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Introduction The anisotropy of the Earth crust medium is a common phenomenon(Crampin,1984).More and more observation materials and study results have proved that on most of the Earth′s upper crust is spread fluid-filled cracks and microcracks,which are aligned according to the contempo-rary stress-field.Such distributions of aligned cracks show effectively anisotropy to seismic wave and the phenomenon is called extensive-dilatancy anisotropy(EDA)(Crampin et al,1984).At the same time,it is … 相似文献
84.
鲁东南岚山头含柯石英榴辉岩主要产于花岗质片麻岩内,是苏鲁超高压变质带主要榴辉岩体密集分布区之一。流体包裹体研究表明,榴辉岩矿物及细脉石英中捕获有四种类型包裹体:在超高压-高压榴辉岩相条件下捕获的 N_2±CO_2包裹体;在高压榴辉宕重结晶阶段被捕获的 CO_2-H_2O 包裹体和含子矿物高盐度 H_2O 溶液包裹体:在超高压岩石折返过程中的最晚(角闪岩相退变质甚至更晚)阶段捕获的低盐度 H_2O 溶液包裹体。利用榴辉岩矿物及脉体石英中捕获的流体包裹体相互期次关系,可以对本区超高压变质作用板片折返过程中的流体演化史进行重建。 相似文献
85.
利用凝胶过滤柱层析和阴离子交换柱层析技术,从牙鲆(Paralichthys olivaceus)胚胎孵化液中分离纯化出了大小约为34.8ku的牙鲆孵化酶。该酶卵膜裂解的最适反应温度为35℃,最适pH为7.0;对底物酪蛋白的米氏常数Km值为1.53mmol/L。该酶对丝氨酸蛋白酶和胰蛋白酶的特异性抑制剂非常敏感,而对其他蛋白酶抑制剂不敏感,表明该酶极可能是一种丝氨酸蛋白酶类型的胰蛋白酶。此外,该酶可浓度依赖性地被EDTA所抑制,被Cu^2+所强烈抑制,被Ca^2+和Mg^2+所激活,对Zn^2+则不敏感,表明该酶很可能是一种金属蛋白酶。 相似文献
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Seasonal variability in free-living marine nematode community structure in a sandy beach of the Taiping Bay of Qingdao, China 总被引:1,自引:0,他引:1
Nematode assemblage composition, trophic structure and biodiversity were followed over an annual cycle in a sandy beach of the Taiping Bay of Qingdao, China. Nematode assemblage in the sandy beach maintained a high genus diversity (75 genera). Mlero- laimus and Bathylaimus were the dominant genus of the nematode assemblage, accounting for 66% of the total nematode abundance. The nematodes' dominant trophic structure changed seasonally as a response to the seasonal changes in food quality. Epigrowth-feeder nematodes (2A) were the dominant trophic groups in the trophic structure with the highest abundance in spring because of phytoplankton bloom, while the feeding type ( 1 B) showed higher abundance in summer that was due to the increasing of sediment detritus after spring bloom. Furthermore, species diversity and evenness calculated on nematodes identified to the genus level displayed significant temporal changes, which was also reflected by the index of trophic diversity. According to the cluster analysis, the nematode community structure of the whole year was clearly separated into two periods (A and B). Biota-Envlron- ment matching (BIOENV) results showed that seawater temperature, sediment Chl a and grain size were responsible for the nema- tode community structure variation in spring and summer period (Period A). However, seawater/interstitial water temperature, interstitial water dissolved oxygen concentration,interstitial water salinity, and sediment Ph a a were more important in constructing the autumn and winter period (Period B) nematode community structure. 相似文献
88.
A study of SAR remote sensing of internal solitary waves in the north of the South China Sea:I.Simulation of internal tide transformation 总被引:2,自引:1,他引:1
For settlement of the well-known problem of contemporary radar imaging models,i.e.,the pmblem of a general underestimation of radar signatures of hydrodynamic features over oceanic internal waves and underwater bottom topography in tidal watels at at high radar frequency bands(X-band and C-band),the impact of the ocean surface mixed layer turbulence and the significance of strat-ified oceanic model on SAR remote sensing of internal solitary waves are proposed.In the north of the South China Sea by utilizing seme observed data of background field the nonlinearity coefficient,the dispersion coefficient,the horizontal variability coefficient and the phase speed in the generalized K-dV equation are determined approximately.Through simulations of internal tide transfor-mation the temporal evolution and spatial distribution of the vertical displacement and horizontal velocity of intereal wave field are obtained.The simulation results indicate that the maximum amplitudes of internal solitary waves occur at depth 35 m,but the maximum current speeds take place at depth 20 m in this area of the sea(about 20°30'N,114°E)in August.It was noticed that considering the effects of flood current and ebb current respectively is appropriate to investigate influence of the background shear flow on coefficients of the K-dV equation.The obtained results provide the possibility for the simulation of SAR signatures of inter-nal solitary waves under considering the impact of ocean surface mixed layer turbulence in the companion paper. 相似文献
89.
增强现实中的跟踪注册技术一直是研究的重点和难点,而地下矿道和巷道内亮度低,产生的图像较昏暗,车载相机快速运动和抖动,对传统的基于特征匹配的跟踪注册提出了挑战。本文从提高增强现实中跟踪注册稳健性和精度出发,采用基于Retinex改进的方法增强昏暗图像的亮度,同时利用基于对抗神经网络的方法恢复运动模糊图像。首先提取图像ORB特征,实现初始化;然后根据跟踪特征点的数量,开启图像增强和图像恢复线程,提高特征点提取质量和数量。在数据集和真实模拟场景下的试验结果显示,跟踪精度提高了12%左右,在低亮度和含有轻微模糊的情况下,跟踪注册稳健性也有显著提高。 相似文献
90.
JIN Jian-hui WANG Xiao-yang ZHOU Zhen-yu HUANG Yun-ming FAN Xue-chun ZUO Xin-xin LI Zhi-zhong LING Zhi-yong REN Yong-qing LI Shu-tong 《山地科学学报》2021,(8):2012-2023
The timing of Palaeolithic human activities in South China is still controversial because of the lack of a reliable chronology of archaeological sites. The Longdengshan Palaeolithic site(LPS), located close to the Wuyi Mountain of South China, represents the first discovered and scientifically excavated Middle Palaeolithic site in the Fujian Province. This site is of considerable significance for studying the diffusion and cultural connotation of early Homo sapiens in southern China. In this study, we present optically stimulated luminescence(OSL) ages obtained from medium-grained quartz collected at the LPS. The single-aliquot regenerative-dose measurements of red soil deposits collected at the same site yielded internally and stratigraphically consistent ages and similar errors, indicating a potential ability of the technique, and also reflecting the influence of various sedimentary facies on the test results. Our results indicate that the 38-63 μm quartz grains were generally partially-bleached and had large values of over-dispersion in the palaeo-reticulated laterites of west Fujian. Some samples yielded unsatisfactory results, suggesting that the degree of bleaching of diluvial and alluvial deposits should be properly assessed before dating. We did not detect any enrichment/depletion of U, Th and radioactive disequilibrium. The effect of chemical weathering on the dose rate estimation was negligible. Therefore, we used a central age model and the maximum age model to calculate the age of two samples, respectively, and the minimum age model to calculate the ages of the rest of the samples. The OSL ages of the samples ranged from 27.09 ± 2.30 ka to 54.65 ± 7.39 ka for the 38-63 μm quartz size fraction, and roughly corresponded to the Marine Isotope Stage 3. In addition, three ages out of five are based on the calculation of minimum ages in this research, which needs to be further verified by other dating methods. 相似文献