A new betweenness centrality measure based on an algorithm for ranking the nodes of a network

We propose and discuss a new centrality index for urban street patterns represented as networks in geographical space. This centrality measure, that we call ranking-betweenness centrality, combines the idea behind the random-walk betweenness centrality measure and the idea of ranking the nodes of a network produced by an adapted PageRank algorithm. We initially use a PageRank algorithm in which we are able to transform some information of the network that we want to analyze into numerical values. Numerical values summarizing the information are associated to each of the nodes by means of a data matrix. After running the adapted PageRank algorithm, a ranking of the nodes is obtained, according to their importance in the network. This classification is the starting point for applying an algorithm based on the random-walk betweenness centrality. A detailed example of a real urban street network is discussed in order to understand the process to evaluate the ranking-betweenness centrality proposed, performing some comparisons with other classical centrality measures.

Isothermal (liquid + liquid) equilibrium data at T = 313.15 K and isobaric (vapor + liquid + liquid) equilibrium data at 101.3 kPa for the ternary system (water + 1-butanol + p-xylene)

The (vapor + liquid), (liquid + liquid) and (vapor + liquid + liquid) equilibria of the ternary system (water + 1-butanol + p-xylene) have been determined. (Water + 1-butanol + p-xylene) is a type 2 heterogeneous ternary system with partially miscible (water + 1-butanol) and (water + p-xylene) pairs. By contrast, (1-butanol + p-xylene) is totally miscible under atmospheric conditions. This paper examines the (vapor + liquid) equilibrium in both heterogeneous and homogeneous regions at 101.3 kPa of pressure. (Liquid + liquid) equilibrium data at T = 313.15 K have also been determined, and for comparison, the obtained experimental data have been calculated by means of several thermodynamic models: UNIQUAC, UNIFAC and NRTL. Some discrepancies were found between the (vapor + liquid + liquid) correlations; however, the models reproduced the (liquid + liquid) equilibrium data well. The obtained data reveal a ternary heterogeneous azeotrope with mole fraction composition: 0.686 water, 0.146 1-butanol and 0.168 p-xylene.

Isobutane Alkylation Process Synthesis by means of Hybrid Simulation-Multiobjective Optimization

Multiobjective Generalized Disjunctive Programming (MO-GDP) optimization has been used for the synthesis of an important industrial process, isobutane alkylation. The two objective functions to be simultaneously optimized are the environmental impact, determined by means of LCA (Life Cycle Assessment), and the economic potential of the process. The main reason for including the minimization of the environmental impact in the optimization process is the widespread environmental concern by the general public. For the resolution of the problem we employed a hybrid simulation- optimization methodology, i.e., the superstructure of the process was developed directly in a chemical process simulator connected to a state of the art optimizer. The model was formulated as a GDP and solved using a logic algorithm that avoids the reformulation as MINLP -Mixed Integer Non Linear Programming-. Our research gave us Pareto curves compounded by three different configurations where the LCA has been assessed by two different parameters: global warming potential and ecoindicator-99.

Seed dispersal characteristics to polar regions by means of visitors

Invasive alien species are among the primary causes of biodiversity change globally, with the risks thereof broadly understood for most regions of the world. They are similarly thought to be among the most significant conservation threats to Antarctica, especially as climate change proceeds in the region. However, no comprehensive, continent-wide evaluation of the risks to Antarctica posed by such species has been undertaken. Here we do so by sampling, identifying, and mapping the vascular plant propagules carried by all categories of visitors to Antarctica during the International Polar Year's first season (2007-2008) and assessing propagule establishment likelihood based on their identity and origins and on spatial variation in Antarctica's climate. For an evaluation of the situation in 2100, we use modeled climates based on the Intergovernmental Panel on Climate Change's Special Report on Emissions Scenarios Scenario A1B [Nakicenovic N, Swart R, eds (2000) Special Report on Emissions Scenarios: A Special Report of Working Group III of the Intergovernmental Panel on Climate Change (Cambridge University Press, Cambridge, UK)]. Visitors carrying seeds average 9.5 seeds per person, although as vectors, scientists carry greater propagule loads than tourists. Annual tourist numbers (~33,054) are higher than those of scientists (~7,085), thus tempering these differences in propagule load. Alien species establishment is currently most likely for the Western Antarctic Peninsula. Recent founder populations of several alien species in this area corroborate these findings. With climate change, risks will grow in the Antarctic Peninsula, Ross Sea, and East Antarctic coastal regions. Our evidence-based assessment demonstrates which parts of Antarctica are at growing risk from alien species that may become invasive and provides the means to mitigate this threat now and into the future as the continent's climate changes.

A 1993 Honda Civic CX into a 50% left offset barrier in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A non-deformable crabbed impactor into a 1990 Honda Civic SI in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A 1987 Ford Taurus into a 30.5 cm diameter pole barrier in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A 1990 Ford Taurus into heavy truck rigid rear underride guard in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A 1992 Chevrolet Caprice into a 30.5 cm diameter pole barrier in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A non-deformable crabbed impactor into a 1988 Ford Taurus 4-door sedan in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A 1988 Ford Taurus into a 50% left offset barrier in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A 1991 Chevrolet Silverado into a 50% left offset barrier in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A 1993 Honda Civic DX into heavy truck rigid rear underride guard in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

A 1987 Ford Escort into a 50% left offset barrier in support of CRASH3 damage algorithm reformulation. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Domestic exchange and rates of collection by Bank U.S.and its branches. Documents submitted by Mr.Polk,from the Committee of ways and means,January 10,1835.

At head of title:23d Congress,2d session. Doc.No.71. Ho.of Reps. Treas.Dept.