332,690 research outputs found
A Berger type normal holonomy theorem for complex submanifolds
No full textWe prove a kind of Berger-Simons' Theorem for the normal holonomy group of a complex submanifold of the projective spac
Holonomy and submanifold geometry
No full textWe survey applications of holonomic methods to the study of submanifold geometry, showing the consequences of some sort of extrinsic version of de Rham decomposition and Berger's Theorem, the so-called Normal Holonomy Theorem. At the same time, from geometric methods in submanifold theory we sketch very strong applications to the holonomy of Lorentzian manifolds. Moreover we give a conceptual modern proof of a result of Kostant for homogeneous space
Le voci del Medioevo. Testi, immagini, tradizioni
No full textContributi vari su testi, immagini, tradizioni nelle letterature medieval
Concise Process Improvement Methods
No full textThis thesis reviews two methodologies for process improvement; Six Sigma and the Shainin System. A strengthened methodology is developed following the 12-step Six Sigma DMAIC cycle with an added Shainin loop in the Analyse phase to narrow down sources of variation. This Hybrid Six Sigma framework is used to develop a sampling strategy known as the Process Variation Diagnostic Tool (PVDT).
The PVDT allows a Gage R&R and a Provisional Process Capability study to be carried out with just 20 samples. It also allows for an IsoplotSM and a Shainin Multi-Vari study. The method was then reviewed in three different industrial situations to demonstrate its effectiveness. Applying the PVDT allowed the project teams involved to quickly produce Gage R&R and Provisional Process Capability Studies. It reduced samples required from the combined 110 measurements from 60 products typically taken in industry to 60 measurements from 20 products. A significant advantage was the ability to extract a Shainin Multi-Vari Study from measurements taken for the PVDT. This technique allowed the project team the ability to categorise the most significant families of variation. From these case studies it can be seen that at the border of the Measure/Analyse phase in Six Sigma the proposed PVDT offers an efficient method of collecting Six Sigma metrics and steering the course of an improvement project.
A teaching vehicle known as the PIM game is introduced to demonstrate and facilitate the teaching of a number Process improvement Method. These methods are directly related to Six Sigma and Shainin methods developed in this thesis. The historical development and need for a teaching game are discussed.
Finally the thesis proposes a new method of destructive measurement system analysis (MSA). An industrial problem is used to benchmark the method against a traditional approach to destructive MSA. The project highlights when there is a second non-destructive test a conservative estimate of Gage R&R can be determined for destructive test equipment
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Sternarchorhynchus mareikeae Santana & Vari 2010, SP. NOV.
No full textSTERNARCHORHYNCHUS MAREIKEAE SP. NOV. <p>(FIGS 50, 53, 54; TABLE 9)</p> <p> <i>Sternarchorhynchus oxyrhynchus</i>, Ferreira, 1995: 51 [in listing of species from Brazil, Rio Trombetas, Pará, Cachoeira Porteira].</p> <p> <i>Diagnosis: Sternarchorhynchus mareikeae</i> is distinguished from congeners by the following combination of characters: a short gape that terminates posteriorly at, or slightly short of, the vertical through the anterior nares, the lateral line that extends posteriorly to the base of caudal fin, the presence of a definite series of scales along the mid-dorsal region of the body, the presence of a narrow, more lightly coloured middorsal stripe on the head with the stripe sometimes extending posteriorly along the body to the vertical through the insertion of the pectoral fin, the dark anal fin, the possession of 12–13 teeth in the outer row of the dentary, 12–13 teeth in the outer row of the dentary with a total of 16–17 teeth on that jaw, 159–181 total anal-fin rays, nine to 11 scales above the lateral line at the midbody, 16 precaudal vertebrae, the distance from the snout to the anus in mature males (8.8–10.8% of LEA), the preanal distance (12.2–17.8% of LEA; 12.2–15.2% in mature males), the caudal length (13.4–17.4% of LEA), the head length (18.3–23.2% of LEA), the prepectoral-fin distance (17.9–23.1% of LEA), the postocular distance (36.0–41.3% of HL), the pectoral-fin length (35.0– 40.9% of HL; 37.5–40.9% in mature males), the head depth at the eye in mature males (29.9–38.4% of HL), the head depth at the nape (45.1–53.4% of HL), the distance from the posterior naris to the eye in mature males (52.3–53.7% of HL), the eye diameter (3.5–5.3% of HL), the interocular width (6.6–9.0% of HL), the postocular distance (36.0–41.3% of HL), the height of the branchial opening in mature males (12.3–15.4% of HL), the tail depth (7.1–10.2% of caudal length), and the caudal-fin length (18.5–24.7% of caudal length).</p> <p> <i>Description:</i> Morphometric data for examined specimens in Table 9.</p> <p>Lateral line extending posteriorly to base of caudal fin, but absent on fin. Snout elongate, compressed and slightly curved ventrally along anterior portion. Mouth terminal to very slightly anterodorsally orientated and relatively small with distinct fleshy pad at anterior of lower jaw. Rictus located anterior to vertical through anterior naris. Anus and urogenital papilla located ventral to head and along vertical about three orbital diameters anterior of eye in both mature males and females. Combined opening for anus and urogenital papilla longitudinally ovoid in all specimens.</p> <p> Premaxilla with 12–13 teeth (<i>N</i> = 7) apparent in whole specimens. Dentary with two tooth rows; outer row with 12–13 teeth and inner row with three to four teeth (<i>N</i> = 5).</p> <p> Branchiostegal rays five; with first to third rays narrow and elongate and fourth and fifth rays large and broad. Precaudal vertebrae 16 (12 anterior; four transitional; <i>N</i> = 9).</p> <p> Pectoral-fin rays ii + 10–12 [ii + 12] (<i>N</i> = 10). Analfin origin located anterior to opercle. Anterior unbranched anal-fin rays 15–26 [23] (<i>N</i> = 8). Total anal-fin rays 159–181 [170] (<i>N</i> = 10). Scales above lateral line at midbody nine to 11 [9] (<i>N</i> = 10). Scales present along mid-dorsal line to origin of midsaggital electroreceptive filament. Origin of midsaggital electroreceptive filament located on posterior half of body, approximately at 60% of TL. Filament extending posteriorly four to seven scales beyond vertical through posterior terminus of base of anal fin. Tail compressed and moderate, ending in small, elongate, pointed caudal fin. Caudal-fin rays 12–14 (<i>N</i> = 6).</p> <p> <i>Coloration in alcohol:</i> Overall coloration brown. Head dark brown overall laterally other than for more lightly coloured stripe extending along lateral surface of snout. Darker coloration anterior of eye along dorsal surface of snout forms lateral margin of very narrow, lightly coloured mid-dorsal stripe along snout that terminates in rear portion of head. Body dark overall, somewhat more so dorsally. Pectoral fin dusky with rays somewhat darker than membranes. Anal fin dusky with rays darker than membranes. Caudal fin dark.</p> <p> <i>Distribution: Sternarchorhynchus mareikeae</i> is only known from the type locality at Cachoeira Porteira along the Rio Mapuera, Pará, Brazil (Fig. 50).</p> <p> <i>Secondary sexual dimorphism: Sternarchorhynchus mareikeae</i> is possibly sexually dimorphic in terms of body size. Mature females(<i>N</i> = 5) reach a maximum of 160 mm TL, whereas mature males collected with those specimens attain a maximum of 221 mm TL. This species matures at relatively small body sizes as indicated by a 131 mm TL female filled with welldeveloped eggs and a 176 mm TL male with mature testes.</p> <p> <i>Etymology:</i> The species name, <i>mareikeae</i>, is in honour of the German biologist Mareike Roeder who has greatly added to the senior author’s life.</p> <p> <i>Remarks:</i> Examination of the specimens cited from Cachoeira Porteira as <i>S. oxyrhynchus</i> by Ferreira (1995: 51) has shown that some are rather <i>S. mareikeae. Sternarchorhynchus mareikeae</i> occurs in the same river basin as <i>S. inpai</i> and the two species have similar coloration patterns. They differ both in the numbers of teeth in the upper and lower jaws and also in the various features involving mature males that were cited in the Diagnosis and summarized under Remarks for <i>S. inpai</i>.</p> <p> <i>Material examined</i></p> <p> <i>Holotype: –</i> BRAZIL. <i>Pará</i>: Rio Trombetas, Cachoeira Porteira, last fall before Rio Trombetas (approximately 1°05′S 57°02′W), collected by E. Ferreira and M. Jégu, 19.iv.1985; INPA 22896, 192.0 mm TL, male.</p> <p> <i>Paratypes: –</i> BRAZIL. <i>Pará</i>: Rio Trombetas, Cachoeira Porteira, last fall before Rio Trombetas (approximately 1°05′S 57°02′W), collected by E. Ferreira and M. Jégu, 19.iv.1985, INPA 22901, 9 (60–120, one specimen cleared and stained); INPA 22900, 3 (125– 148); USNM 391717, 1 (177).</p>Published as part of <i>Santana, Carlos David De & Vari, Richard P., 2010, Electric fishes of the genus Sternarchorhynchus (Teleostei, Ostariophysi, Gymnotiformes); phylogenetic and revisionary studies, pp. 223-371 in Zoological Journal of the Linnean Society 159 (1)</i> on pages 317-318, DOI: 10.1111/j.1096-3642.2009.00588.x, <a href="http://zenodo.org/record/5439293">http://zenodo.org/record/5439293</a>
Small points on subvarieties of a torus
No full textLet V be a subvariety of a torus defined over the algebraic numbers. We give a qualitative and quantitative description of the set of points of V of height bounded by invariants associated to any variety containing V . Especially, we determine whether such a set is or is not dense in V . We then prove that these sets can always be written as the intersection of V with a finite union of translates of tori of which we control the sum of the degrees. As a consequence, we prove a conjecture by the first author and David up to a logarithmic factor
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Syncomistes , Vari 1978
No full textGENUS: SYNCOMISTES Syncomistes, Vari 1978: 311 Type species. Syncomistes butleri, Vari 1978, by original designation. Etymology. The generic name, Syncomistes is a masculine Greek noun meaning gatherer. It refers to the unique manner in which members of the genus harvest algae when feeding. Diagnosis (modified from Vari 1978). A highly distinctive genus of the family Terapontidae, distinguished by the following characters: medium sized (150–280 mm SL); body stout, slightly laterally compressed; covered with ctenoid scales; postorbital region and opercle scaled; inter-orbital smooth, with bony ridge above each orbit; two distinct opercular spines present, lower opercular spine the longer and more robust; preopercular spines serrate, longest and most robust on apex of preopercle, reduced in size dorsally and anteriorly; first and second dorsal fins joined; origin of first dorsal spine slightly anterior to vertical drawn through pelvic fin base; 11–13 dorsal spines (usually 12), 10–14 segmented rays; two proximal dorsal pterygiophores inserted between successive neural spines; pectoral fins asymmetrically pointed, 14–17 segmented rays; pelvic fins pointed, 1 spine, 5 segmented rays; anal fin with 3 spines, 7–11 segmented rays; caudal fin emarginated, 15–16 branched (usually 15) and 17–26 unbranched rays; vertebrae 25–26 (usually 25); gill rakers on lower arch 15–22, upper arch 6–13, short and stout to long and slender. Lower jaw flattened; dentary rolled outwards so pointing laterally; teeth flattened in most species (more rounded in S. carcharus and S. moranensis), tightly packed together, embedded in a jelly-like gum (gum hardened in S. carcharus and S. moranensis); outer tooth row enlarged, proceeded by a number of narrow inner series; bottom jaw with prominent, median positioned, dorsally directed bump at the dental symphysis; top jaw with median groove between premaxillaries, with both bump and groove being edentulous. The bump and groove structures and the lack of median dentition are characters considered autapomorphic to the genus within the family. Maxillary broader and more robust than species of other genera in the family, distinctive in shape with ascending processes being triangular and medial surfaces of ascending processes diverging from each other and being distinctly separated at tips (based on analysis of S. butleri s.l., S. trigonicus s.l. and S. kimberleyensis in Vari 1978). Highly modified hemispherical rostral cartilage with concavity on posterior surface and loose connections to premaxillaries; anterior surface of ethmoid with rounded anterior knob at point that contacts posterior concavity on rostral cartilage (based on analysis of S. butleri s.l., S. trigonicus s.l. and S. kimberleyensis in Vari 1978). Complex modification to the rostral cartilage and ethmoid considered autapomorphic to the genus within the family. Intestines particularly long for given body size; adults (undefined size) exhibit complex looping pattern with greater percentage of loops to left side of body cavity in median body plane. Fully developed intestinal pattern considered autapomorphic to Syncomistes. Included Species. Following this revision, the genus comprises 11 freshwater species distributed in northwestern Australia: four which are redescribed (S. butleri s.s., S. kimberleyensis, S. trigonicus s.s. and S. rastellus), and seven previously unrecognised (S. bonapartensis sp. nov., Syncomistes carcharus sp. nov., Syncomistes dilliensis sp. nov., Syncomistes holsworthi sp. nov., Syncomistes moranensis sp. nov., Syncomistes versicolor sp. and S. wunambal sp. nov.). As S. kimberleyensis was originally described from juvenile specimens alone, the redescription is also based on adult specimens. Formal descriptions for the seven previously unrecognised species are provided below.Published as part of Shelley, James J., Delaval, Aurélien & Le, Matthew C., 2017, A revision of the grunter genus Syncomistes (Teleostei, Terapontidae, Syncomistes) with descriptions of seven new species from the Kimberley region, northwestern Australia, pp. 1-103 in Zootaxa 4367 (1) on pages 23-24, DOI: 10.11646/zootaxa.4367.1.1, http://zenodo.org/record/112530
Car park management in Vari a.s.
No full textCílem práce je zefektivnění využívání vozového parku ve firmě Vari a.s. s důrazem na úsporu nákladů spojených s provozem, a to technicky i personálně. Práce se zabývá hodnocením řízení vozového parku včetně návrhů zlepšení. Návrhy řešení vycházejí ze studia informačních systému společnosti a zkušeností s jejich praktickým využitím.The thesis is focused on improvement of utilization of the car park of the company Vari a.s. including proposals for cost saving measures connected with technical and personal services. Proposed solutions are based on the analysis of the car park management processes, including the concept for improvement measures. These proposals are based on an assessment of information systems used in company Vari and practical experiences of managers with car park processes
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