bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation of Zirconium Carbide Ceramic Coating on Surrogate Kernels Deposited by Plasma-Pulsed Laser Deposition: A Preliminary Study
Authors: Rivai Abu Khalid , Mardiyanto  , Dimyati Arbi , Sumaryo  , Sugeng Bambang , Shabrina Nanda 
Published: May 2020

Abstract
High Temperature Gas-cooled Reactor (HTGR) is one of advanced nuclear reactors with high safety system feature. Indonesia has a plan to build HTGR as an Experimental Power Reactor (in Indonesian: RDE - Reaktor Daya Eksperimental). One of the safety system feature is its fuel system. There are two types of fuel of HTGR i.e. pebble bed type and prismatic type which all of the types are containing TRISO (Tri-Structural Isotropic) which consist of Inner Pyrolitic Carbon, SiC (Silicon Carbide) dan Outer Pyrolitic Carbon. One of the issues of the system is silver (Ag) and palladium (Pd) as the fission product could interact with SiC layer and cause corrosion. One of the candidate to resolve the issue is to replace SiC with ZrC (Zirconium Carbide). In this preliminary study, Zirconium Carbide ceramic has been deposited on a surrogate (uranium-free) fuel microkernels using PLD Plasma-Pulsed Laser Deposition. The parameter during ZrC deposition were temperature of 850°C for the substrate, the number of laser shots of 90,000 and the oxygen background gas with 40 sccm (standard cubic centimeters per minute) with the chamber pressure of 235 mTorr. Thereafter, the samples were analyzed using OM - Microscope Optic, SEM-EDS - Scanning Electron Microscope – Energy Dispersive X-ray Spectroscope, XRD – X-Ray Diffractometer and AFM – Atomic Force Microscope. The results exhibited that the ceramic coating could deposited on the surface of the substrate surface with homogeneously and sticky. The surface was very smooth within the nano-meter range order of ∼80-120 nm of surface roughness. Nevertheless, the results indicated that some of ZrC was react with oxygen at high temperature on the surface of the sample and deposited on the surface of surrogate microkernels.
The Effect of Temperature Variations on Wood’s Metal Plate Melting Simulation by Using MPS
Authors: Hidayati Anni Nuril , Waris Abdul , Andi Mustari Asril Pramutadi , Apriani Nur Asiah , Ifthacharo Melati , Wulandari Rindi 
Published: May 2020

Abstract
Two-dimensional simulation of Wood’s Metal Plate (WMP) Melting Process has been conducted by varying the molten temperature. This simulation was performed by using Moving Particle Semi-Implicit (MPS) method which can calculate the Navier-Stokes and heat transfer equation without divining mesh system. As a substitute, particles are selected to represent every part of simulation such as fluid, wall and dummy type. The experiment of WMP melting process has been conducted by Sudha (2018). The molten Wood’s Metal was originally set at 573 K. In this simulation, the holes formation in WMP will be investigated as a consequence of molten temperature variation. Furthermore, temperature distribution at top side of WMP and solid-liquid phase change will be analyzed for initial temperature of molten are 523 K, 473 K and 423 K. The results show that the phases change significantly in a short time when the molten temperature is increased. However, until the end of simulation which on 1.5 s just for molten temperature 573 K shows the breaching process to the WMP. This study can be implemented when the reactor nuclear severe accident happened.
Thermodynamics and Structural Properties of Ti3SiC2 in Liquid Lead Coolant
Authors: Arkundato Artoto , Hasan Moh , Pramutadi Asril , Rivai Abu K. , Su’ud Zaki 
Published: May 2020

Abstract
It has been investigated by molecular dynamics method the effect of oxygen injection for Ti3SiC2 corrosion inhibition when this material immersed into high temperature liquid lead coolant. The diffusion coefficient of Ti3SiC2 was determined from mean-square-displacement simulation data. The structures of Ti3SiC2 during corrosion inhibition using oxygen agent were observed by Ovito vizualisation code. The simulations have been done using the Moldy molecular dynamics code. Initial material structure as input of simulation generated by Atomsk, Packmol and VESTA codes based on “file 1520829.cif” format file that taken from the crystallography open database (CoD) website. It is from our work we can show that injecting oxygen with concentration about 0.15 – 0.19 wt%, it seems can stabilize the structure of Ti2SiC3 maximally.
Neutronic Aspect Assessment on the use of ZrC Triso-Coated Particle (TRIZO) in a High-Temperature Gas-cooled Reactor (HTGR)
Authors: Miftasani Fitria , Su’ud Zaki , Irwanto Dwi 
Published: May 2020

Abstract
Neutronic calculation has been performed to high-temperature gas-cooled reactor (HTGR) that uses ZrC Triso-coated particle (TRIZO). TRIZO is the most reliable alternative to replace the SiC coating on coated fuel particles because of its superiority in resistance to high temperatures and resistance during the irradiation process. Neutronic aspect analysis of HTGR was carried out by calculating the k-inf and k-eff values on ZrC and SiC coating layers. The materials used were based on the Tri-isotropic (TRISO) coated particle standard used in HTTR 30 MWt, with uranium dioxide and thorium dioxide fuels based. The neutronic aspect with different fuels use ZrC coating layer is also investigated. The calculation shows similar behavior between thorium dioxide and uranium dioxide fuel with ZrC and SiC coating layer. The k-inf and k-eff with ZrC coating layer are lower than the SiC coating layer in both fuels. This value is related to the number of ZrC’s capture cross-section. Comparison between thorium dioxide and uranium dioxide fuel shows that thorium dioxide fuel has higher k-eff and k-inf with ZrC coating layer.
Spatial mapping of short-term solar radiation prediction incorporating geostationary satellite images coupled with deep convolutional LSTM networks for South Korea
Authors: Yeom Jong-Min , Deo Ravinesh C , Adamowski Jan F , Park Seonyoung , Lee Chang-Suk 
Published: May 2020

Abstract
A practical approach to continuously monitor and provide real-time solar energy prediction can help support reliable renewable energy supply and relevant energy security systems. In this study on the Korean Peninsula, contemporaneous solar radiation images obtained from the Communication, Ocean and Meteorological Satellite (COMS) Meteorological Imager (MI) system, were used to design a convolutional neural network and a long short-term memory network predictive model, ConvLSTM. This model was applied to predict one-hour ahead solar radiation and spatially map solar energy potential. The newly designed ConvLSTM model enabled reliable prediction of solar radiation, incorporating spatial changes in atmospheric conditions and capturing the temporal sequence-to-sequence variations that are likely to influence solar driven power supply and its overall stability. Results showed that the proposed ConvLSTM model successfully captured cloud-induced variations in ground level solar radiation when compared with reference images from a physical model. A comparison with ground pyranometer measurements indicated that the short-term prediction of global solar radiation by the proposed ConvLSTM had the highest accuracy [root mean square error (RMSE) = 83.458 W · m−2, mean bias error (MBE) = 4.466 W · m−2, coefficient of determination (R2) = 0.874] when compared with results of conventional artificial neural network (ANN) [RMSE = 94.085 W · m−2, MBE = −6.039 W · m−2, R2 = 0.821] and random forest (RF) [RMSE = 95.262 W · m−2, MBE = −11.576 W · m−2, R2 = 0.839] models. In addition, ConvLSTM better captured the temporal variations in predicted solar radiation, mainly due to cloud attenuation effects when compared with two selected ground stations. The study showed that contemporaneous satellite images over short-term or near real-time intervals can successfully support solar energy exploration in areas without continuous environmental monitoring systems, where satellite footprints are available to model and monitor solar energy management systems supporting real-life power grid systems.
Casimir effect for impurity in periodic background in one dimension
Authors: Bordag M 
Published: May 2020

Abstract
We consider a Bose gas in a one-dimensional periodic background formed by generalized delta function potentials with one and two impurities. We investigate the scattering off these impurities and their bound state levels. Besides expected features, we observe a kind of long-range correlation between the bound state levels of two impurities. Further, we define and calculate the vacuum energy of the impurity. It causes a force acting on the impurity relative to the background. We define the vacuum energy as a mode sum. In order to get a discrete spectrum we start from a finite lattice and use Chebychev polynomials to get a general expression. These allow also for quite easy investigation of impurities in finite lattices.
Content-based Re-ranking Method for Recommendation
Authors: Huang Xin , Bai Jiameng , Peng Jia , Li Min 
Published: May 2020

Abstract
The recommendation system is one of the effective tools to solve information overload. Most of the current deep learning recommendation algorithms only focus on the accuracy of the recommendation results by learning users’ preferences. However, the diversity of the recommendation results is neglected, resulting in homogeneous recommendation results, which reduces users’ satisfaction. Diversity can not only effectively avoid over-fitting, but also comprehensively consider multiple dimensions to improve the quality of recommendation results. Therefore, we propose a content-based re-ranking method (CBR) for recommendation systems. The proposed method can make full use of the data set, and effectively supplement and re-rank the recommended results produced by some deep learning algorithms based on the edge information such as tags to be recommended from different perspectives, thus can effectively improve the diversity while preserving the accuracy of recommendation results. Experimental results demonstrate the significant improvements of the proposed re-ranking method.
Design and Implementation of Launching Subsystem of a Radar Parameter Measurement Simulation Training Platform
Authors: Wang Jun , Deng Bin , Li Chuanqi , Li Yiyuan 
Published: May 2020

Abstract
This paper introduces the design and implementation of the launch subsystem of a radar performance measurement simulation training platform. First, the main functions of the launch subsystem of the platform are determined according to the training requirements of the outline for measuring the radar performance parameters of the troops, including test items and technical indicators; then, comb the launch subsystem analog circuit of work process; finally, the design method of each functional circuit is introduced in detail. The practical application results are given. The launch subsystem of the simulation training platform can realistically simulate the performance parameter measurement training of the radar real launch subsystem. In addition, it can compare the feedback measurement results with the designed indexes, meet the training requirements of radar equipment support personnel, and increase the means of training and integration. Ensuring training time and enhancing support capability can effectively solve the problems of too many personnel and planes and equipment damage in actual training.
Numerical Simulation of the Plane Electromagnetic Wave Transient Propagation in Lossy Medium
Authors: Gao Li , Li Mingjun , Liu Feng , Zhang Lulu 
Published: May 2020

Abstract
In the field of geophysical exploration, it is of great value to study the transient propagation characteristics of electromagnetic waves in lossy medium. The equations of electric field and magnetic field are derived. The absorbing boundary conditions and numerical stability conditions are analyzed. The two-layer medium model is established to simulate the propagation characteristics of plane waves. The simulation results show that the transient analysis of electromagnetic wave propagation can reflect the time fluctuation characteristics of electromagnetic field in multilayer media, and provide the indication of the boundary position.
A Reconstructing Minimization Approach for Total Variation Based Transient Electromagnetic Inversion
Authors: Rao Liting 
Published: May 2020

Abstract
Transient electromagnetic (TEM) data are conveniently inverted to visualized underground structure with the widely used Occam’s inversion. However, in sedimentary environments, Occam’s inversion performs poorly in reproducing the sharp boundaries. This issue can be overcome by adopting total variation (TV) regularization. The existing computational methods for TV-based regularization are more complex than Occam’s inversion, which limits the application of TV-based regularization in TEM inversion. Here, we develop a reconstructing minimization (RM) approach for TV-based transient electromagnetic inversion. The TV stabilizer is reconstructed as the weighted squared L2-norm of a kernel function. The obtained iterative model update expression of TV-based inversion is extremely close to that of Occam’s inversion, which is rather simple to implement. Synthetic examples validate the efficiency and accuracy of the proposed RM approach.
Analysis of Key Security Technologies for Power Dispatch Control System of Power Dispatch Support System
Authors: Siming Zhou , Guanqiang Liu , Hai Qin , Tian Xia 
Published: May 2020

Abstract
The scale of China’s power grid is continuously expanding, the amount of collected data is increasing rapidly, and data processing and analysis services are developing towards clustering. Therefore, at present, task management in a stand-alone mode faces severe challenges in ensuring the high efficiency and reliability of distributed tasks. Information security risks in cyberspace can cause fatal threats to smart grid entities through the destruction of grid dispatching control systems and communication networks. Security check is one of the application functions of intelligent power dispatching control system. It is an important security defense line to ensure the stable operation of power grid and provides security check service for power grid dispatching plan and power grid operation. The existing operation and maintenance management mode of the power grid dispatching control system is distributed, and the data of each system and unit is not effectively integrated and connected, and lacks overall consideration. Based on the development history of power grid dispatching automation, this paper comprehensively analyzes the current status of the overall structure of the power grid dispatching system, and summarizes the key technology innovations and application effects.
Research on Application of Digital Signal Processing Technology in Communication
Authors: Lu Huang , Xiaoyu Yuan , Haodong Wang , Jin Li , Xuejiao Ma , Caihong Zhang 
Published: May 2020

Abstract
With the continuous development of modern information technology and the continuous improvement of people’s living standards, electronic information technology has been widely used in people’s lives. People’s lives are inseparable from it. With its continuous development, its application range is getting wider and wider. This article first gives a brief overview of digital signal processing technology, analyzes the advantages and disadvantages of digital signal processing technology in the communication field, and the specific applications of speech compression coding and software radio in communication are analyzed in order to better promote the application of digital signal processing technology in the communication field.
Research on WT-SVD Bilayer Filter Denoising for Downhole Signal
Authors: Yang Yuyan , Huo Aiqing , Qi Feng 
Published: May 2020

Abstract
Aiming at the problem of singularity and mutation points after wavelet denoising with improved layered threshold when denoising the downlink signal received in the downhole in rotary steering drilling, a bilayer filtering denoising method based on singular value decomposition is proposed. This method combines wavelet denoising and singular value decomposition denoising, and adopts the WT-SVD bilayer filtering denoising method to construct a matrix of the wavelet improved layered threshold denoising signal, and then performs singular value decomposition and recovery on the matrix signal. The number of selected singular values and the structure of the reconstruction matrix were determined through experiments, and the signal waveforms, signal-to-noise ratio, root mean square error and correlation coefficients of three different denoising methods including singular value decomposition, wavelet improved layered threshold and WT-SVD bilayer filtering are compared and studied. The final experimental results show that the WT-SVD bilayer filtering denoising method is effective.
Research on characteristic parameters of acoustic actuator radiation plate
Authors: Li Zhouli , Qian Cailing , Shi Kaikai 
Published: May 2020

Abstract
As the final output element of the magnetostrictive actuator, the material, size and shape selected by the radiant plate will affect the output efficiency of the actuator directly. Based on the theoretical analysis on natural frequency of thin circular plate and thick circular plate with peripheral fixing-supported, the result shows that the ratio of the thickness of circular plate to the square of its radius can be determined by material and vibration mode of the circular plate, and in portion to its natural frequency . when frequency of circular plate and circular plate vibration mode shapes are selected, the ratio of the thickness to the area of the circular plate is constant, which provides the basis for acoustic actuator radiation plate geometric design.
Research on Design and Control of Dual-Energy Source System for Pure Electric Vehicle
Authors: Min Wei 
Published: May 2020

Abstract
Based on the analysis of the structure of dual-energy source storage system and the requirements of drive motor for the power of the battery and super capacitor under different operating conditions, and according to the motor’s required power and the battery and super capacitor’s SOC (State of Charge) and other parameters, a corresponding distribution fuzzy control strategy of dual-energy source power is established. A complete electric vehicle model of a dual-energy source pure electric vehicle driven by a DC (Direct Current) motor is constructed by Matlab. The system simulation results show that the battery-super capacitor dual-energy source system can simultaneously meet the dual requirements of energy and power of the pure electric vehicle. Both the economy and power have been improved. Compared with the single-battery power supply of pure electric vehicles, the electric motor drive system of pure electric vehicles with dual-energy sources is more efficient. And the mileage for a single continuous charge, the maximum speed, the shortest acceleration time of 50 km/h and maximum gradeability of 50km/h are improved. The mileage increases by 32.4%. At the same time, the charge and discharge current and temperature of the battery are significantly reduced, and the service life of the battery is effectively.
Symmetry detection algorithm to detect forwarded spoofing interference signals of BOC modulation receivers
Authors: Wang Zhiying , Liu Yucen , Wang Menglan 
Published: May 2020

Abstract
In this paper, the symmetry detection algorithm based on the symmetry of binary offset carrier (BOC) modulation signals is proposed to solve the problem of the global navigation satellite system (GNSS) spoofing interference in BOC modulation and acquisition phase which set on the base of the characters of correlation peaks, and achieve the detection of the forwarded spoofing interference signals. The theoretical value and the simulation value of the receiver operating characteristic (ROC) curve of the symmetry detection algorithm can be obtained by the numerical calculation and the experimental simulation. It can be seen from the simulation that with the increase of the accumulation times after the correlation, the signal to noise ratio (SNR) of the spoofing signal compared to the real signal, and the SNR of the real signal, the detection probability of the spoofing signal increases as well. When the power of the spoofing signal is 3 dB greater than that of the real signal, the detection probability can be more than 99% under the condition that the false alarm probability is 0.1%. Given that it only needs to add the module to the software receiver to detect spoofing signals, the algorithm proposed in this paper is of practical significance.
The effect of silica fume inclusion on the properties of recycled concrete aggregate- containing concrete
Authors: Akpinar P , Al Attar H M E 
Published: May 2020

Abstract
Protecting the environment against the hazards of construction and demolishing (C&D) wastes is crucial. Elimination of C&D wastes by using them as recycled concrete aggregates (RCA) within the manufacture of new concretes is a promising solution for this problem. Since RCA coming from demolished structures have poor qualities, overall performance of new concrete should be monitored carefully. Without achieving a satisfactory strength performance, manufacturing concretes with RCA could not be widely accepted in construction sector. This study investigates the effects of silica fume, which is an effective pozzolanic material, on the properties of concrete mixtures made with 50%RCA as a replacement to quarried aggregates. RCA used was obtained from a 25-years old public building in Nicosia that was structurally failed and demolished. Results obtained indicated a 12.3% water demand increase for obtaining the targeted slump when SF was added in fresh concrete. The increase in compressive strength of concrete with SF in 28 days was 1.5%, where this increase was recorded as 8.1% at 90 days, yielding more than 65MPa strength. Also, addition of SF was observed to improve flexural strength of concrete samples up to a 4.3% at the age of 28 days, enabling the manufacture concrete mixtures apt for structural use.
Coal ash use as a cement replacement in concrete production
Authors: Bostanci S C 
Published: May 2020

Abstract
Ordinary Portland cement (OPC) is the main contributor of concrete CO2 emissions amongst concrete constituents. Use of alternative cementitious materials is highly encouraged to lower environmental footprint of concrete production. Local waste materials could be a feasible approach in terms of economic and environmental sustainability due to local availability. In this study, coal ash waste was used as a Portland cement replacement by 10% and 20% for the production concrete mix concrete mix with 28-day design strength of 45 N/mm2. Developed mixes were tested against various engineering properties including workability, bulk density, compressive strength, sound permeability, thermal conductivity, water permeability and porosity. Results showed that coal ash incorporated mixes had slightly lower slump values with slightly lower fresh density. Hardened properties including bulk density and compressive cube strength were reduced slightly for CA mixes. Other hardened properties showed that CA mixes had more compact structures compared to conventional mix. Therefore, CA mixes showed enhanced sound permeability, thermal conductivity, water permeability and porosity.