Advanced Science, Engineering and Medicine最新文献_第10页

Spinel-Type Cobalt Oxide Nanoparticles: Synthesis, Characterization and Antibacterial Properties 尖晶石型氧化钴纳米颗粒:合成、表征及抗菌性能

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2623

S. Ambika, S. Gopinath, K. Sivakumar, K. Saravanan

{"title":"Spinel-Type Cobalt Oxide Nanoparticles: Synthesis, Characterization and Antibacterial Properties","authors":"S. Ambika, S. Gopinath, K. Sivakumar, K. Saravanan","doi":"10.1166/asem.2020.2623","DOIUrl":"https://doi.org/10.1166/asem.2020.2623","url":null,"abstract":"A series of cobalt oxide nanoparticles (sample A (300 °C), sample B (400 °C) and sample C (500 °C)) are synthesized in a starch medium by the hydrothermal method followed by annealing. The structural, morphological, and magnetic, of these cobalt oxide nanoparticles, become\u0000 characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) correspondingly. Furthermore, it can be seen that the increase in the synthesis temperature results in a substantial increase in the average\u0000 particle size. The impact of synthesis temperature in relation to morphology (size and shape) and magnetic properties of cobalt oxide nanoparticles has been investigated. Besides, the antibacterial and catalytic activity of these nanoparticles are examined. A systematic analysis is presented\u0000 on the influence of parameters of synthesis on the formation and structural properties of cobalt oxide nanoparticles. We expect in which this topic will give many valuable ideas for the metal oxide nanomaterials development, synthesis, as well as applications.","PeriodicalId":7213,"journal":{"name":"Advanced Science, Engineering and Medicine","volume":"463 1","pages":"859-863"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87895707","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

Experimental and Theoretical Nuclear Magnetic Resonance Data from Tryptanthrin, an Alkaloid with Potential Activity Against Human Coronavirus 具有抗人冠状病毒活性生物碱色胺菊酯的核磁共振实验与理论研究

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2638

F. L. Costa, S. B. O. Fernandes, C. E. Fingolo, F. Boylan, A. M. J. C. Neto, G. S. Mota, B. A. Soares, M. Siqueira, Thaís Forest Giacomello

{"title":"Experimental and Theoretical Nuclear Magnetic Resonance Data from Tryptanthrin, an Alkaloid with Potential Activity Against Human Coronavirus","authors":"F. L. Costa, S. B. O. Fernandes, C. E. Fingolo, F. Boylan, A. M. J. C. Neto, G. S. Mota, B. A. Soares, M. Siqueira, Thaís Forest Giacomello","doi":"10.1166/asem.2020.2638","DOIUrl":"https://doi.org/10.1166/asem.2020.2638","url":null,"abstract":"Coronaviruses belong to the subfamily Coronavirinae, which are large viruses with a single Ribonucleic acid tape and a nucleocapsid. In a recent study it was found that the molecule of tryptanthrin has antiviral potential against human coronavirus NL63. In this work, we used\u0000 a combination of theoretical techniques with experimental nuclear magnetic resonance data to assist in the structural characterization of the Tryptanthrin molecule. Tryptanthrin was extracted from Couroupita guianensis leaves. The theoretical calculations of hydrogen-1, homonuclear\u0000 spin–spin coupling constants and the quantum theory of atoms in molecules were performed employing density functional theory. Our results show that the hydrogen-1 chemical shifts calculated at the gaseous phase and solvent presented similar performance. The quantum theory of atoms in\u0000 molecules calculations was able to quantify and qualify bonded interactions based on five topological parameters obtained at the analyzed bond critical point to tryptanthrin molecule. We obtained a satisfactory correlation between tryptanthrin delocalization index values and its experimental\u0000 and calculated proton–proton coupling constants. In conclusion, the theoretical techniques used in this work in combination with NMR experimental data can be a useful tool in aiding the structural determination of organic compounds.","PeriodicalId":7213,"journal":{"name":"Advanced Science, Engineering and Medicine","volume":"45 1","pages":"963-969"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81021996","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

Effect of Laser Energy on Optical and Morphological Properties of Gold Nanoparticles 激光能量对金纳米粒子光学和形态性质的影响

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2662

K. A. Mohammed, Azhar A. Habieb, Ahmed O. Swary, Dalal N. Ahilfi, D. K. Thbayh

引用次数: 0

Antibacterial Properties of Oregano Essential Oil Encapsulated in Poly(ε-Caprolactone) Nanoparticles 聚ε-己内酯纳米颗粒包封牛至精油的抗菌性能

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2626

J. R. Souza, K. Bonfim, M. V. Lorevice, D. Correa, L. Mattoso, M. R. Moura

{"title":"Antibacterial Properties of Oregano Essential Oil Encapsulated in Poly(ε-Caprolactone) Nanoparticles","authors":"J. R. Souza, K. Bonfim, M. V. Lorevice, D. Correa, L. Mattoso, M. R. Moura","doi":"10.1166/asem.2020.2626","DOIUrl":"https://doi.org/10.1166/asem.2020.2626","url":null,"abstract":"This work describes an outstanding synthesis of poly(ε-caprolactone) nanoparticles of distinct sizes loaded (PCLNP/OEO) or not (PCLNP) with oregano (Origanum vulgare) essential oil (OEO) by the nanoprecipitation method in order investigate the antimicrobial properties against\u0000 bacteria Escherichia coli and Staphylococcus aureus. OEO antimicrobial activity was achieved by minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). FTIR spectra indicated that encapsulation of OEO by PCLNPs was successful. Scanning electron microscopy\u0000 images revealed that PCLNP and PCLNP/OEO presented spherical shape with diameters around 150 nm, while PCLNP exhibited size distribution raging 158 to 300 nm and zeta potential ranging from -13.8 to -28.5 mV. Thermogravimetric analysis indicated an increase in initial temperature of weight\u0000 loss for PCLNP/OEO. PCLNP with 80% wt. of OEO has exhibited the highest decrease of growth of bacteria, and MIC against S. aureus and E. coli and MBC only for E. coli, which indicate a promising alternative for designing stable antimicrobial nanoparticles for application\u0000 in novel food active packaging.","PeriodicalId":7213,"journal":{"name":"Advanced Science, Engineering and Medicine","volume":"8 1","pages":"864-869"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87083467","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: 1

A Comparative Study on Inverse Vibration Based Damage Assessment Techniques in Beam Structure Using Ant Colony Optimization and Particle Swarm Optimization 基于蚁群优化和粒子群优化的梁结构反振动损伤评估技术对比研究

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2649

Aditi Majumdar, Bharadwaj Nanda

{"title":"A Comparative Study on Inverse Vibration Based Damage Assessment Techniques in Beam Structure Using Ant Colony Optimization and Particle Swarm Optimization","authors":"Aditi Majumdar, Bharadwaj Nanda","doi":"10.1166/asem.2020.2649","DOIUrl":"https://doi.org/10.1166/asem.2020.2649","url":null,"abstract":"Use of swarm intelligence has proliferated over previous couple of years for damage assessment in large and complex structures using vibration data. Available literatures shows ‘ant colony optimization’ (ACO) and ‘particle swarm optimization’ (PSO) are predominantly\u0000 used for solving complex engineering problems including damage identification and quantification problems. The time requirement and accuracy of the vibration based damage identification algorithms depends on early exploration and late exploitation capabilities of soft computing techniques.\u0000 However, there are not any literature available comparing algorithms on these bases. In the current study, an inverse problem is constructed using the natural frequency changes which is then solved using ACO and PSO algorithms. The algorithm is run for identification of single and multiple\u0000 damages in simple support and cantilever beam structures. It's found that, both ACO and PSO based algorithms are capable of detecting and quantifying the damage accurately within the limited number of iterations. However, ACO based algorithm by virtue of its good exploration capability is\u0000 able to identify near optimal region faster than PSO based algorithm, whereas PSO algorithm has good exploitation capability and hence able to provide better damage quantification than ACO algorithm at latter stages of iteration. Further, PSO based algorithm takes less time to reach at required\u0000 accuracy level. It is also observed that, the time required for these algorithms are independent of numbers of damage and support conditions.","PeriodicalId":7213,"journal":{"name":"Advanced Science, Engineering and Medicine","volume":"41 1","pages":"918-923"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90532798","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: 1

Comparison of Process Parameters on Mild Steel and SS304 Through Statistical Analysis of Optimization Technique 通过统计分析优化技术对低碳钢与SS304工艺参数的比较

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2646

Vishal Kumar, M. Hussain, R. Singh, Shashanka P. Kumar

{"title":"Comparison of Process Parameters on Mild Steel and SS304 Through Statistical Analysis of Optimization Technique","authors":"Vishal Kumar, M. Hussain, R. Singh, Shashanka P. Kumar","doi":"10.1166/asem.2020.2646","DOIUrl":"https://doi.org/10.1166/asem.2020.2646","url":null,"abstract":"The present study concentrated on the variation of process parameters on metal removal rate (MRR) used in turning of widely used material (stainless steel 304 and Mild steel). Turning is essential and robust process of material removal in the form of chips. The Turning process involved\u0000 lots of process parameters as tool geometry, feed rate, rotational speed of job and rigidity of machine tools etc. In the present work study was done on the following cutting parameters as cutting speed (85,150 and 250 rpm), feed rate (0.13, 0.28 and 0.15, 0.09 mm/sec), depth of cut (0.4,\u0000 0.7 and 1 mm). The three label orthogonal array for process parameters were selected for metal removal rate analysis. The carbide tipped cutting tool was selected as cutting tool of positive rake angle. The analysis of process parameters was done through Minitab 17 software. The orthogonal\u0000 array was selected 3*3; by the use of signal to noise (S/N) ratio is to minimise the variation due to uncontrolled parameters with the help of Taguchi method. Total nine experiments were performing on stainless steel and other set of nine experiments were perform on the mild steel. The experimental\u0000 results reveals that moderate cutting speed 150 rpm, 0.09 mm/sec feed rate and 1 mm depth of cut yield good results for stainless steel 304 grade and mild steel.","PeriodicalId":7213,"journal":{"name":"Advanced Science, Engineering and Medicine","volume":"1764 1","pages":"888-893"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82848356","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

Ab-Initio Study of Structural and Electronic Properties of ZnxTey (x + y = 2 to 5) Nanoclusters ZnxTey (x + y = 2 ~ 5)纳米团簇结构和电子特性的Ab-Initio研究

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2634

D. Pandey, P. S. Yadav

引用次数: 0

Parametric Optimization of EN-31 Steel in Wire Cut Electro Discharge Machining by Taguchi Technique 田口电火花线切割加工EN-31钢的参数优化

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2645

Sahil Sharma, U. K. Vates, A. Bansal

引用次数: 0

Biosynthesizing Gold Nanoparticles with Parkia biglobosa Leaf Extract for Antibacterial Efficacy In Vitro and Photocatalytic Degradation Activities of Rhodamine B Dye 金叶提取物合成金纳米颗粒体外抗菌及罗丹明B染料光催化降解活性研究

Advanced Science, Engineering and Medicine Pub Date : 2020-07-01 DOI: 10.1166/asem.2020.2661

David Shine, S. Shasha, Alorku Kingdom, Okoampah Emmanuel, S. S. Fometu, Wu Guohua

{"title":"Biosynthesizing Gold Nanoparticles with Parkia biglobosa Leaf Extract for Antibacterial Efficacy In Vitro and Photocatalytic Degradation Activities of Rhodamine B Dye","authors":"David Shine, S. Shasha, Alorku Kingdom, Okoampah Emmanuel, S. S. Fometu, Wu Guohua","doi":"10.1166/asem.2020.2661","DOIUrl":"https://doi.org/10.1166/asem.2020.2661","url":null,"abstract":"The toxicity and cost involved in the synthesis of nanoparticles using physical and chemical methods have led to the emergence of biological techniques being employed by scientists. Hence the present study employed an eco-friendly method by using Parkia biglobosa leaves extract\u0000 as a reducing and stabilizing agent of chloroauric gold (HAuCl4) to gold nanoparticle (AuNPs). Direct Analysis in Real-Time (DART-MS) was employed for phytochemical screening. However, the AuNPs were characterized by Ultraviolet-Visible spectroscopy (UV/Vis), Transmission Electron\u0000 Microscopy (TEM), Energy Dispersive X-ray spectroscopy, Fourier Transmission Infrared Spectroscopy, and X-ray diffraction spectroscopy, before the antibacterial and photocatalysis study. DART-MS showed more than 20 phytochemicals, including phenolic compounds. The FT-IR revealed the existence\u0000 of flavonoids that we hypothesized are responsible for gold chloride reduction reactions. The optical properties of the gold nanoparticles by UV/Vis spectra registered plasmon surface resonance at a peak of 530 nm, whiles TEM revealed the AuNPs to be mono-dispersed and shapes were spherical\u0000 and triangular with sizes ranging from 3.4 nm to 39.7 nm. XRD also recorded face-centered cubic AuNPs with 20.94 nm as the average crystallite size. The synthesized AuNPs were able to elucidate their anti-bacterial efficacy on Gram-positive bacteria Staphylococcus aureus, enterococcus faecalis\u0000 and Gram-negative bacteria Escherichia coli, pseudomonas aeruginosa. The photocatalytic activities of AuNPs under UV/Vis irradiation exhibited a substantial degradation effect on rhodamine b (RhB) within 75 minutes. Due to their non-toxic nature, plant-mediated biosynthesized AuNPs,\u0000 would be valuable in enhancing their biomedical applications and in wastewater treatment.","PeriodicalId":7213,"journal":{"name":"Advanced Science, Engineering and Medicine","volume":"152 1","pages":"970-981"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79585417","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: 1

The Effect of Gravity Modulation on Double Diffusive Convection in the Presence of Applied Magnetic Field and Internal Heat Source 外加磁场和内部热源存在下重力调制对双扩散对流的影响

Advanced Science, Engineering and Medicine Pub Date : 2020-06-01 DOI: 10.1166/asem.2020.2576

P. Kiran, S. Manjula, R. Roslan

引用次数: 3