In many communities the proposal to add minute quantities of a fluoride to the water supply as a means of reducing the amount of tooth decay in the population has provoked bitter controversy. Here is a study that inqu...
In many communities the proposal to add minute quantities of a fluoride to the water supply as a means of reducing the amount of tooth decay in the population has provoked bitter controversy. Here is a study that inquires into the attitudes and motivations of the people who vote against fluoridation in the referenda which have been held on the issue.
This textbook focuses on a set of skills-based learning outcomes common among undergraduate environmental programs. It covers critical scientific skills and ways of thinking that bridge the gap between the knowledge-b...
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ISBN:
(数字)9783030285425
ISBN:
(纸本)9783030285418;9783030285449
This textbook focuses on a set of skills-based learning outcomes common among undergraduate environmental programs. It covers critical scientific skills and ways of thinking that bridge the gap between the knowledge-based content of introductory environmental textbooks and the professional skills students of the environment need to succeed in both their academic programs and professional careers. This emphasis on skills is gaining more traction among academic programs across the country as they shift focus from knowledge delivery to learning outcomes and professional competencies. The book features clear methodological frameworks, engaging practice exercises, and a range of assessment case studies suitable for use across academic levels. For introductory levels, this text uses guided practice exercises to expose students to the skills they will need to master. At the capstone level, this text allows students to apply the knowledge they have gained to real-world issues and toevaluate their competency in key programmatic learning outcomes.;A detailed answer key with rubrics customized for specific questions and sample answers at various competency levels is available to verified course instructors. Access to these answer key resources can be obtained by contacting the Springer Textbook Team at Textbooks@***
While American young people do not match the passionate involvement in politics and foreign affairs of students in some other countries, they promise to be very influential as citizens and public leaders during the cr...
While American young people do not match the passionate involvement in politics and foreign affairs of students in some other countries, they promise to be very influential as citizens and public leaders during the critical years ahead. The exploration of their personal values and public attitudes is therefore an important research objective. This paper reports a study centered on a hypothesis about the relationships between certain personal values and ideals for international relations.
作者：
RANSOM, HARRY H.THE AUTHOR is the Research Associate
Defense Studies Program Graduate School of Public Administration Harvard University. He received his Bachelor of Arts degree from Vanderbilt University in 1943 and his Master of Arts and Ph.D. from Princeton University in 1949 and 1954. He has taught Political Science at Princeton Vassar College and Michigan State University. He was Assistant Professor of Political Science at the latter institution when he came to Harvard in July 1955. During 1953-54 Dr. Ransom was a “Congressional Fellow” of the American Political Science Association working on Capitol Hill as a staff member for Senators and Congressmen.
作者：
Robert B. Cate Jr.Larry A. NelsonResearch Associate
International Soil Fertility Evaluation & Improvement Program Dept. of Soil Science and Professor Dept. of Statistics North Carolina State Univ. Raleigh N.C.
Most soil test laboratories divide soil test results into two or more classes for the purpose of making fertilizer recommendations. This is usually done for the practical reason that it reduces the number of different...
Most soil test laboratories divide soil test results into two or more classes for the purpose of making fertilizer recommendations. This is usually done for the practical reason that it reduces the number of different recommendations necessary. However, the basis for defining the different classes (e.g., Very Low, Low, Medium, etc.) is often subjective or arbitrary. This paper explains a simple, yet statistically sound, method for setting the class limits. The procedure is to split the data into two groups, using successive tentative critical levels to ascertain that particular critical level which will maximize overall predictive ability ( R 2 ), with the means of the two groups (classes) as the predictor values. The paper presents an actual example, using data believed typical of this kind of problem. Several continuous correlation models were also fitted to the same data. None gave as high an R 2 as a single Low-High split defined by the suggested procedure. Similar results have been obtained with a majority of 200 sets of soil test correlation data, indicating that the new procedure may be widely applicable.
In a 4-year study we evaluated several frequencies, dates, and rates of nitrogen applications for stimulating growth of a Kentucky bluegrass-orchardgrass-white clover sward during midsummer. Stimulation of midseason p...
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In a 4-year study we evaluated several frequencies, dates, and rates of nitrogen applications for stimulating growth of a Kentucky bluegrass-orchardgrass-white clover sward during midsummer. Stimulation of midseason production from the nitrogen variable was only obtained during favorable growing seasons. In such seasons the shift of nitrogen application from early March and early May to late March and late May delayed dry matter peak production by several weeks without reducing annual production. In general, seven applications of nitrogen, to obtain an annual total of 224 kg N/ha, were no better in stimulating midsummer growth than four or three. Likewise, four applications were of no advantage over three. However, when nitrogen levels reached 894 kg/ha, the more frequent application appeared superior to three or four. Little change in midseason dry matter production was associated with changing application date from late month to early month. Increasing nitrogen levels up to 448 kg/ha generally resulted in significant increases in dry matter production. However, when the relative yield distribution from the nitrogen treatments (1967) was compared to the check (plots receiving no nitrogen, but with adequate lime, P 2 0 5 and K 2 0) no difference was obtained.
作者：
H. D. GrossLemuel GoodeR. G. PetersenAssociate Professor of Crop Science and Agent
Crop Research Division ARS USDA and Associate Professors of Animal Science and Experimental Statistics respectively. The authors wish to express their appreciation to D. S. Chamblee H. L. Lucas and W. W. Woodhouse Jr. for their assistance in the development of this research program.
Covariance analysis served to increase the precision with which some grazing trial criteria were estimated. The magnitude of the increase decreased sharply with increasing time intervals.
Covariance analysis served to increase the precision with which some grazing trial criteria were estimated. The magnitude of the increase decreased sharply with increasing time intervals.
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