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Acta et commentationes: Ştiinţe Exacte şi ale Naturii最新文献

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The main sources of pollution of Valea Morilor lake which caused the asphygation of fish Valea Morilor湖的主要污染源是造成鱼类窒息
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-11-01 DOI: 10.36120/2587-3644.v13i1.82-99
V. Trifautan, O. Cataraga, V. Coada
{"title":"The main sources of pollution of Valea Morilor lake which caused the asphygation of fish","authors":"V. Trifautan, O. Cataraga, V. Coada","doi":"10.36120/2587-3644.v13i1.82-99","DOIUrl":"https://doi.org/10.36120/2587-3644.v13i1.82-99","url":null,"abstract":"The paper illustrates the role of bioindicators applied to identify the sources and degree of pollution of a water basin. The laboratory test reports, standard methodologies and scientific literature considered as an auxiliary tool for the preparation and planning the sampling campaigns for the assessment of the ecological status of the aquatic environment (including sampling, analysis and microscopy) served as support. There were applied the results of the laboratory analyses from the reports on quality indices and technical report, which include qualitative elements of the general physicochemical conditions, hydromorphological and biological qualitative components from Valea Morilor lake.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114228545","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
Pavel Pulbere - promoter of Biology teaching in the Republic of Moldova 帕维尔·普尔贝尔——摩尔多瓦共和国生物教学的推动者
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-11-01 DOI: 10.36120/2587-3644.v13i1.133-137
Lora Mosanu-Supac, Nina Liogchii
{"title":"Pavel Pulbere - promoter of Biology teaching in the Republic of Moldova","authors":"Lora Mosanu-Supac, Nina Liogchii","doi":"10.36120/2587-3644.v13i1.133-137","DOIUrl":"https://doi.org/10.36120/2587-3644.v13i1.133-137","url":null,"abstract":"The paper is dedicated to the 25th anniversary of the death of Professor Pavel Ion Pulbere, PhD in Biological Sciences, Tiraspol State University.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131527770","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
Petri nets for e-learning. Case studyInga Titchiev Petri网用于电子学习。案例分析，a Titchiev
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-02-01 DOI: 10.36120/2587-3644.v12i2.104-110
Inga Titchiev
{"title":"Petri nets for e-learning. Case studyInga Titchiev","authors":"Inga Titchiev","doi":"10.36120/2587-3644.v12i2.104-110","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.104-110","url":null,"abstract":"The internet technology induces a new style of learning by the rapid development of it. This one is different from the traditional and comes to complete it with new opportunities. The study described in this article has researched the management process of the learning progress and collaborative issues in distance learning by means of Petrinets. A case study is presented.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128990460","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
Real cubic differential systems with a linear center and multiple line at infinity 具有线性中心和无穷远处多重线的实三次微分系统
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-02-01 DOI: 10.36120/2587-3644.v12i2.50-62
A. Suba
{"title":"Real cubic differential systems with a linear center and multiple line at infinity","authors":"A. Suba","doi":"10.36120/2587-3644.v12i2.50-62","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.50-62","url":null,"abstract":"We classify all cubic differential systems with a linear center and multiple line at infinity up to multiplicity four. For every class with the multiplicity of the line at infinity four the center problem is solved. It is proved that the monodromic points are of the center type if the first three Lyapunov quantities vanish","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133505310","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
Construction of solutions of integral equations with Stieltjes functionals and bifurcation parameters 带Stieltjes泛函和分岔参数的积分方程解的构造
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-02-01 DOI: 10.36120/2587-3644.v12i2.43-49
A. Dreglea, N. Sidorov, D. Sidorov
{"title":"Construction of solutions of integral equations with Stieltjes functionals and bifurcation parameters","authors":"A. Dreglea, N. Sidorov, D. Sidorov","doi":"10.36120/2587-3644.v12i2.43-49","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.43-49","url":null,"abstract":"The nonlinear Volterra integral equations with loads on the desired solution are studied. Loads are given using the Stieltjes integrals. The equations contain a parameter, for any value of which the equation has a trivial solution. The necessary and sufficient conditions on the values of the parameter are derived in the neighborhood where theequation has nontrivial real solutions.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129476462","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
Multifrequency system with multipoint and integral conditions 具有多点积分条件的多频系统
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-02-01 DOI: 10.36120/2587-3644.v12i2.19-32
Ya. I. Bihun, R. Petryshyn, I. Skutar, Halyna Melhyk
{"title":"Multifrequency system with multipoint and integral conditions","authors":"Ya. I. Bihun, R. Petryshyn, I. Skutar, Halyna Melhyk","doi":"10.36120/2587-3644.v12i2.19-32","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.19-32","url":null,"abstract":"For the multifrequency system of equations with linear delays and multipoint and integral conditions, the existence and uniqueness of the solution in space is proved.The method of averaging over fast variables is substantiated and the error of the methodis estimated, which obviously depends on the small parameter. The obtained result is illustrated by a model example.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122037830","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: 1
Multiple partial integrals of polynomial Hamiltonian systems 多项式哈密顿系统的多重偏积分
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-02-01 DOI: 10.36120/2587-3644.v12i2.33-42
A. Pranevich, A. Grin, Yanka Musafirov
{"title":"Multiple partial integrals of polynomial Hamiltonian systems","authors":"A. Pranevich, A. Grin, Yanka Musafirov","doi":"10.36120/2587-3644.v12i2.33-42","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.33-42","url":null,"abstract":"We consider an autonomous real polynomial Hamiltonian ordinary differential system. Sufficient conditions for the construction of additional first integrals on polynomial partial integrals and multiple polynomial partial integrals are obtained. Classes of autonomous polynomial Hamiltonian ordinary differential systems with first integrals which analytically expressed by multiple polynomial partial integrals are identified. Also we present examples that illustrate the theoretical results.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134644655","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
Singular integral operators in the case of a piecewise Lyapunov contour 分段李雅普诺夫轮廓的奇异积分算子
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-02-01 DOI: 10.36120/2587-3644.v12i2.82-103
V. Neagu
{"title":"Singular integral operators in the case of a piecewise Lyapunov contour","authors":"V. Neagu","doi":"10.36120/2587-3644.v12i2.82-103","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.82-103","url":null,"abstract":"The article attempts to present the results obtained by the author in recent years (in a number of cases with some additions) on the theory of singular integral equations and Riemann boundary value problems in the case of a piecewise Lyapunov contour. It has a survey character of problems and results related to the influence of corner points of integration contour on various properties of singular operators. At the same time, much attention is paid to the research of other authors related to the scientific interests of the author of this work.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"08 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122268030","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: 1
Lyapunov’s stability of the unperturbed motion governed bythe 李亚普诺夫的无扰动运动的稳定性
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-02-01 DOI: 10.36120/2587-3644.v12i2.74-81
Natalia Neagu, M. Popa
{"title":"Lyapunov’s stability of the unperturbed motion governed bythe","authors":"Natalia Neagu, M. Popa","doi":"10.36120/2587-3644.v12i2.74-81","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.74-81","url":null,"abstract":"There were obtained the conditions of stability after Lyapunov of the unper-turbed motion for the system S3 (1,3) in the non-critical case. It was constructed the Lyapunov series for the ternary differential system S3 (1,3) of Darboux type in the critical case and determined the conditions of stability of the unperturbed motion governed by this system.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134490216","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
Algorithm for assessing the credibility of online information 在线信息可信度评估算法
Acta et commentationes: Ştiinţe Exacte şi ale Naturii Pub Date : 2022-02-01 DOI: 10.36120/2587-3644.v12i2.111-119
Adela Gorea
{"title":"Algorithm for assessing the credibility of online information","authors":"Adela Gorea","doi":"10.36120/2587-3644.v12i2.111-119","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.111-119","url":null,"abstract":"The present paper is devoted to an algorithm for evaluating the data credibility and analyzes a number of available tools for this. During the investigation, it was foundt hat the most tools are used by journalists in doing this. Currently, there are attempts to automate the process of evaluating the information credibility, aimed not only at journalism professionals, but also at the regular user. In this sense, two tools wer eanalyzed: NewsGuard and WOT. The analysis of these tools allows us to determine the mechanisms of collective online analysis (crowdsourcing) in order to evaluate thecredibility of online information with the possible usage of computational intelligence without the mandatory experts’ participation. The developed algorithm takes over the best functions of the studied tools and can be useful for evaluating the data credibility from various websites.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"405 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122858815","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
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