The 2023 MDPI Annual Report has
been released!
 
12 pages, 905 KiB  
Article
Comparative Evaluation of Dental Enamel Microhardness Following Various Methods of Interproximal Reduction: A Vickers Hardness Tester Investigation
by Dan-Cosmin Serbanoiu, Aurel-Claudiu Vartolomei, Dana-Valentina Ghiga, Silvia Izabella Pop, Irinel Panainte, Marioara Moldovan, Codruta Sarosi, Ioan Petean, Marie-Jose Boileau and Mariana Pacurar
Biomedicines 2024, 12(5), 1132; https://doi.org/10.3390/biomedicines12051132 (registering DOI) - 20 May 2024
Abstract
Interproximal enamel reduction, also known as stripping, is a common orthodontic procedure that reduces the mesiodistal diameter of teeth, allowing for a balance of available space in dental arches. The aim of this study was to assess the enamel surface microhardness resulting from [...] Read more.
Interproximal enamel reduction, also known as stripping, is a common orthodontic procedure that reduces the mesiodistal diameter of teeth, allowing for a balance of available space in dental arches. The aim of this study was to assess the enamel surface microhardness resulting from the application of currently available methods for interproximal reduction. Forty-two extracted human permanent teeth were divided into six different groups, each subjected to a therapeutic stripping procedure using various methods (i.e., diamond burs, abrasive strips of 90 μm, 60 μm, 40 μm, and 15 μm, and abrasive discs). Stripping was performed by a single individual in accordance with the manufacturers’ recommendations for the various systems used. One of the proximal faces of the tooth underwent IPR, while the other side remained untreated for control. The hardness of the enamel surface was measured using a Vickers hardness tester. The control group achieved the hardest enamel surface (354.4 ± 41.02 HV1), while the lowest was observed for enamel surfaces treated with 90 µm abrasive strips (213.7 ± 118.6). The only statistically significant difference was identified in comparisons between the values measured for the control group and those obtained after stripping with diamond burs (p = 0.0159). Enamel microhardness varied depending on the stripping instrument used, but no statistically significant differences were found (p > 0.05). Optimal microhardness values, close to those of healthy enamel, were achieved after mechanical treatment with 15 µm abrasive strips and abrasive discs. Dental stripping is a safe therapeutic procedure that has a relatively minor influence on the microhardness of surface enamel. Full article
(This article belongs to the Section Molecular and Translational Medicine)
Show Figures

Figure 1

34 pages, 1771 KiB  
Review
A Review on the Effects of Waste Textile Polymer Fiber on Concrete Strength: Exploring the Key Parameters
by Soorya Sasi, Paul Joseph, Robert Haigh, Malindu Sandanayake, Zora Vrcelj and Ehsan Yaghoubi
Buildings 2024, 14(5), 1486; https://doi.org/10.3390/buildings14051486 (registering DOI) - 20 May 2024
Abstract
The construction industry is one of the largest users of natural resources and can, thus, lead to significant environmental issues. Therefore, there is elevated interest worldwide in developing sustainable construction materials and techniques that can reduce these associated environmental impacts. In this context, [...] Read more.
The construction industry is one of the largest users of natural resources and can, thus, lead to significant environmental issues. Therefore, there is elevated interest worldwide in developing sustainable construction materials and techniques that can reduce these associated environmental impacts. In this context, one substantial area of focus is the incorporation of textile waste in construction materials, such as concrete. Textile waste is generated in large quantities from the production stage through to the consumption and end-of-life disposal periods. Hence, it is prudent to devise effective ways of recycling this waste, which can, in turn, reduce the environmental implications of textile production and cut down the quantity of waste sent to landfills. Furthermore, fibers obtained from recycled textile waste can be used to reinforce concrete, thus replacing the need for synthetic fibers. This review focuses on the use and effects of incorporating polymer fibers from recycled textile waste in concrete and the use of textile polymer fiber in the construction of various structures, and challenges in the use of recycled fibers in concrete and the parameters affecting the resultant strength of concrete structures, such as stress transfer, crack control, bond strength, and spalling, etc., are discussed. Full article
(This article belongs to the Special Issue Smart and Sustainable Infrastructure: Theory and Practice)
Show Figures

Figure 1

18 pages, 3330 KiB  
Article
Cross-Regional Crop Classification Based on Sentinel-2
by Jie He, Wenzhi Zeng, Chang Ao, Weimin Xing, Thomas Gaiser and Amit Kumar Srivastava
Agronomy 2024, 14(5), 1084; https://doi.org/10.3390/agronomy14051084 (registering DOI) - 20 May 2024
Abstract
Accurate crop classification is of vital importance for agricultural water management. Most researchers have achieved crop classification by model optimization in the same temporal and regional domain by adjusting the value of input features. This study aims to improve the accuracy of crop [...] Read more.
Accurate crop classification is of vital importance for agricultural water management. Most researchers have achieved crop classification by model optimization in the same temporal and regional domain by adjusting the value of input features. This study aims to improve the accuracy of crop classification across temporal and spatial domains. Sentinel-2 satellite imagery is employed for crop classification training and prediction in selected farming areas of Heilongjiang Province by calculating vegetation indices and constructing sequential input feature datasets. The HUNTS filtering method was used to mitigate the influence of cloud cover, which increased the stability and completeness of the input feature data across different years. To address the issue of shifts in the input feature values during cross-scale classification, this study proposes the hypothesis testing distribution method (HTDM). This method balances the distribution of input feature values in the test set even without knowing the crop distribution, thereby enhancing the accuracy of the classification test set. The results indicate that the HTDM significantly improves prediction accuracy in cases of substantial image quality variance. In 2022, the recognition accuracy for crop types at all farms processed by the HTDM was above 87%, showcasing the strong robustness of the HTDM. Full article
(This article belongs to the Section Precision and Digital Agriculture)
Show Figures

Figure 1

16 pages, 3266 KiB  
Article
Wear Resistance Behavior of Low-, Mid-, and High-Phosphorus Electroless Ni-P Coatings Heat-Treated in the Air Environment
by Dhani Ram Dhakal, Young Uk Han, Byung Geon Lee, Tae Ho Kim, Gi Bum Jang and Sung Youl Cho
Coatings 2024, 14(5), 648; https://doi.org/10.3390/coatings14050648 (registering DOI) - 20 May 2024
Abstract
The high-temperature heat treatment of electroless nickel–phosphorus (Ni-P) coatings in an air environment, and its consequences have scarcely been investigated. This work investigated tribological characteristics of the high-temperature, heat-treated, electroless Ni-P coatings on steel substrates with low-, mid-, and high-phosphorus content for which [...] Read more.
The high-temperature heat treatment of electroless nickel–phosphorus (Ni-P) coatings in an air environment, and its consequences have scarcely been investigated. This work investigated tribological characteristics of the high-temperature, heat-treated, electroless Ni-P coatings on steel substrates with low-, mid-, and high-phosphorus content for which the average phosphorus content was 2.4 wt.%, 7.1 wt.%, and 10.3 wt.%, respectively. X-ray fluorescence and energy dispersive spectroscopy were implemented to determine the phosphorus content of the coatings. The oxidation of Ni and the formation of the NiO layer on the coating surface was confirmed by the X-ray diffraction technique. A reciprocating sliding method on a ball-on-flat system was utilized to evaluate the coating’s friction and wear behavior. Among the coatings with varying phosphorus content, a high hardness of 1086 HV was found for high-phosphorus coating when heat-treated at 400 °C in an air environment, and that was decreased to 691 HV when heat-treated at 650 °C. The oxidation of nickel in the electroless Ni-P coating occurred when heat-treated at 400 °C in an air environment, and this phenomenon was increased more when the temperature was increased to 650 °C. The characteristics of the NiO layer that formed on the surface of the heat-treated electroless Ni-P coating were influenced by the concentration of phosphorus, which caused different colors of NiO to be seen on the Ni-P coating surface. A greenish black NiO layer on the low-phosphorus and black NiO layer on the mid- and high-phosphorus Ni-P coating was developed during heat treatment at 650 °C in an air atmosphere. The adhesion and tribological characteristics of the Ni-P coatings were affected by the NiO layer developed on the heat-treated Ni-P coating surfaces. The Ni-P coatings with mid- and high-phosphorus content showed enhanced wear-resistance characteristics when they underwent heat treatment in an air atmosphere at the high temperature of 650 °C. The wear volume obtained for as-plated mid-phosphorus and high-phosphorus Ni-P coatings was 0.111 mm3 and 0.128 mm3, respectively, and that was reduced to 0.031 mm3 and 0.051 mm3, respectively, after the high-temperature heat treatment. Full article
(This article belongs to the Special Issue Advanced Wear-Resistant Materials and Coatings)
Show Figures

Figure 1

15 pages, 3017 KiB  
Article
Examining the Effects of Altitude on Workload Demands in Professional Basketball Players during the Preseason Phase
by Sergio J. Ibáñez, Carlos D. Gómez-Carmona, Sergio González-Espinosa and David Mancha-Triguero
Sensors 2024, 24(10), 3245; https://doi.org/10.3390/s24103245 (registering DOI) - 20 May 2024
Abstract
Basketball involves frequent high-intensity movements requiring optimal aerobic power. Altitude training can enhance physiological adaptations, but research examining its effects in basketball is limited. This study aimed to characterize the internal/external workload of professional basketball players during preseason and evaluate the effects of [...] Read more.
Basketball involves frequent high-intensity movements requiring optimal aerobic power. Altitude training can enhance physiological adaptations, but research examining its effects in basketball is limited. This study aimed to characterize the internal/external workload of professional basketball players during preseason and evaluate the effects of altitude and playing position. Twelve top-tier professional male basketball players (Liga Endesa, ACB; guards: n = 3, forwards: n = 5, and centers: n = 4) participated in a crossover study design composed of two training camps with nine sessions over 6 days under two different conditions: high altitude (2320 m) and sea level (10 m). Internal loads (heart rate, %HRMAX) and external loads (total distances covered across speed thresholds, accelerations/decelerations, impacts, and jumps) were quantified via wearable tracking and heart rate telemetry. Repeated-measures MANOVA tested the altitude x playing position effects. Altitude increased the total distance (+10%), lower-speed running distances (+10–39%), accelerations/decelerations (+25–30%), average heart rate (+6%), time in higher-intensity HR zones (+23–63%), and jumps (+13%) across all positions (p < 0.05). Positional differences existed, with guards accruing more high-speed running and centers exhibiting greater cardiovascular demands (p < 0.05). In conclusion, a 6-day altitude block effectively overloads training, providing a stimulus to enhance fitness capacities when structured appropriately. Monitoring workloads and individualizing training by playing position are important when implementing altitude training, given the varied responses. Full article
Show Figures

Figure 1

18 pages, 1325 KiB  
Perspective
Molecular and Therapeutic Roles of Non-Coding RNAs in Oral Cancer—A Review
by Vidhya Rekha Umapathy, Prabhu Manickam Natarajan and Bhuminathan Swamikannu
Molecules 2024, 29(10), 2402; https://doi.org/10.3390/molecules29102402 (registering DOI) - 20 May 2024
Abstract
Oral cancer (OC) is among the most common malignancies in the world. Despite advances in therapy, the worst-case scenario for OC remains metastasis, with a 50% survival rate. Therefore, it is critical to comprehend the pathophysiology of the condition and to create diagnostic [...] Read more.
Oral cancer (OC) is among the most common malignancies in the world. Despite advances in therapy, the worst-case scenario for OC remains metastasis, with a 50% survival rate. Therefore, it is critical to comprehend the pathophysiology of the condition and to create diagnostic and treatment plans for OC. The development of high-throughput genome sequencing has revealed that over 90% of the human genome encodes non-coding transcripts, or transcripts that do not code for any proteins. This paper describes the function of these different kinds of non-coding RNAs (ncRNAs) in OC as well as their intriguing therapeutic potential. The onset and development of OC, as well as treatment resistance, are linked to dysregulated ncRNA expression. These ncRNAs’ potentially significant roles in diagnosis and prognosis have been suggested by their differing expression in blood or saliva. We have outlined every promising feature of ncRNAs in the treatment of OC in this study. Full article
(This article belongs to the Section Medicinal Chemistry)
Show Figures

Figure 1

29 pages, 1760 KiB  
Article
Statistical Mechanics Approaches for Studying Temperature and Rate Effects in Multistable Systems
by Andrea Cannizzo and Stefano Giordano
Symmetry 2024, 16(5), 632; https://doi.org/10.3390/sym16050632 (registering DOI) - 20 May 2024
Abstract
Systems with a multistable energy landscape are widespread in physics, biophysics, technology, and materials science. They are strongly influenced by thermal fluctuations and external mechanical actions that can be applied at different rates, moving the system from equilibrium to non-equilibrium regimes. In this [...] Read more.
Systems with a multistable energy landscape are widespread in physics, biophysics, technology, and materials science. They are strongly influenced by thermal fluctuations and external mechanical actions that can be applied at different rates, moving the system from equilibrium to non-equilibrium regimes. In this paper, we focus on a simple system involving a single breaking phenomenon to describe the various theoretical approaches used to study these problems. To begin with, we propose the exact solution at thermodynamic equilibrium based on the calculation of the partition function without approximations. We then introduce the technique of spin variables, which is able to simplify the treatment even for systems with a large number of coordinates. We then analyze the energy balance of the system to better understand its underlying physics. Finally, we introduce a technique based on transition state theory useful for studying the non-equilibrium dynamical regimes of these systems. This method is appropriate for the evaluation of rate effects and hysteresis loops. These approaches are developed for both the Helmholtz ensemble (prescribed extension) and the Gibbs ensemble (applied force) of statistical mechanics. The symmetry and duality of these two ensembles is discussed in depth. While these techniques are used here for a simple system with theoretical purposes, they can be applied to complex systems of interest for several physical, biophysical, and technological applications. Full article
(This article belongs to the Special Issue Feature Papers in Section "Engineering and Materials" 2024)
Show Figures

Figure 1

12 pages, 2650 KiB  
Article
Combined Aerobic Fermentation of Maricultural and Agricultural Solid Waste: Physicochemical Property and Bacterial Community Structure
by Yalikun Tudi, Lanlan Pan, Xinjian Du, Biyue Liu, Xiuchen Li, Fuying Zheng and Qian Zhang
Sustainability 2024, 16(10), 4306; https://doi.org/10.3390/su16104306 (registering DOI) - 20 May 2024
Abstract
The large-scale production of maricultural solid waste is not used effectively and has a significant impact on the environment. However, there is no report on the utilization of solid waste in mariculture of maricultural and agricultural solid waste. At present, aerobic composting is [...] Read more.
The large-scale production of maricultural solid waste is not used effectively and has a significant impact on the environment. However, there is no report on the utilization of solid waste in mariculture of maricultural and agricultural solid waste. At present, aerobic composting is a simple and feasible means of waste resource utilization, but it also seriously pollutes the environment. This paper studied the change of physical and chemical properties (T1: solid waste + straw, T2: solid waste + cow dung + straw, T3: solid waste + cow dung + straw + 5% biochar, T4: solid waste + chicken dung + cow dung + straw + 5% biochar) and microbial succession in the composting process (T4: solid waste + chicken dung + cow dung + straw + 5% biochar) and the effect of decomposed products on seed growth. The results showed that the mixed compost of various materials had a good regulating effect on the physical and chemical indexes, and the highest temperature could reach 69.4 °C. Biochar could extend the high temperature period by 1–2 days. The germination indexes of seeds treated with T1–T4 were 75%, 80%, 81%, and 94%, respectively. Through the change of the seed germination index, it could be seen that the bacterial community structure changed significantly during composting. The Chao 1 index and Shannon index showed that the bacterial abundance and diversity index increased and then decreased. The analysis of the bacterial community structure showed that Proteobacteria and Acinetobacter were the main bacteria in composting, and the relative abundance of Proteobacteria was 81.9% at the phyla level. Acinetobacter and Pseudoxanthomonas were the main bacteria in the process of composting. Acinetobacter was the dominant bacteria in the heating stage, with an abundance of 67.2%. Full article
(This article belongs to the Section Sustainable Chemical Engineering and Technology)
Show Figures

Figure 1

13 pages, 464 KiB  
Article
Improving the Yield of Genetic Diagnosis through Additional Genetic Panel Testing in Hereditary Ophthalmic Diseases
by Jin Gwack, Namsu Kim and Joonhong Park
Curr. Issues Mol. Biol. 2024, 46(5), 5010-5022; https://doi.org/10.3390/cimb46050300 (registering DOI) - 20 May 2024
Abstract
Numerous hereditary ophthalmic diseases display significant genetic diversity. Consequently, the utilization of gene panel sequencing allows a greater number of patients to receive a genetic diagnosis for their clinical manifestations. We investigated how to improve the yield of genetic diagnosis through additional gene [...] Read more.
Numerous hereditary ophthalmic diseases display significant genetic diversity. Consequently, the utilization of gene panel sequencing allows a greater number of patients to receive a genetic diagnosis for their clinical manifestations. We investigated how to improve the yield of genetic diagnosis through additional gene panel sequencing in hereditary ophthalmic diseases. A gene panel sequencing consisting of a customized hereditary retinopathy panel or hereditary retinitis pigmentosa (RP) panel was prescribed and referred to a CAP-accredited clinical laboratory. If no significant mutations associated with hereditary retinopathy and RP were detected in either panel, additional gene panel sequencing was requested for research use, utilizing the remaining panel. After additional gene panel sequencing, a total of 16 heterozygous or homozygous variants were identified in 15 different genes associated with hereditary ophthalmic diseases. Of 15 patients carrying any candidate variants, the clinical symptoms could be tentatively accounted for by genetic mutations in seven patients. However, in the remaining eight patients, given the in silico mutation predictive analysis, variant allele frequency in gnomAD, inheritance pattern, and genotype–phenotype correlation, fully elucidating the clinical manifestations with the identified rare variant was challenging. Our study highlights the utility of gene panel sequencing in achieving accurate diagnoses for hereditary ophthalmic diseases and enhancing the diagnostic yield through additional gene panel sequencing. Thus, gene panel sequencing can serve as a primary tool for the genetic diagnosis of hereditary ophthalmic diseases, even in cases where a single genetic cause is suspected. With a deeper comprehension of the genetic mechanisms underlying these diseases, it becomes feasible. Full article
(This article belongs to the Special Issue Complex Molecular Mechanism of Monogenic Diseases 2.0)
Show Figures

Figure 1

15 pages, 2828 KiB  
Article
Reduced Tolerogenic Program Death-Ligand 1-Expressing Conventional Type 1 Dendritic Cells Are Associated with Rapid Decline in Chronic Obstructive Pulmonary Disease
by Kuan-Yuan Chen, Wei-Lun Sun, Sheng-Ming Wu, Po-Hao Feng, Chiou-Feng Lin, Tzu-Tao Chen, Yueh-Hsun Lu, Shu-Chuan Ho, Yueh-Hsi Chen and Kang-Yun Lee
Cells 2024, 13(10), 878; https://doi.org/10.3390/cells13100878 (registering DOI) - 20 May 2024
Abstract
Background: Chronic obstructive pulmonary disease (COPD) is characterized, at least in part, by autoimmunity through amplified T helper 1 and 17 (Th1 and Th17) immune responses. The loss of immune tolerance controlled by programmed death-ligand 1 (PD-L1) may contribute to this. Objectives: We [...] Read more.
Background: Chronic obstructive pulmonary disease (COPD) is characterized, at least in part, by autoimmunity through amplified T helper 1 and 17 (Th1 and Th17) immune responses. The loss of immune tolerance controlled by programmed death-ligand 1 (PD-L1) may contribute to this. Objectives: We studied the tolerogenic role of PD-L1+ dendritic cells (DCs) and their subtypes in relation to specific T cell immunity and the clinical phenotypes of COPD. Methods: We used flow cytometry to analyze PD-L1 expression by the DCs and their subtypes in the peripheral blood mononuclear cells (PBMCs) from normal participants and those with COPD. T cell proliferation and the signature cytokines of T cell subtypes stimulated with elastin as autoantigens were measured using flow cytometry and enzyme-linked immunosorbent assays (ELISA), respectively. Measurement and main results: A total of 83 participants were enrolled (normal, n = 29; COPD, n = 54). A reduced PD-L1+ conventional dendritic cell 1 (cDC1) ratio in the PBMCs of the patients with COPD was shown (13.7 ± 13.7%, p = 0.03). The decrease in the PD-L1+ cDC1 ratio was associated with a rapid decline in COPD (p = 0.02) and correlated with the CD4+ T cells (r = −0.33, p = 0.02). This is supported by the NCBI GEO database accession number GSE56766, the researchers of which found that the gene expressions of PD-L1 and CD4, but not CD8 were negatively correlated from PBMC in COPD patients (r = −0.43, p = 0.002). Functionally, the PD-L1 blockade enhanced CD4+ T cell proliferation stimulated by CD3/elastin (31.2 ± 22.3%, p = 0.04) and interleukin (IL)-17A production stimulated by both CD3 (156.3 ± 54.7, p = 0.03) and CD3/elastin (148 ± 64.9, p = 0.03) from the normal PBMCs. The PD-L1 blockade failed to increase IL-17A production in the cDC1-depleted PBMCs. By contrast, there was no significant change in interferon (IFN)-γ, IL-4, or IL-10 after the PD-L1 blockade. Again, these findings were supported by the NCBI GEO database accession number GSE56766, the researchers of which found that only the expression of RORC, a master transcription factor driving the Th17 cells, was significantly negatively correlated to PD-L1 (r = −0.33, p = 0.02). Conclusions: Circulating PD-L1+ cDC1 was reduced in the patients with COPD, and the tolerogenic role was suppressed with susceptibility to self-antigens and linked to rapid decline caused by Th17-skewed chronic inflammation. Full article
(This article belongs to the Special Issue Dendritic Cells in Health and Disease)
Show Figures

Figure 1

17 pages, 2405 KiB  
Article
Pre-Clinical Assessment of SAR442257, a CD38/CD3xCD28 Trispecific T Cell Engager in Treatment of Relapsed/Refractory Multiple Myeloma
by Anna Luise Grab, Peter S. Kim, Lukas John, Kamlesh Bisht, Hongfang Wang, Anja Baumann, Helgi Van de Velde, Irene Sarkar, Debarati Shome, Philipp Reichert, Calin Manta, Stefanie Gryzik, Rogier M. Reijmers, Niels Weinhold and Marc S. Raab
Cells 2024, 13(10), 879; https://doi.org/10.3390/cells13100879 (registering DOI) - 20 May 2024
Abstract
Current treatment strategies for multiple myeloma (MM) are highly effective, but most patients develop relapsed/refractory disease (RRMM). The anti-CD38/CD3xCD28 trispecific antibody SAR442257 targets CD38 and CD28 on MM cells and co-stimulates CD3 and CD28 on T cells (TCs). We evaluated different key aspects [...] Read more.
Current treatment strategies for multiple myeloma (MM) are highly effective, but most patients develop relapsed/refractory disease (RRMM). The anti-CD38/CD3xCD28 trispecific antibody SAR442257 targets CD38 and CD28 on MM cells and co-stimulates CD3 and CD28 on T cells (TCs). We evaluated different key aspects such as MM cells and T cells avidity interaction, tumor killing, and biomarkers for drug potency in three distinct cohorts of RRMM patients. We found that a significantly higher proportion of RRMM patients (86%) exhibited aberrant co-expression of CD28 compared to newly diagnosed MM (NDMM) patients (19%). Furthermore, SAR442257 mediated significantly higher TC activation, resulting in enhanced MM killing compared to bispecific functional knockout controls for all relapse cohorts (Pearson’s r = 0.7). Finally, patients refractory to anti-CD38 therapy had higher levels of TGF-β (up to 20-fold) compared to other cohorts. This can limit the activity of SAR442257. Vactoserib, a TGF-β inhibitor, was able to mitigate this effect and restore sensitivity to SAR442257 in these experiments. In conclusion, SAR442257 has high potential for enhancing TC cytotoxicity by co-targeting CD38 and CD28 on MM and CD3/CD28 on T cells. Full article
(This article belongs to the Collection Cancer Stem Cells and Drug Resistance)
Show Figures

Figure 1

15 pages, 6240 KiB  
Article
Co-Producing an Ethnobotanical Garden to Support the Conservation of Indigenous Crop Diversity
by Pei-Hsin Hsu, Chih-Liang Chao and Gene-Sheng Tung
J. Zool. Bot. Gard. 2024, 5(2), 211-225; https://doi.org/10.3390/jzbg5020015 (registering DOI) - 20 May 2024
Abstract
Botanical gardens play a crucial role in documenting and sustaining traditional ecological knowledge (TEK) that were integral to the lives of Indigenous peoples. TEK has gained significant attention in discussions on sustainable development. Faced with threats to the maintenance and transfer of this [...] Read more.
Botanical gardens play a crucial role in documenting and sustaining traditional ecological knowledge (TEK) that were integral to the lives of Indigenous peoples. TEK has gained significant attention in discussions on sustainable development. Faced with threats to the maintenance and transfer of this knowledge, alternative approaches like community-based ethnobotanical gardens are emerging as effective tools for conservation. This paper details a research partnership that focused on storing and sharing the Bunun ethnic community’s TEK to conserve and promote plant and crop diversity. This collaboration further led to the co-development of an Indigenous ecological calendar detailing knowledge about crops, specifically beans. The ecological calendar emerged as an effective tool for supporting knowledge sharing, facilitating the communication of crop knowledge along with both common and scientific names. The Indigenous ecological calendar has also become a valuable tourism resource for guided tours, helping to build recognition of Indigenous knowledge, and making it accessible to future generations. Full article
18 pages, 8324 KiB  
Article
Optimization of Elbow Draft Tubes for Variable Speed Propeller Turbine
by Jiří Souček and Petr Nowak
Water 2024, 16(10), 1457; https://doi.org/10.3390/w16101457 (registering DOI) - 20 May 2024
Abstract
The design of the elbow draft tubes is challenging due to the complexity of the flow. The whole turbine unit’s power output strongly depends on the draft tube function, especially for the low-head turbines. The article presents a novel approach to optimizing elbow [...] Read more.
The design of the elbow draft tubes is challenging due to the complexity of the flow. The whole turbine unit’s power output strongly depends on the draft tube function, especially for the low-head turbines. The article presents a novel approach to optimizing elbow draft tubes for a variable-speed propeller turbine designed for low-head applications. First, the study addresses the specifics of the propeller variable speed turbine by comparing the classical Kaplan turbine. Then, the grid scaling test is conducted to evaluate the uncertainty of the pressure regeneration. Further, a new approach to parameterising the elbow draft tube geometry is introduced. The study employs ANSYS CFX 2021 R1 software for numerical simulation to optimise the elbow draft tube geometry in the CAESES environment. After the sensitivity test and deselecting the non-sensitive parameters, we perform multi-objective genetic algorithm (MOGA) optimization. The optimization process results in a Pareto front of optimised elbow draft tube shapes with the best pressure regeneration for different draft tube construction heights, enabling the selection of suitable candidates for various locations. Minimal difference in the performance of the selected elbow draft tube shapes with the simple straight draft tube confirms a high-quality draft tube optimization achievement. Full article
(This article belongs to the Section Water-Energy Nexus)
Show Figures

Figure 1

19 pages, 3133 KiB  
Article
The Impact of Granting of Forest Certificates on Farmers’ Income—Intermediation Effects Based on Forestland Lease
by Lishan Li, Meifang Liu, Yuchao Yang, Fangting Xie and Xiaojin Liu
Forests 2024, 15(5), 888; https://doi.org/10.3390/f15050888 (registering DOI) - 20 May 2024
Abstract
This study examines the impact of granting forest certificates on farmer income. Linear regression and mediating effect models were used to analyze repeated survey data of 505 households in 50 villages in Jiangxi Province in 2017 and 2018. We examined the impacts of [...] Read more.
This study examines the impact of granting forest certificates on farmer income. Linear regression and mediating effect models were used to analyze repeated survey data of 505 households in 50 villages in Jiangxi Province in 2017 and 2018. We examined the impacts of granting forest certificates on forestry income and the total income of rural households, taking into account forestland leases. We draw the following conclusions: first, granting forest certificates has a significant positive effect on total household income but not on forestry income. Second, farmers prefer forestland leasing in their behavior. Granting forest certificates can promote forestland lease out, but the effect on forestland lease in is not obvious. Third, granting forest certificates contributes to the increase in total household income through forestland lease out. Our analysis suggests that the government should increase the proportion of granted forest certificates and improve the policies related to the lease of forestland so as to realize an increase in farmer income. Full article
(This article belongs to the Section Forest Economics, Policy, and Social Science)
Show Figures

Figure 1

22 pages, 43250 KiB  
Article
Urban Texture Identification and Characteristic Analysis Based on Percolation Theory—A Case Study of the Second Ring Road Area in Wuhan City
by Shen Yang, Qingming Zhan, Kaili Zhang and Hurex Paryzat
Land 2024, 13(5), 717; https://doi.org/10.3390/land13050717 (registering DOI) - 20 May 2024
Abstract
The urban texture is the physical manifestation of the urban form’s evolution. In the rapid process of urbanization, protecting and reshaping the urban texture has become an essential means to sustain the overall form and vitality of cities. Previous studies in this field [...] Read more.
The urban texture is the physical manifestation of the urban form’s evolution. In the rapid process of urbanization, protecting and reshaping the urban texture has become an essential means to sustain the overall form and vitality of cities. Previous studies in this field have primarily relied on image analysis or typological methods, lacking a quantitative approach to identify and analyze the urban texture on a large scale. Moreover, the hierarchical structure and networked organization of the urban texture are gradually being elucidated and emphasized. This study takes a complex network perspective and applies percolation theory to identify and analyze the urban texture. The hierarchical evolutionary characteristics of the urban fabric and the underlying mechanisms driving the scale-dependent differences are analyzed, and the toughness of the urban texture is evaluated based on hierarchical connections. The research findings reveal the key scale in the cross-scale evolution of urban textures, with variations in scale dependence and hierarchical evolution characteristics among different types of urban texture. The traditional urban texture displays sensitivity to scale changes, maintaining its integrity and internal connectivity at small scales. On the other hand, the texture characteristics of modern and contemporary urban areas are only discernible at larger scales. The emergence of large-scale texture clusters at specific scale levels can be explained using multiple index systems. This study has reference significance for the preservation and renewal of the urban fabric in urban renewal processes. Full article
(This article belongs to the Special Issue Urban Morphology: A Perspective from Space)
Show Figures

Figure 1

17 pages, 2780 KiB  
Article
Reduction in the Input of Microplastics into the Aquatic Environment via Wastewater Treatment Plants in Germany
by Philipp Lau, Julia Stein, Luisa Reinhold, Matthias Barjenbruch, Tim Fuhrmann, Ingo Urban, Katrin Bauerfeld and Andrea Holte
Microplastics 2024, 3(2), 276-292; https://doi.org/10.3390/microplastics3020017 (registering DOI) - 20 May 2024
Abstract
Microplastic (MP) has emerged as a significant environmental challenge due to increased plastic production and its widespread presence in the environment. This study aimed to assess MP concentrations throughout the treatment process at nine wastewater treatment plants (WWTPs) in Germany, from influent to [...] Read more.
Microplastic (MP) has emerged as a significant environmental challenge due to increased plastic production and its widespread presence in the environment. This study aimed to assess MP concentrations throughout the treatment process at nine wastewater treatment plants (WWTPs) in Germany, from influent to effluent. A customized sampling technique was employed, followed by field and laboratory preparation and the quantification of polymers (PE, PP, PS, PMMA, and PET) using TED-GCMS. MP concentrations decreased progressively in the WWTPs, with influent concentrations ranging from 2.5 to 13.6 mg/L. Effluent concentrations in the conventional WWTPs ranged from 0.001 to 0.051 mg/L, while advanced treatment via filtration yielded concentrations below the limit of quantification at 0.005 mg/L. All tested of the WWTPs demonstrated an over 99% removal efficiency for microplastics. Despite effective retention by the WWTPs, a critical evaluation of the results is necessary. There is a need to optimize existing technologies and enhance the standardization of sampling, processing, and measurement methods, as well as intensify efforts towards creating preventive measures to reduce plastic emissions. Full article
(This article belongs to the Special Issue Microplastics in Aquatic Enviroments)
Show Figures

Figure 1

13 pages, 3388 KiB  
Article
Study on Nutrient Carrier of Mulch Based on Hydrogel @SiO2
by Dan Qin, Yujie Ma, Mei Wang and Zhihua Shan
Polymers 2024, 16(10), 1442; https://doi.org/10.3390/polym16101442 (registering DOI) - 20 May 2024
Abstract
Soil conservation is one of the best methods to improve soil fertility and enhance crop growth efficiency. Replacing plastic mulch with biomass is an environmentally friendly strategy. Innovative encapsulated soil granules (ESGs) were developed using PVA/PC film as the wall material and rural [...] Read more.
Soil conservation is one of the best methods to improve soil fertility and enhance crop growth efficiency. Replacing plastic mulch with biomass is an environmentally friendly strategy. Innovative encapsulated soil granules (ESGs) were developed using PVA/PC film as the wall material and rural soil as the core. The PVA/PC was synthesized using 60% protein polypeptide (PC) from leather waste scrap and 35% poly (vinyl alcohol) (PVA), which was optimized for water absorption expansion and water retention performance. The ESG-10 granulated with 10% PVA/PC exhibited good water absorption, moisture retention, and resistance to water solubility. As an auxiliary material for soil improvement, the amount of ESGs mixed with the topsoil at ratios of 0 g/m2, 200 g/m2, and 400 g/m2 was proportional to the soil insulation and moisture retention. In rapeseed cultivation, the experimental results indicated that the soil mulched with ESG-10 can maintain seedling vitality for a long time under low water content conditions. Full article
(This article belongs to the Section Smart and Functional Polymers)
Show Figures

Figure 1

19 pages, 3399 KiB  
Review
The Use of Waste Ceramic in Concrete: A Review
by Zahraa Jwaida, Anmar Dulaimi and Luís Filipe Almeida Bernardo
CivilEng 2024, 5(2), 482-500; https://doi.org/10.3390/civileng5020024 (registering DOI) - 20 May 2024
Abstract
Waste ceramic is produced from different sources and, if not reused, is often disposed of in landfills, contributing to the pressure on landfill capacity and potentially releasing toxins into the surrounding environment as ceramics break down over time. The waste can easily be [...] Read more.
Waste ceramic is produced from different sources and, if not reused, is often disposed of in landfills, contributing to the pressure on landfill capacity and potentially releasing toxins into the surrounding environment as ceramics break down over time. The waste can easily be crushed to the required sizes, which has interested many researchers. It has been used as a replacement for concrete constituents, including cement and aggregates. This offers a promising avenue for reducing the environmental impact and promoting sustainable construction practices by reducing the amount of energy consumed and resources required for concrete production, as well as the amount of waste being sent to landfills. This paper aims to provide a review of the use of waste ceramic in concrete. In essence, the paper is divided into several sections. The first section highlights the current environmental issues associated with concrete production and waste disposal. The second section deals with ceramics, its raw materials, production steps, and the different types of waste ceramic used in concrete. A literature review of the use of waste ceramic in concrete was included in the third section. The study reports different research on the use of waste ceramic and its impacts on the mechanical and durability properties of concrete. Full article
(This article belongs to the Special Issue Feature Papers in CivilEng)
Show Figures

Figure 1

16 pages, 6942 KiB  
Article
The Effects of Calcium Nitrite on the Mechanical Properties and Microstructure of Early-Age Frozen Cement Paste
by Lijun Wan, Maopei Yu, Enze Wu and Yongqi Zhao
Materials 2024, 17(10), 2461; https://doi.org/10.3390/ma17102461 (registering DOI) - 20 May 2024
Abstract
The objective of this paper is to investigate the effect of calcium nitrite (CN) on improving the mechanical properties and microstructures of early-frozen cement paste. Cement pastes containing 1%, 1.5%, 2%, 2.5%, and 3% CN were prepared. One batch of samples was frozen [...] Read more.
The objective of this paper is to investigate the effect of calcium nitrite (CN) on improving the mechanical properties and microstructures of early-frozen cement paste. Cement pastes containing 1%, 1.5%, 2%, 2.5%, and 3% CN were prepared. One batch of samples was frozen at −6 °C for 7 days and then cured at 20 °C, and the other batch of samples was directly cured at 20 °C as a control. The compressive strength, ultrasonic pulse velocity, and resistivity of all specimens at different target ages were measured under these two curing conditions. The hydration products and microstructures of typical samples were observed using XRD and scanning SEM. The results showed that the addition of 1.5% CN could promote cement hydration and enhance slurry densification, thereby increasing the compressive strength, ultrasonic pulse velocity, and electrical resistivity of the slurry, and positively affecting the early freezing resistance of the slurry. However, when the CN dosage exceeded 1.5%, the internal structure of the slurry was loose and porous due to the generation of a large amount of nitrite–AFm, which negatively affects the properties of the cement paste. In addition, the effectiveness of CN is only limited to temperature environments above −6 °C. Concrete antifreeze suitable for lower temperatures still requires further research. Full article
Show Figures

Figure 1

19 pages, 2968 KiB  
Article
Teaching–Learning-Based Optimization Algorithm with Stochastic Crossover Self-Learning and Blended Learning Model and Its Application
by Yindi Ma, Yanhai Li and Longquan Yong
Mathematics 2024, 12(10), 1596; https://doi.org/10.3390/math12101596 (registering DOI) - 20 May 2024
Abstract
This paper presents a novel variant of the teaching–learning-based optimization algorithm, termed BLTLBO, which draws inspiration from the blended learning model, specifically designed to tackle high-dimensional multimodal complex optimization problems. Firstly, the perturbation conditions in the “teaching” and “learning” stages of the original [...] Read more.
This paper presents a novel variant of the teaching–learning-based optimization algorithm, termed BLTLBO, which draws inspiration from the blended learning model, specifically designed to tackle high-dimensional multimodal complex optimization problems. Firstly, the perturbation conditions in the “teaching” and “learning” stages of the original TLBO algorithm are interpreted geometrically, based on which the search capability of the TLBO is enhanced by adjusting the range of values of random numbers. Second, a strategic restructuring has been ingeniously implemented, dividing the algorithm into three distinct phases: pre-course self-study, classroom blended learning, and post-course consolidation; this structural reorganization and the random crossover strategy in the self-learning phase effectively enhance the global optimization capability of TLBO. To evaluate its performance, the BLTLBO algorithm was tested alongside seven distinguished variants of the TLBO algorithm on thirteen multimodal functions from the CEC2014 suite. Furthermore, two excellent high-dimensional optimization algorithms were added to the comparison algorithm and tested in high-dimensional mode on five scalable multimodal functions from the CEC2008 suite. The empirical results illustrate the BLTLBO algorithm’s superior efficacy in handling high-dimensional multimodal challenges. Finally, a high-dimensional portfolio optimization problem was successfully addressed using the BLTLBO algorithm, thereby validating the practicality and effectiveness of the proposed method. Full article
Show Figures

Figure 1

17 pages, 9970 KiB  
Article
Mining Multimodal Travel Mobilities with Big Ridership Data: Comparative Analysis of Subways and Taxis
by Hui Zhang, Yu Cui and Jianmin Jia
Sustainability 2024, 16(10), 4305; https://doi.org/10.3390/su16104305 (registering DOI) - 20 May 2024
Abstract
Understanding traveler mobility in cities is significant for urban planning and traffic management. However, most traditional studies have focused on travel mobility in a single traffic mode. Only limited studies have focused on the travel mobility associated with multimodal transportation. Subways are considered [...] Read more.
Understanding traveler mobility in cities is significant for urban planning and traffic management. However, most traditional studies have focused on travel mobility in a single traffic mode. Only limited studies have focused on the travel mobility associated with multimodal transportation. Subways are considered a green travel mode with large capacity, while taxis are an energy-consuming travel mode that provides a personalized service. Exploring the relationship between subway mobility and taxi mobility is conducive to building a sustainable multimodal transportation system, such as one with mobility as a service (MaaS). In this study, we propose a framework for comparatively analyzing the travel mobilities associated with subways and taxis. Firstly, we divided taxi trips into three groups: competitive, cooperative, and complementary. Voronoi diagrams based on subway stations were introduced to divide regions. An entropy index was adopted to measure the mix of taxi trips. Secondly, subway and taxi trip networks were constructed based on the divided regions. The framework was tested based on the automatic fare collection (AFC) data and global positioning system (GPS) data of a subway in Beijing, China. The results showed that the proportions of taxi competition, taxi cooperation, and taxi complements were 9.1%, 35.6%, and 55.3%, respectively. The entropy was large in the central city and small in the suburbs. Moreover, it was found that the subway trip network was connected more closely than the taxi network. However, the unbalanced condition of taxis is more serious than that of the subway. Full article
(This article belongs to the Special Issue Sustainable Transport Research and Railway Network Performance)
Show Figures

Figure 1

20 pages, 4545 KiB  
Article
Identification and Expression Profile of NCED Genes in Arachis hypogaea L. during Drought Stress
by Ao Chen, Jingyan Li, Heping Wang and Puyan Zhao
Int. J. Mol. Sci. 2024, 25(10), 5564; https://doi.org/10.3390/ijms25105564 (registering DOI) - 20 May 2024
Abstract
Peanut (Arachis hypogaea L.) is an important crop that provides essential proteins and oils for human and animal consumption. 9-cis-epoxycarotenoid dioxygenase (NCED) have been found can play a vital role in abscisic acid (ABA) biosynthesis and may be a response to drought [...] Read more.
Peanut (Arachis hypogaea L.) is an important crop that provides essential proteins and oils for human and animal consumption. 9-cis-epoxycarotenoid dioxygenase (NCED) have been found can play a vital role in abscisic acid (ABA) biosynthesis and may be a response to drought stress. Until now, in Arachis hypogaea, no information about the NCED gene family has been reported and the importance of NCED-related drought tolerance is unclear. In this study, eight NCED genes in Arachis hypogaea, referred to as AhNCEDs, are distributed across eight chromosomes, with duplication events in AhNCED1 and AhNCED2, AhNCED3 and AhNCED4, and AhNCED6 and AhNCED7. Comparative analysis revealed that NCED genes are highly conserved among plant species, including Pisum sativum, Phaseolus vulgaris, Glycine max, Arabidopsis thaliana, Gossypium hirsutum, and Oryza sativa. Further promoter analysis showed AhNCEDs have ABA-related and drought-inducible elements. The phenotyping of Arachis hypogaea cultivars NH5 and FH18 demonstrated that NH5 is drought-tolerant and FH18 is drought-sensitive. Transcriptome expression analysis revealed the differential regulation of AhNCEDs expression in both NH5 and FH18 cultivars under drought stress. Furthermore, compared to the Arachis hypogaea cultivar FH18, the NH5 exhibited a significant upregulation of AhNCED1/2 expression under drought. To sum up, this study provides an insight into the drought-related AhNCED genes, screened out the potential candidates to regulate drought tolerance and ABA biosynthesis in Arachis hypogaea. Full article
(This article belongs to the Special Issue Advance in Plant Abiotic Stress)
Show Figures

Figure 1

19 pages, 596 KiB  
Article
Age and Burnout: The Mediating Role of Emotion-Regulation Strategies
by Bianca Mendes and Isabel Miguel
Soc. Sci. 2024, 13(5), 274; https://doi.org/10.3390/socsci13050274 (registering DOI) - 20 May 2024
Abstract
In the context of an aging workforce, this study explores the interaction between age, burnout, and emotion-regulation strategies (ERS). Despite recognized challenges in managing age diversity and employee well-being, the direct impact of age on burnout and the mediating role of ERS remain [...] Read more.
In the context of an aging workforce, this study explores the interaction between age, burnout, and emotion-regulation strategies (ERS). Despite recognized challenges in managing age diversity and employee well-being, the direct impact of age on burnout and the mediating role of ERS remain unexplored. Analyzing data from 604 Portuguese workers (aged 18–65), this study utilizes a mediation model to investigate if age is directly related to the main problems that affect the workforce presently, focusing specifically on burnout and the role that emotion-regulation abilities (cognitive reappraisal and expressive suppression) have in controlling the burnout effects (measured by emotional exhaustion and disengagement). The findings indicate that age does not have a straightforward linear relationship with burnout or ERS choice. Although age alone does not significantly influence burnout outcomes, ERS markedly impacts these outcomes, suggesting that factors beyond age predominantly drive ERS selection and effectiveness in managing burnout. This study emphasizes the critical role of ERS in influencing burnout, suggesting the importance of equipping workers with effective emotion-regulation skills to mitigate burnout risks. Further research is warranted to disentangle the complex interrelations among age, burnout, and ERS in organizational contexts. Full article
Show Figures

Figure 1

Open Access Journals

Browse by Indexing Browse by Subject Selected Journals
Back to TopTop