Mixtures of carbon dioxide and secondary butyl alcohol at high pressures are interesting for a range of industrial applications. Therefore, it is important to have trustworthy experimental data on the high-pressure phase behavior of this mixture over a wide range of temperatures. In addition, an accurate thermodynamic model is necessary for the optimal design and operation of processes. In this...

An extensive comparison of SRK, CPA, and PC-SAFT for the speed of sound in normal alkanes has been performed. The results reveal that PC-SAFT captures the curvature of the speed of sound better than cubic EoS, but the accuracy is not satisfactory. Two approaches have been proposed to improve PC-SAFT’s accuracy for speed of sound: (i) putting speed of sound data into parameter estimation; (ii) p...

Mục tiêu: Đánh giá hiệu quả của công thức SRK/T trong dự tính suất thể thủy tinh (TTT) nhân tạo. Đối tượng và phương pháp nghiên cứu: Nghiên cứu mô tả tiến thực hiện từ tháng 11/2022 - 3/2023 trên 162 mắt bệnh phẫu thuật Phaco đặt TTT tạo, tạo được bằng thứ SRK/T; tại Bệnh viện Mắt Nghệ An. đánh kết khúc xạ tồn dư thị lực các thời điểm sau mổ 1 tuần, 3 tháng. Kết quả: Khúc cầu tương đương trung...

AIM To determine the long term visual and refractive results, and stability and complications of primary polypseudophakia using poly(methylmethacrylate) (PMMA) intraocular lenses (IOLs) for cataract surgery in hypermetropic eyes. METHODS Prospective study of 15 short or hypermetropic eyes undergoing phacoemulsification with primary polypseudophakia with two PMMA IOLs implanted within the caps...

Biomass fast pyrolysis process is a technology that converts renewable solids into dense liquid. This study aims to apprehend the thermodynamic behaviour of Intermediate Liquid Compounds (ILCs) observed during biomass pyrolysis. The system studied was closed (20 mL) with air and mixture solution five components (Acetic acid (AA), hydroxyacetone (HX), phenol; furfural (FF) methanol) at 90°C unde...

Based on reasonable testing model problems, we study the preservation by symplectic Runge-Kutta method (SRK) and symplectic partitioned Runge-Kutta method (SPRK) of structures for fixed points of linear Hamiltonian systems. The structure-preservation region provides a practical criterion for choosing step-size in symplectic computation. Examples are given to justify the investigation.

استخراج فوق بحرانی یکی از جدیدترین روش­های خالص­سازی مواد اولیه و محصولات که امروزه مورد استقبال قرار گرفته است. در این مطالعه از معادلات حالت prsv و srk برای تخمین حلالیت 10 ماده جامد رایج در دی­اکسیدکربن فوق بحرانی استفاده شده است. نتایج شبیه­سازی نشان داد معادله prsv تطابق بهتری با داده­های تجربی دارد. هر دو معادله برای پیش­بینی حلالیت جامدات نیاز به پارامتر برهم­کنش دوتایی داشتند. همچنین پا...