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Journal articles on the topic 'Tree centre of gravity'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Štofko, Peter. "Aboveground parameters of spruce (Picea abies (L.) Karst.) stability in the light of discriminant analysis." Folia Forestalia Polonica, Series A - Forestry 54(3) (March 1, 2012): 153–58. https://doi.org/10.5281/zenodo.30868.

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In the locality Zemská (the Low Tatras Mts.) the following aboveground parameters were measured in windthrown and undamaged Norway spruce Picea abies (L.) Karst. trees: stem diameter at breast height, stem diameter measured 20cm from ground level, tree height, crown length, and crown width. The stem quotients, crown proportion index, height position of the green crown, and the height of the tree centre of gravity were calculated from these data. Our results agreed with the present understanding that a wide tree crown has a negative effect on spruce stability. Paradoxically, from the vie

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Lynth, Thomas B., Timothy A. Max, Harold E. Burkhart, and Jiping Liu. "Prediction Equations for Centers of Gravity and Moments of Inertia of Loblolly Pine Stems." Forest Science 39, no. 2 (1993): 260–74. http://dx.doi.org/10.1093/forestscience/39.2.260.

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Abstract Adequate design of tree harvesting equipment requires reliable estimates of centers of gravity and moments of inertia for full trees and tree-length stems. Several prediction models were developed for both centers of gravity and moments of inertia based on the theory of geometric solids. These models were fitted to center of gravity and moment of inertia estimates that were derived from stem dimension and weight measurements on loblolly pine (Pinus taeda L.) trees. The models were compared, and the best prediction equations for center of gravity and moment of inertia of tree-length st

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3

Khmelnitskaya, Anna, Özer Selçuk, and Dolf Talman. "The average covering tree value for directed graph games." Journal of Combinatorial Optimization 39, no. 2 (2019): 315–33. http://dx.doi.org/10.1007/s10878-019-00471-5.

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Abstract We introduce a single-valued solution concept, the so-called average covering tree value, for the class of transferable utility games with limited communication structure represented by a directed graph. The solution is the average of the marginal contribution vectors corresponding to all covering trees of the directed graph. The covering trees of a directed graph are those (rooted) trees on the set of players that preserve the dominance relations between the players prescribed by the directed graph. The average covering tree value is component efficient, and under a particular convex

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4

Fredericksen, T. S., R. L. Hedden, and S. A. Williams. "Testing loblolly pine wind firmness with simulated wind stress." Canadian Journal of Forest Research 23, no. 9 (1993): 1760–65. http://dx.doi.org/10.1139/x93-222.

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The forces and mechanics related to the wind firmness of 30-year-old loblolly pine (Pinustaeda L.) trees were tested by toppling them with a winch and cable system. The ability of trees to resist toppling, expressed as the critical turning moment, was determined by measuring the force exerted by the winch and the height on the tree where the center of force was exerted. Critical turning moments were closely and positively related to stem taper (R2 = 0.91) and various measures of tree size, including tree weight (R2 = 0.96), stem volume (R2 = 0.94), and cubic diameter at breast height (R2 = 0.9

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Chiba, Rimpei, and Ralph Schönrich. "Tree-ring structure of Galactic bar resonance." Monthly Notices of the Royal Astronomical Society 505, no. 2 (2021): 2412–26. http://dx.doi.org/10.1093/mnras/stab1094.

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ABSTRACT Galaxy models have long predicted that galactic bars slow down by losing angular momentum to their postulated dark haloes. When the bar slows down, resonance sweeps radially outwards through the galactic disc while growing in volume, thereby sequentially capturing new stars at its surface/separatrix. Since trapped stars conserve their action of libration, which measures the relative distance to the resonance centre, the order of capturing is preserved: the surface of the resonance is dominated by stars captured recently at large radius, while the core of the resonance is occupied by s

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Prayitno, Tibertius Agus, Yustinus Suranto, Rieska Wahyu Indra Pratama, and Dasta Dasta. "The Effect of Site Class, Tree-age and Axial Direction on Adhesion Properties of Teakwood." Wood Research Journal 4, no. 2 (2017): 62–67. http://dx.doi.org/10.51850/wrj.2013.4.2.62-67.

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Teak wood is a well-known prime wood species in Indonesia. The teak forest had been managed well by PERHUTANI, a state forest company for a long time. In the teak forest the site quality has been classified according to land’s capability to grow the teak plant. This site classification had been set up from the beginning of forest management and it has not been reviewed yet. This research’s objectives are to know the effect of teak forest site quality class and axial direction on the adhesion properties of the teak wood. The research conducted using Completely Randomized Design arranged in fact

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7

Tarsha Kurdi, Fayez, Elżbieta Lewandowicz, Zahra Gharineiat, and Jie Shan. "Accurate Calculation of Upper Biomass Volume of Single Trees Using Matrixial Representation of LiDAR Data." Remote Sensing 16, no. 12 (2024): 2220. http://dx.doi.org/10.3390/rs16122220.

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This paper introduces a novel method for accurately calculating the upper biomass of single trees using Light Detection and Ranging (LiDAR) point cloud data. The proposed algorithm involves classifying the tree point cloud into two distinct ones: the trunk point cloud and the crown point cloud. Each part is then processed using specific techniques to create a 3D model and determine its volume. The trunk point cloud is segmented based on individual stems, each of which is further divided into slices that are modeled as cylinders. On the other hand, the crown point cloud is analyzed by calculati

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Chen, Yexin, Jianxi Zhu, Liwen Yao, et al. "Analysis and Optimization of Driving Performance for Tree Transplanting Machine in Hilly Mountainous Areas." Forests 15, no. 12 (2024): 2128. https://doi.org/10.3390/f15122128.

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A structural optimization scheme for the prototype is proposed to improve the driving performance of tree transplanting machines operating in hilly and mountainous environments. Through theoretical analysis of the tree transplanting machine’s stability and passability, we determined the relationship between the center of gravity offset distance and overall performance when climbing slopes and crossing steps and trenches. This analysis determined the optimal parameter for the center of gravity offset distance. Subsequently, the prototype structure was optimized, and the center of gravity positi

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9

Greenwood, Philip, Jan Bauer, and Nikolaus J. Kuhn. "Assessing hillslope sediment generation potential by tree throw: a preliminary field study along a small river valley in the Jura Mountains, northwest Switzerland." Geographica Helvetica 76, no. 3 (2021): 319–33. http://dx.doi.org/10.5194/gh-76-319-2021.

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Abstract. A preliminary field-based investigation was undertaken in a small (< 10 km2) river valley located in the mountainous Jura region of northwest Switzerland. The aims of the work were to assess sediment generation and annual sediment transport rates by tree throw on forested hillslopes and to document surface hydrology characteristics on four fresh tree throw mounds associated with recent tree throws over a 24 d monitoring period. For the tree throw mounds, average sediment recovery ranged from 7.7–28.2 g (dry weight), equivalent to a suspended sediment concentration of 145.2–327.8 g

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Dahle, Gregory, and Jason Grabosky. "Determining if Lateral Imbalance Exists in First-order Branches Leading to a Potential Development of Torsional Stress." Arboriculture & Urban Forestry 38, no. 4 (2012): 141–45. http://dx.doi.org/10.48044/jauf.2012.021.

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The management of urban trees requires an ability to appraise the stability of trees to select where and when a maintenance task is required to increase the functionally useful period of the tree. Torsion is often ignored during static bending trials and the goal of this study was to determine if first-order branches on open grown trees are laterally balanced. It is not known if lateral branch development leads to a parent branch that is evenly balanced. Second-order branch mass and center of gravity were measured and used to estimate the load acting on first-order branches. It appears that de

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Gabzdyl, Martin. "Comparison of the tree species select classification methods from aerial photo." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 56, no. 5 (2008): 279–92. http://dx.doi.org/10.11118/actaun200856050279.

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This article describes a comparison of various programs for the automatic supervised classification used for identification of forest tree species representation from the aerial photographs. These programs were represented by American software Erdas Imagine 8.4, Czech products LuciaG 4.0 and TopoL DMT 6.014. The study displays a minor production forest area with proportion of four most frequently occurring tree species – spruce, larch, oak and ash in the research area of the forest region around Bystřice pod Hostýnem, the Czech Republic. For the reason of lower quality of spectrozonal photogra

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Vitt, Laurie J. "Ecology and life history of the scansorial arboreal lizard Plica plica (Iguanidae) in Amazonian Brazil." Canadian Journal of Zoology 69, no. 2 (1991): 504–11. http://dx.doi.org/10.1139/z91-077.

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A field study on two populations of the tropical iguanid lizard Plica plica in the Brazilian Amazon revealed that this lowland forest species is diurnal, occurs on vertical smooth-barked trunks of the largest trees in the forest, and feeds mostly on ants. Comparisons between rainy season samples from Pará and dry season samples from Rondonia show that even though lizards ate, on average, the same number of prey, prey were larger in Rondonia and prey diversity was greater in Pará. Lizards sleep on tree trunks or similar surfaces when available, apparently leaving the trees only to deposit eggs.

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13

Ezenwenyi, J. U., and O. Chukwu. "Effects of slenderness coefficient in crown area prediction for Tectona grandis Linn. f. in Omo Forest Reserve, Nigeria." Current Life Sciences 3, no. 4 (2017): 65–71. https://doi.org/10.5281/zenodo.996326.

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Crown area which is crown size, is closely related to the photosynthetic capacity of tree and it is an important parameter to characterize biomass, leaf area and wildlife habitats. Conversely, assessment of crown dimensions still remain one of the most difficult and tedious task in forestry. The difficult measurements and the sensitivity of crown dimension on management makes it desirable to develop estimation procedures based on variables that are easier to measure than crown extension itself. The main objective of this study was to develop and observe the effects of tree slenderness coeffici

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14

MacDonald, G. B., and R. R. Forslund. "Application of a geometrical volume equation to species with different bole forms." Canadian Journal of Forest Research 16, no. 2 (1986): 311–14. http://dx.doi.org/10.1139/x86-052.

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Stem analysis of 20 Abiesbalsamea (L.) Mill., 68 Piceamariana (Mill.) B.S.P., 19 Piceaglauca (Moench) Voss, 31 Populustremuloides Michx., and 37 Betulapapyrifera Marsh. revealed form variation between species. A volume equation based on the paracone (a geometrical solid midway between a paraboloid and a cone) estimated individual tree volume within 10% of the true volume (at the 95% confidence level) for all species. The input variables required were total height and diameter at a relative height of 0.2 for Betulapapyrifera and 0.3 for the other four species. If breast-height diameter was used

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15

Silva, V. A., and J. M. Gonçalves. "The Modernization of a Large Irrigation Perimeter to Support Rural Sustainable Development - study Case of Matala (South of Angola)." Agrociencia 19, no. 3 (2015): 42. http://dx.doi.org/10.31285/agro.19.268.

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Matala Irrigation Perimeter (MIP), located in the Cunene river basin, Huíla Province, South of Angola, is under a modernization process, managed by the Angola government. It aims a sustainable rural development, focusing on the socioeconomically aspects and the reduction of poverty of the local populations. This paper describes the MIP and presents the main results of a research study carried out to evaluate this process to establish actions for its improvement. It includes procedures for better water use at conveyance network and on-farm levels, and for higher land productivity through the im

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16

Polewski, P., W. Yao, M. Heurich, P. Krzystek, and U. Stilla. "DETECTION OF SINGLE STANDING DEAD TREES FROM AERIAL COLOR INFRARED IMAGERY BY SEGMENTATION WITH SHAPE AND INTENSITY PRIORS." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-3/W4 (March 11, 2015): 181–88. http://dx.doi.org/10.5194/isprsannals-ii-3-w4-181-2015.

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Standing dead trees, known as snags, are an essential factor in maintaining biodiversity in forest ecosystems. Combined with their role as carbon sinks, this makes for a compelling reason to study their spatial distribution. This paper presents an integrated method to detect and delineate individual dead tree crowns from color infrared aerial imagery. Our approach consists of two steps which incorporate statistical information about prior distributions of both the image intensities and the shapes of the target objects. In the first step, we perform a Gaussian Mixture Model clustering in the pi

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17

Balaji, G. C., S. S. Vivek, P. A. Edwin Fernando, B. Karthikeyan, P. Jaishankar, and V. Rathinakumar. "Structural Optimization of RC Columns in a Multi-storeyed Building by Tree-Columns Subjected to Lateral Loads." E3S Web of Conferences 405 (2023): 03001. http://dx.doi.org/10.1051/e3sconf/202340503001.

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It has become the agenda to use the bottom storey as the parking area in the multi-storey buildings and it has been quite a disturbance caused by RCC columns occupying more while projecting down to the ground. To get rid of this disturbance and for the aesthetic appearance, the number of columns in the bottom storey has to be reduced so that number of the footing will also get reduced. To achieve this, the five-storey RCC framed structure of plan area 30m X 33m which is assumed to be situated in Chennai with each storey height of 4m is modelled in STAAD Pro software in the way that the loads f

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18

Aguado, Txetxu. "Spanish state terrorism: Writing the story of its violence." International Journal of Iberian Studies 36, no. 3 (2023): 221–31. http://dx.doi.org/10.1386/ijis_00107_1.

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Basque society has been exposed to the terrorist violence of the Spanish state during and after the dictatorship and to that of ETA until its definitive cessation of violence on 21 October 2011. The search for the truth demands revealing the existence of state terrorism, regardless of how some historians attempt to diminish its gravity. In this article, the focus will be on cultural productions that make the writing of the history of terrorism in Spain more nuanced. The cultural texts studied include Pablo Malo’s film, Lasa eta Zabala (‘Lasa and Zabala’) (2014), Ion Arretxe’s novel Intxaurrond

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19

Stefen, Clara, Jörg Habersetzer, and Ulrich Witzel. "Biomechanical aspects of incisor action of beavers ( Castor fiber L.)." Journal of Mammalogy 97, no. 2 (2016): 619–30. http://dx.doi.org/10.1093/jmammal/gyv209.

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Abstract Beavers are known for their gnawing performance, e.g., felling trees. Even though this is well known, the biomechanics of it are not, and so this is the focus of this study. The lower incisors work as main cutting tools so that their technical parameters were studied. There are 3 angles (adding to 90°) of importance in cutting: 1) the wedge angle, the angle of the incisor tip; 2) the clearance angle between tooth and material (tree trunk); and 3) the chip angle between incisor tip and the perpendicular to the surface of the trunk. Cutting is usually oblique to the wood fibers. For tec

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Matkowski, Adam, Radosław Karwowski, and Beata Zagórska-Marek. "Two algorithms of determining the middle point of the shoot apex by surrounding organ primordia positions and their usage for computer measurements of divergence angles." Acta Societatis Botanicorum Poloniae 67, no. 2 (2014): 151–59. http://dx.doi.org/10.5586/asbp.1998.017.

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The measurements of the divergence angle between organ primordia in magnolia floral apices and vegetative apices (embryonic shoots) of coniferous trees were performed, using computer application Phyl for IRIX. It appears that the values of the angle are strongly affected by the position of the apex centre, which was calculated by the program on a base of input positions of surrounding primordia. Two algorithms were used to determine the centre position: in program version Phyl 1 it was calculated as the gravity centre whereas in Phyl 2 version as a geometrical midpoint. The both methods differ

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Baesens, C., and R. S. Mackay. "Uniformly travelling water waves from a dynamical systems viewpoint: some insights into bifurcations from Stokes’ family." Journal of Fluid Mechanics 241 (August 1992): 333–47. http://dx.doi.org/10.1017/s0022112092002064.

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Numerical work of many people on the bifurcations of uniformly travelling water waves (two-dimensional irrotational gravity waves on inviscid fluid of infinite depth) suggests that uniformly travelling water waves have a reversible Hamiltonian formulation, where the role of time is played by horizontal position in the wave frame. In this paper such a formulation is presented. Based on this viewpoint, some insights are given into bifurcations from Stokes’ family of periodic waves. It is demonstrated numerically that there is a ‘fold point’ at amplitude A0 ≈ 0.40222. Assuming non-degeneracy of t

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Moreira de Oliveira Jr, Montauban, Geovane Matheus Lemes Andrade, Eliel Roger da Silva, and Jean-Guillaume Eon. "Vertex collisions in 3-periodic nets of genus 4." Acta Crystallographica Section A Foundations and Advances 74, no. 5 (2018): 600–607. http://dx.doi.org/10.1107/s2053273318009956.

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Unstable nets, by definition, display vertex collisions in any barycentric representation, among which are approximate models for the associated crystal structures. This means that different vertex lattices happen to superimpose when every vertex of a periodic net is located at the centre of gravity of its first neighbours. Non-crystallographic nets are known to be unstable, but crystallographic nets can also be unstable and general conditions for instability are not known. Moreover, examples of unstable nets are still scarce. This article presents a systematic analysis of unstable 3-periodic

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Iverson, Louis, Matthew Peters, Anantha Prasad, and Stephen Matthews. "Analysis of Climate Change Impacts on Tree Species of the Eastern US: Results of DISTRIB-II Modeling." Forests 10, no. 4 (2019): 302. http://dx.doi.org/10.3390/f10040302.

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Forests across the globe are faced with a rapidly changing climate and an enhanced understanding of how these changing conditions may impact these vital resources is needed. Our approach is to use DISTRIB-II, an updated version of the Random Forest DISTRIB model, to model 125 tree species individually from the eastern United States to quantify potential current and future habitat responses under two Representative Concentration Pathways (RCP 8.5 -high emissions which is our current trajectory and RCP 4.5 -lower emissions by implementing energy conservation) and three climate models. Climate ch

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Zhan, Xu, Yong Cai, Heng Li, Yangmin Li, and Ping He. "A point cloud registration algorithm based on normal vector and particle swarm optimization." Measurement and Control 53, no. 3-4 (2019): 265–75. http://dx.doi.org/10.1177/0020294019858217.

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Based on normal vector and particle swarm optimization (NVP), a point cloud registration algorithm is proposed by searching the corresponding points. It provides a new method for point cloud registration using feature point registration. First, in order to find the nearest eight neighbor nodes, the k-d tree is employed to build the relationship between points. Then, the normal vector and the distance between the point and the center gravity of eight neighbor points can be calculated. Second, the particle swarm optimization is used to search the corresponding points. There are two conditions to

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Vojáčková, Barbora, Jan Tippner, Robert Mařík, Mojtaba Hassan Vand, Thiéry Constant, and Jana Dlouhá. "Effect of Geometry Precision and Load Distribution on Branch Mechanical Response." Forests 14, no. 5 (2023): 930. http://dx.doi.org/10.3390/f14050930.

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Tree risk assessment requires mechanical response studies, but simplification of the shape, material, or boundary conditions is necessary when dealing with such complex structures. To observe overall tree response, sub-structuring to several levels of detail can be used, enabled by recent developments in numerical methods and three-dimensional laser scanning (3D scan). This study aimed to determine an appropriate level of geometry and loading simplification allowed for high-order branches at the crown border, which is useful for the mechanical analysis of structured tree models. Four higher-or

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Kholiavchuk, Dariia, and Volodymyr Zelenchuk. "Bioindication of the dangerous geomorphological processes’ activity centers (on the example of the central part of the Chornohora massif)." Науковий вісник Чернівецького університету : збірник наукових праць, no. 826 (November 27, 2020): 28–36. http://dx.doi.org/10.31861/geo.2020.826.28-36.

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Rapid climate change in the Ukrainian Carpathians has triggered the intensity and recurrence of geomorphological processes that in turn has changed the vertical structure of landscape complexes. Forest ecosystems serve apparent indicators of the processes. Accordingly, the study aims to identify the spatio-temporal features of avalanche processes, landslides, rock falls using bioindication in the central part of the Chornogora massif in the Ukrainian Carpathians. The main reasons for the intensification of current geomorphological processes include 1) climatic changes and variability in the co

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Wang, Juan, Yinghua Yao, Yinggui Zhang, and Ximing Wang. "Optimization of Railway Mixed Goods Loading Layout considering Stability." Computational Intelligence and Neuroscience 2022 (August 21, 2022): 1–11. http://dx.doi.org/10.1155/2022/1517280.

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It is well known that stability, center-of-gravity balance, and concentrated-weight are key factors of the transportation safety. The reasonable formulation of the loading layout scheme ensures the safety of shipment based on fully utilizing the effective volume and load capacity of freight vehicles. This paper takes the railway mixed goods loading layout as the research object, considering the constraints such as goods loading center-of-gravity balance, the allowable moment of concentrated-weight, supporting and goods placement mode, and taking the maximum comprehensive utilization rates for

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Ласточкин, Д. М., Ю. Н. Сидыганов, В. И. Кретинин, and А. A. Медяков. "Analysis of the vibration frequency of a vertically held tree on a vibration suspension." Известия СПбЛТА, no. 249 (September 1, 2024): 220–29. http://dx.doi.org/10.21266/2079-4304.2024.249.220-229.

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В статье приводится анализ частоты колебаний вертикально удерживаемого дерева разной высоты на виброподвесе, который позволяет определить условия, при которых вертикальное дерево сохранит свою устойчивость. Были рассмотрены механические системы в виде математического и физического перевернутых маятников. В расчете при максимальной идеализации вся масса вертикально удерживаемого дерева была сосредоточена в его центре тяжести. В расчете на основе физического маятника в первом случае идеализация дерева была проведена в виде равномерного распределения массы ствола и вершины дерева по высоте, во вт

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Zhan, Xu, Yong Cai, and Ping He. "A three-dimensional point cloud registration based on entropy and particle swarm optimization." Advances in Mechanical Engineering 10, no. 12 (2018): 168781401881433. http://dx.doi.org/10.1177/1687814018814330.

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A three-dimensional (3D) point cloud registration based on entropy and particle swarm algorithm (EPSA) is proposed in the paper. The algorithm can effectively suppress noise and improve registration accuracy. Firstly, in order to find the k-nearest neighbor of point, the relationship of points is established by k-d tree. The noise is suppressed by the mean of neighbor points. Secondly, the gravity center of two point clouds is calculated to find the translation matrix T. Thirdly, the rotation matrix R is gotten through particle swarm optimization (PSO). While performing the PSO, the entropy in

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Naithani, Kapil, and Rajesh Dangwal. "Application of interval-valued triangular fuzzy numbers and their functional to the healthcare problems." Dependability 21, no. 1 (2021): 23–33. http://dx.doi.org/10.21683/1729-2646-2021-21-1-23-33.

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Aim. In healthcare field there exist different types of uncertainty due to medical error generated by human and technologies. In general the crisp value generate loss of precision and inaccuracy about result and therefore the available data is not sufficient to assessed clinical process up to desired degree of accuracy. Therefore fuzzy set theory play as an important and advance role in accuracy of results in healthcare related problems. Methods. Here for more accuracy of result, we use functional fuzzy numbers in this paper. This study uses a new fuzzy fault tree analysis for patient safety r

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Zhang, Chong, Jiawei Zhou, Huiwen Wang, et al. "Multi-Species Individual Tree Segmentation and Identification Based on Improved Mask R-CNN and UAV Imagery in Mixed Forests." Remote Sensing 14, no. 4 (2022): 874. http://dx.doi.org/10.3390/rs14040874.

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High-resolution UAV imagery paired with a convolutional neural network approach offers significant advantages in accurately measuring forestry ecosystems. Despite numerous studies existing for individual tree crown delineation, species classification, and quantity detection, the comprehensive situation in performing the above tasks simultaneously has rarely been explored, especially in mixed forests. In this study, we propose a new method for individual tree segmentation and identification based on the improved Mask R-CNN. For the optimized network, the fusion type in the feature pyramid netwo

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Domański, Roman. "The Impact of Football Teams’ Transportation on the Carbon Footprint for Away Matches." Sustainability 16, no. 11 (2024): 4721. http://dx.doi.org/10.3390/su16114721.

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Problem: Participating in professional sport involves constant travel. From a review of the literature, the issue of transport in sport (passenger transport) in generating a carbon footprint has already been noted. A reliable assessment of the scale of this phenomenon is currently underway. The aim of this article is to assess the carbon footprint of transporting football players to away matches. It is complemented by a proposal to change the way matches are played using the Sports Centre concept. Methods: A systematic literature review was carried out in the theoretical part. The research par

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Hedden, R. L., T. S. Fredericksen, and S. A. Williams. "Modeling the effect of crown shedding and streamlining on the survival of loblolly pine exposed to acute wind." Canadian Journal of Forest Research 25, no. 5 (1995): 704–12. http://dx.doi.org/10.1139/x95-078.

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A simulation model using empirical data was developed to determine the effect of crown shedding and streamlining from stem and branch bending on the survival of mature loblolly pine (Pinustaeda L.) trees exposed to acute wind. Data collected from tree winching experiments were used to derive the forces necessary to cause stem failure. These data, combined with data on the vertical distribution of biomass and frontal surface area of sampled trees and hypothetical within-stand wind profiles, were used to calibrate models of static wind effect. Data collected on crown biomass, stem deflection, an

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Gao, Yanpeng, and Wenjun Chen. "Evolution and Influencing Factors of Township Spatial Form: A Two-Dimensional Perspective." Complexity 2020 (June 19, 2020): 1–12. http://dx.doi.org/10.1155/2020/5617545.

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The countryside is the habitat of food, ecology, and culture, and the indispensable basis for human survival and development. Assessing the spatial and temporal evolution of rural settlements contributes to the promotion of rural scientific developments. This study used the fractal theory, center-of-gravity model, and spatial syntax to analyze the spatial and temporal evolution of Shenyang Ciyutuo Subdistrict and its influencing factors based on geospatial data from 2009‒2019, from the perspectives of internal characteristics and external morphological changes. In terms of the external charact

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Agmon-Snir, H., and I. Segev. "Signal delay and input synchronization in passive dendritic structures." Journal of Neurophysiology 70, no. 5 (1993): 2066–85. http://dx.doi.org/10.1152/jn.1993.70.5.2066.

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1. A novel approach for analyzing transients in passive structures called "the method of moments" is introduced. It provides, as a special case, an analytic method for calculating the time delay and speed of propagation of electrical signals in any passive dendritic tree without the need for numerical simulations. 2. Total dendritic delay (TD) between two points (y, x) is defined as the difference between the centroid (the center of gravity) of the transient current input, I, at point y[tI(y)] and the centroid of the transient voltage response, V, at point x [tV(x)]. The TD measured at the inp

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Ji, Yiwen, Lang Zhang, Xinchen Gu, and Lei Zhang. "Study on the Spatial and Temporal Evolution of Regional Green Space Morphology Outside Built-Up Areas based on the Google Earth Engine and Biophysical Component Modeling." Land 12, no. 12 (2023): 2184. http://dx.doi.org/10.3390/land12122184.

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The spatial pattern of regional green space is an important dimension to describe and quantitatively express the characteristics of regional green spaces outside the built-up area of a city. With the expansion of urban and rural construction land, regional green space has been continuously encroached upon. This leads to a decline in regional ecological well-being and the loss of biodiversity. Based on the remote sensing data of Shanghai city from 2000 to 2020, we quantitatively studied the spatial morphological change characteristics of regional green space outside the built-up area of Shangha

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Lorenz, Christof, Harald Kunstmann, Balaji Devaraju, Mohammad J. Tourian, Nico Sneeuw, and Johannes Riegger. "Large-Scale Runoff from Landmasses: A Global Assessment of the Closure of the Hydrological and Atmospheric Water Balances*." Journal of Hydrometeorology 15, no. 6 (2014): 2111–39. http://dx.doi.org/10.1175/jhm-d-13-0157.1.

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Abstract The performance of hydrological and hydrometeorological water-balance-based methods to estimate monthly runoff is analyzed. Such an analysis also allows for the examination of the closure of water budgets at different spatial (continental and catchment) and temporal (monthly, seasonal, and annual) scales. For this analysis, different combinations of gridded observations [Global Precipitation Climatology Centre (GPCC), Global Precipitation Climatology Project (GPCP), Climate Prediction Center (CPC), Climatic Research Unit (CRU), and University of Delaware (DEL)], atmospheric reanalysis

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Yang, Jingtian, Pan Jiang, Yi Huang, Yulin Yang, Rulin Wang, and Yuxia Yang. "Potential geographic distribution of relict plant Pteroceltis tatarinowii in China under climate change scenarios." PLOS ONE 17, no. 4 (2022): e0266133. http://dx.doi.org/10.1371/journal.pone.0266133.

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Pteroceltis tatarinowii (Pteroceltis: Ulmaceae) is a deciduous tree that has a cultivation history of more than 2000 years in China. As an excellent afforestation tree species and rare and endangered tertiary relic plant, P. tatarinowii has high ecological protection value. Due to the forest destruction caused by predatory logging and natural environmental factors, the population of P. tatarinowii in China has decreased significantly. In this study, the potential geographical distribution of P. tatarinowii in China under climate change was predicted using MaxEnt model and ArcGIS based on 223 e

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Li, Wenhui, Dongjie Fu, Fenzhen Su, and Yang Xiao. "Spatial–Temporal Evolution and Analysis of the Driving Force of Oil Palm Patterns in Malaysia from 2000 to 2018." ISPRS International Journal of Geo-Information 9, no. 4 (2020): 280. http://dx.doi.org/10.3390/ijgi9040280.

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Oil palm is the main cash crop grown in Malaysia, and palm oil plays an important role in the world oil market. A number of studies have used multisource remote sensing data to conduct research on oil palms in Malaysia, but there are a lack of long-term oil palm mapping studies, especially when the percentage of oil palm tree cover was higher than other plantations in Malaysia during the period of 2000–2012. To overcome this limitation, we used the Google Earth Engine platform to perform oil palm classification based on Landsat reflectance data. The spatial distribution of oil palms in Malaysi

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Schewe, Manfred. "Theatre and Obstinacy – a Friend’s Perspective." Scenario: A Journal of Performative Teaching, Learning, Research IX, no. 1 (2015): 144–47. http://dx.doi.org/10.33178/scenario.9.1.9.

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If somebody living in Dublin and preparing a solo-performance for an academic audience in Cork retreats to a location in Berlin to rehearse for his upcoming show – isn’t that somewhat peculiar? One evening in the winter of 1801 I met an old friend in a public park.2 That is the beginning of the text my friend Peter was reciting as he strolled through the Kleistpark in Berlin. I imagine the way he circles, at a leisurely pace, around the green, time and again pausing at a verge or under one of the mighty beech-trees to practise a gesture or test a graceful move. Each movement, he told me, has i

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Qian, Yanping, and Zhen Wu. "Study on Urban Expansion Using the Spatial and Temporal Dynamic Changes in the Impervious Surface in Nanjing." Sustainability 11, no. 3 (2019): 933. http://dx.doi.org/10.3390/su11030933.

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Impervious surface area is a key factor affecting urbanization and urban environmental quality. It is of great significance to analysis timely and accurately the dynamic changes of impervious surface for urban development planning. In this study, we use a comprehensive method to extract the time series data on the impervious surface area (ISA) from the multi-temporal Landsat remote sensing images with a high overall accuracy of 90%. The processes and mechanisms of urban expansion at different political administration and direction level in the Nanjing metropolitan area are investigated by usin

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Koppad, A. G., Gowri B. Gowda, Rachana, and Anup Das. "Assessment of Forest Above Ground Biomass with SAR Data Using Linear Modeling in Joida Taluk, Uttara Kannada, India." International Journal of Environment and Climate Change 14, no. 12 (2024): 241–59. https://doi.org/10.9734/ijecc/2024/v14i124622.

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The study was conducted in Joida taluk of Uttara Kannada district to assess the forest aboveground biomass using L band data. In this study, an attempt was made to estimate the aboveground biomass using SAR backscatter. The study area covered dense, moderately dense, and sparse forests. Nearly 0.01 percent of the forest area was sampled through 30 sampling plots. The point center quadrate (PCQ) method was used to select the tree and collected the tree growth parameters viz., tree height, diameter at breast height (DBH), and diameter at the tree base. The sampling plots were randomly selected i

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McGonagle, Declan, and David Brett. "Centre of Gravity." Circa, no. 60 (1991): 26. http://dx.doi.org/10.2307/25557675.

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Jiang, Jianjun, Yi Xiao, Wenhao Zhan, et al. "An HRA Model Based on the Cognitive Stages for a Human-Computer Interface in a Spacecraft Cabin." Symmetry 14, no. 9 (2022): 1756. http://dx.doi.org/10.3390/sym14091756.

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HRA (Human Reliability Analysis) can be seen as a symmetric problem, as it is mainly reflected in two aspects of failure and success. Human error is the most common accident in industrial systems; furthermore, an astronaut is in a very complex environment, and coupled with weightlessness, it is easy to cause human error. For this reason, this paper took the human-computer interface in a spacecraft cabin as the background, and based on the literature, questionnaire inquiry, and the division of three cognitive processes during the interaction between the astronaut and human, a computer interface

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Wang, Quanxi, Jun Ren, Maomao Zhang, Hongjun Sui, and Xiaodan Li. "Synergistic Matching and Influencing Factors of Grain Production and Cropland Net Primary Productivity in the Black Soil Region of Northeast China." Agronomy 14, no. 12 (2024): 2932. https://doi.org/10.3390/agronomy14122932.

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Exploring the spatiotemporal dynamics, spatial mismatch, and complex influencing mechanism of grain production and cropland productivity in the black soil region of northeast China (BSRNC) is essential for the synergistic protection and utilization of black soil cropland and sustainable grain production. The BSRNC has realized cropland expansion and grain production increases in the past decades. This implied a substantial investment has been made in the region’s agriculture. However, at present, knowledge on the spatial mismatch and influencing factors of grain production and cropland product

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Zhao, Huihui, Caifeng Yang, Miao Lu, Longhao Wang, and Bing Guo. "Patterns and Dominant Driving Factors of Carbon Storage Changes in the Qinghai–Tibet Plateau under Multiple Land Use Change Scenarios." Forests 15, no. 3 (2024): 418. http://dx.doi.org/10.3390/f15030418.

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Revealing the spatial–temporal evolution of carbon storage and its driving mechanisms in the Qinghai–Tibet Plateau could provide support for decision making in the protection of regional ecosystems and the achievement of regional dual-carbon goals. In this study, the spatial–temporal evolution of carbon storage in the Qinghai–Tibet Plateau was analyzed under various scenarios using PLUS-InVEST and a gravity center model, and the driving mechanisms of carbon storage were clarified with Geodetector. The results are as follows: (1) During 2000–2020, the areas of coniferous forest, evergreen broad

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Aldama, Mariana Espinosa. "The gravity apple tree." Journal of Physics: Conference Series 600 (April 28, 2015): 012050. http://dx.doi.org/10.1088/1742-6596/600/1/012050.

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Li, Li, Zhaoyun Wu, Zhongwei Zhang, and Yulan Zhang. "An Optimization Method for CNC Laser Combination Cutting of Irregular Plate Remainders." Coatings 13, no. 5 (2023): 914. http://dx.doi.org/10.3390/coatings13050914.

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The key research question in this study is how to cut pieces in irregular plate remainders, because there are many irregular plate leftovers created during the CNC (Computer Numerical Control) process. This will increase material utilization and allow plate leftovers to be reused. One of the issues being researched is how to arrange plate remainders on the surface of the CNC machine; this issue is known as combination layout optimization. The other issue being researched is combination cutting-path optimization of plate remainders, which aims to determine the cutting path of parts of plate rem

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Gladkov, S. O. "About the Centre of Gravity and Centre of Mass." Physics in Higher Education 28, no. 4 (2022): 165–70. http://dx.doi.org/10.54965/16093143_2022_28_4_165.

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Tóth, Géza, and Zoltán Nagy. "The world’s economic centre of gravity." Regional Statistics 6, no. 2 (2016): 177–80. http://dx.doi.org/10.15196/rs06210.

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