Won\u27t You Come Back?

https://digitalcommons.library.umaine.edu/mmb-vp/5374/thumbnail.jp

Is Aluminum Toxicity a Mechanism of Change in Alpine Plant Communities in Response to Nitrogen Deposition?

Deposition of nitrogen in many areas of the world is increasing with consequences for changes in plant community and ecosystem composition and function. Mechanisms underlying these changes include nitrogen fertilization, loss of base cations (positively charged ions that regulate changes in soil pH), soil acidification, and toxicity of metal ions like aluminum. I investigated aluminum toxicity as a possible mechanism of community change in alpine ecosystems in the Front Range of Colorado. I conducted a controlled greenhouse experiment using two dominant sedge species, Kobresia myosuroides and Carex rupestris. Presence of soluble aluminum in the soil did not affect growth of either species at any level of addition. These results are unique in that other aluminum manipulation studies have shown growth of plants (especially of roots) to be inhibited at lower levels, indicating these plants are resistant to aluminum toxicity. Other mechanisms that might have influenced the observed change of cover in field plots include competition for phosphorus and water, and loss of nutrient cations from the soil. Understanding belowground mechanisms of community shifts is important to predict future changes in areas with increasing nitrogen deposition

Solar energy thermally powered electrical generating system

A thermally powered electrical generating system for use in a space vehicle is disclosed. The rate of storage in a thermal energy storage medium is controlled by varying the rate of generation and dissipation of electrical energy in a thermally powered electrical generating system which is powered from heat stored in the thermal energy storage medium without exceeding a maximum quantity of heat. A control system (10) varies the rate at which electrical energy is generated by the electrical generating system and the rate at which electrical energy is consumed by a variable parasitic electrical load to cause storage of an amount of thermal energy in the thermal energy storage system at the end of a period of insolation which is sufficient to satisfy the scheduled demand for electrical power to be generated during the next period of eclipse. The control system is based upon Kalman filter theory

Development of a Test of Aptitude for Veterinary Medicine

Particularly since the war, schools of veterinary medicine have been able to enroll for training only a relatively small percentage of their applicants. An increased emphasis upon the importance of identifying the best qualified candidates has resulted in a careful reexamination of selection procedures and in recognition of the possible utilization of some sort of veterinary aptitude test

Alien Registration- Owens, William H. (Easton, Aroostook County)

https://digitalmaine.com/alien_docs/26556/thumbnail.jp

Operationalization of the fuzzy concept : employability improvement of the curriculum in the public school system in the Virgin Islands.

EducationDoctor of Education (Ed.D.

Evaluation of Benedict\u27s equation for calculation of critical pressures of hydrocarbon mixtures

An introduction to the problem of critical pressure calculations of mixtures is presented, followed by a brief history of prior work in this field. Mentioned in the history are the correlations of Watson and Nelson, Smith and Watson, Mayfield, Kuratta and Katz, Benedict, and Edmister. Another section contains a series of tables showing critical pressure calculated by Benedict\u27s equation as contrasted to other data appearing in the literature. An evaluation of the equation is then made from the comparisons. Included are curves of the values shown in the tables end a series of curves depicting the deviation of these values from the experimental