几种超氧化物歧化酶测活方法灵敏度的研究

比较了黄嘌呤氧化酶－ＮＢＴ法、改良的邻苯三酚自氧化法、经典的邻苯三酚自氧化法、ＮＢＴ光还原法、肾上腺素自氧化法等５种ＳＯＤ测活方法的灵敏度及某些因素对灵敏度的影响．结果表明：黄嘌呤氧化酶－ＮＢＴ法灵敏度较高；Ｏ－·２的生成速率对这些方法的灵敏度有较大的影响     

Hilbert空间中k—严格伪压缩映像不动点的迭代算法

给出了Hilbert空间中k-严格伪压缩映像不动点的一个迭代算法,并利用所给出的算法证明了一个强收敛定理.     

Investigations of high-pressure and high-temperature behaviors of the newly-discovered willemite-Ⅱ and post-phenacite silicon nitrides

Using the first-principles method of the plane-wave pseudo-potential, the structural properties of the newly-discovered willemite-Ⅱ Si3N4 （wⅡ phase） and post-phenacite Si3N4 （δ phase） are investigated. The α phase is predicted to undergo a first-order α→wⅡ phase transition at 18.6 GPa and 300 K. Within the quasi-harmonic approximation （QHA）, the α→wⅡ phase boundary is also obtained. When the well-known β→γ transition is suppressed by some kinetic reasons, the β→δ phase transformation could be observed in the phase diagram. Besides, the temperature dependences of the cell volume,thermal expansion coefficient, bulk modulus, specific heat, entropy and Debye temperature of the involved phases are determined from the non-equilibrium free energies. The thermal expansion coefficients of wⅡ-Si3N4 show no negative values in a pressure range of 0-30 GPa, which implies that the wⅡ-Si3N4 is mechanically stable. More importantly, the δ-Si3N4 is found to be a negative thermal expansion material. Further experimental investigations may be required to determine the physical properties of wⅡ- and δ-Si3N4 with higher reliability.     

以虚拟仪器为平台的声学实验

基于计算机声卡和Adobe Audition软件制作了声学虚拟仪器,可实现示波器、信号发生器和频率计算仪器功能,并介绍了此声学虚拟仪器在双音多频信号DTMF的研究、声速的测量和变音钟实验中的具体应用.     

机器人路径规划算法及其应用

本文研究环境已知条件下的移动机器人路径规划问题,提出了一种基于人工神经网络的路径规划算法,所提算法可以规划出折线型的最短路径,并且计算简单,收敛速度快。将所提算法应用于机器人“Khepera“,通过模拟实验,表明所提算法有效。     

类金属卟啉化合物的共振拉曼光谱与分子振动

概述卟啉及其金属配合物不仅对于生命科学研究具有重要意义，而且在技术领域也有着广泛的应用。卟啉所具有的高对称性（近似为Ｄ４ｈ）和独特的电子结构也引起了光谱学家和理论化学家的广泛兴趣。七十年代以来，共振拉曼光谱（ＲＲＳ）广泛地用于研究金属卟啉及其相应的生...     

RESEARCH ANNOUNCEMENTS On the Diophantine Equations ax~n-1/ax-1=y~2 and ax~n 1/ax 1= y~2

In this paper,we apply the extension of the St(o|¨)rmer theorem on the Pell equ-ation to the following equations(2)and(3),to obtain some more deep results.For example,a famous result of Ljunggren,can be concluded from a simple Coro-llary of Theorem.     

On the Diophantine Equation x~4- Dy~2= 1

ＯｎｔｈｅＤｉｏｐｈａｎｔｉｎｅＥｑｕａｔｉｏｎｘ~４－Ｄｙ~２＝１ＳｕｎＱｉ（孙琦）ＴｈａｎＰｉｎｇｚｈｉ（袁平之）（ＳｉｃｈｕａｎＵｎｉｖｅｒｓｉｔｙ，Ｃｈｅｎｇｄｕ，Ｓｉｃｈｕａｎ，６１００６４）ＣｏｍｍｕｎｉｃａｔｅｄｂｙＫｅＺｈａｏＲｅｃｅｉ...