102,319 research outputs found
Who leaves, who moves in? The impact of positive and negative income shocks on migration in Senegal
No full textUsing a recent household survey conducted in Senegal, I examine the impact of negative and positive income shocks on departures from and entries in the household. I focus on differences in responses to shocks across the urban and rural sectors as well as age and gender groups. Striking differences emerge. Positive shocks increase entries of young girls and adult females in rural areas while they attract adult males in urban areas. Negative shocks decrease the arrivals of boys in urban areas while, in rural areas, they only impact the entries of adult males. Migration only increases after negative shocks, for prime-age adults wherever they reside and for adult children of urban household heads. In addition to migration, I examine private transfers. They show much less contrast between urban and rural areas but a sharp contrast between males and females. Adult males increase the amount of transfers they send after positive shocks and receive more transfers after negative shocks, wherever they reside, pointing towards the use of transfers as insurance. Females send and receive on average more transfers than males. However, negative shocks do not increase the amount of transfers they receive. Negative shocks only reduce transfers given by older rural females. Overall, both in terms of movements and transfers, individuals benefit very differently from their external relations, depending on their place of residence, gender and age. Given the heterogenous responses of migration and private transfers to income shocks, identical public policies may have very different effects for urban and rural areas and across age and gender.geographic mobility ; transfers ; risk ; rural-urban differences ; Senegal
The ABLA-BOX An In Vitro Module of Hybrid Atrial Fibrillation Ablation
No full textObjective: We present the first testing study on the ABLA-BOX, a new in vitro module of hybrid atrial fibrillation ablation. Methods: ABLA-BOX consists of two chambers that mimic the epicardial and endocardial sides of the heart. The septum between chambers provides catheter access on both sites of the cardiac tissue. A circuit, filled with freshly obtained porcine blood, including a pump, an oxygenator, and a heating device, circulate the blood inside the system. Left atrial fresh tissue is mounted on a tissue holder and magnetically fixed. Epicardial and endocardial catheters are fixed on the catheter holders and blocked with the locker knob. The system allows control of ablation force, flow rate, temperature, and flow pattern. Results: Epicardial contact force of 100 g and endocardial force of 30 g resulted in larger lesion volumes (P <0.001), areas (P <0.001), and lesion diameters (P = 0.03 and P = 0.008), than the combination of 100/20 g. In addition, with a flow rate of 5 L/min, lesion volumes (P = 0.02), areas (P <0.001), and diameters (both, P G 0.001) were significantly larger in comparison with those of 3 L/min. Furthermore, dimensions (both, P <0.001), volume (P <0.001), and area (P <0.001) of the lesions at a circulating blood temperature of 38.0-C were larger than with a lower blood temperature (36.0-C). Finally, ablations made under stable flow pattern resulted in greater lesion diameters (P = 0.04 and P = 0.03) as well as larger volumes (P = 0.02) and areas (P = 0.03) than under turbulent-like flow reproduced with the system rotor set to 400 rpm. Conclusions: The ABLA-BOX allowed easy hybrid ablation with different setups, which can provide cardiologists and cardiac surgeons with reliable and more valuable insights
On the L∞ structure of Poisson gauge theory
No full textThe Poisson gauge theory is a semi-classical limit of full non-commutative gauge theory. In this work we construct an L ∞ full algebra which governs both the action of gauge symmetries and the dynamics of the Poisson gauge theory. We derive the minimal set of non-vanishing l-brackets and prove that they satisfy the corresponding homotopy relations. On the one hand, it provides new explicit non-trivial examples of L∞ algebras. On the other hand, it can be used as a starting point for bootstrapping the full non-commutative gauge theory. The first few brackets of such a theory are constructed explicitly in the text. In addition we show that the derivation properties of l-brackets on L ∞ full with respect to the truncated product on the exterior algebra are satisfied only for the canonical non-commutativity. In general, L ∞ full does not have a structure of P∞ algebra
Multiplicity and nondegeneracy of positive solutions to quasilinear equations on compact Riemannian manifolds
No full textWe consider a compact, connected, orientable, boundaryless Riemannian manifold (M, g) of class C∞ where g denotes the metric tensor. Let n = dim M ≥ 3. Using Morse techniques, we prove the existence of nonconstant solutions u H1,p(M) to the quasilinear problem (P-epsilon) left{{egin{array}{@{}l@{}} -epsilon^p Delta-{p,g} u +u^{p-1}=u^{q-1}, \u>0,end{array}}
ight for ε > 0 small enough, where 2 ≤ p < n, p < q < p∗, p∗= np/(n - p) and is the p-laplacian associated to g of u (note that Δ2,g = Δg) and denotes the Poincaré polynomial of M. We also establish results of genericity of nondegenerate solutions for the quasilinear elliptic problem (Pε)
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
ROBUST G-MUSIC
No full textABSTRACT An improved MUSIC algorithm for direction-of-arrival estimation is introduced that accounts both for large array sizes N comparatively with the number of independent observations n and for the impulsiveness of the background environment (e.g., presence of outliers in the observations). This method derives from the spiked G-MUSIC algorithm proposed i
The Right to Strike under the United States Constitution: Theory, Practice, and Possible Implications for Canada
No full textAnswering critics of the Canadian Supreme Court's judgment in B.C. Health, the author argues that the Court laid the foundation for a principled and durable doctrine protecting constitutional labour rights, one that goes directly to the heart of the matter — the inequality of workers’ power in the employment relation. In the author’s view, two paths could lead from B.C. Health to the recognition of Charter protec- tion for a right to strike: one that treats the right as an accessory to col- lective bargaining, and one that upholds the right directly on the basis of the Charter values of equality and participation. The author supports the latter approach, contending that constitutional rights should be defined in relation to fundamental values, in a way that is not contingent on time-bound or fact-sensitive assessments about the role of strikes within a particular collective bargaining regime. Although a Charter right to strike may involve the courts in difficult choices about when to defer to legislative policy decisions, and courts may lack the institutional capac- ity to deal effectively with labour law issues, the author points out that judges can look to ILO standards for expert guidance. Noting that the U.S. experience in this area might be of considerable use to Canadians, the author concludes by providing an overview of American case law concerning a constitutional right to strike.Peer reviewe
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