检索结果-南通市图书馆

Multiple Nanoparticles Coupling Strategy for Enhancing Optical Filter Performance of Spectral Splitter Used in Photovoltaic/Thermal System

引用

Journal of Thermal Science 2024年第1期33卷 368-382页

作者： LIANG Huaxu HUANG Xin wang fuqiang CHENG Ziming DONG Yan School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

Selective absorptive nanofluid can pre-absorb certain sunlight wavelength that cannot be used by PV and transmits remaining sunlight to the surface of PV,which can decouple PV from the thermal receiver spatially.In order to improve the harvesting of electricity and high-temperature thermal nanofluid,it is important to design an optimal optical filter window(transmit sunlight with wavelengths of 732-1067 nm to the surface of the photovoltaic cell and absorb the remaining sunlight).However,designing optimal optical filter is facing following challenges:(1) inherently narrow selective absorptivity property of single nanoparticle;(2) simplified numerical calculation method calculating transmittance;(3) ignoring the shape of the nanoparticle.In this study,the idea of using multiple nanoparticles coupling effect to design an optical filter is proposed,which can superimpose the narrow absorption bandwidth of different nanoparticles to obtain a wide absorption bandwidth of the whole system.In addition,an improved transmission method considering light-matter interaction at air/vessel and liquid/vessel interfaces is adopted to compute the transmittance.The results calculated by improved transmission method are more accurate than widely used traditional Lambert-Beer law,which is verified by experimental test.Furthermore,the effect of nanoparticle shape on spectral transmittance is also investigated,which shows that spiny Ag can approximately extend absorbance from 400 nm to 600 nm compared to nanosphere silver.Finally,the results show that optical filter efficiency of nanofluids with multiple nanoparticles coupling(Ag,spiny Ag,ZnO,ITO) can reached up to 35%.

关键词： solar energy PV/T nanofluid optimal optical filter radiative transfer spectral splitting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Performance of the Multilayer Film for Infrared Stealth based on VO2 Thermochromism

引用

Journal of Thermal Science 2024年第4期33卷 1312-1324页

作者： LI Yaru wang fuqiang ZHANG Aoyu FU Zhichang SU Ronghua GAO Tengfei wang Zhen GUO Jicheng ORDOS Institute of Technology School of New Energy Harbin Institute of Technology at Weihai School of Energy Science and Engineering Harbin Institute of Technology Defense Engineering Institute AMSPLA

With the development of detection and identification technology,infrared stealth is of great value to realize anti-reconnaissance detection of military targets.At present,infrared stealth materials generally have deficiency,such as complex structure,inconvenient radiation regulation and cumbersome preparation steps,which greatly limit the practical application of infrared stealth materials.In view of the above deficiency of infrared stealth materials,we proposed a kind of multilayer film for infrared stealth using VO2thermochromism based on the temperature response mechanism of tuna to adjust its color,and through the intelligent reversible radiation regulation mechanism to meet the infrared stealth requirements of tanks in different actual scenes.The results show that when the temperature increases from 300 K to 373 K,the peak emissivity of the film decreases from 94% to 20% in the 8-14 μm band after structural optimization,which can realize the infrared stealth of the high temperature target in the 8-14 μm band.The average emissivity of the multilayer film for infrared stealth at3-5μm and 8-14μm band can be reduced to 34% and 27% at 373 K,and the peak emissivity at 5-8 μm band can reach 65%,realizing dual-band infrared stealth in the 3-5 μm and 8-14 μm bands and heat dissipation in the 5-8μm band.The multilayer film for infrared stealth based on VO2thermochromism designed by the authors can meet the characteristics of simple film structure,convenient radiation regulation and simple preparation.

关键词： vanadium dioxide multilayer film infrared stealth thermal management

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Enzymatic self-assembly/disassembly turns “ON”/“OFF” the mimetic hydrolytic activity of histidine nanofibers

引用

Science China Chemistry 2024年第2期67卷 517-522页

作者： Xianbao Sun Manli wang Xiaoyang Liu Wenjun Zhan Guangqiong Xu Qiaochu Jiang Hai-Dong Xu fuqiang wang Gaolin Liang State Key Laboratory of Digital Medical Engineering School of Biological Science and Medical EngineeringSoutheast UniversityNanjing210096China Analysis Center Nanjing Medical UniversityNanjing210029China

Mimetic enzymes are devised as alternates or supplements of natural enzymes in broad fields but regulating their activities in a switchable manner remains challenging.Herein,we proposed an enzymatic self-assembly/disassembly strategy to address this issue.A peptide molecule Nap FFEYIH(YH) was rationally designed which,after self-assembling into nanofibers,lined up the histidine moieties to form active hydrolysis centers for mimicking hydrolase activity.Enzymatic dephosphorylation of Nap FFEYp IH(Yp H) by alkaline phosphatase to yield YH also turned “ON” the hydrolase activity.In turn,phosphorylation of YH by phosphokinase epidermal growth factor receptor to yield Yp H disassembled the nanofibers and thus turned the activity “OFF”.As such,the “ON”/“OFF” of the mimetic hydrolase activities could be regulated under physiological conditions through ALP/EGFR-mediated self-assembly/disassembly of histidine nanofibers.This work provides a feasible strategy for the on-demand fabrication of artificial enzymes with controllable and superior activities.

关键词： disassembly hydrolytic activity mimetic enzyme phosphorylation self-assembly

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of CoFe_(2)O_(4)-NiO nanoparticle-coated foam-structured material in a high-flux solar thermochemical reactor

引用

Science China(Technological Sciences) 2023年第11期66卷 3276-3286页

作者： ZHANG Hao ZHANG XiaoMi YANG DaZhi SHUAI Yong GUENE LOUGOU Bachirou PAN QingHui wang fuqiang School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China

The splitting of carbon dioxide through the two-step solar thermochemical cycle presents enormous potential,for it holds the dual functionalities of solar fuel production and carbon-based energy recovery.However,the industrialization of this technology is impeded by two critical factors:The absence of fully developed oxygen carriers and advanced reaction devices that deliver exceptional performance.In order to identify a potentially effective oxygen carrier,50 wt%NiO-modified Co Fe_(2)O_(4)is selected as the active component and characterized by means of thermogravimetry,scanning electron microscopy,and energy dispersive spectroscopy,so as to clarify its oxygen exchange capacity,micromorphology and elemental composition in high-temperature thermochemical cycles.Further,nanoparticle-coated foam-structured materials are prepared in combination with Si C ceramic foam for experimental testing in a high-flux solar reactor.The results indicate that a peak CO yield of 1.96 m L min^(-1)g^(-1)can be gained in a 1500–1250 K preliminary test,demonstrating the application potential of the material.In contrast to conventional redox materials,the CO_(2)activity of the materials synthesized in this study exhibits an enhancement with rising oxidation temperature.It means that isothermal cycles can potentially achieve higher conversion and fuel yield than non-isothermal cycles,while simultaneously reducing the amount of irreversible heat loss during high-temperature cycling.Although the estimated steadystate thermal efficiency of the solar reactor can reach up to 42%,further optimization of the reactor design is necessary to enhance energy conversion efficiency,as it is partially limited by the dimensions of the reaction chamber.

关键词： solar thermochemistry CO_(2)splitting two-step redox cycle iron-base oxygen carrier reactor design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical study on the thermal performance of packed-bed latent heat thermal energy storage system with biomimetic alveoli structure capsule

引用

Science China(Technological Sciences) 2021年第7期64卷 1544-1554页

作者： wang fuqiang DONG Yan LI Yang XU Jie ZHANG GuoLiang School of Physics Harbin Institute of TechnologyHarbin150001China School of New Energy Harbin Institute of TechnologyWeihai264209China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin150001China College of Petroleum Engineering Liaoning Shihua UniversityFushun113001China

Bionics provides a positive and beneficial impact on the development of various materials and systems, which has been widely used in energy storage, heat transfer enhancement, and solar thermochemical reactions. In this paper, the idea of heat storage unit with biomimetic alveoli structure is proposed and introduced to increase the heat transfer area and improve the thermal performance of the packed-bed latent heat thermal energy storage(LHTES) system. The effects of heat storage unit structure on temperature distribution, liquid fraction, thermal storage capacity, and other performance indexes of the conventional model and biomimetic model are analyzed. The numerical results indicate that the biomimetic alveoli structure can improve the thermal response of heat storage unit, increase the specific surface area, and achieve a faster heat storage process of the packed-bed compared with the conventional structure. Among various existing models, the double-cell model has a significant improvement.Compared with the conventional model, the maximum increase of liquid fraction and charging efficiency are 9.8% and 6.4%,respectively. This study can provide references to optimize packed-bed LHTES and improve its thermal performance under practical conditions.

关键词： solar energy thermal energy storage packed bed biomimetic alveoli phase change material

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of CoFeO-NiO nanoparticle-coated foam-structured material in a high-flux solar thermochemical reactor

引用

Science China Technological Sciences 2023年

作者： ZHANG Hao ZHANG XiaoMi YANG DaZhi SHUAI Yong GUENE LOUGOU Bachirou PAN QingHui wang fuqiang School of Energy Science and Engineering Harbin Institute of Technology School of New Energy Harbin Institute of Technology at Weihai School of Electrical Engineering and Automation Harbin Institute of Technology

The splitting of carbon dioxide through the two-step solar thermochemical cycle presents enormous potential, for it holds the dual functionalities of solar fuel production and carbon-based energy recovery. However, the industrialization of this technology is impeded by two critical factors: The absence of fully developed oxygen carriers and advanced reaction devices that deliver exceptional performance. In order to identify a potentially effective oxygen carrier, 50 wt% NiO-modified CoFe2O4is selected as the active component and characterized by means of thermogravimetry, scanning electron microscopy, and energy dispersive spectroscopy, so as to clarify its oxygen exchange capacity, micromorphology and elemental composition in high-temperature thermochemical cycles. Further, nanoparticle-coated foam-structured materials are prepared in combination with SiC ceramic foam for experimental testing in a high-flux solar reactor. The results indicate that a peak CO yield of 1.96 mL min-1g-1can be gained in a 1500–1250 K preliminary test, demonstrating the application potential of the material. In contrast to conventional redox materials, the CO2activity of the materials synthesized in this study exhibits an enhancement with rising oxidation temperature. It means that isothermal cycles can potentially achieve higher conversion and fuel yield than non-isothermal cycles, while simultaneously reducing the amount of irreversible heat loss during high-temperature cycling. Although the estimated steadystate thermal efficiency of the solar reactor can reach up to 42%, further optimization of the reactor design is necessary to enhance energy conversion efficiency, as it is partially limited by the dimensions of the reaction chamber.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Optical properties and cooling performance analyses of single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles

引用

Science China(Technological Sciences) 2021年第5期64卷 1017-1029页

作者： CHENG ZiMing SHUAI Yong GONG DaYang wang fuqiang LIANG HuaXu LI GuiQiang School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China Key Laboratory of Aerospace Thermophysics Ministry of Industry and Information TechnologyHarbin 150001China School of Engineering University of HullHull HU67RXUK

Radiative cooling can achieve cooling effect without consuming any energy by delivering energy into outer space(3K) through"atmospheric window"(8–13 μm). Conventional radiative cooling coating with multi-layer structure was severely restricted during application due to its complex preparation process and high cost. In this study, a single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles was proposed. The algorithm for calculating the radiative properties of the multi-particle system was developed. Monte Carlo ray-tracing method combined with that algorithm was used to solve the radiative transfer equation(RTE) of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles.The effects of particle diameter, volume fraction and coating thickness on radiative cooling performance were analyzed to obtain the best radiative cooling performance. The numerical results indicated that the average reflectivity of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles in the solar spectrum can reach 95.6%, while and the average emissivity in the "atmospheric window" spectrum can reach 94.9% without additional silver-reflectance layer. The average reflectivity in the solar spectrum and average emissivity in the "atmospheric window" spectrum of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles can increase 4.6% and 4.8% compared to the double-layer radiative cooling coating. This numerical research results can provide a theoretical guidance for design and optimization of single-layer radiative cooling coatings containing mixed nanoparticles.

关键词： radiative cooling optical property multi-particles cooling performance radiative transfer atmospheric window

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thermal Performance Analysis of PCM Capsules Packed-Bed System with Biomimetic Leaf Hierarchical Porous Structure

引用

Journal of Thermal Science 2021年第5期30卷 1559-1571页

作者： DONG Yan wang fuqiang YANG Luwei SHI Xuhang ZHANG Guoliang SHUAI Yong School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China

As an efficient natural selection nutrient transport system,biomimetic leaf hierarchical porous structure has unique advantages in material transportation and energy transfer.Biomimetic leaf hierarchical porous structure has been widely used in solar thermochemical reactions,photocatalysis,and energy storage.To improve the thermal efficiency and reduce the power consumption,the authors introduce the idea of bionic leaf hierarchical porous structure packed-bed latent heat thermal energy storage(LHTES)system.Under the same porosity,the diameter of the PCM capsules is designed to change along the flow direction to optimize the thermal performance.The effects of velocity on temperature distribution,pressure drop,liquid fraction,and thermal storage capacity of the conventional uniform model and bionic leaf hierarchical porous model are analyzed.The results show that the bionic leaf hierarchical porous structure can thin the thickness of the thermocline,reduce the pressure drop,increase the heat transfer area,and improve the thermal response of the packed-bed compared with the conventional uniform model.The maximum increases of liquid fraction and completion rate are 36.6%and 20.3%with pressure drop reduction of 25 Pa,respectively.The maximum decrease of the above-melting point(MP)thermocline is 51.7%as well.These results provide suggestions to optimize the packed-bed LHTES system and improve its thermal performance under practical conditions.

关键词： solar energy thermal energy storage packed bed biomimetic phase change hierarchical porous structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Double-directional control bolt support technology and engineering application at large span Y-type intersections in deep coal mines

引用

Mining Science and Technology 2010年第2期20卷 254-259页

作者： GUO, Zhibiao SHI, Jianjun wang, Jiong CAI, Feng wang, fuqiang state key laboratory of geomechanics and deep underground engineering beijing 100083china institute of geotechnical engineering china university of mining & technologybeijing 100083china safety engineering college north china university of science & technologybeijing 101601china

Under deep and complex geological conditions,severe deformation occurs at intersection points of Y-type roadways with large cross sections during engineering projects in coal mines,especially at junction arches.Based on in-situ investigations and theoretical studies,we have summarized typical forms of destruction and identified high stress and unrestricted support at both sides of junction arch as its main causes.In this study,we also presented double-directional control bolt support technology for a large Y-type span intersection,applied to deep intersection engineering in the Jiahe Coal Mine,which has proved effective.

关键词： Y-type intersection double-directional control bolt support deep coal mines

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

中国传统边疆文化中的“和合”思想及当代价值

引用

特区经济 2024年第3期 152-156页

作者：王富强中国人民警察大学河北廊坊065000

“和合”思想在中华民族传统文化中占据着重要地位,作为中华民族传统文化的一部分,身具多种特性的边疆文化也一直将“和合”思想作为自身文化基石。随着“人类命运共同体”、铸牢“中华民族共同体意识”的提出,面对机遇和挑战并存的局面... 详细信息

“和合”思想在中华民族传统文化中占据着重要地位,作为中华民族传统文化的一部分,身具多种特性的边疆文化也一直将“和合”思想作为自身文化基石。随着“人类命运共同体”、铸牢“中华民族共同体意识”的提出,面对机遇和挑战并存的局面,中国需要一种普遍熟知更为宏大的思想进行审视和分析,而“和合”思想就具备这一特质。因此,研究和弘扬边疆文化中的“和合”思想对于当代中国的发展有着重要的价值意义。

关键词：边疆文化 “和合”思想探析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：