Proceedings of the Estonian Academy of Sciences最新文献_第7页

Tribological and circular economy aspects of polypropylene/cotton fibre hybrid composite 聚丙烯/棉纤维混杂复合材料的摩擦学和循环经济方面

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.2.03

M. M. Abbas, T. Ahmad, R. R. Ahranjani, M. Antonov, M. M. Farid, D. Goliandin, A. Hussain, N. Kamboj, I. Krasnou, A. Krumme, R. Kumar, V. Podgursky, M. Viljus

引用次数: 4

Microbiological and chemical properties of shungite water 顺特水的微生物学和化学性质

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.4.06

Silver Türk, Tarmo Tamm, Hugo Mändar, Ain Raal, P. Laurson, U. Mäeorg

{"title":"Microbiological and chemical properties of shungite water","authors":"Silver Türk, Tarmo Tamm, Hugo Mändar, Ain Raal, P. Laurson, U. Mäeorg","doi":"10.3176/proc.2022.4.06","DOIUrl":"https://doi.org/10.3176/proc.2022.4.06","url":null,"abstract":". Abstract. Shungite is used in water filters that remove Escherichia coli from water. The mechanism and spectrum of the antibacterial activity of shungite are not precisely known. In this study, shungite and its dried water extract were characterized by means of X-ray diffraction, X-ray fluorescence and iodometry. The dried residue of the water extract of shungite was relatively poor in carbon (28.1% in the rock vs 0.5% in the residue), silica (23.9% in the rock vs 0.3% in the residue) and potassium (1.14% vs 0.05%), but rich in sulfur (1.6% vs 21.6%) and some metals, including iron (1.4% vs 10%), aluminum (2.1% vs 5%) and nickel (0.02% vs 1.14%). The survival of Escherichia coli , Pseudomonas aeruginosa , Staphylococcus aureus , Candida albicans , Streptococcus uberis and Saccharomyces cerevisiae in shungite water was measured. Escherichia coli , Pseudomonas aeruginosa and Streptococcus uberis did not survive for 24 hours in 3:7 shungite water extract, while Staphylococcus aureus , Candida albicans and Saccharomyces cerevisiae survived as well as in distilled water. Neutralization of pH did not abolish the bactericidal effect. However, in the presence of nutrients, shungite water did not show bacteriostatic or bactericidal effects.","PeriodicalId":54577,"journal":{"name":"Proceedings of the Estonian Academy of Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69934343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Inverse problem to identify a space-dependent diffusivity coefficient in a generalized subdiffusion equation from final data 从最终数据确定广义次扩散方程中空间相关扩散系数的反问题

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.1.01

J. Janno, K. Kasemets, N. Kinash

引用次数: 1

Free vibration analysis of tapered Timoshenko beam with higher order Haar wavelet method 用高阶Haar小波分析锥形Timoshenko梁的自由振动

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.1.07

Marmar Mehrparvar, J. Majak, K. Karjust, Mustafa Arda

{"title":"Free vibration analysis of tapered Timoshenko beam with higher order Haar wavelet method","authors":"Marmar Mehrparvar, J. Majak, K. Karjust, Mustafa Arda","doi":"10.3176/proc.2022.1.07","DOIUrl":"https://doi.org/10.3176/proc.2022.1.07","url":null,"abstract":". In the current study, the higher order Haar wavelet method based formulation is developed for the analysis of the free vibrations of the tapered Timoshenko beam. The clamped-clamped and clamped-pinned boundary conditions are explored and the results with the 4th order and the 6th order of convergence are presented. The results are found to be in good agreement with the corresponding results of the Ritz method. The proposed approach can be considered as the principal improvement of the widely used Haar wavelet method providing the same accuracy with the several magnitudes lower mesh. Thus, the higher order Haar wavelet method has reduced the computational cost in comparison with the widely used Haar wavelet method since the computational complexity of both methods is determined by the mesh used. In the case of the fixed equal mesh used for both methods, the higher order Haar wavelet method results in the several magnitudes lower absolute error without a remarkable increase in computational complexity. The cost needed to pay for higher accuracy is hidden in a certain increase in the implementation complexity compared with the widely used Haar wavelet method.","PeriodicalId":54577,"journal":{"name":"Proceedings of the Estonian Academy of Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69932864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Technical design of aluminium scrap processing machines by utilizing direct exhaust air using conveyor drying system 采用传送带干燥系统直接排风的废铝处理机的技术设计

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.2.01

Y. Ardiani, R. Ariati, E. Erkata Yandri, A. Lomi, P. Pramudito, R. Ronald, R. H. Setyobudi, W. Widodo, M. Zahoor, I. Zekker

引用次数: 3

Analysis of possible faults and diagnostic methods of the Cartesian industrial robot 直角型工业机器人可能出现的故障分析及诊断方法

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.3.04

S. Autsou, K. Kudelina, A. Rassõlkin, T. Vaimann

引用次数: 2

Modified shrinking projection methods in CAT(0) space 改进了CAT(0)空间的收缩投影方法

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.3.07

S. Khatoon, W. Cholamjiak, I. Uddin

引用次数: 1

Bright optical solitons with polynomial law of nonlinear refractive index by Adomian decomposition scheme 用Adomian分解格式求解具有非线性折射率多项式律的明亮光学孤子

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.3.02

H. Alshehri, A. Biswas, O. González-Gaxiola, Y. Yıldırım

引用次数: 8

New miniature microstrip antenna for UWB wireless communications 用于超宽带无线通信的新型微型微带天线

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2022-01-01 DOI: 10.3176/proc.2022.2.06

A. A. Al-Azzawi, A. Al-Hilalli, K. Al-Majdi, A. A. Almukhtar, Y. S. Mezaal

引用次数: 2

The effect of various focal length photographs on eyewitness identification accuracy 不同焦距照片对目击证人识别精度的影响

IF 0.9 4区综合性期刊

Proceedings of the Estonian Academy of Sciences Pub Date : 2021-01-01 DOI: 10.3176/proc.2021.4s.07

E. A. Arras, K. Kask, E. Malleus

引用次数: 0