共查询到20条相似文献,搜索用时 93 毫秒
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采用正交设计实验法对工作参数进行了最佳选择,用基体匹配的办法消除基体影响.对在最佳实验条件下,测定杂质元素检出限在0.04×10 ̄(-2)~2.62×10 ̄(-2)μg/ml,相对标准偏差1.79%~7.30%。标准回收率为88.55%~115.66%。方法简便、快速,能满足钻系列产品质量的分析需要。 相似文献
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研究了吐温40-KOH-Os(Ⅳ)化学发光新体系,发现丙酮等有机溶剂对该化学发光反应有很大地增敏作用。锇量在1.0×10^-8~1.0×10^-6g/ml范围内,发光强度与锇量成正比。方法在检出限为1.1×10^-10g/ml;对于1.0×10^-7g/ml的Os(Ⅳ)重复11次测定发光强度的相对标准偏差为2.2%。 相似文献
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叙述了用石墨炉原子中吸收法测定钢中微量铋的方法,试样经王水溶解,甲酸处理后蒸干,在1.5M盐酸中用抗坏血酸还原三价铁,经KI-MIBK萃取,用硝酸镍作基本改进剂,有机相注入衬钽石墨管进行测定。本方法线性范围:0.05-0.5μg/ml,相对标准偏差:0.00005%为6.30%;0.00033为4.09%,20%Ni20%Cr,4%Mo不干扰测定,1%Cu影响萃取率,可以采用含量匹配加以校准。 相似文献
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利用反相流动注射系统,对光泽精-H2O2-Sn(Ⅳ)化学发光新体系进行了研究。考察了测定锡的最佳条件,在选定条件下测定Sn(Ⅳ)的线性响应浓度为30×10-9~9.0×10-6g/ml,方法灵敏度较高,检测下限达25ng/ml,对含5.5×10-7g/mlSn(Ⅳ),n=11,RSD为3.7%,本法用于沉积物标样中锡的测定,其结果与推荐值吻合。 相似文献
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介绍用氢化物发生-原子荧光光谱法测定氧化钼中铋和锑时,可不分离基体钼。本法简便快速,结果令人满意。检测限Bi0.48ng/ml,Sb0.46ng/ml;相对标准偏差RSDBi2.9%,Sb4.9%;在0~0.080μg/ml范围内的Bi,Sb良好的线性关系 相似文献
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在酸性溶液中用正丁醇、三氯甲烷混合液一次萃取后,以氯化亚锡还原成磷钼蓝进行比色测定。该法的表观摩尔吸光系数为2.2×104L·mol-1·cm-1,在0 ̄25μg/25ml范围内符合比尔定律,对锡青铜、黄铜、电解铜中磷含量在0.000x~0.35%的试样分析结果满意,共存杂质元素不干扰磷的测定。 相似文献
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倪志安 《Canadian Metallurgical Quarterly》2011,23(3)
马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础. 相似文献
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为了保障矿山企业的发展与矿山地质自然环境形成协调的发展模式,应对矿山深层水位的沉降进行检测,水工环地质调查是确定矿山地下水位深度的有效手段之一。基于此,开展对矿山地质构造沉降监测中水工环地质调查的作用分析研究,通过研究得出,水工环地质调查可以提高矿山地质构造沉降监测结果精准度、为矿山地质构造沉降提供应急方案、保障矿山地质构造沉降监测工作效率等作用,对实现矿山企业的精细化施工提供有利条件。 相似文献
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D. N. Reznikov 《Metallurgist》1962,6(12):535-537
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The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease. 相似文献
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加强烧结过程控制与稳定烧结矿质量 总被引:1,自引:0,他引:1
烧结矿的金属性能包括机械强度、氧化还原性和强度稳定性项指标,而影响这些因素种类繁多、错中复杂。介绍了烧结厂通过加强对烧结全过程的控制,稳定烧结矿金属质量的方法和效果。 相似文献
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Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions. 相似文献