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| 1 | Understanding the Percolation Effect in Triboelectric Nanogenerator with Conductive Intermediate Layer显示文摘Introducing the conductive intermediate layer into a triboelectric nanogenerator(TENG)has been proved as an efficient way to enhance the surface charge density that is attributed to the enhancement of the dielectric permittivity.However,far too little attention has been paid to the companion percolation,another key element to affect the output.Here,the TENG with MXeneembedded polyvinylidene fluoride(PVDF)composite film is fabricated,and the dependence of the output capability on the MXene loading is investigated experimentally and theoretically.Specifically,the surface charge density mainly depends on the dielectric permittivity at lower MXene loadings,and in contrast,the percolation becomes the degrading factor with the further increase of the conductive loadings.At the balance between the dielectric and percolation properties,the surface charge density of the MXene-modified TENG obtained 350%enhancement compared to that with the pure PVDF.This work shed new light on understanding the dielectric and percolation effect in TENG,which renders a universal strategy for the high-performance triboelectronics. | Binbin Zhang Guo Tian Da Xiong Tao Yang Fengjun Chun Shen Zhong Zhiming Lin Wen Li Weiqing Yang | 2021 | Research2021，，1： | 2 |
| 2 | The impact of climate change on fire risk in Daxing'anling,China显示文摘Daxing'anling is a key region for forest fire prevention in China.Assessing changes in fire risk in the future under multiple climatic scenarios will contribute to our understanding of the influences of climate change for the region and provide a reference for applying adaptive measures for fire management.This study analyzed the changes in fire weather indices and the fire season under four climate scenarios(RCP2.6,RCP4.5,RCP6.0,RCP8.5)for 2021–2050 using data from five global climate models together with observation data.The results showed that the analog data could project the average state of the climate for a given period but were not effective for simulating extreme weather conditions.Compared with the baseline period(1971–2000),the period 2021–2050 was predicted to have an increase in average temperature of 2.02–2.65 °C and in annual precipitation 25.4–40.3 mm,while the fire weather index(FWI) was predicted to increase by6.2–11.2% and seasonal severity rating(SSR) by5.5–17.2%.The DMC(Duff moisture code),ISI(initial spread index),BUI(build-up index),FWI and SSR were predicted to increase significantly under scenarios RCP4.5,RCP6.0,and RCP8.5.Furthermore,days with high or higher fire danger rating were predicted to be prolonged by 3–6 days,with the change in the southern region being greater under scenarios RCP4.5,RCP6.0,and RCP8.5. | Xiaorui Tian Lifu Shu Mingyu Wang Fengjun Zhao | 2017 | Journal of Forestry Research2017，28，5： | 2 |
| 3 | Characteristics of near-surface-core optical fibers 显示文摘 | GUAN Chunying YUAN Libo TIAN Fengjun | 2011 | Journal of LightwaveTeehnology(S0733-8724)2011，29，19： | 1 |
| 4 | Educational action research in foreign languages teaching: Its importance at Guyuan Teachers' College and in China as well显示文摘 | Tian Fengjun and Laidlaw | 2002 | Journal of Guyuan Teachers College2002，，2： | 1 |
| 5 | Supercritical extracts of forest fuels in Great Xing'an Mountains显示文摘Extracts are important components of fuels.Fatty-extracts with high heating value(HV) are hypothesized by researchers as positively related to the HV of fuels.The Soxhlet extractor is typically used to extract fatty-extracts but it has shortcomings,including long processing time(8–10 h) and the requirement for large amounts of organic solvent.Supercritical extraction is an alternate and useful technique for extraction of natural products.However,published studies rarely discuss the relationship between extracts and HV.In this study,we assessed the supercritical extracts(Su E) of forest fuels in the Great Xing'an Mountains.Our results indicated that the optimum conditions for extraction of Su Es were40–60 mesh,40–50 MPa,45 °C,80 min and a CO_2 flow rate of 1.5–2.0 dm^3/min.The Soxhlet extracts contents and the Su E contents were all related to HV.However,R^2 of the coniferous samples(0.8499) and needle samples(0.9722) demonstrated that the correlation between HV and the Su E content was closer.We conclude that supercritical fatty-extracts provide a useful index of the HV of fuels,especially coniferous fuels.Su E data can be used in fire management,for example to estimate the rate of fire spread or fire intensity. | Fengjun Zhao Mingyu Wang Lifu Shu Xiaorui Tian Kezhen Liu | 2016 | Journal of Forestry Research2016，27，5： | 1 |
| 6 | Discussion of the Mode and Mechanism of Oil and Gas Accumulation in the Nanbaxian Pool in the North of the Qaidam Basin显示文摘因为在挂的墙和一个差错的矿脉基卒下盘之间的油和煤气的累积状况的差别,有古怪累积机制,油和气体主要在 Nanbaxian 水池在地下室差错的挂的墙中,但是在浅分开差错的矿脉基卒下盘存在。Nanbaxian 水池的油和气体来自在 Nanbaxian 水池的南方定位的 Yibei 消沉的成熟侏罗记烃来源岩石。第一,油和气体通过不顺从和地下室差错在地下室差错的挂的墙的陷井积累了,并且变成了一些主要深水池;然后,在以后构造的运动形成了的浅分开差错闯入了深主要的水池,它以后沿着地下室差错和浅分开差错和发展向上引起了油和煤气的移植进一些第二等的油和煤气的水池。Nanbaxian 油和煤气的累积的历史能作为差错控制的 syndepositional 胀起连续地被总结;挑选烃来源岩石;不顺从和差错作为迁居隧道;象动态力量的快活,过压和构造应力;油和气体的多级式的移植和累积;并且最后油和煤气的累积的一个重叠双地板模式。在 Qaidam 盆的北方的最重要的探险目标是浅分开差错在矿脉基卒下盘与主要水池连接的陷井。 | Li Fengjun Luo Qun Chen Shulan Liu Yunhon Tian Fenghua | 2005 | Petroleum Science2005，2，4： | 1 |
| 7 | Monitoring Forest Fire with MODIS-NDVI Images in Beijing显示文摘Fuel moisture monitoring is an important component of fire danger rating system in fire management. This paper describes the application of NDVI images in monitoring potential fire danger and analyses the relationship between MODIS-NDVI and fire weather index. The series of weather data in Beijing are used in this analysis including fire seasons in spring during 2004 to 2005. Canadian Fire Weather Index (FWI) is selected in this study, because it can properly estimate moisture conditions of live fuel. Fine fuel moisture, drought code and FWI values are generated by using the squared inverse distance algorithm. Strong correlations have previously been observed between FWI variables and NDVI data. The MODIS-NDVI images can be used in fire management as component related with live fuel moisture and fire danger. | TIAN Xiaorui SHU Lifu WANG Mingyu ZHAO Fengjun | 2006 | Chinese Forestry Science and Technology2006，5，4： | 0 |
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