427 research outputs found
Reaching Out and Beyond: Making Library Centered Connections
This poster is presented at the 2012 American Library Association Annual Conference in the Anaheim Convention Center. The hub on campus, academic libraries play a significant role in promoting diversity and academic success. Library resources and services have a great impact on university’s recruitment, retention and graduation. This poster session discusses some innovative practices in outreach, effective support in student learning, diverse models in services, and successful approaches in connecting with the campus community
A deep learning method for solving high-order nonlinear soliton equation
We propose effective scheme of deep learning method for high-order nonlinear
soliton equation and compare the activation function for high-order soliton
equation. The neural network approximates the solution of the equation under
the conditions of differential operator, initial condition and boundary
condition. We apply this method to high-order nonlinear soliton equation, and
verify its efficiency by solving the fourth-order Boussinesq equation and the
fifth-order Korteweg de Vries equation. The results show that deep learning
method can solve the high-order nonlinear soliton equation and reveal the
interaction between solitons
Dynamics similarity design and verification of rotor system
In order to study the dynamics similarity of original model similar to normal model, the similarity criteria and the similarity ratio of the normal and original models for the rotor system were derived by the dimension analysis method. ANSYS was used to numerically calculate the critical speeds, modal shapes and harmonic response of the original and normal models of rotor system. The analysis results show that, for the rotor system, the dynamic characteristics of the normal and original models satisfy the requirement of the similarity criteria perfectly. The dynamic characteristics of the original model can be predicted accurately by the corresponding normal model
Photonic Floquet time crystals
The public and scientists constantly have different perspectives. While on a
time crystal, they stand in line and ask: What is a time crystal? Show me a
material that is spontaneously crystalline in time? This study synthesizes a
photonic material of Floquet time crystals and experimentally observes its
indicative period-2T beating. We explicitly reconstruct a discrete
time-crystalline ground state and reveal using an appropriately-designed
photonic Floquet simulator the rigid period-doubling as a signature of the
spontaneous breakage of the discrete time-translational symmetry. Unlike the
result of the exquisite many-body interaction, the photonic time crystal is
derived from a single-particle topological phase that can be extensively
accessed by many pertinent nonequilibrium and periodically-driven platforms.
Our observation will drive theoretical and technological interests toward
condensed matter physics and topological photonics, and demystify time crystals
for the non-scientific public.Comment: 39 pages, 5 figures, supplementary materials, 6 suppl. figure
Interfacing Nickel Nitride and Nickel Boosts Both Electrocatalytic Hydrogen Evolution and Oxidation Reactions
Electrocatalysts of the hydrogen evolution and oxidation reactions (HER and HOR) are of critical importance for the realization of future hydrogen economy. In order to make electrocatalysts economically competitive for large-scale applications, increasing attention has been devoted to developing noble metal-free HER and HOR electrocatalysts especially for alkaline electrolytes due to the promise of emerging hydroxide exchange membrane fuel cells. Herein, we report that interface engineering of Ni3N and Ni results in a unique Ni3N/Ni electrocatalyst which exhibits exceptional HER/HOR activities in aqueous electrolytes. A systematic electrochemical study was carried out to investigate the superior hydrogen electrochemistry catalyzed by Ni3N/Ni, including nearly zero overpotential of catalytic onset, robust long-term durability, unity Faradaic efficiency, and excellent CO tolerance. Density functional theory computations were performed to aid the understanding of the electrochemical results and suggested that the real active sites are located at the interface between Ni3N and Ni
Interfacing Nickel Nitride and Nickel Boosts Both Electrocatalytic Hydrogen Evolution and Oxidation Reactions
Electrocatalysts of the hydrogen evolution and oxidation reactions (HER and HOR) are of critical importance for the realization of future hydrogen economy. In order to make electrocatalysts economically competitive for large-scale applications, increasing attention has been devoted to developing noble metal-free HER and HOR electrocatalysts especially for alkaline electrolytes due to the promise of emerging hydroxide exchange membrane fuel cells. Herein, we report that interface engineering of Ni3N and Ni results in a unique Ni3N/Ni electrocatalyst which exhibits exceptional HER/HOR activities in aqueous electrolytes. A systematic electrochemical study was carried out to investigate the superior hydrogen electrochemistry catalyzed by Ni3N/Ni, including nearly zero overpotential of catalytic onset, robust long-term durability, unity Faradaic efficiency, and excellent CO tolerance. Density functional theory computations were performed to aid the understanding of the electrochemical results and suggested that the real active sites are located at the interface between Ni3N and Ni
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