Are you sitting down? Towards cognitive performance informed design

With many digital interaction designs, we can choose to operate the devices from a variety of postures – what we call self-positioning. In this paper we test two of these choices – sitting vs standing against standard neuropsychological assessments of cognitive executive function. We show that such choices do have significant effects on various cognitive processes. We argue therefore that there is an opportunity to extend parameters of digital interaction design to include self-position in order to optimize that design’s effectiveness for its intended activity

The Combined Economics Deprtment: A Report on the State of the Union

The Economics Department is an immensely productive group. Our endeavors are probably more diverse than any department on campus. This is a short review of major areas in the department. Research. We have research that ranges from the most applied, localized service type work to concerns with international monetary systems and trade. To be sure the major portion of our effort is highly localized and policy oriented. We thought you might be interested in a listing of publications for the past couple of years. An earlier couple of years is also there. Perhaps if we have a shortcoming in our research it is in (to use President Cazier\u27s words) celebrating our successes and accomplishments to those who have political prominence in the state. We contend that we are indeed a great department in our research work. Especially, I bel ieve we have developed the capacity and facility to do interdisciplinary research as well as any group of Economists and Ag Economists in the world. Our publications list joint work with engineers, sociologists, many agricultural scientists, and a host of others. I don\u27t know of any group that even comes close to us in this respect. This ability and willingness is fundamental in addressing real world problems. It also carries over to teaching and extension

The role of Systems Analysis in Water Supply Planning: Avoiding the Fallacy of Composition

Things are not always as they seem. Presented here are a few examples of first impressions and possible errors in thought patterns. As an example, by some means the size of the earth is to be increased by one foot in diameter. Transcontinental Airlines and others are concerned with how much further it will be around the circumference of the earth. What is your answer? Quick! What\u27s your answer

The Inefficiency and Inequity of the Proposed Rules and Regulations on Acreage Limitation on Bureau of Reclamation Projects

Consider various countries in the world. Those where the standard of living is high are where the farm sector has been sufficiently productive to release most of the manpower to the industrial and service sectors. Developing countries that include most of the people of the world are bound down to a majority of productive workers in the country producing the basic food and fiber for the rest of the country

AN ECONOMIC INTERPRETATION OF IMPACT OF PHENOLOGICALLY TIMED IRRIGATION ON CORN YIELD

An economic production function was derived in an analysis of water application to corn by phonological time periods. The quantities of use of water by growth periods as delineated by physical stages were tested for influence on final output of dry matter and grain. Several yearsÂ’ data for three locations were utilized. The results tend to confirm the conceptual models and previous work in this type of analysis. Certain periods of growth were more critical than others.Crop Production/Industries,

Swine Finishing Room Air Infiltration: Part 2. Infiltration as Affected by Room Characteristics

Data collected on 17 swine finishing rooms from the Midwest region of the United States was used to study the relationship between infiltration rate and selected room characteristics. Effect of individual room characteristics on room infiltration rate were tested by simple linear regression (SLR) while multiple linear regression (MLR) was used to develop models for improved prediction. SLR results revealed that the total (It) and other (Io; non-curtain/fan locations) swine finishing room infiltration rates were inversely related to room width and directly related to room length and ceiling height. As expected, rooms with higher curtain end pocket overlap, curtain closure overlap distance, and in excellent condition had reduced curtain infiltration (Ic). To reduce fan infiltration (If), fan and pump-out cover perimeter and fan area should be minimized. Power law equations fitted for groups of rooms were found ineffective in accounting for the large variability in infiltration rates of swine finishing rooms as compared to MLR models. MLR models developed for It and Io prediction at 10, 20, and 30 Pa pressure differences were found to improve the prediction over power law models for groups of rooms. At 20 Pa, prediction differences compared with individual room measurements for It rate using the suggested MLR model, as compared to power law models for groups of rooms, were less by at least 61%; whereas, in the case of Io rate, prediction differences compared with individual room measurements were less by at least 49%. Recommendations made in this article, with respect to the relationship between a particular room characteristic and room infiltration rate, could be used as guiding principles along with other design criterion to reduce infiltration rates in remodeled and new swine finishing rooms

Normative supply functions and optimum farm plans for northeastern Iowa

This study is part of a regional study in adjustments and supply responses in dairy production. It has two major objectives. One is the application of linear programming to specify optimal organization of typical farms representative of all farms in northeastern Iowa. The second objective is to compute normative supply functions for milk and hogs. As a further step in the latter objective, the results of this study will be combined into a regional study in which normative supply response for milk is aggregated over parts of five states. In the Iowa portion of the study, reported here, farm plans and normative supply functions were derived by parametric (variable-pricing) linear programming for each of 10 representative farms. The technical coefficients used were designed to reflect a level of management and farm technology considered attainable by farmers in 1965. Prices also were estimated for 1965. However, prices for milk and hogs were varied to derive supply functions from optimal farm plans. These normative supply functions reflect optimal levels of production for the various prices

Nitrogen Source and Application Method: Does It Matter?

Irrigation management has a greater effect on the amount of nitrate that is leached out of the root one than does the type of nitrogen applied