Non SUSY Searches at the Tevatron

Recent searches for non-SUSY exotics in $p\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV at the Tevatron Run II are reported. The emphasis is put on the results of model-driven analyses which were updated to the full Run IIA datasets corresponding to integrated luminosities of about 1 $fb^{-1}$.Comment: 4 pages, 6 figures, Rencontres de Moriond 2007 "QCD and High Energy Hadronic Interactions

A New Method for Indirect Mass Measurements using the Integral Charge Asymmetry at the LHC

International audienceWe propose a novel method for an indirect measurement of the mass of final states produced through charged current processes at the LHC. This method is based upon the process integral charge asymmetry. First, the theoretical prediction of the integral charge asymmetry and its related uncertainties are studied through parton level cross sections calculations. Then, the experimental extraction of the integral charge asymmetry of a given signal, in the presence of some background, is performed using particle level simulations. Process dependent templates enable to convert the measured integral charge asymmetry into an estimated mass of the charged final state. Finally, a combination of the experimental and the theoretical uncertainties determines the full uncertainty of the indirect mass measurement. This new method applies to all charged current processes at the LHC. In this study, we demonstrate its effectiveness at extracting the mass of the W boson, as a first step, and the sum of the masses of a chargino and a neutralino in case these supersymmetric particles are produced by pair, as a second step. Note that contrarily to most of the usual mass reconstruction techniques that are based upon the kinematics of the events final state, this method depends on the events initial state and mainly reflects the charge asymmetry of the colliding protons

A new method for indirect mass measurements using the integral charge asymmetry at the LHC

International audienceProcesses producing a charged final state at the LHC most often have a positive or null integral charge asymmetry. We propose a novel method for an indirect measurement of the mass of these final states based upon the process integral charge asymmetry. We present this method in three stages. Firstly, the theoretical prediction of the integral charge asymmetry and its related uncertainties are studied through parton level cross sections calculations. Secondly, the experimental extraction of the integral charge asymmetry of a given signal, in the presence of some background, is performed using particle level simulations. Process dependent templates enable to convert the measured integral charge asymmetry into an estimated mass of the charged final state. Thirdly, a combination of the experimental and the theoretical uncertainties determines the full uncertainty of the indirect mass measurement. This new method applies to all charged current processes at the LHC. In this article, we demonstrate its effectiveness at extracting the mass of the W boson, as a first step, and the sum of the masses of a chargino and a neutralino in case these supersymmetric particles are produced by pair, as a second step

Contos de Costa Andrade como retrato documental do reordenamento rural no planalto central

O estudo de documentos que fornecem dados e descrevem factos reportando o processo de reordenamento rural na década de 60 em Angola permite estabelecer conexões suscetíveis de caucionar a dimensão histórica dos contos de Estórias de contratados, de Costa Andrade. Em finais de 1967, o Governo-Geral da Província de Angola instruiu a Junta de Povoamento para superintender operações de reordenamento rural das populações, transferindo-as para zonas agrícolas escolhidas e assentando-as em aldeias vigiadas (campos de reagrupamento). O Planalto Central, concretamente a localidade de Bailundo (no distrito do Huambo), oferecia condições propícias para uma experiência inicial por algumas razões: em função do contexto político, devido à sua posição geográfica, por se tratar de uma região essencialmente agrícola e por ser a mais povoada. Estórias de contratados textualiza o processo de emigração das populações: ou forçadas pela administração colonial, ou por vontade própria, dada a procura de terras para cultivar. A partir dos dados que os documentos fornecem, a nossa perspetiva de estudo consiste em descrever a significação do texto a fim de compreender a sua historicidade

Investigation into fly ash production during co-firing of biomass with pulverized coal

This dissertation considers the behaviour of particulate fly ash produced during cocombustion experiments of biomass materials with pulverized coal in a 1 MWth pilotscale combustion test facility (PSCTF). Particular attention is generally given to fly ash particles of diameters less than 10 and 2.5 microns (namely PM10 and PM2.5). These small particles have the potential for affecting human health and forcing climate change because of their ability to scatter and absorb light and also to act as cloud condensation nuclei. South African coal has high ash content that consequently affects the ash burden and the efficiency of ash removal system. Previous research work reports increase of the concentration of fine particles during the co-firing of biomass with coal, thus limiting the amount of biomass co-fired. Coal and two types of biomass, grass and sawdust, were used in this study. The coal chosen was representative on the basis of the annual average calorific value of coals burned at ESKOM’S coal-fired power stations. For each biomass, the ratios of biomass to coal used on an energy basis were 10%:90%, 15%:85% and 20%:80%, resulting in a total of seven different tests including coal alone. Seven tests with similar fuels were also carried out using a drop tube furnace (DTF) to determine their reaction kinetics for the combustion simulation. The experimental results revealed that the grass and sawdust blends showed decreases of PM10, and PM2.5 particles percentages compared to the coal baseline. The grass because of its high content of alumina-silicate showed considerable agglomeration whereas sawdust blends gave minor increase of PM10 under high pressure condition inside the combustion chamber. The pulverised-coal fineness, flue gas temperature and excess air were found to affect the particulate matter behaviour. The fly ash samples collected were also analysed by scanning electron microscope and spectrometry; alkali metals released were observed to react with the alumino-silicate phase. The fine sulphate enriched particles formation during combustion process was 4 modelled based on the Glarborg-Marshall mechanism using CFD tool. The simulation results were validated by the experimental data from the pilot-scale combustion test facility

Brg-1 mediates the constitutive and fenretinide-induced expression of SPARC in mammary carcinoma cells via its interaction with transcription factor Sp1

BACKGROUND: Secreted protein, acidic and rich in cysteine (SPARC) is a matricellular protein that mediates cell-matrix interactions. It has been shown, depending on the type of cancer, to possess either pro- or anti-tumorigenic properties. The transcriptional regulation of the SPARC gene expression has not been fully elucidated and the effects of anti-cancer drugs on this process have not been explored. RESULTS: In the present study, we demonstrated that chromatin remodeling factor Brg-1 is recruited to the proximal SPARC promoter region (-130/-56) through an interaction with transcription factor Sp1. We identified Brg-1 as a critical regulator for the constitutive expression levels of SPARC mRNA and protein in mammary carcinoma cell lines and for SPARC secretion into culture media. Furthermore, we found that Brg-1 cooperates with Sp1 to enhance SPARC promoter activity. Interestingly, fenretinide [N-4(hydroxyphenyl) retinamide, 4-HPR], a synthetic retinoid with anti-cancer properties, was found to up-regulate the transcription, expression and secretion of SPARC via induction of the Brg-1 in a dose-dependent manner. Finally, our results demonstrated that fenretinide-induced expression of SPARC contributes significantly to a decreased invasion of mammary carcinoma cells. CONCLUSIONS: Overall, our results reveal a novel cooperative role of Brg-1 and Sp1 in mediating the constitutive and fenretinide-induced expression of SPARC, and provide new insights for the understanding of the anti-cancer effects of fenretinide

LES PROFILS DE L’EMPLOI ET DE L’EMPLOYÉ DE MAISON EN RÉPUBLIQUE DÉMOCRATIQUE DU CONGO

En République Démocratique du Congo, le travail de maison s’apparente au travail au noir. En vue de définir les profils de l’emploi et de l’employé de maison nous avons formulé cinq hypothèses. L’une d’elles est en rapport avec le profil de l’employé et les quatre restantes visent le profil de l’emploi. Leur test a été réalisé avec deux indicateurs statistiques, notamment la médiane et le pourcentage, obtenus après avoir interrogé 190 employés de maison de Kinshasa avec un questionnaire. En effet, le personnel de maison congolais est généralement jeune, de genre féminin, scolarisé et de toute origine régionale et / ou ethnique. Il travaille à proximité de sa résidence. Il est vulnérable, car sans couverture sociale, sans défense de ses intérêts salariaux mais avec un contrat verbal donc impossible à retracer en cas de problème. Son travail est physiquement épuisant et mal rémunéré. Ce pessimiste portrait doit interpeller les législateurs congolais et nécessiter la précision des fondements juridico-sociaux de la relation entre employeur et employé pour protéger socialement l’emploi de maison et son occupant

Programmed cell death in the marine diatom Thalassiosira pseudonana triggered by culture age and nutrient starvation

硅藻是海洋浮游植物的重要组成类群和海洋初级生产力的主要贡献者，同时也是主要的赤潮种之一。因此，它的死亡对海洋生态系统结构、物质和能量循环有着极其重要的影响。 本文以中心纲硅藻-假微型海链藻（ThalassiosirapseudonanaHasleetHeimdal）为研究对象，从形态学、分子与生物化学、生理学三个水平，检测了假微型海链藻细胞在氮、磷、硅、铁饥饿和衰老过程中的细胞程序性死亡。在形态学上采用透射电子显微镜（Transmissionelectronmicroscopy）对5种培养条件下的细胞超微结构进行观察。在分子与生物化学水平上，采用脱氧核糖核酸末端转移酶（TdT）介导的dUTP...Diatoms are an important component of marine phytoplankton and a major contributor to marine primary productivity. They are also a major species results in red tide. Therefore, the death of diatoms has an important influence on marine ecosystem structure, matter and energy cycle. In this paper, we chose the centric diatom Thalassiosira pseudonana Hasle et Heimdal as an object of our research. The...学位：理学硕士院系专业：生命科学学院生物学系_水生生物学学号：2172009115211