最新刊期
卷 52 ， 期 5 ， 2013
- 摘要：With the development of 3D display, 3D brings people a real sort of visual experience, and it also lead to its safety problem. Visual fatigue brought by 3D display is the first safety issue. By contrast objective assignments before and after experiment, and combined with the subjective statement, the visual fatigueis varied with difference of display mode and screen disparity. The experimental results show that 2D display and 3D display have a significant difference and the polarization 3D display is not easy to cause visual fatigue. With the increase of screen disparity, visual fatigue appears as stype of growth. Started relatively flat, and then rapidly rising.关键词：visual fatigue;3D display;objective assignment
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发布时间：2023-12-11 - 摘要：Based on the Biot consolidation theory and the two layer ocean diffracted wave theory, the wave seepage forces on vertical porous circular annular cylinder resting on porous elastic seabed in two layer ocean has been investigated by applying the eigenfunction expansion approach. The analytical solutions to seepage pressure fields caused by surface wave and inner wave are given respectively and then the wave-induced lift force and overturn moment caused by the seepage pressure on the bottom of vertical porous circular annular cylinder are evaluated. The results demonstrate that the porosity of the external surface of the cylinder will lead an obvious reduction in direct wave loads on cylinder and certain reduction in seepage overturn moment on the bottom of cylinder. Inner wave-induced seepage overturn moment may be greater than that induced by surface wave. Decreasing the ratio of the cylinder's inside diameter to outside diameter will lead more obvious diminishing effect of direct wave moment than that of wave-induced overturn moment.关键词：porous circular annular cylinder;two layer ocean;wave diffraction;sea bed;wave-Induced seepage force and overturn moment
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发布时间：2023-12-11 - 摘要：TL (thermoluminescence) and OSL (optical stimulated luminescence) of mineral samples are often used to geological dating. The 3D thermoluminescence spectra of several kinds of mineral, such as quarts, potassium feldspar, sodium feldspar and mullite were measured. For the samples of quartz, the wavelengths are ranged from 350 nm to 600 nm, and mainly low temperature glow peaks are observed. The results show that luminescence intensity of quartz from Jiangxi is weaker than that from Gansu, it means that the luminescence characteristics depend on the sample region. The TL peaks of feldspar are rather complex, the wavelength is ranged from 300 nm to 750 nm, and the high temperature peaks are observed. The wavelengths of quartz and feldspar are rather broad and cover the detectable scope of the optical filter, hence quartz and feldspar can contribute more thermoluminescence in geological dating than that of mullite.关键词：quartz;feldspar;mullite;TL
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发布时间：2023-12-11 - 摘要：Since scanned images are not generated by CFA process, a part of researchers have studied scanned image forensic around sensor pattern noise. A method is proposed to contain the statistical features of the noise image and features derived from EM algorithm for the authenticity of the scanned image. This method generates a total of 63 dimensional feature classified by SVM. By analyzing the evidence effectives and testing a large number of images, the work results show that although scanned images is not generated with CFA process, scanned images also has experienced interpolation on its Fourier spectrum map. Moreover, for the purpose of distinguish between scanned images and other images (CG, DG), this method achieves the desired results.关键词：image forensic;scanned image;sensor noise;interpolation detection;EM algorithm
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发布时间：2023-12-11 -
Stochastic Traffic Assignment in Consideration of Traffic Information Based on the Link-link Penalty
摘要：A stochastic traffic assignment method considering the impact of traffic congestion information based on the direction penalty is presented to calculate the traffic flows under traffic congestion information. The travelers who are assumed to have logit style route choice behavior are divided into two groups named “stochastic users” and “information users”. The “stochastic users” are not affected by traffic information and chooses route according to the normal route impedances, while the “information users” will follow the traffic congestion information to update route impedances and their route choices are based updated impedances. A direction penalty is added to the roadroad connector to reflect the increased impedances by congestion information, a modified Dial algorithm with the consideration of direction penalty is employed for stochastic network loading of different users and method of successive average is used for stochastic traffic assignment. Two numerical examples demonstrate that the proposed method is efficient and robust, and the impacts of acceptance of traffic information and traffic information publishing strategies are discussed.关键词：traffic engineering;traffic information;stochastic traffic assignment;direction penalty;market penetration- 537
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发布时间：2023-12-11 - 摘要：Premixed gas detonation wave has a typical cellular structure, mainly using smoked technology to record the triple point trajectory of the detonation wave in the pipeline by the shear wave, incident wave and Mach stem intercourse. Detonation cell width λ acts as cellular length characteristics， detonation cell size also can be used to determine the most basic characteristic parameters of the combustible gas mixture, based on cell size, other detonation dynamic parameters, such as the critical pipeline diameter, detonation limit and direct initiation critical energy and so on all can be obtained through the simultaneous detonation cell size. Detonation cellular structure is of great significance in the study of premixed gas detonation wave propagation characteristics, different initial conditions will have some impact on the cell size; this paper studies the relationship among detonation cells size and the initial conditions through the combination of qualitative and quantitative modeling, according to the quantitative comparison with the experimental data to verify the correctness and feasibility of qualitative simulation.关键词：premixed gas;detonation;cellular structure;qualitative simulation
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发布时间：2023-12-11 - 摘要：Based on spatial multiplexing downlink MIMO-OFDM systems, a new Integrated Quantified limited feedback precoding scheme, including both quantified power distribution and quantified spatial multiplexing matrix of sub-carriers,is proposed in order to reduce the feedback bits and improving channel capacity. And the power distribution coefficients is modified. Design a low complexity non-uniform codebook quantitative methods of power allocation coefficients. The limited bits of both quantified matrix and quantified power information in part subcarriers are feedbacked to transmitter. Using an improved interpolation algorithm,the transmitter reconstructs original the optimal matrix. Simulation shows that the proposed system have improved the system capacity performance and reduced the bit error rate.关键词：spatial multiplexing;OFDM;precoding;channel capacity;quantify
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发布时间：2023-12-11 - 摘要：Using the assumption of the horizontal plane, a method of fast localization for mobile robot is presented. This method addresses an Obstacle-Ground-Corner extraction algorithm combined with the Harris-Laplace operator, fast mean shift and stereo vision, and then uses the obstacle ground corners as landmarks. The adaptive particle filtering method is used to fusion the landmarks depth and position to achieve an efficient and more accurate fast localization, the computational complexity of localization algorithm is greatly reduces due to the use of a small number of landmarks. The results of experiment illustrated the effectiveness of this method.关键词：obstacle-ground-corner;mobile robot localization;stereo vision
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发布时间：2023-12-11 -
Noether's Theorem for Variational Problem Based on Fractional Integral Extended by Sine Periodic Law
摘要：Based on the fractional integral extended by sine periodic law introduced by EI-Nabulsi, the fractional action-like Noether symmetries and conserved quantities for holonomic systems are studied. First, the fractional actionlike variational problem based on the fractional integral extended by sine periodic law is established, the fractional action-like d'Alembert-Lagrange principle is deduced, as well as the fractional action-like Euler-Lagrange equations is obtained. Secondly, the definitions and criteria of the fractional actionlike Noether's (quasi-) symmetrical transformations are presented in terms of the invariance of the fractional action-like Hamilton action under the infinitesimal transformations of group. Finally, fractional action-like Noether's theorem for holonomic systems is explored, the relationship between the Noether symmetry and the conserved quantity of the system is revealed, and two examples are given to illustrate the application of the results.关键词：fractional action-like Noether theorem;fractional integral extended by sine periodic law;fractional action-like (quasi-) symmetric transformation;conserved quantity- 612
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发布时间：2023-12-11 - 摘要：Two optimal investment problems for an insurer with two business lines are considered, where each business line's risk process is modeled by twodimensional Lévy process. It is assumed that the insurer can invest its surplus in a riskfree asset and two risky assets, where the risky assets' price processes are described by a two-dimensional Lévy process. A benchmark problem and a mean-variance problem are discussed. The first problem is to choose the optimal investment strategy to minimize the expected quadratic distance of the risk reserve to a given benchmark; the second problem is to minimize the variance of the terminal wealth when the expected terminal reserve is given. By employing stochastic dynamic programming approach, the explicit expressions of the optimal investment strategy and the optimal value function are derived for the first problem; with the results of the first problem and the duality theory, the optimal investment strategy and the efficient frontier for the second problem are derived.
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发布时间：2023-12-11 - 摘要：Let graphs Q（CkCs1Cs2…,Csk）, Q(PkCs1Cs2…,Csk) , Q(WkCs1Cs2…,Csk) be obtained from CkPkWk with every vertex vi(i=1,2,…,k)(The center vertex of Wkcan not be contained) attached one cycle Csi（i=1,2,…,k）, respectively. The highest bounds of Merrifield-Simmons indexes of Q（CkCs1Cs2…,Csk）,Q(WkCs1Cs2…,Csk) graphs are determined. The two graphs Q（CkC4C4…,C4Cs1+s2+…+sk－4(k－1)） andQ（WkC4C4…,C4Cs1+s2+…+sk－4(k－1)） which have the largest Merrifield-Simmons index of those graphs are characterized, respectively.关键词：independent set;matchings set;Merrifield-Simmons index
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发布时间：2023-12-11 - 摘要：Topic model can be used to learn the latent topic distribution. A new collaborative filtering algorithm based on dual collaborative topic regression to learn the user's latent topic distribution and the item's latent topic distribution for recommendation is proposed. On a large real-world dataset, the experiment results illustrate that the approach achieves a better performance than the state-of-the art collaborative filtering methods.关键词：recommended systems;collaborative filtering;topic model;latent Dirichlet allocation
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发布时间：2023-12-11 - 摘要：Base on GF system，an orthogonal representation algorithm for scattered data is proposed. When k=0 and k=1, GF system are Haar functions and Franklin functions respectively. A new energy model is proposed to solve this problem based on GF system. According to GF spectrum, different hierarchical surfaces could be reconstructed for scattered data. The experiments show that the method proposed is efficient and can produce pleasing results.关键词：scattered data;least square approximation;GF system
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发布时间：2023-12-11 - 摘要：Let G be a finite Abelian group, and let S be a sequence over G. A sequence S is called a splittable atom if S=(g1+g2)T for some g1g2∈G and T∈F(G) such that S∈A(G) and g1g2T∈A(G) . Suppose that G =C2⊕C2n. An exhaustive list detailing the precise structure of S is given, where S is unsplittable with length no less than n+4.关键词：finite Abelian group;Davenport's constant;zero-sum sequences;unsplittable
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发布时间：2023-12-11 - 摘要：As an effective non-linear dimension reduction method, manifold learning has attracted widespread attention and made great progress. But when sample points are not dense, these algorithms often become worse or even failed just because the points in some neighborhoods do not meet the requirement of local homeomorphism. An effective solution to this question is to increase some new interpolation points. Unfortunately, the points selected by existing interpolation methods nowadays are all linear with the original sample points. From the theory of linear algebra, the subspace spanned by the interpolation points and the original neighbors is the same as the subspace spanned by the original ones; therefore, the interpolation points will not improve the linear approximation error either. Moreover, the interpolation points have no consideration to the native structure and characteristics of the manifold, which deviates from the purpose of data dimensionality reduction. To this end, a new manifold learning algorithm based on a nonlinear interpolation method called Biharmonic is proposed. Experimental results demonstrate the improvement of the neighborhood structure. The effectiveness and stability of this algorithm are further confirmed by applying it to the classical manifold learning algorithms.关键词：manifold learning;dimensionality reduction;surface fitting;interpolation
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发布时间：2023-12-11 - 摘要：The aim of this study was to investigate the effect of dissolved oxygen (DO) on nitrifying bacterial abundance and vertical distribution in sediment of Pearl River (Guangzhou section).Vertical distributions of sediment physical-chemical properties (grain size distribution, concentrations of total organic carbon, total nitrogen, nitrate, ammonium, DO) and nitrifying bacteria abundance were characterized using sediment cores.The experiments were conducted to cultivate bacteria using local bacteria and different DO concentrations.The results showed that DO concentrations decreased from 0.26 to 0.02 mg·L-1within sediment depths of 0 to 10 cm, which was attributable to the sandy sediment and perturbation of benthic macrofauna.The nitrifying bacteria were inhibited by low DO condition, resulting in ammonium accumulation in subsurface sediment.With DO < 0.03 mg·L-1the abundance of ammonia oxidizing bacteria was greater than that of nitrite oxidizing bacteria.关键词：sediment;DO;nitrifying bacteria;vertical distribution
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发布时间：2023-12-11 - 摘要：Twelve Rhodiola compounds isolated from Tibetan different growing areas were comminuted. Their components were analyzed using headspace-gas chromatography-mass spectrometry (HS-GC-MS). The results showed the homologies and the differences existed in the relative peak area and the amount of peaks between several samples. This work provides the theoretical foundation for product development for Rhodiola from Tibetan．关键词：Rhodiola;volatile component;HS-GC-MS
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发布时间：2023-12-11 - 摘要：The time-resolved pump-probe magneto-optical Kerr technique was used to study the GdFeCo films excited by femtosecond laser. The anormalous Kerr loops were observed, owing to the fact that the sample temperature passed through the ferromagnetic compensation temperature and then caused the change of the direction of net magnetic moment. The anormalous Kerr loops, which were obtained under different pump fluence and different amount of pump pulses, were revealed contained accumulation effect from continuous pulses pump and memory effect from external magnetic field history. The origin of anomalous loops was studied in depth. The results were important to further understand the antiferromagnetic coupling property between rare earth sublattice and transition metal sub-lattice in GdFeCo and the mechanism of magnetization reversal.关键词：anormalous Kerr loops;magnetization reversal;GdFeCo;pump-probe
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发布时间：2023-12-11 - 摘要：The absorption property gasoline attached on soil matrix was studied. The relationship between peak areas and target/typical compounds of gasoline was obtained by fitting peak areas and time. The result showed that retention times of these compounds in gasoline attached on soil were different. The retention times of C5 alkylbenzene, naphthalene and methylnaphthalene were longer than those of indane and C4 alkylbenzene. In comparison, the retention times of C1，C2 and C3 alkylbenzenes were shortest.关键词：gasoline;GC-MS;volatility;fire investigation
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发布时间：2023-12-11 - 摘要：A greenhouse pot experiment and a lab germination test were carried out to determine the reproductive strategy of Rhynchelytrum repens (Willd.) C. E. Hubbard.The patterns of resource allocation in R. repens under four planting densities and the seed longevity and germination characteristics of R. repens in a 4-year period were investigated, respectively. Our results showed that: ①the total biomass, shoot biomass, root biomass and rootshoot biomass ratio of R. repens under low planting densities were significantly (p <0.05) higher than those under high planting densities, however, a contrasting pattern was observed for flower biomass; ② the values of reproductive effort of R. repens under high planting densities were significantly (p <0.05) higher than those under low planting densities, indicating that R. repens tends to allocate more resources to reproductive organs in situations of limited resources; ③ the germination rate of R. repens seeds were significantly (p<0.05) reduced by the high temperature (45 ℃), yet the relative high germination rate (30.2%) recorded at the high temperature indicated the tolerance of R. repens to high temperatures; ④the germination ability decreased significantly (p <0.05) in seeds stored for 2 years, however, the germination rate (11.1%) in seeds stored for 4 years showed that the seeds can retain their viability over a relatively long period of time; ⑤R. repens showed fast germination, specifically, the seeds began to germinate on the first day of the germination test and most of them germinated during the second or third day of the germination test. It could be concluded that R. repens as a pioneer species in many extreme environments was likely attributed to its reproduction properties revealed by this study.关键词：Rhynchelytrum repens (Willd.) C. E. Hubbard;reproductive effort;reproductive strategy;root-shoot biomass ratio;seed longevity
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发布时间：2023-12-11 - 摘要：Methylation-sensitive representational difference analysis (MS-RDA) is suitable for screening and identification of specific and low abundances genomic DNA methylation. It has been applied in many researches on mammal disease occurrence and plant developmental mechanism, but no application was reported in insects.In this study,we developed a MS-RDA method for insects,which was improved from DNA extraction, restriction enzyme digestion, amplicon preparation, and competitive hybridization. The method was further applied successfully in Sogatella furcifera (Horvath), an important rice pest in China. Four differentially methylated DNA sequences related with female and male were obtained. Three of them had been accepted by GenBank, the accession numbers were JX847621, JX624161, JX472453, respectively. Three of them were not found homologous sequences by BLAST and should be belonging to the new genes with functions unknown. Meanwhile, two differentially methylated DNA sequences related with long and short wing were obtained. Their accession numbers of GenBank were JX514031、JX472454, respectively. They were found highly similar with the 18S ribosomal or 28S ribosomal RNA gene sequences of many kinds of animals by homology analysis, therefore ribosomal RNA gene methylation maybe play some roles on wing dimorphism of S. furcifera.关键词：MS-RDA;DNA methylation;Sogatella furcifera;wing dimorphism
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发布时间：2023-12-11 - 摘要：The paper reported the establishment of a quantitative method for simultaneously determining four effective components in Compound Xueshuantong capsule by using one chemical reference, the new quality evaluation method, quantitative analysis of multicomponents by single marker(QAMS), using Ginsenoside Rg1as the internal reference substance, was developed by HPLC to simultaneously determine Notoginsenoside R1Ginsenoside Rg1Ginsenoside Re, Ginsenoside Rb1in Compound Xueshuantong capsule with the relative correction factor (RCF). In addition, the results of QAMS method were validated by comparing with that of external standard method. The results show that the RCFs have good reproducibility and no significant differences between the quantitative results of QAMS method and external standard method were observed. So, it is a accurate, convenient and practical method to simultaneously determine four effective components in Compound Xueshuantong capsule for its quality control．关键词：Compound Xueshuantong Capsule;QAMS;relative correction factor;HPLC
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发布时间：2023-12-11 - 摘要：Sample of Sogatella furcifera were collected from the rice -elds of Jingmen City, Hubei Province and their pymetrozine resistance levels were monitored by using the rice seedling dipping method in 2012. The results showed that the immigration populations had the medium level of resistance to pymetrozine (RR=16.07),while the emigration population and return migration population had the higher level of resistance. The change regularity of pymetrozine resistance levels to Sogatella furcifera from Jingmen were emigration population>return migration population > the immigration population in 2012, indicating that the pymetrozine resistance was moving forward and increasing sharply. It is urgent to perform a resistance management program.关键词：the immigration population and emigration population;pymetrozine;resistance dynamic monitoring in 2012
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发布时间：2023-12-11 - 摘要：The Chinese gymnosperm flora is with abundant diversity, ancient origin, and a lot of relict species, and endemic species, which is significant for revealing the construction of local biodiversity and characteristics. In this paper, taking the gymnosperm floras from Taiwan Mountains, Mount Wuyi, Jinggang, Wulingyuan, Emei, Eluo, and Namjagabrwa as the research objects, the authors study the composition of gymnosperm geographical elements, discuss the relationship between the floras and climatic, ecological factors. Following results were obtained: ① In the west China, it is not the floras with abundant gymnosperm species; The east mainland China, the third ladder, has more abundant gymnosperms. ② The geographical elements of genus are relative to local ecological factors, such as elevation, rainfall, quantity of heat. ③ The endemic genera to China are abundant in the east third ladder. ④ In Taiwan, the gymnosperms are with more abundant genera and species; the Abies in Namjagabrwa are more than the other 6 regions. The results from the study are important for indicating the evolution and distribution patterns of gymnosperms.关键词：gymnosperm floras;geographical elements;zonal distribution;climatic factors
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发布时间：2023-12-11 - 摘要：The 3-month standardized precipitation and evapotranspiration index was calculated based on the monthly precipitation and temperature data of 42 meterological stations in the Pearl River basin from 1951 to 2011. The Pearl River basin was divided into 5 subregions characterized by the variation of drought based on the rotated empirical orthogonal function method. The duration and intensity of drought were selected to be the characteristic variables according to the run theory, and the drought risk assessment was made across the Pearl River basin by using a multivariate regional frequency analysis approach. The five subregions divided from the Pearl River basin are all homogeneous, and the goodness-of-fit tests indicate that generalized normal and Pearson type Ⅲ distributions are best for the duration as a regional marginal distribution for different subregions,while generalized Parato distribution is best for the intensity. The Clayton copula is the best-fit regional copula for subregions one, three, and five, and the Arch13 copula is best for subregions two and four. Considering the drought return years as a risk, different districts across the Pearl River basin might suffer different drought risks. From the perspective of region, the districts of Hejiang, Guijiang, Zuojiang and Youjiang River basin will suffer a higher drought risk than others and should be caught enough attention. While from the perspective of administration, Guangxi will be the most dangerous province for all kinds of drought risks.关键词：standardized precipitation evapotranspiration index;rotated empirical orthogonal function;drought risks;multivariate regional frequency analysis;copula function;the Pearl River basin
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发布时间：2023-12-11 - 摘要：Aiming to eliminating the spatial inconsistency between the input features and reference ones, this paper proposed a method to snap input lines to reference ones based on densifying input lines. The algorithm consists of three steps: inserting auxiliary nodes, snapping nodes, and reordering snapped nodes. Inserted nodes partition input lines make it possible to accurately snap segments to reference lines. The extra adjusting step reorders the snapped nodes and thus eliminates the self-intersections on input lines. Experimental results showed that the snapped line by the new method coincided completely with the referred one in tolerance distance, and no self-intersections were found on the rectified lines, better than the results by ArcGIS software. The results proved the effectiveness of inserting auxiliary nodes and reordering the snapped nodes in this algorithm.关键词：geospatial data integration;map conflation;line snapping;spatial consistency
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发布时间：2023-12-11 - 摘要：The monthly dryness/wetness conditions were calculated by applying the Standardized Precipitation index (SPI) at the 6 month scale based on the daily precipitation records of 25 meteorological stations in Guangdong Province from 1960 to 2011. The methods including MannKendall trend test, Rotated Empirical Orthogonal Function (REOF) and wavelet analysis were employed to detect the spatial and temporal patterns of dryness/wetness conditions over Guangdong Province. The results indicate: decreasing trends of SPI are identified mainly in January, February and March, while increasing trends are dominantly concentrated in July, August and September. In the middle part of the study area, the number of months with increasing trends is more than in eastern and western parts. In addition, the eastern and coastal regions of Guangdong are characterized by increasing trends (wet tendency) of SPI in the rainy season (April to September), and the majority portion of Guangdong shows decreasing trends (dry tendency) of SPI in winter. According to the results of REOF, there are four main anomaly sub modes in Guangdong, ie., the Nanling, Leizhou Peninsula, the East and West Guangdong. All corresponding rotated principal components (RPC) of REOF indicate a wet-dry tendency in the rainy season, and all of them show a dry tendency in winter except the West Guangdong sub mode. 1.5-year and 2 to 3-year periods (significant at α=005 confidence level) can be investigated in all sub modes with the help of wavelet analysis.关键词：SPI;Mann-Kendall trend test;REOF;wavelet analysis;Guangdong province
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发布时间：2023-12-11 - 摘要：Two intense tectonic-magmatic activities during the Yanshanian have been identified in the adjacent area of Zhejiang, Jiangxi, and Anhui provinces (the WZG region). Correspondingly, there are two entirely different kinds of granites. The early Yanshanian granites are composed of granodiorite, and the rock is nearly neutral, enriched in Au, Ag, Cu, Mo, and Ni elements. The late Yanshanian granites are composed of granite porphyry, and the rock is acidic, depleted in these metallogenic elements. Therefore, the Cu, Au, Mo mineralization in the study region is related to these Yanshanian plutons. The oxygen fugacity (fO2) of the magma calculated by zircon Ce anomalies and Ti-in-zircon temperatures shows that the average magmatic fO2for the early Yanshanian granites in the study area is fayalite-magnetite-quartz (FMQ) +2.7, much higher than that of the late Yanshanian granites (FMQ -1.1). Thus, the high oxygen fugacity contributes to the formation of Cu, Au, and Mo deposits. With the popularity of the zircon analysis, it is much easier to obtain the content of rare earth elements in zircon. Using zircon trace element to calculate the oxygen fugacity tends to have a broad prospect.
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发布时间：2023-12-11
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