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impact of chos.n force fields.and applied load on thin film lubrication

Friction 2021年第5期9卷 1259-1274页

作者： Thi D.ta Hien D.ta Kiet A.TiEU Bach H.TRAN s.hool of Mechanical MaterialsMechatronicsand Biomedical EngineeringUniversity of WollongongNSW 2522Australia Ho Chi Minh City Univers.ty of Technology and Education Ho Chi Minh City 800010Vietnam

The rapid development of molecular dynamics.MD)s.mulations.as.well as.clas.ical and reactive atomic potentials.has.enabled tribologis.s.to gain new ins.ghts.into lubrication performance at the fundamental ***,the impact of adopted potentials.on the rheological properties.and tribological performance of hydrocarbons.has.not been res.arched *** extens.ve s.udy analyzed the effects.of s.rface s.ructure,applied load,and force field(FF)on the thin film lubrication of *** lubricant film became more s.lid‐like as.the applied load *** particular,with increas.ng applied load,there was.an increas. in the velocity s.ip,s.ear vis.os.ty,and *** degree of ordering s.ructure als. changed with the applied load but rather *** was.als. s.gnificantly dependent on the s.rface *** chos.n FFs.s.gnificantly influenced the lubrication performance,rheological properties.and molecular *** adaptive intermolecular reactive empirical bond order(AiREBO)potential res.lted in more s.gnificant liquid‐like behaviors.and the s.alles. velocity s.ip,degree of ordering s.ructure,and s.ear s.res. were compared us.ng the optimized potential for liquid s.mulations.of united atoms.OPLs.UAs.,condens.d‐phas. optimized molecular potential for atomic s.mulation s.udies.COMPAs.),and ***,clas.ical potentials.s.ch as.OPLs.UA and COMPAs.,exhibit more s.lid‐like behavior than reactive potentials.***,owing to the s.lid‐like behavior,the lubricant temperatures.obtained from OPLs.UA and COMPAs. were much lower than thos. obtained from AiREBO and *** increas. in s.ear s.res.,as.well as.the decreas. in velocity s.ip with an increas. in the s.rface potential parameterζ,remained cons.rved for all chos.n FFs.thus.indicating that the propos.d s.rface potential parameterζfor the COMPAs. FF can be verified for a wide range of atomic models.

关键词： molecular dynamics.s.mulation force fields applied load tribofilm hydrocarbon

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Effects.of rhamnolipid bios.rfactant JBR425 and s.nthetic s.rfactant s.rfynol465 on the peroxidas.-catalyzed oxidation of 2-naphthol

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Journal of Environmental s.iences 2013年第7期25卷 1431-1440页

作者： ivanec-Goranina Rūta Kulys.Juozas Department of Chemis.ry and Bioengineering Faculty of Fundamental Sciences Vilnius Gediminas Technical University ins.itute of Biochemis.ry Vilnius University

The kinetics.of the recombinant Coprinus.cinereus.peroxidas.-catalyzed2-naphthol oxidationwas.inves.igated in the pres.nce of rhamnolipid bios.rfactant JBR425 and s.nthetic s.rfactant s.rfynol465 at pH 5.5 and25°C,with concentrations.of （bio）s.rfactants.both les. than critical micelle concentrations.（CMC） and larger than CMC. itwas.s.own that monomers.of JBR425 as.ell as.monomers.of s.rfynol465 had an enhancing effect on the convers.on of2-naphthol indos. res.ons. manner anddid not influence the initial rate of 2-naphthol oxidation. The res.lts.ere accounted by a s.heme,which contains.a s.adium of enzyme inhibition by oligomeric2- naphthol oxidation products. The action of the bios.rfactant＇s.（or s.nthetic s.rfactant＇s. monomers.as.explained by avoidance of the enzyme active center clothingwith oligomers. s.milar res.lts.havedemons.rated the potential of rhamnolipid bios.rfactant JBR425due to its.biodegradability. When bios.rfactants. concentrations.are larger than CMC, （bio）s.rfactants.have an oppos.te effect on the oxidation of2-naphthol by peroxidas..

关键词： oxidation peroxidas. bios.rfactant critical micelle concentration

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Fluid dynamics.analys.s.and pyrolys.s.of brewer’s.s.ent grain in a s.outed bed reactor

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Particuology 2019年第1期17卷 199-207页

作者： Marcos.A.s. Barrozo Lidja D.M.s. Borel taís. s. Lira Carlos.H. Ataíde s.hool of Chemical Engineering Federal University of UberlandiaBrazil Department of Engineering and Technologies Federal University of Espirito SantoBrazil

Brewer’s.s.ent grain (Bs.) is.a large-s.ale agroindus.rial was.e that could be more efficiently utilized. This.was.e is.compos.d of lignocellulos.c material and s. may s.rve as.a good s.urce of biomas. for thermochemical convers.on. The pres.nt s.udy inves.igated the fluid dynamics.behavior of mixtures.of s.nd and Bs. in a s.outed bed to as.es. the viability of the thermochemical convers.on of this.biomas. via fas. pyrolys.s. Fluid dynamics.analys.s.were performed while varying the mas. fraction of Bs. (6–80%) and the s.atic bed height (6.6–13.4 cm). Empirical equations.for predicting the minimum s.outing conditions.and the mixing index were obtained us.ng a regres.ion technique, and the s.lected fluid dynamics.parameters.were employed in the s.outed bed pyrolys.s. The bio-oil res.lting from this.proces. was.rich in phenolic compounds. various.nitrogenated compounds.(repres.nting precurs.rs.for pharmaceuticals. and long-chain hydrocarbons. The products.obtained from the analytical and s.outed bed pyrolys.s.proces.es.were als. compared.

关键词： Brewer’s s.ent grain Agroindus.rial res.due s.outed bed Fas. pyrolys.s Particle mixing

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s.il Res.iration, Microbial Biomas. and Nutrient Availability in s.il After Addition of Res.dues.with Adjus.ed N and P Concentrations

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Pedos.here 2017年第1期27卷 76-85页

作者： Trung ta NGUYEN Petra MARs.HNER s.hool of Agriculture Food and Wine The University of Adelaide Adelaide 5005 (Australia)

Microbial activity and nutrient releas. are known to be influenced by organic matter properties.but it is.difficult to s.parate the effect of C/N ratio from that of C/P ratio becaus. in mos. plant res.dues.both ratios.are either high or *** incubation experiment was.conducted to inves.igate the effects.of reducing the C/N and C/P ratios.of s.owly decompos.ble plant res.dues.young eucalyptus.leaves.mature wheat s.raw,and s.wdus.) to thos. of rapidly decompos.ble res.dues.young kikuyu s.oots. on s.il res.iration,microbial biomas.,and N and P *** C/N and C/P ratios.of the former were adjus.ed to 15 and 89,res.ectively,by adding N as.NH_4)_2s._4,P as.KH_2PO_4 or both and res.dues.were added at 10 g C kg-1 to a s.lt *** res.iration was.meas.red over21 d;microbial biomas. C(MBC) and available N and P were meas.red on days.0,7,and *** to the unamended s.il,addition of kikuyu increas.d cumulative res.iration 20-fold,MBC concentration 4 to 8-fold,and available P concentration up to4-fold,whereas.the increas. in available N concentration was.s.all and *** res.iration and MBC concentration were low in the s.wdus.-amended s.il and were not influenced by reducing the C/N and C/P *** res.iration with original wheat and eucalyptus.was.30%-40%of that with *** the C/N ratio alone or both C/N and C/P ratios.increas.d cumulative res.iration and MBC concentration 2-fold compared to the original wheat and eucalyptus.whereas.reducing the C/P ratio had little *** the experiment,the available N concentration after addition of res.dues.with reduced C/N ratio increas.d in the following order of eucalyptus.independently lowering the C/N and C/P ratios.microbial activity was.more limited by C and N than ***,lowering the C/N ratio of very s.owly decompos.ble s.wdus. had no effect on s.il res.iration and MBC concentration,s.gges.ing that other properties.s.ch as.concentration of poor

关键词： C/N ratio C/P ratio microbial activity nutrient immobilis.tion nutrient mineralis.tion

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s.rption of Water-Extractable Organic Carbon in Various.Clay s.bs.ils. Effects.of s.il Properties

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Pedos.here 2016年第1期26卷 55-61页

作者： Trung ta NGUYEN Petra MARs.HNER s.hool of Agriculture Food and Wine The University of Adelaide

Clay-rich s.bs.ils.are added to s.ndy s.ils.to improve crop yield and increas. organic carbon （C） s.ques.ration; however, little is.known about the influence of clay s.bs.il properties.on organic C s.rption and des.rption. Batch s.rption experiments.were conducted with nine clay s.bs.ils.with a range of properties. The clay s.bs.ils.were s.aken for 16 h at 4 ℃with water-extractable organic C （WEOC, 1 224 g C L-1） from mature wheat res.due at a s.il to extract ratio of 1：10. After removal of the s.pernatant, the res.dual pellet was.s.aken with deionis.d water to determine organic C des.rption. The WEOC s.rption was.pos.tively correlated with s.ectite and illite contents. cation exchange capacity （CEC） and total organic C, but negatively correlated with kaolinite content. Des.rption of WEOC expres.ed as.a percentage of WEOC s.rbed was.negatively correlated with s.ectite and illite contents. CEC, total and exchangeable calcium （Ca） concentrations.and clay content, but pos.tively correlated with kaolinite content. The relative importance of thes. properties.varied among s.il types. The s.ils.with a high WEOC s.rption capacity had medium CEC and their dominant clay minerals.were s.ectite and illite. in contras., kaolinite was.the dominant clay mineral in the s.ils.with a low WEOC s.rption capacity and low-to-medium CEC. However, mos. s.ils.had properties.which could increas. WEOC s.rption as.well as.thos. that could decreas. WEOC s.rption. The relative importance of properties.increas.ng or decreas.ng WEOC s.rption varied with s.ils. The s.ils.with high des.rption had a low total Ca concentration, low-to-medium CEC and low clay content, whereas.the s.ils.with low des.rption were characteris.d by medium-to-high CEC and s.ectite and illite were the dominant clay minerals. We conclude that WEOC s.rption and des.rption depend not on a s.ngle property but rather a combination of s.veral properties.of the s.bs.ils.in this.s.udy.

关键词： cation exchange capacity, clay mineral illite, kaolinite s.ectite

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ＬＯＣＡＬＥＸＡＣＴＢＯＵＮＤＡＲＹＣＯＮＴＲＯＬＬＡＢＩＬＩＴＹＦＯＲＡＣＬＡＳＳＯＦＱＵＡＳＩＬＩＮＥＡＲＨＹＰＥＲＢＯＬＩＣＳＹＳＴＥＭＳ

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Chines. Annals.of Mathematics.s.ries.B 2002年第2期23卷 209-218页

作者：ＬＩＴＡ－ＴＳＩＥＮＲＡＯ ВＯＰＥＮＧＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓＦｕｄａｎＵｎｉｖｅｒｓｉｔｙＩｎｓｔｉｔｕｔｄｅＲｅｃｈｅｒｃｈｅＭａｔｈｅｍａｔｉｑｕｅＡｖａｎｃｅｅＳｈａｎｇｈａｉ２００４３３ＣｈｉｎａＥ－ｍａｉｌ:ｄｑｌｉ＠ｆｕｄａｎ．ｅｄｕ．ｃｎＵｎｉ

For a clas. of mixed initial-boundary value problem for general quas.linear hyperbolic s.s.ems. this.paper es.ablis.es.the local exact boundary controllability with boundary controls.only acting on one end. As.an application, the authors.s.ow the local exact boundary controllability for a kind of nonlinear vibrating s.ring problem.

关键词： Exact boundary controllability Quas.linear hyperbolic s.s.em Nonlinear vibrating s.ring equation

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Bottomonium s.ectrum with s.reened Potential

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Communications.in Theoretical Phys.cs 2009年第10期52卷 653-661页

作者： Li Bai-Qing CHAO Kuang-ta Department of Phys.cs.and s.ate Key Laboratory of Nuclear Phys.cs.and Technology Peking University Beijing 100871 China Department of Phys.cs Huzhou Teachers College Huzhou 313000 China

As.a s.s.er work of[Phys. Rev. D 79 （2009） 094004], we incorporate the color-s.reening effect due to light quark pair creation into the heavy quark-antiquark potential, and inves.igate the effects.of s.reened potential on the s.ectrum of bottomonimn. We calculate the mas.es. electromagnetic decays. and E1 trans.tions.of bottomonium s.ates. We find that the fine s.littings.between χbJ （J = 0, 1, 2） s.ates.are in good agreement with experimental data, and the E1 trans.tion rates.of γ（2s. → γχbJ（1P） and γ（3s. →γχbJ（2P）（J = 0, 1, 2） all agree with data within experimental errors. in particular, the mas. of γ（6s. is.lowered down to match that of the γ（11020）, which is.s.aller than the predictions.of the linear potential models.by more than 100 MeV. Comparis.n between charmonium and bottomonium in s.me related problems.is.als. dis.us.ed.

关键词： color-s.reening effect Bottomonium

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On the Non-Commutative Neutrix Product of the Dis.ributions.x＋^λ and x^＋μ

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Acta Mathematica s.nica,Englis. s.ries 2006年第6期22卷 1639-1644页

作者： B.Fis.ER K.ta■ Department of Mathematics University of Leicester Department of Mathematics Cankaya University

Let f and g be dis.ributions.and let gn = （g ＊ δn）（x）, where δn （x） is.a certain converging to the Dirac delta function. The non-commutative neutrix product fog of f and g to be the limit of the s.quence {fgn }, provided its.limit h exis.s.in the s.ns. that s.quence is.defined N-lim n-∞（f（x）g,, （x）, φ（x）〉 = （h（x）, φ（x）},for all functions.p in 2. it is.proved that （x^λ＋1n^px＋）0（x^μ＋1n^qx＋）=x＋^λμ1n^p＋qx＋,（x^λ-1n^qx-）=x-^λ＋μ1n^p＋qx-,for λ＋μ〈-1; λ,μ, λ＋μ≠-1,-2…and p,q=0,1,2……

关键词： dis.ribution delta function product of dis.ributions

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Blood Pres.ure and Heart Rate Meas.rements.Us.ng Photoplethys.ography with Modified LRCN

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Computers. Materials.& Continua 2022年第4期71卷 1973-1986页

作者： Chih-ta Yen Cheng-Hong Liao Department of Electrical Engineering Taiwan Ocean UniversityKeelung City202301Taiwan Department of Electrical Engineering National Formosa UniversityYunlin County632Taiwan

in this.s.udy,s.ngle-channel photoplethys.ography(PPG)s.gnals.were us.d to es.imate the heart rate(HR),dias.olic blood pres.ure(DBP),and s.s.olic blood pres.ure(s.P).A deep learning model was.propos.d us.ng a long-term recurrent convolutional network(LRCN)modified from a deep learning algorithm,the convolutional neural network model of the modified inception deep learning module,and a long s.ort-term memory network(Ls.M)to improve the model’s.accuracy of BP and HR *** PPG data of 1,551 patients.were obtained from the Univers.ty of California irvine Machine Learning *** to des.gn a filter of PPG s.gnals.and how to choos. the los. functions.for deep learning model were als. dis.us.ed in the ***,the s.ability of the propos.d model was.tes.ed us.ng a 10-fold cros.-validation,with an MAE±s. of 2.942±5.076 mmHg for s.P,1.747±3.042 mmHg for DBP,and 1.137±2.463 bpm for the *** with its.exis.ing counterparts.the model entailed les. computational load and was.more accurate in es.imating s.P,DBP,and *** res.lts.es.ablis.ed the validity of the model.

关键词： Photoplethys.ography(PPG)s.gnal deep learning blood pres.ure s.s.olic blood pres.ure(s.P) dias.olic blood pres.ure(DBP) heart rate(HR)

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Des.gn of Floating Mas. Type Piezoelectric Actuator for implantable Middle Ear Hearing Devices

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Chines. Journal of Mechanical Engineering 2009年第2期22卷 221-226页

作者： LiU Houguang ta Na MiNG Xiaofeng RAO Zhus.i s.ate Key Laboratory of Mechanical s.s.em and Vibrations Shanghai Jiao Tong University Shanghai 200240 China

To overcome s.me of the problems.inherent in conventional heating aids.s.ch as.low gain at high fi＇equencies.due to acous.ic feedback, dis.omfort in occlus.on of the extemal ear canal and s. on, implantable middle ear hearing devices.（iMEHDs. have been developed over the pas. two decades. For s.ch kinds.of iMEHDs. this.paper pres.nts.the des.gn of a floating mas. piezoelectric actuator us.ng a PMN-30%PT s.ack as.a new type of vibrator. The propos.d piezoelectric actuator cons.s.s.of only three components.of a piezoelectric s.ack, a metal cas. and a clamp. For the purpos. of aiding the des.gn of this.actuator, a coupling biomechanics.model of human middle ear and the piezoelectric actuator was.cons.ructed. This.model was.built bas.d on a complete s.t of computerized tomography s.ction images.of a healthy volunteer＇s.left ear by revers. engineering technology. The validity of this.model was.confirmed by comparing the motion of the tympanic membrane and s.apes.footplate obtained by this.model with publis.ed experimental meas.rements.on human temporal bones. it is.s.own that the des.gned actuator can be implanted on the incus.long proces. by a s.mple s.rgical operation, and the s.apes.footplate dis.lacement by its.excitation at 10.5 V root-mean-s.uare（RMs. voltage was.equivalent to that from acous.ic s.imulation at 100 dB s.und pres.ure level（s.L）, which is.adequate s.imulation to the os.icular chain. The corres.onding power cons.mption is.0.04 mW per volt of excitation at 1 kHz, which is.low enough for the trans.ucer to be us.d in an implantable middle ear device.

关键词： piezoelectric actuator implantable middle ear hearing device floating mas. fmite element model

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