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。
The sonochemical destruction of binary mixtures of chloroform and carbon tetrachloride in aqueous solution at 30 kHz has been studied. The influences of initial concentration, bicarbonate/chloride, and acoustical intensity on the destruction rates have been observed. It was found that the destruction of the two compou…
This paper deals with the equations in a phase-field model with special terms coupling the heat equation and the equation of phase. A finer control of latent heat release together with a gradient coupling term in the phase equation are introduced as a consequence of an extensive numerical work with models of phase tra…
KOH-impregnated activated carbon (K-IAC) was studied as a NO x adsorbent. When adsorbing NO 2 /air to K-IAC, as the concentration increases, the removal efficiency relatively decreases because the function of the selective adsorption site for NO x is lost faster. By using AES/SAM and ToF-SIMS, we examined the chemical…
An aromatic poly(ether-ketone) derived from 4,4′−(hexafluoroisopropylidene)-diphenol and 4,4′-difluorobenzophenone has been sulfonated by using chlorosulfonic acid in 1,2-dichloroethane, in the presence of trimethylchlorosilane. The resulting modified polymers had different degrees of sulfonation depending on the reac…
Polyurethane (PU)/nitrile rubber (NBR) blends of different compositions were prepared by a combination of solution blending and mastication process. The thermal, mechanical, dynamic mechanical, and morphological properties indicated synergistic behavior of the two components. Incorporation of NBR in PU showed an incre…
A Mollisol catena in highly calcareous parent material under semiarid conditions of southern Iran was studied to determine the effects of water table depth and its fluctuations on the organic carbon content of mollic epipedons, genesis of subsurface horizons, and mineralogical variations in these horizons. The soils f…
Osmotic dehydration kinetics of potato slices and cubes was studied using sugar syrup of different concentrations and temperatures. The initial concentration of sucrose was varied from 30 to 65%, and temperature was varied from 22 to 80°C. The equilibrium coefficients for solids ranged from 0.84 to 1.55, and for water…
SUMMARY Coscinodiscus wailesii Gran et Angst is a large centric diatom (280‐500 µm diameter) from marine phytoplankton, characterized by a cylindrical frustule with flat valvar surface, two marginal rings of rimoportulae on the mantle, and two macrorimoportulae. Cells from cultured and natural populations collected in…
A study of the application of different membrane processes to nuclear technology has been conducted at the Institute of Nuclear Chemistry and Technology (INCT) for many years. One application of membrane methods involves the purification and concentration of liquid low- and medium-level radioactive wastes (LLLRWs and…
Nanocrystalline Fe-based spinels with composition Fe 3 - x Ti x O 4 are synthesized using soft chemistry. Two steps are involved: precipitation in an aqueous solution followed by thermal annealing under a reducing mixture of N 2 /H 2 /H 2 O gases. Fe-segregation is found inside stoichiometric particles when the powder…
Cryoprocessing is the process of cooling a material to extremely low temperatures to generate enhanced mechanical and physical properties. This article examines the effects of cryoprocessing on steel and some copper alloys. Research has shown that improvements occur in wear resistance, dimensional stability, electrica…
The X-ray crystal structure and magnetic properties of a molecular crystal consisting of 1,5-dimethyl-3-(2-pyridyl)-6-oxoverdazyl radical and hydroquinone (pyvd:hq) are presented. The structure contains a two-dimensional network of hydrogen bonds involving the hydroquinones and the pyridine ring of the pyvd radical. T…
The Langmuir-Blodgett (LB) technique has been used to obtain spatially resolved surface-enhanced resonance Raman scattering (SERRS) spectra of single dye molecules dispersed in the matrix of a fatty acid. The experimental results presented here mimic the original electrochemical surface-enhanced Raman scattering (SERS…
Mechanisms of electron phase separation in manganite-type oxide materials are analyzed using a simple Kondo-lattice model with intersite Coulomb repulsion between electrons. This model predicts the instability of magnetic (or charge) homogeneous ordering toward the formation of droplet structures (magnetic polarons) f…
By use of the analytic result for the Laplace transform of the radial distribution function for two large hard spheres dispersed in a fluid of the smaller hard spheres, simple equations for the film interaction energy and film disjoining pressure, due to the structural and depletion forces, are derived. The proposed e…
Organically modified transition-metal oxide clusters (OMTOCs) are structurally well-defined nanosized building blocks for the preparation of a new type of inorganic−organic hybrid materials. There are two principal methods to synthesize OMTOCs with polymerizable organic groups attached to their surface: the groups can…
Luminescent lanthanide chelates have unusual spectroscopic characteristics that make them valuable alternative probes to conventional organic fluorophores. However, fundamental parameters such as their quantum yield, and radiative and nonradiative decay rates have been difficult or impossible to measure. We have devel…
Zinc(II) and cadmium(II) coordination networks with p -pyridinecarboxylate bridging ligands, Zn(4-pyridylacrylate) 2 ( 3), [Cd(4-pyridylacrylate) 2 ]·H 2 O ( 4), Cd[4-(4-pyridyl)benzoate] 2 ·H 2 O (5), and [Zn 2 (μ-OH)(4-pyridylbenzoate) 3 ]·EtOH (6), have been synthesized under hydro(solvo)thermal conditions. Despite…
With increasing clock speed, the scaling of CMOS transistor geometries presents ever more severe challenges to the maintenance of operational circuits. As the gate area is reduced, the thickness of the gate dielectric must also be reduced in order to maintain sufficient capacitative control of the MOS channel for adeq…
The ultrasonic (longitudinal and transverse) velocities and the transport and magnetic properties of polycrystalline La 0.25 Ca 0.75 Mn 1- x Cr x O 3 ( x = 0, 0.03, 0.05, and 0.07) have been studied systematically. It was found that with increasing Cr content, the resistivity increases, the charge-ordering transition…