摘要:
An optical lens is provided which comprises at least one layer of a birefringent material wherein the birefringent material has a crystal structure formed by at least one polycyclic organic compound with conjugated π-system, and an intermolecular spacing of 3.4±0.3 Å is in the direction of at least one of optical axes.
摘要:
A system and method is disclosed for obtaining measurements of the electric fields around skin wounds and lesions on mammals noninvasively. The system and method is comprised of a vibrating metallic probe tip that is placed close to the skin in the air. By applying a series of known voltages to the metal probe tip or to the skin beneath it, the skin's local surface potential can be measured and the lateral electric field can be calculated from the spatial distribution of surface potential measurements. Surface artifacts that can affect the measurements are removed and active feedback is used to maintain a constant distance between the probe and the skin surface.
摘要:
Source-implemented constraint-based routing with source routing enables traffic engineering to be performed and reservations to be made within a domain without requiring constraint information and reservation information to be disseminated to all nodes in the domain. In one embodiment, a focal node maintains a table containing metrics of links and connection reservations through the domain. When a connection is to be added, the focal node determines a path, given the constraints reflected in the table, and allocates resources on the links forming the path. The table is updated, and the path is used to generate headers for traffic associated with the connection. Traffic from the nodes toward the focal point follow the reverse path. If a node or link fails, connections carried through the failure are identified, reservations on links associated with the connections are released, and new reservations are made taking into account the new network topology.
摘要:
A pre-fabricated warped pavement slab and a forming system for making the slabs. The forming system includes a plurality of forming sections which can be adjusted so as to form a warped-plane pavement slab. Also disclosed are methods for making the pavement slab and forming system. Also disclosed is a method for installing the warped pavement slab.
摘要:
An ion thruster comprises a chamber in which propellant is ionized and an accelerator grid, whereby a flow of ions out of the chamber provides reactive thrust. Charge exchange between neutral atoms of propellant and fast moving ions produces slow ions which impact on the accelerator grid and erode it by sputtering, thus limiting the lifetime of the thruster. The invention includes an accelerator grid comprising a layer which includes graphite providing resistance to erosion and a support layer which overcomes the restrictions on engineering and strength of graphite. The accelerator grid can be constructed by machining a block of graphite 12 to produce an upper surface 13, to which the molybdenum grid 14 can be fixed. The block 12 can then be cut away to permit the graphite to be machined to the same contour as the surface 13. Apertures are drilled through the graphite using the existing apertures of the grid 14 as guides.
摘要:
This invention involves a system and method for the installation of a prefabricated composite structural members. The system utilizes deck panels which have a plurality of steel C-beam pairs attached to the underside such that a series of channels is formed. Bored through each deck panel is a plurality of access holes which projects through the panel and into one of said channels. Thus, installers can access underlying bridge girders from the surface of the deck panels thereby allowing for top-side installation. The system also provides a top-side vertically adjusting device for raising or lowering the deck panels to allow for the top-side installation of shimming devices.
摘要:
A thruster system has a main bipropellant propulsion unit including a propulsion engine (50) and bipropellant supply having a tank (3) for an oxidizing agent and a tank (4) for a fuel. An auxiliary cold propellant thruster (21) uses propellant supplied by bleeding off vapor from the contents of the oxidizing agent tank (3).
摘要:
The present invention provides a fish cage having a body portion and floats or weights attached thereto at one of a plurality of different positions so that the cage will float in water with a first part exposed and a second part submerged. Changing the position of attachment of the floats or weights results in different first and second parts being respectively exposed and submerged allowing successive cleaning of different first parts of the cage body.
摘要:
Disperse monoazo dyestuffs, free from carboxylic and sulphonic acid groups, derived from 3,5-dinitro-2-amino thiophene as disazo component and an arylamine coupling component exhibit superior properties when used to give colorations to textile materials such as secondary cellulose acetate and cellulose triacetate, polyamide and aromatic polyester textile materials, said colorations having excellent fastness to light and to wet and dry heat treatments. The dyestuffs also have high tinctorial strength and excellent dyeing and build-up properties and produce depths of shade which are relatively independent of the dyebath pH, or the temperature of the dyebath or the liquor ratio of the dyebath.
摘要:
The disperse monoazo dyestuffs, free from sulphonic acid groups, which are of the formula: ##STR1## wherein X is hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, --NR.sup.1 R.sup.2, --SR.sub.3, chlorine, bromine --OR.sup.3 or --SO.sub.2 R.sup.3 ;Z is hydrogen, alkyl, substituted alkyl, aryl or substituted aryl;Y is hydrogen, nitro, cyano, --COOR.sup.3, --COR.sup.3, --CONR.sup.1 R.sup.2, --SO.sub.2 R.sup.3 or --SO.sub.2 NR.sup.1 R.sup.2 ;E is the residue of a coupling component;R.sup.1 is hydrogen, alkyl or aryl;R.sup.2 is hydrogen or alkyl; andR.sup.3 is alkyl or aryl,A process for the manufacture of the said dyestuffs, and their use for coloring synthetic textile materials.