一种新型管式曝气装置的设计与试验

随着水产养殖业逐渐向高密度、集约化方向的发展,为实现氧气(O_2)高效溶解、二氧化碳(CO_2)调控、流态改善等目的,急需研制新型高效曝气装置,开发高效节能的曝气技术。基于气水两相溶解的双膜理论和文丘里原理,设计开发了一种管式曝气装置,经初步试验获得了影响增氧性能的关键技术参数,并以此为基础对曝气装置进行优化设计,研究新型节能增氧技术。试验结果表明,管式曝气装置中影响曝气效果的因素有水面高程(Hw)、缩径(D_1/D_2)、旋混结构、进气口大小、进气量等。水面高程、缩径、进气口越大,进气量越充足,曝气装置的增氧效果越高;而额外增加延长结构和旋混结构后,曝气装置水头损失增大、进气量下降,从而导致增氧效果显著下降。该装置利用额外水流动力实现增氧,是一种高效、节能、经济的新型曝气装置,可为水产养殖提供一种新的增氧方法。     

水冷振动炉排秸秆锅炉调研情况

通过调研把生物质水冷振动炉排锅炉和点火系统以及输料和给料系统情况记录下来,帮助以后对秸秆发电技术的设计和改进。     

Evaluation of Factors Influencing the Generation of Ammonia in Different Bedding Materials Used for Horse Keeping

Bedding material is an important factor in determining stable air quality in terms of ammonia formation. The objective of this study was to analyze different bedding materials used for horse stables under standardized conditions, to determine which material is best suited for improving the climate of a stable. The particular concern was a reduction in gaseous ammonia concentrations. Therefore, the following materials were examined: wheat straw, wood shavings, hemp shives, linen shives, wheat straw pellets, and paper cuttings. Twelve containers were constructed in an environmentally controlled room, and the same material was placed into two containers, with the amount of material used being determined by its carbon content. A defined ratio of horse manure/urine mixture was added daily to each container over a period of 14 days. The concentrations of gaseous ammonia, carbon dioxide, nitrous oxide, and water vapor were measured continuously above the bedding within the containers. Means of gaseous ammonia were found to be 178.0 mg/m³ for wheat straw, 155.2 mg/m³ for wood shavings, 144.6 mg/m³ for hemp, 133.7 mg/m³ for linen, 60.3 mg/m³ for straw pellets, and 162.6 mg/m³ for paper cuttings. In conclusion, the results of this study have shown that straw pellets are suitable for horse stables, not only to improve air quality but also, first and foremost, in relation to ammonia binding and ammonia transformation within the bedding material, respectively. However, straw pellets may also have disadvantages. The high substrate temperatures that were measured in straw pellets could favor the growth of pathologic germs that can adversely affect animals' health.     

试论新时期校园物质文化景观的教育功能与建设

校园物质文化景观作为一种隐性课程 ,以潜移默化的方式对学生产生巨大影响而受到教育工作者的普遍关注。从内涵、教育功能、建设等方面对校园物质文化景观进行了分析     

春谷(粟)抗粒黑穗病优良种质材料的创新研究

通过不同类型抗性亲本杂交选育和连续人工接菌鉴定，创新出４份对粒黑穗病免疫和高抗、且农艺性状优良的育种材料，可提供育种单位利用。     

加网混合料疲劳特性的研究

为了探讨路面结构层中加入纤维格栅后的疲劳特性，就ＡＣ１３Ｉ型的细料式沥青混合料加网与不加网２种情况进行了疲劳对比试验，分析了试验结果，得出了加网与不同加混合料的疲劳方程以及我后同等应力水平下混合料疲劳寿命提高６倍结论。     

几种常用建材的等温吸放湿线试验研究

设计建造了恒温恒湿试验台，用盐水饱和溶液保持小室恒定的湿度，通过对３种常用建材的平衡湿容量研究，试验得到其等温吸放湿曲线，为围护结构动态湿特性研究提供了基本数据。     

竹材造纸的发展前景

随着我国纸制品市场需求的迅速扩大和天然林资源保护工程的不断深化，造纸行业产品需求与原料供应的矛盾日益突出。本文简要分析了我国造纸原料结构调整的必要性，介绍了竹材纤维的制浆造纸性能，分析了竹材造纸的优势所在，指出了在当前及今后一段时期内利用竹材造纸是调整我国纸业原料结构的有效途径。     

浅淡景观规划中的绿色建材

使用绿色建材是可持续景观规划的方法之一,它是指那些在整个生命周期的过程都考虑了其对环境影响的材料。通过对我国相关标准的比较,提出在景观规划中使用绿色建材以减少对环境造成的破坏,维持生态平衡发展的建议。     

农资连锁企业信息管理存在的问题及其对策研究

分析了农资连锁企业信息管理现状,并针对农资连锁企业信息管理存在的问题提出对策建议。