301 research outputs found
Design and Assembly of a Large-aperture Nb3Sn Cos-theta Dipole Coil with Stress Management in Dipole Mirror Configuration
The stress-management cos-theta (SMCT) coil is a new concept which has been
proposed and is being developed at Fermilab in the framework of US Magnet
Development Program (US-MDP) for high-field and/or large-aperture accelerator
magnets based on low-temperature and high-temperature superconductors. The SMCT
structure is used to reduce large coil deformations under the Lorentz forces
and, thus, the excessively large strains and stresses in the coil. A
large-aperture Nb3Sn SMCT dipole coil has been developed and fabricated at
Fermilab to demonstrate and test the SMCT concept including coil design,
fabrication technology and performance. The first SMCT coil has been assembled
with 60-mm aperture Nb3Sn coil inside a dipole mirror configuration and will be
tested separately and in series with the insert coil. This paper summarizes the
large-aperture SMCT coil design and parameters and reports the coil fabrication
steps and its assembly in dipole mirror configuration
Development and Test of a Large-aperture Nb3Sn Cos-theta Dipole Coil with Stress Management
The design concept of the Electron Ion Collider (EIC), which is under
construction at BNL, considers adding a 2nd Interaction Region (IR) and
detector to the machine after completion of the present EIC project. Recent
progress with development and fabrication of large-aperture high-field magnets
based on the Nb3Sn technology for the HL-LHC makes this technology interesting
for the 2nd EIC IR. This paper summarizes the results of feasibility studies of
large-aperture high-field Nb3Sn dipoles and quadrupoles for the 2nd EIC IR.Comment: IPAC 2023. arXiv admin note: text overlap with arXiv:2304.1315
Priming potato plants with melatonin protects stolon formation under delayed salt stress by maintaining the photochemical function of photosystem II, ionic homeostasis and activating the antioxidant system
Melatonin is among one of the promising agents able to protect agricultural plants from the adverse action of different stressors, including salinity. We aimed to investigate the effects of melatonin priming (0.1, 1.0 and 10 Β΅M) on salt-stressed potato plants (125 mM NaCl), by studying the growth parameters, photochemical activity of photosystem II, water status, ion content and antioxidant system activity. Melatonin as a pleiotropic signaling molecule was found to decrease the negative effect of salt stress on stolon formation, tissue water content and ion status without a significant effect on the expression of Na+/H+ -antiporter genes localized on the vacuolar (NHX1 to NHX3) and plasma membrane (SOS1). Melatonin effectively decreases the accumulation of lipid peroxidation products in potato leaves in the whole range of concentrations studied. A melatonin-induced dose-dependent increase in Fv/Fm together with a decrease in uncontrolled non-photochemical dissipation Y(NO) also indicates decreased oxidative damage. The observed protective ability of melatonin was unlikely due to its influence on antioxidant enzymes, since neither SOD nor peroxidase were activated by melatonin. Melatonin exerted positive effects on the accumulation of water-soluble low-molecularweight antioxidants, proline and flavonoids, which could aid in decreasing oxidative stress. The most consistent positive effect was observed on the accumulation of carotenoids, which are well-known lipophilic antioxidants playing an important role in the protection of photosynthesis from oxidative damage. Finally, it is possible that melatonin accumulated during pretreatment could exert direct antioxidative effects due to the ROS scavenging activity of melatonin molecules
ΠΠΠΠ―ΠΠΠ ΠΠΠΠΠΠΠ§ΠΠ‘ΠΠΠΠ ΠΠΠΠΠΠΠΠΠ§ΠΠΠΠΠΠ― ΠΠ ΠΠ€Π€ΠΠΠ’ΠΠΠΠΠ‘Π’Π¬ ΠΠΠΠΠ’Π ΠΠΠΠΠΠΠ’ΠΠ-ΠΠΠ£Π‘Π’ΠΠ§ΠΠ‘ΠΠΠΠ ΠΠ ΠΠΠΠ ΠΠΠΠΠΠΠΠ― ΠΠ Π ΠΠΠΠΠΠΠΠΠΠΠ ΠΠΠΠ’Π ΠΠΠ ΠΠ Π£Π’ΠΠΠ
The disadvantage of the electromagnetic-acoustic (EMA) method receiving ultrasonic waves are low efficiency. The traditional way to enhance its effectiveness is increase the bias field. The aim of the study was research the way to improve the efficiency of the EMA transformation, using a time-varying bias field.The researches held with the help of a specially designed installation that allows the magnetization to be performed by a constant and alternating magnetic field (dynamic bias), synchronously with the passage of the received pulse. The object of the study were rods made of different grades of steel with a diameter of 4β6 mm, in which the symmetrical zero mode S0 of the rod wave was excited by the EMA method (in the frequency range of about 40 kHz). A comparative analysis of the amplitudes and form pulses of multiple reflections during static and dynamic reversal of magnetization and with a full cycle of magnetization reversal conducted.The result of the efficiency measurements EMA reception during static and dynamic bias found a significant (up to 5 times) increase in the signal amplitude on the receiving transducer. Taking into account that the main contribution to the excitation mechanism and the reception mechanism made the magnetostrictive effect on low frecuncy, it can assumed that using a dynamic bias field is impacting significant on the effective mobility of magnetic domains (that is changes the dynamic magnetic susceptibility of the material). It is established that it is possible to monitor steel at lower values of the bias field, and, consequently, to reduce the mass dimensions of the magnetic system.Thus, in the course of the researchers found of effect of dynamic bias and effect of dynamic bias increase acoustic pulse amplitude of the signal of the received EMA method. Using this method will improve the quality EMA testing by creating more efficient EMA transducer. Taking into account that the value of the detected effect depends significantly on the steel grade, we can assume its possible application in the methods of express analysis, estimation of structural and stressed states.Β ΠΠ΅Π΄ΠΎΡΡΠ°ΡΠΊΠΎΠΌ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎ-Π°ΠΊΡΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ (ΠΠΠ) ΠΌΠ΅ΡΠΎΠ΄Π° ΠΏΡΠΈΠ΅ΠΌΠ° ΡΠ»ΡΡΡΠ°Π·Π²ΡΠΊΠΎΠ²ΡΡ
ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΠΉ ΡΠ²Π»ΡΠ΅ΡΡΡ Π΅Π³ΠΎ Π½ΠΈΠ·ΠΊΠ°Ρ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ. Π’ΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½ΡΠ΅ ΡΠΏΠΎΡΠΎΠ±Ρ Π΅Π΅ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ β ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ ΠΏΠΎΠ΄ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°ΡΡΠ΅Π³ΠΎ ΠΏΠΎΠ»Ρ. Π¦Π΅Π»ΡΡ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΡΠ²Π»ΡΠ»ΠΎΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠΏΠΎΡΠΎΠ±Π° ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΠΠ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΈΠ·ΠΌΠ΅Π½ΡΡΡΠ΅Π³ΠΎΡΡ Π²ΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ ΠΏΠΎΠ»Ρ ΠΏΠΎΠ΄ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΡ.Β ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΠΎ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠΉ ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠΈ, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠ΅ΠΉ ΠΎΡΡΡΠ΅ΡΡΠ²Π»ΡΡΡ ΠΏΠΎΠ΄ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΠ΅ ΠΏΠΎΡΡΠΎΡΠ½Π½ΡΠΌ ΠΈ ΠΏΠ΅ΡΠ΅ΠΌΠ΅Π½Π½ΡΠΌ ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΠΌ ΠΏΠΎΠ»Π΅ΠΌ (Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΏΠΎΠ΄ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΠ΅) ΡΠΈΠ½Ρ
ΡΠΎΠ½Π½ΠΎ Ρ ΠΏΡΠΎΡ
ΠΎΠΆΠ΄Π΅Π½ΠΈΠ΅ΠΌ ΠΏΡΠΈΠ½ΡΡΠΎΠ³ΠΎ ΠΈΠΌΠΏΡΠ»ΡΡΠ°. ΠΠ±ΡΠ΅ΠΊΡΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π»ΡΠ»ΠΈΡΡ ΠΏΡΡΡΠΊΠΈ ΠΈΠ· ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΌΠ°ΡΠΎΠΊ ΡΡΠ°Π»ΠΈ Π΄ΠΈΠ°ΠΌΠ΅ΡΡΠΎΠΌ 4β6 ΠΌΠΌ, Π² ΠΊΠΎΡΠΎΡΡΡ
ΠΠΠ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π²ΠΎΠ·Π±ΡΠΆΠ΄Π°Π»Π°ΡΡ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½Π°Ρ Π½ΡΠ»Π΅Π²Π°Ρ ΠΌΠΎΠ΄Π° S0 ΡΡΠ΅ΡΠΆΠ½Π΅Π²ΠΎΠΉ Π²ΠΎΠ»Π½Ρ (Π² ΡΠ°ΡΡΠΎΡΠ½ΠΎΠΌ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ ΠΎΠΊΠΎΠ»ΠΎ 40 ΠΊΠΡ). ΠΡΠΎΠ²Π΅Π΄Π΅Π½ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄ ΠΈ ΡΠΎΡΠΌ ΡΠ΅ΡΠΈΠΈ ΠΈΠΌΠΏΡΠ»ΡΡΠΎΠ² ΠΌΠ½ΠΎΠ³ΠΎΠΊΡΠ°ΡΠ½ΡΡ
ΠΎΡΡΠ°ΠΆΠ΅Π½ΠΈΠΉ ΠΏΡΠΈ ΡΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΏΠ΅ΡΠ΅ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΠΈ ΠΈ Ρ ΠΏΠΎΠ»Π½ΡΠΌ ΡΠΈΠΊΠ»ΠΎΠΌ ΠΏΠ΅ΡΠ΅ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΡ.Π ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΡΡ
ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΠΠ ΠΏΡΠΈΠ΅ΠΌΠ° ΠΏΡΠΈ ΡΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΏΠΎΠ΄ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΠΈ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ΅ (Π΄ΠΎ 5 ΡΠ°Π·) ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Ρ ΡΠΈΠ³Π½Π°Π»Π° Π½Π° ΠΏΡΠΈΠ΅ΠΌΠ½ΠΎΠΌ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»Π΅. Π ΡΠ²ΡΠ·ΠΈ Ρ ΡΠ΅ΠΌ, ΡΡΠΎ Π½Π° Π½ΠΈΠ·ΠΊΠΈΡ
ΡΠ°ΡΡΠΎΡΠ°Ρ
ΠΎΡΠ½ΠΎΠ²Π½ΠΎΠΉ Π²ΠΊΠ»Π°Π΄ Π² ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌ ΠΊΠ°ΠΊ Π²ΠΎΠ·Π±ΡΠΆΠ΄Π΅Π½ΠΈΡ, ΡΠ°ΠΊ ΠΈ ΠΏΡΠΈΠ΅ΠΌΠ° Π²Π½ΠΎΡΠΈΡ ΠΌΠ°Π³Π½ΠΈΡΠΎΡΡΡΠΈΠΊΡΠΈΠΎΠ½Π½ΡΠΉ ΡΡΡΠ΅ΠΊΡ, ΠΌΠΎΠΆΠ½ΠΎ ΠΏΡΠ΅Π΄ΠΏΠΎΠ»Π°Π³Π°ΡΡ, ΡΡΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ ΠΏΠΎΠ΄ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΡ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ Π²Π»ΠΈΡΠ΅Ρ Π½Π° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΡ ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΡΡΡ ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ
Π΄ΠΎΠΌΠ΅Π½ΠΎΠ² (Ρ.Π΅. ΠΈΠ·ΠΌΠ΅Π½ΡΠ΅Ρ Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΡΡ ΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ Π²ΠΎΡΠΏΡΠΈΠΈΠΌΡΠΈΠ²ΠΎΡΡΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°). Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΡΡ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ ΠΏΡΠΈ ΠΌΠ΅Π½ΡΡΠΈΡ
Π·Π½Π°ΡΠ΅Π½ΠΈΡΡ
ΠΏΠΎΠ΄ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°ΡΡΠ΅Π³ΠΎ ΠΏΠΎΠ»Ρ, Π° ΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΠΎ, ΡΠ½ΠΈΠ·ΠΈΡΡ ΠΌΠ°ΡΡΠΎΠ³Π°Π±Π°ΡΠΈΡΠ½ΡΠ΅ ΡΠ°Π·ΠΌΠ΅ΡΡ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ.Π’Π°ΠΊΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ, Π² Ρ
ΠΎΠ΄Π΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ Π½Π°Π»ΠΈΡΠΈΠ΅ ΠΈ ΠΏΡΠΎΠΈΠ·Π²Π΅Π΄Π΅Π½Π° ΠΎΡΠ΅Π½ΠΊΠ° Π²Π΅Π»ΠΈΡΠΈΠ½Ρ ΡΡΡΠ΅ΠΊΡΠ° Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΠΎΠ΄ΠΌΠ°Π³Π½ΠΈΡΠΈΠ²Π°Π½ΠΈΡ (ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Ρ ΡΠΈΠ³Π½Π°Π»Π° ΠΏΡΠΈΠ½ΡΡΠΎΠ³ΠΎ ΠΠΠ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π°ΠΊΡΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΠΌΠΏΡΠ»ΡΡΠ°). ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΡ ΠΏΠΎΠ²ΡΡΠΈΡΡ ΠΊΠ°ΡΠ΅ΡΡΠ²ΠΎ ΠΠΠ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ Π·Π° ΡΡΠ΅Ρ ΡΠΎΠ·Π΄Π°Π½ΠΈΡ Π±ΠΎΠ»Π΅Π΅ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΡ
ΠΠΠ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»Π΅ΠΉ. ΠΠΎΡΠΊΠΎΠ»ΡΠΊΡ Π²Π΅Π»ΠΈΡΠΈΠ½Π° ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΡΡΠ΅ΠΊΡΠ° ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ Π·Π°Π²ΠΈΡΠΈΡ ΠΎΡ ΠΌΠ°ΡΠΊΠΈ ΡΡΠ°Π»ΠΈ, ΠΌΠΎΠΆΠ½ΠΎ ΠΏΡΠ΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠΈΡΡ Π΅Π³ΠΎ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΠ΅ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ Π² ΠΌΠ΅ΡΠΎΠ΄Π°Ρ
ΡΠΊΡΠΏΡΠ΅ΡΡ-Π°Π½Π°Π»ΠΈΠ·Π°, ΠΎΡΠ΅Π½ΠΊΠΈ ΡΡΡΡΠΊΡΡΡΠ½ΠΎΠ³ΠΎ ΠΈ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΠΉ
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Study of effects of deformation in Nb3Sn multi filamentary strands
In the process that leads a flawless Nb{sub 3}Sn round strand to become part of a Rutherford cable first, and of a coil next, the same cabling process affects strands of different kinds in different ways, from filament shearing to subelement merging to composite decoupling. Due to plastic deformation, after cabling the filament size distributions in a strand usually change. The average filament size typically increases, as does the width of the distribution. This is consistent with the low field transport current of strands in cables being typically lower and less reproducible than for round strands [1]. To better understand the role of filament size in instabilities and to simulate cabling deformations, strands to be used in cables can be tested by rolling them down to decreasing sizes to cover an ample range of relative deformations. A procedure is herein proposed that uses both microscopic analysis and macroscopic measurements of material properties to study the effects of deformation
ΠΡΠ΅Π½ΠΊΠ° Π½Π΅ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΠΈ ΡΠΏΡΡΠ³ΠΈΡ ΡΠ²ΠΎΠΉΡΡΠ² Π»ΠΈΡΡΠΎΠ² ΠΈΠ· Π·Π°ΠΊΡΡΡΠΎΡΡΠ΅ΠΈΡΡΡΡ ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½ΠΎΠ² Π°ΠΊΡΡΡΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ
The widespread use of polyolefin foams in strategically important industries is due to their high thermal, sound and vibration insulation properties. The aim of the work was to evaluate the non-uniformity of elastic properties over the area of sheets of polyolefin foams of various types using the acoustic non-contact shadow amplitude method of testing and confirmation by the structural analysis method.The article presents the developed installation and a new method of non-contact acoustic testing of sheets made of closed-cell polyolefin foams based on recording the amplitude of the pulse that passed through the sheet and allowing to assess to the unevenness of its elastic properties during scanning. Studies of uneven elastic properties were carried out on sheets of closed-cell polyolefin foams of the ISOLON 500 and ISOLON 300 brands which differ in material and manufacturing technology (technique of cross-linking, method and multiplicity of foaming).It is shown that the absolute amplitude of the signal and its spread relative to the average value is affected by the structure of the foam polyolefin material and its heterogeneity over the area of the studied sheet determined by the production technology which is confirmed visually using microscopy.Studies have shown the effect on the indications unevenness of the method of obtaining and the apparent density of the material. It is shown that the most uneven elastic properties and structure belong to sheets of polyolefin foam obtained by chemical cross-linking technology (the unevenness of Ξ was 6.5 %). Among the physically cross-linked sheets of polyolefin foam the most uniform in structure and elastic properties are samples made of ethylene vinyl acetate with Ξ = 3.8 %, as well as sheets with a high foaming rate (Ξ = 3.9 %). The unevenness of structure of the studied sheets of polyolefin foams was confirmed by optical microscopy of sections in two mutually perpendicular directions.Π¨ΠΈΡΠΎΠΊΠΎΠ΅ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½ΠΎΠ² Π² ΡΡΡΠ°ΡΠ΅Π³ΠΈΡΠ΅ΡΠΊΠΈ Π²Π°ΠΆΠ½ΡΡ
ΠΎΡΡΠ°ΡΠ»ΡΡ
ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΠΎΡΡΠΈ ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½ΠΎ ΠΈΡ
Π²ΡΡΠΎΠΊΠΈΠΌΠΈ ΡΠ΅ΠΏΠ»ΠΎ-, Π·Π²ΡΠΊΠΎ- ΠΈ Π²ΠΈΠ±ΡΠΎΠΈΠ·ΠΎΠ»ΡΡΠΈΠΎΠ½Π½ΡΠΌΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌΠΈ. Π¦Π΅Π»ΡΡ ΡΠ°Π±ΠΎΡΡ ΡΠ²Π»ΡΠ»Π°ΡΡ ΠΎΡΠ΅Π½ΠΊΠ° Π½Π΅ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΠΈ ΡΠΏΡΡΠ³ΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΏΠΎ ΠΏΠ»ΠΎΡΠ°Π΄ΠΈ Π»ΠΈΡΡΠΎΠ² ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½ΠΎΠ² ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠΈΠΏΠΎΠ² Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π°ΠΊΡΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π±Π΅ΡΠΊΠΎΠ½ΡΠ°ΠΊΡΠ½ΠΎΠ³ΠΎ ΡΠ΅Π½Π΅Π²ΠΎΠ³ΠΎ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ ΠΈ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π΅Π½ΠΈΠ΅ΠΌ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΡΡΡΠΊΡΡΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π°.Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Ρ ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠ° ΠΈ Π½ΠΎΠ²Π°Ρ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° Π±Π΅ΡΠΊΠΎΠ½ΡΠ°ΠΊΡΠ½ΠΎΠ³ΠΎ Π°ΠΊΡΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ Π»ΠΈΡΡΠΎΠ² ΠΈΠ· Π·Π°ΠΊΡΡΡΠΎΡΡΠ΅ΠΈΡΡΡΡ
ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½ΠΎΠ², ΠΎΡΠ½ΠΎΠ²Π°Π½Π½Π°Ρ Π½Π° ΡΠ΅Π³ΠΈΡΡΡΠ°ΡΠΈΠΈ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Ρ ΠΈΠΌΠΏΡΠ»ΡΡΠ°, ΠΏΡΠΎΡΠ΅Π΄ΡΠ΅Π³ΠΎ ΡΠΊΠ²ΠΎΠ·Ρ Π»ΠΈΡΡ, ΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠ°Ρ ΠΎΡΠ΅Π½ΠΈΡΡ Π½Π΅ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΡ Π΅Π³ΠΎ ΡΠΏΡΡΠ³ΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ ΡΠΊΠ°Π½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π½Π΅ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΠΈ ΡΠΏΡΡΠ³ΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Ρ Π½Π° Π»ΠΈΡΡΠ°Ρ
ΠΈΠ· Π·Π°ΠΊΡΡΡΠΎΡΡΠ΅ΠΈΡΡΡΡ
ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½ΠΎΠ² ΠΌΠ°ΡΠΊΠΈ ISOLON 500 ΠΈ ISOLON 300, ΡΠ°Π·Π»ΠΈΡΠ°ΡΡΠΈΠ΅ΡΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠΌ ΠΈ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠ΅ΠΉ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½ΠΈΡ (ΡΠΏΠΎΡΠΎΠ± ΡΡΠΈΠ²ΠΊΠΈ, ΠΌΠ΅ΡΠΎΠ΄ ΠΈ ΠΊΡΠ°ΡΠ½ΠΎΡΡΡ Π²ΡΠΏΠ΅Π½ΠΈΠ²Π°Π½ΠΈΡ).ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π½Π° Π°Π±ΡΠΎΠ»ΡΡΠ½ΡΡ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Ρ ΡΠΈΠ³Π½Π°Π»Π° ΠΈ Π΅Ρ ΡΠ°Π·Π±ΡΠΎΡ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΡΡΠ΅Π΄Π½Π΅Π³ΠΎ Π·Π½Π°ΡΠ΅Π½ΠΈΡ Π²Π»ΠΈΡΠ΅Ρ ΡΡΡΡΠΊΡΡΡΠ° ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½Π° ΠΈ Π΅Ρ Π½Π΅ΠΎΠ΄Π½ΠΎΡΠΎΠ΄Π½ΠΎΡΡΡ ΠΏΠΎ ΠΏΠ»ΠΎΡΠ°Π΄ΠΈ ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌΠΎΠ³ΠΎ Π»ΠΈΡΡΠ°, ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΠΌΠ°Ρ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠ΅ΠΉ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π°, ΡΡΠΎ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π΅Π½ΠΎ Π²ΠΈΠ·ΡΠ°Π»ΡΠ½ΠΎ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΈ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π½Π° Π½Π΅ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΡ ΠΏΠΎΠΊΠ°Π·Π°Π½ΠΈΠΉ ΡΠΏΠΎΡΠΎΠ±Π° ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΠΈ ΠΊΠ°ΠΆΡΡΠ΅ΠΉΡΡ ΠΏΠ»ΠΎΡΠ½ΠΎΡΡΠΈ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π½Π΅ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΡΠ΅ ΡΠΏΡΡΠ³ΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΈ ΡΡΡΡΠΊΡΡΡΡ ΠΈΠΌΠ΅ΡΡ Π»ΠΈΡΡΡ ΠΈΠ· ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½ΠΎΠ², ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΏΠΎ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΠΈΠ²ΠΊΠΈ (Π½Π΅ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΡ Ξ ΡΠΎΡΡΠ°Π²ΠΈΠ»Π° 6,5 %). ΠΠ· ΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈ ΡΡΠΈΡΡΡ
Π»ΠΈΡΡΠΎΠ² ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½ΠΎΠ² Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΡΠΌΠΈ ΠΏΠΎ ΡΡΡΡΠΊΡΡΡΠ΅ ΠΈ ΡΠΏΡΡΠ³ΠΈΠΌ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌ ΡΠ²Π»ΡΡΡΡΡ ΠΎΠ±ΡΠ°Π·ΡΡ, ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½Π½ΡΠ΅ ΠΈΠ· ΡΡΠΈΠ»Π΅Π½Π²ΠΈΠ½ΠΈΠ»Π°ΡΠ΅ΡΠ°ΡΠ° Ρ Ξ = 3,8 %, Π° ΡΠ°ΠΊΠΆΠ΅ Π»ΠΈΡΡΡ Ρ Π²ΡΡΠΎΠΊΠΎΠΉ ΠΊΡΠ°ΡΠ½ΠΎΡΡΡΡ Π²ΡΠΏΠ΅Π½ΠΈΠ²Π°Π½ΠΈΡ (Ξ = 3,9 %). ΠΠ΅ΡΠ°Π²Π½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΡ ΡΡΡΡΠΊΡΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Π½ΡΡ
Π»ΠΈΡΡΠΎΠ² ΠΏΠ΅Π½ΠΎΠΏΠΎΠ»ΠΈΠΎΠ»Π΅ΡΠΈΠ½ΠΎΠ² ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π΅Π½Π° ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠ΅ΠΉ ΡΡΠ΅Π·ΠΎΠ² Π² Π΄Π²ΡΡ
Π²Π·Π°ΠΈΠΌΠ½ΠΎ ΠΏΠ΅ΡΠΏΠ΅Π½Π΄ΠΈΠΊΡΠ»ΡΡΠ½ΡΡ
Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡΡ
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