Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： The study of vegetation dynamics and its influencing factors can reveal the response mechanismbetween vegetation cover dynamics and climate change and has important significance for regional vegetationrestoration and ecological sustainability. Based on MODIS multitemporal remote sensing satellite data, this studyinvestigated the quarterly changes in vegetation cover in the arid and semi-arid regions of Northwest China from2000-2020 using variation coefficient, Theil-Sen median trend analysis, Mann-Kendall significance test, correlationanalysis, and Hurst index. The study found that: (1) The spatial variability of the Normalized DifferenceVegetation Index (NDVI) was high in winters, and the high fluctuation areas were mainly in the grasslands andunused land areas in the Daxinganling region of Xinjiang and Inner Mongolia. (2) NDVI fluctuates more with theseasons and is most obvious in forests and cultivated areas. (3) NDVI is mainly improving, with the largestimprovement in springs (84.63%), the smallest in winters (72.52%), and the most significant improvement in thewoodland areas. (4) Surface temperature and precipitation influenced NDVI in all seasons (Significance = 0.05),with precipitation changes significantly affecting NDVI trends in summers and weakly during winters and surfacetemperature changes significantly affecting NDVI trends in springs and weakly in autumns. (5) The future NDVIalso mainly shows an improving trend, with an area of 70.89%; notably, the degraded areas are sporadicallydistributed in the Tarim and Junggar Basins of Xinjiang. This study’s results provide theoretical references forecological restoration and management in the arid and semi-arid regions of Northwest China and the response tolocal climate warming and humidification.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-10-09 Cooperative journals: 《心理学报》
Abstract： Culture has important social attributes. Previous studies have shown that adding traditional cultural attributes to a product, i.e., increasing the product's cultural load, can improve consumers' evaluations of the product. However, it is unclear how this affects brand evaluations. We infer that adding traditional cultural attributes to a product may increase the perceived social value of the product and, in turn, improve consumers' evaluations of the status of the brand to which the product belongs. Furthermore, this positive effect may be stronger for utilitarian than for hedonic products.Four behavioral studies and one brain-imaging study were conducted. Study 1 used a one-factor design with traditional cultural load (low vs. high) as the between-participant factor to examine the main effect of the traditional cultural load on brand status evaluations. Study 2 used a 2 (traditional cultural load: low vs. high) × 2 (product type: utilitarian vs. hedonic) between-participant design to assess the boundary of the main effect. Study 3a and 3b adopted a one-factor between-participant design to confirm the uniqueness of traditional culture by comparing it with modern culture (high-modern culture vs. low-traditional culture vs. high-traditional culture) and traditional Western culture (high-traditional Western culture vs. low-traditional culture vs. high-traditional Chinese culture), respectively, and also to reveal a mediating role of perceived social value. Finally, Study 4 used a one-factor within-participant design (low traditional culture load vs. high traditional culture load) to confirm the main effect and the mediating role of perceived social value again in an offline experiment. In addition, brain activations of a subset of participants in Study 4 were also measured throughout the experiment using functional near-infrared spectroscopy. The results of Study 1 showed that increasing the traditional cultural load of a product can improve the perceived status of the brand. Study 2 found the boundary of this effect. Compared to hedonic product brands, utilitarian product brands are more likely to be affected by the traditional cultural load of products. Increasing the traditional cultural load helps to increase the status of utilitarian product brands. Furthermore, the results of Study 3 and Study 4 suggested that the positive effect of product traditional cultural load on brand status is mainly due to the increase in perceived social value. Study 4b found that only in the multi-person social scenario did brain regions associated with social and reward processing show higher levels of activation. Our theoretical contribution is threefold. First, this research deepens the understanding of the traditional cultural load of products and establishes the link between the traditional cultural load of products and brand status. Second, it unravels the influence of the social attributes of traditional culture on the social value of the product, making it a key mediator in explaining the increase in brand status. Third, we reveal the limitations of using traditional culture in brand management. In addition, our research findings have important practical implications for guiding domestic brands to enhance their brand status.
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：随着我国互联网技术的飞速发展,使用新媒体进行宣传的方式已被各行各业广泛看好,从建立官方网站到使用微信公众平台,新媒体的宣传方式也在发生着转变。随着相关人员的深入研究和互联网用户的不断增多,新媒体的宣传效果也越来越好。本文新媒体时代企业该如何利用互联网+模式,将企业新闻宣传工作越做也好进行阐述,对新媒体在企业新闻宣传中发挥的作用加以分析。
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：随着科学技术的发展,广播电视进入大数据时代,广播电视等新媒体技术有了全新的发展,同时也延长了广播电视技术的生命周期。这都是对广播电视有利的一面,但是同时也存在很大的弊端,给广播电视技术带来很大的阻碍。本文针对大数据时代背景下广播电视技术的发展进行研究,并探讨如何抓住机遇,迎接挑战,带来全新的发展。
Subjects: Mechanics >> Basic Mechanics submitted time 2023-04-24 Cooperative journals: 《应用力学学报》
Abstract： In order to investigate the seakeeping performance of amphibian,the scaled model tank test method is studied.The difference of aerodynamic lift and drag between the model and amphibian is analyzed quantitatively,and a kind of constant force mechanism used to compensate air lift to the model is developed,it can modify the aerodynamic lift of model to the same as that of the aircarft.Combined with the model test,the application range,davantages and disadvantages of spectral analysis and linear reduction method used to forecast amphibian performance is analyzed.The results show that spectral analysis is an effective way only when speed lies below 90 km/h,the forecasted result at higher speed differences from the actual situation.Linear reduction method could be used at a whole rangespeed and could be used to analyze the influence of wave length and speed on motion response qualitatively,but the quantitative analysis needs further examining.
Subjects: Psychology >> Applied Psychology submitted time 2023-04-21
Abstract： Culture has important social attributes. Previous studies have shown that adding traditional cultural attributes to a product, i.e., increasing the product’s cultural load, can improve consumers’ evaluations of the product. However, it is unclear how this affects brand evaluations. We infer that adding traditional cultural attributes to a product may increase the perceived social value of the product and, in turn, improve consumers’ evaluations of the status of the brand to which the product belongs. Furthermore, this positive effect may be stronger for utilitarian than for hedonic products.
Four behavioral studies and one brain-imaging study were conducted. Study 1 used a one-factor design with traditional cultural load (low vs. high) as the between-participant factor to examine the main effect of the traditional cultural load on brand status evaluations. Study 2 used a 2 (traditional cultural load: low vs. high) × 2 (product type: utilitarian vs. hedonic) between-participant design to assess the boundary of the main effect. Study 3a and 3b adopted a one-factor between-participant design to confirm the uniqueness of traditional culture by comparing it with modern culture (high-modern culture vs. low-traditional culture vs. high-traditional culture) and traditional Western culture (high-traditional Western culture vs. low-traditional culture vs. high-traditional Chinese culture), respectively, and also to reveal a mediating role of perceived social value. Finally, Study 4 used a one-factor within-participant design (low traditional culture load vs. high traditional culture load) to confirm the main effect and the mediating role of perceived social value again in an offline experiment. In addition, brain activations of a subset of participants in Study 4 were also measured throughout the experiment using functional near-infrared spectroscopy.
The results of Study 1 showed that increasing the traditional cultural load of a product can improve the perceived status of the brand. Study 2 found the boundary of this effect. Compared to hedonic product brands, utilitarian product brands are more likely to be affected by the traditional cultural load of products. Increasing the traditional cultural load helps to increase the status of utilitarian product brands. Furthermore, the results of Study 3 and Study 4 suggested that the positive effect of product traditional cultural load on brand status is mainly due to the increase in perceived social value. Study 4b found that only in the multi-person social scenario did brain regions associated with social and reward processing show higher levels of activation.
Our theoretical contribution is threefold. First, this research deepens the understanding of the traditional cultural load of products and establishes the link between the traditional cultural load of products and brand status. Second, it unravels the influence of the social attributes of traditional culture on the social value of the product, making it a key mediator in explaining the increase in brand status. Third, we reveal the limitations of using traditional culture in brand management. In addition, our research findings have important practical implications for guiding domestic brands to enhance their brand status.
Subjects: Medicine, Pharmacy >> Clinical Medicine submitted time 2023-04-03 Cooperative journals: 《中国全科医学》
Abstract： Background With the growing incidence of metabolic diseases，there has been increasing attention given to the prevention and control of metabolic syndrome（MS）. As important screening markers of MS，the relationship between lipid ratios and metabolic syndrome has become a hot research topic. Objective To analyse the association and diagnostic value of triglyceride/high-density lipoprotein cholesterol（TG/HDL-C）ratio，total cholesterol/HDL-C（TC/HDL-C）ratio，lowdensity lipoprotein cholesterol/ HDL-C（LDL-C/HDL-C）ratio and non-HDL-C to the risk of MS in populations included in a multistage cross-sectional study in Guizhou Province. Methods This study retrospectively selected natural populations（totally 21 727 cases）from Guizhou who attended the National Survey of Chronic Diseases and Risk Factors in Surveillance Regions 2010，China Chronic Disease and Risk Factor Surveillance 2013，and two waves of China Adult Chronic Disease and Nutrition Surveillance （2015 and 2018）. Baseline data were collected，and according to MS prevalence included in which，subjects were divided into MS group（ n=4 981）and non-MS group（ n=16 746）. The receiver operating characteristic（ROC）curve analysis was used to evaluate the diagnostic value of TG/HDL-C ratio，TC/HDL-C ratio，LDL-C/HDL-C ratio and non-HDL-C for MS in males and females，respectively. The Delong test was used to compare the values of area under the ROC curve（AUC） of lipid ratios in predicting MS. Multivariate Logistic regression was used to analyze the association of lipid ratios with MS measured using odds ratio（OR）with 95% confidence interval（CI），and to identify factors associated with MS among subjects stratified by survey time，age，sex，body mass index（BMI），smoking and alcohol consumption. Results There were statistically significant differences in mean age，sex ratio，distribution of ethnicities，education level and marital status，prevalence of smoking and alcohol consumption，and mean BMI，TG/HDL-C ratio，TC/HDL-C ratio，LDL-C/HDL-C ratio and non-HDL-C between MS group and non-MS group（ P<0.05）. TG/HDL-C ratio had a higher AUC value than TC/HDL-C ratio（ Z=17.822， P<0.001），LDL-C/HDL-C ratio（ Z=23.813， P<0.001）and non-HDL-C（ Z=27.608， P<0.001）. The value of AUC of TG/HDL-C ratio was higher in males than that in females（ Z=4.299， P<0.001）. And the value of AUC of LDL-C/HDL-C ratio in males was lower than that in females（ Z=2.061， P=0.039）. Multivariate Logistic regression analysis showed that in <60 years old， ≥ 60 years old，male，female，BMI<24.0 kg/m2，BMI ≥ 24.0 kg/m2，smoking，non-smoking，drinking and non-drinking groups，TG/HDL-C ratio，TC/HDL-C ratio，LDL-C/HDL-C ratio and non-HDL-C were associated with the prevalence of MS and the associations were stronger in females，individuals with BMI<24 kg/m2，non-smokers or nondrinkers（ P<0.05）. Conclusion TG/HDL-C ratio has a good diagnostic value for MS. TG/HDL-C ratio，TC/HDL-C ratio，LDL-C/HDL-C ratio and non-HDL-C are associated factors of MS，which should be paid more attention clinically in females，individuals with BMI<24 kg/m2，non-smokers or non-drinkers.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： Plate tensile specimens were machined from a Ni- base single crystal (SC) superalloy DD33, holes with various diameters were electrochemically machined (ECM) in the middle of the specimens. The strain fields around the holes during room temperature tensile tests were in-situ observed by an ARAMIS - optical deformation analysis system based on the digital image correlation (DIC) technique and the fracture surface was observed by scanning electron microscope (SEM). It was demonstrated that the yield strength and ultimate tensile strength decreased with the increase of hole diameter from 0.5 mm to 0.9 mm. Strain concentrated in the vicinity of the hole. The maximum strain increased slightly during elastic deformation. However, once plastic deformation began, it increased rapidly above its elastic value. In addition, the maximum strain and strain gradients adjacent to the holes increased with the increase of the hole diameter from 0.5 mm to 0.9 mm. This work is critical for understanding the crack initiation around the cooling holes with different diameters in the SC blade.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： Energy storage is one of the important supporting technologies to achieve the “dual carbon” goals, and it is an important means to stabilize renewable energy fluctuations and reduce the impact of large-scale new energy access on the power grid. At present, the competition of global energy resources is becoming increasingly fierce, and China is also facing significant changes in the adjustment of energy structure. To implement the energy strategy of “four revolutions and one cooperation” in the new era, and to realize the “14th Five-Year Plan” as well as the “Long-range Objectives Through the Year 2035”, China needs to build a new system of energy structure with Chinese characteristics, driven by “clean, low-carbon, safe and efficient” energy resources. Achieving the complementary integration of clean energy and fossil energy is the key to building a new “clean, low-carbon, safe and efficient” energy system. The development of large-scale energy storage technology is not only a necessary measure for the low-carbon and clean power system, but also a powerful means to seize the strategic commanding heights of the international energy technology and ensure national energy security.
Subjects: Psychology >> Social Psychology submitted time 2023-03-27 Cooperative journals: 《心理学报》
Abstract： Affirmation and negation are two main semantic and grammatical categories in any language. The propositional theory and experiential-simulations view were proposed to explain the processing mechanism of negative sentences. Both of their supporters have supplied plenty of empirical evidence, but neither of them can beat each other. Thus, the comprehensive theories, such as dual coding theory, LASS and symbolic interdependency hypothesis have been proposed to fill the gap. In the present study, we design two eye-tracking experiments to lend further support to comprehensive theories. In the two experiments, eye-tracking technical was adopted to explore the processing mechanism of negative sentences in different semantic contexts. In Experiment 1, the alternative choices (e.g., outspread arm) presented to the participants have close semantic connection with the negated events of the sentences (e.g., the arm isn’t crooked); In Experiment 2, the alternative choices (e.g., black skirt) presented to the participants have relatively weak semantic connection with the depicted negative events (e.g., the skirt isn’t blue). In summary, ‘blue-black’ has relatively weaker semantic connection than that of ‘outspread-crook’. In these two eye-tracking experiments, voice was used to present the negative sentence, and the corresponding pictures were presented at the moment of reading the words depicting the negated state (e.g., crook/blue). And the participants’ task was to choose which picture matched the sentence. The results demonstrated that, at the early stage of processing, there was no difference between the fixation probabilities to pictures depicting the negated state of affairs (crooked arm) and their alternative (outspread arm) in experiment 1 at time window 201~600 ms. In contrast, participants had higher fixation probabilities to pictures depicting the negated state of affairs (blue skirt) than that to pictures depicting the alternatives in experiment 2 at time window 401~600 ms. Then at the later stage, participants showed higher fixation probabilities to the pictures depicting alternatives to the pictures depicting the negated state of affairs from 601 ms in experiment 1 and 801ms in the experiment 2. Besides, the fixation probabilities to the pictures depicting the negated states were lower than the random level after 1001 ms in both of the two experiments. The results from the two experiments showed that, both propositional process and simulating process are necessary when processing negative sentences. Compared with processing negative sentence in weak semantic context, it’s easier for participants to get the actual state of event with the help of strong semantic context. In addition, participants will not keep the simulation of the negated state of event in his mind, which supports suppression hypothesis. In summary, the results support the symbolic interdependency hypothesis as well as suppression hypothesis.
Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： Based on the three-dimensional basic equations of elasticity in cylindrical coordinates , the statespace method was used to solve axisymmetric problem of thick single and laminated cylindrical shells withtwo clamped ends.To satisfy strictly the boundary conditions of the clamped ends , boundary displacementfunctions introduced into the state equations as state variables , the nonhomogeneous state equations weretransformed into the homogeneous state equations by employing the dimensional expanding method , andvariable coefficient state matrixes were changed into constant coefficient matrixes with the approximatelaminate technique by dividing the layer into sub-layers.The three-dimensional basic equations of elasticityand all the boundary conditions are satisfied strictly , the exact three-dimensional analytical solutions are obtained.The results of two examples show that the present solutions obtained have high precision by com-paring with FEM (Finite Element Method) solutions , and have good constringency with the number of se-ries terms and sub-layers. In addition , the influences of thickness-radius ratio and span-radius ratio on thedistributions of the displacements and stresses of cylindrical thick shells along the radial and axial direc-tions are analyzed.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-19 Cooperative journals: 《金属学报》
Abstract： As one of the most promising next generation reactors, the molten salt breeder reactor (MSBR) with excellent inherence security has attracted more and more attentions in recent years due to energy shortage and the security problem of traditional nuclear reactor. The most significant service characteristic of the structural material used in MSBR is the existence of FLiNaK molten salt compared with other nuclear reactors. FLiNaK molten salt is very corrosive to the structural material in the reactor, and affects the safety operation of nuclear power plants. A polycrystalline Ni-Mo-Cr-Fe superalloy was developed and used as an important structural material in MSBR at Oak Ridge National Laboratory (ORNL), but the corrosion mechanism of the alloy in FLiNaK molten salt has not been determined since the study terminated in 1970' s as some politic reasons. Alloy served in harsh environments, often using protective coating to improve the corrosion properties. While few works about the coating corrosion resistance in FLiNaK molten salt were reported at present. Al2O3 and Cr2O3 coatings usually have excellent corrosion resistance in molten salt, such as sulphate, nitrate and halide molten salt. But, whether the oxide film has corrosion resistance in FLiNaK molten salt has not been determined. In this work, the corrosion mechanism of alloy in FLiNaK molten salt was studied by using immersion corrosion experiment through the method of SEM, EDS and XRD. The influence of Al2O3 coating on corrosion resistance in FLiNaK molten salt was also investigated. The results show that the Al2O3 coating does not affect the exsolution corrosion characteristics of Cr and Mo elements in FLiNaK molten salt at 700 ℃ for 400 h. The different is that naked alloy exhibits intergranular corrosion characteristic, and the alloy with Al2O3 coating exhibits spot corrosion characteristic. The Al2O3 coating cannot improve the corrosion resistance of the alloy in FLiNaK molten salt. The Al2O3 film dissolved in molten salt and resulted in the exposure of the alloy surface. The corrosion rate was increased since the formation of corrosion cell between oxide film and the exposed alloy surface.
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Other Disciplines of Agriculture, Forestry,Livestock & Aquatic Products Science submitted time 2023-02-17 Cooperative journals: 《智慧农业（中英文）》
Abstract： In order to realize the rapid and non-destructive monitoring of wheat biomass, field wheat trials were conducted based on different densities, nitrogen fertilizers and varieties, and unmanned aerial vehicle (UAV) was used to obtain RGB images in the pre-wintering stage, jointing stage, booting stage and flowering stage of wheat. The color and texture feature indices of wheat were obtained using image processing, and wheat biomass was obtained by manual field sampling in the same period. Then the relationship between different color and texture feature indices and wheat biomass was analyzed to select the suitable feature index for wheat biomass estimation. The results showed that there was a high correlation between image color index and wheat biomass in different stages, the values of r were between 0.463 and 0.911 (P<0.05). However, the correlation between image texture feature index and wheat biomass was poor, only 5 index values reached significant or extremely significant correlation level. Based on the above results, the color indices with the highest correlation to wheat biomass or the combining indices of color and texture features in different growth stages were used to construct estimation model of wheat biomass. The models were validated using independently measured biomass data, and the correlation between simulated and measured values reached the extremely significant level (P<0.01), and root mean square error (RMSE) was smaller. The R2 of color index model in the four stages were 0.538, 0.631, 0.708 and 0.464, and RMSE were 27.88, 516.99, 868.26 and 1539.81 kg/ha, respectively. The R2 of the model combined with color and texture index were 0.571, 0.658, 0.753 and 0.515, and RMSE were 25.49, 443.20, 816.25 and 1396.97 kg/ha, respectively. This indicated that the estimated results using the models were reliable and accurate. It also showed that the estimation models of wheat biomass combined with color and texture feature indices of UAV images were better than the single color index models.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-08-05 Cooperative journals: 《广西植物》
Abstract： To investigate rhizosphere soil and endophytic fungal community composition, diversity, and ecological functions in Kadsura coccinea, the endophytic fungal community from roots, stems, leaves, and rhizosphere soils of mature K. coccinea were analyzed based on highthroughput sequencing technology. The results were as follows:(1) A total of 2 241 operational taxonomic units (OTUs) were obtained from 12 samples at 97% of sequence homology level. The OTUs of endophytic and rhizosphere fungi were 1 453, 386, 536 and 258, respectively, of which 18 OTUs were in common. There belong to 10 phyla, 41 classes, 95 orders, 212 families, and 367 genera, respectively. The dominant fungal communities at the phylum level in the endophytic and rhizosphere soil of K. coccinea are Ascomycetes and Basidiomycetes. Among them, Ascomycota accounted for 96.99% and 95.37% of the endophytic fungal community in leaves and stems, respectively. At the genus level, the saprophytic fungi Mortierella accounted for a relatively high proportion (13.5%) in the rhizosphere soil, in contrast, pathogenic fungi such as Ascomycota and Mortierella were mainly found in vigorously growing tissues (leaves and stems). (2) Alpha diversity analysis showed that the richness and diversity of the fungal community in the rhizosphere soil of K. coccinea were significantly higher than those in endophytic fungi. Although the abundance of endophytic fungi in stems was significantly higher than that in roots and leaves, the differences in endophytic fungal diversity among roots, stems and leaves were not significant. The principal component analysis (PCoA) revealed that the fungal community structures of leaves and stems were more similar, and those of roots and rhizosphere soils were more similar. (3) The function of endophytic fungal communities in different tissues and rhizosphere of K. coccinea was predicted and analyzed by using FUNGuild platform. The results showed that the rhizosphere soil fungi and endophytic fungi contained a large number of unclassified fungi. Among the functionally classified fungi, the pathotroph functional group has a higher proportion in the vigorously growing tissues. This study provides a theoretical basis for the screening and exploring of active functional fungi in K. coccinea.
Subjects: Biology >> Botany >> Applied botany submitted time 2020-08-02 Cooperative journals: 《广西植物》
Abstract：为了阐明不同生态环境条件下沙生植物沙鞭的结实规律，该文对沙鞭137 个种群结实情况进行了实地观察，发现沙鞭种子的结实情况可被划分为无种子、种子饱满和种子不饱满3 种类型；在此基础上，该文采用聚类分析、Kruskal-Wallis 检验和典范对应分析（CCA）等方法探究沙鞭种群结实情况与22 个地理气候因子的相关性。结果表明：沙鞭137 个种群按照地理气候因子不同聚为3个组；Kruskal-Wallis 检验显示沙鞭3 个组间种子结实情况差异不显著（P = 0.269），即沙鞭种群间种子结实与其所处的地理气候因子无直接相关性；同时，典范对应分析（CCA）表明沙鞭种群间种子结实情况差异也不显著（P > 0.05），但地理气候因子与种子饱满度以及无种子特征具有显著相关性，其中海拔和降雨因子（bio12-bio19）与种子饱满度呈正相关，经纬度和温度因子（bio4，bio7）与种子饱满度呈负相关，而无种子特征仅与最湿季平均温度（bio8）呈正相关。地理气候因子对沙鞭天然种群有性繁殖（有种子）重要性高于无性繁殖（无种子），表明制约沙生植物沙鞭有性繁殖的环境因子复杂，其无性繁殖可能是种群数量稳定的适应性表现。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-20 Cooperative journals: 《计算机应用研究》
Abstract： Texture similarity calculation is one of the basic methods of big-data analysis and data mining. For solving the problem that the existing texture features are not strong for color image discrimination, a texture similarity calculation method with improved local binary pattern features is proposed. This method proposes three modes for feature fusion, including extreme mode, addition mode and encoding mode. The LBP features acquired on the three channels of H, S and V of color image are fused by these modes to obtain the texture description of color image. The fusion operation is carried out in three stages including LBP calculation of neighborhood pixels, LBP calculation of central pixels, and histogram feature extraction, to improve the ability of feature discrimination. The results of texture similarity experiments on VisTex texture database show that, the false acceptance rate, flase rejection rate and equal error rate of this method are obviously lower than those of methods described in references [7, 8, 9].
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-18 Cooperative journals: 《计算机应用研究》
Abstract： In order to meet the needs of the network under the background of big data, and eliminate inferior data interference data knowledge high precision requirements of large data transmission, variable size adjustment scheme based on the algorithm to expand the network of large data knowledge opportunistic scheduling is proposed. Based on the analysis of large data network characteristics, the adaptive vector encoding, capture the heterogeneous characteristics of large data network, using multi order back-propagation network of heterogeneous data is normalized, and then through the real-time transmission of large data network to achieve opportunistic scheduling. At the same time, the knowledge engineering system composed of network data segmentation of fine-grained big data based on the multidimensional feature dimension, the granularity of knowledge transformation is known, then adjust the size of the dynamic characteristics, making big data set of knowledge engineering with linear characteristics and clear geometric characteristics, improve the accuracy of knowledge acquisition through knowledge expansion. The experimental results are compared with the algorithm based on fine grained knowledge acquisition, which proves the high reliability, real time and high efficiency of network data transmission.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2017-02-08 Cooperative journals: 《中国科学院院刊》
Abstract：科技评价是科学共同体内部自治的一项基本制度，是衡量科技创新活动及其主体水平和价值的主要依据，也是新时期我国科技体制改革的突破口。为加强战略性先导科技专项（简称“先导专项”）管理，推动重大成果产出，2013年5月，中科院明确由发展规划局（简称“规划局”）负责先导专项的中期检查和结题验收，同时支撑院学术委员会做好先导专项立项咨询评议。规划局组织开展的上述科技评价工作，为中科院党组对先导专项的科学部署及动态调整提供了重要参考和决策支撑。
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-14 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：为了研究钢箱梁防腐涂层腐蚀损伤演化规律，预测其防腐寿命，加工制作钢板试样，表面喷涂电弧喷铝外加环氧封闭漆防腐涂层，进行室内加速腐蚀试验。通过扫描仪采集不同试验周期防腐涂层腐蚀形貌图像，观测腐蚀发展过程。采用基于二值化图像的图像处理技术提取腐蚀形貌图像特征参数，作为腐蚀寿命预测参数，并结合特征参数评定涂层腐蚀损伤程度。研究结果表明，基于二值化图像的图像处理技术可以实现防腐涂层腐蚀面积定量化分析，为防腐涂层腐蚀等级评定和腐蚀损伤规律表征提供了新的思路；封闭漆防腐涂层经过598h的室内加速腐蚀试验，起泡面积率达到5%，该层涂层失效。
Hits
Hits
Downloads
Comment
YES