基于GF-1数据的南京江北新区植被覆盖度遥感估算     

高磊  卢刚 《安徽农业科学》2016,(10)

以南京江北新区为研究区,选用GF-1 16 m分辨率的MFV4多光谱传感器数据,基于像元二分模型对研究区进行植被覆盖度遥感估算。结果表明,GF-1数据可以快速有效地反映地表植被的空间分布状况。对结果的分级统计显示,江北新区植被覆盖较高,生态环境良好,适宜打造绿色宜居区域。  相似文献   

多功能自动标签机机构设计与优化     

郭继亮  陈爱平  杨万里  李聪 《山东饲料》2015,(2):57-58

标签机是目前工业贴标应用最广泛的机器,其自动贴标签机贴标的效率与质量,较人工有着无法比拟的优势,所以对其设计和优化有着重大的工业革命性意义。本课题就现有的自动标签机的出标机构,传送机构等机构进行了优化,如何实现自动标签机的不间歇运动和多功能贴标等功能做出了论述。  相似文献   

The innovation effect of low-carbon technology transfer from the perspective of carbon emission reduction demand: A case study of the Yangtze River Economic Belt in China     

Zefeng Mi  Zhixin Qiu  Gang Zeng  Can Zhou  Lei Ye 《Growth and change》2023,54(2):625-648

Reducing carbon emissions is the only way to solve the global climate problem, which obviously requires the joint efforts of all regions. From the perspective of carbon emission reduction demand, this research obtains the data of low-carbon patents and CO₂ emissions from 2000 to 2019, and then explores the innovation effect of low-carbon technology transfer in the Yangtze River Economic Belt (YREB). We draw the following conclusions: (1) Low-carbon technology transfer has a positive impact on low-carbon technology innovation. However, a large number of low-carbon technology transfers are concentrated between developed regions in the YREB at present. (2) No matter from the perspective of total amount or efficiency, carbon emission reduction demand can play positive moderating role in the process of exerting the innovation effect of low-carbon technology transfer, indicating that the transfer of low-carbon technologies to regions with high demand is efficient. (3) The moderating effect of carbon emission reduction demand in different regions has regional heterogeneity. Carbon emissions per unit of GDP plays a greater role in moderating the innovation effect of low-carbon technology transfer in the eastern region, while CO₂ emissions plays a greater role in the central and western regions. Therefore, we propose to strengthen the transfer of low-carbon technologies between developed and less-developed regions, and adopt differentiation strategies according to the actual situation of each region. Our research has deepened the understanding of environmental economic geography on the innovation effect of low-carbon technology transfer, and has reference significance for global low-carbon technology cooperation.  相似文献   

Method for automatic georeferencing aerial remote sensing (RS) images from an unmanned aerial vehicle (UAV) platform     

Haitao Xiang  Lei Tian 《Biosystems Engineering》2011,108(2):104-113

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黄瓜低霜霉威残留性相关基因SDH克隆及表达     

秦智伟  郭磊  周秀艳  辛明 《东北农业大学学报》2016,(4):24-33

通过Solexa技术和比较基因组学方法鉴定霜霉威胁迫下黄瓜果实差异表达基因,筛选黄瓜低霜霉威残留性相关基因SDH。研究利用PCR克隆获得SDH基因全长,命名为Cs SDH。构建亚细胞定位表达载体,利用农杆菌浸润法注射烟草叶片后激光共聚焦显微镜下观察;分别用荧光定量RT-PCR方法和酶联免疫法研究高、低农残品系D9320和D0351中Cs SDH基因在农药霜霉威处理后,不同时间点、不同组织部位时空表达特征和琥珀酸脱氢酶活性。结果表明,Cs SDH基因在烟草叶片细胞中被定位在细胞膜上。黄瓜低农残品种D0351中,Cs SDH基因在果实受霜霉威胁迫后反应迅速,主要在处理前期响应表达强烈,琥珀酸脱氢酶活性显著增加,且该基因表达量显著高于其在高农残品种D9320中表达量。Cs SDH果、叶中表达量较茎中高,且各组织部位表达量高低顺序稳定,为叶果茎。黄瓜高农残品种D9320中,Cs SDH基因表达量在0.5、1、3、12 h呈现上调表达,6、9 h基因表达量差异不显著,48 h出现上调表达高峰。说明克隆得到的Cs SDH基因属农药处理前期响应基因,且该基因可能在降低黄瓜农药残留过程中发挥重要作用。试验通过研究黄瓜琥珀酸脱氢酶基因(SDH)在霜霉威胁迫下表达情况,为挖掘黄瓜低农药残留性功能基因以及探明其作用分子机制奠定基础。  相似文献   

酒石酸泰万菌素对特定畜禽疫病防治功效研究进展     

万进  马妮妮  王聪 《中国动物检疫》2021,38(8):75-78

酒石酸泰万菌素(简称泰万菌素)系大环内酯类动物专用抗生素。本文综述了泰万菌素防治敏感细菌感染、支原体病、猪痢疾以及猪繁殖与呼吸综合征等畜禽疫病的功效研究成果,证实泰万菌素对于防治上述畜禽疫病功效显著。近年来研究发现,泰万菌素活性不同于其他类抗生素,可作为抗病毒药物使用,特别适用于对猪繁殖与呼吸综合征的治疗。泰万菌素可抑制病毒复制,缩短病毒血症周期,降低死亡率,减轻临床症状;同时还可通过降低母猪流产率,提高产健康仔猪数以及改善母猪、仔猪病毒血症等,达到控制病毒垂直传播的目的。在当前日益关注兽药残留、动物源细菌耐药性的社会背景下,泰万菌素制剂能很好满足畜禽养殖场用药需求。  相似文献   

Development of a low-cost agricultural remote sensing system based on an autonomous unmanned aerial vehicle (UAV)     

Haitao Xiang  Lei Tian 《Biosystems Engineering》2011,108(2):174-190

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Analysis of Inter-Individual Bacterial Variation in Gut of Cicada Meimuna mongolica (Hemiptera: Cicadidae)     

Wenting Zhou  Xiaoning Nan  Zhou Zheng  Cong Wei  Hong He 《Journal of insect science (Online)》2015,15(1)

Intestinal bacterial community plays a crucial role in the nutrition, development, survival, and reproduction of insects. When compared with other insects with piercing-sucking mouthparts, the habitats of cicada nymphs and adults are totally different. However, little is known about the differences in the gut bacterial communities in the nymphs and adults within any cicada species. The diversity of bacteria in the gut of nymphs and adults of both genders of Meimuna mongolica (Distant) was studied using the denaturing gradient gel electrophoresis (DGGE) method. Few inter-individual variations among gut microbiota were observed, suggesting that M. mongolica typically harbors a limited and consistent suite of bacterial species. Bacteria in the genera Pseudomonas and Enterobacter were the predominant components of the gut microflora of M. mongolica at all life stages. Bacteria of Pantoea, Streptococcus, and Uruburuella were also widespread in the cicada samples but at relatively lower concentrations. The relative stability and similarity of the PCR-DGGE patterns indicate that all individuals of this cicada species harbor a characteristic bacterial community which is independent from developmental stages and genders. Related endosymbionts that could be harbored in bacteromes of cicadas were not detected in any gut samples, which could be related to the cicada species and the distribution of these endosymbionts in the cicada cavity, or due to some of the possible limitations of PCR-DGGE community profiling. It is worthwhile to further address if related cicada endosymbiont clades distribute in the alimentary canals and other internal organs through diagnostic PCR using group-specific primer sets.  相似文献   

中国荷斯坦牛干奶期长度的群体特征及其与生产性能的关系     

宁景扬  马龙刚  陈紫薇  安涛  常瑶  王凯  王磊  陈少侃  张帆  郭刚  张海亮  王雅春 《中国畜牧兽医》2021,48(9):3368-3377

本研究旨在探究北京地区中国荷斯坦牛干奶期长度（DPL）的变化规律及其变异对奶牛各项生产性能的影响，包括产奶性能、繁殖性能、初乳品质和乳房健康。收集了北京地区34个牧场出生于2009—2018年136 231头中国荷斯坦牛的干奶日期、生产性能记录、繁殖性能记录等。通过整理试验牛群的干奶记录，揭示了北京地区中国荷斯坦牛1胎和2胎DPL的群体规律，利用固定模型分析了胎次、产犊季节、场-产犊年和初产月龄对DPL的影响；此外，利用固定模型分析了DPL的变异对日产奶量、乳脂率、乳蛋白率、首末次配种间隔（interval from first to last insemination，IFL）、产犊至首次配种间隔（interval from calving to first insemination，ICF）和初乳品质的影响，利用Logistic回归过程分析了DPL的变异对首次配种受胎率（conception rate of first insemination，CR）、首次配种56 d不返情率（56-days non-return rate of first insemination，NRR56）、难产率和乳房健康的影响。研究结果显示，北京地区中国荷斯坦牛DPL平均为58.81 d，胎次、产犊季节、场-产犊年和初产月龄均对DPL有显著影响（P<0.05）。DPL的变异对日产奶量、乳蛋白率、ICF、CR、NRR56、难产率和乳房健康有显著影响（P<0.05）。干奶期短的奶牛测定日平均乳蛋白率、CR和NRR56更高；DPL适中的奶牛测定日平均产奶量更高、乳房健康水平更好、ICF更短、难产率更低。本研究在国内利用大规模牛群数据揭示了中国荷斯坦牛DPL的群体规律，可为中国规模化奶牛场提升管理水平提供参考。  相似文献   

酸化红薯粉渣对肉兔生长性能、免疫器官指数和胃肠pH的影响     

王中华  毕玉霞  丛付臻 《中国饲料》2012,(11):36-38

为探讨酸化红薯粉渣对肉兔生长性能、免疫器官指数和胃肠pH的影响,试验采用单因子完全随机分组设计,选取128只(公母各半)50日龄体重相近的新西兰兔随机分为4个处理组(对照组、试验1组、2组和3组),每组4个重复,分别饲喂含0%、5%、10%、15%酸化红薯粉渣的饲粮。结果表明,与对照组相比,试验2组和3组肉兔日均采食量、平均日增重、胸腺指数和脾脏指数均显著提高(P<0.05),胃pH显著降低(P<0.05);试验1、2和3组腹泻率、十二指肠pH、盲肠pH均有所降低(P>0.05)。由此可见,在饲料中添加适量的酸化红薯粉渣能提高肉兔的生长性能和免疫器官指数,降低胃肠pH,其中添加量为10%~15%效果较理想。  相似文献