A system dynamics method to assess carrying capacity of a defined natural environment is presented. The proposed method seeks to relate per capita resource usage to ranges of population and per capita consumption beyond which the system is not viable relative to population dependent resource constraints. It provides a platform to investigate system behavior through system dynamics simulations w...

Electrical properties and annealing behaviour of undoped and doped amorphous silicon carbon nitride (a-SiC N ) thin films, x y deposited by ion beam sputtering techniques, have been studied. Doping of the a-SiC N thin films with magnesium (Mg), and x y phosphorous (P) was carried out by ion implantation techniques, and subsequent annealing effect on the electrical conductivity (s) and activatio...

Ab initio MP2/aug’-cc-pVTZ calculations have been performed to determine selected stretching frequencies and chemical shieldings for ternary complexes N-base:PH2F:BeX2 the corresponding binary complexes, with NH3, H2C=NH, HCN as nitrogen bases H, F, Cl substituents X. Be-F P-F depend on distances, respectively, while P F N-P respectively. The graph of versus distance bears a remarkable resembla...

Phytophthora root rot causes extensive damage to feeder roots of avocado. If uncontrolled, it results in a progressive decline in tree health and the eventual death of the tree (12, 14, 15). Phytophthora root rot is a major factor limiting avocado production world wide. Effective control of Phytophthora root rot of avocado has been achieved with fosetyl-al (Aliette® Rhone-Poulenc, aluminum tris...

The structure of gallium arsenide and indium phosphide (0 0 1) surfaces in the metalorganic vapor-phase epitaxy (MOVPE) environment has been investigated. During growth at V/III ratios in excess of 10, both materials are terminated with group V ad-dimers (As or P), alkyl groups and hydrogen atoms. These species sit on top of a complete layer of the group V atoms. As the V/III ratio decreases, t...

BACKGROUND Vitamin D deficiency is highly prevalent in dialysis patients. Whether substitution of native vitamin D in these patients is beneficial is a matter of ongoing discussion, as is the optimal dosing schedule. The purpose of this study was to investigate the efficacy and safety of a body-weight adapted oral dosing regimen of cholecalciferol in dialysis patients. METHODS In a prospectiv...

Phosphorus (P) is one of the primary nutrients generating eutrophication in aquatic systems1. To prevent eutrophication, municipal or agricultural wastewaters are treated to reduce the phosphorus concentrations in the wastewater reaching surface water streams. While unregulated P is a pollutant in a water body, phosphorous is a useful resource in agricultural fertilizers, food supply, and indus...

Background: Phosphorous (P) is an essential nutrient with finite and non-renewable resources; however, it can cause eutrophication in freshwater. The use or storage of red mud (RM), a by-product alumina production high iron aluminium content, poses another environmental issue. Objective: This paper examines the possibility P recovery from various wastewaters landfill leachate RM. Methods: Pulve...