A great deal of attention has recently been focused upon "enhanced oil recovery"; that is, the application of recently developed processes for recovering oil that would normally remain in a reservoir following depletion by conventional techniques. Since this heretofore unrecoverable remaining oil amounts to about 300 billion barrels in the U.S. alone (see Figure 1), one can see why enhanced rec...

Oil-impregnated paper condenser transformer bushings are an important part of equipment, and partial discharge (PD) occurred when defects exist on the aluminum foil layers. Firstly, to study PD process oil-paper insulated capacitance graded bushing with defect broken foil, a defective sample is constructed parameters capacitance, carbonization traces at different voltage levels. Then, in order ...

Foam has been used as an effective displacing fluid for gas mobility control in enhanced oil recovery (EOR) and subsurface remediation. In this study, a series of core flooding experiments are performed on cores with wide permeability ranging from 3.3 to 2749 mD evaluate the impact foam quality performance. It is found that steady-state factor related non-linear, non-monotonic manner. A full ph...

background: ct scan and nuclear medicine exams deliver a great part of medical exposures. this study examined professional radiation hazards in ct scan and nuclear medicine workers.   methods : in a cross sectional study 30 occupationally exposed workers and 7 controls (all from personnel of a laboratory) were selected. physical dosimetry was performed for exposed workers. blood samples were ob...

Introduction: GATE (Geant4 Application for Tomographic Emission) is a Monte Carlo simulation platform developed by the OpenGATE collaboration since 2001 and first publicly released in 2004. In Geant4, each physics process is described by a model (several models are sometimes available for a given physics process) and a corresponding cross-section table. All Geant4 physics model...

Seven pure-culture strains of fungi cultivated by attine ants (ant-garden fungi) were isolated from locally maintained leaf-cutting ant colonies. An ant-garden fungus strain obtained from an Atta cephalotes colony, when offered to ants of the colony from which the fungus was isolated, was accepted as their own. Young fungus cultures were harvested and incorporated into the fungus garden, and cu...

In this paper, a new fractional sub-equation method is proposed for finding exact solutions of fractional partial differential equations (FPDEs) in the sense of modified Riemann-Liouville derivative. With the aid of symbolic computation, we choose the space-time fractional Zakharov-Kuznetsov-Benjamin-Bona-Mahony (ZKBBM) equation in mathematical physics with a source to illustrate the validity a...

Astigmatism’s defect has not yet been formulated in Physics and medical physics books theoretically. In this paper, we are trying to formulate the astigmatism’s defect. The results of formulation show that “the degree of astigmatism is negative reverse the distance that vision’s condition of astigmatism’s chart lines change conditions in dimness angle from dimness condition at infinite distance...