Multi-user Orthogonal Frequency Division Multiplexing (OFDM) currently is of great interest to telecommunication researchers all over the world. Independently, significant research is being done on the OFDM physical layer (PHY), as well as on resource optimization and other medium access control layer (MAC) related issues. The MAC and PHY communities, however, develop their solutions mostly in ...

this paper investigates the multi-band ofdm (mb-ofdm) based physical (phy) layer proposal for ieee 802.15.3a working group on short-range high data-rate ultra-wide-band (uwb) communications. an overview of the mb-ofdm phy layer architecture with its various parameters is presented and the optimal choice of critical parameters is discussed. next, we derive the theoretical un-coded bit error rate...

In 2 simultaneous experiments (Exp. 1 and Exp. 2), the effects of benzoic acid (BA) and phytase (Phy) in low-P diets on bone metabolism, bone composition, and bone stability in growing and growing-finishing pigs were examined. Experiment 1 was conducted with 16 crossbred gilts in the BW range of 25 to 66 kg of BW, whereas in Exp. 2, 32 crossbred gilts (25 to 108 kg of BW) were used. All pigs we...

We examine the peak performance of an 802.11n system with respect to the achievable throughput and we decompose the gains observed due to the various PHY/MAC layer features offered from 802.11n. Our results show that while the MIMO PHY and channel bonding offered from 802.11n increase the PHY data rate, packet aggregation and block acknowledgment are required to achieve throughput closer to the...

In this brief note, we reconsider the problem of finding Euclidean wormhole solutions to maximal supergravity in d dimensions. We find that such solutions exists for all d ≤ 9. However, we argue that, in toroidally-compactified string theories, these saddle points never contribute to the path integral because of a tension with U-duality. Research supported by NSF Grants PHY-0505757, PHY-0555575...

An experiment was carried out to evaluate the effects of different nutritional strategies on nitrogen (N), phosphorus (P) and calcium (Ca) balance and on copper (Cu), manganese (Mn) and zinc (Zn) excretion in broilers during the periods of 1 to 21 days and 1 to 46 days of age. Four hundred male Cobb-500 broilers were used. A randomized block experimental design was applied, including five treat...

The binding of [3H]physalaemin [( 3H]PHY) to rat brain membranes is specific, saturable and reversible in the presence of monovalent cations and peptidase inhibitors. Monovalent cations increase the binding of [3H]PHY in an ionic strength (mu)-dependent manner with an optimal effect at mu higher than 0.3. Addition of 2.5 mM MnCl2 results in a 2-fold increase in the affinity (KD) and a 40% incre...

We have measured the differential cross sections for the production of π, K, K, K, φ, p, Λ and their corresponding antiparticles in separate samples of flavor-tagged Z → light-flavor (uū, dd̄, or ss̄), Z → cc̄ and Z → bb̄ events. Clear flavor dependences are observed, and the results are compared with the predictions of three fragmentation models. We have also performed a direct measurement of As, ...

The phytochrome (phy) photoreceptors modulate plant development after perception of light. Upon illumination of etiolated seedlings, phys initiate a transcriptional cascade by directly transducing light signals to the promoters of genes encoding regulators of morphogenesis. In light-grown plants, however, little is known about the transcriptional cascade modulated by phys in response to changes...

The regulatory photoreceptor phytochrome controls the transcription of its own phy genes in a negative feedback fashion. We have exploited microprojectile-mediated gene transfer to develop a rapid transient expression assay system for the study of DNA sequences involved in the phytochrome-regulated expression of these genes. The 5'-flanking sequence and part of the structural region of an oat p...