197,991 research outputs found
Dynamical scaling and generalized Omori law
No full textThe power law decay of the aftershocks rate is observed only after a characteristic time scale c. The dependence of c on the mainshock magnitude MM and on the lower cut-off magnitude M(I) is well established. By considering ten sequences recorded in the California Catalog we show that the aftershock number distribution becomes independent of both M(M) and M(I) if time is rescaled by an appropriate time scale fixed by the difference M(M) - M(I). This result is interpreted within a more general dynamical scaling hypothesis recently formulated, relating time differences to magnitude differences. The above hypothesis gives predictions in good agreement with the recent findings by Peng et al. ( 2007). Citation: Lippiello, E., M. Bottiglieri, C. Godano, and L. de Arcangelis ( 2007), Dynamical scaling and generalized Omori law
{Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and Planck. I. Construction of CMB lensing maps and modeling choices}
No full textJoint analyses of cross-correlations between measurements of galaxy positions, galaxy lensing, and lensing of the cosmic microwave background (CMB) offer powerful constraints on the large-scale structure of the Universe. In a forthcoming analysis, we will present cosmological constraints from the analysis of such cross-correlations measured using Year 3 data from the Dark Energy Survey (DES), and CMB data from the South Pole Telescope (SPT) and Planck. Here we present two key ingredients of this analysis: (1) an improved CMB lensing map in the SPT-SZ survey footprint and (2) the analysis methodology that will be used to extract cosmological information from the cross-correlation measurements. Relative to previous lensing maps made from the same CMB observations, we have implemented techniques to remove contamination from the thermal Sunyaev Zel'dovich effect, enabling the extraction of cosmological information from smaller angular scales of the cross-correlation measurements than in previous analyses with DES Year 1 data. We describe our model for the cross-correlations between these maps and DES data, and validate our modeling choices to demonstrate the robustness of our analysis. We then forecast the expected cosmological constraints from the galaxy survey-CMB lensing auto and cross-correlations. We find that the galaxy-CMB lensing and galaxy shear-CMB lensing correlations will on their own provide a pffiffiffiffiffiffiffiffiffiffiffiffiffifficonstraint on S8 1/4 sigma 8 omega m=0.3 at the few percent level, providing a powerful consistency check for the DES-only constraints. We explore scenarios where external priors on shear calibration are removed, finding that the joint analysis of CMB lensing cross-correlations can provide constraints on the shear calibration amplitude at the 5% to 10% level
ANALISIS REKAHAN GEMPA BUMI DAN GEMPA BUMI SUSULAN DENGAN MENGGUNAKAN METODE OMORI
No full textAbstract:Analysis of Fracture Earthquakes and Earthquake Supplementary Using Omori Method. It has been conducted research on fracture analysis of aftershocks and the relationship between the law Omori and aftershock in the northeastern city of Soroako dated February 15, 2011. From the data as much as 190 aftershocks incident, obtained fracture longest aftershock of 1.722 km with seismic energy 1.6737 x 1015 J and the speed of earthquake fissures 79.629 m/s while the shortest fracture energy of 0.331 to 1.45 x 1013 J quake and speed earthquake fracture 1.327 m / s. The end time of analysis or prediction of aftershocks obtained by the method of Omori in 20 days. So on the 20th day of the quake, aftershocks will end with a frequency of earthquakes only once a day.Abstrak:Analisis Rekahan Gempa bumi dan Gempa bumi Susulan dengan Menggunakan Metode Omori. Telah di lakukan penelitian analisis rekahan gempa susulan dan hubungan antara gempa susulan dengan Hukum Omori di wilayah timur laut kota Soroako tanggal 15 Februari 2011. Dari data gempa susulan sebanyak 190 kejadian, di peroleh rekahan terpanjang gempa susulan sebesar 1,722 km dengan energi gempa 1,6737 x 1015 J dan kecepatan rekahan gempa 79,629 m/s sedangkan rekahan terpendek sebesar 0,331 dengan dengan energi gempa 1,45x 1013 J dan kecepatan rekahan gempa 1,327 m/s. Analisis atau prediksi Waktu berakhirnya gempa susulan dengan metode Omori di peroleh 20 hari. Jadi pada hari ke 20 dari gempa utama, gempa susulan akan berakhir dengan frekuensi gempa hanya satu kali dalam satu hari.Kata kunci : gempa susulan, hukum omori, rekahan gempaIndonesia merupaka
On the Omori-Yau maximum principle and its applications to differential equations and geometry.
No full textAbstractIn this paper we prove a generalised version of the Omori-Yau maximum principle and describe some applications to problems in geometry and differential equations
Some Inequalities for the Omori-Yau Maximum Principle
No full textWe generalize A. Borbély’s condition for the conclusion of the Omori-Yau maximum principle for the
Laplace operator on a complete Riemannian manifold to a second-order linear semielliptic operator L with bounded coefficients and no zeroth order term. Also, we consider a new sufficient condition for the existence of a tamed exhaustion function. From these results, we may remark that the existence of a tamed exhaustion function is more general than the hypotheses in the version of the Omori-Yau maximum principle that was given by A. Ratto, M. Rigoli, and A. G. Setti
Belonometra kogoi Obuchi & Omori, 2015, n. sp.
No full textBelonometra kogoi n. sp. [New Japanese Name: Matsuba-Umishida] (Figs. 1–5) Types. Holotype : OMNH-Iv 5432, R 185 mm, west coast of Otsuki, Shikoku Island, Japan, 40.6 m depth, 7 March 2013, SCUBA, coll. M. Obuchi. Paratypes: OMNH-Iv 5433, R 200 mm, same data as OMNH-Iv 5432 (except depth, 30.4 m). OMNH-Iv 5434, R 190 mm, same data as Cr 130307 (except depth, 30.4 m). OMNH-Iv 5435, centrodorsal and radials, R estimated 180 mm, same data as OMNH-Iv 5432 (except depth, 27.0 m). OMNH-Iv 5436, R 115 mm, Horse Shoe Cliff, Onna, Okinawa Island, Ryukyu Islands, Japan, 18.0 m depth, 16 April 2013, SCUBA, coll. M. Obuchi. OMNH- Iv 5437 (dissected), R estimated 80 mm, Horse Shoe Cliff, Onna, Okinawa Island, Ryukyu Islands, Japan, 20.4 m depth, 16 April 2013, SCUBA, coll. M. Obuchi. Description of holotype. Centrodorsal low hemispherical, 7.8 mm across (Fig. 1 B); polar area narrow, slightly concave, 18 % of centrodorsal diameter, smooth without papillae; cirrus sockets closely crowded rather than forming regular rows (Fig. 3 A). Cirri numerous, XCVI (including XXV functional scars), slender, laterally compressed, easy to detach (Fig. 1 B). Peripheral cirri much longer than apical ones, 27–30 mm long, composed of 21–22 segments (Fig. 2 A); cirrals elongated except short proximal two, smooth without aboral keel or process except opposing spine; distal segments with flared distal end, especially on aboral side, overlapping base of next cirrals; c 1 L/ W 0.5; c 2 L/ W 1.0; c 3 L/ W 1.4 –1.7; c 4 L/ W 2.0 – 2.3; c 5–10 longest, L/ W 2.4 –3.0; following cirrals gradually decreasing in length, laterally compressed; antepenultimate L/ W 1.0; penultimate elongated again, L/ W 1.6 –1.8, with straight opposing spine on distal part; terminal claw curved, approximately as long as antepenultimate. Apical cirri approximately 15 mm long, composed of 16 segments; c 5–7 longest, L/W up to 2.7 (Fig. 2 B). FIGURE 2. Belonometra kogoi n. gen, n. sp. (A–K, OMNH-Iv 5432, holotype; K, OMNH-Iv 5436). A, peripheral cirrus; B, apical cirrus; C, proximal brachials; D, P 1; E, P 2; F, P 3; G, P 4; H, P 5; I, P m; J, P d; K, P 1 of small specimen. Scale bars 5 mm. Radials, also Ibr 1, completely concealed by centrodorsal (Fig. 2 C). Ibr 2 (axillary) proximally concealed by centrodorsal, connected to Ibr 1 by synarthry, 3.3 mm wide. Each ray well separated. Ten arms almost equal in length, 175 mm long, 3.0 mm wide at first syzygy. Brachials without aboral projection and modified distal end (Fig. 2 C); proximal four brachials oblong; br 1 united interiorly, W/L 3.0; br 2 completely separated from neighbor, with interior margin proximally notched, W/L 2.3; weak synarthrial tubercle present between br 1 and br 2; br 3 + 4 oblong, W/L 2.7: following brachials until middle arms (about br 60) wedgeshaped, gradually decreasing in length, each with aboral swellings on proximal edge of pinnule-bearing side and distal edge of side opposite pinnule, making proximal arms appear aborally rough; brachials on distal half of arms short, almost oblong, W/L 3.0–4.0, wider than long even at arm tips, with smooth surface (Fig. 1 C). First syzygy at br 3 + 4; second at br 9 + 10 (seven of ten) or br 10 + 11 (three); following at intervals of three (occasionally four) muscular articulations. Pinnules flagellate, greatly elongated except for short P 1 and P 2, lacking aboral carination, comb, side- and covering-plates, and terminal hook; comparative lengths P 1 =P 2 P 5 P 5 P 4>P 5 <P M≤P D; P 3 always longest of proximal pinnules; P 1 5.0–6.0 mm long, 24–26 segments; P 2 6.5 –7.0 mm long, 18–21 segments; P 3 14.3 –16.0 mm long, 28–31 segments; P 4 8.5–9.5 mm long, 23 segments; P 5 11.5 –12.0 mm long, 25–29 segments; P M up to 18.0 mm long, 33 segments; P D up to 20 mm long, 36 segments. Disk 17 mm in diameter. Skeletal morphology. OMNH-Iv 5435. Adoral surface of centrodorsal concave, rugged, with five interradial ridges and several radiating furrows (Fig. 3 B); interradial ridge with median groove, low and indistinct adjacent to opening of centrodorsal cavity, gradually becoming higher, highest and thickest at outer margin. Diameter of adoral opening of centrodorsal cavity 17 % of centrodorsal diameter; opening narrowed by overhanging rim at adoral edge; thus internal diameter of cavity probably larger than opening. Basal rosette located above proximal surface of radial pentagon, perforated centrally, with five radial and five narrower, not spout-like interradial processes (Fig. 4 A); basal rays rod-shaped, broad, each with distinct median groove, strongly curved upward and exposed as globular tubercles at each corner of radial pentagon (Fig. 4 B, 5 B); interior end of basal rays adjacent to thin circlet enclosing and slightly overhanging radial cavity. Radial cavity with sparse calcareous filling. Radial pentagon much smaller than centrodorsal in diameter, but each corner reaching almost to margin of centrodorsal (Fig. 5 A). Radial facets high trapezoidal with broadened bottom, H/ W 1.3, concaved (Fig. 5 B); muscular fossae almost parallel to oral-aboral axis, interarticular ligament fossae steep, and aboral ligament fossa more gently sloping; pairs of muscular and interarticular ligament fossae laterally separated from adjacent ones. Muscular fossae, thin, flange-like, slightly higher than interarticular ligament fossae, H/ W 1.5, deeply concave near intermuscular septum; intermusclar notch distinct; intermuscular septum broad, running from just above central nerve canal to near intermuscular notch, with deep median furrow. Interarticular ligament fossae proximally broadened, H/ W 1.3, shallowly concave, separated from muscle fossae by narrow diagonal ridge; lateral edge shallowly notched. Aboral ligament fossa low semicircular, much lower than interarticular ligament fossae, H/ W 0.3. Central nerve canal rounded square; ligament pit slightly larger than central nerve canal. Radial clefts distinct (Fig. 5 A). Cr 130416 d: small but mature specimen. Opening of centrodorsal cavity larger, 25 % of centrodorsal diameter; adoral edge of cavity thickened, forming distinct lip. Radial cavity without calcareous filling, completely empty. Radial facet with lateral margins not notched at interarticular ligament fossae. Coloration in life. Ground body color chrome yellow to dark brown (Fig. 1 A). Cirri khaki. Arms with two dark longitudinal lines gradually fading in distal arm, unclear in life but recognizable in preserved specimens (Fig. 1 B, C). Pinnules faded distally, yellow to whitish at tip; each pinnular with dark pigmentation on side toward arm tip; fleshy part of genital pinnules containing bright orange gonad (Fig. 1 D). Distal end of brachials and pinnulars sometimes whitish. Habitat and ecology. The specimens were found usually deeper and rarely shallower than 25 m in rocky areas in Kochi, and in small crevices on drop-offs of coral reefs at Okinawa Island. Living animals were usually located behind overhanging rocks, but sometimes exposed on pinnacles where current flows, exhibiting multidirectional posture in which pinnules were aligned in six rows along each arm (Fig. 1 A, C). When disturbed, the animals vigorously swam away from the substratum. Etymology. Named for Ichizo Kogo in recognition of his contributions to understanding the Japanese crinoid fauna. Remarks. Some characters are different between large and small specimens, suggesting difference with regards to individual growth. As mentioned above, in the small specimen, the size of centrodorsal cavity is smaller, and the overhanging lip on the adoral edge of the centrodorsal cavity is distinct. Distal arm brachials are short but not remarkably so in small specimens. Aboral processes on proximal segments of proximal to middle pinnules are more distinct in small specimens, although this feature varies between the same-sized specimens, e.g., OMNH- Iv 5432 and OMNH-Iv 5434.Published as part of Obuchi, Masami & Omori, Akihito, 2015, A new genus and new species of family Antedonidae (Echinodermata: Crinoidea) from southern Japan, pp. 441-449 in Zootaxa 3972 (3) on pages 444-448, DOI: 10.11646/zootaxa.3972.3.9, http://zenodo.org/record/23324
Correlations and Omori law in spamming
No full textThe most costly and annoying characteristic of the e-mail communication system is the large number of unsolicited commercial e-mails, known as spams, that are continuously received. Via the investigation of the statistical properties of the spam delivering intertimes, we show that spams delivered to a given recipient are time correlated: if the intertime between two consecutive spams is small (large), then the next spam will most probably arrive after a small (large) intertime. Spam temporal correlations are reproduced by a numerical model based on the random superposition of spam sequences, each one described by the Omori law. This and other experimental findings suggest that statistical approaches may be used to infer how spammers operate. Copyright (c) EPLA, 200
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Comparing concept drift detection with process mining tools
No full textOrganisations have seen a rise in the volume of data correspondingto business processes being recorded. Handling process data is ameaningful way to extract relevant information from business processes with impact on the company's values. Nonetheless, businessprocesses are subject to changes during their executions, addingcomplexity to their analysis. This paper aims at evaluating currently available Process Mining tools that handle concept drifts, i.e.changes over time of the statistical properties of the events occurring in a process. We provide an in-depth analysis of these toolsbriefly comparing their differences, advantages, and disadvantages
Ramisyllis kingghidorahi n. Sp., a new branching annelid from Japan
No full text© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Aguado, M. T., Ponz-Segrelles, G., Glasby, C. J., Ribeiro, R. P., Nakamura, M., Oguchi, K., Omori, A., Kohtsuka, H., Fisher, C., Ise, Y., Jimi, N., & Miura, T. Ramisyllis kingghidorahi n. Sp., a new branching annelid from Japan. Organisms Diversity & Evolution. (2022), https://doi.org/10.1007/s13127-021-00538-4.Among over 20,000 species of Annelida, only two branching species with a highly modified body-pattern are known until now: the Syllidae Syllis ramosa McIntosh, 1879, and Ramisyllis multicaudata Glasby et al. (Zoological Journal of the Linnean Society, 164, 481–497, 2012). Both have unusual ramified bodies with one head and multiple branches and live inside the canals of host sponges. Using an integrative approach (combining morphology, internal anatomy, ecology, phylogeny, genetic divergence, and the complete mitochondrial genome), we describe a new branching species from Japan, Ramisyllis kingghidorahi n. sp., inhabiting an undescribed species of Petrosia (Porifera: Demospongiae) from shallow waters. We compare the new species with its closest relative, R. multicaudata; emend the diagnosis of Ramisyllis; and discuss previous reports of S. ramosa. This study suggests a much higher diversity of branching syllids than currently known. Finally, we discuss possible explanations for the feeding behaviour in the new species in relation to its highly ciliated wall of the digestive tubes (especially at the distal branches and anus), and provide a hypothesis for the evolution of branching body patterns as the result of an adaptation to the host sponge labyrinthic canal system.Open Access funding enabled and organized by Projekt DEAL. This study was financed by the Biodiversitätsmuseum (PI:MTA), Georg August University, Göttingen, and by Grant-in Aid for Scientific Research A (No. 18H04006) (PI:TM) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. GP-S was supported by the “Contratos Predoctorales para la Formación de Doctores 2016” program of MINECO, Spain (code: BES-2016–076419), co-financed by the European Social Found. RPR was supported by the program “Contratos predoctorales para Formación de Personal Investigador, FPI-UAM,” Universidad Autónoma de Madrid
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