Acid rain and environmental problems
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 14th سپتامبر 2016
- بدون نظر
Acid rain and environmental problems
Acid rain is an outcome of air pollution which was first discovered in 1581. Acid rain formation is due to the atmospheric discharge of sulfur and nitrogen oxides which are mainly the outcome of burning the fossil fuels. Acid rain can cause environmental disruptions like; damaging the forests, lakes, groundwater, and soils. The damage caused by acid rain depends on the level of acid deposition and the natural sensitivity of soils and water bodies. There are set of solutions suggested which some are used for prevention of acid rain (such as international protocols issued to reduce emissions and using alternative ways to produce energy) and others for recovery of affected areas (such as liming process used to neutralize acidic lakes and streams)….
Biopestisides: Introduction, Advantages and Opportunities
- takbook
- کشاورزی و منابع طبیعی
- 14th سپتامبر 2016
- بدون نظر
Biopestisides: Introduction, Advantages and Opportunities
The green revolution technology characterized by the use of high yielding varieties, chemical fertilizer, pesticides and water has resulted in a phenomenal growth in agriculture productivity. While the gains have been very impressive, the input intense agriculture has resulted in some undesirable effects on the environment and the overall sustainability of the farming systems. Agriculture and forests form an important resource to sustain global economic, environmental and social system. For this cause, the global challenge is to secure high and quality yields and to make agricultural produce environmentally compatible. Convectional pesticides have been utilized for decades to protect stored grain from pests, but their harmful environmental impact and pest resistance resulting from the…
Best Accuracy Of Data Assimilation In State-Space Using quadrature Ensemble Square Root Filter
in this article, we will describe Quadrature Ensemble Square Root Filter (qEnSRF). The qEnSRF is combined of Quadrature Ensemble Kalman Filter (qEnKF) and Ensemble Square Root Filter (EnSRF). For estimateing and predicting of data in econometric models and in state-space we are going to use Ensemble Kalman Filter. Ensemble Kalman Filter (EnKF) is a method based on assimilation data sequence which is used in a wide range. Then by introducing of the error of Quadrature Ensemble Square Root Filter (qEnSRF) we observe that the error of sampling is reduced significantly….
Comparison of Energy Levels of F Isotope(91) using OXBASH Shell Model Code with Experimental Results
Comparison of Energy Levels of F Isotope(91) using OXBASH Shell Model Code with Experimental Results
In this work by using OXBASH shell model code is calculated of energy levels of F isotopes. This code which is based on one of the most applicable nuclear models, deals with evaluating energy levels. Meanwhile, the ground state of excitation energy evaluated by OXBASH code together with energy levels and also probable places for nucleons’ placements in each energy level. Programs will be reliable only when results meet experimental procedures.Key Words:Energy Levels-Shell Model-OXBASH Code- F IsotopesPACS No:Nuclear Physics…
Convergence Rate of GMRES on Tridiagonal Toeplitz Linear System
This paper aimed to review paper [01] titled “The rate of convergence of GMRES on a tridiagonaltoeplitz linear system II” by Ren-cang Li & Wei Zhang and its references, in which linear systemAx=b is solved using Toeplitz matrices by generalized minimal residual method. Based on this thesis,this method is the best and most complete way to solve asymmetric matrices. Since the analysis of theconvergence of such systems is difficult and complex, 2nd order orthogonal Chebyshev polynomialshave been used to obtain more accurate limits and expressions for residual. In this thesis, convergencerate of GMRES was increased for linear toepltiz matrices using certain formulas. Simpler and fasterbounds will be provided for linear system of Ax=b while all entries of A except for first and…
Controlling Epilepsy With a Brain Implant
In this essay you are going to read about a smarter technology reduces seizures in epileptic patients by identifying dangerous patterns of brain activity. Also the neurostimulator is a small, battery powered device surgically implanted in the skull. Physicians trained on use of the RNS System program the neurostimulator to continuously monitor brain electrical activity, and the neurostimulator delivers brief pulses of stimulation when it detects activity that could lead to a seizure. The stimulation can help to prevent the seizure before it happens. The leads are wires that connect the neurostimulator directly to the area of the brain where seizures start. The neurostimulator uses the leads to sense brain activity and to deliver brief pulses of stimulation….
Convergence Rate of GMRES on Tridiagonal Toeplitz Linear System
This paper aimed to review paper [10] titled “The rate of convergence of GMRES on a tridiagonal toeplitz linearsystem II” by Ren-cang Li & Wei Zhang and its references, in which linear system Ax=b is solved using Toeplitzmatrices by generalized minimal residual method. Based on this thesis, this method is the best and most completeway to solve asymmetric matrices. Since the analysis of the convergence of such systems is difficult and complex,2nd order orthogonal Chebyshev polynomials have been used to obtain more accurate limits and expressions forresidual. In this thesis, convergence rate of GMRES was increased for linear toepltiz matrices using certainformulas. Simpler and faster bounds will be provided for linear system of Ax=b while all entries of A except for firstand…
Comparison of PIM and the Variational Iteration Methods (VIM) for Solving Linear Optimal Control Problems
This article presents the Parametric Iteration Method (PIM) for finding optimal control and its corresponding trajectory of linear systems. Without any discretization or transformation, PIM provides a sequence of functions which converges to the exact solution of problem. Our emphasis will be on an auxiliary parameter which directly affects on the rate of convergence. Comparison of PIM and the Variational Iteration Method (VIM) is given to show the preference of PIM over VIM. Numerical results are given for several test examples to demonstrate the applicability and efficiency of the method….
Development of a UV- HPLC method for assay and dissolution in Dapoxetine
The aim of this work was to develop and validate of assay and dissolution tests for Dapoxetine Hydrochloride in the pharmaceutical dosage by using HPLC and spectrophotometric analyses, respectively. The assay method by HPLC was found to be linear in the concentration range of 05 to 105 μg/ml. All the parameters of validation were in the acceptance range. This developed method was successfully applied to estimate the amount of Dapoxetine Hydrochloride in the tablets. Moreover, a simple and precise UV spectrophotometric technique was used for the determination in dissolution studies. Linear dependency of UV spectrophotometric method lies in the concentration range of 15 to 05 μg/ml. This proposed methods was sensitive, accurate, repeatable and useful for the routine determination of…
Design and Fabricate the High Performance Tuneable LWIR Wavelengths Emitter Cell
This paper, introduces a new thermal cell which can emit infrared wavelengths from its surface and it is tuneable and suitable for using in thermal screen. The cell can produce the temperatures between 0and 100ºC that emit an infrared radiation in the LWIR (8-11 micrometers) region. The cell components made of nanocomposite material and it is shown that the features of the cell %00-00 are higher than the commercial Bi1Te0 component. The technical aspect of the cell such as the emission wavelengths, rate of temperature changing, thermal contrast, ZT factor and so one discussed in this paper and were determined by using the thermography, non-contact thermometry, radiometry, four probe ac method and temperature differential….