1kW无氦横流连续CO_2激光器的研究

本文报道我们研制的 Ikw无 He横流连续CO_2激光器的实验结果。激光器总体结构如图1所示。其放电装置采用针板放电结构，阴极由152根直径为      

Bifurcation,Bi—instability and Area Principle for the Solitary Waves of the Nonlinear Wave Equation with Quartic Polynomial Potential

For the nonlinear wave equation with quartic polynomial potential,bifurcation,bi-instability and solitary waves are investigated.An area principle based on the bifurcation diagram is found for the existence of bright and dark solitary waves and shock waves.The simple forms of solitary wave solutions are given by an approximate analytic method.     

OPTICAL EFFECTS AND MICROSTRUCTURE OF BURIED INSULATOR LAYER FORMED BY O~+ AND N~+ CO-IMPLANTATION

The microstructure and optical properties of a buried layer formed by O~+(200keV,1.8×10~(18)/cm~2)and N~+(180 keV,4×10~(17)/cm~2)co-implantation and annealed at 1200℃for 2 h have been investigated by Auger electron,IR absorption and reflection spectroscopicmeasurements.The results show that the buried layer consists of silicon dioxide and SiO_x(x< 2)and the nitrogen segregates to the wings of the buried layer where it forms an oxynitride.Bydetail theoretical analysis and computer simulation of the IR reflection interference spectrum,therefractive index profiles of the buried layer were obtained.     

An Equivalence Proposition of Factorial Monoids

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腐植酸类肥料的多种功能和肥效分析

腐植酸类肥料是养地增产的好肥料腐植酸类肥料,是在“农业学大寨”的群众运动中,广大劳动人民大搞综合利用,就地取材,就地制造,就地施用,发展起来的新的肥料品种。它含有大量有机质,具有农家肥料的多种功能;含有一些速效养分,兼有化肥的某些特性。一般称它为有机无机肥料(或有机矿物肥料),简称“有机化肥”或“腐肥”。十几年来,特别是文化大革命以后,经全国各地试验、推广,增产效果肯定,深受贫下中农欢迎。实践证明:腐肥可以改良土壤,提高土壤肥力,做到用地、养地相结合;可以捉苗、发根、早成熟、壮籽粒,不仅当年增产,而且有后效。由于就地取材,便于自己动手制造和施用腐肥,节约了开支,降低了成本,做到了增产增收。从各地施用情况看,增产幅度一般在10—30%左右,每斤腐植酸铵增产粮食约半斤到一斤。盐、碱、涝、洼以及土质贫瘠的地区,增产幅度更大些。只是个别地块,因肥料质量差,施肥方法不当,或其他原因,造成增产幅度不大。但总的来说,它是养地增产的好肥料。腐肥的特点是含有较高量的“腐植酸”。腐植酸是     

千瓦级横流连续CO2激光器流场特性的研究

本文针对MGL-84型千瓦级横流CO2激光器,深入研究了流场气动特性对激光放电的影响,提出了使流场速度分布更加均匀的措施,所设计的湍流发生器明显地改善了放电稳定性。     

WiMAX无线网络规划方法研究

随着WiMAx技术的不断成熟和普及，WiMAX无线网络开始在全球范围内广泛地部署。文章介绍了WiMAX无线网络的特点，重点讨论了WiMAX无线网络的规划流程以及各个阶段的规划内容和方法。     

遗传算法在漫反射系数计算中的应用研究

从一般的目标星等模型出发,利用遗传算法对模型中的漫反射系数进行求解.根据星等测量中存在的星等值起伏的特点,设计了多变点分段遗传算法进行漫反射系数的估计,给出了遗传算法具体的算法设计,并以类圆柱体目标为例分析了算法参数中变点数量选取对计算结果的影响,在合理选择参数的条件下,算法可以较好地逼近目标参数.     

Humidity Effects on Imaging and Nanomanipulation of Individual DNA Molecules on HOPG Surface

Single DNA molecules are aligned on highly ordered pyrolytic graphite （HOPG） surface in ambient air. It is shown that environmental humidity has a remarkable influence on the measured height of DNA by atomic force microscopy （AFM）, probably due to the conformation transition of DNA. We also demonstrate that DNA molecules deposited on HOPG surface can be ＇pushed＇ much more easily by AFM tip at high humidity than at 10W one.     

MnαTi1-α催化剂NH3选择性催化还原NO的中低温活性及机理研究

采用浸渍法制备了不同MnO_x负载量的SCR催化剂,检测其在中低温下的脱硝活性和抗SO_2中毒性能,并分析影响Mn_αTi_(1-α)催化剂中低温活性的机理。采用BET、XRD、XPS、NH_3-TPD和H_2-TPR对催化剂表征。研究表明,随着MnO_x负载量的增加,Mn_αTi_(1-α)催化剂最高脱硝活性温度区间向低温区移动,Mn_(0.1)Ti_(0.9)催化剂在200-385℃脱硝效率达80%以上。SO_2会造成Mn_αTi_(1-α)催化剂脱硝活性显著下降,且不可逆。当MnO_x负载量增加时,催化剂比表面积先增大后略微减小、H_2-TPR中Mn~(4+)峰面积增大、表面化学吸附氧增加,有利于NH_3-SCR反应在低温下的进行。Mn_αTi_(1-α)催化剂的酸性位点随MnO_x含量增加而增多,H_2还原峰出现温度较低,表明Mn_αTi_(1-α)催化剂具有良好的中低温氧化还原性。