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| 1 | Segmentation algorithm for Hangzhou white chrysanthemums based on least squares support vector machine显示文摘In order to realize the visual positioning for Hangzhou white chrysanthemums harvesting robot in natural environment,a color image segmentation method for Hangzhou white chrysanthemum based on least squares support vector machine(LS-SVM)was proposed.Firstly,bilateral filter was used to filter the RGB channels image respectively to eliminate noise.Then the pixel-level color feature and texture feature of the image,which was used as input of LS-SVM model(classifier)and SVM model(classifier),were extracted via RGB value of image and gray level co-occurrence matrix.Finally,the color image was segmented with the trained LS-SVM model(classifier)and SVM model(classifier)separately.The experimental results showed that the trained LS-SVM model and SVM model could effectively segment the images of the Hangzhou white chrysanthemums from complicated background taken under three illumination conditions such as front-lighting,back-lighting and overshadow,with the accuracy of above 90%.When segmenting an image,the SVM algorithm required 1.3 s,while the LS-SVM algorithm proposed in this paper just needed 0.7 s,which was better than the SVM algorithm obviously.The picking experiment was carried out and the results showed that the implementation of the proposed segmentation algorithm on the picking robot could achieve 81%picking success rate. | Qinghua Yang Shaoliang Luo Chun Chang Yi Xun Guanjun Bao | 2019 | International Journal of Agricultural and Biological Engineering2019，12，4： | 3 |
| 2 | Species Diversity Based on Vertical Structure as Indicators of Artificial Restoration for Coniferous Forests in Southwest China显示文摘Five indices of species richness, species diversity and species evenness were used to assess α diversity of four types of coniferous forests undergone different artificial regeneration time. The study was based on the vertical structure of forests, involving growth-forms of total plants as well as vertical layers of woody plants. The results showed that, except for the fourth layer of woody plants, the vertical structure of the four forests exhibited significant difference in terms of their species richness, species diversity and species evenness, suggesting that α species diversity index provided more detailed information and was a better index reflecting the regeneration processes in this region. It was recommended that silvicultural management of artificially regenerated forests should be strengthened to conserve the biodiversity of the forests, optimize forest structure and, in the long run, promote sustainable development of forest ecosystems. | ZHANG Qiaoying ZHANG Yunchun Eshetu Yirdaw LUO Peng YI Shaoliang Wu Ning | 2006 | Wuhan University Journal of Natural Sciences2006，11，4： | 1 |
| 3 | Cathepsin B S-nitrosylation promotes ADAR1-mediated editing of its own mRNA transcript via an ADD1/MATR3 regulatory axis显示文摘Genetic information is generally transferred from RNA to protein according to the classic“Central Dogma”.Here,we made a striking discovery that post-translational modification of a protein specifically regulates the editing of its own mRNA.We show that S-nitrosylation of cathepsin B(CTSB)exclusively alters the adenosine-to-inosine(A-to-I)editing of its own mRNA.Mechanistically,CTSB S-nitrosylation promotes the dephosphorylation and nuclear translocation of ADD1,leading to the recruitment of MATR3 and ADAR1 to CTSB mRNA.ADAR1-mediated A-to-I RNA editing enables the binding of HuR to CTSB mRNA,resulting in increased CTSB mRNA stability and subsequently higher steady-state levels of CTSB protein.Together,we uncovered a unique feedforward mechanism of protein expression regulation mediated by the ADD1/MATR3/ADAR1 regulatory axis.Our study demonstrates a novel reverse flow of information from the post-translational modification of a protein back to the post-transcriptional regulation of its own mRNA precursor.We coined this process as“Protein-directed EDiting of its Own mRNA by ADAR1(PEDORA)”and suggest that this constitutes an additional layer of protein expression control.“PEDORA”could represent a currently hidden mechanism in eukaryotic gene expression regulation. | Zhe Lin Shuang Zhao Xuesong Li Zian Miao Jiawei Cao Yurong Chen Zhiguang Shi Jia Zhang Dongjin Wang Shaoliang Chen Liansheng Wang Aihua Gu Feng Chen Tao Yang Kangyun Sun Yi Han Liping Xie Hongshan Chen Yong Ji | 2023 | Cell Research2023，33，7： | 0 |
| 4 | Study on physical and mechanical properties of cement asphalt emulsified mortar under track slab显示文摘Purpose–During the construction process of the China Railway Track System(CRTS)I type filling layer,the nonwoven fabric bags have been used as grouting templates for cement asphalt(CA)emulsified mortar.The porous structure of nonwoven fabrics endowed the templates with breathability and water permeability.The standard requires that the volume expansion rate of CA mortar must be controlled within 1%–3%,which can generate expansion pressure to ensure that the cavities under track slabs are filled fully.However,the expansion pressure caused some of the water to seep out from the periphery of the filling bag,and it would affect the actual mix proportion of CA mortar.The differences in physical and mechanical properties between the CA mortar under track slabs and the CA mortar formed in the laboratory were studied in this paper.The relevant results could provide important methods for the research of filling layer materials for CRTS I type and other types of ballastless tracks in China.Design/methodology/approach–During the inspection of filling layer,the samples of CA mortar from different working conditions and raw materials were taken by uncovering the track slabs and drilling cores.The physical and mechanical properties of CA mortar under the filling layer of the slab were systematically analyzed by testing the electrical flux,compressive strength and density of mortar in different parts of the filling layer.Findings–In this paper,the electric flux,the physical properties and mechanical properties of different parts of CA mortar under the track slab were investigated.The results showed that the density,electric flux and compressive strength of CA mortar were affected by the composition of raw materials for dry powders and different parts of the filling layer.In addition,the electrical flux of CA mortar gradually decreased within 90 days’age.The electrical flux of samples with the thickness of 54 mm was lower than 500 C.Therefore,the impermeability and durability of CA mortar could be improved by increasing the thickness of filling layer.Besides,the results showed that the compressive strength of CA mortar increased,while the density and electric flux decreased gradually,with the prolongation of hardening time.Originality/value–During 90 days’age,the electrical flux of the CA mortar gradually decreased with the increase of specimen thickness and the electrical flux of the specimens with the thickness of 54 mm was lower than 500 C.The impermeability and durability of the CA mortar could be improved by increasing the thickness of filling layer.The proposed method can provide reference for the further development and improvement of CRTS I and CRTS II type ballastless track in China. | Tao Wang Shaoliang Wu Hengqiong Jia Shanqing Peng Haiyan Li Piyan Shao Zhao Wei Yi Shi | 2024 | Railway Sciences2024，3，2： | 0 |
| 5 | Influences of cement asphalt emulsified mortar construction on track slab geometry status显示文摘Purpose–The construction of cement asphalt(CA)emulsified mortar can obviously disturb the slab status after the fine adjustment.To decrease or eliminate the influence of CA mortar grouting on track slab geometry status,the effects of grouting funnel,slab pressing method,mortar expansion ratio,seepage ratio and grouting area on China Railway Track System Type(CRTS I)track slab geometry status were discussed in this paper.Design/methodology/approach–Combined with engineering practice,this paper studied the expansion law of filling layer mortar,the liquid level height of the filling funnel,the pressure plate device and the amount of exudation water and systematically analyzed the influence of filling layer mortar construction on the state of track slab.Relevant precautions and countermeasures were put forward.Findings–The results showed that the track slab floating values of four corners were different with the CA mortar grouting and the track slab corner near CA mortar grouting hole had the maximum floating values.The anti-floating effect of“7”shaped slab pressing device was more efficient than fixed-joint angle iron,and the slab floating value could be further decreased by increasing the amount of“7”shaped slab pressing devices.After CA mortar grouting,the track slab floating pattern had a close correlation with the expansion rate and water seepage rate of CA mortar over time and the expansion and water seepage rate of the mortar were faster when the temperature was high.Furthermore,the use of strip CA mortar filling under the rail bearing platform on bothsides could effectively reduce the float under the track slab,and it could also save mortar consumption and reduce costs.Originality/value–This study plays an important role in controlling the floating values,CA mortar dosage and the building cost of projects by grouting CA mortar at two flanks of filling space.The research results have guiding significance for the design and construction of China’s CRTS I,CRTS II and CRTS III track slab. | Tao Wang Shaoliang Wu Hengqiong Jia Zhao Wei Haiyan Li Piyan Shao Shanqing Peng Yi Shi | 2023 | Railway Sciences2023，2，4： | 0 |
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