Temporal and spatial variabilities of sea surface heights in the northeastern South China Sea

Analyses of sea surface height anomalies (SSHA) from Jan. 1993 to Dec. 2001 measured by TOPEX/Poseidon (T/P) satellite altimetry indicate that there are two energy highs of SSHA fluctuations on both sides of the Luzon Strait. The highs centered at (19.5°N, 119.5°E) and (22.0°N, 124.0°E) respectively, are separated by a low energy band in the Strait. Empirical Orthogonal Function (EOF) analysis on the "Far Field" suggests that fluctuations of these two areas are mutually independent. EOF analysis on the "Near Field" shows that SSHA oscillation in the northeastern South China Sea (SCS) is dominated by seasonal variations accompanied with significant intra-seasonal and inter-annual fluctuations. Among which, EOFI and EOF2 reflect 66.7% of the total variance. They are both seasonal but showing three months difference in phase. The basic pattern of EOFI appears to be the seasonal SSHA oscillation centered at (18.0°N, 119.0°E) northwest off Luzon Island, which shows maximums (minimums) in August/Septemb     

Height measurement of DNA molecules with lift mode AFM

Atomic force microscopy (AFM) can be used to im-age and study the local properties of the sample surfacethrough tip/sample interactions. There are three operationmodes: contact mode, non-contact mode and tappingmode. Mostly, the measured heights of dsDNA were only0.7—0.8 nm[1—8] in air by tapping mode atomic force mi-croscopy (TMAFM), which were much less than the gen-erally accepted diameter of 2.0—2.2 nm[9]. In TMAFM, stable imaging is available when the tip is closer to sample surf…     

喷流塔传质区高度和压降计算

通过理论分析及实验研究,得出了喷流塔传质区高度和压降计算式,计算值与实测值非常接近,偏差分别不大于6．3％和6．7％,为喷流塔设计和放大提供了可靠依据。     

Dynamic analysis of QTL for plant height at different developmental stages in maize （Zea mays L.）

Plantheightisoneofimportantagronomictraitsinmaizebreeding.Inthepastfewyears,toincreasetheplantingdensityandpreventplantsfromlodging,studiesonthegeneticmechanismofplantheightweregivengreatattentionto.Sincethe1990s,molecularmarkershaveprovidedapowerfultooltostudythetraitofplantheightatthemolecularlevel[1—3].Butmostofresearchforplantheightonlyfocusedondataatmaturestage.Tillnow,about70genesorQTLshavebeenlocated[4].Moreover,somegeneshavebeenevencloned[5—7].Duringthevege-tativegrowthperiod,plant…     

渐开线齿形的精确计算与绘制

导出了由四部分组成的渐开线齿形曲线的坐标计算公式。这些公式应用于轮齿磨损量的测定及轮齿弯曲强度计算中.并给出 Auto CAD图形系统,绘出了齿轮图形,证明了计算公式的准确性。     

表面活性剂溶液泡沫特性及其在磷矿浮选中的应用

本文讨论了磷矿浮选过程中表面活性剂溶液的泡沫特性。依据实际磷矿浮选结果求出表面活性剂溶液最佳泡沫特性区间。采用处最佳泡沫特性区间的表面活性剂作捕收剂时,其浮选效果显著,回收率高达92.4％。采用复合捕收剂取代传统药剂脂肪酸,可以改善磷矿浮选效果。     

679例黎族儿童营养状况调查——以上臂围与体重身长对比分析

上臂围是评价儿童营养状况和生长发育的简易而有效的指标。1989年11月我们对海南省乐东县黎族地区679名(男375、女304名)7—14岁学龄儿童进行了上臂围、体重、身长的准确测量。上臂围值处于15—24cm 之间,并随年龄增长而增加,与体重有高度相关性。同时与北京市区7—12岁902名学龄儿童上臂围测量值比较,除11岁年龄组外,各年龄组均低于北京市区学龄儿童上臂围值。两地区儿童上臀围值有显著性差异(P<0.05—0.01)。     

圬工桥墩弯矩增大系数实用计算法

采用非线性计算方法，分析影响圬工桥墩弯矩增大系数各主要因素的性质，建立用于设计的弯矩增大系数实用计算公式，并通过回归分析，建立了有关系数的表达式。     

论提升速度的合理确定

本文对提升速度的合理确定进行了全面的论述,得出经济速度系数与提升高度的关系,为计算经济提升速度提供了依据。根据经济速度选定提升容器之后,应在保证完成任务的前提下,降低提升速度以节约电能。