open promising possibilities for room temperature graphene based sensitive photogalvanic detectors of microwave and terahertz radiation.Comment: 4 pages, 4 figures. Research done at Quantware http://www.quantware.ups-tlse.fr/. More detailed analysis is give

Quantum Metrology Triangle Experiments: A Status Review

Quantum Metrology Triangle experiments combine three quantum electrical effects (the Josephson effect, the quantum Hall effect and the single-electron transport effect) used in metrology. These experiments allow important fundamental consistency tests on the validity of commonly assumed relations between fundamental constants of nature and the quantum electrical effects. This paper reviews the history, results and the present status and perspectives of Quantum Metrology Triangle experiments. It also reflects on the possible implications of results for the knowledge on fundamental constants and the quantum electrical effects.Comment: 36 pages, 8 figure

Development of a Toolbox through exploration of the Internet for managerial practices that promote mental health at work.

6th ICOH-WOPS Congress (WOPS 2017), MEXICO, MEXIQUE, 29-/08/2017 - 01/09/2017This document, which we will call "toolbox", provides an overview of the different approaches to counteract Psychosocial Risks (PSR). From the study of various Internet sites, our work has made it possible to establish this toolbox grouping managerial practices favorable to mental health in primary prevention. This summary work lists about 50 Internet links from 24 different sites. We thus analyzed these sites by interesting us particularly for each one with the part RPS and managerial practices favorable to the mental health.Ce document que nous appellerons « boîte à outils » permet de faire un état des connaissances sur les différentes approches pour contrer les Risques Psychosociaux (RPS). A partir de l'étude de différents sites Internet, notre travail a permis d'établir cette boîte à outils regroupant des pratiques managériales favorables à la santé mentale en prévention primaire. Ce travail de synthèse répertorie une 50aine de liens Internet issus de 24 sites différents. Nous avons ainsi analysé ces sites en nous intéressant particulièrement pour chacun à la partie RPS et pratiques managériales favorables à la santé mentale.Les liens profonds et les documents obtenus ont été ordonnés pour donner des références et des méthodes d'action regroupées en deux parties:- une partie générale : type de prévention et organisation d'une campagne- une deuxième partie plus spécifique construite autour des 12 indicateurs de la grille d'évaluation des RPS créée par l'Institut national de santé publique du Québec (INSPQ). Au cours des dernières années, une équipe de recherche de l'INSPQ a développé une grille d'identification de risques psychosociaux, qui permet de repérer ces risques et de proposer des orientations à privilégier dans le milieu de travail. Cette grille offre aux différents acteurs du milieu de travail des repères pour la compréhension, l'identification et la réduction de risques ayant un impact sur la sante psychologique et physique des travailleurs. Son contenu porte sur des caractéristiques du milieu de travail (partie 1) et certains aspects liés aux pratiques de gestion (partie 2). Ce repérage s'appuie sur les modélisations théoriques reconnues "demande -latitude-soutien au travail" de KARASEK et Theorell, "déséquilibre : effort/récompense » de SIEGRIST, justice organisationnelle créé par John Stacey Adams et prévisibilité de Kristensen. La grille d'évaluation de l'INSPQ étant conçue pour favoriser le dialogue social en entreprise, préalable à toute intervention préventive, ce document doit pouvoir constituer une source rapide d'informations pour les managers, que ce soit dans l'élaboration d'un plan d'action de prévention primaire ou dans la gestion de risques psychosociaux particuliers identifiés. Il peut constituer également un outil intéressant d'aide pour la rédaction du document unique d'évaluation des risques des employeurs, puisqu'une évaluation et des propositions concernant les risques psychosociaux doivent être réalisées dans ce cadre. Il peut aider les médecins du travail à mieux comprendre l'impact de l'organisation du travail et prendre en considération les RPS sur la santé des salariés dont ils ont la charge, à mieux les repérer dans une entreprise, et mieux informer les salariés, le CHSCT et les employeurs

Cistoadenoma de apêndice: relato de caso e revisão da literatura sobre tumores mucinosos do apêndice vermiforme Cyst adenoma of appendix: case report and literature review about mucinous vermiform appendix neoplasms

INTRODUÇÃO: Mucocele do apêndice (MA) é uma lesão rara, caracterizada pelo acúmulo de secreção mucoíde em sua luz. Diagnóstico precoce é fundamental para evitar o extravasamento de secreção mucoíde na cavidade peritoneal, causando pseudomixoma peritoneal. RELATO DE CASO: Paciente sexo masculino, 62 anos com história de dor abdominal em fossa ilíaca direita há cerca de 6 meses. Realizou uma ultra-sonografia do abdome que evidenciou no flanco direito pequena estrutura cística compatível com MA. Colonoscopia, exames laboratoriais e dosagem do CEA encontravam-se sem alterações. O paciente foi submetido à laparotomia exploradora com ressecção do apêndice e do seu meso em monobloco. O exame histológico mostrou tratar-se de cistoadenoma do apêndice vermiforme. O paciente evoluiu sem intercorrências. DISCUSSÃO: A MA é um achado raro. As principais causas patológicas incluem cisto de retenção, mucocele secundária a epitélio hiperplásico, cistoadenomas e cistoadenocarcinomas. A doença é geralmente assintomática e o diagnóstico pré-operatório é raro. O tratamento para mucocele do apêndice é cirúrgico e a preocupação principal do cirurgião é evitar o extravasamento do conteúdo da mucocele na cavidade abdominal. CONCLUSÃO: A MA é uma entidade incomum e com alto potencial de complicação, usualmente curável com tratamento cirúrgico adequado.<br>INTRODUCTION: Appendiceal mucocele (AM) is a rare lesion that is characterized by an appendiceal lumen distended with mucus. Early diagnosis and prompt surgical intervention are mandatory to prevent spillage of the mucinous content into the peritoneal cavity, causing pseudomyxoma peritonei. CASE REPORT: A 62-year-old male was presented with a 6-months history of recurrent right lower quadrant abdominal pain. Ultrasonography showed a lesion in the right lumbar region compatible with AM. Colonoscopy, routine laboratory tests and CEA were normal. The patient underwent an appendectomy and complete excision of the cystic lesion. Pathologic examination revealed a mucinous cyst adenoma of appendix. The patient was symptom free after treatment. DISCUSSION: AM is a rare condtion. Mucoceles are histologically subdivided into retention mucocele, mucocele secondary a hiperpalsic epithelium, mucinous cystadenoma and mucinous cystadenocarcinoma. This disease is often asymptomatic and pre-operative diagnosis is rare. The treatment is essentially surgical and the surgeon need to avoid spillage of the mucinous content into the peritoneal cavity. CONCLUSION: AM is an uncomum entity and with high pontential of complication, usually curable with adequate surgical aproach