scholarly journals Quick Performance Assessment of Improved Nyquist Pulses

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Nicolae Dumitru Alexandru ◽  
Felix Diaconu
Keyword(s):  
Energy Distribution ◽  
Error Probability ◽  
Figure Of Merit ◽  
Timing Error ◽  
Asymptotic Decay ◽  
Figures Of Merit ◽  
Timing Offset ◽  
Nyquist Pulses ◽  
The Difference ◽  
Asymptotic Decay Rate

An explanation is proposed for the improved behavior of the improved Nyquist pulses with an asymptotic decay rate of t-2 when sampled with a timing offset. Three figures of merit that indicate the energy distribution into the sidelobes of the time response and allow a quick assessment of their performance in terms of error probability when the impulse response is sampled with a timing error have been proposed and verified on several improved Nyquist pulses reported in the literature. In order to check the validity of the proposed figures of merit a novel family of Nyquist pulses denoted as power sine was introduced. Using the proposed approach the design process was expedited as the volume of necessary calculations was significantly decreased. To explain the difference in close pulse performance a figure of merit based on limited ISI distortion was introduced.

Proteins and direct methods

1991 ◽  
Vol 197 (3-4) ◽  
Author(s):  
Fan Hai-fu ◽  
Hao Quan ◽  
M. M. Woolfson
Keyword(s):  
First Principles ◽  
Figure Of Merit ◽  
Direct Methods ◽  
Large Structure ◽  
Low Resolution ◽  
Figures Of Merit ◽  
Large Structures ◽  
Resolution Data

AbstractConventional direct methods, which work so well for small structures, are less successful for macromolecules. Where it has been demonstrated that a solution might be found using direct methods it is then found that the usual figures of merit are unable to distinguish the few good sets of phases from the large number of sets generated. The reasons for the difficulties with very large structures are considered from a first-principles approach taking into account both the factors of having a large number of atoms and low resolution data. A proposal is made for trying to recognize good phase sets by taking a large structure as a sum of a number of smaller structures for each of which a conventional figure of merit can be applied.

ASYMPTOTIC DECAY TOWARD THE PLANAR RAREFACTION WAVES FOR A MODEL SYSTEM OF THE RADIATING GAS IN TWO DIMENSIONS

2008 ◽  
Vol 18 (04) ◽  
pp. 511-541 ◽  
Author(s):  
WENLIANG GAO ◽  
CHANGJIANG ZHU
Keyword(s):  
Cauchy Problem ◽  
Maximum Principle ◽  
Coupled System ◽  
Model System ◽  
Two Dimensions ◽  
Rarefaction Waves ◽  
Asymptotic Decay ◽  
The Maximum Principle ◽  
The Cauchy Problem ◽  
Asymptotic Decay Rate

In this paper, we consider the asymptotic decay rate towards the planar rarefaction waves to the Cauchy problem for a hyperbolic–elliptic coupled system called as a model system of the radiating gas in two dimensions. The analysis based on the standard L2-energy method, L1-estimate and the monotonicity of profile obtained by the maximum principle.

scholarly journals Mismatch Based Diagnosis of PV Fields Relying on Monitored String Currents

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Pierluigi Guerriero ◽  
Luigi Piegari ◽  
Renato Rizzo ◽  
Santolo Daliento
Keyword(s):  
Energy Production ◽  
Figure Of Merit ◽  
Diagnostic Method ◽  
Medium Size ◽  
Time Interval ◽  
Instantaneous Power ◽  
Maximum Value ◽  
The Difference ◽  
Definition Of ◽  
Day By Day

This paper presents a DC side oriented diagnostic method for photovoltaic fields which operates on string currents previously supplied by an appropriate monitoring system. The relevance of the work relies on the definition of an effective and reliable day-by-day target for the power that every string of the field should have produced. The procedure is carried out by comparing the instantaneous power produced by all solar strings having the same orientation and by attributing, as producible power for all of them, the maximum value. As figure of merit, the difference between the maximum allowed energy production (evaluated as the integral of the power during a defined time interval) and the energy actually produced by the strings is defined. Such a definition accounts for both weather and irradiance conditions, without needing additional sensors. The reliability of the approach was experimentally verified by analyzing the performance of two medium size solar fields that were monitored over a period of four years. Results allowed quantifying energy losses attributable to underperforming solar strings and precisely locating their position in the field.

scholarly journals Effect of machining polarity on single discharge characteristics in micro-EDM

2020 ◽  
Vol 191 ◽  
pp. 04004
Author(s):  
Kan Wang ◽  
Yong Liu
Keyword(s):  
Energy Distribution ◽  
Electrical Discharge Machining ◽  
Micro Edm ◽  
Positive Polarity ◽  
Discharge Characteristics ◽  
Micro Electrical Discharge Machining ◽  
Crater Size ◽  
Single Discharge ◽  
Plasma Radius ◽  
The Difference

In micro electrical discharge machining (micro-EDM), polarity effect is attributed to the difference in energy distribution into the anode and cathode. Understanding the effect of machining polarity on energy distribution bears significance in predicting and controlling machining performances. Single discharge experiments were conducted in this study, to explore single discharge characteristics. The plasma radius and energy distribution were calculated by combining the crater size and the electro-thermal model. The results show that the influence of discharge current on crater depth-to-diameter ratio (H/D) is not significant with positive polarity. The plasma radius, fraction of energy transferred to workpiece, and crater size are greater for micro-EDM with negative polarity than positive polarity.

scholarly journals RF Performance of Si/SiGe MODFETs: A Simulation Study

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 325-330
Author(s):  
S. Roy ◽  
A. Asenov ◽  
S. Babiker ◽  
J. R. Barker ◽  
S. P. Beaumont
Keyword(s):  
State Of The Art ◽  
Strong Dependence ◽  
Intrinsic Noise ◽  
Performance Potential ◽  
Figures Of Merit ◽  
Analysis Technique ◽  
Channel Velocity ◽  
The Difference ◽  
Rf Performance ◽  
Gate Region

The microwave performance potential of Si/SiGe pseudomorphic MODFETs are studied, in comparison to state of the art InGaAs pseudomorphic HEMTs. Both devices have equivalent structures corresponding to a physical HEMT used for calibration. We use an RF analysis technique based on transient Monte Carlo simulations to estimate the intrinsic noise figures, the RF figures of merit fT and fmax, and the effect of contact and gate resistances. Both devices exhibit velocity overshoot below the gate region. It is shown that the difference in noise figures and fT values can be mainly attributed to differences in device channel velocity, fmax exhibits a strong dependence on device contact resistance, eroding some of the performance advantage of the pseudomorphic HEMT.

Economies of scale in queues with sources having power-law large deviation scalings

1996 ◽  
Vol 33 (3) ◽  
pp. 840-857 ◽  
Author(s):  
N. G. Duffield
Keyword(s):  
Power Law ◽  
Generating Functions ◽  
Economies Of Scale ◽  
Shape Function ◽  
Large Deviation ◽  
Rate Function ◽  
Uhlenbeck Process ◽  
Asymptotic Decay ◽  
Potential Structure ◽  
Asymptotic Decay Rate

We analyse the queue QL at a multiplexer with L sources which may display long-range dependence. This includes, for example, sources modelled by fractional Brownian motion (FBM). The workload processes W due to each source are assumed to have large deviation properties of the form P[Wt/a(t) > x] ≈ exp[– v(t)K(x)] for appropriate scaling functions a and v, and rate-function K. Under very general conditions limL→xL–1 log P[QL > Lb] = – I(b), provided the offered load is held constant, where the shape function I is expressed in terms of the cumulant generating functions of the input traffic. For power-law scalings v(t) = tv, a(t) = ta (such as occur in FBM) we analyse the asymptotics of the shape function limb→xb–u/a(I(b) – δbv/a) = vu for some exponent u and constant v depending on the sources. This demonstrates the economies of scale available though the multiplexing of a large number of such sources, by comparison with a simple approximation P[QL > Lb] ≈ exp[−δLbv/a] based on the asymptotic decay rate δ alone. We apply this formula to Gaussian processes, in particular FBM, both alone, and also perturbed by an Ornstein–Uhlenbeck process. This demonstrates a richer potential structure than occurs for sources with linear large deviation scalings.

The Energy Distribution of Tire-Road Noise and Noisy Speech Based on Wavelet Packet

2011 ◽  
Vol 464 ◽  
pp. 721-724 ◽  
Author(s):  
Zhi Yong He ◽  
Li Heng Luo
Keyword(s):  
Energy Distribution ◽  
Speech Enhancement ◽  
Mobile Communications ◽  
Wavelet Packet ◽  
Noise Signal ◽  
Wavelet Packets ◽  
Road Noise ◽  
Noisy Speech ◽  
Time Frequency ◽  
The Difference

Speech enhancement is very important for mobile communications or some other applications in car. The energy distribution of signal is the basis of algorithms which denoise noisy speech in time-frequency domain. In this work, the noise regarded is the tire-road noise when driving in expressway. Wavelet packets transform is used in the analysis. After decomposing noise signal and noisy speech signal by wavelet packet transform, the analysis for the difference of the energy distribution between noisy speech and noise is finished.

POLARIZED PARITY VIOLATING ELECTRON SCATTERING ON 3H AND ITS RELATION TO THE 3He CASE

2000 ◽  
Vol 09 (01) ◽  
pp. 1-16
Author(s):  
S. L. MINTZ ◽  
G. M. GERSTNER ◽  
M. A. BARNETT ◽  
M. POURKAVIANI
Keyword(s):  
Electron Scattering ◽  
Strange Quark ◽  
Form Factors ◽  
High Sensitivity ◽  
Figures Of Merit ◽  
Weak Minimum ◽  
Sharp Variation ◽  
The Asymmetry ◽  
The Difference ◽  
Asymmetry Parameters

We calculate the asymmetry parameters, A, and figures-of-merit for polarized parity violating electron scattering from 3 H via the reaction, e- + 3 H → 3 H + e- for incident electron energies of 1.0 GeV, 2.0 GeV, and 4.0 GeV. We find a sharp variation in A due to cancellations between the weak and electromagnetic form factors caused by the different q2 dependences of these form factors. These variations are similar to those found in the asymmetry for the reaction, e- + 3 He → e- + 3 He but occur at different angles due to the difference in form factors for the two cases. We find that at small angles, the asymmetry may be obtained to reasonably high accuracy for all energies considered and that there is a weak minimum in it at small angles for all of the energies considered here. We show that it might be possible to observe strange quark contributions to the asymmetry at this minimum due to the high sensitivity of A to strange quark contributions in this region. In addition we find that the asymmetry and figures of merit are in the range of those for other proposed target nuclei.

Reversed de Wolff figure of merit and its application to powder indexing solutions

2013 ◽  
Vol 46 (5) ◽  
pp. 1277-1282 ◽  
Author(s):  
R. Oishi-Tomiyasu
Keyword(s):  
Figure Of Merit ◽  
Zero Point ◽  
Figures Of Merit

Two new figures of merit for powder indexing solutions are proposed: the reversed figure of meritMnRevand the symmetric figure of meritMnSym. These are naturally suggested by the theory underlying the de Wolff figure of meritMn. Nevertheless,MnRevhas characteristics opposite to those ofMnwith regard to sensitivity to impurity peaks and extinct reflections.MnSymhas intermediate properties betweenMnandMnRev. Applications of the new figures of merit to powder indexing solutions and zero-point shift estimation are introduced. All of the figures of merit are available from the powder auto-indexing softwareConograph(http://sourceforge.jp/projects/conograph/; http://research.kek.jp/people/rtomi/ConographGUI/web_page.html).

scholarly journals Thermal Ranges and Figures of Merit for Gold-Containing Precursors For ALD

2020 ◽  
Author(s):  
Matthew Griffiths ◽  
Zachary Dubrawski ◽  
Peter Gordon ◽  
Marcel Junige ◽  
Sean Barry
Keyword(s):  
Atomic Layer Deposition ◽  
Chemical Vapour Deposition ◽  
Figure Of Merit ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Thermal Characteristics ◽  
Atomic Layer ◽  
Figures Of Merit ◽  
Layer Deposition

A survey of known gold-containing chemical vapour deposition (CVD) and atomic layer deposition (ALD) precursors, with a focus on collecting their volatilization and decomposition data. These data were applied to a figure of merit (σ) developed to easily assess the thermal characteristics.

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