3,086 research outputs found
Różne aspekty ograniczenia wydajności pompy wyporowej o stałej objętości jednostkowej
A solution of reduction of the oil flow rate of a positive displacement pump has
been discussed. Theoretical basis, description and test results concerning each of variants are
presented. Influence of some technical parameters on the set point of the flow rate threshold is
discussed
Różne aspekty ograniczenia wydajności pompy wyporowej o stałej objętości jednostkowej
Artykuł zamieszczony w : „Problemy rozwoju maszyn roboczych” XXVIII Konferencja Naukowa Zakopane 2015 (Materiały konferencyjne wydane w serii Monografie PŁ)A solution has been proposed that ensures oil drain from the discharge chamber to the pump inlet. The piston of a relief valve is controlled by a differential pressure resulting from Bernouilli effect. The start value of oil draining is to be controlled by the spring initial deflection and modification of the flow section in the outlet channel of the pump. By diminishing the spring force, 30% reduction of the flow rate has been achieved. It is difficult to get more because of stability reasons. A more effective method is to decrease the local flow section where a static pressure probe is placed. This way 36% reduction has been achieved and there is no reason to not to go further
On the symmetry of the seminal Horodecki state
It is shown that the seminal Horodecki 2-qutrit state belongs to the class of
states displaying symmetry governed by a commutative subgroup of the unitary
group U(3). Taking a conjugate subgroup one obtains another classes of
symmetric states and one finds equivalent representations of the Horodecki
state.Comment: 7 page
Violation of Clauser-Horne-Shimony-Holt inequality for states resulting from entanglement swapping
We consider violation of CHSH inequality for states before and after
entanglement swapping. We present a pair of initial states which do not violate
CHSH inequality however the final state violates CHSH inequality for some
results of Bell measurements performed in order to swap entanglement.Comment: 3 pages, 2 figure
Constraining the near-core rotation of the gamma Doradus star 43 Cygni using BRITE-Constellation data
Photometric time series of the Dor star 43 Cyg obtained with the
BRITE-Constellation nano-satellites allow us to study its pulsational
properties in detail and to constrain its interior structure. We aim to find a
g-mode period spacing pattern that allows us to determine the near-core
rotation rate of 43 Cyg and redetermine the star's fundamental atmospheric
parameters and chemical composition. We conducted a frequency analysis using
the 156-days long data set obtained with the BRITE-Toronto satellite and
employed a suite of MESA/GYRE models to derive the mode identification,
asymptotic period spacing and near-core rotation rate. We also used
high-resolution, high signal-to-noise ratio spectroscopic data obtained at the
1.2m Mercator telescope with the HERMES spectrograph to redetermine the
fundamental atmospheric parameters and chemical composition of 43 Cyg using the
software Spectroscopy Made Easy (SME). We detected 43 intrinsic pulsation
frequencies and identified 18 of them to be part of a period spacing pattern
consisting of prograde dipole modes with an asymptotic period spacing of . The near-core rotation rate was
determined to be . The
atmosphere of 43 Cyg shows solar chemical composition at an effective
temperature of 7150 150 K, a log g of 4.2 0.6 dex and a projected
rotational velocity, , of 44 4 kms. The morphology
of the observed period spacing patterns shows indications of the presence of a
significant chemical gradient in the stellar interior.Comment: 9 pages, 8 figures, accepted by A&
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