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Synthetic Time Series Generation Model for Analysis of Power System Operation and Expansion with High Renewable Energy Penetration

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Journal of Modern Power Systems and Clean Energy 2021年第4期9卷 849-858页

作者： rodrigo Palma-Behnke Jorge Vega-Herrera Felipe Valencia Oscar Nunez-Mata Energy Center Department of Electrical EngineeringFaculty of Mathematical and Physical SciencesUniversity of ChileSantiagoChile Department of Electrical Engineering University of AntofagastaAntofagastaChile School of Electrical Engineering University of Costa RicaSan PedroCosta Rica

The increasing integration of renewable energy sources into current power systems has posed the challenge of adequately representing the statistical properties associated with their variable power generation. In this paper, a novel procedure is proposed to select a proper synthetic time series generation model for renewable energy sources to analyze power system problems. The procedure takes advantage of the objective of the specific analysis to be performed and the statistical characteristics of the available time series. The aim is to determine the suitable model to be used for generating synthetic time series of renewable energy sources. A set of indicators is proposed to verify that the statistical properties of synthetic time series fit the statistical properties of the original data. The proposal can be integrated into systematic tools available for data analysis without compromising the representation of the statistical properties of the original time series. The procedure is tested using real data from the New Zealand power system in a mid-term analysis on integrating wind power plants into the power system. The results show that the proposed procedure reduces the error obtained in analyzing power systems compared with reference models.

关键词： Time series analysis renewable energy source solar energy stochastic process statistical analysis wind energy

Scrub typhus:pathophysiology,clinical manifestations and prognosis

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Asian Pacific Journal of Tropical Medicine 2012年第4期5卷 261-264页

作者： Senaka Rajapakse Chaturaka rodrigo Deepika Fernando Department of Clinical Medicine Faculty of Medicine25 Kynsey RoadColombo 8Sri Lanka Department of Parasitology Faculty of Medicine25 Kynsey RoadColombo 8Sri Lanka

Scrub typhus is a zoonosis caused by the pathogen Orientia tsutsugamushi(***). The disease has significant prevalence in eastern and Southeast *** presenting as an acute febrile illness,the diagnosis is often missed because of similarities with oilier tropical febrile *** unusual manifestations are present,and these are described in this review,together with an outline of current knowledge of *** of these unusual clinical manifestations will help the clinician to arrive at an early diagnosis,resulting in early administration of appropriate *** indicators for severe disease have not yet been clearly established.

关键词： Scrub typhus Orientia tsutsugamushi Clinical manifestations

Chemoprophylaxis in malaria:drugs,evidence of efficacy and costs

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Asian Pacific Journal of Tropical Medicine 2011年第4期4卷 330-336页

作者： Sumadhya Deepika Fernando Chaturaka rodrigo Senaka Rajapakse Department of Parasitology Faculty of Medicine University Medical Unit National Hospital of Sri Lanka Department of Clinical Medicine Faculty of Medicine

This review concentrates on different aspects of malaria chemoprophylaxis,namely drug combinations,resistance,impact of malaria prevention in pregnancy and cost effectiveness. A MEDLINE search was performed for all articles with the key word ’Malaria’ in the title field and ’Prophylaxis’ in any *** search was restricted to articles published in English within the last decade(1999-2009).Data sources included review articles published in core clinical journals,cohort studies,interventional studies,case control studies and cross sectional analyses. The mechanism of action,trial evidence of efficacy,side effects and geographical distribution of resistance is discussed for each prophylactic drug *** of prophylaxis in pregnancy and the cost considerations are discussed under two separate sub topics.

关键词： Malaria Prophylaxis Pregnancy Cost

Reinforcement of Thermoplastic Starch Films with Cellulose Fibres Obtained from Rice and Coffee Husks

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Journal of Renewable Materials 2018年第6期6卷 599-610页

作者： Sofía Collazo-Bigliardi rodrigo Ortega-Toro Amparo Chiralt Boix Instituto de Ingeniería de Alimentos para el Desarrollo Universitat Politècnica de ValènciaCamino de Vera s/n46022 ValenciaSpain Programa de Ingeniería de Alimentos Facultad de IngenieríaUniversidad de CartagenaCarrera 6#36-100Cartagena de Indias D.T y CColombia

Cellulosic fibres from coffee(CF)and rice(RF)husks have been obtained applying chemical treatments and characterized as to their microstructure and thermal *** materials have been incorporated into glycerol plasticised thermoplastic starch(TPS)films obtained by melt blending and compression moulding at 1 wt%,5 wt%and 10 wt%.Microstructure,thermal behaviour and optical,tensile and barrier properties of the composites were *** kinds of micro-fibres improve the film stiffness while reduced the film ***,CF better maintained the film ductility at 1 and 5 wt%.A network of fine oriented fibres was observed on the surface of the films,while internal fibres exhibited a good adherence to the polymer *** water vapour permeability of TPS films was not reduced in composites,although oxygen permeability was lowered by about 17%.Film transparency decreased by fibre addition in the UVVIS *** stability of composites was slightly higher than net TPS films.

关键词： Cellulose fibres coffee husk reinforcing properties rice husk starch composites

Identification of ISSR markers linked to flowering traits in a representative sample of Eucalyptus cladocalyx

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Journal of Forestry Research 2016年第2期27卷 239-245页

作者： rodrigo Contreras-Soto Paulina Ballesta Eduardo Ruiz Freddy Mora Department of Agronomy State University of Maring Department of Botany University of Concepción Institute of Biological Sciences University of Talca

Early flowering and flower abundance have long been considered desirable traits in eucalypt breeding programs. In particular, flowers of Eucalyptus cladocalyx provide a nectar source for the production of honey in arid ecosystems. To identify inter-simple sequence repeat （ISSR） markers that are associated with early flowering and flower abundance in the southern Atacama Desert, we used a sample of 47 trees, representing five Australian prove- nances of E. cladocalyx. A unified mixed linear model （which considered the effect of genetic structure and the kinship relationship among trees） revealed that three loci were significantly associated with early flowering, which accounted for 10-16 % of the phenotypic variation, while two loci accounted for 11-13 % in flowering intensity. Locus ISO1-500 bp was associated with both flowering traits. This result is consistent with our previous findings indicating that marker-assisted selection on early flowering should have significant and positive impact on flowering intensity. The application of marker-assisted selection to identify trees that flower early and intensively may increase honey production, a resource that generates additional income for the local farmers of the southern Atacama Desert.

关键词： Eucalyptus cladocalyx ISSR Floweringtraits Marker-assisted selection

Temporal dynamics of shallow subtidal meiobenthos from a beach in Tenerife (Canary Islands, northeast Atlantic Ocean)

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Acta Oceanologica Sinica 2013年第8期32卷 44-54页

作者： rodrigo Riera Jorge Núez María del Carmen Brito Centro de Investigaciones Medioambientales del Atlántico (CIMA SL) Arzobispo Elías Yanes 4438206 La Laguna Tenerife Canary Islands Spain Benthos Laboratory Department of Animal Biology Faculty of Biology University of La Laguna

A shallow subtidal （3 m deep） meiofaunal assemblage in Los Abrigos Bay, Tenerife, Canary Islands was sam- pled during May 2000-April 2001. The main aims were to （1） find temporal variations in meiofaunal assem- blage structure and overall abundance, as well as in the most abundant meiofaunal species throughout the study period, and （2） identify environmental variables （sedimentary composition, organic matter content, and total nitrogen） that better explain meiofaunal assemblage structure during the study year. The most abundant species were the nematodes Siphonolaimus sp. 2 and Catanema sp., which represented 46.2% of the overall meiofaunal abundances and varied significantly throughout the study duration. Overall meio- faunal abundance and the most abundant taxonomic groups （nematodes, copepods, and oligochaetes） showed significant temporal variations during the study period. Nematodes overwhelmingly dominated during the study period, ranging from 78% in May to 97.34% in February. Multivariate analyses showed seasonality in meiofaunal community structure during the study year, with the lowest abundances in May. Keywords： Meiofauna, assemblage structure, subtidal, Canary Islands, Atlantic Ocean

关键词： Meiofauna assemblage structure subtidal Canary Islands Atlantic Ocean

Modeling egg development of the pest Clavipalpus ursinus （Coleoptera： Melolonthidae） using a temperature-dependent approach

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Insect Science 2012年第6期19卷 657-665页

作者： Andrea Escobar rodrigo Gil Carlos Ricardo Bojaca Jaime Jimenez Facultad de Ciencias Naturales e Ingenieria Departamento de Ciencias Basicas Universidad de Bogota Jorge Tadeo Lozano Bogota Direccion Tecnica de Sanidad Vegetal Instituto Colombiano Agropecuario Bogota Colombia

Predicting the population dynamics of insects in natural conditions is es- sential for their management or preservation, and temperature-dependent development models contribute to achieving this. In this research the effects of temperature and soil moisture content on egg development and hatching of Clavipalpus ursinus （Blanchard） were evaluated. The eggs were exposed to seven temperature treatments with averages of 7.2, 13.0, 15.5, 19.7, 20.6, 22.0 and 25.3~C, in combination with three soil moisture contents of 40%, 60% and 80%. A linear and two non-linear （Lactin and Briere） models were evaluated in order to determine the thermal requirements of this developmental stage. Temperature affected significantly the time of development and egg hatching, while no significant effect was observed for moisture content. Thermal requirements were set as： 7.2℃ for lower developmental threshold, 20.6℃ for optimum developmental threshold, 25.3℃ for maximum temperature and 344.83 degree-days for the thermal constant. The linear model described satisfactorily egg development at intermediate temperatures; nev- ertheless, a slightly better fit of the observed data was obtained with the Lactin model. Egg development took place inside a narrow range of temperatures. Consequently, an increment of soil temperature could generate a negative impact on the population size of this species or changes in its biological parameters.

关键词： egg development pests soil moisture thermal requirements

Dendritic Growth, Eutectic Features and Their Effects on Hardness of a Ternary Sn–Zn–Cu Solder Alloy

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Acta Metallurgica Sinica(English Letters) 2017年第6期30卷 528-540页

作者： Bismarck Luiz Silva rodrigo Valenzuela Reyes Amauri Garcia JoséEduardo Spinelli Department of Materials Engineering Federal University of Rio Grande do Norte-UFRNNatalRN 59078-970Brazil Department of Materials Engineering Federal University of Sao Carlos-UFSCarSao CarlosSP 13565-905Brazil Department of Manufacturing and Materials Engineering University of CampinasUNICAMPCampinasSP 13083-860Brazil

The present investigation is based on the results of a directionally solidified （DS） Sn-9 wt%Zn-2 wt%Cu alloy, including primary/secondary/tertiary dendrite arm spacings of the Sn-rich matrix, the morphologies of the eutectic mixture and the corresponding interphase spacing, the nature and proportion of the Cu-Zn intermetallic compound （IMC）. The main purpose is to establish interrelations of these microstructure features with experimental solidification thermal parameters, such as cooling rates and growth rates （v）, macrosegregation and hardness. Such interrelations are interesting for both industry and academy since they represent a tool permitting the preprogramming of final properties based on the design of the microstructure. In the case of Sn-Zn-Cu alloys, hardly anything is known about the combined effects of the length scale of the microstructure and fraction and distribution of the primary IMC on hardness. The alloy microstructure is composed of a β-Sn dendritic region, surrounded by a eutectic mixture of α-Zn and β-Sn phases and the γ-Cu5Zn8 IMC. The eutectic interphase spacing varies in the range 1.2-3.6 μm, with the α-Zn phase having a globular morphology for ν 〉 0.5 mm/s and a needle-like morphology for ν 〈 0.3 mm/s. A modified Hall-Petch-type experimental expression relating hardness to the interphase spacing is proposed.

关键词： Sn-Zn-Cu solder alloy Solidification Microstructure Eutectic morphology Hardness

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

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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