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Improving precision of field inventory estimation of aboveground biomass through an alternative view on plot biomass

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Forest Ecosystems 2020年第4期7卷 760-769页

作者： Christoph Kleinn Steen Magnussen Nils Nölke paul magdon.juan.gabrielálvarez-gon.ález Lutz Fehrmann César Pérez-Cruzado Forest Inventory and Remote Sensing Georg-August-Universität Göttingen37077 GöttingenGermany. Canadian Forest Service Natural Resources CanadaVictoriaBC V8Z 1M5Canada. Department of Agroforestry Engineering University of Santiago de CompostelaE-27002 LugoSpain

We contrast a new continuous approach(CA)for estimating plot-level above-ground biomass(AGB)in forest inventories with the current approach of estimating AGB exclusively from the tree-level AGB predicted for each tree in a plot,henceforth called DA(discrete approach).With the CA,the AGB in a forest is modelled as a continuous surface and the AGB estimate for a fixed-area plot is computed as the integral of the AGB surface taken over the plot *** with the CA,the portion of the biomass of in-plot trees that extends across the plot perimeter is ignored while the biomass from trees outside of the plot reaching inside the plot is *** use a sampling simulation with data from a fully mapped two hectare area to illustrate that important differences in plot-level AGB estimates can *** CA-based estimates of mean AGB should be less variable than those derived from the *** realized,this difference translates to a higher precision from field sampling,or a lower required sample *** our case study with a target precision of 5%(*** standard error of the estimated mean AGB),the CA required a 27.1%lower sample size for small plots of 100 m2 and a 10.4%lower sample size for larger plots of 1700 *** examined sampling induced errors only and did not yet consider model *** discuss practical issues in implementing the CA in field inventories and the potential in applications that model biomass with remote sensing *** CA is a variation on a plot design for above-ground forest biomass;as such it can be applied in combination with any forest inventory sampling design.

关键词： Branch biomass Foliage biomass Stem biomass Biomass surface plots Sampling surfaces Standard error of estimation

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Impulsive perturbation and bifurcation of solutions for a model of chemostat with variable yield

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Applied Mathematics and Mechanics(English Edition) 2009年第7期30卷 933-944页

作者：张弘 paul Georgescu juan J.Nieto 陈兰荪 Department of Mathematics Jiangsu University Department of Mathematics and Mathematical Statistics Ume University Department of Mathematics "Gh.Asachi" Technical University of Iasi Departamento de Análisis Matemático Facultad de Matemáticas Universidadde Santiago de Compostela Institute of Mathematics Chinese Academy of Sciences

In this paper, we consider a variable yield model of a single-species growth in a well-stirred tank containing fresh medium, assuming the instances of time as triggering factors in which the nutrient refilling process and the removal of microorganisms by the uptake of lethal external antibiotic are initiated. It is also assumed that the periodic nutrient refilling and the periodic antibiotic injection occur with the same periodicity, but not simultaneously. The model is then formulated in terms of autonomous differential equations subject to impulsive perturbations. It is observed that either the population of microorganisms essentially washes out, or more favorably, the system is permanent. To describe this dichotomy, some biologically significant integral conditions are introduced. Further, it is shown that in a certain critical situation, a nontriviai periodic solution emerges via a bifurcation phenomenon. Finally, the dynamics of the model is illustrated with numerical experiments and computer simulations.

关键词： chemostat impulsive differential equation permanence extinction fixedpoint approach bifurcation

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Geographic-Scale Coffee Cherry Counting with Smartphones and Deep Learning

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Plant Phenomics 2024年第2期6卷 390-400页

作者： juan Camilo Rivera-Palacio Christian Bunn Eric Rahn Daisy Little-Savage paul Günter Schmidt Masahiro Ryo Leibniz Centre for Agricultural Landscape Research(ZALF) Müncheberg15374Germany Alliance of Bioversity International and CIAT Rome00153Italy Brandenburg University of Technology Cottbus-Senftenberg Cottbus03046Germany Producers Direct LondonE28EXUK

Deep learning and computer vision,using remote sensing and drones,are 2 promising nondestructive methods for plant monitoring and ***,their applications are infeasible for many crop systems under tree canopies,such as coffee crops,making it challenging to perform plant monitoring and phenotyping at a large spatial scale at a low *** study aims to develop a geographic-scale monitoring method for coffee cherry counting,supported by an artificial intelligence(AI)-powered citizen science *** approach uses basic smartphones to take a few pictures of coffee trees;2,968 trees were investigated with 8,904 pictures in Junin and Piura(Peru),Cauca,and Quindio(Colombia)in 2022,with the help of nearly 1,000 smallholder coffee ***,we trained and validated YOLO(You Only Look Once)v8 for detecting cherries in the dataset in *** average number of cherries per picture was multiplied by the number of branches to estimate the total number of cherries per *** model's performance in Peru showed an R^(2)of *** the model was tested in Colombia,where different varieties are grown in different biogeoclimatic conditions,the model showed an R^(2)of *** overall performance in both countries reached an R^(2)of *** results suggest that the method can be applied to much broader scales and is transferable to other varieties,countries,and *** our knowledge,this is the first AI-powered method for counting coffee cherries and has the potential for a geographic-scale,multiyear,photo-based phenotypic monitoring for coffee crops in low-income countries worldwide.

关键词： geographic learning scale coffee deep with cherry counting smartphones

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Clinical outcomes of patterned laser trabeculoplasty as adjuvant therapy in open angle glaucoma and ocular hypertension

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International Journal of Ophthalmology(English edition) 2018年第4期11卷 635-640页

作者： Gustavo Espinoza Leonardo Castellanos Ignacio Rodriguez-Una paul Anthony Camacho juan Camilo Parra Fundacion Oftalmologica de Santander FOSCAL FloridablancaSantanderColombia Instituto Oftalmologico Fernandez-Vega University of OviedoOviedoAsturias 33012Spain Facultad de Salud Universidad Autonoma de BucaramangaBucaramangaSantanderColombia

AIM： To assess the efficacy and safety of patterned laser trabeculoplasty（PLT） as an adjunctive treatment in open angle glaucoma（OAG） or ocular hypertension（OHT） patients who were under antiglaucoma medical ***： This study was a retrospective review of primary or secondary OAG patients and OHT patients with medically uncontrolled（≥18 mm Hg） intraocular pressure（IOP） who underwent 360o PLT from June 2016 to August 2016. Follow-up visits at week 1, and 1, 3 and 6 mo were performed. IOP, best corrected visual acuity（BCVA）, complications and eye drop glaucoma medication were recorded at each follow-up visit. Success was defined as IOP reduction ≥20% from baseline. RESULTS： Forty-one eyes of 25 patients were included in this study. Pre-treatment mean IOP was 20.2±1.6 mm Hg. After PLT, IOP was 19.3±5.2, 16.1±2.7, 17.1±3.7 and 16.3±3.5 mm Hg,at 1 wk, 1, 3 and 6 mo, respectively. IOP reduction from baseline was statistically significant from the first month, remaining stable at 6 mo（P〈0.001）. PLT success at 6 mo of follow-up was 48.78%. The number of glaucoma medication per eye（P=0.10） and the mean BCVA both remained constant（P=0.37）. Complications included transient IOP spikes in 4 eyes（9.8%） and peripheral anterior synechiae in 7 eyes（17.1%）. CONCLUSION： PLT is an effective and safe method for the management of patients with OHT or OAG as an adjunctive therapy. Additional larger studies should be designed to verify the long-term stability of IOP reduction with this laser technology.

关键词： glaucoma intraocular pressure laser ocular hypertension trabeculoplasty

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Ballistic impact response of flexible and rigid UHMWPE textile composites:Experiments and simulations

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Defence Technology（防务技术） 2023年第4期22卷 37-53页

作者： Hongxu Wang Dakshitha Weerasinghe paul J.Hazell Damith Mohotti Evgeny V.Morozov juan P.Escobedo-Diaz School of Engineering and Information Technology The University of New South WalesCanberraACT2600Australia

This study elaborates on the effects of matrix rigidity on the high-velocity impact behaviour of UHMWPE textile composites using experimental and numerical *** composite samples were manufactured of a plain-weave fabric(comprising Spectra?1000 fibres)and four different matrix ***-velocity impact tests were conducted by launching a spherical steel projectile to strike on the prepared samples via a gas *** experimental results showed that the textile composites gradually changed from a membrane stretching mode to a plate bending mode as the matrix rigidity and thickness *** composites deformed in the membrane stretching mode had higher impact resistance and energy absorption capacity,and it was found that the average energy absorption per ply was much higher in this mode,although the number of broken yarns was smaller in the perforated ***,the flexible matrix composites always had higher perforation resistance but larger deformation than the rigid matrix counterparts in the tested thickness and velocity range.A novel numerical modelling approach with enhanced computational efficiency was proposed to simulate textile composites in mesoscale *** simulation results revealed that stress and strain development in the more rigid matrix composite was localised in the vicinity of the impact location,leading to larger local deformation and inferior perforation resistance.

关键词： Impact behaviour Textile composite UHMWPE fibre Energy absorption Finite element analysis

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Amphibians and Reptiles of Luzon Island, Philippines: the Herpetofauna of Pantabangan-Carranglan Watershed, Nueva Ecija Province, Caraballo Mountain Range

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Asian Herpetological Research 2018年第4期9卷 201-223页

作者： paul Henric P. GOJO CRUZ Leticia E.AFUANG juan Carlos T. gon.Alez William SM.GRUEZO Faculty Department of Biological Sciences College of Arts and Sciences Central Luzon State University Faculty Animal Biology Division Institute of Biological Sciences College of Arts and Sciences University of the Philippines Los Ba?os Adjunct Faculty Graduate School University of the Philippines Los Ba?os

We present detailed species accounts for fifty-nine(59) species of amphibians and reptiles(17 frogs, 14 skinks, 3 agamids, 6 gekkonid lizards, 2 varanids, and 17 snakes) from Pantabangan-Carranglan Watershed, which lies within the Caraballo Mountain Range, whose biota is poorly-known. This was also the first extensive survey of herpetofauna within the watershed. Together with data from previous literature reviews, our records bring the total number of species of amphibians and reptiles for the Caraballo Mountain Range to 66. Forty-two(42) species from the area were Philippine endemics, with 25 species recorded only from Luzon faunal region. Seven species of herpetofauna are associated with unresolved taxonomic issues(new species and species complexes needing taxonomic partitioning, e.g. splitting of species groups). Two species recorded from the area were rarely represented in museum collections. Major distributional and elevational range extensions were recorded for several species. Comparison with Luzon’s other mountain ranges showed that the Caraballo Mountain Range is similar, in terms of species composition, to the northern Sierra Madre and Cordillera Mountain Ranges. The result of this survey showed the Caraballo Mountain Range and its mountains as a possible new center of herpetofaunal diversity and endemicity within Luzon. The importance of the Caraballo Mountain Range as an important biogeographic link merits further study.

关键词： Caraballo mountain range diversity ecology habitat herpetofauna

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Compound screening platform using human induced pluripotent stem cells to identify small molecules that promote chondrogenesis

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Protein & Cell 2012年第12期3卷 934-942页

作者： Sheng-Lian Yang Erica Harnish Thomas Leeuw Uwe Dietz Erika Batchelder paul SWright Jane Peppard paul August Cecile Volle-Challier Francoise Bono Jean-Marc Herbert juan Carlos Izpisua Belmonte Gene Expression Laboratories The Salk Institute for Biological Studies10010 N.Torrey Pines Rd.La JollaCA 92037USA Sanofi US R&DEarly to Candidate UnitTucson Research Center2090 E.Innovation Park DriveTucsonAZ 85755USA Sanofi Deutschland GmbH R&DTSU Aging Quality of LifeIndustriepark HoechstFrankfurt am Main 65926Germany Sanofi R&D Early to Candidate Unit195Route d'Espagne-BP 13669ToulouseFrance Center of Regeneration Medicine Dr.Aiguader 88Barcelona 08003Spain

Articular cartilage,which is mainly composed of collagen Ⅱ,enables smooth skeletal *** of collagen Ⅱ can be caused by various events,such as injury,but degeneration especially increases over the course of normal ***,the body does not fully repair itself from this type of degeneration,resulting in impaired ***,an articular cartilage repair surgical technique,has been commonly used in the clinic to induce the repair of tissue at damage *** stem cells(MSC)have also been used as cell therapy to repair degenerated ***,the therapeutic outcomes of all these techniques vary in different patients depending on their age,health,lesion size and the extent of damage to the *** repairing tissues either form fibrocartilage or go into a hypertrophic stage,both of which do not reproduce the equivalent functionality of endogenous hyaline *** of the reasons for this is inefficient chondrogenesis by endogenous and exogenous *** that promote chondrogenesis could be used to induce self-repair of damaged cartilage as a non-invasive approach alone,or combined with other techniques to greatly assist the therapeutic *** recent development of human induced pluripotent stem cell(iPSCs),which are able to self-renew and differentiate into multiple cell types,provides a potentially valuable cell resource for drug screening in a“more relevant”cell *** we report a screening platform using human iPSCs in a multi-well plate format to identify compounds that could promote chondrogenesis.

关键词： hESC hiPSC chondrogenesis compound screening platform

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Quantitative Electrophilicity Measures

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物理化学学报 2018年第6期34卷 662-674页

作者： gon.ález Marco Martínez CáRDENAS Carlos RODRíGUEZ juan I. LIU Shubin HEIDAR-ZADEH Farnaz MIRANDA-QUINTANA Ramón Alain AYERS paul W. Laboratory of Computational and Theoretical Chemistry Faculty of Chemistry University of Havana Havana 10400 Cuba. Departamento de Quimica and Centro de Quimica Universidade de Coimbra 3004-535 Coimbra Portugal. Departamento de Fisica Fac

Quantitative correlation of several theoretical electrophilicity measures over different families of organic compounds are examined relative to the experimental values of Mayr et ***,the ability to predict these values accurately will help to elucidate the reactivity and selectivity trends observed in charge-transfer reactions.A crucial advantage of this theoretical approach is that itprovides this information without the need of experiments,which are often demanding and ***,two different types of electrophilicity measures were ***,models derived from conceptual density functional theory(c-DFT),including Parr's original proposal and further generalizations of this index,are *** instance,the approaches of Gázquez et *** Chamorro et *** considered,whereby it is possible to distinguish between processes in which a molecule gains or loses ***,we also explored two novel electrophilicity *** one hand,the potential of environmental perturbations to affect electron incorporation into a system is analyzed in terms of recent developments in *** studies highlight the importance of considering the molecular surroundings when a consistent description of chemical reactivity is *** the other hand,we test a new definition of electrophilicity that is free from inconsistencies(so-called thermodynamic electrophilicity).This approach is based on Parr's pioneering insights,though it corrects issues present in the standard working expression for the calculation of ***,we use machine-learning tools(i.e.,symbolic regression) to identify the models that best fit the experimental *** this way,the best possible description of the electrophilicity values in terms of different electronic structure quantities is ***,this straightforward approach enables one to obtain good correlations between the theoretical and experimental quantities by using the simple,yet p

关键词： Electrophilicity Conceptual density functional theory Symbolic regression Genetic programming Grammatical evolution

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Extreme multiexciton emission from deterministically assembled single-emitter subwavelength plasmonic patch antennas

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Light(Science & Applications) 2020年第1期9卷 1697-1705页

作者： Amit Raj Dhawan Cherif Belacel juan Uriel Esparza-Villa Michel Nasilowski Zhiming Wang Catherine Schwob Jean-paul Hugon.n Laurent Coolen Benoit Dubertret Pascale Senellart Agnes Maitre Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054People’s Republic of China Sorbonne Universite CNRSInstitut des Nanosciences de ParisUMR 758875005 ParisFrance Centre de Nanosciences et de Nanotechnologies et de Nanostructures CNRS UMR9001Universite Paris-Saclay10 boulevard Thomas Gobert91120 MarcoussisFrance Laboratoire de Physique et d’Etude des Materiaux ESPCI-ParisTechPSL Research UniversitySorbonne UniversiteCNRS UMR 821310 rue VauquelinParis 75005France Laboratoire Charles Fabry Institut d’Optique Graduate SchoolCNRS UMR 8501Universite Paris Saclay2 avenue Augustin Fresnel91127 Palaiseau CedexFrance

Coupling nano-emitters to plasmonic antennas is a key milestone for the development of nanoscale quantum light *** challenge,however,is the precise nanoscale positioning of the emitter in the ***,we present a laser etching protocol that deterministically positions a single colloidal CdSe/CdS core/shell quantum dot emitter inside a subwavelength plasmonic patch antenna with three-dimensional nanoscale *** exploiting the properties of metal–insulator–metal structures at the nanoscale,the fabricated single-emitter antenna exhibits a very high-Purcell factor(>72)and a brightness enhancement of a factor of *** to the unprecedented quenching of Auger processes and the strong acceleration of the multiexciton emission,more than 4 photons per pulse can be emitted by a single quantum dot,thus increasing the device *** technology can be applied to a wide range of photonic nanostructures and emitters,paving the way for scalable and reliable fabrication of ultracompact light sources.

关键词： patch precise acceleration

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Einstein Probe discovery of EP240408a: A peculiar X-ray transient with an intermediate timescale

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 222-240页

作者： Wenda Zhang Weimin Yuan Zhixing Ling Yong Chen Nanda Rea Arne Rau Zhiming Cai Huaqing Cheng Francesco Coti Zelati Lixin Dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue Li paul O’Brien Rongfeng Shen Xinwen Shu Shengli Sun Xiaojin Sun Xiaofeng Wang Lei Yang Bing Zhang Chen Zhang Shuang-Nan Zhang Yonghe Zhang Jie An David Buckley Alexis Coleiro Bertrand Cordier Liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P.U.Fynbo Lluis Galbany Saurabh W.Jha Shuaiqing Jiang Albert Kong Erik Kuulkers Weihua Lei Wenxiong Li Bifang Liu Mingjun Liu Xing Liu Yuan Liu Zhu Liu Chandreyee Maitra Alessio Marino Itumeleng Monageng Kirpal Nandra Jeremy Sanders Roberto Soria Lian Tao Junfeng Wang Song Wang Tinggui Wang Zhongxiang Wang Qingwen Wu Xuefeng Wu Dong Xu Yanjun Xu Suijian Xue Yongquan Xue Zijian Zhang Zipei Zhu Hu Zou Congying Bao Fansheng Chen Houlei Chen Tianxiang Chen Wei Chen Yehai Chen Yifan Chen Chenzhou Cui Weiwei Cui Yanfeng Dai Dongwei Fan Ju Guan Dawei Han Dongjie Hou Haibo Hu Maohai Huang Jia Huo Zhenqing Jia Bowen Jiang Ge Jin Chengkui Li Junfei Li Longhui Li Maoshun Li Wei Li Zhengda Li Tianying Lian Congzhan Liu Heyang Liu Huaqiu Liu Fangjun Lu Laidan Luo Jia Ma Xuan Mao Haiwu Pan Xin Pan Liming Song Hui Sun Yunyin Tan Qingjun Tang Yihan Tao Hao Wang juan Wang Lei Wang Wenxin Wang Yilong Wang Yusa Wang Qinyu Wu Haitao Xu Jingjing Xu Xinpeng Xu Yunfei Xu Zhao Xu Changbin Xue Yulong Xue Ailiang Yan Haonan Yang Xiongtao Yang Yanji Yang juan Zhang Mo Zhang Wenjie Zhang Zhen Zhang Zhen Zhang Ziliang Zhang Donghua Zhao Haisheng Zhao Xiaofan Zhao Zijian Zhao Hongyan Zhou Yilin Zhou Yuxuan Zhu Zhencai Zhu National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Sciences University of Chinese Academy of Sciences Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Institute of Space Sciences (ICE) CSIC Institut d’Estudis Espacials de Catalunya (IEEC) Max Planck Institute for Extraterrestrial Physics Innovation Academy for Microsatellites Chinese Academy of Sciences Department of Physics University of Hong Kong School of Physics and Astronomy University of Leicester School of Physics and Astronomy Sun Yat-sen University Department of Physics Anhui Normal University Shanghai Institute of Technical Physics Chinese Academy of Sciences Physics Department Tsinghua University Nevada Center for Astrophysics University of Nevada Las Vegas Department of Physics and Astronomy University of Nevada Las Vegas South African Astronomical Observatory Department of Astronomy University of Cape Town Department of Physics University of the Free State Université Paris Cité CNRS Astroparticule et Cosmologie Université Paris Cité CEA Paris-Saclay IRFU/DAp-AIM Department of Astronomy Guangzhou University Cosmic Dawn Center (DAWN) Niels Bohr Institute University of Copenhagen Department of Physics and Astronomy Rutgers the State University of New Jersey Institute for Cosmic Ray Research The University of Tokyo ESA/ESTEC Department of Astronomy School of Physics Huazhong University of Science and Technology INAF-Osservatorio Astrofisico di Torino Sydney Institute for Astronomy School of Physics The University of Sydney Department of Astronomy Xiamen University Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University Department of Astronomy University of Science and Technology School of Astronomy and Space Sciences University of Science and Technology of China Institute of Deep Space Sciences Deep Space Exploration Laboratory Department of Astronomy School of Physics and Astronomy Yunnan University Shanghai Astronomical Observatory Chi

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe （EP） and follow-up studies made with EP,Swift,NICER,GROND,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope （WXT） on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for *** flare reached a peak flux of 3.9×10-9erg cm-2s-1in 0.5-4 ke V,～300 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and NICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 ke V,with a power-law photon index varying *** X-ray light curve shows a plateau lasting for ～4 d,followed by a steep decay till becoming undetectable ～10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23 d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of～10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

关键词： X-ray transients ${\bm~{Einstein~~Probe}}$

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