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https://www.readbyqxmd.com/read/28333431/ultrahigh-self-sensing-performance-of-geopolymer-nanocomposites-via-unique-interface-engineering
#1
Shuguang Bi, Ming Liu, Jingjing Shen, Xiao Matthew Hu, Liying Zhang
Monitoring and assessment of the health of a civil structural material are the critical requirements to ensure its safety and durability. In this work, a coating strategy on carbon nanotubes (CNTs) was employed for the dispersion of CNTs in geopolymer matrix. The geopolymer nanocomposites prepared exhibited ultrahigh self-sensing performance based on the unique behaviors of SiO2 coating on CNTs in the geopolymer matrix. The SiO2 layer on CNTs was partially or fully removed during the fabrication process to restore the conductive nature of CNTs, facilitating the dispersion of CNTs and forming well-connected 3D electrical conductive networks...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28325702/construction-of-an-interim-storage-field-using-recovered-municipal-solid-waste-incineration-bottom-ash-field-performance-study
#2
Laura Annika Sormunen, Pauli Kolisoja
The leaching of hazardous substances from municipal solid waste incineration (MSWI) bottom ash (BA) has been studied in many different scales for several years. Less attention has been given to the mechanical performance of MSWI BA in actual civil engineering structures. The durability of structures built with this waste derived material can have major influence on the functional properties of such structures and also the potential leaching of hazardous substances in the long term. Hence, it is necessary to properly evaluate in which type of structures MSWI BA can be safely used in a similar way as natural and crushed rock aggregates...
March 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28301973/beneficial-reuse-of-brest-harbor-france-dredged-sediment-as-alternative-material-in-road-building-laboratory-investigations
#3
Walid Maherzi, Mahfoud Benzerzour, Yannick Mamindy-Pajany, Eleanor Van Veen, Mohamed Boutouil, Edine Abriak Nor
ABSRACT The scarcity of natural aggregates promotes waste reuse as secondary raw material in the field of civil engineering. This article focuses on the beneficial reuse of marine dredged sediments in road building. Thus, mixtures of raw sediments and dredged sand collected from Brest Harbour (Bretagne, France) were treated with road hydraulic binders. Formulation were prepared and characterized as recommended by the French Technical Guidelines for soil treatment with lime and/or hydraulic binders. Mechanical resistance results are quite similar for the both hydraulic binders suggesting a similar reactivity with the studied sediment sample...
March 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28275277/attitudes-of-students-of-differenet-schools-of-university-of-zagreb-on-tooth-bleaching
#4
Dinka Diklić, Eva Klarić Sever, Nada Galić, Jelena Spajić, Katica Prskalo
OBJECTIVE: To compare the awareness that students from four different faculties within the University of Zagreb have of oral health and tooth bleaching procedure. MATERIALS AND METHODS: The study included 158 subjects (both male and female) - 38 students from the School of Dental Medicine and 40 students from each of the following faculties: the School of Medicine, the Faculty of Economics and the Faculty of Civil Engineering. The respondents were asked to fill out the survey with multiple choices by marking the answers they considered correct...
December 2016: Acta Stomatologica Croatica
https://www.readbyqxmd.com/read/28241503/measurement-of-the-length-of-installed-rock-bolt-based-on-stress-wave-reflection-by-using-a-giant-magnetostrictive-gms-actuator-and-a-pzt-sensor
#5
Mingzhang Luo, Weijie Li, Bo Wang, Qingqing Fu, Gangbing Song
Rock bolts, as a type of reinforcing element, are widely adopted in underground excavations and civil engineering structures. Given the importance of rock bolts, the research outlined in this paper attempts to develop a portable non-destructive evaluation method for assessing the length of installed rock bolts for inspection purposes. Traditionally, piezoelectric elements or hammer impacts were used to perform non-destructive evaluation of rock bolts. However, such methods suffered from many major issues, such as the weak energy generated and the requirement for permanent installation for piezoelectric elements, and the inconsistency of wave generation for hammer impact...
February 23, 2017: Sensors
https://www.readbyqxmd.com/read/28181083/environmental-impact-assessment-in-higher-education-institutions-in-east-africa-the-case-of-rwanda
#6
Telesphore Kabera
Due to the pressure on limited resources produced by a growing population and due to a decade of war, Rwanda is facing a major problem in environmental protection. Because of such problems, it seems only reasonable that environment-related courses should play an important role in the curricula of institutions of higher learning. The main aim of this research is to present a comprehensive picture of Environmental Impact Assessment (EIA) integration in graduate and undergraduate programs in Rwandese higher education institutions and to make recommendations for its improvement...
February 8, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28160172/arsenic-uptake-accumulation-and-toxicity-in-rice-plants-possible-remedies-for-its-detoxification-a-review
#7
Hafiz Faiq Bakhat, Zahida Zia, Shah Fahad, Sunaina Abbas, Hafiz Mohkum Hammad, Ahmad Naeem Shahzad, Farhat Abbas, Hesham Alharby, Muhammad Shahid
Arsenic (As) is a toxic metalloid. Serious concerns have been raised in literature owing to its potential toxicity towards living beings. The metalloid causes various water- and food-borne diseases. Among food crops, rice contains the highest concentrations of As. Consuming As-contaminated rice results in serious health issues. Arsenic concentration in rice is governed by various factors in the rhizosphere such as availability and concentration of various mineral nutrients (iron, phosphate, sulfur and silicon) in soil solution, soil oxidation/reduction status, inter-conversion between organic and inorganic As compounds...
February 3, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28157961/relative-change-measurement-of-physical-quantities-using-dual-wavelength-coherent-otdr
#8
Sascha Liehr, Yonas Seifu Muanenda, Sven Münzenberger, Katerina Krebber
We propose the use of alternating pulse wavelengths in a direct-detection coherent optical time domain reflectometry (C-OTDR) setup not only to measure strain and temperature changes but also to determine the correct algebraic sign of the change. The sign information is essential for the intended use in distributed mode shape analysis of civil engineering structures. Correlating relative backscatter signal shifts in the temporal/signal domain allows for measuring with correct magnitude and sign. This novel approach is simulated, experimentally implemented and demonstrated for temperature change measurement at a spatial resolution of 1 m...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28047960/tu-b-206-02-on-the-algorithmic-approach-to-ethical-conduct
#9
G Sherouse
PURPOSE: To reacquaint the participant with foundational aspects of educational, healthcare and research ethics as they relate to the Medical Physicist day to day role. METHODS: Presenting recognized best practice guidelines and tenants applied to hypothetical scenarios and medical physics related occupations. RESULTS: The application of recognized standards of ethical behavior result in beneficial outcomes for all involved CONCLUSION: Ethics is multi-faceted in its manifestation application; most facets are applicable to any avenue a medical physicist may pursue in their career...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047387/tu-b-206-00-do-the-right-thing
#10
Jeffrey Limmer
PURPOSE: To reacquaint the participant with foundational aspects of educational, healthcare and research ethics as they relate to the Medical Physicist day to day role. METHODS: Presenting recognized best practice guidelines and tenants applied to hypothetical scenarios and medical physics related occupations. RESULTS: The application of recognized standards of ethical behavior result in beneficial outcomes for all involved CONCLUSION: Ethics is multi-faceted in its manifestation application; most facets are applicable to any avenue a medical physicist may pursue in their career...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046722/tu-b-206-01-navigating-the-black-white-and-gray
#11
J Limmer
PURPOSE: To reacquaint the participant with foundational aspects of educational, healthcare and research ethics as they relate to the Medical Physicist day to day role. METHODS: Presenting recognized best practice guidelines and tenants applied to hypothetical scenarios and medical physics related occupations. RESULTS: The application of recognized standards of ethical behavior result in beneficial outcomes for all involved CONCLUSION: Ethics is multi-faceted in its manifestation application; most facets are applicable to any avenue a medical physicist may pursue in their career...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27999245/tapered-polymer-fiber-sensors-for-reinforced-concrete-beam-vibration-detection
#12
Dong Luo, Zainah Ibrahim, Jianxun Ma, Zubaidah Ismail, David Thomas Iseley
In this study, tapered polymer fiber sensors (TPFSs) have been employed to detect the vibration of a reinforced concrete beam (RC beam). The sensing principle was based on transmission modes theory. The natural frequency of an RC beam was theoretically analyzed. Experiments were carried out with sensors mounted on the surface or embedded in the RC beam. Vibration detection results agreed well with Kistler accelerometers. The experimental results found that both the accelerometer and TPFS detected the natural frequency function of a vibrated RC beam well...
December 16, 2016: Sensors
https://www.readbyqxmd.com/read/27996051/engineered-metabarrier-as-shield-from-seismic-surface-waves
#13
Antonio Palermo, Sebastian Krödel, Alessandro Marzani, Chiara Daraio
Resonant metamaterials have been proposed to reflect or redirect elastic waves at different length scales, ranging from thermal vibrations to seismic excitation. However, for seismic excitation, where energy is mostly carried by surface waves, energy reflection and redirection might lead to harming surrounding regions. Here, we propose a seismic metabarrier able to convert seismic Rayleigh waves into shear bulk waves that propagate away from the soil surface. The metabarrier is realized by burying sub-wavelength resonant structures under the soil surface...
December 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27983707/low-cost-gnss-receivers-for-local-monitoring-experimental-simulation-and-analysis-of-displacements
#14
Ludovico Biagi, Florin Cătălin Grec, Marco Negretti
The geodetic monitoring of local displacements and deformations is often needed for civil engineering structures and natural phenomena like, for example, landslides. A local permanent GNSS (Global Navigation Satellite Systems) network can be installed: receiver positions in the interest area are estimated and monitored with respect to reference stations. Usually, GNSS geodetic receivers are adopted and provide results with accuracies at the millimeter level: however, they are very expensive and the initial cost and the risk of damage and loss can discourage this approach...
December 15, 2016: Sensors
https://www.readbyqxmd.com/read/27908010/information-theoretical-noninvasive-damage-detection-in-bridge-structures
#15
Amila Sudu Ambegedara, Jie Sun, Kerop Janoyan, Erik Bollt
Damage detection of mechanical structures such as bridges is an important research problem in civil engineering. Using spatially distributed sensor time series data collected from a recent experiment on a local bridge in Upper State New York, we study noninvasive damage detection using information-theoretical methods. Several findings are in order. First, the time series data, which represent accelerations measured at the sensors, more closely follow Laplace distribution than normal distribution, allowing us to develop parameter estimators for various information-theoretic measures such as entropy and mutual information...
November 2016: Chaos
https://www.readbyqxmd.com/read/27876858/multi-functional-carbon-fibre-composites-using-carbon-nanotubes-as-an-alternative-to-polymer-sizing
#16
T R Pozegic, J V Anguita, I Hamerton, K D G I Jayawardena, J-S Chen, V Stolojan, P Ballocchi, R Walsh, S R P Silva
Carbon fibre reinforced polymers (CFRP) were introduced to the aerospace, automobile and civil engineering industries for their high strength and low weight. A key feature of CFRP is the polymer sizing - a coating applied to the surface of the carbon fibres to assist handling, improve the interfacial adhesion between fibre and polymer matrix and allow this matrix to wet-out the carbon fibres. In this paper, we introduce an alternative material to the polymer sizing, namely carbon nanotubes (CNTs) on the carbon fibres, which in addition imparts electrical and thermal functionality...
November 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27858175/an-information-based-machine-learning-approach-to-elasticity-imaging
#17
Cameron Hoerig, Jamshid Ghaboussi, Michael F Insana
An information-based technique is described for applications in mechanical property imaging of soft biological media under quasi-static loads. We adapted the Autoprogressive method that was originally developed for civil engineering applications for this purpose. The Autoprogressive method is a computational technique that combines knowledge of object shape and a sparse distribution of force and displacement measurements with finite-element analyses and artificial neural networks to estimate a complete set of stress and strain vectors...
November 18, 2016: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/27816181/acoustic-emission-in-orthopaedics-a-state-of-the-art-review
#18
Richard A Kapur
Acoustic emission (AE) is the phenomenon of sonic and ultrasonic wave generation by materials as they undergo deformation and fracture processes. AE monitoring is widely used throughout civil and mechanical engineering as a highly sensitive and non-destructive technique for structural health monitoring. Advances in computational power and digital data storage have generated much further interest in the possible applications of AE technology. Of particular interest has been its application within the field of Orthopaedic surgery...
December 8, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27791981/advancing-alternative-analysis-integration-of-decision-science
#19
REVIEW
Timothy F Malloy, Virginia M Zaunbrecher, Christina Batteate, Ann Blake, William F Carroll, Charles J Corbett, Steffen Foss Hansen, Robert Lempert, Igor Linkov, Roger McFadden, Kelly D Moran, Elsa Olivetti, Nancy Ostrom, Michelle Romero, Julie Schoenung, Thomas Seager, Peter Sinsheimer, Kristina Thayer
BACKGROUND: Decision analysis-a systematic approach to solving complex problems-offers tools and frameworks to support decision making that are increasingly being applied to environmental challenges. Alternatives analysis is a method used in regulation and product design to identify, compare, and evaluate the safety and viability of potential substitutes for hazardous chemicals. OBJECTIVES: Assess whether decision science may assist the alternatives analysis decision maker in comparing alternatives across a range of metrics...
October 28, 2016: Environmental Health Perspectives
https://www.readbyqxmd.com/read/27770323/environmental-characterisation-of-sewage-sludge-paper-ash-based-composites-in-relation-to-their-possible-use-in-civil-engineering
#20
Ana Mladenovič, Sandra Hamler, Nina Zupančič
The environmental acceptability of geotechnical composites made of treated municipal sewage sludge (SwS) and paper ash (PA) after two different curing periods has been investigated. The mineral composition of such composites, including their content of major oxides, is mainly influenced by the PA. The content of potentially toxic elements (PTEs) in the initial materials and in the composites varies considerably. In the SwS the Ba, Cd, Cr, Cu, Hg, Ni and Zn contents are above the legally permitted limits. The PTE content of PA are lower, but still somewhat above the permitted values for Ba and Cu...
January 2017: Environmental Science and Pollution Research International
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