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| 1 | Development of silicon photonic devices for optical interconnects显示文摘Silicon photonic devices based on complementary-metal-oxide-semiconductor(CMOS) compatible technologies have shown attractive performances on very-large-scale monolithic optoelectronic integration,high speed modulation and switching,and efficient off-chip optical coupling.This paper presents the recent progress on fast silicon optical modulation,wavelength-insensitive optical switching and efficient optical coupling techniques in our group.Several CMOS-compatible silicon optical couplers with different structures have been developed,showing the highest coupling efficiency of 65%.Broadband silicon-based optical switches with sub-nanosecond switching on-off time are experimentally realized.Silicon modulators with novel PN junctions are demonstrated with the speed up to 50 Gb s-1. | XIAO Xi LI ZhiYong CHU Tao XU Hao LI XianYao NEMKOVA Anastasia KANG Xiong YU YuDe YU JinZhong | 2013 | Chinese Science Bulletin2013，58，7： | 4 |
| 2 | Effect of opening the Drake Passage on the oceanic general circulation:A box model study显示文摘The impacts of opening the Drake Passage(DP) on the oceanic general circulation are examined.When the DP is open,wind stress at mid-and high latitudes gives rise to a wind-driven gyre,which induces a meridional heat exchange between mid-and high latitudes in the Southern Ocean.After the opening of the DP,the Antarctic Circumpolar Current(ACC) forms and its associated strong temperature front blocks the heat transport from mid-latitudes to high latitudes.A simple box model is formulated,in which the effects of the wind stress(for the case of DP closed) and the thermal front(for the case of DP open) on the variability of Antarctic Bottom Water(AABW) and North Atlantic Deep Water(NADW) are explored.The sensitivity experiments demonstrate that:(1) When the DP is closed,the enhancement of the wind-driven gyre leads to the decline of AABW formation in the Southern Ocean and the increase of NADW formation in the North Atlantic.As a result,water in high latitudes of the Southern Ocean becomes warmer,so does the bottom water of global ocean.(2) When the DP is open,there is no formation of AABW until the intensity of thermal front along ACC exceeds a threshold value(it is 4.03℃ in our model).Before the formation of AABW,temperature in most of the oceans is higher than that after the formation of AABW,which usually leads to the cooling of high latitudes of the Southern Hemisphere and the bottom water in global ocean.When the strength of the thermal front is lower than the critical value,there is no AABW formation,and temperature in most of the oceans is slightly higher.These results demonstrate that during the opening of the DP,changes in wind stress and the formation of the thermal front in the Southern Ocean can substantially affect the formation of AABW and NADW,thus changing the state of meridional overturning circulation in the global ocean. | SHAO QiuLi CHEN XianYao HUANG RuiXin | 2013 | Science China Earth Sciences2013，56，9： | 2 |
| 3 | A fast and accurate online self-organizing scheme for parsimonious fuzzy neural networks显示文摘 | Wang Ning Meng Joo Er Meng Xianyao | 2009 | Neurocomputing2009，72，161718： | 1 |
| 4 | A Unified Analytical Framework for Ship Domains显示文摘 | Wang Ning Meng Xianyao Xu Qingyang Wang Zuwen | 2009 | The Journal of Navigation2009，，4： | 1 |
| 5 | 25 Gbit/s silicon microring modulator based on misalignment-tolerant interleaved PN junctions 显示文摘 | Xiao Xi Xu Hao Li Xianyao | 2012 | Optics Express2012，20，3： | 1 |
| 6 | Barrier and compensation layers in the East China Sea显示文摘Climatology of the isothermal layer depth(ILD)and the mixed layer depth(MLD)has been produced from in-situ temperature-salinity observations in the East China Sea(ECS)since 1925.The methods applied on the global are used to compute the ILD and the MLD in the ECS with a temperature criterion ΔT=0.8 ℃ for the ILD,and a density criterion with a threshold Δσθ corresponding to fixed ΔT=0.8 ℃ for the MLD,respectively.With the derived climatology ILD and MLD,the monthly variations of the barrier layer(BL)and the compensation layer(CL)in the ECS are analyzed.The BL mainly exists in the shallow water region of the ECS during April-June with thickness larger than 15 m.From December to next March,the area along the shelf break from northeast of Taiwan Island to the northeast ECS is characterized by the CL.Two kinds of main temperature-salinity structures of the CL in this area are given. | CHEN Xianyao QIAO Fangli WANG Qin WANG Xiuhongx YUAN Yeli | 2008 | Acta Oceanologica Sinica2008，27，3： | 1 |
| 7 | Intercomparison of the Extended Reconstructed Sea Surface Temperature v4 and v3b Datasets显示文摘Version 4(v4) of the Extended Reconstructed Sea Surface Temperature(ERSST) dataset is compared with its precedent, the widely used version 3b(v3b). The essential upgrades applied to v4 lead to remarkable differences in the characteristics of the sea surface temperature(SST) anomaly(SSTa) in both the temporal and spatial domains. First, the largest discrepancy of the global mean SSTa values around the 1940 s is due to ship-observation corrections made to reconcile observations from buckets and engine intake thermometers. Second, differences in global and regional mean SSTa values between v4 and v3b exhibit a downward trend(around-0.032℃ per decade) before the 1940s, an upward trend(around 0.014℃ per decade) during the period of 1950–2015, interdecadal oscillation with one peak around the 1980s, and two troughs during the 1960s and 2000s, respectively. This does not derive from treatments of the polar or the other data-void regions, since the difference of the SSTa does not share the common features. Third, the spatial pattern of the ENSO-related variability of v4 exhibits a wider but weaker cold tongue in the tropical region of the Pacific Ocean compared with that of v3b, which could be attributed to differences in gap-filling assumptions since the latter features satellite observations whereas the former features in situ ones. This intercomparison confirms that the structural uncertainty arising from underlying assumptions on the treatment of diverse SST observations even in the same SST product family is the main source of significant SST differences in the temporal domain. Why this uncertainty introduces artificial decadal oscillations remains unknown. | WANG Jinping CHEN Xianyao | 2018 | Journal of Ocean University of China2018，17，2： | 1 |
| 8 | Global sea level trend during 1993-2012 显示文摘 | CHEN Xianyao FENG Ying HUANG N E | 2014 | Global and Planetary Change2014，112，1： | 1 |
| 9 | Varying planetary heat sink led to global-warming slowdown and acceleration显示文摘 | Chen Xianyao Tung Ka-Kit | 2014 | Science2014，345，6199： | 1 |
| 10 | Varying planetary heat sink led to global-warming slowdown and aeceleration显示文摘 | Xianyao Chen Tung K K | 2014 | Science2014，345，6199： | 1 |
| 11 | China’s Recent Progresses in Polar Climate Change and Its Interactions with the Global Climate System显示文摘During the recent four decades since 1980,a series of modern climate satellites were launched,allowing for the measurement and record-keeping of multiple climate parameters,especially over the polar regions where traditional observations are difficult to obtain.China has been actively engaging in polar expeditions.Many observations were conducted during this period,accompanied by improved Earth climate models,leading to a series of insightful understandings concerning Arctic and Antarctic climate changes.Here,we review the recent progress China has made concerning Arctic and Antarctic climate change research over the past decade.The Arctic temperature increase is much higher than the global-mean warming rate,associated with a rapid decline in sea ice,a phenomenon called the Arctic Amplification.The Antarctic climate changes showed a zonally asymmetric pattern over the past four decades,with most of the fastest changes occurring over West Antarctica and the Antarctic Peninsula.The Arctic and Antarctic climate changes were driven by anthropogenic greenhouse gas emissions and ozone loss,while tropical-polar teleconnections play important roles in driving the regional climate changes and extreme events over the polar regions.Polar climate changes may also feedback to the entire Earth climate system.The adjustment of the circulation in both the troposphere and the stratosphere contributed to the interactions between the polar climate changes and lower latitudes.Climate change has also driven rapid Arctic and Southern ocean acidification.Chinese researchers have made a series of advances in understanding these processes,as reviewed in this paper. | Xichen LI Xianyao CHEN Bingyi WU Xiao CHENG Minghu DING Ruibo LEI Di QI Qizhen SUN Xiaoyu WANG Wenli ZHONG Lei ZHENG Meijiao XIN Xiaocen SHEN Chentao SONG Yurong HOU | 2023 | Advances in Atmospheric Sciences2023，40，8： | 1 |
| 12 | Spatial Variation of Hydraulic Conductivity Categories in a Highly Heterogeneous Aquifer: A Case Study in the North China Plain (NCP)显示文摘Compared with research on spatial variation of hydraulic conductivity(K), less effort has been made researching different grades of K value in the North China Plain(NCP). In this study, 3D spatial distribution models of different grades of K were established by considering the effects of clay fraction content and uniformity coefficient(Cu). The K value can be divided into five grades: very low, low, permeable, high, and very high groups. The volume percentages of these clusters were 3.06%, 36.01%, 55.70%, 4.82%, and 0.41% for the first aquifer; 0.016%, 9.56%, 88.25%, 2.16%, and 0.014% for the second aquifer; and 0.04%, 17.74%, 84.21%, 0.001%, and 0.01% for the third aquifer. It is concluded that the high and very high K values are fully affected by burial depth and that the very low, low, and permeable K values are mainly controlled by depositional environment and are partially influenced by burial depth. The burial depth became the main influencing factor only within the same depositional environment, causing the overall K to decrease with depth. The variations of very low, low, permeable, high, and very high categories of K values with depth are described in this study. This can provide useful information for non-technical decision makers to achieve sustainable development of deep groundwater resources. | Rong Ma Jiansheng Shi Xianyao Shi | 2017 | Journal of Earth Science2017，28，1： | 1 |
| 13 | A fast and accurate online self-organizing scheme for parsimonious fuzzy neural networks显示文摘 | Ning Wang Meng Joo Er Xianyao Meng | 2009 | Neurocomputing2009，72，： | 1 |
| 14 | The multi-di- mensional ensemble empirical mode decomposition method 显示文摘 | WU Zhaohua HUANG N E CHEN Xianyao | 2009 | Adv Adapt Data Anal2009，1，3： | 1 |
| 15 | Some considerations on physical analysis of data 显示文摘 | Wu Zhaohua Huang Norden E Chen Xianyao | 2011 | Advances in Adaptive Data Analysis2011，3，112： | 1 |
| 16 | Deletions in the pyruvate pathway of Salmonella Typhimurium alter SPI1-mediated gene expression and infectivity显示文摘Background: Salmonella enterica serovar Typhimurium is a major foodborne pathogen worldwide. S. Typhimurium encodes type III secretion systems via Salmonella pathogenicity islands(SPI), producing the major effector proteins of virulence. Previously, we identified two genes of Salmonella pyruvate metabolism that were up-regulated during chicken cell infection: pyruvate formate lyase I(pflB) and bifunctional acetaldehyde-CoA/alcohol dehydrogenase(adhE). We were therefore interested in examining the role these genes may play in the transmission of Salmonella to humans. Methods: Mutant strains of Salmonella with single gene deletions for pflB and adhE were created. Invasion and growth in human HCT-8 intestinal epithelial cells and THP-1 macrophages was examined. Quantitative PCR was performed on 19 SPI-1 genes. Results: In HCT-8 cells, both mutant strains had significantly higher intracellular counts than the wild-type from 4 to 48 h post-infection. Various SPI-1 genes in the mutants were up-regulated over the wild-type as early as 1 h and lasting until 24 h post-infection. In THP-1 cells, no significant difference in internal Salmonella counts was observed; however, SPI-1 genes were largely down-regulated in the mutants during the time-course of infection. We also found five SPI-1 genes- hilA, hilC hilD, sicP and rtsA- which were up-regulated in at least one of the mutant strains in log-phase broth cultures alone. We have therefore identified a set of SPI-1 virulence genes whose regulation is effected by the central metabolism of Salmonella. | Jason Abernathy Carolina Corkill Carolee Hinojosa Xianyao Li Huaijun Zhou | 2013 | Journal of Animal Science and Biotechnology2013，4，4： | 1 |
| 17 | Inter-comparison of seasonal variability and nonlinear trend between AERONET aerosol optical depth and PM10 mass concentrations in Hong Kong显示文摘Here we used Empirical Mode Decomposition(EMD) method to study seasonal variability and nonlinear trend of corrected AERONET Aerosol Optical Depth(AOD/Hi) and corrected PM10 mass concentrations(PM10×f(RH)) in Hong Kong during 2005–2011. AOD/Hi is highly correlated with PM10×f(RH) in semi-annual and annual time scales(with correlation coefficient 0.67 for semi-annual and 0.79 for annual components, 95% confidence interval). On the semi-annual scale, both AOD/Hi and PM10×f(RH) can capture the two maxima in March and October, respectively, with much stronger amplitude in March probably due to the long-range transport of dust storm. On the annual cycle, the AOD/Hi and PM10×f(RH), which are negatively correlated with the precipitation and solar radiation, vary coherently with the maxima in February. This annual peak occurs about one month earlier than the first peak of the semi-annual variability in March, but with only half amplitude. During 2005–2011, both AOD/Hi and PM10×f(RH) exhibit the pronounced decreasing trend with the mean rate of 14 μg m–3 per year for PM10×f(RH), which reflects the significant effects of the air pollution control policy in Hong Kong during the past decade. The nonlinear trend analysis indicates that the decreasing of PM10×f(RH) is slower than that of AOD/Hi when the AOD/Hi is less than 0.44 but becomes faster when the AOD/Hi exceeds 0.44. These results illustrate that the AERONET AOD can be used quantitatively to estimate local air-quality variability on the semi-annual, annual, and long-term trend time scales. | HE JingJing ZHANG Min CHEN XianYao WANG Meng | 2014 | Science China Earth Sciences2014，57，11： | 1 |
| 18 | Denoising enabled channel estimation for underwater acoustic communications:A sparsity-aware model-driven learning approach显示文摘It has always been difficult to achieve accurate information of the channel for underwater acoustic communications because of the severe underwater propagation conditions,including frequency-selective property,high relative mobility,long propagation latency,and intensive ambient noise,etc.To this end,a deep unfolding neural network based approach is proposed,in which multiple layers of the network mimic the iterations of the classical iterative sparse approximation algorithm to extract the inherent sparse features of the channel by exploiting deep learning,and a scheme based on the Sparsity-Aware DNN(SA-DNN)for UAC estimation is proposed to improve the estimation accuracy.Moreover,we propose a Denoising Sparsity-Aware DNN(DeSA-DNN)based enhanced method that integrates a denoising CNN module in the sparsity-aware deep network,so that the degradation brought by intensive ambient noise could be eliminated and the estimation accuracy can be further improved.Simulation results demonstrate that the performance of the proposed schemes is superior to the state-of-the-art compressed sensing based and iterative sparse recovery schems in the aspects of channel recovery precision,pilot overhead,and robustness,particularly under unideal circumstances of intensive ambient noise or inadequate measurement pilots. | Sicong Liu Younan Mou Xianyao Wang Danping Su Ling Cheng | 2023 | Intelligent and Converged Networks2023，4，1： | 0 |
| 19 | Preface to the Special Issue on Changing Arctic Climate and Low/Mid-latitudes Connections显示文摘The Arctic climate system has changed rapidly during recent decades with a two-four times faster warming rate than the global average subject to the uncertainties of analysis datasets and approaches.These changes have apparently resulted in broader and sizeable impacts within the Arctic,in the low/mid-latitudes,and globally.The importance of these changes and impacts makes the Arctic stand out within the global climate systems,drawing great attention and interests from the climate research community,the general public,and the government sector.One of the persistent,leading-edge topics in climate stud-ies during recent decades has therefore been to improve understanding of the underlying driving mechanisms,evaluate socioe-conomic and ecological impacts,and enhance the ability of the prediction and projections of Arctic climate changes. | Xiangdong ZHANG Xianyao CHEN Andrew ORR James EOVERLAND Timo VIHMA Muyin WANG Qinghua YANG Renhe ZHANG | 2023 | Advances in Atmospheric Sciences2023，40，12： | 0 |
| 20 | Arctic Sea Level Variability from Oceanic Reanalysis and Observations显示文摘Quantifying the contributions to Arctic sea level(ASL)variability is critical to understand how the Arctic is responsing to ongoing climate change.Here,we use Ocean Reanalysis System 5(ORAS5)reanalysis data and tide gauge and satellite altimetry observations to quantify contributions from different physical processes on the ASL variability.The ORAS5 reanalysis shows that the ASL is rising with a trend of 2.5±0.3 mm yr−1(95%confidence level)over 1979-2018,which can be attributed to four components:(i)the dominant component from the global sea level increase of 1.9±0.5 mm yr−1,explaining 69.7%of the total variance of the ASL time series;(ii)the Arctic Oscillation-induced mass redistribution between the deep central basin and shallow shelves,with no significant trend and explaining 6.3%of the total variance;(iii)the steric sea level increase centering on the Beaufort Gyre region with a trend of 0.5±0.1 mm yr−1 and explaining 29.1%of the total variance of the ASL time series;and(iv)the intrusion of Pacific water into the Arctic Ocean,with no significant trend and contributing 14.2%of the total ASL variability.Furthermore,the dramatic sea ice melting and the larger area of open water changes the impact of the large-scale atmospheric forcing on the ASL variability after 1995,and the ocean dynamic circulation plays a more important role in the ASL variability. | Jinping WANG Xianyao CHEN | 2023 | Advances in Atmospheric Sciences2023，40，12： | 0 |
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