Subjects -> ENGINEERING (Total: 2688 journals)
    - CHEMICAL ENGINEERING (229 journals)
    - CIVIL ENGINEERING (237 journals)
    - ELECTRICAL ENGINEERING (176 journals)
    - ENGINEERING (1325 journals)
    - ENGINEERING MECHANICS AND MATERIALS (452 journals)
    - HYDRAULIC ENGINEERING (56 journals)
    - INDUSTRIAL ENGINEERING (98 journals)
    - MECHANICAL ENGINEERING (115 journals)

ENGINEERING (1325 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 601 - 800 of 1205 Journals sorted alphabetically
International Journal of Quality Assurance in Engineering and Technology Education     Full-text available via subscription   (Followers: 3)
International Journal of Quality Engineering and Technology     Hybrid Journal   (Followers: 4)
International Journal of Quantum Information     Hybrid Journal   (Followers: 6)
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 3)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access  
International Journal of Reliability, Quality and Safety Engineering     Hybrid Journal   (Followers: 14)
International Journal of Renewable Energy Technology     Hybrid Journal   (Followers: 8)
International Journal of Robust and Nonlinear Control     Hybrid Journal   (Followers: 10)
International Journal of Science and Innovative Technology     Open Access  
International Journal of Science Engineering and Advance Technology     Open Access  
International Journal of Sediment Research     Full-text available via subscription   (Followers: 2)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal  
International Journal of Service Science, Management, Engineering, and Technology     Full-text available via subscription   (Followers: 2)
International Journal of Signal and Imaging Systems Engineering     Hybrid Journal  
International Journal of Six Sigma and Competitive Advantage     Hybrid Journal   (Followers: 4)
International Journal of Social Robotics     Hybrid Journal   (Followers: 3)
International Journal of Software Engineering and Knowledge Engineering     Hybrid Journal   (Followers: 6)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 13)
International Journal of Speech Technology     Hybrid Journal   (Followers: 7)
International Journal of Spray and Combustion Dynamics     Full-text available via subscription   (Followers: 15)
International Journal of Student Project Reporting     Hybrid Journal   (Followers: 4)
International Journal of Surface Engineering and Interdisciplinary Materials Science     Full-text available via subscription   (Followers: 1)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 4)
International Journal of Sustainable Lighting     Open Access  
International Journal of Sustainable Manufacturing     Hybrid Journal   (Followers: 4)
International Journal of Systems and Service-Oriented Engineering     Full-text available via subscription  
International Journal of Systems Assurance Engineering and Management     Hybrid Journal  
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 6)
International Journal of Technoethics     Full-text available via subscription   (Followers: 2)
International Journal of Technology Management and Sustainable Development     Hybrid Journal   (Followers: 1)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 6)
International Journal of Telemedicine and Applications     Open Access   (Followers: 4)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 18)
International Journal of Thermodynamics     Open Access   (Followers: 15)
International Journal of Transportation Engineering     Open Access   (Followers: 2)
International Journal of Turbomachinery, Propulsion and Power     Open Access   (Followers: 23)
International Journal of Ultra Wideband Communications and Systems     Hybrid Journal  
International Journal of Vehicle Autonomous Systems     Hybrid Journal  
International Journal of Vehicle Design     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Information and Communication Systems     Hybrid Journal   (Followers: 1)
International Journal of Vehicle Noise and Vibration     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Safety     Hybrid Journal   (Followers: 3)
International Journal of Virtual Technology and Multimedia     Hybrid Journal   (Followers: 2)
International Journal of Wavelets, Multiresolution and Information Processing     Hybrid Journal  
International Journal on Artificial Intelligence Tools     Hybrid Journal   (Followers: 9)
International Journal on Smart Sensing and Intelligent Systems     Open Access  
International Nano Letters     Open Access   (Followers: 6)
International Review of Applied Sciences and Engineering     Full-text available via subscription  
International Scholarly Research Notices     Open Access   (Followers: 123)
International Scientific and Vocational Studies Journal     Open Access  
International Scientific Journal of Engineering and Technology (ISJET)     Open Access  
Inventions     Open Access  
Inventum     Open Access  
Inverse Problems in Science and Engineering     Hybrid Journal   (Followers: 3)
Investiga : TEC     Open Access  
Ionics     Hybrid Journal   (Followers: 2)
IPTEK The Journal for Technology and Science     Open Access  
Iranian Journal of Optimization     Open Access   (Followers: 2)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
IRBM News     Full-text available via subscription  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
ISA Transactions     Full-text available via subscription  
ISSS Journal of Micro and Smart Systems     Hybrid Journal   (Followers: 3)
IT Professional     Full-text available via subscription   (Followers: 24)
Iteckne     Open Access  
J-ENSITEC : Journal Of Engineering and Sustainable Technology     Open Access   (Followers: 4)
Johnson Matthey Technology Review     Open Access  
Journal of Advanced College of Engineering and Management     Open Access  
Journal of Advanced Joining Processes     Open Access  
Journal of Advanced Manufacturing Systems     Hybrid Journal   (Followers: 5)
Journal of Aerodynamics     Open Access   (Followers: 27)
Journal of Aerosol Science     Hybrid Journal   (Followers: 7)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 66)
Journal of Alloys and Compounds     Hybrid Journal   (Followers: 16)
Journal of Analytical and Applied Pyrolysis     Hybrid Journal   (Followers: 5)
Journal of Analytical Science & Technology     Open Access   (Followers: 4)
Journal of Analytical Sciences, Methods and Instrumentation     Open Access   (Followers: 4)
Journal of Applied Engineering Sciences     Open Access  
Journal of Applied Physics     Hybrid Journal   (Followers: 69)
Journal of Applied Research and Technology     Open Access  
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences     Open Access   (Followers: 4)
Journal of Architectural and Engineering Research     Open Access   (Followers: 3)
Journal of Architectural Engineering     Full-text available via subscription   (Followers: 4)
Journal of Automation and Control     Open Access   (Followers: 9)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 10)
Journal of Biological Dynamics     Open Access   (Followers: 1)
Journal of Biomedical Science     Open Access   (Followers: 4)
Journal of Biomolecular NMR     Hybrid Journal   (Followers: 6)
Journal of Biosciences     Open Access   (Followers: 1)
Journal of Building Pathology and Rehabilitation     Hybrid Journal  
Journal of Catalysis     Hybrid Journal   (Followers: 11)
Journal of Catalyst & Catalysis     Full-text available via subscription   (Followers: 2)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Chemical and Petroleum Engineering     Open Access   (Followers: 1)
Journal of China Coal Society     Open Access  
Journal of China Universities of Posts and Telecommunications     Full-text available via subscription  
Journal of Cleaner Production     Hybrid Journal   (Followers: 27)
Journal of Coastal and Riverine Flood Risk (JCRFR)     Open Access   (Followers: 1)
Journal of Cold Regions Engineering     Full-text available via subscription   (Followers: 3)
Journal of Combinatorial Designs     Hybrid Journal   (Followers: 4)
Journal of Combustion     Open Access   (Followers: 40)
Journal of Computational and Nonlinear Dynamics     Full-text available via subscription   (Followers: 6)
Journal of Computational and Theoretical Nanoscience     Full-text available via subscription  
Journal of Computational Biology     Hybrid Journal   (Followers: 9)
Journal of Computational Design and Engineering     Open Access   (Followers: 1)
Journal of Computational Electronics     Hybrid Journal   (Followers: 5)
Journal of Computational Multiphase Flows     Open Access   (Followers: 1)
Journal of Computing and Information Science in Engineering     Full-text available via subscription   (Followers: 1)
Journal of Coupled Systems and Multiscale Dynamics     Full-text available via subscription  
Journal of Dairy Science     Open Access   (Followers: 12)
Journal of Delta Urbanism     Open Access   (Followers: 2)
Journal of Display Technology     Hybrid Journal   (Followers: 3)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 14)
Journal of Dynamical and Control Systems     Hybrid Journal   (Followers: 7)
Journal of Earthquake Engineering     Hybrid Journal   (Followers: 14)
Journal of Elasticity     Hybrid Journal   (Followers: 7)
Journal of Electroceramics     Hybrid Journal  
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 10)
Journal of Electronic Testing     Hybrid Journal   (Followers: 2)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 9)
Journal of Electrostatics     Hybrid Journal   (Followers: 2)
Journal of Energy Engineering     Full-text available via subscription   (Followers: 7)
Journal of Energy Resources Technology     Full-text available via subscription   (Followers: 4)
Journal of Engineering     Open Access  
Journal of Engineering     Open Access   (Followers: 1)
Journal of Engineering and Applied Science     Open Access  
Journal of Engineering and Technological Sciences     Open Access   (Followers: 2)
Journal of Engineering Design     Hybrid Journal   (Followers: 17)
Journal of Engineering Education     Hybrid Journal   (Followers: 7)
Journal of Engineering for Gas Turbines and Power     Full-text available via subscription   (Followers: 15)
Journal of Engineering Mathematics     Hybrid Journal   (Followers: 2)
Journal of Engineering Mechanics     Full-text available via subscription   (Followers: 16)
Journal of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 2)
Journal of Engineering Research     Open Access   (Followers: 1)
Journal of Engineering Research and Reports     Open Access  
Journal of Engineering Technology and Applied Sciences     Open Access  
Journal of Engineering Thermophysics     Hybrid Journal   (Followers: 4)
Journal of Engineering, Design and Technology     Hybrid Journal   (Followers: 17)
Journal of Engineering, Project, and Production Management     Open Access  
Journal of Environmental & Engineering Geophysics     Hybrid Journal   (Followers: 2)
Journal of Environmental Engineering     Full-text available via subscription   (Followers: 49)
Journal of Environmental Engineering and Landscape Management     Open Access   (Followers: 8)
Journal of Environmental Engineering and Science     Hybrid Journal   (Followers: 2)
Journal of Experimental Nanoscience     Hybrid Journal  
Journal of Fire Sciences     Hybrid Journal   (Followers: 6)
Journal of Flood Risk Management     Hybrid Journal   (Followers: 14)
Journal of Flow Control, Measurement & Visualization     Open Access   (Followers: 1)
Journal of Fluids Engineering     Full-text available via subscription   (Followers: 30)
Journal of Fourier Analysis and Applications     Hybrid Journal   (Followers: 3)
Journal of Fuel Cell Science and Technology     Full-text available via subscription   (Followers: 2)
Journal of Functional Analysis     Full-text available via subscription   (Followers: 3)
Journal of Fundamental and Applied Sciences     Open Access  
Journal of Geological Research     Open Access   (Followers: 1)
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical Engineering     Full-text available via subscription   (Followers: 4)
Journal of Geovisualization and Spatial Analysis     Hybrid Journal  
Journal of Global Optimization     Hybrid Journal   (Followers: 6)
Journal of Graduate School of Natural and Applied Sciences of Mehmet Akif Ersoy University     Open Access  
Journal of Hazardous Materials Advances     Open Access  
Journal of Healthcare Engineering     Open Access   (Followers: 3)
Journal of Heat Transfer     Full-text available via subscription   (Followers: 66)
Journal of Humanitarian Engineering     Open Access   (Followers: 1)
Journal of Hydraulic Engineering     Full-text available via subscription   (Followers: 27)
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 23)
Journal of Imaging     Open Access   (Followers: 3)
Journal of Industrial and Production Engineering     Hybrid Journal   (Followers: 4)
Journal of Industrial Engineering and Management     Open Access   (Followers: 5)
Journal of Industrial Safety Engineering     Full-text available via subscription   (Followers: 6)
Journal of Inequalities and Applications     Open Access  
Journal of Infrared, Millimeter and Terahertz Waves     Hybrid Journal   (Followers: 3)
Journal of Infrastructure Preservation and Resilience     Open Access   (Followers: 1)
Journal of Institute of Science and Technology     Open Access  
Journal of Intelligent and Connected Vehicles     Open Access   (Followers: 1)
Journal of Intelligent Systems : Theory and Applications     Open Access  
Journal of International Maritime Safety, Environmental Affairs, and Shipping     Open Access   (Followers: 1)
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 7)
Journal of Irrigation and Drainage Engineering     Full-text available via subscription   (Followers: 24)
Journal of King Saud University - Engineering Sciences     Open Access  
Journal of KONBiN     Open Access   (Followers: 4)
Journal of Liquid Chromatography & Related Technologies     Hybrid Journal   (Followers: 7)
Journal of Management in Engineering     Full-text available via subscription   (Followers: 9)
Journal of Manufacturing Science and Engineering     Full-text available via subscription   (Followers: 32)
Journal of Manufacturing Systems     Full-text available via subscription   (Followers: 3)
Journal of Manufacturing Technology Management     Hybrid Journal   (Followers: 3)
Journal of Mechanical Design and Testing     Open Access   (Followers: 4)
Journal of Mechatronics     Full-text available via subscription   (Followers: 3)
Journal of Mega Infrastructure & Sustainable Development     Hybrid Journal  
Journal of Metallurgy     Open Access   (Followers: 8)
Journal of Mining Institute     Open Access  
Journal of Motor Behavior     Hybrid Journal   (Followers: 8)
Journal of Multivariate Analysis     Hybrid Journal   (Followers: 15)
Journal of Nanoengineering and Nanomanufacturing     Full-text available via subscription  
Journal of Nanoparticle Research     Hybrid Journal   (Followers: 3)
Journal of Nanoscience     Open Access  
Journal of Nanoscience and Nanotechnology     Full-text available via subscription   (Followers: 8)
Journal of NanoScience, NanoEngineering & Applications     Full-text available via subscription  
Journal of Nanotechnology     Open Access   (Followers: 10)
Journal of Nanotechnology in Engineering and Medicine     Full-text available via subscription   (Followers: 4)

  First | 1 2 3 4 5 6 7 | Last

Similar Journals
Journal Cover
Journal of Central South University
Journal Prestige (SJR): 0.336
Citation Impact (citeScore): 1
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2095-2899 - ISSN (Online) 2227-5223
Published by Springer-Verlag Homepage  [2469 journals]
  • Model tests on uplift capacity of double-belled pile influenced by
           distance between bells

    • Free pre-print version: Loading...

      Abstract: Abstract To optimize the distance between the bells in pile design, this paper reports a series of small scale tests on the uplift capacity of double belled piles embedded in dry dense sand considering different bell space ratios. Finite element modelling is also performed to evaluate the range of soil failure around the piles during pile uplift displacement. Test results show that when bell space ratio is 6 or 8, the uplift capacity reaches the peak value. The upper bell bears more load than the lower one for the piles with bell space ratio less than 6, while the lower bell bears more load than the upper one for the piles with bell space ratio larger than 8.
      PubDate: 2022-05-04
       
  • Complex geometric modeling and tooth contact analysis of a helical face
           gear pair with arc-tooth

    • Free pre-print version: Loading...

      Abstract: Abstract A complex geometric modeling method of a helical face gear pair with arc-tooth generated by an arc-profile cutting (APC) disc is proposed, and its tooth contact characteristics are analyzed. Firstly, the spatial coordinate system of an APC face gear pair is established based on meshing theory. Combining the coordinate transformation matrix and the tooth profile of the cutter, the equations of the curve envelope of the APC face gear pair are obtained. Then the surface equations are solved to extract the point clouds data by programming in MATLAB, which contains the work surface and the fillet surface of the APC face gear pair. And the complex geometric model of the APC face gear pair is built by fitting its point clouds. At last, through the analysis of the tooth surface contact, the sensitivity of the APC face gear to the different types of mounting errors is obtained. The results show that the APC face gear pair is the most sensitive to mounting errors in the tooth thickness direction, and it should be strictly controlled in the actual application.
      PubDate: 2022-05-04
       
  • A new discriminative sparse parameter classifier with iterative removal
           for face recognition

    • Free pre-print version: Loading...

      Abstract: Abstract Face recognition has been widely used and developed rapidly in recent years. The methods based on sparse representation have made great breakthroughs, and collaborative representation-based classification (CRC) is the typical representative. However, CRC cannot distinguish similar samples well, leading to a wrong classification easily. As an improved method based on CRC, the two-phase test sample sparse representation (TPTSSR) removes the samples that make little contribution to the representation of the testing sample. Nevertheless, only one removal is not sufficient, since some useless samples may still be retained, along with some useful samples maybe being removed randomly. In this work, a novel classifier, called discriminative sparse parameter (DSP) classifier with iterative removal, is proposed for face recognition. The proposed DSP classifier utilizes sparse parameter to measure the representation ability of training samples straight-forward. Moreover, to avoid some useful samples being removed randomly with only one removal, DSP classifier removes most uncorrelated samples gradually with iterations. Extensive experiments on different typical poses, expressions and noisy face datasets are conducted to assess the performance of the proposed DSP classifier. The experimental results demonstrate that DSP classifier achieves a better recognition rate than the well-known SRC, CRC, RRC, RCR, SRMVS, RFSR and TPTSSR classifiers for face recognition in various situations.
      PubDate: 2022-05-04
       
  • Markov chain-based platoon recognition model in mixed traffic with
           human-driven and connected and autonomous vehicles

    • Free pre-print version: Loading...

      Abstract: Abstract Many vehicle platoons are interrupted while traveling on roads, especially at urban signalized intersections. One reason for such interruptions is the inability to exchange real-time information between traditional human-driven vehicles and intersection infrastructure. Thus, this paper develops a Markov chain-based model to recognize platoons. A simulation experiment is performed in Vissim based on field data extracted from video recordings to prove the model’s applicability. The videos, recorded with a high-definition camera, contain field driving data from three Tesla vehicles, which can achieve Level 2 autonomous driving. The simulation results show that the recognition rate exceeds 80% when the connected and autonomous vehicle penetration rate is higher than 0.7. Whether a vehicle is upstream or downstream of an intersection also affects the performance of platoon recognition. The platoon recognition model developed in this paper can be used as a signal control input at intersections to reduce the unnecessary interruption of vehicle platoons and improve traffic efficiency.
      PubDate: 2022-05-04
       
  • Permanent deformation and prediction model of construction and demolition
           waste under repeated loading

    • Free pre-print version: Loading...

      Abstract: Abstract This study aims to reveal the macroscopic permanent deformation (PD) behavior and the internal structural evolution of construction and demolition waste (CDW) under loading. Firstly, the initial matric suction of CDW was measured by the filter paper method. Secondly, the PD of CDW with different humidity and stress states was investigated by repeated load triaxial tests, and a comprehensive prediction model was established. Finally, the discrete element method was performed to analyze the internal structural evolution of CDW during deformation. These results showed that the VAN-GENUCHTEN model could describe the soil-water characteristic curve of CDW well. The PD increases with the increase of the deviator stress and the number of cyclic loading, but the opposite trend was observed when the initial matric suction and confining pressure increased. The proposed model in this study provides a satisfactory prediction of PD. The discrete element method could accurately simulate the macroscopic PD of CDW, and the shear force, interlock force and sliding content increase with the increase of deviator stress during the deformation. The research could provide useful reference for the deformation stability analysis of CDW under cyclic loading.
      PubDate: 2022-05-04
       
  • Heat transfer analysis and experimental study of unequal diameter
           twin-roll casting process for fabricating Cu/Al clad strips

    • Free pre-print version: Loading...

      Abstract: Abstract Unequal diameter twin-roll casting (UDTRC) can improve the formability, surface conditions, and production efficiency during the fabrication of clad strips. Using Fluent software, a numerical simulation is used to study the asymmetric heat transfer characteristics of Cu/Al clad strips fabricated by UDTRC. The effects of roller velocity ratio, Cu strip thickness, and inclination angle on the kissing point position, as well as the entire temperature distribution are obtained. The heat transfer model is established, and the mechanism is discussed. The Cu strip and rollers are found to be the main causes of asymmetric heat transfer, indicating that the roller velocity ratio changes the liquid zone proportion in the molten pool. The Cu strip thickness determines the heat absorption capacity and the variations in thermal resistance between the molten Al and the big roller. The inclination angle of the small roller changes the cooling time of big roller to molten Al. Moreover, the microstructure of Al cladding under different roller velocity ratios is examined. The results show significant grain refinement caused by the shear strain along the thickness direction of Al cladding and the intense heat transfer at the moment of contact between the metal Al cladding and Cu strip.
      PubDate: 2022-05-04
       
  • Effect of Ni/Fe ratio on activation sintering and mechanical properties of
           molybdenum nickel iron alloy

    • Free pre-print version: Loading...

      Abstract: Abstract In order to improve the low ductility of the Mo-Ni alloy, Fe is added and the effects of Ni/Fe mass ratio on the densification behavior, microstructure evolution and mechanical properties of alloy were investigated. The experimental results show that when iron is added to 95Mo-5Ni alloy, the formation of brittle intermetallic phase δ-MoNi at the grain boundary is avoided. Meanwhile, the grain growth of Mo is also effectively inhibited in the sintering process. However, the addition of iron reduces the degree of densification of alloy since the activation effect of Ni is superior to that of Fe. From the experimental results, it could be concluded that the maximum hardness and bending strength are achieved by 95Mo-1.5Ni-3.5Fe alloy, which are HV 614 and 741 MPa, respectively. Combined with the analyses of bending fracture mechanism, the improvement relative to Mo-Ni alloy is likely attributed to the inhibition of the brittle phase.
      PubDate: 2022-05-04
       
  • Effects of confining pressure on deformation failure behavior of jointed
           rock

    • Free pre-print version: Loading...

      Abstract: Abstract For a deeper understanding of the deformation failure behavior of jointed rock, numerical compression simulations are carried out on a rock specimen containing non-persistent joints under confining pressure with the bonded-particle model. The microscopic parameters which can reflect the macroscopic mechanical properties and failure behavior of artificial jointed specimens are firstly calibrated. Then, the influence of joint inclination and confining pressure on stress — strain curves, crack patterns, and contact force distributions of jointed rock are investigated. The simulation results show that both the compressive strength and elastic modulus of the specimens increase with increasing confining pressure, and these two mechanical parameters decrease first and then increase with the increase of joints inclination. The sensitivity of strength and elastic modulus to confining pressure is not the same in different joints inclinations, which has the least impact on specimens with α=90°. Under low confining pressure, the failure modes are controlled by the joint inclination. As the confining pressure increased, the initiation and propagation of tensile crack are gradually inhibited, and the failure mode is transferred from tensile failure to shear-compression failure. Finally, the reinforcement effect of prestressed bolt support on engineering fractured rock mass is discussed.
      PubDate: 2022-04-29
       
  • Effect of Na2O on transition and stability of dicalcium silicate based on
           sintering process

    • Free pre-print version: Loading...

      Abstract: Abstract The phase transition, morphology, stability and pulverization performance of dicalcium silicate (C2S) with different Na2O additions during the high-temperature sintering process were studied using XRD, SEM-EDS, FT-IR, and Raman spectra methods. When the CaO to SiO2 molar ratio is 2.0 and the Na2O to SiO2 molar ratio is below 0.20, the crystalline calcium silicate compounds include γ-C2S and β-C2S. As the Na2O addition increases, the proportion, crystallinity and grain size of β-C2S in the sintered products increase, those parameters of γ-C2S decrease, and the content of amorphous phase increases. Na2O mainly forms solid solutions in β-C2S and inhibits the transition of β-C2S to γ-C2S, resulting in the sintered products unpulverized. The stability of sintered products in alkali solution decreases significantly with the increasing Na2O additions, and the β-C2S solid solution with Na2O is less stable than γ-C2S. The mechanism that Na2O affects the transition of C2S as well as its stability was also discussed, which can give actual guidance for the treatment of low-grade alumina-containing resources by the sintering process.
      PubDate: 2022-04-29
       
  • Optical and electrical properties of room temperature prepared α-IGZO
           thin films using an In2Ga2ZnO7 ceramic target

    • Free pre-print version: Loading...

      Abstract: Abstract In this study, a high-purity In2Ga2ZnO7 ceramic target was used to deposit indium gallium zinc oxide (IGZO) films by RF magnetron sputtering technology. The microstructure, growth state, optical and electrical properties of the IGZO films were studied. The results showed that the surface of the IGZO film was uniform and smooth at room temperature. As the substrate temperature increased, the surface roughness of the film gradually increased. From room temperature to 300 ° C, all the films maintained amorphous phase and good thermal stabilities. Moreover, the transmission in the visible region decreased from 91.93% to 91.08%, and the band gap slightly decreased from 3.79 to 3.76 eV. The characterization of the film via atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS) demonstrated that the film prepared at room temperature exhibited the lowest surface roughness and the largest content of oxygen vacancies. With the rise in temperature, the non-homogeneous particle distribution, increase in the surface roughness, and reduction in the number of oxygen vacancies resulted in lower performance of the α-IGZO film. Comprehensive analysis showed that the best optical and electrical properties can be obtained by depositing IGZO films at room temperature, which indicates their potential applications in flexible substrates.
      PubDate: 2022-04-01
       
  • Elastoplastic analysis of solid structures using penalty-based couple
           stress finite element method within framework of Cosserat continuum

    • Free pre-print version: Loading...

      Abstract: Abstract To obviate the complexities of the straight forward couple stress finite element method, the penalty-based couple stress finite element method (named PcouFEM) within the framework of the Cosserat continuum is utilized to obtain the approximate solution by relaxing the C1 continuity. To examine the performance of the PcouFEM, three well-known numerical examples are investigated. For the analysis on stress concentration around the circular hole of the planestrain specimen, it was found that as long as the penalty factor Gc is not less than 5 times the shear modulus of the classical continuum G (i. e., Gc⩾5G), the stress concentration factors calculated by the PcouFEM with the reduced integration scheme agree well with the analytical solutions. For the strain localization analysis in the uniaxial compression test, it was observed that by applying the PcouFEM, the pathologically mesh-dependent problem associated with the conventional FEM can be alleviated or even removed, and based on numerical simulations, it is recommended to define 5G⩽Gc⩽10G from the perspective of numerical accuracy. For the soil slope subjected to an eccentric load through the rigid strip footing, it was found that the mesh-dependent problem of the shear band simulation can be largely alleviated by applying the PcouFEM.
      PubDate: 2022-04-01
       
  • Hourly traffic flow forecasting using a new hybrid modelling method

    • Free pre-print version: Loading...

      Abstract: Abstract Short-term traffic flow forecasting is a significant part of intelligent transportation system. In some traffic control scenarios, obtaining future traffic flow in advance is conducive to highway management department to have sufficient time to formulate corresponding traffic flow control measures. In hence, it is meaningful to establish an accurate short-term traffic flow method and provide reference for peak traffic flow warning. This paper proposed a new hybrid model for traffic flow forecasting, which is composed of the variational mode decomposition (VMD) method, the group method of data handling (GMDH) neural network, bi-directional long and short term memory (BILSTM) network and ELMAN network, and is optimized by the imperialist competitive algorithm (ICA) method. To illustrate the performance of the proposed model, there are several comparative experiments between the proposed model and other models. The experiment results show that 1) BILSTM network, GMDH network and ELMAN network have better predictive performance than other single models; 2) VMD can significantly improve the predictive performance of the ICA-GMDH-BILSTM-ELMAN model. The effect of VMD method is better than that of EEMD method and FEEMD method. To conclude, the proposed model which is made up of the VMD method, the ICA method, the BILSTM network, the GMDH network and the ELMAN network has excellent predictive ability for traffic flow series.
      PubDate: 2022-04-01
       
  • Preparation of porous silica from natural chlorite via selective acid
           leaching and its application in methylene blue adsorption

    • Free pre-print version: Loading...

      Abstract: Abstract In this study, porous silica with high surface area was prepared through selective leaching of thermally activated chlorite in HCl solution. In the process, chlorite was activated by pre-calcining treatment, then activated components (MgO, Al2O3, and Fe2O3) were selectively leached by acid solution, resulting in the formation of nanopores in situ. The morphology, structure, surface area and pore-size distribution of the material were characterized by XRD, TG/DSC, 27Al MAS NMR, SEM, TEM and N2 adsorption-desorption isotherms. The highest specific surface area (SBET=333 m2/g) was obtained by selectively leaching the 600 °C calcined chlorite from 3 mol/L HCl at 90 °C for 2 h. The pore sizes and specific surface areas can be controlled by calcination and leaching conditions. The 27Al MAS NMR spectra of the samples revealed the relationship between structural transformation and the selective acid leaching properties of thermal-activated chlorite, demonstrating that AlVI transfers into AlV when chlorite changes into activated chlorite during thermal activation, and the coordinations of Al has a significant effect on acid solubility of chlorite. The as-prepared porous silica showed favorable adsorption abilities with capacity of 148.79 mg/g for methylene blue at pH of about 7 and temperature of 25 °C, indicating its promising potential in adsorption application.
      PubDate: 2022-04-01
       
  • Effect of variable thickness cross rolling on edge crack and
           microstructure gradient of AZ31 magnesium alloy

    • Free pre-print version: Loading...

      Abstract: Abstract The hot rolling experiment of AZ31 magnesium alloy was carried out by laying anoverlay mold at the initial temperature of 400 °C. According to the Mizushima automatic plan view pattern control system (MAS) rolling theory and the cross rolling process, different reductions in the middle and edges of the magnesium alloy were realized, and the influence of the regional controlled reduction rolling on the edge cracks and microstructure gradient of the magnesium alloy were analyzed. It is shown that this rolling approach has reduced the maximum edge crack depth of the rolled piece by 56.85%, and there is a weakening tendency in the base surface texture of the strip edge, the base surface texture density drops from 23.97 to 17.48 after ordinary flat rolling. It exhibits basal texture gradients from the edge to the middle of the sheet along the RD direction, which reflected the uneven deformation of the sheets. It is suitable for the processing of metal molds that require large edge reductions such as mobile phone shells, and provided a theoretical basis for the variable thickness rolling of the magnesium alloy strip.
      PubDate: 2022-04-01
       
  • Experimental investigation on mechanical behaviors of granites after
           high-temperature exposure

    • Free pre-print version: Loading...

      Abstract: Abstract To investigate the influence of temperature on the physical, mechanical and acoustic emission characteristics of granites, uniaxial compression test, variable-angle shear test, acoustic emission signal monitoring and the measurement of physical parameters including mass, size and P-wave velocity were carried out on granite samples treated at temperatures T ranging from 25 to 900 ° C. The results show that the density and P-wave velocity decrease gradually with increasing T. As the temperature increases, the peak compressive stress decreases while the peak strain increases, due to the fact that a high temperature induces the escaping of waters within granites, the expanding of mineral grains and the generations of fractures. With the increment of T, both the peak shear stress and the cohesion decrease, whereas the frictional angle increases. During the compressing and shearing tests, the maximum acoustic emission counts show a decreasing trend when T increases from 25 to 900 °C. When T exceeds 573 °C, the crystal lattice structure of quartz changes from α-phase to β-phase, decreasing the mechanical behavior of granites to a great extent. In addition, the results also indicate that T=500–600 °C is the critical temperature ramge to characterize the influence of temperature on the physical, mechanical and acoustic emission characteristics of granites.
      PubDate: 2022-04-01
       
  • Grain boundary effects on spall behavior of high purity copper cylinder
           under sweeping detonation

    • Free pre-print version: Loading...

      Abstract: Abstract A series of sweeping detonation experiments were conducted to study the grain boundary effects during the primary spallation of high-purity copper cylinder. The free surface velocity profile of the shocked samples was measured by Doppler pins systems. The soft-recovered samples were characterized by optical and electron backscatter diffraction microscopy, and the effects of microstructures like grain boundaries, and crystal orientation on spall behavior were investigated. The results indicated that the critical stress of deformation twinning in cylindrical copper increased. The nucleation sites of spallation damage were determined by the joint influence of the grain orientation (Taylor factor) and the angle between grain boundaries and radial impact-stress direction. Voids were prone to nucleating at the grain boundaries perpendicular to the radial impact-stress direction. Nevertheless, the number of voids nucleated at boundaries was relatively different from the results obtained from the plate impact experiment and plate sweeping detonation experiment, which is a result of the curvature that existed in the cylindrical copper and the obliquity of the impact-stress direction during sweeping detonation loading.
      PubDate: 2022-04-01
       
  • Numerical analysis on mixed lubrication performance of journal-thrust
           coupled microgroove bearings with different bottom shapes

    • Free pre-print version: Loading...

      Abstract: Abstract The purpose of the present study is to establish a mixed lubrication model for the journal-thrust coupled microgroove bearings (also referred as coupled bearings) used for the ship shaftless rim-driven thrusters. During the hydrodynamic modelling, the coupling hydrodynamic pressure between the journal bearing and the thrust bearing is considered. The mixed lubrication performances of the microgroove journal-thrust bearing with five different bottom shapes, including rectangle, semi-ellipse, right triangle, isosceles triangle and left triangle, are compared. Based on the numerical results, the optimal microgroove bottom shape of the journal bearing and tilting angle of the thrust pad are determined. Additionally, the comparative analysis shows that the coupled bearing with left triangle microgroove bottom shape exhibits the optimal mixed lubrication performance. The numerical result also indicates that the optimal inclination angle of the thrust bearing pad is 0.01° for the current simulation case.
      PubDate: 2022-04-01
       
  • Extending application of asymmetric semi-circular bend specimen to
           investigate mixed mode I/II fracture behavior of granite

    • Free pre-print version: Loading...

      Abstract: Abstract The asymmetric semi-circular bend (ASCB) specimen has been proposed to investigate the cracking behavior in different geo and construction materials and attracted the attention of researchers due to its advantages. However, there are few studies on the fracture toughness determination of rock materials. In this work, a series of fracture tests were performed with the ASCB specimens made of granite. The onset of fracture, crack initiation angle and crack propagating trajectory was analyzed in detail combined with several mixed mode fracture criteria. The influence of the crack length on the mode I/II fracture toughness was studied. A comparison between the fracture toughness ratios predicted by varying criteria and experimental results was conducted. The relationship between experimentally determined crack initiation angles and curves of the generalized maximum tangential stress (GMTS) criterion was obtained. The fracture process of the specimen was recorded with the high-speed camera. The shortcomings of the ASCB specimens for the fracture toughness determination of rock materials were discussed. The results may provide a reference for analysis of mixed mode I and II fracture behavior of brittle materials.
      PubDate: 2022-04-01
       
  • Experimental investigation on synergetic prediction of granite rockburst
           using rock failure time and acoustic emission energy

    • Free pre-print version: Loading...

      Abstract: Abstract The frequent occurrence of rockburst and the difficulty in predicting were considered in deep engineering and underground engineering. In this work, laboratory experiments on rockburst under true triaxial conditions were carried out with granite samples. Combined with the deformation characteristics of granite, acoustic emission (AE) technology was well applied in revealing the evolution law of micro-cracks in the process of rockburst. Based on the comprehensive analysis of acoustic emission parameters such as impact, ringing and energy, the phased characteristics of crack propagation and damage evolution in granite were obtained, which were consistent with the stages of rock deformation and failure. Subsequently, based on the critical point theory, the accelerated release characteristics of acoustic emission energy during rockburst were analyzed. Based on the damage theory, the damage evolution model of rock under different loading conditions was proposed, and the prediction interval of rock failure time was ascertained concurrently. Finally, regarding damage as an intermediate variable, the synergetic prediction model of rock failure time was constructed. The feasibility and validity of model were verified.
      PubDate: 2022-04-01
       
  • Impact of ultrasonic power on liquid fraction, microstructure and physical
           characteristics of A356 alloy molded through cooling slope

    • Free pre-print version: Loading...

      Abstract: Abstract This study involves A356 alloy molded through ultrasonically vibrated cooling slope. The slope alongside ultrasonic power enables indispensable shear for engendering slurry from which the semisolid cast/heat treated billets got produced. An examination demonstrates ultrasonically vibrated cooling slope influencing the liquid fraction/microstructure/physical characteristics of stated billets. The investigation encompasses five diverse ultrasonic powers (0, 75, 150, 200, 250 W). The ultrasonic power of 150 W delivers finest/rounded microstructure with enhanced physical characteristics. Microstructural modifications reason physical transformations because of grain refinement and grain-boundary/Hall-Petch strengthening. A smaller grain size reasons a higher strength/shape factor and an increased homogeneity reasons a higher ductility. Microstructural characteristics get improved by reheating. It is owing to coalescence throughout temperature homogenization. The physical characteristics is improved by reheating because of a reduced porosity and enhanced dissolution besides augmented homogeneity. A direct comparison remains impossible owing to unavailability of researches on ultrasonically vibrated cooling slope.
      PubDate: 2022-03-31
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 34.231.244.12
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-