bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical Simulation of the Flow Field and Pollutant Dispersion around a Hill under Different Thermal Stratifications
Authors: Guo Dong-Peng , Zhao Peng , Wan Ran , Yao Ren-Tai , Hu Ji-Min 
Published: October 2019

AbstractThis paper applied a commercial computational fluid dynamics code, STAR-CD, with the renormalization group k–ε turbulence model to simulate the flow and dispersion of contaminants released from a source on the windward side of a hill under different thermal stratifications. In the wake region, the influence of atmospheric stratification on the flow field is inconspicuous under neutral and unstable conditions because of the effect of mechanical disturbance. However, this influence becomes slightly conspicuous under stable conditions. When atmospheric stratification is stable, in the range of z/H < 1.0 (where z is height above the surface and H is height of the hill), the velocity deficits are smaller than those under neutral and unstable conditions. The maximum turbulence kinetic energy (TKE) appears in the wake regions, and the variation in TKE is significantly lower than that under neutral and unstable conditions. When atmospheric stratification is unstable, the vertical and horizontal spread of the plume is slightly greater than that under neutral and stable conditions and the maximum concentration is less than that under neutral conditions. When the Froude number is large (~11; Brunt–Väisälä frequency = 0.52), atmospheric stratification is slightly stable, the structure of flow around the hill is generally similar to that under neutral conditions, and the high-concentration regions are large on the windward side of the hill. Smaller high-concentration regions just appear on the windward side of the hill under unstable conditions. The pollutant concentrations in the wake region of the hill increase as a result of the effect of thermal stability, and the vertical spreading range of the plume along the downwind axis (x axis) is larger than that under neutral and stable conditions.
The Impacts of Automation on Present Weather–Type Observing Capabilities across the Conterminous United States
Authors: Landolt Scott D. , Lave Joshua S. , Jacobson Darcy , Gaydos Andrew , DiVito Stephanie , Porter Daniel 
Published: October 2019

AbstractIn the 1990s, the National Weather Service and the Federal Aviation Administration began deploying the Automated Surface Observing Systems (ASOS). These systems provided the capability to report real-time weather observations, including some types of present weather, as frequently as once every minute. Over 900 of these ASOS stations were installed across the United States, replacing most of the human observers. Despite the benefits offered, many issues were noted, including the inability to discern and report certain precipitation types, particularly drizzle, freezing drizzle, and ice pellets. These and other issues resulted in human observers being retained at roughly 130 ASOS airport locations around the country where high-quality weather observations are essential because of air traffic volume or other factors. The human observers at these locations work in conjunction with the ASOS, manually augmenting the automated weather observations when the ASOS provides erroneous data or when an ASOS observation is missing. To assess the impact of automation on present weather observations, the differences in present weather reports for two decades will be highlighted: 1979–88 (when only human observers reported the present weather observations) and 2005–14 (after the full ASOS network became operational). Comparisons between the decades will be further analyzed to determine the differences at the ASOS locations at which human observers were retained in the later decade, as well as the ASOS locations at which no humans were retained. Both the positive and negative impacts of automation, with an emphasis on aviation impacts, are presented.
The Relationship between Numerical Precision and Forecast Lead Time in the Lorenz’95 System
Authors: Cooper Fenwick C. , Düben Peter D. , Denis Christophe , Dawson Andrew , Ashwin Peter 
Published: October 2019

Abstract
We test the impact of changing numerical precision upon forecasts using the chaotic Lorenz’95 system. We find that in comparison with discretization and numerical rounding errors, the dominant source of errors are the initial condition errors. These initial condition errors introduced into the Lorenz’95 system grow exponentially at a rate according to the leading Lyapunov exponent. Given this information we show that the number of bits necessary to represent the system state can be reduced linearly in time without significantly affecting forecast skill. This is in addition to any initial reduction in precision to that of the initial conditions and also implies the potential to reduce some storage costs. An approach to vary precision locally within simulations, guided by the direction of eigenvectors of the growth and decay of forecast error (the “singular vectors”), did not show a satisfying impact upon forecast skill in relation to cost savings that could be achieved with a uniform reduction of precision. The error in a selection of ECMWF forecasts as a function of the number of bits used to store them indicates that precision might also be reduced in operational systems.
The Anterolateral Structure of the Knee Does Not Affect Anterior and Dynamic Rotatory Stability in Anterior Cruciate Ligament Injury: Quantitative Evaluation With the Electromagnetic Measurement System
Authors: Araki Daisuke , Matsushita Takehiko , Hoshino Yuichi , Nagai Kanto , Nishida Kyohei , Koga Hideyuki , Nakamura Tomomasa , Katakura Mai , Muneta Takeshi , Kuroda Ryosuke 
Published: October 2019

Background: The biomechanical function of the anterolateral structure (ALS), which includes the anterolateral joint capsule and anterolateral ligament (ALL), remains a topic of debate. Hypothesis: The ALS contributes to knee joint stability during the Lachman test and the pivot-shift test in anterior cruciate ligament (ACL)–deficient knees. Study Design: Controlled laboratory study. Methods: Fourteen fresh-frozen hemipelvis lower limbs were used. For 7 specimens, the anterior one-third of the ALS and the residual ALS were cut intra-articularly with a radiofrequency device. Subsequently, the ACL was cut arthroscopically. For the other 7 specimens, the ACL was cut first, followed by the anterior one-third of the ALS and the residual ALS intra-articularly. During the procedures, the iliotibial band (ITB) was kept intact. At each condition, the anterior tibial translation (ATT) during the manual Lachman test and the acceleration of posterior tibial translation (APT) and the posterior tibial translation (PTT) during the manual pivot-shift test were measured quantitatively with an electromagnetic measurement system. The mean values of those parameters were compared among 6 groups (ACL intact, one-third ALS cut, all ALS cut, ACL cut, ACL/one-third ALS cut, and ACL/all ALS cut). Results: The mean ATTs during the Lachman test and the mean APTs and PTTs in the ACL-cut conditions (ACL cut, ACL/one-third ALS cut, and ACL/all ALS cut) were significantly larger than those under the ACL-intact conditions (ACL intact, one-third ALS cut, all ALS cut) ( P < .01). However, no statistically significant differences were observed among the intact, one-third ALS–cut, and all ALS–cut conditions, within the ACL-intact or ACL-cut conditions. Conclusion: Intra-articular dissection of the ALS did not increase the ATT during the Lachman test or the APT and PTT during the pivot-shift test under the intact condition of the ITB, regardless of the integrity of the ACL. When the ITB is intact, the ALS does not have a significant role in either anterior or dynamic rotatory knee stability, while the ACL does. Clinical Relevance: Recent growing interest about ALL reconstruction or ALS augmentation may not have a large role in controlling either anterior or dynamic rotatory knee instability in isolated ACL-deficient knees.
Biomechanical Effects of Additional Anterolateral Structure Reconstruction With Different Femoral Attachment Sites on Anterior Cruciate Ligament Reconstruction
Authors: Katakura Mai , Koga Hideyuki , Nakamura Tomomasa , Araki Daisuke , Nagai Kanto , Nishida Kyohei , Kuroda Ryosuke , Muneta Takeshi 
Published: October 2019

Background: Recently reported anterolateral structure reconstructions (ALSRs) to augment intra-articular anterior cruciate ligament reconstruction (ACLR) use various femoral attachment sites, and their biomechanical effects are still unknown. Hypothesis: ALSR concomitant with ACLR would control anterolateral rotational instability better than ACLR alone, and if ALSR had different femoral attachment sites, there would be different effects on its control of anterolateral rotational instability. Study Design: Controlled laboratory study. Methods: Twelve fresh-frozen hemipelvis lower limbs were included. Anterior tibial translation during the Lachman test and tibial acceleration during the pivot-shift test were measured with a 3-dimensional electromagnetic measurement system in situations with the (1) ACL and ALS intact, (2) ACL and ALS cut, (3) ALSR without ACLR (ALSR alone), (4) ACLR without ALSR (ACLR alone), and (5) ALSR with ACLR. Three femoral attachment sites were used for ALSR: F1, 2 mm anterior and 2 mm distal to the lateral epicondyle; F2, 4 mm posterior and 8 mm proximal to the lateral epicondyle; and F3, over-the-top position for the lateral extra-articular tenodesis. The Steel test and Wilcoxon signed rank test were used for statistical analysis. Results: Anterior tibial translation during the Lachman test in the ACL and ALS–cut state was significantly larger than it was in the ACL and ALS–intact state, while its difference disappeared after ACLR. As for the pivot-shift test, additional ALSR with F2 to ACLR significantly decreased the acceleration ( P = .046), although additional ALSR with F1 and F3 showed no significant effect. Conclusion: ALSR with the femoral attachment site 4 mm posterior and 8 mm proximal to the lateral epicondyle in addition to ACLR played a role in reducing anterolateral rotational instability the most effectively among the measured attachment sites. Clinical Relevance: The present data will contribute to determine the appropriate femoral attachment site for ALSR to better control anterolateral rotational instability after ACL reconstruction.
Improving patient diary use in intensive care: A quality improvement report
Authors: Veloso Costa Asya , Padfield Olivia , Elliott Sarah , Hayden Paul 
Published: October 2019

Background Patients surviving critical illness are at risk of developing psychological symptoms that affect quality of life and recovery. Patient diaries may improve psychological outcomes by reducing gaps in memory and contextualising what has happened during admission. Factors including lack of guidelines, lack of awareness and time constraints may lead to poor diary use. Aims This quality improvement project aimed to increase diary provision and overall multidisciplinary team engagement with diaries for all patients admitted for over 72 h to an intensive care unit. Methods Trialled changes implemented via the ‘Plan-Do-Study-Act’ method included adding alerts to the online patient note system, providing education sessions and introducing a guidance document to facilitate entry completion. Results A ‘diary provision’ target of 100% was achieved (from a baseline of 26.1%). Simple changes have proven effective in establishing routine engagement with diaries, and lessons may be used to improve diary systems elsewhere.
Reproducibility and Reliability of Dynamic Ultrasound for Evaluating Tibiofibular Translation in the Sagittal Plane
Authors: Hagemeijer Noortje , Chang Song Ho , Saengsin Jirawat , Waryasz Gregory , Kerkhoffs Gino , DiGiovanni Christopher , Guss Daniel 
Published: October 2019

Category: Ankle Introduction/Purpose: Syndesmotic instability, when subtle, is challenging to diagnose and requires visualization of the syndesmosis during an applied stress. Ultrasound is a dynamic, non-invasive diagnostic tool that can do so at the point of care, but its reliability and reproducibility remain unclear. The aim of this study is to evaluate reliability and reproducibility of the dynamic use of ultrasonography, a safe and non-invasive imaging technique, for evaluating tibiofibular translation in the sagittal plane. Methods: Patients with no history of injury to either ankle were included in this study. The distal tibiofibular joint was examined using an ultrasound probe placed anteriorly with the patient in supine position, and posteriorly with the patient in prone position. Sagittal fibular translation was simulated by applying an increasing manual force to the fibula in the sagittal plane: 1) in supine position, anterior to posterior (SAP), 2) in prone position, posterior to anterior (PPA), and 3) in prone position, anterior to posterior (PAP) (Figure 1). Two examiners performed the dynamic examination independently to investigate reproducibility of the test. To test for reliability, the relative position of the fibula and tibia were subsequently measured by three observers; with no force application and at maximum force application, defined as the end point at which increased force did not result in additional fibular translation. Interrater reliability was tested using intraclass correlation coefficients (ICC). Results: In total 34 ankles among 17 patients were included, of which 24 ankles were male (71%). Mean subject age was 25.0 ± 5 years. Substantial agreement was found for all measurements. Anterior measurements of the distance between the ultrasound probe and the tibia and fibula demonstrated ICC’s of 0.98 and 0.98, respectively. PPA demonstrated ICC’s of 0.99 and 0.99, and PAP ICC’s of 0.99, and 0.99. To test for reproducibility the mean tibiofibular delta values of SAP, PPA, and PAP in neutral, and after maximum force application were compared between exams. Exam 1 vs exam 2: SAPneutral, coef. -0.001, p-value 0.895. PPAneutral, coef. -0.06, p-value 0.076. PAPneutral, coef. -0.01, p-value 0.957. SAPmaxforce, coef. -0.03, p-value 0.365. PAPmaxforce, coef. <-0.01, p-value 0.910, PPAmaxforce, coef. -0.08, p-value 0.028. Conclusion: Use of dynamic ultrasound is a reliable and accurate technique for measuring changes in sagittal translation of the tibiofibular joint. Substantial variation between right and left ankles of an individual subject is rare, underscoring the significant utility of the contralateral ankle as a control in the injury setting. This test affords a non-invasive means of diagnosing syndesmotic instability in the sagittal plane.
Acute Retrograde Tibiotalocalcaneal Nailing for Osteoporotic Ankle Fractures in Fragile Patients
Authors: Herrera-Perez Mario , Tejero-Garcia Sergio , Valderrabano Victor 
Published: October 2019

Category: Ankle, Trauma Introduction/Purpose: With the rising aging of the population, osteoporotic ankle fractures represent a frequent scenario in daily practice. The coexistence of comorbidities such as poorly controlled diabetes mellitus, vascular insufficiency, and poor condition of the surrounded soft tissues, means that conventional open reduction and internal fixation methods often fail. On the other hand, conservative or orthopaedic treatments in such population are badly tolerated. Our study aims to study the short- term outcome of retrograde tibiotalocalcaneal (TTC) nailing in a selected series of fragile patients. Methods: This study included 15 patients who underwent primary retrograde TTC nailing from January 2016 to July 2018. The mean age of the patients was 83,5 years (range, 75 to 88), and the mean follow-up period was 11,5 months (range, 6 to 24 months) with no patient lost to follow-up. All patients but one were diabetic; 2 were non-ambulatory; and 13 walked with walking aids. The authors implemented a primary nailing without addressing tibiotalar or subtalar joint and without using a tourniquet. Complete weight bearing was allowed early as tolerated. Alignment and healing of the fracture were evaluated. American Orthopaedic Foot & Ankle Society (AOFAS) hindfoot score were recorded preoperatively and at the final follow-up. Results: One of the patients died 8 months after the treatment. Radiographic healing of the fractures were identified in 100% of the cases. In 2 cases, a complete arthrodesis of the ankle joint was achieved by simple nail reaming (Figure 1). No infection or any scarring problems was recorded. Of the 13 patients who walked with difficulty, 4 remained prostrate to a wheelchair, but the rest maintained their previous autonomy. The mean AOFAS score improved from 48 (range, 14 to 71) preoperatively to 71 (range, 44 to 81) postoperatively. Conclusion: In the view of these results, we suggest that primary retrograde TTC nailing is a valid option in selected patients with fragility ankle fractures, high comorbidity, poor condition of the soft tissues and with difficulties to walk before the fracture. This option allows an early full weight bearing, avoids complications due to joint off-loading, and achieves acceptable functional results.
The Interosseous Talocalcaneal Ligament Injury Findings in Lateral Ankle Instability with Sinus Tarsi Pain
Authors: Jung Hong-Geun , Lee Jong-won , Song Won Tae 
Published: October 2019

Category: Ankle, Arthroscopy, Sports Introduction/Purpose: Lateral ankle instability (LAI) with concomitant sinus tarsi pain is a quite common finding. However, there has been few studies evaluating the subtalar arthroscopic findings for LAI with sinus tarsi pain. The purpose of the study is to evaluate the ST arthroscopic findings of chronic ankle instability with sinus tarsi syndrome. We hypothesized that chronic ankle instability with sinus tarsi pain is highly associated with interosseous talocalcaneal ligament (ITCL) tear which may be the cause for subtalar instability (STI). Methods: The study is based on 104 LAI with sinus tarsi pain ankles who had performed lateral ankle ligament stabilization. i.e. Modified Brostrum procedure (MBP), lateral ankle reconstruction (LAR) or subtalar ligament reconstruction (STR) with subtalar arthroscopic (STA) examinations from 2007 to 2018. The STA has been mainly focused on the ITCL injury and debridement of the ITCL tears and synovitis were performed when present. VAS pain score, AOFAS, Karlsson-Peterson functional score were evaluated. Results: According to the ST arthrosopic findings, ITCL tears were present in 94% (98/104) of the ankles. Lateral ankle instability (LAI), subtalar instability (STI), and LAI and STI combined were 32%, 30% and 38% respectively. MBP, LAR and STR were performed in 23%, 22% and 56% respectively. VAS pain score was improved from 5.3 to 1.9 (p<0.05). AOFAS score was improved from 67 to 89 (p<0.05), while K-P score improved from 50 to 83 (p<0.05). Sinus tarsi pain was relieved in 65% of the patients. Conclusion: We found the high incidence of the ITCL tears (98%) in LAI with sinus tarsi pain, and also diagnosed the STI in 68% of the ankles. We believe that in case of LAI with sinus tarsi pain, ST arthroscopic evaluation for ITCL tears is necessary and the possibility
Influence of Depressive Symptoms on Clinical Outcomes of Total Ankle Arthroplasty
Authors: Kim Tae Yong , Ahn Jungtae , Jeong Bi O 
Published: October 2019

Category: Ankle Arthritis Introduction/Purpose: Recently, there have been many reports on the relationship between depression and clinical outcome of knee or hip arthroplasty. However, there is no study on the association between depression and total clinical outcome of total ankle arthroplasty (TAA). This study investigated the relationship between depressive symptoms and clinical outcome after TAA. Methods: Forty patients who underwent TAA for end-stage ankle arthritis from July 2014 to July 2017 and were able to follow- up at least 12 months were selected. Depressive symptoms were evaluated using Center for Epidemiologic Studies Depression Scale (CES-D) and Patient Health Questionnaire-9 (PHQ-9). The subjects were divided into Depressive group and Non-depressive group, and the preoperative and postoperative clinical results were compared using a visual analogue scale (VAS), American orthopedic foot and ankle-hindfoot score (AOFAS). The preoperative and postoperative radiological results were also compared using anterior surface angle of distal tibia (TAS), talar tilt of ankle joint (TT), lateral surface angle of distal tibia (TLS), and heel alignment distance (HD). Results: The mean age of the patients was 61.6±18.2 years and the average follow-up period was 24.3±7.3 months. 13 subjects were in Depression group and 27 subjects were in Non-depression group. There was no statistical difference in baseline characteristics between the two groups. Additionally, there was no statistical difference in preoperative VAS and AOFAS between the two groups (p>.05). Preoperative and postoperative VAS and AOFAS showed statistically significant improvement in both groups (p<.05). However, the depressive group showed higher result in postoperative VAS than the Non-depressive group significantly (3.1±2.4 vs 1.4±2.3, p<.05). The postoperative AOFAS was also higher in the non-depressive group significantly (89.3±13.4 vs 95.0±8.1, p<.05). Both groups showed improvement in postoperative radiologic index. Preoperative and postoperative radiologic index showed no difference in both groups. Conclusion: The clinical outcome after TAA was poor in patients with depressive symptoms when compared to patients without depressive symptoms. Since depressive symptoms is a patient-specific factor that result in less improvement in clinical outcomes after TAA, clinical considerations for depressive symptoms are needed prior to TAA surgery.