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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 1 - 200 of 265 Journals sorted alphabetically
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 19)
Acta Nova     Open Access   (Followers: 2)
Acta Scientifica Malaysia     Open Access   (Followers: 1)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
Adıyaman University Journal of Science     Open Access  
Advanced Science     Open Access   (Followers: 16)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 8)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advances in Research     Open Access  
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 12)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 22)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 13)
Anales del Instituto de la Patagonia     Open Access  
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 2)
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 1)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 5)
Archives of Current Research International     Open Access  
ARPHA Conference Abstracts     Open Access   (Followers: 1)
ARPHA Proceedings     Open Access  
Asian Journal of Advanced Research and Reports     Open Access  
Asian Journal of Scientific Research     Open Access   (Followers: 2)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Australian Field Ornithology     Full-text available via subscription   (Followers: 1)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 6)
Bangladesh Journal of Scientific Research     Open Access  
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 11)
Bilge International Journal of Science and Technology Research     Open Access  
Bioethics Research Notes     Full-text available via subscription   (Followers: 15)
BJHS Themes     Open Access   (Followers: 1)
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Bulletin of the National Research Centre     Open Access  
Chain Reaction     Full-text available via subscription  
Ciencia Amazónica (Iquitos)     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia Ergo Sum     Open Access  
Ciência ET Praxis     Open Access  
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Comunicata Scientiae     Open Access  
Conference Papers in Science     Open Access  
Configurations     Full-text available via subscription   (Followers: 11)
COSMOS     Hybrid Journal   (Followers: 1)
Crea Ciencia Revista Científica     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 14)
Current Research in Geoscience     Open Access   (Followers: 6)
Data     Open Access   (Followers: 4)
Dhaka University Journal of Science     Open Access  
Discover Sustainability     Open Access   (Followers: 5)
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Emergent Scientist     Open Access  
Enhancing Learning in the Social Sciences     Open Access   (Followers: 7)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Entramado     Open Access  
Entre Ciencia e Ingeniería     Open Access  
Epiphany     Open Access   (Followers: 1)
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
European Scientific Journal     Open Access   (Followers: 7)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Experimental Results     Open Access   (Followers: 2)
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Fontanus     Open Access   (Followers: 1)
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 249)
Frontiers in Climate     Open Access   (Followers: 5)
Frontiers in Science     Open Access   (Followers: 1)
Fundamental Research     Open Access  
Futures & Foresight Science     Hybrid Journal   (Followers: 1)
Gaudium Sciendi     Open Access  
Ghana Studies     Full-text available via subscription   (Followers: 15)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Globe, The     Full-text available via subscription   (Followers: 4)
HardwareX     Open Access  
Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access   (Followers: 1)
History of Science and Technology     Open Access   (Followers: 6)
Hoosier Science Teacher     Open Access  
Indian Journal of History of Science     Hybrid Journal   (Followers: 3)
Instruments     Open Access  
Interciencia     Open Access  
International Annals of Science     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Applied Science     Open Access  
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 10)
International Science and Technology Journal of Namibia     Open Access   (Followers: 2)
International Scientific and Vocational Studies Journal     Open Access  
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Investigacion y Ciencia     Open Access   (Followers: 1)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
iScience     Open Access   (Followers: 2)
Issues in Science & Technology     Free   (Followers: 8)
Ithaca : Viaggio nella Scienza     Open Access  
J : Multidisciplinary Scientific Journal     Open Access  
Jaunujų mokslininkų darbai     Open Access   (Followers: 3)
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 9)
Journal of Advanced Research     Open Access   (Followers: 2)
Journal of Analytical Science & Technology     Open Access   (Followers: 5)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Journal of Big History     Open Access   (Followers: 4)
Journal of Composites Science     Open Access   (Followers: 4)
Journal of Diversity Management     Open Access   (Followers: 4)
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Institute of Science and Technology     Open Access  
Journal of King Saud University - Science     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Negative and No Positive Results     Open Access  
Journal of Responsible Technology     Open Access  
Journal of Science and Technology     Open Access   (Followers: 2)
Journal of Science and Technology     Open Access   (Followers: 1)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
Journal of Science and Technology Policy Management     Hybrid Journal   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Journal of Scientific Research and Reports     Open Access   (Followers: 1)
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Journal of Social Science Research     Open Access   (Followers: 2)
Journal of Taibah University for Science     Open Access  
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of the History of Ideas     Full-text available via subscription   (Followers: 167)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 4)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 49)
Journal of the South Carolina Academy of Science     Open Access  
Journal of Unsolved Questions     Open Access  
Jurnal Sains Dasar     Open Access  
Jurnal Teknosains     Open Access  
Karaelmas Science and Engineering Journal     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kennedy Institute of Ethics Journal     Full-text available via subscription   (Followers: 10)
Logo STI Science, Technology and Innovation     Open Access   (Followers: 15)
Malawi Journal of Science and Technology     Open Access   (Followers: 6)
Maskana     Open Access  
MethodsX     Open Access  
Mètode Science Studies Journal : Annual Review     Open Access  
Modern Applied Science     Open Access   (Followers: 1)
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
National Academy Science Letters     Hybrid Journal   (Followers: 3)
National Science Review     Hybrid Journal   (Followers: 1)
Natural Sciences     Open Access  
Natural Sciences Education     Hybrid Journal   (Followers: 1)
Naturen     Full-text available via subscription  
Nepal Journal of Science and Technology     Open Access  
Network Science     Hybrid Journal   (Followers: 4)
Nordic Journal of Science and Technology     Open Access   (Followers: 2)
Nordic Studies in Science Education     Open Access   (Followers: 3)
Nova     Open Access  
Open Conference Proceedings Journal     Open Access  
Open Journal of Applied Sciences     Open Access  
Orbis Cógnita : Revista Científica     Open Access   (Followers: 2)
Patterns     Open Access   (Followers: 9)
People and Nature     Open Access   (Followers: 4)
Población y Desarrollo - Argonautas y caminantes     Open Access  
Politique et Sociétés     Full-text available via subscription   (Followers: 1)
Portal de la Ciencia     Open Access  
Proceedings of the Indian National Science Academy     Full-text available via subscription   (Followers: 5)
Proceedings of the Linnean Society of New South Wales     Full-text available via subscription   (Followers: 2)
Proceedings of the Royal Society of Queensland, The     Full-text available via subscription  
QScience Connect     Open Access  
Quantum Science and Technology     Hybrid Journal   (Followers: 15)
Rafidain Journal of Science     Open Access  
Rehabilitation Research, Policy, and Education     Hybrid Journal   (Followers: 2)
Reportes Científicos de la FaCEN     Open Access  
Reports in Advances of Physical Sciences     Open Access  
Research Ideas and Outcomes     Open Access  
Research Integrity and Peer Review     Open Access  
Research Policy : X     Open Access   (Followers: 3)
Respuestas     Open Access  
Revista Bases de la Ciencia     Open Access  
Revista Cientifica Guillermo de Ockham     Open Access  
Revista Conhecimento Online     Open Access  
Revista Crítica de Ciências Sociais     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Universidad del Zulia     Open Access  
Revista Politécnica     Open Access  
Revista Tecnológica     Open Access  
Revista UniVap     Open Access  
SAINSTIS     Open Access  
Sainteknol : Jurnal Sains dan Teknologi     Open Access  
Sci     Open Access  
Science     Full-text available via subscription   (Followers: 5073)
Science & Diplomacy     Free   (Followers: 3)
Science Advances     Free   (Followers: 44)
Science and Technology     Open Access   (Followers: 2)
Science Heritage Journal     Open Access  
Science World Journal     Open Access  
Science, Technology and Arts Research Journal     Open Access   (Followers: 1)
ScienceRise     Open Access  
Sciences du jeu     Open Access  

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Arabian Journal for Science and Engineering
Journal Prestige (SJR): 0.303
Citation Impact (citeScore): 1
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2193-567X - ISSN (Online) 2191-4281
Published by Springer-Verlag Homepage  [2468 journals]
  • Magneto-Hydro-Dynamic Generator with Joule Heating and Viscous
           Dissipation: An Analytic Investigation of Mixed Convection Flow

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      Abstract: Abstract This study investigates mixed convection heat transfer in the vertical channel of magneto-hydro-dynamic (MHD) generators, considering the effects of magnetic fields, Joule heating, and viscous dissipation. The key objectives are to derive an accurate analytical solution for the complex non-linear heat transfer equations and provide insights into optimizing MHD generator design. An innovative mathematical approach involving differential transforms and power series expansions is utilized to solve the coupled partial differential equations. Validation is conducted by comparing results to existing numerical and analytical research. Parametric analysis of dimensionless quantities reveals that increasing the Hartmann number enhances fluid velocity in the channel core but suppresses temperature near the walls due to the magnetic damping effect. Higher Λ (ratio of buoyancy forces to viscous forces) values decrease both velocity and temperature profiles. The magnetic field effectively regulates flow and thermal behavior. Joule heating power rises with a higher Hartmann number but declines as Λ increases due to heightened viscous dissipation. These outcomes elucidate the impacts of critical parameters on heat transfer characteristics and performance. The robust analytical approach and findings pave the pathway for the optimized design of efficient MHD generators. Further work can examine additional configurations and parametric effects to deepen understanding of magneto-hydrodynamic mixed convection phenomena.
      PubDate: 2024-08-01
       
  • Analytical Modeling Methods in Machining: A State of the Art on
           Application, Recent Challenges, and Future Trends

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      Abstract: Abstract Information technology applications are crucial to the proper utilization of manufacturing equipment in the new industrial age, i.e., Industry 4.0. There are certain fundamental conditions that users must meet to adapt the manufacturing processes to Industry 4.0. For this, as in the past, there is a major need for modeling and simulation tools in this industrial age. In the creation of industry-driven predictive models for machining processes, substantial progress has recently been made. This paper includes a comprehensive review of predictive performance models for machining (particularly analytical models), as well as a list of existing models' strengths and drawbacks. It contains a review of available modeling tools, as well as their usability and/or limits in the monitoring of industrial machining operations. The goal of process models is to forecast principal variables such as stress, strain, force, and temperature. These factors, however, should be connected to performance outcomes, i.e., product quality and manufacturing efficiency, to be valuable to the industry (dimensional accuracy, surface quality, surface integrity, tool life, energy consumption, etc.). Industry adoption of cutting models depends on a model's ability to make this connection and predict the performance of process outputs. Therefore, this review article organizes and summarizes a variety of critical research themes connected to well-established analytical models for machining processes.
      PubDate: 2024-08-01
       
  • Effect of Blade number on the Energy Dissipation and Centrifugal Pump
           Performance Based on the Entropy Generation Theory and Fluid–Structure
           Interaction

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      Abstract: Abstract Fluid–structure interactions may impact the precision and reliability of the unsteady flow and rotor deflection investigation in the centrifugal pump. The energy transfer between fluid and solid could disregard due to ignorance of fluid–structure interaction. This study numerically examines a centrifugal pump’s unsteady flow and structural characteristics under varied blade numbers. The entropy generation is computed and simulated numerically, considering the distributions of energy loss in the flow field. ANSYS Fluent and Workbench were employed to simulate the centrifugal pump. The elastic structural dynamic equation is used to predict the structure reaction. The shear stress transport k–ω turbulence model was conducted to simulate the fluid domain. The findings indicated that the head and shaft power increased with the increasing blade numbers at the hydraulic performance. The impeller with seven blades reached the maximum efficiency (78.7%), with an increase of 0.27% relative to the original model. Increasing the number of blades reduces pressure fluctuations at the pump output, and the impeller with nine blades shows a minimum value in pressure amplitude (4960.79 Pa). However, it increases the entropy generation (1.42 W/K) of the centrifugal pump. Variations in blade number affect the distribution and the fluctuation of the equivalent stress and the total deformation. The model with a nine blade exhibited minimum values of equivalent stress and total deformation with 5.74 MPa and 0.046 mm, respectively. This work may improve centrifugal pump operating stability by understanding how blade number affects pump flow and structural behavior and visualizing internal energy loss.
      PubDate: 2024-08-01
       
  • Fast Aerodynamics Prediction of Wedge Tail Airfoils Using Multi-head
           Perceptron Network

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      Abstract: Abstract Wedge tail airfoils refer to the addition of a wedge section to the tail of an airfoil. This modification has demonstrated greater efficiency in increasing the lift forces compared to the base airfoil design. Such airfoils are particularly important in scenarios where increased lift forces are required, such as in the fast and efficient maneuvering of marine and aerospace vehicles. This study aimed to predict the flow fields and aerodynamic coefficients of wedge tail airfoils using a multi-head perceptron (MHP) network and classical machine learning (ML) algorithms, including k-nearest neighbors, decision tree, and random forest. These predictions were based on airfoil sections, x–y grid coordinates, Mach number, and angle of attack, eliminating the need to solve the Navier–Stokes (NS) equations. The database required for training the MHP network and the ML models were generated using the Ansys solver, which solved the NS equations. The results of the models were compared, and it was observed that the MHP network consistently outperformed the others in terms of prediction accuracy. Additionally, the prediction process demonstrated a significant speed improvement of 125 times compared to conventional computational fluid dynamics techniques. Once the training was completed, the flow fields and aerodynamic coefficients for a wedge tail airfoil could be obtained within seconds.
      PubDate: 2024-08-01
       
  • Comprehensive Investigation of Two-Stage Thermoelectric Cooler Parameters
           on Its Performance

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      Abstract: Abstract Due to the poor coefficient of performance and low cooling capacity of thermoelectric coolers, it is necessary to use these coolers in a cascade arrangement. In this regard, two-stage coolers are very important. Considering this, in the present research, the effect of all parameters of a two-stage thermoelectric cooler on its performance was analyzed comprehensively. In this regard, the results of all parameters, including hot and cold temperatures, all geometrical parameters, as well as the thermal parameters related to the contact surface of the two stages, were analyzed analytically on COP, the dissipated heat from the cooler, and its cooling capacity. In carrying out these investigations, for the comprehensiveness of the analysis, a wide range of variation was considered for all parameters, and the optimal range of each of these parameters was reported. Then, the multi-objective optimization of the considered cooler was conducted by simultaneously considering both objective functions, including the cooling capacity and its COP, considering different values of the weighting factor. The distribution of Pareto-optimal point solutions for multi-objective optimization of the cooler was also presented which shows the optimal values of cooling capacity and COP of the cooler for different values of the weighting factor.
      PubDate: 2024-08-01
       
  • Design and Performance Assessment of a Novel Poly-generation System with
           Stable Production of Electricity, Hydrogen, and Hot Water: Energy and
           Exergy Analyses

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      Abstract: Abstract The present investigation proposes an innovative hybrid energy system based on solar energy equipped with a parabolic trough collector, a supercritical CO2 Brayton cycle (SCBC), a recuperative organic Rankine cycle (RORC), a proton exchange membrane electrolyzer (PEME), and a two-tank direct thermal energy storage system. To ensure the stable operation of the system despite fluctuations in the amount of sunlight received during the day, the mass flow rate (MFR) of the heat transfer fluid in the solar collector is regulated to maintain a consistent inlet temperature for the SCBC and RORC. Additionally, the MFR of the HTF from the hot tank to the bottoming cycles also remains constant. This approach allows the entire system to operate around the clock and under stable conditions. The energy and exergy performance of the entire system is evaluated under varying solar irradiance and ambient temperature over a 24-h period. The results revealed that the system could generate 1.5 MW of net power, 4.47 kg of hydrogen per day, and 18.48 kg/s of hot water with a total energy efficiency of 51.30% and exergy efficiency of 55.7%. The solar collector possessed the lowest exergy efficiency of 33.89% due to a high exergy destruction rate. The PEME possessed maximum energy efficiency of 58.85%, followed by RORC and SCBC with 26.38% and 14.84%, respectively. It is concluded the proposed system can provide a reliable and sustainable supply of electricity, hydrogen, and hot water, demonstrating a promising and viable poly-generation technology for both grid-connected and off-grid applications.
      PubDate: 2024-08-01
       
  • Crashworthiness Performance and the Improved Design of Lateral Corrugated
           Tubes Under Axial Impact

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      Abstract: Abstract Lateral corrugated tubes (LCTs) with a sinusoidal cross-section have a wider design space than the ordinary circular tube, which is suitable for design of high performance energy absorbers. To investigate the influence of its structural parameters on crashworthiness, systematic parametric study of the LCTs has been carried out via finite element methods. Results show that LCTs have more deformation modes and more complicated deformations than circular tubes. The amplitude A and the number of corrugations N play a decisive role in the deformation mode and energy absorption. The analysis of different LCTs shows that the specific energy absorption (SEA) of LCTs with (N = 5, A = 3.5 mm) and (N = 7, A = 2.5 mm) increased by 33.68% and 34.97% compared with that of the circular tube, respectively. By changing the basic nominal radius (R0), the SEAs of the LCTs with (N = 6, R0 = 20 mm) and (N = 8, R0 = 18 mm) are 38.33% and 42.66% higher than those of the circular tubes, respectively. The effect of wall thickness on the energy absorption of LCTs was developed. Moreover, the deformation modes of LCTs will be improved by adding ribs inside the structures, significantly increasing its energy absorption. The sinusoidal function is introduced into the structural energy-absorbing design, and structural parameters such as A, N, and R0 can be configured to realize an adjustable and controllable design mechanism. The structural configuration and the design method of LCTs provide a practical reference for the design of energy absorbers.
      PubDate: 2024-08-01
       
  • Optimization for Bending Collapse of Thin-Walled Twelve Right-Angle
           Section Tubes with Variable Thickness

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      Abstract: Abstract This study aimed to investigate the influence of variable thickness on the mechanical properties of thin-walled twelve right-angle section tubes (TTRSTs) through numerical characterization. This paper introduced the TTRSTs with different thicknesses for sides and webs. The three-point bending finite element model correlated with the physical test was built up and modified to find the lowest initial peak force (IPF), maximum specific energy absorption (SEA), and highest mean crushing force (MCF). Effects of variable thickness as well as impact location on the energy absorption performance of TTRSTs were investigated, suggesting that the energy absorption performance was more sensitive to side plate thickness changes than web plate thickness changes in web plate impacts. In addition, the TTRSTs with about 2.5 mm thickness demonstrated the highest SEA. Optimal Latin hypercube design (Opt LHD), response surface method (RSM), and NSGA-II were employed to optimize the TTRST multiobjectively under different impact loadings. The optimized results highlight that the TTRSTs can reach a 46.92% lower initial peak force or 2.61% higher MCF with minor SEA by selecting the appropriate thickness for impacts at different locations.
      PubDate: 2024-08-01
       
  • On Direct Metal Laser Sintering of Functionally Graded Material with
           Virgin and Mixed Powder

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      Abstract: Abstract In the recent past, several studies were reported on meta-structure-based direct metal laser sintering (DMLS) of functionally graded materials (FGM) using virgin/recycled metallic powders. But hitherto little has been reported on DMLS of meta-structure-based FGM using a combination of virgin and mixed metallic powder with a single hopper. This study outlines the use of virgin/single and mixed metallic powder for fabricating FGM using DMLS with a single hopper. The study highlights the DMLS of FGM with 17–4 precipitate hardened (PH) stainless steel (SS) virgin powder in a sandwich layer as ‘Weaire–Phelan’ meta-structure and mixed powder (comprising of 17–4 PH SS (90% by wt.)-Ni-625 (5% by wt.)–Ti–6Al–4V (5% by wt.) collected as waste/mixed powder from DMLS setup) as the top and bottom layers. Results suggested that the surface roughness (Ra) of 3D-printed (by DMLS) FGM was 12.66 µm, 19.85 µm, and 12.41 µm for the top, middle, and bottom layers, respectively. The Ra was improved to 8.59 µm, 12.35 µm, and 8.67 µm after wear testing. Further, after corrosion (in vitro) testing in simulated body fluid, Ra was observed as 13.36 µm, 14.44 µm, and 13.46 µm, respectively. Overall, the wear and corrosive behavior have shown tuneable 4D characteristics for required surface properties in biomedical applications. The results are supported by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) analysis.
      PubDate: 2024-08-01
       
  • Investigation of Bistable Behaviour of Initially Curved Rectangular
           Microplates

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      Abstract: Abstract Electrostatically actuated MEMS plate devices have many potential applications as micro-actuators and highly sensitive sensors. Bistability may occur in microplate devices and it refers to two stable configurations for a single value of actuating load. In this work, bistable behaviour of initially curved rectangular microplates, under the electrostatic and mechanical load actuation, has been investigated. In which detail investigation of bistability in load-deflection equilibrium paths and their associated characteristics, and later, resonance frequency behaviour in bistable regions have been carried out. For this, the governing differential equations of an initially curved rectangular plate have been developed using Kirchhoff’s plate theory, including von Karman nonlinearity. Then, Galerkin’s principle has been used to develop reduced order model of the governing partial differential equation of motion. To validate the results of reduced order model, we have carried out finite element analysis using a software COMSOL Multiphysics. We have observed qualitatively distinct behaviour in bistability characteristics of electrostatically and mechanically actuated microplates. We have also observed high sensitivity near bistability points and these points can be tuned by varying device parameters. This investigation could potentially help design bistable MEMS devices.
      PubDate: 2024-08-01
       
  • Electrical Current-Assisted Low-Plasticity Burnishing of Inconel 718 Built
           by Laser Powder Bed Fusion: Surface Integrity and Fatigue Life Analysis

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      Abstract: Abstract Low-plasticity burnishing (LPB) is usually used for finishing of material to enhance service performance by improving the roughness and inducing compressive residual stress to surface and underneath layers. However, processing of nickel-based superalloys by burnishing is usually challenging because of resistance of material against plastic deformation. Therefore, the material should be burnished following multiple pass that results increase of production time. In the present work, a plausible solution, namely electric-current-assisted burnishing (ECAB), is introduced to be used as post-treatment for Inconel 718 material produced by laser powder bed fusion process. The surface integrity aspects, i.e., roughness, hardness, residual stress, microstructure change and fatigue life after LPB and ECAB under different pass number, were compared by as-built material to identify the efficiency of the introduced methodology. The results indicated that for conventionally burnished sample, after second pass, no more improvement in fatigue life of the sample is observed and even it decreases at third pass. On the other hand, it was found that for the ECABed samples, after only a single pass, the fatigue life and surface integrity aspects reach maximum values of conventionally burnished sample implying ECAB causes reduction of production time to one third. Moreover, it was found that in contrast to conventional burnishing process, in ECAB process, due to electroplasticity effect, contribution of pass number in improvement of fatigue life and surface integrity will be more substantial where continuous enhancement is seen up to three pass. Current is applied to the process, the pass number is more influential fatigue life and surface integrity aspects are.
      PubDate: 2024-08-01
       
  • Thermal Performance Analysis of Twin Pulsating Turbulent Jets Impinging
           over Intermittently Moving Plate

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      Abstract: Abstract This study introduces a novel approach to enhance the thermal performance of a confined slot jet impingement system over a heated plate using multiple pulsating jets. By analyzing the complex fluid flow structure and transport phenomena, resulting from the interaction of the twin jets with the target surface, this research highlights three crucial factors: jet pulsation frequency, phase difference, and intermittent motion of the impingement plate. These factors disrupt the boundary layer, create favorable temperature and velocity gradients, and improve heat transfer rates. The velocity vector field analysis reveals the generation of vortices in multiple regions due to the coherent pulsatile jet. The study concludes that increasing the jet pulsation frequency beyond the critical value corresponding to a Strouhal number = 0.26 improves heat removal rate from the isothermal plate. Interestingly, the phase difference promotes heat transport only when the plate is stationary but loses its beneficial effect during intermittent motion. Phase difference results in a 6.7% improvement in average Nusselt number at a jet pulsation frequency of 40 Hz with a stationary plate, particularly benefiting lower frequency pulsating flows. Non-uniform plate motion exhibits the strongest influence on the heat transfer process among the investigated factors. Optimal thermal energy exchange requires careful adjustment of these factors. For instance, when both jet pulsation and intermittent plate motion frequencies are set to 100 Hz, convective heat transfer improves by up to 48% compared to the steady-state scenario, regardless of the phase difference. These findings may benefit the design and optimization of jet impingement-based thermal management systems.
      PubDate: 2024-08-01
       
  • Evolution of Iron-Based Metallic Glass Composite Coating with Enhanced
           Corrosion Resistance and Biocompatibility

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      Abstract: Abstract Metallic glasses are a new class of metallic alloys that attract increasing attention in bone implants due to their ultrahigh wear resistance and hardness, high toughness and superior strength. However, their cytotoxicity and biocorrosion resistance are still under investigation. In this research, the cytotoxicity and biocorrosion resistance of iron-based metallic glass composite coating are explored. To approach real-life conditions, the biocorrosion resistance of the proposed coating in phosphate buffer saline (PBS) is evaluated via immersion test for 30 days followed by an electrochemical corrosion test. Then, human bone cells (MG-63) are cultured on corroded samples and the cell viability is determined using MTT assay, in addition to cell attachment examination. The results revealed the formation of a metallic glass composite layer with 78.76% amorphous content. Additionally, the metallic glass composite demonstrated excellent and stable corrosion resistance in PBS over 30 days compared to the substrate. The MTT assay has shown that the cytotoxicity of iron-based metallic glass composite is within the permitted levels according to ISO 10993–5, Part 5 vol 2009. The cells were well attached to the surface besides, showing a healthy growth after 7 days of culture. These results confirm the in vitro biocompatibility of iron-based metallic glass composite coating for biomedical implant applications.
      PubDate: 2024-08-01
       
  • An Experimental and Computational Investigation on Fluid Flow and Thermal
           Performance of a Rhombus Passage Solar Air Heater of Various
           Configurations

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      Abstract: Abstract The experimental and numerical findings of fluid flow and thermal characteristics of rhombus passage solar air heater (SAH) over Reynolds number range 5000–28000 are reported in this article. In this comprehensive investigation, seven models of rhombus-ducts are obtained by modifying the sharp corners with arc-shaped corners. The models include: No curvature at duct corners; Curvature at top corner; bottom corner; left or right corner; both left and right corners; both top and bottom corners; all four corners. Out of these seven models, the best one is chosen, and is further investigated by including the roughness elements, such as dimples, rectangular ribs on the absorber plate of SAH. In these models with roughness elements (Model-8 and Model-9), the roughness parameters are varied, and further investigations are carried out. Three-dimensional computational simulations are performed by using the ANSYS Fluent. Also, experiments are conducted with a few SAH duct variants to validate the numerical results. To gain confidence in the results obtained, validation is done against the standard correlation and literature data. The influence of operating parameters on Nusselt number, friction factor, and air temperature at duct outlet is investigated. It is found that the model with all arc-shaped corners is the best out of Model-1 to Model-7. In addition, the rhombus duct Model-9 (with all corners possessing arcs and rectangular ribs of height 5 mm on the absorber plate, Pl/e = 10) is the greatest choice, showing an enrichment in bulk temperature of 127.5% compared to simple rhombus duct SAH.
      PubDate: 2024-08-01
       
  • Waste Heat and Mass Recovery from Boiler Exhaust Gases in a New Generation
           District Heating System: Energy and Exergy Analysis

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      Abstract: Abstract The study performs energy and exergy analyses for each component such as boilers, buildings, distribution networks and heat exchangers of a new generation district heating system. Energy and exergy efficiencies are compared for all system components, and energy and exergy losses are presented using Sankey and Grassman diagrams. Three flue gas condensers with finned bundles are designed for different capacities of boilers that intend to recover water and heat from the waste flue gas in the district heating system due to high flue gas energy losses. Colburn-Hougen and one-dimensional finite difference methods are used to design the flue gas condensers with the MATLAB program. The exergy analysis showed that the exergy input to the system is lost by 4.52% from the distribution networks, 4.15% from all buildings and 2.18% from the flue gas. In the system, the energy and exergy efficiencies of the boilers are calculated to be 87.23% and 17.32%, respectively, and the heat loss from the flue gas is found to be 12%. The design results show that the values of mass convection coefficient (km) for all flue gas condensers decrease from 0.0706 at the inlet condensation zone to 0.0354 towards the outlet. The total condensation rate and condensation efficiency are found to be 86 kg/h and 60%, respectively, for the 2500 kW boiler.
      PubDate: 2024-08-01
       
  • Improvement of the Unequal Division Shear Zone Model Based on Sensitivity
           Analysis and Classification of Uncertain Parameters

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      Abstract: Abstract Inversion of relevant parameters of cutting analysis model through experimental data is an effective method to improve the prediction accuracy of the model. In view of the present situation that the prediction accuracy of the unequal division shear zone model needs to be improved and there are a large number of uncertain parameters that need to be inversed, a method of sensitivity analysis and classification of the uncertain parameters of the model is proposed to reduce the number of parameters that need to be inversed, and the model is improved. Firstly, the Sobol method is used to analyze the global sensitivity of 10 uncertain parameters such as the shear zone thickness h, Taylor–Quinney coefficient μ and JC parameters of the unequal division shear zone model. According to the analysis results, they are divided into sensitive parameters and insensitive parameters. Then, the sensitive parameters are inversed by genetic algorithm using experimental data. Finally, the sensitive parameters are substituted into the unequal division shear zone model to improve the prediction accuracy of the model. When the workpiece material is Al 6061-T6 and 42CrMo4 steel, the uncertain parameters that need to be inversed determined by this method are reduced from 10 to 4 and 3, respectively. The verification results show that the prediction accuracy of the main cutting force and feed force of the improved model for orthogonal cutting Al 6061-T6 workpiece and 42CrMo4 steel workpiece is much higher than that of the original model.
      PubDate: 2024-08-01
       
  • Two-Phase Numerical Simulation for the Heat and Mass Transfer Evaluation
           Across a Vertical Deformable Sheet with Significant Impact of Solar
           Radiation and Heat Source/Sink

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      Abstract: Abstract The growing need for industrial development, limited availability of non-renewable energy resources, minimizing energy consumption, and ecosystem concerns has prompted researchers to explore the practical applications of two-phase nanofluid materials processing and electromagnetic energy emitted via the sun. Therefore, using two-phase nanofluids in solar thermal technology systems can enhance system performance by improving heat absorption and transfer efficiency. Owing to its usage, this study examines the magnetized two-phase nanofluid flow on a two-dimensional laminar mixed convective boundary layer with the impact of multiple slips. The flow contains an electrically conducting non-Newtonian nanofluid over a deformable (stretching/shrinking) sheet with a solar radiation effect. Also, the study utilizes a nonlinear Roseland diffusion flux approximation to incorporate the solar radiation effect, which is valid for nanofluid media with high optical density. This work utilizes similarity variables to simplify the partial derivative model into ordinary differential equations. These equations are then solved using the wavelets and Chebyshev wavelets scheme with the help of MATHEMATICA 11.3 software. According to the findings, the nanoparticle volume fraction is increased for high electrical conductivity (M = 2) and decreased for the electrically non-conducting case (M = 0).
      PubDate: 2024-08-01
       
  • Nanostructured Al–Ti–Fe–Mn–Ni High-Entropy Alloy by Mechanical
           Alloying: Synthesis and Characterization

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      Abstract: Abstract A multicomponent bulk nanostructured Al20Ti20Fe20Mn20Ni20 high-entropy alloy (HEA) was prepared by the powder metallurgy method. The process involved mechanical alloying of the elemental powders of equal wt% followed by cold compaction and conventional sintering in an inert atmosphere at different temperatures. The structural evaluation and morphological studies of the milled powders were carried out by HRTEM and XRD analysis. The crystal size and d-spacing of the milled powder significantly reduced with the milling duration. The effects of sintering temperatures on the microstructure, wear resistance, and the hardness of Al20Ti20Fe20Mn20Ni20 were investigated. The microstructural analysis showed that the prepared HEAs had a multiphase microstructure consisting of BCC and intermetallic compounds. As the sintering temperature grew, the microhardness and wear resistance increased, demonstrating that the properties of the current HEA were improved by using high sintering temperatures. The increase in density with sintering temperatures and the intermetallic phase contents acted as reinforcement might have enhanced the hardness of the HEA. The best hardness value and the least amount of wear were found in the sample sintered at 900 °C.
      PubDate: 2024-08-01
       
  • The Effects of EGR and Oxygen Content on the GCI Engine Performance Under
           Two-Injection Modes and Fueled Biodiesel Blends

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      Abstract: Abstract When compared to other internal combustion engine types (SI engine, CI engine), the gasoline compression ignition engine (GCI engine) offers a promising and efficient way to enhance heat efficiency and less harmful emissions. The development of new engine technologies is aimed at optimizing the performance of GCI engines by allowing them to operate more efficiently at part load and using lower octane gasoline fuel under higher compression ratios. The GCI engine struggles to cope with a large amount of smoke, soot, HC and CO, and it is not very stable when operating at a low load or when it is exposed to high load conditions, which can cause autoignition. This study will introduce certain technologies, such the strategy for dealing with exhaust gas recirculation (EGR) and oxygen content, that assist in resolving the issues faced by the GCI engine. The research results show that the ignition delay tends to decrease with an increase in EGR. The ignition delay reaches its minimum value at 20% EGR with GB05 fuel. The maximum pressure in the combustion chamber of a GB05-fueled engine can be improved at 20% EGR. The engine's thermal efficiency and NOx emissions decrease, while CO and HC emissions increase with increasing EGR. The increase in oxygen content led to a decrease in ignition delay and lift-off length.
      PubDate: 2024-08-01
       
  • Feasibility of Waste Fat Chicken Biodiesel–Diesel Blend in Modern
           Common-Rail Direct Injection (CRDI) Turbocharged Diesel Engine: A
           Potential Study of Saudi Arabia

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      Abstract: Abstract The Kingdom of Saudi Arabia (KSA) is facing extreme gas emissions challenges in the energy and transport sector. So, it is always preferred to use fuels that should be derived from waste to energy resources that are available abundantly without harmful environmental emissions. This experimental study uses neat diesel, and waste fat chicken oil blends to investigate the performance and emissions parameters in high-pressure common-rail multi-cylinder diesel engines. The tested fuel blends are prepared with the ratios of 10% biodiesel–diesel 90% (DB10), 15% biodiesel–diesel 85% (DB15), and 20% biodiesel–diesel 80% (DB20). The experimental results showed that, at 2000 rpm, torque and brake power produced by DB10 is 7.93% and 6.1% greater than the other diesel fuel due to its high heating value and density. The decrease in CO (16.66%), CO2 (10.79%), and HC (10.79%) emissions of DB10 compared to other diesel fuels was due to better ignition quality, higher oxygen content, and proper combustion. DB10 showed a slight increase in NOx emission (0.39%) compared to DF. Therefore, it is concluded from the performance and emission results that the DB10 is the most suitable alternative fuel compared to diesel, DB15, and DB20, and it can be used in the KSA without any modification in diesel engines.
      PubDate: 2024-08-01
       
 
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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 1 - 200 of 265 Journals sorted alphabetically
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 19)
Acta Nova     Open Access   (Followers: 2)
Acta Scientifica Malaysia     Open Access   (Followers: 1)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
Adıyaman University Journal of Science     Open Access  
Advanced Science     Open Access   (Followers: 16)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 8)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advances in Research     Open Access  
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 12)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 22)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 13)
Anales del Instituto de la Patagonia     Open Access  
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 2)
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 1)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 5)
Archives of Current Research International     Open Access  
ARPHA Conference Abstracts     Open Access   (Followers: 1)
ARPHA Proceedings     Open Access  
Asian Journal of Advanced Research and Reports     Open Access  
Asian Journal of Scientific Research     Open Access   (Followers: 2)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Australian Field Ornithology     Full-text available via subscription   (Followers: 1)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 6)
Bangladesh Journal of Scientific Research     Open Access  
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 11)
Bilge International Journal of Science and Technology Research     Open Access  
Bioethics Research Notes     Full-text available via subscription   (Followers: 15)
BJHS Themes     Open Access   (Followers: 1)
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Bulletin of the National Research Centre     Open Access  
Chain Reaction     Full-text available via subscription  
Ciencia Amazónica (Iquitos)     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia Ergo Sum     Open Access  
Ciência ET Praxis     Open Access  
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Comunicata Scientiae     Open Access  
Conference Papers in Science     Open Access  
Configurations     Full-text available via subscription   (Followers: 11)
COSMOS     Hybrid Journal   (Followers: 1)
Crea Ciencia Revista Científica     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 14)
Current Research in Geoscience     Open Access   (Followers: 6)
Data     Open Access   (Followers: 4)
Dhaka University Journal of Science     Open Access  
Discover Sustainability     Open Access   (Followers: 5)
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Emergent Scientist     Open Access  
Enhancing Learning in the Social Sciences     Open Access   (Followers: 7)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Entramado     Open Access  
Entre Ciencia e Ingeniería     Open Access  
Epiphany     Open Access   (Followers: 1)
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
European Scientific Journal     Open Access   (Followers: 7)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Experimental Results     Open Access   (Followers: 2)
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Fontanus     Open Access   (Followers: 1)
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 249)
Frontiers in Climate     Open Access   (Followers: 5)
Frontiers in Science     Open Access   (Followers: 1)
Fundamental Research     Open Access  
Futures & Foresight Science     Hybrid Journal   (Followers: 1)
Gaudium Sciendi     Open Access  
Ghana Studies     Full-text available via subscription   (Followers: 15)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Globe, The     Full-text available via subscription   (Followers: 4)
HardwareX     Open Access  
Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access   (Followers: 1)
History of Science and Technology     Open Access   (Followers: 6)
Hoosier Science Teacher     Open Access  
Indian Journal of History of Science     Hybrid Journal   (Followers: 3)
Instruments     Open Access  
Interciencia     Open Access  
International Annals of Science     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Applied Science     Open Access  
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 10)
International Science and Technology Journal of Namibia     Open Access   (Followers: 2)
International Scientific and Vocational Studies Journal     Open Access  
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Investigacion y Ciencia     Open Access   (Followers: 1)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
iScience     Open Access   (Followers: 2)
Issues in Science & Technology     Free   (Followers: 8)
Ithaca : Viaggio nella Scienza     Open Access  
J : Multidisciplinary Scientific Journal     Open Access  
Jaunujų mokslininkų darbai     Open Access   (Followers: 3)
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 9)
Journal of Advanced Research     Open Access   (Followers: 2)
Journal of Analytical Science & Technology     Open Access   (Followers: 5)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Journal of Big History     Open Access   (Followers: 4)
Journal of Composites Science     Open Access   (Followers: 4)
Journal of Diversity Management     Open Access   (Followers: 4)
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Institute of Science and Technology     Open Access  
Journal of King Saud University - Science     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Negative and No Positive Results     Open Access  
Journal of Responsible Technology     Open Access  
Journal of Science and Technology     Open Access   (Followers: 2)
Journal of Science and Technology     Open Access   (Followers: 1)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
Journal of Science and Technology Policy Management     Hybrid Journal   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Journal of Scientific Research and Reports     Open Access   (Followers: 1)
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Journal of Social Science Research     Open Access   (Followers: 2)
Journal of Taibah University for Science     Open Access  
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of the History of Ideas     Full-text available via subscription   (Followers: 167)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 4)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 49)
Journal of the South Carolina Academy of Science     Open Access  
Journal of Unsolved Questions     Open Access  
Jurnal Sains Dasar     Open Access  
Jurnal Teknosains     Open Access  
Karaelmas Science and Engineering Journal     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kennedy Institute of Ethics Journal     Full-text available via subscription   (Followers: 10)
Logo STI Science, Technology and Innovation     Open Access   (Followers: 15)
Malawi Journal of Science and Technology     Open Access   (Followers: 6)
Maskana     Open Access  
MethodsX     Open Access  
Mètode Science Studies Journal : Annual Review     Open Access  
Modern Applied Science     Open Access   (Followers: 1)
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
National Academy Science Letters     Hybrid Journal   (Followers: 3)
National Science Review     Hybrid Journal   (Followers: 1)
Natural Sciences     Open Access  
Natural Sciences Education     Hybrid Journal   (Followers: 1)
Naturen     Full-text available via subscription  
Nepal Journal of Science and Technology     Open Access  
Network Science     Hybrid Journal   (Followers: 4)
Nordic Journal of Science and Technology     Open Access   (Followers: 2)
Nordic Studies in Science Education     Open Access   (Followers: 3)
Nova     Open Access  
Open Conference Proceedings Journal     Open Access  
Open Journal of Applied Sciences     Open Access  
Orbis Cógnita : Revista Científica     Open Access   (Followers: 2)
Patterns     Open Access   (Followers: 9)
People and Nature     Open Access   (Followers: 4)
Población y Desarrollo - Argonautas y caminantes     Open Access  
Politique et Sociétés     Full-text available via subscription   (Followers: 1)
Portal de la Ciencia     Open Access  
Proceedings of the Indian National Science Academy     Full-text available via subscription   (Followers: 5)
Proceedings of the Linnean Society of New South Wales     Full-text available via subscription   (Followers: 2)
Proceedings of the Royal Society of Queensland, The     Full-text available via subscription  
QScience Connect     Open Access  
Quantum Science and Technology     Hybrid Journal   (Followers: 15)
Rafidain Journal of Science     Open Access  
Rehabilitation Research, Policy, and Education     Hybrid Journal   (Followers: 2)
Reportes Científicos de la FaCEN     Open Access  
Reports in Advances of Physical Sciences     Open Access  
Research Ideas and Outcomes     Open Access  
Research Integrity and Peer Review     Open Access  
Research Policy : X     Open Access   (Followers: 3)
Respuestas     Open Access  
Revista Bases de la Ciencia     Open Access  
Revista Cientifica Guillermo de Ockham     Open Access  
Revista Conhecimento Online     Open Access  
Revista Crítica de Ciências Sociais     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Universidad del Zulia     Open Access  
Revista Politécnica     Open Access  
Revista Tecnológica     Open Access  
Revista UniVap     Open Access  
SAINSTIS     Open Access  
Sainteknol : Jurnal Sains dan Teknologi     Open Access  
Sci     Open Access  
Science     Full-text available via subscription   (Followers: 5073)
Science & Diplomacy     Free   (Followers: 3)
Science Advances     Free   (Followers: 44)
Science and Technology     Open Access   (Followers: 2)
Science Heritage Journal     Open Access  
Science World Journal     Open Access  
Science, Technology and Arts Research Journal     Open Access   (Followers: 1)
ScienceRise     Open Access  
Sciences du jeu     Open Access  

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