摘要:
A controller IC adjusts the on time and cycle time of current flowing through the primary inductor of a flyback converter to generate a constant output current and constant output voltage. A desired output current limit is achieved even with an inductor whose inductance varies from the stated magnitude. A transconductance current is generated from a voltage across an emitter resistor and is then integrated to generate an integrated-current voltage. An inductor switch is turned on by an oscillator signal and turned off at the earlier of when the integrated-current voltage reaches a charge limit voltage during constant current mode or when the emitter resistor voltage reaches an error voltage during constant voltage mode. Current is output independently of the primary inductance by varying the current limit voltage inversely proportionally to the input voltage and by adjusting the cycle time so that it varies inversely proportionally to the output voltage.
摘要:
A heat dissipation device for dissipating heat from an electronic component. The heat dissipation device includes a shroud having a bottom wall and a sidewall partially surrounding the bottom wall, a base mounted on a bottom of the bottom wall, a bracket fixed on a top of the bottom wall, an impeller rotatably mounted on the bracket, a fin assembly arranged on the bottom wall, a plurality of heat pipes connecting the fin assembly with the base, and a cover secured on the sidewall. An end of the bottom wall extends beyond the sidewall to support the fin assembly thereon. An opening and a window are respectively defined in the bottom wall and the cover. A plate is formed within the opening of the bottom wall and connects the bracket with the base.
摘要:
A disk drive head stack assembly includes an actuator arm tip that includes a swaging hole centered about a swaging axis. A first suspension assembly has a first swage boss that protrudes into the swaging hole. A second suspension assembly has a second swage boss that protrudes into the swaging hole and does not contact the first swage boss. Each of the first and second swage bosses includes an inner lip that extends radially closer to the swaging axis than any other part of that swage boss. The inner lip thickness of the first swage boss, measured parallel to the swaging axis, increases more greatly with increasing radial distance from the swaging axis than does the inner lip thickness of the second swage boss.
摘要:
In one embodiment, a code server and edit server are provided. The code server stores the source code. Users do not access the code server directly. Rather, an edit server is used where users can log in to the edit server and send requests to edit portions of the source code. The edit server then sends requests to the code server for requested portions of the source code. Different users may have different access-rights to portions of the code. When the request is received from the edit server, if the code server determines the user requesting the portion of the source code does not have access rights to it, then the code server does not allow the portion of code to be accessed. However, if the user does have access rights, then the portion of the source code is retrieved and sent to the edit server. The user can then edit the source code on the edit server.
摘要:
A computerized method for generating risk forecasts is provided. A set of securities is selected. A set of risk factors is selected. The risk factor returns a determined. A risk factor covariance matrix and an idiosyncratic variance matrix are constructed. For each risk factor, a factor loading coefficient is determined for each selected security. The risk factor covariance matrix is projected into a future forecast. The idiosyncratic variance matrix is projected into a future forecast. The factor loading coefficients, the future forecast of the risk factor covariance matrix, and the future forecast of the idiosyncratic variance matrix can be used to determine a forecast of the variance-covariance matrix for the selected securities.
摘要:
A method for receiving and sending media, a user equipment (UE), and a service guide (SG) server are disclosed in the present invention. The method includes: receiving an SG that includes first access information, access association information, and second access information; receiving media corresponding to the first access information, where the media corresponding to the first access information supports a service or content; and when switching is performed, determining the second access information according to the access association information, and accessing media corresponding to the second access information, where the media corresponding to the second access information also supports the service or content. With the embodiments of the present invention, the smooth transition of the service or content can be ensured when bearer resources are switched, thus the user experience is enhanced.
摘要:
A computerized method for generating risk forecasts is provided. A set of securities is selected. A set of risk factors is selected. The risk factor returns a determined. A risk factor covariance matrix and an idiosyncratic variance matrix are constructed. For each risk factor, a factor loading coefficient is determined for each selected security. The risk factor covariance matrix is projected into a future forecast. The idiosyncratic variance matrix is projected into a future forecast. The factor loading coefficients, the future forecast of the risk factor covariance matrix, and the future forecast of the idiosyncratic variance matrix can be used to determine a forecast of the variance-covariance matrix for the selected securities.
摘要:
A system and method for determining fair value prices of financial securities of international markets includes steps of selecting a universe of securities of a particular international market, computing overnight returns of each security in the selected universe over a predetermined past period of time, selecting at least one return factor of a domestic financial market from a plurality of return factors, computing, for each selected return factor, the return factor's daily return over said predetermined past period of time, calculating, for each selected return factor, a return factor coefficient for each security in the selected universe by performing a time series regression to obtain the contribution of each return factor's return to the security's overnight return, and storing each calculated return factor coefficient in a data file.
摘要:
A protective device (10) for protecting thermal interface material (30) spread on a central surface (512) of a bottom of a base (51) of a heat sink (50). The device includes a case (12) and a tab (18) extending from an edge of the case. The heat sink (50) has air channels (552) extending vertically therethrough and around the base. The case comprises an annular frame (120) and a cap (15) protruding downwardly from inside edges of the frame. The cap covers the thermal interface material. The frame is attached to the heat sink around the thermal interface material. The frame blocks portions of the air channels adjacent to the base, thereby to prevent dust or foreign particles from contaminating the thermal interface material through the air channels.
摘要:
A heat dissipation device for a first electronic component and a second electronic component mounted on a circuit board includes a first base mounted on the first electronic component and a second base mounted on the second electronic component. The second base is movably connected with the first base. An electronic system incorporating the heat dissipation device is also provided.