Materials Literature
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The equal channel angular extrusion (ECAE) process has been successfully used as an intense straining process to obtain ultrafine-grained metals. However, the process is essentially discontinuous and the productivity is quite low for industrial purposes. The authors have proposed a novel continuous shear deformation p…
A La-deficient manganite perovskite sample La0.54Ca0.32MnO3−δ was prepared by conventional solid-state reaction method. The Curie temperature TC is 272 K, about 10 K higher than that of La1−xCaxMnO3. A large magnetic entropy change has been observed and the maximum −ΔSM≈2.9 J/kg K appears at its Curie temperature upon…
Magnetization of Ni/sub 52/Mn/sub 24.4/Ga/sub 23.6/ and Ni/sub 52/Mn/sub 24.2/Ga/sub 23.8/ magnetic shape memory alloys was measured as a function of magnetic field up to 50 kOe at temperatures in the range 160-390 K. Anomalies of magnetic properties were observed not only at the temperature of martensitic transition…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTHeterofunctional Linking Agents for the Synthesis of Well-Defined Block Copolymers of Dimethylsiloxane and tert-Butyl Methacrylate or 2-VinylpyridineVasilios Bellas, Hermis Iatrou, Emmanuel N. Pitsinos, and Nikos HadjichristidisView…
By means of thermal desorption experiments, the partition equilibrium (partition coefficient, K) was analysed for six food aroma components (d-limonene, n-decane, ethyl caproate, phenylethanol, n-hexanol and hexanal) between three sealable pollymer films suitable for direct food contact (ultra-low density polyethylene…
Thin AgCl layers photocatalytically oxidize water to O2 under appropriate conditions. The photoactivity of AgCl extends from the UV into the visible light region in a process known as self-sensitization, which is due to the formation of silver during the photoreaction. This silver can be almost quantitatively reoxidiz…
The corrosion stability of Nd-Fe-B magnets in hot and humid climates was increased by about three orders of magnitude by simultaneous additions of Co, Cu, Al and Ga. Such magnets show almost no weight loss in a highly accelerated stress test at 130/spl deg/C (95% humidity) even after 200 days of exposure. In these mag…
(2001). Gene Structures and Catalytic Mechanisms of Microbial Enzymes Able to Blodegrade the Synthetic Solid Polymers Nylon and Polyester Polyurethaoe. Biotechnology and Genetic Engineering Reviews: Vol. 18, No. 1, pp. 125-147.
Four monomers containing azomethine-type spacers and 1-naphthyl groups at the extremities were synthesized by a coupling reaction between 1-naphthaldehyde with four different diamines. Full conjugated polyazomethines were obtained by oxidative polymerization of the monomers using anhydrous FeCl3. Both monomers and pol…
18S rDNA sequences of six Naviculaceae species [Amphora montana, Gomphonema parvulum, Eolimna minima (syn. Navicula minima), Eolimna subminuscula (syn. Navicula subminuscula), Navicula veneta and Phaeodactylum tricornutum] were determined in order to assess the monophyly of this important group of diatoms, to date not…
Abstract Zinc peroxide sols were prepared by the peptization of Zn(OH)2 using 1 mol/L of H2O2 aqueous solution at 348 K for 2 h. Firing the dried sol powder at 573 K for 2 h formed almost monodispersed ZnO nanoparticles whose average diameter was 19 nm.
The synthesis of new 6-deoxy-6-trialkylammonium cellulose derivatives obtained by nucleophilic displacement reactions of p-toluenesulfonyl celluloses with various amines is described. Water soluble cellulosics could be prepared using a N,N-dimethylformamide/water mixture as the reaction medium. Detailed studies concer…
This paper reports the development of a high sensitive CaSO4 : Dy thermostimulated luminescence (TLD) phosphor prepared by a new (N) inexpensive technique. Scanning electron microscope photographs reveal that its crystal morphology is quite different from the presently used CaSO4 : Dy (P). The TSL sensitivity of N (<7…
Kinetic information on soil P release is required to optimize P fertilizer use efficiency in agricultural production and develop guidelines for the disposal of P‐rich wastes onto the land. We determined the kinetics and energy changes of P release from tropical soils by mixed ion‐exchange resin. Phosphate release patt…
We report a “ship-in-a-bottle” synthesis where encapsulation of copper phthalocyanines (CuPc) into mesoporous channels of silicate MCM-41 was achieved by chemical vapor deposition (CVD) using 1,2-dicyanobenzene (DCNB). Silanol protons of MCM-41 were ion-exchanged with copper ions before CVD, and when the initial amoun…
A photoalignment technique has been utilized for fabricating zigzag-defect-free ferroelectric liquid crystal displays (FLCDs) using polyimide RN-1199, -1286, -1266 (Nissan Chem. Ind.) and adopting oblique irradiation of unpolarized UV light. A rubbing technique was also utilized for comparison. It is shown that among…
Aqueous alteration of five Ti-Zr-oxide-based ceramics containing elements simulating long-lived radionuclides was studied experimentally by leaching at 90 °C in deionized water for more than one year under conditions of high solid/liquid ratios. Four of these ceramics were synthesized by coldcrucible melting (two Synr…
Densification of exchange-spring magnet ribbons of Nd/sub x/Fe/sub 85-x/Co/sub 8/V/sub 1/B/sub 6/ (x=7-11) alloys has been investigated. The starting ribbon powders containing amorphous parts were prepared by melt spinning and were compacted by using a spark plasma sintering (SPS) method. SPS is a type of solid compre…
We report a new and cost-effective approach to prepare (15)N/(13)C labeled proteins for NMR using the Pichia pastoris expression system. Four protocols (P1 to P4) were defined and compared using recombinant Ovine interferon-tau (rOvIFN-tau). Our results demonstrate that in order to get full incorporation of (15)N and…
Different starch types (corn, rice, potato, corn amylose and corn amylopectin) were phosphorylated to varying degrees of substitution (DS) and tested both for acid hydrolysis during 3 h in a boiling bath and for enzymatic hydrolysis with a thermostable bacterial α-amylase (Bacillus licheniformis) for 30 min at 95 °C.…