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Processo de aglomeração de farinha de banana verde com alto conteúdo de amido resistente em leito fluidizado pulsado.; Aglomeration process of green banana flour with high resistant starch content in pulsed fluidized bed.

Rayo Mendez, Lina Maria
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 01/03/2013 PT
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26.24%
A aglomeração de partículas é um processo muito usado na indústria, que permite melhorar as propriedades de instantaneização de produtos em pó sem alterar suas características nutricionais e sensoriais. O objetivo deste trabalho foi realizar o processo de aglomeração de partículas de farinha de banana verde com alto conteúdo de amido resistente, usando um leito fluidizado pulsado avaliando seu efeito sobre as características finais da farinha, para ser usada como ingrediente funcional na melhora do índice glicêmico e níveis de insulina plasmática no sangue. A matéria prima usada foi farinha de banana verde com alto conteúdo de amido resistente e um leito fluidizado, constituído com um sistema de pulsação proporcionado por uma válvula de esfera, trabalhando à frequência de 600 rpm. Solução de alginato de sódio (5 g/100 g, a 35°C) foi usada como agente ligante na atomização a uma vazão de 3,0 mL/min. As condições de processamento como temperatura, pressão, vazão de ar, e tempo total de processo, foram mantidas em 95°C, 1,0 bar, 0,3 m/s, 50 min., para amostras de 400 g. Resultados após o processo de aglomeração indicam que houve uma diminuição do teor de umidade, aumento do diâmetro médio das partículas e do índice de fluidez...

Effect of powder milling and dopant addition on the current-voltage characteristics of SnO2-based ceramics

Lacerda, W.; Las, W. C.; Cilense, M.; Varela, José Arana
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 138-143
ENG
Relevância na Pesquisa
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Non-linear electrical properties of SnO2-based ceramics were investigated as a function of powder agglomeration condition and as a function of dopant addition. All doped powders presented a single phase, cassiterite, as evidenced by X-ray diffraction analysis. The effect of milling was quite evident, with non-milled powder showing higher agglomerated particle size than milled powder. Cr addition seemed to increase the non-linear coefficient. Cu and Mn rendered dense ceramics, but α values for systems with Mn were higher than for systems with Cu.

Estudo do processo de aglomeração de pectina em leito fluidizado : efeito sobre as propriedades físico-químicas; Study of the pectin agglomeration process : effect on physicochemical properties

Talita Akemi Medeiros Hirata
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 24/03/2011 PT
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Com o aumento da variedade de produtos em pó, produzidos por diversas indústrias alimentícias, há a necessidade de informações detalhadas a respeito do seu manuseio e processamento voltadas para a aplicação em diversos produtos alimentares. O aumento do tamanho de partículas finas pelo processo de aglomeração em leito fluidizado proporciona benefícios que incluem redução de perdas de finos e perigo ou desconforto na manipulação, e principalmente, melhoria das propriedades de instantaneização do pó, por exemplo, solubilidade, dispersão em líquidos etc. Os leitos fluidizados pulsados possuem uma série de vantagens em relação aos leitos convencionais, podendo-se destacar a fácil fluidização de partículas irregulares com tamanhos distintos. A pectina é muito conhecida como agente geleificante e vem sendo utilizada na forma de pó. Este trabalho teve como objetivo estudar as modificações nas propriedades físicas da pectina em pó produzida por aglomeração em leito fluidizado pulsado. As condições ótimas de processo foram obtidas por meio de planejamento experimental, ou delineamento composto central 24. As variáveis estudadas foram temperatura do ar, vazão de ligante, velocidade de fluidização do ar e frequência de pulsação do ar. Obteve-se um rendimento no processo superior a 80% e o aumento de tamanho da partícula foi de quase 340%. O produto foi caracterizado por análises de umidade...

Obtenção de micropartículas lipídicas contendo bicarbonato de sódio por spray cooling e de bicarbonato de sódio aglomerado por melt agglomeration em leito vibrofluidizado; The obtaining of lipid microparticles containing sodium bicarbonate by spray cooling and the obtaining of sodium bicarbonate agglomerated by melt agglomeration in vibrofluidized bed

Emmanuelle Pilarski
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 28/02/2012 PT
Relevância na Pesquisa
36.6%
O presente trabalho teve como objetivo o desenvolvimento de (i) micropartículas lipídicas contendo bicarbonato de sódio pelo processo de spray cooling e de (ii) aglomerados de bicarbonato de sódio, utilizando-se do processo de melt agglomeration em leito vibrofluidizado. Essas tecnologias foram aplicadas com o intuito de melhorar a estabilidade desse material, uma vez que o mesmo se decompõe na presença de umidade/ou temperaturas mais elevadas. Uma mistura lipídica composta por gordura de palma totalmente hidrogenada (GPTH) e óleo de palma refinado (OP) foi empregada como material de parede/ligante que atendeu ao requisito de ponto de fusão de 55 ºC, com a proporção de 57,5 e 42,5 %, respectivamente. No processo de spray cooling, foi realizado um Delineamento Composto Central Rotacional (DCCR), com 11 ensaios, para cada um dos três diâmetros de abertura de bico atomizador estudados (??igual a 1,0; 1,2 e 1,5 mm), totalizando 33 experimentos, a fim de se avaliar o efeito da temperatura de entrada da dispersão (Te) (65 a 85 ºC) e da pressão de atomização (Pat) (1,0 a 2,0 kgf/cm2) sobre as seguintes variáveis dependentes: (i) eficiência de microencapsulação (EM, % de CO2), (ii), quantidade de bicarbonato de sódio superficial (BSS...

Estudo do processo de aglomeração com vapor e perda de qualidade por caking de achocolatados em pó; Study of the steam agglomeration process and loss of quality of cocoa beverage powder by caking

Fernanda Zaratini Vissotto
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 14/02/2014 PT
Relevância na Pesquisa
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Os achocolatados em pó são formulados com a mistura de cacau, açúcar, maltodextrina e aromas, podendo conter derivados lácteos. Para se obter uma adequada reconstituição em líquidos, os achocolatados são submetidos aos processos de lecitinação (adição de um agente tensoativo: lecitina de soja) e aglomeração com vapor. Um dos objetivos desse estudo foi o de avaliar os efeitos das variáveis do processo de aglomeração com vapor (pressão do vapor, temperatura do secador rotativo, vazão de sólidos da alimentação e frequência de rotação do secador) sobre as características físicas e físico-químicas de achocolatados em pó. A aglomeração com vapor levou a um aumento do diâmetro médio de partículas, sendo mais pronunciado no produto formulado com o açúcar moído. O processo foi responsável pelo escurecimento e redução da umidade dos achocolatados, além da diminuição dos tempos de molhabilidade. Adicionalmente foi caracterizada a morfologia dos grânulos de achocolatado, obtidos em diferentes condições operacionais do aglomerador (máxima, média e mínima), utilizando os descritores de tamanho e forma. Os resultados mostraram que não existe diferença entre os descritores de forma e quanto aos descritores de tamanho verificou-se diferença entre as condições de processo para grânulos maiores que 600 ?m. Concluiu-se que os grânulos de achocolatado aglomerados apresentaram formato alongado. Foram também determinadas as transições de fase e as temperaturas de transição vítrea (Tg) de achocolatados em pó e dos seus principais constituintes. Durante a aglomeração com vapor a alta temperatura levou o açúcar moído a uma condição acima da sua Tg...

Enhanced dissolution rate of felodipine using spherical agglomeration with Inutec SP1 by quasi emulsion solvent diffusion method

Tapas, A.R.; Kawtikwar, P.S.; Sakarkar, D.M.
Fonte: Medknow Publications Publicador: Medknow Publications
Tipo: Artigo de Revista Científica
Publicado em //2009 EN
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Felodipine is a second generation calcium channel blocker widely used as antihypertensive and antianginal drug which belongs to BCS class II category. Hence, its low water solubility limits the pharmacological effect. The aim of this study was to improve the dissolution rate of felodipine using spherical agglomeration technique with acetone, water and dichloromethane as good solvent, poor solvent and bridging liquid, respectively. The quasi emulsion solvent diffusion technique was used as a method for spherical agglomeration. Inutec SP1 was used as an emulsion stabilizer and as hydrophilic polymer in agglomeration process. The FTIR and DSC results showed no change in the drug after crystallization process. PXRD studies showed sharp peaks in the diffractograms of spherical agglomerates with minor reduction in height of the peaks. The particle size of spherical agglomerates (FI-2) was about 134.33 ± 13.57 µm, n=3 and the dissolution efficiency of felodipine up to 120 min increased to about 4-fold in phosphate buffer containing 1.8% Tween 80 (pH 6.8). Spherical agglomerates showed enhanced solubility compared to untreated powder possibly due to the partial conversion to amorphous form.

Effect of Pt on agglomeration and Ge out-diffusion in Ni(Pt) germanosilicide

Jin, Lijuan; Pey, Kin Leong; Choi, Wee Kiong; Fitzgerald, Eugene A.; Antoniadis, Dimitri A.; Chi, D.Z.
Fonte: MIT - Massachusetts Institute of Technology Publicador: MIT - Massachusetts Institute of Technology
Tipo: Artigo de Revista Científica Formato: 1019837 bytes; application/pdf
EN_US
Relevância na Pesquisa
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The effect of Ni and Ni(Pt) alloy with ~5 and 10 at. % Pt on the agglomeration and Ge out-diffusion in Nickel germanosilicide formed on Si₀.₇₅Ge₀.₂₅(100) has been studied. A remarkable improvement in the agglomeration behavior with increasing Pt atomic percentage is observed by sheet resistance measurements and scanning electron microscopy (SEM). In addition, x-ray diffraction (XRD) shows that only NiSiGe or Ni(Pt)SiGe phase exists from 400 to 800°C. However, Ge out-diffusion from the monogermanosilicide grains is obvious at 600°C and 700°C for Ni/SiGe and Ni(Pt)(Pt at.%~10%)/SiGe, respectively, evident by XRD and micro-Raman spectroscopy. The improved melting temperature of Ni(Pt)SiGe solution compared to that of NiSiGe is the likely reason of seeing better surface morphology and suppressing Ge out-diffusion of the germanosilicide grains observed.; Singapore-MIT Alliance (SMA)

Mind the Neighbors : The Impact of Productivity and Location on Firm Turnover

Hallward-Driemeier, Mary; Thompson, Fraser
Fonte: Banco Mundial Publicador: Banco Mundial
Relevância na Pesquisa
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This paper examines the impact of firm productivity and local industrial structure on firm entry and exit in Morocco between 1985 and 2001. There is strong evidence of productivity exerting a market-cleansing role. Less productive firms are found to be more likely to exit - and locations with more productive firms attract higher rates of new firm entry. The effect of productivity operates not only in an absolute sense; a firm s relative productivity or distance to the local sector frontier matters too. First, large productivity gaps are associated with higher rates of exit, while new firms are attracted to locations with small productivity gaps. Second, local competition increases the probability of exit, although it does not encourage entry. Third, there is evidence of scale or agglomeration effects that increase firm turnover. Fourth, measures of sector diversity are not associated with lower turnover. Fifth, the geographic level at which agglomeration and competition effects are defined matters differently for exit than entry. For exit...

The Persistence of (Subnational) Fortune : Geography, Agglomeration, and Institutions in the New World

Maloney, William F.; Caicedo, Felipe Valencia
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
EN_US
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Using subnational historical data, this paper establishes the within country persistence of economic activity in the New World over the last half millennium. The paper constructs a data set incorporating measures of pre-colonial population density, new measures of present regional per capita income and population, and a comprehensive set of locational fundamentals. These fundamentals are shown to have explanatory power: native populations throughout the hemisphere were found in more livable and productive places. It is then shown that high pre-colonial density areas tend to be dense today: population agglomerations persist. The data and historical evidence suggest this is due partly to locational fundamentals, but also to classic agglomeration effects: colonialists established settlements near existing native populations for reasons of labor, trade, knowledge and defense. Further, high density (historically prosperous) areas also tend to have higher incomes today, and largely due to agglomeration effects: fortune persists for the United States and most of Latin America. Finally extractive institutions...

Firms’ Locational Choice and Infrastructure Development in Tanzania

Iimi, Atsushi; Humphreys, Richard Martin; Melibaeva, Sevara
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Trabalho em Andamento
EN_US
Relevância na Pesquisa
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Agglomeration economies are among the most important factors in increasing firm productivity. However, there is little evidence supportive of this in Africa. Using the firm registry database in Tanzania, this paper examines a new application of the logit approach with two empirical issues taken into account: spatial autocorrelation and endogeneity of infrastructure placement. The paper finds significant agglomeration economies. It is also found that firms are more likely to be located where local connectivity and access to markets are good. The paper finds that dealing with infrastructure endogeneity and spatial autocorrelation in the empirical model is important. According to the exogeneity test, infrastructure variables are likely endogenous. The spatial autoregressive term is significant. As expected, therefore, there are positive externalities of firm location choice around the neighboring areas.

Agglomeration and defluidisation behaviour of high-sodium, high-sulphur South Australian lignite under fluidised bed gasification conditions.

McCullough, Daniel Peter
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2007
Relevância na Pesquisa
26.38%
The accumulation in the atmosphere of man-made gaseous emissions, including CO2, CH4, and N2O, are seen as a major contributor to climate change via global warming. Electricity generation is a major contributor to the production of these ‘Greenhouse Gases’ in Australia, mainly due to the reliance of the electricity industry on coal combustion. Vast reserves of lignite in South Eastern Australia ensure that coal will continue to be an important fuel for base load power generation for many years to come. Fluidised bed gasification is a process that has the potential to significantly reduce gaseous emissions from coal-based power generation. However, the ash-related problems of agglomeration and defluidisation may prevent the widespread commercialisation of such technology unless a control methodology for these problems can be developed. An experimental program was developed for the current study to test the impact of agglomeration and defluidisation in a 77 mm spouted bed gasification reactor, utilising high-sodium, high-sulphur content lignite. Lignite from the Lochiel deposit in South Australia was used as the test coal. Gasification tests of 4 hour duration each were performed over a wide range of different operating parameters...

Vertical industry relations, spillovers and productivity: Evidence from Chilean plants

Lopez, Ricardo; Suedekum, Jens
Fonte: Center for Applied Economics and Policy Research Publicador: Center for Applied Economics and Policy Research
Tipo: Trabalho em Andamento Formato: 175253 bytes; application/pdf
EN_US
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We use disaggregated data on Chilean plants, and the Chilean input-output table to examine the impact of agglomeration spillovers on total factor productivity (TFP). In common with previous studies, we find evidence of intra-industry spillovers, but no evidence of cross-industry spillovers in general. This picture changes, however, when we take vertical industry relations into account. We find important productivity spillover effects from plants in upstream industries. Interestingly, a similar effect cannot be found from plants in downstream industries. The number of plants in these sectors has no effect on firm level TFP, just as the number of plants in other industries that are neither important upstream suppliers nor downstream customers also has no effect. Agglomeration effects are stronger for small than for large plants.

A recente produção imobiliária no aglomerado metropolitano Paiçandu-Maringá-Sarandi: novos arranjos, velha lógica; The recent housing production in the metropolitan agglomeration Paiçandu - Maringá- Sarandi : new arrangements , old logic

Silva, Beatriz Fleury e
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 08/05/2015 PT
Relevância na Pesquisa
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Esta tese se propõe a analisar a produção imobiliária no Brasil e seus efeitos sobre o espaço urbano e metropolitano, a partir das recentes dinâmicas imobiliárias verificadas na segunda metade da década de 2000 no aglomerado metropolitano de Paiçandu, Maringá e Sarandi, localizado no norte do Paraná. Fazendo parte de um amplo projeto de colonização privada realizada na década de 1940, pela Companhia Melhoramentos Norte do Paraná (CMNP), este aglomerado metropolitano irá assistir desde sua gênese, ao protagonismo do capital imobiliário local sobre a configuração socioespacial do território. Paiçandu, Maringá e Sarandi fazem parte da Região Metropolitana de Maringá formada por 26 municípios cujo polo é Maringá, que historicamente tem apresentado índices socioeconômicos muito superiores às demais cidades que compõe sua região, fazendo da desigualdade regional o traço mais marcante e da segregação socioespacial o processo mais presente entre os três municípios que compõe o aglomerado. Tomou-se como principais aportes teórico-metodológicos o debate sobre a produção capitalista em terras brasileiras, bem como o modelo "máquina de crescimento" exposto por Logan e Molotch em 1987, este adotado como pressuposto dos arranjos de poder no território de estudo. Entrevistas a diferentes agentes imobiliários e agentes públicos dos três municípios...

Effect of mixing time on the bed density, and microstructure of selective laser sintered (sls) aluminium powders

Olakanmi,Eyitayo Olatunde
Fonte: ABM, ABC, ABPol Publicador: ABM, ABC, ABPol
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2012 EN
Relevância na Pesquisa
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The effect of mixing time on the homogeneity of aluminium powder blends and its SLS processed density and microstructure has been explored with a view to providing a basis for quality control. The degree of mixing of the powder particles was quantified in terms of the standard deviation of the bed density of the blended powder. The accuracy of the degree of mixing of aluminium powder's blends obtained at the optimum blending time of 10 minutes is determined by the powder properties and this significantly influenced the powder's bed density. By increasing the mixing time above 10 minutes, particulate agglomeration which inhibit good packing of powdered particles occurs, thus, sintered density decreases and porosity increases. Therefore, high porosity in the powder bed hinders effective thermal conductivity between aluminium particles, thereby, leading to deterioration of the sintered density and microstructure of the SLS processed samples.

Probing dispersion and re-agglomeration phenomena upon melt-mixing of polymer-functionalized graphite nanoplates

Santos, R. M.; Vilaverde, C.; Cunha, E.; Paiva, M. C.; Covas, J. A.
Fonte: Royal Society of Chemistry Publicador: Royal Society of Chemistry
Tipo: Artigo de Revista Científica
Publicado em 25/09/2015 ENG
Relevância na Pesquisa
36.29%
A one-step melt-mixing method is proposed to study dispersion and re-agglomeration phenomena of the as-received and functionalized graphite nanoplates in polypropylene melts. Graphite nanoplates were chemically modified via 1,3-dipolar cycloaddition of an azomethine ylide and then grafted with polypropylene-graft-maleic anhydride. The effect of surface functionalization on the dispersion kinetics, nanoparticle re-agglomeration and interface bonding with the polymer is investigated. Nanocomposites with 2 or 10 wt% of as-received and functionalized graphite nanoplates were prepared in a small-scale prototype mixer coupled to a capillary rheometer. Samples were collected along the flow axis and characterized by optical microscopy, scanning electron microscopy and electrical conductivity measurements. The as-received graphite nanoplates tend to re-agglomerate upon stress relaxation of the polymer melt. The covalent attachment of a polymer to the nanoparticle surface enhances the stability of dispersion, delaying the re-agglomeration. Surface modification also improves interfacial interactions and the resulting composites presented improved electrical conductivity.; Project Matepro – Optimizing Materials and Processes, with reference NORTE-07- 0124-FEDER-000037 by the Programa Operacional Regional do Norte (ON.2); Portuguese Foundation for the Science and Technology (FCT) for PEst-C/CTM/LA0025/2013

Effect of grain shape on the agglomeration of polycrystalline thin films

Bouville, Mathieu
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 03/10/2006
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Grain-boundary grooving is a general phenomenon occurring in all polycrystalline materials at the intersection between the grain-boundary and the interface or free surface. It has been studied theoretically for some time. Grain-boundary grooving in the context of faceted interfaces in particular has attracted some attention. However, these works did not consider the case of thin films and the consequences on agglomeration of the shape of the interface. In this Letter, we compare the agglomeration of thin films with rounded and faceted interfaces. The shape of the grains can dramatically affect the agglomeration of polycrystalline thin films by grain-boundary grooving. Anisotropy plays a central role in the stability against agglomeration of faceted films. Even a small difference between the interface energies of the facets can destabilize faceted grains or, on the contrary, it can make them perfectly stable at any thickness. keywords: grain-boundary grooving, dihedral angle, faceting, energy, silicide, theory, model.; Comment: 3 pages, 3 figures

Agglomeration economies and labour productivity: evidence from longitudinal worker data for GB's travel-to-work areas

Graham, Daniel J.; Melo, Patricia C.
Fonte: Spatial Economics Research Centre (SERC), London School of Economics and Political Science Publicador: Spatial Economics Research Centre (SERC), London School of Economics and Political Science
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /10/2009 EN; EN
Relevância na Pesquisa
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This paper analyzes the impact of agglomeration externalities on hourly earnings using longitudinal worker micro-level data from the Annual Survey of Hours and Earnings over the period 2002- 2006. We find that the effect of agglomeration externalities on wages is sensitive to the estimator used. Controlling for nonzero correlation between workers’ unobservable skills and other covariates halves the size of the wage elasticity of agglomeration externalities. On the contrary, accounting for firms’ unobservable heterogeneity has only a weak contribution to the explanation of wage differentials. Another interesting result is that correcting for reverse causality between productivity and agglomeration does not appear to have a substantial impact on the magnitude of the parameter estimates. Our best estimate for the effect of labour market density (market potential) is 0.8% (5.8%). This means that doubling labour market’s employment density can raise hourly earnings by nearly 1%, while halving the distances to other markets produces an increase of hourly wages of nearly 3%. The last piece of evidence refers to the spatial attenuation of agglomeration externalities. We estimate that a 100,000 increase in the number of jobs within 5 kilometres raises hourly wages by approximately 1.19%; the effect falls sharply thereafter.

Agglomeration elasticities and firm heterogeneity

Graham, Daniel J.; Maré, David C.
Fonte: Spatial Economics Research Centre (SERC), London School of Economics and Political Science Publicador: Spatial Economics Research Centre (SERC), London School of Economics and Political Science
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /02/2010 EN; EN
Relevância na Pesquisa
26.36%
This paper estimates the relationship between agglomeration and multi factor productivity at the one digit industry level and by region using longitudinal firm level data for New Zealand. A key focus of the paper is on methods to represent firm level heterogeneity and non-random sorting of firms. The panel structure of the data allows us to control for it at the level of local industries or enterprises. We obtain a cross-sectional agglomeration elasticity of 0.171, which falls by 70% when we use local industry controls, and by 90% when we impose enterprise fixed effects. Using industry specific production functions, we find that the “within local industry” estimates are similar, though slightly larger than the cross sectional estimates (~0.070), suggesting negative sorting between areas, combined with positive sorting within areas. The within-enterprise estimates yield a small elasticity of 0.010. Our results indicate that the imposition of a common production technology across all industries is not a valid assumption. While cross-sectional estimates may overstate the true impact of agglomeration on productivity in the presence of positive bias from sorting, the within enterprise approach (which is increasingly common in the literature) can suffer from identification problems due to the highly persistent nature of agglomeration variables and may understate the true causal effect of agglomeration on productivity. We thus rely on the “within local industry” estimates as providing the most reliable indication of agglomeration elasticities.

Is the sky the limit? an analysis of high-rise office buildings

Koster, Hans R.A.; Rietveld, Piet; van Ommerren, Jos N.
Fonte: Spatial Economics Research Centre (SERC), London School of Economics and Political Science Publicador: Spatial Economics Research Centre (SERC), London School of Economics and Political Science
Tipo: Monograph; NonPeerReviewed Formato: application/pdf
Publicado em /07/2011 EN; EN
Relevância na Pesquisa
26.3%
Modern central business districts are characterised by high-rise office buildings. Helsley and Strange (2008) argue that skyscrapers are caused by agglomeration economies and a prize for being the tallest, so a reputation effect. We aim to test the relevance of this model by investigating the impact of building height on commercial office rents. The results show that firms are willing to pay about 4 percent more for a building that is 10 meters taller, which we interpret as the sum of a within-building agglomeration effect and a reputation effect. Using semiparametric techniques, we disentangle reputation effects from agglomeration effects and demonstrate that the reputation effect is substantial for tall buildings. For example, it is at least 17.5 percent of the rent for a building that is 6 times the average height.

Essays on agglomeration, trade costs and foreign direct investment

Chen, Chinchih
Fonte: London School of Economics and Political Science Thesis Publicador: London School of Economics and Political Science Thesis
Tipo: Thesis; NonPeerReviewed Formato: application/pdf
Publicado em /02/2014 EN
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This thesis is composed of three chapters. The first one investigates the impact of distance, market and supply access and agglomeration externalities on FDI locations. Chapter 2 studies the change in trade costs on FDI locations. Chapter 3 examines the relative effect of trade costs on horizontal and vertical FDI locations. Chapter 1 provides empirical evidence of the effect of agglomeration with firms from the same country on other location determinants. I use data for the Taiwanese FDI projects in Chinese provinces from 1991 to 1996. In order to estimate the relative change in coefficient magnitude over time, I exploit Taiwan’s FDI policy shock in 1991. I find negative effects of the bilateral distance between the home and host country on FDI locations. Sectoral agglomeration with firms from the same country also has significant and positive impact on FDI locations. Chapter 2 investigates the impact of the change in trade costs on FDI locations. I study the effect on the FDI growth rate and the number of new FDI projects. Taiwan’s cross-strait direct flights policy in 2008 provides a quasi/natural experiment on the change in trade costs, arising from the implementation of direct flights between Taiwan and China. I use difference-in-difference estimator with Taiwanese firm-level data for the period 2002 to 2011 to identify the casual effect of the change in trade costs on FDI locations. Furthermore...