Current Issue : April - June Volume : 2013 Issue Number : 2 Articles : 7 Articles
By applying the hydrogen index values obtained from S2 versus TOC graph and mass balance calculations obtained from the results of Rock-Eval pyrolysis, the original hydrocarbon generative capacity and the amounts of the hydrocarbons generated are estimated. For calculations and comparison, two methods were applied (Claypool et al. 1998 and Schmoker 1994) for 30 organic rich samples representative Kharita and Khatatba formations, from wells IF 37-7 and S. Dabaa 11-1. Such formations are characterized by gas/oil prone source rock (Type III/II kerogen) with different thermal maturities. Calculation results indicate that the amounts of original hydrocarbons and the hydrocarbon generative capacities of the two methods are similar and not correlated with the results of the Rock-Eval pyrolysis....
The shear wave velocity dependence on porosity was modelled using percolation theory model for the shear modulus porosity dependence. The obtained model is not a power law dependence (no simple scaling with porosity), but a more complex equation. Control parameters of this equation are shear wave velocity of bulk solid, percolation threshold of the material and the characteristic power law exponent for shear modulus porosity dependence. This model is suitable for all porous materials, mortars and porous rocks filled with liquid or gas. In the case of pores filled with gas the model can be further simplified: The term for the ratio of the gas density to the density of solid material can be omitted in the denominator (the ratio is usually in the range of (10-4, 10-3) for all solids). This simplified equation was then tested on the experimental data set for porous ZnO filled with air. Due to lack of reasonable data the scientists are encouraged to test the validity of proposed model using their experimental data....
Numerous studies have attempted to solve the problems constraining the sustainable utilization of nuclear power, for example,\r\nthe already accumulated HLWs, the worsening environment due to greenhouse emissions, the questionable reliability of natural\r\nuranium resources, and the argument over nuclear safety, which are certainly top issues to be addressed. A well-organized nuclear\r\nfuel cycle system is the basis for nuclear power sustainability. Therefore, which type of reactor to be employed and whether or not\r\nto adopt a reprocessing technique for spent fuel are two key issues to be addressed. A Sodium Fast Reactor (SFR), a Generation IV\r\nreactor, has gained considerable attention worldwide. SFR recycling coupled to pyroprocessing, a so-called Pyro-SFR Recycling,\r\nshows promising advantages, and therefore, this paper focuses on exploring a strategy of how to realize it, which can offer\r\ninformative procedures for a better use of nuclear power. A dynamic model has been developed to quantitatively analyze a countryspecific\r\ncase employing two scenarios, a once-through and Pyro-SFR, for a comprehensive comparison, especially focusing on the\r\nuranium utilization, the HLWreduction, and the electricity generation cost....
This paper describes the development of a multidimensional population balance model (PBM) which can account for the dynamics of a continuous powder mixing/blending process. The PBM can incorporate the important design and process conditions and determine their effects on the various critical quality attributes (CQAs) accordingly. The important parameters considered in this study are blender dimensions and presence of noise in the inlet streams. The blender dynamics have been captured in terms of composition of the ingredients, (relative standard deviation) RSD, and (residence time distribution) RTD. PBM interacts with discrete element modeling (DEM) via one-way coupling which forms a basic framework for hybrid modeling. The results thus obtained have been compared against a full DEM simulation which is a more fundamental particle-level model that elucidates the dynamics of the mixing process. Results show good qualitative agreement which lends credence to the use of coupled PBM as an effective tool in control and optimization of mixing process due to its relatively fewer computational requirements compared to DEM....
Nonlinear performance characteristics of 3-phase flux-switching permanent magnet motors (FSPM) are overviewed. These machines show advantages of a robust rotor structure and a high energy density. Research on the FSPM is predominated by topics such as modeling and machine comparison, with little emphasis given on its performance and limits. Performance characteristics include phase flux linkage, phase torque, and phase inductance. In the paper, this analysis is done by a cross-correlation of rotor position and armature current. Due to the high amount of processed data, which cannot be handled analytically within an acceptable time period, a multistatic 2D finite element model (FEM) is used. For generalization, the most commonly discussed FSPM topology, 12/10 FSPM, is chosen. Limitations on the motor performance due to the saturation are discussed on each characteristic. Additionally, a focused overview is given on energy conversion loops and dq-axes identification for the FSPM....
Wind and solar energies are the alternative energy sources that can be used to supplement the conventional energy sources\r\nparticularly in Bangladesh. In this work, the aim is to assess the current wind and solar energy potential in Bangladesh. The wind\r\ndata for the five stations obtained from Local Government Engineering Department have been assessed, but only two of them\r\nseem to be eligible for energy production. Annual average, monthly average, and hourly average wind speeds and wind power\r\ndensities were calculated from the wind data. The Weibull distribution parameters (c and k), the dominant wind directions, and\r\nthe frequency distributions were also determined. Experimentally measured solar radiation data are not available over Bangladesh.\r\nMeasured climatological data such as cloud cover and sunshine duration data of Bangladesh Meteorological Department from\r\n1992 to 2001 used for the estimation of global solar radiation as they are correlated. Technoeconomic feasibility analysis is done for\r\n100kW grid connected wind and solar photovoltaic (PV) systems. Renewable-energy-based system will bring more environmental\r\nbenefits than conventional power in terms of human health, reduction of air pollution, and decrease of noise, and so forth.\r\nHowever, in the above estimation, these were not considered....
The availability of short-term forecast weather model for a particular country or region is essential for operation planning of\r\nenergy systems. This paper presents the first step by a group of researchers at UAE University to establish a weather model for\r\nthe UAE using the weather data for at least 10 years and employing various models such as classical empirical models, artificial\r\nneural network (ANN) models, and time-series regression models with autoregressive integrated moving-average (ARIMA). This\r\nwork uses time-series regression with ARIMA modeling to establish a model for the mean daily and monthly global solar radiation\r\n(GSR) for the city of Al-Ain, United Arab Emirates. Time-series analysis of solar radiation has shown to yield accurate average\r\nlong-term prediction performance of solar radiation in Al-Ain. The model was built using data for 10 years (1995ââ?¬â??2004) and\r\nwas validated using data of three years (2005ââ?¬â??2007), yielding deterministic coefficients (R2) of 92.6% and 99.98% for mean daily\r\nand monthly GSR data, respectively. The low corresponding values of mean bias error (MBE), mean absolute bias error (MABE),\r\nmean absolute percentage error (MAPE), and root-mean-square error (RMSE) confirm the adequacy of the obtained model for\r\nlong-term prediction of GSR data in Al-Ain, UAE....
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