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湖北蛇屋山红土型金矿床PSDs特征及其意义高帮飞1(1.北京市地质大学地质过程与矿产资源国家重点实验室中铁资源集团地质勘查有限公司)摘 要:土壤颗粒粒度分布(PSDs)是复杂物理化学作用的结果,研究表明,分形理论是刻画这一复杂过程的有利工具.通过对蛇屋山金矿床赋矿红土的PSDs研究发现,赋矿红土颗粒平均粒度在3.42~28.53μm之间,同时从风化壳浅部到深部有增加的趋势.分形统计学研究表明,赋矿红土PSDs在1.71~9.46μm范围内具有分形特征(R2>0.94),分维值(D)变化范围为2.86~2.......
of LZ/DV in the same sky kind comes directly from the integral combination of scattering and absorption functions. In theory, it represents the sky model. If the solar altitude angle is under 30°, LZ/DV... overcast sky varied by solar altitude in December 20th, 1991 (a), and July 1st, 1991 (b) 3.4 Clear The clear sky refers to the cloudless sky in CIE general sky. It is the real sky that can......
J. Cent. South Univ. Technol. (2011) 18: 1502-1508 DOI: 10.1007/s11771-011-0866-4 Three-dimensional multi-constraint route planning of unmanned aerial vehicle low-altitude penetration based... Berlin Heidelberg 2011 Abstract: To address the issue of premature convergence and slow convergence rate in three-dimensional (3D) route planning of unmanned aerial vehicle (UAV) low-altitude penetration......
an active apparatus, such as a radio altimeter, is used, which transmits radio signals and makes the aircraft vulnerable especially during high altitude flights. The concept of geomagnetic navigation... value varies with the horizontal position and the altitude of aircraft. Assuming additive measurement noise, the geomagnetism measurement value yk relates to the current aircraft horizontal position......
region and at high altitude, various factors should be comprehensively considered to perform an evaluation. In addition, characteristics with respect to the alpine region need to be considered... optimization. Based on the characteristics with respect to an underground metal mine in the high alpine region and at high altitude, the evaluation of a ventilation system is considered by four......
高度与床层流速的关系 Fig. 3 Relationship between velocity and altitude at different originality material thicknesses 根据床层流速下的平均高度的突变并结合床层压降变化来判断是否流化,并依此来综合判定临界流化速度.4种不同平均粒径范围颗粒在3种初始料层高度条件下的临界流化速度如表1所示. 图... resistance and altitude at different originality material thicknesses 图6 不同粒径范围下床层高度与床层流速的关系 (初始料层高度为10 mm) Fig. 6 Relationship between velocity and altitude at different particle......
tracking for given velocity, heading and altitude commands [10]. Even if a UAV is destroyed, other UAVs can still use the remaining neighbor-to-neighbor information to achieve consensus and realize... is the vertical track error, which is positive above the predefined altitude and negative below; can be recognized as a reference state. Based on Eqs. (10) and (13), the vertical guidance law......
interaction forces are loose. As shear rates increase, the altitude differences of the g(r*) in non- and bi-polar systems decrease gradually. For example, when shear rate =3.0, the altitude difference is 1.93... is 5.0, peak value of the g(r*) in the bi-polar system is 0.05 higher than that in the uni-polar system, whereas at shear rate =7.0, the altitude value continues to increase to 0.1. Again this means......
structure of proposed approach for alternative prioritization in G1-coefficient of variation 4 Result analysis and discussion There is a large copper polymetallic mine located at high altitude area... and safety of underground workers. The high altitude creates an extreme low oxygen and low pressured working environment, which evidently decreases both the worker’s and equipment’s working efficiency......
, namely, bottom area (TP 18B and TP 19B, altitude: 0-1 m), middle area (TP 18M and TP 19M, altitude: 3.1- 4.1 m), and top area (TP 18T, and TP 19T, altitude: 6.2-7.2 m), according to the altitude... erosion pins with the same altitude, i.e., an altitude of 0.5 m for TP 18B and TP 19B, altitude of 3.6 m for TP 18M and TP 19M, and altitude of 6.7 m for TP 18T and TP 19T, were inserted into each region......
