Theoretical analysis on long-term deflection of GFRP-concrete hybrid structures with partial interaction

2019 ◽  
Vol 216 ◽  
pp. 1-11 ◽  
Author(s):  
Shiqian Zhang ◽  
W.C. Xue ◽  
Xiandong Liao
Keyword(s):  
Theoretical Analysis ◽  
Hybrid Structures ◽  
Partial Interaction

Theoretical Analysis of the Mass Transport in the Powder Charge in Long-Term Bulk SiC Growth

2004 ◽  
Vol 457-460 ◽  
pp. 67-70 ◽  
Author(s):  
A.V. Kulik ◽  
M.V. Bogdanov ◽  
S.Yu. Karpov ◽  
M.S. Ramm ◽  
Yuri N. Makarov
Keyword(s):  
Theoretical Analysis ◽  
Mass Transport ◽  
Powder Charge

scholarly journals Biomechanical changes on the typical sites of pressure ulcers in the process of turning over from supine position: theoretical analysis, simulation and experiment

2021 ◽  
Author(s):  
Peng Su ◽  
Qinglong Lun ◽  
Da Lu ◽  
Qiulong Wu ◽  
Tian Liu ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Contact Pressure ◽  
Pressure Ulcer ◽  
Supine Position ◽  
Pressure Ulcers ◽  
Pressure Curve ◽  
Element Analysis ◽  
Simulation And Experiment ◽  
Biomechanical Changes

Abstract Background Pressure ulcer is a typical disease, which is common in long-term bedridden patients and difficult to cure. It is necessary to study the biomechanics of the typical sites of pressure ulcers in turning over from supine position, which is an important reference for clinical medical nursing and and guides an assisted exoskeleton robot design. Methods The typical sites of pressure ulcers mainly focus on the scapula and the hip-sacrum of the trunk in turning over from the supine position. Based on the requirements of rehabilitation technical aids and the anatomy theory, the simple model of the scapula and the hip-sacrum were established for a force analysis in the process of turning over from the supine position, and the theoretical contact pressure between the human body and the bed surface was obtained. Then, three-dimensional models of the scapula and hip- sacrum were reconstructed and the maximum stress under different boundary conditions was obtained by finite element analysis. Finally, the pressure distribution sensor was used to carry out the human experiment of turning over from the supine position, and the pressure cloud diagram and the maximum contact pressure curve of the shoulder blade and the hip were obtained under different angles of turning over. Results The results from theoretical analysis, simulation and experiment were almost the same change trends, and the curves and the stress diagrams showed the contact pressure change of the typical sites of pressure ulcers in turning over. The angle threshold of the optimal comprehensive pressure can improve the use efficiency of the equipment to assist human turning over and reduce the incidence of pressure ulcers in the use of assisted bed in long-term bedridden patients. Conclusions In response to the less research on the mechanism of pressure ulcer, biomechanical changes have been revealed, which helps to explain the causes of pressure ulcer disease and provide basis for improving clinical nursing, and the relevant results provided a reference that contributes to the man-machine coupling design of the assisted rollover robot.

Oscillatory Fouling in Condensers in Cooling Tower Systems

2019 ◽  
Vol 12 (2) ◽  
Author(s):  
Wei Li
Keyword(s):  
Theoretical Analysis ◽  
Cooling Tower ◽  
Oscillatory Behavior ◽  
Water Velocity ◽  
Experimental Uncertainty ◽  
Physical Mechanisms ◽  
The Mean ◽  
Relationship Of ◽  
The Relationship

Abstract Oscillatory fouling in condensers using cooling tower water was recognized in 1980s, but it had not yet been theoretically analyzed. Without careful theoretical analysis, it is easy to think that oscillatory fouling phenomenon is generated from experimental uncertainty. The new analysis is to split the fouling rate into a mean variable and a fluctuating variable. The mean variable exhibits an asymptotic behavior, and the fluctuating variable exhibits an oscillatory behavior. A theoretical analysis based on the relationship of continuity is used to present fouling oscillatory behavior along the space and time dimensions simultaneously to provide the intuitive understanding in physical mechanisms driving the phenomenon. A series of long-term cooling tower water fouling tests were conducted: fouling data collected in two copper helically ribbed tubes with the same internal and external diameters and different inside geometric parameters at the same water velocity in condenser in practical cooling tower conditions present oscillatory behavior. The frequencies of the fluctuation are the same for the two tested tube geometries. The spatial and the temporal oscillatory fouling behaviors presented in the experimental results are predicted by the theoretical analysis.

Treatment of Patients with Clavicle Fractures and Their Sequelae on the Basis of Biomechanical Conception of Bone Fragments Fixation

2009 ◽  
Vol 16 (2) ◽  
pp. 15-21
Author(s):  
I M Pichkhadze ◽  
Artak Matsakovich Matsakyan ◽  
K A Kuz'menkov ◽  
A V Zhadin ◽  
A V Tsiskarashvili ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Experimental Studies ◽  
Long Term Results ◽  
Different Types ◽  
Bone Fragments ◽  
Osteosynthesis Techniques ◽  
Clavicle Fractures

Basing on the results of theoretical analysis and experimental studies, biomechanical characteristics (resistance to displacement) of clavicle fragments of various length were determined. With regard for obtained data the requirements and indications to the application of various osteosynthesis techniques (transosseous, epiosseous, intramedullar) in different types of fractures were formulated. Treatment of clavicular fractures and their sequelae in accordance with biomecha-nical conception of fragments fixation was performed in 223 patients. Long term results were evaluated in 178 patients. Excellent results were achieved in 135 (75.9%) cases, good - in 26 (14.6%), satisfactory - in 10 (5.6%) and unsatisfactory - in 7 (3.9%) of cases. The results of the study showed that at observance of all biomechanical principles of bone fragments fixation it was possible to improve the outcomes of clavicular fractures treatment and to reduce the rate of complications considerably.

Theoretical Analysis of Ionization in Long-Term Air Discharge Plasmas at Atmospheric Pressure

2016 ◽  
Vol 44 (11) ◽  
pp. 2530-2535 ◽  
Author(s):  
Nikolay V. Ardelyan ◽  
Vladimir L. Bychkov ◽  
Konstantin V. Kosmachevskii
Keyword(s):  
Theoretical Analysis ◽  
Atmospheric Pressure ◽  
Discharge Plasmas ◽  
Air Discharge

scholarly journals Long-Term Effects of Temporal Lobe Epilepsy on Local Neural Networks: A Graph Theoretical Analysis of Corticography Recordings

PLoS ONE ◽  
2009 ◽  
Vol 4 (11) ◽  
pp. e8081 ◽  
Author(s):  
Edwin van Dellen ◽  
Linda Douw ◽  
Johannes C. Baayen ◽  
Jan J. Heimans ◽  
Sophie C. Ponten ◽  
...  
Keyword(s):  
Neural Networks ◽  
Theoretical Analysis ◽  
Temporal Lobe Epilepsy ◽  
Temporal Lobe ◽  
Long Term Effects ◽  
Graph Theoretical Analysis

scholarly journals Innovation through the prism of companies using direct marketing. An empirical example from Bulgaria

VUZF Review ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 11-15
Author(s):  
Mihaela Mihaylova
Keyword(s):  
Theoretical Analysis ◽  
Direct Marketing ◽  
Empirical Results ◽  
Collection Record ◽  
Current Article ◽  
Automated Process ◽  
Customer's Loyalty

The current article presents empirical results on the frequency and type of innovations applied by companies in Bulgaria that are using direct marketing. The research is provoked by the dynamic and changing nature of direct marketing. As one of the main characteristics of direct marketing is the absence of intermediaries, the companies should constantly develop their knowledge and competences so they can improve their contact and communication with their customers in order to apply correctly and profitably the three approached associated with direct marketing. They are: the personalization in dealing with customers, the establishment of long-term relationships and the generation of customer’s loyalty, and they happen through different media. An appropriate application of these approaches requires collection, record and analysis of information which is being more and more executed as an automated process. The different and new types of media, in turn, require methods and understanding that further develop or eliminate existing practices, beliefs, and technologies. In this context, a theoretical analysis of innovations is being first conducted. After having a structured division of innovations by their types a brief questionnaire is being developed. As a result, the report summarizes the intersections of the theory with the established practice in 97 companies in Bulgaria.

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