评定矿体变化性的两个新指标

以复合变量为基础,提出了评定矿体变化性的两个新指标,即总体随机变化系数和局部随机变化系数,它们的大小分别反映了矿体标志总体随机性变化的大小和围绕总体趋势变化局部起伏的大小。文章最后,根据这两个指标对矿体的变化性质作了初步分类。     

Monsoonal oscillation revealed by the upper-troposphere water vapor band brightness temperature

The measurements of brightness temperature (BT) from the upper-troposphere water vapor channel 12 of the National Oceanic and Atmospheric Administration polar satellites from 1979 through 1995 are used to analyze the interannual variations of the global monsoon strength. Results show that in the interannual time-sclae the BT variability in the equatorial eastern Pacific (EEP) is out of phase with the BT variabilities in other four regions, i. e. South Asia, tropical south American, two subtropical areas in the South and North Pacific. The BT interannual variation mode may be called monsoonal oscillation (MO). The MO is the result of the atmospheric circulation anomaly in the troposphere.     

生长的元——廉租房设计的一种方式

通过对廉租房普适性的研究分析,对贵州省2010年"廉租住房、棚户区改造项目户型设计竞赛"获奖方案"生长的元"的理念介绍,唤起大众对低收入人群的关注,并探讨在受到客观条件制约的状态下,建筑师如何理性地给出一个高品质的答案。     

入侵种喜旱莲子草对土壤水分的表型可塑性反应

研究了水生、湿生、中生和旱生生境条件下外来入侵种喜旱莲子草(Alternanthera philoxeroides(Mart．)Griseb．)表型可塑性反应．结果表明：喜旱莲子草株长、茎节长度、总生物量积累在湿生和中生生境中最大;随土壤含水量减少,喜旱莲子草根冠比显著升高,分枝强度显著降低;土壤含水量与喜旱莲子草根系生物量投资呈显著负相关,茎、叶生物量投资随土壤含水量的减少而下降．研究结果表明,喜旱莲子草的最适宜水分生态位是湿生生境,在不同水分条件下,其不同表型结构有可能同时对环境选择作出反应,在种群生存与维持、生长、繁殖等功能方面实现种群个体各器官生物量投资的优化配置来适应多样化的环境．     

Skeletal morphogenesis and growth check lines in the Antarctic bryozoan Melicerita obliqua

Skeletal morphology and colony growth pattern of the Antarctic bryozoan Melicerita obliqua from the eastern Weddell Sea, on the Weddell Sea shelf, have been investigated in order to test the hypothesis of a relationship between growth banding and the seasonal variability of the high Antarctic environment. Melicerita obliqua is a common endemic species on Antarctic shelves. The colonies are bifoliate-flattened and sabre-shaped, and are anchored with organic rootlets in the sediment. The most significant feature of the skeletal morphology is the segmentation of the colony caused by the formation of annual growth check lines. Formation of check lines occurs as a combination of thickened walls in the proximal part of the nodal autozooid and an oblong, thin-walled distal part. Both are separated by a back-fold of the frontal cryptocyst resulting in a narrow slit on the cryptocyst. Changes in the length of autozooids and segments indicate seasonal and inter-annual variations in the environmental factors. Within a segment, nodal autozooids are longest, whereas autozooids immediately proximal to the next node are shortest. The length of segments varies within a single colony but shows a slight decrease with colony age. Melicerita obliqua displays a slightly decreasing growth rate with increasing age, hinting at a limited life span fixed in the genetic programme. Individual colonies of M. obliqua reveal a maximum age of about 45 years. Seasonal growth patterns in the colony are expressed in segment formation with nodes and internodes, differences in autozooid length, and polypide degeneration/regeneration cycles. Sizes of segments within colonies are used to calculate colony growth rate. Variations in colony growth rate calculated from length increment of segments depict a pattern of longer and shorter segments indicating phytoplankton variability between the years.     

Seasonality and abundance of Metamasius callizona (Coleoptera: Dryophthoridae), an invasive insect herbivore,on two species of Tillandsia (Bromeliaceae) in Florida

Seasonality and abundance of an insect herbivore population are regulated by a complex array of forces from the bottom up, from the top down, and from competition and the environment. This paper examines the effect that two host plants have on an insect herbivore in the absence of top‐down regulation or competition. Metamasius callizona is an invasive bromeliad‐eating weevil in south Florida that has escaped its natural parasitoid in its home range. A 4‐year field study shows the weevil to be present and active year‐round, but to exhibit different patterns of seasonality and abundance on two of its host plants. It is argued that this demographic variability is generated by the differences in leaf type and growth habit that exist between the two host plants.     

基于等概率粗粒化的复杂度算法及其应用

为探究Lempel-Ziv复杂度(LZC)在心率变异(HRV)分析中的稳定性,提出了等概率粗粒化重构出符号序列计算LZC的新方法和具体算法.以年轻(21-34岁)与年老(68-85岁)组健康受试者的HRV信号为实验数据,选取不同的粗粒化段数,用常规和等概率方法分别计算LZC.再算出不同分段数LZC序列之间的相关系数.结果表明, 用新方法得出的相关系数都大于0.96,年老组的LZC指标明显降低(P<0.001),这些结果不受粗粒化段数的影响.新方法算得的LZC是度量HRV稳定而有效的指标.     

基于经验模态分解建模法检测肌肉疲劳研究

本文针对表面肌电信号的非平稳特性,采用自回归模型（auto regression,AR）对表面肌电信号进行分析,对短时间内的表面肌电信号的肌肉疲劳迅速做出判定。首先对表面肌电信号进行经验模态分解,得到本征模态函数和趋势项,然后对趋势项进行零化处理,再对本征模态函数分量进行重构处理,重构后的信号可视为均值为零的平稳信号,最后将去势化的信号进行建立自回归模型,采用基于该模型的第一个时变参数（first time-varying parameter of auto regression modle,ARC1）作为检测肌肉疲劳灵敏度的快速指标。用疲劳前后的相关特征值的灵敏度波动比（sensitivity to variability ratio,SVR）来表征肌肉疲劳的灵敏度,较平均功率频率对疲劳反应灵敏度要高。该方法通过表面肌电信号对肌肉疲劳检测时,具有时间短、灵敏度高和将表面肌电信号细微特征信息放大、便于识别的效果等优点。     

基于HRV频域分析的草原公路减速带设置研究

通过实驾试验采集驾驶员的心电信号,利用心率变异频域分析方法,分析了试验过程中经过不同数量减速带驾驶员的LF成分与HF成分能量的比值(LF/HF)、归一化的高频(HFnorm)两个指标值的变化规律。结果表明:在排除速度和会车等因素影响的情况下,草原公路上减速带的设置缓解了高驾龄驾驶员的紧张情绪,增加了低驾龄驾驶员的警惕性;并建议设置2个减速带较为合理。