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Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)
Topological quantum materials represent a new class of matter with both exotic physical phenomena and novel application potentials. Many Heusler compounds, which exhibit rich emergent properties such as unusual magnetism, superconductivity and heavy fermion behaviour, have been predicted to host non-trivial topological electronic structures. The coexistence of topological order and other unusual properties makes Heusler materials ideal platform to search for new topological quantum phases (such as quantum anomalous Hall insulator and topological superconductor). By carrying out angle-resolved photoemission spectroscopy and
ab initio
calculations on rare-earth half-Heusler compounds LnPtBi (Ln=Lu, Y), we directly observe the unusual topological surface states on these materials, establishing them as first members with non-trivial topological electronic structure in this class of materials. Moreover, as LnPtBi compounds are non-centrosymmetric superconductors, our discovery further highlights them as promising candidates of topological superconductors.
Heusler compounds have been predicted to host topological order with other emergent properties, which yet awaits for experimental evidence. Here, Liu
et al
. report a direct observation of topological surface states on half-Heusler compounds LnPtBi.
Journal Article
Intratracheal Administration of Budesonide/Surfactant to Prevent Bronchopulmonary Dysplasia
Bronchopulmonary dysplasia (BPD) is an important complication of mechanical ventilation in preterm infants, and no definite therapy can eliminate this complication. Pulmonary inflammation plays a crucial role in its pathogenesis, and glucocorticoid is one potential therapy to prevent BPD.
To compare the effect of intratracheal administration of surfactant/budesonide with that of surfactant alone on the incidence of death or BPD.
A clinical trial was conducted in three tertiary neonatal centers in the United States and Taiwan, in which 265 very-low-birth-weight infants with severe respiratory distress syndrome who required mechanical ventilation and inspired oxygen (fraction of inspired oxygen, ≥50%) within 4 hours of birth were randomly assigned to one of two groups (131 intervention and 134 control). The intervention infants received surfactant (100 mg/kg) and budesonide (0.25 mg/kg), and the control infants received surfactant only (100 mg/kg), until each infant required inspired O2 at less than 30% or was extubated.
The intervention group had a significantly lower incidence of BPD or death (55 of 131 [42.0%] vs. 89 of 134 [66%]; risk ratio, 0.58; 95% confidence interval, 0.44-0.77; P < 0.001; number needed to treat, 4.1; 95% confidence interval, 2.8-7.8). The intervention group required significantly fewer doses of surfactant than did the control group. The intervention group had significantly lower interleukin levels (IL-1, IL-6, IL-8) in tracheal aspirates at 12 hours and lower IL-8 at 3-5 and 7-8 days.
In very-low-birth-weight infants with severe respiratory distress syndrome, intratracheal administration of surfactant/budesonide compared with surfactant alone significantly decreased the incidence of BPD or death without immediate adverse effect. Clinical trial registered with www.clinicaltrials.gov (NCT-00883532).
Journal Article
Radiative Feedback From Dry Environmental Air Accelerates Tropical Cyclogenesis
A number of recent studies have highlighted how radiative feedback from clouds accelerates tropical cyclone (TC) development by amplifying spatial gradients in radiative heating. This study extends this work by examining how spatial gradients in free tropospheric moisture influence TC development through their impact on environmental radiative heating. We conduct a series of idealized model experiments in which only the longwave radiative heating due to water vapor is modified in the environmental region outside of the TC area. These experiments demonstrate that a vortex in a drier environmental free troposphere experiences faster development. Moreover, weaker vortices actually require a dry environmental free troposphere to develop. The accelerated genesis mainly results from a stronger spatial gradient in moisture‐induced radiative heating, which enhances energy convergence through a stronger transverse circulation. These results highlight a potentially important and overlooked role of dry air in facilitating TC genesis. Plain Language Summary Recent studies have shown that clouds play an important role in making hurricanes stronger by affecting how heat is distributed. This study builds on that work by looking at how moisture in the environmental air away from the storm center also influences hurricane development through its impact on heat distribution. Computer simulations in which only the heating due to the absorption of infrared heat by water vapor outside the hurricane area was varied showed that hurricanes with drier environmental air develop faster. Further analysis revealed that this faster development is mainly because of a stronger difference in how heat is distributed due to moisture. Our results suggest that dry air might play a crucial and overlooked role in helping hurricanes form. Key Points Dry environment accelerates tropical cyclone genesis through moisture‐induced gradients in radiative heating A dry environmental free troposphere enhances the radiative heating gradient between TC area and its surroundings The moisture‐induced radiative feedback enhances the energy convergence and is critical to TC genesis in the early stages of development
Journal Article
Clinical practice of pediatric psychology
\"Filled with vivid clinical material, this book describes effective practices for helping children and their families who are coping with chronic and acute health conditions and their treatment. Concise chapters on the psychosocial challenges associated with specific pediatric health conditions are organized around detailed case presentations. Demonstrating procedures for assessment, case conceptualization, brief intervention, and health promotion, the book highlights ways to collaborate successfully with medical providers and families. Chapters also discuss the varied roles that pediatric psychologists play in hospitals, outpatient clinics, primary care, and educational settings. Subject Areas/Keywords: adolescents, behavioral health, childhood, children, chronic, conditions, developmental disabilities, diseases, families, family, health behaviors, health promotion, health psychology, illnesses, interventions, medical disorders, pain, pediatric psychology, prevention, primary care, problems, psychological disorders, schools Audience: Clinical child and health psychologists, clinical social workers, psychiatrists, nurses, and school psychologists; also of interest to pediatricians\"--Provided by publisher.
Book
A fully integrated wearable ultrasound system to monitor deep tissues in moving subjects
Recent advances in wearable ultrasound technologies have demonstrated the potential for hands-free data acquisition, but technical barriers remain as these probes require wire connections, can lose track of moving targets and create data-interpretation challenges. Here we report a fully integrated autonomous wearable ultrasonic-system-on-patch (USoP). A miniaturized flexible control circuit is designed to interface with an ultrasound transducer array for signal pre-conditioning and wireless data communication. Machine learning is used to track moving tissue targets and assist the data interpretation. We demonstrate that the USoP allows continuous tracking of physiological signals from tissues as deep as 164 mm. On mobile subjects, the USoP can continuously monitor physiological signals, including central blood pressure, heart rate and cardiac output, for as long as 12 h. This result enables continuous autonomous surveillance of deep tissue signals toward the internet-of-medical-things.
A wearable ultrasound patch monitors subjects in motion using machine learning and wireless electronics.
Journal Article
Direct and indirect Z-scheme heterostructure-coupled photosystem enabling cooperation of CO2 reduction and H2O oxidation
The stoichiometric photocatalytic reaction of CO
2
with H
2
O is one of the great challenges in photocatalysis. Here, we construct a Cu
2
O-Pt/SiC/IrO
x
composite by a controlled photodeposition and then an artificial photosynthetic system with Nafion membrane as diaphragm separating reduction and oxidation half-reactions. The artificial system exhibits excellent photocatalytic performance for CO
2
reduction to HCOOH and H
2
O oxidation to O
2
under visible light irradiation. The yields of HCOOH and O
2
meet almost stoichiometric ratio and are as high as 896.7 and 440.7 μmol g
−1
h
−1
, respectively. The high efficiencies of CO
2
reduction and H
2
O oxidation in the artificial system are attributed to both the direct Z-scheme electronic structure of Cu
2
O-Pt/SiC/IrO
x
and the indirect Z-scheme spatially separated reduction and oxidation units, which greatly prolong lifetime of photogenerated electrons and holes and prevent the backward reaction of products. This work provides an effective and feasible strategy to increase the efficiency of artificial photosynthesis.
The stoichiometric photoreaction of CO
2
with H
2
O is one of the big challenges in photocatalysis. An artificial photosynthetic system based on a direct and indirect Z-scheme heterostructure is synthesised, enabling simultaneous CO
2
reduction to HCOOH and H
2
O oxidation to O
2
.
Journal Article