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Articles 21511 - 21540 of 33681
Full-Text Articles in Entire DC Network
Seismic Test Methods For Architectural Glazing Systems, Richard A. Behr, Abdeldjelil Belarbi
Seismic Test Methods For Architectural Glazing Systems, Richard A. Behr, Abdeldjelil Belarbi
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
An ongoing effort is being made at the University of Missouri-Rolla to develop standard laboratory test methods and codified design procedures for architectural glass under seismic loadings. Recent laboratory work has yielded some promising results regarding the development of an appropriate seismic test method for architectural glass, as well as identifying ultimate limit states that quantify the seismic performance and damage thresholds of various glass types. Specifically, a straightforward "crescendo-like" in-plane dynamic racking test, performed at a constant frequency, has been employed successfully. Two ultimate limit states for architectural glass have been defined: (1) a lower ultimate limit state corresponding …
A Class Of Modified Hopfield Networks For Aircraft Identification And Control, Jie Shen, S. N. Balakrishnan
A Class Of Modified Hopfield Networks For Aircraft Identification And Control, Jie Shen, S. N. Balakrishnan
Mechanical and Aerospace Engineering Faculty Research & Creative Works
This paper presents a class of modified Hopfield neural networks and their use in solving aircraft optimal control and identification problems. This class of networks consists of parallel recurrent networks which have variable dimensions that can be changed to fit the problems under consideration. It has a structure to implement an inverse transformation that is essential for embedding optimal control gain sequences. Equilibrium solutions are discussed. Energy minimization of the networks leads to identification of the system parameters. Numerical results are provided to identify the dynamics of an aircraft, and the corresponding optimal control is calculated online. Comparison of the …
Target Profile Estimation Using Haar Functions, William R. Bockman, S. N. Balakrishnan, Christopher D'Souza, James Cloutier
Target Profile Estimation Using Haar Functions, William R. Bockman, S. N. Balakrishnan, Christopher D'Souza, James Cloutier
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An approach to estimating the target acceleration in a maneuvering target model using Haar function partial summations to model the target acceleration is developed. A kinematic constraint is applied to the maneuvering target model and the effects of the use of this constraint are reviewed.
A Hybrid Observer For High Performance Brushless Dc Motor Drives, Keith Corzine, S. D. Sudhoff
A Hybrid Observer For High Performance Brushless Dc Motor Drives, Keith Corzine, S. D. Sudhoff
Electrical and Computer Engineering Faculty Research & Creative Works
Brushless DC motor drive systems are used in a wide variety of applications. These drives may be classified as being one of two types: sinusoidal drives in which there are no low-frequency harmonics in the current waveforms and no low-frequency torque ripple; and nonsinusoidal drives in which there is considerable low-frequency harmonic content, both in the current and torque waveforms. Although sinusoidal drives feature superior performance, they are generally more expensive since rotor position must be sensed on a continuous basis, thus requiring an optical encoder or a resolver, whereas relatively inexpensive Hall-effect sensors may be used for nonsinusoidal drives. …
Degradation Of Trichloroethylene By Methanol-Grown Cultures Of Methylosinus Trichosporium Ob3b Pp358, Mark W. Fitch, G. E. Speitel, G. Georgiou
Degradation Of Trichloroethylene By Methanol-Grown Cultures Of Methylosinus Trichosporium Ob3b Pp358, Mark W. Fitch, G. E. Speitel, G. Georgiou
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A Soluble Methane Monooxygenase-Constitutive Mutant Strain of Methylosinus Trichosporium OB3b, Strain PP358, Was Grown with Methanol as the Carbon Source, and the Kinetics of Trichloroethylene (TCE) Degradation Were Determined. PP358 Exhibited High TCE Degradation Rates under Both Oxygen- and Carbon-Limiting Conditions. the Optimal Pseudo First-Order Rate Constant for TCE Was Comparable to the Values Measured for Cells Grown with Methane. We Found that Growth under Oxygen-Limiting Conditions Results in Increased Accumulation of Polyhydroxybutyrate, Which in Turn Correlates with Higher Transformation Capacities for TCE. It Was Also Shown that Methanol Inhibits TCE Degradation Only at High Concentrations. Thus, Methanol-Grown Cultures of …
Compliant Pliers, Ashok Midha, S. C. Visser
Compliant Pliers, Ashok Midha, S. C. Visser
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The pliers include an endless loop, a top jaw appended to the endless loop, and a bottom jaw appended to the endless loop. The endless loop includes in series a top grip handle, a spring segment, a bottom grip handle and a compliant strip interconnecting the top and bottom grip handles. A rolling surface on the top grip handle rolls on a contact portion of the bottom grip handle. The rolling action causes the compliant strip to flex which causes the top and bottom jaws to move toward one another. The endless loop provides a built-in automatic spring and enhances …
Input Dimension Reduction In Neural Network Training-Case Study In Transient Stability Assessment Of Large Systems, S. Muknahallipatna, Badrul H. Chowdhury
Input Dimension Reduction In Neural Network Training-Case Study In Transient Stability Assessment Of Large Systems, S. Muknahallipatna, Badrul H. Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
The problem in modeling large systems by artificial neural networks (ANN) is that the size of the input vector can become excessively large. This condition can potentially increase the likelihood of convergence problems for the training algorithm adopted. Besides, the memory requirement and the processing time also increase. This paper addresses the issue of ANN input dimension reduction. Two different methods are discussed and compared for efficiency and accuracy when applied to transient stability assessment.
A Dual Neural Network Architecture For Linear And Nonlinear Control Of Inverted Pendulum On A Cart, S. N. Balakrishnan, Victor Biega
A Dual Neural Network Architecture For Linear And Nonlinear Control Of Inverted Pendulum On A Cart, S. N. Balakrishnan, Victor Biega
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The use of a self-contained dual neural network architecture for the solution of nonlinear optimal control problems is investigated in this study. The network structure solves the dynamic programming equations in stages and at the convergence, one network provides the optimal control and the second network provides a fault tolerance to the control system. We detail the steps in design and solve a linearized and a nonlinear, unstable, four-dimensional inverted pendulum on a cart problem. Numerical results are presented and compared with linearized optimal control. Unlike the previously published neural network solutions, this methodology does not need any external training, …
Treatability Of S-Triazine Herbicide Metabolites Using Powdered Activated Carbon, Craig D. Adams, Tammy L. Watson
Treatability Of S-Triazine Herbicide Metabolites Using Powdered Activated Carbon, Craig D. Adams, Tammy L. Watson
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Widespread use of s-triazine herbicides such as atrazine, simazine, and cyanazine has led to the contamination of many ground-water and surface-water supplies with the parent compounds as well as by primary metabolites (e.g., deethylatrazine, deisopropylatrazine, and deethylcyanazine). Ozonation has been shown to produce many of the same byproducts. Activated carbon adsorption has been designated by the U.S. Environmental Protection Agency as the best available technology (BAT) for the treatment of herbicides in drinking water. Little data is available, however, on the applicability of activated carbon treatment for the control of the primary degradation products of herbicides. In this study, the …
Computer Simulations Versus Real Experiments In A Portable Structural Mechanics Laboratory, Richard A. Behr
Computer Simulations Versus Real Experiments In A Portable Structural Mechanics Laboratory, Richard A. Behr
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Efforts are being made to develop practical and effective innovations for undergraduate engineering teaching laboratories. The 'ANEX' process, in which computer simulations are compared in nearly real time with physical measurements made on bench-scale model experiments, is now being used successfully in an introductory structural analysis course. ANEX is described, as well as current plans to develop software simulation modules and matched, bench-scale model experiments for new 'MECH-ANEX' laboratory applications in lower-division statics and mechanics of materials courses. The ANEX process could also be adapted to undergraduate laboratory applications in a wider range of engineering and science disciplines.
Sixth International Symposium On Chiral Discrimination, Daniel W. Armstrong
Sixth International Symposium On Chiral Discrimination, Daniel W. Armstrong
Chemistry Faculty Research & Creative Works
No abstract provided.
Capillary Electrophoretic Enantiomeric Separations Using The Glycopeptide Antibiotic, Teicoplanin, Kimber L. Rundlett, Mary P. Gasper, Eve Y. Zhou, Daniel W. Armstrong
Capillary Electrophoretic Enantiomeric Separations Using The Glycopeptide Antibiotic, Teicoplanin, Kimber L. Rundlett, Mary P. Gasper, Eve Y. Zhou, Daniel W. Armstrong
Chemistry Faculty Research & Creative Works
Teicoplanin is the third in a series of macrocyclic glycopeptide antibiotics that has been evaluated as a chiral selector in capillary electrophoresis (CE). It was used to resolve over 100 anionic racemates at low selector concentrations. Like the other related glycopeptide antibiotics, its enantioselectivity tends to be opposite to that of the ansa-type antibiotics which prefers cationic compounds-particularly amines. Factors that affect teicoplanin-based enantioseparations include the selector concentration, pH, and the concentration of the organic modifier. The temperature and the nature and strength of the buffer are also known to affect the stability of the chiral selector as well as …
Enantiomeric Composition And Prevalence Of Some Bicyclic Monoterpenoids In Amber, Daniel W. Armstrong, Eve Y. Zhou, Janusz Zukowski, Barbara Kosmowska-Ceranowicz
Enantiomeric Composition And Prevalence Of Some Bicyclic Monoterpenoids In Amber, Daniel W. Armstrong, Eve Y. Zhou, Janusz Zukowski, Barbara Kosmowska-Ceranowicz
Chemistry Faculty Research & Creative Works
Among the more prevalent chiral monoterpenoid compounds in conifers are α-pinene, β-pinene, and smaller amounts of camphene and limonene. The most prevalent chiral monoterpenoid compounds in fossilized resin (referred to as amber in this paper) appear to be borneol, isoborneol, and camphene. Most of these compounds have easily measured enantiomeric excesses. The borneol and isoborneol in some amber samples have pronounced enantiomeric excesses despite the fact that they are tens of millions of years old. The enantiomeric ratios of the monoterpenoids in different ambers vary tremendously and often are distinct. However, in any single amber sample, the stereochemistry (absolute configuration) …
Dynamics Of Poly(Vinyl Acetate) In Bulk And On Silica, Frank D. Blum, Gu Xu, Minghua Liang, Charles G. Wade
Dynamics Of Poly(Vinyl Acetate) In Bulk And On Silica, Frank D. Blum, Gu Xu, Minghua Liang, Charles G. Wade
Chemistry Faculty Research & Creative Works
Quadrupole echo deuterium NMR has been used to probe the dynamics of poly(vinyl acetate-d3) in bulk and at saturation coverage (from toluene) on silica at the solid-air interface. In bulk and at lower temperatures, the deuterium powder pattern of the labeled methyl group was found to be consistent with fast threefold jumps with a small asymmetry due to the interaction of the methyl deuteron with the carbonyl oxygen. This apparent asymmetry was a result either of a distortion in the C-C-D bond angle or a reduction of the axial symmetry of the electric field gradient along the C-D bond vector. …
Automatic Pcb Inspection Algorithms: A Survey, Madhav Moganti, Fikret Ercal, Cihan H. Dagli, Shou Tsunekawa
Automatic Pcb Inspection Algorithms: A Survey, Madhav Moganti, Fikret Ercal, Cihan H. Dagli, Shou Tsunekawa
Computer Science Faculty Research & Creative Works
The importance of the inspection process has been magnified by the requirements of the modern manufacturing environment. In electronics mass-production manufacturing facilities, an attempt is often made to achieve 100% quality assurance of all parts, subassemblies, and finished goods. A variety of approaches for automated visual inspection of printed circuits have been reported over the past two decades. In this survey, algorithms and techniques for the automated inspection of printed circuit boards are examined. A classification tree for these algorithms is presented and the algorithms are grouped according to this classification. This survey concentrates mainly on image analysis and fault …
Consensus Building Model To Select Casis In Small Communities, Steven W. Mccrary, Colin Othniel Benjamin, Vijay E. Ambavanekar
Consensus Building Model To Select Casis In Small Communities, Steven W. Mccrary, Colin Othniel Benjamin, Vijay E. Ambavanekar
Engineering Management and Systems Engineering Faculty Research & Creative Works
This paper examines: (1) The automated mapping/facilities management and geographic information system (AM/FM/GIS), which are called computer-assisted spatial information systems (CASIS) in this paper, software selection process; (2) develops a knowledge-based, multiattribute, multiobjective, consensus building model (CBM); and (3) establishes the validity for using the exogenously developed CBM for the selection of CASIS software. Model formulation is based on analyzing how well the attributes of the software meet user requirements in four areas: functionality, technical capability, vendor characteristics, and costs. Expert knowledge was gathered from several domain practitioners regarding the ability of GIS software functions to fulfill a user's needs. …
Stock Market Prediction Using Different Neural Network Classification Architectures, Karsten Schierholt, Cihan H. Dagli
Stock Market Prediction Using Different Neural Network Classification Architectures, Karsten Schierholt, Cihan H. Dagli
Engineering Management and Systems Engineering Faculty Research & Creative Works
In recent years, many attempts have been made to predict the behavior of bonds, currencies, stocks, or stock markets. The Standard and Poors 500 Index is modeled using different neural network classification architectures. Most previous experiments used multilayer perceptrons for stock market forecasting. A multilayer perceptron architecture and a probabilistic neural network are used to predict the incline, decline, or steadiness of the index. The results of trading with the advice given by the network is then compared with the maximum possible performance and the performance of the index. Results show that both networks can be trained to perform better …
The Missouri Miner, December 06, 1995
The Missouri Miner, December 06, 1995
The Missouri Miner Newspaper
No abstract provided.
Design Guide For Cold-Formed Steel Trusses, Steel In Residential Construction Advisory Group
Design Guide For Cold-Formed Steel Trusses, Steel In Residential Construction Advisory Group
CCFSS Library (1939 - present)
No abstract provided.
Calibration And Measurement Of Dielectric Properties Of Finite Thickness Composite Sheets With Open-Ended Coaxial Sensors, Stoyan I. Ganchev, Nasser N. Qaddoumi, Sasan Bakhtiari, R. Zoughi
Calibration And Measurement Of Dielectric Properties Of Finite Thickness Composite Sheets With Open-Ended Coaxial Sensors, Stoyan I. Ganchev, Nasser N. Qaddoumi, Sasan Bakhtiari, R. Zoughi
Electrical and Computer Engineering Faculty Research & Creative Works
The application of open-ended coaxial sensors for dielectric measurement of finite thickness composite sheets is studied. Expressions for calculation of the complex aperture admittance for two geometries are presented. These expressions are used to calculate the dielectric constant of infinite half-space as well as finite thickness slabs. A more efficient method of such calculations, using a personal computer, for low to medium loss dielectrics is demonstrated. The question of when a dielectric layer may be considered as infinitely thick is also addressed, and examples are presented. A different calibration technique (compared to the conventional ones) is described and successfully implemented. …
Upper-Tropospheric Aerosol Sampled During Project Fire Ifo Ii, Donald E. Hagen, Josef Podzimek, Max B. Trueblood
Upper-Tropospheric Aerosol Sampled During Project Fire Ifo Ii, Donald E. Hagen, Josef Podzimek, Max B. Trueblood
Physics Faculty Research & Creative Works
Aerosols can play a role in the cloud formation process through the heterogeneous nucleation mechanism, and in turn, once formed, cirrus clouds can impact the ambient aerosol through scavenging and other collection mechanisms. University of Missouri aerosol sampling facilities were employed on aircraft for in situ collection and characterization of the particulates near cirrus cloud level. Tandem differential mobility analyzer and impactor techniques were used to measure aerosol size distribution, hydration capability, and particle composition information. Evidence of aerosol layering was observed near the tropospause, and there was a tendency toward depletion of the ambient aerosol at both ends of …
The Effect Of Excitation Limits On Voltage Stability, Jyothi Ayyagari, Mariesa Crow
The Effect Of Excitation Limits On Voltage Stability, Jyothi Ayyagari, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
Voltage collapse has been commonly associated with insufficient reactive power support. Steady state studies have related reactive power generation limitations to the sudden onset of voltage instability. This paper extends this approach to the dynamic case. The relationship between the dynamic models and steady state behavior is established. The dynamic model is then used to investigate the sudden change in system stability when the maximum excitation limit is reached. Several illustrative examples are analyzed. Corrective actions are proposed which will move the physical system away from the region of instability.
The Missouri Miner, November 29, 1995
The Missouri Miner, November 29, 1995
The Missouri Miner Newspaper
No abstract provided.
The Missouri Miner, November 15, 1995
The Missouri Miner, November 15, 1995
The Missouri Miner Newspaper
No abstract provided.
The Missouri Miner, November 08, 1995
The Missouri Miner, November 08, 1995
The Missouri Miner Newspaper
No abstract provided.
A Magnetic, Neutron-Diffraction, And Mössbauer Spectral Study Of The Ce₂Fe₁₇₋ₓsiₓ Solid Solutions, D. P. Middleton, Sanjay R. Mishra, Gary J. Long, Oran Allan Pringle, Zhongbo Hu, William B. Yelon, Fernande Grandjean, K. H. J. Buschow
A Magnetic, Neutron-Diffraction, And Mössbauer Spectral Study Of The Ce₂Fe₁₇₋ₓsiₓ Solid Solutions, D. P. Middleton, Sanjay R. Mishra, Gary J. Long, Oran Allan Pringle, Zhongbo Hu, William B. Yelon, Fernande Grandjean, K. H. J. Buschow
Chemistry Faculty Research & Creative Works
The magnetic properties of a series of Ce2Fe17-xSix solid solutions with x equal to 0.0, 0.23, 0.4, 0.6, 0.8, 1.02, 1.98, and 3.20 have been studied by magnetic measurements, neutron diffraction, and Mössbauer spectroscopy. An x-ray-diffraction study indicates that the compounds adopt the rhombohedral Th2Zn 17-type structure. The substitution of silicon for iron in Ce 2Fe17 leads to a contraction of the a axis by 0.2%, an expansion of the c axis by 0.2%, and a consequent reduction of the unit-cell volume by about 0.2% per substituted silicon. Magnetization studies …
The Missouri Miner, November 01, 1995
The Missouri Miner, November 01, 1995
The Missouri Miner Newspaper
No abstract provided.
Size-Dependent Adsorption Models In Microporous Materials. 2. Comparison With Experimental Data, Manuela Giustiniani, Massimiliano Giona, Douglas K. Ludlow
Size-Dependent Adsorption Models In Microporous Materials. 2. Comparison With Experimental Data, Manuela Giustiniani, Massimiliano Giona, Douglas K. Ludlow
Chemical and Biochemical Engineering Faculty Research & Creative Works
In This Article, We Complete the Study of Size-Scaling Effects and of the Keller Model, presenting a Detailed Analysis of the Application of This Model to a Broad Range of Experimental Data on Microporous Materials (In Particular, Activated Carbon and Zeolites). Particular Attention is Focused on the Temperature Dependence of the Freundlich Exponents Αi, on the Functional Form of the Adsorption Energies, and on the Application of Keller Adsorption Isotherms in a Predictive Way to Generic Multicomponent Mixtures. © 1995, American Chemical Society. All Rights Reserved.
The Missouri Miner, October 25, 1995
The Missouri Miner, October 25, 1995
The Missouri Miner Newspaper
No abstract provided.
Diffusion In Inhomogeneous Polymer Membranes, Sameer Suresh Kasargod, Farhad Adib, Partho Neogi
Diffusion In Inhomogeneous Polymer Membranes, Sameer Suresh Kasargod, Farhad Adib, Partho Neogi
Chemical and Biochemical Engineering Faculty Research & Creative Works
The dual mode sorption solubility isotherms assume, and in instances Zimm-Lundberg analysis of the solubilities show, that glassy polymers are heterogeneous and that the distribution of the solute in the polymer is also inhomogeneous. under some conditions, the heterogeneities cannot be represented as holes. a mathematical model describing diffusion in inhomogeneous polymer membranes is presented using Cahn and Hilliard's gradient theory. the fractional mass uptake is found to be proportional to the fourth root of time rather than the square root, predicted by Fickian diffusion. This type of diffusion is classified as pseudo-Fickian. the model is compared with one experimental …