搜索结果: 1-15 共查到“理学 SEM”相关记录20条 . 查询时间(0.156 秒)
The spectral element method (SEM) on variable-resolution grids: evaluating grid sensitivity and resolution-aware numerical viscosity
spectral element method variable-resolution grids
2014/12/19
We evaluate the performance of the Community Atmosphere Model's (CAM) spectral element method on variable-resolution grids using the shallow-water equations in spherical geometry. We configure the met...
石英的SEM-CL恭硕结构及其在岩石作者：中的应用
扫描电镜—阴极发光 石英 微结构 岩石成因
2012/7/25
综述了国外扫描电镜—阴极发光（SEM-CL）成像技术在岩石学研究中的应用实例。采用阴极发光探测器和扫描电镜结合的方法对石英等矿物进行观察，可以在高放大倍数和高分辨率下获得其他方法所无法揭示的丰富的微结构信息，如暗条痕和斑块、愈合裂纹、环带、复杂剪切纹、面状结构等，这些不同的微结构成为不同类型岩石中所特有的特征，因此，对沉积岩物源示踪具有较重要的参考价值。岩浆岩及热液石英中所显示的穿插结构、溶解结构...
基于上海世博会国内游客调研数据分析,构建世界级博览会游客感知价值维度与行为意向、重游意向的结构方程模型,并进行关系验证。研究表明:(1)上海世博会国内游客感知价值包括服务价值、美感价值、效用价值、愉悦价值、感知价格、便利价值六个测量维度。(2)效用价值、服务价值、愉悦价值对游客行为意向有显著的正向影响,而美感价值、感知价格、便利价值对行为意向影响不显著。(3)效用价值、愉悦价值、服务价值、便利价值...
Identification of biogenetic calcite and aragonite using SEM
Calcite aragonite morphology geochemical difference Feigl’s staining method SEM
2009/12/7
Identification of calcite and aragonite is very important for studying different fossil or recent biomineralized skeletons. Problem occurs when scanning electron microscopy is used for studying calcit...
环糊精与SEM-25多聚准轮烷的制备及表征
环糊精 SEM-25 多聚准轮烷 包合物
2009/11/20
SEM-25与环糊精（CD，Cyclodextrin）的包合反应有选择性，可分别与α-CD和γ-CD作用形成“管型”多聚准轮烷，但与β-CD不发生作用。分别用FT-IR、XRD、1HNMR等方法对包合物结构进行了表征。研究结果表明，环糊精不仅可以与SEM-25的聚氧乙烯主链段形成准轮烷，还可以与其端基上的苯基形成包合物。
on bi—closed subbands of a band and free idem potent sem irings
semigroup idempotent semiring band bi—closed subband
2009/10/29
The bi—closed subbands of a band are introduced and its som e properties and characterizations are given．By using these results，the free object in the variety of idempotent semiringswhose additive red...
酒石酸钠调控草酸钙晶体生长的SEM, XRD和FTIR研究
草酸钙 酒石酸钠 SEM
2009/10/29
采用扫描电镜(SEM)、X射线衍射(XRD)和傅里叶红外光谱(FTIR)研究了凝胶体系中尿抑制剂酒石酸钠(Na2tart)的浓度和结晶温度对草酸钙(CaOxa)晶体生长的影响。当Na2tart浓度为0.01 mol·L-1时，体系中主要生成棱角尖锐的蔷薇花状一水草酸钙(COM)聚集体，二水草酸钙(COD)含量小于5％，此时XRD图谱上主要为归属于COM的(101)，(020)和(202)晶面的衍射...
Morphology of the pore space in claystones–evidence from BIB/FIB ion beam sectioning and cryo-SEM observations
Morphology pore space claystones–evidence BIB/FIB ion beam sectioning
2009/10/22
The morphology of pore space has a strong effect on mechanical and transport properties of mudrocks and clay-rich fault gouge, but its characterization has been mostly indirect. We report on a study o...
Further SEM assessment of radular characters of the limpets Patella caerulea Linneaus 1758 and P. rustica Linneaus 1758 (Mollusca: Gastropoda) from Antalya Bay, Turkey
Mollusca Gastropoda Patella caerulea Patella rustica radula
2010/3/25
This paper aims to elucidate the structure and design of radulae of 2 species of limpet, namely Patella caerulea and P. rustica. Samples were examined by light microscope and SEM. Although the general...
基于SEM与SD组合的中国建筑产业竞争力动态形成机理仿真
结构方程 系统动力学 建筑产业
2010/12/29
由于建筑产业竞争力影响因素众多,构成了一个复杂系统,且尚无成熟理论可以借鉴,造成了该问题难以开展模拟仿真研究.针对这一现状,尝试将SEM (Structural equation modeling)与SD (System dynamics)结合进行仿真.在对建筑产业竞争力相关研究回顾的基础上,设计出分析框架,利用中国2006、2007年各省份(除西藏外)建筑产业的60组基本数据构建出中国建筑产业竞...
掺钴氧化锌稀磁半导体的SEM及X射线能谱微分析研究
微分析 稀磁半导体 ZnO晶体 水热法
2009/5/5
采用水热法，以CoCl2·6H2O为前驱物，KOH作为矿化剂合成了掺钴氧化锌稀磁半导体晶体。利用扫描电子显微镜(SEM)及X射线能谱仪(XREDS)对合成晶体的微观形貌、表面及内部掺杂元素Co的相对含量和分布的均匀性进行了研究。研究结果表明：水热法合成的掺Co氧化锌晶体具有多种微观形貌，较大的晶体具有极性生长特性。随晶体形貌不同，显露面也发生了相应改变。不同微观形貌的晶体其Co含量有所差异，较大的...
FT-IR/PAS AND SEM EDX STUDIES ON ALUMINOSILICATES MODIFIED BY CS(I), TH(IV) AND U(VI)
industrial minerals radioactive waste disposal
2011/11/7
Clays and zeolites are some of the most important industrial minerals. They have practical applications in geology, agriculture, construction, engineering, process industries, and environment. This ar...
SEM Observations and Morphometrics of the Cabbage Cyst Nematode, Heterodera cruciferae Franklin, 1945, Collected Where Brassica spp. Are Grown in Tabriz, Iran
biodiversity Heterodera cruciferae plant parasitic nematodes vegetables, Iran
2010/3/25
During a survey of plant parasitic nematode biodiversity in vegetable fields of Tabriz, East Azerbaijan province, Iran between 2004 and 2005, 25 species belonging to 16 genera of nematodes were identi...
SEM研究PET核孔膜的光接枝聚合
光接枝 核孔膜 孔封盖 背侧吸附法
2007/12/21
以PET核孔膜为基材，二苯甲酮为引发剂，采用光接枝方法实现了丙烯酸和丙烯酰胺在核孔膜上的接枝，用扫描电镜(SEM)直接观察了接枝前后膜的表面形貌，考察了不同因素对于接枝位置和接枝效果的影响.发现膜材料本身特性和接枝反应条件对接枝位置和接枝效果有较大影响.通过光接枝能够实现膜孔的封盖、缩小、填堵等不同的效果.采用正侧涂布法反应，标准直孔，特别是小孔径膜(0.4μm)，不利于孔内的接枝，接枝主要在膜的...
In-situ SEM and AFM observations of surface morphology of plasma nitrided layer of austenitic steel
2007/7/28
期刊信息
篇名
In-situ SEM and AFM observations of surface morphology of plasma nitrided layer of austenitic steel
语种
英文
撰写或编译
撰写
作者
Z.W. Yu,L. Wang,etal.
第一作者单位
大连海事大学
刊物名称
Mater. Sci. & Technol. 21 (2005)
...