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Joint simulation of cross-correlated ore grades and geological domains:an application to mineral resource modeling

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Frontiers of Earth Science 2023年第2期17卷 417-436页

作者： Nasser MADANI mohammad maleki School of Mining and Geosciences Nazarbayev UniversityAstana 010000Kazakhstan Department of Metallurgical and Mining Engineering Universidad Católica del NorteAntofagasta 1270709Chile

Spatial modeling of ore grades is frequently impacted by the local variation in geological domains such as lithological characteristics,rock types,and geological *** this information may lead to biased results in the final ore grade block model,subsequently impacting the downstream processes in a mining chain *** the current practice of ore body evaluation,which is known as stochastic cascade/hierarchical geostatistical modeling,the geological domain is first characterized,and then,within the geological model,the ore grades of interest are *** practice may be unrealistic in the case when the variability in ore grade across the boundary is gradual,following a smooth *** reproduce such characteristics,the cross dependence that exists between the ore grade and geological formations is considered in the conventional joint simulation between continuous and categorical ***,when using this approach,only one ore variable is considered,and its relationship with other ore grades that may be available at the sample location is *** this study,an alternative approach to jointly model two cross-correlated ore grades and one categorical variable(i.e.,geological domains)with soft contact relationships that exist among the geological domains is *** statistical and geostatistical tools are provided for variogram inference,Gibbs sampling,and conditional *** algorithm is also tested by applying it to a Cu deposit,where the geological formations are managed by the local and spatial distribution of two cross-correlated ore grades,Cu and Au,throughout the *** results show that the proposed algorithm outperforms other geostatistical techniques in terms of global and local reproduction of statistical parameters.

关键词： geostatistical simulation categorical variable continuous variable geological domain variogram inference

Regularity classification and corresponding analysis method requirements of horizontally curved bridges with unequal pier heights

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Earthquake Engineering and Engineering Vibration 2023年第2期22卷 549-571页

作者： mohammad Jalal maleki-amin Shahrokh Maalek School of Civil Engineering Tehran UniversityTehran 11155-4563Iran Iranian Bridge Engineering Association Tehran 36481684Iran

The seismic behavior of horizontally curved bridges,particularly with unequal height piers,is more complicated than that of straight bridges due to their geometric *** this study,the seismic responses of several horizontally curved single-column-bent viaducts with various degrees of curvature and different pier heights have been investigated,employing three different analysis approaches:namely,modal pushover analysis,uniform load method,and nonlinear time history *** the investigated bridge configurations and utilizing the most common regularity indices,the results indicate that viaducts with 45-degree and 90-degree deck subtended angles can be categorized as regular and moderately irregular,respectively,while the bridges with 180-degree deck subtended angle are found to be highly ***,the viaducts whose pier heights are asymmetric may be considered as irregular for almost all ranges of the deck subtended *** effects of higher transverse and longitudinal modes are discussed and the minimum analysis requirements are identified to assess the seismic response of such bridge configurations for design *** the Regularity Indices used here are useful tools to distinguish between regular and irregular bridges,further studies are needed to improve their reliability.

关键词： horizontally curved bridges unequal height piers pushover analysis regularity index seismic analysis and response

Healthcare utilization patterns and economic burden of animal bites:A cross-sectional study

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Journal of Acute Disease 2021年第4期10卷 142-146页

作者： Vahid Bay Aziz Rezapour Mehdi Jafari mohammad Reza maleki Irvan Masoudi Asl Department of Healthcare Services Management School of Health Management&Information SciencesIran University of Medical SciencesTehranIran Infectious Diseases Research Centre Golestan University of Medical SciencesGorganGolestanIran Health Management and Economics Research Center Health Management Research InstituteIran University of Medical SciencesTehranIran

Objective:To determine the healthcare utilization patterns and estimate the economic burden of animal bites in Golestan province,north part of ***:This cross-sectional study was performed based on the data of 12181 animal-bite patients from Golestan province who were referred to the rabies prophylaxis centers between March 2019 and March *** study was a societal perspective,and all patients were investigated by census *** micro-costing method with a bottom-up approach as well as the human capital approach were used to estimate the economic ***:In our study,the economic burden caused by animal bites was estimated at$1383639(275354672060 Rials).The largest share of costs was related to direct healthcare costs,direct non-healthcare costs,and indirect costs accouting for 91%,5%,and 4%,*** addition,the average cost of a animal-bite patient was estimated at$113.5(22605260 Rials)(The average cost of a case in type 2 and 3 exposures was$45 and$412.8,respectively).The largest share of direct healthcare costs was related to immunoglobulin,vaccine,and personnel expenses accounting for 61.3%,19.8%,and 11.65%,***:Our study shows that animal bites in Golestan province,north of Iran impose a high economic burden on the communities,especially the healthcare system,which indicates the need to review management and control programs of animal bites and rabies based on animal-bite patterns of the area.

关键词： Animal bites Rabies Economic burden

Normal faulting and its role in the drainage divide migration in the Karιncalιdag region,Menderes Massif,Western Türkiye

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Journal of Mountain Science 2025年第1期22卷 312-323页

作者： TOPAL Savaş IRFAN mohammad Pamukkale University Department of Geological EngineeringKınıklıCampusDenizli 20160Türkiye University of Kashmir Department of Earth SciencesSrinagar 190006India

Drainage divide migration refers to the shifting boundaries between adjacent drainage basins over time,driven by processes such as tectonic uplift,differential erosion,stream capture,and lithological *** phenomenon has a significant impact on water flow patterns and basin extents,serving as an indicator of the landscape's response to active tectonic *** of the key drivers of divide migration is asymmetric uplift,which causes divides to shift from areas of lower uplift to regions experiencing higher *** divides are inherently dynamic,evolving over time as drainage networks develop and adjust to changing *** study focuses on the migration of the main drainage divide along Karιncalιda?,located between Bozdo?an and *** employs geomorphic analyses using metrics such as the normalized steepness index(ksn),Chi(χ),and Gilbert *** main divide is categorized into four segments(D1–D4),with the Karacasu Fault,situated along the mountain's north-eastern boundary,identified as the primary factor influencing divide *** factors include the relatively low elevation of Karιncalιda?,uniform lithology,and consistent rainfall patterns across the *** results indicate that the main divide is currently stable,suggesting a balance between uplift and ***,higherχvalues in the D4 segment suggest that future erosion may dominate,potentially causing the divide to migrate toward the Bozdo?an *** findings highlight the dynamic nature of drainage divides and the complex interplay of tectonic,erosional,and lithological processes that shape their *** monitoring and advanced geomorphic analysis are essential for understanding the long-term stability of the divide and its response to future tectonic activity and erosional modifications.

关键词： Drainage divide migration Gilbert metrics Karıncalıdağ Karacasu Fault

Geochemical analysis of organic matter associated with gold in ore deposits:A study of Kazakhstan and Hungary

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Acta Geochimica 2025年第1期44卷 23-35页

作者： Medet Junussov Asif mohammad Sotirios Longinos School of Mining and Geosciences Nazarbayev University010000AstanaKazakhstan

This study comprises the relationship between organic matter(OM)and gold occurrence using two distinctive ore deposits of the Bakyrchik gold-sulfide deposit(Kazakhstan)and Western Mecsek uranium ore deposit(Hungary).The two ore deposits are identified as organicrich sedimentary formations linked to the Variscan gold cycle *** OM is essential because it can act as a carrier for gold,influencing its distribution and behavior within the *** the nature and distribution of OM can provide insights into the processes of gold deposition and help optimize exploration and extraction strategies in mining *** primary objective is to characterize OM by identifying its elemental composition,thermal maturity,functional groups,and soluble fractions;and extract gold from OM using a two-step sequential extraction method(hydrogen peroxide and aqua regia)combined with geochemical *** and experimental results from samples of both ore deposits indicate the presence of finely disseminated solid bitumen and reworked vitrinite,originating from thermally matured(RmcRo%—3.76 in Bakyrchik;Ro%—2.25 in W-Mecsek)terrigenous high *** deposits exhibit extremely low extractable bitumen yield and TOC(0.34%in Bakyrchik;0.25 wt%in W-Mecsek),characterized by an aromatic carboxylic acid organic structure and a composition rich in sulfur-containing(1.17%in Bakyrchik;5.81%in W-Mecsek)aromatic *** occurrence and enrichment within OM were confi rmed through the sequential extraction method employing ICP-OES and LA-ICP-MS *** sequentially extracted gold content from OM reached up to 3 ppm in Bakyrchik and up to 3.28 ppm in Western Mecsek,accompanied by Ag(ranging from 0.01 to 0.32 ppm).Higher concentrations of Au(4 ppm)and Ag(27 ppm)were extracted from residue materials,which are likely associated with sulfide *** presence of gold in OM was further validated using *** bonding within OM struc

关键词： Bakyrchik Western Mecsek Solid bitumen Reworked vitrinite Gold

Promising effects of Persian shallot extract on the serum markers and blood pressure of patients with metabolic syndrome:a double-blinded randomized controlled trial

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Journal of Traditional Chinese Medicine 2025年第1期45卷 100-106页

作者： Neda Naimipoor Zahra Bagheri-Hosseinabadi mohammad Reza Hajizadeh Mitra Abbasifard mohammad Reza Mirzaei Akram Ghadiri Anari Maryam mohammad-Sadeghipour Mehdi Mahmoodi Department of Clinical Biochemistry School of MedicineRafsanjan University of Medical Sciences Department of Internal Medicine School of MedicineAli-Ibn Abi-Talib HospitalRafsanjan University of Medical Sciences Molecular Medicine Research Center Research Institute of Basic Medical SciencesRafsanjan University of Medical Sciences Diabetes Research Center Shahid Sadoughi University of Medical Sciences Department of Clinical Biochemistry Afzalipour School of MedicineKerman University of Medical Sciences Physiology Research Center Institute of NeuropharmacologyKerman University of Medical Sciences

OBJECTIVE: To evaluate the effect of Persian shallot extract on the serum markers and blood pressure of patients with metabolic syndrome(MetS). METHODS: Fifty patients with Met S diagnosis were randomly assigned to the intervention(Persian shallot extract) and the control(placebo) group. Both groups received treatment for three months. Before the study and at the end of the study, 5 mL peripheral blood was taken from each patient. The measured factors included total antioxidant capacity(TAC), superoxide dismutase enzyme(SOD), malondialdehyde, oxidized low-density lipoprotein(Ox-LDL), apolipoprotein H(Apo-H), fasting blood glucose(FBS), total cholesterol, triglycerides, high-density lipoprotein(HDL), LDL, and systolic and diastolic blood pressure. RESULTS: At baseline, the evaluated parameters were not significantly different between the intervention and control groups. At the end of the study, the mean serum levels of malondialdehyde and ox-LDL were significantly lower in the intervention group. The mean FBS, cholesterol, triglycerides, and LDL were significantly lower in the intervention group. The mean TAC and HDL were significantly higher in the intervention group(P < 0.05). Moreover, the intervention group significantly reduced systolic and diastolic blood pressure. No other significant association was observed. CONCLUSION: Persian shallot extract has several beneficial effects in Met S patients, including optimizing oxidative balance, reducing blood pressure, fasting blood sugar, and blood lipid profile.

关键词： antioxidants medicine, Persian metabolic syndrome shallots

Rainfall-induced wind erosion in soils stabilized with alkali-activated waste materials

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 465-480页

作者： Alireza Komaei Abbas Soroush Seyed mohammad Fattahi Hesam Ghanbari Department of Civil and Environmental Engineering Amirkabir University of TechnologyTehran159163431Iran

This study evaluates the efficacy of sustainable erosion control using slag-based alkali-activated cement crusts under varying rainfall and wind conditions. The rainfall intensities ranged from 30 mm/h to 120 mm/h, with durations ranging from 15 min to 90 min, and crust slopes of ∼2° (gentle) and 30° (steep). Wind tunnel experiments were conducted at wind velocities of 14 m/s, 21 m/s, and 28 m/s to investigate post-rainfall wind erodibility, along with changes in crust strength and microstructure analysis. The findings show the development of hydrated cementitious phases in alkali-activated material, which form around and between the particles during the alkaline activation process. Alkali-activated cement crusts significantly reduced erosion caused by rainfall and subsequent wind by several orders of magnitude. At the highest rainfall intensity of 120 mm/h, rainfall erosion was measured to be 1654.81 kg/m2 for untreated samples and 0.89 kg/m2 for treated samples, demonstrating a substantial 99.95% reduction in erosion due to the treatment. Similarly, at the highest wind speed tested, wind erosion was 122.75 kg/m2 for untreated samples and 0.095 kg/m2 for treated samples, indicating a significant 99.92% reduction in erosion due to the formation of an alkali-activated cement crust on the soil surface. However, exposure of the samples to 120 mm/h rainfall for 90 min resulted in a 5.2-fold increase in wind erosion compared to pre-rainfall conditions. Similarly, penetrometer results indicated a 37%–54% reduction in post-rainfall surface strength.

关键词： Rainfall erosion Alkali-activated material Wind erosion Crust formation

Transesterification of canola oil over Li/Ca-La mixed oxide catalyst:Kinetics and calcination temperature investigations

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燃料化学学报 2017年第4期45卷 442-448页

作者： Hesam maleki mohammad Kazemeini Department of Chemical and Petroleum Engineering Sharif University of Technology

In this research,a solid 1%Li/Ca-La mixed oxide catalyst was prepared using co-precipitation method followed by wet *** prepared catalyst was used in the transesterification reaction of canola oil and methanol for biodiesel *** effects of calcination and reaction temperatures were investigated on the activity of the *** addition,rate of the reaction was studied through a kinetic model for which parameters were *** properties and structure of the catalyst were characterized through the powder X-ray diffraction(XRD),thermogravimetry/derivative thermogravimetry(TG/DTG),and Fourier transform infrared spectroscopy *** these emphasized that the performance of the catalyst corresponded to the generation of the active sites and their thermal activation.

关键词：油共炼基团相对含量固体残渣干基无灰转化率

Retinal capillary density among healthy Egyptian and South Asian students:an optical coherence tomography angiography study

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International Journal of Ophthalmology(English edition) 2025年第1期18卷 111-116页

作者： Abdussalam M Abdullatif Alimulhaq mohammad Moamnlhaq Tamer A.Macky Noha Ahmed Edris Department of Ophthalmology Kasr ElAini HospitalCairo UniversityCairo 1141Egypt

AIM:To compare the macular and optic nerve perfusion and vascular architecture using optical coherence tomography angiography(OCTA)in normal eyes of Egyptian(Caucasians)and South Asian(Asians)***:Cross-sectional analytical OCTA study performed on 90 eyes of South Asian(n=45)and Egyptians(n=45)were *** participants underwent bestcorrected visual acuity test,slit lamp,and fundus *** images;macular 6×6 mm^(2) grid and optic nerve 4.5×4.5 mm^(2) grid were used to examine the parafoveal and peripapillary regions,***:The mean capillary vessel density(CVD)in macular sectors among South Asians and Egyptians participants were(50.31%±2.53%,51.2%±5.93%)and(49.71%±3.6%,51.94%±4.79%)in superficial(SCP)and deep capillary plexuses(DCP),respectively(P>0.05).Mean CVD in both groups was higher in DCP compared to SCP in all sectors but was not significant(P>0.05).Mean foveal CVD increases with an increase in central retinal thickness in both SCP and DCP(P<0.001),among both *** area of the foveal avascular zone(FAZ)was 0.28±0.09 and 0.27±0.08 mm2 in South Asian and Egyptians,*** area decreases with an increase in the thickness and foveal CVD(P<0.001).Mean CVD in the peripapillary area was 48.23%±5.78% in South Asian and 49.52%±2.38% in Egyptian *** mean retinal nerve fiber layer thickness was found to be higher in the nasal quadrant among South Asian females than the Egyptian females(P<0.05).CONCLUSION:No significant racial disparity is found in this *** findings are helpful for assessing and improving the normative data on the differences in South Asian and Egyptian populations.

关键词： South Asian Egyptian optical coherence tomography angiography macular perfusion peripapillary vessel flow density