bluuebunny/crossref_metadata_2025_split huggingface dataset:
Role of Fetal Second Trimester 2D Ultrasound Facial Parameters in Down Syndrome Detection
Authors: Mylavarapu Swathi , Singh Arati , Kolar Geeta 
Published: June 2024

Abstract
Introduction Down syndrome (DS) is the most common genetic cause of intellectual disability in humans. Various screening techniques are available, including the detection of facial characteristics of DS fetuses by prenatal ultrasonographic markers. Very few studies have tested the predictive validity of the markers in the Indian population.
Objective This article determines the role of second trimester ultrasound in predicting DS using facial markers, namely, nasal bone length (NBL), prenasal thickness (PNT), NBL/PNT ratio, and PNT/NBL ratio in the Indian population
Materials and Methods This prospective observational study recruited singleton pregnant women at 14 to 28 weeks of gestation with no comorbidities. Women with maternal disorders, abnormal amniotic fluid, and fetal structural anomalies were excluded. Three images of the midsagittal plane were obtained during a routine anomaly or well-being scan. The single “best” image was used for analysis. Scatter plots with regression lines and percentile curves for each gestation were created. Developed nomograms and scattered plots were validated by recruiting DS fetuses (diagnosed by amniocentesis and fetal karyotype).
Results This study included 450 normal fetuses for developing nomograms, which were verified by matching 45 DS fetuses. The diagnostic accuracy of NBL, PNT, NBL/PNT ratios and PNT/NBL ratios was found to be 94, 99, 95, and 94.8, respectively. Sensitivity and specificity were found to be 51.11, 42.42, 48.89, 65.4 and 99, 96, 99.56, and 96.7 for NBL, PNT, NBL/PNT ratio, and PNT/NBL ratio, respectively. False negative rate and false positive rate were 38.89, 57.58, 51.11, 34.6 and 1, 4, 0.44, 3.3 for NBL, PNT, NBL/PNT ratio, PNT/NBL ratio, respectively.
Conclusion High diagnostic accuracy was found for PNT, followed by NBL/PNT ratio, PNT/NBL ratio, and NBL. However, considering sensitivity and specificity markers together, we found the NBL/PNT ratio as a good diagnostic marker in predicting DS. Furthermore, the NBL/PNT ratio performs slightly better than its inverse counterpart (PNT/NBL ratio) for detecting DS fetuses, primarily because it produced less false positive cases.
Association of Placental Umbilical Cord Insertion Site with Maternal and Fetal Outcomes: A Prospective Study
Authors: Sabu Brinda , Hakkim Sameera , Ambat Roshini 
Published: June 2024

Abstract
Introduction Adequate fetal growth during pregnancy depends upon the normal development and insertion of the umbilical cord. Central/paracentral placental cord insertion is considered normal, while marginal/velamentous cord insertion is considered abnormal. Although the location of placental umbilical cord insertion can be determined by ultrasound (US), it is not included in the routine protocol of a targeted anomaly scan. Through this study, we determined different placental umbilical cord insertion sites by US and categorized them as normal and abnormal, identified the risk factors involved, and evaluated the outcome of pregnancies using standard protocols. The rationale of this study was to identify pregnancies that require frequent monitoring and surveillance for an optimal perinatal outcome.
Methods A prospective cohort study was conducted in a tertiary care hospital for 18 months. A total of 345 pregnant women who attended the antenatal outpatient department between 18 and 22 weeks for targeted imaging for fetal anomalies scan were included in the study after informed consent. Detailed history followed by US documentation of the cord insertion site on the placenta was done and women were followed up throughout pregnancy to look for development of complications including hypertensive disorders, antepartum hemorrhage (APH), and fetal growth restriction (FGR). Intrapartum adverse events like fetal distress and intrapartum hemorrhage were assessed. Confirmation of US findings was done by macroscopic examination of the placenta and measuring the distance between the placental cord insertion and the edge of the placenta. The weight of the placenta was also documented. Newborns were evaluated for adverse outcomes like preterm birth, low birth weight, need for resuscitation, and neonatal intensive care unit (NICU) admission. Follow up of neonates and mothers was done till discharge.
Results Placental cord insertion was accurately determined at the anomaly scan with 100% sensitivity and specificity. The study showed 44 abnormal placental cord insertions (ACIs)—42 had marginal and 2 had velamentous cord insertions. There was a high incidence of ACI noted in women aged more than 28 years, with body mass index of more than 26.38, multiparity, previous history of myomectomy, first trimester miscarriage, and conceived by assisted reproductive technology. Women with ACI had an increased risk of small for gestational age/FGR and APH and had an average baby weight of 2.7 kg, which was 200 g less than babies with normal cord insertion. They also had lower mean Apgar scores at 5 minutes and required resuscitation and NICU admission.
Conclusion Our study concluded that it will be a good practice to document the placental cord insertion during the mid trimester anomaly scan so that we can identify the subset of pregnant women who are prone to develop complications, thereby providing adequate surveillance for an optimal perinatal outcome.
Do translation universals exist at the syntactic-semantic level? A study using semantic role labeling and textual entailment analysis of English-Chinese translations
Authors: Wang Letao , Jiang Yue 
Published: June 2024

AbstractAlbeit extensive studies of translation universals at lexical and grammatical levels, there has been scant research at the syntactic-semantic level. To bridge this gap, this study employs semantic role labeling and textual entailment analysis to compare Chinese translations with English source texts and non-translated Chinese original texts. The research has found substantial evidence for translation universals like explicitation, simplification, and levelling out at the syntactic-semantic level, which is illustrated by significant differences between syntactic-semantic features of Chinese translations and those of English source texts and Chinese original texts. This suggests a distinct syntactic-semantic uniqueness of Chinese translations, wherein the overall features exhibit an “eclectic” characteristic, showcasing contrasting outcomes such as explicitation identified as S-universal and implicitation deemed T-universal. This could be attributed to the gravitational pull from the two language systems. In the inspection of specific semantic roles, features of agents and discourse markers are found to be evidence for both S-explicitation and T-explicitation, potentially reflecting the role of socio-cultural factors in shaping the uniqueness of syntactic-semantic features of Chinese translations. These findings further underscore the complexity inherent in translation, highlighting its function as a dynamic balance system.
Digital economy as a catalyst for low-carbon transformation in China: new analytical insights
Authors: Xu Mengmeng , Tan Ruipeng 
Published: June 2024

AbstractTo obtain a consistent estimate of the impact of digital economy on the carbon total factor productivity (CTFP) is important not only in the academic field but also for the policymakers. However, the existence of endogeneity issue makes it challenging. This paper constructs a novel analysis framework that can measure the CTFP as well as the impact of digital economy simultaneously after addressing the endogeneity. By employing the endogenous stochastic frontier analysis method, the findings indicate that digital economy has a positive and significant effect on CTFP, which persists when different production functions and instrumental variables are employed. Mechanism analysis reveals that the positive impact is facilitated by changes in production methods and improvements in urban environmental regulatory governance. Moreover, the effect of digital economy on CTFP is more pronounced in regions with higher environmental awareness among residents, lower resource abundance, and higher levels of human capital. The results provide valuable policy insights into the utilization of the digital economy to achieve green and high-quality development in China, including to promote the regional balanced development of digital economy and so on.
Economic impact of ACES trends on the automotive value chain: a forecast exploratory study of the Chinese automotive industry in 2030
Authors: Chen Yu , Zhu Di 
Published: June 2024

AbstractIn the context of green transportation, the automotive industry is undergoing a revolution in autonomous, connected, electric, and shared (ACES) vehicles. ACES vehicles have a relatively short history and there is limited relevant market data available. Therefore, quantitative research on the economic impact of ACES trends remains a new area of exploration. The purpose of the paper is to explore the economic impact of ACES trends on the automotive value chain, with a specific focus on the production and aftermarket segments. In the paper, a detailed quantitative analysis of the installation scale and the market size of Chinese automotive production as well as the income changes of Chinese automotive aftermarket in 2030 is conducted. The findings show that the new markets for power batteries, electric powertrains, sensors, in-vehicle software and chips are created, thereby delivering more value to the business. While the ACES trends are expected to decrease the average aftermarket income per vehicle, the growth of the vehicle stock suggests significant potential for the development of the automotive aftermarket in 2030. Our research contributes by offering a business perspective on the impact of ACES trends. The quantitative insights presented are timely and crucial for all the stakeholders along the value chain, enabling them to adapt and thrive in the dynamic automotive landscape and align their strategies with the transformative ACES trends.
Pronunciation instruction in the context of world English: exploring university EFL instructors’ perceptions and practices
Authors: Almusharraf Asma 
Published: June 2024

AbstractTeaching a foreign language requires instructors to be knowledgeable about and capable of providing instruction that facilitates their students’ ability to understand, speak, read, and write the new language. However, as established within the literature, there appears to be a disconnect between what should be offered as pronunciation instruction and what takes place in many EFL classrooms. This study, therefore, undertook to identify Saudi university EFL instructors’ perceptions and practices towards pronunciation instruction. The study employed a mixed methods survey research design, combining qualitative and quantitative approaches. Participants included 163 EFL instructors from Saudi universities. The results of the current study showed that while most participants recognized the importance of pronunciation instruction and were confident of their English pronunciation, many also felt that they lacked the training necessary to fully provide instruction and assessment of their students’ English pronunciation. The participants also identified those extraneous factors that affected their ability to provide fulsome pronunciation learning experiences. The study highlights the existing gap between the ideal pronunciation instruction and the current practices in Saudi university EFL classrooms. It emphasizes the need for enhanced training for instructors to improve their ability to deliver effective pronunciation instruction and assessment.
Characterisation of young stroke presentations, pathways of care, and support for ‘invisible’ difficulties: a retrospective clinical audit study
Authors: Grech Michaela , Withiel Toni , Klaic Marlena , Fisher Caroline A. , Simpson Leonie , Wong Dana 
Published: June 2024

Background Young stroke survivors are likely to be discharged home from acute hospital care without rehabilitation more quickly than older survivors, but it is not clear why. File-audit studies capturing real-world clinical practice are lacking for this cohort. We aimed to compare characteristics and care pathways of young and older survivors and describe stroke presentations and predictors of pathways of care in young survivors (≤45 years), including a focus on care received for ‘invisible’ (cognitive, psychological) difficulties. Methods A retrospective audit of 847 medical records (67 young stroke survivors, mean age = 36 years; 780 older patients, mean age = 70 years) was completed for stroke survivors admitted to an Australian tertiary hospital. Stroke characteristics and presence of cognitive difficulties (identified through clinician opinion or cognitive screening) were used to predict length of stay and discharge destination in young stroke survivors. Results There were no differences in length of stay between young and older survivors, however, young stroke survivors were more likely to be discharged home without rehabilitation (though this may be due to milder strokes observed in young stroke survivors). For young stroke survivors, stroke severity and age predicted discharge destination, while cognitive difficulties predicted longer length of stay. While almost all young survivors were offered occupational therapy and physiotherapy, none received psychological input (clinical, health or neuropsychology). Conclusions Cognitive and psychological needs of young stroke survivors may remain largely unmet by a service model designed for older people. Findings can inform service development or models of care, such as the new Australian Young Stroke Service designed to better meet the needs of young survivors.
Impact of green manure crop species on rhizosphere soil phosphorus
Authors: Nguyen P. V. , McDowell R. W. , Condron L. M. 
Published: June 2024

Context Green manure crops have the potential to improve phosphorus (P) use efficiency in agroecosystems by enhancing the mobilisation of soil P reserves. Aims This study investigated and quantified the short-term mobilisation and uptake of soil P in the rhizosphere of several green manure crops. Methods Five plant species/varieties (Lupinus angustifolius (lupin – early and late flowering varieties), Pisum sativum (pea), Cicer Arietinum (chickpea), and Fagopyrum escolentum (buckwheat)) were grown in two contrasting soils, pumice (1100 mg total P kg−1, anion storage capacity 39%) and volcanic ash (2800 mg total P kg−1, anion storage capacity 95%) in rhizosphere study containers. After 40 days, rhizosphere (0–5 mm) and bulk (>5 mm) soils were sampled and subjected to P fractionation. Organic anions were collected from the rhizoplane using an anion exchange membrane. Key results Dry matter yield, P uptake, and rhizoplane organic anion exudation were affected by plant species, soil type, and their interaction. Rhizosphere P changes of labile inorganic organic P and stable inorganic P were influenced by plant species and soil type, while moderately labile inorganic P was affected by only plant species. Interaction between plant species and soil type had no effect on rhizosphere P depletion or accumulation. The quantities and composition of organic anions determined in rhizoplane exudates were highly variable (0.01–0.1 μmol cm−2 h−1). However, significant correlations were observed between the depletion of moderately labile and stable soil inorganic P and concentrations of malate in exudates. Conclusions The findings of this study clearly demonstrated the capacity of green manure crops (especially blue lupin) to rapidly mobilise and deplete different forms of soil P across the soil types.
Effect of carburizing time treatment on microstructure and mechanical properties of low alloy gear steels
Authors: Boumediri Haithem , Touati Sofiane , Debbah Younes , Selami Salim , Chitour Mourad , Khelifa Mansouri , Kahaleras Mohamed said , Boumediri Khaled , Zemmouri Amina , Athmani Moussa , Fernandes Filipe 
Published: June 2024

Abstract
Gas carburizing significantly enhances the surface properties of low-alloy gear steels, resulting in superior micro-hardness, layer thickness, carbon content, and overall mechanical properties. Unlike other thermochemical processes such as nitriding and carbonitriding, which have limitations in core properties and hardening depth, gas carburizing offers unmatched surface hardness, wear resistance, and mechanical strength. This makes it ideal for demanding applications in the automotive, aerospace, and manufacturing industries. In this research, samples were gas-carburized for 4, 6, or 8 h. The results showed significant improvements: micro-hardness increased from approximately 140 HV to over 819 HV, and the surface layer thickness grew by more than 41%, from 1166 μm to 1576 μm. Additionally, the carbon content in the surface layer increased by over 450%, reaching up to 0.94 wt%. Clear correlations were observed between the duration of heating and the mechanical properties. Longer heating times, particularly after 8 h, raised ultimate tensile strength from 427.29 MPa to 778.33 MPa, while simultaneously decreasing elongation from 26.07% to 2.88% and resilience from 180 J cm−2 to 6.66 J cm−2. This optimization not only enhances surface hardness and durability but also improves key mechanical properties such as tensile strength, stiffness, resilience, and overall mechanical performance.
Effect of aging on the structure and mechanical properties of austenite stainless steel N50 alloyed with nitrogen, niobium and vanadium
Authors: Muradian Sarkis , Liu Mingzhou , Sun Yan 
Published: June 2024

Abstract
In this study, the austenitic, corrosion-resistant N50 steel alloyed with different nitrogen, niobium and vanadium content was investigated. This steel is used in the production of high-strength, cryogenic pipes. The production process for these pipes involves aging at 650 °C–665 °C for 50–100 h. Therefore, steels were examined in their as-delivered state, after aging at 650 °C, 100 h and after solid solution heat treatment. The structure of the steel was analyzed using optical and scanning microscopy, tensile and impact strength tests were conducted at room temperature and at −196 °C. It was found that the total volume fraction of the precipitated phase after aging is more dependent on the total concentration of nitride-forming elements—Nb and V, than on nitrogen. Aging does not affect the basic operational properties at room temperature, but it can significantly affect toughness at −196 °C.
Comparison of mathematical and supervised machine-learning models for ductile-to-brittle transition in bcc alloys
Authors: Ahmedabadi Parag M 
Published: June 2024

Abstract
This study focuses on modelling Ductile-to-Brittle Transition (DBT) curves using various mathematical and supervised machine learning models. Charpy impact energy values are converted to normalized energy values to account for reductions in upper-shelf energy. The research introduces a saturation parameter in mathematical models to capture these variations and examines the influence of alloying elements, microstructure, and neutron irradiation on DBT behaviour in nuclear structural materials. Detailed analyses reveal how fitting parameters vary with these factors and demonstrate that mathematical models’ fitting parameters generally align with observed DBT curve trends. The predictive capabilities of these mathematical models are also compared with those of supervised machine learning models, highlighting the strengths and limitations of each approach in modelling DBT behaviour. An explainable approach is used for interpretation of machine learning models and it is shown that this approach can be effectively used for the influence of various independent parameters on impact energy.
Photoelectronic synaptic transistors with tuneable synaptic plasticity based on films of P3HT with ordered polymer chains
Authors: Gong Jixin , Li Tong , Cao Boyu , Liu Hongxin , Zhang Sijie , Dove Martin T 
Published: June 2024

Abstract
We show that the properties of photoelectronic synaptic transistors based on films with aligned P3HT polymer chains can be tuned by varying the orientations of the polymer chains with respect to the electrodes. The electrical responses corresponding to displays of synaptic plasticity are studied using a range of electrical and optical stimulation. It is shown that the orientation significantly modulates the properties, demonstrating that the orientation of the polymer film with respect to the electrodes enables a tuning of the synaptic plasticity.
Tunable optical properties of graphene wrapped ZnO@Ag spherical core-shell nanoparticles
Authors: Ali Belayneh Mesfin 
Published: June 2024

Abstract
In this paper, we studied theoretically and numerically the material’s response to incident electromagnetic wave of graphene wrapped zinc-oxide/silver (g − ZnO@Ag) core–shell spherical nanoparticles embedded in a dielectric host matrix. As the nanoparticles size is ∼30 nm, a size much smaller than the wavelength of light, the quasi-static approximation is utilized to obtain analytical expressions for the electric polarizability and the corresponding extinction cross-section. It is found that the spectra of the extinction cross-section of g − ZnO@Ag nanoparticles exhibit two sets of localized surface resonance peaks in the visible and near infra-red (NIR) spectral regions. The first set of peaks observed below ∼900 nm are due to the coupling of the energy gap of the ZnO core with the local surface plasmon resonances of Ag shell, and the second set of graphene-assisted narrow peaks located in the NIR region (above ∼900 nm) are attributed to the plasmons excited at the Ag/graphene interface. It is found that the intensity of the extinction cross-section as well as the positions of the resonance wavelengths are interesting that the graphene-assisted narrow peaks are strongly dependent on the number of layers (N

g
) and the chemical potential (μ) of graphene. It means that the response of ZnO@Ag core–shell nanoparticles to electromagnetic fields are greatly enhanced when it is wrapped with graphene and can also be tuned in the therapeutic NIR spectral region by varying N

g
and μ. The results may be used for possible application in the medical fields, especially for cancer detection and drug delivery.