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 A numerical method for calculation of the weight‐fraction distribution resulting from random crosslinking of polydisperse primary chains is suggested. The method is based on the numerical inverse Laplace transform of the weight‐fraction generating function given by the theory of branching processes. The appli…
Summary Two different parageneses for cebollite, a rare hydrated calcium aluminium silicate, are described, both differing from all previously reported occurrences. Cebollite forms concomitantly with natrolite from plagioclase in xenoliths of crustal material incorporated in kimberlite. The mineral also occurs as a la…
Abstract The magnetic susceptibilities for seven binary alloy systems (SnTe, SnSe, InTe, InSe, AgTe, AgSe and AgS) are measured as a funtion of temperature and composition. The diamagnetic susceptibilities of these systems fall rapidly on melting except for the InSe system, and decrease gradually with increasi…
Let <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper K left-bracket upper G right-bracket"> <mml:semantics> <mml:mrow> <mml:mi>K</mml:mi> <mml:mo stretchy="false">[</mml:mo> <mml:mi>G</mml:mi> <mml:mo stretchy="false">]</mml:mo> </mml:mrow> <mml:annota…
Abstract Flow crystallization experiments which utilized the Instron rheometer in conjunction with convergent dies were conducted for the purpose of producing high‐modulus poly(ethylene terephthalate) filaments directly from the melt. A temperature gradient was imposed on the lower extremity of the dies in an attempt…
A new explosive loading technique is applied to study the uniform plastic expansion and fracture initiation of 304 stainless steel cylinders. An annular layer of dry PETN high explosive is placed in contact with the inner diameter of the cylinder and surface-initiated with an array of etched copper bridgewires. This t…
Summary Both new species are retrograde or mesogene minerals that occur in tactites at the Christmas mine, Gila County, Arizona (USA). Gilalite is green, H = 2, D = 2.82. Biaxial (—), 2V small, α = 1.560, β = γ = 1.635. No single crystals found; strongest lines at 13.49 Å, (10); 10.97 (5); 7.786 (5). Analysis gave CuO…
Abstract When cellulose is phosphorylated with phosphorus oxychloride, the reactivity of the cellulose, as well as reaction time and temperature, influences the relative amounts of phosphorylated and chlorinated product formed. The swelling ability of the phosphorylated product is affected by the pretreatment received…
Abstract A wide compositional range of copolymers of 1‐cyclobutene carbonitrile (CBCN) and 1‐bicyclobutance carbonitrile (BBCN) with common vinyl monomers was prepared in order to study systematically the effect of cyclobutane carbonitrile ring incorporation on the glass transition temperature ( T g ). In general, the…
Abstract Durch Erhitzen inniger Gemenge von Na 2 O und NaNiO 2 erhalten wir erstmals Na 5 NiO 4 als stahlgraues Pulver [Na 2 O:NaNiO 2 = 2,2:1; 550°C, 2d, Korundbömbchen]. Auch die Einkristalle sehen so aus [analoge Ausgangsmischung, 650°C, 7d, Ag‐Bömbchen]. Na 5 NiO 4 ist isotyp mit Na 5 GaO 4 , orthorhombisch, Pbca,…
Ten vessels, candidates for the unperturbed storage of analytical calibration gases containing tritium, were investigated. Contamination of 99.7% tritium gas at STP by each container over one year was a function of vessel material and surface preparation. Cylinders of aluminum and stainless steel (SS) could restrict p…
The distribution of soil pH, extractable soil P, and AI was studied during 5 years of cropping in the soil profiles of a gibbsihumox soil at one P level (280 kg P/ha), three Si levels (0,830, and 1.660 kg Si/ha), and three pH levels (5.5, 6.0, and 6.5). The effect of residual Si on increased P availability was evident…
Young's modulus, the critical tensile stress, and the fracture stress of Stycast-1266 have been determined by the tension test as functions of temperature between room temperature and 2.2 K.
Abstract The radical polymerization of several vinyl monomers has been studied in the presence of cupric chloride. A termination reaction with Cu II species leads to the formation of Cu I species which can also participate significantly in termination with some, but not all, of the monomers studied. A theoretical trea…
Detailed studies of the dc and microwave conductivity and dielectric constant of the quasi-one-dimensional conductor, MEM(TCNQ) 2 for 4.2 K < T < 360 K are presented. Particular attention is paid to the strong first-order transition at 335 K where the conductivity jumps by about three orders of magnitude on heat…
Considerable experimental work has recently been reported on semiconductor-electrolyte interfaces in connection with the photoelectrolysis of water by illuminated n-type semiconductors. It is believed that surface states play an important role in charge transfer at the interface. In this paper the nature of that role…
The voltage distribution in a power transformer after a partial discharge has occurred is calculated. The results are compared with voltages, measured at the terminals of the transformer. A partial discharge prediction curve, based on the calculated capacitive distribution is constructed, by which the location of part…
Abstract The presence of low molecular weight molecules in a polymeric matrix often has a marked effect on material properties. Knowledge of specific penetrant distributions and component interactions is important for an elucidation of structure‐property relationships, plasticization phenomena, and any modification of…
A digital recorder has been developed for use in HV laboratories as a prospective replacement for conventional impulse oscilloscopes. The new apparatus has a sufficiently high time resolution to record the fastest microsecond impulses used for HV testing and also allows slower switching transients to be monitored.
Abstract The chemistry and technology of urethane elastomers has advanced rapidly since their inception in Europe in the late 1930'a and early 1940's. The earliest elastomers were Vulkollan, developed by I. G. Farbenindustrie (IGF) and Vulcaprene, developed by Imperial Chemical Industries (ICI). IGF developed a castin…