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
2019 ◽  
Vol 3 (1) ◽  
pp. 753-763 ◽  
Author(s):  
David Wood ◽  
John Davey ◽  
Plamen Atanassov ◽  
Rod Borup
Keyword(s):  

2014 ◽  
Vol 9 (1) ◽  
pp. 142-165
Author(s):  
Shree Raj Shakya

Development of low carbon electricity based mass transport is considered as one of the promising options for perusing the low carbon development (LCD) path in 21st century by the global communities. But long term economy-wide implications of such policy is very much country specifics citing their variations in the availability and tapping potential of indigenous clean energy resources, access to the clean technologies, affordability and acceptability of such technologies, and so on. This paper studies the economy-wide consequences of introducing different levels of electrified mass transport systems in Nepal on the long term basis. The study develops and uses a multi-sector, single region, recursive dynamic computable general equilibrium model of Nepal (Nepal-TRNSCGE) with technology level disaggregation in the transport and electricity sectors. The study indicates that under transport electrification scenarios consisting of 10% to 30% electrification of the transport sector as compared to the base case by 2050, the country would benefit economically with the value of cumulative undiscounted GDP increasing in the range of 2.6% to 3.1% and the value of cumulative undiscounted equivalent variation in income (household welfare) increasing in the range of 25.3% to 147.9% during 2005 to 2050. The policy would promote energy efficiency improvement and cleaner economic development with significant reduction in the energy intensity of GDP in the range of 3.1% to 4.1% and greenhouse gas intensity of GDP in the range of 4.7% to 7.1%. This highlights the potential role of low carbon electricity based transport in achieving the LCD path in the country. Introducing foreign direct investment would further increase GDP but reduce household welfare. DOI: http://dx.doi.org/10.3126/jie.v9i1.10679Journal of the Institute of Engineering, Vol. 9, No. 1, pp. 142–165


2010 ◽  
Vol 157 (8) ◽  
pp. B1251 ◽  
Author(s):  
David L. Wood ◽  
Rodney L. Borup
Keyword(s):  

2021 ◽  
Author(s):  
Peng Su ◽  
Qinglong Lun ◽  
Da Lu ◽  
Qiulong Wu ◽  
Tian Liu ◽  
...  

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.


Author(s):  
Wei Li

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.


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