8,782 research outputs found
Paramorphocoris Bai & Heiss, gen. n.
No full text<i>Paramorphocoris</i> Bai & Heiss, gen. n. <p> Type species: <i>Paramorphocoris henanensis</i> Bai & Heiss, sp.n.</p> <p> <b>Diagnosis.</b> Apterous. Medium sized. Body elongate ovate. Dorsal and ventral surfaces partly covered by grayish incrustation of unique pattern, only lateral borders with few short bristles. Head longer than width across eyes; genae slender, produced over clypeus; antenniferous tubercles stout, conical, apically pointed; eyes small, semiglobose, with convex face; postocular lobes anterolaterally subparallel with some distinct tubercles, converging posteriorly to constricted neck; vertex and clypeus together forming a median ridge; antennae long and slender, first and third segments of subequal length, second shortest, first stout and clavate, second and third cylindrical, fourth fusiform; rostrum arising from a slit-like atrium, not reaching limits of rostral groove. Pronotum attenuated anteriorly, anterolateral angles protruding anteriorly beyond collar, disc with narrow medial groove. Meso- and metanota medially fused to narrow, high longitudinal ridge strongly constricted at middle and flanked by deep depressions, laterally separated by furrows, metanotum separated by furrows from mtg I, mtg II and triangular fused deltg I+II; lateral margins of thoracic segments incrassate, deeply cleft between pro-, meso-, and metanota. Mtg I separated from mtg II by a furrow. Tergal plate of fused mtg III-VI pentagonal. Tergite VII strongly elevated posteriorly (Fig. 2) Thoracic sterna with processes pointing to coxae.</p> <p>Legs long and slender, without spines trochanters fused to femora.</p> <p> <b>Distribution.</b> China.</p> <p> <b>Etymology.</b> The generic name reflects the similarity to <i>Morphocoris,</i> >para<(Latin) = near to.</p> <p> <b>Remarks.</b> General habitus, head and thoracic structures of the new genus resemble those of the Oriental genus <i>Morphocoris</i> Kormilev 1980 (Kormilev 1977(as <i>Glyptomorpha</i>); Heiss 1982), which comprises 3 species from Thailand, Malaysia, and India. Compared with a male paratype of <i>Morphocoros thailandicus</i> in the collection of the co-author (EH) (no female specimen has ever been illustrated), the latter is distinguished from <i>Paramorphocoris henanensis</i> gen. et sp. nov. by a much wider and less constricted median ridge of meso- and metanotum without a longitudinal sulcus, by the very deep oval lateral excavations of metanotum, the deeper median depression of mtg I+II showing 2 longitudinal carinae at its bottom on mtg II, the straight anterior margin of the tergal plate, and the deep median excavation on mtg III in continuation of that of mtg I+II flanked by raised margins. The elevations and deep cavities cannot be recognized from Kormilev’s 1977 only illustration of this species (p.618, Fig. 19).</p>Published as part of <i>Cui, Jianxin, Bai, Xiaoshuan, Heiss, Ernst & Cai, Wanzhi, 2015, A new apterous genus of Carventinae (Hemiptera: Aradidae) from China, pp. 143-146 in Zootaxa 3980 (1)</i> on pages 143-144, DOI: 10.11646/zootaxa.3980.1.9, <a href="http://zenodo.org/record/239185">http://zenodo.org/record/239185</a>
Bai Jie
No full textEl proyecto Bai Jie se compone de dos partes. La teórica profundiza en el recorrido y las posibilidades
del videodanza, desde la perspectiva de muchos y muy diversos casos prácticos. Todo ello desde la
mirada personal del artista y con un profundo respeto por las costumbres, la idiosincrasia y la
autodeterminación de los pueblosCui, H. (2013). Bai Jie. https://riunet.upv.es/handle/10251/35549.Archivo delegad
Qu qiu bai yu cui
No full textQu qiu bai duan zan yi sheng zhong cong shi ge ming shi jian huo dong, ye jin xing da liang de li lun yan jiu he xuan chuan, wen xue chuang zuo he ping lun, ben shu shi cong ta zhu zuo he yi wen zhong ze qu jing cu
Attitude tracking with an adaptive sliding mode response to reaction wheel failure
No full textThis paper proposes an attitude tracking control for a rigid spacecraft that adapts to two types of faults that commonly occur in reaction wheels: a gain fault and a deviation fault. In its normal operating mode the tracking controller replicates that of a continuous quaternion feedback controller. When a fault occurs in the system the attitude of the spacecraft will deviate from the reference trajectory and will consequently trigger a sliding mode response of the control which introduces robustness. For the proposed control law, we construct a suitable Lyapunov function to prove the closed-loop system is asymptotically stable in the presence of such faults. However, the proposed control is not practically suitable over long periods as the gain on the sliding mode component will always increase unless the sliding surface is exactly zero (in practise this is never the case because of sensor noise). To address this problem a simple adaptive parameter is defined such that it converges to an appropriate upper-limit. Simulations of the attitude dynamics of a spacecraft are undertaken which compares the tracking performance in the presence of a fault with and without the adaptive sliding mode component
A singular adaptive attitude control with active disturbance rejection
No full textThis paper develops a quaternion attitude tracking control with an adaptive gains parameter that can be tuned to compensate for disturbances with known bound. The adaptive gain is described by a simple, but singular, differential equation and the corresponding adaptive control is shown to asymptotically track a reference attitude. However, this control requires the bound on the disturbance torque to be known in order to appropriately tune the controller to compensate for it. Using a linear state observer to estimate the disturbance torque and compensating for the disturbance at each sampling period the adaptive control can achieve asymptotic tracking in the presence of an unknown disturbance torque. In this case the error in the estimation, rather than the entire disturbance, is compensated for by the adaptive gain at each sampling period. Simulations demonstrate that an improved tracking performance can be achieved when compared to standard quaternion tracking controls
Cui Yilin
No full textInk drawing depicting Laurent Bai Man 白滿老楞左 arrested in 1856 with Fr. Auguste Chapdelaine and decapitated in Xilin (Guangxi); seal of artist Cui Yilin 崔邑林.https://digitalcommons.whitworth.edu/g33_chinese_art3/1005/thumbnail.jp
Integrated guidance and control for solar sail station-keeping with optical degradation
No full textCurrent control approaches for solar sail station-keeping on libration point orbits have not considered the degradation of the sail's optical properties. However, significant optical degradation could lead to poor station-keeping performance or even complete failure. This paper presents an integrated guidance and control strategy to address this problem by updating the reference orbit based on in situ estimation. An exponential optical degradation model is incorporated into the solar radiation acceleration model, and an on-line reference orbit update approach is incorporated into the station-keeping, coupled with an active disturbance rejection controller. The reflection coefficient is estimated on-line and the reference orbit is updated discretely when the optical properties have degraded by a prescribed amount. This strategy provides discrete updates to the reference orbits such that the perturbation due to the optical degradation is maintained within a small range. These smaller perturbations can be dealt with by the controller's robustness and station-keeping can be sustained for long durations even in the presence of large optical degradation
A new apterous genus of Carventinae (Hemiptera: Aradidae) from China
No full textCui, Jianxin, Bai, Xiaoshuan, Heiss, Ernst, Cai, Wanzhi (2015): A new apterous genus of Carventinae (Hemiptera: Aradidae) from China. Zootaxa 3980 (1): 143-146, DOI: 10.11646/zootaxa.3980.1.
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