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Articles 1 - 30 of 1944
Full-Text Articles in Engineering
Przebieg Zmienności Stężeń Wybranych Zanieczyszczeń W Gazach Odlotowych Z Procesu Mokrego Gaszenia Koksu, Marian Mazur, Robert Oleniacz, Marek Bogacki
Przebieg Zmienności Stężeń Wybranych Zanieczyszczeń W Gazach Odlotowych Z Procesu Mokrego Gaszenia Koksu, Marian Mazur, Robert Oleniacz, Marek Bogacki
Robert Oleniacz
Continuous measurement results of selected constituent concentrations in the gases emitted to the air during the coke wet quenching process were presented and discussed in the paper. The measurements were carried out for the standard wet quenching tower. The research covered such substances as carbon dioxide, carbon monoxide, hydrogen sulfide, nitrogen oxide, nitrogen dioxide and a total content of hydrocarbons and hydrogen (combustible gases). Changeability of the substance concentrations depending of the quenching process duration was analyzed. Among other things the beginning of these substances formation, appearance of the maximum and the range of observed concentrations were taken into consideration. …
Automated Segmentation Of Radiodense Tissue In Digitized Mammograms Using A Constrained Neyman-Pearson Classifier, Jeremy Thomas Neyhart
Automated Segmentation Of Radiodense Tissue In Digitized Mammograms Using A Constrained Neyman-Pearson Classifier, Jeremy Thomas Neyhart
Theses and Dissertations
Breast cancer is the second leading cause of cancer related mortality among American women. Mammography screening has emerged as a reliable non-invasive technique for early detection of breast cancer. The radiographic appearance of the female breast consists of radiolucent (dark) regions and radiodense (light) regions due to connective and epithelial tissue. It has been established that the percentage of radiodense tissue in a patient's breast can be used as a marker for predicting breast cancer risk. This thesis presents the design, development and validation of a novel automated algorithm for estimating the percentage of radiodense tissue in a digitized mammogram. …
An Invariance Transformation Algorithm For Defect Characterization Of Ultrasonic Signals For The Nondestructive Evaluation Of Concrete, Michael Dominic Ciocco
An Invariance Transformation Algorithm For Defect Characterization Of Ultrasonic Signals For The Nondestructive Evaluation Of Concrete, Michael Dominic Ciocco
Theses and Dissertations
Nondestructive evaluation (NDE) techniques offer cost-effective strategies for monitoring the integrity of a variety of civil infrastructure, such as natural gas and sewer pipelines, without the need to take the system off-line. However, interpretation of NDE signals in terms of the location, size, and shape of underlying flaws in the material being inspected is fraught with difficulty. Typically, variations in the testing signal due to operational parameters have created a significant challenge for defect characterization. This thesis proposes, develops, and validates a defect characterization algorithm that compensates for operational variables and maps the test signal to a visual defect profile. …
Optimal Pumping Strategies For Umatilla Chemical Depot Rdx And Tnt Plumes, Richard C. Peralta
Optimal Pumping Strategies For Umatilla Chemical Depot Rdx And Tnt Plumes, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
We present optimal pumping strategies to address RDX and TNT plumes at Umatilla Chemical Depot (UCD). We provide strategies for four optimization problem formulations. Each strategy requires constructing 2 wells. New Well U-1 is in the same location for all strategies. The second well location can differ with formulation. The number in a strategy’s name refers to the formulation it addresses. Using optimization in design is normally an iterative process involving interaction between the designer and client after preliminary optimizations are performed. This project does not permit that. To compensate, we present a second strategy for Formulation 1 (Strategy USU1B), …
Electrostatic Particle Separation System, Apparatus, And Related Method, John M. Stencel, John L. Schaefer, James K. Neathery, Heng Ban, Dennis Finseth
Electrostatic Particle Separation System, Apparatus, And Related Method, John M. Stencel, John L. Schaefer, James K. Neathery, Heng Ban, Dennis Finseth
Center for Applied Energy Research Faculty Patents
An electrostatic separation apparatus or system is provided for separating a particle mixture into two constituent species. The system includes a distributor for differentially tribocharging the particle species forming the mixture and supplying the charged mixture to a plurality of electrostatic separation cells. Each cell includes at least one separator having an inlet, a separation chamber having an electric field zone for drawing selected charged particles from the particle mixture, a collector, and a transition outlet. The length of the electric field zone is selectively adjustable for varying the charged particle drawing action. A curtain gas flow introduced into the …
Milliwatt Power Deep Ultraviolet Light-Emitting Diodes Over Sapphire With Emission At 278 Nm, J. P. Zhang, A. Chitnis, V. Adivarahan, S. Wu, V. Mandavilli, R. Pachipulusu, M. Shatalov, Grigory Simin, J. W. Yang, M. Asif Khan
Milliwatt Power Deep Ultraviolet Light-Emitting Diodes Over Sapphire With Emission At 278 Nm, J. P. Zhang, A. Chitnis, V. Adivarahan, S. Wu, V. Mandavilli, R. Pachipulusu, M. Shatalov, Grigory Simin, J. W. Yang, M. Asif Khan
Faculty Publications
We report on AlGaN multiple-quantum-well (MQW)-based deep ultraviolet light-emitting diodes over sapphire with peak emission at 278 nm. A new buffer layer growth process was used to reduce the number of defects and hence the nonradiative recombination. The improved material quality and carrier confinement resulted in pulsed powers as high as 3 mW at 278 nm and a significantly reduced deep-level-assisted long-wavelength emission.
Seismic Response Study Of Asymmetric Systems With Linear And Nonlinear Fluid Viscous Dampers, Rakesh K. Goel
Seismic Response Study Of Asymmetric Systems With Linear And Nonlinear Fluid Viscous Dampers, Rakesh K. Goel
Civil and Environmental Engineering
This investigation is concerned with application of nonlinear fluid viscous dampers for asymmetric-plan systems. For this purpose, the behavior of nonlinear fluid viscous dampers is summarized first followed by the effects of damper nonlinearity on seismic response of asymmetric systems. It is shown that the peak force in nonlinear damper tends to be smaller compared to linear damper. However, this is true only for values of V / ůo less that a certain threshold value; for larger values of V / ůo, the force in nonlinear damper may become larger· than that in the linear damper. While …
Chaotic Free-Space Laser Communication Over Turbulent Channel, N. F. Rulkov, Mikhail Vorontsov, L. Illing
Chaotic Free-Space Laser Communication Over Turbulent Channel, N. F. Rulkov, Mikhail Vorontsov, L. Illing
Electro-Optics and Photonics Faculty Publications
The dynamics of errors caused by atmospheric turbulence in a self-synchronizing chaos-based communication system that stably transmits information over a ∼5 km free-space laser link is studied experimentally. Binary information is transmitted using a chaotic sequence of short-term pulses as a carrier. The information signal slightly shifts the chaotic time position of each pulse depending on the information bit. We report the results of an experimental analysis of the atmospheric turbulence in the channel and the impact of turbulence on the bit-error-rate performance of this chaos-based communication system.
Dec 2002, Tractor Museum
Dec 2002, Tractor Museum
Museum Planning and Development Documents
Report from Director on Leave Development Projects Liason Report
Experimental Nonlinear Modeling Of A Rotating Machine With An Oil Film Bearing, Chiou-Fong Chung, Pi-Cheng Tung, Chiang-Nan Chang
Experimental Nonlinear Modeling Of A Rotating Machine With An Oil Film Bearing, Chiou-Fong Chung, Pi-Cheng Tung, Chiang-Nan Chang
Journal of Marine Science and Technology
In this study the system identification method is applied to obtain a nonlinear equation for an oil film rotating system. The centrifugal force induced by an unbalanced mass is used as the input signal for identification, and the phase between the input signal and the measured output vibration amplitude is calculated to perform the identification. Stability analysis and system performance are evaluated by using the root locus and the Floquet-Liapunov theorem. Based on the model, the oil whirl of the journal bearing can be predicted. A comparison between the simulation results and some experimented data shows the feasibility of the …
Fast Convergence Control Approach For High Dimensional Chaotic Systems, Hsun-Heng Tsai, Chyun-Chau Fuh, Pi-Cheng Tung
Fast Convergence Control Approach For High Dimensional Chaotic Systems, Hsun-Heng Tsai, Chyun-Chau Fuh, Pi-Cheng Tung
Journal of Marine Science and Technology
A simple and efficient method for controlling high dimensional discrete-time chaotic systems is proposed in this paper. This method is implemented similar to the OGY method, and is feasible for practical experiments. The key component is to assign the eigenvalues of a linearized map by using the well-known pole placement technique. According to the Cayley-Hamilton theorem, the trajectory will converge to the desired fixed point after n iterations at most (n is the dimension of the map), if the real trajectory of the chaotic system falls within the neighborhood of the desired fixed point. The proposed approach improves the convergence …
On The Permeability Inside The Granular Media, Chen-Yuan Chen, Chung-Pan Lee, Cheng-Wu Chen
On The Permeability Inside The Granular Media, Chen-Yuan Chen, Chung-Pan Lee, Cheng-Wu Chen
Journal of Marine Science and Technology
The permeability and resistance characteristics in porous structures with different grain size and shape have been studied experimentally in the paper. Two materials used in the study are crushed gravels and spherical glass balls with four sizes of 5.2 mm, 7. 4 mm, 12.2 mm, and 31.7 mm for gravels and 13.0 mm, 16.0 mm, 25. 0 mm, and 35.0 mm for balls, respectively. The permeability determined from linear Darcy Law shows a strong dependence on flow velocity in addition to grain sizes and shapes. This is not consistent to the traditional definition of permeability that is only a function …
Application Of The Force Control On The Working Path Tacking, Sun-Run Wang, Zhi-Zhong Qiao, Pi-Cheng Tung
Application Of The Force Control On The Working Path Tacking, Sun-Run Wang, Zhi-Zhong Qiao, Pi-Cheng Tung
Journal of Marine Science and Technology
For the application of tracking the path on workpieces, the CCD (Charge Couple Device) identificating system is generally used as one of the popular resolutions. However, the implementation of CCD identificating system is complex and environmental-limited. This study presents a compliant motion controller by using the end-effector installed with a force sensor. This results the smoothly path tracking on a workpiece. By applying the algorithm of Fuzzy into this compliant motion, the compliant control is improved and the path on the workpiece is found more quickly and accurately. A radius compensating method is used to correct the measured data. The …
Mathematical Modeling And Prediction Method Of Concrete Carbonation And Its Applications, Ming Te Liang, Wenjun Qu, Chih-Hsin Liang
Mathematical Modeling And Prediction Method Of Concrete Carbonation And Its Applications, Ming Te Liang, Wenjun Qu, Chih-Hsin Liang
Journal of Marine Science and Technology
The carbonation process of concrete is principally a diffusion phenomenon. The penetration rate of carbon dioxide depends mainly on the concrete quality and the exposure condition. Based on both Fick’s first and second laws of linear diffusion equations, the threedimensional equation of conservation of mass is expressed. This equation can be reduced to two- and one- dimensional equations of conservation of mass which can predict the carbonation depth beneath corners and the general surface of concrete structures, respectively. The objectives of this investigation are to measure the depth of carbonation from the free surface of a concrete member and to …
The Influence Of Energy Grouping And Undulation On Sediment Suspension In The Surf Zone, Po-Ching Lin, Hsien-Ter Chou, Jea-Tzyy Juang
The Influence Of Energy Grouping And Undulation On Sediment Suspension In The Surf Zone, Po-Ching Lin, Hsien-Ter Chou, Jea-Tzyy Juang
Journal of Marine Science and Technology
A field experiment was conducted to investigate the effects of the wave energy grouping and undulating on the sediment suspension in the surf zone at Taichung, Taiwan, in 1995. Instruments were deployed in line with the wave front, including one acoustic current meter, one pressure sensor, and four optical turbidity monitors were arranged in line and perpendicular to the bed. During the experiments the water depth was varied from 0.7 m to 3.6 m due to the tide level variations. The instruments were fixed to the ground to have data collected throughout the surf zone while the relative position of …
Monitoring Of Sandstorms With Rocsat-1 Oci Data, Shih-Jen Huang, Gin-Rong Liu, Tsung-Hua Kuo, Tang-Huang Lin, Chih-Kang Liang
Monitoring Of Sandstorms With Rocsat-1 Oci Data, Shih-Jen Huang, Gin-Rong Liu, Tsung-Hua Kuo, Tang-Huang Lin, Chih-Kang Liang
Journal of Marine Science and Technology
The Ocean Color Imager (OCI) onboard the ROCSAT-1 Satellite was employed to demonstrate its capability in monitoring sandstorm events around Mongolia and northwestern China where they have been occurring in great frequency over these past few years. The OCI measures the radiance from the visible to near infrared regions in six spectral channels. The radiance can be used to calculate the aerosol optical depth (AOD) of the atmosphere through an atmospheric correction algorithm. The variation in the AOD during January and February of 2001 is investigated in this study. A set of OCI images covering the Yellow Sea was selected …
Atmospheric Transmittance Of Amsu Channels: A Fast Computation Model, Tsung-Hua Kuo, Gin-Rong Liu, Chen-Gen Huang, Tang-Huang Lin, Chung-Chih Liu
Atmospheric Transmittance Of Amsu Channels: A Fast Computation Model, Tsung-Hua Kuo, Gin-Rong Liu, Chen-Gen Huang, Tang-Huang Lin, Chung-Chih Liu
Journal of Marine Science and Technology
In this study, the atmospheric transmittance of individual NOAA AMSU microwave channels was computed into a 40-layer atmospheric line-by-line FASCODE radiation model. Long-term sounding data from 1956 to 1991 collected over the Taiwan area was used to construct a 40-layer standard atmospheric model for the island. The simulated transmittance was also used to establish a regression-based fast-algorithm model to compute the atmospheric transmittance of Taiwan and its surrounding areas for various purposes. Despite the fact that the lower atmospheric layers of channels 14-18 indicated larger errors, the overall results revealed that the absolute value difference between the AMSU pass band-averaged …
A Reversible Three-Phase Step Up/Down Switching Mode Rectifier, Jenn-Jong Shieh
A Reversible Three-Phase Step Up/Down Switching Mode Rectifier, Jenn-Jong Shieh
Journal of Marine Science and Technology
In this paper, focus on the null space vector duty cycle control, a reversible three-phase step up/down switching mode rectifier is proposed attain clean sinusoidal input current, unity power factor, bidirectional power flow, step up/down output DC voltage and insensitivity for a voltage input. In addition, a precise simulation model is proposed to simulation by using PC software tools. Finally, some simulation and experimental results are presented for verification.
Buffer Interference Architecture, Vladimir I. Prodanov
Buffer Interference Architecture, Vladimir I. Prodanov
Electrical Engineering
An up to 3× breakdown voltage tristate capable integrated circuit CMOS buffer includes a level shifter circuit and a driver circuit. The driver stage includes a series connected n-channel and p-channel cascode stacks, each including at least three transistors. Dynamic gate biasing is provided for the third n-channel and p-channel cascode transistors to prevent voltage overstress of the cascode transistors. The level shifter circuit includes at least one pseudo N-MOS inverter including an input transistor, a protective cascode stack including at least one n-channel cascode transistor, and a load transistor. The level shifter provides at least one voltage shifted input …
Terahertz-Driven Nonlinear Electrical Transport In Semiconductor Nanostructures, C. Zhang
Terahertz-Driven Nonlinear Electrical Transport In Semiconductor Nanostructures, C. Zhang
Faculty of Engineering - Papers (Archive)
In this work, we used the quantum transport equation and density matrix formalism to calculate the frequency dependent electrical current of a two-dimensional electron gas directly driven by an intense terahertz laser. It is found that due to increased electron-photon coupling, the electron-impurity scattering decreases rapidly with the electric field.
Selective Laser Excitation Spectroscopy Of Gallium And Phosphorous In Germanium, C. A. Freeth, R. A. Lewis
Selective Laser Excitation Spectroscopy Of Gallium And Phosphorous In Germanium, C. A. Freeth, R. A. Lewis
Faculty of Engineering - Papers (Archive)
Shallow impurity states of donors and acceptors in Ge have been investigated by far-infrared laser magnetospectroscopy. The Zeeman splitting of the impurity states produces resonant absorption of the laser radiation at certain magnetic fields. The data are compared to measurements made using a conventional spectrometer and good agreement is found.
On-Chip Actuation Of An In-Plane Compliant Bistable Micromechanism, Michael S. Baker, Larry L. Howell
On-Chip Actuation Of An In-Plane Compliant Bistable Micromechanism, Michael S. Baker, Larry L. Howell
Faculty Publications
A compliant bistable micromechanism has been developed which can be switched in either direction using on-chip thermal actuation. The energy storage and bistable behavior of the mechanism is achieved through the elastic deflection of compliant segments. The Pseudo-Rigid-Body Model was used for the compliant mechanism design, and for analysis of the large deflection flexible segments. To achieve on-chip actuation, the mechanism design was optimized to allow it to be switched using linear motion thermal actuators. The modeling theory and analysis are presented for three design iterations, with two iterations fabricated in the MUMP's process and the third in the SUMMiT …
An Assessment Of Seawinds On Quikscat Wind Retrieval, David Draper, David G. Long
An Assessment Of Seawinds On Quikscat Wind Retrieval, David Draper, David G. Long
Faculty Publications
The scatterometer ocean wind retrieval process produces several possible solutions or ambiguities at each point, requiring a separate ambiguity selection step to infer a unique wind vector field. An ambiguity selection error occurs when the selected wind vector is not the closest ambiguity to the true wind. The current ambiguity selection routine for SeaWinds is ad hoc, but performs well under most circumstances. Factors such as instrument noise and rain can also cause the estimated wind flow to deviate from the true wind. A quality assurance (QA) analysis is performed to assess the ambiguity selection effectiveness and noise level of …
Optimation Model Of Planning Investment Dockyard With Approach Multi Objective Goal Programming, Ali Azhar
Optimation Model Of Planning Investment Dockyard With Approach Multi Objective Goal Programming, Ali Azhar
Makara Journal of Technology
Optimation model of planning investment dockyard with approach multi objective goal programming. The purpose of this research is to determine decision variable, goal function, alternative priority and achievement function in investment planning. From this optimation component, the model of ship yard investment planning could be achieved. The model of developed model in this research was the optimation of ship yard investment planning using multi objective goal programming approach. The model consist of 5 decision variable, 11 goal function, 2 alternative priority and 11 achievement functions. The model implementation was done toward PT ASSI investment planning. The calculation using from Quantitative …
The Use Of 2d Plastic Grating For Surface Profile And Dimension Manufacture Product Measurements By Using Ndt Moiré Technique, Retno Wigajatri P., Dini Andiani
The Use Of 2d Plastic Grating For Surface Profile And Dimension Manufacture Product Measurements By Using Ndt Moiré Technique, Retno Wigajatri P., Dini Andiani
Makara Journal of Technology
The Use of 2D Plastic Grating for Surface Profile and Dimension Manufacture Product Measurements by Using NDT Moiré Technique. Research of measuring the shape and dimension of object using the moiré technique have been done. Measurement have been made by observing the moiré space as a result of interaction between grating and its shadow casted on the object’s surface caused by the projector lamp with CCD camera. The acquired data was further processed by way of off-line. By successive phase shifts that is π/2, π dan 3π/2 towards the table tennis ball at the distance of 48 cm from the …
Self-Ignition Properties Of Peat, Palm Shell Fibre And Woods, Yulianto Sulistyo Nugroho
Self-Ignition Properties Of Peat, Palm Shell Fibre And Woods, Yulianto Sulistyo Nugroho
Makara Journal of Technology
Self-ignition properties of peat, palm shell fibre and woods. Forest fire is one of the greatest environmental problems faced by Indonesia. Forest fires have destroyed million hectares of forest and land which cause economic loss, social problems including smoke related diseases and environmental disaster with long time consequences. The exothermic reactions of forest fuels that lead to fire can be initiated by a piloted flame and low-temperature oxidation mechanism. This paper presents the results of low temperature oxidation studies using forests fuel samples i.e. palm shell fibre, peat, woods and low-rank coal. The measured values of the critical oven temperatures …
Emission Gas Reducer On Motor Vehicle, Automobile, Light Engine Of Boat And Stationary Combustion Engine., I Gusti Bagus Wijaya Kusuma
Emission Gas Reducer On Motor Vehicle, Automobile, Light Engine Of Boat And Stationary Combustion Engine., I Gusti Bagus Wijaya Kusuma
Makara Journal of Technology
Emission gas reducer on motor vehicle, automobile, light engine of boat and stationary combustion engine. The use of motor vehicle should be followed by protection against damages on the environment, since the exhaust gas from combustion engine has significantly affect on air and environmental pollution. One method to solve the problems in air pollution has been done by using a re-heater designed in Mechanical Engineering Department, University of Udayana. In accordance to the test on the re-heater, it can be seen very clear that the re-heater has significantly reduce the CO emission of about 54%. It also reduces the CO2 …
Application Of Remote Sensing For Mapping Soil Organic Matter Content, Bangun Muljo Sukojo, Wahono Wahono
Application Of Remote Sensing For Mapping Soil Organic Matter Content, Bangun Muljo Sukojo, Wahono Wahono
Makara Journal of Technology
Application of Remote Sensing for Mapping Soil Organic Matter Content. Information organic content is important in monitoring and managing the environment as well as doing agricultural production activities. This research tried to map soil organic content in Malang using remote sensing technology. The research uses 6 bands of data captured by Landsat TM (Thematic Mapper) satellite (band 1, 2, 3, 4, 5, 7). The research focuses on pixels having Normalized Difference Soil Index (NDSI) more than 0.3. Ground-truth data were collected by analysing organic content of soil samples using Black-Walkey method. The result of analysis shows that digital number of …
Iodat Analysis Content In Cooking Ingredients Using Iodometry And X-Ray Fluorescence Methods., Nelson Saksono
Iodat Analysis Content In Cooking Ingredients Using Iodometry And X-Ray Fluorescence Methods., Nelson Saksono
Makara Journal of Technology
Iodat Analysis Content in Cooking Ingredients Using Iodometry and X-ray Fluorescence Methods. Salt iodization program using iodine fortification into salt method is the best method that is effective and economical to overcome the problems caused by iodine deficiency. However in, its development there are some issues clamed that the use of iodized salt is ineffective since iodine content reduces, even disappear when the salt mix with other cooking ingredients. In order to investigated the existence of iodine in cooking ingredients, a research applying iodometry and X-ray fluorescence methods was carry out. The result obtained by iodometry method showed decreases in …
An Optimum Greedy Algorithm For Choosing Minimal Set Of Conflicting Constraints In The Point Sequencing Problem, Florent Launay, Mitra Debasis
An Optimum Greedy Algorithm For Choosing Minimal Set Of Conflicting Constraints In The Point Sequencing Problem, Florent Launay, Mitra Debasis
Electrical Engineering and Computer Science Faculty Publications
In this work, we first have proposed a technique to define the "causes" of inconsistency on an online point based reasoning constraint network. Second, we introduce an algorithm that proposes the user a minimal set of relations to remove when inconsistencies are detected. We have developed and implemented a battery of algorithms for the purpose of this type of reasoning. Some useful theorems and properties are defined for proving the 'minimal' aspect of the algorithm. Finally, we found that our investigation was a polynomially solvable sub problem of the vertex cover problem.