219 research outputs found
Magnetic loop antenna with electronic tuning for frequencies below 30MHz
Tento projekt se zabĂœvĂĄ nĂĄvrhem elektronickĂ©ho ladÄnĂ a automatizovanĂ©ho pĆizpĆŻsobenĂ magnetickĂœch, smyÄkovĂœch antĂ©n, pracujĂcĂch v oblasti krĂĄtkĂœch vln. CelĂĄ prĂĄce je rozdÄlena do tĆĂ ÄĂĄstĂ (ladĂcĂ, pĆizpĆŻsobovacĂ a ĆĂdĂcĂ). LadĂcĂ ÄĂĄst je realizovanĂĄ zmÄnou kapacity pomocĂ kaskĂĄdy kondenzĂĄtorĆŻ a pĆizpĆŻsobovĂĄnĂ je provedeno rĆŻznĂœmi zmÄnami bodĆŻ napĂĄjenĂ. CelĂœ systĂ©m je ĆĂzen mikroprocesorem ATmega16. Dle poĆŸadavkĆŻ obsluĆŸnĂ©ho programu, spĂnĂĄ mikroprocesor pĆĂsluĆĄnĂ© kapacity, ÄĂmĆŸ ladĂ antĂ©nu na potĆebnĂœ kmitoÄet, pracovĂĄvĂĄ informace o vĂœkonovĂ©m pĆizpĆŻsobenĂ a automaticky dolaÄuje antĂ©nu zmÄnou polohy napĂĄjenĂ.This project deals with electronic tuning and automated adjustment of magnetic loop antennas, working in the High Frequencys. The whole work is divided into three parts tuning, adjustment and control). The tuning part is realized by changing the capacity of the array capacitors and adjustment is done by different changes of power points. The whole system is controlled by a microprocessor ATmega16. According to utility switches the microprocessor capacity, which tunes the antenna to the required frequency, processes information about power adjustment and autimatically fine-tuning the antenna by changing the position of charging.
âSub-Primeâ Water, Low-Security Entitlements and Policy Challenges in Over-Allocated River Basins: the Case of the MurrayâDarling Basin
Environmental policy is often implemented using market instruments. In some cases, including carbon taxing, the links
between financial products and the environmental objectives, are transparent. In other cases, including water markets, the
links are less transparent. In Australiaâs MurrayâDarling Basin (MDB), financial water products are known as âentitlementsâ,
and are similar to traditional financial products, such as shares. The Australian water market includes âLow Securityâ
entitlements, which are similar to âsub-primeâ mortgage bonds because they are unlikely to yield an amount equal to their
financial worth. Nearly half the water purchased under the MurrayâDarling Basin Plan for environmental purposes is âLow
Securityâ. We suggest that the current portfolio of water held by the Australian Government for environmental purposes
reflects the mortgage market in the lead-up to the global financial crisis. Banks assumed that the future value of the mortgage
market would reflect past trends. Similarly, it is assumed that the future value of water products will reflect past trends,
without considering climate change. Historic records of allocations to âLow Securityâ entitlements in the MDB suggest that,
in the context of climate change, the Basin Plan water portfolio may fall short of the target annual average yield of 2075 GL
by 511 GL. We recommend adopting finance sector methods including âhedgingâ âLow Securityâ entitlements by purchasing
an additional 322â2755 GL of âLow Securityâ, or 160â511 GL of âHigh Securityâ entitlements. Securing reliable
environmental water is a global problem. Finance economics present opportunities for increasing the reliability of
environmental flows
Modelling credit spreads with time volatility, skewness, and kurtosis
This paper seeks to identify the macroeconomic and financial factors that drive credit spreads on bond indices in the US credit market. To overcome the idiosyncratic nature of credit spread data reflected in time varying volatility, skewness and thick tails, it proposes asymmetric GARCH models with alternative probability density functions. The results show that credit spread changes are mainly explained by the interest rate and interest rate volatility, the slope of the yield curve, stock market returns and volatility, the state of liquidity in the corporate bond market and, a heretofore overlooked variable, the foreign exchange rate. They also confirm that the asymmetric GARCH models and Student-t distributions are systematically superior to the conventional GARCH model and the normal distribution in in-sample and out-of-sample testing
Test of lepton universality in decays
The first simultaneous test of muon-electron universality using
and decays is performed, in two ranges of the dilepton
invariant-mass squared, . The analysis uses beauty mesons produced in
proton-proton collisions collected with the LHCb detector between 2011 and
2018, corresponding to an integrated luminosity of 9 . Each
of the four lepton universality measurements reported is either the first in
the given interval or supersedes previous LHCb measurements. The
results are compatible with the predictions of the Standard Model.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-046.html (LHCb
public pages
Precision measurement of violation in the penguin-mediated decay
A flavor-tagged time-dependent angular analysis of the decay
is performed using collision data collected
by the LHCb experiment at % at TeV, the center-of-mass energy of
13 TeV, corresponding to an integrated luminosity of 6 fb^{-1}. The
-violating phase and direct -violation parameter are measured
to be rad and
, respectively, assuming the same values
for all polarization states of the system. In these results, the
first uncertainties are statistical and the second systematic. These parameters
are also determined separately for each polarization state, showing no evidence
for polarization dependence. The results are combined with previous LHCb
measurements using collisions at center-of-mass energies of 7 and 8 TeV,
yielding rad and . This is the most precise study of time-dependent violation
in a penguin-dominated meson decay. The results are consistent with
symmetry and with the Standard Model predictions.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-001.html (LHCb
public pages
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