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| 1 | Anti-disturbance control of hypersonic flight vehicles with input saturation using disturbance observer显示文摘This paper proposes an anti-disturbance control scheme for the near space vehicle(NSV) based on terminal sliding mode(TSM) technique and disturbance observer method. To tackle the system uncertainty and the time-varying unknown external disturbance of the NSV, a disturbance observer based on TSM technique is designed which can render the disturbance estimate error convergent in finite time. Furthermore, an auxiliary design system is introduced to analyze the input saturation effect. Based on the developed disturbance observer and the auxiliary design system, an anti-disturbance attitude control scheme is developed for the NSV using the TSM technique to speed up the convergence of all signals in closed-loop system. For the closed-loop system,the stability is rigorously proved by using the Lyapunov method and we guarantee the finite time convergence of all closed-loop system signals in the presence of the integrated affection of the system uncertainty, the input saturation, and the unknown external disturbance. Simulation study results are given to show the effectiveness of the developed TSM anti-disturbance attitude control scheme using the disturbance observer and the auxiliary system for the NSV. | CHEN Mou REN BeiBei WU QinXian JIANG ChangSheng | 2015 | Science China(Information Sciences)2015，58，7： | 21 |
| 2 | Guaranteed transient performance based control with input saturation for near space vehicles显示文摘This paper describes the design of guaranteed transient performance based attitude control for the near space vehicle(NSV)with control input saturation using the backstepping method.To improve the robust controllability of the NSV,the parameter adaptive method is used to tackle the integrated effect of unknown time-varying disturbance and control input saturation.Based on the backstepping technique and parameter estimated outputs,a robust attitude control scheme is proposed for the NSV with input saturation.A novel robust attitude control scheme is then proposed based on a prescribed performance bound(PPB)which characterizes the convergence rate and maximum overshoot of the attitude tracking error.The closed-loop system stability under both the developed robust attitude control schemes is proved using Lyapunov’s method and uniformly asymptotical convergence of all closed-loop signals is guaranteed.Finally,simulation results are given to show the effectiveness of both the proposed robust constrained attitude control schemes. | CHEN Mou WU QinXian JIANG ChangSheng JIANG Bin | 2014 | Science China(Information Sciences)2014，57，5： | 19 |
| 3 | Adaptive fuzzy tracking control for a class of uncertain MIMO nonlinear systems using disturbance observer显示文摘In this paper,the adaptive fuzzy tracking control is proposed for a class of multi-input and multioutput(MIMO)nonlinear systems in the presence of system uncertainties,unknown non-symmetric input saturation and external disturbances.Fuzzy logic systems(FLS)are used to approximate the system uncertainty of MIMO nonlinear systems.Then,the compound disturbance containing the approximation error and the timevarying external disturbance that cannot be directly measured are estimated via a disturbance observer.By appropriately choosing the gain matrix,the disturbance observer can approximate the compound disturbance well and the estimate error converges to a compact set.This control strategy is further extended to develop adaptive fuzzy tracking control for MIMO nonlinear systems by coping with practical issues in engineering applications,in particular unknown non-symmetric input saturation and control singularity.Within this setting,the disturbance observer technique is combined with the FLS approximation technique to compensate for the efects of unknown input saturation and control singularity.Lyapunov approach based analysis shows that semi-global uniform boundedness of the closed-loop signals is guaranteed under the proposed tracking control techniques.Numerical simulation results are presented to illustrate the efectiveness of the proposed tracking control schemes. | CHEN Mou CHEN WenHua WU QinXian | 2014 | Science China(Information Sciences)2014，57，1： | 17 |
| 4 | Ecological evolution across the Permian/Triassic boundary at the Kangjiaping Section in Cili County, Hunan Province, China显示文摘The stratigraphic sequence of calcimicrobialite facies at the Permian-Triassic (P/Tr) boundary has well recorded the biotic and environmental transition across the end-Permian catastrophic events. The biostratigraphy, microfacies, carbon isotopes, and fossil records across the P/Tr boundary have been studied at the Kangjiaping Section in Cili County, Hunan Province. Three biostratigraphic zones, Palaeofusulina-Colaniella Zone, Hindeodus parvus Zone, and Isarcicella staeschei Zone, are identified. The excursion of δ13Ccarb exhibits a sharp negative shift in the calcimicrobialite at the P/Tr boundary, which is roughly accordant with the abrupt bioclastic decline. In addition, five types of microfacies are recognized, including algal-foraminifer bioclastic limestone, algal-laminated calcimicrobial limestone, oolitic grainstone, vermiculate limestone, and intraclastic wackstone. The results indicate that the changeover of ecosystem from metazoan reef to calcimicrobialite in Cili is a classic case of marine ecological evolution during the Paleozoic-Mesozoic transition. | WANG QinXian TONG JinNan SONG HaiJun YANG Hao | 2009 | Science China Earth Sciences2009，52，6： | 14 |
| 5 | Silicone oil-based solar-thermal fluids dispersed with PDMS-modified Fe3O4@graphene hybrid nanoparticles显示文摘One of the most challenging problems that limit the practical application of carbon-based photothermal nanofluids is their poor dispersion stability and tendency to form aggregation. Herein, by using Fe_3O_4@graphene hybrid nanoparticles as a model system, we proposed a new method to prepare stably dispersed silicone oilbased solar-thermal nanofluids that can operate at high temperatures than water-based fluids. The introduction of Fe_3O_4 nanoparticles between graphene nanosheets not only physically increases the inter-plane distance of the graphene nanosheet but also provides numerous anchoring points for surface modification. Phosphate-terminated polydimethylsiloxane chains, which have high compatibility with the silicone oil base fluids and hightemperature stability, were synthesized and utilized to modify the Fe_3 O_4 nanoparticle surfaces. The attached chains create steric hindrance and effectively screen the strong inter-plane van der Waals attraction between graphene sheets. Dispersion stability of the nanofluids with different concentrations of surface-modified hybrid nanoparticles and heated under different temperatures was investigated. We have demonstrated that such fluids could maintain stable dispersion under a heating temperature up to 150 °C depending on the concentration of the hybrid nanoparticles. The resultant nanofluids maintained stable dispersion after repeated heating and were employed for consistent direct solar-thermal energy harvesting at 100 °C. | Peng Tao Lei Shu Jingyi Zhang Chiahsun Lee Qinxian Ye Huaixin Guo Tao Deng | 2018 | Progress in Natural Science:Materials International2018，28，5： | 4 |
| 6 | Results of an Intentional Introduction of Artemia sinica in the High-Altitude Tibetan Lake Dangxiong Co:On a Base of Surveys in 2011 and 2013显示文摘1 Introduction The human population is projected to reach 9200million by 2050.A fundamental question for science is whether it is possible to increase food production to meet the demands of a human population of that magnitude.It’s possible only to increase an aquaculture production.Cultivation of fish/shrimp larvae is a bottleneck in a cultivation of the different organisms.Live | JIA Qinxian Elena ANUFRIIEVA LIU Shasha LIU Xifang KONG Fanjing ZHENG Mianping Nickolai SHADRIN | 2014 | Acta Geologica Sinica(English Edition)2014，88，S1： | 2 |
| 7 | Theoretical and experimental specific capacitance of polyaniline in sulfuric acid显示文摘 | Li Hanlu Wang Jixiao Chu Qinxian | 2009 | J Power Sources2009，190，： | 1 |
| 8 | Assessment of spatial distribution and cysts resources of Artemia in late autumn in Dangxiong Co salt lake显示文摘 | Shasha Liu Xifang Liu Qinxian Jia Fanjing Kong Mianping Zheng Guangjun Lv | 2013 | Acta Ecologica Sinica2013，，： | 1 |
| 9 | Comparative study on carbon in surface layer of bottom sediments in different sites of the saline Lake Dagze Co,North-Tibet Plateau,China显示文摘1 Introduction As the global warming issues become increasingly prominent,a research of carbon sinks,which focused on marine and terrestrial ecosystems,are paid more and more attention.Peatlands,soils and ocean floor are | LIU Shasha LIU Xifang JIA Qinxian | 2014 | Acta Geologica Sinica(English Edition)2014，88，S1： | 1 |
| 10 | Assessing the environmental impacts of aircraft noise and emissions显示文摘 | Anuja Mahashabde Philip Wolfe Akshay Ashok Christopher Dorbian Qinxian He Alice Fan Stephen Lukachko Aleksandra Mozdzanowska Christoph Wollersheim Steven R.H. Barrett Maryalice Locke Ian A. Waitz | 2010 | Progress in Aerospace Sciences2010，，1： | 1 |
| 11 | Soil and water conservation functions of seabuckthorn and its role in controlling and exploiting Loess Plateau显示文摘 | Wu Qinxian Zhao Hongyan | 2000 | Forestry Studies in China2000，2，2： | 1 |
| 12 | Significant histological changes are not rare in indeterminate‐phase chronic hepatitis B patients with hepatitis B e antigen‐negative and normal alanine aminotransferase levels显示文摘Background&Objectives:The degree of liver injury in indeterminate chronic hepatitis B(CHB)infection patients with Hepatitis B e antigen(HBeAg)‐negative and persistently normal alanine aminotransferase(PNALT)levels is yet unclear.Therefore,we aimed to assess liver histological changes in such patients by liver biopsy and explore possible predictors.Methods:Overall,711 HBeAg‐negative CHB patients with PNALT levels who underwent liver biopsy from January 2017 to June 2022 were included in this retrospective study.The relationships between histological changes and predictors were assessed by smooth curve fitting and multivariate logistic regression analysis models.Data were also analyzed using American Association for the Study of Liver Disease(AASLD)modified alanine aminotransferase(ALT)criteria.Results:The proportion of significant histological changes in the indeterminate phase was higher than that in the inactive phase(53.97%vs.41.33%).The adjusted odds ratios(aORs)of significant necroinflammation and histological changes for the indeterminate phase were 2.05 and 1.43,respectively,when compared with the inactive phase by multivariate logistic regression analyses.Significant histological changes in the‐phase were positively associated with age,ALT,Aspartate aminotransferase(AST),Hepatitis B surface antigen(HBsAg),and Hepatitis B virus(HBV)DNA levels but negatively correlated with platelet(PLT)levels.HBV DNA≥5 log10 U/L and PLT<200�109/L were independent predictive factors for assessing histological changes in indeterminate‐phase patients.Similar analysis findings were obtained using the two sets of modified ALT criteria.Conclusions:Significant histological changes are not rare in indeterminatephase CHB patients and are higher than in the inactive phase,regardless of the ALT criteria.Histological investigation is strongly suggested for intermediate stage patients with HBV DNA>5 log10 U/L or PLT<200�109/L and antiviral therapy should be considered for such patients. | Deliang Huang Guangde Zhou Jinghan Peng Qinxian Cai Guojun Li Hong Yu Zhibing Zhu Yuanyuan Chen Huiyi Lai Jinyan Jiang Hong Yu Jun Chen | 2023 | iLABMED2023，1，3： | 0 |
| 13 | Lipid Biomarkers and Their Stable Carbon Isotopes in Ancient Seep Carbonates from SW Taiwan, China显示文摘Four massive brecciated, chimney-like, and slender pipe network carbonate samples(JA-4, JA-5, JX-8 and BG-12) were collected from southwestern Taiwan, which were suggested to have formed as a result of anaerobic oxidization of methane(AOM). Considering that the environmental conditions of the carbonates precipitation and the sources of carbon and organic matter need to be further declared, molecular fossils and compound-specific carbon isotopic investigations of the carbonates were conducted in this study. According to lipid biomarkers of 2,6,10,15,19-pentamethyleicosane(PMI) and squalane diagnostic to methanotrophic archaea, as well as the extremely low δ^(13)C values(as low as -1^(13).4‰) detected in samples JA-4, JA-5 and JX-8, these carbonates were revealed to be a result of AOM. Based on the varied δ^(13)C values of characteristic archaea biomarkers in specific samples, biogenic methane was proposed to be responsible for the formation of samples JA-4 and JA-5, whereas a mixed carbon source of ^(13)C-depleted methane and ^(13)C-enriched residual CO_2 from methanogenesis was suggested for the carbonate of JX-8 due to the co-occurrence of a highly positive δ^(13) C_(carb) value(+8‰) and a moderate ^(13)C depletion of PMI. The low content of AOM-related biomarkers and the absence of indicators for ANME-2 suggested that these carbonates were formed in weak seep settings. By comparison, no typical lipid biomarkers for methanotrophic archaea was detected in carbonate BG-12. The short-chain and long-chain n-alkanes accounted for 30% and 45% of all hydrocarbons, respectively, with a CPI value of 1.2, suggesting that the n-alkanes were derived from both marine organisms and terrestrial inputs. A low thermal maturity could be revealed by the incomplete equilibrium value of the C^(31)αβ 22S/(22S+22R) ratio(0.5), and the carbonate BG-12 was probably deposited in a suboxic condition indicated by a value of Pr/Ph ratio(2.5). | GUAN Hongxiang XU Lanfang WANG Qinxian CHEN Duofu WU Nengyou MAO Shengyi | 2019 | Acta Geologica Sinica(English Edition)2019，93，1： | 0 |
| 14 | Some ecological parameters of Artemia parthenogenetica Gahai and their use in resource exploitation显示文摘The effects of temperature on population characteristics of Artemia parthenogenetica Gahai from the Gahai Salt Lake,Qinghai Province,China,were studied in the laboratory at a salinity of 60‰.The major conclusions are as follows:(1)It was found that the adaptive temperature for the development of brine shrimp ranged from 10℃to 39℃.The threshold temperature of development(TD)and the effective accumulative temperature(TA)for hatching were 9.94℃·d and(22.912.08)℃·d,respectively.The TD and TA for the larva were 10.33℃·d and(261.2624.1)℃·d,respectively,and for the whole generation were 10.28℃and(458.6857.60)℃·d,respectively.(2)It showed that the population’s net reproduction rate(R_(o)),the intrinsic rate of natural increase(r_(m)),the mean generation time(T),the finite rate of increase(λ),and the days for population to double(t)of the brine shrimp were determined over temperatures ranging from 19℃to 34℃by analyzing the life table and numerical model.In the temperature range of 14.3℃to 37.3℃for R_(o)>1,the optimum temperature(℃)for R_(o),rm,λ,and t were 25.8℃,29.8℃,30.5℃,and 29.02℃,respectively.The maximum values of R_(o),r_(m) andλwere 54.86 ind.,0.106138/d,and 1.1070/d,respectively.The minimum value of t was 4.73 d.The value of T was in a range of 96.77 to 16.10 d.(3)Based on the 1993-1994 and 1997 data of the water temperature in the Gahai Salt Lake,Qinghai Province,it was estimated that the number of generation of A.parthenogenetica Gahai and the number of the reproductive peak value were 2.670.34 and 4.690.43 in a year,respectively.The peak of nauplii of the first generation was on April 20 to 28.The last whole generation began on August 10.The first reproductive peak was on June 18 to 25.The last reproductive peak was on September 12 to 17.The nauplii that hatched after September 1 cannot complete the development from nauplii to adults because of insufficient habitat effective accumulative temperature.During the period from July 11 to September 20,there was a relatively high productivity of the population.In this case,doubling the population would take less than 30 d,and the intrinsic rate of natural increase was over 0.02/d.Therefore,the value of resource exploitation would be maximal during that period annually. | Qinxian JIA Hongping WANG Fanjing KONG Mianping ZHEN | 2009 | Frontiers in Biology2009，4，3： | 0 |
| 15 | Construction of Tissue Plasminogen Activator (t-PA) of Eukaryotic Expressing Vector^伙显示文摘 | Xiaoyan Zhu Fulian Gao Yi Ding Qinxian Zhang | 2005 | Journal of US-China Medical Science2005，2，4： | 0 |
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