Methods to analyze well-test data influenced by variable-skin and cleanup effects are introduced, with emphasis on verifications of consistency in drawdown and buildup data. It is shown that a stable cleanup trend can be modeled by a simple hyperbolic skin factor in solutions for wells with constant skin. It is also shown that if the skin effect stabilizes at constant values within the general ...

This study presents some mathematical methods for estimating the critical properties of 40 different types of alkanes and their derivatives including critical temperature, critical pressure and critical volume. This algorithm used QSPR modeling based on graph theory, several structural indices, and geometric descriptors of chemical compounds. Multiple linear regression was used to estimate the ...

A predictive framework is developed and applied to evaluate benefits of multilevel intake configurations in managing temperature TW and turbidity CT,W in water withdrawn from a water supply reservoir, Schoharie Reservoir, New York, that presently, has a single level intake. High values of TW occur in late summer for the reservoir in major drawdown years, and high CT,W levels occur irregularly f...

We discuss the bulk properties of QGP produced at RHIC obtained at time of hadronization. We argue that hadronization of quark–gluon plasma occurs at a critical pressure near to 82 MeV/fm, obtained for SPS energy range.

The underground gas storage (UGS) in depleted sandstone reservoirs forms the largest proportion of UGS market China. Multiple cycles natural injection and production cause rapid increase drawdown pore pressure, which may induce damage to rock skeleton structure, complex fluid flow paths reservoir. In this paper, transverse relaxation time (T2), nuclear magnetism resonance imaging, high-pressure...

In this article, we define new “Greeks” for financial derivatives: sensitivities to the running maximum and the running maximum drawdown of an underlying asset. Some types of portfolios, such as the net asset value of a hedge fund or performance fees are sensitive to these parameters. In order to illustrate the concept of the new “Greeks”, we derive probabilistic representations of sensitivitie...

It has been hypothesized that changes in the marine biological pump caused a major portion of the glacial reduction of atmospheric carbon dioxide by 80 to 100 parts per million through increased iron fertilization of marine plankton, increased ocean nutrient content or utilization, or shifts in dominant plankton types. We analyze sedimentary records of marine productivity at the peak and the mi...

This paper studies drawdown and drawup processes in a general diffusion model. The main result is a formula for the joint distribution of the running minimum and the running maximum of the process stopped at the time of the first drop of size a. As a consequence, we obtain the probabilities that a drawdown of size a precedes a drawup of size b and vice versa. The results are applied to several ...