承载索许用荷重设计法研究

原传统的许用应力法,在承载索设计计算中运算繁琐,应用不便。本文提出许用荷重设计法,在抛物线理论的基础上推导出一系列计算公式,编制承载索数值表,建立起系统的许用荷重设计方法。     

趋势面分析在滑坡防治工程设计中的应用

滑坡治理工程的设计主要依据滑坡面及滑体方量,滑坡的上表面一般很容易得到,而下表面则可以根据地形图中等高线来确定,但是要得到准确的滑坡面则相对较难,常用的方法是选择适当的个别点进行钻探,测得该点处滑坡厚度,再由此模拟滑坡面。以四川省古蔺县蔺双公路K1＋100滑坡的滑动面（带）为例,采用多元统计的趋势面分析方法将滑坡面模拟成空间的一个曲面,求出曲面后则可计算滑坡推力、设计相应的加固方法,还可以通过滑动曲面计算滑坡的总方量。     

用丝束电极研究亚硝酸钠对低碳钢缝隙腐蚀的影响

在5％NaCl溶液和5％NaCl＋5％NaNO2溶液中，采用丝束电极技术测量了低砖、钢缝隙内、外的自腐蚀电位和电化学阻抗谱，研究了亚硝酸钠对低碳钢缝隙腐蚀的影响．结果表明，在5％NaCl溶液中，缝隙内的碳钢为阳极、缝隙外为阴极；随浸泡时间增加，腐蚀不均匀性增加．加入5％NaNO2后，缝隙内外的腐蚀电位都正移，电位差减小，碳钢的腐蚀速度显著降低．亚硝酸钠使碳钢表面形成致密氧化膜，有效抑制了碳钢的缝隙腐蚀．     

毒绳在辽宁省义县地区应用的初探

广泛大量地应用杀虫药物进行卫生害虫的防治,不仅耗费大量的人力财力,也造成了环境的污染,还可使害虫对杀虫药物的抗性逐年上升。为了探索如何充分地利用现有的药物,使其发挥更大的效力,提高其防治水平。节省用药量,延缓抗性的发展,减少药物对环境的污染有着重要的意义。为此本文根据实验浅谈了应用毒绳灭虫的效果。"     

热聚乙烯钢丝索在管道跨越工程中的应用

针对忠武输气管道跨越工程跨度大、管径大、荷载大的特点，对跨越主索的选择进行了分析和比较，比较结果表明，热聚乙烯钢丝索在弹性模量、防腐性能、施工工艺和工程投资等方面具有明显优势，适于忠武输气管道跨越作用，介绍了这种钢丝索在马水河、蚂蝗溪、木龙河和大溪沟跨越工程中的设计与应用，认为其应用经验可为其它管道跨越工程提供借鉴。     

新型水稻种绳捻制机捻绳机构的设计

水稻种绳捻制机就是在工厂内将水稻种子以精确的穴距和每穴粒数卷在20mm宽的纸带内并捻制成种绳,供大田播放。在前期研究的基础上,将捻制机的捻绳机构与卷绳机构分成独立工作的两部分,设计出一种新型的水稻种绳捻绳机构。该机构可提高机器的工作效率,保证种绳的捻劲个数,增强种绳的抗拉强度,降低种绳的漏种率,为制造出高质量的种绳奠定了基础。     

洪泽县主要作物施肥动态及对策

通过调查10年来洪泽县小麦、油菜和水稻3种主要作物的施肥动态，寻求提高3种作物生产水平的合理施肥结构和用量。     

新型内嵌式地线融冰电流计算

针对湖南电网研发的新型内嵌式地线地线新型直流融冰技术,提出地线直流融冰的所涉及的两个重要的参数（临界融冰电流和最大融冰电流）概念和计算方法。基于有限元法,以GJ-70电线为模型,建立3D热-电耦合仿真模型,仿真得出不同气候、温度条件下的临界融冰电流,以及地线正常运行所允许的最大电流,与试验人员得出的实验数据进行对比,进一步验证这种融冰技术的优越性,并为运行人员有效的融冰电流范围提供了参考依据。     

Long-term retention of coded wire tags in juvenile Arctic charr Salvelinus alpinus

Abstract  A hatchery experiment was organised to find out if the high loss rate of coded wire tags, noticed in connection with an Arctic charr Salvelinus alpinus (L.) restocking programme, was size-dependent and also to test head moulds for future taggings. Six moulds made by Northwest Marine Technology Inc. and five moulds made at the Finnish Game and Fisheries Research Institute were used. A total of 100 charr were tagged with standard-length coded wire tags using each mould. One-summer old charr at tagging were held for 534 days and two-summer old charr for 320 days. The tag loss rate varied between 0% and 54% and was negatively related to the size of the charr at tagging. The high loss rate was connected with the poor alignment of some moulds, such that a large proportion of the tags were located in the nasal cavity instead of the nasal cartilage. Testing of the moulds and careful grading of the fish for tagging is emphasised, especially if Arctic charr smaller than 20 g in weight are to be tagged.     

Mating disruption of the pink bollworm<Emphasis Type="Italic"> Pectinophora gossypiella</Emphasis> (Saund.) (Lepidoptera: Gelechiidae) using gossyplure PB-rope dispensers in cotton fields

The effects of mating disruption on population densities and percentage of damage of the pink bollworm Pectinophora gossypiella (Saunders) were investigated in a cotton field in central Greece, in 1992 and 1993. A 10-ha field was divided in two parts of 5 ha each. PB-rope dispensers were installed in mid-season in one part, whereas the other was used as a control field. Catches of pink bollworm moths in pheromone-baited traps and damage caused were recorded in both the treated and control fields. Results showed that moth catches were highly reduced in the treated field and, therefore, mid-season installation of dispensers was successful. Damage (%) was significantly less in the treated compared with the control field. Consequently, the field size of 5 ha seems to be adequate for the effective implementation of mating disruption.