bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chalcogenide Perovskite Thin Films with Controlled Phases for Optoelectronics
Authors: Yu Zhonghai , Hui Haolei , West Damien , Zhang Han , Sun Yiyang , Kong Sen , Zhang Yin , Deng Chenhua , Yang Sen , Zhang Shengbai , Zeng Hao 
Published: November 2023

AbstractChalcogenide perovskites have emerged as promising semiconductor materials due to their appealing properties, including tunable bandgaps, high absorption coefficients, reasonable carrier lifetimes and mobilities, excellent chemical stability, and environmentally benign nature. However, beyond the well‐studied BaZrS3, reports on chalcogenide perovskite thin films with diverse compositions are scarce. In this study, the realization of four different types of chalcogenide perovskite thin films with controlled phases, through CS2 annealing of amorphous chalcogenide precursor films deposited by pulsed laser deposition (PLD), is reported. This achievement is guided by a thorough theoretical investigation of the phase stability of chalcogenide perovskites. Upon crystallization in the distorted perovskite phase, all materials exhibit photoluminescence (PL) with peak positions in the visible range, consistent with their expected bandgap values. However, the full‐width‐at‐half‐maximum (FWHM) of the PL spectra varies significantly across these materials, ranging from 99 meV for SrHfS3 to 231 meV for BaHfS3. The difference is attributed to the difference in kinetic barriers between local structural motifs for the Sr and Ba compounds. The findings underscore the promise of chalcogenide perovskite thin films as an alternative to traditional halide perovskites for optoelectronic applications, while highlighting the challenges in optimizing their synthesis and performance.
Retarding Ion Migration for Stable Blade‐Coated Inverted Perovskite Solar Cells
Authors: Zhu Hongwei , Shao Bingyao , Yin Jun , Shen Zhongjin , Wang Lijie , Huang Ren‐Wu , Chen Bin , Wehbe Nimer , Ahmad Taimoor , Abulikemu Mutalifu , Jamal Aqil , Gereige Issam , Freitag Marina , Mohammed Omar F. , Sargent Edward H. , Bakr Osman M. 
Published: November 2023

AbstractThe fabrication of perovskite solar cells (PSCs) through blade coating is seen as one of the most viable paths toward commercialization. However, relative to the less scalable spin coating method, the blade coating process often results in more defective perovskite films with lower grain uniformity. Ion migration, facilitated by those elevated defect levels, is one of the main triggers of phase segregation and device instability. Here, a bifunctional molecule, p‐aminobenzoic acid (PABA), which enhances the barrier to ion migration, induces grain growth along the (100) facet, and promotes the formation of homogeneous perovskite films with fewer defects, is reported. As a result, PSCs with PABA achieved impressive power conversion efficiencies (PCEs) of 23.32% and 22.23% for devices with active areas of 0.1 cm2 and 1 cm2, respectively. Furthermore, these devices maintain 93.8% of their initial efficiencies after 1 000 h under 1‐sun illumination, 75 °C, and 10% relative humidity conditions.
Purple‐Light Promoted Thiol‐ene Reaction of Alkenes
Authors: Renzi Polyssena , Rusconi Marco , Ghigo Giovanni , Deagostino Annamaria 
Published: November 2023

AbstractHere we present a catalyst‐free protocol for the purple light‐mediated anti‐Markovnikov functionalization of alkenes with thiols. Crucial to the generation of the thiyl radical was the formation of a key photo‐active complex. More than 30 thioether products were obtained, demonstrating tolerance towards different functional groups and scalability up to 5 mmol of alkene. Two different reaction conditions have been developed, varying both the solvent and the amount of thiol. Depending on the alkene structure, water can be used as an alternative to dichloromethane as a solvent, thus increasing the sustainability of the whole process.
Tissue Equivalent Curved Organic X‐ray Detectors Utilizing High Atomic Number Polythiophene Analogues
Authors: Nanayakkara M. Prabodhi A. , He Qiao , Ruseckas Arvydas , Karalasingam Anushanth , Matjacic Lidija , Masteghin Mateus G. , Basiricò Laura , Fratelli Ilaria , Ciavatti Andrea , Kilbride Rachel C. , Jenatsch Sandra , Parnell Andrew J. , Fraboni Beatrice , Nisbet Andrew , Heeney Martin , Jayawardena K. D. G. Imalka , Silva S. Ravi P. 
Published: November 2023

AbstractOrganic semiconductors are a promising material candidate for X‐ray detection. However, the low atomic number (Z) of organic semiconductors leads to poor X‐ray absorption thus restricting their performance. Herein, the authors propose a new strategy for achieving high‐sensitivity performance for X‐ray detectors based on organic semiconductors modified with high –Z heteroatoms. X‐ray detectors are fabricated with p‐type organic semiconductors containing selenium heteroatoms (poly(3‐hexyl)selenophene (P3HSe)) in blends with an n‐type fullerene derivative ([6,6]‐Phenyl C71 butyric acid methyl ester (PC70BM). When characterized under 70, 100, 150, and 220 kVp X‐ray radiation, these heteroatom‐containing detectors displayed a superior performance in terms of sensitivity up to 600 ± 11 nC Gy−1 cm−2 with respect to the bismuth oxide (Bi2O3) nanoparticle (NP) sensitized organic detectors. Despite the lower Z of selenium compared to the NPs typically used, the authors identify a more efficient generation of electron‐hole pairs, better charge transfer, and charge transport characteristics in heteroatom‐incorporated detectors that result in this breakthrough detector performance. The authors also demonstrate flexible X‐ray detectors that can be curved to a radius as low as 2 mm with low deviation in X‐ray response under 100 repeated bending cycles while maintaining an industry‐standard ultra‐low dark current of 0.03 ± 0.01 pA mm−2.
Fundamental Understanding and Applications of Protonic Y‐ and Yb‐Coped Ba(Ce,Zr)O3 Perovskites: State‐of‐the‐Art and Perspectives
Authors: Danilov Nikolai A. , Starostina Inna A. , Starostin George N. , Kasyanova Anna V. , Medvedev Dmitry A. , Shao Zongping 
Published: November 2023

AbstractProton‐conducting oxide materials are interesting objects from both fundamental and applied viewpoints due to the origination of protonic defects in a crystal structure as a result of their interaction with hydrogen‐containing atmospheres at elevated temperatures. The high mobility of such defects at temperatures between 400 and 700 °C leads to superior ionic conductivity. As a result, some perovskite‐type proton‐conducting oxides have been proposed as electrolytes for solid oxide fuel and electrolysis cells. Barium cerate (BaCeO3), barium zirconate (BaZrO3), and barium cerate‐zirconates (BaCeO3–BaZrO3) have been widely studied in terms of the parent phases of proton‐conducting electrolytes. Among them, Y and Yb co‐doped Ba(Ce,Zr)O3 can be identified as one of the most promising systems so far. This review discloses key functional properties of such phases and explains the increased attention of researchers to this system.
Ultra‐High DC and Low Impedance Output for Free‐Standing Triboelectric Nanogenerator
Authors: Ren Dahu , Yang Huake , Zhang Xuemei , Li Qianying , Yang Qianxi , Li Xiaochuan , Ji Peiyuan , Yu Peng , Xi Yi , Wang Zhong Lin 
Published: November 2023

AbstractThe free‐standing triboelectric nanogenerator (F‐S TENG) is demonstrated to be an efficient energy conversion device. However, limited by the inherent features of high‐voltage, low alternating current and high output impedance, TENGs suffer from inefficient energy utilization and difficulties in practical applications. Therefore, the efficient harvest of mechanical energy and optimization of output are currently critical issues for TENGs. Here, a strategy is proposed for optimizing the inherent features by coupling F‐S TENG to a capacitor auto‐conversion circuit (CAC). For the first time, a specific idea is proposed explicitly to reduce the output impedance by the management circuit. Eventually, a high current density of 32 A m−2 and a charge density of 1.75 mC m−2 are achieved, which is 8.78 times higher than previous works. The power density and energy density reach to 124 W m−2 and 252 mJ m−2 under 470 and 150 Ω respectively. Then, 5000 LEDs and two lamps rated at 220 V and 50 W are manually illuminated. The resulting pulse output is utilized as a trigger source for the thyristor, enabling DC contactless switching. This work provides a novel approach to realize high‐performance DC output of TENGs and effectively reduce external load impedance.
Genotype and phenotype characterization of primary hypertrophic osteoarthropathy type 2 and chronic enteropathy associated with SLCO2A1: Report of two cases and literature review
Authors: Kimball Tamara N. , Rivero‐García Pamela , Barrera‐Godínez Alejandro , Domínguez‐Cherit Judith 
Published: November 2023

AbstractAutosomal recessive type 2 primary hypertrophic osteoarthropathy (PHOAR2) and chronic enteropathy associated with SLCO2A1 (CEAS) are two entities caused by pathogenic variants (PVs) in the SLCO2A1 gene that can coexist or occur independently from one another. We report two cases of PHOAR2 in Mexico with concomitant CEAS and conducted a review of the literature of the reported cases of PHOAR2 and/or CEAS to analyze the relationship between their genotype and phenotype presentation. The patients from our Institution with classical PHOAR2 phenotype and CEAS, harbored SLCO2A1 c.547G > A and c.1768del variants. We reviewed 232 cases, of which 86.6% were of Asian origin, and identified 109 different variants in SLCO2A1. Intron 7, exon 13, and exon 4 were predominantly affected. The two most common PVs were c.940 + 1G > A and c.1807C > T. We found a statistically significant association between SLCO2A1 variants located in intron 7, exons 12, and 13 and the development of CEAS. Missense variants were more frequent in isolated PHOAR2, while a greater proportion of protein‐truncating variants (PTVs) were found in CEAS. Further investigation is imperative to elucidate the underlying pathophysiological mechanisms associated with CEAS, thereby facilitating the identification of effective therapeutic interventions.
A Mechanistic Understanding of the Distinct Regio‐ and Chemoselectivity of Multifunctional P450s by Structural Comparison of IkaD and CftA Complexed with Common Substrates
Authors: Jiang Peng , Jin Hongbo , Zhang Guangtao , Zhang Wenjun , Liu Wei , Zhu Yiguang , Zhang Changsheng , Zhang Liping 
Published: November 2023

AbstractRegio‐ and chemoselective C−H activation at multi‐positions of a single molecule is fascinating but chemically challenging. The homologous cytochrome P450 enzymes IkaD and CftA catalyze multiple C−H oxidations on the same polycyclic tetramate macrolactam (PoTeM) ikarugamycin, with distinct regio‐ and chemoselectivity. Herein we provide mechanistic understanding of their functional differences by solving crystal structures of IkaD and CftA in complex with ikarugamycin and unnatural substrates. Distinct conformations of the F/G region in IkaD and CftA are found to differentiate the orientation of PoTeM substrates, by causing different binding patterns with polar moieties to determine site selection, oxidation order, and chemoselectivity. Fine‐tuning the polar subpocket altered the regioselectivity of IkaD, indicating that substrate re‐orientation by mutating residues distal to the oxidation site could serve as an important method in future engineering of P450 enzymes.
Phenoxythiazoline (FTz)‐Cobalt(II) Precatalysts Enable C(sp2)–C(sp3) Bond‐Formation for Key Intermediates in the Synthesis of Toll‐like Receptor 7/8 Antagonists**
Authors: Mills L. Reginald , Di Mare Francesca , Gygi David , Lee Heejun , Simmons Eric M. , Kim Junho , Wisniewski Steven R. , Chirik Paul J. 
Published: November 2023

AbstractEvaluation of the relative rates of the cobalt‐catalyzed C(sp2)–C(sp3) Suzuki–Miyaura cross‐coupling between the neopentylglycol ester of 4‐fluorophenylboronic acid and N‐Boc‐4‐bromopiperidine established that smaller N‐alkyl substituents on the phenoxyimine (FI) supporting ligand accelerated the overall rate of the reaction. This trend inspired the design of optimal cobalt catalysts with phenoxyoxazoline (FOx) and phenoxythiazoline (FTz) ligands. An air‐stable cobalt(II) precatalyst, (FTz)CoBr(py)3 was synthesized and applied to the cross‐coupling of an indole‐5‐boronic ester nucleophile with a piperidine‐4‐bromide electrophile that is relevant to the synthesis of reported toll‐like receptor (TLR) 7/8 antagonist molecules including afimetoran. Addition of excess KOMe⋅B(OiPr)3 improved catalyst lifetime due to attenuation of alkoxide basicity that otherwise resulted in demetallation of the FI chelate. A first‐order dependence on the cobalt precatalyst and a saturation regime in nucleophile were observed, supporting turnover‐limiting transmetalation and the origin of the observed trends in N‐imine substitution.
Structure and properties of bio‐based poly(trimethylene terephthalate)/polyamide 56 blends prepared by melt mixing
Authors: Wang Aming , Zhou Xingxing , Li Dawei , Li Haoxuan , Liu Qingsheng , Deng Bingyao , Xu Weilin 
Published: November 2023

AbstractThe extensive use of conventional petroleum‐based polymers consumes large amounts of energy and emits a lot of carbon dioxide. Therefore, the development and popularization of bio‐based polymer materials are highly significant for ecological reasons. Herein, a series of poly(trimethylene terephthalate)/polyamide 56 (PTT/PA56) blends with different weight ratios were prepared by melt blending of two bio‐based polymers, PTT and PA56. The phase structure, miscibility, crystallization and melting behaviors, crystal structure, and mechanical and water absorption properties of PTT/PA56 blend systems were investigated. The results showed that PTT and PA56 were immiscible in the whole range of compositions. The immiscibility of the blend system intensified with the increase of dispersed phase content. As PA56 content increased, tensile strength and elongation at break of samples assumed an increasing trend, whereas impact strength initially remained almost unchanged and then gradually decreased. In contrast, increasing PA56 content gradually increased water absorption of samples. Comprehensive analysis indicated that the best combination of different properties was obtained for the PTT/PA56 blends including 60–80 wt% PA56.
A fully bio‐based monomer derived from undecylenic acid, glycerol, and CO2 useful for the synthesis of polyhydroxyurethanes
Authors: Inciarte Helen C. , Cortés Natalia , Echeverri David A. , Rios Luis A. 
Published: November 2023

AbstractUndecylenic acid, glycerol, and CO2 were used as building blocks for obtaining a fully bio‐based carbonated monomer, useful for polyurethanes. The functionality of the monomer was close to 3 cyclic carbonates/mol, located in terminal positions. In a first stage, a synthetic triglyceride was obtained with 99% selectivity by esterification of glycerol and undecylenic acid at 160°C. The triglyceride was then epoxidized using H2O2 and Amberlyst 15 or Amberlite IR‐120 acidic exchange resins at 57°C. The selectivity to epoxide was kept constant at 98% using Amberlite IR‐120. Terminal cyclic carbonates were then inserted through epoxide moieties under mild conditions by the chemical fixation of CO2 at 80°C and 6 MPa in 6 h. A complete conversion was obtained in 6 h reaction while the selectivity to carbonate groups was near to 99% during all the reaction time. An elastomeric polyhydroxyurethane was obtained by aminolysis of the carbonated monomer with ethylenediamine at 70°C, affording a Young's modulus of 22.6 MPa and Tg of −15.2°C. The material showed a good thermal stability below 240°C.
Charge transfer of 1,3,4‐oxadiazole derivative, its functional polymers and study of their different aggregation‐induced emission enhancement behaviors
Authors: Liu Juan , Xi Jingjing , Mei Xiao , Xu Lingyun , Zhang Youhao , Nie Linhan , Mao Tingting , Lu Zifan , Zha Huiying , Zhou Xuke 
Published: November 2023

AbstractIn this study, a symmetrical D‐π‐A‐π‐D initiator ViOXD, based on substituted amino donor (D) and 1,3,4‐oxadiazole acceptor (A), with rigid stilbene π‐bridge was synthesized. The photophysical investigation of ViOXD in solution and aggregate state showed its solvatochromic and aggregation‐caused quenching characteristics, because of its strong charge transfer and the formation of H‐aggregates, respectively. The introduction of peripheral polystyrene or carbazole‐containing PVPCz chains via atom transfer radical polymerization not only recovered the fluorescence of the ViOXD core, but also tuned its maximum emission wavelength in aggregate state, due to the stronger electron‐donating ability and better conjugation of PVPCz chains than polystyrene chains. On the other hand, the large conjugation length and symmetrical charge transfer from the ends to the cores of ViOXD facilitated the electronic delocalization and bestowed the end‐functionalized polymers with good fluorescence in aggregate state, which we have applied in cellular imaging by preparation of their fluorescent nanoparticles.
Improving student learning and performance through a continuous flipped anatomy teaching model
Authors: Xiao Junhua 
Published: November 2023

AbstractThe flipped classroom teaching model has been widely used in anatomy education to embrace a blended learning strategy. However, the impact that a continuous flipped classroom teaching model exerts on student learning of human topographic anatomy remains unclear. To address this question, student learning experience and performance were compared between third‐year undergraduate students who participated in a continuous flipped anatomy classroom teaching since their first year (n = 65, experimental group) and those under the flipped anatomy teaching model only in their third year (n = 45, control group). A five‐point Likert scale learning and teaching survey was conducted to evaluate students' perceptions of the flipped classroom model. Students under a continuous flipped classroom teaching model rated significantly higher on the impact of the flipped model on learning difficult anatomy concepts than the control group (*p = 0.0346). The rating on independent learning remained not statistically different between the two groups, although a trend difference was detected (p = 0.0604). Analysis of learning performance revealed that the experimental group significantly outperformed the control group when answering questions focusing on regional anatomy (*p = 0.0207). No significant difference was identified in students' marks of case‐based studies between the two groups. In summary, the results of this study indicate that the flipped classroom model implemented over a long term continues to advance students' learning experience and performance in anatomy, indicating a “dose” effect on active learning. The findings of this study will assist the best practices of the flipped anatomy classroom and develop evidence‐informed approaches to advance anatomy education in the future.
Multivariate joint model under competing risks to predict death of hospitalized patients for SARS‐CoV‐2 infection
Authors: Lavalley‐Morelle Alexandra , Peiffer‐Smadja Nathan , Gressens Simon B. , Souhail Bérénice , Lahens Alexandre , Bounhiol Agathe , Lescure François‐Xavier , Mentré France , Mullaert Jimmy 
Published: November 2023

AbstractDuring the coronavirus disease 2019 (COVID‐19) pandemic, several clinical prognostic scores have been proposed and evaluated in hospitalized patients, relying on variables available at admission. However, capturing data collected from the longitudinal follow‐up of patients during hospitalization may improve prediction accuracy of a clinical outcome. To answer this question, 327 patients diagnosed with COVID‐19 and hospitalized in an academic French hospital between January and July 2020 are included in the analysis. Up to 59 biomarkers were measured from the patient admission to the time to death or discharge from hospital. We consider a joint model with multiple linear or nonlinear mixed‐effects models for biomarkers evolution, and a competing risks model involving subdistribution hazard functions for the risks of death and discharge. The links are modeled by shared random effects, and the selection of the biomarkers is mainly based on the significance of the link between the longitudinal and survival parts. Three biomarkers are retained: the blood neutrophil counts, the arterial pH, and the C‐reactive protein. The predictive performances of the model are evaluated with the time‐dependent area under the curve (AUC) for different landmark and horizon times, and compared with those obtained from a baseline model that considers only information available at admission. The joint modeling approach helps to improve predictions when sufficient information is available. For landmark 6 days and horizon of 30 days, we obtain AUC [95% CI] 0.73 [0.65, 0.81] and 0.81 [0.73, 0.89] for the baseline and joint model, respectively (p = 0.04). Statistical inference is validated through a simulation study.
Timing co‐creation: A reward‐based crowdfunding perspective
Authors: Primanti Haryani , Japutra Arnold , van Doorn Sebastiaan , Ekaputra Irwan Adi , Hati Sri Rahayu Hijrah 
Published: November 2023

AbstractReward‐based crowdfunding provides a rich arena for co‐creation, where different types of dialogues between backers and project initiators aid crowdfunding performance. Nevertheless, research on how backers' co‐creation, in the form of comments, influences crowdfunding performance is still scarce. Based on signaling theory, this research investigates the impact of backers' specific co‐creation comments (we coded comments for co‐ideation, co‐evaluation, and co‐design) on crowdfunding performance. The present study also examines whether the timing of posting co‐creation comments influences associated performance benefits. We used a panel dataset of 446 reward‐based crowdfunding projects with 7254 observation days. The results show that backers' co‐ideation and co‐evaluation activity leads to a higher funding amount. Furthermore, the impact of co‐ideation is higher for comments made early in the project's lifecycle, while the effect of co‐design is wholly contingent on the time of commenting, with early co‐design comments contributing negatively to crowdfunding performance.
Kasabach–Merritt Syndrome, an underdiagnosed swollen leg in newborn with anemia and jaundice
Authors: Chap Chariya , Bin Sakviseth 
Published: November 2023

Key Clinical MessageKasabach–Merritt syndrome is a rare disease. Early recognition, timely transfer, and proper management are crucial in reducing bleeding complication and mortality.AbstractThe authors report a rare case of Kasabach–Merritt syndrome in a Cambodian neonate presenting with anemia and jaundice at Day 5 of life. Since the mass was not recognized at birth, the diagnosis and treatment were delayed, thus leading to demise.