scholarly journals Laser Opto-Electronic Oscillator and the Modulation of a Laser Emission

2021 ◽  
Author(s):  
Alexander Bortsov
Keyword(s):  
Spectral Line ◽  
Differential Equations ◽  
Low Noise ◽  
Noise Generator ◽  
Dynamic Processes ◽  
Nonlinear Method ◽  
External Modulation ◽  
Mach Zehnder Modulator ◽  
Electronic Oscillator

The autonomous optoelectronic generator (OEO) is considered in the chapter as a source of low-noise oscillations. Differential equations are considered and methods with OEO modulation with direct and external modulation are analyzed. The complexity of both approaches is related to the non-standard way of description of the nonlinear method modulation for the internal (direct) structure and the utilization of the specific Mach-Zehnder modulator for the first stage on external modulation. The purpose of the presentation is to consider the main features of OEO as a low-noise generator. This includes consideration based on the study of differential equations, the study of transients in OEO, and the calculation of phase noise. It is shown that different types of fibers with low losses at small bending radii can be used as a FOLD in OEO. The important role of the choice of a coherent laser for OEO with a small spectral line width is shown. The prospects of using structured fibers with low losses at bends of less than 10 mm in OEO are described. The results of modeling dynamic processes in OEO with direct modulation are presented.

Music and Gesture

2017 ◽  
Author(s):  
Lawrence M. Zbikowski
Keyword(s):  
Dynamic Processes ◽  
Thought Processes ◽  
Human Communication ◽  
Charlie Chaplin ◽  
Swing Time ◽  
The Relationship

This chapter explores the relationship between music and physical gesture, drawing on recent research on the spontaneous gestures that accompany speech. Such gestures appear to be motivated by thought processes that are independent from speech and that in many cases offer analogs for dynamic processes. The chapter outlines the infrastructure for human communication that supports language and gesture as well as music. This outline provides a framework for exploring how music and gesture are similar and for how they are different. These comparisons are made through analyses of the movements Fred Astaire makes while accompanying himself at the piano in the 1936 film Swing Time and those Charlie Chaplin makes to Brahms’s Hungarian Dance No. 5 in the 1941 film The Great Dictator. These analyses further explicate the role of syntactic processes and syntactic layers in musical grammar and introduce referential frameworks, which serve as perceptual anchors for syntactic processes.

Situational Breakdowns

2019 ◽  
Author(s):  
Anne Nassauer
Keyword(s):  
United States ◽  
Large Scale ◽  
Contextual Factors ◽  
The United States ◽  
Social Outcomes ◽  
Dynamic Processes ◽  
Collective Decisions ◽  
Different Types ◽  
The Impact

This book provides an account of how and why routine interactions break down and how such situational breakdowns lead to protest violence and other types of surprising social outcomes. It takes a close-up look at the dynamic processes of how situations unfold and compares their role to that of motivations, strategies, and other contextual factors. The book discusses factors that can draw us into violent situations and describes how and why we make uncommon individual and collective decisions. Covering different types of surprise outcomes from protest marches and uprisings turning violent to robbers failing to rob a store at gunpoint, it shows how unfolding situations can override our motivations and strategies and how emotions and culture, as well as rational thinking, still play a part in these events. The first chapters study protest violence in Germany and the United States from 1960 until 2010, taking a detailed look at what happens between the start of a protest and the eruption of violence or its peaceful conclusion. They compare the impact of such dynamics to the role of police strategies and culture, protesters’ claims and violent motivations, the black bloc and agents provocateurs. The analysis shows how violence is triggered, what determines its intensity, and which measures can avoid its outbreak. The book explores whether we find similar situational patterns leading to surprising outcomes in other types of small- and large-scale events: uprisings turning violent, such as Ferguson in 2014 and Baltimore in 2015, and failed armed store robberies.

Musical shape and feeling

2017 ◽  
Author(s):  
Daniel Leech-Wilkinson
Keyword(s):  
Everyday Life ◽  
Recent Work ◽  
Sensory Perception ◽  
Dynamic Processes ◽  
Sensorimotor System ◽  
Musical Sound ◽  
Sensory Mode ◽  
Daniel Stern

The concept of shape is widely used by musicians in talking and thinking about performance, yet the mechanisms that afford links between music and shape are little understood. Work on the psychodynamics of everyday life by Daniel Stern and on embodiment by Mark Johnson suggests relationships between the multiple dynamics of musical sound and the dynamics of feeling and motion. Recent work on multisensory and precognitive sensory perception and on the role of bimodal neurons in the sensorimotor system helps to explain how shape, as a percept representing changing quantity in any sensory mode, may be invoked by dynamic processes at many stages of perception and cognition. These processes enable ‘shape’ to do flexible and useful work for musicians needing to describe the quality of musical phenomena that are fundamental to everyday musical practice and yet too complex to calculate during performance.

An Integrated Two-Mode Tunable Channelized Low-Noise Active Filter

2018 ◽  
Vol 27 (06) ◽  
pp. 1850090
Author(s):  
Amin Alahyari ◽  
Massoud Dousti ◽  
Mohammad Bagher Tavakoli
Keyword(s):  
Bandpass Filter ◽  
Impedance Matching ◽  
Low Noise ◽  
Active Filter ◽  
Center Frequency ◽  
Pass Filter ◽  
Filter Output ◽  
Band Stop Filter ◽  
Circuit Input

In this paper, a new structure for an integrated channelized active filter is proposed. This filter can be used as a channelized bandpass filter and again as a channelized band-stop filter. This is fulfilled by using one biasing voltage. In designing a three-channel bandpass filter, a recursive differential structure is used. Moreover, by subtracting bandpass filter output from an all-pass output, the proposed three-channel band-stop filter is achieved. A wideband amplifier plays the role of an all-pass filter. In addition, to decrease the noise of this filter, a noise-canceling circuit is adopted. By using this circuit, input impedance matching is obtained simultaneously. The center frequencies of the two-mode channelized filter are 2, 4 and 6[Formula: see text]GHz. In each of them, the center frequency is controlled via two biasing voltages. The maximum center frequency shift is 450[Formula: see text]MHz. For designing the proposed circuit, GaAs 0.15[Formula: see text][Formula: see text]m technology is applied. The occupied area is [Formula: see text][Formula: see text]mm2.

scholarly journals Understanding Screaming Channels: From a Detailed Analysis to Improved Attacks

2020 ◽  
pp. 358-401
Author(s):  
Giovanni Camurati ◽  
Aurélien Francillon ◽  
François-Xavier Standaert
Keyword(s):  
Spatial Diversity ◽  
Low Noise ◽  
Security Evaluation ◽  
The Novel ◽  
Proof Of Concept ◽  
Wireless Devices ◽  
Side Channels ◽  
Security Evaluations ◽  
The One

Recently, some wireless devices have been found vulnerable to a novel class of side-channel attacks, called Screaming Channels. These leaks might appear if the sensitive leaks from the processor are unintentionally broadcast by a radio transmitter placed on the same chip. Previous work focuses on identifying the root causes, and on mounting an attack at a distance considerably larger than the one achievable with conventional electromagnetic side channels, which was demonstrated in the low-noise environment of an anechoic chamber. However, a detailed understanding of the leak, attacks that take full advantage of the novel vector, and security evaluations in more practical scenarios are still missing. In this paper, we conduct a thorough experimental analysis of the peculiar properties of Screaming Channels. For example, we learn about the coexistence of intended and unintended data, the role of distance and other parameters on the strength of the leak, the distortion of the leakmodel, and the portability of the profiles. With such insights, we build better attacks. We profile a device connected via cable with 10000·500 traces. Then, 5 months later, we attack a different instance at 15m in an office environment. We recover the AES-128 key with 5000·1000 traces and key enumeration up to 223. Leveraging spatial diversity, we mount some attacks in the presence of obstacles. As a first example of application to a real system, we show a proof-of-concept attack against the authentication method of Google Eddystone beacons. On the one side, this work lowers the bar for more realistic attacks, highlighting the importance of the novel attack vector. On the other side, it provides a broader security evaluation of the leaks, helping the defender and radio designers to evaluate risk, and the need of countermeasures.

Narcissism Dynamics

2021 ◽  
Author(s):  
Elizabeth A. Edershile ◽  
Aidan G.C. Wright
Keyword(s):  
Dynamical System ◽  
Empirical Research ◽  
Empirical Work ◽  
Theoretical Work ◽  
Self Esteem ◽  
Dynamic Processes ◽  
Cross Sectional ◽  
Complex Dynamical System ◽  
Antagonistic Behavior

The scientific study of narcissism has accelerated in recent years. However, this literature has primarily been cross-sectional and descriptive in nature, making it difficult to integrate with theories of narcissism, which instead emphasize various dynamics. Theoretical work construes narcissism as a complex dynamical system with processes that interact to contribute to narcissism expression and maintenance. We begin by reviewing theoretical accounts of narcissism and what they suggest about dynamic processes. We then review research that examines processes associated with narcissism in naturalistic settings. Integrating clinical theories with empirical work, we highlight remaining tensions in the field and discuss major conceptual considerations. For example, we discuss the role of entitlement and antagonistic behavior within narcissism and the need to identify the temporal ordering of various processes (e.g., self-esteem fluctuations and fluctuations in grandiosity and vulnerability). In light of limitations of the existing literature, we then discuss methodological barriers that currently limit the ability to fully align empirical research with theorized processes within narcissism.

Subpicosecond Study of the Dynamic Processes in Push-Pull Styrenes and the Role of Solvation

1993 ◽  
pp. 628-630
Author(s):  
P. Hébert ◽  
G. Baldacchino ◽  
T. Gustavsson ◽  
V. Kabelka ◽  
P. Baldeck ◽  
...  
Keyword(s):  
Dynamic Processes

Role of Spectral Line Profile in Laser IR Analysis of Multicomponent Gas Mixtures

2019 ◽  
Vol 13 (5) ◽  
pp. 727-738
Author(s):  
Sh. Sh. Nabiev ◽  
S. V. Ivanov ◽  
A. S. Lagutin ◽  
L. A. Palkina ◽  
S. V. Malashevich ◽  
...  
Keyword(s):  
Spectral Line ◽  
Line Profile ◽  
Gas Mixtures ◽  
Multicomponent Gas ◽  
Spectral Line Profile ◽  
Ir Analysis

scholarly journals Fractional Integral Equations Tell Us How to Impose Initial Values in Fractional Differential Equations

Mathematics ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 1093
Author(s):  
Daniel Cao Labora
Keyword(s):  
Differential Equations ◽  
Integral Equations ◽  
Fractional Differential Equations ◽  
Existence And Uniqueness ◽  
Fractional Integral ◽  
Initial Value ◽  
Major Question ◽  
Initial Values ◽  
Fractional Differential

One major question in Fractional Calculus is to better understand the role of the initial values in fractional differential equations. In this sense, there is no consensus about what is the reasonable fractional abstraction of the idea of “initial value problem”. This work provides an answer to this question. The techniques that are used involve known results concerning Volterra integral equations, and the spaces of summable fractional differentiability introduced by Samko et al. In a few words, we study the natural consequences in fractional differential equations of the already existing results involving existence and uniqueness for their integral analogues, in terms of the Riemann–Liouville fractional integral. In particular, we show that a fractional differential equation of a certain order with Riemann–Liouville derivatives demands, in principle, less initial values than the ceiling of the order to have a uniquely determined solution, in contrast to a widely extended opinion. We compute explicitly the amount of necessary initial values and the orders of differentiability where these conditions need to be imposed.

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