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A Review of State-of-the-art Flexible Power Point Tracking Algorithms in Photovoltaic Systems for Grid Support:Classification and Application

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 1-21页

作者： Mina Haghighat Mehdi Niroomand Hossein dehghani Tafti Christopher d.Townsend Tyrone Fernando the department of Electrical Engineering University of IsfahanIsfahanIran the department of Electrical Electronic and Computer EngineeringUniversity of Western AustraliaCrawley WA 6009Australia

To maximize conversion efficiency,photovoltaic(PV)systems generally operate in the maximum power point tracking(MPPT)***,due to the increasing penetra tion level of PV systems,there is a need for more developed control functions in terms of frequency support services and voltage control to maintain the reliability and stability of the power ***,flexible active power control is a manda tory task for grid-connected PV systems to meet part of the grid ***,a significant number of flexible pow er point tracking(FPPT)algorithms have been introduced in the existing *** purpose of such algorithms is to real ize a cost-effective method to provide grid support functional ities while minimizing the reliance on energy storage *** paper provides a comprehensive overview of grid support functionalities that can be obtained with the FPPT control of PV systems such as frequency support and volt-var *** of these grid support functionalities necessitates PV sys tems to operate under one of the three control strategies,which can be provided with FPPT *** three control strate gies are classified as:①constant power generation control(CP GC),②power reserve control(PRC),and③power ramp rate control(PRRC).A detailed discussion on available FPPT algo rithms for each control strategy is also *** paper can serve as a comprehensive review of the state-of-the-art FPPT algorithms that can equip PV systems with various grid support functionalities.

关键词： Maximum power point tracking(MPPT) flexi ble power point tracking(FPPT) power reserve control(PRC) power ramp rate control(PRRC) low voltage ride-through(LVRT) constant power generation(CPG)

Natural parasites in conjunction with behavioral and color traits explain male agonistic behaviors in a lizard

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Current Zoology 2024年第1期70卷 59-69页

作者： Rodrigo Megia-Palma dhanashree Paranjpe Robert d.Cooper Pauline Blaimont Barry Sinervo department of Biomedicine and Biotechnology Parasitology UnitUniversidad de Alcala(UAH)E-28805Alcala de HenaresSpain CIBio Centro de Investigagao em Biodiversidade e Recursos GeneticosInBIO Laboratorio AssociadoCampus de VairaoUniversidade do PortoP-4485-661 VairaoPortugal BIOPOLIS Program in Genomics Biodiversity and Land PlanningCIBIOCampus de VairaoP-4485-661 VairaoPortugal Rupa Rahul Bajaj Center for Environment and art Empress Botanical GardensKavade MalaPuneIndia department of Ecology and Evolutionary Biology University of CaliforniaLos AngelesCA 90095USA department of Biology University of Houston Downtown1Main St.HoustonTX 77002USA department of Ecology and Evolutionary Biology University of CaliforniaSanta CruzCA 95064USA

Male competition conforms to a cost-benefit model,because while aggression may increase reproductive prospects,it can also increase the risk of *** hypothesize that an additional cost in aggressive males would be an increase in parasite load associated with a high energy investment into sexual *** of these infections,in turn,may downmodulate the level of host aggression via energetic *** staged dyadic male contests in the lab to investigate the relationships of multiple parasites with the agonistic behavior of lizard hosts,Sceloporus *** also included both color and behavioral traits from opponents in the analyses because(1)color patches of lizards may serve as intraspecific signals used by conspecifics to assess the quality of opponents,and(2)contests between male lizards fit classical models of escalated aggression,where lizards increase aggression displays in response to an opponent's *** results conform to our hypothesis because male lizards displayed more pushups when they had more ***,some parasites may modulate the levels of aggression because lizards infected by hematic coccidians performed fewer ***,lizards also displayed fewer pushups when both the chroma and size of the opponent's blue patch were *** results thus also supported the role of the blue patch of *** as a sexual armament,because it contributed to the deterrence of aggression from opponent *** revealed that natural parasitic infections in lizard hosts can contribute to their agonistic *** encourage future studies to account for parasites in behavioral testswithlizards.

关键词： Ixodes pacificus Lankesterella sexual selection social interactions ticks

Temperature and structure measurements of heavy-ion-heated diamond using in situ X-ray diagnostics

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Matter and Radiation at Extremes 2024年第4期9卷 80-89页

作者： J.Lutgert P.Hesselbach M.Schorner V.Bagnoud R.Belikov P.drechsel B.Heuser O.SHumphries P.Katrik B.Lindqvist C.Qu R.Redmer d.Riley G.Schaumann S.Schumacher A.Tauschwitz d.Varentsov K.Weyrich X.Yu B.Zielbauer Zs.Major P.Neumayer d.Kraus Institut fur Physik Universitat RostockAlbert-Einstein-Str.2318059 RostockGermany GSI Helmholtzzentrum fur Schwerionenforschung Planckstr.164291 DarmstadtGermany Institut für Angewandte Physik Goethe-Universität Frankfurt am MainMax-von-Laue-Str.160438 Frankfurt am MainGermany Institut fur Geowissenschaften Goethe-Universitat Frankfurt am MainAltenhoferallee 160438 Frankfurt am MainGermany Helmholtz-Zentrum dresden-Rossendorf Bautzner Landstr.40001328 DresdenGermany European XFEL GmbH Holzkoppel 422869 SchenefeldGermany Centre for Plasma Physics School of Mathematics and PhysicsQueen’s University BelfastUniversity RoadBelfast BT71NNUnited Kingdom Institut für Kernphysik Technische Universität DarmstadtSchlossgartenstr.964289 DarmstadtGermany State Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion PhysicsPeking UniversityBeijing 100871China Helmholtz Institut Jena Frobelstieg 307743 JenaGermany

We present in situ measurements of spectrally resolved X-ray scattering and X-ray diffraction from monocrystalline diamond samples heatedwith an intense pulse of heavy *** this way,we determine the samples’heating dynamics and their microscopic and macroscopic structuralintegrity over a timespan of several *** the ratio of elastic to inelastic scattering with state-of-the-art density functionaltheory molecular dynamics simulations allows the inference of average temperatures around 1300 K,in agreement with predictions fromstopping power *** simultaneous diffraction measurements show no hints of any volumetric graphitization of the material,butdo indicate the onset of fracture in the diamond *** experiments pave the way for future studies at the Facility for Antiproton andIon Research,where a substantially increased intensity of the heavy ion beam will be available.

关键词： heated intense structure

Visual field defects and retinal nerve fiber layer damage in buried optic disc drusen: a new insight

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International Journal of Ophthalmology(English edition) 2022年第10期15卷 1641-1649页

作者： Brenda Nana Wandji artémise dugauquier Adèle Ehongo Faculty of Medicine UniversitéLibre de BruxellesBrussels 1070Belgium department of Ophthalmology Erasme HospitalBrussels 1070Belgium

AIM: To assess the association between buried optic disc drusen(BOdd) location using spectral-domain optical coherence tomography(Sd-OCT) and the location of associated visual field defects(VFd) using the Garway-Heath ***: This monocentric retrospective crosssectional study was led at the authors’ institution. Adult patients diagnosed with BOdd who had complete records with a reliable Humphrey? 24-2 visual field, macular, and papillary OCT were enrolled. Fisher’s exact test was used to measure the association between BOdd location and VFd distribution according to Garway-Heath’s ***: Totally 20 eyes of 15 patients were included(60% females). The median age(interquartile range) was 63(43)y and the median best corrected visual acuity(BCVA) was-0.08(0.08) log MAR. BOdd were mostly located in zones A, E, and F. The minimal rim width(MRW) was globally preserved. The retinal nerve fiber layer(RNFL) was predominantly altered in zones d, E, and F. There was a significant correlation between BOdd location and that of RNFL alterations in zones d(P=0.03) and E(P=0.025);Moreover, the presence of BOdd in the E zone was significantly related to damaged RNFL in the neighbouring sectors d and F(P=0.012;P=0.02 respectively). Sixty-three percent(12/19) of visual fields were abnormal and there was a significant match(Phi=0.7, P=0.009) between drusen location and VFd only in zone ***: BOdd do not only affect young patients and can be more harmful than usually expected, as we found VFd in 63% of cases. There is a correspondence between BOdd location, RNFL damage, and VFd distributions. The presence of BOdd induces the overestimation of MRW,thereby disrupting its sensitivity as an early indicator of ganglion fibers damage.

关键词： buried optic disc drusen visual field spectral-domain optical coherence tomography Garway-Heath mapping retinal nerve fiber layer

最新综述执行摘要:终末期患者抗菌药物的使用

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中国感染控制杂志 2024年第8期23卷 1044-1046页

作者：刘婷谭彩霞(译) 吴安华(审校) Karlin d Pham C Furukawa d 中南大学湘雅医院医院感染控制中心湖南长沙410008 不详

对于仍然坚定致力于提供以患者为中心的医疗服务,并同时参与共同决策促进抗菌药物管理的感染性疾病(Id)医生来说,在患者终末期如何使用抗菌药物是一项挑战。在住院和门诊环境中为难治性或复发性感染患者提供连续治疗的感染性疾病医生可... 详细信息

对于仍然坚定致力于提供以患者为中心的医疗服务,并同时参与共同决策促进抗菌药物管理的感染性疾病(Id)医生来说,在患者终末期如何使用抗菌药物是一项挑战。在住院和门诊环境中为难治性或复发性感染患者提供连续治疗的感染性疾病医生可以在患者生命特别脆弱的时刻提供周到的、精准的指导。

关键词：姑息治疗抗菌药物抗菌药物管理临终关怀

Sums of Primes and Quadratic Linear Recurrence Sequences

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Acta Mathematica Sinica,English Series 2013年第12期29卷 2251-2260页

作者： artūras dUBICKAS department of Mathematics and Informatics Vilnius University

Let u be a sequence of positive integers which grows essentially as a geometric progression. We give a criterion on u in terms of its distribution modulo d, d = 1, 2,..., under which the set of positive integers expressible by the sum of a prime number and an element of u has a positive lower density. This criterion is then checked for some second order linear recurrence sequences. It follows, for instance, that the set of positive integers of the form p ＋ [（2 ＋ √3）n], where p is a prime number and n is a positive integer, has a positive lower density. This generalizes a recent result of Enoch Lee. In passing, we show that the periods of linear recurrence sequences of order m modulo a prime number p cannot be ＂too small＂ for most prime numbers p.

关键词： Romanoff's theorem prime number linear recurrence distribution modulo m asymptotic density

Evolution of wheat architecture,physiology,and metabolism during domestication and further cultivation:Lessons for crop improvement

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The Crop Journal 2023年第4期11卷 1080-1096页

作者： arturs Katamadze Omar Vergara-díaz Estefanía Uberegui Ander Yoldi-Achalandabaso José Luis Araus Rubén Vicente Plant Ecophysiology and Metabolism Group Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaP-2780 OeirasPortugal Genetics and Genomics of Plant Complex Traits Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaP-2780 OeirasPortugal FisioClimaCO_(2) Group Department of Plant Biology and EcologyFaculty of Science and TechnologyUniversity of the Basque CountryE-48940 LeioaSpain Integrative Crop Ecophysiology Group Section of Plant PhysiologyFaculty of BiologyUniversity of BarcelonaE-08028 Barcelona&AGROTECNIO-CERCA CenterE-25198 LleidaSpain

In recent decades,genetic advances in yield improvement in the major cereal crops,including wheat,has stagnated or proceeded at a slower rate than is required to meet future global food demand,particularly in the face of climate *** reverse this situation,and in view of the future climate scenario,there is a need to increase the genetic diversity of wheat to increase its productivity,quality,stability,and adaptation to local *** abundant genetic resources and literature are a basis for wheat ***,many species,such as wild relatives,landraces,and old cultivars have not been studied beyond their agronomic characteristics,highlighting the lack of understanding of the physiological and metabolic processes(and their integration) associated with higher productivity and resilience in limiting *** studies using wheat ancestors and modern cultivars may identify novel traits that have not previously been considered,or have been underestimated,during domestication and breeding,but that may contribute to future food *** review describes existing wheat genetic diversity and changes that occurred during domestication and breeding,and considers whether mining natural variation among wheat ancestors offers an opportunity to enhance wheat agronomic performance,spike architecture,canopy-and organ-level photosynthetic capacity,and responses to abiotic stress,as well as to develop new wheat hybrids.

关键词： Breeding Landraces Photosynthesis Wild relatives Yield

RETINAL SPECTRAL IMAGING ANd BLOOd FLOW MEASUREMENT

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Journal of Innovative Optical Health Sciences 2010年第4期3卷 255-265页

作者： PAUL LEMAILLET dONALd d.dUNCAN art LOMPAdO MOHAMEd IBRAHIM QUAN dONG NGUYEN JESSICA C.RAMELLA-ROMAN department of Biomedical Engineering The Catholic University of America 620 Michigan Ave. N.E.WashingtonDC 20064USA ECE department Portland State University 1900 SW Fourth AvenuePortlandOR 97201USA Polaris Sensor Technologies 200 Westside Square Suite 320 HuntsvilleAL 35801USA Wilmer Eye Institute Johns Hopkins University BaltimoreMD 21287USA

Measurement of both oxygen saturation and blood flow in the retinal vessels has proved to give important information about the eye health and the onset of eye pathologies such as diabetic *** this study,we present the implementation,on a commercially available fundus camera,of a retinal imager and a retina blood flow *** retinal imager uses division of aperture to acquire nine wavelength-dependent sub-images of the *** consideration is taken to improve image transfer by measuring the optical properties of the fundus camera and modeling the optical train in *** part of the setup is calibrated with optical phantoms of known optical properties that are also used to build a lookup table(LUT)linking phantom optical properties to measured *** retina blood flow velocimeter relies on tracking clusters of erythrocytes and uses a fast acquisition camera attached to a zoom lens,with a green illumination *** is provided using a calibrated quartz capillary tube and human blood at a known flow *** properties of liquid phantoms are retrieved from measured reflectance using the LUT,and blood flow measurements in the retina are presented.

关键词： Retinal oximetry fundus ophthalmoscope multi-aperture camera blood flow velocity diabetic retinopathy

A Review on Technologies for the Use of CO2 as a Working Fluid in Refrigeration and Power Cycles

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Energy and Power Engineering 2024年第6期16卷 217-256页

作者： Orelien T. Boupda Hyacinthe d. Tessemo Isidore B. Nkounda Fongang Francklin G. Nyami Frederic Lontsi Thomas djiako Laboratory of Energy Higher National Polytechnic School of Douala University of Douala Douala Cameroon Institut Ucac-Icam Douala Cameroon department of Energy and Mechanical Engineering ISTA-IUG University of Ngaoundere Ngaoundere Cameroon

The use of carbon dioxide as a working fluid has been the subject of extensive studies in recent years, particularly in the field of refrigeration where it is at the heart of research to replace CFC and HCFC. Its thermodynamic properties make it a fluid of choice in the efficient use of energy at low and medium temperatures in engine cycles. However, the performance of transcritical CO2 cycles weakens under high temperature and pressure conditions, especially in refrigeration systems;On the other hand, this disadvantage becomes rather interesting in engine cycles where CO2 can be used as an alternative to the organic working fluid in small and medium-sized electrical systems for low quality or waste heat sources. In order to improve the performance of systems operating with CO2 in the field of refrigeration and electricity production, research has made it possible to develop several concepts, of which this article deals with a review of the state of the art, followed by analyzes in-depth and critical of the various developments to the most recent modifications in these fields. detailed discussions on the performance and technical characteristics of the different evolutions are also highlighted as well as the factors affecting the overall performance of the systems studied. Finally, perspectives on the future development of the use of CO2 in these different cycles are presented.

关键词： Refrigeration Cycle Power Cycle System Performance Transcritical CO2 Cycles Working Fluid