bluuebunny/crossref_metadata_2025_split huggingface dataset:
General endurance of first-year university students in the context of Covid-19 pandemics
Authors: Zanevskyy Ihor , Labartkava Kostiantyn , Sirenko Romana , Rybchych Ivan , Dulibskyy Andriy , Martyniv Oleh , Zakhidnyy Vasyl 
Published: November 2021

The Covid-–19 pandemics caused significant damage to the system of physical education of students. The purpose of this research was to create a practical model of general physical endurance of first-year university male students in the context of the pandemic of the corona virus. The testing was carried out during physical education classes, which took place according to the first academic year curriculum. The time of overcoming the 2000 meters course on the stadium treadmill was measured in September and in March of the academic year 2019-2020. During the research stage, the indicator of general endurance of students of all the three universities statistically significantly deteriorated. According to the results of ANOVA the absence of a statistically significant difference in the value of the indicator of general endurance between students of three universities both at the beginning and at the end of the research stage was revealed.
Keywords: Covid–19; endurance; modeling; students; testing
The Role of Mesenchymal Stromal Cells in the Management of Knee Chondral Defects
Authors: Bush Christopher J. , Grant John A. , Krych Aaron J. , Bedi Asheesh 
Published: November 2021

➤ Mesenchymal stromal cells (MSCs) are a subset of progenitor cells that help to promote tissue healing and regeneration through the secretion of various cytokines and growth factors. Although technically pluripotent, MSCs in vivo rarely repair damaged tissue through direct differentiation and engraftment.➤ Augmentation of traditional marrow stimulation techniques with MSCs has been theorized to improve repair tissue quality and defect fill. Clinical trials evaluating this technique are limited but have shown modest improvements compared with isolated marrow stimulation.➤ Various scaffolds also have been utilized in combination with MSCs to treat focal chondral defects. Although the techniques described are heterogeneous, many have shown promising early clinical outcomes.➤ Newer techniques involving 3-dimensional bioprinted scaffolds seeded with MSCs allow for the recreation of complex architecture, more closely resembling articular cartilage. These techniques are evolving and have not yet been studied in human clinical trials.
Subspecialty Selection Impacts Research Productivity and Faculty Rank of Academic Orthopaedic Surgeons
Authors: Haimowitz Sean , Veliky Jacob , Forrester Lynn Ann , Ippolito Joseph , Beebe Kathleen , Chu Alice 
Published: November 2021

Background:
Faculty promotion and research productivity are important for the overall career trajectory of academic orthopaedic surgeons. The purpose of this study was to investigate the role that subspecialty and demographic factors play in research productivity and academic advancement among orthopaedic surgeons.

Methods:
We conducted a retrospective cross-sectional analysis of academic rank among orthopaedic surgeons in 2018. We identified academic orthopaedic programs in the United States from the Fellowship and Residency Electronic Interactive Database (FREIDA) and collected publicly available data for surgeons, including fellowship training, gender, faculty rank, geographic region, and years since residency, from institutional websites. Research productivity was defined with the Hirsch index (h-index) from Scopus, and the m-index was calculated from the surgeon’s h-index and the date of the first publication. Multivariate regression analyses were performed to determine the variables that are associated with associate professorship, full professorship, and the h-index.

Results:
In this study, we identified and included 2,879 academic orthopaedic surgeons. Completion of a fellowship in foot and ankle (odds ratio [95% confidence interval]: 2.45 [1.17 to 5.15]), sports medicine (2.15 [1.12 to 4.15]), trauma (2.83 [1.42 to 5.66]), hand and upper extremity (2.20 [1.13 to 4.28]), musculoskeletal oncology (3.28 [1.49 to 7.21]), or upper-extremity reconstruction (3.20 [1.31 to 7.81]) was associated with associate professorship. Completion of a trauma fellowship was associated with full professorship (2.93 [1.27 to 6.77]). Completion of a fellowship in adult reconstruction (difference in least-squares means [95% confidence interval]: 5.01 [1.22 to 8.81]), sports medicine (4.52 [1.00 to 8.04]), spine (5.40 [1.63 to 9.18]), or upper-extremity reconstruction (10.64 [6.15 to 15.12]) or the completion of multiple fellowships (5.12 [1.27 to 8.94]) were independently associated with a higher h-index. Women had significantly lower h-indices than men at the assistant (median [interquartile range]: 3 [1 to 6] versus 4 [2 to 8]) and full professor (17 [12 to 26] versus 22 [13 to 34]) levels. There were no differences in the m-index between men and women at any academic rank.

Conclusions:
Orthopaedic subspecialty selection is independently associated with research productivity and academic rank. The differences in research productivity may be important to consider when evaluating orthopaedic surgeons for promotion. While female surgeons had lower h-indices than their male counterparts, this difference was not seen when using the m-index.
Cold Weather as a Risk Factor for Late Diagnosis and Surgery for Developmental Dysplasia of the Hip
Authors: Lee Wei Chun , Kao Hsuan Kai , Wang Shu Mei , Yang Wen E , Chang Chia Hsieh , Kuo Ken N. 
Published: November 2021

Update
This article was updated on February 11, 2022, because of a previous error. On pages 115 and 121, in the byline section and author affiliation section, “Wen E. Yang” now reads “Wen E Yang.”
An erratum has been published: J Bone Joint Surg Am. 2022 April 6;104(7):e30.

Background:
Newborn hip screening aims to prevent the late diagnosis of and subsequent surgical procedures for developmental dysplasia of the hip (DDH). Weather may affect how parents swaddle their babies in early life, but weather has never been formally regarded as a risk factor in hip screening. This study investigates the association between the incidence of surgically treated DDH and the outdoor temperature.

Methods:
Surgical procedures for late-diagnosed DDH were investigated in 12 birth-year cohorts (1999 to 2010) using the Taiwan National Health Insurance Research Database. The number of children who underwent a DDH-related surgical procedure between 6 months and 5 years of age per total live births was evaluated as an outcome of hip screening. Trend and regression analyses were used to determine the association between the incidence of surgically treated DDH and birth year, birth month, and the temperature during the birth month and first 3 months of life.

Results:
The mean incidence of surgically treated DDH was 0.48 per 1,000 live births (1,296 surgically treated patients per 2,712,002 live births). The incidence of surgically treated DDH among babies born in winter months (0.70 per 1,000) was significantly higher than that among babies born in summer months (0.32 per 1,000), and it was significantly correlated with mean temperature in the first 3 months of life (r2 = 0.91; p < 0.0001) and birth month (r2 = 0.68; p < 0.001). Multivariable regression revealed that external temperature in the first 3 months of life was the most significant factor (β = −0.034 [95% confidence interval, −0.042 to −0.022]; p < 0.001) for the incidence of surgically treated DDH (adjusted r2 = 0.485). The trend of seasonal differences remained the same throughout the study years following implementation of the hip-screening policy.

Conclusions:
As the incidence of surgically treated DDH is the ultimate outcome of newborn hip screening, cold weather should be regarded as a risk factor and should be incorporated into future screening programs. Weather patterns of different geographical areas should be studied to determine if children born in the winter are at an increased risk for requiring a surgical procedure for DDH, and newborn hip-screening programs should be revised accordingly.

Level of Evidence:
Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.
Home Hospital for Orthopaedic Surgery
Authors: Karhade Aditya V. , Chen Antonia F. , Makhni Melvin C. , Schwab Joseph H. , Simpson Andrew K. , Tsai Thomas C. 
Published: November 2021

Abstract:
Home Hospital (HH) is a clinical service involving the delivery of acute inpatient care in the home setting. Acute care services provided via HH include continuous telemonitoring, intravenous fluids and medications, nursing care, point-of-care imaging and laboratory tests, and in-person and virtual clinician visits. Despite offering an inpatient level of care, HH has lower fixed costs and less overhead than conventional hospital settings and offers rapid scalability. Originally implemented for acute medical conditions, HH has proven to be a safe and value-based care-delivery model for a variety of medical conditions, ranging from heart failure to chronic obstructive pulmonary disease exacerbations. For surgical conditions, HH represents an opportunity to reduce adverse hospital-acquired conditions, improve patient and caregiver satisfaction, and decrease cost. The patient profile of orthopaedic surgery inpatients matches that of patients who are most likely to benefit from HH—namely, those who are prone to functional decline, delirium, and nosocomial infections. A focus on surgeon leadership, quality and safety, and digital health with collection of patient-reported outcome measures (PROMs) will ensure that the potential of HH is realized as implementation and widespread rollout proceed.
The Borborema Strike-Slip Shear Zone System (NE Brazil): Large-Scale Intracontinental Strain Localization in a Heterogeneous Plate
Authors: Neves Sergio P. , Tommasi Andréa , Vauchez Alain , Carrino Thais Andressa 
Published: November 2021

Abstract
Large-scale strike-slip faults are fundamental tectonic elements of the continental lithosphere. They constitute plate boundaries (continental transforms), separate terranes with contrasting geological histories within accretionary orogens, or accommodate heterogeneous deformation in intracontinental settings. In ancient orogens, where deeper levels of the crust are exposed, these faults are expressed as shear zones materialized by up to tens of km-wide mylonitic belts. The Borborema shear zone system in northeastern Brazil is one of the largest and best-exposed intracontinental strike-slip shear zone systems in the world, cropping out over 250,000 km2. Here, we review its main geophysical, structural, petrologic, and geochronologic characteristics and discuss the factors controlling its development. This complex continental scale shear zone system is composed of a set of NE- to NNE-trending dextral shear zones from which there are two major E-trending dextral shear zones with horse-tail terminations into the transpressional belt branch, as well as several smaller E-trending dextral and NE-trending dextral and sinistral shear zones. The major shear zones are marked by extensive linear or curvilinear magnetic gradients, implying their continuation at depth. The major shear zones are materialized by migmatite to amphibolite-facies mylonites, but the entire system shows evidence of late deformation at lower temperatures. The system developed during the late stages of the Neoproterozoic Brasiliano (Pan-African) orogeny (mainly from 590 to 560 Ma), postdating by more than 20 Ma the main stage of contractional deformation. Localization of strike-slip shearing in this intraplate setting was controlled by rheological contrasts between blocks with distinct Paleoproterozoic histories, the presence of preorogenic Neoproterozoic rifts, the craton geometry, and zones of enhanced magmatic activity, highlighting the importance of rheological heterogeneity in controlling shear zone nucleation and evolution.
Evaluating Precision of Annular Pressure Buildup (APB) Estimation Using Machine-Learning Tools
Authors: Maiti Subhadip , Gupta Himanshu , Vyas Aditya , Kulkarni Sandeep D. 
Published: November 2021

Summary
Annular pressure buildup (APB) is caused by heating of the trapped drilling fluids (during production), which may lead to burst/collapse of the casing or axial ballooning, especially in subsea high-pressure/high-temperature wells. The objective of this paper is to apply machine-learning (ML) tools to increase precision of the APB estimation, and thereby improve the fluid and casing design for APB mitigation in a given well.
The APB estimation methods in literature involve theoretical and computational tools that accommodate two separate effects: volumetric expansion [pressure/volume/temperature (PVT) response] of the annulus drilling fluids and circumferential expansion (and corresponding mechanical equilibrium) of the well casings. In the present work, ML algorithms were used to accurately model “fluid density = f(T, P)” based on the experimental PVT data of a given fluid at a range of (T, P) conditions. Sensitivity analysis was performed to demonstrate improvement in precision of APB estimation (for different subsea well scenarios using different fluids) using the ML-based models.
This study demonstrates that, in several subsea scenarios, a relatively small error in the experimental fluid PVT data can lead to significant variation in APB estimation. The ML-based models for “density = f(T, P)” for the fluids ensure that the cumulative error during the modeling process is minimized. The use of certain ML-based density models was shown to improve the precision of APB estimation by several hundred psi. This advantage of the ML-based density models could be used to improve the safety factors for APB mitigation, and accordingly, the work may be used to better handle the APB issue in the subsea high-pressure/high-temperature wells.
Palaeogeography and Palaeoenvironments – A Multifield Examination of the Devonian-Permian Evolution of the Dneipr-Donets Basin
Authors: Banks Christopher James , Bodnaruk Bohdan , Kalmutskyi Vladislav , Seilov Yerlan , Zhiyenkulov Murat , Oni Olugbena 
Published: November 2021

Abstract
Context is everything. Not all thick sands pay out and not all thin sands are poorly productive. It is important to understand a basin's palaeogeographical drivers, the resultant palaeoenvironments and their constituent sedimentary architecture. Development of a depositional model can be predictive with respect to the magnitude of accessible pore space for potential development.
We present a multi-field study of the Dneipr-Donets basin. Over 600 wells were studied with &gt;4500 lithostratigraphical picks being made. Over 7500 sedimentological picks were made allowing mapping of facies bodies and charting shifts in facies types. A facies classification scheme was developed and applied. The Devonian-Permian sedimentary section records the creation, fill, and terminal closure of the Dneipr-Donets Basin:
Syn-rift brittle extension (late Frasnian-Famennian): intracratonic rifting between the Ukrainian Shield and Voronezh Massif formed a NW-SE orientated trough, with associated basaltic extrusion. Basin architecture consists of rotated fault blocks forming graben mini-basins. Sedimentation is dominantly upper shoreface but sand packages are poorly correlatable due to the faulted palaeotopography. Early Post-rift thermal subsidence (Visean-Lower Bashkirian): the faulted palaeotopography was filled and thermal subsidence drove basin deepening. Cyclical successions of offshore, lower shoreface and upper shoreface dominate. Sands are typically thin (&lt;10m) but can be widely correlated and have high pore space connectivity. Mid Post-rift: the Bashkirian (C22/C23 boundary), paralic systems prograde over the shoreface. Changes in vertical facies are abrupt due to a low gradient to basin floor. Deltaic and fluvial facies can produce thick amalgamated sands (&gt;30m), but access limited pore space because they are laterally restricted bodies. Terminal post-rift (Mykytivskan): above the lower Permian, the convergence of the Kazahkstanian and Siberian continents began to restrict the Dnieper-Donets basin's access to open ocean. The basin approached full conditions and deposition was dominated by evaporite precipitation, with periodic oceanic recharge. Ultimately, this sediment records the formation of Pangea.
The successions examined were used to construct a basinal relative sea level curve, which can be applied elsewhere in the basin. This can be used to help provide palaeogeographical context to a field, which in turn controls the sedimentary architecture.
The Importance of Seismic Attributes in Complex Area, Case Study from Vodianivske Field, Dnieper-Donets Basin, Ukraine
Authors: Khabanets Ivan , Medvedev Benjamin , D'Aguanno Carlo , Scapin Diego , Mantova Marco 
Published: November 2021

Abstract
The Dnieper-Donets Basin (DDB) is the principal producer of hydrocarbons in Ukraine and reserves are found in lower Permian and in Visean-Serpukhovian from Lower Carboniferous.
The Vodianivske field is located halfway between Poltava and Kharkiv in east Ukraine with proven reserves at depth of 5-6km. Previous studies based on legacy seismic data show thickness changes of the upper Visean towards the main structure and dim small-scale structures on the block boundary.
A recent 3D data reprocessing using 5D interpolation and advanced prestack time migration provides a broad frequency content image and imparts detailed high-resolution geological events. While traditional exploration is focused on gas traps in the Visean and below, current study aims to scan for potential traps in the Serpukhovian and above.
In order to reveal thin section features, multiple seismic attributes were tested, and spectral decomposition was found to be a powerful tool that delineated thin sand bodies in river valleys and allowed interpretation of high-resolution small-scale faults and pinch-outs not seen before.
Frequency tuning analysis on mapped horizons associated with upper Serpukhovian supported the presence of a large deltaic structure revealing SE-NW thin ∼1km wide sand body and developed set of crossing meanders. Similar approach was applied on legacy data expanding to the east and while seismic quality was limited, it was possible to identify a narrow ∼25km length meander and highlight a fault set.
Upon seismic attribute study we were able to identify and map thin units associated with sands that can be considered as future targets in hydrocarbon exploration in the area.
Understanding of Vertical and Horizontal Pressure Barriers in the Naturally Fractured Carbonate Field
Authors: Ibragimov Abdulmalik , Kalmuratov Nurbolat 
Published: November 2021

Abstract
The Karachaganak field is a massive reef carbonate structure. The main reservoir is of the late Devonian-Carboniferous age, where sequence stratigraphic cycles of progradation and aggradation defining the growth stages of the carbonate build-up have been revealed. Vertical and horizontal semiconductive barriers was identified in the reservoir during the field development. It was assumed that these barriers are located at the boundaries of the changing depositional cycles, which took place during the reef structure growth. According to the simulation results on a sector model of the reservoir it was determined that the pressure barriers can be developed due to different fracture intensities observed in the reservoir and not because of rock property as such. The reason for the different fracture densities may be associated with compaction during primary diagenesis and may have a sync-depositional nature, which can be seen on carbonate structure outcrops.
Experimental Investigation of Acoustic Atomization in Liquid Loading Horizontal Gas Wells
Authors: Al Munif Eiman , Miskimins Jennifer 
Published: November 2021

Abstract
Enhancing the production in liquid-loaded horizontal natural gas wells using an acoustic liquid atomizer tool is proposed as a possible artificial lift method. The more liquid that is converted to droplets, the more available gas is able to carry the liquid to the surface, resulting in an increase in production. The acoustic atomizer was selected to be the atomization device as it can create very small droplets at certain frequencies leading to a mist flow.
The contribution of this research includes obtaining experimental data using different laboratory procedures for horizontal and slightly inclined tubulars. Two-phase (gas and water) injection stream lines are joined to the test section to introduce gas and water at desired rates. An ultrasonic atomizer inside the test section is used to better understand the atomization mechanism as an artificial lift technique. Several experiments with varying factors influencing the acoustic properties are tested including varying liquid and gas rates, four different frequencies, two different flow pipe inclination angles, and two different acoustic device orientations.
The results show that when using frequencies of 62 and 62.5 kHz, the outcomes were almost identical for horizontal and slightly inclined pipe. Both frequencies reduced liquid film accumulation by 1% at lower (0.001 m/s) and higher (0.0168 m/s) liquid velocities while gas velocity was kept at 14 m/s. The performance of the acoustic tool was highly dependent on the orientation of the tool inside the flow loop due to its atomizer geometry, shape and size. Sprayers facing up (0°, original case) helped the droplets to be carried by the gas since the gas occupies the top portion of the pipe and did not block the atomizer. The sprayers failed to work while facing the bottom of the pipe (180°) due to water accumulating around the sprayers, plugging the atomizer and hindering it from working. Using an orientation of 90° (sprayers facing sideways) provided better results and positive impact in reducing the liquid film level. The efficiency of the tool decreases in slightly inclined wells. As more liquid quantity accumulated in the well, the atomization technique seems to be slow in reducing the liquid film height.
This research presents a set of diverse experimental data to suggest acoustic atomization might be used as a possible artificial lift technique in horizontal wells. The technique shows a 1-4% improvement which might be experimental error or in experimental control. Thus, the device used in the lab needs improvement to work as efficiently as other artificial lift techniques to possibly enhance production.