石膏型熔模铸造工艺研究

介绍了石膏原材料的组成和性能,阐述了石膏型熔模铸造的工艺过程。应用此法生产整体,复杂的铝合金精密铸件,能够获得良好的技术经济效益。     

最终传动箱体工艺及模具设计

介绍了如何对最终传动箱体零件进行铸造工艺分析,确定铸造工艺方案,合理地选择分型面、分芯面、收缩率、机械加工余量等工艺参数,同时对浇注系统运用大孔出流理论进行了计算,最终使该铸件满足机械加工要求,获得了合格的零件。     

两种新杀菌剂对番茄灰霉病的作用方式及田间防效

采用离体叶片法测定了2种新杀菌剂42.8%氟吡菌酰胺·肟菌酯悬浮剂(SC)和22.5%啶氧菌酯SC对番茄灰霉病的作用方式及田间防效。结果表明:42.8%氟吡菌酰胺·肟菌酯SC和22.5%啶氧菌酯SC对番茄灰霉病保护作用的EC50值分别为4.04μg·mL~(-1)和10.79μg·mL~(-1),治疗作用的EC50值分别为26.30μg·mL~(-1)和45.93μg·mL~(-1)。田间试验结果表明,两种新药剂在推荐剂量下对番茄灰霉病防效可达80%以上,可用于番茄灰霉病的防治。     

金线莲灰霉病病原菌的分离与鉴定

以广东河源地区温室大棚发病典型的金线莲病株为试材,对病原菌进行分离、致病性检测以及形态、分子鉴定.结果表明,引起广东河源金线莲叶片腐烂、茎部腐烂溢缩、植株倒伏等病症的是由葡萄孢盘菌(Botrytis)侵染引起的灰霉病.该病害在温室大棚低温高湿条件下易发病,且发病面积大、传染速度快.金线莲灰霉病的分离和鉴定可为制定相应的防治策略提供科学的理论依据.     

实木框架异型家具构件封边技术

针对家具构件异型边部在胶压5 ～8 mm厚度实木板条时存在的生产效率低、工艺复杂、标准化程度不高、加工精度无法保证等问题,开发了软模热压式封边装置,并制定了相应的工艺规范.研究表明,金属壳体内橡胶充气袋增压和导热管内热油加热,对家具构件异型边部胶压厚度为5～8 mm的实木板条十分有效.这不仅提高了实木封边的生产效率,规范了生产工艺,而且具有较强的实用性.     

霉菌毒素的研究进展

霉菌毒素是霉菌在生长繁殖过程中产生的有毒次级代谢产物,在饲料中广泛存在,主要包括黄曲霉毒素、赭曲霉毒素、烟曲霉毒素、玉米赤霉烯酮、单端孢霉菌素等。目前,关于单一霉菌毒素的毒性研究报道较多,而对多种霉菌毒素的联合毒性进行探索将是今后霉菌毒素研究的热点。     

长沙市郊菜园土及部分蔬菜重金属和氟污染状况的研究

长沙市郊菜园基地土壤中,以岳麓乡的岳华村重金属的污染比较严重,土壤中铜、锌、镉的含量居各区菜园土之首。在各污染元素中,则以镉的污染比较严重,铅、锌次之,铜、铬、氟则只有部分菜地有污染,所研究的蔬菜中,叶菜类镉的含量大多超过镉的卫生标准,不同种类的蔬菜中,叶菜类重金属的污染程度大于果菜类。     

塑造图书馆办公室的良好形象

阐述了高校图书馆办公室的性质、地位和特点,在此基础上讨论了如何建立和塑造图书馆办公室的良好形象。     

25%多·霉威SC防治番茄灰霉病的药效试验

试验结果表明,25%多·霉威SC300～400倍液对番茄灰霉病有较好的防效,显著优于50%多菌灵WP600倍的防效,与50%速克灵WP1000倍的防效相当,使用安全,是一种对番茄灰霉病经济有效的杀菌剂。     

The severity of field pea diseases depending on sowing rate and variety

ABSTRACT

Six varieties of field pea (Pisum sativum L.) were sown at two sowing rates over two years to assess the impact on disease occurrence in a Baltic climate. The varieties used were Bruno (Latvia), Capella (Sweden), Clara (Sweden), Kirke (Estonia), Onward (Greece), and Vitra (Latvia). The two sowing rates were 120 seeds per m² and 144 seeds per m². The increase in sowing rate by 20% did not influence field pea diseases. Variety influenced the incidence of disease in field pea. The varieties most damaged by pod spot (Ascochyta blight caused by Ascochyta spp.) were Vitra and Onward and least damaged were Bruno and Clara. The variety most damaged by downy mildew (caused by Peronospora viciae) was Vitra and least damaged was Bruno. The variety most damaged by white mould (or Sclerotinia rot caused by Sclerotinia sclerotiorum (Lib.) de Bary) was Onward. The varieties that had the most disease damage were Vitra and Onward, while least susceptible were Clara and Bruno. Therefore, Clara and Bruno are recommended for field pea production in a Baltic climate.