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Title:

ANALYSIS Design and development of a measuring method for environmental sustainability in food production systems

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These days, sustainability is a key issue for many private companies that address their sustainable corporate performance (SCP). The perspective is essential for their license to operate and forms the basis for business principles and practices. The lack of internationally accepted reporting standards on what, when and where to report makes it d...

These days, sustainability is a key issue for many private companies that address their sustainable corporate performance (SCP). The perspective is essential for their license to operate and forms the basis for business principles and practices. The lack of internationally accepted reporting standards on what, when and where to report makes it difficult to assess sustainability, however. Moreover, measuring tools providing information on SCP are only the first step towards sustainability. To prevent negative effects of operations being transferred from one company to another, the second step is the development of a system-based approach for all companies that contribute to an end product. This paper presents the findings of a study about the use of environmental indicators for food production and proposes a measuring method for environmental sustainability in food production systems. The study shows that environmental SCP often focuses on events at a local level. The enormous number of indicators found in the literature generates too much data that often provide no additional knowledge on the environmental sustainability of a system. Moreover, although environmental research has addressed many aspects of sustainability, it has often ignored interactions. Overall environmental implications of food production are therefore poorly understood. The proposed measuring method uses three indicators that address global environmental issues: the use of energy (from both fossil and renewable sources), land and water. The systemic approach can calculate trade-offs along supply chains that make up a production system. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2014-11-24

Source:

http://www.utwente.nl/ctw/wem/organisatie/medewerkers/gerbens/ee2003.pdf

http://www.utwente.nl/ctw/wem/organisatie/medewerkers/gerbens/ee2003.pdf Minimize

Document Type:

text

Language:

en

DDC:

333 Economics of land & energy *(computed)*

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March 2001

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This Project Is ; T. Kram ; D. J. Gielen ; A. J. M. Bos ; T. Gerlagh ; B. J. Groenendaal ; H. C. Moll ; M. E. Bouwman ; B. W. Daniëls ; P. Groenewegen ; ...

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In industrialized regions like OECD Europe, today the production and processing of a limited number of bulk materials represents the lion's share of industrial energy consumption and emis- sions of greenhouse gases (GHGs) from the sector. Most current studies of future options to reduce GHG emissions fail to encompass the options, limitations an...

In industrialized regions like OECD Europe, today the production and processing of a limited number of bulk materials represents the lion's share of industrial energy consumption and emis- sions of greenhouse gases (GHGs) from the sector. Most current studies of future options to reduce GHG emissions fail to encompass the options, limitations and interactions between commonly ad- dressed energy system changes and innovative ways to meet the future demands for material goods. Although approaches like Life Cycle Analysis (LCA) and Material Flow Analysis (MFA) are developed and applied with this very goal in mind, it is argued here that only a fully interlinked and dynamic systems approach, covering energy and material flows can reveal the merits of op- tions like new material processes, substitution, recycling and re-use and changes in product design. To this end a new model is built, drawing upon widely adopted energy systems models like MARKAL, but integrating material flows and the specific challenges posed by the dynamics of materials and products. The resulting MATTER model draws upon a series of in-depth studies of key groups of materials (metals, organic chemicals and building materials) and product groups (packaging, buildings, road vehicles). These in-depth studies address current situation and trends and new possibilities and trends in a detailed way, accounting for the specific conditions and prac- tices of the sectors involved. As such they provide valuable overviews in their own right. At the same time, more generalized and stylized information is extracted for specification of the MATTER model. Together, the sector studies and the overall integrated model analyses give com- plementary insights in longer-term prospects for GHG emission mitigation associated d. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-04-17

Source:

ftp://ftp.ecn.nl/pub/www/library/report/2001/c01017.pdf

ftp://ftp.ecn.nl/pub/www/library/report/2001/c01017.pdf Minimize

Document Type:

text

Language:

en

DDC:

670 Manufacturing *(computed)*

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

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Title:

Generalized Bernoulli numbers and a formula of Lucas

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An overlooked formula of E. Lucas for the generalized Bernoulli numbers is proved using generating functions. This is then used to provide a new proof and a new form of a sum involving classical Bernoulli numbers studied by K. Dilcher. The value of this sum is then given in terms of the Meixner-Pollaczek polynomials.

An overlooked formula of E. Lucas for the generalized Bernoulli numbers is proved using generating functions. This is then used to provide a new proof and a new form of a sum involving classical Bernoulli numbers studied by K. Dilcher. The value of this sum is then given in terms of the Meixner-Pollaczek polynomials. Minimize

Year of Publication:

2014-02-12

Document Type:

text

Subjects:

Mathematics - Number Theory

Mathematics - Number Theory Minimize

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On polynomials connected to powers of Bessel functions

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The series expansion of a power of the modified Bessel function of the first kind is studied. This expansion involves a family of polynomials introduced by C. Bender et al. New results on these polynomials established here include recurrences in terms of Bell polynomials evaluated at values of the Bessel zeta function. A probabilistic version of...

The series expansion of a power of the modified Bessel function of the first kind is studied. This expansion involves a family of polynomials introduced by C. Bender et al. New results on these polynomials established here include recurrences in terms of Bell polynomials evaluated at values of the Bessel zeta function. A probabilistic version of an identity of Euler yields additional recurrences. Connections to the umbral formalism on Bessel functions introduced by Cholewinski are established. Minimize

Year of Publication:

2013-06-05

Document Type:

text

Subjects:

Mathematical Physics

Mathematical Physics Minimize

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Title:

A probabilistic interpretation of a sequence related to Narayana polynomials

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A sequence of coefficients appearing in a recurrence for the Narayana polynomials is generalized. The coefficients are given a probabilistic interpretation in terms of beta distributed random variables. The recurrence established by M. Lasalle is then obtained from a classical convolution identity. Some arithmetical properties of the generalized...

A sequence of coefficients appearing in a recurrence for the Narayana polynomials is generalized. The coefficients are given a probabilistic interpretation in terms of beta distributed random variables. The recurrence established by M. Lasalle is then obtained from a classical convolution identity. Some arithmetical properties of the generalized coefficients are also established. Minimize

Year of Publication:

2012-02-06

Document Type:

text

Subjects:

Mathematics - Number Theory ; Mathematics - Combinatorics

Mathematics - Number Theory ; Mathematics - Combinatorics Minimize

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Title:

Epistasis in Maize (ZEA MAYS L.). II: Comparison of Selected with Unselected Populations

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Year of Publication:

1971-01

Document Type:

Text

Language:

en

Subjects:

Investigations

Investigations Minimize

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Title:

Identities for generalized Euler polynomials

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For $N \in \mathbb{N}$, let $T_{N}$ be the Chebyshev polynomial of the first kind. Expressions for the sequence of numbers $p_{\ell}^{(N)}$, defined as the coefficients in the expansion of $1/T_{N}(1/z)$, are provided. These coefficients give formulas for the classical Euler polynomials in terms of the so-called generalized Euler polynomials. Th...

For $N \in \mathbb{N}$, let $T_{N}$ be the Chebyshev polynomial of the first kind. Expressions for the sequence of numbers $p_{\ell}^{(N)}$, defined as the coefficients in the expansion of $1/T_{N}(1/z)$, are provided. These coefficients give formulas for the classical Euler polynomials in terms of the so-called generalized Euler polynomials. The proofs are based on a probabilistic interpretation of the generalized Euler polynomials recently given by Klebanov et al. Asymptotics of $p_{\ell}^{(N)}$ are also provided. Minimize

Year of Publication:

2014-01-30

Document Type:

text

Subjects:

Mathematics - Probability

Mathematics - Probability Minimize

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Title:

Kink instabilities in jets from rotating magnetic fields

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We have performed 2.5D and 3D simulations of conical jets driven by the rotation of an ordered, large-scale magnetic field in a stratified atmosphere. The simulations cover about three orders of magnitude in distance to capture the centrifugal acceleration as well as the evolution past the Alfven surface. We find that the jets develop kink insta...

We have performed 2.5D and 3D simulations of conical jets driven by the rotation of an ordered, large-scale magnetic field in a stratified atmosphere. The simulations cover about three orders of magnitude in distance to capture the centrifugal acceleration as well as the evolution past the Alfven surface. We find that the jets develop kink instabilities, the characteristics of which depend on the velocity profile imposed at the base of the flow. The instabilities are especially pronounced with a rigid rotation profile, which induces a shearless magnetic field. The jet's expansion appears to be limiting the growth of Alfven mode instabilities. ; Comment: 10 pages, 13 figures, accepted for publication in A&A Minimize

Year of Publication:

2008-09-18

Document Type:

text

Subjects:

Astrophysics

Astrophysics Minimize

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Title:

Using network-flow techniques to solve an optimization problem from surface-physics

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The solid-on-solid model provides a commonly used framework for the description of surfaces. In the last years it has been extended in order to investigate the effect of defects in the bulk on the roughness of the surface. The determination of the ground state of this model leads to a combinatorial problem, which is reduced to an uncapacitated, ...

The solid-on-solid model provides a commonly used framework for the description of surfaces. In the last years it has been extended in order to investigate the effect of defects in the bulk on the roughness of the surface. The determination of the ground state of this model leads to a combinatorial problem, which is reduced to an uncapacitated, convex minimum-circulation problem. We will show that the successive shortest path algorithm solves the problem in polynomial time. ; Comment: 8 Pages LaTeX, using Elsevier preprint style (macros included) Minimize

Year of Publication:

1996-04-09

Document Type:

text

Subjects:

Condensed Matter

Condensed Matter Minimize

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Title:

THE p-ADIC VALUATION OF STIRLING NUMBERS

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Abstract. Let p> 2 be a prime. The p-adic valuation of Stirling numbers of the second kind is analyzed. Two types of tree diagrams that encode this information are introduced. Conditions that describe the infinite branching of these trees, similar to the case p = 2, are presented. 1.

Abstract. Let p> 2 be a prime. The p-adic valuation of Stirling numbers of the second kind is analyzed. Two types of tree diagrams that encode this information are introduced. Conditions that describe the infinite branching of these trees, similar to the case p = 2, are presented. 1. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-10-21

Source:

http://www.ma.utexas.edu/users/aberrizbeitia/p-adic-Stir.pdf

http://www.ma.utexas.edu/users/aberrizbeitia/p-adic-Stir.pdf Minimize

Document Type:

text

Language:

en

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

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