1,391 research outputs found
A new species of deep-sea squat lobster of the genus Munida Leach, 1820 (Crustacea: Decapoda: Anomura: Munididae) from a hydrothermal field in the southwestern Indian Ocean
No full textLiu, Xinming, Lin, Rongcheng, Huang, Dingyong (2013): A new species of deep-sea squat lobster of the genus Munida Leach, 1820 (Crustacea: Decapoda: Anomura: Munididae) from a hydrothermal field in the southwestern Indian Ocean. Zootaxa 3734 (3): 380-384, DOI: http://dx.doi.org/10.11646/zootaxa.3734.3.
A new squat lobster species of the genus Munida Leach, 1820 (Crustacea: Anomura: Galatheoidea: Munididae) from hydrothermal vents on the Eastern Pacific Rise
No full textLiu, Xinming, Li, Xinzheng, Lin, Rongcheng (2020): A new squat lobster species of the genus Munida Leach, 1820 (Crustacea: Anomura: Galatheoidea: Munididae) from hydrothermal vents on the Eastern Pacific Rise. Zootaxa 4743 (1): 131-136, DOI: https://doi.org/10.11646/zootaxa.4743.1.1
Three new species of Phyllomyza Fallén (Diptera: Milichiidae) from Yintiaoling National Nature Reserve of Chongqing, with an updated key from China
No full textXi, Yuqiang, Zhu, Yongqiang, Liu, Chang, Yang, Ding, Yin, Xinming (2023): Three new species of Phyllomyza Fallén (Diptera: Milichiidae) from Yintiaoling National Nature Reserve of Chongqing, with an updated key from China. Zootaxa 5257 (1): 115-122, DOI: 10.11646/zootaxa.5257.1.8, URL: http://dx.doi.org/10.11646/zootaxa.5257.1.
FIGURES 1–6 in Three new species of Phyllomyza Fallén (Diptera: Milichiidae) from Yintiaoling National Nature Reserve of Chongqing, with an updated key from China
No full textFIGURES 1–6. Head (male, lateral view) and wing (male). 1–2, Phyllomyza fuscusagenis sp. nov.; 3–4, Phyllomyza hirtipes sp. nov.; 5–6, Phyllomyza obtusus sp. nov. Scale bars = 0.1 mm.Published as part of Xi, Yuqiang, Zhu, Yongqiang, Liu, Chang, Yang, Ding & Yin, Xinming, 2023, Three new species of Phyllomyza Fallén (Diptera: Milichiidae) from Yintiaoling National Nature Reserve of Chongqing, with an updated key from China, pp. 115-122 in Zootaxa 5257 (1) on page 119, DOI: 10.11646/zootaxa.5257.1.8, http://zenodo.org/record/776592
FIGURE 2 in A new species of deep-sea squat lobster of the genus Munida Leach, 1820 (Crustacea: Decapoda: Anomura: Munididae) from a hydrothermal field in the southwestern Indian Ocean
No full textFIGURE 2. Munida manqingae sp. nov., holotype, ♀ (CL 6.9 mm): A, left P2, dorsal view; B, left P3, dorsal view; C, left P4, dorsal view; D, left P5, dorsal view (setae omitted); E, merus of right P1, ventral view; F, merus of right P1, dorsal view; G, merus of right P1, mesial view; H, merus of right P1, lateral view;; I, merus of right P2, dorsal view; J, dactylus of left P2, lateral view. Scale bar: A–D, 2.5 mm; E–I, 2mm; J, 1.2 mm.Published as part of Liu, Xinming, Lin, Rongcheng & Huang, Dingyong, 2013, A new species of deep-sea squat lobster of the genus Munida Leach, 1820 (Crustacea: Decapoda: Anomura: Munididae) from a hydrothermal field in the southwestern Indian Ocean, pp. 380-384 in Zootaxa 3734 (3) on page 383, DOI: 10.11646/zootaxa.3734.3.7, http://zenodo.org/record/527570
FIGURES 7–12 in Three new species of Phyllomyza Fallén (Diptera: Milichiidae) from Yintiaoling National Nature Reserve of Chongqing, with an updated key from China
No full textFIGURES 7–12. Male epandrium, cercus, and surstylus, posterior view and lateral view. 7, Phyllomyza fuscusagenis sp. nov., posterior view; 8, Phyllomyza fuscusagenis sp. nov., lateral view; 9, Phyllomyza hirtipes sp. nov., posterior view; 10, Phyllomyza hirtipes sp. nov., lateral view; 11, Phyllomyza obtusus sp. nov., posterior view; 12, Phyllomyza obtusus sp. nov., lateral view. Scale bars = 0.1 mm.Published as part of Xi, Yuqiang, Zhu, Yongqiang, Liu, Chang, Yang, Ding & Yin, Xinming, 2023, Three new species of Phyllomyza Fallén (Diptera: Milichiidae) from Yintiaoling National Nature Reserve of Chongqing, with an updated key from China, pp. 115-122 in Zootaxa 5257 (1) on page 120, DOI: 10.11646/zootaxa.5257.1.8, http://zenodo.org/record/776592
Prescribed Vibration Control for Long Slender Remote Systems in Nuclear Decommissioning
No full textIn nuclear decommissioning and other hazardous environments, long slender remote manipulators are crucial for performing tasks where human intervention is not possible. However, their inherent flexibility poses critical challenges such as deformation and vibration, which can degrade control precision and induce risks in rapid operations. To address such issues, this paper presents a new vibration suppression control strategy for a specialised type of flexible manipulators. A two-link model, featuring a fixed, flexible first link and a rigid second link, is considered to capture the core effects of one typical kind of long-reach remote systems, which consist of a relatively rigid manipulator supported by a long slender structure. The system dynamics are modelled using the assumed mode method, and a prescribed vibration control (PVC) framework is developed, integrating two prescribed vibration control barrier functions (PV-CBFs) and a finite-time disturbance observer to manage unmodelled uncertainties and external disturbances. This framework ensures predefined vibration performance and accurate end-point positioning by formulating a quadratic programming (QP) problem that adjusts a baseline tracking controller. The proposed method is validated through rigorous theoretical analysis and simulation tests, demonstrating better tracking performance compared to traditional methods
Developing a web-based cellular automata model for urban growth simulation
Get PDFCellular automata as an emerging technology have been adapted increasingly by geographers and planners to simulate the spatial and temporal processes of urban growth. While the literature reports many applications of cellular automata models for urban studies, in practice, the operation of the models as well as the configuration and calibration of relevant parameters used in the models were only known to the model builders. This is largely due to the constraint that most cellular automata models were developed based on desktop computer programs, either by incorporating the model within a desktop GIS environment, or developing the model independent of a desktop GIS. Consequently, there is little input from the user to test or visualise the actual operation or evaluate the applicability of the model under different conditions. This paper presents a methodology to implement a fuzzy constrained cellular automata model of urban growth within a web-based GIS environment, using the actual urban growth of Metropolitan Sydney, Australia from 1976 to 2006 as a case study. With the web-based cellular automata model, users can visualise and test the operation of the model; they can also modify or calibrate the model's parameters to evaluate its simulation accuracies, or even feed the model with various 'what-if' conditions to generate alterative outcomes. Such a web-based modelling platform provides a useful and effective channel for government authority and stakeholders to evaluate different urban growth scenarios. It also provides an interactive environment that can foster public participation in urban planning and management
Phyllomyza fuscusagenis Xi & Zhu & Liu & Yang & Yin 2023, sp. nov.
No full textPhyllomyza fuscusagenis sp. nov. (Figs 1, 2, 7, 8) Diagnosis. Gena narrow, approximately one-tenth of eye height. Surstylus with upper blade of bifurcated tip extremely swollen, with apical margin blunt, the lower one thin and longer than upper one. Description. Male. Body length 1.4–1.6 mm; wing length 1.4–1.6 mm. Head brown with greyish microtomentum; orbital plate darkish brown with microtomentum, ocellar triangle darkish brown without microtomentum; lunule strap-shaped, brown with black margin. Posterior eye margin ventrally diverging from head margin; eye 1.5 times as high as long, gena approximately one-tenth of eye height. Setae and setulae on head black; ocellar triangle with 2 ocellar setae and 3 short setae; frons with 3 orbital and 2 frontal setae on brown orbital stripe, orbital setae lateroclinate and frontal setae medioclinate, 4 interfrontal setae; postocellar setae cruciate. Lunule with 2 setae. Vibrissal angle relatively blunt; vibrissa strong, located below the level of lower eye margin. Antenna brown with microtomentum; pedicel with short black setulae at middle and margin, setulae at margin longer than others, the longest one about 2.5 times longer than others; first flagellomere with pubescence, irregularly quadrate; arista 3 times as long as first flagellomere, black, distinctly pubescent. Proboscis slightly short and fold, darkish brown, with sparse setulae. Palpus short, with blunt tip in lateral view, about 0.4 mm, 3.5 times longer than wide; darkish brown with short dense black pubescence, margins with sparse setulae. Thorax brownish with grey microtomentum except mesonotum shiny brownish with sparse black microtomentum; scutellum brownish with grey microtomentum. Setae and setulae on thorax black; 1 h, 2 dc, 1 prsc, 2 npl, 1 prs, 1 pos, 1 sa, 2 pa, 1 kepsts (a row of setulae at forward position); scutellum 1.5 times wider than long, with pair of asc and bsc, asc 3 times longer than bsc. Legs slender, coxae and femora darkish brown, tibiae yellow except hind tibiae brown with yellow apically, tarsi yellowish. Setae and setulae on legs black. Mid tibia with 1 black preapical dorsal seta. Wing hyaline, veins brown; M 1 between r-m and dm-cu a little longer than dm-cu. Calypter yellowish, with dense blackish microtrichae, margin with thin and long setulae. Knob of halter brownish, stalk brownish. Abdomen brown with grey microtomentum. Setae and setulae on abdomen black; T2-T5 with setae, marginal setae longer than others; sternites with sparse setulae at posterior 3/4. Posteromedial triangular projection of T1 into T2 strong; S2 irregularly horseshoe-shaped and apex blunt and round, S3 generally trapezoid, apical margin slightly wider than basal margin, S4 horizontal rectangular, basal margin smooth, S5 horizontal trapezoid, apical margin flat. Male genitalia: epandrium with 7 strong black setae; surstylus with upper blade of bifurcated tip extremely swollen, with apical margin blunt, the lower one thin and longer than upper one; cercus arched with longer ventral appendix, with short sparse setae. Female. Unknown. Type material. HOLOTYPE male, CHINA, Chongqing, Yintiaoling Nature Reserve, Mt. Guanshan, Maizitang, 2168 m, 31°28′N 109°47′E, 2022. VIII. 17, Xulong Chen. PARATYPES: 2 males, Yintiaoling Nature Reserve, Lanying Grand Canyon, 875 m, 31°26′N 109°50′E, 2022. VIII. 13, Xulong Chen. Distribution. China (Chongqing) Etymology. The specific epithet refers to the colour of gena. Remarks. This new species is distinctly different from other species of this genus in the hind tibia brown with yellow apex; the relatively longer palpus.Published as part of Xi, Yuqiang, Zhu, Yongqiang, Liu, Chang, Yang, Ding & Yin, Xinming, 2023, Three new species of Phyllomyza Fallén (Diptera: Milichiidae) from Yintiaoling National Nature Reserve of Chongqing, with an updated key from China, pp. 115-122 in Zootaxa 5257 (1) on pages 117-118, DOI: 10.11646/zootaxa.5257.1.8, http://zenodo.org/record/776592
Annual methane uptake from different land uses in an agro-pastoral ecotone of northern China
No full textThe semi-arid grasslands in northern China are subjected to accelerating land use change due to population growth and food demand. Considerable uncertainty exists on annual methane (CH4) fluxes of different land uses because most measurements have only been conducted during the growing season. Using static chamber - gas chromatographic technique, we quantified and characterized annual CH4 fluxes (from 2012 to 2015) from four land uses common in an agro-pastoral ecotone of northern China: summer-grazed grassland (SumGrazed), winter-grazed grassland (WinGrazed), ungrazed grassland since 1997 (Ungrazed) and oat cropland (OatCrop). The soil at all land uses functioned exclusively as a sink for atmospheric CH4 through the entire three years. Annual CH4 uptake rates averaged 1.42, 2.36,1.12 and 2.57 kg C ha(-1) yr(-1) for SumGrazed, WinGrazed, Ungrazed and OatCrop, respectively, during 2012-2015. Compared to Ungrazed, OatCrop and WinGrazed increased annual CH4 uptake by 129 and 111%, respectively. Non-growing season (October-April) contributed 28-43% of the annual CH4 uptake at all land uses. Across all four land uses, annual cumulative CH4 uptake decreased with increasing soil water-filled pore space (WFPS) explaining 81% of the variance in annual CH4 uptake. WFPS negatively correlated to CH4 uptake in the growing season (R-2 =0.16-0.35, P < 0.001). CH4 uptake increased with soil temperature through the entire observed period (R-2 = 0.38-0.63, P < 0.001) and the non-growing season (R-2 = 0.51-0.74, P < 0.001). We conclude that grazing has the potential to increase CH4 uptake from the atmosphere and consequently, contribute positively to CH4 related part of C budget. (C) 2017 Elsevier B.V. All rights reserved
- …
