88,291 research outputs found
Modeling of a smart grid system using real time data on NEPLAN
No full textThe simulation model of the Smart Grids Laboratory of the Institute of Energy and Transport is presented in this paper and a day of its operation is analyzed. The developed model simulates six different modules (a photovoltaic array, a Li-ion battery storage system, a small wind turbine, a diesel generator, a laboratory load and the connection point with the grid). The modules are connected radially at a common bus
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Statistical modeling of Chevreul's salt recovery from leach solutions containing copper
No full textIn this study, oxidized copper ore was dissolved under optimum conditions [temperature 14 degrees C, average particle size 2.8 mm, stirring speed 500 rpm, ammonia concentration 2.824 mol L-1, ammonium sulphate concentration 0.236 mol L-1, solid-to-liquid ratio 0.167 g mL(-1), leaching time 2 h] in an aqueous NH3-(NH4)(2) SO4 solution [T. Calban, S. Colak, M. Yesilyurt, Optimization of leaching of copper from oxidized copper ore in NH3-(NH4)(2)SO4 medium, Chem. Eng. Commun., in press]. Chevreul's salt was precipitated by passing SO2 from these leach solutions. Chevreul's salt, a mixed valence copper sulfite Cu2SO3 center dot CuSO3 center dot 2H(2)O, was characterized by XRD and SEM. The effects of parameters, such as temperature, pH, stirring speed and reaction time, were investigated on precipitation of Chevreul's salt. 2" factorial experimental design and orthogonal central composite design methods in the precipitation experiments were used. It was observed that the most effective parameters on the precipitation of Chevreul's salt were temperature, stirring speed and reaction time. The optimum conditions established for maximum copper precipitation were: temperature 62 degrees C, pH 3, stirring speed 600 rpm, reaction time 12 min. Fixed parameters chosen at the initial stage of the reaction were: SO2 flow rate 358 L h(-1), concentration of CuSO4 solution 7.383 g Cu L-1. Under these optimum conditions, the percentage of copper precipitated from leach solution was 99.92. (c) 2005 Elsevier B.V. All rights reserved
First report of Ktariella polyorchis (Monogenea: Calceostomatidae) infection in farmed meagre Argyrosomus regius (Actinopterygii: Sciaenidae), with a review of calceostomatid parasites of wild and cultured fish
No full textThe present investigation reports a monogenean outbreak in broodstock of meagre Argyrosomus regius (Asso, 1801) from a Croatian farm. The parasites were visible by naked eye and were found in large numbers in the oral cavity and over the body surface. Morphological and molecular analyses allowed to identify the parasites as Ktariella polyorchis Vala & Euzet, 1977 (Monogenea: Calceostomatidae), here reported for the first time in farmed A. regius. Calceostomatids are known to parasitize different fish species of the family Sciaenidae worldwide: particularly, K. polyorchis had been described infecting the gills of wild A. regius caught off Tunisia and Egypt. This work provides the first detailed description of the parasite surface by SEM analysis, and the first molecular data (complete ITS and partial 28 S rDNA sequences), useful in future taxonomical and phylogenetic studies. Furthermore, we provide a synthesis of previous records of calceostomatid parasites of wild and cultured fish, highlighting their role as potential emerging parasites in the farming of sciaenid fish worldwide
C3H7NO2S effect on concrete steel-rebar corrosion in 0.5 M H2SO4 simulating industrial/microbial environment
No full textThis paper investigates C3H7NO2S (Cysteine) effect on the inhibition of reinforcing steel corrosion in concrete immersed in 0.5 M H2SO4, for simulating industrial/microbial environment. Different C3H7NO2S concentrations were admixed, in duplicates, in steel-reinforced concrete samples that were partially immersed in the acidic sulphate environment. Electrochemical monitoring techniques of open circuit potential, as per ASTM C876-91 R99, and corrosion rate, by linear polarization resistance, were then employed for studying anticorrosion effect in steel-reinforced concrete samples by the organic hydrocarbon admixture. Analyses of electrochemical test-data followed ASTM G16-95 R04 prescriptions including probability distribution modeling with significant testing by Kolmogorov-Smirnov and student's t-tests statistics. Results established that all datasets of corrosion potential distributed like the Normal, the Gumbel and the Weibull distributions but that only the Weibull model described all the corrosion rate datasets in the study, as per the Kolmogorov-Smirnov test-statistics. Results of the student's t-test showed that differences of corrosion test-data between duplicated samples with the same C3H7NO2S concentrations were not statistically significant. These results indicated that 0.06878 M C3H7NO2S exhibited optimal inhibition efficiency η = 90.52±1.29% on reinforcing steel corrosion in the concrete samples immersed in 0.5 M H2SO4, simulating industrial/microbial service-environment
The water-soluble zwitterionic and cationic tetra-substituted zinc(II) phthalocyanines: Synthesis, photophysical, photochemical and protein binding properties
No full textThe synthesis and characterization of tetra-(2-EN-((3-dimethylamino)propyl)carbamate]oxyethyl} substituted zinc(II) phthalocyanine (ZnPc) and its sulfobetaine (S-ZnPc), betaine (B-ZnPc), N-Oxide (N-ZnPc) and cationic (Q-ZnPc) derivatives were described in this study. All novel phthalocyanines were characterized by UV-Vis, FT-IR, H-1 NMR, mass spectroscopic techniques and elemental analysis as well. The solubility of these phthalocyanines was enhanced in polar solvents and aquatic media by the conversion of amidoamine groups on the substituents to the zwitterionic sulfobetaine, betaine, N-Oxide, and quaternary ammonium counterparts which make them promising candidates for treatment of cancer via photodynamic therapy (PDT) method. Although the photophysical and photochemical properties of newly synthesized tetra-{2-[N-((3-dimethylamino)propyl)carbamateloxyethyl} substituted zinc(II) phthalocyanine (ZnPc) was investigated in DMSO, its zwitterionic and cationic derivatives were examined in both DMSO and aqueous solutions. The binding behavior of zwitterionic and cationic zinc(II) phthalocyanines were investigated by bovine serum albumin (BSA) protein in aqueous solutions for determination of transportation abilities of these phthalocyanines in the blood. (C) 2016 Elsevier Ltd. All rights reserved
Supplemental Material - Exposure to Cadmium Telluride Quantum Dots and Gene Expression Profile of Huh-7 Hepatocellular Carcinoma Cell Line
No full textSupplemental Material for Exposure to Cadmium Telluride Quantum Dots and Gene Expression Profile of Huh-7 Hepatocellular Carcinoma Cell Line by Hani Alothaid, Mashael R. Al-Anazi, Arwa A. Al-Qahtani, Dilek Colak, Azeez Yusuf, Mohammed S. Aldughaim, Ali M. Mahzari, Mahmoud M. Habibullah, Saud Alarifi, Saad Alkahtani, and Ahmed A. Al-Qahtani in Dose-Response.</p
Author Correction: A global analysis of terrestrial plant litter dynamics in non-perennial waterways
No full text© 2018 The Author(s) In the version of this Article originally published, the affiliation for M. I. Arce was incorrect; it should have been:5Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany. This has now been corrected in the online versions of the Article
Studies on Thermal Reactions and Sintering Behaviour of Red Clays by Irreversible Dilatometry
No full textThermal behavior of clays strongly influences that of ceramic bodies made thereof and hence, its study is must for assessing its utility in ceramic products as well as to set the body composition. Irreversible dilatometry is an effective thermal analysis tool for evaluating thermal reactions as well as sintering behavior of clays or clay based ceramic bodies. In this study, irreversible dilatometry of four red clay samples (S, M, R and G) of Gujarat region, which vary in their chemical and mineralogical compositions was carried out using a Dilatometer and compared. Chemical analysis and XRD of red clays were carried out. XRD showed that major clay minerals in S, M and R clays are kaolinite. However, clay marked R and G showed presence of both kaolinite and illite and / muscovite. Presence of non-clay minerals such as hematite, quartz, anatase were also observed in all clays. XRD results were in agreement with chemical analyses results. Rational analyses showed variation in amount of clay and non-clay minerals in red clay samples. Evaluation of dilatometric curves showed that clay marked as S, M and R exhibit patterns typical for kaolinitic clays. Variation in linear expansion (up to 550 degrees C) and shrinkage (above 550 degrees C) between these three clays was found to be related to difference in amount of quartz and kaolinite respectively. However, dilatometric curve of G exhibit a pattern similar to that for an illitic clay. This study confirmed that sintering of investigated kaolinitic and illitic and / muscovitic red clays initiates at above 1060 degrees C and 860 degrees C respectively and this behaviour strongly depends upon type and amount of minerals and their chemical compositions
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