Materials Literature
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The recently proposed multiferroic state of the charge-transfer salt κ-(BEDT-TTF)2Cu[N(CN)2]Cl has been studied by dc-conductivity, magnetic susceptibility and measurements of the dielectric constant on various differently prepared single crystals. In the majority of crystals, we confirm the existence of an order-diso…
Fibre reinforced polymer (FRP) bars are increasingly being used as replacement of steel reinforcing bars in the design and construction of concrete buildings. However, the deterioration of mechanical properties of FRP materials on heating is, in general, not well known and has not been well characterized for the wide…
Abstract The aspect ratios of common clay minerals have been determined from conductometric titrations. The sample set comprises 11 Na-saturated bentonites, 16 smectites with different interlayer cations, three illites/muscovites and two talc dominated specimens. It is shown that the aspect ratios of smectites saturat…
Abstract— The paper presents simulation results of the field control of phase metal-insulator transition in transistor structures based on vanadium dioxide. The calculations of the field and the electron density in the space charge region in the metallic (M) and semiconducting (S) phases are given. It is shown that…
최근 국내에서는 원유 정제과정에서 많은 양의 부생황이 발생하고 있다. 유황콘크리트는 시멘트 풀을 유황개질 바인더로 대체한 콘크리트로서 시멘트 제조시에 대량으로 발생되는 $CO_2$ 의 저감 및 원유 정제산업에서 부생되는 황을 활용할 수 있는 이점이 있다. 또한 유황콘크리트는 반복해서 재활용할 수 있는 친환경적이고 지속가능한 재료이다. 이 연구에서는 개질유황 바인더를 사용한 유황콘크리트의 물리적 특성을 실험을 통하여 검토하였다. 실험 결과, 유황콘크리트는 대체적으로 50~80MPa 이상의 고강도 특성을 보였다. 단위질량, 탄성계수 및 인장강도는 포틀랜드 시멘트 콘크리…
Effect of yarn linear density in the inner and outer layer of single jersey plated knits on heat and moisture transport and air permeability of resultant fabrics has been studied. These three factors all together determine the comfort of the wearer. Statistical analysis indicates that thermal resistance of the fabric…
Activated carbon fibers (ACFs) are one of the most promising adsorbents due to their outstanding properties, such as more exposed adsorption surface, narrower pore size distribution, fast adsorption rate and flexibility, in comparison with granular activated carbon and activated carbon powder. In this work, ACFs manuf…
A new liquid crystalline oligomer OLC was synthesized from its monomer having Schiff-base type mesogenic group MLC via free radical polymerization. The chemical structures of all compounds were confirmed using UV, FTIR, 1 H NMR, 13 C NMR and MS spectroscopy. Schiff-base type thermotropic system based on side chain oli…
Nanobiotechnology is a multidisciplinary branch of nanotechnology which includes fabrication of nanosized materials using biological approaches. Highly structured metallic and metal sulfide nanoparticles have been reported to be synthesized by numerous bacteria, fungi, yeasts and viruses. However, biosynthesis of nano…
A pulse chemisorption/reaction system in combination with Fourier transform infrared spectrometer equipped with a diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS) reaction cell and online mass spectrometer is described in detail. Such a system provides an approach to effectively suppress the inte…
The effects of vapor with different chemical properties on corona partial discharges (PDs) at the junction section of the semi-conductive tape and the stress grading tape of stator windings were investigated. The phase resolved partial discharge (PRPD) patterns were collected during the experiment to obtain the charac…
Modification in the physico-chemical properties under long term operating stresses affects charge injection, transport and trapping. Hence space charge measurements are expected to provide an indication of the extent of material degradation. In the present work, space charge measurements are carried out using the Puls…
Abstract The new mineral species grandaite, ideally Sr2Al(AsO4)2(OH), has been discovered on the dump of Valletta mine, Maira Valley, Cuneo province, Piedmont, Italy. Its origin is related to the reaction between the ore minerals and hydrothermal solutions. It occurs in thin masses of bright orange to salmon to brown…
This paper discusses the causes and effects of humidity within indoor substation environments and methods of mitigating these factors. This report briefly explains relative humidity and partial discharge, and the effect of high relative humidity on the inception or level of partial discharge. The report covers the env…
Hidróxidos duplos lamelares (HDL) são intercaladores potenciais aniônicos. Com o objetivo de obter fertilizantes de liberação lenta de nitrato, foram sintetizados HDL com a fórmula geral [M2+1-xM3+x(OH)2]x-(NO3)x.yH2O, em que M2+ = Mg2+ e M3+ = Al3+ e, ou, Fe3+, utilizando-se o método de coprecipitação a pH alcalino c…
The photodynamics of optical limiting in colloidal solutions of different-size CdSe/ZnS quantum dots is studied. The behavior of the dependences points to a multistage process that includes the bleaching and optical limiting stages. The limiting photodynamics is compared with luminescence dynamics of quantum dots unde…
Abstract Normative mineralogical calculations from bulk geochemistry of sedimentary rocks are problematic because of variable depositional environments, particle hydraulics and sedimentary source systems. The development of SEDMIN, a Microsoft Excel™ spreadsheet solution, is a practical attempt for a computational rou…
Sugarcane fibres have been extracted from bagasse by 0.1 N NaOH treatment and their characteristics are evaluated. The fibres show moderate crystallinity, with crystallinity index in the range 63- 68%. The SEM photographs reveal that the fibre is composed of bundle of cells encrusted by cementing material, outside bun…
Sulfation of MCC by sulfamic acid in DMF or diglyme in the presence of urea was studied for the first\ntime. It was established, that the degree of substitution in sulfated MCC was in the range from 1.40\nto 1.54. It was shown, that the most effective sulfation of MCC takes place in diglyme. The yield of\ncellulose su…
Silicone gel is widely used to encapsulate power electronic circuits. It is well known that surface discharge in the module is one of the weakest points in insulation. These discharges cause the growth of cavity in silicone gel. We have observed the cavity dynamics in order to investigate the degradation process. The…