外源乙烯和1-甲基环丙烯处理对采后胡萝卜品质的影响

以胡萝卜为试材,采用乙烯及乙烯受体抑制剂(1-甲基环丙烯)处理,通过对贮藏60d后胡萝卜的品质劣变率(长须根率、腐烂指数、出薹率)、外观指数、可溶性糖含量及多酚氧化酶活性进行测定,研究了1-MCP对胡萝卜采后贮藏品质的影响。结果表明:1-MCP结合手洗贮藏可抑制胡萝卜贮藏期间的品质劣变率、抑制可溶性糖含量的损失、保持较高的外观指数及抑制多酚氧化酶(PPO)活性。手洗后贮藏则可有效改善胡萝卜贮藏期间的表皮褐变问题。     

THE DEVELOPMENT OF COMPUTER AIDED NORM OF WORKING HOUR PLANNING SYSTEM

Based on Group Technology, part families of the norm of working hour are formed according to the similarity among components. With the progressive regerssion, the models of the norm of working hour are built for every part family. A computer aided norm model building program and a computer aided norm of working hour planning system are developed. The system is successfully integrated with CAD/CAPP system. Some examples of the model building and calculation results are illustrated as well.     

Developing Method Based on Object-oriented Modeling Techniques for Management Information System

A developing method is given which based on object-oriented modeling techniques for management information systems.The modeling techniques,especially,from CDM to PDM conversion,make it possible that the method can be used for developing such management information systems which based on relational database.The result shows that it can raise the efficency of the system developing,improve the system tability,enhance the system maintenability.     

The Application of Pre-splitting Blasting to Excavation on High Slope in Soft Rock Section

Based on analyzing about blasting mode of slope in the construction of road, the paper shows that pre splitting blasting is mostly suitable in the section of severely weathering soft rock with developed joints and fractures, introduced the laying out about the hole of pre splitting blasting that can apply in the high slope of the expressway in the section, and designed the parameter. The practice shows that it gained favourable effect by this method.     

A Receiving Surface of Perturbative Photon Fluxes in Interaction Between Gravitational Waves and EM Fields

According to Electrodynamics in curved spacetime, the interaction between gravitational waves (GW) and electromagnetic (EM) fields will produce perturbative electromagnetic fields. In a special EM system, namely, a Gaussian beam (Gb) propagating through a static magnetic field, the photon flux along the direction of the electric field of the Gb will be only a pure perturbative photon flux,when a GW propagates along the symmetric axis of a Gaussian beam. Detailed alanysis and calculation of the photon flux along several typical surfaces are performed, and a possible optimum plane which can receive perturbative photons up to 10~4s~(-1) is proposed. It is possible to provide an important method to detection of GW.     

神舟3号飞船搭载的树莓试管苗超微结构及其RAPD分析

已有研究表明,植物进入太空后,其生长、发育、细胞组织结构以及基因组均发生不同程度的变化.例如,大豆[1]及三叶草[2]受空间微重力的影响使其生长明显加快,许多植物的形态及细胞学行为也受太空环境影响[3～10];另外,空间微重力可以改变植物基因表达水平[11～14],半胱氨酸等放射性保护剂的应用进一步证实太空射线可损伤植物染色体[15].但目前有关太空习行对植物试管苗亚细胞超微结构及其基因组影响的报道较少.本文对神舟3号飞船搭载并成功回收的树莓试管苗进行了细胞亚显微结构及RAPD分子标记的初步分析.     

人工合成甘蓝型油菜高频率再生研究初报

资源材料保存在作物遗传资源的研究与利用中起到非常重要的作用。该实验以不同来源的人工合成甘蓝型油菜KH106，KH109，KH111D为材料，以花序轴，子房，果柄为外植体研究其再生情况，结果表明，由芥蓝和小白菜人工合成的甘蓝型油菜KH106的再生频率极显著高于由羽衣甘蓝和白菜型油菜人工合成的甘蓝型油菜KH109和KH111；与花序轴和子房为外植体再生频率相比，以果柄为外植体平均再生频率最高，差异达到极显著水平；利用不同预处理培养基处理不同时间，结果显示不经过预处理直接接种到分化培养基上再生频率最高。     

小麦异源细胞质对主要病害抗性影响的初步研究

在大田自然发病和人工诱发条件下,研究了小麦异源细胞质对条锈、叶锈、秆锈、白粉和赤霉5种主要小麦病害抗性的影响。结果表明在同核条件下,不同异源细胞质对同一病害抗(感)性的影响不同,同一种细胞质对不同病害抗(感)性的影响也不完全相同;并且在不同地区试验的结果有时也有差异。根据初步研究结果,无芒山羊草、拟斯卑尔脱山