摘要:
Systems and methods for the reduction of volatile component content from shaped prepregs and prepreg layups and the layups and composites formed therefrom are disclosed. One or more shaped prepregs or prepreg layups are placed within an enclosure and a flow of a non-condensing gas is introduced adjacent at least one surface of the shaped prepregs or prepreg layups, accelerating the rate and/or the completeness of removal of volatile components from the shaped prepregs or prepreg layups. The shaped prepregs or prepreg layups may be further subjected to heat, vacuum, and external pressure to facilitate removal of the volatile components. Shaped prepregs and prepreg layups with volatiles reduced in this manner may be further consolidated with heat, external pressure and/or vacuum. Beneficially, reduced matrix bleed and reduced fiber movement may be achieved during processing, reducing manufacturing time and improving part quality.
摘要:
Particle-toughened polymer compositions include a base polymer formulation and a plurality of toughening particles. In certain embodiments, the base polymer formulation includes bismaleimides or other polymer resins capable of high temperature service. A first plurality of toughening particles may include core shell rubbers. A second plurality of toughening particles may be selected from a variety of polymer compositions, including polyimides, polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether imide, polyether sulfones, and polyphenylene oxide. It is found that increasing concentration of the core shell rubbers may improve the toughness of the composition while preserving thermal properties of the composition, such as glass transition temperature.
摘要:
Particle toughened, fiber-reinforced composites include a fiber region and an interlayer region between the fibers. The fiber region includes a plurality of fibers at least partially within a first polymer composition including a first base polymer formulation and a first plurality of toughening particles. The interlayer region includes a second polymer composition including a second base polymer formulation and at least one of the first plurality of toughening particles and a second plurality of toughening particles. Examples of first and second pluralities of toughening particles, respectively, may include core shell rubbers and polyimides. Increasing concentration of the first plurality of toughening particles may improve the composite toughness while preserving thermal properties of the composite, such as weight loss after extended duration exposure to elevated temperature. It is further discovered that the relative placement of the toughening particles influences composite mechanical properties, such as compression after impact (CAI) strength.
摘要:
A golf putter is provided. The golf putter includes a head having a cavity. An insert member is supported within the cavity by Neoprene resilient O-rings and a shaft or hosel member is connected to the insert. Because the insert member is insulated from the head by the resilient O-rings, less impact energy is dissipated within the head. The insert member is arranged to be at the sweet spot of the head.
摘要:
A two-pole make-before-break switch includes a base housing, a cover member secured to the base housing, an actuating member disposed above the cover member, and first and second contact assemblies mounted on an interior portion of the base housing. The first contact assembly includes a normally-open common contact blade member that is closed prior to the closing of another set of normally-open contacts with a snap action in a second contact assembly so as to complete an electrical connection. The switch is operable by depressing the actuator member either in a first direction to effect a manual-up mode of operation or in a second direction to effect down modes of operation.
摘要:
In accordance with certain embodiments a method and system to analyze the content of a packed bag utilizing a scanner is provided. The bag is scanned for a scannable characteristic to acquire scan data representative of a content of the piece of baggage. A volumetric data set is generated from the scan data, wherein the volumetric data set includes voxel values of the scannable characteristic throughout a volume of interest in the baggage. A rendered view is produced of the content of the piece of baggage based on the voxel values within a selected range from the volumetric data set. The method and system also provide identifying a threat by analyzing Hounsfield Units of the material of interest.
摘要:
A medication injector apparatus such as an injection pen. The injection pen includes a resettable, cartridge plunger drive assembly including an axially floating nut, a cartridge plunger engaging screw, and a drive clutch movable with the nut and which when rotated causes the screw to screw through the nut. When a cartridge assembly is mounted to the pen base, the floating nut and drive clutch are shifted proximally such that the drive clutch is in torque transmitting engagement with a rotatable drive member of the pen, such that rotation of that drive member results in drive screw advancement through the nut in the distal direction. When the cartridge assembly is not mounted to the pen base, the floating nut and drive clutch are biased distally to disengage the drive clutch from torque transmitting engagement with the rotatable drive member and to thereby allow the drive screw to be reset proximally through the nut to a position more retracted within the pen base. The injection pen also may include an injection clicker assembly having a collar arranged coaxially on a drive sleeve and which oscillates axially on the drive sleeve that rotates during medication dispensing to provide an audible clicking sound that indicates injecting use of the pen. The injection pen also may include a doseable quantity identifier that uses a rotational matrix and a sensor for electrically sensing the arrangement of the dose setting mechanism of the pen, which identifier may be part of a therapeutic dose indicating system that utilizes a cartridge recognizer to recognize a concentration of medication so as to allow an automatic determination of a therapeutic dose. The injection pen further may include an assembly for selectively rotating a drive sleeve of the pen, which assembly has a dial that rotates out during dose setting and which translates in without rotation during dose injecting.
摘要:
A tubing counter for counting coiled tubing inserted into a well includes an outer housing having a through passage for receiving the coiled tubing therethrough. In some embodiments, pressure rated connectors at both of the ends of the outer housing sealably connect the outer housing in series between the coiled tubing injector head and the outer casing of the well. A plurality of counting wheels are rotatably supported within the outer housing for rolling engagement along coiled tubing inserted through the outer housing while a counting mechanism records a number of rotations of each counting wheel independently of the other wheels to minimize counting errors. Locating the counter below the injector head and below the tubing stripper ensures that the tubing is cleaner and less likely to slip in contact with the counting wheels while also accounting for stretching of the tubing for more accurate measurement.
摘要:
Thermosetting polymers with high temperature capability and superior oxidative stability for composite and adhesive applications are disclosed. These polymers are ideally suited for adhesives and RTM, resin film infusion, and prepreg methods to make polymer matrix, fiber reinforced composite parts.
摘要:
A golf putter is provided. The putter is made of a substantially large (between 25 and 45 mm diameter) parallel thin walled shaft wherein part of the bare shaft forms the grip. A protruding curved end cap forms part of the grip to assist in consistency of positioning the hands when taking a grip of the putter. A thin walled end plate closes off the shaft to the putter head all being designed to maximize “feel” when stroking the ball.