@article{oni_hook_maria_lebeau_2014, title={Phase coexistence in Ti6Sn5 intermetallics}, volume={51}, ISSN={["1879-0216"]}, DOI={10.1016/j.intermet.2014.03.002}, abstractNote={Here we report the structural characterization of a complex Ti–Sn intermetallic compound, Ti6Sn5. From X-ray diffraction, the resulting compound was observed to exist in both orthorhombic and hexagonal phases. Analysis by electron microscopy revealed that “planar-like” defects form throughout the material. Atomic resolution aberration-corrected scanning transmission electron microscopy reveals that these “planar-like” defects represent the coexistence of the orthorhombic and hexagonal phases within single grains. The resulting interwoven phases range in thickness from a fraction to multiple unit cells and exhibit coherent phase boundaries with the matrix grain.}, journal={INTERMETALLICS}, author={Oni, A. A. and Hook, D. and Maria, J. P. and LeBeau, J. M.}, year={2014}, month={Aug}, pages={48–52} }
 @inproceedings{hallen_long_hook_pangle_philbrick_2013, title={Multistatic lidar measurements of non-spherical aerosols}, volume={8731}, booktitle={Laser radar technology and applications xviii}, author={Hallen, H. D. and Long, B. J. N. and Hook, D. A. and Pangle, G. E. and Philbrick, C. R.}, year={2013} }
 @inproceedings{pangle_hook_long_philbrick_hallen_2013, title={Optical extinction dependence on wavelength and size distribution of airborne dust}, volume={8731}, booktitle={Laser radar technology and applications xviii}, author={Pangle, G. E. and Hook, D. A. and Long, B. J. N. and Philbrick, C. R. and Hallen, H. D.}, year={2013} }
 @inproceedings{hook_pangle_long_philbrick_hallen_2013, title={Understanding lidar returns from complex dust mixtures}, volume={8731}, booktitle={Laser radar technology and applications xviii}, author={Hook, D. A. and Pangle, G. E. and Long, B. J. N. and Philbrick, C. R. and Hallen, H. D.}, year={2013} }
 @inproceedings{long_hook_pangle_hallen_philbrick_2013, title={Using a laser aureole to study aerosols}, volume={8731}, booktitle={Laser radar technology and applications xviii}, author={Long, B. J. N. and Hook, D. A. and Pangle, G. E. and Hallen, H. D. and Philbrick, C. R.}, year={2013} }
 @article{hook_ohlhausen_krim_dugger_2010, title={Evaluation of Oxygen Plasma and UV Ozone Methods for Cleaning of Occluded Areas in MEMS Devices}, volume={19}, ISSN={["1941-0158"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-78649673539&partnerID=MN8TOARS}, DOI={10.1109/jmems.2010.2067193}, abstractNote={UV ozone and oxygen plasma treatments are two common procedures for cleaning silicon surfaces. The extent to which hidden surfaces of microelectromechanical systems (MEMS) are cleaned by these methods has not been well documented. To probe and compare the effectiveness of the two methods for cleaning occluded regions in MEMS, devices consisting of large movable flaps were fabricated to produce hidden surfaces whose occluded regions exceeded the aspect ratios that typically occur in MEMS devices. The gaps between the flap and the substrate in the custom flap devices were designed to be variable in extent. Their interior regions were initially coated with chemisorbed monolayers and then subjected to cleaning. Both techniques removed monolayers on exposed surfaces and both, to some extent, removed monolayers present on the occluded surfaces. Oxygen plasma was found to be a far more effective method for cleaning the occluded surfaces than the UV ozone method. However, in occlusions with exceptionally large aspect ratios of 1700 : 1, even oxygen plasma could not remove all traces of the chemisorbed monolayers.}, number={6}, journal={JOURNAL OF MICROELECTROMECHANICAL SYSTEMS}, author={Hook, D. Adam and Ohlhausen, James A. and Krim, Jacqueline and Dugger, Michael T.}, year={2010}, month={Dec}, pages={1292–1298} }
 @article{timpe_alsem_hook_dugger_komvopoulos_2009, title={Wear of Polysilicon Surface Micromachines Operated in High Vacuum}, volume={18}, ISSN={["1941-0158"]}, DOI={10.1109/JMEMS.2008.2010851}, abstractNote={The evolution of wear at sidewall surfaces of polysilicon microelectromechanical systems was investigated in high vacuum under controlled normal load and sliding speed conditions. The static adhesion force was used as an indicator of the changes in wear characteristics occurring during oscillatory sliding contact. Measurements of the static adhesion force as a function of sliding cycles and scanning electron microscopy observations of micromachines from the same batch process subjected to nominally identical testing conditions revealed two distinctly different tribological patterns, namely, low-adhesion/high-wear behavior and high-adhesion/low-wear behavior. The static adhesion force and wear behavior were found to be in direct correlation with the micromachine operational lifetime. Transmission electron microscopy, selected area diffraction, and energy dispersive X-ray spectroscopy yielded insight into the origin, microstructure, and composition of wear debris and agglomerates adhered onto the sliding surfaces. Results demonstrate a strong dependence of micromachine operational life on the removal of the native oxide film and the organic monolayer coating as well as the formation of agglomerates consisting of organic coating material and wear debris.}, number={2}, journal={JOURNAL OF MICROELECTROMECHANICAL SYSTEMS}, author={Timpe, Shannon J. and Alsem, Daan Hein and Hook, D. Adam and Dugger, Michael T. and Komvopoulos, Kyriakos}, year={2009}, month={Apr}, pages={229–238} }
 @article{timpe_hook_dugger_komvopoulos_2008, title={Levitation compensation method for dynamic electrostatic comb-drive actuators}, volume={143}, ISSN={["0924-4247"]}, DOI={10.1016/j.sna.2007.11.025}, abstractNote={An analytical method was developed for maintaining a constant levitation height during dynamic operation of reciprocating comb-drive actuators. The dependence of the translational position and the levitation height on the applied voltage was used to design waveforms that maintain a given translational motion without altering the levitation height. An experimental protocol was established for determining the necessary geometric factors of a particular comb-drive design, which were then used to generate constant-velocity levitation waveforms. The analytical model was tested experimentally by examining the levitation and translation positions of a surface micromachine under both compensated and uncompensated signals. A significant reduction in the range of levitation was obtained over the entire amplitude of the oscillatory motion, while the translational motion remained relatively unchanged. Design and fabrication effects on the compensated levitation height of an oscillating surface micromachine are discussed in the context of analytical and experimental results.}, number={2}, journal={SENSORS AND ACTUATORS A-PHYSICAL}, author={Timpe, S. J. and Hook, D. A. and Dugger, M. T. and Komvopoulos, K.}, year={2008}, month={May}, pages={383–389} }
 @article{hook_timpe_dugger_krim_2008, title={Tribological degradation of fluorocarbon coated silicon microdevice surfaces in normal and sliding contact}, volume={104}, number={3}, journal={Journal of Applied Physics}, author={Hook, D. A. and Timpe, S. J. and Dugger, M. T. and Krim, J.}, year={2008} }