فهرست مطالب

نشریه نخبگان علوم و مهندسی
سال ششم شماره 1 (فروردین 1400)

تاریخ انتشار: 1400/02/18
تعداد عناوین: 12

فارسی
English

انتخاب همه

Take a Critical Look at for Commitment or Expertise in From the Perspective of Islamic Criminology and Criminal Sociology

Seyed Mohammad Reza Mousavifard* Pages 1-18

One of the controversial issues that has been considered for a long time is this issue. In the choices that are made, at least in the contemporary period after the Islamic Revolution, the question is whether the principle of commitment should be the criterion or the principle of expertise should be the desired choice. By examining different perspectives that are often debatable in two intellectual spectrums; some believe in commitment from an ideological and revolutionary point of view, believing that specialization also follows (expediency perspective). Others argue against specialization; Most of these people are best known for their typologically atheistic views. In this article, we try to find an intermediate approach based on interdisciplinary teachings (a new answer based on the teachings of Islamic criminology, etc.) for this theoretical and at the same time practical conflict and give a realistic answer based on facts.

Keywords: Commitment, Expertise, Administrative selection, Corruption, Islamic criminology, Crime, Violation

Abstract View Paper Research/Original Article Original: Persian
Effect Adding Silver on Electrical and Magnetic Properties of Copper Oxide Thin Film

Hasan Anousha* Pages 117-123

In this study, CuO-Ag thin film are deposited on the glass substrate using a plasma focus device and sputter system. The obtained results based on the electrical and magnetic properties are discussed. The diagram I-V shows that the current changes in voltage follow the Ohm's law almost. By 4probe method, deposition of silver nanoparticles on copper oxide film results in decrease sheet resistance. According to the analysis VSM, the penetration of silver nanoparticles on the surface copper oxide leads to a linear increase in the magnetization of sample.

Keywords: CuO-Ag, Plasma Focus, Sputtering, I-V, VSM

Abstract View Paper Research/Original Article Original: English
Investigating the Effect of Different Noise Reduction Filters on the Rate of Penetration Approximation by Machine Learning Based Models

Ehsan Brenjkar* Pages 138-160

Accurate modeling and estimation of drilling rate of penetration (ROP) is a prelude to better planning to reduce drilling time and control costs. However, estimating this key factor is not easy and the main reason is the complex relationship between penetration rate and drilling variables. On the other hand, the presence of noise in the data increases the training time of the models and drastically reduces their accuracy. In this study, the multilayer perceptron neural network (MLP) method and the least squares support vector regression (LSSVR) method along with four data noise reduction filters have been used to estimate the penetration rate. The data used in order to feed the models, collected from mud logging unit (MLU) and final report of a drilled well that located in south-west Iran. After the feature selection process with simulated annealing (SA) optimization algorithm and artificial neural networks, eleven variables were selected from all of the variables. Out-of-range points were then removed and the overall noise of the data was reduced by median filter, savitzky-golay, moving average and signal wavelet. Finally, the performance of the developed models and filters used were evaluated and compared by different statistical indicators and it was proved that the LSSVR method with radial basis kernel and output data from moving average filter shows the best results in the both training and testing section of the model

Keywords: Drilling rate of penetration, Multilayer perceptron neural network, Least square support vectorregression, Feature selection, Noise reduction, Simulated annealing algorithm

Abstract View Paper Research/Original Article Original: Persian
Investigation and Review on Effective Thermal Factors in Reducing the Life of Transformer

Ali Hasani Azad, Gholamreza Tathiri, Vahid Monfared* Pages 172-183

Distribution transformers are designed to operate in an oil temperature range named the allowable range. This range depends on various factors such as the insulation class of the coils, the cooling fluid, the cooling method and the environmental conditions. If a transformer operates at a low temperature, its insulation life will increase. Based on this fact, it can be said that temperature is an important factor in transformer optimization. One of the major problems of the power distribution network is the overheating of the distribution transformers during the summer that resulted to failure and damage of that. Increasing the load due to the use of cooling devices and solar radiation on the transformers causes them to heat up and helps to increase its temperature. The normal life of transformer insulation is 85,000 hours, which is equivalent to 10 years for Class A insulation. This life is halved or doubled for every 8 degrees of rise or fall of the specified value. Hot spot temperature is one of the important and key parameters in determining the insulation life of the transformer. The hot spot temperature of the transformer depends on the ambient temperature, high oil temperature and coil temperature. Also, the temperature of the hot point of the coil is a function of wind speed, thermal radiation of the sun and the height of the transformer installation relative to the sea level. In the present article, the effect of oil type, solar radiation, color and external environmental factors on the heating of distribution motors is reviewed and investigated experimentally and analytically.

Keywords: Transformer, Thermal factors, Life time, Oil type, Solar radiation, Color, externalenvironmental factors

Abstract View Paper Research/Original Article Original: Persian

نشریه نخبگان علوم و مهندسی

Journal of Science and Engineering Elites

دوماهنامه حوزه علوم پایه و فنی و مهندسی - صنعت و علوم فناوری های نوین به زبان فارسی و انگلیسی

آخرین شماره | آرشیو

ISSN: 2538-581x

صاحب امتیاز:

گروه نخبگان دانشگاهی ایران

مدیر مسئول:

آذین موحدی

سردبیر:

دکتر سیامک حاجی یخچالی

تلفن نشریه: ۰۲۱-۴۴۲۵۸۱۹۷

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فهرست مطالب

نشریه نخبگان علوم و مهندسی سال ششم شماره 1 (فروردین 1400)

نشریه نخبگان علوم و مهندسی

Journal of Science and Engineering Elites

نشریه نخبگان علوم و مهندسی
سال ششم شماره 1 (فروردین 1400)