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关于农民工歧视问题的探析 总被引：1，自引：0，他引：1
农民工为城市的建设和发展做出了巨大贡献,但农民工受歧视的问题却十分突出,解决好农民工歧视问题是建设和谐社会的必然要求。阐述了农民工歧视的主要表现,分析了受歧视的主要原因,并提出了解决的建议。 相似文献
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Piotr Zapotoczny 《Journal of Cereal Science》2011,54(1):60-68
The development of non-destructive methods for the evaluation of cereal grain varieties has important implications for the food processing industry. The described experiment investigated 11 varieties of spring and winter wheat of different quality class. The analysis was performed on images acquired from a flatbed scanner interfaced to a PC. Kernel images were digitalized at high resolution (2673 × 4031) with 24-bit depth and 400 dpi. The variables input into the statistical model were the textures of single kernel projections. Textures were computed separately for seven channels (R, G, B, Y, S, U, V). The results were examined with the application of discriminant analysis and neural networks. The accuracy of texture-based classification of 11 wheat varieties reached 100%. The experimental design which yielded the most satisfactory results comprised texture measurements from the combined area of 20 kernels and variables from seven channels input into the neural network. The final classification quality was not affected by the year of cultivation, moisture content or grain variety. 相似文献
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Horses were tested for recognition of objects under various rotations to better understand how they perceive stimuli. Four horses learned to discriminate positive and negative stimuli for three sets of “real-life” three-dimensional objects always presented in one particular orientation (front to left, top up). When the horses reliably performed at an above chance criterion of 80% correct responses for two consecutive runs of 20 trials (P = .0046), the objects were rotated in depth and/or turned upside down, for example, front to right, top to horse; back to horse, bottom up. Overall performance on rotated trials, as well as Trial 1 scores on novel presentations, indicated that the horses were capable of recognizing objects under all rotational conditions. However, there was a degree of individual variation, with some horses performing better than others on certain rotations. Moreover, objects rotated in certain positions were more easily recognized than others. The most significant effect was seen when rotations with the top of the objects visible were compared with those with the bottom visible—the former being more recognizable than the latter. This suggests that the horses were using certain features of the objects on which to base their decisions. These findings provide new information on object perception in horses and address one common belief about why horses startle at objects that should be familiar to them. 相似文献
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蒲苇、花叶芦竹和芦苇是目前国内园林应用较为广泛的观赏草。由于同科,生物学特征有许多相似之处,加之科普认知、市场误导等的影响,使3者在行业内外造成了名实混淆的现象。该文通过文献查阅和实践调查,认为"银芦"、"意大利芦苇"应归始正名为蒲苇和花叶芦竹。 相似文献
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本实验通过加注氢氧化钠试液 ,氧化钡试液等方法 ,鉴别冰片的真伪 ,结果表明这些方法简便可靠 ,具有一定的实用性 相似文献
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JianLI NaiyinXU 《农业科学与技术》2014,(8):1277-1280
[Objective] This study was to evaluate the high yielding and stability of candidate cultivars, depict the adaptive planting region, analyze trial location discrimination ability and representativeness, as well as identify the ideal cultivar and trial location, with the aim to provide theory background for cultivar selection and reasonable scheme of test location in Jiangsu Province. [Method] The GGE biplot method was used to analyze the lint cotton yield of 12 experimental genotypes in the 6 test locations(three replicates in each) of the cotton regional trial in Jiangsu Province in 2013. [Result] The effects of genotype(G), environment(E), and genotype by environment interaction(G×E) on lint cotton yield were all highly significant(P0.01), which made it necessary to further explore the specific pattern of genotype by environment interaction. Jinmian118(G4) and SF3303(G5) were the best ideal genotypes screened by the "ideal cultivar" and "ideal location" view of GGE biplot, and the ordination of test sites based on the ideal index were in the order of Dafeng(DF), Yanliang(YL), Liuhe(LH), Dongtai(DT), Yancheng(YC), and Nantong(NT), among which NT was relatively weak in representing of the whole target cotton planting region in Jiangsu Province. The "similarity among locations" view of GGE biplot clustered all trial locations into one group, showing that the test sites in the cotton planting region in Jiangsu Province were in the same mega-environment.The "which-won-where" view of GGE biplot indicated that cotton cultivar Jinmian118(G4) was the most appropriate cultivar in the homogeneous cotton planting region in Jiangsu Province. [Conclusion] Among the candidate cultivars, Jinmian118 and SF3303 were identified as the most ideal cultivars in this set of conventional cotton regional trial in Jiangsu Province; the test site of Dafeng ranked the first out of all locations in terms of discrimination and representativeness, and all test locations were clustered into the same mega-environmet, which indicated the high efficiency of cultivar selection in the cotton regional trial in Jiangsu Province. 相似文献
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Discrimination of 24 wild tea germplasm resources ( Camellia sp. ) using RAPD markers was conducted. The result showed that RAPD markers were very effective tool and method in wild tea germplasm discrimination. There were 3 independent ways to discriminate tea germplasms, a) unique RAPD markers, b)specific band patterns and c) a combination of the band patterns or DNA fingerprinting provided by different primers. The presence of 16 unique RAPD markers and the absence of 3 unique markers obtained from 12 primers made it possible to discriminate 14 germplasms. Using the unique band patterns of primer OPO-13 could discriminate 10 tea germplasms. It was of much importance using minimum primers to obtain maximum discrimination capacity. All the 24 wild tea germplasms could be discriminated easily and entirely by the band patterns combination or DNA fingerprinting obtained from OPO-13, OPO-18, OPG-12 and OPA-13, including two wild tea trees of very similar morphological characteristics and chemical components. 相似文献