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Université de Fribourg

Temporal mapping of photochemical reactions and molecular excited states with carbon specificity

Wang, K. ; Murahari, P. ; Yokoyama, K. ; Lord, J. S. ; Pratt, F. L. ; He, J. ; Schulz, Leander ; Willis, M. ; Anthony, J. E. ; Morley, N. A. ; Nuccio, Laura ; Misquitta, A. ; Dunstan, D. J. ; Shimomura, K. ; Watanabe, I. ; Zhang, S. ; Heathcote, P. ; Drew, Alan J.

In: Nature Materials, 2017, vol. 16, no. 4, p. 467–473

Photochemical reactions are essential to a large number of important industrial and biological processes. A method for monitoring photochemical reaction kinetics and the dynamics of molecular excitations with spatial resolution within the active molecule would allow a rigorous exploration of the pathway and mechanism of photophysical and photochemical processes. Here we demonstrate that...

Université de Fribourg

Separate density and viscosity measurements of unknown liquid using quartz crystal microbalance

Tan, Feng ; Qiu, Du-Yu ; Guo, Lian-Ping ; Ye, Peng ; Zeng, Hao ; Jiang, Jun ; Tang, Yong ; Zhang, Yi-Cheng

In: AIP Advances, 2016, vol. 6, no. 9, p. 095313

Aqueous liquids have a wide range of applications in many fields. Basic physical properties like the density and the viscosity have great impacts on the functionalities of a given ionic liquid. For the millions kinds of existing liquids, only a few have been systematically measured with the density and the viscosity using traditional methods. However, these methods are limited to measure the...

Université de Fribourg

Recovery rate affects the effective epidemic threshold with synchronous updating

Shu, Panpan ; Wang, Wei ; Tang, Ming ; Zhao, Pengcheng ; Zhang, Yi-Cheng

In: Chaos: An Interdisciplinary Journal of Nonlinear Science, 2016, vol. 26, no. 6, p. 63108

Accurate identification of effective epidemic threshold is essential for understanding epidemic dynamics on complex networks. In this paper, we systematically study how the recovery rate affects the susceptible-infected-removed spreading dynamics on complex networks, where synchronous and asynchronous updating processes are taken into account. We derive the theoretical effective epidemic...

Université de Fribourg

Enhancing speed of pinning synchronizability: low-degree nodes with high feedback gains

Zhou, Ming-Yang ; Zhuo, Zhao ; Liao, Hao ; Fu, Zhong-Qian ; Cai, Shi-Min

In: Scientific Reports, 2015, vol. 5, p. 17459

Controlling complex networks is of paramount importance in science and engineering. Despite recent efforts to improve controllability and synchronous strength, little attention has been paid to the speed of pinning synchronizability (rate of convergence in pinning control) and the corresponding pinning node selection. To address this issue, we propose a hypothesis to restrict the control cost,...

Université de Fribourg

Dynamics of social contagions with limited contact capacity

Wang, Wei ; Shu, Panpan ; Zhu, Yu-Xiao ; Tang, Ming ; Zhang, Yi-Cheng

In: Chaos: An Interdisciplinary Journal of Nonlinear Science, 2015, vol. 25, no. 10, p. 103102

Individuals are always limited by some inelastic resources, such as time and energy, which restrict them to dedicate to social interaction and limit their contact capacities. Contact capacity plays an important role in dynamics of social contagions, which so far has eluded theoretical analysis. In this paper, we first propose a non-Markovian model to understand the effects of contact capacity on...

Université de Fribourg

Muonium avoided level crossing measurement of electron spin relaxation rate in a series of substituted anthradithiophene based molecules

Han, S. ; Wang, K. ; Willis, M. ; Nuccio, Laura ; Pratt, F.L. ; Lord, J.S. ; Thorley, K.J. ; Anthony, J. ; Drew, A.J. ; Zhang, S. ; Schulz, Leander

In: Synthetic Metals, 2015, vol. 208, p. 39–42

Muon spin spectroscopy and in particular the avoided level crossing technique is introduced, with the aim of showing it as a very sensitive local probe for electron spin relaxation in organic semiconductors. Avoided level crossing data on tert-butyl-ethynyl anthradithiophene, tri-methyl-silyl-ethynyl anthradithiophene and tri-ethygermyl-ethynyl anthradithiophene at different temperatures are...

Université de Fribourg

Predicting missing links via correlation between nodes

Liao, Hao ; Zeng, An ; Zhang, Yi-Cheng

In: Physica A: Statistical Mechanics and its Applications, 2015, vol. 436, p. 216–223

As a fundamental problem in many different fields, link prediction aims to estimate the likelihood of an existing link between two nodes based on the observed information. Since this problem is related to many applications ranging from uncovering missing data to predicting the evolution of networks, link prediction has been intensively investigated recently and many methods have been proposed so...

Université de Fribourg

Reconstructing propagation networks with temporal similarity

Liao, Hao ; Zeng, An

In: Scientific Reports, 2015, vol. 5, p. 11404

Node similarity significantly contributes to the growth of real networks. In this paper, based on the observed epidemic spreading results we apply the node similarity metrics to reconstruct the underlying networks hosting the propagation. We find that the reconstruction accuracy of the similarity metrics is strongly influenced by the infection rate of the spreading process. Moreover, there is a...

Université de Fribourg

The auxin transporter, OsAUX1, is involved in primary root and root hair elongation and in Cd stress responses in rice (Oryza sativa L.)

Yu, ChenLiang ; Sun, ChenDong ; Shen, Chenjia ; Wang, Suikang ; Liu, Fang ; Liu, Yan ; Chen, YunLong ; Li, Chuanyou ; Qian, Qian ; Aryal, Bibek ; Geisler, Markus ; Jiang, De An ; Qi, YanHua

In: The Plant Journal, 2015, vol. 83, no. 5, p. 818–830

Auxin and cadmium (Cd) stress play critical roles during root development. There are only a few reports on the mechanisms by which Cd stress influences auxin homeostasis and affects primary root (PR) and lateral root (LR) development, and almost nothing is known about how auxin and Cd interfere with root hair (RH) development. Here, we characterize rice osaux1 mutants that have a longer PR and...