高聚物注浆及离心浇筑法在检查井修复中的应用

针对市政管网检查井因老化等因素影响发生的破损、渗漏等容易造成水环境污染、水土流失、地面坍塌的问题,以天津市高水位地区某检查井为例,阐述高聚物注浆及离心浇筑法非开挖修复检查井的原理、设计思路、施工流程。工程实践表明,该方法能有效且高效地非开挖修复高地下水位地区老旧检查井存在的结构性缺陷。

Fe/Cr涂层抗热腐蚀性能研究

设计制造出Fe/Cr粉芯丝材,利用电弧喷涂技术制备出耐高温腐蚀的工作涂层。运用光学显微镜、扫描电子显微镜(SEM)、X射线衍射仪(XRD)等研究了电弧喷涂Fe/Cr合金涂层的微观结构、腐蚀动力学和高温下的腐蚀性能。结果表明,该涂层组织致密,涂层中形成Cr2O3或尖晶石型氧化物是其具有优异的抗高温腐蚀性能的主要原因,涂层抗高温腐蚀性能较好。

透明状水基型杀虫喷射剂的研究

目的 研究药效与乳化性能稳定的透明状水基型杀虫喷射剂。方法 采用冷、热贮存和自然室温存放相结合的方法进行乳化稳定性观察和药效试验。结果 本次研制的透明状水基型杀虫喷射剂,新配制和冷(0℃)、热(54℃)贮存 4周室内药效测定KT50 (min),对家蝇依次为 2. 21, 2. 05, 2. 01, 2 .54和 3. 11min;对致乏库蚊依次为 2 .54, 2 .50, 2 .83, 2. 35和 3 01min;对德国小蠊依次为 3 .45, 3. 35, 3. 72, 3. 87和 4. 01min。自然室温存放 2.年的室内药效测定KT50 (min),对家蝇依次为 2 . 11和 2. 85min; 对致乏库蚊依次为 2 .34和3 75min; 对德国小蠊依次为 3. 50和 4 .06min。室内和模拟现场药效测定的死亡率均为 100%。结论 本次研制的配方组分和选用乳化剂科学合理,药效和乳化性能稳定,对昆虫死亡率高,能保证 2年的有效期,适宜于室内空间喷雾,与脱臭煤油作溶剂的气雾杀虫剂相比较,具有环保和经济意义,值得推广应用。

植保施药机械喷雾雾滴飘移研究进展

中国农药产品80%以上通过喷雾方式施用,药液从喷头到靶标作物过程中产生的随风飘移和蒸发飘移是农药造成人畜健康风险、生态环境破坏的重要因素之一。随着航空施药技术的发展,解决或减少喷雾雾滴飘移的问题成为施药技术研究的重点和热点。基于此,本文分别从喷雾雾滴(尺寸分布、黏度、表面张力、蒸气压、挥发性、密度等)、喷雾模式(喷头类型、喷雾速度和高度、喷施方法)和外界条件(风速、风向、温度、湿度、气流等环境条件和操作人员技术水平等)等方面系统分析了产生雾滴飘移的主要原因;同时详细综述了采用田间试验、室内试验、计算机模拟及新型测试技术测定喷雾雾滴飘移的优点及局限性,针对植保无人飞机施药,提出应通过室内测定、田间试验与计算机模拟相结合的方式开展雾滴飘移研究。在此基础上分析并总结了从改变雾滴的运动方式、理化性质等方面直接控制和从田间布局间接控制的喷雾雾滴飘移风险控制技术。

Evaluation of the Efficacy and Safety of 1%Sodium Chloride(LiceFreee Spray)against 1%Permethrin Creme Rinse on Head Lice Infested Individuals

Head lice are a public health issue, and resistance to available over-the-counter pediculicides is a concern. The objective of this randomized study was to evaluate the pediculicidal activity and safety of 1% Sodium Chloride spray (0.1709 M), (LiceFreee Spray&#174) compared to the current recommended treatment for head lice with 1% Permethrin Crème Rinse. Forty-two subjects were randomized equally into Sodium Chloride or Permethrin group. Products were applied to hair according to the label instructions. After application of the products at Day 1 and Day 8, pediculicidal efficacy and safety were assessed at Day 1, Day 8 and Day 15. Second treatment was only applied on Day 8 to individuals with observed live lice using the same products and protocols as Day 1. Proportion of lice free subjects per group, the reduction in number of live lice per head and adverse effects were recorded after each visit. The results showed significantly higher pediculicidal activity for Sodium Chloride spray (85%) as compared to Permethrin (45%) at Day 15 (p 0.05). Similar numbers of lice per head (21.76 range 10 to 68 versus 21.29 range 10 to 60 for Sodium Chloride and Permethrin groups, respectively) were observed for individuals at Day 1. At Day 15, lice per head infested reduced to 0.55 ± 1.50 in Sodium Chloride spray group compared to 5.45 ± 7.91 in the Permethrin group (p 0.01). No serious adverse effects were observed in both groups. Sodium Chloride spray had superior efficacy to 1% Permethrin Crème Rinse in treating head lice and is a safe and excellent alternative to the current recommended treatment.

聚氨酯硬泡外墙外保温技术在既有住宅楼节能改造中的应用

该技术在墙体外侧采用现场喷涂聚氨酯硬泡作为保温层,以钢丝网水泥砂浆作保护层,并用塑料胀管螺丝将基体和护层连为整体。具有轻质整体、高效保温、粘接牢固、防水、耐老化、施工方便等优点。15年工程实践检验证明,该技术工艺技术可靠,操作简便易行,监理检查直观,节能效果显著。既适用既有建筑维修改造,又适用于新建筑保温节能。该技术于2002年1月23日通过了吉林省建设厅组织的科技成果鉴定。