172 research outputs found
The evaluation of the thermal storage electric heating load adjustability
In recent years, in order to solve the environmental pollution problem caused by coal-fired heating in the heating area of north of china, electric heating has received extensive attention and has gradually been developed vigorously. Considering the building characteristics, outdoor temperature, indoor comfort and other factors, the building heat load adjustability model is established, and the heat storage device's load adjustability model considering the current operating status and heat storage capacity of the heat storage device is established, and the two are added together An evaluation model of the adjustability of regenerative electric heating users' load is obtained. This model not only considers the user comfort and the adjustment potential of the building where it is located, but also considers the adjustment potential of the heat storage device, which can more comprehensively and accurately evaluate the user load adjustment potential of thermal storage electric heating
Mammalian splicing divergence is shaped by drift, buffering in trans, and a scaling law
Alternative splicing is ubiquitous, but the mechanisms underlying its pattern of evolutionary divergence across mammalian tissues are still underexplored. Here, we investigated the cis-regulatory divergences and their relationship with tissue-dependent trans-regulation in multiple tissues of an F1 hybrid between two mouse species. Large splicing changes between tissues are highly conserved and likely reflect functional tissue-dependent regulation. In particular, micro-exons frequently exhibit this pattern with high inclusion levels in the brain. Cis-divergence of splicing appears to be largely non-adaptive. Although divergence is in general associated with higher densities of sequence variants in regulatory regions, events with high usage of the dominant isoform apparently tolerate more mutations, explaining why their exon sequences are highly conserved but their intronic splicing site flanking regions are not. Moreover, we demonstrate that non-adaptive mutations are often masked in tissues where accurate splicing likely is more important, and experimentally attribute such buffering effect to trans-regulatory splicing efficiency
Effects of Pressure and Doping on Ruddlesden-Popper phases Lan+1NinO3n+1
Recently the discovery of superconductivity with a critical temperature Tc up
to 80 K in Ruddlesden-Popper phases Lan+1NinO3n+1 (n = 2) under pressure has
garnered considerable attention. Up to now, the superconductivity was only
observed in La3Ni2O7 single crystal grown with the optical-image floating zone
furnace under oxygen pressure. It remains to be understood the effect of
chemical doping on superconducting La3Ni2O7 as well as other Ruddlesden-Popper
phases. Here, we systematically investigate the effect of external pressure and
chemical doping on polycrystalline Ruddlesden-Popper phases. Our results
demonstrate the application of pressure and doping effectively tunes the
transport properties of Ruddlesden-Popper phases. We find pressure-induced
superconductivity up to 86 K in La3Ni2O7 polycrystalline sample, while no
signatures of superconductivity are observed in La2NiO4 and La4Ni3O10 systems
under high pressure up to 50 GPa. Our study sheds light on the exploration of
high-Tc superconductivity in nickelates.Comment: 21 papes, 8 figures and 1 tabl
Effect of physical and chemical pressure on the superconductivity of caged-type quasiskutterudite Lu5Rh6Sn18
Lu5Rh6Sn18 is one of the caged-type quasiskutterudite superconductors with
superconducting transition temperature Tc = 4.12 K. Here, we investigate the
effect of pressure on the superconductivity in Lu5Rh6Sn18 by combining high
pressure electrical transport, synchrotron x-ray diffraction (XRD) and chemical
doping. Application of high pressure can enhance both the metallicity and the
superconducting transition temperature in Lu5Rh6Sn18. Tc is found to show a
continuous increase reaching up to 5.50 K at 11.4 GPa. Our high pressure
synchrotron XRD measurements demonstrate the stability of the pristine crystal
structure up to 12.0 GPa. In contrast, Tc is suppressed after the substitution
of La ions in Lu sites, inducing negative chemical pressure. Our study provides
valuable insights into the improvement of superconductivity in caged compounds.Comment: 9 pages, 8 figure
Assessment of short-term effects of thoracic radiotherapy on the cardiovascular parasympathetic and sympathetic nervous systems
BackgroundPrior research suggests that cardiovascular autonomic dysfunction might be an early marker of cardiotoxicity induced by antitumor treatment and act as an early predictor of cardiovascular disease-related morbidity and mortality. The impact of thoracic radiotherapy on the parasympathetic and sympathetic nervous systems, however, remains unclear. Therefore, this study aimed to evaluate the short-term effects of thoracic radiotherapy on the autonomic nervous system, using deceleration capacity (DC), acceleration capacity (AC) of heart rate, and heart rate variability (HRV) as assessment tools.MethodsA 5 min electrocardiogram was collected from 58 thoracic cancer patients before and after thoracic radiotherapy for DC, AC, and HRV analysis. HRV parameters employed included the standard deviation of the normal-normal interval (SDNN), root mean square of successive interval differences (RMSSD), low frequency power (LF), high frequency power (HF), total power (TP), and the LF to HF ratio. Some patients also received systemic therapies alongside radiotherapy; thus, patients were subdivided into a radiotherapy-only group (28 cases) and a combined radiotherapy and systemic therapies group (30 cases) for additional subgroup analysis.ResultsThoracic radiotherapy resulted in a significant reduction in DC (8.5 [5.0, 14.2] vs. 5.3 [3.5, 9.4], p = 0.002) and HRV parameters SDNN (9.9 [7.03, 16.0] vs. 8.2 [6.0, 12.4], p = 0.003), RMSSD (9.9 [6.9, 17.5] vs. 7.7 [4.8, 14.3], p = 0.009), LF (29 [10, 135] vs. 24 [15, 50], p = 0.005), HF (35 [12, 101] vs. 16 [9, 46], p = 0.002), TP (74 [41, 273] vs. 50 [33, 118], p < 0.001), and a significant increase in AC (−8.2 [−14.8, −4.9] vs. -5.8 [−10.1, −3.3], p = 0.003) and mean heart rate (79.8 ± 12.6 vs. 83.9 ± 13.6, p = 0.010). Subgroup analysis indicated similar trends in mean heart rate, DC, AC, and HRV parameters (SDNN, RMSSD, LF, HF, TP) in both the radiotherapy group and the combined treatment group post-radiotherapy. No statistically significant difference was noted in the changes observed in DC, AC, and HRV between the two groups pre- and post-radiotherapy.ConclusionThoracic radiotherapy may induce cardiovascular autonomic dysfunction by reducing parasympathetic activity and enhancing sympathetic activity. Importantly, the study found that the concurrent use of systemic therapies did not significantly amplify or contribute to the alterations in autonomic function in the short-term following thoracic radiotherapy. DC, AC and HRV are promising and feasible biomarkers for evaluating autonomic dysfunction caused by thoracic radiotherapy
Pressure-induced Superconductivity and Structure Phase Transition in SnAs-based Zintl Compound SrSn2As2
Layered SnAs-based Zintl compounds exhibit a distinctive electronic
structure, igniting extensive research efforts in areas of superconductivity,
topological insulators and quantum magnetism. In this paper, we systematically
investigate the crystal structures and electronic properties of the Zintl
compound SrSn2As2 under high-pressure. At approximately 20.8 GPa,
pressure-induced superconductivity is observed in SrSn2As2 with a
characteristic dome-like evolution of Tc. Theoretical calculations together
with high pressure synchrotron X-ray diffraction and Raman spectroscopy have
identified that SrSn2As2 undergoes a structural transformation from a trigonal
to a monoclinic structure. Beyond 28.3 GPa, the superconducting transition
temperature is suppressed due to a reduction of the density of state at the
Fermi level. The discovery of pressure-induced superconductivity, accompanied
by structural transitions in SrSn2As2, greatly expands the physical properties
of layered SnAs-based compounds and provides a new ground states upon
compression.Comment: 15 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2307.1562
Pressure-tunable magnetic topological phases in magnetic topological insulator MnSb4Te7
Magnetic topological insulators, possessing both magnetic order and
topological electronic structure, provides an excellent platform to research
unusual physical properties. Here, we report a high-pressure study on the
anomalous Hall effect of magnetic TI MnSb4Te7 through transports measurements
combined with first-principle theoretical calculations. We discover that the
ground state of MnSb4Te7 experiences a magnetic phase transition from the
A-type antiferromagnetic state to ferromagnetic dominating state at 3.78 GPa,
although its crystal sustains a rhombohedral phase under high pressures up to 8
GPa. The anomalous Hall conductance {\sigma}xyA keeps around 10 {\Omega}-1
cm-1, dominated by the intrinsic mechanism even after the magnetic phase
transition. The results shed light on the intriguing magnetism in MnSb4Te7 and
pave the way for further studies of the relationship between topology and
magnetism in topological materials.Comment: 10 pages, 4 figure
COVERT COMMUNICATION FOR COOPERATIVE NOMA WITH TWO PHASES DETECTION
This paper investigates the covert communication of cooperative non-orthogonal multiple access (NOMA) systems, where the near user serves as a decode-and-forward (DF) relay and the far user receives the covert information from both the source and the near user. To improve the covertness performance, cooperative jamming and power randomness are adopted. Specifically, we derive detection error probability (DEP) of Willie and the minimum detection error probability (MDEP) at the optimal decision threshold for each phase. In addition, the reliability of the proposed system is investigated by deriving closed-form expressions for the outage probability (OP) of the two users. Under the covertness and reliability constraints, an optimization algorithm to maximize the effective covert rate is designed. Simulation results have confirmed the correctness of the theoretical analysis, and the proposed scheme can achieve a better covert communication
Pressure-induced Superconductivity in Zintl Topological Insulator SrIn2As2
The Zintl compound AIn2X2 (A = Ca, Sr, and X = P, As), as a theoretically
predicted new non-magnetic topological insulator, requires experiments to
understand their electronic structure and topological characteristics. In this
paper, we systematically investigate the crystal structures and electronic
properties of the Zintl compound SrIn2As2 under both ambient and high-pressure
conditions. Based on systematic angle-resolved photoemission spectroscopy
(ARPES) measurements, we observed the topological surface states on its (001)
surface as predicted by calculations, indicating that SrIn2As2 is a strong
topological insulator. Interestingly, application of pressure effectively tuned
the crystal structure and electronic properties of SrIn2As2. Superconductivity
is observed in SrIn2As2 for pressure where the temperature dependence of the
resistivity changes from a semiconducting-like behavior to that of a metal. The
observation of nontrivial topological states and pressure-induced
superconductivity in SrIn2As2 provides crucial insights into the relationship
between topology and superconductivity, as well as stimulates further studies
of superconductivity in topological materials.Comment: 15 pages,5 figure
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