Новые поступления электронной библиотеки
Содержатся материалы II Международной научно-практической конференции по следующим направлениям: автоматизация технологических процессов обработки материалов; технические и программные средства автоматизации; металлорежущие станки и инструменты; современные материалы в машиностроении.
Для специалистов в области машиностроения.
2025-11-06
The full CMS and ATLAS Run 2 datasets with time-integrated luminosity of 137 and 139
fb−1
in the diboson channels are used to probe benchmark models with extended gauge
sectors such as left-right symmetric (LR) and the sequential standard model (extended
gauge model, EGM), that predict the existence of neutral Z0
- and charged W0
- bosons
decaying to a pair of bosons ZH and WH in the semileptonic final state. These benchmark
models are used to interpret the results. Exclusion limits at the 95% C.L. on the Z
0 and W0
resonance production cross section times branching ratio to electroweak gauge boson pairs
in the resonance mass range between 1.0 and 5 TeV are here converted to constraints on Z-Z0
and W-W0 mixing parameters and masses. We present exclusion regions on the parameter
spaces of the Z
0 and W0 and show that the obtained exclusion regions are significantly
extended compared to those derived from the previous analysis performed with Tevatron
data as well as with the CMS and ATLAS data collected at 7 and 8 TeV in Run 1. The
reported limits are the most restrictive to date.
2025-11-05
Способ соединения сельскохозяйственных машин и орудий с трактором зависит от их
конструкции, назначения и способа агрегатирования. Тяговое сопротивление навесного
оборудования определяет общую производительность трактора, а также нагруженность
элементов механизма навески. В статье определены тяговые усилия при работе пахотного
агрегата на различных почвах.
2025-11-05
Настоящая статья посвящена анализу эволюции инженерной графики – от чертежей
на бумаге до современных технологий, включающих цифровое моделирование, искусственный интеллект (ИИ) и виртуальную реальность. Рассмотрены перспективы развития технологий цифровых двойников, BIM и автоматизированных систем проектирования с применением ИИ. Особое внимание уделено влиянию новых технологий на проектирование,
строительство и управление инженерными системами.
2025-11-05
A framework based on the rainbow approximation to the Dyson–Schwinger and Bethe–Salpeter equations with effective parameters adjusted to lattice data is suggested to calculate
the masses of the ground and excited states of mesons and pseudo-scalar glueballs as QCD
bound states of quarks and gluons. The structure of the truncated Bethe–Salpeter equation
with the gluon and ghost propagators as solutions of the truncated Dyson–Schwinger
equations is analysed in the Landau gauge. Both the Bete–Salpeter and Dyson–Schwinger
equations are solved numerically within the same rainbow-ladder truncation with the same
effective parameters which ensure consistency of the approach. We found that with a set
of parameters, which provides a good description of the lattice data within the Dyson–Schwinger approach, the solutions of the Bethe–Salpeter equation for mesons and pseudoscalar glueballs exhibit a rich mass spectrum that also includes the ground and excited
states predicted by the lattice calculations. The obtained mass spectrum contains also several
intermediate excitations unexpected within the lattice approaches.
2025-11-05
The explicit form of the sixth order radiative corrections to the lepton 𝐿
(𝐿=𝑒
, 𝜇
, and 𝜏
) anomalous magnetic moment from QED Feynman diagrams with insertion of the fourth order polarization operators consisting of either two closed lepton loops or one lepton loop crossed by a photon line is discussed in detail. The approach is based on the consistent application of dispersion relations for vacuum polarization operators and the Mellin-Barnes transform for massive photon propagators. Explicit analytical expressions for corrections to the lepton anomaly are obtained for the first time in the whole interval 0 <𝑟 <∞
of the ratio 𝑟
of lepton masses 𝑚ℓ/𝑚𝐿
. Asymptotic expansions in the limit of both small 𝑟 ≪1
and large 𝑟 ≫1
computed from the exact expressions are found to be in perfect agreement with the ones earlier reported in the literature. We argue that in the region where the physical lepton mass ratios are located, the asymptotic expansions hold with an accuracy higher than the experimentally measured anomalies. The two loop diagrams with all three leptons different from each other are computed numerically and compared with the corresponding corrections from the pure two-bubble and one-bubble mixed diagrams. It is shown that there are regions of ratios 𝑟
where all three types of the fourth order polarization operator contribute equally to the anomaly.
2025-11-05
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