排序方式: 共有59条查询结果,搜索用时 296 毫秒
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以人工智能中智能规划方法为基础,对军用软件测试用例自动生成技术进行了研究。现有的许多规划器都不能避免组合爆炸问题的发生,而这一问题又是导致规划失败的一个重要问题,针对这一现象,以IPP规划器为例,提出目标分解法对规划器所需事实文件进行划分,并对IPP规划器应用多事实文件处理算法进行扩展,扩展后的MF-IPP规划器能够处理多个事实文档,有效避免了组合爆炸问题的发生。将该方法应用到军用主控软件GUI(Graphical User Interface)测试用例自动生成中,主要思想是首先利用规划器生成初始测试用例,其次提出解扩展的方法来完善测试用例的生成。针对测试用例生成问题进行了比对分析,结果显示,MF-IPP可以很好地防止组合爆炸问题的发生。所生成的测试用例生成时间短、覆盖率高,不仅能够很好地辅助软件测试人员进行测试用例的编写,还能应用于自动化软件测试。 相似文献
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测定了Gemini表面活性剂在pH值为10.86,NaBr浓度为1.0mol/L的溶液气/液界面上的表面压一分子面积的等温线。用自制的Brewster角显微镜(BAM)观察了由Gemini表面活性剂在界面上所形成单分子膜的微区形貌随表面压的变化。结果表明:当pH值为10.86时,Gemini表面活性剂在1.0mol/L NaBr溶液的气/液界面上生成了凝聚态的单分子膜;当表面压较低时,观察到在界面上形成了同心圆结构;随着表面压的增加,这些同心圆可发生聚并而形成多中心结构。 相似文献
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丝瓜中维生素C含量的测定 总被引:1,自引:0,他引:1
为建立丝瓜中维生素C含量直接测定的新方法,以10%盐酸溶液为溶剂,采用紫外分光光度法测定其含量。结果表明,维生素C在0~10 mg/L质量浓度范围内与吸光度呈良好的线性关系,回归方程为:y=0.047 46ρ+0.001 09,r=0.999 7。检出限为0.023μg/mL,加标回收率在90.6%~99.0%之间。该法操作简单,结果准确,应用于维生素C含量的测定,结果准确,令人满意,可作为控制维生素C质量的方法。 相似文献
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分析了我国企业在安全教育中存在的问题,介绍了山西铝厂安全教育市场化改革的实践和效果,指明了市场化是企业安全教育发展的新趋向,同时也是企业技术教育和管理培训改革的新趋向。 相似文献
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石羊河流域空气传播孢粉的初步研究 总被引:4,自引:0,他引:4
为了确定风长距离搬运的孢粉对干旱区尾闾型湖泊沉积物孢粉谱的贡献率,对干旱区典型的小流域--石羊河流域空气中的孢粉进行了分析.石羊河流域云杉树盛花期时,3个样点8个空气样孢粉分析显示,空气样孢粉组合与取样点植被状况大致相当,孢粉组合的空间变化基本上受现代植被分布状况控制,影响空气样孢粉谱和孢粉浓度的因素主要是取样时间和地点.在一定的范围内,干旱区风搬运孢粉的能力很强,可大量地搬运孢粉;但风长距离搬运孢粉的能力有限,超过一定距离,风搬运的孢粉数量还是很小的,风搬运的流域上游森林带的孢粉对中下游地区空气样孢粉谱的贡献率很小. 相似文献
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建立了非紧FC-空间中新的连续选择定理,作为应用,获得了非紧FC-空间中广义模糊约束多目标对策的弱Pareto平衡存在定理.我们的结论统一、改进和推广了一些近期文献的已知结果. 相似文献
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Gamze G
GER Ümmühan TÜRKYOLU Ezgi Nur GÜREN Süleyman YUR Abdullah Burak KARADUMAN Fatih G
GER Mehmet TEKN Gülmira
ZEK 《Turkish Journal of Chemistry》2021,45(2):387
In the present work, essential oil and fatty acids and extracts obtained from aerial parts of Phlomis linearis Boiss. & Bal. were investigated for chemical composition and biological activities. The phytochemical analyses were conducted with gas chromatography-mass spectrometry/flame ionisation detector (GC-MS/FID) and liquid chromatography-mass spectromtetry (LC-MS/MS) techniques. The extracts and essential oil were studied for α-amylase and acetylcholinesterase activities with two different spectrophotometric methods. Antimicrobial activities of the extracts were investigated by microdilution. The extracts were evaluated in vitro for cytotoxic effects against cancer and normal cell lines by MTT assay. The essential oil (EO) contained α-pinene (12.5%) and β-caryophyllene (10.7%) as main compounds. Palmitic (26.5%) and nonadecanoic acids (26.6%) were determined as fatty acids. Phytochemical analysis of the extracts found phenolic acids, phlinosides, verbascoside, and flavonoids. The extracts and essential oil demonstrated poor α-amylase inhibitory activity. The best acetylcholinesterase inhibitory activity was obtained for diethly ether extract of P. linearis (67.2 ± 3.4%) at 10 mg /mL concentration. Ethyl acetate extract found to be effective against Staphlococcus aureus at a minimum inhibitory concentration (MIC) of 156.26 µg/mL. Diethyl ether extract of P. linearis was active on A549 cell lines with an IC50 = 316 ± 4.16 µg/mL when compared with cisplatin IC50 = 24.43 ± 0.14 µg/mL. To the best of our knowledge, the present work is the first comprehensive report on anti-acetylcholinesterase, anti-α-amylase, and antimicrobial activities, as well as cytotoxic effects of P. linearis. 相似文献