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Invasive black spiny-tailed iguanas(Ctenosaura similis)on Gasparilla Island,Florida,USA

Integrative Zoology 2014年第5期9卷 590-597页

作者： Michael L.AVERY Eric A.TILLMAN Conny SpURFELD Richard M.ENGEMAN kelin p.maciejewski Jessica D.BROWN Emily A.FETZER United States Department of Agriculture Wildlife Services(USDA-WS)National Wildlife Research CenterFlorida Field StationGainesvilleFloridaUSA USDA-WS GainesvilleFloridaUSA USDA-WS National Wildlife Research CenterFort CollinsColorado USA Berryman Institute Mississippi State UniversityStarkvilleMississippiUSA

The native range of Ctenosaura similis extends from southern Mexico through panama. From an initial introduction of 3 animals in 1979, the species now numbers in the thousands on Gasparilla Island in southwest Florida. In response to complaints of property damage from residents and threats to native species, local officials and the US Department of Agriculture Wildlife Services began a removal program in 2008. Through 2011, trappers removed 9467 ctenosaurs. The number removed declined from 32 iguanas/day in 2008 to 1.9 iguanas/day in 2011 despite no easing of the control effort. We necropsied 2757 ctenosaurs to document aspects of their natural history. Females outnumbered males overall, although the largest size class (>300 mm snout-vent length) included 32 males and just 2 females. Reproduction was seasonal. We found oviducal eggs in females from early Apr to early Jun, approximately 2 months later than C. similis in its native range. We trapped hatchlings from late Jul to early Oct coincident with the summer rainy season. Clutch size increased with female body size, with 62 being the largest clutch size recorded. In general, the biology of the invasive population on Gasparilla Island resembles native C. similis populations in Central America, except for the lack of large individuals. We suggest that shorter day length and colder temperatures create environmental conditions that are suboptimal for individual growth compared to those in the native range.

关键词： Ctenosaura similis Florida invasive reptile population control spiny-tailed iguana

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The 40Ca~+ ion optical clock

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National Science Review 2020年第12期7卷 1799-1801页

作者： kelin Gao Wuhan Institute of physics and Mathematics Chinese Academy of Sciences

Ever since the mid-twentieth century,atomic clocks have become the most accurate time and frequency standards *** 1967,the 13 th CGpM(General Conference of Weights and Measures) decided to replace the definition of the second by ’the duration of 9 192 631 770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the Cs-133 atom’.

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Variability in nanoscale CMOS technology

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Science China(Information Sciences) 2011年第5期54卷 936-945页

作者： KUHN kelin portland Technology Development Intel Corporation Hillsboro OR 97124 USA

Moore’s Law technology scaling has improved VLSI performance by five orders of magnitude in the last four decades. As advanced technologies continue the pursuit of Moore’s Law, a variety of challenges will need to be overcome. One of these challenges is management of process variation. This paper discusses the importance of process variation in modern CMOS transistor technology, reviews front-end variation sources, presents device and circuit variation measurement techniques (including circuit and SRAM data from the 32 nm node), and compares recent intrinsic transistor variation performance from the literature.

关键词： CMOS variation SRAM Vccmin

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Optical frequency standard based on a single ^(40)Ca^+

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Chinese Science Bulletin 2013年第8期58卷 853-863页

作者： GAO kelin State Key Laboratory of Magnetic Resonance and Atomic and Molecular physics Key Laboratory of Atomic Frequency Standards Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences

Research on the development of the optical frequency standard based on trapped and cold 40 Ca+ with the 4s2S1/2-3d2D5/2 clock transition at 729nm is reported. A single calcium ion was trapped and laser cooled in the paul trap and stay in trap for more than 15 days. The linewidth of a 729nm laser was reduced to less than 10Hz by locking to a cavity for longer than 50 hours uninterruptedly. The overall systematic uncertainty of the clock transition has been characterized to be better than 6.5×10 16 . The absolute frequency of the clock transition was measured at 10 15 level using an optical frequency comb referenced to a Hydrogen maser, which was calibrated to the SI second through the global positioning system (GpS). The frequency value was 411042129776393.0(1.6)Hz after the correction of the systematic shifts.

关键词：光学频率标准基全球定位系统激光冷却整体系统微波激射器频率标准不确定性

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Event-triggered cooperative target tracking in wireless sensor networks

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Chinese Journal of Aeronautics 2016年第5期29卷 1326-1334页

作者： Lu kelin Zhou Rui Li Hao School of Automation Science and Electrical Engineering Beihang University Beijing 100083 China AVIC Chengdu Aircraft Design & Research Institute Chengdu 610091 China

Since the issues of low communication bandwidth supply and limited battery capacity are very crucial for wireless sensor networks, this paper focuses on the problem of event- triggered cooperative target tracking based on set-membership information filtering. We study some fundamental properties of the set-membership information filter with multiple sensor measurements. First, a sufficient condition is derived for the set-membership information filter, under which the boundedness of the outer ellipsoidal approximation set of the estimation means is guaranteed. Second, the equivalence property between the parallel and sequential versions of the setmembership information filter is presented. Finally, the results are applied to a 1D eventtriggered target tracking scenario in which the negative information is exploited in the sense that the measurements that do not satisfy the triggering conditions are modelled as set-membership measurements. The tracking performance of the proposed method is validated with extensive Monte Carlo simulations.

关键词： Event-triggered Information filter Set-membership Target tracking Wireless sensor networks

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Mercury transportation in soil via using gypsum from flue gas desulfurization unit in coal-fired power plant

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Journal of Environmental Sciences 2013年第9期25卷 1858-1864页

作者： kelin Wang William Orndorff Yan Cao Weiping pan Institute for Combustion Science and Environmental Technology Western Kentucky University

The mercury flux in soils was investigated, which were amended by gypsums from flue gas desulphurization （FGD） units of coal- fired power plants. Studies have been carried out in confined greenhouses using FGD gypsum treated soils. Major research focus is uptakes of mercury by plants, and emission of mercury into the atmosphere under varying application rates of FGD gypsum, simulating rainfall irrigations, soils, and plants types. Higher FGD gypsum application rates generally led to higher mercury concentrations in the soils, the increased mercury emissions into the atmosphere, and the increased mercury contents in plants （especially in roots and leaves）. Soil properties and plant species can play important roles in mercury transports. Some plants, such as tall fescue, were able to prevent mercury from atmospheric emission and infiltration in the soil. Mercury concentration in the stem of plants was found to be increased and then leveled off upon increasing FGD gypsum application. However, mercury in roots and leaves was generally increased upon increasing FGD gypsum application rates. Some mercury was likely absorbed by leaves of plants from emitted mercury in the atmosphere.

关键词： flue gas desulphurization gypsums soils mercury emissions mercury uptakes mercury infiltration greenhouse tests

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Variational Calculation for Large Bipolarons in Arbitrary Dimensions

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Chinese physics Letters 1994年第6期11卷 361-364页

作者： CHEN Qinghu WAN Shaolong WANG kelin Center for Fundamental physics University of Science and Technology of ChinaHefei 230026

The calculation model of the large bipolaron binding energy proposed by Verbist et *** extended to arbitrary dimensions including fractal *** is found that the fractal dimension D=1.25 corresponds to the lowest critical coupling constantα_(c)=1.9,D=1.73 corresponds to the highest critical ratio of dielectric constantsη_(c)=0.163,and when D≤1.145 bipolarons can not exist for any coupling constants and ratios of dielectric constants.

关键词： constants constants fractal

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Fingerprinting sediment sources in a typical karst catchment of southwest China

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International Soil and Water Conservation Research 2020年第3期8卷 277-285页

作者： Zhenwei Li Xianli Xu Yaohua Zhang kelin Wang Huanjiang Observation and Research Station for Karst Ecosystem Key Laboratory for Agro-Ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha410125China University of Chinese Academy of Sciences Beijing100049China

Due to the complex hydrogeological conditions in karst regions,it is difficult to measure sediment source contributions at a catchment scale *** objective of this study was to quantify the relative contributions of sediment sources and their temporal variability in a karst catchment in southwest *** depressions can trap eroded sediment similar to a dam or reservoir and,thus,are representative and typical test beds for identifying sediment sources in karst *** sediment cores were taken from a karst depression,58 soil samples from three potential sediment sources were collected,and 18 soil properties were *** relative contributions of cropland,forestland,and fissure or crack soils were calculated using a multivariate mixing *** fingerprinting results demonstrated that the cropland was the main sediment source in karst ***,according to the mean sediment contributions of the three deposited sediment cores,the sediment contribution from cropland topsoil was 69.3%,varying from 46.9%to 92.3%,and forestland soil and crack soil accounted for 8.6%and 22.1%of the sediment yield,and varying from 2.8%to 16.5%and 4.8%-36.6%,*** result indicated that great attention should be paid when using only a single core to quantify sediment *** to the deposited sediment was generally disturbed as cropland in the karst depression,the area that has not been disturbed in recent decades in depression was more appropriate to trace sediment sources in karst *** the best of our knowledge,this study was the first to quantify the contributions of sediment sources in the karst catchment of southwest *** study provides valuable information and a preliminary reference for applying a composite fingerprinting technique to quantify sediment sources in karst catchments.

关键词： Soil erosion Sedimentation Sediment tracing Earth's critical zone Ecohydrology

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Bottom Simulating Reflector and Gas Seepage in Okinawa Trough:Evidence of Gas Hydrate in an Active Back-Arc Basin

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Journal of China University of Geosciences 2008年第2期19卷 152-161页

作者：栾锡武 kelin Wang Roy Hyndman Eleanor Willoughby Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences （IOCAS） Qingdao 266071 China pacific Geoscience Centre （pGC） Geological Survey of Canada Sidney V8L4B2 Canada

To look for gas hydrate, 22 multi-channel and 3 single-channel seismic lines on the East China Sea （ECS） shelf slope and at the bottom of the Okinawa Trough were examined. It was found that there was indeed bottom simulating reflector （BSR） occurrence, but it is very rare. Besides several BSRs, a gas seepage was also found. As shown by the data, both the BSR and gas seepage are all related with local geological structures, such as mud diapir, anticline, and fault-controlled graben-like structure. However, similar structural ＂anomalies＂ are quite common in the tectonically very active Okinawa Trough region, but very few of them have developed BSR or gas seepage. The article points out that the main reason is probably the low concentration of organic carbon of the sediment in this area. It was speculated that the rare occurrence of gas hydrates in this region is governed by structure-controlled fluid flow. Numerous faults and fractures form a network of high-permeability channels in the sediment and highly fractured igneous basement to allow fluid circulation and ventilation. Fluid flow in this tectonic environment is driven primarily by thermal buoyancy and takes place on a wide range of spatial scales. The fluid flow may play two roles to facilitate hydrate formation： to help gather enough methane into a small area and to modulate the thermal regime.

关键词： gas hydrate BSR gas seepage back-arc basin formation mechanism.

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A Soliton Solution for MHD Equation of Unmagnetized Collisionless plasma

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Chinese physics Letters 1993年第9期10卷 527-530页

作者： WANG kelin DING Weixing YU Changxuan Fuiidanientiil physics Center.University of Science and Teclinology of China Hefei 230026 Department of Modern physics University of Science and Technology of ChinaHefei 230026

A new theoretical method has been developed to deni with ion acoustic soliton in collisionless plasma,with cold ions(T_(e)>>T_(i)).The analytical soliton solution cfin be found from the magnetic hydrodynfimics equatio... 详细信息

关键词： equation soliton Soliton

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