[en] The research area is located in the uranium mineralization belt of southwestern Ordos basin which is covered by middle to small scale aeromagnetic and gravity data. However, The exploration has been seriously restricted due to the lack of large scale and high accuracy geophysical data, especially the airborne radioactive data. By analyzing the new measured 1:50000 aeromagnetic, airborne radioactive data and the collected gravity data, we believed that the multi-source geo-information related to uranium mineralization are aeromagnetic gradient belt, airborne radioactive high-field zone, immigration zone of active uranium extracted from airborne radioactive survey, compound edge zone of local gravity anomalies, and the airborne radioactive anomalies are the direct sign for uranium mineralization. A weak information extraction and predict method was built up based on geological unit encoding statistics of airborne radioactive data and removing the background interference, which is composed of narrowing the scope of prospecting by active uranium migration area (< 0), identifying the deep uranium mineralization by the compound zone of paleo-uranium over 2.00 × 10^-6, active uranium below -0.05 × 10^-6, normalized uranium over 0.30 × 10^-6, uranium increments over 0.20 × 10^-6 and sm9 over 0.30 × 10^-6. Based on the above research results and the analyses on uranium mineralization geological conditions, the exploration marks have been set up and 5 uranium prospects have been delineated. One of the prospects was verified by ground survey the prospect, uranium content calculated from the ground gamma spectrometry is up to 556 × 10^-6, and the assayed uranium content is up to 0.018% (cut grade 0.01%), which showed great prospecting potential. (authors)

[en] The information of the predecessors research was collected and sorted to analyze the uranium mineralization conditions in Xuemisitan area in the northwest of Xinjiang. It was believed that the uranium mineralization in this area was closely related to the tectonic environment, strata and volcanism, ore-controlling structures and the uranium source. By combining the feature of known uranium deposits and the field geological survey result, the distribution regularity of uranium was summarized and 6 First Level and 11 Second and Third Level prospecting areas were delineated in the study area for the future uranium exploration. (authors)

[en] For obtaining spatial-temporal soil moisture information in large range, a study on the relationship of soil moisture and dielectric constant obtained by space-borne microwave radiometers and scatterometers data was performed. Microwave signal is much related to dielectric constant of object observed, and soil dielectric constant is decided by soil moisture, this is the basis of using microwave remote sensing technology for soil moisture monitoring. This study focuses on the transformation of soil moisture and soil dielectric constant. The Dobson semi-empirical model was used to build a simulated database, then, the coefficients calibrated of Hallikainen formula by the least square regression method at radiometer SMOS(1.4GHz), AMSR-E(6.9GHz), and scatterometer ERS-WCS and METOP-ASCAT (both at 5.3GHz) frequency-points were performed to set up the simplified models to related the real part of the dielectric constant and the soil volumetric moisture content. The validations are performed using both simulated data of the Dobson model and in-situ observations, the results show that the simplified models have good accuracy and practicality

[en] The research area is located in the northern part of Beishan area, Gansu province and rich in uranium resources with Hongliuhe uranium deposit, Fangshankou uranium-vanadium phosphate deposit and lot of radioactive abnormal lies. By collecting and collating the data of predecessors, we studied the characteristics of typical uranium deposits and analyzed the uranium mineralization conditions, established a geophysical-mathematical prediction model for the carbonaceous-siliceous-argillaceous type uranium deposits. With the results of field work, two uranium prospects was predicted in Hongliuhe-Fangshankou area. (authors)