BACKGROUND In diagnostic radiology lead apron, are usually used to protect patients and radiology staff against ionizing radiation. Lead apron is a desirable shield due to high absorption and effective attenuation of x-ray photons in the diagnostic radiology range. OBJECTIVE Although lead aprons have good radiation protection properties, in recent years, researchers have been looking for alte...

Debt Policy, Corporate Taxes, and Discount Rates This paper studies the valuation of assets with debt tax shields when debt policy is a general time-dependent function of the asset’s unlevered cash flows, value, and history. In a continuous-time setting, it shows that the value of a project’s debt tax shield satisfies a partial differential equation, which simplifies to an easily solved ordinar...

Mechanical shields can effectively alleviate the problems of low pesticide utilization and severe environmental pollution. This manuscript uses a computational fluid dynamics (CFD) method to investigate anti-drift mechanism mechanical shields, study airflow forms around them, establish an accurate simulation model. The aerodynamic characteristics six were studied, their effect was compared. The...

[1] Small volcanic edifices, shields with a diameter less than about 20 km, are common and sometimes very abundant features on the plains of Venus. Typically, they form tight or loose clusters of features known as shield fields. Small shields are interpreted to be formed due to small-scale eruptions through numerous and distinct sources, a mode of formation apparently significantly different fr...