1,152 research outputs found

    Quality assurance for the ALICE Monte Carlo procedure

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    We implement the already existing macro,$ALICE_ROOT/STEER /CheckESD.C that is ran after reconstruction to compute the physics efficiency, as a task that will run on proof framework like CAF. The task was implemented in a C++ class called AliAnalysisTaskCheckESD and it inherits from AliAnalysisTaskSE base class. The function of AliAnalysisTaskCheckESD is to compute the ratio of the number of reconstructed particles to the number of particle generated by the Monte Carlo generator.The class AliAnalysisTaskCheckESD was successfully implemented. It was used during the production for first physics and permitted to discover several problems (missing track in the MUON arm reconstruction, low efficiency in the PHOS detector etc.). The code is committed to the SVN repository and will become standard tool for quality assurance.Comment: 7 pages, 7 figure

    Honey bee colony losses: Why are honey bees disappearing?

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    The Western honey bee (Apis mellifera L., Hymenoptera: Apidae) is a species of crucial economic, agricultural and environmental importance.In the last ten years, some regions of the world have suffered from a significant reduction of honey bee colonies. In fact, honey bee losses are not an unusual phenomenon, but in many countries worldwide there has been a notable decrease in honey bee families. The cases in the USA, in many European countries, and in the Middle East have received considerable attention, mostly due to the absence of an easily identifiable cause.It has been difficult to determine the main factors leading to colony losses because of honey bees’ diverse social behavior. Moreover, in their daily routine, they make contact with many agents of the environment and are exposed to a plethora of human activities and their consequences. Nevertheless, a number of different factors are considered to be contributing to honey bee losses, and recent investigations have established some of the most important ones, in particular, pests and diseases, bee management, including bee keeping practices and breeding, the change in climatic conditions, agricultural practices, and the use of pesticides. The global picture highlights the ectoparasitic mite Varroa destructor as a major factor in colony loss. Last but not least, microsporidian parasites, mainly Nosema ceranae, also contribute to the problem.Thus, it is obvious that many factors are involved in honey bee colony losses globally. Increased monitoring and scientific research should throw new light on the factors involved in recent honey bee colony losses.This review focuses on the main factors which have been found to have an impact on the increase in honey bee colony losses

    Instalation For Induction Heating For Testing Thermo Sensors

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    With constant development and improvement of management systems in modern technological processes, in cars, in production lines and machinery and other fields are increasingly entering the use of different sensors. These sensors are tested on special test simulators, simulating the conditions for a long time close to their work. Often the temperature is in the range of 700-900°C. To achieve these temperatures, most environmentally safe and effective heating of the sensors can be achieved by induction heating of housing them. The object of this report is installation for induction heating system as part of the simulator to test the vibration and temperature thermal sensors

    Effects for global agriculture of country-specific climate policy regimes with a focus on methane

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    While countries have agreed in the Paris-agreement on common rules to report GHG emissions, the design of domestic climate policy regimes remains in the national domain. This may cause different carbon prices for climate gasses across countries, between a country's emission sectors, and within the same sector. Our focus is on methane, which is a major emitter from agriculture, but also linked to livestock farming which is a core activity in agriculture worldwide. We analyse the potential effects of domestic carbon pricing regimes for agriculture in a non-cooperative game theoretic setting using a global agricultural sector model. Our results indicate no ‘race to the bottom’ to apply carbon pricing regimes that result in lowest implicit carbon prices for methane. Enforcing a uniform regime can reduce additional global warming with up to 0.02 °C, but runs the risk of agreeing to lower emission cuts than a nationally determined choice would suggest.Effects for global agriculture of country-specific climate policy regimes with a focus on methanepublishedVersio

    Measurement of Casein Micelle Size in Raw Dairy Cattle Milk by Dynamic Light Scattering

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    The particle size of milk influences its microstructure and defines the qualities of dairy products, such as colloidal stability and texture. Moreover, differences in casein micelle size may affect milk processing, especially cheese making. Hence, the size of casein micelle is an important characteristic of raw milk and determines the yield of dairy products. The aim of the present research is to estimate the casein micelle size in the raw milk of dairy cattle by dynamic light scattering. The obtained results may be used for genetic elaboration of the breed, as well as to increase the competitiveness of the milk industry by selection of animals with higher casein micelle size

    Methods for Genotyping of the Honey Bee (Apis mellifera L.: Hymenoptera: Apidae) in Bulgaria

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    Honey bees are insects of great biological, ecological, and economic importance. They are the subject of a variety of scientific studies. As social insects, they are a preferred and widely used model for clarification of the evolution of social behavior. Because of the haplodiploidy as a mechanism for determining gender, differentiation in the functions of individuals in the bee family, and for its economic importance, Apis mellifera is a significant subject of research in the fields of ontogeny, population genetics, and selective breeding. The biological significance of bees is rooted in the fact that they are main pollinators in the natural environment. About 80% of the pollination of entomophilous plants is carried out by Apis mellifera. In all crops, active pollination significantly increases their yields. Honey bees are a valuable economic asset due to the ensemble of their products, which include honey, bee pollen, propolis, royal jelly, and bee venom, used by humans for food and treatment. The main objective of this chapter was to describe the basic methods used for genotyping of Apis mellifera in Bulgaria. These techniques have been useful to produce a system of population criteria, and taxonomically important molecular markers are applicable in future activities related to the preservation and selection of the Bulgarian honey bee

    Integration and instrument characterization of the cosmic infrared background experiment 2 (CIBER-2)

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    The extragalactic background light (EBL) is the integrated emission from all objects outside of the Milky Way galaxy. Imprinted by the history of stellar emission, the EBL in the near infrared traces light back to the birth of the first stars in the Universe and can allow tight constraints on structure formation models. Recent studies using data from the Spitzer Space Telescope and the first Cosmic Infrared Background ExpeRiment (CIBER-1) find that there are excess fluctuations in the EBL on large scales which have been attributed to either high redshift galaxies and quasars, or to stars that were stripped from their host galaxies during merging events. To help disentangle these two models, multi-wavelength data can be used to trace their distinctive spectral features. Following the success of CIBER-1, CIBER-2 is designed to identify the sources of the EBL excess fluctuations using data in six wavebands covering the optical and near infrared. The experiment consists of a cryogenic payload and is scheduled to launch four times on a recoverable sounding rocket. CIBER-2 has a 28.5 cm telescope coupled with an optics system to obtain wide-field images in six broad spectral bands between 0.5 and 2.5 μm simultaneously. The experiment uses 2048 × 2048 HAWAII-2RG detector arrays and a cryogenic star tracker. A prototype of the cryogenic star tracker is under construction for a separate launch to verify its performance and star tracking algorithm. The mechanical, optical, and electrical components of the CIBER-2 experiment will have been integrated into the payload by mid-2018. Here we present the final design of CIBER-2 and our team’s instrument characterization efforts. The design and analysis of the optical focus tests will be discussed. We also report on the performance of CIBER-2 support systems, including the cooling mechanisms and deployable components. Finally, we outline the remaining tasks required to prepare the payload for launch
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