scholarly journals The Effect of α-Al2O3 Composite on Energy Storage Characteristics of the Orthogonal Phase PLZST Antiferroelectric Ceramics

2021 ◽  
Author(s):  
Yuzhe Chen ◽  
Hongwei Chen ◽  
Libin Gao ◽  
Kexin Liang ◽  
Zhiqiang Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Composite Ceramic ◽  
Test Results ◽  
Maximum Value ◽  
Al2o3 Composite ◽  
Saturation Polarization ◽  
Energy Storage Efficiency ◽  
Α Al2o3 ◽  
Orthogonal Phase ◽  
Storage Characteristics

Abstract The effect of (1-x)(Pb0.97La0.02)(Zr0.675Sn0.285Ti0.04)O3-xAl2O3, with x=0~0.04, 0.08, 0.10 composite ceramic samples was studied. In this experiment, the PLZST powder was pre-fired to obtain the perovskite structure, and then combined with α-Al2O3 to increase the BDS of the ceramic. The test results show that the composite thick film samples are all perovskite orthorhombic phases, and Al2O3 is mainly filled in the grain gaps with a flaky structure. A proper content of composite Al2O3 can increase the density of ceramics. With x=0.02, the maximum value of BDS is 25.27 kV/mm, which is 60% higher than pure PLZST material, and the releasable energy storage density also reaches a maximum of 2.95 J/cm³. After the composite amount exceeds 0.03, the saturation polarization intensity decreases significantly. The energy storage efficiency of each sample is generally not high, all of which are less than 65%.

scholarly journals Energy Storage Characteristics of MJ-Class Toroidal HTS-SMES Considering Maximum Value of Perpendicular Magnetic Field

2017 ◽  
Vol 105 ◽  
pp. 4179-4184 ◽  
Author(s):  
Ming Qiu ◽  
Shuangquan Rao ◽  
Jiahui Zhu ◽  
Shanshan Fu ◽  
Zhenming Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energy Storage ◽  
Perpendicular Magnetic Field ◽  
Maximum Value ◽  
Storage Characteristics ◽  
Hts Smes

scholarly journals The Impact of Active and Passive Thermal Management on the Energy Storage Efficiency of Metal Hydride Pairs Based Heat Storage

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3006
Author(s):  
Serge Nyallang Nyamsi ◽  
Ivan Tolj
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Management ◽  
Metal Hydride ◽  
Heat Storage ◽  
Energy Storage Density ◽  
Storage Efficiency ◽  
Transfer Enhancement ◽  
Storage Density ◽  
Energy Storage Efficiency

Two-tank metal hydride pairs have gained tremendous interest in thermal energy storage systems for concentrating solar power plants or industrial waste heat recovery. Generally, the system’s performance depends on selecting and matching the metal hydride pairs and the thermal management adopted. In this study, the 2D mathematical modeling used to investigate the heat storage system’s performance under different thermal management techniques, including active and passive heat transfer techniques, is analyzed and discussed in detail. The change in the energy storage density, the specific power output, and the energy storage efficiency is studied under different heat transfer measures applied to the two tanks. The results showed that there is a trade-off between the energy storage density and the energy storage efficiency. The adoption of active heat transfer enhancement (convective heat transfer enhancement) leads to a high energy storage density of 670 MJ m−3 (close to the maximum theoretical value of 755.3 MJ m−3). In contrast, the energy storage efficiency decreases dramatically due to the increase in the pumping power. On the other hand, passive heat transfer techniques using the bed’s thermal conductivity enhancers provide a balance between the energy storage density (578 MJ m−3) and the energy efficiency (74%). The utilization of phase change material as an internal heat recovery medium leads to a further reduction in the heat storage performance indicators (142 MJ m−3 and 49%). Nevertheless, such a system combining thermochemical and latent heat storage, if properly optimized, can be promising for thermal energy storage applications.

The preparation of ZrO2-Al2O3 composite ceramic by SLA-3D printing and sintering processing

2020 ◽  
Vol 46 (1) ◽  
pp. 937-944 ◽  
Author(s):  
Xiaoyan Liu ◽  
Bin Zou ◽  
Hongyu Xing ◽  
Chuanzhen Huang
Keyword(s):  
3D Printing ◽  
Composite Ceramic ◽  
Al2o3 Composite

Thermal energy storage characteristics of Cu–H 2 O nanofluids

Energy ◽  
2014 ◽  
Vol 78 ◽  
pp. 212-217 ◽  
Author(s):  
X.J. Wang ◽  
X.F. Li ◽  
Y.H. Xu ◽  
D.S. Zhu
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage Characteristics

Fabrication of defect-free Pd/α-Al2O3 composite membranes for hydrogen separation

1999 ◽  
Vol 350 (1-2) ◽  
pp. 106-112 ◽  
Author(s):  
Anwu Li ◽  
Weiqiang Liang ◽  
Ronald Hughes
Keyword(s):  
Composite Membranes ◽  
Hydrogen Separation ◽  
Al2o3 Composite ◽  
Α Al2o3

Improving The Student's Classroom Student's Reasoning Ability In Mathematics Lesson Through Problem Solving Efforts At Sdn 13 Kubang

2018 ◽  
Vol 1 (2) ◽  
pp. 149-158
Author(s):  
Zulfetriani Zulfetriani
Keyword(s):  
Learning Outcomes ◽  
Teaching And Learning ◽  
Basic Education ◽  
Mathematics Learning ◽  
Basic Knowledge ◽  
Test Results ◽  
Community Members ◽  
Maximum Value ◽  
Study Results ◽  
Daily Test

Basic education aims to provide basic skills to learners to develop their lives as individuals, community members, citizens and members of the human race and prepare learners to follow the next education. Primary education is organized to develop skills attitudes and provide the basic knowledge and skills necessary to live in communities and prepare learners who are eligible for secondary education (UU Sisdiknas No. 20 Year 2003 article 13). In teaching and learning activities, a teacher would have hope of desire for learners can get the maximum value possible, in accordance with the learning objectives created or desired but what can be in word, reality. For special mathematics subjects, field findings such as EBTANAS, summative test results and daily test scores and report scores indicate that the learners' learning outcomes are still below the numbers that may be unsatisfactory in both low and class high. From some study results and opinions of experts, the low mathematics learning outcomes of students is not because they are not able to perform calculations, but because they do not understand the problems contained in the problem. Hudoyo (in Laily Hasbullah: 2000: 1) states that questions related to numbers are not so difficult for learners, but the problems that use sentences are very difficult for learners who have less or less ability.  

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