27,019 research outputs found
[{HC(CMeNAr)(2)}(2)Al2P4] (Ar=2,6-iPr(2)C(6)H(3)): A reduction to a formal {P-4},4(-) charged species
No full textNon-fragile H infinity control for switched stochastic delay systems with application to water quality process
No full textArticle first published online: 14 JAN 2013
Link to a related website: https://re.public.polimi.it/bitstream/11311/1028692/2/Non-fragile%20H%20control%20for%20switched%20stochastic%20delay%20systems_11311-1028692_Wang.pdf, Open Access via UnpaywallIn this paper, the problem of non-fragile observer-based H ∞ control for discrete-time switched delay systems is investigated. Both data missing and time delays are taken into account in the links from sensors to observers and from controllers to actuators. Because data missing satisfies the Bernoulli distribution, such problem is transformed into an H ∞ control problem for stochastic switched delay systems. Average dwell time approach is used to obtain sufficient conditions on the solvability of such problems. A numerical example and a real example for water quality control are provided to illustrate the effectiveness and potential applications of the proposed techniques.Dong Wang, Peng Shi, Wei Wang and Hamid R. Karim
Hamataliwa cucullata Tang & Wang & Peng 2012, sp. nov.
No full textHamataliwa cucullata sp. nov. Figs 1–15 Type material (CHINA: Yunnan, Tengchong County). Holotype ♂, Mingguang Town, Zizhi Village, Cizhuhe River bank (N25º76.661', E98º61.739', 2120 m), 21 May 2006, C.M. Yin and J.F. Hu leg. (HNU _ YHY09). Paratypes: 1 ♂, 3 ♀, same data as holotype (HNU _ YHY09); 1 ♂, 3 ♀, Jietou Town, Datang Village, Daheling, Ganjiao (N25º42.018', E98º40.946', 1878 m), 19 May 2006, X.J. Peng, X.P. Wang and P. Hu leg. (CAS _ Peng 060519); 1 ♀, Jietou Town, Datang Village, Daheling, Ganjiao (N25º74.556', E98º69.630', 2030 m), 15 May 2006, X.J. Peng, X.P. Wang and P. Hu leg. (HNU _ Peng 060515); 1 ♀, Jietou Town, Datang Village, Daheling, Ganjiao (N25º63.327', E98º67.035', 1779 m), 18 May 2006, X.J. Peng, X.P. Wang and P. Hu leg. (HNU _ Peng 060518); 1 ♂, Jietou Town, Datang Village, Longtang, Hemuguayuan (N25º75.720', E98º69.459', 2078 m), 16 May 2006, X.J. Peng, X.P. Wang and P. Hu leg. (CAS _ Peng 060516); 1 ♀, Jietou Town, Datang Village, Dahetou, Lingganjiao (N25º73.947', E98º69.630', 2010 m), 14–15 May 2006, D.H. Kavanaugh and R.L. Brett leg. (CAS _DHK-2006-021B). Etymology. The specific name is an adjective from the Latin word cucullata (hood-shaped), and refers to the large hood-shaped conductor of the male palp. Diagnosis. The females of Hamataliwa cucullata sp. nov. and H. torsiva sp. nov. can be separated from all other congeneric species by the covering of the copulatory opening, which is covered with a raised sclerite. The female of this new species H. cucullata can be easily distinguished from H. torsiva sp. nov. by (compare Figs 8, 10, 14 with Figs 19, 21, 23) the larger epigynal depression, the presence of a small hood on the epigynum (absent in H. torsiva sp. nov.) and the absence of a posteriorly sclerotized rim on the epigynum (present in H. torsiva sp. nov.). The male of this new species can be separated from all other congeneric species (e.g. H. foveata Tang & Li, 2012, H. pilulifera Tang & Li, 2012) by the long digitiform VTA and the large, hood-shaped conductor (see Figs 4–6, 12–13). Description. Male (holotype measured): Total length 4.00. Prosoma 1.70 long, 1.45 wide; opisthosoma 2.10 long, 1.30 wide. Carapace grayish brown with grayish white scales. Ocular area black with light gray scales. Eye measurements: AME 0.08; ALE 0.18; PME 0.13; PLE 0.14; AME-AME 0.08; AME-ALE 0.06; PME-PME 0.22; PME-PLE 0.22. Eye row width measurement: I 0.21, II 0.46, III 0.78, IV 0.45. Clypeus height 0.28. Sternum light brown, margin dark gray; chelicera and endites yellowish brown, labium dark gray, chelicera with two promarginal (one large, one small) and one small retromarginal tooth (Fig. 3). Legs light grayish brown with long spines. Leg measurements: I 6.20 (1.80, 2.10, 1.50, 0.80); II 5.90 (1.70, 2.00, 1.40, 0.80); III 4.10 (1.20, 1.30, 1.00, 0.60); IV 4.20 (1.20, 1.40, 1.00, 0.60), leg formula: 1243. Opisthosoma elongated oval, dorsally dark gray with grayish white scales; ventrally gray with longitudinal dark gray markings. Palp (Figs 4–6, 12–13). VTA long digitiform, RTA wider basally, the distal portion beak-shaped in retrolateral view; conductor conspicuous, large-hood-shaped, median apophysis digitiform in lateral view, the distal end of embolus covered by the conductor. Female (one paratype, same data as holotype (HNU_YHY09)): Total length 4.50. Prosoma 1.80 long, 1.50 wide; opisthosoma 2.50 long, 1.80 wide. Carapace dark brown with grayish brown scales. Eye measurements: AME 0.08; ALE 0.18; PME 0.14; PLE 0.14; AME-AME 0.10; AME-ALE 0.05; PME-PME 0.26; PME-PLE 0.24. Eye row width measurement: I 0.25, II 0.52, III 0.88, IV 0.50. Clypeus height 0.32. Chelicera with 2 pro- (one large, one small) and one large retromarginal tooth. Legs dark brown with long spines. Leg measurements: I 6.15 (1.90, 2.20, 1.30, 0.75); II 5.70 (1.70, 2.10, 1.20, 0.70); III 4.65 (1.40, 1.70, 1.00, 0.55); IV 4.50 (1.50, 1.50, 1.00, 0.50), leg formula: 1234. Opisthosoma dorsally brown with blackish brown stripes; ventrally yellow with longitudinal gray markings. Epigynum (Figs 8–11, 14–15). Epigynun with a large central depression, posteriorly with a pair of sclerites covered the copulatory openings. Between the sclerites is a small hood, which can be observed clearly from slightly different angles. Copulatory ducts transparent, twisted; spermathecae globular; fertilisation ducts visible. Variation. Male total length from 4.00–4.80 (n=4), female total length from 3.60–4.00 (n=9). Distribution. China (Yunnan).Published as part of Tang, Guo, Wang, Qiaobing & Peng, Xianjin, 2012, Two new species of the genus Hamataliwa Keyserling, 1887 (Araneae: Oxyopidae) from Gaoligong Mountains, Yunnan, China, pp. 63-70 in Zootaxa 3544 on page 6
<i>Begonia quinquealata</i> C.I Peng, Rubite & C.W.Lin.
No full textA, habitat; B, habit; C, stipules on rhizome; D, inflorescence with staminate flower; E, F, staminate flower, face and side views; G, H, capsule, viewed from side and bottom. All from Peng 24588.</p
Search for new hadronic decays of h c and observation of h c → p p ¯ η
No full textAbstract A search for the hadronic decays of the h c meson to the final states p p ¯ π + π − π 0, p p ¯ η , and p p ¯ π 0 via the process ψ(3686) → π 0 h c is performed using (4.48 ± 0.03) × 108 ψ(3686) events collected with the BESIII detector. The decay channel h c → p p ¯ η is observed for the first time with a significance greater than 5σ and a branching fraction of (6.41 ± 1.74 ± 0.53 ± 1.00) × 10 −4, where the uncertainties are statistical, systematic, and that from the branching fraction of ψ(3686) → π 0 h c . Strong evidence for the decay h c → p p ¯ π + π − π 0 is found with a significance of 4.9σ and a branching fraction of (3.84 ± 0.83 ± 0.69 ± 0.58) × 10 −3. The significances include systematic uncertainties. No clear signal of the decay h c → p p ¯ π 0 is found, and an upper limit of 6.59 × 10 −4 on its branching fraction is set at the 90% confidence level
Effect of sol types on the mechanical properties of 3D printed silica ceramics
No full textSilica ceramic cores are widely used in the manufacturing of hollow blades for aircraft engines due to the excellent mechanical and chemical properties. 3D printed silica ceramics often face the problem of low flexural strength at the application temperature of 1250 degrees C, and the simultaneous requirements for both adequate porosity and strength limit their manufacturing process. This study utilized three different impregnation solutions to analyze the effects of sol types on the microstructure and flexural strength of 3D printed silica ceramics. The results indicate that after impregnation with silica sol (SS), alumina sol (AS), and zirconia sol (ZS), the flexural strength of the 3D printed ceramics all improved effectively. SEM showed that the SiO2 ceramic cores impregnated with the AS solution did not produce cracks, possessed a more uniform microstructure, a lower surface roughness and exhibited the best overall performance, with an open porosity of 24.21 +/- 0.11 vol%, bulk density of 1.71 +/- 0.01 g/cm3, and a flexural strength of 24.35 +/- 0.11 MPa
Robust H∞ filtering for networked control systems with markovian jumps and packet dropouts
No full textThis paper deals with the H-Infinity filtering problem for uncertain networked control systems. In the study, network-induced delays, limited communication capacity due to signal quantization and packet dropout are all taken into consideration. The finite distributed delays with probability of occurrence in a random way is introduced in the network.The packet dropout is described by a Bernoulli process. The system is modeled as Markovian jumps system with partially known transition probabilities. A full-order filter is designed to estimate the system state. By linear inequality approach, a sufficient condition is derived for the resulting filtering error system to be mean square stable with a prescribed H-Infinity performance level. Finally, a numerical example is given to illustrate the effectiveness and efficiency of the proposed design method.Fangwen Li, Peng Shi, Xingcheng Wang, Hamid Reza Karim
<i>Begonia elnidoensis</i> C.I Peng, Rubite & C.W.Lin.
No full textA, habit; B, stipule; C, C', portion of leaf, upper and lower surface; D, D', bracts at lowermost and uppermost parts of inflorescence; E, E', staminate flower, face and side views; F, F', stamen, dorsal and ventral views; G, G', pistillate flower, face and side views; H, H', H'', style and stigmatic band, dorsal, side and ventral views; I, cross section of an immature capsule; J, capsule. All from Peng 23508.</p
<i>Begonia gironellae</i> C.I Peng, Rubite & C.W.Lin.
No full textA, habit; B, rhizome, showing stipules and fleshy hairs at petiole base; C, stipule; D, D', bracts at lowermost and uppermost parts of inflorescence; E, E', staminate flower, face and side views; F, F', F'', stamen, dorsal, side and ventral views; G, G', pistillate flower, face and side views; H, H', H'', style and stigmatic band, side, dorsal and ventral views; I, I', capsules; J, J', serial cross section of an ovary. All from Peng 24579.</p
<i>Begonia gironellae</i> C.I Peng, Rubite & C.W.Lin.
No full textA, habitat; B, rhizome showing petiole base; C, inflorescence, showing staminate and pistillate flowers; D, portion of leaf, showing velutinous margin; E, bracts on an immature inflorescence; F, staminate flowers; G, pistillate flowers; H, mature capsules; I, J, serial cross section of an ovary. All from Peng 24579.</p
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