Rethinking assessment of drought impacts: a systemic approach towards sustainability

Although impacting primarily economic sectors, droughts may also initiate dynamic mechanisms that have socio-environmental consequences on sustainability of the impacted areas. To date, most research has dealt with the economic impacts of droughts, with minimal attention being paid to the dynamics of damaging mechanisms associated with socio-environmental impacts. Using a systemic approach, this paper develops a method of identifying the dynamic structures responsible for the consequences of drought. Considering the impacts of recent droughts in Iran, the paper presents a conceptual model, underpinned by a Limits to Growth archetype to explain how different drought impacts are triggered. Moreover, adopting the Viability Loops concept, a range of strategies and indices are suggested as monitoring tools to sustain socio-economic life in a drought-impacted area. The provinces of Hamadan (with water abundance), and Yazd and Isfahan (with water scarcity) in Iran have been selected to illustrate the proposed methodology. Results show a higher vulnerability to droughts in the water-rich region due to dependence on water abundance as opposed to the water-poor regions, which are well adapted to water scarcity conditions.     

Presenting a conceptual pattern of HSE performance of oil trucks

Accidents are among the main problems in the oil product supply chain. The most important effective factors in these events are the kind of trucks used and their health, safety, and environment (HSE) condition. The aim of this study was to present a conceptual pattern of the HSE performance of oil trucks in oil industries. In this study, 20 truck models (with fixed tanks), in use over different periods of time, were investigated. In this regard, the criteria and sub-criteria were first determined in two parts—carrier and tank—and weighted by fuzzy analytical hierarchy process (FAHP). The results showed that the most important sub-criteria regarding the HSE factors of the carrier were resistance and strength of the front and rear shields, the brake system, and the ventilation system. The most important sub-criteria regarding the HSE factors of the tank were tank shell thickness and a good tank design shape with respect to portable material. It should be noted that the weight of the criteria with each other and sub-criteria with each other are not equal. This issue is important for decision-making. The main reason for the use of trucks with the lowest score in developing countries is the lack of attention by managers to safety issues and international standards and agreements such as the ADR.     

A rapid determination of histamine and 3-methylhistamine in human plasma by high performance liquid chromatography

Histamine plays an important pathophysiological role in allergy, inflammation, gastric acid secretion, microcirculation and neurotransmission. 3-Methylhistamine is a prominent metabolite of histamine. Different methods for determination of histamine in biological fluids have been developed. In the present study, a simple, simultaneous determination of histamine and 3-methylhistamine by HPLC (precolumn derivatization with fluorescamine) was developed in human plasma using fluorescence detection with 1-methylhistamine as the internal standard. Linear regression analysis of the ratios of the concentrations of histamine and 3-methylhistamine (X) against peak height ratios (Y) yielded the following: y = 0.0073x ? 0.0096 (R ² = 0.990) and y = 0.0077x ? 0.0111 (R ² = 0.989). In conclusion, it was possible to detect histamine and 3-methylhistamine below 5 ng mL^?1 in 1 mL plasma.     

Thermal Stabilization of Recycled PET Through Chain Extension and Blending with PBT

This study investigates the effect of using a multifunctional epoxide chain extender (Joncryl^® ADR 4468) on the thermal stabilization and rheological properties of recycled polyethylene terephthalate (R-PET) and its blends with polybutylene terephthalate (PBT). The R-PET samples were prepared without and with chain extender (CE) contents of 0.4 wt% and 0.8 wt%. R-PET/PBT blends with weight ratios of 75w/25w, 50w/50w and 25w/75w were also prepared without and with a given CE content of 0.2 wt%. The thermal stability of the melt blended samples was analyzed through small amplitude oscillatory shear (SAOS) rheological experiments. The structure of the samples was evaluated using a Fourier transform infrared (FTIR) spectrometer. While the dynamic rheological properties of R-PET were improved with the addition of Joncryl and by blending with PBT, during the SAOS rheological experiments, the complex viscosity of R-PET further increased due to the concurrent polycondensation of R-PET and the resumption of Joncryl reaction with R-PET molecules. These reactions during the rheological experiments were further expedited with increasing the testing temperature. On the other hand, in R-PET/PBT blends, the reactivity of Joncryl was more noticeable in blends with higher R-PET contents due to the higher available internal reactive sites of much shorter R-PET molecules. It was observed that the addition of only 0.2 wt% Joncryl to the blends of R-PET/PBT (75w/25w) dramatically improves the thermal stability and dynamic rheological properties of R-PET and most likely its processability.

     

Factors affecting the adoption of collective pressurized irrigation systems

Environment, Development and Sustainability - The collective pressurized irrigation system (CPIS), by definition, is expressed as a process of implementing unified pressurized irrigation systems on...