Ce4＋对玉米根尖细胞微核及有丝分裂的影响

用不同梯度质量浓度的硫酸高铈对玉米根尖细胞进行染毒处理，结果表明，当Ce4 质量浓度≥10mg／L时，玉米根尖细胞的微核率上升显，当Ce4 质量浓度达到1000mg／L时，玉米根尖细胞的有丝分裂指数具有显性下降．提示一定质量浓度的铈化合物对玉米根尖细胞具有一定的遗传毒性和细胞毒性．     

单区域系统积差调频的改进与仿真

就单区域系统对积差调频方法进行了分析和改造,并用MALAB对其进行了仿真,仿真结果表明：改进后的比例-积差调频动态性能和稳定性有明显的提高.     

激光二极管泵浦Nd：YVO4／LBO腔内倍频瓦级连续波绿光激光器

报道一种激光二极管端面泵浦ＮｄＹＶＯ４晶体、ＬＢＯ腔内倍频的全固态瓦级连续波（ＣＷ）绿光激光器。对ＬＢＯ采用Ｉ类非临界相位匹配（ＮＣＰＭ）、温度调谐，当泵光功率为５．５Ｗ时，获得了１．２ＷＴＥＭ００模５３２ｎｍ连续波绿光输出，光－光转换效率达２２％，电－光转换效率达３％。     

Frequency offsets in frequency-locked semiconductor lasers

A commonly used technique for frequency locking a laser is dithering the laser frequency and monitoring the first derivative of the laser transmission through an absolute reference. In semiconductor lasers, this frequency dithering can be obtained easily by dithering the injection current. However, this dithering also modulates the laser output power. Here we show that this modulation of the laser output power results in an offset of the locked laser frequency from the reference frequency. We derive analytical expressions for these frequency offsets for semiconductor lasers frequency-locked to a Fabry-Perot transmission peak, a Gaussian absorption line, and a Lorentzian absorption line.     

双狭缝相机对线状等离子体均匀性的监测

首次使用双狭缝相机对“神光”装置南路倍频线聚焦激光打靶所形成的线状等离子体均匀性进行了监测。由于实验条件的限制，相机的测量位置不太理想。为此，我们进行了修正，本文即是在修正基础上给出实验结果。修正后的结果表明，“神光”装置南路倍频线聚焦激光打靶部分发次所形成的线状等离子体均匀性不够理想。     

阻容耦合放大器电路通频带的计算

本文通过对一个具体电路的—3dB带宽的计算,即上限截止频率和下限截止频率的计算,分别介绍了计算通频带的方法。     

工作点测量系统在合肥光源的应用研究

 介绍了利用合肥光源(HLS)的工作点测量系统进行一些束流参数的测量及其应用研究，这些参数包括工作点、β函数；自然色品以及中心频率。同时还进行了清洗电极对工作点的影响的测量。给出了一些测量结果，测量结果与理论计算值相当吻合。     

短波FH／MFSK编码系统中部分频带单音阻塞的性能

研究了带反馈链路的选择式频率分集的短波信道ＦＨ／ＭＦＳＫ编码系统，在具有加性白高斯噪声（ＡＷＧＮ）的瑞利衰落信道中，存在部分频带单音阻塞时的性能，并给出了采用ＲＳ码、双－ｋ码、重发码时，无编码与有编码系统的码符差错率与比特能量噪声比的关系曲线．     

In VivoLongitudinally Detected ESR Measurements at Microwave Regions of 300, 700, and 900 MHz in Rats Treated with a Nitroxide Radical

A signal detector of longitudinally detected ESR (LODESR) is independent of the resonant frequency. We developed anin vivoLODESR spectrometer operating in the regions of 300, 700, and 900 MHz. Using this apparatus, we estimated signal intensities at different operating frequencies obtained from non- or high-dielectric loss phantoms that contained nitroxide radical solutions and from live rats that had received a nitroxide radical. Our result, higher signal intensities in the high-dielectric loss samples (such as physiological saline solution and animals) at a lower frequency, shows that the influence of a decrease in dielectric loss dominates over the signal reduction caused by smaller Zeeman splitting. We believe that this finding strongly supports anin vivoESR resonant frequency that tends to be low.     

Factorial orthogonality in the presence of covariates

Summary The present paper obtains necessary and sufficient conditions for factorial orthogonality in the presence of covariates. In particular, when interactions are absent, combinatorial characterizations of the conditions, as natural generalizations of the well-known equal and proportional frequency criteria, have been derived.