scholarly journals Entropy Analysis for Cilia-Generated Motion of Cu-Blood Flow of Nanofluid in an Annulus

Symmetry ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2358
Author(s):  
Arshad Riaz ◽  
Elena Bobescu ◽  
Katta Ramesh ◽  
Rahmat Ellahi
Keyword(s):  
Blood Flow ◽  
Fluid Transport ◽  
Medical Science ◽  
Gradient Distribution ◽  
Factors Affecting ◽  
Long Wavelength ◽  
Thermal Transfer ◽  
Entropy Effects ◽  
Novel Model ◽  
Physical Quantities

In this study, a novel model of entropy generation effects measured in the Cu-blood flow of a nanofluid under the effect of ciliary-oriented motion is proposed. The effects of viscous dissipation are also taken into account. The physical model was composed with the incorporation of a low Reynolds number and long-wavelength phenomena. The exact solutions for the axial velocity, temperature and pressure gradient distribution were achieved successfully. Key findings are presented through a strategy of plotting the significant factors affecting the physical quantities of the stream. It was found that the heat absorption parameter and Brownian motion accounted for the large thermal transfer rate, while the effect of entropy was minimal compared to these factors in the center of the flow but increased on the walls in the case of Cu-blood flow. It can also be added that a more intense flow gave rise to the entropy effects. This study may be helpful in medical science as cilia play vital roles, which include cell migration and external fluid transport, in human tissues and some key organs. Moreover, the considered annulus-shaped geometry gives vital readings that are used in medical equipment such as endoscopes.

Factors affecting regional pulmonary blood flow in left heart valvular disease

1974 ◽  
Vol 57 (3) ◽  
pp. 421-436 ◽  
Author(s):  
Carlo Giuntini ◽  
Mario Mariani ◽  
Antonio Barsotti ◽  
Ferruccio Fazio ◽  
Annamaria Santolicandro
Keyword(s):  
Blood Flow ◽  
Pulmonary Blood Flow ◽  
Valvular Disease ◽  
Left Heart ◽  
Factors Affecting

Some factors affecting tissue Po2 in the carotid body

1975 ◽  
Vol 39 (4) ◽  
pp. 562-566 ◽  
Author(s):  
W. J. Whalen ◽  
P. Nair
Keyword(s):  
Blood Flow ◽  
Arterial Pressure ◽  
Carotid Body ◽  
Discharge Rate ◽  
Reduced Pressure ◽  
Factors Affecting ◽  
Arterial Blood ◽  
Nervous System Activity ◽  
Tissue Po2 ◽  
Anesthetized Cat

In the carotid body (CB) of the anesthetized cat tissue Po2 (Pto2) measured with a micro O2 electrode averaged about 65 mmHg at normal arterial pressure (mean = 96 mmHg). Pto2 correlated significantly with the hematocrit of the arterial blood but not with % saturation. When arterial pressure was reduced (mean = 58 mmHg) by bleeding Pto2 fell significantly. Phentolamine injection (1 mg/kg iv) at the reduced pressure caused Pto2 to rise significantly. At normal arterial pressure blowing moistened O2 over the CB did not affect Pto2 if the electrode tip was about 90 mum into the CB. At a reduced pressure (and blood flow) the sensitive depth increased to about 301 mum, and to about 600 mum when flow was stopped. We concluded that a) the increased chemoceptor discharge usually seen with hemorrhage is due to reduced Pto2; b) the reduction in Pto2 is probably due to reduced blood flow which is, in turn, caused partly, at least, by sympathetic nervous system activity; c) O2 content, rather than Po2, may determine chemoreceptor discharge rate; and d) there are no barriers in the CB which are impermeable to O2.

scholarly journals THE STUDY OF THE EFFECT OF ETHICAL CLIMATE ON THE UNIVERSITY STUDENTS’ EDUCATIONAL ATTITUDES IN OPERATING ROOM

2016 ◽  
pp. 105
Author(s):  
Nazanin Yousefian Miandoab ◽  
Mahnaz Shahrakipour ◽  
Sadegh Zare
Keyword(s):  
University Students ◽  
Operating Room ◽  
Ethical Climate ◽  
Statistical Tests ◽  
Medical Science ◽  
Average Score ◽  
Educational Attitudes ◽  
Factors Affecting ◽  
Objective Health ◽  
The University

<p>ABSTRACT<br />Objective: Health-care students should be properly trained to be able to solve the society problems in the future. One of the factors affecting the<br />academic progress of students is student’s educational attitudes that are affected by the factors such as their learning environment’s climate. The<br />aim of the current study is studying the ethical climate on the university students’ educational attitudes in the operating room of the medical science<br />university in Zahedan.<br />Methods: In this descriptive-analytical study, the students were selected by census method (62 students). To collect the data, a three-part questionnaire<br />was used that the first part was related to the demographic features, the second part was related to the educational attitude, and the third part was<br />related to Olson’s standard questionnaire. The data were analyzed in SPSS 19 by statistical tests, t-test, and variance analysis.<br />Results: The average age of students was 21.65±1.63 and 36 participants were female and 26 participants were male. 34 participants were educating<br />in semester 4 and 28 participants were educating semester 8. The average score of educational attitude was 87.01±9.20 and the average score of<br />ethical climate was 15.58±92.85, and the significant relationships were observed between the ethical climate and educational attitude (p=0.03).<br />Conclusion: The results of this study showed that students have a positive view of their field of study and existence ethical climate and managers, and<br />officials should try to maintain this situation, and the relationship between the ethical climate and educational attitude was significant.<br />Keywords: Educational attitude, Ethical climate, The university students, Operating rooms.</p>

scholarly journals Factors Affecting Nurses’ Perceived Organizational Commitment: A Qualitative Study

2019 ◽  
Vol 18 (2) ◽  
pp. 303-311 ◽  
Author(s):  
Faribah Sepahvand ◽  
Foorozan Atashzadeh Shoorideh ◽  
Soroor Parvizy ◽  
Mansoureh Zagheri Tafreshi
Keyword(s):  
Content Analysis ◽  
Organizational Commitment ◽  
Qualitative Study ◽  
Nurse Managers ◽  
Qualitative Content Analysis ◽  
Medical Science ◽  
Organizational Factors ◽  
Structured Interviews ◽  
Factors Affecting ◽  
Clinical Nurses

Objective: Nurses’ organizational commitment is one of the most important factors that facilitates their professional evolution and influences the method of care provision, quality of care, and patients’ satisfaction. The aim of this study was identified the factors that affect nurses’ perceived organizational commitment. Material and Methods: This qualitative study, conducted on 16 clinical nurses employed in Social Security Hospital of Khorramabad, Iran, during five months from May to September 2015, used deep semi-structured interviews. Purposive sampling method was used for the selection of nurses and the data were analyzed using conventional qualitative content analysis. Lincoln & Guba’s criteria were used to secure data accuracy and stability. Results: Sixteen subcategories, five categories, and three themes were distilled during content analysis process. The abstracted themes included “organizational factors”, “occupational challenges”, and “contributory management”. Conclusion: Our findings showed that numerous factors present in nurses’ profession and work environment may influence the rate of nurses’ interest and commitment in the hospital and the related organization. Hence, nurse managers can foster the promotion of nurses’ organizational commitment through creating the required suitable conditions. Bangladesh Journal of Medical Science Vol.18(2) 2019 p.303-311

The Effects of Phorbol Esters on Fluid Transport and Blood Flow in the Small Intestine

1986 ◽  
Vol 182 (3) ◽  
pp. 404-408 ◽  
Author(s):  
A. Sjoqvist ◽  
L. S. Henderson ◽  
J. D. Fondacaro
Keyword(s):  
Blood Flow ◽  
Small Intestine ◽  
Fluid Transport ◽  
Phorbol Esters

Factors affecting regional pulmonary blood flow in chronic ischemic heart disease

1988 ◽  
Vol 3 (3) ◽  
pp. 65-72 ◽  
Author(s):  
Massimo Pistolesi ◽  
Massimo Miniati ◽  
Marisa Bonsignore ◽  
Felicita Andreotti ◽  
Giorgio Di Ricco ◽  
...  
Keyword(s):  
Blood Flow ◽  
Heart Disease ◽  
Ischemic Heart Disease ◽  
Pulmonary Blood Flow ◽  
Ischemic Heart ◽  
Chronic Ischemic Heart Disease ◽  
Factors Affecting

Two-parameter Lie convective Casson fluid scale study with MHD, joule heating and viscous dissipation influences

2020 ◽  
pp. 095440622096484
Author(s):  
Muhammad Nazim Tufail ◽  
Musharafa Saleem ◽  
Qasim Ali Chaudhry
Keyword(s):  
Differential Equations ◽  
Viscous Dissipation ◽  
Joule Heating ◽  
Casson Fluid ◽  
Graphical Analysis ◽  
Thermal Transfer ◽  
Fluid Parameter ◽  
Two Parameters ◽  
Unsteady Effects ◽  
Physical Quantities

The model encountered an unsteady laminar and two-dimensional convective flow of Casson fluid passing through an inclined permeable vertical stretching sheet. The momentum, thermal and concentrated boundary layers (BLs) are used to analyze the unsteady effects of magnetohydrodynamics (MHD) (neglecting induced magnetic field), viscous dissipation, Joule heating and chemical reactions. The governed partial differential equations (PDEs) of the model are reduced to the ordinary differential equations (ODEs). The ξ and χ are selected as the two parameters of the scaling transformations. By using bvp4c with MATLAB, the ODEs are solved numerically and represent their results through the graphs and tables. After the non-dimensionalizing of the equations system, we get the emerging dimensionless parameters. The concentration process was enhanced by the Casson fluid parameter but it reduced the fluid flow and thermal transfer that can be found through the graphical results. The effect of Buoyancy is highlighted as it reduced the velocity profile function, but it is a growing function of the thermal and concentrated profiles. The physical quantities are integrated through the table and graphical analysis. In the center of the wall, the number Shx versus Sc decreases, but at the end it increases.

Physiological factors affecting secretion of parotid hormone

1987 ◽  
Vol 252 (4) ◽  
pp. E477-E484 ◽  
Author(s):  
J. Leonora ◽  
J. M. Tieche ◽  
J. Celestin
Keyword(s):  
Parotid Gland ◽  
Fluid Transport ◽  
Fold Increase ◽  
Physiological Process ◽  
Tissue Extract ◽  
Control Mechanisms ◽  
Physiological Factors ◽  
Factors Affecting ◽  
Oral Microbes ◽  
Endocrine Axis

A parotid hormone (PH) that stimulates a dentinal fluid transport (DFT) mechanism in rat teeth is part of the hypothalamic parotid gland endocrine axis (HPEA). Infusion of a porcine hypothalamus-thalamic tissue extract (PHTE) into anesthetized rats stimulates the DFT mechanism in intact animals but is ineffective in parotidectomized rats. Infusion of PHTE into intact conscious pigs raises the plasma titer of immunoreactive PH (iPH) five- to eightfold. Parotidectomy prevents the response. The feeding of pig chow is a potent stimulus for iPH secretion: an 11-fold increase is reached within 10-20 min, and the response is directly related to the length of the feeding stimulus. No response is obtained after parotidectomy. The secretion of saliva and iPH from the parotids occurs independently of each other, suggesting different control mechanisms for each function. The immediate secretion of iPH in response to feeding and its relationship to DFT stimulation may represent a systemic physiological process by which resistance of teeth to decay is enhanced at a time when the acidogenic potential of the oral microbes is maximum.

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