Effects of home preparation on pesticide residues in cabbage

Experiment was carried out to evaluate the pesticides (chlorpyrifos, p,p-DDT, cypermethrin, chlorothalonil) residue levels in cabbage in the process of home preparation by washing with different concentrations of acetic acid and sodium chlorine, and tap water, preserving in refrigerator, and stir-frying for different time. Results showed that washing by tap water and/or detergent solution for cooking are necessary to decrease the concentration of pesticide residues in cabbage. Washing with acetic acid solutions (at 10% concentration for 20 min) caused 79.8%, 65.8%, 74.0% and 75.0% loss of the above pesticides, respectively. Washing with NaCl solutions (at 10% concentration for 20 min) produced 67.2%, 65.0%, 73.3% and 74.1% loss, respectively, and washing by tap water (for 20 min) were 17.6%, 17.1%, 19.1% and 15.2% loss, respectively. The reductions due to the refrigeration (for 48 h) were 3.4%, 2.6%, 3.1% and 3.6%, respectively, and those due to the stir-frying (for 5 min) were 86.6%, 67.5%, 84.7% and 84.8%, respectively. The data indicated that washing by detergent solutions and stir-frying of cabbage are the most effective home preparations for the elimination of pesticide residues.     

液体酚型抗氧剂的制备及性能评定

以2，6-二叔丁基苯酚和丙烯酸酯为主要原料制备出一种液体酚型抗氧剂新产品羟基苯基丙酸酯化合物(LA0)。对制备的LAO的结构、组成及理化性能特别是抗氧化性能进行了分析评定。结果表明：LAO具有油溶性好、使用方便、特别是高温抗氧化能力强等优点，质量达到国外同类优质产品水平，并具有良好的环保性。     

Preparation of Compound Ultrafine CeO2 by Wet-Solid-Phase Mechanochemical Modification

To satisfy practical requirements from industrial applications, an alternate route for synthesis compound ultrafine CeO2 powders by wet-solid-phase mechanochemical modification using industrial grade hydrated cerium carbonate as raw material was proposed.The effect of modifier reaction percentage, reaction time, calcining temperature and modifier amount on particle size, density, suspensibility, and hardness of compound CeO2 powder was investigated.The phase evolutions of preparation process were characterized by XRD.SEM micrograph of the final product shows that compound CeO2 powders obtained are well-dispersed, spherically-shaped, uniformly-sized and submicron-sized particles.The method is readily available in raw material, low in cost, simple in process, and has great potential for industrialization.The compound CeO2 powders of different physical properties can be synthesized by controlling the above-mentioned influence factors in preparation process.     

纳米技术在中药开发中的应用

本文综述了纳米科技与中药制剂相结合的发展，阐述了纳米中药的概念、特性，介绍了纳米中药的制备技术，另外探讨了收集纳米粒子的方法，最后，着重展望了纳米技术在中药制剂中广泛的应用前景。     

纳米薄膜的分类、特性、制备方法与应用

介绍了纳米薄膜的分类以及纳米薄膜的光学、力学、电磁学与气敏特性;综述了现有的溶胶鄄凝胶法、LB鄄膜法、电化学沉积法、化学汽相沉积、低能团簇束沉积法、真空蒸发法、溅射沉积、分子与原子束外延、分子自组装等纳米薄膜制备技术;概括了纳米薄膜的应用。     

尖晶石型软磁铁氧体纳米材料的制备研究进展

介绍了软磁铁氧体纳米材料的特性,综述了近年来具有尖晶石结构的软磁铁氧体纳米材料的制备方法。其中包括:化学共沉淀法,水热法,溶胶-凝胶法,喷雾热解法,微乳液法,相转化法,超临界法,冲击波合成法,微波场下湿法合成,爆炸法,高能球磨法,自蔓延高温合成法等。详细介绍了各种制备方法的特点,研究进展及其发展趋势。     

Effect of Preparation Methods and Condition of Precursors on the Phase Composition of Yttria-Stabilized Zirconia Powders

An yttria-stabilized zirconia powder, free of monoclinic phase, may be prepared by an oxalate method in an ethanol solution at strong acidity. This study demonstrates that the control of pH in the preparation of precursors has a significant effect on the ability of precursors to crystallize and hence plays an important role in determining the formation and fraction of various crystalline phases in the resulting yttria-stabilized zirconia powder. With the increase of pH, a precursor with a certain crystalline form may be transformed into an amorphous precursor, and a monoclinic phase appers in the phase composition of the resulting powder. The results of XRD analysis and Raman spectroscopy are discussed.     

T_C≥400°C高温PTC陶瓷的研制

利用国产原料，采用传统的陶瓷材料制备工艺，研制了居里温度ＴＣ≥４００°Ｃ的高温ＰＴＣ陶瓷，制成了居里温度ＴＣ＝４１２°Ｃ，电阻Ｒ≤１０３Ω，ｌｇ（Ｒｍａｘ／Ｒｍｉｎ）＝４的高性能ＰＴＣ热敏陶瓷材料     

相转移法制备高纯超细TiO2技术研究

报道了用相转移法制备高纯超细ＴｉＯ２的新技术；探讨了Ｔｉ（Ⅳ）从有机相转移到水相发生水解反应的机理 ；通过ＴＧ－ＤＴＡ分析以及ＸＲＤ物相分析对水解产物的组成、热分解机理，晶型转变规律进行了研究，建立了水解产物焙烧的最佳温度。     

鱼类耳石扫描电镜样品制备与观察

本文介绍了一种鱼类耳石样品的扫描电镜制样方法，通过对草鱼耳石进行包埋，抛磨，并用合适的腐蚀剂处理，用ＳＥＭ成功地观察了耳石的日轮及超微结构，该方法简便易行，保证所观察耳石样品的微观结构完整与清晰。