[1] Step‐drawdown tests (SDTs) typically involve pumping a well at a constant rate until a quasi‐steady state (QSS) is observed in the drawdown response. The well is then pumped at a higher constant rate until a new QSS is achieved. The process is repeated for additional flow rates. Analysis involves plotting the QSS drawdowns against their corresponding abstraction rates and fitting a nonlinea...

This paper deals with a constrained investment problem for a defined contribution (DC) pension fund where retirees are allowed to defer the purchase of the annuity at some future time after retirement. This problem has already been treated in the unconstrained case in a number of papers. The aim of this work is to deal with the more realistic case when constraints on the investment strategies a...

The first four to five years of a Private Equity (PE) Fund’s life are known as the investment period. In this period, the fund usually draws down committed capital to make investments into portfolio companies. Although it is typical that funds drawdown most of the capital during the first five years, GPs have the autonomy to invest capital even after the investment period ends because of a lack...

Over the years, a diverse range of drawdown measures has evolved to guide asset management. The authors show that almost all these fit into unified framework. This new framework simplifies implementation and improves an understanding their similarities differences. Conceptual differences between translate different rankings portfolios, which document in simulation study. Their research also sho...

An excessive amount of bank erosion along a number of waterways in Illinois and surrounding states exists at the present time. Erosion of stream banks attracts public attention, reduces property values, results in the permanent loss of real estate, increases the turbidity of streams, and accelerates the silting of reservoirs and backwater lakes along stream courses. Among the main causes of ban...

This paper proposes an intelligent trading system using support vector regression optimized by genetic algorithms (SVR-GA) and multilayer perceptron optimized with GA (MLP-GA). Experimental results show that both approaches outperform conventional trading systems without prediction and a recent fuzzy trading system in terms of final equity and maximum drawdown for Hong Kong Hang Seng stock index.

Water-table drawdown across peatlands increases carbon dioxide (CO2) and reduces methane (CH4) emissions. The net climatic effect remains unclear. Based on global observations from 130 sites, we found a positive (warming) climate of water-table drawdown. Using machine-learning-based upscaling approach, predict that peatland driven by drying human activities will increase CO2 emissions 1.13 (95%...