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Université de Neuchâtel

Distinct element method simulation of an analogue for a highly interlocked, non-persistently jointed rockmass

Bahrani, N ; Kaiser, P.K ; Valley, Benoît

In: International Journal of Rock Mechanics & Mining Sciences, 2014, vol. 71, p. 117-130

A grain-based distinct element model is used to reproduce the laboratory response of both intact and granulated Wombeyan marble. The term “granulated” refers to a heat treated marble where the cohesion of grain boundaries has been destroyed. The unconfined compressive strength granulated marble is less than 50% of that of intact marble, while the strength of the granulated marble increases to...

Université de Neuchâtel

Stochastic simulation of channelized sedimentary bodies using a constrained L-system

Rongier, G ; Collon, P ; Renard, Philippe

In: Computers & Geosciences, 2017, vol. 105, p. 158-168

Simulating realistic sedimentary bodies while conditioning all the available data is a major topic of research. We present a new method to simulate the channel morphologies resulting from the deposition processes. It relies on a formal grammar system, the Lindenmayer system, or L-system. The L-system puts together channel segments based on user-defined rules and parameters. The succession of...

Université de Neuchâtel

From Asia to Europe : evaluation of parasitoids for the biological control of the invasive fruit pest "Drosophila suzukii"

Girod, Pierre ; Turlings, Ted (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

La production agricole est en constante évolution afin d’améliorer le rendement. Actuellement, 40% de la production agricole est perdue à cause des ravageurs des cultures (majoritairement des insectes exotiques). Leur contrôle est une des priorités majeures à laquelle les chercheurs font face aujourd’hui. Le commerce international et le changement climatique ont accéléré la...

Université de Neuchâtel

Advances in characterizing surface water-groundwater interactions : combining unconventional data with complex, fully-integrated models

Schilling, Oliver S. ; Brunner, Philip (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Caractériser et simuler les interactions entre les eaux de surface et souterraines s’avère être un enjeu de plus en plus important afin de garantir une eau de qualité pour des puits de pompage situés à proximité d’une rivière. Grâce à la dernière génération de modèles numériques physiques intégrant les écoulements de surface et souterrains, il est maintenant possible de...

Université de Neuchâtel

Isolation and characterization of oxalotrophic bacteria from tropical soils

Bravo, Daniel ; Braissant, Olivier ; Cailleau, Guillaume ; Verrecchia, Eric ; Junier, Pilar

In: Archives of Microbiology, 2015, vol. 197, no. 1, p. 65-77

The oxalate–carbonate pathway (OCP) is a biogeochemical set of reactions that involves the conversion of atmospheric CO2 fixed by plants into biomass and, after the biological recycling of calcium oxalate by fungi and bacteria, into calcium carbonate in terrestrial environments. Oxalotrophic bacteria are a key element of this process because of their ability to oxidize calcium...

Université de Neuchâtel

Human impact erodes chimpanzee behavioral diversity

Kühl, Hjalmar S ; Boesch, Christophe ; Kulik, Lars ; Haas, Fabien ; Arandjelovic, Mimi ; Dieguez, Paula ; Bocksberger, Gaëlle ; McElreath, Mary Brooke ; Agbor, Anthony ; Angedakin, Samuel ; Ayimisin, Emmanuel Ayuk ; Bailey, Emma ; Barubiyo, Donatienne ; Bessone, Mattia ; Brazzola, Gregory ; Chancellor, Rebecca ; Cohen, Heather ; Coupland, Charlotte ; Danquah, Emmanuel ; Deschner, Tobias ; Dowd, Dervla ; Dunn, Andrew ; Egbe, Villard Ebot ; Eshuis, Henk ; Goedmakers, Annemarie ; Granjon, Anne-Céline ; Head, Josephine ; Hedwig, Daniela ; Hermans, Veerle ; Imong, Inaoyom ; Jeffery, Kathryn J ; Jones, Sorrel ; Junker, Jessica ; Kadam, Parag ; Kambere, Mbangi ; Kambi, Mohamed ; Kienast, Ivonne ; Kujirakwinja, Deo ; Langergraber, Kevin E ; Lapuente, Juan ; Larson, Bradley ; Lee, Kevin ; Leinert, Vera ; Llana, Manuel ; Maretti, Giovanna ; Marrocoli, Sergio ; Martin, Rumen ; Mbi, Tanyi Julius ; Meier, Amelia C ; Morgan, Bethan ; Morgan, David ; Mulindahabi, Felix ; Murai, Mizuki ; Neil, Emily ; Niyigaba, Protais ; Ormsby, Lucy Jayne ; Orume, Robinson ; Pacheco, Liliana ; Piel, Alex ; Preece, Jodie ; Regnaut, Sebastien ; Rundus, Aaron ; Sanz, Crickette ; Schijndel, Joost van ; Sommer, Volker ; Stewart, Fiona ; Tagg, Nikki ; Vendras, Elleni ; Vergnes, Virginie ; Welsh, Adam ; Wessling, Erin G ; Willie, Jacob ; Wittig, Roman M ; Ginath Yuh, Yisa ; Yurkiw, Kyle ; Zuberbühler, Klaus ; Kalan, Ammie K

In: Science, 2019, vol. 363, no. 6434, p. 1453-1455

Chimpanzees possess a large number of behavioral and cultural traits among nonhuman species. The “disturbance hypothesis” predicts that human impact depletes resources and disrupts social learning processes necessary for behavioral and cultural transmission. We used a dataset of 144 chimpanzee communities, with information on 31 behaviors, to show that chimpanzees inhabiting areas with high...

Accès public à partir du 1 mars 2020
Université de Neuchâtel

Impact of microwave-field inhomogeneity in an alkali vapour cell using Ramsey double-resonance spectroscopy

Moreno, William ; Pellaton, Matthieu ; Affolderbach, Christoph ; Almat, Nil ; Gruet, Florian ; Mileti, Gaetano

In: Quantum Electronics, 2019, vol. 49, no. 3, p. 293-297

We numerically and experimentally evaluate the impact of the inhomogeneity of the microwave field in the cavity used to perform double-resonance (DR) Ramsey spectroscopy in a buffer gas alkali vapour cell. The Ramsey spectrum is numerically simulated using a simple theoretical model and taking into account the field distribution in a magnetron-type microwave resonator. An experimental evaluation...

Université de Neuchâtel

Statistical metrics for the characterization of karst network geometry and topology

Collon, P ; Bernasconi, D ; Vuilleumier, C ; Renard, Philippe

In: Geomorphology, 2017, vol. 283, p. 122-142

Statistical metrics can be used to analyse the morphology of natural or simulated karst systems; they allow describing, comparing, and quantifying their geometry and topology. In this paper, we present and discuss a set of such metrics. We study their properties and their usefulness based on a set of more than 30 karstic networks mapped by speleologists. The data set includes some of the largest...

Université de Neuchâtel

On the use of multiple-point statistics to improve groundwater flow modeling in karst aquifers : A case study from the Hydrogeological Experimental Site of Poitiers, France

Le Coz, M ; Bodin, J ; Renard, Philippe

In: Journal of Hydrology, 2017, vol. 545, p. 109-119

Limestone aquifers often exhibit complex groundwater flow behaviors resulting from depositional heterogeneities and post-lithification fracturing and karstification. In this study, multiple-point statistics (MPS) was applied to reproduce karst features and to improve groundwater flow modeling. For this purpose, MPS realizations were used in a numerical flow model to simulate the responses to...

Accès public à partir du 23 mai 2019
Université de Neuchâtel

Long-term effects of deep-seated landslides on transportation infrastructure : a case study from the Swiss Jura Mountains

Preisig, Giona

In: Quarterly Journal of Engineering Geology and Hydrogeology, 2018, vol. 2017, p. 128-137

Deep-seated landslides (DSLs) involve large-scale deformation and likely affect transportation infrastructure. Movement rates are in general very slow (less than a metre per year) with acceleration periods controlled by external factors such as the seasonal fluctuation of groundwater pressure. Acceleration response may change from season to season depending on hydrogeological conditions, changes...