摘要:
A first outer container is formed with a side wall and a bottom wall. The bottom of the first container has a support structure or raised area to define a water reservoir in the bottom of the container. An overflow drain is provided in the container and preferably in the raised area to limit the depth of the water reservoir. A second inner container including a drain hole and having a live plant is placed in the first container at or above the water level in the first container. The water in the first container has a depth to inhibit excessive root growth from the drain hole of the second container. Roots which grow through the drain of the second inner container contact the standing water in the reservoir and die and rot at the point where the roots contact the water to limit growth in the first container. The water in the first container is particularly effective in controlling root growth from the inner container through the drain holes in the first outer container.
摘要:
An article, such as a container, includes a bottom wall, a sidewall and rim around a top end to strengthen the sidewall and to provide a handle for lifting the article. The rim includes a first lip extending radially outward with respect to the container to provide strength and rigidity to the rim and sidewall. The first lip is formed by two substantially parallel layers of material that can be spaced apart or bonded together. A second flexible lip extends radially from the rim and is axially spaced from the first lip. The second lip forms a continuous open channel enabling the second lip to be gripped from the inside of the article. The second lip has a radial dimension greater than the first lip to limit contact of the first lip with an adjacent object. An article is made by a blow molding process and apparatus having moving segment molds. A thermoplastic parison is inflated to contact the mold surfaces. The moving mold segments then compress a portion of the plastic to form the first lip.
摘要:
An electrically short antenna for transmitting or receiving radiation has first and second electrode forming a capacitor radiator. The antenna is short in the sense that the gap distance between the electrodes and the dimension of the electrodes themselves sum to less than .lambda./4. An inductor has one end thereof coupled to one of the first and second electrodes via a first wire, and the other of the electrodes is connected to ground via a second wire. The antenna includes structure for inhibiting transmission or reception of electromagnetic energy of wavelength .lambda. from first and second wires so that transmission or reception of electromagnetic energy primarily emanates from said electrode surfaces.
摘要:
An apparatus for producing blow-molded containers having thickened flanges. The apparatus utilizes movable mold halves having separable side and end components and a stationary central mold element disposed between the movable mold halves to form containers having thickened radial flanges. The movable mold halves and stationary central mold elements together enclose a mold chamber. After the parison of thermoplastic material has been blow-molded to conform to the mold chamber but while the material is still moldable, the movable mold halves simultaneously move together along the axis of the mold chamber to press the material against the stationary central mold element and thereby fold and bond the material onto itself, forming a thickened radial flange on each container. The flanges are each substantially twice as thick as a single layer of blow-molded material. The thickened flanges may also be formed to each include a thickened axial lip of material extending down from the respective radial flanges. After the thermoplastic material has cooled sufficiently to retain its shape, the side components of the mold halves are axially moved apart so that the mold chamber can be opened along its longitudinal axis without damaging the thickened radial flanges or axial lips. By keeping the end components of the mold halves substantially still during the retraction of the side components of the mold halves, the tail of material formed at the junction of the halves of the molding apparatus opposite to the feed end of the blow-molding chamber is preserved, thereby facilitating post-processing handling of the containers.
摘要:
A radar false target elimination system for converting incident microwave electromagnetic energy to thermal energy to preclude reflection of radar energy which would otherwise induce the generation of a beacon response and a false target from an aircraft being tracked by the radar. The invention comprises a layered, sandwich configuration of materials, including an electrical component sheet having a coating of a combination of carbon and polymide resin in a selected ratio by weight on a low dielectric constant and loss tangent substrate and in a selected geometrical configuration to provide a lossy mixture for achieving the aforesaid energy conversion.The panel comprising such a sandwich configuration is mounted on potentially reflective structures in the vicinity of the radar which would otherwise permit reflections of radar energy along a false path to an aircraft. The panels are mounted substantially normal to the path between the otherwise reflecting surface and the radar antenna to maximize the energy conversion characteristics.
摘要:
Systems and methods for calculating an initial amount of target nucleic acid N0 in a sample are provided. A plurality of fluorescent measurements is received. Each respective fluorescent measurement FSn is taken in a different cycle n in a PCR amplification experiment of the sample. Then, a model for the PCR amplification experiment is computed. For each respective fluorescent measurement, the model comprises a respective equation for Nn, where (i) Nn is the calculated amount of the target nucleic acid in cycle n of the corresponding PCR amplification experiment, and (ii) the equation for Nn is expressed in terms of K and N0, where K is the Michaelis-Menton constant. The model can be refined by adjusting K and N0 until differences between model values Nn and corresponding fluorescent measurements are minimized, thereby calculating the initial amount of a target nucleic acid N0 as the minimized value for N0 for the model.
摘要:
A method is provided for designing an integrated circuit that includes receiving a graphical description of the integrated circuit, extracting shapes relating to a specific circuit function from the graphical description of the integrated circuit, and partitioning the extracted shapes into a plurality of segments. The method may form an electrical representation of the integrated circuit for each of the plurality of segments and solve a matrix equation (Gv=i) for each of the plurality of segments based on the electrical representation.
摘要:
A fixing element for connecting materials of relatively low strength includes a unitary, one-piece plastic body. An external thread is formed on the plastic body for compressing and compacting the low strength material in the thread turns of the external thread. A first external thread portion has a taper at one end of the plastic body. A second portion has a taper at another end of the plastic body, while a third portion has no taper and extends between the first and second external portions. A penetration tip is connected to the smaller diameter end of the first external thread portion. Further, a stop collar is provided at the large diameter end of the second external thread portion. The penetration tip preferably is a self tapping screw made of a harder material than the plastic body. Further, the thread depth of the second external thread portion decreases along the second external portion as the second external portion approaches the larger diameter of the screw.
摘要:
A process for producing blow-molded containers having thickened flanges. The process utilizes movable mold halves having separable side and end components and a stationary central mold element disposed between the movable mold halves to form containers having thickened radial flanges. The movable mold halves and stationary central mold elements together enclose a mold chamber. After the parison of thermoplastic material has been blow-molded to conform to the mold chamber but while the material is still moldable, the movable mold halves simultaneously move together along the axis of the mold chamber to press the material against the stationary central mold element and thereby fold and bond the material onto itself, forming a thickened radial flange on each container. The flanges are each substantially twice as thick as a single layer of blow-molded material. The thickened flanges may also be formed to each include a thickened axial lip of material extending down from the respective radial flanges. After the thermoplastic material has cooled sufficiently to retain its shape, the side components of the mold halves are axially moved apart so that the mold chamber can be opened along its longitudinal axis without damaging the thickened radial flanges or axial lips. By keeping the end components of the mold halves substantially still during the retraction of the side components of the mold halves, the tail of material formed at the junction of the halves of the molding apparatus opposite to the feed end of the blow-molding chamber is preserved, thereby facilitating post-processing handling of the containers.