检索结果-南通市图书馆

Experimental investigation of process parameters during graphitization of catalytic coke

在线全文

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2019年第4期6卷 611-620页

作者： Kobra Pourabdollah Masoud Samadian Zakaria Seyed Mohammad mir Najafizadeh fatemeh Motaghedi Chemistry and Chemical Engineering Research Center of Iran TehranIran Department of Research and Technology Tehran Province Gas CompanyTehranIran

The aim of this project is studying the effect of thermal operation parameters on the graphitization of self-diffused ethane-based catalytic *** novelty of this study refers to self-diffused metals that had given unique properties to the catalytic coke and had improved the graphitization degree at low *** main feature of this research is presenting a remarkable energy saving approach that uses low-cost installations for production of graphitized *** experiments were performed in two steps including preparation of self-diffused ethane-based catalytic coke and then low-temperature graphitization of coke samples below 1500 ℃.Characteristic tests were performed by determination of electrical resistivity and XRD pattern of graphitized samples including graphitization degree,aromaticity,coke rank,number of carbon rings,graphene thickness and *** results revealed that the blanket atmosphere,final temperature and exposure time had the greatest impact on the aforementioned criteria,while the role of thermal ramp and sulfur content of catalytic coke was *** electrical resistivity tests on the graphitized sample showed how the electrical resistivity of graphitized samples is a function of graphitization degree.

关键词： Graphite Catalytic coke Self-diffusion Desulfurization

On the structural and optical properties investigation of annealed Zn nanorods in the oxygen flux

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第11期30卷 580-589页

作者： fatemeh Abdi Department of Engineering Sciences Faculty of Advanced TechnologiesUniversity of Mohaghegh ArdabiliNaminIran

Zn nano rods were produced on glass substrates using oblique angle deposition method at different deposition *** oxidation,the samples were placed in a furnace under oxygen *** and FESEM images were used to morphology analysis of the *** results showed that with increasing the angle of deposition,the grain size decreases and the porosity of the structures *** pattern and XPS depth profile analysis were used to crystallography and oxide thickness investigations,*** XRD results confirmed oxide phase formation,and the XPS results analyzed the oxide layer *** result showed that as the deposition angle of the nanorods increases,the thickness of the oxide layer *** reason for the increase in the thickness of the oxide layer with increasing deposition angle was investigated and attributed to the increase in the porosity of the thin *** optical spectra of the structures for p polarized light at 10incident light angle were obtained using single beam spectrophotometer in the 300 nm to 1000 nm *** results showed that the formed structures although annealed in oxygen flux,tend to behave like *** calculate the optical constant of the structures,the reverse homogenization theory was used and the void fraction and complex refractive index of the structures were ***,by calculating permittivity and optical conductivity of the structures,their changes with the deposition angle were investigated.

关键词： nano rod optical spectra refractive index reverses homogenization

High-order phase-field model with the local and second-order max-entropy approximants

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2019年第2期13卷 406-416页

作者： fatemeh AmirI Department of Mechanical Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran School of Mathematics Institute for Research in Fundamental Sciences (1PM)Tehran 19395-5746Iran

We approximate the fracture surface energy functional based on phase-field method with smooth local maximum entropy (LME) and second-order maximum entropy (SME) approximants. The higher-order continuity of the meshfree methods such as LME and SME approximants allows to directly solve the fourth-order phase-field equations without splitting the fourth?ordcr differential equation into two second-order differential equations. We will first show that the crack surface functional can be captured more accurately in the fourth-order model with smooth approximants such as LME, SME and B-spline. Furthermore, smaller length scale parameter is needed for the fourth-order model to approximate the energy functional. We also study SME approximants and drive the formulations. The proposed meshfree fourth-order phase-field formulation show more stable results tor SME compared to LME meshfree methods.

关键词： second-order maximum entropy local maximum entropy second-and fourth-order phase-field models B-spline

The BV Formalization of Chern-Simons Theory on Deformed Superspace

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2012年第11期58卷 704-710页

作者： mir Faizal Mathematical Institute University of OxfordOxford OX1 3LBEngland

In this paper we will study non-abelian Chern-Simons theory on a deformed superspace. We will deform the superspace in such a way that it includes the noncommutativity between bosonic and fermionic coordinates. We will first analyse the BRST and the anti-BRST symmetries of the Chern-Simons theory on this deformed superspace. Then we will analyse the extended BRST and the extended anti-BRST symmetries of this theory in the Batalin-Vilkovisky (BV) formalism. Finally, we will express these extended BRST and extended anti-BRST symmetries in extended superspace formalism by introducing new Grassmann coordinates.

关键词： noncommutative superspace Batalin-Vilkovisky formalism

Vault RNAs(vtRNAs):Rediscovered non-coding RNAs with diverse physiological and pathological activities

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Genes & Diseases 2024年第2期11卷 772-787页

作者： Mahsa Aghajani mir Deputy of Research and Technology Health Research InstituteBabol University of Medical SciencesBabol 47176-4774Iran

The physicochemical characteristics of RNA admit non-coding RNAs to perform a different range of biological acts through various mechanisms and are involved in regulating a diversity of fundamental ***,some reports of pathological conditions have proved abnormal expression of many non-coding RNAs guides the *** RNAs are a class of non-coding RNAs containing stem regions or loops with well-conserved sequence patterns that play a fundamental role in the function of vault particles through RNA-ligand,RNA–RNA,or RNA-protein *** together,vault RNAs have been proposed to be involved in a variety of functions such as cell proliferation,nucleocytoplasmic transport,intracellular detoxification processes,multidrug resistance,apoptosis,and autophagy,and serve as microRNA precursors and signaling *** decades of investigations devoted,the biological function of the vault particle or the vault RNAs is not yet completely *** this review,the current scientific assertions of the vital vault RNAs functions were discussed.

关键词： ncRNA Vault complex Vault RNA vtRNA viral infection tumorigenesis

Fabrication of Modified Fibrous Filters by Electrospinning and Investigating Their Application as Improved Face Masks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第11期42卷 1738-1748,I0010页

作者： Mehdi Mahmoudian fatemeh Zanbili Nanotechnology Research Group Faculty of ScienceUrmia UniversityUrmia57159-404931Iran Department of Nanochemistry Nanotechnology Research CenterUrmia UniversityUrmia57159-404931Iran

Owing to the significant increase in air pollutants and the spread of infectious diseases,it seems that the use of face masks will become an essential item in human ***,there is a need to conduct more research to develop novel types of respirators utilizing upto-date science such as *** this study,we fabricated a nanocomposite fibrous filter containing modified graphene oxide(GO)and zinc oxide(ZnO)*** layer was used as an active filter for absorbing and removing air pollutants,such as suspended submicron particles(below 2.5 microns)and CO_(2),NO_(2),and SO_(2)*** synthesized nanostructures and fibrous filters were characterized by different analysis(FTIR,XRD,TGA,and FESEM),and the performance of the filters was surveyed by tests such as pressure drop,CO_(2),NO_(2),SO_(2)gas rejection,and particulate *** results showed that the stabilization of the modified GO and ZnO nanostructures on the fibrous filter improved the effectiveness of this filter as a mask for removing toxic particles and gases,and the filter containing nanoparticles had the best performance.

关键词： Air pollutants Face masks Nanocomposite fibrous filter Electrospinning

Investigation into mechanisms and kinetics of asphaltene aggregation in toluene/n-hexane mixtures

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2020年第2期17卷 457-466页

作者： Bahram Soltani Soulgani fatemeh Reisi fatemeh Norouzi Department of Petroleum Engineering Petroleum University of TechnologyAhwazKhouzestanIran

Determining the rate of asphaltene particle growth is one of the main problems in modeling of asphaltene precipitation and *** this paper,the kinetics of asphaltene aggregation under different precipitant concentrations have been *** image processing method was performed on the digital photographs that were taken by a microscope as a function of time to determine the asphaltene aggregation growth *** results of image processing by MATLAB software revealed that the growth of asphaltene aggregates is strongly a function of *** regions could be recognized during asphaltene particle growth including reaction-and diffusion-limited aggregation followed by reaching the maximum asphaltene aggregate size and start of asphaltene settling and the final *** has been carried out to predict the growth of asphaltene particle size based on the fractal *** equations have been developed for kinetics of asphaltene aggregation for reaction-limited aggregation and diffusion-limited *** maximum size of asphaltene aggregates and settling time were modeled by using force balance,acting on asphaltene *** of modeling show a good agreement between laboratory measurements and model calculations.

关键词： Asphaltene precipitation Kinetic modeling Diffusion-limited aggregation(DLA) Image processing Asphaltene aggregation

Exhaustive Classification of the Invariant Solutions for a Specific Nonlinear Model Describing Near Planar and Marginally Long-Wave Unstable Interfaces for Phase Transition

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2018年第5期69卷 477-505页

作者： fatemeh Ahangari Department of Mathematics Faculty of Mathematical SciencesAlzahra University

Problems of thermodynamic phase transition originate inherently in solidification, combustion and various other significant fields. If the transition region among two locally stable phases is adequately narrow, the dynamics can be modeled by an interface motion. This paper is devoted to exhaustive analysis of the invariant solutions for a modified Kuramoto-Sivashinsky equation in two spatial and one temporal dimensions is presented. This nonlinear partial differential equation asymptotically characterizes near planar interfaces, which are marginally long-wave unstable. For this purpose, by applying the classical symmetry method for this model the classical symmetry operators are ***, the structure of the Lie algebra of symmetries is discussed and the optimal system of subalgebras, which yields the preliminary classification of group invariant solutions is constructed. Mainly, the Lie invariants corresponding to the infinitesimal symmetry generators as well as associated similarity reduced equations are also pointed out. Furthermore,the nonclassical symmetries of this nonlinear PDE are also comprehensively investigated.

关键词： phase transition modified Kuramoto-Sivashinsky ((2D) MKS) equation symmetries optimal system invariant solutions

M-Theory in the Gaugeon Formalism

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2012年第4期57卷 637-640页

作者： mir Faizal Department of Mathematics Durham UniversityDurhamDH1 3LEUnited Kingdom

In this paper we will analyse the Aharony-Bergman-Jafferis-Maldacena(ABJM) theory in N = 1 superspace *** then study the quantum gauge transformations for this ABJM theory in gaugeon *** will also analyse the extended BRST symmetry for this ABJM theory in gaugeon formalism and show that these BRST transformations for this theory are nilpotent and this in turn leads to the unitary evolution of the S-matrix.

关键词： ABJM gaugeon BRST N = 1 superspace