408 research outputs found
Implementation of low-loss superinductances for quantum circuits
The simultaneous suppression of charge fluctuations and offsets is crucial
for preserving quantum coherence in devices exploiting large quantum
fluctuations of the superconducting phase. This requires an environment with
both extremely low DC and high RF impedance. Such an environment is provided by
a superinductance, defined as a zero DC resistance inductance whose impedance
exceeds the resistance quantum at
frequencies of interest (1 - 10 GHz). In addition, the superinductance must
have as little dissipation as possible, and possess a self-resonant frequency
well above frequencies of interest. The kinetic inductance of an array of
Josephson junctions is an ideal candidate to implement the superinductance
provided its phase slip rate is sufficiently low. We successfully implemented
such an array using large Josephson junctions (), and measured
internal losses less than 20 ppm, self-resonant frequencies greater than 10
GHz, and phase slip rates less than 1 mHz
Self-esteem and depression in adolescents
PURPOSE. The article looks at self-esteem and depression during adolescence. It is a theoretical study of the relationship between depression and self-esteem. There are types of self-esteem, self-esteem by gender and age. The theories of depression in adolescence, as well as the factors leading to depression, are examined. Several scales for assessing depression are presented. In view of the application of the main features of self-esteem and depression, their intersections in practical context are examined
Planar multilayer circuit quantum electrodynamics
Experimental quantum information processing with superconducting circuits is
rapidly advancing, driven by innovation in two classes of devices, one
involving planar micro-fabricated (2D) resonators, and the other involving
machined three-dimensional (3D) cavities. We demonstrate that circuit quantum
electrodynamics can be implemented in a multilayer superconducting structure
that combines 2D and 3D advantages. We employ standard micro-fabrication
techniques to pattern each layer, and rely on a vacuum gap between the layers
to store the electromagnetic energy. Planar qubits are lithographically defined
as an aperture in a conducting boundary of the resonators. We demonstrate the
aperture concept by implementing an integrated, two cavity-modes, one
transmon-qubit system
Effect of foliar products on the inflorescence yield of lavender and essential oil
Received: January 25th, 2022 ; Accepted: May 1st, 2022 ; Published: May 23rd, 2022 ;
Correspondence: [email protected] topic of the effect of foliar fertilization on the productivity and oil content of
lavender is relevant, but not sufficiently studied. The present study aims to establish the effect of
foliar products on the growth, development and productivity of lavender. The field experiment
was carried out at the Agricultural University - Plovdiv with lavender of ‘Jubileina’ variety during
2019–2020. The following variants were included in the study: 1. Untreated control; 2. Treatment
with Fertileader Gold (FG) - 3 L ha-1; 3. Treatment with Fertiactyl Trium + Fertileader Vital
(FT + FVital) - 1.5 + 1.5 L ha-1; 4. Treatment with Fertileader Viti (FViti) - 3 L ha-1; 5. Treatment
with Fertileader Vital (FV) - 3 L ha-1; 6. Treatment with Fertileader Alpha (FA) - 3 L ha-1. Those
preparations are bio stimulants for foliar application. The treatments were made in two
consecutive lavender vegetation seasons. The first application was carried out in the second
growing season (2019) and the second in the next, third growing season (2020). The foliar
application of all tested products increased the photosynthetic activity, but it was better expressed
when using the plant nutrition products FV, FViti and FT + FVital. A positive effect was also
observed in the height and diameter of the bush, but during the third vegetation period. The
number of flowering stems increased by 62.9%; 59.4%; 53.3% and 8.4%, respectively, when
applying the fertilizers FG, FT + FVital, FViti and FV. The application of FG and FT + FVital
increased the yield of fresh inflorescences by 6.1% and 3.7%. The application of the different
products affected the oil yield in different ways; the application of FG, FT + FVital and FViti
increased it, while FV and FA decreased it by 27 kg ha-1 and 16 kg ha-1, respectively, for the first
vegetation and by 43.4 kg ha-1and 33.1 kg ha-1 for the second vegetation. The boron containing
products FG, FT + FVital and FViti led to a significant increase in the essential oil yield, while
the application of the foliar fertilizers FV and FA reduced it. Based on those results, the first three
products are recommended
Optical spectroscopy of Be stars: peak separation of Balmer emission lines
The Be stars display variable optical emission lines originating in the
circumstellar disc. Here we analyse high resolution spectroscopic observations
of Be stars and the distance between the peaks of H-alpha, H-beta, and H-gamma
emission lines (, , and
respectively). Combining published data, spectra from the ELODIE archive
(obtained in the period 1998 -- 2003) and Rozhen spectra (obtained 2015 --
2023) of 93 Be stars, we find a set of relations connecting ,
and . They are effective for km s, km s, and
km s. The new equations are in the form
and are valid for a wider velocity range than in previous studies.Comment: Astronomische Nachrichten (accepted
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