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When does a diblock copolymer probe the interfacial rheological effect?

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Science China Chemistry 2016年第10期59卷 1330-1334页

作者： Jingfa Yang jiang zhao Institute of Chemistry Chinese Academy of Sciences

Lateral diffusion of diblock copolymer residing on the interfaces between two immiscible liquids is investigated at single molecular level. Fluorescence correlation spectroscopy was used to study the diffusion of fluorescence-labeled diblock copolymer,polystyrene-b-polyisoprene, at the interface formed between two immiscible liquids. The interfaces are formed between N,N-dimethylformamide(DMF) and a few immiscible liquids, n-alkane and polyisoprene. Interfacial diffusion coefficient of the diblock copolymer probe is found to decrease monotonously with the increase of the molecular length of the interface constituting liquids. The decrease of diffusion coefficient follows the prediction by Einstein relation using the viscosity of the constituting liquids as the variables only for interfaces between DMF and very small n-alkanes. For interfaces formed between DMF and bigger alkanes and especially between DMF and polyisoprene, the diffusion coefficient is much higher than the calculated value,indicating that the probe molecule starts to probe the much less viscous interfacial region because the interfacial width gets larger,whose thickness is comparable to the molecule size of the liquids.

关键词： interfaces diffusion immiscible liquids single molecule fluorescence

A brief review on 7 papers from the special issue of “The environmental significance of soft-sediment deformation” of the Sedimentary Geology 344(2016)

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Journal of Palaeogeography 2017年第4期6卷 243-250页

作者： Zeng-zhao feng China University of Petroleum (Beijing)

From the viewpoint of origins of soft-sediment deformation structures（SSDS）, 7 papers（Ito et al.,2016; jiang et al., 2016; Lunina and Gladkov, 2016; Moretti et al., 2016; Rana et al., 2016; Rodríguez-Pascua et al., 2016; Wheatley et al., 2016） selected from the special issue of ＂The environmental significance of softsediment deformation＂ of the Sedimentary Geology 344（2016） were reviewed.（1） The first paper（according to the published order） by Moretti et al. is a general review and introduction of this special issue. This special issue has made an important contribution to the study of sedimentary environments.（2） The fourth paper by Rodríguez-Pascua et al. is an excellent case study. All evidence of earthquake in this paper is reliable. The old Roman City（adjacent to Madrid, the capital of Spain） was definitely destroyed by an earthquake. This paper solved the problem that the archaeologists have not solved yet.（3） The 19 thpaper by Rana et al. is another excellent case study. It demonstrated that SSDS in the youngest modern sediments in the seismically active area, i.e., the Alaknanda Valley, Garhwal Himalaya, India, are of non-seismic origin, but with typically sedimentary origin. All evidence of sedimentary origin of SSDS in the study area is reliable.（4） The second paper by Lunina and Gladkov stated that SSDS（mainly clastic dikes） in epicentral areas of the recent earthquakes in southern Siberia were originated by earthquakes and that the clastic dikes are the most reliable indicators in the epicentral areas of earthquakes. This conclusion is right. However, it is not accurate to consider all clastic injections as ＂in-situ earthquake structures＂ in anywhere, because the clastic injections are with multiple origins.（5） The third paper by Wheatley et al. comprehensively stated the clastic pipes of the Jurassic in the Colorado Plateau, USA. However, the principal origin of the clastic pipes（columns） was possibly not originated by ＂palaeoseismic controls＂, but by ＂

关键词： Soft-sediment deformation structures(SSDS) Sedimentary environments Origins Contradictions Review Invitation

Analytical solution for stress and deformation of the mining floor based on integral transform

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International Journal of Mining Science and Technology 2015年第4期25卷 581-586页

作者： feng Qiang jiang Binsong State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology Civil Engineering and Architecture Shandong Key Laboratory of Civil Engineering Disaster Prevention & Mitigation Shandong University of Science and Technology

Following exploitation of a coal seam, the final stress field is the sum of in situ stress field and an excavation stress field. Based on this feature, we firstly established a mechanics analytical model of the mining floor strata. Then the study applied Fourier integral transform to solve a biharmonic equation,obtaining the analytical solution of the stress and displacement of the mining floor. Additionally, this investigation used the Mohr–Coulomb yield criterion to determine the plastic failure depth of the floor strata. The calculation process showed that the plastic failure depth of the floor and floor heave are related to the mining width, burial depth and physical–mechanical properties. The results from an example show that the curve of the plastic failure depth of the mining floor is characterized by a funnel shape and the maximum failure depth generates in the middle of mining floor; and that the maximum and minimum principal stresses change distinctly in the shallow layer and tend to a fixed value with an increase in depth. Based on the displacement results, the maximum floor heave appears in the middle of the stope and its value is 0.107 m. This will provide a basis for floor control. Lastly, we have verified the analytical results using FLAC3 Dto simulate floor excavation and find that there is some deviation between the two results, but their overall tendency is consistent which illustrates that the analysis method can well solve the stress and displacement of the floor.

关键词： Integral transform Mining floor Plastic failure depth Floor heave Analytical solution

In situ sol-gel synthesis of Ti2Nb10O29/C nanoparticles with enhanced pseudocapacitive contribution for a high-rate lithium-ion battery

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Rare Metals 2020年第9期39卷 1063-1071页

作者： Guang-Yin Liu Yi-Yang zhao Yu-feng Tang Xiao-Di Liu Miao Liu Peng-jiang Wu College of Chemistry and Pharmaceutical Engineering Nanyang Normal UniversityNanyang 473061China

Ti2Nb10O29/C nanoparticles with a carbon content of 13 wt%and a mean size of 50 nm were fabricated through a convenient and effective in situ sol-gel *** small grain size and carbon modification can improve the pseudocapacitive effect of the Ti2Nb10O29/C nanoparticles,leading to excellent rate capacity,especially at high current ***,the discharge capacity of the Ti2Nb10O29/C electrode is 258.3,236.0,216.6,184.5 and161.5 mAh·g-1 at different current densities of 1C,5C,10C,20C and ***,the discharge capacity of the Ti2Nb10O29 electrode is 244.9 mAh·g-1 at 1C,which is rapidly reduced to 89.7 mAh·g-1 at *** addition,the small size and carbon layer of the Ti2Nb10O29/C nanoparticles can supply abundant active sites for Li+storage as well as enhance the electronic conductivity and Li+diffusion,endowing these nanoparticles with a high discharge capacity and excellent cycle performance.

关键词： Nanoparticles Anode materials Sol-gel method Energy storage

Method of change management based on dynamic machining error propagation

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Science China(Technological Sciences) 2009年第7期52卷 1811-1820页

作者： feng Jia jiang PingYu State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China

In multistage machining processes(MMPs),the final quality of a part is influenced by a series of machining processes,which are complex *** it is necessary to research the rule of machin-ing error propagation to ensure the machining *** this issue,a change management method of quality control nodes(i.e.,QC-nodes) for machining error propagation is proposed.A new framework of QC-nodes is proposed including association analysis of quality attributes,quality closed-loop control,error tracing and error coordination *** the weighted directed network is introduced to describe and analyze the correlativity among the machining *** order to establish the dynamic machining error propagation network(D-MEPN),QC-nodes are defined as the network nodes,and the correlation among the QC-nodes is mapped onto the *** on the network analysis,the dynamic characteristics of machining error propagation are *** adaptive control method based on the stability theory is introduced for error coordination *** last,a simple example is used to verify the proposed method.

关键词： quality control node complex network error tracing error coordination optimization change management

Entrainment of Astrocytic and Neuronal Ca^(2+) Population Dynamics During Information Processing of Working Memory in Mice

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Neuroscience Bulletin 2022年第5期38卷 474-488页

作者： Zhu Lin feng You Ting Li Yijia feng Xinyue zhao Jingjing Yang Zhimo Yao Ying Gao jiang-Fan Chen The Molecular Neuropharmacology Laboratory and the EyeBrain Research Center State Key Laboratory of OphthalmologyOptometry and Visual ScienceSchool of Optometry and Ophthalmology and Eye HospitalWenzhou Medical UniversityWenzhou 325035China

Astrocytes are increasingly recognized to play an active role in learning and memory,but whether neural inputs can trigger event-specific astrocytic Ca^(2+)dynamics in real time to participate in working memory remains unclear due to the difficulties in directly monitoring astrocytic Ca^(2+)dynamics in animals performing ***,using fiber photometry,we showed that population astrocytic Ca^(2+)dynamics in the hippocampus were gated by sensory inputs(centered at the turning point of the T-maze)and modified by the reward delivery during the encoding and retrieval ***,there was a strong inter-locked and antagonistic relationship between the astrocytic and neuronal Ca^(2+)dynamics with a 3-s phase ***,there was a robust synchronization of astrocytic Ca^(2+)at the population level among the hippocampus,medial prefrontal cortex,and *** inter-locked,bidirectional communication between astrocytes and neurons at the population level may contribute to the modulation of information processing in working memory.

关键词： Working memory Ca^(2+)dynamics Astrocyte Neuron Fiber photometry Hippocampus

Attitudes Regarding Influenza Vaccination Among Public Health Workers during COVID-19 Pandemic — China, September 2022

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China CDC weekly 2023年第6期5卷 137-142页

作者： Heya Yi Yanlin Cao Jiemi zhao Binshan jiang Congxuan Bing Zijian feng Weizhong Yang Jiandong Zheng Luzhao feng Chinese Preventive Medicine Association BeijingChina Chinese Academy of Medical Sciences Peking Union Medical CollegeBeijingChina Division of Infectious Disease Chinese Center for Disease Control and PreventionBeijingChina

Summary What is already known about this topic?Public health workers(PHWs)were listed as a priority group recommended for influenza vaccination during the coronavirus disease 2019(COVID-19)*** the drivers of influenza... 详细信息

关键词： vaccine vaccination listed

Msx2 plays a critical role in lens epithelium cell cycle control

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International Journal of Ophthalmology(English edition) 2013年第3期6卷 276-279页

作者： jiang-Yue zhao feng-feng Zhuang Hong-Yan Wang Di Wu Jin-Song Zhang Eye Hospital of China Medical University Department of Ophthalmology the 4~(th) Affiliated Hospital of China Medical University Provincial Key Laboratory of Lens Research Department of Ophthalmology and Doheny Eye Institute Keck School of Medicine University of Southern California Department of General Surgery People's Hospital of Liaoning Province

AIM: To investigate the effects of Msx2 on lens epithelium cell cycle, and evaluate the changes of the proliferation, apoptosis of lens epithelium cells. METHODS: Mice lens epithelium cells were cultured and transfected with pEGFP-Msx2 and control. Msx2-deficient mice (Msx2(-/-)) lens tissue were isolated. Lens tissue and transfected cells were prepared for mRNA extraction using Trizol reagent. CyclinD1 and Prox1 expression were evaluated by real-time RT-PCR. BrdU incorporation and apoptosis rate were investigated by immunofluorescence and flow cytometry analysis. RESULTS: After transfected with pEGFP-Msx2, lens epithelium cells failed to incorporate BrdU and anti - phospho-histone-3 immunofluorescence failed to detect cell nuclei which GFP were positive. Msx2 over expression resulted in increasing apoptosis rate in lens epithelium cells. CyclinD1 and Prox1 expression increased significantly in Msx2 knockout mice by real time RT-PCR quantization and CyclinD1 expression decreased significantly in Msx2overexpressed cell. CONCLUSION: Msx2 has the effect of inhibiting proliferation and differentiation, triggering apoptosis on mice lens epithelium cells.

关键词： Msx2 lens epithelium cell cell cycle

X-ray irradiation-induced degradation in Hf_(0.5)Zr_(0.5)O_(2) fully depleted silicon-on-insulator n-type metal oxide semiconductor field-effect transistors

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Rare Metals 2021年第11期40卷 3299-3307页

作者： Yu-Dong Li Qing-Zhu Zhang Fan-Yu Liu zhao-Hao Zhang feng-Yuan Zhang Hong-Bin zhao Bo Li jiang Yan Key Laboratory of Microelectronics Devices and Integrated Technology Integrated Circuit Advanced Process Center(ICAC)Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Advanced Materials for Smart Sensing GRINM Group Co.LtdBeijing 100088China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China School of Information Science and Technology North China University of TechnologyBeijing 100144China

The n-type ultrathin fully depleted silicon-on-insulator(FDSOI) metal-oxide-semiconductor field-effect transistors(MOSFETs),with a Hf_(0.5)Zr_(0.5)O_(2) high dielectric permittivity(high-k) dielectric as gate insulator,were *** total ionizing dose effects were investigated,and an X-ray radiation dose up to 1500 krad(Si) was applied for both long-and short-channel *** short-channel devices(0.025-0.100 μm) exhibited less irradiation sensitivity compared with the long-channel devices(0.35-16 μm),leading to a 71% reduction in the irradiation-induced drain current growth and a 26% decrease in the shift of the threshold *** was experimentally demonstrated that the OFF mode is the worst case among the three working conditions(OFF,ON and A110) for short-channel ***,the determined effective electron mobility was enhanced by 38% after X-ray irradiation,attributed to the different compensations for charges triggered by radiation between the highk dielectric and buried *** extracting the carrier mobility,gate length modulation,and source/drain(S/D)parasitic resistance,the degradation mechanism on X-ray irradiation was ***,the split capacitance-voltage measurements were used to validate the analysis.

关键词： Total ionizing dose Fully depleted silicon-on-insulator(FDSOI) Metal–oxide–semiconductor field-effect transistor(MOSFET) High-k Hf_(0.5)Zr_(0.5)O_(2)