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Two population models with constrained migrations
Normand, Raoul - In: Stochastic Processes and their Applications 124 (2014) 5, pp. 1773-1812
We study two models of population with migration. On an island lives an individual whose genealogy is given by a critical Galton–Watson tree. If its offspring ends up consuming all the resources, any newborn child has to migrate to find new resources. In this sense, the migrations are...
Persistent link: https://www.econbiz.de/10010875061
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Validation and analysis of detailed kinetic models for ethylene combustion
Xu, Chaoqi; Konnov, Alexander A. - In: Energy 43 (2012) 1, pp. 19-29
Present work aims at evaluation of contemporary comprehensive detailed kinetic mechanisms for ethylene combustion … validated by extensive comparison with available experimental data on ethylene ignition and flame propagation. The experimental … differences in the predictions of ethylene ignition and flame propagation under a variety of conditions have been observed …
Persistent link: https://www.econbiz.de/10010809695
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Steam cracking and methane to olefins: Energy use, CO2 emissions and production costs
Ren, Tao; Patel, Martin K.; Blok, Kornelis - In: Energy 33 (2008) 5, pp. 817-833
While most olefins (e.g., ethylene and propylene) are currently produced through steam cracking routes, they can also … to low ethylene yields and other problems. While several possibilities for energy efficiency improvement do exist, none …
Persistent link: https://www.econbiz.de/10010810563
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The solution of time-dependent population models
Li, Nan; Tuljapurkar, Shripad - In: Mathematical Population Studies 7 (2000) 4, pp. 311-329
We analyze the dynamics of age-structured population renewal when vital rates make a transition in a finite time interval from arbitrary initial values to any specified final values. The general solution to the renewal equation in such cases is obtained. This solution describes the birth...
Persistent link: https://www.econbiz.de/10009205484
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Modelling regional population growth in China
Shen, Jianfa; Spence, Nigel - In: Mathematical Population Studies 6 (1997) 3, pp. 241-274
This paper develops a forward demographic rates-based multiregional population model on the basis of a set of multiregional population accounts. Forward emigration rates and immigration flows are adopted to describe the external migrations. The model is used to make consistent multiregional...
Persistent link: https://www.econbiz.de/10009205504
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Reject and resubmit : a formal analysis of gender differences in reapplication and their contribution to women's presence in talent pipelines
Fernandez-Mateo, Isabel; Rubineau, Brian; Kuppuswamy, Venkat - In: Organization science 34 (2023) 4, pp. 1554-1576
Persistent link: https://www.econbiz.de/10014321649
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A bioeconomic model of trophy hunting
Naevdal, Eric; Olaussen, Jon Olaf; Skonhoft, Anders - In: Ecological Economics 73 (2012) C, pp. 194-205
During the last few decades wildlife trophy hunting has increasingly replaced traditional meat hunting. The economics of trophy hunting is analyzed with the Scandinavian moose (Alces alces) serving as an example. A four-stage model (calf, yearlings, adult female and adult male) is formulated....
Persistent link: https://www.econbiz.de/10010576674
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Plastic vs. fuel: Which use of the Brazilian ethanol can bring more environmental gains?
Alvarenga, Rodrigo A.F.; Dewulf, Jo - In: Renewable Energy 59 (2013) C, pp. 49-52
hydrous ethanol as fuel for transportation and the same amount for monomer production (ethylene), and compared them with the … common practice of today in Brazil. Using ethanol to produce ethylene (instead of fossil-based ethylene) would generate … and 1.82 kg CO2eq. Some uncertainties were quantified, for instance we could observe that when the ethanol-to-ethylene …
Persistent link: https://www.econbiz.de/10011045756
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Exergetic analysis of the refrigeration system in ethylene and propylene production process
Fábrega, F.M.; Rossi, J.S.; d'Angelo, J.V.H. - In: Energy 35 (2010) 3, pp. 1224-1231
refrigeration cycles in ethylene and propylene production process, calculating the loss of exergy, in order to propose changes in …
Persistent link: https://www.econbiz.de/10011054932
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Testing the null hypothesis of zero serial correlation in short panel time series: a comparison of tail probabilities
Peiris, Shelton - In: Statistical Papers 55 (2014) 2, pp. 513-523
It is known that the analysis of short panel time series data is very important in many practical problems. This paper calculates the exact moments up to order 4 under the null hypothesis of no serial correlation when there are many independent replications of size 3. We further calculate the...
Persistent link: https://www.econbiz.de/10010998600