首页 > 最新文献

The University Thought - Publication in Natural Sciences最新文献

英文 中文
SYNTHESIS AND COMPLETE NMR SPECTRAL ASSIGNMENTS OF NEW BENZYLAMINO COUMARIN DERIVATIVE 新的苯氨基香豆素衍生物的合成及完整的核磁共振谱配位
Pub Date : 2020-06-17 DOI: 10.5937/univtho10-26133
V. Dekić, N. Radulović, Milenko N. Ristić, B. Dekić, Novica R. Ristić
This research involves the reaction of 4-chloro-3-nitrocoumarin and (4-methoxyphenyl)methanamine, whereby a novel coumarin derivative 4-[(4-methoxybenzyl) amino]-3-nitro-2H-chromen-2-one was obtained in good yield. The reaction was carried out in ethyl acetate, in the presence of triethylamine. Also, a detailed spectral analysis of a new coumarin derivative is presented. Resonance assignment was achieved using one- (1H NMR and 13C NMR) and two-dimensional NMR techniques (1H-1H-COSY, NOESY, HSQC, and HMBC). The NOESY correlations of protons from arylamino substituent and coumarin core indicate their spatial orientation.
本研究以4-氯-3-硝基香豆素和(4-甲氧基苯基)甲胺为原料,合成了新的香豆素衍生物4-[(4-甲氧基苯基)氨基]-3-硝基- 2h -2- 1。该反应在乙酸乙酯中,在三乙胺的存在下进行。同时,对一种新的香豆素衍生物进行了详细的光谱分析。利用一核磁共振(1H NMR和13C NMR)和二维核磁共振技术(1H-1H- cosy, NOESY, HSQC和HMBC)实现了共振分配。芳基取代基质子与香豆素核质子的noasy相关性表明它们的空间取向。
{"title":"SYNTHESIS AND COMPLETE NMR SPECTRAL ASSIGNMENTS OF NEW BENZYLAMINO COUMARIN DERIVATIVE","authors":"V. Dekić, N. Radulović, Milenko N. Ristić, B. Dekić, Novica R. Ristić","doi":"10.5937/univtho10-26133","DOIUrl":"https://doi.org/10.5937/univtho10-26133","url":null,"abstract":"This research involves the reaction of 4-chloro-3-nitrocoumarin and (4-methoxyphenyl)methanamine, whereby a novel coumarin derivative 4-[(4-methoxybenzyl) amino]-3-nitro-2H-chromen-2-one was obtained in good yield. The reaction was carried out in ethyl acetate, in the presence of triethylamine. Also, a detailed spectral analysis of a new coumarin derivative is presented. Resonance assignment was achieved using one- (1H NMR and 13C NMR) and two-dimensional NMR techniques (1H-1H-COSY, NOESY, HSQC, and HMBC). The NOESY correlations of protons from arylamino substituent and coumarin core indicate their spatial orientation.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75649292","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}
引用次数: 0
Analysis of geodesics on different surfaces 分析不同表面上的测地线
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-20589
M. Maksimović, T. Jovanović, E. Ljajko, Milica Ivanović
It is widely known that some surfaces contain special curves as a geodesics, while a lots of geodesics on surface have complicated shapes. Goal of this research is to find on what surfaces are uand vparameter curves geodesics. Developable surfaces that contain a given plane curve as a geodesic are studied in the article, whereas the plane curve is also an initial u-parameter curve on that surface. Parametric equations of the minimal surfaces that contain an epicycloid as a geodesic are also given. Visualization of geodesics was done in Mathematica.
众所周知,一些曲面包含特殊的曲线作为测地线,而许多曲面上的测地线具有复杂的形状。本研究的目的是找出在什么表面上是无参数曲线的测地线。本文研究了包含给定平面曲线作为测地线的可展曲面,而平面曲线也是该曲面上的初始u参数曲线。给出了以表摆线为测地线的最小曲面的参数方程。测地线的可视化是在Mathematica中完成的。
{"title":"Analysis of geodesics on different surfaces","authors":"M. Maksimović, T. Jovanović, E. Ljajko, Milica Ivanović","doi":"10.5937/univtho10-20589","DOIUrl":"https://doi.org/10.5937/univtho10-20589","url":null,"abstract":"It is widely known that some surfaces contain special curves as a geodesics, while a lots of geodesics on surface have complicated shapes. Goal of this research is to find on what surfaces are uand vparameter curves geodesics. Developable surfaces that contain a given plane curve as a geodesic are studied in the article, whereas the plane curve is also an initial u-parameter curve on that surface. Parametric equations of the minimal surfaces that contain an epicycloid as a geodesic are also given. Visualization of geodesics was done in Mathematica.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89128390","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}
引用次数: 0
Analysis of air temperature trends: City of Podgorica (Montenegro) 波德戈里察市(黑山)气温趋势分析
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-24790
Nikola R. Bačević, A. Valjarević, Dušan Kićović, Nikola Milentijević, M. Ivanović, Meliha Mujević
This paper presents the results of the analyzed trends for three categories of parameters: average annual air temperature (YT), average maximum air temperature (YTx) and average minimum air temperature (YTn) for the Podgorica Meteorological Station in the Republic of Montenegro. The aim of this paper is to present possible climate changes based on the results obtained from the analyzed air temperature trends. The methodology is based on the application of: a) linear trend equations, b) trend magnitudes and c) Mann-Kendall trend test. The data from the respectable meteorological station in Podgorica for the period from 1947 to 2018 were used in order to estimate the trend. The obtained results indicate a statistically significant positive trend for all analyzed time series. Analyzing the trend test hypotheses, it was concluded that in all three cases the Ha hypothesis prevails. Average annual air temperature in Podgorica increased by 1.4°C, average maximum air temperature increased by 2.5°C and average minimum air temperature increased by 0.6°C. In accordance with the trends analyzed, the increase in air temperature is dominant in the capital of the Republic of Montenegro.
本文介绍了黑山共和国波德戈里察气象站的年平均气温(YT)、平均最高气温(YTx)和平均最低气温(YTn) 3类参数的趋势分析结果。本文的目的是根据分析的气温趋势得出的结果,提出可能的气候变化。该方法基于:a)线性趋势方程,b)趋势幅度和c) Mann-Kendall趋势检验的应用。波德戈里察著名气象站1947年至2018年的数据被用来估计这一趋势。所得结果表明,所有分析的时间序列都有统计学上显著的正趋势。分析趋势检验假设,得出的结论是,在所有三种情况下,Ha假设占上风。波德戈里察年平均气温上升1.4°C,平均最高气温上升2.5°C,平均最低气温上升0.6°C。根据分析的趋势,气温的上升在黑山共和国首都占主导地位。
{"title":"Analysis of air temperature trends: City of Podgorica (Montenegro)","authors":"Nikola R. Bačević, A. Valjarević, Dušan Kićović, Nikola Milentijević, M. Ivanović, Meliha Mujević","doi":"10.5937/univtho10-24790","DOIUrl":"https://doi.org/10.5937/univtho10-24790","url":null,"abstract":"This paper presents the results of the analyzed trends for three categories of parameters: average annual air temperature (YT), average maximum air temperature (YTx) and average minimum air temperature (YTn) for the Podgorica Meteorological Station in the Republic of Montenegro. The aim of this paper is to present possible climate changes based on the results obtained from the analyzed air temperature trends. The methodology is based on the application of: a) linear trend equations, b) trend magnitudes and c) Mann-Kendall trend test. The data from the respectable meteorological station in Podgorica for the period from 1947 to 2018 were used in order to estimate the trend. The obtained results indicate a statistically significant positive trend for all analyzed time series. Analyzing the trend test hypotheses, it was concluded that in all three cases the Ha hypothesis prevails. Average annual air temperature in Podgorica increased by 1.4°C, average maximum air temperature increased by 2.5°C and average minimum air temperature increased by 0.6°C. In accordance with the trends analyzed, the increase in air temperature is dominant in the capital of the Republic of Montenegro.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"51 1","pages":"31-36"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71151570","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}
引用次数: 2
Application of Mann-Kendal (MK) test in trend analysis of air temperature and precipitation: Case of Mačva district (Serbia) Mann-Kendal (MK)检验在气温和降水趋势分析中的应用——以塞尔维亚ma<e:1>瓦地区为例
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-24774
Nikola Milentijević, Nikola R. Bačević, Dušan Ristić, A. Valjarević, M. Pantelic, Dušan Kićović
Recent climate changes cause significant natural and socio-economic consequences. They represent one of the major environmental problems of the late 20 and early 21 centuries. Changes in temperature and precipitation play a significant role in understanding climate change issues. They include numerous extreme climatic events such as heat waves, droughts, forest fires and more. Looking at regional differences in temperature and precipitation regime change, Southern Europe, including the Republic of Serbia, occupies a special place. The Mačva district (3.272 km2) is almost four times as spacious as the Mačva area. The administrative -political division of the Mačva district is comprised of eight municipalities. The paper presents trends of two climate variables: mean annual air temperature and mean annual precipitation in the study area. In methodological sense, the main statistical procedure is the non-parametric Mann-Kendall (MK) test. Data from three available meteorological stations in the Mačva district (1949-2015) were used for the analysis. The presented results of the trends in air temperature indicate that there is a statistically significant positive trend in all-time series. In trends, precipitation amounts a statistically significant positive trend was observed in two time series, while in one there is no trend. The expressed trends, especially in the case of air temperatures, lead to the possibility of drought. Mačva district and Mačva have some agricultural importance in the Republic of Serbia. For these reasons, some adaptation to climate change is needed as arid conditions lead to fluctuations in agricultural yield.
最近的气候变化造成了重大的自然和社会经济后果。它们代表了20世纪末和21世纪初的主要环境问题之一。温度和降水的变化对理解气候变化问题起着重要作用。它们包括许多极端气候事件,如热浪、干旱、森林火灾等等。从温度和降水制度变化的区域差异来看,南欧,包括塞尔维亚共和国,占据了一个特殊的位置。ma va区(3.272平方公里)几乎是ma va区面积的四倍。马瓦区行政政治区划由八个市组成。本文给出了研究区年平均气温和年平均降水量两个气候变量的变化趋势。在方法学意义上,主要的统计程序是非参数Mann-Kendall (MK)检验。使用了ma va地区三个可用气象站(1949-2015)的数据进行分析。气温变化趋势的结果表明,在历史序列中有统计学上显著的正趋势。在趋势上,两个时间序列的降水量呈统计学上显著的正趋势,而一个时间序列则没有趋势。所表达的趋势,特别是在空气温度的情况下,导致干旱的可能性。马瓦区和马瓦在塞尔维亚共和国具有一定的农业重要性。由于这些原因,由于干旱条件导致农业产量波动,需要对气候变化进行一些适应。
{"title":"Application of Mann-Kendal (MK) test in trend analysis of air temperature and precipitation: Case of Mačva district (Serbia)","authors":"Nikola Milentijević, Nikola R. Bačević, Dušan Ristić, A. Valjarević, M. Pantelic, Dušan Kićović","doi":"10.5937/univtho10-24774","DOIUrl":"https://doi.org/10.5937/univtho10-24774","url":null,"abstract":"Recent climate changes cause significant natural and socio-economic consequences. They represent one of the major environmental problems of the late 20 and early 21 centuries. Changes in temperature and precipitation play a significant role in understanding climate change issues. They include numerous extreme climatic events such as heat waves, droughts, forest fires and more. Looking at regional differences in temperature and precipitation regime change, Southern Europe, including the Republic of Serbia, occupies a special place. The Mačva district (3.272 km2) is almost four times as spacious as the Mačva area. The administrative -political division of the Mačva district is comprised of eight municipalities. The paper presents trends of two climate variables: mean annual air temperature and mean annual precipitation in the study area. In methodological sense, the main statistical procedure is the non-parametric Mann-Kendall (MK) test. Data from three available meteorological stations in the Mačva district (1949-2015) were used for the analysis. The presented results of the trends in air temperature indicate that there is a statistically significant positive trend in all-time series. In trends, precipitation amounts a statistically significant positive trend was observed in two time series, while in one there is no trend. The expressed trends, especially in the case of air temperatures, lead to the possibility of drought. Mačva district and Mačva have some agricultural importance in the Republic of Serbia. For these reasons, some adaptation to climate change is needed as arid conditions lead to fluctuations in agricultural yield.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"10 1","pages":"37-43"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71151970","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}
引用次数: 4
Rural spring geometer moths (Lepidoptera, Geometroidea leach, 1815) in Kosovo and Metohia (Serbia) 科索沃和梅托希亚(塞尔维亚)农村春季几何蛾(鳞翅目,几何idea leach, 1815)
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-24338
V Nebojša Živić, N. P. Jakšić
This paper shows the presence of the rural geometer moths in 15 localities of Kosovo and Metohia (Serbia). A review of existing data regarding the area of Kosovo and Metohia is given. Through research, the presence of 48 species was revealed. Between them, five species are reported as new for the fauna of Kosovo and Metohia: Plagodis pulveraria (Linnaeus, 1758), Scotopteryx luridata (Hufnagel, 1767), Catarhoe cuculata (Hufnagel, 1767), Anticlea badiata (Denis & Schiffermüller, 1775) and Anticlea derivata (Denis & Schiffermüller, 1775).
本文显示了在科索沃和梅托希亚(塞尔维亚)的15个地方农村几何蛾的存在。对有关科索沃和梅托希亚地区的现有数据进行了审查。通过研究,发现了48种。其中,科索沃和梅托希亚有5个新种:Plagodis粉虫(Linnaeus, 1758)、Scotopteryx luridata (Hufnagel, 1767)、Catarhoe cuculata (Hufnagel, 1767)、antilea badiata (Denis & schifferm ller, 1775)和antilea衍生(Denis & schifferm ller, 1775)。
{"title":"Rural spring geometer moths (Lepidoptera, Geometroidea leach, 1815) in Kosovo and Metohia (Serbia)","authors":"V Nebojša Živić, N. P. Jakšić","doi":"10.5937/univtho10-24338","DOIUrl":"https://doi.org/10.5937/univtho10-24338","url":null,"abstract":"This paper shows the presence of the rural geometer moths in 15 localities of Kosovo and Metohia (Serbia). A review of existing data regarding the area of Kosovo and Metohia is given. Through research, the presence of 48 species was revealed. Between them, five species are reported as new for the fauna of Kosovo and Metohia: Plagodis pulveraria (Linnaeus, 1758), Scotopteryx luridata (Hufnagel, 1767), Catarhoe cuculata (Hufnagel, 1767), Anticlea badiata (Denis & Schiffermüller, 1775) and Anticlea derivata (Denis & Schiffermüller, 1775).","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74672982","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}
引用次数: 2
Some remarks on an alternative approach for Boltzmann distribution of hydrogen atoms 关于氢原子玻尔兹曼分布的另一种方法的一些评论
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-26075
N. Fabiano, S. Radenović
We propose an alternative approach to Boltzmann distribution concerning the hydrogen atom and compare our results to previous formalism for some observables.
我们提出了一种关于氢原子的玻尔兹曼分布的替代方法,并将我们的结果与以前的一些可观测值的形式进行了比较。
{"title":"Some remarks on an alternative approach for Boltzmann distribution of hydrogen atoms","authors":"N. Fabiano, S. Radenović","doi":"10.5937/univtho10-26075","DOIUrl":"https://doi.org/10.5937/univtho10-26075","url":null,"abstract":"We propose an alternative approach to Boltzmann distribution concerning the hydrogen atom and compare our results to previous formalism for some observables.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72580152","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}
引用次数: 0
Phenolic and flavonoid content and antioxidant evaluation of hawthorn (Crataegus monogyna Jacq.) fruits and leaves extracts 山楂果实和叶提取物的酚类和类黄酮含量及抗氧化性评价
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-25574
V. Dekić, Novica R. Ristić, B. Dekić, Milenko N. Ristić
Considering the facts that phenolic compounds have many pharmacological effects, as well that antioxidant effect of phenolic compounds has been proven in various experimental systems, aim of this research was to determine the content of total phenols and flavonoids and evaluation of antioxidant activity in ethanol, ethyl acetate and chloroform extracts of fruits and leaves of the plant species Crataegus monogya Jacq., which is known as common hawthorn. The content of total phenolic compounds was determined by the spectrophotometric method using Folin-Ciocalteu reagent and the content of flavonoids was determined using aluminum chloride. In vitro evaluation of the antioxidant activity of tested extracts was performed using the DPPH method. The amount of total phenolics was varied in fruits and leaves extracts and ranged from 38.05 ± 0.18 to 365.11 ± 0.32 mg GAE/g dw. Ethyl acetate extract of hawthorn leaves showed the highest content of phenolic compounds (365.11 ± 0.32 mg GAE/g dw). The flavonoid content was different in the fruits and leaves of hawthorn and ranged from 21.11 ± 0.11 to 122.98 ± 0.21 mg RU/g dw, whereby the highest content of flavonoids was found in ethyl acetate extract of leaves (122.98 ± 0.21 mg RU/g dw). Antioxidant activity of the tested extracts was expressed as IC50 values and ranged from 5.53 ± 0.08 to 293.51 ± 0.28 μg/ml. Ethyl acetate extract of hawthorn leaves showed considerable antioxidant potential (IC50 = 5.53 ± 0.08 μg/ml). Based on the obtained results, a significant correlation was found between the antioxidant activity and the content of total phenolics and flavonoids compounds in hawthorn fruits and leaves extracts.
考虑到酚类化合物具有多种药理作用,且酚类化合物的抗氧化作用已在各种实验体系中得到证实,本研究的目的是测定山楂果实和叶片中乙醇、乙酸乙酯和氯仿提取物中总酚和总黄酮的含量,并评价其抗氧化活性。,俗称普通山楂。用Folin-Ciocalteu试剂分光光度法测定总酚类化合物的含量,用氯化铝法测定总黄酮的含量。采用DPPH法体外评价所测提取物的抗氧化活性。果实和叶片提取物中总酚含量在38.05±0.18 ~ 365.11±0.32 mg GAE/g dw之间。山楂叶乙酸乙酯提取物中酚类化合物含量最高(365.11±0.32 mg GAE/g dw)。山楂果实和叶片中黄酮类化合物含量差异较大,为21.11±0.11 ~ 122.98±0.21 mg RU/g dw,其中叶中乙酸乙酯提取物含量最高,为122.98±0.21 mg RU/g dw。抗氧化活性以IC50值表示,范围为5.53±0.08 ~ 293.51±0.28 μg/ml。山楂叶乙酸乙酯提取物具有较强的抗氧化活性(IC50 = 5.53±0.08 μg/ml)。结果表明,山楂果实和叶提取物的抗氧化活性与总酚类化合物和总黄酮含量呈显著相关。
{"title":"Phenolic and flavonoid content and antioxidant evaluation of hawthorn (Crataegus monogyna Jacq.) fruits and leaves extracts","authors":"V. Dekić, Novica R. Ristić, B. Dekić, Milenko N. Ristić","doi":"10.5937/univtho10-25574","DOIUrl":"https://doi.org/10.5937/univtho10-25574","url":null,"abstract":"Considering the facts that phenolic compounds have many pharmacological effects, as well that antioxidant effect of phenolic compounds has been proven in various experimental systems, aim of this research was to determine the content of total phenols and flavonoids and evaluation of antioxidant activity in ethanol, ethyl acetate and chloroform extracts of fruits and leaves of the plant species Crataegus monogya Jacq., which is known as common hawthorn. The content of total phenolic compounds was determined by the spectrophotometric method using Folin-Ciocalteu reagent and the content of flavonoids was determined using aluminum chloride. In vitro evaluation of the antioxidant activity of tested extracts was performed using the DPPH method. The amount of total phenolics was varied in fruits and leaves extracts and ranged from 38.05 ± 0.18 to 365.11 ± 0.32 mg GAE/g dw. Ethyl acetate extract of hawthorn leaves showed the highest content of phenolic compounds (365.11 ± 0.32 mg GAE/g dw). The flavonoid content was different in the fruits and leaves of hawthorn and ranged from 21.11 ± 0.11 to 122.98 ± 0.21 mg RU/g dw, whereby the highest content of flavonoids was found in ethyl acetate extract of leaves (122.98 ± 0.21 mg RU/g dw). Antioxidant activity of the tested extracts was expressed as IC50 values and ranged from 5.53 ± 0.08 to 293.51 ± 0.28 μg/ml. Ethyl acetate extract of hawthorn leaves showed considerable antioxidant potential (IC50 = 5.53 ± 0.08 μg/ml). Based on the obtained results, a significant correlation was found between the antioxidant activity and the content of total phenolics and flavonoids compounds in hawthorn fruits and leaves extracts.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89309375","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}
引用次数: 3
The external aggregation Newton's method for solving nonlinear equations and applications 外聚集牛顿法求解非线性方程及其应用
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-24982
Marija Paunović, Dejan Ćebić, N. Ralević
Different modified Newton’s methods are widely used in modern computational engineering science, applied mechanics, economics, optimization problems and other disciplines. On the other hand aggregation of information takes a significant place in many knowledge-based systems, where aggregation of data or values is needed. In this paper we theoretically analysed a new modification of Newton’s method based on aggregation function applied on finding multiple roots of nonlinear equations, and numerically verified theoretical results on the examples with simple and multiple roots. Numerical analysis of the proposed approach with obtained results and the related discussion are presented on examples in practice.
各种修正牛顿方法被广泛应用于现代计算工程科学、应用力学、经济学、优化问题等学科。另一方面,信息聚合在许多以知识为基础的系统中占有重要地位,在这些系统中需要对数据或值进行聚合。本文从理论上分析了基于聚集函数的牛顿法的一种新的修正方法在求非线性方程复根中的应用,并通过单根和复根实例对理论结果进行了数值验证。文中对所提出的方法进行了数值分析,并结合实例进行了讨论。
{"title":"The external aggregation Newton's method for solving nonlinear equations and applications","authors":"Marija Paunović, Dejan Ćebić, N. Ralević","doi":"10.5937/univtho10-24982","DOIUrl":"https://doi.org/10.5937/univtho10-24982","url":null,"abstract":"Different modified Newton’s methods are widely used in modern computational engineering science, applied mechanics, economics, optimization problems and other disciplines. On the other hand aggregation of information takes a significant place in many knowledge-based systems, where aggregation of data or values is needed. In this paper we theoretically analysed a new modification of Newton’s method based on aggregation function applied on finding multiple roots of nonlinear equations, and numerically verified theoretical results on the examples with simple and multiple roots. Numerical analysis of the proposed approach with obtained results and the related discussion are presented on examples in practice.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"41 1","pages":"44-50"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71151643","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}
引用次数: 0
Effect of detergents on alkaline invertase and alkaline phosphatase activity of fungi Mucor plumbeus Bonord, 1864, Aspergillus Niger Tiegh, 1867 and Trichoderma harzianum Rifai, 1969 洗涤剂对真菌毛霉(Mucor plumbeus Bonord, 1864)、黑曲霉(Aspergillus Niger Tiegh, 1867)和哈茨木霉(Trichoderma harzianum Rifai, 1969)碱性转化酶和碱性磷酸酶活性的影响
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-21042
Ivana Matović-Purić, T. Jakšić, T. Mihajilov-Krstev, P. Vasić
Due to their diverse metabolic potential, many filamentous fungi have a great ability for degradation of different waste substances. The present research was aimed to investigate ability of fungi Mucor plumbeus, Aspergillus niger and Trichoderma harzianum, isolated from sewer and industrial waste water, to conduct degradation of high concentrations of commercial detergent (0.3%). Within enzyme extracts of samples taken during period of 3–16 days, activity of alkaline invertase and alkaline phosphatase was followed spectrophotometrically at room temperature. Obtained results proved that all examined fungi affected degradation of detergent. Quality (inhibition/stimulation) and quantity of action of detergent on activity of investigated enzymes depended on fungal species and incubation period. The highest inhibiting effect of detergent was recorded on 9 day of incubation in samples of T. harzianum and A. niger, while its most obvious stimulating effect was noticed on 3 day of incubation in samples of T. harzianum and M. plumbeus. Investigated fungi can be used for purification of waste water containing high concentrations of detergent.
由于丝状真菌具有不同的代谢潜力,许多丝状真菌对不同的废物物质具有很强的降解能力。本研究旨在研究从下水道和工业废水中分离的铅毛霉、黑曲霉和哈兹木霉对高浓度(0.3%)商业洗涤剂的降解能力。取3 ~ 16 d的样品,在室温下分光光度法测定碱性转化酶和碱性磷酸酶的活性。所得结果证明,所有检测的真菌都影响洗涤剂的降解。洗涤剂的质量(抑制/刺激)和作用量对所研究酶的活性取决于真菌种类和潜伏期。洗涤剂对哈氏弧菌和黑僵菌的抑制作用在培养第9天达到最大,对哈氏弧菌和铅竖杆菌的刺激作用在培养第3天达到最明显。所研究的真菌可用于净化含有高浓度洗涤剂的废水。
{"title":"Effect of detergents on alkaline invertase and alkaline phosphatase activity of fungi Mucor plumbeus Bonord, 1864, Aspergillus Niger Tiegh, 1867 and Trichoderma harzianum Rifai, 1969","authors":"Ivana Matović-Purić, T. Jakšić, T. Mihajilov-Krstev, P. Vasić","doi":"10.5937/univtho10-21042","DOIUrl":"https://doi.org/10.5937/univtho10-21042","url":null,"abstract":"Due to their diverse metabolic potential, many filamentous fungi have a great ability for degradation of different waste substances. The present research was aimed to investigate ability of fungi Mucor plumbeus, Aspergillus niger and Trichoderma harzianum, isolated from sewer and industrial waste water, to conduct degradation of high concentrations of commercial detergent (0.3%). Within enzyme extracts of samples taken during period of 3–16 days, activity of alkaline invertase and alkaline phosphatase was followed spectrophotometrically at room temperature. Obtained results proved that all examined fungi affected degradation of detergent. Quality (inhibition/stimulation) and quantity of action of detergent on activity of investigated enzymes depended on fungal species and incubation period. The highest inhibiting effect of detergent was recorded on 9 day of incubation in samples of T. harzianum and A. niger, while its most obvious stimulating effect was noticed on 3 day of incubation in samples of T. harzianum and M. plumbeus. Investigated fungi can be used for purification of waste water containing high concentrations of detergent.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"10 1","pages":"13-19"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71151872","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}
引用次数: 0
Cooperative mobile data collection in smart cities 智慧城市协同移动数据采集
Pub Date : 2020-01-01 DOI: 10.5937/univtho10-25351
I. Senturk
Smart cities are driven by huge amount of data collected from sensors deployed across the city. Sensors typically form a multi-hop network with a base station (BS ) in order to send their data to the command and control center. However, sparse deployment of sensors can leave subsets of the network partitioned from the rest of the network. In such a case, isolated partitions cannot forward their data to the BS . Consequently, network coverage and data fidelity decline. A possible solution to link partitions and provide connectivity is employing mobile data collectors (MDCs). A smart vehicle supporting wireless communication can act as an MDC and carry data between sensors and the BS . Using a single MDC extends the average tour length. To minimize the maximum tour length, multiple MDCs can be employed. To identify sensors to be visited by each MDC, this paper clusters partitions as many as the number of MDCs and assigns an MDC for each cluster. Then two different cooperative data collection schemes are considered based on the availability of inter-MDC data exchange. If MDCs collaborate in data delivery, they meet at certain meeting points for data exchange. Such a cooperation avoids the requirement of visiting the BS for some MDCs and reduces tour lengths. On the other hand, MDCs closer to the BS can experience data loss due to buffer overflow given the higher volume of the accumulated data. Presented approaches are evaluated in terms of maximum tour length, data latency, and data loss. The smart city application is simulated with deployment of sensors on certain amenity types. Geographic data is obtained from a volunteered geographic information system and MDC mobility is restricted with the road network. Obtained results indicate that MDC cooperation decreases maximum tour length at the expense of increased rate of data loss and data latency.
智能城市是由部署在城市各处的传感器收集的大量数据驱动的。传感器通常与基站(BS)组成多跳网络,以便将其数据发送到指挥和控制中心。然而,传感器的稀疏部署可能会使网络的子集与网络的其余部分分开。在这种情况下,隔离的分区无法将其数据转发到BS。因此,网络覆盖率和数据保真度下降。连接分区和提供连接的一个可能的解决方案是使用移动数据收集器(mdc)。支持无线通信的智能汽车可以充当MDC,在传感器和BS之间传输数据。使用单个MDC可以延长平均行程长度。为了最小化最大行程长度,可以使用多个mdc。为了识别每个MDC要访问的传感器,本文按照MDC的数量进行集群分区,并为每个集群分配一个MDC。然后基于mdc间数据交换的可用性,考虑了两种不同的协同数据收集方案。如果mdc在数据交付方面进行协作,它们在某些会议点举行会议以进行数据交换。这样的合作避免了一些mdc访问BS的要求,缩短了行程。另一方面,由于累积数据量较大,靠近BS的mdc可能会由于缓冲区溢出而丢失数据。提出的方法在最大行程长度、数据延迟和数据丢失方面进行了评估。通过在某些设施类型上部署传感器来模拟智能城市应用。地理数据是从一个自愿的地理信息系统中获得的,MDC的移动性受到路网的限制。得到的结果表明,MDC协作减少了最大行程长度,但代价是增加了数据丢失率和数据延迟。
{"title":"Cooperative mobile data collection in smart cities","authors":"I. Senturk","doi":"10.5937/univtho10-25351","DOIUrl":"https://doi.org/10.5937/univtho10-25351","url":null,"abstract":"Smart cities are driven by huge amount of data collected from sensors deployed across the city. Sensors typically form a multi-hop network with a base station (BS ) in order to send their data to the command and control center. However, sparse deployment of sensors can leave subsets of the network partitioned from the rest of the network. In such a case, isolated partitions cannot forward their data to the BS . Consequently, network coverage and data fidelity decline. A possible solution to link partitions and provide connectivity is employing mobile data collectors (MDCs). A smart vehicle supporting wireless communication can act as an MDC and carry data between sensors and the BS . Using a single MDC extends the average tour length. To minimize the maximum tour length, multiple MDCs can be employed. To identify sensors to be visited by each MDC, this paper clusters partitions as many as the number of MDCs and assigns an MDC for each cluster. Then two different cooperative data collection schemes are considered based on the availability of inter-MDC data exchange. If MDCs collaborate in data delivery, they meet at certain meeting points for data exchange. Such a cooperation avoids the requirement of visiting the BS for some MDCs and reduces tour lengths. On the other hand, MDCs closer to the BS can experience data loss due to buffer overflow given the higher volume of the accumulated data. Presented approaches are evaluated in terms of maximum tour length, data latency, and data loss. The smart city application is simulated with deployment of sensors on certain amenity types. Geographic data is obtained from a volunteered geographic information system and MDC mobility is restricted with the road network. Obtained results indicate that MDC cooperation decreases maximum tour length at the expense of increased rate of data loss and data latency.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"10 1","pages":"63-68"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71152171","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}
引用次数: 0
期刊
The University Thought - Publication in Natural Sciences
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1