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| 1 | Land Use Changes in Northeast China Driven by Human Activities and Climatic Variation显示文摘Human-induced land use/cover change (LUCC) forms an important component of global environmental change. Therefore, it is important to study land use/cover and its change at local, regional and global scales. In this paper we conducted the study of land use change in Northeast China, one of the most important agricultural zones of the nation. From 1986 to 2000, according to the study results obtained from Landsat images, widespread changes in land use/cover took place in the study area. Grassland, marsh, water body and woodland decreased by 9864, 3973, 1367 and 10,052km2, respectively. By comparison, paddy field, dry farmland, and built-up land expanded by 7339, 17193 and 700km2, respectively. Those changes bore an interactive relationship with the environment, especially climate change. On the one hand, climate warming created a potential environment for grassland and marsh to be changed to farmland as more crops could thrive in the warmer climate, and for dry farmland to paddy field. On the other hand, the changed surface cover modified the local climate. Those changes, in turn, have adversely influenced the local environment by accelerating land degradation. In terms of socio-economic driving forces, population augment, regional economic development, and national and provincial policies were confirmed as main driving factors for land use change. | WANG Zongming LIU Zhiming SONG Kaishan ZHANG Bai ZHANG Sumei LIU Dianwei REN Chunying YANG Fei | 2009 | Chinese Geographical Science2009，19，3： | 10 |
| 2 | Natural gas geochemistry and its origins in Kuqa depression显示文摘According to gas compositional and carbon isotopic measurement of 114 gas samples from the Kuqa depression,accumulation of the natural gases in the depression is dominated by hydrocarbon gases, with high gas dryness(C1/C1-4)at the middle and northern parts of the depression and low one towards east and west sides and southern part.The carbon isotopes of methane and its homologues are relatively enriched in 13 C,and the distributive range ofδ13C 1 ,δ13C 2 andδ13C 3 is-32‰―-36‰,-22‰―-24‰and-20‰―-22‰,respectively.In general,the carbon isotopes of gaseous alkanes become less negative with the increase of carbon numbers.Theδ13C CO2 value is less than-10‰in the Kuqa depression,indicating its organogenic origin.The distributive range of 3 He/ 4 He ratio is within n×10-8 and a decrease in 3 He/ 4 He ratio from north to south in the depression is observed.Based on the geochemical parameters of natural gas above,natural gas in the Kuqa depression is of characteristics of coal-type gas origin.The possible reasons for the partial reversal of stable carbon isotopes of gaseous alkanes involve the mixing of gases from one common source rock with different thermal maturity or from two separated source rock intervals of similar kerogen type,multistages accumulation of natural gas under high-temperature and over-pressure conditions,and sufficiency and diffusion of natural gas. | LIU QuanYou 1 ,QIN ShengFei 1 ,LI Jian 2 ,LIU WenHui 3 ,ZHANG DianWei 3 ,ZHOU QingHua 1 &HU AnPing 1 1 Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China 2 Langfang Branch of Research Institute of Petroleum Exploration and Development,PetroChina,Langfang 065007,China 3 Exploration and Production Research Institute,SINOPEC,Beijing 100083,China | 2008 | Science China Earth Sciences2008，51，S1： | 9 |
| 3 | Land Use/Cover Changes and Environmental Consequences in Songnen Plain,Northeast China显示文摘The Songnen Plain in Northeast China,one of the key national bases of agricultural production,went through remarkable land use/cover changes in recent years.This study aimed to explore the long-term land use/cover changes and the effects of these changes on the environment.The Landsat-based analysis showed that,during 1986-2000,cropland,built-up land and barren land had increased,among which cropland had the largest increase of 9,198km2 with an increase rate of 7.5%.Woodland,grassland,water body and swampland had decreased correspondingly,among which grassland had the most dramatic decrease of 6,127km2 with a decrease rate of 25.6%.The transition matrix results revealed that grassland,woodland and swampland were the three main land use types converted to cropland.Climate warming created the potential environment for the conversion of grassland and swampland into cropland.Land resources policy made by central and provincial governments of China affected the pattern and intensity of land use.Land use/cover changes accompanied by climatic variation brought out a series of environmental consequences,such as sand desertification of land,land salinization and alkalinization,grassland degradation,and more frequent floods.Under this circumstance,optimized land use structure and restoration measures are needed. | LIU Dianwei WANG Zongming SONG Kaishan ZHANG Bai HU Liangjun HUANG Ni ZHANG Sumei LUO Ling ZHANG Chunhua JIANG Guangjia | 2009 | Chinese Geographical Science2009，19，4： | 8 |
| 4 | Upgrading a regional groundwater level monitoring network for Beijing Plain,China显示文摘地区性的地下水层次监视为确定提供重要信息环境上的地下水弄空和估计的影响。历史上,在北京平原的地下水水平监视井,中国,为估计地下水资源并且为监视消沉的锥被安装。监视井在井地和城市的区域附近被聚类。有迫切需要升级存在监视井到监视网络为综合的水资源管理获得信息的地区性的地下水水平。一个新方法为设计监视网络的地区性的地下水水平被建议。方法基于地下水政体地区印射。地下水政体地区地图描出可能的不同地下水的不同区域铺平变化并且为定位监视井的地下水是有用的。这个方法被用于平凡的北京升级监视网络的地区性的地下水水平。 | Yangxiao Zhou Dianwei Dong Jiurong Liu Wenpeng Li | 2013 | Geoscience Frontiers2013，4，1： | 8 |
| 5 | Adaptive Robust Filtering Algorithm for BDS Medium and Long Baseline Three Carrier Ambiguity Resolution显示文摘For classical TCAR(three carrier ambiguity resolution)algorithm is affected by ionospheric delay and measurement noise,it is difficult to reliably fix ambiguity at medium and long baselines.An improved TCAR algorithm which takes the influence of ionospheric delay into account and has good adaptive robustness is proposed.On the basis of the non-geometric TCAR model,ionospheric delay is obtained by linearly combining extra-wide-lane with fixed ambiguity,and then wide-lane ambiguity is solved.Solving narrow-lane ambiguity by adaptive robust filtering by constructing optimal combination observation,which can effectively improve the fixed success rate of narrow-lane ambiguity and reduce the adverse effects of gross error.Experimental results show that the improved TCAR algorithm can guarantee a high fixed correct rate of wide-lane ambiguity,effectively improve fixed success rate of narrow-lane ambiguity,and has a good ability to resist gross error. | Yangjun GAO Zhiwei LV Pengjin ZHOU Zhengyang JIA Lundong ZHANG Dianwei CONG | 2020 | Journal of Geodesy and Geoinformation Science2020，3，2： | 5 |
| 6 | Neural-Network-Based Terminal Sliding Mode Control for Frequency Stabilization of Renewable Power Systems显示文摘This paper addresses a terminal sliding mode control(T-SMC) method for load frequency control(LFC) in renewable power systems with generation rate constraints(GRC).A two-area interconnected power system with wind turbines is taken into account for simulation studies. The terminal sliding mode controllers are assigned in each area to achieve the LFC goal. The increasing complexity of the nonlinear power system aggravates the effects of system uncertainties. Radial basis function neural networks(RBF NNs) are designed to approximate the entire uncertainties. The terminal sliding mode controllers and the RBF NNs work in parallel to solve the LFC problem for the renewable power system. Some simulation results illustrate the feasibility and validity of the presented scheme. | Dianwei Qian Guoliang Fan | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，3： | 5 |
| 7 | Suppression of Chaotic Behaviors in a Complex Biological System by Disturbance Observer-based Derivative-Integral Terminal Sliding Mode显示文摘Coronary artery systems are a kind of complex biological systems. Their chaotic phenomena can lead to serious health problems and illness development. From the perspective of engineering, this paper investigates the chaos suppression problem. At first, nonlinear dynamics of coronary artery systems are presented. To suppress the chaotic phenomena, the method of derivative-integral terminal sliding mode control is adopted. Since coronary artery systems suffer from uncertainties, the technique of disturbance observer is taken into consideration. The stability of such a control system that integrates the derivative-integral terminal sliding mode controller and the disturbance observer is proven in the sense of Lyapunov. To verify the feasibility and effectiveness of the proposed strategy, simulation results are illustrated in comparison with a benchmark. | Dianwei Qian Hui Ding SukGyu Lee Hyansu Bae | 2020 | IEEE/CAA Journal of Automatica Sinica2020，7，1： | 4 |
| 8 | Evapotranspiration Estimation Based on MODIS Products and Surface Energy Balance Algorithms for Land(SEBAL) Model in Sanjiang Plain,Northeast China显示文摘In this study,the Surface Energy Balance Algorithms for Land(SEBAL) model and Moderate Resolution Imaging Spectroradiometer(MODIS) products from Terra satellite were combined with meteorological data to estimate evapotranspiration(ET) over the Sanjiang Plain,Northeast China.Land cover/land use was classified by using a recursive partitioning and regression tree with MODIS Normalized Difference Vegetation Index(NDVI) time series data,which were reconstructed based on the Savitzky-Golay filtering approach.The MODIS product Quality Assessment Science Data Sets(QA-SDS) was analyzed and all scenes with valid data covering more than 75% of the Sanjiang Plain were selected for the SEBAL modeling.This provided 12 overpasses during 184-day growing season from May 1st to October 31st,2006.Daily ET estimated by the SEBAL model was misestimaed at the range of-11.29% to 27.57% compared with that measured by Eddy Covariance system(10.52% on average).The validation results show that seasonal ET from the SEBAL model is comparable to that from ground observation within 8.86% of deviation.Our results reveal that the time series daily ET of different land cover/use increases from vegetation on-going until June or July and then decreases as vegetation senesced.Seasonal ET is lower in dry farmland(average(Ave):491 mm) and paddy field(Ave:522 mm) and increases in wetlands to more than 586 mm.As expected,higher seasonal ET values are observed for the Xingkai Lake in the southeastern part of the Sanjiang Plain(Ave:823 mm),broadleaf forest(Ave:666 mm) and mixed wood(Ave:622 mm) in the southern/western Sanjiang Plain.The ET estimation with SEBAL using MODIS products can provide decision support for operational water management issues. | DU Jia SONG Kaishan WANG Zongming ZHANG Bai LIU Dianwei | 2013 | Chinese Geographical Science2013，23，1： | 4 |
| 9 | An isotope study of the accumulation mechanisms of high-sulfur gas from the Sichuan Basin, southwestern China显示文摘The mechanism of hydrogen sulfide(H_2S) generation plays a key role in the exploration and development of marine high-sulfur natural gas, of which the major targets are the composition and isotope characteristics of sulfur-containing compounds.Hydrocarbon source rocks, reservoir rocks, natural gases and water-soluble gases from Sichuan Basin have been analyzed with an online method for the content of H_2S and isotopic composition of different sulfur-containing compounds. The results of comparative analysis show that the sulfur-containing compounds in the source rocks are mainly formed by bacterial sulfate reduction(BSR), and the sulfur compounds in natural gas, water and reservoir are mainly formed by thermal sulfate reduction(TSR). Moreover, it has been shown that the isotopically reversion for methane and ethane in high sulfur content gas is caused by TSR. The sulfur isotopic composition of H_2S in natural gas is inherited from the gypsum or brine of the same or adjacent layer,indicating that the generation and accumulation of H_2S have the characteristics of either a self-generated source or a near-source. | LIU WenHui Tenger ZHANG ZhongNing LUO HouYong ZHANG DianWei WANG Jie LI LiWu GAO Bo LU LongFei ZHAO Heng | 2016 | Science China Earth Sciences2016，59，11： | 2 |
| 10 | Using geochemical tracing system to identify new types of gas sources in marine strata of the Hotan River Gas Field in the Tarim Basin显示文摘There are natural gas sources of various modes of occurrence in superimposed basins. Besides the conventional kerogen and ancient oil reservoir, dispersed soluble organic matter (DSOM) is an important direct gas source. Because of its wide distribution, great potential to generate gas and proneness to crack under catalysis, DSOM is an important type of gas source in the highly evolved zones in marine strata. Through the geological and geochemical analysis that reflects the long-period evolvement and multiple gas accumulation processes in marine strata, and using the ternary geochemical tracing system, here we study the origin and accumulation of the natural gas in the Hotan River Gas Field in the Tarim Basin. The natural gas is produced from highly evolved and cracked DSOM in the Hotan River Gas Field, and it is accumulated after migrating for a long distance along faults. This conclusion is of great significance to the further expansion of the oil and gas exploration fields in the Tarim Basin. | WenHui Liu DianWei Zhang Bo Gao Ming Fan | 2010 | Science China Earth Sciences2010，53，6： | 2 |
| 11 | Reaction dynamics in the combustion synthesis system of Al-CrO_3-Al_2O_3-NaF-N_2-O_2显示文摘A new material with heat-resistant and adiabatic characteristics and high strength was prepared using the combustion syn- thesis method by mixed powders of CrO3, Al, Al2O3, and NaF in atmospheric gas. The reaction dynamic process of the Al-CrO3-NaF-Al2O3-N2-O2 new material system by the combustion synthesis method was discussed based on the observation results by SEM, EDS, and XRD in combination with the combustion front quenching method (CFQM) and the relation curves between re- action free enthalpies and the corresponding temperatures. The combustion synthesis mechanism and the formation reasons of the phase in the combustion product were analyzed. | Dazheng Yang Yue Zhang Degang Li Dianwei Qi Wei Deng Dayong Xun | 2007 | Journal of University of Science and Technology Beijing2007，14，3： | 2 |
| 12 | Robust Formation Maneuvers Through Sliding Mode for Multi-agent Systems With Uncertainties显示文摘This paper develops a robust control method for formation maneuvers of a multi-agent system. The multi-agent system is leader-follower-based, where the graph theory is utilized to describe the information exchange among the agents. The control method is exercised via sliding mode methodology where each agent is subjected to uncertainties. The technique of nonlinear disturbance observer is adopted in order to overcome the adverse effects of the uncertainties. Assuming that the uncertainties have an unknown bound, the formation stability conditions are investigated according to a given communication topology. In the sense of Lyapunov, not only the formation maneuvers of the multi-agent system have guaranteed stability, but the desired formations of the agents are also realized. Compared with other two control approaches, i.e., the basic sliding mode approach and the fuzzy sliding mode approach, some numerical results are presented to illustrate the effectiveness, performance and validity of the robust control method for formation maneuvers in the presence of uncertainties. | Dianwei Qian Chengdong Li Suk Gyu Lee Chao Ma | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，1： | 2 |
| 13 | Activity of Silica-Rich Hydrothermal Fluid and Its Impact on Deep Dolomite Reservoirs in the Sichuan Basin, Southern China显示文摘Well-developed dissolution pores occur in the dolomites of the Sinian Dengying Formation, which is an important oil and gas reservoir layer in the Sichuan Basin and adjacent areas in southern China. The pores are often filled with quartz, and some dolomites have been metasomatically altered to siliceous chert. Few studies have documented the characteristics, source or origin of silica-rich fluids and their effects on the dolomite reservoir. The peak homogenisation temperatures(T_h) of fluid inclusions in pore-filling quartz are between 150℃ and 190℃, with an average of 173.7℃. Gases in the inclusions are mainly composed of CO_2, CH_4 and N_2. Compared with host dolomite, pore-filling quartz and metasomatic chert contain higher amounts of Cr, Co, Mo, W and Fe, with average concentrations of 461.58, 3.99, 5.05, 31.43 and 6666.83 ppm in quartz and 308.98, 0.99, 1.04, 13.81 and 4703.50 ppm in chert, respectively. Strontium levels are lower than that in the host dolomite, with average concentrations in quartz and chert of 4.81 and 11.06 ppm, respectively. Rare earth element compositions in quartz and chert display positive Eu anomalies with a maximum δEu of 5.72. The δD_(SMOW) values of hydrogen isotopes in water from quartz inclusions vary from-85.1‰ to-53.1‰ with an average of-64.3‰, whereas the δ^(18)O_(SMOW) values range from 7.2‰ to 8.5‰ with an average of 8.2‰. The average ^(87)Sr/^(86)Sr ratios in quartz and chert are 0.711586 and 0.709917, respectively, which are higher than that in the host dolomite. The fluid inclusions, elemental and isotopic compositions demonstrate that the formation of quartz and chert was related to silica-rich hydrothermal fluid and that the fluid was the deep circulation of meteoric water along basement faults. Interactions with silica-rich hydrothermal fluids resulted in densification of dolomite reservoirs in the Dengying Formation through quartz precipitation and siliceous metasomatism. However, it increased the resistance of the host dolomite to compaction, improving the ability to maintain reservoir spaces during deep burial. Evidence for silica-rich hydrothermal activity is common in the Yangtze Platform and Tarim Basin and its influence on deep dolomite reservoirs should be thoroughly considered. | ZHU Dongya ZHANG Dianwei LIU Quanyou JIN Zhijun HE Zhiliang | 2017 | Acta Geologica Sinica(English Edition)2017，91，6： | 2 |
| 14 | Significance of gypsum-salt rock series for marine hydrocarbon accumulation显示文摘With further exploration and research,the gypsum-salts rock series as good caprocks attracted a lot of attention.The gypsum-salt rock series played an important role during migration,preservation and trapping of hydrocarbons.Recently,major breakthroughs have been continuously made in marine petroleum exploration of gypsum-salt rock series in the eastern Ordos Basin,the central Tarim Basin and the western Sichuan Basin in China,and the high-evolution and low-abundance gypsum-salt rock series as hydrocarbon source rocks become possible.Besides research advances in the reservoirecaprock assemblage of gypsum-salt rock series,development and hydrocarbon-generation potential of source rocks in the gypsum-salt rock series were well studied in terms of source-rock development environment and hydrocarbon generation mechanism.Results showed that the gypsum-salt rock series,including high-evolution and low-TOC gypsum-salt rock series in China,could be regarded as good source rocks.This understanding was a breakthrough to previous traditional viewpoint that low-TOC gypsum-salt rock series could not act as effective hydrocarbon sources.The key to understand hydrocarbon-generation mechanism was that abundant and high-quality hydrocarbon-generation materials,large amount of hydrocarbon generation and conversion in geological history,and hydrocarbongeneration materials occurred in the form of carboxylates,were developed in the high-evolution and low-TOC gypsum-salt rock series. | Wenhui Liu Heng Zhao Quanyou Liu Bing Zhou Dianwei Zhang Jie Wang Longfei Lu Houyong Luo Qingqiang Meng Xiaoqi Wu | 2017 | Petroleum Research2017，2，3： | 2 |
| 15 | Retrieval of Total Suspended Matters Using Field Spectral Data in Shitoukoumen Reservoir,Jilin Province,Northeast China显示文摘From August to October in 2006,three times of field spectral measurements with a Field Spec FR spectroradiometer(Analytical Spectral Devices,Inc.,USA) were carried out in Shitoukoumen Reservoir,Jilin Province,Northeast China. Owing to the serious soil and water loss in the upstream,reflectance curves of the reservoir were characterized by high concentrations of total suspended matter(TSM) . Extending the spectral analysis to 1200nm in the near-infrared band,this research revealed an obvious reflectance peak around 1070nm which was caused by the strong backscattering of high TSM. The method of partial least squares(PLS) regression was applied to retrieving the TSM. Reflectance in two spectral bands,i.e.,675-948nm and 1029-1105nm,were used as variables to develop PLS models. Traditional linear regression,first derivative model and logarithmic model were also used for the comparison of different models. Results showed that the PLS model based on Rrs(675) -Rrs(948) gave out best results with high precision and stability. Although the PLS model based on Rrs(1029) -Rrs(1105) did not have an outstanding performance due to lots of noise,the reflectance peak in the near-infrared band was an important TSM feature and its efficient exploitation would have a considerable significance in TSM remote sensing. | XU Jingping ZHANG Bai LI Fang SONG Kaishan WANG Zongming LIU Dianwei ZHANG Guangxin | 2009 | Chinese Geographical Science2009，19，1： | 2 |
| 16 | SPOT5 multi-spectral (MS) and panchromatic (PAN) image fusion using an improved wavelet method based on local algorithm 显示文摘 | Dong Zhangyu Wang Zongming Liu Dianwei | 2013 | Computers -Geosciences2013，60，： | 1 |
| 17 | Characterization of Water Constituents Spectra Absorption in Chagan Lake of Jilin Province, Northeast China显示文摘Research on the optical characteristics of water color constituents in Chagan Lake of Jilin Province,Northeast China was carried out in order to investigate the variability of the spectra absorption parameters as inputs to bio-optical models and remote sensing algorithms for converting observed spectral signals into water quality information.Samples of total particulates,non-algal particles and colored dissolved organic matter (CDOM) were first prepared by quantitative filter technique (QFT) and then absorption coefficients of these color producing agents were determined by spectrophotometry.Spectral characteristics of absorption coefficients by total particulate matter,spectral specific absorption dependency on chlorophyll concentration (Chl-a) of phytoplankton,spectral absorption slopes variation for CDOM and non-algal particles and their corresponding reasons were examined and clarified over five months of 2009 and 2010 in this study.Results suggest that total particulate spectral absorption in Chagan Lake is mainly dominated by non-algal particles in most cases,but phytoplankton could be the dominant contributor when chlorophyll concentration is high (up to 84.48 mg/m3 in autumn 2010).The specific absorption coefficients of phytoplankton particulate (a*ph(λ)) dependency on Chl-a is significantly variable due to relative contributions of package effect and accessory pigments,and the parameters of power function are clearly biased on a long time span.The sources of variability in spectral absorption slopes of CDOM and non-algal particles are mainly attributed to the changing proportions of high molecular weight humic acids and mineral suspended sediments in waters,respectively. | WANG Yuandong LIU Dianwei SONG Kaishan DU Jia WANG Zongming ZHANG Bai TANG Xuguang LEI Xiaochun WU Yanqing | 2011 | Chinese Geographical Science2011，21，3： | 1 |
| 18 | Remote determination of chromophoric dissolved organic matter in lakes, China显示文摘Chromophoric dissolved organic matter(CDOM)strongly influences the water-leaving radiance from aquatic ecosystems.In most inland waters,the remote determination of CDOM absorption presents a central challenge due to their complex optical conditions.However,identifying the temporal and spatial variability of CDOM is fundamental to the understanding of aquatic biogeo-chemical dynamics.In the present study,semi-analytical and empirical modeling approaches were used to examine CDOM absorption in four,shallow,inland water bodies using the spectral bands and sensitivities of major satellite observational systems.Of the models examined,an empirical multiband model was found to provide the highest correlation with measured CDOM absorption.The spectral characteristics of the MERIS sensors yielded the best results with respect to the other available satellite sensors.High detrital load was observed to be a major impediment to estimating CDOM absorption,while lakes with elevated phytoplankton biomass did not present similar problems. | Guangjia Jiang Ronghua Ma Hongtao Duan Steven A.Loiselle Jingping Xu Dianwei Liu | 2014 | International Journal of Digital Earth2014，7，11： | 1 |
| 19 | Remote estimation of chlorophyll-a in turbid inland waters: Three-band model versus GA-PLS model显示文摘 | Kaishan Song Lin Li L.P. Tedesco Shuai Li Hongtao Duan Dianwei Liu B.E. Hall Jia Du Zuchuan Li Kun Shi Ying Zhao | 2013 | Remote Sensing of Environment2013，，： | 1 |
| 20 | SPOT5 multi-spectral(MS) and panchromatic (PAN) image fusion using an improved wavelet method based on local algorithm 显示文摘 | Dong Zhangyu Wang Zongming Liu Dianwei | 2013 | Computers & Geosciences2013，，60： | 1 |
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