The University Thought - Publication in Natural Sciences最新文献_第2页

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

The University Thought - Publication in Natural Sciences Pub Date : 2020-06-17 DOI: 10.5937/univtho10-26133

V. Dekić, N. Radulović, Milenko N. Ristić, B. Dekić, Novica R. Ristić

引用次数: 0

Analysis of geodesics on different surfaces 分析不同表面上的测地线

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-20589

M. Maksimović, T. Jovanović, E. Ljajko, Milica Ivanović

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

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-24790

Nikola R. Bačević, A. Valjarević, Dušan Kićović, Nikola Milentijević, M. Ivanović, Meliha Mujević

{"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

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-24774

Nikola Milentijević, Nikola R. Bačević, Dušan Ristić, A. Valjarević, M. Pantelic, Dušan Kićović

{"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)

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-24338

V Nebojša Živić, N. P. Jakšić

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

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-26075

N. Fabiano, S. Radenović

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

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-25574

V. Dekić, Novica R. Ristić, B. Dekić, Milenko N. Ristić

{"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

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-24982

Marija Paunović, Dejan Ćebić, N. Ralević

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

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-21042

Ivana Matović-Purić, T. Jakšić, T. Mihajilov-Krstev, P. Vasić

{"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

The University Thought - Publication in Natural Sciences Pub Date : 2020-01-01 DOI: 10.5937/univtho10-25351

I. Senturk

{"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