Abstract
As part of this study, the problems in ensuring regional environmental safety have been identified, the features of the development of environmental information systems have been considered. ...In order to solve the identified problems, the main existing analogues of the developed system have been analyzed. The structure of the information-analytical system to ensure environmental safety in the region has been proposed. It contains such main modules as waste, air, water, soil, plants, animals, as well as the blocks contained in each module: reference and information, reports, monitoring. The main functionality provided is described for each module and corresponding block. In addition, the main tasks aimed at the implementation of the developed information-analytical system for ensuring environmental safety of the region are formulated.
This Letter presents measurements of the elliptic flow of charged particles as a function of pseudorapidity and centrality from Cu-Cu collisions at 62.4 and 200 GeV using the PHOBOS detector at the ...Relativistic Heavy Ion Collider. The elliptic flow in Cu-Cu collisions is found to be significant even for the most central events. For comparison with the Au-Au results, it is found that the detailed way in which the collision geometry (eccentricity) is estimated is of critical importance when scaling out system-size effects. A new form of eccentricity, called the participant eccentricity, is introduced which yields a scaled elliptic flow in the Cu-Cu system that has the same relative magnitude and qualitative features as that in the Au-Au system.
Abstract
The problem of production and consumer waste generation is one of the main environmental issues of industrial society. However, the main method of waste disposal in Russia is still its ...landfilling at waste disposal facilities (landfill deposits, authorized and unauthorized dumps). A separate group of waste disposal facilities consists of illegal unauthorized landfill sites with solid municipal waste. The specificity of these waste disposal facilities is the complexity of monitoring of their formation and the difficulty of assessing their impact on the environment and public health. At present, there is no standard approved methodology for assessing the environmental and social risks of illegal unauthorized landfill sites. For that purpose, the authors have developed a method for assessing the hazards of unauthorized landfill sites, based on comparing the actual characteristics of landfills obtained during field surveys of urban areas with certain tabular values. Initial keeping track of landfill sites is fulfilled with the application of a web portal that implements geoinformational technologies. The use of the web portal for rapid detection of illegal unauthorized landfill sites, as well as the author’s method and soft-ware that implements this method allows for rapid assessment of the environmental and social hazard of landfills based on data from field surveys of urban areas without laboratory measurements. The results obtained are intended for the classification of illegal landfill sites in order to develop plans for their elimination, taking into account the priorities of environmental policy.
In relativistic heavy-ion collisions, anisotropic collective flow is driven, event by event, by the initial eccentricity of the matter created in the nuclear overlap zone. Interpretation of the ...anisotropic flow data thus requires a detailed understanding of the effective initial source eccentricity of the event sample. In this paper, we investigate various ways of defining this effective eccentricity using the Monte Carlo Glauber (MCG) approach. In particular, we examine the participant eccentricity, which quantifies the eccentricity of the initial source shape by the major axes of the ellipse formed by the interaction points of the participating nucleons. We show that reasonable variation of the density parameters in the Glauber calculation, as well as variations in how matter production is modeled, do not significantly modify the already established behavior of the participant eccentricity as a function of collision centrality. Focusing on event-by-event fluctuations and correlations of the distributions of participating nucleons, we demonstrate that, depending on the achieved event-plane resolution, fluctuations in the elliptic flow magnitude v{sub 2} lead to most measurements being sensitive to the root-mean-square rather than the mean of the v{sub 2} distribution. Neglecting correlations among participants, we derive analytical expressions for the participant eccentricity cumulants as a function of the number of participating nucleons, N{sub part}, keeping nonnegligible contributions up to O(1/N{sub part}{sup 3}). We find that the derived expressions yield the same results as obtained from mixed-event MCG calculations which remove the correlations stemming from the nuclear collision process. Most importantly, we conclude from the comparison with MCG calculations that the fourth-order participant eccentricity cumulant does not approach the spatial anisotropy obtained assuming a smooth nuclear matter distribution. In particular, for the Cu+Cu system, these quantities deviate from each other by almost a factor of 2 over a wide range in centrality. This deviation reflects the essential role of participant spatial correlations in the interaction of two nuclei.
Abstract
Within the framework of this study, some specific features of monitoring the earth surface pollution from unauthorized waste disposal facilities are considered. Some methods of remote ...sensing of the earth surface designed to obtain information about the sources of its pollution are analyzed. A system of infrared remote detection of unauthorized waste disposal facilities is proposed. The system consists of a set of optical lenses, an infrared lens, a scanning device, a photodetector, an amplifier, a preamplifier, an incoming signal processing unit, a GPS signal receiver and a device for processing and outputting the received information. The system is installed in small mobile aircrafts, which makes it possible to study the contamination of the earth surface from unauthorized waste disposal facilities in suburban areas. Thus, the purpose of this study is to increase the effectiveness of monitoring the contamination of the earth surface from unauthorized waste disposal facilities outside the city limits by means of the developed system.
The present study considers the negative impact of solid municipal waste landfills on the environment and public health. It also assesses hazard to public health caused by the impact of solid ...municipal waste landfill emissions (by the example of a solid household landfill in the city of Kursk). We have carried out four interrelated stages of research work during the implementation of public health hazard assessment of the municipal waste landfill under study: hazard identification, assessment of dose-response relationship, exposure assessment, and risk characterization. At each stage, we assessed uncertainties that might affect the completeness and accuracy of final conclusions and recommendations. A particular attention was paid to some specific uncertainties that are due to the peculiarities of waste landfills' operation. These uncertainties can have a significant impact on the results of the study, especially in terms of emissions' quantitative composition. Thus, despite the fact that the risk level of the solid municipal waste landfill under study was assessed as low, the authors propose the introduction of a degassing system at the solid municipal waste landfill in Kursk. The application of this system will eliminate the release of biogas into the atmosphere, reduce the load on the air and reliably decrease hazard to public health caused by the impact of the landfill.
We report on measurements of directed flow as a function of pseudorapidity in Au + Au collisions at energies of square root of SNN = 19.6, 62.4, 130 and 200 GeV as measured by the PHOBOS detector at ...the BNL Relativistic Heavy Ion Collider. These results are particularly valuable because of the extensive, continuous pseudorapidity coverage of the PHOBOS detector. There is no significant indication of structure near midrapidity and the data surprisingly exhibit extended longitudinal scaling similar to that seen for elliptic flow and charged particle pseudorapidity density.
We present the first measurements of the pseudorapidity distribution of primary charged particles in Cu+Cu collisions as a function of collision centrality and energy, sqrts_{NN}=22.4, 62.4, and 200 ...GeV, over a wide range of pseudorapidity, using the PHOBOS detector. A comparison of Cu+Cu and Au+Au results shows that the total number of produced charged particles and the rough shape (height and width) of the pseudorapidity distributions are determined by the number of nucleon participants. More detailed studies reveal that a more precise matching of the shape of the Cu+Cu and Au+Au pseudorapidity distributions over the full range of pseudorapidity occurs for the same N{part}/2A rather than the same N_{part}. In other words, it is the collision geometry rather than just the number of nucleon participants that drives the detailed shape of the pseudorapidity distribution and its centrality dependence at RHIC energies.
Results are presented from searches for the standard model Higgs boson in proton–proton collisions at s=7 and 8 TeV in the Compact Muon Solenoid experiment at the LHC, using data samples ...corresponding to integrated luminosities of up to 5.1 fb−1 at 7 TeV and 5.3 fb−1 at 8 TeV. The search is performed in five decay modes: γγ, ZZ, W+W−, τ+τ−, and bb¯. An excess of events is observed above the expected background, with a local significance of 5.0 standard deviations, at a mass near 125 GeV, signalling the production of a new particle. The expected significance for a standard model Higgs boson of that mass is 5.8 standard deviations. The excess is most significant in the two decay modes with the best mass resolution, γγ and ZZ; a fit to these signals gives a mass of 125.3±0.4(stat.)±0.5(syst.) GeV. The decay to two photons indicates that the new particle is a boson with spin different from one.
Experimental studies of the collisions of heavy nuclei at relativistic energies have established the properties of the quark–gluon plasma (QGP), a state of hot, dense nuclear matter in which quarks ...and gluons are not bound into hadrons1–4. In this state, matter behaves as a nearly inviscid fluid5 that efficiently translates initial spatial anisotropies into correlated momentum anisotropies among the particles produced, creating a common velocity field pattern known as collective flow. In recent years, comparable momentum anisotropies have been measured in small-system proton–proton (p+p) and proton–nucleus (p+A) collisions, despite expectations that the volume and lifetime of the medium produced would be too small to form a QGP. Here we report on the observation of elliptic and triangular flow patterns of charged particles produced in proton–gold (p+Au), deuteron–gold (d+Au) and helium–gold (3He+Au) collisions at a nucleon–nucleon centre-of-mass energy \\sqrt {s_{{\mathrm{NN}}}\ = 200 GeV. The unique combination of three distinct initial geometries and two flow patterns provides unprecedented model discrimination. Hydrodynamical models, which include the formation of a short-lived QGP droplet, provide the best simultaneous description of these measurements.
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