scholarly journals Impact induced mechanical damage of Agria potato tubers cultivated in different regimes

2012 ◽  
Vol 52 (No. 3) ◽  
pp. 81-86
Author(s):  
J. Blahovec ◽  
A. Hejlová ◽  
J. Vacek
Keyword(s):  
Field Experiment ◽  
Mechanical Damage ◽  
Potato Tubers ◽  
Flat Side ◽  
Black Spots ◽  
Pendulum Test ◽  
The Impact

The Agria potato tubers were grown in 2005 in cultivation regimes involving different irrigation and fertilisation levels and forms. The impact induced tuber damage was simulated dynamically by an impact pendulum test and studied with the aim to detect some relationship between the cultivation regimes and the type and extent of the damage. The usual bruising presented as black spots is in many cases masked by other mechanisms of damage, e.g. by tuber cracking and/or crushing. The highest degree of tuber cracking and at the same time the least frequent bruising were observed for tubers cultivated in the regime with irrigation and without fertilising. The bruising was more pronounced in the narrower tuber side in comparison to the wider flat side in all cultivation regimes. Some results could be compared with similar previous measurements performed on tubers from the same field experiment organised during three successive years 2003–2005. The flatter side parts of the Agria tubers are more sensitive to bruising than the more oblique ones. The bruise spot shape depends mainly on its dimension. The role of different cultivation regimes can be interpreted in this way.

scholarly journals Impact induced mechanical damage of Agria potato tubers

2012 ◽  
Vol 51 (No. 2) ◽  
pp. 39-43 ◽  
Author(s):  
J. Blahovec
Keyword(s):  
Potato Variety ◽  
Impact Test ◽  
Mechanical Damage ◽  
The Other ◽  
Pig Slurry ◽  
Potato Tubers ◽  
Irrigation Regimes ◽  
Other Hand ◽  
Flat Side

Potato variety Agria was cultivated in different fertilisation and/or irrigation regimes. Tuber damage after impact was studied two months after the harvest with aim to find some relation between the regime of cultivation and impact test tuber damage. It was found that tuber cracking and/or crushing belongs to the most frequent mechanisms of damage masking usual bruising in many cases. Most severe tuber cracking was observed for cultivation with irrigation and classical methods of fertilisation. On the other hand, bruising was most frequent in case without any irrigation and fertilisation and in cases used for fertilisation the pig slurry. In every cultivation regime the bruising was more pronounced in narrower tuber side in comparison to the wider flat side.

scholarly journals The Role of Mindset in Education : A Large-Scale Field Experiment in Disadvantaged Schools

2021 ◽  
Author(s):  
Elise Huillery ◽  
Adrien Bouguen ◽  
Axelle Charpentier ◽  
Yann Algan ◽  
Coralie Chevallier
Keyword(s):  
Field Experiment ◽  
Experimental Evidence ◽  
Large Scale ◽  
Cost Effective ◽  
Growth Mindset ◽  
Disadvantaged Schools ◽  
Scale Field ◽  
Large Scale Field ◽  
The Impact

This article provides experimental evidence of the impact of a four-year inter-vention aimed at developing students’ growth mindset and internal locus ofcontrol in disadvantaged middle schools. We find a 0.07 standard deviationincrease in GPA, associated with a change in students’ mindset, improved be-havior as reported by teachers and school registers, and higher educational andprofessional aspirations. International empirical benchmarks reveal that theintervention is at least ten times more cost-effective than the typical educa-tional intervention. However, while reducing between-school inequality whentargeted to disadvantaged schools, the program benefits less to more fragilestudents, therefore increasing within-school inequality.

The Effect of Advertising on Consumer Price Sensitivity

1985 ◽  
Vol 22 (2) ◽  
pp. 119-129 ◽  
Author(s):  
Lakshman Krishnamurthi ◽  
S. P. Raj
Keyword(s):  
Panel Data ◽  
Field Experiment ◽  
High Sensitivity ◽  
High Price ◽  
Price Sensitivity ◽  
Additional Support ◽  
Advertising Content ◽  
Purchase Quantity ◽  
The Impact

The authors investigate how increased advertising affects consumer price sensitivity. First, a conceptual framework integrating the role of advertising content is presented. Next, a methodology for studying the impact of advertising on consumer price sensitivity to brand purchase quantity and consumption is developed. Analyses of diary panel data for an established, frequently purchased brand from an ADTEL advertising field experiment clearly demonstrate that increased advertising lowers price sensitivity. Further, this effect is strong in the high price sensitivity segment for purchase quantity and consumption. In the low price sensitivity segment the effect is marginal. Additional support for these results was obtained by choosing different cutoff points for high sensitivity segmentation.

The Role of Leaders in Democratic Deliberations: Results from a Field Experiment in São Tomé and Príncipe

2006 ◽  
Vol 58 (4) ◽  
pp. 583-622 ◽  
Author(s):  
Macartan Humphreys ◽  
William A. Masters ◽  
Martin E. Sandbu
Keyword(s):  
Decision Making ◽  
Field Experiment ◽  
Democratic Deliberation ◽  
Leader Influence ◽  
Sao Tome And Principe ◽  
Decision Making Processes ◽  
The Impact ◽  
Political Decision Making ◽  
Rare Opportunity

Despite a widespread trend toward the adoption of increasingly participatory approaches to political decision making in developing countries, there is little or no evidence that these practices in fact return the benefits attributed to them. This article investigates one specific worry—that participatory decision-making processes may be vulnerable to manipulation by elites. The authors report on a field experiment, drawing on a unique nationwide experiment in democratic deliberation in São Tomé and Príncipe in which the discussion leaders were randomly assigned across meetings. The randomization procedure provides a rare opportunity to identify the impact of leaders on the outcomes of group deliberations. They find that leader effects were extremely large, in many cases accounting for over one-third of all variation in the outcomes of the national discussions. These results have important implications for the design of such deliberative practices. While the total effect of leadership cannot be assessed, it may still be possible to observe when leader influence occurs and to correct for leader effects in comparisons of outcomes across deliberations.

scholarly journals ON THE ISSUE OF DAMAGE TO POTATOES DURING HARVESTING AND STORAGE

2021 ◽  
pp. 136-142
Author(s):  
Д.В. КОЛОШЕИН ◽  
Н.В. ЦЫГАНОВ ◽  
Л.А. МАСЛОВА ◽  
С.Н. КУЛЬКОВ
Keyword(s):  
Potato Variety ◽  
Mechanical Damage ◽  
Biological Factor ◽  
Potato Tubers ◽  
Technical Factor ◽  
Potato Varieties ◽  
Shock Absorbers ◽  
The Impact ◽  
And Storage ◽  
Fall Height

Проблема и цель. Целью проводимого исследования является снижение механических повреждений в процессе погрузки, перевозки клубней и закладке картофеля на хранение. Методология. Повреждения клубней влияют на лежкость картофеля при хранении. Для достижения цели исследования были определены в соответствии со стандартами предельно допустимые значения энергии удара и высоты падения клубней. Анализ факторов, влияющих на появление повреждений клубней картофеля, позволил группе авторов предложить классификацию основных факторов. Дальнейший анализ показал, что факторы или причины, влияющие на появление повреждений у клубней картофеля, делятся на несколько основных видов. Биологический фактор возникновения повреждений клубней картофеля, как показывает практика, можно минимизировать за счет районирования сортов картофеля (использование наиболее пригодных сортов картофеля для машинной уборки) и соблюдения технологии уборки урожая. Технический фактор в первую очередь зависит от конструктивных особенностей картофелеуборочной техники. Результаты. Проведенные исследования позволили уточнить причины механических повреждений клубней, получаемых при закладке на хранение картофеля в контейнеры. Были определены также размерно-массовые характеристики сорта картофеля «Гала» Заключение. По итогам проведенных исследований было определено, что при загрузке контейнеров и хранении картофеля, а также с целью снижения повреждений клубней необходимо применять различные типы гасителей ударной нагрузки. Самым простым гасителем будут являться ремни из прорезиненной ткани, с креплением по краям контейнера. Problem and goal. The purpose of the study is to reduce mechanical damage during loading, transportation of tubers and laying potatoes for storage. Methodology. Damage to the tubers afects the shelf life of potatoes during storage. Thus, in order to achieve the goal of the study, the maximum permissible values of the impact energy and the fall height of the tubers were determined in accordance with the standards. For this purpose, a group of authors proposed a classifcation of factors that afect the appearance of damage to potato tubers. The analysis of the factors allowed us to identify the classifcation of the necessary factors that afect the appearance of mechanical damage. Further analysis showed that the factors or causes that afect the appearance of damage in potato tubers are divided into several main types. The biological factor of damage to potato tubers, as practice shows, can be minimized by zoning potato varieties (using the most suitable potato varieties for machine harvesting) and compliance with harvesting technology. The technical factor, as practice shows, primarily depends on the design features of potato harvesting equipment. Results. The conducted research allowed us to clarify the causes of mechanical damage to tubers obtained when storing potatoes in containers. The size and mass characteristics of the potato variety "Gala" were also determined» Conclusion. Based on the results of the conducted studies, it was determined that various types of shock absorbers should be used to load containers and store potatoes, as well as to reduce damage to tubers. The simplest extinguisher will be belts made of rubberized fabric, with fastening at the edges of the container.

Intergroup Threat and Outgroup Attitudes

2013 ◽  
Vol 44 (5) ◽  
pp. 311-319 ◽  
Author(s):  
Marco Brambilla ◽  
David A. Butz
Keyword(s):  
Gay Men ◽  
Social Group ◽  
Welfare Recipients ◽  
Intergroup Attitudes ◽  
Social Policies ◽  
Intergroup Threat ◽  
Economic Threat ◽  
The Impact ◽  
General Climate

Two studies examined the impact of macrolevel symbolic threat on intergroup attitudes. In Study 1 (N = 71), participants exposed to a macrosymbolic threat (vs. nonsymbolic threat and neutral topic) reported less support toward social policies concerning gay men, an outgroup whose stereotypes implies a threat to values, but not toward welfare recipients, a social group whose stereotypes do not imply a threat to values. Study 2 (N = 78) showed that, whereas macrolevel symbolic threat led to less favorable attitudes toward gay men, macroeconomic threat led to less favorable attitudes toward Asians, an outgroup whose stereotypes imply an economic threat. These findings are discussed in terms of their implications for understanding the role of a general climate of threat in shaping intergroup attitudes.

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