Materials Literature
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A micromechanical approach is proposed in this work to predict the initial tensile response under uniaxial loading of a bonded two-dimensional fibrous network consisting of two kinds of fibers. The probabilities and statistical distributions of the hybrid bonding points and free fiber lengths between the bonding point…
Reversible machano- and thermochromic behavior are-features of the title bis(tricyclic) olefin. These characteristics are a consequence of the different proper ties of the interconvertible folded and twisted confomers. Despite the severe molecular deformation the conductive charge-transfer complexes and stable salts o…
TiO 2 thin films were grown onto SrTiO 3 substrates by a molecular beam epitaxy (MBE) method using an oxygen radical source. The structure of the thin films obtained was evaluated by X-ray reflection diffractometer (XRD) and reflection high energy electron diffraction (RHEED); TiO 2 thin films were determined to be of…
The appearance of wave front dislocations under interference among beams with simple wave fronts is considered. It is shown, that even two beams with the smooth wave fonts is possible the formation of dislocations screw type. The screw dislocations are formed in cross point of lines of equal amplitude of beams and min…
We describe a group-theoretical procedure that enables one to find necessary conditions for the appearance of spontaneous magnetization in domain walls. We illustrate the derivation of wall symmetries on example of Cr2O3 and present a brief summary of a systematic analysis of domain walls in antiferromagnetic non-ferr…
The nucleation rate ( I ) versus temperature type of curves for a Na 2 O2·CaO·3SiO 2 (NC 2 S 3 ) glass doped with 0.1 wt% platinum, 0.5 wt% Ag 2 O, and 2.0 wt% P 2 O 5 were determined using a previously developed differential thermal analysis (DTA) technique. In this DTA technique, a constant amount of glass sample wa…
Three bis(1,4,7-triazacyclonon-1-yl) ligands, 1,2-bis(1,4,7-triazacyclonon-1-ylmethyl)benzene (L 1 ), 1,3-bis(1,4,7-triazacyclonon-1-ylmethyl)benzene (L 2 ), and 1,4-bis(1,4,7-triazacyclonon-1-ylmethyl)benzene (L 3 ), have been synthesized and their nickel(II) and copper(II) coordination chemistry investigated. Reacti…
Abstract Poly(2‐alkyl‐2‐oxazoline)s having an acrylate group at both chain ends were synthesized by terminating living bifunctional poly(2‐methyl‐2‐oxazoline) or poly(2‐ethyl‐2‐oxazoline) with acrylic acid. These macromonomers have been polymerized to the corresponding polyoxazoline networks. Thermal as well as UV‐ini…
Iron tellurite glasses in the system Fe2O3–Sb–TeO2 have been prepared by the melt-quenching technique. The glass forming region for the above system has been determined. A comparative study of the direct current electrical conductivity, σ, of the 15Fe2O3–5Sb–80TeO2 (mol%) glass together with 15Fe2O3–5Sb2O3–80TeO2 and…
Single crystals of (VO) 2 (SeO 3 ) 3 have been prepared from SeO 2 and V 2 O 5 . The crystal structure has been determined by single-crystal X-ray diffraction. Crystal data: (VO) 2 (SeO 3 ) 3, M r = 514.75; monoclinic, space group P 2 1 / a (No. 14); cell parameters a = 9.151(1) Å, b = 6.353(1) Å, c = 14.992(1)Å, β =…
The structure of the tetragonal NaBi(MoO4)2 crystal was determined. The space group is I4=S42 with cell dimensions a=5.267, c=11.565 Å and Z=2. The molybdenum atoms occupy two different sites of 4 symmetry. The Na+ and Bi3+ cations are situated on two positions with different occupancy factors and are short-range orde…
Abstract A natural saponite was acid activated at room temperature or 90°C with different acid/clay ratios and the products were characterized by powder X-ray diffraction, infrared spectroscopy and thermogravimetry. The leaching of Mg from the octahedral sheets is enhanced by an increase in the acid/clay ratio and by…
The discovery of Ductile Iron (DI) in 1948 provided new growth markets to the iron foundry industry. Precipitating the graphite phase as nodules in a continuous “pseudo-steel” matrix provided the mechanical strength and impact toughness lacking in gray cast irons. This new class of engineering materials was well suite…
symmetric [5,15-bis[(4'-nitrophenyl)ethynyl]-10,20-diphenylporphinato]copper(II) (I) and electronically asymmetric [5-[4'-(dimethylamino)phenyl]ethynyl]-15-[(4''-nitrophenyl)ethynyl]-10,20-diphenylporphinato]copper(II) (II), which bears both electron-releasing and electron-withdrawing groups conjugated directly to the…
Using the wet-chemistry technique, we selectively reduced the surface of the PEEK film (PEEK-OH), and covalently fixed hexamethylene diisocyanate by addition onto the hydroxyl functions. The resulting PEEK-NCO film displayed free isocyanate termini, the basic hydrolysis of which gave the PEEK-NH2 film in 85% extent of…
Congenital nephrogenic diabetes insipidus (CNDI) is a rare inherited disorder characterized by renal tubular insensitivity to the antidiuretic effect of arginine vasopressin (AVP). In a large majority of the cases, nephrogenic diabetes insipidus is an X-linked recessive disorder caused by mutations in the AVP V2 recep…
The birefringence dispersion of a ferroelastic single domain of magnetoelectric BiFeO3 crystal has been measured at room temperature (24°C) in the rhombohedral phase. A thin (11μm) (110)cubic cut was used although it was not a principal cut. The optical axis (and spontaneous polarization) formed an angle of 35° with t…
The partial hydrogenation of benzene to cyclohexene at 2.34−5.10 MPa of hydrogen, 125−175 °C, was studied over Ru catalysts supported on lanthanum and zinc binary oxides with various atomic ratios in a stirred autoclave and in the presence of an aqueous sodium hydroxide solution. Due to the very small particle size of…
Structure and electrophysical properties of poly(3,4-ethylenedioxythiophene) (PEDOT) films electrochemically doped with PF 6 -, BF 4 -, and CF 3 SO 3 - have been studied. According to SEM and XRD studies, doped PEDOT films have amorphous fibrillar structure. Thermal studies show that continuous degradation occurs abov…
Recent simulation work has indicated that channeling of charged substrates between the active sites of bifunctional enzymes or bienzyme complexes can be significantly enhanced by favorable interactions with the electrostatic field of the enzymes. The results of such simulations are expressed in terms of transfer effic…