Relevant bibliographies by topics / Centre variation

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Centre variation'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Centre variation"

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Kuenzig, E., H. Singh, A. Bitton, G. G. Kaplan, M. W. Carroll, A. Otley, T. A. Stukel, et al. "A65 VARIATION IN THE CARE OF CHILDREN WITH INFLAMMATORY BOWEL DISEASE: A CANGIEC POPULATION-BASED STUDY." Journal of the Canadian Association of Gastroenterology 3, Supplement_1 (February 2020): 78–79. http://dx.doi.org/10.1093/jcag/gwz047.064.

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Abstract Background Inflammatory bowel disease (IBD) is rising rapidly in Canadian children. These children require consistent high-quality specialized care to prevent long-term complications. Aims Evaluate variation in health services utilization and surgery rates across pediatric IBD centres in Ontario. Methods Incident cases of IBD <16y (1999–2010), identified from health administrative data using a validated algorithm, were assigned to pediatric IBD centres based on location of IBD hospitalization, endoscopy and outpatient care. Children receiving IBD-specific care outside pediatric centres were also grouped. Frailty models, median hazard ratios (MHR), and Kendall’s t described variation in IBD-related ED visits, hospitalizations, and surgery 6–60 months after diagnosis, adjusting for age, sex, rural/urban household, and income. Mean diagnostic lag (time from first health system contact for an IBD symptom to final IBD diagnosis) and proportion of children with IBD care by gastroenterologists (GIs) at each centre were evaluated as centre-level predictors of variation. Results Of 2584 IBD cases, 73.4% were treated in a pediatric IBD centre. Between-centre differences accounted for 0.18% (MHR 1.06) and 0.41% (MHR 1.09) of variation in hospitalizations and ED visits, respectively. Children treated at centres where a higher proportion of children were cared for by GIs were more likely to be hospitalized (HR 2.09, 95% CI 1.26–3.45). Children treated at centres with a longer mean diagnostic lag were also more likely to be hospitalized (HR 1.01, 95% CI 1.003–1.02). ED visits were not associated with the proportion of children cared for by gastroenterologists or diagnostic lag. Among 1529 CD cases, 14.1% required intestinal resection; 1.79% of variation in the risk of surgery resulted from between-centre differences (MHR 1.20). Surgery was less common among patients at centres where more children were cared for by GIs (HR 0.24, 95% CI 0.07–0.84) and with a longer mean diagnostic lag (HR 0.98, 95% CI 0.97–0.99). After adjusting for these, between-centre differences accounted for 0.005% (MHR 1.01) of variation in care. Minimal variation was observed among the 11.0% of 872 UC cases requiring colectomy, with 0.37% of variation due to between-centre differences (MOR 1.09). Colectomy risk was not associated with GI care or diagnostic lag. Conclusions Variation in ED visits, hospitalizations, and surgery among children with IBD is small; however, centre-level differences in GI specialist care use and time to diagnosis were associated with hospitalization and surgery. It is essential to understand between-centre differences to reduce variation and ensure high-quality care. Funding Agencies CCC
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Hawkins, Janine, Nigel Smeeton, Amanda Busby, David Wellsted, Beth Rider, Julia Jones, Retha Steenkamp, et al. "Contributions of treatment centre and patient characteristics to patient-reported experience of haemodialysis: a national cross-sectional study." BMJ Open 11, no. 4 (April 2021): e044984. http://dx.doi.org/10.1136/bmjopen-2020-044984.

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ObjectivesTo examine the relative importance of patient and centre level factors in determining self-reported experience of care in patients with advanced kidney disease treated by maintenance haemodialysis (HD).DesignAnalysis of data from a cross sectional national survey; the UK Renal Registry (UKRR) national Kidney patient-reported experience measure (PREM) survey (2018). Centre-level data were obtained from the UKRR report (2018).SettingNational survey of patients with advanced kidney disease receiving treatment with maintenance HD in UK renal centres in 2018.ParticipantsThe Kidney PREM was distributed to all UK renal centres by the UKRR in May 2018. Each centre invited patients receiving outpatient treatment for kidney disease to complete the PREM. These included patients with chronic kidney disease, those receiving dialysis—both HD and peritoneal dialysis, and those with a functioning kidney transplant. There were no formal inclusion/exclusion criteria.Main outcome measuresThe Kidney PREM has 38 questions in 13 subscales. Responses were captured using a 7-point Likert scale (never 1, always 7). The primary outcome of interest was the mean PREM score calculated across all questions. Multilevel modelling was used to determine the proportion of variation of the mean PREM score across centres due to patient-related and centre-related factors.ResultsThere were records for 8253 HD patients (61% men, 77% white) from 69 renal centres (9–710 patients per centre). There was significant variation in mean PREM score across centres (5.35–6.53). In the multivariable analysis there was some variation in relation to both patient- and centre-level factors but these contributed little to explaining the overall variation. However, multilevel modelling showed that the overwhelming proportion of the explained variance (45%) was explained by variation between centres (40%), only a small proportion of which is identified by measured factors. Only 5% of the variation was related to patient-level factors.ConclusionsCentre rather than patient characteristics determine the experience of care of patients receiving HD. Further work is required to define the characteristics of the treating centre which determine patient experience.
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Camps, Gonzalo A., Andrea Cosacov, and Alicia N. Sérsic. "Centre–periphery approaches based on geography, ecology and historical climate stability: what explains the variation in morphological traits of Bulnesia sarmientoi?" Annals of Botany 127, no. 7 (February 26, 2021): 943–55. http://dx.doi.org/10.1093/aob/mcab034.

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Abstract Background and Aims The centre–periphery hypothesis posits that higher species performance is expected in geographic and ecological centres rather than in peripheral populations. However, this is not the commonly found pattern; therefore, alternative approaches, including the historical dimension of species geographical ranges, should be explored. Morphological functional traits are fundamental determinants of species performance, commonly related to environmental stability and productivity. We tested whether or not historical processes may have shaped variations in tree and leaf traits of the Chaco tree Bulnesia sarmientoi. Methods Morphological variation patterns were analysed from three centre–periphery approaches: geographical, ecological and historical. Tree (stem and canopy) and leaf (leaf size and specific leaf area) traits were measured in 24 populations across the species range. A principal component analysis was performed on morphological traits to obtain synthetic variables. Linear mixed-effects models were used to test which of the implemented centre–periphery approaches significantly explained trait spatial patterns. Key Results The patterns retrieved from the three centre–periphery approaches were not concordant. The historical approach revealed that trees were shorter in centre populations than in the periphery. Significant differences in leaf traits were observed between the geographical centre and the periphery, mainly due to low specific leaf area values towards the geographical centre. We did not find any pattern associated with the ecological centre–periphery approach. Conclusions The decoupled response between leaf and tree traits suggests that these sets of traits respond differently to processes occurring at different times. The geographical and historical approaches showed centres with extreme environments in relation to their respective peripheries, but the historical centre has also been a climatically stable area since the Last Glacial Maximum. The historical approach allowed for the recovery of historical processes underlying variation in tree traits, highlighting that centre–periphery delimitations should be based on a multi-approach framework.
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Hayman, O., and A. Palmer. "CT-based post-implant dosimetry for I-125 prostate brachytherapy: a multi-centre audit in the UK and Ireland." Journal of Radiotherapy in Practice 12, no. 4 (April 22, 2013): 297–304. http://dx.doi.org/10.1017/s1460396912000489.

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AbstractBackground and purposeTo assess the reliability of post-implant CT (PICT) dosimetry for I-125 prostate seed brachytherapy by investigating the variation between centres in performing PICT through a multi-centre audit.Materials and methodsComputerised tomography data sets from four I-125 prostate brachytherapy patients were circulated to nine participating centres. Centres followed local protocol for PICT outlining and seed identification, dosimetry for D90, V100 and V150 for the prostate was reported. Outlines were compared to determine the variation in: quality parameters (D90, V100 and V150), dose-volume histograms and approach to PICT dosimetry between the centres.ResultsThere was significant variation in the prostate outlines drawn by the nine centres; for a prostate with mean volume 43 cm3, the range was 39–57 cm3 which led to variations of D90 of 119–154 Gy (mean 140 Gy) and V100 of 80–93% (mean of 88%). Using automatic seedfinder software reduced discrepancies between centres identifying seeds; overall consistency in seed location was good.ConclusionsThere was a significant uncertainty in the outlining of the prostate volume for PICT dosimetry with an uncertainty value of around ± 20 Gy on D90. PICT is a valuable technique but its accuracy and consistency limitations must be appreciated.
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GOLDBERG, D. P., T. OLDEHINKEL, and J. ORMEL. "Why GHQ threshold varies from one place to another." Psychological Medicine 28, no. 4 (July 1998): 915–21. http://dx.doi.org/10.1017/s0033291798006874.

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Background. No convincing explanation has been forthcoming for the variation in best threshold to adopt for the GHQ in different settings.Methods. Data dealing with the GHQ and the CIDI in 15 cities from a recent WHO study was subjected to further analysis.Results. The mean number of CIDI symptoms for those with single diagnoses, or those with multiple diagnoses, does not vary between cities. However, the best threshold is found to be related to the prevalence both of single and of multiple diagnoses in a centre. Variations in the diagnoses to be included in the ‘gold standard’ did not account for the variation observed. There was a strong relationship between area under the ROC curve (as a measure of the discriminatory power of the GHQ) and the best threshold, with higher thresholds being associated with superior performance of the GHQ. The items on the GHQ-12 that provided most discrimination between cases and non-cases varied from one centre to another.Conclusions. The GHQ threshold is partly determined by the prevalence of multiple diagnoses, with higher thresholds being associated by higher rates of both single and multiple diagnosis. The mean GHQ score for the whole population of respondents provides a rough guide to the best threshold. In those centres where the discriminatory power of the GHQ is lowest, it is necessary to use a low threshold as a way of ensuring that sensitivity is protected, but the positive predictive value of the GHQ is then lower. Some of the variation between centres is due to variation in the discriminatory power of different items.
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Kim, S. J., D. E. Schaubel, J. R. Jeffery, and S. S. A. Fenton. "Centre-specific variation in renal transplant outcomes in Canada." Nephrology Dialysis Transplantation 19, no. 7 (April 6, 2004): 1856–61. http://dx.doi.org/10.1093/ndt/gfh247.

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Diaz, Abbey, Brenda Vo, Peter D. Baade, Veronica Matthews, Barbara Nattabi, Jodie Bailie, Lisa J. Whop, Ross Bailie, and Gail Garvey. "Service Level Factors Associated with Cervical Screening in Aboriginal and Torres Strait Islander Primary Health Care Centres in Australia." International Journal of Environmental Research and Public Health 16, no. 19 (September 27, 2019): 3630. http://dx.doi.org/10.3390/ijerph16193630.

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Aboriginal and Torres Strait Islander women have significantly higher cervical cancer incidence and mortality than other Australian women. In this study, we assessed the documented delivery of cervical screening for women attending Indigenous Primary Health Care (PHC) centres across Australia and identified service-level factors associated with between-centre variation in screening coverage. We analysed 3801 clinical audit records for PHC clients aged 20–64 years from 135 Indigenous PHC centres participating in the Audit for Best Practice in Chronic Disease (ABCD) continuous quality improvement (CQI) program across five Australian states/territories during 2005 to 2014. Multilevel logistic regression models were used to identify service-level factors associated with screening, while accounting for differences in client-level factors. There was substantial variation in the proportion of clients who had a documented cervical screen in the previous two years across the participating PHC centres (median 50%, interquartile range (IQR): 29–67%), persisting over years and audit cycle. Centre-level factors explained 40% of the variation; client-level factors did not reduce the between-centre variation. Screening coverage was associated with longer time enrolled in the CQI program and very remote location. Indigenous PHC centres play an important role in providing cervical screening to Aboriginal and Torres Strait Islander women. Thus, their leadership is essential to ensure that Australia’s public health commitment to the elimination of cervical cancer includes Aboriginal and Torres Strait Islander women. A sustained commitment to CQI may improve PHC centres delivery of cervical screening; however, factors that may impact on service delivery, such as organisational, geographical and environmental factors, warrant further investigation.
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Pasquali, Sara K., Michael G. Gaies, Jeffrey P. Jacobs, J. William Gaynor, and Marshall L. Jacobs. "Centre variation in cost and outcomes for congenital heart surgery." Cardiology in the Young 22, no. 6 (December 2012): 796–99. http://dx.doi.org/10.1017/s104795111200159x.

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AbstractAlthough overall outcomes for children undergoing heart surgery have improved, there is a significant variation in outcomes across hospitals. This review discusses the variation in cost and outcomes across centres performing congenital heart surgery, potential underlying mechanisms, and efforts to reduce variation and improve outcome.
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Sánchez Cuberes, M., M. Vázquez, J. A. Bonet, and M. Sobotka. "Centre-to-limb variation of solar granulation in the infrared." Astronomy & Astrophysics 397, no. 3 (January 2003): 1075–81. http://dx.doi.org/10.1051/0004-6361:20021603.

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Drake, T. M., M. J. Lee, A. Senapati, and S. R. Brown. "Resource variation in colorectal surgery: a national centre level analysis." Colorectal Disease 19, no. 7 (July 2017): 641–48. http://dx.doi.org/10.1111/codi.13596.

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Dissertations / Theses on the topic "Centre variation"

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Tsampalieros, Anne. "Inter-centre Variation in the Management of Kidney Transplant Recipients and Its Impact on Clinical Outcomes." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37266.

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Introduction: There is an increasing number of Canadians living with end stage renal disease (ESRD). Kidney transplantation is currently the best treatment for ESRD but long-term outcomes remain suboptimal. Identifying factors associated with better outcomes may lead to interventions or practice change that could improve patient survival or quality of life. The objectives of this thesis were to: i) systematically review the literature to examine centre variation in kidney transplantation outcomes and identify centre and provider level factors that may contribute to variation in outcomes; ii) describe differences that may exist at the patient, centre and provider level at the time of kidney transplantation across the six transplant centres in Ontario, Canada; iii) examine variation in graft and patient survival rates across transplant centres in Ontario; and iv) examine whether patient, centre and provider level characteristics contribute to variation in graft and survival rates across transplant centres. Methods: The first objective of this thesis was met by conducting a systematic review of the literature according to a predefined protocol. The last three objectives of the thesis were met by conducting a population based retrospective cohort study using administrative data from Ontario. Differences at the patient, centre and provider level were described at the time of kidney transplantation. Outcomes of interest included total graft loss; graft loss with follow-up censored at death; death with graft function; and total mortality. All outcomes were assessed at one year post transplantation and at the end of study follow up. Cox proportional hazards regression was used to obtain hazard ratios (HR) for each centre relative to the average across all centres. The independent effect of centre volume and provider characteristics on outcomes was also examined. Results: The systematic review identified 24 eligible studies. Outcomes included graft survival (n=24) and patient survival (n=9). The main characteristics evaluated were centre volume (n=17) and provider volume (n=2). Centre variation in graft survival was described in 80% (12/15) of studies, while less than half of studies (8/17) found a significant association between volume and graft survival. The population based retrospective cohort included 5092 adults (≥18 years) who received a primary solitary kidney transplant across 6 transplant centres in Ontario between January 1st 2000 and December 31st 2013. Variation in patient, centre and provider level factors existed across centres at the time of transplantation. At the end of study follow-up, case-mix adjusted HRs for total graft loss ranged from 0.84 (95% CI 0.53-1.33) to 1.16 (95% CI 1.00-1.34) across centres (p-value for between centre variation 0.46). After adjusting for centre and provider factors, differences across centres persisted. Centre volume, provider experience and provider type were not independently associated with either short or long-term outcomes (all p>0.05) with the exception of graft loss with follow-up censored at death. Discussion: This thesis suggests that there is variation in clinical outcomes across transplant centres in Ontario which is not explained by patient factors, centre volume or provider characteristics at the time of transplantation. Additionally centre volume, provider type and experience were not independently associated with outcomes. Future prospective studies with a larger sample size of transplant centres that examine follow-up care after discharge from hospital (e.g. frequency of visits) are required to better understand this phenomenon.
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Johnston, Gary Michael, and n/a. "GPS heighting : the effect of the GPS antenna phase center variation on height determination." University of Canberra. Management & Technology, 2000. http://erl.canberra.edu.au./public/adt-AUC20060802.155533.

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This thesis examines the effect on height determination of the antenna phase centre variation of GPS user segment antennae. A discussion of the various antenna types in common use is followed by an explanation of the problem at hand. In particular the effect of the antenna's environment on the phase centre variation is covered more fully, since the phase variation phenomenon itself is largely unexplained in the engineering community to date. A number of examples of the heighting errors caused by this phenomenon are presented, followed by specifically designed experiments, which quantify the effect. Finally the phase centre variation itself is modelled for a particular GPS antenna in common use by surveyors in Australia. The overall conclusion, arrived at by demonstration, is that the antenna phase centre offsets and the variation model are very important for high accuracy determinations of height.
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Martin, Isabelle Giret Noëlle. "Danse contemporaine et bibliothèque un mariage impossible ? Variation en dehors et en dedans de la médiathèque du Centre national de la danse (CND) /." [S.l.] : [s.n.], 2008. http://www.enssib.fr/bibliotheque-numerique/document-1827.

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Mémoire d'études diplôme de conservateur des bibliothèques : Bibliothéconomie : Villeurbanne, ENSSIB : 2008.
Texte intégral. Résumé en français et en anglais. Bibliogr. f. 85-90. Liste des sigles et abréviations.
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Trucat, Philippe. "Variation de l'indice therapeutique Omega chez 100 malades admis sur un mode direct en réanimation polyvalente au centre hospitalier de Mont de Marsan." Bordeaux 2, 1991. http://www.theses.fr/1991BOR2M224.

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Wikenstål, Jakob, and Jakob Wikenstaal. "Kampen för det Urbana Sportcentret." Thesis, Malmö universitet, Fakulteten för lärande och samhälle (LS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-28690.

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Städer förtätas och tillgången till fysisk aktivitet och idrotter i idrottsanläggningar minskar. Mot denna bakgrund lät Malmö stad anlägga en ny typ av idrottsanläggning i en gammal industrilokal i området Sofielund. Anläggningen har fått namnet Urbant Sportcenter.Målet med föreliggande uppsats är att öka kunskapen om denna nya typ av urbana idrottsanläggningar. Syftet är att utifrån en fenomenografisk ansats analysera hur de involverade aktörerna förstår det Urbana Sportcentret i Sofielund, Malmö, som fenomen.Nio involverade aktörer har intervjuats och senare analyserats med hjälp av variationsteorin för att förstå fenomenet Urbant Sportcenter bättre genom att ta reda på hur andra erfar den på olika sätt.Resultatet visar att det finns sex kvalitativt skilda synsätt för hur det Urbana Sportcentret uppfattas i dag och även sex kvalitativt skilda synsätt för hur det Urbana Sportcentret uppfattas bli framöver. Utifrån dessa uppfattningar urskildes två ståndpunkter som de involverade aktörerna erfar som grunden för det Urbana Sportcentret, vilka var samverkan och användningen av den stora hallen. Det fanns många olika planer för hur samverkan och den stora hallen ska fungera. Det kan uppfattas som en kamp om vem som ska få sina planer genomförda och om anläggningen ska rivas eller bli kvar. Med hjälp av variationsteorin identifierades ett gemensamt mål med anläggningen, att skapa en attraktiv plats. Teoretiskt sätt kan de involverade aktörerna öka sin förståelse och således lära sig hur respektive erfar det Urbana Sportcentret med hjälp av att bli medvetna om de olika aspekterna som resultatet redovisat. Slutsatsen från föreliggande studie är att aktörerna inte har delat med sig av sina synsätt och saknar en gemensam kommunikation.
Cities are becoming densified and the accessibility to physical activity and sports at sports facilities is reduced. With this background, Malmö municipality allowed a new type of sports facility in an old industrial area in Sofielund. The facility has been named “Urbant Sportcenter” (the Urban Sports Centre).The aim of the present thesis is to increase the knowledge of this new type of urban sports centres. The purpose is to analyse how the involved actors understands the Urban Sports Centre in Sofielund, Malmö, as a phenomenon based on a phenomenological approach. Nine involved actors have been interviewed and later analysed using the theory of variation to better understand the phenomenon of Urban Sports Centre by finding out how others experience it in different ways.The result shows that there are six qualitatively different ways on how the Urban Sports Centre is perceived today and also six qualitatively different ways on how the Urban Sports Centre is perceived to be in the coming years. Based on these perceptions, two aspects were identified by the involved actors as the basis of the Urban Sports Centre, which were interaction and the use of the major hall. There were many different plans for how the interaction and the big hall should work and it can be perceived as a battle for who will get their plans executed and if the facility is to be demolished or remaining. Using the theory of variation, one common goal was identified with the facility, that is creating an attractive location. Theoretically, the involved actors can increase their understanding and thus learn how to experience the Urban Sports Centre by becoming aware of the different aspects that the results reported. The conclusion from this study is that the actors have not shared their views and lack a common communication.
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Almond, John. "Generalised analytic queueing network models : the need, creation, development and validation of mathematical and computational tools for the construction of analytic queueing network models capturing more critical system behaviour." Thesis, University of Bradford, 1988. http://hdl.handle.net/10454/3741.

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Modelling is an important technique in the comprehension and management of complex systems. Queueing network models capture most relevant information from computer system and network behaviour. The construction and resolution of these models is constrained by many factors. Approximations contain detail lost for exact solution and/or provide results at lower cost than simulation. Information at the resource and interactive command level is gathered with monitors under ULTRIX'. Validation studies indicate central processor service times are highly variable on the system. More pessimistic predictions assuming this variability are in part verified by observation. The utility of the Generalised Exponential (GE) as a distribution parameterised by mean and variance is explored. Small networks of GE service centres can be solved exactly using methods proposed for Generalised Stochastic Petri Nets. For two centre. systems of GE type a new technique simplifying the balance equations is developed. A very efficient "building bglloocbka"l. is presented for exactly solving two centre systems with service or transfer blocking, Bernoulli feedback and load dependent rate, multiple GE servers. In the tandem finite buffer algorithm the building block illustrates problems encountered modelling high variability in blocking networks. A parametric validation study is made of approximations for single class closed networks of First-Come-First-Served (FCFS) centres with general service times. The multiserver extension using the building block is validated. Finally the Maximum Entropy approximation is extended to FCFS centres with multiple chains and implemented with computationally efficient convolution.
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Donguy, Jean Réné. "Contribution à la connaissance des variations climatiques de l'Océan pacifique tropical." Bordeaux 1, 1985. http://www.theses.fr/1985BOR10608.

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Aghassi, Michele Leslie. "Robust optimization, game theory, and variational inequalities." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33670.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2005.
Includes bibliographical references (p. 193-109).
We propose a robust optimization approach to analyzing three distinct classes of problems related to the notion of equilibrium: the nominal variational inequality (VI) problem over a polyhedron, the finite game under payoff uncertainty, and the network design problem under demand uncertainty. In the first part of the thesis, we demonstrate that the nominal VI problem is in fact a special instance of a robust constraint. Using this insight and duality-based proof techniques from robust optimization, we reformulate the VI problem over a polyhedron as a single- level (and many-times continuously differentiable) optimization problem. This reformulation applies even if the associated cost function has an asymmetric Jacobian matrix. We give sufficient conditions for the convexity of this reformulation and thereby identify a class of VIs, of which monotone affine (and possibly asymmetric) VIs are a special case, which may be solved using widely-available and commercial-grade convex optimization software. In the second part of the thesis, we propose a distribution-free model of incomplete- information games, in which the players use a robust optimization approach to contend with payoff uncertainty.
(cont.) Our "robust game" model relaxes the assumptions of Harsanyi's Bayesian game model, and provides an alternative, distribution-free equilibrium concept, for which, in contrast to ex post equilibria, existence is guaranteed. We show that computation of "robust-optimization equilibria" is analogous to that of Nash equilibria of complete- information games. Our results cover incomplete-information games either involving or not involving private information. In the third part of the thesis, we consider uncertainty on the part of a mechanism designer. Specifically, we present a novel, robust optimization model of the network design problem (NDP) under demand uncertainty and congestion effects, and under either system- optimal or user-optimal routing. We propose a corresponding branch and bound algorithm which comprises the first constructive use of the price of anarchy concept. In addition, we characterize conditions under which the robust NDP reduces to a less computationally demanding problem, either a nominal counterpart or a single-level quadratic optimization problem. Finally, we present a novel traffic "paradox," illustrating counterintuitive behavior of changes in cost relative to changes in demand.
by Michele Leslie Aghassi.
Ph.D.
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Benitez, Lionel Ernesto Donatti. "SPATIAL VARIATION OF PHYSICAL PROPERTIES IN AN IRRIGATED FIELD (ARIZONA)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275402.

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Denault, M. (Michel). "Variational inequalities with the analytic center cutting plane method." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34945.

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This thesis concerns the solution of variational inequalities (VIs) with analytic center cutting plane methods (ACCPMs). A convex feasibility problem reformulation of the variational inequality is used; this reformulation applies to VIs defined with pseudo-monotone, single-valued mappings or with maximal monotone, multi-valued mappings.
Two cutting plane methods are presented: the first is based on linear cuts while the second uses quadratic cuts. The first method, ACCPM-VI (linear cuts), requires mapping evaluations but no Jacobian evaluations; in fact, no differentiability assumption is needed. The cuts are placed at approximate analytic centers that are tracked with infeasible primal-dual Newton steps. Linear equality constraints may be present in the definition of the VI's set of reference, and are treated explicitly. The set of reference is assumed to be polyhedral, or is convex and iteratively approximated by polyhedra. Alongside of the sequence of analytic centers, another sequence of points is generated, based on convex combinations of the analytic centers. This latter sequence is observed to converge to a solution much faster than the former sequence.
The second method, ACCPM-VI (quadratic cuts), has cuts based on both mapping evaluations and Jacobian evaluations. The use of such a richer information set allows cuts that guide more accurately the sequence of analytic centers towards a solution. Mappings are assumed to be strongly monotone. However, Jacobian approximations, relying only on mapping evaluations, are observed to work very well in practice, so that differentiability of the mappings may not be required. There are two versions of the ACCPM-VI (quadratic cuts), that differ in the way a new analytic center is reached after the introduction of a cut. One version uses a curvilinear search followed by dual Newton centering steps. The search entails a full eigenvector-eigenvalue decomposition of a dense matrix of the order of the number of variables. The other version uses two line searches, primal-dual Newton steps, but no eigenvector-eigenvalue decomposition.
The algorithms described in this thesis were implemented in the M ATLAB environment. Numerical tests were performed on a variety of problems, some new and some traditional applications of variational inequalities.
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Books on the topic "Centre variation"

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Legislation, Great Britain Parliament House of Commons Seventh Standing Committee on Delegated. Draft Queen Elizabeth II Conference Centre Trading Fund(Variation) Order 2002: Wednesday 3 July 2002. London: Stationery Office, 2002.

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Nitschke, Wolfgang. Photosynthetic reaction centres: Variations on a common structural theme. Amsterdam: Elsevier, 1991.

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Smirnov, N. P. Cikloničeskie centry dejstvija atmosfery Južnogo polušarija i izmenenija klimata =: Cyclonic action centres in the Southern hemisphere and climatic variations. Sankt-Peterburg: RGGMU, 2004.

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Elgar, Enigma variations. Cambridge, UK: Cambridge University Press, 1999.

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Subversive Spinoza: (un)contemporary variations. Manchester: Manchester University Press, 2004.

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Ablbrecht, Schröder Klaus, Hoerschelmann Antonia, Asendorf Christoph 1955-, and Graphische Sammlung Albertina, eds. Edvard Munch: Theme and variation. Vienna: Albertina, 2003.

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Pelaez, Jean-Pierre. Le Barillet: Variations dramatiques : précédé de Lettre à Monsieur le directeur du Centre dramatique national de M. [France]: Cadex, 1992.

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Mielke, Alexander. Hamiltonian and Lagrangian flows on center manifolds: With applications to elliptic variational problems. Berlin: Springer-Verlag, 1991.

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McDonald, Forrest. Requiem: Variations on eighteenth-century themes. Lawrence, Kan: University Press of Kansas, 1989.

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McDonald, Forrest. Requiem: Variations on eighteenth-century themes. Lawrence, Kan: University Press of Kansas, 1988.

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Book chapters on the topic "Centre variation"

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Burgess, Sally. "Centre-Periphery Relations in the Spanish Context: Temporal and Cross-Disciplinary Variation." In The Semiperiphery of Academic Writing, 93–104. London: Palgrave Macmillan UK, 2014. http://dx.doi.org/10.1057/9781137351197_6.

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Baliarti, Endang, Bayu Andri Atmoko, Febri Ariyanti, Nono Ngadiono, I. Gede Suparta Budisatria, Panjono, Tri Satya Mastuti Widi, and Muhammad Danang Eko Yulianto. "Postpartum Oestrus Variation of Local Cows at a Village Breeding Centre in Yogyakarta, Indonesia." In Proceeding of the 1st International Conference on Tropical Agriculture, 377–81. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60363-6_37.

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Minegishi, Makoto. "Center for corpus-based linguistics and language education." In Corpus Analysis and Variation in Linguistics, 3–5. Amsterdam: John Benjamins Publishing Company, 2009. http://dx.doi.org/10.1075/tufs.1.02min.

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Dinkin, Aaron J. "Variant-centered variation and the like conspiracy." In The Locus of Linguistic Variation, 71–96. Amsterdam: John Benjamins Publishing Company, 2018. http://dx.doi.org/10.1075/bct.97.03din.

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Houlihan, Maeve. "Tensions and Variations in Call Centre Management Strategies." In Call Centres and Human Resource Management, 75–101. London: Palgrave Macmillan UK, 2004. http://dx.doi.org/10.1057/9780230288805_4.

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Lindblad, Anne S., Joel W. Novak, and Karl D. Nolph. "Variation in Treatment Outcome According to Center Size." In Continuous Ambulatory Peritoneal Dialysis in the USA, 217–21. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0931-1_22.

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Mackiewicz, Jo. "Volubility, Variation, and Most Frequent Words." In Writing Center Talk over Time, 61–71. New York: Routledge, 2018. | Series: Routledge research in writing studies: Routledge, 2018. http://dx.doi.org/10.4324/9780429469237-4.

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Squibbs, Richard. "Scottish Variations." In Urban Enlightenment and the Eighteenth-Century Periodical Essay, 102–28. London: Palgrave Macmillan UK, 2014. http://dx.doi.org/10.1057/9781137378248_6.

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Thody, Philip. "Themes, Variations and Constants." In Twentieth-Century Literature, 1–47. London: Macmillan Education UK, 1996. http://dx.doi.org/10.1007/978-1-349-24399-0_1.

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Heilmann, Kristine. "Kompetenzentwicklung im Development- Center – Variationen der klassischen Assessment-Center-Methode." In Eignungsdiagnostik im Wandel, 127–48. Göttingen: Vandenhoeck & Ruprecht, 2009. http://dx.doi.org/10.13109/9783666403514.127.

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Conference papers on the topic "Centre variation"

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Leung, Laurence K. H. "Effect of CANDU Bundle-Geometry Variation on Dryout Power." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48827.

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Dryout powers have been evaluated at selected inlet-flow conditions for two proposed designs of CANDU® bundles and compared to those of the 37-element and CANFLEX® bundles. These proposed designs consist of a large centre element (18 mm for one design and 20 mm for the other) and three rings of elements of 11.5 mm in outer diameter. The critical heat flux for each bundle design has been predicted using the correlation derived with Freon data obtained from the corresponding full-scale bundle test. An improvement in dryout power has been shown for the proposed design having a 20-mm centre element with a radial power profile corresponding to the natural-uranium fuel as compared to other bundles, particularly the natural-uranium 37-element bundle, with a symmetric cosine axial power profile. The dryout power improvement is further enhanced for the upstream-skewed axial power profile.
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Khattak, Silvia, Michael Fray, and Laurence Clift. "Call centre employee's reasons for variation in objective productivity during a cognitive ergonomics intervention." In ECCE 2021: European Conference on Cognitive Ergonomics 2021. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3452853.3452860.

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Cerantola, D. J., and A. M. Birk. "The Impact of Centre Body Alignment to Flow Through an Annular Diffuser." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95203.

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Cold air-flow testing was completed over a range of inlet Reynolds numbers of 0.8–3.5 × 105 on several annular diffuser designs to quantify the variation in first order statistics due to misalignment. The procedure involved in attaching the outer duct wall caused a maximum 5% axis shift with respect to the outlet diameter at the diffuser outlet relative to the centre body axis and translated to an approximate inlet variation in height of 2%. This shift was sufficient to distort the flow whereby the quadrant with the greater area at the annular diffuser inlet corresponded to higher total pressure at the outlet. Results showed that static pressure coefficient never varied by more than 3.8% and the outlet velocity uniformity coefficient stayed within 2.4% from reference configurations; however, total pressure coefficient had a larger variation in some cases greater than 10%.
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Ling, Xiang, Yangyan Zheng, and Zhengmai Qian. "An Elastic-Plastic-Creep Finite Element Analysis for Small Punch Creep Test Specimens." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93172.

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An elastic-plastic-creep finite element model, incorporating a Von Mises plastic flow rule and a creep damage equation, was established based on the small punch creep test on Cr5Mo steel specimens at 550 °C and three different loads. Finite element analyses were performed to examine the variation of the central creep deflection and the creep strain with time and the evolution of creep damage. The sensitivity of the creep deflection and equivalent stress at the centre on the disc to mesh size is discussed. Numerical results presented in this paper confirm that the creep damage at the central part is high. The stress gradients are highest near the centre area of the specimen (from 0 to 1 mm). Therefore, accurate stress and strain can be obtained using refined meshes near the specimen center and coarse meshes in other places. The test results are in agreement with those of the numerical simulation and three different stages appearing in the curve of creep deflection, which are quite similar to those observed in conventional creep tests.
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Busby, J., DJ Jackson, AH Mansur, A. Menzies-Gow, LG Heaney, R. Chaudhuri, and PE Pfeffer. "P152 Characteristics of patients in the UK severe asthma registry: variation by ethnicity." In British Thoracic Society Winter Meeting 2019, QEII Centre, Broad Sanctuary, Westminster, London SW1P 3EE, 4 to 6 December 2019, Programme and Abstracts. BMJ Publishing Group Ltd and British Thoracic Society, 2019. http://dx.doi.org/10.1136/thorax-2019-btsabstracts2019.295.

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Banerjee, Kinshuk, Gautam Gangopadhyay, Dipankar Home, Guruprasad Kar, and Archan S. Majumda. "Magnetically induced variation of tunneling current and nonclassicality in a coupled quantum dot system." In 75 YEARS OF QUANTUM ENTANGLEMENT: FOUNDATIONS AND INFORMATION THEORETIC APPLICATIONS: S. N. Bose National Centre for Basic Sciences Silver Jubilee Symposium. AIP, 2011. http://dx.doi.org/10.1063/1.3635856.

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Menzies-Gow, A., T. Haslam, T. Morris, LH Gylvin, ER Bleecker, and C. Nan. "P144 Regional variation in OCS use for UK patients with asthma: heat map analysis." In British Thoracic Society Winter Meeting 2019, QEII Centre, Broad Sanctuary, Westminster, London SW1P 3EE, 4 to 6 December 2019, Programme and Abstracts. BMJ Publishing Group Ltd and British Thoracic Society, 2019. http://dx.doi.org/10.1136/thorax-2019-btsabstracts2019.287.

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Frost, F., R. Peat, S. Town, C. Brockelsby, L. Johns, and E. Hilal. "P154 Gender and height drive variation between forced vital capacity reference equations: implications for ipf treatment." In British Thoracic Society Winter Meeting 2017, QEII Centre Broad Sanctuary Westminster London SW1P 3EE, 6 to 8 December 2017, Programme and Abstracts. BMJ Publishing Group Ltd and British Thoracic Society, 2017. http://dx.doi.org/10.1136/thoraxjnl-2017-210983.296.

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Kenna, D., N. Mustafa, C. Peters, J. Turton, and RJ Langley. "P64 An in-silico investigation of DNA repair gene variation in the mycobacteroides abscessus subspecies abscessus ST26 clonal lineage." In British Thoracic Society Winter Meeting 2019, QEII Centre, Broad Sanctuary, Westminster, London SW1P 3EE, 4 to 6 December 2019, Programme and Abstracts. BMJ Publishing Group Ltd and British Thoracic Society, 2019. http://dx.doi.org/10.1136/thorax-2019-btsabstracts2019.207.

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Dennis, R., N. Leggatt, C. T. Watson, E. Kingston, and D. J. Smith. "Residual Stress Finite Element Analysis and Measurements of a Tube Penetration J-Groove Attachment Weld in a Hemispherical Head of a Large Ferritic Pressure Vessel: Part II — Outer Nozzle." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93699.

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A programme of work was undertaken to gain an understanding of the residual stress levels in the tube penetration J-groove welds in a hemispherical head of a large stainless steel clad ferritic pressure vessel. This second part of a two-part paper describes the finite element analysis that was carried out to model an off-centre outer tube to vessel head weld. A 3D finite element residual stress model was developed. The complex bead deposition sequence of the actual weld was simulated by a bead lumping approach using 9 passes. The results from the finite element analyses were compared with both surface and through thickness stress measurements. These measurements were taken on a mock weld that was representative of the actual component. The surface measurements were taken by using an incremental centre hole drilling technique. The through thickness values were obtained from deep hole drilling measurements at three positions around the circumference of the weld. For this off-centre penetration the cladding process was not modelled nor was clad applied to the test mock-up. The finite element results and the measured values showed similar trends in the variation of stress around the circumference of the weld. A poor correlation between measurements and analytical results was obtained at the lower hillside position. A major reason for the discrepancy is believed to be that the bead lumping approach that was used in the finite element model was not a sufficiently refined representation of the actual weld bead deposition sequence. Note however that one of the aims of this finite element analysis was to quantify the variations between the centre tube presented in the first part of this paper and the off centre tube presented here. In this regard the finite element model and measurements compared well. The finite element model was also used to carry out two sensitivity studies that investigated the effects upon residual stress of tube geometry and material properties. For the case where a nozzle tube was extended significantly below the vessel head inner surface the results showed the stresses to be significantly higher than the baseline case.
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Reports on the topic "Centre variation"

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Szołtysek, Mikołaj, Siegfried Gruber, Sebastian Klüsener, and Joshua R. Goldstein. Spatial variation in household structures in 19th-century Germany. Rostock: Max Planck Institute for Demographic Research, October 2010. http://dx.doi.org/10.4054/mpidr-wp-2010-030.

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J. Squire, H. Qin and W. Tang. Gauge Properties Of The Guiding Center Variational Symplectic Integrator. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1063125.

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Sorensen, Frank C. Genetic variation and seed transfer guidelines for ponderosa pine in central Oregon. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1994. http://dx.doi.org/10.2737/pnw-rp-472.

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Sorensen, Frank C. Genetic variation and seed transfer guidelines for lodgepole pine in central Oregon. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1992. http://dx.doi.org/10.2737/pnw-rp-453.

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Brooks, E., and A. Szoke. A Variational Method for Interpolation Between Zone Centers in 2-D Geometry. Office of Scientific and Technical Information (OSTI), May 2013. http://dx.doi.org/10.2172/1079655.

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Sorensen, Frank C., and John C. Weber. Genetic variation and seed transfer guidelines for ponderosa pine in the Ochoco and Malheur National Forests of central Oregon. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1994. http://dx.doi.org/10.2737/pnw-rp-468.

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Weber, John C., and Frank C. Sorensen. Geographic variation in speed of seed germination in central Oregon ponderosa pine (Pinus ponderosa Dougl. ex Laws.). Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1992. http://dx.doi.org/10.2737/pnw-rp-444.

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H. Qin and X. Guan. Variational Symplectic Integrator for Long-Time Simulations of the Guiding-Center Motion of Charged Particles in General Magnetic Fields. Office of Scientific and Technical Information (OSTI), February 2008. http://dx.doi.org/10.2172/960290.

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Rosenbloom, Joshua. Was There a National Labor Market at the End of the Nineteenth Century? Intercity and Interregional Variation in Male Earnings in Manufacturing. Cambridge, MA: National Bureau of Economic Research, October 1994. http://dx.doi.org/10.3386/h0061.

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Gardiner, James, R. Thomas, Thai Phan, Mengling Stuckman, Richard Spaulding, Harry Edenborn, Christina Lopano, and Alexandra Hakala. Geochemical Variation of Produced Waters and Overlying Groundwaters at an Active CO2 Enhanced Oil Recovery Field in the Permian Basin Central Platform. Office of Scientific and Technical Information (OSTI), March 2021. http://dx.doi.org/10.2172/1769610.

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