最新刊期
卷 57 ， 期 4 ， 2018
- 摘要：In order to give consideration to the copyright protection and content authentication of vector geographic data, and ensure the accuracy of data, a multiple watermarking algorithm is proposed, which has no effect on the data accuracy and includes zero-watermarking and fragile watermarking. Based on vector element nodes, the algorithm divides the vector geographic data into different degrees of blocks by point constraint according to requirements. A large capacity zero-watermarking algorithm with two main processes is put forward to protest the copyright of data, The Douglas algorithm and the Delaunay triangulation network are adopted to extract feature points and feature information from the data, and then the watermarking image scrambled by Arnold algorithm does xor with the feature information. By spatial sorting and zero-bit dynamic expansion, a non-destructive embedded fragile watermarking algorithm is used to authenticate data content. The experimental results show that the zero-watermarking algorithm can resist robustly against the common map attacks and combination attacks; the fragile watermarking algorithm can effectively achieve accurate authentication and accurately locate and mark the modified elements.关键词：vector geographic data;multiple watermarking;zero-watermarking;fragile watermarking;non-destructive embedded
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发布时间：2023-12-11 - 摘要：The health of land use system is closely related to city's social and economic development, ecological environment and human life, and has an important influence on the sustainable utilization of land resources. In this paper, literature data, analytic hierarchy process, and multi index comprehensive evaluation model were used to dynamically diagnose and evaluate health status of land use system in Guangzhou during 2001 to 2012. The conclusions are as follows: Overall health level of land use system in Guangzhou during 2001 to 2012 was continuously improved. System health index increased from 0.26 to 0.70 with a progress of “unhealthy-critical state-sub health”. The land use system health pressure index rose slightly and state index and response index showed an upward trend. The growth rate of fixed asset investment, land average GDP, per capita arable land area, forest coverage, and land market allocation degree are critical factors of land use system healthy level.关键词：PSR model;health evaluation;analytic hierarchy process;comprehensive index method;Guangzhou
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发布时间：2023-12-11 - 摘要：In order to evaluate the performance of boundary layer (BL) schemes on wind prediction in western Inner Mongolia, seven hindcasting simulation experiments are conducted with different boundary layer parameterization configurations in Weather Research Forecast(WRF). Observations from 70 national stations and 18 wind towers are used as the reference of the evaluations. The results are shown as follows: The variability of wind field can be captured in the numerical simulations. There exists a slightly clockwise deviation in the directions of 10 m and 70 m wind fields in all simulation experiments. The performance of BL schemes on 3~15 m/s wind field is superior to those on 15~25 m/s, while poor simulation results are presented on 0~5 m/s wind field. The diurnal variation of wind speed and direction can be described in all BL schemes, as corroborated by an increasing wind speed and a clockwise rotating wind direction during the daytime and a decreasing wind speed and a counterclockwise rotating wind direction during the nocturnal time. The differences of BL scheme experiments on 10 m wind field are more obvious than those on 70 m wind field, with a larger overestimation in the amplitude of wind. The YSU works best at 10 m wind speed, and ACM2 performs better at 70 m wind speed. The TEMF, YSU and ACM2 are more effective for prediction of wind shear. The atmospheric stability is of vital importance for the simulation of low-level wind field.关键词：Western Inner Mongolia;Wind power;Wind forecast;Boundary layer parameterization;WRF
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发布时间：2023-12-11 - 摘要：Based on the continuous monitoring data of O3and PM2.5from air monitoring stations during 2013-2015, characteristics of complex pollution with high PM2.5and O3concentrations were studied over the Pearl River Delta (PRD) area. The results are shown as follows: The hourly variation of PM2.5concentration was negatively related to that of O3concentrations, so the superimposed pollution rarely happened simultaneously. However, the daily-average concentrations of PM2.5and O3usually exceed the concentration limits of national standard. Complex pollution occurred most frequently in October, rarely in May, and most frequently in Zhaoqing, followed by Guangzhou and Foshan. The weather conditions that caused complex pollution in the Pearl River Delta include continental cold high, tropical cyclones, denatured high, subtropical high and troughs, in which the continental cold high pollution accounted for 49.4% and the tropical cyclones pollution accounted for 21.9%.关键词：the Pearl River Delta;complex pollution;PM2.5;O3;synoptic pattern
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发布时间：2023-12-11 - 摘要：Haxiyatu iron-polymetallic deposit, a typical Triassic skarn deposit, is located in the tectonic belt of East Kunlun. To make clear of the metallogenic materials, this paper used oxygen, sulfur, lead isotope to trace magnetite, pyrite and sphalerite. The δ18O value of magnetite was2.7‰~4.1‰, which indicated that the atmospheric precipitation was included in the metallogenic fluid except the magma water The δ34S value of pyrite and sphalerite was .63‰~6.30‰ and the total sulfur value was 3.77‰, which meaned that the sulfur in the mine may originate from the mixed magma of the crust-mantle. The lead isotope change of pyrite was smaller, for example, the values of208Pb/204Pb、207Pb/204Pb、206Pb/204Pb were 38.471~38.629、15.627~15.671 and 18.435~18.473 respectively, which showed the crust-mantle mixing origin yet. Based on the ore-forming pluton and the regional tectonic background, it's maintained that the metallogenic material may come from the mixing magma of the crust and mantle and mix in some iron materials in the ore-forming process. The mineralization process may be as follows: the subduction slab metasomatized the mantle and a partial melting occurred. During the process of invasion, the felsic rocks (TTG) of lower crust were partially fused, and then formed the mixing magma. In the space of magmatic emplacement, the precipitate water or the stratigraphic syngenetic water infiltrated through the cracks, mixed with the quartz diorite again, making the ore-bearing hydrothermal solution metasomatized the carbonate, and finally to form the skarn deposit.关键词：Haxiyatu deposit;O-S-Pb isotopes;ore-forming material;East Kunlun
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发布时间：2023-12-11 - 摘要：There are many kinds of laser diffraction particle-size analyzers used to study the particle-size of soil sediments in recent years. The analysis results may be difficult to compare, which affects the reliability of the research conclusion to some extent. The particle-sizes of the loess, paleosol and palaeoflood slackwater deposits (SWD) were measured with Mastersizer2000 by Malvern Instruments and LS13320 by Beckm an Coulter. The repeatedly measured results of an individual sample are very good. Both of two analyzers can be used for extracting palaeoenvironmental information of soil sediments. The LS13320 by Beckm an Coulter is better than the Mastersizer2000 by Malvern Instruments in the detective effect of relatively fine and coarse particles with rather few content. Therefore, the particle size of samples should be obtained and analyzed by the same method in order to compare them with different references．关键词：MS2000;LS13320;laser diffraction particle-size analyzer;soil sediments
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发布时间：2023-12-11 - 摘要：A spectral collocation method is provided for the fractional Volterra equation with ratio delay. By variable transformation and Jacobi discretization, a rigorous convergence analysis is proposed. The conclusion that the error of the approximate solution and approximate derivative decay exponentially both in L∞space and L2ωα,βspace are obtained.关键词：spectral analysis;ratio delay;fractional order;Volterra equation
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发布时间：2023-12-11 - 摘要：A novel visual tracking method based on lazy interaction and irregular patches is proposed, to improving the accuracy and success rate of target tracking, especially on the challenges of background clutters and illumination variation. First, it divides the target into a lot of irregular target patches by using a simple and lazy interactive process, and each target patches is initialized by the kernel correlation filtering. Then, each target patches is tracked based on the kernel correlation filtering. At the same time, the proposed method updates the patches model in a simple way to satisfy the constant changes of the target and the environment. When a simple update fails to deal with the target transformation, the lazy interactive process resamples the related patches and builds a more accurate target patch model. Finally, according to the position of all the target patches on the new frame, the target position is computed by the hough-voting scheme. The main innovation is that sampling the target patches through lazy interaction ensures the effectiveness of describing target patches. And by sampling the irregular patches, it effectively describes the target characteristics. Using the 27 videos of visual tracking benchmark, the quantitative evaluation of different trackers is achieved. Many experiments demonstrate that the proposed method perform is better in dealing with target illumination variation, rotation, background clutters and so on.关键词：visual tracking;irregular patch;lazy interaction sampling;kernel correlation filtering;hough-voting
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发布时间：2023-12-11 - 摘要：Perfect matching counting problems of graph has been proven to be NP-hard, so to get the number of perfectly matched general graph is very difficult. The issue has important applications in quantum chemistry, crystal physics and computer science. Research on this issue has very important theoretical and practical significance. The counting formula of the perfect matching for graphs 2-nD42-nC6,3and 3-nC6is given by applying differentiation, summation and re-recursion. Many graphs of the number of all perfect matchings can be calculated by this method. The given method also is able to get the possibility that the perfect graphs match with the counting of all perfect matching.关键词：perfect matching;linear recurrence relation;characteristic equation;general solution
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发布时间：2023-12-11 - 摘要：A recursive backtracking algorithm is designed, which uses the algorithm optimization strategy combined with pruning and prejudging function. It achieves the graceful verification for any graphs within finite points. Using this algorithm, the gracefulness of all the simple connected graphs are verifying in 9 points, and the number of all the graceful and ungraceful graphs is obtained in this range. the results show that the vast majority of the graphs are graceful in this range. And according to the experimental data, the following conclusions are also shown: a definite lower bound of graph Kn-m (a graph of complete graph minusmedges) is ungraceful; whenpandqsatisfy certain conditions, all of this kind of (p,q）graphs (pis the number of vertex, andqis the number of edges) are graceful; whenq(mod 4)={0,3}, andq≤［3.7p-9.3, almost all of this kind of (p,q) graphs are graceful. And further guess, whenp>9, the relevant conclusions are rational.关键词：graceful labeling;graceful graph;ungraceful graphs;graceful space;algorithm
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发布时间：2023-12-11 - 摘要：The weak well-posedness is obtained for the Cauchy problem of the Degasperis-Procesi equation with the initial valueu0∈H1(R)∩W1，∞(R). At first，by introducing the characteristics，the Cauchy problem of the Degasperis-Procesi equation is transformed into an ODE system. By using the ODE theory，the local existence and uniqueness of the solution to the ODE system is proved. Finally，the unique solution is investigated for the original equation by the relationship between the original equation and the ODE system，and the weak continuous dependence on initial conditions to the original equation is given.关键词：Degasperis-Procesi equation;weak well-posedness;characteristics;weak continuous dependence
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发布时间：2023-12-11 - 摘要：The return levels of the joint distribution of flood peak discharges and flood peak water levels were analyzed by Archimedean Gumbel-Hougaard copula and Kendall distribution function in this article. Using the annual maximum flood peak discharges and corresponding flood peak water levels between years 1951 to 2010 at Gaoyao hydrologic station in Xijiang River, the ‘OR’ return period, ‘AND’ return period and Kendall return period with the most likely design quantiles were calculated. The main conclusions of this study can be summarized as follows:① The conditional probability of flood peak flow and flood water level shows various flood control design standards.② Compared with the “OR” return periods and “AND” return periods, Kendall return periods more accurately reflect the risk rate of the combination of flood elements. ③ Based on the principle of maximum probability, the calculated design quantiles of Kendall return periods under the different combination condition of flood peak flow and water level can provide more options for flood control standard selection and risk management.
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发布时间：2023-12-11 - 摘要：Adaptive bird mating optimization (BMO) algorithm based on damage identification technology is a kind of new swarm intelligence optimization method, which uses mating patterns of birds‘society, to get an optimal offspring in model, used to simulate the structure damage identification in the stiffness of the solution obtained after optimal iteration. The simply supported beam and truss example is chosen as samples using the Matlab software to simulate the design and data of the program. Compared with the traditional genetic algorithm, the finite element model of these two structures is analyzed to verify the effectiveness of the method.关键词：damage identification;BMO algorithm;finite element model
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发布时间：2023-12-11 - 摘要：In order to overcome the error introduced by single wavelength calibration, a parallel acquisition and feature extraction method is proposed for multi-feature wavelength. Based on the analysis of phase error causes, an improved Mertz method was designed for multi-spectral data acquisition. In this algorithm, the parameters in different registers of the DSP are alternated. It realizes the adjustment of the different characteristic wavelength correction parameters and suppresses the phase error caused by the zero offset. The experimental system was constructed by DSP6713, Roper's high-speed linear array CCD, static interference tool and focusing lens group. The center wavelengths of the system test laser were 632.0, 650.0 and 660.0 nm, respectively. Finally, the test results of this algorithm are compared with the experimental data. The results show that: ① Compared with the traditional calibration method, the characteristic peak is more obvious, the side lobes are smaller, and the signal-to-noise ratio is improved. ② Compared with the test data of the TENSOR-27 spectrometer, the mean of noise dropped from -30 dB to -32 dB.关键词：multispectral processing system;modified Mertz method;multi-spectral discrimination;phase calibration
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发布时间：2023-12-11 - 摘要：With the effective-mass approximation and the method of diagonalization of the Hamiltonian, the eigenvalue of energy and the eigen-wave-function of quantum dots (8 polarized electrons) have been calculated in the harmonic oscillator potential, and the clear electronic structures have been gained by the methods of one-body, two-body and three-body density functions. The electronic structures’ change is analyzed when the quantum dot is doped (adding one positive or negative electron). The results show that positive doping increases the aggregation of the central charge of the quantum dots, while the negative dopant forms the charge void at the center.关键词：quantum dot;charge density;doping;electronic structures
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发布时间：2023-12-11 - 关键词：silver nanowires;silver paste;solar cell;conductivity property;tensile property
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发布时间：2023-12-11 - 摘要：The Surflex-Dock method was adopted to predict the compound-protein target association between Danhong Injection (DHI) components and anti-thrombotic activity related targets. The Cytoscape software was used to construct the DHI compound-target network, and the ClueGO plugin was used to analyze the signaling pathway of the targets. Through virtual screening, 2 028 interactions between 60 DHI components and 106 anti-thrombotic targets were obtained, and the compound-target network of DHI was established. The targets closely associated DHI components including F2, F13A, SERPINC1, PGH2, ACE, REN, PLAU and PROC，which were involved in the blood coagulation, fibrinolysis, endothelial function, vasoconstriction/dilation systems. The salvianolic acids showed more associations with anti-thrombotic targets indicating that they might be the main anti-thrombotic activity components in DHI. This study provides a basis for the further study of the multi-component and multi-target molecular mechanism of DHI.关键词：Danhong Injection;molecular docking;anti-thrombotic;component;target
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发布时间：2023-12-11 - 摘要：To study the inhibitory effects of ethanol extract ofDesmodium microphyllumonDeinagkistrodon acutusvenom. The venom was incubated with the ethanol extract at different ratios at 37 ℃ for 30 min, the inhibitory effects of the extract on major enzymes activities ofD. acutusvenom were then measured in vitro and the neutralizing capacities to the venom were evaluated in vivo. The activities of proteolytic enzyme, phospholipase A2hyaluronidase and fibrinogenolytic enzyme were inhibited significantly, and the activities of hemorrhage, edema and tissue necrosis as well as lethal potency were neutralized obviously, all of which presented inhibitory effects in a dose-dependent manner. The study showed for the first time that the activities ofD. acutusvenom could be inhibited by the extract fromD. microphyllumwhich provided a theoretical basis for the application ofD. microphyllumin the treatment of snakebite.
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发布时间：2023-12-11 - 摘要：In order to better understand the roles of carboxylesterase (CarE) genes in development and response to CO2exposure in the cigarette beetle,Lasioderma serricornewe identified and cloned two full-length cDNAs of CarE genes using transcriptome data and RT-PCR technique. We analyzed their molecular characterization and phylogenetic relationship, and detected their expression profiles in different developmental stages and under different CO2stress conditions by using quantitative real-time PCR (qPCR). The open reading frames of two genes were 1 698 bp and 1 695 bp, encoding proteins comprised of 565 and 564 amino acid residues, respectively. The amino acid sequence homology and phylogenetic tree analysis indicated that both of them have typical conserved motifs of CarE protein and belong to β subfamily, and termed asLsCarEB1andLsCarEB2(GenBank accession no: MG189601 and MG189602), respectively. The qPCR results showed that two genes were both expressed in all tested developmental stages, and the relative mRNA expression levels were significantly higher in lately larvae than those in early larvae, pupae and adults. InL. serricornelarvae exposed to CO2for 6 h, the mRNA levels of 〖LsCarEB1andLsCarEB2were significantly increased at different dose treatments compared to that of the control. We speculated thatLsCarEB1andLsCarEB2may be involved in development and play important roles in response to CO2stress inL. serricorne.关键词：Lasioderma serricorne;carboxylesterase;cloning;expression pattern;CO2stress
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发布时间：2023-12-11 - 摘要：A SPR method was established to determine the specific binding constants of CD45-FITC to protein A. The specific binding of CD45-FITC was monitored in real time on the SR7500DC Dual Channel System. The characteristic constants for this reaction they were association rate constantkadissociation rate constantkdassociation equilibrium constantKaactivation energyEaand enthalpy change △H. The results indicated that the optimum reaction conditions were under neutral or alkaline medium, with a slightly higher ionic strength and temperature. This method has the characteristics of being fast, simple operation, high sensitivity and less sample, which can be suitable for the investigation of biomolecular interactions of immunoglobulin IgG with protein A.关键词：surface plasmon resonance(SPR);CD45-FITC;protein A;specificity binding constants
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发布时间：2023-12-11
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