bluuebunny/crossref_metadata_2025_split huggingface dataset:
Magnetotelluric sounding in the Western Transbaikalia segment of the Central Asian fold belt
Authors: Pospeeva E.V. , Potapov V.V. , Vitte L.V. 
Published: February 2017

Abstract
This paper presents the results of magnetotelluric (MT) studies performed within the Western Transbaikalia segment of the Central Asian fold belt along the Selenga River delta–Krasnyi Chikoi Village profile. The data are interpreted using the results of recent geological, petrological, geothermal, tectonic, and geochronological studies of the Mongolia-Transbaikalian part of the Central Asian fold belt, including large heterochronous igneous provinces and zones. The studies have shown that the investigated area has a complex geologic and tectonic structure produced by extensive rifting leading to the formation of large crustal blocks and by intense magmatic fluid activity along deep fault zones. The investigated profile is characterized by a combination of blocks with different types of geoelectric section—mountain ranges and intermontane basins separated by long-lived deep fault zones.
Stratigraphy and ecostratigraphic distribution of foraminiferal morphogroups from the Upper Jurassic of the Makar’yev section (Unzha River, Volga River basin)
Authors: Colpaert C. , Nikitenko B.L. , Khafaeva S.N. 
Published: February 2017

Abstract
Investigation of the Upper Callovian to Lower Kimmeridgian microfossils from the Makar’yev reference section (Unzha River, East European Platform) has been carried out. The section is characterized by ammonite debris and abundant associations of benthic and planktic foraminifers. It is a perfect object for stratigraphic and paleoecological researches. The biostratigraphic distribution of foraminifers from the Makar’yev section allows one to identify standard foraminifera zones of the East European Platform, as well as to upgrade some of them. The analysis of vertical and lateral ammonites and foraminiferal distribution, completed with lithostratigraphy, has precised the stratigraphic volume and position of boundaries of several lithological units.
An improved stratigraphic scheme for the Kostroma area of the Moscow Depression is proposed. Analysis of the composition, structure, and dynamic changes of the foraminiferal assemblages has been performed. The morphofunctional analysis of foraminiferal genera has for the first time identified how foraminiferal morphogroups differing in their life style and feeding strategy varied with short-term paleoenvironmental changes. These morphogroup changes allow establishing four ecostratigraphic levels. These paleoecological data have been calibrated along with geochemical factors. They have shown a crisis of foraminiferal association during the Late Oxfordian and Early Kimmeridgian. A similar crisis has also been discovered in the north of Siberia, which may be an argument for its global distribution. The analysis of the taxonomic composition and the density of foraminiferal associations, in parallel with the structure of the association, has revealed a succession of transgressive and regressive events during the Late Callovian–Early Kimmeridgian. It allows the typification of each assemblage in relation with each event and underlines the occurrence of second-order sea-level fluctuations (middle part of the Middle Oxfordian and the earliest Kimmeridgian).
Neotectonics and seismicity of Erzurum pull-apart basin, East Turkey
Authors: Koçyigit A. , Canoglu M.C. 
Published: February 2017

AbstractThe study area is the Erzurum pull-apart basin located in the East Anatolian Tectonic Block (EATB), which is under the control of a strike-slip neotectonic regime since the beginning of Quaternary. The Quaternary Erzurum pull-apart basin is an about 1–30 km wide, 90 km long and actively growing strike-slip depression. It is bounded by the Erzurum–Dumlu sinistral strike-slip fault zone to the east-southeast, by the Askale sinistral strike-slip fault zone to the north-northwest, and by the Basköy–Kandilli reverse fault zone and the N–S-trending Ilica oblique-slip normal fault set to the west. The Erzurum pull-apart basin was evolved by the deformation and subdivision of an E–W-trending older intermontane basin. The new basin has a 0.5 km thick, flat-lying (undeformed) and uconsolidated fill, which overlies, with an angular unconformitry, the deformed (folded and faulted) basement rocks of pre-Quaternary age. Basin fill consists of coarser-grained marginal facies (fault terrace, fan, fan-apron and superimposed fan deposits) and finer-grained depocentral facies represented by flood plain to organic material-rich marsh deposits. All gradations are seen among these lithofacies.The seismicity of the Erzurum pull-apart basin is quite high. The magnitude of the peak earthquake to be sourced from the active faults (e.g., the Erzurum fault) is about Mw = 7.0. This was proved by both the historical and recent earthquakes. Numerous settlements in the size of a large city (e.g., Erzurum), county, town and small villages with a total population of over 766,000 are located in and along the active fault-bounded margins of the Erzurum pull-apart basin. They are under the threat of destructive earthquakes to be sourced from the margin-boundary faults. Therefore, based on both the active fault parameters and the water-saturated basin fill, a large-scale earthquake hazard map has to be prepared. This map has to be used in both the earthquake hazard to risk analyses and the redesign of city planning and all type of constructions in Erzurum and other settlements in this region.
Age of the Jombolok lava field (East Sayan): evidence from dendrochronology and radiocarbon dating
Authors: Arzhannikov S.G. , Ivanov A.V. , Arzhannikova A.V. , Demonterova E.I. , Jolivet M. , Voronin V.I. , Buyantuev V.A. , Oskolkov V.A. 
Published: February 2017

Abstract
Dendrochronology and radiocarbon dating, with reference to remote sensing, digital elevation modeling, geological, and geomorphological data, provide new age constraints for the Jombolok lava field in the East Sayan Mountains (Siberia). The Jombolok lava field originated in the latest Late Pleistocene and underwent at least four phases of volcanic activity recorded in lava flows. Two earliest phases followed shortly one after another more than 13 kyr ago. The third phase corresponding to eruptions of Kropotkin volcano can be timed only relatively. The fourth phase has been dated by dendrochronology and AMS 14C of well-preserved wood buried under the youngest lava which occurs among older lavas near the Jombolok River mouth. The age of this activity is bracketed between the death of trees caused by eruptions 1268–928 years ago and the beginning of new tree growth on the surface of the most recent lavas 900 years ago.
The evolution of planets. Venus as the Earth’s probable future
Authors: Dobretsov N.L. 
Published: February 2017

Abstract
The general evolution of planets in the Solar System is discussed with a focus on the structure and history of Venus compared with the Earth. The history of the planets of the terrestrial group has been similar and included at least six correlated stages. Many common features the terrestrial planets shared in their early and late evolution have been due to their common origin from the protoplanetary gas-and-dust nebula and plume magmatism widespread on all the planets of the terrestrial group. The characteristic features of the structure and evolution of Venus are most brightly manifested in the specific composition of its atmosphere and of plume magmatism. Venus, with its surface as hot as 450 °C and the near-surface pressure of 92–93 bars, has a hot and dense atmosphere 93 times that of the Earth in mass. Most of its atmospheric mass (99%) belongs to the 65-km thick troposphere consisting of CO2 (96.5%) and N2 (3.5%). The upper troposphere includes a 25–30 km thick cloud layer composed mainly of sulfuric acid droplets, water vapor, and SO2. At a height of 49.58 km, the clouds approach the conditions of the terrestrial surface and might be hospitable to bacterial life. Volcanism, the most active and widespread process of Venusian geology, maintains continuous SO2 emission. There are diverse volcanic edifices on Venus, which are most often large and are similar to the Earth’s plume-related volcanoes. The evolution before 1 Ga, as well as the share and the role of alkaline rocks and carbonatites among its volcanics, are among the most debatable issues about Venus. Being located closer to the Sun, Venus cooled down more slowly and less intensely than the Earth after the primary accretion. In the Proterozoic, it began heating and reached its present state at ~ 1 or 2 Ga. In the future, as the Sun becomes a red giant, the Earth is predicted to begin heating up in 500–600 Myr to reach the temperature of present Venus in about 1.5 Gyr.
Integral representation of nonconvex functionals defined on measures
Authors: Bouchitté G. , Buttazzo G. 
Published: February 2017

We show that every functional which is defined on the space

\mathcal M(\Omega,\mathbf R^n)

of all

\mathbf R^n

valued measures with bounded variation on

Ω

, and which is local and sequentially weakly

\ast

lower semicontinuous, can be represented in a suitable integral form.

Résumé

Représentation intégrale de fonctionnelles nonconvexes définies sur des mesures
. – Une formule de représentation intégrale est établie pour toute fonctionnelle définie sur l’espace

\mathcal M(\Omega,\mathbf R^n)

des mesures boréliennes sur

Ω

à valeurs dans

\mathbf R^n

, qui est locale et séquentiellement semicontinue inférieurement pour la topologie

\ast

faible.
The nonrelativistic limit of the nonlinear Dirac equation
Authors: Najman B. 
Published: February 2017

It is proved that there exist solutions of the nonlinear Dirac equation, smooth in time, on a time interval which is independent of

c

. Moreover after multiplication by a phase factor (dependent on

c

) these solutions converge to the solution of a coupled system of nonlinear Schrödinger type equations.

Résumé

La limite non relativistique de l’équation de Dirac non linéaire
. − On montre qu’existent des solutions de l’équation de Dirac non linéaire, régulières en temps, sur un intervalle en temps indépendant de

c

. En plus, après la multiplication avec un facteur de phase (

c

-dépendant) ces solutions convergent vers la solution d’un système couplé d’équations du type Schrödinger non linéaire.
Extension de fonctions de type positif et entropie associée. Cas multidimensionnel
Authors: Seghier A. 
Published: February 2017

In an earlier note [7] we gave simple conditions which were sufficient for the effective reconstruction of spectral densities. Clearly the natural setting for these results is the problem of the extension of positive type in the multidimensionnal case [6]. Further analysis, in this framework, of the results mentionned above shows that they are applicable to the phase problem in cristallography. Illustrative examples of such extensions are given.

Résumé
Nous avons donné dans une précédente note [7] des conditions suffisantes simples pour la reconstruction effective de densités spectrales. Il s’avère que le cadre naturel de ces résultats est le problème de l’extension de fonctions de type positif dans le cadre multidimensionnel [6]. Une analyse plus poussée, dans ce cadre, des résultats mentionnés ci-dessus, montre qu’ils sont applicables au problème de phases en cristallographie.
Équation de la chaleur et réflections multiples
Authors: Perret C. , Witomski P. 
Published: February 2017

The model we are presenting here is a simplified version which arises from the numerical simulation of the crystal growth ([3], [6]). We are interested in the resolution of the heat equation in a domain

Ω

with thermal exchanges by radiation on a part

Γ_1

of the boundary of

Ω

. These exchanges exist inside a closed cavity

Γ = Γ_1 ∪ Γ_2

. If we take account of all the reflections we obtain a nonlinear Neumann’s condition with temperatures coupled on

Γ_1

. The method using here to prove the existence of a solution to this problem is based on the utilization of lower and upper solutions. We obtain the unicity by a maximum principle.

Résumé

Le modèle que nous présentons ici est une version simplifiée tirée de la simulation numérique d’un procédé de cristallogénèse ([3], [6]). On s’intéresse à la résolution de l’équation de la chaleur dans un domaine

Ω

avec des échanges thermiques par rayonnement sur une partie

Γ_1

de la frontière de

Ω

. Ces échanges se font à l’intérieur d’une enceinte fermée

Γ = Γ_1 ∪ Γ_2

. La prise en compte de toutes les réflections donne un couplage des températures et une condition de Neumann non linéaire sur

Γ_1

. Cette non linéarité n’est pas monotone. On utilise la méthode des sous et sur solutions pour montrer l’existence d’une solution minimale et d’une solution maximale puis on établit l’unicité de la solution avec un principe du maximum.
Classical solvability in dimension two of the second boundary-value problem associated with the Monge-Ampère operator
Authors: Delanoë P. 
Published: February 2017

Given two bounded strictly convex domains of

ℝ^n

and a positive function on their product, all data being smooth, find a smooth strictly convex function whose gradient maps one domain onto the other with Jacobian determinant proportional to the given function. We solve this problem under the (technical) condition

n = 2

.

Résumé

Soit deux domaines bornés strictement convexes de

ℝ^n

et une fonction positive définie sur leur produit, ces données étant lisses, trouver une fonction lisse strictement convexe dont le gradient applique un domaine sur l’autre avec déterminant Jacobien proportionnel à la fonction donnée. Nous résolvons ce problème sous la condition (technique)

n = 2

.
Ljusternik-Schnirelman theory with local Palais-Smale condition and singular dynamical systems
Authors: Majer P. 
Published: February 2017

We find infintely many T-periodic solutions to a system

ü + ∇_x V(t, u) = 0

with a singular, T-periodic potential

V

, whose behaviour at infinity is subjected to rather weak assumptions. In order to do so, we adapt the Ljusternik–Schnirelman method to handle a functional possibly unbounded from below and which possibly does not satisfy the Palais–Smale condition at any level.

Résumé

Nous trouvons un nombre infini de solutions T-périodiques d’un système

ü + ∇_xV(t, u) = 0

pour un potentiel singulier, T-périodique

V

dont le comportement à l’infini est sujet à des hypothèses très faibles. Pour ce faire, nous adaptons la méthode de Ljusternik–Schnirelman pour traiter une fonctionnelle même non bornée inférieurement et ne satisfaisant pas la condition de Palais–Smale à tout niveau.
Heteroclinic orbits for spatially periodic Hamiltonian systems
Authors: Felmer P.L. 
Published: February 2017

We study the existence of heteroclinic orbits for a Hamiltonian system

\begin{align*}
&\.{p} = −\mathrm{H}_{q}(p,q) \\
&\.{q} = \mathrm{H}_{p}(p,q)
\end{align*}

where the Hamiltonian is periodic in the space variable

q

and superlinear in

p

. We use the Saddle Point Theorem to obtain existence of solutions for a finite time interval, and then we obtain heteroclinic orbits as limit of them. Our hypothesis on

\mathrm H

are motivated by the second order Lagrangean systems on the torus.

Résumé
On étudie l’existence des orbites hétérocliniques pour le système hamiltonien

\begin{align*}
&\.{p} = −\mathrm{H}_{q}(p,q) \\
&\.{q} = \mathrm{H}_{p}(p,q)
\end{align*}

quand l’Hamiltonien est périodique par rapport à la variable

q

et superlinéaire en

p

. On utilise le théorème de Point Selle pour obtenir des solutions dans un intervalle de temps fini et on obtient donc les orbites hétérocliniques comme limites. Les hypothèses qu’on utilise sur

\mathrm H

sont motivées par les systèmes Lagrangiens sur le torus.
A system of non-linear functional differential equations arising in an equilibrium model of an economy with borrowing constraints
Authors: Conze A. , Lasry J.-M. , Scheinkman J.A. 
Published: February 2017

We study the existence of solutions to a nonlinear functional differential system that describes the equilibrium of a dynamic stochastic economy with heterogeneous agents facing borowing constraints. Our model is a generalization of the one studied in Scheinkman and Weiss [3] to display the effect of borrowing constraints in aggregate economic activity, and the mathematical techniques that we developp can be useful to deal with more complex models.
The system has aspects of a free boundary value problem in which there are different equations for different domains, with the domains themselves and their boundary determined by the solutions. It also has some of the characteristics of hyperbolic systems that one would obtain by differentiating Hamilton–Jacobi equations. These aspects combine to require, at least apparently, a very specific new approach to the existence problem. One payoff of this technique is that the existence proof is also an algorithm for computation.

Résumé
On étudie l’existence de solutions d’un système différentiel fonctionnel non linéaire décrivant l’équilibre d’une économie stochastique dynamique avec des agents hétérogènes soumis à des contraintes d’endettement. Notre modèle est une généralisation de celui étudié par Scheinkman et Weiss [3] qui mettait en valeur les effets de contraintes d’endettement sur l’activité économique agrégée, et sa résolution introduit des techniques mathématiques utilies pour la résolution de modèles plus complexes.
Le système possède certains aspects d’un problème avec frontière libre pour lequel il y a des équations différentes pour différents domaines, les domaines et leur frontière étant déterminés par les solutions. Il possède également certaines des caractéristiques des systèmes hyperboliques obtenu par différentiation d’équations de Hamilton–Jacobi. La combinaison de ces aspects nécessite une approche spécifique du problème d’existence. L’un des avantages de cette technique est que la preuve d’existence fournit un algorithme de calcul des solutions.
An explanation for the phase lag in supersonic jet impingement
Authors: Weightman Joel L. , Amili Omid , Honnery Damon , Soria Julio , Edgington-Mitchell Daniel 
Published: February 2017

For the first time, a physical mechanism is identified to explain the phase lag term in Powell’s impinging feedback loop equation (Powell, J. Acoust. Soc. Am., vol. 83 (2), 1988, pp. 515–533). Ultra-high-speed schlieren reveals a previously unseen periodic transient shock in the wall jet region of underexpanded impinging flows. The motion of this shock appears to be responsible for the production of the acoustic waves corresponding to the impingement tone. It is suggested that the delay between the inception of the shock and the formation of the acoustic wave explains the phase lag in the aeroacoustic feedback process. This suggestion is quantitatively supported through an assessment of Powell’s feedback equation, using high-resolution particle image velocimetry and acoustic measurements.
Archaeological heritage management in the Meuse valley (Limburg, the Netherlands) from a national perspective: aims, methods and results
Authors: Rensink Eelco 
Published: February 2017

AbstractNumerous archaeological investigations have been performed along the river Meuse in the Netherlands’ southeastern province of Limburg as part of the major ‘Maaswerken’ infrastructural project. To improve flood risk management and navigability, and for the purpose of gravel production and nature development, several areas of land covering a total of almost 2000 ha are being excavated to a great depth. In anticipation of this, archaeological research was performed for the purposes of recording and documenting archaeological remains in the most important areas and locations. From 1998 to 2015 the Cultural Heritage Agency of the Netherlands (Amersfoort) was in charge of the investigations, and acted as adviser to national public works agency Rijkswaterstaat.The archaeological research connected with the Maaswerken project differed from regular, site-based investigations in terms of the landscape archaeology perspective on which it was based. The research themes and principles associated with this perspective were published in several documents, including a scientific policy plan published in 2004, and presented in further detail in area programmes and project briefs. The policy plan assigned each project area to one of five value assessment categories, based on the intactness of the landscape and the archaeological potential for addressing the research questions. In areas of high landscape intactness and great archaeological potential (category 1) the Agency selected zones to be surveyed and assessed, and for archaeological excavation. Though most of the fieldwork, including specialist analysis, was performed in these zones, other category project areas have also been the subject of archaeological fieldwork, including borehole surveys, site-oriented research and watching briefs, but on a more incidental basis. Observations were also made in the river Meuse itself and in the river's winter bed.The archaeological investigations resulted in a large number of standard reports of desk studies and fieldwork, including reports of specialist analyses. A considerable proportion of these refer to the large-scale investigations at Borgharen and Itteren to the north of Maastricht, and at Lomm and Well–Aijen to the north of Venlo. The results of the investigations suggest the archaeological record here is rich and varied, with a time depth of c. 11,500 years, and traces of occupation and land use ranging from the Early Mesolithic (Well–Aijen, Borgharen) to the Second World War (Lomm).This paper reflects on almost 20 years of archaeological research in the project areas of the Maaswerken and on the principles and methods used in the field research. The common thread is the results of landscape and archaeological studies and the relationship between them. Examples are used to illustrate results that can be regarded as important from a national perspective, and in terms of archaeological heritage management.