Organic hydroponics: a US reality challenging the traditional concept of “organic” and “soilless” cultivation

2021 ◽  
pp. 275-282 ◽  
Author(s):  
F. Di Gioia ◽  
E.N. Rosskopf
Keyword(s):  
Traditional Concept ◽  
Soilless Cultivation

How to Correct for Chance Agreement in the Estimation of Sensitivity and Specificity of Diagnostic Tests

1994 ◽  
Vol 33 (02) ◽  
pp. 180-186 ◽  
Author(s):  
H. Brenner ◽  
O. Gefeller
Keyword(s):  
Sensitivity And Specificity ◽  
Disease Status ◽  
Disease Prevalence ◽  
Small Sample ◽  
Small Samples ◽  
Interval Estimate ◽  
Traditional Concept ◽  
Interval Estimates ◽  
Major Disadvantage ◽  
Test Result

Abstract:The traditional concept of describing the validity of a diagnostic test neglects the presence of chance agreement between test result and true (disease) status. Sensitivity and specificity, as the fundamental measures of validity, can thus only be considered in conjunction with each other to provide an appropriate basis for the evaluation of the capacity of the test to discriminate truly diseased from truly undiseased subjects. In this paper, chance-corrected analogues of sensitivity and specificity are presented as supplemental measures of validity, which pay attention to the problem of chance agreement and offer the opportunity to be interpreted separately. While recent proposals of chance-correction techniques, suggested by several authors in this context, lead to measures which are dependent on disease prevalence, our method does not share this major disadvantage. We discuss the extension of the conventional ROC-curve approach to chance-corrected measures of sensitivity and specificity. Furthermore, point and asymptotic interval estimates of the parameters of interest are derived under different sampling frameworks for validation studies. The small sample behavior of the estimates is investigated in a simulation study, leading to a logarithmic modification of the interval estimate in order to hold the nominal confidence level for small samples.

The build of nonlinear quantum mechancs and variations of feature of microscopic particles as well as their experimental affirmation

2014 ◽  
Vol 5 (3) ◽  
pp. 871-981 ◽  
Author(s):  
Pang Xiao Feng
Keyword(s):  
Wave Function ◽  
Quantum Mechanics ◽  
Lagrange Equation ◽  
Minimum Principle ◽  
Superposition Principle ◽  
Type Equation ◽  
Experimental Results ◽  
Traditional Concept ◽  
Nonlinear Quantum ◽  
Nonlinear Quantum Mechanics

We establish the nonlinear quantum mechanics due to difficulties and problems of original quantum mechanics, in which microscopic particles have only a wave feature, not corpuscle feature, which are completely not consistent with experimental results and traditional concept of particle. In this theory the microscopic particles are no longer a wave, but localized and have a wave-corpuscle duality, which are represented by the following facts, the solutions of dynamic equation describing the particles have a wave-corpuscle duality, namely it consists of a mass center with constant size and carrier wave, is localized and stable and has a determinant mass, momentum and energy, which obey also generally conservation laws of motion, their motions meet both the Hamilton equation, Euler-Lagrange equation and Newton-type equation, their collision satisfies also the classical rule of collision of macroscopic particles, the uncertainty of their position and momentum is denoted by the minimum principle of uncertainty. Meanwhile the microscopic particles in this theory can both propagate in solitary wave with certain frequency and amplitude and generate reflection and transmission at the interfaces, thus they have also a wave feature, which but are different from linear and KdV solitary wave’s. Therefore the nonlinear quantum mechanics changes thoroughly the natures of microscopic particles due to the nonlinear interactions. In this investigation we gave systematically and completely the distinctions and variations between linear and nonlinear quantum mechanics, including the significances and representations of wave function and mechanical quantities, superposition principle of wave function, property of microscopic particle, eigenvalue problem, uncertainty relation and the methods solving the dynamic equations, from which we found nonlinear quantum mechanics is fully new and different from linear quantum mechanics. Finally, we verify further the correctness of properties of microscopic particles described by nonlinear quantum mechanics using the experimental results of light soliton in fiber and water soliton, which are described by same nonlinear Schrödinger equation. Thus we affirm that nonlinear quantum mechanics is correct and useful, it can be used to study the real properties of microscopic particles in physical systems.

Freiheit, Gleichheit, Sinnlichkeit–Jacques Rancière, Hegel und die holländische Malerei

2010 ◽  
Vol 55 (2) ◽  
Author(s):  
Leander Scholz
Keyword(s):  
Political Theory ◽  
French Revolution ◽  
Jacques Derrida ◽  
Traditional Concept ◽  
Jacques Ranciere ◽  
Jacques Rancière ◽  
Political Intervention ◽  
The French Revolution

Der Aufsatz geht der These nach, daß die Fundierung der politischen Theorie in einer ästhetischen Theorie bei Jacques Rancière eine Aktualisierung der Losung der Brüderlichkeit aus der Französischen Revolution darstellt. Diese Aktualisierung der Brüderlichkeit als »ästhetische Gemeinschaft« erlaubt es Rancière, an den Klassenbegriff von Marx anzuschließen, ohne die damit verbundene Gemeinschaftserfahrung begrifflich bestimmen und damit an positive Merkmale binden zu müssen. Weil Rancière seine Demokratietheorie vor allem als eine Interventionstheorie angelegt hat, soll die »ästhetische Gemeinschaft« im Unterschied zum Klassenbegriff es ermöglichen, eine prinzipiell unabgeschlossene Reihe von politischen Subjektivierungsprozessen zu denken. Um diese These zu schärfen, wird Rancières Demokratietheorie mit der von Jacques Derrida verglichen, der auf ganz ähnliche Weise das Demokratische der Demokratie in einem Streit gegeben sieht, der jenseits von demokratischen Spielregeln stattfindet, die Losung der Brüderlichkeit jedoch für überaus problematisch hält.<br><br>This article argues that the foundation of political theory in aesthetics by Jacques Rancière can be seen as an actualization of the slogan of fraternalism during the French Revolution. This actualization of fraternalism as »aesthetic community« gives Rancière the possibility to operate with the Marxian concept of classes without positively defining the experience of community. Because Rancière understands democracy as the chance for political intervention, the concept of an »aesthetic community« (as opposed to the traditional concept of classes) allows him to posit an endless process of political subjectification. To sharpen this argument, the article compares Rancière’s understanding of democracy to Jacques Derrida’s, who also focuses on a democratic struggle beyond democratic rules, but is very skeptical about the slogan of fraternalism.

Internet-based Online Higher Education in Nepal Amidst COVID-19

2020 ◽  
Author(s):  
Ashis Acharya ◽  
Nabaraj Poudyal ◽  
Ganesh Lamichhane ◽  
Babita Aryal ◽  
Bibek Raj Bhattarai ◽  
...  
Keyword(s):  
Higher Education ◽  
Human Life ◽  
The Internet ◽  
Online Classes ◽  
Traditional Concept ◽  
Digital Platforms ◽  
Factors Affecting ◽  
Online Higher Education ◽  
Alternative Means ◽  
The Government

The COVID-19 global pandemic has affected all aspects of human life, with education, not an exception. In an attempt to stop the SARS-CoV-2 spreading like wildfire, the Government of Nepal has implemented nationwide lockdowns since March 24, 2020, that have enforced schools and universities to shut down. As a consequence, more than four hundred thousand students of various levels in higher education institutions (HEIs) are in a dilemma about restoring the situation. Several HEIs, nationwide, have leaped forward from the traditional concept of learning—limited within the boundary of the classroom—to choosing digital platforms as an alternative means of teaching because of the pandemic. For this research, the descriptive and inferential analysis was carried out to investigate the effects and challenges of learning via digital platforms during this pandemic. Data were collected from students and faculty at various levels of higher education and analyzed statistically with different factors using t-test and ANOVA, and variables were found to be approximately normally distributed. The study revealed that 70% of the respondents had access to the Internet, but 36% of the Internet accessed did not continue online classes due to unexpected disturbance in Internet and electrical connectivity. Likewise, 65% of students did not feel comfortable with online classes, and among attendees of online classes, 78% of students want to meet the instructor for a better understanding of course matters. According to the analytic hierarchy process (AHP) model, three factors, such as institutional policy, internet access, and poverty, are found to be significant factors affecting the online higher education systems in Nepal. On the brighter side, this outbreak has brought ample opportunities to reform the conventional teaching-learning paradigm in Nepal.

scholarly journals Self-Configuring CVS to Discriminate Rocket Leaves According to Cultivation Practices and to Correctly Attribute Visual Quality Level

Agronomy ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1353
Author(s):  
Michela Palumbo ◽  
Bernardo Pace ◽  
Maria Cefola ◽  
Francesco Fabiano Montesano ◽  
Francesco Serio ◽  
...  
Keyword(s):  
Fruits And Vegetables ◽  
Irrigation Management ◽  
Classification Performance ◽  
Quality Level ◽  
Cultivation Conditions ◽  
Computer Vision Systems ◽  
Soilless Cultivation ◽  
Fertilization Level ◽  
Non Destructive

Computer Vision Systems (CVS) represent a contactless and non-destructive tool to evaluate and monitor the quality of fruits and vegetables. This research paper proposes an innovative CVS, using a Random Forest model to automatically select the relevant features for classification, thereby avoiding their choice through a cumbersome and error-prone work of human designers. Moreover, three color correction techniques were evaluated and compared, in terms of classification performance to identify the best solution to provide consistent color measurements. The proposed CVS was applied to fresh-cut rocket, produced under greenhouse soilless cultivation conditions differing for the irrigation management strategy and the fertilization level. The first aim of this study was to objectively estimate the quality levels (QL) occurring during storage. The second aim was to non-destructively, and in a contactless manner, identify the cultivation approach using the digital images of the obtained product. The proposed CVS achieved an accuracy of about 95% in QL assessment and about 65–70% in the discrimination of the cultivation approach.

scholarly journals Nutritional and Functional Evaluation of Inula crithmoides and Mesembryanthemum nodiflorum Grown in Different Salinities for Human Consumption

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4543
Author(s):  
Alexandre Lima ◽  
Florinda Gama ◽  
Viana Castañeda-Loaiza ◽  
Camila Costa ◽  
Lisa M. Schüler ◽  
...  
Keyword(s):  
Salt Stress ◽  
Vitamin B1 ◽  
Nutritional Composition ◽  
Human Consumption ◽  
Functional Evaluation ◽  
Cultivation System ◽  
Safe Production ◽  
Soilless Cultivation ◽  
Relative Productivity ◽  
Β Carotene

The nutritional composition and productivity of halophytes is strongly related to the biotic/abiotic stress to which these extremophile salt tolerant plants are subjected during their cultivation cycle. In this study, two commercial halophyte species (Inula crithmoides and Mesembryanthemum nodiflorum) were cultivated at six levels of salinity using a soilless cultivation system. In this way, it was possible to understand the response mechanisms of these halophytes to salt stress. The relative productivity decreased from the salinities of 110 and 200 mmol L−1 upwards for I. crithmoides and M. nodiflorum, respectively. Nonetheless, the nutritional profile for human consumption remained balanced. In general, I. crithmoides vitamin (B1 and B6) contents were significantly higher than those of M. nodiflorum. For both species, β-carotene and lutein were induced by salinity, possibly as a response to oxidative stress. Phenolic compounds were more abundant in plants cultivated at lower salinities, while the antioxidant activity increased as a response to salt stress. Sensory characteristics were evaluated by a panel of culinary chefs showing a preference for plants grown at the salt concentration of 350 mmol L−1. In summary, salinity stress was effective in boosting important nutritional components in these species, and the soilless system promotes the sustainable and safe production of halophyte plants for human consumption.

scholarly journals Making Sense of Our Working Lives: The concept of the career imagination

2021 ◽  
Vol 2 (2) ◽  
pp. 263178772110046
Author(s):  
Laurie Cohen ◽  
Joanne Duberley
Keyword(s):  
Traditional Concept ◽  
Continuity And Change ◽  
Making Sense ◽  
Structure And Agency ◽  
Working Lives ◽  
Key Dimensions ◽  
Short Termism

This essay considers how the traditional concept of career retains its power in an age of contingency, short-termism and gig work. To answer this question, it introduces and explicates the concept of the ‘career imagination’. This concept has three key dimensions: perceptions of enablement and constraint, time and identity. Situated in the nexus of structure and agency, it is through our career imagination that we envisage and evaluate the progress of our working lives. Encapsulating continuity and change, our career imagination helps us to understand the enduring legitimacy of the traditional career as a yardstick by which to measure success, and the emergence of new possibilities.

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