faults/fractures detection is an essential step of the full field study in hydrocarbon reservoir. definition of exact location of these structural events is a critical step to optimize location of the development wells. despite of the fast development of the geo science technology and oil industry in recent years, detection of the small geological events such as faults and fractures in some of ...

A new single-phase transformerless grid-connected PV inverter is presented in this paper. Investigations in transformerless grid-connected PV inverters indicate the existence of the leakage current is directly related to the variable common-mode voltage (CMV), which is presented in detail. On the other hand, in recent years it has become mandatory for the transformerless grid-connected PV inver...

Purpose: Developments in Industry 4.0 technologies and Artificial Intelligence (AI) have enabled data-driven manufacturing. Predictive maintenance (PdM) has therefore become the prominent approach for fault detection diagnosis (FD/D) of induction motors (IMs). The early FD/D IMs are critical processes, considering that they constitute main power source industrial production environment. Machine...

knowledge-based firms play a critical role in economics of developing countries. innovation and entrepreneurship are two important factors for sustainable development of these firms. corporate entrepreneurship and recognizing factors impacting them have become important in recent years. the purpose of this paper is to examine the relations between corporate entrepreneurship, market orientation ...

Intelligent condition monitoring and fault diagnosis by analyzing the sensor data can assure the safety of machinery. Conventional fault diagnosis and classification methods usually implement pretreatments to decrease noise and extract some time domain or frequency domain features from raw time series sensor data. Then, some classifiers are utilized to make diagnosis. However, these conventiona...

background this study aimed to evaluate the effectiveness of intravenous immunoglobulin (ivig) and combination of ivig and methylprednisolone for childhood idiopathic (autoimmune) thrombocytopenia (itp) treatment; in addition investigate the related factors to develop chronic form of under 15 years itp. materials and methods this retrospective study conducted on 88 itp patients that treated wit...

in this paper, a fault diagnosis system based on discrete wavelet transform (dwt) and artificial neural networks (anns) is designed to diagnose different types of fault in gears. dwt is an advanced signal-processing technique for fault detection and identification. five features of wavelet transform rms, crest factor, kurtosis, standard deviation and skewness of discrete wavelet coefficients of...

Fault detection and isolation for two-dimensional (2-D) systems represent a great challenge in both theoretical development and applications. Use of Kalman filters in fault detection has been well developed for one-dimensional (1-D) system. In this paper, a fault detection algorithm is developed for 2-D systems described by the Fornasini & Marchesini (F–M) model. Based on the state estimate fro...