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Search Results: 1 - 10 of 6225 matches for " Vincent Zoes "
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Growth and yield of tomato cultivated on composted duck excreta enriched wood shavings and source-separated municipal solid waste
Vincent Zoes,Théophile Paré,Henri Dinel,Stefano Dumontet
Italian Journal of Agronomy , 2011, DOI: 10.4081/ija.2011.e2
Abstract: A greenhouse experiment was conducted to evaluate the use of growth substrates, made with duck excreta enriched wood shaving compost (DMC) and the organic fraction of source-separated municipal solid waste (MSW) compost, on the growth and yield of tomato (Lycopersicum esculentum Mill. cv. Campbell 1327). Substrate A consisted of 3:2 (W/W) proportion of DMC and MSW composts. Substrates B and C were the same as A but contained 15% (W/W ratio) of brick dust and shredded plastic, respectively. Three control substrates consisted of the commercially available peat-based substrate (Pr), an in-house sphagnum peat-based substrate (Gs), and black earth mixed with sandy loam soil (BE/S) in a 1:4 (W/W) ratio. Substrates (A, B, C) and controls received nitrogen (N), phosphate (P) and potassium (K) at equivalent rates of 780 mg/pot, 625 mg/pot, and 625 mg/pot, respectively, or were used without mineral fertilizers. Compared to the controls (Pr, Gs and BE/S), tomato plants grown on A, B, and C produced a greater total number and dry mass of fruits, with no significant differences between them. On average, total plant dry-matter biomass in substrate A, B, and C was 19% lower than that produced on Pr, but 28% greater than biomass obtained for plant grown, on Gs and BE/S. Plant height, stem diameter and chlorophyll concentrations indicate that substrates A, B, and C were particularly suitable for plant growth. Although the presence of excess N in composted substrates favoured vegetative rather than reproductive growth, the continuous supply of nutrients throughout the growing cycle, as well as the high water retention capacity that resulted in a reduced watering by 50%, suggest that substrates A, B, and C were suitable growing mixes, offering environmental and agronomic advantages.
Eigenvector Sensitivity: A Kharitonov Result  [PDF]
Vincent Winstead
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.32024

This study is motivated by a need to effectively determine the difference between a system fault and normal system operation under parametric uncertainty using eigenstructure analysis. This involves computational robustness of eigenvectors in linear state space systems dependent upon uncertain parameters. The work involves the development of practical algorithms which provide for computable robustness measures on the achievable set of eigenvectors associated with certain state space matrix constructions. To make connections to a class of systems for which eigenvalue and characteristic root robustness are well understood, the work begins by focusing on companion form matrices associated with a polynomial whose coefficients lie in specified intervals. The work uses an extension of the well known theories of Kharitonov that provides computational efficient tests for containment of the roots of the polynomial (and eigenvalues of the companion matrices) in desirable regions, such as the left half of the complex plane.

Dealing with Complex Management Problems  [PDF]
Vincent Omachonu
Open Journal of Business and Management (OJBM) , 2014, DOI: 10.4236/ojbm.2014.21002
Abstract: Dealing with Complex Management Problems
The Unemployment Volatility Puzzle: A Note on the Role of Reference Points  [PDF]
Vincent Boitier
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.51013
Abstract: This theoretical note aims at studying the role of reference points in generating unemployment volatility. For this purpose, I introduce the notion of reference points in a standard Mortensen-Pissarides model. I obtain two results. First, I find that the obtained model is similar to the one found by Pissarides in 2009. Second, I show that the introduction of reference points can increase significantly unemployment volatility through a mechanism à la Hagerdorn and Manovskii.
Review Article: Remote Sensing, Surface Residue Cover and Tillage Practice  [PDF]
Obade Vincent de Paul
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.32026
Abstract: A growing world population and possible liquid fuel energy shortages are likely to result in worldwide agricultural intensification, and the possible expansion of non-sustainable practices. The adoption of non-sustainable practices could result in the loss of currently productive land, with potential impacts on human welfare and economic viability. One of the easiest techniques to maintain productivity is to maintain surface soil organic matter. However, developing reliable, cost effective and accurate methods for quantifying and monitoring crop residue cover (a major source of soil organic matter) that remains on top of the soil over large spatial extents constitutes a significant challenge. This article reviews potential remote sensing approaches for estimating surface residue cover with a view to mapping tillage practice.
Managerial Skills, Financial Capability and Strategic Planning in Organizations  [PDF]
Vincent Bagire, Juliana Namada
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.35055

This study sought to establish the relationship between managerial skills, financial capability and the level of strategic planning. The study was premised on the increasing focus on strategic planning in Ugandan organizations. There was however, a lack of local empirical studies on the factors driving this trend. Data were obtained from organizations in various sectors that included government institutions, private and family business organizations. The findings confirmed that organizations were involved in significant level of strategic planning. There was a positive and significant relationship with managerial skills. However, there was a very weak relationship with the financial capability. The implication of the findings for management was to give more attention to managerial skills to ensure congruence of operations.

An Integrative Framework for Customizations on Satisfaction: The Case of an Online Jewelry Business in China  [PDF]
Vincent Cho, Candy Lau
Journal of Service Science and Management (JSSM) , 2014, DOI: 10.4236/jssm.2014.72013

Upon the technological advancement of production flexibility, supply chain agility, and customer behavioral tracking, many online businesses now develop their customization strategies. In this regard, this study proposes an integrative framework for customization of product information, transaction handling, product attribute, and sales’ service. We are interested in how these customizations affect customer satisfaction. From our web-based survey on a renowned online jewelry company in China, we collected 1383 responses from its customer database. Our findings showed that information, product and sales’ service customizations have significant influence on customer satisfaction. Moreover, ordinary members as compared with VIP members feel more satisfied once they receive customized services.

Minkowski Sum of Polytopes Defined by Their Vertices  [PDF]
Vincent Delos, Denis Teissandier
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.31008

Minkowski sums are of theoretical interest and have applications in fields related to industrial backgrounds. In this paper we focus on the specific case of summing polytopes as we want to solve the tolerance analysis problem described in [1]. Our approach is based on the use of linear programming and is solvable in polynomial time. The algorithm we developed can be implemented and parallelized in a very easy way.

Interest Rate Volatility: A Consol Rate Approach  [PDF]
Vincent Brousseau, Alain Durré
Journal of Mathematical Finance (JMF) , 2015, DOI: 10.4236/jmf.2015.51006
Abstract: In this paper, we propose a new methodology to estimate the volatility of interest rates in the euro area money market. In particular, our approach aims at avoiding the limitations of market implied volatilities, i.e. the dependency on arbitrary choices in terms of maturity and frequencies and/or of other factors like credit and liquidity risks. The measure is constructed as the implied instantaneous volatility of a consol bond that would be priced on the EONIA swap curve over the sample period from 4 January 1999 to 21 November 2013. Our findings show that this measure tracks well the historical volatility since, by dividing the consol excess returns by our volatility measure. This removes nearly entirely excess of kurtosis and volatility clustering, bringing the excess returns close to an ordinary Gaussian white noise.
Inferring Volatility from the Yield Curve  [PDF]
Vincent Brousseau, Alain Durré
Journal of Mathematical Finance (JMF) , 2015, DOI: 10.4236/jmf.2015.53026
Abstract: In this paper, we assess how to recover the volatility of interest rates in the euro area money market, on the sole basis of the zero-coupon yield curve. Our primary result is that there exists an empirical regularity (linking rates and volatility) that takes a relatively simple mathematical form. We also show that the existence of such regularity cannot be explained by a reasoning based on the hypothesis of absence of opportunities of arbitrage since a continuous-time arbitrage-free model may produce instances of curves that are consistent with a continuum of level of volatilities. We exhibit an example for this.
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