Characterization of Super‐Absorbent Material Based on Carboxymethylcellulose Sodium Salt Prepared by Electron Beam Irradiation

Crosslinked CMC‐N/PAAm hydrogel were prepared using electron beam irradiation. The factors affecting the degree of crosslinking and swelling behavior of the prepared copolymer were determined. As the irradiation dose and/or PAAm concentration increase, the gel content increases. Preparation of super‐porous hydrogel was attained by the addition of ammonium carbonate as a gas‐blowing agent during the irradiation process. The surface morphology and pore structure of such a prepared hydrogel were examined using scanning electron microscopy. The ability of the prepared hydrogel to absorb and retain large amount of water and as simulating urine was measured. The results suggested the possible use of CMC‐Na/PAAm hydrogels in the personal care product industry.     

Graft Copolymerization of Artemisia Seed Gum with Acrylic Acid under Microwave and its Water Absorbency

A super‐absorbent polymer was prepared by grafting copolymerization of acrylic acid onto Artemisia seed gum, using microwave irradiation and ammonium persulfate as an initiator. The effect of various preparation conditions on its water absorbency, such as the ratio of acrylic acid to Artemisia seed gum, degree of acrylic acid neutralization, amount of initiator and microwave irradiation time, was investigated by orthogonal tests. The optimal reaction conditions were 3 min (irradiation time), 70% neutralization degree of acrylic acid and 2% initiator on the basis of the mass of acrylic acid used. When the mass ratio of acrylic acid to Artemisia seed gum is 5:0.5, the product has a water absorbency close to 400 times at room temperature in distilled water, this indicated that is has a high water absorbency. The structure of the graft copolymer was confirmed by Fourier transform infrared spectrometer (FT‐IR) and thermogravimetric analysis (TGA). Further more, this microwave irradiation processing method to prepare water absorbent materials has no industrial cast off produced, that is to say, this method is environmentally friendly.     

Liquid-Crystalline Polyurethanes. 5. Polyurethanes Containing the Cholesterol Moiety in the Side Chain

In the preceding papers of this series, we reported the synthesis of liquid-crystalline polyurethanes containing mesomorphic moieties in the main chain and in side chains [1–4]. Liquid crystalline polymers with side groups containing the cholesterol moiety have also been studied [5, 6]. The main focus of attention has centered around the study of phase transitions of acrylic and methacrylic derivatives of cholesterol. This paper describes the synthesis of a new type of liquid-crystalline polyurethane containing the cholesterol moiety in side chains.     

HPLC法拆分高效盖草能乳油中吡氟氯禾灵的光学异构体

建立了高效盖草能乳油中有效成分精吡氟氯禾灵的快速、准确的高效液相色谱分析方法;在流动相为正已烷-异丙醇（体积比70：30）,流速1.0mL/min,检测波长为280nm,柱温为25℃时,高效盖草能乳油中吡氟氯禾灵的光学异构体在Chiralcel OK柱得到很好分离;方法的标准偏差和相对标准偏差分别为0.46g/L和0.43%     

用于眼检的光学相干层析成像技术研究

利用光学相干层析（OCT-Optical Coherent Tomography）技术可以透过低透明介质,特别是生物组织成像,介绍了基于1310nm波长稳定光源的OCT实验装置,实验装置采用SLD超辐射二极管光源,利用该装置对番茄皮进行了实际OCT图样采集,研制成的实验系统具有10μm左右的纵向分辨率,最后对进一步提高眼检OCT系统的性能进行了研究。     

微波法合成淀粉接枝丙烯酸盐类高吸水性树脂的研究

以N,N′-亚甲基双丙烯酰胺为交联剂、过硫酸铵为引发剂、在微波辐照下对淀粉接枝丙烯酸盐共聚进行了系统的研究,确定了最佳的反应条件,合成了粉末状的高吸水性树脂。并用FTIR和固体NMR等方法探讨了淀粉一丙烯酸盐接枝共聚物的结构特征。实验结果表明,利用微波技术合成淀粉一丙烯酸盐接枝共聚物可实现一次合成、干燥,简化合成工艺。淀粉与丙烯酸盐质量比为40／100左右时产物的接枝率最大,且吸水速率明显高于化学法合成的高吸水树脂。     

Super energy flows in a waveguide filled with air and left-handed materials

The phenomena of super energy flows are studied theoretically and numerically in a parallel-plate waveguide which is filled with two layered equally-thick different media, i.e. air and specific left-handed materials (LHM) with $\epsilon_{{\rm r}1}=-1/(1+\delta)+\i\gamma$ and $\mu_{{\rm r}1}=-(1+\delta)+\i\gamma$. In this special waveguide, two-directional super-energy flows are excited by a three-dimensional horizontal electric dipole at the same time, which has transmission patterns different from those of two-dimensional source and three-dimensional vertical electric dipole. We also show that the retardation and loss in LHM are sensitive to the amplitude of super power densities, and the dimensions of waveguide determine the propagating modes, which makes super energy flows more practical.     

Design of new neutral organic super‐electron donors: a theoretical study

For the purpose of designing new functional super‐electron donors (SEDs), the structure and stability of analogous tetrathiafulvalene (TTF) compounds are investigated and compared with those of the parent TTF by quantum chemistry calculations. Density functional theory (DFT) method B3LYP in combination with the polarized continuum model (PCM) is employed to compute the standard redox potentials ( ) of about 80 neutral organic SEDs in acetonitrile. Theoretical models are evaluated through correlation with 40 available experimental data. Excellent agreement between the theoretical predictions and experimental data is found with a mean absolute deviation of 0.08 V. Furthermore, we designed new species related to tetraazafulvalene (TAF) and evaluated their redox potential in search of new SEDs. Copyright © 2009 John Wiley & Sons, Ltd.     

基于GoogLeNet和空间谱变换的高光谱图像超分辨率方法

为了提高高光谱图像的空间分辨率,提出了一种基于GoogLeNet和空间谱变换的高光谱图像超分辨率(SR)方法.设计出遥感图像的光谱SR框架,对图像中不同反射光谱进行提取;采用GoogLeNet的稀疏编码对粗像素光谱进行放大,并投影到高分辨率字典上,将潜在SR表示进行反转,以获得超分辨光谱;为了提高图像重构的保真度,利用...