Performance evaluation of the reactor pattern using the OMNeT++ simulator

The design of large-scale, distributed, performance-sensitive systems presents numerous challenges due to their network-centric nature and stringent quality of service (QoS) require-ments. Standardized middleware implementations provide the key building blocks necessary to address these require-ments of the distributed systems. However, middleware are designed to be applicable for a wide range of domains and applications, which results in system developers requiring to choose the right set of building blocks to design their system. To reduce the impact on development costs and time-to-market, decisions on the right set of building blocks to use in systems design must be made as early as possible in system design. This paper addresses this concern by describ-ing a model-driven systems simulation approach to analyze, catch and rectify incorrect system design decisions at design-time. In this paper we focus on model-driven OMNeT++ simulation of the Reactor pattern, which provides event de-multiplexing and handling capability. Our experience with modeling the Reactor shows that this approach can be ex-tended to the performance analysis of other pattern-based blocks and indeed in the long term to the entire composed middleware framework

Isolation, characterization, and enrichment of soil bacteria capable of metabolizing the triazole fungicide epoxiconazole

Triazole fungicides are widely used in both the agricultural and landscaping industries. As some of these fungicides have been shown to have toxicological effects on organisms besides the target fungi, bioremediation of areas contaminated with triazole fungicides is of interest. In this study, DCC002, a mixture of bacterial species with the ability to utilize the triazole fungicide epoxiconazole as its sole carbon source, was isolated from soil routinely treated with triazole fungicides. Growth of DCC002 was observed on solid media containing epoxiconazole, methanol, and a combination of the two as the sole carbon sources; however, growth in liquid media was only observed in the presence of methanol. Analysis of sequences of the V3 hypervariable region of l6S rDNA indicated that DCC002 is composed of three distinct bacterial species belonging to the genera Labrys, Comamonas, and Pseudomonas/Stenotrophomonas. The Comamonas and Pseudomonas/Stenotrophomonas spp. were obtained as single colony isolates, named DCC002A and DCC002B, respectively. Labrys portucalensis strain Fll, one of the top two BLAST matches for the Labrys sp., was obtained for use as a proxy for the Labrys sp. in further studies. Of these three strains, only Fll could grow on solid medium with epoxiconazole as the sole carbon source. Growth curve studies of these three strains, along with cross-streaking experiments, indicate that while DCC002A and DCC002B rely on the Labrys sp. in order to grow on epoxiconazole, the Labrys sp. does not seem to benefit from this relationship. Given its ability to utilize epoxiconazole as its sole carbon source, the mixture DCC002 has the potential for use in bioremediation

Isolation, characterization, and enrichment of soil bacteria capable of metabolizing the triazole fungicide epoxiconazole

Triazole fungicides are widely used in both the agricultural and landscaping industries. As some of these fungicides have been shown to have toxicological effects on organisms besides the target fungi, bioremediation of areas contaminated with triazole fungicides is of interest. In this study, DCC002, a mixture of bacterial species with the ability to utilize the triazole fungicide epoxiconazole as its sole carbon source, was isolated from soil routinely treated with triazole fungicides. Growth of DCC002 was observed on solid media containing epoxiconazole, methanol, and a combination of the two as the sole carbon sources; however, growth in liquid media was only observed in the presence of methanol. Analysis of sequences of the V3 hypervariable region of l6S rDNA indicated that DCC002 is composed of three distinct bacterial species belonging to the genera Labrys, Comamonas, and Pseudomonas/Stenotrophomonas. The Comamonas and Pseudomonas/Stenotrophomonas spp. were obtained as single colony isolates, named DCC002A and DCC002B, respectively. Labrys portucalensis strain Fll, one of the top two BLAST matches for the Labrys sp., was obtained for use as a proxy for the Labrys sp. in further studies. Of these three strains, only Fll could grow on solid medium with epoxiconazole as the sole carbon source. Growth curve studies of these three strains, along with cross-streaking experiments, indicate that while DCC002A and DCC002B rely on the Labrys sp. in order to grow on epoxiconazole, the Labrys sp. does not seem to benefit from this relationship. Given its ability to utilize epoxiconazole as its sole carbon source, the mixture DCC002 has the potential for use in bioremediation

Techno-economic analysis of green hydrogen storage and transportation pathways

To mitigate climate change and achieve global greenhouse gas emission targets, a great deal of effort is taking place in developing low-carbon solutions in the energy sector. Energy storage technologies are expected to play a crucial role in ensuring energy security by complementing intermittent renewable energy technologies. Green hydrogen is viewed as a promising energy storage solution considering its versatility. However, the lower volumetric energy density at ambient conditions is one of the drawbacks of hydrogen when its storage and transportation are considered. To tackle this problem, multiple promising options are reviewed in this study. This report examined the physical transportation of hydrogen in the form of compressed gas and liquified hydrogen, as well as the storage and transportation of it in chemical form. The latter category includes hydrogen carriers, such as green methanol, green ammonia, and LOHCs. Physical and chemical properties of the said hydrogen vectors, their dehydrogenation and the hydrogenation processes, as well as assumptions related to transportation are investigated in this report. Moreover, different international transportation routes for the import and export of the hydrogen are also considered. The UniSim Design R471 program is used to simulate the hydrogenation and dehydrogenation of the hydrogen vectors in order to determine the precise energy consumption, raw material needs, carrier production rate, etc. The total capital investment cost for each vector is calculated based on the simulations. A MATLAB model is built using the information from the literature research, the outcomes of the UniSim simulations, and the findings of the economic analysis. The MATLAB model's objective is to determine the LCOH for each hydrogen carrier supply chain. The model's finding show that supply networks using compressed hydrogen gas have the highest LCOH, whereas ammonia chains have the lowest LCOH, making them the most economical option. CO2 emission analysis showed that toluene - MCH chain has the highest CO2 emissions. However, both the LCOH and CO2 emissions can be significantly reduced by electrification of the dehydrogenation process.Electrical Engineering | Sustainable Energy Technolog