不同半光强角对医用LED阵列灯珠间距影响的仿真研究

 讨论LED光源的半光强角对LED之间的最大间距的影响,采用Matlab软件对LED单元照度数据进行计算及仿真,给出相应的仿真图形。仿真结果表明:LED光源之间的最大间距与其功率无关,由于仿真的结果与理论计算值相吻合,说明在计算中所建立的LED的光学模型具有较高的可信度,所得结果为LED多阵列（如圆形,矩形,椭圆等）的仿真及应用设计奠定了理论基础。     

Influencing factors of microscanning performance based on flat optical component

To decrease the performance difference between the actual microscanning thermal imager and the theoretical value, a germanium lens (placed at a certain angle between the infrared focal plane array and infrared lens) dip angle model of flat optical component microscanning is introduced in this letter. The model is the basis for choosing the dip angle of the germanium lens, which is used in the microscanning thermal imager. In addition, the actual dip angle of the germanium lens is chosen according to the model, the infrared lens parameters of the thermal imager, and the germanium lens parameters of manufacture and installation. Only in this manner can the optimal performance of the microscanning thermal imager based on the flat optical component be obtained. Results of the experiments confirm the accuracy of the conclusions above.     

壁面条件对熄火特性影响的实验研究

利用多孔狭缝喷嘴考察了不同壁面条件对平行平板间甲烷/空气预混火焰熄火的影响规律,并采用表面分析手段探讨了不同材料对熄火特性的影响因素.实验结果表明壁面温度和表面特性都会影响熄火特性,熄火间距随着壁面温度的升高而单调减小,材料不同时熄火间距的差别在低温和高温时较小,在壁温为400℃时最大.化学熄火效应与表面化学吸附的OH...     

Study of the THGEM detector with a reflective CsI photocathode

The THGEM detector without and with a CsI has been tested successfully. The optimal parameters of THGEM have been determined from eight samples. The UV photoelectric effect of the CsI photocathode is observed. The changing tendency related to the extraction efficiency (ε_extr) versus the extraction electric field is measured, and several electric fields influencing the anode current are adjusted to adapt to the THGEM detector with a reflective CsI photocathode.     

一类矩阵方程的Hermitian R-对称定秩解

本文研究了矩阵方程AX = B 的Hermitian R-对称最大秩和最小秩解问题. 利用矩阵秩的方法, 获得了矩阵方程AX = B有最大秩和最小秩解的充分必要条件以及解的表达式, 同时对于最小秩解的解集合, 得到了最佳逼近解.     

一个推广的Hilbert型积分不等式

引入Γ-函数和ζ-函数,利用权函数方法和实分析技巧,建立一个推广的Hilbert型积分不等式.考虑了它的等价式,证明了它们的常数因子是最佳的,并通过取特殊的参数值,得到一些有意义的结果.     

Dunkl’s theory and best approximation by entire functions of exponential type in L 2-metric with power weight

In this paper, we study the sharp Jackson inequality for the best approximation of f ∈L2,κ(Rd) by a subspace E2κ(σ)(SE2κ(σ)), which is a subspace of entire functions of exponential type(spherical exponential type) at most σ. Here L2,κ(Rd) denotes the space of all d-variate functions f endowed with the L2-norm with the weight v2κ(x) =ξ∈R, which is defined by a positive+|(ξ, x)|κ(ξ)subsystem R+ of a finite root system RRdand a function κ(ξ) : R → R+ invariant under the reflection group G(R) generated by R. In the case G(R) = Zd2, we get some exact results. Moreover,the deviation of best approximation by the subspace E2κ(σ)(SE2κ(σ)) of some class of the smooth functions in the space L2,κ(Rd) is obtained.     

矢量和函数逼近

将矢量与有限幂函数作平行比较,可以看出采用函数基线性逼近函数与用单位矢表示任意矢量在本质上是相同的,具体实例表明了这一点,且与Remez最佳一致逼近作出对比.本文是在学习李政道博士教学思想基础上,所作的工程数学教学实践尝试之一.