Device prepares aluminum surfaces for welding

Dry machining technique removes original surfaces to obtain contamination free welding surface. Device straddles edge being prepared and aligns with existing edges and adjacent surfaces of workpiece while sensing device regulates cut depth. Description of prototype is given

Prediction, evaluation, and specification of flying qualities by means of step target tracking

A new approach to flying qualities specification and evaluation is presented which coordinates current research in the areas of pilot ratings, pilot-aircraft modeling techniques, and simulation and flight test procedures. A time-domain pilot model is described which can model discontinuous and nonlinear pilot behavior in conjunction with completely general time-varying nonlinear aircraft models to simulate discrete maneuvers. This pilot-aircraft model is applied to an existing set of in-flight simulation data, and calculates tracking error and time-on-target statistics for step target tracking that directly relate to the reported pilot comments and ratings. Predicted step target tracking data for eighteen F-5E flight conditions are presented, and the use of the method for control system design is demonstrated using the YF-17

Prediction of pilot reserve attention capacity during air-to-air target tracking

Reserve attention capacity of a pilot was calculated using a pilot model that allocates exclusive model attention according to the ranking of task urgency functions whose variables are tracking error and error rate. The modeled task consisted of tracking a maneuvering target aircraft both vertically and horizontally, and when possible, performing a diverting side task which was simulated by the precise positioning of an electrical stylus and modeled as a task of constant urgency in the attention allocation algorithm. The urgency of the single loop vertical task is simply the magnitude of the vertical tracking error, while the multiloop horizontal task requires a nonlinear urgency measure of error and error rate terms. Comparison of model results with flight simulation data verified the computed model statistics of tracking error of both axes, lateral and longitudinal stick amplitude and rate, and side task episodes. Full data for the simulation tracking statistics as well as the explicit equations and structure of the urgency function multiaxis pilot model are presented

First Year Projects and Activities of the Environmental Remote Sensing Applications Laboratory (ERSAL)

Activities, pilot projects, and research that will effectively close the gap between state-of-the-art remote sensing technology and the potential users and beneficiaries of this technological and scientific progress are discussed in light of the first year of activity. A broad spectrum of resource and man-environment problems are described in terms of the central thrust of the first-year program to support land use planning decisions with information derived from the interpretation of NASA highlight and satellite imagery

Error rate information in attention allocation pilot models

The Northrop urgency decision pilot model was used in a command tracking task to compare the optimized performance of multiaxis attention allocation pilot models whose urgency functions were (1) based on tracking error alone, and (2) based on both tracking error and error rate. A matrix of system dynamics and command inputs was employed, to create both symmetric and asymmetric two axis compensatory tracking tasks. All tasks were single loop on each axis. Analysis showed that a model that allocates control attention through nonlinear urgency functions using only error information could not achieve performance of the full model whose attention shifting algorithm included both error and error rate terms. Subsequent to this analysis, tracking performance predictions for the full model were verified by piloted flight simulation. Complete model and simulation data are presented

BLACKBIRD DEPREDATIONS IN ANIMAL INDUSTRY: POULTRY RANGES AND HOG LOTS

I\u27m going to move over onto poultry ranges, turkey ranges and hog farms where we have species of birds such as the herring gull, the pigeon, the starling and English sparrow. As a rule, these birds travel relatively great distances from roosts and loafing areas out to the feeding ranges. And why shouldn\u27t they? There is ample high energy food available and usually lack of human disturbance. So they frequent these places during the daylight hours. Actually the losses from these operations are pretty hard to evaluate. Sometimes it is direct, the farmer feels the impact; other times it\u27s indirect. We do suspect diseases being carried onto the poultry range or hog farm by these wild birds. Let\u27s examine these four species and find where the damage occurs. I\u27ll tell you what we are doing to reduce this damage. The herring gull, in this part of the country (midwest-Great Lakes) and also along the Atlantic Coast, is increasing in numbers by leaps and bounds. Also the herring gull has become a bum. In its original environment, it foraged along the shoreline and behind fishing vessels and it did very well. Now he\u27s turned into a bum, because we\u27ve turned into bums. Our unsanitary ways of managing dumps and hog lots have made things ideal for the herring gull and he\u27s adjusted very nicely to these conditions. Consequently, he\u27s moved onto hog lots where they cook garbage and dump it onto the land. He also follows garbage feeding trucks through the hog lots where they dump cooked garbage into the feeding troughs. The gull is taking food from the hogs and from the farmer. Also because he visits the dump, then goes to the hog lot, he is also carrying such transmissible diseases as hog cholera. Also herring gulls are suspected of carrying TGE (transmissible gastroenteritis). Because they perch upon farm buildings, gulls are also adding to structural deterioration

Creep Fed Lambs

This report details the results of tests comparing creep-fed vs. non-creep-fed lambs

A comparison of the teaching behavior of male and female pre-service secondary physical education teachers

The purpose of this study was to determine if any significant differences occurred in the teaching behavior of male and female pre-service secondary physical education teachers. [This is an excerpt from the abstract. For the complete abstract, please see the document.

Retiring 2055: Evolution and education in a long library career

As a librarian at the beginning of her career, the author considers possible near and far-term futures for libraries and librarianship. In this conference proceeding she will discuss her views on the evolving roles of libraries and librarians, possible gap areas in professional development, and possibilities for preparing for evolving patron needs.  In exploring the possible future of libraries, the proceeding will examine the views of professional literature, colleagues, and the author’s personal viewpoint.  Discussion will include the importance of understanding data and the growing need to understand statistical analysis and software; how to utilize professional organizations and personal networks to address learning gaps; and best bet resources for individual learning pursuits

Local Charge Excesses in Metallic Alloys: a Local Field Coherent Potential Approximation Theory

Electronic structure calculations performed on very large supercells have shown that the local charge excesses in metallic alloys are related through simple linear relations to the local electrostatic field resulting from distribution of charges in the whole crystal. By including local external fields in the single site Coherent Potential Approximation theory, we develop a novel theoretical scheme in which the local charge excesses for random alloys can be obtained as the responses to local external fields. Our model maintains all the computational advantages of a single site theory but allows for full charge relaxation at the impurity sites. Through applications to CuPd and CuZn alloys, we find that, as a general rule, non linear charge rearrangements occur at the impurity site as a consequence of the complex phenomena related with the electronic screening of the external potential. This nothwithstanding, we observe that linear relations hold between charge excesses and external potentials, in quantitative agreement with the mentioned supercell calculations, and well beyond the limits of linearity for any other site property.Comment: 11 pages, 1 table, 7 figure