Application of remote sensing in the study of vegetation and soils in Idaho

There are no author-identified significant results in this report

A digital scene matching technique for geometric image correction and autonomous navigation

A technique is described for precise registration of two images of the same area, taken under different conditions. The technique, called AUTO-MATCH, involves digital preprocessing of the images to extract edge contours, followed by a correlation of corresponding edge end points. The availability of an array of endpoints makes possible subpixed registration accuracy. The technique is applied to a system for assessment of geometric image quality, to be installed at NASA-Goddard. This system measures the registration vectors over an array of window pairs from LANDSAT images, so as to determine the distortion between them. Similar measurements could be used to infer relative positioning of the spacecraft. The technique is considered for updating the inertial navigation systems of missiles or aircraft. Scene matching between an image obtained aboard the vehicle and a stored reference can eliminate the drift of an inertial platform in order to demonstrate this capability in real time. A laboratory demonstration of AUTO-MATCH is described

Notes on the Production and Some Electrical Properties of Tellurium Crystals

This report deals with the production of Tellurium crystals, and the effect of temperature on their electrical properties. An investigation of Tellurium was undertaken primarily to settle the question of its change of resistance with light, or its light sensitiveness. It occurs in the periodic table in the same column with Selenium, and in the same row with antimony, which elements show an effect on light sensitiveness. Adamsin 1876 made some experiments on Tellurium cells and reported \u27\u27a distinct though very slight influence of light on their conductivity . Siemens, Knox, and Saunders report that there is no effect of light that cannot be explained as the effect of heat. Selenium crystals differ in certain ways from Selenium cells, and it was this fact that suggested the idea of securing Tellurium crystals for the tests

Lidocaine Prophylaxis in Acute Myocardial Infarction

The prophylactic administration of lidocaine for the prevention of primary ventricular fibrillation (VF) following suspected acute myocardial infarction (Ml) is controversial. The incidence of primary VF following acute Ml ranges from 1.8% to 10.5%. Warning arrhythmias have not been shown to be reliable predictors of VF. In-hospital prophylactic administration of lidocaine has been shown to decrease the incidence of primary VF. whereas prehospital administration has not. However, prophylactic administration of lidocaine has not been shown to have a beneficial effect on mortality and may in fact increase mortality. The incidence of lidocaine-induced adverse effects during prophylaxis ranges from 4% to 85%, with an average of approximately 35%. In view of the low incidence of primary VF following acute Ml, the high incidence of lidocaine-induced adverse effects, and the lack of evidence of beneficial effect on mortality, prophylactic lidocaine administration to all patients with suspected Ml is not recommended. The American Heart Association and American College of Cardiology recommend prophylactic lidocaine administration in patients with acute myocardial ischemia or Ml who have ventricular premature heats that occur frequently (\u3e 6 per minute), are closely coupled (R on T), multiform in configuration, or occur in short bursts of three or more in succession

Service-Learning Planning for Retirement Presentation

This project sought to understand the reasons/variables for the lack of participation in planning and saving/investing for retirement by the younger generations that are a part of the current workforce. The problem was defined, and the approach was to create a presentation that established the foundational knowledge for retirement investing among high school students (the individuals who are just about to enter the workforce). The presentation was made, along with a short survey, and sent out to high school teachers in Idaho and Texas. The results presented that there is a fundamental lack of knowledge with regards to the subject of retirement planning in general. Based on the feedback from both the teachers and the students, it was very apparent that the very fundamental information that they were introduced to through this project was previously unknown by that vast majority of the participants

A Design for Electrical Regulation of High Temperature Ovens

In growing Tellurium crystals, a temperature within a few degrees of 450 centigrade must be maintained constantly. The electrical oven available consisted of a porcelain tube five centimeters in diameter and thirty centimeters long, covered with asbestos. The need for making a regulator arose from the fact that nowhere in the catalogues available was there a regulator advertised that would, be contained within the tube without completely closing it. Nearly all temperature regulators for electrically heated apparatus break the heating current when the temperature rises to a given point, and make it when the apparatus cools, and the difference between these two temperatures is the regulation of the device. It requires 10 amperes to heat this particular oven to 500 degrees centigrade, and simple expansion could not be relied upon to make a gap sufficiently wide to prevent sparking and at the same time give any very close regulation

Application of remote sensing in the study of vegetation and soils in Idaho

There are no author-identified significant results in this report

An Electrical Device for Securing and Maintaining Constant High Temperatures

In a paper read before this Academy last year, a device for controlling comparatively high temperatures (up to about 600 C) was explained, together with the necessary auxiliary apparatus, an ordinary electro-magnet circuit breaker, and the source of constant potential necessary to operate this magnet. The oven described in that paper consisted of a properly insulated porcelain tube 30 cm. long and 5 cm. in diameter. It required 10 amperes to heat it to 450° C. The dimensions of the oven limited the size of the tubes in which the crystals were to be produced to not more than 3 cm. in diameter and 15 cm. in length, and admitted but one at a time. Inasmuch as it requires several months to produce crystals of a size such as is necessary for optical and electrical work, the disadvantage of the oven may be readily seen

Geometric assessment of image quality using digital image registration techniques

Image registration techniques were developed to perform a geometric quality assessment of multispectral and multitemporal image pairs. Based upon LANDSAT tapes, accuracies to a small fraction of a pixel were demonstrated. Because it is insensitive to the choice of registration areas, the technique is well suited to performance in an automatic system. It may be implemented at megapixel-per-second rates using a commercial minicomputer in combination with a special purpose digital preprocessor