Abstract: A programmable fiber optic delay system employs multiple programmable fiber optic delay lines, and switches among the delay lines for inclusion in an overall delay path. Switching among the delay lines is coordinated with the programming of those lines so that only a delay line with a settled delay program is included in the overall delay path. Each delay line consists of a plurality of fiber optic segments of varying length. The line's delay is programmed by switching in particular segments whose aggregate lengths correspond to a desired delay period. The multiple delay lines are used to simulate target speed and distance for use in testing a radar system. The programming of each individual delay line and the switching between lines is preferably controlled by a computer resident in the target simulator.

Abstract: A method for injecting viscous material into the eye. In the injection into the eye, sufficient material is injected to separate a membrane from the retina so that intraocular scissors may be manipulated between the membrane and the retina to cut the attachment points. The membrane is then aspirated away. The injection is done using a standard glue injector with a one-shot and a continuous mode. The glue injector is pneumatically coupled through a sterile filter and a custom adaptor to a sterile syringe storing the material to be injected.

Abstract: An apparatus and method for injecting viscous material into the body. In the case of injection into the eye, sufficient material is injected to separate a membrane from the retina so that intraocular scissors may be manipulated between the membrane and the retina to cut the attachment points. The membrane is then aspirated away. The injection is done using a standard glue injector with a one-shot and a continuous mode. The glue injector is pneumatically coupled through a sterile filter and a custom adaptor to a sterile syringe storing the material to be injected.

Abstract: A process for biaxially orienting amorphous polymers such as polymethyl methacrylate. The process includes steps of biaxially orienting a feedstock material in a deformation zone; reducing temperature of the material in a cooling zone; and annealing the material in an annealing zone. The process and apparatus produce a biaxially oriented material having enhanced optical quality and impact strength.

Abstract: A flash EPROM cell is fabricated using a standard two polysilicon enhancement mode n-channel transistor process. An active transistor region is formed in a silicon substrate by growing a field oxide around the region. A first polysilicon layer is deposited, etched, and oxidized to form an insulated control gate electrode. A second polysilicon layer is deposited over the active transistor region and the control gate electrode and then anisotropically etched to remove all of the second polysilicon material except for a filament adjacent to the control gate electrode. The filament can be on one side of the control gate electrode or on opposing sides of the control gate electrode. Source and drain regions are formed in the active transistor region with the control gate electrode and the floating gate electrode positioned over the channel region interconnecting the source and drain regions.

Abstract: This invention provides a process for producing biaxially oriented polymer sheet. This process includes the steps of introducing a polymer slab into a deformation zone defined between working surfaces of a set of working tools including a first working tool and an opposed second working tool. The polymer slab is worked in the deformation zone to reduce slab gauge, during which the polymer material being worked flows bi-directionally while the material is not restricted in the lateral direction to produce biaxially oriented polymer sheet. At least the portion of the slab being worked is at a temperature above the glass transition temperature and below the melting temperature of the polymer material. The working surface of at least one working tool in the deformation zone is ultrasonically excited during working of the polymer slab.

Abstract: This invention relates to an anthralin composition having improved stability. The invention further relates to a method for increasing the stability of anthralin in dermatological compositions by incorporating therein a stability enhancing amount of an acid stable anionic surfactant and a water soluble antioxidant.

Abstract: A pneumatic retinopexy injector includes a syringe to which is communicated a controllable gaseous pressure source. A desired volume of a gaseous substance can be injected by the syringe by utilizing a controller to introduce the pressurized gas to the syringe to cause the piston of the syringe to eject any contents of the syringe. The manual controller can comprise a foot pedal having a variable flow pneumatic valve. The invention can also utilize a vacuum source which is switchable to the syringe to allow automatic filling of the syringe.

Abstract: Coextrusion billets of two or more concentric metallic layers are treated by a hot isostatic pressing process and, then, may be succeeded by heating to an elevated temperature followed by quenching in order to form a diffused bondline between the contiguous touching metal layers, which after extruding and reducing into tubing, is relatively free of bondline defects.

Abstract: Coextrusion billets of two or more concentric metallic layers treated by a hot isostatic pressing (HIP) process in order to form a defect-free bondline between the contiguous touching metal layers. The HIP process can also be applied to extruded or further reduced tubes in order to heal bondline defects.

Abstract: A method of inhibiting the proliferation of tumor cells is disclosed which comprises the treatment of such tumor cells with a benzodiazepine having a selective affinity to bind peripheral binding sites on the tumor cell in order to induce non-proliferation of said tumor cells.

Abstract: A socket including a casing having a number of partition plates formed on each lateral side of the socket a vertical receptacle and one or more lateral cylindrical chamber. A conducting plate is disposed in each receptacle bearing against a vertical partition plate. A protuberance set includes a cylinder, a ball and a spring both retained seriesly in the cylinder. A protuberance set is provided in each of the cylindrical chambers so that the ball slightly protrudes from the receptacle.

Abstract: A circuit responsive to a switching signal for dynamically changing the frequency source of a system clock. The circuit allows addition of new frequency sources without substantial changes to the circuit because its circuitry for detecting an inactive cycle period of the new frequency source is asynchronous (i.e. not clocked by the new frequency source).

Abstract: A linear suction control system 10 includes a linear solenoid valve 11 which exhibits a flow through rate having a known proportional relationship with the current through the solenoid 30. Regulated fluid pressure 12 is fed through the linear solenoid valve 11 to a venturi-type pressure vacuum converter 17. The resulting vacuum is proportional to the flow rate through the valve 11 and thus to the current through the solenoid 30. A transducer 16 samples the vacuum output and produces a signal fed to a differential amplifier 17. The signal is compared in negative feedback fashion with a variable input voltage set by a potentiometer 18 or other variable voltage source, so that the transducer signal tracks the voltage source signal. The voltage source can comprise a potentiometer 18 actuated by a foot switch 19 or the like, so that angular position of the foot switch 19 relates directly and predictably to the vacuum output of the converter 13.

Abstract: A clock control apparatus that stops a system clock in a high performance high speed computer a determined number of system clock cycles after the generation of the clock control signal by a digital computer. The apparatus receives a basic clock signal and the clock control signal and generates a system clock for the system. The system clock includes a normal system clock signal and at least one early system clock signal. The basic clock is provided through a delay tap generating a normal basic clock signal and at least one early basic clock signal. In addition, a control state machine receiving the normal basic clock signal and the at least one early basic clock signal and responsive to the clock control signal is provided for starting and stopping the system clock. The clock control signal is synchronized with the earliest system clock and supplied to the clock control state machine.

Abstract: An apparatus is provided for remotely monitoring pH. A support material is provided on which organic dye molecules are covalently attached at a surface density falling within a predetermined range. The pH dependent fluorescence response of the bound organic dye molecules depends critically on surface density of the organic dye molecules bound to the support material and the nature of the covalent linkage betwen the organic dye molecules and the support material. The invention is operated by contacting the support material on which the organic dye is attached with the fluid whose pH is to be determined. When in contact, the organic dye on the support material is illuminated so that it is caused to fluoresce. The intensity of organic dye fluorescence is then related to pH.

Abstract: There is disclosed herein a system for providing control of multiple functions needed to perform eye surgery. A microprocessor based system controls a vacuum generation system using venturis and linear valves and a pneumatic system for driving vitrectomy probes and pneumatic scissors in either a variable frequency, multicut mode or a proportional cut mode where the cutting pressure is proportional to the position of a foot operated position sensor. The frequency of the vitrectomy probe cutting action can also be controlled and the level of vacuum can be controlled from a foot operated position sensor which can also be used to turn on or off a fragmentation device. The footswitch can also be used to turn irrigation fluid on or off, and the flow rate can be controlled from a control on the front panel. By making a certain foot motion in any certain aspiration modes, reflux of the aspiration line can be controlled.

Abstract: There is disclosed a receptacle for a plug on the end of a fiber optic light guide probe used for projecting light into an area in which a surgeon is operating, said receptacle serving to prevent heat transfer from light source to the plug of said probe. A shoulder in the bore of the receptacle engages another shoulder on the plug with minimal area of contact to minimize the area of potential heat transfer. The dimensions of the central bore of the receptacle relative to the plug are such that an air gap exists all around the plug when inserted in the receptacle. The plug is provided with an insulating sleeve behind the plug shoulder, and this sleeve is mechanically supported by a Delrin plate and insert which give the system mechanical support and which minimizes heat transfer between the mechanical support of the receptacle and the plug because of the poor heat conductivity of plastic.

Abstract: A system 10 for proportional control of a pneumatic cutting device 13 includes a linear solenoid valve 11 having a flow rate therethrough proportional to the current passing through the solenoid 32. The linear solenoid valve 11 is actuated by a selectively varied electrical signal generated by a power supply 18 and controlled by a potentiometer 14 which is itself operated by a pedal foot controller 16. Regulated fluid pressure is fed through the linear soleoid valve 11 to a pneumatic cutting device 13 such as an intraocular microscissors which closes increasingly as the applied pressure increases. The linear solenoid valve 11 includes a flow path which is variably constricted or closed by a valve member 36, and a solenoid 32 which is arranged to pull the valve member 36 to open the flow path.