We demonstrate that Daubechies wavelets can be used to construct a minimal set of optimized localized adaptively contracted basis functions in which the Kohn-Sham orbitals can be represented with an arbitrarily high, controllable precision. Ground state energies and the forces acting on the ions can be calculated in this basis with the same accuracy as if they were calculated directly in a Daub...

Wholesale electricity markets are becoming ubiquitous, offering consumers access to competitively-priced energy. The cost of energy is often correlated with its environmental impact; for example, environmentally sustainable forms of energy might benefit from subsidies, while the use of high-carbon sources might be discouraged through taxes or levies. Reacting to real-time electricity price fluc...

This paper discusses the design and implementation of a profile-based power-aware compiler using dynamic voltage scaling. The compiler identifies program regions where the CPU can be slowed down without resulting in a significant overall performance loss. Two strategies have been implemented in SUIF2. The single-region strategy slows down a single region for energy savings, while the multiple-r...

In this paper, we present a Branch Target Buuer (BTB) design for energy savings in set-associative instruction caches. We extend the functionality of a BTB by caching way predictions in addition to branch target addresses. Way prediction and branch target prediction are done in parallel. Instruction cache energy savings are achieved by accessing one cache way if the way prediction for a fetch i...

In this paper we present a Branch Target Bu er BTB design for energy savings in set associative in struction caches We extend the functionality of a BTB by caching way predictions in addition to branch target addresses Way prediction and branch target prediction are done in parallel Instruction cache energy savings are achieved by accessing one cache way if the way pre diction for a fetch is av...

Current centralized urban water supply depends largely on energy consumption, creating critical water-energy challenge especially for many rapid growing Asian cities. In this context, harvesting rooftop rainwater for non-potable use has enormous potential to ease the worsening water-energy issue. For this, we propose a geographic information system (GIS)-simulation-based design system (GSBDS) t...

Chilled-water cooling systems used in the chemical processing, petroleum manufacturing, and power generation industries remain fertile ground for electrical energy savings. This is in spite of the lack of attention given to industrial cooling by energy auditors and rebate program designers. This article discusses the large energy savings that can be achieved through hardware and operational imp...

This paper describes modeling and simulation of air compressor energy use to estimate energy savings in compressed air systems from air use reduction and other changes. The method uses measured power signatures and other compressor parameters as inputs to calculate various performance metrics and estimate energy savings. To enable recognition of control mode from measured power data, examples o...

Filter cache has been proposed as an energy saving architectural feature [9]. A filter cache is placed between the CPU and the instruction cache (I-cache) to provide the instruction stream. Energy savings result from accesses to a small cache. There is however loss of performance when instructions are not found in the filter cache. The majority of the energy savings from the filter cache in hig...

Energy saving strategies such as formation flight and near-ground flight are frequently exploited in nature. The energy reduction mechanisms of these approaches are conceptually simple; however, the unsteady wake vortex structures that result from flapping may provide additional benefits. Since these flight strategies offer increased energy savings over simple flight situations, they have recei...