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Search Results: 1 - 10 of 463349 matches for " Perry A Ball "
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A prospective study of tracheopulmonary complications associated with the placement of narrow-bore enteral feeding tubes
Athos J Rassias, Perry A Ball, Howard L Corwin
Critical Care , 1998, DOI: 10.1186/cc120
Abstract: Seven hundred and forty feeding tubes were inserted during the study period. In 14 cases (2%), the feeding tube was inserted into the tracheopulmonary system. Five patients (0.7%) suffered a major complication, including two (0.3%) who died from complications directly related to the feeding tube placement. All patients had altered consciousness and 13 of the 14 had endotracheal tubes in place. Malposition of the feeding tube was not predictable from clinical signs and auscultation, but was detectable by chest roentgenogram.Inadvertent insertion of enteral feeding tubes into the tracheopulmonary system during placement is associated with significant morbidity and mortality. Clinical signs at the time of insertion are not useful in identifying feeding tubes which are malpositioned. In the ICU patient, a chest roentgenogram is required after all feeding tube insertions prior to the initiation of enteral feeding. In the high-risk patient, alternatives to blind feeding tube insertion should be considered.Enteral feeding is now generally recognized as the preferred method for providing nutritional support to critically ill patients. When compared to parenteral nutrition, enteral feeding is considered to be both safer and associated with improved outcome [1]. Over the last two decades narrow-bore enteral feeding tubes have gained widespread acceptance as the preferred device for providing enteral nutrition. They were introduced in response to problems associated with the stiffer larger-bore tubes [2, 3]. The narrow-bore tubes are softer, made from silastic, and generally provide for greater patient comfort and fewer erosive complications than occur with the larger type. Most tubes of this type have a removable steel stylet, which makes them stiffer and allows for easier passage. A particular advantage of enteral feeding is the avoidance of the risk associated with placement of a central venous catheter [4, 5]. However, the use of feeding tubes is not without its own compli
Differences in Student Engagement: Investigating the Role of the Dominant Cognitive Processes Preferred by Engineering and Education Students
Ian Ball,Chris Perry
Education Research International , 2011, DOI: 10.1155/2011/414068
Abstract: This paper reports on a study of the differences in the dominant cognitive processes preferred by groups of engineering and education students and examines the implications of these differences for the assessment of student engagement with university courses. Concern is expressed that the items commonly used to capture student engagement data do not adequately cover the full range of the dominant cognitive processes preferred by tertiary students. The paper sets out a brief overview of student engagement along with the theory of dominant and auxiliary cognitive processes, as developed by Jung and later by Myers. Evidence is presented of the differing frequencies of the eight cognitive processes, as assessed by the Myers-Briggs Type Indicator, that are preferred by cohorts of students undertaking courses in engineering and education. The implications of these differences are discussed in the context of subject disciplines in university environments.
Differences in Student Engagement: Investigating the Role of the Dominant Cognitive Processes Preferred by Engineering and Education Students
Ian Ball,Chris Perry
Education Research International , 2011, DOI: 10.1155/2011/414068
Abstract: This paper reports on a study of the differences in the dominant cognitive processes preferred by groups of engineering and education students and examines the implications of these differences for the assessment of student engagement with university courses. Concern is expressed that the items commonly used to capture student engagement data do not adequately cover the full range of the dominant cognitive processes preferred by tertiary students. The paper sets out a brief overview of student engagement along with the theory of dominant and auxiliary cognitive processes, as developed by Jung and later by Myers. Evidence is presented of the differing frequencies of the eight cognitive processes, as assessed by the Myers-Briggs Type Indicator, that are preferred by cohorts of students undertaking courses in engineering and education. The implications of these differences are discussed in the context of subject disciplines in university environments. 1. Discussion 1.1. Student Engagement Research in education has progressively moved from focusing on the content of knowledge (the “what”), to now encompass an examination on the process of knowledge (the “how”), such that the “current goals for learning go beyond the basics and disciplinary knowledge to include the strategies, capacities, qualities, characteristics and values needed for successful living in the modern world” [1]. Opportunities taken up at universities for participation in educationally purposeful activities are seen to influence the outcomes of student learning and achievement. Student engagement has become a concept of interest to those working in higher education, specifically those in universities as engagement serves as an indicator of successful learning and as an outcome of effective teaching [2]. Universities as institutions have become concerned about the level of engagement displayed by their students. Thus student engagement is increasingly understood to be an important aspect of quality in higher education. One common perspective in the research on student achievement is to identify the qualities shown by students that are conducive to engagement with learning. Kuh [3] asserts that “engagement tends to have conditional effects, with students with certain characteristics benefiting from some type of activities more so than other students.” Engagement relates to all aspects of a student’s involvement in a course, both formal and informal elements of the curriculum. For this study, engagement is defined as “students’ involvement with activities and conditions likely to generate high
Global Well-Posedness and Long-time Asymptotics for the Defocussing Davey-Stewartson II Equation in $H^{1,1}(R^2)$
Peter A. Perry
Mathematics , 2011,
Abstract: We show that the inverse scattering map for the linear system associated with the defocussing Davey-Stewartson II equation is locally Lipschitz continuous with locally Lipschitz continuous inverse on $H^{1,1}(R^2)$. From the inverse scattering method we then obtain global well-posedness for the defocussing Davey-Stewartson II equation. We show that these global solutions are dispersive by computing their leading asymptotic behavior as $t \rightarrow \infty$ in terms of an associated linear problem.
Miura Maps and Inverse Scattering for the Novikov-Veselov Equation
Peter A. Perry
Mathematics , 2012,
Abstract: We use the inverse scattering method to construct classical solutions for the Novikov-Veselov (NV) equation, solving a problem posed by Lassas, Mueller, Siltanen, and Stahel. We exploit Bogadanov's Miura-type map which transforms solutions of the modified Novikov-Veselov (mNV) equation into solutions of the NV equation. We show that the Cauchy data of conductivity type considered by Lassas, Mueller, Siltanen, and Stahel correspond precisely to the range of the Miura map, so that it suffices to study the mNV equation. We solve the mNV equation using the scattering transform associated to the defocussing Davey-Stewartson II equation.
Assessing Injection Techniques in the Treatment of Trigger Finger  [PDF]
John R Fowler, Lauren Ogrich, Perry Evangelista, Alyssa A Schaffer
Modern Plastic Surgery (MPS) , 2012, DOI: 10.4236/mps.2012.24020
Abstract: Background: Trigger finger is characterized by the inability to smoothly flex and extend the digit. Corticosteroids are an accepted non-surgical treatment option and can be delivered via two techniques. While the palmar approach is more commonly used, some have suggested that the mid-axial approach may be less painful for patients and yield higher intrasheath injection rates. The purpose of this study is to compare the accuracy of the palmar and midaxial approaches for delivery of corticosteroids into the flexor tendon sheath using radio-opaque dye in a cadaver model. Methods: A total of 50 injections were performed, 25 via midaxial technique and 25 via palmar technique. A one inch, 25-gauge needle was used to inject 1 mL of Isovue contrast dye into the flexor tendon sheath under live fluoroscopy. The fluoroscopic images were examined after injection to determine intrasheath versus extrasheath delivery of the dye, with visualization of contrast filling the sheath defining a successful injection. Results: The midaxial approach had a success rate of 52% compared to the conventional palmar approach success rate of 36%, p=0.5. The ring finger is the most common location of trigger finger and the rates of success were equal between groups for this digit (80%). Conclusions: Based on our findings, there is no statistical difference in the accuracy of intrasheath injection between the midaxial technique and palmar technique. The midaxial technique can be considered as an alternative to the palmar technique for trigger finger injection.
Global Solar Variations and Effects of Relativistic 2D-Hydrogen  [PDF]
G. Dreschhoff, H. Jungner, K. W. Wong, C. A. Perry
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.68114
Abstract: Characteristics of the temporal evolution of the global solar magnetic field were found to display a 2-step cycling mode consistent with a pattern of a fundamental harmonic progression underlying all solar cycles at all times and having its seat in the fusion region of the core via nuclear magnetic resonance as part of the hydrogen and helium fusion chain. In addition to the three principal zones in the interior of the sun, core, radiative zone, and convection zone, a sub-surface layer is being suggested to take part in the processes of varying solar activity, which would be an extension of relativistic 2D hydrogen being formed throughout the plasma body under the influence of pressure waves originating in the core. The major participants confined to such a 2D layer is for the most part 2D hydrogen particularly in its form of relativistic 2D hydrogen, where the Bohratom binding energies are replaced by binding energies in the range of Eo = 0.5 MeV. For this reason it is conjectured that this condition lends itself to providing contributions to (a) the energy release including 0.5 MeV and lower energy γ-photons as well as (b) superimposing a radial component to the global dipole field.
Cdc25 and Wee1: analogous opposites?
Jennifer A Perry, Sally Kornbluth
Cell Division , 2007, DOI: 10.1186/1747-1028-2-12
Abstract: Entry into mitosis is driven by the activity of the cell cycle regulatory kinase, Cdc2/Cyclin B, which oscillates throughout the cell cycle, peaking in mitosis and dropping during interphase. This precise temporal regulation is ensured by the coordinate action of positive and negative regulators of Cdc2 catalytic activity and localization. During interphase, once Cyclin B synthesis has begun, the newly formed Cdc2/Cyclin B complexes are kept inactive by phosphorylation on Cdc2 at two residues, Thr14 and Tyr15. These phosphorylations are catalyzed by the Myt1 and Wee1 kinases, which are located at cytoplasmic membranes and within the nucleus, respectively. At the G2/M transition, Myt1 and Wee1 are inactivated while the dual specificity phosphatase, Cdc25, is activated. Cdc25 dephosphorylates Thr14 and Tyr15, allowing for activation of the Cdc2/Cyclin B complex and entry into mitosis [1,2].Just as Cdc2/Cyclin B activation is highly regulated, both Wee1 and Cdc25 activity are tightly controlled through the cell cycle. Interestingly, in considering what we know currently about the regulation of Wee1 and Cdc25, it appears that these two molecules are similarly regulated, though their activities oscillate in opposition to one another, consistent with their respective roles in inhibiting or activating mitotic entry. Both are phosphorylated and bind to 14-3-3 during interphase; both are controlled directly by other mitotic kinases, including Polo-like kinases and Cdc2/Cyclin B itself. Integrating data from yeast, Xenopus, and mammalian cells over the last decade, we can now take a comprehensive look at how cells coordinate the opposing actions of Wee1 and Cdc25 via post-translational modifications in order to regulate Cdc2/Cyclin B and entry into mitosis.The Cdc25 family of phosphatases is responsible for dephosphorylating inhibitory Tyr and Thr residues on cyclin-dependent kinases in order to promote their activation. Three isoforms (A, B and C) have been identified in mam
Dynamic D8-branes in IIA string theory
A. Chamblin,M. J. Perry
Physics , 1997,
Abstract: In this paper we perform a detailed investigation of the Dirichlet eight-brane of the Type IIA string theory, when the effects of gravity are included. In particular, consider what happens when one allows the ten-form field strength $F_{10}$ to vary discontinuously across the worldvolume of the brane. Since the ten-form is constant on each side of the brane ($d*F_{10} = 0$), a variation in the bulk term $\int F_{10}*F_{10}$ gives rise to a net pressure acting on the surface of the brane. This means that the infinite `planar' eight-brane is no longer a static configuration with these boundary conditions. Instead, a static configuration is found only when the brane `compactifies' to the topology of an eight-sphere, $S^8$. These spherical eight-branes are thus bubbles which form boundaries between different phases of the massive Type IIA supergravity theory. While these bubbles are generically unstable and will want to expand (or contract), we show that in certain cases there is a critical radius, $r_c$, at which the (inward) tension of the brane is exactly counterbalanced by the (outward) force exerted by the pressure terms. Intuitively, these `compactified' branes are just spherical bubbles where the effective cosmological constant jumps by a discrete amount as you cross a brane worldsheet. We argue that these branes will be unstable to various semi-classical decay processes. We discuss the implications of such processes for the open strings which have endpoints on the eight-brane.
Inverse scattering results for manifolds hyperbolic near infinity
D. Borthwick,P. A. Perry
Mathematics , 2009,
Abstract: We study the inverse resonance problem for conformally compact manifolds which are hyperbolic outside a compact set. Our results include compactness of isoresonant metrics in dimension two and of isophasal negatively curved metrics in dimension three. In dimensions four or higher we prove topological finiteness theorems under the negative curvature assumption.
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