نتایج جستجو برای: first order and shell progressive particle diffusion equations adequately described fe release

تعداد نتایج: 17161785  

Journal: :international journal of advanced design and manufacturing technology 0
foozieh morovat phd student from k.n.toosi university of technology

abstract: the present study deals with the buckling analysis of the laminated composite truncated conical sandwich shells with flexible core subjected to combined axial compressive load and external pressure. higher order governing equations of the motion are presented for conical composite sandwich shells, where they are derived from the hamilton principle. then, by the use of improved higher-...

Ghasemi , B. , Jafari , A.A.,

 The aim of this article is the survey of the effect of several parameters of stiffeners on the buckling load of the composite cylindrical shell. The used composite material is laminate and shell equations are derived using energy approach and the principle of minimum potential energy. Also shell equations are based on the first-order shear deformation theory of shells and boundary conditions a...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده زبانهای خارجی 1390

the purpose of the present study was to see which one of the two instruction-processing instruction (pi) and meaningful output based instruction (mobi) accompanied with prompt and recast- is more effective on efl learners’ writing accuracy. in order to homogenize the participants in term of language proficiency a preliminary english test (pet) was administrated between 74 intermediate students ...

Journal: :international journal of advanced design and manufacturing technology 0
morteza raminnia corresponding author

in this study, thermo-mechanical nonlinear vibration of a polyethylene (pe) cylindrical shell embedded in an elastic foundation was investigated. the shell is reinforced by armchair carbon nanotubes (cnts) where characteristics of the equivalent composite being determined using mori-tanaka model. the elastic medium is simulated using the spring constant of the winkler-type,  . employing nonline...

Journal: :Materials science & engineering. C, Materials for biological applications 2014
Amalia Hadjitheodorou George Kalosakas

We investigate, both analytically and numerically, diffusion-controlled drug release from composite spherical formulations consisting of an inner core and an outer shell of different drug diffusion coefficients. Theoretically derived analytical results are based on the exact solution of Fick's second law of diffusion for a composite sphere, while numerical data are obtained using Monte Carlo si...

Journal: :iranian journal of pharmaceutical sciences 0
gunda raghavendra kumar assistant.professor, department of pharmaceutics, narasaraopeta institute of pharmaceutical sciences, yellamanda(po), narasaraopet, guntur (dt), andhrapradesh j.n. suresh kumar professor & principal, narasaraopeta institute of pharmaceutical sciences, narasaraopet, guntur(d.t), a.p. india-522601. v. satyanarayana assistant professor, department of pharmacy practice, narasaraopeta institute of pharmaceutical sciences, narasaraopet, guntur(d.t), a.p. india-522601. g. swarupa rani assistant professor, department of pharmacology, narasaraopeta institute of pharmaceutical sciences, narasaraopet, guntur(d.t), a.p. india-522601. b. satya prasad assistant professor, department of pharmaceutical analysis, narasaraopeta institute of pharmaceutical sciences, narasaraopet, guntur(d.t), a.p. india-522601.

the main objective of present research work is to formulate the clopidogrel fast dissolving tablets. clopidogrel, an antiplatelet drug, belongs to bcs class-ii and used to control heart attack, hypertension by inhibiting platelet activation and aggregation .the fast dissolving tablets of clopidogrel were prepared employing different concentrations of crospovidone and croscarmellose sodium in di...

2014
Rehana Saeed Zain Ul Abdeen

Isotherms for the adsorption of KCl in PVOH-borate hydrogel was studied at 303 K by determining the amount of potassium and chloride ions adsorbed in PVOH-borate hydrogel using ion exchange chromatography and potentiometric titrations respectively. Experimental data was tested for Frendulich’s, Langmuir’s, Temkin’s and Dubinin–Radushkevich isotherms equations. The adsorption data follows isothe...

Kamla Pathak, Sonam Singh,

The aim of the present work was to assess the feasibility of Acconon MC8-2 EP/NF as a bioadhesive material for developing controlled release gastroretentive microsponges of loratadine. Modified emulsion-solvent diffusion method was employed for the preparation of microsponges (F1-F9) based on  32 factorial design. The amount of ethyl cellulose (EC) and polyvinyl alcohol (PVA) were selected...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده مهندسی برق و کامپیوتر 1391

power transformers are important equipments in power systems. thus there is a large number of researches devoted of power transformers. however, there is still a demand for future investigations, especially in the field of diagnosis of transformer failures. in order to fulfill the demand, the first part reports a study case in which four main types of failures on the active part are investigate...

2003
Florence E Eichie Roland S Okor

Purpose: Drug microparticles may be microencapsulated with water-insoluble polymers to obtain controlled release, which may be further determined by the particle distribution. The purpose of this study was to determine the drug release parameters needed for the theoretical prediction of the release profiles of single aspirin crystals and their microcapsules. Method: Four single crystals of aspi...

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