34 research outputs found
Direct measurement of vorticity using tracer particles with internal markers
Current experiment techniques for vorticity measurement suffer from limited
spatial and temporal resolution to resolve the small-scale eddy dynamics in
turbulence. In this study, we develop a new method for direct vorticity
measurement in fluid flows based on digital inline holography (DIH). The DIH
system utilizes a collimated laser beam to illuminate the tracers with internal
markers and a digital sensor to record the generated holograms. The tracers
made of the polydimethylsiloxane (PDMS) prepolymer mixed with internal markers
are fabricated using a standard microfluidic droplet generator. A rotation
measurement algorithm is developed based on the 3D location reconstruction and
tracking of the internal markers and is assessed through synthetic holograms to
identify the optimal parameter settings and measurement range (e.g., rotation
rate from 0.3 to 0.7 rad/frame under numerical aperture of imaging of 0.25).
Our proposed method based on DIH is evaluated by a calibration experiment of
single tracer rotation, which yields the same optimal measurement range. Using
von K\'arm\'an swirling flow setup, we further demonstrate the capability of
the approach to simultaneously measure the Lagrangian rotation and translation
of multiple tracers. Our method can measure vorticity in a small region on the
order of 100 m or less and can be potentially used to quantify the
Kolmogorov-scale vorticity field in turbulent flows.Comment: 17 pages, 7 figure
DGraph: A Large-Scale Financial Dataset for Graph Anomaly Detection
Graph Anomaly Detection (GAD) has recently become a hot research spot due to
its practicability and theoretical value. Since GAD emphasizes the application
and the rarity of anomalous samples, enriching the varieties of its datasets is
a fundamental work. Thus, this paper present DGraph, a real-world dynamic graph
in the finance domain. DGraph overcomes many limitations of current GAD
datasets. It contains about 3M nodes, 4M dynamic edges, and 1M ground-truth
nodes. We provide a comprehensive observation of DGraph, revealing that
anomalous nodes and normal nodes generally have different structures, neighbor
distribution, and temporal dynamics. Moreover, it suggests that those unlabeled
nodes are also essential for detecting fraudsters. Furthermore, we conduct
extensive experiments on DGraph. Observation and experiments demonstrate that
DGraph is propulsive to advance GAD research and enable in-depth exploration of
anomalous nodes.Comment: 9 page
When to Pre-Train Graph Neural Networks? An Answer from Data Generation Perspective!
Recently, graph pre-training has attracted wide research attention, which
aims to learn transferable knowledge from unlabeled graph data so as to improve
downstream performance. Despite these recent attempts, the negative transfer is
a major issue when applying graph pre-trained models to downstream tasks.
Existing works made great efforts on the issue of what to pre-train and how to
pre-train by designing a number of graph pre-training and fine-tuning
strategies. However, there are indeed cases where no matter how advanced the
strategy is, the "pre-train and fine-tune" paradigm still cannot achieve clear
benefits. This paper introduces a generic framework W2PGNN to answer the
crucial question of when to pre-train (i.e., in what situations could we take
advantage of graph pre-training) before performing effortful pre-training or
fine-tuning. We start from a new perspective to explore the complex generative
mechanisms from the pre-training data to downstream data. In particular, W2PGNN
first fits the pre-training data into graphon bases, each element of graphon
basis (i.e., a graphon) identifies a fundamental transferable pattern shared by
a collection of pre-training graphs. All convex combinations of graphon bases
give rise to a generator space, from which graphs generated form the solution
space for those downstream data that can benefit from pre-training. In this
manner, the feasibility of pre-training can be quantified as the generation
probability of the downstream data from any generator in the generator space.
W2PGNN provides three broad applications, including providing the application
scope of graph pre-trained models, quantifying the feasibility of performing
pre-training, and helping select pre-training data to enhance downstream
performance. We give a theoretically sound solution for the first application
and extensive empirical justifications for the latter two applications
Armeniacae semen amarum: a review on its botany, phytochemistry, pharmacology, clinical application, toxicology and pharmacokinetics
Armeniacae semen amarum—seeds of Prunus armeniaca L. (Rosaceae) (ASA), also known as Kuxingren in Chinese, is a traditional Chinese herbal drug commonly used for lung disease and intestinal disorders. It has long been used to treat coughs and asthma, as well as to lubricate the colon and reduce constipation. ASA refers to the dried ripe seed of diverse species of Rosaceae and contains a variety of phytochemical components, including glycosides, organic acids, amino acids, flavonoids, terpenes, phytosterols, phenylpropanoids, and other components. Extensive data shows that ASA exhibits various pharmacological activities, such as anticancer activity, anti-oxidation, antimicrobial activity, anti-inflammation, protection of cardiovascular, neural, respiratory and digestive systems, antidiabetic effects, and protection of the liver and kidney, and other activities. In clinical practice, ASA can be used as a single drug or in combination with other traditional Chinese medicines, forming ASA-containing formulas, to treat various afflictions. However, it is important to consider the potential adverse reactions and pharmacokinetic properties of ASA during its clinical use. Overall, with various bioactive components, diversified pharmacological actions and potent efficacies, ASA is a promising drug that merits in-depth study on its functional mechanisms to facilitate its clinical application
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Female directors and CSR: does the presence of female directors affect CSR focus?
This study examines the impact of female directors on CSR by drawing on social role theory and literature about female leadership style. Using a sample of Chinese firms from 2007 to 2021, we show a strong correlation between female directors and an enhancement in aggregate and particularly, internal CSR engagement. The relationship between female director and external CSR is negative but not significant. Further analysis reveals that in regions with stronger societal expectations towards females, the contributions of female directors to CSR activities become more pronounced. Our findings further demonstrate that a critical mass of female directors on the board is necessary to exert substantial influence on internal CSR initiatives. Notably, we find that female directors in independent and monitoring roles particularly effective in advancing internal CSR initiatives
Comparison of Outcomes of Colorectal Polypectomy Using Traditional Snare and Rotary Snare: A Prospective Randomized Controlled Trial
Topography, Diversity, and Forest Structure Attributes Drive Aboveground Carbon Storage in Different Forest Types in Northeast China
Forests regulate air quality and respond to climate change by storing carbon. Assessing the driving factors of forest aboveground carbon (AGC) storage is of great importance for forest management. We assumed that different forest types would affect the relationship between species richness, stand density, individual tree size variation, and AGC. In order to test and verify it, we analyzed the inventory data of 206 fixed plots (20 m × 20 m) of Jingouling Forest Farm, taking advantage of the piecewise structural equation model (pSEM) to explore the effects of species diversity, stand structure attributes, and topography on the AGC storage in the Wangqing Forest in Jilin Province. In addition, in this study, we aimed to investigate whether the fixed factors (species diversity, stand structure attributes, and topography) influenced AGC storage more significantly than the random factor (forest type). According to the results of pSEM, the selected factors jointly explain the impact on 33% of AGC storage. The relationship between stand density and AGC is positive, and the impact of individual tree size variation on AGC storage is negative. Species richness has direct and indirect impacts on AGC storage, and the indirect impact is more significant through individual tree size variation. Both elevation and slope are significantly negatively associated with AGC storage. Forest type explains the impact on 12% of AGC storage, which means the relationship between AGC and predictors varies across forest types. The results provide a scientific basis for the protection and management decision of natural forests in northeastern China