The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science最新文献_第4页

Investigation of Structural Characteristics by FTIR Spectroscopy of Chitosan Derivative with N Heterocyclic Compound N杂环壳聚糖衍生物结构特征的FTIR光谱研究

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-12-15 DOI: 10.35219/mms.2022.4.08

I. F. COSTEA NOUR, F. Sorcaru, G. Cârâc

{"title":"Investigation of Structural Characteristics by FTIR Spectroscopy of Chitosan Derivative with N Heterocyclic Compound","authors":"I. F. COSTEA NOUR, F. Sorcaru, G. Cârâc","doi":"10.35219/mms.2022.4.08","DOIUrl":"https://doi.org/10.35219/mms.2022.4.08","url":null,"abstract":"Chitosan and chitosan derivatives are biomaterials of great scientific interest for biomedical applications although some of the properties are limited as their solubility in the aqueous medium. N-heterocyclic compounds are of interest for chitosan alkylation and new derivatives can be obtained by modification of his structure resulting thus new structures of biomedical interest Chitosan samples from two sources were analysed, in which the dissociation is favoured in the aqueous medium by the presence of a bipyridine salt, N,N'-bis(phenacyl)-4,4'-bipyridinium dibromide. The synthesis of chitosan’ derivate was conducted in aqueous medium at 60 °C, by magnetic stirring for 24 hours. The dissociation is better and reduced the pH, to values lower than pH 6, which suggests the achievement of favourable structural arrangements between chitosan and dibromide bipyridinium. The FTIR spectra parameters indicate the presence of characteristic bands of the bipyridinium salt in the chitosan derivates structures, with structural differences in their composition. \u0000","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82707562","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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Studies on the Use of Electricity to Reduce the Consumption of Coke in the Development of Cast Iron in the Furnace 在高炉铸铁开发中用电降低焦炭消耗的研究

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-12-15 DOI: 10.35219/mms.2022.4.03

M. Neacsu

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Physico-Chemical Analysis of Drinking Water from the Town of Bârlad, Vaslui County 瓦斯卢伊县布尔拉德镇饮用水的理化分析

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-12-15 DOI: 10.35219/mms.2022.4.10

G. Istrate, Irina-Nicoleta Penișoară

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Material Recognition Using CNN Approach for Garbage Collection System 基于CNN方法的垃圾收集系统材料识别

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-12-15 DOI: 10.35219/mms.2022.4.20

F. Marin, M. Marin, G. Gurău

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Consolidation of Central Columns of Civil Multistory Structures to Increase the Critical Buckling Force 民用多层结构中心柱加固提高临界屈曲力

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-12-15 DOI: 10.35219/mms.2022.4.01

M. Botiș, C. Pleșcan

{"title":"Consolidation of Central Columns of Civil Multistory Structures to Increase the Critical Buckling Force","authors":"M. Botiș, C. Pleșcan","doi":"10.35219/mms.2022.4.01","DOIUrl":"https://doi.org/10.35219/mms.2022.4.01","url":null,"abstract":"Civil multi-story structures are used as office buildings or residential buildings. The central pillars on the ground floor of the civil structures will have the largest gravitational load and implicitly will be the pillars most stressed in compression. In this paper, the authors propose to increase the critical buckling load of the central pillars on the ground floor in the event that it is necessary to strengthen these pillars, due to the change in the purpose of the building and the modification of the loads on the floors. To increase the buckling load in the case of these columns, it is proposed to increase the moment of inertia of the columns on the base region. To highlight how the critical loss of stability load changes, a theoretical model is made for the column with constant section and another for the column with variable section in steps. Finally, the results obtained for the critical load will be compared and it will be highlighted what is the increase in buckling load for the pole with variable section in relation to the pole with constant section. \u0000","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82377730","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

Vibro-Acoustic Analysis of a Spherical Joint Using FEM 球面关节振动声分析的有限元方法

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-12-15 DOI: 10.35219/mms.2022.4.04

Doina Boazu

引用次数: 0

Green Synthesis of Metal Nanoparticles using Microalgae: A Review 微藻绿色合成金属纳米颗粒研究进展

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-09-15 DOI: 10.35219/mms.2022.3.03

Rodica CHIHAI (PEȚU), A. Saracu, C. Ungureanu

{"title":"Green Synthesis of Metal Nanoparticles using Microalgae: A Review","authors":"Rodica CHIHAI (PEȚU), A. Saracu, C. Ungureanu","doi":"10.35219/mms.2022.3.03","DOIUrl":"https://doi.org/10.35219/mms.2022.3.03","url":null,"abstract":"Nanometallic materials are metals and alloys that form nanocrystalline grains with particle size of about 5 to100 nm. In materials science, “green synthesis” has become a reliable, sustainable, and eco-friendly protocol for synthesizing a wide range of materials such as metal oxides, hybrids, and bio-inspired materials. Nowadays, a wide range of physico-chemical methods are used for the synthesis of nanoparticles. Green synthesis is found to be superior over physical and hemical method as it is economically feasible, environmentally friendly, scaled up for massscale production without any complexity. Several biological approaches, including the utilization of plant extracts, enzymes, bacteria, fungi, and algae, are being studied in order to enable a more environmentally sound synthesis of nanoparticles. Because these techniques are regarded as safe and environmentally responsible for the production of nanomaterials as an alternative to conventional methods, the development of green methods for the synthesis of nanoparticles is developing into a significant area of nanotechnology. \u0000","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76770027","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

Reducing Gas Emissions from Transport by Introducing Hybrid Electric Vehicles 通过引入混合动力电动汽车来减少交通运输中的气体排放

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-09-15 DOI: 10.35219/mms.2022.3.05

M. Lupchian

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Effect of the Temperature and Oxidation Time on Some Physicochemical Characteristics of the Rice Bran Oil 温度和氧化时间对米糠油理化性质的影响

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-09-15 DOI: 10.35219/mms.2022.3.01

R. Crețu, L. Șolea

{"title":"Effect of the Temperature and Oxidation Time on Some Physicochemical Characteristics of the Rice Bran Oil","authors":"R. Crețu, L. Șolea","doi":"10.35219/mms.2022.3.01","DOIUrl":"https://doi.org/10.35219/mms.2022.3.01","url":null,"abstract":"Due to their excellent characteristics, vegetable oils are successfully used in various formulations of organic lubricants. In this context, the advanced biodegradability and excellent lubricity performance of rice oil leads to its being considered as a real potential for the lubricants industry. However, as with other vegetable oils, the stability of rice bran oil is strongly influenced by the oxidation process. Therefore, the aim of this work was the oxidation stability monitorization of rice bran oil by spectrophotometric techniques. For this purpose, oxidation tests of rice bran oil at elevated temperatures were performed.In this paper, transmittance spectra were determined, and the trichromatic components and coordinates were calculated, as well as the colour differences for rice oils subjected to a forced oxidation treatment at temperatures of 100 °C and 120 °C for 4, 8 and 10 hours. The results obtained show that, although after the first 4 hours of forced oxidation significant changes appear on the physicochemical properties of rice bran oil, an increase in the test time from 8 to 10 hours does not lead to significant changes in the analysed parameters, the conclusion being valid for both test temperatures. \u0000","PeriodicalId":22358,"journal":{"name":"The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science","volume":"185 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72706946","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 Probabilistic Method for Determination the Inertia Characteristics of 3D Bodies with Monte Carlo Algorithms 用蒙特卡罗算法确定三维物体惯性特性的概率方法

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science Pub Date : 2022-09-15 DOI: 10.35219/mms.2022.3.07

M. Botiș, C. Pleșcan

引用次数: 0