bluuebunny/crossref_metadata_2025_split huggingface dataset:
High speed short electric arc deep hole drilling experimental study based on tube electrode
Authors: Hu Guoyu , Fu Fei , Zhang Shengsheng , Gao Wei , Zhang Junfeng , Wang Jiahao 
Published: June 2024

Abstract

To improve the machining efficiency and dimensional accuracy of deep hole drilling, a novel and efficient method of short electric arc drilling (SEAD) by tube electrode is proposed. However, due to the mismatch between excessive arc discharge energy and feed rate, efficient and high dimensional accuracy deep hole machining is fraught with difficulties. This paper reveals the SEAD mechanism based on pulsed power supply, and analyzes the voltage-current waveform and cross-section topography. In addition, the effects of different electrode polarity, voltage, pulse frequency, duty cycle and electrode feed rate on the material removal rate (MRR), relative electrode wear ratio (REWR), average diameter, taper and thickness of the recast layer are also investigated. Finally, an optimum parameters combination was obtained through process parameters optimization experiments, which confirmed the SEAD machining performance. The experimental results show that the SEAD achieved the highest MRR of 369.02 µm/s and the machining time was only 121.91 s with the optimal process parameters. The average diameter of the machined deep hole was 1264.56 µm, the depth was 44.99 mm, and the depth-to-diameter ratio was 35.57.
Microstructure, Magnetism and Electrical Transport Properties of Mn-Ni-Sn based Heusler Alloy Thin Films Grown Using RF Magnetron Sputtering: Consequences of Annealing Conditions
Authors: Verma Annu , Bhatt Komal , Tanwar Jai Dev , Kushwaha Pallavi , Tawale Jai Shankar , Siwach Praveen Kumar , Singh Hari Krishna 
Published: June 2024

Abstract

The study investigates the effects of annealing on the structural, morphological, magnetic, and transport properties of Mn-Ni-Sn-based Heusler alloy thin films grown by UHV RF Magnetron sputtering. A commercial target with the nominal composition Mn2
Ni1.6Sn0.4 was used, and the films were deposited on (001) oriented SrTiO3
substrates. Thin films were deposited at 500 °C, 600 °C, 700 °C, and 800 °C and in situ annealing was done at the respective deposition temperatures for 6 hours. X-ray reflectivity indicated a deposition rate of »4 nm/min. The films exhibited B2 or L21-type structures, or a mixture of both, depending on the annealing temperature. At the highest growth temperature (800 °C), additional diffraction maxima between 40-45° were likely due to Ni3Sn or Mn3
Sn impurity phases, suggesting thermally activated decomposition. Surface microstructures consisting of dark and bright regions evolved from continuous to discontinuous morphology with the increase of the growth temperature. The bifurcation between zero field-cooled (ZFC) and field-cooled warming (FCW) curves decreased, and the magnetic moment increased with deposition temperatures up to 700 °C. The Curie temperature for all films was above room temperature. Films grown at 500 °C, 600 °C, and 700 °C followed the Bloch law below 143 K. However, the film grown at 800 °C, followed this law between 14 K and 75 K. Films grown up to 700 °C behaved like a local magnetic moment system, which is crucial for spin polarization in Heusler systems. Phase degeneration at 800 °C destroyed the half-metallic behavior. All films showed metallic behavior with different resistivity and temperature dependence. Residual Resistivity Ratio (RRR) values were 1.17, 1.51, and 1.64 for films grown at 500 °C, 600 °C, and 700 °C, respectively. The phase degenerated film showed the steepest decline in resistivity, with an exceptionally high RRR of approximately 956.59.
Do the children born after in vitro fertilization or intracytoplasmic sperm injection have a poor intellectual performance? A prospective cohort study.
Authors: Zhou Wei , Song Zhiyi , Xue Xinyi , Li Fuxia , Hu Kuona , Hu Jingmei , Zhang Yang , Cui Linlin , Chen Zijiang 
Published: June 2024

Abstract

Background Assisted reproductive technologies have been proven to be associated with the increased risk of pregnancy complications such as gestational hypertension and neonatal disorders, which may have negative effects on offspring’s health. However, there is insufficient evidence to evaluate the intellectual performance of children born after ART.Research aim: To evaluate the intellectual performance of children born after in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI).Methods This was a prospective cohort study performed at at the Center for Reproductive Medicine, Shandong University. Children conceived by artificial insemination with donor sperm (AID) were enrolled as controls. Age and sex of children, maternal age, family income and education of parent and caregiver were used for propensity score matching in a ratio of 2:1. The total population consisted of 639 singletons aged 6–14 years old (426 in IVF/ICSI group, and 213 in AID group). Wechsler Intelligence Scale for Children Fourth Edition (WISC-IV) Questionnaire was used for the evaluation of intellectual performance. Generalized estimating equation was performed to compare the WISC-IV scores between two groups.Results The total IQ scores, the verbal comprehension Index (VCI) and the perceptual reasoning Index (PRI) were all comparable between IVF/ICSI and AID group. But scores of the block design and digit span were both lower in IVF/ICSI group [block design: 12.6 ± 4.4 vs. 13.6 ± 6.5, adjustedβ(95%CI): -1.13 (-2.17, -0.08); digit span: 11.2 ± 3.5 vs. 12.2 ± 4.2, adjustedβ(95%CI): -1.07 (-1.75, -0.39)]. The results of subgroup analysis showed that the score of digit span were lower in both fresh embryo transfer(fresh ET) and frozen embryo transfer(frozen ET) group compared with AID group[fresh ET: adjustedβ(95%CI): -0.97 (-1.69, -0.24); frozen ET: -1.30 (-2.12, -0.49)], and the score of block design, matrix reasoning, coding were significantly lower in frozen ET group. The score of digit span were lower in both IVF and ICSI group[IVF: adjustedβ(95%CI): -1.15 (-1.87, -0.43); ICSI: -0.97 (-1.83, -0.11)], and the score of block design, matrix reasoning were significantly lower in IVF group.Conclusions Children born after IVF/ICSI have similar FSIQ scores compared with offsprings conceived by AID, but had a poor performance on block design and digit span. These conclusions still need to be confirmed in naturally conceived children.Trial registration N/A.
Generative AI in Assessment: AI Detectors and Implications for Practice
Authors: Liu Jingyi , Nie Youyan , Chua Bee Leng 
Published: June 2024

Abstract

Generative AI has garnered attention as a valuable tool in the field of education. However, educators have expressed concerns about the originality of texts submitted by students as assignments due to the potential use of generative AI in writing tasks. Texts in writing assignments can be categorized into three types: AI-generated, human-written, and mixed texts (a combination of AI-generated and human-written texts). The purpose of the current study is to address some concerns from educators on the detection of the texts submitted by students, i.e., the consistency in detection results and accuracy of the detection results. The subject of the current study was the texts submitted by students as assignments for a graduate course. Four detectors were used to analyze the texts. Our findings provided useful information for educators: 1) Within the same detector, the consistency of the detection results for three types of texts were all above 90%. 2) Among different detectors, the detection results of human-written texts exhibited the highest consistency, whereas mixed texts demonstrated the lowest consistency.3) For accuracy, AI-generated and human-written texts were higher than mixed texts. Implications for educational practice were discussed.
Health Catch-UP!: a realist evaluation of an innovative multi-disease screening and vaccination tool in UK primary care for at-risk migrant patients
Authors: Carter Jessica , Goldsmith Lucy P , Knights Felicity , Deal Anna , Jayakumar Subash , Crawshaw Alison F , Hargreaves Sally 
Published: June 2024

Abstract

Background
Migrants to the UK face disproportionate risk of infections, non-communicable diseases, and under-immunisation compounded by healthcare access barriers. Current UK migrant screening strategies are unstandardised with poor implementation and low uptake. Health Catch-UP! is a collaboratively produced digital clinical decision support system that applies current guidelines (UKHSA and NICE) to provide primary care professionals with individualised multi-disease screening (7 infectious diseases/blood-borne viruses, 3 chronic parasitic infections, 3 non-communicable disease or risk factors) and catch-up vaccination prompts for migrant patients, which needs evaluating as part of a complex intervention to explore effectiveness and acceptability.
Methods
We carried out a mixed-methods process evaluation of Health Catch-UP! in two urban primary healthcare practices to integrate Health Catch-UP! into the electronic health record system of primary care, using the Medical Research Council framework for complex intervention evaluation. We collected quantitative data (demographics, patients screened, disease detection and catch-up vaccination rates) and qualitative participant interviews to explore acceptability and feasibility.
Results
99 migrants were assessed by Health Catch-UP! across two sites (S1, S2). 96.0 % (n=97) had complete demographics coding with Asia 31.3 % (n= 31) and Africa 25.2% (n=25) the most common continents of birth (S1 n=92 [48.9% female (n=44); mean age 60.6 years (SD 14.26)]; and S2 n=7 [85.7% male (n=6); mean age 39.4 years (SD16.97)]. 61.6% (n=61) of participants were eligible for screening for at least one condition and uptake of screening was high 86.9% (n= 53). Twelve new conditions were identified (12.1% of study population) including hepatitis C (n=1), hypercholesteraemia (n= 6), pre-diabetes (n=4) and diabetes (n=1). Health Catch-UP! identified that 100% (n=99) of patients had no immunisations recorded; however, subsequent catch-up vaccination uptake was poor (2.0%, n=1). Qualitative data supported acceptability and feasibility of Health Catch-UP! from staff and patient perspectives, and recommended Health Catch-UP! integration into routine care (e.g. NHS health checks) but required an implementation package including staff and patient support materials, standardised care pathways (screening and catch-up vaccination, laboratory, and management), and financial incentivisation.
Conclusions
Clinical Decision Support Systems like Health Catch-UP! can improve disease detection and implementation of screening guidance for migrant patients but require robust testing, resourcing, and an effective implementation package to support both patients and staff.
Neonatal Amygdala Volumes, Procedural Pain and the Association with Social-Emotional Development in Children Born Very Preterm
Authors: Mueller Megan E. , Graz Myriam Bickle , Truttmann Anita C. , Schneider Juliane , Duerden Emma G. 
Published: June 2024

Abstract

Very preterm birth is associated with later social-emotional impairments, which may result from enhanced vulnerability of the limbic system during this period of heightened susceptibility in early life. In a prospective cohort study, neonates born very preterm (< 30 weeks’ gestation) underwent MRI scanning at term-equivalent age (TEA) and clinical data were collected. Procedural pain was operationalized as the number of skin breaking procedures. Amygdala volumes were automatically extracted. The Strengths and Difficulties questionnaire was used to assess social-emotional outcomes at 5 years of age. General Linear Models were employed to examine the association between neonatal amygdala volumes and social-emotional outcomes, with the timing of procedural pain exposure employed as a moderator in subsequent models. 42 preterm infants were recruited. Larger right amygdala volumes at TEA were associated with impaired prosocial behaviour. Procedural pain was found to moderate the relationship between right amygdala volumes and conduct problems, such that early or late skin breaking procedures experienced within the first few weeks of life strengthened this association. Examination of sensitive windows when the developing brain may be most vulnerable to the adverse effects of procedural pain may inform pain management practices to improve social-emotional outcomes in this population.
Conducting Technology Research in Long-Term Care Homes: Critical Reflections from Pan-Canadian Researchers
Authors: Hung Lillian , Wong Joey , Bharucha Haniya , Ren Lily Haopu , Chu Charlene 
Published: June 2024

Abstract

BackgroundThe global population of older adults is growing, presenting opportunities to enhance care in long-term care homes (LTCHs). Technological advancements offer the potential to address healthcare challenges, such as improving residents' quality of life and social connectedness. However, there is often a mismatch between developed technologies and the actual needs of residents and staff, leading to poor adoption and sustainability. This gap underscores the need for research on developing and implementing technology in LTCHs. Researchers conducting these studies face unique challenges which need to be better explored in the existing literature. Understanding these challenges is crucial for enhancing technology adoption and ensuring its sustainability in LTCHs.MethodsThis study reflects on two technology implementation projects in British Columbia and Ontario, Canada. Researchers from the Telepresence Robot and Mouvmat projects participated in four reflection sessions. The discussions were transcribed and analyzed using reflexive thematic analysis. Our analysis by graduate students and nursing researchers in the team, identified themes and gained useful insight into their experiences, learnings, and recommendations.ResultsBoth projects aimed to enhance the quality of life for LTC residents. The Telepresence Robot project facilitated virtual communication between residents and their families, facing challenges such as training, staff shortages, and infrastructural limitations. Strategies included frequent check-ins with families, creating appropriate training materials, building trust with staff, and co-building solutions to infrastructural issues. Similarly, the Mouvmat project, a co-designed exergaming technology, dealt with recruitment challenges, staff shortages, and demographic changes in LTCH residents. The team used flexible recruitment strategies, virtual orientations, staff engagement tactics and personalized support. The lessons learnt highlighted the need for flexible and adaptive strategies in conducting research LTCHs.ConclusionThe two projects underscore the complex challenges of technology research in LTCHs. The study calls for structural support, partnerships between academics and practice, and efforts to combat ageism in technology use. Researchers need support for knowledge translation and sharing findings to highlight the value of staff participation and showcase research benefits. This reinforces the essential role of research in improving care quality in LTCHs.
A hierarchical roof control and pressure relief method for Gob-side Entry Retaining with Compound Roof
Authors: Dong Yu 
Published: June 2024

Abstract

Gob-side entry retaining is effective for preventing gas accumulation, extracting pressure relief gas, and removing gas from the goaf. This study, based on the No. 312 mining area of Longtan coal mine, aims to clarify roof cutting and pressure relief foundations, calculate key parameters, and propose a roof control method. Using field detection, theoretical analysis, and numerical simulation, the dynamic response of roof drilling and fracture mechanics of hard rock strata were examined. Results indicate that the hard rock stratum dictates the pressure relief mode and difficulty. The failure zone distribution in the hard rock stratum is directly influenced by roof cutting borehole density. Consequently, pressure relief methods, key parameters, and roof control measures under different roof conditions were identified. Engineering applications and monitoring show that the hierarchical roof control and pressure relief method ensures rock stability and significantly enhances pressure relief and roadway retention efficiency.
Thiamine metabolism dysfunction syndrome type IV without encephalopathy: an atypical presentation
Authors: Malmurugan Yathwin Kanagavel , Immanni Ganga Pujitha , Pasupathy Umapathy , Rangasami Rajeswaran , Jayapalan Dinesh Kumar , Manokaran Ranjith Kumar 
Published: June 2024

Abstract

Background
Thiamine metabolism dysfunction syndrome type-4 (THMD-4) is an exceptionally rare autosomal recessive neuro-metabolic disorder characterized by febrile illness-associated episodic encephalopathy, bilateral striatal necrosis, and progressive polyneuropathy. It is caused by bi-allelic pathogenic variations in the SLC25A19 gene encoding the mitochondrial thiamine pyrophosphate carrier. THMD-4 typically presents with recurrent episodes of encephalopathy and weakness triggered by febrile illness, posing diagnostic challenges due to its rarity and variable clinical manifestations.
Case Presentation
: We report the case of an 8-year-old boy, developmentally normal, presenting with weakness in all four limbs following a febrile episode. Notably, the patient lacked altered sensorium. Clinical examination revealed distal muscle weakness, abnormal gait, and absent deep tendon reflexes. Neuroimaging demonstrated characteristic bilateral basal ganglia lesions. Genetic testing identified bi-allelic pathogenic variants in SLC25A19, confirming the diagnosis of THMD-4. Treatment with high-dose biotin and thiamine resulted in gradual improvement of weakness.
Conclusion
This case highlights an unusual presentation of THMD-4 characterized by the absence of typical encephalopathic features. Despite the atypical clinical manifestation, characteristic imaging findings and genetic testing enabled definitive diagnosis. Early recognition of diverse presentations of THMD-4 is crucial for timely intervention and prevention of neurological sequelae. Increased awareness among clinicians about the variable clinical spectrum of THMD-4 can facilitate prompt diagnosis and optimize patient outcomes.
A block upper triangular preconditioner for block three-by-three linear systems arising form the large indefinite least squares problem
Authors: Li Jun , Xin Kailiang , Meng Lingsheng 
Published: June 2024

Abstract

In this paper, to solve the large indefinite least squares problem, we first rewrite the normal equation of it as the sparse block three-by-three linear systems with non-singular diagonal blocks, then GMRES method is used to solve the linear systems. In order to make GMRES method converge quickly, a block upper triangular preconditioner is deduced. Theoretically, the iteration method under the preconditioner is unconditional convergent. Furthermore, the all eigenvalues of the preconditioned matrix are real number and located in a positive interval. Numerical results are provided to support the validity of the theoretical results and demonstrate the effectiveness of the studied precondition.
Mathematics Subject Classification (2010) 65F10 · 65F20
The host behaviour of two compounds, bearing tricyclic fused ring systems, in mixtures of cyclohexanone and its three isomeric methylcyclohexanones
Authors: Barnardo Brandon , Barton Benita , Hosten Eric C 
Published: June 2024

Abstract

Compounds N,N’-bis(9-phenyl-9-xanthenyl)propane-1,3-diamine (H1) and N,N’-bis(9-phenyl-9-xanthenyl)butane-1,4-diamine (H2) were assessed for their host behaviour in cyclohexanone (CYC) and 2-, 3- and 4-methylcyclohexanone (2MeCYC, 3MeCYC and 4MeCYC) through crystallization experiments from these potential guest solvents. It was thus shown that H1 possessed the ability to enclathrate CYC (only), while all four cyclohexanones formed complexes with H2. Thermal analyses and SCXRD revealed that those guest species residing in discrete cavities required more heat in order to be released from their crystals compared with those guests in channels. Furthermore, the thermally most stable complex of H2 was H2·4MeCYC, whilst the least stable one was H2·3MeCYC, as observed from the guest release onset temperatures through thermal analyses. The conformations of the host molecules were also investigated and compared. In H1·CYC, the nitrogen atoms of the diamino linker were involved in an intramolecular (host)N‒H···N(host) hydrogen bond which was absent in the complexes with H2. However, H2·2(CYC), H2·2(3MeCYC) and H2·4MeCYC all experienced strong intermolecular (host)N‒H···O(guest) hydrogen bonds which assisted in retention of the guests in the complexes; this interaction type was absent in both H1·CYC and H2·2(2MeCYC). Guest competition experiments showed that H2 possessed an affinity for, more usually, 3MeCYC, despite the complex of this guest with H2 being the least thermally stable one. Hirshfeld surface analyses, however, were not useful in understanding the host selectivity behaviour in these mixed guest solvents. Finally, it was concluded that, unfortunately, H2 would not be an appropriate host compound for these mixed guest separations through supramolecular chemistry strategies (the more usual fractional distillations are extremely challenging owing to similar boiling points) due to lower than required selectivities in these guest mixtures. (Note that H1 was not employed in analogous guest competition experiments due to its extremely slow crystal growth from these mixtures.)
g-C3N4@COF heterojunction filler for polymer electrolytes enables fast Li+ transport and high mechanical strength
Authors: Liu Yongbiao , Song Yang , Zhang Yongshang , Liu Jiande , Li Lin , Zhang Linsen , Du Lulu 
Published: June 2024

Abstract

Solid polymer electrolytes (SPEs) show great promise for high-energy and high-safety lithium metal batteries. However, current SPEs suffer from low ionic conductivity and poor mechanical strength. Herein, the g-C3N4@COF heterojunction filler is constructed for SPEs for fast Li+ transport and high Li+ transference number. In addition, a robust 3D network is fabricated by using g-C3N4@COF heterojunction filler in order to further improve the mechanical robustness and electrochemical stability. As a consequence, the g-C3N4@COF-3D network/polymer electrolyte displays an ionic conductivity of 1.25×10− 4 S cm− 1 at 30℃, an electrochemical window of 5.0 V and the tensile strength of 8.613 MPa. Furthermore, assembled LiFePO4//Li battery with the g-C3N4@COF-3D network/polymer electrolyte presents remarkable cycling stability with capacity retention of 99.71% after 600 cycles. Above results indicate the great potential of the g-C3N4@COF-3D network/polymer electrolyte for advanced energy storage devices.