摘要:
Zinc/phosphorus-free antiwear agents and antioxidants are provided by reaction products of 2,5-dimercapto-1,3,4-thiadiazole with mercaptans and thionyl chloride.
摘要:
Water soluble lubricant compositions comprising alkanolamine and organic acid are improved by employing as the organic acid a partial acid amide of a dicarboxylic acid, such as mono-PRIMENE 81 R amide of succinic acid, mono-di-2-ethylhexylamide of maleic acid, mono-di-2-ethylhexylamide of methyltetrahydrophthalic acid and mono-di-2-ethylhexylamide of methylhexahydrophthalic acid as the organic acid.
摘要:
Improved water soluble lubricant compositions are provided by incorporating therein amides derived from alkylamines and succinic, tetrahydrophthalic or tetrahydrofuran tetracarboxylic acids.
摘要:
Compounds having biocidal and antirust properties which constitute the reaction product of (a) a benzotriazole compound having the formula: ##STR1## wherein R is hydrogen or an alkyl group containing from about 1 to about 6 carbon atoms and (b) a water soluble base, characterized by a basicity greater than that of said benzotriazole compound, such as an alkali metal hydroxide or a hydrocarbyl amine. Lubricant compositions are also provided containing biocidal and antirust amounts of the aforenoted reaction product.
摘要:
A method for providing a string of tubing for installation in a well, which method comprises installing a string of tubing within a wellbore, wherein the string of tubing comprises a plurality of elongated tubular members and at least one cylindrical liner comprising a polymer; at least one of the plurality of elongated tubular members includes a cylindrical wall having an inner surface and an outer surface; the cylindrical liner has an outer surface that is disposed in adjacent contact with the inner surface of the elongated tubular member; the cylindrical liner has an inner surface that defines the tubing borehole through which fluids are capable of flowing; and the cylindrical liner has a scrolled configuration.
摘要:
The instant invention provides a method for producing RNA enzymatically in a semi-batch or continuous-flow bioreactor using a DNA template immobilized to a solid support through a linkage having a single-stranded overhang extending from a noncoding strand. The coding strand remains dissociable from the immobilized noncoding strand. The immobilized RNA template is reused in at least sixteen rounds of transcription reaction. The coding strand can be replaced with a fresh DNA strand encoding the same or a different RNA.
摘要:
A fast-acting and portable diagnostic kit for detecting diamines in biological fluids is in the form of a diamine oxidase and a chromogenic system to detect the presence of hydrogen peroxide resulting from oxidation of such diamines. The kit may especially be used to detect cadaverine or putrescine or a mixture thereof, for example in a vaginal secretion, in order to detect Gardnerella-related bacterial vaginosis.
摘要:
A lubricant concentrate for use in metal processing comprises a sulfur compound such as a sulfurized olefin or sulfurized mineral oil and an ester prepared from a fatty acid having 12 to 40 carbon atoms or the dimer thereof or a polyalkenylsuccinic acid or anhydride and a hydroxyl-containing amine.
摘要:
Lubricating oils, which in aqueous media are useful hydraulic fluids and the like, contain a metal hydrocarbyl dithiophosphate and a system of other additives which solubilize the dithiophosphates in the aqueous oils.
摘要:
A process and an apparatus using an inverse discrete Fourier transform forynthesis of complex waveforms that have one or more sinusoidal components of arbitrary frequency, amplitude and phase. The component sinusoids are formed in segments of a predetermined period and modulated according to a preselected function. The modulation characteristic is compensated for by overlapped concatenation of adjacent segments.