Different computational technique for solution of variation issue

2021 ◽  
Vol 1 (1) ◽  
pp. 039-046
Author(s):  
Ashish Dhamanda
Keyword(s):  
Electricity Generation ◽  
The Other ◽  
Computational Technique ◽  
Comparative Result ◽  
System Parameters ◽  
Simulink Model ◽  
Comparative Results

Issue of large demand of electricity by customers in all countries becomes a big challenge to all. In this paper the issue of frequency and corresponding power in the generating station has been focused and three generating units taken as a source of electricity generation. Computational technique like; PI, PID, Fuzzy and GA Technique has been applied for the solution of such issues, when the generating unit is operating normal and also even in disturbing condition. The Simulink model has been simulated and comparative result of response has been tabulated for best effectiveness. Comparative results show that the GA techniques gives good results with respect to the other techniques by satisfying the all system parameters in all the conditions.

Computational and experimental studies of the strength of full-scale samples of pipes with defects "metal loss" and "dent with groove"

2020 ◽  
Vol 10 (3) ◽  
pp. 226-233
Author(s):  
Dmitry A. Neganov ◽  
◽  
Victor M. Varshitsky ◽  
Andrey A. Belkin ◽  
◽  
...  
Keyword(s):  
Internal Pressure ◽  
Experimental Studies ◽  
Full Scale ◽  
The Other ◽  
Metal Loss ◽  
Calculation Methods ◽  
Reliable Operation ◽  
Sufficient Stability ◽  
Comparative Results ◽  
The Moment

The article contains the comparative results of the experimental and calculated research of the strength of a pipeline with such defects as “metal loss” and “dent with groove”. Two coils with diameter of 820 mm and the thickness of 9 mm of 19G steel were used for full-scale pipe sample production. One of the coils was intentionally damaged by machining, which resulted in “metal loss” defect, the other one was dented (by press machine) and got groove mark (by chisel). The testing of pipe samples was performed by applying static internal pressure to the moment of collapse. The calculation of deterioration pressure was carried out with the use of national and foreign methodical approaches. The calculated values of collapsing pressure for the pipe with loss of metal mainly coincided with the calculation experiment results based on Russian method and ASME B31G. In case of pipe with dent and groove the calculated value of collapsing pressure demonstrated greater coincidence with Russian method and to a lesser extent with API 579/ASME FFS-1. In whole, all calculation methods demonstrate sufficient stability of results, which provides reliable operation of pipelines with defects.

Thermal Model of a Thinned-Die Cooling System

2003 ◽  
Author(s):  
N. Boiadjieva ◽  
P. Koev
Keyword(s):  
Experimental Data ◽  
Thermal Model ◽  
Cooling System ◽  
Input Power ◽  
The Other ◽  
System Parameters ◽  
Air Intake ◽  
Optical Probing ◽  
Cooling Air ◽  
Better Than

For through-silicon optical probing of microprocessors, the heat generated by devices with power over 100W must be dissipated [1]. To accommodate optical probing, a seemingly elaborate cooling system that controls the microprocessor temperature from 60 to 100° C for device power up to 150W was designed [2]. The system parameters to achieve the desired thermal debug environment were cooling air temperature and air flow. A mathematical model was developed to determine both device temperature and input power. The 3-D heat equation that governs the temperature distribution was simplified to a case of a 1-D rod with one end at the device center and the other at the cooling air intake. Thus the cooling system was reduced to an analytical expression. From experimental data, we computed all coefficients in the model, then ran extensive tests to verify—the accuracy was better than 10% over the entire temperature and power ranges.

Picture-Based e-Learning of English Phrasal Verbs: A Comparative Study of the Use of Pictures and L1 Glosses

2013 ◽  
Vol 7 (supplement) ◽  
pp. 222-233 ◽  
Author(s):  
Yumiko Oe ◽  
Yukiko Sasaki Alam
Keyword(s):  
Comparative Study ◽  
Web Application ◽  
Strong Influence ◽  
Native Speakers ◽  
The Other ◽  
Phrasal Verbs ◽  
Native Languages ◽  
Japanese Word ◽  
E Learning ◽  
Comparative Results

English phrasal verbs such as ‘call off’ (a game due to rain) and (the buttons) ‘come off’ are difficult for non-native speakers to learn because the meanings of many phrasal verbs are not compositions of the meanings of each component. It was reported that the use of phrasal verbs was avoided by non-native speakers and that the mastery of collocations was hampered by a strong influence from the learner's native language. Therefore, to prevent such interference from learners’ native languages, it would be appropriate to learn phrasal verbs directly through nonverbal media such as pictures and sound. A web application was developed for the picture-based e-learning of phrasal verbs. An experiment was conducted, which consisted of a sequence of two sessions with a week-long break in between. In order to investigate the learning effectiveness, two methods were compared: one with the display of meaning with still pictures, and the other with Japanese word glosses. Two groups participated in the experiment, and each group had both methods. The only difference was the sequence of the order of the two methods. This paper reports the comparative results of the two post-tests by the two groups, discusses some of the findings, and offers several suggestions.

scholarly journals Cenários para a matriz de geração de eletricidade do Ceará em 2050

2020 ◽  
Vol 42 ◽  
pp. e63
Author(s):  
Breno Bezerra Freitas ◽  
Clayton Ferreira Teles ◽  
Davi Ribeiro Lins ◽  
David Mickely Jaramillo Loayza ◽  
Dayane Cristina Lima Ramalho ◽  
...  
Keyword(s):  
Electricity Generation ◽  
Wind Farms ◽  
The State ◽  
The Other ◽  
Energy Matrix ◽  
Photovoltaic Generation ◽  
Renewable Sources ◽  
Urban Solid Waste ◽  
Similar Growth ◽  
Transition Scenario

Based on the worldwide proposition of energy matrix scenarios for 2050, the objective of this article is to present scenarios of electricity generation for Ceará in 2050, showing the participation of sources already used in the state's electric matrix and adding new ones. The article proposes three scenarios: a conservative one, where the present proportion of electricity generation sources of the state is maintained, a transitional one, with 50% of electricity generation from non-renewable sources and the other 50% from renewable sources, and 100% renewable, without the use of fossil or nuclear fuels. Estimates for 2050 in the state are obtained by extrapolating generation data from 2011 to 2017, reaching an estimated 94,775 GWh. In the conservative scenario, it is observed that half of this generation is made by thermoelectric plants and the other half by wind farms. In the transition scenario, dominated by the use of natural gas, the exponential growth of photovoltaic generation stands out. In the 100% renewable scenario, dominated by wind farms, in addition to the similar growth of photovoltaic generation as in the transition scenario, we highlight the use of urban solid waste and solar thermal concentration plants.

scholarly journals A Novel Elastic Metamaterial with Multiple Resonators for Vibration Suppression

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Saman Ahmadi Nooraldinvand ◽  
Hamid M. Sedighi ◽  
Amin Yaghootian
Keyword(s):  
Vibration Suppression ◽  
Equations Of Motion ◽  
Small Mass ◽  
The Other ◽  
Governing Equations ◽  
System Parameters ◽  
Rectangular Frame ◽  
Adams Software ◽  
Linear Spring ◽  
Base Structure

In this paper, two models of elastic metamaterial containing one and two resonators are proposed to obtain the bandgaps with the aim of providing broadband vibration suppression. The model with one DOF is built by assembling several unite cells in which each unite cell consists of a rectangular frame as the base structure and a rack-and-pinion mechanism that is joined to the frame with a linear spring on both sides. In the second model with two DOF, a small mass is added while its center is attached to the center of the pinion on one side and the other side is connected to the rectangular frame via a linear spring. In the first mechanism, the pinion is considered as the single resonator, and in the 2DOF model, on the other hand, the pinion and small mass acted as multiple resonators. By obtaining the governing equations of motion for a single cell in each model, the dynamic behavior of two metastructures is thoroughly investigated. Therefore, the equations of motion for the two models are written in matrix form, and then, the dispersion relations are presented to analyze the influences of system parameters on the bandgaps’ starting/ending frequencies. Finally, two models are successfully compared and then numerically simulated via MATLAB-SIMULINK and MSC-ADAMS software. With the aid of closed-form expressions for starting/ending frequencies, the correlation between the system parameters and bandgap intervals can be readily recognized.

The Case Study on Optimization of Large Scale Heating and Cooling Network

2014 ◽  
Vol 525 ◽  
pp. 611-615
Author(s):  
Lan Bin Liu ◽  
Ai Juan Zou ◽  
Jia Jun Liao ◽  
Yu Fei Ma
Keyword(s):  
Temperature Difference ◽  
Large Scale ◽  
Cooling System ◽  
The Other ◽  
Water Load ◽  
System Parameters ◽  
Heating And Cooling ◽  
Return Water ◽  
Load Center

This paper discussed the optimization of two cases of large scale heating and cooling system. One is the heating/cooling system with heating/cooling source with distance from load center, the other is the heating/cooling system with heating/cooling source located in the load center. The affect of the temperature difference between supply and return water, load density and the price of energy towards optimized radius and max radius was discussed using the existed model. The optimized radius and appropriate system parameters are got. It is a reference to the designers and operators related.

Reliability and Physics Failure of Stretchable Organic Solar Cells

MRS Advances ◽  
2016 ◽  
Vol 1 (1) ◽  
pp. 21-26 ◽  
Author(s):  
O. K. Oyewole ◽  
D. O. Oyewole ◽  
M. G. Zebaze Kana ◽  
W. O. Soboyejo
Keyword(s):  
Organic Solar Cells ◽  
Electricity Generation ◽  
Interfacial Adhesion ◽  
Bulk Heterojunction ◽  
Service Condition ◽  
Charge Carriers ◽  
Computational Technique ◽  
Service Conditions ◽  
Low Performance ◽  
Silicon Based

ABSTRACTOrganic solar (OPV) cells are cheap electronics that can replace the widely used high cost silicon-based electronics for electricity generation. They are cheap because of the easy techniques involved in their fabrication processes and they can be produced to cover a large surface area. However, the current low performance of organic electronics has been traced to failure due to interfacial adhesion problems, material processes, and service conditions. Therefore, transportation of charge carriers across the bulk heterojunction system of OPV cells becomes very difficult in the presence of these flaws. In this paper a combined experimental and computational technique is used to study the reliability and physics failure of stretchable OPV cells. Interfacial adhesion energies in the layered structures of OPV cells are measured and compared with theoretical estimated energies. The limit stresses/strains applied on layered OPV cells during service condition are estimated using critical values of the measured interfacial adhesion. The results obtained are, therefore, explained to improve the design of reliable OPV cells.

scholarly journals Application of data-intelligence algorithms for modeling the compaction performance of new pharmaceutical excipients

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Garba M. Khalid ◽  
Abdullahi G. Usman
Keyword(s):  
Linear Models ◽  
Fuzzy Inference ◽  
Compaction Pressure ◽  
The Other ◽  
Inference System ◽  
Performance Skills ◽  
Pharmaceutical Excipients ◽  
Modified Starches ◽  
Pregelatinized Starch ◽  
Comparative Results

Abstract Background Pharmaceutical excipient development is an extensive process requiring a series of pre-formulation studies to evaluate their performance. The present study compares the conventional compaction and compression pre-formulation studies with artificial intelligence (AI) modeling to predict the performances of thermally and chemically modified starches obtained from Livingstone potato. Results The native starch was modified by three methods, and we obtained the following starches; pregelatinized starch (PS), ethanol dehydrated pregelatinized starch (ES), and acid hydrolyzed starch (AS). Microcrystalline cellulose (Avicel® PH101) was employed as a reference since its use in tablet direct compression has been established. The role of compaction pressure on the degree of volume reduction of the tablets was studied using Kawakita and Heckel models which highlighted that when the starch is modified by pregelatinization followed by ethanol dehydration, and/and or acid hydrolysis modification, a directly compressible starch can be obtained that can plastically deform. The data-intelligence results indicated the reliability of the AI-based models over the linear models. Hence, the comparative results demonstrated that the Adaptive neuro-fuzzy inference system (ANFIS) outperformed the other two models in modeling the performance of all of the four excipients with considerable performance accuracy. Conclusion The compressibility indices have shown matching characteristics of AS and ES to Avicel® PH101 in terms of direct compressibility potential than PS. Moreover, the data intelligence modeling demonstrates the reliability and satisfactory of ANFIS as a hybrid model over the other two models with increased performance skills in modeling the compaction properties of these novel pharmaceutical excipients.

Properties of dual parabolic cylindrical reflectors

1985 ◽  
Vol 63 (10) ◽  
pp. 1299-1305 ◽  
Author(s):  
M. S. A. Sanad ◽  
L. Shafai
Keyword(s):  
Point Source ◽  
Optical System ◽  
Integration Method ◽  
The Other ◽  
Main Beam ◽  
Far Field ◽  
Beam Direction ◽  
System Parameters ◽  
Focal Line ◽  
Field Patterns

Two parabolic cylinders having the focal line of one coincident with the directrix of the other form an optical system that focuses the focal line of the first reflector to a point at infinity. The operation principle of such a system is studied, and its far diffracted field is determined. The unit is assumed to be illuminated by a directional point source, simulating a feed horn, and a ray-tracing approach is used to obtain the reflected and main diffracted fields over its aperture. The far-field patterns in the vicinity of the main beam direction are then computed by an aperture-integration method. The effects of various system parameters, on the far-field patterns, are also determined.

Thermal Model of a Thinned-Die Cooling System

2004 ◽  
Vol 126 (4) ◽  
pp. 435-439 ◽  
Author(s):  
N. Boiadjieva ◽  
P. Koev
Keyword(s):  
Experimental Data ◽  
Thermal Model ◽  
Cooling System ◽  
Input Power ◽  
The Other ◽  
System Parameters ◽  
Air Intake ◽  
Optical Probing ◽  
Cooling Air ◽  
Better Than

For through-silicon optical probing of microprocessors, the heat generated by devices with power over 100W must be dissipated 1. To accommodate optical probing, a seemingly elaborate cooling system that controls the microprocessor temperature from 60 to 100°C for device power up to 150 W was designed 2. The system parameters to achieve the desired thermal debug environment were cooling air temperature and air flow. A mathematical model was developed to determine both device temperature and input power. The 3D heat equation that governs the temperature distribution was simplified to a case of a 1D rod with one end at the device center and the other at the cooling air intake. Thus the cooling system was reduced to an analytical expression. From experimental data, we computed all coefficients in the model, then ran extensive tests to verify—the accuracy was better than 10% over the entire temperature and power ranges.

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