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Precision measurements of charm hadron properties at Babar
Zachary Huard
Physics , 2012,
Abstract: We present preliminary results on the natural line width, $\Gamma(D^{*+})$, in the transition $D^{*}(2010)^{+} \rightarrow D^0 \pi^+$. The $D^0$ is reconstructed in two decay channels: $D^0 \rightarrow K^-\pi^+$ and $D^0 \rightarrow K^-\pi^+\pi^-\pi^+$. We use Monte Carlo to simulate our reconstruction resolution in the difference of the reconstructed $D^{*+}$ and reconstructed $D^0$ masses. We fit a relativistic P-wave Breit-Wigner form convolved with the measured resolution, together with a background function, to the mass difference distribution. For the decay mode $D^0\rightarrow K^-\pi^+$ we obtain $\Gamma = 83.5 \pm 1.7 \pm 1.2$ keV and $\Delta m = m_{D^{* +}} - m_{D^0} = 145425.5 \pm 0.6 \pm 2.6$ keV, where the quoted errors are statistical and systematic, respectively. For the $D^0\rightarrow K^-\pi^+\pi^-\pi^+$ mode, we do not quote a width measurement at this time, but measure $\Delta m = m_{D^{* +}} - m_{D^0} = 145426.5 \pm 0.4 \pm 2.6 $ keV. Additionally, we present preliminary results from the decay mode $\Lambda_c (2880)^+ \rightarrow \Lambda_c^+\pi^+\pi^-$ for the mass, width and quasi-two-body branching ratios of the $\Lambda_c(2880)^+$ baryon. We measure $m(\Lambda_c(2880)^+) - m(\Lambda_c(2286)^+) = 594.9 \pm 0.4 \pm 0.3$ MeV and $\Gamma(\Lambda_c(2880)^+) = 6.2 \pm 1.4 \pm 1.5$ MeV, where the errors are statistical and systematic, respectively.
Conditionally invariant solutions of the rotating shallow water wave equations
Benoit Huard
Mathematics , 2010, DOI: 10.1088/1751-8113/43/23/235205
Abstract: This paper is devoted to the extension of the recently proposed conditional symmetry method to first order nonhomogeneous quasilinear systems which are equivalent to homogeneous systems through a locally invertible point transformation. We perform a systematic analysis of the rank-1 and rank-2 solutions admitted by the shallow water wave equations in (2 + 1) dimensions and construct the corresponding solutions of the rotating shallow water wave equations. These solutions involve in general arbitrary functions depending on Riemann invariants, which allow us to construct new interesting classes of solutions.
Organizational innovation and chronic care. 1. Cooperation between distant partners
Huard P,Schaller P
Pratiques et Organisation des Soins , 2011,
Abstract: Summary Improvement in the treatment of chronic diseases and psychosocial ailments depends to a great extent on better cooperation and coordination between the various stakeholders. A number of innovative initiatives such as networks have been launched to promote care integration, but they very often come up against the problem of the distances between participants, which leads to compartmentalisation and dispersion. First, the article tries to define the different forms of distances causing the problems. Next, it focuses on measures that might reduce the distance between professionals. Such measures might involve strengthening the communication between them, mobilising them around a cooperation project or setting up a steering process to reconcile their various objectives and attitudes. Lastly, the article analyses the dynamic processes that enable innovative projects to develop and become new benchmarks for the healthcare system. Prat Organ Soins. 2011;42(2):111-118
Improving chronic disease management – 1. The problem
Huard P,Schaller P
Pratiques et Organisation des Soins , 2010,
Abstract: Western health systems are often said to be in a state of crisis. The first article explores how this problem can be defined in detail and reviews the difficulties in finding relevant solutions. In the second article, the authors seek to define a strategy to facilitate the implementation of the necessary changes. In the first article, “Improving chronic disease management – 1. the problem”, the issue is explored as it relates in particular to the evolution of morbidity over long periods of time. The following points are successively discussed: – an explanation is first sought for the difference in the efficiencies of managing acute conditions and chronic disease. The authors examine how the principle of autonomy of medical decision- aking which is at the basis of western health systems and the modularity of these health systems give rise to a paradox, whereby progress in the efficiency of acute disease management ends up negatively affecting the system as a whole; – the authors then address the organizational shortcomings of the system and describe in detail the causes and consequence of the predominance of hospital medicine and the lagging position of ambulatory medicine; – in the third part of the article, specific examples in France and Switzerland are analyzed to reveal some of the reasons for the often mediocre results obtained with measures implemented for better management of chronic pathologies. This analysis emphasizes the importance of strategies that are capable of bringing about the necessary changes. Prat Organ Soins. 2010;41(3):237-245
Organizational innovation and chronic care. 2. Two case studies
Huard P,Schaller P
Pratiques et Organisation des Soins , 2011,
Abstract: Summary This article applies the principles elucidated in the preceding article (analysis of development process and measures promoting care integration) to two innovative healthcare projects in Geneva. The first of these projects is a care network which has grown considerably in terms of the number of doctors and insured persons who have joined it since its foundation some fifteen years ago. Here, the emphasis is on revealing the dynamics underlying this development, as well as its impact on integration. The second project is a pluridisciplinary medical centre which is in the final stages of construction. In this case, the focus is on examining the characteristics of this initiative, the partners foreseen and the planned activities, as well as suggesting the possible components of a strategy that will promote cooperation and coordination. Prat Organ Soins. 2011;42(2):119-126
Improving chronic disease management – 2. Strategy
Huard P,Schaller P
Pratiques et Organisation des Soins , 2010,
Abstract: In the second article, “Improving chronic disease management – 2. Strategy”, the authors identify strategies that may help reduce the implementation difficulties described in the first article. The following points are successively discussed: – the authors first compare and contrast seemingly relevant measures that fail to produce the desired results and apparently difficult reforms that succeed (the British reform of 1991); – this description is followed by a demonstration of how local dynamic processes may cause necessary changes in the system and interfere with its overall inertia; – the preceding analyses are used to elaborate a strategy that promotes the development of field initiatives in the area of chronic disease management and their establishment as new references for the global system. The case of the Delta network in Geneva is used to illustrate this type of dynamics. Prat Organ Soins. 2010;41(3):247-255
On Classification of Integrable Davey-Stewartson Type Equations
Benoit Huard,Vladimir Novikov
Physics , 2013, DOI: 10.1088/1751-8113/46/27/275202
Abstract: This paper is devoted to the classification of integrable Davey-Stewartson type equations. A list of potentially deformable dispersionless systems is obtained through the requirement that such systems must be generated by a polynomial dispersionless Lax pair. A perturbative approach based on the method of hydrodynamic reductions is employed to recover the integrable systems along with their Lax pairs. Some of the found systems seem to be new.
Management of Anticoagulation for Portal Vein Thrombosis in Individuals with Cirrhosis: A Systematic Review
Geneviève Huard,Marc Bilodeau
International Journal of Hepatology , 2012, DOI: 10.1155/2012/672986
Abstract: Non-neoplastic portal vein thrombosis (PVT) is an increasingly recognized complication of liver cirrhosis. It is often diagnosed fortuitously and can be either partial or complete. The clinical significance of PVT is not obvious except in some situations such as when patients are on the waiting list for liver transplantation. The only known therapy is anticoagulation which has been shown to permit the disappearance of thrombosis and to prevent further extension. Anticoagulation is a challenging therapy in individuals with liver cirrhosis because of the well-recognized coagulation abnormalities observed in that setting and because of the increased risk of bleeding, especially from gastrointestinal tract caused by portal hypertension. We herein review the current knowledge on that topic in order to highlight the advantages and disadvantages of the currently proposed therapeutic attitudes in face of the diagnosis of PVT in individuals with cirrhosis.
Management of Anticoagulation for Portal Vein Thrombosis in Individuals with Cirrhosis: A Systematic Review
Geneviève Huard,Marc Bilodeau
International Journal of Hepatology , 2012, DOI: 10.1155/2012/672986
Abstract: Non-neoplastic portal vein thrombosis (PVT) is an increasingly recognized complication of liver cirrhosis. It is often diagnosed fortuitously and can be either partial or complete. The clinical significance of PVT is not obvious except in some situations such as when patients are on the waiting list for liver transplantation. The only known therapy is anticoagulation which has been shown to permit the disappearance of thrombosis and to prevent further extension. Anticoagulation is a challenging therapy in individuals with liver cirrhosis because of the well-recognized coagulation abnormalities observed in that setting and because of the increased risk of bleeding, especially from gastrointestinal tract caused by portal hypertension. We herein review the current knowledge on that topic in order to highlight the advantages and disadvantages of the currently proposed therapeutic attitudes in face of the diagnosis of PVT in individuals with cirrhosis. 1. Introduction Nonneoplastic portal vein thrombosis (PVT) is encountered in 0.6 to 26% of individuals with liver cirrhosis [1–4]. The prevalence of PVT increases with the severity of liver disease, being 1% in individuals with compensated cirrhosis and up to 8–25% in candidates for liver transplantation [1, 3–5]. In individuals with cirrhosis, reduced blood flow velocity in the portal vein seems to be the most important local factor responsible for the development of PVT [3, 6]. Several clinical risk factors have been shown to be associated with PVT: they include thrombocytopenia, previous variceal hemorrhage, splenectomy, surgical portosystemic shunt, and endoscopic treatment of esophageal varices [4, 7]. However, instead of being causative, these factors are probably a reflection of the severity of portal hypertension, which is by itself an important risk factor for PVT [4]. More recently, the recognition of a procoagulant imbalance in individuals with advanced liver disease has also been put forward in explaining the development of PVT in this population [1–4, 8]. Indeed, it is now clear that individuals with cirrhosis have a decreased production of liver procoagulant factors (with the exception of factor VIII) and also a decreased production of anticoagulant factors. The resulting procoagulant imbalance can be demonstrated in particular through the partial resistance to the anticoagulant action of thrombomodulin (a potent activator of protein C). The resistance to thrombomodulin is probably related to the markedly increased plasma levels of factor VIII and the concomitant decrease in protein C levels seen
Conditional Symmetries and Riemann Invariants for Hyperbolic Systems of PDEs
Alfred Michel Grundland,Benoit Huard
Physics , 2007,
Abstract: This paper contains an analysis of rank-k solutions in terms of Riemann invariants, obtained from interrelations between two concepts, that of the symmetry reduction method and of the generalized method of characteristics for first order quasilinear hyperbolic systems of PDEs in many dimensions. A variant of the conditional symmetry method for obtaining this type of solutions is proposed. A Lie module of vector fields, which are symmetries of an overdetermined system defined by the initial system of equations and certain first order differential constraints, is constructed. It is shown that this overdetermined system admits rank-k solutions expressible in terms of Riemann invariants. Finally, examples of applications of the proposed approach to the fluid dynamics equations in (k+1) dimensions are discussed in detail. Several new soliton-like solutions (among them kinks, bumps and multiple wave solutions) have been obtained.
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