摘要:
A process for the preparation of a hydroxyapatite, which is suitable as a tooth-cleaning substance, by precipitation from aqueous phosphoric acid and calcium hydroxide solution, in which a calcium-doped phosphoric acid solution is fed to an intensive mixer with a suspension of calcium hydroxide/oxide in a molar ratio of Ca:P=1.667 corresponding to the hydroxyapatite of and reacted there at precipitation temperatures of 60.degree.-100.degree. C., preferably 80.degree.-90.degree. C. and a pH of 4-8, preferably of 6.5-7.5. Also disclosed in a tooth-cleaning substance containing the hydroxyapatite.
摘要:
An apparatus for the preparation of alkali metal monofluorophosphates is disclosed. The apparatus includes a melting crucible of a platinum/rhodium alloy, devices for feeding the alkali metal fluoride and alkali metal metaphosphate or alkali metal polyphosphate raw materials into the upper part of the crucible, an outflow orifice for molten alkali metal fluorophosphate in the bottom of the crucible, a corresponding discharge orifice in the furnace, and a cooling arrangement, wherein a direct voltage is applied between the cooling arrangement and the melting crucible which is connected as the anode.
摘要:
The disclosure provides activated ammonium polyphosphate undergoing decomposition at an increased rate at temperatures within the range 300.degree. to 600.degree. C., the ammonium polyphosphate having been obtained by reacting it with melamine and/or dicyandiamide or their derivatives at 100.degree. to 200.degree. C.
摘要:
The invention relates to a process for converting water-soluble, condensed phosphates of the following general formula (I)M.sub.2 O(MPO.sub.3).sub.n (I)in which M stands for sodium, potassium or ammonium and n stands for a number between 4 and about 100, to granulate, wherein the pulverulent, water-soluble, condensed phosphate is thoroughly agitated and granulated in the presence of water and of a phosphate salt other than the condensed phosphate. More specifically, the condensed phosphate of general formula (I) or a mixture of the phosphate with an anhydrous or partially hydrated alkali metal phosphate is thoroughly agitated and granulated in the presence of water and an ammonium polyphosphate of the following general formula (II)H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 (II)in which n stands for an integral average value of 3 to 1000, m stands for a whole number of up to n+2, and the m/n-ratio is between about 1.0 and 1.67.
摘要:
A stent device delivery system and method of making. The stent device delivery system includes a stent device, an outer sheath overlaying the stent device in a radially compact, delivery configuration of the stent device, and a pull member. The outer sheath may include a first layer and a reinforcement layer that are laminated together, a portion of the pull member captured radially between the first layer and the reinforcement layer. At least a partial length of the captured portion of the pull member may be formed with a varying radial profile.
摘要:
Compounds can be used to act as inhibitors of enzymes having histone deacetylase activity for the medical therapy of conditions which predispose a person for the development of a disease, such as but not limited to cancer, inflammatory or metabolic diseases. Such conditions are linked to genetically inherited mutations of crucial genes which predispose a person with this condition to develop the disease phenotype. Thus, such compounds can be used for a suppressive therapeutic approach—the SUPPRESSION THERAPY—in order to inhibit or delay the onset or progression of the genetically predisposed disorder. Furthermore, a clinically used medicament can be manufactured for the SUPPRESSION THERAPY of such inherited predisposing conditions.
摘要:
The invention concerns an apparatus for transporting articles forming a mass flow from an input device to an output device, including an endless conveying element with a transport run and a return run, the conveying element being guided about at least two rollers designed as a driving and/or deflecting element, which is distinguished in that the transport run can be moved out of a throughflow position in which the transport run exhibits its maximum length, into a discharge position in which the transport run is shortened from the maximum length, and vice versa. Furthermore, the invention concerns an apparatus for filling a subsequent apparatus with rod-shaped articles, in particular a packer, including a filling head with a feed element for transporting articles forming a mass flow, the feed element leading into a chute in the region of an orifice and comprising a lower conveying means which includes two transport elements arranged one behind the other, which is distinguished in that the rear transport element of the lower conveying means, in the main direction of conveying, is designed as an apparatus according to claim 1. Furthermore, the invention concerns a corresponding method.
摘要:
A corona shield for an electrical machine includes a non-woven fabric of fibers or a fabric of threads, wherein the fibers or threads contain electrically conductive inorganic material.
摘要:
The invention relates to a multipath propagation delay determining means (STU, FIGS. 6, 7) for determining a power delay spectrum (DPS) of a CDMA signal transmission between a CDMA base station (BS) and a CDMA mobile station (MS) on a plurality of propagation paths (P1, P2) within a cell (CL) of a CDMA communication system, comprising an A/D conversion means (A/D) for converting an analog CDMA multipath signal (S1, S2) received from at least one antenna (Ant1, Ant2) within said cell (CL) into a digital CDMA multipath signal (S1, S2) consisting of consecutive radio frames (RF1 . . . RFn) including consecutive time slots (TS1 . . . TSm) with complex pilot symbols (PSi) and data symbols (Pdi), a demultiplexing means (PI-DEMUX) for extracting complex pilot symbols (PSi) and data symbols (PDi) from at least two consecutive time slots (TSk−1, TSk, TSk+1) of each radio frame (RFn) and for storing them consecutively in a memory means (BUF) thereof; and a searching means (S1 . . . SL) for determining a power delay profile (DPS, DPS1, DPS2, FIG. 14) of said each antenna (Ant.1, Ant.2) on the basis of said extracted and stored complex pilot symbols and said data symbols (PSi, PDi).
摘要:
A process for purification by multistage countercurrent extraction of wet-process phosphoric acid includes the steps of (a) preparing an aqueous phosphoric acid by decomposition of crude phosphates with sulfuric acid and prepurification thereof; (b) providing an organic solvent mixture consisting of one of (A) a water immiscible solvent and a fully water-miscible solvent or (B) a partially water-miscible solvent and a fully water-miscible solvent; (c) extracting water from the acid by contacting with the solvent mixture in a volumetric ratio of acid to solvent mixture of 1:1 to 1:10 at a temperature of 5 to 90° C.; (d) recovering the fully water-miscible solvent by distillation and washing; (e) recycling the fully water-miscible solvent to step (b) to provide a recycled solvent mixture; and (f) repeating steps (c), (d) and (e) with the recycled solvent mixture to provide a phosphoric acid having a preselected degree of purity.