1,338 research outputs found
Graphlet and Orbit Computation on Heterogeneous Graphs
Many applications, ranging from natural to social sciences, rely on graphlet
analysis for the intuitive and meaningful characterization of networks
employing micro-level structures as building blocks. However, it has not been
thoroughly explored in heterogeneous graphs, which comprise various types of
nodes and edges. Finding graphlets and orbits for heterogeneous graphs is
difficult because of the heterogeneity and abundance of semantic information.
We consider heterogeneous graphs, which can be treated as colored graphs. By
applying the canonical label technique, we determine the graph isomorphism
problem with multiple states on nodes and edges. With minimal parameters, we
build all non-isomorphic graphs and associated orbits. We provide a Python
package that can be used to generate orbits for colored directed graphs and
determine the frequency of orbit occurrence. Finally, we provide four examples
to illustrate the use of the Python package.Comment: 13 pages, 7 figure
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Wafer-Scale Si-Based Metal−Insulator−Semiconductor Photoanodes for Water Oxidation Fabricated Using Thin Film Reactions and Multiple-layer Electrodeposited Catalysts
Solar-driven photoelectrochemical (PEC) water
splitting offers a promising and environmentally friendly route for
the conversion of renewable solar energy to hydrogen gas. A
crystalline Si absorber is especially attractive due to its moderate
bandgap, high charge mobility, long carrier diffusion length, costeffectiveness,
and scalability in manufacturing. To improve the
stability of Si-based PEC cells in operation, metal−insulator−
semiconductor (MIS) structures have been widely employed. In
this work, we employ simple and highly scalable processes to
fabricate high-performance, extremely stable Si-based MIS photoanodes,
and demonstrate their application to the fabrication of
wafer-scale photoanodes. Localized conduction paths formed via an
Al/SiO2 thin-film reaction enable low-resistance charge extraction
even through thick insulating layers, yielding photoanodes with excellent stability. To improve the efficiency, we demonstrate a twostep
Ni/NiFe electrodeposition process to create efficient oxygen evolution reaction catalysts. The Ni/NiFe catalyst allows for a high
Schottky barrier between Si and Ni, lowering the photoanode onset potential, while the NiFe surface layer improves the catalytic
performance. An unassisted solar-driven water splitting system incorporating a wafer-scale photoanode and monocrystalline Si solar
cells is demonstrated and yields a solar-to-hydrogen conversion efficiency of 6.9% under simulated AM 1.5G sunlight illumination.This research was primarily supported by the National Science
Foundation (grant CBET-2109842). The authors acknowledge
the use of the facilities and instrumentation supported by
Texas Materials Institute, and by the National Science
Foundation through the Center for Dynamics and Control of
Materials: an NSF MRSEC under Cooperative Agreement nos.
DMR-1720595 and DMR-2308817. This work was performed
in part at the University of Texas Microelectronics Research
Center, a member of the National Nanotechnology Coordinated
Infrastructure (NNCI), which is supported by the
National Science Foundation (grant ECCS-2025227).Center for Dynamics and Control of Material
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Performance Enhancing Drugs: History, Medical Effects & Policy
The goal of this paper is to serve as a general treatise on the vast topic of use of performance enhancing drugs in athletic competition. It begins by laying out the extensive history of doping in sports, from the ancient Romans to the East German Olympic swim team to the steroids scandal in baseball. The paper moves on to describe and discuss the many medical effects that use of performance enhancing drugs might trigger. The paper concludes by discussing the appropriateness of anti-doping policy in general by analyzing and scrutinizing the general strands of arguments that are used to support bans on doping. While many rationales are rejected, a few are ultimately accepted and they justify the implementation of anti-doping policies
Comorbid Mental Disorders in Anxiety Disorders: Genetic Aspects of Bipolar Disorders and of Ethnicity
Anxiety disorder (AD) is commonly comorbid with other mental illness. It could be a state or trait, controversially. Evidence for an association between alcoholism and anxiety has emerged from clinical studies of patients with alcoholism, and those of patients with anxiety disorders. Alcohol dependence (or abuse) as well as bipolar disorder (BP) is usually comorbid with anxiety disorder and/or depressive disorder, which often coexist and are difficult to distinguish from one another. However, in Han Chinese population, the comorbidity rate either with alcoholism or bipolar disorder was not reported as much high as reported in Caucasians, this finding of comorbidity between anxiety/depressive disorders and alcohol dependence (or abuse) or/and bipolar disorders, possibly at the genetic level, makes the differentiation of their categorical diagnoses in the association study vitally important
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