Materials Literature
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The oxidation of the bis-dioxolene 3,3,3′,3′-tetramethyl-5,6,5′,6′-tetrahydroxy-1,1′-spiro-bis(indane) (CatH2–CatH2) in acidic solution yields the o-quinone-catecholate (Q–CatH2) as a product. The mixed valence character of the molecule is removed on deprotonation yielding the paramagnetic bis-semiquinonato species du…
Details of the microstructure were investigated in Fe5Si3-particles-dispersed Si3N4 ceramics, synthesized by reaction during sintering. The following results were obtained: 1) the size of most part of Fe5Si3 particles was around 2 μm, and those particles had plate-like and roundish form, 2) a linear crack was observed…
Aluminum nitride (AlN) is usually sintered using yttria (Y2O3) as an additive where it reacts with the surface species to form a Y-Al-O-N liquid that promotes particle rearrangement and densification. Construction of the phase relations in this multicomponent system is important for the development of this ceramic. Th…
The wood and leaf samples of eight species are examined by non-isothermal means to determine the mass loss kinetics of the thermal decomposition with linear temperature programming in air atmosphere. A simple kinetic description is developed based on the experimental results and integral analysis method. In the model,…
Melt viscosity of a polypropylene (PP) resin was measured in a capillary rheometer between 220 and 260°C. The melt viscosity showed a power law behavior with strong shear rate dependence. The effects of temperature and shear rate on the degradation were studied in the rheometer by heating at 260 and 280°C, and extrudi…
Ultrasonic waves were used to perform suspension polymerization of styrene monomer in the absence of both emulsifier (surfactant) and polymerization initiator. Styrene monomer was ultrasonically dispersed as oil droplets at 40 kHz after being added dropwise into water. Polymerization of the monomer in the droplets was…
We report a systematic investigation on in situ reduction kinetics of silica in carbon based materials for refractories as a function of system parameters. The objective of this fundamental study was to establish factors influencing gasification of refractories, which in turn could lead to carbon depletion and refract…
A new method for surface modification based on the arc surface alloying has been proposed and its feasibility has been investigated performing niobium aluminide coating on a niobium base metal. When tungsten arc was used to melt an aluminum plate placed on a niobium block, the niobium surface was also melted and a mel…
In the present paper, the effect of common process electrolytes NaCl, Na2SO4 and CaCl2 on fibre swelling and paper strength has been investigated. Results show that there is an initial increase in ...
Using high drafting on a sliver-to-yarn ring spinning frame requires. some critical conditions. In order to understand what occurs during this process, an experimental design is used, and the most influential parameters and their interactions are determined. This approach is applied to spinning of thick and medium cot…
The electrochemical behavior of K2SiF6 in chloro-fluoride melts and that of SiO2 in carbonate melts has been studied. Silicon, titanium silicides, boron silicide and ternary compounds Ti-Si-B have been deposited from chloro-fluoride melts. Only SiC was deposited from carbonate-silica melts under carbon dioxide atmosph…
Due to thermal ageing several precipitation and segregation processes occur in austenitic-ferritic superduplex stainless steel. During phase transformation processes mostly intermetallic compounds, and-due to the high solved nitrogen content-nitrides appear. These changes in microstructure influence the two original p…
It was found that representatives of Chlorophyta, as distinct from Cyanophyta, are peculiar in having a highly effective pathway involved in detoxification of ammonia. Specific peculiarities as to ammonium nitrogen transformation are the basis of one of the mechanisms regulating ecological successions of species in fr…
New chiral dopants for nematic liquid crystals were synthesized using optically active 4,4,4-trifluoro-3-phenylbutanoic acid. The magnitude of helical twisting power (HTP) was largely influenced by the linkage between the asymmetric frame and the core moiety. The chiral dopant, 4,4,4-trifluoro-1-(4-hexyloxyphenyl)-3-p…
A model that considers combined effects of the interfacial energy and the magnetic anisotropy energy is proposed to examine development of the crystallographically aligned microstructure during annealing under a magnetic field. For ferromagnetic materials with rather large magnetic anisotropy energies, the model indic…
Isotactic polyprpylene (iPP) occurs in several crystalline forms, denoted as f (monoclinic), g (hexagonal), and n (orthorhombic) phases. Hot-stage microscopy, differential scanning calorimetery, and wide-angle X-ray diffraction were used to investigate the influence of thermal treatment and nucleating agents on the mo…
The reduction of horse heart cytochrome cIII by [FeII(edta)(H2O)]2−[FeII(edta)(H2O)]2− + [cytochrome cIII]7+ → [FeIII(edta)(H2O)]− + [cytochrome cII]6+ was reinvestigated as a function of all chemical and physical variables. Possible electrostatic interaction between the oppositely charged redox partners can assist th…
Two octamethyldisiloxa-bridged [3.3]cyclophanes (1 and 2) and a dodecamethyltrissiloxa-bridged [3.3.3]-cage compound (3) were prepared by hydrolysis of the chlorosilyl monomers. This general route was also employed for the preparation of two octamethyldisiloxa-bridged [3.3]heterophanes featuring two thiophene (14) or…
Scanning Electronic Microscopes (SEM) are widely used either for cross‐section measurement (process development) or for top‐down CD measurement (production). ITRS roadmap for CD and overlay metrology points out some difficult challenges for next technology nodes. Up to now, we remained confident respectively in SEM ca…
The effect of eight preparation control factors, i.e. , atmosphere, sintering temperature, sintering time, and ratios, of on mechanoluminescence (ML) intensity has been investigated by the design of experiments and the analysis of variance in order to increase the ML intensity. Consequently, it is proved statistically…