As with previous emerging technologies, there have been uncertainties and concerns about the environmental and health risks associated with nanotechnology. This article reviews some of the ongoing efforts to better understand and characterize...
Infrastructure, biomass conversion, sources of biomass, and environmental and other impacts are some of the challenges facing the commercialization of biofuels.
Paul A. Jennings
Whatever problems may be caused by climate change, engineers will be expected to solve them.Now is the time to begin addressing the issues at the local and regional scale.
Robert J. Conroy, Daniel R. Webb, Robert D. Rounding, Umesh Mathur
This methodology, based on steady-state and dynamic simulation, can be used to develop the necessary models— and avoid disruptive and costly step testing to the extent feasible.
Kristin M. Malosh
Achieving and maintaining ISO 14000 certification for an environmental management system (EMS) is a difficult task that can be made easier by following these suggestions.
Tomas B. Co
Dynamic process modeling based on non-uniformly sampled data and multiple sampling runs, even for nonlinear systems, can be performed using spreadsheet implementations of the weighted-least-squares (WLSQ) and Runge-Kutta WLSQ methods.
Rising gas prices and climate uncertainty have thrust energy and environmental policy to the forefront of modern American politics.
Travis W. Walker
Before solar and wind energy can be widely exploited, a method for storing the energy provided by these intermittent sources and releasing it as demand arises must be developed.
Henry Z. Kister
When designing a new distillation column or revamping an existing one, it is important to understand the factors that affect overall tray efficiency.
William Ho Liam Teng, Gregory T. Benz
Issues such as sterility, isolation and contamination must be considered when choosing seals for use in biotech and pharmaceutical processes. This overview describes common types of seals and offers guidance on selecting the appropriate seal for...
Engineers typically don’t learn the “soft skills” of team and project management in school. Here is a game plan to help you supplement your technical expertise with effective leadership.
Gary K. Patterson, David S. Dickey
Understanding when and why mixing fails in the laboratory is often the only way of avoiding a similar failure in a production-scale reactor. Here we examine mixing in stirred-tank reactors and provide guidance on scale-up.
Mark E. Jones, Keith J. Watson, William F. Banholzer
Considering the range of possibilities and constraints, a major transformation of the chemical industry's current capital structure is unlikely for at least a few decades.
John D. Barry
This article introduces a novel approach to solving flow and pipe-sizing problems based on two new dimensionless quantities that are independent of line size and flow.
Robert J. Fisher, Thomai Panagiotou
This continuous bottom-up approach allows precise control of the crystallization process to achieve size, distribution and quality goals, as well as realize the benefits of process intensification.
David E. Gushee, Bernard S. Lee
A broad-based, multi-year effort is required to develop and demonstrate massive electricity-storage technologies that are both reliable and economical.
William M. Stahl
Match a material's performance to process conditions to reduce leaks, improve safety and extend the mean time between failures (MTBF).
Ethanol, the leading incumbant biofuel, has several limitations.Butanol overcomes many of these, and holds promise as the next important transportation biofuel.
Follow these guidelines to prevent fouling, scaling and degradation of reverse osmosis membranes.