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xfgzju木虫 (正式写手)
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[求助]
请牛人把下面的换一个表达方式
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| Four limestone samples were used to evaluate the protective ability of polymers against acid rain attack. One sample was left untreated as blank. Another three samples were treated on all faces with HBA/D230/TiO2 polymers. Samples were sprayed with H2SO4 solution (pH 4.0) by periodic spraying as we designed before [12]. In the simulation process, the samples were placed at a 45° angle in a glass funnel. The volumetric flow rate of solution was adjusted at 10 mL•min-1 and the stone blocks were carefully moved every 10 min in order to spray acidic solution on entire available surface of the samples. The total amount of solution volume for each spray was 1000 mL, and then the samples were dried in the air at room temperature for one day in order to achieve the effect of drying-wetting cycles. Each spraying was formulated by a new sulfuric acid solution (pH 4.0). The periodic spraying was repeated 10 times. The run-off solution was collected at the end of each experiment. |
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818james
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3楼2016-02-11 17:52:31
818james
铜虫 (著名写手)
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【答案】应助回帖
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把下面的换一个表达方式 The tapes were stuck to the stone surface and smoothed with gentle finger pressure, and were then removed by pulling at an angle of 90°, and weighed on a balance with sensitivity of 0.0001 g. The peeled off material was determined as the difference between the weight of the tape after removal from the surface and the weight of the clean tape before application. Stick the tapes on the stone surface and smooth them gently, then remove them by pulling from an angle of 90°, and weigh them accurately to 0.0001 g. The weitht of the peeled off material is the weight of the tape after removal from the surface minus that of the clean tape before application. |
2楼2016-02-11 17:46:09
