2,698 research outputs found
Reseñas
No full textW. F. BYNUM ; Caroline OVERY (eds.), The Beast in the Mosquito : the correspondence of Ronald Ross & Patrick Manso
Reseñas
No full textW. F. BYNUM ; Caroline OVERY (eds.), The Beast in the Mosquito : the correspondence of Ronald Ross & Patrick Manso
A Volumetric Proof of the Log-Concavity of the Characteristic Polynomial of Matroids
No full textThis thesis presents a novel proof of the Heron–Rota–Welsh conjecture using a volume theoretic approach. Originating in the 1950's, the conjecture proposes that the coefficients of the characteristic polynomial of a matroid exhibit the property of log-concavity. A complete proof for all matroids was found only in 2018, when Jun Huh, in collaboration with Karim Adiprasito and Eric Katz, achieved this milestone by developing the theory of combinatorial Hodge theory. We review the link between the combinatorial data of matroids, algebraic objects known as Chow rings, and geometric objects called Bergman fans, and then outline the recent work of Dustin Ross, Anastasia Nathanson, Lauren Nowak, and the author on the theory of normal complexes of fans and their volumetric properties. Our main result stems from showing that the Bergman fans of matroids meet criteria such that the (extended) mixed volumes of their normal complexes obey the Alexandrov–Fenchel inequality, yielding log-concave sequences. We hope this demonstrates that the theory of normal complexes is a tool able to tackle modern problems in mathematics
The Social-Environmental Justice of Groundwater Management
No full textPatrick MJ, Greco F, Hepworth N, Connell D & Conrad J. (In Press in 2014) The Social-Environmental Justice of Groundwater Management. In: Jakeman T, Barreteau O, Hunt R, Rinaudo J-D, & Ross A. (Eds) Integrated Groundwater Management. Springer
Feature Story: Honorary Degree Recipients Announced
No full textThe University of Regina is bestowing the highest honour it offers to longtime public servant Patrick G. Binns; dedicated patron of the arts, education and corporate governance, Adrian Burns; and, Dr. Ross King, bestselling author. The three are set to receive honorary degrees at the University of Regina's 38th annual spring convocation to be held on June 6-8, 2012, at the Conexus Arts Centre in Regina, beginning at 2:00 p.m. daily. The honorary degrees will be conferred by University Chancellor Dr. William F. Ready, Q.C.Staffn
Ross ice shelf icequakes associated with ocean gravity wave activity
No full textAuthor Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 46(15), (2019): 8893-8902, doi:10.1029/2019GL084123.Gravity waves impacting ice shelves illicit a suite of responses that can affect ice shelf integrity. Broadband seismometers deployed on the Ross Ice Shelf, complemented by a near‐icefront seafloor hydrophone, establish the association of strong icequake activity with ocean gravity wave amplitudes (AG) below 0.04 Hz. The Ross Ice Shelf‐front seismic vertical displacement amplitudes (ASV) are well correlated with AG, allowing estimating the frequency‐dependent transfer function from gravity wave amplitude to icefront vertical displacement amplitude (TGSV(f)). TGSV(f) is 0.6–0.7 at 0.001–0.01 Hz but decreases rapidly at higher frequencies. Seismicity of strong icequakes exhibits spatial and seasonal associations with different gravity wave frequency bands, with the strongest icequakes observed at the icefront primarily during the austral summer when sea ice is minimal and swell impacts are strongest.Bromirski, Gerstoft, and Chen were supported by NSF grant PLR‐1246151. Bromirski also received support from NSF grant OPP‐1744856 and CAL‐DPR‐C1670002. Stephen, Wiens, Aster, and Nyblade were supported under NSF grants PLR‐1246416, 1142518, 1141916, and 1142126, respectively. Lee and Yun were support by a research grant from the Korean Ministry of Oceans and Fisheries (KIMST20190361; PM19020). Seismic instruments and on‐ice support were provided by the Incorporated Research Institutions for Seismology (IRIS) through the PASSCAL Instrument Center at New Mexico Tech. The RIS and KPDR seismic data are archived at the IRIS Data Management Center, http://ds.iris.edu/ds/nodes/dmc/, with network codes XH and KP, respectively. The facilities of the IRIS Consortium are supported by the National Science Foundation under Cooperative Agreement EAR‐1261681 and the DOE National Nuclear Security Administration. We thank Patrick Shore, Michael Baker, Cai Chen, Robert Anthony, Reinhard Flick, Jerry Wanetick, Weisen Shen, Tsitsi Madziwa Nussinov, and Laura Stevens for their help with field operations. Logistical support from the U.S. Antarctica Program and staff at McMurdo Station was critical and is much appreciated.2020-02-0
Bone remodelling inflammatory arthritis
No full textThe inflammatory arthropathies that include rheumatoid arthritis, the seronegative spondyloarthropathies and systemic lupus erythematosus are characterised by marked alterations in the architecture and structural integrity of peri-articular bone; however, the pattern and natural history of the skeletal changes differs in these conditions. In part, this can be attributed to differences in the primary anatomical site of the inflammation, but also there is evidence that there are differences in the biological properties and products produced by inflammatory tissues. This review will focus on recent advances in the understanding of the cellular and molecular mechanisms that contribute to the differential pattern of articular bone remodelling in these prototypical inflammatory forms of arthritis.Steven R. Goldring, P. Edward Purdue, Tania N. Crotti, Zhenxin Shen, Merrilee R. Flannery, Nikolaus B. Binder, F. Patrick Ross and Kevin P. McHug
The macroeconomics of the public sector deficit : the case of Morocco
No full textThis paper tries to uncover the reasons underlying the performance of the Moroccan economy. The author argues that wage moderation and judicious monetary policies were instrumental in restraining inflation. With one brief exception in 1983, monetary authorities remained firmly committed to eschew any inflationary financing of the budget deficit. This strategy could only succeed however because of the wide ranging system of credit and monetary regulations which worked to channel domestic funds toward the Treasury at relatively low costs. The prospects for the continuation of such a strategy are not favourable however. As far as the growth performance is concerned, it appears that it can be attributed to an outstanding export response to the new trade regime on the one hand and a set of favourable supply shocks, including a string of recordagricultural harvests and the collapse of real oil prices, on the other. The paper studies the evolution of the budget and its different components and argues that the reluctance by Morocco's policy makers to monetize existing budget deficits is well explained by the sharply unfavourable trade-offs between higher monetization and inflation existing in Morocco. It analyzes the implications that continuing budgetary disequilibria has on investment and saving decisions and finds that such implications may be substantial, even though they may not work their way exclusively through traditional interest rates channels.Economic Theory&Research,Environmental Economics&Policies,Banks&Banking Reform,Public Sector Economics&Finance,Financial Intermediation
Reforming finance in transitional socialist economies : avoiding the path from shell money to shell games
No full textIn the late 1980s, transitional socialist economies (TSEs) in Central and Eastern Europe were only somewhat more sophisticated than shell money systems: savings books or currency had to be used for most transactions and there was no risk assessment, information monitoring and acquisition, or portfolio management. The TSEs have moved toward a two-tiered banking system but they lag in the development of competitive, market-based financial systems. In several TSEs the financial system seems to be part of a shell game to hide the losses of the real economy. The authors argue that rapid, successful economic reform requires putting the shell game to an end. They review several contentious issues of financial reform in the TSEs, especially issues involving macrofinance, corporate finance, the internal debt problems, and the need to build efficient banks. The authors contend that the banks should be"cleaned up"when they are privatized, to prevent the quick reemergence of debt problems. They believe that either of the proposed alternatives for shaping financial systems in the TSEs - very highly capitalized banking or narrow banking - would minimize the need for future support. Either alternative would reduce leverage in the TSEs and provide more financial stability. But taking concerns about moral hazard to an extreme - prohibiting debt finance - could starve new firms for credit and limit economic growth.Economic Theory&Research,Financial Crisis Management&Restructuring,Environmental Economics&Policies,Banks&Banking Reform,Financial Intermediation
An atheoretic evaluation of success in structural adjustment
No full textThe author presents and implements a methodology for assessing the success of structural adjustment based on a"fixed effect"method. He examines data for 75 countries over 11 years. Performance indicators include measures of inflation, economic growth, external balance, and physical investment. He measures government policies in terms of spending, trade regime, financial deepening, and real exchange rate policy. The empirical estimates he obtains suggest that ranking countries by adjusted economic performance yields significantly different results than ranking them by historical performance. Further, countries following a prescription of relatively low government spending, deep financial markets, and outward orientation in trade policy performed significantly better than those that did not. This prescription was correlated significantly with more rapid economic growth, current accounts with lower deficits, expanded investment, and reduced inflation.Environmental Economics&Policies,Economic Theory&Research,Macroeconomic Management,Achieving Shared Growth,Economic Stabilization
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