从美国社区学院看我国高等职业技术教育的改革方向

美国创建和发展社区学院的成功经验 ,加上政府多种方式的助学计划 ,为全美快速从精英高等教育走向大众高等教育 ,并继而向普及高等教育发展推进 ,发挥了重要作用。学习国际职业技术教育的先进经验 ,从而能以发展的眼光来思考我国的职业技术教育 ,从更深层次上思考职业技术学院的教育教学改革     

FORTRAN—77结构化程序设计中有关开关变量的问题

本文介绍了开关变量在结构化程序设计中的作用,并介绍了如何利用开关变量来实现程序结构化的。     

论高师体育专业学生能力的培养

高师体育专业要正确认识和培养学生的自信力，观察，分析，创造能力和组织能力，管理能力，不断改进，更新教学方法，提高教学质量，为培养合格的体育教师而努力奋斗。     

烟酰胺合硝酸钕的合成及晶体结构

合成了烟酰胺合硝酸钕的络合物。用四园衍射仪测定了它的晶体结构,用MoKa辐射收集了4008个独立衍射点,其中2597个可观察点参加了结构修正,最终偏差因子R=0.042。结果表明晶体属P2_(1/a)空间群。晶体学数据:a=7.447(1)(?),b=30.926(5)(?),c=9.152(2)(?);β=95.27°,Z=4。钕原子的配位数为10,其中2个氧来自水分子,平均Nd-O键长2.493(?);2个氧原子来自烟酰胺,平均Nd-O键长2.418(?),其余6个氧原子分别来自3个硝酸根,平均键长2.597(?)。配位多面体为一变形的双盖四方反棱柱,对络合物的红外光谱及热谱也进行了研究。     

PN-流形上的Dirac结构

讨论PN 流形上的李代数胚和李双代数胚 ,以及PN 流形上的Dirac结构     

土壤侵蚀造成徐连山丘区农业环境恶化及其逆转途径

长期的土壤侵蚀使徐连山丘区农业环境不断恶化:土层变薄、肥力降低、砂砾增多、裸岩面积扩大和旱涝灾害加剧。防治的基本对策应为:在山丘区经济建设中加强水土保持工作,加强以坡改梯为中心的农田基本建设,加速植被覆盖并进而加强耕作管理。     

Accountability and values in radically collaborative research

This paper discusses a crisis of accountability that arises when scientific collaborations are massively epistemically distributed. We argue that social models of epistemic collaboration, which are social analogs to what Patrick Suppes called a “model of the experiment,” must play a role in creating accountability in these contexts. We also argue that these social models must accommodate the fact that the various agents in a collaborative project often have ineliminable, messy, and conflicting interests and values; any story about accountability in a massively distributed collaboration must therefore involve models of such interests and values and their methodological and epistemic effects.     

Population dynamics,age structure and sex ratio of the bromeliad-dwelling jumping spider,Psecas chapoda (Salticidae)

In this study, the population fluctuations, phenology and sex ratio of the bromeliad-dwelling jumping spider Psecas chapoda were investigated in an area of semi-deciduous forest in south-eastern Brazil. Psecas chapoda occurred and reproduced on Bromelia balansae (Bromeliaceae) throughout the year. The number of egg sacs increased at the beginning of the rainy season (September to December), but the population size and phenology were stable over time and correlated weakly with rainfall and temperature. The principal factor affecting the dynamics of P. chapoda was the blooming of B. balansae, which expelled spiders because of the drastic change in plant architecture. Male spiders were more frequent than females during the juvenile phase, whereas females were more frequent than males during the subadult and adult phases, suggesting a sex ratio that favoured males. The biotic and abiotic factors that influence the population dynamics and sex-dependent vulnerability determination are discussed.     

钛-氨三乙酸配合物的合成与结构表征

利用溶液法合成了Na4[Ti4O4（nta）4].12H2O配合物,同时对该配合物进行红外光谱和X-衍射表征,结果表明：该配合物为三斜晶系,空间群为P-1,a=9.8062（17）,b=11.937（2）,c=12.059（2）,V=1200.8（4）3,Z=4.     

侗族村寨聚居空间演变特征分析——以贵州黎平高寅侗寨为例

以贵州省黔东南州黎平县九潮镇高寅侗寨为典型案例,从农户宅基地利用视角,对侗族村寨用地规模及其内部特征、空间演变过程及其形态特征进行研究.研究结果表明,1990年以来高寅侗寨宅基地扩张面积占总面积的比例达到70%以上,户均宅基地面积维持在170m2左右,高寅侗寨宅基地扩张具有加速蔓延趋势且新修房屋正逐步放弃传统木瓦结构,偏好砖混结构;农户宅基地的居住功能在不断加强,而生产功能(主要是圈舍养殖等)正逐步趋于弱化,内部结构正趋于简单化、集约化;近三十多年高寅侗寨用地存在着先沿"歌堂"内向"填充",后向"风雨桥"外向扩展的演变过程,体现了侗族村民依山傍水的建房理念.