Great efforts are now underway to control the coronavirus 2019 disease (COVID-19). Millions of people are medically examined, and their data keep piling up awaiting classification. The data are typically both incomplete and heterogeneous which hampers classical classification algorithms. Some researchers have recently modified the popular KNN algorithm as a solution, where they handle incompleteness

In the global race of development, a huge amount of wastes having different characteristics and potential for environmental pollution are generated from various activities such as manufacturing, mining, processing, treatments, agriculture, etc. Considering the pollution threats to all three components of the environment (air, water and soil), it is highly essential to assess the levels of pollution

Neural Machine Translation (NMT) has attracted growing interest in recent years for its promising performance compared to traditional approaches such as Statistical Machine Translation. However, its application to languages having different structures, like the (English, Arabic) pair that interests us in this work, degrades its performance. Indeed, the limited vocabulary size required by the NMT models

Freeze and thaw processes are mostly observed in cold regions and impact the short- and long-term performances of road pavements. Thus, freeze and thaw processes should be considered when designing and constructing roads due to the potential change it will cause to the structure, arrangement and properties of the materials used in road construction. This study attempted to understand the effect of

In recent years, the use of reclaimed asphalt pavement (RAP) has gained much attention and is widely accepted. However, the rejuvenating agents which are usually used to reduce the rigidity of the aged asphalt are subjected to diverse climate circumstances. The present work used maltene as a rejuvenator to investigate several measurements regarding stripping failure. The evaluation of wettability and

The integration of wireless networks and Internet of things (IoT)-enabled communication between smart grid entities to address the challenges in supply chain including mutual authentication and privacy persistence, and control access scheme is critical in smart grids. In the last decade, numerous control access schemes have been presented. However, existing schemes are not reliable in terms of security

N-[2-(methylamino)ethyl] ethane-1,2-diaminated acrylic fibre (DAAF) derived adsorbent was prepared by the reaction of acrylic fibre with bis(2-aminoethyl)amine. Fourier transform infrared spectroscopy and scanning electron microscopy were employed for elucidating the surface functional groups and morphology of DAAF, respectively. The influence of several process variables on Hg(II) adsorption was also

This paper deals with the fractional-order modeling, stability analysis and control of robotic manipulators, namely a single flexible link robotic manipulator (SFLRM) and 2DOF Serial Flexible Joint Robotic Manipulator (2DSFJ). The control law is derived using Pole Placement (PP) method. This paper uses Mittag–Leffler function for the analysis of SFLRM in the time domain. The stability analysis of the

Probe permeameter has been widely used to obtain measurements and spatial distributions of permeability in both the laboratory and field outcrop applications. It provides cheap, fast, intensive, and nondestructive permeability measurements. In the literature, the difference between steady-state and unsteady-state measurements and the effects of heterogeneity and anisotropy on probe permeameter measurements

In this paper, meta-heuristic tuning of LQR weighting matrices using various objective functions on the experimental flexible arm under the effects of disturbance is investigated. The use of flexible and lightweight systems provides certain advantages such as high operating speeds, low electricity consumption, and low initial investment costs. However, such systems are more prone to vibration-related

Currently, polymers were applied as the most functional additives for optimizing the rheological behavior and filtrate volume control of water-based drilling fluids. To affirm this concept, the present work aims to prepare sodium salt of linear polyacrylic acid (NaLPAA), polyacrylamide (NaLPAM) and their cross-linked polymer hydrogels (NaCPAA and NaCPAM), in different ratios using N,N′-methylenebis(acrylamide)

This work proposes stochastic genetic algorithm-assisted Fuzzy Q-Learning-based robotic manipulator control. Specifically, the aim is to redefine the action choosing mechanism in Fuzzy Q-Learning for robotic manipulator control. Conventionally, a Fuzzy Q-Learning-based controller selects a deterministic action from available actions using fuzzy Q values. This deterministic Fuzzy Q-Learning is not an

This paper presents a numerical study of erosion–slippage failure of soil between piles caused by underground pipe leaking using the coupled CFD–DEM (computational fluid dynamics–discrete element method) approach. By tracking the change in particles migration and flow fluid during numerical simulation, the development mechanism of erosion–slippage failure is clarified on both microscopic and macroscopic

In the present work, papain enzyme was immobilized on a polymer support chitosan through a linkage of glutaraldehyde to form the [Pap-Glu@Chi] biocatalyst through the covalent bonding method. The immobilization of papain on Chitosan was confirmed by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) which revealed the change in morphology of chitosan due to immobilization

It is a very difficult engineering issue to assess the earthquake performance levels of existing masonry structures and determine whether they require strengthening or retrofitting. The materials used in the production of masonry structures vary from region to region, even within the same structure, and the lack of standard mechanical properties of these materials makes it difficult to define the material

In this article, the boundary layer flow around a thin needle is examined. Non-constant thermal conductivity as well as viscosity is the art of present study. Governing equations are modeled in the presence of frictional heating and are simplified by utilizing boundary layer assumptions. To obtain a self-similar solution, boundary layer equations are further transformed into dimensionless forms by

The intersection of fractures, particularly the intersection of discontinuities, occurs frequently in practical engineering, mainly manifesting as a mixed-mode failure. In the present study, the three-point bend test was conducted on the semicircular bend (SCB) of pre-cracked shale samples with a bedding layer. A numerical model for simulating mixed-mode fracture propagation was constructed using the

In this study, the performance of carbon cloth (CC) modified with iodine (I2) doped polythiophene nanoparticles (PTh-NP) as an anode was investigated in a double chamber microbial fuel cell (MFC) for the purpose of simultaneous power generation and lead (Pb2+) removal using Shewanella putrefaciens as the biocatalyst. The CC with I2 doped PTh-NP displayed good electrochemical characteristics compared

In the original publication the affiliations of the second and fourth authors were interchanged wrongly.

Detecting knives in surveillance videos are very urgent for public safety. In general, the research in identifying dangerous weapons is relatively new. Knife detection is a very challenging task because knives vary in size and shape. Besides, it easily reflects lights that reduce the visibility of knives in a video sequence. The reflection of light on the surface of the knife and the brightness on

Under the construction of extended reach wells, cutting beds are very likely to form due to inadequate wellbore cleaning. The inorganic salts in seawater aggravate this problem by affecting the rheology of drilling fluids. By developing a cutting transport dynamic simulation platform, the reasons and laws of cutting beds formation, damage and removal were revealed. The results demonstrated that cutting

The level shifters (LSs) are the most significant interfacing circuits in multi-supply mixed-signal systems. This letter presents a high-speed and energy-efficient voltage level shifter with wide-range conversion from sub-threshold to I/O voltage. The proposed level shifter with split-control output driver significantly enhances the speed, energy and static power performance. The proposed LS is implemented

Heliostats represent a significant proportion of the cost of central tower concentrating solar power systems; hence, there is a need to reduce the cost of these. One of the challenges faced in doing this is to ensure that any new design is still able to cope with the loads imposed upon it, particularly the aerodynamic loads. Numerous studies have reported the aerodynamic loadings encountered by heliostats

In wireless communication, there is an enormous increase in the number of users which results in spectrum shortage. This can be defeated through dynamic spectrum access scheme and cognitive radio is the best solution to achieve this. A cognitive radio (CR) is programmable, configurable and can dynamically use the spectrum in the wireless environment. One of the important tasks of CR is to perform spectrum

Nimonic C263, a nickel-based superalloy, finds extensive application in manufacturing of complex parts in gas turbine, aircraft and automotive industries exclusively for exhaust sections. Machining of the alloy through traditional approach is a difficult task owing to its poor thermal conductivity, work hardening and high strength properties. However, the superalloy can be machined up to desired accuracy

Today, all smartphones, notebooks, or other communication devices could connect to the cloud, so the data are accessible everywhere. When these devices are interconnected through the internet, they make an Internet of Things (IoT) network that exchanges data among network nodes and other services. IoT has a broad application area from smart applications to various industrial usages. However, the high

One of the most frequently applied materials in cold weather is deicer, which is utilized to maintain winter roads. The effect of various deicers on moisture sensitivity has been explored by researchers in the asphalt industry; however, their effect on thermodynamic parameters and fatigue behavior of asphalt has rarely been studied. In this study, the effect of NaCl, potassium acetate, and calcium

Nowadays, a huge number of web documents are available on the Internet, which makes the retrieval process of a specific topic very difficult, where some irrelevant pages may be retrieved as well. The automatic classification of web documents and pages has an essential application in different domains such as medicine, health, science, and information technology. A large number of web pages classification

Open source software reliability is an important factor affecting the quality of open source software. The developed reliability models of open source software cannot meet the actual evaluation of open source software reliability because of the complexity, dynamics, and uncertainty of open source software development. Considering the dynamic changes of fault introduction in open source software development

In this paper, we investigate the ability of CNN, CNN-LSTM, and BiLSTM-CNN deep learning networks to automatically classify or discover hateful content posted on social media. These deep networks were trained and tested using ArHS dataset which consists of 9833 tweets that were annotated to suite hateful speech detection in Arabic. To the best of our knowledge, this is the largest Arabic dataset which

Psychophysical methods in haptic technology help in comparative study and eventually be a data set to achieve realism over skin sensation. Textural based haptic applications are widely developed using tactile displays over human fingertips. The tactile displays work on open-loop admittance feedback system and are controlled with flexible parameters by ignoring the impact of noise or disturbance variables

Efficient adsorbents were fabricated by modifying the orchard waste biochar (BC) to produce zero-valent iron composited BC (BC/Fe0) and phosphorus embedded BC (BC/P). The efficacy of these adsorbents for copper [Cu(II)] removal from aqueous media was investigated via pH, kinetics, and adsorption batch trials. The solution pH 7 was found optimum for the highest Cu(II) removal. Elovich model was fitted

In order to popularize the application of root pile (RP), which is a miniaturized application after the simplified construction procedure of root foundation and a promising new type of noncircular section pile, and to verify the bearing capacity and efficiency advantages of RP over traditional straight-shaft pile and pedestal pile (SP and PP, respectively), on the basis of validation of the numerical

Evaluation of the hydraulic fracturing effect of shale gas wells is helpful for the design optimization and the adjustment of hydraulic fracturing schemes. Three history matching examples were performed for shale gas wells in the Weiyuan Shale Gas Field, Sichuan Basin, China. Based on the parameters obtained through history matching, the hydraulic fracturing effect of shale gas wells was evaluated

The purpose of underwater acoustic sensor networks (UWASNs) is to find varied applications for ocean monitoring and exploration of offshore. In majority of these applications, the network comprises of several sensor nodes deployed at different depths in water. The sensor nodes which are situated in depth, at the sea bed, are unable to communicate unswervingly with those nodes which are close to the

Automatic text summarization is considered as an important task in various fields in natural language processing such as information retrieval. It is a process of automatically generating a text representation. Text summarization can be a solution to the problem of information overload. Hence, with the large amount of information available on the Internet, the presentation of a document by a summary

The study integrated lithofacies analysis and measurement of total organic carbon "TOC," porosity, and mechanical properties to evaluate the main factors controlling rock strength and elastic properties of three carbonate mudrocks units within the Jurassic succession of Central Saudi Arabia. Textural and microstructural analyses revealed that the former two units (Hanifa Formation Hawtah Member and

The double-pendulum (DP) phenomenon, effectuated by the fact that the payload configuration and the chain length between the hook and the payload are usually unknown, is a typical issue in actual cranes. This phenomenon is considered in the current study to enhance tracking accuracy and sway regulation for overhead cranes subject to perturbations and multiple frictions. A novel smooth super-twisting

An oversized pit-in-pit (PIP) excavation, which comprised an octagonal pit outside and two cross-shaped pits inside, was excavated in soil-rock mixed strata, Shenzhen, China. There were two shield tunnels connected to the north and south of the PIP excavation after the main structures completed. Extensive instruments were adopted throughout the construction process to guarantee the safety of the project

Electrocardiogram (ECG) signals are damaged by various types of noise during acquisition and transmission which may mislead the analysis. In this paper, an automated denoising technique based on time–frequency filtering approach is proposed. The S-transform based time–frequency method with morphological processing is employed to visualize the spectrum of the ECG signal. The time–frequency plane is

Intelligence modeling interpretable for incipient fault diagnosis of batch process represents a serious challenge. For the multivariate, nonlinear, and high-dimensionality characteristics of process data, existing fault diagnosis solutions are easily concealed by noise while neglect the low amplitude and noise interference of the incipient faults. In this paper, an intelligent incipient fault diagnosis

Due to the influence of complex downhole conditions and inherent brittleness of cement, cement is easily broken, resulting in interlayer sealing failure. To solve this problem, basalt fiber is used to enhance the mechanical properties of cement paste. However, due to the weak adhesion between the fiber and the cement base, the excellent mechanical properties of the basalt fiber cannot be fully exerted

As a new tool of hard rock breaking, abrasive slurry jet (ASJ) is of great potential in tunneling and mining. Therefore, this paper presents a new system, shearer drum assisted by ASJ, to exploit thin seam with complex geology, in which coal rock will be broken by the coupled forces of ASJs and cutting picks. Then, an orthogonal experiment is carried out to study the effects of parameters (mass fraction

This paper discusses a set of hybrid predictive and descriptive model to estimate the emission of \(\hbox {CO}_{2}\) in tropical reservoirs based on field measurements of physical and chemical water quality parameters. With this model, it is possible to evaluate the influence of the water quality on the greenhouse gases (GHG) emission at the reservoir and predict the GHG emissions. The quality of the

In-place analysis for offshore platforms is essentially required to make proper design for new structures and true assessment for existing structures. The structural integrity of platform components under the maximum and minimum operating loads of environmental conditions is required for risk assessment and inspection plan development. In-place analyses have been executed to check that the structural

The ground subsidence accident caused by the instability of shield tunnel face has been a major problem that puzzles urban subway construction in weak rock. Maintaining the stability of tunnel face is the key to ensure the safety of shield construction and reduce the environmental impact. In view of the shield with a diameter of 8600 mm in Chengdu metro line 18 through the sandy cobble stratum, it

Given the diversity of styles and sizes in apparel, marker planning which aims to arrange and move all the pattern parts of garments onto a long thin paper before the cutting process is a very important process for the apparel industry. In order to decrease the wastage of fabric after the cutting process, the marker layout essentially needs to be as compact as possible. In this paper, hybrid heuristics

This paper proposes a novel nonlinear adaptive controller for the synchronization of two identical unknown chaotic systems. The proposed controller accomplishes fast convergence of the steady-state error to the origin and reduces the amplitude of the oscillations in the error signals during the transient. The rapid convergence increases the disturbance rejection attributes of the controller. The reduction

This paper provides a simplified design approach for estimating the lateral–torsional buckling (LTB) strength of the pultruded glass fiber-reinforced polymer (GFRP) composite I-beams. A detailed finite element (FE) model based on ABAQUS incorporating more realistic parameters for pultruded GFRP I-beam is developed and verified against the test results available in the relevant literature. After achieving

Olive leaf spot or peacock eye disease caused by Spilocaea oleagina is one of the most common diseases attacking olive trees all over the world. Control of the disease by application of copper fungicides is not always feasible and requires proper management practices. The use of plant extract is considered a safe alternative to the harmful effect of chemical fungicides. In this work, different concentrations

In this paper, an interleaved buck–boost n-phase converter with the soft-switching operation is proposed. All the switches are switched at zero voltage by applying an inductor between every two consecutive phases. These inductors cause the soft-switching operation through all switches of the converter by discharging the inherent voltage of switches’ capacitor and keeping the voltage of switch at zero

The problems of high elastic modulus and poor friction and wear properties should be investigated and solved for further promotion of the application of biomedical alloys. For the first time, Zr–4Cu–xNb–xSn (x = 0, 0.25, 0.5, 1) biomedical alloys with low elastic modulus and excellent tribological performance are designed and vacuum smelted in this work. Phase analysis and microstructural observation

Nano-food packaging, the emergence of latest technology based on nanomaterials, created enormous trust to the synthesis of novel packaging incorporated by zinc oxide nanoparticles (ZnO-NPs) in polylactic acid (PLA) polymer. The morphology and structure of biogenically fabricated ZnO-NPs by aloe barbadensis leaves extract were analyzed by X-ray diffraction, scanning electron microscopy and Fourier transforms

Ocean sensor data prediction has become a promising means for smart ocean monitoring. In alternative solutions, deep neural networks (DNNs) are considered as a good choice. The determination of activation functions in DNNs has a significant effect on training speed and nonlinear approximation. In this paper, the effect of activation functions on a deep computing model called deep belief echo-state

A 3D internal open-type flaw inside gypsum rock-like specimens is prepared using a volume-loss method. It has three types of flaw inclinations and four types of flaw strike lengths. Uniaxial compression and acoustic emission monitoring tests show a small range of secondary local failures are initially distributed near the internal flaw. The area of these secondary failures remains stable and does not

Detection of the traffic peak periods for a city has many advantages not only in terms of the traffic operation but also in urban transportation planning. In the planning, future travel demand is analyzed for peak and off-peak periods separately and transportation networks are designed based on these analyses. However, the traffic peak periods may shift in time because of changes in people's activities

One of the critical issues in fire dynamic simulation is the selection of suitable combustion model. Typically, combustion models based on infinite fast chemistry are used in fires. In this paper, the flamelet generated manifold (FGM) has been used as a combustion model and the fireFoam solver of OpenFOAM has been used. Two distinct FGMs, with and without radiation coupling, have been investigated

Fine powder of magnetite nanoparticles (MNPs) was doped with different contents of copper (Cu) through a mat of graphene oxide (GO) nanosheets. These compositions were incorporated into electrospun nanofibrous membranes of polycaprolactone (PCL). Mechanical properties were measured, and examining the ability of these nanofiber membranes to remove methylene blue (MB) dyes from aqueous solutions was

This work presents the influence of external pressure (in the range of 0 to 20 GPa) on the optoelectronic and thermoelectric response of magnesium-based perovskites oxide (MgHfO3) in the cubic phase. The calculations have been performed by using Perdew–Burke–Ernzerhof (PBEsol) generalized gradient approximations functional within density functional theory calculation. Our results show a striking transition

The green supplier selection could be regarded as a classical multiple attribute group decision making (MAGDM) issue. The interval-valued Pythagorean fuzzy set (IVPFSs) can fully describe the uncertain information for the risk assessment of science and technology projects. Furthermore, the classical TODIM method based on the cumulative prospect theory (CPT-TODIM) is built, which is a selectable method