The role of sediment specific gravity and availability on cluster evolution

2003 ◽  
Vol 28 (1) ◽  
pp. 69-86 ◽  
Author(s):  
A. N. Papanicolaou ◽  
K. Strom ◽  
A. Schuyler ◽  
N. Talebbeydokhti
Keyword(s):  
Specific Gravity ◽  
Cluster Evolution

Forging connections: The role of ‘boundary spanners’ in globalising clusters and shaping cluster evolution

2021 ◽  
pp. 030913252110387
Author(s):  
Di Wu
Keyword(s):  
Boundary Spanning ◽  
Discursive Construction ◽  
Boundary Spanners ◽  
Production Networks ◽  
Global Production Networks ◽  
Boundary Spanner ◽  
Evolutionary Economic ◽  
Cluster Evolution ◽  
Global Connections

Synthesising the endogenous-centred evolutionary economic geography perspective, and the globally oriented ‘global pipelines’ and global production networks frameworks, this article develops the ‘boundary spanner’ concept to propose a theoretical framework to illustrate how resourceful actors, as boundary spanners, globalise clusters and in turn drive cluster evolution. This framework comprises four interrelated cluster boundary-spanning functions, namely, discursive construction, innovation promotion, production coordination and market reach. This article aims to advance the cluster literature by unpacking how clusters’ global connections are constructed and maintained, conceptualising the multidimensional role of the agency of boundary spanners and demonstrating boundary spanners’ contributions to cluster evolution.

The role of ballast specific gravity and velocity gradient in ballasted flocculation

2020 ◽  
Vol 399 ◽  
pp. 122970 ◽  
Author(s):  
Muhammad Qasim ◽  
Seongjun Park ◽  
Jong-Oh Kim
Keyword(s):  
Specific Gravity ◽  
Velocity Gradient

Role of catecholamine release in morphine hyperglycemia

1961 ◽  
Vol 200 (3) ◽  
pp. 530-534 ◽  
Author(s):  
Mario Vassalle
Keyword(s):  
Specific Gravity ◽  
Blood Sugar ◽  
Adrenal Medulla ◽  
Catecholamine Release ◽  
Blocking Agents ◽  
Morphine Administration ◽  
Adrenergic Blocking ◽  
Adrenergic Blocking Agents

The mechanism of morphine hyperglycemia was studied in intact and chronically adrenalectomized dogs. Adrenergic blocking agents were used to provide a further analysis of the hyperglycemic action of morphine. Venous hematocrit and plasma specific gravity were measured on the assumption that catecholamines released by morphine could elicit a contraction of the spleen. Morphine administration caused a rise in both sugar and hematocrit; after adrenalectomy, blood sugar and hematocrit showed a much smaller increase. Morphine hyperglycemia was antagonized by dihydroergotamine and dichloroisoproterenol but not by Dibenamine. Since this is the pattern of epinephrine hyperglycemia it was concluded that morphine hyperglycemia is mediated by the release of catecholamines, mainly from the adrenal medulla. Atropine and Artane failed to counteract morphine hyperglycemia. Thus these experiments, as far as the blood sugar is concerned, do not favor the hypothesis that morphine acts through an anticholinesterase mechanism.

An analysis of the movements of shadow-edges on the refractometer in the case of biaxial gemstones

1942 ◽  
Vol 26 (178) ◽  
pp. 246-253
Author(s):  
E. J. Burbage ◽  
B. W. Anderson
Keyword(s):  
Specific Gravity ◽  
Absorption Spectra ◽  
Crystal Form ◽  
Chemical Reagents ◽  
Similar Appearance ◽  
Optical Phenomena ◽  
Commercial Value ◽  
Field Of Inquiry

The study and identification of the gem minerals present difficulties which are not to be resolved by the ordinary methods of mineralogy. The commercial value of the material forbids recourse to chemical reagents and the blowpipe, and when faceted and mounted, the criteria of crystal form and specific gravity are also inapplicable. Optical phenomena then constitute the sole means of discrimination, and the refractometer, spectroscope, polariscope, and dichroscope become the only arbiters between gemstones of similar appearance but different species. The function of the polariscope is to narrow the field of inquiry by differentiating between isotropic and anisotropic gemstones; the verdict of the spectroscope is unequivocal in gemstones characterized by absorption spectra, which, unfortunately, form a minority ; dichroism, when present, can be regarded as supplementary evidence only; the refractometer, an instrument of wider application than the spectroscope, and capable of yielding information which is usually equally unambiguous, thus assumes a role of primary importance.

Sign in / Sign up

Export Citation Format

Share Document