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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Geotechnical Geology
- نوع مقاله: Journal Article
- کلمات کلیدی: Upper Cretaceous,Coccolithophorids,Nannofossil,South east Isfahan
- چکیده:
- چکیده انگلیسی: This research studied the biostrigraphy of Upper Cretaceous deposits (Santonian - Masstrichtian) regarding to Coccolithophorids South east Isfahan, Central Iran. Nannofossils out of two sections from south and south-east Isfahan had good preservation and high variety. Lithostratigraphic unit have different thicknesses that, include marly limestone, shale, and limestone. Fine grained sediments, normally consisting of shale and marly limestone, have the best chance to contain nannofossils with respect to their content in calcareous nannofossils. The following genera and species were identified from deposits:
Arkhangelskiella cymbiformis, Biscutum magnum, Braarudospheara sp., Calculites obscurus, Ceratholitoides self-trailiae, Ceratolithoides aculeus, Ceratolithoides amplector, Ceratolithoides brevicornicalans, Ceratolithoides kamptneri, Ceratolithoides pricei, Ceratolithoides sp., Cyclagelosphaera margerelii, Lithraphidites carniolensis, Lithraphidites quadratus, Lucianorhabdus cayeuxii, Lucianorhabdus maleformis, Micula murus, Micula praemurus, Micula prinsii, Nannoconus dauvillieri, Quadrum gartneri, Quadrum trifidus, Thoracosphaera opercula, Watznaueria barnesae.
Most of them have good preservation and high variety. Totally 16 genera, 26 species related to the calcareous nannofossils have been identified.- انتشار مقاله: 01-07-1399
- نویسندگان: Fatemeh Hadavi,Khosro Khosrowtehrani,Ali Aghanabati,Mohammadreza Baniasadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Computational Methods for Differential Equations
- نوع مقاله: Journal Article
- کلمات کلیدی: Radial basis functions,Time-fractional convection-diffusion equation,Finite integration method,Product Simpson integration method
- چکیده:
- چکیده انگلیسی: In this paper, a modification of finite integration method (FIM) is combined with the radial basis function (RBF) method to solve a time-fractional convection-diffusion equation with variable coefficients. The FIM transforms partial differential equations into integral equations and this creates some constants of integration. Unlike the usual FIM, the proposed method computes constants of integration by using initial condi-tions. This leads to fewer computations rather than the standard FIM. Also, a product Simpson method is used to overcome the singularity included in the definition of fractional derivatives, and an integration matrix is obtained. Some numerical examples are provided to show the efficiency of the method. In addition, a comparison is made between the proposed method and the previous ones.
- انتشار مقاله: 03-08-1396
- نویسندگان: Jafar Biazar,Mohammad Ali Asadi
- مشاهده