Gain measurements of standard electromagnetic horns in the kappa and kappa alpha bands

Gain measurements of standard electromagnetic horn antennas for use in calibrating millimeter wave, parabolic radio telescope

Addressing car dependency in Cape Town: Reviewing how the Citys mobility and spatial frameworks can transcend car-oriented urbanism

This dissertation presents research conducted by Wrixon Mpanang'ombe titled ‘Addressing car dependency in Cape Town: Reviewing how the city's mobility and spatial frameworks can transcend car-oriented urbanism'. The research stems from a background of the need to address problems associated with the dominance of cars in cities. The problems include carbon emissions contributing to climate change, road safety issues, pollution and other public health challenges, but also inequitable accessibility favouring private car users, among many other problems. Also, the research is motivated by and in response to the argument by Newman and Kenworthy (2015) that cities are experiencing an end to car dependency. However, since this argument is made based on Global North contexts, researching what an end to car dependency might imply for Southern cities is very relevant. Therefore, this research situates in Cape Town to explore how the City of Cape Town is currently dealing with the issue of transitioning away from car dependency and caroriented urbanism. The research explores this by deploying an analysis of the discourse around issues addressing car dependency and car-oriented urbanism in the City's key transport and spatial planning frameworks. The frameworks were analysed through a series of assessment criteria that were derived from the literature review. Three main gaps emerged through the research: (1) the reluctance to call out car dependency as a major transport problem in the city, (2) the focus on costs for low-income groups in the City's transport planning objectives while overlooking the car dependency in medium- and high-income groups, and (3) the inadequate spatial alignment of plans with the varying urban fabrics (i.e., based on Newman's and Kenworthy's (2015) theory of urban fabrics) and therefore not positioned to leverage the potential of rejuvenating urban fabrics as a pathway toward ending car dependency. The research further suggests that to address these gaps, the key frameworks should be repositioned to explicitly name car dependency as a major problem for the urban mobility system, but also the various urban fabrics should be mapped and aligned with the City's transport and spatial plans and land use policies

Cyberstalking: the role of sex in perpetrator behaviour and victim impact

A thesis submitted to the University of Bedfordshire in partial fulfilment of the requirements for the degree of Master of Science by ResearchResearch has previously found a higher than expected percentage of male victims in cases of cyberstalking. Furthermore, it has been shown that female cyberstalking victims primarily fear physical harm and male victims primarily fear loss of reputation. This study considers why these differences exist with particular focus on the online behaviour of men and women. Using two questionnaires this study examines the behaviour of Internet users and the experiences of cyberstalking victims in order to consider whether there is a relationship between the way men and women use technology and the fears they experience if cyberstalked. It was found that men and women spend equal amounts of time online and that men do not place any more emphasis on their online professional presence than women. However, differences were found between the sexes in regards to some online anti-social behaviours and these findings did relate to the differing behaviours of male and female cyberstalking perpetrators. This study concludes that the differences between primary fears in cyberstalking victims are influenced by the online behaviour of the perpetrator and how individuals use the Internet. However these factors cannot be attributed as the sole reason for differences in cyberstalking fears in men and women

Write from the Heart: An Interview with Brian Wrixon, a Poet from Canada

Brian Wrixon, a poet, was born in 1946 in Toronto, Canada. He graduated from Laurentian University in Canada with a degree in Classical Studies, and is a former faculty member, online curriculum design consultant and program coordinator at Mohawk College in Hamilton, Ontario. His working career in the financial services business spanned forty years. He has contributed his poems to numerous collections of poetry. Apart from this, as a poet, he has written Poetry in Motion Volumes 1 & 2 (2011), Confessions of a Would-Be Poet (2011), Heartbeats, Footsteps & Musings (2012), Doors (2013), Down to the Sea in Words (2013), The Moving Finger Writes (2013), Sculptured Words (2013), A tisket, a tasket, poems in a Basket (2013), It’s a Sign of the Times (2013), Nightmares & Dreams (with Rollie Mukherjee) (2013),Shoot From the Hip: Memories of a Small Town (2013), A Return Ticket: Memories of Leaving a Small Town (2013), My Passage to India (2014), A Look at Yesterday (with Robert Vincent) (2014), Our Town Revisited (with Robert Vincent) (2014) and Desperate Freedom: a Play in Four Acts (2014). Apart from composing a good number of poems, he has edited many anthologies of poems and operates as a publisher as well. In addition to writing and publishing numerous poetry and prose works of his own, he has been instrumental in assisting hundreds of young and emerging authors from around the world get published, either personally or as contributors to group anthologies

A rigorous exposition of the LEMMA method for analog and mixed-signal testing.

The linear error-mechanism modeling technique is an effective tool for testing analog and mixed-signal devices which minimizes the number of measurements required to characterize the static transfer function of a circuit by determining a small number of parameters of a linear error model and then predicting the entire response error. This work focuses on optimizing the linear error-mechanism model algorithm (LEMMA), introducing novel refinements which are shown to improve its performance significantly. We outline the implementation of the algorithm in a tutorial manner, paying due consideration to the underlying theory where required

Reactivity of 1,2,5,6-Tetrathiocines

This thesis describes selected chemistry of 1,2,5,6-tetrathiocines, 8-membered heterocycles containing four S atoms which can be considered as bis(disulfides). Chapter 1 provides a literature review of the existing chemistry of 1,2,5,6-tetrathiocines. Chapters 2 – 4 examine the oxidative addition chemistry of tetrathiocines to zero-valent group 10 metal complexes in the presence of an auxiliary phosphine ligand under microwave conditions to afford nickel, palladium and platinum dithiolate complexes. These chapters probe the effect of the metal (Chapter 2), the auxiliary phosphine (Chapter 3) and the tetrathiocine (Chapter 4) on the outcome of the chemical reaction, leading to a range of mono-, di- and hexa-metallic complexes which have been fully characterized by multinuclear NMR, mass spectroscopy and X-ray diffraction. Finally, Chapter 6 describes the use of tetrathiocines as precursors to 1,3,2-benzodithiazyl (BDTA) radicals and two new dithiazolyl radicals have been isolated and characterized by X-ray diffraction and EPR spectroscopy

Soil radium, soil gas radon and indoor radon empirical relationships to assist in post-closure impact assessment related to near-surface radioactive waste disposal

Least squares (LS), Theil’s (TS) and weighted total least squares (WTLS) regression analysis methods are used to develop empirical relationships between radium in the ground, radon in soil and radon in dwellings to assist in the post-closure assessment of indoor radon related to near-surface radioactive waste disposal at the Low Level Waste Repository in England. The data sets used are (i) estimated 226Ra in the <2 mm fraction of topsoils (eRa226) derived from equivalent uranium (eU) from airborne gamma spectrometry data, (ii) eRa226 derived from measurements of uranium in soil geochemical samples, (iii) soil gas radon and (iv) indoor radon data. For models comparing indoor radon and (i) eRa226 derived from airborne eU data and (ii) soil gas radon data, some of the geological groupings have significant slopes. For these groupings there is reasonable agreement in slope and intercept between the three regression analysis methods (LS, TS and WTLS). Relationships between radon in dwellings and radium in the ground or radon in soil differ depending on the characteristics of the underlying geological units, with more permeable units having steeper slopes and higher indoor radon concentrations for a given radium or soil gas radon concentration in the ground. The regression models comparing indoor radon with soil gas radon have intercepts close to 5 Bq m−3 whilst the intercepts for those comparing indoor radon with eRa226 from airborne eU vary from about 20 Bq m−3 for a moderately permeable geological unit to about 40 Bq m−3 for highly permeable limestone, implying unrealistically high contributions to indoor radon from sources other than the ground. An intercept value of 5 Bq m−3 is assumed as an appropriate mean value for the UK for sources of indoor radon other than radon from the ground, based on examination of UK data. Comparison with published data used to derive an average indoor radon: soil 226Ra ratio shows that whereas the published data are generally clustered with no obvious correlation, the data from this study have substantially different relationships depending largely on the permeability of the underlying geology. Models for the relatively impermeable geological units plot parallel to the average indoor radon: soil 226Ra model but with lower indoor radon: soil 226Ra ratios, whilst the models for the permeable geological units plot parallel to the average indoor radon: soil 226Ra model but with higher than average indoor radon: soil 226Ra ratios