The Ursinus Weekly, November 21, 1902

Immensee • Tuesday Night Club: Schiller and Goethe • Football • Magazine articles • Mr. Gristock dines the varsity • Society echoes • Reverend J. Monroe Stick • YMCAhttps://digitalcommons.ursinus.edu/weekly/3064/thumbnail.jp

On the meaning of feedback parameter, transient climate response, and the greenhouse effect: Basic considerations and the discussion of uncertainties

In this paper we discuss the meaning of feedback parameter, greenhouse effect and transient climate response usually related to the globally averaged energy balance model of Schneider and Mass. After scrutinizing this model and the corresponding planetary radiation balance we state that (a) the this globally averaged energy balance model is flawed by unsuitable physical considerations, (b) the planetary radiation balance for an Earth in the absence of an atmosphere is fraught by the inappropriate assumption of a uniform surface temperature, the so-called radiative equilibrium temperature of about 255 K, and (c) the effect of the radiative anthropogenic forcing, considered as a perturbation to the natural system, is much smaller than the uncertainty involved in the solution of the model of Schneider and Mass. This uncertainty is mainly related to the empirical constants suggested by various authors and used for predicting the emission of infrared radiation by the Earth's skin. Furthermore, after inserting the absorption of solar radiation by atmospheric constituents and the exchange of sensible and latent heat between the Earth and the atmosphere into the model of Schneider and Mass the surface temperatures become appreciably lesser than the radiative equilibrium temperature. Moreover, neither the model of Schneider and Mass nor the Dines-type two-layer energy balance model for the Earth-atmosphere system, both contain the planetary radiation balance for an Earth in the absence of an atmosphere as an asymptotic solution, do not provide evidence for the existence of the so-called atmospheric greenhouse effect if realistic empirical data are used.Comment: 69 pages, 3 tables and 16 figure

Finding Freire: Punk, praxis and the quest for spirituality in Krishnacore

Building upon earlier research, this paper unpacks the complex relationship between punk and Krishna Consciousness, in this instance through the lens of Paulo Freire’s notion of praxis. Here, the intersection between punk, the Hare Krishna movement and the corresponding relationship between auto-didacticism and spirituality are examined as a means of interrogating subcultural participation and the hegemonic dominance of the anti-religious sentiment within punk. Freire’s approach is examined within the context of this relationship, specifically regarding the inquisi-tiveness of the individual as they begin the process of engaging with Krishna Consciousness and spirituality, especially from the standpoint of punk. The importance here lies in the learning pro-cess being in a state of flux, where the continual re-creation of knowledge and inquiry becomes a means of consolidating the dialectical relationship between the self and the world around it. Here, punk becomes a valuable space in which to discover new ideas, a means of developing an aesthetic and subcultural/religious/spiritual membership within a framework of auto-didacticism; of illu-minating the dialectical, hermeneutic relationship between consciousness and the world around us, central to Freire’s concept of praxis

Nutritional Ecology: A First Vegetarian Spider

SummaryMutualisms are ubiquitous in nature and equally commonplace is their exploitation. A well-known mutualism has been found to be exploited from a surprising source: the first described vegetarian spider dines on trophic structures produced by acacia trees to reward their mutualistic protective ants

S-Lemma with Equality and Its Applications

Let $f(x)=x^TAx+2a^Tx+c$ and $h(x)=x^TBx+2b^Tx+d$ be two quadratic functions having symmetric matrices $A$ and $B$. The S-lemma with equality asks when the unsolvability of the system $f(x)<0, h(x)=0$ implies the existence of a real number $\mu$ such that $f(x) + \mu h(x)\ge0, ~\forall x\in \mathbb{R}^n$. The problem is much harder than the inequality version which asserts that, under Slater condition, $f(x)<0, h(x)\le0$ is unsolvable if and only if $f(x) + \mu h(x)\ge0, ~\forall x\in \mathbb{R}^n$ for some $\mu\ge0$. In this paper, we show that the S-lemma with equality does not hold only when the matrix $A$ has exactly one negative eigenvalue and $h(x)$ is a non-constant linear function ($B=0, b\not=0$). As an application, we can globally solve $\inf\{f(x)\vert h(x)=0\}$ as well as the two-sided generalized trust region subproblem $\inf\{f(x)\vert l\le h(x)\le u\}$ without any condition. Moreover, the convexity of the joint numerical range $\{(f(x), h_1(x),\ldots, h_p(x)):~x\in\Bbb R^n\}$ where $f$ is a (possibly non-convex) quadratic function and $h_1(x),\ldots,h_p(x)$ are affine functions can be characterized using the newly developed S-lemma with equality.Comment: 34 page