Acta Periodica Technologica最新文献

{"title":"Influence of physicochemical parameters of the alkaline pretreatment on the viscosity of wheat straw slurries","authors":"V. Sydorenko, O. Obodovych, Tetyana Grabova, Olena Podobii","doi":"10.2298/apt2152253s","DOIUrl":"https://doi.org/10.2298/apt2152253s","url":null,"abstract":"The paper presents the results of the influence of physicochemical parameters of the alkaline pretreatment on the viscosity of wheat straw slurries on its rheological properties. The authors consider the coefficient of apparent viscosity as a complex indicator of wheat straw slurries pretreatment process which depends on the structure and physicochemical properties of system components, thermal parameters of the process (temperature, dispersion, and concentration of dispersed phase, shear flow rate). A wheat straw slurries with a solids content of 10?15% were chosen as the object of research. As a result of research, rheological viscosity and fluidity were constructed for these slurries in the range of shear rates from 1 to 437.4 s-1. The value of viscosity as a function of shear rate for a solids concentration of 10, 12, and 15% w. is given. It has been determined that in a certain range of shear rates the slurries show the behavior of viscoelastic fluids with yield stress, and with increasing of the solids concentration the rate of decrease of viscosity increases with increasing shear rate. A study of the effect of alkali concentration on apparent viscosity was performed. It is determined that an increase in the concentration of alkali leads to an increase in the apparent viscosity of the slurry, and with increasing alkali concentration, the rate of decrease in viscosity decreases with increasing shear rate. The value of the apparent viscosity of the suspension as a function of temperature is given.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411859","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}

{"title":"Essential oil and ethanolic extract composition from Myrtus nivellei Batt. & Trab. and their biological evaluations","authors":"Farah Ramdane, Oualid Medjour, A. Ben, Soumia Hadjadj, Messouda Guemouda, Mounira Kadri, Mahammed Hadj","doi":"10.2298/apt2152111r","DOIUrl":"https://doi.org/10.2298/apt2152111r","url":null,"abstract":"This study aims to evaluate the chemical composition and biological effects of an endemic Algerian species Myrtus nivellei belonging to the Myrtaceae family. The aerial parts of the plant were submitted to hydrodistillation and analysed with gas chromatography - mass spectrometry (GC-MS). This oil was yielded 0,75% (w/w). The GC-MS revealed that 1,8 cineole is the most abundant component (53,44%) while other compounds were present in high contents: 2,2,6,7-tetramethyl-10-oxatricyclo [4.3.0.1(1,7)]- decan-5-one (11,73%), trans ocimene (7,54%), linalyl propirionate (6,81%) and lavandulyl acetate (5,24%). In addition ethanolic extract of studied plant was prepared. Total phenol, tannin, flavonoid, and condensed tannin?s contents were determined using Folin-Ciocalteu, aluminum chloride and vanillin colorimetric methods, respectively. Three tests were used for the investigation of antioxidant activity of both extract and oil. Strong antioxidant activity was shown mainly by crude extract. Antibacterial screening was evaluated against Gram positive and Gram negative bacteria. Ethanolic extract and oil were active especially against Staphylococcus aureus.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411955","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}

{"title":"Antimicrobial activities of different agents including pyrophyllite against foodborne pathogens: A brief review","authors":"A. Bočarov-Stančić, J. Krulj, M. Maslovarić, M. Bodroža‐Solarov, Rade Jovanović, R. Beskorovajni, M. Adamović","doi":"10.2298/apt2152189b","DOIUrl":"https://doi.org/10.2298/apt2152189b","url":null,"abstract":"There has been worldwide an increasing interest and more strict criteria for food/feed safety including absence or reduction of the total number of microorganisms (bacteria, moulds and yeasts). Besides heavy metals, materials of biological origin (plant extracts, bio waste, chitosan etc.), some mineral adsorbents also have antimicrobial properties. There is much information about the antibacterial activity of the modified bentonite, montmoriollonite, smectute, zeolites and antifungal activity of various metal ion-exchanged zeolites and natural mineral clay, but there is almost no information about the antimicrobial properties of pyrophyllite, a monoclinic mineral from the group of phyllosilicates. This work summarizes the recent developments of antimicrobial agents and their application, current research, and trends in the area, highlighting pyrophyllite and its potential applications. Pyrophyllite, an unexploited mineral, possesses antimicrobial properties such as antibacterial and antifungal activities against foodborne pathogens which contributes to the protection of consumer?s health and preservation of the environment. Results from preliminary investigations indicate that pyrophyllite showed antibacterial properties against Escherichia coli, Staphylococcus aureus, Enterococcus faecalis, and antifungal properties against fungal pathogens (Fusarium oxysporum, Phoma glomerata and Rhizoctonia solani). This mineral can also be used for biological control of F. oxysporum in the soil for growing potato.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68412066","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}

{"title":"Degradation of an organophosphorus insecticide in aqueous medium by Electro-Fenton process","authors":"M. Assassi, F. Madjene, A. Amrane","doi":"10.2298/apt2152063a","DOIUrl":"https://doi.org/10.2298/apt2152063a","url":null,"abstract":"This work proposes the remediation of toxic and/or refractory pollutants, such as the organophosphorus insecticide (Phosmet) which cannot be completely degraded by conventional methods like biological treatment, adsorption, flocculation, electro-flocculation, reverse osmosis, ultrafiltration, coagulation. However, these techniques have some disadvantages such as incomplete removal, therefore, the Electro-Fenton process was used. The major factors affecting the removal of Phosmet, namely the current intensity, catalyst concentration (Fe3+), temperature solution, nature of the electrolytes and oxygenation duration of the solution were studied in this work. The optimal operating conditions appeared to be: current intensity 200 mA, 0.5 mmol L-1 of Fe3+, T= 20?C, pH =3 using Na2SO4 (50 mmol L-1) as supporting electrolyte and an oxygen supply throughout all the experiments (120 min). Under these optimal conditions, the removal efficiency of the phosmet was 88%.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411873","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}

{"title":"Food safety knowledge among cadets of Military Academy in Republic of Serbia","authors":"N. Smigic, Sladjana Jovanovic, I. Djekic, Srboljub Nikolić","doi":"10.2298/apt2152159s","DOIUrl":"https://doi.org/10.2298/apt2152159s","url":null,"abstract":"The purpose of this study was to evaluate the level of food safety knowledge among cadets of Military Academy in the Republic of Serbia. For that purpose, a structured, self-administrative questionnaire was designed and used to assess the level of food handling practices and food safety knowledge. In total, 120 cadets were involved in the study. For each participating cadet, the food handling practice score (FHPS) and food safety knowledge score (FSKS) was calculated by dividing the sum of correct answers by the total number of correct responses. Additionally, knowledge gaps were identified for each question. Our results indicated that on the average FHPS among Serbian cadets was 44.5%, while FSKS was 50.5%. Female cadets showed better scores compared to males, although this was not statistically significant. Better FHPS scores were determined among cadets living with parents (48.7%), compared to cadets living with roommates (43.6%, p?0.05), while an opposite was determined for FSKS. In total, 95.8% of cadets apply good practice of hand hygiene before preparing food, 90.8% of them knew that is not safe to consume food when the shelf-life is expired, and 89.2% knew that the opened sterilized milk should not be stored outside the refrigerator. Also, 91.7% of cadets knew that content of blown can is not safe for the consumption. Almost 64.2% of all cadets could successfully make association between meat and Trichinella, while merely 27.5% of them knew that Escherichia coli O157 is the most important pathogen for raw minced meat, and only 13.3% of cadets knew that Listeria monocytogenes is associated with ready-to-eat meat products. Finally, only 10% of cadets knew that Campylobacter is food-borne pathogen mostly associated with raw and undercooked chicken meat. Also, our cadets were not aware that color, smell or appearance of food would not give any indication of food contamination, as only 6.7% of cadets knew this. Results obtained in this study pointed out some food safety areas which need further improvement via educational program, but also via media and internet courses, material or short clips.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68412024","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}

{"title":"Removal of methylene blue by biosorption onto Stipa tenacissima L. (Alfa) plants: Kinetics, equilibrium and thermodynamic studies","authors":"Samir Ladjali, Nadjib Dahdouh, S. Amokrane, Elhadj Mekatel, D. Nibou","doi":"10.2298/apt2152033l","DOIUrl":"https://doi.org/10.2298/apt2152033l","url":null,"abstract":"This study examines the ability of Stipa tenacissima L. (Alfa) to biosorb the Methylene Blue dye. Biosorption tests were performed in aqueous solution based on certain essential parameters such as solution?s pH (2-12), solid/liquid ratio (1-6 g/L), initial dye concentration (25-125 mg/L) and contact time (0-300 min). The Langmuir, Freundlich, Temkin and Elovich models were applied. It was found that the equilibrium data could be fitted to the Langmuir isotherm for MB biosorption with a maximum capacity qmax 55, 95 mg/g. The kinetic study shows that the experimental data correspond to the pseudo-second order kinetic model. The negative Gibbs values free energy ?G? reveal the spontaneity of MB biosorption at the surface of Stipa tenacissima L. The positive value of ?H? reveals the endothermic nature of the process.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411244","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}

{"title":"Fémalkatrészek additív és szubtraktív módon történő gyártásának összehasonlítása","authors":"Bálint Leon Seregi, Péter Ficzere, Lajos Borbás","doi":"10.47273/AP.2021.22.18-32","DOIUrl":"https://doi.org/10.47273/AP.2021.22.18-32","url":null,"abstract":"A bemutatott elméleti összehasonlítás célja az additív és szubtraktív módon előállított fémalkatrészek különböző tulajdonságainak összevetése, mint felületi érdesség, gyárthatóság vagy gyártási idő szempontjából. A vizsgálatot a két gyártási mód jellegzetességéből adódó tulajdonságok felhasználásával végezzük. Az összehasonlítás célja, hogy egy legyártani kívánt alkatrészről el tudjuk dönteni melyik gyártástechnológiával érdemesebb létrehozni, ha az általunk kiválasztott paramétert részesítjük előnyben (gyártási sebesség, felületi minőség).","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78896386","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}

{"title":"Megújuló energiaforrások háztartási méretű alkalmazásának kutatásai és gyakorlati tapasztalatai","authors":"Zsófia Molnárné Dőry, István Dőry","doi":"10.47273/AP.2021.22.4-17","DOIUrl":"https://doi.org/10.47273/AP.2021.22.4-17","url":null,"abstract":"Megújuló energiaforrások háztartási méretű alkalmazásának kutatási és gyakorlati tapasztalatait mutatja be a cikk. A tatabányai bemutató Passzívház, az autonóm Referenciaház, és az egyetemen készült napjármű esetein ismertetjük a megújuló technológiák alkalmazásának elvi hátterét, fenntarthatóság elérésében betöltött szerepüket, a gyakorlatban igazolt üzemmódjait. Röviden bemutatásra kerülnek a helyben termelt és hasznosított energiafajták, a kisebb méretű, együttműködő alrendszerek, az időzítés, a szezonalitás, a napi ingadozás kérdése és megvalósításuk eredményei.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73443238","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}

{"title":"FDM 3D nyomtatók extruderének befolyása a kész termék mechanikai tulajdonságaira","authors":"Péter Ficzere, Lajos Borbás, N. Lukács","doi":"10.47273/ap.2021.23.46-52","DOIUrl":"https://doi.org/10.47273/ap.2021.23.46-52","url":null,"abstract":"A bemutatott jelenséget egy mérésre készülő próbatestsorozat gyártása közben észleltük, melynél a mérés eredeti célja az FDM technológiával gyártott alkatrészek mechanikai tulajdonságainak javítása a lehető legegyszerűbb módon.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88947617","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}

{"title":"Fotóalapú 3D modellalkotás","authors":"Álmos Kristály, Péter Ficzere, Lajos Borbás","doi":"10.47273/ap.2021.23.53-64","DOIUrl":"https://doi.org/10.47273/ap.2021.23.53-64","url":null,"abstract":"A kísérlet során számítógépes szoftver segítségével állítok elő 3D modelleket fotók alapján. A módszer rendkívül egyszerű és kézenfekvő, főleg nehezen mérhető, bonyolult geometriák esetén. A vizsgálat célja az eljárás pontosságának, gyorsaságának meghatározása, és a potenciális gyakorlati felhasználási módok feltérképezése.","PeriodicalId":7021,"journal":{"name":"Acta Periodica Technologica","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75659562","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}