检索结果-南通市图书馆

Preparation and characterization of carbon nano-sheet powders

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2008年第1期5卷 79-82页

作者： yang wubao Zhao Zhen Fang Songhua Wang Yong yang Size Lin Li School of Electromechanical Engineering China University of Petroleum Beijing 102249 China School of Chemical Science and Engineering China University of Petroleum Beijing 102249 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China

Carbon nanosheet films were deposited on A1 substrates by using plasma assisted chemical vapor deposition （PACVD） technique. And after being peeled off from A1 substrates, carbon nanosheet powders （CNSPs） were obtained. In Raman spectrum of carbon film, there was a strong and broadened peak at about 1,580 cm^-1, indicating a carbon diamond-like film. Atomic force microscope image showed that the carbon diamond-like film had a grain size less than 100 nm, and its surface roughness Ra was 17.95 nm in an area of 5×5 μm^2. The CNSPs were irregular sheets with curly edges and a length of several micrometers to several hundreds of micrometers. The BET surface area of CNSPs was 6.66 m^2/g with no micro-pore present, which was confirmed by N2 adsorption-desorption characterization. In the adsorption testing, when the relative pressure p/po was higher than 0.3, the adsorption behavior did not follow the Langmuir equation. The addition of CNSPs to carbon black （catalyst support） could improve hydrodesulfurization performance of carbon supported Ni-W catalysts for diesel oil.

关键词： Plasma assisted chemical vapor deposition carbon nanosheet powder N2 adsorption/desorption hydrodesulfurization

内蒙古北山造山带北带晚古生代地层时空格架的建立

在线全文

学校读者我要写书评

暂无评论

地质通报 2020年第9期39卷 1367-1388页

作者：卫彦升闫涛杨五宝李拯宇山西省地质调查院山西太原030006

内蒙古北山造山带是研究中亚造山带时空演化的重要地区,也是天山造山带与兴蒙造山带对接的关键地区。长期以来,由于工作条件的制约,该地区研究程度相对薄弱,晚古生代地层格架混乱且矛盾。根据近年来在该地区完成的1∶5万区调成果,通过... 详细信息

内蒙古北山造山带是研究中亚造山带时空演化的重要地区,也是天山造山带与兴蒙造山带对接的关键地区。长期以来,由于工作条件的制约,该地区研究程度相对薄弱,晚古生代地层格架混乱且矛盾。根据近年来在该地区完成的1∶5万区调成果,通过晚古生代地层的区域分布、物质组成、时代归属等方面的系统梳理,并结合构造-岩浆配置和造山带结构的认识,重新建立了内蒙古北山地区黑鹰山地层分区晚古生代地层格架。重新划分和厘定出志留纪-泥盆纪雀儿山群红尖山组、碎石山组、清河沟组和圆锥山组,石炭纪绿条山组、白山组及二叠纪双堡塘组、金塔组,明确了雀儿山群为雀儿山陆缘弧环境形成的火山-沉积组合,包括晚志留世-中泥盆世红尖山组岛弧火山岩和碎石山组-清河沟组弧内盆地碎屑岩组合,以及晚泥盆世圆锥山组岛弧火山岩组合;石炭纪绿条山组、白山组形成于沟-弧-盆体系中,以红石山-百合山结合带为界南北具有明显的差异性:绿条山组北区为低成熟度的弧间盆地北缘滨浅海碎屑岩沉积,南区为成熟度较高的弧间盆地南缘滨浅海-半深海碎屑岩沉积;白山组北区为晚石炭世继承岛弧火山组合,南区为石炭纪陆缘弧火山组合。双堡塘组和金塔组为后碰撞-碰撞后的裂谷盆地沉积,具有下部碎屑岩、上部火山岩的二元结构,化石组合指示其时代为早-中二叠世。

关键词：北山造山带红石山-百合山结合带沟-弧-盆体系陆缘岩浆弧雀儿山群

一种新型硅碳复合薄膜材料作为锂离子二次电池负极材料的研究(英文)

在线全文

学校读者我要写书评

暂无评论

北京大学学报（自然科学版） 2006年第S1期42卷 39-43页

作者：赵中琴吴中友杨武保刘鑫江卫军中信国安盟固利新能源科技有限公司北京102200 石油大学机电学院北京102249

利用气相沉积技术,制备了SixCy层和C层相间的硅碳复合薄膜材料。XRD测试和Raman光谱测试表明,该硅碳复合薄膜材料具有纳米微晶结构。电化学性能测试表明,该SixCy/C复合薄膜材料,具有较低的充放电平台(0·5V以下),对应的首次放电容量达12... 详细信息

利用气相沉积技术,制备了SixCy层和C层相间的硅碳复合薄膜材料。XRD测试和Raman光谱测试表明,该硅碳复合薄膜材料具有纳米微晶结构。电化学性能测试表明,该SixCy/C复合薄膜材料,具有较低的充放电平台(0·5V以下),对应的首次放电容量达1200mAh/g以上,经过200次循环,容量保持率高于85%。SixCy/C复合薄膜材料性能的改善,主要原因可能源于活性材料Si中的缓冲骨架以及碳的共同作用,它们的存在改善了复合材料的导电性能,也有效缓冲了在充放电过程中活性组分Si所导致的体积变化。

关键词： SixCy/C复合薄膜材料气相沉积负极材料锂离子二次电池负极材料

对内蒙古北山造山带洋-陆转换认识的新思考——来自大红山南泥盆纪弧花岗岩的证据

在线全文

学校读者我要写书评

暂无评论

地质通报 2020年第9期39卷 1341-1366页

作者：闫涛辛后田卫彦升杨五宝李拯宇山西省地质调查院山西太原030006 中国地质调查局天津地质调查中心天津300170 华北地质科技创新中心天津300170

报道了红石山-百合山蛇绿构造混杂岩带南侧大红山地区发现的一套泥盆纪弧花岗岩,并论述其地质特征、岩石学、地球化学、年代学及其岩石成因和构造背景。该套弧花岗岩由英云闪长岩、花岗闪长岩及石英二长岩组成,整体经历了强烈的区域动... 详细信息

报道了红石山-百合山蛇绿构造混杂岩带南侧大红山地区发现的一套泥盆纪弧花岗岩,并论述其地质特征、岩石学、地球化学、年代学及其岩石成因和构造背景。该套弧花岗岩由英云闪长岩、花岗闪长岩及石英二长岩组成,整体经历了强烈的区域动热变质作用,普遍发育透入性的新生面理构造。据岩石地球化学特征,该套弧花岗岩可分为钠质的T 1G 1(英云闪长岩+花岗闪长岩)和钾质的QM(石英二长岩),T 1G 1具有高铝型TTG的特征(Al 2O 3平均15.22%,大于15%),QM则为一套高钾钙碱性系列岩石,属于低Sr高Yb的浙闽型花岗岩(Sr含量平均121.64×10-6,Yb含量平均2.95×10-6)。二者均具有轻稀土元素和大离子亲石元素明显富集、重稀土元素和高场强元素明显亏损,以及非常明显的“TNT”异常(Nb、Ta、Ti亏损)特征,指示该套弧花岗岩形成于成熟度较高的岛弧背景。锆石U-Pb测年结果显示,这套弧花岗岩的侵位时代为364~399 Ma。结合区域地质背景和时空演化配置,认为该套弧花岗岩为北山造山带雀儿山岛弧(D)的残留。该发现为北山造山带北带古生代弧-盆演化体制的研究提供了新的证据和线索。

关键词：北山造山带弧花岗岩泥盆纪大红山雀儿山岛弧

内蒙古北山造山带小红山TTG岩石锆石U-Pb年龄、地球化学特征及其对百合山构造带性质的制约

在线全文

学校读者我要写书评

暂无评论

地质通报 2020年第9期39卷 1404-1421页

作者：杨五宝闫涛张永卫彦升李拯宇山西省地质调查院山西太原030006 中国地质调查局天津地质调查中心天津300170 华北地质科技创新中心天津300170

分布于内蒙北山地区小红山南一带的晚石炭世花岗岩,是由英云闪长岩(T 1)、花岗闪长岩(G 1)和奥长花岗岩(T 2)组成的一套TTG岩石组合。该套组合具有富硅、富钠、低铝的地球化学特征,稀土元素总量偏低,∑REE=27.86×10-6~104.56×10-6,轻... 详细信息

分布于内蒙北山地区小红山南一带的晚石炭世花岗岩,是由英云闪长岩(T 1)、花岗闪长岩(G 1)和奥长花岗岩(T 2)组成的一套TTG岩石组合。该套组合具有富硅、富钠、低铝的地球化学特征,稀土元素总量偏低,∑REE=27.86×10-6~104.56×10-6,轻稀土元素富集,LREE/HREE值为4.71~22.76,(La/Yb)值为4.78~43.18,δEu为0.62~1.72,稀土元素配分曲线为右倾型,微量元素总体表现为富集大离子亲石元素(LILEs),亏损高场强元素(HFSEs),且具有明显的Nb、P、Ti负异常,Y、Yb含量低。利用LA-ICP-MS锆石U-Pb同位素测定技术,测得该套TTG组合酸性侵入体中花岗闪长岩、英云闪长岩、奥长花岗岩206 Pb/238 U年龄加权平均值分别为315.6±1.6 Ma、310.8±1.4 Ma、305±1.9 Ma,形成于晚石炭世。研究认为,小红山晚石炭世TTG花岗岩组合具有陆缘弧花岗岩的成因特点,形成于石炭纪百合山弧间洋盆向南侧陆缘消减过程中洋壳俯冲板片的部分熔融,这套与百合山蛇绿岩同期形成的明水陆缘弧的发育,指示了百合山构造带形成于弧盆体系的演化阶段。

关键词： TTG 锆石U-Pb年龄陆缘弧洋陆转换晚石炭世北山造山带百合山构造带

在线全文

学校读者我要写书评

暂无评论

华北板块中部中生代构造演化——以山西为例

吉林大学学报（地球科学版） 2022年第4期52卷 1127-1152页

作者：卫彦升冯志强闫涛杨五宝段春森山西省地质调查院太原030006 太原理工大学矿业工程学院太原030024

山西省位于华北板块中部,其地质发展过程与华北克拉通息息相通,特别是中生代地质演化事件更直观地反映了华北克拉通的演化特征。受山西省基础地质工作研究程度和工作方法、手段的制约,对于山西省中生代地质演化事件序列厘定的精细程度... 详细信息

山西省位于华北板块中部,其地质发展过程与华北克拉通息息相通,特别是中生代地质演化事件更直观地反映了华北克拉通的演化特征。受山西省基础地质工作研究程度和工作方法、手段的制约,对于山西省中生代地质演化事件序列厘定的精细程度还较为薄弱,对重要的地质演化时间节点较为模糊或认识有偏颇之处。本文在充分收集和分析前人资料,特别是收集了近年来山西省内大量的中生代岩浆岩同位素测年数据和地球化学资料的基础上,通过对该时期地层、构造、岩浆、矿产的综合研判,对山西省中生代地质演化事件进行了重建。笔者认为山西省中生代地质演化可划分为:早三叠世—晚三叠世早期挤压阶段(252~220 Ma)、晚三叠世晚期—早侏罗世早期强烈伸展阶段(220~180 Ma)、早侏罗世晚期—中侏罗世弱伸展阶段(180~160 Ma)、晚侏罗世—早白垩世早期挤压阶段(160~130 Ma)、早白垩世中期—晚白垩世早期伸展阶段(130~86 Ma)和晚白垩世中—晚期弱挤压阶段(86~65 Ma)等6个阶段,其形成的构造背景和构造演化及重要的构造机制转换与华北板块周边古亚洲洋、古特提斯洋和古太平洋三大构造域先后或同时作用有关,应为上述三大构造域远程效应叠加的结果。

关键词：山西省中生代构造演化华北板块中部同位素测年地球化学

Vibration properties of Paulownia wood for Ruan sound quality using machine learning methods

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第5期35卷 216-222页

作者： yang yang College of Art and Design Harbin UniversityHarbin 150076People’s Republic of China College of Mechanical and Electrical Engineering Northeast Forestry UniversityHarbin 150040People’s Republic of China

As an important material for manufacturing resonant components of musical instruments,Paulownia has an important influence on the sound quality of *** this paper,a model for evaluating the sound quality of Ruan based on the vibration characteristics of wood is developed using machine learning ***,the selection of materials for Ruan manufacturing relies primarily on manually weighing,observing,striking,and listening by the instrument *** in scientific theory have hindered the quality of the finished *** this study,nine Ruans were manufactured,and a prediction model of Ruan sound quality was proposed based on the raw material information of *** of a total of 180 data sets,145 and 45 sets were chosen for training and validation,*** this paper,typical correlation analysis was used to determine the correlation between two single indicators in two adjacent pairwise combinations of the measured objects in each stage of the production process in *** vibra-tion characteristics of the wood were tested,and a model for predicting the evaluation of Ruan’s acoustic qualities was developed by measuring the vibration characteristics of the resonating plate *** acoustic quality of the Ruan sound board wood was evaluated and predicted using machine learning model generalized regression neural *** results show that the prediction of Ruan sound quality can be achieved using Matlab simulation based on the vibration characteristics of the soundboard *** the model-predicted values were compared with the tradi-tional predicted results,it was found that the generalized regression neural network had good performance,achieving an accuracy of 93.8%which was highly consistent with the experimental *** was concluded that the model can accurately predict the acoustic quality of the Ruan based on the vibration performance of the soundboards.

关键词： Sound quality Wood vibration performance Paulownia wood Machine learning methods

Overview of radar detection methods for low altitude targets in marine environments

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2024年第1期35卷 1-13页

作者： yang Yong yang Boyu School of Electronic Science National University of Defense TechnologyChangsha 410073China

In this paper,a comprehensive overview of radar detection methods for low-altitude targets in maritime environments is presented,focusing on the challenges posed by sea clutter and multipath *** performance of the radar detection methods under sea clutter,multipath,and combined conditions is categorized and summarized,and future research directions are outlined to enhance radar detection performance for low-altitude targets in maritime environments.

关键词： radar sea clutter multipath scattering detection low altitude target

Fresh-Keeping Decision and Coordination of Fresh Agricultural Product Supply Chain Considering Carbon Cap-and-Trade under Different Dominance

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2024年第1期33卷 30-51页

作者： yang yang Guanxin Yao China Institute for Agricultural Equipment Industrial Development Jiangsu UniversityZhenjiang212013China Jiangsu Modern Logistics Research Base Yangzhou UniversityYangzhou225009China

In the context of low carbon,this paper discussed the impact of the carbon cap-and-trade policy on the fresh-keeping decision-making of two-echelon fresh agricultural product supply chains under different dominance,and designed cost-sharing contracts to coordinate the supply chain of fresh agricultural products dominated by suppliers and retailers *** results showed that:dominance has no effect on the fresh-keeping decision and total revenue of fresh agricultural product supply chain,but it affects the internal income distribution,and dominance does not always bring more benefits;the implementation of carbon cap-and-trade reduces the fresh-keeping decision-making of fresh agricultural products supply chain and reduces the free-rider income of followers;the role of higher carbon trading price is twofold,which not only brings about the speculation of leading enterprises,but also promotes the application of low-carbon technologies;consumers’high preference for freshness,low-cost and high-efficiency low-carbon technology are all conducive to improving the fresh-keeping efforts and benefits of the supply chain;cost-sharing contracts can coordinate the supply chain of fresh agricultural products.

关键词： Dominant power carbon cap-and-trade policy fresh agricultural product supply chain fresh-keeping decision-making