ENP Engineering Science Journal最新文献_第5页

Simplified Diagnosis Method for CHBMIs under Open-circuit Switch or Battery Failure 开路开关或电池故障下CHBMIs的简化诊断方法

ENP Engineering Science Journal Pub Date : 2021-12-31 DOI: 10.53907/enpesj.v1i2.23

O. Kherif, T. Zebbadji, Youcef Gherbi, Mohamed Larbi Azzouze, M. Teguar

{"title":"Simplified Diagnosis Method for CHBMIs under Open-circuit Switch or Battery Failure","authors":"O. Kherif, T. Zebbadji, Youcef Gherbi, Mohamed Larbi Azzouze, M. Teguar","doi":"10.53907/enpesj.v1i2.23","DOIUrl":"https://doi.org/10.53907/enpesj.v1i2.23","url":null,"abstract":"This paper deals with the diagnosis of cascaded H-bridge multilevel inverters controlled by a sinusoidal level-shifted pulse-width modulation technique. For this purpose, the behaviour of 3, 5, 7 and 9-level inverters is studied for regular and faulty operation modes. Three types of recurring faults are considered, namely open-circuit of a switch, damaged and disconnected battery. Under a single fault, the output voltage signals are presented where the impact of each fault is discussed. In order to detect, identify and locate the three types of fault, a signal processing method is proposed, elaborating the output voltage of inverters with and without fault. The obtained results are convincing for the considered cases. The study shows no real correlation between the selected features from one to the other type of fault. Indeed, each fault type has its own trajectory with respect to the evolution of the output voltage characteristics. Thus, localizing the faulty component within the multilevel inverter can be made with no ambiguity. Such findings obviously solve a large part of problems associated with the presence of faults in multilevel inverters. They can help improving the reliability of the inverter in such way it continues working.","PeriodicalId":200690,"journal":{"name":"ENP Engineering Science Journal","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116745192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Numerical investigation on mechanical properties of a nanobiocomposite based on date palm fiber and nanoclays with interphase problem 具有界面问题的枣椰树纤维-纳米粘土纳米生物复合材料力学性能的数值研究

ENP Engineering Science Journal Pub Date : 2021-12-31 DOI: 10.53907/enpesj.v1i2.29

Khaled Meliani, S. Rechak

引用次数: 1

Near Real-Time Low Frequency Load Disaggregation 近实时低频负荷分解

ENP Engineering Science Journal Pub Date : 2021-12-31 DOI: 10.53907/enpesj.v1i2.15

Selim Sahrane, M. Haddadi

引用次数: 0

Analysis and mapping of mining subsidence and underground voids collapse risk using GIS and the weights-of-evidence model for the abandoned Ichmoul mine, Algeria 利用GIS和证据权重模型对阿尔及利亚Ichmoul废弃矿山的开采沉陷和地下空洞塌陷风险进行分析和制图

ENP Engineering Science Journal Pub Date : 2021-12-31 DOI: 10.53907/enpesj.v1i2.46

N. Larachi, A. Bali, Abderrazek Aityahiatene, Malek Ouldhamou

{"title":"Analysis and mapping of mining subsidence and underground voids collapse risk using GIS and the weights-of-evidence model for the abandoned Ichmoul mine, Algeria","authors":"N. Larachi, A. Bali, Abderrazek Aityahiatene, Malek Ouldhamou","doi":"10.53907/enpesj.v1i2.46","DOIUrl":"https://doi.org/10.53907/enpesj.v1i2.46","url":null,"abstract":"The present study concerns the assessment of mining subsidence and old underground works collapse hazard of the abandoned Ichmoul mine (Batna, Algeria) using the geographic information system (GIS) and the weight of evidence method (WofE). After the identification of collapse cases on the site and developing a spatial database for old underground works, topography and geology, the weight of evidence model was applied to calculate the weight of each relevant factor. Five main factors controlling or related to subsidence and underground voids collapse were determined from the probability analysis of existing cases; the underground voids depth, the distance between the underground voids, the landforms slope, the lithology and the distance between the fractures. Conditional independence tests were performed for the choice of factors. For the analysis of the subsidence and underground void collapse spatial hazard mapping, the contrast values, W+ and W- of the each factor evaluation were analyzed. The analysis results were validated using the curve ROC (AUC) with a past collapse case. For all the factors used, the area under the (ROC) curve showed 92 % accuracy. The results obtained can be used for the prevention of mining subsidence and underground voids collapse risks and the mine site rehabilitation.","PeriodicalId":200690,"journal":{"name":"ENP Engineering Science Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132749826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Differential Pressure Technique for Void Fraction Measurement in Gas-Liquid Flow 气液流动中空隙率测量的压差技术

ENP Engineering Science Journal Pub Date : 2021-12-31 DOI: 10.53907/enpesj.v1i2.61

Ammar Zeghloul, A. Azzi, Nabil Ghendour, A. Berrouk

{"title":"A Differential Pressure Technique for Void Fraction Measurement in Gas-Liquid Flow","authors":"Ammar Zeghloul, A. Azzi, Nabil Ghendour, A. Berrouk","doi":"10.53907/enpesj.v1i2.61","DOIUrl":"https://doi.org/10.53907/enpesj.v1i2.61","url":null,"abstract":"Two-phase Gas-liquid flows have many industrial uses, such as hydrocarbon transportation and energy production. The knowledge and an accurate determination of the gas phase's proportion rate in the two-phase mixture known as the gas void fraction is necessary for optimal and secure sizing of the installations where this kind of flow takes place. This paper focuses on the possibility of using a cost-effective differential pressure transmitter to measure the void fraction parameter. It is obtained using a mathematical model derived from the energy balance equation and the measured pressure drop from the vertical upward gas-liquid flow. Results on flow void fraction obtained through the use of the conductance probe method, are used to validate those derived from the pressure drop that is evaluated by employing the differential pressure transmitter. The measurement accuracy of the void fraction measured using the pressure drop technique, is found to be principally affected by the flow pattern. Moreover, the slip ratio between the phases was the primary factor influencing the void fraction measurement by the differential pressure technique.","PeriodicalId":200690,"journal":{"name":"ENP Engineering Science Journal","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116039068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface EMG signal segmentation based on HMM modelling: Application on Parkinson’s disease 基于HMM建模的表面肌电信号分割:在帕金森病中的应用

ENP Engineering Science Journal Pub Date : 2021-07-22 DOI: 10.53907/enpesj.v1i1.27

H. Bengacemi, Abdenour Hacine-Gharbi, P. Ravier, K. Abed-Meraim, O. Buttelli

{"title":"Surface EMG signal segmentation based on HMM modelling: Application on Parkinson’s disease","authors":"H. Bengacemi, Abdenour Hacine-Gharbi, P. Ravier, K. Abed-Meraim, O. Buttelli","doi":"10.53907/enpesj.v1i1.27","DOIUrl":"https://doi.org/10.53907/enpesj.v1i1.27","url":null,"abstract":"The study of burst electromyographic (EMG) activity periods during muscles contraction and relaxation is an important and challenging problem. It can find several applications like movement patterns analysis, human locomotion analysis and neuromuscular pathologies diagnosis such as Parkinson disease. This paper proposes a new frame work for detecting the onset (start) / offset (end) of burst EMG activity by segmenting the EMG signal in regions of muscle activity (AC) and non activity (NAC) using Discrete Wavelet Transform (DWT) for feature extraction and the Hidden Markov Models (HMM) for regions classification in AC and NAC classes. The objective of this work is to design an efficient segmentation system of EMG signals recorded from Parkinsonian group and control group (healthy). The results evaluated on ECOTECH project database using principally the Accuracy (Acc) and the error rate (Re) criterion show highest performance by using HMM models of 2 states associated with GMM of 3 Gaussians, combined with LWE (Log Wavelet decomposition based Energy) descriptor based on Coiflet wavelet mother with decomposition level of 4. A comparative study with state of the art methods shows the efficiency of our approach that reduces the mean error rate by a factor close to 2 for healthy subjects and close to 1.3 for Parkinsonian subjects.","PeriodicalId":200690,"journal":{"name":"ENP Engineering Science Journal","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127575132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

HPLC Method Development for the Fast Separation of a Complex Explosive Mixture 高效液相色谱法快速分离复杂炸药混合物的研究

ENP Engineering Science Journal Pub Date : 2021-07-22 DOI: 10.53907/enpesj.v1i1.17

Benmalek Boulesnam, Fahim Hami, D. Trache, T. Ahmed Zaid

{"title":"HPLC Method Development for the Fast Separation of a Complex Explosive Mixture","authors":"Benmalek Boulesnam, Fahim Hami, D. Trache, T. Ahmed Zaid","doi":"10.53907/enpesj.v1i1.17","DOIUrl":"https://doi.org/10.53907/enpesj.v1i1.17","url":null,"abstract":"The growing threat of terrorism in many parts of the world has called for the urgent need to find rapid and reliable means of analyzing explosives. This is in view to help forensic scientists to identify different swabs from post-blast debris. The present study aims to achieve an efficient separation and identification of a mixture of sixteen explosive compounds (including nitroaromatics, nitramines, and nitrate esters) by high performance liquid chromatography using a diode array detection (HPLC/DAD) and an Agilent Poroshell 120 EC-120 C18 column at two wavelengths (235 and 214 nm). Relevant chromatographic parameters such as capacity factors, resolution, selectivity and number of theoretical plates have been optimized in order to achieve the best separation of the different components. In this respect, the effects of various parameters such as gradient time, column temperature, flow rate of mobile phase and initial percentage organic mobile phase on the separation of these compounds were investigated. It was revealed that the method allowed a fairly acceptable separation of all the compounds in less than 15 minutes except for two isomers, namely 4-A-2,6-DNT, 2-A-4,6-DNT and 2,6- DNT which could not be resolved by the used C18 column. This shortcoming notwithstanding, the developed method produced satisfactory results and demonstrated sensitive and robust separation, furthermore indicating that the HPLC developed method can be both fast and efficient for the analysis of complex mixtures of explosive compounds.","PeriodicalId":200690,"journal":{"name":"ENP Engineering Science Journal","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123471971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-conventional Band-notched UWB Antenna Design Based on Genetic Algorithm 基于遗传算法的非常规带缺口超宽带天线设计

ENP Engineering Science Journal Pub Date : 2021-07-22 DOI: 10.53907/enpesj.v1i1.26

K. Fertas, Soufiane Tebache, F. Fertas, R. Aksas

引用次数: 4

Conditional and Unconditional Deterministic Bounds on the MSE of the Non-Uniform Linear Co-centered Orthogonal Loop and Dipole Array 非均匀线性共心正交环和偶极子阵列的MSE的条件和无条件确定性界

ENP Engineering Science Journal Pub Date : 2021-07-22 DOI: 10.53907/enpesj.v1i1.11

T. Bao, M. N. El Korso

引用次数: 0

Fullers Earth Treatment for Esters Liquids used in Power Apparatuses: Inferences and Arguments 动力装置用酯类液体的富勒土处理:推论与论证

ENP Engineering Science Journal Pub Date : 1900-01-01 DOI: 10.53907/enpesj.v1i1.33

I. Fofana, Yohan Bergeron, Marie-Pier Gagnon, J. Tremblay, L. Loiselle, K. Yapi, Mohan Rao Ungarala

{"title":"Fullers Earth Treatment for Esters Liquids used in Power Apparatuses: Inferences and Arguments","authors":"I. Fofana, Yohan Bergeron, Marie-Pier Gagnon, J. Tremblay, L. Loiselle, K. Yapi, Mohan Rao Ungarala","doi":"10.53907/enpesj.v1i1.33","DOIUrl":"https://doi.org/10.53907/enpesj.v1i1.33","url":null,"abstract":"Insulating Liquids are widely used for their electrical and thermal properties in power apparatuses, particularly at the level of liquid-filled transformers. With the shift in engineering aspects towards sustainable development, it is important to find a sustainable solution with ecofriendly nature. Therefore, alternative (biodegradable) liquids are of high importance in the global transformer communities. In the present study, the alternative dielectric fluids (ester-based) feasibility for potential regeneration with Fuller’s earth is investigated. The experimental results are confined to the reclamation temperature as well as the ratio of Fuller's earth (the sorbent) and the liquid. A suitable laboratory treatment apparatus is designed and is adopted in this study. Promising measurements to comment on the effectiveness of the treatment have been performed at controlled treatment temperature and sorbent-liquid ratio with the ASTM 7150-13 as a reference norm.The results of this study allowed 80°C and 1 g/30 ml as affirmative conditions for the present experimental conditions. Diagnostic measurements include turbidity, particle counter, and UV spectrophotometry before and after treatments. It is inferred that fuller’s earth is not a promising sorbent for the reclamation of ester liquids.","PeriodicalId":200690,"journal":{"name":"ENP Engineering Science Journal","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131764776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0