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| 1 | Multifunctional SiC@SiO_(2) Nanofiber Aerogel with Ultrabroadband Electromagnetic Wave Absorption显示文摘Traditional ceramic materials are generally brittle and not flexible with high production costs,which seriously hinders their practical applications.Multifunctional nanofiber ceramic aerogels are highly desirable for applications in extreme environments,however,the integration of multiple functions in their preparation is extremely challenging.To tackle these challenges,we fabricated a multifunctional SiC@SiO_(2) nanofiber aerogel(SiC@SiO_(2) NFA)with a threedimensional(3D)porous cross-linked structure through a simple chemical vapor deposition method and subsequent heat-treatment process.The as-prepared SiC@SiO_(2) NFA exhibits an ultralow density(~11 mg cm^(-3)),ultra-elastic,fatigue-resistant and refractory performance,high temperature thermal stability,thermal insulation properties,and significant strain-dependent piezoresistive sensing behavior.Furthermore,the SiC@SiO_(2) NFA shows a superior electromagnetic wave absorption performance with a minimum refection loss(RL_(min))value of-50.36 d B and a maximum effective absorption bandwidth(EAB_(max))of 8.6 GHz.The successful preparation of this multifunctional aerogel material provides a promising prospect for the design and fabrication of the cutting-edge ceramic materials. | Limeng Song Fan Zhang Yongqiang Chen Li Guan Yanqiu Zhu Mao Chen Hailong Wang Budi Riza Putra Rui Zhang Bingbing Fan | 2022 | Nano-Micro Letters2022，14，9： | 4 |
| 2 | Enhanced photoresponse of Ti0_(2)/MoS_(2)heterostructure phototransistors by the coupling of interface charge transfer and photogating显示文摘Two-dimensional(2D)MoS_(2)with appealing physical properties is a promising candidate for next-generation electronic and optoelectronic devices,where the ultrathin MoS_(2)is usually laid on or gated by a dielectric oxide layer.The oxide/MoS_(2)interfaces widely existing in these devices have significant impacts on the carrier transport of the MoS_(2)channel by diverse interface interactions.Artificial design of the oxide/MoS_(2)interfaces would provide an effective way to break through the performance limit of the 2D devices but has yet been well explored.Here,we report a high-performance MoS_(2)-based phototransistor with an enhanced photoresponse by interfacing few-layer MoS_(2)with an ultrathin Ti0_(2)layer.The Ti0_(2)is deposited on MoS_(2)through the oxidation of an e-beam-evaporated ultrathin Ti layer.Upon a visible-light illumination,the fabricated Ti0_(2)/MoS_(2)phototransistor exhibits a responsivity of up to 2,199 A/W at a gate voltage of 60 V and a detectivity of up to 1.67×10^(13)Jones at a zero-gate voltage under a power density of 23.2μW/mm^(2).These values are 4.0 and 4.2 times those of the pure MoS_(2)phototransistor.The significantly enhanced photoresponse of Ti0_(2)/MoS_(2)device can be attributed to both interface charge transfer and photogating effects.Our results not only provide valuable insights into the interactions at Ti0_(2)/MoS_(2)interface,but also may inspire new approach to develop other novel optoelectronic devices based on 2D layered materials. | Bingxu Liu Yinghui Sun Yonghuang Wu Kai Liu Huanyu Ye Fangtao Li Limeng Zhang Yong Jiang Rongming Wang | 2021 | Nano Research2021，14，4： | 4 |
| 3 | Transformation of Laves phases and its effect on the mechanical properties of TIG welded Mg-Al-Ca-Mn alloys显示文摘The effects of Al content and Ca/Al mass ratio on the microstructure and mechanical properties of tungsten inert gas(TIG)welded Mg-2Ca-x Al-0.5Mn(x=0,1,5)alloy joints were studied in present work.Results showed that increasing Al content was effective in reducing the dendrite spacing at the fusion zone(FZ)edge.The Laves phases in the FZ and the heat-affected zone(HAZ)can be changed from Mg_(2)Ca to(Mg,Al)_(2)Ca with the decrease of Ca/Al ratio,and the(Mg,Al)_(2)Ca could be further transformed to Al_(2)Ca under welding thermal cycle.Furthermore,dynamic dissolution and precipitation of Laves phases and Al_(8)Mn_(5)phases occurred in the HAZ,resulting in a gradient microstructure and hardness peak in this area.The tensile properties of the joints were significantly improved with the increase of Al content,which was mainly due to the modification of Laves phases. | Sensen Chai Shiyu Zhong Qingshan Yang Daliang Yu Qingwei Dai Hehe Zhang Limeng Yin Gang Wang Zongxiang Yao | 2022 | Journal of Materials Science & Technology2022，，25： | 2 |
| 4 | Body Waves Revealed by Spatial Stacking on Long-Term Cross-Correlation of Ambient Noise显示文摘Theoretical and experimental studies indicate that complete Green's Function can be retrieved from cross-correlation in a diffuse field. High SNR(signal-to-noise ratio) surface waves have been extracted from cross-correlations of long-duration ambient noise across the globe. Body waves, not extracted in most of ambient noise studies, are thought to be more difficult to retrieve from regular ambient noise data processing. By stacking cross-correlations of ambient noise in 50 km inter-station distance bins in China, western United States and Europe, we observed coherent 20–100 s core phases(Sc S, PKIKPPKIKP, PcP PKPPKP) and crustal-mantle phases(Pn, P, PL, Sn, S, SPL, SnS n, SS, SSPL) at distances ranging from 0 to 4 000 km. Our results show that these crustal-mantle phases show diverse characteristics due to different substructure and sources of body waves beneath different regions while the core phases are relatively robust and can be retrieved as long as stations are available. Further analysis indicates that the SNR of these body-wave phases depends on a compromise between stacking fold in spatial domain and the coherence of pre-stacked cross-correlations. Spatially stacked cross-correlations of seismic noise can provide new virtual seismograms for paths that complement earthquake data and that contain valuable information on the structure of the Earth. The extracted crustal-mantle phases can be used to study lithospheric heterogeneities and the robust core phases are significantly useful to study the deep structure of the Earth, such as detecting fine heterogeneities of the core-mantle boundary and constraining differential rotation of the inner core. | Kai Wang Yinhe Luo Kaifeng Zhao Limeng Zhang | 2014 | Journal of Earth Science2014，25，6： | 1 |
| 5 | A Track-type Inverted Climbing Robot with Bio-inspired Spiny Grippers显示文摘To enable the capacity of climbing robots to work on steep surfaces,especially on inverted surfaces,is a fundamental but challenging task.This capacity can extend the reachable workspace and applications of climbing robots.A track-type inverted climbing robot called SpinyCrawler was developed in this paper.Using a spiny track with an opposed gripping mechanism,the robot was experimentally demonstrated to have the ability of generating considerable adhesion to achieve stable inverted climbing.First,to guarantee reliable attachment of the robot on rough ceilings,a spiny gripper inspired by the opposed gripping prolegs of caterpillars is designed,and a gripping model of the interaction between spines and the ceiling asperities is established and analyzed.Second,a spiny track is developed by assembling dozens of spiny grippers to enable continuous attachment.A cam mechanism is introduced in the robot design without extra actuators to achieve stable attachment and easy detachment during continuous climbing.Finally,climbing experiments are conducted on different surfaces,using a SpinyCrawler prototype.Experimental results demonstrated stable climbing ability on various rough inverted and vertical surfaces,including concrete walls,crushed stone walls,sandpaper walls,brick walls,and brick ceilings. | Yanwei Liu Limeng Wang Fuzhou Niu Pengyang Li Yan Li Tao Mei | 2020 | Journal of Bionic Engineering2020，17，5： | 1 |
| 6 | Probabilistic Optimal Power Flow of an AC/DC System with a Multiport Current Flow Controller显示文摘To evaluate the impact of the randomness and correlation of photovoltaic(PV)and load on AC/DC systems with a multiport current flow controller(M-CFC),this paper proposes a probabilistic optimal power flow calculation for AC/DC systems,based on a nonparametric kernel density estimation.First,according to the M-CFC model,the DC power flow calculation method with M-CFC was inferred,and its influence on line loss was analyzed.Second,a nonparametric kernel density estimation with an adaptive bandwidth is used to accurately describe the probability distribution of the PV and load,and correlation samples of the PV and load are obtained by the mixed copula function.Then an optimization model that considers system loss and static security is established,and a fast nondominated sorting genetic algorithm based on the elite strategy(NSGA-II)is used to calculate the multi-objective probability optimal power flow of the AC/DC system.Finally,a case study is performed on a modified IEEE39 bus system using measured PV and load data.We verified that the nonparametric kernel density estimation with an adaptive bandwidth can better adapt to random component uncertainty,and M-CFC can improve the static security of the system. | Jing Bian He Wang Limeng Wang Guoqing Li Zhenhao Wang | 2021 | CSEE Journal of Power and Energy Systems2021，7，4： | 0 |
| 7 | Loess in China: A Good Archive of Climatic and Environmental Changes during the Quaternary显示文摘Quaternary scientists in China have significantly improved our knowledge of loess deposition as well as our understanding of paleoclimatic and paleoen- vironmental changes over the past 2.5 million years. It is recognized that loess is of aeolian origin with loess forming dust continuously deposited. It is also believed that grain-size, magnetic suscepti- bility, carbon isotopes and fossil assemblages in loess deposits are good proxy indicators of pale- omonsoon climate and paleovegetation changes over the past 2. 5 million years. Chinese loess is regard- ed as one of the best terrestrial archives of climatic and environmental changes during the Quaternary. Further investigation of loess deposits and their records of climatic and environmental change aids understanding of climate change and gives scientific backing for the project of ecological and environ- mental restoration in northwest China . | Wang Limeng Lu Huayu | 2005 | Science Foundation in China2005，13，1： | 0 |
| 8 | Inhibition of USP7 suppresses advanced glycation end-induced cell cycle arrest and senescence of human umbilical vein endothelial cells through ubiquitination of p53显示文摘Diabetes mellitus is a n arising public health concern,and diabetic foot is one of the most common complications of diabetes.Current management for diabetic foot cannot reach optimal remission.In this study,we aim to explore the mechanism underlying the pathogenesis of diabetic foot and provide novel strategies for the treatment of diabetic foot.A total of 10 normal skin tissues and 20 diabetic foot ulcer specimens are collected.Cell proliferation is determined by CCK-8 assay.Cell cycle is determined by flow cytometry,and cell senescence is evaluated by 0-galactosidase staining.Co-immunoprecipitation assay is used to explore the interaction between USP7 and p53.Advanced glycation end products(AGEs)are used to establish diabetic cell model,and streptozotocin(STZ)is used to establish diabetic rat model.Our results showed that USP7 expression is increased in diabetic.foot ulcer and in human umbilical vein endothelial cells(HUVECs)after treatment with AGEs.Inhibition of USP7 can reduce cell cycle arrest and cell senescence in HUVECs.Moreover,USP7 can interact with p53 and promote its expression through mediating its deubiquitination.Knockdown of p53 can reverse USP7-mediated cell cycle arrest and cell senescence in HUVECs.In diabetic rats,HBX 41108,the specific inhibitor of USP7,can significantly accelerate wound healing.Our study reveals that the inhibition of USP7 can suppress AGEs-induced cell cycle arrest and cell senescence of HUVECs through promoting p53 ubiquitination.USP7 is a potential target for the treatment of diabetic foot ulcers. | Xu Li Tao Wang Yue Tao Xiaojun Wang Limeng Li Jianjun Liu | 2022 | Acta Biochimica et Biophysica Sinica2022，54，3： | 0 |
| 9 | Engineering Strategies for Suppressing the Shuttle Effect in Lithium–Sulfur Batteries显示文摘Lithium–sulfur(Li–S)batteries are supposed to be one of the most potential next-generation batteries owing to their high theoretical capacity and low cost.Nevertheless,the shuttle effect of firm multi-step two-electron reaction between sulfur and lithium in liquid electrolyte makes the capacity much smaller than the theoretical value.Many methods were proposed for inhibiting the shuttle effect of polysulfide,improving corresponding redox kinetics and enhancing the integral performance of Li–S batteries.Here,we will comprehensively and systematically summarize the strategies for inhibiting the shuttle effect from all components of Li–S batteries.First,the electrochemical principles/mechanism and origin of the shuttle effect are described in detail.Moreover,the efficient strategies,including boosting the sulfur conversion rate of sulfur,confining sulfur or lithium polysulfides(LPS)within cathode host,confining LPS in the shield layer,and preventing LPS from contacting the anode,will be discussed to suppress the shuttle effect.Then,recent advances in inhibition of shuttle effect in cathode,electrolyte,separator,and anode with the aforementioned strategies have been summarized to direct the further design of efficient materials for Li–S batteries.Finally,we present prospects for inhibition of the LPS shuttle and potential development directions in Li–S batteries. | Jiayi Li Li Gao Fengying Pan Cheng Gong Limeng Sun Hong Gao Jinqiang Zhang Yufei Zhao Guoxiu Wang Hao Liu | 2024 | Nano-Micro Letters2024，16，1： | 0 |
| 10 | Ultralight and hyperelastic SiC nanofiber aerogel spring for personal thermal energy regulation显示文摘Multifunctionalization is the development direction of personal thermal energy regulation equipment in the future.However,it is still a huge challenge to effectively integrate multiple functionalities into one material.In this study,a simple thermochemical process was used to prepare a multifunctional SiC nanofiber aerogel spring(SiC NFAS),which exhibited ultralow density(9 mg/cm3),ultralow thermal conductivity(0.029 W/(m·K)at 20℃),excellent ablation and oxidation resistance,and a stable three-dimensional(3D)structure that composed of a large number of interlacing 3C-SiC nanofibers with diameters of 300–500 nm and lengths in tens to hundreds of microns.Furthermore,the as-prepared SiC NFAS displayed excellent mechanical properties,with a permanent deformation of only 1.3%at 20℃after 1000 cycles.Remarkably,the SiC NFAS exhibited robust hyperelasticity and cyclic fatigue resistance at both low(~-196℃)and high(~700℃)temperatures.Due to its exceptional thermal insulation performance,the SiC NFAS can be used for personal thermal energy regulation.The results of the study conclusively show that the SiC NFAS is a multifunctional material and has potential insulation applications in both low-and high-temperature environments. | Limeng SONG Bingbing FAN Yongqiang CHEN Qiancheng GAO Zhe LI Hailong WANG Xinyue ZHANG Li GUAN Hongxia LI Rui ZHANG | 2022 | Journal of Advanced Ceramics2022，11，8： | 0 |
| 11 | Riddle of the Sphinx:facts and evidence regarding the link between mental stress and tumor occurrence and development显示文摘To the Editor:The answer to the'Riddle of Sphinx'is'human',whose image is both negative and positive.It is often used as a metaphor for complex,mysterious,and incomprehensible problems.With the deterioration of modern living environment and the aggravation of stress,the incidence of the tumor is on the rise.Excessive or prolonged stress can lead to acute or chronic organ dysfunction and metabolic disorders. | Ruilin Wang Sheng Yu Limeng Yu Qiming Wang Yufeng Wu | 2022 | Chinese Medical Journal2022，135，24： | 0 |
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