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| 1 | Precise orbit determination of Beidou Satellites with precise positioning显示文摘Chinese Beidou satellite navigation system constellation currently consists of eight Beidou satellites and can provide preliminary service of navigation and positioning in the Asia-Pacific Region.Based on the self-developed software Position And Navigation Data Analysis(PANDA) and Beidou Experimental Tracking Stations (BETS),which are built by Wuhan University,the study of Beidou precise orbit determination,static precise point positioning (PPP),and high precision relative positioning,and differential positioning are carried out comprehensively.Results show that the radial precision of the Beidou satellite orbit determination is better than 10 centimeters.The RMS of static PPP can reach several centimeters to even millimeters for baseline relative positioning.The precision of kinematic pseudo-range differential positioning and RTK mode positioning are 2-4 m and 5-10 cm respectively,which are close to the level of GPS precise positioning.Research in this paper verifies that,with support of ground reference station network,Beidou satellite navigation system can provide precise positioning from several decimeters to meters in the wide area and several centimeters in the regional area.These promising results would be helpful for the implementation and applications of Beidou satellite navigation system. | SHI Chuang ZHAO QiLe LI Min TANG WeiMing HU ZhiGang LOU YiDong ZHANG HongPing NIU XiaoJi LIU JingNan | 2012 | Science China Earth Sciences2012，55，7： | 61 |
| 2 | Using repeated precise gps campaigns for research of present-day crustal movement and strain in the Qinghai-Tibetan Plateau显示文摘The problem of crustal movement in the Qing-hai-Tibetan Plateau is a hotstopic of the present-day international geodetic world. GPS observations in 1993, 1995 and 1997 are used to survey the three-dimensional displacement of GPS monitoring station in the Qinghai-Tibetan Plateau, and to calculate and analyze the present-day crustal movement and strain in the Qinghai-Tibetan Plateau. The result of repeated campaign shows that the crustal movement in the Qinghai-Tibetan Plateau is still compressing in the north and south directions, extending in the west and east directions, and uplifting in the vertical direction. The relative convergence velocity of the Himalayan block is approximately (19.5±1.7)mm/a, the strain velocity is about (5.5±6.0) mm/a, and the uplifting velocity is some (7.6±5.2) mm/a. The compression velocity of the Tibet block relative to Golmud in the north and south directions is (9.3±4.6) mm/a, the strain velocity of the middle part in the west and east directions is (15.6±6.3) mm/a, | LIU Jingnan XU Caijun SONG Chenghua SHI Chuang JIANG Weiping DONG Lixiang | 2001 | Chinese Science Bulletin2001，46，8： | 8 |
| 3 | Successful Production of an All-Female Common Carp (Cyprinus carpio L.) Population Using cyp17a1-Deficient Neomale Carp显示文摘Due to sexual dimorphism in the growth of certain cultured fish species,the production of monosex fishes is desirable for the aquaculture industry.Nowadays,the most widely practiced technique available for the mass production of monosex fish populations is sex steroid-induced sex reversal.Here,a novel strategy for the successful production of all-female(AF)common carp(Cyprinus carpio L.),to take advantage of the sexual dimorphism in growth documented in this species,has been developed using genetic engineering via single gene-targeting manipulation without any exogenous hormone treatments.Male and female heterozygous cyp17a1-deficient common carp were first obtained using the clustered regularly interspaced short palindromic repeats/CRISPR-associated endonuclease 9(CRISPR/Cas9)technique.An all-male phenotype for homozygous cyp17a1-deficient carp,regardless of the individuals’sexdetermination genotypes(XY or XX),has been observed.A male-specific DNA marker newly identified in our laboratory was used to screen the neomale carp population with the XX genotype from the cyp17a1-deficient carp.These neomale carp develop a normal testis structure with normal spermatogenesis and sperm capacity.The neomale common carp were then mated with wild-type(WT)females(cyp17a1^(+/+)XX genotype)using artificial fertilization.All the AF offspring sample fish from the neomale-WT female mating were confirmed as having the cyp17a^(1+/-)XX genotype,and normal development of gonads to ovaries was observed in 100.00%of this group at eight months post-fertilization(mpf).A total of 1000 carp fingerlings,500 from the WT male and female and 500 from the neomale and WT female mating,were mixed and reared in the same pond.The average body weight of cyp17a1^(+/-)XX females was higher by 6.60%(8 mpf)and 32.66%(12 mpf)than that of the control common carp.Our study demonstrates the first successful production of a monosex teleost population with the advantages of sexual dimorphism in growth using genetic manipulation targeting a single locus. | Gang Zhai Tingting Shu Kuangxin Chen Qiyong Lou Jingyi Jia Jianfei Huang Chuang Shi Xia Jin Jiangyan He Donghuo Jiang Xueqiao Qian Wei Hu Zhan Yin | 2022 | Engineering2022，8，1： | 7 |
| 4 | Three new compounds from Sarcandra glabra显示文摘一新 sesquiterpene 内酯, 1,8,9-trihydroxyeudesman-3 (4 ) , 7 (11 )-dien-8,12-olide (1 ) 和二新代替 phenylpropanoid 的 catechin glycosides, glabraoside C (2 ) 和 glabraoside D (3 ) 从 Sarcandra glabra 的整个植物被孤立。他们的结构被分析建立光谱、化学证据。 | Chao Wang Yuan Li Chuang Jun Li Shi Shan Yu Dong Ming Zhang | 2012 | Chinese Chemical Letters2012，23，7： | 7 |
| 5 | Interspecific Differences in Diet between Introduced Red-eared Sliders and Native Turtles in China显示文摘Although the alien Red-eared slider(Trachemys scripta elegans) is generally argued as an invasive species that competes with native turtles,the fi eld evidence on its diet is controversial.Field studies conducted at the Gutian Nature Reserve of Guangdong and along the Wanquan River in Hainan,China show that T.s.elegans is an opportunitic omnivore,consuming a wide variety of food items.Consumption varies throughout its range;more plant material is consumed in Guangdong,compared to a more carnivorous diet in Hainan;and juveniles are also found to have a more carnivorous diet than adults.This implies a high adaptability to new environment.Sympatric native Mauremys sinensis shows a more herbivorous diet and a narrower niche breadth(0.0260) in Hainan,plus a low niche overlap(0.3048) with T.s.elegans,providing a potential empty niche for the invasive T.s.elegans.Red-eared slider is also known to consume large quantities of native prey species to disrupt the ecological balance.It is imperative to understand the invasive nature of this species and the mechanisms by which it affects native ecology. | Jian WANG Haitao SHI Shijia HU Kai MA Chuang LI | 2013 | Asian Herpetological Research2013，4，3： | 7 |
| 6 | Separation and characterization of petroleum asphaltene fractions by ESI FT-ICR MS and UV-vis spectrometer显示文摘Using heptane, toluene, and tetrahydrofuran (THF) as eluant, asphaltenes were fractionated into five fractions based on their polarity and solubility. The molecular composition of polar heteroatom species in both asphaltene and its fractions were analyzed by negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS). The application of UV-vis spectrometer in characterizing asphaltene composition and measuring asphaltene concentration was discussed. About 11.9 wt% asphaltene components adsorbed permanently on silica gel in the extrography column after excessive elution with various solvents. In negative FT-ICR MS, the mass spectra show that acidic and neutral nitrogen-containing compounds such as N1 and N1S1 mainly existe in the first three less polar fractions, while oxygen-containing compounds such as O2 , O2S, O2S2 , O3 , and O4 show high relative abundance in more polar fractions. These results suggest oxygen-containing compounds have stronger adsorption ability with silica gel. It was observed that the double bond equivalence (DBE) distribution of N1 class species in the fractions shifted to higher values while the carbon number shifted to smaller numbers as polarity of fractions increased. This indicates that acidic and neutral N1 compounds with longer carbon chain and less aromaticity have less polarity compared with those with shorter carbon chain and stronger aromaticity. UV-vis absorbance indicats that fractions containing the most aromatic and most polar asphaltene have better absorbance at long wavelength, while the fractions that consist of least aromatic and least polar asphatlenes show high absorbance at short wavelength. | WANG ShanShan YANG Chuang XU ChunMing ZHAO SuoQi SHI Quan | 2013 | Science China Chemistry2013，56，7： | 6 |
| 7 | Spatio-temporal Difference and Influencing Factors of Environmental Adaptability Measurement of Human-sea Economic System in Liaoning Coastal Area显示文摘Adaptability theory is an important tool to analyze the degree, mechanism and process of interaction between human and environment, which provides a new perspective for the research of sustainability assessment. Based on the entropy weight-TOPSIS method and the panel Tobit model from the perspective of adaptability, spatio-temporal difference and influencing factors of environmental adaptability assessment of human-sea economic system in Liaoning coastal area was measured by using the city panel data from 2000 to 2014. The results indicate that: 1) The environmental adaptability of human-sea economic system in Liaoning coastal area rose slowly from 2000 to 2014, the developing trend of each city was linearly related, and Dalian was in a leading position. 2) The different adaptability elements and adaptability subsystem show polarization phenomenon and completely different regional evolution characteristics. The adaptability of human-sea environment system and human-sea economic system rose slowly and had the characteristics of linear relationship, and the adaptability of human-sea environment system is the main reason for the difference of environmental adaptability of human-sea economic system. 3) Science and technology, environmental management, marine economic development level, port construction are the driving factors of the healthy development of environmental adaptability of urban human-sea economic system. | LI Bo SHI Zhaoyuan TIAN Chuang | 2018 | Chinese Geographical Science2018，28，2： | 6 |
| 8 | Correlation-weighted least squares residual algorithm for RAIM显示文摘The Least Squares Residual(LSR)algorithm,one of the classical Receiver Autonomous Integrity Monitoring(RAIM)algorithms for Global Navigation Satellite System(GNSS),presents a high Missed Detection Risk(MDR)for a large-slope faulty satellite and a high False Alarm Risk(FAR)for a small-slope faulty satellite.From the theoretical analysis of the high MDR and FAR cause,the optimal slope is determined,and thereby the optimal test statistic for fault detection is conceived,which can minimize the FAR with the MDR not exceeding its allowable value.To construct a test statistic approximate to the optimal one,the CorrelationWeighted LSR(CW-LSR)algorithm is proposed.The CW-LSR test statistic remains the sum of pseudorange residual squares,but the square for the most potentially faulty satellite,judged by correlation analysis between the pseudorange residual and observation error,is weighted with an optimal-slope-based factor.It does not obey the same distribution but has the same noncentral parameter with the optimal test statistic.The superior performance of the CW-LSR algorithm is verified via simulation,both reducing the FAR for a small-slope faulty satellite with the MDR not exceeding its allowable value and reducing the MDR for a large-slope faulty satellite at the expense of FAR addition. | Dan SONG Chuang SHI Zhipeng WANG Cheng WANG Guifei JING | 2020 | Chinese Journal of Aeronautics2020，33，5： | 6 |
| 9 | A Systematic Assessment of Blood Lead Level in Children and Associated Risk Factors in China显示文摘In this study, we searched multiple databases for all relevant original articles (1996-2013). To investigate blood lead levels (BLL) and possible risk factors for lead exposure among children in China A total of 388 articles met our inclusion criteria. The overall geometric mean (GM) BLL was 71 IJ.g/L, and the prevalence of elevated BLL (EBLL, defined as BLL 〉_100 Ixg/L) was l&.4&% among children. The prevalence of EBLL remained significantly higher among boys. In children less than 6 years of age, there were significantly increasing trends in both BLL and prevalence of EBLL in an age-dependent manner. The ban on leaded gasoline significantly reduced the BLL as well as EBLL prevalence; however, children whose parents had lower educational levels or were exposed to lead in the workplace had a higher EBLL prevalence. Despite its decline over time, the average BLL among children in China remains higher than the average level most recently reported in the United States. Childhood lead poisoning remains a public health problem in China. | WANG Lu LI Zhen HUANG Shao Xin DU Chuang WANG Hong HE Li Ping BI Yong Yi SHI Yong WANG Chun Hong | 2015 | Biomedical and Environmental Sciences2015，28，8： | 6 |
| 10 | Recent Advances in Space-Deployable Structures in China显示文摘Deployable space structure technology is an approach used in building spacecraft,especially when realizing deployment and folding functions.Once in orbit,the structures are released from the fairing,deployed,and positioned.With the development of communication,remote-sensing,and navigation satellites,space-deployable structures have become cutting-edge research topics in space science and technology.This paper summarizes the current research status and development trend of spacedeployable structures in China,including large space mesh antennas,space solar arrays,and deployable structures and mechanisms for deep-space exploration.Critical technologies of space-deployable structures are addressed from the perspectives of deployable mechanisms,cable-membrane form-finding,dynamic analysis,reliable environmental adaptability analysis,and validation.Finally,future technology developments and trends are elucidated in the fields of mesh antennas,solar arrays,deployable mechanisms,and on-orbit adjustment,assembly,and construction. | Xiaofei Ma Tuanjie Li Jingya Ma Zhiyi Wang Chuang Shi Shikun Zheng Qifeng Cui Xiao Li Fan Liu Hongwei Guo Liwu Liu Zuowei Wang Yang Li | 2022 | Engineering2022，，10： | 6 |
| 11 | Effect of long-term weightlessness on retina and optic nerve in tail-suspension rats显示文摘AIM: To evaluate the effect of long-term weightlessness on retina and optic nerve in tail-suspension(TS) rats.METHODS: A stimulated weightlessness model was established by suspending rats' tail. After 12 wk, the ultrastructure and the number of optic nerve axons were observed by transmission electron microscope. The number of survival retinal ganglion cells(RGCs) was calculated by fluorescent gold retrograde labeling. Retina cells apoptosis was detected by TUNEL staining. The function of optic nerve and retina was evaluated by the visual evoked potential(VEP) and oscillatory potentials(Ops).RESULTS: The optic nerve axons were swollen and sparsely aligned, and the lamellar separation and myelin disintegration occurred after 12 wk in TS rats. The density of optic nerve axons was 32.23±3.92(vs 37.43±4.13, P =0.0145), the RGCs density was 1645 ±46 cells/mm2(vs1867±54 cells/mm2P=0.0000), the incidence rate of retinal cells apoptosis was 5.38%±0.53%(vs 4.75%±0.54%, P =0.0238), the amplitude of VEP-P100 was 15.43 ±2.14 μV(vs 17.67 ±2.17 μV, P =0.0424), the latency of VEP-P100 was 69.05±5.34ms(vs 62.43±4.87 ms P =0.0143) and the sum amplitude of Ops was 81.05 ±8.34 μV(vs 91.67 ±10.21 μV, P =0.0280) in TS group and the control group,respectively.CONCLUSION: Long-term weightlessness can induce the ultrastructural changes and functional depress of the optic nerve, as well as retinal cell damages in TS rats. | Hong-Wei Zhao Jun Zhao Lian-Na Hu Jing-Nan Liang Yuan-Yuan Shi Chuang Nie Chang-Yu Qiu Xin-Shuai Nan Yu-Xin Li Fu-Lin Gao Yi Liu Yu Dong Ling Luo | 2016 | International Journal of Ophthalmology(English edition)2016，9，6： | 5 |
| 12 | Induction of jasmonic acid biosynthetic genes inhibits Arabidopsis growth in response to low boron显示文摘The essential micronutrient boron(B) has key roles in cell wall integrity and B deficiency inhibits plant growth. The role of jasmonic acid(JA) in plant growth inhibition under B deficiency remains unclear. Here,we report that low B elevates JA biosynthesis in Arabidopsis thaliana by inducing the expression of JA biosynthesis genes. Treatment with JA inhibited plant growth and, a JA biosynthesis inhibitor enhanced plant growth, indicating that the JA induced by B deficiency affects plant growth. Furthermore,examination of the JA signaling mutants jasmonate resistant1, coronatine insensitive1-2, and myc2 showed that JA signaling negatively regulates plant growth under B deficiency. We identified a low-B responsive transcription factor, ERF018, and used yeast one-hybrid assays and transient activation assays in Nicotiana benthamiana leaf cells to demonstrate that ERF018 activates the expression of JA biosynthesis genes. ERF018 overexpression(OE)lines displayed stunted growth and up-regulation of JA biosynthesis genes under normal B conditions,compared to Col-0 and the difference between ERF018 OE lines and Col-0 diminished under low B.These results suggest that ERF018 enhances JA biosynthesis and thus negatively regulates plant growth. Taken together, our results highlight the importance of JA in the effect of low B on plant growth. | Yupu Huang Sheliang Wang Chuang Wang Guangda Ding Hongmei Cai Lei Shi Fangsen Xu | 2021 | Journal of Integrative Plant Biology2021，63，5： | 5 |
| 13 | Global modeling 2^(nd)-order ionospheric delay and its effects on GNSS precise positioning显示文摘Ionospheric delay is one of the major error sources in GNSS navigation and positioning.Nowadays,the dual-frequency technique is the most widely used in ionospheric refraction correction.However,dual-frequency measurements can only eliminate the first-order term of ionospheric delay,while the effect of the second-order term on GNSS observations may be several centimeters.In this paper,two models,the International Reference Ionosphere (IRI) 2007 and International Geomagnetic Reference Field (IGRF) 11 are used to estimate the second-order term through the integral calculation method.Besides,the simplified single layer ionosphere model in a dipole moment approximation for the earth magnetic field is used.Since the traditional integral calculation method requires large calculation load and takes much time,it is not convenient for practical use.Additionally,although the simplified single layer ionosphere model is simple to implement,it results in larger errors.In this study,second-order term ionospheric correction formula proposed by Hoque (2007) is improved for estimating the second-order term at a global scale.Thus,it is more practicable to estimate the second-order term.More importantly,its results have a higher precision of the sub-millimeter level for a global scale in normal conditions.Compared with Hoque's original regional correction model,which calculates coefficients through polynomial fitting of elevation and latitudes,this study proposes a piece-wise look-up table and interpolation technique to modify Hoque model.Through utilizing a table file,the modified Hoque model can be conveniently implemented in an engineering software package,like as PANDA in this study.Through applying the proposed scheme for the second-order ionospheric correction into GNSS precise positioning in both PPP daily and epoch solutions,the results have shown south-shift characteristics in daily solution at a global scale and periodic change with VTEC daily variation in epoch positioning solution. | ZHANG HongPing LV HaiXia LI Min SHI Chuang | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，6： | 5 |
| 14 | Epicenter and magnitude of large earthquake determined from high-rate GPS observations: A case study of the 2008 M8.0 Wenchuan earthquake显示文摘For earthquake and tsunami early warning and emergency response,the earthquake epicenter and magnitude should be determined rapidly and correctly.Using high-rate GPS observations,we can readily obtain precise and high resolution displacement time series and the seismic waveforms during the earthquake.In this paper,a new algorithm is proposed for estimating the earthquake epicenter and magnitude with the seismic waveforms derived from high-rate GPS data during the earthquake.A case study of the 2008 Wenchuan earthquake is conducted from 1 Hz GPS data and the epicenter and magnitude are determined.Compared with the results issued by the China Seismological Bureau,the estimation error of the epicenter and the magnitude is about 12 km and 0.1 magnitude unit,respectively.It has shown that high-rate GPS could be a new tool feasible for estimating the earthquake epicenter and magnitude,independent of or combined with seismometers. | FANG RongXin SHI Chuang WANG GuangXing LIU JingNan | 2014 | Science China Earth Sciences2014，57，7： | 5 |
| 15 | Estimation of Geodetic Parameters with VLBI Data of Last 5 Years显示文摘The meaning to research the potential of VLBI for geodetic applications is summarized. And the observation models and their related parameters of geodetic interest are investigated. Then, the principle and method of using the random model in VLBI data processing are investigated. With the world wide VLBI data from 2000-2004, the conditions to compute the parameters of geodetic interest are introduced, and so are the computing methods and processes. And the computed results of the parameters of geodetic interest are analyzed. | WEI Erhu LIU Jingnan SHI Chuang | 2007 | Geo-Spatial Information Science2007，10，1： | 4 |
| 16 | Multi-quadric Equations Interpolation and Its Applications to the Establishment of Crustal Movement Speed Field显示文摘In this paper,multi_quadric equations interpolation is used to establish a widely covered and valuable speed field model,with which the crustal movement image is obtained. | YAO Yibin LIU Jingnan SHI Chuang TAO Benzao | 2002 | Geo-Spatial Information Science2002，5，2： | 4 |
| 17 | Recent progress in perovskite solar cells:material science显示文摘Perovskite solar cells represent a promising third-generation photovoltaic technology with low fabrication cost and high power conversion efficiency.In light of the rapid development of perovskite materials and devices,a systematic survey on the latest advancements covering a broad range of related work is urgently needed.This review summarizes the recent major advances in the research of perovskite solar cells from a material science perspective.The discussed topics include the devices based on different type of perovskites(organic-inorganic hybrid,all-inorganic,and lead-free perovskite and perovskite quantum dots),the properties of perovskite defects,different type of charge transport materials(organic,polymeric,and inorganic hole transport materials and inorganic and organic electron transport materials),counter electrodes,and interfacial materials used to improve the efficiency and stability of devices.Most discussions focus on the key progresses reported within the recent five years.Meanwhile,the major issues limiting the production of perovskite solar cells and the prospects for the future development of related materials are discussed. | Jiang-Yang Shao Dongmei Li Jiangjian Shi Chuang Ma Yousheng Wang Xiaomin Liu Xianyuan Jiang Mengmeng Hao Luozheng Zhang Chang Liu Yiting Jiang Zhenhan Wang Yu-Wu Zhong Shengzhong(Frank)Liu Yaohua Mai Yongsheng Liu Yixin Zhao Zhijun Ning Lianzhou Wang Baomin Xu Lei Meng Zuqiang Bian Ziyi Ge Xiaowei Zhan Jingbi You Yongfang Li Qingbo Meng | 2023 | Science China Chemistry2023，66，1： | 3 |
| 18 | Mixed H_2/H_∞ State Feedback Attitude Control of Microsatellite Based on Extended LMI Method显示文摘For the appearance of the additive perturbation of controller gain when the controller parameter has minute adjustment at the initial running stage of system,to avoid the adverse effects,this paper investigates the mixed H_2/H_∞ state feedback attitude control problem of microsatellite based on extended LMI method.Firstly,the microsatellite attitude control system is established and transformed into corresponding state space form.Then,without the equivalence restriction of the two Lyapunov variables of H_2 and H∞performance,this paper introduces additional variables to design the mixed H_2/H_∞ control method based on LMI which can also reduce the conservatives.Finally,numerical simulations are analyzed to show that the proposed method can make the satellite stable within 20 s whether there is additive perturbation of the controller gain or not.The comparative analysis of the simulation results between extended LMI method and traditional LMI method also demonstrates the effectiveness and feasibility of the proposed method in this paper. | Keke Shi Chuang Liu Feng Wang Zhaowei Sun | 2016 | Journal of Harbin Institute of Technology(New Series)2016，23，5： | 2 |
| 19 | Comparison of Present SST Gravity Field Models显示文摘Taking the main land of Europe as the region to be studied, the potential of the new satellite gravity technique: satellite-to-satellite tracking (SST) and improving the accuracy of regional gravity field model with the SST models are investigated. The drawbacks of these models are discussed. With GPM98C as the reference, the gravity anomaly residuals of several other models, the latest SST global gravity field models (EIGEN series and GGM series), were computed and compared. The results of the comparison show that in the selected region, some systematic errors with periodical properties exist in the EIGEN and GGM’s S series models in the high degree and order. Some information that was not shown in the classic gravity models is detected in the low and middle degree and order of EIGEN and GGM’s S series models. At last, the effective maximum degrees and orders of SST models are suggested. | LUO Jia SHI Chuang ZOU Xiancai WANG Haihong | 2006 | Geo-Spatial Information Science2006，9，3： | 2 |
| 20 | Total least squares adjustment in partial errors-in-variables models: algorithm and statistical analysis显示文摘 | Peiliang Xu Jingnan Liu Chuang Shi | 2012 | Journal of Geodesy2012，，8： | 2 |
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