Carbon Dioxide Concentration in Commercial Potato Storages and its Effect on Quality of Tubers for Processing

1988 ◽  
Vol 21 (4) ◽  
pp. 363
Author(s):  
A.J. Siemens ◽  
G. Mazza
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Concentration ◽  
Commercial Potato

Analysis of Carbon Dioxide in Kindergartens in Poland

2017 ◽  
Author(s):  
Katarzyna Gładyszewska-Fiedoruk ◽  
Sebastian Jachimowicz
Keyword(s):  
Carbon Dioxide ◽  
Mechanical Ventilation ◽  
Eastern Europe ◽  
Carbon Dioxide Concentration ◽  
Considerable Improvement ◽  
Permissible Level ◽  
Main Determinants ◽  
Stack Ventilation ◽  
Indoor Conditions

Children in kindergartens spend between five and ten hours a day, the quality of air inside is very important. Kindergartens are public buildings. Kindergartens in Poland do not have mechanical ventilation, most often use stack ventilation, which is frequently aided by airing. The three considered buildings were located in eastern Europe. The main objective of the research was to evaluate the interior conditions, especially with regard to carbon dioxide concentration. In the afternoon, the permissible level of carbon dioxide concentration was substantially exceeded (by 190% at the most in first series of measurement). The present research has resulted in considerable improvement of indoor conditions in the analyzed kindergartens (less than 140% in third series of measurement). The presence of children and ventilation habits seemed to be the main determinants of IAQ and carbon dioxide.

scholarly journals Method for Estimation of CO2 Gains from Persons in Builidings

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1309 ◽  
Author(s):  
Antonio Rodero ◽  
Dorota Anna Krawczyk
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Carbon Dioxide Concentration ◽  
Co2 Concentration ◽  
Males And Females ◽  
Sources Of Co2

Carbon dioxide concentration is an important parameter to know Indoor Air Quality of a building. One of the most important sources of CO2 in poor ventilated building is human activity. This work presents a method for experimental determination of human CO2 generation rate based on measuring of time evolution of indoor CO2 concentration. The method is applied to 5 rooms of an educational building from Bialystok (Poland). Similar carbon dioxide gains were obtained in all rooms, around 0.0046 L/s, which correspond to theoretical CO2 generation rates of a sedentary activity for persons, males and females, between 21–30 years old, characteristics of occupants of analyzed rooms.

scholarly journals Simulation and Analysis of Various Ventilation Systems Given in an Example in the Same School of Indoor Air Quality

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2845 ◽  
Author(s):  
Katarzyna Gładyszewska-Fiedoruk ◽  
Vasyl Zhelykh ◽  
Andrii Pushchinskyi
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Carbon Dioxide Concentration ◽  
Additional Energy ◽  
Exhaust Ventilation ◽  
Building Ventilation ◽  
The Cost

The quality of internal air is one of the factors that affect the pace and quality of knowledge acquisition. Therefore, it is important that classrooms have high quality of air. Using computer simulation, the effect of various building ventilation variants on air quality in classrooms was analyzed. Two criteria were analyzed and six variants of ventilation. The analysis was carried out using the CONTAMW program, used for multi-zone analysis of ventilation and air quality in a building. As an indicator of air quality, the concentration of carbon dioxide in school halls was adopted. The analyses show that natural ventilation is not able to provide proper air exchange. Regular airing of classrooms during breaks can reduce the carbon dioxide concentration to 2500 ppm, however, there is a significant reduction in indoor temperature (even below 10 °C). The best control over the internal environment can be obtained by using a supply–exhaust ventilation system with heat recovery. Obtaining a higher stabilization of ventilation is achieved by supplying additional energy to drive fans, however, this is only a small amount of energy compared to the cost of heat for heating the building (maximum 2%).

Quality Evaluation of Strawberries Packed with Perforated Film

2012 ◽  
Vol 200 ◽  
pp. 451-454
Author(s):  
Zu Ju Shu ◽  
Sheng Quan Liu ◽  
Yan Yuan ◽  
Ye Bao Xia
Keyword(s):  
Carbon Dioxide ◽  
Quality Evaluation ◽  
Carbon Dioxide Concentration ◽  
Principal Component ◽  
Quality Parameters ◽  
Low Oxygen ◽  
High Carbon ◽  
Perforated Film ◽  
High Carbon Dioxide

Strawberries were stored in perforated film packages with different number and diameter of perforation for 5 days at 18°C simulating the ordinary logistics in Hefei. The non-perforated film packages were used as the control. Several quality parameters of strawberries were determined and analyzed everyday during storage. The principal component analysis was applied to the comprehensive assessment of strawberry quality. The results showed that suitable diameter and number of perforation could maintain strawberry quality. The comprehensive quality of strawberries packed in perforated film with 36 perforations of diameter 0.5mm was the best, followed by the ones packed in non-perforated film with internal atmosphere of low oxygen and high carbon dioxide concentration.

scholarly journals Carbon dioxide quantified by the infrared in respiratory activity evaluation in corn seeds

2017 ◽  
Vol 38 (3) ◽  
pp. 1115
Author(s):  
João Alexandre Lopes Dranski ◽  
Marlene De Matos Malavasi ◽  
Ubirajara Contro Malavasi ◽  
Ivan Schuster ◽  
Norma Schlickmann Lazaretti
Keyword(s):  
Carbon Dioxide ◽  
Respiratory Activity ◽  
Carbon Dioxide Concentration ◽  
Correlation Coefficients ◽  
Reference Method ◽  
Accuracy And Precision ◽  
Physiological Quality ◽  
Detection Chamber ◽  
Different Levels

The respiratory activity is one of the first biological manifestations of vigor loss and detecting it can help the monitoring and quality control of seed production by seed industries. This research aimed to develop and validate the methodology of the carbon dioxide concentration in the evaluation of physiological quality of Zea mays (L.) seeds. The proposed method is grounded on the measurement of the CO2 content by infrared through a drag system and exhaustion of the gas released by the seed maintained in a closed system up to the detection chamber of the gas meter. Samples of 15, 20 and 25 seeds of 6 lots of cultivar CD 384 Hx were incubated at temperatures of 15, 25 and 40 °C. The CO2 content released after 1, 3, 6, 9, 12 and 24 h of incubation were quantified. In parallel, the percentage of normal seedlings emerged in the field were evaluated. The simple correlation coefficients among tests were calculated. After determining the reading conditions, the accuracy and precision of the proposed method were evaluated, using 15 seed lots. For the evaluation of the respiratory activity in Z. mays seeds, we recommend a sample of 25 seeds, incubated at 15 °C for a maximum of 12 h, which allows to classify lots with different levels of vigor and predict the establishment of seedlings in the field, being the appropriate method for measuring CO2 as it externalizes precision between successive measurements and agreement to the reference method.

Communication: Photoinduced Carbon Dioxide Binding with Surface-Functionalized Silicon Quantum Dots

2018 ◽  
Author(s):  
Oscar A. Douglas-Gallardo ◽  
Cristián Gabriel Sánchez ◽  
Esteban Vöhringer-Martinez
Keyword(s):  
Carbon Dioxide ◽  
Quantum Dots ◽  
Atmospheric Carbon Dioxide ◽  
Density Functional ◽  
Tight Binding ◽  
Carbon Dioxide Concentration ◽  
Research Area ◽  
Silicon Quantum Dots ◽  
Dependent Model ◽  
Photoinduced Charge

<div> <div> <div> <p>Nowadays, the search of efficient methods able to reduce the high atmospheric carbon dioxide concentration has turned into a very dynamic research area. Several environmental problems have been closely associated with the high atmospheric level of this greenhouse gas. Here, a novel system based on the use of surface-functionalized silicon quantum dots (sf -SiQDs) is theoretically proposed as a versatile device to bind carbon dioxide. Within this approach, carbon dioxide trapping is modulated by a photoinduced charge redistribution between the capping molecule and the silicon quantum dots (SiQDs). Chemical and electronic properties of the proposed SiQDs have been studied with Density Functional Theory (DFT) and Density Functional Tight-Binding (DFTB) approach along with a Time-Dependent model based on the DFTB (TD-DFTB) framework. To the best of our knowledge, this is the first report that proposes and explores the potential application of a versatile and friendly device based on the use of sf -SiQDs for photochemically activated carbon dioxide fixation. </p> </div> </div> </div>

Hyperspectral characteristics and leaf area index monitoring of rice (Oryza sativa L.) under carbon dioxide concentration enrichment

2021 ◽  
Vol 54 (3) ◽  
pp. 231-243
Author(s):  
Chao Liu ◽  
Zhenghua Hu ◽  
Rui Kong ◽  
Lingfei Yu ◽  
Yuanyuan Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Oryza Sativa ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Oryza Sativa L ◽  
Carbon Dioxide Concentration ◽  
Area Index
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