拖拉机是一种用途非常广泛的农业机械,既可用于牵引和驱动作业机械完成各项移动式作业的自走式动力机械,也可做固定作业的动力源,其因挂载机具的不同,用于不同类型的农业生产,是农业生产资料中最重要的一部分。随着农业现代化的推进,智...拖拉机是一种用途非常广泛的农业机械,既可用于牵引和驱动作业机械完成各项移动式作业的自走式动力机械,也可做固定作业的动力源,其因挂载机具的不同,用于不同类型的农业生产,是农业生产资料中最重要的一部分。随着农业现代化的推进,智能拖拉机作为精准农业的重要工具的应用日益广泛。拖拉机地头管理系统(Tractor Field Management System,TFMS)作为智能拖拉机的核心组成部分,通过集成先进的控制技术和信息技术,可以显著提高农业的生产效率和作业质量,减轻劳动者的劳动强度。本文重点针对中国耕地地块面积大小不一、国内拖拉机企业研发实力参差不齐、市场端的客户购买力差距较大等情况,提出了对不同等级的拖拉机配置不同等级的地头管理系统,以提高农业生产效率及作业质量。展开更多
The Upper Cretaceous of Tantou Basin in western Henan has yielded many vertebrate fossils,which are featured by several non-avian dinosaurs.Meanwhile,studies on their eggs were yet inadequate though many eggshells hav...The Upper Cretaceous of Tantou Basin in western Henan has yielded many vertebrate fossils,which are featured by several non-avian dinosaurs.Meanwhile,studies on their eggs were yet inadequate though many eggshells have been reported.The newly discovered material 41HⅤ0199 was excavated from the Upper Cretaceous Qiupa Formation in 2021.The block preserves eight complete eggs arranged in two partial rings that form a partial clutch,and there are some scattered eggshells preserved closely with the block,showing a concave-up to concave-down ratio of 54.5:45.5,which indicates that the scattered eggshells come from the clutch and the clutch had been partially broken before it was buried.Based on morphological and microstructural characteristics,the eggs and eggshells can be assigned to Macroolithus yaotunensis(Elongatoolithidae),an oospecies known to be related to oviraptorids,which leads Yulong mini to be its probable producer.Besides,some eggshells show microstructural signs indicating egg retention,which marks the second example of egg retention in the oofamily Elongatoolithidae.展开更多
文摘拖拉机是一种用途非常广泛的农业机械,既可用于牵引和驱动作业机械完成各项移动式作业的自走式动力机械,也可做固定作业的动力源,其因挂载机具的不同,用于不同类型的农业生产,是农业生产资料中最重要的一部分。随着农业现代化的推进,智能拖拉机作为精准农业的重要工具的应用日益广泛。拖拉机地头管理系统(Tractor Field Management System,TFMS)作为智能拖拉机的核心组成部分,通过集成先进的控制技术和信息技术,可以显著提高农业的生产效率和作业质量,减轻劳动者的劳动强度。本文重点针对中国耕地地块面积大小不一、国内拖拉机企业研发实力参差不齐、市场端的客户购买力差距较大等情况,提出了对不同等级的拖拉机配置不同等级的地头管理系统,以提高农业生产效率及作业质量。
文摘The Upper Cretaceous of Tantou Basin in western Henan has yielded many vertebrate fossils,which are featured by several non-avian dinosaurs.Meanwhile,studies on their eggs were yet inadequate though many eggshells have been reported.The newly discovered material 41HⅤ0199 was excavated from the Upper Cretaceous Qiupa Formation in 2021.The block preserves eight complete eggs arranged in two partial rings that form a partial clutch,and there are some scattered eggshells preserved closely with the block,showing a concave-up to concave-down ratio of 54.5:45.5,which indicates that the scattered eggshells come from the clutch and the clutch had been partially broken before it was buried.Based on morphological and microstructural characteristics,the eggs and eggshells can be assigned to Macroolithus yaotunensis(Elongatoolithidae),an oospecies known to be related to oviraptorids,which leads Yulong mini to be its probable producer.Besides,some eggshells show microstructural signs indicating egg retention,which marks the second example of egg retention in the oofamily Elongatoolithidae.
