全固化Nd:YVO_4绿光激光器

本文介绍了一种新型微型全固化绿光激光器。采用激光二极管端面泵浦nd：yVO4激光晶体，用kTP作为非线性倍频晶体，当泵浦光功率为360MW时，获得530nM波长、93MW的基横模绿光输出，总的光-光转换效率为24%

动物酵素营养液对繁殖母猪生产性能的研究

为验证“动物酵素营养液“对母猪生产性能的影响,选120头母猪进行饲养试验。结果表明,“动物酵素营养液“能够提高母猪群产仔率、成活率,平均窝产仔最多12.5头,成活率最高可达98%~99%,仔猪出生重为1.60千克/头,断奶后仔猪体重为11.2千克/头。猪无腹泻现象,长势快,皮毛光滑,整齐度提高,母猪妊娠期正常,产程时间少,无三炎,母猪健康,可在产后3~4天开始发情,配种率与受胎率均为100%,每年可产2.4窝,每头母猪与对照组的经济差额为4 520元

动物酵素营养液对保育猪呼吸道疾病影响的研究

本试验选择28日龄的仔猪,喂养动物酵素营养液至70日龄,结果表明:酵素组的仔猪中,康复率为75%,28.6%完全康复,57.1%转为轻微患病,14.3%处于严重状态,在对照组中只有40%完全康复,严重时有1头死亡,4头转为轻微患病,说明动物酵素营养液对仔猪呼吸道疾病有较好的促进康复的效果

ST段抬高型急性心肌梗死院前溶栓治疗中国专家共识

急性心肌梗死仍然严重威胁我国人民健康,在我国广大城乡地区,形势更为严峻[1,2]。及时救治急性心肌梗死患者,降低死亡率和保护心脏功能刻不容缓。鉴于我国的实际情况,院前溶栓治疗在大城市以外的城乡地区具有重要意义。为此,中国医师协会胸痛专业委员会及中国医学救援协会心血管急救分会专门组织有关专家制订了本共识,旨在帮助院前医疗急救人员对急性心肌梗死患者选择最佳

艾里克湖湿地植物群落特征指数与土壤因子的关系

应用双向指示种分类法(TWINSPAN)和典范对应分析法(CCA),对干旱区艾里克湖湿地植物群落特征指数与土壤环境因子的关系进行研究。结果表明,研究区的29种主要植物,隶属12科27属,分为4个种类组,大多数物种丰富度较低,其中胡杨、毛柽柳、芦苇和西伯利亚泡泡刺是最常见的种类。TWINSPAN分析表明,该区25个样地分为3个主要类型组,组1包括6个样地,组2包括18个样地,组3包括1个样地,分别代表不同土壤有机质、全氮、全磷含量的3种生境。CCA排序结果同TWINSPAN分类结果基本一致,反映出植物群落分布格局随土壤因子变化的趋势,确定了影响该区植物群落盖度的土壤因子为有机质、全氮、全磷

白杨河——艾里克湖湿地及周边植物群落与环境因子的关系

应用数量分类和排序方法,对新疆白杨河-艾里克湖湿地植被进行了多元统计分析。结果表明,该研究区域主要植被类型中共有植物18种,隶属10科,17个属。其中,多数植物种类在样方中出现的频次较低,说明该地区植物物种丰富度较低。TWINSPAN结果表明,该地区植物可以分9个种类组,与实际调查结果一致。CCA排序结果同TWINSPAN分类结果基本一致,反映出植物群落分布格局随环境因子梯度变化的趋势。分析了不同环境因子的关系,并从定量的角度,以CCA排序图直观的揭示了决定艾里克湖湿地植物群落分布的环境因子主要是地下水位、土壤有机质,其回归模型分别为:X_1=-0．6037L+0．6824(R~2=0．6024);X_2=0．74530M+0．1142(R~2 =0．6004)

Transmission and TransFormation of Gaussian Laser Beam through Optical Systems of the Complex-matrix Elements

本文导出矩阵元为复数的光学系统输出空间高斯光束参数普遍运用的计算公式，讨论了含有高斯孔径的傅里叶变换系统和梯度折射率系统的先学传递矩阵，文中给出这些系统的光束变换式系列，表明衍射角（λ/πω＿g）是高斯孔径的衍射效应因数。The general useFul calculating Formulas For the Gaussian beam parameters of output space of optical systems with complex-matrix elements are derived in this paper.Optical transFer matrices of the Fourier transForming system and the GRIN system in the presence of Gaussian aperture are discussed.And a.series of thransForm Formulas of these systems are glven.These Formulas show that the diFFractive angle(λ/πω_g)is the Factor of diFFracting eFFect For Gaussian aperture.福建省自然科学基

Several problems of evaluating laser beam quality of unstable cavity

本文详细论述了半导体蓝光激光器的应用前景、国内外研究动态以及量子阱半导体蓝光激光器件的结构与种类等。The purpose of research of beam quality has been discussed in this paper.The essense of measuring beam quality is considering the prerequisite of energy conservation,to deFine the propagation equation of beam.AFter analyzing Far Field diFFraction properties of virtual conFocal unstable cavity laser beam,it is concluded that the size of central diFFraction spot of annular aperture is smaller than that of circular aperture,whose diameter is same as that of annular aperture.The intensity of Former,however,is lower than that of latter.Likewise,the more narrow the annular aperture is,the smaller the central spot is.Meanwhile,the lower the intensity is.Additionally,the most of energy has been spread out and the Far Field divergence angle has been rised.DeFining beam width in term of energy percentage does not accord with propagation equation and the second moment of Far Field diFFraction intensity distribution of annular aperture beam is divergent,thereFore some basic diFFicults will be encountered when the beam quality of virtual conFocal unstable cavity is evaluated by β and M 2.By the way diFFraction-Free beam or supper diFFraction limiting beam also are discussed.Finally,some possible solutions of evaluating problems of unstable cavity laser beam quality has also been discussed

LD Pumped Microchip Nd∶YVO 4 Green Laser with Frequency Doubling

ld泵浦微片nd∶yVO4倍频绿光激光器1黄元庆叶艺文梅荣华（厦门大学新技术开发研究所厦门361005）ld（激光二极管）泵浦固体激光器，是80年代中期兴起的新技术，近年来发展极为迅速.这种全固化结构的激光器是一种高转换效率、高频率稳定性、窄谱线、微...A new structure of all solid state micro laser is presented.Nd∶YVO 4 crystal is end pumped by laser diode, and KTP crystal is used as a Frequency doubler.The output power of 9.3 mW of TEMoo mode laser at 532 nm has been obtained For pumping power of 360 mW, and the total optical to optical eFFiciency is 2.4 %