The thermal degradation of foamed polymethyl methacrylate (PMMA) patterns in the expendable pattern casting process has been studied. Various physical transitions that may occur during the degradation of PMMA have been determined using scanning electron microscopy, differential scanning calorimetry, and thermogravimetric analysis, and the effects of polymer density on the degradation characteri...

CONCLUSION This paper has demonstrated that PbH, is not generated in organic media in conditions similar to those required in water. It has been proved that when lead is introduced in the form of a volatile organometallic compound, such as PbR4, the process that takes place is the volatilization of the PbR, itself and not the formation of PbH4 as might be expected. This volatilization is even m...

Nitrogen-15 ( N)-labeled biogas slurry (digested anaerobic organic residues (DAOR)) and chemical 15 fertilizer (CF) were applied to soil with low fertility cropped with rice. The N dilution method was used to 15 estimate the N uptake and recovery; potted soil was labeled with 1.0 atom % excess [ N] ammonium chloride 15 NH Cl. Certain select soil characteristics were also measured in soil amende...

The goal of this project was to measure directly the volatilization of gas phase polychlorinated biphenyls (PCBs) from stabilized dredged material (SDM) in a • laboratory scale flux chamber. This study complements earlier field observations (Phase I) to estimate PCB fluxes from SDM being applied to a landfill (Korfiatis et. al., 2003, Miskewitz et al, 2004). Phase I included measurements of the...

A sprinkler irrigation system was tested to assess its efficacy for volatilizing organic chemicals in pumped groundwater. In field tests involving the analysis of more than 250 samples collected from beneath a spray irrigation system, removal rates of ethylene dibromide (EDB), 1,1,2-trichloroethylene (TCE), 1,1,1-trichloroethane (TCA), and carbon tetrachloride (CT) in samplers placed 0.5 m abov...

Different organic materials possessing antimicrobial properties have the ability to retard nitrification. Nitrification retarders could be successfully used to improve fertilizer efficiency if the retarders do not increase ammonia volatilization as well. The main objective of this study was to find whether any locally available organic materials namely cow dung, seed crush of Syzygium cumini, L...

(1) Background: the broadcast is an outdated fertilization method with a low fertilizer-utilization rate and environmental problems, which seriously restricts development of agriculture. (2) Methods: Under machine-transplanted rice side-deep (MRSF) mode, five treatments were applied: 0 cm (D0), 5 (D5), 7.5 (D7.5), 10 (D10), comprising four different depths fertilization, no (CK). The yield, acc...

Effective nitrogen (N) management in cotton production is essential in order to achieve proper growth and development. However, soil-incorporated N can undergo a series of chemical conversions along with numerous loss mechanisms (leaching, volatilization and denitrification) that can make N unavailable to the plant. In addition, soil-incorporated N has faced much scrutiny over the years for its...