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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 1 - 200 of 265 Journals sorted by number of followers
Science     Full-text available via subscription   (Followers: 4908)
Scientific American     Full-text available via subscription   (Followers: 493)
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 241)
Journal of the History of Ideas     Full-text available via subscription   (Followers: 163)
Scientific Reports     Open Access   (Followers: 82)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 49)
Science Advances     Free   (Followers: 42)
American Journal of Applied Sciences     Open Access   (Followers: 22)
Journal of Scientometric Research     Open Access   (Followers: 22)
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 19)
Studies in Science Education     Hybrid Journal   (Followers: 18)
Scienze Regionali : Italian Journal of Regional Science     Full-text available via subscription   (Followers: 18)
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
Bioethics Research Notes     Full-text available via subscription   (Followers: 15)
Ghana Studies     Full-text available via subscription   (Followers: 15)
Advanced Science     Open Access   (Followers: 15)
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 14)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 14)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 11)
Configurations     Full-text available via subscription   (Followers: 11)
Kennedy Institute of Ethics Journal     Full-text available via subscription   (Followers: 10)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 10)
Scientific American Mind     Full-text available via subscription   (Followers: 10)
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 9)
Data Curation Profiles Directory     Open Access   (Followers: 9)
Issues in Science & Technology     Free   (Followers: 8)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
Enhancing Learning in the Social Sciences     Open Access   (Followers: 7)
European Scientific Journal     Open Access   (Followers: 7)
Royal Society Open Science     Open Access   (Followers: 7)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 6)
Malawi Journal of Science and Technology     Open Access   (Followers: 6)
Scientific Data     Open Access   (Followers: 6)
Current Research in Geoscience     Open Access   (Followers: 5)
Journal of Analytical Science & Technology     Open Access   (Followers: 5)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
SINET : Ethiopian Journal of Science     Open Access   (Followers: 5)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 5)
Globe, The     Full-text available via subscription   (Followers: 4)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
International Journal of Innovation and Applied Studies     Open Access   (Followers: 4)
Network Science     Hybrid Journal   (Followers: 4)
Journal of Diversity Management     Open Access   (Followers: 4)
Tanzania Journal of Science     Open Access   (Followers: 4)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
The Social Studies     Hybrid Journal   (Followers: 3)
Theoria     Open Access   (Followers: 3)
National Academy Science Letters     Hybrid Journal   (Followers: 3)
Східно-Європейський журнал передових технологій : Eastern-European Journal of Enterprise Technologies     Open Access   (Followers: 3)
South East European University Review (SEEU Review)     Open Access   (Followers: 3)
Nordic Studies in Science Education     Open Access   (Followers: 3)
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
Science & Diplomacy     Free   (Followers: 3)
International Journal of Network Science     Hybrid Journal   (Followers: 3)
South African Journal of Science     Open Access   (Followers: 2)
Journal of Advanced Research     Open Access   (Followers: 2)
Asian Journal of Scientific Research     Open Access   (Followers: 2)
Proceedings of the Linnean Society of New South Wales     Full-text available via subscription   (Followers: 2)
Journal of Natural Sciences Research     Open Access   (Followers: 2)
Nuncius     Hybrid Journal   (Followers: 2)
Digithum     Open Access   (Followers: 2)
Science and Technology     Open Access   (Followers: 2)
Journal of Science and Technology     Open Access   (Followers: 2)
TECNOSCIENZA: Italian Journal of Science & Technology Studies     Open Access   (Followers: 2)
Springer Science Reviews     Hybrid Journal   (Followers: 2)
Journal of Social Science Research     Open Access   (Followers: 2)
Rehabilitation Research, Policy, and Education     Hybrid Journal   (Followers: 2)
New Directions in the Teaching of Physical Sciences     Open Access   (Followers: 2)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
Nordic Journal of Science and Technology     Open Access   (Followers: 2)
Australian Field Ornithology     Full-text available via subscription   (Followers: 1)
Politique et Sociétés     Full-text available via subscription   (Followers: 1)
COSMOS     Hybrid Journal   (Followers: 1)
Journal of Science and Technology Policy Management     Hybrid Journal   (Followers: 1)
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
Ingenieria y Ciencia     Open Access   (Followers: 1)
Investigacion y Ciencia     Open Access   (Followers: 1)
International Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 1)
Frontiers in Science     Open Access   (Followers: 1)
Modern Applied Science     Open Access   (Followers: 1)
OmniScience : A Multi-disciplinary Journal     Full-text available via subscription   (Followers: 1)
Scientific Journal of Pure and Applied Sciences     Open Access   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Technologies     Open Access   (Followers: 1)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
National Science Review     Hybrid Journal   (Followers: 1)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Science, Technology and Arts Research Journal     Open Access   (Followers: 1)
Journal of Scientific Research     Open Access   (Followers: 1)
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Epiphany     Open Access   (Followers: 1)
Fontanus     Open Access   (Followers: 1)
Образование и наука     Open Access   (Followers: 1)
THEORIA : An International Journal for Theory, History and Foundations of Science     Full-text available via subscription   (Followers: 1)
Heliyon     Open Access   (Followers: 1)
Revista Theoria     Open Access   (Followers: 1)
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 1)
Revista MundoFesc     Open Access  
Butlletí de la Institució Catalana d'Història Natural     Open Access  
Innovare : Revista de ciencia y tecnología     Open Access  
Revista Científica de la FAREM     Open Access  
Mutis     Open Access  
Ruhuna Journal of Science     Open Access  
Jurnal Teknosains     Open Access  
Revista Logos Ciencia & Tecnología     Open Access  
World Scientific Research     Open Access  
International Letters of Social and Humanistic Sciences     Open Access  
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Research Ideas and Outcomes     Open Access  
Apuntes de Ciencia & Sociedad     Open Access  
Jurnal Udayana Mengabdi     Open Access  
Conference Papers in Science     Open Access  
Jurnal MIPA     Open Access  
Unnes Science Education Journal     Open Access  
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access  
Selforganizology     Open Access  
Portal de la Ciencia     Open Access  
Mètode Science Studies Journal : Annual Review     Open Access  
Karbala International Journal of Modern Science     Open Access  
Revista Catarinense da Ciência Contábil     Open Access  
Reviews in Theoretical Science     Full-text available via subscription  
Temas y Debates     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Universitas (León)     Open Access  
Seminário de Iniciação Científica e Seminário Integrado de Ensino, Pesquisa e Extensão     Open Access  
ScienceRise     Open Access  
Zeitschrift für Didaktik der Naturwissenschaften     Hybrid Journal  
Simbiótica     Open Access  
Open Journal of Applied Sciences     Open Access  
Revista UNIMAR     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
Revista UniVap     Open Access  
Ithaca : Viaggio nella Scienza     Open Access  
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi     Open Access  
Communications in Applied Sciences     Open Access  
Ciencia Amazónica (Iquitos)     Open Access  
Smart Science     Open Access  
Science World Journal     Open Access  
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
International Journal of Engineering, Science and Technology     Open Access  
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Población y Desarrollo - Argonautas y caminantes     Open Access  
Journal of the South Carolina Academy of Science     Open Access  
MethodsX     Open Access  
Journal of Unsolved Questions     Open Access  
Journal of Science of the University of Kelaniya Sri Lanka     Open Access  
Metode & Forskningsdesign     Open Access  
International Archives of Science and Technology     Open Access  
Sciences du jeu     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Cuadernos de Investigación UNED     Open Access  
Interciencia     Open Access  
Ciencia Ergo Sum     Open Access  
Scientific World     Open Access  
Comunicata Scientiae     Open Access  
Uniciencia     Open Access  
SAINSTIS     Open Access  
Diálogos Interdisciplinares     Open Access  
Nepal Journal of Science and Technology     Open Access  
Revista Crítica de Ciências Sociais     Open Access  
Journal of Taibah University for Science     Open Access  
Journal of Integrated Science and Technology     Open Access  
Dhaka University Journal of Science     Open Access  
Karaelmas Science and Engineering Journal     Open Access  
Journal of the National Science Foundation of Sri Lanka     Open Access  
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Journal of the Asiatic Society of Bangladesh, Science     Open Access  
QScience Connect     Open Access  
Einstein (São Paulo)     Open Access  
Revista de la Universidad del Zulia     Open Access  
InterSciencePlace     Open Access  
Trilogía     Open Access  
Bangladesh Journal of Scientific Research     Open Access  
BIBECHANA     Open Access  
The Scientific World Journal     Open Access  
Walailak Journal of Science and Technology     Open Access  
Revista Sociedad y Economía     Open Access  
Revista Cientifica Guillermo de Ockham     Open Access  
Entramado     Open Access  
Universitas Scientiarum     Open Access  
Interface Focus     Full-text available via subscription  
Proceedings of the Royal Society of Queensland, The     Full-text available via subscription  
Chain Reaction     Full-text available via subscription  
UNED Research Journal / Cuadernos de Investigación UNED     Open Access  
Journal of King Saud University - Science     Open Access  
Anales del Instituto de la Patagonia     Open Access  
Transactions of Tianjin University     Full-text available via subscription  
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Tydskrif vir Geesteswetenskappe     Open Access  
TD : The Journal for Transdisciplinary Research in Southern Africa     Open Access  

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Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2091-0762 - ISSN (Online) 2091-0762
Published by Nepal Journals Online Homepage  [155 journals]
  • Study of aerosol optical properties in Lumbini, Nepal

    • Authors: Santosh Sapkota, Sabin Gautam, Santosh Pokhrel, Aayush Gautam, Kailash Basnet, Roshan Kumar Mishra, Jeevan Regmi
      Pages: 1 - 9
      Abstract: The mixture of different sized particles (fine and coarse) with air composition forms aerosols. Increased economic activities, vehicles, and rapid urbanization made Lumbini one of the heavily polluted regions in Nepal. Data are extracted from AERONET websites between 2013 to 2019 with standard deviation. We are mainly focused on understanding variations in aerosol optical properties: aerosol optical depth (AOD), angstrom parameter (α and β), visibility, single-scattering albedo (SSA), refractive index (real and imaginary), and asymmetry parameter (AP) in the Lumbini region. The maximum value of AOD (675nm) in Lumbini occurred mostly during post-monsoon season (0.61 ± 0.38) whereas, the values of AOD were found to be lower during the monsoon season (0.18 ± 0.12). Most of the AOD values  are found to be greater than 0.4, indicating the higher level of pollution in the study area. There is a positive correlation between perceptible water and AOD, maximum correlation (0.4) occurs at the lowest AOD (440nm) while the minimum (0.1) at the highest AOD (1020nm). The turbidity coefficient (β) has an adverse effect on visibility. The Visibility over Lumbini was found to be highest (20 km) during monsoon. Single-scattering albedo (SSA) accretions occur at wavelengths between 440 and 675 nm, but the pattern changes from 675 to 1020 nm. All parameters were found to be distinct and seasonal fluctuations among this station are mainly due to the different aerosols availability such as biomass burning, mixed aerosols, and anthropogenic aerosols over the Lumbini site.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.48825
      Issue No: Vol. 20, No. 1 (2023)
  • Porous activated carbon materials from Triphala seed stones for
           high-performance supercapacitor applications

    • Authors: Chhabi Lal Gnawali, Sabina Shahi, Sarita Manandhar, Ganesh Kumar Shrestha, Mandira Pradhannanga Adhikari, Rinita Rajbhandari, Bhadra P. Pokharel
      Pages: 10 - 20
      Abstract: Porous activated carbon materials derived from biomass could be the suitable materials for high-rate performance electrochemical supercapacitors as it exhibits high surface area due to well-defined pore structure. Here, we report the novel porous activated carbon from Triphala seed stones by chemical activation with zinc chloride at different carbonization temperature (400-700 °C) under the nitrogen gas atmosphere. The activated carbon was characterized by Fourier transform-infrared (FTIR) spectroscopy, Raman scattering and scanning electron microscopy (SEM). Nitrogen adsorption-desorption measurements was used to study the surface properties (effective surface areas, pore volumes and pore size distributions). The electrochemical measurements were performed in an aqueous 1 M sulphuric acid (H2SO4) solution in a three-electrode cell set up. Triphala seed stones-derived porous carbon materials with well-defined micro- and mesopores exhibit high specific surface area ranges from 878.7 to 1233.3 m2 g-1 and total pore volume ranges from 0.439 to 0.626 cm3 g-1. The specific capacitance obtained by electrochemical measurement experiment was 208.7 F g-1 at 1 A g-1. These results indicate that the prepared nanoporous activated carbon material from Triphala seed stones would have significant possibility as supercapacitor electrode material for high-energy-storage supercapacitor applications.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.53432
      Issue No: Vol. 20, No. 1 (2023)
  • Overall migration of microplastics in mineral water and non-alcoholic

    • Authors: Jagjit Kour, Pratima Bhatt, Shobha Basnet
      Pages: 21 - 26
      Abstract: In today's world, packaging plays a crucial role in enhancing, enclosing, and shielding the materials that are used from procurement to handling and storage, processing, manufacturing and finally to the consumer. Packaging shields a product's contents from contamination, spoiling and makes it simple to store and transfer anywhere. Man-made plastic breaks down into little particles as a result of numerous external pressures. The degradation of plastics produce nano or microplastic. Health issues arise when microplastics (MPs) leak from plastic food packaging and are consumed by people. Though plastic packaging is abundant, consumers from developing nation are not aware of the risk associated with plastic food packaging. The purpose of this study is to demonstrate occurrence of microplastics in plastic food packaging and highlight the risks involved in consumption of microplastics. In this research, the migration of microplastics from different plastic containers were noted in accordance to the Bureau of Indian Standards IS - 9845-1998. The IS 9845: 1998 method was utilized in this investigation to determine the overall migration of various plastics used to package mineral water and beverages. Distilled water and 3% acetic acid (w/v) were utilized as food simulators for the analysis. The migration of microplastics in mineral water were found to range from 0.38 ppm to 0.54 ppm while in case of non-alcoholic beverages overall migration ranged from 0.29 to 75.75 ppm. Among the 12 samples of non-alcoholic beverages, one sample exceeded the maximum limit of microplastics as specified by WHO standard.microplastics    
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.53457
      Issue No: Vol. 20, No. 1 (2023)
  • A systematic study on material properties of water retted Sterculia and
           Bauhinia fiber

    • Authors: Krishna Prasad Kandel, Girja Mani Aryal, Shishir Acharya KC, Mahesh Kumar Joshi, Bipeen Dahal, Bhanu Bhakta Neupane
      Pages: 27 - 35
      Abstract: Lignocellulose biomass forms an important component of traditional and next generation composite materials. To obtain desired properties, the biomass needs to be chemo‒mechanically processed at different levels. The raw lignocellulose fiber obtained from Sterculia villosa (Roxb.) and Bauhinia vahlii is traditionally believed to have high water stability; and therefore used in rural areas of South Asian regions to secure objects submerged under water. In this research, we systematically studied several material properties of raw Sterculia and Bauhinia fiber samples retted for 0, 20, 30 and 55 days (n=8). Water retting resulted in significant decrease in lignin and extractives content (p<0.05) and increase in cellulose content. Fiber bundle strength of Sterculia fiber increased with retting time (R2= 0.7) but Bauhinia fiber did not show significant change (p>0.05). Interestingly, water retting resulted in increased thermal stability in both fiber types. These findings suggested that the fiber studied have excellent water stability. The observed trend in mechanical and thermal properties could have resulted from crystallinity change and/or nominal fiber damage as supported by XRD and SEM imaging data; respectively. These findings suggested that Sterculia and Bauhinia fiber biomass could be an important component of biodegradable composite materials which are intended for high wetting and/or humid conditions.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.51793
      Issue No: Vol. 20, No. 1 (2023)
  • The fatalities and injuries due to avalanche effect in the Himalayan
           Region, Nepal

    • Authors: Pitri Bhakta Adhikari, Sapana Dawadi, Shanta Nepal
      Pages: 36 - 45
      Abstract: Snow avalanches present the major natural hazard in Himalayan region of Nepal.  The loss of human life is the main effect of avalanche. The records and casualties compared with specific Europe countries which help to analyze the hazard in the mountain region and can be recommend to the public people of this area about the avalanche condition, prevention from it and dissemination of information. On analyzing the statistics of avalanche fatality in the high mountain of Asia from 1895 to 2022, the fatality number was 59 at Annapurna and Dhaulagiri mountain Peaks. Different highest peaks of mountains attract tourist and the massive amount of snow create an avalanche in these areas, so Avalanche is one of the most devastating hazards in Western Himalayan. This fatality events, and fatality rates of Nepal and Europe countries from 1971 to 2022 analyzes the collected data from the DesInventar data-set, Disaster Risk Reduction Portal of the government of Nepal. The European Avalanche Warning System is used in the government of Europe using the geographic Information system (ArcGIS) tools. This study recommends the establishment of an Avalanche warning System with proper tools in the western Himalayan to save the life of humans and property.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.42206
      Issue No: Vol. 20, No. 1 (2023)
  • Fabrication of UV sensing transistor based on transparent polycrystalline
           zinc oxide thin film using polymeric electrolyte gate dielectric

    • Authors: Rishi Ram Ghimire, Yam Prasad Dahal, Krishna Bahadur Rai
      Pages: 46 - 54
      Abstract: The fabrication of electric double layer thin film transistors (EDLTFTs) using polymeric electrolyte as gate dielectric on chemically grown polycrystalline ZnO thin film channel has the lower threshold voltage at 0.4 V and the saturation current at 3 µA in the dark. The lower threshold voltage is -1 V and the saturation current is 10 µA in the UV illumination. In the dark and under UV light, the off state ID is 1 nA and 0.3 µA respectively and under gate and UV illumination the on current shows more than 3 times enhancement. This improvement in photocurrent is due to the combined effect of gate and UV illumination. The field effect mobility of the TFT is 0.06 cm2/Vs in the dark and 0.16 cm2/Vs under UV illumination. This increase in mobility under illumination and gate bias is due to the increase in carrier concentration and reduction of charged defects in the channel length.
      PubDate: 2023-04-10
      DOI: 10.3126/bibechana.v20i1.51788
      Issue No: Vol. 20, No. 1 (2023)
  • Analysis and characterization of X-ray flare of Mkn 421 using XMM-Newton
           observation 0658801301

    • Authors: Rajendra Neupane, Niraj Dhital
      Pages: 55 - 64
      Abstract: This research work was carried out to analyze the X-ray flares in Blazar Mkn 421 using data from XMM-Newton observation (Observation ID: 0658801301) that lasted for 8 hours. EPIC/pn data was used for statistical analysis of the light and spectrum curve in energy ranges from 0.3 to 10.0 keV. The best fit model for the spectrum was found to be the additive model (log-parabola + black-body). The measured integrated flux in the energy range of 0.3-2 keV is  5.015x10-10 ergs cm-2 s-1 with an associated uncertainty range of (5.010 – 5.020) x 10-10 ergs cm-2 s-1 at a 90% confidence level. Similarly, the measured integrated flux in the energy range of 2-10 keV is 2.398 x  10-10 ergs cm-2 s-1 with an associated uncertainty range of (2.392 – 2.405) x  10-10 ergs cm-2 s-1 at a 90% confidence level. The fractional variability of 0.444 is relatively high, which indicates that the source is variable. The fall in count per second per energy around 2 keV in the spectrum curve suggests that the intensity of X-rays decreases in a power law manner after a strong flare at this energy. The count-rate distribution of the observation analyzed is best described by a normal distribution which suggests that the emission mechanism in the blazar is governed by additive processes.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.53233
      Issue No: Vol. 20, No. 1 (2023)
  • A brief review on preparation and application of MWCNT-based polymer

    • Authors: Jyoti Giri, Rameshwar Adhikari
      Pages: 65 - 75
      Abstract: Technological advancementalways seeks new materials with improved functional properties, particularly for smart applications. In this regard, nanotechnology is offering today wide range of novel material designs fabricated by compounding nanofillers into the polymer matrix. Different allotropic forms of carbon can reinforce the properties of polymers for various applications. Reinforcement depends on the dimension, shape, size and compatibility of the nanofiller with the polymer matrix. Chemical modification of filler surfaces and the matrix can selectively localize the filler in the hybrid composites in the desired phase or at the interface by melt mixing or solution casting method, during compounding procedure. In this regard, the conducting nature of the additioin of multiwalled carbon nanotubes (MWCNTs) into a polymer matrix fosters the conductivity into the materials. Such nanocomposites can be used for numerous applications such as conducting materials, super-capacitors, light emitting devices, medical purposes etc,. This review paper focuses on different methods of preparation of MWCNT/polymer nanocomposites, their surface properties, and microbial properties etc,.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.53724
      Issue No: Vol. 20, No. 1 (2023)
  • Biosorption of Hexavalent Chromium (Cr(VI)) from contaminated water using
           charred tea waste

    • Authors: Puspa Lal Homagai, Miksha Bardewa, Anup Subedee, Hari Bhakta Oli, Ram Lal Shrestha, Deval Prasad Bhattarai
      Pages: 76 - 85
      Abstract: The goal of this study is to develop charred tea waste (CTW) via chemical process for the removal of Cr(VI) from contaminated water. Batch adsorption experiments were conducted as a function of pH, initial concentration, contact time and adsorbent dosage. Characterization of the adsorbent was analyzed by FT-IR and XRD. Maximum adsorption capacity (qm) of the CTW was found to be 85.32 mg/g at optimum pH 2 in 120 minutes. The adsorption on CTW was well fitted to the Langmuir isotherm and the kinetic data is consistent with the pseudo-second order kinetic model. The findings suggest that CTW could be an efficient and promising adsorbent for the removing Cr(VI) from aqueous solution.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.53458
      Issue No: Vol. 20, No. 1 (2023)
  • Mixing properties of liquid Al-Au alloys

    • Authors: Shashit Kumar Yadav, Upendra Mehta, Ram Prasad Koirala, Ramesh Kumar Gohivar
      Pages: 86 - 91
      Abstract: The thermodynamic and structural properties of liquid Al-Au alloy have been studied in frame-work of R-K polynomial using temperature-dependent energy interaction parameters at different temperatures. Thermodynamic properties, excess free energy of mixing and activity, and in structural properties, concentration fluctuation in long wave-length limit have been computed at temperatures 1338 K, 1500 K and 1600 K. The properties, such as surface tension and surface concentration of the system have been computed at above mentioned temperatures using Butler model. The system shows transformation from segregating to ordering in nature with increase in concentration of Au.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.53776
      Issue No: Vol. 20, No. 1 (2023)
  • Properties of dust in the North - East part of Perseus Cloud within the
           open cluster IC 348 using data from IRIS and AKARI

    • Authors: Surakshya Bhattarai, Madhu Sudan Paudel, Shiv Narayan Yadav, Ajay Kumar Jha
      Pages: 92 - 102
      Abstract: In this work, we have studied the dust properties of the North-East part of Perseus cloud having a size of 0.5o × 0.5o located at RA (ICRS): 56.14o DEC (ICRS): +32.15o, within the Open Cluster IC 348, using IRIS and AKARI data. An isolated region of size 0.39o×0.23o in IRIS and 0.34o×0.16o in AKARI data is detected within it. The infrared fluxes extracted using Aladin v11.0 are used to study the dust temperature and dust mass. The distance of the selected dust structure is calculated using Gaia EDR3, which is 309.98 pc. The infrared flux density is found to be increased for long-wavelength data. The average dust color temperature calculated from short-wavelength IRIS data is more than that calculated from long-wavelength AKARI data, which are 26.34 K±0.11 K for IRIS and 17.63 K±0.02 K for AKARI data. The mass of dust within the entire dust structure is 0.06 Mʘ for IRIS data and 37.44 Mʘ for AKARI data. Jeans mass for isolated region gives contradictory results in two surveys, for IRIS survey total mass is smaller than Jeans mass but for AKARI survey the total mass is larger than the Jeans mass. A good correlation between infrared fluxes is noticed for linear regression. The study background sources observed from the SIMBAD database explore the large number of stars, X-ray sources, YSOs, etc., embedded within the dust structure; some of them are responsible for dust heating and some for the contribution of dust mass. The contour map shows the identical distribution between infrared fluxes, dust color temperature and Planck’s function and dissimilar distribution between dust mass and visual extinction in IRIS and AKARI data. The high temperature at the central region suggests that the core of dust structure is thermally active, radiating the large thermal radiation in comparison to the outer region.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.49392
      Issue No: Vol. 20, No. 1 (2023)
  • Analysis of phytochemicals and biological activities of rhizome of Curcuma
           longa, aerial parts of Centella asiatica, and corn silk of Zea mays

    • Authors: Ayusha Hyaunmikha, Bimala Subba
      Pages: 103 - 112
      Abstract: Nepal is a storehouse of medicinal plants. Medicinal plants like the rhizome of Curcuma longa, the aerial part of Centella asiatica, and corn silk of Zea mays were used traditionally as medicine for diseases like inflammation, hepatic disorders, cough, etc. In this study, these selected plants were subjected to the analysis of phytochemical constituents, and biological activities following standard methods. Phytochemical analysis of the methanolic extract of these selected plants revealed the presence of different chemical constituents such as polyphenols, flavonoids, glycosides, quinones, saponins, and tannins. C. longa rhizomes also showed the strongest DPPH radical scavenging activity with IC50 of 55.06 µg/mL which was very close to standard ascorbic acid (49.09 µg/mL) than that of the aerial part of C. asiatica (72.56µg/mL) and corn silk of Z. mays (131.96 µg/mL). Total phenolic and total flavonoid content was found highest in C. longa with the values of 195.95 ± 0.899 mg GEA/g and 56.45 ±4.056 mg QE/g respectively. The phenolic and flavonoid content of methanolic extract of aerial parts of C. asiatica was found to be 110.78 ± 1.984 mg GEA/g and 30.00 ± 2.358 mg QE/g and corn silk of Z. mays were found to be 65.92 ± 1.244 mg GEA/g and 18.50 ±1.424 mg QE/g respectively. The methanolic extract of rhizomes of C. longa exhibited high α-amylase inhibitory activity with IC50 values of 382.30 µg/mL than that of C. asiatica with IC50 value of 520.48 µg/mL and Z. mays with IC50 value 593.09 µg/mL.
      PubDate: 2023-04-05
      DOI: 10.3126/bibechana.v20i1.52006
      Issue No: Vol. 20, No. 1 (2023)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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