Resource-Efficient Technologies最新文献_第8页

Green synthesis of silver nanoparticles using Lippia nodiflora aerial extract and evaluation of their antioxidant, antibacterial and cytotoxic effects 绿色合成纳米银及其抗氧化、抗菌和细胞毒作用的评价

Resource-Efficient Technologies Pub Date : 2017-12-01 Epub Date: 2017-08-14 DOI: 10.1016/j.reffit.2017.07.002

Arumugam Sudha , Jeyaraman Jeyakanthan , Pappu Srinivasan

{"title":"Green synthesis of silver nanoparticles using Lippia nodiflora aerial extract and evaluation of their antioxidant, antibacterial and cytotoxic effects","authors":"Arumugam Sudha , Jeyaraman Jeyakanthan , Pappu Srinivasan","doi":"10.1016/j.reffit.2017.07.002","DOIUrl":"10.1016/j.reffit.2017.07.002","url":null,"abstract":"<div><p>Silver nanoparticles biosynthesis has received increasing attention in the field of nanotechnology due to their antimicrobial and biomedical applications. Green synthesis of metal nanoparticles is anticipated as a cost effective and eco-friendly alternative in the current research scenario. With this aim, the aqueous extracts made from the aerial parts of <em>Lippia nodiflora</em> were used as the reducing agents to synthesize silver nanoparticles (AgNPs) and their antioxidant, antibacterial and cytotoxic properties have also been evaluated. The biosynthesized AgNPs were characterized by UV–Visible Spectroscopy, Fourier-Transform Infrared Spectroscopy (FTIR) and X-Ray Diffraction (XRD) analysis. The AgNPs were found to be stable at −25.2 mV through zeta potential study. The morphology and size of synthesized silver nanoparticles were confirmed by Scanning Electron Microscope with energy dispersive spectra (SEM-EDX) and Transmission Electron Microscopy (TEM) analysis with size range from 30 to 60 nm. Biosynthesized AgNPs exhibited strong antioxidant activity as well as showed potent antibacterial activity against human pathogenic bacteria. The cytotoxicity study of AgNPs was also revealed against MCF-7 breast cancer cell lines in a dose-dependent manner. The recognized bioactivity confirmed by the synthesized AgNPs directs towards the clinical use as an antioxidant, antibacterial and cytotoxic agent.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 4","pages":"Pages 506-515"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75226580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 140

Development of advanced winding condition control technology of electric motors based on pulsed method 基于脉冲方法的先进电机绕组状态控制技术的开发

Resource-Efficient Technologies Pub Date : 2017-09-01 DOI: 10.1016/j.reffit.2017.08.001

Alexey V. Mytnikov, Valeriy A. Lavrinovich, Arina M. Evseeva, Ivan A. Stepanov

{"title":"Development of advanced winding condition control technology of electric motors based on pulsed method","authors":"Alexey V. Mytnikov, Valeriy A. Lavrinovich, Arina M. Evseeva, Ivan A. Stepanov","doi":"10.1016/j.reffit.2017.08.001","DOIUrl":"10.1016/j.reffit.2017.08.001","url":null,"abstract":"<div><p>More than 80 percent of all electrical energy customers are electric motors. Therefore one of the prospects of resource-effective technologies in power industry is control of rotating electric equipment condition. Winding defects are one of the main causes of electric motor failures. Reliable control of winding condition is an urgent task of modern electrical engineering technology. The present article is devoted to the research of pulsed method application of transformer winding control for electric motor winding condition control. The procedure of winding condition control technology is described. The proposed method is based on the known pulsed method. The essential difference between the two methods is that only one probing impulse is used which is a probing impulse and response signal at once. The results of diagnostic procedure research at different winding defects are given. It is established that the place of winding damage corresponds to characteristic impulse changes. The defect of definite types causes specific changes of the probing impulse form. Therefore, different winding defects could be found with high accuracy along winding.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 3","pages":"Pages 232-235"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.08.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79000057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Renewable energy resources in South Asian countries: Challenges, policy and recommendations 南亚国家的可再生能源:挑战、政策和建议

Resource-Efficient Technologies Pub Date : 2017-09-01 Epub Date: 2017-01-13 DOI: 10.1016/j.reffit.2016.12.003

Akash Kumar Shukla, K. Sudhakar, Prashant Baredar

{"title":"Renewable energy resources in South Asian countries: Challenges, policy and recommendations","authors":"Akash Kumar Shukla, K. Sudhakar, Prashant Baredar","doi":"10.1016/j.reffit.2016.12.003","DOIUrl":"10.1016/j.reffit.2016.12.003","url":null,"abstract":"<div><p>In South Asia, a number of developing countries like India, Pakistan, Sri Lanka, Bhutan, Nepal, Afghanistan and Maldives are looking into inexhaustible and repeatable alternative energy sources such as solar, wind, hydro and biomass. Geographically, South Asian countries are located in a region of different climatic conditions such as tropical, humid etc. which provides easy access to a variety of renewable energy sources. The governments of South Asian countries have initiated renewable energy policies to encourage industries and individuals to employ renewable energy powered systems in power applications. This article provides an updated and comprehensive overview of the renewable energy status in the South Asian countries, and it includes an assessment of the region's renewable potential, current installed renewable energy capacity. This paper gives a brief description about energy scenario, renewable energy potential and challenges in South Asian countries. The study also provides the renewable energy policies and recommendation in South Asian countries.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 3","pages":"Pages 342-346"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2016.12.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86131708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 117

Sustainable chemistry and chemical processes for a sustainable future 可持续的化学和化学过程为可持续的未来

Resource-Efficient Technologies Pub Date : 2017-09-01 Epub Date: 2017-09-05 DOI: 10.1016/j.reffit.2017.08.006

Veera Gnaneswar Gude

引用次数: 5

Optimization of adsorptive removal of α-toluic acid by CaO2 nanoparticles using response surface methodology 响应面法优化氧化钙纳米颗粒吸附去除α-甲酸的工艺

Resource-Efficient Technologies Pub Date : 2017-09-01 Epub Date: 2017-04-18 DOI: 10.1016/j.reffit.2017.03.004

Sapana S. Madan, Kailas L. Wasewar, C. Ravi Kumar

{"title":"Optimization of adsorptive removal of α-toluic acid by CaO2 nanoparticles using response surface methodology","authors":"Sapana S. Madan, Kailas L. Wasewar, C. Ravi Kumar","doi":"10.1016/j.reffit.2017.03.004","DOIUrl":"10.1016/j.reffit.2017.03.004","url":null,"abstract":"<div><p>The present work addresses the optimization of process parameters for adsorptive removal of α-toluic acid by calcium peroxide (CaO<sub>2</sub>) nanoparticles using response surface methodology (RSM). CaO<sub>2</sub> nanoparticles were synthesized by chemical precipitation method and confirmed by Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) analysis which shows the CaO<sub>2</sub> nanoparticles size range of 5–15 nm. A series of batch adsorption experiments were performed using CaO<sub>2</sub> nanoparticles to remove α-toluic acid from the aqueous solution. Further, an experimental based central composite design (CCD) was developed to study the interactive effect of CaO<sub>2</sub> adsorbent dosage, initial concentration of α-toluic acid, and contact time on α-toluic acid removal efficiency (response) and optimization of the process. Analysis of variance (ANOVA) was performed to determine the significance of the individual and the interactive effects of variables on the response. The model predicted response showed a good agreement with the experimental response, and the coefficient of determination, (<em>R</em><sup>2</sup>) was 0.92. Among the variables, the interactive effect of adsorbent dosage and the initial α-toluic acid concentration was found to have more influence on the response than the contact time. Numerical optimization of process by RSM showed the optimal adsorbent dosage, initial concentration of α-toluic acid, and contact time as 0.03 g, 7.06 g/L, and 34 min respectively. The predicted removal efficiency was 99.50%. The experiments performed under these conditions showed α-toluic acid removal efficiency up to 98.05%, which confirmed the adequacy of the model prediction.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 3","pages":"Pages 329-336"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.03.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75967806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Bio-augmentation of antioxidants and phenolic content of Lablab purpureus by solid state fermentation with GRAS filamentous fungi GRAS丝状真菌固态发酵对紫菜抗氧化剂和酚类含量的生物增强作用

Resource-Efficient Technologies Pub Date : 2017-09-01 Epub Date: 2017-01-13 DOI: 10.1016/j.reffit.2016.12.007

Pardeep Kumar Sadh, Pooja Saharan, Joginder Singh Duhan

{"title":"Bio-augmentation of antioxidants and phenolic content of Lablab purpureus by solid state fermentation with GRAS filamentous fungi","authors":"Pardeep Kumar Sadh, Pooja Saharan, Joginder Singh Duhan","doi":"10.1016/j.reffit.2016.12.007","DOIUrl":"10.1016/j.reffit.2016.12.007","url":null,"abstract":"<div><p>The present study was conducted to find out the effect of solid state fermentation on release of phenolics and subsequently on improvement of antioxidant activity of fermented seed and flour of <em>Lablab purpureus</em> (seim), using GRAS filamentous fungi i.e. <em>Aspergillus awamori</em> and <em>Aspergillus oryzae</em>. Significant increase in TPC level was observed on 5th day of fermentation of seed and flour with <em>A. awamori</em> and <em>A. oryzae</em> as compared to non-fermented ones. In DPPH and ABTS antioxidant assay, maximum activity was noticed in fermented ethanolic extract of seim seed with <em>A. awamori</em> and <em>A. oryzae</em> on 3rd and 4th day of incubation, respectively. The findings showed higher antioxidant activity formation in fermented seim seed than flour. Significant increase in enzyme activity of α-amylase was also contributed by SSF. This study demonstrated that fermented seed and flour of seim are better source of phytochemicals compared to the non-fermented ones.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 3","pages":"Pages 285-292"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2016.12.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90429153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Sorption characteristics of economically viable silicate sorbents for sequestration of lead ions from aqueous solutions 经济可行的硅酸盐吸附剂对水溶液中铅离子的吸附特性

Resource-Efficient Technologies Pub Date : 2017-09-01 Epub Date: 2017-06-07 DOI: 10.1016/j.reffit.2017.05.002

S.B. Yarusova , P.S. Gordienko , Ramya Krishna , Yu.A. Azarova , A.P. Suponina , A.V. Perfilev , Yogesh Chandra Sharma

引用次数: 3

Development of a green procedure of citrus fruits waste processing to recover carotenoids 柑橘类水果废弃物绿色处理回收类胡萝卜素工艺的研究

Resource-Efficient Technologies Pub Date : 2017-09-01 DOI: 10.1016/j.reffit.2017.08.007

Meryem Boukroufa , Chahrazed Boutekedjiret , Farid Chemat

{"title":"Development of a green procedure of citrus fruits waste processing to recover carotenoids","authors":"Meryem Boukroufa , Chahrazed Boutekedjiret , Farid Chemat","doi":"10.1016/j.reffit.2017.08.007","DOIUrl":"10.1016/j.reffit.2017.08.007","url":null,"abstract":"<div><p>In this study, an original and green procedure of processing waste of the citrus fruits was developed using the concept of bio-refinery, innovative techniques “ultrasound” and “micro-wave”, and a green solvent “limonene” to recover carotenoids. Essential oil extraction was performed by Solvent Free Microwave Extraction (SFME) and compared to steam distillation (SD). The essential oil yields were comparable for both processes: 4.02 ± 0.23% for SFME and 4.16 ± 0.05% for SD. After that, carotenoid extraction from citrus peels was performed by ultrasound-assisted extraction (UAE) and conventional extraction (CE) using <span>d</span>-limonene obtained starting from essential oil, as a solvent, and then compared to n-hexane extract. Response surface methodology (RSM) using central composite designs (CCD) approach was launched to investigate the influence of process variables on the ultrasound-assisted extraction (UAE). The statistical analysis revealed that the optimized conditions of ultrasound power, temperature and time were 208 W cm<sup>−2</sup>, 20 °C and 5 min giving carotenoid content of 11.25 mg L<sup>−1</sup>. Compared to the conventional extraction, (UAE) gave an increase of 40% in carotenoid content. The comparison to n-hexane extract gave no significant changes in carotenoid content. Combination of microwave, ultrasound and <span>d</span>-limonene obtained from a bio-refinery of a by-product of citrus fruits industry allow us to develop a very good environmental green approach giving high added values compounds, with a saving of time, and a complete valorisation of waste.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 3","pages":"Pages 252-262"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.08.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79269195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 42

Comparison of BIPV and BIPVT: A review BIPV与BIPVT的比较综述

Resource-Efficient Technologies Pub Date : 2017-09-01 Epub Date: 2016-12-20 DOI: 10.1016/j.reffit.2016.11.013

Mary Debbarma, K. Sudhakar, Prashant Baredar

引用次数: 110

Optimization of extraction condition for phytic acid from peanut meal by response surface methodology 响应面法优化花生粕中植酸的提取条件

Resource-Efficient Technologies Pub Date : 2017-09-01 Epub Date: 2017-07-12 DOI: 10.1016/j.reffit.2017.06.002

Hong Ren, Ting Li, Huijie Wan

{"title":"Optimization of extraction condition for phytic acid from peanut meal by response surface methodology","authors":"Hong Ren, Ting Li, Huijie Wan","doi":"10.1016/j.reffit.2017.06.002","DOIUrl":"10.1016/j.reffit.2017.06.002","url":null,"abstract":"<div><p>Phytic acid (PA), a molecule with high commercial value, is one of the important component in peanut meal. However, PA has not yet been isolated from peanut meal and played its role. This paper reported the extraction conditions of PA from peanut meal after removed protein. The independent variables were hydrochloric acid (HCl) concentration, solid to liquid ratio, extraction time and extraction temperature. Response surface methodology (RSM) was used to optimize the extraction conditions based on the extraction yield of PA. The results show that the second-order polynomial models derived from responses well with the experimental (R<sup>2</sup> = 0.9783). The optimal extraction condition was obtained with solid to liquid ratio of 1:16 (g:mL), HCl concentration of 0.02mol/L, extraction time of 105min, and extraction temperature of 30<span></span>°C. At this condition, PA with higher purity were obtained. the extraction ratio was 6.12%, and the content of PA was 182.7mg/g dry PA extract. The experimental values under optimal condition were in good consistent with the predicted values. The PA extracted from peanut meal was verified qualitatively by IR spectra. The extraction technology of PA from peanut meal has a strong potential for realized high-value utilization of peanut meal.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 3","pages":"Pages 226-231"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.06.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90501214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20