Resource-Efficient Technologies最新文献_第7页

Characterization and optimization of bacterium isolated from soil samples for the production of siderophores 从土壤样品中分离的产铁载体细菌的特性和优化

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2017.04.004

Venkat Kumar S., Soumya Menon, Happy Agarwal, Divya Gopalakrishnan

{"title":"Characterization and optimization of bacterium isolated from soil samples for the production of siderophores","authors":"Venkat Kumar S., Soumya Menon, Happy Agarwal, Divya Gopalakrishnan","doi":"10.1016/j.reffit.2017.04.004","DOIUrl":"10.1016/j.reffit.2017.04.004","url":null,"abstract":"<div><p>Siderophores are small molecules that can easily bind to ferric iron. As a chelating agent, they transport iron molecules inside the bacterial cell for various biochemical reactions. Due to its various applications in medicinal, industrial and environmental related aspects, this paper deals with characterization and optimization of few siderophores producing bacteria from the soil samples, collected from Chikkamagaluru district, Karnataka. The siderophores production was assayed qualitatively and quantitatively through Chrome Azurol S and the results showed positive for the strains VITVK5 and VITVK6 that grown in succinate medium. Further characterization and optimization results revealed that both the bacterium has the ability to yield siderophores (∼60–80% units) in the optimum condition of pH 8, at 37<span></span>°C with glucose and sucrose as a carbon source and NaNO3 as a nitrogen source. Thus, the study concludes that strains VITVK5 and VITVK6 can be promising candidates for the siderophores production which can play major applications in medicinal and industrial aspects.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 4","pages":"Pages 434-439"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.04.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77393884","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: 56

Performance investigation of vapour recompressed batch distillation for separating ternary wide boiling constituents 蒸汽再压缩间歇精馏分离三元宽沸组分的性能研究

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2017.04.007

Rohith R Nair, Uday Bhaskar Babu G, Amol Raykar

引用次数: 6

A review on biogenic synthesis of gold nanoparticles, characterization, and its applications 纳米金的生物合成、表征及其应用研究进展

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2017.08.002

Soumya Menon, Rajeshkumar S., Venkat Kumar S.

引用次数: 227

Virtual lab based real-time data acquisition, measurement and monitoring platform for solar photovoltaic module 基于虚拟实验室的太阳能光伏组件实时数据采集、测量与监测平台

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2017.04.006

Amit Kumar Rohit, Amit Tomar, Anurag Kumar, Saroj Rangnekar

引用次数: 22

Mathematical modeling of drying behavior of cashew in a solar biomass hybrid dryer 腰果在太阳能生物质混合干燥器中干燥行为的数学建模

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2016.12.002

S. Dhanushkodi , Vincent H. Wilson , K. Sudhakar

引用次数: 64

Optimization studies on extraction of phytocomponents from betel leaves 槟榔叶中植物成分提取工艺的优化研究

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2017.02.007

Muruganandam L, Anantha Krishna, Jashwanth Reddy, G.S. Nirmala

{"title":"Optimization studies on extraction of phytocomponents from betel leaves","authors":"Muruganandam L, Anantha Krishna, Jashwanth Reddy, G.S. Nirmala","doi":"10.1016/j.reffit.2017.02.007","DOIUrl":"10.1016/j.reffit.2017.02.007","url":null,"abstract":"<div><p>The present study aims at finding out the optimum parameters for the extraction of components from Betel leaves possessing medicinal applications using ethanol solvent by Soxhlet apparatus. The optimum conditions for the extract were calculated based on the extract yield by varying four parameters: material quantity (A: 2–4 g), solvent quantity (B: 250–300 ml), mantle temperature (C: 65–75 °C) and extraction time (D: 1–3 hours) and optimized using a four factor three level Box–Behnken response surface design (BBD) coupled with desirability function methodology. Results showed that temperature and extraction time had significant effect on yield of extract. Optimum conditions for highest yield of extract (10.94%) are as follows: material quantity (2 g), solvent quantity (281.4 ml), temperature (72 °C) and time (3 hours). The extract at the maximum yield condition was analyzed for phytocomponents by FTIR and GC–MS. The results indicated the presence of Hydroxy chavicol (69.46%), 4-Chromanol (24%) and Eugenol (4.86%), which possess wide application including as antioxidant, anti-inflammatory, anti-platelet and antithrombotic, antibacterial and antifungal agents.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 4","pages":"Pages 385-393"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.02.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72674695","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: 45

A new fuzzy framework for the optimal placement of phasor measurement units under normal and abnormal conditions 提出了一种新的模糊框架，用于正常和异常情况下相量测量单元的优化配置

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2017.08.005

Ragab A. El-Sehiemy , Shady H.E. Abdel Aleem , Almoataz Y. Abdelaziz , Murat E. Balci

{"title":"A new fuzzy framework for the optimal placement of phasor measurement units under normal and abnormal conditions","authors":"Ragab A. El-Sehiemy , Shady H.E. Abdel Aleem , Almoataz Y. Abdelaziz , Murat E. Balci","doi":"10.1016/j.reffit.2017.08.005","DOIUrl":"10.1016/j.reffit.2017.08.005","url":null,"abstract":"<div><p>This paper presents a new procedure for finding the optimal placement of the phasor measurement units (PMUs) in modern power grids to achieve full network observability under normal operating conditions, and also abnormal operating conditions such as a single line or PMU outage, while considering the availability of PMU measuring channels. The proposed modeling framework is implemented using the fuzzy binary linear programming (FBLP) technique. Linear fuzzy models are proposed for the objective function and constraints alike. The proposed procedure is applied to five benchmark systems such as the IEEE 14-bus, 30-bus, 39-bus, 57-bus, and 118-bus. The numerical results demonstrate that the proposed framework is capable of finding a fine-tuned optimal solution with a simple model and acceptable solution characteristics compared with early works in the literature. Besides, four evaluation indices are introduced to assure the various criteria under study such as the observability depth, measurement redundancy, and robustness of the method under contingencies. The results show that full network observability can be met under normal conditions using 20% PMUs penetration; however, under contingencies, approximately 50% PMUs penetration is required. The novelty of the proposed procedure has proven the capability of the proposed linear fuzzy models to find better optimal number of PMUs with lower number of channels compared to other algorithms under various operating conditions. Hence, the proposed work represents a potential tool to monitor power systems, and it will help the operators in a smart grid environment.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 4","pages":"Pages 542-549"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.08.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74145828","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: 11

An experimental analysis of quenching of continuously heated vertical rod with aqueous Al2O3 nanofluid Al2O3纳米流体连续加热竖杆淬火的实验分析

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2017.02.006

Nirupama Patra , Vivek Gupta , Ravi Singh , R.S. Singh , Pradyumna Ghosh , Arun Nayak

{"title":"An experimental analysis of quenching of continuously heated vertical rod with aqueous Al2O3 nanofluid","authors":"Nirupama Patra , Vivek Gupta , Ravi Singh , R.S. Singh , Pradyumna Ghosh , Arun Nayak","doi":"10.1016/j.reffit.2017.02.006","DOIUrl":"10.1016/j.reffit.2017.02.006","url":null,"abstract":"<div><p>Quenching characteristics of metallic vertical rod with an internal heater has been investigated in pure water and water-based nanofluid with alumina nanoparticles of 0.001% by volume. Initial temperature of the testing rod (12 mm diameter and 1000 mm length) ranges from 200 °C to 250 °C. The internal heater may be used to simulate the decay heat generated by the nuclear fuel rod after the power plant shutdown. Tests have been performed with varied range of experimental conditions of decay heat, constant water and nanofluid flow rates. The cooling curves follow a general trend of a rapid temperature drop up to almost 100 °C of the rod surface temperature irrespective of the operating parameters and the location of the thermocouple. The obtained results during quenching process indicated that HTC (heat transfer coefficient) for nanofluids are more than de-ionized water. It was also observed that in identical circumstances, the quenching time of the specimen in Al<sub>2</sub>O<sub>3</sub> nanofluid considerably decreased as compared to water. The results exhibit that nanofluids can enhance the reflood heat transfer performance in terms of quenching rate for a long vertical rod causing liquid-droplets-induced depositions of nanoparticles resulting in making a pre-coating effect characterized by higher wettability.</p></div>","PeriodicalId":21019,"journal":{"name":"Resource-Efficient Technologies","volume":"3 4","pages":"Pages 378-384"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.reffit.2017.02.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88282172","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: 23

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 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

Wind characteristics observation using Doppler-SODAR for wind energy applications 利用多普勒- sodar进行风能特征观测

Resource-Efficient Technologies Pub Date : 2017-12-01 DOI: 10.1016/j.reffit.2017.07.001

Prem Kumar Chaurasiya, Siraj Ahmed, Vilas Warudkar

引用次数: 19