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61.
Yongliang SUN Xiaoyan LI Lianyou LIU Heye XU Dengshan ZHANG 《Frontiers of Environmental Science & Engineering in China》2008,2(3):340-348
The Qinghai Lake Watershed, containing the largest saline lake in northwest of China, has suffered from severe sandy land
development in recent years. This paper analyzes its daily precipitation, temperature, and wind from 1958 to 2001, and the
spatial and temporal distributions of sandy land through the interpretation of remote sensing images covering four years (1977,
1987, 2000, and 2004). Results showed that since the middle of the 1960s, the daily precipitation (P) of 0<P⩽5 mm decreased, while the P>20 mm increased significantly (S<0.05) in their annual total amounts and days. The maximum daily precipitation also increased significantly. Both the maximum
dry spell and the total dry spell of more than ten days had a significant upward trend. Since the beginning of the 1960s,
all the extremely high, extremely low and mean temperatures increased significantly (S<0.01), at a rate of 0.1°C/10a, 0.2°C/10a, and 0.2°C/10a, respectively. The days with extremely high temperature had a significant
upward trend, while the days with extremely low temperature had a significant downward trend. The Qinghai Lake was significantly
shrinking (S<0.01) and provided abundant sediments for Aeolian erosion. The NNW wind prevailed in the watershed, and the largest scale
wind was from the west and concentrated on the dry months. As a result, the sandy land was mainly born on the east bank of
Qinghai Lake. The total sandy land area in the watershed had grown from 587.4 km2, 660.7 km2, 697.6 km2 to 805.8 km2, accordingly, its area percentage growing from 2.0%, 2.2%, 2.4% to 2.7%, respectively. 相似文献
62.
本文通过三个典型的实测案例,探讨高密度电阻率法在隐伏断裂探测中的分析与应用;通过工程场地地质剖面的分析,对隐伏断裂的判定与异常的排除、以及它们不同的电性特征和解释方法进行了分析与探讨. 相似文献
63.
氧化镁湿法烟气脱硫回收工艺的技术经济可行性初步分析 总被引:5,自引:0,他引:5
介绍了回收结晶硫酸镁的氧化镁湿法烟气脱硫工艺的基本工艺流程,在抛弃法脱硫系统上所作的工业试验证明了吸收液循环提浓MgSO4的可行性。参照工业硫酸镁生产工艺对130t/h燃煤锅炉烟气脱硫作了回收工艺的投资效益分析和整体工艺的经济性评价,结果表明回收工业硫酸镁具有良好的经济效益。 相似文献
64.
甲胺磷农药降解菌HS-A32的分离鉴定及降解特性 总被引:5,自引:0,他引:5
从长期受有机磷农药污染的土壤中分离到一株降解菌HS-A32,能以甲胺磷作为唯一的碳源和氮源生长.HS-A32菌降解甲胺磷的最适温度为30℃,最适pH值为7.0,甲胺磷的最适降解浓度为1 000 mg/L,降解率达82%.聚酰胺薄层色谱(TLC)可检测到降解产物中有NH4 生成.HS-A32菌能以多种碳、氮源生长,外加可利用的碳源和氮源能促进甲胺磷的降解.通过16S rDNA扩增、测序,运用BLAST检索分析,构建系统进化树.结合生理生化鉴定,初步确定HS-A32为不动杆菌属(Acinetobacter).HS-A32菌还能降解甲基对硫磷等多种有机磷农药.图6表1参14 相似文献
65.
In insects, hydrocarbons waterproof the cuticle, protect the insect from the external environment, and serve as semiochemicals or their metabolic precursors. In the German cockroach, Blattella germanica, hydrocarbons are synthesized by the abdominal integument, but the precise site of biosynthesis is not known. We developed a method for separation of oenocytes from other cells in the abdominal integument using enzymatic dissociation followed by Percoll gradient centrifugation. Radiolabeled propionate was then used to monitor de novo synthesis of hydrocarbons by dissociated cells. Oenocyte-enriched cell suspensions of abdominal sternites synthesized hydrocarbons, whereas suspensions enriched with epidermal cells did not. Our results show conclusively that hydrocarbons are produced by oenocytes not only in insects whose oenocytes are localized within the hemocoel, but also in those insects whose oenocytes are within the abdominal integument. Furthermore, these data support a hemolymph pathway for transport and delivery of hydrocarbons to both external and internal tissues, including the epicuticle, fat body, and ovaries. 相似文献
66.
Li Ziyue Chen Yongliang Meng Fanlei Shao Qi Heal Mathew R. Ren Fengling Tang Aohan Wu Jiechen Liu Xuejun Cui Zhenling Xu Wen 《Environmental science and pollution research international》2022,29(38):57190-57203
Environmental Science and Pollution Research - While intensive peach production has expanded rapidly in recent years, few studies have explored the environmental impacts associated with specific... 相似文献
67.
68.
Accelerating the (NH4)2SO3 oxidation gives rise to the reclaiming of byproduct, while there are secondary environmental risks from reduction of the coexisted selenium species by sulfite. In this study, a bi-functional Co-SBA-15-SH, were synthesized through Co impregnation and sulfhydryl (-SH) decoration, which can simultaneously uptake Se and accelerate sulfite oxidation efficiently. Meanwhile, the adsorption kinetics and migration mechanism of Se species were revealed through characterization and density functional calculations, with maximum adsorption capacity of 223 mg/g. The inhibition of Se0 re-emission and poisonous effect of Se on sulfite oxidation was also investigated. Using the findings of this study, the ammonia desulfurization can be improved by enabling purification of the byproduct and lowering the toxicity of effluent by removing toxic pollutants. 相似文献
69.
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