18,493 research outputs found
Analyse des signaux multicomposante à modulation de fréquence linéaire par la transformation de Teager-Huang-Hough
Full text linkA novel detection approach of linear FM (LFM) signals, with single or multiple components, in the time-frequency plane of Teager-Huang (TH) transform is presented. The detection scheme that combines TH transform and Hough transform is referred to as Teager-Huang-Hough (THH) transform. The input signal is mapped into the time-frequency plane by using TH transform followed by the application of Hough transform to recognize time-frequency components. LFM components are detected and their parameters are estimated from peaks and their locations in the Hough space. Advantages of THH transform over Hough transform of Wigner-Ville distribution (WVD) are: 1) cross-terms free detection and estimation, and 2) good time and frequency resolutions. No assumptions are made about the number of components of the LFM signals and their models. THH transform is illustrated on multicomponent LFM signals in free and noisy environments and the results compared with WVD-Hough and pseudo-WVD-Hough transforms
Rede uitgesproken op 17 september 1956 ter gelegenheid van de erepromotie van Dr. Th. von Karman door de promotor Dr. C.B. Biezeno
No full textRede uitgesproken door prof. C.B. Biezeno ter gelegenheid van de erepromotie aan de TH Delft van dr. Theodore von Karman.Precision and Microsystems EngineeringMechanical, Maritime and Materials Engineerin
Xiangxius Tian & X. Huang 2021, n. gen.
No full textXiangxius Tian & X. Huang, n. gen. Type species: Xiangxius jiangi Tian & Huang, n. sp. (the cave Tangle Dong, Jishou, Hunan). Generic characteristics. Medium-sized for cavernicolous trechine beetles, aphaenopsian and depigmented; body elongate, with thin and slender appendages. Head strongly elongate; genae slightly expanded at sides; two pairs of supra-orbital setiferous pores present; frontal furrows short and reduced, ending just behind the level of anterior supraorbital pores; vertex strongly convex; right mandibular tooth bidentate; labial suture completely disappeared; mentum densely pubescent at base of tooth apart from presence of two long setae, base largely and deeply concave; submentum with a row of 15–16 setae; antennae thin and long, but not extending over apices of elytra. Propleura visible from above; pronotum cylindrical, distinctly elongated, lateral margins nearly parallel-sided, presence of two pairs of latero-marginal setae (two additional setae present near the anterior seta on each side in the holotype specimen), both of fore and hind angles obtuse. Elytra elongated ovate, with a distinct humeral angle on each side; slightly longer than fore body including mandibles; lateral margins smooth, well-bordered throughout; disc strongly convex, striae noticeable though very weak, almost obsolete; two pairs of dorsal setiferous pores present on the 3 rd stria, preapical pores absent; the humeral group of the marginal umbilicate pores not aggregated, 1 st pore inwardly and backwardly shifted, 5 th and 6 th pores widely spaced. Only 1 st protarsomere modified in male, which is widened and distinctly denticulate inwardly at apex. Ventrite VII with one pair of apical setae in male, whereas two pairs in female. Male genitalia quite short but elongated, moderately sclerotized, blunt at apex. Remarks. Xiangxius has the following peculiar characters: the protruding humeral angles on elytra; pubescent mentum; multisetose submentum; narrower pronotum which is as wide as head; and the peculiar elytral chaetotaxy: dorsal and marginal umbilicate pores are large and extraordinarily marked, 1 st pore of the marginal umbilicate series inwardly and backwardly shifted on 6 th striae and at a level behind 3 rd pore, and the 5 th and 6 th pores of the middle group widely spaced, making the distance from 6 th pore to 5 th as long as to 7 th. The character of protruding hemeral angles on elytra is unique among Chinese cave trechines. We hope phylogenetic analysis based on morphological and molecular data would be helpful to determine its position within subterranean trechines in near future. Etymology. “ Xiangxi ”+ “- us ”. Xiangxi means western Hunan in Chinese. To refer to the homeland of this new genus. Gender masculine. Generic range. China (Hunan) (Fig. 1).Published as part of Tian, Mingyi, Huang, Xinglong & Li, Chenliang, 2021, Contribution to the knowledge of subterranean ground beetles from eastern Wuling Mountains, China (Coleoptera: Carabidae: Trechinae), pp. 521-534 in Zootaxa 4926 (4) on page 522, DOI: 10.11646/zootaxa.4926.4.3, http://zenodo.org/record/452962
Deuveaphaenops (Furongius) huangheae Tian & Huang & Jia 2023, n. sp.
No full textDeuveaphaenops (Furongius) huangheae n. sp. Figures 1b, 32–34 Material. Holotype female, Shisanya Dong, Jinming, Sanqiao, Daozhen, northern Guizhou, 2022-IV-12, leg. Huanghe Zhou, in SCAU. Diagnosis. Small-sized for cave trechine, semi-aphaenopsian, wholly pubescent, Description. Length: 4.5 mm; width: 1.4 mm. Habitus as in Figure 32. Body elongate, sparsely and shortly pubescent, propleura and prosternum glabrous, abdominal ventrites and legs covered with dense and long pubescence; whole body brown, but mouthparts, palps, antennomeres and tarsi pale yellow. Microsculptural engraved meshes moderately transverse on head, strongly transverse on pronotum and elytra. Fore body shorter than elytra, (HLm+PnL)/EL = 1.09. Head much longer than wide, HLm/HW = 2.24, HLl/HW = 1.69, longer than pronotum, HLm/PnL = 1.65, HLl/ PnL = 1.23, narrower than prothorax and pronotum, HW/PrW = 0.84, HW/PnW = 0.88; widest at middle of head from labrum, genae feebly expanded; frons and vertex moderately convex, frontal furrows deep, divergent and reduced posteriad; anterior and posterior frontal setiferous pores located at about middle and basal 1/4 of head; clypeus transverse, 6-setose; labrum transverse, frontal margin shallowly bisinuate, 6-setose; mandibles fairly developed, feebly incurved at apical half, right mandibular tooth tridentate; labial suture completely disappeared; palps slender and subcylindrical, the 3 rd maxillary palpomere slightly shorter (0.91 times) than 4 th, 2 nd labial palpomere slightly longer (1.10 times) than 3 rd; palps glabrous except the 2 nd labial palpomere bisetose on inner margin and with two additional setae on outer margin at middle and subapical part respectively; labial suture disappeared; mentum bisetose, tooth thin, bifid at tip, basal largely foveate; submentum 6-setose; antennae slender, extending at about apical 1/3 of elytra; scape stoutest and shortest, the 5 th longest; the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.33) / 3 rd (1.76) / 4 th (1.78) / 5 th (1.86) / 6 th (1.76) / 7 th (1.62) / 8 th (1.43) / 9 th (1.43) / 10 th (1.29) / 11 th (1.80). Prothorax slightly longer than wide, PrL/PrW = 1.12, propleura feebly convex and visible from above, wider than head, almost as wide as pronotum, PrW/PnW = 1.02, widest at about middle. Pronotum longer than wide, PnL/PnW = 1.13, much narrower than elytra, PW/EW = 0.45; disc moderately convex; fore latero-marginal setae at about 1/8 of pronotum from front, hind latero-marginal setae absent; widest at about 1/4 from front; base narrower than front, PWb/PWf = 0.85. Scutellum small. Elytra elongated, much longer than wide, EL/EW = 1.67; lateral margins subserrate near shoulders, and ciliate throughout; disc moderately convex; striae deep and well-marked; apical striole present; chaetotaxy (Figure 34): similar in Deuveaphaenops (Furongius) gelaophilus Tian & Huang, 2017; basal pores present; anterior and posterior setiferous dorsal pores on the 3 rd stria located at about basal 1/5 and a little behind middle of elytra respectively, preapical pore at about apical 1/5 of elytra, closer to suture than to apical margin of elytra; marginal umbilicate pores not aggregated; the 4 th pore widely separated from 3 rd; the anguloapical pore present. Legs moderately slender; tibiae without longitudinal sulcus; the 1 st tarsomere slightly shorter than, as long as and longer than the 2 nd− 4 th combined in fore, middle and hind legs, respectively. Male: Unknown. Remarks. Deuveaphaenops (Furongius) huangheae n. sp. is the second species of the subgenus Furongius Tian & Huang, 2017 (Huang et al. 2017). It is very similar to Deuveaphaenops (Furongius) gelaophilus Tian & Huang, 2017, but its head is stouter and a little more expanded, submentum 6-setose, instead of 8-setose in D. (F.) gelaophilus; strial punctures of elytra well-marked, whereas not clear D. (F.) gelaophilus; and the 4 th marginal umbilicate pore less backwardly shifted than in D. (F.) gelaophilus (Figure 33). Etymology. Dedicated to Ms. Huanghe Zhou (a very active member of Guilin Cave Exploration Team, Guilin), who discovered and collected the type specimen. Distribution. China (northern Guizhou Province) (Figure 1a). Known only from the cave Shisanya Dong in Daozhen Xian, Zunyi Shi. This cave was unexpectedly discovered during construction of tunnels for building a new road in early 2022. It is about 22 kilometres from Xianmi Dong, the locality of D. (F.) gelaophilus, in straight distance. It still has no natural entrance and its length remains unknown, but at least 5 kilometres regarding to the part across two tunnels (Huanghe Zhou, personal communication). There are several chambers and many beautiful stalactites inside the cave. Two beetle individuals were found running on floor in a wet place, about 200 metres from the nearer tunnel. Unfortunately, only one beetle was successfully collected (Figure 34). Genus Shilinotrechus Uéno, 2003Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 50-54, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/764240
Prof. Th. W. Adorno and the author Hans Erich Nossack.
No full textProf. Th. W. Adorno and the author Hans Erich Nossack at a reception of Insel Verlag, Buchmesse Frankfurt 1966LB
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
Full text linkThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
Leuconemacris xinlongensis Mao & Huang 2023, sp. nov.
No full textLeuconemacris xinlongensis, sp. nov. (Figs 11–15, 30–31) Description. Male. Small size. Head. Head longer, 1.10 times as long as pronotum; frons slightly oblique in lateral view; fastigium triangular, apex acutely angular, dorsum weakly depressed with distinct median and lateral carinae, median carina continuing to half of occiput; vertex between eyes 1.6–1.7 times as wide as frontal costa between antennae; frontal costa broad and flat but finely depressed around median ocellus, lateral margins parallel but weakly contracted near median ocellus. Antennae short and thick, 20 segments, not reaching hind margin of pronotum, median segment (9 th –13 th) mean 0.8 times as long as wide. Eyes roundly triangular, longitudinal diameter 1.1 times horizontal one and 1.0–1.1 times the length of subocular furrow. Thorax. Pronotum with anteral margin straight, posteral margin with a small median notch; median and lateral carinae distinct, lateral carinae a little recurved medially; prozona 1.4 times as long as metazona. Mesosternal interspace trapezoidal, minimum width 2.1 times larger than length; metasternal lobes separate. Tegmen abbreviated, 2.3 times as long as wide, touching each other in mid dorsal line, apex rounded, not reaching or just reaching half of hind femur, or surpassing hind margin of the 7 th abdominal tergite; anterior margin sinuate, precostal area ending at 1/3 of whole length; costal area 1.6–1.7 times as wide as subcostal area, medial area weakly wider than or equal to radial area. Hind wing vestigial, not surpassing half of 1 st abdominal tergite. Hind femur 3.7 times longer than wide, inner side with 48–53 conical stridulatory pegs. Hind tibia with 11 spines on both dorsal margins, outer apical spine absent. Abdomen. Tympanum developed. 10 th abdominal tergite partially excised in middle, furculae faint. Epiproct triangular, as long as wide, shallowly furrowed at basal half, apex rectangular. Cerci long conical, surpassing hind margin of epiproct, apex blunt. Subgenital plate short conical, apex obtuse. Epiphallus with bridge semicircular; lateral plate with outer-lower corner acute angled; lophi nearly nearly oblong in lateral view, distal portion densely interspersed with granules; anchorae stout, pointing ahead and ventrad. Coloration. Body greyish-green or greyish-brown.Antennae with basal segments brown, others dark. Postocular bands black. Tegmen with anal area yellowish brown, others with basal portion dark and apical portion hyaline but costal area white in basal portion. Hind femur brown or greyish-brown, outer side with two blackish spots in most individuals. Hind tibia greyish-brown. Female. 5 th nymph, similar to male, but the notch on the posterior margin of pronotum deeper. Measurements (mm). Length of body: ♁11.5–12.4; length of pronotum: ♁ 2.4–2.5; length of hind femur: ♁ 7.5–7.6. Type material. Holotype: ♁, China, Sichuan, Xinlong (Tongxiao), 30.85° N, 99.94° E, 24 Aug. 2020, collected by Zhi-Pan Huang. Paratypes. 4♁, 1♀ (5 th nymph), same data, deposited in BMDU. Diagnosis. This new species is similar to L. muliensis, sp. nov., but differs from the latter in: 1) antennae not surpassing hind margin of pronotum, median segment mean 0.8 times as long as wide, in the latter antennae finely surpassing hind margin of pronotum, median segment mean 1.3 times as long as wide, 2) male tegmen with precostal area ending at 1/3 of whole length against 1/ 2 in the latter, 3) male 10 th abdominal tergite with very faint furculae instead of clear furculae in the latter. Etymology. The specific epithet refers to the type locality, Xinlong County, Sichuan Province, China. Distribution. CHINA: Sichuan.Published as part of Mao, Ben-Yong & Huang, Zhi-Pang, 2023, Taxonomy on three allied genera within Arcypterini (Orthoptera: Acrididae) from Qinghai-Xizang Plateau, China, pp. 265-279 in Zootaxa 5239 (2) on pages 271-272, DOI: 10.11646/zootaxa.5239.2.5, http://zenodo.org/record/762431
Shilinotrechus zhangfani Tian & Huang & Jia 2023, n. sp.
No full textShilinotrechus zhangfani n. sp. Figures 1a, 35−37 Material. Holotype male, cave Xianren Dong, Xi’er Township, Mile Shi, Honghe Hani &Yi Autonomous Prefecture, Yunnan Province, 103.20 E, 24.48 N, 1901 m above sea level, 2020-VIII-17, Mingyi Tian & Jingli Cheng leg., in SCAU. Diagnosis. Small-sized and stout trechine species, eyeless and depigmented, body concolourous brown. Description. Length: 4.9 mm; width: 1.8 mm. Habitus as in Figure 35. Body stout and strongly convex on dorsum; concolourous brown, but antennae, palps and tarsi slightly lighter; surface with fine and sparse pubescence; microsculpture engraved meshes irregularly isodiametric or polygonal on head, pronotum and elytra. For body much shorter than elytra, (HLm+PL) / EL = 0.71. Head slightly longer than wide, HLm/HW = 1.67, HLl/HW = 1.22; widest at about middle excluding mandibles, frontal furrows widened, nearly parallel-sided; two pairs of supraorbital pores present; clypeus 4-setose; labrum distinctly emarginate, 6-setose; right mandibular tridentate; mentum and submentum separated; mentum bisetose, base bi-foveate, tooth thick and short, bluntly bifid at tip; submentum sharply spined medially, 6-setose; mouthparts palps very thin and elongated; apical one in maxillae widened at base, narrowed towards apex, reverse in penultimate one; apical one in labium similar to that in maxillae, while penultimate one gently narrowed towards base; the 2 nd labial palpomere bisetose on inner margin, with three additional setae near apical portion, the 3 rd maxillary palpomere with four short set ae on apical half, other palps smooth and glabrous; the 2 nd labial palpomere 1.2 times longer than 3 rd; the 3 rd maxillary palpomere as long as 4 th; suborbital pores present. Antennae filiform, extending to 1/3 of elytra from base; scape stout, with several setae, as long as pedicel; pedicel to 11 th antennomeres pubescent; the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1,00) / 2 nd (1.00) / 3 rd (1.36) / 4 th (1.41) / 5 th (1.41) / 6 th (1.41) / 7 th (1.27) / 8 th (1.09) / 9 th (1.09) / 10 th (1.00) / 11 th (1.23). Pronotum subtrapezoidal, wider than head, PW/HW = 1.33, clearly wider than long, PW/PL = 1.26; lateral margins finely bordered, widely and upwardly reflexed throughout, more so near base; hind angles obtuse, fore angles protruding; base much wider than front, PbW/PfW = 1.42; base shallowly bisinuate, slightly convex backwardly in median portion, front straight; two marginal setae present, the anterior located at about 1/6 from front, and a little after the front angles, the posterior at hind angle. Scutellum very small. Elytra elongate, amygdaloidal, base more widened than apices; longer than wide, EL/EW = 1.53, much wider than pronotum, EW/PW = 1.72, more than two times longer than pronotum, EL/PL = 3.26, widest at about 1/4 from base; shoulders broadly protruding, lateral margins ciliate throughout; striae deep, the 8 th stria invisible; apical recurrent striole short; chaetotaxy (Figure 36A): basal pore present; two dorsal setiferous pores present along stria 3 before and behind middle of elytra respectively; the preapical dorsal pore present, located in the anastomosis of 3 rd and 4 th striae, closer to elytral suture; the humeral group of marginal umbilicate pores not aggregated, 1 st pore forwardly shifted; 1 st and 2 nd pores close to the marginal gutter; middle group (5 th and 6 th pores) locate before middle of elytra, not very close to each other; the anguloapical pore absent. Legs slender, protibiae without longitudinal sulcus.the 1 st tarsomere much shorter than 2 nd –4 th tarsomeres together in fore leg, whereas as long as and longer than those in middle and hind legs respectively. The 1 st protarsomere enlarged and widened, not denticulate inwardly at apex in male. Underside smooth and mostly glabrous in head and thorax; abdominal ventrites shortly and sparsely pubescent sparsely setose; IV−VI each with two paramedial setae; VII bisetose in male. Male genitalia (Figure 36B, C): The median lobe of aedeagus very short and stout, moderately sclerotised, basal portion strongly bent ventrally; apical part nearly straight, parallel-sided until apex, which suddenly contracted and widely broad; in dorsal view, apical lobe gradually widened toward apex, which is broadly rounded, copulatory piece extending over apex; basal orifice small, with a small sagittal aileron; copulatory piece large and long, about 2/7 as long as the median lobe; parameres thin and elongated, slightly shorter than the median lobe, each bearing with three long setae at apex. Female: Unknown. Remarks. It is the fourth species of the Yunnan’s endemic genus Shilinotrechus Uéno, 2003. It differs from other congeners by thinner body, shoulders of elytra strongly protruded, the 1 st marginal umbilicate pore evidently shifted forwardly, and in particular the strongly bent male genitalia (Uéno 2003, Huang & Tian 2015, Huang et al. 2020b). Etymology. This new species is named in honour of Mr. Fan Zhang (Institute of Geology, Yunnan University, Kunming), who is a leading caver in Yunnan Province. Distribution. China (Yunnan).Known only from the limestone cave called Xianren Dong in Mile Shi (Figure 1a). Xianren Dong is located on the left side of Road X016 about 7 kilometres from Xi’er Town. The length remains unknown, with a small entrance. Inside the cave, the humidity was rather high. Bats, two species of millipedes and growing mould were also observed inside the cave in addition to the unique trechine beetle, which was discovered under a stone in the inner most part of the main passage (Figure 37). Genus Guizhaphaenops Vigna Taglianti, 1997Published as part of Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), pp. 1-66 in Zootaxa 5243 (1) on pages 54-57, DOI: 10.11646/zootaxa.5243.1.1, http://zenodo.org/record/764240
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