Avanti Publishers
Not a member yet
711 research outputs found
Sort by
Application of Remote Sensing and Geographic Information Systems on Water Resources Management
Get PDF Water is a primary source of life and is required in sufficient quantity and acceptable quality to sustain all human activities such as domestic, agricultural and industrial needs. This requirement however, is hardly fulfilled due to various natural and anthropogenic activities. Remote sensing and Geographic Information System (GIS) techniques are useful in hydrological research and applications. Remote sensing observations enable improved characterization of the land surface which are relevant in hydrological studies. Remote sensing with its merits of providing spatially extensive, multi-temporal and cost effective data, has become a very handy tool in identifying hydrogeological processes. These studies have revealed the application of integrated remote sensing and GIS technologies in groundwater exploration and exploitation. Integrated remote sensing and GIS are widely used in groundwater mapping. Locating potential groundwater targets is becoming more convenient, cost effective than invasive methods and efficient with the advent of a number of satellite imagery. The nature of remote sensing-based groundwater exploration is to delineate all possible features connected with localization of groundwater. Data, driven out of remote sensing, support decisions related to sustainable development and groundwater management. Integration of remotely sensed data, GPS, and GIS technologies provides a valuable tool for monitoring and assessing water pollution. Remotely sensed data can be used to create a permanent geographically located database to provide a baseline for future comparisons hydrological studies. The integrated use of remotely sensed data, GPS, and GIS will enable consultants and natural resource managers to develop management plans for a variety of natural resource management applications
The Cause-Forming Analysis of Shangping Tungsten Deposit
Get PDF The forming of each deposit has its objective and natural conditions. Different deposits have different types because their conditions and environments are different. This paper analyzed and discussed the cause of Shangping tungsten deposit. Firstly, it is the district background. Secondly, it is the geological characteristics and the age of the deposit. We think that the deposit is the zoning deposit of intermittently reverse precipitation from the pegmatite petrography to the hydrothermal solution stage gradually from the whole developing process. And this is a more complicated high temperature hydrothermal solution deposit of (FeMn) WO4 and quartz with thin-vein type from the characteristics of the deposit. The cause classification from different was is new and original in the paper. Its aim is to finding out the distribution regulation of the tungsten deposit and to serve for directing mine production and prospecting bitterly
Does Sea-Water pH Influence Carbon and Oxygen Isotopic Composition of Modern Planktic Foraminiferal Species Globigerina Bulloides in South West Indian Ocean?
Get PDF Present study aims to understand the possible influence of changing sea-water pH on the isotopic composition (δ18O and δ13C) of modern planktic foraminiferal shell in twenty three surface sediment samples (including grab and core tops of piston and gravity cores), collected along a north-south trending transect in the western Indian Ocean. The results, though initial indicate that the isotopic values (δ18O and δ13C) in general increase as the sea-water becomes less alkaline. It suggests that the sea-water pH also appears to influence isotopic values of planktic foraminiferal species G. bulloides, besides other factors influencing isotopic values in planktic foraminiferal shell
The Determination of Shale Gas Absolute Adsorption Basing on Molecular Dynamics Simulation
Get PDF The adsorption experimental isotherms developed for excess adsorption of supercritical gases with the appearance of a distinct maximum and quick decrease cannot be explained with the base of the classic adsorption theory developed for absolute adsorption. The key of describing the adsorption of supercritical gases with classical adsorption theory is the correct conversion of the quantity of absolute adsorption and excess adsorption. According to Gibbs definition of adsorption, accurate evaluation of the adsorbed phase density is the key of the correct conversion of the quantity of absolute adsorption and excess adsorption. Based on the principle of molecular dynamics and the application of molecular simulation, it simulates the density of supercritical methane under 0 to 50 MPa, and the calculation results are in accordance with National Institute of Standards and Technology (NIST) data. Based on this, combined with the single molecular adsorption theory, it puts forward a new method of conversion of the quantity of absolute adsorption and excess adsorption that can be applied to a great range of pressure. This method has higher accuracy, and breaks through the existing conversion methods with limit of low pressure conditions
High Lipase Production from Geotrichum candidum in Reduced Time using Cottonseed Oil: Optimization, Easy Purification and Specificity Characterization
Get PDFDespite the wide variety of potential applications of lipases within industrial processes, the high cost of production and purification is still their main limiting factor. The aim of this work is to optimize the production of Geotrichum candidum lipase (GCL) using submerged fermentation with a combination of statistical experimental design and surface methodology analysis, in order to give a higher production within a shorter time at the lowest possible cost and easy purification. Cottonseed oil, a low-cost by-product of cotton processing, was used as both an inducer and a carbon source. A maximum lipase activity of 27.17 IUmL-1 was achieved after 30h fermentation in a 5L stirred tank bioreactor under optimal conditions: 2.3% (m/v) of casein peptone, 0.8% (v/v) of cottonseed oil and 0.05% (m/v) of MgSO4 and NaNO3. The lipase purification in a single step by immobilization on PHB particles was verified. The combination of these two steps allowed a significant decrease in this lipase cost of production. Moreover, the produced lipase showed high specificity to hydrolyze long-chain fatty acids with cis-9 double bonds, such as oleic and linoleic acids, having an excellent potential for modifying oils in order to produce different bio-products in industrial applications
Derivation of a Cropping System Transfer Function for Weed Management: Part 2 – Microwave Weed Management
Get PDF System behaviour is described by transfer functions, which relate the system’s output to one or more input parameters. This paper derives the transfer function for crop yield potential as a function of applied microwave energy for control of weeds. The resulting transfer function reveals that microwave weed control and soil treatment can increase normalized crop yield potential above the ideal weed free potential. It also revealed that there was an ongoing yield advantage associated with a once off microwave soil treatment to deplete the weed seed bank
Determination of Activity Concentrations of the Naturally Occurring Radionuclides and the dose Rates from the Samples Collected from the Chittagong Urea Fertilizer Limited (CUFL), Bangladesh
Get PDFAbstract: The activity concentrations of 238U, 232Th and 40K have been determined for solid, liquid and product (urea) samples collected from the Chittagong Urea Fertilizer Limited (CUFL), Chittagong, Bangladesh. A total of 15 samples of different kinds were analyzed by using a calibrated high purity germanium (HpGe) detector of relative efficiency of 38%. For solid samples, the mean activity concentrations of 238U, 232Th and 40K have been found 78.67±2.87, 59.74±2.27 and 463.71±9.16 Bq/Kg, respectively. The mean activity concentrations of product samples for the corresponding radionuclide were 73.12±2.83, 74.59±2.32 and 391.58±9.38 Bq/Kg, respectively. For the case of liquid samples, the mean activity concentrations for the same nuclides were 25.09±1.71, 11.34±1.55 and 39.59±1.49 Bq/Kg, respectively. The artificial radionuclide 137Cs was not detected in any of the samples. The mean radiological hazard parameter values of outdoor absorbed dose rate, indoor absorbed dose rate, external radiation hazard, internal radiation hazard, annual effective dose equivalent, radium equivalent activity and representative level index were 95.72±9.04, 114.32±9.11 nGyh-1, 0.530±.05, 0.7±50.05, 113.59±11.41μSvy-1, 199.80±17.41 and 1.390±.14 Bq/Kg respectively, in solid samples. For the product samples, the mean values of the corresponding radiological indices were 97.10+9.71, 117.56+10.32 nGyh-1, 0.57±0.05 , 0.76±0.06, 119.50 ±11.72μSvy-1 , 209.50±17.72 and 1.50±0.14 Bq/Kg, respectively. Also in the liquid samples, the mean values for the corresponding radiological parameters were 18.43±2.69, 22.13±2.77 nGy.h−1, 0.12±0.03 , 0.19±0.05, 23.59± 2.36 μSvy1, 43.65±3.54 and 0.32±0.03 Bq/Kg, respectively. The obtained results of this study show that for some samples the values are lower and for the remaining are higher than the World average values. The mean representative index value is less than unity which confirms that the area is safe for the factory workers and the public nearby. The results can be used as a baseline data for further researchers
Forward Stability of Iterative Refinement with a Relaxation for Linear Systems
Get PDF Stability analysis of Wilkinson’s iterative refinement method IR(ω) with a relaxation parameter ω for solving linear systems is given. It extends existing results for ω=1, i.e., for Wilkinson’s iterative refinement method. We assume that all computations are performed in fixed (working) precision arithmetic. Numerical tests were done in MATLAB to illustrate our theoretical results. A particular emphasis is given on convergence of iterative refinement method with a relaxation. A preliminary error analysis of the Algorithm IR(ω) was given in [11]. Our opinion is opposite to that given in [11], since our experiments show that the choice ω=1 is the best choice from the point of numerical stability
Bioremediation Potential of Bacteria and Rice Husk Biochar for Cadmium and Lead in Wastewater
Get PDF Wastewater can be purified greatly when treated with biochar derived from natural rice husk. The present study provides the impact of bacteria (biofriend), commercial activated carbon, rice husk, and its biochar {pyrolysis at 300oC (RHB1), 400oC (RHB2) and 500oC (RHB3)} on synthesized and natural wastewater purification. The obtained results can be summarized as follow: RHB3 considered the best adsorbent ability for cadmium and lead in their single and mixed solutions. The presence of commercial activated carbon by the comparison it is found that it exceeds RHB3 in the case of lead. Rice husk resulted high adsorption values for cadmium and lead, but its adsorption of cadmium exceeds the lead. Addition of biofriend increase adsorption of cadmium and lead in most treatments but results still in the same trend as using rice husk or biochar only. RHB3 treatment observed its superiority and ability to purify lead and cadmium from synthesized and natural wastewater after 4 h contact time compared with other treatment under study
Association of Mesocotyl and Coleoptile Elongation with Seedling Vigor and Yield and its Components in Rice
Get PDF The present study was carried out at laboratory, greenhouse and experimental farm of Rice Research and Training Center (RRTC), Sakha, Kafr El-Sheikh, Egypt during 2014 and 2015 season to investigate the differences in some seedling vigor, yield and its attributes and Nitrogen (N) status in milled grain which measured on eight rice varieties i.e. Giza 171, Giza 177, Giza 178, Sakha 101, Sakha 102, Sakha 103, Sakha 104 and Gaori. The results revealed that the short stature genotypes Sakha101 and Gaori (91.0 and 77.95cm) gave shortest Mesocotyl length and plant height. Where as, the tall plants of Giza171, Sakha 102 (126 and 106cm) had comparatively long mesocotyl. Also, the data indicated that tall plants tend to produce long coleoptile while semi-dwarf or short genotypes produced short ones. Sakha 101 and Giza 178 rice cultivars recorded the highest values of panicles m-2, grains panicle-1, grain yield t ha-1, biomass production t ha-1 and harvest index. Nitrogen and protein content in milled grain was statistically higher in the genotype Gaori than other entries while the genotypes Sakha 101 and Sakha 103 uptake more nitrogen than the others. The results suggested that varieties of Giza177, Sakha102 and 104 are more tolerant to adverse conditions during seeding stage