336 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
Transpolar arc observation after solar wind entry into the high-latitude magnetosphere
Recently, Cluster observations have revealed the presence of new regions of solar wind plasma entry at the high-latitude magnetospheric lobes tailward of the cusp region, mostly during periods of northward interplanetary magnetic field. In this study, observations from the Global Ultraviolet Imager (GUVI) experiment on board the TIMED spacecraft and Wideband Imaging Camera imager on board the IMAGE satellite are used to investigate a possible link between solar wind entry and the formation of transpolar arcs in the polar cap. We focus on a case when transpolar arc formation was observed twice right after the two solar wind entry events were detected by the Cluster spacecraft. In addition, GUVI and IMAGE observations show a simultaneous occurrence of auroral activity at low and high latitudes after the second entry event, possibly indicating a two-part structure of the continuous band of the transpolar arc
Quiet in class: classification, noise and the dendritic cell algorithm
Theoretical analyses of the Dendritic Cell Algorithm (DCA) have yielded several criticisms about its underlying structure and operation. As a result, several alterations and fixes have been suggested in the literature to correct for these findings. A contribution of this work is to investigate the effects of replacing the classification stage of the DCA (which is known to be flawed) with a traditional machine learning technique. This work goes on to question the merits of those unique properties of the DCA that are yet to be thoroughly analysed. If none of these properties can be found to have a benefit over traditional approaches, then βfixingβ the DCA is arguably less efficient than simply creating a new algorithm. This work examines the dynamic filtering property of the DCA and questions the utility of this unique feature for the anomaly detection problem. It is found that this feature, while advantageous for noisy, time-ordered classification, is not as useful as a traditional static filter for processing a synthetic dataset. It is concluded that there are still unique features of the DCA left to investigate. Areas that may be of benefit to the Artificial Immune Systems community are suggested
Observation of Two New N* Peaks in J/psi -> and Decays
The system in decays of is limited to be
isospin 1/2 by isospin conservation. This provides a big advantage in studying
compared with and experiments which mix
isospin 1/2 and 3/2 for the system. Using 58 million decays
collected with the Beijing Electron Positron Collider, more than 100 thousand
events are obtained. Besides two well known
peaks at 1500 MeV and 1670 MeV, there are two new, clear peaks in
the invariant mass spectrum around 1360 MeV and 2030 MeV. They are the
first direct observation of the peak and a long-sought "missing"
peak above 2 GeV in the invariant mass spectrum. A simple
Breit-Wigner fit gives the mass and width for the peak as MeV and MeV, and for the new peak above 2 GeV
as MeV and MeV, respectively
Solar wind pressure pulseβdriven magnetospheric vortices and their global consequences
We report the in situ observation of a plasma vortex induced by a solar wind dynamic pressure enhancement in the nightside plasma sheet using multipoint measurements from Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites. The vortex has a scale of 5β10 Re and propagates several Re downtail, expanding while propagating. The features of the vortex are consistent with the prediction of the Sibeck (1990) model, and the vortex can penetrate deep (~8 Re ) in the dawnβdusk direction and couple to field line oscillations. Global magnetohydrodynamics simulations are carried out, and it is found that the simulation and observations are consistent with each other. Data from THEMIS ground magnetometer stations indicate a poleward propagating vortex in the ionosphere, with a rotational sense consistent with the existence of the vortex observed in the magnetotail. Key Points Solar wind pressure pulseβdriven vortex was observed in the magnetosphere Simulation and ground magnetic field data confirm this tailward moving vortex The vortex can penetrate deep inside the tail plasma sheet and couple to FLRsPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/107999/1/jgra51112.pd
Search for Invisible Decays of and in and
Using a data sample of decays collected with the BES
II detector at the BEPC, searches for invisible decays of and
in to and are performed.
The signals, which are reconstructed in final states, are used
to tag the and decays. No signals are found for the
invisible decays of either or , and upper limits at the 90%
confidence level are determined to be for the ratio
and for . These are the first
searches for and decays into invisible final states.Comment: 5 pages, 4 figures; Added references, Corrected typo
Direct Measurements of the Branching Fractions for and and Determinations of the Form Factors and
The absolute branching fractions for the decays and
are determined using singly
tagged sample from the data collected around 3.773 GeV with the
BES-II detector at the BEPC. In the system recoiling against the singly tagged
meson, events for and events for decays are observed. Those yield
the absolute branching fractions to be and . The
vector form factors are determined to be
and . The ratio of the two form
factors is measured to be .Comment: 6 pages, 5 figure
Search for the Rare Decays J/Psi --> Ds- e+ nu_e, J/Psi --> D- e+ nu_e, and J/Psi --> D0bar e+ e-
We report on a search for the decays J/Psi --> Ds- e+ nu_e + c.c., J/Psi -->
D- e+ nu_e + c.c., and J/Psi --> D0bar e+ e- + c.c. in a sample of 5.8 * 10^7
J/Psi events collected with the BESII detector at the BEPC. No excess of signal
above background is observed, and 90% confidence level upper limits on the
branching fractions are set: B(J/Psi --> Ds- e+ nu_e + c.c.)<4.8*10^-5, B(J/Psi
--> D- e+ nu_e + c.c.) D0bar e+ e- + c.c.)<1.1*10^-5Comment: 10 pages, 4 figure
Measurements of J/psi Decays into 2(pi+pi-)eta and 3(pi+pi-)eta
Based on a sample of 5.8X 10^7 J/psi events taken with the BESII detector,
the branching fractions of J/psi--> 2(pi+pi-)eta and J/psi-->3(pi+pi-)eta are
measured for the first time to be (2.26+-0.08+-0.27)X10^{-3} and
(7.24+-0.96+-1.11)X10^{-4}, respectively.Comment: 11 pages, 6 figure
BESII Detector Simulation
A Monte Carlo program based on Geant3 has been developed for BESII detector
simulation. The organization of the program is outlined, and the digitization
procedure for simulating the response of various sub-detectors is described.
Comparisons with data show that the performance of the program is generally
satisfactory.Comment: 17 pages, 14 figures, uses elsart.cls, to be submitted to NIM
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