Digital Commons Network^™

Difi: Digital And Fiber, Wendy Angel

SWITCH

This article discusses the similarities between the histories of digital technologies and textiles. The author describes the ways that digital and fiber technologies are affected by the growing arts and cultures. The author provides details of how digital and fiber technologies are both used as signal-transmitting information media. The article describes the importance of both digital and fiber in societal standing, the power and status it generates, and how they separates the wealthy and the working class. The article closes with an interpretative analysis of the interwoven properties between industry, information, technology, and art.

The Need For Emphasis On Teaching The Content Of Certain Subject Areas And Teaching Concepts Related To Certain Packaging Industry Job Titles As Perceived By Packaging Professionals In Indiana And The Surrounding States, Marion D. Schafer

All-Inclusive List of Electronic Theses and Dissertations

The study investigates the opinions or packaging professionals about an appropriate curriculum for a Bachelor of Science degree program in packaging. The study was conducted by surveying packaging profossionals randomly seleclcd from the Central Indiana Institute of Packaging Professionals mailing list. This list was made up mostly of Indiana residents but included a few residents from the fhur surrounding slates. The study was initiated as a first step in the process of developing appropri.ite improvements to the curriculum for the Bachelor of Science degree in packaging al Indiana State University. Six packaging job titles and twenty-three su~jcct areas were chosen …

Modeling Dc Power-Bus Structures With Vertical Discontinuities Using A Circuit Extraction Approach Based On A Mixed-Potential Integral Equation, Jun Fan, Hao Shi, Antonio Orlandi, James L. Knighten, James L. Drewniak

Electrical and Computer Engineering Faculty Research & Creative Works

The DC power-bus is a critical aspect in high-speed digital circuit designs. A circuit extraction approach based on a mixed-potential integral equation is presented herein to model arbitrary multilayer power-bus structures with vertical discontinuities that include decoupling capacitor interconnects. Green's functions in a stratified medium are used and the problem is formulated using a mixed-potential integral equation approach. The final matrix equation is not solved, rather, an equivalent circuit model is extracted from the first-principles formulation. Agreement between modeling and measurements is good, and the utility of the approach is demonstrated for DC power-bus design.

Scattering Of Elastic Waves In Heterogeneous Media With Local Isotropy, Joseph A. Turner, Phanidhar Anugonda

Nebraska Center for Materials and Nanoscience: Faculty Publications

The scattering of elastic waves in heterogeneous media is discussed. Explicit expressions are derived for the attenuation of longitudinal and transverse elastic waves in terms of the statistics of the density and Lame´ parameter fluctuations. The derivation is based upon diagrammatic methods with the problem posed in terms of the Dyson equation. The Dyson equation is solved for the mean field response. The results are given here in a straightforward manner, in which the attenuations reduce to simple integrals on the unit circle. The medium is assumed statistically homogeneous and statistically isotropic. This model, with assumed local isotropic properties, is …

Design And Analysis For Melt Casting Metallic Fuel Pins Incorporating Volatile Actinides, Yitung Chen, Darrell Pepper, Randy Clarksean

Fuels Campaign (TRP)

UNLV investigators will evaluate and select a process for the melt casting of metallic fuel pins that contain volatile actinides. This work will be performed with the guidance of Argonne National Laboratory (ANL) engineers to insure that their knowledge and experience benefits the project. The research to be conducted during year one will center on selecting, evaluating, and modeling potential alternatives to the traditional injection casting process used at ANL. Processing conditions will be analyzed, basic models utilized, and detailed heat and mass transfer models will be developed to analyze the most promising processes. The goal of the first year …

Ultra High Density Storage Media And Method Thereof, Ravi F. Saraf

Department of Chemical and Biomolecular Engineering: Patents

A storage media for storing information having a substrate. The substrate has an upper surface and a molecular weight greater than 5,000. Preferably the material is a polymer. The material has a plurality of piles of molecular chains in selected areas formed by pushing the molecular chains of the material on its upper surface to the selected area mechanically with a mechanical tool. The piles represent written information. The mechanical tool is preferably an atomic force microscope. Another aspect of the present invention is a method for storing information having the steps of selecting a material substrate having an upper …

The Airline Quality Rating 2001, Brent D. Bowen, Dean Headley, Uno Aviation Institute

Faculty Books and Monographs

UNOAI Report 01-2

The Airline Quality Rating (AQR) was developed and first announced in early 1991 as an objective method of comparing airline quality on combined multiple performance criteria. This current report, Airline Quality Rating 2001, reflects monthly Airline Quality Rating scores for 2000. AQR scores for the calendar year 2000 are based on 15 elements that focus on airline performance areas important to air travel consumers.

The Airline Quality Rating 2001 is a summary of month-by-month quality ratings for the ten major U.S. airlines operating during 2000. Using the Airline Quality Rating system of weighted averages and monthly performance …

Santa Clara Magazine, Volume 42 Number 4, Spring 2001, Santa Clara University

Santa Clara Magazine

3 - EL SOL SHINED IN 1968 STUDENT ELECTIONS By Adam Breen. During the 1968 campus elections, an electrical engineering student felt the student body was too apathetic, so he ran for dictator to spur interest. He could have been king, but instead had himself "assassinated " for a greater cause.

12 - DOUBLE LIVES By Susan Vogel. An economic boom in Silicon Valley created opportunities, jobs, and wealth-but those who work here often can't afford to live here. What are employees and employers doing about it?

16 - THE GLACIER PRIEST By Jeff Kunkel. Bernard Hubbard, S.J., was more …

On Multifunctional Collaborative Methods In Engineering Science, Jonathan B. Ransom Sr.

Mechanical & Aerospace Engineering Theses & Dissertations

Engineers are challenged to produce better designs in less time and for less cost. Hence, to investigate novel and revolutionary design concepts, accurate, high-fidelity data must be assimilated rapidly into the design, analysis and simulation process. This data assimilation should consider diverse mathematical modeling and multi-discipline interactions necessitated by concepts exploiting advanced materials and structures. Integrated high-fidelity methods with diverse engineering applications provide the enabling technologies to assimilate these high-fidelity, multi-disciplinary data rapidly at an early stage in the design. These integrated methods must be multifunctional, collaborative and applicable to the general field of engineering science and mechanics.

Multifunctional methodologies …

Cfd Modeling Of Multiphase Flow Distribution In Catalytic Packed Bed Reactors: Scale Down Issues, Y. Jiang, Mohan R. Khadilkar, Muthanna H. Al-Dahhan, Milorad P. Dudukovic

Chemical and Biochemical Engineering Faculty Research & Creative Works

Flow Maldistribution in Either a Bench-Scale or Commercial Scale Packed Bed is Often Responsible for the Failure of the Scale Down Unit to Mimic the Performance of the Large Reactor. the Modeling of Multiphase Flow in a Bench-Scale Unit is Needed for Proper Interpretation of Reaction Rate Data Obtained in Such Units. Understanding the Mechanism of Flow Maldistribution is the First Step to Avoiding It. in Order to Achieve This Objective, Computational Fluid Dynamic (CFD) Simulations of Multiphase Flow under Steady State and Unsteady State Conditions in Bench-Scale Cylindrical and Rectangular Packed Beds Are Presented for the First Time. the …

Seismic Soil Structure Interaction Analyses Of An Office Building In Oakland, California, Joseph Wartman, Shahriar Vahdani, Linda Liang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper discusses soil-structure interaction (SSI) analyses for a 10-story office building with three levels of basement (10 meters) located in downtown Oakland, California. The objectives of these analyses were to assess the effects of SSI on the response of the building and to develop ground-level input earthquake motions at the base of the building for use by the project structural engineer. The SSI analyses were conducted using the two-dimensional finite element program FLUSH. The results of these analyses indicate that SSI has a negligible effect on horizontal ground motions at and near the building’s predominant period (T ~ 1.8 …

Identification Of Different Seismic Waves Generated By Foundation Vibration In The Centrifuge: Travel Time, Spectral And Numerical Investigations, Jean-Louis Chazelas, Odile Abraham, Jean-François Semblat

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

For the analysis of footings under dynamic loading scaled modeling in the centrifuge assumes that the soil behaves like at prototype scale. This paper demonstrates that for a container filled with dry sand, wave velocities can be described by a model based on the relation between the shear modulus and the depth dependent stress level proposed by Iwasaki and Tatsuoka. A preliminary estimation of the shear wave velocities and of the Poisson’s ratio confirms by dynamical measurements the currently use value of 0.25. A FEM modeling also helps to strengthen the validity of the model proposed, providing another insight in …

Non-Linear Modeling Of Dip-Slip Faults Using Applied Element Method, Pradeep Kumar Ramancharla, Kimiro Meguro

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

On observing the recent big earthquakes that have occurred in Turkey (M.7.4, 1999.8.17) and Taiwan (M.7.3, 1999.9.21), it is understood that the differential ground displacement is also responsible for the failure of structures. Now, it is understood that there is a need to channelize the research interests to study the failure propagating mechanism through the soil deposit. Numerous researchers have attempted to study this phenomenon through, experiments for understanding the effects of seismic fault mechanism and soil deposit parameters on surface deformation characteristics. However, from the widespread damage caused by the recent events, it is now clear that the earthquakes …

An Effective Local Absorbing Boundary For 3d Fem Time Domain Analyses, Lindita Kellezi, Hirokazu Takemiya

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The aim of this paper is to investigate and develop alternative methods for analyzing transient problems in dynamic soil-structure interaction, (SSI) within the FEM context. Development of a simple and efficient FEM procedure for the solution directly in the time domain of SSI problems is the main issue. Considering Direct Method of analysis, a new formulation of local transmitting boundaries for transient three-dimensional (3D) FEM analysis is presented based on the radiation criterion and strength-of- materials theory. These numerical devices can be considered as doubly asymptotic, (DA) approximations and are given in terms of first order differential operators. Different formulations …

Radius-Managing Urban Earthquake Risk In Developing Countries, Carlos Villacís, Cynthia Cardona

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The IDNDR launched the RADIUS initiative to reduce the effects of seismic disasters in urban areas, particularly in developing countries. This initiative had two concrete objectives: 1) development of seismic damage scenarios and earthquake risk management plans for nine selected cities worldwide, and 2) development of practical tools for urban seismic risk management using the results of the case studies. Additionally, the project had three specific objectives for each of the selected cities: to 1) raise awareness, both locally and internationally, of the city's seismic risk, 2) incorporate all the sectors of the community in the risk management activities, and …

A Project To Study Urban Earthquake Risk Worldwide, Cynthia Cardona, Rachel Davidson, Carlos Villacís

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In 1998, the Secretariat of the International Decade for Natural Disaster Reduction (IDNDR) and GeoHazards International (GHI) launched the understanding Urban Seismic Risk around the World (UUSRAW) project. The 18-month project established an internet network of 74 seismically active cities worldwide to compare their earthquake hazard and to share their experiences and resources in working to reduce the impact of future earthquakes. In each city, a local scientist or municipal officer gathered the information necessary to conduct the comparative assessment using the Earthquake Disaster Risk Index (Davidson, 1997), a composite index used to assesses risk based on several factors. The …

Similarity Rule For Dynamic Model Tests Of Geotechnical Structures, Gao Lin

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Soils and rocks are characterized by their highly nonlinear behaviors. This makes it very difficult to ensure similarity between model and prototype for dynamic model tests of geotechnical structures. In reality, a great number of such tests were carried out qualitatively, and valuable information was missed. Based on fairly long time practice and experience of performing dynamic model tests, we get some new ideas to establish similarity relationships between model and real earth structures. It is noticed that during strongly inelastic shaking, peak crest acceleration of earth and rock-fill dams decreases with increasing base excitation, finally at near failure stage …

Near Source Strong Ground Motion Simulation For Kocaeli Earthquake (1999), Abdullah Can Zulfikar, Hirokazu Takemiya

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A near field strong ground motion simulation was carried out due to fault rupturing in the Kocaeli Earthquake (1999). The ground motions are simulated by the convolution scheme in time for source function and in space along rupture direction with the layered soil Green's function method based on the kinematic dislocation model. The effects of the asperities in the fault rupturing are focused considering inhomogeneous rupture mechanism in terms of a multiple asperities. The synthetic motions based on the inversion information from the observed data are compared well with the YPT (Yarimca Petrochemical Complex) record of the Kocaeli Earthquake. The …

Seismic Microzonation Of Central Khartoum, Sudan, Yahia E.-A. Mohamedzein, Jamal A. Abdalla, Ahmed M. Elsharief, Abu Bakr Abdelwahab, Elfatih O. Ahmed

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A preliminary seismic microzonation of Central Khartoum, Sudan is proposed. Khartoum, the capital of Sudan, is located at the confluence of White and Blue Niles. The city is heavily populated. The Central Khartoum with its high rise buildings is the center of governmental and business activities and is located on strip adjacent to the Blue Nile. Geological and geotechnical data indicated that the subsoil conditions at Central Khartoum are characterized by alluvial deposits underlain by Nubian Sandstone below a depth of 20 m. The alluvial deposits locally known as Gezira formations, consist of clays grading into silt and sand with …

General Report — Session 6: Soil-Structure Interaction Under Dynamic Loading For Both Shallow And Deep Foundations, M. K. Yegian, C. Y. Chang, Chris L. Mullen, George Mylonakis

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

General Report — Session 10: Case Histories Of Geotechnical Earthquake Engineering, Failures, And Geotechnical Analysis Of Recent Earthquakes, Jonathan D. Bray, Marshall Lew, Yung-Show Fang, H. W. Yang, Masayuki Hyodo, Shigeru Tani

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

Motion Amplification In Horizontal And Vertical Components At Liquefiable Sites, Jun Yang, Tadanobu Sato, Xiang-Song Li

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper describes an analytical study with the purpose to gain some new understandings of the behavior of motion amplification in both horizontal and vertical components at liquefiable sites. By using a verified, effective-stress based nonlinear procedure, a series of numerical tests of a liquefiable sand deposit subjected to simultaneous action of horizontal and vertical shaking of various levels are carried out. To account for the characteristics of near-source motion, realistic array records of strong motion due to the Kobe earthquake of 1995 are employed to produce a variety of intensities of input motion in horizontal and vertical components. An …

Numerical And Experimental Simulation Of Seismic Site Responses, Xian Tao, Takaaki Kagawa, Akio Abe

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Prediction of seismic site responses has been one of the most important tasks in geotechnical earthquake engineering. Since Kanai used the multiple wave reflection theory to compute horizontal ground movements against seismic shaking, a number of researchers have extended the basic concept proposed by Kanai. Performance of seismic site response methods, however, has always invited open questions for problems involving extreme seismic shaking and large deformation of soils due, for example, to liquefaction and lateral spreading. A new numerical method SRANG3D (Site Response Analysis of Non-linear Ground in 3 Dimensions) has been developed to improve our prediction capabilities for seismic …

Seismic Amplification Of Typical New York City Soil Profiles, Sissy Nikolaou, Peter Edinger

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Amplification studies for New York City (NYC) soil sites are summarized herein. Ten (10) typical soil profiles from Brooklyn, Queens, and Manhattan, are analyzed using one-dimensional SHAKE methods. Dynamic soil properties are derived using state-of-practice correlations with standard penetration resistance and compared to available in-situ geophysical measurements. Three different rock motions are utilized, each modified from real records to match 500- and 2500-year probabilistic spectra. Results are presented in terms of dimensionless ratios of response spectra (RRS) and surface response spectra. The effect of the impedance contrast between soil and rock on soil amplification is examined. It is shown that …

Modeling Uncertainty In Seismic Stability And Earthquake Induced Displacement Of Earth Slopes Under Short Term Conditions, Azm S. Al-Homoud, Wisam W. Tahtamoni

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Different models were developed for evaluating the probabilistic three-dimensional (3-D) stability analysis of earth slopes and embankments under earthquake loading using both the safety factor and the displacement criteria of slope failure. These models are formulated and incorporated within a computer program (PTDDSSA). The probabilistic models evaluate the probability of failure under seismic loading considering the different sources of uncertainties involved in the problem. A sensitivity analysis was conducted on the different parameters involved in the developed models by applying those models to a well-known landslides (Congress Street) under different levels of seismic hazard. The hypocentral distance and earthquake magnitude …

Earthquake-Induced Spalling Of Rock Slopes, Northridge Earthquake, January 17, 1994 — A Case Study, David Cummings

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The 1994 Northridge earthquake (M_w=6.7, ML=6.4), southern California produced a 100-foot thick, 3,000-foot linear zone of fractures interpreted as a spalled slab near the crest of a ridge in the Simi Hills, 7 miles northwest of the epicenter. The strike and dip of the slab parallel the strike of the ridge and the dip of the topographic slope, respectively. The fractures cut across bedding and joint planes. An analytical model based on earthquake-induced stresses is used to describe the mechanism of spalling. Earthquake-induced tensile stresses are related to (I) propagation direction of the wavefront, (2) peak particle velocity, …

Large Motion Assessment In Soils Under Dynamic Loading, E. Foerster, H. Modaressi

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents the mathematical formulation of the nonlinear multiphase dynamic model meant for porous media, obtained by applying the finite transformation assumption. This assumption is appropriate when large motions take place either during mass wasting processes, such as large slumps and earthflows, or during earthquake events when site liquefaction occurs and results for instance in large irrecoverable settlements or lateral spreads. The weak formulation and numerical implementation of the dynamic model uses the mesh-free h-p clouds method, which is based on the more general Partition of Unity Method. The mesh-free numerical methods seem indeed to be more appropriate for …

Effects Of Dynamic Properties Of Rockfill Materials On Seismic Response Of Concrete-Faced Rockfill Dams, Xingzheng Wu, Maotian Luan, Junxia Xin

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In this paper, the equivalent-linear method is used for three-dimensional seismic response analyses of concrete-faced rockfill dams (CFRDs). Different combinations of various parameters such as small-strain shear modulus, strain-dependent patterns of modulus and hysteretic damping, are considered to systematically investigate the effects of dynamic properties of rockfill-type coarse-grained materials on seismic dynamic response of CFRDs. It is concluded that the nonlinearity of embankment material has a significant effect on both vibration characteristics and seismic response behavior of CFRDs. Numerical results presented are instructive to gain a better understanding on earthquake-resistant behavior of CFRDs and the effects of dynamic properties of …

Using Discontinuous Deformation Analysis To Investigate The Dynamic Stability Of Tunnels In Jointed Rocks Under Earthquake Loading, Reza Naderi, Nader Hataf, Arsalan Ghahramani

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Tunneling is one of the most important problems in rock mechanics that many numerical methods try to investigate. In general, static analysis methods are mainly used to investigate the stability of tunnels, which are not safe in dynamic conditions. This paper is illustrating the use of Discontinuous Deformation Analysis (DDA) in analyzing the stability of tunnels in jointed rocks under earthquake loading. To improve the capability of original DDA method to meet the requirements for analysis of rock tunnels under dynamic loading and time dependent (time history) loading, damping and energy loss have been added to the program. Some numerical …

Seismic Response Of Normally Consolidated Cohesive Soils In Gently Inclined Submerged Slopes, Giovanna Biscontin, Juan M. Pestana, Farrokh Nadim, Knut Andersen

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The geological profile of submerged slopes on the continental shelf typically includes soft cohesive soils with layer thicknesses ranging from a few meters to tens or hundreds of meters. The response of these soils in simple shear tests is largely influenced by the presence of an initial consolidation shear stress, inducing anisotropic stress-strain-strength properties which depend also on the direction of shear. In this paper, a new simplified effective-stress-based model describing the behavior of normally to lightly overconsolidated cohesive soils is used in conjunction with a one-dimensional seismic site response analysis computer code to illustrate the importance of accounting for …