7,866 research outputs found
Does engaging in government initiated corporate social responsibility activities improve corporate innovation? Evidence from China
The Chinese government initiated a nationwide poverty alleviation
campaign in 2016. Many Chinese listed firms engaged in
poverty alleviation campaign and made significant contributions.
In this study, we investigate the relationship between firms’ poverty
alleviation campaign and firm innovation performance. Using
a large sample of 3140 Chinese A-share listed firms on Shenzhen
and Shanghai Stock Exchange from 2016 to 2019, this study demonstrates
that firms’ poverty alleviation campaign contribute to
the improvement of firm innovation performance. These results
are more pronounced for firms with higher internet search volume.
Overall, our findings provide important support for listed
firms to engage in CSR activities initiated by governmen
Wavelength dependencies of the Kerr rotation and ellipticity for the magneto-optical recording media
Here we present wavelength dependence measurements of Co/Pd and Co/Pt superlattice samples with different compositions. We explore the relationship between the composition and the magneto-optical spectra. The induced magnetization in the Pt of Co/Pt or in the Pd of Co/Pd samples plays an important role in the magneto-optical activity, and is discussed for the samples measured. The experimental set-up and the samples used are described. The measurement results of one Co/Pt sample and a series of Co/Pd samples are discussed
Probing and Interaction at LHC
Many new physics models predict the existence of TeV-scale charged gauge
boson together with Higgs boson(s). We study the
interaction and explore the angular distribution of charged lepton to
distinguish from in process at the LHC. It is found that a new type forward-backward
asymmetry() relating to the angle between the direction of the charged
lepton in rest frame and that of the reconstructed in laboratory
frame is useful to investigate the properties of interaction. We
analyze the Standard Model backgrounds and develop a set of cuts to highlight
the signal and suppress the backgrounds at LHC. We find that can reach
0.03(-0.07) for () production at TeV
Graphene-based spintronic components
A major challenge of spintronics is in generating, controlling and detecting
spin-polarized current. Manipulation of spin-polarized current, in particular,
is difficult. We demonstrate here, based on calculated transport properties of
graphene nanoribbons, that nearly +-100% spin-polarized current can be
generated in zigzag graphene nanoribbons (ZGNRs) and tuned by a source-drain
voltage in the bipolar spin diode, in addition to magnetic configurations of
the electrodes. This unusual transport property is attributed to the intrinsic
transmission selection rule of the spin subbands near the Fermi level in ZGNRs.
The simultaneous control of spin current by the bias voltage and the magnetic
configurations of the electrodes provides an opportunity to implement a whole
range of spintronics devices. We propose theoretical designs for a complete set
of basic spintronic devices, including bipolar spin diode, transistor and logic
gates, based on ZGNRs.Comment: 14 pages, 4 figure
Cross-Subject Emotion Recognition with Sparsely-Labeled Peripheral Physiological Data Using SHAP-Explained Tree Ensembles
There are still many challenges of emotion recognition using physiological
data despite the substantial progress made recently. In this paper, we
attempted to address two major challenges. First, in order to deal with the
sparsely-labeled physiological data, we first decomposed the raw physiological
data using signal spectrum analysis, based on which we extracted both
complexity and energy features. Such a procedure helped reduce noise and
improve feature extraction effectiveness. Second, in order to improve the
explainability of the machine learning models in emotion recognition with
physiological data, we proposed Light Gradient Boosting Machine (LightGBM) and
SHapley Additive exPlanations (SHAP) for emotion prediction and model
explanation, respectively. The LightGBM model outperformed the eXtreme Gradient
Boosting (XGBoost) model on the public Database for Emotion Analysis using
Physiological signals (DEAP) with f1-scores of 0.814, 0.823, and 0.860 for
binary classification of valence, arousal, and liking, respectively, with
cross-subject validation using eight peripheral physiological signals.
Furthermore, the SHAP model was able to identify the most important features in
emotion recognition, and revealed the relationships between the predictor
variables and the response variables in terms of their main effects and
interaction effects. Therefore, the results of the proposed model not only had
good performance using peripheral physiological data, but also gave more
insights into the underlying mechanisms in recognizing emotions
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