摘要:
A microwave generator has at least one resonator with two mutually opposite resonator electrodes which are separated by a spark gap. The spark gap breaks down when a high-voltage is applied. The resonator electrodes are designed in the area of the spark gap such that they result in a two-dimensional or three-dimensional section with a substantially constant, minimum electrode separation.
摘要:
The invention relates to a reactive composition containing A) an isocyanate-containing compound, B) a polyol, C) an organic tin or bismuth compound, D) a thiol group-containing compound or a polyphenol which is able to react with an isocyanate group in the presence of a tertiary amine as activator and with adjacent hydroxyl groups and E) a hydrolyzable halogen compound, wherein the molar ratio SH and/or OH:metal is 2 to 500 and the molar ratio halogen/metal is 0.05 to 10.
摘要:
A microwave generator has a resonator with two mutually spaced resonator electrodes. The resonator electrodes provide a spark gap device which breaks down upon the application of a firing voltage between them. The spark gap device has at least two parallel-connected spark gaps.
摘要:
High-voltage switch, in particular for a microwave generator, which includes a spark gap which breaks down in order to switch when a high voltage is applied provided is a plurality of parallel-connected spark gaps (12, 12a, 12b), each having at least one electrode (13, 13a, 13b) with a series-connected fuse (14, 14a, 14b) which is irreversibly destroyed when the respective spark gap (12, 12a, 12b) breaks down.
摘要:
A microwave generator (10) having a hollow central electrode (12) with a front face including hollow emmission element (18), and having an outer electrode (14), which coaxially surrounds the central electrode (12) along an axially extending resonator section (16). The two electrodes (12, 14) define a spark gap (36) and are connected to a high-voltage source (38). An ultracompact microwave generator (10) is implemented by the high-voltage source (38) being arranged in the hollow central electrode (12) of the microwave generator (10) rather than on the outside thereof.
摘要:
This invention relates to solutions of polyurethaneureas in γ-butyrolactone or mixtures of γ-butyrolactone with toxicologically acceptable organic solvents. A process for coating substrates using these polyurethaneurea solutions, and substrates coated by said process are also provided. The substrates coated according to the invention are preferably textile products or leather, but materials such as wood or concrete can also be coated according to the invention.
摘要:
Intensive microwave radiation in particular of great band width and energy over a relatively long period of time in the form of long pulse packets with a high pulse repetition frequency and a very high frequency spectrum can be achieved if microwave irradiation is effected during the discharge of a capacitive high-voltage generator (35) by way of the antenna (26) into a series of successive capacitors (13) to be connected in parallel. They are preferably constructed in the form of a concentric stack, connected to the antenna (26), of which the outer electrodes (16) which are at a reference potential are in the form of a continuous tube within which annular electrodes (15) are disposed on a carrier (20) in axially spaced relationship with each other in such a way that at the same time they act as the electrodes of arc switches (39) for successively switching on subsequent capacitors (13). The switch response characteristics and the charging time constants of the capacitor (13) which is respectively switched on therewith and the number thereof determine the length of the packet of high-frequency individual pulses (40) and thus the radiated microwave energy which can be still further increased by an increase in the capacitance of the capacitors (13).
摘要:
In order to make it possible to direct sufficient microwave energy at a target with an electronic device which is to be interfered with or to be destroyed, the beams (7) from at least two antenna arrays (10) are focused on an effective area (8) in the vicinity of that target, preferably from a vehicle (3) which is equipped with these arrays (10). For effective super-imposition of the emitted microwave energy (7) in the emission direction of in each case one of the arrays (10), the use of an arc for discharging the capacitance (43) of the resonator via its spark gap (13) is observed, and is recorded quasi-continuously optoelectronically. The electrode separation of the spark gap (13) or the fluid pressure of the dielectric in the vicinity of the spark gap (13) is then varied by control elements such that all of the spark gaps (13) in an array (10) ignite virtually at the same time, so that their discharge current pulses which lead to the emission of the microwave energy (7) start virtually in phase.
摘要:
The invention concerns ionic and/or non-ionic hydrophilic, aqueous polyurethane-polyurea dispersions (PU dispersions) based on polycarbonate polyols and polytetramethylene glycol polyols, a process for their production and their use as coating compositions, in particular for the production of very stable thick foam deposits in a single coat.