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Status and prospects for symmetric organic redox flow batteries

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journal of Energy chemistry 2025年第1期100卷 125-143页

作者： Md Al Raihan c.Adam Dyker Department of chemistry University of New Brunswick

As environmental concerns from fossil fuel consumption intensify, large-scale energy storage becomes imperative for the integration of renewable sources like wind, hydro, and solar with the electrical *** flow batteries, particularly those employing organic molecules, are positioned as a key technology for this purpose. This review explores the growing field of symmetric organic redox flow batteries(ORFBs) within this context. Unlike traditional asymmetric designs based on unique active materials for each electrode, symmetric ORFBs involve a single bipolar species for both electrodes. This review highlights the benefits of a symmetric design, and categorizes five distinct classes of organic bipolar molecules used in both aqueous and non-aqueous solvents. By providing a comprehensive overview of their cell cycling and performance characteristics, the strengths and weaknesses of the diverse categories of bipolar molecules are highlighted for both solvent systems, as are opportunities for future development. This should guide new research directions and advance the development of practical symmetric ORFBs.

关键词： Redox flow battery Symmetric battery Organic battery Aqueous electrolyte Non-aqueous electrolyte

A functional tacrolimus-releasing nerve wrap for enhancing nerve regeneration following surgical nerve repair

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Neural Regeneration Research 2025年第1期20卷 291-304页

作者： Simeon c.Daeschler Katelyn j.W.So Konstantin Feinberg Marina Manoraj jenny cheung jennifer Zhang Kaveh Mirmoeini jPaul Santerre Tessa Gordon Gregory HBorschel SickKids Research Institute Neuroscience and Mental Health ProgramTorontoONCanada Institute of Biomaterials and Biomedical Engineering University of TorontoTorontoONCanada Indiana University School of Medicine IndianapolisINUSA Division of Plastic and Reconstructive Surgery the Hospital for Sick ChildrenTorontoONCanada Translational Biology and Engineering Program Ted Rogers Centre for Heart ResearchInstitute of Biomedical EngineeringFaculty of DentistryUniversity of TorontoTorontoONCanada

Axonal regeneration following surgical nerve repair is slow and often incomplete,resulting in poor functional recovery which sometimes contributes to lifelong ***,there are no FDA-approved therapies available to promote nerve *** accelerates axonal regeneration,but systemic side effects presently outweigh its potential benefits for peripheral nerve *** authors describe herein a biodegradable polyurethane-based drug delivery system for the sustained local release of tacrolimus at the nerve repair site,with suitable properties for scalable production and clinical application,aiming to promote nerve regeneration and functional recovery with minimal systemic drug *** is encapsulated into co-axially electrospun polycarbonate-urethane nanofibers to generate an implantable nerve wrap that releases therapeutic doses of bioactive tacrolimus over 31 *** and drug loading are adjustable for applications in small and large caliber nerves,and the wrap degrades within 120 days into biocompatible *** released from the nerve wrap promotes axon elongation in vitro and accelerates nerve regeneration and functional recovery in preclinical nerve repair models while off-target systemic drug exposure is reduced by 80%compared with systemic *** its surgical suitability and preclinical efficacy and safety,this system may provide a readily translatable approach to support axonal regeneration and recovery in patients undergoing nerve surgery.

关键词： biodegradable local drug delivery nerve injury nerve regeneration nerve wrap tacrolimus

超前钻孔直径对高应力巷道卸压及掏槽爆破效果影响研究

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华北理工大学学报（自然科学版） 2025年第1期47卷 53-61页

作者：黄斌胡学龙安徽理工大学安徽省煤矿安全采掘装备制造业创新中心安徽淮南232001 中国矿业大学煤炭精细勘探与智能开发全国重点实验室江苏徐州221116 安徽理工大学矿业工程学院安徽淮南232001

随着煤炭开采逐步向深部推进,巷道开挖过程中应力集中问题日益突显,亟需有效解决。本文采用Ansys/Ls-Dyna数值模拟软件,针对高应力环境下不同超前钻孔直径对巷道卸压效果及掏槽爆破效果的影响进行了系统研究。利用Imagej图像处理软件对... 详细信息

随着煤炭开采逐步向深部推进,巷道开挖过程中应力集中问题日益突显,亟需有效解决。本文采用Ansys/Ls-Dyna数值模拟软件,针对高应力环境下不同超前钻孔直径对巷道卸压效果及掏槽爆破效果的影响进行了系统研究。利用Imagej图像处理软件对巷道掏槽爆破损伤云图进行了详细分析。结果表明,随着超前钻孔直径的增加,钻孔孔底至岩石内部区域的有效应力逐渐降低,有效实现了卸压作用;随着超前钻孔直径的增大,掏槽爆破岩石块度逐渐减少,小块度占比显著增加,且在大直径钻孔爆破中岩石块度的分布更为均匀。研究成果对提升高应力巷道掏槽爆破效果具有重要指导意义。

关键词：高应力超前钻孔掏槽爆破数值模拟

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Long range electromagnetic field nature of nerve signal propagation in myelinated axons

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chinese Physics B 2022年第3期31卷 619-623页

作者： Qing-Wei Zhai Kelvin j A Ooi Sheng-Yong Xu c K ong School of Electrical and computer Engineering Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia Department of Physics Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia Department of Electronics School of Electronics Engineering and Computer SciencePeking UniversiyBeijing 100871China Department of Physics National University of Singapore2 Science Drive 3117551 Singapore

The nature of saltatory conduction in myelinated axon described by equivalent circuit and circuit theory is still contentious. Recent experimental observations of action potentials transmitting through disjointed nerve fibers strongly suggest an electromagnetic wave propagation mechanism of the nerve signals. In this paper, we employ the electromagnetic wave model of the myelinated axon to describe action potential signal propagation. We use the experimental frequency-dependent conductivity and permittivity values of the nerve tissues in order to reliably calculate the electromagnetic modes by using electromagnetic mode solvers. We find that the electromagnetic waves above 10 kHz can be well confined in extracellular fluid–myelin sheath–intracellular fluid waveguide and propagate a distance of 7 mm without much attenuation. Our study may serve as one of the fundamental researches for the better understanding of the nervous system.

关键词： action potential propagation and axons neuronal wave propagation neuroscience electrodynamics in the nervous system

calcium Phosphate coating over Silk Fibroin Film by Biomimetic Methods

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journal of Wuhan University of Technology(Materials Science) 2005年第B12期20卷 92-94页

作者：赵勇陈治清 ong j West china college of Stomatology Sichuan University Chengdu 610041 China Department of Biomedical Engineering and Orthopedic Surgery University of Tennessee Health Science Center Memphis 38163USA

To investigate the biomincralization behavior of silk fibroin and to valuate the biodegradation and biocompatibility of the hybrid biomaterial, the calcium phosphate deposits were identified with SEM, EDX, XRD and FTIR. The results reveal that supersaturated calcification solution is an effective method for the mineralization of fibroin film. Enzymatic degradation experiment demonstrates the biodegradability of the composites. Osteoblasts incubation shows an excellent cytocompatibility on the mincralized fibroin films.

关键词： biomineralization degradation apatite fibroin/HAP composite

cFD investigation of the feasibility of polymer-based microchannel heat sink as thermal solution

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chinese journal of chemical Engineering 2020年第4期28卷 980-994页

作者： Yue Seong ong KuZilati KuShaari Department of chemical Engineering University Teknologi PETRONASSeri IskandarMalaysia

Microchannel heat sinks(McHSs)are promising thermal solutions in miniaturized or compact *** aspect has been given huge emphasis in recent ***-based materials are commonly used to fabricate McHSs due to their high thermal ***,McHSs are heavy due to the high density of these materials albeit the small footprint of ***-based materials are interesting *** their poor thermal conductivity,lightweight feature attracts the interest of *** transfer is a conjugate process of heat conduction and heat *** heat conductions aspect may be compensated through enhancement of heat convection *** polymer-based materials have been used in microscale heat transfer studies,their focus was not on their *** present study aims to evaluate the feasibility of polymer-based McHSs as thermal *** effect of thermal conductivity of fabrication materials,including polymer-based PDMS,PTFE,PDMS/MWcNT,and metal-based aluminum,on the thermal performance of McHSs was investigated and compared at various inlet flow rate,fluid thermal conductivity,and microchannel ratio at different constant heat fluxes using three-dimensional cFD *** showed that the thermal performance of McHSs was greatly affected by the heat conduction aspect in which poor heat conduction limited the thermal performance improvement due to enhanced heat convection *** suggests polymer-based materials have the potential for heat transfer applications through thermal conductivity *** was confirmed in the further analysis using a recently proposed high thermal conductivity polymer-based graphite/epoxy McHS and a hybrid-based PDMS/aluminum McHS.

关键词： Microchannel heat sink Thermal performance Thermal conductivity Microchannel ratio computational fluid dynamic

Intestinal stem cells and the colorectal cancer microenvironment

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World journal of Gastroenterology 2014年第8期20卷 1898-1909页

作者： Bryan A ong Kenneth j Vega courtney W Houchen Department of Digestive Diseases University of Oklahoma Health Sciences CenterOklahoma CityOK 73104United States

colorectal cancer (cRc) remains a highly fatal condition in part due to its resilience to treatment and its propensity to spread beyond the site of primary occurrence. One possible avenue for cancer to escape eradication is via stem-like cancer cells that, through phenotypic heterogeneity, are more resilient than other tumor constituents and are key contributors to cancer growth and metastasis. These proliferative tumor cells are theorized to possess many properties akin to normal intestinal stem cells. Not only do these cRc “stem” cells demonstrate similar restorative ability, they also share many cell pathways and surface markers in common, as well as respond to the same key niche stimuli. With the improvement of techniques for epithelial stem cell identification, our understanding of cRc behavior is also evolving. Emerging evidence about cellular plasticity and epithelial mesenchymal transition are shedding light onto metastatic cRc processes and are also challenging fundamental concepts about unidirectional epithelial proliferation. This review aims to reappraise evidence supporting the existence and behavior of cRc stem cells, their relationship to normal stem cells, and their possible dependence on the stem cell niche.

关键词： colon cancer stem cells DcLK1 protein Stem cell niche cell dedifferentiation

Trophic Ecology of Ansonia latidisca at Gunung Penrissen, Sarawak, North-Western Borneo

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Asian Herpetological Research 2021年第2期12卷 250-260页

作者： jia jet ong Indraneil DAS Institute of Biodiversity ami Environmental conservation Universiti Malaysia SarawakKota Samamhan 94300SaniwakMalaysiii

Dietary data on Ansonia latidisca, the little known Bornean Rainbow Toad, are presented, through an investigation of a population at Gunung Penrissen, Sarawak, Malaysia(north-western Borneo), at elevations between 1,100–1,229 m asl. Standard sampling techniques, including visual encounter surveys, were employed and individuals encountered stomach-flushed, ma rked, a nd released. The volume of food ingested by adults, apart from large females, did not vary monthly, and there was no significant difference between wet and dry periods, the dominance index between the two periods showing no significant difference, indicating that seasonal variation does not affect the dietary constitution of the species across months. The mean longest prey was recovered from a female in march, during the end of the wet season. Larger individuals did not consume larger prey in the species, although larger females did harvest the largest insects, and as may be expected, had fewer prey items in their stomachs at the time. Males fed on fewer prey items than females, the adult male diet predominantly comprised of members of the Hymenoptera, including formicids(ants), as indicated by percentage frequency of occurrence of 78.69, while for adult females, equivalent figure was 90.70. coleopterans(beetles) were found secondary in importance(48.8% in females, 5.85% in males), the rest categorized as tertiary. Plant items(including bryophytes) had a high frequency of occurrence(23.3% in females, 4.64% in males). Females examined in the month of july had voluminous stomach contents, and may have eaten more to increase fat reserves for breeding in the upcoming wet season. Since the diet of all size classes consisted of hymenopterans(ants) and coleopterans, the study species is here considered to have a narrow food preference, and consequently, is a dietary specialist.

关键词： Ansonia latidisca Borneo diet ecology Malaysia Sarawak

Simultaneous intermetallics suppression and residual-stress relaxation of heat-resistant Nb-interlayer-inserted Ti-6Al-4V/Si_(3)N_(4)joints via one-step transient liquid phase bonding and brazing

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journal of Materials Science & Technology 2023年第8期139卷 79-91页

作者： Fei Shen ong Hirobumi Tobe Eiichi Sato Institute of Space and Astronautical Science Japan Aerospace Exploration Agency3-1-1 YoshinodaiChuoSagamihara 252-5210Japan Department of Materials Engineering Graduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyoTokyo 113-8656Japan

This work has successfully proposed a solution to produce robust Nb-interlayer-inserted Ti-6Al-4V/Si_(3)N_(4)joints optimized for a maximum operating temperature of 873 K;transient liquid phase bonding(TLPB)of Ti-6Al-4V/Nb side was carried out with cu and Ni fillers to suppress brittle intermetallic compounds(IMcs),whereas brazing of Nb/Si_(3)N_(4)side was performed using a highly ductile Ti-added Ag-rich filler for effective residual-stress relaxation.A sound yet simple one-step bonding process incorporating simul-taneous TLPB and brazing was achieved with a relatively short holding time of 10 min at 1213 *** of Ti-6Al-4V/Nb side with cu and Ni foils of 2-μm-thick each as a laminated filler suppressed brittle Ti-based IMcs and developed a homogenized microstructure consisting mainly of(α+β)-Ti via isothermal ***,brazing of Nb/Si_(3)N_(4)side with 100-μm-thick SILVER-ABA filler(92.75Ag-5cu-1Al-1.25Ti mass%)foil enhanced interfacial bonding with sufficient total Ti content and accommodated residual stress better than conventional eutectic Ag-cu-based fillers,and it was verified by finite element analysis with consideration of materials’temperature-dependent elasto-plastic *** joints with a bonding area of 10 mm×10 mm were tested via symmetrical four-point bending from room temper-ature(RT)to 873 K fractured from Nb/Si_(3)N_(4)*** re-heating the joints from RT to 673 K,frac-ture initiation gradually shifted from Si_(3)N_(4)towards interfacial-compounds/Si_(3)N_(4)interface and bending strengths maintained∼220 MPa as weakening of SILVER-ABA filler was compensated by residual-stress relaxation in Si_(3)N_(4).When tested at 873 K,joints fractured mainly across the Ag-rich solid solution in a ductile manner and bending strength degraded by∼20%to 171 MPa as weakening of SILVER-ABA filler dominated.

关键词： Transient liquid phase bonding Brazing ceramics Residual stress Finite element analysis