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Browsing by Subject "Equipment Design"
Now showing items 1-20 of 44
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16-Channel biphasic current-mode programmable charge balanced neural stimulation.
(Biomedical engineering online, 2017-08)<h4>Background</h4>Neural stimulation is an important method used to activate or inhibit action potentials of the neuronal anatomical targets found in the brain, central nerve and peripheral nerve. The neural stimulator ... -
A screw microdrive for adjustable chronic unit recording in monkeys.
(J Neurosci Methods, 1998-06-01)A screw microdrive is described that attaches to the grid system used for recording single neurons from brains of awake behaving monkeys. Multiple screwdrives can be mounted on a grid over a single cranial opening. This ... -
A versatile diffractive maskless lithography for single-shot and serial microfabrication.
(Opt Express, 2010-05-24)We demonstrate a diffractive maskless lithographic system that is capable of rapidly performing both serial and single-shot micropatterning. Utilizing the diffractive properties of phase holograms displayed on a spatial ... -
Accelerating self-consistent field convergence with the augmented Roothaan-Hall energy function.
(J Chem Phys, 2010-02-07)Based on Pulay's direct inversion iterative subspace (DIIS) approach, we present a method to accelerate self-consistent field (SCF) convergence. In this method, the quadratic augmented Roothaan-Hall (ARH) energy function, ... -
Characterizing the Switching Thresholds of Magnetophoretic Transistors.
(Adv Mater, 2015-10-28)The switching thresholds of magnetophoretic transistors for sorting cells in microfluidic environments are characterized. The transistor operating conditions require short 20-30 mA pulses of electrical current. By demonstrating ... -
Circuit topology and control principle for a first magnetic stimulator with fully controllable waveform.
(Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2012-01)Magnetic stimulation pulse sources are very inflexible high-power devices. The incorporated circuit topology is usually limited to a single pulse type. However, experimental and theoretical work shows that more freedom in ... -
Clinical assessment and characterization of a dual tube kilovoltage X-ray localization system in the radiotherapy treatment room.
(Journal of applied clinical medical physics, 2008-01-13)INTRODUCTION:Although flat-panel based X-ray imaging has been well tested in diagnostic radiology, its use as an image-guided-radiotherapy (IGRT) system in a treatment room is new and requires systematic assessment. MATERIALS ... -
Closed-loop systems in anesthesia: reality or fantasy?
(Anesth Analg, 2013-11) -
CMOS-based carbon nanotube pass-transistor logic integrated circuits.
(Nature communications, 2012-02)Field-effect transistors based on carbon nanotubes have been shown to be faster and less energy consuming than their silicon counterparts. However, ensuring these advantages are maintained for integrated circuits is a challenge. ... -
Coded aperture compressive temporal imaging.
(Opt Express, 2013-05-06)We use mechanical translation of a coded aperture for code division multiple access compression of video. We discuss the compressed video's temporal resolution and present experimental results for reconstructions of > 10 ... -
Complex k band diagrams of 3D metamaterial/photonic crystals.
(Opt Express, 2011-09-26)A finite element method (FEM) for solving a complex valued k(ω) vs. ω dispersion curve of a 3D metamaterial/photonic crystal system is presented. This 3D method is a generalization of a previously reported 2D eigenvalue ... -
Compressive holography.
(2012)Compressive holography estimates images from incomplete data by using sparsity priors. Compressive holography combines digital holography and compressive sensing. Digital holography consists of computational image estimation ... -
Computed tomography dose index and dose length product for cone-beam CT: Monte Carlo simulations.
(Journal of applied clinical medical physics, 2011-01-19)Dosimetry in kilovoltage cone beam computed tomography (CBCT) is a challenge due to the limitation of physical measurements. To address this, we used a Monte Carlo (MC) method to estimate the CT dose index (CTDI) and the ... -
Delivery efficiency of an Elekta linac under gated operation.
(Journal of applied clinical medical physics, 2014-09-08)In this study, we have characterized the efficiency of an Elekta linac in the delivery of gated radiotherapy. We have explored techniques to reduce the beam-on delay and to improve the delivery efficiency, and have investigated ... -
Design and in vivo evaluation of more efficient and selective deep brain stimulation electrodes.
(Journal of neural engineering, 2015-08)<h4>Objective</h4>Deep brain stimulation (DBS) is an effective treatment for movement disorders and a promising therapy for treating epilepsy and psychiatric disorders. Despite its clinical success, the efficiency and selectivity ... -
Design of a Novel Low Cost Point of Care Tampon (POCkeT) Colposcope for Use in Resource Limited Settings.
(PLoS One, 2015)INTRODUCTION: Current guidelines by WHO for cervical cancer screening in low- and middle-income countries involves visual inspection with acetic acid (VIA) of the cervix, followed by treatment during the same visit or a ... -
Effect of lithotripter focal width on stone comminution in shock wave lithotripsy.
(J Acoust Soc Am, 2010-04)Using a reflector insert, the original HM-3 lithotripter field at 20 kV was altered significantly with the peak positive pressure (p(+)) in the focal plane increased from 49 to 87 MPa while the -6 dB focal width decreased ... -
Enhancing imaging systems using transformation optics.
(Opt Express, 2010-09-27)We apply the transformation optical technique to modify or improve conventional refractive and gradient index optical imaging devices. In particular, when it is known that a detector will terminate the paths of rays over ... -
Evaluation of high-perimeter electrode designs for deep brain stimulation.
(Journal of neural engineering, 2014-08)<h4>Objective</h4>Deep brain stimulation (DBS) is an effective treatment for movement disorders and a promising therapy for treating epilepsy and psychiatric disorders. Despite its clinical success, complications including ... -
Facet-embedded thin-film III-V edge-emitting lasers integrated with SU-8 waveguides on silicon.
(Opt Lett, 2010-10-15)A thin-film InGaAs/GaAs edge-emitting single-quantum-well laser has been integrated with a tapered multimode SU-8 waveguide onto an Si substrate. The SU-8 waveguide is passively aligned to the laser using mask-based ...
