分量质子旋进磁力仪观测误差分析   总被引：1，自引：1，他引：0  

朱兆才 《地震地磁观测与研究》2000,21(2):48-53

分析了影响质子旋进磁力仪和分量质子旋进磁力仪观测质量的因素 ,给出了分量质子旋进磁力仪补偿线圈电流允许误差、补偿线圈定向 (特别是线圈磁南北方向 )应满足的关系式和定向允许误差。提出了分量质子旋进磁力仪的使用要点  相似文献   

非刚体地球的受迫章动奥波策项和倾斜模     

夏一飞  萧耐园 《天文学报》2000,41(3):300-305

讨论了非刚体地球受迫章动奥波策项与简正模表达式中倾斜模的关系。结果表明天球历书极章动中倾斜振项对应于角动量极的章动,在球历书极章动与角动量极的章动奥波策项之和。同时还给出了岁差速率与自转极的章动奥波策项间的数学关系。  相似文献   

太阳质子事件预报研究进展     

张勤 《天文学进展》2000,18(2):120-127

就太阳质子事件预报研究的重要意义,产生太阳质子事件的太阳活动区的一般特征,质子耀斑的辐射特征,质子事件几个重要参数预报方法简述了目前的研究进展。还给出了当前为满足用户需要改进预报应着重研究的方面。  相似文献   

Core precession: flow structures and energy     

J. P. Vanyo  & J. R. Dunn 《Geophysical Journal International》2000,142(2):409-425

Experiments using a precessing liquid-filled oblate spheroid with ellipticity ( a − b )/ a =1/400 extend and clarify earlier research. They yield flow data useful for estimating flows in the Earth's liquid core. Observed flows illustrate and confirm a nearly rigid liquid sphere with retrograde drift and lagging a cavity (mantle) axis in precession. The similarities of the observed lag angle with that computed for a rigid sphere, and earlier energy dissipation research both support the use of a rigid sphere analytical model to predict energy dissipation and first-order flow within the core–mantle boundary (CMB). Second-order boundary layer and interior cylindrical flow structures also are photographed and measured. Interior flows are never turbulent or unstable at near-Earth parameters, although complex and transient flow patterns are observed within the boundary layer. Other mechanisms proposed to explain net heat loss from the Earth and maintenance of the geodynamo typically require acceptance of some critical but unproven premise. Precession and CMB configuration are known with certainty and precision. Analytical difficulties have been the obstacle. Experiments illustrate the consequences of precession and ellipticity, provide criteria for validating analytical and numerical models, and may yield direct knowledge of the Earth's deep interior with careful scaling.  相似文献   

分量核旋仪偏置电流对磁偏角测量的影响分析   总被引：5，自引：2，他引：3  

冯志生  杨冬梅  夏忠  张秀霞  梅卫萍  嵇才键 《地震》2002,22(2):60-66

从理论上定量地分析了FHD-1型分量核旋仪的偏置电流对磁偏角观测值的影响,结果表明偏置电流的漂移对磁偏角观测值的影响随偏置电流的漂移量的增大而增大、也随磁偏角观测值的增大而增大,该结果对指导台站提高该仪器磁偏角观测值的精度有一定意义。  相似文献   

ITRS/J2000坐标转换误差及其对掩星反演的影响分析     

董启甲  程艳  周中华  许嵩  卿芸  汪文君 《大地测量与地球动力学》2021,41(5):530-534

分别对ITRS/J2000转换过程中的极移/潮汐章动、常数偏差矩阵等误差造成的影响进行分析,并分析季节变化、太阳活动、地磁活动等对坐标转换精度的影响。对2019年的IGS精密星历数据进行ITRS地固系转J2000惯性系坐标分析表明,潮汐章动造成的坐标转换误差为0.44 m,春季坐标转换误差(0.23 mm)是其他季节的约3倍;常数偏差矩阵对坐标转换误差可造成1.7 m的影响。对中性大气掩星反演的轨道转换加入误差改正项进行分析表明,潮汐章动和常数偏差矩阵对反演的温度产品分别造成0.09 K和0.19 K的误差影响。建议在进行GNSS无线电掩星反演中采用潮汐章动的高频改正,并且在ITRS/J2000转换过程中推荐将常数偏差矩阵进行旋转处理。  相似文献   

Fast Variations of Spectra of Comet Halley     

Borysenko  Sergiy  Nazarchuk  Halyna  Shulman  Leonid 《Earth, Moon, and Planets》2002,90(1-4):205-215

Results of the analysis of the Comet Halley spectrophotometry,which has been carried out by H.K. Nazarchuk in 1985 with the TVscanner of the 6-meter telescope (SAO, Russia) are presented. Timevariations in the intensities of the CN, CH, C₂ and NH₂bands were investigated using the series of spectra obtained inthe spectral region λλ=410÷ 510 nm. Theauto-correlation functions for all the bands, thecross-correlation functions for C₂ lines and their Fouriertransformations are calculated to determine the frequencies andperiods of the variations. A possibility is considered thathigh-amplitude fast variations of spectral lines in Comet Halleyare caused by solar flares. The daily numbers of solar spots andproton fluxes with energies of more then 1 MeV are compared withthe spectral variations of these lines. It is shown that in theobservation periods the comet was projected onto an active regionof the Sun, but, among all the kinds of solar activity, mainlythe solar proton flux with energies less than 4 MeV coincides intime with fast intensity variations in the spectral lines. Analgorithm of cross-correlation analysis of discrete samplingseries with gaps is built, and average cross-correlation coefficientsare calculated.  相似文献   

The Distinct Light Curve Shape of the Asteroid (469)     

Xiao-bin Wang  Xi-Liang Zhang  Sheng-hong Gu 《Earth, Moon, and Planets》2005,97(3-4):233-243

The observation light curves of the main belt asteroid (469) Argentina, obtained on March 9–11 2002 and August 10–11 2004, are presented in this paper. The complex light curve of the (469) suggests that it may be in NPA rotation. Using the Fourier analysis method, some prominent spectrum values are derived individually for two subset data. Among these period values, periods of 13.00 and 8.74 h are regarded as basic components. Other derived period values can be combined linearly with these two basic period values. If the (469) is in a free-force precession mode, the motion mode will be LAM (largest-axis mode) according the ratio of precession and rotation periods. And the minimum of I ₁/I ₃ (ratio of the largest and smallest principal momentum of inertial) is 3.05. Assuming an external torque releasing by a satellite forces the (469) to precess, the mass of satellite roughly is the same order as the primary’s on condition that the precession and rotation periods are two basic values. At present, we cannot draw an unambiguous conclusion on (469)’s motion for sparse data, So the further observations are necessary for understanding the (469)’s tumbling motion farther.  相似文献   

斑鳜(Siniperca scherzeri)胃蛋白酶原A、胃质子泵基因的克隆与组织表达分析   总被引：1，自引：0，他引：1  

邓燕飞  薛洋  赵金良  钱叶周  吴超  钱德 《海洋与湖沼》2013,44(3):618-625

利用RACE技术获得了斑鳜胃蛋白酶原A(PGA1、PGA2)、胃质子泵α和β亚基cDNA序列。结果表明,PGA1、PGA2cDNA序列全长分别为1361bp、1348bp,其编码的前肽中均包含信号肽、激活肽和胃蛋白酶3个部分,成熟肽中含有2个天冬氨酸残基和6个半胱氨酸残基。PGA1与PGA2在氨基酸序列组成、理化性质、功能位点、空间结构上存在明显差异,暗示它们可能具有不同的生理功能。PGA1、PGA2的DNA序列均由9个外显子和8个内含子组成。胃质子泵α和β亚基cDNA全长序列分别为3531bp、1742bp,α亚基具有高度保守性,而β亚基具有相对变异性。斑鳜成体组织中PGA1、PGA2和胃质子泵α、β亚基的RT-PCR检测显示,它们均一致在食道和胃中大量表达,推测PGA1、PGA2与胃质子泵间的表达关系可能存在一定的协同性。  相似文献   

Application of EDA technology and μClinux operating system in the earthquake precursor instruments          下载免费PDF全文

Anhua He  Gang Zhao  Na Xue  Jun Wang  Bailin Guo  Miaoxi Guo  Zizhong Fu 《地震科学（英文版）》2009,22(1):101-106

Using Altera's Quartus Ⅱ, Nios Ⅱ IDE and Sopc Builder development tools, the proton precession magnetometer principle host hardware platform is designed in a cyclone Ⅱ series FPGA chip (EP2C35). The proton precession magnetometer principle host core circuit's single-chip system-logic design is achieved by building and configuring the Nios Ⅱ soft-core processor, developing the IO interface and sensor control circuits, programming some hardware units' VHDL code, for example the equal precision cymometer and the DPLL. Through researching the embedded operating system configuration technology and building the NIOS Ⅱ soft-core processor's μClinux cross-compile environment, the μClinux system is transplanted to the NIOS Ⅱ environment. Another important task is writing the device drivers' and user programs' code. Through these work, the design realize the host function and achieve the expected target.

  相似文献