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Developments and research directions in pipe jacking and microtunneling

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Underground Space 2020年第1期5卷 1-19页

作者： raymond l.Sterling louisiana Tech University RustonLouisiana 71272USA

This paper provides a review of the history and development of pipe jacking and microtunneling methods with extensive referencing to the published *** application of such methods in comparison with other trenchless technologies is discussed and the various planning,design and construction aspects are *** emphasis of the paper is to trace the academic research and field monitoring results covering critical aspects of design and construction with a particular emphasis on jacking force estimation and the effect of lubrication on jacking forces.

关键词： Pipe jacking Microtunneling Design Construction Research Review

Strain control of layer-resolved negative capacitance in superlattices

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npj Computational Materials 2020年第1期6卷 127-130页

作者： raymond Walter Sergey Prosandeev Charles Paillard l.Bellaiche Department of Physics and Institute for Nanoscience and Engineering University of ArkansasFayettevilleAR 72701USA Department of Mathematical Sciences University of ArkansasFayettevilleAR 72701USA Identity Engineering Kinesso LLCConwayAR 72032USA Institute of Physics and Physics Department of Southern Federal University Rostov-na-Donu 344090Russia laboratoire Structures Propriétés et Modélisation des SolidesCentraleSupélecUMR CNRS 8580UniversitéParis-Saclay91190 Gif-sur-YvetteFrance

Negative capacitance in BaTiO_(3)/SrTiO_(3) superlattices is investigated by Monte Carlo simulations in an atomistic effective Hamiltonian model,using fluctuation formulas for responses to the local macroscopic field that incorporates depolarizing *** show that epitaxial strain can tune the negative capacitance of the BaTiO_(3) ferroelectric layer and the overall capacitance of the *** addition,we predict and explain an original switching of the negative capacitance from the BaTiO3 layer to the SrTiO_(3) layer at low temperatures for intermediate strains.

关键词： capacitance layer resolved

Deterministic Dual Control of Phase Competition in Strained BiFeO_(3):A Multiparametric Structural lithography Approach

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Nanomanufacturing and Metrology 2022年第1期5卷 60-66页

作者： Nathan Black David Edwards Niall Browne Joseph G.M.Guy Niyorjyoti Sharma Kristina M・Holsgrove Aaron B.naden raymond G.P.McQuaid Brian J.Rodriguez Amit Kumar School of Maths and Physics Queen's University BelfastBelfast BT7 INNUK School of Chemistry University of St.AndrewsSt Andrews KY169STUK School of Physics University College DublinBelfieldDublin 4Ireland

The realization of a mixed-phase microstructure in strained BiFeO_(3)(BFO)thin films has led to numerous novel effects derived from the coexistence of the tetragonal-like monoclinic phase(T phase)and rhombohedral-like monoclinic phase(R phase).Strong strain and polarization diiferences between the phases should result in a high level of transformation plasticity,which enables the continuous alteration of the relative proportion of R and T states in response to external *** the potential for utilizing such plasticity to control mixed-phase populations under external stimuli is evident,direct experi・mental evidence backed by equilibrium predictions has not yet been fully *** we demonstrate deterministic control of mixed-phase populations in an epitaxially strained BFO thin film through the application of localized stresses and electric fields in a reversible manne匚The results illustrate and rationalize deterministic control of mixed phases in strained BFO films,which could be crucial in tuning their functional *** findings also highlight a new multiparametric technique in the scanning probe lithography toolbox based on tip-assisted electric and strain field manipulation of functional properties that might find application beyond the ferroelectric domain and structural phase lithography.

关键词： Phase competition Ferroelectric Stress lithography

2010年类风湿关节炎分类标准——美国风湿病学会和欧洲抗风湿病联盟的联合倡议

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2010年类风湿关节炎分类标准——美国风湿病学会和欧洲抗风湿病联...

land use legacy for a tropical myco-heterotroph: how spatial patterns of abundance, reproductive effort and success vary

贵州省医学会风湿病学分会第四届学术年会

作者： Daniel Aletaha Tuhina Neogi Alan J Silman Julia Funovits David T Felson Clifton O Bingham Ⅲ Neal S Birnbaum Gerd R Burmester Vivian P Bykerk Marc D Cohen Bernard Combe Karen H Costenbader Maxime Dougados Paul Emery Gianfranco Ferraccioli Johanna MW Hazes Kathryn Hobbs Tom WJ Huizinga Arthur Kavanaugh Jonathan Kay Tore K Kvien Timothy laing Philip Mease Henri A Menard larry W Moreland raymond l naden Theodore Pincus Josef S Smolen Ewa Stanislawska-Biernat Deborah Symmons Paul P Tak Katherine S Upchurch Jiri Vencovsky Frederick Wolfe Gillian Hawker 季兰岚邓雪蓉赵明田真张卓莉 Medical University of Vienna ViennaAustria Boston University School of Medicine BostonMassachusettsUSA

目的 :在早期类风湿关节炎(rheumatoid arthritis,RA)的诊断中,1987年美国风湿病学会(AmericanCollege of Rheumatology,ACR;旧称AmericanRheumatism Association,ARA)的诊断标准因为缺乏敏感度而受到质疑。本研究的目的是建立新的RA分类标准。方法 :由ACR和欧洲抗风湿病联盟(Europeanleague Against Rheumatism,EUlAR)共同组成的工作小组,分三个阶段建立RA新的分类标准。研究的目标人群是初发的未分化关节炎患者,主要研究目的是寻找能够预测这些病人发展为RA的危险因素,并将RA疾病特点定义为持续性和/或侵蚀性关节炎。结果 :在新的分类标准中,确诊RA至少需要一个关节有明确的滑膜炎表现,除外其他可能导致滑膜炎症的疾病,同时以下四项评分的总分≥6分(最高10分):受累关节的数量和部位(0-5分)、血清学自身抗体异常(0-3分)、急性期反应物升高(0-1分)和症状持续时间(共分两级;0-1分)。结论 :既往诊断RA比较依赖骨破坏这一RA晚期表现,而新的分类标准着重于疾病早期表现而不是晚期特点,将疾病特点重新定义为持续性和/或侵蚀性滑膜炎。这一新标准的推出将再次强调了RA早期诊断的必要性以及早期有效治疗对于预防或减少不良后遗症的发生具有重要意义。

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Journal of Plant Ecology 2019年第2期12卷 367-375页

作者： Stephen McAuliffe James D.Ackerman raymond l.Tremblay Department of Environmental Science Humboldt State UniversityArcataCAUSA Center for Applied Tropical Ecology and Conservation University of Puerto RicoSan JuanPRUSA Department of Biology University of Puerto Rico17 Ave Universidad Suite 1701San JuanPR 00925-2537USA Department of Biology University of Puerto RicoHumacaoPRUSA

Aims Human land use such as agriculture and logging can have cascad-ing effects on the environment and severely influence forest eco-systems by altering structure,species composition and community *** activities may have long-term consequences,which impact forest *** investigated the legacy of his-torical anthropogenic land use on the current reproductive effort(RE)and success of the understory,myco-heterotrophic orchid,Wullschlaegelia calcarata in Puerto Rico’s tropical rain forest after 80 years of forest *** Our study site was the 16-ha luquillo Forest Dynamics Plot in the luquillo Experimental *** used six 10 m×500 m transect lines that spanned areas with differing levels of historic canopy coverage which are correlated with land use *** recorded the abundance of *** plants and measured shoot height,number of flowers,fruit set for all plants and seed set from the most mature,undehisced fruit on a random subset of plants *** sought to determine whether or not there is a legacy of land use history on the RE and success of *** the varying degrees of historic disturbance,we predicted that RE and success would be highest in minimally disturbed old-growth forest,and that soil type differences would be insufficient to affect RE or *** Findings We found 1607 plants of ***,and only one was detected in the most historically disturbed area of the *** orchids were most abundant in the two least historically disturbed ***,the prevailing trend in all measures of RE is in the opposite direction with greater RE in the forest plots with intermediate levels of histori-cal ***,the best model(as a function of AICc and weights)to predict RE is a combination of soil type and cover ***,our measures of reproductive success(fruit and seed set)were best in the least historically disturbed sites and were not associated with soil ***,the b

关键词： forest recovery Orchidaceae tropical forest disturbance ecology Wullschlaegelia

Direct ink writing to fabricate porous acetabular cups from titanium alloy

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Bio-Design and Manufacturing 2023年第2期6卷 121-135页

作者： Naima Valentin Weijian Hua Ashish K.Kasar lily raymond Pradeep l.Menezes Yifei Jin Mechanical Engineering Department University of NevadaRenoRenoNV 89557USA

Acetabular cups,which are among themost important implants in total hip arthroplasty,are usually made from titanium alloys with high porosity and adequate mechanical *** current three-dimensional(3D)printing approaches to fabricate customized acetabular cups have some inherent disadvantages such as high cost and energy consumption,residual thermal stress,and relatively low ***,in this work,a direct ink writing method was developed to print a cup structure at room temperature,followed by multi-step heat treatment to form microscale porous structure within the acetabular *** method is facilitated by the development of a self-supporting titanium-6 aluminum-4 vanadium(Ti64)ink that is composed of Ti64 particles,bentonite yield-stress additive,ultraviolet curable polymer,and *** effects of Ti64 and bentonite concentrations on the rheological properties and printability of inks were systematically ***,the printing conditions,geometrical limitations,and maximum curing depth were ***,some complex 3D structures,including lattices with different gap distances,honeycomb with a well-defined shape,and an acetabular cup with uniformly distributed micropores,were successfully printed/fabricated to validate the effectiveness of the proposed method.

关键词： Acetabular cup Direct ink writing Titanium alloy Bentonite Heat treatment

Towards real-time detection of wastewater in surface waters using fluorescence spectroscopy

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Journal of Environmental Sciences 2019年第12期31卷 195-202页

作者： Ye Z.Yang Nicolas M.Peleato raymond l.legge Robert C.Andrews Department of Ciuil and Mineral Engineering University of Toronto35 St.George St.TorontoOntario M5S 1A4Canada School of Engineering Uniuersity of British Columbia Okanagan1137 Alwmni AueKeloiunaBritish Columbia V1V 1V7Canada Department of Chemical Engineering University of Waterloo200 University Ave.WWaterlooOntario N2L 3G1Canada

The presence of municipal wastewater at the intake of a major drinking water treatment facility located on lake Ontario was examined using fluorescence data collected during a period of continuous *** addition,controlled mixing of lake water and wastewater sampled from a local treatment facility were conducted using a bench-scale fluorescence system to quantify observed changes in natural organic *** linear regression was applied to components derived from parallel factors *** resulting mean absolute error for predicted wastewater level was 0.22%(V/V,wastewater/lake water),indicating that wastewater detection at below 1.0%(V/V)was *** of sucralose,a wastewater indicator,were conducted for treated wastewater as well as surface water collected at two intake locations on lake *** suggested minimal wastewater contribution at the drinking water intake.A wastewater detection model using a moving baseline was developed and applied to continuous fluorescence data collected at one of the drinking water intakes,which agreed well with sucralose ***,the simulated addition of 1.0%(V/V)of wastewater/wastewater was detectable in 89%of samples analyzed,demonstrating the utility of fluorescence-based wastewater monitoring.

关键词： Excitation emission matrices Parallel factors analysis Natural organic matter Source water monitoring Wastewater impact Water quality assessment

Active Matter, Microreversibility, and Thermodynamics

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Research 2020年第1期2020卷 1921-1940页

作者： Pierre Gaspard raymond Kapral Center for Nonlinear Phenomena and Complex Systems UniversitéLibre de Bruxelles(U.L.B.)Code Postal 231Campus PlaineB-1050 BrusselsBelgium Chemical Physics Theory Group Department of ChemistryUniversity of TorontoTorontoOntarioCanada M5S 3H6

Active matter,comprising many active agents interacting and moving in fluids or more complex environments,is a commonly occurring state of matter in biological and physical *** its very nature,active matter systems exist in nonequilibrium *** this paper,the active agents are small Janus colloidal particles that use chemical energy provided by chemical reactions occurring on their surfaces for propulsion through a diffusiophoretic *** a result of interactions among these colloids,either directly or through fluid velocity and concentration fields,they may act collectively to form structures such as dynamic clusters.A general nonequilibrium thermodynamics framework for the description of such systems is presented that accounts for both self-diffusiophoresis and diffusiophoresis due to external concentration gradients,and is consistent with *** predicts the existence of a reciprocal effect of diffusiophoresis back onto the reaction rate for the entire collection of colloids in the system,as well as the existence of a clustering instability that leads to nonequilibrium inhomogeneous system states.

关键词： mechanism nonequilibrium system

Fluxes of water,sediments,and biogeochemical compounds in salt marshes

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Ecological Processes 2013年第1期2卷 26-41页

作者： Sergio Fagherazzi Patricia l Wiberg Stijn Temmerman Eric Struyf Yong Zhao Peter A raymond Department of Earth and Environment Boston UniversityBostonMAUSA. Department of Environmental Sciences University of VirginiaCharlottesvilleVAUSA. Department of Biology Ecosystem ManagementresearchgroupUniversity of AntwerpenAntwerpenBelgium School of Forestry&Environmental Studies Yale UniversityNew HavenCTUSA.

Tidal oscillations systematically flood salt marshes,transporting water,sediments,organic matter,and biogeochemical elements such as *** we present a review of recent studies on these fluxes and their effects on both ecosystem functioning and morphological evolution of salt *** reexamine a simplified model for the computation of water fluxes in salt marshes that captures the asymmetry in discharge between flood and *** discuss the role of storm conditions on sediment fluxes both in tidal channels and on the marsh *** present recent methods and field instruments for the measurement of fluxes of organic *** methods will provide long-term data sets with fine temporal resolution that will help scientists to close the carbon budget in salt ***,the main processes controlling fluxes of biogenic and dissolved silica in salt marshes are explained,with particular emphasis on the uptake by marsh macrophytes and diatoms.

关键词： flood tidal storm