Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Water‐soluble polydepsipeptides with functionalized side‐chain groups, i.e., alternating copolymers, consisting of glycolic acid (Glc) and L ‐lysine ( L ‐Lys), L ‐aspartic acid ( L ‐Asp) or L ‐glutamic acid ( L ‐Glu) residues as α‐hydroxy acid and α‐amino acid residues, respectively, were synthesized, and the…
Two kinetically distinct types of oxygen atoms can be identified during the isothermal oxidation of CO on Pt(111) even though they all sit in identical sites at the start of the reaction. This is explained by a lowering in the reaction activation barrier with oxygen islanding.
Steel samples exposed to a 5% sodium chloride (NaCl) solution containing 0.5% acetic acid (CH3COOH) saturated with hydrogen sulfide (H2S), with and without imidazole (C3H4N2) as an inhibitor, were analyzed by x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS). The metal surface was cover…
A suggestion is advanced that the stable bubble clusters observed by Marston et al. [Bubble Dynamics and Interface Phenomena, edited by J. R. Blake et al. (Kluwer Academic, Dordrecht, 1994), pp. 343–353] in an ultrasonic field are due to the radiative interaction forces of the bubbles, which change from attraction to…
The crystal structure of bismuth compounds was established by Aurivillius and the general formula (Bi2O2)2+(Mn−1RnO3n+1)2− indicates that n (1 to 6) perovskite-like layers. M is a cation of 1, 2 or 3 valency and R is a smaller cation of 3, 4, 5 or 6 valency. The properties of a large number of compounds of this family…
Textile composites are known to have improved out-of-plane properties and impact resistance. However, detailed analysis of textile composites is very difficult to perform due to the geometric complexity. In the present study, a practical computational procedure based on a global/local finite element method was develop…
Dynamic observation of surface charge distribution is the main advantage of the electro-optical Pockels effect technique over the dust figure technique, the photographic Lichtenberg figure technique, and the static potential probe scanning method. This technique is demonstrated here to observe the surface charge distr…
Abstract Stricter emission control legislation for diesel use has been increasing interest in highly efficient wall‐flow particulate filters. The mathematical modeling of the filter regeneration process is indispensable in developing reliable and durable trap systems for various applications. Although modeling of wall…
Other| June 01, 1996 Thermochemistry of natural potassium sodium calcium leonhardite and its cation-exchanged forms Irina Kiseleva; Irina Kiseleva Princeton University, Department of Geological and Geophysical Sciences, Princeton, NJ, United States Search for other works by this author on: GSW Google Scholar Alexandra…
The crystal structure, thermal vibrations and electron density of L-arginine phosphate monohydrate (formally C 6 H 15 N 4 O 2 + .H 2 PO 4 − .H 2 O) have been analysed using 130 K single-crystal X-ray diffraction data to a resolution of (sin θ /λ) max = 1.20 Å −1 . A multipolar pseudo-atom density model was fitted agai…
The grain boundary structure and oxygen tracer diffusion in transparent yttrium aluminum garnet (YAG) ceramics varying from 2% excess of Y 2 O 3 to 0.5% excess of Al 2 O 3 were studied. The characterization of the specimens is as follows: (i) For the Y 2 O 3 ‐excess specimen, a second phase (yttrium aluminum perovskit…
Polycarboxylic acids have been used as crosslinking agents for cotton cellulose. In our previous research, we used Fourier transform infrared (FT-IR) spectroscopy to investigate the formation of five-membered cyclic anhydride intermediates on cotton fabric by different polycarboxylic acids. In this research, we found…
Abstract Free radical melt grafting of glycidyl methacrylate (GMA) onto polypropylene (PP) was studied. The extent of GMA grafting and the molecular weight of the functionalized PP copolymers were controlled by carefully manipulating various reaction factors, such as monomer concentration, initiator concentration, rea…
We developed a split Hopkinson bar technique to evaluate the performance of accelerometers that measure large amplitude pulses. A nondispersive stress pulse propagates in an aluminum bar and interacts with a tungsten or steel disk at the end of the bar. We measure stress at the aluminum bar-disk interface with a quart…
A polymerized complex technique was used to prepare high‐purity pyrochlore Y 2 Ti 2 O 7 powders at 750°C. Heating of a mixed solution of citric acid (CA), ethylene glycol (EG), and yttrium and titanium ions, with a molar ratio of CA:EG:Y:Ti = 5:20:1:1, at 130°C produced a yellowish transparent polymeric gel without an…
Packet-like space-charge behavior in polyethylene for cable insulation was studied by utilizing the laser-induced pressure-pulse technique. Space charge observation under various conditions showed that the charge packet was formed in the specimen doped with antioxidant, especially when the specimen is oxidized. Period…
The positive temperature coefficient of resistivity (PTCR) effect is directly measured in single grain boundaries in 0.1‐mol%‐Nb‐doped BaTiO 3 with 1 mm coarse grains. The PTCR effect largely depends on grain boundary structure. Random grain boundaries exhibit the PTCR effect as in polycrystalline samples, but the PTC…
This paper presents an indentation‐quench method to determine the resistance of ceramics to thermal cycling. The method defines a critical quench temperature difference, Δ T c , based on a criterion which includes a minimum amount of crack growth and a minimum fraction of growing cracks. The method is applied to three…
For the fungal metabolite citrinin, C 13 H 14 O 5 , the total experimental electron distribution ρ(r) and its Laplacian [Formula: see text] have been obtained from an extensive set (36 564 measurements) of single-crystal X-ray diffracted intensities at a temperature of 19 ± 2 K. Relevant steps in data collection and p…
Abstract A series of reduced-charge montmorillonites (RCMs) was prepared from Li-montmorillonite from Jelšový Potok (Slovakia) by heating at various temperatures (105–210°C for 24 h. The amount of fixed Li, 0.09–0.67 per O 20 (OH) 4 , increased with increasing temperature, confirming preparation of a set of samples of…