摘要:
The invention relates to a composite foam comprising from 10 to 90% by volume of SiO.sub.2 aerogel particles and from 90 to 10% by volume of a foam, preferably a polyurethane and/or polyolefin foam, a process for its preparation and its use.
摘要:
A low loss power supply device for generating at least one output voltage (Ua) from an input voltage (Ue) having an absolute value which is higher than that of the output voltage. The power supply device has a low power loss and minimum space requirements. The power supply device includes a controller for generating the output voltage and a DC/DC converter having a primary circuit and a secondary circuit. The primary circuit voltage is a difference voltage (U.sub.c1) derived from the output voltage and the input voltage. The secondary circuit generates the output voltage. A further saving of components is achieved by forming the controller from the primary circuit of the DC/DC converter with the primary circuit connected in series with the secondary circuit.
摘要:
The invention describes an observation device, having two tubular observation parts, wherein the longitudinal axes of the observation parts in the region of the ocular sides are spaced apart by a distance of at least 54 mm. At least one observation part has a flared portion on an external side, wherein the flared portion is located inside a subsection of between 20% and 80% of an overall length of the observation part. The flared portion lies in an annulus section having a normal distance to the optical axis of the objective of between 130% and 250% of the radius the objective lens.
摘要:
The invention relates to a method of determining a replacement distance when taking aim on a target (2) with a target distance D (6) and an elevation angle α (5) between a line of sight (4) to the target (2) and a horizontal plane (3) with a weapon (9) in order to fire projectiles with an approximately flat trajectory. The replacement distance is determined from the target distance D (6) by means of a correction function, and the correction function is determined exclusively from non-ballistic characteristic values and at least as a function of the target distance D (6) and the difference in angle between the elevation angle α (5) and the shooting angle.
摘要:
The present invention relates to a composite material that contains 5 to 97%-vol aerogel particles, at least one binder, and at least one fibre material, the diameter of the aerogel particles being ≧0.5 mm, a process for manufacturing this, and the use thereof.
摘要:
Interpenetrating organic and inorganic networks with a maximum dimension of 100 mn are produced by: (1) mixing aqueous solutions or dispersions of organic polymers capable of forming polymer networks in aqueous phase, polymer precursors or the mixtures thereof and silicon dioxide components; (2) changing the pH value and/or thermally treating the aqueous solution or dispersion in order to form a gel made of interpenetrating organic and silica gel networks and (3) drying the gel.
摘要:
The present invention relates to mat-shaped composites having porosities above 60% and densities below 0.6 g/cm.sup.3, comprising an aerogel and fibers dispersed therein, the aerogel having cracks and the aerogel fragments enclosed by the cracks, whose average volume is 0.001 mm.sup.3 to 1 cm.sup.3, being held together by the fibers. The present invention further relates to processes for producing the composites of the invention and to their use.
摘要:
The disclosure is a composite material having at least one layer of fiber web and aerogel particles, wherein the fiber web comprises at least one bicomponent fiber material, the bicomponent fiber material having lower and higher melting regions and the fibers of the web being bonded not only to the aerogel particles but also to each other by the lower melting regions of the fiber material, a process for its production and its use.