bluuebunny/crossref_metadata_2025 huggingface dataset:
Energy profiling of end-users in service and industry sectors with use of Complex Network Analysis
Authors: Portera Rosario , Bonacina Fabrizio , Corsini Alessandro , Miele Eric Stefan , Ricciardi Celsi Lorenzo
Published: October 2021

Decarbonization scenarios advocate the transformation of energy systems to a decentralized grid of prosumers. However, in heterogeneous energy systems, profiling of end-users is still to be investigated. As a matter of fact, the knowledge of electrical load dynamics is instrumental to the system efficiency and the optimization of energy dispatch strategies. Recently, a number of clustering algorithms have been proposed to group load diagrams with similar shapes, generating typical profiles. To this end, conventional clustering algorithms are unable to capture the temporal dynamics and sequential relationships among data. This circumstance is of paramount importance in the service and industrial sectors where energy consumption trends over time are possibly non-stationary. In this paper, we aim to reconstruct the annual user energy profile identified through a non-conventional method which combines a time series clustering algorithm, namely K-Means with Dynamic Time Warping, with Complex Network Analysis. For the purpose of the present research, we have used an open database containing the data of 100 commercial and industrial consumers, collected every 5 minutes over a year. From the results, it is possible to identify different patterns of consumer behaviour and similar corporate profiles without any prior knowledge of the raw data.
Experimental analysis of the unsteady flow inside a Wells turbine
Authors: Licheri Fabio , Puddu Pierpaolo , Ghisu Tiziano , Cambuli Francesco
Published: October 2021

One of the most promising technologies for sea-wave energy conversion is the one based on the Oscillating Water Column (OWC) principle. The system is composed of two units, an open chamber that converts the sea water motion into an alternating air-flow, and a turbine driven by the latter. The alternating flow of air requires a turbine capable of maintaining the same direction of rotation. The Wells turbine represents the simplest and most reliable device for this purpose. It is a self-rectifying axial turbine characterized by a rotor with symmetric blades staggered at 90 degrees relative to the axis of rotation. The vast majority of experimental works on Wells turbines and OWC devices analyzed their performance from a global point of view, often under steady conditions, in order to evaluate the pressure drop through the rotor, the torque produced and thus the turbine efficiency. This paper presents an experimental analysis of the three-dimensional flow inside a Wells turbine which operates in a facility capable of reproducing the alternating air-flow typical of an OWC system. The investigation is based on local flow measurements using several probes in order to describe the non-stationary air-flow, both up- and down-stream of the rotor at different heights, along the span of the blade. The investigation, conducted on a high-solidity turbine, details the behavior of the flow field inside the machine, aiming to provide a detailed description that can guide the aerodynamic optimization of the entire system (chamber and turbine) for a better energy conversion.
Grinder Injury of the Hand: A Rare but Devastating Occupational Hazard
Authors: Patial Tushar , Mittal Rajinder K. , Garg Ramneesh , Shah Sheerin , Kaur Amandeep
Published: October 2021

Food handlers and workers are exposed to several occupational hazards not frequented by the general population. Grinder injuries of the hand present a devastating consequence of industrial food processing that is infrequently described. Herein, we describe two cases that presented to our department with meat grinder injuries of the hand.
Towards energy policy corporatism in Central and Eastern Europe?
Authors: Horváthová Brigitte , Dobbins Michael , Labanino Rafael Pablo
Published: October 2021

This paper contributes to our understanding of interest intermediation structures in Central and Eastern Europe (CEE) and, specifically, whether, which, how and to what extent organized interests are incorporated into policy-making processes. Unlike previous studies primarily focusing on patterns of economic coordination (Jahn 2016), we focus on energy policy-making in the Czech Republic, Hungary, Poland and Slovenia. We address the extent to which these energy interest intermediation systems are gravitating towards a more corporatist policy-making paradigm and whether corporatist arrangements have been dismantled in view of the new wave of national conservatism in CEE. We offer a complex operationalization of corporatism based on concrete indicators and present the results of a survey of energy interest groups operating in the region. It covers questions regarding interest intermediation between the organized interests and the government, regulatory authorities as well as the degree of policy coordination and political exchange with the state and between rivalling organizations, enabling us to derive a “corporatism score” for each national institutional setting and discuss them in the light of Jahn’s (2016) corporatism rankings for the region. We show that—despite striking differences—at least rudimentary corporatist interest intermediation structures have emerged with some variations of pluralism and statism in all four countries.
A 3D passive micromixer with particle of stochastic motion through limonene dissolution method
Authors: Wang Junyao , Li Yunpeng , Liu Huan , Sun Gongchen , Chen Xingyu , Lang Tianhong , Wang Rui , Cui Bowen , Yuan Hengyi
Published: October 2021

A 3D passive micromixer with particles of stochastic motion is presented. 3D printing technology and computer numerical control milling technology are employed to manufacture the channel mold with the material of high impact polystyrene. Furthermore, a limonene dissolution method is utilized to dissolve the channel mold. The experimental results demonstrated that the mixing efficiency of the micromixer first increases and then decreases with the increase in the number of particles. Specifically, the mixing efficiency of the micromixer with two cube particles reaches 0.95 with the optimal particle size of 1.5 × 1.5 × 1.5 mm3. In addition, the larger the flow velocity is, the higher the mixing efficiency of the micromixer is. When the flow velocity reaches 1.0 ml/min, the mixing efficiency of the micromixer exceeds 0.9. Compared with the previous micromixers, a 3D passive micromixer with particles of stochastic motion has the advantages of simple manufacturing and no external power. This article is of great significance to the research of micromixers.
Partial substitution of barley with maize meal or flaked meal in bovine diets: effects on fatty acid and α-tocopherol concentration and the oxidative stability of beef under simulated retail display
Authors: Siphambili S. , Moloney A. P. , O’Riordan E. G. , McGee M. , Harrison S. M. , Monahan F. J.
Published: October 2021

Context Different cereal grain sources may be used in beef production but little is known about their effects on beef quality. Aims This study evaluated fatty acid composition, α-tocopherol concentration and oxidative stability of beef from bulls fed barley or a combination of barley and either ground or toasted flaked maize. Methods Fatty acid composition, α-tocopherol concentration, lipid oxidation and colour stability were measured in beef from late maturing bulls finished on a barley-based concentrate (BC) or on the concentrate with barley partially replaced by either maize meal (MM) or flaked meal (FM). Samples of M. longissimus thoracis were subjected to simulated retail display (4°C) for 3, 7, 10 and 14 days in modified atmosphere packs (O2:CO2; 80:20). Muscle was analysed for fatty acid and α-tocopherol concentrations, colour stability and lipid oxidation. Key results There were differences in the fatty acid concentrations. Total fatty acids, monounsaturated fatty acids and saturated fatty acids were higher (P < 0.05) in muscle from BC compared to FM bulls but neither were different to MM bulls. A decrease (P < 0.05) in concentration following display was observed across all treatments for α-tocopherol, C15:1, C18:2 n-6c, C18:3 n-3, C20:3 n-6, C20:4 n-6, C22:2, C20:5 n-3, C22:5 n-3, C22:6 n-3, total polyunsaturated fatty acids (PUFA), n-6 PUFA, n-3 PUFA and highly peroxidisable PUFA. Lipid oxidation in muscle was higher (P < 0.01) in muscle of FM compared to MM bulls after 14 days of refrigerated storage but neither were different to BC bulls. There was no difference (P > 0.05) in colour stability of muscle due to dietary treatment. Conclusions Partial replacement of barley with maize in the diet of bulls influences muscle fatty acid concentration and profile, leading to a marginal increase in lipid oxidation with no detrimental effect on colour stability. Implications Toasted-flaked or ground maize may partially substitute for rolled barley in a concentrate ration without affecting colour stability of meat under retail display conditions. The slight increase in lipid oxidation, after prolonged storage, in beef from bulls fed flaked toasted maize is unlikely to be of significance from a product acceptability perspective.
A language-matching model to improve equity and efficiency of COVID-19 contact tracing
Authors: Lu Lisa , Anderson Benjamin , Ha Raymond , D’Agostino Alexis , Rudman Sarah L. , Ouyang Derek , Ho Daniel E.
Published: October 2021

Significance

Language discordance has been shown to contribute to social disparities in healthcare. Contact tracing is essential to combating COVID-19, but language differences between contact tracers and patients have hindered its efficacy. We demonstrate a general method for leveraging machine learning and administrative data to maximize the impact of bilingual contact tracers and level language differences. We evaluate in a randomized controlled trial the impact of language matching on high-volume contact tracing in Santa Clara County, CA, and show that it reduces time spent and improves engagement with contact tracers. These results illustrate the advantages of utilizing bilingual personnel over third-party interpreters in improving social services.
Control of radiation-driven tearing mode by externally driven current in tokamaks
Authors: Xu Hai-Wen , Song Yuan-Hong , Ma Zhi-Wei , Wang You-Nian
Published: October 2021

The radiation-driven tearing mode (RTM) in tokamaks was numerically studied in our previous investigation (Xu et al 2020 Plasma Phys. Control. Fusion
62 105009), and it was noticed that radiation cooling could drive magnetic island growth and could even cause disruption due to the nonlinear mode coupling. In this work, the suppression of the radiation-driven

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tearing mode by an externally driven current is investigated numerically by using a three-dimensional toroidal code CLT (Ci-Liu-Ti means magnetohydrodynamics in Chinese) based on a full set of resistive magnetohydrodynamic equations. It is found that an externally driven current with appropriate turn-on time and strength can effectively stabilize the RTM. The effects of the asymmetry current and multi-mode coupling can be stabilized effectively by the externally driven current. In the nonlinear stage, under the influence of the radiation, a strong

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mode is generated due to the hot-core shift caused by the decrease of the core thermal pressure, which is irreversible even if the

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magnetic island could be effectively controlled by the externally driven current. When the externally driven current is turned on in the linear stage, it very efficiently and quickly suppresses the dominant modes, and the hot-core shift effect also becomes weaker because of the smaller

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mode. Moreover, it is found that external auxiliary heating with appropriate intensity in the core region can effectively balance the reduced pressure and can further control the hot-core shift caused by radiative cooling.
Iterative technique for a beam lying on a transversely isotropic foundation
Authors: Yue F , Wu Z Y
Published: October 2021

The effect of the foundation heterogeneity on the mechanical behaviour of a beam on Vlasov soils is discussed. According to a refined Vlasov soil model, the static problem of beams lying on transversely isotropic soils can be solved by an iterative method. In this paper, based on the energy variational principle, the differential equations for beams under an axial force on refined Vlasov foundations are derived. The methods for solving the internal forces and deformations of beams lying on refined elastic foundations are given. Additionally, an equation for the attenuation parameters is also established, and the characteristic parameters of the refined model are solved by iterative technique. Numerical results show that the foundation heterogeneity have a influence on the deformations and internal forces of the beam-soil system. Moreover, relatively accurate characteristic parameters can be obtained through the iterative process. The refined Vlasov model has broad application prospects.
Additive remanufacturing of coupler knuckle based on robotic gas metal arc welding
Authors: Wang F , Yin Z Q , Sun X H , Gong X D , Kou L , Zhan Z T , Ni X H , Yuan X J , Meng Y X , Liang G Q , Feng X C , Li X J , Gao J L
Published: October 2021

Take the wear parts of coupler knuckle as an example, the “Modeling—Slicing — Stacking” mode remanufacturing process is studied. First, the 3D model of the of the worn coupler knuckle surface is acquired by structured light 3D detection. The remanufacturing model of the failure part is built by Boolean operation between the original model and the acquired 3D model. Second, the user can slice layer of the remanufacturing model according to the remanufacturing stacking parameters. The zone that surrounded by the contour of each sliced layer is the robotic GMAW remanufacturing stack region. Third, the robotic GMAW remanufacturing path is planed within the region mentioned above and the executable program is generated to carry out the remanufacturing task layer by layer. Moreover, the worn coupler knuckle was repaired by adopting Robotic GMAW Process. The mechanical performances of component were tested, the results indicate that the remanufactured coupler knuckle satisfying the operating requirements.
Experimental Study on the Effect of C-PAM and A-PAM on Dewatering Performance of Waste Mud
Authors: Du C L , Peng M G , Li Z W , Zhou S X , Ren L Z , Duan J C , He M X , Wang M
Published: October 2021

Abstract:In order to improve the treatment capacity of waste mud, C-PAM and A-PAM were used to treat waste mud in this paper. The effects of C-PAM and A-PAM on the flocculation effect of waste mud were discussed. The key mechanisms of C-PAM and A-PAM on the flocculation of waste mud were deeply analyzed by analyzing the variation characteristics of particle size distribution, water content of filter cake, Zeta potential of supernatant and turbidity of supernatant during the treatment process. The results showed that the flocculation effect was the best when the dosages of C-PAM and A-PAM were 140 mL (2%) and 30 mL (2%), respectively. The adsorption bridging of C-PAM and A-PAM plays a leading role in the treatment of waste mud, but the electric neutralization is not obvious. This research can reduce the amount of waste mud and has practical significance.
The Release of C-14 of HTR Graphite Spheres during High Temperature Oxidation
Authors: Chen X , Liu B , Wang T , Xu G , Zhang L , Mao C , Xiao H , Shao Y , Zhao H , He L , Yin Z
Published: October 2021

As the key components of the HTGR fuel, the intact TRISO-coated particles contain almost all fission products under the normal and accident conditions in the reactor. On the other hand, the high temperature oxidation of irradiated fuel pebbles is one of feasible processing methods for HTR spent fuel pebbles. The knowledge of the C-14 release from irradiated fuels and the migration behavior during high temperature oxidation is of great importance for the post-irradiation examinations (PIE) and long-term storage and reprocessing of HTR-PM fuel pebbles. In this work, the C-14 release behavior from one irradiated HTR graphite sphere, which was used as a substitute for a irradiated HTR fuel, was determined by out-of-pile examination. The irradiated HTR fuel was oxidized in the hot lab of INET, and the substantial migration of fission products from graphite matrix was adsorbed and systematically studied by γ-scanning. Specifically, the C-14 release during oxidation was analyzed and illustrated. This work will provide theory and experiment basement for spent fuel disposal of HTGR, as well as a new sample preparation method for C-14 measurement by liquid scintillation counter (LSC).
Release Rates of Short-lived Fission Gases from Modern Spherical Fuel Elements with TRISO-coated Particles
Authors: Verfondern K , Liu B , Nabielek H , Wang T , Allelein H J , Tang C H
Published: October 2021

Measurement and prediction of fission product release is important in design, licensing and operation of HTRs. Latest development status is near zero particle manufacturing defects and in-pile failures combined with very low matrix contamination levels. In-pile Release over Birth rate measurements will be described and evaluated. Quantitative predictive analyses of short-lived gas release will be provided for MTR irradiation testing with a focus on the most recent experiment with Chinese fuel from HTR-PM production. For irradiation tests with no single particle failure, models describing particle kernel release are not applicable; instead modeling of matrix contamination release is essential. Good agreement between post calculations and in-line R/B measurements has been achieved.
R&D on Surrogate Kernel Fabrication in Support of Reaktor Daya Eksperimental (RDE) Project
Authors: Sarjono  , Riyanto S , Mutiara E , Yusnitha E , Yulianto T , Langenati R , Sumaryanto A
Published: October 2021

R&D program on HTGR fuel to support the RDE project has been outlined and is aimed to develop national capabilities on nuclear fuel technology. The external sol-gel technology has been adopted for the fabrication of kernels. Laboratory scale work has been ongoing at the Center for Nuclear Fuel Technology (PTBBN) BATAN to study various parameters involved in the process of kernel fabrication including tuning of parameters related to droplet formation (feed flow rate, vibrator frequency, NH3 gas flow rate), optimizing chemical formulation in broth preparation, various treatments in aging, washing, drying process, and thermal treatment for densification of kernels. In this early stage, zirconium precursors were used to manufacture surrogate kernels of ytrria-stabilized zirconia. The steps for kernel fabrication include chemical formulation of broth and droplet casting, aging-washing-drying of gel microspheres, calcination and sintering, and characterization of sintered kernels (surface morphology, density, diameter/sphericity, solid phase). Stable cast of droplets from 1 mm nozzle diameter was optimized by adjusting feed flowrate at 30 ml/min, viscosity at 45-60 cP, and vibrating frequency at 100 Hz. Presolidification of gel skin was optimized at a working NH3 flow rate of 3.5 - 4 L/min. Addition of urea with mole ratio urea/metal 2.5/1.0 gave the most preferable results based on SEM examination for crack and morphological structure. Control the opaqueness of the sol can be done by portioning addition of urea, where a portion of urea was added at decomposing temperature around 85°C, while another portion was added at a lower temperature. Addition of urea has a desirable effect on crack reduction during heat treatment of gel microspheres. Increase in metal concentration results in an increase in kernel diameter when other sol-to-gel conversion parameters were kept unvaried. Phase determination by X-Ray Diffractometer indicates that solid phase for ceria-stabilized zirconia prepared with precursor composition of 16% yttrium in zirconium-yttrium sol results in yttria-stabilized zirconia 8YSZ with cubic phase.
Study on the Implementation of Quality Assurance Aspect on High-Temperature Gas Cooled Reactor (HTGR)
Authors: Sunarto  , Santosa Sigit , Khotimah Khusnul , Sriyana
Published: October 2021

High-Temperature Gas Cooled Reactor (HTGR) Power Reactors have a layered safety system with the concept of a double barrier system. However, quality assurance is required to ensure the fulfillment of technological analysis weightings on power chamber materials, power ratings, fabrication components of High- Temperature Gas Cooled Reactor (HTGR) fuel elements, primary and secondary coolant pressures to meet customer requirements and be carried out continuously systematic and objective. This study analyzes the application of quality assurance, safety, security, the correctness of test/calibration results, increasing competitiveness, consumer protection and building trust (brand image) in the use of HTGR reactors to provide a reliable level of safety and security. The study method used is based on the literature review. The output of this study is the document of the HTGR reactor quality assurance systems to fulfill the IAEA-TECDOC-1645 requirements according to safety and standardization in frameworks design, material, fuel, and physical properties of the quality management systems. HTGR reactor has technical qualification, good performance of HTGR fuel, safety and accident analysis source term analysis, control of multi-modular HTGR and related human factor analysis, also optimizing radiation protection of HTGR
Study on the Curved Channel Model in the Initial Core Loading of Pebble Bed High Temperature Reactors
Authors: Xia B , Zhang J , Guo J , Wei C , Li Fu
Published: October 2021

Continuous on-line fuel cycling is the essential feature of the pebble bed high temperature reactor (PB-HTR). The flow speed of the fuel pebbles in a PB-HTR presents a radial distribution in the reactor core, mainly due to the friction between the pebbles and the wall and the conical structure at the core bottom. In the VSOP fuel shuffling model, the simulation of unequal pebble flow speed is achieved by dividing the reactor core into some vertical flow channels with different numbers of the equal-volume regions in each channel. However, the fuel shuffling with equal-volume batches bring complexity when dealing with the change of fuel composition, such as the fuel fraction of fuel-graphite pebble mixture, during the initial core loading and early running-in phase. In this work, a curved channel model with unequal flow speed and the bottom cone is established based on the DEM simulation of pebble flow in the HTR-PM. The batch-wise fuel shuffling strategy is adapted to fit the complex situation during mixing and re-assigning the discharged fuels by employing a rounding strategy for the actual volume of fuels with similar irradiation history. The key of the adapted strategy is to divide the total number of the mixed batches with similar irradiation history by the number of flow channels, and round the quotient as the number of reloaded batches in each top region. The fuel loading process to build up the initial core, accompanied by the low-power reactor running to compensate the reactivity provided by the fresh fuels, is simulated by using the fuel shuffling model mentioned above. On the other hand, the simulation on the same process with an effective cylindrical core mesh and straight flow channels is carried out, in which dividing and rounding the batch numbers are unneeded. The results of both models are compared, indicating that the curved channel model presents less core reactivity and shorter fuel loading period than those of the cylindrical model. From the point of view of fidelity, the former is more suitable for the simulation of initial core loading process. The results in this work are important for enhancing the economy of fuel cycling of PB-HTRs.
Multi-group cross section library generation for HTGR lattice physics code XPZ
Authors: Zhang Lerui , She Ding , Shi Lei , Chambon Richard , Hébert Alain
Published: October 2021

The XPZ code was previously developed for the lattice physics computation in High Temperature Gas-cooled Reactors (HTGRs), which adopted the multi-group cross section library converted from the existing open-source DRAGON library. In this paper, a new format of multi-group cross section library named XPZLIB has been implemented in XPZ code. XPZLIB is designed in binary and HDF5 formats, including detailed data contents for resonance, transport and depletion calculations. A new data-processing module named XPZR is developed based on NJOY-2016 to generate nuclide dependent XPZLIB from the most recent evaluated nuclear data, and besides, the PyNjoy-2016 system is developed for automatic generation of integrated XPZLIB including a complete set of nuclides. The new generated XPZLIB is presented with the XPZ code. Numerical results demonstrate the accuracy of the new library XPZLIB and the reliability of the data processing scheme. Moreover, the influence of different versions of ENDF/B data is investigated.
Shear Wave Velocity (Vs) at Reactor Building, Experimental Power Reactor Indonesia
Authors: Iswanto Eko Rudi , Ryanto Theo Alvin , Setiaji Abimanyu BW , Suntoko Hadi
Published: October 2021

Experimental Power Reactor (RDE) is a Gen IV Reactor type with Hydrogen Gas Cooler. Despite this type of reactor has high safety performance, earthquake hazard should be demonstrated. Detail Engineering Design Activity on RDE has been conducted in the past 3 years. In the end of this phase, preliminary parameter design such as shear wave velocity (Vs) should be defined. This parameter correlated with subsurface condition which has high uncertainty. This study is conducted in order to estimate values of Vs. Generally, the data collection is carried out through geotechnical investigation but this method cost more time and resources. In the recent decades, another method has been widely introduced which is geophysical passive source Microtremor Array Measurement (MAM) with Spatial Auto Correlation (SPAC) method. This method can be used to estimate values of Vs and can be used as preliminary reference to define the position of borehole before construction phase getting started. The result shows, the location of reactor building is estimated to have 5 soil layers with varying Vs value. The Vs value of the first soil layer is about 152 m/s started from the surface to 8 m depth. The second soil layer has 169 m/s Vs value started from 8 m to 20 m depth. The third soil layer, started from 20 m to 36 m depth, has 384 m/s Vs value. The next layer as the fourth layer of soil, started from 36 m to 70 m depth with a value of Vs around 526 m/s. The last soil layer with a depth 70 m to 100 m, has Vs value of 667 m/s. Based on these Vs value estimation from surface to 30 m depth, the average value of the shear wave velocity (Vs
30) is m/s. Thus, reactor building is located in the site class SD with medium soil categories according to SNI 1726-2012. The foundation design and excavation planning phase, this information is needed.
Study on the DLOFC accident of the GEMINI+ conceptual design of HTGR reactor with MELCOR and SPECTRA
Authors: Skrzypek M , Skrzypek E , Stempniewicz M , Malesa J
Published: October 2021

The work presented in this paper was performed within the Euratom Horizon 2020 GEMINI Plus project. Behavior of the HTGR reactor under severe accident conditions was investigated and the maximum fuel temperature was observed. Due to application of the TRISO particles and SiC layers in the fuel element, no damage of the fuel is expected up to 1600°C. Under the cooperation in the project between Nuclear Research Group (NRG) and National Centre for Nuclear Research (NCBJ) a code-to-code calculations were carried out between the SPECTRA and MELCOR codes. SPECTRA code, developed by the NRG is a thermal hydraulic analysis code and MELCOR 2.1.6342 used by NCBJ developed by SANDIA National Laboratory is fast running severe accident code. Both codes have already HTGR specific models build in. The following accident was analyzed and will be presented: Depressurized Loss of Forced Circulation (DLOFC) with 65 mm break at the top of reactor vessel. The scenario was calculated applying following sets of assumptions: best estimate and conservative. Plant behavior was analyzed including primary and secondary side of the reactor. As the results of applying conservative assumptions, it was found that fuel temperature excides the acceptable limit of 1620°C. Therefore, changes in the core design were proposed by project participants. Analyses of the new core showed acceptable temperatures. In the paper the results of code-to-code comparison are presented. Both codes have shown a good agreement of presented following characteristics on maximum fuel temperature, relative power and Reactor Cavity Cooling System power, primary pressure and break flow.
Latency Aware Distributed ADMM over Networks
Authors: Zeng Shuai , Wang Shuangsheng , He Yiming
Published: October 2021

Methods based on the alternating direction method of multipliers (ADMM) has attracted academic attention because of its excellent convergence performance and potential application scenarios in many machine learning or optimization fields. However, classical distributed ADMM algorithm assumed ideal network communication, which do not consider the impact of network delay on computing performance. In this paper, based on the strategy of selecting bridges with lowest network latency and appropriate iterative process, we propose a latency aware distributed ADMM algorithm to alleviate the impact of network delay. The classical algorithm and proposed algorithm are tested and compared in real network scenarios. Experiments show that the proposed algorithm reduces the running time and improves the computing performance. Especially in networks with large delay, the effect is more obvious.
Latent Topic Analysis of the Post Property for Sales to Predict a Selling Price of Second-Hand Condominiums
Authors: Chaiwuttisak Pornpimol
Published: October 2021

This research objective is to study the latent topics analysis in selling post of real estate of second-hand condominium by using Latent Dirichlet Allocation (LDA) and build a price prediction model of second-hand condominium using multiple linear regression and artificial neural networks by measuring and comparing the performance of the second hand condominium price prediction model with root mean square error (RMSE). This experiment included four variables are room size, number of bathroom, number of bedroom and latent topics from LDA. The result of LDA indicated that selling post of real estate can be separated into 4 topics, in which finding the factors that affect the price use the regression analysis method to get five variables are room size, number of bathroom, floors, topic 2 and topic 4. The RMSE based on the multiple linear regression analysis was 1.349, while the RMSE based on artificial neural network was 1.156. Thus, it can be concluded that the predictive model using the artificial neural networks is superior to multiple linear regression.
Design of Intelligent Security Management and Control System for a Large Nuclear Facility
Authors: Guo Ming , Wu Fei , Wang Mohan
Published: October 2021

There are many kinds of safety control sub-systems of a large nuclear facility, and their information is isolated from each other, so the overall safety control efficiency is low. To solve this problem, based on the original security control sub-system, an intelligent security management and control system is designed by using the technology of system integration and multi-sensor cooperative scheduling. Firstly, the web service interfaces of each security control sub-system are developed, and the interconnection and information sharing of each security control sub-system are realized through these interfaces. Then, based on the multi-sensor system cooperative optimization scheduling technology and the improved ant colony algorithm, the information synthesis and security cooperative optimization scheduling of heterogeneous multi-sensor messages are realized. The highly integrated intelligent security management and control system reduces the alarm omission rate and false alarm rate of the safety control and improves the efficiency of the security control.
The Reform Scheme of Fundamentals of Computer Culture based on Multi-level Blended Teaching
Authors: Yang Jiemin , Tan Meile , Du Gang , Li Ying , Fu Xiaoxue , Zhou Yi
Published: October 2021

As a general course for college students, Fundamentals of Computer Culture plays an important role in the training of professional talents. However, there is a large gap in the ability and quality of college students. In order to promote the creative teaching reform of this course and improve the theoretical and skill levels of college students, our college proposed a reform scheme of multi-layer blended teaching to realize an all-round reform of curriculum system, teaching content, teaching arrangement, teaching method and means, teaching assessment, etc. It also gives a detailed introduction to the reform plan and its implementation in the paper, and provides a creative solution for the teaching reform of the Fundamentals of Computer Culture in other universities, which has great practical value.
Control of Stochastic Nonlinear Switched Systems using Fuzzy Law
Authors: Yang Hong , Zhang Yu , Yang Chao , Zhang Le
Published: October 2021

The problem about controller design for stochastic nonlinear switched systems with delay is considered. Stochastic switched nonlinear system is a kind of nonlinear system which integrates switching and nonlinear fuzzy characteristics and can fully reflect stochastic factors. First, the mathematical model of stochastic nonlinear switched systems with time delay and disturbance is given. Second, the corresponding controller is designed for the proposed model. Then, we use the multi-Lyapunov method to establish the closed-loop system on the basis of our designed controller, and give the necessary and sufficient conditions for the stability of the system. The switching law is designed to ensure the stability of subsystems activated by switching time. Finally, through the simulation software, we can see that the stability condition we obtained can make the studied system stable.
An AUV Path Planner for Large-scale Search and Rescue based on A* Algorithm
Authors: Cai C , Chen J
Published: October 2021

For large-scale search and rescue (SAR) tasks that require complete coverage of the workspace, it is important to increase the efficiency and obtained sensor data quality. A novel path planner named SAR-A* to this problem is introduced, which takes into account the sensor performance and practical prior information. Firstly, the workspace is decomposed into plenty of hexagonal cells which are treated as waypoints for A* algorithm. Target present probability is then modeled to Gaussian distribution and the performance of the side-scan sonar (SSS) is evaluated. The proposed path planner is validated in a complex terrain scenario which proves that the SAR-A* path planner can increase confidence in locating the target quickly, and is suitable for the large-scale SAR.
Synthesis and characterisation of copper vanadate quantum dots / nanostructured zinc oxide
Authors: Wee W Q , Sim L C , Leong K H , Saravanan P
Published: October 2021

0D/3D heterojunction photocatalyst, specifically copper vanadate (CuVA) quantum dots (0D) / nanostructured zinc oxide (ZnO) (3D), has been prepared using in-situ reaction method. pH of 8 yielded the optimum nanostructure for the hydrothermal synthesis of ZnO nanorods. Characterisation of heterojunction photocatalysts obtained using Fourier transform infrared (FTIR) spectrometer, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis indicates that this method is effective for incorporating quantum dots (QDs) onto ZnO. FTIR at wavenumber 3537, 1360 and 734 cm−1 showed a decreasing transmission peak as the amount of CuVA increases with respect to ZnO. EDX had showed an increasing trend in copper and vanadium elemental percentage in CuVA-ZnO as the targeted CuVA loading increases. 30 wt% CuVA QDs loaded onto ZnO was found to be the optimal mass loading to degrade sulfadiazine (SDZ), at 17.01% with initial concentration of 10 mgL−1. This work is expected to provide a suitable alternative as a photocatalyst to degrade pollutants, with antibiotics being the focus of this work.
Coal-fired steam turbine power plant using oxygen-rich air as oxidizer
Authors: Komarov I I , Osipov S K , Shcherbatov I A , Makhmutov B A , Kaplanovich I B
Published: October 2021

Mitigation of harmful and greenhouse gas emissions produced by the coal combustion in thermal power plant is a topic goal. Reduction of the nitrogen oxides, sulfur and ash emissions makes remarkable progress but the carbon dioxide emission still meets considerable difficulties mostly caused by the low greenhouse gas content in the flue gas. A prospective solution to this problem may be the fuel combustion in oxygen-enriched air, which increases the flue gas carbon dioxide content. In this technology, the carbon dioxide content in flue gas is higher and this results in its easier capture. This paper presents the thermodynamic analysis results of a steam turbine power production facility that burns coal in the air with high oxygen content. The computer simulation shows that the oxygen content increase from 21 to 95.6% increases the carbon dioxide content in flue gas by a factor of 3.3 and lowers the power consumption for carbon dioxide capture by 11%. On the other side, the power consumption for pure oxygen production reduces the facility’s net efficiency from 28.54 to 21.59%.
Comparative analysis of the efficiency of using hydrogen and steam methane reforming storage at combined cycle gas turbine for cogeneration
Authors: Komarov I I , Rogalev A N , Kharlamova D M , Yu Naumov V , Shabalova S I
Published: October 2021

Combined cycle gas turbine cogeneration power plants provide maximal thermal efficiency. The facility thermal load depends upon ambient conditions and it may limit its unloading degree, or control range. Energy accumulation extends the control range by the energy storing during the power excess period and the energy discharge during the high consumption period. This paper considers two accumulation technologies, with the steam methane reforming and with hydrogen storage by using electrolyzer and fuel cell. In steam methane reforming technology a part of heat recovery steam generator steam passes to the synthetic gas production and reduces the electric power production during the low load periods. During the peak load periods, the synthetic gas is burned in combined cycle gas turbine and peak load gas turbine combustors. In hydrogen accumulation technology the excessive power produces hydrogen in an electrolyzer, which is stored and used during the peak load periods in fuel cells for additional electricity production. The simulation was carried out in the Aspen Plus software, the thermo-physical fluid properties were determined using the Peng-Robinson state equation. Application of the steam methane reforming accumulation technology increases the facility contribution margin by 2.6%, the hydrogen accumulation technology reduces this margin by 0.1%.
Field measurement of indoor environment of a room with single-sided sliding glass opening
Authors: Wellun Z , Mohammad Yusoff W F , Mohamed M F , Mat Sulaiman K A , Mohammad Rasani M R
Published: October 2021

The indoor environment of a room is also affected by the opening type and configuration. The application of an opening in a building is mainly influenced by its aesthetic look rather than its environmental performance. Understanding of an opening’s impact towards the indoor environment is essential. The impact of a single-sided sliding glass opening to the indoor environment of a room discussed using field measurement. A room located in a two-storey detached house was selected. Total of ten days from 7 a.m. to 7 p.m., the sliding glass was slid to one side to allow natural ventilation into the room, hence, a cavity was created in between the two glasses. The results of the study indicated that high heat accumulation was detected at the glass surface area which faced the cavity and the air velocity in the room was found to be lower than the outdoor wind speed. This study provides important findings on the performance of a single-sided sliding glass opening and how it impacts the indoor environment of a room then help the building owner, designer, and people in the built environment industry to further understand the performance of sliding glass openings.
Production and characterization of carbon nanotubes by methane decomposition over Ni–Fe/Al2O3 catalyst and its application as nanofillers in polypropylene matrix
Authors: Alcázar Hermann E , Chire Emilio , Vargas María M , Villagarcía Bryan L , Neira John , Contin Andre , Alcázar Leopoldo O
Published: October 2021

This paper studies the influence of metal precursors in the CVD´s catalyst synthesis of carbon nanotubes (CNTs) used as fillers in a polypropylene (PP) matrix (∼0.3 wt%). Two catalytic schemes, Fe/Al2O3 (50:50) and Ni–Fe/Al2O3 (40:10:50), were prepared to determine the influence of the reduction temperature over the characteristics and mechanical properties of CNT as PP fillers. The conversion temperature was varied to see the dependance of the CNT structure to this variable (700 °C–750 °C–800 °C). CNTs products were characterized by SEM and Raman spectroscopy. The SEM micrographs showed a sharper fiber type CNTs for the bimetallic catalyst and the Raman confirmed that better crystallites are obtain over the Fe catalyst. The Fe–PP composite presented enhanced mechanical properties when compare with Fe–Ni–PP, with tensile strength, hardness, and impact properties are higher in 16%, 9%, and 9% respectively. Other carbonaceous materials, as CNF, with less crystallinity presented poorer mechanical properties. Finally, can be stated that for the use of CNF as fillers in PP composites a Fe/Al2O3 catalyst, and a reaction temperature 700 °C–750 °C will produce a CNF with 60 nm mean diameter, is better than the use of Fe-Ni based catalysts.
Promoting energy sources as environmentally friendly: does it increase public acceptability?
Authors: Palomo-Vélez Gonzalo , Perlaviciute Goda , Contzen Nadja , Steg Linda
Published: October 2021

Environmental frames are widely used in an effort to increase public support for energy sources in the sustainable energy transition. Research suggests that environmental frames are most effective when they are congruent with people’s biospheric values. Yet, this value-congruence account has been mainly tested for promoting behaviors, policies or products that have clear environmental benefits. But what if they do not? For example, what if energy sources are promoted as green but are not seen as such by the public? We extend the value-congruence account by proposing that besides the congruence between the frames and biospheric values, it is important to consider how much the products themselves are congruent with environmental frames and biospheric values. We tested this novel value-frame-product account by evaluating the effectiveness of environmental frames (versus financial frames) on the acceptability of energy sources that are typically seen as high, moderate, and low in environmental friendliness, and depending on how strongly people endorse biospheric values. Overall, the results supported none of the congruence accounts, suggesting that matching frames (and products) with people’s values might be less effective in enhancing acceptability of products than previously thought. Instead, environmental framing increased the acceptability of all energy sources, independent of people’s biospheric values and the perceived environmental friendliness of those energy sources. Moreover, highly environmentally friendly energy sources were more acceptable and evaluated more positively, especially among people who strongly endorsed biospheric values. We discuss the theoretical and practical implications of our study.
Si nanoparticles seeded in carbon-coated Sn nanowires as an anode for high-energy and high-rate lithium-ion batteries
Authors: Ben Liubin , Zhou Jin , Ji Hongxiang , Yu Hailong , Zhao Wenwu , Huang Xuejie
Published: October 2021

High-capacity and high-rate anode materials are desperately desired for applications in the next generation lithium-ion batteries. Here, we report preparation of an anode showing a structure of Si nanoparticles wrapped inside Sn nanowires. This anode inherits the advantages of both Si and Sn, endowing lithiation/delithiation of Si nanoparticles inside the conducting networks of Sn nanowires. It demonstrates a high and reversible capacity of ∼1500 mAh g−1 over 300 cycles at 0.2 °C and a good rate capability (0.2 °C–5 °C) equivalent to Sn. The excellent cycling performance is attributed to the novel structure of the anode as well as the strong mechanical strength of the nanowires which is directly confirmed by in-situ lithiation and bending experiments.
Education as a moderator of middle-age cardiovascular risk factor—old-age cognition relationships: testing cognitive reserve hypothesis in epidemiological study
Authors: Iso-Markku Paula , Kaprio Jaakko , Lindgrén Noora , Rinne Juha O , Vuoksimaa Eero
Published: October 2021

Background

higher educational attainment and less midlife cardiovascular risk factors are related to better old-age cognition. Whether education moderates the association between cardiovascular risk factors and late-life cognition is not known. We studied if higher education provides resilience against the deteriorative effects of higher middle-age body mass index (BMI) and a combination of midlife cardiovascular risk factors on old-age cognition.

Methods

the study population is the older Finnish Twin Cohort (n = 4,051, mean age [standard deviation, SD] = 45.5 years [6.5]). Cardiovascular risk factors and education were studied at baseline with questionnaires in 1975, 1981 and/or 1990 (participation rates of 89, 84 and 77%, respectively). Cognition was evaluated with telephone interviews (participation rate 67%, mean age [SD] =73.4 [2.9] years, mean follow-up [SD] = 27.8 [6.0] years) in 1999–2017. We studied the main and interactive effects of education and BMI/dementia risk score on late-life cognition with linear regression analysis. The study design was formulated before the pre-defined analyses.

Results

years of education moderated the association between BMI with old-age cognition (among less educated persons, BMI-cognition association was stronger [B = −0.24 points per BMI unit, 95% CI −0.31, −0.18] than among more educated persons [B = −0.06 points per BMI unit, 95% CI −0.16, 0.03], Pinteraction < 0.01). There was a similar moderating effect of education on dementia risk score consisting of cardiovascular risk factors (P < 0.001).

Conclusions

our results support the cognitive reserve hypothesis. Those with higher education may tolerate the deteriorative effects of midlife cardiovascular risk factors on old-age cognition better than those with lower education.