Jian Xu

US Patent:

6683513, Jan 27, 2004

Filed:

Oct 24, 2001

Appl. No.:

10/000471

Inventors:

Khosro Shamsaifar - Ellicott City MD
Jian Xu - Clarksville MD

Assignee:

Paratek Microwave, Inc. - Columbia MD

International Classification:

H01P 1213

US Classification:

333135, 333209

Abstract:

A diplexer includes a first tunable bandpass filter connected to a first port, a second tunable bandpass filter connected to a second port, and a coupling element for coupling the first bandpass filter and the second bandpass filter to a third port. Each of the tunable bandpass filters includes a tunable capacitor, wherein a control signal applied to the tunable capacitor controls the transmission characteristic of the filter. The tunable capacitor can be a tunable dielectric varactor or a microelectromechanical variable capacitor. The coupling element can include one of: a circulator, a T-junction, and an orthomode transducer. Each of the first and second filters can comprise a fin line filter including a plurality of tunable dielectric capacitors mounted within a waveguide for controlling the filter transmission characteristics. Fixed bandpass filters can be inserted between each of the tunable bandpass filters and the coupling element.

US Patent:

7437464, Oct 14, 2008

Filed:

Jan 31, 2003

Appl. No.:

10/355264

Inventors:

Jian Xu - Herndon VA, US
Chung-Wen Yuan - North Potomac MD, US

Assignee:

Federal Home Loan Mortgage Corporation - McLean VA

International Classification:

G06F 15/16

US Classification:

709227, 709228, 709229

Abstract:

Systems and methods are provided for providing asynchronous communication between a source processor and a destination processor. In one embodiment, a method includes receiving an information request; making a first call to the destination processor, such that the first call includes the information request; and ending the first call while the destination processor determines an information response, such that said ending terminates a synchronous communication between the source processor and the destination processor. Furthermore, the method includes making a second call to the source processor, such that the second call includes the information response; ending the second call, such that said ending terminates a synchronous communication between the destination processor and the source processor; and providing asynchronously the information response.

US Patent:

20220177331, Jun 9, 2022

Filed:

Feb 25, 2022

Appl. No.:

17/681581

Inventors:

- Hoboken NJ, US
Ronald Besser - New Providence NJ, US
Jian Xu - West Lafayette IN, US
Wei Xu - Farmingdale NY, US
Brendan Englot - New York NY, US
Chang-Hwan Choi - Tenafly NJ, US

Assignee:

THE TRUSTEES OF THE STEVENS INSTITUTE OF TECHNOLOGY - Hoboken NJ

International Classification:

C02F 1/40
C02F 1/28

Abstract:

Smart membranes are integrated into a small, unmanned surface vessel to enable the efficient, automated cleanup of oil spills. Such a vessel has the potential to provide a low-cost, modular solution for day-to-day oil-spill cleanup operations, especially in confined aquatic areas (e.g., under piers or in the small spaces between marine vessels and piers). The membranes are provided on the surface of a conveyor belt that circulates the membranes through the surrounding body of water for oil collection, as well as through an internal reduction chamber of the vessel for oil release. The smart membranes are adapted to attract and repel oil in response to low-voltage commands applied across the conveyor belt, using a process that is repeatable for a number of cycles, offering high efficiency and long durability. Segments of the conveyor belt can be electrically isolated from one another to allow disparate electrical potentials to be imposed thereon.

US Patent:

20230025974, Jan 26, 2023

Filed:

Aug 4, 2022

Appl. No.:

17/881406

Inventors:

- Hoboken NJ, US
Jian Xu - West Lafayette IN, US
Wei Xu - Farmingdale NY, US
Brendan Englot - New York NY, US
Chang-Hwan Choi - Tenafly NJ, US

Assignee:

THE TRUSTEES OF THE STEVENS INSTITUTE OF TECHNOLOGY - Hoboken NJ

International Classification:

C02F 1/40
C02F 1/28

Abstract:

Smart membranes () are integrated into a small, unmanned surface vessel () to enable the efficient, automated cleanup of oil spills. Such a vessel () has the potential to provide a low-cost, modular solution for day-to-day oil-spill cleanup operations, especially in confined aquatic areas, such as under piers and in the small spaces between marine vessels and piers. The smart membranes () are provided on the surface of a conveyor belt () that circulates the membranes () through the surrounding body of water () for oil collection, as well as through an internal reduction chamber () of the vessel () for oil release. The smart membranes () are adapted to attract and repel oil () in response to low-voltage commands applied across the conveyor belt (), using a process that is repeatable for a number of cycles, offering high efficiency and long durability (FIG. ).

US Patent:

20200331776, Oct 22, 2020

Filed:

Dec 4, 2018

Appl. No.:

16/766066

Inventors:

- Hoboken NJ, US
Jian Xu - West Lafayette IN, US
Wei Xu - Farmingdale NY, US
Brendan Englot - New York NY, US
Chang-Hwan Choi - Tenafly NJ, US

Assignee:

THE TRUSTEES OF THE STEVENS INSTITUTE OF TECHNOLOGY - Hoboken NJ

International Classification:

C02F 1/40
C02F 1/28

Abstract:

Smart membranes () are integrated into a small, unmanned surface vessel () to enable the efficient, automated cleanup of oil spills. Such a vessel () has the potential to provide a low-cost, modular solution for day-to-day oil-spill cleanup operations, especially in confined aquatic areas, such as under piers and in the small spaces between marine vessels and piers. The smart membranes () are provided on the surface of a conveyor belt () that circulates the membranes () through the surrounding body of water () for oil collection, as well as through an internal reduction chamber () of the vessel () for oil release. The smart membranes () are adapted to attract and repel oil () in response to low-voltage commands applied across the conveyor belt (), using a process that is repeatable for a number of cycles, offering high efficiency and long durability (FIG. ).