881 research outputs found
Algorithms for quadratic matrix and vector equations
No full textThis book is devoted to studying algorithms for the solution of a class of quadratic matrix and vector equations. These equations appear, in different forms, in several practical applications, especially in applied probability and control theory. The equations are first presented using a novel unifying approach; then, specific numerical methods are presented for the cases most relevant for applications, and new algorithms and theoretical results developed by the author are presented. The book focuses on “matrix multiplication-rich” iterations such as cyclic reduction and the structured doubling algorithm (SDA) and contains a variety of new research results which, as of today, are only available in articles or preprints
Oedemera (Oedemera) svihlai Poloni 2023, n. sp.
No full textOedemera (Oedemera) svihlai n. sp. Figs 1-4, 10-11 Material examined Type Material. Holotypus, ♂: China: YUNNAN prov. // pass 50 km W Judian // 11.-13.vi.2005 // O. Nakládal lgt. (NMPC). Paratypi: same locality, 4 ♂, 2 ♀ (NMPC), 2♂, 1 ♀ (RP). Description of the male, holotype Coloration (Fig. 1). Integuments (head, thorax, elytra, abdomen and appendices) completely black, shiny and with a distinct blue-green metallic tinge on elytra. The whole surface covered with a sparse, short, recumbent white pubescence. External morphology. Body length: 5,5 mm. Head moderately rostrate, eyes distinctly protruding and sub-oval. Space between the scapes half of the interocular space. Surface of the head with no distinct depressions, smooth and without punctures, with sparse and short brown hairs. First and second maxillary palpomeres equal in length, last one 1.5 times longer. Antennae 11-segmented, the scape 3 times longer than the second antennomere and almost as long as the third one, the following progressively shortening. Last antennomere slightly emarginated at apex. Pronotum moderately cordiform, shiny, impunctate. The disc of pronotum glabrous, with only a few brown setae on the sides. The anterior and posterior margin of pronotum slightly emarginated. Elytra dehiscent, so that the first costae are separated in the posterior part in the median portion. Third vein and elytral suture raised, becoming fainter but still visible towards the elytral apex. Surface of elytra shiny and with a strong metallic tinge, the surface rugose. The legs surface micro-shagreened. Claws simple. Thorax with surface rugose. Abdomen smooth. The pubescence of both thorax and abdomen slightly longer than on legs. Pygidium ogival. Last ventrite simple, not emarginated at apex. Male genitalia: as in Figs 3-4, 10-11. Variation of paratypes Sexual dimorphism. Female differ from male in the following characters: a) bigger size (see below), b) central part of pronotum dark orange and basal and apical margins black, c) pygidium hastate and with more widely rounded apex, d) elytra more metallic (Figs 1-2). Hind femurs are very slightly thickened in males. Length. 8,5-10,2 mm (males); 10,1-12,6 mm (females). Variability. The type specimens show scarce variability in the extent and colour of elytral metallic tinge and in body size. Comparative diagnosis This species, according to male genitalia (parameres rounded distad) is more similar to O. (Oedemera) sichuana Švihla, 1999 which belongs to the O. femorata species group, as defined by Švihla (1999). The habitus, however, is more similar to O. (Oedemera) nigripes (Ganglbauer, 1890), having similar coloration and morphology. From O. sichuana it can be distinguished by a) the pronotum in females, almost completely orange (bearing only two orange lateral spots in O. sichuana), b) less thickened hind femurs in males and c) male genitalia: parameres more rounded distad and aedeagus straighter and not tapered. From O. nigripes it can be distinguished by a) wider parameres, with the apex converging to the center (divergent in O. nigripes) (Figs 3, 10, 12) and the aedeagus, straight and rounded at the apex (slightly curved and more tapered in the other species) (Figs 4, 11, 13) (Švihla 1999). Etymology. the species is named after Vladimir Švihla (1952-2015), renowned specialist of Oedemeridae that worked at the National Museum, Prague and contributed more than any other entomologist to the knowledge of the genus Oedemera.Published as part of Poloni, Riccardo, 2023, Two new species of the genus Oedemera from China (Coleoptera: Oedemeridae), pp. 57-60 in Fragmenta entomologica (Basel, Switzerland) (Basel, Switzerland) 55 (1) on pages 57-59, DOI: 10.13133/2284-4880/1463, http://zenodo.org/record/814838
Conference Report on 2015 IEEE Congress on Evolutionary Computation (IEEE CEC 2015) [Conference Reports]
No full textIEEE CEC 2015 was successfully held during May 24-28, 2015, at Sendai International Center, Sendai, Japan. Technical program consisted of 20 tutorials, 3 workshops, 7 competitions, 68 parallel sessions and 56 special sessions for 403 papers, along with a single poster session for 52 papers. The first joint reception for Women In Computational Intelligence, Young Professionals and Students was held on May 26, where all plenary speakers and TC chairs were invited to this event
Detailed Structural Calculation and Mechanical Measurement of the Insertion Device Support Structure for ELETTRA
No full textComputational modeling: valuable tool or math exercise?
No full textABSTRACT
Optimization techniques have been used in engineering design for decades maximizing a specific performance metric, ultimately cost of a product for a given performance. As a matter of fact most accepted theories of market efficiency for the past half century have focused on the single objective of maximizing the profit. The well known concept of Pareto Frontier has been used mainly to explain that at high risk corresponds a high reward and therefore any “non dominated” solution is equivalent.
More recently it has become widely accepted that a multi-objective approach is necessary for a more efficient decision making process about product development with sustainability in mind.
However a number of numerical technologies commonly grouped under the term “design optimization” can be used not only for product design but also to improve the quality in the modeling cof complex phenomena.
The design practice has therefore become an iterative process where decision making is performed on the basis of the compromise solutions quantitatively determined or estimated and the optimization methods are used for building the model, design a component or with high ambition face the product design at system level.
Through the description of practical examples the use of optimization for model calibration, for component design and finally for product design will be illustrated
The case of gente Rutheni, natione Poloni in Galicia
No full textIn this article, the author seeks to answer the question, since when the term gente Rutheni, natione
Poloni was used in public space in Galicia. This is the starting point to search for the answer
to the question of when the Ruthenians of Polish nationality in Galicia produced the idea defi ning
their identity and worldview. The author tries to reveal when the Ruthenians of Polish nationality
made an unsuccessful attempt to carry out their political demands, and how they were perceived
in the Polish-Ruthenian society of Galicia. Eventually gente Rutheni, natione Poloni disappeared
in the historical process because they had not created an explicit ideology and had not developed
a compact elite representing the group of Ruthenians of Polish nationality in the public space.
Outstanding individuals from this group functioned within Galician society, but they were more of
a tool (the subject) of the Polish policy, rather than an entity
Gli uomini d’affari pisani e la perdita della Sardegna. Qualche spunto di riflessione sul commercio pisano nel XIV secolo
No full textFIGURE 1 in The false-blister beetles (Coleoptera, Oedemeridae) of Oman with the description of a new species
No full textFIGURE 1. Probosca (Proboxantha) coniuncta n. sp., holotype male (a), paratype female (b), paratype male, variability (c).Published as part of Poloni, Riccardo, 2022, The false-blister beetles (Coleoptera, Oedemeridae) of Oman with the description of a new species, pp. 421-429 in Zootaxa 5162 (4) on page 423, DOI: 10.11646/zootaxa.5162.4.6, http://zenodo.org/record/681043
Permuted graph matrices and their applications
No full textA permuted graph matrix is a matrix V ∈ C(m+n)×m such that every row of the m × m identity matrix Im appears at least once as a row of V. Permuted graph matrices can be used in some contexts in place of orthogonal matrices, for instance when giving a basis for a subspace μ ⊆ cm+nor to normalize matrix pencils in a suitable sense. In these applications the permuted graph matrix can be chosen with bounded entries, which is useful for stability reasons; several algorithms can be formulated with numerical advantage with permuted graph matrices.We present the basic theory and review some applications from optimization or in control theory. © Springer International Publishing Switzerland 2015
Counterexamples to the Complement Problem
No full textWe provide explicit counterexamples to the so-called Complement Problem in every dimension n≥3 , i.e. pairs of non-isomorphic irreducible hypersurfaces H₁ ,H₂ ⊂C n whose complements C n ∖H 1 and C n ∖H 2 are isomorphic. Since we can arrange that one of the hypersurfaces is singular whereas the other is smooth, we also have counterexamples in the analytic setting
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