乙醇/汽油混合燃料对电喷汽油机排放特性的影响

采用增氧剂乙醇替代甲基叔丁基醚,在发动机台架上研究了不同掺混比混合燃料对电喷汽油机排放特性的影响及三效催化器的净化性能。实验结果表明,汽油机掺烧乙醇后,在低转速时CO排放有所升高,而在中高转速时CO的排放改善程度较小;在所有转速条件下,THC排放量都有所降低,其中E4组（无水乙醇添加量9．826％）燃油对THC排放改善效果较明显,降低幅度接近40％,而NOx排放仅在中低转速时降低较明显。催化转化器对CO和THC净化效率分别为42％～99％、58％～93％,对NOx的催化转化率相对低一些,平均约为27％。三效催化器的转化效率与燃料中乙醇含量、汽油机转速和负荷有关。     

蚯蚓粪、牛粪、商品有机肥在番茄上的 应用效果试验

摘要：为研究蚯蚓粪在番茄生产上的最佳用量,以番茄“希唯美191”为试材,采取完全随机设计, 比较不同用量蚯蚓粪与不同用量牛粪及商品有机肥对番茄长势、产量、品质等的影响。结果表明：施用蚯 蚓粪提高了土壤碱性,但降低了土壤盐害;施用牛粪增加了土壤盐含量,且土壤有机质含量随牛粪施用量 的增加而增加;定植前,施用牛粪有利于作物养分的供应,蚯蚓粪比普通有机肥在土壤中会更快、更多地 释放有效养分。定植前增施有机肥有利于番茄快速生长,T3（667 m2 增施蚯蚓粪2 t）、T4（667 m2 增施蚯 蚓粪3 t）、T6（667 m2 增施牛粪2 t）、T7（667 m2 增施牛粪3 t）处理的番茄长势、产量、品质均优于其他 处理,尤其是T3处理（667 m2 增施蚯蚓粪2 t）的番茄产量、可溶性蛋白含量、可溶性固形物含量和糖酸 比均最高,较对照分别提高了39.82%、1.2个百分点、0.2个百分点和26.43%,总酸含量最低,较对照降低 19.37%,果实品质最好。     

Spectrophotometric determination of ferbam (iron(III) dimethyldithiocarbamate) in a commercial sample and wheat grains using 4,7-diphenyl-1,10-phenanthroline

A procedure has been developed for the determination of iron(III) dimethyldithiocarbamate by converting it into iron(III)- bathophenanthroline complex, which is then dissolved in water in the presence of sodium dodecyl sulphate as a surfactant, and the absorbance measured at 532 nm against a reagent blank. Beer's law is obeyed over the concentration range 0.3–20 µg ml⁻¹ in the final solution. The method is sensitive, highly selective and can be used for the determination of ferbam in a commercial sample, in mixtures with various dithiocarbamates (ziram, zineb, maneb, etc.) and from wheat grains. © 1999 Society of Chemical Industry     

Methods of analysis of dithiocarbamate pesticides: a review

This review incorporates a brief introduction to methods for the analysis of dithiocarbamate pesticides followed by a more detailed discussion of individual methods. Determination of dithiocarbamate residues from foodstuffs, water and commercial samples and in various environmental samples using different techniques is a key feature. © 1999 Society of Chemical Industry     

包头市商业服务业用地集约利用潜力评价研究

城市商业服务业用地评价是城市土地集约利用潜力评价的重要组成部分。本文较为详尽地阐述了包头市城市商服用地评价的过程、基本步骤和基本评价方法。通过评价,得出包头市城市商业服务业用地基本处于适度利用水平的结论。     

膨化秸秆微生物发酵饲料对杜寒杂交肉羊瘤胃发酵的影响

[目的]以粗饲料作为唯一变量,研究膨化秸秆微生物发酵饲料对杜寒杂交肉羊瘤胃发酵的影响.[方法]选择81只3月龄、体重为(23±1.0)kg的杜寒杂交羔羊,随机分为对照组(70％精料+30％干秸秆)、试验Ⅰ组(70％精料+30％膨化秸秆微生物发酵饲料)和试验Ⅱ组(70％精料+30％膨化秸秆微生物发酵饲料,再添加占日粮总蛋...     

The effects of water additive Bacillus cereus and Pediococcus acidilactici on water quality,growth performances,economic benefits,immunohematology and bacterial flora of whiteleg shrimp (Penaeus vannamei Boone, 1931) reared in earthen ponds

This study was aimed to investigate the effects of two probiotics, Bacillus cereus and Pediococcus acidilactici, on the water quality, growth performance, the survival ratio, economic benefits, immunohematology and bacterial flora in the intestine of whiteleg shrimp, Litopenaeus vannamei after 110 days. Nine earthen ponds (each one 1.2 hectare) were adjusted as three treatments including control (without adding bacteria), containing P. acidilactici probiotic (10⁶ CFU/mL) and containing B. cereus probiotic (10⁶ CFU/mL). The results showed that the adding B. cereus and P. acidilactici to the water pond positively decreased nitrate, ammonia and biochemical oxygen demand when compared with the control group (p < .05). Regarding growth performance, treating shrimp with B. cereus caused significantly higher weight gain (16.72 g) and survival ratio (94.50%) in comparison with control group (p < .05). Using these probiotics could increase shrimp production (27.30%, 18.42%) and net income (92.94%, 49.20%) as well. Respect to immunity, total hemocyte count (9.00), total protein (8.92 g/dl) and lysozyme activity (21.55 U/ml) in treated whiteleg shrimp with B. cereus were significantly higher than those untreated (p < .05). In conclusion, adding B. cereus (10⁶ CFU/ml) to the earthen pond can be suggested in shrimp farm.     

Sea turtle bycatch in Argentina: A qualitative assessment in commercial vessels

1. The Northern Argentine continental shelf is a sea turtle feeding ground that overlaps with important fisheries. Few studies assessed bycatch impact, especially on commercial vessels. 2. This work documents sea turtles' bycatch, fishery involved, species captured and crew actions. 3. Bycatch in four fisheries were registered at the 107 interviews to fishers conducted between 2021 and 2023, showing the urgency to research bottom trawling for demersal multi-species. Fishers frequently recognize Caretta caretta, and positive and negative practices towards animals have been documented on-board. 4. These results will help focus researches on fisheries with the greatest impact on sea turtles in the region. They also underscore the necessity for implementing commercial vessel monitoring programmes and improving on-board handling practices.     

湘西地区油桐优树选择初报

油桐选优去劣是防止品种退化、实现油桐良种化的主要途径。对油桐优树选择标准、选择方法进行了初探,得出各性状在选优中所占权重。并以此为依据,对优树的种子繁殖和优树的枝或芽与选定的砧木进行嫁接繁殖以及防止良种退化予以指导。