共查询到20条相似文献,搜索用时 125 毫秒
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针对钻井液用抑制剂性能评价过程中出现实验结论异常的现象,通过泥页岩线性膨胀量实验、岩心浸泡实验、热滚回收实验、岩心滴染扫描电镜观察实验等多种方法,探讨了多种包括无机盐、硅酸盐、聚乙烯醇等在内的抑制剂抑制性评价方法的适应性问题。结果表明,低浓度的氯化钾与氯化钠不适用于采用人工岩心浸泡实验和线性膨胀量实验进行评价;线性膨胀量实验要求抑制剂质量分数在0.3%以上且实验时间不少于6 h才能得到相对准确的实验结论;基浆粘度对泥页岩热滚回收实验具有明显的影响,基浆粘度越高初始热滚回收率越高。为此,在进行抑制剂效果评价时应充分重视评价方法、抑制剂浓度、实验持续时间、基浆粘度等多种因素的影响,寻求针对性评价手段以避免得到错误的实验结论。 相似文献
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研究了偏二甲肼(UDMH)中颗粒物粒径的组成,测定了密理博滤膜浸泡过程中乙醇电导率的变化,分析了滤膜浸泡前后和过程中质量的变化,观察了滤膜的表面形貌,最后在未浸泡和正常浸泡滤膜间进行了对比实验。结果表明:UDMH中10μm以上颗粒物体积占总体积的71.7%;滤膜离子含量不影响颗粒物元素测定,滤膜质量在浸泡后预计不变,滤膜表面质量良好;在正常浸泡和未浸泡滤膜所测定的颗粒物结果中,期望的差值为0.02 mg/L,密理博滤膜可不浸泡直接用于实验。 相似文献
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通过实验对邻菲啰啉法测定循环水总铁含量的影响因素—显色剂用量、玻璃器皿洗涤方式、测定时间等进行了探讨。结果表明,显色剂用量为2.0 mL时,显色效果最好。采样后30min内测定为宜。玻璃器皿用1:1盐酸浸泡后再使用,消除杂质干扰,测量值更准确。 相似文献
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卷式超滤装置的水洗再生行为的实验研究 总被引:4,自引:0,他引:4
本文实验研究了卷式超滤装置的各种水力冲洗再生技术,例如,减压大流量冲洗、静置浸泡、反冲洗和静置浸泡加反冲洗方法。实验结果表明,对于FI8的供给水每小时反冲洗一次,可以有效地维持该装置稳定出力,而浸泡10小时以上并反洗2分钟透水性能完全恢复。 相似文献
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聚氨酯胶粘剂在NaCl水溶液中的耐久性机理研究 总被引:1,自引:0,他引:1
采用拉伸实验方法测试了聚氨酯胶粘剂胶接试样在盐溶液中浸泡前后的拉伸剪切强度,并考察了水、NaCl水溶液的温度、NaCl的含量以及应力对胶粘剂粘接强度的影响。利用红外谱图分析了浸泡前后胶粘剂化学结构的变化。实验结果表明:聚氨酯胶粘剂的粘接强度在NaCl水溶液中的下降速率比在蒸馏水中的下降速率慢。温度的作用主要表现为在浸泡初期能加速聚氨酯胶粘剂的降解和粘接强度下降,但是在浸泡中后期,则其作用变小。聚氨酯胶粘剂粘接强度的下降趋势在浸泡初期随NaCl含量的增加而减缓,在浸泡中后期,其结果刚好相反。胶粘剂的粘接强度随载荷的增加而急剧下降。 相似文献
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实验主要研究了水温及浸泡时间对日照绿茶中氨基酸含量的影响。研究表明:水温90℃,浸泡时间30min时,日照绿茶中氨基酸含量较高。 相似文献
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利用浸泡实验方法和SEM技术,对鄂尔多斯矿区泥岩样本进行微观结构分析及研究,定量分析了泥岩在不同浸泡时间后的水化膨胀率及膨胀应变,建立了泥岩地层水化井壁围岩应力计算模型,研究获得了泥岩吸水后井壁周围的应力分布规律和坍塌失稳点,数值计算结果与泥岩浸泡实验结果相吻合。研究方法及结论对于解决煤层气地面钻井泥岩段地层的井壁失稳问题具有指导意义。 相似文献
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Abstract. Power studies for three tests of fit, namely the classical test given by Whittle, the widely-known test given by Ljung and Box, and the recent test given by Godolphin, are derived for the invertible time series models considered previously in an empirical study. The results demonstrate that it is possible to improve on the Ljung-Box test by employing more empirically-based alternatives. In particular, the test derived by Godolphin appears to be more powerful than the other tests. The results also suggest that the Whittle and Ljung-Box tests are complementary, so that the combination of both may yield a sensitive test procedure. 相似文献
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Abstract. The test for white noise proposed by Reschenhofer ( Biometrika 76 (1989) 629–32) is adaptive in that the form of its test statistic depends on the data. It proceeds (i) by using the real part of the finite Fourier transform of the data for the selection of the form of the test statistic and (ii) by applying the selected test statistic to the imaginary part.
In this paper it is shown that independently of using information contained in the real part to construct a test statistic for the imaginary part, information contained in the imaginary part can be used to construct a test statistic for the real part. Because of the independence of these tests, they can easily be combined.
Then a further test is proposed which again is adaptive but where both the real and imaginary parts contribute simultaneously to a single test statistic. 相似文献
In this paper it is shown that independently of using information contained in the real part to construct a test statistic for the imaginary part, information contained in the imaginary part can be used to construct a test statistic for the real part. Because of the independence of these tests, they can easily be combined.
Then a further test is proposed which again is adaptive but where both the real and imaginary parts contribute simultaneously to a single test statistic. 相似文献
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通过红外光谱、色差和力学性能等研究了丙烯腈–丁二烯–苯乙烯塑料(ABS)在人工加速老化试验(UVA,UVB和氙灯)及户外自然老化试验过程中老化行为的相关性。红外分析结果表明,不同ABS材料在人工加速老化和自然老化过程中遵循相同的光氧老化动力学,但不同光源对ABS材料的加速老化作用有明显差别;色差分析结果表明,人工加速老化试验对色差变化的加速倍率由大到小顺序为:UVBUVA氙灯。通过分析ABS材料的色差及力学性能在人工加速老化与户外自然老化过程中变化的相关性,拟合了人工加速老化与户外自然老化的时间换算方程。 相似文献
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本文介绍了乙酸酐-吡啶-甲苯为特征的乙酰化反应体系,且在此体系下通过正交的方法确定了反应参数,建立了可生物降解聚酯材料的羟值表征方法,并按照正交试验确定的实验参数进行对比试验,同时将正交试验的拟合数据和实际测试数据进行了假设检验.统计数据显示两种加热方式对测试的结果影响是不显著的;通过拟合方程计算的理论数据和实际测试数据的差异也是不显著的,如此证明了拟合方程的正确性和适用性,进而确定了生物聚酯材料的羟值测试方法,在聚酯的生产和应用过程中具有较高的实用价值。 相似文献
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AbstractIn this article, we consider a test of the sphericity for high-dimensional covariance matrices. We produce a test statistic by using the extended cross-data-matrix (ECDM) methodology. We show that the ECDM test statistic is based on an unbiased estimator of a sphericity measure. In addition, the ECDM test statistic enjoys consistency properties and the asymptotic normality in high-dimensional settings. We propose a new test procedure based on the ECDM test statistic and evaluate its asymptotic size and power theoretically and numerically. We give a two-stage sampling scheme so that the test procedure can ensure a prespecified level both for the size and power. We apply the test procedure to detect divergently spiked noise in high-dimensional statistical analysis. We analyze gene expression data by the proposed test procedure. 相似文献