Synthesis and characterization of aromatic polyamides containing alkylphthalimido pendent groups

A series of polyisophthalamides containing pendent phthalimido groups and flexible side spacers were prepared from four novel diacids and three commercial aromatic diamines. These polyamides were prepared in high yields and with high molecular weights by direct polycondensation with triphenyl phosphite and pyridine as condensing agents. The weight‐average and number‐average molecular weights, measured by gel permeation chromatography, were 70,000–137,000 and 47,000–86,000 g/mol, respectively. The novel polyamides were amorphous and readily soluble and showed glass‐transition temperatures of 150–240 °C, as measured by differential scanning calorimetry. Thermogravimetric analysis showed that the 10% weight‐loss temperatures in nitrogen were 355–430 °C, a significant improvement in thermal stability having been observed with the increase in the side‐chain length. A theoretical quantum mechanical study was successfully carried out to explain these results. Flexible and tough films, cast from polymer solutions, showed tensile strengths of 50–125 MPa. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 3711–3724, 2002     

庐山儿童发中微量元素与生长发育关系的调查

调查分析了庐山５０８名１－７岁儿童发中锌，铁，铜含量，并对其与儿童生长发育的关系进行了探讨。结果表明，微量元素与生长发育密切相关。     

治疗小儿厌食症中药强壮灵冲剂微量元素测定及其与疗效关系探讨

已证明小儿厌食症除与缺乏微量元素锌关系密切外,还与其他多种微量元素和宏量元素的缺乏或低下也有关。本院以自行研制的中药强壮灵冲剂治疗小儿厌食症疗效显著。其于浸膏粉经２０余种微量元素测定表明含有锌、铁、钴、铜、镍、锰、铬、锗、锶、铝、钡、硒、硅、钛等多种人体必需且品种齐全,含量适度的微量元素。上述元素又恰是患儿体内所缺乏和低下的品种,无疑对患儿全面适度的补充大有裨益．中药强壮灵与西药硫酸锌临床对比研究表明,无论比发锌回升数值以及从厌食等全面疗效统计,中药组均明显优于西药组,并且发现疗效与药物的补锌量不成正相关。说明中药的调理脾胃功能及综合整体治疗作用是其突出优点,值得推广．     

Analysis of basic hair dyes by HPLC with on-line post-column photochemical derivatisation

Summary A reversed phase liquid chromatographic method is proposed for the analysis of basic hair dyes (raw materials and colourant formulations). The performance of the method was enhanced by introducing post-column on-line photochemical derivatisation in combination with a Diode Array Detector. On-line photoderivatisation provided an effective way of selectively transforming the analytes to compounds with different spectral properties. For each analyte two characteristic UV-Visible spectra (photoreactor on and off) were obtained with the same mobile phase and this information in combination with the chromatographic data (k' at pH 3.0 and 4.5) enabled the unambiguous identification of both commonly used, approved, and banned basic hair dyes. Additionally, this approach was found useful to improve the method sensitivity, allowing the determination of analytes present in low concentration (0.03%) in complex commercial formulations.This work constitutes part of the thesis for the Dottorato di Ricerche of Roberto Gotti.     

New formulation of restricted growth processes

We present a new formulation of a class of growth models-those which evolve according to an exclusion process. This formulation is based upon a transformation of the probability distribution function which involves Grassmann variables. This method is very general and enables one to derive an exact stochastic differential equation for the model of interest. We describe this method using the traffic model as an example.     

Droplet dynamics for asymmetric Ising model

Nucleation from a metastable state is studied for an anisotropic Ising model at very low temperatures. It turns out that the critical nucleus as well as configurations on a typical path to it differ from the Wulff shape of an equilibrium droplet.     

KZnF3：Eu^3＋单晶生长及光谱特性

利用Ｂｒｉｄｇｍａｎ－Ｓｔｏｃｋｂａｒｇｅｒ方法在氩气气氛下生长出ＫＺｎＦ３：Ｅｕ＾３＋单晶，测定了晶体的激发光谱、荧光发射光谱和ＥＳＲ谱，讨论了Ｅｕ离子的取代格位。     

Application of laser ablation–inductively coupled plasma-mass spectrometry (LA–ICP–MS) to investigate trace metal spatial distributions in human tooth enamel and dentine growth layers and pulp

Human tooth enamel provides a nearly permanent and chronological record of an individuals nutritional status and anthropogenic trace metal exposure during development; it might thus provide an excellent bio archive. We investigated the micro-spatial distribution of trace metals (Cu, Fe, Mg, Sr, Pb, and Zn) in 196×339 m² raster pattern areas (6.6×10⁴ m²) in a deciduous tooth using laser ablation-inductively coupled plasma-mass spectrometry (LA–ICP–MS). Ablated areas include prenatal and postnatal enamel, the neonatal line, the dentine–enamel junction (DEJ), dentine, and the dentine–pulp junction. Topographic variations in the surface elemental distribution of lead, zinc, strontium, and iron intensities in a deciduous tooth revealed heterogeneous distribution within and among regions. ⁴³Ca normalized elemental intensities showed the following order: Sr>Mg>>Zn>Pb>Fe>Cu. Elevated zinc and lead levels were present in the dental pulp region and at the neonatal line. This study demonstrates the ability of LA–ICP–MS to provide unique elemental distribution information in micro spatial areas of dental hard tissues. Elemental distribution plots could be useful in decoding nutrition and pollution information embedded in their bio apatite structure.Presented in part at the 2002 Winter Conference on Plasma Spectrochemistry, Scottsdale, AZ, January 6–12, 2002. The poster was selected as an outstanding poster presentation.     

海口市正常儿童头发中四种微量元素含量

用电感耦合等离子体发射光谱法（ＩＣＰ－ＡＥＳ），测定了海口市２６６例正常儿童头发中锌、铁、阵、铜四种微量元素的含量，计算出海口市儿童四各微量元素的正常范围。并与其它地区文献报道值进行了比较。     

Dislocation Analysis for Large-sized Sapphire Single Crystal Grown by SAPMAC Method

In this paper,large-sized sapphire (230×210 mm,27.5 kg) was grown by SAPMAC method (sapphire growth technique with micro-pulling and shoulder-expanding at the cooled center). Dislocation peculiarity in large sapphire boule (0001) basal plane was investigated by chemical etching,scanning electron microscopy and X-ray topography method. The triangular dislocation etch pit measured is 7.6×101～8.0×102 cm-2,in which relative high-density dislocations were generated at both initial and final stages of crystal growth. The analysis of single-crystal X-ray topography shows that there are no apparent sub-grain boundaries; the dislocation lines are isolated and straight. Finally,the origins of low-density dislocation in sapphire crystal are discussed by numerical analysis method.