bluuebunny/crossref_metadata_2025_split huggingface dataset:
An adaptive reversible jump MCMC inversion algorithm for airborne time-domain electromagnetic data
Authors: Yu Xiaodong , Wang Xuben , Lu Congde , Wang Yuhang 
Published: February 2021

Abstract
The reversible jump Markov Chain Monte Carlo algorithm is a trans-dimensional Bayesian inversion method, which can not only obtain the best inversion solution, but also provide the uncertainty information of inversion parameters, so as to effectively evaluate the reliability of inversion results. However, in trans-dimensional Bayesian inversion, the step size of model sampling has a great influence on the efficiency and precision of inversion. To solve the selection problem of sampling step size, this paper presents an adaptive reversible jump MCMC inversion algorithm for airborne time-domain electromagnetic data. In this method, the sampling step length is automatically adjusted in the sampling process through the data fitting error of each sampling model, so as to avoid the influence of unreasonable sampling step size and improve the acceptance rate of model sampling. The validity of the proposed method is verified by inversion test on the synthetic data and compared with the regularized inversion results. The inversion results demonstrate that the adaptive reversible jump MCMC inversion algorithm can improve the acceptance rate of model sampling and the accuracy of inversion results.
A new software for gravity gradiometry data forwarding and inversion
Authors: Hou Zhenlong , Wei Jikang , Liu Xinwei 
Published: February 2021

Abstract
A new software has been developed specially for gravity gradiometry data forwarding and joint inversion. It is developed with hybrid programming technique and some powerful function libraries, including language of Python and C, Matplotlib, PyQt and so on. The software could help the users with graphical user interface, implement the data import/export and some management, the simple visualization in 2/3 dimension, modeling for gravity exploration data, and 3D density inversion. One of the advantages of this software is combining the popular development techniques to make the research of the forwarding and inversion easily, another one is simple secondary development, which allows the users to add their algorithms to the platform. The software is mainly used for the teaching and scientific research purposes, suitable for the geophysical scientists, engineers and graduate student.
Synthesis and characterization of metal-organic framework (MOF) CoBTC as a non-enzymatic electrochemical biosensor for glucose
Authors: Abrori S A , Trisno M L A , Aritonang R A , Anshori I , Nugraha  , Suyatman  , Yuliarto B 
Published: February 2021

Abstract
Diabetes mellitus is one of the highest causes of death globally, caused by high glucose levels in the blood. Thus, monitoring glucose levels in the blood becomes very important. Non-enzymatic glucose detection is currently an emerging research area, one of which uses Metal-Organic Material (MOF), which has advantages such as having a large surface area and having many micropores. The purpose of this study was to synthesize MOF CoBTC and see its performance as a glucose sensor. The synthesis method used is the solvothermal method, while the sensor performance testing method uses an electrochemical method. The solvothermal method of the CoBTC was carried out at a temperature of 100°C, and the duration of synthesis of 10 hours. The structural characterization of the synthesized samples by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR) Spectroscopy, Brunauer Emmett Teller (BET) Surface Area Analyzer showed that we successfully synthesized CoBTC. Furthermore, the electrochemical characterization via cyclic voltammetry (CV) and amperometry results showed the sensor's optimal working potential at 0.4 V, the sensitivity of 53.455 μA mM-1 cm-2 and the limit of detection (LOD) at 5.49 μM.
A graphene-modified Co-BDC metal-organic frameworks (Co-MOF) for electrochemical non-enzymatic glucose sensing
Authors: Yuniasari R , Amri F , Abrori S A , Septiani N L W , Rezki M , Irzaman  , Fahmi M Z , Yuliarto B 
Published: February 2021

Abstract
In this work, a metal-organic framework (MOF) based on cobalt was decorated with graphene and used as a sensing material for glucose determination with electrochemical principles. The selection of Co-MOF material is based on its porous nature, large surface area, and excellent electrochemical properties. The combination of Co-MOF with graphene (high conductivity) effectively increased the electrochemical sensor current. The fabricated composite owned the good crystallinity with graphene particles attached to the Co-MOF surface. The biosensing performance was evaluated by cyclic voltammetry (CV) with 0.1 M NaOH solution as the bolstering electrolyte. The electrochemical measurement indicated that the prepared materials possessed a well-moved transfer electron between the electrode surface and electrolyte solution. The Co-BDC-3Gr sample obtained the best electrochemical performance with the lowest limit of detection (LOD) of 5.39 μM and the highest sensitivity of 100.49 μA mM-1 cm-2. The selectivity test of the modified Co-MOF was done by comparing the response with other compounds such as dopamine, uric acid, and NaCl. The acquired biosensor had excellent stability, with 93% of the initial response after 30 days of storage.
Design of Piezo-Resistive Type Acoustic Vector Sensor using Graphene for Underwater Applications
Authors: Prabhu Smitha , Pai Amrita B , Arora Gurumukh Singh , Kusshal M R , Pandin Veera , Goutham M A 
Published: February 2021

Abstract
In recent years as the level of radiated noise of submarine drastically got decreased, the requirement of underwater acoustic sensor has become essential for the detection of low frequency acoustic signal. The latest advancement in the field of underwater sensors is the Micro Electro Mechanical Systems (MEMS) sensor. The major advantage of this sensor being determination of directionality along with the measurement of pressure of an acoustic signal. The biological inspiration behind the design of the sensor was derived from fish lateral line sensing system, with piezoresistive transduction principle to obtain the objective of miniaturization and low frequency signal detection. In this paper, we are reporting the design, simulation of an underwater two-dimensional MEMS acoustic vector sensor which exhibits better sensitivity, flexibility when compared to the traditional acoustic vector sensor. In this work, thin film of piezoresistve material, Reduced Graphene Oxide (Rgo) is taken as pressure sensing element instead of traditional polysilicon material and its performance in terms of sensitivity and directivity is analysed. MEMS acoustic vector sensors using Reduced Graphene Oxide and polysilicon were simulated on flexible kapton and silicon substrate respectively using COMSOL Multiphysics 5.5 vesrion. The simulation results indicates that designed vector sensor based on MEMS technology and piezoresistive effect of rGO on flexible kapton substrate is feasible and possesses better sensitivity of -149.47 dB when compared to the sensitivity of -171.37 dB of polysilicon based traditional acoustic vector sensor. The simulated value of eigen frequency of the sensor is found as around 47Hz, which almost matches with the theoretical value of resonance frequency of the sensor as per the design considerations of the sensor and hence capable of detecting low frequency acoustic signals.
Simulation of exhaust gas energy recovery system using turbocompounding for a motorcycle engine
Authors: Joshi Srivatsa S , Deshpande Aditya 
Published: February 2021

Abstract
The project aims to recover the energy from the waste exhaust gas and utilize it for application such as battery charging of hybrid electric vehicles. The concept used for energy recovery is electric turbo-compounding which encompasses a turbine integrated with the exhaust manifold of an automobile. The exhaust gases are allowed to expand through the surface of blades of the turbine imparting the energy which can be seen by rotational action of impeller. This motion is captured by a motor generative unit which then produces electric power. The performance of the exhaust gas energy recovery system is simulated on a 390cc motorcycle engine using MATLAB Simulink. The engine was simulated using standard practical low loading and high loading drive cycles such as FTP72, FTP75 (city driving cycles) and US06 (highway driving cycle). Results from the simulation indicate a considerable amount of energy recovery from the exhaust gases of an engine under the above-mentioned driving cycles. Considering the amount of energy recovered, the next focus is to optimize the current system.
Effective Load Management System for Sudden Shutdown Avoidance of Stand Alone Photovoltaic Operation
Authors: Isa Nuratiqah Mohd , Bakar Amirah Nurhafizah Abu , Sarif Nurul Husna Mohd , Karim Mohamad Shaiful Abdul , Shah Ahmad Syahiman Mohd 
Published: February 2021

Abstract
Stand-alone system is the system that operates independently of the electrical grid. Conventionally, the energies absorbed through photovoltaic modules are stored in batteries to reserve for night-time use. Moreover, the function of batteries in stand-alone system is to stabilize the output supplied for the load particularly during the fluctuating circumstance. Sudden shutdown of dedicated photovoltaic system during this period may occur when the storage of batteries approaches empty level which may significantly degrade the lifespan and performance of the batteries. In this study, a sequential load switching system is introduced in order to over-come the sudden shutdown of storage battery-based photovoltaic system. The developed system is mainly equipped with Arduino, MOSFETs and DC bulbs as microcontroller, high-speed switching and load, respectively. As a result, the proposed sequential load switching method is highly effective since it has successfully extended the standby time period up to approximately 27 times longer, before the system shutdowns at the cut-off voltage.
Crystal structure and optical properties of non-vacuum solution-based processed Cu2ZnSnS4 (CZTS) thin-film
Authors: Nugroho H S , Refantero G , Prima E C , Panatarani C , Suyatman  , Nugraha N , Yuliarto B 
Published: February 2021

Abstract
Cu2ZnSnS4 (CZTS) material has emerged as an attractive material for the absorber layer in solar cells application. CZTS has similar properties with its successful predecessor CIGS, but CZTS offers the advantage of low-cost constituents, material abundance, and nontoxicity. We fabricated CZTS thin-film using non-vacuum solution-based process and then the deposition process using the spin-coating technique in the present work. Afterward, we observed that the CZTS thin-film was successfully fabricated with kesterite structure crystal with an optical bandgap of 1.56 eV. We also confirmed that the CZTS thin-film exhibit a high light-harvesting efficiency at a low wavelength suitable for the solar cells application's absorber layer.
A non-uniform excitation Antenna array with defected ground structures for Dual-band 5G mm-wave Applications
Authors: Shashi Kumar D , Suganthi S 
Published: February 2021

Abstract
In this paper, the authors present a non-uniform excitation antenna array with defected ground structures for 28GHz and 40GHz mm-wave applications. The proposed antenna array is simulated using HFSS Ver. 18.2 to analyze the radiation and reflection characteristics. Authors used RT Duroid (εr
= 2.2) with a thickness of 0.782 mm to design the antenna array. To improve the gain and bandwidth, Defected Ground structures are used in the proposed design. Use of Dolph Chebyshev distribution of excitation amplitudes miniaturized the antenna array. The proposed design exhibited a fractional BW of 23.33% and 5.56% at 28GHz and 40 GHz respectively. A peak gain of 8.88 dB and 7.7 dB at 28 GHz and 40 GHz respectively is observed in the simulation results.
Optimum Location of DG for Loss Reduction with Ant Colony Algorithm
Authors: Omar Saodah , Manan Muhammad Nasrullah Abdul , Siam Muhammad Naqib Mat , Samat Ahmad Asri Abd , Daud Kamarul Azhar 
Published: February 2021

Abstract
The ability of the Distributed Generation (DG) to solve problems such as power system deregulation and power demand problems appropriate to its purpose, which is to inject electricity in a distributed manner at a point close to the load, causes the distributed generation to become the latest trend in electricity generation technology. Proper position of distributed generation is necessary in order to achieved maximum benefit from DG, which could be due to an incorrect allocation of DG sources to the power network would not only result in increased power losses, but could also jeopardize the operation of the system. This paper introduces an ACO-algorithm for optimal location of DGs using a real network in one of a rural area of Malaysia. The method is used to determine the effectiveness of DG by comparing the losses of power and the improvement of the voltage profile. As for the confirmation to the ACO method, another method known as brute force method is use to compare the data gain as validation purposes.
Synthesis, identification, antibacterial, and dyeing applications of complexes of hexadentate (N4O2 donor) Schiff base ligands derived from curcumin with some transition and non–transition metal cations
Authors: Ali A M , Al-Noor T H 
Published: February 2021

Abstract
Schiff base ligand (H2CANPT) was prepared by two steps: first, by the condensation of curcumin with 4-amino antipyrin produces4,4′-(((1E,3Z,5Z,6E)-1,7-bis(4-hydroxy-3-methoxyphenyl)hepta-1,6-diene-3,5-diylidene)bis(azanylylidene))bis(1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one) (CANP). Second, by the condensation of (CANP) with L-tyrosine produces2,2′-(((3Z,3′Z)-(((1E,3Z,5Z,6E)-1,7-bis(4-hydroxy-3-methoxyphenyl)hepta 1,6-diene-3,5-diylidene)bis(azanylylidene))bis(1,5-dimethyl-2-phenyl-1,2-dihydro-3-H-pyra-zole-4-yl-3-ylidene))bis(azanylylidene))bis(3-(4-hydroxyphenyl)propanoic acid) (H2CANPT). The resulted Schiff comported as hexadentate coordinated with (N4O2) atoms, then it was treated with some transition and non-transaction metal ions, such as (Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Cd(II), Hg(II) chloride and Ag(I) as nitrate to synthesize complexes. All the prepared compounds were identified using FT-IR, UV-visible, elemental analysis (C.H.N), 1H and 13C-NMR, molar conductivity and magnetic susceptibility. Schiff base and its complexes were tested against two types of bacteria (Staphylococcus aureus and Escherichia Coli). Besides, they were tested as dyes on cotton fibres.
Elastomeric composites for Arctic conditions: operation features and development experience
Authors: Petrova N N , Portniagina V V , Mukhin V V , Dyakonov A A , Ivanova S F , Timofeeva E N , Morozov A V , Okhlopkova A A 
Published: February 2021

Abstract
Operation of elastomeric materials in the extreme climatic conditions of the North is complex and expensive, since not always existing materials can provide the required level of low-temperature characteristics (down to - 60 °C). This leads to failure of machines and mechanisms, equipment downtime, additional costs for repair or replacement of elastomeric parts. This study investigates the features of elastomeric composites operation in cold climates and the results of full-scale tests with simultaneous exposure to naturally low temperatures and hydrocarbon environments in Yakutia (Siberia, Russia). It presents the main principles of creating elastomeric composites for sealing purposes with high frost resistance and examples of recent developments. To obtain elastomeric materials of high frost and oil resistance new rubbers of high frost resistance as Hydrin T6000 epichlorohydrin rubber (Tg = - 60 °C), and traditional rubbers (nitrile etc) were used. For elastomer modification we used carbon nanotubes, collagen hydrolysate and polymer mixtures. Different type of developed materials is a double-layer material based on ultra-high-molecular-weight polyethene (UHMWPE) and nitrile-butadiene rubber-based elastomeric composite. The effect of diphenylguanidine on the interaction of UHMWPE with elastomeric composite based on nitrile butadiene rubber and adhesion at the interface was investigated. The operating properties were studied by standard methods and the structure of the obtained materials was studied using electron microscopy.
Characteristics of magnetic parameters of granular samples with various relative length
Authors: Sandulyak A A , Sandulyak A V , Ershova V A , Sandulyak D A , Polismakova M N , Tkachenko R Y 
Published: February 2021

Abstract
The experimental data of magnetic flux and induction in ferromagnetic granular samples (filling of balls with 8mm diameter in a cylindrical container with diameter D = 40mm) have been obtained with various relative lengths of samples L/D = 1-16 in a magnetizing field with strength range H = 9.4-47.2kA/m. These data have been used to determine the corresponding dependencies families of magnetic permeability, susceptibility, and magnetization, as well as the demagnetizing factor data of such samples. The absence of magnetic saturation of granular (as opposed to solid) magnetics in the considered range H has been revealed (by analyzing the trend of induction field dependencies and especially magnetization). From the experiment, it is evident that in this range H field dependencies of such parameters, as magnetic permeability and susceptibility demonstrate weakly expressed non-sharp extreme. From the experiment, it is also evident that for the studied samples (as quasisolid magnetics) the transition value L/D=[L/D] = 10-12, i.e., significantly lower than for solid samples, particularly those made of steel. The dependence of demagnetizing factor data on L/D has been obtained for “short” samples (1 ≤ L/D < [L/D]). In addition, eligibility of approximation by exponential expression has been shown for this data.
Synergistic Effect of H2O2 Addition on Gamma Radiolytic Decoloration of Some commercial Dye Solutions
Authors: Fartode Anoop P , Fartode S A , Shelke Tushar R , Parwate D V 
Published: February 2021

Abstract
Gamma radiations have emerged as a potential tool to degrade and decolorize the industrial effluents containing synthetic dyes in eco friendly and efficient manner. The dose and exposure time required to achieve the efficient decolration are quite high using gamma radiations alone during gamma radiolysis of synthetic dyes. Studies have revealed that, it can be brought down significantly on addition of H2O2 as it enhances the degree of decoloration. This happens due to the formation of highly oxidizing •OH radicals that are formed due to rapid reaction of H2O2with hydrated electrons formed during radiolysis of water. Further as the dose of H2O2 increases, extent and rate of decoloration also increases up to a certain value referred to as critical dose. But further increase in dose of H2O2 beyond this critical value affects the extent of decoloration adversely. In present communication, the gamma radiation induced decoloration of Methylene Blue, Malachite Green and Indigo Carmine dyes was achieved using various doses of H2O2. It was observed that, the value of H2O2 Critical dose required for efficient decoloration varies from dye to dye indicating its dependence on structure and concentration of dye solutions.
Preparation & characterization of CuS thin films via spray pyrolysis technique for photovoltaic applications.
Authors: Mary Pradeepa V , Kesavan K 
Published: February 2021

Abstract
Copper Sulphide (CuS) is a p-type semiconductor material widely used in photovoltaic applications. CuS thin films have been coated on a glass substrate at 300°C by spray pyrolysis technique. Copper Sulphate in different concentrations with constant concentration of Thiourea (without any complexing agent) was used as a precursor to fabricate the films. The different properties of the films were characterized. Their structural properties were done by X-ray diffraction. XRD analysis showed that the films are high crystalline in nature. The morphological properties were done by SEM and EDX. The atomic percentage of CuS particles were recorded by EDX. The optical properties were studied by UV-Spectrometer in visible to infrared region. The band gap value of the film varied from 2.2eV to 2.7 eV with the different concentration of Copper Sulphate.
Job Assignment Problem Using Union Group Graph Labelling
Authors: Sarika S G , kumari P.V Usha 
Published: February 2021

Abstract
Let SG
be the group and SG
be a collection of subgroups of SG
Then the union group graph of SG
is a graph denoted by U(SG) whose vertex set is SG
itself and two vertices Li
and Lj;i≠ j in SG
are adjacent if and only if either Li
⊆ Lj
or Lj
⊆ Li for i ≠ j. A graph G is said to be union group graph on SG
if U(SG) ≅ G for some collection SG
of subgroups of SG
. This paper describes a simple union group labelling applied in job assignment problem. The task problem related to union group labelling is one of the fundamental combinatorial problems in the branch of optimization. Key words-union group graph, groups, bipartite graph, job assignment problem
Design, Synthesis of E-N-substituted-dichlorobenzylidene-2-(pyrrolidin-1-yl)ethanamine Schiff bases derivative and their DFT studies
Authors: Jeyashri KR , Dhineshkumar E , Logeshwari G , Enbaraj E , Ramyadevi VJ , Manikandana H , Seenivasan M , Rajathi V , Chakkaravarthy J , Govindaraju R 
Published: February 2021

Abstract
Three Schiff bases were synthesized with ethanamine through the reaction of various benzaldehydes. The characterization of these compounds was carried out using IR spectroscopy, molecular measurements, thin-layer chromatography, melting point determination, and other physical attributes. IR spectra show the frequency of stretching from 1619 to 1626 cm−1 for imino groups (C=N) that are typical of Schiff bases. The spectral findings obtained were confirmed by molecular observations using the density functional theory (DFT) based on B3LYP/6-31G (d, p) and were carried out prior to experimental work. In order to approximate the relative stability and reactivity of synthesized compounds 1-3, global descriptors of DFT chemical reactivity were measured and used. Furthermore, compounds 1-3, MEP maps, and orbitals of the molecular frontier were carried out and the results obtained were consistent with the electronic properties. DFT measurements indicate a strong correlation with Schiff bases derived from chemical reactivity descriptors.
Interpolatory projection technique for Riccati-based feedback stabilization of index-1 descriptor systems
Authors: Uddin Mahtab , Monir Uddin M , Hakim Khan M A , Rahman Md Motlubar 
Published: February 2021

Abstract
The work aims to stabilize the unstable index-1 descriptor systems by Riccati-based feedback stabilization via a modified form of Iterative Rational Krylov Algorithm (IRKA), which is a bi-tangential interpolation-based technique. In the basic IRKA, for the stable systems the Reduced Order Models (ROMs) can be found conveniently, but it is unsuitable for the unstable ones. In the proposed technique, the initial feedback is implemented within the construction of the projectors of the IRKA approach. The solution of the Riccati equation is estimated from the ROM achieved by IRKA and hence the low-rank feedback matrix is attained. Using the reverse projecting process, for the full model the optimal feedback matrix is retrieved from the low-rank feedback matrix. Finally, to validate the aptness and competency of the proposed technique it is applied to unstable index-1 descriptor systems. The comparison of the present work with two previous works is narrated. The simulation is done by numerical computation using MATLAB, and both the tabular method and graphical method are used as the supporting tools of comparative analysis.