461 research outputs found
Ballistic Thermal Rectification in Asymmetric Three-Terminal Mesoscopic Dielectric Systems
By coupling the asymmetric three-terminal mesoscopic dielectric system with a
temperature probe, at low temperature, the ballistic heat flux flow through the
other two asymmetric terminals in the nonlinear response regime is studied
based on the Landauer formulation of transport theory. The thermal
rectification is attained at the quantum regime. It is a purely quantum effect
and is determined by the dependence of the ratio
on , the phonon's frequency.
Where and are respectively the
transmission coefficients from two asymmetric terminals to the temperature
probe, which are determined by the inelastic scattering of ballistic phonons in
the temperature probe. Our results are confirmed by extensive numerical
simulations.Comment: 10 pages, 4 figure
Magnetothermoelectric DC conductivities from holography models with hyperscaling factor in Lifshitz spacetime
We investigate an Einstein-Maxwell-Dilaton-Axion holographic model and obtain
two branches of a charged black hole solution with a dynamic exponent and a
hyperscaling violation factor when a magnetic field presents. The
magnetothermoelectric DC conductivities are then calculated in terms of horizon
data by means of holographic principle. We find that linear temperature
dependence resistivity and quadratic temperature dependence inverse Hall angle
can be achieved in our model. The well-known anomalous temperature scaling of
the Nernst signal and the Seebeck coefficient of cuprate strange metals are
also discussed.Comment: 1+23 pages, 4 figures, references adde
Tangible Web: An Interactive Immersion Virtual RealityCreativity System that Travels Across Reality
With the advancement of virtual reality (VR) technology, virtual displays
have become integral to how museums, galleries, and other tourist destinations
present their collections to the public. However, the current lack of immersion
in virtual reality displays limits the user's ability to experience and
appreciate its aesthetics. This paper presents a case study of a creative
approach taken by a tourist attraction venue in developing a physical network
system that allows visitors to enhance VR's aesthetic aspects based on
environmental parameters gathered by external sensors. Our system was
collaboratively developed through interviews and sessions with twelve
stakeholder groups interested in art and exhibitions. This paper demonstrates
how our technological advancements in interaction, immersion, and visual
attractiveness surpass those of earlier virtual display generations. Through
multimodal interaction, we aim to encourage innovation on the Web and create
more visually appealing and engaging virtual displays. It is hoped that the
greater online art community will gain fresh insight into how people interact
with virtual worlds as a result of this work.Comment: Accepted In Proceedings of the ACM Web Conference 2023, April 30-May
4, 2023, Austin, TX, USA. ACM, New York, NY, US
Age Differences of Salivary Alpha-Amylase Levels of Basal and Acute Responses to Citric Acid Stimulation Between Chinese Children and Adults
It remains unclear how salivary alpha-amylase (sAA) levels respond to mechanical stimuli in different age groups. In addition, the role played by the sAA gene (AMY1) copy number and protein expression (glycosylated and non-glycosylated) in sAA activity has also been rarely reported. In this study, we analyzed saliva samples collected before and after citric acid stimulation from 47 child and 47 adult Chinese subjects. We observed that adults had higher sAA activity and sAA glycosylated levels (glycosylated sAA amount/total sAA amount) in basal and stimulated saliva when compared with children, while no differences were found in total or glycosylated sAA amount between them. Interestingly, adults showed attenuated sAA activity levels increase over those of children after stimulation. Correlation analysis showed that total sAA amount, glycosylated sAA amount, and AMY1 copy number×total sAA amount were all positively correlated with sAA activity before and after stimulation in both groups. Interestingly, correlation r between sAA levels (glycosylated sAA amount and total sAA amount) and sAA activity decreased after stimulation in children, while adults showed an increase in correlation r. In addition, the correlation r between AMY1 copy number×total sAA amount and sAA activity was higher than that between AMY1 copy number, total sAA amount and sAA activity, respectively. Taken together, our results suggest that total sAA amount, glycosylated sAA amount, and the positive interaction between AMY1 copy number and total sAA amount are crucial in influencing sAA activity before and after stimulation in children and adults
More expression of BDNF associates with lung squamous cell carcinoma and is critical to the proliferation and invasion of lung cancer cells
Variational Quantum Metrology with Loschmidt Echo
By utilizing quantum mechanical effects, such as superposition and
entanglement, quantum metrology promises higher precision than the classical
strategies. It is, however, practically challenging to realize the quantum
advantages. This is mainly due to the difficulties in engineering non-classical
probe state and performing nontrivial measurement in practise, particularly
with a large number of particles. Here we propose a scalable scheme with a
symmetrical variational quantum circuit which, same as the Loschmidt echo,
consists of a forward and a backward evolution. We show that in this scheme the
quantum Fisher information, which quantifies the precision limit, can be
efficiently obtained from a measurement signal of the Loschmidt echo. We
experimentally implement the scheme on an ensemble of 10-spin quantum processor
and successfully achieves a precision near the theoretical limit which
outperforms the standard quantum limit with 12.4 dB. The scheme can be
efficiently implemented on various noisy intermediate-scale quantum devices
which provides a promising routine to demonstrate quantum advantages
Acupuncture for Essential Hypertension: A Meta-Analysis of Randomized Sham-Controlled Clinical Trials
Background. Acupuncture is frequently advocated as an adjunct treatment for essential hypertension. The aim of this review was to assess its adjunct effectiveness in treating hypertension. Methods. We searched PubMed, the Cochrane Library, EMBASE, and the Chinese databases Sino-Med, CNKI, WanFang, and VIP through November, 2012, for eligible randomized controlled trials that compared acupuncture with sham acupuncture. Outcome measures were changes in diastolic (DBP) and systolic blood pressure (SBP). Results. A total of 4 randomized controlled trials were included. We found no evidence of an improvement with the fact that acupuncture relative to sham acupuncture in SBP change (n=386; mean difference = −3.80 mmHg, 95% CI = −10.03–2.44 mmHg; I2=99%), and an insignificant improvement in DBP change (n=386; mean difference = −2.82 mmHg, 95% CI = −5.22–(−0.43) mmHg; I2=97%). In subgroup analyses, acupuncture significantly improved both SBP and DBP in patients taking antihypertensive medications. Only minor acupuncture-related adverse events were reported. Conclusions. Our results are consistent with acupuncture significantly lowers blood pressure in patients taking antihypertensive medications. We did not find that acupuncture without antihypertensive medications significantly improves blood pressure in those hypertensive patients
Pretreatment with Shenxiong Drop Pill induces AQP4- mediated neuroprotective effect on middle cerebral artery occlusion in rats
Purpose: To investigate the neuroprotective effect of Shenxiong Drop Pill (SXDP) pretreatment on rats with middle cerebral artery occlusion (MCAO) in rats, and the mechanism involved.Methods: Ninety-nine SD rats were randomly assigned to 4 groups: control group, MCAO group, shamoperated group and SXDP group. The MCAO model was established via thread occlusion. Rats in the SXDP group was administered SXDP 7 days before induction of MCAO. Neurological deficit score (NDS) was determined using Bederson's neurological behavioral scoring method, while cerebral infarction volume was measured using TTC staining. Integrated optical density (IOD) of Nissl Body was evaluated via Nissl staining. Brain water content was measured using dry-wet method. The expression level of AQP4 in brain tissues was determined using immunocytochemistry.Results: The SXDP treatment resulted in significant reduction in NDS, marked improvement in IOD of Nissl Body, and significant reductions in cerebral infarction volume, brain water content, and expression level of AQP4, relative to control (p< 0.05).Conclusion: These results suggest that SXDP pretreatment exerts neuroprotective effect against cerebral ischemia in rats by decreasing in cerebral edema through a mechanism involving downregulation of the expression of AQP4.
Keywords: Middle cerebral artery occlusion, Cerebral ischemia, Aquaporins-4, Cerebral edema, Neuroprotectio
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