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Altered Iron-Mediated Metabolic Homeostasis Governs the Efficacy and Toxicity of Tripterygium Glycosides Tablets Against Rheumatoid Arthritis 铁介导的新陈代谢平衡改变制约着三尖杉苷片治疗类风湿性关节炎的疗效和毒性
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2024.04.003

Rheumatoid arthritis (RA), a globally increasing autoimmune disorder, is associated with increased disability rates due to the disruption of iron metabolism. Tripterygium glycoside tablets (TGTs), a Tripterygium wilfordii Hook. f. (TwHF)-based therapy, exhibit satisfactory clinical efficacy for RA treatment. However, drug-induced liver injury (DILI) remains a critical issue that hinders the clinical application of TGTs, and the molecular mechanisms underlying the efficacy and toxicity of TGTs in RA have not been fully elucidated. To address this problem, we integrated clinical multi-omics data associated with the anti-RA efficacy and DILI of TGTs with the chemical and target profiling of TGTs to perform a systematic network analysis. Subsequently, we identified effective and toxic targets following experimental validation in a collagen-induced arthritis (CIA) mouse model. Significantly different transcriptome–protein–metabolite profiles distinguishing patients with favorable TGTs responses from those with poor outcomes were identified. Intriguingly, the clinical efficacy and DILI of TGTs against RA were associated with metabolic homeostasis between iron and bone and between iron and lipids, respectively. Particularly, the signal transducer and activator of transcription 3 (STAT3)–hepcidin (HAMP)/lipocalin 2 (LCN2)–tartrate-resistant acid phosphatase type 5 (ACP5) and STAT3–HAMP–acyl-CoA synthetase long-chain family member 4 (ACSL4)–lysophosphatidylcholine acyltransferase 3 (LPCAT3) axes were identified as key drivers of the efficacy and toxicity of TGTs. TGTs play dual roles in ameliorating CIA-induced pathology and in inducing hepatic dysfunction, disruption of lipid metabolism, and hepatic lipid peroxidation. Notably, TGTs effectively reversed “iron–bone” disruptions in the inflamed joint tissues of CIA mice by inhibiting the STAT3–HAMP/LCN2–ACP5 axis, subsequently leading to “iron–lipid” disturbances in the liver tissues via modulation of the STAT3–HAMP–ACSL4–LPCAT3 axis. Additional bidirectional validation experiments were conducted using MH7A and AML12 cells to confirm the bidirectional regulatory effects of TGTs on key targets. Collectively, our data highlight the association between iron-mediated metabolic homeostasis and the clinical efficacy and toxicity of TGT in RA therapy, offering guidance for the rational clinical use of TwHF-based therapy with dual therapeutic and toxic potential.

类风湿性关节炎(RA)是一种全球性的自身免疫性疾病,由于铁代谢紊乱而导致致残率增加。三尖杉苷片(TGTs)是一种基于三尖杉(Tripterygium wilfordii Hook. f.,TwHF)的疗法,对治疗类风湿性关节炎具有令人满意的临床疗效。然而,药物性肝损伤(DILI)仍然是阻碍TGTs临床应用的关键问题,而且TGTs在RA中的疗效和毒性的分子机制尚未完全阐明。为了解决这一问题,我们整合了与TGTs抗RA疗效和DILI相关的临床多组学数据以及TGTs的化学和靶点图谱,进行了系统的网络分析。随后,我们在胶原诱导的关节炎(CIA)小鼠模型中进行了实验验证,确定了有效靶点和毒性靶点。我们发现了明显不同的转录组-蛋白质-代谢物图谱,这些图谱将TGTs反应良好的患者与反应不佳的患者区分开来。耐人寻味的是,TGTs 对 RA 的临床疗效和 DILI 分别与铁和骨之间以及铁和脂质之间的代谢平衡有关。特别是,信号转导子和转录激活子3(STAT3)-血钙素(HAMP)/脂钙素2(LCN2)-抗酒石酸磷酸酶5型(ACP5)和STAT3-HAMP-酰基-CoA合成酶长链家族成员4(ACSL4)-赖磷脂酰胆碱酰基转移酶3(LPCAT3)轴被确定为TGTs疗效和毒性的关键驱动因素。TGTs在改善CIA诱导的病理学和诱导肝功能失调、脂质代谢紊乱和肝脏脂质过氧化方面发挥着双重作用。值得注意的是,TGTs通过抑制STAT3-HAMP/LCN2-ACP5轴,有效逆转了CIA小鼠关节炎症组织中的 "铁骨 "紊乱,随后又通过调节STAT3-HAMP-ACSL4-LPCAT3轴,导致肝脏组织中的 "铁脂 "紊乱。我们还利用 MH7A 和 AML12 细胞进行了双向验证实验,以证实 TGTs 对关键靶标的双向调控作用。总之,我们的数据强调了铁介导的代谢平衡与 TGT 在 RA 治疗中的临床疗效和毒性之间的关联,为临床合理使用具有双重治疗和毒性潜力的基于 TwHF 的疗法提供了指导。
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引用次数: 0
Transparency: The Missing Link to Boosting AI Transformations in Chemical Engineering 透明度:促进化学工程领域人工智能变革的缺失环节
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2023.11.024

The issue of opacity within data-driven artificial intelligence (AI) algorithms has become an impediment to these algorithms’ extensive utilization, especially within sensitive domains concerning health, safety, and high profitability, such as chemical engineering (CE). In order to promote reliable AI utilization in CE, this review discusses the concept of transparency within AI utilizations, which is defined based on both explainable AI (XAI) concepts and key features from within the CE field. This review also highlights the requirements of reliable AI from the aspects of causality (i.e., the correlations between the predictions and inputs of an AI), explainability (i.e., the operational rationales of the workflows), and informativeness (i.e., the mechanistic insights of the investigating systems). Related techniques are evaluated together with state-of-the-art applications to highlight the significance of establishing reliable AI applications in CE. Furthermore, a comprehensive transparency analysis case study is provided as an example to enhance understanding. Overall, this work provides a thorough discussion of this subject matter in a way that—for the first time—is particularly geared toward chemical engineers in order to raise awareness of responsible AI utilization. With this vital missing link, AI is anticipated to serve as a novel and powerful tool that can tremendously aid chemical engineers in solving bottleneck challenges in CE.

数据驱动型人工智能(AI)算法的不透明性问题已成为这些算法广泛应用的障碍,尤其是在化学工程(CE)等涉及健康、安全和高利润的敏感领域。为了促进人工智能在化学工程领域的可靠应用,本综述讨论了人工智能应用中的透明度概念,该概念的定义基于可解释人工智能(XAI)概念和化学工程领域的关键特征。本综述还从因果关系(即人工智能预测与输入之间的相关性)、可解释性(即工作流程的操作原理)和信息性(即调查系统的机理见解)等方面强调了可靠人工智能的要求。对相关技术和最先进的应用进行了评估,以强调在行政首长协调会中建立可靠的人工智能应用的重要性。此外,还提供了一个全面的透明度分析案例研究,以加深理解。总之,这部著作以一种首次特别面向化学工程师的方式,对这一主题进行了深入探讨,以提高人们对负责任地使用人工智能的认识。有了这一重要的缺失环节,人工智能有望成为一种新颖而强大的工具,为化学工程师解决化学工程中的瓶颈难题提供巨大帮助。
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引用次数: 0
Chain Elongation Using Native Soil Inocula: Exceptional n-Caproate Biosynthesis Performance and Microbial Mechanisms 利用原生土壤接种菌进行链延伸:特殊的正己酸酯生物合成性能和微生物机制
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2023.10.017

This study demonstrates the feasibility and effectiveness of utilizing native soils as a resource for inocula to produce n-caproate through the chain elongation (CE) platform, offering new insights into anaerobic soil processes. The results reveal that all five of the tested soil types exhibit CE activity when supplied with high concentrations of ethanol and acetate, highlighting the suitability of soil as an ideal source for n-caproate production. Compared with anaerobic sludge and pit mud, the native soil CE system exhibited higher selectivity (60.53%), specificity (82.32%), carbon distribution (60.00%), electron transfer efficiency (165.00%), and conductivity (0.59 ms∙cm−1). Kinetic analysis further confirmed the superiority of soil in terms of a shorter lag time and higher yield. A microbial community analysis indicated a positive correlation between the relative abundances of Pseudomonas, Azotobacter, and Clostridium and n-caproate production. Moreover, metagenomics analysis revealed a higher abundance of functional genes in key microbial species, providing direct insights into the pathways involved in n-caproate formation, including in situ CO2 utilization, ethanol oxidation, fatty acid biosynthesis (FAB), and reverse beta-oxidation (RBO). The numerous functions in FAB and RBO are primarily associated with Pseudomonas, Clostridium, Rhodococcus, Stenotrophomonas, and Geobacter, suggesting that these genera may play roles that are involved or associated with the CE process. Overall, this innovative inoculation strategy offers an efficient microbial source for n-caproate production, underscoring the importance of considering CE activity in anaerobic soil microbial ecology and holding potential for significant economic and environmental benefits through soil consortia exploration.

这项研究证明了利用原生土壤作为接种物资源,通过链延伸(CE)平台生产正己酸酯的可行性和有效性,为了解厌氧土壤过程提供了新的视角。结果表明,当提供高浓度乙醇和乙酸时,所有五种测试土壤类型都表现出 CE 活性,这突出表明土壤适合作为生产正己酸酯的理想来源。与厌氧污泥和坑泥相比,原生土壤 CE 系统表现出更高的选择性(60.53%)、专一性(82.32%)、碳分布(60.00%)、电子传递效率(165.00%)和电导率(0.59 ms∙cm-1)。动力学分析进一步证实了土壤在缩短滞后时间和提高产量方面的优势。微生物群落分析表明,假单胞菌、氮单胞菌和梭状芽孢杆菌的相对丰度与正己酸酯产量呈正相关。此外,元基因组学分析表明,关键微生物物种中的功能基因丰度较高,直接揭示了正己酸酯形成的途径,包括原位二氧化碳利用、乙醇氧化、脂肪酸生物合成(FAB)和反向β-氧化(RBO)。FAB和RBO的众多功能主要与假单胞菌、梭状芽孢杆菌、罗杜球菌、司来诺单胞菌和革囊菌有关,这表明这些菌属可能参与了CE过程或与之相关。总之,这种创新的接种策略为正己酸酯的生产提供了一个高效的微生物源,强调了在厌氧土壤微生物生态学中考虑CE活性的重要性,并通过土壤联合体的探索为巨大的经济和环境效益提供了潜力。
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引用次数: 0
Feasibility of Scaling up the Cost-Competitive and Clean Electrolytic Hydrogen Supply in China 在中国扩大具有成本竞争力的清洁电解氢供应的可行性
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2024.05.014

Scaling up clean hydrogen supply in the near future is critical to achieving China’s hydrogen development target. This study established an electrolytic hydrogen development mechanism considering the generation mix and operation optimization of power systems with access to hydrogen. Based on the incremental cost principle, we quantified the provincial and national clean hydrogen production cost performance levels in 2030. The results indicated that this mechanism could effectively reduce the production cost of clean hydrogen in most provinces, with a national average value of less than 2 USD·kg−1 at the 40-megaton hydrogen supply scale. Provincial cooperation via power transmission lines could further reduce the production cost to 1.72 USD·kg−1. However, performance is affected by the potential distribution of hydrogen demand. From the supply side, competitiveness of the mechanism is limited to clean hydrogen production, while from the demand side, it could help electrolytic hydrogen fulfil a more significant role. This study could provide a solution for the ambitious development of renewables and the hydrogen economy in China.

在不久的将来扩大清洁氢气供应对于实现中国氢能发展目标至关重要。本研究建立了电解制氢的发展机制,考虑了氢气接入电力系统的发电组合和运行优化。基于成本递增原则,我们量化了 2030 年各省和全国清洁制氢的成本绩效水平。结果表明,该机制可有效降低大部分省份的清洁氢气生产成本,在 4000 万吨氢气供应规模下,全国平均值低于 2 美元-kg-1。通过输电线路开展省级合作可进一步将生产成本降至 1.72 美元-千克-1。然而,氢气需求的潜在分布会影响氢气的性能。从供应方来看,该机制的竞争力仅限于清洁制氢,而从需求方来看,它可以帮助电解氢发挥更重要的作用。这项研究可为中国大力发展可再生能源和氢经济提供解决方案。
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引用次数: 0
Machine-Learning-Assisted Design of Deep Eutectic Solvents Based on Uncovered Hydrogen Bond Patterns 基于未发现的氢键模式的机器学习辅助深共晶溶剂设计
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2023.10.020

Non-ionic deep eutectic solvents (DESs) are non-ionic designer solvents with various applications in catalysis, extraction, carbon capture, and pharmaceuticals. However, discovering new DES candidates is challenging due to a lack of efficient tools that accurately predict DES formation. The search for DES relies heavily on intuition or trial-and-error processes, leading to low success rates or missed opportunities. Recognizing that hydrogen bonds (HBs) play a central role in DES formation, we aim to identify HB features that distinguish DES from non-DES systems and use them to develop machine learning (ML) models to discover new DES systems. We first analyze the HB properties of 38 known DES and 111 known non-DES systems using their molecular dynamics (MD) simulation trajectories. The analysis reveals that DES systems have two unique features compared to non-DES systems: The DESs have ① more imbalance between the numbers of the two intra-component HBs and ② more and stronger inter-component HBs. Based on these results, we develop 30 ML models using ten algorithms and three types of HB-based descriptors. The model performance is first benchmarked using the average and minimal receiver operating characteristic (ROC)-area under the curve (AUC) values. We also analyze the importance of individual features in the models, and the results are consistent with the simulation-based statistical analysis. Finally, we validate the models using the experimental data of 34 systems. The extra trees forest model outperforms the other models in the validation, with an ROC-AUC of 0.88. Our work illustrates the importance of HBs in DES formation and shows the potential of ML in discovering new DESs.

非离子深共晶溶剂(DES)是一种非离子设计溶剂,在催化、萃取、碳捕获和制药等领域有多种应用。然而,由于缺乏能准确预测 DES 形成的高效工具,发现新的 DES 候选物质具有挑战性。寻找 DES 在很大程度上依赖于直觉或试错过程,导致成功率低或错失良机。我们认识到氢键(HB)在DES形成过程中发挥着核心作用,因此我们旨在找出区分DES与非DES系统的HB特征,并利用它们开发机器学习(ML)模型,以发现新的DES系统。我们首先利用分子动力学(MD)模拟轨迹分析了38个已知DES系统和111个已知非DES系统的HB特性。分析表明,与非 DES 系统相比,DES 系统有两个独特的特征:DES具有①更多的两个组分内HB数量不平衡,以及②更多和更强的组分间HB。基于这些结果,我们使用十种算法和三种基于 HB 的描述符开发了 30 个 ML 模型。首先使用平均和最小接收者操作特征(ROC)-曲线下面积(AUC)值对模型性能进行了基准测试。我们还分析了模型中各个特征的重要性,结果与基于模拟的统计分析一致。最后,我们利用 34 个系统的实验数据对模型进行了验证。在验证中,额外树木森林模型的 ROC-AUC 值为 0.88,优于其他模型。我们的工作说明了 HB 在 DES 形成过程中的重要性,并展示了 ML 在发现新 DES 方面的潜力。
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引用次数: 0
Waste Cotton-Derived Fiber-Based Thermoelectric Aerogel for Wearable and Self-Powered Temperature–Compression Strain Dual-Parameter Sensing 基于废棉纤维的热电气凝胶,用于可穿戴和自供电的温度压缩应变双参数传感技术
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2024.01.015

The rapid development of the global economy and population growth are accompanied by the production of numerous waste textiles. This leads to a waste of limited resources and serious environmental pollution problems caused by improper disposal. The rational recycling of wasted textiles and their transformation into high-value-added emerging products, such as smart wearable devices, is fascinating. Here, we propose a novel roadmap for turning waste cotton fabrics into three-dimensional elastic fiber-based thermoelectric aerogels by a one-step lyophilization process with decoupled self-powered temperature–compression strain dual-parameter sensing properties. The thermoelectric aerogel exhibits a fast compression response time of 0.2 s, a relatively high Seebeck coefficient of 43 μV·K−1, and an ultralow thermal conductivity of less than 0.04 W·m−1·K−1. The cross-linking of trimethoxy(methyl)silane (MTMS) and cellulose endowed the aerogel with excellent elasticity, allowing it to be used as a compressive strain sensor for guessing games and facial expression recognition. In addition, based on the thermoelectric effect, the aerogel can perform temperature detection and differentiation in self-powered mode with the output thermal voltage as the stimulus signal. Furthermore, the wearable system, prepared by connecting the aerogel-prepared array device with a wireless transmission module, allows for temperature alerts in a mobile phone application without signal interference due to the compressive strains generated during gripping. Hence, our strategy is significant for reducing global environmental pollution and provides a revelatory path for transforming waste textiles into high-value-added smart wearable devices.

全球经济的快速发展和人口的增长伴随着大量废弃纺织品的产生。这不仅造成了有限资源的浪费,还因处置不当造成了严重的环境污染问题。如何合理回收利用废弃纺织品,并将其转化为高附加值的新兴产品,如智能可穿戴设备,是一个令人着迷的问题。在此,我们提出了一种新颖的路线图,通过一步冻干工艺将废弃棉织物转化为三维弹性纤维热电气凝胶,并具有解耦自供电温度-压缩应变双参数传感特性。这种热电气凝胶具有 0.2 秒的快速压缩响应时间、43 μV-K-1 的较高塞贝克系数和小于 0.04 W-m-1-K-1 的超低导热系数。三甲氧基(甲基)硅烷(MTMS)和纤维素的交联赋予了气凝胶极佳的弹性,使其可以用作猜拳游戏和面部表情识别的压缩应变传感器。此外,基于热电效应,气凝胶可以在自供电模式下,以输出的热电压作为刺激信号,进行温度检测和区分。此外,通过将气凝胶制备的阵列装置与无线传输模块相连接,可穿戴系统可在手机应用中发出温度警报,而不会因抓握过程中产生的压缩应变而造成信号干扰。因此,我们的战略对减少全球环境污染意义重大,并为将废弃纺织品转化为高附加值智能可穿戴设备提供了一条启示性路径。
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引用次数: 0
Lunar In Situ Large-Scale Construction: Quantitative Evaluation of Regolith Solidification Techniques 月球原位大规模建造:巨岩凝固技术的定量评估
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2024.03.004

Lunar habitat construction is crucial for successful lunar exploration missions. Due to the limitations of transportation conditions, extensive global research has been conducted on lunar in situ material processing techniques in recent years. The aim of this paper is to provide a comprehensive review, precise classification, and quantitative evaluation of these approaches, focusing specifically on four main approaches: reaction solidification (RS), sintering/melting (SM), bonding solidification (BS), and confinement formation (CF). Eight key indicators have been identified for the construction of low-cost and high-performance systems to assess the feasibility of these methods: in situ material ratio, curing temperature, curing time, implementation conditions, compressive strength, tensile strength, curing dimensions, and environmental adaptability. The scoring thresholds are determined by comparing the construction requirements with the actual capabilities. Among the evaluated methods, regolith bagging has emerged as a promising option due to its high in situ material ratio, low time requirement, lack of high-temperature requirements, and minimal shortcomings, with only the compressive strength falling below the neutral score. The compressive strength still maintains a value of 2–3 MPa. The proposed construction scheme utilizing regolith bags offers numerous advantages, including rapid and large-scale construction, ensured tensile strength, and reduced reliance on equipment and energy. In this study, guidelines for evaluating regolith solidification techniques are provided, and directions for improvement are offered. The proposed lunar habitat design based on regolith bags is a practical reference for future research.

月球栖息地的建造对于月球探测任务的成功至关重要。由于运输条件的限制,近年来全球对月球原位材料加工技术进行了广泛的研究。本文旨在对这些方法进行全面综述、精确分类和定量评估,特别关注四种主要方法:反应凝固(RS)、烧结/熔融(SM)、粘结凝固(BS)和约束形成(CF)。为评估这些方法的可行性,确定了建造低成本高性能系统的八个关键指标:原位材料比、固化温度、固化时间、实施条件、抗压强度、抗拉强度、固化尺寸和环境适应性。通过比较施工要求和实际能力来确定评分阈值。在所评估的方法中,雷公石袋装法因其就地材料比率高、时间要求低、无高温要求、缺点极少(仅抗压强度低于中性分数)而成为一种有前途的选择。抗压强度仍保持在 2-3 兆帕之间。所提出的利用雷公石袋的施工方案具有许多优点,包括施工速度快、规模大、抗拉强度有保证、减少对设备和能源的依赖。本研究提供了评价摄岩石固化技术的指导原则,并提出了改进方向。提出的基于摄岩石袋的月球栖息地设计方案为今后的研究提供了实用参考。
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引用次数: 0
Space Rocks—and Dust—Roll into Planetary Science Limelight 太空岩石和尘埃成为行星科学的焦点
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2024.07.005
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引用次数: 0
Large-Scale Preparation of Mechanically High-Performance and Biodegradable PLA/PHBV Melt-Blown Nonwovens with Nanofibers 大规模制备机械性能高、可生物降解的聚乳酸/PHBV 熔喷纳米无纺布
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2023.02.021

Biodegradable polylactic acid (PLA) melt-blown nonwovens are attractive candidates to replace non-degradable polypropylene melt-blown nonwovens. However, it is still an extremely challenging task to prepare PLA melt-blown nonwovens with sufficient mechanical properties for practical application. Herein, we report a simple strategy for the large-scale preparation of biodegradable PLA/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) melt-blown nonwovens with high strength and excellent toughness. In this process, a small amount of PHBV is added to PLA to improve the latter’s crystallization rate and crystallinity. In addition, when the PHBV content increases from 0 to 7.5 wt%, the diameters of the PLA/PHBV melt-blown fibers decrease significantly (with the proportion of nanofibers increasing from 7.7% to 42.9%). The resultant PLA/PHBV (5 wt% PHBV) melt-blown nonwovens exhibit the highest mechanical properties. The tensile stress, elongation, and toughness of PLA/PHBV (5 wt% PHBV) melt-blown nonwovens reach 2.5 MPa, 45%, and 1.0 MJ·m−3, respectively. More importantly, PLA/PHBV melt-blown nonwovens can be completely degraded into carbon dioxide and water after four months in the soil, making them environmentally friendly. A general tensile-failure model of melt-blown nonwovens is proposed in this study, which may shed light on mechanical performance enhancement for nonwovens.

可生物降解的聚乳酸(PLA)熔喷无纺布是替代不可降解的聚丙烯熔喷无纺布的极具吸引力的候选材料。然而,要制备出具有足够机械性能的聚乳酸熔喷非织造布以供实际应用,仍是一项极具挑战性的任务。在此,我们报告了一种大规模制备具有高强度和优异韧性的可生物降解聚乳酸/聚(3-羟基丁酸-3-羟基戊酸)(PHBV)熔喷非织造布的简单策略。在该工艺中,聚乳酸中加入少量 PHBV,以提高后者的结晶速度和结晶度。此外,当 PHBV 含量从 0 增加到 7.5 wt% 时,聚乳酸/PHBV 熔喷纤维的直径会明显减小(纳米纤维的+比例从 7.7% 增加到 42.9%)。由此得到的聚乳酸/PHBV(5 wt% PHBV)熔喷无纺布具有最高的机械性能。聚乳酸/PHBV(5 wt% PHBV)熔喷非织造布的拉伸应力、伸长率和韧性分别达到 2.5 MPa、45% 和 1.0 MJ-m-3。更重要的是,聚乳酸/PHBV 熔喷无纺布在土壤中放置 4 个月后可完全降解为二氧化碳和水,因此非常环保。本研究提出了熔喷非织造布的一般拉伸失效模型,可为非织造布机械性能的提高提供启示。
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引用次数: 0
Theoretical Framework for a Polymorphic Network Environment 多态网络环境的理论框架
IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2024-08-01 DOI: 10.1016/j.eng.2024.01.018

The question of whether an ideal network exists with global scalability in its full life cycle has always been a first-principles problem in the research of network systems and architectures. Thus far, it has not been possible to scientifically practice the design criteria of an ideal network in a unimorphic network system, making it difficult to adapt to known services with clear application scenarios while supporting the ever-growing future services with unexpected characteristics. Here, we theoretically prove that no unimorphic network system can simultaneously meet the scalability requirement in a full cycle in three dimensions—the service-level agreement (S), multiplexity (M), and variousness (V)—which we name as the “impossible SMV triangle” dilemma. It is only by transforming the current network development paradigm that the contradiction between global scalability and a unified network infrastructure can be resolved from the perspectives of thinking, methodology, and practice norms. In this paper, we propose a theoretical framework called the polymorphic network environment (PNE), the first principle of which is to separate or decouple application network systems from the infrastructure environment and, under the given resource conditions, use core technologies such as the elementization of network baselines, the dynamic aggregation of resources, and collaborative software and hardware arrangements to generate the capability of the “network of networks.” This makes it possible to construct an ideal network system that is designed for change and capable of symbiosis and coexistence with the generative network morpha in the spatiotemporal dimensions. An environment test for principle verification shows that the generated representative application network modalities can not only coexist without mutual influence but also independently match well-defined multimedia services or custom services under the constraints of technical and economic indicators.

理想网络在其整个生命周期内是否具有全局可扩展性,一直是网络系统和架构研究中的第一性原理问题。迄今为止,我们还无法在非形态网络系统中科学地实践理想网络的设计标准,这使得它既难以适应应用场景明确的已知服务,又难以支持未来不断增长的、具有意想不到特性的服务。在此,我们从理论上证明,任何非形态网络系统都无法同时满足服务等级协议(S)、复用性(M)和多样性(V)三个维度的全周期可扩展性要求,我们将其命名为 "不可能的 SMV 三角 "困境。只有转变当前的网络发展范式,才能从思维、方法和实践规范等方面解决全球可扩展性与统一网络基础设施之间的矛盾。本文提出了多形态网络环境(PNE)的理论框架,其首要原则是将应用网络系统与基础设施环境分离或解耦,在给定的资源条件下,利用网络基线元素化、资源动态聚合、软硬件协同编排等核心技术,生成 "网络的网络 "的能力。这就有可能构建一个理想的网络系统,该系统的设计是为了适应变化,并能在时空维度上与生成网络形态共生共存。一个用于原理验证的环境测试表明,生成的代表性应用网络模式不仅可以共存而互不影响,而且可以在技术和经济指标的限制下独立匹配定义明确的多媒体服务或定制服务。
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