Materials Literature
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Pathologic calcification is thought to be the main cause of failure in the present generation tissue valves fabricated from glutaraldehyde pretreated bovine pericardium (BP). The present investigation describes the in vitro calcification and enzymatic degradation of bovine pericardia after hexamethylene diisocyanate (…
The feasibility of PVDF (polyvinylidene fluoride), as a novel waterproof and moisture-permeable material, to substitute PTFE (polytetrafluoroethylene) for manufacturing civil high-performance textiles was discussed. The work was focused on the design of casting solution composition (including solvent, additives, and p…
High-molecular-weight polymers of ϵ-caprolactone (CL) and maleic anhydride (MA) with anhydride group content of about 1% wt have been synthesized and studied. The polymerization reaction was carried out in bulk under nitrogen atmosphere. Stannous octoate (Sn(oct)2), and 2,2'-azobisisobutyronitrile (AIBN) were used as…
Heavily cold drawn in situ Cu–Nb composites have been investigated by transmission electron microscopy (TEM) and X‐ray analysis. Dislocation density in the copper matrix has been shown to change only slightly in the investigated drawing ratio range because of the development of stage IV of deformation. In Nb filaments…
Melt nucleation and crystallization behavior of homo-isotatic polypropylene (homo-iPP), maleic anhydride (MAH)-grafted-iPP, and MAH-modified iPP, produced from iPP and a small amount of MAH-grafted-iPP, was investigated by polarizing optical microscopy (POM), at Tc = 121–135oC. Nucleation processes at a given Tc were…
Two new cardiac glycosides called cheiranthosides VI (2) and VII (3) were isolated together with a known one, glucoerysimoside (1) from the seeds of Erysimum cheiranthoides. Based on spectroscopic data, the structures of 2 and 3 were characterized as periplogenin 3-O-beta-D-glucopyranosyl(1-->4)-beta-D-fucopyranoside…
The electrochemical polymerization of thiophene in an ultrasonic field was performed with a view to obtaining polythiophene film with a high electrical conductivity. The conductivity, polymer yield, and morphology of a film were greatly affected by the polymerization temperature, monomer concentration, and current den…
This paper deals with the influence of interface between polyethylene and semiconducting electrode on the space charge formation and electrical breakdown. Low-density polyethylene (LDPE) films attached with different semiconducting electrodes were subjected to the DC breakdown test, and corresponding space charge dist…
Excellent transparent YAG (Y3Al5O12) ceramics containing Ce additives of 0.06 to 3.8mol% and small amount of Si as sintering aids were fabricated by a simple solid-state reaction method using high-purity powders of Y2O3, Al2O3 and CeO2. Ce: YAG ceramics, after vacuum sintering at 1750°C for 10h, became fully transpare…
We investigate experimentally the behavior of microscopic ferrofluid droplets under the effect of a rotating external magnetic field. Depending on the system control parameters, the drops adopt fascinating shapes, like starfish, rod-like or pancake shapes, co-rotating with the external field, but also creeping snakes,…
We compare two angular regimes for the measurement of changes in the real refractive index of bulk fluid analytes. The measurements are based on the use of the Kretschmann-Raether configuration to sense a change in reflectivity with index. Specifically, we numerically simulate the relative sensitivities of the total i…
This publication is an output from a research project funded by the United Kingdom Department for International Development (DFID) for the benefit of developing countries. The views expressed are not necessarily those of DFID.
In order to investigate the structural relationship between inorganic phase and collagen fibrils in the calcified tissues of lower vertebrates we have carried out a wide and small angle X-ray diffraction investigation on carp scales and bone samples. The small angle patterns from decalcified bone and scales, as well a…
By reacting [Re(CO)3(Hpz)2(pz)] (Hpz = pyrazole) with [Mn(CO)5Br] in toluene in the presence of Et3N, the dinuclear complex [(CO)3Re(pz)3Mn(CO)3](Et3NH) (1) was obtained. The reaction of 1 with molecular oxygen affords the tetranuclear compound [(CO)3Re(pz)3Mn(O)3Mn(pz)3Re(CO)3](Et3NH)2 (3) or the trinuclear compound…
Perigraft fluid from Staphylococcus epidermidis infected grafts in a mouse model significantly inhibits fibroblast proliferation (60-98% at 7 and 28 days), compared with perigraft fluid from sterile grafts. The fibroblast inhibitor was trypsin-heat resistant and dependent primarily upon the bacteria, not the host proi…
A variety of long alkyl acetylenic compounds was synthesized and polymerized by using Rh(I) catalysts. Particularly, the monomer having a terminal hydroxyl group was converted into the high molecular weight of polymer in good conversion, which was soluble in THF, DMSO, and DMF. The high stereoregularity (cis) in the m…
Molybdenum disulfide single crystal (0002) plane XPS spectra are presented. The specimen is a natural mineral of graphite-like layered structure. The sample was in situ peeled in the analysis chamber. The spectra include a survey scan, core level Mo 3d5/2, 3d3/2, S 2s, 2p3/2, 2p1/2, 3s, and valence band. The spectra w…
The condition of brain of brain activity resulting from pressure exerted on the abdomen by waist belts was evaluated by Electroencephalogram (EEG) measurement. We investigated the possibility of estimating psychological and physiological stress arising from waist belts in clothing based on EEG measurements. Waist belt…
Foam extrusion experiments were performed to study the effects of surrounding temperature variation on cell structure and foam density. Linear low density polyethylene and low density polyethylene were used with an endothermic chemical blowing agent in a single screw extruder with a capillary die to form foam rod samp…
The paper reports findings of electric field distribution in power cables with voids entrained in the insulation. The shapes of voids studied are cylindrical and spherical types. Samples studied are oil-impregnated paper-insulated cables and polymer-insulated cables of single-core. The model selected for study is a si…