检索结果-南通市图书馆

Optimization of aviation adjuvants based on wettability analysis for insecticide application on maize using UAV

International Journal of Agricultural and Biological Engineering 2021年第5期14卷 11-18页

作者： Yu zang Zhiyan Zhou Ying zang Xiwen Luo Juan Liao Rui Ming Cancan Song le Zi Rui Jiang Hanxiang Xiao College of Engineering South China Agricultural University/Guangdong Engineering Research Center for Agricultural Aviation Application(ERCAAA)Guangzhou 510642China National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology(NPAAC) Guangzhou 510642China Key Laboratory of Key Technology on Agricultural Machine and Equipment(South China Agricultural University) Ministry of EducationGuangzhou 510642China Institute of Plant Protection Guangdong Academy of Agricultural SciencesGuangzhou 510640China

Adjuvants can increase the control efficacy of diseases and insect pests by changing the physico-chemical properties of *** of the aviation spray adjuvants are versions of ground *** insecticide sprays with unmanned aerial vehicles(UAV),have problems such as relatively low droplet deposition rate and poor ***,wettability research and optimization tests for aviation spray adjuvants are *** present study screened 12 spray adjuvants using physico-chemical property *** adjuvants were applied to improve the droplet deposition and control efficacy in maize borers controlling by *** selected spray adjuvants were Po2(a hyperbranched polymer adjuvant)and VO3(a vegetable oil adjuvant).Results showed that,(1)When Po2 was added in water-dispersible granules(WGs)at volume rate of 12 L/hm2,the dynamic surface tension(DST)of WGs was decreased by 37.41%,and the maize leaves were covered by droplets 100%,the droplet deposition was increased by 104%and maize borer control was increased by 46%;(2)VO3 decreased the surface tension of ultra-low-volume(ULV)formulation by 12.02%and the maize leaves were covered by droplets 100%.The effect of VO3 on improving the droplet deposition and control efficacy at 12 L/hm2 with ULV was not ***,the addition of aviation spray adjuvant to improve the wettability of WGs significantly improved the droplet deposition and control efficacy but it had no significant effect on the ULV formulation.

关键词： unmanned aerial vehicles spray adjuvants wettability maize insecticide application

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Two Diode Lasers Simultaneously Optically Locked by Orthogonal Polarizations of a Monolithic Confocal Cavity

引用

Chinese Physics letters 2011年第10期28卷 106-108页

作者： PENG Yu ZHAO Yang LI Ye YANG Tao CAO Jian-Ping FANG Zhan-Jun zang er-Jun Center of Time and Frequency Metrology National Institute of MetrologyBeijing 100013 Department of Precision Instruments and Mechanology Tsinghua UniversityBeijing 100084

We demonstrate two self-injection locking extended cavity diode lasers(ECDLs)using resonant optical feedback independently from s-and p-polarizations of a monolithic folded Fabry–Perot confocal cavity(MFC).The relative frequency shift of adjacent axial modes of s resonance and p resonance of MFC is around 1.030 *** note measurements between the two ECDLs are performed and present a relative linewidth of 4 *** the help of a narrow-linewidth reference laser,the linewidth of s-component and p-component ECDLs are measured to be about 32 kHz and 40 kHz,respectively.

关键词： CDL cavity MFC

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Diode Laser Optically Injected by Resonance of a Monolithic Cavity

引用

Chinese Physics letters 2011年第11期28卷 128-130页

作者： PENG Yu ZHAO Yang LI Ye YANG Tao CAO Jian-Ping FANG Zhan-Jun zang er-Jun Center of Time and Frequency Metrology National Institute of Metrology18 Beisanhuan East Rd.Beijing 100013 Department of Precision Instruments and Mechanology Tsinghua UniversityBeijing 100084

We demonstrate a self-injection locking extended cavity diode laser(ECDL)using resonant optical feedback from the p-polarization of a monolithic folded Fabry–Perot parallel cavity(MFC).The full width at half maximum of the MFC resonance is 31 *** the help of a narrow-linewidth reference laser,the linewidth of the ECDL is measured to be about 7 *** frequency of the laser could be tuned at 160MHz with an amplitude of 40V by a PZT mounted on the monolithic cavity and the voltage tuning coefficient is about 4 MHz/V.

关键词： polarization tuning Optically

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mode splitting transmission effect of surface wave excitation through a metal hole array

引用

Light(Science & Applications) 2013年第1期2卷 192-196页

作者： Lin Chen Yiming Zhu Xiaofei zang Bin Cai Zhou Li le Xie Songlin Zhuang Engineering Research Center of Optical Instrument and System Ministry of EducationShanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

The resonant frequencies of the excited surface waves on a metal hole array with respect to the incident angle were studied in the terahertz *** experimental and theoretical results demonstrate that the resonant peak of surface wave excitation splits into two when transmitted through a metal hole array *** high-order mode with resonant frequency above the cutoff frequency fc(plasma frequency effect)has a shorter attenuation length than that of the low-order mode whose resonant frequency is below *** reason is that the high-order mode is a coupled mode consisting of surface wave and hole modes,while the low-order mode is just an excited surface wave(which can be considered as the spoof surface plasmons).Our investigation may open a door to distinguish the spoof surface plasmons and the coupled modes of surface waves and hole modes.

关键词： angular dependence cutoff frequency metal hole arrays surface waves terahertz

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

NUMerICAL SIMULATION OF HIGHLY UNDerEXPANDED AXISYMMETRIC JET WITH RUNGE-KUTTA DISCONTINUOUS GALerKIN FINITE EleMENT METHOD

引用

Journal of Hydrodynamics 2008年第5期20卷 617-623页

作者： CHEN er-yun MA Da-wei le Gui-gao WANG kai ZHAO Gai-ping School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China School of Medical Instrument Shanghai university of Science and Technology Shanghai 200093 China

Highly undcrexpanded axisymmctric jet was simulated using the Runge-Kutta Discontinuous Galerkin （RKDG） finite element method, which, based on two-dimensional conservation laws, was used to solve the axisymmetric Euler equations. The computed results show that the complicated flow field structures of interest, including shock waves, slipstreams and the triple point observed in experiments could be well captured using the RKDG finite element method. Moreover, comparisons of the Mach disk location exhibit excellent agreements between the computed results and experimental measurements, indicating that this method has high capability of capturing shocks without numerical oscillation and artificial viscosity occurring near the discontinuous point.

关键词： underexpanded jct shock RKDG finite element method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

盐生草根系基因HgAKR6C的克隆与初步功能分析

引用

草业学报 2024年第1期33卷 61-74页

作者：胡尚钦汪军成姚立蓉司二静马小乐杨轲张宏孟亚雄王化俊李葆春甘肃农业大学干旱生境作物学国家重点实验室甘肃省作物遗传改良与种质创新重点实验室甘肃兰州730070 甘肃农业大学生命科学技术学院甘肃兰州730070 甘肃农业大学农学院甘肃兰州730070

醛酮还原酶(AKR)是构成Shaker型K+通道蛋白的保守核心结构域,在植物应对非生物胁迫时起到关键作用。本研究采用西北旱区典型盐生植物盐生草作为研究材料,基于课题组前期盐生草根系盐胁迫转录组学数据分析结果,筛选并克隆得到耐盐基因HgA... 详细信息

醛酮还原酶(AKR)是构成Shaker型K+通道蛋白的保守核心结构域,在植物应对非生物胁迫时起到关键作用。本研究采用西北旱区典型盐生植物盐生草作为研究材料,基于课题组前期盐生草根系盐胁迫转录组学数据分析结果,筛选并克隆得到耐盐基因HgAKR6C。HgAKR6C基因蛋白质编码区(CDS)全长951 bp,共编码氨基酸317个。系统发育进化树分析表明,HgAKR6C与拟南芥中AtAKR6C1基因亲缘关系最近。亚细胞定位表明该基因可能主要定位于细胞质和细胞核中。qRT-PCR结果表明HgAKR6C在盐处理24 h时表达量达到峰值。构建酵母异源表达载体转化缺陷型菌株发现,HgAKR6C基因可能参与Na+的外排和介导K+的吸收。综上所述,HgAKR6C具有调节盐生草耐盐性的功能,而盐生草根系耐盐基因HgAKR6C的调控机制还需进一步的研究验证。

关键词：盐生草 HgAKR6C 基因克隆耐盐调控机制

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

盐生草AKR基因家族成员的鉴定及根系盐胁迫响应基因HgAKR42639的耐盐分析

引用

草业学报 2024年第7期33卷 68-83页

作者：张震欢姚立蓉汪军成司二静张宏杨轲马小乐孟亚雄王化俊李葆春甘肃农业大学省部共建干旱生境作物学国家重点实验室甘肃省作物遗传改良与种质创新重点实验室甘肃兰州730070 甘肃农业大学生命科学技术学院甘肃兰州730070 甘肃农业大学农学院甘肃兰州730070

为探究盐生草AKR基因家族的生物学功能和根系盐胁迫响应基因HgAKR42639的耐盐性,基于盐生草全长转录组测序鉴定醛酮还原酶基因(AKRs),采用生物信息学方法分析盐生草AKRs编码的蛋白质序列特性,并在200 mmol·L^(-1)NaCl胁迫0、6、12、24... 详细信息

为探究盐生草AKR基因家族的生物学功能和根系盐胁迫响应基因HgAKR42639的耐盐性,基于盐生草全长转录组测序鉴定醛酮还原酶基因(AKRs),采用生物信息学方法分析盐生草AKRs编码的蛋白质序列特性,并在200 mmol·L^(-1)NaCl胁迫0、6、12、24和48 h处理下,测定盐生草幼苗根系和转HgAKR42639基因拟南芥的目的基因表达量、生理指标和钠钾离子含量。结果表明:从盐生草转录组中鉴定出23个HgAKRs,编码的氨基酸数量在165~664 aa,亚细胞定位预测主要在细胞质中,AKR蛋白保守结构域高度相似,具有3个motif,启动子顺式作用元件分析存在核心元件、增强元件和胁迫响应元件;qRT-PCR结果显示HgAKR42639基因相对表达量在盐生草根系和拟南芥中均先上升后下降,24 h两者的表达量达到峰值;随着盐胁迫时间的增长两者的过氧化氢酶(CAT)、过氧化物酶(POD)、超氧化物歧化酶(SOD)活性和脯氨酸含量呈上升趋势,丙二醛(MDA)和可溶性蛋白含量呈下降趋势,在24 h达到最低;Na^(+)和K^(+)含量测定结果显示,两者于24 h盐胁迫处理下Na^(+)含量下降,K^(+)/Na^(+)达到最大值。综上所述,本研究获得了盐生草AKR家族基因,为后续研究盐生草AKR基因响应盐胁迫的分子机制提供理论依据;以期为进一步验证HgAKR42639基因的耐盐性奠定基础。

关键词：盐生草 AKR基因家族生物信息学分析盐胁迫

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Laser tracking leader-follower automatic cooperative navigation system for UAVs

引用

International Journal of Agricultural and Biological Engineering 2022年第2期15卷 165-176页

作者： Rui Ming Zhiyan Zhou Zichen Lyu Xiwen Luo le Zi Cancan Song Yu zang Wei Liu Rui Jiang College of Engineering South China Agricultural University/Guangdong Laboratory for Lingnan Modern AgricultureGuangzhou 510642China College of Computer and Control Engineering Minjiang University/Fujian Provincial Key Laboratory of Information Processing and Intelligent ControlFuzhou 350108China Guangdong Provincial Key Laboratory for Agricultural Artificial Intelligence(GDKL-AAI) Guangzhou 510642China Guangdong Engineering Research Center for Agricultural Aviation Application(erCAAA) Guangzhou 510642China Key Laboratory of Key Technology on Agricultural Machine and Equipment South China Agricultural UniversityMinistry of Education of P.R.ChinaGuangzhou 510642China

Currently,small payload and short endurance are the main problems of a single UAV in agricultural applications,especially in large-scale *** is one of the important methods to solve the above problems of UAVs by improving operation efficiency through multi-UAV cooperative *** study proposed a laser tracking leader-follower automatic cooperative navigation system for *** leader in the cluster fires a laser beam to irradiate the follower,and the follower performs a visual tracking flight according to the light spot at the relative position of the laser tracking *** on the existing kernel correlation filter(KCF)tracking algorithm,an improved KCF real-time spot tracking method was *** with the traditional KCF tracking algorithm,the recognition and tracking rate of the optimized algorithm was increased from 70%to 95%in indoor environment,and was increased from 20%to 90%in outdoor *** navigation control method was studied from two aspects:the distance coordinate transformation model based on micro-gyroscope and navigation control *** error of spot position was reduced from the maximum(3.12,−3.66)cm to(0.14,0.12)cm by correcting the deviation distance of the spot at different angles through a coordinate correction *** image coordinate conversion model was established for a complementary metal-oxide-semiconductor(CMOS)camera and laser receiving device at different mounting *** laser receiving device was divided into four regions,S0-S3,and the speed of the four regions is calculated using an uncontrollable discrete Kalman *** outdoor flight experiments of two UAVs were carried out outdoors using this *** experiment results show that the average flight error of the two UAVs on the X-axis is 5.2 cm,and the coefficient of variation is *** average flight error on the Z-axis is 7.3 cm,and the coefficient of variation is *** study demonstrated the possibility

关键词： two-UAVs cooperative visual navigation laser tracking

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Factor-κB Signaling Pathway Constitutively Activated in Esophageal Squamous Cell Carcinoma Cell Lines and Inhibition of Growth of Cells by Small Interfering RNA

引用

Acta Biochimica et Biophysica Sinica 2006年第5期38卷 318-326页

作者： Fang TIAN Wei-Dong zang Wei-Hong HOU Hong-Tao LIU le-Xun XUE Laboratory for Cell Biology,Medical College,Zhengzhou University,Zhengzhou 450052,China Laboratory for Cell Biology Medical College Zhengzhou UniversityZhengzhou 450052 China

Although constitutive nuclear factor(NF)-kB activation has been reported in many humantumors,the role of the NF-kB pathway in esophageal squamous cell carcinoma(ESCC)has not been *** this study,NF-kB pathway in two ESCC cell lines was investigated using immunocytochemistry,Westernblot and reverse transciiption-polymerase chain *** activation of NF-kB DNA binding was determinedby electrophoretic mobility-shift *** interference was used to specifically inhibit the expression *** of cells Was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide *** results showed that p50,p65,IkBα,p-IkBα and IkB kinase β were expressed and mainly localized in *** transcription-polymerase chain reaction results showed the constitutive expressions ofp50,p65 and IkBα mRNA in the two ESCC cell ***,the nuclear extracts revealed that p50and p65 translocated to the nucleus had DNA-binding ***,small interfering RNA of p65 decreasedthe expression of p65,and the viability of ceils transfected with p65 small interfering RNA was significantlysuppressed at the same concentration of 5-fluorouracil(Pere was the constitutively activated NF-kB signaling pathway in the ESCC *** interference targeting at p65 increased the sensitivity of the ESCC cell lines to 5-fluorouracil,suggesting that NF-kB might be a good target for cancer treatment.

关键词： NF-κB RNA interference esophageal squamous cell carcinoma IκBα IκBα kinase

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

黄土高原彬长矿区土壤侵蚀特征及其与环境变化的关系

引用

农业工程学报 2024年第5期40卷 158-167页

作者：李朋飞黄霖霖臧宇哲胡晋飞张晓晨白晓姚顽强西安科技大学测绘科学与技术学院西安710054 Department of Geography Durham UniversityDurham DH13 LEUK

黄土高原矿区煤炭产量占全国70%以上,大规模开采活动导致区域内生态环境退化与土壤侵蚀加剧。然而,当前鲜有矿区土壤侵蚀时空特征及其与环境变化关系的定量研究,限制了煤矿区土地复垦与生态修复进展。为了探究矿区土壤侵蚀特征及其与环... 详细信息

黄土高原矿区煤炭产量占全国70%以上,大规模开采活动导致区域内生态环境退化与土壤侵蚀加剧。然而,当前鲜有矿区土壤侵蚀时空特征及其与环境变化关系的定量研究,限制了煤矿区土地复垦与生态修复进展。为了探究矿区土壤侵蚀特征及其与环境变化的关系,为黄土高原煤矿区生态环境治理提供理论指导,该研究以彬长矿区为研究区,利用修订的通用土壤流失方程(revised universal soil loss equation,RUSle)分别模拟了矿区全区2003—2019年及沉陷区2014—2019年土壤侵蚀速率,探究了矿区全区及沉陷区土壤侵蚀特征,定量研究了降雨、地形和植被对土壤侵蚀的影响。结果表明:1)2003—2019年间,彬长矿区土壤侵蚀速率整体呈显著上升趋势(P<0.05),年份间差异较大,2003年土壤侵蚀最为严重,侵蚀速率为85.56 t/(hm~2·a),2009年侵蚀程度最低,侵蚀速率为15.54 t/(hm^(2)·a)。微度、轻度侵蚀主要分布于城区、黄土塬和河流阶地等平坦地区,其空间分布在不同年份间基本保持一致,其余侵蚀类型主要分布于煤矿开采区、沟壑区及河道周边,且侵蚀强度空间异质性较大。2)2014—2019年间矿区全区及沉陷区土壤侵蚀速率表现出明显的季节周期性变化。春秋季节土壤侵蚀强度多表现为微度、轻度侵蚀,冬季侵蚀速率接近于0,夏季土壤侵蚀速率为一年中最高,是矿区水土流失治理的重点时段。3)彬长矿区土壤侵蚀速率与降雨量呈极显著正相关(P<0.01),沉陷区土壤侵蚀速率与降雨量、沉陷量及植被覆盖度均呈极显著正相关(P<0.01),降雨量是土壤侵蚀的主要影响因子,且开采沉陷加剧了土壤侵蚀,沉陷区的沉陷量不同,土壤侵蚀程度也不同。该研究方法探明了矿区的土壤侵蚀变化规律及环境变化对土壤侵蚀的影响,可为黄土高原煤矿区土壤侵蚀防治和生态环境恢复提供决策支持和科学依据。

关键词：土壤矿区侵蚀黄土高原沉陷环境因子 RUSle模型

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：