bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reliability analysis of the compressed air supplying system in underground mines
Authors: Rahimdel Mohammad Javad , Ghodrati Behzad 
Published: April 2023

AbstractDespite the high cost and low efficiency, compressed air is mostly used in underground mining for ore extraction, hoisting, and mineral processing operations. Failures of compressed air systems not only threaten the health and safety of workers but also contribute to inefficient control of airflow and stopped all equipment that operates by compressed air. In such uncertain conditions, mine managers are faced with the big challenge to supply enough compressed air, and therefore, the reliability evaluation of these systems is essential. This paper aims to analyze the reliability of the compressed air system using the Markov modeling approach as a case study, Qaleh-Zari Copper Mine, Iran. To achieve this, the state space diagram was constructed considering all relevant states for all compressors in the main compressor house of the mine. The failure and repair rate of all main and reserve compressors were calculated for all possible transitions between states to obtain the probability of being of the system in each of the states. Moreover, the probability of failure at any time period was considered to study the reliability behavior. The results of this study show that there is 31.5% probability that the compressed air supplying system is in operating condition with two main and one standby compressors. The system probability that two main compressors are remain in the operation without failure for one months is 92.32%. Furthermore, the lifetime of the system is estimated 33 months when at least one main compressor is active.
Antagonistic fatigue crack acceleration/deceleration phenomena in Ni-based superalloy 718 under hydrogen-supply
Authors: Takakuwa Osamu , Ogawa Yuhei , Miyata Ryunosuke 
Published: April 2023

AbstractMechanical properties of structural alloys, including Ni-based superalloy 718 (Alloy718), are degraded when hydrogen (H) is supplied: hydrogen embrittlement (HE). The presence of H notably deteriorates fatigue crack growth (FCG) property, which renders the growth rate much higher and shortens the lifetime of the components operating in the hydrogenating environment. Hence, the mechanisms behind such acceleration phenomenon in FCG should be understood comprehensively toward developing promising alloys resistant to hydrogen occlusion. In particular, Alloy718 has a meager resistance to HE, even regularly displaying superior mechanical and physical performances. Notwithstanding, the present study unveiled that the FCG acceleration by dissolved H in Alloy718 can be negligible. An abnormal deceleration of FCG can instead be pronounced by optimizing the metallurgical state, a hopeful prospect in Ni-based alloys applied to the hydrogenating environment.
Imaging the subsurface architecture in porphyry copper deposits using local earthquake tomography
Authors: Comte Diana , Palma Gisella , Vargas Jimena , Calle-Gardella Daniela , Peña Matías , García-Fierro Sergio , D’Andres Joëlle , Roecker Steven , Pichott Sergio 
Published: April 2023

AbstractAn essential part of the world's remaining mineral resources is expected to reside deep in the crust or under post-mineralization cover. For porphyry copper deposits, the world’s primary source of Cu, Mo, and Re, identifying the dynamic processes that control their emplacement in the upper crust can guide future exploration. Seismic tomography can constrain these processes through imaging deep-seated structures at the regional scale. Here we construct a three-dimensional model of the Vp/Vs ratio, based on arrival times of P and S seismic waves, beneath the Cerro Colorado porphyry Cu–(Mo) deposit in northern Chile. Our images show that low Vp/Vs (~ 1.55–1.65) anomalies, extending to ~ 5–15 km depth, coincide with the surface expression of known porphyry copper deposits and prospects, as well as delimit structures that host orebodies and related hydrothermal alteration zones. Medium Vp/Vs (~ 1.68–1.74) and high Vp/Vs (Vp/Vs ~ 1.85) bodies correspond to intermediate-felsic plutonic precursors for porphyry intrusions and mafic magma reservoirs that underlie shallower orebodies, respectively. Imaging these precursor and parental plutons is crucial to the identification of orebodies as they act as the source of fluids for porphyry copper generation. This study demonstrates the potential of local earthquake tomography as a tool to identify future deep mineral resources with minimal environmental impact.
Factors associated with adverse drug reactions or death in very elderly hospitalized patients with pulmonary tuberculosis
Authors: Yagi Mitsuaki , Shindo Yuichiro , Mutoh Yoshikazu , Sano Masahiro , Sakakibara Toshihiro , Kobayashi Hironori , Matsuura Akinobu , Emoto Ryo , Matsui Shigeyuki , Nakagawa Taku , Ogawa Kenji 
Published: April 2023

AbstractThe aging of patients with tuberculosis and better therapeutic management for them are recent concerns. This study aimed to identify risk factors for adverse drug reactions (ADRs) or death in very elderly patients with pulmonary tuberculosis and to assess the association between the dosage of antituberculosis drugs and outcomes. We conducted a multicenter retrospective study at two hospitals. Hospitalized patients (≥ 80 years old) with pulmonary tuberculosis who were treated with antituberculosis drugs were enrolled. Multivariate analysis was performed to assess factors associated with ADRs or death within 60 days after treatment initiation. In total, 632 patients were included. The primary endpoint occurred in 268 patients (190 ADRs and 78 deaths). A serum albumin level < 2.5 g/dL, respiratory failure, and dependent activities of daily living were independent risk factors for ADRs or death. However, a low dosage (< 8 mg/kg/day) of rifampicin was associated with a lower risk of the primary outcomes. Delayed time to negative sputum culture conversion was not observed in the lower dosage of rifampicin group. Very elderly hospitalized tuberculosis patients with the aforementioned risk factors should be carefully monitored to receive safer treatment. Rifampicin dosage reduction may be considered for very elderly tuberculosis patients to prevent ADRs/death.
Complete remission in children and adolescents with type 1 diabetes mellitus—prevalence and factors
Authors: Podolakova Kristina , Barak Lubomir , Jancova Emilia , Tarnokova Simona , Podracka Ludmila , Dobiasova Zuzana , Skopkova Martina , Gasperikova Daniela , Stanik Juraj 
Published: April 2023

AbstractLittle is known about complete remission in Type 1 diabetes mellitus (T1D) with the discontinuance of insulin treatment for a period of time. In this retrospective study we analysed the frequency and factors of onset and duration of 1. remission and 2. complete remission in children and adolescents with T1D from the Children Diabetes Centre in Bratislava, Slovakia. A total of 529 individuals with T1D, aged < 19 years (8.5 ± 4.3 years) at diabetes onset were included in the study. Remission was defined by HbA1c < 7.0% (53 mmol/mol) and an insulin daily dose < 0.5 IU/kg (and 0 IU/kg for complete remission). Remission occurred in 210 (39.7%) participants, and 15 of them had complete remission (2.8% from all participants). We have identified a new independent factor of complete remission onset (higher C-peptide). Complete remitters had a longer duration of remission compared with other remitters and also differed in lower HbA1c levels. No association was seen with autoantibodies or genetic risk score for T1D. Thus, not only partial but also complete remission is influenced by factors pointing toward an early diagnosis of T1D, which is important for better patient outcome.
Microvascular and oxidative stress responses to acute high-altitude exposure in prematurely born adults
Authors: Manferdelli Giorgio , Narang Benjamin J. , Pialoux Vincent , Giardini Guido , Debevec Tadej , Millet Grégoire P. 
Published: April 2023

AbstractPremature birth is associated with endothelial and mitochondrial dysfunction, and chronic oxidative stress, which might impair the physiological responses to acute altitude exposure. We assessed peripheral and oxidative stress responses to acute high-altitude exposure in preterm adults compared to term born controls. Post-occlusive skeletal muscle microvascular reactivity and oxidative capacity from the muscle oxygen consumption recovery rate constant (k) were determined by Near-Infrared Spectroscopy in the vastus lateralis of seventeen preterm and seventeen term born adults. Measurements were performed at sea-level and within 1 h of arrival at high-altitude (3375 m). Plasma markers of pro/antioxidant balance were assessed in both conditions. Upon acute altitude exposure, compared to sea-level, preterm participants exhibited a lower reperfusion rate (7 ± 31% vs. 30 ± 30%, p = 0.046) at microvascular level, but higher k (6 ± 32% vs. −15 ± 21%, p = 0.039), than their term born peers. The altitude-induced increases in plasma advanced oxidation protein products and catalase were higher (35 ± 61% vs. −13 ± 48% and 67 ± 64% vs. 15 ± 61%, p = 0.034 and p = 0.010, respectively) and in xanthine oxidase were lower (29 ± 82% vs. 159 ± 162%, p = 0.030) in preterm compared to term born adults. In conclusion, the blunted microvascular responsiveness, larger increases in oxidative stress and skeletal muscle oxidative capacity may compromise altitude acclimatization in healthy adults born preterm.
Self-emergent vortex flow of microtubule and kinesin in cell-sized droplets under water/water phase separation
Authors: Sakuta Hiroki , Nakatani Naoki , Torisawa Takayuki , Sumino Yutaka , Tsumoto Kanta , Oiwa Kazuhiro , Yoshikawa Kenichi 
Published: April 2023

AbstractBy facilitating a water/water phase separation (w/wPS), crowded biopolymers in cells form droplets that contribute to the spatial localization of biological components and their biochemical reactions. However, their influence on mechanical processes driven by protein motors has not been well studied. Here, we show that the w/wPS droplet spontaneously entraps kinesins as well as microtubules (MTs) and generates a micrometre-scale vortex flow inside the droplet. Active droplets with a size of 10–100 µm are generated through w/wPS of dextran and polyethylene glycol mixed with MTs, molecular-engineered chimeric four-headed kinesins and ATP after mechanical mixing. MTs and kinesin rapidly created contractile network accumulated at the interface of the droplet and gradually generated vortical flow, which can drive translational motion of a droplet. Our work reveals that the interface of w/wPS contributes not only to chemical processes but also produces mechanical motion by assembling species of protein motors in a functioning manner.
Phosphorescent 2-phenylbenzothiazole PtIV bis-cyclometalated complexes with phenanthroline-based ligands
Authors: Corral-Zorzano Andrea , Gómez de Segura David , Lalinde Elena , Moreno M. Teresa 
Published: April 2023

Synthesis, photophysical, electrochemical properties and theoretical calculations of a series of dicationic tris-chelate PtIV complexes, which combine two cyclometalated 2-phenylbenzothiazole and phenanthroline-based ligands.
Linear not cyclic – unravelling an anionic initiation pathway for Lewis pair polymerization of lactones
Authors: Nieboer Vincent , Fanjul-Mosteirín Noé , Olsén Peter , Odelius Karin 
Published: April 2023

Lewis pair (LP) catalysis is a powerful system for polymerizing lactone monomers into cyclic polymers. However, current work reveals that the DBU-ZnEt2 LP-catalytic system leads to the formation of linear polymers via an anionic initiation pathway.
Imaging of the internal structure of an asteroid analogue from quasi-monostatic microwave measurement data
Authors: Dufaure A. , Eyraud C. , Sorsa L.-I. , Yusuf Y.O. , Pursiainen S. , Geffrin J.-M. 
Published: April 2023

Context.The internal structure of small Solar System bodies (SSSBs) is still poorly understood, although it can provide important information about the formation process of asteroids and comets. Space radars can provide direct observations of this structure.Aims.In this study, we investigate the possibility to infer the internal structure with a simple and fast inversion procedure applied to radar measurements. We consider a quasi-monostatic configuration with multiple measurements over a wide frequency band, which is the most common configuration for space radars. This is the first part (Paper I) of a joint study considering methods to analyse and invert quasi-monostatic microwave measurements of an asteroid analogue. This paper focuses on the frequency domain, while a separate paper focuses on time-domain methods.Methods.We carried out an experiment in the laboratory equivalent to the probing of an asteroid using the microwave analogy (multiplying the wavelength and the target dimension by the same factor). Two analogues based on the shape of the asteroid 25143 Itokawa were constructed with different interiors. The electromagnetic interaction with these analogues was measured in an anechoic chamber using a multi-frequency radar and a quasi-monostatic configuration. The electric field was measured on 2372 angular positions (corresponding to a sampling offering complete information). We then inverted these data with two classical imaging procedures, allowing us to reach the structural information of the analogues interior. We also investigated reducing the number of radar measurements used in the imaging procedures, that is both the number of transmitter-receiver pairs and the number of frequencies.Results.The results show that the 3D map of the analogues can be reconstructed without the need for a reference target. Internal structural differences are distinguishable between the analogues. This imaging can be achieved even with a reduced number of measurements. With only 35 well-selected frequencies over 321 and 1257 transmitter-receiver pairs, the reconstructions are similar to those obtained with the entire frequency band.
Quantitative correlation of refractory elemental abundances between rocky exoplanets and their host stars
Authors: Liu Zibo , Ni Dongdong 
Published: April 2023

Context. Stellar elemental abundances are generally used to constrain the interiors of rocky exoplanets by assuming planet’s relative abundances of major refractory elements (Fe, Mg, and Si) are similar to those of their host stars. Very recently, a non-one-to-one correlation was found among the compositions of low-mass planets and their host stars. It is therefore of great interest to further explore this correlation for larger samples of rocky exoplanets.
Aims. We focus on a large sample of rocky exoplanets and compute their bulk elemental abundance ratios. We analyze the quantitative correlation between rocky exoplanets and their host stars by comparing the abundance ratios of these refractory elements.
Methods. The interior of rocky exoplanets is assumed to be an iron-rich core overlaid with a silicate mantle. We constrained the bulk composition of rocky exoplanets from their measured mass and radius, using Bayesian statistical approaches. Then we used orthogonal distance regression (ODR) to characterize the compositional correlation between rocky exoplanets and their host stars.
Results. Some rocky exoplanets are shown to have high iron-mass fractions and are thus likely to be iron-enriched super-Mercuries. We find the iron content of rocky exoplanets is dependent on the metallicity [Fe/H] of their host stars. The planets formed around a higher metallicity star generally span a wider range of iron masses, allowing for a higher iron content. Moreover, we directly compared the iron-mass fractions of rocky exoplanets with those deduced from the refractory elemental abundance ratios of their host stars. The results suggest that most rocky planets are more iron-enriched with respect to the initial protoplanetary disk.
Circular ribbon flare triggered from an incomplete fan-spine configuration
Authors: Mitra Prabir K. , Veronig Astrid M. , Joshi Bhuwan 
Published: April 2023

Context. Circular ribbon flares are characterised by circular, semi-circular, or elliptical ribbon brightenings. As the physics of such solar events involves a true 3D magnetic topology, they have been extensively studied in contemporary solar research.
Aims. In order to understand the triggering processes and the complex magnetic topology involved in circular ribbon flares, we carried out a thorough investigation of an M-class circular ribbon flare that originated within close proximity of a quasi-separatrix layer (QSL).
Methods. We combined multi-wavelength Atmospheric Imaging Assembly (AIA) and Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observations with photospheric Helioseismic and Magnetic Imager (HMI) observations and coronal magnetic field modelling analysis using the non-linear force free field (NLFFF) model.
Results. The circular ribbon flare occurred from a complex magnetic configuration characterised by negative magnetic patches surrounded by positive-polarity regions on three sides. As the negative polarity patches were not surrounded by positive-polarity regions on all four sides, the corresponding coronal field was devoid of any null points. This led to the formation of an incomplete fan-spine-like configuration that deviated from classical fan-spine configurations in null-point topology. Further, an observationally identified QSL structure was situated within the active region, very close to the flaring region. The presence of the QSL was verified by the NLFFF modelling. The far end of the spine-like lines terminated very close to one footpoint location of the QSL lines. Our analysis suggests that activities at this location led to the activation of a flux rope situated within the fan-like lines and triggering of the circular ribbon flare via perturbation of the overall fan-spine-like structure. Further, we identified RHESSI X-ray sources from the footpoints of the QSL structure, which suggests that slipping reconnections can also lead to discernible signatures of particle acceleration.
Mass bias and cosmological constraints fromPlanckcluster clustering
Authors: Lesci G. F. , Veropalumbo A. , Sereno M. , Marulli F. , Moscardini L. , Giocoli C. 
Published: April 2023

Aims.We analysed the 3D clustering of thePlancksample of Sunyaev–Zeldovich (SZ) selected galaxy clusters, focusing on the redshift-space two-point correlation function (2PCF). We compared our measurements to theoretical predictions of the standard Λ cold dark matter (ΛCDM) cosmological model, deriving an estimate of the Planck mass bias,bSZ, and cosmological parameters.Methods.We measured the 2PCF of the sample in the cluster-centric radial ranger ∈ [10, 150] h−1Mpc, considering 920 galaxy clusters with redshiftz ≤ 0.8. A Markov chain Monte Carlo analysis was performed to constrainbSZ, assuming priors on cosmological parameters fromPlanckcosmic microwave background (CMB) results. We also adopted priors onbSZfrom external data sets to constrain the cosmological parameters Ωmandσ8.Results.We obtained (1−bSZ) = 0.62−0.11+0.14, which agrees with the value required to reconcile primary CMB and cluster count observations. By adopting priors on (1 − bSZ) from external data sets, we derived results on Ωmthat fully agree and are competitive, in terms of uncertainties, with those derived from cluster counts. This confirms the importance of including clustering in cosmological studies in order to fully exploit the information from galaxy cluster statistics. On the other hand, we found thatσ8is not constrained.
Prediction of Hypoglycemia in Diabetic Patients During Colonoscopy
Preparation
Authors: Lu Xiaohua , Xie Lingqiao , Zhao Wane , Zhang Chuangbiao , Luo Xixi , Zhou Yan 
Published: April 2023

Abstract
Objective To explore the clinical outcomes and establish a predictive
model of hypoglycemia during colonoscopy preparation for diabetic patients.
Methods Three-hundred ninety-four patients with diabetes who received
colonoscopy were retrospectively enrolled in this study and assigned to
hypoglycemia or non-hypoglycemia groups. Information about clinical
characteristics and outcomes during colonoscopy preparation was collected and
compared between the two groups. Logistic regression analysis was applied to
identify the risk factors of hypoglycemia. These risk factors were used to
construct a hypoglycemia predictive model verified by the receiver operating
characteristic (ROC) curve and Hosmer-Lemeshow goodness fit test.
Results Among 394 participants, 66 (16.8%) underwent a total of 88
hypoglycemia attacks during the bowel preparation. Grade 1 hypoglycemia
(≤3.9 mmol/L) comprised 90.9% (80/88) of
all hypoglycemia attacks and grade 2 hypoglycemia accounted for 9.1%
(8/88), signifying that grade 1 hypoglycemia is the most common type. No
severe hypoglycemia was identified. The incidence of nocturnal hypoglycemia was
15.9%. Logistic regression analyses revealed that the main risk factors
of hypoglycemia during colonoscopy preparation were postprandial C-peptide,
serum triglyceride, gender, type of diabetes mellitus, and insulin injection
frequencies. The area under the ROC curve of the hypoglycemia prediction model
was 0.777 (95% CI: 0.720–0.833).
Conclusion Diabetic patients are prone to develop mild to moderate
hypoglycemia during colonoscopy preparation. This study proposes a predictive
model that could provide a reference for identifying patients with a high risk
of hypoglycemia during colonoscopy preparation.
Spinal Cord Herniation into a Pseudomeningocele—A Delayed Presentation following a Traumatic Cervical Root Avulsion Injury
Authors: Patel Jay , Stewart James , Biswas Shubhabrata , Zaid Sarsam 
Published: April 2023

Abstract
Background Spinal cord herniation into a traumatic pseudomeningocele is a rare clinical entity. We present the sixth known case and describe surgical management.
Case Presentation A 44-year-old male presented with Brown-Sequard syndrome three decades after a cervical nerve root avulsion injury. Imaging revealed hemicord herniation into a C7/T1 pseudomeningocele in addition to extra-axial cord compression from further pseudomeningoceles. Significant clinical improvement was achieved following surgical repair. The radiological findings and technique for operative repair are described.
Conclusion The case highlights this rare pathology and presentation, describes the surgical measures for repair of cord herniation, and provides evidence for the favorable outcome that can be achieved by surgical intervention.
Coronaries from the Brachiocephalic Artery: Anomalous Origin of the Coronary Arteries in a Case of Situs Inversus and Truncus Arteriosus
Authors: Moharkar Swapnil , Bharati Alpa 
Published: April 2023

AbstractCongenital anomalies of the coronary arteries are rare. In this article, we reported a case of 6-month-old female who was brought with breathing difficulty and poor weight gain. Echocardiography was done which showed dextrocardia and truncus arteriosus. A cardiac computed tomography confirmed these findings and additionally revealed that the coronary arteries originated from a common vascular channel from the brachiocephalic artery. This is a very rare occurrence. To our knowledge, only a few such cases have been reported in the literature.