491 research outputs found
Features of planning an automated production line of manipulator-type machines
Features of the development of automated processing of parts of manipulator type machines are considered. Optimization of the solution of transport problems leading to a change in the production structure of the enterprise, a change in the specialization forms of its workshops and production sites, a change in freight flow patterns, freight turnover values and associated transport and process schemes for handling unit loads are presented. All these transformations of transport and process schemes result in a change in the general plan of the enterprise, layout schemes of its production buildings, workshops and production sites and other changes in the production and organizational structure. A more detailed solution of the problem of determining the optimal routes in a lean production system is the optimization of process routes at the level of developing routing maps of technological processes for manufacturing each part of the product and assembly processes. Relying on key business processes and organizing assembly production on new principles, the enlarged planning of the production process made it possible to design a modern production module. ยฉ 2020 IOP Publishing Ltd. All rights reserved
The Mossbauer spectroscopy studies of epsilon to cementite carbides transformation during isothermal heating from as-quenched state of high carbon tool steel
This work presents results of investigations using the Mossbauer spectroscopy technique and their interpretation concerning transformation of ยฒ to cementite carbides during tempering in relation to the previously conducted
dilatometric, microscopic and mechanical investigations. Investigations were performed on 120MnCrMoV8-6-4-2 steel. The inยฐuence of the tempering time on nucleation and solubility of ยฒ carbides, and on cementite nucleation
and growth, was determined. The analysis of phase transformations during various periods of tempering using the Mossbauer spectroscopy technique made possible to reveal ยฏne details connected with the processes
Short-range order and precipitation in Fe-rich Fe-Cr alloys: Atomistic off-lattice Monte Carlo simulations
Short-range order (SRO) in Fe-rich Fe-Cr alloys is investigated by means of
atomistic off-lattice Monte Carlo simulations in the semi-grand canonical
ensemble using classical interatomic potentials. The SRO parameter defined by
Cowley [Phys. Rev. B 77, 669 (1950)] is used to quantify the degree of
ordering. In agreement with experiments a strong ordering tendency in the Cr
distribution at low Cr concentrations (~< 5%) is observed, as manifested in
negative values of the SRO parameters. For intermediate Cr concentrations (5%
~< c_Cr ~< 15%) the SRO parameter for the alpha-phase goes through a minimum,
but at the solubility limit the alpha-phase still displays a rather strong SRO.
In thermodynamic equilibrium for concentrations within the two-phase region the
SRO parameter measured over the entire sample therefore comprises the
contributions from both the alpha and alpha-prime phases. If both of these
contributions are taken into account, it is possible to quantitatively
reproduce the experimental results and interpret their physical implications.
It is thereby shown that the inversion of the SRO observed experimentally is
due to the formation of stable (supercritical) alpha-prime precipitates. It is
not related to the loss of SRO in the alpha-phase or to the presence of
unstable (subcritical) Cr precipitates in the alpha-phase.Comment: 9 pages, 8 figure
Complementary use of TEM and APT for the investigation of steels nanostructured by severe plastic deformation
The properties of bulk nanostructured materials are often controlled by
atomic scale features like segregation along defects or composition gradients.
Here we discuss about the complimentary use of TEM and APT to obtain a full
description of nanostructures. The advantages and limitations of both
techniques are highlighted on the basis of experimental data collected in
severely deformed steels with a special emphasis on carbon spatial
distribution
12-Ethยญoxy-2,3,8,9-tetraยญmethoxyยญbenzo[c]phenanthridine dichloroยญmethane solvate
The title compound, C23H23NO5ยทCH2Cl2, was obtained via the alkylยญation of the 12-hydrยญoxy-2,3,8,9-tetraยญmethoxyยญbenzo[c]phenanthridine salt. The benzo[c]phenanthridine ring system is essentially planar, with a mean out-of-plane deviation of 0.026โ
ร
. A dicloromethane molยญecule of solvation is present and located between the sheets of phenanthridine molยญecules, preventing any significant interยญmolecular hydrogen-bonding or ฯโฯ interยญactions
3,5-Bis(trifluoromethyl)iodobenzene
InChIโ=โ1S/C8H3F6I/c9-7(10,11)4-1-5(8(12,13)14)3-6(15)2-4/h1-3H
InChIKeyโ=โVDPIZIZDKPFXLI-UHFFFAOYSA-N
(reagent used as a versatile allylation or arylation component)
Physical Data:โbp 59โ61โยฐC (10 mmHg); fp 74โยฐC; d 1.919 g cm^(โ3).
Solubility:โsol DMF, acetonitrile, toluene, and most organic solvents.
Form Supplied in:โpale pink liquid; commercially available.
Purification:โdried over MgSO_4 and fractionally distilled under vacuum.
Handling, Storage, and Precautions:โair, light, and moisture sensitive; to be handled in an inert atmosphere; stored in cool, dark, and dry conditions and away from oxidizing agents
Crystal structure of (E)-4-benzylidene-6-phenyl-1,2,3,4,7,8,9,10-octahydrophenanthridine
The preparation of the title compound, C26H25N, was achieved by the condensation of an ethanoยญlic mixture of benzaldehyde, cycloยญhexaยญnone and ammonium acetate in a 2:1:1 molar ratio. There are two crystallographically independent molยญecules in the asymmetric unit. The two cycloยญhexyl rings adopt an anti-envelope conformation with the benzyl moiety adopting a cis conformation with respect to the nitroยญgen atom of the phenanthridine segment. In the crystal, molยญecules are linked through CโHโฏN interยญactions into hydrogen-bonded chains that are further arranged into distinct layers by weak offset ฯโฯ interยญactions
Zeta Inhibitory Peptide attenuates learning and memory by inducing NO-mediated downregulation of AMPA receptors
Zeta inhibitory peptide (ZIP), a PKMฮถ inhibitor, is widely used to interfere with the main- tenance of acquired memories. ZIP is able to erase memory even in the absence of PKMฮถ, via an unknown mechanism. We found that ZIP induces redistribution of the AMPARGluA1 in HEK293 cells and primary cortical neurons, and decreases AMPAR-mediated currents in the nucleus accumbens (NAc). These effects were mimicked by free arginine or by a modified ZIP in which all but the arginine residues were replaced by alanine. Redistribution was blocked by a peptidase-resistant version of ZIP and by treatment with the nitric oxide (NO)- synthase inhibitor L-NAME. ZIP increased GluA1-S831 phosphorylation and ZIP-induced redistribution was blocked by nitrosyl-mutant GluA1-C875S or serine-mutant GluA1-S831A. Introducing the cleavable arginine-alanine peptide into the NAc attenuated expression of cocaine-conditioned reward. Together, these results suggest that ZIP may act as an arginine donor, facilitating NO-dependent downregulation of AMPARs, thereby attenuating learning and memory
MANUFACTURING OF DISPERSION-STRENGTHENED IRON WITH PRELIMINARY SURFACE OXIDATION
As a result of mechanical alloying with oxygen in consequence of surface oxides dissolution during processing of pre.oxidized iron powder in the mill, bulk iron samples containing FexO strengthening oxides of 2.5 nm size were obtained. It is shown that the samples of ODS.iron have increased strength characteristics (.0.2 ~ 570 MPa, .B ~ 632 MPa).ะ ัะตะทัะปััะฐัะต ะผะตั
ะฐะฝะธัะตัะบะพะณะพ ะปะตะณะธัะพะฒะฐะฝะธั ะบะธัะปะพัะพะดะพะผ ะฒัะปะตะดััะฒะธะต ัะฐััะฒะพัะตะฝะธั ะฟะพะฒะตัั
ะฝะพััะฝัั
ะพะบะธัะปะพะฒ ะฟัะธ ะพะฑัะฐะฑะพัะบะต ะฒ ะผะตะปัะฝะธัะต ะฟัะตะดะฒะฐัะธัะตะปัะฝะพะณะพ ะพะบะธัะปะตะฝะฝะพะณะพ ะฟะพัะพัะบะฐ ะถะตะปะตะทะฐ ะฑัะปะธ ะฟะพะปััะตะฝั ะพะฑัะตะผะฝัะต ะพะฑัะฐะทัั ะถะตะปะตะทะฐ, ัะพะดะตัะถะฐัะธะต ัะฟัะพัะฝัััะธะต ะพะบัะธะดั FexO ัะฐะทะผะตัะพะผ 2,5 ะฝะผ. ะะพะบะฐะทะฐะฝะพ, ััะพ ะพะฑัะฐะทัั ะะฃะ.ะถะตะปะตะทะฐ ะพะฑะปะฐะดะฐัั ะฟะพะฒััะตะฝะฝัะผะธ ะฟัะพัะฝะพััะฝัะผะธ ั
ะฐัะฐะบัะตัะธััะธะบะฐะผะธ (.0,2~570 ะะะฐ, .ะ~632 ะะะฐ).ะ ะฐะฑะพัะฐ ะฒัะฟะพะปะฝะตะฝะฐ ะฟะพ ัะตะผะฐะผ ยซะกัััะบัััะฐยป, โ ะะะะ-ะ18-118020190116-6, ะฟัะธ ัะฐััะธัะฝะพะน ะฟะพะดะดะตัะถะบะต ะ ะคะคะ โ 18-03-00216. ะญะปะตะบััะพะฝะฝะพ-ะผะธะบัะพัะบะพะฟะธัะตัะบะธะต ะธััะปะตะดะพะฒะฐะฝะธั ะฟัะพะฒะตะดะตะฝั ะฒ ะะญะ ะฆะะ ะะคะ ะฃัะ ะ ะะ
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