نتایج جستجو برای: solid solid reaction
تعداد نتایج: 588225 فیلتر نتایج به سال:
در اینجا با اصلاحی که بر مدل multi solid phase انجام شده است ، و روش حل پیشنهادی یک برنامه کامپیوتری برای پیش بینی دمای پیدایش واکس و همچنین میزان واکس تشکیل شده، در نمونه های نفتی مختلف ، ارائه شده است . در این کار از مدل فاز جامد چندگانه (multi solid phase)، که روشی مبتنی بر تحقیقات و آزمایشات انجام شده در سالهای اخیر (1991-1997) می باشد، استفاده می شود. در این مدل گفته می شود که در ابتدا فاز...
امروزه در جوامع بشری خطوط لوله شریان های حیاتی اهمیت بسزایی دارند. این خطوط به دلیل گستردگی در بخش های مختلف جغرافیایی با وجود خاک هایی با خصوصیت های مختلف در معرض خطرات گوناگون لرزه ای قرار دارند. شناخت دقیق رفتار خطوط لوله مدفون شریان های حیاتی، از هر دسته که باشند، در برخورد با خطرات لرزه ای برای طراحی دقیق و بهینه حائز اهمیت است. چرا که ایجاد مشکل در خطوط انتقال گاز و نفت باعث توقف در سوخت ...
Recently, solid-phase synthesis has been recognized as an important methodology for combinatorial chemistry or automated synthesis directed at drug discovery. Various synthetic methodologies have been applied to solid-phase synthesis, although it appears that organometallic chemistry in this area is still being explored. In solution-phase chemistry, organometallic reagents have been utilized fo...
β-acetamido ketones were synthesized in excellent yields through one-pot condensation reaction of aldehydes, acetophenones, acetyl chloride, and acetonitrile in the presence of boric acid as a solid heterogeneous catalyst at room temperature. It is the first successful report of boric acid that has been used as solid acid catalyst for the preparation of β-acetamido ketones. The remarkable advan...
CdSe quantum dots with polymerisable ligands have been incorporated into polystyrene beads, via a suspension polymerisation reaction, as a first step towards the optical encoding of solid supports for application in solid phase organic chemistry.
چکیده ندارد.
Nanostructured Iron Oxide with different morphologies of rod-like and granular have been suc-cessfully prepared via a solid-state reaction in the presence of NaCl, NaBr, NaI and NaN3, respectively. The added salts not only prevent a drastic increase in the size of the products but also provide suitable conditions for the oriented growth of primary nanoparticles. The formation mechanisms of thes...
Based on the difference in the redox potentials between two metal species, the galvanic replacement reaction is known to create an irreversible process to generate hollow nanostructures in a wide range of shapes. In the context of galvanic replacement reaction, continuing etching leads to the general collapse of the hollow structures because of the excess amount of oxidizing agent. We demonstra...
in this work, so3h-functionalizedphthalimide (sfp) as a so3h-containing solid acid is prepared by the reaction of phthalimide with chlorosulfonic acid, and characterized by ft-ir, 1h and 13c nmr, mass, tg, dtg, xrd and sem. then, it is utilized as a highly efficient, heterogeneous and green catalyst for the one-pot multi-component condensation of dimedone with arylaldehydes, β-ketoesters and am...
The dimer method is a minimum mode following algorithm for finding saddle points on a potential energy surface of atomic systems. Here, the dimer method is extended to include the cell degrees of freedom for periodic solid-state systems. Using this method, reaction pathways of solid-solid phase transitions can be determined without having to specify the final state structure or reaction mechani...
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