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Reliability analysis of production schedule in multi-element deposits under grade-tonnage uncertainty with multi-destinations for the run of mine material

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International Journal of Mining Science and Technology 2019年第3期29卷 483-489页

作者： Mohsen Jamshidi morteza Osanloo Department of Mining and Metallurgical Engineering Amirkabir University of Technology

Blending contributes to create an opportunity to achieve the target feed material and helps optimize the run of mine(ROM)*** addition,it allows mixing different materials and achieving a wide range of ***,multiple destinations can be considered for *** present study seeks to develop a Mixed Integer Programming(MIP)model for the production scheduling of an iron ore *** on this model,different destinations are considered for mine products with different *** this aim,ten scenarios were considered with a number of different *** results indicated that the maximum NPV in the multiple product scenarios is about 15%more than that of the single product ***,30 realizations were used to evaluate the effect of grade and tonnage *** reliability of the production plan was approximately 61.07%and 62.81%in the first and second period of exploitation,respectively.

关键词： Production Blending Multiple products Reliability Mixed Integer Programming model

Directional power absorption in helicon plasma sources excited by a half-helix antenna

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Plasma Science and Technology 2017年第10期19卷 35-43页

作者： Mohsen AFSHARMANESH morteza HABIBI Department of Energy Engineering and Physics Amirkabir University of Technology

This paper deals with the investigation of the power absorption in helicon plasma excited through a half-helix antenna driven at 13.56 MHz. The simulations were carried out by means of a code,HELIC. They were carried out by taking into account different inhomogeneous radial density profiles and for a wide range of plasma densities, from 10^（11） cm^（-3） to 10^（13） cm^（-3）. The magnetic field was 200, 400, 600 and 1000 G. A three-parameter function was used for generating various density profiles with different volume gradients, edge gradients and density widths. The density profile had a large effect on the efficient Trivelpiece–Gould（TG） and helicon mode excitation and antenna coupling to the plasma. The fraction of power deposition via the TG mode was extremely dependent on the plasma density near the plasma boundary. Interestingly, the obtained efficient parallel helicon wavelength was close to the anticipated value for Gaussian radial density *** deposition was considerably asymmetric when the n/B_0 ratio was more than a specific value for a determined density width. The longitudinal power absorption was symmetric at approximately n_0 =10^（11） cm^（-3）, irrespective of the magnetic field supposed. The asymmetry became more pronounced when the plasma density was 10^（12） cm^（-3）. The ratio of density width to the magnetic field was an important parameter in the power coupling. At high magnetic fields, the maximum of the power absorption was reached at higher plasma density widths. There was at least one combination of the plasma density, magnetic field and density width for which the RF power deposition at both side of the tube reached its maximum value.

关键词： helicon plasma half-helix antenna asymmetric power absorption density profile HELIC code

Insights into Theranostic Properties of Titanium Dioxide for Nanomedicine

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Nano-Micro Letters 2020年第2期12卷 102-136页

作者： morteza Hasanzadeh Kafshgari Wolfgang HGoldmann Department of Engineering Physics Polytechnique MontreálMontrealQC H3C3A7Canada Department of Physics Biophysics GroupUniversity of Erlangen-Nuremberg91052 ErlangenGermany

Titanium dioxide(TiO2)nanostructures exhibit a broad range of theranostic properties that make them attractive for biomedical ***2 nanostructures promise to improve current theranostic strategies by leveraging the enhanced quantum confinement,thermal conversion,specific surface area,and surface *** review highlights certain important aspects of fabrication strategies,which are employed to generate multifunctional TiO2 nanostructures,while outlining post-fabrication techniques with an emphasis on their suitability for *** biodistribution,toxicity,biocompatibility,cellular adhesion,and endocytosis of these nanostructures,when exposed to biological microenvironments,are examined in regard to their geometry,size,and surface *** final section focuses on recent biomedical applications of TiO2 nanostructures,specifically evaluating therapeutic delivery,photodynamic and sonodynamic therapy,bioimaging,biosensing,tissue regeneration,as well as chronic wound healing.

关键词： TiO2 nanostructures Drug delivery systems Bioimaging Biosensing Tissue regeneration

A capillary force model for interactions between two spheres

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Particuology 2011年第4期9卷 381-386页

作者： Amir Farrokh Payam morteza Fathipour Nano-Electronics Center of Excellence School of Electrical & Computer Engineering Faculty of Engineering University of Tehran

Based on the method of energy principle, an analytical approach for computing the capillary force for sphere/sphere geometry is presented in this paper. In modeling the capillary force, we consider spheres with both equal and non-equal radii, for both symmetric and asymmetric configurations at liquid/solid interfaces. We use numerical analysis to investigate the validity and efficiency of the derived model. The effect of various parameters including humidity, distance between two spheres, radii of spheres and contact angles on the meniscus force are investigated. Finally the results obtained from the model are compared with experimental measurements, and the accuracy and precision of the presented approach is verified.

关键词： Interaction Capillary force Humidity Energy methods Sphere particle

Performance improvement of a crumb rubber modified bitumen using recycled glass powder

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第11期14卷 805-814页

作者： Mojtaba GHASEMI Seyed morteza MARANDI Department of Civil Engineering Shahid Bahonar UniversityKerman 761691 4111 Iran

In this study, the efficiency of bitumen and asphalt mixtures modified with crumb rubber(CR) and recycled glass powder(RGP) is evaluated. From an environmental point of view, the application of RGP in asphalt mixtures is considered beneficial since it prevents accumulation of waste glass in the natural environment. Rheological and mechanical properties of modified bitumen samples were investigated by laboratory methods such as bitumen conventional tests and dynamic shear rheometer(DSR), and also by asphalt mixture performance tests including Marshall stability, indirect tensile strength(ITS),compressive strength, and indirect tensile stiffness modulus. The results showed that the application of RGP in place of CR has no negative impact on the efficiency of bitumen and asphalt mixtures and even improves their engineering properties except for the toughness index(TI). Moreover, a modification with 5% CR and 5% RGP in asphalt mixtures results in the best overall performance.

关键词： Crumb rubber (CR) Recycled glass powder (PGP) Rheological properties Performance testing Stone matrixasohalt (SMA)

Modeling of unconfined compressive strength of soil-RAP blend stabilized with Portland cement using multivariate adaptive regression spline

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Frontiers of Structural and Civil Engineering 2019年第4期13卷 787-799页

作者： Ali Reza GHANIZADEH morteza RAHROVAN Department of Civil Engineering Sirjan University of Technology Sirjan 78137-33385 Iran Department of Civil Engineering Yazd University Yazd 89195-741 Iran

The recycled layer in full-depth reclamation (FDR) method is a mixture of coarse aggregates and reclaimed asphalt pavement (RAP) which is stabilized by a stabilizer agent. For design and quality control of the final product in FDR method, the unconfined compressive strength of stabilized material should be known. This paper aims to develop a mathematical model for predicting the unconfined compressive strength (UCS) of soil-RAP blend stabilized with Portland cement based on multivariate adaptive regression spline (MARS). To this end, two different aggregate materials were mixed with different percentages of RAP and then stabilized by different percentages of Portland cement. For training and testing of MARS model, total of 64 experimental UCS data were employed. Predictors or independent variables in the developed model are percentage of RAP, percentage of cement, optimum moisture content, percent passing of #200 sieve, and curing time. The results demonstrate that MARS has a great ability for prediction of the UCS in case of soil-RAP blend stabilized with Portland cement (R2 is more than 0.97). Sensitivity analysis of the proposed model showed that the cement, optimum moisture content, and percent passing of #200 sieve are the most influential parameters on the UCS of FDR layer.

关键词： full-depth reclamation soil-reclaimed asphalt pavement blend Portland cement unconfined compressive strength multivariate adaptive regression spline

Simultaneous Placement of Tie-lines and Distributed Generations to Optimize Distribution System Post-outage Operations and Minimize Energy Losses

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CSEE Journal of Power and Energy Systems 2021年第2期7卷 318-328页

作者： Farzaneh Shojaei Mohammad Rastegar morteza Dabbaghjamanesh Department of Power and Control Engineering School of Electrical and Computer EngineeringShiraz UniversityShirazIran Electrical and Computer Engineering Department The University of Texas at DallasUSA.

This study proposes a new method which aims to optimally install tie-lines and distributed generations *** is done to optimize the post-outage reconfiguration and minimize energy losses and energy not supplied of distribution *** number and location of tie-lines,as well as the number,size,and location of DGs,are pinpointed through teaching the learning-based optimization(TLBO)*** objective function in the current research is to minimize the costs pertaining to the investment,operation,energy losses,and energies not *** addition to the normal operational condition,fault operational condition is also ***,the optimal post-fault reconfigurations for fault occurrences in all lines are ***,the operational constraints such as the voltage and line current limits are taken into account in both normal and post-fault operational ***,the modified IEEE 33-bus and 69-bus distribution test systems are selected and tested to demonstrate the effectiveness of the simultaneous placement of DGs and tie-line technique proposed in this paper.

关键词： Distribution system reliability distributed generation energy loss post-outage reconfiguration tie-lines

Cement-bonded particleboard with a mixture of wheat straw and poplar wood

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Journal of Forestry Research 2013年第2期24卷 381-390页

作者： morteza Nazerian Vajiihe Sadeghiipanah Department of Wood and Paper Science and Technology University of Zabol

We investigated the hydration behavior and some physical/mechanical properties of cement-bonded particleboard （CBPB） containing particles of wheat straw and poplar wood at various usage ratios and bonded with Portland cement mixed with different levels of inorganic additives. We determined the setting time and compression strength of cement pastes containing different additives and particles, and studied the effects of these additives and particles on thickness swelling, internal bond strength and modulus of rupture of CBPB by using RSM （Response Surface Methodology）. The mathematical model equations （second-order response functions） were derived to optimize properties of CBPB by computer simulation programming. Predicted values were in agreement with experimental values （R2 values of 0.93, 0.96 and 0.96 for TS, IB and MOR, respectively）. RSM can be efficiently applied to model panel properties. The variables can affect the properties of panels. The cement composites with bending strength 〉 12.5 MPa and internal bond strength 〉 0.28 MPa can be made by using wheat straw as a reinforcing material. Straw particle usage up to 11.5% in the mixture satisfies the minimum requirements of International Standard, EN 312 （2003） for IB and MOR. The dose of 4.95% calcium chloride, by weight of cement, can improve mechanical properties of the panels at the minimum requirement of EN 312. By increasing straw content from 0 to 30%, TS was reduced by increasing straw particle usage up to 1.5% and with 5.54% calcium chloride in the mixture, TS satisfied the EN 312 standard.

关键词： cement-bonded particleboard wheat straw poplar additives setting time physical and mechanical properties

Evolving Hoava cosmological horizons

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Chinese Physics C 2016年第9期40卷 63-74页

作者： Mohsen Fathi morteza Mohseni Department of Physics Payame Noor University(PNU)P.O.Box 19395—3697 TehranI R.of Iran

Several sets of radially propagating null congruence generators are exploited in order to form 3-dimensional marginally trapped surfaces, referred to as black hole and cosmological apparent horizons in a Hoava universe. Based on this method, we deal with the characteristics of the 2-dimensional space-like spheres of symmetry and the peculiarities of having trapping horizons. Moreover, we apply this method in standard expanding and contracting FLRW cosmological models of a Horava universe to investigate the conditions under which the extra parameters of the theory may lead to trapped/anti-trapped surfaces both in the future and in the past. We also include the cases of negative time, referred to as the finite past, and discuss the formation of anti-trapped surfaces inside the cosmological apparent horizons.

关键词： Horava universe standard cosmology null congruence expansion black hole horizons white holes