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| 1 | World’s first spaceflight on-orbit demonstration of a flexible solar array system based on shape memory polymer composites显示文摘With a 10%reversible compressive strain in more than 10 deformation cycles,the shape memory polymer composites(SMPCs)could be used for deployable structure and releasing mechanism.In this paper,without traditional electro-explosive devices or motors/controllers,the deployable SMPC flexible solar array system(SMPC-FSAS)is studied,developed,ground-based tested,and finally on-orbit validated.The epoxy-based SMPC is used for the rolling-out variable-stiffness beams as a structural frame as well as an actuator for the flexible blanket solar array.The releasing mechanism is primarily made of the cyanate-based SMPC,which has a high locking stiffness to withstand 50 g gravitational acceleration and a large unlocking displacement of 10 mm.The systematical mechanical and thermal qualification tests of the SMPC-FSAS flight hardware were performed,including sinusoidal sweeping vibration,shocking,acceleration,thermal equilibrium,thermal vacuum cycling,and thermal cycling test.The locking function of the SMPC releasing mechanisms was in normal when launching aboard the SJ20 Geostationary Satellite on 27 Dec.,2019.The SMPC-FSAS flight hardware successfully unlocked and deployed on 5 Jan.,2020 on geostationary orbit.The triggering signal of limit switches returned to ground at the 139 s upon heating,which indicated the successful unlocking function of SMPC releasing mechanisms.A pair of epoxy-based SMPC rolled variable-stiffness tubes,which clapped the flexible blanket solar array,slowly deployed and finally approached an approximate 100%shape recovery ratio within 60 s upon heating.The study and on-orbit successful validation of the SMPC-FSAS flight hardware could accelerate the related study and associated productions to be used for the next-generation releasing mechanisms as well as space deployable structures,such as new releasing mechanisms with low-shocking,testability and reusability,and ultra-large space deployable solar arrays. | LAN Xin LIU LiWu ZHANG FengHua LIU ZhengXian WANG LinLin LI QiFeng PENG Fan HAO SiDa DAI WenXu WAN Xue TANG Yong WANG Mian HAO YanYan YANG Yang YANG Cheng LIU YanJu LENG JinSong | 2020 | Science China(Technological Sciences)2020，63，8： | 7 |
| 2 | Recent Advances in Space-Deployable Structures in China显示文摘Deployable space structure technology is an approach used in building spacecraft,especially when realizing deployment and folding functions.Once in orbit,the structures are released from the fairing,deployed,and positioned.With the development of communication,remote-sensing,and navigation satellites,space-deployable structures have become cutting-edge research topics in space science and technology.This paper summarizes the current research status and development trend of spacedeployable structures in China,including large space mesh antennas,space solar arrays,and deployable structures and mechanisms for deep-space exploration.Critical technologies of space-deployable structures are addressed from the perspectives of deployable mechanisms,cable-membrane form-finding,dynamic analysis,reliable environmental adaptability analysis,and validation.Finally,future technology developments and trends are elucidated in the fields of mesh antennas,solar arrays,deployable mechanisms,and on-orbit adjustment,assembly,and construction. | Xiaofei Ma Tuanjie Li Jingya Ma Zhiyi Wang Chuang Shi Shikun Zheng Qifeng Cui Xiao Li Fan Liu Hongwei Guo Liwu Liu Zuowei Wang Yang Li | 2022 | Engineering2022，，10： | 6 |
| 3 | Low power 3.1–10.6 GHz IR-UWB transmitter for Gbps wireless communications显示文摘This paper reviews and discusses the design of a low-power single-full-band (3.1-10.6 GHz) non- carrier impulse-radio ultra wideband (UWB) transmitter featuring 5th-order Gaussian derivative pulse shaping, integrated BPSK modulation, and 2.5 kV whole-chip ESD (electrostatic discharge) protection. The UWB transmitter design has been implemented in a commercial 0.18 μm CMOS technology with a very small die size of 0.25 mm2. The fabricated chips have demonstrated full functionality, extremely low power consumption of 0.14 pJ/p-mV, and an ultra short pulse width of 394 ps. This ESD-protected UWB transmitter has the potential to support wireless streaming to gigabit per second (Gbps). | WANG Xin LIN Lin TANG He ZHAO Hui FANG Qiang LIU Jian FAN SiQiang WANG Albert ZHAO Bin YANG LiWu ZHANG Gary | 2011 | Science China(Information Sciences)2011，54，5： | 2 |
| 4 | Temperature-Dependent Rheological Behaviors of Binary Eutectic Mixtures of Sugar Alcohols for Latent Heat Storage:A Comparative Study with Pure Sugar Alcohols显示文摘The temperature-dependent rheological behaviors of five selected binary eutectic mixture sugar alcohols,with great potential for latent heat storage in the range of 353.15 K to 523.15 K,were investigated.It was found that the rheological behaviors of the mixture sugar alcohols depend on those of the pure compounds as well as their molar ratios.The two mixtures of xylitol(75 mol%)+erythritol and erythritol(84 mol%)+d-mannitol behave like pseudoplastic fluids with typical non-Newtonian shear-thinning behaviors,as indicated by the power law index of 0.99(<1).The mixture of d-mannitol(70 mol%)+d-dulcitol is a nonlinear Bingham fluid,exhibiting a slight yield stress(0.001 Pa to 0.01 Pa)at low shear rates.The rest two mixtures containing the cyclic-structured inositol behave like Herschel-Bulkley fluids.The infinite shear viscosities of the eutectic mixtures over the entire temperature range appear to be higher than those of their respective pure compounds,except for inositol.The mixture of xylitol(75 mol%)+erythritol at its melting point shows higher dynamic viscosity of about 0.546 Pa·s than the values of about 0.396 Pa·s and 0.035 Pa·s for xylitol and erythritol,respectively.In addition,the activation energies of viscous flow of the mixtures,as determined by fitting the dynamic viscosity-temperature curves using the Arrhenius model,also exhibit higher values than those of their pure compounds.The activation energy of viscous flow of the mixture xylitol(75 mol%)+erythritol was determined to be about 92400 J/mol in the supercooled liquid state,while the supercooled liquid xylitol and erythritol have much lower values of 83500 J/mol and 51900 J/mol,respectively.Both the increased dynamic viscosities and activation energies of viscous flow can result in deteriorated crystallization performance during latent heat retrieval. | SHAO Xuefeng YANG Sheng CHEN Chenlin FAN Liwu YU Zitao | 2021 | Journal of Thermal Science2021，30，6： | 1 |
| 5 | Free fatty acids are responsible for the hidden blood loss in total hip and knee arthroplasty显示文摘 | Nirong Bao Liwu Zhou Yu Cong Ting Guo Wenbin Fan Zhiyong Chang Jianning Zhao | 2013 | Medical Hypotheses2013，，1： | 1 |
| 6 | Effects of various carbon nanofillers on the thermal conductivity and energy storage properties of paraffin-based nano- composite phase change materials显示文摘 | FAN Liwu FANG Xin WANG Xiao | 2013 | Applied Energy2013，110，： | 1 |
| 7 | A numerical study of laminar natural convective heat transfer around a horizontal cylinder inside a concentric air-filled triangular enclosure显示文摘 | Xu Xu Zitao Yu Yacai Hu Liwu Fan Kefa Cen | 2009 | International Journal of Heat and Mass Transfer2009，，1： | 1 |
| 8 | An indoor experimtntal investigation of the thermal performance of a TPLT-based natural circulation steam generator as applied to PTC systems显示文摘 | Liang zhang Liwu Fan | 2014 | Applied thermal Engineering 622014，，： | 1 |
| 9 | Free fatty acids are responsible for the hidden blood loss in total hip and knee arthroplasty显示文摘 | Nirong Bao Liwu Zhou Yu Cong Ting Guo Wenbin Fan Zhiyong Chang Jianning Zhao | 2013 | Medical Hypotheses2013，，1： | 1 |
| 10 | Regulated Tran- sient Pool Boiling of Water During Quenching on Nanos- tructured Surfaces With Modified W'ettability from Super- hydrophilic to Superhydrophobic 显示文摘 | FAN Liwu LI Jiaqi LI Danyang | 2014 | International Jour- hal of Heat and Mass Transfer2014，76，： | 1 |
| 11 | Thermal conductivity enhancement of nanostructure-based colloidal suspensions utilized as phase change materials for thermal energy storage: A review显示文摘 | J.M. Khodadadi Liwu Fan Hasan Babaei | 2013 | Renewable and Sustainable Energy Reviews2013，，： | 1 |
| 12 | Anexperimental investigation of the heat losses of a U-typesolar heat pipe receiver of a parabolic trough collector-based natural circulation steam generation system 显示文摘 | Zhang Liang Yu Zitao Fan Liwu el at | 2013 | Renewable Energy2013，57，： | 1 |
| 13 | Surface Structure and Catalyric Performance of Supported PtSn Catalysts 显示文摘 | Yang Weisheng Lin Liwu Fan Yining | 1992 | Catal Lett1992，12，13： | 1 |
| 14 | Thermal conductivity enhancement of phase change materials for thermal energy storage: A review显示文摘 | Liwu Fan J.M. Khodadadi | 2010 | Renewable and Sustainable Energy Reviews2010，，1： | 1 |
| 15 | Effects of various carbon nanofillers on the thermal conductivity and energy storage properties of paraffin-based nanocomposite phase change materials 显示文摘 | FAN Liwu FANG Xin WANG Xiao | 2013 | Applied Energy2013，110，： | 1 |
| 16 | Experimental Investigation of Heat Storage and Heat Transfer Rates during Melting of Nano-Enhanced Phase Change Materials (NePCM) in a Differentially-Heated Rectangular Cavity显示文摘In this work, an experimental study of melting heat transfer of nano-enhanced phase change materials(NePCM) in a differentially-heated rectangular cavity was performed. Two height-to-width aspect ratios of the cavity, i.e., 0.9 and 1.5, were investigated. The model Ne PCM samples were prepared by dispersing graphene nanoplatelets(GNP) into 1-tetradecanol, having a nominal melting point of 37℃, at loadings up to 3 wt.%. The viscosity was found to have a more than 10-fold increase at the highest loading of GNP. During the melting experiments, the wall superheat at the heating boundary was set to be 10℃ or 30℃. It was shown that with increasing the loading of GNP, both the heat storage and heat transfer rates during melting decelerate to some extent, at all geometrical and thermal configurations. This suggested that the use of NePCM in such cavity may not be able to enhance the heat storage rate due to the dramatic growth in viscosity, which deteriorates significantly natural convective heat transfer during melting to overweigh the enhanced heat conduction by only a decent increase in thermal conductivity. This also suggested that the numerically predicted melting accelerations and heat transfer enhancements, as a result of the increased thermal conductivity, in the literature are likely overestimated because the negative effects due to viscosity growth are underestimated. | LI Zirui HU Nan TU Jing FAN Liwu | 2020 | Journal of Thermal Science2020，29，2： | 0 |
| 17 | Co-design of ESD protection and UWB RF front-end ICs显示文摘This paper discusses critical aspects for co-design of ultra wideband (UWB) system-on-chip (SoC) and on-chip electrostatic discharge (ESD) protection,which are beyond the considerations on data rate and bandwidth.Impulse radio UWB system architecture has been defined with critical building blocks proposed and verified,including pulse generator,transmitter,low noise amplifier (LNA) and multiplier based correlator.ESD protection is well considered for each related block.Design examples have been implemented in a commercial RFCMOS processes to demonstrate the working principles for key UWB transmitter and receiver circuit blocks.UWB-ESD co-design techniques,simulation and measurement results for these UWB RF modules are presented in detail. | WANG Xin TANG He LIN Lin LIU Jian FANG Qiang ZHAO Hui WANG Albert SHI ZiTao FAN SiQiang ZHAO Bin YANG LiWu HE Jun CHENG YuHua | 2011 | Science China(Information Sciences)2011，54，10： | 0 |
| 18 | Effects of Diesel Concentration on the Thermal Conductivity,Specific Heat Capacity and Thermal Diffusivity of Diesel-Contaminated Soil显示文摘High energy consumption is a serious issue associated with in situ thermal desorption(TD)remediation of sites contaminated by petroleum hydrocarbons(PHs).The knowledge on the thermophysical properties of contaminated soil can help predict accurately the transient temperature distribution in a remediation site,for the purpose of energy conservation.However,such data are rarely reported for PH-contaminated soil.In this study,by taking diesel as a representative example for PHs,soil samples with constant dry bulk density but different diesel mass concentrations ranging from 0% to 20% were prepared,and the variations of their thermal conductivity,specific heat capacity and thermal diffusivity were measured and analyzed over a wide temperature range between 0℃ and 120℃.It was found that the effect of diesel concentration on the thermal conductivity of soil is negligible when it is below 1%.When diesel concentration is below 10%,the thermal conductivity of soil increases with raising the temperature.However,when diesel concentration becomes above 10%,the change of the thermal conductivity of soil with temperature exhibits the opposite trend.This is mainly due to the competition between soil minerals and diesel,because the thermal conductivity of minerals increases with temperature,whereas the thermal conductivity of diesel decreases with temperature.The analysis results showed that,compared with temperature,the diesel concentration has more significant effects on soil thermal conductivity.Regardless of the diesel concentration,with the increase of temperature,the specific heat capacity of soil increases,while the thermal diffusivity of soil decreases.In addition,the results of a control experiment exhibited that the relative differences of the thermal conductivity of the soil samples containing the same concentration of both diesel and a pure alkane are all below 10%,indicating that the results obtained with diesel in this study can be extended to the family of PHs.A theoretical prediction model was proposed based on cubic fractal and thermal resistance analysis,which confirmed that diesel concentration does have a significant effect on soil thermal conductivity.For the sake of practical applications,a regression model with the diesel concentration as a primary parameter was also proposed. | WU Yuhao WU Yuefei LUO Gubai ZHANG Teng WANG Qing FAN Liwu SONG Xin YU Zitao | 2024 | Journal of Thermal Science2024，33，2： | 0 |
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