Pub Date : 2022-11-01DOI: 10.36120/2587-3644.v13i1.82-99
V. Trifautan, O. Cataraga, V. Coada
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.
{"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}
Pub Date : 2022-11-01DOI: 10.36120/2587-3644.v13i1.133-137
Lora Mosanu-Supac, Nina Liogchii
The paper is dedicated to the 25th anniversary of the death of Professor Pavel Ion Pulbere, PhD in Biological Sciences, Tiraspol State University.
这篇论文是为了纪念蒂拉斯波尔国立大学生物科学博士Pavel Ion Pulbere教授逝世25周年而发表的。
{"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}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.104-110
Inga Titchiev
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.
{"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}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.50-62
A. Suba
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
{"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}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.43-49
A. Dreglea, N. Sidorov, D. Sidorov
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.
{"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}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.19-32
Ya. I. Bihun, R. Petryshyn, I. Skutar, Halyna Melhyk
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.
{"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}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.33-42
A. Pranevich, A. Grin, Yanka Musafirov
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.
{"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}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.82-103
V. Neagu
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.
{"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}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.74-81
Natalia Neagu, M. Popa
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.
{"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}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.111-119
Adela Gorea
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.
{"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}
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