荧光分光光度法测定海洋生物中的谷胱甘肽     

张静  吉宏武  周静  陈成成  章超桦 《广东海洋大学学报》2005,25(4):32-34

对应用荧光分光光度法测定海洋生物中还原型谷胱甘肽(GSH)含量的方法进行了研究,并测定了分属于鱼、虾、贝、藻的10种海洋生物中谷胱甘肽的含量。利用邻苯二甲醛与GSH反应构成的荧光体系,在激发波长为365nm,发射波长为425nm的条件下,方法的回收率为99.22%~99.69%,变异系数为2.16%。应用此方法测得10种海洋生物中谷胱甘肽的含量为:红笛鲷(Lutjanussanguineus)0.399mg/g,银鲳(Pampusargenteus)0.352mg/g,大海鲢(Megalopscyrinoides)0.561mg/g,尖紫蛤(Sanguinolariaacuta)0.289mg/g,菲律宾蛤仔(Ruditapesphilippinarun)0.287mg/g,墨吉对虾(Penaeusmerguiensis)0.892mg/g,凡纳滨对虾(Litopenaeusvannamei)1.434mg/g,囊藻(Colpomeniasinu-ose)0.221mg/g,石莼(Ulvalactucal)0.727mg/g,马尾藻(Sargassummuticum)0.137mg/g。  相似文献   

Orbital linkages of Comet 6P/d'Arrest based on its asymmetric light curve     

S?awomira Szutowicz  Hans Rickman 《Icarus》2006,185(1):223-243

We present an investigation of different models of the nongravitational acceleration on Comet 6P/d'Arrest, as used in orbital linkages spanning 150 years from the discovery of the comet in 1851 until the recent observations made in 2001. Some of our models use the time-shifted g-like function to represent the variation of outgassing rate, but the main thrust is on models using instead a production curve that is fitted to recent light curve observations—mainly those in 1976. We pay special attention to the proper scaling of such a production curve, when applied to other apparitions with a different perihelion distance q, and we find a best fit with a q^−1.6 power-law. Generally, the best fit is found with models, in which the acceleration components are expressed in terms of the angular parameters of the rotating nucleus. We thus find the orientation of the spin axis, and using the orbital evolution we are able to predict a variable time shift of the outgassing curve. The very best results are found when applying this time shift to the light-curve based, angular models. The totality of the 1851-2001 observations can then be linked with a mean residual of less than 4″. This may be brought down to ∼^2″ by solving for individual ‘activity parameters’ of all apparitions, which are multiplicative factors applied to the acceleration amplitudes. These turn out to be within 10% of unity for the best fit. We have also performed a linkage to the observations of Comet 1678 (La Hire) using our models. We find an indication of a secular increase of the amount of asymmetry of the outgassing with respect to perihelion, part of which is due to the variable time shift caused by the orbital evolution.  相似文献   

Effect of single arrival time on the hypocentral focal depth determination     

Nitzan Rabinowitz  David M. Steinberg 《Geophysical Journal International》1988,94(3):567-570

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SHORT COMMUNICATION APPLICATION OF THE POWELL METHOD TO THE OPTIMIZATION OF FLOW INJECTION SYSTEMS     

M.DELVALLE  J.ALONSO  M.POCH  J.BARTROLí 《地理学报(英文版)》1988,(Z1)

This paper describes the application of the Powell algorithm to the optimization of a flow injectionsystem configuration.The performance of this algorithm has been compared with the modified simplexmethod.The system studied is the determination of ammonia,based on the indophenol blue reaction.Alinear combination of sensitivity and sample throughput is used as the objective function because of itssimultaneous optimization capability.Results obtained show that the proposed method may reach theoptimal conditions with a lower number of experimental evaluations.  相似文献   

Synthetically adaptive robust filtering for satellite orbit determination   总被引：7，自引：0，他引：7  

YANG Yuanxi & WEN Yuanlan . Xi''''an Research Institute of Surveying  Mapping  Xi抋''''an  China  . College of Aerospace  Material Engineering  National University of Defense Technology  Changsha  China 《中国科学D辑(英文版)》2004,47(7):585-592

The precise orbit information is the premise of the application of satellite, and the precise orbit deter- mination includes dynamic and geometric methods. The dynamic method estimates the position and veloc-ity of a satellite at one epoch by extending the obser-vational arc in order to include more observations of different epochs in it. It is realized by integrating the dynamic equation of the satellite so that the observa-tions at different epochs are related to the particular state. The dy…  相似文献   

The eastern continuation of the Cadomian orogen: U–Pb zircon evidence from Saxo-Thuringian granitoids in south-western Poland and the northern Czech Republic     

Żelaźniewicz  Andrzej  Dörr  Wolfgang  Bylina  Paweł  Franke  Wolfgang  Haack  Udo  Heinisch  Helmut  Schastok  Janina  Grandmontagne  Klaus  Kulicki  Cyprian 《International Journal of Earth Sciences》2004,93(5):773-781

We report U–Pb single zircon ages from three pre-Variscan granitoids in the NE part of the Bohemian Massif. The Platerówka granodiorite from the Lausitz-Izera Unit, the Polish Sudetes, has been dated at 533±9 Ma. The Bitouchov granite form the SW part of the South Krkonoe Unit, the Czech Sudetes, gave an age of 540+11/–10 Ma, and the Wdroe granodiorite in the Fore-Sudetic Block yielded 548±9 Ma. All these latest Vendian/Early Cambrian granitoids represent the post-tectonic expression of a late Proterozoic Cadomian orogenic cycle and demonstrate the eastward extent of the Cadomian basement into the Variscan orogen. Granodiorites of similar age have so far been reported from Brittany and especially from the Saxo-Thuringian Terrane to the NE and SW of the Elbe Fault Zone. We conclude that the Saxo-Thuringian Terrane extends across the Elbe and Sudetic Marginal Fault Zones into the Fore-Sudetic Block.  相似文献   

Low-grade metamorphic rocks from the Pulur complex,NE Turkey: implications for the pre-Liassic evolution of the Eastern Pontides     

Gültekin?Topuz  Rainer?AltherrEmail author  Muharrem?Sat?r  Winfried?H.?Schwarz 《International Journal of Earth Sciences》2004,93(1):72-91

In the Pulur complex (Sakarya Zone, Eastern Pontides, Turkey) a low-grade tectonometamorphic unit (Doankavak) is exposed in three tectonic windows beneath a complex medium-pressure high-temperature metamorphic unit of late Carboniferous age. The thrust plane between both units is transgressively covered by Liassic conglomerates. The Doankavak unit comprises a sequence of metabasites with MORB-type chemical compositions and phyllites, with subordinate calcareous phyllites, marbles, quarzofeldspathic schists and metacherts. This sequence is interpreted as a former accretionary complex related to the consumption of the Palaeotethys. Mineral parageneses in the metabasites allow for the distinction of two domains with slightly different peak metamorphic conditions, i.e. 375–425 °C/0.5–0.8 GPa (greenschist facies) and 400–470 °C/0.6–1.1 GPa (albite-epidote amphibolite facies). The age of metamorphism is constrained at ~ 260 Ma (early Late Permian) by two Rb-Sr mineral-whole rock ages (hornblende, phengite) and one ⁴⁰Ar/³⁹Ar single step total fusion age (phengite). In conjunction with previous data on other accretionary complexes in the Sakarya zone in Northern Turkey, the data presented in this study suggest a continuous subduction of the Palaeotethys at least from Early/Late Permian to Late Triassic and a discontinuous preservation of accretion complexes in both space and time.  相似文献   

Atmospheric densities derived from CHAMP/STAR accelerometer observations   总被引：3，自引：0，他引：3  

S. Bruinsma  D. Tamagnan  R. Biancale 《Planetary and Space Science》2004,52(4):297-312

The satellite CHAMP carries the accelerometer STAR in its payload and thanks to the GPS and SLR tracking systems accurate orbit positions can be computed. Total atmospheric density values can be retrieved from the STAR measurements, with an absolute uncertainty of 10-15%, under the condition that an accurate radiative force model, satellite macro-model, and STAR instrumental calibration parameters are applied, and that the upper-atmosphere winds are less than . The STAR calibration parameters (i.e. a bias and a scale factor) of the tangential acceleration were accurately determined using an iterative method, which required the estimation of the gravity field coefficients in several iterations, the first result of which was the EIGEN-1S (Geophys. Res. Lett. 29 (14) (2002) 10.1029) gravity field solution. The procedure to derive atmospheric density values is as follows: (1) a reduced-dynamic CHAMP orbit is computed, the positions of which are used as pseudo-observations, for reference purposes; (2) a dynamic CHAMP orbit is fitted to the pseudo-observations using calibrated STAR measurements, which are saved in a data file containing all necessary information to derive density values; (3) the data file is used to compute density values at each orbit integration step, for which accurate terrestrial coordinates are available. This procedure was applied to 415 days of data over a total period of 21 months, yielding 1.2 million useful observations. The model predictions of DTM-2000 (EGS XXV General Assembly, Nice, France), DTM-94 (J. Geod. 72 (1998) 161) and MSIS-86 (J. Geophys. Res. 92 (1987) 4649) were evaluated by analysing the density ratios (i.e. “observed” to “computed” ratio) globally, and as functions of solar activity, geographical position and season. The global mean of the density ratios showed that the models underestimate density by 10-20%, with an rms of 16-20%. The binning as a function of local time revealed that the diurnal and semi-diurnal components are too strong in the DTM models, while all three models model the latitudinal gradient inaccurately. Using DTM-2000 as a priori, certain model coefficients were re-estimated using the STAR-derived densities, yielding the DTM-STAR test model. The mean and rms of the global density ratios of this preliminary model are 1.00 and 15%, respectively, while the tidal and latitudinal modelling errors become small. This test model is only representative of high solar activity conditions, while the seasonal effect is probably not estimated accurately due to correlation with the solar activity effect. At least one more year of data is required to separate the seasonal effect from the solar activity effect, and data taken under low solar activity conditions must also be assimilated to construct a model representative under all circumstances.  相似文献   

利用中心差分法进行GPS定速时最佳点数的选取     

王潜心  徐天河  龚佑兴 《武汉大学学报(信息科学版)》2012,37(3):265-268,353

分析了利用中心差分法进行GPS定速时的主要误差来源,证明了当数据采样率一定时,增加中心差分法的点数可减少微分过程中的截断误差,但同时会放大导出相位率的观测误差,得出中心差分法的最佳点数应使这两种误差之和最小的结论。实验结果表明,当数据采样间隔为1s、载体平均速度和加速度为20m.s-1和0.2m.s-2时,9个点的中心差分法定速精度最高。  相似文献   

利用C波段转发数据实现GEO卫星轨道确定     

毛悦  宋晓勇  贾小林  吴显兵  冯来平 《测绘科学技术学报》2012,29(3):175-178

为了提高我国卫星导航系统GEO卫星定轨能力,针对我国卫星导航系统所特有的新数据和新方法,利用CAPS系统的C波段转发式测距数据进行了单GEO卫星定轨实验.在分析该方法技术特点的基础上,从定轨残差和轨道重叠弧段比较等方面,对定轨结果进行了分析.由于设备转发时延是影响该方法定轨精度的重要因素,因此同时还分析了系统偏差对定轨精度的影响,得出了一些有益的结论.  相似文献