昆虫行为学的研究与展望

论述了昆虫行为学不同分支学科的发展概况和研究现状,主要包括昆虫取食行为、昆虫生殖行 为、昆虫通讯行为、昆虫防御行为。并对昆虫行为学的发展方向进行了展望。     

《动物行为学》课程教学探讨

动物行为学是生物学的一支新兴分支学科。本文就动物行为学教学的基本内容和体系、教学方法和教学过程进行了探讨。     

用线性算子刻画迭代内插空间

用 K方法构造迭代内插空间 ,并用线性算子对其逼近性质进行刻画。其结果可以应用到许多具体线性算子上去。     

Solid-state chemistry: a a rediscovered chemical frontier

Chemical bonding in solids is not completely understood, mainly because of the wide variation in the chemical properties of the elements. Many difficult challenges remain in predicting the composition, structure, and the properties of new materials. Consequently, the synthesis of novel solids is as much an art as a science. Discoveries of new compounds and structure types highlight the versatility that nature has allowed with the relatively small number of elements. This article explores the long-term challenges in solid-state chemistry and then focuses on efforts at Cornell to prepare new solids.     

Methanol as a gasoline extender: a critique

The tests conducted with the three vehicles at different emission control levels suggest that, in the area of fuel economy and emissions, potential benefits with methanol blends are related to carburetion and are only significant in the case of the rich-operating cars built before emission control standards were imposed. Theoretical considerations related to methanol's leaning effect on carburetion support this conclusion. Potential advantages for methanol in these areas are therefore continuously diminishing as the older cars leave the roads. At present, these older cars use only about one-fourth of the totalc motor gasoline consumed and, before methanol could be used on a large scale, this fraction would be much smaller. The use of methanol in gasoline would almost certainly create severe product quality problems. Water contamination could lead to phase separation in the distribution system and possibly in the car tank as well, and this would require additional investment in fuel handling and blending equipment. Excess fuel volatility in hot weather may also have adverse effects on car performance if the methanol blends include typical concentrations of butanes and pentanes. Removal of these light hydrocarbon components would detract from methanol's role as a gasoline extender and if current fuel volatility specifications were maintained, its use could lead to a net loss in the total available energy for use in motor fuels. Car performance problems associated with excessively lean operation would also be expected in the case of a significant proportion of late-model cars which are adjusted to operate on lean fuel-air mixtures. If methanol does become available in large quantities, these factors suggest that it would be more practical to use it for purposes other than those related to the extending of motor gasoline, such as for gas turbines used for electric power generation. In this case, the "pure" methanol would act as a cleanburning fuel, having none of the potentially severe product quality problems associated with its use in motor gasoline, while the fuel oil or natural gas cLirrently burned in these tuLrbines CotLild be diverted to other ulses.     

探索灰色文献

在概述了灰色文献的起源、内涵、外延及其他特征的基础上，对各国学者对灰色文献的研究进行了比较分析，对灰色文献的自身价值和社会作用进行了分析评价。