摘要:
The present invention relates to compounds of the formula: R.sub.1 SCH(R.sub.2)CH(R.sub.3)CO-AA.sub.1 �AA.sub.2 !.sub.m �AA.sub.3 !.sub.n --X or HSCH.sub.2 �CH.sub.2 CH(CH.sub.3).sub.2 !CO--Nal--NH.sub.2 wherein Nal is L-3-(2-naphthyl)alanine; m is the integer 0 or 1; n is an integer from 0-2; AA.sub.1 is a non-polar hydrophobic aromatic amino acid; AA.sub.2 is alanine, glycine, leucine, isoleucine or phenylalanine; AA.sub.3 is one of the twenty naturally occurring amino acids, preferably glutamine or arginine; R.sub.1 is hydrogen, alkyl having from 1-10 carbon atoms, alkanoyl having from 2-10 carbon atoms, or aroyl having from 7-10 carbon atoms; R.sub.2 is hydrogen or alkyl having from 1-6 carbon atoms; R.sub.3 is hydrogen, alkyl having from 2-10 carbon atoms, cycloalkyl having from 3-6 carbon atoms, aryl or arylalkyl, wherein aryl moieties have from 6-10 carbon atoms; X is NH.sub.2, OH, OCH.sub.3 or OCH.sub.2 CH.sub.3 ; and salts thereof.
摘要:
A beam of energy in a first form, such as electrons, is provided in a first direction. The beam may be pulsed or continuous. The beam is intercepted by a member, such as a converter target, to produce energy in a second form such as x-rays. The converter target may be formed from a heavy material such as tungsten or tantalum. The interaction of the electron beam with the converter target will produce energetic bremsstrahlung x-rays in an energy range including 10.6 Mev to approximately 13.0 Mev. This range is sufficient to excite the abundant nitrogen atoms in common explosives to induce the production of annihilation photons but is not sufficient to substantially excite atom of the most abundant elements of the earth's crust (e.g. oxygen, silicon, iron, aluminum, carbon, hydrogen, etc.), which comprise most common fabricated articles and soils. The converter target is disposed relative to an object (e.g. a suitcase in an airport) to obtain the production of energy in a third form, such as photons, from the object. The photons pass to a detector such as a scintillation counter which determines the concentration of the nitrogen in the object. The detector may be gated so as to be activated only when the photons are passing from the object to the detector. When the object is a suitcase which is moved along a conveyor, the detector may be downstream from the source in the direction of movement of the conveyor.
摘要:
An autogenerating apparatus provides secondary intense relativistic current beam pulses in response to an injected beam pulse. One or more electromagnetic energy storage devices are provided in conjunction with gaps along a beam propagation path for the injected beam pulse. For injected beam pulses which are no longer than double the transit time of electromagnetic waves within the storage devices (which may be resonant cavities), distinct secondary beam pulses are generated by each of the energy storage devices. The beam propagation path, together with the one or more gaps provided therein, operates as a pulse forming transmission line cavity, in which the separate cavities associated with the gaps provide delays for electromagnetic waves generated at the gaps. After doubly traversing the cavity, the electromagnetic waves cause the gap to generate the secondary beam pulses, which are thus delayed by a time interval equal to the double transit time for the induced wave within the cavity.
摘要:
A method and apparatus for permanently and sealably connecting two duct sections, the duct sections having peripheral flanges forming opposite and corresponding halves of a composite, T-shaped peripheral flange extending outwardly from the duct sections. The composite flange has an upper cross-piece portion and a lower upright portion, the lower upright portion of the T-shaped flange containing a continuous reservoir of deformable gasket material. The method comprises the steps of first placing square-cornered, U-shaped clamps over the upper cross-piece portion of the T-shaped flange at spaced intervals thereon; secondly, pressing sides of each of the clamps inwardly and crimping the clamps to upper and lower surfaces of the upper cross-piece portion, forcing a portion of the gasket material to flow from the reservoir between the flange halves, towards the duct sections, thereby producing a sealed joint between the duct sections; and thirdly, rippling each of the clamps simultaneously with the upper cross-piece portion adjacent each of the clamps, causing undulations in both which prevent the clamps from slipping out of clamping contact with the upper portion of the T-shaped flange, thereby permanently connecting the duct sections.
摘要:
An electron gun emits a steady stream of electrons. The electrons pass to a modulating cavity which accelerates some of the electrons and decelerates other electrons in a particular timed relationship so that the electrons become periodically bunched. The bunched electrons are then accelerated in an accelerator to a constant speed such as the speed of light to maintain the bunching of the electrons and to substantially increase the energy of the electrons. The kinetic energy in the bunches of electrons is then converted to microwave energy. The conversion may occur in one output cavity or in a series of output cavities. Apparatus such as described above may be connected in parallel to further increase the output microwave energy.
摘要:
A method is provided for preparing decapeptide and undecapeptide derivatives of LHRH by solution phase peptide chemistry as well as intermediate peptides useful in the same method.
摘要:
A self-contained hermetically sealed foil changer for advancing a portion of foil web into a position normal to the path of a high energy particle beam. The path of the beam is defined generally by an aperture plate and cooperating axially movable barrel such that the barrel can be advanced toward the plate thereby positioning a portion of the foil across the beam path and sealing the foil between the barrel and the plate to form a membrane across said beam path. A spooling apparatus contained in the foil changer permits selectively advancing a fresh supply of foil across the beam path without breaking the foil changer seal.
摘要:
The acceleration of large numbers of ions to high energies uses an intense relativistic electron beam produced by a vacuum diode. An electron beam radial profile is maintained by a strong longitudinal magnetic field. A virtual cathode, characterized by an electrostatic potential depression whose depth corresponds to the injected electron beam kinetic energy will form. The virtual cathode is caused to move backwards toward the vacuum diode by utilizing the time history of the injected electron beam voltage and current, and by appropriately flaring the drift tube. Ions trapped in the potential well associated with the virtual cathode move with the virtual cathode and are synchronously accelerated.
摘要:
A conventional fireplace with a mantel, a hearth and a chimney has an air intake port and an air exhaust port disposed in the mantel. An air intake fan also disposed in the mantel is connected in series with copper pipe, and the fan is connected to the intake port while the remote end of the pipe feeds the exhaust port. The pipe is routed over the hearth and below the chimney. When a fire is lit in the fireplace, and the fan is turned on, the air passed through the pipe is heated by the fire and blown throughout the room.
摘要:
A recombinant lead acid battery is provided having positive and negative plates coated with active material and separated by a compressible separator material containing an electrolyte. A casing provides structural support for the plates and encases the battery's components. The battery is preferably a recombinant lead acid battery with its plates being formed of lead foil sheets. The casing is reinforced and arranged to i) maintain a substantially evenly distributed compressive force on the separator material and ii) maintain a constant spacing between the plates. The battery is arranged to maintain a compressive force of at least eight psi on the plates which has been found to significantly reduce the incidence of premature capacity loss (PCL). By way of example, compressive forces in the range of 8-14 psi work well for conventional separator materials. In one embodiment, the casing includes a plurality of reinforcing support pins extending between upper and lower casing members through the plates and separator material for maintaining the evenly distributed pressure. Plates may be slacked one above another to provide a plurality of cells. A method of making the battery is also described.