弱智儿童常见食物的概念联系类型

采用自由分类法，以实龄相同的智力正常儿童为参照，考察低、中、高年级弱智儿童常见食物的概念联系类型。结果表明，弱智儿童的概念水平随着年龄增长而提高，概念联系类型由以SF联系为主向以分类学关系为主转交，概念发展趋势与正常儿童相同，但在时间和水平上却大大落后于智力正常儿童。教育与环境在弱智儿童的概念发展中起重要作用。     

中美关系走向:利益与共识的融合

中美关系已经走过200余年的风雨历程.尽管两国间的不平等状况是历史存在,两国间的碰撞与摩擦也是客观现象,但是新的共同利益纽带正日益将两国拉近,中美两国在新的世纪里将迎来新的未来.     

云南省人口城镇化与产业非农化协调关系的实证分析

文章基于协调的含义，把人口城镇化与产业非农化的协调发展解读为两者的同趋性、互动性、协调性，并通过聚类分析、VAR模型、协调度C模型和协调发展系数D模型，在实证层面对这三个特性进行解读，我们得出：云南省人口城镇化与产业非农化的发展虽然表现出高度的相关性，但是两者在空间维度上并未实现同趋分布；再次二者的互动作用不明显，尤其表现在人口城镇化对产业非农化的发展促进作用不明显；最后我们从时间和空间维度观测云南省人口城镇化与产业非农化的协调度问题：16州市中除昆明外，其余15州市均表现出不协调的特性。这些研究结论将为推进云南地区人口城镇化与产业非农化的协调发展提供相应的理论支撑和参考。     

归因方式性别差异与日语语法学习效果研究

归因是影响语言学习成败的因素之一.文章以作者所在高校79名日语专业大二学生为研究对象,通过问卷和访谈的形式对归因方式的性别差异与日语语法学习效果的关系进行调查研究.结果表明,男女生的归因方式差异显著,与日语语法学习效果之间存在显著相关关系.鉴于此,教师对学生进行归因训练将扭转消极归因为积极归因.     

教学过程应处理好的几个关系

结合个人的课堂教学实践，从四个方面阐述了教学过程中应正确处理好的几个关系，对于工科课堂教学有着较好的指导意义。     

第一次世界大战与30年代大危机

本从三个方面论述了一战和３０年代大危机之间的关系：１、一战破坏了战前资本主义世界金本位制，战后虽恢复了金本位制，但极不稳定，３０年代大危机是战后国际经济失调的结果；２、一战冲击了世界贸易格局和贸易体系，促使资本主义世界生产的恢复与发展同国际贸易增长有限的矛盾日益突出，加剧了资本说义世界生产过剩；３、一战加速了战后资本主义世界经济、政治等不平衡发展，增加了战后世界经济不稳定因素，埋下了大危机的种子     

Paternal allocation of sequestered plant pyrrolizidine alkaloid to eggs in the danaine butterfly,Danaus gilippus

Summary Pyrrolizidine alkaloid sequestered by adult maleDanaus gilippus from plants is transferred in large measure to the female at mating, and by the female to the eggs. The eggs, presumably, are protected as a result. The male's courtship pheromone, danaidone, derived from the sequestered alkaloid, may function to advertise the male's alkaloid-donating capacity.Acknowledgments. Paper Nr. 89 of the series Defense Mechanisms of Arthropods. Study supported by NIH (Grants AI-02908 and AI-12020; Predoctoral Traineeship to DED), Hatch funds (191-7416), the Bache Fund (National Academy of Sciences, to DED), and the Theodore Roosevelt Memorial Fund (American Museum of Natural History, to DED). We thank M. Weingarner and J. Miller forD. gilippus collection, J. Boggan for technical assistance, and the staff of the Archbold Biological Station, Lake Placid, Florida, for assistance and hospitality. One of us (DED) is indebted to M. D. Achey, who by demonstrating nuptial cardenolide transfer in the monarch butterfly [Honors Thesis, Amherst College, Amherst, Massachusetts (1979)] raised the possibility that other plant metabolites might be similarly transferred in danaines.Deceased July, 1985. This paper is affectionately dedicated to his memory.     

No sex difference in the waveform of the pulse type electric fish,Gnathonemus petersii (Mormyridae)

Summary A communication signal in an African freshwater electric fish, its pulse-like Electric Organ Discharge (EOD), was investigated in order to determine whether inter- or intraindividual variability of the EOD waveform provides a putative cue for communication, in addition to the electric cues already identified. In contrast to an individual's highly stereotyped EODs showing extremely low variation (fig. 1), variability between individuals was considerable (fig. 2). The dependence of an individual's EOD duration on temperature was weak with a Q₁₀ of close to 1.5. In none of four quantitative EOD waveform measures can a sexual dimorphism be discerned (table).Gnathonemus petersii very likely relies on mechanisms other than discrimination of intraspecific EOD waveforms for mate recognition.     

两个Lagrange经典关系

明确两个Lagrange 经典关系的含义,对分析动力学的研究意义重大.应用坐标变换法和矢量投影法研究了两个Lagrange 经典关系,表明两个Lagrange 经典关系的含义之一是含时的坐标变换,并用复变函数法加以辅证.