圆周上的贝塞尔级数的等价收敛定理

定义了单位圆周上的贝塞尔级数；给出其核函数的渐近表示；讨论与其相应的幂级数间的等价收敛定理及其应用。     

混合型Jacobi级数的［F，d_n］平均的点态逼近

用混合型Ｊａｃｏｂｉ级数的部分和的［Ｆ，ｄｎ］平均逼近ｌｉｐａ类函数，给出了相应的点态估计．     

Hermite插值的平均收敛的Erdos—Feldheim型定理

讨论了基于扩充的第二类切比雪夫节点的Ｈｅｒｍｉｔｅ插值的平均收敛的Ｅｒｄｏｓ－Ｆｅｌｄｈｅｉｍ型定理。     

Bessel级数在边界解析点处的性态

给出圆域中贝塞尔级数的部分和偏差的一个新的表达式，进而讨论了贝塞尔级数在边界解析点处的性态。     

圆周上连续函数的新逼近工具

为单位圆周上的连续函数的逼近提供了新的工具．     

混合型Jacobi级数的[F,dn]平均的点态逼近

用混合型Ｊａｃｏｂｉ级数的部分和的［Ｆ，ｄｎ］平均逼近ｌｉｐａ类函数，给出了相应的眯态估计。     

有界变差函数的混合型Fourier-Jacobi级数的收敛速度

对子在[-1,1]上的有界交差函数,估计了用它的混合型富里埃一雅可比级数的部分和逼近的偏差.     

Hermite插值的平均收敛的Erdos─Feldheim型定理

讨论了基于扩充的第二类切比雪夫节点的Ｈｅｒｍｉｔｅ插值的平均收敛的Ｅｒｄｏｓ—Ｆｅｌｄｈｅｉｍ型定理     

Kaolin-based geopolymers with various NaOH concentrations

Kaolin geopolymers were produced by the alkali-activation of kaolin with an activator solution (a mixture of NaOH and sodium silicate solutions). The NaOH solution was prepared at a concentration of 6–14 mol/L and was mixed with the sodium silicate solution at a Na₂SiO₃/NaOH mass ratio of 0.24 to prepare an activator solution. The kaolin-to-activator solution mass ratio used was 0.80. This paper aimed to analyze the effect of NaOH concentration on the compressive strength of kaolin geopolymers at 80℃ for 1, 2, and 3 d. Kaolin geopolymers were stable in water, and strength results showed that the kaolin binder had adequate compressive strength with 12 mol/L of NaOH concentration. When the NaOH concentration increased, the SiO₂/Na₂O decreased. The increased Na₂O content enhanced the dissolution of kaolin as shown in X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses. However, excess in this content was not beneficial for the strength development of kaolin geopolymers. In addition, there was the formation of more geopolymeric gel in 12 mol/L samples. The XRD pattern of the samples showed a higher amorphous content and a more geopolymer bonding existed as proved by FTIR analysis.