Bulletin of Natural Sciences Research最新文献

{"title":"NOMA COOPERATIVE RELAYING SYSTEMS OVER RICIAN-SHADOWED FADING CHANNELS","authors":"S. Panic, Sergei Khotnenok","doi":"10.5937/bnsr12-40124","DOIUrl":"https://doi.org/10.5937/bnsr12-40124","url":null,"abstract":"Non-orthogonal multiple Access (NOMA) is an efficient 5G technology that enables network spectral efficiency increase and network access latency. In order to additionally improve the reliability of transmission and increase the achievable rate of NOMA system, combined utilization of NOMA and cooperative relay transmission (CRS) could appear as effective remedy. In this work, we will carry out performance analysis of NOMA based CRS over Rician-Shadowed fading channels. The closed-form expression for the exact average achievable rate is presented in the form of Meijer G functions infinite-series. Numerical results are presented in order to manifest the credibility of the presented method.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121915785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EXTRACT OF Morinda lucida LEAF RESCUES HYPOGLYCAEMIC AND DYSLIPIDAEMIC CONDITIONS IN Plasmodium berghei-INFECTED MICE","authors":"A. Abdulkareem, A. Babamale, A. T. Anifowoshe, O. A. Opeyemi, Nusirat Oloriegbe, Comfort Adamolekun, Samson Adetula, A. Ala","doi":"10.5937/bnsr12-35454","DOIUrl":"https://doi.org/10.5937/bnsr12-35454","url":null,"abstract":"Increasing drug resistance is a great threat to malaria control. Therefore, a continuous investigation into alternative therapy to mitigate malaria-associated damages is important. In this study, we investigated the anti-hypoglycaemic and anti-hyperlipidaemic effects of aqueous extract of Morinda lucida leaf in Plasmodium berghei­-infected mice. Twenty-five mice were randomly grouped into five: Uninfected, infected-untreated, chloroquine (20 mg/kg, per oral), and extract-treated (400 mg/kg and 800 mg/kg, respectively, per oral) groups. Fasting blood glucose was measured before parasite inoculation and after the last treatment. Blood was collected for lipid profile assay at the end of the 4-day treatment. Our results revealed that both chloroquine and the extract lowered parasite growth (p <0.05), while chloroquine and 400 mg/kg of the extract improved blood glucose in Plasmodium berghei-infection. More so, all the treated groups showed attenuated Plasmodium berghei-induced dyslipidaemia, with 400 mg/kg of the extract exhibiting better efficacy. Therefore, this study suggests that Morinda lucida leaf extract can be harnessed as a therapeutic regimen for improved malaria treatments and associated complications. Further study is recommended to elucidate the mechanism of anti-hypoglycaemic and anti-hyperlipidaemic activities of the extract and the possible bioactive compound(s) involved.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127798592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SPECTRAL CHARACTERISTICS OF TWO PARAMETER FIFTH DEGREE POLYNOMIAL CONVOLUTION KERNEL","authors":"Z. Milivojevic, Natasa Savic, B. Prlincevic","doi":"10.5937/bnsr12-38771","DOIUrl":"https://doi.org/10.5937/bnsr12-38771","url":null,"abstract":"In this paper, the spectral characteristic of a polynomial two parameter convolutional fifth - order interpolation kernel is determined. The spectral characteristic is determined as follows. First, the kernel is decomposed into components. After that, the spectral characteristics of each kernel component were calculated using the Fourier transform. Finally, the spectral characteristic of the interpolation two parameter kernel using a combination of the spectral components of the kernels and the kernel parameters, α and β, is formed. Through a numerical example and a graphical representation of the spectral characteristics of the one parameter and two parameter kernels, greater similarity of the spectral characteristics of the 2 P kernel, relative to the ideal box characteristic, is shown.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127248638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALYSIS OF STATIC BEHAVIOR OF ION SENSITIVE FIELD EFFECT TRANSISTOR FOR PH MEASUREMENTS","authors":"T. Kevkić, R. Maity, D. Todorovic, B. Vučković, N. Maity","doi":"10.5937/bnsr12-37850","DOIUrl":"https://doi.org/10.5937/bnsr12-37850","url":null,"abstract":"The Ion-Sensitive Field-Effect Transistor (ISFET) is one of the most popular pH sensors traditionally using to measure hydrogen ion concentration (pH) of the electrolytic solutions. It is developed from Metal Oxide Semiconductor Field-Effect Transistor (MOSFET) by replacing gate electrode with an electrolytic solution to be tested, and a reference metal electrode immersed in that solution. Basic principle of ISFET operation is based on that of standard NMOS structure in conjunction with the insulator-electrolyte capacitor as described in this paper. The site-binding theory (generalized to two kinds of binding sites), together with the Gouy - Chapman- Stern model for the potential profile in the electrolyte, is coupled to the MOS physics. As a result, an approximate analytical model which completely describes static behavior of the ISFET is obtained. The developed description can serve as useful tool for understanding many contemporary biosensors based on original ISFET structure which has broad application in biomedicine, biological, chemistry and environmental areas.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128048760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GENERALIZED α-MIN SPECIAL TYPE CONTRACTION RESULTS ON 2-MENGER SPACES","authors":"S. K. Bhandari, S. Chandok","doi":"10.5937/bnsr12-34903","DOIUrl":"https://doi.org/10.5937/bnsr12-34903","url":null,"abstract":"The goal of this paper is to present some novel probabilistic α-minimum contraction results on probabilistic 2-metric spaces. Our findings are based on probabilistic 2-metric spaces, which are the probabilistic generalisations of 2-metric spaces. An illustrative example backs up our findings.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"236 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132091410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EXISTENCE OF INVARIANT POINTS AND APPLICATIONS TO SIMULTANEOUS APPROXIMATION","authors":"S. Chandok, T. D. Narang","doi":"10.5937/bnsr12-33064","DOIUrl":"https://doi.org/10.5937/bnsr12-33064","url":null,"abstract":"For the set of ε-simultaneous approximation and ε-simultaneous coapproximation, we derive certain BrosowskiMeinardus type invariant point results in this paper. As a consequence, some results on ε-approximation, εcoapproximation, best approximation, and best coapproximation are also deduced.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"446 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122938112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IDENTIFICATION AND DETERMINATION OF 2,5-DIMETOXY-4-BROMOPHENETHYLAMINE (2C-B) IN REAL SAMPLE BY GC-MS METHODS AND DERIVATIZATION AFTER SPE PREPARATION","authors":"V. Lukić, R. Micić, Živana Radosavljević","doi":"10.5937/bnsr12-28145","DOIUrl":"https://doi.org/10.5937/bnsr12-28145","url":null,"abstract":"The abuse of new psychoactive substances is attracting a lot of attention from the world public. There is an increasing use among young people, who are not aware of the harmful effects of this substances. Some of these substances may have been around for years, but have reemerged in the market in altered chemical forms and launched as legal alternatives to common drugs of abuse. This paper describes application of gas chromatography coupled with mass spectrometry method (GC-MS) to identify 2,5-dimetoxy-4-bromophenethylamine (2C-B) compound in urine sample after solid phase extraxtion and derivatization with N-methyl-bis-trifluoroacetamide (MBTFA). Gas chromatographic separation of TFA derivative of 2C-B (2C-B TFA) was successfully performed using DB-5MS capillary column (5% diphenyl-95% dimethilsiloxane). Selected ion monitoring (SIM) technique was used for qvantitative analyses wich was performed using matrix mached calibratores, whereby good results were achieved. Urine sample wich contained 2C-B was obtained within International Quality Assurance Programme - International Collaborative Exercises (ICE) program organized by the scientific department of United Nations Office on Drugs and Crime (UNODC). The aim of this study was to develop a simple and sensitive method of gas chromatography mass spectrometry (GC-EI-MS) for the identification, extraction and quantitative analysis of 2C-B in the urine sample, which is near the blood remains a priority analyzed matrix in clinical and forensic toxicology.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134154843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ISO Cluster classifier by ArcGIS for unsupervised classification of the Landsat TM image of Reykjavík","authors":"Polina Lemenkova","doi":"10.5937/bnsr11-30488","DOIUrl":"https://doi.org/10.5937/bnsr11-30488","url":null,"abstract":"The paper presents the use of the Landsat TM image processed by the ArcGIS Spatial Analyst Tool for environmental mapping of southwestern Iceland, region of Reykjavik. Iceland is one of the most special Arctic regions with unique flora and landscapes. Its environment is presented by vulnerable ecosystems of highlands where vegetation is affected by climate, human or geologic factors: overgrazing, volcanism, annual temperature change. Therefore, mapping land cover types in Iceland contribute to the nature conservation, sustainable development and environmental monitoring purposes. This paper starts by review of the current trends in remote sensing, the importance of Landsat TM imagery for environmental mapping in general and Iceland in particular, and the requirements of GIS specifically for satellite image analysis. This is followed by the extended methodological workflow supported by illustrative print screens and technical description of data processing in ArcGIS. The data used in this research include Landsat TM image which was captured using GloVis and processed in ArcGIS. The methodology includes a workflow involving several technical steps of raster data processing in ArcGIS: 1) coordinate projecting, 2) panchromatic sharpening, 3) inspection of raster statistics, 4) spectral bands combination, 5) calculations, 6) unsupervised classification, 7) mapping. The classification was done by clustering technique using ISO Cluster algorithm and Maximum Likelihood Classification. This paper finally presents the results of the ISO Cluster application for Landsat TM image processing and concludes final remarks on the perspectives of environmental mapping based on Landsat TM image processing in ArcGIS.The results of the classification present landscapes divided into eight distinct land cover classes: 1) bare soils; 2) shrubs and smaller trees in the river valleys, urban areas including green spaces; 3) water areas; 4) forests including the Reykjanesfólkvangur National reserve; 5) ice-covered areas, glaciers and cloudy regions; 6) ravine valleys with a sparse type of the vegetation: rowan, alder, heathland, wetland; 7) rocks; 8) mixed areas. The final remarks include the discussion on the development of machine learning methods and opportunities of their technical applications in GIS-based analysis and Earth Observation data processing in ArcGIS, including image analysis and classification, mapping and visualization, machine learning and environmental applications for decision making in forestry and sustainable development.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125135295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New data on the distribution of Lepidoptera in Montenegro, with a review of aberrant forms","authors":"P. Jakšić, Andrew H King","doi":"10.5937/bnsr11-29876","DOIUrl":"https://doi.org/10.5937/bnsr11-29876","url":null,"abstract":"During the three-year period of investigations, species from the families Depressariidae Meyrick, 1883, Pyralidae Latreille, 1809, Crambidae Latreille, 1810, Lycaenidae Leach, 1815, Nymphalidae Rafinesque, 1815, Geometridae Leach, 1815 and Erebidae Leach, 1815 were investigated. Investigations were carried out in 20 localities, distributed throughout the entire territory of Montenegro. Two species are listed for Montenegro for the first time: Hypoxystis pluviaria (Fabricius, 1787) and Aspitates ochrearia (Rossi, 1794).","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125227793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geospatial assessment of vegetation condition pre-wildfire and post-wildfire on Luštica (Montenegro) using differenced Normalized Burn Ratio (dNBR) index","authors":"Filip Vujovic, G. Nikolić","doi":"10.5937/bnsr12-39990","DOIUrl":"https://doi.org/10.5937/bnsr12-39990","url":null,"abstract":"Wildfire is one of the most dangerous environmental stressors in most vegetation zones worldwide. Determining and monitoring this stressor is important because of the disturbances that occur during the burning of biomass in ecosystems, as well as because of the damage or suffering of organisms. In the last decade, a greater number of wildfires and burnt areas were recorded in Southern Europe and Montenegro. Therefore, it is important to develop optimal methodology and models to help in better management of forest protection against wildfire. The spatial component in firefighting plays a significant role in management. In this context, Remote Sensing and Geographic Information Systems (GIS) come to the fore, which analyze spatial data and turn it into useful information - models applied in practice. The study aims to geospatial assess condition of vegetation pre-wildfire and post-wildfire in study area of the Luštica peninsula in Montenegro during the summer of 2017. Open and publicly available Sentinel 2 satellite was used. The scaled index differenced Normalized Burn Ratio (dNBR) of burned vegetation was applied as an indicator for assessing the state of vegetation after a wildfire in the open source software Quantum GIS (QGIS). The results of the damage assessment of the burned area based on the applied scaled index reveal that the category of low severity occupies an area of 335.86 ha (7%), moderately-low severity 250.13 ha (5%), moderately-high severity 406.22 ha (8%), high severity 238.03 ha (5%). The unburned areas occupy an area of 3624.95 ha (75%). This study contributes to assessing vegetation conditions and other accompanying activities pre-wildfire and post-wildfire using modern open-source geospatial tools.","PeriodicalId":109324,"journal":{"name":"Bulletin of Natural Sciences Research","volume":"282 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116085195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}