检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

彩叶桂扦插技术研究

林业勘察设计 2024年第2期44卷 10-12页

作者：陈江海苏朝强黄云鹏李俊楠漳平市林业局福建漳平364400 福建省林业科学研究院福建福州350012

对消毒后的闽台桂魁、闽农桂冠、朝阳金钻3个品种的彩叶桂插穗通过不同方式施用生根剂,结果表明,用重茬地菌灵500倍液消毒处理的彩叶桂插穗,其扦插生根率均比对照有明显提高,提高值均达18%以上;分别采用浸泡、灌溉、喷施3种方式施用根... 详细信息

对消毒后的闽台桂魁、闽农桂冠、朝阳金钻3个品种的彩叶桂插穗通过不同方式施用生根剂,结果表明,用重茬地菌灵500倍液消毒处理的彩叶桂插穗,其扦插生根率均比对照有明显提高,提高值均达18%以上;分别采用浸泡、灌溉、喷施3种方式施用根太阳生根剂处理插穗,3个品种彩叶桂扦插生根率、生根数较对照均有显著提高,其中采用浸泡方式施用根太阳生根剂处理插穗,3个品种彩叶桂扦插生根率和生根数影响效果均最佳。

关键词：彩叶桂生根剂生根率生根数

Sedimentology and Chronology of Paleogene Coarse Clastic Rocks in East-Central Tibet and Their Relationship to Early Tectonic Uplift

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2007年第3期81卷 398-408页

作者： ZHOU Jiangyu WANG jianghai K. H. BRIAN A. YIN M. S. MATTHEW Faculty of Earth and Resources China University of Geosciences Wuhan Hubei 430074 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong 510640 China Food Engineering Research Center of the Ministry of Education/State Key Laboratory of Biocontrol College of Life Sciences Sun Yat-Sen University Guangzhou Guangdong 510275 China Department of Earth and Space Sciences University of California Los Angeles CA 90095 USA

A systematic sedimentological and chronological study of typical Paleogene basins in eastcentral Tibet suggests that the depositional characteristics of extensively developed huge-bedded, purplish-red coarse clastic rocks formed in a tectonic setting of regional thrusting and strike-slipping represent a typical dry and hot subaerial alluvial fan environment formed in a proximal and rapidaccumulating sediment body in debris flows and a fan-surface braided river. Combining results from basin-fill sequences, sequences of coarse clastic rocks, fauna and sporo-pollen associations and thermochronological data, it is conduded that the coarse clastic rocks formed in the period of 54.2- 24.1 Ma, nearly coeval with the formation of Paleogene basins in the northern （Nangqen-Yushu thrust belt）, middle （Batang-Lijiang fault belt）, and disintegration of large basins in the southern （LanpingSimao fold belt） segments of Tibet. The widespread massive-bedded coarse clastic rocks, fold thrusting and strike-slip, thrust shortening, and igneous activities in the Paleogene basins of eastcentral Tibet indicate that an early diachronous tectonic uplift might have occurred in the Tibetan Plateau from Middle Eocene to Oligocene, related to the initial stage of collision of the Indian and Asian plates.

关键词： Paleogene clastic rocks tectonic uplift chronology east-central Tibet

Stable carbon isotope evidence for tracing the diet of the host Hepialus larva of Cordyceps sinensis in the Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2009年第5期52卷 655-659页

作者： CHEN Di YUAN JianPing XU ShiPing ZHOU XiaoGang ZHANG Yan XU XiaoMing ZOU ZhiWen ZHANG GuRen WANG jianghai State Key Laboratory of Bio-control College of Life SciencesSun Yat-Sen UniversityGuangzhou 510275China School of Marine Sciences Sun Yat-Sen UniversityGuangzhou 510006China State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China R&D Center Guangzhou Enenta Electrical Equipment Co.LtdGuangzhou 510635China

Two types of Hepialus larvae with different diets were distinguished in the Sejila Mountain,Tibetan Plateau based on the stable carbon isotope data of the host Hepialus larva of Cordyceps sinensis and its closely adjacent tender plant roots and humus *** I is the larva chiefly fed by soil humus,and characterized by the δ 13C values of -22.6‰ to-23.4‰,and more than -23.4‰ in its *** II is the larva chiefly fed by tender plant roots,and characterized by the δ 13C values of-24.6‰ to -27.6‰,and less than -24.6‰ in its *** result has exceeded the traditional understanding that their food sources only come from the tender plant roots,and may provide evidence for choosing cheap and high-quality foods and further establishing artificial habitats in their large-scale reproduction.

关键词： stable carbon isotopes host Hepialus larva of Cordyceps sinensis humus substances Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

中西部高校人才培养的同质化问题与路径创新

西南大学学报（社会科学版） 2021年第6期47卷 101-107,259页

作者：杜静王江海河南大学教育学部河南开封475004

中西部高校人才培养面临着理念偏差、路径依赖、评价偏差等同质化趋向的问题。以错位发展为人才培养的价值理路,中西部高校可通过调试高校生态位,谋求合理定位,依托地域资源,培育特色优势,形成差异竞争。在人才培养具体的实施路径选择中... 详细信息

中西部高校人才培养面临着理念偏差、路径依赖、评价偏差等同质化趋向的问题。以错位发展为人才培养的价值理路,中西部高校可通过调试高校生态位,谋求合理定位,依托地域资源,培育特色优势,形成差异竞争。在人才培养具体的实施路径选择中,中西部高校可利用政策优势提升资源效益,针对区域需求调整学科布局,依托地域文化开展特色教育,通过院校研究推动人才培养改革,以破解中西部高校人才培养的困境,实现人才培养的高质量发展。

关键词：中西部高校高等学校人才培养错位发展路径创新

Sedimentary geochemistry of the Cambrian-Ordovician cherts: Implication on archipelagic ocean of North Qilian orogenic belt

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2007年第11期50卷 1628-1644页

作者： du YuanSheng1,2, ZHU Jie1, GU SongZhu1, 2, XU YaJun1 & YANG jianghai1 1 Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 2 Key Laboratory of Biogeology and Environment Geology of Education Ministry, Wuhan 430074, China 1. Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China 2. Key Laboratory of Biogeology and Environment Geology of Education Ministry Wuhan 430074 China

The Caledonian North Qilian orogenic belt lies between the North China plate and the Qaidam mi-croplates, and resulted from the collision among the Qaidam microplate, mid-Qilian block and the North China plate. The orogen initiated from the rifting of the Late Proterozoic Rodinia, and then it experi-enced stages of Cambrian rift basin and Ordovician archipelagic oceanic basin, and foreland basin during Silurian to Early-Middle Devonian. The average ratios of Al/(Al+Fe+Mn), Al/(Al+Fe), δ Ce, Lan/Ybn and Lan/Cen from cherts of Cambrian Heicigou Formation are 0.797, 0.627, 1.114, 0.994 and 1.034 re-spectively. In the NAS standardized REE distribution pattern, the cherts from Xiangqianshan is slightly HREE enriched, and the cherts from Ganluci and Shiqingdong are plane. All of these features indicated that Cambrian cherts of the Heicigou Formation originated from a continental margin rift background. On the contrary, the average ratios of Al/(Al+Fe+Mn), Al/(Al+Fe), δ Ce, Lan/Ybn, Lan/Cen of the Ordovician chert from Dakecha, Cuijiadun, Shihuigou, Laohushan, Heicigou, Maomaoshan, Bianmagou, Da-chadaban, Baiquanmen, Jiugequan and Angzanggou, are respectively 0.72, 0.58, 0.99, 1.09 and 0.96 respectively. Their NAS standardized REE distribution patterns of most Ordovician cherts are plane mode or slightly HREE enriched. The REE distribution pattern of few samples of cherts are slightly LREE enriched. Characteristics of sedimentary geochemistry and tectonic evolution demonstrated that the Cambrian-Ordovician cherts, associated with rift, oceanic, island arc and back-arc volcanic rocks, was not formed in a typical abyssal oceanic basin or mid-oceanic ridge. On the contrary, they formed in a deepwater basin of continental margin or a archipelagic ocean tectonic setting. Several Early Paleo-zoic ophiolite belts in North Qilian and adjacent periphery Qaidam microplate imply that an archipelagic ocean during Ordovician existed in the east of Pro-Tethys.

关键词： North Qilian orogenic belt,Cambrian-Ordovician,cherts sedimentary geochemistry,archipelagic ocean

Radio-frequency arbitrary waveform generation based on dispersion compensated tunable optoelectronic oscillator with ultra-wide tunability

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2017年第10期15卷 33-37页

作者： Anle Wang jianghai Wo Jin Zhang Xiong Luo Kin Xu Daoming Zhang Pengfei du and Lan Yu Microwave Photonics Center Air Force Early Warning Academy Wuhan 430019 China

Photonic generation of radio-frequency（RF） arbitrary microwave waveform with ultra-wide frequency tunable range based on a dispersion compensated optoelectronic oscillator（OEO） is proposed and experimentally demonstrated. Dispersion compensation scheme and specially designed fiber Bragg grating（FBG）-based Fabry-Perot（F-P） filters are employed in the OEO loop to realize a frequency tunable range of 3.5-45.4 GHz. An optimization process provided by the combination of an erbium-doped fiber amplifier（EDFA）and FBG is employed to improve the signal-to-noise ratio（SNR） of final RF signals. The generation of linearfrequency and phase-coded microwave waveforms, with a tunable carrier frequency ranging from 4 to 45 GHz and tuned chirping bandwidths or code rates, is experimentally demonstrated.

关键词： RF Radio-frequency arbitrary waveform generation based on dispersion compensated tunable optoelectronic oscillator with ultra-wide FBG

在线全文

学校读者我要写书评

暂无评论

新工科背景下VR在高压教学中的应用

实验科学与技术 2024年第3期22卷 112-117页

作者：耿江海林果范晓舟梁海峰刘云鹏张航华北电力大学电力工程系保定071003

实验教学的升级创新对新工科人才培养至关重要。该文针对传统高压实验危险系数较高、操作流程复杂的作业特点,提出将虚拟现实技术VR融合于高电压实验课程教学中,以高压开关柜局部放电多参量测试虚拟实验和变压器绕组变形测试虚拟实验为... 详细信息

实验教学的升级创新对新工科人才培养至关重要。该文针对传统高压实验危险系数较高、操作流程复杂的作业特点,提出将虚拟现实技术VR融合于高电压实验课程教学中,以高压开关柜局部放电多参量测试虚拟实验和变压器绕组变形测试虚拟实验为例,进行了三维场景建模,在Visual Studio中编程实现实验的交互性,搭建虚拟实验平台,开展了基于虚拟现实技术的新型高压实验教学。实践证明,有趣的VR实验方式能够充分保证实验安全性、提高实验室资源利用率、调动学生学习积极性,满足新工科背景下高电压与绝缘技术专业类专业人才培养工程训练要求。

关键词：新工科 VR技术高电压实验工程训练人才培养

Formation mechanism of in-situ volcanic reservoirs in eastern China:A case study from Xushen gasfield in Songliao Basin

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2014年第10期57卷 2998-3014页

作者： FENG ZiHui YIN ChangHai LIU JiaJun ZHU YingKang LU JiaMin LI jianghai Exploration and Development Research Institute Daqing Oilfield Company Ltd. School of Earth and Space Science Peking University

A large number of in-situ volcanic reservoirs have been discovered from the Meso-Cenozoic rift basin group in eastern *** on drilling results in combination with geological and geophysical analysis,a case study from the Early Cretaceous Xujiaweizi fault-depression shows that the formation mechanism of in-situ volcanic reservoirs is characterized by"fault-controlled body,body-controlled facies,facies-controlled reservoir,and reservoir-controlled accumulation".In other words,deep faults control the volcanic eruption type,volcanic body,and gas reservoir distribution;the volcanic body determines the spatial distribution of volcanic facies and volcanic gas reservoir size;the volcanic facies control reservoir physical properties and effective thickness of gas formation;the volcanic reservoir properties control gas reservoir type and gas *** result is useful to guiding the discovery of in-situ volcanic gas reservoirs in faulted basins in both theory and practice.

关键词： Songliao Basin in-situ volcanic reservoir volcanic eruption type volcanic facies belt volcanic eruption cycle

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

复合材料补片加固含椭圆孔钢板刚度分析

复合材料学报 2010年第6期27卷 218-224页

作者：章向明陈礼威杜奎范江海海军工程大学理学院力学系武汉430033 海军工程大学科研部武汉430033

针对复合材料补片加固损伤钢板的受力特点,建立三维弹性力学模型,对复合材料补片双面加固轴向受拉平板进行了应力和变形分析。研究了粘贴界面的剪应力分布规律,钢板和补片内轴向拉力的分布规律,分析了加固后平板相对加固前的相对刚度。... 详细信息

针对复合材料补片加固损伤钢板的受力特点,建立三维弹性力学模型,对复合材料补片双面加固轴向受拉平板进行了应力和变形分析。研究了粘贴界面的剪应力分布规律,钢板和补片内轴向拉力的分布规律,分析了加固后平板相对加固前的相对刚度。研究了含椭圆孔钢板经复合材料补片加固后相对加固前以及相对完好钢板的刚度。结果表明,复合材料胶接修补含孔钢板的刚度随着补片厚度的增加而增加,且增强的趋势逐渐趋于缓和。当补片层数大于5层后,单纯依靠增加补片的厚度并不能有效提高修复效果。解析法与有限元法的计算结果及试验结果吻合得比较好。

关键词：船舶结构钢结构损伤复合材料贴片修补加固解析解