Detailed analysis of the microstructural changes during lithiation of a full‐concentration‐gradient (FCG) cathode with an average composition of LiNi0.75Co0.10Mn0.15O2 is performed starting from its ...hydroxide precursor, FCG Ni0.75Co0.10Mn0.15(OH)2 prior to lithiation. Transmission electron microscopy (TEM) reveals that a unique rod‐shaped primary particle morphology and radial crystallographic texture are present in the prelithiation stage. In addition, TEM detected a two‐phase structure consisting of MnOOH and Ni(OH)2, and crystallographic twins of MnOOH on the Mn‐rich precursor surface. The formation of numerous twins is driven by the lattice mismatch between MnOOH and Ni(OH)2. Furthermore, the twins persist in the lithiated cathode; however, their density decrease with increasing lithiation temperature. Cation disordering, which influences cathode performance, is observed to continuously decrease with increasing lithiation temperature with a minimum observed at 790 °C. Consequently, lithiation at 790 °C (for 10 h) produced optimal discharge capacity and cycling stability. Above 790 °C, an increase in cation disordering and excessive coarsening of the primary particles lead to the deterioration of electrochemical properties. The twins in the FCG cathode precursor may promote the optimal primary particle morphology by retarding the random coalescence of primary particles during lithiation, effectively preserving both the morphology and crystallographic texture of the precursor.
Crystallographic twins form by the precipitation of MnOOH in full‐concentration‐gradient precursors, Ni0.75Co0.10Mn0.15(OH)2, for Li‐ion batteries. The twins persist in cathodes through lithiation, but with varying density depending on the temperature of lithiation. The twin density influences the size and crystallographic orientation of primary particles in cathodes, which unequivocally affect their electrochemical properties.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
The “short‐circuit effect” in the fire‐through Ag metallization of crystalline Si (c‐Si) solar cells refers to the poor contact formation caused by an electrical short between the Ag gridline and ...underlying Si emitter during contact firing. This study employs two different Ag pastes containing PbO‐ and TeO2‐based glass frits to investigate the dependence of the short‐circuit effect on the length and pattern of the Ag finger lines. The results show that regardless of the employed glass frits, the short‐circuit effect is mitigated even near the short spot and gradually attenuated along the finger line away from the spot as the Ag finger line extends radially longer than the critical length (>35 mm). We demonstrate that this attenuation is independent of the finger line width and predominantly attributed to the ohmic drop of the electrode potential along the Si substrate. The results also show that, regardless of the glass frits, the contact quality is strongly correlated with the density of the Ag crystallites that are formed on the Si emitter surface. The 6‐in full‐cell tests indicate that the isolation of the short spots by segmenting the Ag finger lines does not necessarily result in the mitigation of the short‐circuit effect. We suggest that the reduction of Ag+ on the Si emitter surface should be the key process that must be controlled to achieve high‐quality contacts during contact firing, providing further insights into the electrochemical characteristics of contact firing reactions for the future development of Ag pastes.
The electrochemical nature of the contact firing reactions is studied by short‐circuiting the Ag fingers to the underlying Si emitter. The short‐circuit effect is gradually attenuated along the finger line away from the short‐spot owing to the ohmic drop of the electrode potential along the Si substrate. The contact quality is strongly correlated to the Ag crystallites formed on the emitter surface. The 6‐in full‐cell tests demonstrate that the segmentation of Ag fingers does not necessarily mitigate the short‐circuit effect.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
Background and Purpose
Paracetamol (acetaminophen)‐induced hepatotoxicity is the leading cause of drug‐induced liver injury worldwide. Autophagy is a degradative process by which various cargoes are ...collected by the autophagic receptors such as p62/SQSTM1/Sequestosome‐1 for lysosomal degradation. Here, we investigated the protective role of p62‐dependent autophagy in paracetamol‐induced liver injury.
Experimental Approach
Paracetamol‐induced hepatotoxicity was induced by a single i.p. injection of paracetamol (500 mg·kg−1) in C57/BL6 male mice. YTK‐2205 (20 mg·kg−1), a p62 agonist targeting ZZ domain, was co‐ or post‐administered with paracetamol. Western blotting and immunocytochemistry were performed to explore the mechanism.
Key Results
N‐terminal arginylation of the molecular chaperone calreticulin retro‐translocated from the endoplasmic reticulum (ER) was induced in the livers undergoing paracetamol‐induced hepatotoxicity, and YTK‐2205 exhibited notable therapeutic efficacy in acute hepatotoxicity as assessed by the levels of serum alanine aminotransferase and hepatic necrosis. This efficacy was significantly attributed to accelerated degradation of ubiquitin (Ub) conjugates as well as damaged mitochondria (mitophagy) and endoplasmic reticulum (ER‐phagy). In primary murine hepatocytes treated with paracetamol, YTK‐2205 induced the co‐localization of p62+LC3+ phagophores to the sites of mitophagy and ER‐phagy. A similar activity of YTK‐2205 was observed with N‐acetyl‐p‐benzoquinone imine, a putative toxic metabolite of paracetamol in Hep3B cells.
Conclusion and Implications
Our results elucidated that p62‐dependent autophagy plays a key role in the removal of cytotoxic materials such as damaged mitochondria in paracetamol‐induced hepatotoxicity. Small molecule ligands to p62 may be developed into drugs to treat this pathological condition.
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BFBNIB, DOBA, FZAB, GIS, IJS, IZUM, KILJ, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK
All-solid-state Li-rechargeable batteries using a 500 nm-thick LiCoO2 (LCO) film deposited on two NASICON-type solid electrolyte substrates, LICGC (OHARA Inc.) and Li1.3Al0.3Ti1.7(PO4)3 (LATP), are ...constructed. The postdeposition annealing temperature prior to the cell assembly is critical to produce a stable sharp LCO/electrolyte interface and to develop a strong crystallographic texture in the LCO film, conducive to migration of Li ions. Although the cells deliver a limited discharge capacity, the cells cycled stably for 50 cycles. The analysis of the LCO/electrolyte interfaces after cycling demonstrates that the sharp interface, once formed by proper thermal annealing, will remain stable without any evidence for contamination and with minimal intermixing of the constituent elements during cycling. Hence, although ionic conductivity of the NASICON-type solid electrolyte is lower than that of the sulfide electrolytes, the NACSICON-type electrolytes will maintain a stable interface in contact with a LCO cathode, which should be beneficial to improving the capacity retention as well as the rate capability of the all-solid state cell.
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IJS, KILJ, NUK, PNG, UL, UM
Reducing the duration of intraoperative hypoxemia in pediatric patients by means of rapid detection and early intervention is considered crucial by clinicians. We aimed to develop and validate a ...machine learning model that can predict intraoperative hypoxemia events 1 min ahead in children undergoing general anesthesia.
This retrospective study used prospectively collected intraoperative vital signs and parameters from the anesthesia ventilator machine extracted every 2 s in pediatric patients undergoing surgery under general anesthesia between January 2019 and October 2020 in a tertiary academic hospital. Intraoperative hypoxemia was defined as oxygen saturation <95% at any point during surgery. Three common machine learning techniques were employed to develop models using the training dataset: gradient-boosting machine (GBM), long short-term memory (LSTM), and transformer. The performances of the models were compared using the area under the receiver operating characteristics curve using randomly assigned internal testing dataset. We also validated the developed models using temporal holdout dataset. Pediatric patient surgery cases between November 2020 and January 2021 were used. The performances of the models were compared using the area under the receiver operating characteristic curve (AUROC).
In total, 1,540 (11.73%) patients with intraoperative hypoxemia out of 13,130 patients' records with 2,367 episodes were included for developing the model dataset. After model development, 200 (13.25%) of the 1,510 patients' records with 289 episodes were used for holdout validation. Among the models developed, the GBM had the highest AUROC of 0.904 (95% confidence interval CI 0.902 to 0.906), which was significantly higher than that of the LSTM (0.843, 95% CI 0.840 to 0.846 P < .001) and the transformer model (0.885, 95% CI, 0.882-0.887, P < .001). In holdout validation, GBM also demonstrated best performance with an AUROC of 0.939 (95% CI 0.936 to 0.941) which was better than LSTM (0.904, 95% CI 0.900 to 0.907, P < .001) and the transformer model (0.929, 95% CI 0.926 to 0.932, P < .001).
Machine learning models can be used to predict upcoming intraoperative hypoxemia in real-time based on the biosignals acquired by patient monitors, which can be useful for clinicians for prediction and proactive treatment of hypoxemia in an intraoperative setting.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Sugammadex, a selective antagonist of steroidal non‐depolarizing neuromuscular blocking agents, has been used in children in limited circumstances. However, neither pharmacokinetics (PKs) nor ...recovery profile of sugammadex for intense neuromuscular blockade reversal in children have been reported. This prospective study aimed to obtain a PK model of sugammadex and evaluate its efficacy and safety for intense neuromuscular blockade reversal in children. Forty children (age, 2–17 years) who underwent surgery that required early neuromuscular blockade reversal were enrolled. After neuromuscular blockade with 1 mg∙kg−1 of rocuronium, sugammadex (2, 4, and 8 mg∙kg−1) or a conventional dose of neostigmine (0.03 mg∙kg−1) was administered randomly after confirmation of zero post‐tetanic count. The plasma concentrations of rocuronium and sugammadex were measured 2 min after rocuronium injection; immediately before, 2, 5, 15, 60, 120, 240, and 480 min after the study drug injection. Response to train‐of‐four stimulation was continuously recorded. Noncompartmental analysis and population PK modeling were performed. For pharmacodynamics, the recovery profile was measured. Three‐compartment PK model was established for sugammadex. The median (interquartile range IQR) time from injection of 8 mg∙kg−1 of sugammadex to recovery of T4/T1greater than or equal to 0.9 at train‐of‐four stimulation was 1.1 (IQR: 0.88–1.8) min. No adverse events related to sugammadex were observed. We present a PK analysis of sugammadex for rocuronium‐induced intense neuromuscular blockade reversal in children with its recovery profile. The time to recover T4/T1 greater than or equal to 0.9 at train‐of‐four stimulation with 8 mg∙kg−1 of sugammadex was less than 3 min and comparable to that in adults.
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FZAB, GIS, IJS, IZUM, KILJ, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBMB, UL, UM, UPUK
•While focusing on visitors’ museum experience, new display methods to provide exhibition content in ways that allow visitors to better understand artifacts on display.•The lack of interaction with ...visitors and the use of lighting that clearly separates real and virtual spaces have made museums inadequate as experiential spaces.•To resolve those problems, this article suggests a plan to deploy content services for visitors’ museum experiences by combining beacons and HMDs.•This study establishes the concept of a service, which provides a virtual world experience by connecting a beacon installed in real space, that is, an exhibition room, to an HMD.•Ultimately, this article presents the exhibition content thus created as experienced Metaverse made through an effective combination of AR and a virtual world.
Today, methods of museum exhibition are rapidly changing. While focusing on visitors’ museum experience, new display methods employ a variety of digital technologies to provide exhibition content in ways that allow visitors to better understand artifacts on display. However, the majority of such methods rely on one-way means of delivering information. The lack of interaction with visitors and the use of lighting that clearly separates real and virtual spaces have made museums inadequate as experiential spaces. To resolve those problems, this article suggests a plan to deploy content services for visitors’ museum experiences by combining beacons and HMDs. This study establishes the concept of a service, which provides a virtual world experience by connecting a beacon installed in real space, that is, an exhibition room, to an HMD (head-mounted display). Furthermore, the service also incorporates a storytelling feature to diversify user experience by presenting the characteristics of and stories about artifacts. The service design will make both online and on-site museum experiences meaningful. Ultimately, this article presents the exhibition content thus created as Metaverse exhibition content made through an effective combination of augmented reality and a virtual world.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
Chronic exposure to ultraviolet B (UVB) is a major cause of skin aging. The aim of the present study was to determine the photoprotective effect of a 30% ethanol extract of
(Kjellman) Setchell (EEB) ...against UVB-induced skin aging. By treating human dermal fibroblasts (Hs68) with EEB after UVB irradiation, we found that EEB had a cytoprotective effect. EEB treatment significantly decreased UVB-induced matrix metalloproteinase-1 (MMP-1) production by suppressing the activation of mitogen-activated protein kinase (MAPK)/activator protein 1 (AP-1) signaling and enhancing the protein expression of tissue inhibitors of metalloproteinases (TIMPs). EEB was also found to recover the UVB-induced degradation of pro-collagen by upregulating Smad signaling. Moreover, EEB increased the mRNA expression of filaggrin, involucrin, and loricrin in UVB-irradiated human epidermal keratinocytes (HaCaT). EEB decreased UVB-induced reactive oxygen species (ROS) generation by upregulating glutathione peroxidase 1 (GPx1) and heme oxygenase-1 (HO-1) expression via nuclear factor erythroid-2-related factor 2 (Nrf2) activation in Hs68 cells. In a UVB-induced HR-1 hairless mouse model, the oral administration of EEB mitigated photoaging lesions including wrinkle formation, skin thickness, and skin dryness by downregulating MMP-1 production and upregulating the expression of pro-collagen type I alpha 1 chain (pro-COL1A1). Collectively, our findings revealed that EEB prevents UVB-induced skin damage by regulating MMP-1 and pro-collagen type I production through MAPK/AP-1 and Smad pathways.
Aims
This study determined the optimal positive end‐expiratory pressure levels in infants in supine and prone positions under general anesthesia using electrical impedance tomography (EIT).
Methods
...This prospective observational single‐centre study included infants scheduled for surgery in the prone position. An electrical impedance tomography sensor was applied after inducing general anesthesia. The optimal positive end‐expiratory pressure in the supine position was determined in a decremental trial based on EIT and compliance. Subsequently, the patient's position was changed to prone. Electrical impedance tomography parameters, including global inhomogeneity index, regional ventilation delay, opening pressure, the centre of ventilation, and pendelluft volume, were continuously obtained up to 1 h after prone positioning. The optimal positive end‐expiratory pressure in the prone position was similarly determined.
Results
Data from 30 infants were analyzed. The mean value of electrical impedance tomography‐based optimal positive end‐expiratory pressure in the prone position was significantly higher than that in the supine position 10.9 (1.6) cmH2O and 6.1 (0.9) cmH2O, respectively (p < .001). Significant differences were observed between electrical impedance tomography‐ and compliance‐based optimal positive end‐expiratory pressure. Peak and mean airway, plateau, and driving pressures increased 1 h after prone positioning compared with those in the supine position. In addition, the centre of ventilation for balance in ventilation between the ventral and dorsal regions improved.
Conclusion
The prone position required higher positive end‐expiratory pressure than the supine position in mechanically ventilated infants under general anesthesia. EIT is a promising tool to find the optimal positive end‐expiratory pressure, which needs to be individualized.
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FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
Boiler waterwall tube leakage is the most probable cause of failure in steam power plants (SPPs). The development of an intelligent tube leak detection system can increase the efficiency and ...reliability of modern power plants. The idea of e-maintenance based on multivariate algorithms was recently introduced for intelligent fault detection and diagnosis in SPPs. However, these multivariate algorithms are highly dependent on the number of input process variables (sensors). Therefore, this work proposes a machine learning-based model integrated with an optimal sensor selection scheme to analyze boiler waterwall tube leakage. Finally, a real SPP test case is employed to validate the proposed model’s effectiveness. The results indicate that the proposed model can successfully detect waterwall tube leakage with improved accuracy vs. other comparable models.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
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