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Advancing sandstone reservoir compressibility prediction:A correlation-driven methodology

Petroleum Research 2024年第2期9卷 273-279页

作者： Tarek Ganat Meftah Hrairi Amr Badawy vahid khosravi Mohammed Abdalla Department of Petroleum Chemical Engineering Sultan Qaboos UniversityP.O.Box 50Al-Khod123MuscatOman Department of Mechanical and Aerospace Engineering International Islamic University MalaysiaP.O.Box 1050728Kuala LumpurMalaysia Reservoir Engineering Section Petronas Carigali SDN BHDP.O.Box 10500088Kuala LumpurMalaysia Department of Chemical and Petroleum Engineering Faculty of EngineeringTechnologyand Built EnvironmentUCSI University56000Kuala LumpurMalaysia Chemical&Petroleum Engineering United Arab Emirates UniversityP.O.Box No.15551Al AinUAE

This study presents a correlation-based approach for predicting the compressibility of sandstone reservoir *** study proposes a matrix of new empirical equations that significantly improve the precision of measuring the pore volume compressibility,with the most optimal fit of results based on a cubic polynomial *** accuracy of the calculations was validated through comparison with actual data using root mean square method,and the suggested correlations significantly enhance the precise prediction of rock compressibility in sandstone *** this study,the source of data collection is consolidated and unconsolidated sandstone from East Asia offshore ***,variations in compressibility with net overburden pressure over the course of the field's lifespan have been *** results demonstrate the application of regression analysis in establishing a network of linkages between independent and dependent *** proposed correlations for consolidated and unconsolidated sandstones offer a remarkable improvement in the accurate calculation of rock compressibility compared to traditional laboratory procedures,with an average error of 2.5%compared to 5-10%for laboratory *** approach of this study offers a cost-effective and time-efficient alternative to remarkedly enhance the overall performance of sandstone reservoirs in the oil and gas industry.

关键词： Compressibility Consolidated and unconsolidated sandstone Rock properties Rock mechanics

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Diversity of woody plant species and their relationship to physiographic factors in central Zagros forests (Case study： Perc forest, Khorramabad, Iran)

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Journal of Forestry Research 2016年第5期27卷 1137-1141页

作者： Ramin Hosseinzadeh Javad Soosani vahid Aiijani Sheyda khosravi Hamdieh Karimikia Department of Forestry Agriculture Faculty Lorestan University Lorestan Iran Natural Resources Faculty Tehran University Tehran Iran Kurdistan University Sanandaj Iran

Topography is the most factor that has the greatest impact of all factor that affect the distribution. To study the diversity of trees and shrub species in the Perc forest situated in Khorramabad, Lorestan, 140 circular plots of 1200 m2 in a grid of 300 m × 250 m were surveyed, using a systematic random sampling method. In each plot, the Margalef richness index, Shannon-Wiener diversity index, Hill＇s N1 and Simpson indices and the evenness index of Simpson and Smith-Wilson were calculated and ordered on the basis of different classes of elevation, exposition and slope. The results indicated that slope did not have any significant effect on the indices. Exposition and elevation classes significant impacted the richness and diversity indices, but did not influence evenness. In general, the highest plant diversity was observed for slopes less than 15 %, northern aspects, without geographical direction, and elevations of 2100-2200 m. This information can be very useful in achieving the goals for sustainable management of forests. In addition to greater protection for regions with high diversity and reforestation （compatible species） in degraded area, we can help increase diversity in forests.

关键词： Plant diversity Richness Evenness Physiography Zagros

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Preparation of CO2 selective composite membranes using Pebax/CuBTC/PEG-ran-PPG ternary system

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Journal of Energy Chemistry 2017年第3期26卷 530-539页

作者： Tayebeh khosravi Mohammadreza Omidkhah Faculty of Chemical Engineering Tarbiat Modares UniversityP.O.Box 14115-143TehranIran

Three phase PebaxMH 1657/PEG-ran-PPG/CuBTC（polymer/liquid/solid） was successfully deposited as a selective layer on a porous Polysulfone（PSF） support. In fact, the beneficial properties of PEG（high selectivity） with those of PPG（high permeability, amorphous） have been combined with superior properties of mixed matrix membrane（MMMs）. The membranes were characterized by DSC, TGA and SEM, while CuBTC was characterized by COand CHadsorption test. Statistically based experimental design（central composite design, CCD） was applied to analyze and optimize the effect of PEG-ran-PPG（10–50 wt%） and CuBTC（0–20 wt%） mass contents on the COpermeance and CO/CHideal selectivity. Based on the regression coefficients of the obtained models, the COpermeance was notably influenced by PEG-ran-PPG,while CuBTC has the most significant effect on the CO/CHideal selectivity. Under the optimum conditions（PEG-ran-PPG: 32.76 wt% and CuBTC: 20 wt%）, nearly 620% increase in the COpermeance and43% enhancement in the CO/CHideal selectivity was observed compared to the neat Pebax. The effect of pressure（3, 9 and 15 bar） on the pure and mixed gas separation performance of the composite membranes was also investigated. The high solubility of COin the membranes resulted in the enhancement of COpermeability with increase in gas pressure.

关键词： CO2 separation Pebax Composite membrane CuBTC PEG-ran-PPG

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Mobile Multimedia Computing in Cyber-Physical Surveillance Services Through UAV-Borne Video-SAR:A Taxonomy of Intelligent Data Processing for IoMT-Enabled Radar Sensor Networks

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Tsinghua Science and Technology 2022年第2期27卷 288-302页

作者： Mohammad R.khosravi Sadegh Samadi Department of Electrical and Electronics Engineering Shiraz University of TechnologyShiraz 313-71555Iran

This study investigates the different aspects of multimedia computing in Video Synthetic Aperture Radar(Video-SAR)as a new mode of radar imaging for real-time remote sensing and *** research also considers new suggestions in the systematic design,research taxonomy,and future trends of radar data *** the conventional modes of SAR imaging,Video-SAR can generate video sequences to obtain online monitoring and green surveillance throughout the day and night(regardless of light sources)in all ***,an introduction to Video-SAR is ***,some specific properties of this imaging mode are ***,this research covers one of the most important aspects of the Video-SAR systems,namely,the systematic design requirements,and also some new types of visual distortions which are different from the distortions,artifacts and noises observed in the conventional imaging *** addition,some topics on the general features and high-performance computing of Video-SAR towards radar communications through Unmanned Aerial Vehicle(UAV)platforms,Internet of Multimedia Things(IoMT),Video-SAR data processing issues,and real-world applications are investigated.

关键词： Video Synthetic Aperture Radar(Video-SAR)imaging radar networks radar image processing high-performance computing Internet of Multimedia Things(IoMT) cybersecurity

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Undrained seismic bearing capacity of strip footing adjacent to a heterogeneous excavation

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Frontiers of Structural and Civil Engineering 2023年第4期17卷 566-583页

作者： Ramin VALI Saeed khosravi Majid BEYGI Department of Civil Engineering Technical and Vocational UniversityTehran ***Iran Department of Mining Engineering Shahid Bahonar University of KermanKerman ***Iran Department of Civil Engineering Yazd UniversityYazd ***Iran

The analysis of the bearing capacity of strip footings sited near an excavation is critical in *** this study,the effects of the geometrical features of the excavation and the soil strength properties on the seismic bearing capacity of a strip footing resting on an excavation were evaluated using the lower and upper bounds of the finite element limit analysis *** effects of the setback distance ratio(L/B),excavation height ratio(H/B),soil strength heterogeneity(kB/cu),and horizontal earthquake coefficient(kh)were *** charts and tables were produced to clarify the relationship between the undrained seismic bearing capacity and the selected parameters.

关键词： excavation finite element limit analysis heterogeneous soil strip footing undrained bearing capacity

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Evaluation of restoration success in arid rangelands of Iran based on the variation of ecosystem services

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Journal of Arid Land 2023年第11期15卷 1290-1314页

作者： Mohsen SHARAFATMANDRAD Azam khosravi MASHIZI Department of Ecological Engineering Faculty of Natural ResourcesUniversity of JiroftJiroft ***Iran

The plantation of non-native species is one of the most expensive ecological restoration measures in arid and semi-arid areas,while its impacts on local communities are largely *** study assessed the rate of change and the dynamic degree of the economic values of ecosystem services related to local conservation(water yield,stocking rate and aesthetic value)and preserving the future(carbon sequestration,soil protection,soil stability and habitat provision)to determine the restoration success of the plantation of non-native species Haloxylon ammodendron(***.)Bunge ex Fenzl(15-and 30-year-old)in parts of arid rangelands of Bardsir region,Kerman Province,*** investigated the impacts of the two plantations on the seven ecosystem services and ecosystem structures(horizontal and vertical structures,vegetation composition and species diversity)based on field sampling and measurements at four sampling sites(i.e.,control,degraded,and 15-and 30-year-old plantation sites)in spring and summer of *** restoration success of the plantation of non-native species was then examined by assessing the rate of change and the dynamic degree of the total economic value of all ecosystem services as well as the rate of change and the dynamic degree of the economic values of ecosystem services for the two groups(local conservation and preserving the future).Although the plantation of non-native species *** enormously improved the vertical and horizontal structures of ecosystems,it failed to increase species diversity and richness ***,despite the plantation of non-native species *** had significantly increased the economic values of all ecosystem services,it was only quite successful in restoring carbon *** analysis showed that plantation age had a significant impact on restoration success directly and indirectly(through changing ecosystem structures and services).The dynamic degree of the economic values of ecosystem services r

关键词： Haloxylon ammodendron restoration success ecosystem services ecosystem structures arid ecosystems path analysis Iran

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Autonomous fault-diagnosis and decision-making algorithm for determining faulty nodes in distributed wireless networks

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Frontiers of Information Technology & Electronic Engineering 2016年第9期17卷 885-896页

作者： Adel khosravi Yousef SEIFI KAVIAN Electrical Engineering Department Faculty of Engineering Shahid Chamran University of Ahvaz

In this paper, we address fault-diagnosis agreement(FDA) problems in distributed wireless networks(DWNs) with arbitrary fallible nodes and healthy access points. We propose a new algorithm to reach an agreement among fault-free members about the faulty ones. The algorithm is designed for fully connected DWN and can also be easily adapted to partially connected networks. Our contribution is to reduce the bit complexity of the Byzantine agreement process by detecting the same list of faulty units in all fault-free members. Therefore, the malicious units can be removed from other consensus processes. Also, each healthy unit detects a local list of malicious units, which results in lower packet transmissions in the network. Our proposed algorithm solves FDA problems in 2t+1 rounds of packet transmissions, and the bit complexity in each wireless node is O(nt+1).

关键词： Fault diagnosis Decision making Byzantine agreement Distributed wireless networks Consensus

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Plant community dynamics in arid lands: the role of desert ants

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Journal of Arid Land 2021年第3期13卷 303-316页

作者： Mohsen SHARAFATMANDRAD Azam khosravi MASHIZI Department of Ecological Engineering Faculty of Natural ResourcesUniversity of JiroftJiroft ***Iran

Ants (Formicidae, Hymenoptera) play an important role in seed bank, seedling establishment andplant composition of arid ecosystems. Thus, knowing plant-ant interaction provides useful information formanagers to design restoration and conservation plans. In this study, the roles of desert harvester ants (Messorintermedius and Messor melancholicus) and scavenger ants (Cataglyphis nodus and Lepisiota semenovi) on plantcommunities were investigated in arid ecosystems of southeastern Iran. Two vegetation types weredistinguished in the study area and the nest density of ant species was determined. Furthermore, plantcomposition and soil seed bank were estimated at different distances from the ant nests. Results showed thatthe density of M. intermedius and M. melancholicus nests was higher in dwarf shrub-shrub vegetation type and thedensity of C. nodus and L. semenovi nests was higher in dwarf shrub vegetation type. The harvester and scavengerants had enhanced the seed bank to 55% and 70%, respectively. Therefore, the role of scavenger ants on theplant communities' seed bank was greater than that of harvester ants. Although the scavenger ants were moreinfluential on the annuals and the invasive plant species, the radius impact of the harvester ants on theperennials was greater, i.e., a positive interaction existed between the perennial plants and the harvester ants. *** and L. semenovi played an important role in enhancing the ecosystem's potential for restoration throughestablishment of pioneer species in early stage of succession. The activity of M. intermedius is crucial for thedevelopment and maintenance of climax plant communities in arid ecosystems through assisting the plantspecies' establishment in late stage of succession. It is essential to preserve the diversity of these key ant speciesfor the maintenance and sustainability of shrubs in arid ecosystems.

关键词： ants ecological succession ecosystem rangelands shrubs vegetation

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Green,mild and efficient bromination of aromatic compounds by HBr promoted by trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane in water as a solvent

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Chinese Chemical Letters 2012年第4期23卷 387-390页

作者： Kaveh khosravi Samira Kazemi Department of Chemistry Faculty of ScienceUniversity of Arak Department of Chemistry Shahr-e-Rey branchIslamic Azad University

A combination of HBr and trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane as anew and powerful oxidant was found effective for facile brotnination of different aromatic compounds at room temperature in water as a green *** reaction conditions,high selectivity and yield,high reaction rate and non-toxicity are some of the major advantages of this synthetic protocol.

关键词： Trans-3 5-dihydroperoxy-3 5-dimethyl-1 2-dioxolane HBr Bromination Anilines Phenoles

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CHARACTEIZATIONS OF WOVENT g-FRAMES AND WEAVING g-FRAMES IN HILBERT SPACESS AND C^(*)-MODULES

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Acta Mathematica Scientia 2023年第6期43卷 2471-2482页

作者： Amir khosravi Mohammad Reza FARMANI Faculty of Mathematical Sciences and Computer Kharazmi University599 Taleghani Ave.Tehran 15618Iran

In this paper,using Parseval frames we generalize Sun’s results to g-frames in Hilbert C^(*)-***,for g-frames in Hilbert spaces,we present some characterizations in terms of a family of frames,not only for orthonormal ***,we have a note about a comment and a relation in the proof of Proposition 5.3 in[*** et al.,On weaving g-frames for Hilbert spaces,Complex Analysis and Operator Theory,2020].Finally,we have some results for g-Riesz bases,woven and P-woven g-frames.

关键词： g-frame fusion frame woven frame Riesz basis g-Riesz basis

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