Genetic and photoperiodic control of an avian reproductive cycle

European blackcaps,Sylvia atricapilla, with one breeding season per year, have a single-peaked annual testes cycle. However, African conspecifics from the Cape Verde Islands with two breeding seasons per annum demonstrate a two-peaked cycle. Both population-specific cycles reflect differences in the respective endogenous circannual rhythms. Experimental hybridization of birds of the two populations resulted in an intermediate pattern of testes cycle, thus demonstrating that there are genetic components for some temporal aspects in an avian reproductive cycle. Another characteristic of the African birds, their extremely rapid juvenile development and early sexual maturity (at an age of 5–6 months) proved largely to be a photoperiodic (short-day) effect in birds hatched in autumn. The same effect could also be induced in European conspecifics exposed to correspondingly short day-lengths.     

科技期刊表格通用无线表和横线表的研究

提出科技期刊的表格,通用无线表和横线表的表式进行表达的理论和实践.论述了通用表表式的特点和要求,表头单、复式项目的设计,横视型和竖视型项目头的审改,不同栏数正、反线的合理应用,表身的恰当用线和疏密排.介绍了通用表的合并、转栏、分段、跨页的正确编排方法,以及特殊用表的变通方案.可供撰文、审校、编辑、排版工作借鉴.     

快乐、广义消费与和谐社会模式的建构

快乐是人类经济社会发展惟一有惊天动地性的终极目的。而满足人类快乐需要的不仅是人类创造的国民财富，自然环境中的蓝天白云、青山绿水同样构成人类广义消费的基础内容，成为人类无上快乐的源泉。因此，广大科技工作者应确立科学发展观，在失去科学技术进步、实话国家重大工程与技术项目过程中，关注、构造人与自然和谐发展的经济社会模式。这对全面建设小康社会、实现人类快乐具有深远的意义。     

信息时代中小企业电子商务问题研究

主要阐述了电子商务环境下中小企业面临的机遇和挑战,分析了当前影响中小企业电子商务发展的主要障碍和困难,提出了信息时代中小企业电子商务发展的对策.     

内蒙古土默特旗科达穗及种子化石研究

对发现于内蒙古土默特旗上石炭统一下二叠统的几种科达穗化石及种子类化石进行了研究,经鉴定确认其中有2个为新种,分别定名为长爪科达穗Cordaitanthuslongibracteatussp.nov.和多泡石籽Car polithusmultibullatussp.nov..这些珍贵的繁殖器官的发现,表明晚石炭世一早二叠世种子演化已达相当水平,对于研究科达类的演化过程具有重要的研究价值.     

Monitoring the sandstorm during spring season 2002 and desertification in northern China using SSM/I data and Getis statistics

A massive sandstorm enveloped most part of northern China during the spring season 2002. Monitoring the evolution of sandstorm and desertification has become one of the most serious problems for China's environment. Since 1989, one of the most advanced and operational passive microwave sensors is the DMSP SSM/I (special sensor microwave imager) operated at seven channels (19, 37, 85 GHz with the vertical and horizontal polarization and 22 GHz with vertical polarization only). In this paper, the sandstorm and desertification indexes, SDI and DI, are derived from the radiative transfer equation, and are employed with multi-channel measurements of the DMSP SSM/I for monitoring the sandstorm and desertification in northern China. Some SSM/I data in 1997 and 2001 are employed. The algorithm of Getis statistics is developed to categorize the spatial correlation and its evolution these days. It is demonstrated that the SSM/I indexes, SDI and DI, and its Getis statistics are well applicable for monitoring the sandstorm and desertification.     

牢记“两个务必”，加强大学生艰苦奋斗精神的教育

艰苦奋斗是中华民族的传统美德，也是我们党在长期革命和建设中形成的优良传统和作风。针对目前相当一部分大学生艰苦奋斗观念淡薄这一现象，从引导大学生牢记“两个务必”的重要论述出发．就高校加强大学生艰苦奋斗精神教育的途径展开探讨。     

有分离调整和移走时间的两机器流水作业最大延误问题

在工件的调整时间和移走时间独立于加工时间的两机器流水作业问题中，同一工件的“调整”步及“移走”步在两台机器上可重叠进行，但“加工”步不能重叠，本以最大延误为目标函数讨论问题的解中工件排列应满足的条件，根据这些条件我们构作了两个近似算法。     

基于"涨落放大机制"原理的高技术产业化系统研究

“通过涨落达到有序”是自组织理论的基本原理。运用“涨落放大机制”理论的原理和方法，探讨了高技术产业化系统的内在规律性，提出了高技术产业化系统是一个正负反馈交错的复杂的动态系统，阐明了研究开发（R＆D）与技术创新涨落因素是高技术产业化系统向有序方向演进的内部诱因的观点，从而尝试为我国高技术产业化过程提供理论依据和指导。