bluuebunny/crossref_metadata_2025_split huggingface dataset:
Taguchi design and optimization of the PLA/PCL composite filament with plasticizer and compatibilizer additives for optimal 3D printing
Authors: Yao Ben , Zhu Yalin , Xu Zhining , Wu Yunli , Yang Liang , Liu Jianan , Shang Jianping , Fan Jingyuan , Ouyang Lizhi , Fan Hua‐Jun Shawn 
Published: August 2023

Abstract3D printing (3DP) has brought endless possibilities to the manufacturing industry. Biodegradable high‐polymer materials such as polylactic acid (PLA) and polycaprolactone (PCL) have attracted widespread attention. However, to optimize printing performance, this study prepared six PLA/PCL composite materials with ratios of 4:6, 5:5, and 6:4, by adding Polyethylene Glycol 4000 (PEG 4000) as a plasticizer and nano silica as a reinforcing agent. Parameters that can affect printing quality, including formulation, printing temperature (150, 170, and 190°C), filling density (305, 40%, and 50%), and printing speed (20, 30, and 40 mm/s), were examined and optimized. The optimal factor level combination determined by Taguchi fractional factorial design were silica addition 0.6 g, PLA content 60 wt%, printing temperature 190°C, infill density 50%, and printing speed 20 mm/s. The obtained minimum error value was 0.338 mm. Analysis of variance revealed the statistical significance of PLA content and printing temperature. A general linear model was established for result prediction, showing a difference of 9.25% from the actual error values. SEM results indicated poor compatibility between PLA and PCL in the melt‐blended mixture, while the addition of SiO2 nanoparticles facilitated PCL and PLA crystallization. DSC analysis demonstrated that the incorporation of PLC and SiO2 led to an increase in crystallinity, with 5PLA/5PCL/SiO2 exhibiting the highest crystallinity at 51.4%. Tensile testing results showed that the addition of 50 wt% PCL to PLA significantly improved the fracture elongation of the PLA/PCL material with a 5:5 formulation, averaging about 4 times higher than that of pure PLA, while the tensile strength decreased by 1.5 times. This study not only expands the research on PLA/PCL blends but also provides process guidance for 3D printing of the materials.
Preservice teachers' perspectives and use of behavior management strategies
Authors: McGuire Stacy N. , Meadan Hedda 
Published: August 2023

AbstractMuch of the current literature focuses on how preservice teachers are prepared to support entire classrooms (i.e., classroom management) instead of individual students (i.e., behavior management). Because of this gap in the literature, little is known about how preservice elementary education teachers are prepared to support students who are perceived to engage in challenging behavior in their classrooms. Therefore, the purpose of the current study was to explore preservice elementary education teachers' knowledge, experiences, and needs for using behavior management strategies with individual students. Findings indicated preservice teachers had limited knowledge about behavior management strategies and sought further opportunities to support students who they perceived to engage in challenging behavior.
‘Newell’ bermudagrass: A public release from the USDA Cynodon collection
Authors: Rios E. F. , Lopez Y. , Munoz P. , Dubeux J. C. B. , Vendramini J. M. B. , Wallau M. , Grossman A. J. , Anderson W. , Baxter L. , Harris‐Shultz K. , Castillo M. S. , Saha M. C. , Quesenberry K. , Blount A. , Reith P. , Kenworthy K. 
Published: August 2023

AbstractWarm‐season perennial grasses are the backbone of the pasture‐based livestock industry in the lower southeastern United States, and bermudagrass (Cynodon spp.) is the most widely planted forage species, covering ∼15 million ha. The genus Cynodon is native to southern Africa, and germplasm collections possess high genetic and phenotypic variability. The USDA National Plant Germplasm System maintains a collection of bermudagrass plant introductions (PIs) in Griffin, GA, and USDA‐ARS, Tifton, GA, maintains additional germplasm. Multi‐location trials were established in four states (Florida, Georgia, North Carolina, and Oklahoma) to screen Cynodon germplasm for herbage accumulation (HA), nutritive value (NV), and bermudagrass stem maggot (BSM) (Atherigona reversura Villeneuve). Due to the large genotype × environment interaction for HA, we focused on selecting accessions adapted to South Georgia and Florida, and further studies were performed in Florida. Several PIs showed improved HA and NV compared with ‘Tifton 85’. PI 316510, originally introduced from Ingelheim, Germany, produced high HA in Citra, FL, and Tifton, GA, with improved NV traits. In addition, PI 316510 had faster establishment and similar BSM tolerance to Tifton 85. We confirmed PI 316510 as tetraploid (2n = 4x = 36) through chromosome counts and flow cytometry, and it is genetically distinct from other commercial cultivars. PI 316510 has been publicly released under the name ‘Newell’, and it is vegetatively propagated. Planting material can be requested from the UF‐IFAS Forage Breeding program.
Preparation of polybenzoxazine/resorcinarene composites with low dielectric constants
Authors: Shao Liyan , Yuan Manlin , Lu Xin , Xin Zhong 
Published: August 2023

AbstractA series of polybenzoxazine (PBZ)/resorcinarene composites with low dielectric constants were prepared by the thermal curing of a siloxane‐containing benzoxazine (P‐aptmds) with C‐methylcalix[4]resorcinarene (CMCR). CMCR with active hydroxyl groups could serve to lower the thermal curing temperature of P‐aptmds. The results of differential scanning calorimetry (DSC) showed that the peak exothermic temperature of P‐aptmds decreased from 262°C to 192°C. The introduction of CMCR increased the crosslinking density of the PBZ/CMCR composites and improved the thermal properties. Due to the incorporation of CMCR with macrocyclic structure, the dielectric constant and the dielectric loss of the PBZ/CMCR composite could be reduced to 2.63 and 0.0055 at 1 MHz, respectively. Moreover, the PBZ/CMCR composites possessed good hydrophobicity and low water absorption. This approach was expected to provide a facile design strategy of low dielectric composite materials.
Event‐triggered output feedback control for two‐time‐scale systems with structured uncertainty
Authors: Hua Tong , Lei Yan , Xiao Jiang‐Wen , Wang Yan‐Wu 
Published: August 2023

SummaryThis paper investigates the event‐triggered output feedback control problem for the two‐time‐scale systems with structured uncertainty. Due to the non‐ignorable problem in applications such as equipment aging or parameter drifting, the robustness of the designed controller is worth discussing. A dynamic event‐triggered scheme is proposed to reduce the computational cost of the control signal. The results indicate that with the proposed event‐triggered controller, the system can achieve asymptotic stability without some common restrictions on the fast system rather than practical stability. Moreover, the Zeno behavior is excluded. Simulation examples with comparison studies illustrate the effectiveness of the proposed method.
Small, Dynamic Clusters of Tir‐Intimin Seed Actin Polymerization
Authors: Oh Dongmyung , Liu Xuyao , Sheetz Michael P. , Kenney Linda J. 
Published: August 2023

AbstractThe understanding of actin pedestal formation by enteropathogenic Escherichia coli (EPEC) relies mainly on static ensemble information obtained from cell lysates. Here, the dynamic nature of signaling components on the subsecond timescale, which resemble phase condensates, is demonstrated. Unlike in vitro phase condensates, transfected intimin receptor (Tir) and downstream component form clusters 200 nm in diameter that are spaced ≈500 nm on average, indicating cellular regulation. On supported lipid bilayers with diffusive intimin, Tir‐expressing fibroblasts formed Tir‐intimin clusters even without Tir tyrosines, although Tir tyrosine phosphorylation is necessary for actin polymerization from clusters. Single‐molecule tracking showed that Tir is diffusive in the clusters and exchanges with Tir in the plasma membrane. Further, Nck and N‐WASP bind to the clusters and exchange with cytoplasmic molecules. Tir has a similar cluster lifetime to Nck, but longer than that of N‐WASP. Actin polymerization from the clusters requires N‐WASP binding, involved Arp2/3 activation, and stabilized N‐WASP clusters. These dynamic properties are distinct from larger in vitro systems and do not depend significantly upon crosslinking. Thus, Tir‐intimin clusters in the plasma membrane are limited in size by exchange and enhance signaling needed for actin polymerization that enables strong and stable bacterial attachment to host cells.
Neoantigen‐Based Nanovaccine In Combination with Immune Checkpoint Inhibitors Abolish Postsurgical Tumor Recurrence and Metastasis
Authors: Zheng Peng , He Jinrong , Yang Zhongqian , Fu Yuting , Yang Ying , Li Weiran , Ding Yiting , Yang Xu , Ma Yanbing 
Published: August 2023

AbstractThe notorious limitation of conventional surgical excision of primary tumor is the omission of residual and occult tumor cells, which often progress to recurrence and metastasis, leading to clinical treatment failure. The therapeutic vaccine is emerging as a promising candidate for dealing with the issue of postsurgical tumor residuals or nascent metastasis. Here, a flexible and modularized nanovaccine scaffold based on the SpyCatcher003‐decorated shell (S) domain of norovirus (Nov) is employed to support the presentation of varied tumor neoantigens fused with SpyTag003. The prepared tumor neoantigen‐based nanovaccines (Neo‐NVs) are able to efficiently target to lymph nodes and engage with DCs in LNs, triggering strong antigen‐specific T‐cell immunity and significantly inhibiting the growth of established orthotopic 4T1 breast tumor in mice. Further, the combination of Neo‐NVs and anti‐PD‐1 monoclonal antibody (mAb) produces significant inhibition on postsurgical tumor recurrence and metastasis and induces a long‐lasting immune memory. In conclusion, the study provides a simple and reliable strategy for rapid preparing personalized neoantigens‐based cancer vaccines and engaging checkpoint treatment to restore the capability of tumor immune surveillance and clearance in surgical patients.
Greatly Intensified Guest Exchange Strategy for Highly‐Efficient Activation of Metal–Organic Frameworks
Authors: Wei Yan , Chang Miao , Yun Ling‐Xia , Qiao Meng , Liu Rong‐Kun , Liu Dahuan , Wang Jie‐Xin , Chen Jian‐Feng 
Published: August 2023

AbstractThe preservation and accessibility of pores are prerequisites to the application of metal–organic frameworks (MOFs). Activation is a key step to eliciting rich features of pores, but it needs a repeated solvent‐exchange process which is tedious and time/cost‐consuming. Herein, a facile strategy for highly‐efficient activation of MOFs utilizing rotating packed bed is proposed. With the tremendous enhancement of molecular mixing and mass transfer in high‐gravity and strong‐shearing surrounding, nine representative MOFs are completely activated within 2 h without structural change. Compared with conventional process, this activation displays surprising efficiency by accelerating the diffusion of solvents and redissolution of residual reactants in the pores. The complete activation time can be significantly shortened by over 90%. As a proof‐of‐concept, the methane storage of as‐activated UiO‐66 is five times that of as‐synthesized UiO‐66. This strategy provides a potential platform with industrial worth for the activation of MOF materials with ultra‐high efficiency and versatility.
Construction of Co2P‐Ni3S2/NF Heterogeneous Structural Hollow Nanowires as Bifunctional Electrocatalysts for Efficient Overall Water Splitting
Authors: Li Hangxuan , Gao Xiaolan , Li Ge 
Published: August 2023

AbstractDesigning efficient and stable transition metal‐based catalysts for electrocatalytic water splitting is vital for the development of hydrogen production. Herein, a facile synthetic strategy is developed to fabricate transition metal‐based heterogeneous structural Co2P‐Ni3S2 hollow nanowires supported on nickel foam (Co2P‐Ni3S2/NF). Owing to the multiple active sites provided by transition metal compounds, large surface area of the unique hollow nanowire morphology, and the synergistic effect of Co2P‐Ni3S2 heterostructure interfaces, Co2P‐Ni3S2/NF requires ultralow overpotentials of 110, 164 mV for HER and 331.7, 358.3 mV for OER at large current densities of 100, 500 mA cm−2 in alkaline medium, respectively. Importantly, the two‐electrode electrolyzer assembled by Co2P‐Ni3S2/NF displays a cell voltage of 1.54 V at 10 mA cm−2 and operates stably over 24 h at 100 mA cm−2, which performs better than reported transition metal‐based bifunctional electrocatalysts. This work presents a successful fabrication of transition metal‐based bifunctional HER/OER electrocatalysts at large‐current density and brings new inspiration for developing applicable energy conversion materials.
Shear‐Responsive Sol–Gel Transition of Phase Change Material Emulsions for an Injectable Thermal Insulation Platform
Authors: Sun Junrui , Yang Jongryeol , Jeon Dongyoung , Park Daehwan , Kim Jin Woong 
Published: August 2023

AbstractPhase change materials (PCMs) have attracted significant attention as promising insulating materials. However, they often suffer from the simple yet critical problem of leakage in practical applications. Therefore, in this study, an injectable PCM emulsion insulation platform is developed. For this, n‐hexadecane, as a PCM, emulsion droplets are armored with a metal‐organic membrane (MOM) through the coordination of zinc ions and phytic acid. The MOM layer not only provides a rigid interfacial modulus but also allows the emulsion to exhibit viscoelastic behavior by shear stress‐induced interdrop association. This MOM‐enveloped PCM emulsion (PCMEMOM) exhibited typical sol–gel transition behavior in response to applied shear stress, indicating the injectable characteristic of the PCMEMOM. After observing the rheological hysteresis and thermal stability of the PCMEMOM under repetitive heating and cooling cycles, the thermal insulation performance of PCMEMOM is quantitatively and visually demonstrated. These findings suggest an efficient method to exploit high‐performance insulation systems.
A Rotating Triboelectric Nanogenerator Driven by Bidirectional Swing for Water Wave Energy Harvesting
Authors: Zhang Chuguo , Yuan Wei , Zhang Baofeng , Yang Jiayi , Hu Yuexiao , He Lixia , Zhao XueJiao , Li Xiuhan , Wang Zhong Lin , Wang Jie 
Published: August 2023

AbstractDue to the simple installation and convenient maintenance, the floating water wave energy harvesting devices have significant economic advantages. Mass power density is the most important index to evaluate the advancement of floating wave energy harvesting devices. Herein, a self‐adaptive rotating triboelectric nanogenerator (SR‐TENG) with a compound pendulum and a functional gear‐set is provided for wave energy harvesting. First, a compound pendulum structure with a low center of gravity and high moment of inertia is obtained by the geometric design and mechanical study. Besides, compared with the previous triboelectric nanogenerator with one‐way clutch, SR‐TENG can harvest twice the kinetic energy utilization through the functional gear‐set. Importantly, depending on the structure design, the SR‐TENG obtains the average mass power density of 45.18 mW kg−1 under low frequency driving conditions, which is about 10 times the reference electromagnetic generator with a similar structure and size. This result shows that the SR‐TENG has a significant advantage in small water wave energy harvesting. These findings provide an important example of the floating water wave energy harvesting devices.
Carbonized Polymer Dots for Controlling Construction of MoS2 Flower‐Like Nanospheres to Achieve High‐Performance Li/Na Storage Devices
Authors: Al‐Ansi Nabilah , Salah Abdulwahab , Drmosh Qasem Ahmed , Yang Guo‐Duo , Hezam Abdo , Al‐Salihy Adel , Lin Jian , Wu Xing‐Long , Zhao Liang , Zhang Jing‐Ping , Wang Shao‐lei , Sun Hai‐Zhu 
Published: August 2023

AbstractDespite being one of the most promising materials in anode materials, molybdenum sulfide (MoS2) encounters certain obstacles, such as inadequate cycle stability, low conductivity, and unsatisfactory charge‐discharge (CD) rate performance. In this study, a novel approach is employed to address the drawbacks of MoS2. Carbon polymer dots (CPDs) are incorporated to prepare three‐dimensional (3D) nanoflower‐like spheres of MoS2@CPDs through the self‐assembly of MoS2 2D nanosheets, followed by annealing at 700 °C. The CPDs play a main role in the creation of the nanoflower‐like spheres and also mitigate the MoS2 nanosheet limitations. The nanoflower‐like spheres minimize volume changes during cycling and improve the rate performance, leading to exceptional rate performance and cycling stability in both Lithium‐ion and Sodium‐ion batteries (LIBs and SIBs). The optimized MoS2@CPDs‐2 electrode achieves a superb capacity of 583.4 mA h g−1 at high current density (5 A g−1) after 1000 cycles in LIBs, and the capacity remaining of 302.8 mA h g−1 after 500 cycles at 5 A g−1 in SIBs. Additionally, the full cell of LIBs/SIBs exhibits high capacity and good cycling stability, demonstrating its potential for practical application in fast‐charging and high‐energy storage.
Mesoporous Carbon for High‐Performance Near‐Neutral Zinc–Air Batteries
Authors: Wang Fengmei , Qiu Ke , Zhang Wei , Zhu Kerun , Chen Jiawei , Liao Mochou , Dong Xiaoli , Wang Fei 
Published: August 2023

AbstractNear‐neutral zinc–air batteries (ZABs) have garnered significant research interest due to their high energy density, exceptional electrochemical reversibility, and adaptability to ambient air. However, these batteries suffer from substantial electrochemical polarization, low energy efficiency, and poor rate performance. In this study, a mesoporous carbon (meso‐C) with a high specific surface area (1081 m2 g−1) and abundant porous structure for the cathode of near‐neutral ZABs using a scalable synthesis method is prepared. The meso‐C‐based cathode is endowed with stable hydrophobicity and abundant electrochemical active sites, which considerably improve the energy efficiency, rate performance, and cycle life of the battery compare to commercial carbon black‐based cathode when applied to near‐neutral ZABs with 1 mol kg−1 (1 m) zinc acetate and 1 m zinc trifluoromethanesulfonate electrolytes. Additionally, the mesopores of meso‐C facilitate the construction of better three‐phase reaction interfaces and contribute to better electrochemical reversibility. The work presents a general and scalable approach for carbon materials in the cathode of near‐neutral ZABs.
Competitive Formation Mechanism for Bidentate Passivation of Halogen Vacancies in Perovskite Based on 6‐Chloropurine
Authors: He Jingshan , He Jingwen , Ma Dun , Sheng Jie , Shao Wu , Ding Tian , Wu Wenjun 
Published: August 2023

AbstractFor metal halide perovskite solar cells, bidentate passivation (BP) is highly effective, but currently, only passivation sites rather than molecular environments are being considered. Here, the authors report an effective approach for high‐performance fully printable mesoscopic perovskite solar cells (FP‐PSCs) through the BP strategy using the multidentate molecule 6‐chloropurine (6‐CP). By utilizing density functional theory (DFT) calculations, X‐ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR) characterizations, the competition mechanism is identified of BP between the chlorine atom and neighboring nitrogen atom of the imidazole and pyrimidine rings. Through BP between the chlorine atom and adjacent nitrogen atom in imidazole, the power conversion efficiency (PCE) of the pristine samples is significantly enhanced from 16.25% to 17.63% with 6‐CP. The formation of BP enhances interfacial hole selectivity and charge transfer, and suppresses nonradiative recombination, improving device stability under high humidity conditions. The competition mechanism of BP between two aromatic cycles provides a path for designing molecular passivants and selecting passivation pathways to approach theoretical limits.
Pyrolysis of Al‐Based Metal–Organic Frameworks to Carbon Dot‐Porous Al2O3 Composites With Time‐Dependent Phosphorescence Colors for Advanced Information Encryption
Authors: Zhang Longyue , Chen Xipao , Hu Yaoping 
Published: August 2023

AbstractPhosphorescent materials with time‐dependent phosphorescence colors (TDPCs) have great potential in advanced optical applications. Synthesis of such materials is attractive but challenging. Here, a series of carbon dot‐porous Al2O3 composites exhibiting distinctive TDPC characteristics is prepared by high‐temperature pyrolysis of Al‐based metal–organic frameworks NH2‐MIL‐101(Al). The composite synthesized at 700 °C (CDs@Al2O3‐700) shows an obvious change in phosphorescence color from blue to green after removing the excitation light of 280 nm. Photophysical analysis reveals that two emission centers in CDs, namely carbon core and surface states, are responsible for the short‐lived blue phosphorescence (96 ms) and long‐lived green phosphorescence (911 ms), respectively. The combination of blue and green phosphorescence with different decay rates triggering the interesting TDPC phenomenon. CDs@Al2O3‐700 has a significantly high phosphorescence quantum yield of up to 41.7% and possesses an excellent optical stability against water, organic solvents, and strong oxidants, which benefits from the multi‐confinement of CDs by the porous Al2O3 matrix through rigid network, strong space constraint, and stable covalent bonding. Based on the TDPC property, multilevel coding patterns composed of CDs@Al2O3 are successfully fabricated for advanced dynamic information encryption.
Strongly Localized Moiré Exciton in Twisted Homobilayers
Authors: Qian Wenqi , Qi Pengfei , Dai Yuchen , Shi Beibei , Tao Guangyi , Liu Haiyi , Zhang Xubin , Xiang Dong , Fang Zheyu , Liu Weiwei 
Published: August 2023

AbstractArtificially molding exciton flux is the cornerstone for developing promising excitonic devices. In the emerging hetero/homobilayers, the spatial separated charges prolong exciton lifetimes and create out‐plane dipoles, facilitating electrically control exciton flux on a large scale, and the nanoscale periodic moiré potentials arising from twist‐angle or/and lattice mismatch can substantially alter exciton dynamics, which are mainly proved in the heterostructures. However, the spatially indirect excitons dynamics in homobilayers without lattice mismatch remain elusive. Here the nonequilibrium dynamics of indirect exciton in homobilayers are systematically investigated. The homobilayers with slightly twist‐angle can induce a deep moiré potential (>50 meV) in the energy landscape of indirect excitons, resulting in a strongly localized moiré excitons insulating the transport dynamics from phonons and disorder. These findings provide insights into the exciton dynamics and many‐body physics in moiré superlattices modulated energy landscape, with implications for designing excitonic devices operating at room temperature.