17,880 Result(s)
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Article
Some general principles of dynamic instability of solid bodies
Ce travail représente une étude de l'équilibre des corps solides, avec un intérêt special accordé aux corps élastiques et à ceux de Voigt-Kelvin. Les efforts appliqués peuvent avoir des composants non conserva...
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Variational method in the stability analysis of nonconservative problems
Das Stabilitätsproblem eines Voigt-Kelvin-Körpers, welcher nichtkonservativen und gyroskopischen Kräften unterworfen ist, wird — ähnlich der bekannten klassischen Methode — als Variationsaufgabe formuliert. Zw...
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Biological activities of some 5-substituted N,N-dimethyltryptamines, α-methyltryptamines, and gramines
Three series of derivatives of N,N-dimethyltryptamine, α-methyltryptamine and gramine bearing substituents of varying electronic nature on the C-5 position were tested for acute toxicity, effect on barbiturate...
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Non-crystallinity and polymorphism in elemental solids
THIS paper shows a universal correlation of the non-crystalline state with polymorphism in elemental solids. This is demonstrated by a map constructed on a plot of the number of polymorphic forms (NPF) against...
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Phenylpropanoids in chlorination
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A microstructural investigation of the bcc to A15 phase transition in sputter-deposited Nb3Al superconductors
The bcc to A15 phase transition in sputter-deposited Nb3Al (Cb3Al) superconductors was studied using transmission electron microscopy. Four distinct microstructures were observed for the sputter-deposited and iso...
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Article
A vitreous Kr·2SiO2
THERE are many studies1–7 of the presence of inert gases in glasses. Because they have no electron affinity and high ionisation potentials (12 eV for Xe to 24 eV for He) the solubility of inert gases in glasses h...
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Short-range structure for amorphous intertransition metal alloys
Amorphous intertransition metal alloys may be a special class of the glassy state whose short-range structure is random tetrahedral close packing of soft atoms similar to those in the crystalline counterparts....
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Thermal stability data of noncrystalline elemental solids
Amorphous solids crystallize, on heating, at a temperature,T x, ExperimentalT x data are compiled for amorphous elemental solids.
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Ammonium bicarbonate used as a nitrogen fertilizer in China
This article reports a modified process for the production of synthetic ammonia, in which CO2 in the converted water gas is removed by the synthesized ammonia itself, and the precipitated NH4HCO3 serves as the fi...
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Solar energy conversion by chloroplast photoelectrochemical cells
Solar energy can be captured by photochemical or photoelectric processes in which a gradient of chemical potential can be generated using photochemical redox reactions. Photosynthesis is the most efficient sys...
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Thermal stability data of amorphous binary alloys
Data on the thermal stability of amorphous (glassy) binary alloys are compiled. Where available, alloy preparation method, crystallization temperature and method of measurement of crystallization temperature a...
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Article
Characteristics of the fate and efficiency of nitrogen in supergranules of urea
Using15 N tracer technique, the fate and efficiency of nitrogen in supergranules of urea as compared with that in powdered urea were studied in rice fields. The results obtained show that supergranules of urea we...
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Refractory-metal stabilized amorphous stainless steel
Commercial stainless steel alloys have been made into amorphous, or glassy, states by adding nearly 10 at % of refractory metals, such as W or Ti, via high-rate sputter deposition. The formation of these stabl...
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Application of the theory of branching of solutions of nonlinear equations in the estimation of pole perturbance of linear closed-loop systems
When the state and input matrices of a multivariable linear time-invariant system are perturbed, the problem of the estimation of pole perturbance of closed-loop system is considered by making use of the theor...
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Carbon fibre-reinforced silicon nitride composite
The processing of silicon nitride reinforced with carbon fibre was studied. The problems of physical and chemical incompatibility between carbon fibre and the silicon nitride matrix were solved by addition of ...
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Dam** feature of dynamic problem and “velocity” finite element method
In order to reduce the amount of computation and storage of dynamic problem, this paper based on [16] is intended to analyse dam** feature, and study the relations among the dam** and the material as well ...
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Properties of polyethylene-propylene blends
High density polyethylene-isotactic polypropylene blends have been analysed using mechanical tensile tests at temperatures (T) ranging from25 up to 150° C and at crosshead speeds ranging from 0.01 to500 mm min−1....
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Effect of low oxygen and high carbon dioxide on the levels of ethylene and 1-aminocyclopropane-1-carboxylic acid in ripening apple fruits
The association of the level of ACC and the ethylene concentration in ripening apple fruit (Malus sylvestris Mill, var. Ben Davis) was studied. Preclimacteric apple contained small amounts of ACC and ethylene. Wi...
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An immobile nucleic acid junction constructed from oligonucleotides
Base-paired DNA duplexes involving oligonucleotide model systems have provided the major source of detailed structural and dynamic information about double helical structure1. Triple- and quadruple-branched ‘junc...
