Characterization of Topside Mechanical Damage

2014 ◽  
Author(s):  
Rick Yahua Wang ◽  
Richard Kania ◽  
Udayasankar Arumugam ◽  
Ming Gao
Keyword(s):  
Metal Removal ◽  
Mechanical Damage ◽  
Third Party ◽  
Signal Recognition ◽  
Pipe Surface ◽  
Industry Standards ◽  
External Forces ◽  
Severity Criterion ◽  
Hardened Surface

Mechanical damage, such as gouge, is the damage to the pipe surface caused by external forces and is usually caused by third-party damage during construction and excavation. This normally results in a highly deformed, work hardened surface layer with possible metal removal. In many cases, dents are coincident with gouges. Industry standards and regulators treat this type of mechanical damage as critical and require immediate investigation. Therefore, from a pipeline operator perspective, distinguishing between plain dent and dent with gouge is a great challenge for topside dents because quite often they are caused by un-authorized third party activity and contain gouge. In a previous study[1,2], the present authors developed an approach that combines dent strain-severity criterion with MFL signal recognition to identify dent with gouge and crack. In this paper, an extension of the previous study to topside dents is presented. The enhanced approach for distinguishing between plain dents and dent with gouge/crack for topside dents is summarized. Case studies are given to demonstrate the effectiveness of the approach for identify topside dent with gouge.

Synthesis and characterization of diphenylamine grafted onto sodium alginate for metal removal

2021 ◽  
Vol 167 ◽  
pp. 766-776
Author(s):  
Asmaa Ahmed ◽  
Fatma Mohamed ◽  
Ali M. Elzanaty ◽  
Omayma F. Abdel-Gawad
Keyword(s):  
Sodium Alginate ◽  
Metal Removal ◽  
Synthesis And Characterization

THE LOGICAL STRUCTURE OF LINGUISTIC THEORY: البنية المنطقية للنظرية اللسانية: ستيفن ر. أندرسون، جامعة ييل

2021 ◽  
Vol 5 (13) ◽  
pp. 112-90
Author(s):  
Ranya Ahmed Rashid Shaheen, Abdelrahman Mudawi Abdelrahim Al Ranya Ahmed Rashid Shaheen, Abdelrahman Mudawi Abdelrahim Al
Keyword(s):  
Natural Language ◽  
Logical Structure ◽  
Linguistic Theory ◽  
Baldwin Effect ◽  
Language Faculty ◽  
Human Ability ◽  
External Forces ◽  
The Baldwin Effect ◽  
Communicative Abilities

The object of inquiry in Linguistics is the human ability to acquire and use a natural language, and the goal of linguistic theory is an explicit characterization of that ability. Looking at the communicative abilities of other species, it becomes clear that our linguistic ability is specific to our species, undoubtedly a product of our biology. But how do we go about determining the specifics of this Language faculty? _here are two primary ways in which we infer the nature of Language from the properties of individual languages: arguments from the Poverty of the Stimulus, and the search for universals that characterize every natural language. Arguments of the first sort are not easy to construct (though not as difficult as sometimes suggested), and apply only to a tiny part of Language as a whole. Arguments from universals or typological generalizations are also quite problematic. In phonology, morphology, and syntax, factors of historical development, functional underpinnings, limitations of the learning situation, among others conspire to compromise the explanatory value of arguments from observed cross-linguistic regularities. Confounding the situation is the likelihood that properties found across languages as a consequence of such external forces have been incorporated into the Language faculty evolutionarily through the ‘Baldwin Effect.’ _e conflict between the biologically based specificity of the human Language faculty and the difficulty of establishing most of its properties in a secure way cannot, however, be avoided by ignoring or denying the reality of either of its poles.

Uncertainty Characterization of the CrCOD Circumferential Crack Opening Displacement Module for xLPR

2015 ◽  
Author(s):  
Richard Olson ◽  
Paul Scott
Keyword(s):  
Crack Opening Displacement ◽  
Crack Opening ◽  
Opening Displacement ◽  
Crack Face ◽  
Pipe Surface ◽  
Circumferential Crack ◽  
The Us ◽  
Experimental Values ◽  
Metal Weld

The US NRC/EPRI xLPR (eXtremely Low Probability of Rupture) probabilistic pipe fracture analysis program uses deterministic modules as the foundation for the calculation of the probability of pipe leak or rupture as a consequence of active degradation mechanisms, vibration or seismic loading. The circumferential crack opening displacement module, CrCOD, estimates crack opening displacement (COD) at the inside pipe surface, at the mid-wall thickness location, and at the outside pipe surface using a combined tension/crack face pressure/bending GE/EPRI-like solution. Each module has an uncertainty beyond the uncertainty of the xLPR data inputs. This paper documents the uncertainty for CrCOD. Using 36 pipe fracture experiments, including: base metal, similar metal weld, and dissimilar metal weld experiments; bend only and pressure and bend loading; static and dynamic load histories; cracks that range from short to long, the uncertainty of the CrCOD methodology is characterized. Module uncertainty is presented in terms mean fit and standard deviation between prediction and experimental values.

scholarly journals Studies on coccidian oocysts (Apicomplexa: Eucoccidiorida)

2014 ◽  
Vol 23 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Bruno Pereira Berto ◽  
Douglas McIntosh ◽  
Carlos Wilson Gomes Lopes
Keyword(s):  
Molecular Biology ◽  
Mechanical Damage ◽  
Species Description ◽  
Critical Overview

The oocysts of the coccidia are robust structures, frequently isolated from the feces or urine of their hosts, which provide resistance to mechanical damage and allow the parasites to survive and remain infective for prolonged periods. The diagnosis of coccidiosis, species description and systematics, are all dependent upon characterization of the oocyst. Therefore, this review aimed to the provide a critical overview of the methodologies, advantages and limitations of the currently available morphological, morphometrical and molecular biology based approaches that may be utilized for characterization of these important structures. It has become apparent that no single methodology is sufficient to fully characterize these structures and the majority of researchers favor the use of combinational or polyphasic approaches.

scholarly journals Characterization of retorted shale for use in heavy metal removal

2010 ◽  
Vol 48 (3) ◽  
pp. 375-378 ◽  
Author(s):  
P.M. Pimentel ◽  
R.M.P.B. Oliveira ◽  
D.M.A. Melo ◽  
M.J. Anjos ◽  
M.A.F. Melo ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal

scholarly journals The Calibration Home Base for Imaging Spectrometers

2016 ◽  
Vol 2 ◽  
Author(s):  
Johannes Felix Simon Brachmann ◽  
Andreas Baumgartner ◽  
Peter Gege
Keyword(s):  
Wavelength Range ◽  
Stray Light ◽  
Third Party ◽  
Home Base ◽  
Geometric Calibration ◽  
Wide Range ◽  
Along Track ◽  
Near Future

The Calibration Home Base (CHB) is an optical laboratory designed for the calibration of imaging spectrometers for the VNIR/SWIR wavelength range. Radiometric, spectral and geometric calibration as well as the characterization of sensor signal dependency on polarization are realized in a precise and highly automated fashion. This allows to carry out a wide range of time consuming measurements in an ecient way. The implementation of ISO 9001 standards in all procedures ensures a traceable quality of results. Spectral measurements in the wavelength range 380–1000 nm are performed to a wavelength uncertainty of +- 0.1 nm, while an uncertainty of +-0.2 nm is reached in the wavelength range 1000 – 2500 nm. Geometric measurements are performed at increments of 1.7 µrad across track and 7.6 µrad along track. Radiometric measurements reach an absolute uncertainty of +-3% (k=1). Sensor artifacts, such as caused by stray light will be characterizable and correctable in the near future. For now, the CHB is suitable for the characterization of pushbroom sensors, spectrometers and cameras. However, it is planned to extend the CHBs capabilities in the near future such that snapshot hyperspectral imagers can be characterized as well. The calibration services of the CHB are open to third party customers from research institutes as well as industry.

Let the Games Begin

2016 ◽  
Author(s):  
Emily L. Hiltz
Keyword(s):  
Natural Order ◽  
The Political ◽  
Hunger Games ◽  
Political Commentary ◽  
The Hunger Games ◽  
External Forces ◽  
Good And Evil ◽  
The Relationship ◽  
The City

This essay examines Suzanne Collins’s monstrous “mutts” in her phenomenally popular series The Hunger Games. Hiltz is especially interested in Collins’s characterization of human-animal hybrids, investigating the relationship between the political commentary at work in the novels and these “monsters,” from the half-wolf, half-humans that nearly overtake Katniss at the Cornucopia in the first novel to the lizard-humans whispering her name throughout the viaducts beneath the city in the last. Hiltz focuses on the mutts as abject creatures, demonstrating the ways in which these uncanny monsters, quite literally making the familiar strange, are at once metaphors for the political control exerted by the Capitol, the rebels’ resistance to the Capitol’s power, and the disruption of natural order. She also concentrates on Katniss and Peeta muttations, each of them reformed by warring entities in service of “the greater good.” Most importantly, Hiltz emphasizes that Collins’s mutts are designed to demonstrate the fine and wavering line between good and evil, calling into question the nature of monstrosity, especially as it relates to human behavior. Her location of monstrosity in the protagonists themselves especially offers a new way of thinking about teen dystopic novels that engage horror as a means of conveying identities assaulted by external forces.

Energy Harvesting Aspects of Irregular Vibrating Forces Acting on Piezoelectric Devices

2015 ◽  
pp. 143-158
Author(s):  
Alessandro Massaro
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Materials ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Output Current ◽  
Vibrating System ◽  
External Forces ◽  
Piezoelectric Devices ◽  
Three Dimensional Space

After a brief introduction of piezoelectric materials, this chapter focuses on the characterization of vibrating freestanding piezoelectric AlN devices forced by different external forces acting simultaneously. The analyzed vibrating forces are applied mainly to piezoelectric freestanding structures stimulated by irregular vibration phenomena. Particular kinds of theoretical noise signals are commented. The goal of the chapter is to analyze the effect of the noise in order to model the chaotic vibrating system and to predict the output current signals. Moreover, the author also shows a possible alternative way to detect different vibrating force directions in the three dimensional space by means of curved piezoelectric layouts.

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