677 research outputs found
Transient currents in a molecular photo-diode
Light-induced charge transmission through a molecular junction (molecular
diode) is studied in the framework of a HOMO-LUMO model and in using a kinetic
description. Expressions are presented for the sequential (hopping) and direct
(tunneling) transient current components together with kinetic equations
governing the time-dependent populations of the neutral and charged molecular
states which participate in the current formation. Resonant and off-resonant
charge transmission processes are analyzed in detail. It is demonstrated that
the transient currents are associated with a molecular charging process which
is initiated by photo excitation of the molecule. If the coupling of the
molecule to the electrodes is strongly asymmetric the transient currents can
significantly exceed the steady state current.Comment: 17 pages, 12 figures, accepted for publication in Chemical Physic
Limitations of the classical phase-locked loop analysis
Nonlinear analysis of the classical phase-locked loop (PLL) is a challenging
task. In classical engineering literature simplified mathematical models and
simulation are widely used for its study. In this work the limitations of
classical engineering phase-locked loop analysis are demonstrated, e.g., hidden
oscillations, which can not be found by simulation, are discussed. It is shown
that the use of simplified dynamical models and the application of simulation
may lead to wrong conclusions concerning the operability of PLL-based circuits
A short survey on nonlinear models of the classic Costas loop: rigorous derivation and limitations of the classic analysis
Rigorous nonlinear analysis of the physical model of Costas loop --- a
classic phase-locked loop (PLL) based circuit for carrier recovery, is a
challenging task. Thus for its analysis, simplified mathematical models and
numerical simulation are widely used. In this work a short survey on nonlinear
models of the BPSK Costas loop, used for pre-design and post-design analysis,
is presented. Their rigorous derivation and limitations of classic analysis are
discussed. It is shown that the use of simplified mathematical models, and the
application of non rigorous methods of analysis (e.g., simulation and
linearization) may lead to wrong conclusions concerning the performance of the
Costas loop physical model.Comment: Accepted to American Control Conference (ACC) 2015 (Chicago, USA
Π‘ΠΈΠ½Ρ ΡΠΎΠ½Π½ΡΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ΄Π²ΠΈΠ³Π°ΡΠ΅Π»Ρ Π΄Π»Ρ ΠΏΡΠΈΠ²ΠΎΠ΄Π° ΠΌΠ΅Ρ Π°Π½ΠΈΠ·ΠΌΠΎΠ² Π² Ρ ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈ Π°Π³ΡΠ΅ΡΡΠΈΠ²Π½ΠΎΠΉ ΡΡΠ΅Π΄Π΅
Π Π΄Π°Π½Π½ΠΎΠΉ ΡΡΠ°ΡΡΠ΅ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ Π²ΠΎΠΏΡΠΎΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠ½Ρ
ΡΠΎΠ½Π½ΡΡ
ΠΌΠ°ΡΠΈΠ½ Π΄ΠΈΡΠΊΠΎΠ²ΠΎΠ³ΠΎ ΡΠΈΠΏΠ° Π³Π΅ΡΠΌΠ΅ΡΠΈΡΠ½ΠΎΠ³ΠΎ ΠΈΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ Π΄Π»Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΡΠΎΡΡΠ°Π²Π΅ ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½ΠΈΡ Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΡΡΠ°ΡΠ»ΠΈ. ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ°ΡΠΈΠ½Ρ Π΄ΠΈΡΠΊΠΎΠ²ΠΎΠ³ΠΎ ΡΠΈΠΏΠ° Ρ ΠΌΠ°Π³Π½ΠΈΡΠΎΡΠ²ΡΠ·Π°Π½Π½ΡΠΌΠΈ Π΄ΠΈΡΠΊΠ°ΠΌΠΈ ΠΈ Π΄Π°Π½Π½ΡΠ΅, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΠΏΡΠΈ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ
ΠΏΠΎΡΠ΅ΡΡ Π² Π³Π΅ΡΠΌΠ΅ΡΠΈΠ·ΠΈΡΡΡΡΠ΅ΠΉ ΠΏΠ΅ΡΠ΅Π³ΠΎΡΠΎΠ΄ΠΊΠ΅ ΠΌΠ°ΠΊΠ΅ΡΠ½ΠΎΠ³ΠΎ ΠΎΠ±ΡΠ°Π·ΡΠ°
Rules of Internal Control of the Broker as a Tool for Risk Management of ML/FT
The article analyzes and identifies the features of a brokerage company as an economic entity, identifies the main risks of a broker in the sphere of ML/FT, and examines the rules of internal control and the requirements imposed on them.
Keywords: internal control, broker, risks, economic securit
Formation of a National Assessment of the Probability of Investing in Fraudulent ICOs
The study covers such concepts as ICO and IPO, their characteristics, similarities and differences. A national estimate of the probability of investing in fraudulent ICOs has been formed. Also, the work is about comparing the likelihood of investing in fraudulent IPOs and ICO.
Keywords: cryptocurrency, block technology, ICO, IP
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