增效剂SV1对农药混剂的增效作用研究

本文主要介绍氰戊菊酯加敌敌畏的混剂中加入适量的增效剂ＳＶ１，并以氰戊菊酯１份，敌敌畏５份和ＳＶ１３份的配比组合对水稻褐稻虱和蔬菜蚜虫为测试对象，进行了增效测定。试验结果表明，增效剂ＳＶ１与氰戊菊酯加敌敌畏的复剂混用，对褐稻虱和菜蚜均具有明显的增效作用。对褐稻虱和菜蚜处理２４小时的触杀毒力ＬＣ５０分别为１３．８５ｐｐｍ和０．６３ｐｐｍ，比不加ＳＶ１的混剂的触杀毒力ＬＣ５０分别高１．８２倍和１７．８１     

农药增效剂增效醚的应用

本文重点介绍农药增效剂增效醚的应用     

小地老虎的抗药性及几种增效剂增效作用的研究

本文从１９８８至１９９４年监测了小地老虎对３类９种常用杀虫剂的敏感性变化。结果表明：除敌百虫发展了中等水平抗性外，其他８种杀虫剂仅有低水平抗性或仍敏感；抗性倍数随不同年份而上下波动；增效剂ＳＶ１、Ｓ２、ＮＩＡ－１６３８８对具有抗药性的农药氯戊菊酯和敌百虫增效显著，而对无抗性的溴氰菊酯和甲胺磷无明显增效作用，这表明小地老虎对这些药剂的抗性可能与多功能氧化酶和酯酶活性增高有关。根据触杀毒力和抗性现状，     

山西农药增效剂问世

由山西省农科院植保所主持的“奇大神效王对溴氰菊酯增效作用田间药效试验”研究日前取得重大进展 ,山西惠泽生物化工有限公司研制生产的“奇大神效王”只需添加 1 5 %～ 2 %就可使溴氰菊酯农药在用量降低一半的情况下 ,对麦二叉蚜和麦长管蚜等Ｍ2 4小麦害虫混合种群的虫口减退率达到91 3%～ 99 9% ,校正防效达到 91 1%～ 99 9% ,对农药具有显著增效作用山西农药增效剂问世     

混配增效剂对菌线克增效作用

菌线克是一种用于防治线虫的新型农用抗生素,以根结线虫为靶标,通过室内毒力测定6种增效剂(TPP、DEM、PEG、NT、H3BO3、吐温-20)对菌线克的增效作用,筛选出3种增效剂单剂(TPP、PEG、H3BO3)的增效效果明显.经二元复配及最佳配伍筛选,测定混用增效剂对菌线克的增效作用,H3BO3和PEG以体积比1:1比例混合增效作用最好,增效比为5.25.     

浅谈农药增效剂的现状及应用前景

介绍了农药增效剂的作用机理、现状及应用前景,以及不同增效剂在相应农药中的应用情况。     

萤石浮选增效剂及其应用

通过在萤石浮选中增效剂对油酸的增效作用的研究，证明增效剂以低复配比组成的增效油酸，具有低温浮选和抗钙、镁离子干扰的良好的性能。增效油酸的使用，实现了碳酸盐一萤石矿在５℃低温和硅酸盐一萤石矿在３℃低温下的正常浮选。与皂化油酸和超声波乳化油酸相比，具有浮选指标提高和捕收剂量大幅降低的显著效果。     

ZWR混凝土节能增效剂的使用性能研究

对ZWR混凝土节能增效剂在商品混凝土中的应用性能进行试验研究与工程应用,结果表明,该节能增效剂在保证混凝土综合性能的情况下,掺量为胶凝材料的0.6％～ 1％,可降低水泥用量10％～ 15％,明显降低了生产成本.使用增效剂后,在不改变工作性能和结构性能的前提下,混凝土开裂的风险减少,总碱量降低.     

松节油在农药增效剂及杀虫剂中的应用与进展

介绍松节油合成农药增效剂单萜烯基酰亚胺的一般合成机理和合成工艺。并对松节油在传统杀虫剂和非杀生性杀虫剂保幼激素类似物方面的研究进展进行了论述,同时还介绍国内外利用松节油合成的一些典型杀虫剂和新产品、及其一般的合成方法。     

Damage zone in PVC and PVC/MBS blends. I. The effect of rubber content and temperature

The damage zone development in poly (vinyl chloride) (PVC) and its transparent blends with methyl methacrylate-butadiene-styrene (MBS) core/shell rubber was studied as a function of temperature and rubber content in a triaxial stress state under slow tensile loading. Failure at the semicircular notch occurred by shear yielding followed by stress whitening. In unmodified PVC, the shear yielded plastic zone size was not affected by temperature in the range between —40 and 40°. In the blends, the plastic zone preceding stress whitening increased in size with temperature and rubber content, shifting the stress-whitened zone further away from the notch root. Below 0°, stress whitening initiated at the notch root and the stress-whitened zones had a crescent shape similar to those of PVC/CPE blends studied previously. In unmodified PVC, stress whitening initiated from the growth of preexisting microvoids at the tip of the shear yielded zone containing two families of curving slip lines emanating from the notch root. In contrast, stress whitening in the blends was more intense and was initiated by the cavitation of the rubber particles.     

Preparation of Poly(acrylamide-maleic Acid) Resin by Template Polymerization and Its Use for Adsorption of Co(II) and Ni(II)

Poly(acrylamide-maleic acid) resin P(AAm-MA) was prepared by template polymerization. Polyacrylamide PAAm was used as a template for the polymerization of MA in an aqueous solution using gamma rays as the initiator. The effects on the capacity of P(AAm-MA), such as concentration of maleic acid and amount of template polymer, were investigated. P(AAm-MA) has been utilized as an adsorbent for the removal of Co(II) and Ni(II) ions from an aqueous solution. The effects of time of equilibrium, pH, temperatures, and dosage of the adsorbent on the removal of Co(II) and Ni(II) ions have been studied. The equilibrium data were analyzed using the Langmuir and Freundlich isotherm models. The equilibrium process was described well by the Langmuir isotherm model.     

全氟聚醚的合成及应用

介绍了全氟聚醚的特性，并对其合成方法和应用领域进行了叙述。全氟聚醚具有时热、耐氧化、耐腐蚀、粘流性良好、不燃、可与塑料、弹性体、金属相容、只溶于全氟有机溶剂等良好的综合性能，是苛刻环境下极为可靠的润滑剂，广泛应用于电子、化工、机械、电气、核工业、航空航天等领域。其合成方法主要有全氟环氧化物的阴离子聚合法和全氟烯烃直接光氧化法2种。     

透明质酸与皮肤的关系及其在化妆品中的应用

透明质酸作为一种重要的氨基多糖,是细胞外间质的重要组成成分,在皮肤中含量丰富,透明酸具有天然吸水、保湿性、在维持胞外离子环境和营养物质的供给方面具有重要调节作用。由于其优良的保湿性能,已广泛添加到化妆品中,但在化妆品应用中,透明质酸对完整皮肤的功效尚需要科学资料的证实。     

聚对苯二甲酸甲二酯的热分解行为及其动力学研究

研究了惰性气氛下聚对苯二甲酸甲二酯(PMT)的非等温热分解行为及其动力学,并与聚对苯二甲酸丁二酯 (PBT)进行了对比。研究发现,PMT的热降解过程包括两个主要失重阶段,其热分解反应不是一级反应。第一阶段的起始分解温度较低是由于产物的分子链末端基中含有Br或Cl能催化聚合物的降解反应;第二阶段为分子链主体的热分解过程,由于分子链中苯环的密度较大,分子链的热稳定性比具有较低苯环密度的PBT要高。而PBT的降解失重过程仅为一个阶段,为一级反应。     

防治蔬菜菜青虫高效、低毒、无公害农药的筛选

通过对10种杀虫剂田间小区药效筛选试验,结果表明锐劲特、阿维菌素、高渗苦参碱、高效氯氰菊酯、氯氰菊酯、B.t.对菜青虫具有良好的防治效果。其中锐劲特、阿维菌素、高渗苦参碱和B.t.具有高效、低毒、无公害等特点,是无公害蔬菜生产中防治蔬菜害虫的理想药剂。     

ECMO临床应用分析

目的总结ECMO在临床使用中的经验。方法ECMO辅助患者多例。术后严密监测,积极治疗。结果出现出血、血栓、感染等并发症。结论ECMO的选择以及并发症的处理是决定使用ECMO能否成功的关键。     

Tensile yield parameters for poly(vinylchloride) blends with a methyl methacrylate–butadiene–styrene impact modifier

Tensile yield measurements were made on blends of poly(vinyl chloride) (PVC) with a methyl methacrylate-butadiene-styrene impact modifier (MBS) covering a blend range of 0 to 20 wt % MBS, a temperature range of ?50 to 25°C, and a strain rate range of 10^?3 to 10° s^?1. Increasing MBS level in PVC reduces the tensile yield stress. The tensile yield stress variation with temperature and strain rate at constant MBS level was represented in terms of the Ree-Eyring-Roetling rate model. This model represents the experimental data within experimental error. The tensile yield parameters were also determined by assuming that stress concentrations exist around the modifier equatorial plane. Estimates of these stress concentrations were made and are discussed in terms of Goodier's model for spherical inclusions.