抑制换热器湿空气侧结霜的研究

In this paper, there are some physical and mathematics models established about preventing frostdeposit on wet air side of heat exchanger. The effectiveness has been proved both theoretically and practically to prevent the frostdeposit in a wet air side of heat exchanger covered with high hydrophobic film. The study results would been shown in two aspects. First, the frost is formed on the surface itself, that is the phenomena in the initial stage of frost formation. Second, dust particles from the air stream can form ice crystals, and the crystals deposit on the surface.

芦苇产量与植株吸收氮磷钾比例关系的研究

在不同的条件下,土壤中氮磷钾含量及其不同施肥量和施肥比例对芦苇产量有较大的影响。特别是芦苇对氮磷钾的吸收利用受这些条件所制约。当条件良好时,植株能够有效地利用氮磷钾等元素,建造身驱,形成较高的产量;当条件降低或土壤溶液中营养元素的综合平衡受到破坏时,芦苇产量就发生变化。但是,芦苇一生中对氮磷钾的需要如何,其吸收比例与产量的关系如何,目前尚没有这方面的报道。我们通过试验和长期的田间调查及合理施肥进行:施肥比例与芦苇产量的关系。

苇田施硅肥的效果研究

在溶液培养条件下，10mg／kg的有效硅就可以满足芦苇实生苗的生长需要，使干重增加80．6％；在田间条件下，当施氮水平一致时，24kg／hm2的构溶性硅可使芦苇增产34．1％，且品质得到改善，经济效益显著。