虫害是造成农作物减质减产的最主要原因,引入新一代信息技术可以及时有效防治虫害。本文基于农业物联网(Internet of Agriculture,IOA)技术与YOLOX-s目标检测算法设计并搭建了一套农作物虫害监测系统。系统整体框架由信息感知层、信息...虫害是造成农作物减质减产的最主要原因,引入新一代信息技术可以及时有效防治虫害。本文基于农业物联网(Internet of Agriculture,IOA)技术与YOLOX-s目标检测算法设计并搭建了一套农作物虫害监测系统。系统整体框架由信息感知层、信息传输层、信息服务层和系统应用层组成,选用YOLOX-s目标检测算法实现虫害识别功能。实验结果表明,该算法提高了农作物虫害监测的识别准确率。本文所研究的系统有助于农作物虫害防治工作,为智能化虫害防治提供重要参考。展开更多
Asymmetric hybrids between Gossypium hirsutum (YZ-1) and G. davidsonii were obtained by donor-recipient fusion. YZ-1 was considered the recipient and was pretreated with iodoacetamide (IOA), while G. davidsonii was co...Asymmetric hybrids between Gossypium hirsutum (YZ-1) and G. davidsonii were obtained by donor-recipient fusion. YZ-1 was considered the recipient and was pretreated with iodoacetamide (IOA), while G. davidsonii was considered the donor and was irradiated with ultraviolet (UV) before fusion. YZ-1 protoplasts stopped growth when treated with 0.5 mmol/L IOA for 20 min, and G. davidsonii protoplasts stopped growth when irradiated with 38.7 J/cm2 UV for 30 s. Asymmetric somatic hybrids were obtained by electrofusion between the separately treated protoplasts of the 2 species. The regenerated plants were identified by morphological, cytological, and molecular analysis. Most regenerated plants derived from fused protoplasts displayed new morphology; some were intermediate between the two parents and a few displayed recipient-like morphology. Chromosome numbers in these somatic hybrids mostly ranged from 40 to 73. The hybridity was confirmed by random amplified polymorphic DNA and simple sequence repeat analysis. Organelle DNA inheritance of the YZ-1 and G. davidsonii somatic hybrid was investigated by cleaved amplified polymorphism sequence and chloroplast simple sequence repeat analysis, which indicated that recombination and rearrangements might have occurred in some regions of mitochondrial and chloroplastic DNA. This is the first report of completely asymmetric hybrid production via donor–recipient fusion between G. hirsutum and G. davidsonii, which is a novel case in hybrid production following the symmetric fusion and asymmetric fusion based on UV irradiation in cotton.展开更多
碳减排作为经济转型发展中的重要环节,必须厘清导致碳排放变化的关键因素及其驱动效应和机理。本文基于投入产出(IOA)与结构分解(SDA)等分析方法,探讨了1997—2012年间中国全行业碳排放变化的驱动力效应。研究表明:(1)中国行业碳排放总...碳减排作为经济转型发展中的重要环节,必须厘清导致碳排放变化的关键因素及其驱动效应和机理。本文基于投入产出(IOA)与结构分解(SDA)等分析方法,探讨了1997—2012年间中国全行业碳排放变化的驱动力效应。研究表明:(1)中国行业碳排放总量不断增加,从53.60亿t增加至158.20亿t,碳排放强度从2.00 t CO_2/万元降至0.86 t CO_2/万元;(2)影响碳排放变化的因素主要包括五个方面,技术进步有利于碳减排,规模效应(经济规模和人口规模)持续推动碳排放的增加,产业联系和经济结构对碳排放的影响导致其波动变化;(3)产业政策可分为宏观控制政策和产业自调整政策,这些政策环境的变化越来越有利于碳减排。2002年之前,中国宏观控制政策鼓励发展第二、三产业,使得经济与人口规模不断扩张,增加了碳排放;2002—2012年间,中国产业自调整政策对碳减排的影响越来越大,由于产业市场竞争不断加强,促进能源大范围流动与产业重组,大大提高了能源利用效率,使得产业联系与经济结构在中国碳减排中起到了重要作用,技术进步不再是唯一减少碳排放的因素,碳减排方式趋于多元化。展开更多
Nonlinear Equations(NEs),which may usually have multiple roots,are ubiquitous in diverse fields.One of the main purposes of solving NEs is to locate as many roots as possible simultaneously in a single run,however,it ...Nonlinear Equations(NEs),which may usually have multiple roots,are ubiquitous in diverse fields.One of the main purposes of solving NEs is to locate as many roots as possible simultaneously in a single run,however,it is a difficult and challenging task in numerical computation.In recent years,Intelligent Optimization Algorithms(IOAs)have shown to be particularly effective in solving NEs.This paper provides a comprehensive survey on IOAs that have been exploited to locate multiple roots of NEs.This paper first revisits the fundamental definition of NEs and reviews the most recent development of the transformation techniques.Then,solving NEs with IOAs is reviewed,followed by the benchmark functions and the performance comparison of several state-of-the-art algorithms.Finally,this paper points out the challenges and some possible open issues for solving NEs.展开更多
为实现磷资源产业可持续发展,以中国磷资源产业为对象,运用投入产出分析(inpu t-ou tpu t ana lys is,IOA)方法对其整个生命周期的元素代谢和物质循环进行定量描述和分析。总结磷元素高效循环利用的技术手段和措施,提出生产智能控缓释...为实现磷资源产业可持续发展,以中国磷资源产业为对象,运用投入产出分析(inpu t-ou tpu t ana lys is,IOA)方法对其整个生命周期的元素代谢和物质循环进行定量描述和分析。总结磷元素高效循环利用的技术手段和措施,提出生产智能控缓释化肥、减少含磷农药使用量、减少含磷洗涤剂使用量、回收人畜粪便生产有机肥料和回收污水中的磷等措施构成6个不同方案改善该系统的物质利用水平,并对元素循环效率等指标进行分析比较。研究结果表明,合理选取、综合采用先进的循环经济技术手段,可以提高中国磷资源产业物质利用水平和元素循环效率。展开更多
文摘虫害是造成农作物减质减产的最主要原因,引入新一代信息技术可以及时有效防治虫害。本文基于农业物联网(Internet of Agriculture,IOA)技术与YOLOX-s目标检测算法设计并搭建了一套农作物虫害监测系统。系统整体框架由信息感知层、信息传输层、信息服务层和系统应用层组成,选用YOLOX-s目标检测算法实现虫害识别功能。实验结果表明,该算法提高了农作物虫害监测的识别准确率。本文所研究的系统有助于农作物虫害防治工作,为智能化虫害防治提供重要参考。
基金Supported by the National Cotton Production Support System (Ministry of Agricul-ture, China)National Key Basic Research and Development Program of China (Grant No. 2004CB117301)
文摘Asymmetric hybrids between Gossypium hirsutum (YZ-1) and G. davidsonii were obtained by donor-recipient fusion. YZ-1 was considered the recipient and was pretreated with iodoacetamide (IOA), while G. davidsonii was considered the donor and was irradiated with ultraviolet (UV) before fusion. YZ-1 protoplasts stopped growth when treated with 0.5 mmol/L IOA for 20 min, and G. davidsonii protoplasts stopped growth when irradiated with 38.7 J/cm2 UV for 30 s. Asymmetric somatic hybrids were obtained by electrofusion between the separately treated protoplasts of the 2 species. The regenerated plants were identified by morphological, cytological, and molecular analysis. Most regenerated plants derived from fused protoplasts displayed new morphology; some were intermediate between the two parents and a few displayed recipient-like morphology. Chromosome numbers in these somatic hybrids mostly ranged from 40 to 73. The hybridity was confirmed by random amplified polymorphic DNA and simple sequence repeat analysis. Organelle DNA inheritance of the YZ-1 and G. davidsonii somatic hybrid was investigated by cleaved amplified polymorphism sequence and chloroplast simple sequence repeat analysis, which indicated that recombination and rearrangements might have occurred in some regions of mitochondrial and chloroplastic DNA. This is the first report of completely asymmetric hybrid production via donor–recipient fusion between G. hirsutum and G. davidsonii, which is a novel case in hybrid production following the symmetric fusion and asymmetric fusion based on UV irradiation in cotton.
文摘碳减排作为经济转型发展中的重要环节,必须厘清导致碳排放变化的关键因素及其驱动效应和机理。本文基于投入产出(IOA)与结构分解(SDA)等分析方法,探讨了1997—2012年间中国全行业碳排放变化的驱动力效应。研究表明:(1)中国行业碳排放总量不断增加,从53.60亿t增加至158.20亿t,碳排放强度从2.00 t CO_2/万元降至0.86 t CO_2/万元;(2)影响碳排放变化的因素主要包括五个方面,技术进步有利于碳减排,规模效应(经济规模和人口规模)持续推动碳排放的增加,产业联系和经济结构对碳排放的影响导致其波动变化;(3)产业政策可分为宏观控制政策和产业自调整政策,这些政策环境的变化越来越有利于碳减排。2002年之前,中国宏观控制政策鼓励发展第二、三产业,使得经济与人口规模不断扩张,增加了碳排放;2002—2012年间,中国产业自调整政策对碳减排的影响越来越大,由于产业市场竞争不断加强,促进能源大范围流动与产业重组,大大提高了能源利用效率,使得产业联系与经济结构在中国碳减排中起到了重要作用,技术进步不再是唯一减少碳排放的因素,碳减排方式趋于多元化。
基金supported by the National Natural Science Foundation of China(No.62076225)the Natural Science Foundation of Guangxi Province(No.2020JJA170038)the High-Level Talents Research Project of Beibu Gulf(No.2020KYQD06).
文摘Nonlinear Equations(NEs),which may usually have multiple roots,are ubiquitous in diverse fields.One of the main purposes of solving NEs is to locate as many roots as possible simultaneously in a single run,however,it is a difficult and challenging task in numerical computation.In recent years,Intelligent Optimization Algorithms(IOAs)have shown to be particularly effective in solving NEs.This paper provides a comprehensive survey on IOAs that have been exploited to locate multiple roots of NEs.This paper first revisits the fundamental definition of NEs and reviews the most recent development of the transformation techniques.Then,solving NEs with IOAs is reviewed,followed by the benchmark functions and the performance comparison of several state-of-the-art algorithms.Finally,this paper points out the challenges and some possible open issues for solving NEs.
文摘为实现磷资源产业可持续发展,以中国磷资源产业为对象,运用投入产出分析(inpu t-ou tpu t ana lys is,IOA)方法对其整个生命周期的元素代谢和物质循环进行定量描述和分析。总结磷元素高效循环利用的技术手段和措施,提出生产智能控缓释化肥、减少含磷农药使用量、减少含磷洗涤剂使用量、回收人畜粪便生产有机肥料和回收污水中的磷等措施构成6个不同方案改善该系统的物质利用水平,并对元素循环效率等指标进行分析比较。研究结果表明,合理选取、综合采用先进的循环经济技术手段,可以提高中国磷资源产业物质利用水平和元素循环效率。