bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Finite Element Method in Time Domain to a Rotor System With Nonlinear Supports
Authors: Wang Liguo , Huang Wenhu , Hu Chao 
Published: November 2020

Abstract
A new method for analyzing periodic response of rotor dynamic system with nonlinear supports is presented in this paper. Based on a finite element formulation in the time domain, this method transforms nonlinear differential equations governing the dynamic behavior of rotor-bearing system into a set of nonlinear algebraic equations that can be reduced and calculated by the characteristic set of Wu elimination method. The analytic solution of the nodal displacement has been obtained finally. According to this result the behavior of periodic response is analyzed. The feasibility and advantage of the proposed method are illustrated with an example of flexible Jeffcott rotor-bearing system with nonlinear supports.
Coupling Vibration Analysis of Blood Vessels
Authors: Miao Jingliang , Liu Haixiang 
Published: November 2020

Abstract
This paper proposes and analyzes a simple dynamic model of blood vessel wall. By studying the coupled vibration of blood flow and vessel wall, one can get the natural frequency of a blood vessel. The method used here is generalized calculus of variations. The results show that the flexibility of blood vessels has a greater influence on the fundamental frequency of the coupled vibration and the viscosity of blood vessel has little effect on the frequency of the coupled vibration but has a greater effect on the amplitude of the vibration. Therefore it is important to control both the viscosity and flexibility of blood vessels.
Control of Magnetic Bearing Spindles During N-Waved Machining
Authors: Gosiewski Zdzislaw , Sawicki Jerzy T. , Bischof Kenneth R. 
Published: November 2020

Abstract
The parametric equations of the desired spindle shaft motion in tool plane are derived and the optimal motions of the shaft in the magnetic bearing planes are calculated. It is assumed that the non-circular orbit of the spindle shaft is a desired operating points set from a control system point of view, and this operation point is a known (i.e., programmed) function of time and angular position. The function is programmed in such a way, that its time constants are much bigger than time constants of the control system that should place the geometrical center of the shaft in the operation point, so dynamics of the programmed motion can be omitted. The parameters of linearized model of the open-loop system are strongly influenced by the position of the operating point. Therefore, the adaptive control system namely gain-scheduling method is designed.
Smart Structures: Gas Turbine Engine Applications
Authors: Fleeter Sanford , Lawless Patrick B. 
Published: November 2020

Abstract
This paper is directed at providing the smart structure technology community an introduction to aircraft gas turbine engines issues that might be addressed, i.e. smart/active propulsion systems. Specifically, in gas turbine engines, smart structures can (1) influence performance, stability, noise and high cycle fatigue by providing airfoil aerodynamic control, (2) alleviate or avoid high cycle fatigue due to flutter and forced response by introducing damping intra structures, and (3) provide health monitoring. However, the benefits-to-cost ratio of the added complexity of incorporating smart materials into gas turbine engines must be large as smart materials and actuator/control systems are not a simple solution to complex problems. The prime selling point of smart structure technology to current state-of-the-art gas turbine engines may be adaptability to age, mission, and the environment.
Using Triaxial Accelerometer Data for Vibration Monitoring of Helicopter Gearboxes
Authors: Tumer Irem Y. , Huff Edward M. 
Published: November 2020

Abstract
Typical vibration monitoring systems for helicopter gearboxes rely on single-axis accelerometer data. This paper investigates whether triaxial accelerometers can provide crucial flight regime information for helicopter gearbox monitoring systems. The frequency content of the three different directions is compared and analyzed using time-synchronously averaged vibration data. The triaxial data are decorrelated using a mathematical transformation, and compared to the original axes to determine their optimality. The benefits of using triaxial data for vibration monitoring and diagnostics are explored by analyzing the changes in the direction of the principal axis of vibration formed using all three axes of vibration. The statistical variation introduced due to the experimental variables is further analyzed using an Analysis of Variance approach to determine the effect of each variable on the overall signature. The results indicate that triaxial accelerometers can provide additional information about the frequency content of helicopter gearbox vibrations, providing researchers and industry with a novel method of capturing and monitoring changes in the baseline vibration signatures.
Modelling and Analysis of Frictional Phenomena in Dynamical Systems
Authors: Bogacz Roman , Ryczek Boguslaw 
Published: November 2020

Abstract
The paper deals with investigation of a self-excited vibrating system with dry friction. The system is composed of a mass connected by viscoelastic element with the referring frame and interacting with a moving belt by means of dry friction. An experimentally identified, multi-parametric dry friction model for the pair composed of soft and hard elements like steel-polyester pair, describing both the case of stick-slip and quasi-harmonic vibration, has been applied. Additionally, the system is influenced by external, two-frequency kinematic excitation. The results of computer simulation for different excitation conditions is submitted in the present paper.
Implementation, mechanisms of impact and key contextual factors involved in outcomes of the Modification of Diet, Exercise and Lifestyle (MODEL) randomised controlled trial in Australian adults: protocol for a mixed-method process evaluation
Authors: Anokye Reindolf , Radavelli-Bagatini Simone , Bondonno Catherine P , Sim Marc , Blekkenhorst Lauren C , Connolly Emma , Bondonno Nicola P , Schousboe John T , Woodman Richard , Zhu Kun , Szulc Pawel , Jackson Ben , Dimmock James , Schlaich Markus P , Cox Kay L , Kiel Douglas P , Lim Wai H , Devine Amanda , Thompson Peter L , Gianoudis Jenny , De Ross Belinda , Daly Robin M , Hodgson Jonathan M , Lewis Joshua R , Stanley Mandy 
Published: November 2020

IntroductionThe Modification of Diet, Exercise and Lifestyle (MODEL) study aims to examine the impact of providing visualisation and pictorial representation of advanced structural vascular disease (abdominal aortic calcification), on ‘healthful’ improvements to diet and lifestyle. This paper reports the protocol for the process evaluation for the MODEL study.Methods and analysisThe overall aim of the process evaluation is to understand the processes that took place during participation in the MODEL study trial and which elements were effective or ineffective for influencing ‘healthful’ behavioural change, and possible ways of improvement to inform wider implementation strategies. A mixed-method approach will be employed with the use of structured questionnaires and semistructured in-depth interviews. All 200 participants enrolled in the trial will undertake the quantitative component of the study and maximum variation sampling will be used to select a subsample for the qualitative component. The sample size for the qualitative component will be determined based on analytical saturation. Interviews will be digitally recorded and transcribed verbatim. Qualitative data will be analysed thematically and reported according to the Consolidated Criteria for Reporting Qualitative Research (COREQ) guidelines.Ethics and disseminationThe MODEL study process evaluation has received approval from Edith Cowan University Human Research Ethics Committee (Project Number: 20513 HODGSON). Written informed consent will be obtained from all participants before they are included in the study. The study results will be shared with the individuals and institutions associated with this study as well as academic audiences through peer-reviewed publication and probable presentation at conferences.Trial registration numberACTRN12618001087246.
Idiopathic Pulmonary Fibrosis Registry China study (PORTRAY): protocol for a prospective, multicentre registry study
Authors: Xie Bingbing , Ren Yanhong , Geng Jing , He Xuan , Ban Chengjun , Wang Shiyao , Jiang Dingyuan , Luo Sa , Chen Qihang , Liu Min , Feng Ruie , Zhao Ling , Dai Huaping , Wang Chen 
Published: November 2020

IntroductionIdiopathic pulmonary fibrosis (IPF) is a progressive and lethal lung disease characterised by a fibrotic histological pattern found in usual interstitial pneumonia. Its causes, pathogenesis, clinical phenotype and molecular mechanisms are poorly defined. Large-scale, multicentre studies are warranted to better understand IPF as a disease in China, its associated risk factors, clinical characteristics, diagnosis, disease progression and treatment.Methods and analysisThe Idiopathic Pulmonary Fibrosis Registry China Study (PORTRAY) is a prospective, multicentre registry study of patients with IPF in China. Eight hundred patients will be enrolled over a 36-month period and followed for at least 3 years to generate a comprehensive database on baseline characteristics and various follow-up parameters including patient-reported outcomes. Biological specimens will also be collected from patients to develop a library of blood, bronchoalveolar lavage fluid and lung biopsy samples, to support future research. As of 15 December 2019, 204 patients from 19 large medical centres with relatively high IPF diagnosis and treatment rates had been enrolled. Patient characteristics will be presented using descriptive statistics. The Kaplan-Meier method will be used for survival analyses. Repeated measures will be used to compare longitudinal changes in lung function, imaging and laboratory tests. Results following analysis have been projected to be available by July 2025.Ethics and disseminationThe study protocol was reviewed and approved by the Institutional Review Board from all the study sites currently recruiting patients. Study results will be published in peer-reviewed journals.Trial registration numberNCT03666234.
Effects of Creative Expressive Arts-based Storytelling (CrEAS) programme on older adults with mild cognitive impairment: protocol for a randomised, controlled three-arm trial
Authors: Lin Rong , Yan Yuan-Jiao , Zhou Yi , Luo Yu-Ting , Cai Zhen-Zhen , Zhu Kai-Yan , Li Hong 
Published: November 2020

IntroductionEarly non-pharmacological interventions can prevent cognitive decline in older adults with mild cognitive impairment (MCI). Creative expression (CrExp) can potentially mitigate cognitive decline and enhance the physical and mental health of older people. However, it is unclear whether activities involving CrExp can improve cognitive function and other health-related outcomes in older adults with MCI. The aim of the present study is to develop a Creative Expressive Arts-based Storytelling (CrEAS) programme that integrates verbal and non-verbal expressive activities and evaluate its effectiveness in improving cognitive function and other outcome indicators so as to explore its possible mechanism from the perspective of neuroimaging.Methods and analysisThis parallel randomised controlled trial with three arms (one intervention and two control arms) will be conducted over a 24-week period. A total of 111 participants will be enrolled and randomised to the CrEAS, recreation and usual activity groups. The CrEAS programme combines visual arts therapy and storytelling (TimeSlips) under the Expressive Therapy Continuum theoretical framework and provides an opportunity for people with MCI to actively engage in activities to improve cognitive function through verbal and nonverbal CrExp. Global cognitive function, specific domains of cognition (memory, executive function, language and attention) and other health-related outcomes (anxiety, depression and quality of life) will be measured at baseline, at the end of the intervention, and at the 24-week follow-up. Structural/functional brain MRI data will be collected at baseline and immediately after the intervention.Ethics and disseminationEthics approval was obtained from the Ethics Committee of Fujian Provincial Hospital (K2018-03-061). The study results will be disseminated through peer-reviewed journals and at academic conferences.Trial registration numberChiCTR1900021526.
Investigating a new tablet-based telerehabilitation app in patients with aphasia: a randomised, controlled, evaluator-blinded, multicentre trial protocol
Authors: Uslu Arif Sinan , Gerber Stephan M , Schmidt Nadine , Röthlisberger Carina , Wyss Patric , Vanbellingen Tim , Schaller Sandra , Wyss Corina , Koenig-Bruhin Monica , Berger Thomas , Nyffeler Thomas , Müri René , Nef Tobias , Urwyler Prabitha 
Published: November 2020

IntroductionAphasia is a common language disorder acquired after stroke that reduces the quality of life of affected patients. The impairment is frequently accompanied by a deficit in cognitive functions. The state-of-the-art therapy is speech and language therapy but recent findings highlight positive effects of high-frequency therapy. Telerehabilitation has the potential to enable high-frequency therapy for patients at home. This study investigates the effects of high-frequency telerehabilitation speech and language therapy (teleSLT) on language functions in outpatients with aphasia compared with telerehabilitative cognitive training. We hypothesise that patients training with high-frequency teleSLT will show higher improvement in language functions and quality of life compared with patients with high-frequency tele-rehabilitative cognitive training (teleCT).Methods and analysisThis study is a randomised controlled, evaluator-blinded multicentre superiority trial comparing the outcomes following either high-frequency teleSLT or teleCT. A total of 100 outpatients with aphasia will be recruited and assigned in a 1:1 ratio stratified by trial site and severity of impairment to one of two parallel groups. Both groups will train over a period of 4 weeks for 2 hours per day. Patients in the experimental condition will devote 80% of their training time to teleSLT and the remaining 20% (24 min/day) to teleCT, vice versa for patients in the control condition. The primary outcome measure is the understandability of verbal communication on the Amsterdam Nijmegen Everyday Language Test and secondary outcome measures are intelligibility of the verbal communication, impairment of receptive and expressive language functions, confrontation naming. Other outcomes measures are quality of life and acceptance (usability and subjective experience) of the teleSLT system.Ethics and disseminationThis study is approved by the Ethics Committee Bern (ID 2016-01577). Results will be submitted to a peer-reviewed journal.Trial registration numberNCT03228264.
Development of a risk prediction model of potentially avoidable readmission for patients hospitalised with community-acquired pneumonia: study protocol and population
Authors: Mounayar Anne-Laure , Francois Patrice , Pavese Patricia , Sellier Elodie , Gaillat Jacques , Camara Boubou , Degano Bruno , Maillet Mylène , Bouisse Magali , Courtois Xavier , Labarère José , Seigneurin Arnaud 
Published: November 2020

Introduction30-day readmission rate is considered an adverse outcome reflecting suboptimal quality of care during index hospitalisation for community-acquired pneumonia (CAP). However, potentially avoidable readmission would be a more relevant metric than all-cause readmission for tracking quality of hospital care for CAP. The objectives of this study are (1) to estimate potentially avoidable 30-day readmission rate and (2) to develop a risk prediction model intended to identify potentially avoidable readmissions for CAP.Methods and analysisThe study population consists of consecutive patients admitted in two hospitals from the community or nursing home setting with pneumonia. To qualify for inclusion, patients must have a primary or secondary discharge diagnosis code of pneumonia. Data sources include routinely collected administrative claims data as part of diagnosis-related group prospective payment system and structured chart reviews. The main outcome measure is potentially avoidable readmission within 30 days of discharge from index hospitalisation. The likelihood that a readmission is potentially avoidable will be quantified using latent class analysis based on independent structured reviews performed by four panellists. We will use a two-stage approach to develop a claims data-based model intended to identify potentially avoidable readmissions. The first stage implies deriving a clinical model based on data collected through retrospective chart review only. In the second stage, the predictors comprising the medical record model will be translated into International Classification of Diseases, 10th revision discharge diagnosis codes in order to obtain a claim data-based risk model.The study sample consists of 1150 hospital stays with a diagnosis of CAP. 30-day index hospital readmission rate is 17.5%.Ethics and disseminationThe protocol was reviewed by the Comité de Protection des Personnes Sud Est V (IRB#6705). Efforts will be made to release the primary study results within 6 months of data collection completion.Trial registration numberClinicalTrials.gov Registry (NCT02833259).
Impact of early surveillance on safety signal identification in the CathPCI DELTA study
Authors: Majithia Arjun , Matheny Michael E , Dani Sourbha S , Paulus Jessica K , Marinac-Dabic Danica , Robbins Susan , Ssemaganda Henry , Hewitt Kathleen , Ponirakis Angelo , Loyo-Berrios Nilsa , Moussa Issam , Drozda Joseph , Normand Sharon-Lise , Resnic Frederic S 
Published: November 2020

ObjectivesThe CathPCI Data Extraction and Longitudinal Trend Analysis study was designed to determine the feasibility of conducting prospective surveillance of a large national registry to perform comparative safety analyses of medical devices. We sought to determine whether the complementary use of retrospective case data could improve safety signal detection time.DesignWe performed a simulated surveillance study of the comparative safety of the Mynx vascular closure device (VCD) with propensity score matched alternate VCD recipients, using both retrospective and prospective cohort data.SettingCenters within the USA using the National Cardiovascular Data Registry (NCDR) CathPCI Registry.ParticipantsPercutaneous coronary intervention cases captured within the NCDR CathPCI Registry from July 1, 2009 to September 30, 2013 were included in the analysis.InterventionsNone.Main outcome measuresAbsolute and relative risk (RR) of any vascular complication (a composite of bleeding at access site, hematoma at access site, retroperitoneal bleeding, and other vascular complications requiring treatment); time to signal detection.ResultsA safety alert was detected for the primary outcome of “any vascular complication” after 15 months of surveillance and was sustained for the study duration (absolute risk of any vascular complication, 1.20% vs 0.73%, RR, 1.63; 95% CI 1.50 to 1.79; p<0.001). The safety signal was identified 12 months earlier with the use of retrospective case data than during the initial study.ConclusionsProspective, active surveillance of cardiovascular registries is feasible to perform comparative analyses of medical devices. Retrospective data may complement prospective surveillance to improve time to signal detection, indicating the need for earlier prospective application of safety surveillance for devices new to the market.
Occurrence and outcomes of type 3 endoleaks in endovascular aortic repair within the Vascular Quality Initiative database
Authors: Blakeslee-Carter Juliet , Beck Adam , Spangler Emily 
Published: November 2020

ObjectivesType 3 endoleaks (T3ELs) represent a lack of aneurysm protection from systemic pressure. Previous studies have found a ~2% incidence of T3EL after standard infrarenal endovascular aneurysm repair (EVAR); however, no prior studies with new-generation devices have been able to determine an association between T3EL and clinical outcomes. Here we examine T3EL within the Society for Vascular Surgery Vascular Quality Initiative (VQI) to define rates of occurrence, rates and modes of reintervention, and clinical consequences of these endoleaks.Design and settingParticipants receiving infrarenal EVAR in the VQI from January 2003 to September 2018 were analyzed in a retrospective cohort study.ParticipantsOf 42 246 entries in the EVAR procedural registry, 41 604 had complete procedural information and were included in analysis. Of these, 36 082 had long-term follow-up, and 26 422 had follow-up (9–21 months per VQI reporting standards) with complete endoleak data recorded.InterventionsAll patients included in this study underwent an infrarenal EVAR.ResultsWithin the VQI database, the rate of T3EL in infrarenal EVAR during index hospitalization was 0.37% (n=157/41 604), of which 85% were due to midgraft separation and 15% were due to fabric disruptions. Out of the 157 index hospitalization T3ELs, 4.5% (n=7) received procedural reintervention during that hospitalization, which accounted for 1% of all index hospitalization reinterventions. During the 21-month follow-up, the rate of incident T3EL was 0.7% (n=205/26 422), which accounted for 5% of all endoleaks seen during follow-up. Reinterventions for incident T3EL at follow-up were done in 30 patients (rate 0.1%), which accounted for 9% of endoleak reinterventions and 3.3% of all reinterventions. The presence of incident T3EL found during follow-up was associated with a significant decrease in 5-year survival (74% vs 80%, respectively; p=0.041) in Kaplan-Meier analysis.ConclusionT3ELs rates at placement and follow-up remain low; however, the majority reported in long-term follow-up are incident and these incident endoleaks are associated with decreased survival in EVAR.