基于ARIMA模型的山东省GDP的分析与预测

对1975-2015年山东省国内生产总值进行分析,运用统计学原理,建立了ARIMA(1,1,1)模型,检验结果表明该模型具有良好的预测效果,可为山东制定经济发展目标提供决策参考.     

SAPO—11分子筛的酸性及催化性能

用IR及TPD法研究了SAPO-11分子筛的表面酸性质,并以正庚烷裂解和乙醇脱水为探针研究其催化性能。结果表明,SAPO-11分子筛上既有L酸中心,又有B酸中心,表面上存在4个羟基峰。NH_3-TPD测定了SAPO-11的酸强度和酸中心数,并用矩形法求得脱附活化能,SAPO-11系属中等酸强度的分子筛。     

吗啉二硫代氨基甲酸铁(Ⅲ)配合物Fe(S2CNC4H8O)3的合成、表征及晶体结构

合成了标题化合物Fe(S2CNC4H8O)3,得到黑色柱状晶体.晶体属三斜晶系,空间群为P-1,晶胞参数a=O.9300(2)nm,b=1.0490(2)nm,c=1.3710(3)nm,a=100.60(3)°,β=95.40(3)°,γ=106.60(3)°,V=1.2445(4)nm3,Mr=542.58,Z=2.中心Fe原子分别与来自三个吗啉二硫代氨基甲酸的六个硫原子配位形成八面体构型,由于四元螯合环的环张力,导致该八面体严重变形,六个Fe-S键的键长范围在0.2423(5)～O.2458(2)nm.热分析表明标题化合物在791.80℃完全分解.     

Diode-pumped efficient laser action of Yb~(3+):LYSO crystal

Effective diode-pumped continuous wave (CW) tunable laser action of a new alloyed crystal Yb:LYSO is demonstrated. The alloyed LYSO crystal possesses the desirable physical and laser performance of La2SiO5 (LSO), as well as the favorable growth properties and costs of Y2SiO5 (YSO) in the same time. With a 5 at.-% Yb:LYSO sample, the output power of 2.84 W at 1085 nm and an optical-to-optical conversion efficiency of 54.5% are achieved. Its laser wavelength can be tuned over a broad range of 81 nm, from 1030 to 1111 nm.     

浅议CDMA扩频通信技术

 CDMA是英文CodeDivisionMultipleAccess的缩写,直译为码分多址,是一种以扩频通信为基础的载波调制和多址接入技术。CDMA最早的标准是由美国高通公司提出来的,并于1990年7月31号公布发表,现在主要使用地区及国家有韩国、日本、美国等,我国也开始使用这一移动通信技术标准。CDMA是为现代移动通信网大容量、高质量、综合业务、软切换及国际漫游等要求而设计的一种移动通信技术。一、CDMA扩频通信的工作原理CDMA采用扩频技术,扩频是指发送信号所在点频谱远大于信息本身所需的最小带宽,是将窄带的信息信号调制到很宽的频带上。     

一种基于小波变换的红外小目标去噪算法

 研究了复杂背景下红外小目标图像的去噪问题，鉴于小波阈值法去噪的缺点，结合小波变换的去相关性和能量紧支性，提出一种新的去噪方法。考虑到实际中的复杂背景和大量干扰，弱小目标通常占有很少像素，首先对红外小目标图像进行二级小波变换，然后根据新的算法对变换所得小波细节系数进行邻域运算，最后通过小波逆变换得到处理后的图像。 实验中采用Db3小波基函数，分别对两帧低信噪比原始图像进行仿真。仿真结果表明，该算法能很好地保存小目标的形状特征，抑制背景，达到较好的去噪效果。     

Magnetic and Microstructure of Triple C/Co73Cr22Tas/Ti for Perpendicular Media

The magnetic properties and microstructure of triple C/CoCrTa/Ti perpendicular recording films have been studied. Magnetic measurements show that the optimal thickness of Ti underlayer is 4Ohm and that of CoCrTa is 35 nm. The optimal value of substrate temperature is found to be 400℃. A suitable Ti underlayer causes a magnetic layer to have a near-perfect hcp texture, with Co grains in the （002） preferred orientation. The film with needle-like grains is more suitable for perpendicular recording films.     

Berry Phase in an Entangled Spin Cluster with Five Particles

The geometric phase, in particular the Berry phase, in an entangled state of five spin-1/2 particles is studied. A time-dependent magnetic field is applied to control the time evolution of the cluster. Using the method of algebraic dynamics, we calculate the non-adiabatic geometric phase or Berry phase and the degeneracy energy levels when the magnetic rotates around Z axis. Based on the exact analytical solutions, we show how the Berry phase of the entangled state of this cluster depends on the external magnetic field parameters w （the angular velocity of the rotating magnetic field） and θ （the angle between the magnetic field and Z axis）.