Materials Literature
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Transesterification is a widely used reaction in the chemical industry. Currently, industrial-scale transesterification is primarily performed via homogeneous catalysts. Because of downstream separation issues, there is a need for effective heterogeneous catalysts. However, heterogeneous catalysts introduce the drawba…
Kinetics, surface structures, and extent of surface coverage in adsorption of spherical colloids onto uniform and charge-patterned surfaces are studied using dynamic simulations. A Brownian dynamics simulation methodology is developed to account for double-layer and van der Waals interactions between particles and the…
Sodium titanate nanobelt was synthesized by treating titanium dioxide hydrothermally in concentrated sodium hydroxide solution. The product was characterized by SEM analysis and zeta potential measurement. It served as a microparticle to constitute a microparticle retention system with cationic polyacrylamide (CPAM),…
Lithraea molleoides (Vell.) Engl. (Anacardiaceae), is known in South America for its medicinal properties: antiarthritic, haemostatic, diuretic, tonic and useful for the treatment of respiratory diseases. Previously the isolation of a new cytotoxic 5-alkyl resorcinol derivative, 1,3-dihydroxy-5-(tridec-4',7'-dienyl) b…
Hybrid composite phenolic foams reinforced with glass and aramid fibers were prepared and evaluated as potential materials for insulation and cladding applications. In particular, moisture uptake, flammability, and accelerated aging experiments were performed. A statistical approach was employed to model and predict t…
PURPOSE: Monte Carlo simulation is a very useful tool for radiotherapy and diagnostic radiology. Yet even with the latest PCs, simulation of photon spectra emitted by an x-ray tube is a time-consuming task, potentially reducing the possibility to obtain relevant data such as dose evaluations, simulation of geometric s…
Engineering cartilage tissue is challenging, mainly because chondrocytes lose their differentiated phenotype when cultured in monolayer. The aim of this study was to analyse the influence of 3D-culture conditions on the redifferentiation of chondrocytes, devoting special attention to BMPs. Dedifferentiated chondrocyte…
Länger leben dank Vitamin C: N-Oxid-Radikale, die weithin zur dynamischen Kernpolarisation eingesetzt werden, können beim Auflösen durch Abfangreagentien wie Natriumascorbat (Vitamin C) reduziert werden, wodurch Polarisierungsverluste während des Transfers vermieden und transversale wie longitudinale Relaxationszeiten…
Synthesis of a bis-strapped porphyrin with a pyridyl residue on one side and a malonic acid on the other side gives after iron(II) insertion a six-coordinate complex in which both apical groups are the two axial ligands of the iron atom. Unexpectedly, this six-coordinate iron(II) complex proves to be high-spin, likely…
The Josephson current through a long $s$-wave superconductor/weak ferromagnet/$s$-wave superconductor weak link is studied theoretically in the regime of nonequilibrium spin-dependent occupation of electron states in the ferromagnetic interlayer. While under the considered nonequilibrium conditions, the standard super…
To control the dynamics of dialysis-induced anisotropic gel formation, we have derived a theoretical expression for the development of the gel layer for a simple case where no cross-link sites for cross-linking agents exists and the inflow and the outflow of low molecular weight components through the dialysis membran…
The need to improve the performance of modern tokamak operations has led to a further development of the plasma shape and position control systems. In particular, extremely elongated plasmas, with high vertical-instability growth rate, are envisaged to reach the required performance for ignition. This request for bett…
To determine the anti-complement activity of natural diterpenes, chromatographic separation of the acetone-soluble fraction from the roots of Clerodendrum bungei (Verbenaceae) led to the isolation of five diterpenoids. An acetone-soluble extract of the roots of C. bungei exhibited significant anti-complement activity…
The thermal characteristics of de-energized ac motors are largely different from those of operating ac motors. For ac motors operated with intermittent periodic duty cycles, conventional techniques largely overestimate the required thermal recovery time in each operating cycle, which results in the reduction of usage…
Electric arc furnaces (EAFs) produce voltage fluctuations and flicker because of the reactive power severe variations. Furthermore, these loads absorb a large amount of reactive power. The static VAr compensators (SVCs) have been widely used by the industrial customers with arc furnaces to compensate the reactive powe…
An investigation was performed to determine how aspects of microstructural changes in polyurethane elastomers vary with composition: the hard segment and soft segment were varied in a family of six segmented copolyurethane elastomers. Two hard segments were compared, based on the rigid model diisocyanate 4,4′-methylen…
Abstract A ZnII coordination polymer {[Zn2(cpa)2(bpy)]·3H2O}n (1) (cpa2– = 4‐(methoxycarbonyl)benzoate and bpy = 4,4′‐bipyridine) has been synthesized under solvothermal condition and structurally characterized. This coordination polymer has nanotubular threefold entangled (2D→3D) structure with embedded water molecul…
Solvent-based methods are commonly employed for the production of polyester-based samples and coatings in both medical device production and research. The influence of solvent casting and subsequent drying time was studied using thermal analysis, spectroscopy and weight measurement for four grades of 50 : 50 poly(lact…
Swietenia mahagoni have been used in traditional medicine for treatment of different diseases. Present study was performed to evaluate anti-ulcerogenic activity of ethanol seed extract against ethanol induced gastric mucosal injury in rats. Six groups of rats were orally pre-treated respectively with carboxymethyl cel…
Abstract The solubility of CO2 in native potato starch (NPS) and potato starch acetate (SA) at two different temperatures (50°C and 120°C) and various pressures (up to 25 MPa) was determined using a magnetic suspension balance. Within the experimental window, a maximum solubility of 31 mg CO2/gsample for NPS and 79.4…