bluuebunny/crossref_metadata_2025 huggingface dataset:
Efficacy of chemo-mechanical caries removal: a 24-month randomized trial
Authors: Kitsahawong Kemporn , Seminario Ana Lucia , Pungchanchaikul Patimaporn , Rattanacharoenthum Anoma , Sutthiprapaporn Pipop , Pitiphat Waranuch
Published: December 2024

Introduction

Chemo-mechanical caries removal (CMCR) offers an alternative to conventional drilling for carious dentin removal, but limited evidence exists on its long-term effects on treating caries in primary teeth. The primary aims of this study were to compare CMCR to drilling in terms of restoration status and the presence of secondary caries after 24 months.

Methods

A randomized, parallel-group, single-blinded, controlled trial was conducted in Thailand. Participants were children aged 7–8 years with occlusal caries in second primary molars, randomly assigned to CMCR with Papacarie® (n = 242) or drilling (n = 246). All cavities were restored using glass ionomer cement. Completeness of caries removal was evaluated clinically by two blinded dentists, and patients' discomfort was measured using a facial visual analogue scale. Restoration status and development of secondary caries were assessed every six months clinically and every 12 months radiographically over a 2-year period.

Results

Both groups achieved complete caries removal, but the CMCR took significantly longer than the drilling method (9 vs. 2.3 min, p < 0.001). Children in the CMCR group reported significantly lower discomfort during treatment (p < 0.001). At 24 months, ten (4.6%) restorations in the CMCR group failed, compared to three (1.2%) in the drilling group. Clinically, four restorations (CMCR = 2, control = 2) exhibited secondary caries at the margin, while nine restorations (CMCR = 8, control = 1) showed radiographic evidence of secondary caries beneath the restoration. However, neither clinical nor radiographic evaluations revealed statistically significant differences in treatment outcomes at the two-year mark.

Conclusion

CMCR demonstrated comparable efficacy to conventional drilling for complete caries removal and restoration success at 24 months in primary teeth. Despite a longer chair time, it resulted in less discomfort during treatment.

Clinical Trial Registration

https://clinicaltrials.gov/study/NCT01641861, identifier: NCT01641861.
Performance and physical activity. How playful activities implemented into training in Danish esports clubs influence players' performance experience
Authors: Østergaard Lars Domino , Straszek Christian Lund Nørgaard , Frandsen Lasse Nørgaard
Published: December 2024

Introduction

Over the past few years, attention has focused on how physical activity can enhance esports players' performance. For example, complementing esports training with physical activities has been explored. However, most of these activities are based on traditional strength or endurance-related exercises, which do not align with the interests of children attending organized esports clubs.

Methods

In this study, we investigate playful physical activities. Our research is based on qualitative pilot studies, where we observed and interviewed players (N = 77) and coaches (N = 12) from nine organized esports clubs for two to four months per club. We explored their experiences with playful physical activities implemented during esports training. Using a reflexive thematic analytical approach, we revisited and analyzed the data.

Results

The results are presented in this paper as three nonfictional short stories, creatively describing the lived experiences of the players and coaches. We emphasize patterns of shared meaning and identify the “What's” and “How's” associated with esports training when playful physical activities are incorporated. Despite differences in form, duration, and intensity compared to activities referenced in the literature on esports and performance, our results demonstrate that playful activities positively influence esports players' skills and performance.

Discussion

Furthermore, our findings suggest that playful physical activities, as opposed to traditional strength and endurance exercises, often associated with physical activity, are acceptable for esports coaches. However, for maximum impact, these activities must be relevant and directly related to the games played in the esports clubs. Based on our research, we recommend implementing playful physical activities that align with the actual esports training to support developing and optimizing players' esports skills and performance.
China's electric vehicles adoption: implications for sustainable electricity, transportation, and net-zero emissions
Authors: Abudu Hermas , Sai Rockson , Hossin Md Altab , Botah Elvis Banoemuleng
Published: December 2024

Introduction

The rapid adoption of electric vehicles in China is a key strategy for decarbonizing the transportation sector, facilitating the transition to sustainable energy, and meeting the country's net-zero emissions goals. Notwithstanding this, limited research has explored how technological advancement influences electric vehicle adoption in the context of achieving sustainable electricity.

Methods

This study addresses this gap by integrating vehicle range, smart charging infrastructure, and battery electric vehicles into an econometric count framework utilizing countrywide data-driven insights.

Results

The findings demonstrate that technological advancements-specifically in vehicle range and the expansion of charging infrastructure-are vital solutions in driving battery electric vehicles acceptance. These advancements are essential for revolutionizing the transportation industry and contributing to the country's emissions reduction targets.

Discussion

However, this presents a dual challenge: balancing increased electricity demand while capitalizing on these technologies to meet net-zero goals. The study highlights critical policy implications, particularly the need to advance electric vehicle material technologies through the use of critical minerals including aluminum and lithium. By prioritizing these materials, producers can improve electric vehicles' efficiency and support the integration of renewable energy sources. The study concludes that incorporating renewable energy solutions, like solar-powered charging stations, is crucial for ensuring sustainable electricity. Policies encouraging public-private partnerships and investments in research on materials and smart charging technologies are crucial for reducing charging times and improving vehicle range. Additionally, fostering public-private collaborations to install smart charging infrastructure equipped with Internet-of-Things technology at parking slots can create a synergistic effect, significantly boosting electric vehicle adoption in China.
Predictors of mortality at 3 months in patients with skull base tumor resections in a low-income setting
Authors: Shiferaw Mestet Yibeltal , Baleh Abat Sahlu , Gizaw Abel , Teklemariam Tsegazeab Laeke , Aklilu Abenezer Tirsit , Awedew Atalel Fentahun , Anley Denekew Tenaw , Mekuria Bereket Hailu , Yesuf Ermias Fikiru , Yigzaw Mengistu Ayele , Molla Henok Teshome , Awano Mekides Muse , Mldie Alemu Adise , Abebe Endeshaw Chekole , Hailu Nebyou , Daniel Sura , Gebrewahd Dejen Teke
Published: December 2024

Objective

Globally, skull base tumors are among the most challenging tumors to treat and are known for their significant morbidity and mortality. Hence, this study aimed to identify robust associated factors that contribute to mortality of patients following surgical resection for a variety of skull base tumors at the 3-month follow-up period. This in turn helps devise an evidence-based meticulous treatment strategy and baseline input for quality improvement work.

Methodology

A retrospective cohort study of patients undergoing skull base tumor resection was conducted at two large-volume neurosurgery centers in Ethiopia. The categorical variables were expressed in frequencies and percentages. Normal distribution of continuous data was checked by histogram and the Shapiro–Wilk test. Median with interquartile range (IQR) was calculated for skewed data, while mean with standard deviation (SD) was used for normally distributed data. Odds ratio and adjusted odds ratio (AOR) were used to express the result of univariate and multivariate binary logistic analyses, respectively. A p-value <0.005 was considered statistically significant at 95% confidence interval (CI).

Result

The study involved 266 patients. Of this, women accounted for 63.5% of patients. The median age of patients was 37 (±IQR = 17) years while the median size of the tumor in this study was 4.9 (±IQR 1.5) cm. The mean duration of symptoms at time of presentation was 17.3 (±SD = 11.1) months. Meningioma, pituitary adenoma, and craniopharyngioma contributed to 68.4%, 19.2%, and 9% of the skull-based tumors, respectively. Mortality following skull base tumor resection was 21.1%. On multivariable binary logistic regression analysis, intraoperative iatrogenic vascular insult (AOR = 28.76, 95% CI: 6.12–135.08, p = 0.000), intraventricular hemorrhage (AOR = 6.32, 95% CI: 1.19–33.63, p = 0.031), hospital-associated infection (AOR = 6.96, 95% CI: 2.04–23.67, p = 0.002), and extubation time exceeding 24 h (AOR = 12.89, 95% CI: 4.89–40.34, p = 0.000) were statistically significant with 3-month mortality.

Conclusion

Mortality from skull base tumor resection remains high in our setting. Holistic pre-operative surgical planning, meticulous intraoperative execution of procedures, and post-operative dedicated follow-up of patients in a neurointensive care unit alongside quality improvement works on identified risks of mortality are strongly recommended to improve patient outcomes. The urgent need for setup improvement and further training of neurosurgeons is also underscored.
Case Report: A young man with frontal traumatic sinus pericranii
Authors: Zhang Zihao , Hao Qingpei , Luan Ruirui , Qin Guangbiao , Liu Ruen
Published: December 2024

Sinus pericranii is a rare venous anomaly characterized by abnormal communication between intracranial and subperiosteal veins, and reports of trauma-induced sinus pericranii are even rarer. Herein, we report a case of delayed-onset sinus pericranii resulting from a traumatic injury to the left side of the midline of the forehead sustained in early childhood. The anomaly was successfully resected via a coronal incision within the hairline, followed by meticulous bone wax sealing. In this paper, we aim to provide details on the diagnosis and surgical techniques of trauma-induced sinus pericranii, contributing valuable insights for the management of such rare condition.
Investigation of choline-binding protein of CbpD in the pathogenesis of Streptococcus suis type 2
Authors: Zhu Lexin , Li Mengqing , Yu Guijun , Zhan Dongbo , Zeng Wenzhen , Fu Nanyan , Jiang Xiaowu
Published: December 2024

Streptococcus suis serotype 2 (S. suis type 2, SS2) is one of the zoonotic pathogens known to induce meningitis, septicemia, and arthritis in both pigs and humans, resulting in public health concerns. CbpD, also termed CrfP, is one of the choline-binding proteins (CBPs) that was found as a murein hydrolase in SS2 and plays crucial roles in natural genetic transformation under the control of ComRS-ComX regulatory system by a previous study. Nonetheless, the possible functions of CbpD in virulence and pathogenesis in SS2 remain unclear. In this study, a cbpD gene mutant (ΔcbpD) with its complemental strain (cΔcbpD) was constructed and further used to examine the pathogenic roles of CbpD in SS2 infection. The results showed that the CbpD deficiency leads to increased bacterial chain elongation and aggregation with little impact on the growth capability of SS2. The ΔcbpD strain represented more vulnerable to a thermo, acid, or oxidative stress. Elevated adhesion to human epithelial HEp-2 cells, decreased invasion into bEND3.0 cells, and more easily phagocytosed by murine RAW264.7 macrophages of ΔcbpD were found. The virulence of cbpD mutant was attenuated in a mouse infection model. Enhanced susceptibility within mice blood and impaired ability to colonize organs with alleviated histopathological lesions were also demonstrated as compared with wild-type SS2. It is noteworthy that the discrepant expression of multiple virulence-associated factors including serine/threonine phosphorylase Stp, anti-phagocytosis factor of transglutaminase TGase and adhesin of chaperon DnaJ, were examined resulting from the deletion of cbpD. Overall, these findings provided evidence that the CbpD factor contributes to SS2 infection and is involved in bacterial adhesion, invasion, and anti-phagocytosis processes by modulating crucial virulence-associated factors expression.
Adolescents’ Wellbeing at School: What Helps and What Hinders From Feeling Safe and Satisfied?
Authors: Horanicova Simona , Husarova Daniela , Madarasova Geckova Andrea , Lackova Rebicova Miriama , Sokolova Lenka , deWinter Andrea F. , Reijneveld Sijmen
Published: December 2024

Objectives

The aim of this qualitative study was to identify the main factors that help and hinder adolescents’ wellbeing at school using their perspectives and experiences.

Methods

We used data from 45 adolescents in the first year of high school in Slovakia (mean age = 14.98; 22.2% boys). We obtained the data using 11 semi-structured group interviews conducted in 2020/2021. Participants were selected from three types of high school with regard to graduation system. Data was analysed using consensual qualitative research and thematic analysis.

Results

We identified three main themes of factors contributing to their wellbeing at school: 1. School (atmosphere and organisation of life at school, physical environment, threats and the ability of school to deal with issues); 2. Relationships (with peers and teachers, and teachers’ behaviour towards them); 3. Myself (own perceived obstacles and resilience resources).

Conclusion

The organisation of life at school, surroundings, threats and dealing with issues importantly affect adolescents’ wellbeing. Therefore, adjustment of physical environment and interpersonal competences of teachers, supporting of resilience resources of adolescents should be targets for interventions and prevention programmes at schools.
Balancing Safety and Comfort: A Novel Automatic Braking Control Method Using Seventh-Degree Polynomials
Authors: Lai Fei , Huang Chaoqun
Published: December 2024

This study reinterprets the rear-end collision avoidance problem as a trajectory planning challenge, introducing an automatic braking control method based on seventh-degree polynomials. This approach effectively balances vehicle safety and comfort. Unlike traditional automatic braking control methods, e.g., time-to-collision or safety distance models, our method incorporates multiple constraints at both the initiation and conclusion of braking. Consequently, it significantly improves the braking comfort while ensuring collision avoidance; specifically, the braking deceleration changes smoothly rather than abruptly, greatly reducing the vehicle’s jerk value. In accordance with the Euro NCAP testing standards, three car-to-car rear (CCR) test scenarios, such as car-to-car rear stationary (CCRs), car-to-car rear moving (CCRm) and car-to-car rear braking (CCRb), were established within the CarSim environment. The proposed algorithm was rigorously evaluated through integrated simulations performed in CarSim and MATLAB/Simulink, demonstrating its effectiveness.
Comparative Analysis of the Carbon Footprint Value Resulting from the Selected Mode of Transport, Based on the Example of Transporting Neodymium Magnets
Authors: Baron Rafał , Kowol Daniel , Matusiak Piotr , Friebe Paweł , Lutyński Marcin
Published: December 2024

The article presents a sensitivity analysis of the carbon footprint for different modes of transporting neodymium magnets over a selected route, in the context of their environmental impact and sustainable development. Neodymium magnets, widely used in modern technologies such as wind turbines, are essential for renewable energy sources, making the selection of environmentally optimal transportation crucial. The calculations included road, rail, inland waterway, and air transport, using available emission calculators, which allowed for an analysis using averaged emission indicators for each mode of transport. Additionally, a comparative analysis was conducted with the SimaPro program to verify the consistency and accuracy of the results. The findings indicated that rail transport, with access to low-emission infrastructure and a reduced carbon footprint per unit of mass, is the most efficient option for CO2 emissions reduction, whereas air transport, despite its speed, generates the highest emissions per ton of cargo, making it the least environmentally friendly alternative. A t-test analysis was also conducted to statistically validate the results for each transportation option.
Hyper-FDB-INFO Algorithm for Optimal Placement and Sizing of FACTS Devices in Wind Power-Integrated Optimal Power Flow Problem
Authors: Altun Bekir Emre , Kaymaz Enes , Dursun Mustafa , Guvenc Ugur
Published: December 2024

In this study, firstly, the balance between the exploration and exploitation capabilities of the weighted mean of vectors (INFO) algorithm was developed using the fitness–distance balance (FDB) method. Then, the FDB-INFO algorithm was developed with a hyper-heuristic method to create the beginning optimal population by using Linear Population Reduction Success History-based Adaptive Differential Evolution (LSHADE) and a novel Hyper-FDB-INFO algorithm was presented. Finally, the developed Hyper-FDB-INFO algorithm was applied to solve the optimal placement and sizing of FACTS devices for the optimal power flow (OPF) problem incorporating wind energy sources. Moreover, determining the placement and sizing of FACTS devices is an additional problem to minimize the total cost of generation and reducing the power losses of the power system. The experimental results showed that the Hyper-FDB-INFO algorithm is a more effective solver than the SHADE-SF, INFO, FDB-INFO and Hyper-INFO algorithms for wind power and FACTS devices integrating the OPF problem.
Role of Non-Binding T63 Alteration in IL-18 Binding
Authors: Peeyatu Chariya , Prompat Napat , Voravuthikunchai Supayang Piyawan , Roongsawang Niran , Sangkhathat Surasak , Khongkow Pasarat , Saetang Jirakrit , Tipmanee Varomyalin
Published: December 2024

Engineered interleukin-18 (IL-18) has attracted interest as a cytokine-based treatment. However, knowledge-based mutagenesis of IL-18 has been reported for only a few regions of the protein structures, including binding sites I and II. When coupled with the binding region mutant (E6K), the non-binding residue of IL-18, Thr63 (T63), has been shown to increase the flexibility of the binding loop. Nevertheless, the function of Thr63 in conformational regulation is still unknown. Using homology modeling, molecular dynamics simulation, and structural analysis, we investigated the effects of Thr63 alteration coupling with E6K on conformational change pattern, binding loop flexibility, and the hydrogen bond network. The results indicate that the 63rd residue was significantly associated with hydrogen-bond relaxation at the core β-barrel binding sites I and II Glu85-Ile100 loop. This result provided conformational and flexible effects to binding sites I and III by switching their binding loops and stabilizing the 63rd residue cavity. These findings may pave the way for the conceptualization of a new design for IL-18 proteins by modifying non-binding residues for structure-based drug development.
Polyphosphate Kinase from Burkholderia cenocepacia, One Enzyme Catalyzing a Two-Step Cascade Reaction to Synthesize ATP from AMP
Authors: Monterrey Dianelis T. , Azcona Leire , Revuelta Julia , Sánchez-Moreno Israel , García-Junceda Eduardo
Published: December 2024

This study characterizes a novel polyphosphate kinase from Burkholderia cenocepacia (BcPPK2-III), an enzyme with potential applications in ATP regeneration processes. Bioinformatic and structural analyses confirmed the presence of conserved motifs characteristic of PPK2 enzymes, including Walker A and B motifs, and the subclass-specific residue E137. Molecular docking simulations showed AMP had the highest binding affinity (−7.0 kcal/mol), followed by ADP (−6.5 kcal/mol), with ATP having the lowest affinity (−6.3 kcal/mol). It was overexpressed in Escherichia coli, after purification enzymatic activity assays revealed that BcPPK2-III needed divalent cations (Mg2⁺, Mn2⁺, Co2⁺) as cofactors to be active. Functional assays revealed its ability to synthesize ATP from AMP through a stepwise phosphorylation mechanism, forming ADP as an intermediate, achieving 70% ATP conversion (TTN 4354.7) after 24 h. Kinetic studies indicated cooperative behavior and substrate preference, with AMP phosphorylation to ADP being the most efficient step. The enzyme demonstrated high thermostability (T50 = 62 °C) and a broad pH stability range (pH 6.0–9.0), making it suitable for diverse biocatalytic applications. The study highlights BcPPK2-III as a robust and versatile candidate for cost-effective ATP regeneration, offering advantages in industrial processes requiring stoichiometric amounts of ATP.
Study of Mesostructured CeO2 Synthesis via Nanocasting Using SBA-15 as a Template: Influence of the Cerium Precursor
Authors: Moreno de la Calle Álvaro , Vizcaíno Arturo J. , Carrero Alicia , Calles José A. , Megía Pedro J.
Published: December 2024

Mesoporous materials with high surface area, large pore volume, and adjustable pore size are promising in the fields of adsorption and heterogeneous catalysis. In this work, ordered mesoporous ceria structures were successfully prepared via nanocasting using SBA-15 as a template, with Ce(NO3)3·6H2O or CeCl3·7H2O as ceria precursors. The materials were characterized before and after template removal. The CeO2 crystallite size in the CeO2/SBA-15 composites increases with successive impregnations until it reaches the pore size of the SBA-15. Upon removal of the SBA-15 template, the synthesized materials exhibit pore diameters corresponding to the wall thickness of the SBA-15, evidencing that the inverted structure was obtained. Mesoporous ceria exhibits increasingly ordered structure up to five successive impregnations with 1.3 mmolCe/gSBA-15. Using cerium chloride as a precursor, highly ordered structures were reached after only three impregnations. The feasibility of this synthesis in fewer steps (1, 3, and 5), employing the same amount of Ce precursor (6.7 mmolCe/gSBA-15), was also studied. Results show a higher ordering degree and oxygen mobility capacity at higher impregnation steps. The mesostructured ceria samples exhibit significantly higher oxygen mobility than commercial bulk ceria, along with high thermal stability, which highlights the usefulness of these structures.
Fast Degaussing Procedure for a Magnetically Shielded Room
Authors: Koss Peter A. , Voigt Jens , Rasser Ronja , Schnabel Allard
Published: December 2024

A demagnetization study was conducted on a magnetically shielded room (MSR) at Fraunhofer IPM, designed for applications such as magnetoencephalography (MEG) and material testing. With a composite of two layers of mu-metal and an intermediate aluminum layer, the MSR must provide a residual field under 5 nT for the successful operation of optically pumped magnetometers (OPMs). The degaussing process, employing six individual coils, reached the necessary residual magnetic field within the central 1 m3 volume in under four minutes. Due to the low-frequency shielding factor of 100, the obtained average residual field is shown to be limited by environmental residual field changes after degaussing and not by the degaussing procedure.
Separation of Magnesium and Lithium Ions Utilizing Layer-by-Layer Polyelectrolyte Modification of Polyacrylonitrile Hollow Fiber Porous Membranes
Authors: Koukoufilippou Danai , Liakos Ioannis L. , Pilatos George I. , Plakantonaki Niki , Banis Alexandros , Kanellopoulos Nikolaos K.
Published: December 2024

This study explores the layer-by-layer (LBL) modification of polyacrylonitrile (PAN) hollow fibers for effective Mg2+/Li+ separation. It employs an LBL method of surface modification using polyelectrolytes, specifically aiming to enhance ion selectivity and improve the efficiency of lithium extraction from brines or lithium battery wastes, which is critical for battery recycling and other industrial applications. The modification process involves coating the hydrolyzed PAN fibers with alternating layers of positively charged polyelectrolytes, such as poly(allylamine hydrochloride) (PAH), polyethyleneimine (PEI), or poly(diallyldimethylammonium chloride) (PDADMAC) and negatively charged polyelectrolytes, such as poly(styrene sulfonate) (PSS), to form polyelectrolyte multilayers (PEMs). This study evaluates the modified membranes in Mg2+ and Li+ salt solutions, demonstrating significant improvements in selectivity for Mg2+/Li+ separation. PAH was identified as the optimal positively charged polyelectrolyte. PAN hollow fibers modified with ten bilayers of PAH/PSS achieved rejection rates of 95.4% for Mg2+ ions and 34.8% for Li+ ions, and a permeance of 0.39 LMH/bar. This highlights the potential of LBL techniques for effectively addressing the challenges of ion separation across a variety of applications.
Structure Models of Metal Melts: A Review
Authors: Jiang Ailong , Li Yujuan , Wu Qihua , Qin Yusheng , Ma Shixuan , Zhang Yunji , Lin Xiaohang , Tian Xuelei
Published: December 2024

Nowadays, metallic materials are subject to increasingly high performance requirements, particularly in the context of energy efficiency and environmental sustainability, etc. Researchers typically target properties such as enhanced strength, hardness, and reduced weight, as well as superior physical and chemical characteristics, including electrochemical activity and catalytic efficiency. The structure of metal melts is essential for the design and synthesis of advanced metallic materials. Studies using high-temperature liquid X-ray diffraction (HTXRD) have established a broad consensus that short and medium range ordering exists within metallic melts. However, the high-temperature and liquid conditions during experiments obscure the fundamental physical characteristics, leading to ongoing discussions. Developing simplified models is a typical approach to deal with the complex systems, facilitating a clearer and more direct understanding of the underlying physical images. Here, different physical models of metal melts will be reviewed, starting with transient models, then following with thermodynamic statistical model. The physical image and applications of the models will be carefully discussed.
Heterogeneous Microstructure and Tensile Properties of Fe50Mn30Co10Cr10 Metastable High-Entropy Alloy
Authors: Sun Xiuying , Zhou Wei , Li Zhanjiang , Hong Chunfu , Chang Fa , Tian Jun , Dai Pinqiang
Published: December 2024

Face-centered cubic (FCC)-structured high-entropy alloys (HEAs) are facing a major challenge due to a trade-off between strength and ductility. In this paper, we systematically investigated the microstructural evolution and tensile properties of metastable dual-phase (DP) FeMnCoCr HEAs via cold rolling and partial recrystallized annealing, which resulted in a heterogeneous microstructure, and by inducing strengthening and strain-hardening through heterogeneous deformation-induced (HDI) strategies. The results show that the alloy was annealed at 600 °C for 10 min, exhibiting a good combination of strength and ductility. A higher alloy strength was obtained via HDI strengthening, while FCC → HCP phase transformation, deformation twins, and HDI strain-hardening contributed to the excellent ductility. The results provide a viable method for the design of subsequent alloys.
Microstructure Optimization of Thermoelectric τ1-Al2Fe3Si3 via Graded Temperature Heat Treatments
Authors: Yurishima Ryuta , Takagiwa Yoshiki , Ikeda Ayako , Ikeda Teruyuki
Published: December 2024

To investigate the relationship between microstructure, chemical composition, and thermoelectric properties, we have applied graded temperature heat treatments to recently developed τ1-Al2Fe3Si3-based thermoelectric (FAST) materials formed by a peritectic reaction. We investigated microstructures, chemical compositions, and Seebeck coefficients as continuous functions of heat treatment temperature. The τ1 phase can become p- and n-type semiconductors without doping by changing the Al/Si ratio. The Seebeck coefficient was maximized, exceeding |S| > 140 μVK−1 for both p- and n-type materials, by heat treatment at 1173 K for 24 h through microstructural optimization. These results show that combining the graded temperature heat treatments and spatial mapping measurements of thermoelectric properties gives effective routes to determine the suitable heat treatment temperature for materials with multiphase microstructure.
Unveiling the Effect of Ti Micro-Alloying on the Microstructure and Corrosion Resistance of the GH3536 Alloy Processed by Laser Metal Deposition in a Simulated Environment for PEMFCs
Authors: Xu Bing , Li Bo , Zhang Jie , Tong Jianping , Liu Yi
Published: December 2024

This article addresses the knowledge gap regarding the effect of Ti addition on the microstructure and corrosion behavior of the LMD-processed GH3536 alloy in a simulated solution of proton exchange membrane fuel cells (PEMFCs). The microstructural evolution, corrosion resistance, and passive film characteristics of LMD-processed GH3536 alloy with varying Ti contents were characterized through a variety of techniques, including scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), electron backscatter diffraction (EBSD), X-ray photoelectron spectroscopy (XPS), and a series of electrochemical measurements. The results indicate that the corrosion resistance of the LMD-processed GH3536 alloy significantly improves with increasing Ti content. However, when the Ti content exceeds 0.2 wt.%, the beneficial effect on corrosion resistance is weakened. Two primary mechanisms explain the enhanced corrosion resistance, involving the heterogeneous nucleation of Ti-modified Al2O3 and Ti solute segregation, which promotes grain refinement. In addition, grain refinement can provide more active sites for the formation of compact passive films, thereby improving corrosion resistance of the GH3536 alloy.
4D Printing Self-Sensing and Load-Carrying Smart Components
Authors: Qin Yi , Qiao Jianxin , Chi Shuai , Tian Huichun , Zhang Zexu , Liu He
Published: December 2024

In the past decade, 4D printing has received attention in the aerospace, automotive, robotics, and biomedical fields due to its lightweight structure and high productivity. Combining stimulus-responsive materials with 3D printing technology, which enables controllable changes in shape and mechanical properties, is a new technology for building smart bearing structures. A multilayer smart truss structural component with self-sensing function is designed, and an internal stress calibration strategy is established to better adapt to asymmetric loads. A material system consisting of continuous carbon fibers and polylactic acid was constructed, and an isosceles trapezoidal structure was chosen as the basic configuration of the smart component. The self-inductive properties are described by analyzing the relationship between the pressure applied to the specimen and the change in the specimen’s own resistance. Load-carrying capacity is realized by electrically heating the continuous carbon fibers in the component. Thermal deformation calibrates internal stress and enhances the load-carrying ability of the component over 50%. The experimental results demonstrate that the truss structure designed in this paper has strong self-induction, self-driving ability, and asymmetric load adaptation ability at the same time. This verifies that the 4D-printed smart component can be used as a load-carrying element, which broadens the application scope of smart components.
Influence of Selected Factors of Vibratory Work Hardening Machining on the Properties of CuZn30 Brass
Authors: Bańkowski Damian , Kiljan Anna , Hlaváčová Irena M. , Młynarczyk Piotr
Published: December 2024

The purpose of this study was to determine the effect of selected vibratory strengthening machining factors on the properties of CuZn30 brass. Vibratory strengthening machining was carried out using metal media dedicated to polishing processes, which also contributed to strengthening the treated surfaces. The test samples were cut with an abrasive water jet and recrystallized to obtain a soft microstructure. An orthogonal, two-factor five-level plan was used for the study. The effect of vibration frequency and vibratory machining time on selected changes in parameters of the geometric structure of the surface and hardness of the surface layer was determined using Statistica software version 10 (64-bit). Higher vibration frequencies for vibratory machining increased the hardness of machined surfaces by as much as 50 HV0.02. The arithmetic mean deviation of the height of surface irregularities from the reference plane, Sa, decreases with increasing the time of vibratory machining. A value of Sa = 0.168 µm was obtained after 87 min of consolidation, compared to an initial surface of Sa = 0.65 µm.
Graphene Quantum Dots from Agricultural Wastes: Green Synthesis and Advanced Applications for Energy Storage
Authors: Atanasio Pierfrancesco , Zampiva Rubia Y. S. , Buccini Luca , Di Conzo Corrado , Proietti Anacleto , Mura Francesco , Aurora Annalisa , Marrani Andrea G. , Passeri Daniele , Rossi Marco , Pasquali Mauro , Scaramuzzo Francesca A.
Published: December 2024

Carbon nanostructures are highly promising materials for applications in a variety of different fields. Besides their interesting performances, the possibility to synthesize them from biowaste makes them an eco-friendly resource widely exploitable within a circular economy context. The present work deals with the green, one-pot synthesis of graphene quantum dots (GQDs) from carbon aerogels (CAs) derived from rice husk (RH). After having obtained CAs upon purification of RH, followed by gelification and carbonization of the resulting cellulose, the one-pot solventless production of GQDs was obtained by ball milling. This method determined the formation of crystalline nanostructures with a diameter of around 20 nm, which were analyzed via scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction, and Raman spectroscopy to obtain a full morphological and structural characterization. GQDs were used as electrode materials for supercapacitors and Li-ion batteries, showing the ability to both accumulate charges over the surface and intercalate lithium-ions. The reported results are a proof of principle of the possibility of exploiting GQDs as support material for the development of advanced systems for energy storage.
Power Production and Degradation of Pesticide Wastewater Through Microbial Fuel Cells with the Modified Activated Carbon Air Cathode by Hollow-Carbon and Carbon-Encapsulated Structures
Authors: Zhang Xueli , Jia Linhui , Liu Yu , Wang Ziqi , Qin Jumiao , Wang Qiuhong , Zhao Xiao , Zhong Ming , Lang Jianfeng , Xu Guangri , Wu Yanbing , Cui Chengxing
Published: December 2024

Microbial fuel cell (MFC) can degrade pesticide wastewater and recovery energy simultaneously, and the activated carbon (AC) air cathode has great prospects for practical application. However, insufficient active sites and the limitation of multi-step electron transfer for oxygen reduction reaction (ORR) requires that AC should be modified by highly efficient electrocatalysts. Herein, busing the confinement effect of carbon-encapsulated metal and hollow carbon, we designed a unique ORR catalyst of Fe-Fe3O4-NC through utilizing the 2D leaf-like nanoplates of Zn-ZIF-L to load Prussian blue (PB) particles. The volatilization of low-boiled Zn and the catalysis of iron compounds led to the formation of confined walls of hollow carbon shell and carbon-encapsulated Fe/Fe3O4 particles on N-doped carbon substrate. Multivalent iron, a large surface area (368.11 m2·g−1), N doping, a heterojunction interface, and the confinement effect provided all the Fe-Fe3O4-NC-modified AC air cathodes with excellent ORR activity. The optimal samples of AC-Fe-Fe3O4-NC-3 achieved a peak power density of 1213.8 mW·m−2, demonstrating a substantial 82.8% increase over that of the bare AC. Furthermore, its efficiency in glyphosate removal reached 80.1%, surpassing the 23.2% of the bare AC. This study offers new ideas in constructing composite confined structures and the as-designed Fe-Fe3O4-NC is a promising modification candidate for the commercial adoption of AC air cathodes.
A Concise Review on Porous Adsorbents for Benzene and Other Volatile Organic Compounds
Authors: Choma Jerzy , Szczęśniak Barbara , Kapusta Adam , Jaroniec Mietek
Published: December 2024

Emissions of volatile organic compounds (VOCs) such as benzene, toluene, xylene, styrene, hexane, tetrachloroethylene, acetone, acetaldehyde, formaldehyde, isopropanol, etc., increase dramatically with accelerated industrialization and economic growth. Most VOCs cause serious environmental pollution and threaten human health due to their toxic and carcinogenic nature. Adsorption on porous materials is considered one of the most promising technologies for VOC removal due to its cost-effectiveness, operational flexibility, and low energy consumption. This review aims to provide a comprehensive understanding of VOC adsorption on various porous adsorbents and indicate future research directions in this field. It is focused on (i) the molecular characterization of structures, polarity, and boiling points of VOCs, (ii) the adsorption mechanisms and adsorption interactions in the physical, chemical, and competitive adsorption of VOCs on adsorbents, and (iii) the favorable characteristics of materials for VOCs adsorption. Porous adsorbents that would play an important role in the removal of benzene and other VOCs are presented in detail, including carbon-based materials (activated carbons, active carbon fibers, ordered mesoporous carbons, and graphene-based materials), metal-organic frameworks, covalent organic frameworks, zeolites, and siliceous adsorbents. Finally, the challenges and prospects related to the removal of VOCs via adsorption are pointed out.
Cyclobrachycoumarin from Gerbera piloselloides Inhibits Colorectal Cancer In Vitro and In Vivo
Authors: Fan Limei , Ye Xiansheng , Fang Qian , Li Xiaoxuan , Wang Haiping , Sun Binlian , Shu Xiji , Hou Xiaoying , Liu Yuchen
Published: December 2024

Gerbera piloselloides, a plant in the Asteraceae family, is a traditional Chinese medicinal herb known for its unique therapeutic properties, including reported anti-tumor and antioxidant effects. Recent studies suggest that the main constitute of G. piloselloides, coumarins, may have potential anti-tumor activity. Recent research suggests that coumarins, the active compounds in G. piloselloides, may hold potential anti-tumor activity. However, the pharmacodynamic constituents remain unidentified. This study aims to isolate and characterize the bioactive compounds of G. piloselloides and to assess its anti-tumor effects. Initially, seven compounds, including coumarins, a ketone, and a furanolide, were isolated and identified from G. piloselloides by semi-preparative high-performance liquid chromatography (HPLC) and nuclear magnetic resonance (NMR) analysis. The anti-tumor effects of these compounds were evaluated across four different cancer cell lines. Among them, the compound cyclobrachycoumarin showed a significant inhibitory effect on colorectal cancer (CRC) cell proliferation and was selected for further investigation. Cyclobrachycoumarin was found to induce CRC cell apoptosis and cell cycle arrest in a dose-dependent manner. This treatment also led to increased levels of ROS and cleaved PARP, along with decreased expressions of survivin, cyclin D1, and CDK1. In vivo studies further demonstrated that cyclobrachycoumarin effectively reduced tumor growth in HT-29 xenograft models by promoting apoptosis and cell cycle arrest, with a favorable tolerability profile. In summary, this study suggests that cyclobrachycoumarin may be a promising candidate for safe and effective CRC therapy.
Changes in Ibuprofen Toxicity and Degradation in Response to Immobilization of Bacillus thuringiensis B1(2015b)
Authors: Marchlewicz Ariel , Dzionek Anna , Wojcieszyńska Danuta , Borgulat Jacek , Jałowiecki Łukasz , Guzik Urszula
Published: December 2024

Ibuprofen is one of the most commonly used anti-inflammatory drugs by humans, resulting in its appearance in the environment, which can negatively affect organisms living in it. The studies undertaken have shown that the immobilized Bacillus thuringiensis B1(2015b) strain can decompose this drug at a rate of qmax = 0.36 mg/L*h, with a Ks constant of 0.95 mg/L for this process. An analysis of the effect of ibuprofen on the metabolic profile of the immobilized strain B1(2015b) showed an increase in the consumption of carbon, nitrogen, phosphorus, and sulfur compounds by this strain compared to the free strain. Studies on the toxicity of ibuprofen against the B1(2015b) strain indicated a small protective effect of the carrier, manifested by a slightly higher EC50 value = 1190 mg/L (for the free strain EC50 = 1175 mg/L). A toxicity analysis of intermedia formed during ibuprofen degradation indicated that the increase in toxicity is positively correlated with the degree of hydroxylation of ibuprofen metabolites. A toxicity analysis of the post-culture fluid obtained after ibuprofen degradation by the immobilized and free strain indicated that the products formed due to this process are completely safe.
Enhancing Permanence of Corrosion Inhibitors Within Acrylic Protective Coatings for Outdoor Bronze Using Green Nanocontainers
Authors: Pellis Giulia , Caldera Fabrizio , Trotta Francesco , Biazioli de Oliveira Thais , Rizzi Paola , Poli Tommaso , Scalarone Dominique
Published: December 2024

Outdoor bronze statues are constantly exposed to weather conditions and reactive compounds in the atmosphere that can interact with their surfaces. To avoid these interactions, a commonly used method is the application of coatings with corrosion inhibitors. However, a significant limitation of these inhibitors is their gradual loss over time. In this study, we aimed to improve the durability of 5-ethyl-1,3,4-thiadiazol-2-amine (AEDTA), the inhibitor chosen to formulate new acrylic coatings for outdoor bronzes. Methyl-β-cyclodextrin (Me-β-CD) was selected to host the inhibitor due to the capability of cyclodextrins to form complexes incorporating small organic molecules. The complexes of Me-β-CD and AEDTA were prepared and the inclusion of AEDTA was proved by Fourier-transform infrared spectroscopy, X-ray diffraction and nuclear magnetic resonance spectroscopy. Then, acrylic coatings were prepared at different concentrations of the Me-β-CD/AEDTA system. They were thermally aged and monitored every 24 h. To evaluate the volatilization of the corrosion inhibitor, solid phase microextraction-gas chromatography/mass spectrometry (SPME-GC/MS) and thermal desorption-GC/MS (TD-GC/MS) analyses were performed during the first 72 h. The results were compared to those of pure AEDTA films and Incralac®. The outcomes showed that Me-β-CD/AEDTA complexes are promising candidates for developing coatings with improved stability and longer retention of AEDTA.
Effect of Pyrolysis Temperature on the Carbon Sequestration Capacity of Spent Mushroom Substrate Biochar in the Presence of Mineral Iron
Authors: Liu Bin , Xing Zebing , Xue Yuxin , Zhang Ji , Zhai Junlin
Published: December 2024

The preparation of biochar typically involves the pyrolysis of waste organic biomass. Iron-rich magnetic biochar not only inherits the characteristics of high specific surface area and porous structure from biochar but also possesses significant advantages in easy separation and recovery, which has shown great application potential in various fields such as soil improvement and water resource remediation. This study aims to explore the influence of mineral iron on the carbon sequestration capability of biochar during the pyrolysis process. Experiments were conducted by using spent mushroom substrates as raw materials to prepare biochar at different temperature intervals (300 to 600 °C). The addition of exogenous iron has been found to significantly enhance the carbon retention rate (12.2–44.5%) of biochar across various pyrolysis temperatures and, notably, improves the carbon stability of biochar at 300 °C, 400 °C, and 600 °C. Through the analysis of thermogravimetric mass spectrometry (TG-MS) and X-ray photoelectron spectroscopy (XPS), we discovered that iron catalyzes the thermochemical reactions and inhibits the release of organic small molecules (C2-C5) through both physical blocking (FexOx) and chemical bonding (C=O and O-C=O). The results of Raman spectroscopy and infrared spectroscopy analyses indicate that the addition of iron significantly promotes the graphitization process of carbon and enhances the thermal stability of biochar within the temperature range of 300 to 500 °C. When exploring the retention and stability of carbon during pyrolysis, it was found that under the conditions of 600 °C and the presence of iron, the maximum carbon sequestration rate of biochar can reach 60.6%. Overall, this study highlights the critical role of iron and pyrolysis temperature in enhancing the carbon sequestration capacity of biochar.
Advancements in Solid–Liquid Nanogenerators: A Comprehensive Review and Future Prospects
Authors: Dai Kejie , Wang Yan , Li Baozeng , Li Pengfei , Wang Xueqing , Gao Lingxiao
Published: December 2024

In recent years, the advent of the smart era has confronted a novel “energy crisis”—the challenge of distributed energy provision, necessitating an imperative for clean energy development. Encompassing 71% of the Earth’s surface, water stands as the predominant conduit for energy transfer on our planet, effectively harnessing a fraction thereof to fulfill global energy demands. Modern hydropower technology primarily harnesses concentrated low-entropy water energy. However, the majority of natural water energy is widely dispersed in the environment as high-entropy distributed water energy, encompassing raindrop energy, stream energy, wave energy, evaporation energy, and other small-scale forms of water energy. While these energies are readily available, their collection poses significant challenges. Consequently, researchers initiated investigations into high-entropy water energy harvesting technology based on the electrodynamic effect, triboelectric effect, water volt effect, and other related phenomena. The present paper provides a comprehensive review of high-entropy water energy harvesting technologies, encompassing their underlying mechanisms, optimization strategies, and diverse applications. The current bottlenecks of these technologies are comprehensively analyzed, and their future development direction is prospectively discussed, thereby providing valuable guidance for future research on high-entropy water energy collection technology.