摘要:
A method for analyzing water or other liquid, in particular rain water, comprises the steps of providing a collector comprising at least first and second volumetric cells and a mechanism for causing water to flow selectively into the cells and for causing water to flow selectively from the cells. Water is caused to flow into a first one of the cells while it is prevented from flowing into the other one of the cells. The water collected in the first cell is caused to flow to a property determining cell when the first cell has been filled to a predetermined volume, and simultaneously water is prevented from flowing into the first cell while it is now permitted to flow into the second volumetric cell. The water collected in the second cell is then permitted to flow to a property determining cell when the second cell has been filled to a predetermined volume, and simultaneously the water is prevented from flowing to the second cell while it is now permitted to flow to the first cell.
摘要:
A layer of titanium carbosilicide Ti.sub.3 SiC.sub.2 on a silicon carbide surface polished for making a joint makes it possible to join silicon carbide bodies together in a hot pressing procedure and obtaining a joint strength comparable to the strength of the silicon carbide material. Such a layer on silicon carbide also makes possible brazed juoints with steel alloy or nickel based alloy parts. The layer may be applied directly by a powder dispersion in a volatile but viscous glycol or by sputtering or else the layer can be made in place from a powder mixture of components, especially TiC.sub.0,8 and Tisi.sub.2 (5:1) or a titanium layer of a thickness in the range of 1 to 3 .mu.m that reacts with the silicon carbide surface. When silicon carbide parts are joined together, the heating up to make the joint also serves to convert a titanium layer into titanium carbosilicide. When silicon carbide is to be joined with metal, a preliminary heating step is necessary to at first convert a powder mixture or a titanium layer on the silicon carbide surface to Ti.sub.3 SiC.sub.2. Alternatively a Ti.sub.3 SiC.sub. 2 surface layer can be formed by a sputtering process. The Ti.sub.3 SiC.sub.2 layer favors brazing of the metal part to the silicon carbide surface as treated. The heating requires reaching a temperature in the region from 1200.degree. to 1600.degree. C. for periods between a half hour to about three hours in the presence of a reducing protective gas.
摘要翻译:在用于制造接头的碳化硅表面上的碳化硅硅钛酸Ti3SiC2层可以在热压步骤中将碳化硅体连接在一起,并获得与碳化硅材料的强度相当的接合强度。 这种碳化硅层也可以用钢合金或镍基合金部件进行铜焊接。 该层可以通过粉末分散体直接施加在挥发性但粘稠的二醇中或通过溅射,或者可以从组分的粉末混合物,特别是TiC0,8和Tisi2(5:1)的粉末混合物或钛层 厚度在1至3μm的范围内,与碳化硅表面反应。 当碳化硅部分接合在一起时,加热至接合还用于将钛层转化为碳硅化钛。 当碳化硅与金属接合时,需要预加热步骤,以便首先将碳化硅表面上的粉末混合物或钛层转化为Ti 3 SiC 2。 或者,可以通过溅射工艺形成Ti 3 SiC 2表面层。 Ti3SiC2层有利于金属部分对被处理的碳化硅表面的钎焊。 加热需要在还原保护气体的存在下,在1200℃至1600℃的温度范围内达到半小时至约3小时。
摘要:
A magnetic field sensor comprises a stack of ferromagnetic layers advantageously separated by an intermediate layer of proper material and so arranged that the ferromagnetic layers are with one component in an antiparallel magnetization direction. The sensor is provided with terminals for passing an electric current through the stack and for detecting a voltage drop across the stack. The magnetic resistance change with such a stack is substantially greater than in systems which do not provide an antiparallel magnetization or do not have the intermediate layer.
摘要:
A method of and an apparatus for generating a control frequency in which two submultiples of a frequency standard are obtained which differ by unity in the respective frequency division and are mixed so that the contribution of a prior control frequency is reduced form period group to period group while the contribution of the new control frequency is increased from period group to period group. The system provides fine control of frequencies for, for example, driving synchronous motors without requiring excessively high frequency standard oscillators.
摘要:
A single stage methanization reactor and process are made to yield a product gas of high methane content as well as useful superheated steam without overheating the catalyst bed in which a synthesis gas containing, CO, CO.sub.2 and H.sub.2 is converted into product gas. A variety of dispositions of vaporizer and superheater portions of the cooling system in the catalyst bed, for which the temperature profiles of gas and coolant along the reactor length are shown and compared, illustrate the principles governing the cooling system for such a reactor. A small portion of the superheated steam is mixed with preheated synthesis gas for elimination of all or part of the carbon monoxide content before the synthesis gas is introduced into the methanization reactor.
摘要:
A method of making shaped bodies of silicon carbide, of graphite coated with silicon carbide or of a graphite-like material with a silicon carbide surface wherein a graphitic body is assembled from preformed parts in the desired shape and is immersed, under a chemically inert atmosphere, in a silicon melt and after penetration of the melt into gaps between abutting surfaces of the body and after reaction of the silicon with the graphite or the graphite-like material to form silicon carbide at the junctions, the body is removed from the melt and is cooled in a chemically inert atmosphere.
摘要:
A treating process for the separation of coated nuclear fuel particles from a graphitic matrix in which the nuclear fuel particles are embedded, which is employed in an installation for the conditioning of graphitic fuel elements of high-temperature nuclear reactors. The graphite which encompasses the nuclear fuel particles is conducted away through the action of a brush which isolates the nuclear fuel particles together with their coatings or the nuclear particles themselves, and wherein the nuclear fuel particles which are contained in the brushed product are then separated from the comminuted graphite. The nuclear fuel particles are worked out of the graphitic matrix through the action of the bristles of the brush which conduct the graphite away, but in which the coated nuclear fuel particles when they are contained within hard coatings or the nuclear fuel particles themselves, remain preserved. The worked out nuclear fuel particles are separated from the comminuted graphite fraction through the delivery of the brushed product into a sifter which is passed through by a separating gas, and in which the fine-grained fraction is conveyed away together with the gas stream.
摘要:
A process for the selective concentration of uranium from sea water through chemical accumulation onto a solid adsorption medium, which does not necessitate any H.sup.+ ions for regeneration, in particular onto titanium oxide hydrate and subsequent elution with a carbonate-containing eluent.
摘要:
An ionization chamber of reduced size, with an end window of a diameter preferably smaller than 3 cm is mounted on the end of a hand probe containing an amplifier, the output of which goes through a cable to an indicating device. One of a set of aperture diaphragms may be slipped over the end window to reduce the area of the window transparent to beta rays. In addition to the end window, slots in the cylindrical wall of the chamber increase the solid angle through which radiation may enter the chamber. The end window and the slotted walls of the chamber are covered with tissue-equivalent material for measurement of radiation exposure dose by the electrodes of the chamber and their associated amplifier and indicator. An alternative design with a conical chamber and conical inner electrode and a smaller window provides reliable measurement, even in inhomogeneous radiation fields without the necessity of using diaphragms.
摘要:
The invention is concerned with an electrochemical gas analyzer for determining the sulphur dioxide content of certain gases in particular, flue gases. The device comprises a measuring cell containing a measuring electrode for the determination of the depolarization current and further comprising an unpolarizable electrode in the same electrolyte. The gas input flow is utilized to cause a circulation of electrolyte containing the dissolved gas which moves in the space between the measuring and counter-electrode. The electrolyte is continuously renewed and the electrolyte leaving the cell is regeneratd and recycled. The sulphur dioxide dissolved in the electrolyte is removed outside the cell by treatment with air in the presence of activated charcoal.