Photoautotrophic Growth and Net Photosynthetic Rate of Sweet Potato Plantlets In Vitro as Affected by the Number of Air Exchanges of the Vessel and Type of Supporting Material

Introduction Micropropagation, a plant tissue culture technique, has contributed to producing virus-free, genetically supe-rior plantlets. However, its commercial application is still limited due to its relatively high production costs. The high costs are…     

基于分形接触的湿度对静摩擦因数影响分析

采用分形接触模型推导并计算了由水膜的弯月面效应引起的附加静摩擦力,得到了由水膜的弯月面效应引起的附加静摩擦力的表达式,表明随着分形维数D的增大和分形粗糙度G的减小,计算的附加静摩擦系数增大,同时随着相对湿度的增加,水膜厚度增加,附加的静摩擦系数增加.     

用FoxPro编程建立湿空气状态参数表

目前在空调专业各种教材及设计手册中,有关湿空气的各项状态参数,都是以“焓湿图”的形式给出,查看时既不方便又不精确。本运用FoxPro编程方法,将“焓湿图”变换成“湿空气状态参数表”。     

栖息地与种群灭绝的生态系统耦合模型的近似解

研究了一类栖息地与种群生态环境问题,描述了动力学模型.利用广义泛函-变分迭代理论和方法,得到了相应模型的近似解,从而可以进一步进行预测和控制.     

酸性条件下合成介孔氧化硅的孔结构及其调湿性能

以十六烷基三甲基溴化铵作模板剂,采用酸性常温法制备介孔氧化硅材料SH,通过添加TMB扩孔剂对其进行改性得到SH TMB,分别测试其吸湿、放湿性能,并采用小角度XRD、TEM、B.E.T.等测试手段研究其孔结构、比表面积和孔径分布等,分析微观形貌与其调湿性能之间的关系。结果表明:酸性条件下合成的介孔氧化硅SH有着很好的吸湿放湿性能,并且添加TMB后其湿度调节能力增大。     

鄂东大别山生物多样性研究

对鄂东大别山区的生物多样性进行了研究.目前已知该区有维管植物195科663属1 461种,占湖北省总种数的24.27%和全国总种数的5.25%,属国家特有、珍稀濒危或重点保护的植物有34种,有苔藓植物30科64属143种.已知该区有陆生脊椎动物26目65科208种,占湖北省总种数的31.04%和全国总种数的8.09%,其中有27种国家重点保护野生动物和61种湖北省级重点保护动物.该区自然植被类型有10个植被型,52个群系.该区不仅动植物区系成分多样性复杂,而且经济类型多样.     

淮北地区土壤墒情动态预测

利用与土壤墒情密切相关的气象因子,逐步回归分析1981—2003年土壤墒情变化与气象因子之间的关系,建立安徽省淮北地区各季节土壤墒情的预报模型;结果表明利用时间连续性较好的5个站点的土壤湿度、降水量、日照3个因子建立的预报模型,经检验可以应用到整个淮北地区,春夏秋冬各季节平均预报精度分别为88.92%、91.35%、91.96%、92.94%。     

Meteorological observations on Mount Everest in 2005

Mount Everest,the highest point on the Earth is often referred to as the earth's third pole as such the place is relatively inaccessible and little is known about its meteorology.In April 2005,an automatic weather station was installed at the mountain's North Col(6523 m a.s.l.).According to the observational 10-minute mean and daily records,the meteorological characteristics were analyzed. All the meteorological elements displayed obvious diurnal variations during May 1 to July 22,2005.The monthly variation of daily meteo- rological elements on Mount Everest coincided with that on Dingri,the closest routine meteorological station,with the high correlation co- efficients of 0.928,0.877,0.682,0.755,0.826 and 0.676(n=83,p<0.001)for mean temperature,minimum temperature,max- imum temperature,relative humidity,pressure and wind speed,respectively.Furthermore,the vertical mean gradient of temperature was above 0.6℃/100 m,especially for the daily maximum temperature.Most weather events on Mount Everest prominently appeared on the same day as those on Dingri,especially those from daily mean pressure,temperature and relative humidity with the cross-correlation coeffi- cients of 0.673,0.485 and 0.487(n=83,p<0.001),respectively.Some other weather events on Mount Everest lagged one-day be- hind those on Dingri.Furthermore,forecasting of the weather events on Mount Everest from pressure on Dingri was more reliable than those from the other meteorological elements.The conclusions are much important for research on meteorology and climate changes in the region.     

Reproductive behaviour of Physalaemus kroyeri (Anura: Leiuperidae) in the municipality of Jequié, state of Bahia

From August 2010 to April 2011 we surveyed two different areas, located in the municipality of Jequié, State of Bahia, to obtain information about the reproductive biology of Physalaemus kroyeri. Data on the spatial and temporal distribution of P. kroyeri were recorded. Physalaemus kroyeri may be classified as a prolonged breeder with a reproductive period linked to rainfall. The average number of eggs in the foam nest of P. kroyeri is one of the highest recorded for the genus. Our results are coincident with the known reproductive behaviour of congeneric species and may be viewed as reproductive adaptations to open and highly seasonal environments.     

基于ZigBee的无线温湿度采集系统设计

基于ZigBee技术设计了一套无线温湿度采集系统.将该系统部署到环境中，节点自发组网通信，终端采集节点可将环境的温湿度数据发送给协调器汇聚，再通过串口发送给上位机实时显示；协调器搭配联网模块可以连接云平台，客户端小程序订阅相关主题后也可以接收到协调器上报的数据，并查看到数据的变化趋势.该系统不仅能应用于家庭环境监测，还可以应用于工农业生产中.