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Search Results: 1 - 10 of 8205 matches for " Ian Cooper "
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Effect of Sub-Grains and Crystal Defects on Monolike Si Solar Cell Performance  [PDF]
Chris Yang, Hao Wu, Ian Cooper
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.42011

This paper investigates crystalline orientation in monolike silicon wafers and its effect on solar cell performance. Monolike silicon wafers from two different bricks cut from interior and corner region of an ingot were compared. The mono grain in the interior brick is nearly perfect, but there are some large oblong shaped sub-grains in the corner brick. The large sub-grains at corner brick wafers are oriented at (311), instead of (100) orientation. The (311) grains contain high density of dislocation and cannot be effectively textured by alkaline solution, therefore lowering the cell efficiency significantly. There is about 0.86% (abs) cell efficiency reduction on the monolike cells that contain large sub-grains.

Management of ureteric endometriosis associated with hydronephrosis: An Australian case series of 13 patients
Ian AR Smith, Michael Cooper
BMC Research Notes , 2010, DOI: 10.1186/1756-0500-3-45
Abstract: One hundred and twenty-six women underwent ureterolysis for ureteric endometriosis betweeen and October 1996 and June 2009. Thirteen of the 126 women were identified as having ureteric obstruction at the time of their procedure and were included in the case series. The median age was 39.5 (30 - 63). Chronic pelvic pain was the most common presenting symptom (53.8%). The point of ureteric obstruction was noted to occur most commonly at a small segment of distal left ureter, where it is crossed by the uterine artery (54%). Seven of the 13 women (53.8%) were successfully managed with ureterolysis only. Three of the 13 women (21.3%) underwent ureterolysis and placement of a double J ureteric stent. Three of the 13 (21.3%) required a segmental ureteric resection. There was one incidence of inadvertent thermal ureteric injury which was managed with a ureteric stent. In all cases the hydronephrosis had resolved at six months follow up.Our findings support the growing body of literature supporting ureterolysis as the optimal treatment for ureteric endometriosis causing moderate to severe ureteric obstruction.Endometriosis is a benign disease defined by the presence of ectopic endometrial glands and stroma, often associated with pelvic pain and infertility. The incidence of endometriosis in the reproductive age group is estimated at 3-10% [1].Endometriosis involving the urinary tract includes the presence of endometrial tissue within or around the bladder, ureters, urethra, or kidney. Ureteric endometriosis is usually unilateral, most commonly involving a small segment of distal left ureter [2,3]. It is often associated with retroperitoneal fibrosis and peri-ureteric cicatrization. It has an incidence of < 1% [3-5].Ureteric obstruction resulting in hydronephrosis is a rare manifestation of ureteric endometriosis. It occurs as a consequence of intrinsic involvement within the ureter of endometriosis, or from extrinsic compression of the ureter by a pelvic endometrioma [6]. In
Boundary Conditions and Heterotic Construction in Topological Membrane Theory
Leith Cooper,Ian I. Kogan
Physics , 1996, DOI: 10.1016/0370-2693(96)00772-1
Abstract: Using the topological membrane approach to string theory, we suggest a geometric origin for the heterotic string. We show how different membrane boundary conditions lead to different string theories. We discuss the construction of closed oriented strings and superstrings, and demonstrate how the heterotic construction naturally arises from a specific choice of boundary conditions on the left and right boundaries of a cylindrical topological membrane.
Media analysis and production: developing multiliteracies in technology-enhanced environments
Natalie Cooper,Lori Lockyer,Ian Brown
ITALICS , 2006,
Abstract: The transformation of our lives through new technologies and globalisation presents educators with the challenge of helping students to develop the skills and competencies that will enable them to function successfully in this dynamic society. This article reports on a single-case pilot study conducted to trial and evaluate an educational program and support resources. The purpose of this research was to explore whether this educational program implemented within a technology-rich environment, incorporating teaching and learning strategies based on constructivist approaches, supports the development of multiliteracies. A Grade 10 English class in a high school in New South Wales, Australia participated in the educational program that involved the analysis, construction and evaluation of media and news items. The study addressed the question of how the participation in a media analysis and production curriculum unit, influences the development of multiliteracies. Students’ understanding and use of key media, information, visual and technological concepts, as well as their understanding and use of technology were explored. The findings suggest that the implementation of such a program can assist students in developing multiliteracies and that most students found the experience of digital video construction motivating. Based on the findings from the pilot study the educational program and resources were revised and refined prior to the implementation of the study across multiple cases in the subsequent academic year.
Rapid tests and urine sampling techniques for the diagnosis of urinary tract infection (UTI) in children under five years: a systematic review
Penny Whiting, Marie Westwood, Ian Watt, Julie Cooper, Jos Kleijnen
BMC Pediatrics , 2005, DOI: 10.1186/1471-2431-5-4
Abstract: We conducted a systematic review to determine the diagnostic accuracy of rapid tests for detecting UTI in children under five years of age.The evidence supports the use of dipstick positive for both leukocyte esterase and nitrite (pooled LR+ = 28.2, 95% CI: 17.3, 46.0) or microscopy positive for both pyuria and bacteriuria (pooled LR+ = 37.0, 95% CI: 11.0, 125.9) to rule in UTI. Similarly dipstick negative for both LE and nitrite (Pooled LR- = 0.20, 95% CI: 0.16, 0.26) or microscopy negative for both pyuria and bacteriuria (Pooled LR- = 0.11, 95% CI: 0.05, 0.23) can be used to rule out UTI. A test for glucose showed promise in potty-trained children. However, all studies were over 30 years old. Further evaluation of this test may be useful.Dipstick negative for both LE and nitrite or microscopic analysis negative for both pyuria and bacteriuria of a clean voided urine, bag, or nappy/pad specimen may reasonably be used to rule out UTI. These patients can then reasonably be excluded from further investigation, without the need for confirmatory culture. Similarly, combinations of positive tests could be used to rule in UTI, and trigger further investigation.Urinary tract infection (UTI) is one of the most common sources of infection in children under 5. In a small proportion of children UTI may lead to renal scarring [1,2]. This outcome of infection is of concern as it is associated with significant future complications and ultimately with end stage renal disease[3]. Prompt diagnosis and treatment is therefore important to reduce the risk of future scarring.Clinical history and examination is the first step in any diagnosis and is the means of identifying children with suspected UTI. Elements of the clinical examination have also been evaluated as diagnostic tests for UTI but there is little data available on these. Urine tests are commonly used for the diagnosis of UTI.The reference standard for the diagnosis of UTI in children is considered to be any bacterial growth
String Winding Modes From Charge Non-Conservation in Compact Chern-Simons Theory
Leith Cooper,Ian I. Kogan,Kai-Ming Lee
Physics , 1996, DOI: 10.1016/S0370-2693(96)01692-9
Abstract: In this letter we show how string winding modes can be constructed using topological membranes. We use the fact that monopole-instantons in compact topologically massive gauge theory lead to charge non-conservation inside the membrane which, in turn, enables us to construct vertex operators with different left and right momenta. The amount of charge non-conservation inside the membrane is interpreted as giving the momentum associated with the string winding mode and is shown to match precisely the full mass spectrum of compactified string theory.
Dynamical Description of Spectral Flow in N=2 Superconformal Field Theories
Leith Cooper,Ian I. Kogan,Richard J. Szabo
Physics , 1997, DOI: 10.1016/S0550-3213(97)00291-5
Abstract: We show how the spectral flow between the Neveu-Schwarz and Ramond sectors of N=2 superconformal field theories can be described in three dimensions in terms of the propagation of charged particles coupled to a a Chern-Simons gauge theory. Quantum mechanical mixing between the degenerate Chern-Simons vacua interpolates between the different boundary conditions of the two sectors and so provides a dynamical picture for the GSO-projection.
Beyond the excised ensemble: modelling elliptic curve L-functions with random matrices
Ian A. Cooper,Patrick W. Morris,Nina C. Snaith
Mathematics , 2015,
Abstract: The `excised ensemble', a random matrix model for the zeros of quadratic twist families of elliptic curve $L$-functions, was introduced by Due\~nez, Huynh, Keating, Miller and Snaith. The excised model is motivated by a formula for central values of these $L$-functions in a paper by Kohnen and Zagier. This formula indicates that for a finite set of $L$-functions from a family of quadratic twists, the central values are all either zero or are greater than some positive cutoff. The excised model imposes this same condition on the central values of characteristic polynomials of matrices from $SO(2N)$. Strangely, the cutoff on the characteristic polynomials that results in a convincing model for the $L$-function zeros is significantly smaller than that which we would obtain by naively transferring Kohnen and Zagier's cutoff to the $SO(2N)$ ensemble. In this current paper we investigate a modification to the excised model. It lacks the simplicity of the original excised ensemble, but it serves to explain the reason for the unexpectedly low cutoff in the original excised model. Additionally, the distribution of central $L$-values is `choppier' than the distribution of characteristic polynomials, in the sense that it is a superposition of a series of peaks: the characteristic polynomial distribution is a smooth approximation to this. The excised model didn't attempt to incorporate these successive peaks, only the initial cutoff. Here we experiment with including some of the structure of the $L$-value distribution. The conclusion is that a critical feature of a good model is to associate the correct mass to the first peak of the $L$-value distribution.
A Rare Case of Antepartum Spontaneous Septostomy in a Monochorionic Diamniotic Twin Pregnancy
Rati Chadha,Ian R. Lange,Lisa Bratz,Stephanie L. Cooper,Anne Roggensack,Jo-Ann Johnson
Case Reports in Obstetrics and Gynecology , 2012, DOI: 10.1155/2012/748614
Abstract: Spontaneous septostomy in a monochorionic diamniotic twin pregnancy is a rare phenomenon. We present a case of monochorionic diamniotic twin pregnancy with an intact dividing membrane seen in the 1st half of the pregnancy. At 26 weeks, when she was assessed for preterm contractions, the dividing membrane was not documented, which suggested spontaneous septostomy. There had been no invasive procedures during the pregnancy. She subsequently delivered at 29 weeks, secondary to preterm labor. No dividing membrane was noticed at the time of caesarian section. Spontaneous septostomy can complicate the management of monochorionic diamniotic twins by creating a pseudomonoamniotic environment resulting in cord entanglement, and difficulty in the diagnosis and management of twin-twin transfusion syndrome. We believe that such a case should be managed as monochorionic monoamniotic twin gestation.
Further investigation of confirmed urinary tract infection (UTI) in children under five years: a systematic review
Marie E Westwood, Penny F Whiting, Julie Cooper, Ian S Watt, Jos Kleijnen
BMC Pediatrics , 2005, DOI: 10.1186/1471-2431-5-2
Abstract: We conducted a systematic review to determine the most effective approach to the further investigation of confirmed urinary tract infection (UTI) in children under five years of age.73 studies were included. Many studies had methodological limitations or were poorly reported.Effectiveness of further investigations: One study found that routine imaging did not lead to a reduction in recurrent UTIs or renal scarring.Diagnostic accuracy: The studies do not support the use of less invasive tests such as ultrasound as an alternative to renal scintigraphy, either to rule out infection of the upper urinary tract (LR- = 0.57, 95%CI: 0.47, 0.68) and thus to exclude patients from further investigation or to detect renal scarring (LR+ = 3.5, 95% CI: 2.5, 4.8). None of the tests investigated can accurately predict the development of renal scarring. The available evidence supports the consideration of contrast-enhanced ultrasound techniques for detecting vesico-ureteric reflux (VUR), as an alternative to micturating cystourethrography (MCUG) (LR+ = 14.1, 95% CI: 9.5, 20.8; LR- = 0.20, 95%CI: 0.13, 0.29); these techniques have the advantage of not requiring exposure to ionising radiation.There is no evidence to support the clinical effectiveness of routine investigation of children with confirmed UTI. Primary research on the effectiveness, in terms of improved patient outcome, of testing at all stages in the investigation of confirmed urinary tract infection is urgently required.UTI in children is an important clinical problem. Renal scarring, which occurs in a small proportion of children (approximately 6%[1]), is the most important outcome of infection as it is associated with significant future complications[2], and ultimately with end stage renal disease[3]. Young children are considered particularly vulnerable to renal scarring and its consequences[4]. However, a recently completed 20-year follow-up study suggested that compensatory mechanisms mean no significant changes in
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