334,067 research outputs found
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New species of Parmeliaceae (lichenized Ascomycotina) from South America
The species Flavoparmelia quichuaensis Elix & T. H. Nash, Hypotrachyna divaricatica Elix & T. H. Nash, Hypotrachyna goiasii Elix & Nash, Hypotrachyna hypoalectorialica Elix & T. H. Nash and Relicina xanthoparmeliformis Elix & T. H. Nash are described as new to science
Perturbational Blowup Solutions to the 2-Component Camassa-Holm Equations
In this article, we study the perturbational method to construct the
non-radially symmetric solutions of the compressible 2-component Camassa-Holm
equations. In detail, we first combine the substitutional method and the
separation method to construct a new class of analytical solutions for that
system. In fact, we perturb the linear velocity: u=c(t)x+b(t), and substitute
it into the system. Then, by comparing the coefficients of the polynomial, we
can deduce the functional differential equations involving
Additionally, we could apply the Hubble's
transformation c(t)={\dot{a}(3t)}/{a(3t)}, to simplify the ordinary
differential system involving . After proving the
global or local existences of the corresponding dynamical system, a new class
of analytical solutions is shown. And the corresponding solutions in radial
symmetry are also given. To determine that the solutions exist globally or blow
up, we just use the qualitative properties about the well-known Emden equation:
{array} [c]{c} {d^{2}/{dt^{2}}}a(3t)= {\xi}{a^{1/3}(3t)}, a(0)=a_{0}>0
,\dot{a}(0)=a_{1} {array} . Our solutions obtained by the perturbational
method, fully cover the previous known results in "M.W. Yuen,
\textit{Self-Similar Blowup Solutions to the 2-Component Camassa-Holm
Equations,}J. Math. Phys., \textbf{51} (2010) 093524, 14pp." by the separation
method.Comment: 12 page
[Review of] Frederick Hale. The Swedes in Wisconsin
The Swedes in Wisconsin, Frederick Hale concludes, were the \u27\u27invisible immigrants\u27 of nineteenth and early twentieth-century America, never accounting for more than two percent of the Wisconsin state population. Hale avoids promoting the Swedes and, instead, realistically presents them as a minor part of a major European immigration. Hale\u27s realism means his primary focus is on the fluctuation and integration which characterized the Wisconsin Swedish presence
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The environmental externalities of tobacco manufacturing: A review of tobacco industry reporting.
Growing research and public awareness of the environmental impacts of tobacco present an opportunity for environmental science and public health to work together. Various United Nations agencies share interests in mitigating the environmental costs of tobacco. Since 2000, transnational tobacco industry consolidation has accelerated, spotlighting the specific companies responsible for the environmental and human harms along the tobacco production chain. Simultaneously, corporate social responsibility norms have led the industry to disclose statistics on the environmental harms their business causes. Yet, independent and consistent reporting remain hurdles to accurately assessing tobacco's environmental impact. This article is the first to analyze publicly available industry data on tobacco manufacturing pollution. Tobacco's significant environmental impact suggests this industry should be included in environmental analyses as a driver of environmental degradation influencing climate change. Countries aiming to meet UN Sustainable Development Goals must act to reduce environmental harms caused by the tobacco industry
The Hale solar sector boundary
A Hale solar sector boundary is defined as the half (Northern Hemisphere or Southern Hemisphere) of a sector boundary in which the change of sector magnetic field polarity is the same as the change of polarity from a preceding spot to a following spot. Above a Hale sector boundary the green corona has maximum brightness, while above a non-Hale boundary the green corona has a minimum brightness. The Hale portion of a photospheric sector boundary tends to have maximum magnetic field strength, while the non-Hale portion has minimum field strength
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