The tools with secondary treatment from collection of the Late Paleolithic site near the Kamyanka village of Izum district in Kharkiv region are published in the paper. The collection of 8356 flint ...artifacts comes from the excavated area of 225 m2. The group of the tools with secondary treatment is not large — it consists of 88 items (1.05 %), typical for sites located near flint raw material outputs, where primary treatment took place directly in the dwelling area. From 27 burins 16 are straight burins, 5 are angle burins, 5 are truncation burins, a flat-faceted burin, a many-faceted burin and a double burin. As a preform, the flakes, blades, massive flakes and residual cores were used. There are 12 end-scrapers and scrapers; end-scrapers on flakes and blades prevail. The tools with notches are represented by 9 exemplars. Working elements of the piercing tools (4 exemplars) are formed by several splits on the flakes; in one case the tool is combined with middle burin. 11 flakes and blades have retouched areas. Microblades with truncated edge are represented by 16 exemplars. Notched backed points (whole one and 2 fragments) have no analogs in collections of the sites of allied territories. A high trapeze on a wrong-shape blade, a massive blade with an angle unit pointed out by retouch, a chisel-like item, a disk-shaped tool with retouched area are represented in one exemplar for now.
Generally the tools set is typical for Epigravettian sites, though the presence of notched backed points in it raises a range of questions which can be answered on during the further research.
Using the ARGUS detector at the
e
+
e
− storage ring DORIS II, we have searched for the real and imaginary part of the electric dipole formfactor
d
τ
of the
τ lepton in the production of
τ pairs at
q
...2=100
GeV
2
. This is the first direct measurement of this
CP
violating formfactor. We applied the method of optimised observables which takes into account all available information on the observed
τ decay products. No evidence for
CP
violation was found, and we derive the following results:
Re(d
τ)=(1.6±1.9)·10
−16
e
cm
and
Im(d
τ)=(−0.2±0.8)·10
−16
e
cm
, where statistical and systematic errors have been combined.
The paper presents the results of alloying titanium by oxygen in the process of chamber electroslag remelting. As an oxygen-containing ligature, we used the electrodes-satellite from the reaction ...mass residues mixture from the retort lid for magnesium thermal reduction of a titanium sponge, a specially prepared gaseous argon oxygen mixture containing 30% oxygen applied directly to the melting space, microsize (10-15 mm) powder particles of titanium oxide and titanium oxide nanopowder with a particle size of 21 ± 5 nm. The structure and the properties of titanium alloyed by oxygen from the oxygen-containing ligature, gas phase and titanium oxide powder during chamber electroslag remelting of the titanium sponge are investigated. It was found that at the oxygen content of 0.053%mas. to 0.22%mas. in the metal formed a homogeneous single-phase structure typical for commercial titanium formed by polyhedral grains of the α-phase. The increase of the oxygen concentration in titanium for more than 0.22%mas. leads to the formation of the microstructure with a typical needle structure, which allows it to be classified as the α ׳-phase. / U radu su prikazani rezultati legiranja titanijuma kiseonikom u procesu elektropretapanja pod troskom u peći. Za vezivo, koje sadrzi kiseonik, korišćene su satelit elektrode iz reakcije masenih ostataka mešavine iz poklopca retorte za termalnu redukciju magnezijumtitanijumskog sunđera, specijalno pripremljena mešavina gasa argona i kiseonika sa 30% kiseonika primenjena direktno na mesto topljenja, čestice praha titanijum-oksida mikroveličine 10-15mm i nanoprah titanijum-oksida veličine čestica od 21± 5 nm. Ispitane su struktura i karakteristike titanijuma legiranog kiseonikom iz veziva , gasne faze i praha titanijum-oksida tokom elektropretapanja titanijumovog sunđera pod troskom u peći. Utvrđeno je da se pri sadržaju kiseonika od 0.053%mas.do 0.22%mas. u metalu formira homogena jednofazna struktura tipična za komercijalni titanijum formiran od poliedarnih zrna α-faze. Povećanje koncentracije kiseonika u titanijumu za više od 0.22%mas. dovodi do formiranja mikrostrukture s tipičnom igličastom strukturom, što omogućava da bude klasifikovana kao α ׳-faza.
Synthesis of calcium phosphates on titanium Snizhko, L. A.; Kalinichenko, O. A.; Misnyankin, D. A.
Surface engineering and applied electrochemistry,
05/2016, Letnik:
52, Številka:
3
Journal Article
Recenzirano
On the basis of studying the phase and elemental composition of calcium phosphate coatings deposited on titanium by anodic spark oxidation from aqueous solutions, a mechanism of formation of ...bioactive ceramic components is proposed. The effect of the solution composition and the deposition time on the thickness and porosity of the coatings is studied. It is shown that an increase in the coating thickness leads to a decrease in the coating porosity and that the Ca/P ratio in the coatings hardly depends on the concentration of tricalcium phosphate solubilized with sodium complexonate.
A maximum likelihood analysis of ARGUS data on two-photon production of
π
+
π
+
π
0
π
0
π
−
π
− is presented. A small fraction of events is due to the production of omega pairs. The
γγ →
ωω cross ...section has its maximum value close to threshold.
Using the ARGUS detector at the e
+e
− storage ring DORIS II at DESY, we have searched for decays
b →
s
gluon through full reconstruction of a whole event. Two B
B
decays were found with one of B ...meson decaying into a final state without charmed particles. We also obtained an upper limit of
Br(B
+ →
τ
+
ν
τ
) of 1.04% at 90%
CL.
Using the detector ARGUS at the
e
+
e
− storage ring DORIS II at DESY, we have observed the decays
Λ
c
+ →
Ξ
−
K
+
π
+ and
Λ
c
+ → Ξ
∗0K
+
and obtained evidence for the decay
Ξ
c
0 →
ΛK
s
0. All ...three of these decays are of interest as they provide information about
W-exchange processes. The products of cross sections and branching ratios for
Λ
c
+ →
Ξ
−
K
+
π
+ and
Λ
c
+ → Ξ
∗0K
+
are (1.7±0.3±0.3) pb and (0.6±0.2±0.1) pb, respectively, which implies that (35±17) % of the
Ξ
−
K
+
π
+ final state is generated through a two-body decay via intermediate
W-exchange. The product of production cross section and branching ratio for
Ξ
c
0 →
Λ
K
s
0 is (2.1 ± 1.0 ± 0.6) pb.
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