نتایج جستجو برای: agglomeration effect

تعداد نتایج: 1646521  

Journal: :journal of paramedical sciences 0
maliheh hasan nia biotechnology research center, semnan university of medical sciences, semnan, iran mostafa rezaei-tavirani proteomics research center, shahid beheshti university of medical sciences, tehran, iran ali reza nikoofar department of radiation oncology, iran university of medical sciences, tehran, iran hamed masoumi department of medical physics, semnan university of medical sciences, semnan, iran reza nasr 1 biotechnology research center, semnan university of medical sciences, semnan, iran hadi hasanzadeh department of medical physics, semnan university of medical sciences, semnan, iran

tio 2 nanoparticles (nps) might be considered as the most important photosensitizer due to high photocatalytic and sonocatalytic efficiency, low toxicity, excellent biocompatibility, low cost and high chemical stability. tio 2 -nps normally tend to aggregate in physiological medium and which results to decreased cell viability and inducing expression of stress-related genes. thus dispersion and...

2008
Ryohei Nakamura

Urban agglomeration economies are usually divided into two categories: urbanization economies and localization economies. In the 1970s and 1980s, a number of attempts were made to estimate urbanization economies and/or localization economies directly in the production function. Since the work by Glaeser et al. in 1992, however, historical effects on agglomeration called dynamic externalities in...

2011
Youngho Kang

Unlike policy makers‟ belief that geographical proximity to incumbent exporters encourages non-exporters to start exporting through positive information externalities, the empirical evidence in early studies is mixed. To make a contribution to fill the gap, this paper reexamines the relationship between the spatial and industrial agglomeration of exporting firms and the probability of being an ...

2001
Geoffrey J. D. Hewings John B. Parr

Following on from the work of Goldstein and Gronberg, it is argued that under certain conditions, internal economies of scope form the bases for two types of agglomeration economy. These differ from two more familiar types, which are based on internal and external economies of scale. A further two types of agglomeration economy are shown to derive from different forms of external economy. The c...

2013
Parul Saini Anoop Kumar Sharad Visht

Present review on the topic explores the different techniques of spherical agglomeration employed in pharmaceutical sciences and their potential applications in developing new particulate systems of drug. Spherical agglomeration is a particle engineering technique which transforms the fine crystals into spherical particles in a single step. These techniques applied in development of new systems...

2011
Shyamal C. Das Srinivas Ravindra Babu Behara David A. V. Morton Ian Larson Peter J. Stewart

Purpose: This study determined total surface energy distributions using an Inverse Gas Chromatography (IGC) to understand the de-agglomeration of fine lactose powders commonly used in dry powder inhaler formulations. Methods: The particle size distribution (PSD) of two lactose samples, Lactohale 300 (Lac A) and micronized lactose (Lac B), were determined by laser diffraction in liquid media, an...

2007
Glenn Ellison Edward L. Glaeser

Many industries are geographically concentrated. Many mechanisms that could account for such agglomeration have been proposed. We note that these theories make different predictions about which pairs of industries should be coagglomerated. We discuss the measurement of coagglomeration and use data from the Census Bureau’s Longitudinal Research Database from 1972 to 1997 to compute pairwise coag...

2010
Richard Hornbeck Enrico Moretti Michael Greenstone Vernon Henderson William Kerr Jeffrey Kling Jonathan Levin Stuart Rosenthal Christopher Rohlfs Chad Syverson

We quantify agglomeration spillovers by estimating the impact of the opening of a large manufacturing plant on the total factor productivity (TFP) of incumbent plants in the same county. We use the location rankings of profit-maximizing firms to compare incumbent plants in the county where the new plant ultimately chose to locate (the “winning county”), with incumbent plants in the runner-up co...

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