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Wildlife-vehicle collisions in the Mid-Zambezi Valley: Driver perceptions and species-specific risk patterns 中赞比西河流域的野生动物车辆碰撞:驾驶员的感知和特定物种的风险模式
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-13 DOI: 10.1016/j.sciaf.2025.e03137
Nobert Tafadzwa Mukomberanwa , Patmore Ngorima , Simbai Mutematemi , Augustine Malunga , Jeremiah Chakuya , Martin Chimwe , Peter Chimwanda , Thomas Musora , Honest Komborero Madamombe , Blessing Onias Munetsi , Ricardo Moyo
Wildlife-vehicle collisions (WVCs) are an escalating threat in the Mid-Zambezi Valley, a critical transboundary wildlife corridor where expanding transport infrastructure increasingly intersects major movement routes of ecologically important species. However, limited empirical work has combined driver-based data with advanced machine learning techniques to characterize species-specific collision risks in this region. This study surveyed 100 truck drivers operating along the A1 highway and analysed collision records using K-means and Hierarchical Agglomerative Clustering (HAC) to identify functional species groups and spatial–temporal risk patterns. Results show that 73 % of collisions occur at night, largely involving nocturnal or crepuscular species such as hyenas, civets, and warthogs, while high-impact megafauna including elephants, lions, and buffalo form a distinct cluster associated with severe safety risks and predictable movement corridors. Driver age and cumulative experience were significantly associated with collision exposure, although perceptions of WVC causes diverged from empirical patterns, highlighting gaps in road safety awareness. The integration of unsupervised machine learning with ecological interpretation represents an advance over previous studies by enabling data-driven, species-specific risk profiling rather than generalized hotspot mapping. These findings provide new knowledge on functional WVC groupings in African savannah systems and offer evidence-based guidance for mitigation, including targeted nighttime traffic management, vegetation clearance at key points, and corridor-sensitive infrastructure such as wildlife crossings. By informing conservation planning, road safety policy, and regional connectivity management, the study contributes to continental priorities under the African Union’s Agenda 2063 and supports SDG 15.7 on reducing threats to biodiversity.
野生动物车辆碰撞(WVCs)是中赞比西河流域日益严重的威胁,这是一个重要的跨境野生动物走廊,不断扩大的交通基础设施日益交叉生态重要物种的主要运动路线。然而,有限的实证工作将基于驾驶员的数据与先进的机器学习技术相结合,以表征该地区特定物种的碰撞风险。本研究调查了100名沿A1高速公路行驶的卡车司机,并使用k均值和层次聚集聚类(HAC)分析了碰撞记录,以确定功能物种群和时空风险模式。结果表明,73%的碰撞发生在夜间,主要涉及夜间或黄昏的物种,如鬣狗、果子狸和疣猪,而高冲击力的巨型动物,包括大象、狮子和水牛,形成了一个独特的集群,与严重的安全风险和可预测的运动走廊相关。驾驶员年龄和累积经验与碰撞暴露显著相关,尽管对交通事故原因的认识与经验模式不同,突出了道路安全意识的差距。无监督机器学习与生态解释的整合代表了以往研究的进步,通过实现数据驱动的物种特定风险分析,而不是广义的热点映射。这些发现提供了关于非洲大草原系统WVC功能性分组的新知识,并为缓解措施提供了基于证据的指导,包括有针对性的夜间交通管理、关键点的植被清除以及走廊敏感基础设施(如野生动物过境点)。通过为保护规划、道路安全政策和区域连通性管理提供信息,该研究有助于非洲联盟《2063年议程》下的非洲大陆优先事项,并支持关于减少生物多样性威胁的可持续发展目标15.7。
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引用次数: 0
MPS-OF-AS: An SDN-based MPQUIC scheduler for software-defined cloud services MPS-OF-AS:用于软件定义云服务的基于sdn的MPQUIC调度器
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-12 DOI: 10.1016/j.sciaf.2025.e03134
John S. Wejin , Adeyinka A. Adewale , Kennedy O. Okopkujie , (SMIEEE)
The remarkable advancement in cloud data centre technologies has greatly enhanced interconnectivity, while concurrently driving exponential growth in data traffic. This skyrocketed data traffic affects the efficiency of cloud services that require high bandwidth, low latency, and reliability. Although Multipath Transmission Control Protocol (MPTCP) and Software-Defined Networking (SDN) have been opted as solutions to these challenges, MPTCP introduces additional latency due to its handshake mechanisms and performs suboptimally in dynamic and heterogeneous cloud environments. These latencies and scheduling inefficiencies affect application performance and quality of service delivery in modern data centres. To address these problems, this study proposes a Multipath Stream OpenFlow-Aware Scheduler (MPS-OF-AS) for Multipath QUIC (MPQUIC), in an SDN-enabled cloud environment. The proposed scheduler uses a two-stage scheduling strategy that synchronises network path selection with stream and SDN network feedback to optimise packet transmission. A prototype of MPQUIC integrated with MPS-OF-AS was implemented and evaluated using Mininet in a fat-tree data centre topology under varying network conditions. The results demonstrate that MPS-OF-AS consistently outperforms existing schedulers, achieving a throughput of 481 Mbps, a fairness index of 84.7%, a latency of 68.5 ms, and a completion time of 85.6 s. These findings reveal that integrating SDN feedback with path-quality-aware scoring and stream scheduling enables more adaptive, efficient, and fair resource allocation in multipath protocols, making MPS-OF-AS a scalable and effective scheduling suited for SDN-enabled cloud environments and Artificial Intelligence(AI) driven networks.
云数据中心技术的显著进步极大地增强了互联性,同时推动了数据流量的指数级增长。这种暴涨的数据流量影响了需要高带宽、低延迟和可靠性的云服务的效率。尽管多路径传输控制协议(MPTCP)和软件定义网络(SDN)已被选择作为应对这些挑战的解决方案,但MPTCP由于其握手机制而引入了额外的延迟,并且在动态和异构云环境中表现不佳。这些延迟和调度效率低下会影响现代数据中心的应用程序性能和服务交付质量。为了解决这些问题,本研究提出了一种多路径流开放流感知调度器(MPS-OF-AS),用于支持sdn的云环境中的多路径QUIC (MPQUIC)。所提出的调度程序使用两阶段调度策略,将网络路径选择与流和SDN网络反馈同步,以优化数据包传输。在不同的网络条件下,使用Mininet在胖树数据中心拓扑结构中实现并评估了MPQUIC与MPS-OF-AS集成的原型。结果表明,MPS-OF-AS始终优于现有的调度器,实现了481 Mbps的吞吐量、84.7%的公平性指数、68.5 ms的延迟和85.6 s的完成时间。这些发现表明,将SDN反馈与路径质量感知评分和流调度相结合,可以在多路径协议中实现更自适应、更高效、更公平的资源分配,使MPS-OF-AS成为一种可扩展的、有效的调度,适用于支持SDN的云环境和人工智能(AI)驱动的网络。
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引用次数: 0
Hand exoskeletons in stroke recovery: A systematic review of trends and technologies 手外骨骼在中风恢复:趋势和技术的系统回顾
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-11 DOI: 10.1016/j.sciaf.2025.e03133
Ebenezer Martey, Benedict Opoku-Antwi, Frank K.A. Nyarko
Upper limb impairments following stroke significantly limit patients’ ability to perform activities of daily living, creating a need for effective rehabilitation technologies. Hand exoskeletons have emerged as promising solutions, yet their design variations, technological capabilities, and clinical effectiveness remain insufficiently consolidated in the literature. This systematic review examines the design approaches, technological implementations, and clinical applications of hand exoskeletons for stroke rehabilitation. Following PRISMA guidelines, a comprehensive search of five databases (IEEE Xplore, PubMed, Scopus, ScienceDirect, and MDPI) identified studies published between 2010 and 2023 that presented original research involving prototype development for stroke rehabilitation. Data extraction captured device architecture, actuation mechanisms, sensing modalities, control strategies, and clinical testing characteristics. A total of 47 devices met inclusion criteria and were classified as soft (n = 18), rigid (n = 19), or hybrid (n = 10). Actuation technologies consisted primarily of electric motors (57 %), pneumatic systems (26 %), shape memory alloys (9 %), and series elastic actuators (8), with force outputs varying across device categories (soft: 2–6 N; rigid: 8–15 N; hybrid: 6–10 N). Only 38 % of devices advanced to clinical testing, commonly with small cohorts (median n = 8). Comparative analysis identified consistent trade-offs between force generation, wearability, and control complexity. These findings indicate three emerging developmental trajectories: lightweight wearable systems, sensor-rich adaptive devices, and platforms optimized for telerehabilitation. Persistent gaps include limited thumb functionality, inadequate personalization, and insufficient clinical validation. Addressing these challenges through improved thumb opposition mechanisms, rapid customization strategies, AI-assisted control, and brain–computer interface integration may enhance the effectiveness and translational potential of future hand exoskeleton technologies.
中风后的上肢损伤严重限制了患者进行日常生活活动的能力,因此需要有效的康复技术。手外骨骼已经成为一种很有前途的解决方案,但它们的设计变化、技术能力和临床有效性在文献中仍然没有得到充分的巩固。这篇系统的综述研究了手部外骨骼在中风康复中的设计方法、技术实现和临床应用。遵循PRISMA指南,对五个数据库(IEEE Xplore、PubMed、Scopus、ScienceDirect和MDPI)进行全面检索,确定了2010年至2023年间发表的涉及卒中康复原型开发的原始研究。数据提取捕获了设备结构、驱动机制、传感模式、控制策略和临床测试特征。共有47个器械符合纳入标准,分为软性(n = 18)、刚性(n = 19)和混合型(n = 10)。驱动技术主要由电动机(57%)、气动系统(26%)、形状记忆合金(9%)和系列弹性执行器(8%)组成,其力输出在不同设备类别(软:2-6 N;刚性:8 - 15 N;混合:6-10 N)之间变化。只有38%的器械进入了临床试验,通常是小队列(中位数n = 8)。对比分析确定了力产生、可穿戴性和控制复杂性之间的一致权衡。这些发现表明了三种新兴的发展轨迹:轻量级可穿戴系统、传感器丰富的自适应设备和优化的远程康复平台。持续存在的差距包括拇指功能有限、个性化不足和临床验证不足。通过改进拇指对抗机制、快速定制策略、人工智能辅助控制和脑机接口集成来解决这些挑战,可能会提高未来手外骨骼技术的有效性和转化潜力。
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引用次数: 0
Tuning the properties of coumarin-based small molecule donors via strong acceptor substitution for advanced donor/PCBM organic solar cells 香豆素基小分子供体的性质通过强受体取代先进的供体/PCBM有机太阳能电池
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-11 DOI: 10.1016/j.sciaf.2025.e03135
Walid Taouali, Mourad Chemek, Kamel Alimi
In this study, we designed and evaluated high-efficiency coumarin-based small-molecule donors for organic solar cells (OSCs) using density functional theory (DFT) calculations to address the challenge of improving charge transfer and photovoltaic performance. Building on previous work, we designed a series of four new molecules (M1-M4) by replacing the phenyl unit in the reference structure 2-((2E,4E)-1-(7-(diethylamino)-2-oxo-2H-chromen-3-yl)-5-(4-(dimethylamino)phenyl)penta-2,4-dien-1-ylidene) malononitrile (MR) with different strong electron-accepting groups, providing a systematic approach to enhance donor-acceptor interactions. The designed molecules exhibit significantly reduced HOMO-LUMO energy gaps (1.51–1.72 eV) compared to MR (1.87 eV), red-shifted maximum absorption (553–614 nm versus 518 nm), higher dipole moments (>10 D), and lower electron reorganization energies, indicating improved charge transport properties. The predicted power conversion efficiencies (PCE) of donor/PCBM heterojunctions increase from 5% for MR/PCBM to over 9% with the newly designed molecules, underscoring a marked improvement in photovoltaic performance. These findings provide new insights into the structure-property relationships governing optical absorption, intramolecular charge transfer, and charge mobility, establishing design rules for high-performance small-molecule donors. This study introduces a novel, systematic molecular design strategy that can guide future development of tunable, efficient donor materials, offering immediately relevant knowledge for the wider research community focused on next-generation OSCs.
在本研究中,我们利用密度泛函理论(DFT)计算设计并评估了有机太阳能电池(OSCs)中基于香豆素的高效小分子供体,以解决改善电荷转移和光伏性能的挑战。在之前工作的基础上,我们设计了一系列的四个新分子(M1-M4),通过用不同的强电子接受基团取代参考结构2-((2E,4E)-1-(7-(二乙基氨基)-2-氧- 2h -铬-3-基)-5-(4-(二甲氨基)苯基)五-2,4-二-1-乙基)丙二腈(MR)中的苯基单元,提供了一种系统的方法来增强供体-受体相互作用。与MR (1.87 eV)相比,设计的分子具有显著降低的HOMO-LUMO能隙(1.51-1.72 eV),红移最大吸收(553-614 nm),更高的偶极矩(>10 D)和更低的电子重组能,表明电荷输运性能得到改善。使用新设计的分子,供体/PCBM异质结的预测功率转换效率(PCE)从MR/PCBM的5%提高到9%以上,这表明光伏性能有了显著提高。这些发现为光学吸收、分子内电荷转移和电荷迁移的结构-性质关系提供了新的见解,并建立了高性能小分子供体的设计规则。本研究介绍了一种新的、系统的分子设计策略,可以指导未来可调、高效的供体材料的开发,为更广泛的研究团体关注下一代osc提供即时相关的知识。
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引用次数: 0
Al-Mg-MoS2 reinforced hybrid metal matrix: Bio-machinability characteristics Al-Mg-MoS2增强杂化金属基体:生物可加工性特性
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-10 DOI: 10.1016/j.sciaf.2025.e03131
Narmada Ch , Rajesh S , T. Ramesh , Jeyaprakash K , Belete Sirahbizu
This study examines the biomachinability of Al–Mg–MoS₂ hybrid metal matrix composites (MMCs) produced using powder metallurgy (PM) in detail. This study is to utilize a specialized microbe, Thiobacillus Novellus, to machine Al-Mg-MoS₂. For biomachining, the required number of samples is prepared through a PM process with different composite formulations, including Al (90 %), Mg (5–7 %), and MoS₂ (3–5 %). To perform biomachining studies, the following bioprocess parameters are considered (shaking speed, pH, and temperature). The experimental design utilized an orthogonal array. The findings indicated that shaking speed, pH, and temperature had a significant impact on microbial machining efficiency. Sample 3 (Al–Mg–MoS₂: 90–5–5) demonstrated a balanced performance in terms of achieving better Surface Roughness (Ra) and Specific Materail Removal Rate (SMRR) compared to Samples 1 and 2. The MOGWO and Fuzzy MOGWO methods were utilized to prioritize the optimal process parameters. The approach determined the optimal parameters of 80 rpm, pH 2.5, and 35 °C, utilizing Sample 3 (Al–Mg–MoS₂: 90–5–5), which yielded a predicted Ra of 1.5708 µm and SMRR of 1.2795 mg/hr·cm², with an error margin of <1.5 %. This study is the first of its kind to use a fuzzy multi-objective Grey Wolf Optimization framework to optimize Ra and SMRR simultaneously, and it is also the first to apply biomachining to Al-Mg-MoS₂ hybrid metal matrix composites using Thiobacillus novellus. Research in biomachining has come a long way with this integrated microstructure-biological-optimization method.
本研究详细考察了粉末冶金制备的Al-Mg-MoS 2杂化金属基复合材料(MMCs)的生物可塑性。这项研究是利用一种特殊的微生物,新硫杆菌,来加工Al-Mg-MoS 2。对于生物机械加工,通过PM工艺制备所需数量的样品,使用不同的复合配方,包括Al (90%), Mg(5 - 7%)和MoS 2(3 - 5%)。为了进行生物机械加工研究,考虑了以下生物工艺参数(震动速度,pH值和温度)。实验设计采用正交阵列。结果表明,振动速度、pH和温度对微生物加工效率有显著影响。与样品1和2相比,样品3 (Al-Mg-MoS 2: 90-5-5)在获得更好的表面粗糙度(Ra)和特定材料去除率(SMRR)方面表现出平衡的性能。采用MOGWO和模糊MOGWO方法对最优工艺参数进行排序。该方法确定了样品3 (Al-Mg-MoS 2: 90-5-5)的最佳参数为80 rpm、pH 2.5和35°C,预测Ra为1.5708µm, SMRR为1.2795 mg/hr·cm²,误差范围为1.5%。本研究首次采用模糊多目标灰狼优化框架同时优化Ra和SMRR,也是首次将生物机械加工应用于Al-Mg-MoS 2杂化金属基复合材料。这种微结构-生物优化的集成方法使生物机械加工的研究取得了长足的进展。
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引用次数: 0
Analysis of aquaculture methods, socio-economic benefits, and challenges faced by small-scale fish farmers in Chiredzi Rural District, Zimbabwe 分析津巴布韦奇雷兹农村地区小规模养鱼户的水产养殖方法、社会经济效益和面临的挑战
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-08 DOI: 10.1016/j.sciaf.2025.e03128
Rodney T Muringai, Walter Musakwa
Aquaculture plays a pivotal role in enhancing food security and socioeconomic development, particularly in rural areas. In the Chiredzi Rural District, aquaculture is expanding rapidly to improve food and nutrition security, while enhancing livelihoods and climate resilience. However, a significant knowledge gap exists regarding aquaculture methods, socio-economic benefits, and challenges faced by small-scale fish farmers in this area. Therefore, this study aimed to analyse the methods used by fish farmers, assess the socio-economic benefits, and identify the challenges they face in the Chiredzi Rural District of Zimbabwe. Data were collected using a mixed-methods approach. A multistage sampling technique was used to select the target wards and the farmers. A semi-structured survey questionnaire was administered to 120 fish farmers in Wards 9 (Twananani), 10 (Batanai) and 11 (Chikombedzi). The findings show that 85 % of farmers use earthen pond systems and mainly cultivate Nile Tilapia. Aquaculture is not profitable in the Chiredzi Rural District, but it contributes to food and nutritional security. The main challenges for fish farmers include adverse weather, disease, and limited technical assistance. To enhance the sustainability and profitability of small-scale aquaculture in Chiredzi Rural District, it is recommended that local government and development partners invest in targeted technical support and climate-resilient infrastructure for fish farmers.
水产养殖在加强粮食安全和社会经济发展方面发挥着关键作用,特别是在农村地区。在Chiredzi农村地区,水产养殖正在迅速扩大,以改善粮食和营养安全,同时提高生计和气候适应能力。然而,在该地区的水产养殖方法、社会经济效益和小规模养鱼户面临的挑战方面存在着重大的知识差距。因此,本研究旨在分析津巴布韦Chiredzi农村地区养鱼户使用的方法,评估其社会经济效益,并确定他们面临的挑战。采用混合方法收集数据。采用多阶段抽样技术选择目标病区和农户。对第9区(Twananani)、第10区(Batanai)和第11区(Chikombedzi)的120名养鱼户进行了半结构化问卷调查。调查结果显示,85%的农民使用土池系统,主要养殖尼罗罗非鱼。在Chiredzi农村地区,水产养殖无利可图,但它有助于粮食和营养安全。养鱼户面临的主要挑战包括恶劣天气、疾病和有限的技术援助。为了提高Chiredzi农村地区小规模水产养殖的可持续性和盈利能力,建议地方政府和发展伙伴为养鱼户提供有针对性的技术支持和气候适应型基础设施投资。
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引用次数: 0
Digitization and the energy paradox: Does broadband adoption increase the electricity intensity of African businesses? 数字化与能源悖论:宽带的采用会增加非洲企业的用电强度吗?
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-08 DOI: 10.1016/j.sciaf.2025.e03130
Youssef Bouazizi, Mohammed Ghazouani
The digitization of African firms reveals a persistent energy paradox: while digital tools can improve efficiency, they may also intensify electricity demand in contexts marked by infrastructural fragility. This study provides the first multi-country, firm-level assessment of how broadband adoption shapes electricity intensity in Africa, using 10,755 observations from the post COVID World Bank Enterprise Surveys. To address endogeneity, the analysis relies on a causal identification strategy based on Instrumental Variables with the Two Stage Least Squares estimator and the Limited Information Maximum Likelihood estimator. The results show that broadband access increases electricity intensity in the short run, and that conventional estimations underestimate this effect due to measurement error and self-selection. At the same time, broadband adoption significantly promotes product and process innovation, stimulates investment in research and development, and reduces financial obstacles, revealing indirect channels that may support efficiency gains over time. A comprehensive set of robustness and sensitivity tests confirms the stability of these findings across alternative specifications, subsamples, and placebo exercises. By uncovering both the direct and indirect effects of digital integration, this study provides new evidence on the conditions under which connectivity can support Africa’s productive modernization. The results underscore the need for complementary reforms, including reliable electricity infrastructure, strengthened digital and energy capabilities, and expanded access to green and digital finance, in order to transform digitalization into a driver of sustainable energy transitions.
非洲企业的数字化揭示了一个持续存在的能源悖论:虽然数字工具可以提高效率,但在基础设施脆弱的背景下,它们也可能加剧电力需求。本研究利用世界银行新冠肺炎疫情后企业调查的10755项观察结果,首次对宽带采用如何影响非洲电力强度进行了多国、公司层面的评估。为了解决内生性问题,分析依赖于基于工具变量的因果识别策略,使用两阶段最小二乘估计器和有限信息最大似然估计器。结果表明,宽带接入在短期内增加了电力强度,由于测量误差和自我选择,传统的估计低估了这种影响。同时,宽带的采用显著地促进了产品和流程的创新,刺激了对研究和开发的投资,并减少了财务障碍,揭示了可能随着时间的推移支持效率提高的间接渠道。一组全面的稳健性和敏感性测试证实了这些发现在不同规格、子样本和安慰剂练习中的稳定性。通过揭示数字一体化的直接和间接影响,本研究为互联互通支持非洲生产性现代化的条件提供了新的证据。结果强调需要进行配套改革,包括可靠的电力基础设施,加强数字和能源能力,扩大绿色和数字金融的可及性,以将数字化转变为可持续能源转型的驱动力。
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引用次数: 0
The power of Ficus petiolaris: A deep dive into its phytochemistry, therapeutic benefits, and industrial applications 小叶榕的力量:深入探讨其植物化学,治疗效益和工业应用
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-08 DOI: 10.1016/j.sciaf.2025.e03129
Emilia Ababio , Deborah A. Kwartemaa , Priscilla Mensah , Kennedy A. Baah , Sampson K. Kyei
Traditional medical systems have long utilized various parts of Ficus petiolaris, including leaves, stem bark, aerial roots, fruits, buds, and latex, to prepare remedies for a wide range of ailments. Native primarily to Mexico, this species has been used in traditional medicine for managing intestinal parasites, rheumatism, fever, chest pain, fractures, herpes infections, wound healing, and female reproductive challenges. Ethnomedicinal applications have also been documented across Africa, particularly in Nigeria, Cameroon, the Ivory Coast, Ghana, and Sierra Leone. Despite its extensive traditional use, the extracts remain largely uncharacterized, with only certain chemical classes, such as phenolic compounds, terpenoids and phytosterols, furanocoumarins and xanthotoxin, identified. Recent phytochemical studies show that 91 distinct secondary metabolites have been identified from the Ficus species covered in this review, with phenolic compounds being the most dominant group. This review consolidates existing knowledge on the ethnopharmacology, phytochemistry, and preclinical (in vitro and in vivo) activities of F. petiolaris, highlighting its therapeutic potential in antioxidant, antibacterial, and other health-promoting activities. Secondary metabolites, including tannins, saponins, flavonoids, alkaloids, and phenolic acids, also offer opportunities for value-added industrial applications. Importantly, the species lacks rigorously controlled clinical trials, underscoring the need for future research to validate safety and efficacy and to support the discovery of novel medicinal agents. This review emphasizes the significance of F. petiolaris as a promising medicinal plant and advocates for comprehensive scientific investigation to realize its therapeutic potential fully.
传统的医疗系统长期以来一直利用小叶榕的各个部分,包括叶子、茎皮、气根、果实、芽和乳胶,来准备治疗各种疾病的药物。该物种主要原产于墨西哥,在传统医学中用于治疗肠道寄生虫、风湿病、发烧、胸痛、骨折、疱疹感染、伤口愈合和女性生殖困难。在整个非洲,特别是在尼日利亚、喀麦隆、科特迪瓦、加纳和塞拉利昂,也记录了民族医药应用。尽管其传统用途广泛,但提取物在很大程度上仍未被表征,仅确定了某些化学类别,如酚类化合物、萜类和植物甾醇、呋喃香豆素和黄毒素。最近的植物化学研究表明,从本文所涵盖的榕树物种中鉴定出91种不同的次生代谢物,其中酚类化合物是最主要的一类。本文综述了小叶黄霉的民族药理学、植物化学和临床前(体内和体外)活性,强调了其在抗氧化、抗菌和其他健康促进方面的治疗潜力。次生代谢物,包括单宁、皂苷、类黄酮、生物碱和酚酸,也为增值工业应用提供了机会。重要的是,该物种缺乏严格控制的临床试验,强调需要未来的研究来验证安全性和有效性,并支持新药物的发现。本文强调了小叶羽翘作为一种极具潜力的药用植物的重要意义,并主张对其进行全面的科学研究,以充分发挥其治疗潜力。
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引用次数: 0
Intuitionistic fuzzy mathematical model for optimization of multi-objective cropland allocation problem in small scale irrigation system: A case-study in Sidama region, Ethiopia 小规模灌溉系统多目标耕地分配优化的直觉模糊数学模型——以埃塞俄比亚Sidama地区为例
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-08 DOI: 10.1016/j.sciaf.2025.e03127
Demmelash Mollalign Moges , Alemnesh Abebe Lema , Zerihun Kinfe Berhanu
In the developing country, the primary inquiry is, “How can the limited land resources for various crops be managed to achieve the minimum required consumption goals based on irrigated agriculture?” Therefore, to feed the growing population while using limited resources, it is imperative to discover a scientific method to model and solve the multi-objective cropland allocation problem (MOCLAP). Existing literature indicates that classical optimization methods are commonly employed for solving MOCLAPs. However, the deterministic nature of crop yield, production costs, and profits in classical optimization methods presents limitations in real-world scenarios due to the influence of various uncontrollable factors. Furthermore, managing uncertain boundary values poses a significant challenge for existing optimization techniques. Thus, this paper not only developed a novel scientific method to model and solve a MOCLAP by addressing these challenges but also analyzed its optimal results with farmer experiences in small-scale irrigation-based crop production. By incorporating uncertainties inherent in the crop production planning process through extended-membership functions, the study employs intuitionistic fuzzy compensatory techniques for multi-objective optimization. The results demonstrate significant improvements in net profit and effective utilization of irrigation land, with increases of 22% and 65%, respectively, compared to farmers’ previous experiences in the Sidama region, Ethiopia. Moreover, a comparative analysis of the obtained optimal results with those derived from existing optimization methods highlights the non-dominated nature of the proposed method. Sensitivity analysis has also been done on the compensation parameter.
在发展中国家,主要的问题是“如何管理各种作物的有限土地资源,以实现基于灌溉农业的最低要求消费目标?”因此,为了在有限的资源条件下养活不断增长的人口,寻找一种科学的方法来模拟和解决多目标耕地分配问题(MOCLAP)势在必行。现有文献表明,求解MOCLAPs通常采用经典的优化方法。然而,由于各种不可控因素的影响,经典优化方法中作物产量、生产成本和利润的确定性在现实场景中存在局限性。此外,管理不确定的边界值对现有的优化技术提出了重大挑战。因此,本文不仅通过解决这些挑战,开发了一种新的科学方法来建模和求解MOCLAP,而且结合农民在小规模灌溉作物生产中的经验分析了其最佳结果。通过扩展隶属函数将作物生产规划过程中固有的不确定性纳入研究,采用直觉模糊补偿技术进行多目标优化。结果表明,与埃塞俄比亚西达马地区农民以往的经验相比,该地区的纯利润和灌溉土地的有效利用分别显著提高了22%和65%。此外,将得到的最优结果与现有优化方法的结果进行对比分析,突出了所提方法的非支配性。对补偿参数进行了灵敏度分析。
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引用次数: 0
Determinants of knowledge, attitudes, and practices regarding campus sustainability: A field study at Cairo University 关于校园可持续性的知识、态度和实践的决定因素:开罗大学的一项实地研究
IF 3.3 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2025-12-05 DOI: 10.1016/j.sciaf.2025.e03126
Mahmoud Hassan Said , Naglaa Mohamed Hamed , Doaa Haridy , Sherien Moustafa , Sultan Al-Ghtanyi , Diaa S. Metwally , Suzan Abdel-Rahman
Universities are increasingly seeking to transform into green institutions by implementing sustainability principles that promote environmental awareness. This study investigates the determinants of knowledge, attitudes, and practices to better understand the drivers of campus sustainability. A total of 829 faculty members and students from various faculties at Cairo University were interviewed between July 1 and August 31, 2024. The average age of participants was 29.57 years. Most participants were female, resided in urban areas, and studied in colleges of natural sciences. Regression analysis showed that age, rural residence, and academic background positively influenced campus sustainability knowledge. Faculty members reported higher knowledge levels than students, while students showed more positive attitudes, especially in their final academic years or postgraduate studies. Sustainable practices were more prevalent among males, students in practical colleges, and those majoring in the Humanities, Social Sciences, and Arts. Findings also confirmed a strong relationship between knowledge, attitudes, and practices. Targeted interventions should focus on enhancing students' knowledge of sustainability, fostering positive attitudes among faculty members, and implementing gender-sensitive activities tailored to specific academic disciplines.
越来越多的大学通过实施可持续发展原则,提高环境意识,寻求转型为绿色机构。本研究调查了知识、态度和实践的决定因素,以更好地理解校园可持续发展的驱动因素。在2024年7月1日至8月31日期间,共采访了开罗大学各院系的829名教师和学生。参与者的平均年龄为29.57岁。大多数参与者是女性,居住在城市地区,在自然科学学院学习。回归分析显示,年龄、农村居住、学历对校园可持续发展知识有正向影响。教师的知识水平高于学生,而学生则表现出更积极的态度,尤其是在他们的最后学年或研究生学习中。可持续实践在男性、实用学院的学生以及人文、社会科学和艺术专业的学生中更为普遍。研究结果还证实了知识、态度和实践之间的密切关系。有针对性的干预措施应侧重于提高学生对可持续性的认识,培养教师的积极态度,并针对具体学科实施对性别问题敏感的活动。
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引用次数: 0
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Scientific African
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