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Papel como fonte alternativa para produção anaeróbia de hidrogênio; Paper as an alternative source for anaerobic production

Botta, Lívia Silva
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 22/03/2012 PT
Relevância na Pesquisa
35.73%
O objetivo desse trabalho foi avaliar a produção de 'H IND.2' a partir da degradação de papel sulfite com a utilização de consórcio microbiano obtido do fluido ruminal, na presença e ausência da celulase. Para obtenção de consórcio de bactérias essencialmente produtoras de ' H IND.2', fluido de rúmen in natura, utilizado como inóculo, foi submetido a tratamento ácido (pH 3 por 24 h), e posteriormente enriquecido em meio de cultura Del Nery modificado em diluições seriais. Nos ensaios de produção de 'H IND.2' foi utilizado 10% (v/v) desse inóculo em reatores com diferentes concentrações de papel e celulase, e em reatores controle, nos quais não houve adição de celulase. Reator anaeróbio em batelada, em triplicata, com papel sulfite e meio Del Nery modificado, foi mantido a 37 ºC, pH inicial 7,0, com headspace preenchido com 'N IND.2' (100%) para os seguintes ensaios: (1) 0,5 g papel/L e 4 mL celulase/L; (2) 2,0 g papel/L e 15 mL celulase/ L; (3) 4,0 g papel/L e 30 mL celulase/L; (CT 1) 0,5 g papel/L; (CT 2) 2,0 g papel/L; (CT 3) 4,0 g papel/L. Os rendimentos de 'H IND.2' foram 42, 26,6 e 24 mmol' H IND.2'/g papel para os ensaios 1, 2 e 3, respectivamente. Não houve produção de 'H IND.2' nos reatores controle. O consumo de substrato...

Caracterização e avaliação do potencial energético dos resíduos florestais da indústria de papel e celulose = : Characterization and energy potential assessment of the forestry residues from the paper and pulp industry; Characterization and energy potential assessment of the forestry residues from the paper and pulp industry

Gabriel Pena Vergara
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 26/02/2014 PT
Relevância na Pesquisa
35.7%
A indústria de papel e celulose é a principal consumidora de biomassa como combustível e como matéria-prima, gerando resíduos de biomassa, os quais representam uma grande quantidade de energia disponível. A produção de papel e celulose necessita de grandes quantidades de energia tanto mecânica quanto térmica, a qual usualmente é produzida através da queima de biomassa. Além dos resíduos gerados na própria indústria, a cadeia de produção de papel e celulose envolve uma importante atividade florestal, da qual é aproveitada a madeira e geralmente deixando no campo resíduos de biomassa, os quais representam entre 15 e 25% da massa seca da árvore. Este trabalho de pesquisa enfoca-se na caracterização como combustível dos resíduos sólidos gerados no campo (folhas, cascas, galhos e pontas) e na produção de papel e celulose (finos, cascas, cavacos e lodo orgânico). Também é estimado o potencial de geração de energia elétrica pela combustão dos resíduos de biomassa através do ciclo Rankine. A caracterização baseia-se em uma serie de análises pelos quais é estudada a degradação térmica (análises térmicas - TGA e DSC), e determinada a composição elementar, imediata e estrutural, poder calorífico e massa específica. São caracterizadas também as cinzas determinando sua composição elementar. O material empregado é proveniente do gênero eucalipto espécie Urograndis. As biomassas estudadas apresentam-se propriadas para ser empregadas como combustível em fornalhas industriais. Os resíduos florestais e os rejeitos de madeira da fábrica têm algumas desvantagens em relação a outras biomassas como a madeira. Estas desvantagens são o teor de cinzas...

Development of paper-based devices, using a simple phase separation process for the fabrication of biomimetic superhydrophobic paper substrates

Sousa, Maria José Peixoto de
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Trabalho de Conclusão de Curso
Publicado em //2012 ENG
Relevância na Pesquisa
35.81%
Dissertação de mestrado integrado em Engenharia Biomédica; For the last two decades, biomimetic superhydrophobic materials have been acquiring huge interest for distinct application fields such as textile and glass industries, biomedical in vivo devices and microfluidic systems. Different methodologies and materials have been employed to fabricate these substrates, prevailing in literature the use of complex processes with non biodegradable and costly materials. In recent years, paper has emerged as a promising material for microfluidic and lab-onchip devices, presenting interesting properties such as extreme availability, low-cost, flexibility and ability to be devised in different manners. Also the possibility to be functionalized and chemically modified allows researchers to exploit different techniques to pattern the paper surface, such as photolithography, plasma treatment and printing approaches. So far, the related literature is confined in the creation of hydrophobic-hydrophilic contrast and only a few works have reported the fabrication of superhydrophobic paper-based platforms. Inspired by nature, the work presented in this thesis suggested the fabrication of paper substrates with water repellent properties to employ in a great range of possible applications. Biomimetic superhydrophobic paper surfaces were obtained with a simple phase separation methodology using poly(hydroxybutyrate). Scanning electron microscopy (SEM)...

Superhydrophobic paper in the development of disposable labware and lab-on-paper devices

Sousa, M. P.; Mano, J. F.
Fonte: American Chemical Society Publicador: American Chemical Society
Tipo: Artigo de Revista Científica
Publicado em //2013 ENG
Relevância na Pesquisa
45.64%
Traditionally in superhydrophobic surfaces history, the focus has frequently settled on the use of complex processing methodologies using nonbiodegradable and costly materials. In light of recent events on lab-on-paper emergence, there are now some efforts for the production of superhydrophobic paper but still with little development and confined to the fabrication of flat devices. This work gives a new look at the range of possible applications of bioinspired superhydrophobic paper-based substrates, obtained using a straightforward surface modification with poly(hydroxybutyrate). As an end-of-proof of the possibility to create lab-on-chip portable devices, the patterning of superhydrophobic paper with different wettable shapes is shown with low-cost approaches. Furthermore, we suggest the use of superhydrophobic paper as an extremely low-cost material to design essential nonplanar lab apparatus, including reservoirs for liquid storage and manipulation, funnels, tips for pipettes, or accordion-shaped substrates for liquid transport or mixing. Such devices take the advantage of the self-cleaning and extremely water resistance properties of the surfaces as well as the actions that may be done with paper such as cut, glue, write, fold...

The ‘M2 DASH’—Manchester-Modified Disabilities of Arm Shoulder and Hand Score

Khan, Wasim S.; Jain, Rohit; Dillon, Bernice; Clarke, Lawrence; Fehily, Max; Ravenscroft, Mark
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
35.63%
The Disability of the Arm, Shoulder, and Hand (DASH) questionnaire was originally designed as a measure of disability in patients with disorders of the upper limb, but the DASH score is also affected by disability because of lower limb disorders. The aim of this study was to investigate the construct validity of the DASH questionnaire and to create a revised DASH questionnaire, the Manchester-modified or M2 DASH, with fewer questions that is more specific to the upper limb. Patients were asked to fill in the DASH questionnaire in a fracture clinic after ethical approval. This included 79 patients with upper limb injuries, 61 patients with lower limb injuries, and 52 control subjects. The mean DASH scores for the three groups varied significantly, and the lower limb group had a mean score of 16. The M2 DASH questionnaire was developed using questions more specific to the upper limb and included questions 1–4, 6, 13–17, 21–23, and 26–30 from the original questionnaire. The mean M2 DASH score for the lower limb group was 9 and, unlike the original DASH score, was not statistically different from the control group. The M2 DASH scores were then calculated for the upper limb group and a correlation study showed highly significant correlation between the original DASH scores and the M2 DASH scores. Our study shows that the original DASH questionnaire is not specific for the upper limb. The M2 DASH questionnaire has the advantage of being more specific for the upper limb than the DASH questionnaire...

Ethanol production of semi-simultaneous saccharification and fermentation from mixture of cotton gin waste and recycled paper sludge

Shen, Jiacheng; Agblevor, Foster A.
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
45.55%
Ethanol production from the steam-exploded mixture of 75% cotton gin waste and 25% recycled paper sludge in various conditions was investigated by semi-simultaneous saccharification and fermentation (SSSF) consisting of a pre-hydrolysis and a simultaneous saccharification and fermentation (SSF). Four cases were studied: 24-h pre-hydrolysis + 48-h SSF (SSSF 24), 12-h pre-hydrolysis + 60-h SSF (SSSF 12), 72-h SSF, and 48-h hydrolysis + 24-h fermentation (SHF). The ethanol concentration, yield, and productivity of SSSF 24 were higher than those of the other operations. A model of SSF was used to simulate the data for four components in SSF. The analysis of the reaction rates of cellobiose, glucose, cell, and ethanol using the model and the parameters from the experiments showed that there was a transition point of the rate-controlling step at which the cell growth control in the initial 2 h was changed to the cellobiose reaction control in later period during ethanol production of SSF from the mixture.

Short communication: inhibiting biofilm formation on paper towels through the use of selenium nanoparticles coatings

Wang, Qi; Webster, Thomas J
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
35.64%
Bacterial infections are commonly found on paper towels and other paper products, leading to the potential spread of bacteria and consequent health concerns. The objective of this in vitro study was to introduce antibacterial properties to standard paper towel surfaces by coating them with selenium nanoparticles. Scanning electron microscopy was used to measure the size and distribution of the selenium coatings on the paper towels. Atomic force microscopy was used to measure the surface roughness of paper towels before and after they were coated with selenium nanoparticles. The amount of selenium precipitated on the paper towels was measured by atomic absorption spectroscopy. In vitro bacterial studies with Staphylococcus aureus were conducted to assess the effectiveness of the selenium coating at inhibiting bacterial growth. Results showed that the selenium nanoparticles coated on the paper towel surface were well distributed with semispherical geometries about 50 nm in diameter. Most importantly, the selenium nanoparticle-coated paper towels inhibited S. aureus growth by 90% after 24 and 72 hours compared with the uncoated paper towels. Thus, the study showed that nanoparticle selenium-coated paper towels may lead to an increased eradication of bacteria in a wider range of clinical environments and in the food industry...

Citation Patterns of a Controversial and High-Impact Paper: Worm et al. (2006) “Impacts of Biodiversity Loss on Ocean Ecosystem Services”

Branch, Trevor A.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 20/02/2013 EN
Relevância na Pesquisa
35.71%
Citation patterns were examined for Worm et al. 2006 (Science 314∶787–790), a high-impact paper that focused on relationships between marine biodiversity and ecosystem services. This paper sparked much controversy through its projection, highlighted in the press release, that all marine fisheries would be collapsed by 2048. Analysis of 664 citing papers revealed that only a small percentage (11%) referred to the 2048 projection, while 39% referred to fisheries collapse in general, and 40% to biodiversity and ecosystem services. The 2048 projection was mentioned more often in papers published soon after the original paper, in low-impact journals, and in journals outside of fields that would be expected to focus on biodiversity. Citing papers also mentioned the 2048 projection more often if they had few authors (28% of single-author papers vs. 2% of papers with 10 or more authors). These factors suggest that the more knowledgeable the authors of citing papers were about the controversy over the 2048 projection, the less likely they were to refer to it. A noteworthy finding was that if the original authors were also involved in the citing papers, they rarely (1 of 55 papers, 2%) mentioned the 2048 projection. Thus the original authors have emphasized the broader concerns about biodiversity loss...

Influence of Long Term Irrigation with Pulp and Paper Mill Effluent on the Bacterial Community Structure and Catabolic Function in Soil

Tripathi, Binu Mani; Kumari, Priyanka; Weber, Kela P.; Saxena, Anil Kumar; Arora, Dilip Kumar; Kaushik, Rajeev
Fonte: Springer India Publicador: Springer India
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
35.62%
Microbial communities play a vital role in maintaining soil health. A multiphasic approach to assess the effect of pulp and paper mill effluent on both the structure and function of microbial soil communities is taken. Bacterial communities from agricultural soils irrigated with pulp and paper mill effluent were compared to communities form soils irrigated with well water. Samples were taken from fields in the state of Uttarakhand, India, where pulp and paper mill effluent has been used for irrigation for over 25 years. Comparisons of bacterial community structure were conducted using sequencing of the 16S rRNA gene from both isolates and clone libraries attained from the soil. Community-level physiological profiling was used to characterize the functional diversity and catabolic profile of the bacterial communities. The multiphasic approach using both physiological and molecular techniques proved to be a powerful tool in evaluating the soil bacterial community population and population differences therein. A significant and consistent difference in the population structure and function was found for the bacterial communities from soil irrigated with effluent in comparison to fields irrigated with well water. The diversity index parameters indicated that the microbial community in pulp and paper mill effluent irrigated fields were more diverse in both structure and function. This suggests that the pulp and paper mill effluent is not having a negative effect on the soil microbial community...

Layer-by-layer paper-stacking nanofibrous membranes to deliver adipose-derived stem cells for bone regeneration

Wan, Wenbing; Zhang, Shiwen; Ge, Liangpeng; Li, Qingtao; Fang, Xingxing; Yuan, Quan; Zhong, Wen; Ouyang, Jun; Xing, Malcolm
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
Publicado em 12/02/2015 EN
Relevância na Pesquisa
35.63%
Bone tissue engineering through seeding of stem cells in three-dimensional scaffolds has greatly improved bone regeneration technology, which historically has been a constant challenge. In this study, we researched the use of adipose-derived stem cell (ADSC)-laden layer-by-layer paper-stacking polycaprolactone/gelatin electrospinning nanofibrous membranes for bone regeneration. Using this novel paper-stacking method makes oxygen distribution, nutrition, and waste transportation work more efficiently. ADSCs can also secrete multiple growth factors required for osteogenesis. After the characterization of ADSC surface markers CD29, CD90, and CD49d using flow cytometry, we seeded ADSCs on the membranes and found cells differentiated, with significant expression of the osteogenic-related proteins osteopontin, osteocalcin, and osteoprotegerin. During 4 weeks in vitro, the ADSCs cultured on the paper-stacking membranes in the osteogenic medium exhibited the highest osteogenic-related gene expressions. In vivo, the paper-stacking scaffolds were implanted into the rat calvarial defects (5 mm diameter, one defect per parietal bone) for 12 weeks. Investigating with microcomputer tomography, the ADSC-laden paper-stacking membranes showed the most significant bone reconstruction...

Respiration and metabolism of the resting European paper wasp (Polistes dominulus)

Käfer, Helmut; Kovac, Helmut; Oswald, Barbara; Stabentheiner, Anton
Fonte: Springer Berlin Heidelberg Publicador: Springer Berlin Heidelberg
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
45.55%
The European paper wasp, Polistes dominulus Christ, is an abundant wasp species in South and Central Europe which dispersed to the north in recent times. Polistes dominulus exhibits an energy-extensive mode of life, spending much time resting at the nest, which should be reflected in adaptations regarding gas exchange and standard metabolism. We analysed the resting metabolism (CO2 emission) of Polistes dominulus workers in the ambient temperature range an individual may be exposed to during a breeding season (Ta = 2.4–40.6 °C) via flow through respirometry. Behaviour and endothermic activity were assessed by infrared thermography. With rising Ta, CO2 release followed an exponential increase from 27 to 149 and 802 nl g−1 min−1 at Ta = 3, 20 and 35 °C, respectively. Measurements of the thermal regime at the nest showed that resting P. dominulus are most of the time in the lower range of their standard metabolic curve. A comparison with a “highly energetic” wasp like Vespula sp. revealed that Polistes dominulus not only optimises behaviour but also reduces metabolism to save energy. The CO2 emission patterns changed with ambient temperature, from discontinuous (≤25 °C) to cyclic (25–36 °C) and continuous gas exchange at higher temperatures. A pronounced break appeared in the data progression regarding cycle frequency and CO2 emission per gas exchange cycle between 15 and 10 °C. This striking change in gas exchange features indicates a physiological adaptation to special respiratory requirements at low temperatures.

Le document technologique original dans le droit de la preuve au Québec

de Saint-Exupéry, Gilles
Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
FR
Relevância na Pesquisa
35.64%
L’adoption de la Loi concernant le cadre juridique des technologies de l’information en 2001 a permis de mettre en place un cadre juridique favorisant l’intégration des technologies de l’information dans le droit. Plus particulièrement en droit de la preuve, cela a conféré au document technologique la qualité d’élément de preuve. Dans ce contexte il a été nécessaire d’adapter certains articles du Code civil du Québec et du même fait certaines règles dont la règle de la meilleure preuve, telle que prévue à l’article 2860 C.c.Q.. Cette règle s’appuyait jusqu’à présent sur la notion d’original, notion propre au support papier dont il a fallu trouver un équivalent pour le document technologique. C’est ce qu’a fait la Loi en prévoyant à son article 12 les caractéristiques de l’original technologique. Nous nous penchons sur cette notion en regardant quelles sont ses origines et ses justifications, puis nous avons analysé l’article 12 de la Loi qui traite de l’original sous forme technologique. Enfin nous nous sommes interrogé sur la place des reproductions dans le contexte technologique et nous avons vu que celles-ci ont pris de plus en plus d’importance à côté du document original...

The role of asymmetries in rock-paper-scissors biodiversity models.

Timpanaro, André M.; Grebogi, Celso; Moura, Alessandro P. S. de
Fonte: Águas de Lindóia Publicador: Águas de Lindóia
Tipo: Aula
ENG
Relevância na Pesquisa
35.66%
The maintenance of biodiversity is a long standing puzzle in ecology. It is a classical result that if the interactions of the species in an ecosystem are chosen in a random way, then complex ecosystems can't sustain themselves, meaning that the structure of the interactions between the species must be a central component on the preservation of biodiversity and on the stability of ecosystems. The rock-paper-scissors model is one of the paradigmatic models that study how biodiversity is maintained. In this model 3 species dominate each other in a cyclic way (mimicking a trophic cycle), that is, rock dominates scissors, that dominates paper, that dominates rock. In the original version of this model, this dominance obeys a 'Z IND 3' symmetry, in the sense that the strength of dominance is always the same. In this work, we break this symmetry, studying the effects of the addition of an asymmetry parameter. In the usual model, in a two dimensional lattice, the species distribute themselves according to spiral patterns, that can be explained by the complex Landau-Guinzburg equation. With the addition of asymmetry, new spatial patterns appear during the transient and the system either ends in a state with spirals, similar to the ones of the original model...

A clarification on the debate on "the original Schwarzschild solution"

Corda, Christian
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
35.73%
Now that English translations of Schwarzschild's original paper exist, that paper has become accessible to more people. Historically, the so-called "standard Schwarzschild solution" was not the original Schwarzschild's work, but it is actually due to J. Droste and, independently, H. Weyl, while it has been ultimately enabled like correct solution by D. Hilbert. Based on this, there are authors who claim that the work of Hilbert was wrong and that Hilbert's mistake spawned black-holes and the community of theoretical physicists continues to elaborate on this falsehood, with a hostile shouting down of any and all voices challenging them. In this paper we re-analyse "the original Schwarzschild solution" and we show that it is totally equivalent to the solution enabled by Hilbert. Thus, the authors who claim that "the original Schwarzschild solution" implies the non existence of black holes give the wrong answer. We realize that the misunderstanding is due to an erroneous interpretation of the different coordinates. In fact, arches of circumference appear to follow the law dl = rd{\phi}, if the origin of the coordinate system is a non-dimensional material point in the core of the black-hole, while they do not appear to follow such a law...

Erratum to "The Homogeneous Coordinate Ring of a Toric Variety", along with the original paper

Cox, David A.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.77%
This submission consists of two papers: 1) an erratum that corrects an error in the proof of Proposition 4.3 in my paper "The Homogeneous Coordinate Ring of a Toric Variety", and 2) the original (unchanged) version of the paper, published in 1995. The original paper introduced the homogeneous coordinate ring of a toric variety (now called the total coordinate ring or Cox ring) and gave a quotient construction. The paper also studied sheaves on a toric variety, and in Section 4 described its automorphism group. The error in the proof of Proposition 4.3 resulted from the faulty assumption that a certain set of graded endomorphisms forms a ring; rather, it is a monoid under composition. The erratum notes this error and gives a correct proof of the proposition.; Comment: Erratum: 6 pages, LaTeX; Original paper: 28 pages, TeX C Version 3.0 with AMS fonts

Alan M. Turing: Paper on Statistics of Repetitions

Taylor, Ian
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
35.69%
This is a typeset version of Alan Turing's declassified Second World War paper \textit{Paper on Statistics of Repetitions}. See the companion paper, \textit{The Applications of Probability to Cryptography}, also available from arXiv at arXiv:1505.04714, for Editor's Notes.; Comment: This update re-formats two figures to give a closer representation of the underlying text. The original paper is available from the National Archives in the UK at www.nationalarchives.gov.uk using reference number HW 25/38. 4 pages, two column format, complete text of original paper

Translation of Michael Sadowsky's paper "The differential equations of the M\"obius band"

Hinz, Denis F.; Fried, Eliot
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
35.66%
This article is a translation of Michael Sadowsky's original paper "Die Differentialgleichungen des M\"obiusschen Bandes." in Jahresbericht der Deutschen Mathematiker-Vereinigung 39 (2. Abt. Heft 5/8, Jahresversammlung vom 16. bis 23. September), 49-51 (1929), which is a short version of his paper "Theorie der elastisch biegsamen undehnbaren B\"ander mit Anwendungen auf das M\"obiussche Band" in 3. internationaler Kongress f\"ur technische Mechanik, Stockholm, 1930.; Comment: 4 pages, to appear in a special volume of the Journal of Elasticity entitled "The Mechanics of Ribbons and M\"obius Bands", citations of this translation should refer also to Sadowsky's original paper, as cited in the Abstract

Translation of Michael Sadowsky's paper "An elementary proof for the existence of a developable M\"obius band and the attribution of the geometric problem to a variational problem"

Hinz, Denis F.; Fried, Eliot
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
35.64%
This article is a translation of Michael Sadowsky's original paper "Ein elementarer Beweis f\"ur die Existenz eines abwickelbaren M\"obiusschen Bandes und die Zur\"uckf\"uhrung des geometrischen Problems auf ein Variationsproblem." which appeared in Sitzungsberichte der Preussischen Akademie der Wissenschaften, physikalisch-mathematische Klasse, 17. Juli 1930, Mitteilung vom 26. Juni, 412-415. Published on September 12, 1930.; Comment: 5 pages, 3 figures, to appear in a special volume of the Journal of Elasticity entitled "The Mechanics of Ribbons and M\"obius Bands", citations of this translation should refer also to Sadowsky's original paper, as cited in the Abstract

Translation and interpretation of Michael Sadowsky's paper "Theory of elastically bendable inextensible bands with applications to the M\"obius band"

Hinz, Denis F.; Fried, Eliot
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
35.74%
This article is a translation of Michael Sadowsky's original paper "Theorie der elastisch biegsamen undehnbaren B\"ander mit Anwendungen auf das M\"obiussche Band" in 3. internationaler Kongress f\"ur technische Mechanik, Stockholm, 1930. The translation is augmented by an Appendix containing an interpretation of the last section of Sadowsky's original paper including figures generated from recent numerical simulations.; Comment: 12 pages, 2 original figures, 2 supplementary figures, to appear in a special volume of the Journal of Elasticity entitled "The Mechanics of Ribbons and M\"obius Bands", citations of this translation should refer also to Sadowsky's original paper, as cited in the Abstract

Print media paper consumption patterns through a system dynamics approach

Tejada Abreu, Alicia
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
35.63%
As awareness of the current unsustainable state of our society increases, it has become evident that immediate action is needed to change this state. Many of the ecological changes that threaten the long-term survival of humans and of other species have anthropogenic origins. Industry's impact and its role in mitigating these impacts is the focus of much discussion and debate. Two industries that are working to deal with these issues are the printing and paper industries. The environmental impacts associated with the entire life-cycle of paper are significant, yet the socially redeeming value of the content printed can be equally as significant. A curious paradox is that advances in information and communication technology (ICT) have long been predicted to lead to a reduction in media use, resulting in the so-called paperless office, but this has not been the case. Until recently, the observed trends worldwide demonstrate that in most countries paper consumption has been on the rise, however in some developed countries there is some suggestion that this trend may be reversing. The work of Sellen and Harper (2002) provides a qualitative explanation of why paper consumption is on the rise. Nonetheless, there is little research that develops quantitative models to explain paper consumption patterns. This thesis leverages Sellen and Harper's qualitative models to develop a system dynamics model to explain the effects and interactions between ICT...