127 research outputs found
Techno-economic assessment of sour gas oxy-combustion water cycles for CO2 capture
Growing energy demand coupled with the threat of global warming call for investigating alternative and unconventional energy sources while reducing CO2 emissions. One of these unconventional fuels is sour gas, which consists of methane, hydrogen sulfide and carbon dioxide. Using this fuel poses many challenges because of the toxic and corrosive nature of its combustion products. A promising technology for utilizing it is oxy-fuel combustion with carbon capture and storage, including the potential of enhanced oil recovery for added economic benefits. Although methane oxy-fuel cycles have been studied in the literature, using sour gas as the fuel has not been investigated or considered. In this paper, water is used as the diluent to control the flame temperature in the combustion process, and the associated cycle type is modeled to examine its performance. As the working fluid condenses, sulfuric acid forms which causes corrosion. Therefore, either expensive acid resistant materials should be used, or a redesign of the cycle is required. These different options are explored. A cost analysis of the proposed systems is also conducted to provide preliminary estimates for the levelized cost of electricity (LCOE). The results show the acid resistance cycle with a 4.5% points increase in net efficiency over the cycle with SO[subscript x] removal. However there is nearly a 9% decrease in the cycle's LCOE for the latter case.Aspen Technology, Inc
Self-Consistent C-V Characterization of Depletion Mode Buried Channel InGaAs/InAs Quantum Well FET Incorporating Strain Effects
We investigated Capacitance-Voltage (C-V) characteristics of the Depletion
Mode Buried Channel InGaAs/InAs Quantum Well FET by using Self-Consistent
method incorporating Quantum Mechanical (QM) effects. Though the experimental
results of C-V for enhancement type device is available in recent literature, a
complete characterization of electrostatic property of depletion type Buried
Channel Quantum Well FET (QWFET) structure is yet to be done. C-V
characteristics of the device is studied with the variation of three important
process parameters: Indium (In) composition, gate dielectric and oxide
thickness. We observed that inversion capacitance and ballistic current tend to
increase with the increase in Indium (In) content in InGaAs barrier layer.Comment: 5 pages, ICEDSA conference 201
Self Consistent Simulation of C-V Characterization and Ballistic Performance of Double Gate SOI Flexible-FET Incorporating QM Effects
Capacitance-Voltage (C-V) & Ballistic Current- Voltage (I-V) characteristics
of Double Gate (DG) Silicon-on- Insulator (SOI) Flexible FETs having sub 35nm
dimensions are obtained by self-consistent method using coupled Schrodinger-
Poisson solver taking into account the quantum mechanical effects. Although,
ATLAS simulations to determine current and other short channel effects in this
device have been demonstrated in recent literature, C-V & Ballistic I-V
characterizations by using self-consistent method are yet to be reported. C-V
characteristic of this device is investigated here with the variation of bottom
gate voltage. The depletion to accumulation transition point (i.e. Threshold
voltage) of the C-V curve should shift in the positive direction when the
bottom gate is negatively biased and our simulation results validate this
phenomenon. Ballistic performance of this device has also been studied with the
variation of top gate voltage.Comment: 4 pages, ICEDSA 2012 conferenc
In_xGa_{1-x}Sb MOSFET: Performance Analysis by Self Consistent CV Characterization and Direct Tunneling Gate Leakage Current
In this paper, Capacitance-Voltage (C-V) characteristics and direct tunneling
(DT) gate leakage current of antimonide based surface channel MOSFET were
investigated. Self-consistent method was applied by solving coupled
Schr\"odinger-Poisson equation taking wave function penetration and strain
effects into account. Experimental I-V and gate leakage characteristic for
p-channel InxGa1-xSb MOSFETs are available in recent literature. However, a
self- consistent simulation of C-V characterization and direct tunneling gate
leakage current is yet to be done for both n- channel and p-channel InxGa1-xSb
surface channel MOSFETs. We studied the variation of C-V characteristics and
gate leakage current with some important process parameters like oxide
thickness, channel composition, channel thickness and temperature for n-channel
MOSFET in this work. Device performance should improve as compressive strain
increases in channel. Our simulation results validate this phenomenon as
ballistic current increases and gate leakage current decreases with the
increase in compressive strain. We also compared the device performance by
replacing InxGa1-xSb with InxGa1-xAs in channel of the structure. Simulation
results show that performance is much better with this replacement.Comment: 7 pages, EIT 2012 IUPUI conferenc
A Physically Based Analytical Modeling of Threshold Voltage Control for Fully-Depleted SOI Double Gate NMOS-PMOS Flexible-FET
In this work, we propose an explicit analytical equation to show the
variation of top gate threshold voltage with respect to the JFET bottom gate
voltage for a Flexible Threshold Voltage Field Effect Transistor (Flexible-FET)
by solving 2-D Poisson's equation with appropriate boundary conditions,
incorporating Young's parabolic approximation. The proposed model illustrates
excellent match with the experimental results for both n-channel and p-channel
180nm Flexible-FETs. Threshold voltage variation with several important device
parameters (oxide and silicon channel thickness, doping concentration) is
observed which yields qualitative matching with results obtained from SILVACO
simulations.Comment: 4 pages, EIT 2012-IUPUI conferenc
Traffic Congestion Prediction using Deep Convolutional Neural Networks: A Color-coding Approach
The traffic video data has become a critical factor in confining the state of
traffic congestion due to the recent advancements in computer vision. This work
proposes a unique technique for traffic video classification using a
color-coding scheme before training the traffic data in a Deep convolutional
neural network. At first, the video data is transformed into an imagery data
set; then, the vehicle detection is performed using the You Only Look Once
algorithm. A color-coded scheme has been adopted to transform the imagery
dataset into a binary image dataset. These binary images are fed to a Deep
Convolutional Neural Network. Using the UCSD dataset, we have obtained a
classification accuracy of 98.2%
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