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20篇 您的检索式:作者名="Meng Yanfeng"
    题名 作者 年代 出处 被引量
1Hydroisomerization performance of platinum supported on ZSM-22/ZSM-23 intergrowth zeolite catalyst显示文摘Hydroisomerization catalysts Pt/ZSM-22,Pt/ZSM-23,and Pt/ZSM-22/ZSM-23 were prepared by supporting Pt on ZSM-22,ZSM-23,and intergrowth zeolite ZSM-22/ZSM-23,respectively.The typical physicochemical properties of these catalysts were characterized by X-Ray Diffraction(XRD),N2 absorption-desorption,Pyridine-Fourier Transform Infrared(Py-FTIR),Transmission Electron Microscopy(TEM),X-Ray Fluorescence(XRF),Scanning Electron Microscopy(SEM) and NH3-Temperature Programmed Desorption(NH3-TPD),and the performance of these catalysts in n-dodecane hydroisomerization was evaluated in a continuous down-flow fixed bed with a stainless steel tubular reactor.The characterization results indicated that the intergrowth zeolite ZSM-22/ZSM-23 possessed the dual structure of ZSM-22 and ZSM-23,and the catalyst Pt/ZSM-22/ZSM-23 had similar pores and weak acidity to Pt/ZSM-22 and Pt/ZSM-23 catalysts.Moreover,Pt/ZSM-22/ZSM-23 catalyst showed a high selectivity in hydroisomerization of long chain n-alkanes to mono-branched isomers.The evaluation results for n-dodecane hydroisomerization indicated that the activity of Pt/ZSM-22/ZSM-23 was the lowest,while the hydroisomerization selectivity was the highest among the three catalysts.The maximum yield of i-dodecane product was 68.3% over Pt/ZSM-22/ZSM-23 at 320 oC.Chi Kebin Zhao Zhen Tian Zhijian Hu Sheng Yan Lijun Li Tianshu Wang Bingchun Meng Xiangbin Gao Shanbin Tan Mingwei Liu Yanfeng 2013Petroleum Science2013,10,2:8
2Evaluation with low-dose dual-phase helical computed tomography of patients with thyroid lesions显示文摘Li Lin Wang Yong Zhao Yanfeng Zou Shuangmei Lin Meng Yu Xiaoduo Tang Wei Zhou Chunwu Luo Dehong 2014Chinese Medical Journal2014,,22:3
3Bioinspired synthesis of CVD graphene flakes and graphene-supported molybdenum sulfide catalysts for hydrogen evolution reaction显示文摘化学蒸汽免职是为在平面底层上种大区域的高质量的 graphene 电影的大多数有希望途径。在侧面的生长以外,合成三维(3D ) graphene 最近也在金属泡沫和绝缘的 nanoparticles 上被表明了为在电气化学的电极探索他们的应用。然而,存在途径也需要丰富的开始预制,或为 graphene 生长构造多孔的框架底层。此处,我们报导一直接,为用化学蒸汽免职(CVD ) 在乌贼骨底层上种大数量的 graphene 薄片的 bioinspired 策略方法。从生长底层的分开的 graphene 薄片是高度水晶的,超过并且层厚度可控制传统化学上,有很少表面的 exfoliated graphene 组织。由于他们继承导出 biomineral 的形态学, 3D graphene 微观结构显示出高度暴露并且弯的表面,它能装载更多的瞬间 x (x 2 ) 催化剂比对高度有效的氢产生的另外的平面支持。简短, bioinspired 途径被期望为 graphene 生产完成在质量和数量之间的合理平衡,因此推进它在精力的宽应用存储和变换设备。Ke Chen Cong Li Zhaolong Chen Liurong Shi Sathish Reddy Huan Meng Qingqing Ji Yanfeng Zhang Zhongfan Liu 2016Nano Research2016,9,1:2
4Identification of a novel HLA-A2-restricted cytotoxic T lymphocyte epitope from cancer-testis antigen PLAC1 in breast cancer显示文摘Wei Liu Mingxia Zhai Zongyin Wu Yuanming Qi Yahong Wu Chao Dai Meng Sun Lu Li Yanfeng Gao 2012Amino Acids2012,,:1
5Influence of shear on polypropylene crystallization kinetics显示文摘Huo Hong Meng Yanfeng Li Hongfei 2004Eur Phys J E2004,15,2:1
6The design of HEPS global timing system显示文摘Purpose The high energy photon source(HEPS)is a 4th generation synchrotron light source under construction by the institute of high energy physics.The accelerator complex consists of a 500-MeV Linac,a full-energy synchrotron booster,a 6-GeV synchrotron storage ring(SR),and three e-beam transport lines for injection and extraction among accelerators.A global timing system(GTS)covers the timing needs for all accelerator,beamline,and experiment systems.The GTS is designed to coordinate the injection processes and various measurements and protections.Most systems require that the RMS jitter of the GTS signal is less than 30 ps,while the trigger jitters for the electron gun and SR injection and extraction kickers are less than 10 ps.Method The HEPS GTS is an event-based timing system based on MicroTCA.4 hardware architecture.The MicroTCA.4300 series products from the micro-research Finland Oy are implemented in the HEPS GTS system.Results and conclusions The RMS jitter,integrated from 1 Hz to 10 MHz,of the 166.6 MHz event clock is 5.489 ps.The RMS jitter of TTL outputs is less than 30 ps.This paper reports the design of the HEPS GTS,which satisfies all of the HEPS physics requirements for timing with preliminary test results shown.Fang Liu Ge Lei Zhe Duan Cai Meng Chenyan Lu Yanhua Shao Xinpeng Ma Nan Gan Yuemei Peng Jianshe Cao Chungming Chu Yanfeng Sui Jingyi Li IHEP 2021Radiation Detection Technology and Methods2021,5,3:1
7Highly safe and ionothermal synthesis of Ti3C2 MXene with expanded interlayer spacing for enhanced lithium storage显示文摘MXene is a rising star of two-dimensional(2D)materials for energy relative applications,however,the traditional synthesis of MXene etched by hazard HF acid or LiF+HCl mixed solution is highly dangerous with the risk of splashing or pouring liquid solutions.In this work,we developed a water-free ionothermal synthesis of 2D Ti3C2 MXene via etching pristine Ti3AlC2 MAX in low-cost choline chloride and oxalic acid based deep eutectic solvents(DES)with the presence of NH4F,thus it was highly safe and convenient to operate solid precursor and product materials at room temperature.Benefited from the low vapor pressure and solvating properties of DES,the prepared Ti3C2(denoted as DES-Ti3C2)possessed a high purity up to 98% compared with 95% for HF etched Ti3C2(denoted as HF-Ti3C2).Notably,an expanded interlayer spacing of 1.35 nm could be achieved due to the intercalation of choline cations in DES-Ti3C2,larger than that of HF-Ti3C2(0.98 nm).As a result,the DES-Ti3C2 anodes exhibited enhanced lithium storage performance,such as high reversible capacity of 208 m Ah g-1at 0.5 A g-1,and long cycle life over 400 times,outperforming most reported pure MXene anodes.The ionothermal synthesis of MXene developed here may pave a new way to safely prepare other MXene for various energy relating applications.Junbiao Wu Yu Wang Yaopeng Zhang Hao Meng Yan Xu Yide Han Zhuopeng Wang Yanfeng Dong Xia Zhang 2020Journal of Energy Chemistry2020,29,8:1
8Physiological effects of NaC1 stress on cucumber germination and seedling growth 显示文摘Huanwen M Hongwen C Yanfeng Z Jing S Meng Z 1999Cucurbit Genetics Cooperative Report1999,22,:1
9Chemical modification of silica-gel with hydroxyl- or amino-terminated polyamine for adsorption of Au(III)显示文摘Rongjun Qu Minghua Wang Changmei Sun Ying Zhang Chunnuan Ji Hou Chen Yanfeng Meng Ping Yin 2008Applied Surface Science2008,,5:1
10MA Cation-Induced Diffusional Growth of Low-Bandgap FA-Cs Perovskites Driven by Natural Gradient Annealing显示文摘Low-bandgap formamidinium-cesium(FA-Cs)perovskites of FA_(1-x)CsxPbI_(3)(x<0:1)are promising candidates for efficient and robust perovskite solar cells,but their black-phase crystallization is very sensitive to annealing temperature.Unfortunately,the low heat conductivity of the glass substrate builds up a temperature gradient within from bottom to top and makes the initial annealing temperature of the perovskite film lower than the black-phase crystallization point(~150℃).Herein,we take advantage of such temperature gradient for the diffusional growth of high-quality FA-Cs perovskites by introducing a thermally unstable MA^(+)cation,which would firstly formα-phase FA-MA-Cs mixed perovskites with low formation energy at the hot bottom of the perovskite films in the early annealing stage.The natural gradient annealing temperature and the thermally unstable MA^(+)cation then lead to the bottom-to-top diffusional growth of highly orientatedα-phase FA-Cs perovskite,which exhibits 10-fold of enhanced crystallinity and reduced trap density(~3:85×10^(15) cm^(−3)).Eventually,such FA-Cs perovskite films were fabricated into stable solar cell devices with champion efficiency up to 23.11%,among the highest efficiency of MA-free perovskite solar cells.Taiyang Zhang Yuetian Chen Miao Kan Shumao Xu Yanfeng Miao Xingtao Wang Meng Ren Haoran Chen Xiaomin Liu Yixin Zhao 2021Research2021,,1:1
11A robust scheduling algorithm for space telescopes with unpredictable tasks显示文摘The original preset schedule of space telescopes can be disrupted when they receive ultra-high-priority unpredictable tasks.The main objective of this study is to observe such unpredictable tasks,the instability of which leads to failures in delivering the promises made.This paper proposes a method for retaining the robustness of the original plan.We use space-based multi-band variable objects monitor(SVOM)mission as an example to introduce the proposed method.First,the reasons for instability are discussed in detail.Two proactive strategies are proposed to promote the robustness of the schedule.The proactive strategies use the available windows of a given list of jobs.However,the realistic problem of SVOM is analysed using a rescheduling algorithm based on NSGA-II experiments with SVOM scenarios showing that the two proposed strategies are effective in reducing the instability caused by unpredictable interruption.LI DaLin GU YanFeng JAUBERT Jean LIU YuRong BAI Meng FENG Zhun 2021Science China(Technological Sciences)2021,64,3:1
12Breed-linked polymorphisms of porcine toll-like receptor 2 (TLR2) and TLR4 and the primary investigation on their relationship with prevention against Mycoplasma pneumoniae and bacterial LPS challenge显示文摘Xiaomin Fang Xiao Liu Cui Meng Yanfeng Fu Xuemin Wang Bixia Li Feng Tu Fang Zhao Shouwen Ren 2013Immunogenetics2013,,11:1
13Long afterglow yellow luminescence from Pr^(3+) doped SrSc_(2)O_(4)显示文摘A yellow emitting long afterglow luminescence material SrSc_(2)O_(4):Pr^(3+)was successfully prepared by solid state reaction method.SrSc_(2)O_(4):Pr^(3+)phosphor shows a long afterglow luminescence peak at about 495,545,621,630 and 657 nm,respectively,corresponding to the f–f transitions of Pr^(3+).The afterglow chromaticity coordinates of SrSc_(2)O_(4):1 at%Pr^(3+)were calculated to be(0.35,0.41),indicating that the afterglow emission is close to the light of yellow region.And,the afterglow luminescence of the optimal sample doped by 1 at%Pr^(3+)can persist for over 3 h.The thermoluminescence results suggest that there are three types of traps with depth of 0.61,0.69 and 0.78 eV exiting for all the samples,which are produced by the addition of Pr^(3+)ions.The trap density of SrSc_(2)O_(4):1 at%Pr^(3+)is the maximum when the incorporation of Pr^(3+)ions reaches 1 at%,which thus results in the longest afterglow luminescence.All the results indicate that SrSc_(2)O_(4):Pr^(3+)can be a potential candidate of novel long afterglow phosphors.Xiaoyan Fu Shenghui Zheng Yanfeng Meng Wenzhi Sun Hongwu Zhang 2022Journal of Rare Earths2022,40,4:1
14Just-in-Time Human Gesture Recognition Using WiFi Signals显示文摘In-air gesture recognition using wireless signals acts as a key enabler for various applications including smart homes, remote healthcare, shared autopilot, etc. Although researchers have conducted extensive research on Wi Fi-based gesture recognition, it remains an open question of providing accurate, robust, and in-time recognition system with the commodity WiFi infrastructure. We present Fa See, a just-in-time Wi Fibased gesture recognition system by identifying the fine-grained Channel state information(CSI) features upon off-the-shelf WiFi devices. The core of Fa See is essentially a novel hybrid recognition algorithm, which combines the classical K-Means algorithm with Dynamic time warping(DTW) together, to transform the feature matching in traditional gesture recognition schemes into a hierarchical manner, thereby significantly improving the recognition efficiency. Experimental results show that Fa See recognizes 9 representative gestures with an average accuracy of 94.75% without tedious per-person training,while achieving 30% signal processing delay saving when compared with the state-of-the-arts gesture recognition schemes.MENG Xianjia FENG Lin CHEN Hao CHEN Ting MA Jianfeng WANG Anwen LIU Dongdong ZHAO Yanfeng 2021Chinese Journal of Electronics2021,30,6:1
15Direct Three-Component Synthesis of a-Cyano Acrylates Involving Cascade Knoevenagel Reaction and Esterification显示文摘Yanfeng Jing Jiaojiao Meng Yunyun Liu Jie-Ping Wan 2015Chinese Journal of Chemistry2015,33,10:0
16Experimental observation of multiple topological nodal structure in LaSb_(2)显示文摘Unconventional fermions in the immensely studied topological semimetals are the source for rich exotic topological properties.Here,using symmetry analysis and first-principles calculations,we propose the coexistence of multiple topological nodal structure in LaSb_(2),including topological nodal surfaces,nodal lines and in particular eightfold degenerate nodal points,which have been scarcely observed in a single material.Further,utilizing angle-resolved photoemission spectroscopy,we confirm the existence of nodal surfaces and eightfold degenerate nodal points in LaSb_(2).The intriguing multiple topological nodal structure might play a crucial role in giving rise to the large linear magnetoresistance.Our work renews the insights into the exotic topological phenomena in LaSb_(2).Yuxi Qiao Fuyi Wang Huaiqiang Wang Zicheng Tao Zhicheng Jiang Zhengtai Liu Soohyun Cho Fayuan Zhang Qingkai Meng Wei Xia Yichen Yang Zhe Huang Jishan Liu Zhonghao Liu Zengwei Zhu Shan Qiao Yanfeng Guo Haijun Zhang Dawei Shen 2024Science China(Physics,Mechanics & Astronomy)2024,67,4:0
173D bioprinting of in vitro porous hepatoma models:establishment,evaluation,and anticancer drug testing显示文摘Traditional tumor models do not tend to accurately simulate tumor growth in vitro or enable personalized treatment and are particularly unable to discover more beneficial targeted drugs.To address this,this study describes the use of threedimensional(3D)bioprinting technology to construct a 3D model with human hepatocarcinoma SMMC-7721 cells(3DP-7721)by combining gelatin methacrylate(GelMA)and poly(ethylene oxide)(PEO)as two immiscible aqueous phases to form a bioink and innovatively applying fluorescent carbon quantum dots for long-term tracking of cells.The GelMA(10%,mass fraction)and PEO(1.6%,mass fraction)hydrogel with 3:1 volume ratio offered distinct pore-forming characteristics,satisfactorymechanical properties,and biocompatibility for the creation of the 3DP-7721 model.Immunofluorescence analysis and quantitative real-time fluorescence polymerase chain reaction(PCR)were used to evaluate the biological properties of the model.Compared with the two-dimensional culture cell model(2D-7721)and the 3D mixed culture cell model(3DM-7721),3DP-7721 significantly improved the proliferation of cells and expression of tumor-related proteins and genes.Moreover,we evaluated the differences between the three culture models and the effectiveness of antitumor drugs in the three models and discovered that the efficacy of antitumor drugs varied because of significant differences in resistance proteins and genes between the three models.In addition,the comparison of tumor formation in the three models found that the cells cultured by the 3DP-7721 model had strong tumorigenicity in nude mice.Immunohistochemical evaluation of the levels of biochemical indicators related to the formation of solid tumors showed that the 3DP-7721 model group exhibited pathological characteristics of malignant tumors,the generated solid tumors were similar to actual tumors,and the deterioration was higher.This research therefore acts as a foundation for the application of 3DP-7721 models in drug development research.Xiaoyuan Wang Zixian Liu Qianqian Duan Boye Zhang Yanyan Cao Zhizhong Shen Meng Li Yanfeng Xi Jianming Wang Shengbo Sang 2024Bio-Design and Manufacturing2024,7,2:0
18Cs-content-dependent organic cation exchange in FA1-xCsxPbI3 perovskite显示文摘FA-Cs mixed-cation perovskite has been reported as a promising candidate for obtaining highly efficient and stable photovoltaic devices.Phenylethylamine iodide(PEAI)post-treatment is a widely used and effective method for surface passivation of FA-Cs perovskite layer in devices.However,it is still controversial whether the PEAI post-treatment would form two-dimensional(2D)perovskite PEA_(2)PbI_(4) capping layer or just result in PEA+terminated surface.Here in this work,the function of PEAI post-treatment on FA-Cs mixed-cation perovskite FA_(1-x)Cs_(x)PbI_(3)(x=0.1–0.9)with varied Cs contents is elucidated.With increased Cs content,the FA-Cs perovskite shows higher resistance to the cation exchange between FA+and PEA+.This Cs-content-dependent cation exchange results in the different PEAI reaction preferences with FA-Cs mixed-cation perovskites.Furthermore,higher Cs content with stronger resistance to cation exchange reaction leads to a wider processing window for post-treatment and defect passivation,which is beneficial for the fabrication of large-scale photovoltaic devices.Meng Ren Jielin Shi Yuetian Chen Yanfeng Miao Yixin Zhao 2022Journal of Energy Chemistry2022,31,9:0
19Thermal performance and evaluation of a novel stratified and mixed flexible transformation solar heat storage unit显示文摘It is necessary to satisfy the flexible requirements of solar heat storage systems to provide efficient heating and constant-temperature domestic hot water at different periods.A novel heat storage tank with both stratified and mixing functions is proposed,which can realize the integration of stable stratification and rapid mixing modes.In this research,a three-dimensional heat transfer model of the heat storage tank with stratified and mixed dual modes was established,and a thermal performance test system for the tank was built in the State Key Laboratory of Green Building in Western China.Moreover,a new evaluation index representing the mixing speed is proposed.The stratification effect and mixing characteristics of the tank were studied under different comprehensive conditions.The results show that the exergy efficiency of the tank with a stratified pipe can be increased by 10%–15%compared to that of a conventional tank.Additionally,the recommended optimal flow rate range for well-stratified tanks is 4–6 L/min.The mixing nozzle of the tank reduces the mixing reaction coefficient by 0.27 and significantly reduces the mixing time.This study provides critical guidance to meet the flexible thermal needs of users and implement high-performance applications using the stratified and mixing modes of heat storage tanks.Dengjia Wang Hui Liu Yingying Wang Kaili Liu Yanfeng Liu Meng Gao Jianhua Fan 2023Building Simulation2023,16,10:0
20Reduced graphene oxide/2D colloidal array composite membrane fabricated layer-by-layer显示文摘Photonic crystal(Ph C) presents unique optical properties and functionality, and are used widely as detectors, modulators, plasmonics and light generating devices. However, the low electrical conductivity and mechanical strength limit its applications. We introduced here a layer-by-layer composite membrane based on reduced graphene oxide(RGO) and two-dimensional(2 D) colloidal crystal array(CCA). The 2 D CCA was fabricated by an air/water interface deposition technique using polystyrene(PS)and polymethyl methacrylate(PMMA) colloidal particles. The composite membrane were characterized by SEM, Debye diffraction, reflectance spectra and electrical resistance measurement. The results indicated that layer-by-layer composite membrane have highly periodicity, and the monolayer of RGO and 2 D CCA combined tightly. The Debye diffraction rings of the layer-by-layer heterostructure composite are the superimposition of the individual monolayers of 2 D CCA. The reflection spectrum of the layer-by-layer heterostructure composite membrane showed that two peaks of reflection curve located in near ultraviolet region and visible region respectively, and the RGO sheet have no influence on the peak position and shape of reflection curve of the Ph C. The RGO improved the electrical conductivity of the layer-by-layer heterostructure composite. The layer-by-layer heterostructure composite showed promising potential for the applications as sensors and optoelectronic devices.Dan Yan Lili Qiu Yanfeng Wang Zihui Meng Min Xue Fenglian Qi 2018Chinese Chemical Letters2018,29,6:0
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