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Effect of non-uniform swelling on coal multiphysics during gas injection: The triangle approach

Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1362-1372页

作者： Yifan Huang Jishan Liu Yaoyao Zhao Derek Elsworth yee-kwong leong Department of Chemical Engineering School of EngineeringThe University of Western Australia35 Stirling HighwayWA 6009Australia State Key Laboratory of Coal Resources & Safe Mining China University of Mining& TechnologyBeijing100803China Department of Energy and Mineral Engineering G3 Centre and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA16802USA

In current dual porosity/permeability models,there exists a fundamental assumption that the adsorption-induced swelling is distributed uniformly within the representative elementary volume (REV),irrespective of its internal structures and transient ***,both internal structures and transient processes can lead to the non-uniform *** this study,we hypothesize that the non-uniform swelling is responsible for why coal permeability in experimental measurements is not only controlled by the effective stress but also is affected by the adsorption-induced *** propose a concept of the swelling triangle composed of swelling paths to characterize the evolution of the non-uniform swelling and serve as a core link in coupled multiphysics.A swelling path is determined by a dimensionless volumetric ratio and a dimensionless swelling *** swelling paths have the same start and end point,and each swelling path represents a unique swelling *** swelling path as the diagonal of the triangle represents the case of the uniform swelling while that as the two perpendicular boundaries represents the case of the localized *** paths of all intermediate cases populate inside the *** corresponding relations between the swelling path and the response of coal multiphysics are established by a non-uniform swelling *** define this method as the triangle approach and corresponding models as swelling path-based *** proposed concept and models are verified against a long-term experimental measurement of permeability and strains under constant effective *** results demonstrate that during gas injection,coal multiphysics responses have a close dependence on the swelling path,and that in both future experiments and field predictions,this dependence must be considered.

关键词： Transient process Heterogeneity Swelling triangle Swelling path Non-uniform swelling coefficient

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CNT toughened aluminium and CFRP interface for strong adhesive bonding

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Nano Materials Science 2022年第3期4卷 266-275页

作者： Gang Han Bo Tan Fei Cheng Binhua Wang yee-kwong leong Xiaozhi Hu Department of Mechanical Engineering University of Western AustraliaPerthWA6009Australia Department of Chemical Engineering University of Western AustraliaPerthWA6009Australia Shaoxing Baojing Composite Materials Co. LtdShaoxing312073PR China School of Materials Science and Engineering Southwest University of Science and TechnologyMianyang621000PR China Key Laboratory of Road Construction Technology and Equipment MOEChang'an University Xi'an710064PR China

This study presents a simple technique for strengthening the adhesive-bond strength between aluminium(Al)substrate and carbon fibre reinforced polymer(CFRP) utilising resin pre-coating(RPC) with carbon nanotubes(CNTs). The CNT-containing RPC solution with 90 wt% acetone and 10 wt% resin(without hardener) was applied onto Al substrates, where micro-/nano-vertical channels had been created by chemical or mechanical surface treatments to accommodate CNTs. RPC was able to fill all micro-/nano-cavities over the Al substrate surface, then CNTs were pulled into those vertical micro-channels by the capillary action generated from acetone *** epoxy adhesive(resin + hardener) was applied after the CNT-containing RPC treatment. CNTs bridging across the interface between the adhesive joint and Al substrate and sealing of micro-/nano-cavities by RPC effectively enhanced the interfacial shear bond strength between the Al substrate and CFRP by 30–100%depending on the Al substrate surface profiles. Al substrates with two different chemical treatments were compared in this study for the effectiveness of CNT interfacial reinforcement. Results from a steel substrate after sandblasting were also included for comparison.

关键词： Shear bond strength Interfacial toughening CNT Resin pre-coating(RPC) Chemical surface treatment Aluminium/CFRP Laminate

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hale gas reservoir modeling and production evaluation considering complex gas transport mechanisms and dispersed distribution of kerogen

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Petroleum Science 2021年第1期18卷 195-218页

作者： Jie Zeng Jishan Liu Wai Li yee-kwong leong Derek Elsworth Jianchun Guo School of Engineering The University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of Energy and Mineral Engineering G3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA 16802USA State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

Stimulated shale reservoirs consist of kerogen,inorganic matter,secondary and hydraulic *** dispersed distribution of kerogen within matrices and complex gas flow mechanisms make production evaluation *** we establish an analytical method that addresses kerogen-inorganic matter gas transfer,dispersed kerogen distribution,and complex gas flow mechanisms to facilitate evaluating gas *** matrix element is defined as a kerogen core with an exterior inorganic *** most previous models,we merely use boundary conditions to describe kerogen-inorganic matter gas transfer without the instantaneous kerogen gas source *** is closer to real inter-porosity flow conditions between kerogen and inorganic *** diffusion,surface diffusion,adsorption/desorption,and slip corrected flow are involved in matrix gas ***-fracture coupling is realized by using a seven-region linear flow *** model is verified against a published model and field *** reveal that inorganic matrices serve as a major gas source especially at early *** provides limited contributions to production even under a pseudo-steady *** properties’influence starts from the late matrix-fracture inter-porosity flow regime,while inorganic matter properties control almost all flow regimes except the early-mid time fracture linear flow *** contribution of different linear flow regions is also documented.

关键词： Analytical solution Shale gas reservoir Well performance Kerogen and inorganic matter

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Human induced pluripotent stem cell-derived therapies for regeneration after central nervous system injury

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Neural Regeneration Research 2025年第11期20卷 3063-3075页

作者： Stephen Vidman yee Hang Ethan Ma Nolan Fullenkamp Giles W.Plant Department of Neuroscience Ohio State UniversityColumbusOHUSA

In recent years,the progression of stem cell therapies has shown great promise in advancing the nascent field of regenerative *** the non-regenerative nature of the mature central nervous system,the concept that“blank”cells could be reprogrammed and functionally integrated into host neural networks remained *** work has also demonstrated the ability of such cells to stimulate intrinsic growth programs in post-mitotic cells,such as *** embryonic stem cells demonstrated great potential in treating central nervous system pathologies,ethical and technical concerns *** barriers,along with the clear necessity for this type of treatment,ultimately prompted the advent of induced pluripotent stem *** advantage of pluripotent cells in central nervous system regeneration is multifaceted,permitting differentiation into neural stem cells,neural progenitor cells,glia,and various neuronal *** precise spatiotemporal application of extrinsic growth factors in vitro,in addition to microenvironmental signaling in vivo,influences the efficiency of this directed *** the pluri-or multipotency of these cells is appealing,it also poses the risk of unregulated differentiation and teratoma *** of the neuroectodermal lineage,such as neuronal subpopulations and glia,have been explored with varying degrees of *** the risk of cancer or teratoma formation is greatly reduced,each subpopulation varies in effectiveness and is influenced by a myriad of factors,such as the timing of the transplant,pathology type,and the ratio of accompanying progenitor ***,successful transplantation requires innovative approaches to develop delivery vectors that can mitigate cell death and support ***,host immune responses to allogeneic grafts must be thoroughly characterized and further developed to reduce the need for *** to a clinical setting wi

关键词： axon regeneration central nervous system regeneration induced pluripotent stem cells neurotrauma regenerative medicine spinal cord injury stem cell therapy

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Recent Expedition in Pd-Catalyzed Sonogashira Coupling and Related Processes

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Chinese Journal of Chemistry 2023年第9期41卷 1099-1118页

作者： Pui Ying Choy Kin Boon Gan Fuk yee kwong Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina Shenzhen Center of Novel Functional Molecules Shenzhen Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic MoleculesCUHK Shenzhen Research InstituteNo.10.Second Yuexing RoadShenzhenGuangdong 518507China

Sonogashira cross-coupling protocol,typically showing the reaction between aryl/vinyl halide and terminal alkyne,has been a widely used protocol for constructing C(sp2)-C(sp)*** resulting internal alkynes are highly versatile for reaching differently function-alized alkyne-containing scaffolds or serving as valuable synthetic synthons to many other functional *** is worth noting that products originated from this coupling reaction are mostly applicable to be transformed into corresponding Z-alkene,alkane,or het-erocyclic moieties in natural product *** reaction conditions and catalyst systems are able to be tweaked in order to facil-itate the activation of steric hindered and/or electron-rich ***-catalyzed copper-free Sonogashira coupling reaction has caught increasing attention as the improved method can be more environmentally *** is more,the conditions of the cou-pling reaction can be readily amended to allow the fusion of other carbonylation or decarboxylation step in the catalytic cycle,and thus allow more complex yet versatile convergent synthesis to proceed in an operationally simple one-pot manner.

关键词： Sonogashira Alkynylation Palladium Multicomponent reactions Cross-Coupling

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Size prediction of κ-carrageenan droplets formed in co-flowing immiscible liquid

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Particuology 2011年第6期9卷 637-643页

作者： Jun-yee leong Tek-Kaun Lim Ravindra Pogaku Eng-Seng Chan Centre of Materials and Minerals School of Engineering and Information Technology Universiti Malaysia Sabah School of Engineering Monash University

The formation of K-carrageenan droplets in channel emulsification was experimentally investigated. The dispersed phase was vertically injected into co-flowing immiscible palm oil in the direction of gravity. This study focused on predicting K-carrageenan drop size using force balance analysis. The force balance model considers the interracial tension to be the solitary attaching force, while a combination of the drag force from the co-flowing palm oil and the body force of the extruding K-carrageenan liquid act as the detaching forces. The conventional model gave poor predictions for droplet size, with an average relative deviation of 23%. This large deviation could be attributed to necking phenomena and an underestimation of the drag force generated on the shear-thinning K-carrageenan solution. By incorporating correction factors, the average relative deviation of the force balance model dronned to 4%.

关键词： K-Carrageenan Droplet Channel emulsification Co-flowing Dripping Bioencapsulation

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Asymmetric hydrogenation of aromatic ketones using new chiral-bridged diphosphine/diamine-Ru(Ⅱ) complexes

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Chinese Chemical Letters 2010年第12期21卷 1403-1406页

作者： Yu Ming Cui Lai Lai Wang Fuk yee kwong Wei Sun State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China Open Laboratory of Chirotechnology of the Institute of Molecular Technology for Drug Discovery and Synthesis and Department of Applied Biology and Chemical technology The Hong Kong Polytechnic University Hong Kong China Graduate University of Chinese Academy of Sciences Beijing 100039 China

A series of chiral secondary alcohols were easily prepared by means of asymmetric hydrogenation of prochiral aromatic ketones using a new（（Rax）-BuP）/（R,R）-DPEN-Ru（Ⅱ） complex catalyst *** hydrogenation of 2-methylacetophenone in n-butanol （t-BuOK/Ru =45.6/1,S/C = 500,20 *** H2,20℃,48 h） afforded（S）-1-（2＇-methylphenyl）ethanol in 92%ee and〉99% conversion.

关键词： Asymmetric hydrogenation Chiral alcohols Diphosphine ligand Ruthenium complexes Diamine

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Sensitized photooxygenation^+——VI. Kinetic studies on the singlet oxygenation of 6-ethyl-3,4-dihydro-2H-pyran-5-carboxylic acid ethyl ester and 6-isopropyl-3,4-dihydro-2H-pyran-5-carboxylic acid ethyl ester

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Chinese Journal of Chemistry 1991年第6期9卷 506-511页

作者： HUANG Ze-En LIANG Xiao-Guang LEUNG Hiu-kwong CHAN Yuk-yee Institute of Photographic Chemistry The Chinese Academy of SciencesBeijing 100101

Kinetic studies of the singlet oxygenation of the title compounds were performed accord- ing to Monroe's method. The reaction rate increases with temperature decreasing, leading to a ne- gative activation enthalpy and a large negative activation entropy. These data are interpreted as the evidence for the intermediacy of an exciplex. The solvent effect on the reaction rate suggests that the “dioxetane” path involves a transition state or an intermediate with significant zwitterionic character. The electronic effect of the substituent is obvious, with electron-withdrawing substituent retarding the reaction and electron-donating substituent increasing the reaction rate. However, steric bulkiness at the 6-position does not play an important role in the reaction rate.

关键词： rate Kinetic studies on the singlet oxygenation of 6-ethyl-3,4-dihydro-2H-pyran-5-carboxylic acid ethyl ester and 6-isopropyl-3,4-dihydro-2H-pyran-5-carboxylic acid ethyl ester Sensitized photooxygenation acid VI

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Epinephrine injection therapy versus a combination of epinepnrine injection and endoscopic hemoclip in the treatment of bleeding ulcers

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World Journal of Gastroenterology 2005年第7期11卷 1044-1047页

作者： Tju-Siang Chua kwong-Ming Fock Tay-Meng Ng Eng-Kiong Teo Jessica Yi-Lyn Tan Tiing-leong Ang Division of Gastroenterology

AIM: To assess the efficacy of hemoclip application in combination with epinephrine injection in the treatment of bleeding peptic ulcers and to compare the clinical outcomes between patients treated with such a combination therapy and those treated with epinephrine injection ***: A total of 293 patients (211 males, 82females) underwent endoscopic therapy for bleeding peptic ulcers. Of these, 202 patients (152 males, 50females) received epinephrine injection therapy while 91patients (59 males, 32 females) received combination therapy. The choice of endoscopic therapy was made by the endoscopist. Hemostatic rates, rebleeding rates, need for emergency surgery and 30-d mortality were the outcome measures ***: Patients who received combination therapy were significantly older (mean age 66±16 years, range24-90 years) and more suffered from chronic renal failure compared to those who received epinephrine injection therapy alone (mean age 61±17 years, range 21-89 years).Failure to achieve permanent hemostasis was 4% in the group who received epinephrine injection alone and 11%in the group who received combination therapy. When the differences in age and renal function between the two treatment groups were taken into account by multivariate analysis, the rates of initial hemostasis,rebleeding rates, need for surgery and 30-d mortality for both treatment options were not significantly ***: Combination therapy of epinephrine injection with endoscopic hemoclip application is an effective method of achieving hemostasis in bleeding peptic ulcer diseases. However, superiority of combination therapy over epinephrine injection alone, could not be demonstrated.

关键词： Bleeding peptic ulcer Epinephrine Endoscopic hemoclip Combination therapy

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Usage of topical insulin for the treatment of diabetic keratopathy,including corneal epithelial defects

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World Journal of Diabetes 2023年第6期14卷 930-938页

作者： Ching yee leong Ainal Adlin Naffi Wan Haslina Wan Abdul Halim Mae-Lynn Catherine Bastion Department of Ophthalmology Universiti Kebangsaan Malaysia Medical CentreKuala Lumpur 56000Wilayah PersekutuanMalaysia

BACKGROUND Diabetic keratopathy(DK)occurs in 46%-64%of patients with diabetes and requires serious *** patients with diabetes,the healing of corneal epithelial defects or ulcers takes longer than in patients without *** is an effective factor in wound *** ability of systemic insulin to rapidly heal burn wounds has been reported for nearly a century,but only a few studies have been performed on the effects of topical insulin(TI)on the *** with TI is effective in treating *** To review clinical and experimental animal studies providing evidence for the efficacy of TI to heal corneal *** National and international databases,including PubMed and Scopus,were searched using relevant keywords,and additional manual searches were conducted to assess the effectiveness of TI application on corneal wound *** articles published from January 1,2000 to December 1,2022 were *** relevancy of the identified citations was checked against predetermined eligibility standards,and relevant articles were extracted and *** A total of eight articles were found relevant to be discussed in this review,including four animal studies and four clinical *** to the studies conducted,TI is effective for corneal re-epithelialization in patients with diabetes based on corneal wound size and healing *** Available animal and clinical studies have shown that TI promotes corneal wound healing by several *** use of TI was not associated with adverse effects in any of the published *** studies are needed to enhance our knowledge and understanding of TI in the healing of DK.

关键词： Diabetes mellitus Diabetic keratopathy Topical insulin Healing

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