bluuebunny/crossref_metadata_2025_split huggingface dataset:
A natural-stone city walk through Maastricht, the Netherlands
Authors: Dubelaar C.W. , Kisters P.J.M. , Stroucken J.W. 
Published: July 2016

AbstractHaving been inspired by the leaflet, ‘Natuursteen in Maastricht. Aardrijkskunde in een oude stad’, written by P.J. Felder and published in 1977, we here present descriptions of the main types of natural stones applied in the city of Maastricht. A concise overview of the provenance area, mineralogy and physical properties of a selection of so-called historical building stones used in Maastricht, from Roman times onwards, is given. On a walk, starting at the Natuurhistorisch Museum Maastricht and ending at the Vrijthof, the main square of the city of Maastricht, details of building stones seen on the way are highlighted.
The origin of ‘tauw’, an enigmatic building stone of the Mergelland: a case study of the Hesbaye region, southwest of Maastricht (Belgium)
Authors: Dusar M. , Dreesen R. , Indeherberge L. , Defour E. , Meuris R. 
Published: July 2016

AbstractThe origin of a peculiar type of silicified limestone with nodular flints used in parish churches at Sluizen and Vreren, south of Tongeren (province of Limburg, Belgium), has now been elucidated by the discovery of the same rock type in its natural setting, namely the silicified top of the Cretaceous which underlies Clay-with-flints (‘flint eluvium’) and Oligocene sands in a disused quarry at Elst, municipality of Riemst (Limburg, Belgium). Co-operation between professional geologists and amateur palaeontologists has allowed to characterise this rock type, here referred to as ‘Elst tauw’, both petrographically and palaeontologically. The rich echinoid fauna has also been assessed, on the basis of a comparison with assemblages from the Clay-with-flints at Halembaye (Haccourt/Lixhe, province of Liège, Belgium) and at Zichen-Eben Emael in the Hesbaye region. P.J. Felder's ecozones, based on bioclast assemblages, substantiated by analyses of petrographical biofacies features of the original calcarenite, has allowed lithostratigraphic correlation of the ‘Elst tauw’ with the ‘Roosburg block’, which is a variety of ‘Maastricht stone’. Both methods indicate that the ‘Elst tauw’ developed in beds that can be assigned to the condensed Valkenburg-Schiepersberg interval of the lower Maastricht Formation. Petrographical analysis has shown the ‘Elst tauw’ to be quite distinctive; in addition, its natural occurrence at the Elst quarry matches the building stone records in rock type. The latter stem from the same small area, situated southwest of Maastricht. The major steps in its diagenetic history could be reconstructed, starting with pervasive pyritisation of the calcareous allochems, followed by silicification of the grains and pore spaces (different silica cements that became partially recrystallised), completed by oxidation of pyrite with transformation into limonite and, finally, dissolution of the non-pyritised or partially pyritised skeletal allochems creating a mouldic porosity. Silicification probably was achieved prior to the Oligocene. This particular mode of formation has generated a discussion on the proper use of the vernacular term ‘tauw’, a term used in a different sense by the industry, stratigraphers and students of building stones.
Late Pleistocene variations of the background aeolian dust concentration in the Carpathian Basin: an estimate using decomposition of grain-size distribution curves of loess deposits
Authors: Varga G. , Kovács J. , Újvári G. 
Published: July 2016

AbstractAeolian dust deposits can be considered as one of the most important archives of past climatic changes. Alternating loess and paleosol strata display variations of the dust load in the Pleistocene atmosphere. By using the observations of recent dust storms, we are able to employ Late Pleistocene stratigraphic datasets (with accurate chronological framework) and detailed granulometric data for making conclusions on the atmospheric dust load in the past. Age-depths models, created from the absolute age data and stratigraphic interpretation, allow us to calculate sedimentation rates and dust fluxes, while grain-size specifies the dry-deposition velocity, i.e. the atmospheric residence time of mineral particles. Thus, the dust concentration can be expressed as the quotient of the dust flux and gravitational settling velocity. Recent observations helped to clarify the mechanisms behind aeolian sedimentation and the physical background of this process has nowadays been well established. Based on these two, main contrasting sedimentary modes of dust transport and deposition can be recognised: the short suspension episodes of the coarse (silt and very fine sand) fraction and the long-range transport of a fine (clay and fine silt) component. Using parametric curve fitting the basic statistical properties of these two sediment populations can be revealed for Pleistocene aeolian dust deposits, as it has been done for loess in Hungary. As we do not have adequate information on the magnitude and frequency of the Pleistocene dust storms, conclusions could only be made on the magnitude of continuous background dust load. The dust concentration can be set in the range between 1100 and 2750 μg/m3. These values are mostly higher than modern dust concentrations, even in arid regions. Another interesting proxy of past atmospheric conditions could be the visibility, being proportional to the dust concentration. According to the known empirical dust concentration – visibility equations, its value is around 6.5 to 26 kilometres.
Loess in the Vojvodina region (Northern Serbia): an essential link between European and Asian Pleistocene environments
Authors: Marković S.B. , Hambach U. , Stevens T. , Jovanović M. , O'Hara-Dhand K. , Basarin B. , Lu H. , Smalley I. , Buggle B. , Zech M. , Svirčev Z. , Sümegi P. , Milojković N. , Zöller L. 
Published: July 2016

AbstractLoess deposits in the Vojvodina region, northern Serbia, are among the oldest and most complete loess-paleosol sequences in Europe to date. These thick sequences contain a detailed paleoclimatic record from the late Early Pleistocene. Based on the correlation of detailed magnetic susceptibility (MS) records from Vojvodina with the Chinese loess record and deep-sea isotope stratigraphy we here reconfirm and expand on a stratigraphic model of the Vojvodinian loess-paleosol chronostratigraphic sequence following the Chinese loess stratigraphic system.Variations in MS, dust accumulation rates, and the intensity of pedogenesis demonstrate evidence for a Middle Pleistocene climatic and environmental transition. The onset of loess deposition in Vojvodina also indicates a direct link between dust generation in Europe and that in the interior of Eurasia since the Early Pleistocene. The youngest part of the Early Pleistocene and oldest part of the Middle Pleistocene is characterised by relatively uniform dust accumulation and soil formation rates as well as relatively high magnetic susceptibility values. In contrast, the last five interglacial-glacial cycles are characterised by sharp environmental differences between high dust accumulation rates during the glacials and low rates observed during soil development. The data presented in this study demonstrate the great potential of Vovjodina's loess archives for accurate reconstruction of continental Eurasian Pleistocene climatic and environmental evolution.
Soft rock pediments in South Moravia, Czech Republic
Authors: Czudek T. 
Published: July 2016

AbstractSoft rock pediments developed in South Moravia in some places as early as the Tertiary, in other places as late as the Pleistocene. Depending on local environmental factors the pediments developed either due to backwearing or downwearing. The most suitable conditions for the evolution of the Pleistocene pediments were during transitional periods between warm and cold climate phases and especially during periglacial conditions between cold and warm periods in the Middle and Late Pleistocene. In agricultural landscapes, the studied relief features continue to develop also at present.
The role of permafrost in shaping the Late Glacial relief of northern Poland
Authors: van Loon A.J. , Błaszkiewicz M. , Degórski M. 
Published: July 2016

AbstractThe presence of permafrost in Poland north of the line indicating the maximum ice extent of the Vistulian (Weichselian) glaciation after retreat of the land-ice cap has been a subject of debate for a long time. Investigations in an area at the line of the maximum ice extent of the Pomeranian phase prove that permafrost existed, indeed, after the ice retreat. This conclusion is drawn on the basis of morphological data (the presence of oriented kettle holes), sedimentological data (the nature of the infilling of the kettle holes) and pedological data (permafrost-affected horizons in soil profiles). It appears that the permafrost mostly developed in the ice-free zone that appeared after the retreat of the land-ice cap, but it is likely that some relict permafrost that had originated earlier in front of advancing ice was also still present. The landscape of northern Poland owes its relief partly to the Late Glacial permafrost.
Earth Sciences and Economics, a productive and dynamic interface awaiting exploration
Authors: Vermaat J.E. , Bokhorst M. 
Published: July 2016

AbstractThis paper sketches the historical common grounds of economics and earth sciences from their roots as scientific disciplines in the period of Enlightenment, and from a much earlier not necessarily scientifical commonality in the economic dependency of early societies on the prevalence of natural resources on the surface of the earth. It proceeds by stressing the commonality of the two disciplines in being empirical and positivistically mechanistic, without ignoring the major socio-cultural rift that occurs between their respective practitioners. The argument is put forward that societal problems, whether global or local, are often not straightforward and easily solved with the tools of a single discipline, and a plea is made for the combination of earth sciences and economics as candidates for a potent multi-disciplinary combination. Briefly, the BSc curriculum in Earth Sciences and Economics is justified and an accompanying research agenda is highlighted that starts from an empirical quantification of ecosystem services at the landscape scale of catchments.
Tympanoplasty: does dry or wet temporalis fascia graft matter?
Authors: Singh G B , Kumar D , Aggarwal K , Garg S , Arora R , Kumar S 
Published: July 2016

AbstractObjectives:To evaluate the success rate of dry and wet temporalis fascia grafts in type I underlay tympanoplasty.Methods:A prospective, randomised study was conducted. One hundred adult patients (males and females) with chronic suppurative otitis media (mucosal type) were divided into 2 groups of 50 each: one group underwent dry graft tympanoplasty and the other underwent wet graft tympanoplasty. Fibroblast count was calculated in dry and wet grafts.Results:The dry graft and wet graft groups had overall surgical success rates of 82 and 90 per cent, respectively; this finding was not statistically significant. A statistically significant high fibroblast count was observed in wet grafts, but it did not correlate with surgical success.Conclusion:A dry or wet temporalis fascia graft does not influence the outcome of tympanoplasty type I.
On the equivalence problem and integration of differential systems
Authors: Higa Tatsuo 
Published: July 2016

The purpose of the presnet paper is to study the relationship between the theory of Lie pseudogroups and the problem of integration of differential systems (cf. [6] pp. 30-47).Let be a Lie pseudogroup on a manifold M and S a differentia] system on M. Let (S) denote the largest subpseudogroup of leaving S invariant. Then the problems to be considered may be stated as follows.
Universal induced characters and restriction rules for the classical groups
Authors: Teranishi Yasuo 
Published: July 2016

The purpose of this paper is the study of some basic properties of universal induced characters and their applications to the representation theory of the classical groups (for the definition of a universal induced character, see § 3).The starting point was the paper [F] by E. Formanek on matrix invariants. In his paper [F], Formanek has investigated the Hilbert series for the ring of matrix invariants from the point of view of the representation theory of the general linear group and the symmetric group. In this paper we shall study polynomial concomitants of a group from the same point of view.
Sur les Espaces Homogènes Kählériens d’un Groupe de Lie Réductif
Authors: Matsushima Yozô 
Published: July 2016

La recherche de la structure des espaces homogènes kählériens d’un groupe de Lie semi-simple fait l’objet de plusieurs travaux récents. L’étude détaillée a été faite au cas compact. Il a été montré en particulier que ces espaces homogènes compacts sont des variétés algébriques (même rationnelles) et simplement connexes.Le but essentiel de ce travail est de montrer que tout espace homogène kählérien compact est produit direct d’un tore complexe et d’un espace homogène kählérien d’un groupe de Lie compact semi-simple (Théorème 3). Pour ce but nous étudierons au paragraphe 1 la structure des espaces homogènes symplectiques d’un groupe de Lie réductif. La structure et la situation du groupe d’isotropie seront clarifiées dans le théorème 1. Au paragraphe 2 on en déduit un théorème sur la structure des espaces homogènes kählériens d’un groupe de Lie réductif (Théorème 2). Le théorème 3 est une conséquence immédiate du théorème 2.
Note on P.P. Rings: (A Supplement to Hattori’s Paper)
Authors: Endo Shizuo 
Published: July 2016

A ring R is called, according to [2], a left p.p. ring if any principal left ideal of R is projective. A ring which is left and right p.p. is called a p.p. ring.In this short note we shall give some additional remarks to A. Hattori [2]. In Proposition 1 we shall give a characterization of commutative p.p. rings, and in Proposition 3 we shall give a generalization of Proposition 17 and 18 in [2], which shows also that the modified torsion theory over commutative p.p. rings coincides with the usual torsion theory.
Ito’s formula and Levy’s Laplacian
Authors: Saito Kimiaki 
Published: July 2016

The class of normal functionalsis, as is well known, adapted to the domain of Lévy’s Laplacian and plays important roles in the works by P. Lévy and T. Hida (cf. [1], [2] and [8]), where Bx denotes one-dimensional parameter white noise and denotes the renormalization of
Discriminants in the invariant theory of reflection groups
Authors: Orlik Peter , Solomon Louis 
Published: July 2016

Let V be a complex vector space of dimension l and let G ⊂ GL(V) be a finite reflection group. Let S be the C-algebra of polynomial functions on V with its usual G-module structure (gf)(v) = f{g-1v). Let R be the subalgebra of G-invariant polynomials. By Chevalley’s theorem there exists a set ℬ = {f1, …, fl} of homogeneous polynomials such that R = C[f1, …, fl]. We call ℬ a set of basic invariants or a basic set for G. The degrees di = deg fi are uniquely determined by G. We agree to number them so that d1 ≤ … ≤ di. The map τ: V/G → C1 defined byis a bijection. Each reflection in G fixes some hyperplane in V.
Torsion points on elliptic curves defined over quadratic fields
Authors: Kenku M. A. , Momose F. 
Published: July 2016

Letkbe a quadratic field andEan elliptic curve defined overk. The authors [8, 12, 13] [23] discussed thek-rational points onEof prime power order. For a prime numberp, letn=n(k, p) be the least non negative integer such thatfor all elliptic curvesEdefined over a quadratic fieldk([15]).
On ε-approximate singularities of autonomous systems of vortex type
Authors: Omoto Hideo , Kimura Yoshifumi 
Published: July 2016

Let us consider three vortex-filaments zj(t) with strength Γj (j = 1, 2, 3) in the complex plane C. Then the system of motion equations is given byThis system (E) is defined on V = C3 = Δ, where Δ = {(z1 z2, z3) ∈ C3; Zj = zk for j ≠ k} is the super-diagonal set of C3.
A generalization of Kita and Noumi’s vanishing theorems of cohomology groups of local system
Authors: Cho Koji 
Published: July 2016

AbstractWe prove vanishing theorems of cohomology groups of local system, which generalize Kita and Noumi’s result and partially Aomoto’s result. Main ingredients of our proof are the Hodge to de Rham spectral sequence and Serre’s vanishing theorem in algebraic geometry.
Lp (1 ≤ p ≤ ∞) estimates for on a certain pseudoconvex domain in ℂn
Authors: Adachi Kenzō , Cho Hong Rae 
Published: July 2016

AbstractLet Ψ ∈ C2[0,1] be a positive real valued function on (0, 1]. Under certain assumptions on Ψ, the set is a pseudoconvex domain with C2-boundary which may be infinite type. If Ψ has flatness at 0 so that then we can obtain Lp(1 ≤ p ≤ ∞) estimates for on D.
Componentwise linear ideals
Authors: Herzog Jürgen , Hibi Takayuki 
Published: July 2016

AbstractA componentwise linear ideal is a graded ideal I of a polynomial ring such that, for each degreeq, the ideal generated by all homogeneous polynomials of degreeqbelonging toIhas a linear resolution. Examples of componentwise linear ideals include stable monomial ideals and Gotzmann ideals. The graded Betti numbers of a componentwise linear ideal can be determined by the graded Betti numbers of its components. Combinatorics on squarefree componentwise linear ideals will be especially studied. It turns out that the Stanley-Reisner idealIΔarising from a simplicial complex Δ is componentwise linear if and only if the Alexander dual of Δ is sequentially Cohen-Macaulay. This result generalizes the theorem by Eagon and Reiner which says that the Stanley-Reisner ideal of a simplicial complex has a linear resolution if and only if its Alexander dual is Cohen-Macaulay.
Multiple zeta values, poly-Bernoulli numbers, and related zeta functions
Authors: Arakawa Tsuneo , Kaneko Masanobu 
Published: July 2016

AbstractWe study the functionand show that the poly-Bernoulli numbers introduced in our previous paper are expressed as special values at negative arguments of certain combinations of these functions. As a consequence of our study, we obtain a series of relations among multiple zeta values.
Nonexistence of real analytic Levi flat hypersurfaces in ℙ2
Authors: Ohsawa Takeo 
Published: July 2016

AbstractA real hypersurface M in a complex manifold X is said to be Levi flat if it separates X locally into two Stein pieces. It is proved that there exist no real analytic Levi flat hypersurfaces in ℙ2.
Asymptotic expansions of double zeta-functions of Barnes, of Shintani, and Eisenstein series
Authors: Matsumoto Kohji 
Published: July 2016

AbstractThe present paper contains three main results. The first is asymptotic expansions of Barnes double zeta-functions, and as a corollary, asymptotic expansions of holomorphic Eisenstein series follow. The second is asymptotic expansions of Shintani double zeta-functions, and the third is the analytic continuation of n-variable multiple zeta-functions (or generalized Euler-Zagier sums). The basic technique of proving those results is the method of using the Mellin-Barnes type of integrals.
Hilbert-Kunz Multiplicity of Three-Dimensional Local Rings
Authors: Watanabe Kei-ichi , Yoshida Ken-ichi 
Published: July 2016

In this paper, we investigate the lower bound sHK(p, d) of Hilbert-Kunz multiplicities for non-regular unmixed local rings of Krull dimension d containing a field of characteristic p > 0. Especially, we focus on three-dimensional local rings. In fact, as a main result, we will prove that sHK (p, 3) = 4/3 and that a three-dimensional complete local ring of Hilbert-Kunz multiplicity 4/3 is isomorphic to the non-degenerate quadric hypersurface k[[X, Y, Z,W]]/(X2 + Y2 + Z2 + W2) under mild conditions.Furthermore, we pose a generalization of the main theorem to the case of dim A ≥ 4 as a conjecture, and show that it is also true in case dim A = 4 using the similar method as in the proof of the main theorem.
The Dependence of Capacities on moving Branch points
Authors: Nakai Mitsuru 
Published: July 2016

AbstractWe are concerned with the question how the capacity of the ideal boundary of a subsurface of a covering Riemann surface over a Riemann surface varies according to the variation of its branch points. In the present paper we treat the most primitive but fundamental situation that the covering surface is a two sheeted sphere with two branch points one of which is fixed and the other is moving and the subsurface is given as the complement of two disjoint continua each in different sheets of the covering surface whose projections are two disjoint continua in the base plane given in advance not touching the projections of branch points. We will derive a variational formula for the capacity and as one of its many useful consequences expected we will show that the capacity changes smoothly as one branch point moves in the subsurface.
On Canonical Modules of Toric Face Rings
Authors: Ichim Bogdan , Römer Tim 
Published: July 2016

AbstractGeneralizing the concepts of Stanley-Reisner and affine monoid algebras, one can associate to a rational pointed fan Σ in ℝd the ℤd-graded toric face ring K[Σ]. Assuming that K[Σ] is Cohen-Macaulay, the main result of this paper is to characterize the situation when its canonical module is isomorphic to a ℤd-graded ideal of K[Σ]. From this result several algebraic and combinatorial consequences are deduced. As an application, we give a relation between the cleanness of K[Σ] and the shellability of Σ.
Commuting Families in Hecke and Temperley-Lieb Algebras
Authors: Halverson Tom , Mazzocco Manuela , Ram Arun 
Published: July 2016

AbstractWe define analogs of the Jucys-Murphy elements for the affine Temperley-Lieb algebra and give their explicit expansion in terms of the basis of planar Brauer diagrams. These Jucys-Murphy elements are a family of commuting elements in the affine Temperley-Lieb algebra, and we compute their eigenvalues on the generic irreducible representations. We show that they come from Jucys-Murphy elements in the affine Hecke algebra of type A, which in turn come from the Casimir element of the quantum group. We also give the explicit specializations of these results to the finite Temperley-Lieb algebra.
Hilbert-Samuel polynomials for the contravariant extension functor
Authors: Crabbe Andrew , Katz Daniel , Striuli Janet , Theodorescu Emanoil 
Published: July 2016

AbstractLet(R,m)be a local ring, and letMandNbe finiteR-modules. In this paper we give a formula for the degree of the polynomial giving the lengths of the modules ExtiR(M,N/mnN). A number of corollaries are given, and more general filtrations are also considered.
Module structure of cells in unequal-parameter Hecke algebras
Authors: Pietraho Thomas 
Published: July 2016

AbstractA conjecture of Bonnafé, Geck, Iancu, and Lam parametrizes Kazhdan-Lusztig left cells for unequal-parameter Hecke algebras in typeBnby families of standard domino tableaux of arbitrary rank. Relying on a family of properties outlined by Lusztig and the recent work of Bonnafé, we verify the conjecture and describe the structure of each cell as a module for the underlying Weyl group.
On Everywhere Dense Imbedding of Free Groups in Lie Groups
Authors: Kuranishi Masatake 
Published: July 2016

In this note it will be proved that some kinds of Lie groups (including semi-simple Lie groups) have an everywhere dense subgroup which is algebraically isomorphic to the free group generated by two elements (Theorem 8),In § 1 characterizations of Lie groups which are approximated by discrete subgroups’ are given. This section is closely connected with a part of the results of Malcev [4] and Matsushima [5], and some theorems are slight modifications of them (Theorems 2 and 3).