Action space noise optimization as exploration in deterministic policy gradient for locomotion tasks

Applied Intelligence - Reinforcement learning (RL) algorithms with deterministic actors (policy) commonly apply noise to the action space for exploration. These exploration methods are either...     

On Computer Implementation for Comparison of Inverse Numerical Schemes for Non-Linear Equations

In this research article, we interrogate two new modifications in inverse Weierstrass iterative method for estimating all roots of non-linear equation simultaneously. These modifications enables us to accelerate the convergence order of inverse Weierstrass method from 2 to 3. Convergence analysis proves that the orders of convergence of the two newly constructed inverse methods are 3. Using computer algebra system Mathematica, we find the lower bound of the convergence order and verify it theoretically. Dynamical planes of the inverse simultaneous methods and classical iterative methods are generated using MATLAB (R2011b), to present the global convergence properties of inverse simultaneous iterative methods as compared to classical methods. Some non-linear models are taken from Physics, Chemistry and engineering to demonstrate the performance and efficiency of the newly constructed methods. Computational CPU time, and residual graphs of the methods are provided to present the dominance behavior of our newly constructed methods as compared to existing inverse and classical simultaneous iterative methods in the literature.     

Optical and physical behaviours of newly developed germanium-tellurium (GeTe) glasses: a comprehensive experimental and in-silico study with commercial glasses and ordinary shields

Journal of Materials Science: Materials in Electronics - In this study, synthesis and determination of physical, optical, and radiation shielding properties of glasses based on TeO2 and GeO2 were...     

Conceptual Hybrid Model for Wearable Cardiac Monitoring System

Wireless Personal Communications - The electrocardiogram is the most convenient and widely used method of cardiac monitoring. The information provided by an ECG, has the potential to be used as a...     

Performance of multiple effect diffusion stills

Experimental testing of a three-effect diffusion still is carried out. The experiment is designed to test the effect of the heating fluid temperature input to the still T_h and the feed rate of desalinated water to the still F on the performance of the still. The results produced several empirical relations to predict the following in terms of the T_h and F: the average temperature of each effect, the rate of distillate produced by each effect, and the performance ratio of the still. In addition, a mathematical simulation is given for the n-effect diffusion still. The mathematical model is verified by comparing its results with the experimental results of the three-effect diffusion still. The model is further used to predict the performance of a ten-effect diffusion still at the following parametric conditions: various values of the dimensionless parameters N₃ and N₄, various heating medium temperatures input to the still, and various feed rates to the still.     

Effect of cold work on anodic polarization of low carbon steel

Carbon steel nails prepared by deep drawing exhibit grains elongated in the direction of swaging. They are also characterized by high corrosion rates, as measured potentiodynamically in 0.1 M H₂SO₄. Normalization of grain dimensions and reduction in the corrosion rate are achieved through annealing. Treatment at 750? C for 2 h is effective in producing strain-free specimens with rounded grains. Extended heat treatment at this temperature causes the development of larger grains and the improvement in the corrosion behaviour of the alloy. “As-received” and strain-free specimens are subjected to controlled tensile or torsional cold work. In all cases deformation results in an increase in the susceptibility of the alloy to undergo attack. The rate of corrosion increases greatly when the deformed steel corrodes in Cl^? ion containing media. Both general and pitting corrosion are operative.     

A large-area mesoporous array of magnetic nanostructure with perpendicular anisotropy integrated on Si wafers

Large-area, over several square centimeters, mesoporous array of magnetic nanostructure with perpendicular anisotropy is prepared by depositing Co/Pt multilayers (MLs) on a mesopore array of anodized alumina (AAO) fabricated on Si wafers. The MLs are mainly deposited on the top of AAO walls and perimeters of the pores; very small amounts of magnetic material reach the bottom due to the high aspect ratio of AAO. Consequently, ordered pores are present in the magnetic MLs. The mean pore diameter of the fabricated mesoporous array is 8.83?nm with a standard deviation of 3.16?nm and density of about 2.1 × 10(11)?cm(-2). The Co/Pt MLs deposited on AAO and Si both exhibit strong perpendicular magnetic anisotropy, but the perpendicular coercivity (H(c)) increases by 15 times on AAO compared to that on Si. On the other hand, the magnetic cluster size decreases from 1000?nm (on Si) to 100?nm due to the presence of high-density pores. The dramatic increase in H(c) and the decrease in magnetic cluster size suggest that the pores behave as effective pinning sites. The magnetization-switching characteristics of the fabricated porous structure are different from those of the continuous films or Stoner-Wohlfarth-type (S-W) particles. One of the potential applications of this mesoporous structure may be in the field of high-density magnetic data storage.     

Nonlinear aeroelastic response of slender wings based on Wagner function

This paper presents a method for nonlinear aeroelastic analysis of Human Powered Aircraft (HPA) wings. In this type of aircraft there is a long, highly flexible wing. Wing flexibility, coupled with long wing span can lead to large deflections during normal flight operation; therefore, a wing in vertical and torsional motion using the second-order form of nonlinear general flexible Euler–Bernoulli beam equations is used for structural modeling. Unsteady linear aerodynamic theory based on Wagner function is used for determination of aerodynamic loading on the wing. Combining these two types of formulations yields the nonlinear integro-differentials aeroelastic equations. Using the Galerkin's method and modes summation technique, the governing equations will be solved by introducing an iterative numerical method to predict the aeroelastic response of the problem. The obtained results for a test case are compared with those of linear study which shows good agreement for speeds less than the flutter speed, but the nonlinear model shows limit cycle oscillations for the wing beyond the flutter boundary.     

基于Wagner函数的细长机冀非线性空气弹性反应分析

介绍了人力飞机机翼的非线性空气弹性分析方法。这种飞机具有长而且高度弹性的机翼。弹性机翼和较长的机翼跨度会在正常飞行中导致机翼的大变形。因此,在机翼的竖向和扭转运动中采用二阶非线性弹性Euler-Bernoulli梁函数进行结构建模。采用基于Wagner函数的不稳定线性空气动力学理论确定机翼的空气动力荷载。将这两种公式结合起来就产生了非线性积分一微分空气弹性函数。采用Galerkin方法和模式求和方法,通过在空间弹性反应分析中引入一个迭代数值方法来求解控制方程。将分析结果与线性分析结果对比,发现在低于颤振速率的速度下,两者能很好地吻合,但是非线性模型显示出机翼的极限周期振幅超出了边界值。     

Prediction of emission spectra of fluorescence materials using principal component analysis

Fluorescent materials are now a critical field of research due to their unique excitation and emission properties that can be tailored to specific fluorescence detection technologies. In this work, a procedure is described to approximate the emission spectral data of fluorescent materials of different types from their excitation spectral data using principal component analysis (PCA) technique. First, PCA as a statistical and mathematical method was used to reconstruct the excitation and emission spectra of training dataset and then, the approximation was accomplished by multiple linear regression (MLR).The performance of obtained function was examined on testing dataset. Afterward, CIE tristimulus values of the fluorescent samples were calculated based on ASTM, E2152–12 standard test method. The colorimetric accuracy was then evaluated by calculating the geometric differences in CIE tristimulus values X, Y, and Z for the 1964 standard colorimetric observer under illuminant D65. The obtained results show a good curve fit between the actual emission spectra and recovered emission spectra. In addition, based on cumulative variance and root mean square (RMS), eight principal components were selected as optimum number of principal components for prediction of emission spectra data. © 2015 Wiley Periodicals, Inc. Col Res Appl, 41, 16–21, 2016