scholarly journals PENGOLAHAN PLASTIK POLYSTYRENE DAN POLYPROPYLENE MENJADI LIQUID FUEL MENGGGUNAKAN KATALIS GAMMA ALUMINA (γ-Al2O3) DAN ZEOLIT TERAKTIVASI DALAM SINGLE STAGE SEPARATOR

2021 ◽  
Vol 4 (2) ◽  
pp. 65-73
Author(s):  
Arizal Aswan ◽  
Sutini Pujiastuti L ◽  
K.A Ridwan ◽  
Fatria Fatria ◽  
Bina Trijayanti ◽  
...  
Keyword(s):  
Liquid Fuel ◽  
Single Stage ◽  
Gamma Alumina

Proses pirolisis sampah plastik merupakan proses dekomposisi senyawa organik yang terdapat dalam plastik melalui proses pemanasan dengan sedikit atau tanpa melibatkan oksigen. Penelitian ini bertujuan untuk menentukan pengaruh jenis plastik yang digunakan, temperatur, dan jenis katalis terhadap produk hasil pirolisis. Pada penelitian ini jenis plastik yang digunakan berupa Polystyrene dan Polypropylene dengan variasi katalis Zeolit 20% serta Gamma Alumina 10%. Hasil analisa terbaik pada (% Yeild, densitas, viskositas, titik nyala, dan GC-MS) diperoleh pada penggunaan sampah plastik Polystyrene dengan katalis Gamma Alumina  sedangkan analisa nilai kalor dengan hasil terbaik diperoleh pada sampah plastik Polypropylene dengan katalis Gamma Alumina.

Site occupancy in gamma alumina

1996 ◽  
Vol 54 ◽  
pp. 654-655
Author(s):  
C. A. Bateman ◽  
A.Z. Ringwelski ◽  
R.W. Broach
Keyword(s):  
Spinel Structure ◽  
Site Occupancy ◽  
Unit Cell ◽  
Neutron Diffraction Data ◽  
Gamma Alumina ◽  
Tetrahedral Sites ◽  
Powder Neutron Diffraction ◽  
Cation Sites ◽  
Powder Neutron Diffraction Data ◽  
Insufficient Number

Gamma (γ) alumina is referred to as a defect spinel because it has a tetragonally distorted spinel structure (AB2O4) and an insufficient number of cations to fill all cation sites. In the spinel structure, the oxygen lattice is cubic close packed with A- and B-site cations in tetrahedral and octahedral coordination, respectively. The 2l⅓ Al atoms per unit cell of γ alumina can distribute themselves across 16 octahedral and 8 tetrahedral sites.The literature differs on where the 2⅔ cation vacancies per unit cell are located. Wilson and McConnell proposed that the vacancies in γ alumina, as first formed by calcining boehmite, are predominantly on the tetrahedral lattice but, with further heat treatment, move to occupy random positions on both octahedral and tetrahedral lattices. One study using NMR showed that the vacancies lay exclusively on the tetrahedral lattice, independent of the calcination temperature. A more-recent study using Rietveld refinement of powder neutron diffraction data suggested that both octahedral and tetrahedral lattices were partially occupied.

33: Synchronous Urethral Strictures: Prevalence and 10-Year Experience with Single Stage Reconstruction Via Systematic Retrograde Surgical Approach

2007 ◽  
Vol 177 (4S) ◽  
pp. 12-12
Author(s):  
L. Andrew Evans ◽  
Benjamin Moses ◽  
Kevin Rice ◽  
Craig Robson ◽  
Allen F. Morey
Keyword(s):  
Surgical Approach ◽  
Single Stage ◽  
Urethral Strictures

Liquid Fuel at Sea

1894 ◽  
Vol 37 (959supp) ◽  
pp. 15321-15322
Keyword(s):  
Liquid Fuel

A SINGLE STAGE ECR SOURCE FOR THE RADIOACTIVE ION BEAM PROJECT IN LOUVAIN-LA-NEUVE

1989 ◽  
Vol 50 (C1) ◽  
pp. C1-813-C1-817
Author(s):  
M. ARNOULD ◽  
F. BAETEN ◽  
D. DARQUENNES ◽  
Th. DELBAR ◽  
C. DOM ◽  
...  
Keyword(s):  
Ion Beam ◽  
Single Stage ◽  
Radioactive Ion Beam ◽  
Ecr Source

Immediate Single-Stage Reconstruction of Complex Frontofaciobasal Injuries: Part II

2014 ◽  
Vol 75 (S 01) ◽  
Author(s):  
Sherif Emara ◽  
Hassan Nablsi ◽  
Tarek ELKammash ◽  
Mohamed Sief ◽  
Khaled Attia ◽  
...  
Keyword(s):  
Single Stage

Early Outcomes with the Single-Stage Combined Surgical and Endovascular Treatment of Complex Aortic Pathologies: The Arch Light Technique

2016 ◽  
Vol 64 (S 01) ◽  
Author(s):  
P. Risteski ◽  
A. El-Sayed ◽  
M. Ay ◽  
N. Monsefi ◽  
N. Papadopoulos ◽  
...  
Keyword(s):  
Endovascular Treatment ◽  
Single Stage ◽  
Aortic Pathologies

Effects of stator splitter blades on aerodynamic performance of a single-stage transonic axial compressor

2020 ◽  
Vol 14 (4) ◽  
pp. 7369-7378
Author(s):  
Ky-Quang Pham ◽  
Xuan-Truong Le ◽  
Cong-Truong Dinh
Keyword(s):  
Stokes Equations ◽  
Three Dimensional ◽  
Axial Compressor ◽  
Aerodynamic Performance ◽  
Numerical Results ◽  
Single Stage ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Operating Stability ◽  
Length Coverage

Splitter blades located between stator blades in a single-stage axial compressor were proposed and investigated in this work to find their effects on aerodynamic performance and operating stability. Aerodynamic performance of the compressor was evaluated using three-dimensional Reynolds-averaged Navier-Stokes equations using the k-e turbulence model with a scalable wall function. The numerical results for the typical performance parameters without stator splitter blades were validated in comparison with experimental data. The numerical results of a parametric study using four geometric parameters (chord length, coverage angle, height and position) of the stator splitter blades showed that the operational stability of the single-stage axial compressor enhances remarkably using the stator splitter blades. The splitters were effective in suppressing flow separation in the stator domain of the compressor at near-stall condition which affects considerably the aerodynamic performance of the compressor.

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