关于温州市推行水稻机械栽插的思考

文章首先分析了浙江省温州市机插的现状,指出加快突破插秧机械化技术瓶颈,已成为推进水稻生产全程机械化,实现农业现代化的重要主攻方向,要制订切实可行的水稻插秧机械化推进计划;从节省秧田、节水肥药、节本省工、高产稳产、避灾增效、五个方面阐述了机插的优势,从技术上可行、政策上有利、推广有依托、多数农民观念转变四个方面阐述了机插有利条件;最后提出推进水稻机插的对策与措施。     

单边支重轮半体切边-冲孔复合模设计

介绍了在曲柄压力机上切边冲孔的复合模结构设计、工作原理及装配和调试要求等.     

Design Method of Moment-strengthening on Tension Side When Load Un removed

Based on the linear strain distribution assumption, strain development of tensile bars and ultimate moment capacity of strengthening section, which strengthened on tension side with service load un removed, is investigated. It is showed that the higher the service load bending moment to original moment capacity ratio M 1k /M u1 is, the smaller the tensile strain of strengthening re barsis, and the more the amount of strengthening re barsis, the smaller the tensile strain of original re barsis. It also showed that,When original re bar area is relatively small and strengthening re bar area is adequate, both original and strengthening re bars may get yielded and a great increment in section moment capacity is achieved, even though the ration M 1k M u1 has a relatively high value.     

退耕还林还草中建立生态系统与经济系统“弹性资源”初论

退耕还林还草中．建设生态系统与经济系统“弹性资源”,对于良性生态经济系统调控机制的形成具有重要的作用。通过对其概念的界定．得出了生态系统与经济系统“弹性资源”的3个重要特征：(1)具有多种可供利用的途径．可满足不同阶段生态环境建设和商品生产发展的需求;(2)具有稳定的生态经济系统结构和良好的自我调控机制;(3)满足生态目标、经济目标和社会目标的有机统一。以县南沟示范区为例研究了其弹性资源建设标准和进展。     

A New Method for Measuring Bonding Shear Properties of Adhesives on Steel Substrates

Single-lap-joint adhesively bonded metal specimen which is the national standard experimental method in use has an extremely non-uniform distribution of shear stresses along the joint, and tensile stress concentration of high values is produced on the steel substrate interfaces. Therefore the test result, which is not the real bonding shear strength between adhesive and steel substrates, can only be used as a test index for qualities of adhesives not the strength criterion for load is capacity evaluation. The combined bonding disc specimen is adopted for measuring bonding shear properties of adhesive on steel substrates, has a very uniform distribution of shear stresses in adhesive and along the bonding surfaces of steel substrates, of which the uniform coefficient is greater than 0.97. Furthermore, when adhesive joint is treated as an arc and steel substrates are chamfered at both ends of the joint, tensile stresses on the bonding surfaces can be reduced to less than 20 MPa which can hardly cause tensile failure. Thus, the results of combined bonding disc specimens can actually represent the real bonding shear strength or bonding shear-compression strength between adhesive and steel substrates, which can be used as strength criterion for load capacity evaluation of bonding members.     

超声波循环提取大豆异黄酮的研究

大豆(Glycine max)种子中含有高生物活性的异黄酮类物质,但传统的提取方法耗时费事,效率低.实验采用超声波在常温常压下循环提取大豆中的异黄酮,时间短,效率高,并对超声波提取大豆异黄酮的工艺参数进行了研究,为超声波提取大豆异黄酮走向工业化提供了一定的理论和技术依据.     

优质黑皮大豆庐州黑的高产栽培技术研究

[目的]为了解决在生产中黑皮大豆庐州黑农艺措施不当、单产不稳的问题,发挥该品种的增产潜力。[方法]采用正交试验设计L(934)研究播期、密度、施氮量对优质黑皮大豆庐州黑产量的影响。[结果]播种期为5月31日,密度为10.5万株/hm2,施纯氮为69.0kg/hm2处理的产量居第一位,达4183.5kg/hm2。[结论]庐州黑为迟熟大豆品种,对温、光条件较为敏感,在巢湖市种植的适宜播期为5月下旬、密度为10.5万株/hm2,中等肥力地块施纯氮37.5～52.5kg/hm2;低肥力地块施纯氮52.5～67.5kg/hm2;高肥力地块不施或少施氮素。     

20种有毒植物的不同提取物对玉米弯孢叶斑病菌的抑菌活性测定

用生长速率测定法，测试了长白山20种有毒植物的不同溶剂提取物对玉米弯孢叶斑病菌（Curvularia lunata Boed．）的离体抑制活性．结果表明，供试20种有毒植物的不同溶剂提取物在稀释1000倍的情况下，艾蒿正丁醇提取物对供试病原菌的菌丝生长抑制率最高（81．01％），藜芦生物碱提取物与延胡索氯仿提取物也表现出较高的活性。     

胚发育时间和禾谷镰刀菌粗毒素对小麦幼胚愈伤组织诱导及幼苗分化的影响

以3个小麦品种为材料,研究了幼胚发育时间和禾谷镰刀菌粗毒素对小麦幼胚培养特性的影响。结果表明,胚发育时间对小麦幼胚离体培养有较大影响,花后10~13 d的小麦幼胚诱导产生的愈伤组织质量较好,胚性愈伤组织诱导率较高,是适宜的取材时间;禾谷镰刀菌粗毒素对不同小麦品种幼胚愈伤组织、胚性愈伤组织和苗分化的影响趋势相同,粗毒素为6.0 g/L时,对小麦幼胚愈伤组织诱导有明显抑制,低于6.0 g/L时有一定的促进作用;粗毒素在0~6.0 g/L对胚性愈伤组织形成及苗分化的影响随浓度增高抑制作用增强,在6.0 g/L时胚性愈伤组织的形成能力较低或丧失;适宜的粗毒素筛选浓度为1.5~4.5 g/L。     

土壤的农药污染及修复技术

论述了土壤农药的污染现状及危害,从物理、化学和生物等方面叙述了当今对土壤农药污染进行修复的方法,并对其修复技术中存在的问题及发展趋势进行探讨。