5,521 research outputs found
A combined analysis of PandaX, LUX, and XENON1T experiments within the framework of dark matter effective theory
Weakly interacting massive particles are a widely well-probed dark matter
candidate by the dark matter direct detection experiments. Theoretically, there
are a large number of ultraviolet completed models that consist of a weakly
interacting massive particle dark matter. The variety of models makes the
comparison with the direct detection data complicated and often non-trivial. To
overcome this, in the non-relativistic limit, the effective theory was
developed in the literature which works very well to significantly reduce the
complexity of dark matter-nucleon interactions and to better study the nuclear
response functions. In the effective theory framework for a spin-1/2 dark
matter, we combine three independent likelihood functions from the latest
PandaX, LUX, and XENON1T data, and give a joint limit on each effective
coupling. The astrophysical uncertainties of the dark matter distribution are
also included in the likelihood. We further discuss the isospin violating cases
of the interactions. Finally, for both dimension-five and dimension-six
effective theories above the electroweak scale, we give updated limits of the
new physics mass scales.Comment: 33 pages, 11 figures, PandaX run10 data included and version accepted
in JHEP, "code is available at the LikeDM website,
https://likedm.hepforge.org/
Post-Adoption Behaviors of E-Bookstore Customers
Although trade costs for both sellers and buyers can be reduced through the usage of e-commerce, however low transfer costs and global competition cause that the e-bookstores to have to maintain their customer loyalty is more difficult than traditional shopping stores. The formations of the customer loyalty of e-bookstores have been explored by many researchers from different points of view, such as service quality, satisfaction and trust. Nevertheless, the current bottleneck of e-commerce operation is that consumers are no longer continuing using e-bookstores. Based on the theory of Post-Acceptance Model, this study empirically tested using a field survey of e-bookstore customers. According to the deconstruction of online store environment, the factors of expectation-confirmation contain the confirmation of information contents, the confirmation of system platform and confirmation of web services quality. The results showed that satisfaction and perceived usefulness are significant predictors of continuance intention. The expectation-confirmation factors except the confirmation of system platform are significant predictor of satisfaction and perceived usefulness. The implications of these findings for e-bookstore continuance theory and practice are proposed in the final section
EFFECTS ON POSTURAL CONSTRAINTS ON OVERARM THROWING
This study explored the effects of postural constraints on overarm throwing. 10 participants were required to perform an overarm throwing movement by 3 tasks which under postural constraints. Tasks were including trunk-fixed, sitting, and standing. 10 pieces of 3D motion capture system were used to record the maximum velocity of body segments as data and one-way repeated measures ANOVA (a=.05) with HSD post-hoc tests was conducted to analysis the data. Therefore, the results indicated that the performance of overarm throwing by 3 tasks were different significantly, which proved the kinetic chain formed by links connected in series gave body segments more velocities. Moreover, it meat trunk and lower limbs played the roles to transport velocity as performing overarm throwing
Photoelastic Modulated Imaging Ellipsometry
Photoelastic modulator (PEM)-based ellipsometry employed either lock-in amplifiers or the Fourier analysis technique to obtain the ellipsometric parameters almost in real-time that makes the system with a feature of fast measurement speed, higher stability, and sensitivity at small retardations. Since the PEM modulation frequency is too high to compare it with the exposure time of the camera, photoelastic modulator–based approach is not applicable for a two-dimensional ellipsometric measurement. Here, we represent a novel technique that coordinates with the light pulses and PEM modulation that can freeze the time-varied signals. Thus, two-dimensional ellipsometric parameters can be obtained within few seconds. In addition to ellipsometric measurement, this approach also can be extended to other imaging polarimetry measurements, such as Stokes parameters and Mueller matrix. Moreover, since the chromatic dispersion of birefringence was also a significant issue in the polarization modulation systems, we proposed an equivalent phase retardation technique to deal with this issue. This technique was confirmed by a dual wavelength measurement result without changing the optical configuration of the system. The concept and the theory of this system were indicated in the preceding section, and the passage below described some calibration issues for the photoelastic modulator. Some measurement results were revealed in the final part of this chapter
SWITCHING THE HORIZONTAL GRF TO THE PATH OF PROGRESSION IN THE TABLE TENNIS FOREHAND DRIVE
Knowing the kinetic strategies of the lower limbs is a crucial factor to investigate the forehand drive which comprises the changes of the foot placement. It is difficult to directly evaluate the movement of feet with the data of ground reaction force (GRF) and impulse (GRI).This study tried to analyze table tennis forehand drives via the GRF and GRI data based upon the anatomical perspective. The motion and the GRF data were collected from eight right-handed Taiwanese elite table tennis players. The horizontal GRF data were transformed to a reference frame and then integrated with time to get the GRI. During the forehand drive shot, the participants performed a greater lateral impulse to cause the trunk rotation and decelerated their body from initial to mid-phase and then accelerated the body to perform a forehand drive shot
Associations among systemic blood pressure, microalbuminuria and albuminuria in dogs affected with pituitary- and adrenal-dependent hyperadrenocorticism
<p>Abstract</p> <p>Background</p> <p>Hypertension and proteinuria are medical complications associated with the multisystemic effects of long-term hypercortisolism in dogs with hyperadrenocorticism (HAC).</p> <p>Methods</p> <p>This study investigated the relationships among adrenocorticotropic hormone (ACTH)-stimulation test results, systemic blood pressure, and microalbuminuria in clinically-healthy dogs (n = 100), in dogs affected with naturally occurring pituitary-dependent (PDH; n = 40), or adrenal-dependent hyperadrenocorticism (ADH; n = 30).</p> <p>Results</p> <p>Mean systemic blood pressure was similar between clinically healthy dogs and dogs with HAC (<it>p </it>= 0.803). However the incidence of hypertension was highest in dogs with ADH (<it>p = 0.017</it>), followed by dogs with PDH, with the lowest levels in clinically healthy dogs (<it>p = 0.019</it>). Presence of microalbuminuria and albuminuria in clinically healthy dogs and dogs affected with HAC was significantly different (<it>p </it>< 0.001); incidences of albuminuria followed the same pattern of hypertension; highest incidence in dogs with ADH, and lowest level in clinically healthy dogs; but microalbuminuria showed a different pattern: clinically healthy dogs had highest incidences and dogs with ADH had lowest incidence. The presence of albuminuria was not associated with blood pressure values, regardless of whether dogs were clinically healthy or affected with ADH or PDH (<it>p </it>= 0.306).</p> <p>Conclusions</p> <p>Higher incidence of hypertension and albuminuria, not microalbuminuria was seen in dogs affected with HAC compared to clinically healthy dogs; incidence of hypertension and albuminuria was significantly higher in dogs affected with ADH compared to PDH. However, presence of albuminuria was not correlated with systemic blood pressure.</p
ECG Signal Super-resolution by Considering Reconstruction and Cardiac Arrhythmias Classification Loss
With recent advances in deep learning algorithms, computer-assisted
healthcare services have rapidly grown, especially for those that combine with
mobile devices. Such a combination enables wearable and portable services for
continuous measurements and facilitates real-time disease alarm based on
physiological signals, e.g., cardiac arrhythmias (CAs) from electrocardiography
(ECG). However, long-term and continuous monitoring confronts challenges
arising from limitations of batteries, and the transmission bandwidth of
devices. Therefore, identifying an effective way to improve ECG data
transmission and storage efficiency has become an emerging topic. In this
study, we proposed a deep-learning-based ECG signal super-resolution framework
(termed ESRNet) to recover compressed ECG signals by considering the joint
effect of signal reconstruction and CA classification accuracies. In our
experiments, we downsampled the ECG signals from the CPSC 2018 dataset and
subsequently evaluated the super-resolution performance by both reconstruction
errors and classification accuracies. Experimental results showed that the
proposed ESRNet framework can well reconstruct ECG signals from the 10-times
compressed ones. Moreover, approximately half of the CA recognition accuracies
were maintained within the ECG signals recovered by the ESRNet. The promising
results confirm that the proposed ESRNet framework can be suitably used as a
front-end process to reconstruct compressed ECG signals in real-world CA
recognition scenarios
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