检索结果-内蒙古大学图书馆

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

来源：评论

学校读者我要写书评

暂无评论

Fabrication of nanoelectrode ensembles using silicon nanowires in an electrochemical glucose sensor

Fabrication of nanoelectrode ensembles using silicon nanowir...

引用

IEEE SENSORS

作者： Sanghamitra Mandal Mohammed Marie Omar Manasreh Department of Electrical Engineering University of Arkansas Fayetteville Arkansas USA Microelectronics Photonics Program University of Arkansas Fayetteville Arkansas USA

Gold (Au) nanoelectrode ensembles (NEEs) were investigated after the synthesis of silicon nanowires using the metal assisted chemical etching technique. Structural and non-destructive optical characterization of silicon nanowires are carried out to determine its morphology and crystallinity. The cyclic voltammetry technique is used to determine the oxidation-reduction potentials of the sensor at different voltage scan rates of 100, 200, and 300 mV/s. Amperometric measurement at a fixed oxidation potential of 0.6 V is performed to measure the sensitivity, response time, and detection limit of the sensor. The presence of Au NEEs improve the signal to noise ratio of the sensor. Therefore, the sensor exhibits a high sensitivity of 0.4 mA/mM cm 2 with a response time of 1 s, and a limit of detection 0.077 mM.

关键词： Silicon Nanowires Sugar Gold Etching Fabrication Sensitivity

来源：评论

学校读者我要写书评

暂无评论

Planar broadband dual-linearly polarized MEMS steerable antenna

Planar broadband dual-linearly polarized MEMS steerable ante...

引用

Antennas and Propagation Society International Symposium

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

In this work we will present the fabrication process and preliminary experimental results of a MEMS steerable broadband antenna. The antenna is designed to fit on a 1cm x 1cm silicon platform with a thin benzocyclobutene (BCB) dielectric coating and operate between 4-9GHz. The modified Fourpoint antenna is simulated using ANSOFT High Frequency Structure Simulator (HFSS) and has a return loss of less than -10dB in the operating band.

关键词： Broadband antennas Polarization Micromechanical devices Metallization Etching Titanium Frequency Copper Fabrication Silicon

来源：评论

学校读者我要写书评

暂无评论

Extreme surface wetting for solar panel applications

Advancing Microelectronics

引用

Advancing microelectronics 2012年第6期39卷 12-15页

作者： Thompson, C.S. Fleming, R.A. Zou, M. Microelectronics and Photonics Program University of Arkansas Fayetteville AR 72701 United States Department of Mechanical Engineering University of Arkansas Fayetteville AR 72701 United States

Extreme wetting properties on glass and poly(ethylene terephthalate) (PET) surfaces have been achieved using scalable processes. Superhydrophilic surfaces are created by depositing a porous nanoparticle film on the substrate surface. The porosity of this film leads to enhanced optical transmittance of the substrates. When deposited on the glass, it also leads to self-cleaning and antifogging behavior. If used in the packaging of solar cells, this coating could increase overall efficiency of the device.

关键词： Glass

来源：评论

学校读者我要写书评

暂无评论

Intersubband Transitions in InxGa1-xAs/AlGaAs Multiple Quantum Wells for Long Wavelength Infrared Detection

引用

MRS Online Proceedings Library 2003年第1期744卷 1-6页

作者： Workman, Clayton L. Wang, Zhiming Ma, Wenquan George, Christi E. Panneer Selvam, R. Salamo, Gregory J. Zhou, Qiaoying Omar Manasreh, M. Center for Semiconductor Physics in Nanostructures (C-SPIN) and the Microelectronics-Photonics Program University of Arkansas Fayetteville USA Department of Electrical and Computer Engineering University of New Mexico Albuquerque USA

We report on intersubband transitions in InxGa1-xAs/AlGaAs multiple quantum wells (MQWs) grown by molecular beam epitaxy. The conduction band offset for this material system is larger than that of the well known GaAs/AlGaAs system, thus making it possible to design, grow, and fabricate quantum well infrared photodetectors operational beyond the 14 μm spectral region with minimized dark current. We have grown InxGa1-xAs/AlGaAs MQWs with indium compositions ranging from x = 0.08 to 0.20 verified by in situ RHEED oscillations, band offset measurements, and high-resolution X-ray diffraction. Band-to-band transitions were verified by photoluminescence measurements, and intersubband transitions were measured using Fourier transform infrared (FTIR) spectroscopy. Due to the high strain and introduction of dislocations associated with the high indium content, wells with indium compositions above ∼ 0.12 did not result in intersubband transitions at silicon doping levels of 2×1018 cm-3. A thick linear graded InxGa1-xAs buffer was grown below the MQW structures to reduce the strain and resulting dislocations. Intersubband transitions were measured in InxGa1-xAs wells with indium compositions of x = 0.20 and greater when grown on top of the linear graded buffer. In addition to these results, FTIR measurements on InGaAs/AlGaAs MQW multi-color, long-wavelength infrared detector structures are reported.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Nanostructured PVP/SiO2 antireflective coating for solar panel applications

Nanostructured PVP/SiO2 antireflective coating for solar pan...

引用

IEEE Conference on Nanotechnology

作者： Corey S. Thompson Min Zou Microelectronics and Photonics Graduate Program at the University of Arkansas Fayetteville AR USA Department of Mechanical Engineering University of Arkansas Fayetteville AR USA

ISBN: (纸本)9781479906741

In this work, a nanostructured antireflective coating is created using a simple aqueous dip coating method. The addition of polyvinylpyrrolidone as an adhesion layer is shown to significantly impact the formation of nanostructures on the surface of the coating. The resulting variation in surface roughness creates a layer with a graded index of refraction. These films create an antireflective surface that increases the optical transmittance of glass substrates from 94.5% for silica nanoparticle films to 98.6% for PVP enhanced silica nanoparticle films at 500 nm wavelength.

关键词： Silicon compounds Films Surface topography Glass Coatings Surface treatment Optical surface waves

来源：评论

学校读者我要写书评

暂无评论

Interfacing micro-/nano-scale biological and abiological materials for bio/abio hybrid systems

Interfacing micro-/nano-scale biological and abiological mat...

引用

Nanoscale Devices, Materials, and Biological Systems: Fundamental and Applications - Proceedings of the International Symposium

作者： Kim, Jin-Woo Tung, Steve Deaton, Russell Department of Biological and Agricultural Engineering University of Arkansas Fayetteville AR 72701 Department of Computer Science and Computer Engineering University of Arkansas Fayetteville AR 72701 Department of Mechanical Engineering University of Arkansas Fayetteville AR 72701 Cell and Molecular Biology Program University of Arkansas Fayetteville AR 72701 Microelectronics-Photonics Program University of Arkansas Fayetteville AR 72701

The emergence of a micro- and nano-scale bio/abio hybrid technology that makes use of the advantages of both micro-/nano-scale biological and abiological materials is evident, owing to the unique properties of biological micro-/nano-materials, such as DNA, proteins and cells, as well as those of abiological materials, such as carbon nanotubes (CNTs) and nanoparticles. However, the major challenges for making this merger feasible are integration and interfacing of the bio- and abio-materials. We are investigating the realization of the bio/abio hybrid systems to address this issue through developing (a) a micro flagellar motor based self-powered micro-actuator (μFMA), (b) a micro flagellar motor based AC dynamo (μFMD), and (c) a DNA-based CNT wire (DNA/NTW) nanosensor. This paper discusses our efforts to understand and develop the nanoscale interfaces of bio- and abio-components, i.e. flagellum-substrate and DNA-CNT, to achieve the next generation bio/abio hybrid engineered systems.

关键词： Nanostructured materials

来源：评论

学校读者我要写书评

暂无评论

Design consideration, process and mechanical modeling, and tolerance analysis of a mems-based mechanical machining system-on-a-chip (SOAC) for nanomanufacturing

Design consideration, process and mechanical modeling, and t...

引用

作者： O'Neal, Chad B. Malshe, Ajay P. Virwani, Kumar Schmidt, William F. Microelectronics-Photonics Program University of Arkansas Fayetteville AR 72701 United States SERC-MRL Mechanical Engineering Department University of Arkansas Fayetteville AR 72701 United States Mechanical Engineering Department University of Arkansas Fayetteville AR 72701 United States

ISBN: (纸本)0791836487

In this paper the authors describe the design considerations including force and tolerance analysis and mechanism and tip design, for a novel, dynamic scanning probe microscopy tip directly insertable into today's existing atomic force microscopy tools. This tool is the first of its kind and is a major step in the field of nanomanufacturing enabling the use of nanomechanical machining operations for nanostructure top-down manufacturing. The application of this device is the nanomechanical drilling and milling of III-V semiconductor substrates for various applications such as nanovias for electrical interconnection of next generation electronic and photonic applications, as well as reservoirs and capillaries for nano-fluidics. Results to date indicate that device performance parameters allow a normal drilling force of 25 μN, tangential drilling force of 35 μN, maximum rotational speed of 100,000 rpm, and minimum machined feature size of less than 200 nm. This device is currently being fabricated at Sandia National Laboratories, SUMMIT MEMS foundry and being packaged at the University of Arkansas, Fayetteville High Density Electronics Center (HiDEC). Copyright © 2002 by ASME.

关键词： III-V semiconductors

来源：评论

学校读者我要写书评

暂无评论

Dehydration Sensing of a Polyvinyl Alcohol Film via Plasmonic Nanoparticles

Dehydration Sensing of a Polyvinyl Alcohol Film via Plasmoni...

引用

MRS Advances

作者： Lisunova, Milana O. School of Materials Science and Engineering School of Chemistry and Biochemistry Georgia Institute of Technology AtlantaGA30332 United States MicroElectronics-Photonics Program Institute for Nanoscience and Engineering Ralph E. Martin Department of Chemical Engineering 3202 Bell Engineering Center University of Arkansas FayettevilleAR72701 United States

In situ, real-time monitoring of a dehydration of poly(vinyl alcohol) (PVA) film is researched. The technique based on the incorporation plasmonic nanocages (NCs) between the two identical layers of PVA, (PVA)/NCs/(PVA) film, and its sensitivity to the variation of the refractive index of the surrounding PVA film via desorption water. The dehydration time increases from 180 (s) to 1800 (s) as the content of the PVA in the films increases twice, from (PVA)/NCs/(PVA) to (PVA)2/NCs/(PVA)2. Such effect could be explained by different rate of the molecules desorption from the PVA based films. Specifically, the dehydration rate is of 0.22 (vol% per s) and 0.026 (vol% per s) for (PVA)/NCs/(PVA) and (PVA)2/NCs/(PVA)2 films, respectively. The dehydration rate constant reduces from -50×10-4 (s-1) to -4.3 ×10-4 (s-1) as the content of PVA increases from (PVA)/NCs/(PVA) to (PVA)2/NCs/(PVA)2 films, respectively. © Materials Research Society 2019.

关键词： Plasmonics

来源：评论

学校读者我要写书评

暂无评论

Energy Demand Analysis of Photovoltaic Device – Material and Nanomanufacturing Process Discovery

引用

Procedia Manufacturing 2015年 1卷 226-237页

作者： Shilpi Mukherjee Gregory Salamo Ajay P. Malshe Microelectronics and Photonics Program University of Arkansas Fayetteville AR Institute of Nano Materials Science and Engineering University of Arkansas Fayetteville AR Materials and Manufacturing Research Labs Mechanical Engineering University of Arkansas Fayetteville AR

Most solar cell manufacturing plants and research laboratories in the U.S. use non-renewable energy for their operations. This energy paradox must be addressed, especially due to the increased spending toward photovoltaic (PV) technology research and manufacturing fueled by the growing demand for renewable energy supply. At the same time, it is also important that the scientific community be made aware of the energy cost of energy research. While keeping scientific discovery a priority, it must be understood that energy is precious and must be conserved, including at the research and development stage of a product's life cycle. With energy conservation in mind, a case study was conducted to quantify the energy demand for the research phase of an emerging PV technology and identify energy intensive components. The test-bed system chosen for this study was a quantum-wire (QWR) based intermediate band solar cell grown by molecular beam epitaxy (MBE) and fabricated by photolithography. This paper presents the results of the energy demand analysis performed on the QWR-based solar cell research test-bed system. Life cycle assessment (LCA), an internationally accepted tool for energy and sustainability analysis, was chosen as the methodology for conducting this case study.

关键词： energy solar photovoltaic life cycle sustainability renewable energy

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：