bluuebunny/crossref_metadata_2025_split huggingface dataset:
Single weighted laterally constrained inversion of airborne transient electromagnetic data with sharp boundary
Authors: Lu Juntao , Lei Da , Zhang You , Zheng Fanghua 
Published: February 2021

Abstract
Traditional laterally constrained inversion (LCI) can quickly and efficiently invert large geophysical data with minimizing the difference between adjacent model parameters. However when processing the data with large boundary differences, the inversion generates the result whoes the boundaries are poorly fitness with the actual underground geology. In order to overcome this problem, some specific measurement stations of original LCI has been adjusted to weaken the horizontal continuity constraint of the horizontal direction near the sharp boundary. The simulation results show that the determinations of station and weights value depend on the thickness or depth change at sharp boundary. In this paper, we employed single weighted laterally constrained inversion (SWLCI) method on the model with sharp boundary. The result showed that SWLCI can improve both the recovering of sharp boundary and the stability of inversion.
Numerical modelling for elastic wave equations including rotational deformation and strain gradient
Authors: Wang Zhiyang , Chen Chaopu , Li Youming , Liu Hong , Bai Wenlei 
Published: February 2021

Abstract
In this work, through introducing the first and second derivatives of strain gradient into the strain energy density function that depends only on the classical strain in conventional continuum mechanics theory to describe the microscopic interactions, the elastic wave equations including rotational deformation and strain gradient based on the Aifantis’s strain gradient theory is derived. The elastic wave equations including rotational deformation and strain gradient with consideration of the scale effects caused by the microscopic interactions will make seismograms appear obvious changes, which are reflected in amplitude attenuation and dispersion, especially P-wave and S-wave propagate in a dispersive manner based on this theory. The results of numerical modelling and theoretical analysis verify this conclusion. The closer the wavelength is to the characteristic scale of the media (lattice size and interparticle distance), the macroscopic response which results from the microscopic interactions becomes more prominent. To further study the effects of microstructure interactions, we compare the results of numerical modelling with the real data when high-speed train passed the piers in Dingxing County in both time and frequency domains, some conclusions are drawn from the comparison.
Residual stress analysis of friction stir welded AA6063 pipe butt joint by neutron diffraction technique of ENGIN-X
Authors: Ismail Azman , Lee Tung Lik , Awang Mokhtar , Rahman Fauziah Ab , Salih Nabihah , Baharudin Bakhtiar Ariff , Khalid Puteri Zarina Megat , Hamid Darulihsan Abdul 
Published: February 2021

Abstract
Residual stress refers to stress that remains in a structure when all applied stresses have been removed. It is important because the combination with applied stress can cause failure at the level below at which the failure could occur. A study has been carried out using the non-destructive neutron diffraction (ND) technique of ENGIN-X to quantify the redistribution of residual stresses in a pipe. A three-dimensional residual stress-measurements test is fully performed on a 89 mm (3.5 in) diameter pipe in AA6063 grade aluminium (5 mm wall thickness) containing a girth friction stir weld. The results have shown an opposite residual stress effect due to tool rotational speed increment especially on the retreating side of the weld. This weld residual stress analysis is an important factor for Fitness-For-Purpose Assessments. This residual stress measurement data provides a basis for structural integrity assessment and inspection planning.
Fabrication and characterization of epoxy resin–barium titanate at G-band using waveguide technique
Authors: Hasan Nurulfadzilah , Hussain Nur Shahira Mat , Razak Nur Hazimah Syazana Abdul , Shah Ahmad Syahiman Mohd , Karim Mohamad Shaiful Abdul 
Published: February 2021

Abstract
In this paper, fabrication process of epoxy resin-barium titanate nanocomposite and measurement of its complex permittivity are presented. The material is prepared by mechanical mixing of epoxy resin and barium titanate nanopowder. The nanocomposite is intended to be used as high permittivity microstrip antenna substrate, which requires accurate measurement of its electrical characteristics. Thus, characterization of materials is done using waveguide technique, which does not require a precise machining of sample’s width and thickness, and does not utilize small reflection coefficient, which can cause error in measurement. The complex permittivity of the nanocomposite is measured in G-band (4 to 6 GHz). Then, the measured values are compared with prediction method, Lichtnecker and Maxwell-Garnet method. The results show that the measured permittivity of composite materials are in good range with prediction method, while the measurements of loss tangent show that the developed materials are low-loss and suitable to be used as substrate of antenna.
Thermal analysis of a Thermoelectric Generator (TEG) using FEM technique
Authors: Prajwal K T , Bhat Pritam 
Published: February 2021

Abstract
Finite Element Method (FEM) is one of the numerical technique based on minimization of energy, developed to solve complex engineering problems by converting governing differential equations of the physical phenomenon into algebraic equations that can be easily solved by a computer. Finite Element Analysis (FEA) is a computer application that uses FEM technique to analyze the physics of given problem based on the user inputs provided such as material data, geometry, and other pre requisites to study the behavior and structural strength in case of structural mechanics. A device working on principle of Seebeck-Thomson effect is Thermoelectric Generator (TEG) that converts the difference of heat energy into electrical energy. Thermal analysis of a TEG is a necessary step in design engineering as the electricity generated by the device is dependent on the difference in heat flux (temperature difference) between the source and sink (two ends) of TEG. In this paper, Finite Element Analysis of Thermoelectric Generator is carried out. The model is constructed, and thermal analysis is carried out in this paper.
Investigating the fast cooling process of silicene by MD simulation
Authors: On Vo Van , Hung Nguyen Thanh , Huyen Dang Thi Khanh , Trinh Le Thi Phuong 
Published: February 2021

Abstract
This paper presents the results of two-dimensional silicene cooling studies by MD simulation with a sample of 6400 atoms. Silicene after melting to 3500K, it is cooled at a rate of 1013K/s to a temperature of 300K. Investigation of the dependence of energy on temperature shows a jump in the average total energy of molten silicene at the temperature T = 1772K. Investigations on the radial distribution function g(r), coordinate number distribution, ring distribution, and angular distribution all show that the freezing temperature of silicene is about 1772K. When cooled to 300K, silicene is in crystalline form, but the ratio of the defects is quite high and approximately 37.5%.
Cold forging of silicon carbide particulate (SiCp) reinforced aluminium metal matrix composite preforms
Authors: Agrawal M , Singh S 
Published: February 2021

Abstract
The present paper investigate the forging of Aluminium metal matrix composite with Silicon Carbide particles (SiCp) as reinforcements. The generic shaped preform specimens were forged under cold conditions (room temperature) using open-die sets. The Aluminium metal matrix composite material under consideration was fabricated via liquid stir casting manufacturing route, where the pre-heated Silicon Carbide particles were mixed with the molten Aluminium casting alloy. The preforms with standard dimensions were machined obtained from the cast. To analysis the deformation characteristics, two different generic shapes of the preform were considered, i.e. disc and rectangular shape preforms. The present paper presents both theoretical (based on ‘Upper Bound’ approach) and experimental investigations, where theoretical analysis considers a modified interfacial frictional law and preform free barreling. It is expected that the present work will be useful to assess various deformation characteristics during forging of metal matrix composites.
Design and vlsi implementation of a decimation filter for hearing aid applications
Authors: Purushothaman V , Rama devi R , Manjula S 
Published: February 2021

Abstract
Roughly 10% of the total common people experience some kind of hearing misfortune, yet just little level of this measurement utilize the portable amplifier. The shame related with wearing a portable amplifier, client disappointment with listening device execution, the expense and the battery life. Using computerized signal handling the advanced portable amplifier currently offers what the simple listening device can't offer. As of now low power VLSI design is more preferable in digital designs. More and more individuals around the globe experience the ill effects of hearing misfortunes. The expanding normal age and the developing populace are the principle explanations behind this. The pulverization channel utilized for portable amplifier is planned and executed both in MATLAB and Very High Speed Integrated Circuit Hardware Description Language. The obliteration channel is structured utilizing the circulated number-crunching multiplier in Very High Speed Integrated Circuit Hardware Description Language. Each computerized channel structure is reproduced utilizing Matlab and its total engineering is caught utilizing Simulink. The subsequent engineering is equipment productive and expends less force contrasted with traditional decoding channels. Contrasted with the decoding FIR-FIR engineering, the structured decoding channel design utilizing Comb-half band FIR-FIR adds to an equipment sparing and decreases the force scattering.
Fault Diagnosis And Troubleshooting On 2.1kW Grid-Connected Photovoltaic Power System In UiTM Pulau Pinang
Authors: Fadzil Muhammad Faris Fahmi Mohd , Samat Ahmad Asri Abd , Idzwan Tajudin A , Omar S , Daud Kamarulazhar 
Published: February 2021

Abstract
Grid-connected photovoltaic power systems always have a connection to a utility grid via a suitable inverter because a PV array only produces a DC power. This paper presents fault diagnosis and troubleshooting on 2.1 kW grid-connected photovoltaic power system in UiTM Pulau Pinang as a case study network. Grid-connected PV systems has a solar panels that produced a power needed in the day time, however the electricity supplied ongoing by distribution network operator during day night or whenever the solar panels produced low electricity because changes of weather (cloudy or rainy day). The case study network was selected because of a fault frequently occur and make the system unstable. The functionality of the case study network has been tested and troubleshooting has been carried out to identify the cause of the problems. Troubleshooting process had been done on the DC and AC side of the system by creating a troubleshooting table. The DC side of the system free from a fault, as proved by all the equipment in a good condition and PV array able to produce desired output voltage. The fault was occurred in the AC side of the system. The inverter has failed to produce desired output.
RETRACTED: Design of high sensitive glucose concentration sensor of photonic crystal cavity
Authors: Hocini A , Mouetsi S , Hocini A , Saadoune B 
Published: February 2021

Abstract
Photonic sensors, in light of proposed structures comprised of rhombus–molded gaps matched with two waveguides, have been developed as another enthusiasm for specialists in science and technology. In this paper, it has been demonstrated that by utilizing the rhombus–formed openings examination, they got outcomes which are brilliant inside the depression locale. Consequently, the quality factor (Q) and the affectability (S) can be essentially improved for the proposed structure. This investigation are performed by reproduction utilizing limited contrast time area (FDTD). Different affectability are acquired as 494.15 nm/RIU and 445.75 nm/RIU and 482.84 nm/RIU and 483.63 nm/RIU and quality factor as high as 5739.5 and 1.17×104, 8.7×104 and 3489.9 have been accomplished, deducing in a location breaking points of 5.52×10−5, 2.84×10−5, 3.67×10−6 and 9.14×10−4. This blend angle gives the proposed structure an extra exhibition as a component to play out a name free biosensing for the biomedical visualization.
Diagnosing different types of skin carcinoma based on their optical properties: A Monte-Carlo implementation
Authors: Hamdy Omnia , Abdelhalim Ibrahim 
Published: February 2021

Abstract
Skin cancer is a very common and serious type of cancers worldwide. Among many kinds of non-melanoma skin cancers, Basel Cell and Squamous Cell Carcinoma are highly treatable in case of early detection. Various Diagnosing techniques are employed to detect skin cancer, such as dermoscopy, OCT, biopsy and physical examination according to the medical case. However, the non-invasive optical methods are gaining validity due to their competitive advantages including safety and functionality. In addition, they are painless and high sensitive to the examined tissue metabolic changes. The propagation of light in any biological tissue is controlled be its optical absorption and scattering properties that highly depend on the wavelength of the utilized light. Monte-Carlo simulation is a forward numerical method used to describe light propagation in biological tissues depending on their optical parameters. In this work, Monte-Carlo simulation method was implemented to characterize the light propagation in normal dermis, Infiltrative Basal Cell Carcinoma, Nodular Basal Cell Carcinoma, and Squamous Cell Carcinomas in order to differentiate healthy from cancerous tissues. The obtained results provided information about the amount of light reflectance, transmittance, absorbed fraction and fluence rate distribution in the examined tissues showing different values at each condition over a wide range of wavelengths, which provide a simple, safe and functional tool for diagnosing these categories of skin carcinoma.
Recent advances and challenges in management of urea wastewater: A mini review
Authors: Zaher A , Shehata Nabila 
Published: February 2021

AbstractTreating the wastewater with high level of urea and ammonia-nitrogen is one of the problems faced by different plants in the world. The basic methods of urea removal of wastewater streams are electrochemical oxidation, biological treatment, adsorption and hydrolysis using thermal treatment or enzymes and decomposition with the aid of catalyst, strong oxidant. This work reviewed recent of different nanosized and nanostructured particles in different techniques for urea removal from wastewater and the challenges for treatments to draw the attention of researchers and scientists toward novel research ideas in this area.
Single and combined impact of silica fumes with Functionalized multi-walled carbon Nanotubes and nano silica on performance of cement mortars composites
Authors: El-Kattan Ibrahim M. , Khedr M H , Farghali A A , Elsaeidy M , Soliman F N 
Published: February 2021

Abstract
This present work aims to study the impact of single and combined effects of silica fumes (SF) with nano silica (NS) and functionalized multi walled carbon Nanotubes (MWCNTs) on physicomechanical and dynamic properties of cement mortars (CMs). The Portland cement (PC) was partially substituted with different ratios of SF, MWCNTs and NS which, firstly was individually substituted but Secondly, were added together. PC was individually substituted with 2, 4, 6, 8, 10 wt. % of SF then combined with 0.2, 0.4, 0.6, 0.8 and 1.0 wt. % of MWCNTs and 2, 4, 6, 8, 10 wt. % of NS which mixing together. The physicomechanical and dynamic properties such as compressive strength, bending strength, water consistency; both initial and final setting times were measured. The phases of hydration products of some selected samples were additionally investigated by using XRD analyses, the morphology of hardened samples was studied by SEM techniques and TEM showed the particle size of nanoparticles. The results illustrated that, the compressive strength of cement mortars (CM) which containing SF increasing by 27% at 28 days and 11 % for bending strength at early ages comparing to control sample. In combination with functionalized MWCNTS, the compressive and bending strengths increased by 36 and 17 % in case of CMs that containing 0.4 Wt.,% functionalized MWCNTs and 8 Wt.,% SF. additionally, the combination of SF with NS showed increment in compressive strength by 28 % at 8 Wt.,% SF and 8 Wt.,% NS, respectively. SEM-photos showed that CMs containing 0.4 Wt., % functionalized MWCNTs and 8 Wt., % SF had more compacting microstructure than control sample due to bridging effect of MWCNTs and pozzolanic effect of SF.
New design and technological solutions for creating a composite materials recycling tool and methods of their ultra-jet diagnostics
Authors: Li X , Galinovsky A L , Abashin M I , Kravchenko I N 
Published: February 2021

Abstract
The article presents the results of two interrelated studies. The first one is related to assessing the possibility of using a water-polymer ultra-jet as a diagnostic tool for cutting devices that are used for plastic recycling. The second one is related to the development of a new tool design. As a result of the research, it is shown that both the method of water-polymer diagnostics and the proposed design of the knife have prospects to practical application. Rapid wear of the tools for recycling polymer materials is the primary problem that is advisable to eliminate in first order because the idle equipment leads to financial losses. Therefore it is necessary to develop tools with high values of wear resistance and which at the same time have a low cost. A model of a prefabricated tool for recycling composites is proposed, which potentially has high performance properties. The main feature of new tool is its geometric configuration that allows to increase the tool resource and significantly saves the material for its manufacturing. The increase of resource occurs due to the following: if the cutting plate of the tool is worn, it can be removed off the tool, flip it 180 degrees and reinstall. Economy of the material is also due to a decrease in size of the plate, which is fixed to the tool body with countersunk screws head. The research results are confirmed by comparative analysis of various diagnostic methods and strength analysis of the tool.
Radio-shielding metamaterials transparent in the visible spectrum: approaches to creation
Authors: Osipkov A , Makeev M , Garsiya E , Filyaev A , Sinyagaeva K , Kirillov D , Ryzhenko D , Yurkov G 
Published: February 2021

Abstract
The approaches to creation of the materials providing simultaneously high indicators of transparency in the visible spectrum and shielding in a wide radio frequency band are considered in this paper. The analysis and comparison of the main designs of such materials, as well as approaches to their creation, including multilayer and conductive mesh structures, is carried out. The results of our own theoretical studies of the disordered mesh structure are presented, which allow one to obtain a light transmission coefficient from 90 to 98 % in combination with an electromagnetic interference shielding efficiency from 50 to 65 dB. The best results practically achieved to date (shielding efficiency equal 45 dB in the range from 10 kHz to 20 GHz with a light transparency of more than 80 %) were obtained on mesh structures by photolithography, which is a significant limiting factor of this approach. The created multilayer structures show, in general, lower characteristics. However, the technology for their production is better scaled, and the optimization of the thicknesses and chemical composition of multilayer structures can significantly increase them. In this regard, technological aspects may come to the fore when taking into account the possibility of subsequent scaling of the technology and economic indicators when choosing an approach for the implementation of the materials with the required characteristics.
Development of a new diagnostic method for materials abrasion resistance
Authors: Barzov A A , Galinovskiy A L , Vyshegorodtseva A S 
Published: February 2021

Abstract
The article deals with the development of a new diagnostic method for materials abrasion resistance. It lists the advantages of the proposed ultra water-jet abrasive diagnostics method and the disadvantages of existing ones. The implementation diagram of the method, the results of the experiments and the samples images with traces of abrasive jet interaction are presented. The phenomenological ideas of the nature of erosion of interacting materials are highlighted.
Lightweight nodal parts for large space truss structures enabled by SLM: modelling, manufacturing, and testing
Authors: Golubev E , Arkhipov M , Galinovsky A , Klem A 
Published: February 2021

Abstract
Selective laser melting (SLM), as a method of metal additive manufacturing, has developed rapidly over the last years to become a breakthrough technology capable of upending the way that products from aerospace and other various industrial sectors are not only fabricated but also designed. The purpose of this paper is to investigate the potential benefits and drawbacks of SLM implementation in the frame of design and development of components for large space lightweight structures. The three types of the most common structural engineering solutions are compared, based on the different manufacturing techniques and materials. The paper describes the results of the measurement of the shape of fittings after fabrication and cryogenic temperature-cycle tests. An extra option for the weight reduction of structures is given via the implementation of the topology optimization method. Three challenges have been identified, including quality of surfaces, deviation of geometry, residual internal stresses. This work shows the possibility to solve this topical issue by using a waterjet inspection technique and represents one of the first attempts for its implementation to perform a fast evaluation of mechanical properties of structural materials manufactured using SLM.