西昌市创建国家森林城市的可行性分析

在"一办三创"成果的基础上,优异的自然经济环境和已具备的创建基础等条件,为西昌市创建国家森林城市奠定了较坚实的基础,但同时也存在着绿地面积不足、结构不合理以及本土特色不明显等问题。因此只有借鉴其它森林城市成功经验,注重科学规划、合理布局,打造地方特色的精品工程,才能使西昌市创建国家森林城市成为可能。     

Validation of three infiltration models on purple soil under simulated rainfall

So as to find models suitable for the prediction of water infiltration in purple soil,infiltration rates simulated by three popular empirical infiltration models,Horton model,Kostiakov model,and the modified Kostiakov model,were compared by using those observed results on slope in purple soil under rainfall simulation.28 sets of infiltration data were divided into two parts for parameter estimation and validation independently.The performance of the three infiltration models was evaluated with the Nash and Sutcliffe efficiency criterion.The results show that the percent for Nash and Sutcliffe efficiency greater than 0.7 is about 69.7% for the Horton model,and 48.48%,and 54.55% for the Kostiakov model and the modified Kostiakov model,respectively.Horton model is better than Kostiakov model and the modified Kostiakov model in most rain events in the field.However,Kostiakov model is still suitable for reasonable prediction of the infiltration in purple soil sloping farmland because fewer parameters are needed.Furthermore,rainfall intensity has significant effects on the parameter values used in the simulation models.The simulation results can be improved by choosing suitable parameters according to the rainfall intensity.     

基于粗糙集的科技项目团队能力评估分析研究

针对科技项目团队能力评估问题进行了研究，引入粗糙集和信息熵理论，总结以往项目经验，建立了基于粗糙集的团队能力指标评价模型。最后通过实例分析，对该模型的科学性和可行性进行了验证。     

人眼安全2μm全固态激光器

近年来,由于人眼安全的2μm波段激光在军事,医疗,遥感方面日趋广泛的应用,对高效,紧凑,长寿命,稳定性好的激光器的需求越来越迫切。本文就目前国内外2μm波段全固态激光器的现状作了详细的介绍,并在提高2μm全固态激光器输出功率的前景方面提出了一些自己的建议。     

基于LabVIEW的环境检测系统设计

本设计采用目前最为先进的虚拟仪器技术,以LabVIEW 7.1为虚拟仪器开发平台开发设计环境检测系统的界面,包括对温度、可燃性气体浓度和光照度的数据采集和记录,并对超量的参数进行视觉和听觉报警。     

适于MEMS加速度计读出电路带宽可调的低通滤波器

提出了一种适于MEMS电容加速度计读出电路带宽可调的低通滤波器,带宽调节范围为100Hz～8kHz。信号频率低于500Hz时选用开关电容低通滤波器,高于500Hz的信号则由连续时间低通滤波器来处理。该低通滤波器采用1.2μm的2P2M的N-阱CMOS工艺实现。设计中分析并解决了因时钟信号引起的制约开关性能的因素:优化的开关时序消除了电荷注入引起的非线性;时钟馈通敏感节点增加虚拟开关抵消了耦合电荷;高PSRR共源共栅折叠式差分输入结构,有效地抑制了来自电源的干扰,改善了电路的性能。     

长春地区外来植物的初步研究

本研究对长春地区外来植物进行了调查,列出长春市外来种名录,确定共有外来植物46种,隶属于20科,菊科植物占30.4%。分析了长春市外来植物的来源,得出有50%的外来植物来自美洲。这些数据和结果可为外来物种的规范管理及对外来物种的生态入侵风险分析提供科学依据。     

Determining method and conditional factors of electrochemical fingerprint of Chinese traditional medicine

The thermodynamic systems and kinetic model suitable for the electrochemical token of the compo-nent throng in Chinese traditional medicines have been analyzed. It has been indicated that the damp oscillatory reactions in the non-equilibrium close system and open system without the supplement of dissipative substance have important significance for the throng token and analysis of chemical com-ponents in Chinese traditional medicines. Various factors influencing the electrochemical fingerprint,such as reactant species and their concentrations,electrode types,temperature,stir rate,the kind,dosage and granularity of Chinese traditional medicines,have amply been researched by the B-Z os-cillatory reaction which used malonic acid as a main dissipative substance. In addition,the quantitative information about the chemical components in Chinese traditional medicines has been discussed in detail. The method and its conditions for determining the electrochemical fingerprint used in scientifi-cally distinguishing and evaluating Chinese traditional medicines have successfully been put forward.     

透射型亚波长二元闪耀光栅的数值模拟与分析

使用OptiFDTD对透射型亚波长二元闪耀光栅的透射场进行了数值模拟;使用FFT方法对电磁场分量进行分析,得到其各个级次的能量分布,进而分析了亚波长结构二元光栅的各个参数对衍射性能的影响。分析结果证实:透射型亚波长二元闪耀光栅可将正入射的TE波闪耀到 1级,且等分数对衍射角影响很小。给定波长,其设计主要由光栅周期、光栅材料折射率和等分数这3个参数决定。     

不同品种胡萝卜中β-胡萝卜素的测定与分析

利用紫外分光光度法测定了27个不同品种，同一品种不同产地胡萝卜中所含的β-胡萝卜素含量。结果表明：品种中加一号胡萝卜所含β-胡萝卜素最高，达平均400．08mg／100g，其次是红芯六号，达平均272．86mg／100g，第三是含量较高的日本特选金笋六寸，平均含量达270．42mg／100g，石河子品种新胡萝卜一号所含β-胡萝卜素也较高。而同一品种不同产地的新黑田五寸胡萝卜所含隆胡萝卜素也有差别，但是都在150mg／100g左右。本实验的研究为胡萝卜育种，加工食品胡萝卜原材料的选材有重要的指导意义。