排序方式: 共有49条查询结果,搜索用时 15 毫秒
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对十足目甲壳动物的雄性腺体激素(AGH)蛋白成分的分离、制备,本文研究了两种不同的高效液相色谱分析方法,研究结果表明,排阻色谱法(SEC)分离AGH效果显著,分析速度快,分离完全,流动相易得、易处理,便于AGH纯品的收集、制备. 相似文献
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针对不同油田泵机组的用能情况不同而导致的泵机组评价指标种类和权重产生差异的问题,提出一种确定指标的方法,根据西北油田泵机组的实际工况,采用相关系数法筛选评价指标,再结合主成分分析法与灰色关联法综合评价泵机组的用能情况.结果表明筛选出了5个评价指标,按权重大小排序依次为泵机组效率、节流损失率、外输负载率、集输单耗、功率因数.通过关联度的计算,找到了能量损失严重的泵机组,并分析判断出其薄弱环节. 相似文献
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A simple fiber tip sensor for refractive index(RI) measurement based on Fabry-Perot(FP) interference modulated by Fresnel reflection is proposed and demonstrated.The sensor head consists of an etchinginduced micro air gap near the tip of a single-mode fiber.The microgap and the fiber tip function as two reflectors to form a FP cavity.The external RI can be unambiguously measured by monitoring the fringe contrast of the interference pattern from the reflection spectrum.The experimental results show that the proposed sensor achieves temperature-independent RI measurement with good linear response.The proposed sensor achieves a high RI resolution of up to 3.4×10 5 and has advantages of low cost and easy fabrication. 相似文献
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我国著名数学家华罗庚教授曾写了一首词来描述数形结合思想:数与形,本是相倚依,焉能分作两边飞.数缺形时少直觉,形离数时难入微,数形结合百般好,隔离分家万事非.切莫忘,几何代数统一体,永远联系,切莫分离. 相似文献
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运用在线顶空提取/气相色谱-四极杆质谱联用技术(HS/GC-QMS),建立了精TiCl4中有机痕量杂质CS2和CCl4的定量分析方法。在85℃及中速振摇的条件下平衡20 min,定量地将顶空气体直接引入GCQMS中,并在质谱选择离子监测(SIM)模式下,以n-C6H14(m/z 86)为内标,采用标准加入法对CS2(m/z 76)和CCl4(m/z 117)进行定量测定。CS2和CCl4在相应浓度范围内呈良好线性,回归系数(r)均大于0.999 0,最低定量下限(LOQ)均为20 nL/L,在4个不同加标水平下,平均回收率分别为102.2%和108.5%,相对标准偏差为1.3%~18.9%。该方法分析过程简单、快捷,结果准确、稳定,可用于TiCl4的质量监控,并可为精TiCl4工业监控提供有利参考。 相似文献
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Improvement of speckle noise suppression in digital holography by rotating linear polarization state 总被引:1,自引:0,他引:1
An improved polarization recording approach to reduce speckle noise in digital holography is proposed. Multiple off-axis holograms are obtained by rotating the linear polarization state of both illumination and reference wave simultaneously. By averaging the intensity fields, the speckle noise in the reconstructed images is well suppressed. Statistical evaluation of the experimental results shows the effectiveness and improvement of the proposed method. 相似文献