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排序方式: 共有125条查询结果,搜索用时 15 毫秒
121.
采用电化学技术和失重法研究了管线钢在两种碳酸盐溶液中的交流杂散电流腐蚀行为。在稀/浓两种碳酸盐溶液中,电化学实验结果表明:管线钢的极化行为表现为极化曲线发生电流振荡现象,振荡幅度随交流电流密度与直流电流密度的比值增大而增大,在腐蚀电位±100mV附近振荡最为显著。腐蚀失重实验结果表明:当交流杂散电流密度为0~20A/m^2时,发生均匀腐蚀且速率较小;当交流杂散电流密度为20~100A/m^2(浓碳酸盐溶液)或20~200A/m^2(稀碳酸盐溶液)时,发生均匀腐蚀且速率增大;当交流杂散电流密度为200~500A/m^2(浓碳酸盐溶液)或大于500A/m^2(稀碳酸盐溶液)时,发生局部点蚀。交流杂散电流造成的腐蚀量约为相同直流杂散电流造成腐蚀量的1%。 相似文献
122.
Soil polarization in pure forest stands affects the stability and sustainable development of the ecosystem. The most effective approaches to the prevention of soil polarization may be the use of forage... 相似文献
123.
Reyhaneh Hooshmandabbasi Ali Kazemian Holm Zerbe Mariusz P. Kowalewski Karl Klisch 《Reproduction in domestic animals》2021,56(9):1243-1253
Retention of foetal membranes (RFM) is a major reproductive disorder in dairy cows. An appropriate immune response is important for a physiological expulsion of the foetal membranes at parturition. Our study aims to provide a deeper insight into characteristics of foetal and maternal macrophages in bovine term placenta. We used transmission electron microscopy (TEM), immunohistochemistry and semi-quantitative RT-PCR to provide a deeper insight into characteristics of foetal and maternal macrophages in bovine term placenta. Semi-quantitative RT-PCR was used to define macrophage polarization in foetal and maternal compartments of normal term placenta. Gene expression of factors involved in M1 polarization [interferon regulatory factor-5 (IRF5), interleukin (IL)-12A, IL12B] and in M2 polarization (IL10) were studied. Ultrastructurally, foetal macrophages showed an irregular shape and large vacuoles, whereas the maternal macrophages were spindle shaped. By immunohistochemistry, macrophages were identified by a strong staining with the lysosomal marker Lysosome-associated membrane glycoprotein 1 (LAMP-1), while myofibroblast in the maternal stroma was positive for alpha-smooth muscle actin. We used the LAMP-1 marker to compare the density of foetal stromal macrophages in placentas of cows with RFM and in controls, but no statistically significant difference was observed. RT-PCR showed a higher expression of all studied genes in the maternal compartment of the placenta and generally a higher expression of M1-, compared to M2-associated genes. Our results indicated that at parturition placental macrophages predominantly show the pro-inflammatory M1 polarization. The higher expression of all the target genes in the maternal compartment may denote that maternal macrophages in bovine term placenta are more frequent than foetal macrophages. 相似文献
124.
Multiwalled carbon nanotubes-polymeric methyl red film modified electrode (MWNT-PMRE) was made. The electrochemical behavior of carbendazim on modified electrode was studied with Cyclic Voltammetry, Linear Sweep Voltammetry, Stable Polarization Method and Chronocoulometry. The results indicated that the electrical oxidation of carbendazim on MWNT-PMRE in H2SO4 supporting electrolyte with concentration of 0.6 mol/L was irreversible and was mainly controlled by diffusion. Some parameters of the electrochemical process were evaluated. The impacts of experiment conditions on the electrochemical behavior of carbendazim were studied. A good linearity relationship between peak current and concentration of carbendazim in the range of 2.0 × 10−7-1.0 × 10−5 mol/L was found, of which the equation was Ip(A) = −1.149 × 10−5 − 2.301c (mol/L), the correlative coefficient R = −0.9953 and detection limit was 9.0 × 10−9 mol/L. The recovery was between 90.3% and 94.7%. 相似文献
125.