Geosystem Engineering最新文献_第9页

Smooth model of blasting seismic wave signal denoising based on two-stage denoising algorithm 基于两阶段去噪算法的爆破地震波信号平滑去噪模型

IF 1.7

Geosystem Engineering Pub Date : 2020-06-16 DOI: 10.1080/12269328.2020.1778543

Miao Sun, Li Wu, Chunjun Li, Qing Yuan, Yuchun Zhou, Xu Ouyang

{"title":"Smooth model of blasting seismic wave signal denoising based on two-stage denoising algorithm","authors":"Miao Sun, Li Wu, Chunjun Li, Qing Yuan, Yuchun Zhou, Xu Ouyang","doi":"10.1080/12269328.2020.1778543","DOIUrl":"https://doi.org/10.1080/12269328.2020.1778543","url":null,"abstract":"ABSTRACT In this paper, a two-stage denoising algorithm is proposed. Complementary ensemble empirical mode decomposition based on permutation entropy (CEEMD-PE) is carried out for the noisy monitoring signal in the first stage. Several denoising models are established according to the intrinsic mode function obtained by CEEMD-PE. An objective function considers both the smoothness of the denoising model and the similarity between the denoising model and the noisy monitoring signal is established, and the second stage denoising is realized by solving the objective function. The denoising model corresponding to the optimal solution of the objective function is the smooth denoising model. In order to verify the correctness of the two-stage denoising algorithm, the mixed simulation signal with noise is denoised, and based on the definition of signal-to-noise ratio, the effect of two-stage denoising is calculated. Finally, the algorithm is applied to the actual blasting seismic signal denoising processing. It is found that the proposed algorithm can not only reduce the noise interference but also retain the real part of the original signal while filtering the noise.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"234 - 242"},"PeriodicalIF":1.7,"publicationDate":"2020-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1778543","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46791267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Metal pollution assessment of surface water from the abandoned Pb mine Zaida, high Moulouya-Morocco 摩洛哥莫罗亚高海拔Zaida废弃铅矿地表水金属污染评价

IF 1.7

Geosystem Engineering Pub Date : 2020-05-29 DOI: 10.1080/12269328.2020.1772125

Siham Bouzekri, M. L. El Hachimi, K. Kara, M. El Mahi, E. Lotfi

引用次数: 7

A review of calcined clays and ceramic wastes as sources for alkali-activated materials 煅烧粘土和陶瓷废料作为碱活性材料来源的研究进展

IF 1.7

Geosystem Engineering Pub Date : 2020-05-20 DOI: 10.1080/12269328.2020.1768154

N. Rakhimova

{"title":"A review of calcined clays and ceramic wastes as sources for alkali-activated materials","authors":"N. Rakhimova","doi":"10.1080/12269328.2020.1768154","DOIUrl":"https://doi.org/10.1080/12269328.2020.1768154","url":null,"abstract":"ABSTRACT Expanding and optimising the raw materials base in accordance with increasing ecological and technical requirements is one of the determining factors of a promising future for the constantly evolving alkali-activated materials (AAMs). Because of the development of the chemistry of the inorganic materials, the range of potentially suitable aluminosilicates has changed and expanded continuously throughout the history of AAMs. Relatively recently, efforts to find more types of adequate, alternative aluminosilicate sources, in addition to conventional granulated blast furnace slag, fly ash, and metakaolin, have led to extensive studies that have substantially increased understanding around the suitability of various natural sources and wastes for production of AAMs. In recent decades, calcined clays and ceramic wastes have become significant as an alumino-silicate sources for AAMs. Extensive research forms the theoretical and practical bases for the application of calcined clays, which are diverse in composition and structure, for effective cement production. This paper reviews recent developments in the field of alkali-activated cement-based systems using calcined clays containing different amounts of 1:1 and/or 2:1 type clay and secondary minerals, and ceramic wastes, including their suitability aspects, processing features, chemical reactivities, controlling factors, potential for application.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"287 - 298"},"PeriodicalIF":1.7,"publicationDate":"2020-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1768154","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44699364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Influence of thiourea synthesis with silica fume on the corrosion rate of reinforcement concrete 硅灰合成硫脲对钢筋混凝土腐蚀速率的影响

IF 1.7

Geosystem Engineering Pub Date : 2020-05-03 DOI: 10.1080/12269328.2019.1660235

T. A. Tawfik, Magdy A. El-Yamani, A. Serag Faried, Shimaa M. Mohammed, Ghada M. Abdel-Hafez

{"title":"Influence of thiourea synthesis with silica fume on the corrosion rate of reinforcement concrete","authors":"T. A. Tawfik, Magdy A. El-Yamani, A. Serag Faried, Shimaa M. Mohammed, Ghada M. Abdel-Hafez","doi":"10.1080/12269328.2019.1660235","DOIUrl":"https://doi.org/10.1080/12269328.2019.1660235","url":null,"abstract":"ABSTRACT The examination of corrosion rate for steel reinforcement existent in concrete was carried out in the presence of silica fume and thiourea. The ordinary Portland cement (OPC) replacement was conducted with silica fume material at 5 and 10% by cement weight for concrete production, in addition to that using various percentage of thiourea (1, 2, 3 4 and 5%) added to concrete. Monitoring and estimating the corrosion rate for reinforcing steel existent in concrete with and without silica fume and thiourea was held with the usage of corrosion test cell. Besides, compressive and splitting tensile strength submerged in fresh and salty water of hardened concrete with and without silica fume and thiourea that were considered in the study. The immersion for all the samples of steel reinforcement with salty water (tap water with 1.5% of calcium sulphate and 3% of sodium chloride) for about 90 days of exposure were studied. The best results for the lowest corrosion rate were obtained when a mixture of silica fume with thiourea is used with concentrations of 10 and 3%, respectively compared with the ordinary concrete.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"146 - 158"},"PeriodicalIF":1.7,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2019.1660235","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48398621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of numerical techniques to the recognition of structural controls on porphyry Cu mineralization: a case study of Dehaj area, Central Iran 数值技术在斑岩型铜成矿构造控制识别中的应用——以伊朗中部Dehaj地区为例

IF 1.7

Geosystem Engineering Pub Date : 2020-05-03 DOI: 10.1080/12269328.2019.1700171

Narges Habibkhah, H. Hassani, A. Maghsoudi, M. Honarmand

{"title":"Application of numerical techniques to the recognition of structural controls on porphyry Cu mineralization: a case study of Dehaj area, Central Iran","authors":"Narges Habibkhah, H. Hassani, A. Maghsoudi, M. Honarmand","doi":"10.1080/12269328.2019.1700171","DOIUrl":"https://doi.org/10.1080/12269328.2019.1700171","url":null,"abstract":"ABSTRACT This paper endeavours to evaluate the structural controls of porphyry copper mineralization in Dehaj area, Central Iran, using numerical techniques, an aim for which the various data types including the location of mineral deposits, stream sediment geochemical data and faults were employed. Initially, classical statistics and the concentration-area (C-A) fractal methods were applied to identify mineralization-related geochemical anomalies, revealing the superiority of fractal technique over the traditional methods employed. In addition, a rose diagram portraying the distribution of mineral locations was compared to the distribution and trends of faults using fractal and fry analyses, showing that the spatial pattern of porphyry copper deposits is closely linked to NW- and E-trending faults. In other words, the aforementioned structural trends were plausibly the chief geographical directions controlling the mineralization. The results of this study suggest that NW- and E-trending faults have plausibly operated as corridors for the transportation of ore-bearing fluids.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"159 - 167"},"PeriodicalIF":1.7,"publicationDate":"2020-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2019.1700171","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42197600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Evaluation of the leaching characteristics of low-grade nickel laterite waste rock for indirect carbon sequestration application 用于间接固碳应用的低品位红土镍矿废石浸出特性评价

IF 1.7

Geosystem Engineering Pub Date : 2020-04-14 DOI: 10.1080/12269328.2020.1745694

R. C. Eusebio, Bernard Jomari B. Razote, Hannah Jelsy T. Del Pilar, R. Alorro, A. Beltran, A. Orbecido

{"title":"Evaluation of the leaching characteristics of low-grade nickel laterite waste rock for indirect carbon sequestration application","authors":"R. C. Eusebio, Bernard Jomari B. Razote, Hannah Jelsy T. Del Pilar, R. Alorro, A. Beltran, A. Orbecido","doi":"10.1080/12269328.2020.1745694","DOIUrl":"https://doi.org/10.1080/12269328.2020.1745694","url":null,"abstract":"ABSTRACT The potential utilization of waste rock obtained from an active nickel mine site in Mindanao, the Philippines for indirect carbon sequestration is explored in this study. X-ray diffraction (XRD), X-ray fluorescence (XRF), and inductively coupled plasma optical emission spectroscopy (ICP-OES) results showed that the sample is rich in iron, existing in three different forms: goethite (α-FeOOH), chromite (FeCr2O4), and magnetite (Fe3O4). Leaching tests performed using hydrochloric acid (HCl) showed high iron extraction rates, with a maximum average extraction efficiency of 95.35% obtained at 100°C, 4 M HCl, and 1.0 h. Morphological and physicochemical analyses conducted through scanning electron microscopy and Brunauer–Emmett–Teller (BET) method supported the high extraction rates obtained for Fe, which is due to the higher reactivity of the sample to the leaching agent as well as the higher availability of accessible sites for reaction on the sample surface as compared to other mine wastes that are previously utilized. The nickel laterite waste rock sample has the potential to be used as a feedstock for iron carbonation in indirect carbon sequestration; however, challenges such as the use of sulfide source and cost requirements must be addressed in order to fully determine its viability for industrial scale application.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"205 - 215"},"PeriodicalIF":1.7,"publicationDate":"2020-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1745694","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46820962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Quantifying the criteria for classification of mineral resources and reserves through the estimation of block model uncertainty using geostatistical methods: a case study of Khoshoumi Uranium deposit in Yazd, Iran 利用地质统计学方法通过估算区块模型不确定性来量化矿产资源和储量分类标准:以伊朗亚兹德Khoshoumi铀矿床为例

IF 1.7

Geosystem Engineering Pub Date : 2020-04-06 DOI: 10.1080/12269328.2020.1748524

Mojtaba Taghvaeenezhad, M. Shayestehfar, P. Moarefvand, A. Rezaei

{"title":"Quantifying the criteria for classification of mineral resources and reserves through the estimation of block model uncertainty using geostatistical methods: a case study of Khoshoumi Uranium deposit in Yazd, Iran","authors":"Mojtaba Taghvaeenezhad, M. Shayestehfar, P. Moarefvand, A. Rezaei","doi":"10.1080/12269328.2020.1748524","DOIUrl":"https://doi.org/10.1080/12269328.2020.1748524","url":null,"abstract":"ABSTRACT Investments and progress of mineral projects depend on the quantity (tonnage) and quality (grade) of mineral resources and reserves. This study examines the impact of various criteria used in the classification of mineral deposits or parameters defining these criteria. The data used in this study include the uranium assay analysis from 127 exploratory boreholes, which were then subjected to a three-directional variography after statistical studies to identify regional anisotropy. A grade block model was built using the optimal parameters of variograms and with the help of kriging estimator. Then, by using different methods of estimating the block model uncertainty including kriging estimation variance, block error estimation, kriging efficiency and slope of regression, classification of mineral reserves was carried out in accordance with the JORC standard code. Based on different cut-off grades, the tonnage and average grade were calculated and plotted. An innovative quantitative method based on the distribution function of the mentioned parameters and the fractal pattern of separation of populations was used for the classification of mineral reserves. The existence of the least difference between the use of standard and fractal patterns in the slope of regression method indicated less error and was a proof of more reliable results.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"216 - 225"},"PeriodicalIF":1.7,"publicationDate":"2020-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1748524","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45496698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Option values of quantity flexibility in nuclear fuel long-term contracts: an application of the least squares Monte Carlo 核燃料长期合同中数量灵活性的期权值:最小二乘蒙特卡罗的应用

IF 1.7

Geosystem Engineering Pub Date : 2020-03-03 DOI: 10.1080/12269328.2019.1683081

Hojeong Park, Heesun Jang

{"title":"Option values of quantity flexibility in nuclear fuel long-term contracts: an application of the least squares Monte Carlo","authors":"Hojeong Park, Heesun Jang","doi":"10.1080/12269328.2019.1683081","DOIUrl":"https://doi.org/10.1080/12269328.2019.1683081","url":null,"abstract":"ABSTRACT One of the important features in uranium contracts is that the quantity flexibility option is included in long-term contracts, so that buyer has the flexibility to increase or decrease the quantity purchase and adjust the delivery month depending on the market conditions. While it is important to address the value of the flexibility in the contracts, the literature on the contract valuation in uranium markets is scant. In this paper, we evaluate the quantity flexibility in the context of Korean long-term uranium contracts. Specifically, we adapt the least squares Monte Carlo method to simulate the contract value while incorporating the characteristics of option structure and the dynamics of uranium prices. Our simulation results show that the quantity flexibility can play an important role in uranium long-term contracts. The results are also robust to the choice of basis functions, which implies that the method we applied in this paper could provide correct valuation of long-term contracts. Moreover, our results provide some policy implications related to first, the KHNP’s strategy to mix of long-term and spot-market uranium contracts, and second, correct valuation of contract parameters when negotiations take place.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"86 - 91"},"PeriodicalIF":1.7,"publicationDate":"2020-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2019.1683081","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41648985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of design parameters on oil recovery performance in polymer flooding with low-salinity water-flooding 低盐水聚合物驱设计参数对采油性能的影响

IF 1.7

Geosystem Engineering Pub Date : 2020-02-24 DOI: 10.1080/12269328.2020.1732839

H. Yoo, Jeonghwan Lee

{"title":"Impact of design parameters on oil recovery performance in polymer flooding with low-salinity water-flooding","authors":"H. Yoo, Jeonghwan Lee","doi":"10.1080/12269328.2020.1732839","DOIUrl":"https://doi.org/10.1080/12269328.2020.1732839","url":null,"abstract":"ABSTRACT This study investigates the impact of design parameters on oil recovery performance in polymer flooding (PF) with low-salinity water-flooding (LSWF). Convergence technology for enhanced oil recovery (EOR) has recently been drawing attention as an upcoming technology to evolve toward similar performance and synergies. As one of the convergence technologies, PF utilizing low-salinity water is applied to improve oil recovery. In this study, an attempt is made to identify its mechanisms and to understand the low-salinity effects on PF in complex oil fields. Injection scenarios are made up to identify the efficiency of combining LSWF and PF (LSWF-PF), and sensitivity analysis is performed on the design parameters, such as slug size, salt concentration, and polymer viscosity, which are considered to be the most influential parameters. The results indicate that the efficiency of PF is significantly improved by using low-salinity water as the polymer solvent and the slug size of low-salinity water should be preferentially considered for the successful application of LSWF-PF in high-salinity reservoirs. Therefore, it is believed that a criterion can be set up to decide the design parameters of LSWF-PF, which can improve synergy effects in EOR processes.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"63 - 72"},"PeriodicalIF":1.7,"publicationDate":"2020-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1732839","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44998384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Starch graft copolymer and polymer gel applied in Bohai oilfield for water plugging and profile control and their mechanisms 淀粉接枝共聚物和聚合物凝胶在渤海油田堵水调剖中的应用及其机理

IF 1.7

Geosystem Engineering Pub Date : 2020-02-24 DOI: 10.1080/12269328.2020.1732838

Weijia Cao, Kun Xie, Xiaoyan Wang, Xiangguo Lu, X. He, Guorui Xu, Xiang Li

{"title":"Starch graft copolymer and polymer gel applied in Bohai oilfield for water plugging and profile control and their mechanisms","authors":"Weijia Cao, Kun Xie, Xiaoyan Wang, Xiangguo Lu, X. He, Guorui Xu, Xiang Li","doi":"10.1080/12269328.2020.1732838","DOIUrl":"https://doi.org/10.1080/12269328.2020.1732838","url":null,"abstract":"ABSTRACT Water plugging and profile control are becoming increasingly important in water-flooding oilfields. In this study, the experiments were conducted to determine the microscopic mechanisms and effects of water plugging, profile control, and ‘water plugging + profile control’. Initially, the starch graft copolymer and polymer gel used showed only slight changes in viscosity. However, within 12 h, the viscosities exceeded 100,000 mPa·s, which indicated that the two agents had good plugging effects. When the plugging agent was starch graft copolymer, the oil recovery with water plugging was 2% and 0.8% higher than the values for profile control with polymer gel on a heterogeneous core and parallel core, respectively. The recoveries with the ‘water plugging + profile control’ combination for the heterogeneous core and parallel core were 25.9% and 25.5%, respectively, which showed the superior enhanced oil recovery. The mechanism research showed that when the reservoir entered the middle and high water-cut development stages, the residual oil was mainly distributed in the middle- and low-permeability layers near the oil well. Thus, water plugging provided a greater increase in oil recovery. Under the actual demands of the Bohai oilfield, it would be better to adopt a combined water plugging and profile control operation.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":"23 1","pages":"197 - 204"},"PeriodicalIF":1.7,"publicationDate":"2020-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1732838","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43402316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14