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Single-molecule DNA sequencing using two-dimensionalTi2C(OH)2 MXene nanopores: A first-principles investigation

Nano Research 2022年第11期15卷 9843-9849页

作者： Jariyanee Prasongkit Sirichok Jungthawan rodrigo G.Amorim Ralph H.Scheicher Division of Physics Faculty of ScienceNakhon Phanom UniversityNakhon Phanom 48000Thailand School of Physics Institute of ScienceSuranaree University of Technology111 University AveNakhon Ratchasima 30000Thailand Center of Excellence in Advanced Functional Materials Suranaree University of TechnologyNakhon Ratchasima 30000Thailand Thailand Center of Excellence in Physics Ministry of Higher EducationScienceResearch and Innovation328 Si Ayutthaya RoadBangkok 10400Thailand Departamento de Física ICExUniversidade Federal Fluminense-UFFVolta Redonda/RJ 27213-145Brazil Division of Materials Theory Department of Physics and AstronomyUppsala UniversityUppsala SE-75120Sweden

Nanopore-based devices have provided exciting opportunities to develop affordable label-free DNA sequencing *** a decade ago,graphene has been proposed as a two-dimensional(2D)nanopore membrane in order to achieve single-base ***,it was experimentally revealed that clogging of the graphene nanopore can occur due to the hydrophobic nature of graphene,thus hindering the translocation of *** overcome this problem,the exploration of alternative 2D materials has gained considerable interest over the last *** we show that a Ti_(2)C-based MXene nanopore functionalized by hydroxyl groups(–OH)exhibits transverse conductance properties that allow for the distinction between all four naturally occurring DNA *** have used a combination of density functional theory and non-equilibrium Green’s function method to sample over multiple orientations of the nucleotides in the nanopore,as generated from molecular dynamics *** conductance variation resulting from sweeping an applied gate voltage demonstrates that the Ti_(2)C-based MXene nanopore possesses high potential to rapidly and reliably sequence *** findings open the door to further theoretical and experimental explorations of MXene nanopores as a promising 2D material for nanopore-based DNA sensing.

关键词： nanopore DNA sequencing MXenes first-principles quantum transport

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Bitcoin pricing: impact of attractiveness variables

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Financial Innovation 2020年第1期6卷 373-391页

作者： rodrigo Hakim das Neves Sao Paulo School Of Economics(FGV) Sao PauloBrazil

The research seeks to contribute to Bitcoin pricing analysis based on the dynamics between variables of attractiveness and the value of the digital *** the error correction model,the relationship between the price of the virtual currency,Bitcoin,and the number of Google searches that used the terms bitcoin,bitcoin crash and crisis between December 2012 and February 2018 is *** study also applied the same analysis to prices of Bitcoin denominated in different sovereign currencies traded during the same *** Johansen(J Econ Dyn Control 12:231-254,1988)test demonstrates that the price and number of searches on Google for the first two terms are *** research indicates that there are strong short-term and long-term dynamics among attractiveness factors,suggesting that an increase in worldwide interest in Bitcoin is usually preceded by a price *** contrast,an increase in market mistrust over a collapse of the currency,as measured by the term bitcoin crash,is followed by a fall in *** world economic crisis events appear to have a strong impact on interest in the virtual *** study demonstrates that during a worldwide crisis Bitcoin becomes an alternative investment,increasing its *** on it,bitcoin may be used as a safe haven by the financial market and its intrinsic characteristics might help the investors and governments to find new mechanisms to deal with monetary transactions.

关键词： Bitcoin pricing Price variables Crisis

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Thermoregulatory function and sexual dimorphism of the throat sack in Helmeted Guineafowl(Numida meleagris)across Africa

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Avian Research 2022年第3期13卷 239-248页

作者： Johann H.Van Niekerk rodrigo Megía-Palma Giovanni Forcina Department of Environmental Sciences College of Agriculture and Environmental SciencesUniversity of South AfricaP.O.Box 392Pretoria0003South Africa Universidad de Alcal a(UAH) Department of Biomedicine and BiotechnologySchool of PharmacyA-2 Highwaykm 33.60028805Alcal a de HenaresMadridSpain Universidad de Alcal a(UAH) Global Change Ecology and Evolution Research Group(GloCEE)Departamento de Ciencias de la Vida28805Alcal a de HenaresMadridSpain CIBIO Centro de Investigaç~ao em Biodiversidade e Recursos Gen eticosInBIO Laborat orio AssociadoCampus de Vair~aoUniversidade do Porto4485-661Vair~aoPortugal BIOPOLIS Program in Genomics Biodiversity and Land PlanningCIBIOCampus de Vair~ao4485-661Vair~aoPortugal

The responses of ground-dwelling birds to heat and cold stress encompass a variety of behavioural,physiological and even morphological ***,the role of glabrous skin in this respect has been marginally addressed so *** Helmeted Guineafowl(Numida meleagris)is a landfowl distributed across Sub-Saharan Africa with eight traditionally recognised extant *** the most prominent morphological traits underlying intraspecific variability are size and pigmentation of the bare throat skin(or sack),which might be related to the different habitats and environmental conditions across its wide *** order to explore the Helmeted Guineafowl range-wide sack variation and pigmentation in relation to thermoregulation and sexual signalling,we collected morphometric and environmental information for *** integrating field data with the inspection of photographic material encompassing seven subspecies and environmental information from their *** data evidenced that sack size was significantly correlated with ambient temperature,thus pointing to a likely involvement of the throat sack in *** the pictorial data from all subspecies were pooled,sack size correlated negatively with biomass,rainfall and humidity,while a positive correlation was found with annual solar *** size correlated positively with monthly temperature variation among the bluethroated subspecies from southern Africa as opposed to the black-throated subspecies ranging north to Zambia and ***,in this latter group the sack was often larger during winter months,possibly to maximise solar radiation ***,sack size was related to sex dimorphism in two *** morphology and colour in the Helmeted Guineafowl likely modulate body temperature by evaporative cooling or heating upon needs,but in some subspecies it is also seemingly related to sexual *** studies are needed to fully understand the mu

关键词： Evaporative cooling Helmeted guineafowl Sexual size dimorphism Sub-Saharan Africa Thermoregulation Throat sack

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Experimental study on fly ash capture mercury in flue gas

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Science China(Technological Sciences) 2010年第4期53卷 976-983页

作者： Mercedes DíAZ-SOMOANO Patricia ABAD-valle M.Rosa MARTíNEZ-TARAZONA Instituto Nacional del Carbón(CSIC)

Systematic experiments were conducted on a fixed-bed reactor to investigate the interaction between fly ash and mercury,the results implied that fly ash can capture mercury *** different fly ashes,the unburned carbon in the FA2 and FA3 fly ashes has the highest mercury capture capacity,up to 10.3 and 9.36 μg/g,respectively,which is close to that of commercial activated *** is no obvious relationship between mercury content and carbon content or BET surface area of fly *** classification standard was applied to distinguish fly ash carbon *** content is not the only variable that controls mercury capture on fly ash,there are likely significant differences in the mercury capture capacities of the various carbon *** capture capacity mainly depends on the content of anisotropy carbon particles with porous network structure.

关键词： mercury fly ash unburned carbon petrography adsorption

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Complementary Methods to Acquire the Kinematics of Swimming Snakes:A Basis to Design Bio-inspired Robots

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Journal of Bionic Engineering 2023年第2期20卷 668-682页

作者： Elie Gautreau Xavier Bonnet Tom Fox Guillaume Fosseries Valéry valle Anthony Herrel Med Amine Laribi Department of GMSC University of PoitiersISAE-ENSMACNRSPPRIME UPR 3346PoitiersFrance CEBC Center for Biological Studies of Chizé CNRS and University of la RochelleVilliers en BoisFrance MNHN National Museum of Natural History CNRSParisFrance

The vast diversity of morphologies,body size,and lifestyles of snakes represents an important source of information that can be used to derive bio-inspired robots through a biology-push and pull *** understanding of the detailed kinematics of swimming snakes is a fundamental prerequisite to conceive and design bio-inspired aquatic snake ***,only limited information is available on the kinematics of swimming *** and accurate methods are needed to fill this knowledge *** the present paper,three existing methods were compared to test their capacity to characterize the kinematics of swimming snakes.(1)Marker tracking(Deftac),(2)Markerless pose estimation(DeepLabCut),and(3)Motion capture were considered.(4)We also designed and tested an automatic video processing *** methods provided different albeit complementary data sets;they also involved different technical issues in terms of experimental conditions,snake manipulation,or processing *** tracking provided accurate data that can be used to calibrate other *** capture posed technical difficulties but can provide limited 3D *** pose estimation required deep learning(thus time)but was efficient to extract the data under various experimental ***,automatic video processing was particularly efficient to extract a wide range of data useful for both biology and robotics but required a specific experimental setting.

关键词： Locomotion Image processing Motion capture Kinematic analysis Snake robot Biomimicry DeepLabCut

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Identifiability and Stability of an Inverse Problem Involving a Fredholm Equation

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Chinese Annals of Mathematics,Series B 2015年第5期36卷 737-762页

作者： Carlos CONCA rodrigo LECAROS Jaime H.ORTEGA Lionel ROSIER Centro de Modelamiento Matematico and Departamento de Ingenier?a Matematica Universidad de Chile (UMI CNRS 2807) Avda Beauchef 851 Edificio Norte Casilla 170-3 Correo 3 Santiago 8370459Chile Centre Automatique et Systemes MINES Paris Tech PSL Research University

The authors study a linear inverse problem with a biological interpretation,which is modelled by a Fredholm integral equation of the first kind, where the kernel is represented by step functions. Based on different as... 详细信息

关键词： Inverse problems Olfactory system Kernel determination Fredholm integral equation Partial differential equations Numerical reconstruction

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Availability-based simulation and optimization modeling framework for open-pit mine truck allocation under dynamic constraints

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International Journal of Mining Science and Technology 2013年第1期23卷 113-119页

作者： Mena rodrigo Zio Enrico Kristjanpoller Fredy Arata Adolfo European Foundation for New Energy-Electricity of France at Central School of Paris-Supelec Paris 92295 France Energy Department Polytechnic of Milan Milan 20133 Italy Department of Industrial Engineering Federico Santa Maria Technical University Valparaiso 2390123 Chile Industrial Engineering School Pontifical Catholic University of Valparaiso Valparaiso 2340025 Chile

We present a novel system productivity simulation and optimization modeling framework in which equipment availability is a variable in the expected productivity function of the system. The framework is used for allocating trucks by route according to their operating performances in a truck-shovel system of an open-pit mine, so as to maximize the overall productivity of the fleet. We implement the framework in an originally designed and specifically developed simulator-optimizer software tool. We make an application on a real open-pit mine case study taking into account the stochasticity of the equipment behavior and environment. The total system production values obtained with and without considering the equipment reliability, availability and maintainability (RAM) characteristics are compared. We show that by taking into account the truck and shovel RAM aspects, we can maximize the total production of the system and obtain specific information on the production availability and productivity of its components.

关键词： Simulation Optimization Reliability Productivity Open-pit Truck allocation

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ON THE VALIDITY OF THE LOCAL FOURIER ANALYSIS

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Journal of Computational Mathematics 2019年第3期37卷 340-348页

作者： Carmen rodrigo Francisco J.Gaspar Ludmil T.Zikatanov Departamento de Matematica Aplicada IUMAUniversidad de ZaragozaZaragozaSpain CWI Centrum Wiskunde & InformaticaScience Park 1231090 AmsterdamThe Netherlands Department of Mathematics The Pennsylvania State UniversityUniversity ParkPennsylvania 16802USAInstitute for Mathematics and InformaticsBulgarian Academy of SciencesSofia.Bulgaria

Local Fourier analysis(LFA)is a useful tool in predicting the convergence factors of geometric multigrid methods(GMG).As is well known,on rectangular domains with periodic boundary conditions this analysis gives the exact convergence factors of such met *** other boundary conditions are considered,however,this analysis was judged as been heuristic,with limited capabilities in predicting multigrid convergence *** this work,using the Fourier method,we extend these results by proving that such analysis yields the exact convergence factors for a wider class of problems,some of which can not be handled by the traditional rigorous Fourier analysis.

关键词： Local Fourier analysis Multigrid Fourier method

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Catalytic combustion of soot over ceria-zinc mixed oxides catalysts supported onto cordierite

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Journal of Environmental Sciences 2014年第3期26卷 694-701页

作者： Leandro Fontanetti Nascimento Renata Figueredo Martins rodrigo Ferreira Silva Osvaldo Antonio Serra Department of Chemistry FFCLRP University of Sao Paulo

Modified substrates as outer heterogeneous catalysts was employed to reduce the soot generated from incomplete combustion of diesel or diesel/biodiesel blends, a process that harms the environment and public health. The unique storage properties of ceria （CeO2） makes it one of the most efficient catalysts available to date. Here, we proposed that ceria-based catalysts can lower the temperature at which soot combustion occurs; more specifically, from 610℃ to values included in the diesel exhausts operation range （300-450℃）. The sol-gel method was used to synthesize mixed oxide-based catalysts （CeO2：ZnO）; the resulting catalysts were deposited onto cordierite substrates. In addition, the morphological and structural properties of the material were evaluated by XRD, BET, TPR-H2, and SEM. Thermogravimetric （TG/DTA） analysis revealed that the presence of the catalyst decreased the soot combustion temperature by 200℃ on average, indicating that the oxygen species arise at low temperatures in this situation, promoting highly reactive oxidation reactions. Comparative analysis of soot emission by diffuse reflectance spectroscopy （DRS） showed that catalyst-impregnated cordierite samples efficiently oxidized soot in a diesel/biodiesel stationary motor： soot emission decreased by more than 70%.

关键词： soot oxidation mixed oxides ceria

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Water and nutrient and energy systems in urbanizing watersheds

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Frontiers of Environmental Science & Engineering 2012年第5期6卷 596-611页

作者： rodrigo VILLARROEL WALKER Michael Bruce BECKl, Jim W. HALL Warnell School of Forestry & Natural Resources University of Georgia Athens GA 30602-2152 USA Environmental Change Institute University of Oxford Oxford University Centre for the Environment South Parks Road Oxford OXI 3QY UK

Driven by considerations of sustainability, it has become increasingly difficult over the past 15-20 years -- at least intellectually -- to separate out the water infrastructure and water metabolism of cities from their intimately inter-related nutrient and energy metabolisms. Much of the focus of this difficulty settles on the wastewater component of the city＇s water infrastructure and its associated fluxes of nutrients （N, P, C, and so on）. Indeed, notwithstanding the massive volumes of these materials flowing into and out of the city, the notion of an urban nutrient infrastructure is conspicuous by its absence. Likewise, we do not tend to discuss, or conduct research into, ＂soilshed＂ agencies, or soilshed management, or Integrated Nutrient Resources Management （as opposed to its most familiar companion, Integrated Water Resources Management, or IWRM）. The paper summarizes some of the benefits （and challenges） deriving from adopting this broader, multi-sectoral ＂systems＂ perspective on addres- sing water-nutrient-energy systems in city-watershed settings. Such a perspective resonates with the growing interest in broader policy circles in what is called the ＂water-food-energy security nexus＂. The benefits and challenges of our Multi-sectoral Systems Analysis （MSA） are illustrated through computational results from two primary case studies： Atlanta, Georgia, USA; and London, UK. Since our work is part of the International Network on Cities as Forces for Good in the Environment （CFG; see ***）, in which other case studies are currently being initiated -- for example, on Kath- mandu, Nepal we close by reflecting upon these issues of water-nutrient-energy systems in three urban settings with quite different styles and speeds of development.

关键词： cities climate change energy sector nutrientsector systems analysis resource recovery water-food-energy security

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