bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Design of Multimedia Platform Based on Digital Campus
Authors: Wang Zhenyu , Huang Zichang , Sun Hao , Li Yongzhi , Lyu Jianhua
Published: March 2020

This research is designed for the future campus multimedia platform design, starting from the existing multimedia platform situation and the problems in daily teaching life, such as: multimedia platform materials are mostly made of alloy and heavy materials; the multimedia platform is inflexible, mostly square and single in form. The use of partitions is not clear enough, or the partitions do not conform to the usage habits, and chalk mouse boards are often rubbed together. The control panel buttons are scattered, inconvenient to operate and difficult to open under unfamiliar conditions. Observe users’ usage habits and make suggestions and investigations on users and surrounding personnel, and record the problems. After listing the problems, carefully analyze, select the most suitable one, analyze from the angle of man-machine design, and then proceed to design the solution. In the early research stage of this topic, the necessity of redefining the design of the campus multimedia platform was demonstrated. Through the analysis and positioning of the crowd, the analysis of the use environment and the use habits, problems were found. After analysis and synthesis, different sketch plans were put forward, and finally my own design plan was determined. According to the analysis of the existing multimedia platform, aiming at the problems of unclear division of the existing multimedia platform and the frequent mixing of chalk and the like, a future campus multimedia platform is redefined and designed. This multimedia platform is mainly based on the human-computer relationship. The main idea of the design is to try to be concise and easy to operate without affecting the work needs.
Quantification of graphene materials in fibers
Authors: Li Weidong , Wang Yingjie , Mao Zhiping
Published: March 2020

A method for quantitative determination of graphene materials in fibers by high temperature pyrolysis - element analysis is reported. This method takes advantage of the difference between the thermal stability of fiber and graphene itself to design the corresponding temperature gradient. Firstly, the fiber matrix is removed, and then the carbon element content ratio is measured by element analyzer. This method eliminates the influence of other impurities in the fiber. The experiment is reliable, simple to operate and the relative deviation conforms to the standard range, which is of great significance for quantitative analysis of the content of graphene materials in the fiber.
Simulation and Experiment of Stainless Steel - Carbon Steel Cladding Rebar Rolling
Authors: Wu Shen , Tan Jianping , Li Zhen , Xiang Yong
Published: March 2020

In this paper, ABAQUS is used to simulate the rolling process of stainless steel (304)-carbon steel (20MnSiV) clad rebar, and the metal flow law is analyzed. It was found that the K1 pass type has a great influence on the stress and strain distribution of the clad steel. The thickness of the stainless steel wall is thinned at the roots of the transverse and longitudinal ribs, and the thickness of the front end of the transverse rib root is thinner than the rear end along the rolling direction. The clad rebar rolling experiment was carried out to verify the simulation results.Then, the steel bars were subjected to tensile and bending tests, and the results showed that they have good mechanical properties. And the metallographic observation of the bonding layer proves that a good metallurgical bond between the two metals is achieved.
Analysis of load variation of two-pipe climbing robot under three gait conditions
Authors: Yi Weifeng , Tan Jianping
Published: March 2020

This paper presents a double-piped climbing robot, which is designed for the detection and maintenance of boiler pipes in coal-fired power plants. It studies the three gaits of climbing robots: crawl, reversal and torsion. This research has established a virtual prototype of the climbing robot. By using the simulation software, ADAMS, we analyze the clamping force of the robot’s mechanical arm, and also the changing conditions of the key motor’s torque during the climbing process. analysis the robot in the quality of external load change influence on robot driving moment, the result can be extended as a robot uses, optimize the robot structure as the basis, to ensure the stability and security of climbing performance.
Research on the Linkage Mechanism of Multi-Time Scale Electricity Market in Northern Hebei
Authors: Wei Zhongkang , Zhu Tianbo , Ning Bo , Zhong Xinrui , Zhang Tianyu
Published: March 2020

With the rapid marketization of the electric sector, transferring to market-oriented system from managed-based system is of utmost importance. As spot market constructing recognized as a necessity for electric reformation, Northern Hebei is treating the linkage mechanism seriously. Focusing on the spatial and temporal linkage mechanism for energy trading, this paper aims to discuss reasonable options for Northern Hebei when it’s introducing the spot market. The relationship between energy market and ancillary market, particularly in the spot market, is also discussed to better shape a comprehensive framework for the entire electric market. Some discussions on the specific electric commodity categories are demonstrated as well to help Northern Hebei look into the future and take strategies accordingly as the market develop and the government giving more guidance on the market construction.
Working Mechanism and Numerical Simulation of a Novel 6-DOF Robotic Crusher
Authors: Li Guoguang , Shi Boqiang , Liu Ruiyue , Gu Jie
Published: March 2020

Based on the inter-particle breakage theory and characteristics of oscillating motion, a novel 6-DOF robotic crusher is proposed which combines the chamber structure of the cone crusher with the high flexibility of the parallel robot. According to the method of analytical geometry, equations of the inverse and forward models are deduced. Then, considering the periodicity of eccentric rotation, the trajectory model of the oscillating motion is established by using an eccentric simulation. Based on the derived model, the motion variation of the actuators can be solved by ADAMS. Finally, the liner wear of the concave is deduced by a numerical example which can provide a theoretical foundation for the development of the intelligent crusher.
The Research of Embedded Remote Monitoring System Based on B/S Framework
Authors: Cheng Xiaoyan , Dang Guoqing
Published: March 2020

With the continuous development of industrial automation, the requirement of monitoring system in industrial field is higher and higher. Various advanced computer technology, sensing technology and communication technology are more and more appearing in industrial field. Touch screen or computer are usually used to realize the visual monitoring of industrial production line. This monitoring system based on C/S mode is widely used. With its advantages, the monitoring system based on B/S mode is gradually applied to smart home, telemedicine, agriculture, power system and other occasions. The monitoring system based on B/S mode has more advantages in structure and application than C/S mode. How to further expand the application of B/S mode monitoring system is the key to upgrade and replace the current industrial monitoring system. The industrial Web monitoring system based on ARM proposed in this paper can improve the current monitoring system having practical significance both economically and technically.
Design and Application of High Stubble Rice Harvester
Authors: Zhuang Xiaobo , Li Yaoming
Published: March 2020

In recent years, the state has adopted the policy of returning straw to farmland in rural areas to further reduce environmental pollution. Based on the demand of straw returning to the field, the original header design can not meet the needs of high stubble, the spring teeth will dial the ear head, resulting in greater waste. This paper studies and analyzes the current situation and characteristics of combine harvester, focusing on the loss of header and the structure and principle of reel. Determine the overall design scheme suitable for combine reel, provide an optimal value in the ratio of reel speed, study the optimal reel radius, and provide help for the design of reel in the future.
Study of the effect of differentiated cooling modes on the structure and mechanical properties of gray cast iron
Authors: Gabelchenko N I , Kidalov N A , Belov A A , Savchenko A I , Grigoreva N V
Published: March 2020

The effect of the differential cooling regime on the structure and mechanical properties of gray iron castings is investigated. A technical solution has been developed for the differentiated change in the cooling rate of cast iron castings. An increase in the cooling rate during dendritic crystallization was achieved by blowing the mold with compressed air. To slow down the cooling rate in the interval of eutectic transformation, an exothermic carbon-containing additive, fuel oil M-100, was used. It is shown that the use of controlled cooling can significantly increase the tensile strength of cast iron without introducing additional alloying elements into the composition of cast iron.
Weight efficiency analysis of a ship carbon shaft manufactured by winding with various winding angles in layers
Authors: Yu Duradzhi V
Published: March 2020

The task of the optimal winding parameters selection for the ship composite intermediate shaft has been formulated and the solution algorithm has been considered. A method for the shaft mechanical characteristics estimation on the base of the layer-by-layer method has been proposed. The shaft weight efficiency analysis for the various winding angles in the winding program has been carried out.
Fatigue crack development experimental simulation in a railway structures steel under working load
Authors: Lebedinsky S G , Moskvitin G V , Pugachev M S
Published: March 2020

The fatigue crack development regularities under working load simulation have been studied. The fatigue crack development pre-threshold region has been investigated. The level decrease method of irregular working load with similarity preservation has been applied. This is achieved with the test sample suppleness increase by a crack extension in it. Experimental dependences of the crack development rate on the number of working load blocks at its level decrease have been obtained.
Structural analysis of assemblies using non-conformal spectral element method
Authors: Vershinin A V , Levin V A , Kukushkin A V , Konovalov D A
Published: March 2020

An approach to the numerical simulation of a contact interaction between the deformable solids inside the assembly is considered in the article. A standard approach for solving such kind of problems is to imprint the boundaries and merge the solids along the common boundary zones. However this approach requires conformal discretization of the whole assembly including conformal meshes on the common boundary regions during the numerical simulation, which often causes significant problems for the industrial assemblies consisting of a large number of parts of different sizes. Test examples are considered for the verification of the developed in CAE Fidesys (www.cae-fidesys.com) algorithm of tying elastic solids by comparing simulation results with the solutions of similar problems for the case of merged solids with a conformal mesh discretization: static and modal analysis of the assemblies consisting of cubic, cylindrical and spherical bodies. A robustness of the algorithm and a continuity of the obtained solution are analyzed in case of gaps/overlaps between contacting solids. It is shown that small gaps and overlaps in CAD-model of an assembly do not influence much a correctness of numerical results and these cases are correctly and automatically processed in CAE Fidesys software module based on the described algorithm.
Evolution of disturbances that propagate in viscoelastic metamaterial
Authors: Kolesov D A , Erofeev V I , Krupenin V L , Malkhanov A O
Published: March 2020

We study the features of the propagation of a longitudinal wave in an acoustic (mechanical) metamaterial modeled as a one-dimensional chain containing the same masses connected by elastic elements (springs) having the same stiffness, each mass containing a series connection of another mass and a viscous element (damper). It is shown that the model under consideration allows us to describe the dispersion and frequency-dependent attenuation of a longitudinal wave, the nature of which substantially depends on the ratio of the external and internal masses of the metamaterial.
On the issue of energy consumption of vibration technological machines
Authors: Lyan I P , Panovko G Y , Shokhin A E
Published: March 2020

The article provides a comparative analysis of the energy consumption required for the implementation of the resonant and beyond-resonant modes of vibrating technological machines working body’s oscillations. An algorithm for selecting parameters of an electric drive based on an asynchronous electric engine to provide the specified amplitude and frequency of the working body oscillations for both modes of vibration is presented, taking into account frequency regulation, losses arising in the elastic suspension of the machine and in bearings of engine, the occurrence of reactive power and changes in the energy conversion efficiency.
Blood flow modeling with a finite element living heart model in the FlowVision software complex
Authors: Ovsyannikova E E , Kashirin V S
Published: March 2020

The paper presents the living heart finite element model, which can be used for heart beating simulation. The simulation of a human heartbeat is introduced in two settings – with artificial valves and tissue valves. The properties of tissue valves are similar to natural ones. The modelling was held using the FSI technology - fluid structure interaction – two-way coupling of the finite element model of the heart and the blood flow inside it. The finite element model of the heart was created as part of the Living Heart Project (the project of Simulia Dassault company).
Blood flow modeling with a gemo-library in the FlowVision software complex
Authors: Ovsyannikova E E , Silaev D P , Kashirin V S
Published: March 2020

The work deals with a hemodynamic library - an additional module for the FlowVision hydro-gasdynamic software package, which allows to set physical boundary conditions for projects related to modeling of the heart and blood vessels. The principle of the library is based on an electromechanical analogy.
Dynamic model of end-effector actuator used for mobile robotic weeder
Authors: Ivanov A G , Zhoga V V , Pavlovsky V.E , Vorob’yeva N S
Published: March 2020

A mathematical model was developed for dynamics of spatial controlled movements of end-effector being a multi-mass electromechanical system.
Motion specification algorithms for both platform and arms of a mobile robot for planetary research
Authors: Nanyageev I , Shardyko I , Dalyaev I
Published: March 2020

This article describes some aspects of the control system design for a four-wheel mobile platform with individual wheel-steering equipped with two redundant robotic arms. The considered control issues include different ways of platform maneuvering as well as a solution of inverse kinematics problem for a redundant arm with an original approach to redundancy resolution depending on operator’s intention.
Investigation of the configuration of a parallel manipulator for additive manufacturing of solid structures
Authors: Zelensky A. , Dubovskov V. , Kuptsov V.
Published: March 2020

The last decade has seen an increase in publications on mechatronic systems of parallel structure with flexible connections. Such manipulators are used in the field of videography of sports events and in crane structures for special purposes. The paper proposes and studies the question of the use of a parallel structure manipulator with flexible connections to create a complex of additive manufacturing of building structures. The basic structural schemes of kinematics of cable parallel manipulators are considered. The solutions of direct and inverse kinematics problems of parallel structures suitable for building additive systems are considered. The developed mathematical model of the kinematics of cable manipulators makes it possible to conduct further research on the implementation of the control system in real-time mode.
Control of vehicles and robots: creation of planning systems in the state space (MIPRA)
Authors: Aladin D V , Varlamov O O , Chuvikov D A , Adamova L E , Fedoseev D A
Published: March 2020

To control machines and robots, in addition to the well-known reflex level control systems, it is proposed to use logical level decision-making systems that are created on the basis of mivar expert systems. It is shown that the use of mivar expert systems makes it possible to solve problems of automatic planning of actions of robots in the state space. These tasks relate to STRIPS planning. The results of the study of the Mivar-based Intelligent Planner of Robot Actions (MIPRA) project have dramatically reduced the computing infrastructure requirements from servers to conventional computers and the time it takes to plan tasks for robot activities from weeks to seconds. Similar results after creating special knowledge bases can be obtained for groups of robots, multi-level heterogeneous robotic systems and cyber-physical systems of various bases and purposes, which is an important section in the control of machines and robots. Solving automatic planning tasks makes it possible to quickly develop driver assistance systems and move on to creating a fully autonomous smart car.
Problems of modeling the impact of a car on a road barrier by the finite element method
Authors: Demiyanushko I V , Mikheev P S , Karpov I A
Published: March 2020

Drivers safety is a high-priority task for engineers. One way to ensure this is to increase vehicles passive safety. Another way to improve road safety is to improve road fences design. This article is concerned with the issues of finite element (FE) modeling a vehicle collision with road fences using the LS-DYNA software package. The article presents a number of problems for modeling a vehicle with an oblique impact in a road fence, in particular, the friction issues between the vehicle tires and the road, the car friction elements and the road fence, problems of describing large deformations and fracture of parts with large FEM meshes and interactions with elements in a small overlap area.
Designing architecture of an artificial neural network for classification using robotic complexes
Authors: Kononenko K M , Demidov D G , Vinokur A I , Krupenin V L
Published: March 2020

This article describes the basic principles of constructing artificial neural networks for pattern recognition on raster images using robotic complexes. The basic parts of convolutional neural networks are considered. Examples of evaluating the accuracy of preliminary testing results developed by the authors of a convolutional neural network model are given.
Temperature aging effects on mechanical behavior of structural GFRP on interlaminar shear tests
Authors: Lobanov D S , Zubova E M
Published: March 2020

Aging of polymer composites is a wide-spread problem, which causes deterioration of mechanical properties, shorter design service life of structures and their potential early destruction. The work presents the results of experimental researches, within which the impact of elevated temperatures on mechanical properties of airborne constructional fiberglass were investigated. Research results were obtained, which describe the impact of the preliminary temperature aging (in different modes) on mechanical properties, behavior and execution of different composite destruction mechanisms during interlaminar shear testing. Experimental data were obtained, which describe the temperature impact on the mechanical behavior of constructional fiberglass samples at interlaminar shear. Regularities of fiberglass properties changing after temperature aging at interlaminar shear were analyzed, based on the joint use of testing systems and an acoustic emission (AE) signals recording system. Dependences of AE signal energy parameters on the time, combined with diagrams of fiberglass samples loading were obtained. Results of the distribution of specific frequency bands obtained after the destruction of samples with different preliminary aging modes, are graphically represented.
Nonlinear dynamics of closed cylindrical shells under the action of longitudinal and transversal loads
Authors: Saltykova O A , Yu Krylova E , Krysko V A
Published: March 2020

The nonlinear dynamics of a closed cylindrical shell, described by the kinematic model of the first approximation (Kirchhoff-Love) under the action of external alternating longitudinal and transverse loads, is studied. Geometric nonlinearity is described by the T. von Karman model. The resulting system of nonlinear partial differential equations is reduced to an ODE system using the Bubnov-Galerkin method in higher approximations, the Cauchy problem is solved by the 4th and 6th orders of accuracy with the Runge-Kutta method. Numerical results are compared with experimental data for longitudinal loads obtained by Zippo A., Barbieri M., Pellicano F. A qualitative agreement of the results is shown.
Experimental study of macroscopic localization of plastic flow in al-mg alloy under complicated stress-strain state
Authors: Tretyakova T V , Mugatarov A I , Feklistova E V
Published: March 2020

The main objective of this work is to investigate the spatial-time inhomogeneity due to the jerky flow during plastic deformation of Al-Mg alloy under complex stress conditions. The use of specimens in the form of plates with a rigid circular rim and a reverse curvature rim was considered. Experimental data on the evolution of inhomogeneous strain and temperature fields have been obtained, illustrating the processes of initiation and propagation of deformation bands of the localized plastic flow by using the digital image correlation and infrared thermography.
Research of the carbon/epoxy laminated curved beams strength in four-point bending test
Authors: Zubova E M , Lobanov D S , Strungar E M , Temerova M S
Published: March 2020

The experimental study results of the of the carbon/epoxy laminated curved beams strength of samples based on laminated carbon fiber and laminated carbon fiber reinforced in the transverse direction by Tufting firmware with four-point bending are presented. We obtained loading diagrams and diagrams of the dependence of the cumulative energy values of acoustic emission signals for layered samples and layered samples reinforced with transverse piercing. The tests were carried out according to the procedure agreed upon with the international standard ASTM D6415 with using the electromechanical system Instron 5965 and the acoustic emission signal recording system AMSY-6.
A mathematical model of the non-stationary filtration process for oil-supercritical CO2 system in a homogeneous porous medium under various modes of oil displacement
Authors: Radaev A.V , Kamil Sebur Ali , Essmat Abdul-lateef Wisam , Abdulaziz Abrahem Hussain , Plokhotnikov S.P , Salimyanov I.T , Vaseneva N.A , Sabirzyanov A.N
Published: March 2020

The phase diagram of the system “transformer oil-supercritical CO2” is built. The modes of miscible and microbubble displacement of oil are determined. Oil was displaced by carbon dioxide in a supercritical state on isotherms 313 and 333 K in the pressure range up to 12 MPa at the experimental bench created by the authors. New data have been obtained on the coefficient of oil displacement by supercritical CO2 from a model of a homogeneous oil reservoir in a miscible and micro-bubble mode of supercritical CO2 filtration. It was revealed that the miscible regime of oil displacement by supercritical CO2 has the greatest technological efficiency. For the region of a mixed filtration regime, a mathematical model was created and solved for the process of filtering the unsteady flow of “supercritical CO2-oil” in a homogeneous terrigenous porous medium in the pressure range up to 12 MPa, temperatures up to 333 K, the calculated curve agrees with the experimental data on the oil displacement coefficient. The convergence and stability of the difference scheme of the computational process is ensured. It was found that in the transition region of supercritical CO2 filtration on the boundary curve in the phase diagram and in the region of microbubble filtration of supercritical CO2, the process of oil displacement is more intense, which is associated with the appearance of a supercritical sublayer on the pore surface, which leads to slipping of the fluid inside the pore. For the transition-filtering region on the boundary curve in the phase diagram and in the region of the microbubble displacement of oil by supercritical carbon dioxide, a method for increasing technological efficiency is proposed based on the injection of supercritical CO2 and water rims to prevent the transition of microbubble carbon dioxide to the free phase.
Thermal Analysis and Temperature Distribution of Two-Layer and Spoke-Type Ferrite Interior Permanent Magnet Machine
Authors: Abdulrahem Hayder , Chi-Kwong Luk Patrick , Economou John
Published: March 2020

The main requirements for a rotating electric machine are the torque/power density and the energy efficiency. Producing an efficient electric machine required not only studying and analysing the electromagnetic properties but also deeper thermal analysis. It has been found that attention to the thermal design can be improve the total machine performance. In this paper a thermal model of the two-layer and spoke-type ferrite interior permanent magnet (IPM) machines is developed. FEA models are built to run the thermal studies and temperature distribution of the machine under different operating conditions. A prototype machine is built and tested for the experimental validations of the FEA. A prototype machine is tested under various working conditions. The testing results validate analytical model and the FEA methods.
Impact of the Weather on the Combined Economic and Emission Optimization Problem of MG
Authors: Al-Saadi Mohammed K. , Dakheel Hashmia Sh. , Abdullah Zainb B.
Published: March 2020

The high integration of renewable energy resources and utilizing of storage devices with possible exchange power with the utility grid make the optimization problem of microgrid (MG) significantly difficult comparing with the conventional systems. This paper quantifies the impact of weather conditions on the combined economic and emission optimal operation of the MG. The optimization problem is formulated as mixed integer quadratic program (MIQP), where the unit commitment (UC) is taken into consideration in the optimization problem. In addition, realistic constraints are taken into account to make the problem close to the real scenario. The proposed optimization approach is applied to the low voltage MG, which includes distributed generators (DGs), renewable energy sources (wind, solar) and storage battery. The results reveal that the abundant of wind and solar energies leads to reduce the operation and emission cost.
Portable field hospital fed from solar system depends on interleaved boost converter (IBC)
Authors: Makdisi Carlo Y. , Mariam Marah F. , Maarouf Jaafar T.
Published: March 2020

In this paper we will suggest equipment for a portable field hospital that is electrically fed by solar panels. The solar panel is connected to the removable (Portable) field hospital via an interface, which is an Interleaved Boost Converter (IBC). The analytical study is carried out for the traditional Boost Converter(BC) and the Interleaved Boost Converter (IBC) using Matlab/Simulink To ensure the electric supply of the portable field hospital with suitable voltage values. The paper will explain what might happen if we doubled or tripled the main elements of the conventional boost converter. The expected results will reflect the implementation importance of the interleaved converter (IBC) in comparison with conventional converter. We will also compare the different types of interleaved converter (IBC), so that we get the best interior connection of the IBC, which achieves the suitable distribution of the total current between the coils, as well as the best size – weight specifications. The selected IBC will contain less ripple in the output voltage waveform, where we provide the potable field hospital feed without disturbances or breakdowns, which cause the IBC to be out of serves or fault occurring to any part of it.
Optimized manufacturing of the small dual wind turbine used to generate electricity in central Iraq areas
Authors: Khalefa Muhannad Z. , Abd Alkarim Shereen F. , Salih Rasha S.
Published: March 2020

Start your Due to the importance of generating electricity from wind turbines, single rotor wind turbine and dual rotor wind turbine. There was a need to design and manufacture the turbine system operating in both types mentioned above and have advantages to increase the generation of electric power. The aim of this work was to generate electrical power at a wind speed of up to 1m/s and more to achieve this wind speed and direction of the wind were adopted from tables of the Zerbatiya Station of the Wasit Governorate (Geographically located in central Iraq). The simulation was used to generate rotational speed for front and rear blades from 1m/sec to 13m/sec. A new idea was used to induce the dual small wind turbine to generate electrical power at low speed (1m/sec). In this case, there is latent energy in the surrounding wind turbine, but it is not that helps to rotate the wind turbine. To apply this idea the starter motor is used. Passive magnetic bearing supports have been used to reduce friction of the rotors this will reduce losing of wind energy. Brakes are the mechanical devices which aimed to slow or shut down the machine. They are also designed to prevent moving after stopping. Finally, the Genetic Algorithm (GA) was used within the program for the purpose of obtaining the best amount of power generated. All the above were for the purpose of determining the best position for blades at different speeds to generate electricity by using Permanent Magnetic Synchronous Generator (400W).Results of this paper: (a)-The starter motor proved good performance when using it. (b)-Using passive magnetic bearing proved effect on increase the power generation. (c)-Mechanical brakes work to stop the system within a period of time and not immediately as this will negatively affect the performance of the system.
Experimental and Numerical Study of a New Corrugated and Packing Solar Collector
Authors: Jalil Jalal M. , Ahmed Majida K. , Idan Hussein A.
Published: March 2020

The thermal performance of a new solar air collector with corrugated packing is studied in this work. A new innovate shape was suggested in this paper to improve the thermal performance of the solar air collector. Mathematical models are developed to investigate the thermal performance of the collector and the results are verified by experiments. Effects of the operating parameters, solar radiation intensity and inlet air velocity are studied to optimize the thermal performance of the collector. Comparisons are conducted between the experimental and numerical results and good agreement was found. The new innovate shape shows better performance than other corrugated shapes and the absorber and air gained higher temperatures. The maximum temperature of air inside duct at the exit point was 69.1 C° at solar heat flow of 725 W/m2 and inlet velocity 1.0 m/s. The new shape shows better performance than other corrugated absorber.
BIM2BEM for room heating-cooling time estimation after turning on the HVAC systems
Authors: Pezeshki Zahra , Darabi Ahmad , Moghiman Mohammad
Published: March 2020

The complexity of real constructions, with irregular geometry, inhomogeneous materials, variable morphology, alterations and damages, poses numerous challenges in digital modeling and simulation of structural performances under different types of actions. Recent developments in Building Information Modeling (BIM) have introduced advanced modeling capabilities. This paper presents a new methodology using BIM2BEM for the estimation of heating and cooling time after we turn on the HVAC systems. The generation of the BIM is carried out with information of a case study model in Autodesk REVIT software. Then, BIM is turned into a Finite Element Model (FEM) in COMSOL Multiphysics software and Building Energy Modelling (BEM) is obtained in winter and summer which preserves irregularities and anomalies, such as verticality deviation and variable thickness. Afterwards, the cooling and heating time of the whole room after turning on the cooling and heating appliances was calculated and compared with reality results.
Numerical Investigation of Thermal Performance for Air Solar Collector with Multi Inlets
Authors: Jalil Jalal M. , Ayaal Adel H. , Hardan Abdulwahhab A.
Published: March 2020

Over the years, there has been rigorous modification of solar collectors for the thermal needs of the era to be efficiently served. A variety of design innovations have paved their way into the invention of novel ways of securing more solar energy as useful heat. Primarily, this study investigates the effects of multi air inlets on the transfer of heat between air flow and the absorber of flat plate collector. Computational Fluid Dynamics was employed to simulate a flat plate collector with 1, 2 and 3 inlets to evaluate the thermal performance with more than one inlet. The results showed that the 3 inlets case has the highest exit temperature followed by 2 inlets and then 1 inlet. Also higher exit air temperature can be obtained for higher heat flux and slower inlet velocity.
Intensification of heat transfer in the cooling systems of radio electronic equipment under free and forced convection
Authors: Lopatin A.A. , Kamil Sebur Ali , Ahmed Israa S. , Gabdullina R.A. , Biktagirova A.R.
Published: March 2020

This paper considers the issues of heat transfer intensification in the air cooling system of heat-loaded elements of radio-electronic equipment based on split fins. The results of the study of heat transfer in free and forced convection cooling systems for heat-loaded elements of electronic equipment are presented. The thermal efficiency of systems based on smooth and partially split ribs is compared; the efficiency of split ribs is 16-20%. The dependences of thermal resistance on thermal load are determined. The results of a comparison of mathematical and physical modeling are provided. The influence of the method of supplying heat to split ribs is estimated. Optimization of the work area is presented.
Performance Evaluation of Grid Wireless Sensor Network with Different Packet Size for Pipeline in Downstream of Oil and Gas Industry
Authors: Azman A S A , Lee M Y , Subramaniam S K , Feroz F S
Published: March 2020

In the past few decades, sensed data such as wind, vibration, temperature, and humidity were sent through the costly wire cable. With recent advancement and innovation in the wireless field, wireless sensor network (WSN) has emerged to benefit many industries in different aspects primarily in term of cost. WSN has been widely used in various applications due to its wide coverage area, particularly in oil and gas facility monitoring. Hence, the usage of grid WSN fits the wide coverage area mainly in the pipeline of downstream of oil and gas process. The main objective of this paper is to give a better understanding of the impact of different packet sizes, routing protocols, and the number of nodes towards a grid WSN as well as to provide open research issues in this field. Two types of routing protocols have been presented in this paper; reactive (AODV) and proactive (DSDV) with different packet sizes using a grid node arrangement. The simulated results have shown that with the increasing size of the network, more performance degradation occurred regardless of the packet size used. This issue can be seen through the packet loss and throughput loss in the network prominently after the deployment of 80 nodes and above. Apart from that, DSDV has shown a better delivery ratio, less number of passive nodes existence and less routing overhead produced in the network as compared to the AODV routing protocol.
Image Compression Using High Level Wavelet Transformer with Non-Uniform Quantizer and Different Levels Huffman Codes
Authors: Khalaf Gaber Rajaa , Abdulqader Hussein Ahmed , Kadhim Oudah Manal , Hameed Reja Ahmed
Published: March 2020

Image compression solutions are a pivotal field that gain over a remarkable research interest and called upon to extend widely with respect to the increasing of its applications. The considerable challenge of this solution is related to the storage and bandwidth requirements. A highly compression rate with a high image resolution is considered to be the key factors for implementing a robust image compression technique. In this paper, the proposed method is deemed to be simple and effective due to using different levels of compression process which is starting from dividing the image into sub-images and using high level discrete wavelet transform (DWT). In addition, the Huffman code with non-uniform Quantizer has been used to minimize the compression data rate with high quality reconstructed image. The promising simulation results of the proposed method achieved the most two significant criteria which are denoted by high image quality and a high image compressed ratio. For instance, the proposed strategy simulation results of Lena image achieved PSNR equals to 42.4094 dB with a compression ratio (CR) equals to 47.5435. Moreover, the simulation results of Flower image accomplished PSNR equals to 42.8348 dB with a compression ratio equals to 55.3389 under the same simulation conditions.
Design and Software Implementation of Analog and Digital Filters For Coherent Receivers under Noisy Channels
Authors: Thabit Ahmed A.
Published: March 2020

One of the most important stations in any communications system is the filtering station. Due to the noise power that effects on the signal, the system must include filtering process to eliminate this effect. In this paper, analog and digital filters are designed and implemented using Matlab tools to solve the problems occurred during receiving the signal that effects on the synchronization such as those for coherent receivers. The offsets of Phase and frequency are major problems in the identification of signals that results reduction in the performance; such as, whenever higher order modulations are used. Two systems are designed and simulated. The first one is analog system and the second one is digital system. 3rd order Butterworth filter is selected for system one and digital IIR filter is selected for system two. Filter order was selected according to diagnosis the level of noise power and the transmitted frequency to meet certain frequency domain design specifications. Obtained results showed excellent performance in the receiving and demodulating the received signal. Evaluation of the results is basically depend on comparison between the transmitted and received samples.
Relative Income Deprivation and All-Cause Mortality in Japan: Do Life Priorities Matter?
Authors: Gero Krisztina , Miyawaki Atsushi , Kawachi Ichiro
Published: March 2020

Background/Purpose

Relative deprivation (RD) is proposed to affect health through psychosocial stress stemming from upward social comparisons. This study hypothesized that prioritizing values, such as social engagement and personal growth (as opposed to prioritizing work), would inoculate against the toxic effects of upward social comparisons.

Methods

Prospective data of 9,533 subjects (4,475 men and 5,058 women) participating in the Komo-Ise study answering a baseline questionnaire in 1993 and a follow-up survey in 2000 were analyzed. Associations between RD—using Yitzhaki Index (YI) and Income Rank (IR)—and mortality were evaluated using Cox proportional-hazard regression models. At follow-up, people were also asked about what they prioritized in life: work, social engagement, or personal growth.

Results

1,168 deaths (761 men and 407 women) occurred during follow-up (to the end of 2011). Controlling for sociodemographic factors, the hazard ratio (HR) for mortality was 1.22 (95% confidence interval [CI] = 1.08–1.38) per a standard deviation (SD) increase in YI and 1.18 (95% CI = 1.03–1.35) per an SD decrease in IR. Life priorities (LP) were not statistically significantly associated with mortality. In women, the interaction between LP and YI was statistically significant. In fully adjusted models, women who endorsed only work as very important in their lives had a 2.66 (95% CI = 1.23–5.77) times higher HR for mortality per SD increase in YI compared to women who valued social engagement/personal growth. An interaction between LP and RD was not found in men.

Conclusions

Increased relative income deprivation was associated with a higher risk of all-cause mortality independently of absolute income. Focusing on social engagement/personal growth (as opposed to work) appears to inoculate women against the toxic effects of relative deprivation.
Health Warnings and Beverage Purchase Behavior: Mediators of Impact
Authors: Grummon Anna H , Brewer Noel T
Published: March 2020

Background

To reduce diet-related chronic disease, policymakers have proposed requiring health warnings on sugar-sweetened beverages (SSBs). Health warnings reduced purchases of these products by 22% in our recent randomized controlled trial, but the mechanisms remain unclear.

Purpose

We sought to identify the psychological mechanisms that explain why SSB health warnings affect purchase behavior.

Methods

In 2018, we recruited 400 adult SSB consumers to complete a shopping task in a naturalistic convenience store laboratory in North Carolina, USA. We randomly assigned participants to either a health warning arm (all SSBs in the store displayed a text health warning) or to a control arm (SSBs displayed a control label). Participants selected items to purchase with cash.

Results

Compared to control labels, health warnings elicited more attention, negative affect, anticipated social interactions, and thinking about harms (range of ds = 0.63–1.34; all p < .001). Health warnings also led to higher injunctive norms about limiting SSB consumption (d = 0.27, p = .008). Except for attention, all of these constructs mediated the effect of health warnings on SSB purchases (all p < .05). In contrast, health warnings did not influence other attitudes or beliefs about SSBs or SSB consumption (e.g., healthfulness, outcome expectations, and response efficacy).

Conclusions

Health warnings on sugar-sweetened beverages affected purchase behavior by eliciting negative emotions, increasing anticipated social interactions, keeping SSBs’ harms at top of mind, and shifting norms about beverage consumption. Results are consistent with recent studies of why tobacco warnings influence quitting behavior, pointing toward a general framework for understanding how health warnings affect behavior.

Clinical Trials Registration

NCT #03511937.
Cultural Adaptations of Evidence-Based Mental Health Interventions for Refugees: Implications for Clinical Social Work
Authors: Fennig Maya
Published: March 2020

As the number of refugees worldwide reaches unprecedented levels, social workers’ ability to provide effective and appropriate mental healthcare to this population is as critical as ever. This article provides a review of contemporary debates revolving around the cultural adaptation (CA) of mental health interventions—when it is warranted, what approach should be taken and what components of an intervention should be adapted. CA is presented as a promising and pragmatic approach to service delivery, one that can assist clinical social workers in designing and implementing interventions that reflect refugees’ local needs and knowledge without neglecting important advances in research evidence and clinical expertise. However, it is not without its challenges. By drawing on literature related to the integration of cultural and contextual factors in mental health interventions and services, the article addresses critical issues in the CA approach and asks: is it possible to strike a balance between fidelity to evidence-based interventions and culturally compatible care?
Bidirectional gut-to-brain and brain-to-gut propagation of synucleinopathy in non-human primates
Authors: Arotcarena Marie-Laure , Dovero Sandra , Prigent Alice , Bourdenx Mathieu , Camus Sandrine , Porras Gregory , Thiolat Marie-Laure , Tasselli Maddalena , Aubert Philippe , Kruse Niels , Mollenhauer Brit , Trigo Damas Ines , Estrada Cristina , Garcia-Carrillo Nuria , Vaikath Nishant N , El-Agnaf Omar M A , Herrero Maria Trinidad , Vila Miquel , Obeso Jose A , Derkinderen Pascal , Dehay Benjamin , Bezard Erwan
Published: March 2020

In Parkinson’s disease, synucleinopathy is hypothesized to spread from the enteric nervous system, via the vagus nerve, to the CNS. Here, we compare, in baboon monkeys, the pathological consequences of either intrastriatal or enteric injection of α-synuclein-containing Lewy body extracts from patients with Parkinson’s disease. This study shows that patient-derived α-synuclein aggregates are able to induce nigrostriatal lesions and enteric nervous system pathology after either enteric or striatal injection in a non-human primate model. This finding suggests that the progression of α-synuclein pathology might be either caudo-rostral or rostro-caudal, varying between patients and disease subtypes. In addition, we report that α-synuclein pathological lesions were not found in the vagal nerve in our experimental setting. This study does not support the hypothesis of a transmission of α-synuclein pathology through the vagus nerve and the dorsal motor nucleus of the vagus. Instead, our results suggest a possible systemic mechanism in which the general circulation would act as a route for long-distance bidirectional transmission of endogenous α-synuclein between the enteric and the central nervous systems. Taken together, our study provides invaluable primate data exploring the role of the gut-brain axis in the initiation and propagation of Parkinson’s disease pathology and should open the door to the development and testing of new therapeutic approaches aimed at interfering with the development of sporadic Parkinson’s disease.