Corrosion test data were measured using non-destructive electrochemical techniques and analysed for studying inhibition effectiveness by different concentrations of NazCr207 on the corrosion of concrete steel-rehar in...Corrosion test data were measured using non-destructive electrochemical techniques and analysed for studying inhibition effectiveness by different concentrations of NazCr207 on the corrosion of concrete steel-rehar in NaC1 and in H2SO4 media. For these, specifications of ASTM G16-95 R04 were combined with the normal and the Gumbel probability density functions as model analytical methods for addressing issues of conflicting reports of inhibitor effectiveness that had generated concerns. Results show that reinforced concrete samples admixed with concentrations having 4 g （0.012 7 tool）, 8 g （0.025 4 mol） and 6 g （0.019 l tool） NaaCr207 exhibited, in that order, high inhibition effectiveness, with respective efficiency, r/, of （90.46±1.30）%, （88.41＋2.24）% and （84.87±4.74）%, in the NaC1 medium. These exhibit good agreements within replicates and statistical methods for the samples. Also, optimal inhibition effectiveness model in the H2SO4 medium was exhibited by 8 g （0.025 4 mol） Na2Cr207 concentration having r/=（78.44±1.10）%. These bear implications for addressing conflicting test data in the study of effective inhibitors for mitigating steel-rebar corrosion in aggressive environments.展开更多
Based on Princeton Ocean model, circulation in the Yellow Sea and East China Sea and its annual cycle are simulated. The model results show a weak countercurrent on the left side of the Kuroshio. The countercurrent se...Based on Princeton Ocean model, circulation in the Yellow Sea and East China Sea and its annual cycle are simulated. The model results show a weak countercurrent on the left side of the Kuroshio. The countercurrent separates from the main stream of the Kuroshio around 30°N, 128°E, where the Kuroshio turns right to the Tokara Strait it flows southwestward along isobaths, meets with the offshore branch of Taiwan Warm Current around 28°N. 124°E, then returns back and joins the main stream, so that a cyclonic circulation is formed. The center and strength of the countercurrent and cyclonic circulation exhibits seasonal variation. The lower layer cold water observed on PN section of the East China Sea in summer and autumn is considered to be associated with the modeled cyclonic circulation. According to Rossby's wake-stream theory, lateral friction may be the main mechanism of the countercurrent on the left side of the Kuroshio.展开更多
开展了钛合金材料高温疲劳试验研究。试验共设计3种工况,即：200℃,0.5 k N-22.5 k N-0.5 k N力加载循环;300℃,0.5 k N-22.5 k N-0.5 k N力加载循环;200℃,0.5 k N-30 k N-0.5 k N力加载循环,每种工况下分配试样数为5个～7个。引入“...开展了钛合金材料高温疲劳试验研究。试验共设计3种工况,即：200℃,0.5 k N-22.5 k N-0.5 k N力加载循环;300℃,0.5 k N-22.5 k N-0.5 k N力加载循环;200℃,0.5 k N-30 k N-0.5 k N力加载循环,每种工况下分配试样数为5个～7个。引入“肖维奈准则”对试验数据进行了筛选,通过寿命分布模型的检验,得到其有效数据点遵循正态分布模型的结论。根据试验数据分析了母体在三种工况下的中值疲劳寿命以及存活率为99.9%的疲劳安全寿命估计量,为相应工程提供基础数据。展开更多
文摘Corrosion test data were measured using non-destructive electrochemical techniques and analysed for studying inhibition effectiveness by different concentrations of NazCr207 on the corrosion of concrete steel-rehar in NaC1 and in H2SO4 media. For these, specifications of ASTM G16-95 R04 were combined with the normal and the Gumbel probability density functions as model analytical methods for addressing issues of conflicting reports of inhibitor effectiveness that had generated concerns. Results show that reinforced concrete samples admixed with concentrations having 4 g （0.012 7 tool）, 8 g （0.025 4 mol） and 6 g （0.019 l tool） NaaCr207 exhibited, in that order, high inhibition effectiveness, with respective efficiency, r/, of （90.46±1.30）%, （88.41＋2.24）% and （84.87±4.74）%, in the NaC1 medium. These exhibit good agreements within replicates and statistical methods for the samples. Also, optimal inhibition effectiveness model in the H2SO4 medium was exhibited by 8 g （0.025 4 mol） Na2Cr207 concentration having r/=（78.44±1.10）%. These bear implications for addressing conflicting test data in the study of effective inhibitors for mitigating steel-rebar corrosion in aggressive environments.
文摘Based on Princeton Ocean model, circulation in the Yellow Sea and East China Sea and its annual cycle are simulated. The model results show a weak countercurrent on the left side of the Kuroshio. The countercurrent separates from the main stream of the Kuroshio around 30°N, 128°E, where the Kuroshio turns right to the Tokara Strait it flows southwestward along isobaths, meets with the offshore branch of Taiwan Warm Current around 28°N. 124°E, then returns back and joins the main stream, so that a cyclonic circulation is formed. The center and strength of the countercurrent and cyclonic circulation exhibits seasonal variation. The lower layer cold water observed on PN section of the East China Sea in summer and autumn is considered to be associated with the modeled cyclonic circulation. According to Rossby's wake-stream theory, lateral friction may be the main mechanism of the countercurrent on the left side of the Kuroshio.
文摘开展了钛合金材料高温疲劳试验研究。试验共设计3种工况,即：200℃,0.5 k N-22.5 k N-0.5 k N力加载循环;300℃,0.5 k N-22.5 k N-0.5 k N力加载循环;200℃,0.5 k N-30 k N-0.5 k N力加载循环,每种工况下分配试样数为5个～7个。引入“肖维奈准则”对试验数据进行了筛选,通过寿命分布模型的检验,得到其有效数据点遵循正态分布模型的结论。根据试验数据分析了母体在三种工况下的中值疲劳寿命以及存活率为99.9%的疲劳安全寿命估计量,为相应工程提供基础数据。
