Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 296 for “"FIR"”.
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Power reducing algorithms in FIR filters
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Optimisation of multiplier-less FIR filter design techniques
… of multiplier-less (ML) finite impulse response (FIR) digital filters. The use of multiplier-less digital filters results in simplified filtering structures, better throughput rates and higher speed. These characteristics are very desirable in many DSP systems. This thesis concentrates on the …
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Effects of Thermomechanical Refining on Douglas fir Wood
… In cooperation with a North American MDF Douglas fir plant, two refining energies were used to produce resin and additive-free fibers. Refining reduced fiber dimensions and increased bulk density, more so at the highest energy. Thermoporosimetry showed increases in sub-micron scale porosity, …
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Developing DRIS norms for Fraser fir Christmas trees
Fraser fir [Abies fraseri (Pursh) Poir.] is an important Christmas tree species in Virginia. Because it is responsive to fertilization, and because most Fraser fir growers fertilize their crop, a scientifically-based nutrient diagnosis and fertilizer recommendation system is needed. The objective …
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Role of mycorrhizal networks in dry Douglas-fir forests
… interplant resource transfer. Interior Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) is an obligate ectomycorrhizal (EM) tree species that has high potential to form MNs with neighboring trees because of its receptivity to a diverse community of EM fungi. This MN potential is …
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SILVER FIR AND ITS PROVENANCES IN A CLIMATE CHANGE PERSPECTIVE
CHAPTER 2: Drought responses of Italian silver fir provenances in a climate change perspective. In a climate change perspective, the resilience of Mediterranean forest ecosystems is closely linked to their ability to cope with drought and rising temperatures. This ability can be influenced by …
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Extractives of Douglas-fir and Their Impacts for Biofuel Saccharification
… and other unmerchantable timber. Douglas-fir residues have received special attention since Douglas-fir is the most abundant tree in the timberlands of the Western United States. Biofuel from this material has yet to hit full-scale production, but production processes are already being …
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Stimulated Raman and hyper-Raman scattering in the FIR region
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-28T13:59:43Z No. of bitstreams: 1 1980_kim.pdf: 2258540 bytes, checksum: 8fe0d75ab8a852db2e65274e4407c4b5 (MD5)
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Perfect Reconstruction Filter Bank Structure Based On Interpolated FIR Filters
… a new filter bank structure, the interpolated FIR (IFIR) filter bank is developed. Such a structure combines the concepts of filter banks, and interpolated FIR filters. The filter design procedures for the IFIR filter bank are developed and explained. The resulting structure was compared with …
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Activation energy of Douglas fir char gasification by carbon dioxide
The activation energy of Douglas fir wood char gasified in carbon dioxide was determined. Activation energies were found for chars that had been pyrolyzed in nitrogen at 600, 750, and 900°C. A thermogravimetric analyzer provided the weight versus temperature data used to obtain the activation …
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Stand structure, growth, and mortality in southern Appalachian spruce-fir
… plots at three southern Appalachian spruce-fir sites (Mt. Rogers National Recreation Area (NRA) of Virginia, the Black Mountains of North Carolina, and the Great Smoky Mountains of Tennessee and North Carolina). Baseline conditions were documented to accommodate future efforts to determine …
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FIR filter design using Jacobian elliptic Sn function with wavelet applications.
This thesis presents a new method of digital FIR filter design based on the Jacobian elliptic sine function. In addition to a general design, a special result is obtained for Quadrature Mirror Filters (QMF) for use in multi-resolution filter banks. These are called Quasi-Dyadic FIR filters. Most of …
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The Physiological Ecology of Fraser FIr in Southern Appalachian Cloud Forests
Fraser fir (Abies fraseri (Pursh.) Poiret is a tree species endemic to the southern Appalachian Mountains, USA. This species is found in only six mountain-top populations in that span between southwestern Virginia and the Great Smoky Mountains of western North Carolina and eastern Tennessee. …
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Novel Digital Alias-Free Signal Processing Approaches to FIR Filtering Estimation
… stratified (AnSt) random sampling techniques. First, I introduce a finite impulse response (FIR) filter estimator for each of the three considered techniques. In addition, a generalised estimator that encompasses the three filter estimators is also proposed. Then, statistical properties of all …
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Seedborne fusarium and root colonization of container-grown douglas-fir seedlings
… in root colonization of container-grown Douglas-fir seedlings was studied in two coastal Douglas-fir seedlots; one contaminated with Fusarium and the other with minimal Fusarium. Seedlots were treated using either a standing water imbibition, or a running water imbibition with a …
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Two-dimensional zero-phase FIR filter design with nonuniform frequency sampling
… Three main types of two-dimensional zero-phase FIR filters that are most frequently used in practice have been considered: rectangular, circular, and 2-D halfband (diamond and fan) FIR filters. At least two sampling techniques for each filter type have been proposed and examined. Common features …
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A hybrid digital FIR lattice filter for PRML magnetic read channel
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Investigating Differences in Douglas-fir and Southern Yellow Pine Bonding Properties
… pine (represented by Pinus taeda) and Douglas-fir (Pseudotsuga menziesii) mature and juvenile wood were examined in terms of density, chemical composition, surface energy, shear stress, % wood failure, and delamination. Density was measured using a QTRS density scanner. Loblolly pine contained …
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