Engineering Commons^™

A Kinematically Intelligent Blackboard For Computer Aided Instruction, J. Keith Nisbett, D. Watkins, Clark R. Barker

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A CAI (computer-aided instruction) package is being developed to be used as a classroom tool for the instruction of undergraduate mechanical engineering students in an introductory kinematics of mechanisms course. This graphical environment allows the instructor to emulate on the projected graphics screen everything that is currently done on the blackboard for planar mechansims. Unlike the blackboard, the software will have the intelligence to interpret the drawings in a kinematic sense so that the drawing of the linkage will behave as a linkage. The software environment involves three principal components: (1) a sketching method for defining the linkage, (2) the …

Method Of Stemming A Blast Hole, Paul Nicholas Worsey

Mining Engineering Faculty Research & Creative Works

A method of stemming a blast hole loaded with an explosive charge. The blast hole has side walls, an outwardly opening mouth and a central axis extending longitudinally of the blast hole. The method comprises inserting a conduit having a discharge end inwardly through the mouth of the blast hole and positioning the discharge end of the conduit within the blast hole generally adjacent the explosive charge. Particulate stemming material is forced under pressure through the conduit for exit from its discharge end into the blast hole toward the explosive charge thereby to pack stemming material in the blast hole …

Two-Dimensional Simulation Of Switch-On Speeds In Hydrogenated Amorphous Silicon Thin-Film Transistors, J. S. Huang, Cheng-Hsiao Wu

Electrical and Computer Engineering Faculty Research & Creative Works

We report accurate two-dimensional simulations of switch-on speeds in hydrogenated amorphous silicon thin-film transistors. The trap charge density along, or transverse to, the direction of semiconductor channel is highly nonuniform and the trap filling time dominates the switching time as compared to the transit time, which is about four orders of magnitude smaller. Near both contacts, direction of the transverse current is always upwards toward the insulator-semiconductor interface due to the strong electric fields. However, at the central region of the channel, the transient current is quite complex and is discussed here. When the channel length varies from 2 to …

Identification Of Variegated Coloring In Skin Tumors: Neural Network Vs. Rule-Based Induction Methods, Ajaya Durg, William V. Stoecker, J. P. Cookson, Scott E. Umbaugh, Randy Hays Moss

Chemistry Faculty Research & Creative Works

The use of neural networks for automatic identification of variegated coloring, which is believed to be one of the most predictive features for malignant melanoma, is described. The Nestor development system (NDS) was chosen for neural network implementation. At the heart of NDS is a three-layer neural network called a restricted Coulomb energy (RCE) network. The learning scheme and the database for detection of variegated coloring are discussed. Results are reported

Transition Mechanisms Of Two Interacting Dx Centers In N-Type Algaas Using Reverse-Bias Deep Level Transient Spectroscopy And Temperature-Dependent Pulse-Width Reverse-Bias Deep Level Transient Spectroscopy Methods, C. W. Wang, Cheng-Hsiao Wu

Electrical and Computer Engineering Faculty Research & Creative Works

The reverse-bias pulsed deep level transient spectroscopy (RDLTS) and a new temperature-dependent pulse-width RDLTS (TDP RDLTS) technique are reported to study the electric-field effect on carrier emission rates and the direct interaction between double DX centers recently detected in the Se:Al_0.6Ga_0.4As N confinement layer of the AlGaAs/GaAs single-quantum-well laser diodes. Traditional RDLTS measurements, with constant pulse width t_p, prove that the two DX centers, Et₁ and Et₂, have strong direct emission interaction. Furthermore, the new TDP-RDLTS technique enables one to evaluate this direct transition time constant. Possible mechanisms for this interstate …

Dependence Of Binary Encounter Electron Production On The Charge State Of The Recoil Ion, Jee-Ching Wang, Ronald E. Olson, H. Wolf, J. Shinpaugh, W. Wolff, H. Schmidt Böcking

Chemical and Biochemical Engineering Faculty Research & Creative Works

We study the dependence of the production of binary encounter electrons on the charge state of recoil ions for 2.4 MeV u^-l Xe²¹⁺ on He and Ar. Doubly differential cross sections of electron emission are calculated with the ncrMC method. We find that the contributions to the binary electron cross section from various recoil ion charge states reach a maximum near Ar⁵⁺ for the Ar target. In the case of the He target; double ionization dominates over single ionization for alt ejected electron energies above 100 eV. However, an unexpected local drop of double ionization in the …

Ccfss Technical Bulletin August 1993, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

Ccfss News August 1993, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

An Energy Approach To Seismic Analysis And Design Of Secondary System, Genda Chen, Tsuteh Soong

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The dynamic analysis and design of secondary systems have been extensively studied over the last two decades, resulting in a better understanding of their general dynamic characteristics. One of the current challenges for researchers is to develop simple yet accurate procedures incorporating these research results and transfer them into the development of practical design and performance evaluation procedures. This is the basic thrust of this report.

Statistical energy analysis has been proven to be a powerful tool in the dynamic analysis of complex systems involving interaction effect between acoustic field and structure. In this report, such a tool is systematically …

A Study Of Numerically Efficient Algorithms For Power System Dynamic Analysis, J. G. Chen, Mariesa Crow

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, the multirate method is introduced to analyze power system behavior including linear and nonlinear systems with widely varying time constants. The development and study of time domain simulation techniques and error detection are discussed. The results, both in terms of accuracy and computation time, are compared to traditional simulation methods in a small nonlinear power system example

An Algorithm For Automated Printed Circuit Board Layout And Routing Evaluation, Todd H. Hubing, Thomas Van Doren, James L. Drewniak, Puneet Grover, R. Lee Hill

Electrical and Computer Engineering Faculty Research & Creative Works

An algorithm has been developed to evaluate printed circuit boards that are designed using automated board layout and routing software. The algorithm analyzes aspects of component placement and trace routing while searching for violations of basic EMC design principles. The algorithm is implemented in code designed to work with a widely used board layout and routing program. This code can help novice and experienced circuit board designers to avoid mistakes that may result in serious electromagnetic compatibility problems.

Method For Stripping Metals In Solvent Extraction, Thomas J. O'Keefe

Materials Science and Engineering Faculty Research & Creative Works

Aqueous solutions containing metal cations, that may include cations of both desired metal and impurity or secondary metal, are treated with an organic liquid extractant suitable for the extraction of cations of the desired metal, cations of at least one secondary metal being co-extracted. After phase disengagement, the loaded organic phase containing cations of either a desired metal or desired metal together with at least one secondary metal is contacted with a solid metal or solid metal alloy capable of reducing in the organic phase cations of either a desired metal or a secondary metal from a higher to a …

Design Of Automotive Structural Components Using High Strength Sheet Steels Effect Of Strain Rate On The Structural Strength And Crushing Behavior Of Cold-Formed Steel Stub Columns, Chi-Ling Pan, Wei-Wen Yu

CCFSS Library (1939 - present)

INTRODUCTION In the past, a considerable amount of theoretical and experimental research has been undertaken to study material properties and the behavior of structures under dynamic loads and impact loads. For the purpose of investigating the structural behavior and strength of cold-formed steel members under dynamic loads, a research project was conducted at the University of Missouri-Rolla from January 1988 through December 1991 to study the effect of strain rate on mechanical properties of sheet steels and the structural behavior and strength of cold-formed steel members. The test results of material properties, stub columns, and beams with evaluations were summarized …

Preliminary Design Guide For Cold-Formed Steel C- And Z-Members, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Conference Speakers, Multiple People

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Author Index Volume I And Ii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Meet Our Authors, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Meeting Minutes Of The Organizing And Steering Committees, Multiple Members

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

List Of Conference Participants, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Banquet Speeches, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Table Of Contents - Vol. I, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Table Of Contents - Vol. Ii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Ii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. I, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Conference Schedule, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Analysis Of Small Pipe Piles Using The Field Vane, G. A. Miller, A. J. Lutenegger

International Conference on Case Histories in Geotechnical Engineering

Results of axial compressive load tests on three small diameter pipe piles driven in a varved clay deposit are presented. Predictions of the axial pile capacity were made using the a-method originally proposed by Tomlinson (1957, 1971) and incorporating undrained strength profiles determined with the field vane. Predicted and measured capacities are compared and discussed in light of the various factors which can affect the outcome such as vane geometry, vane testing procedure and interpretation, pile load testing conditions, and empirical relationships incorporated in predictions.

Bearing Capacity And Load-Displacement Behavior Of Rigid Pads On Soft, Sensitive, Clay, R. J. Jardine, B. M. Lehane, P. R. Smith, P. A. Gildea

International Conference on Case Histories in Geotechnical Engineering

The paper describes tests on rigid square pads at the UK national soft clay research site at Bothkennar, Scotland. The work was performed as a low cost adjunct to the instrumented pile research described by Lehane and Jardine (1992). Its aims were to investigate (i} bearing capacity, (ii) load-displacement response to short and long term loading, (iii) the applicability of relevant theories and (iv) relationships between soil properties determined in-situ and those measured in high quality laboratory tests.

Behavior Of Laterally Loaded Drilled Shafts In Stiff Soil, A. J. Lutenegger, G. A. Miller

International Conference on Case Histories in Geotechnical Engineering

Results of lateral load tests on four drilled shafts installed in stiff cohesive soil are presented. Predictions of the load/displacement behavior were made using p-y curves generated from the results of Prebored Pressuremeter and Dilatometer Tests. A new method to develop p-y curves from the DMT is presented and discussed.

Caisson Foundations For Cellular Telephone Monopoles, Donald A. Benvie, Jeffrey B. Kirby

International Conference on Case Histories in Geotechnical Engineering

Design and construction procedures that were implemented for the installation of caisson foundations to support cellular telephone monopoles at fifteen sites throughout metropolitan New York are presented herein. Subsurface investigation procedures, development of geotechnical design criteria, methods of structural analysis and caisson design, and actual construction installation of the caissons have been provided along with a comparison of soil conditions and their impact on design and construction of the caissons.

Case Histories Of Bored Pile Foundations, T. Z. Rao

International Conference on Case Histories in Geotechnical Engineering

A kind of bored pile with large diameter is being used in civil engineering in China. The maximum length in earth of the pile is greater than 100 m. This pile may be built in rock. In the paper, the constructing methods of the bored pile foundation of a bridge and a grade separation are described. Relating the result with its cause, the failure of the bored pile in construction, the cause of the failure and the treatment methods are related.