Browsing by Issue Date, starting with "2016-10-06"
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- Efeito do stress térmico na produção e reprodução em ovelhas de leitePublication . Gomes, Susana Patrícia Mendes; Pereira, Rosa Maria Lino NetoNos últimos anos têm ocorrido alterações climatéricas, acentuando-se a existência de uma época muito quente e seca e, outra, mais fria ou chuvosa, o que penaliza a agricultura incluindo a produção animal. Estas alterações originam um decréscimo da produção de alimentos tanto para o verão como para o inverno. Os ovinos são uma espécie animal tolerante à variação de temperatura com uma termoneutralidade entre os 5-28ºC. Temperaturas superiores têm uma grande influência na sua produção e reprodução, especialmente nos animais de aptidão leiteira. Durante os períodos de stress térmico, podem ser implementadas diferentes estratégias para a manutenção da homeotermia e simultaneamente da produção dos litros de leite esperados com a mesma qualidade. Assim poderá ser necessário realizar alterações do horário de alimentação, ou seja, realizar alimentação completa ao final da tarde, se necessário otimizar com complementos minerais e antioxidantes, ter locais sombrios e arejados para os animais descansarem e manterem o seu bem-estar. A nível reprodutivo, as fases mais afetadas pelo excesso de calor são a folicologénese bem como a oogénese e a espermatogénese. A alimentação pobre aliada ao excesso de calor durante a gestação induz retardamento do crescimento fetal e pouca viabilidade nos recém nascidos. A aposta na genética é essencial, pois outra estratégia é realizar cruzamentos de animais mais resistentes ao calor, diminuindo as adversidades causadas pelo stress térmico.
- The spin structure of the proton at low $x$ and low $Q^2$ in two-dimensional bins from COMPASSPublication . Nunes, A.S.The longitudinal double spin asymmetries $A_1^p$ and the spin dependent structure function of the proton $g_1^p$ were extracted from COMPASS data in the region of low Bjorken scaling variable $x$ and low photon virtuality $Q^2$. The data were taken in 2007 and 2011 from scattering of polarised muons off polarised protons, resulting in a sample that is 150 times larger than the one from the previous experiment SMC that pioneered studies in this kinematic region. For the first time, $A_1^p$ and $g_1^p$ were evaluated in this region in two-dimensional bins of kinematic variables: $(x,Q^2)$, $(\nu ,Q^2)$, $(x,\nu)$ and $(Q^2,x)$. The following kinematic region was investigated: $4\times 10^{-5}
- An evaluation of GPUs for use in an upgraded ATLAS High Level TriggerPublication . Delgado, A.T.; Conde Muno, P.; Soares, J. Augusto; Goncalo, R.; Baines, J.; Bold, T.; Emeliyanov, D.; Kama, S.; Bauce, M.; Messina, A.; Negrini, M.; Sidoti, A.; Rinaldi, L.; Tupputi, S.; Greenwood, Z.D.; Elliott, A.; Laosooksathit, S.ATLAS is a general purpose particle physics experiment located on the LHC collider at CERN. The ATLAS Trigger system consists of two levels, the first level (L1) implemented in hardware and the High Level Trigger (HLT) implemented in software running on a computing cluster of commodity CPUs. The HLT reduces the trigger rate from the 100 kHz L1 accept rate to 1 kHz for recording, requiring an average per-event processing time of ~300 ms for this task. The HLT selection is based on reconstructing tracks in the Inner Detector and Muon Spectrometer and clusters of energy deposited in the calorimeters (electromagnetic and hadronic). Performing this reconstruction within the available HLT computing cluster resources presents a significant challenge. Future HLT upgrades will result in higher detector occupancies and, consequently, will harden the reconstruction constraints. General purpose Graphics Processor Units (GPGPU) are being evaluated for possible future inclusion in an upgraded HLT computing cluster. We report on a demonstrator that has been developed consisting of GPGPU implementations of the calorimeters clustering and Inner Detector and Muon tracking algorithms integrated within the HLT software framework. We give a brief overview of the algorithm implementation and present preliminary measurements comparing the performance of the GPGPU algorithms with the current CPU versions.
- Investigación de mercados para implementación de energía fotovoltaica en la ciudad de en Florencia - CaquetáPublication . Belalcazar Choachi, Cristhian David; Ferreira, MafaldaEl consumo no moderado del agua fuente vital para subsistir y recurso principal para la generación de energía hidráulica la cual se consume a diario en el país y la poca consciencia que se tiene sobre este recurso que es limitado, hace que se genere la interrogante que se trabaja en este proyecto ”Investigación de mercados para implementación de energía fotovoltaica en la ciudad de en Florencia – Caquetá” se enfoca a la mejor manera de llegar a una sociedad e implementar un producto que se genera energía limpia y que no está consumiendo ningún recurso natural o vital, donde no se ve afectado el medio ambiente al contrario ayuda a preservarlo. Dentro de este proyecto de disertación se generaron estrategias de marketing tanto Off line y On line con la cual se pretende llegar a un mercado meta y medir la aceptación e implementación de paneles solares supliendo así el consumo de la energía convencional.
- Polarised Drell-Yan Process in the COMPASS ExperimentPublication . Quaresma, MarciaThe COMPASS collaboration at CERN has been contributing to the knowledge of the nucleon structure and its description in terms of the transverse momentum dependent PDFs, accessed through the SIDIS process. In 2014/2015 the data taking was dedicated to the polarised Drell-Yan (DY) measurement with a negative pion beam and a transversely polarised proton target, as well as unpolarised nuclear targets. These data are now being analysed. One of the main goals is to verify the predicted sign change of the Sivers distribution function when accessed from DY with respect to SIDIS. The details on the experimental setup, the covered phase space, a preliminary first look into data distributions and predictions for the full data sample will be presented.
- Search for bottom squark pair production in proton–proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detectorPublication . ATLAS collaboration (2859 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Cantrill, Robert; Carvalho, João; Castro, Nuno Filipe; Conde Muiño, Patricia; Da Cunha Sargedas De Sousa, Mario Jose; Fiolhais, Miguel; Galhardo, Bruno; Gomes, Agostinho; Gonçalo, Ricardo; Jorge, Pedro; Lopes, Lourenco; Machado Miguens, Joana; Maio, Amélia; Maneira, José; Oleiro Seabra, Luis Filipe; Onofre, António; Pedro, Rute; Santos, Helena; Saraiva, João; Silva, José; Tavares Delgado, Ademar; Veloso, Filipe; Wolters, HelmutThe result of a search for pair production of the supersymmetric partner of the Standard Model bottom quark ( $\tilde{b}^{1} $ ) is reported. The search uses 3.2 fb$^{-1}$ of pp collisions at $\sqrt{s}=13$ TeV collected by the ATLAS experiment at the Large Hadron Collider in 2015. Bottom squarks are searched for in events containing large missing transverse momentum and exactly two jets identified as originating from b-quarks. No excess above the expected Standard Model background yield is observed. Exclusion limits at 95 % confidence level on the mass of the bottom squark are derived in phenomenological supersymmetric R-parity-conserving models in which the $\tilde{b}^{1} $ is the lightest squark and is assumed to decay exclusively via $\tilde{b}^{1} \rightarrow b \tilde{\chi }^{01}$ , where $\tilde{\chi }^{01}$ is the lightest neutralino. The limits significantly extend previous results, bottom squark masses up to 800 (840) GeV are excluded for the $\tilde{\chi }^{01}$ mass below 360 (100) GeV whilst differences in mass above 100 GeV between the $\tilde{b}^{1}$ and the $\tilde{\chi }^{01}$ are excluded up to a $\tilde{b}^{1} $ mass of 500 GeV.