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Frontsand strong currents of the upper southeast Indian Ocean

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Acta Oceanologica Sinica 2006年第2期25卷 1-24页

作者： he zhigang DONG Zhaoqian YUAN Xiaojun Department of Oceanography Xiamen University Xiamen 361005 China Polar Research Institute of China Shanghai 200136 China Lamont-Doherty Earth Observatory Columbia University Palisades New York NY 10964-800 USA

Hydrographic data, ADCP velocity and sea level anomaly derived from the satellite altimeter have been jointly analyzed in the southeast lndian Ocean. Results show the locations and orientations of the major oceanic fronts as well as the characteristics of the currents within these fronts in the area. Double subtropical fronts are observed in the section along 120°E, which conflicts with the frontal structure frequently observed before the North Subtropical Front （NSTF） and South Subtropical Front （SSTF） merge into a single STF between 110°-115°E. The Subantarctic Front （SAF）, influenced by the out-of-phase double eddies, runs across 48°S three times between 120° and 127°E. The surface current within the SAF is strengthened up to 105.4 cm/s by the geostrophic effect of these eddies. Furthermore eddies may cause the strong current to split up into two branches within the SAF. The SAF and the primary polar front （PFI） can be identified individually in the ADCP data with a separation distance of about 0.3° at latitude between 140° and 145°E, although they cannot be identified separately in the low-resolution hydrographic data. The different thcrmohaline characteristics of Circumpolar Deep Water （CDW） and Modified Circumpolar Deep Water （MCDW） result in the formation of Southern Antarctic Circumpolar Current Front （SACCF） in the southeast Indian Ocean. It consistently turns northward along the east flank of the Kerguclen Plateau after it runs through the Princess Elizabeth Trough and turns southward sharply north of 60°S with a little seasonal variations. It is shown that the locations and orientations of the SAK the primary PF and SACCF in the ACC of the southeast Indian Ocean can be identified more precisely by the current distribution derived from ADCP data than by hydrographic data, because these fronts are usually accompanied by strong currents. However, the locations and orientations of the STF and the secondary PF are more difficult to be identified through cur

关键词： southeast Indian Ocean front jet

Spring mesoscale high in the western South China Sea

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Acta Oceanologica Sinica 2013年第6期32卷 1-5页

作者： he zhigang ZHANG Yan WANG Dongxiao State Key Laboratory of Tropical Oceanography (LTO) South China Sea Institute of Oceanology Chinese Academy of Sciences College of Ocean and Earth Sciences Xiamen University South China Sea Marine Engineering Surveying Center South China Sea Branch State Oceanic Administration

A recurring spring mesoscale eddy in the western South China Sea （SCS） is studied using remote sensing data and historical in situ observations. The feature first appears east of the central Vietnam coast in Febru- ary as a high sea-level anomaly, grows rapidly to a well-developed anticyclonic eddy by March, matures in April, and decays in May. Besides the warm-core feature, it also has an inherent low-salinity property, so it is named ＂spring mesoscale high （SMH）＂. Though with clear interannual variation in terms of intensity and spatial coverage, the SMH always emerges in the region between ll0~E and l14~E and between 12~N and 16~N. The formation of SMH is ascribed to the combined effects of wind forcing and releasing of po- tential energy set up by winter monsoon. In particular, the wind-stress curl plays an important role in its development, maintenance, and dissipation.

关键词： spring western South China Sea warm eddy

Wld^(S),Nmnats and axon degeneration-progress in the past two decades

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Protein & Cell 2010年第3期1卷 237-245页

作者： Yan Feng Tingting Yan zhigang he Qiwei Zhai Key Laboratory of Nutrition and Metabolism Institute for Nutritional SciencesShanghai Institutes for Biological SciencesShanghai 200031China Graduate School of Chinese Academy of Sciences Chinese Academy of SciencesShanghai 200031China F.M.Kirby Neurobiology Center Children's Hospitaland Department of NeurologyHarvard Medical SchoolBostonMA 02115USA

A chimeric protein called Wallerian degeneration slow(Wld^(S))was first discovered in a spontaneous mutant strain of mice that exhibited delayed Wallerian *** provides a useful tool in elucidating the mechanisms of axon ***-expression of WldS attenuates the axon degeneration that is associated with several neurodegenerative disease models,suggesting a new logic for developing a potential protective *** molecular level,although Wld^(S)is a fusion protein,the nicotinamide mononucleotide adenylyl transferase 1(Nmnat1)is required and sufficient for the protective effects of Wld^(S),indicating a critical role of NAD biosynthesis and perhaps energy metabolism in axon *** findings challenge the proposed model in which axon degeneration is operated by an active programmed process and thus may have important implication in understanding the mechanisms of *** this review,we will summarize these recent findings and discuss their relevance to the mechanisms of axon degeneration.

关键词： axon degeneration Wallerian degeneration Wld^(S) NAD neurodegenerative diseases

Fronts and surface zonal geostrophic current along 115°E in the southern Indian Ocean

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Acta Oceanologica Sinica 2010年第5期29卷 1-9页

作者： he zhigang DONG Zhaoqian South China Sea Institute of Oceanology Guangzhou 510301 Polar Research Institute of China Shanghai 200136

Altimeter and in situ data are used to estimate the mean surface zonal geostrophic current in the section along 115°E in the southern Indian Ocean,and the variation of strong currents in relation to the major fronts is *** results show that,in average,the flow in the core of Antarctic Circumpolar Current（ACC） along the section is composed of two parts,one corresponds to the jet of Subantarctic Front（SAF） and the other is the flow in the Polar Front Zone（PFZ）,with a westward flow between *** mean surface zonal geostrophic current corresponding to the SAF is up to 49 cm · s^-1 at 46°S,which is the maximal velocity in the *** eastward flow in the PFZ has a width of about 4.3 degrees in *** mean surface zonal geostrophic current corresponding to the Southern Antarctic Circumpolar Current Front（SACCF） is located at 59.7 °S with velocity less than 20 cm · s^-*** location of zonal geostrophic jet corresponding to the SAF is quite stable during the study *** contrast,the eastward jets in the PFZ exhibit various patterns,i.e.,the primary Polar Front（PF1） shows its strong meridional shift and the secondary Polar Front（PF2） does not always coincide with *** surface zonal geostrophic current corresponding to SAF has the significant periods of annual,semi-annual and *** geostrophic current of the PFZ also shows significant periods of semi-annual and four-month,but is out of phase with the periods of the SAF,which results in no notable semi-annual and fourmonth periods in the surface zonal geostrophic current in the core of the *** terms of annual cycle,the mean surface zonal geostrophic current in the core of the ACC shows its maximal velocity in June.

关键词： southern Indian Ocean Antarctic Circumpolar Current zonal geostrophic current front

Major parameter measurement of high-brightness injector in hefei Light Source

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Nuclear Science and Techniques 2011年第4期22卷 200-204页

作者： WANG Xiaohui he zhigang SUN Baogen JIA Qika School of Nuclear Science and Technology & National Synchrotron Radiation Laboratory University of Science and Technology of China HeJei 230029 China

A photocathode radio frequency gun,which is an S-band normal conducting 1.6 copper cell cavity with water cooling system,was installed in hefei Light *** order to know its characteristics and get it into normal operation,continuous conditioning was conducted in the last few *** charge and dark current charge were measured using integrating current *** beam transverse size was determined as 1.63 mm in minimum using YAG screen and GigE Vision *** multi-slits technique,the transverse emittance was measured and normalized at 1.95 mm·mrad with beam charge of 240 *** results provide a way to optimize the facility.

关键词：参数测量合肥光源喷油器高亮度水冷却系统电流互感器 YAG激光正常运行

Mesoscale oceanic eddies in the South China Sea from 1992 to 2012:evolution processes and statistical analysis

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Acta Oceanologica Sinica 2014年第11期33卷 36-47页

作者： DU Yunyan YI Jiawei WU Di he zhigang WANG Dongxiao LIANG Fuyuan State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences State Key Laboratory of Tropical Oceanography (LTO) South China Sea Institute of OceanologyChinese Academy of Sciences College of Ocean and Earth Sciences Xiamen University Department of Geography Western Illinois University

Automated identification and tracking of mesoscale ocean eddies has recently become one research hotspot in physical oceanography. Several methods have been developed and applied to survey the general kinetic and geometric characteristics of the ocean eddies in the South China Sea（SCS）. However, very few studies attempt to examine eddies＇ internal evolution processes. In this study, we reported a hybrid method to trace eddies＇ propagation in the SCS based on their internal structures, which are characterized by eddy centers, footprint borders, and composite borders. Eddy identification and tracking results were represented by a GIS-based spatiotemporal model. Information on instant states, dynamic evolution processes, and events of disappearance, reappearance, split, and mergence is stored in a GIS database. Results were validated by comparing against the ten Dongsha Cyclonic Eddies（DCEs） and the three long-lived anticyclonic eddies（ACEs） in the northern SCS, which were reported in previous literature. Our study confirmed the development of these eddies. Furthermore, we found more DCE-like and ACE-like eddies in these areas from 2005 to 2012 in our database. Spatial distribution analysis of disappearing, reappearing, splitting, and merging activities shows that eddies in the SCS tend to cluster to the northwest of Luzon Island, southwest of Luzon Strait, and around the marginal sea of Vietnam. Kuroshio intrusions and the complex sea floor topography in these areas are the possible factors that lead to these spatial clusters.

关键词： mesoscale eddies identification and tracking algorithms spatiotemporal model eddy splitting and merging South China Sea

Broadband,Polarization-Sensitive,and Self-Powered High-Performance Photodetection of hetero-Integrated MoS_(2)on Lithium Niobate

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Research 2024年第2期2023卷 203-212页

作者： zhigang he heyuan Guan Xijie Liang Junteng Chen Manyan Xie Kaiwen Luo Ran An Liang Ma Fengkai Ma Tiefeng Yang Huihui Lu Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan UniversityGuangzhou 510632China Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China institute of Fluid Physics China Academy of Engineering PhysicsMianyang 621900China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421008China

High-performance photodetectors hold promising potential in optical communication and imaging ***,conventional counterparts are suffering narrow detection range,high power consumption,and poor polarization *** originating from switchable polarization in ferroelectrics can be used to optimize the photo-to-electric procedure and improve the photodetection *** this regard,we constructed a configuration by integrating 2-dimensional molybdenum disulfide(MoS_(2))with ferroelectric lithium niobate(LiNbO_(3)),resulting in the MoS_(2)/LiNbO_(3)heterostructured *** from the pyroelectric effect of LiNbO_(3),the limitation of bandgap on the detection range can be broken,thus broadening the response band of the detector to 365 to 1,064 nm,as well as enabling the self-powered ***,high carrier mobility and decent light absorbance of MoS_(2)introduce robust light-matter interactions with the underlying LiNbO_(3),leading to ultrafast rise/fall times of≈150μs/250μs and switching ratios of up to≈***,the highest responsivity,specific detectivity,and external quantum efficiency achieved were 17.3 A·W^(-1),4.3×10^(11)Jones,and 4,645.78%,***,because of the anisotropy of the spontaneous-polarized LiNbO_(3)substrate,the photocurrent of the device achieved a dichroic ratio of 7.42,comparing favorably to most MoS_(2)-based *** work demonstrates the integration potential between ferroelectric LiNbO_(3)and 2-dimensional materials for high-performance photodetection.

关键词： polarization ferroelectric Polarization

A New Way to Look into Literature——Comment on Structuralist Literary Criticism

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鄂西大学学报(社会科学版) 1987年第4期 75-79页

作者： he zhigang

What is structruralism?Is it a school or a movement?Many critics agreethat structruralism is,in a broad sense,a revolution in the human *** is,as Barthe,properly defined in,the activity of re-defining all the cultural phenomena,an activity grounded in the belief th-at like language,a myth,wrestling match,system of tribal kinship orrestaurant menu is a system of signs,In this connection,structuralism ismuch concerned with and influenced by the modern schools of linguisticsespecially by the structural linguistics originated by Sausure.

关键词： A New Way to Look into Literature Comment on Structuralist Literary Criticism

Dietary Leucine Requirement for Juvenile Large Yellow Croaker Pseudosciaena crocea (Richardson,1846)

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Journal of Ocean University of China 2010年第4期9卷 371-375页

作者： LI Yan AI Qinghui MAI Kangsen XU Wei CheNG Zhenyan he zhigang The Key Laboratory of Mariculture Ministry of Education of China Ocean University of China Qingdao 266003 P. R. China

Dietary leucine requirement for juvenile large yellow croaker, Pseudosciaena crocea Richardson 1846 (initial body weight 6.0 g±0.1 g) was determined using dose-response *** isonitogenous (crude protein 43%) and isoenergetic (19 kJ g-1) practical diets containing six levels of leucine (Diets 1-6) ranging from 1.23% to 4.80% (dry matter) were made at about 0.7% increment of *** amino acid nitrogen was maintained by replacing leucine with glutamic *** groups of 60 individuals were fed to apparent satiation by hand twice daily (05:00 and 17:30).The water temperature was 26-32℃, salinity 26-30 and dissolved oxygen approximately 7 mg L-1 during the experimental *** weight (FW) of large yellow croaker initially increased with increasing level of dietary leucine but then decreased at further higher level of *** highest FW was obtained in fish fed diet with 3.30% Leucine (Diet 4).FW of fish fed the diet with 4.80% Leucine (Diet 6) was significantly lower than those fed Diet ***, no significant differences were observed between the other dietary *** efficiency (FE) and whole body composition were independent of dietary leucine contents (P>0.05).The results indicated that leucine was essential for growth of juvenile large yellow *** the basis of FW, the optimum dietary leucine requirement for juvenile large yellow croaker was estimated to be 2.92% of dry matter (6.79% of dietary protein).

关键词： Pseudosciaena crocea leucine requirement diets