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Displaying 26 - 50 of 94

Embedded Capacitive Displacement Sensor for Nanopositioning Applications

July 1, 2011
Author(s)
Svetlana Avramov-Zamurovic1, Nicholas Dagalakis, Rae Duk Lee, Jae M. Yoo, Seung H. Yang
The scale of nano objects requires very precise position determination. The state-of-the-art manipulators involve accurate nanometer positioning. The paper presents the design, fabrication process and testing of a capacitance based displacement sensor

Vision Guided Multi-Probe Assembly of 3D Microstructures

October 20, 2010
Author(s)
John D. Wason, John T. Wen, Young M. Choi, Jason J. Gorman, Nicholas Dagalakis
This paper describes the operator assisted automated assembly of a 3-legged spatial platform by using a vision guided multi-probe assembly process. This is the first step towards the ultimate goal of building a microscale active spatial platform. Two

Development of a MEMS based Dynamic Rheometer

August 31, 2010
Author(s)
Gordon Christopher, Jae M. Yoo, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Rheological methods that interrogate nano-liter scale volumes of fluids and solids have advanced considerably over the past decade, yet there remains a need for methods that probe the frequency dependent complex rheological moduli through application of

AFM characterization of nanopositioner in-plane stiffnesses

August 19, 2010
Author(s)
Seung Ho Yang, Yong Sik Kim, Premsagar P. Kavuri, Jae M. Yoo, Young M. Choi, Nicholas G. Dagalakis
A versatile method for measurement of in-plane stiffness of micro-elements was developed and its usefulness has been demonstrated. The in-plane stiffness of a NIST nanopositioner has been measured directly using a colloidal probe in an AFM without any

Embedded Capacitive Displacement Sensor for Nanopositioning Applications

August 17, 2010
Author(s)
Svetlana Avramov-Zamurovic1, Nicholas Dagalakis, Rae Duk Lee, Yong Sik Kim, Jae M. Yoo, Seung H. Yang
The scale of nano objects requires very precise position determination. The state-of-the-art manipulators involve accurate nanometer positioning. This paper presents the design of a capacitive displacement sensor for a nanopositioning application. The

MEMS Parallel Plate Rheometer for Oscillatory Shear Micro Rheology Measurements

December 11, 2009
Author(s)
Gordon Christopher, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Growing numbers of applications including proteomics, cosmetics, and thin film coatings use novel viscoelastic materials that derive their rheological properties from micro scale structure created by the inclusion of long chain molecules, nano particles

Performance of a Nanopositioner Controller Filter Compensator

August 12, 2009
Author(s)
Donna Le, Nicholas Dagalakis, Jason J. Gorman, Jae M. Yoo
We describe the use of appropriate type simple resistor and capacitor (RC) compensators, which properly connected to a power amplifier, can improve the dynamic performance of MEMS nanopositioners. Research on compensators led to the design of several

Design of an on-chip microscale nanoassembly system

February 10, 2009
Author(s)
Jason J. Gorman, Yong Sik Kim, Andras Vladar, Nicholas G. Dagalakis
A microscale nanoassembly system has been designed for the fabrication of nanodevices and in situ electromechanical characterisation of nanostructures. This system consists of four Microelectromechanical Systems(MEMS)-based nanomanipulators positioned

Calibration of a Computer Assisted Orthopedic Hip Surgery Phantom

November 4, 2008
Author(s)
Daniel S. Sawyer, Nicholas G. Dagalakis, Craig M. Shakarji, Yong Sik Kim
Orthopedic surgeons have identified a need for calibration artifacts (phantoms) to establish the traceability (to the SI unit of length) of measurements performed with Computer Assisted Orthopedic Surgery (CAOS) systems. These phantoms must be lightweight

Calibration of a Force Feedback Joystick

August 29, 2008
Author(s)
J H. Daruwalla, Nicholas Dagalakis
The objective of this project was to calibrate a commercially available force feedback joystick that could be used for the control of a laser beam optical tweezers test-bed. A calibration box was built to hold the joystick and the load-cell. The joystick

Metrology and Standards Needs of Some Categories of Medical Devices

April 30, 2008
Author(s)
J C. Chiao, Julian M. Goldman, David A. Heck, Peter Kazanzides, William J. Peine, James B. Stiehl, Dwight Yen, Nicholas Dagalakis
With rapid advances in meso, micro and nano scale technology devices and electronics a new generation of advance medical devices is emerging, which promises less invasive and more accurate, automated and effective medical treatments. We examined the

Multi-Probe Assembly

December 31, 2007
Author(s)
John Wason, William Gressick, J Wen, Jason J. Gorman, Nicholas Dagalakis
This paper describes the algorithm development and experimental results of a multi-probe micro-assembly system. The experimental testbed consists of two actuated probes, an actuated die stage, and vision feedback. The kinematics relationships for the

Control of MEMS Nanopositioners With Nano-Scale Resolution

November 10, 2006
Author(s)
Jason J. Gorman, Yong Sik Kim, Nicholas Dagalakis
Several approaches for the precision control of micro-scale positioning mechanisms, or MEMS nanopositioners, are presented along with initial experimental results which demonstrate nano-scale positioning resolution. The MEMS nanopositioners discussed in

Design of an On-Chip Micro-Scale Nanoassembly System

November 3, 2006
Author(s)
Jason J. Gorman, Yong Sik Kim, Andras Vladar, Nicholas Dagalakis
In this paper, the design and proposed operation of a MEMS-based nanoassembly system is presented. The nanoassembly system is comprised of four nanomanipulators that can work independently or cooperatively. The design of the nanomanipulators will be

Probe-Based Micro-Scale Manipulation and Assembly Using Force Feedback

June 26, 2006
Author(s)
Jason J. Gorman, Nicholas Dagalakis
Repeatable manipulation and assembly of micro-scale components is a critical capability for future developments in opto-electronics, hybrid microelectromechanical systems, and the integration of nano-scale devices into larger systems. This paper focuses on

Three-dimensional Scanning Optical Tweezers

December 5, 2005
Author(s)
Thomas W. LeBrun, T W. Hwang, I Y. Park, Jun-Feng Song, Yong-Gu Lee, Nicholas G. Dagalakis, Cedric V. Gagnon, Arvind K. Balijepalli
There are several new tools for manipulating microscopic objects. Among them, optical tweezers (OT) has two distinguishing advantages. Firstly, OT can easily release an object without the need of a complicated detaching scheme. Secondly, it is anticipated

Analysis and Design of Parallel Mechanisms with Flexure Joints

December 1, 2005
Author(s)
Byoung H. Kang, J Wen, Nicholas Dagalakis, Jason J. Gorman
Flexure joints are frequently used in precision-motion stages and microrobotic mechanisms due to their monolithic construction. The joint compliance, however, can affect the static and dynamic performance of the overall mechanism. In this paper, we

Design and Modeling of Thermally Actuated MEMS Nanopositioners

November 11, 2005
Author(s)
Sebastien Bergna, Jason J. Gorman, Nicholas G. Dagalakis
Several micro-scale nanopositioning mechanisms, or MEMS nanopositioners, have been developed for application in nanotechnology and optical sensors. In this paper, the design and modeling of these devices is presented along with initial experimental results

A Modular System Architecture for Agile Assembly of Nanocomponents using Optical Tweezers

September 10, 2005
Author(s)
Arvind K. Balijepalli, Thomas W. LeBrun, Cedric V. Gagnon, Yong-Gu Lee, Nicholas G. Dagalakis
In order to realize the flexibility optical trapping offers as a nanoassembly tool, we need to develop natural and intuitiveinterfaces to assemble large quantities of nanocomponents quickly and cheaply. We propose a system to create such aninterface that

Design Optimization for a Parallel MEMS Mechanism with Flexure Joints

October 4, 2004
Author(s)
Byoung H. Kang, J Wen, Nicholas Dagalakis, Jason J. Gorman
This paper presents an analysis tool and design method forMEMS parallel mechanisms. Due to processing constraints inMEMS fabrication, flexure joints are frequently used in MEMSmechanisms. Flexure joints offer advantages over other joint designdue to their