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国外建筑科学 1991年第2期6卷 10-18页

作者： kordi.,k 郭先瑚

Rice Husk at a Glance:From Agro-Industrial to Modern Applications

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Rice science 2024年第1期31卷 14-32页

作者： Masoumeh kordi.Naser FARROkHI Martin I.PECH-CANUL Asadollah AHMADIkHAH Department of Cell&Molecular Biology Faculty of Life Sciences and BiotechnologyShahid Beheshti UniversityTehran ***Iran 1062 Metallurgical Industry Avenue Industrial Park Saltillo-Ramos ArizpeRamos ArizpeCoahuila 25900Mexico

Excessive waste production has led to the concept of a circular bioeconomy to deliver valuable by-products and improve environmental *** annual worldwide rice production accounts for more than 750 million tons of grain and 150 million tons of *** husk(RH)contains valuable biomaterials with extensive applications in various *** proportions of each component depend primarily on rice genotype,soil chemistry,and climatic *** and its derivatives,including ash,biochar,hydrochar,and activated carbon have been placed foreground of applications in agriculture and other *** the investigation on RH’s compositions,microstructures,and by-products has been done copiously,owing to its unique features,it is still an open-ended area with enormous scope for innovation,research,and ***,we reviewed the latest applications of RH and its derivatives,including fuel and other energy resources,construction materials,pharmacy,medicine,and nanobiotechnology to keep this versatile biomaterial in the spotlight.

关键词： circular bioeconomy rice husk activated carbon rice husk ash rice husk biochar rice husk hydrochar rice husk application

Survey of Indoor Localization Based on Deep Learning

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Computers, Materials & Continua 2024年第5期79卷 3261-3298页

作者： khaldon Azzam kordi.Mardeni Roslee Mohamad Yusoff Alias Abdulraqeb Alhammadi Athar Waseem Anwar Faizd Osman Centre for Wireless Technology Faculty of EngineeringMultimedia UniversityCyberjaya63100Malaysia Communication Systems&Networks Research Lab Malaysia-Japan International Institute of TechnologyUniversiti Teknologi MalaysiaKuala Lumpur54100Malaysia Department of Electrical Engineering(DEE) International Islamic UniversityIslamabad44000Pakistan Rohde&Schwarz(M)Sdn Bhd Shah Alam40150Malaysia

This study comprehensively examines the current state of deep learning (DL) usage in indoor *** emphasizes the significance and efficiency of convolutional neural networks (CNNs) and recurrent neuralnetworks (RNNs). Unlike prior studies focused on single sensor modalities like Wi-Fi or Bluetooth, this researchexplores the integration of multiple sensor modalities (e.g.,Wi-Fi, Bluetooth, Ultra-Wideband, ZigBee) to expandindoor localization methods, particularly in obstructed environments. It addresses the challenge of precise objectlocalization, introducing a novel hybrid DL approach using received signal information (RSI), Received SignalStrength (RSS), and Channel State Information (CSI) data to enhance accuracy and stability. Moreover, thestudy introduces a device-free indoor localization algorithm, offering a significant advancement with potentialobject or individual tracking applications. It recognizes the increasing importance of indoor positioning forlocation-based services. It anticipates future developments while acknowledging challenges such as multipathinterference, noise, data standardization, and scarcity of labeled data. This research contributes significantly toindoor localization technology, offering adaptability, device independence, and multifaceted DL-based solutionsfor real-world challenges and future advancements. Thus, the proposed work addresses challenges in objectlocalization precision and introduces a novel hybrid deep learning approach, contributing to advancing *** deep learning-based indoor localization techniques have improved accuracy, challenges likedata noise, standardization, and availability of training data persist. However, ongoing developments are expectedto enhance indoor positioning systems to meet real-world demands.

关键词： Deep learning indoor localization wireless-based localization

Towards automated statistical partial discharge source classification using pattern recognition techniques

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High Voltage 2018年第3期3卷 162-169页

作者： Hamed Janani Behzad kordi Department of Electrical and Computer Engineering University of Manitoba75A Chancellor's CircleWinnipegMBCanadaR3T5V6 Powertech Labs Inc. 12388-88 AvenueSurreyBCCanadaV3W 7R7

This study presents a comprehensive review of the automated classification in partial discharge(PD)source identification and probabilistic interpretation of the classification results based on the relationship between the variation of the phase-resolved PD(PRPD)patterns and the source of the *** proposed automated classification system consists of modern,high-performance statistical feature extraction methods and classifier *** application in online monitoring and recognition of the PD patterns is investigated based on their low-processing time and high-performance *** application of modern statistical algorithms and pre-processing methods configured in this automated classification system improves the pattern recognition accuracy of the different PD sources that are suitable to be employed in different high-voltage(HV)insulation *** evaluate the performance of the different combinations of the feature extraction/classier pairs,laboratory setups are designed and built that simulate various types of *** test cells include three sources of PD in SF6,two sources of PD in transformer oil,and corona in the *** samples for different classes of PD sources are captured under two levels of voltage and two different levels of *** results of this study evaluate the suitability of the proposed classification systems for probabilistic source identification in various insulation ***,of importance to the problem of the PD source identification is to assign a‘degree of membership’to each PRPD pattern,besides assigning a class label to *** of the classifier algorithms studied in this study,such as fuzzy classifiers,are not only able to show high classification accuracy rate,but they also calculate the‘degree of membership’of a sample to a class of *** enables probabilistic interpretation of a new PRPD pattern that is being *** determination of the degree of membership for future PRPD samples allows saf

关键词： pattern membership source

Partial discharge detection and identification at low air pressure in noisy environment

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High Voltage 2021年第5期6卷 850-860页

作者： Ali Nasr Esfahani Saeed Shahabi Behzad kordi Department of Electrical and Computer Engineering University of ManitobaWinnipegManitobaCanada

Increasing demand for electric power in more electric aircraft requires a higher operating voltage for the power system that leads to higher electric stress on the insulation *** at high altitudes where the electrical strength of air is weakened exposes the insulation system to even higher levels of electrical *** such,the probability of partial discharges(PD),which result in insulation degradation and failure,is *** presence of switching circuits in the power distribution system of the more electric aircraft is capable of producing high levels of *** noise in combination with the background noise and parasitic impedances will cause high amplitude ringing in the measured partial discharge signal ***,a method based on the combination of the wavelet and energy techniques is employed to detect PD pulses in a noisy environ-ment under the low air pressure *** verify the technique,a laboratory setup consisting of two separate PD sources mounted in low air pressure(33 kPa)chamber is developed where sine and square waveforms are used as the applied *** ob-tained results demonstrate that the proposed approach offers low computational complexity,high performance in PD phase localization,and robustness in a noisy environment.

关键词： insulation mounted noisy

Sensitivity analysis of a parallel-plate method for measuring the dielectric permittivity of high-voltage insulating materials

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High Voltage 2017年第3期2卷 200-204页

作者： Anton V.Vykhodtsev Behzad kordi.Derek R.Oliver Department of Electrical and Computer Engineering University of Manitoba75a Chancellor's CircleWinnipegManitobaCanada R3T 5V62 Manitoba Institute for Materials University of Manitoba25 Sifton RoadWinnipegManitobaCanada R3T 2N2

Ascertaining the dielectric character of polymeric insulation materials is of particular interest for comparative studies that use accelerated ageing and samples from decommissioned *** the case of polymeric samples,the possibility of physical deformation within the sample holder adds additional variability to comparative *** readily obtainable instrumentation,this study undertakes a systematic sensitivity analysis of a parallel-plate capacitance measurement approach for polymeric materials that only has one capacitance plate in contact with the sample,avoiding issues of sample *** analysis demonstrates that the biggest contributor of uncertainty in the measurement of the relative permittivity and loss tangent is the precision with which the plate–plate and plate–sample separation is *** measurements show that the determination of loss tangent can be susceptible to uncertainties arising from electrical noise,but that these can be controlled further by utilising more refined instrumentation.

关键词： deformation plate analysis

New experimental study on the DC flashover voltage of polymer insulators:combined effect of surface charges and air humidity

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High Voltage 2019年第4期4卷 316-323页

作者： Mohammed Amer Jeff Laninga William McDermid David R.Swatek Behzad kordi Department of Electrical and Computer Engineering University of Manitoba75 Chancellor's CircleWinnipegManitobaCanada R3T 5V6 Manitoba Hydro WinnipegManitobaCanada R3M 3T1

This research provides conclusions that can partially cover the lack of knowledge related to the effects of ambient atmospheric conditions on DC electric power *** polymer insulating materials are used for completing this research *** a climate chamber,the relative humidity is controlled and adjusted from 20%to 80%***,the samples are charged with positive or negative charges by applying±20 kV to the corona-generating ring of *** surface potential is measured using an electrostatic voltmeter and is converted into surface charge density later by applying the probe response matrix *** pre-charged samples are then stressed with high-voltage negative or positive DC values inside the climate chamber over a range of controlled values of the surrounding air humidity until flashover takes *** space charges,which can drift in the air gap to reach the solid surface,are highly affected by the level of the relative humidity of the surrounding ***,increasing humidity results in a reduction of the DC flashover inception voltage and a shorter time to flashover regardless of the voltage ***,the positive or negative flashover inception voltage of both materials increases with pre-deposited negative charges while it decreases with pre-deposited positive charges.

关键词： charges flash humidity

Phase-controlled atom-photon entanglement in a three-level Λ-type closed-loop atomic system

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Chinese Physics B 2013年第6期22卷 211-217页

作者： Ali Mortezapour Zeinab kordi.Mohammad Mahmoudi Institute for Advanced Studies in Basic Sciences P.O.Box 45195-159ZanjanIran Physics Department University of ZanjanP.O.Box 45195-313ZanjanIran

We study the entanglement of dressed atom and its spontaneous emission in a three-level A-type closed-loop atomic system in a multi-photon resonance condition and beyond it. It is shown that the von Neumann entropy in such a system is phase-dependent, and it can be controlled by either the intensity or relative phase of applied fields. It is demonstrated that for the special case of the Rabi frequency of applied fields, the system is disentangled. In addition, we take into account the effect of Doppler broadening on the entanglement and it is found that a suitable choice of laser propagation direction allows us to obtain the steady state degree of entanglement （DEM） even in the presence of the Doppler effect.

关键词： entanglement quantum entropy closed-loop system

Mental training can improve physical activity behavior in adolescent girls

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Journal of Sport and Health Science 2017年第3期6卷 327-332页

作者： Mahboubeh Ghayour Najafabadi Amir-Hossein Memari Ramin kordi.Monir Shayestehfar Mohammad-Ali Eshghi Department of Physical Education and Sport Sciences University of TehranTehran ***Iran Sports Medicine Research Center Tehran University of Medical SciencesTehran ***Iran Neuroscience Institute Tehran University of Medical SciencesTehran ***Iran

Background:Lately,physical activity(PA) in young girls has been frequently discussed,thus we were interested to examine whether a mental training intervention can increase the level of PA in young ***:A sample of 56 girls aged 15.4 ± 0.3 years(mean ± SD) was assigned to either the intervention or control *** then conducted a6-week mental imagery training program on young female *** was evaluated with objective accelerometer *** self-concept was also assessed in all ***:Young females' PA increased after a course of mental training compared to female participants in control ***,physical self-concept improved related to mental training ***:Exercise imagery may be an effective method of PA increase besides psychological enhancement in young girls.

关键词： Accelerometer Exercise imagery Girls Psychological competence Youth

裂纹和污秽瓷绝缘子的电磁场辐射信号特征(英文)

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高电压技术 2011年第11期37卷 2649-2654页

作者： Ehsan Azordegan David R Swatek Behzad kordi Department of Electrical and Computer Engineering University of ManitobaWinnipegMBCanada Insulation Engineering and Testing Department Manitoba HydroWinnipegMBCanada

Porcelain cap and pin insulators are by far the most popular suspension insulators in high voltage(HV) distribution networks all around the *** and condition monitoring of HV insulators is also very important to the utility companies because of the critical and vital role that they play in distribution *** terms of safety, practicality and ease of use,remote detection methods are more popular among the line technicians.A new remote condition assessment method based on electromagnetic radiations from porcelain insulators is presented in this paper. In a lab environment,a string of two porcelain insulators is energized by a 45 kV *** radiations due to the partial discharge activities inside the porcelain insulator are captured by passive sensors and antennas. Two cases of defective insulators on a two insulator string are studied *** first case focuses on the effect of contaminated porcelain shells on radiation signature of partial discharges.A polluted porcelain shell with ESDD level of 0.03 mg/cm^2 was first *** second case studies the effect of cracks of an intentionally-cracked porcelain shell. The cracked insulator is also tested on a two insulator *** compare the partial discharge radiation signature of different faulty insulators,phase resolved graphs were *** electromagnetic radiated signature of a polluted insulator and a cracked insulator was calculated and compared using phase resolved graphs.

关键词： partial discharge electromagnetic radiation contamination high voltage porcelain insulator condition assessment phase resolved graph