scholarly journals Impact of Production System on Quality Indices Distribution in Butterhead Lettuce: A Comparative Study among Open Field and Greenhouse

2013 ◽  
Vol 03 (06) ◽  
Author(s):  
Roura Sara I Moreira Maria del R
Keyword(s):  
Comparative Study ◽  
Open Field ◽  
Production System ◽  
Quality Indices ◽  
Butterhead Lettuce

A Comparative Study between Lean Construction and the Traditional Production System

2017 ◽  
Vol 29 ◽  
pp. 118-132 ◽  
Author(s):  
Mohamed Saad Bajjou ◽  
Anas Chafi ◽  
Abdelali En-Nadi
Keyword(s):  
Comparative Study ◽  
Construction Industry ◽  
Production System ◽  
Manufacturing Industry ◽  
Lean Construction ◽  
Value Stream Mapping ◽  
Great Ability ◽  
Construction Companies ◽  
Traditional Production ◽  
Traditional Construction

The growing context of globalization permanently increases pressure on the construction companies to improve their performances in order to resist to the constraints of competitiveness in the international market. It has become ineluctable to look for introducing a new alternative capable of bringing creative improvement to the traditional production system. This paper will relate mainly to the most relevant management techniques in the construction industry, and more specifically, the lean construction concept. Initially, we will determine the main characteristics of the construction industry compared to the manufacturing industry according to three levels: on-site production, one of a kind projects, and complexity. Subsequently, we will focus our attention on the main sources of waste in the construction industry. Finally, a rigorous comparative study will be carried out to show the contribution of the lean construction tools in the promotion of traditional construction especially at the level of the following factors: Creating value and eliminating waste; Planning and mutual coordination; Site organization. Lean construction as Last Planner System (LPS), Value Stream Mapping (VSM), Just-in-Time philosophy, Visual management (VM) and 5S have shown a great ability to improve the traditional production system through waste reduction, encouraging people involvement, ensuring a pull flow production, and promotion of a continuous improvement philosophy.

scholarly journals A Comparative Study of Field Nematode Communities over a Decade of Cotton Production in Australia

Agronomy ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 123
Author(s):  
Oliver Knox ◽  
David Backhouse ◽  
Vadakattu Gupta
Keyword(s):  
Comparative Study ◽  
Population Size ◽  
Production System ◽  
Parasitic Nematodes ◽  
Soil Nematode ◽  
Cotton Production ◽  
Plant Parasitic Nematodes ◽  
Soil Ecosystem ◽  
Genetically Modified Cotton ◽  
Plant Parasitic

Soil nematode populations have the potential to indicate ecosystem disturbances. In response to questions about nematode interactions with soilborne diseases and whether genetically modified cotton altered nematode populations, several fields in the Namoi cotton growing area of Australia were sampled between 2005 and 2007. No significant interactions were observed, but nematodes numbers were low and postulated to be due to the use of the nematicide aldicarb. Aldicarb was removed from the system in 2011 and in 2015 funding allowed some fields to be resampled to determine if there had been a change in the nematode numbers following aldicarb removal. No significant changes in the total nematode numbers were observed, implying that the removal of aldicarb had little impact on the total nematode population size. However, an increase in plant parasitic nematodes was observed in both fields, but the species identified and the levels of change were not considered a threat to cotton production nor driven solely by altered pesticide chemistry. Additionally, greater numbers of higher order coloniser-persisters in the 2015 samples suggests that the current cotton production system is less disruptive to the soil ecosystem than that of a decade ago.

A comparative study of ginseng berry production in a vertical farm and an open field

2019 ◽  
Vol 140 ◽  
pp. 111612
Author(s):  
Jai-Eok Park ◽  
Hyebin Kim ◽  
Junho Kim ◽  
Seon-Jun Choi ◽  
Jungyeob Ham ◽  
...  
Keyword(s):  
Comparative Study ◽  
Open Field

Energy efficiency of organic pear production in greenhouses in China

2010 ◽  
Vol 25 (3) ◽  
pp. 196-203 ◽  
Author(s):  
Yuexian Liu ◽  
Henning Høgh-Jensen ◽  
Henrik Egelyng ◽  
Vibeke Langer
Keyword(s):  
Energy Efficiency ◽  
Open Field ◽  
Production System ◽  
Production Systems ◽  
Energy Output ◽  
Land Area ◽  
Energy Productivity ◽  
Greenhouse Production ◽  
Solar Greenhouse ◽  
Area Unit

AbstractThe development of organic protected cultivation taking place in densely populated areas has raised the question whether it is an environmentally friendly production system. The present study investigated energy consumption of organic pear production in two production systems, namely in traditional Chinese solar greenhouses and in the open field. In both production systems, energy output/input ratio and energy productivity were used as indicators to determine the energy efficiency; yield, cost of production, net economic return per land area unit and benefit/cost ratio were used to evaluate economic productivity. The analysis results indicated that energy input and energy output per land area unit in the solar greenhouse were higher than in the open field; whereas energy efficiency in terms of output/input ratio and energy productivity were lower in the solar greenhouse than those in the open field. However, if energy input sequestered in the protected structure was excluded in the solar greenhouse production system, energy efficiency was higher in the greenhouse system than in the open-field system. Our analysis further showed that the economic costs, the yield, cost of production, gross product value and net income per land area unit in the greenhouse were more than twice as high as those in the open field due to a higher tree density and a premium price. However, the production taking place in the open field used a great share of renewable energy and higher energy efficiency, which may comply more with the principles of organic farming than the greenhouse production system.

scholarly journals Comparative study of objective and subjective parameters of accommodation in children with myopia

2021 ◽  
Vol 16 (3) ◽  
pp. 27-35
Author(s):  
E. P. Tarutta ◽  
N. A. Tarasova ◽  
E. N. Iomdina ◽  
S. V. Milash ◽  
G. A. Markosyan
Keyword(s):  
Comparative Study ◽  
Open Field ◽  
Closed Field ◽  
Maximum Value ◽  
Average Maximum ◽  
Subjective Measurements ◽  
Objectively Measured ◽  
Intellectual Level

AIM: The study aims to compare the results of objective parameters such as autorefractometers of the open field Grand Seiko and closed field TONOREF III. and the subjective parameters such as the positive of relative accommodation (PRA) and the amplitude of accommodation (AA). MATERIAL AND METHODS: 30 children (60 eyes) with low and moderate myopia (on average -2.96 0.17 D) aged from 8 to 12 years (on average 10.04 0.24 years) were examined. Subjective (PRA, AA) and objective parameters of binocular adaptation (BAO) and monocular adaptation (MAO) response on the Grand Seiko Binocular Open Field Autorefkeratometer WR - 5500K (Japan) and the AA on the automatic refractokeratotonometer pakhimetre TONOREF III (Nidek, Japan) were determined. RESULTS: The average of BAO and MAO at 33 cm was -1.93 0.04 D and 1.86 0.05 D, respectively. The average PRA was 1.5 0.16 D. The objectively measured average AA was 5.25 0.4 D. The average minimum AA value was -2.86 0.16 D, and the average maximum value was 8.11 0.46 D. The subjective AA on the Iksar device was on average 4.17 0.43 D; Amin, on average -3.77 0.26 D; Amax, on average was -7.94 0.59 D. CONCLUSION: The objective and subjective measurements of AA produced comparable results. BAO and MAO reflected other characteristics of accommodation, different from its amplitude, and characterized the adequacy of the accommodation response to a specific accommodation task. The advantage of objective accommodation is that it is independent of the patients responses and intellectual level.

Sign in / Sign up

Export Citation Format

Share Document