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| 1 | Effects of Sb,Sm, and Sn additions on the microstructure and mechanical properties of Mg-6Al-1.2Y-0.9Nd alloy显示文摘The microstructure and mechanical properties of Mg-6Al-1.2Y-0.9Nd magnesium alloy with Sb, Sm, or Sn addition were investigated through X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results show that small amounts of Sb, Sm, and especially Sn can refine the grains of the alloy. High melting point Sb3Y5, Al2Sm, and Nd5Sn3 intermetallic compounds can be formed respectively when Sb, Sm, and Sn are added to the alloy. Sb and Sm can improve the tensile strength of the alloy at ambient and elevated temperatures. The tensile strength of the alloy with Sm addition is the highest at 293 and 423 K. However, the tensile strength of the alloy with Sn addition is the highest at 448 K. | LI Kejie LI Quanan JING Xiaotian CHEN Jun ZHANG Xingyuan | 2009 | Rare Metals2009，28，5： | 39 |
| 2 | The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis显示文摘 | Huang Norden E. Shen Zheng Long Steven R. Wu Manli C. Shih Hsing H. Zheng Quanan Yen Nai-Chyuan Tung Chi Chao Liu Henry H | 1998 | Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences . 1998 (1971)1998，，1971： | 22 |
| 3 | Observation of ocean current response to 1998 Hurricane Georges in the Gulf of Mexico显示文摘The ocean current response to a hurricane on the shelf-break is examined. The study area is the DeSoto Canyon in the northeast Gulf of Mexico, and the event is the passage of 1998 Hurricane Georges with a maximum wind speed of 49 m/s. The data sets used for analy- sis consist of the mooring data taken by the Field Program of the DeSoto Canyon Eddy Intrusion Study, and simultaneous winds ob- served by NOAA (National Oceanic and Atmospheric Administration) Moored Buoy 42040. Time-depth ocean current energy density images derived from the observed data show that the ocean currents respond almost immediately to the hurricane with important differ- ences on and off the shelf. On the shelf, in the shallow water of 100 m, the disturbance penetrates rapidly downward to the bottom and forms two energy peaks, the major peak is located in the mixed layer and the secondary one in the lower layer. The response dissipates quickly after external forcing disappears. Off the shelf, in the deep water, the major disturbance energy seems to be trapped in the mixed layer with a trailing oscillation; although the disturbance signals may still be observed at the depths of 500 and 1 290 m. Verti- cal dispersion analysis reveals that the near-initial wave packet generated off the shelf consists of two modes. One is a barotropic wave mode characterized by a fast decay rate of velocity amplitude of 0.020 s-1, and the other is baroclinic wave mode characterized by a slow decay rate of 0.006 9 s-1. The band-pass-filtering and empirical function techniques are employed to the frequency analysis. The results indicate that all frequencies shift above the local inertial frequency. On the shelf, the average frequency is 1.04f in the mixed layer, close to the diagnosed frequency of the first baroclinic mode, and the average frequency increases to 1.07f in the thermocline. Off the shelf, all frequencies are a little smaller than the diagnosed frequency of the first mode. The average frequency decreases from 1.035f in the mixed layer to 1.02f in the thermocline, implying a trend for the shift in frequency of the oscillations towards f with the depth. | ZHENG Quanan LAI Ronald J HUANG Nortlen E PAN Jiayi LIU W Timothy | 2006 | Acta Oceanologica Sinica2006，25，1： | 20 |
| 4 | The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis显示文摘 | Huang Norden E. Shen Zheng Long Steven R. Wu Manli C. Shih Hsing H. Zheng Quanan Yen Nai-Chyuan Tung Chi Chao Liu Henry H | 1998 | 1998 (1971)1998，，1971： | 18 |
| 5 | The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis显示文摘 | Huang Norden E. Shen Zheng Long Steven R. Wu Manli C. Shih Hsing H. Zheng Quanan Yen Nai-Chyuan Tung Chi Chao Liu Henry H | 1998 | Proceedings of the Royal Society A: Mathematical Physical and Engineering Sciences1998，，1971： | 15 |
| 6 | Microstructure and mechanical properties of Mg-Gd-Y-Sm-Al alloy and analysis of grain refinement and strengthening mechanism显示文摘The effects of Sm on the microstructure and mechanical properties of Mg-11 Gd-2 Y-0.6 Al alloy were investigated by X-ray diffraction,optical microscopy,scanning electron microscopy,energy dispersive spectrometry and high resolution transmission electron microscopy.Based on the theory of edge—edge matching and electronegativity theory,the mechanism of grain refinement is discussed.The strengthening mechanism is expounded conveniently from fine grain strengthening,coherent strengthening,precipitation strengthening and grain boundary strengthening.The results show that the micro structure of Mg-11 Gd-2 Y-0.6 Al alloy is mainly composed of a-Mg matrix,Mg5 Gd and Mg24Y5 phases.The addition of Sm forms Mg41Sm5 phase in the alloy and refines the alloy.The addition of Sm significantly improves the mechanical properties of the alloy at room and high temperatures.When the addition of Sm is 3 wt%,the tensile strengths of the alloy at room temperature and high temperature(200℃)reach the maximum value 292 and 321 MPa,respectively.The fracture mode of the alloy at different temperatures is mainly brittle fracture and intercrystalline fracture. | Xiaoya Chen Quanan Li Jun Chen Limin Zhu | 2019 | Journal of Rare Earths2019，37，12： | 12 |
| 7 | An overview on SAR measurements of sea surface wind显示文摘Studies show that synthetic aperture radar (SAR) has the capability of providing high-resolution (sub-kilometer) sea surface wind fields. This is very useful for applications where knowledge of the sea surface wind at fine scales is crucial. This paper aims to review the latest work on sea surface wind field retrieval using SAR images. As shown, many different approaches have been developed for retrieving wind speed and wind direction. However, much more work will be required to fully exploit the SAR data for improving the retrieval accuracy of high-resolution winds and for producing wind products in an operational sense. | Hui Lin Qing Xu Quanan Zheng | 2008 | Progress in Natural Science:Materials International2008，18，8： | 10 |
| 8 | The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis显示文摘 | Huang Norden E. Shen Zheng Long Steven R. Wu Manli C. Shih Hsing H. Zheng Quanan Yen Nai-Chyuan Tung Chi Chao Liu Henry H | 1998 | Proceedings of the Royal Society A: Mathematical Physical and Engineering Sciences1998，，1971： | 10 |
| 9 | Effects of Sm addition on microstructure and mechanical properties of a Mg-10Y alloy显示文摘To further increase the mechanical properties, 0.5wt.% Sm was introduced to a Mg-10Y alloy in this study. The effects of Sm addition on the microstructures and mechanical properties of the Mg-10Y alloy, especially the aged Mg-10Y alloy, were investigated. The microstructure observation and tensile tests were performed by using an optical microscopy, a scanning electron microscopy and a universal material testing machine, respectively. The phase analysis was performed using X-ray diffractometer. The results show that the 0.5wt.% Sm addition can not only promote the formation of fine and dispersed Mg24Y5 phases, but also improve their morphology and distribution; it also increases the thermal stability of Mg24Y5 phases. Sm addition is seen to increase the ultimate tensile strength of Mg-10Y alloy at elevated temperatures(200, 250, 300 and 350 ℃), while decrease the elongation. But the elongation is still up to 7.5% even at 350 ℃. In the range of 250 ℃ to 300℃, the ultimate tensile strength of the alloy reaches its maximum(with a range average of 235 MPa) and is not sensitive to the temperature change, which is very useful to the application of heat-resistant magnesium alloys. Even at 350 ℃, the ultimate tensile strength of Mg-10Y-0.5Sm is still up to 155 MPa. Considering both of the ultimate tensile strength and elongation, the maximum application temperature of the Mg-10Y-0.5Sm alloy can be up to 300 ℃. The strengthening mechanisms of Mg-10Y-0.5Sm alloy are mainly attributed to dispersion strengthening of Mg24Y5 phase particles with a certain solubility of Sm and grain refinement strengthening of α-Mg matrix. | Li Quanan Zhang Qing Wang Yaogui Zhou Wei | 2014 | China Foundry2014，11，1： | 7 |
| 10 | A new type of internal solitary waves with a re-appearance period of 23 h observed in the South China Sea显示文摘The South China Sea (SCS), in particular the northern SCS, is one of ocean areas where energetic internal solitary waves (ISWs)occur most frequently (Cai et al., 2012; Zheng, 2017). Based on the re-appearance period (RP) at an observation station, Ramp et al.(2004) divided the ISWs into two types:Type-a and Type-b. Type-a ISWs arrive regularly at the same time every day, i.e., the RP is about 24 h, and Type-b ISWs arrive about one hour late every day, i.e., the RP is about 25 h. The discovery of the Types-a and b | CHEN Liang ZHENG Quanan XIONG Xuejun YUAN Yeli XIE Huarong | 2018 | Acta Oceanologica Sinica2018，37，9： | 7 |
| 11 | Progress in research of submesoscale processes in the South China Sea显示文摘This paper overviews research progress in observation, theoretical analysis and numerical modeling of submesoscale dynamic processes in the South China Sea(SCS) particularly during recent five years. The submesoscale processes are defined according to both spatial and dynamic scales, and divided into four subcategories as submesoscale waves, submesoscale vortexes, submesoscale shelf processes, and submesoscale turbulence. The major new findings are as follows.(1) Systematic mooring observations provide new insights into the solitary waves(ISWs) and the typhoon-forced near-inertial waves(NIWs), of which a new type of ISWs with period of 23 h was observed in the northern SCS(NSCS), and the influences of background vorticity, summer monsoon onset, and deep meridional overturning circulation on the NIWs, as well as nonlinear wave-wave interaction between the NIWs and internal tides, are better understood. On the other hand, satellite altimeter sea surface height data are used to reveal the internal tide radiation patterns and provide solid evidence for that the ISWs in the northeastern SCS originate from the Luzon Strait.(2) Submesoscale offshore jets and associated vortex trains off the Vietnam coast in the western boundary of the SCS were observed from satellite chlorophyll concentration images. Spiral trains with the horizontal scale of 15–30 km and the spacing of 50–80 km were identified.(3) 3-D vertical circulation in the upwelling region east of Hainan Island was theoretically analyzed. The results show that distribution patterns of all the dynamic terms are featured by wave-like structures with horizontal wavelength scale of 20–40 km.(4) Numerical models have been used for the research of submesoscale turbulence. Submesoscale vertical pump of an anticyclonic eddy and the spatiotemporal features of submesoscale processes in the northeastern SCS are well modeled. | Quanan Zheng Lingling Xie Xuejun Xiong Xiaomin Hu Liang Chen | 2020 | Acta Oceanologica Sinica2020，39，1： | 7 |
| 12 | Evaluation of ENVISAT ASAR data for sea surface wind retrieval in Hong Kong coastal waters of China显示文摘The C-band wind speed retrieval models,CMOD4,CMOD-IFR2,and CMOD5 were applied to retrieval of sea surface wind speeds from ENVISAT(European environmental satellite)ASAR(advanced synthetic aperture radar)data in the coastal waters near Hong Kong during a period from October 2005 to July 2007.The retrieved wind speeds are evaluated by comparing with buoy measurements and the QuikSCAT(quick scatterometer)wind products.The results show that the CMOD4 model gives the best performance at wind speeds lower than 15 m/s.The correlation coefficients with buoy and QuikSCAT winds are 0.781 and 0.896,respectively.The root mean square errors are the same 1.74 m/s.Namely,the CMOD4 model is the best one for sea surface wind speed retrieval from ASAR data in the coastal waters near Hong Kong. | XU Qinga LIN Hui ZHENG Quanan XIU Peng CHENG Yongcun LIU Yuguang | 2008 | Acta Oceanologica Sinica2008，27，4： | 7 |
| 13 | New insight into the South China Sea:Rossby normal modes显示文摘The South China Sea(SCS),the largest marginal sea of the Northwest Pacific Ocean,is characterized by frequent occurrence of energetic mesoscale eddies.The eddy diameters range from 100 to 300 km.The eddy lifespan varies from several days to several months with the longest time of seven months(Zheng et al.,2017).The eddy disturbance reaches down to the ocean bottom layer. | XIE Lingling ZHENG Quanan | 2017 | Acta Oceanologica Sinica2017，36，7： | 6 |
| 14 | A case study of a Kuroshio main path cut-off event and impacts on the South China Sea in fall-winter 2013–2014显示文摘This study examines a Kuroshio main path(KMP) cut-off event east of Taiwan Island occurred in fall-winter2013–2014 and its impacts on the South China Sea(SCS) by analyzing satellite altimetry and mooring observations. Satellite altimeter sea level anomaly(SLA) images reveal a complete process that a huge cyclonic eddy(CE) from the Pacific collided with the Kuroshio and the western boundary from 15 October 2013 to 15 January 2014. Mooring observations evidenced that the Kuroshio upper ocean volume transport was cut off more than 82% from 17×106 m^3/s in September to 3×106 m^3/s in November 2013. The KMP cut-off event caused the Kuroshio branching and intruding into the SCS and strengthened the eddy kinetic energy in the northern SCS west of the Luzon Strait. Using the total momentum as a dynamic criterion to determine the role of eddy collision with the Kuroshio reasonably explains the KMP cut-off event. | Quanan Zheng Chung-Ru Ho Lingling Xie Mingming Li | 2019 | Acta Oceanologica Sinica2019，38，4： | 6 |
| 15 | Three-dimensional structure of a low salinity tongue in the southern Taiwan Strait observed in the summer of 2005显示文摘Cruise observations with CTD (conductivity-temperature-depth) profiler were carried out in the southern Taiwan Strait in the summer of 2005. Using the cruise data, two-dimensional maps of salinity and temperature distributions at depths of 5, 10, 15, 20, and 30 m were generated. The maps show a low salinity tongue sandwiched by low temperature and high salinity waters on the shallow water side and high temperature and high salinity waters on the deep water side. The further analysis indicates that the low salinity water has a nature of river-diluted water. A possible source of the diluted water is the Zhujiang (Pearl) Estuary. Meanwhile, the summer monsoon is judged as a possible driving force for this northeastward jet-like current. The coastal upwelling and the South China Sea Warm Current confine the low salinity water to flow along the central line of the strait. Previous investigations and a numerical model are used to verify that the upstream of the low salinity current is the Zhujiang Estuary. Thus, the low salinity tongue is produced by four major elements: Zhujinag Estuary diluted water, monsoon wind driving, coastal upwelling and South China Sea Warm Current modifications. | HONG Huasheng ZHENG Quanan HU Jianyu CHEN Zhaozhang LI Chunyan JIANG Yuwu WAN Zhenwen | 2009 | Acta Oceanologica Sinica2009，28，4： | 6 |
| 16 | Microstructure and mechanical properties of Mg-6Al magnesium alloy with yttrium and neodymium显示文摘The effects of rare earth(RE) elements Y and Nd on the microstructure and mechanical properties of Mg-6Al magnesium alloy were investigated.The results show that a proper level of RE elements can obviously ref ine the microstructure of Mg-6Al magnesium alloys,reduce the quantity of β-Mg17Al12 phase and form Al2Y and Al2Nd phases.The combined addition of Y and Nd dramatically enhances the tensile strength of the alloys in the temperature range of 20-175℃.When the content of RE elements is up to 1.8%,the values of tensile strength at room temperature and at 150℃ simultaneously reach their maximum of 253 MPa and 196 MPa,respectively.The main mechanisms of enhancement in the mechanical properties of Mg-6Al alloy with Y and Nd are the grain ref ining strengthening and the dispersion strengthening. | Chen Jun Li Quanan Li Jianghong Li Xiaofeng Li Kejie Zhang Xingyuan | 2009 | China Foundry2009，6，2： | 5 |
| 17 | Wavelet analysis of coastal-trapped waves along the China coast generated by winter storms in 2008显示文摘This study applies the wavelet analysis to the tidal gauge records, alongshore winds, atmospheric temperature and pressure along the China coast in winter 2008. The analysis results show three events of sea level oscillations(SLOs) on the shelf induced by winter storms. The first event occurred from January 9 to 21. The SLO periods were double-peaked at 1.6–5.3 and 7.0–16.0 d with the power densities of 0.04–0.05 and 0.10–0.15 m2·d, respectively.The second event occurred from February 5 to 18. The SLO period was single-peaked at 2.3–3.5 d with power density of 0.03–0.04 m2·d. The third event occurred from February 20 to March 8. The SLO periods were doublepeaked at 1.5–4.3 and 6.1–8.2 d with the power densities of 0.08–0.11 and 0.02–0.08 m2·d, respectively. The SLOs propagated along the coast from Zhejiang in north to Guangdong in south. The phase speeds ranged about 9–29m/s from Kanmen to Pingtan, 5–11 m/s from Xiamen to Huizhou and 11–22 m/s from Huizhou to Shuidong. The dispersion relation of the SLOs shows their nature of coastal-trapped wave. | LI Junyi ZHENG Quanan HU Jianyu FAN Zhenhua ZHU Jia CHEN Tao ZHU Benlu XU Ying | 2015 | Acta Oceanologica Sinica2015，34，11： | 5 |
| 18 | Classification and 3-D distribution of upper layer water masses in the northern South China Sea显示文摘Using the fuzzy cluster analysis and the temperature-salinity(T-S) similarity number analysis of cruise conductivity-temperature-depth(CTD) data in the upper layer(0–300 m) of the northern South China Sea(NSCS), we classify the upper layer water of the NSCS into six water masses: diluted water(D), surface water(SS),the SCS subsurface water mass(U_S), the Pacific Ocean subsurface water mass(U_P), surface-subsurface mixed water(SU) and subsurface-intermediate mixed water(UI). A new stacked stereogram is used to illustrate the water mass distribution, and to examine the source and the distribution of U_P, combining with the sea surface height data and geostrophic current field. The results show that water mass U_P exists in all four seasons with the maximum range in spring and the minimum range in summer. In spring and winter, the U_P intrudes into the Luzon Strait and the southwest of Taiwan Island via the northern Luzon Strait in the form of nonlinear Rossby eddies, and forms a high temperature and high salinity zone east of the Dongsha Islands. In summer, the U_P is sporadically distributed in the study area. In autumn, the U_P is located in the upper 200 m layer east of Hainan Island. | Jia Zhu Quanan Zheng Jianyu Hu Hongyang Lin Dewen Chen Zhaozhang Chen Zhenyu Sun Liyan Li Hao Kong | 2019 | Acta Oceanologica Sinica2019，38，4： | 5 |
| 19 | On generation source sites of internal waves in the Luzon Strait显示文摘This effort aims to determine the generation source sites in the Luzon Strait for energetic,long-crest,transbasin internal waves(IW)observed in the northern South China Sea(NSCS).The roles of islands distributed on eastern side of the strait,Kuroshio,submarine ridges,shoaling thermocline,and strait configuration played in the IW generation are examined using the cruise data analysis,satellite data interpretation,and dynamical analysis.The islands and channels on eastern side of the strait are excluded from a list of possible IW source sites owing to their unmatched horizontal dimensions to the scale of IW crest line length,and the relative low Reynolds number.The Kuroshio has a potential to be a radiator for the long-crest IW disturbances,meanwhile,the Kuroshio west(east)wing absorbs the eastward(westward)propagating IW disturbance.Namely,the Kuroshio blockades the outside west-east propagating IW disturbances.The 3-D configuration of the Luzon Strait is characterized by a sudden,more than one order widening of the cross-section areas at the outlets on both sides,providing a favorable condition for IW type initial disturbance formation.In the Luzon Strait,the thermocline is featured by a westward shoaling all the year around,providing the dynamical conditions for the amplitude growth(declination)to the westward(eastward)propagating IW type disturbance.Thus,the west slope of western submarine ridge at the western outlet of the Luzon Strait is a high possibility source sites for energetic,long-crest,transbasin IWs in the NSCS.The interpretation results of satellite SAR images during a 13 a period from 1995 to 2007 provide the convincing evidence for the conclusions. | ZHENG Quanan SONG Y Tony LIN Hui HU Xiaomin MENG Junmin WANG Dan | 2008 | Acta Oceanologica Sinica2008，27，3： | 5 |
| 20 | Statistical analysis of mesoscale eddy propagation velocity in the South China Sea deep basin显示文摘Using mesoscale eddy trajectory product derived from satellite altimetry data from 1993 to 2017,this study analyzes the statistical characteristics of spatiotemporal distribution of mesoscale eddy propagation velocities(C)in the South China Sea(SCS)deep basin with depths>1000 m.Climatologically,the zonal propagation velocities(cx)are westwards in the whole basin,and the meridional velocities(cy)are southwards in the northwestern basin,and northwards in the southeastern basin.The variation of cy with longitude is consistent with that of the background meridional currents with correlation coefficient R2 of 0.96,while the variation of cx is related both to the background zonal currents andβeffect.The propagation velocities characterize significant seasonality with the minimum magnitude occurring in summer and the maximum in winter for cx and C.Interannually,larger values of cx and cy mostly occurred in La Ni?a years in the negative phase of the Pacific Decadal Oscillation(PDO).Mesoscale eddies move fast at the beginning and end of their life span,i.e.,at their growth and dissipation periods,and slowly during their stable'midlife'period.This trend is negatively correlated with the rotating tangential velocity with R2 of–0.93.Eddies with extreme propagation velocities are defined,which are slower(faster)than 1.5 cm/s(15.4 cm/s)and take 1.5%(1.9%)of the total eddies.The extremely slow-moving(fastmoving)eddies tend to appear in the middle(on the edge)of the basin,and mostly occur in summer(winter).The mechanism analysis reveals that the spatiotemporal distributions of the propagation velocities of mesoscale eddies in the SCS are modulated by the basin-scale background circulation. | Runqi Huang Lingling Xie Quanan Zheng Mingming Li Peng Bai Keyi Tan | 2020 | Acta Oceanologica Sinica2020，39，11： | 4 |
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