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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 1 - 200 of 265 Journals sorted alphabetically
AAS Open Research     Open Access   (Followers: 1)
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 18)
Acta Materialia Transilvanica     Open Access  
Acta Nova     Open Access   (Followers: 1)
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: 13)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 6)
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: 8)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 21)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 13)
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 1)
Anales del Instituto de la Patagonia     Open Access  
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 2)
Apuntes de Ciencia & Sociedad     Open Access  
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  
ARO. The Scientific Journal of Koya University     Open Access  
ARPHA Conference Abstracts     Open Access   (Followers: 1)
ARPHA Proceedings     Open Access  
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     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: 2)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 6)
Avrasya Terim Dergisi     Open Access  
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)
BIBECHANA     Open Access  
Bilge International Journal of Science and Technology Research     Open Access  
Bioethics Research Notes     Full-text available via subscription   (Followers: 16)
BJHS Themes     Open Access  
Black Sea Journal of Engineering and Science     Open Access  
Borneo Journal of Resource Science and Technology     Open Access  
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Bulletin of the National Research Centre     Open Access  
Butlletí de la Institució Catalana d'Història Natural     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  
Ciencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Citizen Science : Theory and Practice     Open Access   (Followers: 2)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Applied Sciences     Open Access  
Comunicata Scientiae     Open Access  
ConCiencia     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  
Cuadernos de Investigación UNED     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 13)
Current Research in Geoscience     Open Access   (Followers: 5)
Dalat University Journal of Science     Open Access  
Data     Open Access   (Followers: 4)
Data Curation Profiles Directory     Open Access   (Followers: 9)
Dhaka University Journal of Science     Open Access  
Diálogos Interdisciplinares     Open Access  
Digithum     Open Access   (Followers: 2)
Discover Sustainability     Open Access   (Followers: 3)
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Elkawnie : Journal of Islamic Science and Technology     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)
Estação Científica (UNIFAP)     Open Access  
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
Ethiopian Journal of Science and Technology     Open Access  
Ethiopian Journal of Sciences and Sustainable Development     Open Access  
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
European Scientific Journal     Open Access   (Followers: 5)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Experimental Results     Open Access   (Followers: 1)
Facets     Open Access  
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Fırat University Turkish Journal of Science & Technology     Open Access  
Fontanus     Open Access   (Followers: 2)
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 237)
Frontiers for Young Minds     Open Access  
Frontiers in Climate     Open Access   (Followers: 4)
Frontiers in Science     Open Access   (Followers: 1)
Fundamental Research     Open Access  
Futures & Foresight Science     Hybrid Journal   (Followers: 1)
Gaudium Sciendi     Open Access  
Gazi University Journal of Science     Open Access  
Ghana Studies     Full-text available via subscription   (Followers: 15)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Global Journal of Science Frontier Research     Open Access   (Followers: 1)
Globe, The     Full-text available via subscription   (Followers: 4)
HardwareX     Open Access  
Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access  
Himalayan Journal of Science and Technology     Open Access  
History of Science and Technology     Open Access   (Followers: 5)
Hoosier Science Teacher     Open Access  
Impact     Open Access   (Followers: 1)
Indian Journal of History of Science     Hybrid Journal  
Indonesian Journal of Fundamental Sciences     Open Access  
Indonesian Journal of Science and Mathematics Education     Open Access   (Followers: 2)
Indonesian Journal of Science and Technology     Open Access  
Ingenieria y Ciencia     Open Access   (Followers: 1)
Innovare : Revista de ciencia y tecnología     Open Access  
Instruments     Open Access  
Integrated Research Advances     Open Access  
Interciencia     Open Access  
Interface Focus     Full-text available via subscription  
International Annals of Science     Open Access  
International Archives of Science and Technology     Open Access  
International Journal of Academic Research in Business, Arts & Science     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Applied Science     Open Access  
International Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
International Journal of Computational and Experimental Science and Engineering (IJCESEN)     Open Access  
International Journal of Culture and Modernity     Open Access   (Followers: 2)
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Engineering, Technology and Natural Sciences     Open Access  
International Journal of Innovation and Applied Studies     Open Access   (Followers: 4)
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 1)
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access  
International Journal of Research in Science     Open Access   (Followers: 1)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 8)
International Letters of Social and Humanistic Sciences     Open Access  
International Science and Technology Journal of Namibia     Open Access   (Followers: 1)
International Scientific and Vocational Studies Journal     Open Access  
InterSciencePlace     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: 1)
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 10)
Journal of Advanced Research     Open Access   (Followers: 2)
Journal of Al-Qadisiyah for Pure Science     Open Access  
Journal of Alasmarya University     Open Access  
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 Integrated Science and Technology     Open Access  
Journal of King Saud University - Science     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Natural Sciences Research     Open Access   (Followers: 2)
Journal of Negative and No Positive Results     Open Access  
Journal of Responsible Technology     Open Access  
Journal of Science (JSc)     Open Access  
Journal of Science and Engineering     Open Access   (Followers: 1)
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 Science of the University of Kelaniya Sri Lanka     Open Access  
Journal of Scientific Research     Open Access   (Followers: 1)
Journal of Scientific Research and Reports     Open Access   (Followers: 1)
Journal of Scientometric Research     Open Access   (Followers: 21)
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 Asiatic Society of Bangladesh, 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: 157)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 4)
Journal of the National Science Foundation of Sri Lanka     Open Access  
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 48)
Journal of the South Carolina Academy of Science     Open Access  
Journal of Unsolved Questions     Open Access  
Jurnal Ilmiah Ilmu Terapan Universitas Jambi : JIITUJ     Open Access  
Jurnal Matematika, Sains, Dan Teknologi     Open Access  

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Acta Nova
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Online) 1683-0789
Published by SciELO Homepage  [688 journals]
  • Editorial

    •  
  • Aplicación de activadores biológicos en dos tipos de compostaje para la
           degradación de residuos orgánicos, Carmen Pampa, Coroico - Bolivia

    • Abstract: Resumen: Uno de los problemas que actualmente se suscitan en centros urbanos y rurales es la generación de basuras domésticas de un 80%. En el Municipio de Coroico hasta la fecha operativamente no cuenta con sistemas de descomposición el cual genera efectos negativos en el medio ambiente. Razón por la cual es necesario buscar alternativas de reutilización de basuras orgánicas. Es en ese sentido, el [Objetivo]: del trabajo fue evaluar la aplicación de activadores biológicos (yogurt, levadura) y un control (testigo) para acelerar la biodegradación de residuos orgánicos (restos de cocina, aserrín, cogollos de plátano, rastrojos vegetales y estiércol de cerdo) a través de dos métodos de compostaje en cajón y en pila en la descomposición. [Metodología] Se emplearon dos tipos de compostera (cajón y pila) a los cuales se adicionó desechos orgánicos. A cada uno de ellos, se agregó activadores biológicos (yogurt y levadura) y un control. El diseño aplicado fue DBA con arreglo bifactorial, con tres repeticiones. Las variables evaluadas son: temperatura y pH del sustrato, descenso del sustrato y porcentaje de descomposición. [Resultados]: La temperatura del sustrato por efecto de los activadores de yogurt y levadura se incrementó a 60ºC con relación al control. El pH y la altura del sustrato presentaron un similar comportamiento entre activadores no ocurriendo lo mismo con el control. Al cabo de 90 días, los dos tipos de activadores fueron más eficientes en la descomposición del compost en 93% y 94% que sin estos (56%). [Conclusión] La descomposición de restos orgánicos fue efectiva por la aplicación de los activadores (yogurt y levadura) que, en ausencia de estos, y el tipo de compostera cajón fue la más efectiva en la descomposición. : One of the problems that currently arise in urban and rural centers is the generation of 80% domestic waste. In the Municipality of Coroico, to date, it does not have operational decomposition systems, which generate negative effects on the environment. Reason why it is necessary to look for alternatives for the reuse of organic waste. In this sense, the [Objective]: of the work was to evaluate the application of biological activators (yogurt, yeast) and a control (control) to accelerate the biodegradation of organic waste (kitchen scraps, sawdust, banana buds, vegetable stubble and pig manure) through two methods of composting in bin and pile in decomposition. [Methodology] Two types of compost bins (drawer and pile) were used, to which organic waste was added. Biological activators (yogurt and yeast) and a control were added to each of them. The applied design was DBA with bifactorial arrangement, with three repetitions. The variables evaluated are: temperature and pH of the substrate, decrease in the substrate and percentage of decomposition. [Results]: The temperature of the substrate due to the effect of the yogurt and yeast activators increased to 60ºC in relation to the control. The pH and the height of the substrate presented a similar behavior between activators, but the same did not occur with the control. After 90 days, the two types of activators were 93% and 94% more efficient in compost decomposition than without them (56%). [Conclusion] The decomposition of organic remains was effective by the application of activators (yogurt and yeast) which, in the absence of these, and the type of drawer composter was the most effective in decomposition.
       
  • Estudio comparativo de los algoritmos de criptografía simétrica
           AES, 3DES y ChaCha20

    • Abstract: Resumen: El constante avance de la tecnología incrementa cada vez más la dependencia del internet y el envío de información a través de la misma, aumenta también la necesidad de seguridad en la red y los dispositivos conectados a ella. Para mantener la seguridad de toda esta información se crearon los algoritmos de encriptación, los cuales están encargados de cifrar los datos de modo que sólo quienes estén autorizados puedan entenderlos. Las crecientes amenazas de seguridad han forzado la creación continua de distintos algoritmos de encriptación, recientemente se introdujo el algoritmo ChaCha20 que trata de sustituir a su predecesor el Salsa20, el cual era considerablemente rápido y bastante confiable respecto a su seguridad. El ChaCha20 promete aumentar la difusión respecto a su predecesor para mejorar su seguridad sin comprometer su rendimiento. Sin embargo, poco se sabe de su eficiencia en comparación a los otros algoritmos, lo cual limita una decisión racional al momento de elegir si utilizarlo o no. Este artículo presenta un estudio empírico en el cual comparamos el rendimiento de ChaCha20 con otros dos algoritmos de encriptación AES, y 3DES. En este artículo evaluamos el tiempo de ejecución, consumo de CPU y consumo de energía que toma cada uno de los algoritmos para encriptar y des-encriptar información. Se desarrolló un experimento con 150 archivos de distintos formatos y tamaños para probar cada algoritmo. Se determinó que el algoritmo ChaCha20 es el más rápido, AES es el que menos CPU consume y no existe diferencia significativa en el consumo de energía de ninguno de los algoritmos. : The constant advancement of technology increases the dependence on the Internet and the sending of information through it, it also increases the need for security in the network and the devices connected to it. To maintain the security of all this information, encryption algorithms were created, which are in charge of encrypting the data so that only those who are authorized can understand it. The increasing security threats have forced the continuous creation of different encryption algorithms, recently the ChaCha20 algorithm was introduced, which tries to replace its predecessor, Salsa20, which was considerably fast and quite reliable regarding its security. The ChaCha20 promises to increase the spread compared to its predecessor to improve its security without compromising its performance. However, little is known about its efficiency compared to other algorithms, which limits a rational decision when choosing whether to use it or not. This article presents an empirical study in which we compared the performance of ChaCha20 with two other encryption algorithms AES, and 3DES. In this article we evaluate the execution time, CPU consumption and energy consumption that each of the algorithms take to encrypt and decrypt information. An experiment with 150 files of different formats and sizes was developed to test each algorithm. It was determined that the ChaCha20 algorithm is the fastest, AES is the one that consumes the least CPU and there is no significant difference in the power consumption of any of the algorithms.
       
  • Desempeño y Robustez de la Respuesta de un AVR con PID Optimizado
           Mediante el Algoritmo Seno Coseno (SCA)

    • Abstract: Resumen: Este trabajo presenta el análisis del comportamiento, desempeño y robustez del sistema de control de lazo cerrado de un Regulador Automático de Tensión (AVR) a través de un controlador PID del tipo dependiente (ANSI/ISA), donde las ganancias proporcional, integral y derivativa se sintonizan empleando dos métodos, el método de optimización meta heurística denominado Algoritmo Seno Coseno (Sine-Coseno Algorithm) y el método de última ganancia de Ziegler- Nichols. Son presentados los modelos del AVR y el controlador, son realizadas simulaciones empleando el software MatLab-Simulink®. Finalmente, son presentados resultados de simulación entre los dos métodos aquí descritos. : This work presents the analysis of the behavior, performance and robustness of the closed loop control system of an Automatic Voltage Regulator (AVR) through a dependent type PID controller (ANSI/ISA), where the proportional, integral and derivative gains are tuned using two methods, the metaheuristic optimization method called the Sine-Cosine Algorithm and the Ziegler- Nichols last-gain method. The models of the AVR and the controller are presented, simulations are carried out using the MatLab-Simulink® software. Finally, simulation results between the two methods presented are provided.
       
  • Modelamiento y simulación de un robot SCARA de tres grados de libertad
           empleando SolidWorks y Matlab/Simulink®

    • Abstract: Este trabajo presenta el modelado y simulación de un robot SCARA de 3 grados de libertad, establece los aspectos comparativos entre el método Euler-Lagrange y el uso de Solidworks para el seguimiento de trayectorias. Son presentados el modelo cinemático y dinámico del robot SCARA considerando la estructura modelada en SolidWorks, en este último se incluye la estructura mecánica, selección de material y su respectivo análisis estructural. Una vez finalizado el modelo CAD del robot SCARA, se procedió a la exportación del modelo al entorno de Matlab/Simulink® mediante el complemento de Simscape Multibody. Paralelamente, se presenta un modelo matricial basado en el método de Euler-Lagrange, adicionalmente el complemento de Simscape Multibody permitió realizar el dimensionado de los actuadores. Con los modelos basados en matrices y CAD son realizadas simulaciones y se establecen comparaciones entre ambos modelos considerando la trayectoria planeada. Se establecen ventajas y desventajas sobre el uso de ambos modelos.This paper presents the modeling and simulation of a SCARA robot with 3 degrees of freedom, establishes the comparative aspects between the Euler- Lagrange method and the use of Solidworks for trajectory tracking. The kinematic and dynamic model of the SCARA robot is presented considering the structure modeled in SolidWorks, in the latter the mechanical structure, material selection and its respective structural analysis are included. Once the CAD model of the SCARA robot was finished, the model was exported to the Matlab/Simulink® environment using the Simscape Multibody plugin. In parallel, a matrix model based on the Euler-Lagrange method is presented, additionally the Simscape Multibody plugin allowed the sizing of the necessary actuators for the robot. With the models based on matrixes and CAD, simulations are carried out and comparisons are established between both models considering the planned trajectory. Advantages and disadvantages of the use of both models are established.
       
  • Germinación in vitro de Epidendrum secundum con diferentes agentes
           gelificantes y concentraciones de agua de coco

    • Abstract: Resumen: Las orquídeas carecen de endospermo, es por ello que la germinación es baja, y además en condiciones naturales dependen de hongos micorrizicos para su sobrevivencia. Se tiene la alternativa de cultivarlas en condiciones in vitro para garantizar la germinación, debido a que le facilita condiciones químicas (medio de cultivo) y físicas para el establecimiento, para este fin los medios más empleados son Murashige y Skoog (MS), Vacin Wein (VW), Knudson C (KC), pero también, en otros trabajos emplearon medios basales de calidad baja (PA), como sales para la fertilización química de cultivos. En el presente estudio se realizó pruebas de germinación en Epidendrun secundum en medios alternativos con sales de cultivo hidropónico (macro y micronutrientes) suplementados con 10% y 20% de agua de coco (AC) y tipos de gelificantes (gelrite, agar y carragenina). Las semillas fueron desinfectadas con 0.5% de NaClO por 15 min. Fueron cultivados en la cámara de crecimiento a 25°C fotoperiodo de 16/8 horas luz y oscuridad, durante 105 días. Se evaluó el porcentaje de germinación, mortalidad y descripción de fases de desarrollo en la germinación. Epidendrum secundum presentó un 85,8% de geminación en el medio con gelrite con sales de macro y micronutrientes de hidroponía y con la adición de 20% de agua de coco. La germinación fue mejor (86,4%) con 20% de AC, que con 10% de AC que fue de (78,1%). No obstante, con la adición de carragenina, los protocormos germinados tienden a morirse en un 1,8%. : Orchids lack endosperm, which is why germination is low, and under natural conditions, they depend on mycorrhizal fungi for their survival. There is the alternative of cultivating them in vitro conditions to guarantee germination,because it facilitates chemical (culture medium) and physical conditions for the establishment, for this purpose the most used media are Murashige and Skoog (MS), Vacin Wein (VW), Knudson C (KC), but also, in other works, low-quality basal media (PA) were used, such as salts for chemical fertilization of crops. In the present study, germination tests were carried out on Epidendrun secundum in alternative media with hydroponic culture salts (macro and micronutrients) supplemented with 10% and 20% coconut water (AC) and types of gelling agents (gelrite, agar and carrageenan). The seeds disinfected with 0.5% NaClO for 15 min. They were cultivated in the growth chamber at 25°C with a photoperiod of 16/8 hours of light and darkness, for 105 days. The percentage of germination, mortality and description of development phases in germination evaluated. Epidendrum secundum presented 85.8% germination in the gelrite medium with macro and micronutrient salts from hydroponics and with the addition of 20% coconut water. Germination was better (86.4%) with 20% CA, than with 10% CA, which was (78.1%). However, with the addition of carrageenan, germinated protocorms tend to die by 1.8%.
       
 
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