Article
Polymer Science
Aimei Yu, Ying Xi, Weigang Xu, Ao Wang, Lin Liu, Lin Zhang
Summary: Three types of newly flexible positive temperature coefficient (PTC) materials were prepared using a simple method. The materials exhibited a remarkable PTC effect, with a PTC intensity of over four orders magnitude and a resistivity-temperature coefficient of 154%/degrees C, due to the introduction of a hybrid filler of carbon nanotube and carbon black. The Curie points of the PTC materials were regulated to the room temperature range by a low melting phase and were influenced by the melting onset temperatures of their solid-liquid phase change. Observation with a transmission electron microscope revealed the micro-capsule structure of the phase change regions, in which hybrid conductive fillers randomly distributed in the blend matrix to form a three-dimensional conductive network. The use of these PTC materials as heating elements allowed the controlled devices to maintain an equilibrium temperature around their Curie point without the need for any control method. The adaptive thermal control effect became more pronounced with increasing ambient temperature and initial heating power. The thermal control accuracy fluctuated within 0.15 degrees C without any external control method and improved to 0.08 degrees C in combination with the switch control method. This study provides a new method for the thermal control of electronic devices in low temperature environments emphasizing lightweight and miniaturization.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Maozheng Wang, Xingliang Jiang, Yijun Yuan, Fangrong Zhou, Tao Li
Summary: This paper establishes and experimentally verifies a conductive model for low Curie point PTC material, and investigates the PTC effects of materials with different mass proportions. The feasibility of using the low Curie point PTC material for electrothermal anti-icing is confirmed, and the material shows excellent stability.
MATERIALS CHEMISTRY AND PHYSICS
(2024)
Article
Engineering, Multidisciplinary
Yu AiMei, Li Qiang
Summary: This study presents a series of novel conductive polymer composites with optimized properties through adjusting hybrid fillers and matrix combinations, achieving self-regulating heating effects and strong thermal control capabilities in changing environment temperatures. These materials have great potential to replace traditional active thermal control means.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Materials Science, Ceramics
Zdenek Chlup, Daniel Drdlik, Hynek Hadraba, Oldrich Sevecek, Filip Siska, Jiri Erhart, Karel Maca
Summary: The purpose of this article is to clarify the fundamental processes that occur near the Curie temperature, with a focus on the fracture behavior of pure polycrystalline barium titanate. The study combines experimental methods with numerical simulations to investigate the effects of grain size on the material's temperature, lattice transformation, and mechanical properties. Understanding this behavior is essential for the processing and correct application of lead-free barium titanate materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Meng Yang, Hongmei Zhong, Tao Li, Bangyao Wu, Zuankai Wang, Dazhi Sun
Summary: This study proposes a temperature-adaptive design for passive radiative cooling (PRC) by integrating PRC with temperature control of room-temperature phase change material. The phase change material-enhanced radiative cooler (PCMRC) can adjust its performance according to the temperature of day and night, reducing the temperature difference between them. The PCMRC achieved an average subambient temperature drop of -6.3 degrees C under direct sunlight and an average temperature rise of -2.1 degrees C above ambient temperature at night, showing great promise for the regulation of passive radiative cooling.
Article
Thermodynamics
Wei Zhang, Rui Zhao, Wen-Long Cheng
Summary: PTC materials have the potential to replace complex temperature control systems in space applications due to their ability to combine heating, temperature measurement, and temperature control. This study investigates the temperature control effect and criteria of PTC materials in dynamic thermal environments using theoretical derivation and numerical simulation methods. The research reveals that material property parameters and ambient temperature significantly influence the temperature control accuracy and response speed. The findings also indicate that certain parameters can improve both the control accuracy and the response time. The study provides temperature control laws and theoretical foundations for the regulation and optimization of material properties and the use of PTC thermal control in space applications.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Materials Science, Multidisciplinary
Chun-Lin Lin, Jhuo-Lun Lee, Shih-Ming Kuo, Ming-Yen Li, Lu Gan, Hideyuki Murakami, Seiji Mitani, Stephane Gorsse, An-Chou Yeh
Summary: This study found that reducing the Cr and Mn content in the Co-Cr-Fe-Mn-Ni system can significantly decrease the thermal expansion coefficient of high entropy alloys, exhibiting similar thermal expansion behavior to that of Invar alloys; the abrupt change in thermal expansion behavior of high entropy alloys is associated with the transition from ferromagnetism to paramagnetism, and these alloys may exhibit the dimensional stability of the Invar effect.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Ceramics
Haiyan Zhao, Xiaole Yu, Fanlin Li, Huijing Yang, Qiangqiang Guo, Zhen Zhang
Summary: The simultaneous achievement of large piezoelectricity and excellent thermal stability in a piezoceramic material is highly desired for advanced high-temperature electromechanical coupling devices. In this study, a novel zBiScO3-xBiInO3-yPbTiO3 ternary perovskite piezoceramic material was used to achieve a large high-temperature piezoelectric coefficient with a small fluctuation rate over a wide temperature range. The optimal composition of the perovskite ceramics showed excellent high-temperature piezoelectric properties and stability, making them suitable for harsh elevated temperature electromechanical coupling applications.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
Mu Lan, Rong Wang, Yu Song, Su-Huai Wei
Summary: The difficulty of increasing the Curie temperature Tc of magnetic semiconductors such as (Ga,Mn)As above room temperature is due to the p-type doping bottleneck. To overcome this bottleneck, we investigated the doping properties of Mn in GaAs using hybrid functional calculations and proposed strategies to improve the p-type dopability in (Ga,Mn)As. We found that tensile strain and high temperature quenching are effective approaches to enhance p-type doping in epitaxial (Ga,Mn)As.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
Yazhu Dong, Kunyu Zhao, Zhiyong Zhou, Ruihong Liang
Summary: The study investigates the BS-xBPZnT system using doping of Bi and Zn ions in order to achieve complex micro-domain structures and build morphotropic phase boundaries. The results show that BS-xBPZnT ceramics exhibit high piezoelectric coefficients and Curie temperatures, as well as good stability in high-temperature environments, suggesting their potential application for high-temperature environments.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Thermodynamics
S. Wilhelmy, A. Zimare, Q. Zhang, M. Rettenmayr, S. Lippmann
Summary: The method presents a rapid and accurate way to determine the Curie temperature T_C based on the variations in thermal conductivity and thermal diffusivity, by measuring temperature profiles of samples under a temperature gradient.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Polymer Science
Stepan V. V. Lomov, Iskander S. S. Akmanov, Qiang Liu, Qi Wu, Sergey G. G. Abaimov
Summary: The temperature dependence of the electrical conductivity/resistivity of CNT networks is observed to be negative, especially for aligned CNTs (A-CNTs). This study investigates the role of three phenomena, namely the temperature dependence of the intrinsic conductivity of CNTs, the tunnelling resistance of their contacts, and thermal expansion of the network, on the temperature coefficient of resistance (TCR). The results show that the TCR of the CNTs themselves is the main factor influencing the TCR of the film, while the TCR of the tunnelling contacts and film thermal expansion have marginal effects.
Article
Thermodynamics
Shiri Liang, Feng Xu, Wenxin Li, Wenxing Yang, Shubo Cheng, Hua Yang, Jing Chen, Zao Yi, Peipei Jiang
Summary: In this paper, an intelligent thermal controlled radiation emitter based on Vanadium Dioxide is studied, which can switch between high-temperature heat dissipation and low-temperature heat preservation. It exhibits effective thermal control performance and holds significant prospects for applications in various fields.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Tsung-Shine Ko, En-Ting Lin, Xin-Wen Huang, Po-Tang Wu, Yi-Lin Yang
Summary: This study investigates the synthesis and properties of MoxW1-xS2 ternary compound. The results show that MoxW1-xS2 samples have unique Raman spectra and sheet-like surface morphology, making them suitable for thermal sensors.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Tayebeh Movlarooy, Adeleh Vatankhahan
Summary: In this study, the stability and various characteristics of chromium phosphorus nanoribbons (CrPNRs) were examined. The results indicate that the nanoribbon is stable and has an indirect band gap and metallic properties. The nanoribbon also exhibits magnetic properties and shows potential for nanoelectronic and spintronic applications at room temperature.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.