新型高效无害化农药防治白菜蚜虫的药效试验初报

选择新型高效无害化的生物制剂为主 ,通过复配的杀虫剂对白菜蚜虫进行药效试验 ,结果表明 ,生物制剂完全能替代常用的氨基甲酸酯类农药和有机磷农药 ,且效果较好。     

食品中防腐剂测定方法的研究

研究了紫外分光光度法测定食品中防腐剂(苯甲酸)的含量。样品中苯甲酸的最小检出量为0．0010mg/ml，回收率为98％。该方法简便易行，灵敏准确。     

溶剂胶束作用对葡萄糖氧化酶催化活性的影响

研究6种溶剂和表面活性剂对葡萄糖氧化酶催化活性的影响.研究表明,30%丙酮溶液对反应体系有激活作用,可使葡萄糖氧化酶测定葡萄糖的反应速率加快、灵敏度提高,线性范围达到0.00-10.00g/L,同时确定了最佳反应条件.研究结果对于优选新的激活剂具有一定的实际意义.     

机械力活化固相化学反应法制备CeXZr1_xO2纳米复合氧化物

Nanometer cerium-zirconium oxide solution Ce1-x ZrxO2 was synthesized by mechanically activated solid state re-action at middle-low temperatures, with Ce2(CO3)3, ZrOC12-8H2O and H2C2O4.2H2O as raw materials. The crystal structureand microstructure of the nanometer Ce1-xZrxO2 were studied with X-ray diffractometry (XRD) and transmission electronmicroscope (TEM). The results show that the product is single-cubic-phase solid solution with an average crystal size 19.64nm. In this article, the influence of surface active agent is also evaluated. Mechanically activated solid state reaction for thepreparation of Ce1-xZrxO2 is a new technique of green chemistry without solvent and waste.     

茶叶提取物与甲醛的反应检测

甲醛是室内装修材料中重要的污染源．为了有效控制甲醛的释放,对茶叶有效成分进行提取,所得提取物配成除醛剂,可以用于去除甲醛．选择加液量、反应温度和反应时间为提取因素,采用正交实验方法得到最佳提取工艺,所得产品对甲醛去除率可以达到61．77％．为了能够充分提取茶叶有效成分,还对茶叶进行多次提取,发现多次提取物除醛效果明显下降．3次后提取物几乎不再有除醛效果．     

Fenton法在垃圾渗滤液预处理中的研究

Fenton试剂采用FeSO4·7H2O固体与H2O2(30%)溶液配制.研究结果表明:在pH=3.0、Fenton试剂中H2O2与Fe2的摩尔比为10:1、H2O2的投加量为0.25 mol/L、反应时间为1.5 h时,垃圾渗滤液的CODCr去除率最高,可达64.7%,可生化性大大改善.     

偷税罪犯罪主体新探

随着市场经济和刑法理论的发展，偷税罪的主体范围发生了变化；由纯粹自然人主体发展为自由人主体与单位主体皆可，并得到了刑事立法的认可。偷税罪主体应发展为一般主体，而不能再是学界通说所认为的特殊主体。而且，偷税罪主体只能是纳税人，扣缴义务人不能构成偷税罪主体。     

英文写作教学改革新方法探索

作者根据长期英文写作教学的实践,结合中国学生的实际,运用语言学习中的认知理论及二语习得理论,探索出一套提高学生英文写作能力和水平的教学新的方法：教学内容上,抛弃传统的基础知识板块,确立写作方法和技能在教学中的核心地位;教学主体上,改以教师为中心为以学生为中心;教学过程中,坚持师生互动的原则;教学手段上,变单一语言交流为多媒质的集体介入.     

Biological activities of chamomile(Matricaria chamomile) flowers'''' extract against the survival and egg laying of the cattle fever tick(Acari Ixodidae)

In the present work, the potential of acaricidal activity of chamomile flowers' extract was studied against engorged Rhipicephalus annulatus tick under laboratory condition. For this purpose, the engorged females of Rhipicephalus annulatus were exposed to two-fold serial dilutions of chamomile flowers' extract (0.5%, 1.0%, 2.0%, 4.0% and 8.0%) using "dipping method" in vitro. The engorged ticks were immersed in different plant dilutions (five ticks for each dilution) for 1 min and they were imme-diately incubated in separate Petri dishes for each replicate at 26 °C and 80% relative humidity. Mortality rate for each treatment was recorded 5 d after incubation. The mortality rate caused by different dilutions of chamomile flowers' extract ranged from 6.67% to 26.7%, whereas no mortality was recorded for non-treated control group. The mass of produced eggs varied from 0.23 g (in 8.0% solution) to 0.58 g (in control), with no statistical differences between the treatments and control (P>0.05). Also the chamomile flowers' extract in highest concentration used (8.0%) caused 46.67% failure in egg laying in engorged females while no failure was observed for non-treated control group. Macroscopic observations indicated that in effective concentrations of plant (4.0% and 8.0%), patchy hemorrhagic swelling appeared on the skin of treated ticks. The results presented for the first time in this study imply that chamomile may be considered as a promising plant for biocontrol of cattle fever tick disease in the field condition.     

生态语言学研究范式下的环境语篇批评与分析

作为生态学与语言学的一门交叉学科,生态语言学旨在打破观念、语言、文化及研究上的界限以开放一个创新的平台从而能够将传统意义上分离的文化同自然领域在观点和理论方面结合起来。语言是一种社会秩序的永恒介入力量,它从各个角度反映现实,并通过再现意识形态来影响社会进程。该文主要从批评性语篇分析的角度来探讨和批评环境语篇中用于弱化施事责任的语法手段,重点涉及对名词化、被动语态等手段的分析。希望借此使读者对环境语篇中操纵、隐藏施事的行为能自主识别。