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| 1 | Tribological properties of nanometer cerium oxide as additives in lithium grease显示文摘This paper presents a comparative study of the influence of nanometer-CeO_2(nano-CeO_2) and temperature on tribological and lubricating properties of lithium grease. The morphology and structure of nanocrystals were characterized by means of transmission electron microscopy(TEM) and X-ray diffraction(XRD), respectively. Friction and wear tests were conducted on the friction and wear tester.Results show that the lithium grease with addition of nanometer-CeO_2 has much better friction-reducing and anti-wear performance than that of base grease. When the additive in grease is 0.6 wt%, the friction coefficient(COF) and wear scar diameter(WSD) decrease by 28% and 13% comparing with base grease,respectively. The base grease and grease with 0.6 wt% nanometer-CeO_2 both possess the lowest average COF and wear width at 50 ℃. The worn surface morphology after friction test was analyzed by scanning electron microscopy(SEM) and NANOVEA three-dimensional profilometer. Under the lubrication of the lithium grease containing 0.6 wt% nano-CeO_2. few shallow furrows can be observed on the quite smoothed surface and the WSD decreased. Moreover, It was found that the nano-CeO_2 has been incorporated into the surface protective and lubricious layer by energy dispersive spectrometer(EDS) analysis. | Qiang He Anling Li Yachen Guo Songfeng Liu Yong Zhang Linghao Kong | 2018 | Journal of Rare Earths2018，36，2： | 6 |
| 2 | Downregulation of caveolin-1 contributes to the synaptic plasticity deficit in the hippocampus of aged rats显示文摘Caveolin-1 is involved in the regulation of synaptic plasticity,but the relationship between its expression and cognitive function during aging remains controversial.To explore the relationship between synaptic plasticity in the aging process and changes in learning and memory,we examined caveolin-1 expression in the hippocampus,cortex and cerebellum of rats at different ages.We also examined the relationship between the expression of caveolin-1 and synaptophysin,a marker of synaptic plasticity.Hippocampal caveolin-1 and synaptophysin expression in aged(22–24 month old)rats was significantly lower than that in young(1 month old)and adult(4 months old)rats.Expression levels of both proteins were significantly greater in the cortex of aged rats than in that of young or adult rats,and levels were similar between the three age groups in the cerebellum.Linear regression analysis revealed that hippocampal expression of synaptophysin was associated with memory and learning abilities.Moreover,synaptophysin expression correlated positively with caveolin-1 expression in the hippocampus,cortex and cerebellum.These results confirm that caveolin-1 has a regulatory effect on synaptic plasticity,and suggest that the downregulation of hippocampal caveolin-1 expression causes a decrease in synaptic plasticity during physiological aging. | Yang Liu Zhanhua Liang Jing Liu Wei Zou Xiaoyan Li Yachen Wang Lijia An | 2013 | Neural Regeneration Research2013，8，29： | 6 |
| 3 | Multi-omic characterization of genome-wide abnormal DNA methylation reveals diagnostic and prognostic markers for esophageal squamous-cell carcinoma显示文摘This study investigates aberrant DNA methylations as potential diagnosis and prognosis markers for esophageal squamous-cell carcinoma(ESCC),which if diagnosed at advanced stages has<30%five-year survival rate.Comparing genome-wide methylation sites of 91 ESCC and matched adjacent normal tissues,we identified 35,577 differentially methylated CpG sites(DMCs)and characterized their distribution patterns. | Yiyi Xi Yuan Lin Wenjia Guo Xinyu Wang Hengqiang Zhao Chuanwang Miao Weiling Liu Yachen Liu Tianyuan Liu Yingying Luo Wenyi Fan Ai Lin Yamei Chen Yanxia Sun Yulin Ma Xiangjie Niu Ce Zhong Wen Tan Meng Zhou Jianzhong Su Chen Wu Dongxin Lin | 2022 | Signal Transduction and Targeted Therapy2022，7，3： | 2 |
| 4 | Graph Computing Based Security Constrained Unit Commitment in Hydro-thermal Power Systems Incorporating Pumped Hydro Storage显示文摘This paper proposes a graph computing based mixed integer programming(MIP)framework for solving the security constrained unit commitment(SCUC)problem in hydro-thermal power systems incorporating pumped hydro storage(PHS).The proposed graph computing-based MIP framework considers the economic operations of thermal units,cascade hydropower stations and PHS stations,as well as their technical impacts towards the network security.First,the hydro-thermal power system data and unit information are stored in a graph structure with nodes and edges,which enables nodal and hierarchical parallel computing for the unit commitment(UC)solution calculation and network security analysis.A MIP model is then formulated to solve the SCUC problem with the mathematical models of thermal units,cascade hydropower stations and PHS stations.In addition,two optimization approaches including convex hull reformulation(CHR)and special ordered set(SOS)methods are introduced for speeding up the MIP calculation procedure.To ensure the system stability under the derived UC solution,a parallelized graph power flow(PGPF)algorithm is proposed for the hydro-thermal power system network security analysis.Finally,case studies of the IEEE 118-bus system and a practical 2749-bus hydro-thermal power system are introduced to demonstrate the feasibility and validity of the proposed graph computing-based MIP framework. | Longfei Wei Guangyi Liu Shen Yan Renchang Dai Yachen Tang | 2021 | CSEE Journal of Power and Energy Systems2021，7，3： | 2 |
| 5 | Learning with privileged information using Bayesian networks显示文摘 | Shangfei WANG Menghua HE Yachen ZHU Shan HE Yue LIU Qiang JI | 2015 | Frontiers of Computer Science2015，9，2： | 1 |
| 6 | Phenological records in Guanzhong Area in central China between 600 and 902 AD as proxy for winter half-year temperature reconstruction显示文摘Phenological data obtained from historical documents constitute highly important ecological evidence for the pre-instrumental period, and can be used in analyzing climatic change in history. In this study, 87 phenological records about seasonality of non-biological events(e.g., first frost date), agriculture and ornamental plants(e.g., first flowering date) over 77 years were extracted from historical documents from the Sui and Tang dynasties in China to reconstruct the winter half-year(from October to next April) temperatures in the Guanzhong Area(located in central China) from 600 to 902 AD. Transfer functions between temperature and phenophases with significant correlations were established by using modern observation data. Temperatures from the study period were reconstructed by applying the transfer functions to historical phenological data. The reconstruction indicates that the winter half-year temperatures during 600–902 AD were 0.23°C higher than the reference period(1961–1990). The temperature changed with two distinct stages. During the 600s–800s, temperatures were approximately 0.38°C higher than at present but then temperatures decreased in the subsequent period(800–902 AD). These results are similar to ones from previous studies on the mean temperature and the divisions between warm and cold periods during the study period, though differences were found in the degree of warmness/coldness. This reconstruction provides a valuable contribution to a better understanding of climatic variability during the Sui and Tang dynasties in China. | LIU YaChen DAI JunHu WANG HuanJiong YE Yu LIU HaoLong | 2016 | Science China Earth Sciences2016，59，9： | 1 |
| 7 | VAV2 is required for DNA repair and implicated in cancer radiotherapy resistance显示文摘Radiotherapy remains the mainstay for treatment of various types of human cancer;however,the clinical efficacy is often limited by radioresistance,in which the underlying mechanism is largely unknown.Here,using esophageal squamous cell carcinoma(ESCC)as a model,we demonstrate that guanine nucleotide exchange factor 2(VAV2),which is overexpressed in most human cancers,plays an important role in primary and secondary radioresistance.We have discovered for the first time that VAV2 is required for the Ku70/Ku80 complex formation and participates in non-homologous end joining repair of DNA damages caused by ionizing radiation. | Weiling Liu Chuanwang Miao Shaosen Zhang Yachen Liu Xiangjie Niu Yiyi Xi Wenjia Guo Jiahui Chu Ai Lin Hongjin Liu Xinyu Yang Xinjie Chen Ce Zhong Yuling Ma Yuqian Wang Shihao Zhu Shuning Liu Wen Tan Dongxin Lin Chen Wu | 2021 | Signal Transduction and Targeted Therapy2021，6，9： | 1 |
| 8 | Study on the cross-regional urban flexible management pattern显示文摘 | Feng Han Yachen Liu | 2008 | Intemational Journal of Business and Managenment2008，3，11： | 1 |
| 9 | Direct measurement and theoretical prediction model of interparticle adhesion force between irregular planetary regolith particles显示文摘Interparticle adhesion force has a controlling effect on the physical and mechanical properties of planetary regolith and rocks.The current research on the adhesion force of planetary regolith and rock particles has been primarily based on the assumption of smooth spherical particles to calculate the intergranular adhesion force;this approach lacks consideration for the adhesion force between irregular shaped particles.In our study,an innovative approach was established to directly measure the adhesion force between the arbitrary irregular shaped particles;the probe was modified using simulated lunar soil particles that were a typical representation of planetary regolith.The experimental results showed that for irregular shaped mineral particles,the particle size and mineral composition had no significant influence on the interparticle adhesion force;however,the complex morphology of the contact surface predominantly controlled the adhesion force.As the contact surface roughness increased,the adhesion force gradually decreased,and the rate of decrease gradually slowed;these results were consistent with the change trend predicted via the theoretical models of quantum electrodynamics.Moreover,a theoretical model to predict the adhesion force between the irregular shaped particles was constructed based on Rabinovich’s theory,and the prediction results were correlated with the experimental measurements. | Heping Xie Qi Wu Yifei Liu Yachen Xie Mingzhong Gao Cunbao Li | 2023 | International Journal of Mining Science and Technology2023，33，11： | 0 |
| 10 | Switchable optical nonlinear properties of W_(18)O_(49) nanowires by Ag nanoparticles supported显示文摘During the past decades,nonlinear optical(NLO)materials have attracted special interest because of their potential applications in photonic devices,such as optical switching,frequency conversion and electro-optic modulators.Among the finding ways to obtain excellent NLO materials with both large NLO response and short response time,the most common approach is to design and prepare new | Yang Liu XueSong Xu Yang Chen ZhenYi Zhang YaChen Gao KuiChao Liu LiDong Gong Bin Dong | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，11： | 0 |
| 11 | Research on angle-dependent to mographic static correction显示文摘Reflection data in CMP has influenced seriously in static calculations,especially in some highly weathered and structurally altered circumstances. Because of static correction in the existed problems and requests,the authors studied the angle dependent tomographic static correction,and discussed its basic theory, including the establishment of forward model,the calculation theory of tomography and tomographic static correction. The usage of theoretical models and practical information on the method has been validated. The results show that using these methods to calculate static correction in a complex area,the quality of static correction is greatly improved. | CHEN Guangyu LIU Yang WANG Kai ZHANG Yachen | 2012 | Global Geology2012，15，2： | 0 |
| 12 | Large-Scale Underground Storage of Renewable Energy Coupled with Power-to-X:Challenges,Trends,and Potentials in China显示文摘1.Introduction Promoting the green and low-carbon transition of energy systems and constructing a new renewable-dominated power system is essential to achieving carbon neutrality in China[1,2].Furthermore,implementing electrification and hydrogenation strategies to address energy consumption is necessary for a successful energy transition.China’s share of electricity in its total energy consumption is estimated to increase from 26%in 2021 to more than 70%by 2060. | Yachen Xie Jiashun Luo Zhengmeng Hou Gensheng Li Jianhua Liu Jianwei Tang Liangchao Huang Hans-Peter Beck Chunhe Yang | 2023 | Engineering2023，，10： | 0 |
| 13 | Anisotropic time-dependent behaviors of shale under direct shearing and associated empirical creep models显示文摘Understanding the anisotropic creep behaviors of shale under direct shearing is a challenging issue.In this context,we conducted shear-creep and steady-creep tests on shale with five bedding orientations (i.e.0°,30°,45°,60°,and 90°),under multiple levels of direct shearing for the first time.The results show that the anisotropic creep of shale exhibits a significant stress-dependent behavior.Under a low shear stress,the creep compliance of shale increases linearly with the logarithm of time at all bedding orientations,and the increase depends on the bedding orientation and creep time.Under high shear stress conditions,the creep compliance of shale is minimal when the bedding orientation is 0°,and the steady-creep rate of shale increases significantly with increasing bedding orientations of 30°,45°,60°,and 90°.The stress-strain values corresponding to the inception of the accelerated creep stage show an increasing and then decreasing trend with the bedding orientation.A semilogarithmic model that could reflect the stress dependence of the steady-creep rate while considering the hardening and damage process is proposed.The model minimizes the deviation of the calculated steady-state creep rate from the observed value and reveals the behavior of the bedding orientation's influence on the steady-creep rate.The applicability of the five classical empirical creep models is quantitatively evaluated.It shows that the logarithmic model can well explain the experimental creep strain and creep rate,and it can accurately predict long-term shear creep deformation.Based on an improved logarithmic model,the variations in creep parameters with shear stress and bedding orientations are discussed.With abovementioned findings,a mathematical method for constructing an anisotropic shear creep model of shale is proposed,which can characterize the nonlinear dependence of the anisotropic shear creep behavior of shale on the bedding orientation. | Yachen Xie Michael Z.Hou Hejuan Liu Cunbao Li | 2024 | Journal of Rock Mechanics and Geotechnical Engineering2024，16，4： | 0 |
| 14 | Sensitivity of solar greenhouse envelopes to the thermal disfigurements and optimal selection of the thermal insulation quilt显示文摘The objectives of the present work are focused on exploration of the reasons for temperature difference in different envelopes,the sensitivity of envelopes of solar greenhouse to thermal disfigurements and optimal selection of the thermal insulation quilt.Theoretical analysis and derivation are conducted according to the experimental results of surface temperature,convective heat transfer,and heat flux density in different envelopes which with thermal disfigurements of solar greenhouse using heat transfer theory.The results revealed that the difference of intrinsic thermal conductivity and thickness of the envelopes leads to difference in the thermal flux and thus in the surface temperature of different envelopes.Compared with the front roof and back roof,the wall is more sensitive to thermal disfigurements.According to the influence of thermal disfigurements on solar greenhouse temperature,the allowable thermal disfigurements area fraction of front roof and back roof are given.Based on the analysis of heat transfer theory and test results,the work given the expression of the thickness and thermal conductivity of thermal insulation quilt under different outdoor minimum temperatures for optimal selection of thermal insulation quilt based on comprehensive considering factors of the solar greenhouse structure,crop demand,outdoor minimum temperature,and insulation quilt properties.The results of this work give technical criterion for whether the envelopes with thermal disfigurements needs to be repaired or replaced,and it also provides theoretical and technical support for design the solar greenhouse as well as methodological guidance for the optimal selection of the thermal insulation quilt. | Yachen Sun Yao Zhang Chenmeng Zhu Shaonan Xu Bowen Liu Yanfei Cao Changji Zhou Yaqi Zhou Zhirong Zou Encai Bao | 2021 | International Journal of Agricultural and Biological Engineering2021，14，5： | 0 |
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