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871.
泌阳断陷下第三系核三上段可划分为三个陆相层序(S4、S5和S6).每一层序自下而上发育TST、HST和RST三个体系域。对泌阳断陷下第三水核三上段S5层岸各体系域中几类岩石地球化学标型参数的研究发现,在S5层序形成时期,由于在一个旋回性变迁的古气候(古湿度和古温度)驱动下,湖平面发生了一次完整的旋回性变化;湖泊水体的物理化学条件(古盐度、古酸碱度、古氧化还原电位等)及物源性质亦随之发生一次旋回性变化:相应地,沉积岩中岩石类型、矿物成分(主要指粘土矿物和胶结物)、化学成分(包括常量元素和微量元素及水溶性离子等)以及碳、氧同位素等皆发生了一次旋回性变化。 相似文献
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包含详细微物理过程的一维辐射雾模式 总被引:3,自引:0,他引:3
本文建立一个包含详细微物理过程的一维雾模式.模式包括动量方程、热量方程、水汽方程、雾滴凝结增长方程和浓度变化方程等.大气长波辐射采用Roach的五波段模式,微物理过程采用分档技术.试验结果表明,该模式可用于辐射雾的研究. 相似文献
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城市绿地综合效益评价方法探讨:——天津实例应用 总被引:14,自引:0,他引:14
胡Dan 《城市环境与城市生态》1994,7(1):18-22
本文从复合生态系统理论出发,建立了城市绿地综合效益评价指标体系并将AHP决策分析方法同模糊评价方法相结合,提出了一种城市绿地综合效益评价方法,同时,阐述了这一方法在天津的实际应用。 相似文献
877.
Keshan disease (KD) occurs in a wide geographic belt stretching from the Heilongjiang Province in northeastern China to Yunnan Province in southwestern China, including Huangling County, Shaanxi Province. In order to research relationships between eco-environmental geochemistry and KD pertaining to Se, Mo, B, Zn, Mn, and Cu, this investigation was conducted in the Jiantou KD area in Huangling County, one of the areas in China where the incidence of KD is highest. Environmental samples (rock, soil, plant and childrens hair) were collected from the area. Se in plants is low, ranging from 0.03 to 0.06 µg Se g–1 in corn, potato and soybean. Se contents in childrens hair are normal or reach the limitation of dangerous level. This study reports 0.18 µg Se g–1, B <40 µg g–1, and Mo <1.0 µg g–1 in aeolian soil, 0.14–0.38 µg Mo g–1 and 3–8 µg B g–1 in corn and potato (daily staple food for local human beings in the area). The Jiantou KD area is one where the elements Se, Mo and B are deficient. It is proposed that the deficiency of elements Se, Mo and B may be involved in the pathogenicity of KD with respect to the eco-environmental system because Se, Mo and B are essential micronutrients for plants and human beings. It seems that there is no significant relationship between the Zn–Mn–K–Pb–Ba associations and KD. 相似文献
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The generation rates and emission factors of particulate matter and associated polycyclic aromatic hydrocarbons (PAHs) from incense burning were assessed in a laboratory setting. The differences among different segments of the same stick, among different sticks of the same kind of incense, and between two kinds of manually made Chih-Chen incense sticks (A and B) were evaluated. Joss sticks were burned inside a 44 cm long elutriator; personal environmental monitors fitted into the top of the elutriator were used to take PM2.5 and PM10 samples of incense smoke. Samples were analyzed for PAHs by gas chromatography-flame ionization Detector. It was found that particle and associated PAHs were generated approximately at 561 microg/min (geometric standard deviation (GSD) = 1.1) and 0.56 microg/min (GSD = 1.1) from Incense A, and at 661 microg/min (GSD = 1.7) and 0.46 microg/min (GSD = 1.3) from Incense B, respectively. One gram of Incense A emitted about 19.8 mg (GSD = 1.1) particulate matter and 17.1 microg (GSD = 1.2) particulate-phase PAHs, while one gram of Incense B produced around 43.6 mg (GSD = 1.1) of particles and 25.2 microg (GSD = 1.2) of particle-bound PAHs. There were significant differences in emissions between Incenses A and B, although they belong to the same class of incense. A 10-20% variability in emissions was observed in the main part of the manually produced stick, and a larger variation was found at both tips of the combustible part. 相似文献