bluuebunny/crossref_metadata_2025 huggingface dataset:
Utilizing outer membrane proteins (OMPs) as a vaccine to manage motile Aeromonas septicemia (MAS) in Nile tilapia (Oreochromis niloticus) with evaluating the vaccine immunoprotective effectiveness
Authors: Matter Aya F. , El Asley Amel M. , Abbass Amany A. , Shaheen Adel A.
Published: May 2024

Motile aeromonads are an opportunistic and heterogenic bacteria that cause motile Aeromonas septicemia (MAS) which is accompanied with variety of clinical signs and lesions in fish. It has been found that their outer membrane proteins (OMPs) are highly immunogenic and may be used as a vaccine candidate. The present study was undertaken to evaluate OMP protection against Aeromonas hydrophila (A. hydrophila) strain ATCC 7966 (A5 and A8) and A. hydrophila strain DSM 30,187 (A6). Pathogenicity tests revealed that out of 12 isolated strains, seven were highly pathogenic, three were moderate, and two were avirulent. SDS-PAGE analysis of OMPs showed several protein bands (7–22) of different molecular weights ranging from 14 to 346 kDa. The common protein band was 39 kDa. It seems that pathogenicity and the number of protein bands are related in the highly pathogenic strains. Challenged A. hydrophila for Nile tilapia (O. niloticus) previously actively immunized with OMPs (A4, A5, A6, A8, and A11) showed a significant increase in relative percent survival (RPS) ranging from 50 to 100%. Immunological parameters such as immunoglobulin M (IgM), antioxidants (SOD, GSH, and CAT), and nitric oxide (NO) and expression of pro-inflammatory cytokines, interleukin 1β (IL-1β), and tumor necrosis factor-α (TNFα) showed a significant increase in OMP-immunized fish. Challenged A. hydrophila for O. niloticus previously passively immunized with OMPs (A4, A5, A6, A8, and A11) in fish-raised sera showed a significant increase in RPS (20 to 100%) in the vaccinated groups. It is concluded that OMPs from Aeromonas spp. have been identified as suitable target for protection development, especially in the case of heterogenic bacteria.
In-situ synthesis and binding of silver nanoparticles to dialdehyde and carboxylated cellulose nanofibrils, and active packaging therewith
Authors: Aouay Mohamed , Aguado Roberto J. , Bayés Genís , Fiol Núria , Putaux Jean-Luc , Boufi Sami , Delgado-Aguilar Marc
Published: May 2024

The present work reveals the potential application of dialdehyde and carboxylated nanocellulose for the in-situ reduction of Ag+ and immobilization as silver nanoparticles (AgNPs) on cellulose surfaces. Tollens’ reagent (Ag(NH3)2OH) at concentrations ranging from 5·10–3 to 10–1 M was incorporated in both dialdehyde cellulose (DAC) and dialdehyde-modified TEMPO-oxidized cellulose nanofibers (DA-TOCNFs). The results showed that DA-TOCNFs facilitated faster reduction of Ag+ and effective immobilization of AgNPs on the nanocellulose surface. The resulting suspensions exhibited stability and demonstrated strong antimicrobial activity against Bacillus subtilis when coated on paper surfaces. Importantly, the coated papers did not show significant silver migration to food simulants B (3 vol% acetic acid) and D1 (ethanol/water mixture, 50 vol%), indicating the potential of these suspensions for active food packaging. The advantages of using DA-TOCNFs over DAC were attributed to their higher cationic demand and ζ-potential, resulting in a higher density of binding sites. Moreover, the charged and entangled network of DA-TOCNFs allowed for the individualization of AgNPs, unlike DAC, where some agglomerations were observed. Overall, this study presents an improved single-step process for the synthesis of AgNPs on nanocellulose surfaces, highlighting their potential for safe and high-performance applications in food packaging. Paper sheets coated with nanocellulose/AgNPs suspensions fully inhibited the growth of B. subtilis, at least for one month after coating, and caused damage to their cell membranes. This research provides a one-pot facile route to fabricating hybrid nanocellulose/AgNPs systems, stable in water, and may be used directly as a coating layer for board and paper active packaging with little or even undetectable release of Ag.
Shape optimization for interface identification in nonlocal models
Authors: Schuster Matthias , Vollmann Christian , Schulz Volker
Published: May 2024

Shape optimization methods have been proven useful for identifying interfaces in models governed by partial differential equations. Here we consider a class of shape optimization problems constrained by nonlocal equations which involve interface–dependent kernels. We derive a novel shape derivative associated to the nonlocal system model and solve the problem by established numerical techniques. The code for obtaining the results in this paper is published at (https://github.com/schustermatthias/nlshape).
Occupation, Organisation, Opportunity, and Oversight: Law Firm Client Accounts and (Anti-)Money Laundering
Authors: Benson Katie , Bociga Diana
Published: May 2024

The misuse of law firm pooled client accounts has been identified as one of the primary areas of money laundering and terrorist financing risk for the legal profession. This article demonstrates the varied role that client accounts can play in money laundering, through both purposeful exploitation (by the predicate offender, the lawyer/law firm, or both) of the client account or of other legitimate business processes in which the client account inevitably plays a role, and/or a failure to fulfil regulatory requirements. It examines how the nature of law firm pooled client accounts in the UK creates and shapes an ‘opportunity structure’ for money laundering, and the occupational and organisational context of this opportunity structure. The article argues that examining the opportunity structures created by client accounts is a more useful approach than categorising them as inherently low, medium or high risk, as is seen in many national risk assessments and reports. Identifying the factors that create opportunities for money laundering through law firm client accounts can direct policymakers striving to prevent money laundering in the legal profession towards more targeted oversight mechanisms.
Teachers’ digital competency level according to various variables: A study based on the European DigCompEdu framework in a large Turkish city
Authors: Suzer Emre , Koc Mustafa
Published: May 2024

The aim of this study is to determine teachers’ digital competency on the basis of European DigCompEdu framework and its relationships with some demographic and teacher characteristics. It was designed as a cross–sectional survey within the quantitative research paradigm. The sample consisted of 368 (199 male and 169 female) teachers working in a major city located in the Central Anatolia of Türkiye during the 2021–2022 academic year. Data were collected through a questionnaire including the Digital Competencies Scale for Educators and questions regarding teachers’ demographic and professional characteristics such as age, gender, subject taught, educational background, school level and location of employment. The findings reveal that participating teachers are at the integrator (B1) level of digital competency on average and those who are male, teach math and science related courses, have postgraduate degree, and work in metropolitan cities are more digitally competent than their counterparts. Teachers’ digital competency is independent of their age and type of school whereas it is positively and moderately associated with the number of digital devices teachers had. Furthermore, the regression analysis explains 25% of its variance through gender, educational background, subject and the number of information technology devices as being the significant predictors.
Analytics of motivational factors of educational video games: LDA topic modeling and the 6 C’s learning motivation model
Authors: Chen Yitong , Xie Zerong , Chiu Dickson K.W.
Published: May 2024

This research studies the motivational factors used in educational video games through the lens of 6 C’s learning motivation model with text mining of the players’ reviews and comments. This research seeks to offer insight for game producers and educational institutions to investigate the effectiveness of these motivators for increasing player motivations and thus improving the quality of learning. Sentiment analysis and LDA topic modeling were used to analyze reviews of five selected video games on the Steam platform. The 6 C’s Learning Motivation Model guided text mining to analyze the motivational factors used in the games and how they contribute to user learning. The effectiveness of these motivational factors was discussed in conjunction with categorized text mining. Results show that the major motivation factors of educational games are ‘construction meaning’, ‘challenge’, and ‘control’ in the 6 C’s learning motivation model. Among them, users focus on whether the game’s content meets their interests and the construction of the educational meaning of the game. The advantage of control, a high degree of motivational factor in video games, may turn out to be a factor that leads to user churning when the game is not interesting or attractive enough. Previous educational game research seldom involved a large sample size for generalizable findings. In addition, this research extends the application of the 6 C’s learning motivation model to the digital educational gaming arena, providing a novel player-centric perspective. Based on the results, we provide recommendations and design considerations for educational game developers to enhance players’ experience and motivations.
Effects of electronic cash registers on reported revenue
Authors: Engström Per , Hagen Johannes , Khoshghadam Alireza , Schneider Andrea
Published: May 2024

We assess the impact of a Swedish regulatory change, which required businesses with any business-to-consumer transactions, whether by cash or card, to use a certified electronic cash register (ECR), on reported revenue. To do this, we use administrative data on the monthly reported revenue of all affected firms and a staggered difference-in-differences approach. Our findings indicate that there was an immediate increase of about 2.7–4.3% in reported revenue following the implementation of a certified ECR. However, the effect was temporary and diminished to zero after just a few months, which indicates that firms found innovative methods to underreport their revenue.
How good is teleworking? Development and validation of the tele attitude scale
Authors: Junça-Silva Ana , Caetano António
Published: May 2024

The objective of this study was to develop and validate a measure called the Tele Attitude Scale (TAS). This measure aims to evaluate relevant aspects of the teleworking experience related to its perceived effects regarding, for instance: job characteristics, perceived productivity, quality of work-related interactions, work-non-work balance, and well-being. Four studies were conducted between 2021 and 2022. First, a qualitative study was conducted to develop the scale (N = 80). Afterward, a second study to explore the scale’s factorial structure (N = 602) was developed. A third study served to analyze its internal validity and reliability (N = 232). A fourth study analyzed the criterion validity of the scale by exploring its correlations with measures of health, affect, and performance (N = 837 teleworkers). The findings revealed that the 10-item scale accounted for a unique factor and that it was a reliable measure. Moreover, the results also showed that the scale was significantly related to measures of health, affect, and performance, thus supporting its convergent and criterion validity. This research advances the knowledge about telework by proposing a user-friendly scale to measure teleworking, specifically how workers perceive their experience of it and how it may impact them at several levels. Thus, the TAS can not only fill a gap in the research but also help organizations evaluate and support teleworkers’ needs and subsequent satisfaction while teleworking.
What is mental health and disorder? Philosophical implications from lay judgments
Authors: Varga Somogy , Latham Andrew J.
Published: May 2024

How do people understand the concepts of mental health and disorder? The objective of this paper is to examine the impact of several factors on people’s judgments about whether a condition constitutes a mental disorder or a healthy state. Specifically, this study examines the impact of the source of the condition, its outcome, individual valuation (i.e., the value the individual attaches to the condition), and group valuation (i.e., the value the relevant group attaches to the condition). While we find that people’s health and disorder judgments are driven by perceived dysfunction, we also find that health and disorder judgments are impacted differently by these factors. Health judgements are impacted by outcome and individual valuation, and disorder judgments are impacted by condition source. These results suggest that the folk concept of mental health is positive (i.e., mental health is more than the absence of mental disorder) and normativist (i.e., value judgments play a significant role in determining whether a condition counts as healthy), while the concept of mental disorder aligns with a naturalist perspective, at least to the extent that dysfunction plays an important role in categorizing a condition as a disorder. However, our finding that people’s dysfunction judgments are influenced by individual valuation and outcomes poses a strong challenge to naturalist accounts.
Coexistence field trials between MON810 and conventional maize in Mallorca as a basis for a regional regulatory proposal based on scientific evidence in the times of genome editing
Authors: Vives-Vallés Juan Antonio , Corujo Maria , Pla Maria , Galmés Jeroni
Published: May 2024

This paper reports the first coexistence field trials between transgenic and conventional maize carried out under Mediterranean island conditions. Their purpose was to assess the local validity of pollen barriers and sowing delays as coexistence strategies as a basis for a regional regulation on the subject. Two field trials were performed in two agricultural states of Alcudia and Palma, in Mallorca (Spain). In the first one, two adjacent plots were synchronously sown with conventional and transgenic maize, respectively. In the second trial, the previous design was replicated, and two additional plots sown with GM maize were added, paired with their respective conventional recipient plots sown 2 and 4 weeks later. All conventional plots were located downwind from their respective GM plots. Of the two conventional plots in sowing synchrony, only one of them required a 2.25 m pollen barrier to meet the 0.9% labeling threshold. A 4-week sowing delay between GM and non-GM plots proved to be enough to keep the GM content of the recipient plots below the legal threshold. However, with a 2-week sowing delay additional coexistence measures such as pollen barriers might be needed, as suggested in the literature. Results are consistent with previous research conducted in the northeast of Spain, thus validating in the island’s agroclimatic conditions a model successfully tested in that peninsular region which allows to accurately estimate the need and width of pollen barriers. The results presented here could perhaps be extrapolated to other islands, coastal areas, and regions with stable prevailing winds during the maize flowering season.
Exploring the Link Between Sensory Processing and Psychopathology in a Community Sample of Young Adults: Bayesian Network Analyses
Authors: Escelsior Andrea , Murri Martino Belvederi , Polena Luis , Petrilli Giulia , Zizzi Alessio , Inuggi Alberto , Bode Juxhin , Engel-Yeger Batya , da Silva Beatriz Pereira , Gori Monica , Amore Mario , Serafini Gianluca
Published: May 2024

Sensory processing is a fundamental aspect of  human experience, and varies significantly between individuals, potentially affecting individual functioning, behaviour, and mental health. This study investigated the associations between sensory processing and psychopathology in a sample of the general population. Participants responded to a general psychiatric screening tool (DSM-5 Self-Rated Level 1 Cross-Cutting Symptom Measure-Adult) and to the Adolescent/Adult Sensory Profile (AASP) questionnaire. The sample comprised 1108 young adults (77.25% females, mean age 22.6). Data were analysed using item response theory and Bayesian network analyses, revealing specific associations between sensory profiles and psychopathological dimensions. Specifically, we detected associations between the low registration sensory profile and the dimensions of psychosis, substance use, and mania. Sensation seeking was associated with mania. Sensory sensitivity was related to depression and mania, while sensation avoiding was inversely correlated with mania. These findings suggest that reduced external sensory awareness may be linked to a predisposition to psychosis, while a multifaceted sensory processing pattern may indicate vulnerability to mood disorders. Assessing sensory processing could yield crucial insights into individual susceptibilities to mental disorders and help identify targeted preventive and therapeutic strategies
A proactive transshipment model for prototype parts logistics in the automotive industry
Authors: Weckenborg Christian , Vorwerk Bastian , Spengler Thomas S.
Published: May 2024

In the logistics of prototype parts in the automotive industry, unique parts are stored in warehouses and provided to assembly service providers to ensure a timely assembly of the associated prototype vehicles. As the allocation of the assembly orders to the assembly service providers may change before the start of the assembly, the shipments are planned at short notice. This article considers the short-term task of planning shipments of individual prototype parts from multiple warehouses to multiple assembly service providers. The current literature on planning shipments focuses mainly on parts available in batch sizes larger than one. However, as prototype parts are individual, storing them in adequate warehouses is crucial. A mixed-integer linear programming model for planning transshipments of parts between the warehouses and shipments to the assembly service providers to minimize overall costs is presented. The model enables the utilization of spare capacities of planned transports for a proactive transshipment of parts between warehouses. To this end, the future shipment costs of parts to assembly service providers are approximated to determine suitable warehouses. A numerical study shows that the proactive approach leads to a considerable cost reduction.
Robotic ambulatory colorectal resections: a systematic review
Authors: Ho Joachim Cheng En , Goel Aryan Raj , Fung Adriel Heilong , Shaikh Irshad , Iqbal Muhammad Rafaih
Published: May 2024

Colorectal surgery has progressed greatly via minimally invasive techniques, laparoscopic and robotic. With the advent of ERAS protocols, patient recovery times have greatly shortened, allowing for same day discharges (SDD). Although SDD have been explored through laparoscopic colectomy reviews, no reviews surrounding robotic ambulatory colorectal resections (RACrR) exist to date. A systematic search was carried out across three databases and internet searches. Data were selected and extracted by two independent reviewers. Inclusion criteria included robotic colorectal resections with a length of hospital stay of less than one day or 24 h. 4 studies comprising 136 patients were retrieved. 56% of patients were female and were aged between 21 and 89 years. Main surgery indications were colorectal cancer and recurrent sigmoid diverticulitis (43% each). Most patients had low anterior resections (48%). Overall, there was a 4% complication rate postoperatively, with only 1 patient requiring readmission due to postoperative urinary retention (< 1%). Patient selection criteria involved ASA score cut-offs, nutritional status, and specific health conditions. Protocols employed shared similarities including ERAS education, transabdominal plane blocks, early removal of urinary catheters, an opioid-sparing regime, and encouraged early oral intake and ambulation prior to discharge. All 4 studies had various follow-up methods involving telemedicine, face-to-face consultations, and virtual ward teams. RACrRs is safe and feasible in a highly specific patient population; however, further high-quality studies with larger sample sizes are needed to draw more significant conclusions. Several limitations included small sample size and the potential of recall bias due to retrospective nature of 2 studies.
Trait hedonic capacity correlates with sexual pleasure and motives for sexualized drug use in young adults
Authors: Bernecker Katharina , Becker Daniela , Weitkamp Katharina , Wehrli Fabienne
Published: May 2024

Although pleasure is a primary motivator for sexual activity, research into the mechanisms facilitating pleasurable sexual experiences is limited. The present research adopts a self-regulatory perspective on sexual pleasure, investigating individuals’ capacity to shield hedonic activities from distracting thoughts (trait hedonic capacity) as a correlate of sexual pleasure and sexualized drug use. Study 1 (N = 247) demonstrates that young adults with higher trait hedonic capacity experience more sexual pleasure and are less prone to cognitive distraction during partnered sexual activities. Pre-registered Study 2 replicates these findings while accounting for demand effects (N = 182, n = 86). Expanding on these findings, pre-registered Study 3 (N = 903) shows that young adults with lower trait hedonic capacity are more inclined to use alcohol as a means of coping with cognitive distraction during sexual activity. Exploratory moderation analyses suggest that this is particularly true for women and individuals with higher levels of stress. In summary, low trait hedonic capacity is associated with lower sexual pleasure and a tendency to use alcohol with the motivation to cope with distracting thoughts during partnered sexual activity.
Development and validation of the Enright Forgiveness Inventory 30-item version in Argentina
Authors: Fariña Francisca , Zhao Xiang , Novo Mercedes , Rique Julio , Oyhamburu María Silvia
Published: May 2024

Research on forgiveness has received growing academic interest. The Enright Forgiveness Inventory (EFI) is one of the most widely used interpersonal forgiveness measures in the world. However, its validation study had not been conducted in Latin America. This study aimed to investigate the structural validity of the EFI 30-item version (EFI-30) in Argentina. An online survey was administrated including the EFI-30 and a social desirability scale, as well as demographic questions. A convenience sample (N = 472) was recruited. All participants were originally from Argentina, and 47.2% were married or cohabiting in a relationship. Factor analysis was used to evaluate structural validity. Part of the EFI-30 is a single-item forgiveness question that was used to examine the inventory’s convergent validity. Other conventional psychometric tests were also performed to validate the previous analyses. The results confirmed the six-factor structure of the EFI-30, namely, positive affect, negative affect, positive behaviour, negative behaviour, positive cognition, and negative cognition. Findings are consistent with previous validation studies across countries. The strong scalability of the Argentine EFI-30 provides multiple avenues for future research. The study might be replicated among other demographic groups (e.g., adolescents) in Argentina.
Exploring the interplay between individual and family functioning during the COVID-19 pandemic: a cross-sectional study
Authors: Lucia La Rosa Valentina , Tornatore Miriana , Commodari Elena
Published: May 2024

Family relationships are central to an individual’s development and influence their emotional, relational, and social trajectories. Optimal family functioning, encompassing emotional connections, communication patterns, and coping mechanisms, is pivotal to the well-being of individual family members, especially during challenging periods such as the COVID-19 pandemic. From this perspective, this study, conducted during the second wave of the COVID-19 pandemic in Italy, assessed the interplay between individual and family functioning. Utilizing Hill's ABC-X model, we explored how the pandemic (stressor) impacted family dynamics (resources), perceived individual affectivity and family efficacy (perception), thereby influencing family quality of life (outcome). Four hundred and four participants completed a battery of standardized questionnaires to evaluate perceived individual affectivity during the pandemic, family quality of life, family dynamics (cohesion, flexibility, and communication), family conflict, family efficacy, and family coping strategies. Positive affectivity was associated with better family quality of life and more adaptive family coping strategies. The sample reported a low family quality of life and low family cohesion, flexibility, and communication during the pandemic. A positive sense of family cohesion, flexibility, and communication was associated with better individual well-being, better family quality of life and efficacy, and less conflict. Family communication was the strongest predictor of family quality of life in the study sample. In conclusion, our results emphasize the importance of strengthening family and individual resilience in transforming post-pandemic challenges into psychological and familial growth opportunities.
Effectiveness of hydrotherapy and balneotherapy for anxiety and depression symptoms: a meta-analysis
Authors: Koroglu Sevgi , Yıldız Metin
Published: May 2024

Depression and anxiety are common mental health problems that negatively affect the quality of life. Functioning, social relationships, daily activities, and physical health are negatively affected. Therefore, it is very important to manage these problems and to investigate effective treatments for individuals to lead a healthy life. This study aims to evaluate the effect of hydrotherapy and balneotherapy on anxiety and depression. Randomized controlled trials published in the last 20 years comparing hydrotherapy and balneotherapy with active control or waiting lists in adults with anxiety and depressive symptoms were included. Pubmed, Cochrane, Scopus, Web of Science, and CINAHL databases were searched until August 2023. The random effects model and fixed effects model were used for data analysis. The heterogeneity of the study was assessed using the I2 index, and publication bias was assessed using Egger and Begg tests and funnel plots. Seventeen eligible studies with a sample size of 977 participants were selected. After data analysis, the results showed that hydrotherapy and balneotherapy led to a statistically significant reduction in anxiety scores (SMD: 0.46 95% CI: 0.27, 0.65), depression scores (SMD: 0.53 95% CI: 0.38, 0.67). Subgroup analysis based on intervention type showed that balneotherapy reduced anxiety scores (SMD: 0.46, 95% CI: 0.27, 0.65) but not depression scores. Evidence suggests that hydrotherapy and balneotherapy can reduce anxiety and depression in adults. Based on these findings, hydrotherapy and balneotherapy can be applied as an adjunct to standard treatments to improve the mental health of adults.

Registration: The study protocol was registered in the International Register of Prospective Systematic Reviews (PROSPERO) with accession number CRD42023448993.
Rethinking Pliny’s “Sicilian Crocus”: Ecophysiology, Environment, and Classical Texts
Authors: Birney Kathleen J.
Published: May 2024

Classical scholars have long held that the saffron in widespread use throughout the ancient Mediterranean wasCrocus sativus(Iridaceae), a sterile triploid descendant of the wildCrocus cartwrightianus, and indeed use ofCrocus sativusin antiquity has been extensively borne out both by iconographic and phylogenetic studies. Two principal scholars of the Roman world, Dioscorides the physician and Pliny the natural historian, disagreed radically over the virtues and commercial value of saffron crocus from Sicily, with one praising its quality, and the other excoriating it. This study draws on ecophysiology, classical texts, environmental archeology, and phytochemistry to explain this disagreement and its implications. It explores the potential impact of microclimate on crocus cultivation in the ancient Mediterranean and proposes a new species identification for Sicilian crocus:Crocus longiflorus. The identification ofCrocus longiflorusas “Sicilian saffron” offers an important corrective to the assumption thatCrocus sativuswas the sole crocus species of commercial value in the ancient Mediterranean and renews attention to the economic potential and utility of an indigenous southern Italian species overlooked in classical and later scholarship.
The potential of human pose estimation for motion capture in sports: a validation study
Authors: Fukushima Takashi , Blauberger Patrick , Guedes Russomanno Tiago , Lames Martin
Published: May 2024

Thanks to the advancement of computer vision technology and knowledge, the accuracy of human pose estimation has improved to the level that can be used for motion capture. Especially, human pose estimation has been gaining attention in research due to its efficiency and accuracy. The traditional motion capture system is not accessible to everyone. Human pose estimation could be a solution to replace the traditional system. However, the validity of human pose estimation has not been investigated enough yet in athletic and sports contexts. For this reason, this research aims to validate the kinematic measurements of human pose estimation by comparing them against the measurement of marker-based motion capture system. Five participants were recruited and asked to perform eight athletic and nine sports movements, respectively while being captured by normal and infrared cameras. Human pose estimation was run on frames from the RGB cameras to estimate human landmarks. From estimated landmarks in human pose estimation and marker-based motion capture system, elbow, shoulder, hip, and knee joint angles on the left and right sides were calculated and compared. Mean absolute error was used to evaluate the accuracy of human pose estimation measurements. The mean errors for athletic and sports movements were 9.7 ± 4.7 degrees and 9.0 ± 3.3 degrees, respectively. Errors were generally largest for elbow joint angles. The errors might be due to occlusion and systematic differences between human pose estimation and marker-based motion capture system. In conclusion, human pose estimation contains room for improvement, but has the potential to be used in some applications in which strictly precise measurements are not required.
Enhanced groundwater availability through rainwater harvesting and managed aquifer recharge in arid regions
Authors: Abd-Elaty Ismail , Kuriqi Alban , Ahmed Ashraf , Ramadan Elsayed M.
Published: May 2024

Climate change in desert areas and semi-arid watersheds may offer a promising solution for the water scarcity problem that Bedouins and local inhabitants face. This study investigated the integrated water resources management in arid and semi-arid regions using rainwater harvesting in combination with the managed aquifer recharge (RWH-MAR) technique. The study also used recharge wells and storage dams to achieve the sustainability of groundwater supplies in the context of climate change and management of the flow to the Gulf of Suez. Therefore, different return periods of 10, 25, 50, and 100 years were considered for the annual flood volume resulting from those watersheds. Moreover, hydrologic modeling was carried out for the El Qaa plain area, South Sinai, Egypt, using the Watershed Modeling System (WMS) and the groundwater modeling of SEAWAT code. Our findings show that for different scenarios of climate change based on  return periods of 10, 25, 50, and 100 years, the aquifer potentiality reached 24.3 MCM (million cubic meters) per year, 28.8 MCM, 36.7 MCM, and 49.4 MCM compared to 21.7 MCM at 2014 with storage of groundwater ranges 11.8%, 32.1%, 69%, and 127.4%, respectively. These findings have significant implications for the system of RWH-MAR and groundwater sustainability in El Qaa Plain, South Sinai. The RWH-MAR proved to be an effective approach that can be applied in different water-stressed and arid regions to support freshwater resources for sustainable future development and food security, as well as protect communities from extreme flash flood events.
Experimental study on the pseudo threshold pressure gradient of supported fractures in shale reservoirs
Authors: Gao Jidong , Zhu Weiyao , Li Aishan , He Yuexiang , Zhang Liaoyuan , Kong Debin
Published: May 2024

Pseudo threshold pressure gradient (PTPG) exists in the propped fractured reservoir, but its nonlinear flow law remains unclear. The effects of the mineral composition of shale and microstructure of fracturing fluid on PTPG were analyzed by X-ray diffraction and liquid nitrogen quick-freezing method. The results demonstrate that a proppant with a large particle size is more likely to form an effective flow channel and reduce liquid flow resistance, thus decreasing PTPG and increasing conductivity. The polymer fracturing fluid with rectangular microstructures significantly increased the PTPG supporting the fractured core. Experimental results show that the PTPG of the resin-coated sand-supported core in the fracturing fluid with a concentration of 1.2% is 245 times higher than that in the fracturing fluid with a concentration of 0.1% when the confining pressure is 5 MPa. Wetting hysteresis and the Jamin effect are responsible for the rise of PTPG in two-phase flow. The equivalent fracture width shows a good power function relationship with the PTPG. Thus, this study further explains the nonlinear flow behavior of reservoirs with fully propped fractures.
Maximizing the capacity and benefit of CO2 storage in depleted oil reservoirs
Authors: Sang Qian , Yin Xia , Pu Jun , Qin Xuejie , Gou Feifei , Fang Wenchao
Published: May 2024

Sequestering CO2 in depleted oil reservoirs provides one of the most appealing measures to reduce greenhouse gases (GHG) concentration in the atmosphere. The remaining liquids after enhanced oil recovery (EOR) processes, including residual oil and remaining water, lead to the main challenges to this approach. How to effectively evacuate a depleted oil reservoir by recovering not only residual oil but also remaining water is a critical consideration for this type of CO2 sequestration. This paper presents conceptual investigations concerning the methods which effectively evacuate depleted oil reservoirs from both the displacement efficiency and the sweep efficiency points of view. To improve the displacement efficiency, surfactant slug and solvent slug injection was examined using a core scale numerical model. Investigations regarding improving sweep efficiency, such as horizontal well pattern infilling and foam injection, were carried out based on a typical row well pattern. Simulation results showed that surfactant slug which modified the relative permeability and capillary pressure remarkably reduced both residual oil saturation and remaining water saturation. A CO2 slug injected before surfactant slug can help improve the oil recovery. Solvent enriched CO2 slug also remarkably reduced the residual oil saturation to as low as 2%. Horizontal well pattern infilling had great advantage for thick or inclined reservoirs, and foam slug injection greatly improved CO2 storage capacity in thin reservoirs by improving the sweep efficiency. Maximum mobility reduction (MRF) is the most important parameter to maximize the storage capacity and the benefit. The variation of CO2 storage capacity along with CO2 slug size. Larger foam slug size will play a better storage performance. The conceptual simulation investigations confirmed that depleted oil reservoirs can be effectively evacuated for CO2 storage. Depleted oil reservoirs with maximum evacuation are the best candidates for CO2 sequestrations.
Can Urban Air Mobility become reality? Opportunities and challenges of UAM as innovative mode of transport and DLR contribution to ongoing research
Authors: Pak Henry , Asmer Lukas , Kokus Petra , Schuchardt Bianca I. , End Albert , Meller Frank , Schweiger Karolin , Torens Christoph , Barzantny Carolina , Becker Dennis , Ernst Johannes Maria , Jäger Florian , Laudien Tim , Naeem Nabih , Papenfuß Anne , Pertz Jan , Prakasha Prajwal Shiva , Ratei Patrick , Reimer Fabian , Sieb Patrick , Zhu Chen , Abdellaoui Rabeb , Becker Richard-Gregor , Bertram Oliver , Devta Aditya , Gerz Thomas , Jaksche Roman , König Andreas , Lenz Helge , Metz Isabel C. , Naser Fares , Schalk Lukas , Schier-Morgenthal Sebastian , Stolz Maria , Swaid Majed , Volkert Andreas , Wendt Kristin
Published: May 2024

Urban Air Mobility (UAM) is a new air transportation system for passengers and cargo in urban environments, enabled by new technologies and integrated into multimodal transportation systems. The vision of UAM comprises the mass use in urban and suburban environments, complementing existing transportation systems and contributing to the decarbonization of the transport sector. Initial attempts to create a market for urban air transportation in the last century failed due to lack of profitability and community acceptance. Technological advances in numerous fields over the past few decades have led to a renewed interest in urban air transportation. UAM is expected to benefit users and to also have a positive impact on the economy by creating new markets and employment opportunities for manufacturing and operation of UAM vehicles and the construction of related ground infrastructure. However, there are also concerns about noise, safety and security, privacy and environmental impacts. Therefore, the UAM system needs to be designed carefully to become safe, affordable, accessible, environmentally friendly, economically viable and thus sustainable. This paper provides an overview of selected key research topics related to UAM and how the German Aerospace Center (DLR) contributed to this research in the project "HorizonUAM - Urban Air Mobility Research at the German Aerospace Center (DLR)". Selected research results on the topics of market potential and public acceptance, vehicle design (including battery degradation, onboard systems, cabin design, cabin simulation), infrastructure, operations (including U-space, safe autonomy, navigation, communication, cost modeling) and overall system modeling are briefly presented.
Efficacy of multivitamin support following bariatric surgery in patients with obesity: a prospective observational study
Authors: Basolo Alessio , Bechi Genzano Susanna , Vitti Jacopo , Salvetti Guido , Gilio Donatella , Ceccarini Giovanni , Scartabelli Giovanna , Lippi Chita , Bellini Rosario , Mancini Rudi , D’Imporzano Simone , Moretto Carlo , Angeli Valentina , Troiani Daniela , Fierabracci Paola , Jaccheri Roberta , Calderone Alba , Poma Anello M. , Chiovato Luca , Saponati Giorgio , Santini Ferruccio
Published: May 2024

Purpose

Bariatric surgery (BS), an effective treatment for severe obesity and its comorbidities, may result in micronutrient and vitamin deficiencies. This monocentric prospective observational study aimed at evaluating the efficacy of a specifically designed vitamin/mineral formula (Bariatrifast, BIOITALIA S.r.l., Italy) for preventing and treating micronutrient deficiencies in patients submitted to BS.

Methods

Twenty patients with severe obesity (mean weight and BMI: 123.5 kg (range 88–174) and 43.3 kg/m2 (range 37–54) respectively) underwent BS (10 vertical sleeve gastrectomy VSG, 10 Roux-en-Y gastric bypass, RYGB). The mean age was 49.9 years (range 27–68). After a presurgical visit (V0), follow-up visits were performed at 1, 3, 6 and 12 months after surgery (V1–V4). Recorded data included weight, height and BMI. A complete blood count, measurement of ferritin, folic acid, vitamin B12, ionized calcium, 25 OH vitamin D, parathyroid hormone (PTH) were obtained. Following BS, patients started the daily oral multivitamin and mineral supplement.

Results

All patients achieved a significant weight loss (mean − 34.7 ± 11.8 kg). No deficiencies of various vitamins/micronutrients were detected during the entire study period. The serum concentrations of vitamin B12, 25-OH Vitamin D and folic acid increased over the follow-up period compared with V0 (mean increase 243 ng/L, 23 µg /L, 8 µg/L, respectively). Compared to RYGB, patients who underwent sleeve gastrectomy showed higher levels of 25-OH vitamin D at V2, V3 and V4 (all p < 0.05), and higher levels of Vitamin B12 and folic acid at V4 (p < 0.05 and p < 0.005, respectively). No adverse events were reported.

Conclusion

Following VSG or RYGB, Bariatrifast administration was associated with normal values of essential micronutrients, and it was well-tolerated without evidence of gastrointestinal side effects.

Clinical Trial Registration ClinicalTrials.gov, identifiers NCT06152965
ATTACK-COSM: attacking the camouflaged object segmentation model through digital world adversarial examples
Authors: Li Qiaoyi , Wang Zhengjie , Zhang Xiaoning , Li Yang
Published: May 2024

The camouflaged object segmentation model (COSM) has recently gained substantial attention due to its remarkable ability to detect camouflaged objects. Nevertheless, deep vision models are widely acknowledged to be susceptible to adversarial examples, which can mislead models, causing them to make incorrect predictions through imperceptible perturbations. The vulnerability to adversarial attacks raises significant concerns when deploying COSM in security-sensitive applications. Consequently, it is crucial to determine whether the foundational vision model COSM is also susceptible to such attacks. To our knowledge, our work represents the first exploration of strategies for targeting COSM with adversarial examples in the digital world. With the primary objective of reversing the predictions for both masked objects and backgrounds, we explore the adversarial robustness of COSM in full white-box and black-box settings. In addition to the primary objective of reversing the predictions for masked objects and backgrounds, our investigation reveals the potential to generate any desired mask through adversarial attacks. The experimental results indicate that COSM demonstrates weak robustness, rendering it vulnerable to adversarial example attacks. In the realm of COS, the projected gradient descent (PGD) attack method exhibits superior attack capabilities compared to the fast gradient sign (FGSM) method in both white-box and black-box settings. These findings reduce the security risks in the application of COSM and pave the way for multiple applications of COSM.
Heavy metal application of response surface optimized-lipopeptide biosurfactant produced by Pseudomonas aeruginosa strain CGA-02 in low-cost substrate
Authors: Anaukwu Chikodili Gladys , Ekwealor Chito Clare , Anakwenze Vivian Nonyelum , Orji Chinedu Christian , Ogbukagu Chioma Maureen , Anyaoha Victoria Ihedinachi , Isiaka Amarachukwu Bernaldine , Green Stefan Joshua , Ekwealor Ikechukwu Amechi
Published: May 2024

Cost-effective methods of biosurfactant production with minimal environmental impact are needed as global demand continues to increase. This study evaluated lipopeptide biosurfactant production in a Pseudomonas aeruginosa strain CGA-02 using a low-cost carbon substrate. The structural properties of the biosurfactant and applicability of the biosurfactant in heavy metal removal were evaluated. Response surface methodology (RSM) involving central composite design (CCD) was used to optimize process parameters to maximize biosurfactant production. The study identified sugar cane molasses and sodium nitrate as carbon and nitrogen sources of choice for bacterial growth and biosurfactant production, with a relatively 2.64-fold increase in biosurfactant yield under optimized conditions. Analysis of the biosurfactant measured a surface tension reduction of water from 72.2 ± 0.26 to 30.5 ± 0.2 mN/m at 40 mg/L critical micelle concentration. GC–MS and FTIR analysis revealed structural properties of the lipopeptide biosurfactant, with fatty acid components predominantly 9-octadecenoic acid (oleic acid), n-hexadecanoic acid, cyclotetrasiloxane and trimyristin, and infrared peaks belonging to amine, carboxyl, nitrile, alkanol, ether and carbonyl groups. Capture of heavy metals using the biosurfactant was evaluated in soil microcosms. Removal rates of 80.47, 100, 77.57, 100, and 97.57% were recorded for As, Pb, Hg, Cd and Cr respectively after 12 weeks of incubation. There was no significant difference (p < 0.05) in the removal efficiency of the biosurfactant and an analogous chemical surfactant, sodium dodecyl sulphate. First and second-order kinetic models described heavy metal removal rates by the biosurfactant. We demonstrate the production of a useful biosurfactant using low-cost waste carbon.
Comparison of microstructure, mechanical, and electrochemical performance of laser-deposited FeCrV15 alloy at varying powder feed rates
Authors: Aramide Basiru Philip , Adegbola Taoreed Adesola , Jamiru Tamba , Popoola Abimbola Patricia Idowu , Adeoti Mathew Olurotimi , Sadiku Rotimi Emmanuel
Published: May 2024

In the realm of surface modification, repair, and reinforcement of components exposed to challenging operational conditions, such as tillage tools, laser cladding stands out as an innovative manufacturing technique. Employing this additive manufacturing approach, a functionally graded material with outstanding strength and properties is incorporated to enhance the desired attributes of the base material. This comparative investigation scrutinized and assessed the microstructural characteristics, hardness, wear resistance, and corrosion behavior of high carbon ferrochrome FeCrV15 coatings fabricated at two distinct powder feed rates, namely 5 and 6 g/min, respectively. The analysis delved into how the resultant coatings' molten bead deposition, microstructural evolution, hardness, wear resistance, and corrosion resistance were influenced by the powder feed rate. Evaluation of hardness was conducted using a Vickers microhardness testing apparatus, while phase identification was accomplished utilizing an X-ray diffractometer. The morphologies of the microstructures were scrutinized employing optical microscopy and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS). Furthermore, the corrosion response of the deposits in a soil–water environment was probed utilizing an Autolab potentiostat. A comprehensive assessment of the coatings' sliding wear performance was undertaken using an Anton Paar Tribometer. The findings of the study reveal that an escalation in the powder feed rate engenders heightened grain refinement within the microstructure, yielding a defect-free sample and augmenting the wear performance (with a wear rate of 2.42 × 10–6 mm3/N/m for sample B, surpassing 2.39 × 10–5 mm3/N/m for sample A and outstripping 1.72 × 10–3 mm3/N/m for the steel substrate). Additionally, the corrosion resistance is enhanced (with a corrosion rate of 0.0032 mm/yr for sample B, surpassing 0.0036 mm/yr for sample A, which, in turn, exceeds 0.1168 mm/yr for the steel substrate) in the case of sample B.