Papers by Keyword: Carrier Material

Abstract: This paper reports the performance of a graphite and silica nanoparticles-based delivery system for T. harzianum in controlling the in vitro growth of R. solani and damping-off disease on tomato plants. The in vitro and in vivo experiments were arranged in the randomized complete block design. The in vitro treatment was a dual culture of R. solani and T. harzianum in the various components of formulation on PDA, i.e., T. harzianum + 5 wt.% graphite, T. harzianum + 1wt.% silica NPs., T. harzianum + 5 wt.% graphite + 1 wt.% silica nanoparticles, T. harzianum, 5 wt.% graphite, 1 wt.% silica nanoparticles, fungicide (mancozeb), and a control. The in vivo treatment included the application of T. harzianum in the same compositions as the in vitro treatment, except that there were two controls i.e., inoculated and noninoculated tomato plants with R. solani. T. harzianum by soaking tomato seeds in the formulation suspensions before planting. The results showed that all formulation compositions were able to inhibit the in vitro growth of R. solani. The inhibitions of the colony growth of R. solani caused by formulated and non-formulated T. harzianum were the same. This proved that graphite and silica NPs did not resist to the ability of T. harzianum in controlling R. solani, indicated that the formulation was promising to develop. However, the inhibition of damping-off disease incidence on tomato plants caused by formulated T. harzianum was the same as the non-formulated one only on day 7 after treatments. On days 14, 21, and 28, the inhibitions were lower than the non-formulated ones. It was suggested to reapply the formulation of T. harzianum in the soil at planting and several days after.

Abstract: Metal foil strain gauges are most widely used for the stress analysis in engineering structures. Typical strain gauge system includes strain sensitive grid, carrier material, and adhesive layer. Strain measurement from the strain gauge is partially affected by carrier and adhesive materials and their thickness. In the present work, a Finite Element Model is developed in order to study the effect of both adhesive layer and carrier thickness on strain measurements while using strain gauges. To understand the behavior of the adhesive material, mechanical characterization is done on bulk adhesive specimen. Finite Element Analysis (FEA) is carried out with different materials namely epoxy and polyurethane. Initially a single element foil loop is considered for the analysis and further this is extended to metal foil strain gauge with nine end-loops. Finally, the strain variation through thickness of adhesive layer, carrier and strain sensitive grid is obtained from FEA. The results thus obtained are compared with analytical results from Basic Strength of Materials approach.

Abstract: Strain measurement from the strain gauge is partially affected by carrier and adhesive materials and their thickness. Effect of adhesive layer thickness has been addressed in this paper. Well characterized tensile experiments have been conducted using Al 6061-T6 specimens attached with strain gauges at mid length of the specimen and strain gauges are attached with different materials namely epoxy and polyurethane to understand the effect of adhesive layer thickness in strain measurement. The strain at a location has been noted for one particular adhesive layer thickness value (0.13 mm) and similar experiments have been carried out with different adhesive thickness values (0.16 mm, 0.18 mm and 0.26 mm). The results obtained from experiments have been compared with analytical results from Basic Strength of Materials approach. Good agreement is seen between the experimental and analytical results. It has been observed that the thickness of the adhesive layer plays significant role for getting accurate strain.

Abstract: It has some encouraging results to use ozone in medicaments, treatments and so on. As it is usually in gas state, unstable and strong oxidability, ozone is difficult to be stored and used commonly. It is the key matter in use of ozone commonly or conveniently that the carrier material and preparation response conditions are studied to make the bond strength between ozone and carrier to be felicitous and with the proper velocity to release ozone from the ozonic compound. Ozonic compound and related single molecules were calculated to study the interaction between ozone and carrier to form ozonic compound. The carrier and ozonic compound are designed from the calculations. The stability of the ozonic compound, or the bond strength between ozone and carrier are controlled felicitously to release ozone from the ozonic compound with proper velocity. Ozone antimicrobial can be composed and used conveniently, especially for common families. There are some characteristics of ozone antimicrobial or ozone, such as universal applicability, efficiency and rapidity, security, strong penetrability, no drug resistance and sterilization and treatment simultaneity.

Abstract: The capacity of a microbiological mine water treatment plant may to be enhanced by understanding the microbiological processes. Therefore different samples from the pilot plant were analyzed by culture-independent and cultivation methods. Dominant bacteria could be isolated on overlay plates or enriched in gradient cultures. To immobilize biomass in the pilot plant, various carrier materials were tested. Sessil, the material currently used in the pilot plant, was the most favored and appropriate material.

Abstract: An overview is presented of a multi-year research effort on developing high-rate fluidized-bed bioprocesses for ferric sulfate production to be used as a unit process in various hydrometallurgical applications including indirect tank leaching of ore concentrates, regeneration of heap leach liquors and control of iron containing acidic mine wastewater. Iron oxidation rates of over 26 kg m-3 h-1 were achieved at hydraulic retention times of less than 1 h at 37 °C. Oxygen supply became the rate-limiting factor even with 99.5% dioxygen aeration. Fe2+ oxidation proceeded at pH below 1 even in the presence of 60 g Fe3+ L-1 allowing the regeneration of concentrated ferric sulphate solutions required in indirect tank leaching of sulfidic ore concentrate applications. Of several tested FBR carrier materials activated carbon was the most suitable based on its availability, long-term durability and the achieved high iron oxidation rates. Jarosite precipitates accumulating to the top of the inert carrier materials played an important role in the FBR biomass retainment. For regeneration of synthetic and actual sulfidic ore heap leaching liquors, a gravity settler was installed in the recycle line of the FBR. The system produced iron precipitates with good settling characteristics and settling tank effluent with low turbidity and suspended solids concentrations. These results revealed the potential of FBR process in both heap leach liquor regeneration and controlling the iron containing waste streams. The PCR-DGGE-partial seguencing of the 16S rRNA gene protocol revealed that the FBR culture at 25-37 °C remained dominated by Leptospirillum ferriphilum over a range of operational conditions studied over the years. A modeling approach for managing Fe3+ production by FBR in combination with heap leaching was based on an artificial neural network-back propagation algorithm (ANN-HEAP) and resulted in excellent match between the measured and the predicted concentrations. High-rate fluidized-bed iron oxidation is amenable to regeneration of tank and heap leaching solutions as well as controlling iron containing waste streams.