A Global Ionospheric TEC Perturbation Index

2009 ◽  
Vol 52 (5) ◽  
pp. 907-912 ◽  
Author(s):  
You YU ◽  
Wei-Xing WAN ◽  
Li-Bo LIU ◽  
Bi-Qiang ZHAO
Keyword(s):  
Perturbation Index

Engineering Innovative Practice in Managing Design Projects

2012 ◽  
Vol 4 (3) ◽  
pp. 13-23
Author(s):  
Fernando Abreu Gonçalves ◽  
José Figueiredo
Keyword(s):  
Engineering Design ◽  
Network Theory ◽  
Actor Network Theory ◽  
Value Management ◽  
Change Processes ◽  
Earned Value ◽  
Earned Value Management ◽  
Design Projects ◽  
Scope Management ◽  
Perturbation Index

Most references to innovation relate to the development of new products. This paper does not address innovation in these terms, but as changes in practices an engineer creatively adopts during engineering design projects. The authors adopt Actor-Network Theory as a way to understand these change processes (translations). The authors design a perturbation index inspired in Earned Value management to measure translation effort having in mind the management of scope. The paper then assesses changes of regime in resource allocation of tasks and concludes some changes that can lead to innovative results. That means a wider view about scope, and scope management is gained, being able to observe and change good practices, something crucial in engineering design projects where requirements and goals drift.

Resilience of forested wetlands located in the southeastern United States: Demonstration of a soil perturbation index

Wetlands ◽  
1999 ◽  
Vol 19 (1) ◽  
pp. 288-295 ◽  
Author(s):  
Rebecca Smith Maul ◽  
Marjorie M. Holland ◽  
Alfred T. Mikell ◽  
Charles M. Cooper
Keyword(s):  
United States ◽  
Southeastern United States ◽  
Forested Wetlands ◽  
Perturbation Index

scholarly journals The perturbation index of linear PDAEs with a hyperbolic part

PAMM ◽  
2005 ◽  
Vol 5 (1) ◽  
pp. 815-816
Author(s):  
Joachim Rang ◽  
Lutz Angermann
Keyword(s):  
Perturbation Index

scholarly journals Refinement of the geomagnetic perturbation index by processing orbit measurements of a test satellite

2018 ◽  
pp. 1-43
Author(s):  
Sergei Nikolaevich Alyamovski ◽  
Mikhail Yuryevich Belyaev ◽  
Dmitrii Nikolaevich Rulev ◽  
Victor Vasil’yevich Sazonov
Keyword(s):  
Perturbation Index

scholarly journals Evaluation De La Dégradation De La Chamaeropaie Du Versant Sud Du Mont « jbelLakraa » (Maroc) Etudes Floristique Et Morphométrique

2018 ◽  
Vol 14 (14) ◽  
pp. 76 ◽  
Author(s):  
Khalid Benarchid ◽  
Mohammed Khatori ◽  
Said Hilali
Keyword(s):  
Vascular Plants ◽  
Floristic Composition ◽  
Morphometric Study ◽  
Southern Slope ◽  
Floristic Study ◽  
Number Of Leaves ◽  
Middle Atlas ◽  
Very High ◽  
Perturbation Index ◽  
Degradation State

Our study is devoted to the chamaeropaie degradation assessment of the jbel Lakraa southern slope, located in the northern Middle Atlas in the Ribat Al Khair region. The floristic study revealed a specific richness of 124 species belonging to 95 genera and 33 vascular plants families, as well as a specific diversity relatively high with a Shannon-Weaver index of 3.88. A relatively high specific diversity with a Shannon-Weaver index of 3.88 was observed. However, the floristic composition showed a disturbance expressed by the index of equitability which is 0.58 and a strong therophytisation of 63% with a very high perturbation index of 69%. This disturbance is also illustrated by the toxic or spiny species proliferation such as Asphodelus ramosus, Drimia maritima and Scolymus hispanicus. The morphometric study was carried out on two strata (stratum 1 anthropized - stratum 2 wooded). The Statistical analysis showed that the diameter and height of the foliage, as well as the number of leaves per individual of the tree stratum are significantly higher than those of the anthropized stratum. Furthermore, an absence of correlations between the morphometric variables was recorded in the anthropized stratum. The chamaeropaie degradation state is alarming as indicated by the floristic and morphometric results, urgent measures must be taken to regulate its exploitation and preservation.

Innovating Practices in Managing Engineering Design Projects

2014 ◽  
pp. 81-95
Author(s):  
Fernando Abreu Gonçalves ◽  
José Figueiredo
Keyword(s):  
Engineering Design ◽  
Change Processes ◽  
Actor Network ◽  
Design Projects ◽  
Scope Management ◽  
Engineering Practices ◽  
The Cost ◽  
Engineering Projects ◽  
Innovation Processes ◽  
Perturbation Index

We can address innovation from different perspectives. In engineering practices we can look to changes resulting from attempts to discover ways of overcoming difficulties. How can we manage these innovative practices in engineering design projects? Furthering our perspective we use an actor-network way to look at change processes as chains of translations between heterogeneous actors that are enrolled in changes and where patterns of action are inscribed in durable manners. In an actor-network, the chains of inscriptions are stronger if the number of aligned actors is bigger, and this is the case of engineering projects where the cost of change builds up with time. Through the use of some stylized situations, the authors construct a Perturbation Index to obtain numeric values to assess the dynamics of innovations in engineering practices. The aim is that the application of this index to real situations could lead to meaningful descriptions of such innovation processes. Managing innovation in engineering design projects has to do with the management of project scope. The proposal extends scope management from its definition and planning phases through the control of changes along the execution.

scholarly journals A METHOD FOR COMPARING EFFECTS OF DIFFERENT SYNCHRONIZING PROTOCOLS ON MAMMALIAN CELL CYCLE TRAVERSE

1972 ◽  
Vol 54 (3) ◽  
pp. 638-645 ◽  
Author(s):  
Robert A. Tobey ◽  
Harry A. Crissman ◽  
Paul M. Kraemer
Keyword(s):  
Cell Cycle ◽  
Chinese Hamster ◽  
Experimental Manipulation ◽  
G1 Arrest ◽  
Genome Replication ◽  
Mammalian Cell Cycle ◽  
Deficient Medium ◽  
Large Populations ◽  
Inhibition Of Dna Synthesis ◽  
Perturbation Index

After treatment of Chinese hamster cells (line CHO) with various protocols for synchrony induction, the subsequent ability of cells to traverse the cell cycle (i e., to perform, an essential cell cycle process) has been determined by measurement of the DNA distribution pattern among cells in large populations with the Los Alamos flow microfluorometer In the cultures prepared by the various synchronizing techniques the vast majority of cells traversed the cell cycle in a normal fashion; however, in all cultures examined there remained small subpopulations which, though remaining viable for several days, could not carry out normal traverse. After reversible inhibition of DNA synthesis by means of a double-thymidine blockade, approximately 17% of the cells were unable to complete genome replication. After reversal of G1 arrest resulting from cultivation of cells in isoleucine-deficient medium, 12 4% of the cells commenced synthesis of DNA but were unable to complete the S phase. Cells prepared by mitotic selection yielded a subpopulation (5 5% of the total cells) with a G1 DNA content which remained viable but noncycling for at least 5 days. We propose a term "traverse perturbation index" which is defined as the fraction of cells converted to a noncycle-traversing state as the result of experimental manipulation. A knowledge of the perturbation index will allow direct comparison of effects on cell cycle traverse of various synchrony-induction protocols

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