1946 Fertilizer Recommendations for Field Crops, Permanent Pastures and Hay Fields

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Locally managed irrigation systems: essential tasks and implications for assistance, management transfer and turnover programs

This monograph examines the construction, operation and maintenance tasks that shape the nature of locally managed irrigation systems. The objective of the book is to identify relevant experiences and lessons for staff who are responsible for working with locally managed systems in three types of programs: direct assistance to existing locally managed irrigation systems, turnover of public owned systems to local management, and transfer of partial management to farmer groups within larger systems that remain publicly controlled.Irrigation management, Irrigation systems, Irrigation scheduling, Privatization, Farmer participation, Water management, Water rights, Water allocation, Resource management, Organizational dynamics, Conflict, Communication, Training, Farm Management, Institutional and Behavioral Economics,

Mennonite missionaries and African Independent Churches: the development of an Anabaptist missiology in West Africa: 1958-1967

This dissertation analyzes Mennonite missionary engagement with African Independent Churches in West Africa. The engagement between missionaries and indigenous churches gave rise to a novel mission interaction with a non-western form of Christianity. It led to the early development of mission strategy and theory from an intentionally Anabaptist perspective. Based upon close analysis of archival material, the dissertation examines the extended encounter between missionaries and Independents in southeastern Nigeria between 1958 and 1967. It places the encounter within the context of the religious history of both groups and outlines the influence of the experience on subsequent mission work. This case study sheds new light on the emergence of African indigenous Christian movements and western Christians’ interaction with those movements during the period of decolonization and African nationalism. The history that this study constructs shows that the religious and missiological assumptions that each party brought to the encounter complicated their relationship. The Independents’ religious history led them to expect missionaries to establish traditional mission educational and healthcare institutions that would reinforce their well-being. Missionaries Edwin and Irene Weaver and their colleagues were hesitant to do so, since their experience in India had convinced them that such institutions caused dependency on foreign funds and impeded indigenization. They focused, rather, on encouraging better relationships between estranged Independents and mission churches, capacitating Independent churches through biblical training, and reinforcing Independents’ indigenous identity. Yet some Nigerian Independents insisted on a traditional mission relationship and its accompanying Mennonite identity. Missionaries borrowed mission theory about indigenization from the wider missionary movement, but applied and modified it over time, finally incorporating it into an Anabaptist missionary approach for work in Nigeria, Ghana, Cote d’Ivoire and the Republic of Benin. This study suggests that while relationships between streams of the Christian movement are conditioned by their different religious histories and cultures, they nevertheless generate missiological insights. Through this engagement missionaries articulated an Anabaptist missiology that became influential throughout Africa. In turn, the Mennonite missionary presence enabled some Nigerian Independents to network successfully with the world Christian movement via their Mennonite affiliation

Patients' Perceptions and Treatment Effectiveness

An extensive literature relating patients’ expectations to treatment outcomes has not addressed the determinants of these expectations. We argue that treatment history is part of a reference point that influences patients’ expectations of how effective further treatment might be, thus influencing whether to proceed with additional treatment or not. We hypothesize that those patients with unsuccessful prior treatments have diminished expected improvement from subsequent treatments. Prospect theory provides a theoretical foundation for reference frame effects, and the model is tested with data on patients diagnosed with idiopathic intracranial hypertension. Our results support the reference frame hypothesis.Prospect Theory, Treatment Outcomes, Treatment History, Misclassification, Monotone Rank Estimator

Perceptions of Basic Communication Texts: Factors in Student Learning and Textbook Adoption Decisions

The purpose of this study is to assess existing pedagogical assumptions about basic communication course textbook features. Two separate surveys were administered to students (N= 1,379) and instructors (N= 118) in basic communication courses at 15 colleges and universities. The findings of the study are twofold. First, students and teachers differ in their perceptions of usefulness of textbook pedagogical features. Second, students perceive basic course texts to be less difficult and less theoretical though more interesting, enjoyable, relevant, and practical than other introductory course texts. When making publication and text selection decisions, the findings help authors and teachers better choose and present textbook materials

Soil Characterization Using Textural Features Extracted from GPR Data

Soils can be non-intrusively mapped by observing similar patterns within ground-penetrating radar (GPR) profiles. We observed that the intricate and often indiscernible textural variability found within a complex GPR image possesses important parameters that help delineate regions of similar soil characteristics. Therefore, in this study, we examined the feasibility of using textural features extracted from GPR data to automate soil characterizations. The textural features were matched to a fingerprint database of previous soil classifications of GPR textural features and the corresponding ground truths of soil conditions. Four textural features (energy, contrast, entropy, and homogeneity) were selected for inputs into a neural-network classifier. This classifier was tested and verified using GPR data obtained from two distinctly different field sites. The first data set contained features that indicate the presence or lack of sandstone bedrock in the upper 2 m of a shallow soil profile of fine sandy loan and loam. The second data set contained columnar patterns that correspond to the presence or the lack of vertical preferential-flow paths within a deep loess soil. The classifier automatically grouped each of these data sets into one of the two categories. Comparing the results of classification using extracted textural features to the results obtained by visual interpretation found 93.6% of the sections that lack sandstone bedrock correctly classified in the first set of data, and 90% of the sections that contain pronounced columnar patterns correctly classified in the second set of data. The classified profile sections were mapped using integrated GPR and GPS data to show surface boundaries of different soil categories. These results indicate that extracted textural features can be utilized for automatic characterization of soils using GPR data

Building an Engineering Honors Curriculum: Collegiate Consistency with Individual Flexibility

Recently, Honors at Iowa developed a curriculum that all student members must complete to graduate with University Honors. The curriculum has two primary components; the first is building knowledge through course work and the second is the application of knowledge through hands on learning experiences. Because, however, the engineering undergraduate curriculum is more structured and sequential in nature than the curriculum of the other undergraduate colleges, a distinct honors engineering curriculum was developed collaboratively between the College of Engineering and the University Honors Program. This engineering-specific honors curriculum maintained the key features of course work and experience-based learning valued by engineering and honors, but allowed for unique out-of-class experiences available to University of Iowa engineering students to be woven into the curriculum. The standard Honors curriculum for undergraduates at Iowa is 12 credit hours of honors coursework and 12 credit hours of experience-based learning. The 12 credits of coursework are commonly completed early in the students’ education through honors offerings of general education courses. In contrast, the experiential component is most commonly pursued by upper class students and includes opportunities such as Honors in the major, research, study abroad, internships, and a variety of types of courses such as teaching practica, service learning, and graduate courses. This standard 12/12 Honors curriculum is still available to engineering honors students, but many engineering students’ schedules are limited in flexibility, and the number of honors offerings that fit their needs is also limited. To maintain consistency in University Honors across the colleges and also accommodate the emphasis in engineering on applied learning, the College of Engineering and Honors Program agreed to reduce the required number of hours of honors coursework and increase proportionately the amount of experience-based learning in the honors curriculum. This has become known as the Engineering Alternative and highlights more out-of-class opportunities that provide discipline-specific learning. For example, engineering students can count leadership positions in engineering student organizations for honors credit because these organizations incorporate a project with faculty oversight. Engineering honors students may also deepen their knowledge and help other students by serving as tutors or by participating in other service roles in the College of Engineering. These opportunities are in addition to the standard experiential learning options of honors in the major, research, study abroad, and internships. Together, the varied options of the Honors Engineering Alternative curriculum allow students great flexibility in completing University Honors that is of equivalent depth to the 12/12 standard Honors Curriculum. The result of the collaboration between Honors and the College of Engineering is an honors curriculum that meets the general requirements of the Honors curriculum but also is flexible enough to accommodate the more structured and sequential nature of the engineering curriculum

Brush seal leakage performance with gaseous working fluids at static and low rotor speed conditions

The leakage performance of a brush seal with gaseous working fluids at static and low rotor speed conditions was studied. The leakage results are included for air, helium, and carbon dioxide at several bristle/rotor interferences. Also, the effects of packing a lubricant into the bristles and also of reversing the pressure drop across the seal were studied. Results were compared to that of an annular seal at similar operating conditions. In order to generalize the results, they were correlated using corresponding state theory. The brush seal tested had a bore diameter of 3.792 cm (1.4930 in), a fence height of 0.0635 cm (0.025 in), and 1800 bristles/cm circumference (4500 bristles/in circumference). Various bristle/rotor radial interferences were achieved by using a tapered rotor. The brush seal reduced the leakage in comparison to the annular seal, up to 9.5 times. Reversing the pressure drop across the brush seal produced leakage rates approx. the same as that of the annular seal. Addition of a lubricant reduced the leakage by 2.5 times. The air and carbon dioxide data were successfully correlated using corresponding state theory. However, the helium data followed a different curve than the air and carbon dioxide data

Application of Fuzzy-Neural Network in Classification of Soils using Ground-penetrating Radar Imagery

Errors associated with visual inspection and interpretation of radargrams often inhibits the intensive surveying of widespread areas using ground-penetrating radar (GPR). To automate the interpretive process, this paper presents an application of a fuzzy-neural network (F-NN) classifier for unsupervised clustering and classification of soil profile using GPR imagery. The classifier clusters and classifies soil profiles strips along a traverse based on common pattern similarities that can relate to physical features of the soil (e.g., number of horizons; depth, texture and structure of the horizons; and relative arrangement of the horizons, etc). This paper illustrates this classification procedure by its application on GPR data, both simulated and actual real-world. Results show that the procedure is able to classify the profile into zones that corresponded with those obtained by visual inspection and interpretation of radargrams. Results indicate that an F-NN model can supply real-time soil profile clustering and classification during field surveys