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81.
改进的能量守恒方法及其在CHAMP重力场恢复中的应用 总被引:1,自引:0,他引:1
XU Tianhe HE Kaifei Xi’an Research Institute of Surveying Mapping Middle Yanta Road Xi’an China. 《地球空间信息科学学报》2008,11(3):168-173
An efficient method for gravity field determination from CHAMP orbits and accelerometer data is referred to as the energy balance approach. A new CHAMP gravity field recovery strategy based on the improved energy balance approach IS developed in this paper. The method simultaneously solves the spherical harmonic coefficients, daily Integration constant, scale and bias parameters. Two 60 degree and order gravitational potential models, XISM-CHAMPO1S from the classical energy balance approach, and XISM-CHAMPO2S from the improved energy balance, are determined using about one year's worth of CHAMP kinematic orbits from TUM and accelerometer data from GFZ. Comparisons among XISM-CHAMPO1S, XISM-CHAMPO2S, EIGEN-CGO3C, EIGEN-CHAMPO3S, EIGEN2, ENIGNIS and EGM96 are made. The results show that the XISM-CHAMPO2S model is more accurate than EGM96, EIGENIS, EIGEN2 and XISM-CHAMPO1S at the same degree and order, and has almost the same accuracy as EIGEN-CHAMPO3S. 相似文献
82.
GM4型磁通门磁力仪性能检验方法 总被引:5,自引:0,他引:5
目前,磁通门磁力仪广泛应用于观测地球磁场相对变化的仪器。相对于应用,仪器的性能测试不为人们所熟悉。本文针对GM4型磁通门磁力仪的噪声特性,频率特性,线性度,温度特性等关键性能指标的测试依据、测试方法及流程给予详细的阐述。 相似文献
83.
基于新生代活动构造背景的地震重点危险区域综合研究——以安徽为例 总被引:1,自引:0,他引:1
基于地震的发生与断裂的活动性密切相关,为了科学合理并尽可能准确地判定未来地震重点危险区域,以安徽为例,利用由深浅部对比、宏微观构造解析所给出的新生代构造活动性最新研究成果,结合地震活动性资料研究结果,对一些重点部位的地震危险性进行了综合研究。结果表明,根据长时间尺度的地质构造最新研究揭示的活动性较强区域,与根据近代地震活动性资料研究反映的危险性较大区域,呈现较好的一致性特征,从而为未来地震重点危险区域的判定提供了新的较为可靠的依据和方法。 相似文献
84.
The common problems on tourism of developing countries have often been researched by west researchers until now, which can
be concluded into special words: “two sectors”, “enclave construction”, “government’s interference”, “developing scale”, and
“the industrial role of tourism” etc. In fact all the researches were done from the areas with the patronage of foreign visitors,
how is the situation of domestic tourism was ignored in some points. In this paper, another developing model compared with
the one with foreign visitors was presented to the readers on the case studies of countryside spas in China. Through this
research, one aspect of Chinese real leisure life can be understood to some extent, and the implying that for bigger developing
countries the domestic tourism can match the effect of international tourism should not be ignored at least to China. As the
developing of economy, domestic tourism will finally unite with international one together, and the common problems will disappear
step by step, therefore domestic tourism and international tourism of developing countries should be researched equally since
now.
Biography: WANG Yan-ping (1962–), male, a native of Heilongjiang Province, is a doctorate student of Chiba University of Japan.
His research insterest is environmental impact assessment. 相似文献
85.
The precipitation infiltration and runoff recharging experiment observation in the Taklimakan Desert
1 INTRODUCTIONThelocalprecipitationismostimportantavailablefreshwatersourceindeserts.TheTaklimakanDesertbelongstoanextremearidbelt.Accordingtoafewyears’limitedobservationdata,itisestimatedthattheprecipitationshouldbeintherangeof30-50mmannually.Howev… 相似文献
86.
基于GIS技术的三江平原热量资源评价 总被引:1,自引:0,他引:1
基于GIS技术,使用黑龙江省气象观测站和农垦、森工系统观测站的气温资料,以及数字高程模型(DEM)资料,运用趋势面分析法和线性内插法得到三江平原栅格化的热量资源数据。分析表明,三江平原纬度和高度因子对各项热量指标分布均有影响,经度因子主要影响年平均气温、4月平均气温、7月平均气温、≥0℃积温和≥10℃积温;佳木斯西部、双鸭山西部、鸡西大部热量资源较丰富,而青黑山、完达山、老爷岭和太平岭等地区热量资源相对较差。分析结果为合理开发利用三江平原热量资源提供了依据。 相似文献
87.
Here we report iron (Fe) isotopic data of three pure Fe solution standards (IRMM-014, GSB Fe, and NIST 3126a) and five widely used geological reference materials (RMs) from the United States Geological Survey and Geological Survey of Japan obtained on a Neptune Plus multi-collector–inductively coupled plasma–mass spectrometer (MC-ICP-MS) in our laboratory over the past 3 years. The instrumental mass bias was corrected by three independent methods: sample-standard bracketing (SSB), Ni doping?+?SSB, and 57Fe–58Fe double spike?+?SSB. Measurements reveal that both the Ni doping and double spike methods helped calibrate short-term fluctuations in mass bias. Collectively, almost all measurements of RMs yielded δ56Fe within?±?0.05 of recommended values, provided that each sample was measured four times on MC-ICP-MS. For the first time, new recommended values for NIST SRM3126a are reported (δ56Fe?=?0.363?±?0.006, 2SE, 95% CI; and δ57Fe?=?0.534?±?0.010, 2SE). 相似文献
88.
W. J. Zhang M. Zhang F. Xiao L. P. Fang D. S. Wang 《International Journal of Environmental Science and Technology》2014,11(3):731-738
Pretreatment of waste emulsions with high organic content by a combined process of vibratory shear enhanced process and Fenton’s oxidation prior to biological treatment was investigated. Vibrating membrane had shown good performance in chemical oxygen demand and oil removals and the mitigation of concentration polarization. However, the permeate after filtration processing still contained high content of organics. Thus, additional Fenton oxidation was applied to reduce the organic loading, and improve the biodegradability of the wastewater. The optimal molar ratio of ferrous iron to hydrogen peroxide was 0.05 obtained from the jar-test experiments. Removal of organics was enhanced by increasing hydrogen peroxide dosage, while efficiency of hydrogen peroxide reached maximum of 1.11(w/w) at the hydrogen peroxide dosage of 6.8 g/L. Furthermore, the biological experiments indicated that the high concentration of organics could inhibit microbial activity, which decreased the chemical oxygen demand degradation rates. The adaptive period of the microbe was greatly shortened using Fenton’s reagent at the low dosages. The improvement of the biodegradability could be explained by partial mineralization and chemical transformation of parent organic compounds after Fenton oxidation. 相似文献
89.
Calcite was synthesized by four methods, and the luminescence decay-time was measured for nine samples before and after heating
hydrothermally in the temperature range 200–400°C. Decay-time data were collected between room temperature and approximately
15 K. The decay time at room temperature is approximately 50 ms, with little difference between a given calcite before and
after hydrothermal treatment. The decay time at 15 K is always greater than at room temperature as the effect of thermal quenching
diminishes. Differences in decay time before and after heating are more apparent at low temperature owing to this reduction
in thermal quenching. The decay time decreased significantly in two samples, and an increase in decay time was observed in
the remaining seven samples following heating. Among the latter group, the change in decay time was insignificant in three
samples. The results are compared with previous data in which it was shown that the effect of heating is to increase the intensity
of luminescence. 相似文献
90.