摘要:
A method for studying a fluid by forming a stream of the fluid, exciting the stream by causing a laser beam to impinge thereon to produce secondary particles or quanta, and subjecting the resulting secondary particles or quanta to an analysis operation in an analyzer.
摘要:
The synthesis of a new class of macromolecules, the polycarbophosphazenes, is reported. When heated at 120.degree. C., the cyclocarbophosphazene N.sub.3 P.sub.2 CCl.sub.5 undergoes ring-opening polymerization to afford the high polymeric polycarbophosphazene [N.sub.3 P.sub.2 CCl.sub.5 ].sub.n. The latter functions as a reactive macromolecular intermediate and undergoes halogen replacement with sodium phenoxide or aniline to afford the hydrolytically stable derivatives [N.sub.3 P.sub.2 C(OPh).sub.5 ].sub.n and [N.sub.3 P.sub.2 C(NHPh).sub.5 ].sub.n.
摘要翻译:据报道,新一类大分子的合成,即聚碳磷腈。 当加热到120℃时,环磷酰腈N 3 P 2 CCl 5进行开环聚合,得到高聚合物多碳代膦腈[N 3 P 2 CCl 5] n。 后者用作反应性大分子中间体,并用苯酚盐或苯胺进行卤素取代,得到水解稳定的衍生物[N 3 P 2 C(OPh)5] n和[N 3 P 2 C(NHPh)5] n。
摘要:
In a method for producing selected mass spectra by directing electromagnetic radiation through an optical system onto sample material for vaporization, destruction, excitation and/ or ionization in the microrange, setting the expanse of the irradiation region of the sample by selection of the energy density of the radiation, and detecting the released particles, the radiation power density is varied for producing mass spectra having respectively different proportions of atom and molecule spectra.
摘要:
The present invention describes a motor designed for biodiesel compatibility comprising a particulate filter, a motor control unit being able to inject fuel to the engine in order to increase the exhaust temperature, and a lubricant composition, characterized in that the lubricant composition comprises at least one ester group containing polymer.
摘要:
Formulations have been developed to improve the solubility of corticosteroids such as fluticasone proprionate in a composition designed to achieve localized release of the drug in the small intestine and/or colon. In one embodiment, solid dispersions of fluticasone are prepared wherein the drug is blended with or coated onto a highly water soluble substrate such as nonpareil (sugar beads) then coated with a layer of polymer soluble in small intestinal fluid, then coated with an enteric coating. The inner polymer layer controls release of the drug, and the enteric coating, a pH sensitive polymer that is broken down in the ileum and colon, controls localized release of drug at various sites within the gastrointestinal tract. The multilayer pharmaceutical composition can be in the form of pellets, tablets compressed from pellets or pellets packed into capsules. The release profile of the drug can be manipulated by (1) altering size or shape (i.e., surface area) and solubility of the inert substrate; (2) the ratio of drug to polymer, the polymer composition and solubility, the porosity of the polymer; (3) the drug form (i.e., free base or salt, or which salt); and the thickness and/or surface area of the drug/polymer and/or enteric coating. In a preferred embodiment, the composition is administered orally. This may also be packaged to provide for an escalating or tapering dosage.
摘要:
The subject matter of the invention is a contact piece comprising a tungsten overlay soldered onto a support, wherein at least portions of the solder layer and optionally of the support are covered by a layer of a less noble metal than tungsten. The corrosion resistance of the tungsten overlay is considerably improved by the invention.