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33篇 您的检索式:作者名="Daming Yang"
    题名 作者 年代 出处 被引量
1Climatic control of plant species richness along elevation gradients in the Longitudinal Range-Gorge Region显示文摘在纵的范围峡区域(LRGR ) 在种类丰富探索举起坡度并且评估气候的变量和区域怎么可以解释种类丰富的模式, 5 座山被选择。根据举起,山,种类丰富,区域的价值和气候的变量的维的坡度在每 100 m 地区被计算。在沿着举起坡度的种子工厂种类丰富和气候的变量和区域之间的关系被分析。结果显示出那:(1 ) 种类丰富的 Elevational 模式不是制服并且能被划分在到二种类型。种类丰富的价值在低地是更高的然后与在热带山增加举起 monotonically 减少。种类丰富在副热带的山在举起坡度的更低的一半向高价值与偏爱有单峰的模式。(2 ) 种类密度的模式在沿着举起坡度的种类丰富与那一样。(3 ) 在气候变量之中,实际土壤水分蒸发蒸腾损失总量(AET ) 与种类丰富作为水精力平衡的大小有强壮的关系。在种类丰富的衰落在副热带的山的低地由于更高的温度和更少的降水。LIU Yang ZHANG YiPing HE DaMing CAO Min ZHU Hua 2007Chinese Science Bulletin2007,52,A02:9
2Quantification of microcystin-producing and non-microcystin producing Microcystis populations during the 2009 and 2010 blooms in Lake Taihu using quantitative real-time PCR显示文摘Lake Taihu,a large,shallow hypertrophic freshwater lake in eastern China,has experienced lake-wide toxic cyanobacterial blooms annually during summer season in the past decades.Spatial changes in the abundance of hepatotoxin microcystin-producing and nonmicrocystin producing Microcystis populations were investigated in the lake in August of 2009 and 2010.To monitor the densities of the total Microcystis population and the potential microcystin-producing subpopulation,we used a quantitative real-time PCR assay targeting the phycocyanin intergenic spacer(PC-IGS) and the microcystin synthetase gene(mcyD),respectively.On the basis of quantification by real-time PCR analysis,the abundance of potential toxic Microcystis genotypes and the ratio of the mcyD subpopulation to the total Microcystis varied significantly,from 4.08×104 to 5.22×107 copies/mL,from 5.7% to 65.8%,respectively.Correlation analysis showed a strong positive relationship between chlorophyll-a,toxic Microcystis and total Microcystis;the abundance of toxic Microcystis correlated positively with total phosphorus and ortho-phosphate concentrations,but negatively with TN:TP ratio and nitrate concentrations.Meanwhile the proportion of potential toxic genotypes within Microcystis population showed positive correlation with total phosphorus and ortho-phosphate concentrations.Our data suggest that increased phosphorus loading may be a significant factor promoting the occurrence of toxic Microcystis bloom in Lake Taihu.Daming Li Fanxiang Kong Xiaoli Shi Linlin Ye Yang Yu Zhen Yang 2012Journal of Environmental Sciences2012,24,2:5
3Feed intake prediction model for group fish using the MEA-BP neural network in intensive aquaculture显示文摘In aquaculture,the accurate prediction of feed intake for group fish is considered to be crucial to any feeding system.Previous studies mainly used mathematical statistics to establish the mapping relationship between feed intake and influencing factors.The result was easily influenced by subjective experience.To solve the above issues,this paper proposed a feed intake prediction model for group fish using the back-propagation neural network(BPNN)and mind evolutionary algorithm(MEA).Firstly,four factors,including water temperature,dissolved oxygen,the average fish weight and the number of fish were selected as the input of the BPNN model.Secondly,the initial weight and threshold of the BPNN were optimized by the MEA to improve the matching precision.Finally,the prediction model was achieved after training.Experimental results showed that the correlation coefficient between the predicted and measured values reached 0.96.And the root mean squared error,mean square error,mean absolute error,mean absolute percent error of the model was 6.89,47.53,6.17 and 0.04,respectively.In addition,the proposed method also had the better nonlinear fitting ability than BPNN and GA-BP.By using an intelligent optimization algorithm,the mapping relationship between fish intake and environmental factors was automatically established,thus avoiding the subjectivity of traditional methods.Therefore,it can lay a theoretical foundation for the development of intelligent feeding equipment and meet the needs of the smart fishery.Lan Chen Xinting Yang Chuanheng Sun Yizhong Wang Daming Xu Chao Zhou 2020Information Processing in Agriculture2020,7,2:5
4Source-sink System and Sedimentary Model of Progradational Fan Delta Controlled by Restricted Ancient Gully:An Example in the Enping Formation in the Southern Baiyun Sag,Pearl River Mouth Basin,Northern South China Sea显示文摘Tectonic activity occurred during the depositional period of the Enping Formation in the southern Baiyun Sag in the Pearl River Mouth Basin,with a series of synsedimentary faults and a set of large fan delta reservoir bodies developing.There is no data from drilling,cores,etc.for this area,so this paper applies three-dimensional seismic data to study the structural style of the steep slope zone,the seismic facies characteristics of fan deltas,and the source-sink system and sedimentary model of the Enping Formation.The control action of tectonic activity on fan deltaic sedimentary systems is studied by combining interpretation of fault systems,dissection of structural styles,seismic reflection structure,seismic facies geometry,and seismic attribute analysis,together with theoretical analysis of the source-sink deposition process.The Baiyun Sag has experienced tectonic activity since the Eocene,and a series of synsedimentary faults are developed in the southern steep slope zone.Under the common control of multiple large synsedimentary faults,a large ancient gully formed in the steep slope zone in the south,which gradually widened from south to north.The uplift area in the southern part of the sag was exposed for a long time during the deposition of the Enping Formation and consequently suffered weathering and erosion.The resulting sediments were transported through a system of provenance channels composed of slopes and an ancient gully to the depression area,where they were deposited and eventually converged to form a large fan delta.The fan delta presents the overall characteristics of NS strong wedge reflection and EW strong domal reflection—thick in the middle part and thin in the wings.It displays a lobe-shaped distribution on the plane,with the fan root pointing to the south slope.According to differences in reflection intensity from bottom to top,it can be subdivided into three stages of progradational sedimentary bodies—the southern uplift and denudation zone,the large ancient gully,and the fan delta—which together constitute a complete source-sink system.This represents a sedimentary model of progradational fan delta under the overall joint control of the re stricted ancient gully and syndepositional faults.FENG Congjun YAO Xingzong YANG Haizhang LI Daming SUN Mengsi 2021Acta Geologica Sinica(English Edition)2021,95,1:4
5Formation mechanism and height calculation of the caved zone and water-conducting fracture zone in solid backfill mining显示文摘To study the heights of the caved zone and water-conducting fracture zone in backfill mining,the failure mechanism of strata during backfill mining was analyzed,and a method for determining the heights of the two zones was proposed based on key strata theory.The movement and failure regularity of the strata above the backfilling panel were revealed through numerical simulation.Considering the geologic conditions of the CT101 backfilling panel,the height of the fracture zone was determined using the proposed method along with empirical calculation,numerical simulation,and borehole detection.The results of the new calculation method were similar to in situ measurements.The traditional empirical formula,which is based on the equivalent mining height model,resulted in large errors during calculation.The findings indicate the reliability of the new method and demonstrate its significance for creating reference data for related studies.Lei Li Fengming Li Yong Zhang Daming Yang Xue Liu 2020International Journal of Coal Science & Technology2020,7,1:3
6Sodium tungsten bronze(Na_(x)WO_(3))-doped near-infrared-shielding bulk glasses for energy-saving applications显示文摘Tungsten bronze coatings and films have attracted global attention for their applications in near-infrared(NIR)-shielding windows.However,they are unstable in strong ultraviolet,humid heat,alkaline and/or oxidizing environments and are difficult to be coated on glass surfaces with complex shape.Here,we address these limitations by doping sodium tungsten bronze(Na_(x)WO_(3))into bulk glasses using a simple glass melting method.X-ray diffraction,Raman spectroscopy,X-ray photoelectron spectroscopy,TEM and SEM-EDS characterization confirmed the presence of sodium tungsten bronze(Na_(x)WO_(3))functional units inside the 34SiO_(2)-38B_(2)O_(3)-28NaF glass matrix.Because the functional units are well protected by the glass matrix,the fabricated glasses are stable under hot,humid,oxidizing conditions,as well as under ambient conditions,with no change after 360 days.The NIR-shielding performance of these glasses can be adjusted to as high as 100%by varying WO_(x)concentration(2-8 mol%)and quenching temperature(1000-1400℃).With a content of 6 mol%WO_(x)and a quenching temperature of 1000℃,the bulk glass shows 63%transmission of visible light and only 11%transmission of NIR light at 1100 nm.Thermal insulation experiments show that the NIR-shielding performance of the glasses are far superior to commercial soda lime window glass or indium-doped tin oxide(ITO)glass,and comparable to cesium tungsten bronze coated glass.The novel bulk glasses have higher stability,simpler processing,and can be easily made into complex shapes,making them excellent alternative materials for energy-saving glasses.Guang Yang Yunhang Qi Daming Hu Haochen Wang Hongfei Chen Liangmiao Zhang Chuanxiang Cao Bin Liu Fang Xia Yanfeng Gao 2021Journal of Materials Science & Technology2021,,30:3
7Direct Growth of Graphene on Silicon by Metal-Free Chemical Vapor Deposition显示文摘The metal-free synthesis of graphene on singlecrystal silicon substrates, the most common commercial semiconductor, is of paramount significance for many technological applications. In this work, we report the growth of graphene directly on an upside-down placed,single-crystal silicon substrate using metal-free, ambientpressure chemical vapor deposition. By controlling the growth temperature, in-plane propagation, edge-propagation, and core-propagation, the process of graphene growth on silicon can be identified. This process produces atomically flat monolayer or bilayer graphene domains, concave bilayer graphene domains, and bulging few-layer graphene domains. This work would be a significant step toward the synthesis of large-area and layer-controlled, high-quality graphene on single-crystal silicon substrates.Lixuan Tai Daming Zhu Xing Liu Tieying Yang Lei Wang Rui Wang Sheng Jiang Zhenhua Chen Zhongmin Xu Xiaolong Li 2018Nano-Micro Letters2018,10,2:2
8Robust facial landmark detection and tracking across poses and expressions for in-the-wild monocular video显示文摘We present a novel approach for automatically detecting and tracking facial landmarks acrossposesandexpressionsfromin-the-wild monocular video data,e.g.,You Tube videos and smartphone recordings.Our method does not require any calibration or manual adjustment for new individual input videos or actors.Firstly,we propose a method of robust 2D facial landmark detection across poses,by combining shape-face canonical-correlation analysis with a global supervised descent method.Since 2D regression-based methods are sensitive to unstable initialization,and the temporal and spatial coherence of videos is ignored,we utilize a coarse-todense 3D facial expression reconstruction method to refine the 2D landmarks.On one side,we employ an in-the-wild method to extract the coarse reconstruction result and its corresponding texture using the detected sparse facial landmarks,followed by robust pose,expression,and identity estimation.On the other side,to obtain dense reconstruction results,we give a face tracking flow method that corrects coarse reconstruction results and tracks weakly textured areas;this is used to iteratively update the coarse face model.Finally,a dense reconstruction result is estimated after it converges.Extensive experiments on a variety of video sequences recorded by ourselves or downloaded from You Tube show the results of facial landmark detection and tracking under various lighting conditions,for various head poses and facial expressions.The overall performance and a comparison with state-of-art methods demonstrate the robustness and effectiveness of our method.Shuang Liu Yongqiang Zhang Xiaosong Yang Daming Shi Jian J.Zhang 2017Computational Visual Media2017,3,1:2
9Insufficient thermalization effects on determining fission-track ages显示文摘Fission-Track Dating (FTD) has been developed as a useful technique for geological studies. Parent elements are measured by counting 235 U tracks induced by thermal neutrons. If insufficient thermalization occurs, fission of 238 U and 232 Th will be induced, and further measurement error will be introduced. Therefore, whether the neutrons are well thermalized or not will affect the FTD results. Due to requirement of safe operation, the 101 reactor was terminated in 2007. By using the 492 reactor as the new thermal neutron reactor, our present paper will attempt to study the feasibility and the potential influence on FTD. By irradiating monitor glass SRM612 and CN5 in pairs, we will study the thermalization situation of the 492 reactor. Irradiated data show that thermal neutrons are not evenly distributed either in horizontal or in vertical dimension. Especially, horizontal heterogeneity is obvious. But we discovered that proper irradiation position in the reactor can meet the requirement of FTD. Under the current irradiation condition, we calculated and assessed the insufficient thermalization effects on determining fission-track ages. We found that the difference between the 232 Th/ 238 U ratios of samples and standards is the main factor to the experiment results. The results will not be affected if the 232 Th/ 238 U value of samples is equal to the standard samples. However, if the 232 Th/ 238 U ratio is larger than that of the standards, the results will be smaller than actual ages. Comparatively, the ages will be more than expected if the 232 Th/ 238 U ratio is less. Therefore, to reduce the irradiation error, we suggest either locating the position of irradiation strictly, or minimizing the influence of lateral heterogeneity by reducing the amount of each sample package. Additionally, accuracy of the experimental results can be improved by increasing standard samples to adjust ζ value and using the monitor of standard glass SRM612 and CN5 together.PANG JianZhang ZHENG DeWen WAN JingLin LI DaMing ZHANG PeiZhen YANG Jing 2013Science China Earth Sciences2013,56,7:2
10^(40)Ar/^(39)Ar analysis of supergene yavapaiite and preliminary investigation on Ar closure temperature显示文摘Yavapaiite (KFe(SO4)2) is a new sulfate mineral with high potassium content, discovered in the oxidation zone of non-ferrous metal mining in the Tu-Ha Basin, Xinjiang Uygur Autonomous Region, northwestern China.Dating of this mineral by the K-Ar and 40Ar/39Ar method allows us to study the time and process of the region's aridity, and further we can provide some insight into the influence of not only the Tibetan Plateau uplift but also formation and evolution of polar ice caps on climate of this region.However, as the temperature of this region is up to 60℃ in summer, it is still questionable whether this high temperature causes the diffusive loss of 40Ar from yavapaiite in a long time, or whether the fine grain of the mineral can lead to diffusive loss of 40Ar from yavapaiite.These are important for interpreting the mineral age data.According to diffusion theory, we use 40Ar/39Ar step heating experiment to determine the apparent Ar diffusivity.Then we present a simple model of diffusive loss and radiogenic in-growth to evaluate the effect of extreme high ambient temperature and the grain size upon the Ar age.The experimental results show that the diffusion parameters as follows: the activation energy Ea is 71.30 kcal/mol and the frequency factor logD0/a2 is 13.71/s, the corresponding closure temperature Tc is 294℃ (assuming a cooling rate of 10℃/Ma), and the activation energy and closure temperature are very high.The simulation results show that the high ambient temperature and the grain size have no effect on the Ar age after yavapaiite was precipitated.Furthermore, the reproducibility of the age attests to the suitability of supergene yavapaiite for K-Ar and 40Ar/39Ar dating.YANG Jing ZHENG DeWen LI DaMing XU YingXia YU ShuYan 2012Science China Earth Sciences2012,55,12:2
11Development and validation of a novel nomogram to predict aneurysm rupture in patients with multiple intracranial aneurysms:a multicentre retrospective study显示文摘Background and purpose Approximately 15%–45%of patients with unruptured intracranial aneurysms have multiple intracranial aneurysms(MIAs).Determining which one is most likely to rupture is extremely important for treatment decision making for MIAs patients.This study aimed to develop and validate a nomogram to evaluate the per-aneurysm rupture risk of MIAs patients.Methods A total of 1671 IAs from 700 patients with MIAs were randomly dichotomised into derivation and validation sets.Multivariate logistic regression analysis was used to select predictors and construct a nomogram model for aneurysm rupture risk assessment in the derivation set.The discriminative accuracy,calibration performance and clinical usefulness of this nomogram were assessed.We also developed a multivariate model for a subgroup of 158 subarachnoid haemorrhage(SAH)patients and compared its performance with the nomogram model.Results Multivariate analyses identified seven variables that were significantly associated with IA rupture(history of SAH,alcohol consumption,female sex,aspect ratio>1.5,posterior circulation,irregular shape and bifurcation location).The clinical and morphological-based MIAs(CMB-MIAs)nomogram model showed good calibration and discrimination(derivation set:area under the curve(AUC)=0.740 validation set:AUC=0.772).Decision curve analysis demonstrated that the nomogram was clinically useful.Compared with the nomogram model,the AUC of multivariate model developed from SAH patients had lower value of 0.730.Conclusions This CMB-MIAs nomogram for MIAs rupture risk is the first to be developed and validated in a large multi-institutional cohort.This nomogram could be used in decision-making and risk stratification in MIAs patients.Xin Feng Xin Tong Fei Peng Hao Niu Peng Qi Jun Lu Yang Zhao Weitao Jin Zhongxue Wu Yuanli Zhao Aihua Liu Daming Wang 2021Stroke & Vascular Neurology2021,6,3:2
12Option Game with Poisson Jump Process in Company Radical Technological Innovation显示文摘You Daming Yang Xiaohui 2014Technological Forecasting&Social Change2014,81,:1
13Ultrafine polycrystalline titania nanofibers for superior sodium storage显示文摘Sodium ion batteries have a huge potential for large-scale energy storage for the low cost and abundance of sodium resources. In this work, a novel structure of ultrafine polycrystalline TiO2 nanofibers is prepared on nickel foam/carbon cloth by a simple vapor deposition method. The as-prepared TiO2 nanofibers show excellent performance when used as anodes for sodium-ion batteries. Specifically, the TiO2 nanofibers@nickel foam electrode delivers a high reversible capacity of 263.2 m Ahg^-1 at 0.2 C and maintains a considerable capacity of 144.2 m Ahg^-1 at 10 C. The TiO2 nanofibers@carbon cloth electrode also shows excellent high-rate capability, sustaining a capacity of 148 m Ahg^-1 after 20 0 0 cycles at 10 C. It is believed that the novel nanofibrous structure increases the contact area with the electrolyte and greatly shortens the sodium ion diffusion distance, and meanwhile, the polycrystalline nature of nanofibers exposes more intercalation sites for sodium storage. Furthermore, the density functional theory calculations exhibit strong ionic interactions between the exposed TiO2(101) facets and sodium ions, leading to a preferable sodiation/desodiation process. The unique structural features endow the TiO2 nanofibers electrodes great advantages in rapid sodium storage with an outstanding high-rate capability.Zhidan Diao Daming Zhao Chunxiao Lv Hongli Liu Dongjiang Yang Shaohua Shen 2019Journal of Energy Chemistry2019,28,11:1
14A novel non-dripping oligomeric flame retardant for polyethylene terephthalate 显示文摘BAN Daming WANG Yuzhong YANG Bing 2004European Polymer Journal2004,,40:1
15Preparation of Silicon Carbide with High Properties显示文摘In order to prepare silicon carbide with high properties, three kinds of SiC powders A, B, and C with different composition and two kinds of additives, which were Y2O3-A12O3 system and Y2O3-La2O3 system, were used in this experiment. The properties of hot-pressed SiC ceramics were measured. With the same additives, different SiC powder resulted in different properties. On the other hand, with the same SiC powder, increasing the amount of the additive Y2O3Al2O3 improved properties of SiC ceramics at room temperature, and increasing the amount of the additive Y2O3-La2O3 improved property SiC ceramics at elevated temperature. In addition. the microstructure of SiC ceramics was studied by scanning electron microscopy.Guangiiang YUAN Yang ZHOU and Daming CHEN National Key Laboratory of Advanced Composites, Beijing institute of Aeronautical Materials, P.O. Box 81-3, Beijing 100095, China Bangsheng LI School of Materials Science and Engineering, Harbin institute of Tech 2001Journal of Materials Science & Technology2001,17,1:1
16Dynamics of dissolved organic carbon after a cyanobacterial bloom in hypereutrophic Lake Taihu (China)显示文摘Linlin Ye Xiao Shi Xiaodong Wu Min Zhang Yang Yu Daming Li Fanxiang Kong 2011Limnologica2011,,4:1
17Method for segmentation of overlapping fish images in aquaculture显示文摘Individual fish segmentation is a prerequisite for feature extraction and object identification in any machine vision system.In this paper,a method for segmentation of overlapping fish images in aquaculture was proposed.First,the shape factor was used to determine whether an overlap exists in the picture.Then,the corner points were extracted using the curvature scale space algorithm,and the skeleton obtained by the improved Zhang-Suen thinning algorithm.Finally,intersecting points were obtained,and the overlapped region was segmented.The results show that the average error rate and average segmentation efficiency of this method was 10%and 90%,respectively.Compared with the traditional watershed method,the separation point is accurate,and the segmentation accuracy is high.Thus,the proposed method achieves better performance in segmentation accuracy and effectiveness.This method can be applied to multi-target segmentation and fish behavior analysis systems,and it can effectively improve recognition precision.Chao Zhou Kai Lin Daming Xu Jintao Liu Song Zhang Chuanheng Sun Xinting Yang 2019International Journal of Agricultural and Biological Engineering2019,12,6:1
18Science with the 2.5-meter Wide Field Survey Telescope(WFST)显示文摘The Wide Field Survey Telescope(WFST) is a dedicated photometric surveying facility being built jointly by University of Science and Technology of China(USTC) and the Purple Mountain Observatory(PMO). It is equipped with a 2.5-meter diameter primary mirror, an active optics system, and a mosaic CCD camera with 0.73 gigapixels on the primary focal plane for highquality image capture over a 6.5-square-degree field of view. The installation of WFST near the summit of Saishiteng mountain in the Lenghu region is scheduled in summer of 2023, and the operation is planned to start three months later. WFST will scan the northern sky in four optical bands(u, g, r and i) at cadences from hourly/daily in the deep high-cadence survey(DHS) program, to semi-weekly in the wide field survey(WFS) program. During a photometric night, a nominal 30 s exposure in the WFS program will reach a depth of 22.27, 23.32, 22.84, and 22.31(AB magnitudes) in these four bands, respectively, allowing for the detection of a tremendous amount of transients in the low-z universe and a systematic investigation of the variability of Galactic and extragalactic objects. In the DHS program, intranight 90 s exposures as deep as 23(u) and 24 mag(g), in combination with target of opportunity follow-ups, will provide a unique opportunity to explore energetic transients in demand for high sensitivities, including the electromagnetic counterparts of gravitational wave events, supernovae within a few hours of their explosions,tidal disruption events and fast, luminous optical transients even beyond redshift of unity. In addition, the final 6-year co-added images, anticipated to reach g■25.8 mag in WFS or 1.5 mags deeper in DHS, will be of fundamental importance to general Galactic and extragalactic science. The highly uniform legacy surveys of WFST will serve as an indispensable complement to those of the Vera C. Rubin Observatory's Legacy Survey of Space and Time(LSST) that monitors the southern sky.Tinggui Wang Guilin Liu Zhenyi Cai Jinjun Geng Min Fang Haoning He Ji-an Jiang Ning Jiang Xu Kong Bin Li Ye Li Wentao Luo Zhizheng Pan Xuefeng Wu Ji Yang Jiming Yu Xianzhong Zheng Qingfeng Zhu Yi-Fu Cai Yuanyuan Chen Zhiwei Chen Zigao Dai Lulu Fan Yizhong Fan Wenjuan Fang Zhicheng He Lei Hu Maokai Hu Zhiping Jin Zhibo Jiang Guoliang Li Fan Li Xuzhi Li Runduo Liang Zheyu Lin Qingzhong Liu Wenhao Liu Zhengyan Liu Wei Liu Yao Liu Zheng Lou Han Qu Zhenfeng Sheng Jianchun Shi Yiping Shu Zhenbo Su Tianrui Sun Hongchi Wang Huiyuan Wang Jian Wang Junxian Wang Daming Wei Junjie Wei Yongquan Xue Jingzhi Yan Chao Yang Ye Yuan Yefei Yuan Hongxin Zhang Miaomiao Zhang Haibin Zhao Wen Zhao 2023Science China(Physics,Mechanics & Astronomy)2023,66,10:1
19Propagation and extinction of premixed C 5 –C 12 n -alkane flames显示文摘Chunsheng Ji Enoch Dames Yang L. Wang Hai Wang Fokion N. Egolfopoulos 2009Combustion and Flame2009,,2:1
20Effect of cooling aging on microstructure and mechanical properties of an Al–Zn–Mg–Cu alloy显示文摘Yan Liu Daming Jiang Bingqing Li Wenshu Yang Jie Hu 2013Materials and Design2013,,:1
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