鲜浒苔稀硫酸水解产糖工艺研究   总被引：1，自引：1，他引：0  

冯大伟  姜鹏  李富超  秦松  赵瑾  陈华新 《海洋科学》2014,38(12):29-33

分别用质量分数为0.6%、1.0%、1.4%、1.8%、2.2%的稀硫酸在121℃高温高压的条件下水解鲜浒苔30、60、90 min,浒苔水解残留物再用纤维素酶酶解,用DNS法测定上述各步骤中的还原糖产量。结果表明,浒苔总糖含量为67.2%。稀硫酸水解工艺中,硫酸质量分数为1.8%、水解90 min,浒苔还原糖转化率最高,达59.9%,每克干质量浒苔可产生447.0 mg还原糖。稀硫酸水解残留物纤维素酶酶解工艺中,浒苔还原糖转化率较低,在硫酸质量分数为0.6%、水解时间为60 min时还原糖转化率出现最大值,仅为6.5%。结果显示浒苔稀硫酸水解产还原糖效果显著,但并不能促进纤维素酶酶解。浒苔糖化可单独采用稀硫酸水解工艺,本实验条件下的最佳工艺条件为1.8%硫酸水解90 min。本研究探索了浒苔糖化工艺条件,对后续的浒苔燃料乙醇发酵研究具有一定的参考意义。  相似文献   

血管介入手术中的柔性虚拟力触觉系统研究     

冯安洋  陈笋  陈柏  耿令波  吴洪涛 《南京气象学院学报》2014,6(6):520-524

随着微创手术的发展,虚拟手术的应用前景越来越广阔.力反馈作为虚拟手术的核心技术,其实现的效果直接影响了虚拟手术的沉浸感.通过对经典包围盒碰撞检测算法进行研究比对,选择了球包围盒的碰撞检测算法,并建立了精确的反馈力计算模型,实现了介入血管中的柔性碰撞仿真.该仿真具有很高的实时性和精度.  相似文献   

近红外CO₂高光谱探测仪通道选择          下载免费PDF全文

毕研盟  杨忠东  卢乃锰  张鹏  王倩 《应用气象学报》2014,25(2):143-149

近红外波段 (1.6 μm) 遥感可探测大气CO₂含量信息,应用于碳循环研究中。宽波段、高分辨率不但对仪器研制是一个挑战,而且巨大的数据量对观测的正演、反演也是一个挑战性课题。该文应用自由度及信息量分析法,对近红外高光谱波段中探测通道进行CO₂信息量分析,选择前20~100个高信息量的CO₂探测通道,并进行了反演模拟测试。结果表明:前20个高信息量通道占所有通道总信息量的76.4%,仅用所选的前20个通道进行反演,与所有通道参加反演的结果相比,误差增加0.3×10-6;通道数增至60时,信息量增加,通道数再增加,信息量则增加不显著;CO₂反演误差存在相似的关系。在高CO₂信息量分布上,弱吸收性质的1.6 μm波段和强吸收性质的2.06 μm波段表现出不同特点。  相似文献   

引入强跟踪滤波器的 IMM 算法在导航定位解算中的应用     

刘宇玺  吴鹏  刘文祥  王飞雪 《全球定位系统》2014,(5):46-50

针对单一模型对城市机动载体运动状态估计不足的问题,本文在标准交互式多模型算法的基础上引入强跟踪滤波器,并以“当前”模型和“CV”模型作为基础模型进行交互式模型滤波。利用信号源仿真动态数据分析对比了利用单一模型算法、标准交互式多模型算法和引入强跟踪滤波器的交互式多模型算法的定位解算性能。实验结果表明：本文提出的基于强跟踪滤波器的交互式多模型算法相比于“当前”模型滤波和标准IM M 算法径向误差方差分别从19.11和16.78降低到13.24．  相似文献   

基于VB6.0的水准网数据处理程序的实现     

陈帅  王鹏 《全球定位系统》2014,39(4):73-77

基于VB6.0语言环境设计了水准网综合数据处理的程序,实现了基于平差基准的最小二乘估计和抗差估计,自动搜索闭合条件、计算闭合差,弥补了现有矿区水准网平差程序或软件中存在的不足,针对程序实现中的关键性问题进行了比较详细的分析并给出了部分程序实现的代码,并通过实测数据进行了验证。  相似文献   

The Relationship between the El Nin o/La Nin a Cycle and the Transition Chains of Four Atmospheric OscillationsPart I: The Four Oscillations简     

PENG Jingbei  CHEN Lieting  ZHANG Qingyun 《大气科学进展》2014,31(2):468-479

The first leading modes of the interannual variations in low-level circulation over the North and South Pacific are the Northern Oscillation （NO） and Southern Oscillation （SO）,which are oscillations in sea level pressure anomalies （SLPAs）between the eastern and western Pacific Ocean.The second leading modes are the North Pacific Oscillation （NPO） and the Antarctic Oscillation （AAO）,which reflect oscillations between the subtropics and the high and middle latitudes.The transition chains of these four oscillations were investigated using the National Centers for Environmental Prediction-National Center for Atmospheric Research （NCEP-NCAR） reanalysis data.The general pattern of the transition chain between the NO and NPO was from the negative phase of the NO （NO-） to the positive phase of the NPO （NPO＋）,then from NO＋ to NPO-to NO-.The whole transition chain took about 4-6 years.The general pattern and period of the transition between the SO and AAO were similar to those between the NO and NPO.In addition,the transition chains between the NO and NPO,and the SO and AAO,were almost simultaneous.The transition chains of the four oscillations were found to be closely connected,with the eastward propagations of SLPAs occurring along both sides of the Equator.  相似文献   

The Interdecadal Changes of South Pacific Sea Surface Temperature in the Mid-1990s and Their Connections with ENSO简     

LI Gang  LI Chongyin  TAN Yanke  BAI Tao 《大气科学进展》2014,31(1):66-84

The characteristic changes of South Pacific sea surface temperature anomalies （SSTAs） for the period January 1979 to December 2011, during which the 1990s Pacific pan-decadal variability （PDV） interdecadal regime shifts occurred, were examined. Empirical Orthogonal Function （EOF） analysis was applied to the monthly mean SSTA for two sub-periods： January 1979 to December 1994 （P 1） and January 1996 to December 2011 （P2）. Both the spatial and temporal features of the leading EOF mode for P1 and P2 showed a remarkable difference. The spatial structure of the leading EOF changed from a tripolar pattern for P 1 （EOF-P 1） to a dipole-like pattern for P2 （EOF-P2）. Besides, EOF-P 1 （EOF-P2） had significant spectral peaks at 4.6 yr （2.7 yr）. EOF-P2 not only had a closer association with E1 Nifio-Southern Oscillation （ENSO）, but also showed a faster response to ENSO than EOF-P1 based on their lead-lag relationships with ENSO. During the development of ENSO, the South Pacific SSTA associated with ENSO for both PI and P2 showed a significant eastward propagation. However, after the peak of ENSO, EOF-P1 showed a stronger persistence than EOF-P2, which still showed eastward propagation. The variability of the SSTA associated with the whole process of ENSO evolution during P1 and the SSTA associated with the development of ENSO during P2 support the existence of ocean-to-atmosphere forcing, but the SSTA associated with the decay of ENSO shows the phenomenon of atmosphere-to-ocean forcing.  相似文献   

Large-Eddy Simulation of Mesoscale Circulations Forced by Inhomogeneous Urban Heat Island   总被引：1，自引：1，他引：0  

Ning Zhang  Xueyuan Wang  Zhen Peng 《Boundary-Layer Meteorology》2014,151(1):179-194

The large-eddy simulation mode of the Weather Research and Forecasting model is employed to simulate the planetary boundary-layer characteristics and mesoscale circulations forced by an ideal urban heat island (UHI). In our simulations, the horizontal heterogeneity of the UHI intensity distribution in urban areas is considered and idealized as a cosine function. Results indicate that the UHI heating rate and the UHI intensity heterogeneity affect directly the spatial distribution of the wind field; a stronger UHI intensity produces a maximum horizontal wind speed closer to the urban centre. The strong advection of warm air from the urban area to the rural area in the upper part of the planetary boundary-layer causes a more stable atmospheric stratification over both the urban and rural areas. The mesoscale sensible heat flux caused by the UHI circulation increases with UHI intensity but vanishes when the background wind speed is sufficiently high $(>$ 3.0  $\mathrm{{m\,s}}^{-1})$ .  相似文献   

GB-SAR影像坐标三维变换水平转角计算方法     

王鹏  李伟城  邢诚 《测绘科学》2022,47(2)

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西藏某铅多金属矿土壤地球化学特征及找矿     

彭中山  刘君 《四川地质学报》2014,34(3)

通过西藏芒康某铅多金属矿土壤地球化学元素变异系数、富集系数、叠加强度、蚀变-矿化强度、致矿因素等五个方面进行综合研究,结合区内已有地质、矿产资料分析认为测区内主成矿元素为Pb、Zn、Ag、Cu,重要伴(共)生元素或指示元素为Cd、Hg、W、As、Zn、Sb、Mo、Au、Sn。该次土壤测量在区内共圈定元素综合异常23个,通过对找矿潜力较大的异常进行推断解释,同时结合区域成矿规律,对区内铅多金属找矿方向进行了初步探讨。  相似文献