965 resultados para ZN-65


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分别对测试系统本底及经两种方法处理的M n-Zn铁氧体样品进行了测试,分析其主要的出气成分,计算出处理后的样品材料出气率。通过测试与分析,得出了对置于超高真空环境内的M n-Zn铁氧体材料表面的保护和清洁方法。

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Excitation energies and electron impact excitation strengths from the ground states of Ni-, Cu- and Zn-like Au ions are calculated. The collision strengths are computed by a 213-levels expansion for the Ni- like Au ion, 405-levels expansion for the Cu-like Au ion and 229-levels expansion for the Zn-like Au ion. Configuration interactions are taken into account for all levels included. The target state wavefunctions are calculated by using the Grasp92 code. The continuum orbits are computed in the distorted-wave approximation, in which the direct and exchange potentials among all the electrons are included. Excellent agreement is found when the results are compared with previous calculations and recent measurements.

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1990—1995年中国科学院生态网站联网研究中,在4个生态站对重金属复合污染(Cd、Pb、Cu、Zn、As)进行了田间迁移动态实验研究,表明3年来表土中重金属元素含量缓慢下降,输出量最大支出项目为从表层向下迁移量可比作物地上部分带去量高出几十至数百倍,为污染土壤防治工作中淋洗技术运用指出了应用前景.

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以土壤脱氢酶、呼吸强度和微生物生物量作为生态毒理指标,通过正交实验,在室内培养条件下考察了4种不同性质的有机与无机污染物(Cd、Zn、菲和多效唑)复合污染的土壤微生物生态效应。复合投加这4种污染物能使土壤微生物活性受到不同程度的抑制,且抑制率随时间的推移而下降;3种微生物生态毒理指标之间存在着很好的相关性,但脱氢酶活性在三者中最敏感;影响土壤微生物活性的主要因子依次为:菲>Cd>Zn>Zn与菲的交互作用>Zn与多效唑的交互作用;实验表明,Zn与菲的交互作用为拮抗作用,但Zn与多效唑的复合效应机制仍不明确