bluuebunny/crossref_metadata_2025 huggingface dataset:
The evaluation of the distance between the popliteus tendon and the lateral collateral ligament footprint and the implant in Total Knee Arthroplasty using a 3-dimensional template.
Authors: Takubo Akihito , Ryu Keinosuke , Iriuchishima Takanori , Nagaoka Masahiro , Tokuhashi Yasuaki , Aizawa Shin
Published: June 2020

Background
When surgeons perform TKA, popliteus tendon (PT) and lateral collateral ligament (LCL) iatrogenic injuries are a risk because the femoral attachments are relatively close to the bone resection area. The purpose of this study was to evaluate the distance between the PT or LCL footprint and the TKA implant using a 3D template system and to evaluate any significant differences according to the implant model.
Methods
Eighteen non-paired formalin fixed cadaveric lower limbs were used. All the surrounding soft tissue except the PT, ligaments and meniscus were removed from the knee. Careful dissection of the PT and LCL was performed, and the femoral footprints were detected. Each footprint periphery was marked with a K-wire. CT scanning was then performed. The data was analyzed with a 3D template system. This simulation models for TKA were the Journey II BCS and the Persona PS. The area of each footprint, and the length between the most distal and posterior point of the lateral femoral condyle and the edge of each footprint were measured. Matching the implant model to the CT image, the shortest length between each footprint and the osteotomy area were calculated.
Results
The area of the PT and LCL footprints was 38.7±17.7mm 2 and 58.0±24.6mm 2 . The length between the most distal and posterior point of the lateral femoral condyle and the edge of the PT footprint was 10.3±2.4mm and 14.2±2.8mm. The length between these same points and the edge of the LCL footprint was 16.3±2.3mm and 15.5±3.3mm. Under TKA simulation, for the Journey II BCS and the Persona PS, the shortest length between the PT footprint and the osteotomy area was 4.3±2.5mm and 3.2±2.9mm, and the shortest length between the LCL footprint and the osteotomy area was 7.2±2.3mm and 5.6±2.1mm. The PT attachment was damaged by the bone resection of the Journey II BCS and the Persona PS TKA in 3 and 9 knee.
Conclusion
The PT and LCL femoral attachments existed close to the femoral bone resection area of the TKA. Careful attention is needed to avoid damage to the PT and LCL during surgical procedures.
TV2++: A Novel Spatial-Temporal Total Variation for Super Resolution with Exponential-type Norm
Authors: Deng Lizhen , Zhou Zhetao , Xu Guoxia , Zhu Hu , Bao Bing-Kun
Published: June 2020

Recently, many super-resolution algorithms have been proposed to recover high resolution images to improve visualization and help better analyze images. Among them, total variation regularization (TV) methods have been proven to have a good effect in retaining image edge information. However, these TV methods do not consider the temporal correlation between images. Our algorithm designs a new TV regularization (TV2++) to take advantage of the time dimension information of the images, further improving the utilization of useful information in the images. In addition, the union of global low rank regularization and TV regularization further enhances the image super resolution recovery. And we extend the exponential-type penalty (ETP) function on singular values of a matrix to enhance low-rank matrix recovery. A novel image super-resolution algorithm based on the ETP norm and TV2++ regularization is proposed. And the alternating direction method of multipliers (ADMM) is applied to solve the optimization problems effectively. Numerous experimental results prove that the proposed algorithm is superior to other algorithms.
Coverage of Community Case Management for Malaria through CHWs: A Quantitative Assessment using Primary Household Surveys of High-burden Areas in Chhattisgarh state of India
Authors: Garg Samir , Gurung Preeti , Dewangan Mukesh , Nanda Prabodh
Published: June 2020

Background
Community case management of malaria (CCMM) has been implemented through community health workers (CHWs) in many countries. Existing studies have shown that CHWs can be viable means of implementing CCMM. However, not many studies have examined the coverage under large-scale CCMM programmes. India is a big contributor to global malaria burden. Chhattisgarh is a leading state in India in terms of malaria incidence and mortality. CCMM was implemented on a large scale through the ‘mitanin’ CHWs in rural Chhattisgarh from 2015. Under CCMM, 37696 CHWs in 84 high-burden administrative blocks of the state were trained and equipped with rapid diagnostic tests (RDT), artemisinin-based combination therapy (ACT) and chloroquine.
Methods
This descriptive quantitative study assesses coverage of CCMM in detection and treatment of Malaria over three rounds of household surveys - 2015, 2016 and 2018. Household-interviews covered more than 15,000 individuals in each round, using multi-stage random sampling across the 84 blocks. The main objectives were to find out the coverage in identification and treatment of malaria and the share of CHWs in them. A 15-days recall was used to find out cases of fever and healthcare sought by them.
Results
In 2018, 62% of febrile cases in rural population contacted CHWs. RDT, ACT and chloroquine were available with 96%, 80% and 95% of CHWs, respectively. From 2015 to 2018, the share of CHWs in testing of febrile cases increased from 34% to 70%, while it increased from 28% to 69% in treatment of malaria cases. CHWs performed better than other providers in treatment-completion and administered medication under direct observation to 72% of cases they treated.
Conclusion
This study adds to one of the most crucial but relatively less reported area of CCMM programmes, i.e. the extent of coverage of the total febrile population by CHWs, which subsequently determines the actual coverage of case-management in malaria. Mitanin-CHWs achieved high coverage and treatment-completion rates that were rarely reported in context of large-scale CCMM elsewhere. Close to community, well-trained CHWs with sufficient supplies of rapid tests and anti-malarial drugs can play a key role in achieving the desired coverage in malaria-management.
Prospective Cardiovascular Magnetic Resonance Imaging in Adults with Alström Syndrome: Silent Progression of Diffuse Interstitial Fibrosis.
Authors: Baig Shanat , Dowd Rory , Edwards Nicola C , Hodson James , Fabritz Larissa , Vijapurapu Ravi , Liu Boyang , Geberhiwot Tarekegn , Steeds Richard P
Published: June 2020

Background
Alström syndrome (ALMS) is a rare ciliopathy characterised by early onset insulin resistance, obesity, and dyslipidaemia and is a model for diseases that have huge social, health and economic impact. Cardiomyopathy develops in the majority, with high rates of morbidity and mortality, the definitive feature of which is the presence of coarse replacement fibrosis and diffuse myocardial fibrosis (DIF). The pathogenesis of heart failure is thought to involve fibroblast accumulation and expansion of the extracellular matrix with excess protein deposition, leading to distorted organ architecture and impaired contractile function. Consecutive adults with genetically proven ALMS attending the National Centre for Rare Disease in Birmingham, England were studied. All patients underwent serial CMR, echocardiography and venous blood sampling following standard clinical practice, with computed tomography coronary angiography (CTCA) performed to assess severity of CAD. The aims of this study were: 1) to evaluate changes over time in DIF by cardiovascular magnetic resonance tissue characterization in ALMS; 2) to examine whether changes in DIF are associated with alteration in systolic or diastolic function; and 3) to evaluate the frequency and severity of coronary artery disease as a confounder for progression of ischaemic versus non-ischaemic fibrosis.
Results
In total, 30/32 adults (63% male; 67% White British) participated. The median age at first scan was 21.3 years (interquartile range: 19.0-32.6) and participants were followed for a maximum of 67 months. Only 4 patients had significant coronary artery stenosis on post-mortem, invasive or CTCA. Mid short axis myocardial T1 times, myocardial extracellular volume, and left ventricular mass increased significantly over time, by an average of 21.8ms (95% CI 17.4 – 26.1; p<0.001), 0.011 (0.006 – 0.016, p<0.001), and 2.8 g/m 2 (1.9 – 3.7; p<0.001) per year, respectively. These changes were not associated with significant deterioration in myocardial structure or function.
Conclusions
This is the first comprehensive prospective study demonstrating progression of DIF in ALMS over time, although no structural or functional consequences were noted within a median three and a half years’ follow up. Further study is warranted to define whether DIF is a by-stander or the driver to impaired contractile function, heart failure and death.
Examining Students’ Continuance Usage Intention for Web-based Educational Tools: A Developed Integrated Structural Model Approach
Authors: Yaakop Azizul Yadi , Mahadi Nomahaza , Ariffin Zailin Zainal , Abu Hasan Zuha Rosufila , Harun Madzli
Published: June 2020

The primary objective of this study is to examine an integrated model of continuance intention within the context of task-technology fit (TTF) model and technology acceptance model (TAM); to empirically test this integrated model in explaining students’ continuance usage intention of web-based educational tools. To this end, Malaysia’s Ministry of Education has set a theme of Higher Education 4.0: Knowledge, Industry and Humanity as a pledge in the effort to revamp the higher education ecosystem in Malaysia. The elements, inter alia, is to implement 21st century pedagogy incorporating the latest teaching and learning technologies. Parallel with this initiative, the usage of Web 2.0 interactive educational tools has gained a significant recognition in Malaysia’s higher education in recent years. A new model integrating TTF model and TAM is introduced in this study. This study applied quantitative survey in the main data collection. Purposive sampling technique was used, and the data collection was conducted in a public university via Google Forms. In this study, SmartPLS is used to analyse the data. Even though the findings are partly hypothetical, it is inspiring to reveal an integrated conceptual model in exploring consumer behavioural intention related to Malaysia’s higher education context. It is hoped that the findings will suggest the legitimacy of the integrated framework and insights in Malaysian users’ continuance intention about adopting Web 2.0 educational tools.
Modelling Passenger Loyalty towards App-based Motorcycle Taxi
Authors: Suhartanto Dwi , Clemes Michael , Februadi Agustinus , Suhaeni Tintin , Christabel Loveldy Zefanya Alanza
Published: June 2020

This study evaluates the effect of both service quality and mobile application quality on passenger loyalty towards application-based motorcycle taxi (AMT) services. The data employed for this study were collected from 319 AMT service users in Bandung, Indonesia. To analyse the data, partial least squares structural equation modelling (PLS-SEM) was used to check the influence of both service quality and application quality on passenger loyalty and their indirect influence through passenger perceived value and passenger satisfaction. The result shows that the passenger perception of mobile app quality is an important driver of passenger loyalty towards AMT services. Further, this study suggests that the effect of both service quality and mobile app quality on passenger loyalty is via strengthening passenger perceived value and satisfaction. Finally, this study’s findings reveal the important role of mobile app quality as the determinant of AMT service quality. This study provides a venue for AMT business managers to improve their business performance by developing both service quality and mobile app quality.
What Makes Millennials Happy in their Workplace?
Authors: Yap Wai Meng , Zainal Badri Siti Khadijah
Published: June 2020

Happiness in the workplace remains to be an under-researched field which is unfortunate considering that the happiness-productive worker link has been strongly established. More essentially, there has been a lack of research on happiness in the workplace which considers a specific sample of millennials. In preparation for a workforce dominated with millennials, this research will help address the gap with regards to the lack of research on Malaysian millennials’ happiness in the workplace. Through a thorough literature review, six predictors or antecedents of happiness in the workplace among millennials which are meaningful work, work autonomy, transformational leadership, workplace friendship, work life balance, and gratitude have been chosen in this research. This study consists of millennials (“millennials” or Generation Y is defined in the selected literature as individuals born between years 1982 and 2004) who have undergone full time employment of at least one year or more. The results indicated that all the six predictors showed significant moderate to high positive relationships with happiness in the workplace. Multiple regression analysis showed that all six predictors significantly predicts millennials’ happiness in the workplace, besides gratitude. Implications of this study with regards to managing millennial talent in organisations are then discussed.
Multilevel Analysis on Employee Wellbeing: The Roles of Authentic Leadership, Rewards, and Meaningful Work
Authors: Mohd Salleh Eva Salmee , Dato’ Mansor Zuraina , Mohamed Zainal Siti Rohaida , Md. Yasin Ida
Published: June 2020

Employee wellbeing (EW) is becoming a genuine concern, and it has seen a resurgence in interest with the challenges in light of industrial revolution and globalisation. There is no doubt that wellbeing of the employees is one of the secret recipes that generates high return value for all levels of chains; the individual and the organisational productivity and growth as well as nation’s prosperity. However, majority of leadership researchers have failed to capture the multi-dimensional concept of EW. Moreover, the studies of the impact of leadership styles on EW are limited and narrow-focused. Thus, this study aims to examine the role of authentic leadership (AL) style on EW. This study uses meso-mediational relationship through financial and non-financial rewards and meaningful work and how they affect EW. Data were collected from 343 employees in 30 manufacturing companies in Malaysia. The finding reveals that the positivity of authentic leaders indirectly influences EW through non-financial rewards and meaningful work. It is also suggested that financial rewards and non-financial rewards should be measured separately in consideration of current socioeconomic conditions and employees’ motivational needs.
Filosofía, análisis y juegos: el inútil intento de definir las cosas
Authors: Briceño Domínguez Sebastián
Published: June 2020

Según McGinn (2012), el fin de la filosofía es descubrir esencias mediante el análisis conceptual, y ella califica como un juego en el sentido de Suits (1978, 2014). Sin embargo, todo en la definición de juego de Suits parece dejar fuera de su alcance a la definición de filosofía de McGinn. Aquí someto a revisión crítica la definición de McGinn y propongo una más comprensiva. Incidentalmente, esta definición nos permitirá incluir a la filosofía dentro de la clase de actividades que sí satisfacen la definición de juego de Suits.
La filosofía de Parménides según el testimonio de Aristóteles
Authors: Carrasco Meza Carlos
Published: June 2020

Este trabajo pretende exponer y comentar la interpretación aristotélica de la filosofía de Parménides. En primer lugar, se analiza la refutación del monismo parmenídeo en Phys. I 2-3. Luego se comenta una serie de pasajes relevantes del corpus en los que Aristóteles hace referencia tanto a la ontología y cosmología de Parménides como a su metodología de investigación filosófica. Se propone una interpretación compatibilista de la lectura aristotélica de Parménides, según la cual este último habría afirmado la unidad e inmovilidad de lo real según el concepto y su pluralidad cambiante según la sensación. Si bien es evidente la influencia platónica en ciertos aspectos de la interpretación aristotélica, esta última no es una mera recepción y repetición de la lectura de Platón. En efecto, Aristóteles parece haber comprendido el pensamiento de Parménides a partir de una distinción metodológica operativa en Phys. I 5.
Argumentación, violencia y fanatismo
Authors: Mercado Percia Heiner
Published: June 2020

El objetivo de este artículo es analizar dos procedimientos argumentativos que pueden usarse para enfrentar discusiones con personas cuyas opiniones son radicalmente opuestas y que tienden a desarrollarse en medio de fuertes alteraciones emocionales, o en las que existe la posibilidad de que uno de los interlocutores, como en el caso de una discusión con un fanático religioso o político, recurra a la violencia verbal o física. El primer procedimiento, de Philippe Breton, se basa en un protocolo que incluye tres acciones: el distanciamiento, la escucha activa y la argumentación; y el segundo, de Hubert Schleichert, plantea lo que él denomina “argumentación subversiva”.
Las mediaciones de la autoconciencia erótica. La hermenéutica butleriana del capítulo IV de la Fenomenología del espíritu
Authors: Abellón Milton
Published: June 2020

El presente artículo tiene dos objetivos específicos. El primero, es sistematizar la lectura que Butler realiza de la parte introductoria y de la sección A del capítulo IV de la Fenomenología del espíritu mediante el abordaje conjunto de Sujetos del deseo, Mecanismos psíquicos del poder y Sé mi cuerpo. El segundo, es tomar un posicionamiento crítico respecto de la hermenéutica butleriana. Las investigaciones con las que contamos hasta el momento carecen de señalamientos de este tipo. Por ello, buscamos problematizar su lectura de manera tal de poder contribuir críticamente al corpus de bibliografía complementaria sobre esta cuestión.
El pensamiento primitivo y el sentido histórico en Ortega y Eliade
Authors: Toyohira Taro
Published: June 2020

Este artículo estudia el posible diálogo, tanto personal como intelectual, sobre el pensamiento primitivo entre el filósofo español José Ortega y Gasset y el historiador rumano de las religiones Mircea Eliade. Si bien es muy conocido que ambos coincidieron en Portugal y tuvieron algunos contactos personales, su relación teórica no ha sido muy estudiada. Sin embargo, al examinar sus encuentros tanto personales como filosóficos, parece muy posible que Ortega haya tenido una decisiva influencia sobre la tesis eliadiana de la mente primitiva. Con este motivo, en primer lugar, se analizan los encuentros personales entre los dos pensadores en Portugal, anotados por Eliade en su Diario portugués. En segundo lugar, se examinan algunos aspectos importantes de la teoría sobre el pensamiento primitivo de ambos para mostrar tanto sus semejanzas como sus divergencias.
Hume contra Aristóteles, Locke y Leibniz sobre la causalidad
Authors: Mota Pinto Silvio
Published: June 2020

La concepción aristotélica de la causalidad y las que nos han heredado los filósofos de la Modernidad (en particular Locke, Leibniz y Hume) han sido ya ampliamente discutidas. Sin embargo, pienso que el contraste entre ellas todavía no ha sido resaltado lo suficiente. Este artículo se propone, pues, llenar esta laguna. Empiezo con la causalidad en Aristóteles y sus tesis de que la explicación causal requiere del conocimiento de leyes causales y de que la necesidad asociada a estas leyes presupone la existencia de poderes causales. Discuto, en seguida, los intentos de Locke y Leibniz de modernización de las tesis de Aristóteles sobre la causalidad. En un tercer momento, presento las paradojas identificadas por Hume, por un lado, entre las tesis de Locke y Leibniz sobre nuestro conocimiento de las leyes causales y, por el otro, entre la tesis aristotélica de que hay poderes causales y la práctica científica de la Modernidad. También discuto la propuesta del filósofo escocés para disolver estas paradojas. Finalizo con algunos comentarios críticos respecto del modelo humeano sobre nuestro conocimiento de las leyes causales comparado con su contribución para el análisis del concepto de “causalidad”.
¿BEL o Bypass? Dos teorías de la transparencia del autoconocimiento
Authors: Fricke Martin Francisco
Published: June 2020

Alex Byrne y Jordi Fernández proponen dos diferentes versiones de la teoría de la transparencia del autoconocimiento. Según Byrne, para autoatribuir creencias inferimos qué es lo que creemos a partir lo que tomamos como hechos sobre el mundo (siguiendo una regla que Byrne llama Bel). Según Fernández, autoatribuimos la creencia de que p con base en un estado anterior a esta creencia, un estado que fundamenta la creencia de que p (realizando un procedimiento que él llama Bypass). En este artículo expongo las dos teorías y discuto objeciones que conciernen su aspecto normativo (¿puede el procedimiento darnos conocimiento?) y metafísico (¿es funcional el procedimiento?). Concluyo que en especial las objeciones metafísicas son más graves en el caso de Bypass que en el de Bel y que las modificaciones requeridas de la teoría de Fernández la asemejan mucho a la de Byrne.
La epimeleia y la parrhesía: un estilo de existencia, un decir verdadero. Resistencia y ejercicio de la libertad en nuestra actualidad
Authors: Dionicio Lozano Milton Fernando , Delgado Rubio Edgar
Published: June 2020

Este artículo ofrece algunas reflexiones que establecen el hilo conductor que existe entre el “cuidado de sí” y el “hablar franco”. Michel Foucault ve en el “cuidado de sí” y en el “hablar franco” la condición de posibilidad de configurar otro modo de ser sujeto y, por tanto, devenir de otra manera. En consecuencia, la estilización de la existencia, esto es, el trabajo que el sujeto realiza sobre sí mismo, debe ser complementado y ampliado mediante el discurso veraz, conditio sine qua non es imposible resistir u oponerse a las tecnologías políticas que producen modos de existencia. En efecto, el propósito de las tecnologías políticas es la autorregulación de los sujetos, influir en sus deseos, esperanzas, decisiones, necesidades y estilos de vida conobjetivos gubernamentales fijados con anterioridad.
The Affective and the Political: Rousseau and Contemporary Kantianism
Authors: Davies Byron Matthew
Published: June 2020

Jean-Jacques Rousseau is often associated with a certain political mode of relating to another, where a person (“a Citizen”) is a locus of enforceable demands. I claim that Rousseau also articulated an affective mode of relating to another, where a person is seen as the locus of a kind of value (expressive of their being an independent point of view) that cannot be demanded. These are not isolated sides of a distinction, for the political mode constitutes a solution to certain problems that the affective mode encounters in common social circumstances, allowing us to see how these modes might be distinct while the political nevertheless shapes the affective. I contrast this approach with that of some contemporary Kantian writers on affective phenomena (Sarah Buss on shame, and J. David Velleman on love) who, for reasons rooted in Kant’s moral philosophy, have modeled affective ways of relating to others on duty. I claim that Rousseau’s writing provides us with a way of capturing the correct insight of these accounts—that some of our emotional responses to others are ways of appreciating their personhood—while avoiding the characteristic implausibilities of their close association between the affective and the political.
Filosofía, ¿para qué?
Authors: Alvargonzález David
Published: June 2020

En este artículo daré una respuesta razonada a la pregunta acerca de la utilidad de la filosofía. Empezaré analizando el sentido y la intencionalidad de la pregunta “filosofía, ¿para qué?”. A continuación, estudiaré los diferentes significados de la palabra “filosofía” en el contexto de esa pregunta (apartado segundo). En el epígrafe tercero, presentaré algunos ejemplos de respuestas a la pregunta “filosofía, ¿para qué?” tal como ésta se entiende en una perspectiva histórica y antropológica. A continuación, tomaré en consideración algunos sistemas filosóficos sobresalientes para ver cómo han respondido a la pregunta sobre la utilidad de la filosofía (apartado cuatro). Por último, argumentaré cuál es la respuesta a la pregunta “filosofía, ¿para qué?” desde una filosofía materialista estoica del presente (sección cinco).
Aspe Armella, V. Aristóteles y Nueva España. (2018). UASLP. 449 pp.
Authors: Pérez Manuel
Published: June 2020

Reseña del libro Virginia Aspe Armella, Aristóteles y Nueva España, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 2018.
Sánchez Muñoz, R. (2016). Introducción al personalismo de Edith Stein. Universidad Pontificia de México. 162 pp.
Authors: Casales García Roberto
Published: June 2020

El personalismo, en general, surge como una respuesta en contra del afán moderno de dar validez sólo aquello que es mesurable y empíricamente verificable, i.e., contra la tendencia positivista a olvidar la centralidad de la persona “como creadora y depositaria del sentido de la realidad” (p. 10). Cara al positivismo imperante del siglo XIX y XX, encontramos la propuesta antropológica de Edith Stein, quien asume el método fenomenológico de su maestro para articular una sólida visión de lo humano, capaz de reivindicar su dignidad constitutiva. El presente libro del profesor Rubén Sánchez, en este sentido, nos permite no sólo reparar en el recorrido intelectual que realizó la filósofa de Breslau para consolidar su antropología, sino también sumergirnos, en palabras de Gonzáles Di Pierro, en “todos los niveles de este personalismo steiniano” (p. 11). Se trata, pues, de un texto que, sin menoscabo de la hondura y complejidad del pensamiento de Stein, nos permite ahondar en su propuesta antropológica desde un lenguaje sencillo y accesible para todo público.
On the use of Maggi’s equation in the dynamic modeling of multibody systems
Authors: Horn Arthur , Malvezzi Fernando , Orsino Renato M. M.
Published: June 2020

The purpose of dynamic modeling of multibody mechanical systems is to obtain the differential equations of motion. Maggi’s equation appears as an alternative to obtain the differential equations of motion. The aim of this work is to illustrate the advantages of the use of Maggi's equation in the dynamic modeling of multibody mechanical systems. Maggi's equation is used to model the dynamics of a classical complex constrained mechanical system. An inverse dynamics simulation is performed, to illustrate how the obtained equations can be used to determine the theoretical time series of the torques required to perform a given prescribed trajectory.
Analysis of movements and degrees of freedom required for a vibration attenuation system on ambulance stretchers
Authors: Marques Luana , Malvezzi Fernando , Stavropoulos Konstantinos Dimitriou
Published: June 2020

This work deals with an analysis of the acceleration level to which a patient is exposed during ambulance transportation. A dynamic analysis of ambulance movements has been approached considering some different operating conditions of the vehicle, such as braking, driving over speed bumps and on uneven pavements. The purpose of this study is providing sources for development of a system reducing vibration effects on the body when a patient is transported by ambulance.
Effect of temperature on dynamic behavior of cracked metallic and composite beam
Authors: Hossain Mainul , Lellep Jaan
Published: June 2020

Euler-Bernoulli beam model is used to analyze the thermal vibration of cracked metallic and laminated composite beam with fully clamped ends. An analytical solution technique is proposed to investigate the natural vibration of cracked beam subjected to axial thermal load. An open and stable crack is considered perpendicular to the beam axis. In this study, three different types of material such as steel, copper and aluminum and their composition are used to analyze the thermal effect on different modes of frequency. The effects of thermal stress on the vibration of cracked metallic and composite fully clamped beam are revealed. The results show that the effect of temperature is significant on the natural frequency of cracked metallic and composite beam.
Influence of bridge geometric nonlinearity on dynamic response of vehicle-bridge coupling system
Authors: Ni Zhijun , Zhang Liangliang , Wu Tao , Zhang Binbin , Wang Teng
Published: June 2020

Based on the theory of vehicle-bridge coupling vibration, the differential equation of vehicle-bridge coupling system is set up according to different conditions. The differential equation of the system is converted into matrix form using mode decomposition method and is solved using MATLAB. The system equation has a non-linear matrix term when the geometric nonlinearity of the bridge is considered. The influence of wheel acceleration on the dynamic response of the bridge is analyzed without simplification under four speeds. The results show that it is acceptable to neglect the influence of wheel acceleration at low speeds, but it has a significant influence which must be considered at high speeds.
Non linear dynamics of a thin narrow ribbon in an airflow
Authors: Afanaseva Alexandra , Gouskov Alexander , Panovko Grigory
Published: June 2020

The nonlinear aeroelastic vibrations of the Windbelt System are described in the paper. The system works based on aeroelastic flutter principle. The long narrow ribbon with pinned supports at the ends is used as mechanical model. The analysis of aerodynamic forces for a thin rectangular cross-section of the ribbon is provided. Lateral-torsional oscillations of the system is derived, considering aerodynamic forces. Conditions for generation of oscillations are determined using Poincaré-Andronov-Hopf bifurcation. The critical speed, which defines dynamic instability (aeroelastic flutter), is determined as well. The influence of the tension force and other ribbon parameters on the critical speed is considered. The supercritical behavior of the system is investigated.
Research on curve smoothing algorithm for diesel indicator diagram
Authors: Yang Guang , Wang Tiefeng , Zhang Peng
Published: June 2020

The algorithm of curve smoothing for diesel indicator diagram is introduced, and the concrete implementation process is expounded in detail. First, the multi cyclic mean value operation of indicator diagram data is performed. By probable error of calculating indicator diagram data, if probable error is greater than a specific value, and the predicted value is used instead of the singular point data. The average operation of the indicator diagram data is processed again. Finally, the five-point cubic smoothing method is used to smooth the indicator curve, and the smooth, continuous and gradual indicator diagram curve is obtained. The experiments show that the algorithm described in the paper can effectively filter the noise of cylinder pressure signal, and obtain a smooth indicator diagram curve, which verifies the effectiveness of the algorithm described in the paper.
Kinematics analysis on pneumatic flexible finger
Authors: Liu Hongbo , Li Junye , Geng Dexu
Published: June 2020

Based on flexible pneumatic joints, a new kind of flexible finger was proposed. The structure and operating principle of the finger was presented. The kinematics equation of the finger was built by homogeneous transformation matrix. Based on the static experiment of joints, the kinematic simulation of the finger was carried out and the motion trajectory of the finger was obtained. The simulation results show that the finger has good flexibility and can complete the functions of forward bending, reverse bending and lateral swing of human hand.
Realization of electrical signal monitoring of metal surface modification by means of low-temperature plasma treatment
Authors: Brzhozovskii Boris , Zinina Elena , Martynov Vladimir , Sussky Aleksandr
Published: June 2020

The paper shows good prospects of modifying the working surfaces of metal products by low-temperature plasma treatment. We suggest a treatment monitoring method based on the recording of signals that arise in the electrical circuit of the processing unit and present the results of this approach realization. The study substantiates the expediency, assesses possibility, and shows the efficiency of controlling the low-temperature plasma modification based on the correction of its operating parameters according to monitoring data.
Numerical simulation of atomization process of nickel-based alloy powders prepared by vacuum induction melting gas atomization
Authors: Guo Kuai-Kuai , Chen Jin , Shang Shuo , Liu Chang-Sheng
Published: June 2020

ANSYS Fluent 19.0 software is used to numerically simulate atomization process in the production of nickel-based alloy powders by VIGA. The gas flow field in the atomizing chamber and atomization process of the metal melt is studied. Atomizing air flow is sprayed through the nozzle to form supersonic gas flow. The results show that the recirculation zone is inverted cone, and the length of recirculation zone is 12.28 mm. Under the stagnation point, the velocity direction of the air flow is downward, and the velocity increases gradually (the maximum is 457.43 m/s). In gas-liquid two-phase state, the length of recirculation zone is about 16 mm. The higher the turbulence in the recirculation zone and turbulent layer, the more intense the interaction between primary and secondary atomization.
Sound field separation method for motorcycle coherent sound sources
Authors: Mao Jin , Du Jinfu , Liu Kai , Cui Yahui , Liu Jiang
Published: June 2020

To solve the problem of main noise sources of motorcycles running at high speed, especially restoring the free sound field information of the target sound source in the non-free sound field, direct separation method with single holographic surface is proposed. According to the transfer function relationship between the theoretical and the measured sound pressure on the holographic surface based on the wave superposition algorithm, the individual radiation information of the target sound source in the coherent sound field is obtained. Through numerical simulation, it is found that the method could effectively separate the coherent sources. The radiation sound of motorcycles engine speed at 6000 r/min is measured, and the results show that the direct sound field separation method can effectively separate the coherent sound sources and intake noise radiate the higher pressure amplitude.
Modal finite element analysis of PCBs and the role of material anisotropy
Authors: Kalyani Uday H. , Wylie Mark
Published: June 2020

Printed Circuit Boards (PCBs) are epoxy resin-impregnated and cured sheets of counter woven glass fabric (e.g. FR4) laminated between thin sheets of Copper. The nature of the PCB is inherently anisotropic and inhomogeneous but previous modal FEMs of PCBs have assumed isotropic, anisotropic (transversely isotropic and orthotropic) material properties and shown good correlation with test data for specific scenarios [1-3]. This paper details part of a research program aimed at gaining a better understanding of accurately modeling PCB’s dynamic behavior. New investigations into the impact of material anisotropy and, in particular, the effect of material orthogonal plane definition (Ex and Ey) on eigenfrequencies is analysed. A modal FEM of a JEDEC PCB is created, verified, and validated using well established theories by Steinberg and empirical data by others [4, 5]. The relative contributions of Ex, Ey and Ez on PCB eigenfrequencies is examined using a parametric modal FEM, analysing the role of material isotropy verses anisotropy. The impact of transversely isotropic material properties is also analysed for a typical JEDEC PCB. This analysis details the mesh density required for accurately modeling the PCB eigenfrequencies. The results show that a 100 % increase in Ez has only a 0.2 % difference in the eigenfrequency where as a 100 % increase in Ey has a 1.2 % difference in the eigenfrequency. The effect of orthotropic plane definition (alternating Ex with Ey) on the JEDEC PCB amount to a 7.95 % delta in eigenfrequency.
Solving the problem of moving a solid body around a fixed point in a resisting medium
Authors: Mamatova G. U. , Hamzina B. , Kabdoldina A. О. , Sugirbekova А. K. , Berkutbaeva R. A.
Published: June 2020

In this paper, we consider the problem of motion of an axisymmetric solid around a fixed point in a resistive medium, described by nonlinear dynamic Euler equations. An analytical solution to the problem when the moments of external resistance forces are proportional to the corresponding projections of the angular velocity of the body is obtained by partial discretization of nonlinear differential equations based on the theory of generalized functions. Curves of angular velocity change are constructed and graphs of comparison of these curves with previously known exact solutions are given.
The procedure for accounting and compensation of errors of planetary gear manufacture and assembly
Authors: Nasonov Dmitry , Raevsky Vladimir , Volkhonskaya Anzhelika
Published: June 2020

The application of algorithm of solution of incorrectly specified problem is considered to correct the geometry of satellite pinions axes according to the results of indirect measurements. Based on the results of the excessive number of measurements and due to the presence of measurement errors, the probable geometry of the reduction gear box axes location and the necessary corrections are calculated using the least squares method.
Study on dynamic response of moving tank under the action of temperature field
Authors: Ma Yuze , Yang Guolai
Published: June 2020

A three-dimensional numerical model of the tank’s barrel was established using the finite element method, and dynamic process of thermal load boundary changing with projectile movement was defined. The evolution of the temperature distribution of the barrel under the firing conditions of the first projectile was obtained through numerical calculations. Furthermore, a multi-body dynamics software was used to build a shooting model for tank with a temperature field, the effects of the temperature field on the vibration of the barrel and the attitude of the projectile were studied and calculated, finally, the regular pattern of the stress of the barrel under the temperature field was analyzed. The simulation results of this model show that temperature field has a negligible effect on the barrel vibration and the projectile attitude.
Nonlinear dynamic analysis of GTF gearbox
Authors: Wang Siyu , Zhu Rupeng
Published: June 2020

Considering multiple nonlinear parameters, a nonlinear dynamic model of star gear-rotor-bearing transmission system of GTF (Geared Turbofan Engine) gearbox is established. The dynamic responses are obtained through Runge-Kutta numerical integration method, and the responses with the variation of input rotational speed are analyzed and illustrated. The abundant nonlinear characteristics are presented in the results, which could be guidance to avoid undesirable nonlinear motion, and provide a reference for the design and control of the transmission system in GTF gearbox.
Structural behavior of CFST arch foots under pumping pressure of concrete infills
Authors: Zhou Xuehong , Cheng Haiyun , Wu Gang , Zuo Junlin , Peng Shangfu
Published: June 2020

Prestressed concrete (PC) continuous girder-arch composite bridges, using concrete filled steel tubes (CFST) as the arch ribs to support the PC main girder, have gained their popularity in recently constructed large span bridges. The adoption of CFSTs brings many advantages, such as the concrete infill help to prevent the occurrence of local buckling in steel tubes, while the steel tubes can serve as framework for concrete core and strengthen the encased concrete. In order to achieve the above merits, the arch foots connecting the CFST arch ribs and PC girder are supposed to have sufficient strength and stiffness. However, the extensive use of CFST arch ribs showed that concrete cracking are commonly found at the arch foots. This paper studied the structural behavior of arch foot by employing a comprehensive numerical model. The influence of pumping pressure from concrete infill at construction stage on local stress of the arch foots was presented and discussed. The results indicated that the radial stress produced by pumping pressure at the joint zone squeezed the concrete around the arch foots, which resulted in significant hoop tensile stresses in the surrounding concrete. The outcomes of this study can provide technical support to improve the construction quality and structure stability, and optimize the construction procedures for this type of bridges.
Experience and perspectives of using active noise and vibration control for reduction of low frequency noise and vibration in gas guide systems of power plants
Authors: Vasilyev Andrey V.
Published: June 2020

One of the main reasons of generation of intensive noise and vibration in low frequency range are gas pressure pulsations (oscillations) in gas guide systems of power plants. Active noise and vibration control now is considered as efficient method of low frequency noise and vibration for different applications, including reduction of low frequency noise and vibration in gas guide systems of power plants. Results of analysis of application of active noise and vibration control systems for the reduction of power plants low frequency noise and vibration are described. The examples are showing high possibilities and efficiency of active noise and vibration control method. In a meantime, existing constructions of ANVC systems are having some drawbacks. Author’s experience of development of constructions and technical solutions of ANVC systems for reduction of low frequency noise and vibration in power plants gas guide systems is presented. Further perspectives of increasing of efficiency of ANVC control of low frequency noise and vibration reduction generated by power plants are discussed.
Vibration analyses of linear isolators incorporating a quasi-zero stiffness and an inerter simultaneously
Authors: Wang Xuan , Zhang Jiafan , Ouyang Huajiang , Zheng Xiao , Ye Jianping
Published: June 2020

Three configurations that incorporate a negative stiffness element and an inerter in parallel connection into the conventional isolator are considered to investigate their vibration characteristics from the point of view of resonance frequencies and displacement transmissibility. Analytical and numerical results are evaluated and compared with each other. It is illustrated that for the configuration of the inerter and an additional viscous damper in series connection which are then connected with the negative stiffness element in parallel, the isolator shows a better vibration isolation performance.
Slow oscillations in systems with inertial vibration exciters
Authors: Yaroshevich Nikolay , Puts Vitalii , Yaroshevich Тetjana , Herasymchuk Oleksandr
Published: June 2020

The problem of the occurrence of semi-slow speed oscillations of an unbalanced rotor during its passage through the resonance zone has been solved using the method of direct separation of motions. It has been proved that when a stationary regime is established, semi-slow damping oscillations of the rotor speed arise in the region of the Sommerfeld effect, they are the result of the superimposement of free accompanying oscillations with a relatively low frequency on forced fast oscillations. In this respect, the initial amplitudes of such oscillations are quite large, and oscillations damping is relatively slow.
Research on patch near-field acoustic holography based on two-level iteration
Authors: Gu Gaoquan , Zhang Jing
Published: June 2020

In order to solve the “window effect” and “aperture repetition effect” caused by limited measurement aperture, a patch near-field acoustic holography method based on two-level iteration is proposed. After analyzing the principle and process of patch near-field acoustical holography based on orthogonal spherical wave, a patch near-field acoustical holography method based on two-level iteration is proposed. The validity of the method is verified by simulation and experiment. Compared with the reconstruction results of patch near-field acoustical holography based on orthogonal spherical wave, it shows the superiority of patch near-field acoustical holography based on two-level iteration.
Engineering model of the vibrational transportation process
Authors: Blekhman Iliya , Blekhman Leonid , Vasilkov Vladislav
Published: June 2020

A vibrational transportation model is proposed for single-piece and granular materials. In contrast to the well-known (“basic”) model, it allows obtaining simple general formulas for estimating the velocity of vibrational transportation in intensive tossing regimes. Such regimes are characteristic of a large number of existing and promising vibrational transportation-based process machines. This approach eliminates the need to design separate complex formulas for each of the many regimes predicted by the basic model. It has been shown that the resulting formulas are in good agreement with the experimental data, including those obtained in the work. In connection with the study, the topic of rational modeling of similar dynamic systems with complex behavior is discussed.
Bearing fault identification based on ASMOTE-CFR
Authors: Cheng Huanke , Wang Ping , Wang Guangbin , Lv Ying
Published: June 2020

Aiming at the problem of data unbalance caused by the lack of bearing failure test data, the paper proposes a collaborative filtering recommendation (CFR) method for adaptive Smote (ASMOTE) resampling and matrix decomposition of minority samples (ASMOTE-CFR). The method first adopts adaptive Smote method to synthesize different number of new sample equalization test data sets according to the data distribution. and then a variety of typical feature values such as time domain, frequency domain, time frequency domain, etc. are extracted to obtain the bearing feature matrix, and then a scoring matrix that accurately describes the bearing state is designed and based on the matrix Based on the decomposed collaborative filtering algorithm, a set of collaborative filtering recommendation system for bearing state recognition is proposed. Using this method, different forms of fault data on the outer ring of the rolling bearing were identified and verified. The accuracy of identification reached more than 98 %. Compared with the recognition accuracy of the collaborative filtering recommendation algorithm, this method improved 8 %.
Particle migration in shale oil development
Authors: Shan Jie , Zhou Xiaojun
Published: June 2020

The extraction of shale oil is a hot issue in today’s society where resources are tight. However, the pores of shale oil are complex. The migration of particles in the pores may lead to blockage of narrow oil passages and may also unclog the oil passages. Therefore, this paper studies the particle migration during shale oil development, and uses simulation to find out the particle migration law in laboratory experiments.