LASER REMELTING OF THE NiCoCrAlY PROTECTIVE COATING

NiCoCrAlY protective coating is remelted on the GH140 alloy surface by 2KWCO2 gas laser,the results of which show that,by controlling proper laser technological parameters, the constitution can be fined,the composition can be well distributed,and the coating compactness and adhesion can be obviously enhanced in the laser-remelting zone. Thus,corrosion resistance and thermal fatigue resistance is effectively improved,and the good plasticity of the original coating is remained.     

Synthesis of Polyaniline/Epoxy Composite Anti-corrosion Coatings by Chemical in-Situ Polymerization

Polyaniline/epoxy(PAn/EP) resin as a composite anti-corrosion coatings is prepared by chemical in-situ polymerization.The effect of reactive conditions on the properties of polyaniline/epoxy composite coating such as mass ratio of PAn/EP,dosage of oxidantand and reactive time are discussed.The microstructure of the coating is characterized by AFM and TEM.     

水润滑橡胶轴承摩擦试验研究

利用水润滑轴承专用橡胶材料/镀镍钢配副,分别在干摩擦、湿润滑以及完全水润滑条件下,在数显式高速环块摩擦磨损试验机上进行摩擦磨损试验研究,并借助SEM分析了在不同润滑条件下水润滑轴承专用橡胶材料/镀镍钢摩擦副的摩擦磨损机理。结果认为干摩擦条件下主要为粘着磨损,湿润滑条件下主要为磨粒磨损,而完全水润滑条件下以边界润滑为主。     

Effects of coated hatching eggs obtained from old broiler breeders with chitosan on embryonic growth,hatching results and chick quality

The aim of this research was to determine the effects of coating broiler hatching eggs with chitosan on egg quality, embryonic growth, hatching results and chick quality. Eggs obtained from old broiler breeder, aged 59 weeks, were used. Eggs were divided into two groups (coated with chitosan and uncoated) groups. Each group was divided into three groups according to the storage period. Eggs were stored for periods of 1, 4 and 7 days at 15°C and 80% humidity. Then, they were incubated. Storage period of eggs up to 7 days did not affect the egg quality, egg weight loss, embryo growth, chick properties and hatchability of fertile eggs. However, embryo development, relative residual yolk sac weight and relative chick weight were affected by coating eggs with chitosan. Interaction was not found between storage lengths and coating of eggs with chitosan for all examined parameters. The results of the present study suggested that hatching eggs obtained from old broiler breeder flocks were immersed into chitosan solution once and quickly have negative effect on the embryo weight, yolk sac absorption and relative chick weight. It has been observed that covering the hatching eggs with chitosan is not suitable in this respect even if immersion takes place once and in a short time.     

纳米Fe~(3+)/TiO_2改性聚乙烯醇基紫胶复合膜对鸡蛋的保鲜效果

为了探究纳米Fe3+/TiO2改性聚乙烯醇基紫胶复合膜对清洁鸡蛋的保鲜效果,该文中将新鲜鸡蛋分组后涂上聚乙烯醇(polyvinyl alcohol)单膜和纳米Fe3+/TiO2改性聚乙烯醇基(polyvinyl alcohol)紫胶复合膜后,测定储藏过程中各组鸡蛋的感官品质、失重率、哈夫单位(haugh units,HU)、蛋黄指数、色差、pH值和菌落总数等,再对各项指标进行统计分析。结果表明:各组鸡蛋的品质指标在储藏过程中都有显著变化(P0.05);贮藏过程中纳米Fe3+/TiO2改性聚乙烯醇基紫胶复合膜组的鸡蛋品质指标显著优于聚乙烯醇单膜组和未涂膜组(P0.05),表明复合膜对鸡蛋的保鲜效果优于聚乙烯醇(polyvinyl alcohol)单膜和未涂膜。未处理的和清洗消毒过的,聚乙烯醇基单膜涂膜包装后的,和纳米Fe3+/TiO2改性聚乙烯醇基紫胶复合膜涂膜包装后的清洁鸡蛋,其保质期分别为20~30、50~60和70~80 d,表明聚乙烯醇单膜可延长鸡蛋保质期30 d左右而复合膜可延长达50 d左右;该研究结果为纳米改性复合涂膜材料在新鲜鸡蛋贮藏保鲜上的应用提供参考。     

多面体低聚倍半硅氧烷改性水性聚氨酯木器漆的研究

一种新型的纳米级有机/无机杂化材料——多面体低聚倍半硅氧烷(POSS)引起了人们的广泛关注。向聚合物体系中加入很少量的POSS便会使复合材料的性能得到明显提高。首先利用顶角-盖帽法合成POSS,用其改性水性聚氨酯木器漆。采用FT-IR、TGA、XRD对复合材料进行表征,并且测量复合材料在室温下接触角。结果表明,POSS能够均匀地分布在漆膜中,形成有机-无机互穿网络结构。此外,POSS的加入提高漆膜的耐热性能,增加涂膜的疏水性。漆膜的机械性能除附着力外均有所提高。     

60％吡虫啉SC种衣剂拌种对水稻苗期虫害的防治效果及秧苗素质的影响

[目的]研究60％吡虫啉sc种衣剂拌种对水稻苗期害虫的防治效果及秧苗素质的影响。[方法]设4个处理,于水稻秧田期进行拌种处理。[结果表明]60％吡虫啉Sc种衣剂对秧田灰飞虱和蓟马具有较好的防治效果,lkg稻种拌60％吡虫啉sc种衣剂5ml对灰飞虱揭膜后20d的防效在85．51％,对蓟马的防效在90％以上,控制期长达30d以上,且对水稻秧苗素质的提高有明显作用。[结论]60％吡虫啉sc种衣荆是秧田期控制灰飞虱和蓟马为害的理想药剂。     

不同药剂·方法和时间浸种对水稻恶苗病的防治效果

[目的]研究不同药剂、方法和时间浸种对水稻恶苗病的防治效果.[方法]选择生产上常用及目前新上市的几种药剂,采取不同方式、时间等进行试验,以明确最佳药剂及处理方式.[结果]咪氰烯菌脂及其复配剂防效优异,浸种方法、时间与效果无明显相关性.咪鲜·杀螟丹日浸夜露法优于连续浸种法;24～60 h浸种时间延长,秧田期防效有升高趋势,但分蘖和灌浆期不明显.亮盾、适乐时与锐胜混用拌种,前期防效较高,但灌浆期（后期）效果下降.杀螟·乙蒜素防效一般.[结论]氰烯菌酯及其复配剂效果表现优异.     

种衣剂拌种对沙棘种子繁苗效果的影响

采用种衣剂拌种进行沙棘育苗试验,当年秋季进行沙棘苗生长量和苗木产量的调查,探讨种衣剂拌种对沙棘种子繁苗效果的影响。结果表明：包衣剂拌种能够显著提高沙棘苗木生长量,比对照多繁育27万株·hn-2;种衣剂拌种后繁育的苗木苗高、地径与对照差异显著,苗高比对照提高48.65%,地径提高33.34%;主根长较对照提高43.7%,差异达极显著水平;侧根数提高18.8%,差异不显著;种衣剂拌种后沙棘苗木根系腐烂率为8.9%,比对照低4.3个百分点。种衣剂拌种是半干旱区繁育沙棘优质苗木的有效技术措施。     

Effects of supplementation of coated crystalline amino acids on growth performance and body composition of juvenile kuruma shrimp Marsupenaeus japonicus

Supplementation of crystalline amino acids (CAA) in shrimp diets is unsuccessful in most cases. In the present study, various pre‐coated CAA were developed to minimize the leaching losses from diets in water and assessed using kuruma shrimp Marsupenaeus japonicus juveniles. Experimental diets were supplemented with coated CAA or non‐coated CAA to simulate the dietary amino acid profile to that found in the whole body protein of shrimp. The four diets contained CAA coated with either carboxymethyl cellulose (CMC) (diet 1), zein (diet 2), k‐carrageenan (diet 3) or agar (diet 4), respectively. Another four diets contained CMC‐coated CAA with the addition of either zein (diet 5), casein‐gelatin (diet 6), zein and k‐carrageenan (diet 7), or casein‐gelatin and k‐carrageenan (diet 8), respectively. The 8 weeks feeding trial demonstrated that the diets containing coated CAA gave significantly higher weight gains than diets containing non‐coated CAA, with the highest value for the diet 6. The diets containing coated CAA also yielded higher feed conversion efficiency, protein efficiency ratio, and specific growth rate than diets containing non‐coated CAA. Leaching trials suggested that shrimp growth performance was improved partly due to the retardation or reduction of CAA leaching by coating them with specific binders.