bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Case of Acute Coronary Syndrome and Ischemic Stroke After Symptomatic Resolution of COVID-19
Authors: Rose Samuel D. , Salama Andrew , Bella Jonathan N. , Chilimuri Sridhar 
Published: July 2021

Abstract
Background:There is increasing evidence that thromboembolic events are a major cause of morbidity and mortality in COVID-19 patients. We present a case with two suspected thromboembolic events – acute coronary and ischemic stroke – after the resolution of infectious symptoms.Case Presentation:A 66-year-old male presented to the emergency department complaining of sudden onset of vision loss. He had no known medical history, but two weeks earlier presented to an outside hospital with fevers and was diagnosed with COVID-19. Brain CT revealed bilateral posterior cerebral artery territory infarcts, with subsequent MRA showing basilar artery attenuation as a likely source of embolization. Additionally, Troponin T was moderately elevated on admission (155 ng/ml) and reached a peak (1025 ng/mL) at 24 hours. Serial EKG showed dynamic changes since admission but the patient refused full cardiac workup. He was treated with dual anti-platelet therapy, high-intensity statin and ACE-inhibitor and was discharged with a stable visual deficit.Conclusions:A systemic coagulopathy from COVID-19 most likely caused two thromboembolic events in this patient. This case highlights the complex manifestations of coagulopathy caused by COVID-19 and the need for monitoring and treatment of thromboembolic events beyond the resolution of the acute infectious syndrome.
Thermal Finite Element Modelling of the Laser Beam Welding of Tailor Welded Blanks through an Equivalent Volumetric Heat Source
Authors: Busto Vito , Coviello Donato , Lombardi Andrea , De Vito Mariarosaria , Sorgente Donato 
Published: July 2021

Abstract
In last decades, several numerical models of the keyhole laser welding process were developed in order to simulate the joining process. Most of them are sophisticated multiphase numerical models tempting to include all the several different physical phenomena involved. However, less computationally expensive thermo-mechanical models that are capable of satisfactorily simulating the process were developed as well. Among them, a moving volumetric equivalent heat source, whose dimensions are calibrated on experimental melt pool geometries, can estimate some aspects of the process using a Finite Element Method (FEM) modelling with no need to consider fluid flows. In this work, a double-conical volumetric heat source is used to arrange a combination of two half hourglass-like shapes with different dimensions each other. This particular arrangement aims to properly assess the laser joining of a Tailor Welded Blank (TWB) even in case of butt joint between sheets of different thicknesses. Experiments of TWBs made of 22MnB5 steel sheets were conducted in both equal and different thicknesses configurations in order to validate the proposed model. The results show that the model can estimate in a satisfactory way the shape and dimensions of the fused zone in case of TWB made of sheets with different thickness.
Intelligent Tutoring System: A Bibliometric Analysis and Systematic Literature Review
Authors: Cuéllar-Rojas Oscar-Andrés , Hincapié Mauricio , Contero Manuel , Güemes-Castorena David 
Published: July 2021

Abstract
This article is a bibliometric analysis and literature review, having a central axis the evaluation mediated by Intelligent Tutors Systems (ITS) in education, seeking to establish state of the art on the implementations executed in the last 42 years and their impact on the evaluation process. It was based on a bibliometric analysis of 1,890 abstracts, allowing to establish the main information sources in the field. The first filter was carried out with R software and bibliometric techniques with a general search equation that allowed access to all the production of ITS registered in Scopus; this analysis used keywords and summaries. Subsequently, with the help of artificial intelligence, text mining was used to identify topics of interest in the scientific community, followed by new filtering. Finally, the selected full texts were analyzed with NVIVO software extracting emerging challenges in the field, obtaining 164 complete texts for analysis. Among the main findings, the primary purpose of evaluation in ITS was summative, peer evaluation and self-evaluation did not have the same level of importance as hetero evaluation, and ITS focus was quantitative; all this allowed us to conclude that the analyzed texts did not implement a holistic perspective.
Risk Assessment of Coal Mine Water Inrush Based On PCA-DBN
Authors: ye Zhang , Shoufeng Tang , Ke Shi 
Published: July 2021

Abstract
To provide an effective risk assessment of water inrush for coal mine safety production, a BP neural network prediction method for water inrush based on principal component analysis and deep confidence network optimization was proposed. Because deep belief network (DBN) is disadvantaged by a long training time when establishing a high-dimensional data classification model, the principal component analysis (PCA) method is used to reduce the dimensionality of many factors affecting the water inrush of the coal seam floor, thus reducing the number of variables of the research object, redundancy and the difficulty of feature extraction and shortening the training time of the model. Then, a DBN network was used to extract secondary features from the processed nonlinear data, and a more abstract high-level representation was formed by combining low-level features to find the expression of the nonlinear relationship between the characteristics of water inbursts. Finally, a prediction model was established to predict the water inrush in coal mines. The superiority of this method was verified by comparing the prediction of the actual working face with the actual situation in typical mining areas of North China.
Species Diversity in Penicillium and Acaulium From Herbivore Dung in China, and Description of Acaulium stericum Sp. Nov.
Authors: Su Lei , Zhu Hua , Sun Peilin , Li Xue , Yang Bochao , Gao Hong , Xiang Zhiguang , Qin Chuan 
Published: July 2021

Abstract
Penicillium and Acaulium species are common in the fresh of herbivore dung and can produce abundant secondary metabolism, which play important roles as decomposers of organic materials, food industry, and enzyme factories. Besides, the well-characterized diversity of dung fungi offers accessible systems for dissecting the function of fungi in gut and for exploring potential to produce high cellulases in herbivorous animal. During a survey of intestinal fungi from herbivorous animal in China, more than 400 were isolated, 38 belonging to Penicillium and 4 belonging to Acaulium were obtained from 12 healthy animals including marmot and chinchilla and selected for detailed study. Putative taxa were characterized by a multi-gene sequencing analysis testing the partial β-tubulin (TUB), the internal transcribed spacer rDNA (ITS), calmodulin (CAM), and RPB2, and a detailed phenotypic study. Penicillium strains were identified as six sections, 12 known species. In addition, four Acaulium isolates were identified as Acaulium album and Acaulium stericum sp. nov. based on morphology and phylogeny of multi-gene sequences. This study shows that the species diversity of Penicillium on herbivore dung has not been widely studied and that seems to be a good source of offers opportunities for discovery of new cellulases from microbial communities.
Robust vibration-activated lubricity
Authors: Bhattacharjee Arnab , Garabedian Nikolay , Borovsky Brian , Burris David Lawrence 
Published: July 2021

Abstract
Friction can be reduced or eliminated when the contact interface is subjected to an external vibration; we refer to this phenomenon here as vibration-activated lubricity. According to prior literature, vibration-activated lubricity is limited to oscillation amplitudes and frequencies that depend strongly on case-specific experimental variables such as the instrument resonance frequency, sliding speed, and slip length of the tribo-pair. This paper aims to overcome these limitations and clarify their origins. Specifically, we used a quartz crystal microbalance (QCM) to directly oscillate the sample at a fixed frequency and at oscillation speeds that exceeded the sliding speed by orders of magnitude. Under these direct oscillation conditions, vibration-activated lubricity persisted for alumina probes ranging from 50-1500 µm in diameter, loads from 20 µN − 5 mN, speeds from 5 µm/s − 1 mm/s, gold and single crystal molybdenum disulfide samples, and two instruments – a custom microtribometer and a commercial atomic force microscope. Under all conditions, vibration-activated lubricity was characterized by very small but non-vanishing friction coefficients (~ 0.01–0.05). Our findings suggest that the following criteria satisfy the conditions for robust vibration-activated lubricity: (1) direct coupling between the oscillator and the sample; (2) probe inertial or spring forces > > available friction; (3) oscillation speed > > sliding speed; (4) oscillation amplitude ≅ or > the slip length.
The Validity and Reliability of the Serbian Version of the Smartphone Addiction Scale – Short Version
Authors: Nikolic Aleksandra , Bukurov Bojana , Kocic Ilija , Soldatovic Ivan , Mihajlovic Sladjana , Nesic Dejan , Vukovic Milica , Ladjevic Nikola , Grujicic Sandra Sipetic 
Published: July 2021

Abstract
Background: In recent years, the need for validated and reliable questionnaires for different applications could be observed throughout scientific literature. To add to this trend, we translated into Serbian the Smartphone Addiction Scale-Short Version (SAS-SV) and tested it for its psychometric properties. This study's main aims were to test the Serbian version of the SAS-SV's internal consistency and reliability and estimate smartphone addiction prevalence among medical students. Methods: The study was conducted in December 2018 on a representative sample of third-year medical students. The cross-cultural adaptation was performed following the well-established guidelines for cross-cultural adaptation of self-reported measures. For test-retest reliability, students filled the questionnaire twice, within seven days. Results: The Serbian version of SAS-SV showed good internal consistency (Cronbach's alpha = 0.89) and excellent reliability for test-retest scores (ICC = 0.94, 95% CI = 0.92-0.96). Factor analysis supported the extraction of one factor, which explained 51,5% of the variance. To explore construct validity furthermore, SAS-SV was correlated with time indicators of smartphone use. According to cut-off values for the SAS-SV score, 19.5% of students could be regarded as “addicted” and often spent more time on smartphones and social networks on working days and weekends than “not addicted” students. Conclusion: The SAS-SV in the Serbian version is a reliable and valid instrument for detecting smartphone addiction among university students. Further research on this issue is encouraged to enable a better understanding of this ever-increasing public health issue.
Efficacy of Chemotherapy for Malignant Pleural Mesothelioma According to Histology
Authors: Cedres Susana , Assaf Juan David , Iranzo Patricia , Callejo Ana , Pardo Nuria , Navarro Alejandro , Martinez-Marti Alex , Marmolejo David , Rezqallah Alejandra , Carbonell Caterina , Frigola Joan , Amat Ramon , Pedrola Anna , Dienstmann Rodrigo , Felip Enriqueta 
Published: July 2021

Abstract
PurposeCheckMate 743 trial demonstrated survival benefit of immunotherapy in first line in MPM with some differences in the efficacy of chemotherapy according to histology. The objective of this study is to characterize the impact of chemotherapy according to histology in patients diagnosed with MPM at our institution. MethodsClinical records of all MPM patients diagnosed at Vall d´Hebron University Hospital between November 2002 and April 2020 were reviewed. Associations between clinical variables and outcomes were assessed with Cox regression models. Survival data were calculated by the Kaplan-Meier method. Results189 patients were included with 76% of tumors classified as epithelioid subtype. First line chemotherapy was offered to 85% of patients. Median survival in overall population was 21.3 months (95%CI17.2-24.3). We found that patients with epithelioid tumors had better overall survival (OS) and progression free survival (PFS). Median OS of epithelioid patients treated with first line chemotherapy was 26.7 months versus 15.0 months in nonepithelioid patients (HR2.25 CI95% 1.4-3.4; p<0.001). Median PFS for patients with epithelioid tumors treated with chemotherapy was 4.8 months versus 3.6 months in nonepithelioid (HR1.5 CI95% 1.0-2.3; p=0.03). The improvement of outcomes in patients with epithelioid histology was detected in patients treated with cisplatin or carboplatin. Histology was not a predictive factor for the platinum agent sensitivity (p of interaction PFS=0.09, p of interaction OS=0.65). Conclusions In our series, patients with nonepithelioid tumors presented worse prognosis. Although epithelioid tumors exposed to cisplatin had higher PFS, histology was not a clear predictor of chemotherapy efficacy.
Evaluation and Experience of the Anterior Approach for Coronal Plane Elbow Fractures
Authors: Jia Qiyu , Li Xiangxiang , Zhan Jing , Chen Dongsheng , Liu Kai , Wang Yingbo , Yusufu Aihemaitijiang , Ma Chuang 
Published: July 2021

Abstract
Background: The existing approaches to treating elbow fractures include anterior, external, internal, and posterior approaches. Of these, the anterior approach is often not chosen by surgeons to avoid damaging important nerves and blood vessels. In fact, the anterior approach has unique advantages. The purpose of this study was to report the outcomes in 38 patients with coronal plane elbow fractures treated through the anterior approach.Methods: We retrospectively analyzed 38 cases of coronal plane elbow fractures treated through an anterior approach at our institution between March 2015 and July 2019. The length of the surgical incision, operation time, intraoperative blood loss, and postoperative complications were recorded. The range of flexion, extension, and rotation of the affected elbow and the healthy elbow were collected at follow-up. Functional outcomes were evaluated using the Mayo Elbow Function Score (MEPS).Results: All 38 patients were followed up. At the final follow-up, solid osseous union was confirmed for all coronal plane elbow fractures. The mean elbow flexion arc was 129.26 ± 6.9 degrees, and the extension arc was 8.87 ± 6.13 degrees. The mean pronation arc was 83.45 ± 2.9 degrees, and the supination arc was 80.05 ± 2.92 degrees. The mean MEPS was 90.0±7.53 points, with 18 excellent cases and 20 good cases. There was no significant difference in elbow extension, flexion, and pronation between 31 cases of single fracture and the healthy elbow (P > 0.05); the arc of supination was slightly worse than that of the healthy elbow (P < 0.05). The VAS pain scores of the patients before the operation, three months after the operation, and during follow-up were compared. The pain of the patients was significantly reduced after treatment (P < 0.05). Two patients experienced transient postoperative median nerve paralysis, from which they recovered within three months. One patient had mild heterotopic ossification and was not treated because it did not affect the function of the elbow joint. All patients returned to work and were satisfied with the treatment.Conclusion: The anterior approach has the benefits of simplicity, safety, minimal invasion, excellent exposure, and satisfactory prognosis for coronal plane elbow fracture.
Obesity and Non-Obesity Obstructive Sleep Apnoea Hypertension Syndromes (OOHS &amp; NOOHS): New Clinical Discoveries
Authors: Hu Chunsong , Wu Qinghua , Li Juxiang , Wu Yanqing , Wang Menghong , Ge Yuzhi , Tian Xiaoli , Tkebuchava Tengiz , Hollands Peter , Hu Dayi 
Published: July 2021

Abstract
Obesity, obstructive sleep apnoea (OSA) and hypertension are common clinical risk factors. Their coexistence is termed Obesity and Non-Obesity OSA Hypertension Syndromes (OOHS & NOOHS) due to high linkage. This study reported the clinical characteristics of OOHS and NOOHS. A total of 163 patients, aged 23–74 years, were randomly enrolled at the outpatients department who were either obese or non-obese, suffered OSA and hypertension. Subjects with a Body Mass Index (BMI) of ≥25 (Chinese criteria), of ≥27 (criteria of this study), and of ≥30 (WHO criteria) were defined as obese or non-obese, respectively. Cases with snoring were classified as mild, moderate and severe OSA by using the Apnoea-Hypopnoea Index where mild is 5–15, moderate is 15–30, and severe is > 30. Daytime blood pressure (BP) was measured to assess any correlation. Data from those with isolated obesity, OSA, hypertension, and metabolic syndrome were compared. Long-term follow-up was carried out. 7 typical cases with OOHS and NOOHS were assessed and included general patient information, initial diagnosis, medical history, related risk factors, BMI, and BP. 163 cases with OOHS and NOOHS often have similar or different clinical characteristics. Both potentially suffer from Major Adverse Cardiovascular Events (MACE) which are associated with increased BMI, OSA, and increased BP. Long-term follow-up showed the outcomes consistently linked to their lifestyle and adherence to treatment. Our new clinical discoveries suggest that both OOHS and NOOHS are high risk factors in MACE. There is an urgent need for early lifestyle interventions and related treatments.
A method for bearing fault diagnosis of mine hoist using convolutional attention autoencoder
Authors: Zhang Jie , Yang Ke , Jiang Yuanyuan , Xia Ling 
Published: July 2021

Abstract
In view of the complex environment and frequent faults in the actual operation of mine hoist, a fault diagnosis method based on Convolution Attention Autoencoder (CAAE) is proposed through theoretical analysis and experimental verification to improve the diagnostic stability of mine hoist under strong noise. First, a CAAE is constructed, which uses a combination of a convolutional neural network (CNN) and a channel attention module (CAM) to compress and encode the input signal, and then the input signal is reconstructed by a decoder to train the CAAE to extract the original signal fault features. Then, a fault diagnosis classifier is constructed to classify different fault patterns. Finally, experimental validation is performed with the Case Western Reserve University bearing dataset. The results show that the method has a strong feature extraction capability and a high classification accuracy for bearing failure modes compared with existing methods. And the experiments on the application effect of the proposed method in noisy environment are conducted to verify that the method is highly effective and challenging.
Discussion on a methodology for the digital reconstruction of complex fault structures in coal mines
Authors: Wang Hongwei , Wang Zeliang , Jiang Yaodong , Song Jiaqi 
Published: July 2021

Abstract
The visualization of complex geological structures can provide technical support for accurate prediction and prevention of coal mine disasters. Taking fault structure as an example, this study proposes a new digital reconstruction method to realize the visualization of geological structure. The methodology for the digital reconstruction of complex fault structures is composed by the following four aspects, including collection and fidelity of multi-physical field data of fault structure, transmission of multi-physical field data, multi-physical data normalization and digital model of fault structures. The key scientific issues of this methodology to be resolved includes in-situ fidelity of multi-field data and normalized programming of multi-source data. In addition, based on the geological conditions in Da 'anshan coal mine in the mining area of western Beijing, China, this paper makes a preliminary attempt to establish a digital model of fault and fold structures by this methodology.
Nanocomposites For Optical Properties and Effective Photocatalytic Degradation of Pollutants in Water
Authors: Hamad D. , Uddin Mohammad Kashif , Rashad M. , Ahmed Sameh S. 
Published: July 2021

Abstract
In this study, chromium (III) oxide (Cr2O3) and potassium oxide (K2O) nanoparticles (NPs) were synthesized by combustion. Mixed oxides of varying concentrations in the form of (1-x)Cr2O3/xK2O (x = 0.1, 0.3, 0.5, and 0.7) were prepared. X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), and optical measurements were used to investigate the properties of these nanoparticles. XRD indicates that the grain size decreased as the K2O content increased. Additionally, HR-TEM revealed several types of shapes, such as hexagonally-shaped nanoparticles. The optical measurements showed a blue shift indicating a minor modification to the band structure during the Cr2O3/xK2O mixing. The (1-x)Cr2O3/xK2O nanoparticles were used as catalysts in wastewater during a photocatalytic process. Orange G was chosen as an impurity in the water. The absorbance curves of Orange G in the water were measured at different times in the presence of the same quantity of Cr2O3/xK2O NPs. After 120 min, the efficiency reached 13% and 38% for (1-x)Cr2O3/xK2O NPs with x = 0.1 and 0.7, respectively. The experimental results were analyzed by pseudo first- and second-order models and intra-particle diffusion models. A first-order kinetic model had the best fit for the (1-x)Cr2O3/xK2O NPs. The strongest relationship occurred with a composition of 0.1Cr2O3/0.7K2O.
A Functional Perspective for Reef Benthic Communities: Temporal Trends in the Only Atoll in Southern Atlantic
Authors: Picolotto Vitor André Passos , Aued Anaide W. , Macedo-Soares Luis C. P. , Zamoner Julia Biscaia , Segal Bárbara 
Published: July 2021

Abstract
Reef benthic communities provide many important ecosystem functions such as nutrient cycling, carbonate accretion and tridimensional complexity. Yet, reefs worldwide face an uncertain future, being threatened by local and global impacts. As an alternative approach to evaluate communities’ changes, functional ecology aims to understand how species shape the environment and how functions conduct ecosystems’ dynamics. The aim of this study was to investigate the temporal dynamics (2013–2019) of the reef benthic community in the most pristine reef in Brazil, Rocas Atoll, using a functional diversity approach. We identified 48 organisms grouped into 17 functional entities (according to their traits’ combination), considering all sampling years. Benthic community was temporally dominated by functional entities responsible for providing low reef tridimensional complexity (represented mainly by turf algae). This dominance reflected in low values of functional entropy, due to uneven abundances distribution between unique functional entities, those that have unique trait combination. Functional richness oscillated over years, but did not show great changes in functional spaces, maintaining an equity in the number of functional entities and indicating stability of reef functions in Rocas Atoll, even with unequal abundances’ distribution. Our study is the first to use a functional approach in temporal scale and represents a baseline for South Atlantic, since it provides the actual state of reef benthic communities using a functional approach, in an environment with no direct anthropic impacts. This can help to predict the effects on some ecosystem functions caused by local and global changes and its consequence for ecosystem services.