The relevance of studying product quality control as based on optimization of process input values parameters is shown. The paper explores the tolerance synthesis method of technological process ...input parameters based on regression dependences. Electrolytic chromium plating process simulation has been performed enabling to optimize input parameter tolerances and upgrade process equipment. As a result of the modernization the galvanic bathtubs were outfitted for control parameters of the electrolyte, heating of the electrolyte. The modernization of electrolytic chromium plating process allowed finding of values of input parameters being within the required limits and providing for the quality of the products.
A radical stable at room temperature was prepared by the oxidation of a toluene solution of 6,8-di-(
tert
-butyl)-3
H
-phenoxazin-3-one oxime with lead oxide PbO
2
. The DFT/B3LYP/6-311++G**,
ab ...initio
MP2/def2-svp, and CASSCF (15,15)/def2svp calculations showed the ground structure of the radical in which the spin density is concentrated on the heterocyclic nitrogen atom and energetically close electromeric form in which the spin density is predominantly localized on the exocyclic nitroso group. Two forms of the radical are the first example of electronic isomerism in the series of electroneutral organic structures.
The turning of Caprolon with a machining fluid is considered. If an aqueous water-repellent emulsion is supplied to the cutting zone in machining, the Caprolon absorbs less water, and the final ...surface quality is improved.
A series of zinc, copper, cobalt, and nickel bis(chelate) complexes (
I
–
IV
) with 2,4,9,11-tetra-
tert
-butylbenzo5,61,4oxazino2,3-
b
phenoxazin-1-ol (LН) of the general formula ML
2
is ...synthesized. The spatial and electronic structures of the synthesized coordination compounds are studied by the density functional theory (DFT B3LYP/6-311++g(d,p)). The molecular structure of the adduct of the copper complex with pyridine (
II
·Py) is determined by X-ray diffraction (CIF file CCDC no. 2113818). The spectral characteristics of the ligand and related complexes are studied.
Stable Turning of Fluoroplastic Workpieces Erenkov, O. Yu; Ivakhnenko, A. G.; Anikeeva, O. V. ...
Russian engineering research,
02/2020, Letnik:
40, Številka:
2
Journal Article
Recenzirano
Instability of the system in the machining of fluoroplastic is investigated. The influence of the cutting conditions and preliminary workpiece preparation on the roughness of the machined surface is ...determined. Turning conditions leading to instability of the system and sharp increase in roughness of the machined surface are identified.
The article deals with the issues related to the development of the processing equipment providing nanoscale precision of cutting by means of turning and milling. Building of a machine dynamic model ...is carried out to solve of this task. This allows taking into account the dynamic characteristics of the existing or designed equipment and the errors of dynamic setting of the machine and this also allows providing processing precision in nanometer range.
Two new copper(
ii
) complexes have been obtained by the reaction of sterically crowded triphenodioxazine ligands with Cu(
ii
) hexafluoroacetylacetonate. Compound
1
is a co-crystal of Cu(hfac)
2
...moieties and triphenodioxazine molecules within a quasi-one-dimensional crystal structure with only weak Cu N short intermolecular interactions (Cu N distances are equal to 2.69(1) and 2.75(1) Å). In contrast, complex
2
has a binuclear structure with two Cu(hfac)
2
units bridged through triphenodioxazine ligand with the covalent Cu-N bond length of 2.335(2) Å. The magnetic AC susceptibility data show that in spite of the absence of zero-field splitting in the Cu(
ii
) ion having the ground state with spin
S
= 1/2, both compounds demonstrate slow magnetic relaxation at the applied magnetic field. For a quasi-one-dimensional complex
1
, the optimal field for observing slow magnetic relaxation is 400 Oe, while for the binuclear complex it is 2500 Oe. The observed temperature dependence of the relaxation time in
1
is well described by the combination of Raman and direct mechanisms of relaxation, while for complex
2
the inclusion of Raman mechanism and quantum tunneling of magnetization is required to describe the relaxation behavior.
Cu(
ii
) hexafluoroacetylacetonate with triphenodioxazine ligands gives complexes with different crystal structures and magnetic properties.
—
The state of studies on determination of the lifetime of ion thrusters (IT), including their methodology, is analyzed. The erosion of the accelerating electrode (AE) of an ion-extraction system ...caused by charge-exchange ions is a critical process responsible for the IT lifetime. It is shown that the quickest and most accurate information on the nature of AE erosion and rate at the initial test stage can be obtained by a method based on the use of multilayer coatings, consisting of several pairs of optical contrast materials, preliminarily applied to the AE surface. The method allows the use of simple photographic devices for recording the erosion pattern and is especially efficient in the case of a highly nonuniform nature of erosion. The calculation procedure is presented for the parameters of diagnostic multilayer coatings, including the optimal layer thickness and total coating thickness, which allow data to be obtained on the surface erosion profile and rate, and on the charge-exchange ion current density distribution with the highest resolution during the given test time.
Research on substance abuse (including alcohol and narcotics) among students in Russia and Belarus shows that the lack of an adequate system of antinarcotics education and propaganda and a state ...system of treatment and rehabilitation for narcotics addicts is leading to the expansion of the black market in narcotics and an increase in demand for them.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Questions related to the creation of technological equipment by means of which nanodimensional precision in processing by turning methods may be achieved are considered. The solution of the problem ...is based on synthesis of the parameters of a dynamic model of a lathe, which makes it possible to take into account the dynamic characteristics of existing or newly designed equipment and the errors of dynamic alignment of the lathe.
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