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| 1 | A brief review of alternative propellants and requirements for pulsed plasma thrusters in micropropulsion applications显示文摘Technological miniaturization has enabled the development of small satellites weighing as little as 1 kg.Unfortunately,there is still a lack of suitable efficient micropropulsion systems at these scales.The pulsed plasma thruster is a structurally simple form of electric propulsion.This simplicity also makes it ideally suited for miniaturization.Its history can be traced back to applications in satellites that are much larger than micro/nano-satellites.The vast majority of modern pulsed plasma thrusters use solid polytetrafluoroethylene(PTFE)as a propellant.Unfortunately,at lower discharge energy levels such as those necessitated by the power limitations of micro/nano-satellites,PTFE has a tendency to exhibit carbon deposition,which can ultimately lead to thruster failure.In this new era of small satellites,it is important to consider alternative propellants in the miniaturization of pulsed plasma thrusters.This brief review discusses the needs and limitations of small satellites and alternative propellants that may be able to meet these needs.Such propellants may be able to offer advantages such as a longer thruster lifetime,a higher specific impulse,or a higher thrust-topower ratio.This would enable the development of different types of pulsed plasma thrusters that can be tailored towards specific mission requirements. | William Yeong Liang LING Song ZHANG Hao FU Mengcheng HUANG Justin QUANSAH Xiangyang LIU Ningfei WANG | 2020 | Chinese Journal of Aeronautics2020，33，12： | 3 |
| 2 | Different Ablation Models for the Wall-plasma Interaction Process in Pulsed Plasma Thruster显示文摘Ablation excited by current pulses is a very critical physical process in pulse plasma thrusters(PPT).Its effects on wall-plasma interaction directly determine the PPT performances.In order to reveal the process of the ablated wall interaction with the discharge plasma in PPT,ablation models formulated by three different boundary conditions at the wall-plasma interface are studied.These are the two widely used high-speed evaporation models(Model-L and Model-M),and the recently developed Keida-Zaghloul model(Model-K)of the Knudsen layer that takes into account the internal degrees of freedom on the energy flux conservation.First,fundamental mechanisms of the three ablation models are clarified by comparative analysis in order to gain a comprehensive understanding of the wall-plasma interaction.Then,the applicability of different ablation models with the numerical solutions of LES-6 PPT is investigated in detail using magnetohydrodynamic(MHD)modeling.Results show that Model-L and Model-M are actually special cases of Model-K when a simplified jump conditions limited by high velocity at the vapor/plasma interface is used;A ratio of ablation rate in Model-L to that in Model-M is about 0.8at the same wall surface temperature,while it rises to 1 at different surface temperature determined by Model-L and Model-M in PPT.Even though Model-K solution requires significant computational time,it shows more accurate ablation feature for the wall-plasma interaction and possesses better computing precision of impulse bit during post-pulse which is useful for future studies of the late time ablation. | YANG Lei LIU Xiangyang WANG Siyu XIE Kan WU Zhiwen WANG Ningfei | 2013 | 高电压技术2013，39，9： | 3 |
| 3 | Machine learning-based estimates of aboveground biomass of subalpine forests using Landsat 8 OLI and Sentinel-2B images in the Jiuzhaigou National Nature Reserve,Eastern Tibet Plateau显示文摘Accurate estimates of forest aboveground biomass(AGB)are critical for supporting strategies of ecosystem conservation and climate change mitigation.The Jiuzhaigou National Nature Reserve,located in Eastern Tibet Plateau,has rich forest resources on steep slopes and is very sensitive to climate change but plays an important role in the regulation of regional carbon cycles.However,an estimation of AGB of subalpine forests in the Nature Reserve has not been carried out and whether a global biomass model is available has not been determined.To provide this information,Landsat 8 OLI and Sentinel-2B data were combined to estimate subalpine forest AGB using linear regression,and two machine learning approaches–random forest and extreme gradient boosting,with 54 inventory plots.Regardless of forest type,Observed AGB of the Reserve varied from 61.7 to 475.1 Mg hawith an average of 180.6 Mg ha.Results indicate that integrating the Landsat 8 OLI and Sentinel-2B imagery significantly improved model efficiency regardless of modelling approaches.The results highlight a potential way to improve the prediction of forest AGB in mountainous regions.Modelled AGB indicated a strong spatial variability.However,the modelled biomass varied greatly with global biomass products,indicating that global biomass products should be evaluated in regional AGB estimates and more field observations are required,particularly for areas with complex terrain to improve model accuracy. | Ke Luo Yufeng Wei Jie Du Liang Liu Xinrui Luo Yuehong Shi Xiangjun Pei Ningfei Lei Ci Song Jingji Li Xiaolu Tang | 2022 | Journal of Forestry Research2022，33，4： | 2 |
| 4 | Hyaluronan synthase 3 expression promotes the growth of TSU prostate cancer cells显示文摘 | Liu Ningfei Gao Feng Han Zeqiu | 2001 | Cancer Res2001，61，13： | 1 |
| 5 | Hyaluronan synthase 3 expression promotes the growth of TSU prostate cancer cells显示文摘 | Liu Ningfei Gao Feng Han Zeqiu | 2001 | Cancer Res2001，61，13： | 1 |
| 6 | Anatomic and functional evaluation of the lymphatics and lymph nodes in diagnosis of lymphatic circulation disorders with contrast magneticresonance lymphangiography显示文摘 | LIU NINGFEI LIU LU QING JIANG ZHAOHUA | 2009 | Journal of Vascular Surgry2009，49，4： | 1 |
| 7 | A SARS-CoV-2 neutralizing antibody discovery by single cell sequencing and molecular modeling显示文摘Although vaccines have been developed,mutations of SARS-CoV-2,especially the dominant B.1.617.2(delta)and B.1.529(omicron)strains with more than 30 mutations on their spike protein,have caused a significant decline in prophylaxis,calling for the need for drug improvement.Antibodies are drugs preferentially used in infectious diseases and are easy to get from immunized organisms.The current study combined molecular modeling and single memory B cell sequencing to assess candidate sequences before experiments,providing a strategy for the fabrication of SARS-CoV-2 neutralizing antibodies.A total of 128 sequences were obtained after sequencing 196 memory B cells,and 42 sequences were left after merging extremely similar ones and discarding incomplete ones,followed by homology modeling of the antibody variable region.Thirteen candidate sequences were expressed,of which three were tested positive for receptor binding domain recognition but only one was confirmed as having broad neutralization against several SARS-CoV-2 variants.The current study successfully obtained a SARS-CoV-2 antibody with broad neutralizing abilities and provided a strategy for antibody development in emerging infectious diseases using single memory B cell BCR sequencing and computer assistance in antibody fabrication. | Zheyue Wang Qi Tang Bende Liu Wenqing Zhang Yufeng Chen Ningfei Ji Yan Peng Xiaohui Yang Daixun Cui Weiyu Kong Xiaojun Tang Tingting Yang Mingshun Zhang Xinxia Chang Jin Zhu Mao Huang Zhenqing Feng | 2023 | The Journal of Biomedical Research2023，37，3： | 0 |
| 8 | A SARS-CoV-2 neutralizing antibody discovery by single cell sequencing and molecular modeling显示文摘 | Zheyue Wang Qi Tang Bende Liu Wenqing Zhang Yufeng Chen Ningfei Ji Yan Peng Xiaohui Yang Daixun Cui Weiyu Kong Xiaojun Tang Tingting Yang Mingshun Zhang Xinxia Chang Jin Zhu Mao Huang Zhenqing Feng | 2023 | The Journal of Biomedical Research2023，37，3： | 0 |
| 9 | Selective growth of semiconducting single-walled carbon nanotubes solely from carbon monoxide显示文摘The selective growth of semiconducting single-walled carbon nanotubes(s-SWCNTs)is of great importance in many high-end applications represented by nanoelectronics.Here,we developed a general approach to grow horizontally aligned s-SWCNT arrays on stable temperature(ST)-cut quartz with bimetallic catalysts using carbon monoxide(CO)as both catalyst reductant and single component carbon feedstock under atmospheric pressure.The disproportionation of CO produces not only carbon species for SWCNT growth but also CO_(2),which could act as an in-situ etchant to remove both amorphous carbon and metallic tubes.The employment of bimetallic catalyst and quartz substrate facilitates the selective etching by narrowing the diameter distribution of as-grown SWCNT arrays.At the optimized conditions,we realized the selective growth of horizontally aligned s-SWCNT arrays with the content above 97%using CoCu catalysts,confirmed by Raman characterization and electrical measurements of the fabricated field effect transistor devices.This CO-based process in selective growth of s-SWCNTs has demonstrated its feasibility and universality by the broad growth window and applicability for other bimetallic catalysts,such as FeCu and CoMn.It possesses a practical potential in obtaining semiconducting channel materials for the scalable fabrication of CNT-based devices. | Xue Zhao Ningfei Gao Zeyao Zhang Qidong Liu Jian Sheng Yijie Hu Ruoming Li Haitao Xu Lianmao Peng Yan Li | 2023 | Nano Research2023，16，11： | 0 |
| 10 | Wafer-scale fabrication of carbon-nanotube-based CMOS transistors and circuits with high thermal stability显示文摘Thanks to its single-atomic-layer structure,high carrier transport,and low power dissipation,carbon nanotube electronics is a leading candidate towards beyond-silicon technologies.Its low temperature fabrication processes enable three-dimensional(3D)integration with logic and memory(static random access memory(SRAM),magnetic random access memory(MRAM),resistive random access memory(RRAM),etc.)to realize efficient near-memory computing.Importantly,carbon nanotube transistors require good thermal stability up to 400℃ processing temperature to be compatible with back-end-of-line(BEOL)process,which has not been previously addressed.In this work,we developed a robust wafer-scale process to build complementary carbon nanotube transistors with high thermal stability and good uniformity,where AlN was employed as electrostatic doping layer.The gate stack and passivation layer were optimized to realize high-quality interfaces.Specifically,we demonstrate 1-bit carbon nanotube full adders working under 250℃ with rail-to-rail outputs. | Nan Wei Ningfei Gao Haitao Xu Zhen Liu Lei Gao Haoxin Jiang Yu Tian Yufeng Chen Xiaodong Du Lian-Mao Peng | 2022 | Nano Research2022，15，11： | 0 |
| 11 | Therapeutic Efficacy of Complex Decongestive Therapy in the Treatment of Elephantiasis of the Lower Extremities显示文摘Objective To evaluate the therapeutic efficacy of complex decongestive therapy in the treatment of elephantiasis of the lower extremities.Methods Seventeen patients with unilateral lower limb elephantiasis were included in the study(5 with primary lymphedema and 12 with secondary lymphedema).All patients were treated with one course(4 weeks)of complex decongestive therapy.Changes inextracellular fluid(ECF),BMI,circumferences,and skin properties including skin stiffness(SF),percent water content(PWC),and trans-epidermal water loss(TEWL)were measured before and after treatment.Results The“elephantiasis-like”appearance of the affected limb was greatly improved after treatment.The ECF,BMI,and circumferences were significantly decreased after treatment(P<0.001)with an average ECF of 2.97±1.82 L,BMI of 1.638±2.647 kg/m^2,and circumference of 6.58±2.79 cm.The values of PWC,TEWL,and SFwere 50.5%±10.6%,18.55±10.2 g/m^2 h,and 0.161±0.176 N,respectively,before treatment and 36.05%±7%,8.3±2.07 g/m^2h,and 0.086±0.038 N,respectively,after treatment,there by showing significant decreases(P<0.05).Conclusion Complex decongestive therapy is effective in the treatment of advanced stages of chronic lymphedema. | Jiajia CHEN Li WANG Linghua HAN Ningfei LIU Ziyou YU | 2020 | Chinese Journal Of Plastic and Reconstructive Surgery2020，2，1： | 0 |
| 12 | Micro-aluminum powder with bi-or tri-component alloy coating as a promising catalyst:Boosting pyrolysis and combustion of ammonium perchlorate显示文摘A novel design of micro-aluminum(μAl)powder coated with bi-/tri-component alloy layer,such as:Ni-P and Ni-P-Cu(namely,Al@Ni-P,Al@Ni-P-Cu,respectively),as combustion catalysts,were introduced to release its huge energy inside Al-core and promote rapid pyrolysis of ammonium perchlorate(AP)at a lower temperature in aluminized propellants.The microstructure of Al@Ni-P-Cu demonstrates that a three-layer Ni-P-Cu shell,with the thickness of~100 nm,is uniformly supported byμAl carrier(fuel unit),which has an amorphous surface with a thickness of~2.3 nm(catalytic unit).The peak temperature of AP with the addition of Al@Ni-P-Cu(3.5%)could significantly drop to 316.2℃ at high-temperature thermal decomposition,reduced by 124.3℃,in comparison to that of pure AP with 440.5℃.It illustrated that the introduction of Al@Ni-P-Cu could weaken or even eliminate the obstacle of AP pyrolysis due to its reduction of activation energy with 118.28 kJ/mol.The laser ignition results showed that the ignition delay time of Al@Ni-P-Cu/AP mixture with 78 ms in air is shorter than that of Al@Ni-P/AP(118 ms),decreased by 33.90%.Those astonishing breakthroughs were attributed to the synergistic effects of adequate active sites on amorphous surface and oxidation exothermic reactions(7597.7 J/g)of Al@Ni-P-Cu,resulting in accelerated mass and/or heat transfer rate to catalyze AP pyrolysis and combustion.Moreover,it is believed to provide an alternative Al-based combustion catalyst for propellant designer,to promote the development the propellants toward a higher energy. | Chao Wang Ying Liu Mingze Wu Jia Li Ying Feng Xianjin Ning Hong Li Ningfei Wang Baolu Shi | 2024 | Defence Technology(防务技术)2024，33，3： | 0 |
| 13 | Achieving high-strain-rate and low-temperature superplasticity in an ECAP-processed Mg-Y-Er-Zn alloy via Ag addition显示文摘The effect of adding a small amount of Ag on the microstructure evolution and superplastic properties of Mg-Y-Er-Zn(WEZ612) alloys was systematically studied.The basal texture of the refined WEZ612 alloy produced by equal channel angular pressing was altered to a non-basal structure upon the addition of Ag.Ag addition also refined the grain size and promoted the formation of a large number of nano-14H-long period stacking ordered phases.Using high-resolution transmission electron microscopy,many nano-precipitated phases were detected on the basal plane of the Mg-Y-Er-Zn-1Ag(WEZ612-1Ag) alloy,The nano-precipitated phases on the basal plane improved the thermal stability of the alloy,lowered the deformation activation energy(Q),and improved the stress sensitivity index(m).At 523 K with a strain rate of 10^(-2) s^(-1),the Q value of WEZ612 was higher than that of WEZ612-1Ag(299.14 and 128.5 kJ mol^(-1),respectively).In contrast,the m value of the WEZ612 alloy(0.16) was lower than that of the WEZ612-1Ag alloy(0.46).At 623 K with a tensile rate of 10^(-2) s^(-1),the WEZ612 and WEZ612-1Ag alloys were elongated by 182% and 495%,respectively,with the latter exhibiting high-strain-rate and low-temperature superplasticity.The improved superplasticity of the WEZ612-1Ag alloy is attributed to the nano-precipitated phases,which effectively limit the cavity extension during superplastic deformation. | Haoran Wu Jinghua Jiang Zhenquan Yang Mengjia Li He Huang Ningfei Ge Aibin Ma Huan Liu | 2023 | Journal of Magnesium and Alloys2023，11，10： | 0 |
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