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608 results about "Secondary phase" patented technology

Method and materials for bonding electrodes to interconnect layers in solid oxide fuel cell stacks

A method and related bonding compositions for use in assembling a solid oxide fuel cell (“SOFC”) stack having thermally and chemically stable and electrically conductive bonds between alternating fuel cells and interconnect components in the stack. The improved method and materials allow for the assembly of solid oxide fuel cells having a stronger and more reliable bond with good electrical contact in situ between the SOFC interconnect layers (plates) and the electrodes. The bonding materials and method according to the invention provide good electrical performance while maintaining the mechanical and electrical integrity of SOFC stacks without requiring excessive mechanical compression of the stack as exemplified by prior art systems. The preferred bonding agents comprise a primary phase that provides the electrical conduction path during fuel cell operation, as well as the mechanical strength necessary to insure a reliable connection between the interconnect and the relevant anode or cathode surfaces of the fuel cell. Secondary phases can be added in small amounts to the primary phase to improve adhesion. An exemplary method according to the invention also contemplates various different steps for pre-treating the surfaces of the interconnect plates and electrodes to improve their surface bonding properties.
Owner:CUMMINS ENTERPRISE LLC

Method and Apparatus for Measuring the Flow Rates of the Individual Phases of a Multiphase Fluid Mixture

A flow rate measuring method for a multiphase fluid mixture FM flowing into a line LN, the fluid mixture FM comprising at least a first and a second phase, the method comprising the steps of: passing the fluid mixture through a Venturi tube in which the fluid mixture is subjected to a pressure drop, continuously measuring by means of said Venturi tube permanently installed on the line a differential pressure across the Venturi tube ΔPv and a line pressure of the fluid mixture in the line Pi, punctually measuring at a determined instant by means of a second measuring device removably installed on the line at least one measured parameter of the fluid mixture correlated to the first phase quantity relatively to the second phase quantity, continuously determining at least one estimated parameter of the fluid mixture correlated to the first phase quantity relatively to the second phase quantity based on the punctually measured parameter and an extrapolating scheme, and determining at least one phase flow rate based on the differential pressure across the Venturi ΔPv, the line pressure of the fluid mixture into the line Pi and the at least one measured parameter of the fluid mixture when the second device is installed on the line, and determining at least one phase flow rate based on the differential pressure across the Venturi ΔPv, the line pressure of the fluid mixture into the line Pi and the at least one estimated parameter of the fluid mixture when the second device is removed from the line.
Owner:SCHLUMBERGER TECH CORP

System for and method of monitoring structural integrity of a structure

The present invention, in one embodiment, is a system for determining the structural change (e.g., degradation) of a structural framework coupled to a support base, wherein the structural framework is subjected to first and second periods of excitation. The system comprises a plurality of motion sensors and a CPU. The plurality of motion sensors are distributed along the structural framework. The CPU is in communication with the motion sensors. The plurality of sensors provides to the CPU first motion data that is associated with the first period of excitation. The CPU deconvolves the first motion data to separate a first structural response pertaining to the structural framework from an effect of the first excitation and an effect of the structural framework being coupled to the support base. The plurality of sensors provides to the CPU second motion data that is associated with the second period of excitation. The CPU deconvolves the second motion data to separate a second structural response pertaining to the structural framework from an effect of the second excitation and an effect of the structural framework being coupled to the support base. The CPU compares the first and second structural response to determine whether the structural framework has structurally changed (e.g., degraded).
Owner:COLORADO SCHOOL OF MINES

Design method of low-phase-noise microwave wideband frequency combiner

The invention relates to a design method of a microwave wideband frequency combiner applied to the field of signal interference. According to the method, a DDS (Direct Digital Synthesis) + PLL (Phase Locked Loop) + DAFS (Direct Analog Frequency Synthesis) hybrid frequency synthesis mode is utilized to synthesize a 0.1-18GHz ultra wide band microwave frequency, wherein the frequency band comprises working frequencies of most of microwave signals, can meet the frequency requirement for interfering with most of the microwave signals and especially can be applied to the field of satellite interference; in a DDS+PLL link, a 4-10GHz waveband is synthesized, a double phase locked loop internal mixing synthesis mode is adopted, a secondary phase locked loop adopts a mode of stimulating PLL by DDS, and a main phase locked loop is inserted into an output frequency so as to be mixed with the output frequency; in a DAFS link, DDS+PLL output is utilized as input and expanded to a 0.1-18GHz band width by virtue of a frequency multiplication, frequency demultiplication and down frequency conversion mode so as to be output; and in the whole frequency synthesis process, through carrying out frequency control by virtue of a singlechip and an FPGA (Field Programmable Gate Array) and reasonably selecting the output frequency, frequency multiplication times and mixing frequency of each link, the final output frequency has the characteristics of low phase noise and wide band, and simultaneously the output of strays and harmonic waves can be well restrained.
Owner:BEIHANG UNIV
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