Analyzing safety and fault tolerance using time Petri nets

The application of time Petri net modelling and analysis techniques to safety-critical real-time systems is explored and procedures described which allow analysis of safety, recoverability, and fault tolerance. These procedures can be used to help determine software requirements, to guide the use of fault detection and recovery procedures, to determine conditions which require immediate miti gating action to prevent accidents, etc. Thus it is possible to establish important properties duing the synthesis of the system and software design instead of using guesswork and costly a posteriori analysis

Mineral nutrition of oxygen stressed crops and its relationship to some physiological responses

Historically nutritional studies of anoxic plants have simply catalogued concentration and uptake changes of treated plants, frequently on a non-partitioned whole-plant basis. Major reviews of soil aeration and flooding generally agree that N, P, and K concentrations in plants are reduced by anoxia (Kozlowski, 1984; Glinsld and Stepniewski, 1985). Sodium concentration increases and other major elements either remain unaffected or react irregularly. Until recent years explanations of nutritional changes have focused chiefly on alterations in the poorly aerated soil physicochemical environment. Factors such as: increased mineral solubilization, leaching, and dilution in high water content soils, increased water film coverage of roots, altered ion diffusion, solubility changes at altered valence states, altered pH resulting from redox reactions or increased CO2 concentrations, etc. have been used to explain nutritional responses to oxygen-limiting soil environments

Mineral nutrition of oxygen-stressed crops and its relationship to some physiological responses (Chapter 35)

Historically nutritional studies of anoxic plants have simply catalogued concentration and uptake changes of treated plants, frequently on a non-partitioned whole-plant basis. Major reviews of soil aeration and flooding generally agree that N, P, and K concentrations in plants are reduced by anoxia (Kozlowski, 1984; Glinski and Stepniewski, 1985). Sodium concentration increases and other major elements either remain unaffected or react irregularly. Until recent years explanations of nutritional changes have focused chiefly on alterations in the poorly aerated soil physicochemical environment. Factors such as: increased mineral solubilization, leaching, and dilution in high water content soils, increased water film coverage of roots, altered ion diffusion, solubility changes at altered valence states, altered pH resulting from redox reactions or increased CO2 concentrations, etc. have been used to explain nutritional responses to oxygen-limiting soil environments

Mineral nutrition of oxygen-stressed crops and its relationship to some physiological responses (Chapter 35)

Historically nutritional studies of anoxic plants have simply catalogued concentration and uptake changes of treated plants, frequently on a non-partitioned whole-plant basis. Major reviews of soil aeration and flooding generally agree that N, P, and K concentrations in plants are reduced by anoxia (Kozlowski, 1984; Glinski and Stepniewski, 1985). Sodium concentration increases and other major elements either remain unaffected or react irregularly. Until recent years explanations of nutritional changes have focused chiefly on alterations in the poorly aerated soil physicochemical environment. Factors such as: increased mineral solubilization, leaching, and dilution in high water content soils, increased water film coverage of roots, altered ion diffusion, solubility changes at altered valence states, altered pH resulting from redox reactions or increased CO2 concentrations, etc. have been used to explain nutritional responses to oxygen-limiting soil environments

Mineral nutrition of oxygen stressed crops and its relationship to some physiological responses

Historically nutritional studies of anoxic plants have simply catalogued concentration and uptake changes of treated plants, frequently on a non-partitioned whole-plant basis. Major reviews of soil aeration and flooding generally agree that N, P, and K concentrations in plants are reduced by anoxia (Kozlowski, 1984; Glinsld and Stepniewski, 1985). Sodium concentration increases and other major elements either remain unaffected or react irregularly. Until recent years explanations of nutritional changes have focused chiefly on alterations in the poorly aerated soil physicochemical environment. Factors such as: increased mineral solubilization, leaching, and dilution in high water content soils, increased water film coverage of roots, altered ion diffusion, solubility changes at altered valence states, altered pH resulting from redox reactions or increased CO2 concentrations, etc. have been used to explain nutritional responses to oxygen-limiting soil environments

Letter dated 6 February 1970 from Lewis H. Stolzy to Lorenzo A. Richards

Letter dated 6 February 1970 from Lewis H. Stolzy, professor at the University of California at Riverside's Department of Soils and Plant Nutrition to Lorenzo A. Richards, thanking him for willingness to write a letter of endorsement for John Letey in order to nominate him for an awardUNIVERSITY OF CALIFORNIA, RIVERSIDE BERKELEY • DAVIS • IRVINE • LOS ANCELES • RIVERSIDE • SAN DIECO • SAN FRANCISCO { SANTA BARBARA • SANTA CRUZ COLLEGE OF BIOLOGICAL AND AGRICULTURAL SCIENCES CITRUS RESEARCH CENTER AND AGRICULTURAL EXPERIM ENT STATION DEPARTMENT OF SOILS AND PLANT NUTRITION RIVERSIDE. CALIFORNIA 92502 February 6, 1970 Dr. L. A. Richards 4455-5th Street Riverside, California 92501 Dear Dr. Richards: I appreciate your willingness to write a letter of endorsement for John Letey in order to nominate him for the Soil Science Award of the American Society of Agronomy. I have enclosed a copy of his contributions and evaluations and a list of his publications. Thank you again for your support. Sincerely. Lewis H. Stolzy*^ U Professor of Soil Physics LHS:dem Enclosure