Pub Date : 2014-01-01DOI: 10.6041/J.ISSN.1000-1298.2014.03.027
L. Yuhuan, Wang Yingkuan, Wang Yunpu, Yang Huan, W. Xiaodan, Ruan Rongsheng
{"title":"Development of downstream processing technology for microalgae biofuel.","authors":"L. Yuhuan, Wang Yingkuan, Wang Yunpu, Yang Huan, W. Xiaodan, Ruan Rongsheng","doi":"10.6041/J.ISSN.1000-1298.2014.03.027","DOIUrl":"https://doi.org/10.6041/J.ISSN.1000-1298.2014.03.027","url":null,"abstract":"","PeriodicalId":35080,"journal":{"name":"农业机械学报","volume":"21 1","pages":"158-167"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86890533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.6041/J.ISSN.1000-1298.2013.12.042
Hu Yongguang, Zhu Xiaolan, Zhao Menglong, R. Snyder, L. Pingping
Frost protection effect experiments in tea fields were conducted according to wind machine operation timing on different time scales. The treatments of starting to use wind machines before tea sprouting,starting before frost occurrence and stopping after sunrise were set up respectively. And the impact of wind machine operation on the growth of tea trees,temperature rise in the canopy and protection coverage was measured. The results indicated that starting to use wind machines 20 d,15 d and 7 d before tea sprouting increased the length of young shoot,bud density and 100-bud weight by over 20% compared with the control test; Starting wind machines 2. 0 h,1. 5 h and 1. 0 h before frost occurrenceled to better protection and enlarged the coverage radius by more than 60% compared with the control test. Delayed stopping of wind machines by 2. 0 h,1. 5 h and 1. 0 h after sunrise reduced the temperature rise of the canopy by 45. 76% in the first hour,and narrowed the reduction of the photosynthetic intensity of tea leaves. Therefore,to protect tea trees from late frost cold for better growth and yield,the appropriate application of wind machines should be more than 7 d prior to the tea budding, and the operation timing of starting and stopping for a certain frost event should be 1. 0 h before frost occurrence and 1. 0 h after sunrise,respectively.
{"title":"Operation effects of wind machines for frost protection of tea trees on different time scales","authors":"Hu Yongguang, Zhu Xiaolan, Zhao Menglong, R. Snyder, L. Pingping","doi":"10.6041/J.ISSN.1000-1298.2013.12.042","DOIUrl":"https://doi.org/10.6041/J.ISSN.1000-1298.2013.12.042","url":null,"abstract":"Frost protection effect experiments in tea fields were conducted according to wind machine operation timing on different time scales. The treatments of starting to use wind machines before tea sprouting,starting before frost occurrence and stopping after sunrise were set up respectively. And the impact of wind machine operation on the growth of tea trees,temperature rise in the canopy and protection coverage was measured. The results indicated that starting to use wind machines 20 d,15 d and 7 d before tea sprouting increased the length of young shoot,bud density and 100-bud weight by over 20% compared with the control test; Starting wind machines 2. 0 h,1. 5 h and 1. 0 h before frost occurrenceled to better protection and enlarged the coverage radius by more than 60% compared with the control test. Delayed stopping of wind machines by 2. 0 h,1. 5 h and 1. 0 h after sunrise reduced the temperature rise of the canopy by 45. 76% in the first hour,and narrowed the reduction of the photosynthetic intensity of tea leaves. Therefore,to protect tea trees from late frost cold for better growth and yield,the appropriate application of wind machines should be more than 7 d prior to the tea budding, and the operation timing of starting and stopping for a certain frost event should be 1. 0 h before frost occurrence and 1. 0 h after sunrise,respectively.","PeriodicalId":35080,"journal":{"name":"农业机械学报","volume":"24 1","pages":"252-257"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82390199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.6041/J.ISSN.1000-1298.2013.03.014
Sun-sheng Yang, Qiang Li, Zhipan Huang, F. Kong, Haixia Shi
{"title":"Research on different specific speed pumps used as turbines","authors":"Sun-sheng Yang, Qiang Li, Zhipan Huang, F. Kong, Haixia Shi","doi":"10.6041/J.ISSN.1000-1298.2013.03.014","DOIUrl":"https://doi.org/10.6041/J.ISSN.1000-1298.2013.03.014","url":null,"abstract":"","PeriodicalId":35080,"journal":{"name":"农业机械学报","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82510838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-08-01DOI: 10.6041/J.ISSN.1000-1298.2012.08.021
L. Yuhuan, Wang Yingkuan, R. Ruan, Liu Ziling, Lin Xiang-yang, Liu Chengmei
{"title":"Optimization of processing parameters for rapid liquefaction of corn stover under atmospheric pressure.","authors":"L. Yuhuan, Wang Yingkuan, R. Ruan, Liu Ziling, Lin Xiang-yang, Liu Chengmei","doi":"10.6041/J.ISSN.1000-1298.2012.08.021","DOIUrl":"https://doi.org/10.6041/J.ISSN.1000-1298.2012.08.021","url":null,"abstract":"","PeriodicalId":35080,"journal":{"name":"农业机械学报","volume":"22 1","pages":"110-115"},"PeriodicalIF":0.0,"publicationDate":"2012-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90950770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-01DOI: 10.6041/J.ISSN.1000-1298.2012.04.023
W. Lijun, Wu Min, Wang Yong, Shi Cong, Li Dong
{"title":"Rheological properties of extruded okara-maize blend based on extrusion technology.","authors":"W. Lijun, Wu Min, Wang Yong, Shi Cong, Li Dong","doi":"10.6041/J.ISSN.1000-1298.2012.04.023","DOIUrl":"https://doi.org/10.6041/J.ISSN.1000-1298.2012.04.023","url":null,"abstract":"","PeriodicalId":35080,"journal":{"name":"农业机械学报","volume":"44 1","pages":"119-125"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90934988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-01-01DOI: 10.6041/J.ISSN.1000-1298.2012.01.005
Yu Meng, Li Liu, Fei Ma, Nan Gan, X. Fu
A vision-based self-localization method was proposed for underground mining vehicle by using landmarks. Firstly, several artificial landmarks were located in a simulating tunnel, and then a vision sensor in vehicle was used to find and recognize them. After the distances between the vehicle and the recognized landmarks were calculated by a visual distance measurement method, the location of the vehicle was computed according to triangulation finally. In this self-localization method, landmarks were encoded by interleaved 2 of 5, a type of 1-D barcode with high density. Each landmark has obvious visual feature and there is a unique corresponding location data to it in the landmark database. Distance between a landmark and the vehicle was calculated on the basis of the ratio of the coding area';s actual height to its height in the image according to the pinhole imaging principle. Experimental results showed that the self-localization method suggested almost meets the requirement for autonomous driving vehicle because of its high efficiency and precision.
提出了一种基于视觉的地下矿车地标自定位方法。首先在模拟隧道中设置多个人工地标，然后利用车载视觉传感器对其进行识别。通过视觉距离测量法计算出车辆与识别地标之间的距离后，最后根据三角剖分法计算出车辆的位置。在这种自定位方法中，路标采用高密度的1-D条形码交错2 of 5进行编码。每一个地标都具有明显的视觉特征，在地标数据库中都有唯一与之相对应的位置数据。根据针孔成像原理，根据编码区域的实际高度与图像中的高度之比计算地标与车辆的距离。实验结果表明，所提出的自定位方法具有较高的效率和精度，基本满足自动驾驶汽车的要求。
{"title":"Vision-based self-localization method for underground mining vehicle","authors":"Yu Meng, Li Liu, Fei Ma, Nan Gan, X. Fu","doi":"10.6041/J.ISSN.1000-1298.2012.01.005","DOIUrl":"https://doi.org/10.6041/J.ISSN.1000-1298.2012.01.005","url":null,"abstract":"A vision-based self-localization method was proposed for underground mining vehicle by using landmarks. Firstly, several artificial landmarks were located in a simulating tunnel, and then a vision sensor in vehicle was used to find and recognize them. After the distances between the vehicle and the recognized landmarks were calculated by a visual distance measurement method, the location of the vehicle was computed according to triangulation finally. In this self-localization method, landmarks were encoded by interleaved 2 of 5, a type of 1-D barcode with high density. Each landmark has obvious visual feature and there is a unique corresponding location data to it in the landmark database. Distance between a landmark and the vehicle was calculated on the basis of the ratio of the coding area';s actual height to its height in the image according to the pinhole imaging principle. Experimental results showed that the self-localization method suggested almost meets the requirement for autonomous driving vehicle because of its high efficiency and precision.","PeriodicalId":35080,"journal":{"name":"农业机械学报","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86258043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-01-01DOI: 10.6041/J.ISSN.1000-1298.2012.05.012
Wei Li, W. Shi, Yongjuan Shen, Xiaoping Jiang, Z. Pan
{"title":"Finite element analysis of shaft strength of multi-stage centrifugal pumps based on APDL","authors":"Wei Li, W. Shi, Yongjuan Shen, Xiaoping Jiang, Z. Pan","doi":"10.6041/J.ISSN.1000-1298.2012.05.012","DOIUrl":"https://doi.org/10.6041/J.ISSN.1000-1298.2012.05.012","url":null,"abstract":"","PeriodicalId":35080,"journal":{"name":"农业机械学报","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77756542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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