A new guidance scheme for the problem of Low-thrust transfer between inclined orbits is developed within the framework of optimal control theory. The objective of the guidance scheme is to provide the appropriate thrust steering program that will transfer the vehicle from an inclined low earth orbits to the high earth orbits. The presented guidance scheme is determined using Pontryagin’s princi...

nuclear materials. The Committee will undertake studies and activities related to nuclear materials and waste management such as transportation, waste determinations, reprocessing, storage and disposal facilities, in situ leaching mining, mill tailings, enrichment facilities, health effects, decommissioning, materials safety, application of risk-informed, performance-based regulations, and eval...

The U.S. Environmental Protection Agency (EPA) Engineering Issue papers are a series of documents that summarize the available information on specific contaminants, selected treatment and site remediation technologies, and related issues. This Engineering Issue paper is intended to provide remedial project managers (RPMs), on-scene coordinators (OSCs), contractors, and other state or private re...

This article reports the findings of an international survey of nanomaterials firms and laboratories regarding their environmental health and safety (EHS) programs, engineering controls, personal protective equipment (PPE), exposure monitoring, waste disposal, product stewardship, and risk beliefs. While many participants reported not believing that nanomaterials pose special risks, nanospecifi...

16 There has been growing interest in establishing food waste prevention and recovery 17 programs throughout the world. The drive to target food waste stems from increasing concerns 18 about resource conservation, food security, food waste’s environmental and economic costs, and 19 a general trend in the waste management industry to transition to more sustainable practices. 20 Here the drivers ...

Short-term travel time prediction is very important to the real time travelers’ information and route guidance system. Various methodologies have been developed for dynamic travel time prediction. However, most of the existing studies presume that path travel time is the simple addition of travel times on the consisting links. Through simulation, it is shown that, under recurrent traffic condit...

The identification and quantitation of non-method-specific target analytes have greater importance with respect to EPA's current combustion strategy. The risk associated with combustion process emissions must now be characterized. EPA has recently released draft guidance on procedures for the collection of emissions data to support and augment site-specific risk assessments (SSRAs) as part of t...