4,502 research outputs found
Mapping landslides in lunar impact craters using Chebyshev polynomials and DEM's
No full textGeological slope failure processes have been observed on the Moon surface for decades, nevertheless a detailed and exhaustive lunar landslide inventory has not been produced yet. For a preliminary survey, WAC images and DEM maps from LROC at 100 m/pixels have been exploited in combination with the criteria applied by Brunetti et al. (2015) to detect the landslides. These criteria are based on the visual analysis of optical images to recognize mass wasting features. In the literature, Chebyshev polynomials have been applied to interpolate crater cross-sections in order to obtain a parametric characterization useful for classification into different morphological shapes. Here a new implementation of Chebyshev polynomial approximation is proposed, taking into account some statistical testing of the results obtained during Least-squares estimation. The presence of landslides in lunar craters is then investigated by analyzing the absolute values off odd coefficients of estimated Chebyshev polynomials. A case study on the Cassini A crater has demonstrated the key-points of the proposed methodology and outlined the required future development to carry out
Eigenvalues of complex unit gain graphs and gain regularity
No full textA complex unit gain graph (or T -gain graph) Γ = (G, γ) is a gain graph with gains in T , the multiplicative
group of complex units. The T -outgain in Γ of a vertex v ∈ G is the sum of the gains of all the arcs
originating in v. A T -gain graph is said to be an a-T -regular graph if the T -outgain of each of its vertices is
equal to a. In this article, it is proved that a-T -regular graphs exist for every a ∈ R. This, in particular, means
that every real number can be a T -gain graph eigenvalue. Moreover, denoted by Ω(a) the class of connected
T-gain graphs whose largest eigenvalue is the real number a, it is shown that Ω(a) is nonempty if and only if a
belongs to {0} ∪ [1, +∞). In order to achieve these results, non-complete extended p-sums and suitably defined
joins of T -gain graphs are considered
Study of the solar signal in mean Central Europe temperature series from 1760 to 1998.
No full textWe used a new series, highly reliable and representing the mean surface temperature of Central Europe for the period 1760-1998, to study Sun-Climate relationships. The results indicate that the influence of solar activity is evident only on a long time scale, in particular for the period 1860-present. On a short time scale it is not directly evident. From the spectral analysis we deduced that the strength of solar signal in the temperature series has an intermittent behaviour. We proposed a mechanism of resonance between the two non-linear systems, the Sun and Earth climate, to explain our results
Realizzazione per l'Italia di una banca dati climatologica di serie storiche strumentali ultrasecolari
No full textVariazioni nella frequenza e nell'intensità delle precipitazioni giornaliere in Italia negli ultimi 120 anni
No full textGlobal warming, analisi delle serie storiche italiane
No full textRicostruire l’andamento del clima sulla base dei dati storici non è impresa facile. Le serie storiche sono spesso affette
da errori o disomogeneità talmente rilevanti da non fornire informazioni univoche. Per migliorare il grado di
conoscenza sul cambiamento climatico in Italia è stato necessario mettere a punto una metodologia di analisi
adeguata individuando aree con le stesse caratteristiche climatiche e con un sufficiente numero di stazioni. Per
quanto riguarda le temperature si osserva una crescita uniforme nelle diverse regioni climatiche italiane, con un
trend dell’ordine di un grado per secolo, mentre le precipitazioni sono generalmente in diminuzione
Trichocera (Saltrichocera) maculipennis subsp. punctipennis Brunetti 1912
No full textTrichocera (Saltrichocera) maculipennis punctipennis Brunetti, 1912 (Figs. 1–6, 10–13) Trichocera punctipennis Brunetti, 1912: 511, Fig. 13. Trichocera (Saltrichocera) punctipennis: Krzemińska 2002: 204. Trichocera maculipennis ssp. pictipennis Alexander, 1930: 106, syn. n. Trichocera (Saltrichocera) sapporensis Alexander, 1935: 525, Figs. 1, 25, syn. n. Distribution. Japan (Alexander 1930; 1935), India (Brunetti 1912) and Korea (the present study). Examined material (Fig. 36): 1 male (pinned), Japan, Sapporo, Sept. 1922, coll. S. Kuwayama (holotype #5712 of Trichocera sapporensis, USNM) (Figs. 1, 10); 1 female (pinned), 30.09– 04.10.1897; 1 female (pinned), 0 7.10.1897, Russia, Sidemi, South Ussuri kray (currently Bezverkhovo, Primorsky kray), A. M. Yankovsky (T. (S.) maculipennis pictipennis , det. C. P. Alexander, ZIN) (Fig. 4); 1 male (pinned), India, c. 7000 ft., Simla Hills 25.04.1907, N. Annandale, Brunetti B. M., 1927–184 (T. (S.) maculipennis punctipennis , det. E. Krzeminska, BMNH); 1 male (pinned), India Theog c. 8000 ft., Simla Hills 27.04.1907, N. Annandale, Brunetti B. M. 1927–184 (T. (S.) maculipennis punctipennis , det. E. Krzeminska, BMNH); 1 female (pinned), India, Kasauli, March, Col. S. R. Christophers, B. M. 1923–107 (T. (S.) maculipennis punctipennis , det. E. Krzeminska, BMNH); 1 female (pinned), India, Naini Tal., 6700 ft., 15.02.1934, J. A. Graham, Brit. Mus. 1934–143 (T. (S.) maculipennis punctipennis , det. E. Krzeminska, BMNH); 1 male (pinned), India, Naini Tal., 6700ft., 0 1.03.1934, J. A. Graham, Brit. Mus. 1934–263 (T. (S.) maculipennis punctipennis , det. E. Krzeminska, BMNH) (Figs. 5, 12, 13); 1 female (pinned), North Korea, Ompo, 600 ft., 19.09.1937, coll. A. M. Yankovsky (USNM); 2 females (pinned), N. Korea, Potani Paiktusan, 6000 ft., 26.07.1940, coll. A. M. Yankovsky (USNM); 1 male, Korea, Mt. Kongo, 0 8.10.1933, coll. Machida (USNM); 1 male (pinned), Korea 15 miles ENE of Seoul, # 44, 28.11.1954, coll. G. W. Byers (USNM); 1 female (in ethanol), S. Korea, Gangwon-do, Jeongseon-gun, Hoedong-ri, Jeongseon-eup, Gwangsangol, Mt. Gariwangsan, 21.04– 13.05.2009, (st. 6), coll. W. Y. Choi et al., Malaise trap (NIBR); 1 female (in ethanol), S. Korea, Gangwon-do, Inje-gun, Girin-myeon, Bangdong-ri, Mt. Bangtaesan, 04.05– 28.05.2010, st. 3, coll. H.- W. Byun et al., Malaise tr. (NIBR); 5 males (Figs. 2, 11), 1 female (Fig. 3) (in ethanol), S. Korea, Gangwon-do, Pyeongchang-gun, Jinbumyeon, Dongsan-ri, Odaesan NP, N37.76583, E128.57727, alt. 768 m, st. 2, 30.10– 28.11.2013, coll. S.- J. Park, S.- B. Oh, Flight interception trap (NIBR); 2 males, 2 females (in ethanol), S. Korea, Gyeongsangbuk-do, Yeongju-si, Punggi-eup, Gyochon-ri, Ba-ro, Sobaek-san (Mt.) NP, 0 3.04.2015, coll. Korea National Park Service, Malaise trap (NIBR). Notes. Wing venation and darkened pattern of the above mentioned specimens from Korea were found to be almost identical with those of the holotype of T. sapporensis Alexander, 1935 known from Hokkaido, Japan. Male aedeagal complexes also look conspecific; although as the slide of the holotype of T. sapporensis is flattened, it is not easy to compare these structures, the parameres are wide at the basal part both in the holotype and in the other examined specimens from Korea. The distinct difference can be seen in the basal part of gonostyles. The holotype of T. sapporensis lacks any projections on gonostyles, while the specimens from Korea examined by us have small basal tubercles on gonostyles. This feature, together with the general form of the genitalia and wing venation seem to be typical for T. maculipennis. Nominal subspecies of T. maculipennis usually has five dark areas on the wing; however, T. (S.) maculipennis pictipennis Alexander, 1930 has more, and a rather clear band across the radial field (Figs. 3, 4), like that seen in our specimens collected from Korea. While describing subspecies pictipennis, C. P. Alexander designated as one of the paratypes the following specimen: “1 sex?, Sapporo, September 1922 (S. Kuwayama)” (Alexander 1930)—a specimen probably from the same catch as the holotype of the later described T. sapporensis (Alexander 1935). T. Nakamura and T. Tachi (Japan) reportedly attempted to collect T. sapporensis in Sapporo for many years without success, as all the males they caught had a basal tubercle on the gonostyli (pers. comm.). The male holotype of T. sapporensis seems to be an aberrant form of T. maculipennis pictipennis, lacking the basal tubercle on the gonostyli. Specimens of T. (S.) punctipennis Brunetti, 1912 examined by us or illustrated by Brunetti (1912) in the original description have the same pattern of wing markings as T. maculipennis pictipennis (Figs. 4, 6); moreover, the male and female terminalia (Figs. 12, 13), antennae and tarsal claws are like those of typical T. maculipennis, so we consider T. (S.) punctipennis to be of subspecific rank and identical with T. (S.) maculipennis pictipennis Alexander, 1930 syn. n. As T. punctipennis has priority over T. (S.) maculipennis pictipennis and T. (S.) sapporensis syn. n., we consider these two later species to be synonyms of T. (S.) maculipennis punctipennis.Published as part of Petrašiūnas, Andrius & Podenas, Sigitas, 2017, New data on winter crane flies (Diptera: Trichoceridae) of Korea with description of a new species, pp. 561-575 in Zootaxa 4311 (4) on pages 565-566, DOI: 10.11646/zootaxa.4311.4.8, http://zenodo.org/record/84845
Neoempheria ferruginea Brunetti 1912
No full textNeoempheria ferruginea (Brunetti, 1912) (Fig. 1 a–f) Mycomya ferruginea Brunetti, 1912: 74; Senior-White 1922: 84. [Japanese name: nagamado-kinoko-bae] Description. Head (Fig. 1 a): yellow in ground color, with dark brown mark on occiput and dark brown stripes along occipital and frontal furrows. Frons bare. Lateral ocelli on black well-developed ocellar prominence. Ocellar setae absent. Face yellow. Mouthparts short. Clypeus yellow, triangular, with scattered setae at apical margin. Palpus dark brown. Antenna 4.5 times as long as head, shorter than head and thorax together. Scape and pedicel yellow. Pedicel with single seta slightly shorter than 1 st flagellomere. Flagellum dark brown. Thorax (Fig. 1 b): yellow in ground color. Scutum with 5 dark brown stripes (1 medial, 2 sublateral and 2 lateral). Setae present on each stripe. Scutellum with 2 pairs of lateral setae. Wing (Fig. 1 c): hyaline, tinged with dark brown on apical 1 / 4 and posterior margin, distinct dark brown mark on each of veins Rs and R 4. Vein sc-r ending in basal 1 / 4 of anterior margin of cell r 1. Cell r 1 4 times as long as wide. Halter yellow, tinged with dark yellow in knob. Legs (Fig. 1 d): yellow. Tibia with erect setae slightly shorter than diameter of tibia. Abdomen (Fig. 1 b): yellow in ground color, with dark brown stripes on each abdominal tergite. Male genitalia (Fig. 1 e): yellow in ground color. T 9 with dorsal projection flattened dorsoventrally, bearing numerous setae on ventral side, tapered to apex. FIGURE 1. Lectotype of Mycomya ferruginea Brunetti, 1912. a, head in anterior view. b. thorax in dorsal view. c. right wing in ventral view. d. imago in right lateral view. e. apex of abdomen in posterior view. f. labels. Note that the original photo of the wing was horizontally flipped. Abbreviations: dp, dorsal projection of of tergite 9; R 4 and R5, 4th and 5 th radial veins; r 1 and r4, 1st and 4 th radial cells; cu p, posterior branch of cubital vein; a1, 1st branch of anal vein. Photographs examined. Lectotype, here designated. INDIA: 1 ♂, “Kurseong/ 5000 Feet [= 1500m]/ E. Himalayas/ 3 -VII-08 ”, “Myco/ ferruginea / Brun. Type ♂”, “Myco/ ferruginea / ♂”, “ TYPE ”, “ 1904 / 20 ” (ZSI) (Fig. 1 f). Distribution. India (Darjeeling, Kolkata, Shillong) (Brunetti 1912; Senior-White 1922), Sri Lanka (Peradeniya) (Senior-White 1922). Remarks. Brunetti (1912) described this species based on two males and one female, without explicitly designating a holotype, though the specimen from Kurseong was labeled as type when examined later (Edwards 1924). ZSI holds only a single male from Kurseong with type labels (Fig. 1 f) (Dr. S. Sheela, pers. comm.) and it is designated here as the lectotype. As Edwards (1924) noted, the wing marks of the lectotype (Fig. 1 c) are different from figure 12 of Brunetti (1912) in the following points: the wing anterior to veins M and R 4 + 5 is hyaline and has distinct dark marks on veins Rs and R 4; the dark brown mark in cell r 4 is continuous to cell cua 1 via the apex of cell r 5, all of cell m 1, and the apical portion of cell m; the brown mark in cell m 1 fills the entire cell; and the brown mark on cell cu p expands into the apical half of the cell.Published as part of Sueyoshi, Masahiro, 2014, Taxonomy of fungus gnats allied to Neoempheria ferruginea (Brunetti, 1912) (Diptera: Mycetophilidae), with descriptions of 11 new species from Japan and adjacent areas, pp. 139-164 in Zootaxa 3790 (1) on pages 140-141, DOI: 10.11646/zootaxa.3790.1.6, http://zenodo.org/record/22671
- …
