Short-range ultrasonic communications in air using quadrature modulation

A study has been undertaken of ultrasonic communications methods in air, using a quadrature modulation method. Simulations were first performed to establish the likely performance of quadrature phase shift keying over the limited bandwidth available in an ultrasonic system. Quadrature phase shift keying modulation was then implemented within an experimental communication system, using capacitive ultrasonic sources and receivers. The results show that such a system is feasible in principle for communications over distances of several meters, using frequencies in the 200 to 400 kHz range

IRRIGATION WATER RATE REFORM AND ENDOGENOUS TECHNOLOGICAL CHANGE

Research and Development/Tech Change/Emerging Technologies, Resource /Energy Economics and Policy,

Broiler Farms' Organization, Management, and Performance

This study provides a comprehensive view of the organization, management, and financial performance of U.S. broiler farms. Using data from USDA's Agricultural Resource Management Study (ARMS, formerly known as the Farm Costs and Returns Survey), we examine farm size, financial structure, household income, management practices, and spousal participation in decision-making. We compare broiler operations with other farming enterprises and their earnings with that of the average U.S. household. Because most of the 7 billion broilers produced in the United States in 1995 were raised under contract, we also explore the use of contracts and the effects of contracting on the broiler sector.contracting, broilers, poultry, farm characteristics, farm income, farm operator characteristics, risk management strategies, Livestock Production/Industries,

Two-year study of alum sludge application to corn and soybean farmland

"ISWS/RI-113/90"--Cover.Includes bibliographical references (p. 37).Enumeration continues through succeeding title

Tackling concentrated worklessness: integrating governance and policy across and within spatial scales

Spatial concentrations of worklessness remained a key characteristic of labour markets in advanced industrial economies, even during the period of decline in aggregate levels of unemployment and economic inactivity evident from the late 1990s to the economic downturn in 2008. The failure of certain localities to benefit from wider improvements in regional and national labour markets points to a lack of effectiveness in adopted policy approaches, not least in relation to the governance arrangements and policy delivery mechanisms that seek to integrate residents of deprived areas into wider local labour markets. Through analysis of practice in the British context, we explore the difficulties of integrating economic and social policy agendas within and across spatial scales to tackle problems of concentrated worklessness. We present analysis of a number of selected case studies aimed at reducing localised worklessness and identify the possibilities and constraints for effective action given existing governance arrangements and policy priorities to promote economic competitiveness and inclusion

Gold(I)-Catalysed Direct Thioetherifications Using Allylic Alcohols: an Experimental and Computational Study

A gold(I)-catalysed direct thioetherification reaction between allylic alcohols and thiols is presented. The reaction is generally highly regioselective (S(N)2′). This dehydrative allylation procedure is very mild and atom economical, producing only water as the by-product and avoiding any unnecessary waste/steps associated with installing a leaving or activating group on the substrate. Computational studies are presented to gain insight into the mechanism of the reaction. Calculations indicate that the regioselectivity is under equilibrium control and is ultimately dictated by the thermodynamic stability of the products

Geology of the Lower Paleozoic Rocks in the Boundary Mountain Anticlinorium

Guidebook for field trips in the Rangeley Lakes - Dead River Basin region, western Maine: 62nd annual meeting October 2, 3, and 4, 1970: Trip A-

The State of the Parties (Seventh Edition)

Continuing a three-decade tradition, The State of the Parties 7th edition brings together leading experts to evaluate change and continuity in American electoral politics. Political parties in America have never been more contentious and divided than they are right now. Even splits within the parties themselves have the power to elevate relatively unknown candidates to power and topple established incumbents. With sections devoted to polarization and the electorate, polarization and political elites, tea party politics, super PACS, and partisan resources and partisan activities, the contributors survey the American political landscape. They pay special attention to polarization between and within the parties in the aftermath of the 2012 election, demographic changes to America\u27s political parties, the effects of new media and campaign finance laws on national and local electoral results, the Tea Party\u27s rise and, as always, the implications of all these factors on future policymaking and electoral prospects. The State of the Parties 7th edition offers an indispensable guide to American politics for scholars, students, and practitioners.https://ideaexchange.uakron.edu/state_of_the_parties7/1000/thumbnail.jp