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Displaying 4976 - 5000 of 13217

Chapter 1. Important Developments in the History of Ionic Liquids from Academic Curiosity to Commercial Processes and Products

February 14, 2020
Author(s)
Joe W. Magee, Mark B. Shiflett, Dirk Tuma
… a few chemists and even fewer engineers were interested in salts with melting points near room temperature. In April 2000, the first NATO advanced research workshop on ionic liquids was held in Heraklion, Crete. The conference was the first … Chapter 1. Important Developments in the History of Ionic Liquids from Academic Curiosity to …

Mechanical properties of single-walled carbon nanotube reinforced polymer composites with varied interphases modulus and thickness: A finite element analysis study

January 8, 2016
Author(s)
Dilip K. Banerjee, Tinh Nguyen, Tze-Jer Chuang
… the CNT and the matrix, the predicted modulus values are in good agreement with those computed by the rule of mixtures and with theoretical data reported in the literature, although the predicted values are … proved that fracture stress of the weak boundary layer in the CNT/polymer interphase is lower than that of the …

Single-Photon Sources and Detectors Book: Chapter 1: Introduction

November 29, 2013
Author(s)
Joshua C. Bienfang, Jingyun Fan, Alan L. Migdall, Sergey V. Polyakov
… In the beginning there was light. And it was good. Not long … While the publication record starts o a little spotty, in the fth century BC the Greek philosopher Empedocles … be characterized as a local realism argument by Euclid in his classic text on light propagation Optica. Euclid …

2009 Performance Metrics for Intelligent Systems (PerMIS'09) Workshop

July 9, 2010
Author(s)
Rajmohan Madhavan, Elena R. Messina
… the pace of advancement for intelligent systems?" In addition to the main theme, as in previous years, the workshop focused on applications of performance measures to practical problems in commercial, industrial, homeland security, and military … performance evaluation, intelligent systems, benchmarking, technology readiness …

Role of Nanoparticles in Life Cycle of Nanocomposites

June 15, 2010
Author(s)
Xiaohong Gu, Guodong Chen, Minhua Zhao, Stephanie S. Watson, Paul E. Stutzman, Tinh Nguyen, Joannie W. Chin, Jonathan W. Martin
… this study is to investigate the role of ZnO nanoparticles in the life cycle of a waterborne polyurethane (PU) … by Fourier Transform Infrared Spectroscopy (FTIR). Changes in surface morphology were characterized by atomic force … (e.g., size and loading). It appears that the polymers in the vicinity of the nanoparticles would be preferentially …

Virtual Testing of Concrete Transport Properties

October 1, 2009
Author(s)
Dale P. Bentz, Edward J. Garboczi, Nicos Martys, Kenneth A. Snyder, W. S. Guthrie, Konstantinos Kyritsis, Narayanan Neithalath
… on ionic diffusivity, sorptivity, and permeability. In this paper, virtual testing of two of these concrete … Two recent successful evaluations will be presented in this paper: the permeability of cement pastes … Building technology, diffusion, durability, microstructure, …

Internal Curing Improves Concrete Performance throughout its Life

September 1, 2009
Author(s)
Ryan Henkensiefken, Javier Castro, Haejin Kim, Dale P. Bentz, Jason Weiss
… and promote hydration. While early research in this area focused on reductions in early-age deformation and cracking, recent efforts have … properties such as sorptivity and diffusion coefficients. In addition, the water provided by the internal reservoirs … Building technology, durability, hydration, internal curing, …

Degradation and Nanofiller Release of Polymer Nanocomposites Exposed to UV

July 15, 2009
Author(s)
Tinh Nguyen, Bastien T. Pellegrin, Alexander J. Shapiro, Xiaohong Gu, Joannie W. Chin
… ultraviolet (UV) radiation, nanofillers that are embedded in a polymer nanocomposite will eventually be released into … epoxy underwent rapid photodegradation, resulting in substantial mass loss and increase in MWCNTs and nanosilica concentrations at the composite …

Thermal Performance of Fire Resistive Materials III. Fire Test on a Bare Steel Column

April 1, 2009
Author(s)
Dale P. Bentz, Leonard M. Hanssen, Boris Wilthan
… This report is part III in an ongoing series concerning the characterization and … thermal performance of fire resistive materials (FRMs). In part I, a methodology for characterizing FRMs to provide … inputs for thermal performance models was outlined, and in part II, one such multi-layer model was demonstrated for …

Nanoscale Characterization of Coatings Surface Degradation With Tapping Mode Atomic Force Microscopy

October 16, 2008
Author(s)
Tinh Nguyen, Xiaohong Gu, Mark R. VanLandingham, R Ryntz, D Nguyen, Jonathan W. Martin
… [1-3]. This paper presents examples from the research in our laboratory on the use of both the phase and topographic imaging in tapping mode AFM (TMAFM) to investigate early surface … of coatings exposed to weathering environments. In tapping mode AFM, the probe is oscillated at a frequency …

Four-Dimensional X-Ray Microtomography Study of Water Movement During Internal Curing

August 9, 2006
Author(s)
Dale P. Bentz, P M. Halleck, A S. Grader, J W. Roberts
… observation of water movement during internal curing in four dimensions (three spatial dimensions and time) has … the possibility to dynamically monitor density changes in a material, during its curing process, for example. In this paper, this technique is applied to monitoring water …

Mitigation Strategies for Autogenous Shrinkage Cracking

August 1, 2004
Author(s)
O M. Jensen
… early-age cracking have become prominent. The reduction in w/c ratio, the incorporation of silica fume, and the increase in binder content of high performance concretes all contribute to this problem. In this paper, the fundamental parameters contributing to the …

Measurement of Water Transport from Saturated Pumice Aggregates to Hardening Cement Paste

August 6, 2003
Author(s)
Pietro Lura, Dale P. Bentz, D Lange, K Kovler, A Bentur, K Van Breugel
… In this study about internal curing of High Performance … to hydrating cement pastes (w/c ratio 0.3) took place in the first days after casting and covered a distance of at … rather than the spatial distribution of the aggregates, is in this case the crucial factor to avoid early-age …

A Hurricane Damage Prediction Model for Residential Structures

July 1, 2003
Author(s)
A Cope, K Gurley, James J. Filliben, Emil Simiu, J P. Pinelli, C Subramanian, L. Zhang, S Hamid
… the prediction of structural damage due to hurricane winds in the state of Florida. This is a necessary component to a … application for a specific building classification common in Florida. … Conference on Applications of Statistics and Probability in Civil Engineering …

A Model to Predict Hurricanes Induced Losses for Residential Structures

June 1, 2003
Author(s)
J P. Pinelli, C Subramanian, L. Zhang, K Gurley, A Cope, Emil Simiu, S M. Diniz, S Hamid
… estimated wind speeds. The damage modes are then combined in possible damage states, whose probabilities of occurrence … building technology, damage, hurricanes, losses, residential …

Meteorological Extremes

July 1, 2002
Author(s)
Emil Simiu
… ocean waves. Modern treatments of EV theory are covered in detail by Castillo [5] and Beirlant et al. [4]. … Building Technology, environmetrics, ice, meteorological extremes, …

Structural Reliability Estimates and Database-Assisted Design for Wind

June 1, 2002
Author(s)
F Minciarelli, Fahim H. Sadek, Emil Simiu, Mircea Grigoriu
… estimates of extreme wind effects and load factors in standard provisions for wind loads. We obtained the … distributions of extreme wind speeds; (2) the disregard in the ASCE 7-98 Standard of (a)knowledge uncertainties, and (b) errors inherent in the limited number of climatological data on which …

The Stereological and Statistical Properties of Entrained Voids in Concrete: A Mathematical Basis for Air Void System Characterization

December 1, 2001
Author(s)
Kenneth A. Snyder, K C. Hover, K Natesaiyer
… and statistical properties of entrained air voids in concrete have often involved a number of steps: sample … spatial statistics. Each of these steps has been discussed in detail by a number of engineering fields. For the civil … air-void spacing, air-void system, building technology, concrete …

Drying/Hydration in Cement Pastes During Curing

November 1, 2001
Author(s)
Dale P. Bentz, K K. Hansen, H D. Madsen, F A. Vallee, E J. Griesel
… As concrete cures in the field, there is a constant competition for the mixing … processes. Understanding the mechanisms of water movement in the drying/hydrating cement paste is critical for … well as for selecting repair materials and methodologies. In this work, X-ray absorption measurements indicate that …

Estimates of Extreme Wind Effects and Wind Load Factors: Influence of Knowledge Uncertainties

October 1, 2001
Author(s)
F Minciarelli, M Gioffre, Mircea Grigoriu, Emil Simiu
… methodology for developing improved load factors in standard provisions for wind loads, and use it to examine: the cause of the discrepancy noted in the 1980s between estimates of safety indices for wind and … estimates of safety indices for gravity and wind loads in an artifact that can be removed by using current knowledge …
Displaying 4976 - 5000 of 13217
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