scholarly journals Effect of Clearance and Friction in Revolute Imperfect Joints on Dynamic Behaviors of a Slider-Crank Mechanism with Two Sliders

2018 ◽  
Vol 2 (1) ◽  
pp. 1 ◽  
Author(s):  
Thanh-Phong Dao ◽  
Ngoc-Thai Huynh ◽  
Tuan-Hai Nguyen ◽  
Hoang-Nghien Vu ◽  
Le-Quang-Nhat Hoang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Contact Force ◽  
Original Work ◽  
Dynamic Behaviors ◽  
Creative Commons ◽  
Maximum Value ◽  
Scientists And Engineers ◽  
Unstable Oscillation ◽  
Crank Mechanism ◽  
Open Access Article

Friction and clearance always present in any mechanical system. Hence, the effects of friction and clearance on a dynamic system are so critical. This paper aims to investigate their effects on the dynamic response of a slider-crank mechanism with two sliders and imperfect joints. Firstly, the mechanism is created in Solidworks and then it is simulated via finite element method in ANSYS. The dynamic simulation are conducted to evaluate the mentioned effects. The results revealed that the effect degree of clearance on the dynamic behaviors of the proposed mechanisms is significantly higher than that of friction. Also, the results indicated that the velocities, acceleration, and contact force graph are almost same at different friction coefficient. However, compared with ideal joint case, they had a maximum value and an unstable oscillation. This problem is due to journal collide into bearing induced the maximum values of contact force. The results of this study are a helpful guidance to practitioners, scientists, and engineers.  This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals Dynamic Fault Classification and Location in Distribution Networks

2018 ◽  
Vol 2 (3) ◽  
pp. 188
Author(s):  
Abdelhakim Bouricha ◽  
Tahar Bouthiba ◽  
Samira Seghir ◽  
Rebiha Boukhari
Keyword(s):  
Open Access ◽  
Comparative Study ◽  
Original Work ◽  
Distribution Networks ◽  
Fault Classification ◽  
Creative Commons ◽  
Maximum Value ◽  
Two Samples ◽  
Signal Simulation ◽  
Open Access Article

This paper presents a method for detecting, classifying and localizing faults in MV distribution networks. This method is based on only two samples of current or voltage signals. The fault detection, faultclassification and fault localization are based on the maximum value of current and voltage as a function of time. A study is presented in this work to evaluate the proposed method.A comparative study between current and voltage method detection has been done to determine which is the fastest. In addition, the classication and localization of faults were made by the same method using two samples signal. Simulation with results have been obtained by using MATLAB / Simulink software. Results are reported and conclusions are drown.  This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals Research on the Correlation of Serum PCT and Plasma GSN Levels with the Prognosis of Urosepsis Patients

2020 ◽  
Vol 36 (5) ◽  
Author(s):  
Na Cui ◽  
Zhanbiao Yu ◽  
Zhi Chen ◽  
Ning Chen
Keyword(s):  
Poor Prognosis ◽  
Original Work ◽  
Protective Factor ◽  
Good Prognosis ◽  
Control Group ◽  
Creative Commons ◽  
The Poor ◽  
Prognosis Group ◽  
Good Prognosis Group ◽  
Open Access Article

Objective: To explore the correlation of procalcitonin (PCT) and gelsolin (GSN) with the prognosis of urosepsis patients. Method: The data of 71 urosepsis patients from March 2015 to April 2019 who were admitted to and treated in Affiliated Hospital of Hebei University were analyzed and compared with those of 92 healthy persons. Serum PCT and plasma GSN levels at different times after treatment were detected. According to prognosis, patients were classified into the good prognosis group or the poor prognosis group. The serum PCT and plasma GSN levels of both groups were compared. Result: The serum PCT level of the urosepsis group on the 1st, 3rd, 5th and 7th days was obviously higher than that of the control group (P<0.05). The plasma GSN levels of the urosepsis group on the 1st, 3rd, 5th and 7th days were obviously lower than those of the control group (P<0.05).The serum PCT level of the poor prognosis group on the 1st, 3rd, 5th and 7th days was obviously higher than that of the good prognosis group (P<0.05). The plasma GSN level of the poor prognosis group on the 1st, 3rd, 5th and 7th days was obviously lower than that of the good prognosis group (P<0.05). PCT was an independent risk factor influencing the prognosis of urosepsis patients and that GSN was a protective factor (P<0.05). Conclusion: The serum PCT and plasma GSN levels can accurately predict the severity and prognosis of urosepsis patients and reflect the disease state of early urosepsis patients. High PCT levels and low GSN levels indicate poor prognosis, and clinicians should consider these values. doi: https://doi.org/10.12669/pjms.36.5.2143 How to cite this:Cui N, Yu Z, Chen Z, Chen N. Research on the Correlation of Serum PCT and Plasma GSN Levels with the Prognosis of Urosepsis Patients. Pak J Med Sci. 2020;36(5):---------. doi: https://doi.org/10.12669/pjms.36.5.2143 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals Promoting Research Culture at Indus Health Network

2019 ◽  
Vol 36 (ICON-Suppl) ◽  
Author(s):  
Shaukat Ali Jawaid
Keyword(s):  
Open Access ◽  
Original Work ◽  
Research Culture ◽  
Health Network ◽  
Creative Commons ◽  
Special Supplement ◽  
Open Access Article

doi: https://doi.org/10.12669/pjms.36.ICON-Suppl.1861 How to cite this:Jawaid SA. Promoting Research Culture at Indus Health Network. Pak J Med Sci. Special Supplement ICON 2020. 2020;36(1):S2. doi: https://doi.org/10.12669/pjms.36.ICON-Suppl.1861 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals A Framework for Protecting Pregnant Women in the Era of COVID-19 Pandemic

2021 ◽  
Vol 10 (1) ◽  
pp. 109-112
Author(s):  
Deepa Dongarwar ◽  
Veronica Ajewole ◽  
Kiydra Harris ◽  
Emmanuella Oduguwa ◽  
Theresa Ofili ◽  
...  
Keyword(s):  
Open Access ◽  
Severe Acute Respiratory Syndrome ◽  
Best Practices ◽  
Global Health ◽  
Pregnant Women ◽  
Original Work ◽  
Creative Commons ◽  
New Challenges ◽  
Work First ◽  
Open Access Article

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent for the coronavirus disease 2019 (COVID-19) pandemic, highlighted and compounded problems while posing new challenges for the pregnant population. Although individual organizations have provided disparate information, guidance, and updates on managing the pregnant population during the current COVID-19 pandemic, it is important to develop a collective model that highlights all the best practices needed to protect the pregnant population during the pandemic. To establish a standard for ensuring safety during the pandemic, we present a framework that describes best practices for the management of the pregnant population during the ongoing COVID-19pandemic.   Copyright © 2021 Dongarwar, et al. Published by Global Health and Education Projects, Inc. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in this journal, is properly cited.

scholarly journals Problems faced by Researchers and pressure on Impact Factor Journal Editors

2021 ◽  
Vol 37 (3) ◽  
Author(s):  
Shaukat Ali Jawaid
Keyword(s):  
Open Access ◽  
Impact Factor ◽  
Original Work ◽  
Impact Factor Journal ◽  
Creative Commons ◽  
Journal Editors ◽  
Open Access Article

doi: https://doi.org/10.12669/pjms.37.3.4296 How to cite this:Jawaid SA. Problems faced by Researchers and pressure on Impact Factor Journal Editors. Pak J Med Sci. 2021;37(3):616-620.  doi: https://doi.org/10.12669/pjms.37.3.4296 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals Spontaneous Detorsion of Sigmoid Volvulus in a patient with Nineteen-Volvulus episode history: A rare outcome of an extremely rare clinical entity

2021 ◽  
Vol 37 (7) ◽  
Author(s):  
Sabri Selcuk Atamanalp ◽  
Esra Disci ◽  
Cansu Tatar Atamanalp ◽  
Refik Selim Atamanalp
Keyword(s):  
Open Access ◽  
Original Work ◽  
Sigmoid Volvulus ◽  
Clinical Entity ◽  
Rare Clinical Entity ◽  
Creative Commons ◽  
Multiple Episode ◽  
Open Access Article

Sigmoid volvulus (SV) recurrence more than 10 times is an extremely rare clinical entity and spontaneous detorsion is a rare outcome of SV. In this paper, we report a case with 19 previous SV attacks, in last of which spontaneous detorsion occurred. Such a multiple-episode history as well as an unexpected recovery was unique in a 1,036-case clinical profession of Ataturk University with SV over a 54.5-year period. doi: https://doi.org/10.12669/pjms.37.7.4703 How to cite this:Atamanalp SS, Disci E, Tatar Atamanalp C, Atamanalp RS. Spontaneous Detorsion of Sigmoid Volvulus in a patient with Nineteen-Volvulus episode history: A rare outcome of an extremely rare clinical entity. Pak J Med Sci. 2021;37(7):---------.  doi: https://doi.org/10.12669/pjms.37.7.4703 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals 2019 Health Equity Summer Research Summit Organized by the Center of Excellence in Health Equity, Training and Research, Baylor College of Medicine, Houston, Texas 77030, USA on June 18th, 2019

2020 ◽  
Vol 9 (2s) ◽  
pp. S1-S46
Author(s):  
A Uribe-Gomez ◽  
Abraham A. Salinas-Miranda ◽  
Acara E. Turner ◽  
Adriana M. Strutt ◽  
Adrienne Joseph ◽  
...  
Keyword(s):  
Open Access ◽  
Health Equity ◽  
Original Work ◽  
Baylor College ◽  
Creative Commons ◽  
Center Of Excellence ◽  
Training And Research ◽  
Open Access Article

Copyright © 2020 Harris. This is an open-access article distributed under the terms of the Creative Commons At - tribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals Exploration of constructs of professionalism identified in the ABIM framework as perceived by the faculty fitting the Pakistani context

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Humaira Fayyaz Khan ◽  
Raheela Yasmeen
Keyword(s):  
Open Access ◽  
Focus Group ◽  
Original Work ◽  
Group Discussion ◽  
Local Context ◽  
Ethnographic Research ◽  
Professional Conduct ◽  
Medical College ◽  
Creative Commons ◽  
Open Access Article

Objective: Domains of professionalism are well-described in the literature. Examining the elements of Professionalism in the local context have received less attention from education experts. The aim of the study was to explore the construct of professionalism as perceived by the faculty that fitted the Pakistani context identified in the ABIM framework of professionalism. Methods: This qualitative ethnographic research was conducted involving nine participants from Islamic International Medical College in Riphah University Islamabad. A four hours Focus Group Discussion was undertaken to explore the views of the faculty. The focus group session was audiotaped, transcribed and technique of triangulation was employed. Shortened meaningful unit (SMU) were identified from the transcribed data and analyzed to make codes for themes for the behaviors. Forty-six meaningful units were categorized and codes were identified. The themes were identified under the domains of the ABIM frameworks for the Pakistani context. Results: The participants listed 2-8 elements for each domain of the framework describing the professional conduct which lead to 140 shortened meaningful units. These were organized into 46 higher order codes. Conclusions: The study concludes that that ABIM framework can be used to build consensus regarding the domains of professionalism. No difference was found cross contextually regarding the domains of ABIM framework of professionalism. doi: https://doi.org/10.12669/pjms.36.3.1573 How to cite this:Khan HF, Yasmeen R. Exploration of constructs of professionalism identified in the ABIM framework as perceived by the faculty fitting the Pakistani context. Pak J Med Sci. 2020;36(3):---------. doi: https://doi.org/10.12669/pjms.36.3.1573 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals The “new-normal” OSCE examination: Executing in the COVID-19 era

2021 ◽  
Vol 37 (7) ◽  
Author(s):  
Shazia Babar Matin ◽  
Azam Saeed Afzal
Keyword(s):  
Health Professionals ◽  
Original Work ◽  
Clinical Skills ◽  
Educational Institutions ◽  
New Normal ◽  
Face To Face ◽  
Creative Commons ◽  
Shared Experiences ◽  
Special Challenge ◽  
Open Access Article

In this unprecedented situation of COVID-19 era, the educational institutions have to attune not only the teaching strategies but also the assessment. Similarly, just as COVID precautions have become the “new normal” practice, hence implementation changes during face-to-face examinations may become standard practice in the Post- COVID era. The Objective structured clinical exams (OSCEs) which usually require a face-to-face assessment of skills, posed a special challenge to health professionals in COVID-19. This commentary paper is written on shared experiences of the examination cell principal resource faculty for OSCE and exam coordinators. It addresses how to plan and implement objective, valid, feasible and reliable clinical skills examinations (OSCEs) keeping in place COVID precautions to ensure the utmost wellbeing of all stakeholders involved. doi: https://doi.org/10.12669/pjms.37.7.4568 How to cite this:Babar S, Afzal A. The “new-normal” OSCE examination: Executing in the COVID-19 era. Pak J Med Sci. 2021;37(7):---------.  doi: https://doi.org/10.12669/pjms.37.7.4568 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

scholarly journals ANALYSIS OF RIGID AND FLEXIBLE DYNAMICS OF A SPACE-SLIDER-CRANK MECHANISM BASED ON FINITE ELEMENT METHOD

2021 ◽  
Vol 50 (02) ◽  
Author(s):  
NGOC THAI HUYNH ◽  
CONG RO HOANG ◽  
TRUNG KIEN TRAN ◽  
VAN HOAI LE
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Contact Force ◽  
Maximum Principal Stress ◽  
Contact Forces ◽  
Element Analysis ◽  
Ball Impact ◽  
Contact And Impact ◽  
Crank Mechanism ◽  
Element Method

The investigation analyzes effects of clearance size in revolute and spherical joints with clearance on rigid-flexible dynamic of a space slider crank mechanism by finite element method. The model of the mechanism was designed by Solidworks and then velocity, acceleration, displacement, stress and contact force were determined by finite element analysis of rigid-transient dynamic in ANSYS. The results simulation indicated that the clearance size in revolute and spherical with clearance has sightly effected on the velocity of the slider, but has significantly effected on acceleration, contact force as journal and ball impact into bearing and socket with high peaks of acceleration and contact force as presented in the graph of acceleration and contact forces. The graph outlined that journal and ball motion with three types: free light, contact and impact motion. Clearance size created deviation for the displacement of the slider from 4.29 mm to 9.87 mm and maximum principal stress increases from 8.4 MPa to 10 MPa when clearance size increases from 0 mm to 0.3 mm.

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