503 research outputs found
The development of the Weberian apparatus and the swim bladder in channel catfish, Ictalurus punctuatus (rafineque) /
Planning of Sustainable Industrial Zones and Means of Achieving them in Iraq
The development of industrial activity in cities and regions is one of the most distinctive features of postmodern urban planning. The industry in all its branches is considered one of the most important economic activities in cities, which is the main engine of economic life and the driving force of development at all levels. This development has been accompanied by the negative effects of this economic activity on ecosystems and on human life in its various aspects, namely, environmental pollution in various ways, depletion of renewable and depleted natural resources, and the serious consequences of climate change, environmental degradation and Collapse. Hence the need to find solutions that allow the continuation of industries because of the importance of human life and to overcome the problems resulting from them and reduce them as much as possible The emergence of the concept of sustainability as a solution to this problem. This paper discusses the theme of sustainable industry, sustainable industrial zone planning, global experiences and identification of deliberatestrategies for sustainability, As well as trends in Iraq towards the establishment of green industrial cities, And their analysis and knowledge of their shortcomings in comparison to international experiences. And recommend some policies to achieve sustainability
GENETIC ALGORITHM-PID CONTROLLER FOR MODEL ORDER REDUCTION PANTOGRAPHCATENARY SYSTEM
Controlling the contact force between the pantograph and the catenary has come to be a requirement for improving the performances and affectivity of high-speed train systems Indeed, these performances can also significantly be decreased due to the fact of the catenary equal stiffness variation. In addition, the contact force can also additionally differ and ought to end up null, which may additionally purpose the loss of contact. Then, in this paper, we current an active manipulate of the minimize order model of pantograph-catenary system .The proposed manipulate approach implements an optimization technique, like particle swarm (PSO), the usage of a frequent approximation of the catenary equal stiffness. All the synthesis steps of the manipulate law are given and a formal evaluation of the closed loop stability indicates an asymptotic monitoring of a nominal steady contact force. Then, the usage of Genetic Algorithm with Proportional-Integral-derivative (G.A-PID) as proposed controller appeared optimum response where, the contacts force consequences to be virtually equal to its steady reference. Finally it seems the advantageous of suggestion approach in contrast with classical manipulate strategies like, Internal mode control(IMC) method, linear quadratic regulator (LQR).The outcomes via the use of MATLAB simulation, suggests (G.A-PID) offers better transient specifications in contrast with classical manipulate
PERFORMANCE ANALYSIS AND EVALUATION OF MASSIVE MIMO SYSTEM
This article examines the performance of massive MIMO uplink system over Rician fading channel. The performance is estimated regarding spectral efficiency versus number of base station antennas utilizing three plans of linear detection, maximum-ratio-combining (MRC), zero forcing receiver (ZF), and minimum mean-square error receiver (MMSE). The simulation results reveal that the spectral efficiency increments altogether with expanding the quantity of base station antennas. Additionally, the spectral efficiency with MMSE is superior to that with ZF, and the last is superior to that with MRC. Furthermore, the spectral efficiency diminishes with expanding the fading parameter
Local Power For Combining Independent Tests in The Presence of Nuisance Parameters For The Logistic Distribution
Four combination methods of independent tests for testing a simple hypothesis versus one-sided alternative are considered viz. Fisher, the logistic, the sum of P-values and the inverse normal method in case of logistic distribution. These methods are compared via local power in the presence of nuisance parameters for some values of α using simple random sample
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