| 1. |
- Alam, Sultan, et al.
(författare)
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Adsorption Kinetics and Isotherm Study of Basic Red 5 on Synthesized Silica Monolith Particles
- 2021
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Ingår i: Water. - : MDPI. - 2073-4441. ; 13:20
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Tidskriftsartikel (refereegranskat)abstract
- The Silica monolith particles (SMP) were prepared from Tetra-Methyl-Ortho-Silicate (TMOS) and characterized by Fourier transforms infrared (FTIR), Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and surface area analyzer. FTIR analysis showed the Si-O stretching confirming SMP formation. SEM analysis provided information about the mean diameter of SMP (1-5 mu m). EDX confirmed the presence of silicon and oxygen in the SMP. Moreover, the calculated surface area for SMP was found to be around 367 m(2)/g, whereas BJH pore size distributed particles were 87.15 along with the total pore volume and pore radius of 0.073 cm(3)/g and 16.627 & ANGS;, respectively. Besides, the removal efficiency was found to be about 96%. Various kinetic equations were used to calculate the adsorption parameters. Overall, the results show that the most appropriate model for the kinetics data was the pseudo-second order kinetics model while the mechanism of adsorption was best explained by the Langmuir isotherm. The highest removal of Basic Red 5 dye after 120 min at 298 K was 576 mg/g. Moreover, the thermodynamics parameters (Enthalpy, Gibb's energy, and Entropy) were also estimated. The & UDelta;H & DEG; (0.995 kJ/mol) value depicted the endothermic nature of the process. The non-spontaneous aspect of the process was evident from the & UDelta;G & DEG; values which were 60.431, 328.93, and 339.5 kJ/mol at 293, 303, and 313 K, respectively. From the high removal efficiency value, it can be concluded that the prepared adsorbent can be a potential adsorbent in the reclamation of dyes from wastewater.
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| 2. |
- Alkhabbas, Fahed, et al.
(författare)
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ROUTE : A Framework for Customizable Smart Mobility Planners
- 2022
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Ingår i: Proc. - IEEE Int. Conf. Softw. Archit., ICSA. - : Institute of Electrical and Electronics Engineers Inc.. - 9781665417280 - 9781665417297 ; , s. 169-180
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Konferensbidrag (refereegranskat)abstract
- Multimodal journey planners are used worldwide to support travelers in planning and executing their journeys. Generated travel plans usually involve local mobility service providers, consider some travelers' preferences, and provide travelers information about the routes' current status and expected delays. However, those planners cannot fully consider the special situations of individual cities when providing travel planning services. Specifically, authorities of different cities might define customizable regulations or constraints of movements in the cities (e.g., due to construction works or pandemics). Moreover, with the transformation of traditional cities into smart cities, travel planners could leverage advanced monitoring features. Finally, most planners do not consider relevant information impacting travel plans, for instance, information that might be provided by travelers (e.g., a crowded square) or by mobility service providers (e.g., changing the timetable of a bus). To address the aforementioned shortcomings, in this paper, we propose ROUTE, a framework for customizable smart mobility planners that better serve the needs of travelers, local authorities, and mobility service providers in the dynamic ecosystem of smart cities. ROUTE is composed of an architecture, a process, and a prototype developed to validate the feasibility of the framework. Experiments' results show that the framework scales well in both centralized and distributed deployment settings.
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| 3. |
- Almqvist, Lena, 1963-, et al.
(författare)
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Special support for behavior difficulties and engagement in Swedish preschools
- 2018
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Ingår i: Frontiers in Education. - : Frontiers Media S.A.. - 2504-284X. ; 3
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Tidskriftsartikel (refereegranskat)abstract
- The Swedish preschool curriculum stipulates that all children independent of support needs should attend mainstream preschool groups, with equal opportunities for learning and engagement. Preschool teachers are responsible for paying attention to children in need of special support to achieve this. How support is provided for children in need of special support due to behavior difficulties in Swedish preschools varies, however. Some children, often formally identified as in need of special support, are supported by preschool staff supervised by external services. Other children receive support initiated and implemented by preschool staff, without supervision from external services. A further number of children receive no support for behavior difficulties, on top of what is provided to all children. This study investigated associations between support format (i.e. supervised support, staff-initiated support or no additional support), support content (i.e. implementation of support), behavior difficulties, socio-demographics and engagement. A mixed methods approach was used with a sample of 232 preschool children 15 to 71 months with assessed behavior difficulties. Preschool staff reported on the children's engagement, behavior difficulties, socio-demographics and support provision. Logistic regression models were used to analyze the probability of children receiving either support format. Content analysis was used to categorize the support content, reported by preschool staff through open-ended questions. Point-biserial correlations were used to test associations between support content, behavior, socio-demographics and engagement. All children receiving supervised support for behavior difficulties were formally identified by external services as in need of special support. Supervised support was also more common if children disturbed the free play in the preschool group, with the most frequent support being collaboration with external teams. Staff-initiated support was most commonly given to children with high engagement, and for children who are not early second language learners. These children were most frequently supported by staff paying attention to negative behavior. Children who were not perceived as a burden to the group were less likely to receive any form of additional support. Ways of managing the preschool group seem to guide support strategies for children with behavior difficulties, rather than child-focused strategies emphasizing engagement in everyday activities.
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| 4. |
- Baudin, Katarina, et al.
(författare)
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Views of Swedish Elder Care Personnel on Ongoing Digital Transformation : Cross-Sectional Study
- 2020
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Ingår i: Journal of Medical Internet Research. - Toronto : JMIR Publications. - 1438-8871. ; 22:6
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Tidskriftsartikel (refereegranskat)abstract
- Background: Swedish municipalities are facing demographic challenges due to the growing number of older people and the resulting increased need for health care services. Welfare technologies are being launched as possible solutions for meeting some of these challenges.Objective: The aim of this study was to explore the perception, experimentation, evaluation, and procurement of welfare technology practices among professionals working in municipal elder care in relation to their gender, age, and profession.Methods: Data for this explorative cross-sectional study were collected from 393 responses to a web-based survey on municipal elder care in Sweden. Chi square tests were performed to determine the associations.Results: The results revealed gender, age, and professional differences in perspectives of municipal elder care workers. Differences were particularly evident in attitudes toward technology, both the use of technology in general and in the workplace, and involvement and participation in decision making regarding the procurement of new welfare technologies. Men (37/53, 70%) expressed a more positive attitude toward and curiosity regarding new technologies than women (157/336, 46.7%) (P=.03). Regarding age, the younger respondents (18-24 years old) perceived the digital transformation in the workplace as "too slow" (4/4, 100%), whereas the majority of older respondents (65-74 years old) perceived it as happening at the "right pace" (4/7, 57%). The elder care personnel felt encouraged by management to explore and experiment with new welfare technologies, but never did so either for management or with patients. Even though the majority of the respondents were women, more men (4/7, 57%) were involved in the procurement process for welfare technology devices and solutions than women (98/336, 29.2%) (P<.001).Conclusions: Personnel working within municipal elder care were generally very positive toward new technologies. However, both gender and age differences may influence these perspectives such as the personnel's resistance to welfare technology and patients' participation in welfare technology usage and deployment. Different levels of participation in the decision-making process regarding new technology deployment may negatively affect the overall digital transformation within municipal elder care.
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| 5. |
- Berthelsen, Hanne, et al.
(författare)
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What happens to the physical and psychosocial work environment when activity-based offices are introduced into academia?
- 2018
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Ingår i: Journal of Corporate Real Estate. - : Emerald Group Publishing Limited. - 1463-001X .- 1479-1048. ; 20:4, s. 230-243
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Tidskriftsartikel (refereegranskat)abstract
- There is an increased interest for introducing activity-based offices at universities. The purpose of this study is to contribute to the knowledge about the importance of the built environment for the psychosocial work environment within academia by analyzing how staff at a large Swedish university experienced the physical and psychosocial work environment before and after moving to activity-based offices. Design/methodology/approach A Web-based survey was distributed to all employees at two faculties at a university three months before (2015, n = 217, response rate 51 per cent) and nine months after (2016, n = 200, response rate 47 per cent) relocation to a new activity-based university building. Findings In the new premises, a vast majority (86 per cent) always occupied the same place when possible, and worked also more often from home. The social community at work had declined and social support from colleagues and supervisors was perceived to have decreased. The participants reported a lower job satisfaction after the relocation and were more likely to seek new jobs. No aspects in the physical or psychosocial work environment were found to have improved after the relocation. Research/limitations implications The study had a two-wave cross-sectional design, which does not allow establishing causal relations. Practical implications There is reason to be cautious about relocation to activity-based offices at universities. The potential savings in costs for premises may lead to may be followed by an increase in other costs. The risk that staff cannot concentrate on their work in activity-based university workplaces and lose their sense of community with colleagues are factors, which in the long run may lead to decreased efficiency, more conflicts and poorer well-being. Originality/value This paper contributes with new knowledge concerning changes in the physical and psychosocial work environment when relocating from cell offices to activity-based offices in a university setting.
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| 6. |
- Burlakovs, J., et al.
(författare)
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Application of anaerobic digestion for biogas and methane production from fresh beach-cast biomass
- 2022
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Ingår i: 3rd EAGE Global Energy Transition, GET 2022. - : European Association of Geoscientists and Engineers, EAGE. - 9781713863618 ; , s. 61-65, s. 1-5
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Konferensbidrag (refereegranskat)abstract
- In this research, biogas production potential from beach wrack collected in Riga Gulf (Ragaciems, Jaunķemeri, Bigauņciems) and in coastline of Sweden (Kalmar) was studied using an anaerobic digestion method. Selected beach wrack masses laying ashore and containing macroalgal biomass of common macroalgae types specific to the Baltic Sea were mixed for consolidated samples. Anoxic fermentation of untreated beach wrack was carried out in 16 bioreactors applying a single filling mode at 38 °C. The study revealed that by utilizing beach wrack accumulated ashore as a feedstock for anaerobic digestion methane can be utilized if pretreatment and conditioning of the samples are performed. The study was continued for selected brown algae containing biomass tested with three dewatering pretreatment methods: a) keeping in tap water for 24 hours; b) washing with running fresh water for one hour, and c) drying to relatively constant weight. The resulting methane outcome was compared with the data corresponding to raw brown algae. The study confirmed that washing of macroalgal biomass applied as pretreatment prior to anaerobic fermentation avoids inhibition of salts and promotes biomethane production.
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| 7. |
- Burlakovs, Juris, 1977-, et al.
(författare)
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Geophysical aspects of abandoned landfill geomorphological and material properties macro-characterization
- 2020
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Ingår i: International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM. - : International Multidisciplinary Scientific Geoconference. - 9786197603057 ; , s. 551-558
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Konferensbidrag (refereegranskat)abstract
- Landfills (dumps) are places where the end of the life cycle of products can be found - useful material is dumped away from the sight creating contaminant flows around. Another problem is huge unexplored potential of resources recycling - we have limited knowledge also on useful elements and materials that are buried. The solution to overcome the limitations that provide remote sensing and traditional geodesy, proximal sensing techniques could be used. “Near surface geophysics” with operation at or just below the soil surface, significantly may contribute to give answers that traditionally are solved only after excavation. Geophysical methods are various, those can be active (i.e. create its own signal) or passive (i.e. register an existing signal); invasive (by inserting devices into the soil) or non-destructive. Some of these methods are static (e.g. a sequence of inserted electrodes), others can be used in a mobile way (e.g. pulled by a quad-bike). In general, their depth of exploration can vary from a few decimetres to some tens of metres. Thus in range of wide geophysical methodology spectrum almost all methods might be of use for unknown dump exploration depending on circumstances. In this paper, the aim is to macro-characterize anthropogenic geomorphological forms for contouring of old buried dumps by use of magnetometry, and geoelectric research methods to provide knowledge on approximate content of the dump. Protonmagnetometer was used in Eastern Latvia to determine unseen on surface dumpsite, buried in forest; induced polarisation and electric resistivity research was done in Southern Sweden for the macro-content analysis of dump hills composed of glass industry residuals and construction waste mixture. Geophysical surveying was performed to support site investigation with respect to landfill-related environmental problems, to enhance the opportunity for contouring of location of material mass and initially evaluate its physical properties. Results have shown good potential of geophysical surveying to spatially characterize landfill masses (location and dimensions) and to identify the internal structure of a landfill site, which already provides valuable information to estimate the landfill mining (material recovery) potential of landfills.
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| 8. |
- Ciccozzi, Federico, et al.
(författare)
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MDE4IoT : Supporting the Internet of Things with Model-Driven Engineering
- 2017
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Ingår i: Proceedings of the 10th International Symposium on Intelligent Distributed Computing – IDC 2016, Paris, France, October 10-12 2016. - Cham : Springer International Publishing. - 9783319488288 - 9783319488295 ; , s. 67-76
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Konferensbidrag (refereegranskat)abstract
- The Internet of Things (IoT) unleashes great opportunities to improve our way of living and working through a seamless and highly dynamic cooperation among heterogeneous Things including both computer-based systems and physical objects. However, properly dealing with the design, development, deployment and runtime management of this breathing network of Things means to provide solutions for a multitude of challenges. Among them, we focus on: supporting complexity and heterogeneity management, supporting collaborative development, maximising reusability of design artefacts, and providing self-adaptation of IoT systems. In this paper we propose Model-Driven Engineering (MDE) as a key-enabler for solving these challenges and supporting the lifecycle of IoT systems, from their design to runtime management. More specifically, we: (i) introduce MDE4IoT, a Model-Driven Engineering Framework supporting the modelling of Things and self-adaptation of Emergent Configurations of connected systems in the IoT; and (ii) show how MDE in general, and MDE4IoT in particular, can help in tackling the above mentioned challenges by providing the Smart Street Lights case that we use throughout the paper as concrete case.
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| 9. |
- Ciccozzi, Federico, et al.
(författare)
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Model-Driven Engineering for Mission-Critical IoT Systems
- 2017
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Ingår i: IEEE Software. - : IEEE. - 0740-7459 .- 1937-4194. ; 34:1, s. 46-53
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Tidskriftsartikel (refereegranskat)abstract
- Mission-critical Internet of Things (MC-IoT) systems involve heterogeneous things from both the digital and physical worlds. They run applications whose failure might cause significant and possibly dramatic consequences, such as interruption of public services, significant business losses, and deterioration of enterprise operations. These applications require not only high availability, reliability, safety, and security but also regulatory compliance, scalability, and serviceability. At the same time, they're exposed to various facets of uncertainty, spanning from software and hardware variability to mission planning and execution in possibly unforeseeable environments. Model-driven engineering can potentially meet these challenges and better enable the adoption of MC-IoT systems.
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| 10. |
- Coelho, Vera, et al.
(författare)
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Preschool practices in Sweden, Portugal, and the United States
- 2021
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Ingår i: Early Childhood Research Quarterly. - : Elsevier BV. - 0885-2006 .- 1873-7706. ; 55, s. 79-96
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Tidskriftsartikel (refereegranskat)abstract
- Across countries, there are important differences related to the goals, organization, and educational philosophies of care provided to young children prior to formal schooling. Those differences are likely reflected in the classroom practices and teacher-child interactions within a country's early childhood education and care (ECEC) classrooms. This study aims to evaluate the within-country relevance of two classroom observation measures primarily based on a behavioral count approach focused on teacher and child behaviors; and to examine preschool practices in Sweden, Portugal, and the U.S., as they reflect each country's ECEC goals, organization, and educational philosophies. Participants are 78 preschool settings in Sweden, 42 in Portugal, and 168 in the U.S. Results show that the measures targeted culturally-relevant behaviors and provided inter-rater reliability for the behavior count variables in the three countries. Future collaborations may address additional culturally-specific variables. The behavioral descriptions yielded by combining behavioral counts of the measures are analyzed by researchers from the relevant country for insights to the country's values related to early childhood as well as current debates regarding care for children. Measures that provide comprehensive descriptions of classroom settings and apply minimal external or comparative value judgments on the behaviors observed are of practical utility for collaborative international work.
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