New progress in zeolite synthesis and catalysis

The rational design synthesis of zeolite catalysts with effective, environmentally benign and atom-economic routes is a major topic in the field of microporous materials, as it would avoid the high labor cost and inefficiency of traditional trial-and-error methods in developing new structures and dispel environmental concerns regarding the industrial mass production of zeolites. Catalytic applications of zeolite materials have expanded from conventional single functionalities, such as solid acids or selective oxidation catalysts to bi/multifunctionalities through combination with metals or metal oxides. This is a response to new requirements from petrochemical and fine chemical industries, such as precise control of product distribution, conversion of low-carbon resources for chemical production, and solutions to increasingly severe environmental problems related to CO₂ and NO_x. Thus, based on the systematic knowledge of zeolite chemistry and science that researchers have acquired in the past half-century and the development requirements, remarkable progress has been made in zeolite synthesis and catalysis in the past 10 years. This includes the manipulation of zeolitic monolayers derived from layered zeolites and germanosilicates to construct novel zeolite materials and effective and green zeolite syntheses as well as the synergistic interaction of zeolites and metal/metal oxides with different space distributions in the conversion of low-carbon resources. With many zeolite catalysts and catalytic processes being developed, our understanding of the close relationship between zeolite synthesis, structure and catalytic properties has deepened. Researchers are gradually approaching the goal of rationally designing zeolite catalysts with precisely controlled activity and selectivity for particular applications.     

混合烯烃催化加氢工艺条件的探讨

报道了利用C_20~+混合烯烃为原料,雷尼镍作催化剂的加氢反应工艺条件的研究结果。当催化剂用量为原料的10%时,实验结果表明,适宜的工艺条件为:以无水乙醇为溶剂,加氢压力4.0Mpa,反应温度100℃,反应时间5h,所得产物收率可达85.1%。经IR分析为目标产物,且已达到精制石蜡的标准。     

Recognition of Values-Based Constructs in a Summer Physical Activity Program

The purpose of this study was to examine the extent participants in a summer sports camp embraced values-based constructs and to examine the relationship between perceptions of values-based constructs and affect and attitude. Participants included 135 ethnically diverse boys and girls (mean age 11.98 years) attending the National Youth Sport Program (NYSP). Participants' perceptions of the extent the program emphasized values-based constructs and participants' enjoyment, interest in sport, future expectations, and respect of leadership were assessed. Factor analysis revealed three values-based constructs: Care for Others/Goal Setting, Self-Responsibility, and Self-Control/Respect. Correlational analyses revealed that emphasizing values-based criteria was positively related to the participant's sport enjoyment, interest in sport, positive future expectations, and greater respect for leaders. The practical implications of the findings are discussed.     

一种新的学习隐喻:拓展性学习的研究——基于“文化-历史”活动理论视角

拓展性学习(Expansive Learning)作为一种新的学习隐喻,最初是由芬兰学者Engestrm提出,是文化-历史活动理论在实践中的成功应用。通过对拓展性学习的产生、发展、本质内涵、理论根源及核心思想进行分析,为探讨当代学习理论的发展增添了一个新视角。     

从学生活动看大学精神内涵发展现状——基于上海四所本科院校媒体报道的分析

大学精神是校园文化的核心,校园文化与学生活动相互影响,从而使学生活动成为大学精神的直观映照。通过社会媒体对4所高校相关学生活动的报道情况显示,当前高校在人文精神与科学精神、独立精神与自由精神方面发展良好,创新精神有余但批判精神不足,同时理科类高校在时代精神上表现突出。     

Chemical composition and antibacterial activity of <Emphasis Type="Italic">Gongronema latifolium</Emphasis>

Chemical composition of Gongronema latifolium leaves was determined using standard methods. Aqueous and methanol G. latifolium extracts were tested against thirteen pathogenic bacterial isolates. Crude protein, lipid extract, ash, crude fibre and nitrogen flee extractives obtained are： 27.2%, 6.07%, 11.6%, 10.8% and 44.3% dry matter respectively. Potassium, sodium, calcium, phosphorus and cobalt contents are 332, 110, 115, 125 and 116 mg/kg respectively. Dominant essential amino acids are leucine, valine and phenylalanine. Aspartic acid, glutamic acid and glycine are 13.8%, 11,9% and 10.3% respectively of total amino acid. Saturated and unsaturated fatty acids are 50.2% and 39.4% of the oil respectively. Palmitic acid makes up 36% of the total fatty acid. Extracts show no activity against E. faecalis, Y. enterolytica, E. aerogenes, B. cereus and E. agglomerans. Methanol extracts were active against S, enteritidis, S. cholerasius ser typhimurium and P. aeruginosa （minimum inhibitory concentration （MIC） 1 mg; zone of growth inhibition 7, 6.5 and 7 mm respectively）. Aqueous extracts show activity against E. coli （MIC 5 mg） and P. aeruginosa （MIC 1 mg） while methanol extracts are active against P. aeruginosa and L. monocytogenes. G. lafifolium has potential food and antibacterial uses.     

略论刘禹锡的经济生产民俗诗

刘禹锡被贬谪放逐远州23年,创作了许多经济生产民俗诗歌,内容新奇,形式多样,比较客观地反映了中唐时期朗州、连州、夔州三地各族人民的生活生产习俗,具有很高的民俗学研究价值。     

贫困农村儿童课外信息获得现状及特点分析——以湖南省永州市为例

在新的历史条件下，贫困农村地区的社会生活方式和文化大环境慢慢在改变，农村小学生课外获取信息的途径、数量、内容也发生了较大变化。从调查结果看，永州市贫困农村小学生课外信息获得的特点有：态度和信息数量上分别具有“遵守与背离”、“需求量大与资源有限”的矛盾；内容和信息使用上则分别具有“功利性与盲目性”、“放任性与闭锁性”的特征。     

表面活性剂增敏催化光度法测定痕量亚硝酸根

基于在稀硫酸介质中溴代十六烷基吡啶 (CPB)对亚硝酸根 (NO-2 )催化溴酸钾氧化碘曙红褪色反应的增敏作用 ,建立了测定NO-2 的表面活性剂增敏催化动力学光度法 .由于加入增敏剂 ,灵敏度显著提同 .lgA0 /A值与NO-2 含量在 0～ 1.0 μg/mL范围内存在线性关系 ,检出限量为0 .0 6 μg/ml.方法用于水样、蔬菜中痕量亚硝酸根的测定 ,结果较好