Materials Literature
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We investigate a two-dimensional Lennard-Jones mixture with the interaction parameters chosen so as to favor configurations where the large atoms form squares and equilateral triangles. Many such configurations are possible which by our choice of interactions are nearly degenerate in energy. It is hypothesized that a…
Sinking and sedimentation rates of a natural phytoplankton community were simultaneously measured during the course of a diatom winterkpring bloom in a 13m3 experimental mesocosm. Sinking rate was determined directly in settling columns and was calculated from sediment trap catches. The 2 methods yielded significantly…
A theoretical discussion of a new method of measuring thermal properties, particularly the thermal handle of textilees, is followed by the description of a new Alambeta device and sensor developed for the purpose.
Authigenic illites and chlorites from elastic reservoirs, offshore Norway, have been studied by analytical transmission electron microscopy (ATEM). Present-day reservoir conditions range from 1600 m burial depth and 70~ to 4400 m and 160~ The reservoir units have experienced continuous subsidence since early Cretaceou…
Magnetic phase transitions of molecular materials are currently of large interest, particularly those leading to a permanent magnetic moment. Several different approaches are used in order to obtain three-dimensional order, and among them one particularly interesting is that of assembling in lattice spins with largely…
—The primary goal of surface modification of fluoropolymers is to improve adhesion to these low surface energy materials. Both classical methods and newer processes have been used as a means to this end. Various methods of modifying fluoropolymer surfaces include wet chemical etching, electrochemical reduction, grafti…
The author introduces a general criterion for leader inception of phase-to-ground air insulation under positive critical switching impulses. This criterion established the correspondence between continuous leader initiation in the vicinity of the highly stressed electrode and conditions prevailing later at the instant…
We study the equilibrium statistics of flexible neutral polymer chains attached by one end onto a flat interface (the polymer « brush »). We account for the finite extensibility of the polymers, adopting a form for the free energy of a stretched chain that diverges as its fully-extended length is approached. Adopting…
Procedures for designing a tunable liquid crystal (LC) electrooptic filter are illustrated. Selective filtering of one of the two mixed laser lines is used as an example for calculation. It is demonstrated that a LC filter can select a desired beam to pass while rejecting the other one, or vice versa, by switching the…
Size measurements of dispersed rat bone crystals show that with age a greater proportion exceeds 400 A in length. The surface fractures of more heavily mineralized bones tend to be smooth and stepped, whereas those of less mineralized bones are fibrous. These observations combined with information reported elsewhere o…
Progress in the development of nonceramic transmission line insulator technology is reviewed. The results of a survey of utilities in the United States are presented to indicate the range of applications, distribution by voltage class, appraisal of performance, and failure modes. It was found that the tracking, erosio…
Data from experiments on animals and humans have supported the development of computer models that predict human response to various combinations of the three main heat stress factors work, clothing, and environment. However, recent application of such models shows that the validity of their output is limited in part…
An advanced Zircaloy cladding containing niobium has been developed and tested extensively both in long-term out-of-pile autoclave exposures and through high burnup irradiation in a pressurized water reactor (PWR) environment. Tubing of zirconium-based binary alloys containing 0.5, 1.0, and 2.5% niobium, and a quatern…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDramatic effect of the specific solvation on the reactivity of quaternary ammonium fluorides and poly(hydrogen fluorides), (HF)n.cntdot.F-, in media of low polarityDario Landini, Angelamaria Maia, and Alessandro RampoldiCite this: J. Org. Chem. 1989, 54, 2, 328–332Publicatio…
Infinite periodic minimal surfaces are now being introduced to describe some complex structures with large cells, formed by inorganic and organic materials, which can be considered as crystals of surfaces or films. Among them are the spectacular cubic crystalline structures built by amphiphilic molecules in the presen…
The reaction of one‐to‐one molar carbon/silica powder mixtures was studied using simultaneous thermogravimetric analysis and mass spectroscopy with crystalline and amorphous silica. Reaction proceeded via a two‐stage path in which there are at least three identifiable competing global reactions. During the first stage…
Journal URL: http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=%20PC/PC-00a&sessionid=85597106; http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=journal&sessionid=85597106
A methodological review of the production of microspheres/microcapsules by interfacial polycondensation is presented and the mechanisms of particle and capsule formation are discussed. Procedures for interfacial polycondensation employed for the preparation of microspheres/microcapsules involve the polycondensation of…
Gd(hfac),NITEt (hfac = hexafluoroacetylacetonate, NITEt = 2-ethyl-4,4,5,5-tetramethyl-4,5-dihydro-lH-imidazolyl-l-oxyl 3-oxide) crystallizes in the monoclinic space group P21/n with cell parameters a = 2006.4 (4) pm, b = 1706.4 (4) pm, c = 2267.3 (2) pm, fi = 113.82 (1)O, V = 7101.3 X lo6 pm3, Z = 4, and R, = 0.076. T…
Measurements of the complex permittivity of polyimide (PI) films in a temperature range from 80 to 325 K are reported. Two loss peaks show the pronounced influence of absorbed water on this part of the relaxation spectrum. Since these loss peaks can be removed by drying the film, it is concluded that the water dipole…