scholarly journals Theoretical and Experimental Research on Multi-Layer Vessel-like Structure Printing Based on 3D Bio-Printing Technology

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1517
Author(s):  
Huanbao Liu ◽  
Xianhai Yang ◽  
Xiang Cheng ◽  
Guangxi Zhao ◽  
Guangming Zheng ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Blood Vessel ◽  
Experimental Research ◽  
Autologous Transplantation ◽  
Vascular Diseases ◽  
Movement Speed ◽  
Printing Technology ◽  
Industrial Manufacturing ◽  
The Relationship ◽  
Single Material

Cardiovascular disease is the leading cause of death worldwide. Traditional autologous transplantation has become a severe issue due to insufficient donors. Artificial blood vessel is an effective method for the treatment of major vascular diseases, such as heart and peripheral blood vessel diseases. However, the traditional single-material printing technology has been unable to meet the users’ demand for product functional complexity, which is not only reflected in the field of industrial manufacturing, but also in the field of functional vessel-like structure regeneration. In order to achieve the printing and forming of multi-layer vessel-like structures, this paper carries out theoretical and experimental research on the printing and forming of a multi-layer vessel-like structure based on multi-material 3D bioprinting technology. Firstly, theoretical analysis has been explored to research the relationship among the different parameters in the process of vessel forming, and further confirm the synchronous relationship among the extrusion rate of material, the tangential speed of the rotating rod, and the movement speed of the platform. Secondly, sodium alginate and gelatin have been used as the experimental materials to manufacture the vessel-like structure, and the corrected parameter of the theoretical analysis is further verified. Finally, the cell-loaded materials have been printed and analyzed, and cell viability is more than 90%, which provides support for the research of multi-layer vessel-like structure printing.

Microprocessor Architecture Era for Development Cloud Computing of Ministry of Electricity and Energy of Egypt

2014 ◽  
Vol 13 (12) ◽  
pp. 5199-5209
Author(s):  
Heba A. El-Khobby ◽  
Mostafa M. AbdElnaby ◽  
Abdel-Aziz Ibrahim Mahmoud HASSANIN ◽  
Abdallah D. Maziad
Keyword(s):  
Information Technology ◽  
Cloud Computing ◽  
Theoretical Analysis ◽  
Organization Structure ◽  
Fixed Time ◽  
Organization Structures ◽  
Competence Evaluation ◽  
Competency Based ◽  
Services Evaluation ◽  
The Relationship

A development and evaluation the Cloud Computing (ClComp) of Ministry of Electricity and Energy of Egypt (MEEE) is presented in this paper. In order to be able to judge whether the ClComp of MEEE is competence, there is a need to develop criteria which performance can judged. Competency based standards and the ability to perform the activities within an occupation to the standard expected in the organization structure are presented. The key objective of Cloud Computing is to integrate Authorized Groups (AuthGs) development with the needs of the organization structures of MEEE. The ClComp of MEEE was developed jointly between the telecommunication information technology and ClComp services. Evaluation enables participant to distinguish between AuthGs centered view and a customer centered view of cloud computing of MEEE is competence evaluation. Recognize the main types of evaluation, explain the purpose of evaluation compare the approaches to cloud computing evaluation and review the relationship between the process and policy of evaluation are investigated. Microprocessor architecture presented an optimistic view of multicore scalability to develop the ClComp. Moreover this paper investigates the theoretical analysis of multiprocessor developing and scalability. The analysis was based on the laws of Amdahl's, Gustafson's, Hill's and Marty for fixed-workload condition. Moreover, challenged the difficulties to develop better cloud computing is taken into account. Also, multicore analysis of ClComp scalability, performance and power under fixed-time and memory-bound conditions are studied. These results complement existing studies and demonstrate that ClComp architectures are capable of extensive scalability and developing.

Impact of Physical Activity on the Incidence of Vascular Diseases in Adults with Type 2 Diabetes Mellitus

2019 ◽  
Vol 8 ◽  
pp. 1549
Author(s):  
Babak Pezeshki ◽  
Ehsan Bahramali ◽  
Amir Ansari ◽  
Aliasghar Karimi ◽  
Mojtaba Frajam ◽  
...  
Keyword(s):  
Physical Activity ◽  
Diabetes Mellitus ◽  
Vascular Function ◽  
Vascular Diseases ◽  
Major Complication ◽  
Control Group ◽  
Case Group ◽  
Vascular Events ◽  
The Relationship

Background: Diabetes mellitus (DM) is a common metabolic disease worldwide and has many complications. The vascular events are the major complication of DM that have an important effect on mortality and disability. The physical activity (PA) enhances the vascular function by several pathways. The aim of this study was to evaluation of the relationship between PA and vascular diseases in patients with DM.Materials and Methods: This research was performed as the case-control study that was extracted from a prospective epidemiological research study in Iran (PERSIAN). The patients with type 2 DM more than six months defined as case group and the non-DM subjects in control group with ratio 1:2, and both groups were matched in the term of age and sex. The MET score was used to evaluate the level of PA and blood glucose, lipid profile, body mass index, overweight, dyslipidemia, glomerular filtration rate, myocardial infarction (MI), unstable angina, and stroke.Results: Overall, 1242 patients with DM were extracted, and 2484 non-diabetic subjects were investigated. In the case group, 355(28.6 %) and 887(71.4%) were men and women, respectively, the and 710 (28.6%) men and 1774(71.4%) women in control group. The mean MET score was 30 and 40.97 in the DM and non-DM groups, respectively (P˂0.001). The frequency of MI, stroke, and cardiac ischemia were 44 (3.5%), 37 (3%), and 267 (21.5%), respectively in DM group, and 54 (2.2%), 43 (1.7%), and 389 (15.7%), respectively in non-DM group.Conclusion: The incidence of vascular events associated with PA level in patients with DM and adherence to regular PA reduce the vascular events and DM complications. [GMJ.2019;inpress:e1549]

Endothelial Dysfunction and Inflammatory Markers of Vascular Disease

2020 ◽  
Vol 19 (3) ◽  
pp. 243-249 ◽  
Author(s):  
Sevket Balta
Keyword(s):  
Endothelial Dysfunction ◽  
Vascular Disease ◽  
Inflammatory Markers ◽  
Vascular Diseases ◽  
Intima Media Thickness ◽  
Carotid Intima Media Thickness ◽  
Non Invasive ◽  
Von Willebrand ◽  
The Relationship ◽  
Willebrand Factor

: Vascular diseases are the main reason for morbidity and mortality worldwide. As we know, the earlier phase of vascular diseases is endothelial dysfunction in humans, the endothelial tissues play an important role in inflammation, coagulation, and angiogenesis, via organizing ligand-receptor associations and the various mediators’ secretion. We can use many inflammatory non-invasive tests (flowmediated dilatation, epicedial fat thickness, carotid-intima media thickness, arterial stiffness and anklebrachial index) for assessing the endothelial function. In addition, many biomarkers (ischemia modified albumin, pentraxin-3, E-selectin, angiopoietin, endothelial cell specific molecule 1, asymmetrical dimethylarginine, von Willebrand factor, endothelial microparticles and endothelial progenitor cells) can be used to evaluate endothelial dysfunction. We have focused on the relationship between endothelial dysfunction and inflammatory markers of vascular disease in this review.

From self-evident norms to contingent couplings: A systems-theoretical analysis of changes in the relationship between schools and the function systems in Denmark

2021 ◽  
pp. 147490412110097
Author(s):  
Niels Åkerstrøm Andersen ◽  
Justine Grønbæk Pors
Keyword(s):  
Theoretical Analysis ◽  
Education System ◽  
Teaching Profession ◽  
School Governance ◽  
World Society ◽  
Historical Account ◽  
And Function ◽  
The Relationship ◽  
Point Of Departure

Taking a point of departure in the paradoxical fact that the increase in educational knowledge leads to an increase in uncertainty for educational organisations, this article explores how uncertainty and contingency have increasingly become an integral part of school governance. The article draws on Niklas Luhmann’s theory of ‘World Society’ as a functional differentiated society providing a range of different symbolic media for educational organisations. To trace the increase in the complexity of governing, we provide a historical account of the shifting couplings between schools and function systems. We show how the school becomes linked to an increasing number of symbolic media so that education becomes only one out of many other concerns. The article studies the consequences these shifting couplings have for how schools are governed and how they are expected to self-manage their relationship to different function systems. The article adds to existing studies of how education has become more and more differentiated with the argument that this has also led to new forms of couplings between schools and the education system with a number of important implications for the teaching profession.

Psychological, Pedagogical and Drganizational Peculiarities of the Development of Students’ Volitional Qualities as a Factor of Success in Learning

2021 ◽  
Author(s):  
Nadiia Vientseva ◽  
◽  
Oleva Karapetrova
Keyword(s):  
Higher Education ◽  
Theoretical Analysis ◽  
Empirical Study ◽  
University Students ◽  
Education Institution ◽  
Educational Material ◽  
Academic Achievements ◽  
The Impact ◽  
The Relationship ◽  
Development Of Students

The article reports the results of the empirical study of the impact of volitional qualities development on the level of academic achievements of higher education institution students. The article gives a theoretical analysis of the main types of volitional qualities that affect the assimilation of educational material by students. There was established the level of their development and the relationship with academic achievements. The article also identifies the main psycho-pedagogical and organizational peculiarities that affect the success of mastering the knowledge by university students. The psychological and pedagogical recommendations for forming, developing and supporting the volitional sphere of students are developed.

Effects of Ride Motion on the Speed and Accuracy of In-Vehicle Pointing Tasks

2005 ◽  
Vol 49 (12) ◽  
pp. 1119-1123
Author(s):  
Kevin A. Rider ◽  
Bernard J. Martin
Keyword(s):  
Principal Direction ◽  
Three Dimensional ◽  
Movement Speed ◽  
Moving Vehicle ◽  
Combined Use ◽  
Principal Axes ◽  
Vehicle Acceleration ◽  
The Relationship ◽  
Speed And Accuracy

Terrain-induced vibration of a moving vehicle adversely affects the ability to quickly and accurately perform in-vehicle pointing tasks by altering the planned fingertip trajectory. The relationship between movement speed and accuracy is a result of the combined use of visual and somatosensory feedbacks which are used to discern movement deviations and make necessary compensatory movements. Participants (N=20) performed three-dimensional rapid pointing tasks under stationary and ride motion conditions to three touchpanel displays. Ride motion contributed to increased reaction and movement times and increased endpoint variability. Trajectory deviations were correlated to the principal direction of vehicle acceleration. Reaches orthogonal to the dominant vehicle acceleration exhibited larger endpoint variability, and reaches to the elevated touchpanel resulted in the largest variability across all motion conditions. Principal axes of endpoint ellipses were along the on-axis and off-axis directions of fingertip movement.

scholarly journals Sex moderations in the relationship between aortic stiffness, cognition, and cerebrovascular reactivity in healthy older adults

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257815
Author(s):  
Dalia Sabra ◽  
Brittany Intzandt ◽  
Laurence Desjardins-Crepeau ◽  
Antoine Langeard ◽  
Christopher J. Steele ◽  
...  
Keyword(s):  
Older Adults ◽  
Vascular Diseases ◽  
Aortic Pulse Wave Velocity ◽  
Cerebrovascular Reactivity ◽  
Neuropsychological Battery ◽  
Healthy Older Adults ◽  
Moderation Model ◽  
Continuous Arterial Spin Labeling ◽  
Cine Phase Contrast ◽  
The Relationship

It is well established that sex differences exist in the manifestation of vascular diseases. Arterial stiffness (AS) has been associated with changes in cerebrovascular reactivity (CVR) and cognitive decline in aging. Specifically, older adults with increased AS show a decline on executive function (EF) tasks. Interestingly, the relationship between AS and CVR is more complex, where some studies show decreased CVR with increased AS, and others demonstrate preserved CVR despite higher AS. Here, we investigated the possible role of sex on these hemodynamic relationships. Acquisitions were completed in 48 older adults. Pseudo-continuous arterial spin labeling (pCASL) data were collected during a hypercapnia challenge. Aortic pulse wave velocity (PWV) data was acquired using cine phase contrast velocity series. Cognitive function was assessed with a comprehensive neuropsychological battery, and a composite score for EF was calculated using four cognitive tests from the neuropsychological battery. A moderation model test revealed that sex moderated the relationship between PWV and CVR and PWV and EF, but not between CVR and EF. Together, our results indicate that the relationships between central stiffness, cerebral hemodynamics and cognition are in part mediated by sex.

scholarly journals THE ROLE OF THE RELATIONSHIP WITH THE MOTHER IN CHILDHOOD IN FORMING A WOMAN'S ATTITUDE TOWARDS HER OWN MOTHERHOOD

2020 ◽  
Vol 11 (87) ◽  
Author(s):  
Tatiana Sidorenko ◽  
◽  
Natalia Grisenko ◽  
Keyword(s):  
Theoretical Analysis ◽  
Adult Age ◽  
Personal Attitude ◽  
Psychological Science ◽  
Factors Influencing ◽  
Different Types ◽  
Main Factors ◽  
Psychological Features ◽  
The Relationship

The article is devoted to the study of such an important psychological phenomenon as an attitude of women to their own motherhood. It is summarizes the study of the problem of motherhood in psychological science in general. The article analyzes the problem of the influence of the relationship with the mother in childhood on the formation of a woman's attitude to her own motherhood in adult age. It is illuminates views of foreign and national researchers on the study of this phenomenon, as well as the essence of different areas of research on this phenomenon. Based on the theoretical analysis of the literature on this topic, the concept of "motherhood", its content and psychological essence is studied. Cultural-historical, biological, physiological and psychological aspects to the study of motherhood are singled out. The main content of scientific views on the formation of the phenomenon of motherhood is generalized. The main factors influencing the development of a woman's maternal sphere and the formation of the attitude to one's own motherhood are analyzed and considered. The content of such basic concepts as "mother's image" and "maternal relations" is revealed. The psychological features of the formation of an adequate image of the mother in the theoretical analysis of the ontogenesis of the maternal sphere are analyzed. The article also reveals the dynamics of motherhood in ontogenesis. The types of maternal relations and their role in the life of a mature woman are determined, as well as the influence of these relations on the formation of a woman's attitude to her own motherhood. The influence of different types of relationships between women and their own mothers on the level of formation of their attitude to personal motherhood has been empirically studied. Two groups of women were studied, one group had a positive relationship with their own mother, and the other had a negative one. In the course of the research the differences between different types of maternal relations and the level of formation of a woman's personal attitude to motherhood are singled out.

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