Statistical equilibrium in simple exchange games I

Simple stochastic exchange games are based on random allocation of finite resources. These games are Markov chains that can be studied either analytically or by Monte Carlo simulations. In particular, the equilibrium distribution can be derived either by direct diagonalization of the transition matrix, or using the detailed balance equation, or by Monte Carlo estimates. In this paper, these methods are introduced and applied to the Bennati-Dragulescu-Yakovenko (BDY) game. The exact analysis shows that the statistical-mechanical analogies used in the previous literature have to be revised.Comment: 11 pages, 3 figures, submitted to EPJ

A correlation of optical, radio, and interplanetary records of solar events Final report

Correlation of optical, radio, and interplanetary records of solar event

Microeconomics of the ideal gas like market models

We develop a framework based on microeconomic theory from which the ideal gas like market models can be addressed. A kinetic exchange model based on that framework is proposed and its distributional features have been studied by considering its moments. Next, we derive the moments of the CC model (Eur. Phys. J. B 17 (2000) 167) as well. Some precise solutions are obtained which conform with the solutions obtained earlier. Finally, an output market is introduced with global price determination in the model with some necessary modifications.Comment: 15pp. Revised & a reference added. An appeal in Appendix-annex (section 8; not for publication) also added. Physica A (accepted for publication

Comparative Anatomy and Petrophysical Property Structure of Seaward- and Landward- Stepping Deltaic Reservoir Analogs, Ferron Sandstone, Utah

The recovery of natural gas from fluvial-deltaic reservoirs is governed by complex internal architectures. To aid in the translation of outcrop geology to reservoir equivalents, all existing Ferron outcrop, petrophysical, and subsurface data have been integrated into a geologic model of reservoir heterogeneity that compares and contrasts seaward- and landward-stepping stratigraphic cycles. Reservoir architecture varies in a predictable fashion between seaward- and landward-stepping stratigraphic cycles. Within seaward-stepping units, delta-front strata are highly compartmentalized by marine and marginal marine shales coincident with stratigraphic cycle, parasequence, and mouth-bar bounding surfaces. Coeval distributaries are volumetrically a minor component and are preserved as ribbon-like sand bodies encased in finer-grained strata. By contrast, within landward-stepping units, parasequences and component mouth-bar deposits are amalgamated into a lithologically homogeneous strike-elongate sand body. Coeval distributaries are volumetrically a major component and are preserved as a complex network of interconnected, lithologically diverse sand bodies. Internal heterogeneities, related to floodplain, abandoned channel fill, and mud-clast lag deposits, severely disrupt lateral and vertical continuity. Analysis of the Ferron gas field reveals that favorable sites for stratigraphic entrapment occur where proximal and distal portions of parasequences pinch out into lagoonal and marine mudstones, respectively.Bureau of Economic Geolog

GPS/GIS for Regulated Facilities in the EPA Region 6 International Border Area

The University of Texas at Austin, Bureau of Economic Geology (Bureau), conducted a 2-year project for the Environmental Protection Agency (EPA), Region 6, using real-time Global Positioning System (DGPS) technology to locate regulated facilities in Texas and New Mexico along the Mexico border. Accurate locations of these facilities are required to establish a Geographical Information System (GIS) that will provide State and Federal regulators with a more functional tool for their oversight responsibilities. The Texas Natural Resources Conservation Commission (TNRCC) and the New Mexico Environmental Department (NMED), along with EPA Region 6, provided records from their regulatory databases that include toxic release inventory, industrial waste producers/transporters, Superfund sites/landfills, and underground storage tanks. These facilities are described in 7,380 records within 10 databases. The goal of this project is to provide spatial data in ESRI's ArcInfo coverages on 1,000 to 1,500 facilities. Using a Pathfinder Basic Plus and an Omnistar receiver, a single fieldworker can collect as many as 18 sites per day in urban settings such as the city of El Paso, Texas, or about 27 sites per day in more rural areas such as Cameron County, Texas. To date, we have collected locational data on 1,116 facilities from 6 Texas counties and 1 New Mexico county that relate to 2,371 records across 10 regulatory databases. The coordinates for these facilities have been loaded into ArcInfo coverages. Efficient application of this technology has resulted in a much improved set of spatial data that can be used to link other records on these regulated facilities to actual locations portrayed in a GIS.Bureau of Economic Geolog

Chararcterization of Heterogeneity Style and Permeability Structure in Fluvial Reservoirs

The Cretaceous Acu Formation was investigated as an analog to a heterogeneous group of reservoirs having significant potential for reserve growth in the Potiguar Basin of Brazil. Architectural, lithologic, and petrophysical information was collected from an outcrop exposing a fluvially deposited sandstone body located in the state of Rio Grande do Norte, Brazil. Sedimentologic descriptions of the sandstone body were collected from a series of vertical transects spaced evenly across the outcrop. Stratal surfaces traced between transects were recorded on photomosaics. Measurements of permeability were obtained from each transect by use of a portable probe-style mechanical field permeameter. A cross-section depicting bedding architecture, sedimentologic attributes, and permeability values was constructed, and the information incorporated into a two-dimensional representation of reservoir architecture using Stratamodel's Stratigraphic Geocellular Modeling software (SGM). The SGM technique deterministically interpolates permeability data between transect locations using a lithologic or stratigraphic framework.Bureau of Economic Geolog

Estimation of Gas Permeabilities for the Maricopa Site, Arizona

Upward and downward migration of gases from waste-disposal facilities is a critical issue for low-level radioactive waste disposal. Gaseous radionuclides in low-level waste include H-3, C-14, and Rn-222. Upward migration of gases to the surface can be important, particularly during operation of the facility (Kozak and Olague, 1994). High tritium values (for example 1,100 TU at 24 m depth, 162 TU at 109 m depth) have been found adjacent to the Beatty site, Nevada, that cannot readily be explained by liquid or combined liquid and vapor transport (Prudic and Striegl, 1995; Striegl et al., 1996). Because disposal practices at Beatty varied in the past and included disposal of as much as 2,000 m3 of liquid waste, further research in tritium movement at Beatty is warranted. Transport mechanisms for gases include not only diffusion but also advection. Analysis of gas transport is important at many low-level waste disposal facilities as shown by the intensive program to monitor concentrations and concentration gradients of gaseous radionuclides proposed for the California low-level radioactive waste disposal facility (Harding Lawson & Assoc., 1991). Performance assessment calculations require information on parameters related to gas transport to predict long-term migration of gases in the subsurface. The purpose of this study is to evaluate different techniques of estimating gas transport parameters and monitoring subsurface gas migration. The objective of this study is to examine different techniques for evaluating gas permeability. Pneumatic pressure tests will be conducted to estimate vertical and horizontal air permeabilities at different levels. In addition, permeabilities will be calculated from atmospheric breathing data that will include evaluation of subsurface response to barometric pressure fluctuations. Computer simulations suggest that air from the surface can move several meters into the ground during typical barometric pressure cycles (Massmann and Farrier, 1992). Gas ports will be installed at different depths in two boreholes to evaluate atmospheric pumping. The results of this study will provide valuable information on subsurface gas transport processes and the various techniques to obtain data on parameters required for simulation of such processes. These data will be required for performance assessment calculations.Bureau of Economic Geolog

Peranan Lingkungan Terhadap Kejadian Malaria Di Kecamatan Silian Raya Kabupaten Minahasa Tenggara

: Malaria, an infectious disease, is still an issue for public health world-wide, including in Indonesia. Malaria is caused by Plasmodium Sp. which is transmitted by the Anopheles mosquito. Southeast Minahasa Regency has high malaria rate. This study aimed to know the role of the environment on the incidence of malaria in Silian Raya subdistrict, Southeast Minahasa regency. This was a descriptive survey. The population was the community in Silian Raya subdistrict, Southeast Minahasa regency with 194 respondents. The results showed that people in Silian Raya subdistrict mostly live around swamps, rice paddies, and rivers. This study also showed that only a few people of Silian Raya subdistrict who had pets, and fish ponds around their houses

Deteksi Transmisi Virus Dengue Pada Nyamuk Wild Aedes Aegypti Betina Di Kota Manado

: Dengue hemorrhagic fever is an acute disease with clinical manifestations of hemorrhage caused by dengue virus infection. Manado is endemic dengue. Dengue virus has the ability to maintain its existence in nature through horizontal and vertical transmission. There are several ways to detect the dengue virus by Reverse Transcription-Polymerase Chain Reaction (RT-PCR) and immunohistochemistry Streptavidin Biotin Peroxidase Complex (ISBPC). This research aims to determine the wild Aedes aegypti population in Manado and to detect dengue virus in wild mosquito Aedes aegypti by ISBPC methods. This was a descriptive survey study with a cross sectional design to describe the transmission of dengue virus in wild mosquito Aedes aegypti in the city of Manado. The results showed that there were 5 wild Aedes aegypti mosquitoes positive for dengue virus, and 36 wild Aedes aegypti mosquitoes negative containing dengue virus. Conclusion: Of the 41 samples immunohistochemistry tested, 5 samples showed dengue virus transmission in wild mosquito Aedes aegypti in Manado which is a positive possibility of horizontal transmission