5—25keV刻度用X射线发生器

利用轫致辐射激发原子产生X射线荧光,经吸收边过滤,研制成单色低中能X射线发生器。实验给出5—25keV能区的4个单能点的强度、纯度以及相应的剂量率,可供刻度使用。     

400W行波热声发电系统的实验研究

本文阐述了为太阳能发电系统设计的400 W行波热声发电系统(TWTAEG)的实验研究过程.实验系统由行波热声发动机和直线发电机组成,系统采用平均压力为3.5 MPa的氦-氩混合气体为工质,其中氩气分压比为1.4%,系统运行频率为74Hz.实验中最大输出电功为446 W,此时的热电效率为13%;在输出电功为416 W时热...     

Singularly perturbed nonlinear second order elliptic equation

In this paper, we study singular perturbation problems of some semi-linear second order elliptic equations with nonlinear boundary value conditions: where ε is a small positive parameter and u/ l is a directional derivative, which lies on an oblique vector (x,ε). We have given a construction of the asymptotic solutions and proof of their asymptotic correctness, which is based on the principle of contraction mapping.     

Probability theory and polymer physics

This study applies the theory of stochastic processes to the equilibrium statistical physics of polymers in solution. The topics treated include random copolymers and randomly branching polymers, with self-consistent mean field effects. A new and more natural way of dealing with Boltzmann weighting is discussed, which makes it possible from the beginning of a calculation to consider only the physical polymer conformations. We also show that in general the random copolymer problem can be reduced to the ordinary polymer problem, and treat the self-consistent field problem for a general branching polymer.     

一族Liouville可积的有限维Hamilton系统

本文生成了一族Liouville可积的Hamilton相流彼此可交换的有限维Hamilton系统,并且给出了一串对合的显式公共运动积分及其一组对合的显式生成元.     

间接馈电的磁通量压缩发生器的参数选择

 从电路方程出发较详细地分析了间接馈电的磁通量压缩发生器的工作原理。分析表明：在设计间接馈电的磁通量压缩发生器时，只有馈电回路的电感L₁和电容C₀满足(L₁C₀)^1/2>>T时，MFCG才有效运行；耦合形式的MFCG能使初始磁通量放大；馈电回路电容大小的选择将影响MFCG输出的电流脉冲形状。这些结论对于设计磁通量压缩发生器具有指导意义。     

Collective modes in the generator coordinate method

Using the harmonic version of the generator coordinate method, and Skyrme interaction, the frequencies of the isoscalar breathing and quadrupole modes are related to the relevant incompressibility coefficients. The possibility of extending this to spin modes is also examined. It is found that a spin incompressibility coefficient is negative for a particular set of Skyrme parameter for⁴He. Other sets produce low positive values and these in turn could imply a relatively low lyingS=2,T=1 state. The replacement of the three-body term by the density-dependent one, suggested by Chang provides a cure for this pathology.     

一种生成对称群S9所有Sylow-p子群的算法

根据对称群的基本性质以及第二同构定理，给出了通过添加生成元到P群来构造对称群的一个Sylow-p子群的定理，添加的生成元保证能够快速得到对称群的一个Sylow—p子群．根据第二西洛定理求出了所有共轭子群，即所有Sylow-p子群．针对求所有共轭子群过程中面临共轭子群出现重复的问题，利用正规化子的性质，找到使得两个Sylow-p子群共轭的元，保证每次求的Sylow-P子群不重复．将此算法应用于S1，实验表明该算法可操作性强，耗费时间少．     

定速风力发电机模型参考自适应控制

在对定速风力发电机建模的基础上,设计了模型参考自适应控制器,并进行了跟随性能和抗干扰性能仿真,仿真结果表明自适应控制器的自适应能力很好.     

离子色谱电导检测法测定酒中的有机酸和无机阴离子

采用淋洗液发生器-抑制电导检测法,同时分离和检测16种无机阴离子和低分子量有机酸,建立了用亲水性阴离子交换分离柱,KOH为淋洗液等浓度泵作梯度淋洗的离子色谱分离方法. 该方法具有良好的重现性、线性关系. 除马来酸外,所有被测离子的检测限都在0.16 mg/L以下. 方法用于测定4种酒样品的分析,结果满意.样品测定的回收率在93.52%到116.08%之间,除富马酸外其它RSD都小于3.8%.