摘要:
The preassembled drainage element is made with a water permeable membrane sleeve that has slits placed in the peripheral portion of the sleeve that is to form the bottom of the drainage element. The aggregate is post-expandable after fabrication of the drainage element so as to widen the slits and cause the periphery of the drainage element to bulge in the sections containing the slits.
摘要:
The use of a cross-passage packing made of a metal fabric relates to a method in which an exchange of material and/or of heat is carried out between a liquid stream and a gas or vapour stream. The fabric packing (1) used is composed of vertical layers (11′, 12′) which consist of corrugated or pleated metal fabrics (11, 12) which form flow passages (13). The gas or vapour stream flows in the flow passages and the liquid stream flows on the metal fabric. The flow passages of adjacent layers cross in an open manner. The angle between crossing passages is lower than approximately 100°. In this method, the fabric packing is acted on by a relatively small liquid loading. The metal fabric forms a carrier for the liquid stream that is largely free of holes or other apertures. Values for the liquid loading are selected in accordance with the relationship L/a
摘要:
The invention concerns a component of predominantly organic material which affords overvoltage protection for electronic circuits, and a circuit by which a multiple of the threshold voltage of an individual component can be implemented.
摘要:
Carboxylic acid ester is produced by esterification of carboxylic acid and an alcohol in a catalytic reaction zone of a first column at a pressure not greater than ambient pressure. The resultant sump product is distilled in a reaction zone of a second column at a pressure greater than 1.5 bar to obtain a second liquid sump product containing carboxylic acid ester with an carboxylic acid content of less than 100 ppm by weight at a lower end of the column. Neutralization of the second liquid sump product with a base is not required.
摘要:
The static mixer is used for a curing mixed product of flowable components that react to form a solidifying mass on mixing. The mixer has mixing chambers that are arranged behind one another and next to one another along a tube axis. Each mixing chamber is delineated by longitudinal walls oriented in the direction of the tube axis and by transverse walls standing transversely to the tube axis. Openings in the longitudinal walls and in the floor of each mixing chamber establish inlets and outlets for the mixed product. The corner of at least some of the mixing chambers upstream of an outlet in the longitudinal walls is filled in to form a concave surface for directing the flowable components towards the outlet. The transverse wall at an inlet to at least some of the mixing chambers is also formed with a concave surface for directing the flowable components through the inlet into the mixing chamber.
摘要:
The tuft impact tester mounts a test probe in a suspended manner from a tripod arrangement via a gimbals mechanism so that the test probe is able to move along a vertical axis. The test probe is dropped from a predetermined height, the velocity of the test probe is measured prior to impact on a ground surface and the deceleration of the test probe caused by the ground surface is measured. The two values are used to determine the relative hardness of the ground surface.