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| 1 | The oasis expansion and eco-environment change over the last 50 years in Manas River Valley, Xinjiang显示文摘The oasis expansion and economic development of the Manas River Valley is one of the most successful examples in Xinjiang. In this paper, the oasis spatial distribution pattern and dynamic change were examined using imageries of Landsat MSS, TM and ETM, land use and topographic maps in six different periods (such as 1949, 1962, 1976, 1989, 1999 and 2001) over the last 50 years in the valley. The oasis expansion process could be divided into two stages according to the annual rate of oasis area increase, the fast oasization stage (from 1949 to 1976) when the oasis area ex-panded from 156.385 km2 in 1949 to 3,639.491 km2 in 1976 because of rapidly increased population and quickly enlarged farmland area; and the urbanization stage (from 1976 to 2001) when the ex-pansion ratio of farmland slowed down, and the urbanization process quickened, the total oasis area reached 5042.440 km2 in 2001. With the continuous expansion of oasis and farmland, a large quantity of river water was drawn into irrigation ditch and plain lakes, so only a small quantity of river water could flow into lakes, as a result, the Manas Lake dried up, salization and basification problems happened in the low-lying oasis region. The natural swamp around the lake was shrunk greatly and biodiversity decreased significantly. The driving force analysis reveals that human activities, such as reclamation and population growth, played a major role in the oasis expansion and ecological dete-rioration in the Manas River Valley. So further efforts should be made to improve the efficiency of water resource utility and adjust layout of the regional agricultural and animal husbandry to keep the sustainable development of oasis economic belt of the northern slope of Tianshan Mts. | CHENG Weiming ZHOU Chenghu LIU Haijiang ZHANG Yang JIANG Yan ZHANG Yichi YAO Yonghui | 2006 | Science China Earth Sciences2006，49，2： | 24 |
| 2 | Cavitation characteristics of pit structure in ultrasonic field显示文摘Bubble collecting, bubble holding and micro-bubble ejecting characteristics of pit structure and the influence of cavitation bubble on the development of erosion pit are investigated by means of highspeed photography experiments. Pits tend to collect and hold wandering cavitation bubbles. The air holding phenomenon of pits can be a destination of the incubation period in the process of cavitation erosion. The holding bubble tends to eject micro-bubbles from the top of holding cavitation bubble, making the pit a source of nuclei. With bubbles being held in pits, the diameters of pits increase rapidly. But in the given experiment condition, there is a specific stable value beyond which the diameter of pits will not increase. This characteristic will be helpful in understanding and predicting the cavitation erosion process. | BAI LiXin XU WeiLin ZHANG FaXing LI NaiWen ZHANG YiChi HUANG DeFa | 2009 | Science China(Technological Sciences)2009，52，7： | 11 |
| 3 | Vegetation dynamics induced by groundwater fluctuations in the lower Heihe River Basin,northwestern China显示文摘Aims Since 2000,the environmental flow controls project has been implemented in the lower Heihe River Basin,a typical arid inland river basin in northwest China,to restore the deteriorated ecological environment in this region.The aim of this study was to explore the impacts of groundwater fluctuations on vegetation dynamics.Our results can be used as a reference for water resources planning and management to maintain proper environmental flows in arid areas.Methods The location(by Global Positioning System)and depth of the monitoring wells,as well as groundwater table depth and salinity were measured in situ at each site from July to August 2009.Based on the measurements of the groundwater table depth and salinity following the implementation of environmental flow controls project(EFCP)in the lower Heihe River Basin,the groundwater fluctuations during the period from 2001 to 2009 were analyzed.Descriptive statistics and Pearson’s correlation were used to analyze the relationship between vegetation changes and groundwater table fluctuations.Additionally,the spatial distributions of the groundwater table depth and salinity were interpolated using the simple kriging method.Trend analysis was applied to the time series of integrated Moderate Resolution Imaging Spectroradiometer normalized difference vegetation index data to identify interannual vegetation dynamics.The relationship between vegetation status and groundwater environment was investigated at different spatial scales by analyzing and comparing the time series and trends.Important Findings(i)The groundwater table and salinity increased significantly in most of the study area with spatial heterogeneity.On average,the groundwater table rose;0.5 and 1.5 m in the upper and lower Ejina Basin,respectively,and the groundwater salinity increased across the study area by 0–4%.(ii)A notable correlation between the vegetation status and the groundwater table was revealed when the groundwater table depth fluctuated between 1.8 and 3.5 m,whereas the vegetation did not show an obvious response to groundwater table changes when the groundwater table depth was more than 5–6 m.(iii)Vegetation restoration mainly occurred in riparian areas within 500–1000 m of from natural rivers,where the groundwater table depth varied from 2 to 4 m,and salinity was<5%,whereas vegetation degradation appeared at some locations where groundwater environment had deteriorated. | Ping Wang Yichi Zhang Jingjie Yu Guobin Fu Fei Ao | 2011 | Journal of Plant Ecology2011，4，1： | 10 |
| 4 | Recent Progress in Fiber-Optic Hydrophones显示文摘Fiber-optic hydrophone (FOH) is a significant type of acoustic sensor, which can be used in both military and civilian fields such as underwater target detection, oil and natural gas prospecting, and earthquake inspection. The recent progress of FOH is introduced from five aspects, including large-scale FOH array, very-low-frequency detection, fiber-optic vector hydrophone (FOVH), towed linear array, and deep-sea and long-haul transmission. The above five aspects indicate the future development trends in the FOH research field, and they also provide a guideline for the practical applications of FOH as well as its array. | Zhou MENG Wei CHEN Jianfei WANG Xiaoyang HU Mo CHEN Yichi ZHANG | 2021 | Photonic Sensors2021，11，1： | 6 |
| 5 | Liver Med23 ablation improves glucose and lipid metabolism through modulating FOX01 activity显示文摘 | Yajing Chu Leonardo Gomez Rosso Ping Huang Zhichao Wang Yichi Xu Xiao Yao Menghan Bao Jun Yan Haiyun Song Gang Wang | 2014 | Cell Research2014，24，10： | 5 |
| 6 | Validation of a HRGC–ECNI/LRMS method to monitor short-chain chlorinated paraffins in human plasma显示文摘Short-chain chlorinated paraffins(SCCPs) are produced in high volume and have the high potential to pose a threat to human health. However, little information is available for SCCP contamination in human blood/plasma/serum, mainly due to the difficulty of sample preparation and quantitative analysis. A method using high resolution gas chromatography coupled with electron capture negative ionization low resolution mass spectrometry(HRGC–ECNI/LRMS) was developed and validated to measure SCCPs in human plasma. The pretreatment process included protein denaturation and lipid elimination, liquid–liquid extraction with a mixture of n-hexane/dichloromethane(1:1, V/V), and cleanup on a multilayer silica column. The blank controls, including procedural blank, vacuum blood collection tube blank, and instrumental blank, were the most pivotal points for the reliable analysis of SCCPs. The average value of procedural blanks was 9.0 ng/g; and the method detection limit(MDL), calculated as the sum of the average procedural blank value and 3 times of the standard deviation of the procedural blanks, was 12.6 ng/g plasma. The validated method was applied to measure the concentrations of the total SCCPs(∑ SCCPs) in50 plasma samples from a general population. The measured plasma concentrations of ∑SCCPs ranged from | Jiazhi Xu Weijing Guo Linhuan Wei Yuan Gao Haijun Zhang Yichi Zhang Ming Sun Jiping Chen | 2019 | Journal of Environmental Sciences2019，31，1： | 5 |
| 7 | The effect of environmental factors on spatial variability in land use change in the high-sediment region of China's Loess Plateau显示文摘In areas with topographic heterogeneity, land use change is spatially variable and influenced by climate, soil properties, and topography. To better understand this variability in the high-sediment region of the Loess Plateau in which soil loss is most severe and sediment diameter is larger than in other regions of the plateau, this study builds some indicators to identify the characteristics of land use change and then analyze the spatial variability as it is affected by climate, soil property, and topography. We build two indicators, a land use change intensity index and a vegetation change index, to characterize the intensity of land use change, and the degree of vegetation restoration, respectively. Based on a subsection mean method, the two indicators are then used to assess the spatial variability of land use change affected by climatic, edaphic, and topographic elements. The results indicate that: 1) Land use changed significantly in the period 1998–2010. The total area experiencing land use change was 42,302 km2, accounting for 22.57%of the study area. High-coverage grassland, other woodland, and forest increased significantly, while low-coverage grassland and farmland decreased in 2010 compared with 1998. 2) Land use change occurred primarily west of the Yellow River, between 35 and 38 degrees north latitude. The four transformation types, including(a) low-coverage grassland to medium-coverage grassland,(b) medium-coverage grassland to high-coverage grassland,(c) farmland to other woodland, and(d) farmland to medium-coverage grassland, were the primary types of land use change, together constituting 60% of the area experiencing land use change. 3) The spatial variability of land use change was significantly affected by properties of dryness/wetness, soil conditions and slope gradient. In general, land use changed dramatically in semi-arid regions, remained relativelystable in arid regions, changed significantly in clay-rich soil, remained relatively stable in clay-poor soil, changed dramatically in steeper slopes, and remained relatively stable in tablelands and low-lying regions. The increase in vegetation coincided with increasing changes in land use for each physical element. These findings allow for an evaluation of the effect of the Grain to Green Program, and are applicable to the design of soil and water conservation projects on the Loess Plateau of China. | LUO Ya YANG Shengtian ZHAO Changsen LIU Xiaoyan LIU Changming WU Linna ZHAQ Haigen ZHANG Yichi | 2014 | Journal of Geographical Sciences2014，24，5： | 5 |
| 8 | Practical high-performance lead-free piezoelectrics:structural flexibility beyond utilizing multiphase coexistence显示文摘Due to growing concern for the environment and human health, searching for high-performance lead-free piezoceramics has been a hot topic of scientific and industrial research. Despite the significant progress achieved toward enhancing piezoelectricity, further efforts should be devoted to the synergistic improvement of piezoelectricity and its thermal stability. This study provides new insight into these topics.A new KNN-based lead-free ceramic material is presented, which features a large piezoelectric coefficient(d33) exceeding 500 pC/N and a high Curie temperature(Tc) of ~200℃. The superior piezoelectric response strongly relies on the increased composition-induced structural flexibility due to lattice softening and decreased unit cell distortion. In contrast to piezoelectricity anomalies induced via polymorphic transition, this piezoelectricity enhancement is effective within a broad temperature range rather than a specific small range. In particular, a hierarchical domain architecture composed of nano-sized domains along the submicron domains was detected in this material system, which further contributes to the high piezoelectricity. | Qing Liu Yichi Zhang Jing Gao Zhen Zhou Dong Yang Kai-Yang Lee Andrew Studer Manuel Hinterstein Ke Wang Xiaowen Zhang Longtu Li Jing-Feng Li | 2020 | National Science Review2020，7，2： | 5 |
| 9 | Characterization of mechanical properties of aluminum cast alloy at elevated temperature显示文摘The tensile response, the low cycle fatigue(LCF) resistance, and the creep behavior of an aluminum(Al) cast alloy are studied at ambient and elevated temperatures.A non-contact real-time optical extensometer based on the digital image correlation(DIC)is developed to achieve strain measurements without damage to the specimen. The optical extensometer is validated and used to monitor dynamic strains during the mechanical experiments. Results show that Young's modulus of the cast alloy decreases with the increasing temperature, and the percentage elongation to fracture at 100℃ is the lowest over the temperature range evaluated from 25℃ to 300℃. In the LCF test, the fatigue strength coefficient decreases, whereas the fatigue strength exponent increases with the rising temperature. The fatigue ductility coefficient and exponent reach maximum values at 100℃. As expected, the resistance to creep decreases with the increasing temperature and changes from 200℃ to 300℃. | Shuiqiang ZHANG Yichi ZHANG Ming CHEN Yanjun WANG Quan CUI Rong WU D.AROLA Dongsheng ZHANG | 2018 | Applied Mathematics and Mechanics(English Edition)2018，39，7： | 4 |
| 10 | Effects of grain size on the corrosion resistance of pure magnesium by cooling rate-controlled solidification显示文摘 | Yichi LIU Debao LIU then YOU Minfang CHEN | 2015 | Frontiers of Materials Science2015，9，3： | 3 |
| 11 | Effects of solidification cooling rate on the corrosion resistance of Mg–Zn–Ca alloy显示文摘This study was carried out to investigate the effect of solidification cooling rate on the corrosion resistance of an Mg–Zn–Ca alloy developed for biomedical applications. A wedge shaped copper mould was used to obtain different solidification cooling rates. Electrochemical and immersion tests were employed to measure the corrosion resistance of Mg–Zn–Ca alloy. It was found that increasing cooling rate resulted in a significant improvement in the corrosion resistance of the Mg–Zn–Ca alloy. The findings were explained in terms of solidification behaviour in association with the change in solubility of the alloying elements, microstructural homogeneity and refinement and chemical homogeneity as well as the increased cooling rates. | Debao Liu Yichi Liu Yan Huang Rong Song Minfang Chen | 2014 | Progress in Natural Science:Materials International2014，24，5： | 3 |
| 12 | A distributed VSG control method for a battery energy storage system with a cascaded H-bridge in a grid-connected mode显示文摘With the high penetration of renewable energy,new challenges,such as power fluctuation suppression and inertial support capability,have arisen in the power sector.Battery energy storage systems play an essential role in renewable energy integration.In this paper,a distributed virtual synchronous generator(VSG)control method for a battery energy storage system(BESS)with a cascaded H-bridge converter in a grid-connected mode is proposed.The VSG is developed without communication dependence,and state-of-charge(SOC)balancing control is achieved using the distributed average algorithm.Owing to the low varying speed of SOC,the bandwidth of the distributed communication networks is extremely slow,which decreases the cost.Therefore,the proposed method can simultaneously provide inertial support and accurate SOC balancing.The stability is also proved using root locus analysis.Finally,simulations under different conditions are carried out to verify the effectiveness of the proposed method. | Yichi Cai Donglian Qi | 2022 | Global Energy Interconnection2022，5，4： | 3 |
| 13 | A grouting simulation method for quick-setting slurry in karst conduit:The sequential flow and solidification method显示文摘It is difficult to temporally and spatially track and characterize the slurry viscosity in flowing water during grouting simulation.In this study,a sequential flow and solidification(SFS)method considering the spatial-temporal evolution of slurry viscosity in flowing water in karst conduit is proposed.First,a time-dependent model for the threshold function of slurry viscosity is established.During the grouting process,the spatial-temporal evolution of slurry viscosity is revealed by tracking the diffusion behavior of the slurry injected at different times.This method is capable of describing the gradual solidification process of the slurry during grouting.Furthermore,a physical model of grouting in a karst conduit is developed.Second,the effectiveness of the SFS method in grouting simulation is verified by the experiment of grouting conduit in flowing water.The SFS method enables real-time monitoring of fluid velocity and pressure during grouting in flowing water and provides a feasible calculation method for revealing the grouting plugging mechanism in complex karst conduits at different engineering scales.In addition,it can be used to guide the design of grouting tests in flowing water,improve cost efficiency,and provide theoretical basis for optimizing grouting design and slurry selection. | Zhenhao Xu Dongdong Pan Shucai Li Yichi Zhang Zehua Bu Jie Liu | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，2： | 3 |
| 14 | 3-D Fracture Network Modelling in Hydropower Engineering Based on Optimal Monte Carlo Simulation显示文摘Effectively and accurately modelling the spatial relation of fracture surfaces is crucial in the design and construction of large hydropower dams having a complex underlying geology. However, fracture surfaces are randomly formed and vary greatly with respect to their spatial distribution, which makes the construction of accurate 3-D models challenging. In this study, we use an optimal Monte Carlo simulation and dynamic conditioning to construct a fracture network model. We found the optimal Monte Carlo simulation to effectively reduce the error associated with the Monte Carlo method and use dynamic conditioning to ensure the consistency of the model with the actual distribution of fractures on the excavation faces and outcrops. We applied this novel approach to a hydropower station on the Jinshajiang River, China. The simulation results matched the real sampled values well, confirming that the model is capable of effectively and accurately simulating the spatial relations in a fracture network. | Pan Yue Denghua Zhong Fugen Yan Han Wu Yichi Zhang | 2017 | Transactions of Tianjin University2017，23，4： | 2 |
| 15 | Tracking Survey of Immune Effects of Highly Pathogenic Porcine Reproductive and Respiratory Syndrome (HP-PRRS) in Changping District, Beijing City显示文摘The epidemiology of highly pathogenic porcine reproductive and respiratory syndrome( HP-PRRS) in Changping District,Beijing City was investigated from 2010 to 2015. Through statistics of vaccine,immune procedure and antibody levels,the epidemic prevention effect of HP-PRRS in Changping District was scientifically assessed. | Xing Guodong Lv Yanqiu Qiu Hailian Gao Xiaobo Zhang Yichi Wang Yuewei Kang Xiaojie | 2017 | Animal Husbandry and Feed Science2017，9，5： | 2 |
| 16 | Ordinal optimization approach to rare event probability problems显示文摘 | Ho Yichi Larson Michael E | 1995 | Discrete Event Dynamic Systems: Theory and Applications1995，5，23： | 1 |
| 17 | An explanation of ordinal optimization: Soft computing for hard problems显示文摘 | Ho Yichi | 1999 | Information sciences1999，113，34： | 1 |
| 18 | Application of reinforcement learning for Agent based production scheduling显示文摘 | WANG Yichi USHER J M | 2005 | Engineering Applications of Artificial Intelligence2005，18，1： | 1 |
| 19 | Glacier change over the past four decades in the middle Chinese Tien Shan显示文摘 | Li Baolin Zhu Axing Zhang Yichi | 2006 | Journal of Glaciology2006，52，178： | 1 |
| 20 | Formation and evolution of sand deserts in Xinjiang, Northwest China:II. The palaeo-environmental reconstruction显示文摘基于 palaeoclimatic 和地质的历史和人的历史时期的 palaeoenvironmental 证据,这篇论文在 Xinjiang 在沙的沙漠的发展考察研究和进步。它指出在 Xinjiang 的构造结构的特征使 Tarim 盆和被焚风效果极大地影响的 Junggar 盆从行星的风系统发源西,东方亚洲海洋大陆人季风和地形学的山脉山谷弯屈。气候和环境的地区性的模式自从第四级被变化在第二等的规模伴随的全面坚持的干旱描绘。在盆并且在边缘的风神的沉积的形成是对全球气候变化的潜在的回答,特别地,亚洲内地的 aridification 由西藏的高原和它的包围高地升起推出了。为关于 Taklamakan 沙漠的形成时间的问题,因为在以前的研究使用的研究方法,目标和信息搬运人是不同的,目前在学术圆有许多争论。从在边并且在这些沙的沙漠和他们的按年代先后的数据的内地的风神的扔 / 摇的证据显示干旱气候和土地出现自从第三级的时期,风神的进程发生在 Tarim 盆和它的内地区域的边。然而,在集体规模的这些过程的持续时间时间应该在中间的更新世以后开始了并且持续到 Holocene。沙丘领域在的出现最近在绿洲区域的 2000 年应该被人的因素极大地影响。 | ZHU Bingqi YU Jingjie QIN Xiaoguang Patrick RIOUAL ZHANG Yichi XIONG Heigang | 2014 | Journal of Geographical Sciences2014，24，3： | 1 |
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