检索结果-南通市图书馆

Genome-wide association study of seedling nitrogen-use efficiency-associated traits in common wheat(Triticum aestivum L.)

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2024年第1期12卷 222-231页

作者： Huawei Shi Weichong Wang lifeng Gao Jirong Wu Chengmei Hu Huishu Yan Yugang Shi ning li Youzhi Ma Yongbin Zhou Zhaoshi Xu Jun Chen Wensi Tang Kai Chen Daizhen Sun Yuxiang Wu Ming Chen College of Agriculture Shanxi Agricultural UniversityJinzhong 030801ShanxiChina National Key Facility for Crop Gene Resources and Genetic Improvement Key Laboratory of Biology and Genetic Improvement of Triticeae CropsMinistry of AgricultureInstitute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

Nitrogen(N)fertilizer application is essential for crop-plant growth and *** genetic loci associated with N-use efficiency(NUE)could increase wheat yields and reduce environmental pollution caused by *** subjected a panel of 389 wheat accessions to N and chlorate(a nitrate analog)treatments to identify quantitative trait loci(QTL)controlling NUE-associated traits at the wheat seedling *** the panel with a 660K single-nucleotide polymorphism(SNP)array,we identified 397 SNPs associated with N-sensitivity index and chlorate inhibition *** SNPs were merged into 49 QTL,of which eight were multi-environment stable QTL and 27 were located near previously reported QTL.A set of 135 candidate genes near the 49 QTL included TaBOX(F-box family protein)and TaERF(ethylene-responsive transcription factor).A Tabox mutant was more sensitive to low-N stress than the wild-type *** developed two functional markers for Hap 1,the favorable allele of TaBOX.

关键词： Wheat NUE Genome-wide association study Nitrogen sensitive index Chlorate inhibition rate

基于数学偏微分算法的水稻插秧机控制系统优化

在线全文

学校读者我要写书评

暂无评论

农机化研究 2024年第4期46卷 234-238页

作者：李宁郑州升达经贸管理学院郑州451191

为进一步提升我国水稻插秧机的综合作业效率,以数学偏微分应用思维为改善切入点,针对整机控制系统展开优化研究。以充分分析插秧机各功能实现为基点,搭建数学偏微分模型,进行系统控制优化与整机部件改进,设计出全新的功能提升型水稻插秧... 详细信息

为进一步提升我国水稻插秧机的综合作业效率,以数学偏微分应用思维为改善切入点,针对整机控制系统展开优化研究。以充分分析插秧机各功能实现为基点,搭建数学偏微分模型,进行系统控制优化与整机部件改进,设计出全新的功能提升型水稻插秧机,实施插秧作业。试验结果表明:经数学偏微分算法及控制思维导入,水稻插秧机的整机核心作业参数得到显著提升,秧深精度与系统稳定度均可保持在93.00%以上,插秧合格率相对提升了8.58%,秧苗损失率可降低至0.45%,整机作业效率可达91.12%,符合水稻插秧机的设计标准及预期优化目标,具有较强的应用推广价值。

关键词：水稻插秧机智能化偏微分模型插秧合格率功能提升

维普期刊数据库博看期刊

可生物降解塑料取代传统塑料--对碳排放的影响

在线全文

学校读者我要写书评

暂无评论

Engineering 2024年第1期32卷 152-162页

作者： Guanyi Chen Jianyuan li Yunan Sun Zhi Wang Gary ALeeke Christian Moretti Zhanjun Cheng Yuan Wang ning li Lan Mu Jinyu li Junyu Tao Beibei Yan li'an Hou Interdisciplinary Innovation Lab for Environment and Energy School of Mechanical Engineering&School of Biotechnology and Food ScienceTianjin University of CommerceTianjin 300134China School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China School of Ecology and Environment Tibet UniversityLhasa 850012China Tianjin Key Laboratory of Biomass Wastes UtilizationTianjin Engineering Research Center for Organic Wastes Safe Disposal and Energy UtilizationTianjin 300072China School of Chemical Engineering University of BirminghamBirmingham B152TTUK Department of Environmental Systems Science ETH ZürichZürich CH-8092Switzerland

In recent years,a great deal of attention has been focused on the environmental impact of plastics,includ-ing the carbon emissions related to plastics,which has promoted the application of biodegradable *** worldwide have shown high interest in replacing traditional plastics with biodegradable ***,no systematic comparison has been conducted on the carbon emissions of biodegrad-able versus traditional plastic *** study evaluates the carbon emissions of traditional and biodegradable plastic products(BPPs)over four stages and briefly discusses environmental and economic *** scenarios-namely,the traditional method,chemical recycling,industrial composting,and anaerobic digestion-are considered for the disposal of waste BPPs(WBPPs).The analysis takes China as a case *** results show that the carbon emissions of 1000traditional plastic products(plastic bags,lunch boxes,cups,etc.)were52.09-150.36 carbon emissions equivalent of per kilogram(kg CO_(2)eq),with the stage of plastic production contributing 50.71%-50.77%.In comparison,1000 similar BPPs topped out at 21.06-56.86 kg CO_(2)eq,approximately 13.53%-62.19%lower than traditional plastic *** difference was mainly at the stages of plastic production and waste disposal,and the BPPs showed significant carbon reduction potential at the raw material acquisition *** disposal plays an important role in environmental impact,and composting and anaerobic digestion are considered to be preferable disposal methods for ***,the high cost of biodegradable plastics is a challenge for their widespread *** study has important reference significance for the sustainable development of the biodegradableplastics industry.

关键词： Carbon emissions Biodegradable plastics Different disposal scenarios Daily life consumption Environmental and economic discussion

粮食产能安全责任的制定与层级政府分配——基于产能约束性指标的文本分析

在线全文

学校读者我要写书评

暂无评论

农村经济 2024年第5期 66-76页

作者：李宁李婧慧南京财经大学粮食安全与战略研究中心江苏南京210023 江西省粮油科技创新和物资储备中心江西南昌330046

粮食产能安全约束性指标的首次确立,成为国家保障粮食安全、压实地方政府粮食安全主体责任的又一重大举措。本文从治理风险的交易成本角度入手,并借助对“十四五”规划和粮食产能约束性指标文本的收集和手工整理,系统考察了粮食产能安... 详细信息

粮食产能安全约束性指标的首次确立,成为国家保障粮食安全、压实地方政府粮食安全主体责任的又一重大举措。本文从治理风险的交易成本角度入手,并借助对“十四五”规划和粮食产能约束性指标文本的收集和手工整理,系统考察了粮食产能安全政府责任的产生缘由、制度内涵与具体运行机制。研究发现:(1)粮食供给的风险治理构成了政府承担粮食产能安全主体责任的重要缘由;(2)在现有的农地产权制度架构下,地方政府承担粮食产能安全责任的制度内涵,并非是要求各级政府强制干预农户自主的种植经营权利,而是主要通过约束政府占用耕地和强调提高种粮综合收益的政府行为,以达到遏制农地非农化和预防耕地非粮化的风险治理目的;(3)责任运行的指标体系上,从中央到地方各级政府主要将粮食产能约束性指标细分为粮食面积和粮食产量两类指标体系,其中粮食面积较之粮食产量在采用地区数量上占比更高,且指标用词也更显约束性;(4)责任指标在层级政府间的纵向与横向配置上,各级地方政府均严格落实并分解了上级政府的粮食产能指标,加码特征并不显著,但呈现出分布不平衡和集中化特征。

关键词：粮食产能安全政府主体责任约束性指标层级分配

考虑多类型时间依赖资源约束的敏捷卫星调度优化

在线全文

学校读者我要写书评

暂无评论

控制理论与应用 2024年第6期41卷 1038-1046页

作者：李君邢立宁彭观胜徐运保湖南工程学院管理学院湖南长沙410073 西安电子科技大学电子工程学院陕西西安710071 中国人民解放军军事科学院国防科技创新研究院北京100000

随着现代空间科技的迅猛发展,光学遥感图像数据的应用需求越来越广泛,大力推动了光学对地观测卫星的发展.然而,由于高昂的发射成本的约束,对地观测卫星的资源是有限的,远远无法满足各类数据需求.因此,提高对地观测卫星的使用效率,提高... 详细信息

随着现代空间科技的迅猛发展,光学遥感图像数据的应用需求越来越广泛,大力推动了光学对地观测卫星的发展.然而,由于高昂的发射成本的约束,对地观测卫星的资源是有限的,远远无法满足各类数据需求.因此,提高对地观测卫星的使用效率,提高其任务执行率,具有非常重要的应用价值.本文聚焦于敏捷对地观测卫星的任务调度问题,即在给定的调度周期内,对有限的卫星资源制定合理的任务调度方案,在满足一定星上资源约束下,最大化观测任务收益.该问题难点在于星上的资源是非常有限的,例如存储图像数据的固存资源、用于采集数据和卫星姿态切换的能量资源及执行任务活动耗费的时间资源.需要注意的是,能量消耗量和时间消耗量依赖于任务的执行时间,这是敏捷卫星相对传统的非敏捷卫星独有的特性.不同任务场景对不同类型资源的需求不同,多种资源约束互相耦合,资源约束具有时间依赖特性,这些难点无疑极大地增加了卫星调度的求解难度.为高效地求解该问题,本文构建了多类型时间依赖资源约束的敏捷卫星调度整数规划模型,并针对问题特性提出了一种基于自适应选择因子的迭代局部搜索启发式算法.自适应选择因子综合考虑了目标收益、资源消耗量、资源约束的松弛量,采用动态变化的资源重要度,能快速自适应地根据当前场景下各种类型的资源数据使用量来确定最佳局部搜索方向,从而在有限时间内找到高质量的解.实验结果证明,本文所提出的算法在多种情况下相比当前最好算法求解效果显著更优.此外,算法独有的自适应选择因子相比传统的选择因子的求解质量更高,这是因为所设计的自适应选择因子兼顾了目标收益和资源消耗量之间权衡关系的同时,采用动态变化的资源重要度准确捕捉了资源需求的迫切程度.

关键词：卫星调度迭代局部搜索动态规划时间依赖性数据验证

同方期刊数据库博看期刊

Carbon dots-incorporated CuSeO_(3)rationally regulates activity and selectivity of the hydrogen species via light-converted electrons

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第1期35卷 332-337页

作者： Yuqi Ren Hongxu Zhang Caihong Hao Qing Chang ning li Jinlong Yang Shengliang Hu Research Group of New Energy Materials and Devices North University of ChinaTaiyuan 030051China State Key Laboratory of New Ceramics and Fine Processing Tsinghua UniversityBeijing 100084China

The chemoselective hydrogenation of structurally diverse nitroaromatics is a challenging ***,catalyst activity tends to decrease when excellent selectivity is *** here present a novel photocatalyst combining amino-functionalized carbon dots(N-CDs)with copper selenite nanoparticles(N-CDs@CuSeO_(3))for simultaneously improving selectivity and *** visible light irradiation,the prepared N-CDs@CuSeO_(3)exhibits 100%catalytic selectivity for the formation of 4-aminostyrene at full conversion of 4-nitrostyrene in aqueous solvent within a few *** excellent photocatalytic performance is mainly attributed to the precise control of the hydrogen species released from the ammonia borane by means of light-converted electrons upon N-CDs@CuSeO_(3).Besides,the defect states at the interface of N-CDs and CuSeO_(3)enable holes to be trapped for promoting separation and transfer of photogenerated charges,allowing more hydrogen species to participate in catalytic reaction.

关键词： Heterostructure Carbon dots Photocatalysis Chemoselective hydrogenation Copper selenite

在线全文

学校读者我要写书评

暂无评论

从逻辑视角探寻当代哲学学术互鉴的发展路径

河北学刊 2024年第3期44卷 91-97页

作者：宁莉娜上海大学哲学系

对当代逻辑学与哲学关系的研究,需要在交往、对话与互鉴中打通中外学术研究的疆界,以前瞻的研究理念、开阔的国际视野和创新的学术见解,推进国际学术共同体的构建与发展。从逻辑的视角出发,当代哲学需要在深入对话中对“自明”前提展开... 详细信息

对当代逻辑学与哲学关系的研究,需要在交往、对话与互鉴中打通中外学术研究的疆界,以前瞻的研究理念、开阔的国际视野和创新的学术见解,推进国际学术共同体的构建与发展。从逻辑的视角出发,当代哲学需要在深入对话中对“自明”前提展开分析,并通过有效的交流论证形成学术互鉴,进而为逻辑学和哲学的学术成果实现创造性转化与创新性发展拓宽路径。当代中国的逻辑学与哲学研究作为国际学术思想体系的重要组成部分,尤其要凸显学术研究的主体意识与世界意义。

关键词：逻辑视角当代哲学学术互鉴

采用改进特征子空间投影的SAR脉冲式直达波干扰抑制方法

在线全文

学校读者我要写书评

暂无评论

电子与信息学报 2024年第4期46卷 1382-1390页

作者：舒高峰刘明月李宁河南大学计算机与信息工程学院开封475004 河南大学河南省大数据分析与处理重点实验室开封475004 河南大学河南省空间信息处理工程研究中心开封475004

射频干扰(RFI)会污染合成孔径雷达(SAR)回波信号,增加SAR图像解译难度。脉冲式直达波干扰(PDWI)作为典型的RFI,在原始回波域以明亮条纹状掩盖SAR回波信息,对SAR成像质量产生严重影响。现有的干扰抑制方法中,传统的特征子空间投影(ESP)... 详细信息

射频干扰(RFI)会污染合成孔径雷达(SAR)回波信号,增加SAR图像解译难度。脉冲式直达波干扰(PDWI)作为典型的RFI,在原始回波域以明亮条纹状掩盖SAR回波信息,对SAR成像质量产生严重影响。现有的干扰抑制方法中,传统的特征子空间投影(ESP)方法对整条含干扰脉冲进行干扰抑制,造成了脉冲中非干扰位置有用信号损失。为了保护有用信号,该文提出一种改进ESP的SAR脉冲式直达波干扰抑制方法。首先,通过两次检测干扰,获取PDWI在时域中的具体位置。其次,仅对检测的干扰位置数据,采用ESP将有用信号和干扰信号分离。最后,从原始数据中减去ESP重构的干扰数据以实现干扰抑制。仿真和实测数据处理表明,与现有方法相比,该方法能够有效避免SAR原始数据中有用信号的损失,抑制了脉冲式直达波干扰。

关键词：射频干扰合成孔径雷达脉冲式直达波干扰特征子空间投影

Evaluation and Influencing Factors on Particle Agglomeration in RAP

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 60-68页

作者：唐伟李宁 ZHUANG Yuan ZHAN He YU Xin WU Wenxiu DING Gongying College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China Jiangsu Expressway Engineering Maintenance Technology Center Nanjing 211106China Jinhua Highway and Transportation Management Center Jinhua 321000China

Asphalt extraction test and scanning electron microscopy(SEM) were used for analysis of agglomerations of reclaimed asphalt pavement(RAP) particles. In order to quantify the agglomeration degree of RAP, the fineness modulus ratio(FMR) and the percentage loss index(Pli) were proposed. In addition, grey correlation analysis was conducted to discuss the relationship between particle agglomerations and RAP size,asphalt content(AC), and surface area. Two indexes indicate that the agglomeration degree increases in general as the RAP size reduces. This can be attributed to that particles are prone to agglomeration in the case of higher AC. Based on the SEM images and the material composition of RAP, the particle agglomeration in RAP can be classified into weak agglomeration and strong agglomeration. Grey correlation analysis shows that AC is the crucial factor affecting the agglomeration degree and RAP variability. In order to produce consistent and stable reclaimed mixtures, disposal measures of RAP are suggested to lower the AC of RAP.

关键词： RAP particle agglomeration grey correlation analysis asphalt content