Development of a Hybrid First Principles-ANN Model for the Steam Hydrator in a Calcium Looping Process

2020 ◽  
Vol 13 ◽  
Author(s):  
Shreyasi Dutta ◽  
Shrinkhla Shrinkla ◽  
Mohamed Khalil Kallangodan ◽  
Anand VP Gurumoorthy
Keyword(s):  
Carbon Dioxide ◽  
Hybrid Model ◽  
Performance Prediction ◽  
First Principles ◽  
Individual Performance ◽  
Reversible Reaction ◽  
Ann Model ◽  
Cycle Number ◽  
Calcium Looping ◽  
The Individual

Abstract: One of the promising technologies for isolating carbon dioxide from a mixture of industrial flue gases is the calcium looping process. This process involves a reversible reaction between sorbent Calcium Oxide and Carbon Dioxide. Because sorbent loses its activity after multiple cycles, hydration step was proposed, which is another reversible reaction where deactivated sorbent is treated with steam to form Ca(OH)2, which undergoes the backward reaction to give back the regenerated sorbent. Blamey et al. (2016) developed a shrinking core model based on which, studies were carried out on a small experimental reactor. This paper aims at developing a hybrid model by combining [1] first principles model and an ANN model for improved prediction of the conversion in hydration of calcium looping process and to scale it up for optimal operations. The hybrid model is tested for various combinations of training variables and data sets with respect to temperature and cycle number and it is found that the hybrid model indeed gives better results. The performance prediction of Hybrid modelling is compared to the individual performance prediction of the ANN model and First principles approach

Pengaruh Kesesuaian Tugas-Teknologi, Kepercayaan dan Efektivitas Sistem Informasi Akuntansi Terhadap Kinerja Individu pada Pasar Swalayan di Kota Tangerang

2013 ◽  
Vol 5 (2) ◽  
pp. 62-80
Author(s):  
Agnes Ashianti ◽  
Albertus Fani
Keyword(s):  
Information Systems ◽  
Accounting Information ◽  
Individual Performance ◽  
Primary Data ◽  
Accounting Information System ◽  
Accounting Information Systems ◽  
Study Test ◽  
Task Technology Fit ◽  
The Individual ◽  
Systems Effectiveness

The objective of this research is to examine the effect of task-technology fit, trust of accounting information systems, and effectiveness of accounting information systems on the individual performance at a supermarket in Tangerang city.  The samples in this study were employees of a supermarket in Tangerang city who used accounting information system in doing its job. The data used in this study is primary data through questionnaires. In data analysis techniques, this study test the reliability of the formula coefficient of Cronbach 's Alpha, validity test by means of correlation using the r counted and r table, test for normality using Kolmogorov-Smirnov test, the classical assumption, hypothesis testing multiple linear regression, t test, and F test. The results showed that the task-technology fit and trust of accounting information systems each have a significant effect on the individual performance, while the effectiveness of accounting information systems does not significantly influence the individual performance. Task-technology fit, trust of accounting information systems, and the effectiveness of accounting information systems have simultaneous significant effect on the individual performance. Keyword: Task-Technology Fit, Trust of Accounting Information Systems, Effectiveness of Accounting Information Systems, Individual Performance..

scholarly journals Low ventilatory responsiveness to transient hypoxia or breath-holding predicts fast marathon performance in healthy middle-aged and older men

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bartłomiej Paleczny ◽  
Rafał Seredyński ◽  
Małgorzata Wyciszkiewicz ◽  
Adrianna Nowicka-Czudak ◽  
Wojciech Łopusiewicz ◽  
...  
Keyword(s):  
Plasma Renin ◽  
Older Men ◽  
Individual Performance ◽  
Breath Holding ◽  
Vasomotor Tone ◽  
Younger Men ◽  
The Individual ◽  
Peripheral Chemoreflex ◽  
Sympathetic Vasomotor Tone ◽  
Marathon Performance

AbstractThe aim of this study was to test the utility of haemodynamic and autonomic variables (e.g. peripheral chemoreflex sensitivity [PCheS], blood pressure variability [BPV]) for the prediction of individual performance (marathon time and VO2max) in older men. The post-competition vasodilation and sympathetic vasomotor tone predict the marathon performance in younger men, but their prognostic relevance in older men remains unknown. The peripheral chemoreflex restrains exercise-induced vasodilation via sympathetically-mediated mechanism, what makes it a plausible candidate for the individual performance marker. 23 men aged ≥ 50 year competing in the Wroclaw Marathon underwent an evaluation of: resting haemodynamic parameters, PCheS with two methods: transient hypoxia and breath-holding test (BHT), cardiac barosensitivity, heart rate variability (HRV) and BPV, plasma renin and aldosterone, VO2max in a cardiopulmonary exercise test (CPET). All tests were conducted twice: before and after the race, except for transient hypoxia and CPET which were performed once, before the race. Fast marathon performance and high VO2max were correlated with: low ventilatory responsiveness to hypoxia (r =  − 0.53, r = 0.67, respectively) and pre-race BHT (r =  − 0.47, r = 0.51, respectively), (1) greater SD of beat-to-beat SBP (all p < 0.05). Fast performance was related with an enhanced pre-race vascular response to BHT (r =  − 0.59, p = 0.005). The variables found by other studies to predict the marathon performance in younger men: post-competition vasodilation, sympathetic vasomotor tone (LF-BPV) and HRV were not associated with the individual performance in our population. The results suggest that PCheS (ventilatory response) predicts individual performance (marathon time and VO2max) in men aged ≥ 50 yeat. Although cause-effect relationship including the role of peripheral chemoreceptors in restraining the post-competition vasodilation via the sympathetic vasoconstrictor outflow may be hypothesized to underline these findings, the lack of correlation between individual performance and both, the post-competition vasodilation and the sympathetic vasomotor tone argues against such explanation. Vascular responsiveness to breath-holding appears to be of certain value for predicting individual performance in this population, however.

Peer Effects on Individual Performance in a Team Sport

2021 ◽  
pp. 152700252110003
Author(s):  
Mariia Molodchik ◽  
Sofiia Paklina ◽  
Petr Parshakov
Keyword(s):  
Video Game ◽  
Peer Effects ◽  
Team Sport ◽  
Individual Performance ◽  
Team Cohesion ◽  
Soccer Players ◽  
Marginal Benefit ◽  
The Individual

The paper investigates the variety of peer effects on individual performance in a team sport. The individual performance of more than 5,000 soccer players, from 234 teams, between 2010 and 2015, is measured with the help of the FIFA video game simulator developed by EA Sports. The study reveals positive peer effects on individual performance although the marginal benefit decreases. Additionally, team cohesion contributes to an improvement of players’ ranking.

scholarly journals RR1. Safety of Carotid Stenting (CAS) Is Based on the Center Experience More than on the Individual Performance

2012 ◽  
Vol 55 (6) ◽  
pp. 85S-86S ◽  
Author(s):  
Gianbattista Parlani ◽  
Paola De Rango ◽  
Fabio Verzini ◽  
Enrico Cieri ◽  
Gioele Simonte ◽  
...  
Keyword(s):  
Carotid Stenting ◽  
Individual Performance ◽  
The Individual

A comparison of the compressibilities of some gases with that of nitrogen at pressures below one atmosphere

1950 ◽  
Vol 200 (1061) ◽  
pp. 201-218 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Differential Method ◽  
Linear Extrapolation ◽  
Volume Changes ◽  
Pure Nitrogen ◽  
Molecular Weights ◽  
Nitrous Oxide Oxygen ◽  
The Individual ◽  
Straight Lines ◽  
High Degree

A differential method for comparing the compressibilities of gases at pressures below 1 atm. has been developed in which many of the errors inherent in methods employed previously have been to a large extent eliminated, especially those due to meniscus volume changes and capillary depression. Using pure nitrogen as a standard the low-pressure isothermals of carbon monoxide, carbon dioxide, nitrous oxide, oxygen, ethylene and propane have been determined at a temperature of 22-05° C. The deviations of the individual points from straight lines do not in most cases exceed 2 parts in 100,000. In no case, even with propane, was any curvature in the isotherms detectable. The contention of Moles and other recent workers that the molecular weights of liquefiable gases can be determined to a high degree of accuracy by linear extrapolation is rendered highly probable by this fresh evidence.

Performance Prediction for Automotive Turbocharger Compressors

1975 ◽  
Vol 189 (1) ◽  
pp. 557-565 ◽  
Author(s):  
A. Whitfield ◽  
F. J. Wallace
Keyword(s):  
Performance Prediction ◽  
Flow Analysis ◽  
Compressor Stage ◽  
Thermodynamic Models ◽  
Flow Rates ◽  
Design Point ◽  
One Dimensional ◽  
Dimensional Flow ◽  
Performance Map ◽  
The Individual

A procedure to predict the complete performance map of turbocharger centrifugal compressors is presented. This is based on a one-dimensional flow analysis using existing published loss correlations that were available and thermodynamic models to describe the incidence loss and slip factor variation at flow rates which differ from the design point. To predict the losses within the complete compressor stage using a one-dimensional flow procedure, it is necessary to introduce a number of empirical parameters. The uncertainty associated with these empirical parameters is assessed by studying the effect of varying them upon the individual losses and upon the overall predicted performance.

The Effect of Pursed - Lip Breathing Exercise Vs Diaphragmatic Breathing in Stabilizing the Vitals after 6-MWT among Overweight Individuals

2021 ◽  
Vol 9 (VIII) ◽  
pp. 299-308
Author(s):  
Dr. Jaya Chandra
Keyword(s):  
Carbon Dioxide ◽  
Data Collection ◽  
Null Hypothesis ◽  
Deep Breathing ◽  
Diaphragmatic Breathing ◽  
Breathing Exercise ◽  
Breathing Exercises ◽  
Paired Samples ◽  
The Individual ◽  
Harmful Effects

When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, your breathing has to increase from about 15 times a minute (12 litres of air) when you are resting, up to about 40–60 times a minute (100 litres of air) during exercise. Your circulation also speeds up to take the oxygen to the muscles so that they can keep moving. Any kind of exertion causes some change in vitals. Some amount of fluctuation in vitals after any kind of exertion occurs in every individual and is considered to be normal. But if there is extreme fluctuation in vitals even after mild or moderate form of exertion, it indicates some kind of abnormality or an increased stress on cardiovascular or respiratory system and needs attention.In any case if the vitals fluctuate during any kind of exertion it needs to be stabilized so that its harmful effects can be avoided. For these breathing exercises have been proven to be very beneficial. There are several types of breathing exercises such as deep breathing, diaphragmatic breathing, pursed lip breathing, etc. The need for the study is to compare the effectiveness of Pursed-Lip Breathing & Diaphragmatic Breathing exercise instabilizing the vitals after 6 MWT in young individuals. The objective of this study is to measure the exertion level of the individual, to assess the effect of pursed lip and diaphragmatic breathing exercises on vitals after exertion and also the comparison of both techniques. In the present study we took 60 subjects from saaii college, Kanpur. Method of data collection is random and study design is comparative study with study duration of 4 weeks. Subjects were divided into two equal groups. The paired samples t-test shows significant changes observed i.e., null hypothesis is rejected and alternate hypothesis is accepted and we observed that significant improvement along with effectiveness of pursed lip breathing on stabilizing vitals in overweight individuals.

CO2 Reduction to CH4 on Cu-doped Phosphorene: A First-Principles Study

Nanoscale ◽  
2021 ◽  
Author(s):  
Hongping Zhang ◽  
Run Zhang ◽  
Chenghua Sun ◽  
Yan Jiao ◽  
Yaping Zhang
Keyword(s):  
Carbon Dioxide ◽  
Metal Atom ◽  
First Principles ◽  
Materials Science ◽  
2D Materials ◽  
Co2 Reduction ◽  
Carbon Dioxide Reduction ◽  
First Principles Study

Electrochemical carbon dioxide reduction (CRR) to fuels is one of the significant challenges in materials science and chemistry. Recently, single metal atom catalysts based on 2D materials provide a promising...

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