30,465 research outputs found
Pairwise Check Decoding for LDPC Coded Two-Way Relay Block Fading Channels
Partial decoding has the potential to achieve a larger capacity region than
full decoding in two-way relay (TWR) channels. Existing partial decoding
realizations are however designed for Gaussian channels and with a static
physical layer network coding (PLNC). In this paper, we propose a new solution
for joint network coding and channel decoding at the relay, called pairwise
check decoding (PCD), for low-density parity-check (LDPC) coded TWR system over
block fading channels. The main idea is to form a check relationship table
(check-relation-tab) for the superimposed LDPC coded packet pair in the
multiple access (MA) phase in conjunction with an adaptive PLNC mapping in the
broadcast (BC) phase. Using PCD, we then present a partial decoding method,
two-stage closest-neighbor clustering with PCD (TS-CNC-PCD), with the aim of
minimizing the worst pairwise error probability. Moreover, we propose the
minimum correlation optimization (MCO) for selecting the better
check-relation-tabs. Simulation results confirm that the proposed TS-CNC-PCD
offers a sizable gain over the conventional XOR with belief propagation (BP) in
fading channels.Comment: to appear in IEEE Trans. on Communications, 201
Результаты исследований по разработке и применению алмазно-твердосплавных пластин из алмазов, обработанных физико-химическими методами
Researches of polycrystal diamonds (PCD) from the diamonds processed by physico-chemical
methods are carried out. The method of cleaning of diamonds in peroxysulphate of ammonium and calcium
hypochloride is offered. The method of covering initial diamond micropowders by pyrolitic carbon
is studied. The way for compacting diamond crystals for diamond layer PCD is developed. It is
shown, that chemical processing methods of diamonds promote decrease of parametres of sintering
PCD, and also raise their wear resistance. The drill bits and diamond tool equipped PCD, allows to
expand essentially a range of application drilling technics at the factories of the coal industry
pH-sensitivity of YFP provides an intracellular indicator of programmed cell death.
BACKGROUND: Programmed cell death (PCD) is an essential process for the life cycle of all multicellular organisms. In higher plants however, relatively little is known about the cascade of genes and signalling molecules responsible for the initiation and execution of PCD. To aid with the discovery and analysis of plant PCD regulators, we have designed a novel cell death assay based on low cytosolic pH as a marker of PCD. RESULTS: The acidification that occurs in the cytosol during plant PCD was monitored by way of the extinction of YFP fluorescence at low pH. This fluorescence was recovered experimentally when bringing the intracellular pH back to 7, demonstrating that there was no protein degradation of YFP. Because it uses YFP, the assay is none-destructive, does not interfere with the PCD process and allows time-lapse studies to be carried out. In addition, changes of sub-cellular localisation can be visualised during PCD using the protein of interest fused to RFP. Coupled to a transient expression system, this pH-based assay can be used to functionally analyse genes involved in PCD, using point mutations or co-expressing PCD regulators. Transfecting mBAX and AtBI-1in onion epidermal cells showed that the pH shift is downstream of PCD suppression by AtBI-1. In addition, this method can be used to score PCD in tissues of stably transformed transgenic lines. As proof of principle, we show the example of YFP extinction during xylogenesis in Arabidopsis. This demonstrates that the assay is applicable to PCD studies in a variety of tissues. CONCLUSIONS: The observation that YFP fluorescence is lost during the plant PCD process provides a new tool to study the genetic regulation and cell biology of the process. In addition, plant cell biologists should make a note of this effect of PCD on YFP fluorescence to avoid misinterpretation of their data and to select a pH insensitive reporter if appropriate. This method represents an efficient and streamlined tool expected to bring insights on the process leading to the pH shift occurring during PCD
Performance of Six- and Ten-story Reinforced Concrete Buildings Designed by using Modified Partial Capacity Design (M-PCD) Method with 70% Shear Force Ratio
One design alternative of earthquake resistant building is Partial Capacity Design
(PCD) method. Unlike the commonly used capacity design method, PCD allows a safe failure
mechanism which is called partial sidesway mechanism. In this mechanism, all beams and some
columns are allowed to experience plastic damages while some selected columns are designed to
remain elastic (called elastic columns). A new approach to predict the required strengths needed
to design each structural member, called modified-PCD (M-PCD) is proposed. In this research six�and ten-story reinforced concrete buildings were designed using M-PCD, and their seismic
performances are investigated. The base shear force resisted by the elastic columns was set to
approximately 70% of the total base shear. Both nonlinear static procedure (NSP) and nonlinear
dynamic procedure (NDP) are used to analyze the structures. The results show that the expected
partial side sway mechanism is observed, and the drifts of the buildings are acceptable
On the Applicability of HF and μ-PCD Methods for Determination of Carrier Recombination Lifetime in the Non-passivated Single-crystal Silicon Samples
Comparison of the results of measuring the carrier recombination lifetime in silicon single crystals by contactless HF and microwave μ-PCD methods was carried out. It has been shown that HF method gives a large error compared with a μ-PCD method.
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Ultrafast sensing of photoconductivity decay using microwave resonators
Microwave reflectance probed photoconductivity (or -PCD) measurement
represents a contactless and non-invasive method to characterize impurity
content in semiconductors. Major drawbacks of the method include a difficult
separation of reflectance due to dielectric and conduction effects and that the
-PCD signal is prohibitively weak for highly conducting samples. Both of
these limitations could be tackled with the use of microwave resonators due to
the well-known sensitivity of resonator parameters to minute changes in the
material properties combined with a null measurement. A general misconception
is that time resolution of resonator measurements is limited beyond their
bandwidth by the readout electronics response time. While it is true for
conventional resonator measurements, such as those employing a frequency sweep,
we present a time-resolved resonator parameter readout method which overcomes
these limitations and allows measurement of complex material parameters and to
enhance -PCD signals with the ultimate time resolution limit being the
resonator time constant. This is achieved by detecting the transient response
of microwave resonators on the timescale of a few 100 ns \emph{during} the
-PCD decay signal. The method employs a high-stability oscillator working
with a fixed frequency which results in a stable and highly accurate
measurement.Comment: 7 pages, 6 figures+Supplementary Material
Electric discharge grinding of polycrystalline diamond materials
The poor electric conductivity of polycrystalline diamond (PCD) makes it difficult to machine with the conventional EDM process. Inappropriate selection of parameters of the power generator and the servo system leads to unstable working condition and low material removal rate. This paper introduces a method to find optimal parameters in the Electrical Discharge Grinding (EDG) of PCD materials with Taguchi method. The theory and detailed procedures are presented, experimental results are analyzed. The optimized configuration was validated through confirmation tests
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