检索结果-南通市图书馆

Beyond COVID: Reframing the Global Problematique with STiP (Systems Thinking in Practice)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2023年第1期32卷 1-15页

作者： raymond l.Ison IFSR(International Federation for Systems Research)&Applied Systems Thinking in Practice(ASTiP)Group School of Engineering&InnovationThe Open UniversityWalton HallUK

Since 2019 humanity has been subjected to the perturbations of pandemic,economic disruption,war,civil unrest and changes in whole-Earth dynamics associated with a human-induced *** perturbation is like a wave-front breaking on the shore of our historical ways of thinking and acting,increasingly unfit for our human *** challenge to humanity is not *** 1970 the French term‘problematique’was coined to refer to a set of 49 interrelated global problems;the classic description of wicked and tame problems was published soon after,yet little progress has been made towards answering the question:what purposeful action will aid human flourishing,create and sustain a viable space for humanity,in our ongoing co-evolution with the Anthropocene-Biosphere?A case for innovation in our ways of knowing and doing is made based on arguments that our social world is constrained by:(i)explanations we accept that are no longer relevant to our circumstances;(ii)outdated historical institutions(in the institutional economics sense)that contribute as social technologies to a broader human created and ungoverned technosphere;(iii)inadequate theory-informed practices,or praxis,and(iv)governance-systems no longer adequate for *** of knowledge science and systems science are urged to act reflexively to critically evaluate the traditions-of-understanding out of which they think and act.

关键词： Cybersystemics governance systems reframing and framing critical social learning system

Developments and research directions in pipe jacking and microtunneling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

维普期刊数据库

Flow behavior and deposition study of pollen-shape carrier particles in an idealized inhalation path model

在线全文

学校读者我要写书评

暂无评论

Particuology 2010年第1期8卷 51-59页

作者： Meer Saiful Hassan raymond lau School of Chemical and Biomedical Engineering (SCBE) Nanyang Technological University (NTU)

Pollen-shape （spiked sphere） hydroxyapatite （HA） particles for drug carrier application are studied. The particle shape and size effect on flow characteristics and deposition are assessed. The pollen-shape HA particles are synthesized to have comparable size as typical carrier particles with mean diameter of 30-50 μm and effective density less than 0.3 g/cm^3. The flow behaviors of HA and commonly used lactose （lA） carrier particles are characterized by the Carr＇s compressibility index （CI）. The HA particles have lower CI than the lA particles for the same size range. The flow fields of HA and lA carrier particles are measured in an idealized inhalation path model using particle image velocimetry （PlY） technique. The particle streamlines indicate that a large portion of particles may deposit at the bending section due to inertial impaction and gravitational deposition. The flow field result shows that HA particles give smaller separation regions than the lA particles for the same size range. The pollen-shape HA particles are found to be able to follow the gas flow in the model and minimize undesired deposition. Deposition result confirms the bending section to have the most deposition. Deposition is found to be a function of particle properties. An empirical correlation is derived for the deposition efficiency of the pollen-shape particles as a function of particles Stokes number.

关键词： Aerosol Fluid mechanics Multiphase flow Particle Powder technology Pulmonary drug delivery

维普期刊数据库

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

在线全文

学校读者我要写书评

暂无评论

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

维普期刊数据库

Energy model based on solar potential and the production of electrical energy through living plants’photosynthesis

在线全文

学校读者我要写书评

暂无评论

Clean Energy 2024年第3期8卷 116-126页

作者： raymond Daniel Rodriguez Martinez Department of Industrial Production Faculty of EngineeringUniversidad Metropolitana1073 CaracasVenezuela

Developing a sustainable energy model is imperative considering the current trend towards decarbonizing sectors *** this purpose,Venezuela was used as a reference to propose an energy model focused on taking advantage of plant photosynthesis through microbial-vegetable fuel cells together with an agro-photovoltaic system to enhance energy and agricultural *** production from the cells was estimated using an average power density of 264 mW/m^(2) over 4%of the areas destined for crops in the entire Venezuelan region,obtaining an annual production of 19.889 GWh/*** contrast,the energy production of the agro-photovoltaic system was modelled using PVsyst software on 50%of the area used for the cells distributed throughout the states of Anzoátegui,Guárico,Monagas and Portuguesa according to their meteorological conditions,solar irradiation and agricultural activity,resulting in 3703417 GWh/*** resulting whole system proved to be able to cover>10 times the installed electricity generation capacity at a national level and,together with the tremendous scalability of the microbial fuel cells,it shows that Venezuela has a high potential for the production and distribution of clean energy.

关键词： ecosystems microbial fuel cell microorganisms renewable sustainability

Active Matter, Microreversibility, and Thermodynamics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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