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

Forecasting Intraday Time Series with Multiple Seasonal Cycles Using Parsimonious Seasonal Exponential Smoothing

This paper concerns the forecasting of seasonal intraday time series. An extension of Holt-Winters exponential smoothing has been proposed that smoothes an intraday cycle and an intraweek cycle. A recently proposed exponential smoothing method involves smoothing a different intraday cycle for each distinct type of day of the week. Similar days are allocated identical intraday cycles. A limitation is that the method allows only whole days to be treated as identical. We introduce an exponential smoothing formulation that allows parts of different days of the week to be treated as identical. The result is a method that involves the smoothing and initialisation of fewer terms than the other two exponential smoothing methods. We evaluate forecasting up to a day ahead using two empirical studies. For electricity load data, the new method compares well with a range of alternatives. The second study involves a series of arrivals at a call centre that is open for a shorter duration at the weekends than on weekdays. By contrast with the previously proposed exponential smoothing methods, our new method can model in a straightforward way this situation, where the number of periods on each day of the week is not the same.Exponential smoothing; Intraday data; Electricity load; Call centre arrivals.

1999 OUTLOOK OF THE U.S. AND WORLD SUGAR MARKETS

This report evaluates the U.S. and world sugar markets for 1998-2008 by using the World 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 be strong for the next ten years. World demand for sugar is expected to grow faster than world supply, gradually increasing sugar prices. World trade volumes of sugar are expected to expand.Sugar, Production, Exports, Consumption, Ending Stocks, Agricultural and Food Policy, Marketing, International Relations/Trade,

ECONOMIC ANALYSIS OF THE FARMERS UNION FARM BILL PROPOSAL

The lack of a safety net for farm income in the FAIR Act has become evident in recent years because of the necessity of federal legislation each year, 1998-2001, to support farm income. In recent years, U.S. agriculture has experienced a rapid loss of mid-size family farms. The number of small-size farms has increased substantially and the number of large farms has increased slowly. The Farmers Union Farm Bill Proposal is a targeted plan which utilizes varying loan rates based on the USDA's full cost of production for program crops and a Farmer Owned Reserve (FOR). The proposed loan rates decrease as the value of the crop loans increase. The FOR is targeted towards a Limited Renewable Energy Reserve and a Humanitarian Assistance Reserve. The objectives of the study were to develop a distribution of farms in North Dakota by size and estimate the statewide government cost of the Farmers Union Proposal under the baseline and Farmers Union price scenario and compare it to the continuation of the FAIR Act.Farm Bill, Targeting, Government Agricultural Spending, North Dakota Representative Farms, Agricultural and Food Policy,