Results 31 to 40 of about 241,664 (350)

The unpredictably eruptive dynamics of spruce budworm populations in eastern Canada

Population Ecology, EarlyView.
We examine historical population data for spruce budworm from several locations through the period 1930–1997, and use density‐dependent recruitment curves to test whether the pattern of population growth over time is more consistent with Royama's (1984; Ecological Monographs 54:429–462) linear R(t) model of harmonic oscillation at Green River New ...
Barry J. Cooke, Jacques Régnière
wiley   +1 more source

Application of real options valuation in nuclear energy systems [PDF]

International Journal of Research in Industrial Engineering
In recent years, there has been a very increasing trend in energy consumption worldwide, especially in the electricity sector, which, due to global sensitivities to protecting the environment and reducing greenhouse gas emissions, leads to the use of ...
Abdollah Arasteh
doaj   +1 more source

Uncertainty and Human Capital Decisions: Traditional Valuation Methods and Real Options Logic [PDF]

, 2007
As the importance of human capital increases in organizations, so does the need to develop more sophisticated financial valuation models. This paper reviews some of the major traditional financial decision making models used in costing employment mode ...
Badders, Brett, Clark, Lindsey Cottom, Wright, Patrick M   +2 more
core   +1 more source

Network topology drives population temporal variability in experimental habitat networks

Population Ecology, EarlyView.
Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu, J. Angus Webb, William D. Bovill, Elise L. King   +3 more
wiley   +1 more source

Geographic variation in walking activity in the red flour beetle Tribolium castaneum

Population Ecology, EarlyView.
This study examined whether there is geographic variation in field populations, focusing on the moving activity in the red flour beetle Tribolium castaneum. Results showed significant differences in moving activity among field populations but no correlation with latitude or meteorological factors.
Kentarou Matsumura
wiley   +1 more source

Callable Asian Option Valuation

, 2023
We present a new model named callable Asian options. Such options allow their underwriters to call the options back from investors at a specified time and with a specified amount prior to option maturities. A hybrid of Monte Carlo simulation and the closed form Michael Curran’s solution is employed in pricing.
openaire   +2 more sources

occumb: An R package for site occupancy modeling of eDNA metabarcoding data

Population Ecology, EarlyView.
This study introduces a new R package, occumb, for the convenient application of site occupancy modeling using environmental DNA (eDNA) metabarcoding data. We outline a data analysis workflow, including data setup, model fitting, model assessment, and comparison of potential study settings based on model predictions, all of which can be performed using
Keiichi Fukaya, Yuta Hasebe
wiley   +1 more source

Between Droughts and Floods: The Seasonal Response of Freshwater Snails in Artificial Reservoirs in the Brazilian Semiarid Region

Population Ecology, EarlyView.
We investigate the seasonal dynamics of two freshwater snails, Biomphalaria straminea and Melanoides tuberculata, in artificial reservoirs of the Brazilian semiarid region. Despite regulated hydrology, B. straminea exhibited strong seasonal fluctuations associated with dry periods, while M. tuberculata maintained stable populations throughout the year,
Lucas Henrique Sousa da Silva, João Hemerson de Sousa, Adriana Josefa da Rocha, Manuella Feitosa Leal, Lucas Ariel de Sousa Aguiar, Tamaris Gimenez Pinheiro, Edson Lourenço da Silva   +6 more
wiley   +1 more source

Real Options Application in Valuing “South Pars Gas Field” Development Project [PDF]

Pizhūhishnāmah-i Iqtiṣād-i Inirzhī-i Īrān, 2014
In this paper we provide an introduction to real options in valuing investment projects. Since one of the real options applications is valuing oil and gas development projects with high uncertainty and considerable investment costs, in this research we ...
mansoor khalili araghi, akbar kamijani, zeinab kasraee   +2 more
doaj  

A Quasi-Closed-Form Solution for the Valuation of American Put Options

International Journal of Financial Studies, 2020
This study develops a quasi-closed-form solution for the valuation of an American put option and the critical price of the underlying asset. This is an important area of research both because of a large number of transactions for American put options on ...
Cristina Viegas, José Azevedo-Pereira
doaj   +1 more source