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Search Results: 1 - 10 of 107517 matches for " Jingyuan Linda Zhang "
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Analysis of Seasonal Characteristics of Thermal Environment Based on Urban Sub-Pixel Land Use Types  [PDF]
Jingyuan Cheng, Youshui Zhang
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.611007
Abstract:
Seasonal variations will cause the differences in the distribution of urban thermal environment. Therefore, it is essential for analyzing the distribution of land surface temperature (LST) in different seasons under the same land use type. In this paper, fully constrained least squares method of linear spectral mixture analysis was used to extract the information of land cover fraction. According to the differences in the degree of the urban development, the study area is divided into three regions, for estimating the differences in the distribution of urban thermal environment. Ternary triangular charts were drawn to analyze the impact of each land use type on seasonal UHI. Contribution index (CI) of each land cover was calculated to analysis of the impact of each land use type on LST. The results of this study indicate that the extreme differences in temperature extremes occur in summer, followed by spring, autumn, and winter. In the spring, high LST areas appear in industrial, bare land; high LST areas in summer occur in the CBD, light industrial, and cover crops; the high LST areas in autumn appear in the CBD, high-density residential; in winter, the distribution of low-density and medium-density residential areas, crops and lawns will inhibit the urban heat island effect. The analytical methodologies that be used in this study can help to quantify urban thermal environmental functions effect of different land use type and explore the climate adaptation potential of cities.
Nonlinear frequency conversion using high quality modes in GaAs nanobeam cavities
Sonia Buckley,Marina Radulaski,Jingyuan Linda Zhang,Jan Petykiewicz,Klaus Biermann,Jelena Vuckovic
Physics , 2014, DOI: 10.1364/OL.39.005673
Abstract: We demonstrate the design, fabrication and characterization of nanobeam photonic crystal cavities in (111)-GaAs with multiple high quality factor modes, with large frequency separations (up to 740 nm in experiment, i.e., a factor of 1.5 and up to an octave in theory). Such structures are crucial for efficient implementation of nonlinear frequency conversion. Here, we employ them to demonstrate sum frequency generation from 1300 nm and 1950 nm to 780 nm. These wavelengths are particularly interesting for quantum frequency conversion between Si vacancy centers in diamond and the fiber optic network.
Multimode nanobeam cavities for nonlinear optics: high quality resonances separated by an octave
Sonia Buckley,Marina Radulaski,Jingyuan Linda Zhang,Jan Petykiewicz,Klaus Biermann,Jelena Vuckovic
Physics , 2014, DOI: 10.1364/OE.22.026498
Abstract: We demonstrate the design, fabrication and characterization of nanobeam cavities with multiple higher order modes. Designs with two high Q modes with frequency separations of an octave are introduced, and we fabricate such cavities exhibiting resonances with wavelength separations of up to 740 nm.
Visible Photoluminescence from Cubic (3C) Silicon Carbide Microdisks Coupled to High Quality Whispering Gallery Modes
Marina Radulaski,Thomas M. Babinec,Kai Müller,Konstantinos G. Lagoudakis,Jingyuan Linda Zhang,Sonia Buckley,Yousif A. Kelaita,Kassem Alassaad,Gabriel Ferro,Jelena Vu?kovi?
Physics , 2014, DOI: 10.1021/ph500384p
Abstract: We present the design, fabrication and characterization of cubic (3C) silicon carbide microdisk resonators with high quality factor modes at visible and near infrared wavelengths (600 - 950 nm). Whispering gallery modes with quality factors as high as 2,300 and corresponding mode volumes V ~ 2 ({\lambda}/n)^3 are measured using laser scanning confocal microscopy at room temperature. We obtain excellent correspondence between transverse-magnetic (TM) and transverse-electric (TE) polarized resonances simulated using Finite Difference Time Domain (FDTD) method and those observed in experiment. These structures based on ensembles of optically active impurities in 3C-SiC resonators could play an important role in diverse applications of nonlinear and quantum photonics, including low power optical switching and quantum memories.
Noninvasive genetic assessment of the population trend and sex ratio of the Shennongjia population of Sichuan snub-nosed monkeys (Rhinopithecus roxellana)
ZongFei Chang,ZhiJin Liu,JingYuan Yang,Ming Li,Linda Vigilant
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-011-4872-6
Abstract: Effective population management relies on assessments of population size and sex ratio. However, these estimates are difficult to obtain for elusive and rare species. Recently, noninvasive genetic census methods have been developed as an alternative to traditional capture-mark-recapture methods. In this study, we estimated the size of the Sichuan snub-nosed monkey (Rhinopithecus roxellana) population in the Shennongjia Nature Reserve (SNR) using a noninvasive sampling method based on 16 microsatellite loci. We also used a PCR-based genetic method to sex the sampled individuals and infer the population sex ratio. The population size of R. roxellana in the SNR was estimated to be 1044 individuals (95% CITIRM: 613–1409). The estimated population sex ratio is more female-biased than expected, which we attribute to the sampling biased towards one male units and limited sampling of bachelor male units. Moreover, there is no suggestion that the heavy traffic road through the reserve might block movement of monkeys. The results of this study indicate genetic assessments based on a noninvasive sampling method can provide useful information regarding populations of elusive primates.
How Inflation Affects the Management Earnings Forecasts  [PDF]
Jingyuan Zou
American Journal of Industrial and Business Management (AJIBM) , 2019, DOI: 10.4236/ajibm.2019.91003
Abstract: I use 2005-2017 Shenzhen and Shanghai’s A-share listed company’s quarterly earnings forecasts data as sample to perform multiple regression analysis. I find that when inflation rate rises, not only management’s possibility of making earnings forecasts but also the precision and accuracy of management forecasts declines, ceteris paribus. Furthermore, I also find that when inflation rate rises, the state-owned nature of enterprises will aggravate the decline in the precision and accuracy of listed companies’ earnings forecasts.
Synchronization Analysis of Two Coupled Complex Networks with Time Delays
Weigang Sun,Jingyuan Zhang,Changpin Li
Discrete Dynamics in Nature and Society , 2011, DOI: 10.1155/2011/209321
Abstract: This paper studies the synchronized motions between two complex networks with time delays, which include individual inner synchronization in each network and outer synchronization between two networks. Based on the Lyapunov stability theory and the linear matrix equality (LMI), a synchronous criterion for inner synchronization inside each network is derived. Numerical examples are given which fit the theoretical analysis. In addition, the involved numerical results show that the delays between two networks have little effect on inner synchronization. It is also shown that synchronous motions within each network or between two networks are not enhanced if individual intranetwork connections are allowed. 1. Introduction We refer to network synchronization, that is, synchronizing all the nodes inside a network, as “inner synchronization”, which is widely studied in the science world based on the appearance of small-world [1] and scale-free [2] network models. Afterwards, the improved and expanded work in this respect—that is, introducing weighted connections, time varying coupling matrices, nonlinear coupling function, time delays, and so forth—can be found in the literature [3–10] and many references cited therein. The main approaches on studying synchronization inside a network is decoupling network systems, and studying the low-dimensional systems through the master stability function, or using the tool in equality (LMI toolbox). Recently “outer synchronization” was proposed, which aimed at studying synchronization between coupled networks. In [11], the authors theoretically and numerically demonstrated the possibility of synchronization between two networks. By the open-plus-closed-loop (OPCL) method [12], synchronization between two networks can be realized with the same topological structures. In reality, if network nodes are of similar properties (same node dynamics), we regard it as one network, otherwise, as more networks. Several examples on two networks are presented in the literature [11, 13]. Actions between two networks are colorful, such as through the nonlinear signals, bipartite connection, or by special nodes. Recently, Sorrentino and Ott studied network synchronization of groups and discussed the feasibility of inner synchronization of individual network [14]. The problem of collective behavior in a network or between two networks is of broad interest. As a first example, in subway systems (e.g., Shanghai, China), when the trains arrive at the platform, the outer and inner doors simultaneously open or close, which shows that both inner
Feedforward-Feedback Hybrid Control for Magnetic Shape Memory Alloy Actuators Based on the Krasnosel'skii-Pokrovskii Model
Miaolei Zhou, Qi Zhang, Jingyuan Wang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0097086
Abstract: As a new type of smart material, magnetic shape memory alloy has the advantages of a fast response frequency and outstanding strain capability in the field of microdrive and microposition actuators. The hysteresis nonlinearity in magnetic shape memory alloy actuators, however, limits system performance and further application. Here we propose a feedforward-feedback hybrid control method to improve control precision and mitigate the effects of the hysteresis nonlinearity of magnetic shape memory alloy actuators. First, hysteresis nonlinearity compensation for the magnetic shape memory alloy actuator is implemented by establishing a feedforward controller which is an inverse hysteresis model based on Krasnosel'skii-Pokrovskii operator. Secondly, the paper employs the classical Proportion Integration Differentiation feedback control with feedforward control to comprise the hybrid control system, and for further enhancing the adaptive performance of the system and improving the control accuracy, the Radial Basis Function neural network self-tuning Proportion Integration Differentiation feedback control replaces the classical Proportion Integration Differentiation feedback control. Utilizing self-learning ability of the Radial Basis Function neural network obtains Jacobian information of magnetic shape memory alloy actuator for the on-line adjustment of parameters in Proportion Integration Differentiation controller. Finally, simulation results show that the hybrid control method proposed in this paper can greatly improve the control precision of magnetic shape memory alloy actuator and the maximum tracking error is reduced from 1.1% in the open-loop system to 0.43% in the hybrid control system.
Hybrid Group IV Nanophotonic Structures Incorporating Diamond Silicon-Vacancy Color Centers
Jingyuan Linda Zhang,Hitoshi Ishiwata,Thomas M. Babinec,Marina Radulaski,Kai Müller,Konstantinos G. Lagoudakis,Constantin Dory,Jeremy Dahl,Robert Edgington,Veronique Soulière,Gabriel Ferro,Andrey A. Fokin,Peter R. Schreiner,Zhi-Xun Shen,Nicholas A. Melosh,Jelena Vu?kovi?
Physics , 2015,
Abstract: We demonstrate a new approach for engineering group IV semiconductor-based quantum photonic structures containing negatively charged silicon-vacancy (SiV$^-$) color centers in diamond as quantum emitters. Hybrid SiC/diamond structures are realized by combining the growth of nanoand micro-diamonds on silicon carbide (3C or 4H polytype) substrates, with the subsequent use of these diamond crystals as a hard mask for pattern transfer. SiV$^-$ color centers are incorporated in diamond during its synthesis from molecular diamond seeds (diamondoids), with no need for ionimplantation or annealing. We show that the same growth technique can be used to grow a diamond layer controllably doped with SiV$^-$ on top of a high purity bulk diamond, in which we subsequently fabricate nanopillar arrays containing high quality SiV$^-$ centers. Scanning confocal photoluminescence measurements reveal optically active SiV$^-$ lines both at room temperature and low temperature (5 K) from all fabricated structures, and, in particular, very narrow linewidths and small inhomogeneous broadening of SiV$^-$ lines from all-diamond nano-pillar arrays, which is a critical requirement for quantum computation. At low temperatures (5 K) we observe in these structures the signature typical of SiV$^-$ centers in bulk diamond, consistent with a double lambda. These results indicate that high quality color centers can be incorporated into nanophotonic structures synthetically with properties equivalent to those in bulk diamond, thereby opening opportunities for applications in classical and quantum information processing.
Reverse atom transfer radical polymerization of styrene in emulsion initiated by AIBN or V50
Kai Zhang,Hongwen Zhang,Hongtu Li,Jingyuan Wang
Chinese Science Bulletin , 2005, DOI: 10.1360/982004-551
Abstract: Reverse atom transfer radical polymerization of styrene was conducted in emulsion by using Cu(II)/2,2′bipydine or Cu(II)/phen complexes, AIBN or V50 as the initiator, Brij-98 or OP-10 as the surfactant. The results of GPC showed that both polymerization processes exhibit living characters when using AIBN as the initiator. However, when V50 was used, the monomer conversion was fairly low and the whole polymerization was not controlled well. The measurement of particle size and its distribution told us that the latex particles were mean and stable when using Brij-98 as the surfactant.
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