Kaolin-Group Minerals: From Hydrogen-Bonded Layers to Environmental Recorders
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Adsorption and inhibition effect of curcumin on mild steel corrosion in hydrochloric acid
The inhibition effect of curcumin on the corrosion of mild steel in 1.0 M HCl solution was studied by weight loss, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) methods. The experimental results suggest that this compound is an efficient corrosion inhibitor and the inhibition eff…
Adsorption and Inhibitive Properties of Ruta chalepensis L. Oil as a Green Inhibitor of Steel in 1 M Hydrochloric Acid Medium
Inhibition of steel corrosion by Ruta chalepensis L. oil has been investigated in aqueous 1 M hydrochloric acid solution using weight loss method, potentiodynamic polarization, electrochemical and impedance spectroscopy (EIS). The inhibition efficiency of R. chalepensis L. oil was calculated and compared. We note good…
High Strain-Rate Compressive Behavior and Constitutive Modeling of Selected Polymers Using Modified Ramberg-Osgood Equation
The present paper is concerned with constitutive modeling of the compressive stress-strain behavior of selected polymers at strain rates from 10-3 to 103/s using a modified Ramberg-Osgood equation. High strain-rate compressive stress-strain curves up to strains of nearly 0.08 for four different commercially available…
해역별 굴 패각의 특성비교
Shell of oyster has a function of shelter from predator as well as growth potential. We investigated the physicochemical characteristics of oyster shells from three difference oyster farms. The shells from Wando waters characterized high stability of nanostructure, ticker nacreous layer, high thermal decomposition tem…
다이메틸설폭시화물 용매를 사용한 PVC-LMO 비드의 제조와 리튬 이온 흡착 특성
본 연구에서는 노말 메틸 피로리돈(N-methyl-2-pyrrolidone, NMP)을 대신하여 다이메틸설폭시화물(dimethyl sulfoxide, DMSO)을 용매로 사용하여 폴리염화비닐 (poly vinyl chloride, PVC)로 리튬망간산화물(lithium manganese oxide, LMO)를 고정화하여 PVC-LMO 비드를 제조하였다. XRD 분석을 통해 PVC-LMO 비드내에 LMO가 잘 고정화 된 것을 확인 하였다. 합성한 PVC-LMO 비드의 크기는 약 4 mm였다. PVC-LMO 비드에 의한 리튬이온 흡착 실험은 회분식으로 수행하였다. 랭뮤…
Morphological Characterization by SEM, TEM and AFM of Nanoparticles and Functional Nanocomposites Based on Natural Rubber Filled with Oxide Nanopowders
Nanocomposites were prepared from mixture of different concentrations of ferroelectric nanoparticles in an elastomeric matrix based on the vulcanized natural rubber. The morphological characterization of nanocomposites was carried out using Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and…
Acoustic detection of stress-corrosion cracking of nitrogen austenitic steels
Structural changes and resistance to the stress-corrosion cracking of the nitrogen-bearing austenitic steels 04Kh20N6G11M2AFB and 09Kh20N6G11M2AFB (with 0.04 and 0.09 wt % C, respectively) after different treatments, including thermomechanical action, quenching from 1200°C, and aging at 700°C for 2 and 10 h, have been…
Development of the rectangular ultrasonic radiator of the stair-step form
The article is devoted to the development of ultrasonic radiator in form of stair-step plate. The influence of radiator sizes on frequency and vibration amplitude is studied. On the base of the represented calculations it was determined the set of recommendations for designing of such radiators.
Temperature dependence of the optical characteristics and surface plasmon resonance of core-shell nanoparticles
The temperature dependence of the optical absorption of core-shell nanoparticles is investigated in the framework of the quasi-static approximation at finite temperature with regarding to the Maxwell-Garnett model for random nanocomposite. The effect of temperature on the surface plasmon resonance and spectral propert…
Multiscale electromagnetic SERS enhancement on self‐assembled micropatterned gold nanoparticle films
In this work, we demonstrate a cascaded, multiplicative electromagnetic enhancement effect in surface‐enhanced Raman scattering (SERS) on periodically micropatterned films made of colloidal gold nanoparticles, prepared by a self‐assembly approach, without implying lithography procedures. The multiplicative enhancement…
New modeling approach and validation of a thermoelectric generator
In this paper, a mathematical modeling of a Thermoelectric Module (TEM) is presented. The modeling is based on several studies presented in literature with some correction of mistaken equations. The presented model is developed using different approach taking into consideration the modeling of the Maximum Power Point…
Electronic and Optic Properties of Cubic Spinel CdX 2 O 4 (X=In, Ga, Al) through Modified Becke—Johnson Potential
A new potential approximation known as modified Becke—Johnson based on density functional theory is applied to compute the electronic band profile and optical response of CdIn2O4, CdGa2O4 and CdAl2O4 compounds. The direct band gap with common LDA, GGA and EV-GGA is drastically underestimated compared with modified Bec…
Insulation characteristics of epoxy insulator with internal crack-shaped micro-defects - study on the equivalence of accelerated degradation by frequency acceleration test
Generally, insulating spacers of gas insulated switchgear (GIS) have outstanding durability and are not considered prone to insulation failure within a design life of about 30 years, provided the products conform and have passed the partial discharge (PD) test. However, to assume operation over 30 years, degradation c…
Organotypic culture to assess cell adhesion, growth and alignment of different organs on silk fibroin
Glass sheets covered with aligned electrospun silk fibroin (Bombyx mori) were compared to tissue culture-treated Thermanox® coverslips, using an organotypic culture method. Different chick embryo organ behaviours were analysed in terms of circularity, cell growth and cell adhesion after being cultivated in contact wit…
24.1: A Method for Analyzing the Eye Strain in Fringe‐Field‐Switching LCD under Low‐Frequency Driving
Abstract We have presented the brightness changes in positive and negative dielectric anisotropy liquid crystal (P‐LC and N‐LC) with different alignment materials for no eye‐strain at low frequencies. We propose a method for analyzing the brightness changes and find that flexoelectric effect (FEE) is a dominant factor…
Comparative analysis of physicochemical properties of dinuclear zinc(II) helicates with 2,2′-, 2,3′-, and 3,3′-bis(dipyrromethenes)
The effect of the attachment position of a methylene spacer in 2,2′-, 2,3′-, and 3,3′-bis(dipyrromethene) N 4 -ligands (H 2 L) on physicochemical properties of their dinuclear homoleptic helicates [Zn 2 L 2 ], such as specific features of their molecular structure, luminescence spectral characteristics, lability in ac…
The UV and IR Comparative Spectrophotometric Study of Some Saturated and Lacunary Polyoxometalates
Abstract Objectives: The polyoxometalates are a class of inorganic compounds with controllable shapes and sizes, and with excellent properties that make them attractive for various applications. This study is aimed at the comparative UV and IR spectra of Keggin type polyoxometalates. Methods: Compounds under (UV and I…
A Size-dependent Bernoulli-Euler Beam Formulation based on a New Model of Couple Stress Theory
In this paper, a size-dependent formulation for the Bernoulli-Euler beam is developed based on a new model of couple stress theory presented by Hadjesfandiari and Dargush. The constitutive equation obtained in this new model, consists of only one length scale parameter that is capable of capturing the micro-structural…
Synthesis and characterization of low-loss Fe3O4-PDMS magneto-dielectric polymer nanocomposites for RF applications
This paper presents the methodologies for synthesis and characterization of a new class of low loss Fe3O4-PDMS polymer nanocomposites, which exhibits well-tailored magneto-dielectric properties. Single crystalline Fe3O4nanoparticles with a small size distribution of 7.5 ± 2nm were prepared by chemical precipitation me…