真空化学热处理多用炉的研究

A new type of versatile vacuum electric furnace for chemical heat treatment is developed, in which the low vacuum structure heating outside, the NH_3 auto-disintegrating instrument, the technology of ultra-red heating, TTL automation and the diverse distr     

负刚度的工作原理及应用初探

This paper deals with the vibration isolation principle of a system with a negative stiffness spring and the energy analysis for this system.As an application of the method, an example of vibration systems with equal frequencies is given. It shows that th     

花生区组间杂种二代性状鉴定

花生区组四粒红与根茎区组Arachis glabrata杂交果针经离体培养克服了不亲和性,获得杂种。杂种二代性状出现疯狂分离,但有些性状仍分别倾向双亲。经叶片过氧化物同工酶分析,酶带的条数、宽窄、活性强弱及迁移率,杂种与双亲有明显差异,也有共同之处,初步证明了杂种的真实性。     

汽提污水中有机物的GC／MS分析

应用了ＧＣ／ＭＳ方法分析炼油厂汽提污水中的有机物，其结果可作为实用除油技术的依据。     

广义连续格的结构

以上（下）子格为工具建立广义连续格的诸结构定理，它们奠定这些格的完全链表现的基础。     

墨绿色苦瓜新品种翠玉的选育

翠玉是以自交系0123为母本,0219为父本配制成的苦瓜一代杂种.中早熟,果实长棒形,纵径30～35 cm,横径10～13 cm,瓜肉厚1.0～1.5 cm,单瓜质量500～700g,产量2 500～3000kg·(667 m2)-1,皮墨绿色,大刺瘤,对白粉病和枯萎病的抗性强于对照翠妃,适宜南方春秋种植.     

Radiation Balance Components of Maize Hybrids Grown at Various Plant Densities

Components of the energy and heat balances were examined in two maize hybrids grown at three different plant densities (40, 70 and 100 thousand plants per hectare). One of the hybrids was drought tolerant, while the other was bred for cultivation under irrigated conditions. An increase in plant density influenced not only the size of the leaf area, but also the distribution of the leaves at various plant heights. The extinction coefficient, which provides a quantification of radiation penetration, was higher in the irrigated treatments. By contrast to the other two treatments, the plant canopy in the thinly sown stands remained open throughout the vegetation period, and thus behaved quite differently to the closed stands, making it impossible to compare them. Smaller albedo values were recorded for the hybrid bred for irrigation and in thinly sown stands. The low plant density allowed more energy to reach the soil, from which it was reflected, making a considerable contribution to the final temperature in the stand. The latent heat, in keeping with the quantity of water transpired, was the greatest in the densely sown stands. There was little difference between the latent heat values of the normal and dense stands in either hybrid, indicating that they both had a similar sensitivity to increased stand density. If sufficient water is available it would appear that the stand density could be increased even for the drought-tolerant hybrid.     

提高中锰白口铸铁韧性的研究

为改善中锰白口铸铁的韧性以扩大其应用范围,本文探讨了C, Si, Mn等合金元素、变质处理和热处理工艺对中Mn白口铸铁组织和性能的影响.     

大白菜新品种中熟6号的选育

中熟 6号是由大白菜雄性不育系 98- 2 - 1和从丰抗 70中多代自交分离而选育出的自交系F - 3-2 - 3配制而成的优良一代杂种。抗霜霉病、病毒病与软腐病 ,生长期 6 0～ 6 5d(天 ) ,叶球叠抱、圆头、卵圆形。南方栽培平均单球质量 2 .0kg ,每 6 6 7m2 产量 4 0 0 0～ 5 0 0 0kg。     

水稻籼粳核质核杂种研究初探

籼质粳核核质杂种配普通籼稻,粳质籼核核质杂种配普通粳稻,以及这两种核质杂种互交F1,称之为核质核杂种.研究表明,核质核杂种既保持了或基本保持了籼粳稻亚种间的杂种优势水平,又克服了籼粳稻亚种间不亲和的问题、植株超高问题和不能正常抽穗等问题.探索了一条亚种间杂种优势利用的新途径.