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Journal articles on the topic 'The level of disturbance'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Pu, Cuiping, Yicheng Zhu, and Jianbo Su. "Drum Water Level Control Based on Improved ADRC." Algorithms 12, no. 7 (2019): 132. http://dx.doi.org/10.3390/a12070132.

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Drum water level systems show strong disturbance, big inertia, large time delay, and non-linearity characteristics. In order to improve the antidisturbance performance and robustness of the traditional active disturbance rejection controller (ADRC), an improved linear active disturbance rejection controller (ILADRC) for drum water level is designed. On the basis of the linear active disturbance rejection controller (LADRC) structure, an identical linear extended state observer (ESO) is added with the same parameters as that of the original one. The estimation error value of the total disturban

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2

Meng, Xiangxiang, Haisheng Yu, Herong Wu, and Tao Xu. "Disturbance Observer-Based Integral Backstepping Control for a Two-Tank Liquid Level System Subject to External Disturbances." Mathematical Problems in Engineering 2020 (January 20, 2020): 1–22. http://dx.doi.org/10.1155/2020/6801205.

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A novel method of disturbance observer-based integral backstepping control is proposed for the two-tank liquid level system with external disturbances. The problem of external disturbances can be settled in this paper. Firstly, the mathematical model of the two-tank liquid level system is established based on fluid mechanics and principle of mass conservation. Secondly, an integral backstepping control strategy is designed in order to ensure liquid level tracking performance by making the tracking errors converge to zero in finite time. Thirdly, a disturbance observer is designed for the two-t

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Zhang, Yong Gang, Ming Yang Sun, Xian Feng Xu, and Wei Jin Zhuang. "Identification of the Maximum Wind Penetration Level during Over-Frequency Disturbances." Advanced Materials Research 805-806 (September 2013): 364–69. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.364.

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Todays power system is integrating increasingly variable and uncertain generation resources, especially wind power. As much of wind generators in the market contribute little or none to system inertia, power system is operated much closer to its dynamic security margin. To identify the maximum wind penetration of a power system following a pre-defined disturbance, the impact of increased wind penetration on post-disturbance stability is studied. In this paper, the disturbance is simulated by a short circuit that leads to the sudden disconnection of a large amount of load demand. When wind powe

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Перевалова, Наталья, Natalia Perevalova, Илья Едемский, et al. "Dynamics of the level of total electron content disturbance at high and middle latitudes according to GPS data." Solar-Terrestrial Physics 2, no. 1 (2016): 50–60. http://dx.doi.org/10.12737/19878.

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We study the level of total electron content (TEC) disturbance in ionospheric mid-latitude and high-latitude regions, which occurred during 2013. TEC behavior is calculated using data from two GPS stations: MOND (Mondy) and NRIL (Norilsk). TEC variations are estimated from dual-frequency phase measurements for all radio signal paths. We analyze the TEC variations in two time ranges: 10 and 40 min. These ranges correspond to medium- and large-scale ionospheric disturbances respectively. The TEC disturbance level is characterized using a special index WTEC. It allows us to receive multi-day cont

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Norderhaug, KM, K. Filbee-Dexter, C. Freitas, et al. "Ecosystem-level effects of large-scale disturbance in kelp forests." Marine Ecology Progress Series 656 (December 10, 2020): 163–80. http://dx.doi.org/10.3354/meps13426.

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Understanding the effects of ecological disturbances in coastal habitats is crucial and timely as these are anticipated to increase in intensity and frequency in the future due to increasing human pressure. In this study we used directed kelp trawling as a scientific tool to quantify the impacts of broad-scale disturbance on community structure and function. We tested the ecosystem-wide effects of this disturbance in a BACI design using two 15 km2 areas. The disturbance had a substantial impact on the kelp forests in this study, removing 2986 tons of kelp and causing a 26% loss of total kelp c

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Wang, Qiaochu, Wang Hongwei, Yang Zhang, Nengsong Zou, and Zhixuan Huang. "Metro noise-induced activity disturbances and their water sound-based countermeasures." Noise Control Engineering Journal 72, no. 3 (2024): 210–27. http://dx.doi.org/10.3397/1/377220.

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With the rapid renewal and development of metro lines, the activity disturbances caused by metro noise inside buildings have attracted much attention. A large number of studies have explored the activity disturbances induced by aboveground railway or road traffic noises, there is a lack of research assessing the activity disturbances due to metro noise. Accordingly, this study investigated the disturbances induced by metro noise in indoor condition at four noise levels (50, 55, 60 and 65 dBA) in three kinds of stimulation conditions (calculation, judgement and memory) and the regulating effect

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7

Maldonado-Chaparro, A. A., G. Alarcón-Nieto, J. A. Klarevas-Irby, and D. R. Farine. "Experimental disturbances reveal group-level costs of social instability." Proceedings of the Royal Society B: Biological Sciences 285, no. 1891 (2018): 20181577. http://dx.doi.org/10.1098/rspb.2018.1577.

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In group-living species, social stability is an important trait associated with the evolution of complex behaviours such as cooperation. While the drivers of stability in small groups are relatively well studied, little is known about the potential impacts of unstable states on animal societies. Temporary changes in group composition, such as a social group splitting and recombining (i.e. a disturbance event), can result in individuals having to re-establish their social relationships, thus taking time away from other tasks such as foraging or vigilance. Here, we experimentally split socially

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8

Chung, Soon-Cheol, Byung-Chan Min, Chul-Jung Kim, and Zang-Hee Cho. "Effect of Various Disturbances on fMRI: A Study on Visual and Motor Cortices." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 44, no. 21 (2000): 3–497. http://dx.doi.org/10.1177/154193120004402135.

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We have studied the effects of various disturbances of two different levels of difficulty, that is, with weak and with strong difficulty levels for primary visual and motor tasks. In the case of visual task with motor and mental disturbances, we found it decreased as motor and mental disturbance difficulty-level increased, ***compared with the cases without motor and mental disturbances. To the contrary, in the case of motor activity, the total activation of motor cortex with weak and with strong mental disturbance was increased as mental disturbance difficulty-levels increased.

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9

Перевалова, Наталья, Natalia Perevalova, Илья Едемский, et al. "Dynamics of disturbance level of total electron content at high and middle latitudes according to GPS data." Solnechno-Zemnaya Fizika 2, no. 1 (2016): 36–43. http://dx.doi.org/10.12737/13831.

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We study the level of total electron content (TEC) disturbance in ionospheric mid-latitude and high-latitude regions during 2013. TEC behavior is calculated using data from two GPS stations: MOND (Mondy) and NRIL (Norilsk). TEC variations are calculated from two-frequency phase measurements for all radio rays. We analyze the TEC variations in two time ranges: 10 and 40 min. These ranges correspond to middle- and large-scale ionospheric disturbances respectively. The TEC disturbance level is characterized using the special index WTEC. WTEC allows us to receive multi-day continuous series of ave

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10

Meng, Xiangxiang, Haisheng Yu, Tao Xu, and Herong Wu. "Disturbance Observer and L2-Gain-Based State Error Feedback Linearization Control for the Quadruple-Tank Liquid-Level System." Energies 13, no. 20 (2020): 5500. http://dx.doi.org/10.3390/en13205500.

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This paper proposes a fresh state error feedback linearization control method with disturbance observer (DOB) and L2 gain for a quadruple-tank liquid-level system. Firstly, in terms of the highly nonlinear and strong coupling characteristics of the quadruple-tank system, a state error feedback linearization technique is employed to design the controller to achieve liquid-level position control and tracking control. Secondly, DOB is purposed to estimate uncertain exogenous disturbances and applied to compensation control. Moreover, an L2-gain disturbance attenuation technology is designed to re

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11

Felea, Ioan, Simona Dzitac, Tiberiu Vesselenyi, and Ioan Dzitac. "Decision Support Model for Production Disturbance Estimation." International Journal of Information Technology & Decision Making 13, no. 03 (2014): 623–47. http://dx.doi.org/10.1142/s0219622014500576.

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A current modeling framework for disturbance in manufacturing systems (MS) is given by concepts like discrete-event systems, stochastic fluid models and infinitesimal disturbance analysis. The goal of modeling is to achieve control and structural and functional optimization of MS. Objective functions of these optimization models are focused on quantities which reflect the level of reliability, the level of manufactured products, the quality of products or the impact on the environment of MS with disturbances. These models do not allow a dynamic evaluation of consequences of the disturbances wh

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12

Gao, Aimin, and Xiaobo Cui. "Active Disturbance Rejection Control Design with Sensitivity Constraint for Drum Water Level." Energies 17, no. 6 (2024): 1438. http://dx.doi.org/10.3390/en17061438.

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The drum water level plays a crucial role in the safety and economy of heat recovery boilers. However, the control of the drum water level faces many challenges, such as external disturbances and system uncertainties. To enhance the control performance of the drum water level, a modified active disturbance rejection control (MADRC) optimized with sensitivity constraint is proposed in this paper. Firstly, the control structure of the three-element control system for the drum water level is introduced and analyzed. Based on the regular active disturbance rejection control (ADRC) structure, the s

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13

Haywood, A., J. Verbesselt, and P. J. Baker. "MAPPING DISTURBANCE DYNAMICS IN WET SCLEROPHYLL FORESTS USING TIME SERIES LANDSAT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 23, 2016): 633–41. http://dx.doi.org/10.5194/isprs-archives-xli-b8-633-2016.

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In this study, we characterised the temporal-spectral patterns associated with identifying acute-severity disturbances and low-severity disturbances between 1985 and 2011 with the objective to test whether different disturbance agents within these categories can be identified with annual Landsat time series data. We analysed a representative State forest within the Central Highlands which has been exposed to a range of disturbances over the last 30 years, including timber harvesting (clearfell, selective and thinning) and fire (wildfire and prescribed burning). We fitted spectral time series m

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14

Haywood, A., J. Verbesselt, and P. J. Baker. "MAPPING DISTURBANCE DYNAMICS IN WET SCLEROPHYLL FORESTS USING TIME SERIES LANDSAT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 23, 2016): 633–41. http://dx.doi.org/10.5194/isprsarchives-xli-b8-633-2016.

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In this study, we characterised the temporal-spectral patterns associated with identifying acute-severity disturbances and low-severity disturbances between 1985 and 2011 with the objective to test whether different disturbance agents within these categories can be identified with annual Landsat time series data. We analysed a representative State forest within the Central Highlands which has been exposed to a range of disturbances over the last 30 years, including timber harvesting (clearfell, selective and thinning) and fire (wildfire and prescribed burning). We fitted spectral time series m

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15

Tyson, William, Trevor C. Lantz, and Natalie C. Ban. "Cumulative Effects of Environmental Change on Culturally Significant Ecosystems in the Inuvialuit Settlement Region + Supplementary Appendices 1 to 3 (See Article Tools)." ARCTIC 69, no. 4 (2016): 391. http://dx.doi.org/10.14430/arctic4607.

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The Inuvialuit Settlement Region (ISR) in the western Canadian Arctic is experiencing environmental changes that affect subsistence harvesting practices and are of concern to local communities. In order to assess the impacts of multiple disturbances on culturally important ecosystems in the ISR, we created a cumulative disturbance map that represents relative intensity of terrestrial disturbances across the study region. We then assessed the relative level of environmental disturbance in important harvesting areas and management zones. Subsequently, we modeled nine future disturbance scenarios

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16

Montaño-Centellas, Flavia, M.Isabel Moya, Luis F. Aguirre, et al. "Community and species-level responses of phyllostomid bats to a disturbance gradient in the tropical Andes." Acta Oecologica 62 (June 12, 2015): 10–17. https://doi.org/10.5281/zenodo.13511215.

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(Uploaded by Plazi for the Bat Literature Project) Understanding animal responses to habitat change and habitat loss is central to the development of conservation and management strategies. Behavioral responses could allow for early detection of animal responses even to small scale disturbances, becoming of increasing importance for conservation. Here, we explore the effects of a low to moderate disturbance gradient on a phyllostomid bat assemblage in a tropical Andean forest of Bolivia, focusing on both community-level (changes in species richness and composition) and species-level (temporal

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17

Montaño-Centellas, Flavia, M.Isabel Moya, Luis F. Aguirre, et al. "Community and species-level responses of phyllostomid bats to a disturbance gradient in the tropical Andes." Acta Oecologica 62 (June 7, 2015): 10–17. https://doi.org/10.5281/zenodo.13511215.

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(Uploaded by Plazi for the Bat Literature Project) Understanding animal responses to habitat change and habitat loss is central to the development of conservation and management strategies. Behavioral responses could allow for early detection of animal responses even to small scale disturbances, becoming of increasing importance for conservation. Here, we explore the effects of a low to moderate disturbance gradient on a phyllostomid bat assemblage in a tropical Andean forest of Bolivia, focusing on both community-level (changes in species richness and composition) and species-level (temporal

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18

Montaño-Centellas, Flavia, M.Isabel Moya, Luis F. Aguirre, et al. "Community and species-level responses of phyllostomid bats to a disturbance gradient in the tropical Andes." Acta Oecologica 62 (July 3, 2015): 10–17. https://doi.org/10.5281/zenodo.13511215.

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(Uploaded by Plazi for the Bat Literature Project) Understanding animal responses to habitat change and habitat loss is central to the development of conservation and management strategies. Behavioral responses could allow for early detection of animal responses even to small scale disturbances, becoming of increasing importance for conservation. Here, we explore the effects of a low to moderate disturbance gradient on a phyllostomid bat assemblage in a tropical Andean forest of Bolivia, focusing on both community-level (changes in species richness and composition) and species-level (temporal

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19

Montaño-Centellas, Flavia, M.Isabel Moya, Luis F. Aguirre, et al. "Community and species-level responses of phyllostomid bats to a disturbance gradient in the tropical Andes." Acta Oecologica 62 (July 10, 2015): 10–17. https://doi.org/10.5281/zenodo.13511215.

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(Uploaded by Plazi for the Bat Literature Project) Understanding animal responses to habitat change and habitat loss is central to the development of conservation and management strategies. Behavioral responses could allow for early detection of animal responses even to small scale disturbances, becoming of increasing importance for conservation. Here, we explore the effects of a low to moderate disturbance gradient on a phyllostomid bat assemblage in a tropical Andean forest of Bolivia, focusing on both community-level (changes in species richness and composition) and species-level (temporal

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20

Lugo, Ariel E. "Effects of Extreme Disturbance Events: From Ecesis to Social–Ecological–Technological Systems." Ecosystems 23, no. 8 (2020): 1726–47. http://dx.doi.org/10.1007/s10021-020-00491-x.

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AbstractEcologists addressed the effects of disturbances from the onset of the field by focusing on ecesis, which is the process by which organisms migrate and establish under the environmental conditions created by disturbances. Ecesis is the onset of succession, a self-organizing process whose nature, speed, and outcome depend in part on the outcomes of ecesis and the residual legacies remaining after disturbances. A by-product of succession after a disturbance is the reorganization of species dominance, or novelty. The degree of novelty in the outcome increases with the severity of the dist

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21

Gao, Fang, and Wenbin Chen. "Mixed Dissipativity Control and Disturbance Rejection for Singular Systems." Journal of Advanced Computational Intelligence and Intelligent Informatics 27, no. 4 (2023): 720–25. http://dx.doi.org/10.20965/jaciii.2023.p0720.

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In this study, for a linear singular system, the dissipativity and disturbance-rejection problems are considered simultaneously. An improved equivalent-input-disturbance (IEID) method has shown good disturbance-rejection performance for linear systems. Therefore, the objective of this study is to obtain a satisfactory disturbance-rejection performance and dissipativity performance level based on the IEID method for singular systems. First, the influence of exogenous disturbances on the system is estimated based on the IEID method. The estimate is added to the control input channel to offset th

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22

Oldfield, Callie, and Chris Peterson. "Aboveground Biomass and Carbon Accumulation 19 Years Post-Windthrow and Salvage Logging." Forests 12, no. 2 (2021): 173. http://dx.doi.org/10.3390/f12020173.

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Natural disturbances shape forest ecosystem characteristics, including carbon storage and structure. Often, natural disturbances are compounded with anthropogenic disturbances, which may alter the trajectory of forest carbon stock recovery. Heterogeneous levels of disturbance severity in compound disturbance events add an additional layer of complexity. This paper examines the effect of a moderate-severity wind disturbance and subsequent salvage logging on forest biomass and carbon stock recovery over 19 years. We investigate the recovery of aboveground tree biomass following a wind disturbanc

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Zhang, H., Z. Zhang, X. Guo, J. Zhao, and Y. Shan. "UNDERSTANDING THE SPATIO-TEMPORAL PATTERN OF FIRE DISTURBANCE IN THE EASTERN MONGOLIA USING MODIS PRODUCT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (April 30, 2018): 1921–24. http://dx.doi.org/10.5194/isprs-archives-xlii-3-1921-2018.

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Fire disturbance plays an important role in maintaining ecological balance, biodiversity and self-renewal. In this paper, the spatio-temporal pattern of fire disturbances in eastern Mongolia are studied by using the ArcGIS spatial analysis method, using the MCD45A1 data of MODIS fire products with long time series. It provides scientific basis and reference for the regional ecological environment security construction and international ecological security. Research indicates: (1) The fire disturbance in eastern Mongolia has obvious high and low peak interleaving phenomenon in the year, and the

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Rentch, James S., Mary Ann Fajvan, and Ray R. Hicks. "Spatial and Temporal Disturbance Characteristics of Oak-Dominated Old-Growth Stands in the Central Hardwood Forest Region." Forest Science 49, no. 5 (2003): 778–89. http://dx.doi.org/10.1093/forestscience/49.5.778.

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Abstract Using a radial growth averaging technique, decadal-scale growth changes of 150- to 350-yr-old overstory oaks were used to identify canopy disturbance events in five old-growth stands, and canopy disturbance intervals were estimated using frequency analysis. Stem maps and tree-establishment and canopy-accession chronologies were then used to reconstruct the size of canopy openings. Between 1700 and 1990, median canopy disturbance interval was approximately 3 yr for each stand; larger disturbances involving two or more trees occurred about every 16 yr per stand. Based on age distributio

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Gonzalez, Darinka Costa, Reinaldo Lucas Cajaiba, Eduardo Périco, et al. "Assessing Ecological Disturbance in Neotropical Forest Landscapes Using High-Level Diversity and High-Level Functionality: Surprising Outcomes from a Case Study with Spider Assemblages." Land 10, no. 7 (2021): 758. http://dx.doi.org/10.3390/land10070758.

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Spiders have been increasingly used as environmental and ecological indicators in conservation and ecosystem management. In the Neotropics, there is a shortage of information regarding spiders’ taxonomies and ecological responses to anthropogenic disturbances. To unravel these hitches, we tested the possibility of using high-level diversity and high-level functionality indicators to evaluate spider assemblages’ sensitivity to landscape changes. This approach, if proven informative, might overcome the relevant limitations of taxonomic derived indexes, which are considered time-consuming, cost-d

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TAULMAN, JAMES F. "Modification of a hierarchical model of forest disturbance." Environmental Conservation 25, no. 1 (1998): 3–7. http://dx.doi.org/10.1017/s0376892998000022.

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A model of disturbance equilibrationThe contemporary ‘non-equilibrium’ paradigm in ecology acknowledges that ecosystems and their component floral and faunal communities show historic dynamism, not unchanging constancy (Shugart & West 1981; Pickett et al. 1992; Hengeveld 1994). In formulating a hierarchical view of landscape ecology, Urban et al. (1987) modelled broad classes of forest disturbances and corresponding landscape scales. A reference level is the scale at which a disturbance is observed as an ‘interesting event’. At the next, lower landscape scale the disturbance has a signific

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27

Zeng, Sheng. "Adaptive Speed Control Design for Brushed Permanent Magnet DC Motor Based on Worst-Case Analysis Approach." Mathematical Problems in Engineering 2013 (2013): 1–15. http://dx.doi.org/10.1155/2013/698050.

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This paper presents the adaptive controller design for brushed permanent magnet DC motor used in velocity-tracking applications based on worst-case approach. We first formulate the robust adaptive control problem as a nonlinearH∞-control problem under imperfect state measurement, and then solve it using game-theoretic approach. The controller guarantees the boundedness of closed-loop signals with bounded exogenous disturbances, and achieves desired disturbance attenuation level with respect to the unmeasured exogenous disturbance inputs and the measured disturbance inputs. The strong robustnes

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Duan, Tingting, Jing Zhang, and Zhengjun Wang. "Responses and Indicators of Composition, Diversity, and Productivity of Plant Communities at Different Levels of Disturbance in a Wetland Ecosystem." Diversity 13, no. 6 (2021): 252. http://dx.doi.org/10.3390/d13060252.

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Grassland tourism is a very popular leisure activity in many parts of the world. However, the presence of people in these areas causes disturbance to the local environment and grassland resources. This study analyzes the composition, diversity, and productivity under different levels of disturbance of the plant communities in the Kangxi Grassland Tourist Area and the Yeyahu Wetland Nature Reserve of Beijing, China. It aims to identify indicators of plant communities and their responses to different levels of disturbance. Our analysis shows that the plant community density and coverage have a c

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Wang, Huan, Shuguang Liu, Maolong Lv, and Boyang Zhang. "Two-Level Hierarchical-Interaction-Based Group Formation Control for MAV/UAVs." Aerospace 9, no. 9 (2022): 510. http://dx.doi.org/10.3390/aerospace9090510.

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Cooperative group formation control of manned/unmanned aircraft vehicles (MAV/UAVs) using a hierarchical framework can be more efficient and flexible than centralized control strategies. In this paper, a two-level hierarchical-interaction-based cooperative control strategy is proposed for the MAV/UAVs group formation. At the upper level, combined with the nonlinear disturbance observer (NDO) and dynamic surface control (DSC) algorithm, a trajectory tracking problem with external disturbances for MAV is formulated. At the lower level, the leader-following formation controller is utilized to dea

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Furqan, Furqan, and Meri Andriani. "Analisis Kebisingan Pada Carnel Station Untuk Meningkatkan Kenyamanan Bekerja Pt.Anugrah Fajar Rezeki." Jurnal Industri Samudra 4, no. 2 (2025): 79–85. https://doi.org/10.55377/jis.v4i2.11503.

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Noise in the industrial work environment is one of the risk factors that can affect worker comfort and productivity. This study aims to analyze the level of disturbance at the Carnel Station at PT. Anugrah Fajar Rezeki in order to improve comfort and work safety. The methodology used includes measuring the intensity of disturbance using a Sound Level Meter (SLM) at several strategic points during factory operating hours. The data obtained are analyzed based on the applicable threshold value (NAB) standards and the maximum exposure time to disturbance is calculated using the NIOSH (National Ins

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Fu, Bo, Bijia You, and Guozhen Hu. "Layered Composite Decoupling Control Based on Regional Dynamic Sparrow Search Algorithm." Processes 11, no. 12 (2023): 3350. http://dx.doi.org/10.3390/pr11123350.

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This paper addresses the issues of coupling and disturbances in a dual-tank water level control system within the context of process control in chemical water treatment at industrial facilities. In response to these challenges, a Layered Composite Decoupling Control system based on the Regional Dynamic Sparrow Search Algorithm (RDSSA-LCDC) is proposed. The utilization of an enhanced Regionally Dynamic Sparrow Search Algorithm (RDSSA) addresses the pitfalls of the Sparrow Search Algorithm (SSA), such as susceptibility to local optima and inadequate precision. RDSSA is employed for the parameter

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Fiana, Dewi Nur. "Habilitation Of Cerebral Palsy Spastic Type + Upper Respiratory Track Infection + Malnutrition + Respiratory Disturbance + Feeding Problem + Mobilization Disturbances + Communication Disturbance." Jurnal Kedokteran Universitas Lampung 4, no. 1 (2020): 80–85. https://doi.org/10.23960/jkunila.v4i1.pp80-85.

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Cerebral Palsy (CP) is a disorder of movement and posture that appear during infancy or early childhood. It is caused by nonprogressive damage to the brain before, during or shortly after birth. CP is not a single disease but a name given to a wide variety of static neuromotor impairment Syndromes occurring. Secondary to a lesion in the developing brain.1 HR, 26 month old boy,was consulted by Pediatric Department on 11-09-2015 with diagnose Epilepsi focal symptomatic + Cerebral Quadriplegi + suspect visupect visual impairment. HR had ad bonam for prognosis quo ad vitam and ad sanationam, but d

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Beal-Neves, Mariana, Cleusa Vogel Ely, Marjorie Westerhofer Esteves, et al. "The Influence of Urbanization and Fire Disturbance on Plant-floral Visitor Mutualistic Networks." Diversity 12, no. 4 (2020): 141. http://dx.doi.org/10.3390/d12040141.

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The biodiversity loss resulting from rising levels of human impacts on ecosystems has been extensively discussed over the last years. The expansion of urban areas promotes drastic ecological changes, especially through fragmentation of natural areas. Natural grassland remnants surrounded by an urban matrix are more likely to undergo disturbance events. Since grassland ecosystems are closely related to disturbances such as fire and grazing, grassland plant communities, pollinators, and their interaction networks may be especially sensitive to urban expansion, because it promotes habitat fragmen

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Schowalter, T. D. "Insect Responses to Major Landscape-Level Disturbance." Annual Review of Entomology 57, no. 1 (2012): 1–20. http://dx.doi.org/10.1146/annurev-ento-120710-100610.

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Makarov, Georgy. "Offsets in the geomagnetic indices of the magnetospheric ring current." Solar-Terrestrial Physics 7, no. 3 (2021): 29–35. http://dx.doi.org/10.12737/stp-73202103.

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The paper considers changes in the daily average values of the Dst, SYM-H, ASY-H, and ASY-D indices and their dependence on the level of magnetic disturbance for the period 1981–2016. These indices are geomagnetic characteristics of the magnetospheric ring current. It has been established that the indices of the asymmetric component of the ring current ASY-H and ASY-D during relatively magnetically quiet periods are not equal to zero. The values of the offsets in the dependences of the ASY-H and ASY-D indices on the level of magnetic disturbance have been determined. The behavior of the index

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Makarov, Georgy. "Offsets in the geomagnetic indices of the magnetospheric ring current." Solnechno-Zemnaya Fizika 7, no. 3 (2021): 31–38. http://dx.doi.org/10.12737/szf-73202103.

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The paper considers changes in the daily average values of the Dst, SYM-H, ASY-H, and ASY-D indices and their dependence on the level of magnetic disturbance for the period 1981–2016. These indices are geomagnetic characteristics of the magnetospheric ring current. It has been established that the indices of the asymmetric component of the ring current ASY-H and ASY-D during relatively magnetically quiet periods are not equal to zero. The values of the offsets in the dependences of the ASY-H and ASY-D indices on the level of magnetic disturbance have been determined. The behavior of the index

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Rayburg, Scott, Melissa Neave, and Justin Thompson-Laing. "The Impact of Flood Frequency on the Heterogeneity of Floodplain Surface Soil Properties." Soil Systems 7, no. 3 (2023): 63. http://dx.doi.org/10.3390/soilsystems7030063.

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Floodplain soils are subject to quasi-periodic flood disturbances. This flooding serves to enrich floodplain soils, increasing their fertility and often making them ideal locations for agriculture. However, what is less well understood is how the frequency of flooding impacts on soil fertility and the diversity of soil character. This study investigates how flood frequency influences the heterogeneity (assessed using 26 physical and geochemical soil properties) of floodplain soils in a semi-arid floodplain wetland system in New South Wales, Australia. The study includes an investigation of soi

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Huang, Qixuan, Jiaxing Zhou, Xiang Chen, Qing Li, and Runjing Chen. "Adaptive Control for a Two-Axis Semi-Strapdown Stabilized Platform Based on Disturbance Transformation and LWOA-PID." Sensors 24, no. 16 (2024): 5198. http://dx.doi.org/10.3390/s24165198.

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A two-axis semi-strapdown stabilized platform is a device designed to eliminate aircraft disturbances and ensure the stability of the sensor’s orientation. A traditional two-axis semi-strapdown stabilization platform for aircraft can effectively control disturbance in pitch and yaw channel, but it cannot achieve ideal disturbance control in the roll channel. In order to solve this problem, an adaptive control method based on disturbance transformation and LWOA-PID is proposed. Disturbance transformation is the process of integrating the angular position disturbance of the roll from the previou

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Wang, Wei, Yiming Chen, Zhang Ren, and Huanhua Liu. "Two-Step Robust Fault-Tolerant Controller Design Based on Nonlinear Extended State Observer (NESO) for Unmanned Aerial Vehicles (UAVs) with Actuator Faults and Disturbances." Drones 9, no. 3 (2025): 183. https://doi.org/10.3390/drones9030183.

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This paper presents a two-step robust fault-tolerant controller of incorporating disturbances and actuator faults rejection for a UAV flight control system, which is challenging due to its complex and nonlinear dynamics. First, the main controller, which is designed separately, considers all the design parameters giving the desired closed loop system response. Second, a method to design a standalone disturbance/fault compensator is suggested, which is integrated into the original system to ensure stability. The degraded system stability and performance are compensated by the compensator, which

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Han, Xue. "Adaptive Neural Backstepping Sliding Mode Heading Control for Underactuated Ships with Drift Angle and Ship-Bank Interaction." Computational Intelligence and Neuroscience 2020 (September 27, 2020): 1–18. http://dx.doi.org/10.1155/2020/8854055.

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In order to track the desired path under unknown parameters and environmental disturbances, an adaptive backstepping sliding mode control algorithm with a neural estimator is proposed for underactuated ships considering both ship-bank interaction effect and shift angle. Using the features of radial basis function neural network, which can approximate arbitrary function, the unknown parameters of the ship model and environmental disturbances are estimated. The trajectory tracking errors include stabilizing sway and surge velocities errors. Based on the Lyapunov stability theory, the tracking er

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Bergeron, Yves, Brian Harvey, Alain Leduc, and Sylvie Gauthier. "Forest management guidelines based on natural disturbance dynamics: Stand- and forest-level considerations." Forestry Chronicle 75, no. 1 (1999): 49–54. http://dx.doi.org/10.5558/tfc75049-1.

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Although the concept of forest ecosystem management based on natural disturbance has generated a great deal of interest, few concrete examples exist of FEM principles being put into application. Silvicultural practices that emulate natural disturbances are proposed with examples from the principal vegetation zones of Quebec. With the exception of the large-scale use of careful logging to protect advanced regeneration in ecosystems generally controlled by fire, stand-level silvicultural practices currently used are reasonably similar to natural disturbances, although important differences exist

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Chen, Xi, Wenzhi Zhao, Jiage Chen, Yang Qu, Dinghui Wu, and Xuehong Chen. "Mapping Large-Scale Forest Disturbance Types with Multi-Temporal CNN Framework." Remote Sensing 13, no. 24 (2021): 5177. http://dx.doi.org/10.3390/rs13245177.

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Forests play a vital role in combating gradual developmental deficiencies and balancing regional ecosystems, yet they are constantly disturbed by man-made or natural events. Therefore, developing a timely and accurate forest disturbance detection strategy is urgently needed. The accuracy of traditional detection algorithms depends on the selection of thresholds or the formulation of complete rules, which inevitably reduces the accuracy and automation level of detection. In this paper, we propose a new multitemporal convolutional network framework (MT-CNN). It is an integrated method that can r

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Zhang, Haibo, Dayi Wang, Chunling Wei, and Bing Xiao. "End-Effector Trajectory Tracking Control of Space Robot withL2Gain Performance." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/175342.

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This paper presents a novel solution to the control problem of end-effector robust trajectory tracking for space robot. External disturbance and system uncertainties are addressed. For the considered robot operating in free-floating mode, a Chebyshev neural network is introduced to estimate system uncertainties and external disturbances. An adaptive controller is then proposed. The closed-loop system is guaranteed to be ultimately uniformly bounded. The key feature of this proposed approach is that, by choosing appropriate control gains, it can achieve any given small level ofL2gain disturbanc

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Cruz-Salazar, Bárbara, Lorena Ruiz-Montoya, Ella Vázquez-Domínguez, Darío Navarrete-Gutiérrez, Eduardo E. Espinoza-Medinilla, and Luis-Bernardo Vázquez. "Genetic diversity of Didelphis virginiana related to different levels of disturbance in the Highlands and the Central Depression regions of Chiapas, Mexico." Journal of Tropical Ecology 32, no. 2 (2016): 146–57. http://dx.doi.org/10.1017/s0266467416000080.

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Abstract:The Virginia opossum (Didelphis virginiana) is considered highly adaptable to anthropogenic disturbances; however, the genetic effects of disturbance on this marsupial have not been studied in wild populations in Mexico. Here we evaluated the genetic diversity of D. virginiana at sites with different levels of disturbance within the Highlands and Central Depression regions of Chiapas in southern Mexico. Twelve microsatellite loci were used and the results demonstrated moderate mean heterozygosity (He = 0.60; Ho = 0.50). No significant differences in heterozygosity were found among sit

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Jankowska-Polańska, Beata, Jacek Polański, Krzysztof Dudek, Agnieszka Sławuta, Grzegorz Mazur, and Jacek Gajek. "The Role of Sleep Disturbance, Depression and Anxiety in Frail Patients with AF–Gender Differences." Journal of Clinical Medicine 10, no. 1 (2020): 11. http://dx.doi.org/10.3390/jcm10010011.

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The aim of the study was to assess the link between anxiety and depression and frailty syndrome (FS) in patients with atrial fibrillation (AF) with regard to gender differences. Material and methods. The study was conducted on 158 patients with AF (mean age 70.4 ± 7.6). The study used the hospital anxiety and depression scale (HADS-M), the Athens insomnia scale (AIS) and the Edmonton frailty scale to assess and compare anxiety, depression, and sleep disturbance between frail and non-frail patients with AF. Results. FS was diagnosed in 53.2% of patients. A comparative analysis showed a statisti

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Russell, Matthew, Stephanie Patton, David Wilson, Grant Domke, and Katie Frerker. "Impacts of Alternative Harvesting and Natural Disturbance Scenarios on Forest Biomass in the Superior National Forest, USA." Forests 9, no. 8 (2018): 491. http://dx.doi.org/10.3390/f9080491.

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The amount of biomass stored in forest ecosystems is a result of past natural disturbances, forest management activities, and current structure and composition such as age class distributions. Although natural disturbances are projected to increase in their frequency and severity on a global scale in the future, forest management and timber harvesting decisions continue to be made at local scales, e.g., the ownership or stand level. This study simulated potential changes in natural disturbance regimes and their interaction with timber harvest goals across the Superior National Forest (SNF) in

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Sunarya, Adhitya Sumardi, Fitria Suryatini, Nuryanti Nuryanti, Abdur Rohman Harist M, and Gailan Anaisabury. "Feedforward–Feedback Fuzzy-PID Water Level Control using PLC and Node-RED IoT." Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) 7, no. 2 (2025): 177. https://doi.org/10.28989/avitec.v7i2.3066.

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Water level control is vital in industrial processes to maintain operational stability and efficiency, especially against varying disturbances like changes in water inflow and outflow. This research proposes a combined feedforward–feedback control system using a Fuzzy-PID algorithm implemented on an Omron CP1H PLC, integrated with an IoT-based Node-RED monitoring interface. The system is designed to improve response accuracy and disturbance recovery in water level control applications. An experimental method was used to evaluate the performance of the proposed control system against convention

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Zhao, Dehai, Bruce Allen, and Rebecca R. Sharitz. "Twelve year response of old-growth southeastern bottomland hardwood forests to disturbance from Hurricane Hugo." Canadian Journal of Forest Research 36, no. 12 (2006): 3136–47. http://dx.doi.org/10.1139/x06-204.

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The influence of wind damage from Hurricane Hugo on bottomland forest community structure and composition over a 12 year period was evaluated using data generated from repeated measurements in permanent plots. The resistance and responsiveness of the forests to hurricane disturbance at the community level are dependent on the prehurricane species composition and structure. However, there is no evidence to support the hypothesis that forests with higher species diversity are more resistant to hurricane disturbances. The hurricane disturbance does restructure species composition and may enrich s

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Mikhailov, A. V., A. H. Depueva, and V. H. Depuev. "Daytime F2-layer negative storm effect: what is the difference between storm-induced and Q-disturbance events?" Annales Geophysicae 25, no. 7 (2007): 1531–41. http://dx.doi.org/10.5194/angeo-25-1531-2007.

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Abstract. Negative F2-layer storms related to geomagnetic activity and quiet-time disturbances (Q-disturbances) belong to different classes of events and exhibit different morphology. Mid-latitude daytime Q-disturbances, unlike the usual negative F2-layer storms, demonstrate NmF2 and hmF2 in-phase variations. An analysis of Millstone Hill ISR observations for usual and Q-disturbances has shown the difference in the controlling aeronomic parameter variations for the two classes of events. The decrease in atomic oxygen concentration provides the main contribution to the hmF2 decrease below the m

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Wang, Xiaohui, Peng Wang, Yunbo Wang, and Fang Shi. "Online Estimation of Short-Circuit Fault Level in Active Distribution Network." Applied Sciences 10, no. 11 (2020): 3812. http://dx.doi.org/10.3390/app10113812.

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The potential short-circuit current in active distribution network features time-variance with the increasing distributed generations. This feature makes the online estimation of fault level necessary. In this paper, a novel online estimation method is proposed to be implemented by either phasor measurement unit (PMU) or the measurements from protection relays. The equivalent circuit of the radial distribution network with distributed generators (DGs), e.g., wind turbines and photovoltaic cells, is derived with necessary simplifications. The natural disturbances downstream are used to evaluate

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