柳杉扦插繁殖试验初报

采用正交试验设计分析了母树年龄、采穗部位、扦插基质、扦插时间、激素处理对柳杉扦插成活率的影响，结果表明：母树树龄和扦插时间是影响扦插成活的主要因素，扦插基质、采穗部位、激素处理对扦插成活无显著影响。     

高效预应力混凝土框架的试验研究

通过２榀预应力混凝土叠合框架１：３比例的模型试验，了解了叠合梁框架在竖向荷载作用下的受力性能。讨论了叠合梁截面应变分布特点，并分析了梁的配筋率这一主要参数对框架极限承载力和破坏形态的影响。     

机械化奶站真空系统的设计

阐述了机械化奶站真空系统的组成、真空泵的工作原理、真空系统设计中应遵循的原则及设计过程中的注意事项,提出了设计机械化挤奶站真空系统的方法。     

浅谈采暖工程设计中的几个问题

针对采暖设计中的一些问题，提倡以自然科学理论指导采暖设计和设计上的创新，建议采暖设计规范化。     

罐顶对罐壁应力的影响

在大型油罐设计中采用线性理论的方法,分析论述了罐顶对罐壁是否产生影响这一问题。通过对拱顶油罐、浮顶油罐的罐壁边界条件、罐顶边界条件的分析计算,求出各层壁板挠度方程中的待定系数,便可得出其应力。从线性方程中,可看出影响罐壁应力的主要因素是挠度方程中的待定系数。待定系数除受储罐尺寸、液位高度的影响外,还受罐顶重量、罐顶剪力和弯矩的影响。以10万m~3浮顶油罐和拱顶油罐为例,进一步证明,液位是罐壁应力的控制因素,而罐顶重量、罐顶剪力和弯矩对罐壁应力的影响可以忽略不计。     

Yield Stability of Winter Wheat (Triticum sp.) Cultivars and Lines

The purpose of this study was to compare responsiveness to environment as well as the stability of newly developed promising lines with traditional commercial cultivars. Subject research was conducted in Ankara between 1983-1989 on common and durum wheat cultivars and lines. Regression coefficient (b) was used as the criterion of genotypes' responsiveness to environment whereas deviation from regression (S²d) and coefficient of determination (r²) were used as stability parameters. Each experiment year was regarded as an environment and yield average of each year was used as the environmental index.
In consequence of the research, it was determined that new varieties with high yield, adaptable to diverse environments could be developed by means of hybridizations between parents having different genetic characteristics which were provided from diverse ecological regions.     

步进电机扭矩测量试验台系统的设计

专用电机扭矩测量仪器精度高，但价格昂贵，操作复杂，长时间使用会出现误差。步进电机扭矩测量试验台系统采用单相交流电机作负载，使用标准扭矩仪对该系统进行标定来对待测调速电机进行扭矩测量。为此，介绍了一种电机扭矩测量系统的构成与工作原理。该系统以单片机为核心，组成扭矩测量与显示系统，可以较好地实现电机扭矩在线测量，具有较好的经济效益。     

Seed survival and predation of Anoda cristata in soyabean crops

Anoda cristata is a troublesome annual broad-leaved weed in summer crops in the rolling Pampa in Argentina; seeds are the only source of regeneration of this species. Seed persistence or depletion is the result of survival and loss processes, including predation. The objective of this study was to determine survival at two burial depths in undisturbed soil and predation rates of A. cristata seeds in soyabean crops in different rotations and tillage systems. Survival was discontinuous and decreased to 25% after 35 months, after which no further reduction in survival was observed to the end of the experiment at 96 months. No differences in seed survival between seeds placed on the soil surface and buried 5 cm below the soil surface were found at 80 months, but at later times survival was lower for seeds placed on the soil surface. Predation rates ranged between 0.3% day⁻¹ and 6.7% day⁻¹. Of the models tested, a polynomial regression of the rate of predation with time gave the best representation of seed predation. From January to July, predation was higher in non-tillage plots in the wheat/soyabean rotation. There was no significant difference in predation rates between tillage systems in the soyabean monoculture and no difference between planting densities. Higher crop residue levels in non-tillage plots in the wheat/soyabean rotation was the dominant factor influencing seed predation, probably because such habitat favours the presence of seed predators.     

基于网络技术的电力系统通信及调度方案设计

电力网络传输距离长、覆盖面广，利用电力网络实现通信和控制具有很大的发展潜力。为此,介绍了网络技术的发展及特点，并结合电力系统自身的优势，对电力系统通信方案进行了设计。     

1QJ-120型浅松机的研究设计

针对旧式浅松机表土作业中秸秆和土壤侧向位移问题,分析和优化了浅松机的技术参数,设计了一种新型的1QJ-120型浅松机。该机适用于旱作保护性耕作播前作业,能够达到除草、整地和提高地温等目的,也可以用于中耕除草作业。