ALBERT

Description: We investigate in this paper the behaviors of the Riemann solvers (Roe and Harten-Lax-van Leer-Contact (HLLC) schemes) and the Riemann-solver-free method (central-upwind scheme) regarding their accuracy and efficiency for solving the 2D shallow water equations. Our model was devised to be spatially second-order accurate with the Monotonic Upwind Scheme for Conservation Laws (MUSCL) reconstruction for a cell-centered finite volume scheme—and be temporally fourth-order accurate using the Runge–Kutta fourth-order method. Four benchmark cases of dam-break and tsunami events dealing with highly-discontinuous flows and wet–dry problems were simulated. To this end, we applied a reordering strategy for the data structures in our code supporting efficient vectorization and memory access alignment for boosting the performance. Two main features are pointed out here. Firstly, the reordering strategy employed has enabled highly-efficient vectorization for the three solvers investigated on three modern hardware (AVX, AVX2, and AVX-512), where speed-ups of 4.5–6.5× were obtained on the AVX/AVX2 machines for eight data per vector while on the AVX-512 machine we achieved a speed-up of up to 16.7× for 16 data per vector, all with singe-core computation; with parallel simulations, speed-ups of up to 75.7–121.8× and 928.9× were obtained on AVX/AVX2 and AVX-512 machines, respectively. Secondly, we observed that the central-upwind scheme was able to outperform the HLLC and Roe schemes 1.4× and 1.25×, respectively, by exhibiting similar accuracies. This study would be useful for modelers who are interested in developing shallow water codes.

Description: In 2016, the United Nations (UN) launched the 17 Sustainable Development Goals (SDGs) as a framework for sustainable development and a sustainable future. However, the global challenge has been to engage, connect, and empower communities, particularly young people, to both understand and deliver the 17 SDGs. In this study, we show the benefit of a strategic planning-based experiential learning tool, the Young Persons’ Plan for the Planet (YPPP) Program, to improve the underlying competencies of Australian and Mauritian adolescents in increasing understanding and delivering the SDGs. The study was conducted with 300 middle to senior high school students, in 25 schools throughout Australia and Mauritius, over an 18-month period. The intervention included the development of research, strategic planning, management, STEM (Science Technology, Engineering, Maths) and global competency skills in the students, to enable them to build and deliver regional and national SDG plans. Research methods included pre- and post-intervention testing of the attitudes of these students to sustainable development outcomes and compared these attitudes to subsets of scientists and the Australian national population. Our results, from both qualitative and quantitative evidence, demonstrate significant improvements in these adolescents’ appreciation of, and attitudes towards, the SDGs and sustainable outcomes, across a range of key parameters. The results from the 76 students who attended the International Conference in Mauritius in December 2018 demonstrate significant improvements in mean levels of understanding, and attitudes of the students towards the SDGs awareness (+85%), understanding/engagement (+75%), motivation (+57%), and action orientation/empowerment (+66%). These changes were tested across a range of socio-demographic, geographic, and cultural parameters, with consistent results. These findings have significant implications for the challenge of sustainable education and achieving community engagement and action towards the SDGs in Australia and Mauritius, particularly for young people. As the intervention can be replicated and scaled, the findings also highlight the opportunity to extend both the research and this type of experiential learning intervention across both broader geographies and other generation and community segments.

Description: Utilizing a quantitative methodological approach, the present study presented and investigated an integrated model embracing environmental corporate social responsibility, image, emotional attachment, attitude, and moral norms in order to explicate airline patrons’ intention formation for adopting eco-friendly electric airplanes. Our findings revealed that the proposed associations among research constructs were all significant, and that image, emotional attachment, attitude, and moral norms significantly mediated the effect of environmental corporate social responsibility on intention. In addition, the salient role of image of electric airplanes in building intention was uncovered. Despite the importance of greening airline products in the aviation industry, electric airplanes are a topic that has barely been explored. The results of this study can help airline practitioners and researchers to understand consumer readiness and willingness to adopt such eco-friendly alternatives to conventional air-flights. Implications are discussed.

Description: Little is known about cruise passengers’ post-purchase behaviours and what makes them repurchase eco-friendly cruise trips. This research is an empirical attempt to explore the role of cruise line quality, image, physical environment excellence, satisfaction, and awareness of consequences in determining passenger repurchase intentions in the green cruise line sector. A quantitative method that comprised a structural equation model and an invariance test was used. Our findings revealed that quality, image, and physical environment excellence acted as significant drivers of satisfaction and intention, and cruise line quality had the greatest influence on intention. In addition, satisfaction, which was the most proximal determinant of intention, had a mediating effect. The physical environment excellence and intention relationship was moderated by awareness of consequences. The proposed conceptual framework in general had a sufficient level of prediction power for passenger repurchase intention. Findings of this study can be efficiently used for passenger retention among green cruise line practitioners.

Description: Despite the steady growth of the convention tourism industry, little is known about the stimulation of delegates’ green behaviors during their convention travel. This research sought to elucidate delegates’ green behavioral intentions by taking the role of green attitudes, social norms, eco-concern, personal moral obligation, and green behaviors in daily life into account. A quantitative approach employing a survey methodology was utilized for the attainment of research goals. Our results revealed that green attitudes, social norms, eco-concern, and personal moral obligation were significant determinants of delegates’ green behavioral intentions. Among these determinants, eco-concern had a salient effect on delegates’ intention to practice conservation behaviors, whereas personal moral obligation had a prominent role in inducing their willingness to sacrifice. Moreover, our results uncovered that green behaviors in daily life were a moderator in maximizing the influence of green attitudes, eco-concern, and personal moral obligation on the intention to practice conservation behaviors and in maximizing the effect of social norms on the willingness to sacrifice.

Description: With an increasing expected energy demand and current dominance of coal electrification, India plays a major role in global carbon policies and the future low-carbon transformation. This paper explores three energy pathways for India until 2050 by applying the linear, cost-minimizing, global energy system model (GENeSYS-MOD). The benchmark scenario “limited emissions only” (LEO) is based on ambitious targets set out by the Paris Agreement. A more conservative “business as usual” (BAU) scenario is sketched out along the lines of the New Policies scenario from the International Energy Agency (IEA). On the more ambitious side, we explore the potential implications of supplying the Indian economy entirely with renewable energies with the “100% renewable energy sources” (100% RES) scenario. Overall, our results suggest that a transformation process towards a low-carbon energy system in the power, heat, and transportation sectors until 2050 is technically feasible. Solar power is likely to establish itself as the key energy source by 2050 in all scenarios, given the model’s underlying emission limits and technical parameters. The paper concludes with an analysis of potential social, economic and political barriers to be overcome for the needed Indian low-carbon transformation.

Description: In this article, thermal performance of different waste materials and by-products of industrial processes is investigated experimentally. A geopolymer concrete block with 7.5 cm thickness and cross-sectional area of 5 × 5 cm was considered as a reference model to measure heat transmission across the two opposite surfaces while all four remnant surfaces were perfectly insulated. For all other samples, a sandwich concrete block was developed by taking two pieces of the geopolymer concrete with 2.5 cm thickness each on either side and insulation material of 2.5 cm thickness in between. The sandwich materials investigated were air cavity, expanded polystyrene foam, polyurethane foam, rubber tire, date palm, PCM-30, and PCM-42. Experimental investigations revealed that the investigated green materials and industrial by-products have comparable insulation performance with respect to the traditional insulations such as expanded polystyrene foam. It is found that polyurethane foam and date palm can reduce indoor cooling demand by 46.6% each in hot conditions while rubber tire can reduce indoor heating demand by 59.2% in cold climatic conditions at the maximum. The research results confirm and encourage the effective utilization of waste materials in building walls for reducing indoor air-conditioning demand in the extreme climatic conditions.

Description: Agronomy, Vol. 7, Pages 77: Nitrogen Sources and Rates Affect Soybean Seed Composition in Mississippi Agronomy doi: 10.3390/agronomy7040077 Authors: Gurpreet Kaur William Serson John Orlowski Justin McCoy Bobby Golden Nacer Bellaloui Soybean (Glycine max L.) seed is a major source of protein, oil, carbohydrates and other nutrients that are important for human and animal nutrition. Producers have considered applying nitrogen (N) fertilizer to soybean crop to maximize seed yield; however, its effect on seed composition is not well understood. The objective of this two-year (2015 and 2016) study was to evaluate the effects of N fertilizer sources and application rates (45, 90, 135 and 179 kg N ha−1) on soybean seed composition on two soil textures (clay and silt-loam) in Mississippi. The three fertilizer sources included in this study were urea with N-(n butyl) thiophosphoric triamide (Urea+NBPT), polymer-coated urea (PCU), and ammonium sulfate (AMS). Nitrogen application at 179 kg ha−1 on clay soil reduced seed protein by 1.05% compared to unfertilized soybeans in 2016. However, N application at 179 kg ha−1 increased oil content by 0.7% on clay soil compared to the unfertilized soybeans only in 2016. Nitrogen applications reduced stachyose content on both soil textures in 2015. The fatty acids showed variable response to N applications. Since, seed quality is not a trait from which growers receive an economic incentive, they are unlikely to adopt this practice for standard soybean production.

Description: Water resources in the Chia lagoon in Malawi experience a possible threat to sustainability. Communities are seeking alternatives to improve water quality in the lagoon. This study quantified the communities’ willingness-to-pay (WTP) and their influencing factors while using contingent valuation (CV) techniques. A wide range of data collection procedures, including focus group discussions, key informant interviews, field observation, and CV survey, were employed. A sample of 300 households was randomly selected. The CV results showed that 57.4% of the households were willing to pay. The monthly individual aggregate WTP amount ranged from MK696.83 (US$0.95) to MK81697 (US$111.38), and on average MK7870.45 (US$10.73), generating aggregate annual values ranging from MK6, 689,568 (US$9126.29) to MK784, 294,080 (US$1,069,978), and on average MK75,556,320 (US$103,078) (ceteris paribus). Logistic regression model demonstrated a significant (p 〈 0.01 or p 〈 0.05) relationship between demographic (gender, age, literacy level), social-economic (land ownership, main agriculture water source, and income), and institutional (civic education and social network, extension, institutional trust, household socio trust) factors and WTP. The findings from this study provide significant clues for further research and baseline information for local government and communities in the development of more effective and holistic approaches for improving water quality in natural ecosystems.

Description: Community-based tourism is an emerging form of sustainable tourism. Community-based tourism often brings various financial/non-financial benefits to local communities and maximizes sustainability at the local level. The present study was designed to uncover the role of community-based tourism performance in elucidating travelers’ post-purchase decision-making process for sustainable destination products by considering the moderating effect of sense of belonging. A quantitative approach was adopted for the achievement of the research objective. A field survey conducted at community-based tourism destinations was utilized for data collection. The acceptable level of the measurement quality was demonstrated. The results of the structural equation modeling provided empirical evidence that community-based tourism performance significantly affects the formation of travelers’ post-purchase intentions. In addition, the adequacy of the higher-order structure of community-based tourism performance was identified. The community-based tourism performance and intention relationship was also moderated by sense of belonging. With a lack of empirical research about community-based tourism, the findings of this research significantly add to the existing body of knowledge in sustainable tourism.