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Composites recycling solutions for the aviation industry

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Science China(Technological Sciences) 2017年第9期60卷 1291-1300页

作者： WONG Kok rudd chris PICKERING Steve LIU XiaoLing Ningbo Nottingham International Academy for the Marine Economy and Technology University of Nottingham Ningbo China Ningbo 315100 China Ningbo Nottingham New Materials Institute University of Nottingham Ningbo China Ningbo 315100 China division of Materials Mechanics and Structures Faculty of Engineering University of Nottingham Nottingham UK

Ten of thousands of aircraft are expected to retire in the next 20 *** manufacturers are gearing up for a new wave of recycling challenges as these aircrafts contain significant higher amount of carbon fibre reinforced polymer composite,which cannot be recycled by the conventional processes designed for metallic *** manufacturers have been working with the recycling industry to limit unsustainable dismantling that is harmful to the environment and the potential liability risk of re-entry of un-certified salvaged parts back to the aviation *** organised recycling network and procedures have already been set up for the conventional metallic alloys and will soon be required to include the composite *** paper reports the existing aircraft recycling practice and reviews the key recycling technologies for thermoset *** consumptions of these technologies are sought from the literature and are reported in this *** in development of reuse options for the recycled fibre is also included with discussion of their advantages and *** challenge of working with the fluffy fibre is considered and the benefit of fibre alignment is highlighted for encouraging a widespread use of the fibre.

关键词： composite recycling carbon fibre aviation

Burden sharing for CdR: balancing fair liability with feasibility

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National Science Review 2023年第12期10卷 47-48页

作者： chris d.Jones Met Office Hadley Centre

The basics are clear:climate is changing,it is caused by human activity and it is affecting everyone and everywhere now[1]. The good news is that we know what to do about it—we can stop global temperatures rising further if we stop emitting greenhouse gases. But because some sectors (such as agriculture or aviation)will have ongoing ‘hard-to-abate’ emissions,

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典型结构功能一体化复合材料的设计与制备技术

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复合材料学报 2024年第9期41卷 4457-4477页

作者：蒋民强胡东源董晨昊 PIERCE Robert rudd chris 刘晓玲益小苏宁波诺丁汉大学理工学院宁波315100 长三角碳纤维及复合材料技术创新中心常州213126 丹麦技术大学风力与能源系统学院科恩斯林比2800

在碳纤维增强树脂基复合材料轻量化与结构性能持续提高的前提下,同时附加其特定的功能,尤其是在不损失、甚至提升其层间断裂韧性的情况下,不仅可以弥补结构复合材料天然的缺陷,例如树脂基体的电绝缘性,也可以使其满足特定产品的要求,例... 详细信息

在碳纤维增强树脂基复合材料轻量化与结构性能持续提高的前提下,同时附加其特定的功能,尤其是在不损失、甚至提升其层间断裂韧性的情况下,不仅可以弥补结构复合材料天然的缺陷,例如树脂基体的电绝缘性,也可以使其满足特定产品的要求,例如高刚度兼具一定的吸声降噪特性等。显然,对于航空航天这样的尖端应用领域,这种功能附加或结构功能一体化的复合材料技术对航空航天技术的未来发展至关重要。本文介绍了4种具有典型性的结构功能一体化复合材料的设计、制备与性能研究,分别是基于层间功能化插层和基于内织导电纬纱的导电增韧一体化复合材料及多级孔碳化棉纤维填充蜂窝/微穿孔面板的夹芯复合材料结构和编织布/无纺纤维毡复合材料片材折叠成型的结构吸声一体化复合材料。前两种材料分别通过在复合材料富树脂的层间插入导电功能化插层和在复合材料内引入贯通整个材料的导电纬纱网络实现了复合材料的导电性能与层间韧性的同步提高,而后两种材料则分别通过多级孔结构的碳化棉纤维材料填充蜂窝/微穿孔面板夹芯技术和编织布/无纺纤维毡复合材料片材的折叠技术实现了良好的吸声性能等,以展示多尺度、多层次结构设计和制备技术在结构复合材料功能化集成和结构功能一体化方面的应用。

关键词：碳纤维增强复合材料多功能复合材料导电增韧吸声

Interpretation of tangential and radial pressure cells in and on sprayed concrete tunnel linings

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Underground Space 2021年第5期6卷 516-527页

作者： Benoit d.Jones chris R.I.Clayton Inbye Engineering Limited Coventry CV12NPUK department of Engineering University of SouthamptonSouthampton SO171BJUK

It is important to be able to measure stresses in tunnel linings to verify design assumptions and validate numerical *** sprayed concrete-lined tunnels,continuous monitoring of stresses from the time of spraying onwards is desirable,and this can only be achieved using pressure cells installed on and in the sprayed concrete *** there has been some success in using radial pressure cells between the ground and the lining,a method for obtaining reliable absolute values of stress from tangential pressure cells embedded in the sprayed concrete has not been *** paper describes numerical and experimental studies of the behavior of pressure cells for monitoring stresses in a sprayed concrete lining and describes an original methodology to achieve reliable *** particular,data from tangential pressure cells require careful interpretation,as they are sensitive to temperature,and this temperature sensitivity is found in parametric numerical analyses to vary as the stiffness of the concrete and its coefficient of thermal expansion evolve at early *** pressure cells are also sensitive to shrinkage strains in the concrete,and a methodology for removing this effect is *** the approach described in this paper,it is now possible to use pressure cells to measure absolute values of stresses in and on sprayed concrete tunnel linings from early age into the *** example of radial and tangential pressure cells installed in the Heathrow Terminal 4 concourse tunnel is used to illustrate the methodology.

关键词： Lining stresses Sprayed concrete Shotcrete Monitoring Pressure cells

differential variable speed limits to improve performance and safety of car-truck mixed traffic on freeways

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第6期9卷 1003-1016页

作者： Anas Abdulghani chris Lee department of Civil and Environmental Engineering University of WindsorWindsorON N9B 3P4Canada

This study develops a differential variable speed limit(dVSL)which assigns different speed limits for car and truck,and varies speed limits based on traffic *** proposed dVSL algorithm changes speed limits in real time based on truck percentage and occupancy immediately upstream of the ramp and the average speed of the control road sections upstream of the *** algorithm also considers spatial coordination of speeds,which gradually changes the speed limits in successive road sections upstream of the ramp when the severe congestion *** study tested the impacts of dVSL and three other speed limit strategies on delay and safety for a section of the Gardiner Expressway in Toronto,Canada using the VISSIM traffic simulation *** other strategies are 1)uniform speed limit(USL),2)differential speed limit for car and truck(dSL),and 3)USL&dSL(U&d)-i.e.,USL at low truck percentage and dSL at high truck *** was found that dVSL showed the lowest delays for both car and truck among the four *** is mainly because dVSL increased the spacing between vehicles in the right lane upstream of the on-ramp and facilitated vehicles’merging into the mainline *** was also found that dVSL showed the lowest likelihood of rear-end crash between the lead and following vehicles among the four *** study demonstrates that the proposed dVSL algorithm can better control car and truck speeds to reduce delay and improve safety of car-truck mixed traffic flow on freeways.

关键词： Variable speed limit differential speed limit Truck Traffic performance Safety Freeway

Verification of the 2019 GloSea5 Seasonal Tropical Cyclone Landfall Forecast for East China

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Journal of Meteorological Research 2020年第5期34卷 917-925页

作者： Joanne CAMP Philip E.BETT Nicola GOLdING chris d.HEWITT Timothy d.MITCHELL Adam A.SCAIFE Met Office Hadley Centre Exeter EX 13PBUK University of Southern Queensland Toowoomba QLD 4350Australia College of Engineering Mathematics and Physical SciencesUniversity of ExeterDevon EX44QFUK

A prototype climate service was developed and trialled in early 2019 to provide seasonal forecast of the June–July–August(JJA) tropical cyclone(TC) landfall risk for the East China region ahead of the forthcoming typhoon *** forecasts were produced in both March and April 2019 and a final forecast was released to the China Meteorological Administration(CMA) on 1 May 2019. The trial service was produced by using the Met Office Global Seasonal forecast system(GloSea5), and a forecast of the western Pacific subtropical high(WPSH) index was used to infer the TC landfall risk based on a simple linear regression between historical model WPSH indices and observed TC landfalls in East China. The forecast method shows significant skill for forecasting the JJA TC landfall risk in East China with up to three-month lead time, with the greatest skill for predictions initialized in May. The 2019 forecast provided good guidance of the near-average TC activity observed in East China in JJA 2019. Success of the forecast adds confidence to an improved climate service ahead of the 2020 typhoon season.

关键词： seasonal forecasting typhoons tropical cyclones(TCs) landfall risk East China western Pacific subtropical high(WPSH)

Laparoscopic liver resection for colorectal liver metastases—shortand long-term outcomes:A systematic review

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World Journal of Gastrointestinal Oncology 2021年第7期13卷 732-757页

作者： Emily Taillieu Celine de Meyere Frederiek Nuytens chris Verslype Mathieu d'Hondt department of digestive and Hepatobiliary/Pancreatic Surgery AZ GroeningeKortrijk 8500Belgium department of Gastroenterology and Hepatology KU LeuvenLeuven 3000Belgium

BACKGROUNd For well-selected patients and procedures,laparoscopic liver resection(LLR)has become the gold standard for the treatment of colorectal liver metastases(CRLM)when performed in specialized ***,little is currently known concerning patient-related and peri-operative factors that could play a role in survival outcomes associated with LLR for *** To provide an extensive summary of reported outcomes and prognostic factors associated with LLR for *** A systematic search was performed in PubMed,EMBASE,Web of Science and the Cochrane Library using the keywords“colorectal liver metastases”,“laparoscopy”,“liver resection”,“prognostic factors”,“outcomes”and“survival”.Only publications written in English and published until december 2019 were ***,abstracts of which no accompanying full text was published,reviews,case reports,letters,protocols,comments,surveys and animal studies were *** search results were saved to Endnote Online and imported in Rayyan for systematic *** of interest were extracted from the included publications and tabulated for qualitative *** Out of 1064 articles retrieved by means of a systematic and grey literature search,77 were included for qualitative ***-two research papers provided data concerning outcomes of LLR for *** papers were eligible for extraction of data concerning prognostic factors affecting survival *** analysis of the collected data showed that LLR for CRLM is safe,feasible and provides oncological *** research groups have reported on the short-term advantages of LLR compared to open *** obtained results accounted for minor LLR,as well as major LLR,simultaneous laparoscopic colorectal and liver resection,LLR of posterosuperior segments,twostage hepatectomy and repeat LLR for *** research groups so far have studied prognostic factors affecting long-term outcomes of LLR for ***

关键词： Laparoscopic liver resection Colorectal liver metastases Outcomes Prognostic factors Systematic review

Midventricular Takotsubo syndrome

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Journal of Geriatric Cardiology 2020年第5期17卷 303-304页

作者： Konstantinos C Theodoropoulos Ioannis Felekos chris Abell Nicholas d Palmer Turab Ali department of Cardiology Liverpool Heart and Chest Hospital NHS Foundation TrustLiverpoolUK

A 78-year-old woman with a background of type 2 diabetes mellitus,hyperlipidaemia and hypertension experienced sudden onset severe chest pain while in the emergency department,after a stressful emotional *** pain last... 详细信息

关键词： Left ventriculography Midventricular Takotsubo syndrome

Converting antimicrobial into targeting peptides reveals key features governing protein import into mitochondria and chloroplasts

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Plant Communications 2023年第4期4卷 99-116页

作者： Oliver d.Caspari Clotilde Garrido chris OLaw Yves Choquet Francis-Andre´Wollman Ingrid Lafontaine UMR7141(CNRS/Sorbonne Universite´) Institut de Biologie Physico-Chimique13 Rue Pierre et Marie Curie75005 ParisFrance Centre for Microscopy and Cellular Imaging Biology Department Loyola Campus of Concordia University7141 Sherbrooke W.Montre´alQC H4B 1R6Canada Present address:department of Microbiology Institut Pasteur28 Rue Docteur Roux75015 ParisFrance Present address:UMR7238(CNRS/Sorbonne Universite´) Institut de Biologie Paris-SeineSorbonne Jussieu 7-9 quai Saint Bernard75005 ParisFrance

We asked what peptide features govern targeting to the mitochondria versus the chloroplast,using antimicrobial peptides as a starting *** approach was inspired by the endosymbiotic hypothesis that organelle-targeting peptides derive from antimicrobial amphipathic peptides delivered by the host cell,to which organelle progenitors became *** explore the molecular changes required to convert antimicrobial into targeting peptides,we expressed a set of 13 antimicrobial peptides in Chlamydomonas *** were systematically modified to test distinctive features of mitochondrion-and chloroplast-targeting peptides,and we assessed their targeting potential by following the intracellular localization and maturation of a Venus fluorescent reporter used as a cargo *** targeting can be achieved by some unmodified antimicrobial peptide *** to both organelles is improved by replacing lysines with *** targeting is enabled by the presence of flanking unstructured sequences,additional constraints consistent with chloroplast endosymbiosis having occurred in a cell that already contained *** indeed targeting peptides evolved from antimicrobial peptides,then required modifications imply a temporal evolutionary scenario with an early exchange of cationic residues and a late acquisition of chloroplast-specific motifs.

关键词： antimicrobial peptide Chlamydomonas reinhardtii endosymbiotic organellogenesis presequence targeting peptide transit peptide