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WAVE INDUCED OSCILLATOrY AND STEADY FLOWS IN THE ANNULUS OF A CATHETErIZED VISCOELASTIC TUBE

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Journal of Hydrodynamics 2010年第5期22卷 605-617页

作者： ng Chiu-On CHAng Yin-Yee Department of Mechanical Engineer.ng The University of Hong Kong

A perturbation analysis based on equations of motion in Lagr.ngian form is presented for the oscillatory and time-mean viscous flows induced by a propagating wave of small amplitude in an annulus with a viscoelastic outer wall. Owing to the steady streaming effect, the existence of a catheter in a blood vessel br.ngs in an additional steady pressure gradient, a correction to that predicted by the linear theory, and an additional steady shear stress, which may increase the possibility of hemolysis of red blood cells.

关键词： annulus flow steady streaming catheterized artery

Assessment of the kinetic–frictional model for dense granular flow

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particuology 2008年第1期6卷 50-58页

作者： Boon Ho ng Mojtaba Ghadiri Institute of particle Science&Engineer.ng University of LeedsLeeds LS2 9JTUK

This paper aims to quantitatively assess the application of kinetic-frictional model to simulate the motion of dry granular materials in dense condition, in particular, the annular shear.ng in Couette configuration. The weight of frictional stress was varied to study the contribution of the frictional stress in dense granular flows. The results show that the pure kinetic-theory-based computational fluid dynamics （CFD） model （without frictional stress） over-predicts the dominant solids motion of dense granular flow while adding frictional stress [Schaeffer, D. G. （1987）. Instability in the evolution equations describing incompressible granular flow. Journal of Differential Equations, 66（1）, 19-50] with the solids pressure of [Lun, C. NTK., Savage, S. B., Jeffrey, D. J., ＆ Chepurniy, N. （1984）. Kinetic theories for granular flow： Inelastic particles in Couette flow and slightly inelastic particles in a general flow field. Journal of Fluid Mechanics, 140, 223-256] in the CFD model improves the simulation to better conform available experimental results. The results also suggest that frictional stress transmission plays an important role in dense granular flow and should not be neglected in granular flow simulations. Compatible simulation results to the experimental data are seen by increasing the weight of frictional stress to a factor of 1.25-1.5. These improved simulation results suggest the current constitutive relations （kinetic-frictional model） need to be improved in order to better reflect the real dense granular flow.

关键词： Gas-solids flow CFD Constitutive relations Couette flow Kinetic theory Kinetic-frictional model

Analysis and Optimization of Operational and pollutant Attributes of Diesel Engine with CNT-Infused Or.nge peel Biodiesel-Diesel Blend Fuel

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Journal of Thermal Science 2024年第2期33卷 761-778页

作者： ranjeet rAI r.r.SAHOO Mechanical Engineer.ng Department GLA UniversityMathura281406India Mechanical Engineer.ng Department IIT(BHU)Varanasi221005India

The current study is performed to find sustainable solutions for the future of transportation and environmental *** conventional methods and experimental design table(L16 Orthogonal Array)techniques have been employed to examine and optimize a diesel-powered engine's operational and pollutant *** L16 Orthogonal Array is obtained through Taguchi's experimental design approach using Minitab 16 *** experimental design incorporated three control variables,namely engine speed,fuel type,and engine load,each with four *** operational parameters,namely brake thermal efficiency(BTE)and brake specific fuel consumption(BSFC),as well as the emission characteristics,including hydrocarbon(HC),carbon monoxide(CO),nitrogen oxide(NO),and smoke emissions,were acquired using the L16 orthogonal array(OA) and subsequently *** utilization of methodologies such as signal-to-noise(S/N) ratio and grey analysis was employed to determine the optimal operational state of the engine to achieve maximum performance while minimizing *** engine's ideal state of operation,in terms of BTE and BSFC,was determined to be at 75% engine load,1000 r/min engine speed,and using 10^(-4)(in vol) carbon nanotube incorporated 20% or.nge peel biodiesel(OpB20CNT100) blended fuel(A3-B1-C4).The study indicated that engine load significantly influenced BTE and BSFC,with 84.05% and 87.79% contribution factors,*** 25% engine load,1000 r/min,and OpB20CNT100 fuel(A1-B1-C4) CO,smoke,NO,and HC emissions were the *** load affects emissions the *** BSFC increased 3.10% and NO emissions 1.77%.BTE,CO,smoke,and HC emissions decreased by 1.9%,12.29%,47.05%,and 47.22%,respectively,at optimal operating conditions concerning diesel *** study shows that Taguchi-Grey's experimental design optimizes diesel engine operational and pollutant *** outcomes revealed that or.nge peel biodiesel infused with CNT can replace diesel fuel in a

关键词： Taguchi-Grey method OpB20CNT100 transesterification S/N ratio GrG HC CO and NO

‘Whole-molecule Disorder’ refinement of 4-Tricyanovinyl-N,N-diethylaniline

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Chinese Journal of Structural Chemistry 2011年第9期30卷 1286-1288页

作者： ng Seik Weng Department of Chemistry University of Malaya Chemistry Department Faculty of Science King Abdulaziz University

The molecule of 4-tricyanovinyl-N,N-diethylaniline is disordered about an axis that is close to the axis passing through the 1,4-carbon atoms. The disorder is a 1：1 type of disorder that involves only part of the molecule as the diethylamino substitutent and the three nitrogen atoms of the tricyanovinyl substituent are ordered. The treatment of the nearly ‘whole-molecule disorder’ by employing a small number of restraints is described. Crystal data： C15H14N4, triclinic, p , a = 7.1996（5）, b = 7.7232（5）, c = 12.4171（8） , α = 99.350（1）, β = 94.647（1）, γ = 103.312（1）o and V = 657.90（8） 3 at –173 K.

关键词： whole-molecule disorder

‘Whole-molecule Disorder’ refinement of 4-(4-Hydroxybenzylideneiminio)phenol Hemichloride Hemihydroxide

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Chinese Journal of Structural Chemistry 2011年第9期30卷 1283-1285页

作者： ng Seik Weng Department of Chemistry University of Malaya

The two independent cations of the salt, [HO-C6H4-CH=NH-C6H4-OH]·1/2OH·1/2Cl, are both disordered about an axis connecting the two oxygen atoms at the para-positions of the aromatic r.ngs, the disorder being in a 83：17 ratio in one cation and 91：9 in the other. The hydroxide and chloride anions are ordered. The treatment of the nearly ‘whole-molecule disorder’ by employing a small number of restraints is described. Crystal data： C13H12.5Cl0.5NO2.5, triclinic, p , a = 9.1731（4）, b = 9.2048（4）, c = 15.9144（7） , α = 104.822（1）, β = 90.077（1）, γ = 118.641（1）o and V = 1127.86（9） 3 at –173 K.

关键词： whole-molecule disorder

The roles of black phosphorus in performance enhancement of halide perovskite solar cells

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Journal of Energy Chemistry 2022年第4期31卷 672-683页

作者： Damir Aidarkhanov Charles Surya Annie ng Department of Electrical and Computer Engineer.ng School of Engineering and Digital SciencesNazarbayev UniversityKabanbay Batyr Ave.53Nur-Sultan 010000Kazakhstan Innovation and Technology Commission Central Government Offices2 Tin Mei AvenueHong Kong 999077China

Hybrid organic-inorganic perovskite solar cells(pSCs) are considered to be the most promising thirdgeneration photovoltaic(pV) technology with the most rapid rate of increase in the power conversion efficiency(pCE). To date, their pCE values are comparable to the established photovoltaic technologies such as crystalline silicon. Intensive research activities associated with pSCs have been being performed,since 2009, aiming to further boost the device performance in terms of efficiency and stability via different strategies in order to accelerate the progress of commercialization. The emerging 2 D black phosphorus(Bp) is a novel class of semiconducting material owing to its unique characteristics, allowing them to become attractive materials for applications in a variety of optical and electronic devices, which have been comprehensively reviewed in the literature. However, comprehensive reviews focusing on the application of Bp in pSCs are scarce in the community. This review discusses the research works with the incorporation of Bp as a functional material in pSCs. The methodology as well as the effects of employing Bp in different regions of pSCs are summarized. Further challenges and potential research directions are also highlighted.

关键词： perovskite solar cells Black phosphorus power conversion efficiency Stability Low dimensional materials

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微生物自修复混凝土的制备及性能研究

价值工程 2024年第10期43卷 74-76页

作者：李茜茜刘昭洋赵明敏 Serina ng 王进春石家庄市长安育才建材有限公司石家庄051430 石家庄市建筑功能材料产业技术研究院石家庄051430 四川砼道科技有限公司成都610200

通过嗜碱芽孢杆菌胶与匹配的胶结液制备微生物修复剂,并自主研发疏水剂,通过向混凝土中加入疏水剂,改变了混凝土颗粒结构、降低土微粒界面活性,使之可以更好地配合微生物胶结对混凝土的固化,固化后的混凝土韧性大大提升,避免混凝土发生... 详细信息

通过嗜碱芽孢杆菌胶与匹配的胶结液制备微生物修复剂,并自主研发疏水剂,通过向混凝土中加入疏水剂,改变了混凝土颗粒结构、降低土微粒界面活性,使之可以更好地配合微生物胶结对混凝土的固化,固化后的混凝土韧性大大提升,避免混凝土发生破坏后强度瞬间丧失的情况发生。并通过大蒜素水溶液,在后期加强微生物对混凝土的加工作用,实现混凝土的“自愈合”效果。

关键词：微生物自修复疏水剂混凝土裂缝

Europium recovery process by means of polymeric nanoparticles functionalized with acrylic acid,curcumin and fumaramide

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Journal of rare Earths 2024年第10期42卷 1950-1959页

作者： p.A.Martínez-Montoya J.M.del río A.de J.Morales-ramirez M.Corea Escuela Superior de Ingeniería Química e Industrias Extractivas ESIQIE-IPNDepartamento de Ingeniería Metalúrgica UPALM S/N Col.Lindavista Escuela Superior de Ingenieria Química e Industrias Extractivas ESIQIE-IPNLaboratorio de Investigación en Polímeros y NanomaterialesUPALM S/N Col.Lindavista Centra de Investigación e Innovación Tecnológica CIITEC-IPNCda.de CECATIs/n

polymeric nanoparticles of poly(methyl methacrylate) were obtained by emulsion polymerization techniques in a proce ss of two *** particles were functionalized with acrylic acid,curcumin,and fumaramide and three series of polymeric particles were *** incorporation of functional groups was confirmed by Fourier transform-infrared spectrosocopy(FT-Ir) and ultraviolet-visible(UV-Vis) *** spherical morphology of particles with an average diameter of 100 nm was observed by scartning electron microscopy(SEM).The polymeric materials were used for recovery of [Eu]from synthetic *** nanoparticles show excellent chelation capacity to trap rare-earth ions,because they recover more than 85% of [Eu] at pH of *** images of SEM after extraction process show arrays between particles with larger average particle sizes to 1.5 *** addition,the particles have a good stripp.ng capacity,exceeding 50% of it,maintaining their homogeneity in morphology and good stability in dispersion for the recovery and stripp.ng processes.A pseudo-second model order is obtained for the extraction and stripp.ng processes while the best results of stripp.ng process are obtained at pH of6.

关键词： [Eu] recovery Chelating effect Extraction process Stripp.ng process Emulsion polymerization rare earths

Development of alternative in vitro methods to screen for pulmonary toxicities——characterization of epithelial-macrophage co-cultures at the air-liquid Interface

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Development of alternative in vitro methods to screen for pu...