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61.
我国大学毕业生就业形势日趋严峻,就业问题已经引起了社会的广泛关注,社会各界都在为大学生就业出主意、想办法.笔者对目前毕业生就业中的几对矛盾及其化解作了一些探索,本文就如何解决这些矛盾谈一点看法. 相似文献
62.
通过正交实验确定了利用原子吸收分光光度法测定锰的最佳测试条件,并测定了生产金刚石电解触媒废液沉渣中的锰含量,实验准确度和精密度较高,适合工业快速分析. 相似文献
63.
种子法制备聚合物乳液技术的进展 总被引:2,自引:0,他引:2
从建筑乳液的生产现状、自生种子法与外加种子法的区别、种子乳液的特点及外加种子法生产的乳液特性等方面介绍了种子法制备乳液技术的进展。 相似文献
64.
苦参生物碱杀虫生物活性测定 总被引:30,自引:2,他引:30
以桃蚜等9种试虫为供试靶标,研究了苦参根提取物和苦参碱、氧化苦参碱、槐果碱、野靛碱的杀虫活性。试验结果表明:苦参生物碱具有一定的杀虫活性,9种试虫中,苦参根提取物对蚜虫的活性最高,其对蚕豆蚜的LC50为20.635mg/L;即使在最高剂量为4000mg/L时,也不能直接杀死粘虫、小菜蛾和棉铃虫。4种生物碱对朱砂叶螨活性均较低,LC50均大于2500mg/L。野靛碱是4种生物碱中杀虫活性最高的,对淡色库蚊、桃蚜、蚕豆蚜、褐飞虱和家蝇的LC50分别为172.431mg/L、207.667mg/L、85.212mg/L、266.179mg/L和763.224mg/L;而且对褐飞虱、桃蚜和家蝇的活性高于苦参根提取物,苦参碱对蚜虫的活性高于氧化苦参碱和槐果碱,槐果碱对淡色库蚊、褐飞虱和家蝇的活性高于苦参碱和氧化苦参碱。 相似文献
65.
ABSTRACT In this research, the effect of particle size on the surface oxidation and flotation behavior of galena in the lime system was studied. Coarse (?0.074 + 0.038 mm), intermediate (?0.038 + 0.025 mm) and fine (?0.025 mm) galena particles were used in the experiment. The dissolution tests, flotation tests, and sorption tests were accomplished. Through further analysis by XPS, the effect of particle size and lime was observed. The decrease of mineral particle sizes increased the adsorption ratio of collector and the dissolution of galena, while the hydrophilic product OH?/Ca(OH)+ produced by dissolution occupied the dominant position, which led to the minerals hydrophilic. 相似文献
66.
Yun-fei Liu Yi-nong Lu Ming Xu Liu-fei Zhoun 《Journal of the American Ceramic Society》2007,90(6):1774-1779
The molten salt synthesis (MSS) method is utilized to synthesize the anisotropic platelet Sr3 Ti2 O7 (S3T2) single-crystal particles. The aim of this study is to identify the essence of platelet Sr3 Ti2 O7 crystal growth and guide the synthesis of anisotropic platelet SrTiO3 crystals as well as various technologically important materials. Based on the results of X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy, the formation mechanism of platelet Sr3 Ti2 O7 crystals conforms to a nucleation–structure rearrangement–dissolution–diffusion in situ epitaxial growth mechanism model. First, SrCO3 reacts with TiO2 to form submicrometer SrTiO3 nuclei. Then, most of the nuclei surrounded by salt ions aggregate and rearrange to form a large SrTiO3 matrix. The structural rearrangement and the subsequent in situ epitaxial growth processes control the morphology, composition, and size of the final Sr3 Ti2 O7 crystals. In the synthesis process, the conversion between SrTiO3 and Sr3 Ti2 O7 is as follows: and the crystallographic orientation relationship between Sr3 Ti2 O7 and SrTiO3 in the interface is (100)S3T2 //{100}ST , (010)S3T2 //{010}ST , and (001)S3T2 //{001}ST . 相似文献
67.
68.
山梨醇类聚丙烯成核剂的开发与应用研究进展 总被引:7,自引:1,他引:7
综述了山梨醇类聚丙烯成核剂产品在国内外的开发进展,介绍了该类成核剂在聚丙烯中的应用和效果,及其作用机理。 相似文献
69.
Yi Zhang Bin Li Pinggen Rao Ming Lü Jianqing Wu 《Journal of the American Ceramic Society》2007,90(5):1615-1618
The leucite crystallization kinetics from a hydrothermally derived precursor seeded with nano-crystalline leucite was investigated by X-ray diffraction and non-isothermal differential thermal analysis. The nano-crystalline leucite was prepared by high-energy milling of high-purity leucite powder and the leucite precursor was prepared by the hydrothermal method of silica sol, aluminum nitrate, and potassium nitrate. After the seeds were introduced, the crystallization temperature of the precursor was lowered by 100°C and the transition phase kalsilite did not appear during the crystallization process. When the seeded precursor was heat treated at 700°C, a small amount of cubic leucite was stabilized to room temperature. The seeded precursor showed an exothermic peak between 800° and 920°C under different heating rates. The activation energy for the growth of leucite from the seeded precursor was 256(SD9) kJ/mol. 相似文献
70.
Polyaniline emeraldine base/epoxy resin (EB/ER) coating was investigated for corrosion protection of mild steel coupled with copper in 3.5% NaCl solution. EB/ER coating with 5-10 wt% EB had long-term corrosion resistance on both uncoupled steel and copper due to the passivation effect of EB on the metal surfaces. During the 150 immersion days, the impedance at 0.1 Hz for the coating increased in the first 1-40 days and subsequently remained constant above 109 Ω cm2, whereas that for pure ER coating fell below 106 Ω cm2 after only 30 or 40 days. Immersion tests on coated steel-copper galvanic couple showed that EB/ER coating offered 100 times more protection than ER coating against steel dissolution and coating delamination on copper, which was mainly attributed to the passive metal oxide films formed by EB blocking both the anodic and cathodic reactions. Salt spray tests showed that 100 μm EB/ER coating protected steel-copper couple for at least 2000 h. 相似文献