球形汞膜电极倒导数恒电流溶出分析法研究

本文推导并验证了球形汞膜电极倒导数恒电流溶出分析法理论。确定其理论的应用条件为汞膜厚度不超过4.6×10~(-4)cm,探讨了噪音对灵敏度的影响。     

Laser performance of monolithic Cr,Nd:YAG self-Q-switched laser

The self-Q-switched laser performance of monolithic Cr⁴⁺,Nd³⁺:YAG concave-planar resonator with 5-mm length was studied experimentally and theoretically. The slope efficiency is as high as 24% and pump threshold is as low as 64 mW. The pulse width, the single pulse energy and the pulse repetition rate of monolithic Cr,Nd:YAG self-Q-switched laser were measured as a function of absorbed pump power. With the increase of pump power, the pulse width decreases and the pulse energy and the pulse repetition rate increase. The average output power of 91 mW with pulse width of 7 ns at repletion rate of 35.5 kHz was obtained at the maximum absorbed pump power of 440 mW, the peak power is as high as 370 W. The theoretical prediction of pulse energy, pulse width and pulse repetition rate as a function of absorbed pump power based on rate equations is in a good agreement with our experimental data. This can lead to develop the diode laser-pumped monolithic self-Q-switched solid-state microchip lasers.     

未来重要光源——发光二极管

在电灯发明之后的100多年里,照明技术的不断发展使白炽灯和荧光灯面临着严重的威胁.特别是发光二极管技术的逐步成熟,引发了照明光源的一场技术革命.不仅仅是红绿灯,在大型屏幕显示、室内照明、汽车车灯、广告标志等所有需要光亮的地方,发光二极管都将取代传统的照明设备,成为未来的重要光源.     

黑卵蜂寄主识别利它素的性质研究

通过盐析、柱层析和分子筛层析，从松毛虫雌蛾附腺中分离到一种ＳＰ－Ｉ组份，经生化方法检测鉴定，此组份是一种糖蛋白，分子量为１．３５×１０５，等电点为４．２，蛋白质含量９２％，糖含量８％．它能引诱松毛虫黑卵蜂和松茸毒蛾黑卵蜂在非天然寄主上的产卵检查、刺探行为，是一种黑卵蜂寄主识别利它素．     

ON Δ-GOOD MODULE CATEGORIES OF QUASI-HEREDITARY ALGEBRAS

A useful reduction is presented to determine the finiteness of △-good module category F(△)of a quasi-heredltary algebra. As an application of the reduction, the f(△)-finitenetess of quasi-hereditary M-twisted double incidence algebras of posets is discussed. In particular, a complete classification of F(△)-finite M-twisted double incidence algebras is given in case the posets are linearly ordered.     

La(OH)3凝聚的形态和粒径分布研究

在形态空间中对La(OH)_3凝聚体系统的形态分布进行了描述。在此基础上, 对La(OH)_3凝聚体的粒径分布进行了模拟, 进而提出了La(OH)_3凝聚体的形成机制。     

Lipschitz局部严格伪压缩映象的迭代逼近

设Ｋ是一致光滑Ｂａｎａｃｈ空间Ｋ的非空子集，Ｔ：Ｋ→Ｘ是Ｌｉｐｓｃｈｉｔｚ局部严格伪压缩映象。本文给出一个迭代序列强收敛到Ｔ的唯一不动点，并给出一个涉及Ｌｉｐｓｃｈｉｔｚ局部强增殖映象Ｔ的非线性方程Ｔｘ＝ｆ的解的迭代逼近。     

Direct measurement of free-volume hole distributions in polymers by using a positronium probe

We have directly measured the free-volume hole distributions in semicrystalline polypropylene by positron lifetime annihilation spectroscopy. A Laplace inversion technique was engaged to analyze the positron lifetime spectra measured under quasi-isotropic external pressures of 0, 4.2, and 14.7 kbar into continuous lifetime distributions. The hole radii distributions as determined from the ortho-positronium lifetime distributions are found to be between 4.0 and 0.5 Å and to have maxima at 3.0, 1.9, and 1.1 Å under the external pressures of 0, 4.2, and 14.7 kbar, respectively. © 1992 John Wiley & Sons, Inc.     

Vortex breakdown over a delta wing with oscillating leading edge flaps

 The effects of oscillating leading-edge flaps on leading-edge vortices and vortex breakdown were investigated for a delta wing with upward-deflected flaps. The variation of breakdown location revealed hysteresis loops. The time-averaged breakdown location over one cycle may move upstream or downstream compared to the quasi-steady case, depending on the amplitude of flap oscillations and angle of attack. Measurements of the phase-averaged velocity upstream of breakdown did not reveal any correlation to the response of breakdown location. The effect of oscillating flaps is largest when the breakdown location is near the trailing-edge region in the static case. Received: 2 February 1997/Accepted: 7 April 1997     

实际光栅系统分辨本领的实验验证

本文通过光栅衍射实验对钠光双线结构的观测，验证了实际光栅系统的分辨本领。