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Articles 31 - 60 of 260
Full-Text Articles in Physical Sciences and Mathematics
Synthesis And Characterization Of Cuo Nanosheets In Polyvinylpyrrolidone By Quick Precipitation Method, Mahdi Shahmiri
Synthesis And Characterization Of Cuo Nanosheets In Polyvinylpyrrolidone By Quick Precipitation Method, Mahdi Shahmiri
mahdi shahmiri
In this project, CuO nanosheets were grown successfully in polyvinylpyrrolidone (PVP) by a simple and quick chemical method in the absence of templates. Copper nitrate, PVP and sodium hydroxide were used as copper precursor, stabilizer and accelerator, respectively. The products were characterized by X-ray diffraction (XRD), UV–vis spectroscopy, field emission scanning electron microscopy (FE-SEM), energy dispersive analysis of X-rays (EDAX), transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) spectroscopy. The result of the XRD and EDAX confirmed the formation of pure single-phase CuO. Generation of the CuO nanosheets and nanorods were confirmed by UV–visible spectra. FE-SEM depicted that layered …
59 Articles, Fathi Habashi
59 Articles, Fathi Habashi
Fathi Habashi
Metal ions play an essential role in the functioning of all biological systems. They interact with charged and polar groups of all biopolymers. The study of structural and functional properties of metal binding proteins is an important area of modern physical and chemical biology. Metal cations and metal binding proteins are involved in all crucial cellular activities. Many pathological conditions are correlated with abnormal metal metabolism. Encyclopedia of Metalloproteins is a key resource that provides basic, accessible, and comprehensible information about this expanding field.
Mechaniczny Rozdział Faz Proj., Wojciech M. Budzianowski
Mechaniczny Rozdział Faz Proj., Wojciech M. Budzianowski
Wojciech Budzianowski
No abstract provided.
Challenges And Prospects Of Processes Utilising Carbonic Anhydrase For Co2 Separation, Patrycja Szeligiewicz, Wojciech M. Budzianowski
Challenges And Prospects Of Processes Utilising Carbonic Anhydrase For Co2 Separation, Patrycja Szeligiewicz, Wojciech M. Budzianowski
Wojciech Budzianowski
This article provides an analysis of processes for separation CO2 by using carbonic anhydrase enzyme with particular emphasis on reactive-membrane solutions. Three available processes are characterised. Main challenges and prospects are given. It is found that in view of numerous challenges practical applications of these processes will be difficult in near future. Further research is therefore needed for improving existing processes through finding methods for eliminating their main drawbacks such as short lifetime of carbonic anhydrase or low resistance of reactive membrane systems to impurities contained in flue gases from power plants.
Breaking The Theft-Chain-Cycle: Property Marking As A Defensive Tool, William J. Bailey, David J. Brooks
Breaking The Theft-Chain-Cycle: Property Marking As A Defensive Tool, William J. Bailey, David J. Brooks
Bill Bailey
The theft of property and its associated impact effects many parts of society. For example, a considerable amount of resources are expended in trying to reduce property theft, as such crime engenders both a financial and emotional impact (Grabosky, 1995, p. 1) on those involved. Factors such as fear of crime, increased insurance premiums and victimization are all outcomes of property crime. Much of the past research has focused on the mitigation of such crimes, collectively termed as ‘crime prevention’. Crime prevention are “any actions designed to reduce the actual level of crime and/or the perceived crime” (S.P. Lab, 2010, …
Insights Into Forest Soil Carbon Dynamics From Nuclear Magnetic Resonance Spectroscopy, Chris E. Johnson
Insights Into Forest Soil Carbon Dynamics From Nuclear Magnetic Resonance Spectroscopy, Chris E. Johnson
Chris E Johnson
No abstract provided.
Singlet Excited States Of Anions With Higher Main Group Elements, Ryan C. Fortenberry
Singlet Excited States Of Anions With Higher Main Group Elements, Ryan C. Fortenberry
Ryan C. Fortenberry
Previous studies have shown that dipole-bound excited states exist for certain small anions. However, valence excited states have been reported for some closed-shell anions, but those with singlet valence excited states have, thus far, contained a single silicon atom. This work uses high-level coupled cluster theory previously shown to reproduce excited state energies to better than 0.1 eV compared with experiment in order to examine the electronic excited state properties of anions containing silicon and other higher main group atoms as well as their first row analogues. Of the 14 anions involved in this study, 9 possess bound excited states …
Theoretical Electronic And Rovibrational Studies For Anions Of Interest To The Dibs, Ryan C. Fortenberry
Theoretical Electronic And Rovibrational Studies For Anions Of Interest To The Dibs, Ryan C. Fortenberry
Ryan C. Fortenberry
The dipole-bound excited state of the methylene nitrile anion (CH2CN−) has been suggested as a candidate carrier for a diffuse interstellar band (DIB) at 803.8 nm. Its corresponding radical has been detected in the interstellar medium (ISM), making the existence for the anion possible. This work applies state-of-the-art ab initio methods such as coupled cluster theory to reproduce accurately the electronic excitations for CH2CN− and the similar methylene enolate anion, CH2CHO−. This same approach has been employed to indicate that 19 other anions may possess electronically excited states, five of which are valence in nature. Concurrently, in order to assist …
The Anthropogenic Influence On Cuejdi River Water Quality, Andreea Ghiurcă, Andreea Lămășanu, Florin C. Mihai
The Anthropogenic Influence On Cuejdi River Water Quality, Andreea Ghiurcă, Andreea Lămășanu, Florin C. Mihai
Florin C MIHAI
Water pollution is caused in rural areas, especially by uncontrolled waste deposits located in river bed and in urban areas is discharged, irregular, untreated sewage. The Cuejdiu River is a tributary of the Bitriţa River in the left side, with a total length of 24 km. Evaluation of water quality of the Cuejdiu River was achieved by processing the results obtained from tests analyzed for 30 samples, taken on March 17, 2012, between the mouth of the River Bestriţa and up to the exit of the village Cuiejdi. Analysis of water samples were performed in the laboratory of the Department …
Ultimate Detectability Of Volatile Organic Compounds: How Much Further Can We Reduce Their Ambient Air Sample Volumes For Analysis?, Ki-Hyun Kim
Ki-Hyun Kim
To understand the ultimately lowest detection range of volatile organic compounds (VOCs) in air, application of a high sensitivity analytical system was investigated by coupling thermal desorption (TD) technique with gas chromatography (GC) and time of flight (TOF) mass spectrometry (MS). The performance of the TD-GC-TOF MS system was evaluated using liquid standards of 19 target VOCs prepared in the range of 35 pg to 2.79 ng per μL. Studies were carried out using both total ion chromatograms (TIC) and extracted ion chromatograms (EIC) mode. EIC mode was used for calibration to reduce background and to improve signal to noise. …
Chemical Properties Of Forest Soils In The Catskills Region, Chris E. Johnson
Chemical Properties Of Forest Soils In The Catskills Region, Chris E. Johnson
Chris E Johnson
No abstract provided.
Recovery Of Sensitive Watersheds In The Northeastern United States From Chronic Acidification: The Role Of Soil Chemistry, Chris E. Johnson
Recovery Of Sensitive Watersheds In The Northeastern United States From Chronic Acidification: The Role Of Soil Chemistry, Chris E. Johnson
Chris E Johnson
No abstract provided.
Room Temperature Syntheses Of Entirely Diverse Substituted Β-Fluorofurans, Li Yan, Kraig A. Wheeler, Roman Dembinski
Room Temperature Syntheses Of Entirely Diverse Substituted Β-Fluorofurans, Li Yan, Kraig A. Wheeler, Roman Dembinski
Kraig A. Wheeler
Synthesis of highly substituted 3-fluorofurans is reported. The sequence began with preparation of tertbutyldimethylsilyl alk-1-en-3-yn-1-yl ethers from 1,4-disubstituted alk-3-yn-1-ones. Subsequent fluorination of alkenynyl silyl ethers with Selectfluor gave 2-fluoroalk-3-yn-1-ones in almost quantitative yield. Subsequent 5-endo-dig cyclizations using chlorotriphenylphosphine gold(I)/silver trifluoromethanesulfonate (5/5 mol%), N-bromo- or N-iodosuccinimide and gold(I) chloride/zinc bromide (5/20 mol%), all at room temperature, provided a facile method for the generation of substituted 3-fluoro-, 3-bromo-4-fluoro-, and 3-fluoro-4-iodofurans in good yields. Also, 2,2-difluoroalk-3-yn-1-ones were prepared by fluorination of alk-3-yn-1-ones under organocatalytic conditions. The structures of (Z)-tertbutyldimethylsilyl but-1-en-3-yn-1-yl ether, 3-bromo-4-fluorofuran, and 3-fluoro-4-(phenylethynyl)furan were confirmed by X-ray crystallography.
Nanocrystalline Amn2o4 (A = Co, Ni, Cu) Spinels For Remediation Of Volatile Organic Compounds—Synthesis, Characterization And Catalytic Performance, Ali Hosseini, Ali Niaei, Darioush Salari, Reza Nabavi
Nanocrystalline Amn2o4 (A = Co, Ni, Cu) Spinels For Remediation Of Volatile Organic Compounds—Synthesis, Characterization And Catalytic Performance, Ali Hosseini, Ali Niaei, Darioush Salari, Reza Nabavi
Seyed Reza nabavi
Nanocrystalline AMn2O4 (A = Co, Ni, Cu) manganite spinels were prepared by using the sol–gel auto combustion method under the same
synthesis conditions and their physico-chemical properties were studied by XRD, UV–vis DRS, SEM, BET and FTIR. Besides, the reducibility of
oxides was studied by temperature-programmed reduction (TPR). The relationship between the properties and activity of spinels in oxidation of 2-
propanol and toluene was investigated. Among all, nickel manganite exhibited the most promising activity, in which the completed conversion of 2-
propanol and toluene occurred at 250 and 350 8C, respectively. Higher activity of nickel manganite oxide was explained …
Butylated Hydroxytoluene Analogs: Synthesis And Evaluation Of Their Multipotent Antioxidant Activities, Azhar Ariffin
Butylated Hydroxytoluene Analogs: Synthesis And Evaluation Of Their Multipotent Antioxidant Activities, Azhar Ariffin
Azhar Ariffin
A computer-aided predictions of antioxidant activities were performed with the Prediction Activity Spectra of Substances (PASS) program. Antioxidant activity of compounds 1, 3, 4 and 5 were studied using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and lipid peroxidation assays to verify the predictions obtained by the PASS program. Compounds 3 and 5 showed more inhibition of DPPH stable free radical at 10(-4) M than the well-known standard antioxidant, butylated hydroxytoluene (BHT). Compound 5 exhibited promising in vitro inhibition of Fe2+-induced lipid peroxidation of the essential egg yolk as a lipid-rich medium (83.99%, IC50 16.07 +/- 3.51 mu M/mL) compared to alpha-tocopherol (alpha-TOH, 84.6%, IC50 …
Kinetic Analytical Method For Determination Of Uric Acid In Human Urine Using Analyte Pulse Perturbation Technique, Zeljko D. Cupic
Kinetic Analytical Method For Determination Of Uric Acid In Human Urine Using Analyte Pulse Perturbation Technique, Zeljko D. Cupic
Zeljko D Cupic
No abstract provided.
Determination Of Λ-Cyhalothrin In Palm And Palm Kernel Oils Using Tandem Solid-Phase Extraction Cartridges, Nor Kartini Binti Abu Bakar
Determination Of Λ-Cyhalothrin In Palm And Palm Kernel Oils Using Tandem Solid-Phase Extraction Cartridges, Nor Kartini Binti Abu Bakar
Nor Kartini Binti Abu Bakar
This article outlines a new method based on low-temperature fat precipitation extraction with acetonitrile and graphitised carbon black/primary secondary amine (GCB/PSA) solid-phase extraction clean-up for the extraction of lambda-cyhalothrin residue in both crude palm oil (CPO) and crude palm kernel oil (CPKO). Determination of lambda-cyhalothrin was then carried out using gas chromatography (GC) equipped with an electron capture detector (ECD). Analyses for lambda-cyhalothrin in palm oil and palm kernel oil samples spiked with different levels of lambda-cyhalothrin (0.05, 0.08, 0.1, 0.5, and 1.0 mu g g(-1)) were performed. Mean recoveries for six replicates ranged from 82% to 98% for CPO …
Synthesis, Characterization And Nonlinear Optical Properties Of Silver/Pva Nanocomposites, Mahdi Shahmiri
Synthesis, Characterization And Nonlinear Optical Properties Of Silver/Pva Nanocomposites, Mahdi Shahmiri
mahdi shahmiri
Silver/polyvinyl alcohol (PVA) nanocomposites are prepared via quick precipitation method, using hydrazine as a reducing agent. Preparing of silver/PVA nanocomposites by this method is done for the first time. The samples are characterized by Uv-Visible spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM). Nonlinear optical properties are carried out by Z-scan technique using a blue CW laser beam operated at wavelength 405 nm. It is shown that the synthesized samples have negative nonlinear refractive index and the magnitude is in the order of 108. The nonlinear refractive index increases as amount of reducing agent increases.
Pyrite. History, Chemistry, And Metallurgy, Fathi Habashi
Pyrite. History, Chemistry, And Metallurgy, Fathi Habashi
Fathi Habashi
The Book covers the history of pyrite - - how it was a strategic mineral necessary for the production of elemental sulfur needed for making gunpowder for military purposes and for the production of SO2 needed for making sulfuric acid for the chemical industry. Now its presence is a nuisance in tailings ponds. The book also covers the processing of pyrite containing gold, its chemistry and technology, the processing of pyrite cinder for the production of a variety of metals, and its behaviour towards autotrophic microorganisms.
Facile Synthesis Of A Flexible Tethered Porphyrin Dimer That Preferentially Complexes Fullerene C70, Charles Michael Drain
Facile Synthesis Of A Flexible Tethered Porphyrin Dimer That Preferentially Complexes Fullerene C70, Charles Michael Drain
Charles Michael Drain
A simple, high yield, two-step synthesis yields a porphyrin dimer linked by a flexible dithiol tether that preferentially binds fullerene C70 over C60 in toluene solution. The complex forms stable aggregates when cast on glass
Ogólnotechniczne Podstawy Biotechnologii Z Elementami Grafiki Inżynierskiej Ćw., Wojciech M. Budzianowski
Ogólnotechniczne Podstawy Biotechnologii Z Elementami Grafiki Inżynierskiej Ćw., Wojciech M. Budzianowski
Wojciech Budzianowski
No abstract provided.
Materiały Odstresowujące, Wojciech M. Budzianowski
Materiały Odstresowujące, Wojciech M. Budzianowski
Wojciech Budzianowski
No abstract provided.
5x20 Matrix For Knowledge Management Lifecycle Based On The Five C’S Model And A Critical Review, Philadelphia University
5x20 Matrix For Knowledge Management Lifecycle Based On The Five C’S Model And A Critical Review, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
The Short Story In Jordan Its Origin And Development, Philadelphia University
The Short Story In Jordan Its Origin And Development, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
Oxidative Carbonylation Of 2-Propyn-1-Ol And 2-Methyl-3-Butyn-2-Ol In An Oscillatory Mode, Sergey N. Gorodsky
Oxidative Carbonylation Of 2-Propyn-1-Ol And 2-Methyl-3-Butyn-2-Ol In An Oscillatory Mode, Sergey N. Gorodsky
Sergey N. Gorodsky
No abstract provided.
Lectio Praecursoria, Kari Myöhänen
Lectio Praecursoria, Kari Myöhänen
Kari Myöhänen
Lectio praecursoria: Modelling of combustion and sorbent reactions in three-dimensional flow environment of a circulating fluidized bed furnace
Concentration Oscillations In The Processes Of Unsaturated Compounds Oxidative Carbonylation. 2. Oxidative Carbonylation Of Alkynes In The Palladium Halogen Complexes Solutions (In Russian), Sergey N. Gorodsky
Sergey N. Gorodsky
No abstract provided.
6-[(4-Hydroxyphenyl)Diazenyl]- 1,10-Phenanthrolin-1-Ium Chloride Monohydrate, Akram Hazeen, Yan Zhang, Minchong Mao, Kraig A. Wheeler, Mark E. Mcguire
6-[(4-Hydroxyphenyl)Diazenyl]- 1,10-Phenanthrolin-1-Ium Chloride Monohydrate, Akram Hazeen, Yan Zhang, Minchong Mao, Kraig A. Wheeler, Mark E. Mcguire
Kraig A. Wheeler
In the cation of the title molecular salt, C18H13N4O+_Cl__H2O, the dihedral angle between the mean planes of the 1,10- phenanthroline system and the phenol ring is 14.40 (19)_. The crystal packing is stabilized by O—H_ _ _O hydrogen bonds, weak N—H_ _ _Cl and O—H_ _ _Cl intermolecular interactions and _—_ stacking interactions [centroid–centroid distance = 3.6944 (13) and 3.9702 (12) [A °]
Design Optimization Of An Lpg Thermal Cracker For Multiple Objectives, Reza Nabavi, G.P Rangaiah, A Niaei, D Salari
Design Optimization Of An Lpg Thermal Cracker For Multiple Objectives, Reza Nabavi, G.P Rangaiah, A Niaei, D Salari
Seyed Reza nabavi
Ethylene and propylene, building blocks of the petrochemical industries, are mostly produced by steam cracking of hydrocarbons. In our recent work (Nabavi, Rangaiah, Niaei and Salari, Multiobjective Optimization of an Industrial LPG Thermal Cracker using a First Principles Model, Ind. Eng. Chem. Res. 2009, 48, 9523-9533), operation of an industrial liquefied petroleum gas (LPG) cracker was optimized for several sets of two and three objectives. In this work, optimization of an LPG cracker design is investigated for multiple objectives. The objectives considered are maximization of annual ethylene and propylene production, selectivity and run length, and minimization of severity and total …
Concentration Oscillations In The Processes Of Unsaturated Compounds Oxidative Carbonylation. 1. Processes Of Acetylene And Phenylacetylene Oxidative Carbonylation (In Russian), Sergey N. Gorodsky, Katarina Novakovic
Concentration Oscillations In The Processes Of Unsaturated Compounds Oxidative Carbonylation. 1. Processes Of Acetylene And Phenylacetylene Oxidative Carbonylation (In Russian), Sergey N. Gorodsky, Katarina Novakovic
Sergey N. Gorodsky
This review describes the processes of oxidative carbonylation of acetylene and phenylacetylene, occurring in the oscillatory mode under conditions of homogeneous catalysis by palladium complexes.