33 research outputs found
Vibration modes and acoustic noise in a four-phase switched reluctance motor
No full textAcoustic noise in the switched reluctance motor (SRM) is caused primarily by the deformation of the stator lamination stack. Acoustic noise is most severe when the periodic excitation of the SRM phases excites a natural vibration mode of the stack. The natural vibration modes and frequencies of a four-phase, 8/6 SRM are examined. Structural finite element analysis is used to compute the natural modes and frequencies. Impulse tests on the stator stack verify the calculations and show which modes are excited. Heuristic arguments are developed to predict the operating conditions that will excite the natural modes. Measurement of vibration while the machine is under load shows which operating conditions excite the natural modes and verifies the predictions. An approximate formula is derived to predict the frequency of the fundamental vibration mode in terms of lamination dimensions and material properties. The formula is validated by comparison with finite element calculations for several laminations, and hence is shown to be useful in design trade-off studies
A literature review of the Treatment and Education for Autistic and Related Communication Handicapped Children (TEACCH) Program
No full textPlan BAutism is a complex disorder that affects a child’s social skills, communication skills and restricts a child’s activities and interests (American Psychiatric Association, 2000). Since Kanner first identified autism in 1943 (Gresham et al., 1999), several theories regarding causes, treatments, and research directions have been introduced. One of the treatment programs developed to assist children with autism is the Treatment and Education of Autistic and Communication handicapped Children (TEACCH) program. Three important aspects TEACCH are early diagnosis and assessment, parental collaboration, and structured teaching. The current investigation reviews the history and characteristics of autism, development of the TEACCH program, relevant literature in the above-mentioned aspects of the program, and suggests future research directions regarding TEACCH
Taxonomy, phylogeny and eco-biogeography of southern African white-eyes (Zosterops spp.) Aves: order Passeriformes, Family: Zosteropidae
No full textIncludes abstract.Includes bibliographical references (p. 193-216).The aim of this study was to incorporate all lines of evidence to establish the true taxonomy and phylogeny of southern African Zosterops. Character data sets used include plumage and morphometric measures, vocal characters and molecular (mitochondrial and nuclear) DNA sequences. A broad scale phylogeographic analysis was also performed to establish the evolutionary process driving the diversity observed among these birds
Gas chromatographic estimation of vapor pressures and octanol-air partition coefficients of semivolatile organic compounds of emerging concern
No full textThe subcooled liquid-phase vapor pressures (pL298/Pa) and octanol–air partition coefficients (KOA298) at T/K = 298, enthalpies of vaporization (ΔVAPH/kJ·mol–1), and internal energies of phase transfer from octanol to air (ΔOAU/kJ·mol–1) were estimated for synthetic musks, novel brominated flame retardants (N-BFR), organophosphate esters, and ultraviolet filters using the capillary gas chromatographic retention time (GC-RT) method. These compounds, which spanned approximately six and three orders of magnitude for pL298/Pa and KOA298, respectively, were co-chromatographed with one of three reference compounds to give initial estimates of properties at T/K = 298. The initial GC-RT property estimates were subsequently calibrated using 18 compounds that spanned 6 log units for pL298/Pa and 13 compounds covering 4 log units for KOA298. The calibrated log10pL298/Pa values estimated here ranged from 0.14 ± 0.19 to −9.19 ± 0.29 for cyclopentadecanone to syn-dechlorane plus (syn-DDC-CO), respectively, while the range of log10KOA298 values was 6.59 ± 0.26 to 11.40 ± 0.23 for cyclopentadecanone to 2,2′,4,4′,5-pentabromodiphenyl ether (BDE-99), respectively. The calibrated GC-RT-derived values were highly correlated with, and were within an average of 0.70 log units of, the literature data for compounds with well-established pL298/Pa and KOA298 measured or derived using non-GC-RT methods. Nonpolar compounds were used in this study to estimate the target polar compound data, which may introduce systematic errors. However, the comparison of our GC-RT results against the literature non-GC-RT values shows that the GC-RT methods performed similarly well for estimating both polar and nonpolar target compounds studied in this work.ecochang
Silence and the crisis of self - legitimation in English romanticism
No full textMy thesis depicts the crisis of self-legitimation that has accompanied the onset of modern hermeneutics, with its historicised and organicised version of the Enlightenment's 'universal perspective.' In this it follows the lead of the contemporary hermeneuticist Hans- Georg Gadamer in resuscitating the notion of prejudice, but contrasts it with Hannah Arendt's discussion of the human condition. She implicitly locates the problem in modern hermeneutics, the aporia, in the very philosophy of life that Gadamer embraces as its solution. Gadamer confuses the task of the humanities as a search for truth with what it ought to be, a search for meaning. I begin with his depiction of Kant's attack on the sensus communis; I conclude with an examination of the consequences of this attack on the orientation and interpretative practices of current schools of literary criticism with specific reference to Keats's Ode on a Grecian Urn. In the central chapter, I focus upon Coleridge's attack on Wordsworth's Preface to Lyrical Ballads (1802) in the Bioeraphia Literaria, reading it as a fundamental defence of prejudice based on the very fact that man has been made in imago Dei. The consequent logocentricity of humanity that Coleridge insists upon opposes Wordsworth's emphasis upon a transcendental idea of 'feeling.' This fundamental notion forms the basis of Coleridge's definition of the primary imagination. I argue the distinctiveness of his definition from that of the other Romantics and maintain its necessity to escape the aporia. This point is proved negatively by Shelley's Mont Blanc, which seizes upon the radical consequences of Wordsworth's poetics, presenting both heresy and obscurity in the poem. The word 'crisis' thus reflects the urgency with which I advocate the need to re-adopt Coleridge's emphases in contemporary literary criticism
How Gambians save and what their strategies imply for international aid
No full textInterventions in this small impoverished West African nation have been based mainly on credit ( debt ). Public and private lending institutions have failed dramatically, with the resultant mounting debts. Yet, lenders continue extending loans into the countryside. The author suggests that there is room for new options. One of these is for financial intermediaries to subsidize savings rather than credit. The author looks at length at the question : How do Gambians save? Saving takes many forms other than money, including livestock, jewelry, store crops, and resaleable household goods. Gambians do not prefer liquidity. They often convert wealth into forms that shelter it from the daily demands of spouses, kin, neighbors, and from their own temptation. Gambian farmers choosing saving options weigh trustworthiness and convenience more heavily than real or nominal interest rates or inflationary losses. The author concludes that the Gambians need a balance between credit and saving, liquidity and illiquidity, individualism and group responsibility.Agricultural Research,Economic Theory&Research,Banks&Banking Reform,Environmental Economics&Policies,Agricultural Knowledge&Information Systems
The role of the international patent system in the transfer of technology to West Africa : case studies : Ghana and Nigeria
No full textThe principal aim of this thesis is to undertake a critical
examination of the role of the international patent system in the
transfer of technology to West Africa, particularly Ghana and Nigeria.
It focuses mainly on the patent systans and technology regulatory
regimes of the two countries. The study is intended to identify and
evaluate the impact of the international patent system on the transfer
and development of technology in this area.
The first chapter provides a theoretical foundation to some of
the more practical issues to be discussed in the subsequent chapters.
The Paris Convention and the diplomatic revision exercise thereof, as
well as other efforts and policies regarding patents and technology
transfer at various levels are discussed in Chapter Two. Chapters
Three to Eight consider the two case-studies undertaken in this
thesis. Chapter Three begins with the historical development of the
patent system in both Ghana and Nigeria, and the remaining chapters
continue with a discussion of the present patent and technology
regulatory regimes of both countries. Based on facts and figures the
two case-studies examine critically the patent law and systems and
technology transfer laws of these two countries including other
related institutional measures highlighting their strengths and
weaknesses.
The study argues that if the patent systems of both countries
are to play a meaningful role in the transfer and developnent of
technology they nust be utilized as a tool of economic policy and also
be related to the technology transfer regimes which nust necessarily
be integrated into the national technology policy which should, in
turn, be made an integral part of the entire national developnent
plan. It is concluded that it is only in this way that the patent
system can effectively contribute to the transfer of technology and
the development of indigenous technological capabilities in the two countries
Novel Bayesian Method to Derive Final Adjusted Values of Physicochemical Properties : Application to 74 Compounds
No full textAccurate values of physicochemical properties are essential for screening semivolatile organic compounds for human and environmental hazard and risk. In silico approaches for estimation are widely used, but the accuracy of these and measured values can be difficult to ascertain. Final adjusted values (FAVs) harmonize literature-reported measurements to ensure consistency and minimize uncertainty. We propose a workflow, including a novel Bayesian approach, for estimating FAVs that combines measurements using direct and indirect methods and in silico values. The workflow was applied to 74 compounds across nine classes to generate recommended FAVs (FAVRs). Estimates generated by in silico methods (OPERA, COSMOtherm, EPI Suite, SPARC, and polyparameter linear free energy relationships (pp-LFER) models) differed by orders of magnitude for some properties and compounds and performed systematically worse for larger, more polar compounds. COSMOtherm and OPERA generally performed well with low bias although no single in silico method performed best across all compound classes and properties. Indirect measurement methods produced highly accurate and precise estimates compared with direct measurement methods. Our Bayesian method harmonized measured and in silico estimated physicochemical properties without introducing observable biases. We thus recommend use of the FAVRs presented here and that the proposed Bayesian workflow be used to generate FAVRs for SVOCs beyond those in this study.</p
The ascension, pleroma and ecclesia concepts in Ephesians
No full textThe basic aim of the study is to investigate
the relationship between a number of christological
and ecclesiological themes. The first section of the
essay is concerned with the identification of the
traditions employed by the author in his presentation
of an ascension theology in 1:20-23 and 4:8-10.
Having once established these traditions, an attempt
is made to trace a Traditiongeschichte for them.
The second part of the essay is concerned with the
relationship between the ascension theology and the
kephale and pleroma motifs which are present in both
pericopes. This investigation necessitates an
examination of the Pauline theology. At the same
time within this section an attempt is made to trace
the source of the pleroma terminology as used by the
author of the epistle. In the third section of the
essay the interest is more general; an attempt is
made to discover how the "component parts" of the
author's ascension theology are used elsewhere in the
epistle. In the fourth and last section of the essay
the interest is again with traditions, specifically
the use made of the traditions inherent in the
ascension pericopes in the epistle in the writings
of both the Church Fathers and of authors outside
the main stream of Christian thought
