Linearized supergravity from Matrix theory

We show that the linearized supergravity potential between two objects arising from the exchange of quanta with zero longitudinal momentum is reproduced to all orders in 1/r by terms in the one-loop Matrix theory potential. The essential ingredient in the proof is the identification of the Matrix theory quantities corresponding to moments of the stress tensor and membrane current. We also point out that finite-N Matrix theory violates the equivalence principle.Comment: 13 pages, LaTex, v2: additional comments mostly in section

Mathematics Professional Development Workshop for Middle School Teachers: Concept Versus Memorization

This article includes professional development topics for middle school mathematics and science teachers from two week-long Urban Teacher Institutes. These Institutes were held at J. Sargeant Reynolds Community College (JSRCC) and its partner institution, Virginia Commonwealth University (VCU), during the summers of 2007 and 2008, and were supported by a grant obtained by Dr. Harriet Morrison (JSRCC). Co-author Dr. Dewey Taylor directed the 2007 workshop, and both authors served as faculty leaders in both workshops. The workshops focused on teaching in an urban environment and community mapping (understanding the details of a certain locale to make the teacher more knowledgeable about the environments of both the students and the schools). The community mapping aspect of the workshops was led by Dr. Shirley Key of the University of Memphis. They featured content teaching and applications led by VCU faculty in mathematics, physics, forensics, engineering, mathematics education, and science education. This article focuses on the mathematics professional development strand in the workshop which featured conceptual learning with graphing calculator support as an alternative to the memorization of formulas

New data on biogeography, classification and phylogeny of Рhysidae (Gastropoda: Hygrophila) = Новые данные биогеографии, классификации и филогении Рhysidae (Gastropoda: Hygrophila)

Physidae are a family of freshwater pulmonate gastropods with about 90-100 named species, newly divided among 23 genera in seven tribes and four clades. Morphological studies resulted in discovery of many new characters, some of them progressive, yielding criteria for primitive versus advanced states. Thus it is possible to assert that primitive groups are concentrated on the Pacific coast from Mexico to Costa Rica, and to trace the spread of lineages from this region to other parts of the world

A curvilinear snake arm robot with gripper-axis fibre-optic image processor feedback

The official version of this article can be found at the link below.A curvilinear robot constructed from a number of modular flexible sections of fixed length and diameter but independently controlled radius and direction of curvature has been equipped with an optical fibre image guide transmitting images from between the gripper jaws to the remote TV camera of Microvision-100, a microcomputer controlled real-time DMA-based vision System that is easily trained to recognise the shape, position and orientation of components. The gripper position and orientation is controlled by feedback from the vision System, the action taken depending on component recognition and inspection for defects. Redundant degrees of freedom enable the curvilinear robot to avoid obstacles and work in confined spaces.The research programme described in this paper is supported by the U.K. Science and Engineering Research Council

An associated solvent theory of polymer solutions

Association model theory for thermodynamic properties of nonpolar polymer mixtures with polar solven

Teleprinter uses thermal printing technique

Alphameric/facsimile printer receives serial digital data in the form of a specified number of bits per group and prints it on thermally sensitive paper. A solid state shift-register memorizes the incoming serial digital data

Optimizing Ethanol Production in North Dakota

A spatial equilibrium model based on a non-linear mathematical programming algorithm was developed to determine the optimal number, location, and size of cellulose ethanol plants for North Dakota. The objective function of the model is to minimize processing cost of biomass for ethanol and the transportation cost of shipping biomass to processing plants and ethanol to blending facilities. A heuristic approach, combined with a spatial equilibrium model, was used to determine the optimal number, location and size of biomass processing plants.Cellulosic ethanol, biomass, mathematical programming, heuristic, production costs, Agribusiness,

2010 Outlook of the U.S. and World Sugar Markets, 2009-2019

This report evaluates the U.S. and world sugar markets for 2009-2019 using the Global Sugar Policy Simulation Model. This analysis is based on assumptions about general economic conditions, agricultural policies, population growth, weather conditions, and technological changes. Both the U.S. and world sugar economies are predicted to remain stable over the next ten years in spite of the 2007-08 increase in world oil prices. That increase in oil price caused an increase in the conversion of sugar into ethanol in Brazil, while other exporting countries increased their production of sugar in response to higher sugar prices. Sugar prices remained strong in 2009 as the world’s economies recover slowly from the recession. World demand for sugar is expected to grow at a similar rate to world supply, resulting in Caribbean sugar prices remaining near the 16.0-19.0 cents/lb range throughout the forecast period. The U.S. wholesale price of sugar is projected to increase from 33.72 cents/lb in 2009 to 36.19 cents/lb in 2019, if Brazil continues to convert sugar into ethanol. It is projected that Mexico would be able to export 483 thousand metric tons of sugar to the United States by 2019. World trade volumes of sugar are expected to increase throughout the forecast period.sugar, production, exports, consumption, ending stocks, Agribusiness,

2009 Outlook of the U.S. and World Sugar Markets, 2008-2018

This report evaluates the U.S. and world sugar markets for 2008-2018 using the Global Sugar Policy Simulation Model. This analysis is based on assumptions about general economic conditions, agricultural policies, population growth, weather conditions, and technological changes. Both the U.S. and world sugar economies are predicted to remain stable over the next ten years in spite of the 2007-08 surge in world oil prices. That increase in price caused an increase in the conversion of sugar into ethanol in Brazil, while other exporting countries increased their production in response to those higher prices. Sugar prices returned to normal levels in 2008. World demand for sugar is expected to grow at a similar rate to world supply, resulting in Carribean sugar prices remaining near the 13.0 -14.0 cents/lb range throughout the forecast period. The U.S. wholesale price of sugar is projected to decrease slightly from 28.60 cents/lb in 2008 to 28.40 cents/lb in 2018, if Brazil continues to convert sugar into ethanol. It is projected that Mexico will be able to export 119 thousand metric tons of sugar to the United States by 2018. World trade volumes of sugar are expected to increase throughout the forecast period.sugar, production, exports, consumption, ending stocks, Crop Production/Industries, Demand and Price Analysis, International Relations/Trade,