Guide for Mixing and Placing Sulfur Concrete in Construction
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Structure and reactivity of zinc–chromium mixed oxides. Part 2.—Study of the surface reactivity by temperature-programmed desorption of methanol
The interaction of methanol with zinc–chromium mixed oxides has been studied by temperature-programmed desorption (t.p.d.) in the range 430–770 K. Both the amount of methanol adsorbed and the amount of desorbed species in t.p.d. experiments, which can be taken as an indicator of the number of active sites responsible…
Stress Analysis Concepts for Adhesive Bonding of Aircraft Primary Structure
This paper is a summation of the author's work towards creating valid stress analysis of adhesively bonded structure. The context is airframe construction, specifically metal to metal bonds, and excluding sandwich structure. A model joint is presented as being a basic representation of the problem. A linear formula is…
EFFECT OF MICROWAVE HEATING ON ADHESION AND MOISTURE DAMAGE OF ASPHALT MIXTURES
Microwave energy has been demonstrated to be capable of heating pavements rapidly, uniformly, and to depths of up to 5 in. without overheating the surface. Microwave treatment of asphalt mixtures is believed to have the potential of improving asphalt adhesion to aggregate. Presented in this paper is the work that was…
Galvanic Corrosion
Description Tutorial manual on galvanic corrosion; includes articles from industry, introductory and theoretical articles. Twenty-three papers divided into five sections: theory; computer prediction; testing and control; environments; and industries.
The AC and DC performance of polymeric insulating materials under accelerated aging in a fog chamber
The materials evaluated in fog produced from low (250 mu s/cm) and high (1000 mu s/cm) conductivity water include cylindrical rod samples of high-temperature-vulcanized silicone rubber and ethylene-propylene-diene monomer rubber (EPDM) containing various amounts of either alumina trihydrate or silica fillers, or both.…
Wetting of fibers : theory and experiments
We first present a digest of a previous theoretical study of one of us (F. B.) about the static aspects of wetting of thin fibers. This study includes the effects of long range Van der Waals interactions. Two points merit special attention : (i) the threshold value Sc of the spreading parameter for complete wetting is…
Backbone conformation study of a side chain polyacrylate through a re-entrant polymorphism
The backbone conformation of a liquid crystalline side-chain polyacrylate was studied by Small Angle Neutron Scattering (SANS) in the isotropic, nematic, smectic A and re-entrant nematic phases. A transition from an oblate backbone conformation (observed in the nematic and in the smectic A phases) to a prolate conform…
Focused-ion-beam milling, scanning-electron microscopy, and focused-droplet deposition in a single microcircuit surgery tool
Inspection by microtomography of active devices, tuning, and repair of III–V microstructures and microcircuits have been performed using the capabilities of combined scanning-electron microscope (SEM) and low-voltage (0.5–20 kV) focused-ion-beam (FIB), or focused-droplet beam (FDB) system. In this instrument, the ion…
Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres
Third in a series that addresses the design and operation of oxygen systems. The goal of the series is to build a reference for both the skilled and the uninitiated in the concepts and practices for the design and maintenance of all types of oxygen system
Low-frequency eddy-current loss estimation in long conductors by using the moment of inertia of cross sections
A simple method is presented to estimate low-frequency eddy-current losses in long nonmagnetic conductors of uniform cross section when subjected to axial or transverse magnetic field. The method involves calculation of the moment of inertia of the conductor cross section. In the case of transverse fields, the relatio…
Studies of reduction with the sodium borohydride-transition metal boride system. I. Reduction of nitro and the other functional groups with the sodium borohydride-nickel boride system.
Aromatic nitro, azoxy, azo and hydrazo compounds were reduced with the sodium borohydride-nickel boride system to the corresponding reduction products under mild conditions.
Soft X-ray Dosimetry and RBE for Survival of Chinese Hamster V79 Cells
Dosimetry and biological effects of 40 and 50 keV low-energy X-rays generated by a SOFTEX Model CMBW-2 apparatus were studied. Doses were measured using a thin-window parallel-plate ionization chamber; beam quality was assessed using aluminum absorbers; exposure rates per unit current were determined according to the…
Photoresponsive crown ethers. Part 20. Reversible photocontrol of association–dissociation equilibria between azobis(benzo-18-crown-6) and diammonium cations
The solution properties of complexes formed from azo(benzo-18-crown-6)(1) and polymethylene-α,ω-diammonio cations [H3N+(CH2)nNH3+(2)] have been evaluated through measurements of average molecular weights, viscosity, n.m.r. spectra, and electrical conductance. The trans compound (1) and (2; n= 6) forms a polymeric comp…
Dicopper(II) complexes of a binucleating N4 macrocycle containing mono- and di-atomic bridges; magnetic interactions mediated by alkoxo- and diaza-bridging ligands. Crystal structures of [Cu2(L1)(pz)2][ClO4]2, [Cu2(L1)(OEt)2(NCS)2], and [Cu2(L1)(OMe)2(MeCN)2][BPh4]2
Dicopper(II) complexes of 20-membered N4 binucleating macrocycles L1–L3 derived by a cyclic [2 + 2] condensation of diformylthiophene or diformylfuran with the appropriate diamine have been synthesised and characterised by analytical, spectroscopic, magnetic, and X-ray diffraction methods. A pair of bridging ligands,…
A study of the hydration and thermodynamics of warm-water and cold-water fish collagens
The hydrated volumes, Vh, of collagens extracted from various fish species were calculated by using the Simha-Einstein equation, and it was found that the hydration of warm-water fish collagen is greater than that of cold-water fish collagen (halibut). Although the intrinsic viscosities of warm-water fish (bigeye-tuna…
Polyolefine oxidation: Rates and products
Abstract The mechanism of the thermal oxidation of polyethylene and polypropylene is discussed, based on the observations concerning the oxidation products. The reactions leading to the active radical and molecular intermediate products are given and the differences in the number and structure of the intermediates for…
The spreading of macroscopic droplets
Some experimental results on the macroscopic spreading of hanging and sessile drops on smooth surfaces are presented. The results for sessile drops nicely corroborate the main aspects of the spreading theory of de Gennes and Joanny. However, it is shown that one assumption of the theory, namely the retainment of a sel…
Rhombohedral Phase in Y 2 O 3 ‐Partially‐Stabilized ZrO 2
Tetragonal‐to‐rhombohedral stress‐induced phase transformation was studied by X‐ray diffraction on the ground surfaces of tetragonal zirconia polycrystals and partially stabilized zirconia containing 2.0 to 5.0 mol% Y 2 O 3 prepared by hot isostatic pressing. The rhombohedral phase increased with Y 2 O 3 content and a…
An electrostatic approach to the structure of hydrated lanthanoid ions. [M(OH2)9]3+versus[M(OH2)8]3+
The bond energies of ennea- and octa-aqua-coordinated polyhedra of lanthanoid ions have been calculated on the electrostatic model. Sums of coordination bond energies and Born hydration enthalpies of the aqua complexes predict an exclusive stabilization of the enneahydrate regardless of whether the central metal ion i…