维普中文期刊产品整合服务
231篇 您的检索式:作者名="Liguang"
    题名 作者 年代 出处 被引量
1EW-trending uplifts along the southern side of the central segment of the Altyn Tagh Fault, NW China: Insight into the rising mechanism of the Altyn Mountain during the Cenozoic显示文摘The Altyn Tagh Fault and the Altyn Mountain define respectively the tectonic and geographical northern edges of the Tibetan Plateau, and figure prominently in the growth and rising mechanism of the plateau. The rhombus-shaped Altyn Mountain has long been thought to have an intimate relation with the Altyn Tagh Fault; however, its formation mechanism remains unclear and debatable. In this paper, we focus on the EW-trending uplifts in the Altyn Mountain, and investigated three Cenozoic sedimentary sections in the vicinity of the EW-trending uplifts located along the southern side of the central segment of the Altyn Tagh Fault. Magnetostratigraphy and pollen analysis were used to constrain ages of the sediments. Clast composition of conglomerate and paleocurrents obtained from clast imbrications were applied to determine the provenance. We also established a geological section parallel to the Altyn Tagh Fault on sedimentary facies across the northwestern Qaidam Basin. The results indicate that these en-echelon EW-trending uplifts formed as early as ca. 36 Ma and were preferred to be under the control of basal shear of the Altyn Tagh Fault in the middle-lower crust, symbolizing the early uplift of the Altyn Mountain during the Cenozoic. Left-slip along the Altyn Tagh Fault occurring during the Miocene and afterwards displaced and altered these uplifts, shaping the Altyn Mountain to its present fabric.WU Lei XIAO AnCheng WANG LiQun MAO LiGuang WANG Liang DONG YouPu XU Bo 2012Science China Earth Sciences2012,55,6:21
2Monitoring the concentration of N_2O in the Fildes Peninsula, maritime Antarctica显示文摘Gases in the marine boundary layer in Fildes Peninsula, maritime Antarctica were sampled and analyzed for the first time. Sampling sites included areas covered by moss and lichen growth, penguin colonies and an area where scientific research stations are located. A total of 211 samples were analyzed for N2O concentrations, with an average of (321.33±3.07) nL/L. This is above the global average value of 314 nL/L. It is found that the N2O concentrations evidently increase during the summer months. Concentrations around the research stations are higher than at remote areas, indicating a potential source from human activities on the island. N2O concentrations at a large penguin colony on Barton Peninsula are the highest among the sampled areas. This may explain why N2O concentrations in Fildes Peninsula are higher than the global average. Our preliminary conclusions are that human activities and emissions from penguin dropping-amended soil and vegetation soil constitute the major sources of N2O in theSUN Liguang, XIE Zhouqing, ZHAO Junlin, XING Guangxi, SHI Shulian & Du LijuanInstitute of Polar Environment, University of Science and Technology of China, Hefei 230026, China Institute of Environmental Science, Beijing Normal University, Beijing 100875, China Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 2 10008, China 2000Chinese Science Bulletin2000,45,21:21
3Idealized Numerical Simulations of Tropical Cyclone Formation Associated with Monsoon Gyres显示文摘Monsoon gyres have been identified as one of the important large-scale circulation patterns associated with tropical cyclone(TC)formation in the western North Pacific.A recent observational analysis indicated that most TCs form near the center of monsoon gyres or at the northeast end of the enhanced low-level southwesterly flows on the southeast–east periphery of monsoon gyres.In the present reported study,idealized numerical experiments were conducted to examine the tropical cyclogenesis associated with Rossby wave energy dispersion with an initial idealized monsoon gyre.The numerical simulations showed that the development of the low-level enhanced southwesterly flows on the southeast–east periphery of monsoon gyres can be induced by Rossby wave energy dispersion.Mesoscale convective systems emerged from the northeast end of the enhanced southwesterly flows with mid-level maximum relative vorticity.The simulated TC formed in the northeast of the monsoon gyre and moved westward towards the center of the monsoon gyre.The numerical experiment with a relatively smaller sized initial monsoon gyre showed the TC forming near the center of the initial monsoon gyre.The results of the present study suggest that Rossby wave energy dispersion can play an important role in TC formation in the presence of monsoon gyres.LIANG Jia WU Liguang ZONG Huijun 2014Advances in Atmospheric Sciences2014,31,2:13
4Spatial-temporal patterns of major ion chemistry and its controlling factors in the Manasarovar Basin, Tibet显示文摘因为它的唯一的地理环境,在南部的西藏的 Manasarovar 盆,在佛教被认为一块神圣陆地,引起了国际学术注意。在这研究,基于 43 水里的主要离子集中的实际大小,样品在年期间收集了 2005 和 2012,我们全身地在湖和 inflowing 河分析了水化学和它的控制因素的空间时间的模式。结果表明在 Manasarovar 盆的水是稍微碱的,与在 7.47.9 之间变化的 pH。分别地,在湖和河水的全部的溶解固体(TDS ) 的数量是约 325.4 和 88.7 mg/l 在西藏的高原在大多数表面水里比那降低。因为成为蒸气的结晶化的长期的效果,在湖, Na <啜class=“ a-plus-plus ”>+和 HCO <潜水艇class=“ a-plus-plus ”> 3 <啜class=“ a-plus-plus ”>有最高的集中,为全部的阳离子和阴离子内容中的46.8%个和86.8%的财务。在 inflowing 河里,然而,主导的离子是 Ca < 啜 class= “ a-plus-plus ” >2+ 和 HCO < 潜水艇 class= “ a-plus-plus ” > 3 < 啜 class= “ a-plus-plus ” > 为全部的阳离子和阴离子内容中的 59.6% 个和 75.4% 的 , 财务。水交换为如此的一个大湖是不够的,导致离子作文的一个显著空间变化。分别地湖,离子集中在湖的另外的方面上在比那显著地高的北方方面上有几条大 inflowing 河,与 468.9 和 254.9 mg/l 的 TDS。在复杂环境的影响下面,在水化学的空间变化在河里是甚至更重要的,与展出一个更高离子的内容的 upstreams。臼齿的比率在之间( Ca <啜class=“ a-plus-plus ”>2+ +Mg2+)并且( Na <啜class=“ a-plus-plus ”>+ +K+)比 1.0 高得多,表明水里的离子的主要来源是捱过的碳酸盐。尽管自然过程例如捱过的摇滚乐,是在盆控制主要离子化学的主要因素,在未来,我们需要对人为的影响给予更多的注意。YAO Zhijun WANG Rui LIU Zhaofei WU Shanshan JIANG Liguang 2015Journal of Geographical Sciences2015,25,6:11
5Gold immunochromatographic sensor for the rapid detection of twenty-six sulfonamides in foods显示文摘一个金 immunochromatographic 传感器(GICS ) 在蜂蜜样品为 26 硫安类药剂的快速的察觉被开发。传感器基于能认出所有 26 硫安类药剂的组特定的 monoclonal 抗体(mAb ) 。三 haptens (1 与 thiazole 包围的 hapten, 2 与苯包围的 hapten,和 3 与直碳锁住的 hapten ) 被用于抗原准备。与 hybridoma 技术,组特定的 mAb 与 50% 最大的禁止的集中被屏蔽(对 sulfathizole (STZ ) 和从 0.08 ~ 90.18 ng/mL 的另外的 25 类似物的 IC 50) 。单音分散金 nanoparticles 与 mAb 被结合开发侧面的 immunochromatographic 长带。0.1 g/mL 的标记的抗体集中和在测试线的 0.2 g/mL 的涂层抗原集中为长带准备被选择。在优化条件,为 STZ 的集中的察觉( vLOD )的视觉限制, sulfamethoxazole , sulfamethizole ,磺胺嘧啶, sulfamerazine , sulfadimethoxine , sulfamonomethoxine , sulfameter , sulfamethoxypyridazine ,和 sulfachloropyridazine 下面是 5 , 0.25 , 0.25 , 10 , 5 , 10 , 25 , 2.5 , 5 , 0.25 ,和 10 g/kg 分别地。在蜂蜜样品的扫描仪分析为 26 硫安类药剂的察觉揭示了好性能。商业蜂蜜样品与传感器被测试,积极结果与高效的液体层析被证实。建议脱衣传感器在爱人样品为硫安类药剂污染物质的快速、可靠的决心提供一个方便方法。Yanni Chen Liqiang Liu Liguang Xu Shanshan Song Hua Kuang Gang Cui Chuanlai Xu 2017Nano Research2017,10,8:11
6Major Modes of Short-Term Climate Variability in the Newly Developed NUIST Earth System Model(NESM)显示文摘A coupled earth system model(ESM) has been developed at the Nanjing University of Information Science and Technology(NUIST) by using version 5.3 of the European Centre Hamburg Model(ECHAM), version 3.4 of the Nucleus for European Modelling of the Ocean(NEMO), and version 4.1 of the Los Alamos sea ice model(CICE). The model is referred to as NUIST ESM1(NESM1). Comprehensive and quantitative metrics are used to assess the model's major modes of climate variability most relevant to subseasonal-to-interannual climate prediction. The model's assessment is placed in a multi-model framework. The model yields a realistic annual mean and annual cycle of equatorial SST, and a reasonably realistic precipitation climatology, but has difficulty in capturing the spring–fall asymmetry and monsoon precipitation domains. The ENSO mode is reproduced well with respect to its spatial structure, power spectrum, phase locking to the annual cycle, and spatial structures of the central Pacific(CP)-ENSO and eastern Pacific(EP)-ENSO; however, the equatorial SST variability,biennial component of ENSO, and the amplitude of CP-ENSO are overestimated. The model captures realistic intraseasonal variability patterns, the vertical-zonal structures of the first two leading predictable modes of Madden–Julian Oscillation(MJO), and its eastward propagation; but the simulated MJO speed is significantly slower than observed. Compared with the T42 version, the high resolution version(T159) demonstrates improved simulation with respect to the climatology, interannual variance, monsoon–ENSO lead–lag correlation, spatial structures of the leading mode of the Asian–Australian monsoon rainfall variability, and the eastward propagation of the MJO.CAO Jian Bin WANG Baoqiang XIANG Juan LI WU Tianjie Xiouhua FU WU Liguang MIN Jinzhong 2015Advances in Atmospheric Sciences2015,32,5:10
7Gold nanoparticle-based paper sensor for ultrasensitive and multiple detection of 32 (fluoro)quinolones by one monoclonal antibody显示文摘为快速、同时的察觉(fluoro ) quinolones,认出 32 的广泛地特定的 monoclonal 抗体(mAb )(fluoro ) quinolone 抗菌素作为 hapten 用 norfloxacin 衍生物和 sarfloxacin 衍生物的混合物被准备。基于黄金, nanoparticles (AuNPs ) 当时是的 immunochromatographic 脱衣与山羊反老鼠抗体和抗原(联合到 ovalbumin 的 sarfloxacin ) 集合了,过去常分别地形成 C 线和 T 线。这抗原与竞争(fluoro ) 在与 mAbs 孵化的一件样品的 quinolones 用 AuNPs 标记。长带能检测 32 ( fluoro ) quinolones 包括 oxolinic 酸, nalidixic 酸, miloxacin , pipemidic 酸, piromidic 酸, rosoxacin , cinoxacin , norfloxacin , pefloxacin , lomfloxacin , enofloxacin , fleroxacin , ciprofloxacin , enrofloxacin , dafloxacin , orbifloxacin , sparfloxacin , gemifloxacin , besifloxacin , balofloxacin , gatifloxacin ,在在 10 mi 以内的牛奶的 moxifloxacin , nadifloxacin , ofloxacin , marbofloxacin , flumequine , pazufloxacin , prulifloxacin , sarafloxacin , difloxacin , trovafloxacin ,和 tosufloxacin 从 1 ~ 100 ng/mL 和察觉的限制的长带范围的截止价值是 0.1-10 ng/mL。长带不包括四圜素, sulfamethazine,氨比西林,抗生素的一种,黄麴毒素 B1,或 gentamicin 与抗菌素做跨 react。简言之,这 immunochromatographic 脱衣是为主要屏蔽的一个很有用的工具(fluoro ) 在牛奶的 quinolones。Juan Peng Liqiang Liu Liguang Xu Shanshan Song Hua Kuang Gang Cui Chuanlai Xu 2017Nano Research2017,10,1:9
8Atmospheric nitrous oxide observations above the oceanic surface during CHINARE-18显示文摘The gas samples in the marine boundary layer were collected from the track for research ship Xuelong during the 18th Chinese Antarctic Research Expedition (CHINARE-18) and nitrous oxide measurements were made by HP5890ECD-GC in the laboratory. The results represent the shipboard N2O data set obtained within the lower troposphere with the average concentration of (313.5±2.6)nL*L-1 from 31°N to 69°S. The results showed a latitudinally weighted, mean interhemispheric difference of 0.61 nL*L-1. The latitudinal distribution of atmospheric N2O concentration was analyzed from northern midlatitudes to Southern Ocean around the Antarctic continent and it was showed that N2O concentration in the current confluences was higher than that in other oceanic areas. This indicated that strong N2O emissions occurred there. The longitudinal distribution of N2O concentrations in the Southern Ocean also showed similar situation. According to the interhemispheric difference of atmospheric N2O concentrations and the two-box model, we estimated that 2/5 of the global flux of N2O into the atmosphere is derived from the sources in the southern hemisphere.ZHU Renbin, SUN Liguang and LIU Xiaodong(Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China) 2003Progress in Natural Science:Materials International2003,13,8:9
9ADVANCES IN UNDERSTANDING AND FORECASTING RAPIDLY CHANGING PHENOMENA IN TROPICAL CYCLONES显示文摘This review of new understanding and forecasting of tropical cyclones(TCs) is based on presentations at the International Top-level Forum on Rapid Change Phenomena in Tropical Cyclones in Haikou, China. The major topics are the sudden changes in tracks, rapid changes in structure and intensity, rapid changes in rainfall, and advances in forecasting and forecaster requirements. Although improved track forecast guidance has been achieved with the Australian ACCESS-TC model and in track forecasts to 120 h by the China Meteorological Administration, there is a continuing need for better understanding and improved track forecast guidance. Advances in understanding of processes related to rapid intensification(RI), secondary eyewall formation, mechanisms controlling inner-core structure and size changes, and structure and intensity changes at landfall have been achieved, but progress in prediction of rapid changes in structure and intensity has been slow. Taking into account complex interactions involved in TC-related rainfall, a prioritized list of physical processes that govern rainfall from landfalling TCs in China has been developed. While forecaster participants were generally encouraged by the progress being made, they expressed a strong desire for a transition of that new knowledge to timely and reliable forecast guidance products.RUSSELL L.ELSBERRy LIANSHOU CHEN JIM DAVIDSON ROBERT ROGERS YUQING WANG LIGUANG WU 2013Tropical Cyclone Research and Review2013,2,1:7
10Variation of Antarctic seal population in response to human activities in the 20th century显示文摘A sediment core was collected from the Fildes Peninsula of Antarctica, which contained numerous seal hairs and was identified to be seal excrement deposition. By analyzing its total organic carbon (TOC) and concentrations of bio-elements, the seal population changes of the past century were reconstructed. The variation of seal population in the last century on the Fildes Peninsula is primarily controlled by human activities. The sealing industry in the early 20th century caused the dramatic decline of seal popula-tion. The protection of the Antarctic seals since the 1960s and the reduced seal's competition with whales for prey resources due to whaling lead to the recovery of seal population and make the high level of the seal population sustainable.YANG QiChao SUN LiGuang KONG DeMing HUANG Tao WANG YuHong 2010Chinese Science Bulletin2010,55,11:7
11Thymic epithelial progenitor cells and thymus regeneration: an update显示文摘胸腺为 T 房间开发和成熟提供必要微型环境。Thymic 上皮的房间(侦探) 它是 thymic 填写了外皮的上皮的房间(cTECs ) 和 thymic 髓的上皮的房间(mTECs ) ,很好被记录了为这些紧调整的过程批评。侦探的普通祖先房间是否能产生 cTECs 和 mTECs,长是争论的。大进步被取得了在最近的年里描绘普通侦探祖先房间。我们此处在胸腺新生象这些祖先房间一样关于侦探区别讨论唯一的起源范例。Lianjun Zhang Liguang Sun Yong Zhao 2007Cell Research2007,17,1:7
12Cenozoic tectonic and sedimentary evolution of southern Qaidam Basin, NE Tibetan Plateau and its implication for the rejuvenation of Eastern Kunlun Mountains显示文摘The Eastern Kunlun Mountains play an important role in the growth and eastward extrusion of the Tibetan Plateau. Tectonic and sedimentary study of the Cenozoic Qaidam Basin, especially the southern part, provides key evidence for understanding their evolution. Here we present evidence including isopach maps, seismic sections and sedimentary analysis of single well to illustrate the sedimentary development of the basin and the structural features of its southern margin. The Qaidam Basin extended across Qiman Tagh-Eastern Kunlun Mountains in the early Cenozoic and withdrew northward at ca. 35.5 Ma, and then buckled as an EW striking elliptical depression since ca. 14.9 Ma, with the main depocenter migrating eastward. Our results support the view that the Kumukol and Hoh Xil basins joined the Qaidam Basin in the early Cenozoic time and we propose the Eastern Kunlun Mountains uplifted in the mid-Miocene.MAO LiGuang XIAO AnCheng WU Lei LI BenLiang WANG LiQun LOU QianQian DONG YouPu QIN SuHua 2014Science China Earth Sciences2014,57,11:7
13Role of ENSO in the interannual relationship between Tibetan Plateau winter snow cover and Northwest Pacific tropical cyclone genesis frequency显示文摘Previous studies have revealed a significantly negative correlation between prior winter snow cover over the Tibetan Plateau(TPSC) and tropical cyclone genesis frequency(TCF) over the western North Pacific(WNP) in the following typhoon season. This study revisited this relationship based on long-term observational data. The results showed that the interannual correlation between TCF over the WNP and TPSC experienced a shift in the early 1990 s. This correlation is significant during only 1993–2012 and is considerably weak during 1976–1992. The possible reasons causing the shift were examined further, and the results demonstrated that the central Pacific(CP) El Ni?o-Southern Oscillation(ENSO) has played a vital role in intensifying the interannual relationship between TCF over the WNP and TPSC since the early 1990 s. During 1993–2012, TPSC was negatively related to CP ENSO. When TPSC was higher than(lower than) normal, CP ENSO was often in its cold(warm) phase. Such a combination remarkably enhances the relationship of TPSC with the zonal land-sea thermal difference and thus with the summer monsoon over the WNP. Additionally, it enhances the modulation of TPSC on the dynamical environments controlling TCF. As a result, the linkage between TPSC and TCF was significantly strengthened in this period. In sharp contrast, due to the weak relationship between TPSC and ENSO followed by the weak modulation of TPSC on the summer monsoon over the WNP and the dynamical environment during 1976–1992, the linkage between TPSC and TCF was weak during this time period. The results from additional dynamical diagnostic analyses further showed that during 1993–2012 CP ENSO modulated the barotropic energy conversion of zonal winds over the WNP, contributing to the intensified relationship between TPSC and TCF. These results will improve seasonal forecasting of tropical cyclone activity over the WNP.ZHAN RuiFen DING YiHui WU LiGuang LEI XiaoTu 2016Science China Earth Sciences2016,59,10:6
14CO_(2) Reduction Request and Future High-Efficiency Zero-Emission Argon Power Cycle Engine显示文摘To meet the requirements of strict fuel consumption and emission limits,continuously increasing the thermal efficiency of an internal combustion engine and decreasing its exhaust emissions are the main challenges to its sustainable development within the automotive industry.Considering the competition with other zero-emission powertrain systems,such as vehicle batteries and fuel cells,the development of the internal combustion engine needs to focus on producing higher efficiency and zero emissions to meet the request of CO_(2) reduction.This paper introduces two novel concepts for an internal combustion engine featuring high efficiency and zero emissions.Referred to as the argon power cycle engine fueled with either hydrogen or natural gas within an oxygen–argon mixture,its fundamentals and characteristics are expounded.This includes a method necessary to absorb carbon dioxide when natural gas is used as fuel instead of hydrogen.Liguang Li Yinchun Gong Jun Deng Xuehai Gong 2018Automotive Innovation2018,1,1:6
15The effects of span-wise and chord-wise flexibility on the aerodynamic performance of micro flapping-wing显示文摘The flexibility of flapping-wing strongly affects the aerodynamic performance of Flapping-wing Micro Air Vehicle (FMAV),and the deformations in span-wise and chord-wise directions are coupled together in flight.In this study,the flexible deformation is formulated in span-wise and chord-wise separately in order to analyze its effects on aerodynamic behavior.The preconditioned Navier-Stokes equations based on chimera grid are used in the computational fluid dynamics method to study the aerodynamic effects caused by flexible deformation,and the simulation results are compared with experimental test to illustrate the capability of above method.Based on our results,it is clearly showed that the span-wise flexible deformation should be limited in a small range to achieve higher aerodynamic performance and the chord-wise deformation could enhance the aerodynamic performance.The results also suggest that FMAV designers should design the flapping-wing with high stiffness leading edge to limit the span-wise deformation,and more flexible chord ribs to keep chord-wise deformation in suitable range.YANG WenQing SONG BiFeng SONG WenPing WANG LiGuang 2012Chinese Science Bulletin2012,57,22:6
16Allele-aware chromosome-scale assembly of the allopolyploid genome of hexaploid Ma bamboo(Dendrocalamus latiflorus Munro)显示文摘Dendrocalamus latiflorus Munro is a woody clumping bamboo with rapid shoot growth.Both genetic transformation and clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protein 9(Cas9)gene editing techniques are available for D.latiflorus,enabling reverse genetic approaches.Thus,D.latiflorus has the potential to be a model bamboo species.However,the genome sequence of D.latiflorus has remained unreported due to its polyploidy and large genome size.Here,we sequenced the D.latiflorus genome and assembled it into three allele-aware subgenomes(AABBCC),representingthe largest genome of a major bamboo species.We assembled 70 allelic chromosomes(2,737 Mb)for hexaploid D.latiflorus using both singlemolecule sequencing from the Pacific Biosciences(Pac Bio)Sequel platform and chromosome conformation capture sequencing(Hi-C).Repetitive sequences comprised 52.65%of the D.latiflorus genome.We annotated 135231 protein-coding genes in the genome based on transcriptomes from eight different tissues.Transcriptome sequencing using RNA-Seq and Pac Bio singlemolecule real-time long-read isoform sequencing revealed highly differential alternative splicing(AS)between non-abortive and abortive shoots,suggesting that AS regulates the abortion rate of bamboo shoots.This high-quality hexaploid genome and comprehensive strand-specific transcriptome datasets for this Poaceae family member will pave the way for bamboo research using D.latiflorus as a model species.Yushan Zheng Deming Yang Jundong Rong Liguang Chen Qiang Zhu Tianyou He Lingyan Chen Jing Ye Lili Fan Yubang Gao Hangxiao Zhang Lianfeng Gu 2022Journal of Integrative Plant Biology2022,64,3:6
17Re-examination of Tropical Cyclone Formation in Monsoon Troughs over the Western North Pacific显示文摘The monsoon trough(MT) is one of the large-scale patterns favorable for tropical cyclone(TC) formation over the western North Pacific(WNP). This study re-examines TC formation by treating the MT as a large-scale background for TC activity during May–October. Over an 11-year(2000–10) period, 8.3 TC formation events on average per year are identified to occur within MTs, accounting for 43.1% of the total TC formation events in the WNP basin. This percentage is much lower than those reported in previous studies. Further analysis indicates that TC formation events in monsoon gyres were included at least in some previous studies. The MT includes a monsoon confluence zone where westerlies meet easterlies and a monsoon shear line where the trade easterlies lie north of the monsoon westerlies. In this study, the large-scale flow pattern associated with TC formation in the MT is composited based on the reference point in the confluence zone where both the zonal and meridional wind components are zero with positive vorticity. While previous studies have found that many TCs form in the confluence zone, the composite analysis indicates that nearly all of the TCs formed in the shear region, since the shear region is associated with stronger low-level relative vorticity than the confluence zone. The prevailing easterly vertical shear of zonal wind and barotropic instability may also be conducive to TC formation in the shear region, through the development of synoptic-scale tropical disturbances in the MT that are necessary for TC formation.ZONG Huijun WU Liguang 2015Advances in Atmospheric Sciences2015,32,7:5
18Effect of biodiesel on the particle size distribution in the exhaust of common-rail diesel engine and the mechanism of nanoparticle formation显示文摘Effect of biodiesel blends on the particle size distribution (PSD) of exhaust aerosol and the mechanism of nanoparticle formation were investigated with a modern common rail light-duty diesel engine. The results showed that PSD of diesel included two modes:nucleation mode (NM) and accumulation mode (CM). The criterion diameter of the two modes is 50 nm. Only CM was observed for all fuels under the condition of 50 N.m,2000 r/min. When the engine torque was higher than 150 N.m,log-modal PSD of diesel shifted to bimodal. At higher loads,if the biodiesel blend ratio was below 60%,the PSD of biodiesel blends still included the two modes. However,no NM particles were found for pure biodiesel. At lower loads,only CM was found in PSD of all fuels. Significant reduction of CM particles was found for biodiesel blends compared with diesel. Discussion on the mechanism of nanoparticle formation indicated that for the light-duty diesel engine with oxidation catalysts,fuel consumption and exhaust temperature increased with increasing the engine loads,and SO2 was converted to SO3 by catalyst which,in its hydrated form,could act as the precursor for biodiesel NM formation. Therefore,sulfur level of biodiesel blends dominates the nanoparticle formation in light-duty diesel engine with oxidation catalysts.ZHANG XuSheng ZHAO Hui HU ZongJie WU ZhiJun LI LiGuang 2009Science China(Technological Sciences)2009,52,9:5
19Influence of Future Tropical Cyclone Track Changes on Their Basin-Wide Intensity over the Western North Pacific: Downscaled CMIP5 Projections显示文摘The possible changes of tropical cyclone(TC) tracks and their influence on the future basin-wide intensity of TCs over the western North Pacific(WNP) are examined based on the projected large-scale environments derived from a selection of CMIP5(Coupled Model Intercomparison Project Phase 5) models. Specific attention is paid to the performance of the CMIP5 climate models in simulating the large-scale environment for TC development over the WNP. A downscaling system including individual models for simulating the TC track and intensity is used to select the CMIP5 models and to simulate the TC activity in the future.The assessment of the future track and intensity changes of TCs is based on the projected large-scale environment in the21 st century from a selection of nine CMIP5 climate models under the Representative Concentration Pathway 4.5(RCP4.5)scenario. Due to changes in mean steering flows, the influence of TCs over the South China Sea area is projected to decrease,with an increasing number of TCs taking a northwestward track. Changes in prevailing tracks and their contribution to basin-wide intensity change show considerable inter-model variability. The influences of changes in prevailing track make a marked contribution to TC intensity change in some models, tending to counteract the effect of SST warming. This study suggests that attention should be paid to the simulated large-scale environment when assessing the future changes in regional TC activity based on climate models. In addition, the change in prevailing tracks should be considered when assessing future TC intensity change.WANG Chao WU Liguang 2015Advances in Atmospheric Sciences2015,32,5:4
20Higher sea surface temperature in the northern South China Sea during the natural warm periods of late Holocene than recent decades显示文摘The large-scale syntheses of global mean temperatures in IPCC fourth report suggested that the Northern Hemisphere temperature in the second half of the 20th century was likely the highest in at least the past1,300 years and the 1990s was likely the warmest decade.However,this remains debated and the controversy is centered on whether temperatures during the recent half century were higher than those during the Medieval Climate Anomaly(MCA,AD 800–1300)and the Roman Warm Period(RWP,BC 200–AD 400),the most recent two natural warm periods of the late Holocene.Here the high resolution sea surface temperatures(SSTs)of two time windows around AD 990(±40)and AD 50(±40),which located in the MCA and RWP respectively,were reconstructed by the Sr/Ca ratio and d18O of Tradacna gigas shells from the northern South China Sea.The results suggested that the mean SSTs around AD 990(±40)and AD 50(±40)were 28.1°C and 28.7°C,0.8°C and 1.4°C higher than that during AD 1994–2005,respectively.These records,together with the tree ring,lake sediment and literature records from the eastern China and northwest China,imply that the temperatures in recent decades do not seem to exceed the natural changes in MCA,at least in eastern Asia from northwest China to northern SCS.Hong Yan Liguang Sun Da Shao Yuhong Wang Gangjian Wei 2014Chinese Science Bulletin2014,59,31:4
返回顶部 每页显示:
共12页 首页 上一页 第1页 下一页 末页 /12 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费