General Electric

About: General Electric is a company organization based out in Boston, Massachusetts, United States. It is known for research contribution in the topics: Turbine & Rotor (electric). The organization has 76365 authors who have published 110557 publications receiving 1885108 citations. The organization is also known as: General Electric Company & GE.

Electronic device pad relocation, precision placement, and packaging in arrays

Abstract: Top die pads are electrically relocated by forming holes through a semiconductor wafer between device active regions. An electrically insulating layer is formed over all exposed surfaces of the wafer, including within the holes, and openings are made in the insulating layer for access to the top interconnection pads. The wafer and holes are metallized and patterned to form bottom interconnection pads electrically connected to corresponding top interconnection pads by metallization extending within the holes. A dicing saw having a kerf width less than the diameter of the holes is employed to separate the individual devices. For accurate position alignment of repatterned die, an alignment structure, such as projecting pins or an egg crate structure, engages the die, and alignment pads can be patterned on the die.

A software design method for real-time systems

Abstract: DARTS—a design method for real-time systems—leads to a highly structured modular system with well-defined interfaces and reduced coupling between tasks.

Lightning Protection of Aircraft

Abstract: The current knowledge concerning potential lightning effects on aircraft and the means that are available to designers and operators to protect against these effects are summarized. The increased use of nonmetallic materials in the structure of aircraft and the constant trend toward using electronic equipment to handle flight-critical control and navigation functions have served as impetus for this study.

The Thermal Conductivity of Bismuth Telluride

Abstract: Measurements of the thermal conductivity of bismuth telluride have been made in the range of temperature 150°K to 300°K. It has been found that the electronic contribution to the conduction of heat is considerably greater for specimens in which the charge carriers are intrinsically excited than for specimens in which most of the carriers arise from an impurity concentration; this can be explained by the recently proposed theory which takes into account the transfer of ionization energy down a temperature gradient.

Asymmetrical Duty Cycle Control and Decoupled Power Flow Design of a Three-port Bidirectional DC-DC Converter for Fuel Cell Vehicle Application

Abstract: This paper proposes a new asymmetrical duty cycle control method for a three-port bidirectional DC-DC converter with two current-fed ports interfacing with low voltage battery and ultracapacitor in a fuel cell vehicle. Along with the phase shift control managing the power flow between the ports, asymmetric duty cycle is applied to each port to maintain a constant DC bus voltage at low voltage side, which as a result will achieve wide zero-voltage-switching (ZVS) range for each port under varied ultracapacitor and battery voltages. The ZVS range analysis of different duty cycle control methods as well as the circulation power loss between the ports have been analyzed. In addition, the power flow design featuring the reduced coupling factors between the ports have been developed for the three-port bidirectional DC-DC converter. A fuel cell vehicle power train including a 2.5 kW three-port DC-DC converter interfacing a 12 V battery and ultracapacitor was built in the laboratory. The proposed asymmetrical duty cycle control and power flow design was implemented and verified on the hardware test bed under urban driving cycle. The experimental results validated that proposed asymmetrical duty cycle method has higher efficiency than other methods; furthermore, they also validated the reduced coupling factor between phase shift control and duty cycle control.