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31.
层次分析与模糊数学综合评价法在矿山环境评价中的应用 总被引:2,自引:1,他引:1
采用遥感技术提取矿山环境评价因子,运用层次分析法与模糊数学法对三江成矿带南段矿山环境进行综合评价。层次分析法确定的矿山环境评价因子按权重排序,依次为植被覆盖率、土地利用、地形地貌、矿山地质灾害、水土流失和矿山开发占地;模糊数学法评价的区域矿山环境隶属第一等级"好"。通过GIS平台,按权重值对评价因子进行叠加、成图,实现了三江成矿带南段的矿山环境评价。层次分析与模糊数学综合评价法,不仅综合考虑矿山环境影响因子,且充分发挥了2种数学方法的优点,将动态与静态、定量与非定量等指标有机结合,发挥其因素和过程的模糊性,减少了专家人为评分的主观性,使评价结果更符合实际。 相似文献
32.
Yongchang Chen Yunbin Yuan Baocheng Zhang Teng Liu Wenwu Ding Qingsong Ai 《GPS Solutions》2018,22(3):72
A modified mixed-differenced approach for estimating multi-GNSS real-time clock offsets is presented. This approach, as compared to the earlier presented mixed-differenced approach which uses epoch-differenced and undifferenced observations, further adds a satellite-differenced process. The proposed approach, based on real-time orbit products and a mix of epoch-differenced and satellite-differenced observations to estimate only satellite clock offsets and tropospheric zenith wet delays, has fewer estimated parameters than other approaches, and thus its implementing procedure is efficient and can be performed and extended easily. To obtain high accuracy, the approach involves three steps. First, the high-accuracy tropospheric zenith wet delay of each station is estimated using mixed-differenced carrier phase observations. Second, satellite clock offset changes between adjacent epochs are estimated using also mixed-differenced carrier phase observations. Third, the satellite clock offsets at the initial epoch are estimated using satellite-differenced pseudorange observations. Finally, the initial epoch clock results and clock offset changes are concatenated to obtain the clock results of the current epoch. To validate the real-time satellite clock results, multi-GNSS post-processing clock products from IGS ACs were selected for comparison. From the comparison, the standard deviations of the GPS, GLONASS, BeiDou and Galileo systems clock results are approximately 0.1–0.4 ns, except for the BeiDou GEO satellites. The root mean squares are about 0.4–2.3 ns, which are similar to those of other international real-time products. When the clock estimates were assessed based on a pseudo-kinematic PPP procedure, the positioning accuracies in the East, North and Up components reach 5.6, 5.5 and 7.6 cm, respectively, which meet the centimeter level and are comparable to the application of other products. 相似文献
33.
碳质黑色页岩形成于各个不同地质历史时期的海洋缺氧水体中,通常可视作潜在的成矿物质来源,目前对于碳质黑色页岩的研究主要集中在传统能源矿产领域,其与金矿床相关成矿机制的关联尚缺乏系统性的深入研究.在总结近10年造山型金矿中碳质黑色页岩研究成果的基础上,归纳前人对碳质黑色页岩的来源、形成环境和过程、地球化学特征以及其与造山型金矿化的成矿物质来源、元素迁移—活化—沉淀机制关系的认识:①碳质黑色页岩主要形成于海洋静闭极度缺氧环境;②碳质黑色页岩比普通黑色页岩更富集金、银、钼、钒、镍和铬等稀有金属;③碳质黑色页岩能够通过地层的区域变质运动释放金元素进入深部变质成矿流体;④碳质黑色页岩通常相对其他岩层在构造活动中更易形成容矿构造并作为强力还原剂导致金的沉淀;⑤碳质黑色页岩能够作为显著的找矿标志指导找矿.然而,这些认识不仅与造山型金矿床的传统成因模式存在一定的差异,而且也将引起传统找矿勘查评价准则的改变.目前,我国对于造山型金矿床中碳质物的研究仍较为薄弱,亟待开展该领域的研究,为找矿勘察工作提供科学依据. 相似文献
34.
采用郯庐断裂带苏皖段及邻区近50 a的地震数据,在定量分析区域最小完备震级Mc和推导b值计算的极大似然法基础上,重点研究G-R关系,尤其是b值时空分布演化特征,并依据b值指示意义进行5级以上地震关联性和断裂带影响区域的构造应力分布状况分析.结果显示,依据b值的时间分布特征,研究区中强地震发生时段与中短期b值下降时段关联... 相似文献
35.
Megalobrama pellegrini is a cyprinid fish endemic to upper reaches of the Changjiang(Yangtze) River, China, which is also an important economic species in the local area. In recent years,resources of this species have decreased sharply and its conservation has drawn great attention. In the present study, we collected 120 individuals from the Longxi River, a tributary isolated from the main channel of the Changjiang River, where M. pellegrini is still relatively abundant. Using two different molecular markers, mitochondrial cytochrome b(cyt b) gene, and nuclear microsatellite(simple sequence repeat,SSR), we analyzed the genetic diversity of this isolated population. The results show that sequence genetic diversity was low(H_d:0.290 and P_i: 0.000 77 for cyt b gene),while the SSR genetic diversity was high(H_o:0.824 4±0.147 2,H_e: 0.823 510.145 1). Analysis indicated that this population had experienced a bottleneck,with inbreeding and small effective population size(around 50). Based on SSR data, relatedness analyzing revealed that the 120 samples were grouped into 10 completely independent clusters. It was inferred that the mating system of M. pellegrini was polygamy. We suggested that the low genetic diversity could be induced by the overfishing and inbreeding depression. Therefore, we suggested that the urgent conservation measures should be taken to control the overfishing and give better conditions for the fish to grow and spawn, then to restore population size. 相似文献
36.
在吐哈盆地中东部地区已投入部分铀矿找矿工作,但是没有取得较好的成果,本文拟对吐哈盆地中东部长流水地区铀成矿条件进行前景分析,对找矿提供一定的理论依据。研究区位于骆驼圈子浅凹陷中,南部蚀源区总体铀含量较高,目的层也具有较高的铀背景值,满足地下水的"补—径—排"条件,层间氧化带发育,通过钻探工作发现部分的铀异常以及铀矿化现象,具有较好的成矿条件。 相似文献
37.
The extraordinary transmission(ET) phenomenon is examined for waves propagating through gaps of vertical thin barriers in channels with a hypersingular boundary element method model on the linear potential theory, and an estimate formula based on small gap approximation for predicting the number of ET frequencies is proposed.Numerical computations are carried out to examine the influences of barrier number, barrier interval, gap size, gap position and barrier arrangement on extraordinary transmission and wave height in the channel. It shows that all of those factors evidently affect the extraordinary transmission frequencies. The contours of wave amplitude show that very high waves can be excited in the basins between barriers at the extraordinary transmission frequencies. Proper arrangement of barriers in a channel can avoid the occurrence of ET phenomenon and reduce wave height in the channel. 相似文献
38.
Accessible high-quality observation datasets and proper modeling process are critically required to accurately predict sea level rise in coastal areas. This study focuses on developing and validating a combined least squares-neural network approach applicable to the short-term prediction of sea level variations in the Yellow Sea, where the periodic terms and linear trend of sea level change are fitted and extrapolated using the least squares model, while the prediction of the residual terms is performed by several different types of artificial neural networks. The input and output data used are the sea level anomalies (SLA) time series in the Yellow Sea from 1993 to 2016 derived from ERS-1/2, Topex/Poseidon, Jason-1/2, and Envisat satellite altimetry missions. Tests of different neural network architectures and learning algorithms are performed to assess their applicability for predicting the residuals of SLA time series. Different neural networks satisfactorily provide reliable results and the root mean square errors of the predictions from the proposed combined approach are less than 2?cm and correlation coefficients between the observed and predicted SLA are up to 0.87. Results prove the reliability of the combined least squares-neural network approach on the short-term prediction of sea level variability close to the coast. 相似文献
39.
Hao-Yi Wan Shu-Lei Cao Huan-Yu Teng Yu Liu Jian-Chen Zhang Tong-Jie Zhang 《天文和天体物理学研究(英文版)》2018,(10)
In order to explore the properties of cosmic neutrinos, i.e. sum of the neutrino mass(∑m_ν) and the effective number of neutrino species(N_(eff)), which affects the Hubble expansion rate H(z)and the power of observational Hubble parameter data(OHD) in constraining cosmological parameters under the ΛCDM model, we utilize OHD to constrain the properties of cosmic neutrinos and apply an accurate H(z) function with mνand Neff. First, we simulate new OHD beyond the existing 43 OHD. According to the predictions of measurements of H_0(the current H(z) value), baryon acoustic oscillations(BAO) peaks, Sandage-Loeb(SL) test and cosmic microwave background(CMB), we assume observational accuracy up to 2% and redshift 0 z ≤5. With simulated H(z) data obtained from the fiducial model, we constrain the parameters including mνand Neff. When all parameters are set free, mν 0.196 eV(95%) and N_(eff)= 2.984 ± 0.826(68%) are obtained, and when fixing Neff as the standard baseline 3.046, we attain ∑m_ν 0.240 eV(95%). These constrained results are much tighter than the ones obtained by the current OHD, which makes the prospect of OHD in constraining cosmological parameters more promising as its accuracy and quantity grow. 相似文献
40.
基于MapGIS的气象预报分析系统的设计与实现 总被引:1,自引:0,他引:1
介绍了以MapGIS地理信息系统为技术平台所开发的气象预报分析系统(WeatherGIS)的组织结构,数据录入、来源数据编辑、数据处理、结果数据编辑、数据输出、系统设置等模块的主要功能,以及系统应用状况。 相似文献