Abstract:
A DC/DC converter, a power converter and a control method thereof are disclosed, where the DC/DC converter includes an output circuit, a rectangular wave generator, a resonant tank, a detection unit and a control unit. The output circuit has a load. The rectangular wave generator converts an input voltage into at least one rectangular wave. The resonant tank provides a first voltage based on the rectangular wave for the output circuit. The detection unit detects a signal related to a state of the load. When the state of the load is light-load or a no-load, the control unit controls a working frequency or a duty ratio of the rectangular wave, so that the duty ratio of the rectangular wave is within a predetermined range, in which a voltage gain of the DC/DC converter is greater than another voltage gain under the condition of 50% duty ratio.
Abstract:
A breast-enhancing brassiere is provided having a pair of breast-receiving cups, each cup including at least one cushioned layer having an inner breast-receiving side and an outer side, and having at least one outer fabric layer affixed to the outer side of the cushioned layer, the inner breast-receiving side including a lower portion and an upper portion, the lower portion having a cushioned thickness greater than the cushioned thickness of the upper portion and projecting inwardly to provide lift and breast enhancement to a wearer, a first pocket formed on the inner breast-receiving side and having a slit formed therein, and a first cushion conforming substantially to the shape of the pocket, the cushion being removably insertable into the pocket to provide supplemental lift and breast enhancement to a wearer.
Abstract:
A DC/DC converter, a power converter and a control method thereof are disclosed, where the DC/DC converter includes an output circuit, a rectangular wave generator, a resonant tank, a detection unit and a control unit. The output circuit has a load. The rectangular wave generator converts an input voltage into at least one rectangular wave. The resonant tank provides a first voltage based on the rectangular wave for the output circuit. The detection unit detects a signal related to a state of the load. When the state of the load is light-load or a no-load, the control unit controls a working frequency or a duty ratio of the rectangular wave, so that the duty ratio of the rectangular wave is within a predetermined range, in which a voltage gain of the DC/DC converter is greater than another voltage gain under the condition of 50% duty ratio.
Abstract:
A brassiere is provided having a pair of breast-receiving cups, each cup comprising at least one fabric layer molded to at least one foam layer, and an inner breast-receiving side and a lower periphery and an upper periphery. A first shaped pocket is formed on the breast-receiving side having a slit formed therein. A first shaped cushion conforming substantially to the shape of the pocket is removably insertable into the pocket to provide breast enhancement to a wearer.
Abstract:
A system for provisioning a geographical image for retrieval, comprising: an application server operating to receive a query for a geographical region in a geographical area of coverage; and a database server operating to store a plurality of geo-image tiles that cover the geographical area of coverage at different zoom levels, the database server is coupled to the application server to receive the query from the application server and return one or more of the plurality of geo-image tiles to illustrate the geographical region requested in the query; wherein the plurality of geo-image tiles are partitioned for storage in the database server in accordance with a database management system (DBMS) scheme and indexed or retrieval with a non-spatial index.
Abstract:
A catalyst component for olefin polymerization comprising an α-cyanosuccinate compound as an internal electron donor, a catalyst comprising the catalyst component, and use of the catalyst in olefin polymerization. When used in propylene polymerization, the catalyst can exhibit good catalytic activity and good hydrogen response, and the resulting polymer can have a good isotacticity and a good molecular weight distribution.
Abstract:
A portable electronic device includes a body, a flippable unit, a pivoting shaft, a first magnetizable element, a second magnetizable element, a magnetic induction sensor IC, and a magnet. The pivot shaft connects the body and the flippable unit. A display is disposed in the flippable unit for showing an image. The magnetic induction sensor IC is disposed in the body. The magnet is disposed at and rotatable with the pivoting shaft. The first and the second magnetizable elements are disposed between the magnet and the magnetic induction sensor IC to enlarge the magnetic field of the magnet such that the magnetic induction sensor IC is capable of detecting change of the magnetic field of the magnet when the flippable unit together with the magnet is pivoted relative to the body.
Abstract:
The present invention generally provides a terahertz (THz) imaging system that includes a source for generating radiation (e.g., a quantum cascade laser) having one or more frequencies in a range of about 0.1 THz to about 10 THz, and a two-dimensional detector array comprising a plurality of radiation detecting elements that are capable of detecting radiation in that frequency range. An optical system directs radiation from the source to an object to be imaged. The detector array detects at least a portion of the radiation transmitted through the object (or reflected by the object) so as to form a THz image of that object.
Abstract:
The present invention provides quantum cascade lasers and amplifier that operate in a frequency range of about 1 Terahertz to about 10 Terahertz. In one aspect, a quantum cascade laser of the invention includes a semiconductor heterostructure that provides a plurality of lasing modules connected in series. Each lasing module includes a plurality of quantum well structure that collectively generate at least an upper lasing state, a lower lasing state, and a relaxation state such that the upper and the lower lasing states are separated by an energy corresponding to an optical frequency in a range of about 1 to about 10 Terahertz. The lower lasing state is selectively depopulated via resonant LO-phonon scattering of electrons into the relaxation state.
Abstract:
A device is provided for measuring radiant energy, the device comprising a substrate; a bolometer formed from a high T.sub.c superconducting material disposed on the substrate in an area that is about 1.times.5 .mu.m.sup.2 and about 0.02 .mu.m in depth; and a planar antenna disposed on the substrate and coupled to receive radiation and to impart the received radiation to the bolometer.