温度对氨法脱硫率影响的实验研究

对使用氨（NH3）脱除烟气中气态污染物的技术进行了分析和总结，认为氨洗涤法洗涤净化烟气是一种很有前景的方法，并就温度对SO2脱除率的影响进行了实验研究。实验研究结果显示，当温度超过54℃时，NH3对SO2仍有很高的脱除率。并根据实验结果建议，在实际氨法脱硫工程中，脱硫过程温度宜控制在60℃以下或在80℃以上。     

Integration of cerium chemical forms and subcellular distribution to understand cerium tolerance mechanism in the rice seedlings

Environmental Science and Pollution Research - Rare earth elements (REEs) accumulate in the soil and ecosystem. Cerium (Ce) is one of the main additives in REE-containing fertilizers. However,...     

廊坊市生态环境与土地利用协调研究

通过对廊坊市环境容量现状和土地利用与生态环境关系的分析,提出了廊坊市生态适宜的土地利用目标和调控指标,从而构建环境友好型土地利用模式。     

采用神经网络半主动模糊控制系统提高桥梁结构的安全性

研究了桥梁结构的半主动控制对提高桥梁结构安全性的作用 ,在算法上采用基于神经网络的模糊控制 ,不需要建立精确的分析模型 ,计算较为简便 ,避免了多参量建立的模糊关系方程的求解困难。数值结果表明 ,笔者提出的半主动控制系统对减小结构的地震响应是有效的     

Co- and tri-generation system based on absorption refrigeration cysle: a review

ABSTRACT

Absorption refrigeration system is a heat-driven refrigeration system, which has a good application prospect in co- and tri-generation system, and is of great significance to energy conservation and emission reduction. In this paper, the combined power and cold system the combined power and cooling system and the combined cold cooling, heat, and power system based on absorption refrigeration are reviewed. Working fluid of absorption refrigeration cycle, different configurations, system performance, main application fields, and economic considerations of co- and tri-generation systems were focused in this review. This paper will be useful for the researchers to have a more comprehensive understanding of the application and development prospect of co- and tri-generation systems based on Absorption Refrigeration Cycle.     

The effects of cerium on the growth and some antioxidant metabolisms in rice seedlings

Introduction

The aims of the present study are to investigate the effects of Ce³⁺ on the growth and some antioxidant metabolisms in rice seedlings (Oryza sativa L. cv Shengdao 16).

Materials and methods

The rice was treated with 0, 0.05, 0.1, 0.5, 1.0, and 1.5?mM Ce³⁺, respectively. The growth index of rice was measured. The chlorophyll content; catalase, superoxide dismutase, and peroxidase activities; and the level of hydrogen peroxide (H₂O₂), superoxide anion (O ₂ ^·? ), and malondialdehyde were assayed. The accumulation of Ce³⁺ and the uptake of mineral nutrition elements were analyzed with ICP-SF-MS.

Results and discussion

Hormetic effects of Ce³⁺ on the growth and some antioxidant metabolisms were found in the roots and shoots of rice. The roots can accumulate a much higher content of Ce³⁺ than shoots and Ce³⁺ mainly located in the cell wall of roots. Moreover, the uptake of K, Mg, Ca, Na, Fe, Mn, Zn, Cu, and Mo in the roots and shoots was affected with the exposure of different Ce³⁺ treatments, which indicated that Ce³⁺ affected the nutritional status of roots and shoots and further affected the growth of rice.

Conclusion

The appropriate amount of Ce³⁺ improved the defense system and growth of rice. The roots can accumulate a much higher content of Ce³⁺ than shoots. Moreover, the uptake of K, Mg, Ca, Na, Fe, Mn, Zn, Cu, and Mo in the roots and shoots was affected with the exposure of different Ce³⁺ treatments.