5,068 research outputs found

    Pilgrim

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    Study of high speed complex number algorithms

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    A method of evaluating the radiation integral on the curved surface of a reflecting antenna is presented. A three dimensional Fourier transform approach is used to generate a two dimensional radiation cross-section along a planer cut at any angle phi through the far field pattern. Salient to the method is an algorithm for evaluating a subset of the total three dimensional discrete Fourier transform results. The subset elements are selectively evaluated to yield data along a geometric plane of constant. The algorithm is extremely efficient so that computation of the induced surface currents via the physical optics approximation dominates the computer time required to compute a radiation pattern. Application to paraboloid reflectors with off-focus feeds in presented, but the method is easily extended to offset antenna systems and reflectors of arbitrary shapes. Numerical results were computed for both gain and phase and are compared with other published work

    An Artist as Soldier: Seeking Refuge in Love and Art

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    At the center of this book are the World War II letters (Feldpostbriefe) of a German artist and art teacher to his wife. While Bernhard Epple’s letters to his wife, Gudrun, address many of the topics usually found in war letters (food, lodging conditions, the weather, problems with the mail service, requests for favors from home), they are unusual in two respects. Each letter is lovingly decorated with a drawing and the letters make few references to the war itself. In addition to many personal communications and expressions of love for his wife and children, Epple writes about landscapes he saw as well as churches, museums and bookstores he visited. Epple’s letters give testimony to how a particular German soldier who was drafted and survived the war did his best to remain a civilian in uniform; distancing himself from a reality that was not of his choosing, seeking comfort and refuge in his love for art and his ability to share this love with his wife, herself an artist. While Epple’s letters are deeply personal, this book is about the human experience of war and the separation from civilian life and from family and friends. The introduction provides a short discussion of the importance and uses of war letters as historical documents, followed by a biography of the letter writer. The letters make up the two central chapters. The drawings form an integral part of the letters; each is reproduced and accompanied by an English translation of the letter. In addition to the drawings, the text includes several photographs of the letter writer and his family.https://cupola.gettysburg.edu/books/1126/thumbnail.jp

    Equilibrium Fee Schedules in a Monopolist Call Market

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    Liquidity plays a crucial role in financial exchange markets. Markets typically create liquidity through spatial consolidation with specialist/market makers matching orders arriving at different times. However, continuous trading systems have an inherent weakness in the potential for insufficient liquidity. This risk was highlighted during the 1987 market crash. Subsequent proposals suggested time consolidation in the form of call markets integrated into the continuous trading environment. This paper explores the optimal fee schedule for a monopolist call market auctioneer competing with a continuous auction market. Liquidity is an externality in that traders are not fully compensated for the liquidity they bring to the market. Thus, in the absence of differential transaction costs, traders have an incentive to delay order entry resulting in significant uncertainty in the number of traders participating at the call. A well-designed call market mechanism has to mitigate this uncertainty. The trading mechanism examined utilizes two elements: commitments to trade and discounts in fees for early commitment; thus, optimal transaction fees are time-dependent. Traders who commit early are rewarded for the enhanced liquidity that their commitment provides to the market. As participants commit earlier they pay strictly lower fees and are strictly better off by participating in the call market rather than in the continuous market. A comparison to the social welfare maximizing fee schedule shows that the monopolist does not internalize the externality completely, with the social welfare maximizing schedule offering lower fees to all traders.

    A descriptive study of undergraduate contraceptive attitudes among students at the University of New Hampshire

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    PURPOSE: The purpose of this study was to examine and to understand undergraduate students’ contraceptive attitudes and its effects on contraceptive use to further enhance the education regarding unwanted pregnancies and sexually transmitted diseases (STDs). DESIGN AND METHODS: A descriptive study to understand contraceptive attitudes while exploring demographics and sexual behaviors as well as the incorporation of the Contraceptive Attitude Scale (CAS). The researchers utilized an online survey system to distribute surveys electronically. RESULTS: Most students had a positive attitude regarding contraception. IMPLICATIONS: Nurses at college health facilities can focus on educating the college population since their age group is likely to engage in risky behavior

    The Changing Demographic Profile of the United States

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    [Excerpt] The United States, the third most populous country globally, accounts for about 4.5% of the world’s population. The U.S. population—currently estimated at 308.7 million persons—has more than doubled since its 1950 level of 152.3 million. More than just being double in size, the population has become qualitatively different from what it was in 1950. As noted by the Population Reference Bureau, “The U.S. is getting bigger, older, and more diverse.” The objective of this report is to highlight some of the demographic changes that have already occurred since 1950 and to illustrate how these and future trends will reshape the nation in the decades to come (through 2050). The United States Is Getting Bigger. U.S. population growth is due to the trends over time in the interplay of increased births, decreased deaths, and increased net immigration. The United States Is Getting Older. Aside from the total size, one of the most important demographic characteristics of a population for public policy is its age and sex structure. This report illustrates how the United States has been in the midst of a profound demographic change: the rapid aging of its population, as reflected by an increasing proportion of persons aged 65 and older, and an increasing median age in the population. The United States Is Becoming More Racially and Ethnically Diverse, reflecting the major influence that immigration has had on both the size and the age structure of the U.S. population. This section considers the changing profile of the five major racial groups in the United States. In addition, trends in the changing ethnic composition of the Hispanic or Latino Origin population are discussed. Although this report will not specifically discuss policy options to address the changing demographic profile, it is important to recognize that the inexorable demographic momentum will have important implications for the economic and social forces that will shape future societal well-being. There is ample reason to believe that the United States will be able to cope with the current and projected demographic changes if policymakers accelerate efforts to address and adapt to the changing population profile as it relates to a number of essential domains, such as work, retirement, and pensions; private wealth and income security; the federal budget and intergenerational equity; health, healthcare, and health spending; and the health and well-being of the aging population. These topics, among others, are discussed briefly in the final section of this report. This report will be updated as needed
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