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Analele Universităţii "Dunărea de Jos" din Galaţi最新文献

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An implemented algorithm for computing the distributive lattice associated to a Cohen-Macaulay bipartite graph 一种计算Cohen-Macaulay二部图分配格的实现算法
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.08
Cristian Ion
{"title":"An implemented algorithm for computing the distributive lattice associated to a Cohen-Macaulay bipartite graph","authors":"Cristian Ion","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.08","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.08","url":null,"abstract":"We give an implemented algorithm for computing the distributive lattice associated to a Cohen-Macaulay bipartite graph and, consequently, the set of all minimal vertex covers of a Cohen-Macaulay bipartite graph.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070671","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
Numerical solutions of the differential equations 微分方程的数值解
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.07
Nina N. Cazacu
{"title":"Numerical solutions of the differential equations","authors":"Nina N. Cazacu","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.07","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.07","url":null,"abstract":"In this paper, we propose to study the numerical integration of Cauchy's problem (PC-in short) for a system of differential equations of the first order by the method of successive approximations and the method of the polygonal line, the best known in practice. For example, the methods are applied to some particular functions. The novelty of this paper consists, mainly, in the translation of existing approximation methods into C++ code, in order to visualize the results including the graphic image of both approximate and exact values trajectories, for comparison.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070674","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
SEM-EDX analysis of paper, leather and metal lock from an 18th century church book 对18世纪教堂书籍中的纸张、皮革和金属锁进行SEM-EDX分析
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.09
Alina Sion, Valerica Chitic, Antoaneta Ene
{"title":"SEM-EDX analysis of paper, leather and metal lock from an 18th century church book","authors":"Alina Sion, Valerica Chitic, Antoaneta Ene","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.09","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.09","url":null,"abstract":"In this article paper, leather from book cover and metal lock from an 18th century church book were studied. The book was printed during the time of Mihai Constantin Șuțu, with the blessing of the Metropolitan of Moldova, Iacov Stamati. The analytical method used to study the components and the methods of obtaining all the important parts was the non-destructive technique SEM-EDX. The results regarding the used paper showed typical intermeshed cellulose fibers. In the case of leather, due to its advanced state of degradation, it was impossible to determine the type of animal from which the skin was used. The elemental analyses (EDX) of the metal lock indicated that it was made of brass. The results of the study of 18th century parts of the book, gave important information about the way of paper manufacture, the conservation state of the cover and the way that the metal lock was made and the safe way to clean it in the restoration and conservation process.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070673","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
Spectral identification of cannabinoids 大麻素的光谱鉴定
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.02
Cristina Paraschiv, Mirela Praisler
{"title":"Spectral identification of cannabinoids","authors":"Cristina Paraschiv, Mirela Praisler","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.02","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.02","url":null,"abstract":"The combination of infrared spectroscopy and chemometrics has become a popular method of detection and / or identification of illicit substances. This review paper highlights the most frequently used analytical tools in this research area, focusing on the identification of synthetic or natural cannabinoids.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070668","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
The effect of road and railway traffic on the soil quality from the Public Garden of Galati, Romania 公路和铁路交通对罗马尼亚加拉蒂公共花园土壤质量的影响
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.06
Alina Sion, Andreea-Cătălina Gîrmacea, Antoaneta Ene, Mihaela Timofti
{"title":"The effect of road and railway traffic on the soil quality from the Public Garden of Galati, Romania","authors":"Alina Sion, Andreea-Cătălina Gîrmacea, Antoaneta Ene, Mihaela Timofti","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.06","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.06","url":null,"abstract":"In this article are studied samples of soil collected from Public Garden of Galați, Romania. This location was chosen to observe the negative influence of road and railway traffic on the soil quality. The soil samples were collected from the surface (0 cm), 5 and 30 cm, from the all four principal and secondary garden entrances and one sample from the playground area. The analytical method used to study the soil samples was X-ray fluorescence spectrometry (XRF), a non-destructive technique and very popular in environmental studies, that provided qualitatively and quantitatively information of the elements contained in soil. The results presented a strongly negative influence on soil quality from the road traffic, but the railway traffic didn’t have a strong impact on the soil quality because it was related to person transfer.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136071722","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
Evaluation of physico-chemical parameters of some psychoactive compounds based on molecular modeling 基于分子模拟的精神活性化合物理化参数评价
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.01
Iulia-Florentina Darie, Steluta Gosav, Mirela Praisler
{"title":"Evaluation of physico-chemical parameters of some psychoactive compounds based on molecular modeling","authors":"Iulia-Florentina Darie, Steluta Gosav, Mirela Praisler","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.01","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.01","url":null,"abstract":"In this paper we have evaluated from a physico-chemical point of view some psychoactive compounds representing substituted phenethylamines which contain methoxy groups on the 2 and 5 positions of a benzene ring. The chemical potential of the investigated compounds was assessed by computing of the main quantum molecular descriptors, such as the dipole moment, the energy of the highest/lowest occupied/unoccupied molecular orbital, the gap energy, the electronegativity, the chemical hardness/softness, the electrophilicity index etc. Also, the presence of the nucleophilic and electrophilic sites was identified by using the molecular electrostatic potential diagram.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070667","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
The study on the residential radon concentration in the rooms in the areas of the Republic of Moldova 摩尔多瓦共和国各地区住宅室内氡浓度的研究
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.04
Aurelia Ababii
{"title":"The study on the residential radon concentration in the rooms in the areas of the Republic of Moldova","authors":"Aurelia Ababii","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.04","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.04","url":null,"abstract":"Natural radioactivity is still a topic addressed at the international level with multiple segments interspersed in the upward pace of technological and economic development at the local level. The intensity of concerns in the aspect of radioprotection starts from a series of factors that condition the level and doses of exposure of the population to sources of ionizing radiation, thus determining the medical, social, economic and demographic effects in the characteristic of a medico-social problem. Radon, through its contribution to the creation of the natural radioactive background, has a crucial role in the etiology of oncological diseases of broncho-pulmonary origin, leukemias and other pathologies. Long-term exposure to increased concentrations of radon and the association of other risk factors, such as tobacco consumption, causes the alteration of cellular metabolism processes, the damage of DNA and RNA nucleic acids, the formation of free radicals and the appearance of mutations that can constantly trigger lung cancer. The continuous monitoring of residential radon concentrations is a primary objective within the strategy to control and reduce the long-term negative effects of radon, being a main element of the action plan of the EURATOM Directive 59/2013.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070669","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
The study on the possibility of using sewage sludge in the ecological reconstruction of contaminated sites from the petroleum industry 利用污泥进行石油工业污染场地生态重建的可能性研究
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.05
Cristian Mugurel Iorga, Maria Cătălina Ţopa, Mihaela Marilena Stancu
{"title":"The study on the possibility of using sewage sludge in the ecological reconstruction of contaminated sites from the petroleum industry","authors":"Cristian Mugurel Iorga, Maria Cătălina Ţopa, Mihaela Marilena Stancu","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.05","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.05","url":null,"abstract":"One field of activity that pollutes important land surfaces with hydrocarbons is the petroleum industry. In the ecological reconstruction of contaminated sites from the petroleum industry, natural geological resources are used to fill the excavations resulting from the decommissioning of some equipment and installations. Increasing amounts of sewage sludge are generated by the growing number of municipal wastewater treatment plants. For this reason, solutions are being sought for the elimination or utilization of sewage sludge. For the decontamination of soils polluted with petroleum hydrocarbons, bioremediation technologies with the help of microorganisms, especially bacteria are used on a large scale. From  the results carried out in the present study, it appears that sewage sludge has microbiological, agrochemical, and geotechnical characteristics, which could make possible their utilization for the ecological reconstruction of sites contaminated with petroleum hydrocarbon. Thus, it would be possible to capitalize on the sewage sludge in the petroleum industry.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070670","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
Retina image assessment for microstructural difference detection 视网膜图像评估用于显微结构差异检测
Analele Universităţii "Dunărea de Jos" din Galaţi Pub Date : 2023-09-11 DOI: 10.35219/ann-ugal-math-phys-mec.2023.1.03
Andreea-Monica Dincă Lăzărescu, Simona Moldovanu, Luminita Moraru
{"title":"Retina image assessment for microstructural difference detection","authors":"Andreea-Monica Dincă Lăzărescu, Simona Moldovanu, Luminita Moraru","doi":"10.35219/ann-ugal-math-phys-mec.2023.1.03","DOIUrl":"https://doi.org/10.35219/ann-ugal-math-phys-mec.2023.1.03","url":null,"abstract":"The dissimilarities in appearance of the iris texture patters can improve the individual’s recognition and can strength the capabilities of multibiometrics systems. There is an important within-person variation or intraclass variation that produces different patters such as the geometry or iris pigmentation details that change over time or could be different when the right iris and left iris are analyzed. Moreover, the sensing environment such as ambient lighting variations, eye rotation due to the head tilt or inconsistent iris size due to the distance from the camera can also introduce within-person variation. In this paper, we apply the fuzzy edges detection, in a comparative fashion between right iris and left iris, to find the interoperability capability of a particular biometric trait determined primarily by genotype. In other words, we investigated the degree of variation of the irises of the same person. The structural similarity index measure (SSIM) is implemented to investigate the structural similarity between two iris codes. Prior to the similarity analysis, the segmented iris (i.e., annular area between pupil and sclera) is the edges detection based on the fuzzy edge is performed. This operation allows comparisons between the right iris and left iris without any influence of the stretch or dilation of the pupil induced by different illumination conditions. Also, we can estimate if the left and right irises belong to the same or to different individuals. The proposed approach is tested on the MMU1 Iris Database (with 225 images of the left eye and 225 images of the right eye). An average SSIM value of 0.9216, indicates that proposed iris biometrics model effectively differentiates between left and right eyes of the same person. Also, this result indicates that there is recognizable similarity between left and right irises. These results could be useful for certain applications devoted to detect anomalies in the human irises that could be associated to various diseases.","PeriodicalId":486379,"journal":{"name":"Analele Universităţii \"Dunărea de Jos\" din Galaţi","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070672","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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