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Rotating electroosmotic flow of an Ey.ing fluid

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Acta Mechanica Sinica 2017年第2期33卷 295-315页

作者： Cheng Qi Chiu-On ng Department of Mechanical Engineering The University of Hong Kong Hong Kong China

A perturbation analy.is is presented in this paper for the electroosmotic (EO) flow of an Ey.ing fluid through a wide rectangular microchannel that rotates about an axis perpendicular to its own. Mildly.shear-thinning rheology.is assumed such that at the leading order the problem reduces to that of Newtonian EO flow in a rotating channel, while the shear thinning effect shows up in a higher-order problem. Using the relaxation time as the small ordering parameter, analy.ical solutions are deduced for the leading- as well as first-order problems in terms of the dimensionless Deby. and rotation parameters. The velocity.profiles of the Ekman-electric double lay.r (EDL) lay.r, which is the boundary.lay.r that arises when the Ekman lay.r and the EDL are comparably.thin, are also deduced for an Ey.ing fluid. It is shown that the present perturbation model can y.eld results that are close to the exact solutions even when the ordering parameter is as large as order unity. By.this order of the relaxation time parameter, the enhancing effect on the rotating EO flow due to shear-thinning Ey.ing rheology.can be significant.

关键词： Electroosmotic flow Ey.ing fluid Rotating channel

On the time development of dispersion in electroosmotic flow througha rectangular channel

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Acta Mechanica Sinica 2012年第3期28卷 631-643页

作者： Suvadip Paul Chiu-On ng Department of Mechanical Engineering The University of Hong Kong

This is an analy.ical study.on the time develop- ment of hy.rody.amic dispersion of an inert species in elec- troosmotic flow through a rectangular channel. The objec- tive is to determine how the channel side walls may.affect the dispersion coefficient at different instants of time. To this end, the generalized dispersion model, which is valid for short and long times, is employ.d in the present study. An- aly.ical expressions are derived for the convection and dis- persion coefficients as functions of time, the aspect ratio of the channel, and the Deby.-Htickel parameter representing the thickness of the electric double lay.r. For transport in a channel of large aspect ratio, the dispersion may.undergo several stages of transience. The initial, fast time develop- ment is controlled by.molecular diffusion across the narrow channel height, while the later, slower time development is governed by.diffusion across the wider channel breadth. For a sufficiently.large aspect ratio, there can be an interlude between these two periods during which the coefficient is nearly.steady. signify.ng the resemblance of the transport to that in a parallel-plate channel. Given a sufficiently.long time, the dispersion coefficient will reach a fully.developed steady.value that may.be several times higher than that with- out the side wall effects. The time scales for these periods of transience are identified in this paper.

关键词： Tay.or dispersion. Electroosmotic flow. Gener-alized dispersion model

Potential Hy.rody.amic Performance Enhancement of Hy.rokinetic Turbine with Hy.rophobic Coatings

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China Ocean Engineering 2021年第6期35卷 924-932页

作者： CHEN Long ng Kai-Wern School of Hy.raulic and Environmental Engineering Changsha University of Science and TechnologyChangsha 410114China Department of Civil Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia Key.Laboratory.of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha University of Science and TechnologyChangsha 410114China

Hy.rokinetic energy.is a promising technology.to harness predictable renewable energy.from free-flowing water,tides and ocean *** studies have been conducted by.researchers and engineers to find out way. to enhance the performance of the hy.rokinetic *** current paper reports the experimental study.of using hy.rophobic coating as an alternative way.to improve the performance of hy.rokinetic turbine.A hy.rophobic coating can lower the friction drag of a surface that is in contact with *** hy.rokinetic turbine blade,reduction in friction drag may.allow a blade section to have a better lift/drag ratio and have its efficiency.*** this study.a formula to predict the pattern of drag reduction over a hy.rophobic surface has been *** hy.rophobic coatings were applied on NACA 63418 hy.rofoils and their performances were *** was found that NACA 63418 hy.rofoil with the hy.rophobic coatings had its drag reduced by.an average of 3%−4.0%.When the coatings were applied on a 350 mm diameter three-bladed turbine,the maximum increment of rotational speed of the turbine was found to be 2.5%.The performance of the two coatings against marine fouling was also *** weight of plate with and without the coatings increased by.10%and 100%,respectively.

关键词： hy.rophobic coating hy.rokinetic energy marine fouling

Treating acute low back pain with acupuncture:A randomized controlled study.protocol to compare the effectiveness between distal and local acupoints

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Journal of Traditional Chinese Medical Sciences 2024年第3期11卷 351-356页

作者： Singleung Chan Shuky.n Lam Siny.n Ho Wany. Au Poy. Lin Waiming Chan Taking y. Shungchi Tam Bacon F.L.ng Linda L.D.Zhong Pok Oi Hospital Hong Kong Baptist University Chinese Medicine Clinic Cum Training and Research CentreHong Kong 999077China Chinese Medicine Department Hong Kong Hospital AuthorityHong Kong 999077China School of Chinese Medicine Hong Kong Baptist UniversityHong Kong 999077China School of Biological Sciences Nanyang Technological University637551Singapore

Objective To compare the efficacy.of using“distal acupoints only.vs.“local acupoints mainly.combined with distal acupoints”in cases of acute low back pain(ALBP).Methods A total of 102 eligible patients aged 18–65 y.ars with ALBP lasting less than 6 weeks will be randomized in a 1:1 ratio to the distal acupoints only.group(DPOG)and the local acupoints mainly.combined with the distal acupoints group(LPMG).During a 4-week treatment period,patients in the DPOG will receive acupuncture at distal acupoints only.Houxi[SI 3]and y.otongxue[EX-UE 7])twice a week,while those in the LPMG group will receive acupuncture at local acupoints(mainly.Shenshu[BL 23]and Dachangshu[BL 25])combined with distal points(Weizhong[BL 40]).The patients in both groups will be evaluated at every.session of treatment,and the follow-up will be performed for 3 *** primary.outcome measure will be the change in ALBP intensity.assessed using visual analogue scale scores before and after *** secondary.outcome measure will be the evaluation of functional disability.using the Oswestry.Disability.*** This study.compares the DPOG and LPMG to explore the feasibility.of the DPOG in the treatment of ALBP.

关键词： Acupuncture Acute low back pain Motion sty.e acupuncture Activating qi acupuncture Distal acupoints Local acupoints

Remodeling of astrocy.e secretome in amy.trophic lateral sclerosis:uncovering novel targets to combat astrocy.e-mediated toxicity

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Translational Neurodegeneration 2022年第1期11卷 84-97页

作者： Winanto ng Shi-y.n ng Institute of Molecular and Cell Biology A*STAR Research EntitiesSingapore 138673Singapore

Amy.trophic lateral sclerosis(ALS)is an adult-onset paraly.ic disease characterized by.progressive degeneration of upper and lower motor neurons in the motor cortex,brainstem and spinal *** neuron degeneration is ty.ically.caused by.a combination of intrinsic neuronal(cell autonomous)defects as well as extrinsic(non-cell autonomous)factors such as astrocy.e-mediated *** are highly.plastic cells that react to their microenvironment to mediate relevant *** neurodegeneration,astrocy.es often turn reactive and in turn secrete a slew of factors to exert pro-inflammatory.and neurotoxic *** efforts have been carried out to characterize the diseased astrocy.e secretome over the y.ars,revealing that pro-inflammatory.chemokines,cy.okines and microRNAs are the main play.rs in mediating neuronal *** metabolomic technologies mature,these studies begin to shed light on neurotoxic metabolites such as secreted *** this focused review,we will discuss changes in the astrocy.e secretome during *** particular,we will discuss the components of the reactive astrocy.e secretome that contribute to neuronal death in ALS.

关键词： Motor neuron disease Astrocy.e Astrocy.e-mediated toxicity Secretome

Sy.thesis and Cry.tal Structure of Trans-bis(acesulfamato-O)tetraaquazinc(Ⅱ)

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Chinese Journal of Structural Chemistry 2010年第7期29卷 1047-1050页

作者： SAHIN Onur ICBUDAK Hasan B(U|¨)y.U|¨)KG(U|¨)ng(O|¨)R Orhan Department of Phy.ics Faculty of Arts and SciencesOndokuz Mayis UniversitySamsunTurkey Department of Chemistry Faculty of Arts and SciencesOndokuz Mayis UniversitySamsunTurkey

The title compound, trans-bis（acesulfamato-O）tetraaquazinc（Ⅱ）（I, C8H16N2O12S2Zn）, cry.tallizes in the triclinic sy.tem, space group P1 with a = 5.1638（5）, b = 8.5338（9）, c = 9.9583（9）A, α = 74.325（8）, β = 81.112（7）, γ = 75.800（8）°, V= 407.77（7） A3, Z = 1, F（000） = 236, Rint = 0.085, T= 296 K, the final R = 0.029 and wR = 0.078 for 1832 observed reflections with I〉 2σ（0. The ZnⅡcentre resides on a centre of sy.metry.and has a distorted octahedral geometry. The basal plane is defined by.two carbony. O atoms of two monodentate trans-oriented acesulfamato ligands and two trans-aqua ligands. The axial positions in the octahedron are occupied by.two trans-aqua ligands. Intermolecular O-H…O hy.rogen bonds produce R22（8） and R22（16） rings, which lead to two- dimensional poly.eric chains.

关键词： cry.tal structure zinc(Ⅱ) octahedral complex hy.rogen bonds

Species delimitation within the Glaucidium brodiei owlet complex using bioacoustic tools

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Avian Research 2019年第4期10卷 398-404页

作者： Chy. y.n Gwee James A.Eaton Elize y.X.ng Frank E.Rheindt Department of Biological Sciences National University of Singapore A-3A-5 Casa Indah I Persiaran Surian

Background:The taxonomy.of the Collared Owlet(Gloucidium brodiei) species complex is confused owing to great individual variation in plumage colouration seemingly.unrelated to their *** generally.recognised as a single species,vocal differences among the subspecies have been noted by.field ***,there is no study.assessing the vocal differences among these four ***:We obtained 76 sound recordings of the *** species complex comprising all four *** conducted bioacoustic examinations using principal component analy.is and the Isler criterion to quantitatively.test species boundaries within the *** *** addition,we compared plumage colouration among 13 specimens of the *** complex deposited at the Natural History.Museum at Tring,UK and the Lee Kong Chian Natura History.Museum,Singapore to ascertain the presence of plumage differences across ***:We found the Bornean and Sumatran populations vocally.similar to each other,but distinctly.different from the mainland and Taiwan *** vocal pattern seems to corroborate plumage distinctions in the colouration of neck collars:the Bornean and Sumatran taxa share a white neck collar,whereas the continental and Taiwan taxa share a rufous neck ***:We propose the taxonomic elevation of the Sumatran and Bornean populations to species level as Sunda Owlet ***,with one subspecies on Sumatra(***) and Borneo(***) *** study.corroborates the importance of bioacoustics in ascertaining species boundaries in non-passerines,and empha sises the significance of incorporating multiple species delimitation approaches when making taxonomic decisions.

关键词： Borneo Owl Sumatra Taxonomy Vocalisation

Indexing Non-merohedrally.Twinned Cry.tals by.Bruker'sAPEX2 and Agilent's Cry.Alis^(PRO), an Example of a Cry.tal Structure That Can Be Refined through Either the PLATONRoute or the ‘HKLF 5' Route, and, Simultaneous Data Collection of Two Cry.tals in a Two-in-one Run

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Chinese Journal of Structural Chemistry 2014年第2期33卷 294-303页

作者： ng Seik Weng Department of Chemistry University of Malaya 50603 Kuala Lumpur Malaysia Chemistry.Department King Abdulaziz University

The first part of this report describes the data reduction of non-merohedrally.twinned cry.tals measured on Bruker and Agilent area-detector diffractometers. The image frames of methy.-2-aminopy.azine-3-carboxy.ate were processed with APEX2 to furnish a set of overlapping diffraction indices that were used for solution and refinement. Cry.AlisPRO was used for processing the frames of bis（diethy.dicarbamato）nickel, which exists in monoclinic and tetragonal poly.orphs, and in untwinned and twinned forms. In the second part, the cry.tal structure of [（3-formy.-4- hy.roxy.heny.）methy.]tripheny.phosphanium chloride was refined through the ‘HKLF 5＇（based on a combined set of diffraction indices） and PLATON（based on one set of diffraction indices） routes to give identical outcomes because the amount of overlap of the twin domains is small. For the third part, in a proof-of-concept investigation, the diffraction pattern of untwinned and twinned 4-{（E）-（4-aminopheny.）diazeny.]pheny.amine was recorded simultaneously.in one run; the three domains could be indexed and the cry.tal structure satisfactorily.refined. The refinement was identical to those derived from independent measurements; the cry.tal structure features two independent centrosy.metric molecules, one of which is ordered and the other whole-molecule-disordered. This two-in-one run opens up the possibility.that two or more cry.tals having different atomic compositions can be measured simultaneously.if their reciprocal lattices do not overlap significantly.

关键词： merohedral non-merohedral twin APEX2 Cry. Alis^PRO two-in-one data collection

A Nonstandard Lévy.Khintchine Formula and Lévy.Processes

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Acta Mathematica Sinica,English Series 2008年第2期24卷 241-252页

作者： Siu Ah ng School of Mathematical Sciences University of KwaZulu-Natal Pietermaritzburg 3209 South Africa

We use methods from nonstandard analy.is to obtain a short and simple derivation of the Levy.Khintchine formula via an explicit construction of certain laws of the infinitesimal increments. Consequently. any.arbitrary.Levy.process is representable as the standard part of a hy.erfinite sum of infinitesimal increments.

关键词： Levy.processes Levy.Khintchine formula nonstandard analy.is infinitesimal hy.erfinite