Heated bimetal strip prevents damage of bearings by vibration

Strip of bimetal is shaped as split ring; when properly fabricated from thin sheet, width of strip increases when it is heated. When width of strip increases, outer races are forced apart, thus pressing balls tightly against inner races. Strip applies axial load to bearing, amount of load being function of temperature to which strip is heated

On uniform continuous dependence of solution of Cauchy problem on a parameter

Suppose that an $n$-dimensional Cauchy problem \frac{dx}{dt}=f(t,x,\mu) (t \in I, \mu \in M), x(t_0)=x^0 satisfies the conditions that guarantee existence, uniqueness and continuous dependence of solution x(t,t_0,\mu) on parameter \mu in an open set M. We show that if one additionally requires that family \{f(t,x,\cdot)\}_{(t,x)} is equicontinuous, then the dependence of solution x(t,t_0,\mu) on parameter \mu \in M is uniformly continuous. An analogous result for a linear n \times n-dimensional Cauchy problem \frac{dX}{dt}=A(t,\mu)X+\Phi(t,\mu) (t \in I, \mu \in M), X(t_0,\mu)=X^0(\mu) is valid under the assumption that the integrals \int_I\|A(t,\mu_1)-A(t,\mu_2)\|dt and \int_I \|\Phi(t,\mu_1)-\Phi(t,\mu_2)\|dt can be made smaller than any given constant (uniformly with respect to \mu_1, \mu_2 \in M) provided that \|\mu_1-\mu_2\| is sufficiently small

Electrostatically controlled heat shutter

A heat transfer assembly for conducting thermal energy is described. The assembly includes a hermetically sealed container enclosing a quantity of inert gas such as nitrogen. Two opposed walls of the container have high thermal conducting characteristics while the connecting walls have low thermal conducting characteristics. Electrodes are positioned adjacent to the high thermal conducing walls and biased relative to the conducting walls to a corona potential for creating an ionic gas wind which must contact the conducting walls to be neutralized. The contact of the gas molecules permits the maximum thermal energy transfer between the walls. Baffles can be positioned adjacent to the electrodes to regulate gas flow between the high thermal conducting surfaces

Distributions with dynamic test functions and multiplication by discontinuous functions

As follows from the Schwartz Impossibility Theorem, multiplication of two distributions is in general impossible. Nevertheless, often one needs to multiply a distribution by a discontinuous function, not by an arbitrary distribution. In the present paper we construct a space of distributions where the general operation of multiplication by a discontinuous function is defined, continuous, commutative, associative and for which the Leibniz product rule holds. In the new space of distributions, the classical delta-function $\delta_\tau$ extends to a family of delta-functions $\delta_\tau^\alpha$, dependent on the \textit{shape} $\alpha$. We show that the various known definitions of the product of the Heaviside function and the delta-function in the classical space of distributions $\mathcal D'$ become particular cases of the multiplication in the new space of distributions, and provide the applications of the new space of distributions to the ordinary differential equations which arise in optimal control theory. Also, we compare our approach of the Schwartz distribution theory with the approach of the Colombeau generalized functions algebra, where the general operation of multiplication of two distributions is defined

Shear flow-interchange instability in nightside magnetotail causes auroral beads as a signature of substorm onset

A geometric wedge model of the near-earth nightside plasma sheet is used to derive a wave equation for low frequency shear flow-interchange waves which transmit $\vec{E} \times \vec{B}$ sheared zonal flows along magnetic flux tubes towards the ionosphere. Discrepancies with the wave equation result used in Kalmoni et al. (2015) for shear flow-ballooning instability are discussed. The shear flow-interchange instability appears to be responsible for substorm onset. The wedge wave equation is used to compute rough expressions for dispersion relations and local growth rates in the midnight region of the nightside magnetotail where the instability develops, forming the auroral beads characteristic of geomagnetic substorm onset. Stability analysis for the shear flow-interchange modes demonstrates that nonlinear analysis is necessary for quantitatively accurate results and determines the spatial scale on which the instability varies

Contra Epstein, Good Explanations Predict

Epstein has argued that an explanation\'s capacity to make predictions should play a minor role in its evaluation . This view contradicts centuries of scientific practice and, at least, decades of philosophy of science. We argue that the view is not only unfounded but seems to arise from a mistaken fear that ABM models are in need of defense against the criticism that they don\'t necessarily forecast events in the natural or social world.ABM, Agent Based Model, Modeling, Prediction, Explanation, Philosophy of Science

The SAVI Community Information System

poster abstractThe SAVI Community Information System (www.savi.org) is a dynamic and interactive resource for local, spatially-enabled data and information about Central Indiana. It provides local data about the social, economic, and physical conditions of neighborhoods, townships, and counties, and other geographic areas such as school districts which is then summarized into community profiles and allows users to view and analyze detailed data in interactive maps, charts, and tables

Participação como marco de apoio à inclusão cultural e à justiça ambiental

In 1989, the United Nations Convention on the Rights of the Child lay the groundwork for children´s access to education, to play, to express themselves, and to have their views heard. This article explores participation as a supportive framework for democracy, environmental justice, and cultural inclusion. It presents methods that have fostered cultural inclusion and connection to nature, by analyzing three projects in Boulder, Colorado and Salinas, California. Participatory methods included nicho boxes, photovoice, and garden art. These cases demonstrate how children’s rights to participation, through nature and the arts, help create just sustainabilities through the creation of culturally relevant practices that bridge social and environmental justiceEn 1989, la Convención de las Naciones Unidas sobre los Derechos del Niño establece una base para que los niños tengan acceso a la educación, a jugar, a expresarse y tener sus opiniones oír. Este artículo explora la participación como un marco de apoyo para la democracia, la justicia ambiental y la inclusión cultural. Presenta métodos que han fomentado la inclusión cultural y la conexión con la naturaleza, analizando tres proyectos en Boulder, Colorado y Salinas, California. Los métodos participativos incluyeron cajas nicho, photovoice, y arte del jardín. Estos casos demuestran cómo los derechos de los niños a la participación, a través de la naturaleza y las artes, ayudan a crear sostenibilidad justicia, a través de la creación de prácticas culturalmente relevantes que contribuyen a la justicia social y ambientalEm 1989, a Convenção das Nações Unidas sobre os Direitos da Criança proporcionou uma base para que as crianças tivessem acesso à educação, para jogar, para se expressar e para que as suas opiniões fossem ouvidas. Este artigo explora a participação como um quadro de apoio para a democracia, a justiça ambiental e inclusão cultural. São apresentados métodos que promoveram a inclusão cultural e a conexão com a natureza, analisando três projetos em Boulder, Colorado e Salinas, Califórnia. Os métodos participativos incluídos nicho, photovoice e jardinagem. Estes casos mostram como os direitos das crianças à participação, através da natureza e das artes, ajuda a criar sustentabilidade através da criação de práticas culturalmente relevantes que contribuem para uma justiça social e ambienta