scholarly journals The Methanol Adsorption in Microporous Alumina Agglomerates

2019 ◽  
Vol 3 (1) ◽  
pp. 22
Author(s):  
Grygorii Dragan ◽  
Volodymyr Kutarov ◽  
Mykola Poletaiev ◽  
Kyrylo Kolesnykov ◽  
Mariya Khlebnikova
Keyword(s):  
Aluminum Oxide ◽  
Adsorption Equilibrium ◽  
Capillary Condensation ◽  
Quantitative Description ◽  
Gas Dispersion ◽  
Volume Filling ◽  
Qualitative And Quantitative ◽  
Methanol Adsorption ◽  
Adsorption Desorption ◽  
Open Slit

We have studied theoretical and experimental methods of methanol adsorption in micropores of aluminum oxide agglomerates obtained by gas-dispersion synthesis. It is shown that the necessity to use strict equations based on the theory of volume filling of micropores, which implies a physical and formal analogy between the volume filling of micropores and capillary condensation, for qualitative and quantitative description of adsorption equilibrium in open slit-like micropores. The applicability of the proposed equations for the description of adsorption equilibrium in such systems is demonstrated on the example of experimental methanol adsorption/desorption isotherm on the aluminum oxide, which possesses a microporous structure.

scholarly journals Extraction and Mass Spectrometric Characterization of Terpenes Recovered from Olive Leaves Using a New Adsorbent-Assisted Supercritical CO2 Process

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1301
Author(s):  
Zully J. Suárez Montenegro ◽  
Gerardo Álvarez-Rivera ◽  
Jose A. Mendiola ◽  
Elena Ibáñez ◽  
Alejandro Cifuentes
Keyword(s):  
Aluminum Oxide ◽  
Silica Gel ◽  
Supercritical Co2 ◽  
Olive Leaves ◽  
Fractionation Process ◽  
Selective Enrichment ◽  
Adsorption Desorption ◽  
First Time ◽  
By Products

This work reports the use of GC-QTOF-MS to obtain a deep characterization of terpenoid compounds recovered from olive leaves, which is one of the largest by-products generated by the olive oil industry. This work includes an innovative supercritical CO2 fractionation process based on the online coupling of supercritical fluid extraction (SFE) and dynamic adsorption/desorption for the selective enrichment of terpenoids in the different olive leaves extracts. The selectivity of different commercial adsorbents such as silica gel, zeolite, and aluminum oxide was evaluated toward the different terpene families present in olive leaves. Operating at 30 MPa and 60 °C, an adsorbent-assisted fractionation was carried out every 20 min for a total time of 120 min. For the first time, GC-QTOF-MS allowed the identification of 40 terpenoids in olive leaves. The GC-QTOF-MS results indicate that silica gel is a suitable adsorbent to partially retain polyunsaturated C10 and C15 terpenes. In addition, aluminum oxide increases C20 recoveries, whereas crystalline zeolites favor C30 terpenes recoveries. The different healthy properties that have been described for terpenoids makes the current SFE-GC-QTOF-MS process especially interesting and suitable for their revalorization.

Kinetics of inactivation of staphylolytic enzymes: Qualitative and quantitative description

Biochimie ◽  
2019 ◽  
Vol 162 ◽  
pp. 77-87
Author(s):  
Lyubov Filatova ◽  
David Donovan ◽  
Steven Swift ◽  
Vladimir Pugachev ◽  
Georgy Emelianov ◽  
...  
Keyword(s):  
Quantitative Description ◽  
Qualitative And Quantitative ◽  
Kinetics Of

scholarly journals Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 326 ◽  
Author(s):  
Peng Sun ◽  
Jun Zhang ◽  
Wenxiu Liu ◽  
Qi Wang ◽  
Wenbin Cao
Keyword(s):  
Adsorption Equilibrium ◽  
Illumination Intensity ◽  
Desorption Process ◽  
Doped Tio2 ◽  
Coverage Ratio ◽  
Nitrogen Doped ◽  
Desorption Equilibrium ◽  
Adsorption Desorption ◽  
Kinetics Of ◽  
Gaseous Benzene

In this paper, the Langmuir-Hinshelwood (L-H) model has been used to investigate the kinetics of photodegradation of gaseous benzene by nitrogen-doped TiO2 (N-TiO2) at 25 °C under visible light irradiation. Experimental results show that the photoreaction coefficient kpm increased from 3.992 × 10−6 mol·kg−1·s−1 to 11.55 × 10−6 mol·kg−1·s−1 along with increasing illumination intensity. However, the adsorption equilibrium constant KL decreased from 1139 to 597 m3·mol−1 when the illumination intensity increased from 36.7 × 104 lx to 75.1 × 104 lx, whereas it was 2761 m3·mol−1 in the absence of light. This is contrary to the fact that KL should be a constant if the temperature was fixed. This phenomenon can be attributed to the breaking of the adsorption-desorption equilibrium by photocatalytically decomposition. To compensate for the disequilibrium of the adsorption-desorption process, photoreaction coefficient kpm was introduced to the expression of KL and the compensation form was denoted as Km. KL is an indicator of the adsorption capacity of TiO2 while Km is only an indicator of the coverage ratio of TiO2 surface. The modified L-H model has been experimentally verified so it is expected to be used to predict the kinetics of the photocatalytic degradation of gaseous benzene.

A review of the ecology of the deep-water pelagic fauna of the Rockall Trough

1986 ◽  
Vol 88 ◽  
pp. 145-157
Author(s):  
J. Mauchline
Keyword(s):  
Deep Water ◽  
Quantitative Description ◽  
Demersal Fish ◽  
Historical Account ◽  
Production Rates ◽  
Qualitative And Quantitative ◽  
The North ◽  
Rockall Trough

SynopsisA brief historical account of the early faunal investigations is given. Modern studies concentrate on qualitative and quantitative description and interpretation of the processes taking place within the Rockall Trough. Demographic analyses are feasible on a variety of species allowing estimation of growth and production rates. The pelagic fauna impinges on the benthopelagic environments of the slope regions of the Trough. There it is predated by populations of demersal fish. Advection of fauna takes place to the north and northeast, probably primarily in the slope current.

Aerial pursuit flights in the shoveler

1974 ◽  
Vol 52 (12) ◽  
pp. 1473-1480 ◽  
Author(s):  
Norman R. Seymour
Keyword(s):  
Breeding Season ◽  
Quantitative Description ◽  
Wild Birds ◽  
Flight Behavior ◽  
Territorial Defense ◽  
Qualitative And Quantitative ◽  
Active Mechanism ◽  
Seasonal Basis ◽  
Males And Females

Analysis of 266 pursuit flights of wild birds provided a qualitative and quantitative description of aspects of this phenomenon. Flight behavior and frequency were analyzed for the general prelaying, laying, incubation, and renesting periods.Flight behavior of pursued males and females and that of the pursuing male varied little throughout the breeding season. No difference was detected on a daily basis.Flight frequency was greatest during the morning (0500 to 1000 h) period throughout the season. On a seasonal basis, frequency was greatest during territory establishment and declined after general incubation began. Another peak of activity occurred during the renesting period. Frequency during all periods reflected the number of non-territorial pairs interacting with territorial pairs.Attempted rape and associated flight was rare, with most flights apparently resulting from hostility associated with territorial defense. The pursuer was invariably a territorial male.The pursuit flight functioned in the establishment and maintenance of territories and was the major active mechanism in the spacing of breeding pairs.

scholarly journals Adsorption Equilibrium and Hysteresis in Open Slit-Like Micropores

2015 ◽  
Vol 4 (4) ◽  
pp. 351-357
Author(s):  
V.V. Kutarov ◽  
◽  
Yu.I. Tarasevich ◽  
E.V. Aksenenko ◽  
R.M. Dlubovskiy ◽  
...  
Keyword(s):  
Adsorption Equilibrium ◽  
Open Slit

scholarly journals PENERAPAN MODEL PEMBELAJARAN LRD (LISTEN, READ AND DISCUSS) UNTUK MENINGKATKAN KETERAMPILAN MEMBACA SISWA KELAS X IPA 2 SMAN 1 PRINGGARATA

2021 ◽  
Vol 1 (2) ◽  
pp. 149-158
Author(s):  
JUPRI JUPRI
Keyword(s):  
High School ◽  
Action Research ◽  
Learning Process ◽  
Teaching And Learning ◽  
Quantitative Description ◽  
Reading Skill ◽  
Qualitative Description ◽  
Qualitative And Quantitative ◽  
Tenth Grade ◽  
Written Test

This study concerns with Listen Read Discuss (LRD) to promote students’ reading skill. The aim of this study was to promote students’ reading skill through (LRD) technique . In this study, the researcher used classroom action research in which the datas were described in qualitative and quantitative description using the instruments of observation checklist, test and documentation. Observation was conducted to know the implementation of (LRD) technique during teaching and learning process and its datas were decribed in qualitative description, while test used to measure the students’ achievement in reading skill in form of a written test and described in quatitative description. Subject of this study was tenth- grade of SMAN 1 Pringgarata which consists of 30 students.This study was conducted in two cycles, each cycle consisted of 4 steps such as: planning, acting, observing and reflecting. The result of this research showed that (LRD) technique could promote students’ reading skill. It could be seen from the significant improvement of result in each cycle. The average of students’ score before implementing the strategy was 47, and increased into 61 in the first cycle . After doing treatment and it increased into 81 in second cycle. It means, students’ reading skill was improved and successful by applying (LRD) technique at the tenth-grade of senior high school, SMAN 1 Pringgarata. ABSTRAKPenelitian ini fokus untuk mengkaji penerapan model pembelajaran LRD (Learn Read Discuss) untuk meningkat keterampilan membaca siswa. Tujuan dari penelitian ini adalah untuk memaparkan perencanaan, pelaksanaan dan evaluasi peningkatan keterampilan membaca pada siswa kelas X IPA 2 SMA Negeri 1 Pringgarata dengan menggunakan model pembelajaran LRD (Listen Read Discuss). Penelitian ini merupakan penelitian tindakan kelas (PTK) yang datanya dipaparkan melalui data deskripsi kualitatif dan kuantitatif. Penelitian ini dilaksanakan dalam dua siklus. Setiap siklus terdiri dari atas 4 tahap yaitu: tahap perencanaan, pelakasanaan (tindakan), observasi dan refleksi. Data proses pembelajaran setiap siklus dianalisis secara deskriptif kualitatif sedangkan data hasil pembelajaran dianalisis secara deskriptif kuantitatif. Subjek penelitian ini adalah siswa kelas X IPA 2 yang berjumlah 30 orang. Hasil penelitian sebelum diterapkan LRD adalah 47,00 setelah dilakukan tindakan menunjukkan bahwa nilai yang diperoleh siswa pada siklus I meningkat menjadi 61,00 dan pada siklus II mencapai 81,00. Nilai prolehan ini sudah melampaui angka KKM yang diisyaratkan pada mata pelajaran bahasa Inggris di kelas X SMAN 1 Pringgarata Tahun Pelajarn 2021/2022 yaitu 75. Hasil penelitian menunjukkan bahwa pembelajaran dengan model LRD dapat meningkatkan keterampilan membaca, khusunya keterampilan membaca jenis teks rcount, siswa kelas X IPA2 SMA Negeri 1 Pringgarata.

Characteristics of Phosphate Ion Adsorption-Desorption onto Aluminum Oxide Hydroxide for Preventing Eutrophication

2003 ◽  
Vol 36 (4) ◽  
pp. 499-505 ◽  
Author(s):  
Mineaki Kabayama ◽  
Tohru Sakiyama ◽  
Naohito Kawasaki ◽  
Takeo Nakamura ◽  
Mamiko Araki ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Ion Adsorption ◽  
Phosphate Ion ◽  
Oxide Hydroxide ◽  
Adsorption Desorption
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