University of Houston System

Ching-Wu Chu

Ruling L Meng

Yu-Yi Xue

Li Gao

Yuyi Xue

Diego Alberto Ramirez

Audrius Brazdeikis

Feng Chen

Jason Shulman

Stephen Tsui

Y Q Wang

Zhong L Du

An intraluminal sensor designs for multifunctional characterization of injured, stunned, infarcted myocardium, atherosclerotic plagues and tumors are disclosed. Various embodiments of the present invention comprise the sensor tips for a catheter. The tips comprises differential sensor arrangements, and use built-in electromagnet assemblies for a single or multiple axis sensing of various parameters of local magnetic field.

Intraluminal multifunctional sensor system and method of use

Described is a superconducting composition comprising an oxide complex of the formula [LM]AOwherein L is lanthanum, lutetium, yttrium or scandium; A is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, or vanadium; M is barium, strontium, calcium, magnesium or mercury; and 'a' is 1 to 2; 'b' is 1; &#x201c;x&#x201d; is a number in the range of 0.01 to 0.5 and preferably 0.075 to 0.5; and &#x201c;y&#x201d; is about 2 to about 4. The oxide complexes of the invention are prepared by solid-state reaction procedure which produce oxide complexes having enhanced superconducting transition temperatures compared to an oxide complex of like empirical composition prepared by a coprecipitation&#x2014;high temperature decomposition procedure. With a solid-state reaction prepared oxide complex of the invention a transition temperature as high as 100&#xb0; K has been observed even under atmospheric pressure.

High transition temperature superconducting compositions

A negative dielectric is induced by the application of a dc bias-electric field in aggregates of oxide nano-particles whose surfaces have been specially treated. The magnitude of the dielectric constant and the frequency where the negative dielectric constant occurs can be adjusted. Such material systems have profound implications in novel devices as well as in science development, e.g. unusual wave propagation, secured communication and ultra-high temperature superconductivity.

Generation and applications of negative dielectric constant materials

Described is a superconducting composition comprising an oxide complex of the formula [LM]AOwherein L is lanthanum, lutetium, yttrium, or scandium; A is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, or vanadium; M is barium, strontium, calcium, magnesium or mercury; and 'a' is 1 to 2; 'b' is 1; and &#x201c;x&#x201d; is a number in the range of 0.01 to 1.0; and &#x201c;y&#x201d; is about 2 to about 4. The oxide complexes of the invention are prepared by a solid-state reaction procedure which produces an oxide complex having an enhanced superconducting transition temperature compared to an oxide complex of like empirical composition prepared by a coprecipitation&#x2014;high temperature decomposition procedure. With an oxide complex prepared by the solid-state reaction of the invention a transition temperature as high as 100&#xb0;K has been observed even under atmospheric pressure.

Superconductivity in square-planar compound systems

Highly oriented HgBa,Ca,Cu,O,on Ni-tapes with a buffer layer of Cr/Ag or Cr/(Ag&mdash;Pd) have been described with a high transition temperature are described along with, one and two step methods of manufacture.

High temperature superconducting tape and method of manufacture

A material having a superconducting transition temperature (T,) of 126 K under ambient pressure has been identified. The superconducting material belongs to a Ba&mdash;Ca&mdash;Cu&mdash;O compound family where the cation ratio of Ba:Ca:Cu is 2:2.5&plus;0.5:3.5&plusmn;0.5. The superconducting material is produced from precursor oxides having nominal formula Ba,Ca,Cu,O,wherein n&equals;3 or 4 and x is 0.4 to 1.0 and y is 0 to 0.8 using high-pressure synthesis. Final synthesis temperature was maintained at less than 950&deg; C. Formation of the superconducting material is sensitive to the state of the precursor oxides, the carbon content of the precursor, and the synthesis temperature, pressure and time.

Ba-Ca-Cu-O compositions superconducting at up to 126K and methods for making same

A trapped field magnet formed of a high temperature type II superconductor material is disclosed. The trapped field magnet is formed of a plurality of relatively small, single-grain superconductive elements. Optimal shaped of these elements is in a regular truncated cone wherein the half cone angle is 55.degree., and the optimal orientation of each single-grain superconducting elements is an angle of .phi..sub.m with respect to the axis perpendicular to the upper and lower surface of the element, wherein the .phi..sub.m =3 sin .theta. cos .theta./(3 cos.sup.2 .theta.-1) and .theta. determines the location of the element.

Strong high-temperature superconductor trapped field magnets

Highly oriented HgBa.sub.2 Ca.sub.2 Cu.sub.3 O.sub.8+.delta. on Ni-tapes with a buffer layer of Cr/Ag or Cr/(Ag--Pd) have been described with a high transition temperature are described along with, one and two step methods of manufacture.

The present invention is a controlled vapor/solid reaction process for the synthesis of samples of bulk compositions with a structure defined by the homologous series HgBa.sub.2 Ca.sub.n-1 Cu.sub.n O.sub.2n+2+.delta. [Hg-12(n-1)n] with n=2, 3, . . . with up to 75 to 90% Hg-1212 and 65 to 75% Hg-1223 by volume, which display sharp superconducting transitions up to 135 K.

Method for synthesis of high-temperature Hg-Ba-Ca-Cu-O (HBCCO)

A trapped field magnet formed of a high temperature type II superconductor material is disclosed. The trapped field magnet is formed of a plurality of relatively small, single-grain superconductive elements. Optimal shaped of these elements is in a regular truncated cone wherein the half cone angle is 55.degree., and the optimal orientation of each single-grain superconducting elements is an angle of .phi..sub.m with respect to the axis perpendicular to the upper and lower surface of the element, wherein the .phi..sub.m =3 sin.theta.cos.theta./(3 cos.sup.2 .theta.0-1) and .theta. determines the location of the element (FIG. 3a).

Growing community of inventors

Houston, TX, United States of America

Ching-Wu Chu