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Geomorphic change in Dingzi Bay, East China since the 1950s： impacts of human activity and fluvial input

Frontiers of Earth Science 2017年第2期11卷 385-396页

作者： qing tian qing WANG Yalong LIU Oceanic Modeling and Observation Laboratory School of Marine Science Nanjing University of Information Science and Technology Nanjing 210044 China Coast Institute Ludong University Yantai 264025 China Yantai Marine Environmental Monitoring Center Station State Oceanic Administration Yantai 264000 China

This study examines the geomorphic evolution of Dingzi Bay, East China in response to human activity and variations in fluvial input since the 1950s. The analysis is based on data from multiple mathematical methods, along with information obtained from Remote Sensing, Geographic Information System and Global Position System technology. The results show that the annual runoff and sediment load discharged into Dingzi Bay display significant decreasing trends overall, and marked downward steps were observed in 1966 and 1980. Around 60%-80% of the decline is attributed to decreasing precipitation in the Wulong River Basin. The landform types in Dingzi Bay have changed significantly since the 1950s, especially over the period between 1981 and 1995. Large areas of tidal fiats, swamp, salt fields, and paddy fields have been reclaimed, and aquaculture ponds have been constructed. Consequently, the patterns of erosion and deposition in the bay have changed substantially. Despite a reduction in sediment input of 65.68% after 1966, low rates of sediment deposition continued in the bay. However, deposition rates changed significantly after 1981 owing to large-scale development in the bay, with a net depositional area approximately 10 times larger than that during 1961-1981. This geomorphic evolution stabilized following the termination of large-scale human activity in the bay after 1995. Overall, Dingzi Bay has shown a tendency towards silting-up during 1952-2010, with the bay head migrating seaward, the number of channels in the tidal creek system decreasing, and the tidal inlet becoming narrower and shorter. In conclusion, large- scale development and human activity in Dingzi Bay have controlled the geomorphic evolution of the bay since the 1950s.

关键词： sediment load runoff human activity,geomorphic evolution Dingzi Bay

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Ordinal factorization machine with hierarchical sparsity

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Frontiers of Computer Science 2020年第1期14卷 67-83页

作者： Shaocheng GUO Songcan CHEN qing tian College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210000China School of Computer and Software Nanjing University of Information Science and TechnologyNanjing 210044China

Ordinal regression(OR)or classification is a machine learning paradigm for ordinal *** date,there have been a variety of methods proposed including kernel based and neural network based methods with significant ***,existing OR methods rarely consider latent structures of given data,particularly the interaction among covariates,thus losing interpretability to some *** compensate this,in this paper,we present a new OR method:ordinal factorization machine with hierarchical sparsity(OFMHS),which combines factorization machine and hierarchical sparsity together to explore the hierarchical structure behind the input *** the sake of optimization,we formulate OFMHS as a convex optimization problem and solve it by adopting the efficient alternating directions method of multipliers(ADMM)*** results on synthetic and real datasets demonstrate the superiority of our method in both performance and significant variable selection.

关键词： ordinal regression factorization machine hierarchical sparsity interaction modelling

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Wave Propagation in Submerged Pipe Conveying Fluid

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Acta Mechanica Solida Sinica 2019年第4期32卷 483-498页

作者： qing-tian Deng Zhi-chun Yang School of Sciences Changan University Middle-Section of Naner Huan RoadX i’an 710064 Shaanxi People’s Republic of China Department of Mechanical Engineering University of CincinnatiCincinnatiOH 45221-0072USA School of Aeronautics Northwestern Polytechnical University127 Youyi XiluXi’an 710072ShaanxiPeople's Republic of China

A problem of wave propagation in submerged pipe conveying fluid is discussed in this paper. Three different fluid-pipe models are considered: the pipe conveying non-viscous fluid immersed in still fluid, the pipe conveying non-viscous fluid considering hydrostatic pressure and the pipe conveying viscous fluid considering hydrostatic pressure. The Fliiggle shell model and the hydrostatic pressure considered as the static prestress are introduced for the description of pipe and external/internal fluids. The effects of steady viscous forces are obtained by using the time-mean Navier-Stokes equations, and the perturbation pressures can be determined by means of potential flow theory. The wave dispersion curves of a submerged pipe conveying fluid are obtained numerically by considering the coupling conditions. The effects of internal fluid velocity and hydrostatic pressure on phase velocity are also discussed.

关键词： Wave propagation Submerged pipe Hydrostatic pressure Shell theory Conveying fluid Viscous fluid

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“Redistribution” Effect of Lumpy Zone for Gas Flow in BF

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Journal of Iron and Steel Research International 2007年第6期14卷 1-7页

作者： ZHU qing-tian CHENG Shu-sen School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The gas flow from tuyere to raceway zone by blasting involves three distributional zones, such as dripping, cohesive, and lumpy zone. The gas flow distribution in lumpy zone directly affects the gas utilization ration and smooth operation in the blast furnace. However, the furnace closeness brings about great difficulty in the study of high-temperature gas flow. The charging and blasting system affecting the gas flow and whether the top gas flow distribution could reflect its inner condition as well as the furnace state, such as hanging or scaffolding, which have become the main problems for the research on gas flow. Recently, several researches overseas studied gas flow distribution using the numerical simulation method; however, such a research was rare amongst the natives. In this study, the flow model of gas in cohesive and lumpy zone was established using the numerical simulation software and the gas flow distributions with uniform distribution of burden permeability, scaffolding of wall, and nonuniform charge level were analyzed. As a result, the effects of cohesive zone and lower parts on the gas flow are very limited and the charge level largely affects the distribution of top gas flow. Therefore, it was found that the distribution of top gas flow could hardly reflect the inner gas flow. The process is called ＂redistribution＂ effect, which means that the gas flow after passing through the raceway, dripping, and cohesive zone is distributed when it flows into the lumpy zone.

关键词： blast furnace gas flow lumpy zone numerical simulation

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Large Sets and Overlarge Sets of Triangle-Decomposition

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Acta Mathematicae Applicatae Sinica 2007年第1期23卷 123-132页

作者： Zi-hong tian qing-de Kang Institute of Mathematics Hebei Normal University Shijiazhuang 050016 China

There are six types of triangles： undirected triangle, cyclic triangle, transitive triangle, mixed-1 triangle, mixed-2 triangle and mixed-3 triangle. The triangle-decompositions for the six types of triangles have already been solved. For the first three types of triangles, their large sets have already been solved, and their overlarge sets have been investigated. In this paper, we establish the spectrum of LTi（v,λ）, OLTi（v）（i = 1, 2）, and give the existence of LT3（v, λ） and OLT3（v, λ） with λ even.

关键词： Triangle-decomposition large set overlarge set

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Feature Relationships Learning Incorporated Age Estimation Assisted by Cumulative Attribute Encoding

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Computers, Materials & Continua 2018年第9期56卷 467-482页

作者： qing tian Meng Cao Tinghuai Ma School of Computer and Software Nanjing University of Information Science and TechnologyNanjing210044China Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and TechnologyNanjing210044China School of Electrical and Electronic Engineering University of ManchesterManchesterM139PLUK

The research of human facial age estimation(AE)has attracted increasing attention for its wide *** to date,a number of models have been constructed or employed to perform *** the goal of AE can be achieved by either classification or regression,the latter based methods generally yield more promising results because the continuity and gradualness of human aging can naturally be preserved in age ***,the neighbor-similarity and ordinality of age labels are not taken into account *** overcome this issue,the cumulative attribute(CA)coding was *** such age label relationships can be parameterized via CA coding,the potential relationships behind age features are not incorporated to estimate *** this end,in this paper we propose to perform AE by encoding the potential age feature relationships with CA coding via an implicit modeling *** that,we further extend our model to gender-aware AE by taking into account gender variance in aging ***,we experimentally validate the superiority of the proposed methodology.

关键词： Age estimation cumulative attribute gender-aware age estimation correlation relationship learning

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Complex Behavior in a Selective Aging Neuron Model Based on Small World Networks

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Communications in Theoretical Physics 2008年第2期49卷 409-413页

作者： ZHANG Gui-qing CHEN tian-Lun Department of Physics Nankai University Tianjin 300071 China

Complex behavior in a selective aging simple neuron model based on small world networks is investigated. The basic elements of the model are endowed with the main features of a neuron function. The structure of the selective aging neuron model is discussed. We also give some properties of the new network and find that the neuron model displays a power-law behavior. If the brain network is small world-like network, the mean avalanche size is almost the same unless the aging parameter is big enough.

关键词： selective aging self-organized criticality small world networks finite-size-scaling analysis power-law

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A novel method to prepare SPR sensor chips based on photografting molecularly imprinted polymer

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Chinese Chemical Letters 2011年第6期22卷 721-724页

作者： qing Quan Wei tian Xin Wei Key Laboratory of Cluster Science of Ministry of Education Beijing Institute of Technology Beijing 100081 China

A novel method to prepare surface plasmon resonance（SPR） sensor chips based on grafted imprinted polymer is explored. Benzophenone photografting system is used to grow molecularly imprinted polymer（MIP） films from the modified surface of gold *** surface morphology and thickness of MIP films were investigated by scanning electronic microscope（SEM）.The adsorption properties of sensor chip were studied by SPR *** results demonstrate that nano-MIP films can be constructed on the surface of gold substrate with the good adsorption of template molecules.

关键词： Surface plasmon resonance Molecularly imprinted polymer Photografting

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Putative zeatin O-glucosyltransferase OscZOG1 regulates root and shoot development and formation of agronomic traits in rice

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Journal of Integrative Plant Biology 2016年第7期58卷 627-641页

作者： Xiao-Ling Shang Rong-Rong Xie Hua tian,qing-Long Wang and Fang-qing Guo Rong-Rong Xie Hua tian qing-Long Wang Fang-qing Guo The National Key Laboratory of Plant Molecular Genetics and National Center of Plant Gene Research(shanghai) Institute of Plant Physiology&EcologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200032China.

As a ubiquitous reaction, glucosylation controls the bioactivity of cytokinins in plant growth and development. Here we show that genetic manipulation of zeatin-O- glucosylation regulates the formation of important agronomic traits in rice by manipulating the expression of OscZOG1 gene, encoding a putative zeatin O-glucosyltransferase. We found that OscZOG~ was preferentially expressed in shoot and root meristematic tissues and nascent organs. The growth of lateral roots was stimulated in the overexpression lines, but inhibited in RNA interference lines. In shoots, knockdown of OscZOG1 expression by RNA interference significantly im- proved tillering, panicle branching, grain number per panicle and seed size, which are important agronomic traits for grain yield. In contrast, constitutive expression of OscZOG1 leads to negative effects on the formation of the grain-yielding traits with a marked increase in the accumulation levels of cis-zeatin O-glucoside （cZOG） in the transgenic rice plants. In this study,our findings demonstrate the feasibility of improving the critical yield-determinant agronomic traits, including tiller number, panicle branches, total grain number per panicle and grain weight by downregulating the expression level of OscZOG1. Our results suggest that modulating the levels of cytokinin glucosylation can function as a fine-tuning switch in regulating the formation of agronomic traits in rice.

关键词： Cis-zeatin O-glucoside (cZOG) cytokinin glucosylation grain-yield traits lateral root panicle development rice

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Recovery of gold from refractory gold ores: Effect of pyrite on the stability of the thiourea leaching system

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 956-964页

作者： Hong Qin Xue-yi Guo qing-hua tian Lei Zhang School of Metallurgy and Environment Central South UniversityChangsha 410083China National&Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling Changsha 410083China

The extraction of gold from refractory gold ores(RGOs)without side reactions is an extremely promising ***,most RGOs contain large amounts of sulfide,such as ***,investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of *** this work,the effects of pyrite on the stability of the thiourea system were systematically investigated under different *** showed that the decomposition rate of thiourea was accelerated sharply in the presence of *** effect of pyrite on gold recovery in thiourea leaching systems was then confirmed via a series of *** decomposition efficiency of thiourea decreased by 40%and the recovery efficiency of gold increased by 56%after the removal of sulfide by *** optimal conditions,the efficiency of the gold recovery system increased to 83.69%and only 57.92%of thiourea decomposition was *** high consumption of thiourea by the leaching system may be attributed to not only adsorption by mineral particles but also catalytic decomposition by some impurities in the ores,such as pyrite and soluble ferric oxide.

关键词： thiourea leaching stability pyrite refractory gold ores

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