Journal of Chemical Technology and Metallurgy最新文献_第3页

SYNTHESIS AND DEICING PERFORMANCE OF CALCIUM MAGNESIUM ACETATE FROM DOLOMITIC LIMESTONE OF ABBOTABAD REGION, PAKISTAN 巴基斯坦阿博塔巴德地区白云质石灰石中醋酸钙镁的合成和除冰性能

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.22

Asma Yamin, W. Rehman, Amin Ur Rahman, Ibrar Ahmed, Muhammad Siddique Afridi

{"title":"SYNTHESIS AND DEICING PERFORMANCE OF CALCIUM MAGNESIUM ACETATE FROM DOLOMITIC LIMESTONE OF ABBOTABAD REGION, PAKISTAN","authors":"Asma Yamin, W. Rehman, Amin Ur Rahman, Ibrar Ahmed, Muhammad Siddique Afridi","doi":"10.59957/jctm.v59.i4.2024.22","DOIUrl":"https://doi.org/10.59957/jctm.v59.i4.2024.22","url":null,"abstract":"Calcium Magnesium Acetate (CMA) has recently gained much popularity due to its emerging applications in road deicing, and as an industrial adsorbent for removal of Hydrogen Sulfide (H2S) gas and other odorous acid gases from gaseous streams. CMA is a multi-purpose, low-corrosion and concrete-safe alternative to the conventionally used sodium chloride (NaCl) deicers. CMA prevents snow and ice from bonding to either surfaces or itself. In the present study, CMA was prepared from dolomitic limestone of Abbottabad region, Pakistan. The prepared samples were characterized through various instrumental techniques like Scanning Electron Microscopy combined with Energy Dispersive X-Ray (SEM-EDX), X-Ray Diffraction (XRD), and Fourier Transform Infra-Red Spectroscopy (FT-IR).The performance of CMA was compared with NaCl. It was found that after 24 hours, 15 %, of ice melted, when no deicing agent was used. Likewise, 49.4 %, and 66.4 % of ice melted, when CMA and NaCl were used as deicing agents, respectively. Thus, the rate of ice melting increased by 70 % and 77.4 %, with CMA and NaCl respectively. The analysis showed that CMA could successfully be produced from dolomitic limestone of Abbottabad, and the same may be applied for deicing applications.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":" 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141674358","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

HEXAFERRITES - SINGLE PHASE MAGNETO-ELECTRIC MULTIFERROICS 六铁氧体 - 单相磁电多铁氧体

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.29

T. Koutzarova, S. Kolev, K. Krezhov, B. Georgieva, C. Ghelev, Todor Cholakov, L. Tran, M. Babij

{"title":"HEXAFERRITES - SINGLE PHASE MAGNETO-ELECTRIC MULTIFERROICS","authors":"T. Koutzarova, S. Kolev, K. Krezhov, B. Georgieva, C. Ghelev, Todor Cholakov, L. Tran, M. Babij","doi":"10.59957/jctm.v59.i4.2024.29","DOIUrl":"https://doi.org/10.59957/jctm.v59.i4.2024.29","url":null,"abstract":"Multiferroic materials are an exceptional class of magnetic materials where long-range magnetic and ferroelectric orders coexist, thus provoking the researchers’ interest from both basic and practical points of view. The magneto-electric multiferroics are materials that combine coupled electric and magnetic dipoles. Recently, research has focused on the occurrence of the magnetoelectric effect in some hexagonal ferrite types and the possibility of their use as single-phase multiferroic and magnetoelectric materials. For many years, various hexaferrites have been intensively studied as materials for permanent magnets, high-density recording media, microwave devices, biomedical applications, etc. The magnetic structure and especially the specific magnetic spin arrangement under certain conditions proved to be key factors for the realization of magneto-electric phases in hexaferrites. Here some recent advances in our studies of the magnetic phase transitions in the Y-type hexaferrites are overviewed. In particular, the influence of the replacement of non-magnetic Me2+ cations with magnetic cations and of magnetic Fe3+ cations with non-magnetic ones on the magnetic properties and occurring magnetic phase transitions in Y-type hexaferrites are exemplified with Ba0.5Sr1.5Zn2Fe12O22.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":" 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141674832","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

CFD MODELLING OF NON-ISOTHERMAL PROTON EXCHANGE MEMBRANE FUEL CELL (PEMFC): ROLE OF BAFFLES 非等温质子交换膜燃料电池（PEMFC）的 CFD 建模：挡板的作用

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.26

Ashraf Ali Basheer, Naveen Ganta

{"title":"CFD MODELLING OF NON-ISOTHERMAL PROTON EXCHANGE MEMBRANE FUEL CELL (PEMFC): ROLE OF BAFFLES","authors":"Ashraf Ali Basheer, Naveen Ganta","doi":"10.59957/jctm.v59.i4.2024.26","DOIUrl":"https://doi.org/10.59957/jctm.v59.i4.2024.26","url":null,"abstract":"Through oxidation (H2) and reduction (O2 ) reactions, the chemical energy of the fuel is converted by proton exchange membrane fuel cell (PEMFC) into electricity and is therefore considered an energy converter. In this work, performance of a PEMFC is numerically investigated using computational fluid dynamics (CFD). To characterize the non-isothermal behavior of PEMFC, 3D transient CFD simulations are performed. The distribution of H2 and O2 mass fractions, temperature, and current density profiles are analyzed for various operational conditions. The optimum condition (voltage = 0.1 V; thickness of gas diffusion layer (GDL) = 0.0127mm; thickness of catalyst layer (CL) = 0.014mm) for an operation of PEMFC is identified Trapezoidal and rectangular baffles are proposed into the flow channels to enhance the performance of PEMFC. The rectangular baffle configuration supports maximum conversion of reactant gases (H2 = 24.16 %, O2 = 41.72 %) in comparison with the trapezoidal baffle. A significant increase in conversion is reported when the number of baffles in the gas flow channel is increases. Thus, PEMFC performance is enhanced with baffle configuration. ","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":" 40","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141676917","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

ANALYSIS OF THE DOCKING RESULTS OF SOME SELECTIVE MOR LIGANDS 一些选择性摩尔配体的对接结果分析

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.18

T. Dzimbova, Fatima Sapundzhi, P. Milanov

{"title":"ANALYSIS OF THE DOCKING RESULTS OF SOME SELECTIVE MOR LIGANDS","authors":"T. Dzimbova, Fatima Sapundzhi, P. Milanov","doi":"10.59957/jctm.v59.i4.2024.18","DOIUrl":"https://doi.org/10.59957/jctm.v59.i4.2024.18","url":null,"abstract":"Endogenous opioids produce the same effects as the chemicals known as classic alkaloid opiates, which includemorphine and heroin. Endogenous opioid peptides function both as hormones and as neuromodulators. The aim ofthe present study was to analyze the results of docking of ligands with MOR to identify the key elements requiredfor selectivity. Many of the ligands have been synthesized and biologically tested by our colleagues. The other partis compounds known in the literature. The analysis of the obtained ligand-receptor complexes makes it possible todetermine the key structural elements associated with the manifestation of specificity with respect to the receptor.These results will assist in the design of new compounds with potential MOR agonistic or antagonistic effects. In order to be active and effective, a ligand must have certain properties. First, it must be stable in a biological environment so that it can reach the place where it will manifest its action. Second, be of a suitable structure to allow it to reach and interact with the receptor’s binding site. Third, upon binding, the resulting ligand-receptor complex should be stable, i.e. its energy to be small. Fourth, the ligand induces the appropriate conformations in the receptor molecule upon interaction, i.e. to bind to precisely defined amino acid residues. Therefore, the present study aims to analyze the docking results of dalargine derivatives with MOR and determine the necessary conditions for the manifestation of the biological effect.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":" 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141673705","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

UTILIZATION OF JORDANIAN OIL SHALE ASH IN ASPHALT MIX: ENVIRONMENTAL IMPACT ASSESSMENT 在沥青混合料中利用约旦油页岩灰：环境影响评估

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.25

Rozalya Alhunity, Emad El Qada, Salah H. Aljbour

引用次数: 0

REMOVAL OF PHOSPHATES ON LOW BASIC ANIONITE DOWEX MARATHON WBA 用低碱性阴离子石 dowex 马拉松 wba 去除磷酸盐

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.21

I. Trus, Yana Kryzhanovska, M. Gomelya

引用次数: 0

EVALUATION OF MEASUREMENT UNCERTAINTY ASSOCIATED WITH THE SAMPLE PREPARATION PROCEDURE 评估与样品制备程序相关的测量不确定性

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.27

Ava Amideina, Petranka Petrova, Mitja Kolar, Jernej Imperl, Petko Mandjukov

{"title":"EVALUATION OF MEASUREMENT UNCERTAINTY ASSOCIATED WITH THE SAMPLE PREPARATION PROCEDURE","authors":"Ava Amideina, Petranka Petrova, Mitja Kolar, Jernej Imperl, Petko Mandjukov","doi":"10.59957/jctm.v59.i4.2024.27","DOIUrl":"https://doi.org/10.59957/jctm.v59.i4.2024.27","url":null,"abstract":"The measurement uncertainty (MU) in environmental analyses is usually considered as a combination of the additive contributions from sampling, sample preparation and analytical measurement (usually instrumental). The target MU for such studies is usually relatively high due to the natural sample heterogeneity and/or the complicated pretreatment procedure required. In the analytical practice, the contribution of the sample preparation to MU is rarely evaluated. Thus, it remains a hidden part of the one related to the analysis. However, the knowledge for the contribution of sample preparation might provide important information and further possibility for optimization of the entire analytical procedure and reduction of the expanded MU of the analytical result. From statistical point of view, the separation of uncertainty contributions from the different steps is, generally, not a trivial task. Selection of the proper statistical approach depends on the data structure and quality, variables distribution, etc. In the present study, three different statistical methods for evaluation of the uncertainty contribution of the sample preparation were applied, compared, and discussed. The considered approaches are based on, both, classical and robust analysis of variances (ANOVA) applied to data from instrumental analysis of marine algae and bee honey samples, undergoing microwave digestion. Some general recommendations on the statistical approach selection are revealed based on real experimental data set.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":" 41","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141675975","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

ISOLATION AND CHARACTERIZATION OF PEPTIDES FROM MILK AS NATURAL INHIBITORS OF ACE I AND FOOD ADDITIVES 从牛奶中分离肽并确定其特性，将其作为 Ace I 天然抑制剂和食品添加剂

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.5

B. Yakimova, Ralitza Alexova, Lili Dobreva, Yuliana Rainova, Stefan Dobrev, Svetla Danova, Silvia Angelova, I. Stoineva

{"title":"ISOLATION AND CHARACTERIZATION OF PEPTIDES FROM MILK AS NATURAL INHIBITORS OF ACE I AND FOOD ADDITIVES","authors":"B. Yakimova, Ralitza Alexova, Lili Dobreva, Yuliana Rainova, Stefan Dobrev, Svetla Danova, Silvia Angelova, I. Stoineva","doi":"10.59957/jctm.v59.i4.2024.5","DOIUrl":"https://doi.org/10.59957/jctm.v59.i4.2024.5","url":null,"abstract":"Inhibition of Angiotensin-converting enzyme I (ACE I) is a modern therapeutic approach to treatment of hypertension. In recent years, research into natural ACE peptide inhibitors without side effects has become important.The aim of this study is to isolate and characterize novel bioactive peptides from skim and/or whole cow’s milk fermented with selected lactobacillus strains. Several homo/heterofermentative strains of the Lactobacillus species of dairy origin have been pre-selected and different milk fermented samples have been studied. A protocol for analyses was designed and the milk proteins were separated by centrifugation at 4°C at 10000 × g, with molecular mass cut off (MWCO) membranes of 3 and 10 kDa. The samples with molecular mass below 3 kDa were further separated by ultrafiltration by dialysis cell (cut off membrane 1 kDa) by continuous stirring at room temperature. The milk fractions under 1 kDa molecular mass were characterized by UPLC-MS. The ACE-inhibitory activity was determined using the FAPGG (N-[3-(2-Furyl) acryloyl]-L-phenylalanyl-glycyl-glycine) degradation method. All tested samples (1 kDa) exhibit ACE I inhibitory activity with IC50 in a range of 6 - 37 mg mL-1. In silico logP prediction of selected peptides was used to assess whether lipophilicity of the compounds falls within the so-called “therapeutically relevant pharmacokinetic space”.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":" 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141673736","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

5-FLUOROURACIL ENCAPSULATED CHITOSAN MICROSPHERES 5-氟尿嘧啶包裹壳聚糖微球

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.19

S. Milenkova, Svetoslav Tashkov, N. Zahariev, B. Pilicheva, M. Marudova

引用次数: 0

ТHE EFFECT OF GRAPE SEED AND SKIN EXTRACTS ON OXIDATIVE AND COLOR STABILITY OF MINCED PORK MEAT 葡萄籽和葡萄皮提取物对碎肉氧化稳定性和色泽稳定性的影响

Journal of Chemical Technology and Metallurgy Pub Date : 2024-07-05 DOI: 10.59957/jctm.v59.i4.2024.6

Yavor Ivanov, T. Godjevargova

{"title":"ТHE EFFECT OF GRAPE SEED AND SKIN EXTRACTS ON OXIDATIVE AND COLOR STABILITY OF MINCED PORK MEAT","authors":"Yavor Ivanov, T. Godjevargova","doi":"10.59957/jctm.v59.i4.2024.6","DOIUrl":"https://doi.org/10.59957/jctm.v59.i4.2024.6","url":null,"abstract":"The aim of this study was to determine and compare the antilipid potential of seed (GSE) and skin extracts (SE) of Pinot Noir red grape. The preparation of extracts and the evaluation of their color were performed. The antilipid potential of GSE and SE was investigated in the minced pork meat samples. Four experimental samples were prepared: with grape seed and skin extracts, with synthetic antioxidant and without additives. The samples were stored at 4oC for 10 days. During this period product color and formed thiobarbituric acid-reactive substances were determined. It was found that the GSE at concentration 1000 μg g-1 limited the oxidative processes more effectively (55.32 %) than the SE (34.04 %) with the same concentration. These results were correlated very well with the TPC and the phenolic composition of the two extracts. The obtained results with GSE (500 and 1000 μg g-1) were like those obtained with the synthetic antioxidant (200 μg g-1). The effect of added GSE and SE onto the minced meat color change during its storage was determined. The results are optimistic because they indicate that grape seed extract can be used as a natural antioxidant in the meat products.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":" 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141674859","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