bluuebunny/crossref_metadata_2025 huggingface dataset:
Quality Distinguish of Red Ginseng from Different Origins by HPLC–ELSD/PDA Combined with HPSEC–MALLS–RID, Focus on the Sugar-Markers
Authors: Cheng Qian , Peng Shuhuan , Li Fangyi , Cui Pengdi , Zhao Chunxia , Yan Xiaohui , Suo Tongchuan , Wang Chunhua , He Yongzhi , Li Zheng
Published: October 2021

Red ginseng (RG) has been extensively utilized in Asian countries due to its pharmacological effects. For the quality evaluation of RG, small molecules, such as ginsenosides, have been widely considered as candidates of its quality markers (Q-markers), and various analytical techniques have been developed in order to identify these compounds. However, despite the efforts to analyze the hydrophobic constituents, it is worth pointing out that about 60% of the mass of RG is made of carbohydrates, including mono-, oligo- and polysaccharides. Consequently, the quality differentiation and identification of RG from the perspective of sugar-markers should be focused. High performance liquid chromatography and evaporative light scattering detector (HPLC–ELSD) method for the determination of disaccharides in RG was established. Furthermore, high performance size exclusion chromatography–multi-angle laser light scattering–refractive index detector (HPSEC–MALLS–RID) for the determination of molecular weight and high performance liquid chromatography photodiode array (HPLC–PDA) for the determination of compositional monosaccharides in RG polysaccharides were also established. HPLC–ELSD/PDA combined with HPSEC–MALLS–RID could be used to determine the contents of disaccharides, molecular weights, and compositional monosaccharides of RG polysaccharides, which could be used for quality control, and this is a new view on the sugar marker to quality differentiation of various origins of RG.
Understanding the Use of Timber in Semi-Arid Regions: Kurdistan Region of Iraq, a Case Study
Authors: Abdulwahid Mohanad Yaseen , Galobardes Isaac , Radoine Hassan
Published: October 2021

The use of timber in the building industry has expanded in many countries over the last 20 years due mainly to its light weight, low adverse impact to the environment, and fair mechanical properties. Despite the development of the construction industry in the Kurdistan Region in Iraq (KRI) in recent years, timber product utilization is still very limited. Therefore, the purpose of this study was to investigate the feasibility of further utilizing timber-based products in the building industry in semi-arid regions using the KRI as a case study. A review of timber product utilization in the region was conducted first and the general properties of timber products were followed. Based on this, a survey focusing on the current situation and suitability of localized grown timber products was carried out to study the feasibility. This article concludes that the use of timber-based products in the KRI presents different barriers, with the availability in the market and technicality of construction with the material being the strongest ones. The article recommends that it is imperative to further research how to promote timber’s utilization in the KRI to be in line with sustainable development.
A Research by Design Strategy for Climate Adaptation Solutions: Implementation in the Low-Density, High Flood Risk Context of the Lake District, UK
Authors: Psarra Ifigenia , Altınkaya Genel Özlem , van Spyk Alex
Published: October 2021

The purpose of this paper is to propose a research by design strategy, focusing on the generation of innovative climate adaptation solutions by utilizing the Design Thinking Process. The proposed strategy has been developed and tested in a research and design studio, which took place in 2020 at a Master of Architecture degree program in the Netherlands. The studios focused on the sparsely populated, high flood risk region of the Lake District, UK. The Lake District faces urgent climate change challenges that demand effective solutions. On the other hand, the area is a UNESCO heritage site, characterized by massive tourism and tending towards museumification (sic). Three indicative design research projects were selected to illustrate the proposed research by design strategy. The results reveal that this strategy facilitates the iterative research by design process and hence offers a systematic approach to convert the threats of climate change into opportunities by unraveling the potentials of the study area. The findings lay the groundwork for more systematic studies on research by design as an effective strategy for climate change adaptation design. Beyond the local case, the results contribute to the critical theories on climate adaptation design and research by design methodologies.
Relations of COVID-19 and the Risk Management Framework
Authors: Klucka Jozef , Gruenbichler Rudolf , Ristvej Jozef
Published: October 2021

The routine approach used in risk management is based on the scheme that within the prevention period an organisation or a state prepares for the expected risks and once the risks occur, resources and internal procedures are implemented to mitigate their negative consequences. The objective of the paper is to analyse risk management and its constraints, its application in COVID-19 period and based on it provide mitigating strategies for specific problems/risks related to COVID-19. The research methods related to the topics are: (a) study of books, newspapers and other internet resources and (b) interviews with COVID-19 managers at district and regional level in the north of Slovakia. The proposals for mitigation strategies are based on the basic assumption relevant for COVID-19 that there are risks with unknown probability and unknown consequences. Therefore, the mitigation strategies are adapted to the current situation, which includes lack of data and know-how, lack of experience, political and economic unrest and social problems. The impact of constraints is based on an ad-hoc or unplanned and clearly structured approach. Problems and risks are identified and mitigation strategies are proposed. The proposed measures (quantitative/qualitative) should be evaluated and via benchmarking the development and efficiency of applied measures monitored and assessed. The output of identified risk-known and –unknown creates a framework for implementation.
Corporate Social Responsibility Development and Climate Change: Regional Evidence of China
Authors: Li Shouhao , Cheng Weiquan , Li Jingjing , Shen Hao
Published: October 2021

This study analyzed Chinese companies’ behavior regarding corporate social responsibility (CSR) disclosure, and its impact on national and regional climate change measured by carbon emissions. CSR disclosure, supported by existing theories, is considered a powerful tool to curb climate change issues. We combined data of companies’ publicly traded annual financial reports and CSR reports from the China Stock Market and Accounting Research (CSMAR) database and provincial macroeconomic statistics from the Chinese National Bureau of Statistics to run panel regressions. The results verify the following: (a) China is in a relatively early stage of CSR development, and Chinese firms’ internal incentives to adopt CSR projects are low since none of the internal factors researched contribute to CSR disclosure. (b) External factors work slightly better for CSR practices, but at the same time, the CSR regulations still need further improvement. (c) The current CSR disclosure practices do not have a clear impact on carbon emission reduction, contrary to some predictions that CSR could help reduce carbon emissions.
Place-Related Concepts and Pro-Environmental Behavior in Tourism Research: A Conceptual Framework
Authors: Dang Nam Hoai , Maurer Oswin
Published: October 2021

The negative impacts of tourism development are increasing environmental problems related to the destruction of the global environment, calling on scholars and practitioners to look more at the relationship between people and place. In this concern, place attachment has attracted wide interest, especially from environmental psychologists, to investigate this relationship. This paper presents different approaches to analyze place attachment and related concepts to determine pro-environmental behavior in tourism consumption. It identifies critical gaps in the literature and extends existing theoretical frameworks by considering additional factors, and the entire process from input (participation), through mediations (attachment, meanings, satisfaction) to output (behavior). It reviews the definition of place attachment and essential place-related concepts and outlines why the suggested framework is necessary to extend the current body of research in people–place relationships. It also broadly evaluates current scales and measurement models of constructs included and the structural model of this framework, thereby making recommendations relevant for subsequent empirical research. Finally, contributions to theory, limitations, and suggestions are discussed.
Managerial Competencies & Polish SMEs’ Response to the COVID-19 Pandemic: An Insight
Authors: Bodziany Marek , Ścibiorek Zbigniew , Zamiar Zenon , Visvizi Anna
Published: October 2021

The COVID-19 pandemic and its implications have had a devastating impact on the business sector worldwide, especially on the SMEs’ sector. By highlighting the evolution, and so the specificity, of the Polish SMEs’ sector, by reference to the concept of learning organization, this paper queried the sources of the Polish SMEs’ unsatisfactory response to the COVID-19 pandemic and its implications. A survey (n = 147) conducted among a sample of Polish SMEs revealed that the Polish SMEs, in general, did not recognize the salience of managerial skills in building their capacity to withstand a crisis. Creating growth opportunities, rather than accumulating and operationalizing their organization’s knowledge, were stressed as the way of navigating challenges. This paper offers an insight into selected factors that influenced Polish SMEs’ sector during the COVID-19 pandemic, and suggests some ways of addressing problems thus identified.
Impact of Energy Price Stabilization Mechanism on Regulated Clients’ Tariffs: The Case of Chile
Authors: Fredes Humberto Verdejo , Acosta Benjamin , Olivares Mauricio , García-Muñoz Fernando , Tobar Francisco , Toro Vannia , Smith Cesar , Becker Cristhian
Published: October 2021

The Chilean socio-political explosion in October 2019 embodies a milestone in Chile’s national history, challenging the current government’s administration and the management of state resources. One of the triggering factors of this crisis was the increase in electricity prices for those clients previously subject to flat pricing. As an example, in 2019, electricity fees increased by 25% at the national level. In order to solve the conflict, the Ministry of Energy proposed a mechanism, applicable for two years, which would freeze energy charges for companies, industries and domestic customers subject to a regulated tariff. This mechanism was employed and would produce a debt favoring generation companies, which could not exceed CLD 1.350 million. This article analyzes the effectiveness of the energy price stabilization mechanism and the effects of the Chilean socio-economic instability—resulting from the aggregated debt generated by the mechanism applicability—on the exchange rate over its duration of operation. The results suggest that the effects of the current law will not fulfill the purpose of tariff stabilization until 2024; additionally, there will be a sustained increase in tariffs until the year 2027.
Influence of Feedstock and Final Pyrolysis Temperature on Breaking Strength and Dust Production of Wood-Derived Biochars
Authors: Videgain María , Manyà Joan J. , Vidal Mariano , Correa Eva Cristina , Diezma Belén , García-Ramos Francisco Javier
Published: October 2021

The susceptibility to fragmentation of biochar is an important property to consider in field applications. Physical and mechanical properties of wood-derived biochars from vine shoots and holm oak were studied to evaluate the effect of biomass feedstock, final pyrolysis temperature and application conditions. Vine shoots and holm oak pruning residues were selected for biochar production. Slow pyrolysis experiments were conducted at two different final temperatures (400 and 600 °C). Physical and chemical characteristics of biomass and biochars were determined. Impact strength was evaluated through the measurement of the gravitational potential energy per unit area (J mm−2) necessary for the breakage of biochar fragments. Shear strength (N mm−2) and a combination of shear/compression strengths (N) were analyzed using a Universal Texture Analyzer. A particular mechanical treatment was carried out on biochar samples to simulate the processing bodies of a commercial manure spreader, under two gravimetric moisture contents. Holm oak-derived biochar was more resistant than vine shoot-derived biochar to the applied forces. Vine shoots-derived biochar did not show a significantly different mechanical behavior between temperatures. Holm Oak-derived biochar produced at the higher final pyrolysis temperature showed higher resistance to be broken into smaller pieces. Moistening resulted in an adequate practice to improve mechanical spreading.
Projecting More Sustainable Product and Service Designs
Authors: Muñoz López Natalia , Valero Martín Jose Ignacio , Biedermann Anna , Santolaya Sáenz Jose Luis , Fernández-Vazquez Aranzazu
Published: October 2021

Product and service development based on sustainable criteria is one of the poles of innovation in design activity. Public policies, consumer preferences, and corporate social responsibility lead to the growing importance of applying sustainability principles in the current design process. However, to make this practice widespread, sustainability assessment must be included in the curricula of bachelor’s and master’s degrees in design, so that the graduates have the precise tools to use when they start their professional careers. Furthermore, sustainable design methods have mainly been applied to improve only the environmental behavior of products. In this work, a methodology that simultaneously evaluates environmental, economic, and social aspects was applied to project more sustainable designs of products and services. This approach was implemented in higher education to develop Bachelor’s and Master’s degree final projects by design engineering students. Collaboration with different companies and institutions allowed the study of a number of cases. The production process of a cash management machine, the service provided by a public nursery school, and the development of an itinerary exhibition were addressed. In each case, product and service requirements were analyzed, sustainability indicators were obtained, and more sustainable designs could be proposed. This experience is also part of a global strategy at the University of Zaragoza to support the implementation of the UN’s Sustainable Development Goals, enhancing sustainability education. The intention of this paper is to present a methodology for more sustainable design, and examples of its application that other teachers can easily follow when teaching design of products or services.
Triggering Active Communities for Cultural Creative Cities: The “Hack the City” Play ReCH Mission in the Salerno Historic Centre (Italy)
Authors: Cerreta Maria , Daldanise Gaia , La Rocca Ludovica , Panaro Simona
Published: October 2021

According to the current European scenario, cultural, creative, and community-led policies play an increasingly important role in influencing local resources, systems, and infrastructures management and demand a novel approach in governing, financing, and monitoring urban regeneration processes. Therefore, cities become contexts where cultural and creative practices can be implemented, integrating social cohesion principles based on communities, shared values, and collaborative decision-making approaches, with particular attention to enhancing cultural heritage, mainly unused or underutilised. The purpose of this research is to explore how the Cultural and Creative Cities Monitor (CCCM) methodological framework, developed by the Joint Research Centre of the European Commission, can be integrated at the local scale to assess the impacts of urban regeneration processes in an interactive and dynamic way, through the data emerging from the monitoring of urban regeneration experiences activated with the communities. The paper describes the “Play ReCH (Re-use Cultural Heritage)” approach, that promotes a process of collaboration, gamification, and innovation in cultural heritage reuse, as an opportunity to test how cultural, creative, and community-led urban strategies can support the enhancement of heritage generating enabling environments and culturally vibrant contexts. The Play ReCH approach and the “Hack the City Salerno” mission, activated in the Salerno historic centre (Italy), open the reflection on some relevant issues related to how citizens become makers of cultural and creative cities’ policies, and contribute to evaluating and monitoring their implementation at diverse urban scales. The Play ReCH mission underlines how new evidence suggests declining the CCCM conceptual framework and related urban policies assessment, co-defining suitable community-based indicators.
Location-Routing Optimization with Renting Social Vehicles in a Two-Stage E-Waste Recycling Network
Authors: Zheng Feifeng , Sun Zhiyu , Liu Ming
Published: October 2021

E-waste recycling has been a hot topic in recent years. The low efficiency and high-operation cost of recycling make it more important to build perfect e-waste recycling networks. To hedge against the limitation of vehicle resources being often neglected in existing research, we propose a mixed integer linear programming model of e-waste recycling by renting idle social vehicles. In the model, both decisions made on the location selection of recycling sites and vehicle routings satisfying all of the demand nodes over the network within time windows are required to minimize the total operating cost. An improved genetic algorithm and heuristic algorithm are designed to solve the model, and numerical experiments are produced to demonstrate the effectiveness of the proposed model and algorithms.
Identifying the Development Potential for Urban Integration Based on Transport Accessibility—The Case for Northeast China
Authors: Gou Yichao , Wang Chengjin , Dang Yi
Published: October 2021

Urban integration, a new concept in urban and regional research, is an inevitable outcome of urban development. Based on accessibility analysis, this study uses urban and road network data to identify urban pairs in Northeast China which meet the distance threshold for urban integration and establishes an index system to evaluate the development potential. The research shows that in Northeast China, the results for urban integration are similar to those for the present urban structure in China, that is, a spatial pattern with provincial capital cities at the core and an urban belt as the axis. According to the evaluation, areas with potential for urban integration may be classified into four categories, namely, dominant areas, key areas, ordinary areas, and alternative areas. The candidate and potential areas for urban integration tend to be concentrated near a provincial capital city or a regional development zone. The results show that the development potential for urban integration varies greatly among the different urban pairs and the main constraining factors are different for each location. Among the constraining factors, the commuting time, costs, and economic conditions for the citizens are the most important.
Non-Sewered Sanitation Systems’ Global Greenhouse Gas Emissions: Balancing Sustainable Development Goal Tradeoffs to End Open Defecation
Authors: Shaw Kelsey , Kennedy Christopher , Dorea Caetano C.
Published: October 2021

Discharge of excreta into the environment and the use of decentralized sanitation technologies, such as septic tanks, pit latrines and ecological sanitation variants (i.e., container-based sanitation), contribute to greenhouse gas (GHG) emissions but have remained poorly quantified. The purpose of this analysis was to investigate the impacts that meeting Sustainable Development Goal (SDG) 6.2 (i.e., ending open defecation by 2030) would have on SDG 13 (i.e., combatting climate impacts). The current Intergovernmental Panel on Climate Change GHG estimation methodology was used as the basis for calculations in this analysis, augmented with improved emission factors from collected data sets for all types of on-site sanitation infrastructure. Specifically, this assessment focused on the three different service levels of sanitation (i.e., improved, unimproved and no service) as defined by UNICEF and WHO as they pertain to three Shared Socioeconomic Pathways. This analysis considered the 100-year global warming potential values in carbon dioxide equivalents of methane and nitrous oxide that can be emitted for each scenario and decentralized sanitation technology. Ultimately, six scenarios were developed for various combinations of pathways and sanitation technologies. There was significant variability between the scenarios, with results ranging from 68 Tg CO2eq/year to 7 TgCO2eq/year. The main contributors of GHG emissions in each scenario were demonstrated to be septic tank systems and pit latrines, although in scenarios that utilized improved emission factors (EFs) these emissions were significantly reduced compared with those using only standard IPCC EFs. This analysis demonstrated that using improved EFs reduced estimated GHG emissions within each SSP scenario by 53% on average. The results indicate that achieving SDG sanitation targets will ultimately increase GHG emissions from the current state but with a relatively small impact on total anthropogenic emissions. There is a need for the continued improvement and collection of field-based emission estimations to refine coarse scale emissions models as well as a better characterization of relevant biodegradation mechanisms in popular forms of on-site sanitation systems. An increase in the understanding of sanitation and climate change linkages among stakeholders will ultimately lead to a better inclusion of sanitation, and other basic human rights, in climate action goals.
Postharvest Quality Evolution in Long Shelf-Life “Vesuviano” Tomato Landrace
Authors: Parisi Mario , Lo Scalzo Roberto , Migliori Carmela Anna
Published: October 2021

“Vesuviano” or “piennolo” tomato is among the most famous Italian small tomato landraces and is cultivated on the slopes of Vesuvio volcano (Southern Italy). The “piennolo” tomato is an interesting case with regard to its potential sustainability, as it is traditionally grown in water-deficit conditions with a low fertilizer input. Fruits with a high firmness and a thick skin can be stored for 3–4 months at room temperature (“long shelf-life” or LSL tomato) without postharvest fungicide applications. The aim of this research was to study the retention, changes in quality, and nutritional traits of “Vesuviano” tomatoes over 120 days of “natural” storage. The dry matter, soluble sugar, organic acids, volatile compounds, and carotenoid contents were evaluated at harvesting and in fruits stored for 40, 80, and 120 days. Slight decreases in dry matter content, soluble sugars, and sweetness index were found, while the organic acids levels remained relatively stable. Moreover, interesting increases in the concentrations of certain flavor volatiles, alcohols, aldehydes, and terpenes were detected. Regarding carotenoids, the total lycopene levels exhibited a 1.5-fold increase from harvest to 120 days. The unchanged lycopene cis-isomer levels and the β-carotene/total lycopene ratio is characteristic of relatively stable isomerization activity and indicated an optimal ripening pattern up until the end of the “natural” storage period. These results, which demonstrate good overall quality retention of this LSL tomato, represent a well-grounded reason to enhance the cultivation and marketing of this genetic resource, the fruits of which can be appreciated by consumers during the winter–early spring, when high-quality fresh tomatoes are not available on the markets.
Engaged Intermediaries to Bridge the Gap between Scientists, Educational Practitioners and Farmers to Develop Sustainable Agri-Food Innovation Systems: A US Case Study
Authors: Cardona Aurélie , Carusi Cristiana , Bell Michael Mayerfeld
Published: October 2021

This article analyses the role of intermediaries’ engagements to bridge the gaps between research, education and practice in the processes of knowledge production needed for the shift to sustainable agri-food systems. It is based on an immersive study of an intermediary organization in the USA, including comprehensive interviews with the staff of the organization about their professional activities, their career paths, their close and longstanding professional relationships, and their values. Three characteristics of engaged intermediaries are identified, which can be positive add-ons for bridging activities: they consider farmers and scientists as equal contributors to the production of knowledge; they are involved in multiple life-worlds: for instance, being both a farmer and an outreach specialist or scientist; and they are closely associated with movements furthering the development of local and sustainable agri-food systems and an equitable sharing of knowledge. The article addresses topics often neglected in the innovation systems literature: the experience, social relations and political engagement of intermediary actors.
An Efficient Method for Capturing the High Peak Concentrations of PM2.5 Using Gaussian-Filtered Deep Learning
Authors: Yeo Inchoon , Choi Yunsoo
Published: October 2021

This paper proposes a deep learning model that integrates a convolutional neural network with a gate circulation unit that captures patterns of high-peak PM2.5 concentrations. The purpose is to accurately predict high-peak PM2.5 concentration data that cannot be trained in general deep learning models. For the training of the proposed model, we used all available weather and air quality data for three years from 2015 to 2017 from 25 stations of the National Institute of Environmental Research (NIER) and the Korea Meteorological Administration (KMA) observatory in Seoul, South Korea. Our model trained three years of data and predicted high-peak PM2.5 concentrations for the year 2018. In addition, we propose a Gaussian filter algorithm as a preprocessing method for capturing high concentrations of PM2.5 in the Seoul area and predicting them more accurately. This model overcomes the limitations of conventional deep learning approaches that are unable to predict high peak PM2.5 concentrations. Comparing model measurements at each of the 25 monitoring sites in 2018, we found that the deep learning model with a Gaussian filter achieved an index of agreement of 0.73–0.89 and a proportion of correctness of 0.89–0.96, and compared to the conventional deep learning method (average POC = 0.85), the Gaussian filter algorithm (average POC = 0.94) improved the accuracy of high-concentration PM2.5 prediction by an average of about 9%. Applying this algorithm in the preprocessing stage could be updated to predict the risk of high PM2.5 concentrations in real time.
Students’ Perspective on Remote On-Line Teaching and Learning at the University of Latvia in the First and Second COVID-19 Period
Authors: Baranova Sanita , Nīmante Dita , Kalniņa Daiga , Oļesika Alise
Published: October 2021

In Spring 2020, due to the rapid spread of COVID-19, all educational institutions in Latvia, including the University of Latvia (UL), transitioned from face-to-face on-site learning to remote learning. After a short period of face-to-face on-site learning in autumn, UL returned to remote learning in November for the second time. This paper investigates the UL students’ perspectives on remote teaching and learning at the UL during the first and second COVID-19 periods. The research assesses several remote study organization aspects, including the lecturer’s and student’s digital skills, their access to information and support during the study process, planning and implementation of the study process, and students’ acquisition of the content. The study used an original questionnaire designed in the Spring 2020 semester. Seven questions from the first questionnaire were included in another follow-up questionnaire distributed in the Spring 2021 semester. A total of 2248 UL students from the Spring 2020 semester and 742 students from the Spring 2021 semester participated in the study, representing 13 faculties across all study levels. The survey responses were collected via a QuestionPro survey platform and then downloaded into an IBM SPSS 28 file for a reliability check. Next, descriptive statistical analyses were conducted for each reported survey item using Microsoft Excel 2016. The research presented here implies that, in general, students perceive positive improvements in almost all the investigated aspects of the organization of the remote study process when comparing the first and second COVID-19 periods, which could indicate a certain level of resilience in students and university lecturers when subject to COVID circumstances. However, the results reveal that students have, in one year, developed a more realistic approach in assessing their digital skills. The results lead us to believe that remote on-line learning is not just a short-term solution but could become a valuable element for providing qualitative education in the long term. It could indicate that the students and lecturers at university are ready for new and sustainable higher education study organization solutions in the future.
A Practice in Valuation of Ecosystem Services for Local Policymakers: Inclusion of Local-Specific and Demand-Side Factors
Authors: Hayashi Takashi , Kunii Daisuke , Sato Masayuki
Published: October 2021

Although researchers expect the valuation of ecosystems and their services to be used in various decision-making processes, some studies have insisted that the valuation results cannot be fully used in the real world. The so-called “information gap” was highlighted, and some reasons for the gap were raised by researchers. One of them is the lack of local-specific and demand-side information, such as who receives the benefits and to what extent. This study proposes a valuation that includes demand-side information for it to be practically useful for policy decision making, especially for local policymakers. We focus on the headwater conservation service of the forest ecosystem by referring to the case of constructing solar power plants in the Satetsu-gawa river basin in Ichinoseki, Japan. We estimate the size of the area and the number of households affected by deforestation caused by the construction of the plants. Furthermore, the lost value of ecosystem services is assessed in monetary terms to reflect information on the demand side. Based on the results, we present multiple indicators for assessing the impact of constructing the plants and discuss how the valuation can be used by local policymakers as well as how it can close the information gap.
Enhancement of Pigments Production by Nannochloropsis oculata Cells in Response to Bicarbonate Supply
Authors: Salbitani Giovanna , Del Prete Francesco , Carfagna Simona , Sansone Giovanni , Barone Carmela M. A.
Published: October 2021

In this study, the effects of bicarbonate addition on growth and pigment contents of the unicellular microalga Nannochloropsis oculata, were evaluated. N. oculata represents an interesting source of biomolecules widely used for food supplements and nutraceuticals. The bicarbonate was supplemented to microalgae cultures at concentrations of 0, 6, 18, 30, 42 and 60 mM. The cultures supplemented with salt at highest concentrations (42 and 60 mM) showed a significant increase in algal growth, demonstrated by the optical density spread. The intracellular content of pigments such as chlorophyll a and total carotenoids reached the highest values in cells from cultures supplied with bicarbonate. In fact, concentrations of bicarbonate from 30 to 60 mM strongly improved, for a short period of only 72 h, the cellular levels of chlorophylls and carotenoids. These are interesting pigments with commercial applications. The utilization of bicarbonate could represent an interesting sustainable opportunity to improve microalgae cultivation for cellular growth and pigment contents.
Removal of Fe(III), Cd(II), and Zn(II) as Hydroxides by Precipitation–Flotation System
Authors: Zapién Serrano Leonor , Ortiz Lara Noemí , Ríos Vera Rafael , Cholico-González Diana
Published: October 2021

In this paper, a combined precipitation–flotation system is proposed for the removal of Fe(III), Zn(II), and Cd(II) as hydroxides. The efficiency of precipitation, as a function of pH, metal ion concentration, and dosage of the precipitating agent as the main variables, was evaluated. The results showed that 99% efficiency was attained from a mixture solution containing the three metal ions in sulfate media at pH 10.3 after 15 min of treatment. The sedimentation behavior showed that a larger precipitate facilitated solid/liquid separation at 30 min. The characterization of precipitates was performed by X-ray diffraction (XRD) identifying iron, zinc, and cadmium oxides; hydroxides; and sodium sulfate. For the flotation, a 20 mg/L solution of dodecylamine (DDA) was used as a collector. Such a solution allowed for the removal of 76% of precipitates in concentrate. An increase in the collector concentration diminished the float percentage due to the micelle formation and low adsorption of the collector on the surface of the precipitate. The results provide evidence of the effectivity of the removal of metal ions by the combined precipitation–flotation system as an alternative for the treatment of acid mine drainage (AMD) in less time in comparison with a sedimentation stage.
Fermentation of Palm Oil Mill Effluent in the Presence of Lysinibacillus sp. LC 556247 to Produce Alternative Biomass Fuel
Authors: Mohammad Sharifah , Baidurah Siti , Kamimura Naofumi , Matsuda Seitaro , Bakar Nurul Alia Syufina Abu , Muhamad Nik Nur Izzati , Ahmad Aizat Hisham , Dominic Debbie , Kobayashi Takaomi
Published: October 2021

A bacterial strain, identified as Lysinibacillus sp. LC 556247 POME, was isolated from palm oil mill effluent (POME). The present article highlights the potential utilization of POME as a sole fermentation medium by Lysinibacillus sp. LC 556247 to produce biomass fuel via aerobic fermentation. The fermentation was performed in a shake flask with a working volume of 300 mL, agitated at 180 rpm, incubated at 35 ± 2 °C for various fermentation hours, ranging from 1, 2, 3, 4, 24, 48, 72, 96, and 120 h, and was followed by a drying process. Elucidation of the POME characteristics, calorific energy values (CEV), moisture content (MC), oil and grease content, chemical oxygen demand (COD), biochemical oxygen demand (BOD), dissolved oxygen (DO), total suspended solids (TSS), pH, total nitrogen, and the colony-forming unit (CFU) were performed. The results demonstrate that the highest CEV, of 21.25 ± 0.19 MJ/kg, was obtained at 48 h fermentation. High amounts of extractable oil and nitrogen content were retrieved at the highest CEV reading of the fermented and dried POME samples, which were 17.95 ± 0.02% and 12.80 ± 0.08%, respectively. The maximum removal efficiencies for the COD (50.83%), the BOD (71.73%), and the TSS (42.99%) were achieved at 120 h of fermentation, with an operating pH ranging from 4.49–4.54. The XRF analysis reveals that the fermented and dried products consisted of elements that had a high amount of carbon and potassium, and a significantly low amount of silica, which is sufficient for the effective burning of biomass fuel in the boiler.
Benefits or Risks: What Influences Novice Drivers Regarding Adopting Smart Cars?
Authors: Alshaafee Areej Ahmad , Iahad Noorminshah A. , Al-Sharafi Mohammed A.
Published: October 2021

Level 4 autonomous vehicles (AVs) are smart vehicles that can move between two different points without any human interference. In 2018, the Saudi Arabian ban on female drivers was finally lifted, resulting in a large number of novice women drivers of different ages. The Kingdom might therefore be considered a risky place to drive, but AVs would help novices to reduce their fear of driving and reduce accidents. Previous studies focused narrowly on those who already had sufficient driving experience and held a valid driving license, but there were no studies on the adoption of smart cars by novice drivers. Based on a literature search, no studies had used a net valence model (NVM) for the adoption of AVs to understand their benefits/risks. Therefore, this study proposed an adoption model for AVs using an NVM to identify the benefit and risk factors that have an impact on beginner drivers’ adoption of autonomous vehicles. A survey method was applied using the purposive sampling technique. Data were collected from 1400 female Saudi novice drivers who had experience with driving AVs. Data analysis was performed using Smart PLS Version 3. The results showed that individuals tended to ignore potential risks and focus instead on the potential benefits of using AVs. Performance expectancy, enjoyment, and effort expectancy were found to be positively related to the perceived advantages. On the other hand, the perceived risk as a construct did not have an impact on beginner drivers’ adoption of autonomous vehicles. Therefore, the major theoretical contribution of this study was the formation of a new NVM model by incorporating three more constructs, which were social influence, personal innovativeness, and alternatives. Finally, the enhanced NVM model could assist AV developers in identifying the expected benefits and drawbacks of AV adoption.
Experiences of Polish Tourists Traveling for Leisure Purposes during the COVID-19 Pandemic
Authors: Balińska Agata , Olejniczak Wioletta
Published: October 2021

The research presented in this paper examines the experiences of Poles traveling for leisure purposes in the summer season of 2020, taking into account the context of the COVID-19 pandemic. The study involved the analysis of source data, including statistical data, and a survey administered via the computer-assisted web interviewing (CAWI) method. The survey questionnaire was created on the Google platform. The link to the questionnaire was provided via social media to participants of travel groups in the period from 30 November 2020 to 15 February 2021. The sampling was purposive (included only travelers) despite efforts to maintain the gender balance; the proportion of women was higher. Therefore, caution must be applied when interpreting the results which may not be transferable. The survey included questions regarding the respondents’ travel behavior and risk perceptions. 433 correctly completed questionnaires were collected. The dataset was analyzed quantitatively and qualitatively. Descriptive statistics measures and correlation coefficients were used in the analysis of the results. The study shows that some respondents decided against traveling because of the pandemic situation, while those who decided to travel adjusted their behavior by avoiding crowded places and resigning from traveling abroad. Compliance with hygiene standards in the area of tourism services varied, and was the highest in the case of accommodation services. Women rated hygiene standards in chain cafes statistically higher than men and younger people rated hygiene on public transport, trains, air transport and in fast food services higher than older people. The higher the tourism expenditure, the lower the assessment of sanitary standards in tour guide services, air transport and chain cafes decreased.
Sustainable Development of the Rural Areas from Romania: Development of a Digital Tool to Generate Adapted Solutions at Local Level
Authors: Dumitru Eduard Alexandru , Ursu Ana , Tudor Valentina Constanta , Micu Marius Mihai
Published: October 2021

Rural Romania faces many problems, the main one being depopulation. In general, young adults frequently choose to migrate to urban centers or leave the country entirely to satisfy economic and/or social aspirations. The aim of this study is to identify intractable issues that inhibit rural development and to identify actionable solutions. In this regard, a questionnaire was developed and administered at the local level. The results obtained were analyzed with the SPSS Statistical Program, with the Pearson Chi-square, and Cramer and Pearson coefficients were determined. The answers obtained from applying the questionnaire made it possible to identify the causes that inhibit the sustainable development of rural areas. It can be considered that a solution that could lead to the sustainable development of the rural areas from Romania would be represented by the development of a digital tool that would create a synergy between local authorities, researchers and the private sector. In order to be able to solve these problems, the Government of Romania should provide the necessary funds to local authorities, depending on the needs identified through the digital instrument, acting directly on the aspects that restrain the development of those areas.
Cultural Heritage as a Pathway to Sustainable Development in Cyprus: The Case of the Technical Committee on Cultural Heritage
Authors: Goryunova Olga , Wei Qiaowei
Published: October 2021

This work studied the efforts of the Technical Committee on Cultural Heritage in Cyprus to explore how effectively the TCCH applies diplomatic relation-building efforts towards cultural heritage management and how this can be used to construct a bridge to a process of sustainable development of social relations and heritage use in Cyprus. The Committee’s efforts demonstrate community heritage diplomacy and civil heritage diplomacy, employed by the two largest communities of the island as they attempt to build relations with each other and other minor communities across the border via various heritage practices, and public heritage diplomacy, which is employed by the authorities of each side via the Committee to influence the public of the other side. The Committee employs these forms of heritage diplomacy via a language of cooperation and by bridging gaps in and crossing borders for collaboration, so as to transfer knowledge, values, and experience, and to build trust with institutions and communities. The significance of the study lies in illustrating that the technical and collaborative successes of the Committee via application of the determined types of diplomacy may be successfully applied for a sustainable approach to build relations and confidence under ideologically and politically strained circumstances in Cyprus.
Renewable Energy Consumption and Carbon Emissions—Testing Nonlinearity for Highly Carbon Emitting Countries
Authors: Salem Sultan , Arshed Noman , Anwar Ahsan , Iqbal Mubasher , Sattar Nyla
Published: October 2021

An increase in energy consumption indicates increased economic activity; whether it leads to prosperity depends on the sustainability and stability of the energy source. This study has selected the top ten highly carbon emitting countries to assess renewable energy consumption dynamics for 1991 to 2018. The development of renewable energy ventures is not an overnight transformation. Further, it also entails an infrastructure development gestation which may increase CO2 emissions for the short term. To assess this non-linear pattern with CO2 and its heterogeneities, renewable energy consumption and its three types (Wind, Solar and Hydropower) are used. The empirical results estimated with a pooled mean group (PMG) method indicate that renewable energy consumption and hydropower follows inverted U-shaped behavior, with wind and solar energy consumption behavior also U-shaped. Forest area and patents are responsible for carbon remissions, while economic growth is responsible for increasing carbon emissions in sampled countries.
An Integrated Model of Train Re-Scheduling and Control for High-Speed Railway
Authors: Meng Xuelei , Wang Yahui , Lin Li , Li Lei , Jia Limin
Published: October 2021

The goal of train re-scheduling is redesigning the time when trains arrive at and depart from stations of a railway section, and train control problem refers to determining the operating mode for a train in a railway section. It is quite necessary to study the two problems together, and they can be viewed as a theory base for self-driving study. We build a novel model to deal with train re-scheduling and train control problem synthetically. The approach is divided into two stages. The first stage is train re-scheduling, determining the arrival and departure time for trains. Depending on the arrival and departure time, the train running time can be calculated and it is set to be the constraint of the train control model. The destination of the second stage model is to save tracking energy in train operation process, determining the traction plan in each segment of a section between two stations. We also design a quantum-inspired particle swarm optimization algorithm to solve the integrated model. A computation case is presented to prove the availability of the approach. It can generate the re-scheduled timetable and train control plan synthetically with the approach presented in this paper. The main contribution of this paper is to propose a novel approach to solve train re-scheduling problem and train control problem synthetically. It can also provide supporting information for both the dispatchers and the train drivers to improve the on schedule rate and reduce the energy consumption. Furthermore, it may provide some valuable reference for the realization of automatic train driving.
Efficiency Assessment of Operations Strategy Matrix in Healthcare Systems of US States Amid COVID-19: Implications for Sustainable Development Goals
Authors: Özdemir Aydın , Kitapçı Hakan , Gök Mehmet Şahin , Ciğerim Erşan
Published: October 2021

The objective of this study is to assess the efficiency of the operations strategy matrix in the healthcare system of U.S. states amid COVID-19. Output-Oriented Data Envelopment Analysis was used to assess the efficiency of the operations strategy matrix. Strategic Decision Areas (Capacity, Supply Network, Process Technology, and Development and Organization) were considered inputs while competitive priorities (Quality, Cost, Delivery, and Flexibility) were considered outputs. According to results; Alaska, Alabama, Arkansans, Florida, Hawaii, Iowa, Idaho, Louisiana, Minnesota, Missouri, Mississippi, Montana, North Carolina, New Jersey, New York, Oklahoma, South Carolina, South Dakota, Texas, Vermont, Wisconsin, and Wyoming are relatively efficient. Additionally, Connecticut, Louisiana, Minnesota, New Jersey, Rhode Island, Tennessee, Utah, Vermont, Washington, and Wyoming are fully efficient while South Dakota is the state that needs the most improvement in terms of strategic decision areas and competing priorities. On the other hand, inefficient states have larger population and GDP than efficient states. Based on these results, implications for sustainable development goals (SDGs) are drawn.