155 research outputs found
The identity of inbetweenship : An post-colonial analysis of Navid Modiris authorship
No full textThe purpose of this essay is to examine how Navid Moodiris concept of "mellanförskap", translated by the author himself as "inbetweenship", the postcolonial we and them as well as different identity constructions are expressed in social debator Navid Modiris authorship. The notion of identity is used from a social psychological perspective and the notion of inbetweenship is based on Modiris own description of the term. The theoretical starting point for the study is the post-colonial theory with focus on Said's construction of "the Other" and Spivak and Halls thoughts on how colonialism influenced and influence today's society. The questions at issue are examined by analysis of three poems from the poem vollection Skrik om du brinner (eng. Cry if you are on fire) and two lyrics. Analysis results are presented through quotes from the texts, which are discussed and commented on the basis of how inbetweenship, we and them as well as different identities are expressed in the texts. Overall, it is mainly through themes such as family relationships, distance, generalizations and lack of limits that the investigated objects are highlighted. The clear conclusion is that it's because of the normative society that we and them, and the feeling of inbetweenship can be produced and that the criticism of this society is the underlying theme of the Modiris entire authorship.Syftet med uppsatsen är att undersöka hur mellanförskap, det postkoloniala vi och dem samt olika identitetskonstruktioner kommer till uttryck i samhällsdebattören Navid Modiris författarskap. Begreppet identitet används utifrån ett socialpsykologiskt perspektiv och mellanförskap utifrån Modiris egen beskrivning av termen. Den teoretiska utgångspunkten för studien är den postkoloniala teorin med fokus på Saids konstruktion av "de Andra" samt Spivak och Halls tankar om hur kolonialismen påverkat och påverkar dagens samhälle. Studiens frågeställningar undersöks genom analys av tre dikter från diktsamlingen Skrik om du brinner samt två låttexter. Analysresultatet presenteras genom citat från texterna, vilka diskuteras och kommenteras utifrån hur mellanförskap, vi och dem samt olika identiteter kommer till uttryck i texterna. Sammantaget är det främst genom teman som släktskap, avstånd, generaliseringar och avsaknaden av gränser som de undersökta objekten lyfts fram. Den tydliga slutsatsen är att det är på grund av det normativa samhället som vi och dem samt känslan av ett mellanförskap kan skapas samt att det är kritiken mot detta samhället som är det underliggande temat för hela Modiris författarskap
Diffractive electron mirror for use in quantum electron microscopy
No full textThesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections."February 2018." Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 66-70).Periodic atomic structures in thin crystals and artificially fabricated periodic structures in transmission gratings have long been used to coherently split electrons by means of electron diffraction for applications such as interferometry, holography and imaging. Due to their reliance on transmission through matter, however, these methods are prone to electron scattering and absorption and are therefore lossy to some extent. This loss becomes a major issue for quantum electron microscopy (QEM), an interaction-free measurement scheme with electrons as probe particles. QEM relies on single electrons completing many round trips inside an electron resonant cavity, splitting and re-coupling during each round trip, effectively multiplying the probability of loss by the number of round trips. Thus, in one of the designs for QEM, the use of reflective diffraction gratings as lossless electron beam splitters is proposed. In this thesis, diffractive electron mirrors were fabricated by integrating one-dimensional diffraction gratings with tetrode electron mirrors. Optical interference lithography was used to fabricated silicon diffraction gratings with pitches varying from 200 nm to 500 nm. Furthermore, a proof-of-principle experiment to demonstrate their function as electron mirrors inside a scanning electron microscope was developed. It was demonstrated that the constructed tetrode electron mirrors satisfied the requirements of QEM for electron energies up to 3 keV. Finally, in a similar experiment, the fabricated diffractive electron mirrors were tested to demonstrate their function as lossless beam splitters. Preliminary results point to the evidence for electron diffraction, suggesting that diffractive electron mirrors could be used as as lossless electron beam splitters for QEM and other applications.by Navid Abedzadeh.S.M
Management Production Systems and Timing Strategies for Cull Cows
No full textReplaced with revised version of paper 06/04/09.Cattle, cull cows, management, marketing, production systems, timing, Farm Management, Marketing,
hennylab/Neuronal-Convex-hull-intersection: Neuronal-Convex-hull-intersection
No full textRaw data, MATLAB scripts and data analysis from:
Geometrical factors determining dendritic domain intersection between neurons: a modeling study
Rafael Ignacio Gatica1, Trinidad Montero1, Navid Farassat2 and Pablo Henny1
1Laboratorio de Neuroanatomía, Departamento de Anatomía, and Centro Interdisciplinario de Neurociencia, NeuroUC, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
2Institute for Neurophysiology, Goethe University, Frankfurt, Germany
*Corresponding author:
E-mail: [email protected]
Finding effective parameters for mitigating traffic congestion near universities
No full textThis paper intends to assess the effect of different parameters on traffic congestion around universities. On the basis of the model outputs, it is possible to propose economic countermeasures for reducing traffic congestion, especially in developing countries. Structural equation modelling was used to assess the relevance between characteristics of students, features of different modes, environmental conditions and daily demand variations with traffic congestion. The Shahid Bahonar University of Kerman in Iran was considered as a case study. The results showed that it is necessary to decrease the demand first. For this purpose, rescheduling courses is essential to distribute classes more effectively within a week. Virtual classes can be used more frequently as a substitute for traditional on-campus courses. The probability of using buses should be increased by reducing waiting time and fares, and promoting their safety. Similarly, taxi use can be increased by improving safety and waiting time. To reduce the likelihood of using private cars, pricing strategies must establish more limitations for using university carparks.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Pavement Engineerin
Three-dimensional CFD-DEM simulation of raceway transport phenomena in a blast furnace
No full textpeer reviewedImproving energy efficiency in a blast furnace (BF) has a significant effect on energy consumption and pollutant emission in a steel plant. In the BF, the blast injection creates a cavity, the so-called raceway, near the inlet. On the periphery of the raceway, a ring-type zone is formed which is associated with the highest coke combustion rate and temperatures in the raceway. Therefore, predicting the raceway size or in other words, the periphery of the ring-type zone with accuracy is important for estimating the BF’s energy and coke consumption. In the present study, Computational Fluid Dynamics (CFD) is coupled to Discrete Element Method (DEM) to develop a three-dimensional (3D) model featuring a gas–solid reacting flow, to study the transport phenomena inside the raceway. The model is compared to a previously developed two-dimensional (2D) model and it is shown that the assumptions associated with a 2D model, result in an overestimation of the size of the raceway. The 3D model is then used to investigate the coke particles’ combustion and heat generation and distribution in the raceway. It is shown that a higher blast flow rate is associated with a higher reaction rate and a larger raceway. A 10% increase in the inlet velocity (from 200 m/s to 220 m/s) caused the raceway volume to grow by almost 40%. The DEM model considers a radial discretization over the particle, therefore the heat and mass distributions over the particle are analyzed as well.Raceway of Blast Furnac
Elevated temperatures in waste containment facilities
No full textMunicipal solid waste (MSW), construction demolition debris (CDD), industrial byproducts, and many other wastes are landfilled in waste containment facilities. A number of factors can lead to elevated temperatures and thus present a hazard to the public health and safety. For instance, MSW landfills can produce obnoxious odors, toxic gases, and aggressive leachates. In addition, they can damage gas extraction, leachate collection, interim cover, and composite liner systems. These events can result in expensive remediation and warrant the permanent closure of the facility.
The main objectives of this research are to: (1) identify causes and frequency of elevated temperatures; (2) develop a reactivity test for hazardous classification of aluminum production waste (APW); (3) develop an experiment to characterize gas generation and composition of APW; (4) identify progression of indicators for elevated temperatures in MSW landfills; (5) propose a classification system for landfill operators to assess the location and movement of elevated temperatures; and (6) evaluate the impact of elevated temperatures to high density polyethylene (HDPE) geomembrane service life.
MSW landfills with a gas collection and control system used to comply with federal regulations (40 CFR, Part 60, Subpart WWW) operate each gas extraction well with a landfill gas temperature less than 55°C (131°F) because methane production from mesophilic bacteria starts to significantly decrease if the temperature of the waste mass exceeds 55°C (Kasali and Senior 1989; Hartz et al. 1982). At temperatures beyond 64°C, Ahring et al. (1995) report that thermophilic methanogens are inhibited and methane production slows or ceases. Therefore, in this thesis waste temperatures above 65°C is considered to be elevated because anaerobic decomposition has been curtailed. Several factors can lead to elevated landfill temperatures, including aerobic decomposition, self-heating, partially extinguished surface fires, exothermic chemical reactions, and spontaneous combustion. Although the leading mechanism of elevated temperatures is air ingress, landfills are also experiencing elevated temperatures due to exothermic reactions from APW. Because aluminum production waste does not meet hazardous waste classification criteria, they are commonly disposed in MSW landfills. As a result, a novel bench-scale calorimeter is developed and calibrated to measure potential temperature escalation. The calorimeter experiments at varying sodium hydroxide (NaOH) strengths show temperatures can rise to 100°C. For a landfill operator, the optimal concentration of NaOH was determined to be 1 M to 2 M NaOH because it provides sufficient alkalinity to react the metallic aluminum and fulfill the objectives of a rapid procedure to evaluate the reactivity criterion for hazardous waste classification. A gas generation test is developed and calibrated to evaluate hydrogen production and ammonia emissions from this waste stream. In addition, guidelines are provided for the disposal of APW in waste containment facilities.
Whether aluminum wastes, air ingress, or other mechanisms lead to elevated temperatures, these events start in a localized area and over time can expand and consume entire landfill facilities. A case study is used to consolidate changes in landfill behavior into an ordered sequence (referred herein as progression of indicators) to permit landfill operators and first responders to detect and identify the location of elevated temperatures. Expanding on the progression of indicators, two case histories are used to develop methods to illustrate spatial and temporal changes in landfill behavior. In particular, the first case study illustrates spatial movements with gas wellhead temperature, ratio of methane to carbon dioxide, and settlement, while the second case study demonstrates subsurface temperature migration. These two case studies along with the progression of indicators are used to classify MSW landfills into five zones: anaerobic biodegradation, gas front, heating front, smoldering front, and combustion/pyrolysis zone.
In addition, elevated temperatures can negatively impact engineered components in composite bottom liners, cover systems, leachate collection, and gas extraction and recovery systems. A case study is used to investigate the effect of elevated temperatures on HDPE geomembrane service life. When peak temperatures reach 60°C to 80°C, the geomembrane service life can be reduced to decades for the conditions examined and thus raises concerns regarding the integrity of the geomembrane at high temperatures.Submission published under a 24 month embargo labeled 'U of I only', the embargo will last until 2017-08-01The student, Navid Jafari, accepted the attached license on 2015-07-02 at 10:44.The student, Navid Jafari, submitted this Dissertation for approval on 2015-07-02 at 11:50.This Dissertation was approved for publication on 2015-07-08 at 14:51.DSpace SAF Submission Ingestion Package generated from Vireo submission #8332 on 2015-09-29 at 14:59:07Made available in DSpace on 2015-09-29T20:49:42Z (GMT). No. of bitstreams: 2
JAFARI-DISSERTATION-2015.pdf: 13269600 bytes, checksum: b0267752b87f266e032db3709ad41265 (MD5)
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Previous issue date: 2015-07-08Embargo set by: Seth Robbins for item 89438
Lift date: 2017-09-29T20:50:34Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 89438 on 2017-09-30T09:15:35Z
Development and Evaluation of Image Reconstruction Algorithms for a Novel Desktop SPECT System
No full textObjective (s): Various iterative reconstruction algorithms in nuclear medicine have been introduced in the last three decades. For each new imaging system, it is wise to select appropriate image reconstruction algorithms and evaluate their performance. In this study, three approaches of image reconstruction were developed for a novel desktop open-gantry SPECT system, PERSPECT, to assess their performance in terms of the quality of the resultant reconstructed images.Methods: In the present work, a proposed image reconstruction algorithm for the PERSPECT, referred to as quasi-simultaneous multiplicative algebraic reconstruction technique (qSMART), together with two popular image reconstruction methods, maximum-likelihood expectation-maximization (MLEM) and ordered-subsets EM (OSEM), were implemented and compared. Analytic and Monte Carlo simulations were applied for data acquisition of various phantoms including a micro-Derenzo phantom. All acquired data were reconstructed by the three algorithms using different number of iterations (1-40). A thorough set of figures-of-merit was utilized to quantitatively compare the generated images.Results: OSEM depicted reconstructed images of higher (or matching) quality in comparison to qSMART. MLEM also reached nearly similar quality as OSEM but at higher number of iterations. The graph of data discrepancy revealed that the ranking of the three approaches in terms of convergence speed is as qSMART, OSEM, and MLEM. Furthermore, bias-versus-noise curves indicated that optimal bias-noise results were achieved using OSEM.Conclusion: The results showed that although qSMART can be applied for image reconstruction if being halted in the early iterations (up to 5), the best achievable quality of images is obtained using the OSEM
An Adjoint Approach to Error Estimation for Mimetic Spectral Element Method
No full textAerospace Engineering | Aerodynamics and Wind Energ
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