Dr. Feng Qian Profile

Dr. Feng Qian

at Rice Univ

SPIE Involvement:

Author

Publications (23)

Proceedings Article | 21 February 2006 Paper

Optical trapping investigation on the effects of salicylate on electromechanical properties of plasma membranes

Linda Lee, Feng Qian, William Brownell, Bahman Anvari

Proceedings Volume 6088, 60881A (2006) https://doi.org/10.1117/12.646130

KEYWORDS: Optical tweezers, Plasma, Mirrors, Proteins, Cytoskeletons, Axons, Electrodes, CCD cameras, Optical amplifiers, Microscopes

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SPIE Journal Paper | 1 December 2005

Efficient two-step digit-set-restricted modified signed-digit algorithm based on optoelectronic shared content-addressable memory

Feng Qian, Guoqiang Li, Mohammad Karim

OE, Vol. 44, Issue 12, 125201, (December 2005) https://doi.org/10.1117/12.10.1117/1.2148920

KEYWORDS: Optoelectronics, Content addressable memory, Optical correlators, Spatial light modulators, Lithium, Optical engineering, Symbolic substitution, Algorithm development, Computer programming, LCDs

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Proceedings Article | 18 October 2004 Paper

Effect of ionic strength on electrically evoked membrane tether force: an optical tweezers study

Feng Qian, William Brownell, Bahman Anvari

Proceedings Volume 5514, (2004) https://doi.org/10.1117/12.560021

KEYWORDS: Optical tweezers, Plasma, Mirrors, Optical amplifiers, Electromyography, Tunable lasers, Kidney, Sensors, Microscopes, Beam splitters

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Proceedings Article | 18 October 2004 Paper

Measurements of cell wall mechanical properties using optically trapped fluorescent microspheres

Sergey Ermilov, Feng Qian, David Murdock, William Brownell, Bahman Anvari

Proceedings Volume 5514, (2004) https://doi.org/10.1117/12.559717

KEYWORDS: Phase modulation, Plasma, Optical tweezers, Luminescence, Ferroelectric materials, Mechanics, Visualization, Bandpass filters, Imaging systems, Cytoskeletons

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Information on plasma membrane (PM) and cell wall mechanical properties is important for many biophysical applications, especially for those, which involve cells, undergoing significant mechanical stress (red blood cells, outer hair cells, fibrocytes, etc.). Optical tweezers is frequently used to study PM mechanics, particularly by pulling long PM tethers. One of the limitations on using optical tweezers to study cell wall mechanics is associated with transillumination technique of the trapped object position sensing, which prevents accurate mechanical testing in the proximity to the cell. In this work we use an optical tweezers in conjunction with a position-sensing system, which spectrally separates signals from the trapped fluorescent microsphere and imaging background. We have used this setup to study mechanics of the cell wall and PM separated from the underlying cytoskeleton on human embryonic kidney cells. We measured the force exerted by the cell on the trapped microsphere as a function of the cell wall displacement during the process of tether formation, and as a function of time during the process of tether growth and relaxation. Tethering force - cell wall displacement profiles have shown a behavior, implying that tether formation process starts with elastic deformation of the intact cell wall, followed by the plastic deformations and sliding of the PM over the underlying cytoskeleton, and ends with the local separation of a PM. Tethering force - cell wall displacement profiles have been used to estimate tether formation force, stiffness parameter of the cell wall and the works of tether formation, elastic and plastic deformations of the cell wall, related to the mechanical properties of a composite cell wall and cell wall - plasma membrane association strength. Temporal steady-state and relaxation tethering force profiles have been similar to the ones measured using transillumination position sensing, however average force values have been smaller in our case, due to the methodological differences. Our results demonstrate that measurements of cell wall and PM mechanical properties using optically-trapped fluorescent microspheres presents a versatile technology for studying of the cellular mechanics, especially effective in the proximity of the trapped microsphere to the cell.

Proceedings Article | 1 June 2004 Paper

Optical tweezers study of viscoelastic properties in the outer hair cell plasma membrane

David Murdock, Sergey Ermilov, Feng Qian, William Brownell, Bahman Anvari

Proceedings Volume 5331, (2004) https://doi.org/10.1117/12.529597

KEYWORDS: Plasma, Optical tweezers, Photodetectors, Data modeling, Neodymium, Phase modulation, Cytoskeletons, Mechanics, Calibration, Molecules

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Proceedings Article | 1 June 2004 Paper

Membrane tether formation from voltage-clamped outer hair cells using optical tweezers

Feng Qian, Sergey Ermilov, David Murdock, William Brownell, Bahman Anvari

Proceedings Volume 5331, (2004) https://doi.org/10.1117/12.528540

KEYWORDS: Optical tweezers, Plasma, Luminescence, Mirrors, Calibration, Electromechanical design, Photodetectors, Optical amplifiers, Objectives, Microscopes

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Proceedings Article | 12 December 2003 Paper

Digit-set-restricted modified signed-digit arithmetic based on optoelectronic shared content-addressable memory

Feng Qian, Guoqiang Li, Mohammad Alam, Mohammad Karim

Proceedings Volume 5201, (2003) https://doi.org/10.1117/12.505917

KEYWORDS: Binary data, Photography, Spatial light modulators, Symbolic substitution, Lithium, Computer programming, Holograms, Optical correlators, Content addressable memory, Optoelectronics

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SPIE Journal Paper | 1 October 2002

One-step digit-set-restricted modified signed-digit adder using an incoherent correlator based on a shared content-addressable memory

Feng Qian, Guoqiang Li, Mohammad Alam

OE, Vol. 41, Issue 10, (October 2002) https://doi.org/10.1117/12.10.1117/1.1505037

KEYWORDS: Content addressable memory, Optoelectronics, Optical correlators, Lithium, Symbolic substitution, Algorithm development, Computer programming, Optical engineering, Holograms, Binary data

Proceedings Article | 20 September 2002 Paper

Simulated annealing algorithm for unwrapping noisy phase map

Zhenjun Peng, Xiangzhao Wang, Feng Qian, Xuefeng Wang, Xianghong Zhong

Proceedings Volume 4927, (2002) https://doi.org/10.1117/12.464028

KEYWORDS: Algorithms, Numerical simulations, Phase interferometry, Algorithm development, Mirrors, Annealing, Phase shifts, Mechanics, Interferometry, Optical interferometry

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Proceedings Article | 20 September 2002 Paper

Unwrapping phase map by estimating regions containing phase jumps

Feng Qian, Xiangzhao Wang, Zhenjun Peng, Xuefeng Wang

Proceedings Volume 4927, (2002) https://doi.org/10.1117/12.471440

KEYWORDS: Digital filtering, Image processing, Phase shift keying, Binary data, Computer simulations, Phase compensation, Nonlinear filtering, Modulation, Phase interferometry, Interferometry

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Proceedings Article | 6 December 2001 Paper

Generalized look-ahead number conversion from signed digit to complement representation with optical logic operations

Feng Qian, Guoqiang Li

Proceedings Volume 4470, (2001) https://doi.org/10.1117/12.449664

KEYWORDS: Logic, Binary data, Computer programming, Algorithm development, Optical logic, Computing systems, Computer architecture, Optoelectronics, Ions, Optical arrays

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SPIE Journal Paper | 1 November 2001

Code conversion from signed-digit to complement representation based on look-ahead optical logic operations

Guoqiang Li, Feng Qian

OE, Vol. 40, Issue 11, (November 2001) https://doi.org/10.1117/12.10.1117/1.1408315

KEYWORDS: Logic, Binary data, Computer programming, Spatial light modulators, Optical logic, Optoelectronics, Optical arrays, Optical engineering, Data conversion, Array processing

Proceedings Article | 16 October 2001 Paper

Intensity-modulating characteristics of a laser diode subject to optical injection

Xiangzhao Wang, Hongbin Lu, Xuefeng Wang, Feng Qian, Danyang Yu, Zujie Fang

Proceedings Volume 4602, (2001) https://doi.org/10.1117/12.445713

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Proceedings Article | 15 October 2001 Paper

Phase-shifting profilometer for measurement of the physical parameters of the fiber connector endface

Feng Qian, Xiangzhao Wang, Xuefeng Wang

Proceedings Volume 4601, (2001) https://doi.org/10.1117/12.444740

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SPIE Journal Paper | 1 February 2001

Optoelectronic quotient-selected modified signed-digit division

Feng Qian, Guoqiang Li, Mohammad Alam

OE, Vol. 40, Issue 02, (February 2001) https://doi.org/10.1117/12.10.1117/1.1336524

KEYWORDS: Optoelectronics, Logic, Binary data, Computing systems, Spatial light modulators, Lithium, Symbolic substitution, Algorithm development, Optical computing, Computer programming

Proceedings Article | 29 November 2000 Paper

Quotient-selected modified signed-digit division algorithm and its optoelectronic implementations

Feng Qian, Guoqiang Li, Mohammad Alam

Proceedings Volume 4114, (2000) https://doi.org/10.1117/12.408549

KEYWORDS: Optoelectronics, Logic, Spatial light modulators, Binary data, Beam splitters, Algorithm development, Optical computing, Computing systems, Symbolic substitution, Content addressable memory

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Proceedings Article | 6 October 2000 Paper

Choice of modulation parameters in photothermal-modulation laser diode interferometer

Xianzhao Wang, Hongbin Lu, Xuefeng Wang, Danyang Yu, Feng Qian, Gaoting Chen, Zujie Fang

Proceedings Volume 4231, (2000) https://doi.org/10.1117/12.402835

KEYWORDS: Modulation, Interferometers, Semiconductor lasers, Light sources, Optical testing, Temperature metrology, Photothermal effect, Mirrors, Light, Beam splitters

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Proceedings Article | 1 October 1999 Paper

Compact two-step parallel modified-signed-digit adder/substractor based on binary logic operations using electron-trapping devices

Guoqiang Li, Feng Qian, Hao Ruan, Liren Liu

Proceedings Volume 3805, (1999) https://doi.org/10.1117/12.364005

KEYWORDS: Logic, Binary data, Spatial light modulators, Array processing, Optoelectronics, Computer programming, Polarization, Electro optics, Infrared radiation, Signal to noise ratio

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Proceedings Article | 1 October 1999 Paper

Optical complex-valued modular multiplication based on digital partitioning

Huiquan Cheng, Liren Liu, Guoqiang Li, Feng Qian

Proceedings Volume 3805, (1999) https://doi.org/10.1117/12.364006

KEYWORDS: Convolution, Reconstruction algorithms, Computer programming, Optical signal processing, Electronic components, Optical computing, Computing systems, Binary data, Photography, Optical correlators

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Proceedings Article | 1 October 1999 Paper

Optical look-ahead-mode conversion from modified signed digit to 2's complement representation

Feng Qian, Guoqiang Li, Hao Ruan, Liren Liu

Proceedings Volume 3805, (1999) https://doi.org/10.1117/12.364004

KEYWORDS: Binary data, Logic, Computer programming, Spatial light modulators, Camera shutters, Electronic components, Optoelectronics, Optical computing, Computing systems, Charge-coupled devices

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Proceedings Article | 20 September 1999 Paper

Gray-scale image fidelity and enhancement in photorefractive volume memory recorded with a pulsed signal beam

Guoqiang Li, Feng Qian, Jianlang Li, Liren Liu

Proceedings Volume 3801, (1999) https://doi.org/10.1117/12.363941

KEYWORDS: Image enhancement, Holograms, Crystals, Volume holography, Diffraction gratings, Laser crystals, Diffraction, Image acquisition, Silicon, Image restoration

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Proceedings Article | 19 July 1999 Paper

Efficient optical negabinary signed-digit arithmetic operations and implementation using electron-trapping device

Guoqiang Li, Feng Qian, Hao Ruan, Liren Liu

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.354748

KEYWORDS: Binary data, Logic, Computer programming, Optoelectronics, Optoelectronic devices, Algorithm development, Array processing, Lithium, Mechanics, Symbolic substitution

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SPIE Journal Paper | 1 March 1999

Parallel optical negabinary signed-digit computing: algorithm and optical implementation

Guoqiang Li, Feng Qian, Hao Ruan, Liren Liu

OE, Vol. 38, Issue 03, (March 1999) https://doi.org/10.1117/12.10.1117/1.602116

KEYWORDS: Logic, Binary data, Computer programming, Algorithm development, Optical engineering, Spatial light modulators, Optical computing, Computing systems, Symbolic substitution, Content addressable memory

Showing 5 of 23 publications

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