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Error Analysis of Breast Tumor Signature versus Skin Thickness at Microwave Frequencies

Error Analysis of Breast Tumor Signature versus Skin Thickne...

引用

2008 IEEE Antennas and Propagation Society International Symposium (APSURSI 2008), vol.6

作者： Douglas A. Woten Magda El-Shenawee Microelectronics-Photonics Program University of Arkansas Fayetteville AR USA Department of Electrical Engineering University of Arkansas Fayetteville AR USA

ISBN: (纸本)9781424420414

The effect of breast skin thickness on electromagnetic scattering is explored in this work using the Ansoft High Frequency Structure Simulator (HFSS) package. The signature of a spherical tumor of 1cm in diameter is compared to the skin effect. A more realistic inhomogeneous breast model is used based on a magnetic resonance imaging (MRI) scan. This model contains five regions;air, skin, fatty tissue, fibro-glandular tissue and the malignant tumor. The preliminary results of this work indicate that the tumor signature is larger than the effect of the skin in the backscatter for the case presented.

关键词： thickness of skin Microwave frequencies Error analysis signatures skin effect Breast Neoplasms Electromagnetic scattering backscattering skin epidermis (animal)

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Computational model of breast cancer tumor growth

Computational model of breast cancer tumor growth

引用

2007 IEEE Region 5 Technical Conference, TPS

作者： Shumate, Seth D. El-Shenawee, Magda Microelectronics-Photonics Program University of Arkansas Fayetteville United States Department of Electrical Engineering University of Arkansas Fayetteville United States

Computational methods have been utilized to simulate the growth behavior of a tumor originating near the mandible. Extension of the model to three-dimensions (3D) and adaptation to the case of breast cancer, specifica... 详细信息

ISBN: (纸本)1424412803

关键词： Tumors

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Effect of wave polarization on breast cancer detection

Effect of wave polarization on breast cancer detection

引用

2007 IEEE Region 5 Technical Conference, TPS

作者： Woten, Douglas A. El-shenawee, Magda Microelectronics-Photonics Program University of Arkansas Fayetteville AK 72701 United States Department of Electrical Engineering University of Arkansas Fayetteville AK 72701 United States

ISBN: (纸本)1424412803

Artificial Neural Networks are explored as a statistical indicator of breast cancer. A simplified model of the breast and tumor is implemented and the scattered electromagnetic fields are used to train and test an Artificial Neural Network. The effects of wave polarization and tumor orientation are explored using a broadband dual-linear antenna. © 2007 IEEE.

关键词： Neural networks

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Optical emission spectroscopy in a reactive ion etching system

Optical emission spectroscopy in a reactive ion etching syst...

引用

2007 IEEE Region 5 Technical Conference, TPS

作者： Koirala, S.P. Gordon, M.H. Cai, L. Burkett, S.L. Schaper, L.W. Microelectronics-Photonics Program University of Arkansas Fayetteville AR 72701 United States Department of Mechanical Engineering University of Arkansas Fayetteville AR 72701 United States Department of Electrical Engineering University of Arkansas Fayetteville AR 72701 United States

ISBN: (纸本)1424412803

In this work, we utilize optical emission spectroscopy (OES) to monitor the excited state densities of fluorine atoms in a 100 mTorr, 40 seem sulfur hexafluoride (SF6) plasma at both 100 and 250 W. Emission data were collected from 350nm to 1000nm through a quartz viewport using a 400 um optical fiber connected to an OceanOptics USB4000 CCD system with a 10m entrance slit. After obtaining the relative spectral response of our system using a tungsten halogen lamp, we generated fluorine excited state Boltzmann plots. Results indicate a 50 % increase in the fluorine excited state population for the 250W plasma compared to the 100W discharge, and, more surprisingly, a population inversion (higher population of the higher energy states);however, this latter result is consistent with other data in the literature. We suspect the cause for the population inversion is the low pressure, and thus low collision frequencies, in conjunction with an upper state metastable state. ©2007 IEEE.

关键词： Sulfur hexafluoride

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An Aligned Carbon Nanotube Biosensor for DNA Detection

An Aligned Carbon Nanotube Biosensor for DNA Detection

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IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

作者： Jason Clendenin Jin-Woo Kim Steve Tung Microelectronics and Photonics Graduate Program University of Arkansas Fayetteville AR USA Member IEEE Department of Biological and Agricultural Engineering The University of Arkansas Fayetteville AR USA. Microelectronics and Photonics Graduate Program The University of Arkansas Fayetteville AR USA. jwkim@uark.edu Member IEEE Department of Mechanical Engineering The University of Arkansas Fayetteville AR USA. Microelectronics and Photonics Graduate Program The University of Arkansas Fayetteville AR USA.

This paper reports the design and fabrication of a biosensor based on aligned single wall carbon nanotubes (SWCNTs) with integrated single-strand DNAs (ssDNA). This ultra-sensitive biosensor provides label-free real-time electronic detection of DNA hybridization between surface-immobilized ssDNA and target ssDNA. Hybridization kinetics between complementary and target ssDNA nucleotide base pairs result in a local charge generation between base pairs that is injected into the SWCNTs resulting in a detectable change in SWCNT electrical conductance. This conductance change is amplified electrically through the integration of the functionalized SWCNTs as the semi-conductive channel in a silicon-silicon oxide based field effect transistor (FET). Based on previous Langmuir DNA kinetics calculations, the projected sensitivity level of the SWCNT-DNA sensor is considerably higher than traditional fluorescent and hybridization assays.

关键词： Carbon nanotubes Biosensors DNA FETs USA Councils Kinetic theory Hybrid power systems Agricultural engineering Fluorescence Probes

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Improvement of artificial neural network detection of breast cancer using broadband dual polarized antenna

Improvement of artificial neural network detection of breast...

引用

Antennas and Propagation Society International Symposium

作者： Douglas A. Woten Magda El-Shenawee Microelectronics-Photonics Program University of Arkansas Fayetteville AR USA Electrical Engineering Department University of Arkansas Fayetteville AR USA

This work represents a numerical investigation into the improvement of artificial neural network detection of breast cancer using a planar broadband antenna and a three-region breast model. Modified Fourpoint antennas are used, which are capable of producing various wave polarizations. The effect of wave polarization on statistical detection will be investigated in this paper.

关键词： Broadband antennas Artificial neural networks Cancer detection Breast cancer Polarization Breast neoplasms Petroleum Frequency Testing Breast tissue

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Chaotic behaviors in three-level atomic optical bistability system

Chaotic behaviors in three-level atomic optical bistability ...

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Conference on Lasers and Electro-Optics, CLEO 2006

作者： Yang, Wenge Joshi, Amitabh Xiao, Min Department of Physics University of Arkansas Fayetteville Arkansas 72701 United States Microelectronics-Photonics Program University of Arkansas Fayetteville Arkansas 72701 United States

We experimentally demonstrated chaotic behaviors in three-level Lambda-type atoms inside an optical cavity. The route to chaos through periodic doubling was observed in the experiment, which could be controlled by the...

ISBN: (纸本)1557528136

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Creating an industrial work group atmosphere in technology graduate programs: An unexpected impact on minority success in graduate school

Creating an industrial work group atmosphere in technology g...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Vickers, Ken Foster, Ron Salamo, Greg University of Arkansas United States Department of Physics University of Arkansas United States Interdisciplinary Microelectronics-Photonics Graduate Program Basore Endowed Department of Physics University of Arkansas United States Optical Society of America United States

The interdisciplinary graduate program in microelectronics-photonics (microEP) was created at the University of Arkansas in the fall of 1998 to merge traditional graduate research and educational excellence with specific training in operational effectiveness methods, intra and entrepreneurial skills, and teaming and group dynamics practice. The stated goal of this approach was to create a graduate program that emulates the industrial work group environment, with the group objective being that every graduate student achieves the highest academic training of which he or she is capable. In the seven years since the microEP grad program was started, this educational experiment in creating a graduate program centered in a natural work group culture has proven beneficial to its students - and has even been largely adopted by the UA Physics graduate program1. What was not expected is that this natural work group approach also created a graduate community that has acted to bridge minority students from the heavily supportive MSI atmosphere to the generally impersonal atmosphere found in white majority research intensive grad programs. Including the fall 2005 entering microEP Cohort 8 students, one hundred and three students are currently enrolled or graduated. This includes seventeen minority students, a percentage half again as high as the national average of graduating minority PhD students2and much higher than the current enrollment in the traditional UA science and engineering graduate programs. Two African-American men have completed their PhD microEP degrees, with one joining Virginia Commonwealth University as a tenure track faculty member, and the second currently enrolled in the University of Alabama Birmingham Medical School. In this paper the authors will first discuss methods that have been used to locate students in communities underrepresented in science and engineering that would be well served by the microEP research and educational training. The authors wil

关键词： Engineering education

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Control of sidewall slope in silicon vias using SF2 O 2plasma etching in a conventional reactive ion etching tool

Control of sidewall slope in silicon vias using SF2 O 2plasm...

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作者： Figueroa, R.F. Spiesshoefer, S. Burkett, S.L. Schaper, L. Microelectronics-Photonics Program University of Arkansas Fayetteville AR 72701 Department of Electrical Engineering University of Arkansas Fayetteville AR 72701

The etching of anisotropic blind vias in silicon with diameters of 5-10 μm and an aspect ratio ∼2-4 with controlled sidewall inclination is reported. The motivation for this work is the creation of a vertical, or three dimensional interconnect. Via formation by reactive ion etch (RIE) processing is the focus of this project. Arrays of vias have been etched in 125 mm diam silicon (100) wafers using a photoresist mask. A parallel plate RIE system with a SF6 O2 gas mixture is used. The effects of O2 (SF6 + O2) gas flow ratio, electrode bias, and chamber pressure on etch rate and feature profile have been studied. Visualization of the via profiles using scanning electron microscopy is used to identify the key parameters that control the sidewall slope. This slope is important for the subsequent deposition of via lining materials before filling with Cu. Our results indicate that the O2 (SF6 + O2) ratio is a key parameter in determining the sidewall slope, however the electrode bias and chamber pressure are critical in determining the physical and chemical process balance that determine the anisotropy of the etch process. © 2005 American Vacuum Society.

关键词： Anisotropy

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Chaotic behaviors in three-level atomic optical bistability system

Chaotic behaviors in three-level atomic optical bistability ...

引用

Quantum Electronics and Laser Science Conference, QELS 2005

作者： Yang, Wenge Joshi, Amitabh Xiao, Min Department of Physics University of Arkansas Fayetteville AR 72701 United States Microelectronics-Photonics Program University of Arkansas Fayetteville AR 72701 United States

ISBN: (纸本)1557527709

关键词： Optical bistability

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