A high performance oscillatory combustor burning low-grade coal

1993 ◽  
Vol 17 (8) ◽  
pp. 775-778
Author(s):  
S. B. Gupta ◽  
T. S. Sheshadri
Keyword(s):  
High Performance ◽  
Low Grade

Efficient Co-Harvesting of Solar Energy and Low-Grade Heat by Molecular Photoswitches for High Energy Density, Long-Term Stable Solar Thermal Battery

2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI
Keyword(s):  
Energy Density ◽  
Solar Energy ◽  
High Performance ◽  
High Energy ◽  
Solar Thermal ◽  
High Energy Density ◽  
Low Grade ◽  
Thermal Battery ◽  
Low Grade Heat

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.

Efficient Co-Harvesting of Solar Energy and Low-Grade Heat by Molecular Photoswitches for High Energy Density, Long-Term Stable Solar Thermal Battery

2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI
Keyword(s):  
Energy Density ◽  
Solar Energy ◽  
High Performance ◽  
High Energy ◽  
Solar Thermal ◽  
High Energy Density ◽  
Low Grade ◽  
Thermal Battery ◽  
Low Grade Heat

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.

High-Performance Porous Silicon/Nanosilver Anodes from Industrial Low-Grade Silicon for Lithium-Ion Batteries

2020 ◽  
Vol 12 (43) ◽  
pp. 49080-49089 ◽  
Author(s):  
Fengshuo Xi ◽  
Zhao Zhang ◽  
Xiaohan Wan ◽  
Shaoyuan Li ◽  
Wenhui Ma ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Low Grade ◽  
Grade Silicon

Effect of Control Technology on Properties of Quartz Porous Brick

2018 ◽  
Vol 777 ◽  
pp. 564-568 ◽  
Author(s):  
Long He ◽  
Jin Shi Li ◽  
Mei Hua Chen ◽  
Yan Yang ◽  
Xin Peng Lou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Quartz Sand ◽  
High Performance ◽  
Performance Test ◽  
Holding Time ◽  
Raw Material ◽  
Process Conditions ◽  
Low Grade ◽  
Sintering Process ◽  
Foaming Agent

A high-performance quartz sand insulation brick was prepared by using low grade quartz sand under different sintering process conditions. The optimum sintering process conditions were obtained by analyzing the relationship between microstructure and sintering process. Through the compounding, pulping, forming, drying and sintering processes, and the performance test of the porous brick, the following conclusions can be drawn, the comprehensive performance in all aspects, the porosity is similar, the preferred high compressive strength conditions, in order to get a best The bonding point, brick body sintering temperature of 1150 °C, porosity of 74.56%, compressive strength of 2.1 MPa of porous brick, and the pores are smooth, more uniform distribution. With the prolonging of the holding time, the porosity of the porous brick is reduced, and the performance is 1h, the porosity is 77.22% and the compressive strength is 2.05 MPa. When the raw material ratio is 60% quartz sand, 30wt% kaolin, calcium carbonate 9.6wt%, foaming agent 0.4wt%, water ratio 0.9 holding time at 1h sintering at 1150°C can get better porosity and compressive strength of the insulation brick. The porous material was sintered at 1150 °C, the content of foaming agent was 0.2wt%, the ratio of water to material was 0.9, and the compressive pressure and porosity were the better.

Detection of Orange Shape Structure Parameters Based on DSP

2011 ◽  
Vol 480-481 ◽  
pp. 17-20
Author(s):  
Li Zhu ◽  
Jia Quan Chen
Keyword(s):  
High Performance ◽  
Detection System ◽  
Fruit Shape ◽  
Detection Accuracy ◽  
Low Grade ◽  
Structure Parameters ◽  
Core Component ◽  
The Core ◽  
Shape Structure ◽  
High Detection

A Detection system of Orange shape structure parameters Based on DSP, including its hardware part and software part was introduced. The hardware part equipped with the high performance DSP acts as the core component of the image processing, which provides a guarantee of the real-time of the shape detection. The software part introduces the basic principle of the orange recognition arithmetic, and differentiates by Zernike moments and k-means algorithm. The experiments show it can meet the practical detection requirements that the high detection accuracy of the normal fruit shape and the low-grade fruit shape.

scholarly journals Efficient Thermal Cycle Undergoing Adiabatic Contraction Based Work by Releasing Heat

2019 ◽  
pp. 1-15
Author(s):  
Ramon Ferreiro Garcia
Keyword(s):  
Thermal Efficiency ◽  
High Performance ◽  
Mechanical Work ◽  
Heat Extraction ◽  
Working Fluid ◽  
Low Grade ◽  
Compression Process ◽  
Compression Phase ◽  
Heat Addition ◽  
Thermodynamic Transformations

By means of observational evidence it is shown that, among the vast amount of heat-work interactions occurring in closed process based transformations, there exists the possibility of doing a transformation characterized by doing useful mechanical work by contraction based compression, while increasing the internal energy. Such thermodynamic transformation has never been considered in processes. However, in reality closed contraction based compression process are physically possible in which net work is produced by contraction of a thermal working fluid while fulfilling the fundamental laws. Thus, the objective is therefore to analyze heat-work interaction modes in closed processes conducted by heat addition, heat extracting and net work done by the process. Therefore, this analysis focuses on the feasible thermodynamic transformations contributing to the achievement of efficient closed processes based thermal cycles. The proposed cycles are characterized by performing mechanical work both in the expansion phase due to heat addition, and in the compression phase due to heat releasing. The cycles achieved are characterized by operating with closed thermal processes in which both transformations with isochoric heat addition and isochoric heat extraction are associated with useful mechanical work at high performance. The analysis of the cycle between top working temperatures ranging from 350 to 700 K while botom temperature approaches 300 K has been carried out, corroborated by experimental validation for low temperatures, in the order of 350 degrees Kelvin through a test bench designed specifically for this task. It is also worth noting that the thermal efficiency is independent of the temperature ratio. Therefore the results indicate that for lower temperatures below 690 K, the thermal efficiency of the cycle exceeds the Carnot factor, which is an efficient means of recovering residual or low-grade heat efficiently.

scholarly journals Association between Bisphenol A Urine Level with Low-Grade Albuminuria in Egyptian Children and Adolescents

2021 ◽  
Vol 9 (B) ◽  
pp. 1092-1097
Author(s):  
Nermine Mahfouz ◽  
Ebtissam Salah ◽  
Ayman Armaneous ◽  
Mai M. Youssef ◽  
Mones Mahmoud Abu Shady ◽  
...  
Keyword(s):  
Bisphenol A ◽  
High Performance ◽  
Cross Sectional Study ◽  
Urinary Albumin ◽  
Whole Body ◽  
P Value ◽  
Urine Specimen ◽  
Low Grade ◽  
Cross Sectional ◽  
Egyptian Children

 The glomerulus is the accessible window to visualize the endothelial status of the whole body. Minimal level of albuminuria even below the cutoff point of microalbuminuria might be a marker of endothelial dysfunction. Exposure to Bisphenol A may be a risk factor of developing low-grade albuminuria in pediatrics. Aim: This study investigated the association of exposure to Bisphenol A and the presence of low-grade albuminuria. Methods: A cross-sectional study enrolling 158 children; 91 boys and 67 girls. Children with hepatic disease, kidney disease and endocrinopathies were excluded from the study. Urinary albumin and creatinine were measured in a first morning urine specimen. Urinary albumin/creatinine ratio was calculated in mg/gm and was stratified into: macroalbuminuria of ˃300mg/gm, microalbuminuria of 30-300mg/gm and low grade albuminuria of ˂30mg/gm. Urinary Bisphenol A was measured by high performance liquid chromatography using florescent detector. Results: Low grade albuminuria was detected in 141 participants (89.24%), while microalbuminuria and macroalbuminuria were detected in 15 (9.5%) and 2 (1.26%) participants, respectively. The total urinary Bisphenol A in candidates with low grade albuminuria was categorized into four quartiles (<0.285, 0.285–0.599, 0.600–1.215, >1.215) ng/mL and similarly their low grade albuminuria into (<2.0404, 2.0404–4.0385, 4.0386–7.3870, >7.3870) mg/gm. Children with the highest compared to the lowest quartile of urinary Bisphenol A had comparable mean of low grade albuminuria with insignificant P value. Conclusion: low grade albuminuria was found in 141 out of 158 children. A direct cause effect of exposure to Bisphenol A could not be proved. Further studies are needed to investigate the pathophysiology of low grade   albuminuria and its significance                                                                                      

scholarly journals High-performance fuel cell designed for coking-resistance and efficient conversion of waste methane to electrical energy

2020 ◽  
Vol 13 (6) ◽  
pp. 1879-1887
Author(s):  
Tao Li ◽  
Xuekun Lu ◽  
Mohamad F. Rabuni ◽  
Bo Wang ◽  
Nicholas M. Farandos ◽  
...  
Keyword(s):  
Fuel Cell ◽  
High Performance ◽  
Electrical Energy ◽  
Low Grade ◽  
Efficient Conversion

A novel micro-monolithic fuel cell converts low-grade methane efficiently to clean electrical energy.

Effect of Maitenance Technology on the Properties of Quartz Sand Unfired Porous Materials

2014 ◽  
Vol 633 ◽  
pp. 295-298
Author(s):  
Jie Guang Song ◽  
Fang Wang ◽  
Xiu Qin Wang ◽  
Ming Han Xu ◽  
Da Ming Du ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Porous Materials ◽  
Quartz Sand ◽  
High Performance ◽  
Raw Material ◽  
Low Grade ◽  
Insulating Materials ◽  
The Third ◽  
Quartz Sands

The low grade quartz sands is the main raw material to prepare the unfired porous brick through adjusting the maitenance technology. The compressive strength of brick is higher with the maitenance temperature for 40¡æ. The compressive strength of brick is higher with the longer maitenance time. The high performance brick is prepared via the third technology, the pore of brick is more and uniform, it is bowl shape, that is close pore, which provide the reference for preparing the heat insulating materials. The compressive strength of brick is 1.9MPa, the density is 0.628 g/cm3.

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