检索结果-南通市图书馆

Effects of forward-flight speed on plume flow and infrared radiation of IRS-integrating helicopter

Chinese Journal of Aeronautics 2022年第3期35卷 155-168页

作者： zongyao yang Jingzhou ZHANG Yong SHAN Key Laboratory of Thermal Management and Energy Utilization of Aircraft of Ministry of Industry and Information Technology College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

To address deeper understandings about the aero-thermal performance of an integrating infrared suppressor under more realistic situations,a numerical investigation is motivated in the current study,concerning the effects of forward-flight speed on exhaust plume flow and infrared radiation of the Infrared Suppressor-integrating(IRS-integrating)helicopter,wherein the forward-flight speed is changed from 0 m/s(hover state)to 100 m/s,while both the engine exhaust parameters and the main-rotor operation parameters remains unchanged during different forward-flight *** results show that the interaction between forward-flight flow and downwash flow alters the exhaust plume development and the internal flow inside the IRS-integrating rear fuselage more complicatedly,tightly dependent on the forward-flight *** particular concern is the situation where the forward-flight flow has nearly the same level as the downwash flow,the hot mixing flow could possibly interacts with the helicopter rear fuselage to play a local heating *** the increase of forward-flight speed,the ejection coefficient is generally increased and the average exhaust temperature of mixing flow is decreased,leading to a reduction of the infrared radiation intensity of exhaust plume in 3–5 lm ***,the influence of forward-flight speed on the overall infrared radiation intensity of IRS-integrating helicopter is conjectured not monotonous due to the complicated interaction between forward-flight flow and downwash *** high-speed forward-flight states,the overall infrared radiation intensity of the IRS-integrating helicopter in 3–5 lm band is reduced with the increase of forward-flight *** respect to 3–5 lm band,the forward-flight speed has little effect on the infrared radiation in 8–14 lm band.

关键词： Exhaust plume Forward-flight speed Helicopter Infrared radiation Integrating infrared suppressor

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

New 40Ar/39Ar Data of Gold Mineralization in the Ailaoshan Gold Belt, Yunnan Province, China

引用

Acta Geologica Sinica(English Edition) 2020年第1期94卷 210-211页

作者： yang zongyao HU Guyue ZHAO Xiaoyan Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 610059China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing China

Objective“Orogenic gold deposits,”which account for 30%of global gold resources(Frimmel and Hennigh,2015),is one of the most important types of gold deposits in the *** kind of gold deposit is supposed to have spatial and temporal distribution association with the accretionary orogenic *** Ailaoshan Gold Belt,where there are many large orogenic gold deposits including Jinchang,Daping,Laowangzhai,Donggualing,and Changan,contribute substantially to Chinese gold *** Himalayan orogen and Ailaoshan Orogen,both have experienced the early accretionary orogenesis and the subsequent collisional orogenesis are one of the biggest orogenic belts on the *** mineralization can be divided into that the earlier Yarlung Zangbo suture zone(59–44 Ma)and the later Ailaoshan Orogen(35–26 Ma)(Li et al.,2017),based on previous geochronological *** order to find out if there are any connections between these two gold events,we present 40Ar/39Ar data of hydrothermal sericite collected from the Xiachahe gold deposit in the northwest of the Ailaoshan Gold ***,our new geochronology data regards this as a continuous gold mineralization event resulting from the India–Eurasia collision.

关键词： Ar Data of Gold Mineralization in the Ailaoshan Gold Belt New Yunnan Province

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

Precision integration of grating-based polarizers onto focal plane arrays of near-infrared photovoltaic detectors for enhanced contrast polarimetric imaging

引用

International Journal of Extreme Manufacturing 2021年第3期3卷 95-102页

作者： Bo Feng Yifang Chen Duo Sun zongyao yang Bo yang Xue Li Tao Li Nanolithography and Application Research Group State Key Laboratory of ASIC and SystemSchool of Information Science and TechnologyFudan UniversityShanghai 200433People’s Republic of China State Key Laboratories of Transducer Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083People’s Republic of China

Polarimetric imaging enhances the ability to distinguish objects from a bright background by detecting their particular polarization status,which offers another degree of freedom in infrared remote ***,to scale up by monolithically integrating grating-based polarizers onto a focal plane array(FPA)of infrared detectors,fundamental technical obstacles must be overcome,including reductions of the extinction ratio by the misalignment between the polarizer and the detector,grating line width fluctuations,the line edge roughness,*** paper reports the authors’latest achievements in overcoming those problems by solving key technical issues regarding the integration of large-scale polarizers onto the chips of FPAs with individual indium gallium arsenide/indium phosphide(In Ga As/In P)sensors as the basic building *** and photovoltaic chips with divisions of the focal plane of 540×4 pixels and 320×256 superpixels have been successfully *** imaging with enhanced contrast has been *** progress made in this work has opened up a broad avenue toward industrialization of high quality polarimetric imaging in infrared wavelengths.

关键词： polarimetric imaging grating based polarizer InGaAs/InP focal plane array nanofabrication

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

Mineral Geochemistry of Apatite in the Jiama PorphyrySkarn Deposit,Tibet and its Geological Significance

引用

Acta Geologica Sinica(English Edition) 2024年第2期98卷 399-415页

作者： yang yang TANG Juxing ZHANG Zebin TANG Pan XIE Fuwei RAN Fengqin yang zongyao yang Huaichao BAI Yun SUN Miao QI Jing School of Earth Sciences Chengdu University of TechnologyChengdu 610059China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China The Key Laboratory of the Ministry of Education on Solid Waste Treatment and Recycling School of Environment and ResourceSouthwest University of Science and TechnologyMianyangSichuan 621010China Chengdu Surveying Geotechnical Research Institute Co. Ltd.of MCCChengdu 610023China Sichuan Tianfu Mining Investment Co. Ltd.Chengdu 610055China Sichuan Institute of Comprehensive Geological Survey Chengdu 610081China

The Jiama deposit,a significant porphyry-skarn-type copper polymetallic deposit located within the Gangdese metallogenic belt in Tibet,China,exemplifies a typical porphyry metallogenic ***,the mineral chemistry of its accessory minerals remains under-examined,posing challenges for resource assessment and ore *** electron microprobe analysis and LA-ICP-MS analysis,this study investigated the geochemical characteristics of apatite in ore-bearing granite and monzogranite porphyries,as well as granodiorite,quartz diorite,and dark diorite porphyries in the *** also delved into the diagenetic and metallogenic information from these geochemical *** findings include:(1)The SiO_(2) content,rare earth element(REE)contents,and REE partition coefficients of apatite indicate that the dark diorite porphyry possibly does not share a cogenetic magma source with the other four types of porphyries;(2)the volatile F and Cl contents in apatite,along with their ratio,indicate the Jiama deposit,formed in a collisional setting,demonstrates lower Cl/F ratios in apatite than the same type of deposits formed in a subduction environment;(3)compared to non-ore-bearing rock bodies in other deposits formed in a collisional setting,apatite in the Jiama deposit exhibits lower Ce and Ga *** might indicate that rock bodies in the Jiama deposit have higher oxygen ***,the marginal variation in oxygen fugacity between ore-bearing and non-ore-bearing rock bodies within the deposit suggests oxygen fugacity may not serve as the decisive factor in the ore-hosting potential of rock bodies in the Jiama deposit.

关键词： apatite metallogenesis mineral geochemistry porphyry Jiama Tibet

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

Genesis of the Sinongduo Carbonate-hosted Pb-Zn-Ag Deposit in the Central Lhasa Terrane,Tibet

引用

Acta Geologica Sinica(English Edition) 2023年第3期97卷 759-776页

作者： RAN Fengqin TANG Juxing yang zongyao DUO Ji REN Dongxing GUO Wenbo WU Xin HAO Jinyue HE Yifei SUN yang College of Earth Science Chengdu University of TechnologyChengdu 610059China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological ScienceBeijing 100037China Chengdu Surveying Geotechnical Research Institute Co. Ltd.of MCCChengdu 610023China Chengdu Engineering Corporation Limited PowerChinaChengdu 611130China New Energy Geology Team of the Hebei Coalfield Geology Bureau XingtaiHebei 054000China

The Sinongduo mining region includes two types of mineralizations:the epithermal and the carbonate-hosted PbZn-Ag *** being studied for many years,the ore formation process and genesis of the carbonate-hosted Pb-Zn-Ag deposits remain poorly *** Pb-Zn-Ag ore bodies occur as veins and are hosted by limestone and dolostone of the Permian Xiala *** sulfide mineralization substages have been identified at the Sinongduo carbonatehosted *** coupled with Cu,Co and Sn was incorporated into sphalerite as substitutions:2Zn^(2+)?Cu^(+)+In^(3+),(3n/2+1)Zn^(2+)?Co^(2+)+n In^(3+)or(2n+1)Zn^(2+)?Co^(2+)+n(Cu^(+)+In^(3+))(n>1)and 4Zn^(2+)?Sn2++2In^(3+).Sphalerite and pyrite in the mineralization stage displayδ^(34)S values in a narrow range of+5.7‰to+11.3‰,which are similar to those of Palaeocene igneous rocks,indicative of a magmatic source of *** present systematic carbon-hydrogen-oxygen isotope results that further support a magmatic source for the ore-forming fluids that were influenced by meteoric ***,the Pb isotope compositions of sulfide minerals in the Sinongduo carbonate-hosted deposit overlap with the values of coeval Linzizong volcanic rocks and are similar to those of Indian Ocean sediments,indicating upper crustal sources of *** conclude that the Sinongduo carbonate-hosted Pb-Zn-Ag deposit is a medium-to low-temperature magmatic-hydrothermal deposit related to Linzizong magmatism.

关键词： sulfur and lead isotopes sphalerite carbonate-hosted deposit Tibet India–Asia collision

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

New Discovery of the 341 Ma Gabbro at Xiongcun District in the Southern Margin of Lhasa Terrane, Tibet

引用

Acta Geologica Sinica(English Edition) 2018年第1期92卷 420-421页

作者： LANG Xinghai LIU Dong DENG Yulin TANG Juxing XIE Fuwei yang zongyao CUI Zhiwei WANG Xuhui LI Zhijun ZHANG Zhong ZHANG Jinshu HUANG Yong College of Earth Sciences and MLR Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation Chengdu University of Technology Chengdu 610059 Sichuan China College of Management Science Chengdu University of Technology Chengdu 610059 Sichuan China Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong University Chengdu 611756 Sichuan China Tibet Tianyuan Minerals Exploration Co. Ltd Rikaze 857000 Tibet China College of Engineering Tibet University Lhasa 850012 Tibet China Chengdu Center of China Geological Survey Chengdu 610081 Sichuan China

Objective Lhasa terrane has recorded the geologic history conceming the formation and evolution of Paleo-Tethys and the intra-continental convergence in Qinghai-Tibet Plateau （Yin and Harrison, 2000）. Previous investigations have focused on the initial timing of the India-Asia collision and the Cretaceous-Cenozoic magmatism and sedimentation （Wang Tianyang et al., 2017）, however, there are only few studies concerning the Paleozoic evolution in Lhasa terrane. This paper mainly reports a new discovery of 341 Ma gabbro, which is located in the Xiongcun copper-gold district at the southern margin of Lhasa terrane, Tibet. As an important magmatic record during the Paleozoic evolution process of Lhasa terrane, the Early Carboniferous Xiongcun gabbro will provide new constraints for the tectonic evolution of Paleo-Tethys Ocean in the Late Devonian to Early Carboniferous.

关键词： Ma Gabbro Tibet Xiongcun District

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

C919飞机边线噪声级预测算法

引用

环境工程学报 2017年第7期11卷 4445-4452页

作者：闫国华杨宗耀中国民航大学航空工程学院天津300300

为了新飞机试飞前能获得飞机边线噪声级,缩短新飞机噪声合格审定周期,对飞机边线有效感觉噪声级预测方法进行了研究,利用飞机相关物理参数及声压公式建立了完整的飞机边界噪声级预测算法。以波音、空客、CRJ系列飞机为例,验证该算法的... 详细信息

为了新飞机试飞前能获得飞机边线噪声级,缩短新飞机噪声合格审定周期,对飞机边线有效感觉噪声级预测方法进行了研究,利用飞机相关物理参数及声压公式建立了完整的飞机边界噪声级预测算法。以波音、空客、CRJ系列飞机为例,验证该算法的有效性。控制飞机单一物理参数变化,分析各参数对飞机边线有效感觉边界噪声值的影响等级,提出降低飞机边线有效感觉噪声值的建议。将该算法应用于预测C919飞机边线噪声值,阐明了该算法在飞机噪声适航审定工作中的重要作用。

关键词：边线噪声级预测算法C919飞机声压公式有效感觉噪声级

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

承包地确权、地块规模对农户土地投资的影响:基于决策模式差异视角

引用

中国土地科学 2021年第6期35卷 48-55,94页

作者：杨宗耀纪月清南京农业大学经济管理学院江苏南京210095

研究目的:基于江苏省18县地块和地片层面调研数据,通过对比分析有机肥投资和改变用途投资,揭示承包地确权的投资效应因决策模式不同而存在的差异,并讨论地块规模在其中的调节作用。研究方法:多期双重差分法和三重差分法。研究结果:(1)... 详细信息

研究目的:基于江苏省18县地块和地片层面调研数据,通过对比分析有机肥投资和改变用途投资,揭示承包地确权的投资效应因决策模式不同而存在的差异,并讨论地块规模在其中的调节作用。研究方法:多期双重差分法和三重差分法。研究结果:(1)不同于独立决策的有机肥投资,改变用途投资决策模式有集体决策和独立决策之分;(2)承包地确权对农户有机肥投资有激励效应,对改变用途投资则表现出抑制效应;(3)对于承包经营地块,随着地块面积的扩大,确权对改变用途投资的抑制效应随之明显减弱;(4)确权通过增加土地流转和信贷可得性来影响投资的实际效果并不明显。研究结论:承包地确权通过降低土地产权风险有利于促进独立决策的投资,但也会增加集体行动失败风险和协商成本妨碍集体决策的投资,从而导致投资效应的差异。削减承包地细碎化将有助于减弱确权对集体投资的负面影响。在三权分置思想指导下,保护农户承包权益的同时,也应明确村集体在组织农户集体决策中的职责与行为规范,并积极探索有利于削减分配细碎化的土地调整新规则。

关键词：土地经济土地投资承包地确权集体决策地块规模

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

地权稳定性与农户土地投资:基于确权政策预期与落地影响差异的讨论

引用

中国土地科学 2022年第6期36卷 66-75页

作者：杨宗耀纪月清南京农业大学经济管理学院江苏南京210095

研究目的:利用江苏省18县地块层面2期调查数据,分析承包地确权政策从预期实施到落地完成各阶段对农户土地投资的影响差异,检验地权稳定性对土地投资的重要性并评估政策效果。研究方法:多期DID模型和Probit模型。研究结果:(1)确权政策对... 详细信息

研究目的:利用江苏省18县地块层面2期调查数据,分析承包地确权政策从预期实施到落地完成各阶段对农户土地投资的影响差异,检验地权稳定性对土地投资的重要性并评估政策效果。研究方法:多期DID模型和Probit模型。研究结果:(1)确权政策对承包地投资的影响存在阶段性差异,在确权预期和启动阶段表现出抑制作用,在确权落地阶段则表现出促进农户对经营的自家承包地进行投资的作用,但不会促进对转入的他人承包地的投资。(2)从地权稳定性角度来看,抑制效应源于确权推广过程中土地调整或权属界定争议引致的地权不稳定,激励效应则源于确权落地后承包权稳定性的提高。(3)如果不控制确权预期和启动起到的作用,采用通常方法进行估计会高估确权落地的投资激励效应。研究结论:保持承包地地权稳定对促进农户对经营的自家承包地的投资具有重要意义。从激励投资角度来看,在二轮承包地即将到期之际各地应抓紧研究“再延30年”的具体方案并提前公布,稳定农民的产权预期。

关键词：土地经济承包地确权地权稳定性土地投资

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

一体化红外抑制器后机身狭缝进口布置对气流组织和红外辐射特性的影响

引用

航空学报 2021年第7期42卷 128-140页

作者：杨宗耀张靖周单勇南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室南京210016

针对一体化红外抑制器后机身顶部狭缝进气口布局的精细化设计需求,提出了改变进气狭缝位置以及面积的4个方案,基于旋翼下洗气流和尾桨气流的简化模型进行了后机身内外流耦合流动传热数值研究,并运用正反射线追踪法计算得到了后机身3~5μ... 详细信息

针对一体化红外抑制器后机身顶部狭缝进气口布局的精细化设计需求,提出了改变进气狭缝位置以及面积的4个方案,基于旋翼下洗气流和尾桨气流的简化模型进行了后机身内外流耦合流动传热数值研究,并运用正反射线追踪法计算得到了后机身3~5μm波段和8~14μm波段的红外辐射强度空间分布,通过对比分析了狭缝进气口布局对一体化红外抑制器后机身气流组织和红外辐射特性的影响。结果表明:旋翼下洗气流对于机身两侧排出的热喷流掺混作用有所差异,存在尾桨气流时排气热喷流对喷口附近机身壁面的局部加热效应更显著;后机身顶部进气位置影响旋翼下洗气流的进气流量以及机身内部气流流动,进气口布置在后机身顶部外侧不利于旋翼下洗气流的导入,而进气口布置在后机身顶部内侧则导致旋翼下洗气流在混合管与机身壁面之间的局部流动较弱,使得该区域的气流温度较高;进气口面积增大虽有利于减小表面局部热点区域,却导致后机身上方的红外辐射强度有较大的增强。因此,进气口的位置和面积是重要的设计参数,合理的后机身内部气流组织可以提供有效的混合管冷却和后机身壁面热防护,改善3~5μm波段和8~14μm波段的红外辐射强度空间分布。

关键词：直升机一体化红外抑制器后机身顶部进气口气流组织红外辐射

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：