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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: 4)
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: 8)
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: 14)
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: 5)
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: 8)
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: 11)
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: 276)
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: 5)
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: 3)
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: 9)
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: 190)
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: 14)
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: 4)
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   (Followers: 1)
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: 5306)
Science & Diplomacy     Free   (Followers: 3)
Science Advances     Free   (Followers: 45)
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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Iranian Journal of Science and Technology, Transactions A : Science
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1028-6276 - ISSN (Online) 2364-1819
Published by Springer-Verlag Homepage  [2468 journals]
  • Optimal Convergence of Thermoelastic Contact Problem Involving Nonlinear
           Hencky-Type Materials with Friction Conditions

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      Abstract: Abstract We study the linear finite element approximation of thermoelastic frictional contact problem. The unilateral contact condition is weakly imposed by the penalty method. Our analysis yields error estimates that are contingent upon the penalty parameter \(\varepsilon\) and the mesh size h. Furthermore, provided the solution maintains regularity, we establish a convergence result.
      PubDate: 2024-08-06
       
  • Numerical Solution of Stochastic Fractional Integro-Differential
           Equations: The Poly-sinc Collocation Approach

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      Abstract: Abstract This paper presents a polynomial sinc-based collocation method, combined with Gauss–Legendre/Newton–Cotes quadrature rules, to solve stochastic fractional integro-differential equations (SFIDEs). The method approximates the solution by applying Lagrangian polynomial interpolation at sinc collocation points and simplifies the SFIDE into a system of algebraic equations, requiring low/moderate computational efforts. The proposed method is also accompanied by an error analysis, and numerical examples are provided to demonstrate its efficiency and accuracy. In noiseless conditions, the method achieves spectral accuracy and behaves like other conventional sinc methods. Finally, the paper simulates an application of a class of these equations.
      PubDate: 2024-08-02
       
  • Variance Estimation in Spatially Balanced Sampling

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      Abstract: Abstract In spatially balanced sampling designs, joint inclusion probabilities for neighborhood units are often zero, or near to zero, because the sampling units tend to be spread across the sample space. In these cases it is difficult to use conventional estimators for the population variance. Alternative estimators, such as the neighborhood-based variance estimators have been introduced. The neighborhood-based variance estimator is recommended for use with Generalized Random Tessellation Stratified designs. In this paper, we review some of the currently available estimators, and introduce others, for use with spatially balanced sampling designs. In a simulation study, the efficiency of the introduced estimators are compared with different estimators under six spatially sampling designs (Balanced Acceptance Sampling, Halton Iterative Partitioning, Generalized Random Tessellation Stratified design, Spatially Correlated Poisson Sampling) and two local pivotal methods. In our simulation study the introduced estimators were more efficient than conventional ones.
      PubDate: 2024-08-01
       
  • A Hybrid Numerical Approach to Solve Multi-singular and Nonlinear
           Emden–Fowler Equations of Fourth Order: HQLMT

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      Abstract: Abstract In this research paper, a novel numerical technique called Hermit-quasilinearization matrix technique (HQLMT) is proposed to acquire the approximate solutions of fourth-order multi-singular and nonlinear Emden–Fowler equations. Firstly, the quasilinearization procedure is utilized for the original model problem followed by the application of a collocation method based on the modified version of Hermite functions to the obtained subequations. After the application of the HQLMT, an algebraic system of linear equations is obtained and this system is solved. Hence, the coefficients of the solution form are determined and the approximate solution is obtained. In addition, the error and convergence analysis are studied for the present method. Finally, it is applied to test examples to explain the method and illustrate the efficiency and accuracy of the HQLMT. Simulation results and comparisons with other existing computational methods show that the presented combined technique is an effective approach.
      PubDate: 2024-08-01
       
  • The Behavior of the Yukawa Potential in the Presence of a Natural Momentum
           Cutoff: An Analytical Study

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      Abstract: Abstract In this paper the Proca field equations for a massive gauge particle are obtained in the presence of a natural momentum cutoff “ \(p_{\max }\) ” based on a covariant generalization of a one-parameter extension of the Heisenberg algebra. The Yukawa potential for a static point source in the presence of \(p_{\max }\) (generalized Yukawa potential) is obtained analytically and it is shown that in contrast with the Yukawa potential for a static point source in Proca electrodynamics, the generalized Yukawa potential has a finite value at the location of the static point source. Our calculations demonstrate that the Coulomb potential, the Yukawa potential, and the Coulomb potential in the presence of \(p_{\max }\) can be derived from the generalized Yukawa poitential. We show that the free space solutions of Proca electrodynamics in the presence of \(p_{\max }\) describe a massive gauge particle with the effective mass \(m_{eff} = \frac{m}{{\sqrt {1 - \left( {\frac{mc}{{p_{\max } }}} \right)^{2} } }}\) , where \(m\) is the rest mass of the ordinary Proca particle. Numerical estimations in Sect. 5, show that the lower bound for \(p_{\max }\) must take the value \(\left( {p_{\max } } \right)_{\min } = (91.187 \pm 0.007)\,\,\frac{GeV}{c}\) in order to avoid complex values for the effective mass \(m_{eff}\) . This lower bound for \(p_{\max }\) is near to the momentum scale of the electroweak interactions. It should be mentioned that for the very large values of \(p_{\max }\) the results of this work reduce to the well-known results of standard Proca electrodynamics.
      PubDate: 2024-08-01
       
  • Influence of Biomass-derived Porous Activated Carbon on Polyaniline as
           Electrode Material for Supercapacitor Applications

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      Abstract: Abstract The investigation focused on the impact of porous activated carbon derived from Sapindus trifoliatus biomass (STAC) in conjunction with a conducting polymer, polyaniline (PA), aimed at achieving high specific capacitance supercapacitors. To create the PA@STAC composites with different weight ratios of STAC (PA@STAC5, PA@STAC10, PA@STAC15, PA@STAC30, PA@STAC50), a practical in situ chemical oxidative polymerization method was employed. The observed improvements in specific capacitance and long-term stability of PA@STAC composites can be attributed to the synergistic effects of both PA and STAC. Consequently, the inclusion of STAC in the composite led to a more than twofold increase in capacitance compared to the original polymers. Specifically, the maximum specific capacitance for the PA@STAC30 composite was 224 F g−1 at a current density of 1 A g−1. The rapid GCD characteristic of PA@STAC30 is attributed to the good porosity and well-organized architecture morphology with short-ion diffusion that allow for free access during the GCD cycles. This study underscores the notable increase in capacitance potential and the enhanced durability of pseudocapacitors achieved through the straightforward addition of a conductive porous carbon material.
      PubDate: 2024-08-01
       
  • Biodiesel Production From High-free Fatty Acids Podocarpus falcatus Oil
           and Identification of Fatty Acid Methyl Esters by FT-IR, NMR (1H and 13C)
           and GC/MS Studies

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      Abstract: Abstract Biodiesel occupies a prominent place as the alternative fuel to fossil diesel owing to socio-economic and environmental factors. In this present study, Podocarpus falcatus oil (PFO), having undergone a storage effect, was converted into biodiesel. PFO had a high fatty acid content (FFA = 8.19%). For this reason, a two-step transesterification procedure was developed to convert these high-free fatty acid (FFA) oils into their corresponding monoesters. In the initial step, an acid-catalyzed esterification was employed to lower the FFA content of the oil to below 2%. Subsequently, a second step involving an alkaline catalysis transesterification process was used to convert the product obtained in the first step into monoesters and glycerol. The methyl esters obtained were analyzed using nuclear magnetic resonance (1H, 13C NMR), Fourier transform infrared spectroscopy (FT-IR), Thermal gravimetric analysis (TGA), carbon, hydrogen, nitrogen, and sulfur (CHNS), and Gas chromatography-mass spectrometry (GC–MS) analysis. The identity FAME were Hexadecanoic acid, methyl ester (C16:0), 9,11-Octadecadienoic acid, methyl ester, (E, E)- (C18:0), 6-Octadecenoic acid, methyl ester, (Z)- (C18:2), Methyl stearate (C18:1), Methyl (Z)-5,11,14,17-eicosatetraenoate (C20:5), 11,14-Eicosadienoic acid, methyl ester (C20:3), 11-Eicosenoic acid, methyl ester (C20:2). The study examined the thermal stability of synthesized biodiesel, revealing it remained stable up to 189 °C. Furthermore, the physicochemical properties of biodiesel were validated using ASTM6751 standards.
      PubDate: 2024-08-01
       
  • Bessel Polynomials: Application in Finding Optimal Solution of Fractional
           COVID-19 Model Using Lagrange Multipliers

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      Abstract: Abstract After the outbreak of coronavirus disease, numerous models have been proposed for it. In this paper, a fractional mathematical model for COVID-19 is introduced. Applying generalized Bessel polynomials, each function in the model is approximated. For minimizing the norm-2 of residual functions, an optimization problem is obtained and this problem is solved using Lagrange multipliers. The numerical results shows that the proposed method has high accuracy and is suitable for solving nonlinear optimization problems and also can help specialists to cure and control Covid-19 disease.
      PubDate: 2024-08-01
       
  • Assessment of Natural Radioactivity in Phosphogypsum Generated in Senegal:
           A Radiological Investigation

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      Abstract: Abstract The concentrations of radioisotopes (238U, 234U, 235U, 210Po, 232Th, 40K, and 226Ra) in naturally occurring radionuclide materials were determined through gamma and alpha spectrometry. The average activities of 226Ra, 232Th, and 40K were matched with literature data from various countries. The radium equivalent value derived is 532.3 Bq kg−1, which exceeds the recommended limit of 370 Bq kg−1 for building materials without restrictions by 43.86%. The mean absorbed dose rate is 245.3 nGy h−1, significantly superior than 57 nGy h−1 reference value. The global annual effective dose, resulting from external radiation exposure and dust inhalation, is 0.3 mSv y−1, below the 1 mSv y−1 limit approved by the International Commission on Radiological Protection for public exposure.
      PubDate: 2024-08-01
       
  • Unidimensional and Bidimensional Beam Expander Effects on the Output Power
           and Spectral Bandwidth of a Dye Laser

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      Abstract: Abstract The effect of two types of beam expanders (prismatic and telescopic) on the output intensity and band width of dye laser has been investigated. The prism beam expander is unidimensional and little cumbersome. Two prism beam expanders were tested. The first, composed of two prisms, could lead to a folded resonator; it was short and gave higher power, but with 9.6 pm bandwidth. The second prism beam expander contained four prisms as well as the resonator was longer, but it could have 0.7 pm bandwidth. Concerning the telescopic two-dimensional beam expander, four different beam expanders were used with expanding ratios: 2X, 5X, 10X and 15X. In each case, the bandwidth, the output power and the wavelength stability were investigated. The 10X telescopic beam expander was the best with 0.7 pm bandwidth and good wavelength stability over 6 h of operation.
      PubDate: 2024-08-01
       
  • Exploring the Different Order of Switches During Multi-switching
           Synchronization

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      Abstract: Abstract The current study explores the concept of generalization of multi-switching synchronization. It contains designing the various orders of switches based on the number of state variables in the drive and response subsystems. The proposed theme is demonstrated using two hyper chaotic systems, namely Chen and Lorenz, with the aid of nonlinear active control. Prior to achieving synchronization, a chaotic analysis is conducted, including the Lyapunov characteristics exponents, fractional dimensions, and dissipativity. The study presents four distinct orders of switches (heterogeneous) and validates the computational results using Mathematica. This research contributes to the understanding of the multi-switching synchronization in broad sense and its potential applications in synchronizing the chaotic systems.
      PubDate: 2024-08-01
       
  • Statistical Warped Products and Their Generalizations in Holomorphic
           Statistical Manifolds

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      Abstract: Abstract In the field of differential geometry and mathematical physics, warped products consistently hold a central position. This paper focuses on the advancement of statistical warped products, where we examine the generic submanifolds in a holomorphic statistical manifold. We expand this exploration to study warped product CR-statistical submanifolds, presenting general inequalities in the statistical context. Subsequently, we make use of the concept of warped product CR-statistical submanifolds to introduce the notion of a twisted product CR-statistical submanifold, along with its extension, the doubly twisted product CR-statistical submanifold. Moreover, we demonstrate that a twisted product CR-statistical submanifold inherently qualifies as a CR-product. Additionally, we conclusively prove that no doubly twisted product CR-statistical submanifolds exist except twisted product CR-statistical submanifolds.
      PubDate: 2024-08-01
       
  • Scleractinian Corals from the Early and Late Aptian of Baghin Area
           

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      Abstract: Abstract From the Early and Late Aptian sediments of the Baghin area, southwest of Kerman, Iran, a fairly low diverse scleractinian coral assemblage is described on the basis of paleoenvironmental factors for the first time. The fauna, collected from 6 stratigraphic horizons, encompasses 21 species from 15 genera, belonging to the families Actinastraeidae, Caryophylliidae, Columastraeidae, Eugyridae, Lasmogyridae, Latomeandridae, Rayasmiliidae, Solenocoeniidae and Stylinidae. The fauna is dominated by low corallite integration forms (plocoid and cerioid arrangements), while highly integrated corals (hydnophoroid, thamnasteroid, meandroid types) and solitary forms are subordinated. In the Baghin section, the δ13C values present a prominent negative excursion followed by a major positive excursion, which is considered geochemically characteristic of Oceanic Anoxic Event 1a (OAE1a). Additionally, the δ18O values suggest a pronounced warming of oceanic waters throughout the studied interval. Although the corals generally had favorable ecological conditions for development, no coral fabric was observed that would suggest biohermal development. The Aptian scleractinian assemblage of the Baghin area exhibits an example of a non-reef-building coral population, that thrived on marly substrate, along the southern rim of the eastern Tethys.
      PubDate: 2024-06-12
      DOI: 10.1007/s40995-024-01655-3
       
  • Nanoclay Montmorillonite-Cross-linked Starch as an Efficient Tool for the
           Controlled Release of Doxorubicin to Cancerous Cells

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      Abstract: Abstract Design and synthesis of novel carriers with properties for controlled release of drugs is an aim for reducing the side effects of the medicines. In this paper, a novel hydrogel is fabricated based on nanoclay montmorillonite-crosslinked starch for the controlled delivery of doxorubicin (DOX) to cancerous cells. The hydrogel is fabricated by the functionalization of starch with methyl methacrylate monomers, followed by cross-linking with methylene bisacrylamide by using nanoclay montmorillonite additive. The composite is characterized by several characterization techniques, including nuclear magnetic resonance and Fourier-transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and thermogravimetric analysis. After the characterization of nanoclay montmorillonite-crosslinked starch nanocomposite, the fabricated hydrogel was evaluated in the delivery of DOX to the cancerous cells. After loading DOX into the hydrogel, the release profile of the drug was obtained in PBS buffer (pH = 7.4). Hemolysis studies proved the compatibility of the hydrogel in red blood cells. Cytotoxicity of DOX-loaded hydrogel was studied against T47D and LNCap cell lines. Cytotoxicity studies showed the activity and applicability of nanoclay montmorillonite-crosslinked starch composite for delivery purposes.
      PubDate: 2024-06-12
      DOI: 10.1007/s40995-024-01622-y
       
  • Identification of Novel Functional Single Nucleotide Polymorphisms in the
           BRCA1 Gene of Breast Cancer Patients

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      Abstract: Abstract Breast cancer is the most common cancer in women, making for one-third of all malignancies in females. Between 40 and 45 percent of instances of hereditary breast cancer are caused by mutations in the breast and ovarian cancer susceptibility gene 1 (BRCA1). Breast cancer risk is raised by mutations in its Really Interesting New Gene (RING) and BRCA1 C-Terminal (BRCT) domains. Thus, the goal of this study was to identify new mutations in the BRCA1 gene's RING and BRCT domains. To examine BRCA1 mutation spectra, 107 patients were chosen who had a documented family history of ovarian or breast cancer. Direct DNA sequencing and single-stranded conformational polymorphism (PCR-SSCP), both based on the polymerase chain reaction, were used to screen for mutations in the RING and BRCT domains of the BRCA1 gene. In-silico analysis was used for the in-vitro research outcome. The study's findings indicated that the population carries several BRCA1 sequence variations, including C.55C > A, C.36A > T, C.60A > T, C.199G > C, C.164A > T, C.251A > G, C.4996T > G, C.5032A > T, C.5041A > G, and C.5291T > A. The Breast Cancer Information Core (BIC) searched and examined the mutations. Every mutation was a new mutation. Additionally, a bioinformatics investigation revealed that several variations had an impact on the pathogenicity and stability of the protein. After calculating the relative risk (RR) of research linked to danger, it was found that there was a strong correlation (RR = 1) between the newly discovered genetic mutations and an elevated risk of breast cancer. Our research emphasizes the value of mutation screening in cases of familial ovarian or breast cancer, as well as the possible ramifications of these results for genetic counseling and cancer prevention.
      PubDate: 2024-06-10
      DOI: 10.1007/s40995-024-01660-6
       
  • A Fractional Order Bazykin’s Predator–Prey System and its
           Solution

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      Abstract: Abstract This paper addresses Bazykin’s prey predator system, which is an ecological model comprising two differential equations for prey and predator species including predator intra-species competition. We study the solution of Bazykin’s predator–prey model of fractional order utilizing the Homotopy Perturbation Method (HPM). Here, the fractional order Bazykin’s model is developed from the integer order counterpart. Additionally, the Holling type-II response function is included in Bazykin’s model, which we have approximated employing Taylor’s polynomial in order to utilise HPM. Extensive numerical simulations are performed for various scenarios. Our numerical findings suggest that few terms of the series solution yield a precise approximate solution. Discussion is held regarding the solutions’ dependence on fractional orders. This method is highly efficient as well as straightforward in analysing this ecological system.
      PubDate: 2024-06-03
      DOI: 10.1007/s40995-024-01646-4
       
  • A Novel Study on q-Fibonacci Sequence Spaces and Their Geometric
           Properties

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      Abstract: Abstract In this study we develop a q-Fibonacci matrix \(\mathcal {F}(q)=(f^q_{nv})_{n,v\in \mathbb {N}_0}\) given by $$\begin{aligned} f^q_{nv}=\left\{ \begin{array}{ccc} q^{v+1}\frac{f_{v+1}(q)}{f_{n+3}(q)-1}&{}, &{} 0\le v\le n, \\ 0 &{}, &{} v>n. \end{array}\right. \end{aligned}$$ where \(\left( f_v(q)\right)\) represents a sequence of q-Fibonacci numbers. By utilizing the matrix \(\mathcal {F}(q)\) , we define matrix domains \(\ell _p (\mathcal {F}(q)):=(\ell _p)_{\mathcal {F}(q)}\) \((0<p< \infty )\) and \(\ell _\infty (\mathcal {F}(q)):=(\ell _\infty )_{\mathcal {F}(q)}\) also known as q-Fibonacci sequence spaces. We obtain Schauder basis for the space \(\ell _p (\mathcal {F}(q))\) and determine Alpha-( \(\alpha\) -), Beta-( \(\beta\) -) and Gamma-( \(\gamma\) -) duals of the newly defined spaces. We obtain some results related to matrix transformations from the spaces \(\ell _p(\mathcal {F}(q))\) and \(\ell _\infty (\mathcal {F}(q))\) to classical sequence spaces \(\ell _\infty ,\) c and \(c_0\) . We also examined some of the geometric properties like approximation property, Dunford–Pettis property, Hahn–Banach extension property, and rotundity of the spaces \(\ell _p(\mathcal {F}(q))\) and \(\ell _\infty (\mathcal {F}(q))\) .
      PubDate: 2024-06-03
      DOI: 10.1007/s40995-024-01644-6
       
  • Physicochemical Characterization and Delignification Enhancement of
           Lignocellulosic Biomass for Sustainable Bioenergy

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      Abstract: Abstract The study provides a thorough examination of the biofuel potential of three unique lignocellulosic crop residues, including rice straw (Oryza sativa), corn stalk (Zea mays), and sugarcane bagasse (Saccharum officinarum) of Odisha. In the investigation, we explored the compositional, thermal, and structural characteristics of these biomass sources to make clear their application for sustainable bioenergy production. Proximate analysis indicated variances in critical factors ranging from 5.9–14.8% (moisture content), 1.8–19.4% (ash content), 60–72.4% (volatile matter), and 9.6–14.7% (fixed carbon). Proximate analysis contributes to the various energy-generating capacities of these materials. An in-depth investigation of cellulose, hemicellulose, and lignin concentration revealed the promise of sugarcane bagasse as a cellulose-rich option for bioethanol synthesis. Thermochemical profiling using thermogravimetric and FTIR analysis revealed information about thermal stability and chemical changes, with pretreatment essential in increasing biomass accessibility and crystallinity. The significance of pretreatment-induced crystallinity for effective enzymatic hydrolysis and fermentable sugar generation was highlighted by X-ray diffraction (XRD). Overall, this study advances our understanding of the intricate relationships between biomass composition, structure, and bioenergy potential, offering valuable insights for developing sustainable biofuel production strategies.
      PubDate: 2024-06-03
      DOI: 10.1007/s40995-024-01651-7
       
  • Nanostructure of Cu2O/SnS Layers Thermally Evaporated: Annealing Effect on
           Structural and Optical Properties

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      Abstract: Abstract Thin film techniques and layers are essential in many industrial applications such as solar cells, gas sensors, photodetectors, etc. In this study, the impact of the annealing process on the structural and optical characteristics of tin sulfide and cuprous oxide (Cu2O NPs/SnS) thin films prepared by thermal evaporation technique onto glass substrates, then annealed at 200 °C was studied to a candidate the layers for solar cell fabrication. X-ray diffraction, surface morphology, and UV–visible measurement characterized the films. After annealing, the average crystal size of Cu2O/SnS nanostructure films decreased from 14 to 12 nm, while the dislocation and micro-strain increased. The SEM images show a uniform and homogeneous distribution after the annealing process and EDX analysis confirmed the elemental stoichiometry of the films. The obtained values of average roughness increased from 0.458 to 0.678 nm, and the root mean square increased from 0.579 to 0.875 nm. The evaluated energy gap of thin films was 1.75 eV for as-deposited and 1.8 eV for annealed films. The surface homogeneity and appropriate energy band gap refer to suitable films for optoelectronics applications.
      PubDate: 2024-06-01
      DOI: 10.1007/s40995-024-01648-2
       
  • Theoretical Study of Energy Band Gap for Chalcogenides Under High Pressure

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      Abstract: Abstract In the present study, we have calculated the energy band gap of some chalcogenides viz. Na2S and Na2Se, using the equation from Angilella et al. (JPCS 121:032006, 2008) to analyze the variation of energy band gap under high pressure with respect to the lattice constant. To determine the pressure, we using some different equation of state viz. Murnaghan EOS, Hama-Suito EOS, Vinet-Rydburg EOS, Birch-Murnaghan EOS and Shanker EOS. The energy band gap of chalcogenide materials similarly behaves like other semiconductors when influenced by high pressure. The result of our calculations for the lattice constant under high pressure indicate that the lattice constant decreases as pressure increases. Furthermore for, Na2S and Na2Se materials at high pressure, our results show that the energy band gap increases as pressure increases for all EOSs.
      PubDate: 2024-06-01
      DOI: 10.1007/s40995-024-01643-7
       
 
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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: 4)
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: 8)
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: 14)
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: 5)
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: 8)
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: 11)
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: 276)
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: 5)
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: 3)
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: 9)
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: 190)
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: 14)
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: 4)
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   (Followers: 1)
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: 5306)
Science & Diplomacy     Free   (Followers: 3)
Science Advances     Free   (Followers: 45)
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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