Lariat ether bola-amphiphiles: formation of crown ether based bola-amphisomes
The first crown ether-based bola-amphiphiles are prepared and are shown to aggregate into a previously unknown type of niosome.
Materials Literature
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Radiation-Induced Segregation in 20Cr/25Ni/Nb Stainless Steel
Intergranular corrosion of irradiated austenitic steels has been attributed to compositional changes produced by radiation-induced segregation at grain boundaries, and the effect has been investigated for the 20Cr/25Ni/Nb stainless steel employed as fuel cladding in advanced gas-cooled reactors. Analytical electron mi…
Formation process of kaolinite from the amorphous mixture of silica and alumina
The formation process of kaolinite from the amorphous mixture of silica and alumina by hydrothermal reaction was studied by XRD, IR, DTA-TG, TEM, and high-resolution solid state 29 Si- and 27 Al-MAS/NMR. The amorphous mixture of the starting material prepared with commercially available silica-sol and alumina-sol was…
Reduction of Platinum Corrosion in Molten Glass
In order to ensure the high quality necessary for use in scientific instruments, most high-technology optical glasses are melted in platinum containers. In general, this noble metal has excellent corrosion and erosion resistance, as well as low solubility, when in contact with molten glass. Therefore the dangers of di…
Wear Testing of Advanced Materials
Description STP 1167 addresses special problems engineers encounter when developing and using wear tests for ceramics and other advanced materials.
Performance of Protective Clothing: Fourth Volume
Description 80 peer-reviewed papers address these issues: • Hazards and Methods (including aerosols, physical resistance, biological, chemical, pesticides, and thermal and heat) • Field tests, New tests, Evaluations, Design, Physiological, Performance (including field tests, new and improved tests, evaluations, physio…
Development of 800 kV gas-insulated switchgear
An 800 kV gas-insulated switchgear, with a capacity level recognized as the largest in the world, was developed as the first development of UHV gas-insulated switchgear, and good results were obtained in the type tests for this switchgear. With the gas circuit breaker and the disconnector used in this gas-insulated sw…
A Mathematical Model for the Influence of Deep‐Level Electronic States on Photoelectrochemical Impedance Spectroscopy: II . Assessment of Characterization Methods Based on Mott‐Schottky Theory
The impact of the assumptions inherent in using the Mott‐Schottky theory to identify deep‐level electronic states in semiconductors was assessed by comparison to the results of a less restrictive mathematical model. The model, developed in another paper, treated the transport and recombination reactions involving elec…
Reactivation of poly(3-methylthiophene) following overoxidation in the presence of chloride
Poly(3-methylthiophene) films made electrochemically inactive by overoxidation in the presence of Cl– can be reactivated both electrochemically and chemically to produce a partially chlorinated conducting polymer.
Poly(rA) ioinos poly(rG) poly(rC) to form a tripie helix
Poly(rA) binds poly(rG).poly(rC) to form a triple helix. Evidence for this structure includes ultraviolet absorbance mixing curves and melting curves, and circular dichroism spectroscopy. The formation of the triple helix depends on the length of the poly(rC) strand. Triple helix forms when the average length is aroun…
Microstructured fluids: Structure, diffusion and rheology of colloidal dispersions
The behavior of concentrated Brownian suspensions in a linear shear flow is studied numerically. Particle trajectories are calculated by Stokesian dynamics, a molecular‐dynamics‐like method that accurately represents the suspension hydrodynamics, including both many‐body interactions and lubrication. The simulations a…
A Mathematical Model for Chemical Vapor Infiltration with Volume Heating
A detailed mathematical model is presented to investigate the chemical vapor infiltration (CVI) of fiber‐reinforced ceramic composites with a volume‐heating source. Volume heating may be achieved by using microwave power or radio frequency (RF) induction in the case of conductive substrates. The analysis includes a se…
X-Ray investigations in low-molecular-weight glassy mesophases
Pure low-molecular-weight mesogenic compounds as well as mesogenic mixtures, able to form glass phases above room temperature, have been investigated by microscopy, calorimetry and X-ray scattering. Indications for two types of short-range order (SRO) in the glassy state have been found. Diffuse low-angle scattering m…
Formulation of a universal electron probe microanalysis correction method
Abstract A new correction method for obtaining quantitative electron probe microanalysis results is described. It utilizes data provided by Monte Carlo simulations and tracer measurements to obtain a detailed picture of the way in which the x‐ray emission process is influenced by the relevant experimental parameters.…
Optic properties and EPR spectra of PbTiO3:Mn crystals
The crystals PbTiO3:Mn have been obtained. The influence of Mn dopant on light absorption, electric conductivity, dielectric permittivity was observed. The defect centers of Mn24, Mn4+, Vo, Fe3+-Vo were determined with EPR test.
Analysis of partial discharge pulse distribution along transformer windings using digital filtering techniques
The capacitive network often used for the calculation of initial voltage distribution along a transformer winding can be in error for steep impulses. As such pulses are produced by partial discharges (PDs) the application of the concept could contribute to inaccuracies in methods developed for the location of PDs in w…
Molecular Mechanics Studies of Molybdenum Disulphide Catalysts Parameterisation of Molybdenum and Sulphur
A method for the parameterisation of molybdenum disulphide is presented which reproduces the crystal structure accurately. The method involves calculating parameters such that there is no net force contribution from any individual term of the potential on any atom. Ideal bond lengths and bond angles are taken from the…
Electron Microscopy Study of Type II Twins in γ<SUB>1</SUB>′ Cu–Al–Ni Martensite
The lattice invariant shear in the β1→γ1′ martensitic transformation in a Cu–Al–Ni alloy is confirmed to be 〈111〉γ1′ Type II twinning by X-ray diffraction and two-surface analysis using single crystals. However, Type II twins have not been observed by electron microscopy in the past. To resolve this conflict, the twin…
Modeling the shielding effectiveness of metallized fabrics
A semi-empirical model describing the plane wave shielding effectiveness (SE) of metallized fabrics, both woven and non-woven, has been developed. The model incorporates the plane wave shielding theory of homogeneous metal foils, meshes, and thick perforated metal panels into a formulation for predicting the shielding…
A User's Guide to Principal Components.
3. A User's Guide to Principal Components. By J. E. Jackson. ISBN 0 471 62267 2. Wiley, New York, 1991. xviii + 570pp. £55.15.