Poly(ethylene oxide) (PEO)‐based electrolytes are promising for all‐solid‐state batteries but can only be used above room temperature due to the high‐degree crystallization of PEO and the intimate ...affinity between ethylene oxide (EO) chains and lithium ions. Here, a homogeneous‐inspired design of PEO‐based solid‐state electrolytes with fast ion conduction is proposed. The homogeneous PEO‐based solid‐state electrolyte with an adjusted succinonitrile (SN) and PEO molar ratio simultaneously suppresses the PEO crystallization and mitigates the affinity between EO and Li+. By adjusting the molar ratio of SN to PEO (SN:EO ≈ 1:4), channels providing fast Li+ transport are formed within the homogeneous solid‐state polymer electrolyte, which increases the ionic conductivity by 100 times and enables their application at a low temperature (0–25 °C), together with the uniform lithium deposition. This modified PEO‐based electrolyte also enables a LiFePO4 cathode to achieve a superior Coulombic efficiency (>99%) and have a long life (>750 cycles) at room temperature. Moreover, even at a low temperature of 0 °C, 82% of its room‐temperature capacity remains, demonstrating the great potential of this electrolyte for practical solid‐state lithium battery applications.
Homogeneous‐inspired design of solid‐state polymer electrolytes with fast ion conduction is proposed. By adjusting the molar ratio of succinonitrile to poly(ethylene oxide) (SN:EO≈1:4), channels providing fast Li+ transport are formed within the homogeneous solid‐state polymer electrolyte, which increases the ionic conductivity by 100 times and enables their application at a low temperature (0–25 °C).
This study presents a low-power multi-lead wearable electrocardiogram (ECG) signal sensor system design that can simultaneously acquire the electrocardiograms from three leads, I, II, and V1. The ...sensor system includes two parts, an ECG test clothing with five electrode patches and an acquisition device. Compared with the traditional 12-lead wired ECG detection instrument, which limits patient mobility and needs medical staff assistance to acquire the ECG signal, the proposed vest-type ECG acquisition system is very comfortable and easy to use by patients themselves anytime and anywhere, especially for the elderly. The proposed study incorporates three methods to reduce the power consumption of the system by optimizing the micro control unit (MCU) working mode, adjusting the radio frequency (RF) parameters, and compressing the transmitted data. In addition, Huffman lossless coding is used to compress the transmitted data in order to increase the sampling rate of the acquisition system. It makes the whole system operate continuously for a long period of time and acquire abundant ECG information, which is helpful for clinical diagnosis. Finally, a series of tests were performed on the designed wearable ECG device. The results have demonstrated that the multi-lead wearable ECG device can collect, process, and transmit ECG data through Bluetooth technology. The ECG waveforms collected by the device are clear, complete, and can be displayed in real-time on a mobile phone. The sampling rate of the proposed wearable sensor system is 250 Hz per lead, which is dependent on the lossless compression scheme. The device achieves a compression ratio of 2.31. By implementing a low power design on the device, the resulting overall operational current of the device is reduced by 37.6% to 9.87 mA under a supply voltage of 2.1 V. The proposed vest-type multi-lead ECG acquisition device can be easily employed by medical staff for clinical diagnosis and is a suitable wearable device in monitoring and nursing the off-ward patients.
Oxygen activation plays a crucial role in many important chemical reactions such as oxidation of organic compounds and oxygen reduction. For developing highly active materials for oxygen activation, ...herein, we report an atomically dispersed Pt on WO3 nanoplates stabilized by in situ formed amorphous H2WO4 out‐layer and the mechanism for activating molecular oxygen. Experimental and theoretical studies demonstrate that the isolated Pt atoms coordinated with oxygen atoms from WO6 and water of H2WO4, consequently leading to optimized surface electronic configuration and strong metal–support interaction (SMSI). In exemplified reactions of butanone oxidation sensing and oxygen reduction, the atomic Pt/WO3 hybrid exhibits superior activity than those of Pt nanoclusters/WO3 and bare WO3 as well as enhanced long‐term durability. This work will provide insight into the origin of activity and stability for atomically dispersed materials, thus promoting the development of highly efficient and durable single atom‐based catalysts.
Single atom‐based catalysts: Atomically dispersed Pt species have been stabilized by an in situ formed amorphous H2WO4 layer. The Pt atoms were coordinated by oxygen atoms from the WO6 octahedra of H2WO4 and water molecules. A strong metal–support interaction was observed between the Pt atoms and the oxide atoms of H2WO4, which resulted in a superior activity and stability of the Pt atoms for the oxygen activation.
Objective
This study aims to examine the levels of and associations between perceived stigma, self‐efficacy, and psychosocial adjustment (PA) among nasopharyngeal carcinoma (NPC) survivors, and to ...identify the mediating role of self‐efficacy between stigma and PA and explore the influencing factors of PA.
Methods
A cross‐sectional survey was conducted and 307 NPC survivors were recruited by convenience sampling method in Southern China from July 2019 to January 2020. Data analyses were performed with the SPSS WIN 25.0 program and PROCESS macro version 3.3.
Results
Stigma and self‐efficacy were positively associated with PA among Chinese NPC survivors. Tumor‐free survival time, late toxicities (fatigue, dizziness and headache, and hearing loss), stigma, and self‐efficacy entered the final regression model and explained 55.9% of the variance of PA. The total and direct effects of stigma on PA and its subscales were significant (p < 0.05). Positive indirect effects were found for stigma on PA via self‐efficacy (point estimate = 0.159, SE = 0.032, 95% CI 0.102 to 0.229).
Conclusions
Stigma and self‐efficacy are significantly associated with PA, and self‐efficacy is also a mediating variable between stigma and PA among NPC survivors. Medical staff could improve the PA of NPC survivors by alleviating their stigma, enhancing their self‐efficacy, and relieving their late toxicities (fatigue, dizziness and headache, and hearing loss).
The marginal likelihood is commonly used for comparing different evolutionary models in Bayesian phylogenetics and is the central quantity used in computing Bayes Factors for comparing model fit. A ...popular method for estimating marginal likelihoods, the harmonic mean (HM) method, can be easily computed from the output of a Markov chain Monte Carlo analysis but often greatly overestimates the marginal likelihood. The thermodynamic integration (TI) method is much more accurate than the HM method but requires more computation. In this paper, we introduce a new method, stepping stone sampling (SS), which uses importance sampling to estimate each ratio in a series (the "stepping stones") bridging the posterior and prior distributions. We compare the performance of the SS approach to the TI and HM methods in simulation and using real data. We conclude that the greatly increased accuracy of the SS and TI methods argues for their use instead of the HM method, despite the extra computation needed.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, IZUM, KILJ, NMLJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Reduced graphene oxide (RGO) sheets with different contents of oxygen-containing functional groups are prepared by controlling the reduction time in oxidation-reduction reaction. Results show that ...the structure, dispersion, and surface properties of RGO sheets are controlled by the number of oxygen-containing functional groups. The epoxy-based composite coating reinforced by 0.25 wt% RGO with 1 h reduction (EP/RGO1h) exhibits excellent corrosion protection behaviors due to synergism of the barrier effect, impenetrability, and hydrophobicity. Meanwhile, epoxy/graphene oxide (EP/GO) composite coating shows antimicrobial potential due to the oxidative stresses. This work provides a promising avenue to achieve novel graphene-based corrosion protection and antimicrobial composite coatings.
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•Graphene was used for corrosion protection and antimicrobial investigation.•0.25 wt% graphene exhibits excellent corrosion protection behaviors.•Graphene has the barrier effect, impenetrability, and hydrophobicity.•The epoxy/graphene composite coatings show antimicrobial potential.
In this work, reduced graphene oxides (RGO) with different contents of oxygen-containing functional groups are filled into epoxy matrix for corrosion protection and antimicrobial investigation. Results show that the structure, dispersion, and surface properties of RGO sheets in epoxy matrix are controlled by the content of oxygen-containing functional groups. The epoxy-based composite coating that involves 0.25 wt% graphene sheets (reduced by hydrazine hydrate for 1 h) exhibits excellent corrosion protection behaviors owing to synergism of the barrier effect, impenetrability, and hydrophobicity. Meanwhile, the epoxy/RGO coating shows the antimicrobial potentiality due to oxidative stress in the composite.
Vacancies enhance proton conductivityProton-exchange membranes (PEMs) allow for the transport of protons while acting as electrical insulators and ensuring that reactants are kept apart; therefore, ...they are a key component in devices such as low-temperature fuel cells. PEMs are typically made from polymers or materials embedded in a polymer matrix and need to operate in conditions of very high humidity. Starting with an inorganic, layered material, CdPS3, Qian et al. show that the removal of a small amount of cadmium introduces vacancies that greatly increase the proton conductivity of the PEMs (see the Perspective by Wang and He). The process works for manganese-based membranes as well, and high lithium ion transport was also observed.Science, this issue p. 596; see also p. 525Proton transport in nanochannels under humid conditions is crucial for the application in energy storage and conversion. However, existing materials, including Nafion, suffer from limited conductivity of up to 0.2 siemens per centimeter. We report a class of membranes assembled with two-dimensional transition-metal phosphorus trichalcogenide nanosheets, in which the transition-metal vacancies enable exceptionally high ion conductivity. A Cd0.85PS3Li0.15H0.15 membrane exhibits a proton conduction dominant conductivity of ~0.95 siemens per centimeter at 90° Celsius and 98% relative humidity. This performance mainly originates from the abundant proton donor centers, easy proton desorption, and excellent hydration of the membranes induced by cadmium vacancies. We also observed superhigh lithium ion conductivity in Cd0.85PS3Li0.3 and Mn0.77PS3Li0.46 membranes.
The literature on tools of attitudes towards ASD was limited. This study is the first to examine the factor structure and psychometric properties of the multidimensional attitudes scale toward ...persons with disabilities (MAS) in a sample of Chinese college students (N = 1002, 32.10% males). Confirmatory factor analysis supported the G-MAS-R model’s 4-factor structure: calm, negative affect, positive cognitions and behavioral avoidance. The results suggest that the Chinese version of the MAS has satisfactory internal consistency. Pearson correlation analysis showed that the MAS scores were significantly correlated with the Social Distance Scale and Autism Stigma and Knowledge Questionnaire scores. Overall, the findings indicate that the MAS is appropriate for assessing attitudes toward people with ASD in a Chinese context.
The interaction between human serum albumin (HSA) and hispidin, a polyketide abundantly present in both edible and therapeutic mushrooms, was explored through multispectral methods, hydrophobic probe ...assays, location competition trials, and molecular docking simulations. The results of fluorescence quenching analysis showed that hispidin quenched the fluorescence of HSA by binding to it via a static mechanism. The binding of hispidin and HSA was validated further by synchronous fluorescence, three-dimensional fluorescence, and UV/vis spectroscopy analysis. The apparent binding constant (Ka) at different temperatures, the binding site number (n), the quenching constants (Ksv), the dimolecular quenching rate constants (Kq), and the thermodynamic parameters (∆G, ∆H, and ∆S) were calculated. Among these parameters, ∆H and ∆S were determined to be 98.75 kJ/mol and 426.29 J/(mol·K), respectively, both exhibiting positive values. This observation suggested a predominant contribution of hydrophobic forces in the interaction between hispidin and HSA. By employing detergents (SDS and urea) and hydrophobic probes (ANS), it became feasible to quantify alterations in Ka and surface hydrophobicity, respectively. These measurements confirmed the pivotal role of hydrophobic forces in steering the interaction between hispidin and HSA. Site competition experiments showed that there was an interaction between hispidin and HSA molecules at site I, which situates the IIA domains of HSA, which was further confirmed by the molecular docking simulation.
Although numerous studies have demonstrated that social support affects a range of life experiences, few have examined its moderating and mediating effects. In the current study, 479 Chinese parents ...of children with ASD (aged 3–18 years) completed the surveys assessing parenting stress, social support and life satisfaction. Results indicated that parenting stress, social support and life satisfaction were significantly related. Moreover, social support both mediated and moderated the influence of parenting stress on life satisfaction. These findings imply that parenting stress and social support are critical indicators of life satisfaction and can serve as basic intervention strategies that promote life satisfaction among Chinese parents of children with ASD.
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