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991.
Tian Shiqi Wang Shijie Bai Xiaoyong Zhou Dequan Lu Qian Wang Mingming Wang Jinfeng 《中国地球化学学报》2020,39(3):423-433
Acta Geochimica - In order to obtain Pb content in soil quickly and efficiently, a multivariate linear regression (MLR) and a principal component regression (PCR) Pb content estimation model were... 相似文献
992.
Zhao XinMiao Wang Hui Li ZhiHan Liu FengLin Evans Noreen J. Zhang HongFu 《Mineralogy and Petrology》2020,114(2):141-159
Mineralogy and Petrology - A detailed study on petrology and mineral chemistry of 12 mantle xenoliths from Late Cretaceous basaltic lava flows at Daxizhuang has been conducted to constrain the... 相似文献
993.
湘中及湘东南地区泥盆纪佘田桥组具有良好的页岩气成藏条件,为页岩气勘探远景区。选取地质条件优越、页岩气特征明显的泥盆纪佘田桥组含气页岩作为主要研究对象,对页岩气储气特征和勘探开发潜力进行了分析。研究表明:含气页岩层分布面积广、有机碳含量高(TOC均值0.61%)、热演化程度高(Ro均值2.71%),低孔低渗(孔隙度为0.7%,渗透率小于0.04×10^-3μm2),且吸附能力强。含气页岩层厚度展布在凹陷盆地形成独特的“中心薄边缘厚”格局,结合其成藏特征和物化指数,划分出页岩气潜力较大的四个有利区。 相似文献
994.
995.
胜利油田开采底水特征高含水油层的水平井数量多,其中油层向水平井非均衡供液现象普遍。为评价此类水平井产液剖面均衡性,量化其生产动态改善潜力,定义了产液剖面基尼系数GN,并结合现场案例介绍其计算方法,随后统计胜利油田60口样本井,分析GN对见水时间tRL和底水突破前累积产油量QRL的影响,最后据此对GN分级。计算和分析结果表明:GN可以整体表征实际非均衡产液剖面偏离理想均衡产液剖面的程度,通常取值0~1之间,数值越大,均衡性越差;划分GN0.1为产液剖面不均衡,其样本井数54口,占比90%,以理想均衡产液状态为基准,tRL和QRL分别至少有100%和69.5%的提升潜力。 相似文献
996.
Coevolution between terrestrial ecosystem and Earth environment is a hot research topic in both biology and geology. Last progresses in these field are reported from following research subjects: evolution of jawed vertebrates(gnathostomata) from Silurian; occurrence of earliest forests from Devonian of Xinjiang; biodiversity of insects in amber from Cretaceous of Myanmar; Evolution of primates and geochemistry studies from Eocene/Oligocene; studies of Longdan fauna from Lingxia basin, Gansu Province of earlier Pleistocene and endemic cloven-breast fishes from Pliocene Tibet; the correlations thick-boned fish,Hsianwenia wui, and the aridification of the Qaidam Basin; monsoon climate and its impact on biodiversity; study on the flora from Mankang, Tibet of Miocene and its palaeoclimate; depositional environment and its impact on the preservation of fossils; contraction of high resolution Stratigraphic series by using data of paleomagnetism and mammal fossils. 相似文献
997.
??????????????????α?????GPS???ι???????????α?????????????????????????????????????????????????????????????????????????в??????????????????????????????????????????α???????????????????ι????????????α???????????????????Ч?????????????????????????????????Bayes?????????????????α?????????????????????????????????????????????????????????????????????????????????????????????Щ???????????????????????????????????????????????????GPS????????м??????????????????????????Ч??????????????????????????????????????? 相似文献
998.
Min Wang Wei Wang Benlin He Mingliang Sun Yansheng Yin Lan Liu Wuyuan Zou Xuefei Xu 《中国海洋大学学报(英文版)》2010,9(4):376-380
TiO2 films were formed on metallic titanium substrates by the anodic oxidation method in H2SO4 solution under the 80V D.C.. Phase component and microstructure were characterized by X-ray diffraction (XRD) and scanning
electron microscopy (SEM). Water contact angles on titanium oxide film surface were measured under both dark and sunlight
illumination conditions. Corrosion tests were carried out in seawater under different illumination conditions by electrochemistry
impedance spectrum (EIS) and polarization curves. The result showed that the TiO2 film prepared by the anodic oxidation method was anatase with a uniform structure and without obvious pores or cracks on
its surface. The average water contact angle of the film was 116.4° in dark, in contrast to an angle of 42.7° under the UV
illumination for 2 hours, which demonstrates good hydrophobic property. The anti-corrosion behavior of the TiO2 film was declining with the extended immersion time. Under dark conditions, however, the hydrophobic TiO2 film retarded the water infiltrating into the substrate. The impedance changed slowly and the corrosion current density was
2 orders of magnitude lower than that with the film illuminated by sunlight. All of those mentioned above indicate that the
TiO2 film possesses much better performance under dark condition, and it can be applied as an engineering material under dark
seawater environment. 相似文献
999.
Drought is one of the major natural disasters causing huge agricultural losses annually. Regional agricultural drought risk
assessment has great significance for reducing regional disaster and agricultural drought losses. Based on the fuzzy characteristics
of agricultural drought risk, variable fuzzy sets model was used for comprehensively assessing agricultural drought risk of
Liaoning Province in China. A multi-layers and multi-indices assessment model was established according to variable fuzzy
sets theory, and agricultural drought risk of all 14 prefecture-level cities was respectively estimated in terms of dangerousness,
vulnerability, exposure and drought-resistibility. By calculating the combination weights of four drought risk factors, agricultural
drought risk grade of each city was obtained. Based on the assessment results, the spatial distribution maps of agricultural
drought risk were drawn. The results shows that eastern cities have lower drought dangerousness than western cities in Liaoning
Province totally. Most cities are located in low drought vulnerability region and high drought exposure region. Because of
frequent and severe drought since 2000, most cities are located in lower drought-resistibility region. Comprehensive agricultural
drought risk presents apparent spatial characteristics, escalating from the east to the west. Drought dangerousness is the
most important factor influencing comprehensive agricultural drought risk. Through the spatial distribution maps of drought
risk, decision makers could find out drought situation and make decisions on drought resistance conveniently. 相似文献
1000.
Typhoon Durian (2001),which formed over the South China Sea (SCS),was simulated by using the Weather Research and Forecasting (WRF) model. The genesis of typhoon Durian which formed in the monsoon trough was reproduced by numerical simulations. The simulated results agree reasonably well with observations. Two numerical experiments in which the sea surface temperature (SST) was either decreased or increased were performed to investigate the impact of the SST on the genesis of the ty-phoon. When the SST was decreased by 5℃ uniformly for all grids in the model,the winds calculated became divergent in the lower troposphere and convergent in the upper troposphere,creating conditions in which the amount of total latent heat release (TLHR) was low and the tropical cyclone (TC) could not be formed. This simulation shows the importance of the convergence in the lower tropo-sphere and the divergence in the upper troposphere for the genesis of the initial vortex. When the SST was increased by 1℃ uni-formly for all grids,a stronger typhoon was generated in the results with an increase of about 10 m s-1 in the maximum surface wind speed. Only minor differences in intensity were noted during the first 54 h in the simulation with the warmer SST,but apparent dif-ferences in intensity occurred after 54 h when the vortex began to strengthen to typhoon strength. This experiment shows that warmer SST will speed the strengthening from tropical storm strength to typhoon strength and increase the maximum intensity reached,while only minor impact can be seen during the earlier stage of genesis before the TC reaches the tropical storm strength. The results sug-gest that the amount of TLHR may be the dominant factor in determining the formation and the intensification of the TC. 相似文献