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学者姓名:何雅玲

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< Page ,Total 106 >
The study of heat-mass transfer characteristics and optimization on electric arc furnace with the novel fence electrode EI SCIE Scopus
期刊论文 | 2022 , 309 | APPLIED ENERGY
SCOPUS Cited Count: 1
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Abstract :

In this paper, a fence electrode design was proposed to optimize energy allocation in the EAF. The fence electrode includes a cylindrical main electrode (M-electrode) and circular smaller cylindrical assisted electrodes (A -electrodes). Five working parameters affecting the smelting performance were determined afterward, which include the height diameter ratio psi, electrode immersion ratio chi, main electrode voltage parameter upsilon(m), assisted electrode voltage parameter upsilon a, and smelting time parameter tau. Furthermore, the orthogonal analysis method was used to investigate the synergetic mechanism of operating parameters on four indicators. The four indicators consisting of liquid volume fraction beta, energy efficiency eta, temperature rise index sigma, and temperature uniformity index xi. The optimal fence electrode electric arc furnace (F-EAF) operating parameters were then automatically given by the back propagation (BP) neural network predicting model and non-dominated sorting genetic algorithm II (NSGA-II), and compared with the optimal traditional single electrode electric arc furnace (S-EAF). The fence electrode design was finally verified by industrial experiments. The results show that the fence electrode can effectively homogenize the energy distribution and provide arc heat directly to the side zone in EAF. Increasing A-electrode voltage has a significant advantage in terms of increasing the smelting rate, but it also significantly raises the overall temperature, which is not conducive to smelting safety. In the case of psi = 0.75 and chi = 0.4, upsilon a increases from 0.1 to 0.3, tau(max) and eta max decrease by 34.2 and 8.0%, respectively. By correlation analysis, it can be known that the A-electrode is an important factor for the F-EAF adjustment ability. Compared with the S-EAF, the F-EAF smelting performance is improved significantly. After multi-objective optimization, F-EAF tau(max) and sigma max reduce by 8.9 and 0.6%, respectively. At the same time, eta(max) and xi(ave) have increased by an average of 1.4 and 2.6%, respectively. The industrial experiments reveal that the fence electrode design can not only effectively homogenize the EAF energy supply, but also can overcome the shortcoming of arc deflection, making the smelting process more stable. In conclusion, F-EAF contributes to the EAF smelting performance evaluation, and this new proposal opens up novel ideas for the future development of EAF design.

Keyword :

Back propagation (BP) neural network predicting model Brown corundum Fence electrode Fence electrode electric arc furnace (F-EAF) Non-dominated sorting genetic algorithm II (NSGA-II) Orthogonal analysis

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GB/T 7714 Zhang, Xuan-Kai , He, Ya-Ling , Hu, Xin et al. The study of heat-mass transfer characteristics and optimization on electric arc furnace with the novel fence electrode [J]. | APPLIED ENERGY , 2022 , 309 .
MLA Zhang, Xuan-Kai et al. "The study of heat-mass transfer characteristics and optimization on electric arc furnace with the novel fence electrode" . | APPLIED ENERGY 309 (2022) .
APA Zhang, Xuan-Kai , He, Ya-Ling , Hu, Xin , Zhou, Han-Qi . The study of heat-mass transfer characteristics and optimization on electric arc furnace with the novel fence electrode . | APPLIED ENERGY , 2022 , 309 .
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Study on the theoretical calculation method for the effective thermal conductivity of carbon nanotube composite molten salt for solar energy application EI SCIE Scopus
期刊论文 | 2022 , 238 | SOLAR ENERGY MATERIALS AND SOLAR CELLS
SCOPUS Cited Count: 6
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Abstract :

Carbonate salt is a potential heat storage material for solar thermal power. Aimed at calculating the effective thermal conductivity of Li2CO3-K2CO3 eutectic doped with carbon nanotube (CNT), a theoretical calculation method based on the three-dimensional random curl structure model was developed. Meanwhile, for the purpose of method verification, CNT composite molten salt was prepared by high-energy ball grinding method. The curl degree of carbon nanotube was determined by image identification technique. The effective thermal conductivity of the composite molten salt was measured to validate the calculation model. The comparison showed that, for well-mixed CNT composite molten salt, the error of the theoretical calculation model was less than 8.5%, which indicated that this calculation model can be used to calculate the effective thermal conductivity of CNT composite molten salt. Moreover, the influence of key factors such as the curl degree and aspect ratio of CNT on the effective thermal conductivity of composite molten salt were revealed. The results included that, first, the effective thermal conductivity (lambda(eff)) of composite molten salt decreased with increasing CNT curl degree. Second, increasing CNT aspect ratio to 175 could improve lambda(eff) of composite molten salt. Third, the increase of CNT thermal conductivity was the key factor to the improvement of lambda(eff) of composite molten salt. Fourth, lambda(eff) of the composite molten salt could be significantly increased when the order of magnitude of the interfacial thermal resistance (m(2).K.W-1) was reduced to 10(-7).

Keyword :

Effective thermal conductivity Microscopic model Nanocomposite molten salt Numerical simulation

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GB/T 7714 Yuan, Fan , He, Ya-Ling , Li, Meng-Jie et al. Study on the theoretical calculation method for the effective thermal conductivity of carbon nanotube composite molten salt for solar energy application [J]. | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2022 , 238 .
MLA Yuan, Fan et al. "Study on the theoretical calculation method for the effective thermal conductivity of carbon nanotube composite molten salt for solar energy application" . | SOLAR ENERGY MATERIALS AND SOLAR CELLS 238 (2022) .
APA Yuan, Fan , He, Ya-Ling , Li, Meng-Jie , Li, Xiao-Yue . Study on the theoretical calculation method for the effective thermal conductivity of carbon nanotube composite molten salt for solar energy application . | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2022 , 238 .
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Pore-scale investigation on the multi-component gas adsorption and diffusion in carbon xerogel microporous structure using molecular simulation methods EI SCIE Scopus
期刊论文 | 2022 , 337 | MICROPOROUS AND MESOPOROUS MATERIALS
WoS CC Cited Count: 1 SCOPUS Cited Count: 6
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Abstract :

The atomic model of carbon xerogel microporous structure is reconstructed by a modified virtual porous carbon (VPC) model. The physical parameters of the reconstructed model, especially the predicted nitrogen adsorption isotherm, agree well with the experimental data. Then, the adsorption and diffusion of the gas in carbon xerogel microporous structure are investigated at the pore-scale. The results show that decreases of isosteric adsorption heat and the excess adsorption in carbon xerogel microporous structure are majorly contributed by the desorption of adsorbates in ultramicropores with the temperature increasing. The microporous structure appears a strong selectivity for oxygen in the air, due to the molecular sieving effect and the strong solid-fluid interaction between the pore wall and oxygen. As the desorption of oxygen in ultramicropores due to its increasing steric repulsion with the temperature rising from 298 K to 573 K, the selectivity of microporous structure for oxygen decreases, and the gap between isosteric adsorption heat for nitrogen and oxygen is narrowed. The systemic migration of gas molecules from the ultramicropores to the wider area is observed by the pore-scale analysis, and it makes the gas diffusivity appear an approximately linear relationship with the temperature.

Keyword :

Adsorption Atomic modeling Carbon xerogel Diffusion Microporous structure

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GB/T 7714 Dai, Jia-Peng , Li, Dong , He, Ya-Ling et al. Pore-scale investigation on the multi-component gas adsorption and diffusion in carbon xerogel microporous structure using molecular simulation methods [J]. | MICROPOROUS AND MESOPOROUS MATERIALS , 2022 , 337 .
MLA Dai, Jia-Peng et al. "Pore-scale investigation on the multi-component gas adsorption and diffusion in carbon xerogel microporous structure using molecular simulation methods" . | MICROPOROUS AND MESOPOROUS MATERIALS 337 (2022) .
APA Dai, Jia-Peng , Li, Dong , He, Ya-Ling , Du, Shen , Li, Jun-Ning . Pore-scale investigation on the multi-component gas adsorption and diffusion in carbon xerogel microporous structure using molecular simulation methods . | MICROPOROUS AND MESOPOROUS MATERIALS , 2022 , 337 .
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Receiver with light-trapping nanostructured coating: A possible way to achieve high-efficiency solar thermal conversion for the next-generation concentrating solar power EI SCIE Scopus
期刊论文 | 2022 , 185 , 159-171 | RENEWABLE ENERGY
WoS CC Cited Count: 1 SCOPUS Cited Count: 17
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Abstract :

To improve the receiver's solar-thermal conversion efficiency at high temperature for the next-generation concentrating solar power (CSP), a receiver with the light-trapping nanostructured coating is proposed herein. However, for the CSP plant with the light-trapping nanostructure coated receiver, the scale of the heliostat field is on the order of meters (similar to 10m), the solar receiver tube on the order of millimeters (similar to 10 mm), and the light-trapping coating on the order of nanometers (similar to 100 nm). The whole system spans nine orders of magnitude, which makes it extremely complicated and difficult to evaluate the receiver's optical and thermal performance. To solve this problem, a multi-scale model is proposed by combining Monte Carol Ray tracing method (MCRT), finite difference time domain (FDTD) method, and finite volume method (FVM). Then, the influences of three typical light-trapping nanostructured coatings, including pyramid nanostructure, moth-eye nanostructure, and cone nanostructure, on the receiver's optical-thermal performance are studied. Among these three typical nanostructures, the cone nanostructure can maximize the receiver's optical-thermal performance, with a receiver efficiency more than 88%, which is higher than that of the commercial Pyromark2500 coating by 6e10% points. The study demonstrates that the receiver with light-trapping nanostructured coatings can achieve high receiver efficiency for the next-generation CSP. (c) 2021 Published by Elsevier Ltd.

Keyword :

Concentrating solar power Light-trapping nanostructured coating Solar receiver Solar thermal conversion

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GB/T 7714 Wang, Wen-Qi , Li, Ming-Jia , Jiang, Rui et al. Receiver with light-trapping nanostructured coating: A possible way to achieve high-efficiency solar thermal conversion for the next-generation concentrating solar power [J]. | RENEWABLE ENERGY , 2022 , 185 : 159-171 .
MLA Wang, Wen-Qi et al. "Receiver with light-trapping nanostructured coating: A possible way to achieve high-efficiency solar thermal conversion for the next-generation concentrating solar power" . | RENEWABLE ENERGY 185 (2022) : 159-171 .
APA Wang, Wen-Qi , Li, Ming-Jia , Jiang, Rui , Hu, Yi-Huang , He, Ya-Ling . Receiver with light-trapping nanostructured coating: A possible way to achieve high-efficiency solar thermal conversion for the next-generation concentrating solar power . | RENEWABLE ENERGY , 2022 , 185 , 159-171 .
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A general and rapid method to evaluate the effect of flow maldistribution on the performance of heat exchangers EI SCIE
期刊论文 | 2021 , 170 | INTERNATIONAL JOURNAL OF THERMAL SCIENCES
WoS CC Cited Count: 2
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Abstract :

The effect of non-uniform flow on thermal performance of heat exchanger was analyzed in this paper. The quantitative relationships between velocity deviation factor and heat transfer coefficient, heat transfer capacity, entransy-dissipation-based thermal resistance, were obtained, respectively. Based on these relationships, an evaluation plot was proposed to evaluate the effect of flow maldistribution on thermal performance. The plot was divided into three zones according to various degrees of deterioration. In Zone I (stable zone), the variations of amplitude of heat transfer characteristics is negligible with the increase of the velocity deviation factor. In Zone II (deterioration zone), the increasing velocity deviation factor results in thermal performance reducing in a modest rate. In Zone III (rapid deterioration zone), thermal performance deteriorates rapidly with the increase of velocity deviation factor. The predicted results of the evaluation plot were compared with abundant simulations and experiments from references, which cover cases of variable velocity deviation factors, different flow distribution profiles and various types of heat exchangers. The excellent agreement of the comparisons has proved that the plot can be successfully applied to rapidly evaluate the effect of non-uniform flow on thermal performance of heat exchanger with high accuracy. Meanwhile, traditional researches on thermal performance of heat exchanger with uniform flow can be easily translated into that of non-uniform flow by this plot method.

Keyword :

Deterioration Heat exchanger Maldistribution Rapid evaluation Thermal performance

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GB/T 7714 Zhang, Kai , Li, Ming-Jia , Liu, Hua et al. A general and rapid method to evaluate the effect of flow maldistribution on the performance of heat exchangers [J]. | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2021 , 170 .
MLA Zhang, Kai et al. "A general and rapid method to evaluate the effect of flow maldistribution on the performance of heat exchangers" . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES 170 (2021) .
APA Zhang, Kai , Li, Ming-Jia , Liu, Hua , Xiong, Jian-Guo , He, Ya-Ling . A general and rapid method to evaluate the effect of flow maldistribution on the performance of heat exchangers . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2021 , 170 .
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RETRACTION: Constructing interfacial potential barrier via a gradient configuration: an effective method to enhance energy-filtering effect (Retraction of Vol 8, art no NWAA223, 2020) SCIE CSCD
期刊论文 | 2021 , 8 (3) | NATIONAL SCIENCE REVIEW
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GB/T 7714 Lin, Zizhen , Li, Yinshi , He, Ya-Ling . RETRACTION: Constructing interfacial potential barrier via a gradient configuration: an effective method to enhance energy-filtering effect (Retraction of Vol 8, art no NWAA223, 2020) [J]. | NATIONAL SCIENCE REVIEW , 2021 , 8 (3) .
MLA Lin, Zizhen et al. "RETRACTION: Constructing interfacial potential barrier via a gradient configuration: an effective method to enhance energy-filtering effect (Retraction of Vol 8, art no NWAA223, 2020)" . | NATIONAL SCIENCE REVIEW 8 . 3 (2021) .
APA Lin, Zizhen , Li, Yinshi , He, Ya-Ling . RETRACTION: Constructing interfacial potential barrier via a gradient configuration: an effective method to enhance energy-filtering effect (Retraction of Vol 8, art no NWAA223, 2020) . | NATIONAL SCIENCE REVIEW , 2021 , 8 (3) .
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The Two-Level Stabilized Finite Element Method Based on Multiscale Enrichment for the Stokes Eigenvalue Problem SCIE CSCD
期刊论文 | 2021 , 41 (2) , 381-396 | ACTA MATHEMATICA SCIENTIA
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Abstract :

In this paper, we first propose a new stabilized finite element method for the Stokes eigenvalue problem. This new method is based on multiscale enrichment, and is derived from the Stokes eigenvalue problem itself. The convergence of this new stabilized method is proved and the optimal priori error estimates for the eigenfunctions and eigenvalues are also obtained. Moreover, we combine this new stabilized finite element method with the two-level method to give a new two-level stabilized finite element method for the Stokes eigenvalue problem. Furthermore, we have proved a priori error estimates for this new two-level stabilized method. Finally, numerical examples confirm our theoretical analysis and validate the high effectiveness of the new methods.

Keyword :

multiscale finite element method P-1 P-1 elements the Stokes eigenvalue problem Two-level

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GB/T 7714 Wen, Juan , Huang, Pengzhan , He, Ya-Ling . The Two-Level Stabilized Finite Element Method Based on Multiscale Enrichment for the Stokes Eigenvalue Problem [J]. | ACTA MATHEMATICA SCIENTIA , 2021 , 41 (2) : 381-396 .
MLA Wen, Juan et al. "The Two-Level Stabilized Finite Element Method Based on Multiscale Enrichment for the Stokes Eigenvalue Problem" . | ACTA MATHEMATICA SCIENTIA 41 . 2 (2021) : 381-396 .
APA Wen, Juan , Huang, Pengzhan , He, Ya-Ling . The Two-Level Stabilized Finite Element Method Based on Multiscale Enrichment for the Stokes Eigenvalue Problem . | ACTA MATHEMATICA SCIENTIA , 2021 , 41 (2) , 381-396 .
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Release of methane from nanochannels through displacement using CO2 EI SCIE
期刊论文 | 2021 , 11 (25) , 15457-15466 | RSC ADVANCES
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In this work, we investigate the release of methane in quartz nanochannels through the method of displacement using carbon dioxide. Molecular dynamics (MD) simulations and theoretical analysis are performed to obtain the release percentage of methane for nanochannels of various diameters. It is found that both the pressure of CO2 and the channel size affect the release percentage of methane, which increases with increasing pressure of CO2 and channel diameter. Without CO2, the majority of methane molecules are adsorbed by the channel surface. When CO2 is injected into the channel, CO2 molecules replace many methane molecules due to the relatively strong molecular interactions between CO2 and the channel, which leads to the desorption of methane, reduces the energy barrier for the transport of methane, and consequently increases the release rate. Theoretical predictions using the kinetic energy of methane and the energy barrier inside the channel are also conducted, which are in good agreement with the MD simulations.

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GB/T 7714 Cheng, Xu , Li, Zhigang , He, Ya-Ling . Release of methane from nanochannels through displacement using CO2 [J]. | RSC ADVANCES , 2021 , 11 (25) : 15457-15466 .
MLA Cheng, Xu et al. "Release of methane from nanochannels through displacement using CO2" . | RSC ADVANCES 11 . 25 (2021) : 15457-15466 .
APA Cheng, Xu , Li, Zhigang , He, Ya-Ling . Release of methane from nanochannels through displacement using CO2 . | RSC ADVANCES , 2021 , 11 (25) , 15457-15466 .
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Retraction: Constructing interfacial potential barrier via a gradient configuration: an effective method to enhance energy-filtering effect SCIE PubMed CSCD
期刊论文 | 2021 , 8 (3) | NATIONAL SCIENCE REVIEW
WoS CC Cited Count: 2
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Abstract :

Organic/inorganic hybrids suffer from low power factor (S-2 sigma) due to the anticorrelation between Seebeck coefficient (S) and electrical conductivity (sigma). Energy-filtering effect becomes a promising way to trade off S and sigma. Herein, we propose an effective method that constructs the heterogeneous interfaces containing the gradient potential barrier to greatly enhance the interfacial energy-filtering effect. Comparing with the conventional random and uniform configuration, the gradient potential barrier is capable of increasing but significantly suppressing the decrease in sigma, thereby improving S-2 sigma. The as-synthesized proof-of-concept PANI-(TiO2-CF) thermoelectric material that possesses the ternary interfaces with descending barrier enables a 4.8-fold increase in while just a 9.3-fold reduction in sigma, resulting in a 2.43-fold improvement in power factor, proving the conceptual feasibility. In addition, the synergetic phonon scattering at ternary interfaces conducts a quite low k of 0.226 W m(-1) K-1. It is found that the 20 % PANI-80 % (35 % TiO2-65 % CF) demonstrates the maximum power factor and figure of merit of 359.56 mu W m(-1) K-2 and 0.48 at room temperature, respectively. More importantly, the as-prepared PANI-(TiO2-CF) also illustrates the high flexibility together with the excellent chemical and physical durability. Moreover, a thermoelectric device that uses the PANI-(TiO2-CF) and PEI-doped MWCNT films as respectively p- and n-type components shows a maximum output power about 3.1 mu W at the temperature difference of 30 K. This work provides a unique interfacial methodology to reinforce the energy-filtering effect, suggesting great potential for boosting thermoelectric hybrids.

Keyword :

electrical conductivity energy-filtering effect heterogeneous interface Seebeck coefficient Thermoelectric thermoelectric hybrids

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GB/T 7714 Lin, Zizhen , Li, Yinshi , He, Ya-Ling . Retraction: Constructing interfacial potential barrier via a gradient configuration: an effective method to enhance energy-filtering effect [J]. | NATIONAL SCIENCE REVIEW , 2021 , 8 (3) .
MLA Lin, Zizhen et al. "Retraction: Constructing interfacial potential barrier via a gradient configuration: an effective method to enhance energy-filtering effect" . | NATIONAL SCIENCE REVIEW 8 . 3 (2021) .
APA Lin, Zizhen , Li, Yinshi , He, Ya-Ling . Retraction: Constructing interfacial potential barrier via a gradient configuration: an effective method to enhance energy-filtering effect . | NATIONAL SCIENCE REVIEW , 2021 , 8 (3) .
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Manipulating thermal conductivity of silicon nanowires through surrounded fins and Ge dopant EI SCIE
期刊论文 | 2021 , 176 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
WoS CC Cited Count: 1
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Manipulating the phonon transport using nanotechnologies is one of the commonly adopted ways to reduce the thermal conductivity and enhance the thermoelectric performance of thermoelectric materials. In this work, we proposed a resonant structure, surrounded fins, for Si nanowires. The effects of both surrounded fins and Ge dopant on the thermal transport in Si NWs are studied using the molecular dynamics simulations. The root-mean-square (RMS) displacement, phonon dispersion, density of states and transmission function have been calculated to understand the thermal conductivity reduction in Si NWs. The calculated results show that both the surrounded fins and Ge dopants could significantly decrease the thermal conductivity of Si NWs. The thermal conductivity of finned Si NWs decreases with increasing the height of the surrounded fins. The more surrounded fins added, the more significant the thermal conductivity decreases. The thermal conductivity of SiGe NWs decreases initially and then increases with increasing Ge concentration. Through the analysis of RMS displacement and phonon dispersion, we found that surround fins could not only enhance anharmonicity by activating atoms near to the edge, but also increase the low frequency phonons and decrease the group velocities by modifying phonon dispersion relationship. The phonon transmission function suggests that the surrounded fins and Ge dopants would mainly suppress the transport of low-frequency and high-frequency phonons, respectively. Phonon transport in Si NWs could be suppressed over the whole frequency range by combining the surrounded fins and Ge dopants. Our results provide useful guidance in the design of efficient thermoelectric devices made of nanowires. (C) 2021 Elsevier Ltd. All rights reserved.

Keyword :

Blocking phonon transport Ge dopant Resonant structures Si nanowire Thermoelectric devices

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GB/T 7714 Liang, Qi , He, Ya-Ling , Hung, Tzu-Chen . Manipulating thermal conductivity of silicon nanowires through surrounded fins and Ge dopant [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 176 .
MLA Liang, Qi et al. "Manipulating thermal conductivity of silicon nanowires through surrounded fins and Ge dopant" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 176 (2021) .
APA Liang, Qi , He, Ya-Ling , Hung, Tzu-Chen . Manipulating thermal conductivity of silicon nanowires through surrounded fins and Ge dopant . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 176 .
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