Hemijska Industrija最新文献_第6页

EDX analyisis of metal-ceramic interfaces of recasted nickel-chromium dental alloys 重铸镍铬牙科合金金属陶瓷界面的EDX分析

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2018-01-01 DOI: 10.2298/hemind180103009s

B. Štefanovič, R. Lazić, J. Mirković, E. Taso, M. Simeunovic, Z. Nešić

引用次数: 1

Analysis and simulation of bioaccumulation of selected metals from contaminated soil 污染土壤中选定金属的生物积累分析与模拟

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2018-01-01 DOI: 10.2298/hemind171009001b

M. L. Babinčev, Miljana S. Marković, Dragana B. Radosavljević

引用次数: 0

Transport of silver nanoparticles from nanocomposite Ag/alginate hydrogels under conditions mimicking tissue implantation 模拟组织植入条件下银/海藻酸盐纳米复合水凝胶中银纳米颗粒的运输

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2017-11-12 DOI: 10.2298/HEMIND160713049K

D. Kostić, Ivana Malagurski, B. Obradovic

{"title":"Transport of silver nanoparticles from nanocomposite Ag/alginate hydrogels under conditions mimicking tissue implantation","authors":"D. Kostić, Ivana Malagurski, B. Obradovic","doi":"10.2298/HEMIND160713049K","DOIUrl":"https://doi.org/10.2298/HEMIND160713049K","url":null,"abstract":"The aim of this work was to assess phenomena occurring during AgNP transport from nanocomposite Ag/alginate hydrogels under conditions relevant for potential biomedical applications as antimicrobial soft tissue implants. First, we have studied AgNP migration from the nanocomposite to the adjacent alginate hydrogel mimicking soft tissue next to the implant. AgNP deposition was carried out by the initial burst release lasting for ~24 h yielding large aggregates on hydrogel surfaces and smaller clusters (~400 nm in size) inside. However, the overall released content was low (0.67%) indicating high nanocomposite stability. In the next experimental series, release of AgNPs, 10–30 nm in size, from Ag/alginate microbeads in water was investigated under static conditions as well as under continuous perfusion mimicking vascularized tissues. Mathematical modeling has revealed AgNP release by diffusion under static conditions with the diffusion coefficient within the Ag/alginate hydrogel of 6.9´10 –19 m 2 s –1 . Conversely, continuous perfusion induced increased AgNP release by convection with the interstitial fluid velocity estimated as 4.6 nm s –1 . Overall, the obtained results indicated the influence of hydrodynamic conditions at the implantation site on silver release and potential implant functionality, which should be investigated at the experimentation beginning using appropriate in vitro systems.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45787296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Effects of solvent extraction system on antioxidant activity of Lamium purpureum L. 溶剂萃取体系对紫Lamium purpureum L抗氧化活性的影响。

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2017-11-12 DOI: 10.2298/HEMIND160518047G

M. Grujic, M. Dzamic, D. Mitic, V. Stankov-Jovanović, P. Marin, S. Stojanovic

{"title":"Effects of solvent extraction system on antioxidant activity of Lamium purpureum L.","authors":"M. Grujic, M. Dzamic, D. Mitic, V. Stankov-Jovanović, P. Marin, S. Stojanovic","doi":"10.2298/HEMIND160518047G","DOIUrl":"https://doi.org/10.2298/HEMIND160518047G","url":null,"abstract":"Antioxidant and free radical scavenging activity of methanol, ethanol, ethyl acetate and chloroform extracts of aerial parts of Lamium purpureum L. was determined by DPPH, ABTS,FRAP and TRP assays. Contents of flavonoids and phenols were also investigated. The total phenolic content in the extracts, determined using Folin–Ciocalteu assay, ranged between 8.57 to 128.00 mg GAE/g d.e. while concentrations of flavonoids in the extracts varied from 24.20 to 39.80 mg QuE/g d.e. The highest phenolic content was found in methanol extract (128.00 mg GAE/g d.e.). The highest content of total flavonoids was identified in the methanol extract (39.80 mg QuE/g d.e.) and the lowest was in the chloroform (24.30 mg QuE/g d.e.). DPPH scavenging of the extracts was determined and obtained IC 50 values ranged from 0.12 to 3.12 mg/mL of solution. The values of ABTS radical scavenging activity ranged from 0.35 to 1.80 mg AA/g. The highest ABTS antiradical activity was registered for methanol extract. The FRAP value was found within the range 0.08 to 1.04 µmol Fe/mg. The best radical scavenger was methanol (1.04 µmol Fe/mg). In reducing power assay different extracts of L. purpureum showed increasing of activity with increased concentration, and all extracts possessed substantial dose dependent antioxidant activity. The best reducing capacity was obtained with methanol extract of L. purpureum (0.0132 mg AA/mL). The results in this study confirmed that L. purpureum possesses moderate antioxidant properties.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44734493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Plate heat exchanger design software for industrial and educational applications 板式热交换器设计软件的工业和教育应用

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2017-11-12 DOI: 10.2298/HEMIND161021007Z

Nikola Zlatkovic, D. Majstorović, M. Kijevčanin, E. Živković

{"title":"Plate heat exchanger design software for industrial and educational applications","authors":"Nikola Zlatkovic, D. Majstorović, M. Kijevčanin, E. Živković","doi":"10.2298/HEMIND161021007Z","DOIUrl":"https://doi.org/10.2298/HEMIND161021007Z","url":null,"abstract":"Plate heat exchanger is a type of heat exchanger that uses corrugated metal plates to transfer heat between two fluids. The plate corrugations are designed to achieve turbulence across the entire heat transfer area thus producing the highest possible heat transfer coefficients while allowing close temperature approaches. Subsequently, this leads to a smaller heat transfer area, smaller units and in some cases, fewer heat exchangers. In this work, an application for thermal and hydraulic computations of plate heat exchangers had been developed using Sharp Develop, an open source programming platform. During the development process, several literature methods and correlations for calculation of heat transfer coefficient and pressure drop in a plate heat exchanger have been tested and the selected four methods: Martin, VDI, Kumar and Coulson and Richardson have been incorporated into the software. The structure of the software is visually presented through several windows: a window for inserting input data, windows for showing the results of computation by each of the methods, a window for showing comparative analysis of the most important computation results obtained by all of the used methods and a help window for demonstrating the working principle of plate heat exchanger.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42420356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of thermomechanical processing regime on the mechanical properties and electrical conductivity of PdNi5 alloy 热处理工艺对PdNi5合金力学性能和电导率的影响

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2017-11-12 DOI: 10.2298/HEMIND151126004C

Vesna V. Cvetković-Stamenković, D. Manasijević, S. Marjanović, A. Ivanović, B. Trumić, Vesna Marjanovic, Milan M. Jovanović

{"title":"Influence of thermomechanical processing regime on the mechanical properties and electrical conductivity of PdNi5 alloy","authors":"Vesna V. Cvetković-Stamenković, D. Manasijević, S. Marjanović, A. Ivanović, B. Trumić, Vesna Marjanovic, Milan M. Jovanović","doi":"10.2298/HEMIND151126004C","DOIUrl":"https://doi.org/10.2298/HEMIND151126004C","url":null,"abstract":"Ovaj rad obuhvata eksperimentalna i analiticka ispitivanja uticaja termomehanickog režima prerade na mehanicke osobine i elektricnu provodljivost PdNi5 legure, u obliku žice O 0,15 mm, za izradu katalizatora–hvataca. Ispitivanja pokazuju da mehanicke osobine i elektricna provodljivost zavise od primenjenog režima termomehanicke prerade. Poznavanje zavisnosti uticaja parametara termomehanickog režima prerade na ove osobine omogucava proizvodnju PdNi5 legure zahtevanih karakteristika za primenu u procesu kataliticke oksidacije amonijaka, odnosno resavanje problema gubitka platinskih metala, pre svega platine. Rezultati analitickog ispitivanja uticaja termomehanickog režima prerade softverskim paketom SPSS na zateznu cvrstocu, izduženje i elektricnu provodljivost PdNi5 legure u obliku žice O 0,15 mm pokazali su da se primenom linearne regresione analize na adekvatan nacin mogu opisati i analizirati međusobni uticaji izabranih parametara termomehanicke obrade na mehanicke osobine i elektricnu provodljivost PdNi5 legure. Dobijeni rezultati ukazuju da se zatezna cvrstoca i elektricna provodljivost neznatno menjaju sa promenom temperature i vremena žarenja dok izduženje znacajno raste sa povecanjem vremena žarenja.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47643339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of significant pressures and assessment of wastewater discharge on Krivaja River water quality 克里瓦贾河污水排放对水质影响的压力识别及评价

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2017-11-12 DOI: 10.2298/HEMIND160603002P

Z. Pešić, R. M. Becelic-Tomin, V. Kerkez, D. Dalmacija, M. Krčmar, P. Maletic, S. Varga

{"title":"Identification of significant pressures and assessment of wastewater discharge on Krivaja River water quality","authors":"Z. Pešić, R. M. Becelic-Tomin, V. Kerkez, D. Dalmacija, M. Krčmar, P. Maletic, S. Varga","doi":"10.2298/HEMIND160603002P","DOIUrl":"https://doi.org/10.2298/HEMIND160603002P","url":null,"abstract":"Procena uticaja ispustanja otpadnih voda je proces koji pomaže da se razume i oceni velicina rizika kao i verovatnoca da dođe do rizika. U radu je primenjen analiticki okvir analize pritisaka i uticaja na reku Krivaju. Za procenu uticaja koristeni su podaci o izvoru i znacaju pritisaka zagađenja iz koncentrisanih izvora i podaci o stanju vodotoka dobijeni na osnovu monitoringa. Kako bi se uzelo u obzir kumulativno opterecenje izvrsen je proracun maksimalnog opterecenja koje reka može da primi, a da ne dođe do narusavanja njenog kvaliteta. Analize kolicine i kvaliteta otpadnih voda ukazuju na znacajne pritiske svih zagađivaca, zbog prekoracenja granicnih vrednosti emisije, pre svega bioloske potrosnje kiseonika i amonijaka. Vecina pokazatelja kvaliteta vode reke Krivaje prekoracuju zahte-vane vrednosti za dobar status. U slucaju parametara kiseonicnog režima i nutrijenata prekoracenje je vece od deset puta, te oni spadaju u parametre visokog rizika. Emitovano opterecenje iz koncentrisanih izvora je vece od prihvatne moci recipijenta pri svakom od merenih proticaja (pri maksimalnom izmerenom protoku opterecenje je 3 puta vece za organske materije i 11 puta za azot). Na osnovu sprovedenog monitoring programa i procene rizika ustanovljeno je da je Krivaja verovatno pod rizikom od nepostizanja zahtevanog kvaliteta vode.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48035730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Desalination by renewable energy: A mini review of the recent patents 可再生能源脱盐：近期专利综述

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2017-11-12 DOI: 10.2298/HEMIND160308008A

A. Al-Rawajfeh, S. Jaber, Hossam Etawi

引用次数: 3

Equilibrium, kinetic and thermodynamic studies of the uptake of copper by layered double hydroxide 层状双氢氧化物吸收铜的平衡、动力学和热力学研究

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2017-11-12 DOI: 10.2298/HEMIND150608005N

Ayawei Nimibofa, E. A. Tobin, S. David, W. Donbebe, Dikio Ezekiel Dixon

引用次数: 4

The evaluation of temperature and pH influences on equilibrium swelling of poly(n-isopropylacrylamide-co-acrylic acid) hydrogels 温度和pH对聚（n-异丙基丙烯酰胺-co-丙烯酸）水凝胶平衡溶胀的影响

IF 0.9 4区工程技术

Hemijska Industrija Pub Date : 2017-11-12 DOI: 10.2298/HEMIND161018001Z

Aleksandar Zdravković, L. Nikolić, S. Ilić-Stojanović, V. Nikolić, S. Savić, A. Kapor

{"title":"The evaluation of temperature and pH influences on equilibrium swelling of poly(n-isopropylacrylamide-co-acrylic acid) hydrogels","authors":"Aleksandar Zdravković, L. Nikolić, S. Ilić-Stojanović, V. Nikolić, S. Savić, A. Kapor","doi":"10.2298/HEMIND161018001Z","DOIUrl":"https://doi.org/10.2298/HEMIND161018001Z","url":null,"abstract":"Hydrogels are synthesized by the method of radical polymerization of monomers: N -isopropylacrylamide (NIPAM) and acrylic acid (AA). Characterization of poly( N -isopropylacrylamide- co -acrylic acid) hydrogels, p(NIPAM/AA), has been performed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and by determination of the swelling behaviour in aqueous solutions at different temperatures (25, 31 and 37 °C) and pH values (2.2, 4.5, 6 and 6.8). After lyophilisation in the solution at pH 6 and temperature of 25 °C, p(NIPAM/AA) hydrogels have rapidly reached equilibrium degree of swelling, α e , in comparison to non-lyophilized samples. The mechanism of solvent transport within matrix in lyophilized samples corresponds to less Fickian diffusion, whereas Super case II diffusion is characteristic for non-lyophilized samples. p(NIPAM/AA) hydrogel with 1.5 mol% of ethylene glycol dimethacrylate (EGDM) at the temperature of 25 °C and pH 6.8, has reached the highest swelling equilibrium degree, α e = 259.8. The results of swelling studies have shown that p(NIPAM/AA) hydrogels can be classified as superabsorbent polymers (SAPs). For the evaluation of pH and temperature influences on synthesized hydrogels swelling, a full three-level experimental design has been used. Two-factor interaction model (2FI) is the most optimal model of a full three-level experimental design for representing the swelling equilibrium degree of p(NIPAM/AA) hydrogels as a function of investigated parameters, i.e., temperature and pH.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42409543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13