bluuebunny/crossref_metadata_2025_split huggingface dataset:
Supercritical CO2 Extraction From Leptocarpha rivularis Stalks Using Box–Behnken Design
Authors: Uquiche Edgar , Cayupán Edith , Marillán Claudia , Sepúlveda Paulina 
Published: September 2024

AbstractThe effect of temperature, pressure, and specific solvent consumption on extraction yield from Leptocarpha rivularis stalks was studied using a Box–Behnken design. The effect of pressure on extraction yield was the most important, followed by temperature and specific solvent consumption (p ≤ 0.05). The extraction yield correlated (p ≤ 0.05) positively with the CO2 density. A diffusion model adequately described the cumulative extraction curve with the highest yield at the selected extraction condition. The inhibition of linoleic acid oxidation and the inhibition of lipoxygenase enzyme were higher in the supercritical (SC) extract than in the hydroethanolic extract. SC extraction could be used to isolate compounds from L. rivularis stalks with functional value.
Heteroatom‐induced tensile strain in copper lattice boosts CO2 electroreduction toward multi‐carbon products
Authors: Zhai Zhiyang , Li Deliang , Lu Xin , Cai Huizhu , Hu Qi , Yang Hengpan , He Chuanxin 
Published: September 2024

AbstractStrain engineering on metal‐based catalysts has been utilized as an efficacious strategy to regulate the mechanism and pathways in various electrocatalytic reactions. However, controlling strain and establishing the strain‐activity relationship still remain significant challenges. Herein, three different and continuous tensile strains (CuPd‐1.90%, CuAu‐3.37%, and CuAg‐4.33%) are successfully induced by introducing heteroatoms with different atomic radius. The catalytic performances of CuPd‐1.90%, CuAu‐3.37%, and CuAg‐4.33% display a positive correlation against tensile strains in electrochemical CO2 reduction reaction (CO2RR). Specifically, CuAg‐4.33% exhibits superior catalytic performance with a 77.9% Faradaic efficiency of multi‐carbon products at −300 mA cm−2 current density, significantly higher than those of pristine Cu (Cu‐0%). Theoretical calculations and in situ spectroscopies verify that tensile strain can affect the d‐band center of Cu, thereby altering the binding energy of *CO intermediates and Gibbs free energies of the C–C coupling procedure. This work might highlight a new method for precisely regulating the lattice strain of metallic catalysts in different electrocatalytic reactions.
Microwave‐Assisted One‐Step Synthesis of Palladium‐Encapsulated Covalent Organic Frameworks for Heterogeneous Catalysis
Authors: Alsudairy Ziad , Campbell Allea , Zheng Qi , Harrod Chelsea , Brown Normanda , Saintilma Allison , Maligal‐Ganesh Raghu V. , Ingram Conrad , Li Xinle 
Published: September 2024

AbstractMetal‐encapsulated covalent organic frameworks (metal/COFs) represent an emerging paradigm in heterogeneous catalysis. However, the time‐intensive (usually 4 or more days) and tedious multi‐step synthesis of metal/COFs remains a significant stumbling block for their broad application. To address this challenge, we introduce a facile microwave‐assisted in situ metal encapsulation strategy to cooperatively combine COF formation and in situ palladium(II) encapsulation in one step. With this unprecedented approach, we synthesize a diverse range of palladium(II)‐encapsulated COFs (termed Mw‐Pd/COF) in the air within just an hour. Notably, this strategy is scalable for large‐scale production (~0.5 g). Leveraging the high crystallinity, porosity, and structural stability, one representative Mw‐Pd/COF exhibits remarkable activity, functional group tolerance, and recyclability for the Suzuki‐Miyaura coupling reaction at room temperature, surpassing most previously reported Pd(II)/COF catalysts with respect to catalytic performance, preparation time, and synthetic ease. This microwave‐assisted in situ metal encapsulation strategy opens a facile and rapid avenue to construct metal/COF hybrids, which hold enormous potential in a multitude of applications including heterogeneous catalysis, sensing, and energy storage.
N‐doped and Bowl‐Shaped Azabenzo[3,4]azulenofluorene: Synthesis and Characterization of Bridged Aza‐Triarylamines
Authors: Radolko Jan , Tuan Ha Minh , Molenda Ricardo , Villinger Alexander , Ehlers Peter , Langer Peter 
Published: September 2024

AbstractTriarylamines are frequently employed as electron donor functional groups in a variety of organic electronic materials. We herein report the synthesis and in‐depth characterisation of aza‐analogues of fully bridged triarylamines, consisting of 5‐, 6‐ and 7‐membered rings. The impact of nitrogen doping and π‐extension on the structural, electronic and optical‐properties of these contorted heteroaromatic PAHs is thoroughly investigated and paves the way for an improved understanding of the structure‐property relationships.
Lights on the Synthesis of Surfactant‐Free Colloidal Gold Nanoparticles in Alkaline Mixtures of Alcohols and Water
Authors: Røjkjær Rasmussen Ditte , Lock Nina , Quinson Jonathan 
Published: September 2024

AbstractSurfactant‐free colloidal syntheses in aqueous media are attractive to develop nanomaterials relevant for various applications, e. g. catalysis or medicine. However, controlled green syntheses without surfactants of metal nanoparticles in aqueous media remain scarce. Here, room temperature syntheses of gold (Au) nanoparticles (NPs) that require only HAuCl4, alkaline water and an alcohol, i. e. relatively benign chemicals and mild reaction conditions, are developed. The findings of a comprehensive multi‐parameters screening performed in small volumes (<3 mL) over 1000+ experiments pave the way to greener high throughput screenings of large parametric spaces and lead to scalable (100 mL) synthetic strategies. A rational selection of the alcohol is proposed. The influence of lights with defined wavelengths (222–690 nm) is investigated. It is found that lights with lower wavelengths favor the formation of smaller 5 nm NPs. Different kinetics and formation pathways are observed for different alcohols and for lights with different wavelengths. The sensitivity to various experimental parameters increases with the alcohol used in the order glycerol<ethylene glycol<ethanol<methanol. New strategies for a rational fine size control, and to some extend shape control, are identified. The results lead to more sustainable and reproducible surfactant‐free colloidal syntheses of NPs.
FPGA‐Based Implementation of Real‐Time Cardiologist‐Level Arrhythmia Detection and Classification in Electrocardiograms Using Novel Deep Learning
Authors: Chandrasekaran Saravanakumar , Chandran Srinivasan , Selvam Immaculate Joy 
Published: September 2024

ABSTRACTCardiac arrhythmia refers to irregular heartbeats caused by anomalies in electrical transmission in the heart muscle, and it is an important threat to cardiovascular health. Conventional monitoring and diagnosis still depend on the laborious visual examination of electrocardiogram (ECG) devices, even though ECG signals are dynamic and complex. This paper discusses the need for an automated system to assist clinicians in efficiently recognizing arrhythmias. The existing machine‐learning (ML) algorithms have extensive training cycles and require manual feature selection; to eliminate this, we present a novel deep learning (DL) architecture. Our research introduces a novel approach to ECG classification by combining the vision transformer (ViT) and the capsule network (CapsNet) into a hybrid model named ViT‐Cap. We conduct necessary preprocessing operations, including noise removal and signal‐to‐image conversion using short‐time Fourier transform (SIFT) and continuous wavelet transform (CWT) algorithms, on both normal and abnormal ECG data obtained from the MIT‐BIH database. The proposed model intelligently focuses on crucial features by leveraging global and local attention to explore spectrogram and scalogram image data. Initially, the model divides the images into smaller patches and linearly embeds each patch. Features are then extracted using a transformer encoder, followed by classification using the capsule module with feature vectors from the ViT module. Comparisons with existing conventional models show that our proposed model outperforms the original ViT and CapsNet in terms of classification accuracy for both binary and multi‐class ECG classification. The experimental findings demonstrate an accuracy of 99% on both scalogram and spectrogram images. Comparative analysis with state‐of‐the‐art methodologies confirms the superiority of our framework. Additionally, we configure a field‐programmable gate array (FPGA) to implement the proposed model for real‐time arrhythmia classification, aiming to enhance user‐friendliness and speed. Despite numerous suggestions for high‐performance FPGA accelerators in the literature, our FPGA‐based accelerator utilizes optimization of loop parallelization, FP data, and multiply accumulation (MAC) unit. Our accelerator architecture achieves a 57% reduction in processing time and utilizes fewer resources compared to a floating‐point (FlP) design.
Metal‐Halide–Melem Compounds Based on M6‐, M9‐ and M12‐Clusters
Authors: Ströbele Markus , Enseling David , Jüstel Thomas , Abbasi Mojtaba , Kroeker Scott , Meyer Hans‐Jürgen 
Published: September 2024

AbstractM9‐ and M12‐metal clusters appear as face‐sharing double‐clusters in (Pb9Br19)2(Pb1.5Br2)2(melem)3 (6) and as triple‐clusters in (Pb12Br25)4(Pb1.67Br2)3(melem)4 (7). All compounds are characterized by single‐crystal and powder X‐ray diffraction, and further validated by infrared (IR) spectroscopy and 207Pb and 79/81Br NMR studies on (5). Photoluminescence studies on compound (6) reveal emission at 430 nm while the emission of (5) is completely quenched.
Isomerism in Phenyl 2‐Pyridyl Ketoxime Metal Complexes
Authors: Hirva Pipsa , Jääskeläinen Sirpa , Ollikainen Meeri , Ofori Albert , Koshevoy Igor O. 
Published: September 2024

AbstractThe octahedral complex [RhCl2(ppkoH)(ppko)] (1) was obtained from the reaction between RhCl3 and phenyl 2‐pyridyl ketoxime (ppkoH). Attempts to prepare the corresponding octahedral platinum compound from K2PtCl6 gave instead the square planar [Pt2+(ppko)2] (2), but when the halogen was changed to bromine, the octahedral [Pt4+Br2(ppko)2] (3) was formed. The crystal structures were determined by X‐Ray crystallography. All the compounds have two N,N‐chelating oxime ligands. In 1, one of them is deprotonated, while in 2 and 3 both ligands are deprotonated. Compounds 1 and 3 have two halogen ligands in trans position. In 1 the oxime groups are situated mutually in cis position with an intramolecular hydrogen bond between the two N−O(H) groups. The formation of 2 involves reduction of the platinum metal and the complex has oximes in trans position to each other. Compound 3 has an all‐trans geometry. Since octahedral and square planar compounds have a possibility to isomerism, we studied the relative stability of different geometries by DFT calculations. A mixture of isomers is likely to be formed in the reactions, but the most stable form was found to crystallize. The properties of the electron density in the preferred isomers were also investigated via QTAIM methods.
Developmental Validation of the Microreader 23HS Plex ID System: A Novel Supplementary Non‐CODIS STR Multiplex Assay for Forensic Application
Authors: Li Hui , Ren He , Yang Fan , Chen Man , Sun Weifen , Jiang Lei , Gao Zhixiao , Liu Yacheng , Liu Xiling 
Published: September 2024

ABSTRACTA novel supplementary non‐CODIS STR multiplex assay designated as the “Microreader 23HS Plex ID System” was developed. The Microreader 23HS Plex ID System enables simultaneous profiling of 23 STR loci and the amelogenin locus. The majority of these loci are non‐CODIS STRs (D4S2408, D9S2157, D20S161, D3S2459, D18S1364, D13S305, D1S2142, D19S400, D6S1017, D7S1517, D2S1776, D2S1360, D3S1744, D16S3391, D3S1545, D11S4463, D20S85, D1S549, D10S2325, D21S2055), with the exception of three CODIS STRs (D2S441, D12S391, and D22S1045). Followed the recommendations of Scientific Working Group on DNA Analysis Methods (SWGDAM) and the Chinese validation standards, a comprehensive set of validation studies were conducted, encompassing PCR conditions, stutter ratio and peak height balance, sensitivity, precision and accuracy, reproducibility, species specificity, inhibition, as well as mixture testing. The results demonstrated that the Microreader 23HS Plex ID System is a reliable and robust assay, with well‐balanced peak heights, high precision and accuracy, species specificity, and resistance to common inhibitors. The sensitivity of the assay was determined to be 0.125 ng of template DNA. In mixture study, all minor alleles were detected in two‐sample mixtures across various ratios (1:19, 1:9, 1:4, 3:7, 2:3, 1:1, 3:2, 4:1, 9:1, and 19:1). In population study, a total of 500 unrelated individuals of Han ethnicity from East China were genotyped. The allele frequencies and forensic population genetic parameters were calculated, with a cumulative random match probability of 7.757 × 10−27, and a total power of discrimination exceeding 0.999,999,999,999,999,999,999,999,99. In conclusion, the Microreader 23HS Plex ID System shows promise as a valuable supplementary tool for forensic applications, particularly in addressing complex kinship testing and challenges posed by STR mutation.
On the mechanical behavior of polymeric lattice structures fabricated by stereolithography 3D printing
Authors: Malekan Mohammad , Sigurjónsson Bragi 
Published: September 2024

AbstractThe utilization of 3D printing technology has transformed the possibilities for design adaptability and manufacturability. This study delves into the mechanical response and energy absorptivity of resin‐based lattice structures when subjected to compression, specifically examining structures fabricated from Tough 2000 (ductile) and Rigid 10K (brittle) resin materials using a stereolithography 3D printer. The analysis encompasses various types of lattice designs (such as cubic‐primitive, circular, triangular, and hexagonal), gradient structures, and combined shape configurations with varying strut dimensions. The primary objective is to provide significant findings regarding the compressive performance of these resin lattice structures produced through 3D printing. Analysis results show that graded and combined lattice designs have better compressive behavior compared to regular shapes with the same strut thickness. In addition, and for strut thickness of 0.5 mm, combined lattice designs show better energy absorption capabilities compared to regular shapes.
A robust approach to satellite image encryption using chaotic map and circulant matrices
Authors: Kanwal Shamsa , Inam Saba , Shah Asghar Ali , Iqbal Halima , Bilal Anas , Hashmi Muhammad Usman , Sarwar Raheem 
Published: September 2024

AbstractIn the modern era, where satellite imagery is vital for applications like ecological monitoring and national security, ensuring the safety and integrity of these data repositories is crucial. This study presents an improved satellite image encryption technique that combines the cryptographic strength of the circulant matrix in the Hill cipher with the dynamic characteristics of the hyperbolic tangent tent map, further enhanced by the Kronecker XOR product. The algorithm initiates with computing alterations by a shift amount. After preserving the leftmost pixel in each row, it executes XOR operations between alternating rows, combining the value of the current even or odd row with corresponding pixels in the adjacent rows followed by encryption using the Hill cipher. The resulting image undergoes a diffusion process utilizing a hyperbolic tangent tent map. The Kronecker XOR product operation is then applied to individual pixels to produce a secure image followed by additional diffusion with keys from the hyperbolic tangent tent map to achieve the final encrypted image. We conducted simulations using MATLAB to assess the efficiency of the proposed satellite image encryption from theoretical and statistical perspectives. The results exhibit robust encryption performance as demonstrated by metrics such as an entropy value of 7.9982, a UACI of 33.5333%, and an NPCR of 99.6038%. The experiment results demonstrate the proposed image encryption scheme's reliability, practicability, and efficiency in securing satellite images during data storage and transmission. Comprehensive testing against various attacks including correlation, histogram, chi‐square, NPCR, PSNR, UACI, SSIM, key space and key sensitivity analysis confirms the scheme's robustness, efficiency and speed. These findings verify the scheme's ability to come across the most stringent encryption and decryption standards, making it an effective solution for securing sensitive satellite image data.
Developmental maturation and regional heterogeneity but no sexual dimorphism of the murine CNS myelin proteome
Authors: Siems Sophie B. , Gargareta Vasiliki‐Ilya , Schadt Leonie C. , Daguano Gastaldi Vinicius , Jung Ramona B. , Piepkorn Lars , Casaccia Patrizia , Sun Ting , Jahn Olaf , Werner Hauke B. 
Published: September 2024

AbstractThe molecules that constitute myelin are critical for the integrity of axon/myelin‐units and thus speed and precision of impulse propagation. In the CNS, the protein composition of oligodendrocyte‐derived myelin has evolutionarily diverged and differs from that in the PNS. Here, we hypothesized that the CNS myelin proteome also displays variations within the same species. We thus used quantitative mass spectrometry to compare myelin purified from mouse brains at three developmental timepoints, from brains of male and female mice, and from four CNS regions. We find that most structural myelin proteins are of approximately similar abundance across all tested conditions. However, the abundance of multiple other proteins differs markedly over time, implying that the myelin proteome matures between P18 and P75 and then remains relatively constant until at least 6 months of age. Myelin maturation involves a decrease of cytoskeleton‐associated proteins involved in sheath growth and wrapping, along with an increase of all subunits of the septin filament that stabilizes mature myelin, and of multiple other proteins which potentially exert protective functions. Among the latter, quinoid dihydropteridine reductase (QDPR) emerges as a highly specific marker for mature oligodendrocytes and myelin. Conversely, female and male mice display essentially similar myelin proteomes. Across the four CNS regions analyzed, we note that spinal cord myelin exhibits a comparatively high abundance of HCN2‐channels, required for particularly long sheaths. These findings show that CNS myelination involves developmental maturation of myelin protein composition, and regional differences, but absence of evidence for sexual dimorphism.
H‐2A workers' preferences for job attributes: Evidence from an experiment
Authors: Gallardo Karina , Gutiérrez‐Li Alejandro , Luckstead Jeffrey , Nayga Rodolfo M. , Sallato Bernardita , Yang Wei 
Published: September 2024

AbstractDiminishing labor availability is a pressing issue for US farmers. We surveyed H‐2A farmworkers and conducted a discrete choice experiment to estimate their willingness to accept different job benefits. Respondents identified the opportunity to return home as the most valuable perk. The second highest valued job attribute was training in both English and machinery operation, followed by the employer offering housing amenities. The least valued benefit was the opportunity to earn overtime pay. This study provides new insights about the type of program modifications that might be valued more by workers in the context of proposals to modify labor rules.
The work environment and hospitalist work well‐being and burnout
Authors: Warner Megan E. , Weinstein Ali A. , Venkatesan Chalapathy , de Avila Leyla , Taori Maansi , Younossi Zobair M. 
Published: September 2024

AbstractBackgroundHospital medicine is the largest growing specialty in the United States. It is important to understand factors that are related to burnout and work well‐being (WWB), both predictors of workforce retention.ObjectiveTo examine the relationship between work environment factors and hospitalist burnout and WWB.MethodsAn online cross‐sectional survey was completed by hospitalists in July–October 2020. Burnout was assessed using the Mini‐Z burnout scale and the Abbreviated Maslach Burnout Inventory. WWB was assessed using the Work Well‐Being Scale. Work structure variables included hours worked per week, frustration at work, safety level of clinical workload, lack of control over schedule, lack of control over daily work, continuity of patient care, and ability to optimize license. The current desire to practice medicine was also examined.ResultsEight‐eight hospitalists participated. There were statistically significant differences between levels of safety of workload (F(2,85) = 9.70, p = <.005), frustration at work (F(2,85) = 12.29, p = <.005), control over schedule (F(2,85) = 3.17, p = .04), control over daily work (F(2,85) = 6.17, p = .003), and desire to practice medicine (F(2,85) = 42.34, p = <.005) with WWB. There were statistically significant associations between the presence of burnout and the safety of workload (χ2 = 8.167, p = .017), frustration at work (χ2 = 15.29, p = .005), control over daily work (χ2 = 12.48, p = .002), and desire to practice medicine (χ2 = 7.12, p = .03). WWB was positively associated with years as a hospitalist (r = .249, p = .02)).ConclusionWork environment factors are associated with WWB and burnout. Modifiable work environment factors may offer a point of intervention for reducing burnout and enhancing WWB among hospitalists.
Changes in the soil microbial community 5 years after the application of sewage sludge biochar to soils cultivated with corn
Authors: Cruz André Freire , Borges Lurdineide de Araújo Barbosa , Gomes Mateus Oliveira , de Figueiredo Cícero Célio 
Published: September 2024

AbstractBackgroundSewage sludge biochar has been widely used in agriculture for various purposes; however, knowledge about its residual effect on the soil microbial community is limited.AimsThis study aimed to evaluate changes in the microbial community 5 years after the application of sewage sludge biochar.MethodsBiochar was produced from sewage sludge obtained at a wastewater treatment pyrolyzed at 300°C (Biochar300) and 500°C (Biochar500). Both biochar treatments were applied in corn fields for two growing seasons (2014/2015; 2015/2016). Biochar was not applied from the third (2016/2017) to the seventh (2020/2021) growing season to assess the residual effect. Soil samples were collected after harvesting in 2020/2021 growing season, therefore in the fifth year subject to the residual effects of biochar. The microbial community was evaluated by accessing bacterial and fungal groups using DNA techniques. Amplicon sequencing analysis was performed with the samples by Illumina MiSeq 250 bp.ResultsAt genus level, the Lachnospira, Faecalibacterium, Bacteroides, Epulopiscium, and Parabacteroides were affected by Biochar500. Furthermore, at upper levels of taxonomy, this biochar treatment increased the relative abundance of bacterial classes Clostridiaceae and Bacteroidia and the fungal families Chaetomiaceae and Aspergillaceae. Concerning the relationship between microbial community and soil chemical properties, soil phosphorus (P) and calcium (Ca) were significantly affected by biochar treatments within the bacterial community; the fungal ones affected significantly soil P and potential acidity (H + Al).ConclusionsEven under the residual effect of 5 years, the application of biochar altered the microbial community on corn plantation, especially concerning on the richness and the abundance of some groups. Biochar500 was the most responsive among the treatments.