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Rare earth doping effect on the optical properties of several fluorescence materials

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Science China(Physics,Mechanics & Astronomy) 2012年第7期55卷 1235-1239页

作者： WANG ShuTao WANG DongSheng WANG yutian PAN WeiWei College of Electrical Engineering Yanshan UniversityQinhuangdao 066004China hebei Engineering University Mechanical and Electrical Institute Handan 056038China

Based on the optical properties of rare earth fluorescence materials, a set of fluorescence optical fiber systems was designed. The system selects the emitting LED, which is economical and practical as a light source. The experiment of the emission and excitation optical spectrum, decay curve of fluorescence and residuals for several sensitive materials confirms the match of Y2O2S:Eu using the light source and the feasibility of the system. The rare earth material Y2O2S:Eu is selected as the material candidate for being the most sensitive.

关键词： physics fluorescence materials optical fiber optical spectrum

Changes of phenotype and function of human CD4^(+)CD25^(-) T cells induced by transfection of Foxp3

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Frontiers of Medicine 2008年第4期2卷 366-369页

作者： Kui WU yutian BI Yaoli WANG Changzheng WANG Institute of Respiratory Disease Xinqiao HospitalThird Military Medical UniversityChongqing 400037China

The aim of this paper is to explore the effects of transfection of Foxp3 gene on the phenotype and function of naive CD4^(+)T *** pMSCV-Foxp3 retroviral vec-tor encoding Foxp3 gene was transduced into the PT67 packaging cell ***-containing supernatant was applied to differentiate CD4^(+)CD25^(-) T *** resulting cells were sorted with flow *** expressions of CD25,CD127,CTLA-4 and the proliferation of trans-fected T cells were *** effect of transfected CD4^(+)T cells on the proliferation and cytokine production of CD4^(+)CD25^(-) T cells was ***3-gene trans-fected CD4^(+)T cells could express Foxp3 and transfection of Foxp3 gene up-regulated the expressions of CD25 and CTLA-4,but down-regulated CD127 *** transfection,the proliferation of CD4^(+)T cells was *** T cells inhibited the proliferation of CD4^(+)CD25^(-) T ***4^(+)CD25^(-) T cells acquired a reg-ulatory phenotype and function after it was transduced with the Foxp3 *** suggested a key role of Foxp3 in the generation of CD4^(+)CD25^(+) regulatory T cells.

关键词： Forkhead transcription factors FOXP3 pro-tein,human T-lymphocytes,regulatory Retroviridae

Suppression of Plasma Bubbles over South America under Weak Geomagnetic Perturbations

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Journal of Geodesy and Geoinformation Science 2023年第4期6卷 48-69页

作者： Xunzhe YIN Dongjie YUE Changzhi ZHAI yutian CheN Xiaoyun CheNG School of Earth Sciences and Engineering Hohai UniversityNanjing 210098China

During a long-term Equatorial Plasma Bubbles(EPBs)occurrence between October 2020 and March 2021,a significant EPB suppression event was identified on November 22 and the observations from multi-instrument have been utilized to investigate this ***-scale Observations of the Limb and Disk(GOLD)satellite observed prominent EPBs between 23:40 UT and 23:55 UT during the long-term occurrence ***,no dark stripes representing EPBs were observed on November 22,and the Equatorial Ionization Anomaly(EIA)structure remained *** Total Electron Content(TEC)maps show that these EPBs appeared in the region between 35°W and 65°W longitudes and the magnitudes of the TEC loss in EPBs regions were about 20 *** for 22 November,the S4 index was consistently greater than 0.6 throughout November,indicating significant ionospheric *** Rate Of TEC Index(ROTI)maps revealed that the spatial extent and intensity of EPBs increased after their suppression,and the EPBs were locally *** swarm electron density measurements indicated that the variation amplitudes of EPBs at 510 km altitude were approximately 3 to 5 times larger than that at 460 km *** impact region of EPBs at 510 km was between 15°S and 20°N latitudes,while at 460 km,it was between 0°and 17°N *** the period of EPB suppression,the average h’f at three ionosonde stations decreased by about 50 km,and the vertical drift velocity(V z)approached~0 m/s while it was more than 20 m/s during the long-term occurrence.

关键词： plasma bubble ionospheric scintillation weak geomagnetic perturbations

Enhanced flexural performance of epoxy polymer concrete with short natural fibers

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Science China(Technological Sciences) 2018年第8期61卷 1107-1113页

作者： HU Bin ZHANG NanLi LIAO yutian PAN ZhiWei LIU YiPing ZHOU LiCheng LIU ZeJia JIANG ZhenYu School of Civil Engineering and Transportation State Key Laboratory of Subtropical Building Science South China University of Technology The State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

Epoxy polymer concrete(EPC) has found various applications in civil engineering. To enhance the flexural performance of EPC,two kinds of short natural fibers with high specific strength(sisal fibers and ramie fibers) have been incorporated into EPC. The results of mechanical tests show that a small loading of natural fibers(0.36 vol%) can significantly increase the flexural strength of EPC by 25.3%(ramie fibers) or 10.4%(sisal fibers). This enhancement is achieved without any sacrifice of compressive strength of EPC. The reinforcing effects of short natural fibers on the flexural properties and compressive properties of EPC decrease with further increase in fiber content, due to the insufficient wetting of fibers by epoxy resin which results in poor interfacial bonding. The reinforcing mechanisms of short natural fibers are explored according to the observation of fracture surfaces and micromechanical modelling. It is found that the parallel model based on the rule of mixture can be a good approximation to describe the improvement in flexural strength of the short natural fiber reinforced EPC at low fiber volume fractions.

关键词： epoxy polymer concrete (EPC) natural fibers fiexural strength micromechanics models

Is Solar Wind electron precipitation a source of neutral heating in the nightside Martian upper atmosphere?

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Earth and Planetary Physics 2021年第1期5卷 1-10页

作者： LongKang Dai Jun Cui DanDan Niu Hao Gu yutian Cao XiaoShu Wu HaiRong Lai Planetary Environmental and Astrobiological Research Laboratory(PEARL) School of Atmospheric SciencesSun Yat-sen UniversityZhuhai Guangdong 519082China Key Laboratory of Lunar and Deep Space Exploration National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHefei 230031China Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen Guangdong 518055China

Solar Wind(SW)electron precipitation is able to deposit a substantial amount of energy in the nightside Martian upper atmosphere,potentially exerting an influence on its thermal *** study serves as the first investigation of such an issue,with the aid of the simultaneous measurements of both neutral density and energetic electron intensity made on board the recent Mars Atmosphere and Volatile Evolution(MAVEN)*** report that,from a statistical point of view,the existing measurements do not support a scenario of noticeable neutral heating via SW electron ***,during 3%−4%of the MAVEN orbits for which data are available,strong correlation between nightside temperature and electron intensity is observed,manifested as collocated enhancements in both parameters,as compared to the surrounding *** addition,our analysis also indicates that neutral heating via SW electron precipitation tends to be more effective at altitudes below 160 km for integrated electron intensities above 0.01 ergs·cm^−2·s^−1 over the energy range of 3−450 *** results reported here highlight the necessity of incorporating SW electron precipitation as a heat source in the nightside Martian upper atmosphere under extreme circumstances such as during interplanetary coronal mass ejections.

关键词： Mars Solar Wind upper atmosphere MAVEN

The burgeoning importance of PIWI-interacting RNAs in cancer progression

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Science China(Life Sciences) 2024年第4期67卷 653-662页

作者： Xinpei Deng Tianle Liao Jindong Xie Da Kang Yiwei he Yuying Sun Zhangling Wang Yongluo Jiang Xuan Miao Yixuan Yan Hailin Tang Lewei Zhu yutian Zou Peng Liu State Key Laboratory of Oncology in South China Guangdong Provincial Clinical Research Center for CancerSun Yat-sen University Cancer CenterGuangzhou 510060China School of Medicine Sun Yat-sen UniversityShenzhen 518107China Key Laboratory of Cardiovascular and Cerebrovascular Medicine Nanjing Medical UniversityNanjing 211166China Guanghua School of Stomatology Sun Yat-sen UniversityGuangzhou 510062China The First People’s Hospital of Foshan Foshan 528000China

PIWI-interacting RNAs(pi RNAs)are a class of small noncoding RNA molecules that specifically bind to piwi protein family members to exert regulatory functions in germ *** studies have found that pi RNAs,as tissue-specific molecules,both play oncogenic and tumor suppressive roles in cancer progression,including cancer cell proliferation,metastasis,chemoresistance and ***,the atypical manifestation of pi RNAs and PIWI proteins in various malignancies presents a promising strategy for the identification of novel biomarkers and therapeutic targets in the diagnosis and management of ***,the precise functions of pi RNAs in cancer progression and their underlying mechanisms have yet to be fully *** review aims to examine current research on the biogenesis and functions of pi RNA and its burgeoning importance in cancer progression,thereby offering novel perspectives on the potential utilization of pi RNAs and piwi proteins in the management and treatment of advanced cancer.

关键词： PIWI-interacting RNAs/piRNAs cancer progression metastasis chemoresistance stemness

Synergistic Influences of Kinetic Effects from Thermal Particles and Fast Ions on Internal Kink Mode

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Chinese Physics Letters 2021年第8期38卷 67-72页

作者： yutian Miao G.Z.Hao Yue Liu H.D.he W.Chen Y.Q.Wang A.K.Wang M.Xu Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China Southwestern Institute of Physics Chengdu 610041China

The kinetic effects of thermal particles and fast ions on internal kink(IK)mode are numerically investigated by the MHD-kinetic hybrid code *** is shown that either thermal particles or fast ions have stabilizing influence on ***,the former can not fully stabilize IK,and the later can suppress the *** addition,the synergistic effect from thermal particles and fast ions induces more stronger damping on *** kinetic effects from particles significantly raise the critical value of poloidal beta(βpcrit)for driving IK in the toroidal *** implies a method of controlling IK or sawtooth in the high-βp discharge scenario of *** is noted that,at the q=1 rational surface,mode structure becomes more sharp due to the self-consistent modification by particles’kinetic effect.

关键词： kinetic Internal mode

The Technological Innovation Journey of Hisense Group

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Frontiers of Business Research in China 2012年第1期6卷 134-155页

作者： Jingyue Xu Yunxia Feng Shubin Jiao yutian Zhu Sctlool of Business Renmin University of ChinaBeijing 100872China School of Business Renmin University of ChinaBeijing 100872China

This case illustrates key innovations that took place in Hisense Group, one of the leading companies in the electronic appliances industry in China, from 1990s to 2010. Several factors contributed to its leading position, including strategic positioning, consistent technological innovation over decades, and an efficient administrative system. Since 1992, Hisense has paid close attention to technological innovation. It makes it clear that R＆D plays a dominant role in competition. Hisense has continuously invested heavily in R＆D and restructured its R＆D administrative system, including the organizational framework, incentive mechanisms, project management and teamwork. Hisense＇s strategy has resulted in major technological innovations. Hiview chip is a technological breakthrough, which helps the company gain competitive advantages.

关键词： Hisense technological innovation process orientation Hiview China

Aspects of ultra-high voltage half-wavelength power transmission technology

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Global Energy Interconnection 2018年第1期1卷 96-102页

作者： yutian Liu Hao Tian Zhengzhong Liu Xiaohui Qin Collaborative Innovation Center for Global Energy Interconnection of Shandong Province (Shandong University) China Electric Power Research Institute

The necessity of large-scale and long-distance power transmission in future energy development is analyzed and some application scenarios of ultra-high voltage(UHV) half-wavelength transmission(HWLT) system are presented in the paper. Steady state and transient characteristics of half-wavelength transmission lines are reviewed in detail. The characteristics of UHV HWLT are very different from those of conventional UHV transmission mode, especially the overvoltage problem. To analyze the particularity and key techniques of UHV HWLT, current research results are summarized from simulation method, steady-state voltage control, relay protection, tuning network, secondary arc and overvoltage suppression, economic evaluation and engineering design. Some future research directions are also briefly addressed.

关键词： Global Energy Interconnection Half-wavelength Ultra-high voltage transmission Power system