Jing Li

US Patent:

6614851, Sep 2, 2003

Filed:

Jul 14, 2000

Appl. No.:

09/615890

Inventors:

Hossein Dehghan - Danville CA
Ramon A. Cruz - Fremont CA
Jing Li - San Jose CA

Assignee:

LSI Logic Corporation - Milpitas CA

International Classification:

H04L 512

US Classification:

375261, 375264, 375353

Abstract:

A method for determining the signal constellation of a received signal establishes a moment based on each waveform, squares the moment, fourth powers the moment, divides the fourth power by the square to obtain a ratio, and compares the ratio to a threshold. If the ratio is less than threshold, the signal constellation corresponds to a first type, and if greater than the threshold, the signal constellation corresponds to a second type. The method can be generalized to a magnitude mean in place of a second moment.

US Patent:

7426848, Sep 23, 2008

Filed:

Aug 5, 2005

Appl. No.:

11/203576

Inventors:

Jing Li - San Jose CA, US
Meyya Meyyappan - San Jose CA, US

Assignee:

United States of America as Represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

G01N 7/00

US Classification:

73 232, 73 3105

Abstract:

A method and system for estimating one, two or more unknown components in a gas. A first array of spaced apart carbon nanotubes (“CNTs”) is connected to a variable pulse voltage source at a first end of at least one of the CNTs. A second end of the at least one CNT is provided with a relatively sharp tip and is located at a distance within a selected range of a constant voltage plate. A sequence of voltage pulses {V(t)}at times t=t(n=1,. . . , N N3) is applied to the at least one CNT, and a pulse discharge breakdown threshold voltage is estimated for one or more gas components, from an analysis of a curve I(t) for current or a curve e(t) for electric charge transported from the at least one CNT to the constant voltage plate. Each estimated pulse discharge breakdown threshold voltage is compared with known threshold voltages for candidate gas components to estimate whether at least one candidate gas component is present in the gas. The procedure can be repeated at higher pulse voltages to estimate a pulse discharge breakdown threshold voltage for a second component present in the gas.

US Patent:

7529633, May 5, 2009

Filed:

Aug 5, 2005

Appl. No.:

11/203589

Inventors:

John F. Schipper - Palo Alto CA, US
Jing Li - San Jose CA, US

Assignee:

The United States of America as represented by the National Aeronautics and Space Administration (NASA) - Washington DC

International Classification:

G01N 33/00
G06F 17/00

US Classification:

702 50, 702 22, 702 24, 702 30, 702 32, 977839

Abstract:

Method and system for determining chemical composition of a single-component or multiple-component gas, using a discharge holdoff mechanism. A voltage difference V between two spaced apart electrodes is brought to a selected value and held, the holdoff time interval Δt(V;ho) required before gas discharge occurs is measured, and the associated electrical current or cumulative electrical charge is measured. As the voltage difference V increases, the time interval length Δt(V;ho) decreases monotonically. Particular voltage values, Vand V, correspond to initial appearance of discharge (Δt≈∞) and prompt discharge (Δt≈0). The values Vand Vand the rate of decrease of Δt(V;ho) and/or the rate of increase of current or cumulative charge with increasing V are characteristic of one or more gas components present.

US Patent:

7623972, Nov 24, 2009

Filed:

Oct 31, 2006

Appl. No.:

11/591630

Inventors:

Jing Li - San Jose CA, US
Meyya Meyyappan - San Jose CA, US
Yijiang Lu - San Jose CA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

G01N 31/00
G01N 27/00
G06F 19/00

US Classification:

702 27, 422 83, 977953, 977957

Abstract:

Methods and systems for determining if one or more target molecules are present in a gas, by exposing a functionalized carbon nanostructure (CNS) to the gas and measuring an electrical parameter value EPV(n) associated with each of N CNS sub-arrays. In a first embodiment, a most-probable concentration value C(opt) is estimated, and an error value, depending upon differences between the measured values EPV(n) and corresponding values EPV(n;C(opt)) is computed. If the error value is less than a first error threshold value, the system interprets this as indicating that the target molecule is present in a concentration C≈C(opt). A second embodiment uses extensive statistical and vector space analysis to estimate target molecule concentration.

US Patent:

7801687, Sep 21, 2010

Filed:

Jul 8, 2005

Appl. No.:

11/178079

Inventors:

Jing Li - San Jose CA, US
Meyya Meyyappan - San Jose CA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (NASA) - Washington DC

International Classification:

G01N 31/00

US Classification:

702 22, 702 23, 702 24, 702 27, 702 30, 702 32, 422 83, 422 98, 436149, 73 232, 73 2321, 977920, 977921, 977922, 977938

Abstract:

Methods for using modified single wall carbon nanotubes (“SWCNTs”) to detect presence and/or concentration of a gas component, such as a halogen (e. g. , Cl), hydrogen halides (e. g. , HCl), a hydrocarbon (e. g. , CH), an alcohol, an aldehyde or a ketone, to which an unmodified SWCNT is substantially non-reactive. In a first embodiment, a connected network of SWCNTs is coated with a selected polymer, such as chlorosulfonated polyethylene, hydroxypropyl cellulose, polystyrene and/or polyvinylalcohol, and change in an electrical parameter or response value (e. g. , conductance, current, voltage difference or resistance) of the coated versus uncoated SWCNT networks is analyzed. In a second embodiment, the network is doped with a transition element, such as Pd, Pt, Rh, Ir, Ru, Os and/or Au, and change in an electrical parameter value is again analyzed. The parameter change value depends monotonically, not necessarily linearly, upon concentration of the gas component. Two general algorithms are presented for estimating concentration value(s), or upper or lower concentration bounds on such values, from measured differences of response values.

US Patent:

7875455, Jan 25, 2011

Filed:

Jul 12, 2006

Appl. No.:

11/489803

Inventors:

Jing Li - San Jose CA, US
Meyya Meyyappan - San Jose CA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (NASA) - Washington DC

International Classification:

G01N 33/24
G01N 27/06
G01N 25/00
G01N 7/00
G01N 27/04

US Classification:

436 28, 422 8202, 422 8212, 422 8213, 422 98, 436 29, 977957

Abstract:

A method and system for evaluating status and response of a mineral-producing field (e. g. , oil and/or gas) by monitoring selected chemical and physical properties in or adjacent to a wellsite headspace. Nanotechnology sensors and other sensors are provided for one or more underground (fluid) mineral-producing wellsites to determine presence/absence of each of two or more target molecules in the fluid, relative humidity, temperature and/or fluid pressure adjacent to the wellsite and flow direction and flow velocity for the fluid. A nanosensor measures an electrical parameter value and estimates a corresponding environmental parameter value, such as water content or hydrocarbon content. The system is small enough to be located down-hole in each mineral-producing horizon for the wellsite.

US Patent:

7968054, Jun 28, 2011

Filed:

Mar 7, 2007

Appl. No.:

11/715785

Inventors:

Jing Li - San Jose CA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (NASA) - Washington DC

International Classification:

G01N 7/00
G01N 33/48
G01N 27/00
G01N 31/00
G01N 19/00

US Classification:

422 83, 422 681, 422 98, 702 22, 702 23, 702 27, 702 30, 977953, 977957, 977742, 977842

Abstract:

A system for receiving, analyzing and communicating results of sensing chemical and/or physical parameter values, using wireless transmission of the data. Presence or absence of one or more of a group of selected chemicals in a gas or vapor is determined, using suitably functionalized carbon nanostructures that are exposed to the gas. One or more physical parameter values, such as temperature, vapor pressure, relative humidity and distance from a reference location, are also sensed for the gas, using nanostructures and/or microstructures. All parameter values are transmitted wirelessly to a data processing site or to a control site, using an interleaving pattern for data received from different sensor groups, using I. E. E. E. 802. 11 or 802. 15 protocol, for example. Methods for estimating chemical concentration are discussed.

US Patent:

8000903, Aug 16, 2011

Filed:

Apr 28, 2006

Appl. No.:

11/416505

Inventors:

Jing Li - San Jose CA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Asministration (NASA) - Washington DC

International Classification:

G01N 31/00

US Classification:

702 22, 702 23, 702 24, 702 27, 702 30, 702 32, 422 83, 422 98, 436149, 73 232, 73 2321, 977920, 977921, 977922, 977938

Abstract:

Methods for using modified single wall carbon nanotubes (“SWCNTs”) to detect presence and/or concentration of a gas component, such as a halogen (e. g. , Cl), hydrogen halides (e. g. , HCl), a hydrocarbon (e. g. , CH), an alcohol, an aldehyde or a ketone, to which an unmodified SWCNT is substantially non-reactive. In a first embodiment, a connected network of SWCNTs is coated with a selected polymer, such as chlorosulfonated polyethylene, hydroxypropyl cellulose, polystyrene and/or polyvinylalcohol, and change in an electrical parameter or response value (e. g. , conductance, current, voltage difference or resistance) of the coated versus uncoated SWCNT networks is analyzed. In a second embodiment, the network is doped with a transition element, such as Pd, Pt, Rh, Ir, Ru, Os and/or Au, and change in an electrical parameter value is again analyzed. The parameter change value depends monotonically, not necessarily linearly, upon concentration of the gas component. Two general algorithms are presented for estimating concentration value(s), or upper or lower concentration bounds on such values, from measured differences of response values.