1,784 research outputs found
Grouting in Consideration of Predominant Direction of Joints in Rock Masses
We conducted a grouting test in rock mass having steep joints with predominant direction, assuming blanket grouting for embankment dams. Vertical holes and inclined holes designed in consideration of the predominant direction of the joints were used as grouting holes, and the hole spacing was determined such that the number of grouting holes per unit area on a joint was the same for both cases. As a result, both tests saw a similar improvement despite the fact that the test using inclined holes had wider hole spacing than the test using vertical holes on the ground surface. We can also reduce the total drilling length of grouting holes if we use inclined holes instead of vertical holes, the hole spacing of which is determined in this manner, and thus we have demonstrated the usefulness of grouting that considers the predominant direction of joints in rock mass
Efficient Hydrogen Production by a Photoredox Cascade Catalyst Comprising Dual Photosensitizers and a Transparent Electron Mediator
One-directional electron transport between a photocatalyst and redox mediator is crucial for achieving highly active Z-scheme water-splitting photocatalysis. Herein, a photoredox cascade catalyst that artificially mimics the electron transport chain in natural photosynthesis was synthesized from a Pt-TiO2 nanoparticle catalyst, two photosensitizers (RuCP6 and RuP6), and a visiblelight-transparent electron mediator (HCRu). During photocatalytic hydrogen evolution in the presence of a redox-reversible electron donor, [Co(bpy)3]2+ (bpy = 2,2 '-bipyridine), the HCRu-Zr-RuCP6-Zr-RuP6@Pt-TiO2 (PRCC-1) photocatalyst exhibited the highest reported initial (1 h) apparent quantum yield (iAQY = 2.23%) of dye-sensitized TiO2 photocatalysts to date. Furthermore, PRCC-1 successfully produced hydrogen when using hydroquinone monosulfonate (H2QS-) as the hydrogen source
Deep Learning-Based Average Consensus
In this study, we analyzed the problem of accelerating the linear average
consensus algorithm for complex networks. We propose a data-driven approach to
tuning the weights of temporal (i.e., time-varying) networks using deep
learning techniques. Given a finite-time window, the proposed approach first
unfolds the linear average consensus protocol to obtain a feedforward
signal-flow graph, which is regarded as a neural network. The edge weights of
the obtained neural network are then trained using standard deep learning
techniques to minimize consensus error over a given finite-time window. Through
this training process, we obtain a set of optimized time-varying weights, which
yield faster consensus for a complex network. We also demonstrate that the
proposed approach can be extended for infinite-time window problems. Numerical
experiments revealed that our approach can achieve a significantly smaller
consensus error compared to baseline strategies
Constructing Goeritz matrix from Dehn coloring matrix
Associated to a knot diagram, Goeritz introduced an integral matrix, which is
now called a Goeritz matrix. It was shown by Traldi that the solution space of
the equations with Goeritz matrix (precisely, unreduced Goeritz matrix called
in his paper) as a coefficient matrix is isomorphic to the linear space
consisting of the Dehn colorings for a knot. In this paper, we give a
construction of a Goeritz matrix from a Dehn coloring matrix, from which Dehn
colorings are induced. Moreover, if the knot diagram is prime, we give a purely
algebraic construction of a Goeritz matrix from a Dehn coloring matrix.Comment: 10 pages, 6 figure
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