389 research outputs found
Mechanical Properties of Thermoplastic Variable-Angle Composite Laminations for Conical Shells
Thermoplastic composite automated fiber placement
technology, as one of the extreme manufacturing
technologies for large or extra large
composite components with complex surface
shapes, has been widely used in the field of
aerospace vehicles. This paper takes 8 lamination
groups with different initial placement angles
generated by the conical shell variable
angle placement algorithm as research objects.
Variable angle placement algorithm for conical
shell and finite element model establishment
method for thermoplastic composite laminations
of variable angle with different initial
placement angles are presented. Static, modal
and buckling analyses are conducted for each
group. The results show that stress-strain relation,
modal and buckling strength of
variable-angle laminations vary regularly with
the initial placement angle.Π’Π΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΊΠ»Π°Π΄ΠΊΠΈ ΡΠ΅ΡΠΌΠΎΠΏΠ»Π°ΡΡΠΈΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΠΎΠ³ΠΎ Π²ΠΎΠ»ΠΎΠΊΠ½Π°, ΡΠ²Π»ΡΡΡΠ°ΡΡΡ
ΠΎΠ΄Π½ΠΎΠΉ ΠΈΠ· ΡΠ°Π΄ΠΈΠΊΠ°Π»ΡΠ½ΡΡ
ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ Π±ΠΎΠ»ΡΡΠΈΡ
ΠΈΠ»ΠΈ ΠΎΡΠ΅Π½Ρ Π±ΠΎΠ»ΡΡΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠΎΠ² ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΎΠ² Ρ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΠΌΠΈ ΡΠΎΡΠΌΠ°ΠΌΠΈ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ, ΡΠΈΡΠΎΠΊΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ Π² Π°Π²ΠΈΠ°ΡΠΈΠΎΠ½Π½ΠΎ-ΠΊΠΎΡΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΠΎΡΡΠΈ. Π ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΎΠ±ΡΠ΅ΠΊΡΠΎΠ² ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π»ΠΈ Π²ΠΎΡΠ΅ΠΌΡ Π³ΡΡΠΏΠΏ ΡΠ»ΠΎΠΈΡΡΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌΠΈ ΡΠ³Π»Π°ΠΌΠΈ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΠ°Π·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ, ΠΊΠΎΡΠΎΡΡΠ΅ Π±ΡΠ»ΠΈ ΡΠΎΠ·Π΄Π°Π½Ρ Ρ
ΠΏΠΎΠΌΠΎΡΡΡ Π°Π»Π³ΠΎΡΠΈΡΠΌΠ° ΡΠ°Π·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΠ΅ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠ³Π»Π° ΠΊΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠ±ΠΎΠ»ΠΎΡΠΊΠΈ. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ Π°Π»Π³ΠΎΡΠΈΡΠΌ ΡΠ°Π·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΠ΅ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠ³Π»Π° Π΄Π»Ρ ΠΊΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠ±ΠΎΠ»ΠΎΡΠΊΠΈ ΠΈ ΠΌΠΎΠ΄Π΅Π»Ρ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΌΠ΅ΡΠΎΠ΄Π°
ΠΊΠΎΠ½Π΅ΡΠ½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² Π΄Π»Ρ ΡΠ΅ΡΠΌΠΎΠΏΠ»Π°ΡΡΠΈΡΠ½ΡΡ
ΡΠ»ΠΎΠΈΡΡΡΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΎΠ² Ρ ΠΏΠ΅ΡΠ΅ΠΌΠ΅Π½Π½ΡΠΌ ΡΠ³Π»ΠΎΠΌ. ΠΠ»Ρ
ΠΊΠ°ΠΆΠ΄ΠΎΠΉ Π³ΡΡΠΏΠΏΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ·, ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠ°Π·Π»ΠΎΠΆΠ΅Π½ΠΈΡ ΠΏΠΎ ΡΠΎΠ±ΡΡΠ²Π΅Π½Π½ΡΠΌ ΡΠΎΡΠΌΠ°ΠΌ ΠΈ ΡΠ°ΡΡΠ΅Ρ ΡΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΠΈ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΡ
Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΠ΅βΠ΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΡ, ΠΌΠΎΠ΄Π°Π»ΡΠ½Π°Ρ ΠΏΡΠΎΡΠ½ΠΎΡΡΡ ΠΈ ΠΏΡΠΎΡΠ½ΠΎΡΡΡ ΠΏΡΠΈ ΠΏΡΠΎΠ΄ΠΎΠ»ΡΠ½ΠΎΠΌ ΠΈΠ·Π³ΠΈΠ±Π΅ ΡΠ»ΠΎΠΈΡΡΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Ρ ΠΏΠ΅ΡΠ΅ΠΌΠ΅Π½Π½ΡΠΌ ΡΠ³Π»ΠΎΠΌ ΠΏΠ΅ΡΠΈΠΎΠ΄ΠΈΡΠ΅ΡΠΊΠΈ ΠΈΠ·ΠΌΠ΅Π½ΡΡΡΡΡ Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΡΠ³Π»Π° ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΠ°Π·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ.Π’Π΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΡ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΡΠ½ΠΎΠ³ΠΎ ΡΠΊΠ»Π°Π΄Π°Π½Π½Ρ ΡΠ΅ΡΠΌΠΎΠΏΠ»Π°ΡΡΠΈΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΠΎΠ³ΠΎ Π²ΠΎΠ»ΠΎΠΊΠ½Π°, ΡΠΎ Ρ
ΠΎΠ΄Π½ΡΡΡ Π· ΡΠ°Π΄ΠΈΠΊΠ°Π»ΡΠ½ΠΈΡ
ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΠΉ ΠΎΡΡΠΈΠΌΠ°Π½Π½Ρ Π²Π΅Π»ΠΈΠΊΠΈΡ
Π°Π±ΠΎ Π΄ΡΠΆΠ΅ Π²Π΅Π»ΠΈΠΊΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΡΠ²
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡΠ² ΡΠ· ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΈΠΌΠΈ ΡΠΎΡΠΌΠ°ΠΌΠΈ ΠΏΠΎΠ²Π΅ΡΡ
Π½Ρ, ΡΠΈΡΠΎΠΊΠΎ Π²ΠΈΠΊΠΎΡΠΈΡΡΠΎΠ²ΡΡΡΡΡΡ Π² Π°Π²ΡΠ°ΡΡΠΉΠ½ΠΎ-ΠΊΠΎΡΠΌΡΡΠ½ΡΠΉ ΠΏΡΠΎΠΌΠΈΡΠ»ΠΎΠ²ΠΎΡΡΡ. ΠΠ±βΡΠΊΡΠΎΠΌ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ ΡΠ»ΡΠ³ΡΠ²Π°Π»ΠΈ Π²ΡΡΡΠΌ Π³ΡΡΠΏ ΡΠ°ΡΡΠ²Π°ΡΠΈΡ
ΠΌΠ°ΡΠ΅ΡΡΠ°Π»ΡΠ² ΡΠ· ΡΡΠ·Π½ΠΈΠΌΠΈ ΠΊΡΡΠ°ΠΌΠΈ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΠΎΠ·ΠΌΡΡΠ΅Π½Π½Ρ, ΡΠΊΡ ΠΎΡΡΠΈΠΌΠ°Π½ΠΎ Π·Π° Π΄ΠΎΠΏΠΎΠΌΠΎΠ³ΠΎΡ Π°Π»Π³ΠΎΡΠΈΡΠΌΠ° ΡΠΎΠ·ΠΌΡΡΠ΅Π½Π½Ρ Π·ΠΌΡΠ½Π½ΠΎΠ³ΠΎ ΠΊΡΡΠ° ΠΊΠΎΠ½ΡΡΠ½ΠΎΡ ΠΎΠ±ΠΎΠ»ΠΎΠ½ΠΊΠΈ. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΎ Π°Π»Π³ΠΎΡΠΈΡΠΌ
ΡΠΎΠ·ΠΌΡΡΠ΅Π½Π½Ρ Π·ΠΌΡΠ½Π½ΠΎΠ³ΠΎ ΠΊΡΡΠ° Π΄Π»Ρ ΠΊΠΎΠ½ΡΡΠ½ΠΎΡ ΠΎΠ±ΠΎΠ»ΠΎΠ½ΠΊΠΈ Ρ ΠΌΠΎΠ΄Π΅Π»Ρ Π½Π° ΠΎΡΠ½ΠΎΠ²Ρ ΠΌΠ΅ΡΠΎΠ΄Ρ ΡΠΊΡΠ½ΡΠ΅Π½Π½ΠΈΡ
Π΅Π»Π΅ΠΌΠ΅Π½ΡΡΠ² Π΄Π»Ρ ΡΠ΅ΡΠΌΠΎΠΏΠ»Π°ΡΡΠΈΡΠ½ΠΈΡ
ΡΠ°ΡΡΠ²Π°ΡΠΈΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΡΠ² Π·Ρ Π·ΠΌΡΠ½Π½ΠΈΠΌ ΠΊΡΡΠΎΠΌ. ΠΠ»Ρ
ΠΊΠΎΠΆΠ½ΠΎΡ Π³ΡΡΠΏΠΈ ΠΌΠ°ΡΠ΅ΡΡΠ°Π»ΡΠ² ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ½ΠΈΠΉ Π°Π½Π°Π»ΡΠ·, Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠΎΠ·ΠΊΠ»Π°Π΄Π°Π½Π½Ρ Π·Π° Π²Π»Π°ΡΠ½ΠΈΠΌΠΈ ΡΠΎΡΠΌΠ°ΠΌΠΈ Ρ ΡΠΎΠ·ΡΠ°Ρ
ΡΠ½ΠΎΠΊ ΡΡΡΠΉΠΊΠΎΡΡΡ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΠΎ Π·Π°Π»Π΅ΠΆΠ½ΡΡΡΡ
Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΡβΠ΄Π΅ΡΠΎΡΠΌΠ°ΡΡΡ, ΠΌΠΎΠ΄Π°Π»ΡΠ½Π° ΠΌΡΡΠ½ΡΡΡΡ Ρ ΠΌΡΡΠ½ΡΡΡΡ ΠΏΡΠΈ ΠΏΠΎΠ·Π΄ΠΎΠ²ΠΆΠ½ΡΠΎΠΌΡ Π·Π³ΠΈΠ½Ρ ΡΠ°ΡΡΠ²Π°ΡΠΈΡ
ΠΌΠ°ΡΠ΅ΡΡΠ°Π»ΡΠ² Π·Ρ Π·ΠΌΡΠ½Π½ΠΈΠΌ ΠΊΡΡΠΎΠΌ ΠΏΠ΅ΡΡΠΎΠ΄ΠΈΡΠ½ΠΎ Π·ΠΌΡΠ½ΡΡΡΡΡΡ Π² Π·Π°Π»Π΅ΠΆΠ½ΠΎΡΡΡ Π²ΡΠ΄ ΠΊΡΡΠ° ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΠΎΠ·ΠΌΡΡΠ΅Π½Π½Ρ
Coupled superconducting qudit-resonator system: Energy spectrum, state population, and state transition under microwave drive
Superconducting quantum multilevel systems coupled to resonators have recently been considered in some
applications such as microwave lasing and high-fidelity quantum logical gates. In this work, using an rf-SQUID
type phase qudit coupled to a microwave coplanar waveguide resonator, we study both theoretically and
experimentally the energy spectrum of the system when the qudit level spacings are varied around the resonator
frequency by changing the magnetic flux applied to the qudit loop. We show that the experimental result can
be well described by a theoretical model that extends from the usual two-level Jaynes-Cummings system to the
present four-level system. It is also shown that due to the small anharmonicity of the phase device a simplified
model capturing the leading state interactions fits the experimental spectra very well. Furthermore we use the
Lindblad master equation containing various relaxation and dephasing processes to calculate the level populations
in the simpler qutrit-resonator system, which allows a clear understanding of the dynamics of the system under
the microwave drive. Our results help to better understand and perform the experiments of coupled multilevel
and resonator systems and can be applied in the case of transmon or Xmon qudits having similar anharmonicity
to the present phase device.This work was supported by the Ministry of Science and Technology of China (Grants No. 2014CB921202, No. 2015CB921104, and No. 2016YFA0300601),the National Natural Science Foundation of China (Grants No. 91321208 and No. 11674380)the Key Research Program of the Chinese Academy of Sciences (Grant No. XDPB08-3)S.H. acknowledges support by the US NSF (PHY-1314861)
Effects of different probiotics on the gut microbiome and metabolites in the serum and caecum of weaning piglets
The objective of the study was to determine the effects of antibiotics, yeast culture (YC), and Lactobacillus culture (LC) on the gut microbiome and metabolites in the serum and caecum of weaning piglets. Twenty-four weaning piglets were divided into four treatment groups: control, antibiotic (1% chlortetracycline), 1.8% yeast culture (YC), and 1.6% Lactobacillus culture groups (LC). Each group had six replicated pens with one pig per pen. Feed and water were available ad libitum. Dietary supplementation with antibiotics, YC and LC increased the abundance of phylum, Firmicutes, and decreased the abundance of phylum, Proteobacteria. Beneficial bacteria such as Lactobacillus and Megasphaera in YC and LC groups increased, whereas the proportion of Shigella was decreased. Genera Alloprevotella and Lachnospira were biomarkers in the control and antibiotic groups, respectively. Phylum, Bacteroidetes, and genus, Collinsella, were biomarkers in the YC group, and Mitsuokella, Anaerotruncus, Syntrophococcus and Sharpea were biomarkers in the LC group. Dietary supplementation with different probiotics changed the serum and caecum metabolite profiles too. Antibiotic supplementation increased the levels of D-mannose, D-glucose, and hexadecanoic acid in the serum, and the levels of myo-inositol, D-mannose and benzenepropanoic acid in the caecum. LC increased the concentrations of D-mannose, cis-9-hexadecenoic acid and heptadecanoic acid in caecum compared with the control group. YC and LC supplementation in the weaning diet could improve the abundance of beneficial bacteria by changing the concentrations of some metabolites in the serum and caecum. Therefore, dietary supplementation with YC or LC could be used as additives instead of antibiotics in weaning piglets.Keywords: antibiotic; lactobacillus culture; yeast culture; high-throughput sequencing; gas chromatography mass spectrometr
Measurement and calculation of neutron leakage spectra from slab samples of beryllium, gallium and tungsten irradiated with 14.8 MeV neutrons
Brachypodium distachyon line Bd3-1 resistance is elicited by the barley stripe mosaic virus triple gene block 1 movement protein
Barley stripe mosaic virus North Dakota 18 (ND18), Beijing (BJ), Xinjiang (Xi), Type (TY) and CV21 strains are unable to infect the Brachypodium distachyon Bd3-1 inbred line, which harbours a resistance gene designated Bsr1, but the Norwich (NW) strain is virulent on Bd3-1. Analysis of ND18 and NW genomic RNA reassortants and RNA beta mutants demonstrates that two amino acids within the helicase motif of the triple gene block 1 (TGB1) movement protein have major effects on their Bd3-1 phenotypes. Resistance to ND18 correlates with an arginine residue at TGB1 position 390 (R-390) and a threonine at position 392 (T-392), whereas the virulent NW strain contains lysines (K) at both positions. ND18 TGB1 R390K ((ND)TGB1(R390K)) and (ND)TGB1(T392K) single substitutions, and an (ND)TGB1(R390K,T392K) double mutation resulted in systemic infections of Bd3-1. Reciprocal (ND)TGB1 substitutions into (NW)TGB1 ((NW)TGB1(K390R) and (NW)TGB1(K392T)) failed to affect virulence, implying that K-390 and K-392 compensate for each other. In contrast, an (NW)TGB1(K390R,K392T) double mutant exhibited limited vascular movement in Bd3-1, but developed prominent necrotic streaks that spread from secondary leaf veins. This phenotype, combined with the appearance of necrotic spots in certain ND18 mutants, and necrosis and rapid wilting of Bd3-1 plants after BJ strain ((BJ)TGB1(K390,T392)) inoculations, show that Bd3-1 Bsr1 resistance is elicited by the TGB1 protein and suggest that it involves a hypersensitive response
Partial Wave Analysis of
BES data on are presented. The
contribution peaks strongly near threshold. It is fitted with a
broad resonance with mass MeV, width MeV. A broad resonance peaking at 2020 MeV is also required
with width MeV. There is further evidence for a component
peaking at 2.55 GeV. The non- contribution is close to phase
space; it peaks at 2.6 GeV and is very different from .Comment: 15 pages, 6 figures, 1 table, Submitted to PL
A Measurement of Psi(2S) Resonance Parameters
Cross sections for e+e- to hadons, pi+pi- J/Psi, and mu+mu- have been
measured in the vicinity of the Psi(2S) resonance using the BESII detector
operated at the BEPC. The Psi(2S) total width; partial widths to hadrons,
pi+pi- J/Psi, muons; and corresponding branching fractions have been determined
to be Gamma(total)= (264+-27) keV; Gamma(hadron)= (258+-26) keV, Gamma(mu)=
(2.44+-0.21) keV, and Gamma(pi+pi- J/Psi)= (85+-8.7) keV; and Br(hadron)=
(97.79+-0.15)%, Br(pi+pi- J/Psi)= (32+-1.4)%, Br(mu)= (0.93+-0.08)%,
respectively.Comment: 8 pages, 6 figure
Measurements of the Mass and Full-Width of the Meson
In a sample of 58 million events collected with the BES II detector,
the process J/ is observed in five different decay
channels: , , (with ), (with
) and . From a combined fit of all five
channels, we determine the mass and full-width of to be
MeV/ and
MeV/.Comment: 9 pages, 2 figures and 4 table. Submitted to Phys. Lett.
- β¦