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8篇 您的检索式:作者名="Linjun Cheng"
    题名 作者 年代 出处 被引量
1Regionalization based on spatial and seasonal variation in ground-level ozone concentrations across China显示文摘Owing to the vast territory of China and strong regional characteristic of ozone pollution,it's desirable for policy makers to have a targeted and prioritized regulation and ozone pollution control strategy in China based on scientific evidences. It's important to assess its current pollution status as well as spatial and temporal variation patterns across China.Recent advances of national monitoring networks provide an opportunity to insight the actions of ozone pollution. Here, we present rotated empirical orthogonal function(REOF)analysis that was used on studying the spatiotemporal characteristics of daily ozone concentrations. Based on results of REOF analysis in pollution seasons for 3 years' observations, twelve regions with clear patterns were identified in China. The patterns of temporal variation of ozone in each region were separated well and different from each other, reflecting local meteorological, photochemical or pollution features. A rising trend in annual averaged Eight-hour Average Ozone Concentrations(O_3-8 hr) from 2014 to 2016 was observed for all regions, except for the Tibetan Plateau. The mean values of annual and 90 percentile concentrations for all 338 cities were 82.6 ± 14.6 and 133.9 ± 25.8 μg/m^3,respectively, in 2015. The regionalization results of ozone were found to be influenced greatly by terrain features, indicating significant terrain and landform effects on ozone spatial correlations. Among 12 regions, North China Plain, Huanghuai Plain, Central Yangtze River Plain, Pearl River Delta and Sichuan Basin were realized as priority regions for mitigation strategies, due to their higher ozone concentrations and dense population.Linjun Cheng Shuai Wang Zhengyu Gong Hong Li Qi Yang Yeyao Wang 2018Journal of Environmental Sciences2018,30,5:14
2Carbonatites in China:A review for genesis and mineralization显示文摘Carbonatites 是通常与象 REE, Cu,和 P 那样的经济地珍贵的物质的累积有关。在到联系硅酸盐岩石的 carbonatites 和他们的关系的起源上的争论是进行中的大约 45 年了。全球,岩石表示特性地比沉积碳酸盐岩石在 Ba, Sr 和 REE 显示更多的 geochemical 丰富。然而,因为第二等的矿物质效果, carbonatites geochemical 特征被争论。从在在中国的 Qinling, Panxi 区域,和 Bayan Obo 的 carbonatites 的形成岩石的碳酸盐显示出从 LREE 丰富到扁平的模式的 REE 分发模式。他们被超过 10 比第二等的碳酸盐的高预定的一个 Sr 内容描绘。从 Bayan Obo H8 白云石云石的纹理粗糙、有细密纹理的白云石也显示出类似的高 Sr 丰富,显示他们具有火的起源。在中国 carbonatites 的一些碳酸盐显示出 REE (特别 HREE ) 整个岩石的类似于那些的内容和分布模式。这些恼人的 carbonatites 显示相对 high-Si 降低在磅和红外之间的铂组元素和更强壮的分别挤出的 carbonatite。这显示很恼人的 carbonatites 可以是碳酸盐堆积。在 Panxi 区域的 Maoniuping 和 Daluxiang 是大 REE 沉积物。热水的荧石矿石静脉发生在 carbonatite 身体外面并且是在 wallrock 的 emplaced 正长岩。在 Maoniuping 的荧石有类似于 carbonatite 的 Sr 和 Nd 同位素。Daluxiang 荧石在 Maoniuping 显示出与那些不同的 Sr 和 REE 作文。差别被 carbonatites 和形成岩石的碳酸盐反映,显示那个 REE 矿化作用与 carbonatites 有关。碳酸盐矿物质的 cumulate 进程从 LREE 由于为在碳酸盐和 carbonatite 之间的 REE 的系数融化的低分区和增加在 volatiles 和 LREE 使 fractionated 液体富有到 HREE。导出 carbonatite 的液体与 wallrock 交往了形成 REE 矿石静脉。发生在 Bayan Obo orebodies 附近的 carbonatite 女同性恋的数量可以支持一样的矿化作用模型,即液体从 carbonatite 女同性恋演变,这与 H8 白云石大理石反应了,并且这样纹理粗糙、有细密纹理的白云石的不同 REE 和同位素作文可能与反应过程有关。Cheng Xu Linjun Wang Wenlei Song Min Wu 2010Geoscience Frontiers2010,1,1:10
3Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5-MoO3/TiO2-CeO2 catalyst显示文摘The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition behavior and SO2 poisoning over V2 O5-MoO3/TiO2 catalysts modified with CeO2 and SiO2 were investigated.By the means of characterization analysis,it was found that the addition of SiO2 into VMo/Ti-Ce had an impact on the interaction existed between catalyst surface atoms and NH4 HSO4.Temperatureprogrammed methods and in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments indicated that the doping of SiO2 promoted the decomposition of deposited NH4 HSO4 on VMo/Ti-Ce catalyst surface by reducing the thermal stability of NH4 HSO4 and enhancing the NH4 HSO4 reactivity with NO in low temperature.And this improvement may be the reason for the better catalytic activity than VMo/Ti-Ce in the case of NH4 HSO4 deposition.Accompanied with cerium sulfate species generated over catalyst surface,the conversion of SO2 to SO3 was inhibited in SiCe mixed catalyst.The addition of SiO2 could promote the decomposition of cerium sulfate,which may be a potential strategy to enhance the resistance of SO2 poisoning over CeO2-modifed catalysts.Chengqiang Zheng Teng Cheng Linjun Yang Hao Wu Hongmei Fan 2020Journal of Environmental Sciences2020,32,5:6
4Fractal Uniform Circular Arrays Based Multi-Orbital-Angular-Momentum-Mode Multiplexing Vortex Radio MIMO显示文摘A radio wave driven by Orbital angular momentum(OAM) is called a vortex radio and has a helical wavefront. The differential helical wavefronts of several vortex radios are closely related to their topological charges or mode numbers. In physics, two or more radio waves with different mode numbers are orthogonal to their azimuth angles. With the development of radio communication technologies, some researchers have been exploring the OAM-based multi-mode multiplexing(multi-OAM-mode multiplexing) technologies in order to enhance the channel spectrum efficiency(SE) of a radio communication system by using the orthogonal properties of vortex radios. After reviewing the reported researches of OAM-based radio communication, we find that some breakthroughs have been made in the combination of OAM and traditional Multi-Input-Multi-Output(MIMO). However, the existing technology is not sufficient to support OAM-based MIMO system to achieve maximum the channel SE. To maximize the spectrum efficiency of OAM-based MIMO system, we present a reused multi-OAM-mode multiplexing vortex radio(RMMVR) MIMO system, which is based on fractal uniform cir-cular arrays(UCAs). The scheme described in this study can effectively combine multiOAM-mode multiplexing with MIMO spatial multiplexing. First, we present the generation of RMMVR MIMO signals. Second, under line-of-sight(LOS) propagation conditions, we derive the channels of the RMMVR MIMO system. Third, we separate the RMMVR MIMO signals using an orthogonal separation method based on full azimuth sampling. Finally, we introduce the method for calculating the channel capacity of the RMMVR MIMO system. Theoretical analysis shows that the scheme proposed in this study is feasible. Moreover, the simulation results show that spatial and mode diversity are obtained by exploiting fractal UCAs. However, to enhance the channel SE of RMMVR MIMO system, an interference cancellation method needs to be introduced for zero-mode vortex radios, and some methods of multi-OAM-mode beams convergence and mode power optimization strategy should be introduced in the future.Linjun Zhao Hailin Zhang Wenchi Cheng 2018China Communications2018,15,9:2
5The origin of enriched mantle beneath North China block : Evidence from young carbonatites 显示文摘Xu Cheng Taylor R N Kynieky J Anton R C Song Wenlei Wang Linjun 2011Lithos2011,127,:1
6Controlling exciton-exciton annihilation in WSe_(2) bilayers via interlayer twist显示文摘The twist angle between two van der Waals coupled monolayers has emerged as a new and powerful degree of freedom for engineering physical properties of semiconductor homo-and hetero-bilayers.While the interlayer twist has shown prominent effect on electronic and optical properties of transition metal dichalcogenide(TMD)bilayers,it remains unclear how it could be used to manipulate the exciton dynamics,especially exciton-exciton annihilation(EEA)process which is the dominant energy loss channel in TMDs under moderate to high exciton density due to strong Coulomb interaction.Herein,we show that the twist angle in TMD bilayers can act as an effective knob to control the EEA process.Specifically,EEA rate constant increases from 1° twisted WSe_(2) bilayers(0.026 cm^(2)/s)by more than twice to 32° twisted bilayers(0.053 cm2/s)and then drops again in 60° twisted bilayers(0.019 cm^(2)/s).This twist-angle dependence can be attributed to the energy difference between indirect and direct excitons arising from the interlayer interaction.Our work opens up the possibility of artificially managing the exciton dynamics in TMD materials for optoelectronic applications via interlayer twist angle.Yuzhong Chen Bichuan Cao Cheng Sun Zedong Wang Hongzhi Zhou Linjun Wang Haiming Zhu 2022Nano Research2022,15,5:1
7Hydrocarbon accumulation characteristics in basement reservoirs and exploration targets of deep basement reservoirs in onshore China显示文摘Based on the global basement reservoir database and the dissection of basement reservoirs in China,the characteristics of hydrocarbon accumulation in basement reservoirs are analyzed,and the favorable conditions for hydrocarbon accumulation in deep basement reservoirs are investigated to highlight the exploration targets.The discovered basement reservoirs worldwide are mainly buried in the Archean and Precambrian granitic and metamorphic formations with depths less than 4500 m,and the relatively large reservoirs have been found in rift,back-arc and foreland basins in tectonic active zones of the Meso-Cenozoic plates.The hydrocarbon accumulation in basement reservoirs exhibits the characteristics in three aspects.First,the porous-fractured reservoirs with low porosity and ultra-low permeability are dominant,where extensive hydrocarbon accumulation occurred during the weathering denudation and later tectonic reworking of the basin basement.High resistance to compaction allows the physical properties of these highly heterogeneous reservoirs to be independent of the buried depth.Second,the hydrocarbons were sourced from the formations outside the basement.The source-reservoir assemblages are divided into contacted source rock-basement and separated source rock-basement patterns.Third,the abnormal high pressure in the source rock and the normal–low pressure in the basement reservoirs cause a large pressure difference between the source rock and the reservoirs,which is conducive to the pumping effect of hydrocarbons in the deep basement.The deep basement prospects are mainly evaluated by the factors such as tectonic activity of basement,source-reservoir combination,development of large deep faults(especially strike-slip faults),and regional seals.The Precambrian crystalline basements at the margin of the intracontinental rifts in cratonic basins,as well as the Paleozoic folded basements and the Meso-Cenozoic fault-block basements adjacent to the hydrocarbon generation depressions,have favorable conditions for hydrocarbon accumulation,and thus they are considered as the main targets for future exploration of deep basement reservoirs.WANG Zecheng JIANG Qingchun WANG Jufeng LONG Guohui CHENG Honggang SHI Yizuo SUN Qisen JIANG Hua ABULIMITI Yiming CAO Zhenglin XU Yang LU Jiamin HUANG Linjun 2024Petroleum Exploration and Development2024,51,1:0
8SET1A催化YAP甲基化修饰调控YAP细胞核转运和促进肿瘤发生显示文摘文章简介YAP作为Hippo信号通路主要效应因子之一,在Hippo通路受抑的条件下,从细胞质转运至细胞核调控基因表达和促进肿瘤发生。虽然YAP锚定在细胞质中的调控机制已经被广泛研究,但是YAP激活后入核在细胞核中持续积累的分子机制并不十分清楚。方兰 滕鸿琦 王益林 廖光红 Linjun Weng Yaxu Li Xinbo Wang Jiali Jin Chenchen Jiao Lei Chen Xiaoping Peng Jiayu Chen Yongzhi Yang Houqin Fang Dongyan Han Cheng Li Xueling Jin Shihao Zhang Zhongchen Liu Min Liu Qing Wei Lujian Liao Xin Ge Bin Zhao Dawang Zhou HuanLong Qin Jun Zhou 王平 2019科学新闻2019,0,2:0
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