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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 | 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 |
| 6 | 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 |
| 7 | 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 |
| 8 | 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 |
| 9 | 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 |
| 10 | 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 |
| 11 | 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 |
| 12 | 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 |
| 13 | 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 |
| 14 | Ultrastable low-cost colloidal quantum dot microlasers of operative temperature up to 450 K显示文摘Quantum dot microlasers,as multifunaional optical source components,are of great importance for full-color highpixel display,miniaturized coherent lighting,and on-chip integrated photonic and electronic circuits.Since the first synthesis of colloidal quantum dots(CQD)in the 1990s,motivation to realize high-performance low-cost CQD micro-/nanolasers has been a driving force for more than three decades.However,the low packing density,inefficient coupling of CQDs with optical cavities,and the poor thermal stability of miniaturized complex systems make it challenging to achieve practical CQD microVnanolasers,especially to combine the continuous working ability at high temperatures and the low-cost potential with mass-produced synthesis technologies.Herein,we developed closepacked CQD-assembled microspheres and embedded them in a silica matrix through the rapid self-aggregation and solidification of CdSe/ZnS CQD.This technology addresses the core issues of photoluminescence(PL)quenching effect and low optical gain in traditional CQD laser research.High-efficiency low-threshold CQD microlasers are demonstrated together with long-playing(40 min)working stability even at 450 K under pulsed laser excitation,which is the highest operational temperature for CQD lasers.Moreover,single-mode CQD microlasers are obtained with tunable wavelengths across the entire visible spectral range.The chemosynthesis process supports the mass-produced potential of high-density integrated CQD microlasers,promoting CQD-based low-cost high-temperature microdevices. | Hao Chang Yichi Zhong Hongxing Dong Zhenyu Wang Wei Xie Anlian Pan Long Zhang | 2021 | Light(Science & Applications)2021，10，4： | 1 |
| 15 | Distributed Intrusion Detection System in a Multi-layerNetwork Architecture of Smart Grids 显示文摘 | ZHANG Yichi WANG Lingfeng SUN Weiqing | 2011 | IEEE Transactions on Smart Grid2011，2，4： | 1 |
| 16 | A generalizable strategy based on the rule of“like dissolves like”to construct porous liquids with low viscosity for CO_(2)capture显示文摘Porous liquids(PLs),an emerging porous material with permanent cavities,have attracted extensive attention in recent years.However,the current construction methods are complicated and resulting PLs possess high viscosity values,which cannot meet the requirements of practical industrial applications.Herein,we demonstrate a generalizable and simple strategy to prepare type III PLs with low viscosity based on the rule of“like dissolves like”.Specifically,the monoglycidyl ether terminated polydimethylsiloxane(denoted by E-PDMS)is attached to the surface of Universitetet i Oslo(UiO)-66-NH_(2)via covalent linkage,constructing the pore generator(UiO-66-NH_(2)-E-PDMS,denoted by P-UiO-66).Then,P-UiO-66 is dispersed into different types and amounts of sterically hindered solvents(PDMS400 or PDMS6000),obtaining a series of type III PLs(denoted by P-UiO-66-PLs)with permanent cavities and low viscosities.The gas sorption-desorption test shows that P-UiO-66-PLs have an enormous potential for CO_(2)/N_(2) selective separation.Besides,the porosity of P-UiO-66-PLs and the CO_(2)sorption mechanism are demonstrated by molecular simulation.Furthermore,the generality of the synthesis strategy is confirmed by the successful construction of PLs using two other amino-metal-organic frameworks(MOFs)(MIL-53(Al)-NH_(2)and MIL-88B(Fe)-NH_(2)).Importantly,it’s worth noting that the strategy based on the rule of“like dissolves like”sheds light on the preparation of other types of PLs for task-specific applications. | Yangyang Xin Hailong Ning Dechao Wang(✉) Xiaoqian Li Wendi Fan Xiaoqian Ju Hongni Wang Yichi Zhang Zhiyuan Yang Dongdong Yao Yaping Zheng | 2023 | Nano Research2023，16，7： | 1 |
| 17 | Synthesis and characterization of acrylic modified epoxy prepolymers for UV-curable adhesives显示文摘 | Yichi Chen Hongmei Zhang Liqun Zhu Tao He Weiping Li and Huicong Liu | | 0，，30： | 1 |
| 18 | Electrical characteristics of laminar propane flame during head-on quenching显示文摘The electrical characteristics of laminar propane flame during head-on quenching were investigated experimentally and computationally.A variable small electric field was applied between the burner and the quenching plate,which recorded flame current as a function of the height of the quenching plate,for both polarities,different premixed-air volume,and quenching plate materials.More detailed information of flame,such as the distribution of OH radical and main charged species(H3O+and e-)were obtained by using numerical simulation.The results showed that during the head-on quenching,the resistance of the propane flame is on the order of 108Ω,the flame current increases with the increase of the premixed-air volume,and the effect of the quenching plate materials on the flame current is negligible.In addition,it is found that the direction of the electric field has a significant influence on the flame current,indicating the'rectifier'characteristics of the flame.Moreover,it is interestingly found that the trend of flame current for burner-(burner is negative)is more consistent with the trend of the maximum OH mole concentration than for burner+(burner is positive),which indicates that the trend of flame current for burner-can more accurately reflect the combustion state during head-on quenching.And it would be a better choice to use burner as the negative electrode when diagnosing the combustion state with an applied electric field. | GUO Li ZHAI Ming ZHANG YiChi DONG Peng | 2020 | Science China(Technological Sciences)2020，63，8： | 1 |
| 19 | Glacier change over the past four decades in the middle Chinese Tian Shan 显示文摘 | Li Baolin Zhu Axing Zhang Yichi | 2006 | Journal of Glaciology2006，52，178： | 1 |
| 20 | Weakly-coupled mode division multiplexing over conventional multi-mode fiber with intensity modulation and direct detection显示文摘Multi-mode fiber(MMF)links are expected to greatly enhance capacity to cope with rapidly increasing data traffic in optical short-reach systems and networks.Recently,mode division multiplexing(MDM)over MMF has been proposed,in which different modes in MMF are utilized as spatial channels for data transmission.Stronglycoupled MDM techniques utilizing coherent detection and multiplex-input-multiplex-output(MIMO)digital signal processing(DSP)are complex and expensive for shortreach transmission.So the weakly-coupled approach by significantly suppressing mode coupling in the fiber and optical components has been proposed.In this way,the signals in each mode can be independently transmitted and received using conventional intensity modulation and direct detection(IM-DD).In this paper,we elaborate the key technologies to realize weakly-coupled MDM transmission over conventional MMF,including mode characteristic in MMF and weakly-coupled mode multiplexer/ demultiplexer(MUX/DEMUX).We also present the upto-date experimental results for weakly-coupled MDM transmission over conventional OM3 MMF.We show that weakly-coupled MDM scheme is promising for high-speed optical interconnections and bandwidth upgrade of already-deployed MMF links. | Juhao LI Zhongying WU Dawei GE Jinglong ZHU Yu TIAN Yichi ZHANG Jinyi YU Zhengbin LI Zhangyuan CHEN Yongqi HE | 2019 | Frontiers of Optoelectronics2019，12，1： | 1 |
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