一类具有非线性控制和基层具有饱和吸收率的恒化器藻类模型(英文)

本文通过对藻类的增长率和基层的吸收率提出有生物意义的表达式,研究了一类具有非线性控制藻类恒花器模型.用定性理论证明了非线性控制可以使变产量的恒化器模型有一个全局渐进稳定的正平衡点.

Passively Mode Locked Diode-End-Pumped Yb∶YAB Laser with High Reflectivity Type Semiconductor Saturable Absorption Mirror

A novel high reflectivity type of semiconductor saturable absorption mirror grown by metal organic chemical vapor deposition is presented.Using the mirror as well as an end mirror,passively mode locked Yb∶YAB laser is realized,which produces a pulse as short as 3 05ps at 1 044μm.The pulse frequency is 375MHz;the output power is 45mW.

Flue gas desulphurization using sodium sulfide on pilot scale

A novel technique of flue gas desulphufization （FGD） using industrial sodium sulfide as absorbent is described to remove SO2 in flue gas. The FGD byproduct in this novel technique is sodium thiosuffate （Na2S2O3 · 5H2O, Hypo） which can be used as chemical raw material. Optimal operating parameters about this technique have been determined. In order to enhance productive efficiency of sodium thiosulfate, EDTA disodium additive is added into absorption solution to prevent oxidation of sodium thiosulfate. Its optimal concentration is 0. 02 wt. %. The pH value of absorption solution is set in the range of 5 ~ 6.5. Experimental results show that SO2removal efficiency averagely reach 98.72 %. The highest productive efficiency of sodium thiosulfate reaches 83.24 %. The sodium thiosulfate formed during FGD can be separated from saturated absorbent by filtration, concentration and crystallization. The filtrate after separating sodium thiosulfate will be reused as SO2 absorbent by replenishing some fresh sodium sulfide.

一个新的氧吸收法被动测距公式

基于氧气A吸收带的被动测距技术已成为单站被动测距领域最具活力的研究课题之一,但是由于氧气吸收饱和区的存在,限制了被动测距的最大可达范围。采用具有1 cm–1分辨率的Modtran软件进行了分光谱透射率计算,通过数据建模获得了基于目标天顶角和平均氧气吸收率的被动测距公式。该公式避免了氧气吸收率曲线的饱和区,使得氧吸收法的有效距离估计范围可延伸到50 km。此外,该公式还有对吸收率测量误差不敏感的特性,例如,在零海拔处传感器最小可检测的吸收率Aˉ=10-2的偏差,所能产生的距离偏差不超过50 m。该结论有望突破绝大多数氧吸收法被动测距实验局限于较近距离的现状,促进其实际应用。