Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

133,877 Full-Text Articles 152,031 Authors 44,573,586 Downloads 281 Institutions

All Articles in Engineering

Faceted Search

133,877 full-text articles. Page 3435 of 3717.

Evaluating The Lrfd Factor For Cold-Formed Steel Compression Members, Karthik Ganesan, Christopher D. Moen 2010 Missouri University of Science and Technology

Evaluating The Lrfd Factor For Cold-Formed Steel Compression Members, Karthik Ganesan, Christopher D. Moen

International Specialty Conference on Cold-Formed Steel Structures

This paper summarizes recent work to determine if the LRFD resistance factor for cold-formed steel compression member s can be increased above its current value of φ c =0.85. An experimental database of 675 concentrically loaded columns with plain and lipped C-sections, plain and lipped Z-sections, hat sections and angle sections, including members with holes was compiled. The predicted strength of each specimen was calculated with the AISI-S100-07 Main Specification and Direct Strength Method (DSM). Test-to-predicted strength statistics were employed with the first order second moment reliability approach in AISI-S100-07 Chapter F to calculate the resistance factors. The observed ...


Cyclic Elastoplastic Large Displacement Analysis Of Cold-Formed Steel Box Columns Under Combined Action Of Axial And Bidirectional Lateral Loading, Iraj H. P. Mamaghani, Saman Montazeri 2010 Missouri University of Science and Technology

Cyclic Elastoplastic Large Displacement Analysis Of Cold-Formed Steel Box Columns Under Combined Action Of Axial And Bidirectional Lateral Loading, Iraj H. P. Mamaghani, Saman Montazeri

International Specialty Conference on Cold-Formed Steel Structures

This paper deals with the cyclic elastoplastic large displacement analysis of cold-formed steel box columns under combined action of axial and bidirectional lateral loading. Cold-formed steel box columns are very useful in highway bridge pier construction as they offer flexible space requirement and provide speedy construction. Behavior of cold-formed steel box columns under earthquake-induced loads is rather complicated as earthquakes occur in an oblique direction. However, modern seismic design philosophies have been based on the behavior of structures under independent actions of uni-directional loading in orthogonal directions. In this study, inelastic cyclic behavior of steel columns subjected to constant axial ...


Buckling Analysis Of Cold-Formed Steel Members With General Boundary Conditions Using Cufsm Conventional And Constrained Finite Strip Methods, Z. Li, B. W. Schafer 2010 Missouri University of Science and Technology

Buckling Analysis Of Cold-Formed Steel Members With General Boundary Conditions Using Cufsm Conventional And Constrained Finite Strip Methods, Z. Li, B. W. Schafer

International Specialty Conference on Cold-Formed Steel Structures

The objective of this paper is to provide the theoretical background and illustrative examples for elastic buckling analysis of cold-formed steel members with general boundary conditions as implemented in the forthcoming update to CUFSM. CUFSM is an open source finite strip elastic stability analysis program freely distributed by the senior author. Although the finite strip method presents a general methodology, the conventional implementation (e.g. CUFSM v 3.13 or earlier) employs only simply-supported boundary conditions. In this paper, utilizing specially selected longitudinal shape functions, the conventional finite strip method is extended to general boundary conditions, including the conventional case ...


Theoretical Analysis Of Cold-Formed Steel Battened Double Angle Members Under Compression, W. F. Maia, J. Munaiar Neto, M. Malite 2010 Missouri University of Science and Technology

Theoretical Analysis Of Cold-Formed Steel Battened Double Angle Members Under Compression, W. F. Maia, J. Munaiar Neto, M. Malite

International Specialty Conference on Cold-Formed Steel Structures

In Brazil, battened double angle system is one of the systems most used in light truss, however, there are not any specific studies on its behavior, resulting in the fact that the standard procedures do not provide subsidies for the design of this section. Moreover, cold-formed steel si mple angles under compression, mostly with slender legs, have an interesting structural behavior compared to other cold-formed steel shapes. Two critical modes are observed in the elastic stability analysis: (i) global flexural mode in the case of longer members and (ii) a coincident local-plate/global flexural-torsional mode, which is critical for shorter ...


Performance Of Knee-Braced Cold-Formed Steel Shear Walls Subjected To Lateral Cyclic Loading, Mehran Zeynalian Dastjerdi, Hamid Reza Ronagh 2010 Missouri University of Science and Technology

Performance Of Knee-Braced Cold-Formed Steel Shear Walls Subjected To Lateral Cyclic Loading, Mehran Zeynalian Dastjerdi, Hamid Reza Ronagh

International Specialty Conference on Cold-Formed Steel Structures

Light weight Steel Framed structures currently in use in Australia, are normally braced using face mounted thin straps, cross braces that are of the same shape as studs, or compressed cement boards screwed to the face of the walls. While these are found adequate in low seismic regions of Australia, an investigation into the earthquake resistance properties of LSF have led authors to investigate alternative bracing types that may present a more favourable ductility. Knee braces that are specially designed for this purpose are introduced in the paper and studied in a specially designed testing rig. The tests are on ...


Mimo Channel Spatial Covariance Estimation: Analysis Using A Closed-Form Model, Yanling Yang 2010 Brigham Young University - Provo

Mimo Channel Spatial Covariance Estimation: Analysis Using A Closed-Form Model, Yanling Yang

All Theses and Dissertations

Multiple-input Multiple-output (MIMO) wireless communication systems allow increased spectral efficiency and therefore promise significant improvement in performance. However, because of the rapid variation in channel state information (CSI) in networks with mobile nodes or scatterers, it is difficult both to maintain high communication performance and to create channel models that effectively represent the time-varying behavior of the channels. The spatial covariance of the MIMO channel describes the average power gain on each transmit-receive antenna pair as well as the correlation between the complex link gains and thus provides critical information for understanding the performance of the system and for creating ...


Endogenous Sirnas And Noncoding Rna-Derived Small Rnas Are Expressed In Adult Mouse Hippocampus And Are Up-Regulated In Olfactory Discrimination Training., Neil Smalheiser, G Lugli, Jyothi Thimmapuram, E.H. Cook, J Larson 2010 University of Illinois at Chicago

Endogenous Sirnas And Noncoding Rna-Derived Small Rnas Are Expressed In Adult Mouse Hippocampus And Are Up-Regulated In Olfactory Discrimination Training., Neil Smalheiser, G Lugli, Jyothi Thimmapuram, E.H. Cook, J Larson

Cyber Center Publications

We previously proposed that endogenous siRNAs may regulate synaptic plasticity and long-term gene expression in the mammalian brain. Here, a hippocampal-dependent task was employed in which adult mice were trained to execute a nose-poke in a port containing one of two simultaneously present odors in order to obtain a reward. Mice demonstrating olfactory discrimination training were compared to pseudo-training and nose-poke control groups; size-selected hippocampal RNA was subjected to Illumina deep sequencing. Sequences that aligned uniquely and exactly to the genome without uncertain nucleotide assignments, within exons or introns of MGI annotated genes, were examined further. The data confirm that ...


14 - تخمين نرخ تهويه ي‌ بهينه براي کيفيت مناسب هواي داخل با توجه به نرخ نفوذ هوا و عملکرد وسايل احتراقي, Chamran Nowrouzi, Mehdi Maerefat, Alireza Zolfaghari 2010 University of Birjand

14 - تخمين نرخ تهويه ي‌ بهينه براي کيفيت مناسب هواي داخل با توجه به نرخ نفوذ هوا و عملکرد وسايل احتراقي, Chamran Nowrouzi, Mehdi Maerefat, Alireza Zolfaghari

Dr Alireza Zolfaghari

No abstract provided.


Call For Papers Of Iceea10, Toufik Rekioua Pr 2010 SelectedWorks

Call For Papers Of Iceea10, Toufik Rekioua Pr

REKIOUA Djamila Dr

We are pleased to announce that we are organizing an international conference on electrical engineering, electronics and Automatic (ICEEA'10) which will take place in Bejaia (Algeria) on 2-3 November 2010 (see call for papers)


Thyme: A Database For Thioester-Active Enzymes, David C. Cantu, Yingfei Chen, Matthew L. Lemons, Peter J. Reilly 2010 Iowa State University

Thyme: A Database For Thioester-Active Enzymes, David C. Cantu, Yingfei Chen, Matthew L. Lemons, Peter J. Reilly

Chemical and Biological Engineering Publications

The ThYme (Thioester-active enzYme;http://www.enzyme.cbirc.iastate.edu) database has been constructed to bring together amino acid sequences and 3D (tertiary) structures of all the enzymes constituting the fatty acid synthesis and polyketide synthesis cycles. These enzymes are active on thioester-containing substrates, specifically those that are parts of the acyl-CoA synthase, acyl-CoA carboxylase, acyl transferase, ketoacyl synthase, ketoacyl reductase, hydroxyacyl dehydratase, enoyl reductase and thioesterase enzyme groups. These groups have been classified into families, members of which are similar in sequences, tertiary structures and catalytic mechanisms, implying common protein ancestry. ThYme is continually updated as sequences and tertiary ...


Application Of Differential Evolution To Determine The Hepwm Angles Of A Three Phase Voltage Source Inverter, N Bahari, Z. Salam, Taufik 2010 Universiti Teknologi Malaysia

Application Of Differential Evolution To Determine The Hepwm Angles Of A Three Phase Voltage Source Inverter, N Bahari, Z. Salam, Taufik

Electrical Engineering

This paper presents an efficient Differential Evolution (DE) based solution for harmonic elimination pulse-width modulation (HEPWM). The aim is to solve for the set of transcendental equations that determine the switching angles of the HEPWM waveform. The objective function of the DE is designed to minimize (to near zero) the selected harmonics and at the same time allows for the fundamental component of the output voltage to be controlled independently. To verify the method, simulation is carried out using MATLAB simulink. The computed switching angles are applied to a three phase voltage source inverter. Typical results are shown and discussed.


Evaluation Of The Stress-Energy Methodology To Predict Transmitted Shock Through Expanded Foam Cushions, J. Singh, L. Ignatova, E. Olsen, P. Singh 2010 California Polytechnic State University - San Luis Obispo

Evaluation Of The Stress-Energy Methodology To Predict Transmitted Shock Through Expanded Foam Cushions, J. Singh, L. Ignatova, E. Olsen, P. Singh

Industrial Technology and Packaging

Mechanical stresses experienced by packages in the distribution environment include shock and vibration amongst several others. The destructive effects of these hazards can typically be restricted by using cushioning materials to help protect fragile goods during distribution. ASTM D1596 is the conventional standard used to determine shock absorbing performance of a cushioning material for a given combination of static loading, thickness, and drop height. This industry-accepted standard, however, requires significant amounts of transmitted shock data and can be expensive with respect to costs associated with testing and materials amongst others. Alternate stress-energy-based methodologies, developed in the past decade, recommending a ...


Convergence Rate Analysis Of Distributed Gossip (Linear Parameter) Estimation: Fundamental Limits And Tradeoffs, Soummya Kar, José M. F. Moura 2010 Carnegie Mellon University

Convergence Rate Analysis Of Distributed Gossip (Linear Parameter) Estimation: Fundamental Limits And Tradeoffs, Soummya Kar, José M. F. Moura

Department of Electrical and Computer Engineering

This paper considers gossip distributed estimation of a (static) distributed random field (a.k.a., large-scale unknown parameter vector) observed by sparsely interconnected sensors, each of which only observes a small fraction of the field. We consider linear distributed estimators whose structure combines the information flow among sensors (the consensus term resulting from the local gossiping exchange among sensors when they are able to communicate) and the information gathering measured by the sensors (the sensing or innovations term). This leads to mixed time scale algorithms-one time scale associated with the consensus and the other with the innovations. The paper establishes ...


A Model-Based Design Approach For Wireless Sensor-Actuator Networks, Anthony G. Rowe, Gaurav Bhatia, Raj Rajkumar 2010 Carnegie Mellon University

A Model-Based Design Approach For Wireless Sensor-Actuator Networks, Anthony G. Rowe, Gaurav Bhatia, Raj Rajkumar

Department of Electrical and Computer Engineering

In this paper, we propose a model-based design approach for developing wireless sensor-actuator networks that can map multiple sets of application-level interactions onto a single networking substrate while still enforcing individual requirements. We use a top-down design approach where the functional requirements for each application are graphically modeled using a tool called SysWeaver. Sensor networking applications add unique challenges for model-based design frameworks because the system deployment view is tightly coupled to an installation-specific network topology and link characteristics. Wireless devices can also be mobile and hence may not easily map to standard deployment views. We introduce a SysWeaver plugin ...


Determining The Electronic Properties Of Individual Nanointerfaces By Combining Intermittent Afm Imaging And Contact Spectroscopy, Ramsey A. Kraya, Dawn A. Bonnell 2010 University of Pennsylvania

Determining The Electronic Properties Of Individual Nanointerfaces By Combining Intermittent Afm Imaging And Contact Spectroscopy, Ramsey A. Kraya, Dawn A. Bonnell

Departmental Papers (MSE)

A method to determine the electronic properties at nanointerfaces or of nanostructures by utilizing intermittent contact atomic force microscopy and contact spectroscopy in one system is developed. By combining these two methods, the integrity of the interface or structure is maintained during imaging, while the extraction of the electronic information is obtained with contact spectroscopy. This method is especially vital for understanding interfaces between metal nanoparticles and substrates, where the nanoparticles are not tethered to the surface and can be combined with new and evolving techniques of thermal drift compensation to allow for a larger range of experiments on nanointerfaces ...


Production Of Anatomical Models From Ct Scan Data, John Brennan 2010 Dublin Institute of Technology

Production Of Anatomical Models From Ct Scan Data, John Brennan

Other resources

Rapid Prototyping (RP) technology was conceived in the mid 1980s as a method of manufacturing models, particularly to support the design of new motor vehicles. However as early as 1995 the potential to take data from medical scanners and generate models of patient anatomy to assist clinicians plan complex surgical procedures had been recognised, albeit by researchers rather than the mainstream medical industry. Over the last 15 years the production of preoperative planning models has increased dramatically and moreover, the potential to produce customised implants recognised.

Although RP technology is now established in the medical field work is still on ...


Shifting Grounds: How Industry Emergence Changes The Effectiveness Of Knowledge Creation Strategies - The Case Of The U.S. Automotive Airbag Industry, Sebastian K. Fixson, Won Hee Lee 2010 Babson College

Shifting Grounds: How Industry Emergence Changes The Effectiveness Of Knowledge Creation Strategies - The Case Of The U.S. Automotive Airbag Industry, Sebastian K. Fixson, Won Hee Lee

Technology, Operations & Information Management Working Papers

This paper investigates the effect industry life cycle phase shifts have on the effectiveness of firms’ knowledge creation strategies. Building on literature streams on strategic knowledge management and industry life cycles, we develop theoretical arguments for why the best knowledge search strategy should be different before the emergence of an industry compared to afterwards. Testing our hypotheses empirically in the emerging U.S. automotive airbag industry confirms the powerful forces of industry emergence: the best knowledge search strategy is initially one that looks inward into the organization but outside of the technology area, and later shifts to one that is ...


Kennedy Interchange Crash Study, Eric R. Green, Kenneth R. Agent, Jerry G. Pigman 2010 University of Kentucky

Kennedy Interchange Crash Study, Eric R. Green, Kenneth R. Agent, Jerry G. Pigman

Kentucky Transportation Center Research Report

The Louisville-Southern Indiana Ohio River Bridges project is a construction and reconstruction project being undertaken to address long-term transportation needs in the Louisville metropolitan area. Partial justification for construction of the new downtown bridge and reconstruction of the Kennedy interchange is the existing safety issues and the potential for improved safety. Crash rates for the interchange area have not been fully documented to establish the existing level of safety and degree of the problem relative to state and national statistics. The objective of this study was to analyze and evaluate crash data for the Kennedy Interchange area of Louisville and ...


Subharmonic Behavior Of Phospholipid-Coated Ultrasound Contrast Agent Microbubbles, Jeroen Sijl, Benjamin Dollet, Marlies Overvelde, Valeria Garbin, Timo Rozendal, Nico deJong, Detlef Lohse, Michel Versluis 2010 University of Twente

Subharmonic Behavior Of Phospholipid-Coated Ultrasound Contrast Agent Microbubbles, Jeroen Sijl, Benjamin Dollet, Marlies Overvelde, Valeria Garbin, Timo Rozendal, Nico Dejong, Detlef Lohse, Michel Versluis

Departmental Papers (CBE)

Coated microbubbles, unlike tissue are able to scatter sound subharmonically. Therefore, the subharmonic behavior of coated microbubbles can be used to enhance the contrast in ultrasound contrast imaging. Theoretically, a threshold amplitude of the driving pressure can be calculated above which subharmonic oscillations of microbubbles are initiated. Interestingly, earlier experimental studies on coated microbubbles demonstrated that the threshold for these bubbles is much lower than predicted by the traditional linear viscoelastic shell models. This paper presents an experimental study on the subharmonic behavior of differently sized individual phospholipid coated microbubbles. The radial subharmonic response of the microbubbles was recorded with ...


Visualization Queries, Nicholas Del Rio, Paulo Pinheiro da Silva 2010 University of Texas at El Paso

Digital Commons powered by bepress