bluuebunny/crossref_metadata_2025 huggingface dataset:
Factors Influencing the Acceptance of Mobile Collaborative Learning for the Continuous Professional Development of Teachers
Authors: Dahri Nisar Ahmed , Vighio Muhammad Saleem , Bather Jairam Das , Arain Aijaz Ahmed
Published: December 2021

The COVID-19 epidemic has not only triggered a worldwide health catastrophe, it has also affected learning processes all over the world. While COVID-19 was in its initial wave of transmission, educational systems around the world witnessed bitter experiences in the form of the closure of institutes or a shift to distance (or online) learning techniques. The delivery of quality education was affected the most where the educational system was already weak due to the unavailability of effective teachers’ professional development programs and the lack of the integration of technology. This study extends the conventional continuous professional development (CPD) model of in-service teachers adopted in the province of Sindh, Pakistan. The extensions are based on the integration of mobile technology and support for collaborative learning and ongoing assistance, which are missed in the current traditional model. To assess the acceptance and use of the app, an Mobile collaborative learning (MCL) based CPD acceptance framework is designed by combining chosen components from a generally recognized Unified theory of acceptance and use of technology (UTAUT2) and other well-recognized acceptance models for the acceptance and use of the technology. In the context of CPD, a total of 14 constructs have been selected which include performance expectancy; effort expectancy; facilitating conditions; hedonic motivation; mobility; knowledge acquisition; content and information quality; on-the-job support; reward; behavioral intention; engagement; interactivity with peer & experts; self-management and collaborative learning. Based on these constructs; a total of 13 hypotheses were developed with 55 measurement items. A total of 494 teachers participated in a two-week training session using the designed app. Based on the activity, a questionnaire was designed and distributed among the participants using WhatsApp groups during the academic year of 2021–2022. Out of 494 participants; 472 participants correctly filled in the questionnaires, which were selected for analysis. The data was analyzed using IBM SPSS version 21; and, for Structural Equation Modeling (SEM) analysis, IBM AMOS version 21 was used. According to the results, all thirteen hypotheses were found statistically significant showing the positive impact on the acceptance and use of the CPD app. The results of this study promote teachers’ and experts’ engagement and participation in CPD activities which not only improve the knowledge and skills of the learners but also impact their long-term professional development and success. This research may help the teachers’ training and related institutions to make better choices and develop a mobile collaborative learning system for school-based teacher support and training programs. As a basis, this study may also be used in other provinces of Pakistan and beyond to make it a CPD standard.
The Effects of Leisure Life Satisfaction on Subjective Wellbeing under the COVID-19 Pandemic: The Mediating Role of Stress Relief
Authors: Yu Grace B. , Kim Najung
Published: December 2021

Under the continuous spread of COVID-19 infection, individuals are finding their own ways to manage their stress and subjective wellbeing. The main objective of this research is to test the role of leisure life satisfaction on one’s subjective wellbeing in the era of COVID-19 as mediated by stress relief. Individuals’ satisfaction with leisure life is hypothesized to both directly and indirectly affect their subjective wellbeing as mediated by relieved stress. The positive impact of stress relief on one’s subjective wellbeing is hypothesized to be moderated by the perceived seriousness of the COVID-19 pandemic. Data from a large-scale social survey in South Korea (N = 40,085) were used to test the hypotheses and the results confirmed them. Theoretical and managerial implications that stress the importance of the strategic management of one’s leisure life are discussed.
The Determination of Priority Areas for the Construction of Green Roofs with Use of the Urban Area Valorisation Method
Authors: Pawłowska Kamila , Jawecki Bartosz
Published: December 2021

The aim of the research was to valorise the analysed urbanized area in the direction of determining the hierarchy in the order of interventions aimed at increasing the share of biologically active area and natural field retention, the potential impact of green roofs on the valorisation of the studied urbanized areas. The research covered the Gajowice estate in Wrocław. The scope of the research included the division of the area into working cells, for which valorisation was carried out using the point method based on the criterion of the degree of covering the land with vegetation and the degree of covering the area with various types of buildings. The valorisation result was determined on the basis of a comparative matrix taking into account the results of the partial assessment of vegetation and building cover. The impact of green infrastructure (green roofs) on valorisation was simulated by proposing their location on buildings with the so-called big plate. The introduction of green roofs on selected buildings improved the valorisation result in some research cells, reducing the number of cells requiring intervention. This raised the valorisation assessment by even two classes, which resulted in a significant reduction in the number of critical areas, with too much hardened surface, and increased the number of areas with a satisfactory level of biologically active surfaces.
Pathogens Removal in a Sustainable and Economic High-Rate Algal Pond Wastewater Treatment System
Authors: Abd-Elmaksoud Sherif , Abdo Sayeda M. , Gad Mahmoud , Hu Anyi , El-Liethy Mohamed Azab , Rizk Neveen , Marouf Mohamed A. , Hamza Ibrahim A. , Doma Hala S.
Published: December 2021

This study evaluates the efficiency of a sustainable technology represented in an integrated pilot-scale system, which includes a facultative pond (FP), a high-rate algal pond (HRAP), and a rock filter (RF) for wastewater treatment to produce water that complies with the Egyptian standards for treated wastewater reuse. Still, limited data are available on pathogen removal through HRAP systems. Thus, in this study, the performance of the integrated system was investigated for the removal of Escherichia coli (E. coli), coliform bacteria, eukaryotic pathogens (Cryptosporidium spp., Giardia intestinalis, and helminth ova), somatic coliphages (SOMCPH), and human adenovirus (HAdV). Furthermore, physicochemical parameters were determined in order to evaluate the performance of the integrated system. The principal component analysis and non-metric multidimensional scaling analysis showed a strong significant effect of the integrated system on changing the physicochemical and microbial parameters from inlet to outlet. The mean log10 removal values for total coliform, fecal coliform, and E. coli were 5.67, 5.62, and 5.69, respectively, while 0.88 log10 and 1.65 log10 reductions were observed for HAdV and SOMCPH, respectively. The mean removal of Cryptosporidium spp. and Giardia intestinalis was 0.52 and 2.42 log10, respectively. The integrated system achieved 100% removal of helminth ova. The results demonstrated that the system was able to improve the chemical and microbial characteristics of the outlet to acceptable levels for non-food crops irrigation. Such findings together with low operation and construction costs of HRAPs should facilitate wider implementation of these nature-based systems in remote and rural communities. Overall, this study provides a novel insight into the performance of such systems to eliminate multiple microbial pathogens from wastewater.
Targeting Smartphone Use While Driving: Drivers’ Reactions to Different Types of Safety Messages
Authors: Šeibokaitė Laura , Markšaitytė Rasa , Endriulaitienė Auksė , Slavinskienė Justina , Šakinytė Dainora , Tamajevaitė Gerda
Published: December 2021

Only a few previous studies analyzed the effectiveness of road safety messages targeting smartphone use while driving and only several of them used messages from an ongoing road safety campaign. Thus, contributing to the field, this study aimed at testing the effectiveness of two types of social messages (threat appeal and threat appeal together with safe behavior role modelling) targeting smartphone use while driving. Ninety-three drivers were randomly assigned to two experimental (n1 = 26; n2 = 37) and one control (n = 29) groups. Each experimental group was presented with one 30 s length video message to reduce or stop smartphone use while driving. Messages differed in terms of threat appeal and modelling of safe behavior. The control group was presented with a 30 s length video clip showing neutral driving related content. The results revealed that threat appeals (alone or together with a safe role model) resulted in less positive emotions when compared to the control group’s reported emotional reactions. The message with threat appeal only also resulted in more negative emotions compared to the control group. With regards to behavioral intentions, road safety messages used in this study had minor effectiveness: the threat appeal message reduced the intentions to use smartphones while driving, only when previous behavior has been controlled. In sum, messages targeting smartphone use while driving were effective at least to some extent in changing drivers’ emotions and intentions not to be involved in targeted behavior, but the effect was minor and threat appeal only showed higher effectiveness.
Can Financial Constraints and Regulatory Distance Reduce Corporate Environmental Irresponsibility?
Authors: Wu Haiquan , Liao Wenli , Zhou Zhifang , Li Yi
Published: December 2021

As global environmental problems become increasingly severe, corporate social (environmental) responsibility has become a hot topic in research, but there is still a lack of clear understanding of corporate environmental irresponsibility behavior and the driving factors behind this behavior. Our research aims to reveal the factors affecting corporate environmental irresponsibility from both internal and external perspectives. Inside enterprises, financial constraints will affect the degree of capital adequacy and thus affect the environmental behavior of enterprises. Externally, the fulfillment of corporate environmental responsibility will be affected by external regulatory pressure. Taking 399 A-share listed companies in China’s heavily polluting industries as the research objects, this paper empirically analyzes the influence paths and internal mechanisms of financial constraints and regulatory distance on corporate environmental irresponsibility, and it further divides regulatory distance into physical regulatory distance and power regulatory distance. This paper’s findings show that both financial constraints and physical regulatory distance were positively correlated with corporate environmental irresponsibility in China, and that the positive correlation between physical regulatory distance and corporate environmental irresponsibility was more significant in non-state-owned enterprises. In addition, financial constraints and regulatory distance have a complementary effect on corporate environmental irresponsibility. These findings can reduce the environmental risks posed by enterprises and help them to avoid environmental irresponsibility.
Sustainable Finance and COVID-19: The Reaction of ESG Funds to the 2020 Crisis
Authors: Pisani Fabio , Russo Giorgia
Published: December 2021

We investigated the financial performance of a sample of sustainable investment funds in terms of returns, volatility, and contagion risk during the financial crisis caused by the COVID-19 pandemic. In order to conduct a more reliable analysis, we considered a homogenous sample composed of 30 funds declaring the same benchmark (the MSCI Europe index). The Morningstar Sustainability ESG rating was used to determine the level of sustainability of each fund. Both the GARCH models and the event study suggest that funds with a higher ESG rating were able to outperform other funds during the COVID-19 period. These funds had a greater level of resilience and exhibited a lower level of risk contagion during the pandemic. These instruments appear to assume the role of risk protection and should be considered a means of both promoting sustainable growth and minimizing portfolio risk.
Can We Build Walkable Environments to Support Social Capital? Towards a Spatial Understanding of Social Capital; a Scoping Review
Authors: Morales-Flores Paloma , Marmolejo-Duarte Carlos
Published: December 2021

Empirical evidence suggests that it is possible to socially renew neighbourhoods through the formation of social capital (SC) as an effect of walking. The characteristics of the built environment that influence walkability and SC have been relatively well established by previous research, but contrasts remain. Therefore, this document seeks to investigate the relationship between SC and walkability, through a Scoping Review of empirical studies published in indexed journals in the Web of Science and Scopus. The findings indicate that the formation of SC as an effect of walking is associated with land use and the design of neighbourhood facilities; the provision of urban furniture (benches) and green spaces; and that the design and configuration of the neighbourhoods affects SC even more than the excess density. In addition, the methodological strategies used to arrive at these results were reviewed. The conclusions suggest the need to study this issue from an updated perspective, where new neighbourhood interaction systems can be tracked (that provide new indicators), using advanced tools and technologies that help streamline and make measurements more objective.
Determinants of Tourism Product Development in Southeast Ethiopia: Marketing Perspectives
Authors: Melese Kassegn Berhanu , Belda Temesgen Heiyo
Published: December 2021

Tourism has been given much attention in developing countries like Ethiopia. In this regard, tourism product development played a great role in achieving sustainable developmental goals. The study aims to examine the determinants of tourism product development in southeast Ethiopia. The research employed a mixed research approach, and descriptive and explanatory research design was used. Both secondary and primary data sources were in place to obtain the relevant data. A total of 398 samples were employed to collect the data. A convenience sampling technique was employed to select domestic tourists and walk-in guests and purposive sampling was applied to select marketing managers of hotels, lodges, boat associations, park administration, resorts, restaurants, nightclubs, and guest houses. The qualitative data was analyzed through thematic analysis and the quantitative data was analyzed using descriptive and inferential statistics by computing SPSS. The study revealed that tourism product development is affected by marketing mixes of which promotion was the major factor of tourism product development and price was the only tool inversely related to tourism product development. The brand image also positively determined tourism product development. The results showed that the exercise of tourism product development strategies among tourism businesses was low. The main implication drawn from the study is that the tourism businesses have to develop new customer profiles or segmenting in customers in their specified characteristics like gender, level of income, and age. Furthermore, the need to invest in research and development of the current market to develop new tourism products is of great importance.
Towards Higher Quality of Recycled Plastics: Limitations from the Material’s Perspective
Authors: Alassali Ayah , Picuno Caterina , Chong Zhi Kai , Guo Jinyang , Maletz Roman , Kuchta Kerstin
Published: December 2021

The increasing consumption of plastics and plastic products results in correspondingly substantial volumes of waste, which poses considerable environmental burdens. With the ongoing environmental actions, the application of circular economy on this waste stream is becoming inevitable. In this paper, the topics of plastics recycling, circular economy on plastics, and challenges to plastic waste recycling are critically reviewed. In the first part of this paper, the development of research on plastic recycling was viewed from 1950 until 2020 using the scientific database Web of Science, and 682 related studies were found and used to assess the changing research priorities along that timeline. The following sections discuss the potentials and requirements to enhance the quality of the produced recycled plastic, in connection with the factors that currently limit it. In conclusion, the quality of recycled plastic is generally determined by the homogeneity of the recovered plastic feed. There are various strategies which could be implemented to overcome the hindrances identified in the paper and to improve the quality of the recycled plastic, such as working on enhanced product designs for minimised waste heterogeneity and controlling the materials’ degree of contamination by applying advanced sorting.
Evaluating Attitudes towards Large Carnivores within the Great Bear Rainforest
Authors: Leveridge Max C. , Davis Amélie Y. , Dumyahn Sarah L.
Published: December 2021

Cohabitation between humans and carnivores is vital to the continued existence and integrity of ecosystems, often playing a large role in the success of large carnivore conservation. We focus on interactions between humans and carnivores in the world’s largest, relatively intact temperate rainforest—The Great Bear Rainforest (GBR), British Columbia, Canada. Specifically, we focus on residents of Prince Rupert, a city within the GBR, and examine its residents’ ecological and relational attitudes towards the surrounding area of protected rainforest and the large carnivores present in the area. We aim to determine the strength of public attitudes and values of the environment and carnivores in the GBR, and to examine whether they differ between First Nations and non-First Nations residents of Prince Rupert, British Columbia. We conducted 28 semi-structured interviews of Prince Rupert residents. At the start of the interview, respondents self-administered a survey consisting of statements from the Social Ecological Relational Value and the New Ecological Paradigm scales. We find no significant difference between First Nations and non-First Nations respondent attitudes. This is possibly due to three factors: (1) cultural influence from the local First Nations, (2) the fact that these carnivores are important for the local economy through tourism, and (3) a strong sense of place associated with the area and the carnivores that inhabit it regardless of positive or negative encounters with these animals. While we find positive attitudes towards carnivores and little evidence of human–wildlife conflict, feelings towards carnivores encountered in town or while hiking tend to be negative, especially when they involve wolves. In order to mitigate these effects in a way that protects these valuable creatures, respondents overwhelmingly clamored for a conservation officer to be assigned to Prince Rupert. We conclude that policy and management might alleviate human–carnivore conflicts in the area should our results be corroborated by studies with larger sample sizes.
Learning through Play: A Serious Game as a Tool to Support Circular Economy Education and Business Model Innovation
Authors: Manshoven Saskia , Gillabel Jeroen
Published: December 2021

Despite the increasing attention on circular economy at the policy level, the implementation of circular business models in companies is still limited. Many companies are put off by the apparent complexity to translate the general concepts of a circular economy into their business practice. This paper presents the development and testing of a simulation board game that aimed to address this gap between theory and business practice. The board game, Risk&RACE, was developed with the purpose of enabling students and business executives to experiment with circular economy business models. The gameplay was tested with 120 users, and cognitive learning outcomes as well as learning dynamics were assessed using a survey. The results of the game workshops demonstrated that the game advanced the participants’ awareness of the need for a circular economy, their understanding of basic circular economy principles, and their insight in opportunities and challenges of circular business models at the company level. When reflecting on the game as a learning tool, players highlighted its engaging and realistic nature and praised how it stimulated strategic thinking. Complementing the gameplay with a debriefing discussion afterwards encouraged players to reflect upon their newly gained insights, deepening their learning experience.
Effect of Glass Cullet Size and Hydrated Lime—Nanoclay Additives on the Mechanical Properties of Glassphalt Concrete
Authors: İskender Cansu , İskender Erol , Aksoy Atakan , Şengül Celaleddin Ensar
Published: December 2021

In this study, the use of glass waste as aggregate in asphalt mixtures was investigated. Maximum glass aggregate size options of 0.075, 2.00, 4.75 and 9.5 mm. were selected. Conventional bitumen, nanoclay-modified bitumen and hydrated lime-modified bitumen were used. Dense graded asphalt mixtures were designed according to the Marshall method. Mixtures were evaluated for low-temperature cracking, resistance to water damage, fatigue, and permanent deformation behavior with repeated creep, indirect tensile strength, indirect tensile fatigue, modified Lottman and Hamburg wheel tracking tests. Increasing glass aggregate size reduced the water damage resistance of asphalt mixtures because of the smooth surface of the glass particles and nanoclay and hydrated lime modification improved the mechanical properties of the asphalt mixtures. Using 2.00 mm sized maximum glass aggregate showed relatively less water damage and deformation properties due to higher internal friction which is due to the greater angularity of the glass particles. In addition, there was a significant correlation between repeated creep test, modified Lottman methods and Hamburg Wheel tracking test from the viewpoint of deformation and water damage assessments.
Ranking the Performance of Universities: The Role of Sustainability
Authors: Burmann Christoph , García Fernando , Guijarro Francisco , Oliver Javier
Published: December 2021

University rankings assess the performance of universities in various fields and aggregate that performance into a single value. In this way, the aggregate performance of universities can be easily compared. The importance of rankings is evident, as they often guide the policy of Higher Education Institutions. The most prestigious multi-criteria rankings use indicators related to teaching and research. However, many stakeholders are now demanding a greater commitment to sustainable development from universities, and it is therefore necessary to include sustainability criteria in university rankings. The development of multi-criteria rankings is subject to numerous criticisms, including the subjectivity of the decision makers when assigning weights to the criteria. In this paper we propose a methodology based on goal programming that allows objective, transparent and reproducible weighting of the criteria. Moreover, it avoids the problems associated with the existence of correlated criteria. The methodology is applied to a sample of 718 universities, using 11 criteria obtained from two prestigious university rankings covering sustainability, teaching and research. A sensitivity analysis is carried out to assess the robustness of the results obtained. This analysis shows how the weights of the criteria and the universities’ rank change depending on the λ parameter of the goal programming model, which is the only parameter set by the decision maker.
Comprehensive Analysis of Ecological Restoration Technologies in Typical Ecologically Vulnerable Regions around the World
Authors: Wang Shuang , Zhen Lin , Luo Qi , Wei Yun-Jie , Xiao Yu
Published: December 2021

Ecosystem degradation is a key issue facing the world. Rapid economic development has been achieved at the cost of degradation and environmental pollution, which has affected human well-being, particularly in fragile ecosystems. To achieve the United Nations sustainable development goals, it is essential to develop technologies to control degradation and restore ecosystems. However, a comprehensive assessment of the different types of degradation, of the methods used in different regions, and of the differences between regions has not been carried out. In this study, we examined databases of international organizations, interviewed experts to evaluate existing methods based on five dimensions, identified restoration technologies (hereinafter referred to as RTs) suitable for different types of degradation, and summarized the restoration effectiveness in different regions. We found 101 RTs around the world and found that the same technology can be applied in different regions. The RTs were dominated by engineering and biological RTs, accounting for 19.2–26.7% and 33.4–34.7% of the total, respectively. 45, 30, and 26 RTs were suitable for controlling soil erosion, sandy desertification, and degraded ecosystem, respectively. The average evaluation index of RTs for controlling these degradation problems are 0.81, 0.78, and 0.73, respectively meaning RTs used to fight soil erosion are more effective. The potential to transfer a technology to other regions and the readiness of the technologies were low for degraded ecosystems, and the ease of use was high for sandy desertification RTs. Although a given technology could be applied to different regions or degradation types, results varied. Our study will help ecosystem managers to deal with specific degradation issues, phases, and severities, and will support the transfer of RTs among regions.
A Tribute to Professor Gaetano Granozzi and His Contributions to Surface Science on the Occasion of His 70th Birthday
Authors: Kolasinski Kurt W.
Published: December 2021

On the occasion of his 70th birthday, we celebrate the career of our Editor-in-Chief, Professor Gaetano Granozzi [...]
Naringenin Release to Biomembrane Models by Incorporation into Nanoparticles. Experimental Evidence Using Differential Scanning Calorimetry
Authors: Torrisi Cristina , Di Guardia Marco , Castelli Francesco , Sarpietro Maria Grazia
Published: December 2021

Naringenin (4′,5,7-trihydroxyflavanone-7-rhamnoglucosideor naringenin-7-rhamnoglucoside), a flavonoid present in large quantities in citrus, has different beneficial effects on human health as an antioxidant, free radical scavenger, anti-inflammatory, carbohydrate metabolism promoter, and immune system modulator. Different studies have shown that this substance also has a hypoglycemic and antihypertensive effect, reduces cholesterol and triglycerides, and plays an important protective role in the heart tissue; moreover, it provides neuroprotection against various neurological disorders such as Parkinson’s disease and unpredictable chronic stress-induced depression. Despite these advantages, Naringenin is poorly absorbed, and the small percentage absorbed is rapidly degraded by the liver, as a result losing its activity. Several approaches have been attempted to overcome these obstacles, among them, nanotechnology, with the use of Drug Delivery Systems (DDS) as Solid Lipid Nanoparticles (SLN) and Nanostructured Lipid Carriers (NLC). DDS can, in fact, improve the drug bioavailability. The aim of this study was to develop and characterize SLN and NLC containing Naringenin and to evaluate the ability of these nanoparticles to release Naringenin at the cell level using biomembrane models represented by Multilamellar Vesicles (MLV). These studies were performed using Differential Scanning Calorimetry, a powerful technique to detect the interaction of drugs and delivery systems with MLV. It was shown that Naringenin could be better incorporated into NLC with respect to SLN and that Naringenin could be released by NLC into the biomembrane model. Therefore, suggesting the administration of Naringenin loaded into nanoparticles could help avoid the disadvantages associated with the use of the free molecule.
Combined Endoscopic and Intraoral Approach or Intraoral Alone in Surgical Management of Odontogenic Sinusitis
Authors: Boccuto Mariagrazia , Ottaviano Giancarlo , Prosenikliev Vlatko , Cerrato Alessia , Zanette Gastone , Bacci Christian
Published: December 2021

The physiological behavior of paranasal sinuses depends on the potency of the ostiomeatal complex and on normal mucociliary function. The interruption of this delicate equilibrium can lead to pathological conditions such as sinusitis. Anywhere between 10% and over 25% of cases of maxillary sinusitis have an odontogenic origin, such as: dental infection; alveolar dental trauma; or iatrogenic causes, such as extractions, endodontic therapies, maxillary osteotomies or placement of endosseous implants. The resolution of sinus pathology is related to the resolution of odontogenic pathology. Aim: to evaluate the therapeutic efficacy of a combined oral and endoscopic approach in the treatment of chronic odontogenic sinusitis vs. oral dental management through a case control study. Materials and Methods: all patients showing signs and symptoms of odontogenic sinusitis with obliteration (appreciable radiopacity in CT) of unilateral maxillary sinus between January 2018 and September 2019 at Padua University Hospital were enrolled in this retrospective study. The exclusion criteria were: maxillary sinusitis without odontogenic origin, or resolution with a systemic antibiotic therapy; and presence of anatomical abnormalities that promote the onset of rhinosinusitis. The patients were divided into two groups: one group was treated with a combined surgical approach under general anesthesia (Functional Endoscopic Sinus Surgery-FESS and simultaneous closure of oroantral communication with Bichat’s fat pad advancement); while the other group was treated only with an intraoral approach under local anesthesia and conscious sedation (closure of oroantral communication with Bichat’s fat pad advancement). The variable “success of the surgical procedure” in the two groups was compared by a Student test (with p < 0.05). Results: among the patients enrolled, 10 patients (aged between 42 and 70) made up the case group and the other 10 patients (aged between 51 and 74) constituted the control group. There was no statistically significant difference in success between the two groups (p < 0.025). Conclusions: according to this case study, an exclusive annotation invasive intraoral approach seemed to be comparable to the transoral endoscopic combined method. However, during diagnosis it is necessary and fundamental to distinguish between odontogenic and rhinogenic sinusitis in order for the resolution of odontogenic sinusitis to be achieved.
Synthesis of Silica-Based Materials Using Bio-Residues through the Sol-Gel Technique
Authors: Zanotti Karine , Igal Katerine , Colombo Migliorero María Belen , Gomes Zuin Vânia , Vázquez Patricia Graciela
Published: December 2021

This study focused on the use of citrus bio-waste and obtention of silica-based materials through the sol-gel technique for promoting a greener and more sustainable catalysis. The sol-gel method is a versatile synthesis route characterized by the low temperatures the materials are synthesized in, which allows the incorporation of organic components. This method is carried out by acid or alkali hydrolysis combined with bio-waste, such as orange and lemon peels, generated as co-products in the food processing industry. The main objective was to obtain silica-based materials from the precursor TEOS with different catalysts—acetic, citric and hydro-chloric acids and ammonium hydroxide—adding different percentages of lemon and orange peels in order to find the influence of bio-waste on acids/alkali precursor hydrolysis. This was to partially replace these catalysts for orange or lemon peels. The solids obtained were characterized with different techniques, such as SEM, FT₋IR, potentiometric titration and XRD. SEM images were compared with pure silica obtained to contrast the morphology of the acidic and alkali hydrolysis. However, until now, few attempts have been made to highlight the renewability of reagents used in the synthesis or to incorporate bio-based catalytic processes on larger scales.
The North–South Asymmetry of Sunspot Relative Numbers Based on Complex Network Technique
Authors: Xu Hengyu , Fei Yu , Li Chun , Liang Jiajuan , Tian Xinan , Wan Zhongjie
Published: December 2021

Solar magnetic activity exhibits a complex nonlinear behavior, but its dynamic process has not been fully understood. As the complex network technique can better capture the dynamics of nonlinear system, the visibility graphs (VG), the horizontal visibility graphs (HVG), and the limited penetrable visibility graphs (LPVG) are applied to implement the mapping of sunspot relative numbers in the northern and southern hemispheres. The results show that these three methods can capture important information of nonlinear dynamics existing in the long-term hemispheric sunspot activity. In the presentation of the results, the network degree sequence of the HVG method changes preferentially to the original data series as well as the VG and the LPVG, while both the VG and the LPVG slightly lag behind the original time series, which provides some new ideas for the nonlinear dynamics of the hemispheric asymmetry in the two hemispheres. Meanwhile, the use of statistical feature-skewness values and complex network visibility graphs can yield some complementary information for mutual verification.
Periodicity on Neutral-Type Inertial Neural Networks Incorporating Multiple Delays
Authors: Zhang Jian , Chang Ancheng , Yang Gang
Published: December 2021

The classical Hopefield neural networks have obvious symmetry, thus the study related to its dynamic behaviors has been widely concerned. This research article is involved with the neutral-type inertial neural networks incorporating multiple delays. By making an appropriate Lyapunov functional, one novel sufficient stability criterion for the existence and global exponential stability of T-periodic solutions on the proposed system is obtained. In addition, an instructive numerical example is arranged to support the present approach. The obtained results broaden the application range of neutral-types inertial neural networks.
Linear and Nonlinear Electrostatic Excitations and Their Stability in a Nonextensive Anisotropic Magnetoplasma
Authors: Khalid Muhammad , Ata-ur-Rahman  , Althobaiti Ali , Elagan Sayed K. , Alkhateeb Sadah A. , Elghmaz Ebtehal A. , El-Tantawy Samir A.
Published: December 2021

In the present work, the propagation of (non)linear electrostatic waves is reported in a normal (electron–ion) magnetoplasma. The inertialess electrons follow a non-extensive q-distribution, while the positive inertial ions are assumed to be warm mobile. In the linear regime, the dispersion relation for both the fast and slow modes is derived, whose properties are analyzed parametrically, focusing on the effect of nonextensive parameter, component of parallel anisotropic ion pressure, component of perpendicular anisotropic ion pressure, and magnetic field strength. The reductive perturbation technique is employed for reducing the fluid equation of the present plasma model to a Zakharov–Kuznetsov (ZK) equation. The parametric role of physical parameters on the characteristics of the symmetry planar structures such solitary waves is investigated. Furthermore, the stability of the pulse soliton solution of the ZK equation against the oblique perturbations is investigated. Furthermore, the dependence of the instability growth rate on the related physical parameters is examined. The present investigation could be useful in space and astrophysical plasma systems.
Analysis of Sound Absorption Characteristics of Acoustic Ducts with Periodic Additional Multi-Local Resonant Cavities
Authors: Liu Junyi , Wang Ting , Chen Meixia
Published: December 2021

With the aim of applying various Helmholtz resonant cavities to achieve low-frequency sound absorption structures, a pipe structure with periodic, additional, symmetrical, multi-local resonant cavities is proposed. A thin plate with additional mass is placed in the cylindrical Helmholtz resonant cavity structure to form a symmetric resonant cavity structure and achieve multi-local resonance. The simulation results show that the periodic structure proposed in this paper can produce multiple, high acoustic transmission loss peaks and multiple lower broadband sound absorption frequency bands in the low-frequency range. In this paper, this idea is also extended to the Helmholtz resonant cavity embedded with multiple additional mass plates. The results show that the periodic arrangement of the multi-local resonant symmetric cavity inserted into multiple plates with mass can significantly increase its transmission loss and show a better performance on low-frequency sound absorption characteristics.
Fisher and Skew Information Correlations of Two Coupled Trapped Ions: Intrinsic Decoherence and Lamb-Dicke Nonlinearity
Authors: Mohamed Abdel-Baset A. , Farouk Ahmed , Yassen Mansour F. , Eleuch Hichem
Published: December 2021

It is well known that many quantum information processing methods in artificial atoms depend largely on their engineering properties and their ability to generate quantum correlations. In this paper, we investigate the non-classical correlation dynamics of two trapped ions by using local quantum Fisher information, local quantum uncertainty, as well as logarithmic negativity. The system engineering is designed such that the two-trapped-ions work as two diploe-coupled qubits in a Lamb-Dicke regime. The center-of-mass vibrational modes are initially in coherent/even coherent states. It is found that the two-trapped-ions correlations can be controlled by the Lamb-Dicke nonlinearity, the nonclassicality effect of the initial center-of-mass vibrational mode, as well as the trapped-ion coupling and the intrinsic decoherence. The sudden changes in the non-classical correlations and their stability are shown against Lamb-Dicke nonlinearity, the nonclassicality, the trapped-ion coupling, and the intrinsic decoherence.
ROA-CONS: Raccoon Optimization for Job Scheduling
Authors: Koohi Sina Zangbari , Abdul Hamid Nor Asilah Wati , Othman Mohamed , Ibragimov Gafurjan
Published: December 2021

High-performance computing comprises thousands of processing powers in order to deliver higher performance computation than a typical desktop computer or workstation in order to solve large problems in science, engineering, or business. The scheduling of these machines has an important impact on their performance. HPC’s job scheduling is intended to develop an operational strategy which utilises resources efficiently and avoids delays. An optimised schedule results in greater efficiency of the parallel machine. In addition, processes and network heterogeneity is another difficulty for the scheduling algorithm. Another problem for parallel job scheduling is user fairness. One of the issues in this field of study is providing a balanced schedule that enhances efficiency and user fairness. ROA-CONS is a new job scheduling method proposed in this paper. It describes a new scheduling approach, which is a combination of an updated conservative backfilling approach further optimised by the raccoon optimisation algorithm. This algorithm also proposes a technique of selection that combines job waiting and response time optimisation with user fairness. It contributes to the development of a symmetrical schedule that increases user satisfaction and performance. In comparison with other well-known job scheduling algorithms, the simulation assesses the effectiveness of the proposed method. The results demonstrate that the proposed strategy offers improved schedules that reduce the overall system’s job waiting and response times.
On the Semi-Local Convergence of an Ostrowski-Type Method for Solving Equations
Authors: Argyros Christopher I. , Argyros Ioannis K. , Joshi Janak , Regmi Samundra , George Santhosh
Published: December 2021

Symmetries play a crucial role in the dynamics of physical systems. As an example, microworld and quantum physics problems are modeled on principles of symmetry. These problems are then formulated as equations defined on suitable abstract spaces. Then, these equations can be solved using iterative methods. In this article, an Ostrowski-type method for solving equations in Banach space is extended. This is achieved by finding a stricter set than before containing the iterates. The convergence analysis becomes finer. Due to the general nature of our technique, it can be utilized to enlarge the utilization of other methods. Examples finish the paper.
Adaptive Asymptotic Regulation for Uncertain Nonlinear Stochastic Systems with Time-Varying Delays
Authors: Chen Xuemiao , Wu Ziwen , Li Jing , Zhao Qianjin
Published: December 2021

In this paper, for a class of uncertain stochastic nonlinear systems with input time-varying delays, an adaptive neural dynamic surface control (DSC) method is proposed. To approximate the unknown continuous functions online, the neural network approximation technique was applied, and based on the DSC scheme, the desired controller was constructed. A compensation system is presented to compensate for the effect of the input delay. The Lyapunov–Krasovskii functionals (LKFs) were employed to compensate for the effect of the state delay. Compared with the existing works, based on using the DSC scheme with the nonlinear filter and stochastic Barbalat’s lemma, the asymptotic regulation performance of this closed-loop system can be guaranteed under the developed controller. To certify the availability for the designed control method, some simulation results are presented.
Oxidative Stress and Cocaine Intoxication as Start Points in the Pathology of Cocaine-Induced Cardiotoxicity
Authors: Georgieva Ekaterina , Karamalakova Yanka , Miteva Radostina , Abrashev Hristo , Nikolova Galina
Published: December 2021

Psychomotor stimulants are the most commonly used prohibited substances after cannabis. Globally, their use reaches epidemiological proportions and is one of the most common causes of death in many countries. The use of illicit drugs has negative effects on the cardiovascular system and is one of the causes of serious cardiovascular pathologies, ranging from abnormal heart rhythms to heart attacks and sudden cardiac death. The reactive oxygen species generation, toxic metabolites formation, and oxidative stress play a significant role in cocaine-induced cardiotoxicity. The aim of the present review is to assess acute and chronic cocaine toxicity by focusing on the published literature regarding oxidative stress levels. Hypothetically, this study can serve as a basis for developing a rapid and effective method for determining oxidative stress levels by monitoring changes in the redox status of patients with cocaine intoxication.
Clinical Safety and Tolerability of A2NTX, a Novel Low-Molecular-Weight Neurotoxin Derived from Botulinum Neurotoxin Subtype A2, in Comparison with Subtype A1 Toxins
Authors: Takeuchi Toshiaki , Okuno Tsuyoshi , Miyashiro Ai , Kohda Tomoko , Miyamoto Ryosuke , Izumi Yuishin , Kozaki Shunji , Kaji Ryuji
Published: December 2021

All the botulinum type A neurotoxins available for clinical use are of the A1 subtype. We developed a subtype A2 low-molecular-weight (150 kD (kilo Dalton)) neurotoxin (A2NTX) with less spread and faster entry into the motor nerve terminal than A1 in vitro and in vivo. Preliminary clinical studies showed that its efficacy is superior to A1 toxins. We conducted an open study exploring its safety and tolerability profile in comparison with A1LL (LL type A1 toxin, or onabotulinumtoxinA) and a low-molecular-weight (150 kD) A1 neurotoxin (A1NTX). Those who had been using A1LL (n = 90; 50–360 mouse LD50 units) or A1NTX (n = 30; 50–580 units) were switched to A2NTX (n = 120; 25–600 units) from 2010 to 2018 (number of sessions ~27, cumulative doses ~11,640 units per patient). The adverse events for A2NTX included weakness (n = 1, ascribed to alcoholic polyneuropathy), dysphagia (1), local weakness (4), and spread to other muscles (1), whereas those for A1LL or A1NTX comprised weakness (n = 2, A1NTX), dysphagia (8), ptosis (6), local weakness (7), and spread to other muscles (15). After injections, 89 out of 120 patients preferred A2NTX to A1 for the successive sessions. The present study demonstrated that A2NTX had clinical safety up to the dose of 500 units and was well tolerated compared to A1 toxins.
Toxic Effects of Aflatoxin B1 in Chinese Sea Bass (Lateolabrax maculatus)
Authors: Peng Kai , Chen Bing , Zhao Hongxia , Huang Wen
Published: December 2021

This study was performed to assess the effects of dietary aflatoxin B1 (AFB1) on the growth, antioxidant and immune response, digestive enzyme activities, and intestinal morphology of Lateolabrax maculatus during a 56-day feeding trial. Four diets were formulated including 0, 0.1, 0.5, and 1.0 mg/kg of AFB1. Each diet was randomly assigned to 3 fish tanks with 40 fish per tank. Results indicated that the fish’s final body weight, weight gain rate, specific growth rate, feed intake, condition factor, viscerosomatic index, hepatosomatic index, and intestinesomatic index decreased (p < 0.01) as dietary AFB1 increased. AFB1 levels in diets increased (p < 0.05) serum total antioxidant capacity (TAOC), superoxide (SOD), catalase, malondialdehyde (MDA), alkaline phosphatase (AKP), and lysozyme (LZM), and increased (p < 0.05) the TAOC, SOD, MDA, AKP, LZM, and immunoglobulin M in the livers of the fish. Dietary AFB1 decreased (p < 0.05) intestinal trypsin activity and induced intestinal injury. In summary, dietary AFB1 up to 1.0 mg/kg was toxic to L. maculatus as judged by reduced growth, enhanced antioxidant and immune response, decreased intestinal trypsin activity, and impaired intestinal morphology.
Biological and Inflammatory Effects of Antigen 5 from Polybia paulista (Hymenoptera, Vespidae) Venom in Mouse Intraperitoneal Macrophages
Authors: Bazon Murilo Luiz , Fernandes Luis Gustavo Romani , Assugeni Isabela Oliveira Sandrini , Pinto Lucas Machado , Simioni Patrícia Ucelli , Zollner Ricardo de Lima , Braga Márcia Regina Brochetto
Published: December 2021

The social wasp Polybia paulista (Hymenoptera, Vespidae) is highly aggressive, being responsible for many medical occurrences. One of the most allergenic components of this venom is Antigen 5 (Poly p 5). The possible modulation of the in vitro immune response induced by antigen 5 from P. paulista venom, expressed recombinantly (rPoly p 5), on BALB/c mice peritoneal macrophages, activated or not with LPS, was assessed. Here, we analyzed cell viability changes, expression of the phosphorylated form of p65 NF-κB subunit, nitric oxide (NO), proinflammatory cytokines production, and co-stimulatory molecules (CD80, CD86). The results suggest that rPoly p 5 does not affect NO production nor the expression of co-stimulatory molecules in mouse peritoneal macrophages. On the other hand, rPoly p 5 induced an increase in IL-1β production in non-activated macrophages and a reduction in the production of TNF-α and MCP-1 cytokines in activated macrophages. rPoly p 5 decreased the in vitro production of the phosphorylated p65 NF-κB subunit in non-activated macrophages. These findings suggest an essential role of this allergen in the polarization of functional M2 macrophage phenotypes, when analyzed in previously activated macrophages. Further investigations, mainly in in vivo studies, should be conducted to elucidate Polybia paulista Ag5 biological role in the macrophage functional profile modulation.