SCIENTIFIC ABSTRACT PETRAYTITE, I.K. - PETRE, A.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R001240310018-1
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: January 3, 2017
• Document Release Date: June 21, 2000
• Sequence Number: 18
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

PETRAYTITE, I.E. (Shyaulyay)
,
Some connections between the school courqes In astrowmW and
mathemaiies. Mt.v shkole no.5236-39 S-0 162. (MML 15312)
(YAthematic"tudy and -teaching)
(AstranonW--Study and teaching)

PET.rfAZHIIX..A' V.
Pros-nects in the Utilization of Atomic Power for the Generation of
Electric Power (by a Member of the Czechoslovak Academy of Sctences).
Elektroenerriya (Electric Power), #7-8:5:Jul-Au,- 55

S/124/61/000/012/029/038
D237/D304
AUTHOR: .-Ietrazhitskiy, G. B.
TITLE: Experimental investigation of drop evaporation
at high temperatures and pressures
PERIODICAL: Referativnyy zhurnal, Mekhanika, no. 12, 1961,
106, abstract 12B741 (Tr. OdesBk. un-ta, Ser.
fiz. n., 1960, 150, no. 7, 125-136)
TEXT: The results are given of a large number of experiments
performed by the author on drop evaporation of a number of li-
quids (water, ethyl alcohol, petroleum) at high pressures (up
to 40 atm.~ and elevated temperatures of the surrounding medium
(up to 500 C),, Experimental results are tabulated in terms of
rate of change of surface of the drop v. experim3ntal conditions,
4 references. CAbstracter's note: Complete translation.-7
Card 1/1

B/124/61/000/012/030/038
D237/D304
AUTHOR: Petrazhitskiy# G. B.-
TITLE: Determining heat transfer in a drop by the
boundary layer method
PERIODICAL: Referativnyy zhurnal, Mekhanika, no. 12, 1961,
106, abstract 12B742 (Tr. Odessk. un-ta, Ser.
fiz. n., 1960, 150, no. 7, 137-160)
TEXT: Application of known methods of boundary layer theory
permitted the author to calculate, under some definite aesump-
tions, the intensity of heat transfer on the surface of evapora-
ting drop for the case of laminar flow. Processing of data
mentioned in the former work (ref. 12B741) shows a satisfactory
correspondence between theoretical and practical results, and
the author mentions good agreement of his data with those ob-
ta4ned by other authors. Specific experimental conditions
(high pressures) did not allow the author to explain more widely
Card 1/2

S/124/61/000/012/030/038
Determining heat transfer ... D237/D304
the influence of a transverse flow of a surrounding medium on
the heat transfer intensity. 719 references., f-Abstracter's I /
note: Complete translation,_, 'G
Card 2/2

S/081/61/000/019/014/085
B101/13147
A0110t: Petrazhitakiy, Go B.
TrTLItt Evaluation and generalization of test results concerning
evaporation of drops
PERIODICAL: leforativnyy zhurnal. Xhimiya, no,19, 1961, 48, abstract
19B373 (Tr. Odessko un-tat Sere fiz. n., v. 150, no. 7,
ig6o, W-186)
TEM The author studied experimental data of the evaporation of water
drops, drops of 96 % ethyl alcohol, and of U-1 (TS-I,fuel at 90-5000C,
11-61 atop Reynolds number Re .115-450, and ratio between vapor pressure
drop and total pressure: Ap/p =0.02-0.23. The test results are
oxyressed by the equation: Nul -2 +0-42 He 0.56 Pr'O'33 0 +&p1p)(AV4)0.22
Bereg W Is the Nusseltcriterion for diffusion, Pr' is the Prandtl
or'Iterion for diffusion, p9 is the molecular weight of the gas in which
evaporation takes place, g v is the molecular weight of the vapor. It was
CardA/;

S/081/61/000/019/014/085
Ivaluation and generalization of... BIOI/BI47
shown that the temperature of the evaporating drop was independent of the
rate of the flow streaming around the drops the temperature can be
calculated from the conditions of evaporation of an immobile drop.
ResOlts of calculations agree with the experimental data with an
accuracy of 3-5 %. [Abstracter's note: Complete translation.]
card 2/2

PETRAZHITSKIY, G.B., kand.tekhn.nauk; POLEZHAYEV, V.I., lnzh.
Engineering method of analyzing nonstationary processes of heat
conductivity in thin multiple-layer walls. Teploenergetika 9
no.2:73-76 F '62. (MIRA 15:2)
(Heat--Conduction)

S/096/62/000/002/006/oo8
E031/E584
.26s-100
AUTHORS: Ptetraz Candidate of Technical Sciences
and Polezhayev, V.I., Engineer
TITLE; An engineering methodi of calculating the non-
stationary heat conduction in thin sandwich walls
PERIODICALi Teploenergetika, no.2, 1962, 73-76
TEXT; An absolutely stable finite differevice scheme is
proposed for the one-dimensional heat conduction equation In
which, for given 6 x; the size of the time step is only bounded
by the permissible error of the approximation resulting from the
replacement of the differential equation by finite difference
equations. An implicit finite difference relation for the
temperature on the boundary corresponding to boundary conditions
of the third kind can be obtained from the equation of heat
balance for a boundary layer of thickness A x/2 calculated for
the next time step. A direct method of solving the resultinQ
system of algebraic equations is described, The method is
applicable in the case of radiation from the boundaries and
methods of linearising the radiative terms are discussed, In
Card 1/2

An engi-necring method of -. s/oq6/62/000/002/oo6/oo8
E031/E584
this case the finite difference equations are not absolutely
stable, There are two figures and 8 references! 7 Soviet-bloc
and 1 a Russian translation of a n.on-Soviet publication
'8
Card 2/2

NXI AT7000299 SOURCE CODE: UR/31142/60/150/007/0125/0136
AMMOR. retrazhitskly, G. B.
:ORG: None
,TITLE: Experimental investigation of vaporization of drops at high temperatures and
ipressures
iSOURCE: Odessa. Universitet. Trudy, v. 150. Seriya fizicheakikh nauk, no. 7, 1960.
tVoprosy ispareniya i goreniya v dispersnom vide (Problems of evaporation and combus-
I
i,tion in the dispersed state), 125-136
TOPIC TAGS: vaporization combustion chamber, liquid fuel 70'e'c
F,-r -C 0- r r PA? i s s ue E K ~ f T - r
ABSITACT: The article contains a brief description of experimental research to obtain
data on vaporization of liquid drops in a stream of gas under high pressure and tem-
perature conditions. Heat transfer and masa exchange between the drops and tile gas
flow were studied by vaporizing water, 96% ethyl alcohol and TS-1 fuel in a stream of
air at pressures from 10 to 60 gauge atmospheres and temperatures ranging from 90 to
500*C. Water was also vaporized from the surface of a porous sphere at atmospheric
pressure in a gas flow held at a constant temperature of approximately 28000C. A de-
tailed description is given of the experimental equipment used for producing the ne-
cessary high pressures and temperatures. The experiments were conducted by holding
cord

; ACC NRa AT7000299
Isome parameters constant while varying others. The results are tabulated. These
numerical data may be useful for designing combustion chambers,for Jet engines, as
well as in many processes of the chemical and power industries. Orig. art. has: 4
~figures, 8 tables.
-
IsuB ODDE:. 20, 21/ SUBM DATE: Done/ oRiG REF: oo4

ACC NR. M0063&7 SOME CODE: UH/3142/6o/150/007/0137/oi6o
AUVOR. Pel
ORG: None
i
I-j'ITLE: Use of the boundary layer method for calculating heat transfer to a drop
SOURCE: Odessa. Universitet. Trudy, v. 150. Seriya fizicheskikh nauk, no. 7, 1960.
Voprosy ispareniya i goreniya v dispersnom vide (Problems of evaporation and combus-
tion in the dispersed state), 137-160
TOPIC TAGS: boundary layer problem, laminar heat transfer, flow analysis
ABSTRACT: A method based on laminar boundary layer theory is proposed for calculating,
heat transfer to a drop assuming that the boundary layer on the surface of the combus-,
tion chamber in a jet engine maintains a laminar form during motion of the drop. Trne
procedure involves exact solutions of the boundary layer equations for strearns with
power-law distribution of velocity in the external flow. The method may be extended
to the case where the drop differs from spherical shape, as long as axial symetry is
maintained. Consideration is given to the effect which transverse flow, variations
in physical constants and longitudinal pressure gradient have on the heat transfer
coefficient. A comparison with theoreticEd data shows that the proposed method for
calculating heat transfer coefficients gives somewhat overstated values for the ratio
Card 112

'!--ACC - NFi,-A'f ffdbj(570
.of the average Nusselt number on the surface of the drop to the fiquare root of tli-le
,Reynolds number for the critical point on the leading edge of the sphere. An expla-
,nation is given for this discrepancy. It is shown that the rate of drop vaporization
at high flow temperatures increases with external pressure when the Reynolds number
for the critical point on the leading edge of an axially symmetric drop is held con-
stant. At the same time, the rate of vaporization becomes less dependent on tempera-
ture. Or'ig. art. has: 14 figures, T6 formvLlas.
~
SUB CODE: 20 /SUBM DATE: None/ ORIG REF~; 010/ OTH REF: 009
Card 2/2

ACC NRs Kf7000301 SOURCE WDL: UR/31h2/60/150/007/016i/oA6
AUTHOR: retrazhitakiy, G. B.
ORG: None
:TITLE: Analysis and generalization of the results of experimental investigation of
,drop vaporization
SOURCE: Odessa. Universitet. Trudy, v. 150. Seriya fizicheskikh nauk, no. 7, 1960.
i
Voprosy ispareniy4 i goreniya v dispersnom vide (Problems of evaporation and combus-
tion in the dispersed state), 161-186
TOPIC TAGS: vaporization, boundary layer problem, laminar heat transfer, Reynolds
number, Nusselt number, Prandtl number
~ABSTRACT: Experimental data on vaporization from drops are used for derivatior of
molecular heat and mass transfer equations .n the boundary layer in terms of the
specific heat and the coefficients of thermal conductivity and diffusion at constant
pressure where the average temperature of V.-ie boundary layer is taken as the control-
fling temperature. The coefficient of kinematic visconity for the parameters of the
loncoming flow was calculated at ambient temperature. The latent heat of vaporization
and partial vapor pressure on the surface of the drop were reduced to the surface
temperature. It is shown that drop temperature is strongly affected by the physical
~properties of the fluid, flow temperature, ambient pressure and vapor concentration
2

I- ACC-Nk'.--- ATIO00301
!of the given fluid in the gas surrounding the! drop. The mthods of dimensional analy-
i
!sis are used for finding a generalized relat'Lonship for drop vaporization asswning
I
~that physical constants and experimental conditions are independent of temperature
and concentration. Analysis of experimental data on water vaporization at constant
temperature and pressure gives the following relationship between the Nusselt diffu-
0.56
sion number and the Reynolds number: Nu'=2+C-Re , which shows a deviation of less
than 6% from the experimental data. The constant C depends on the temperature and
pressure at which the experiments are conducted. The relationship between the Nusselt
diffusion number, the Reynolds number and the Prandtl diffusion number for water is
given by the formula: Nu'=2+0.46*ReO.56.pri'0.33(1+Ap/p), which shows a deviation of
less than 6.5% from the experimental data. The corresponding formulas for 96% ethyl
alcohol and TS-1 fuel have constant coefficients of 0.39 and 0.29 respectively. The
effects of flow temperature and pressure on the rate of drop vaporization are analyzed.
and a formula is derived for calculating the time required for total vaporization of
a drop. Orig. art. bas: 18 figures, 7 tables, 32 fe~rmulfis.
SUB CODE; 20/ SUBM DATE: Bone/ ORIG,REF. *0091 OTH REF: 005
Card 2/2

J. pi~1*17M:
"The river pearl oyster in our country (~',argaritana margaritifera Linne). p. 43.
(CASOPIS; ODDIL -P?L--WDOV-MN,*If Vol. 121, no. 1, 1952, Prague, Czechoslovakia)
SC: Monthly List ot' East European Ac,;essiurts, L.C., Vol. 2 No. 7, JUIY 1953, Uncl.

PLTR-30&' J.
J- U1.
Petrbok, J. Stratigraphic chronolo,-,-7 an,-A, faima of Tardenoisian layers in the
Macanske Vrsky highlands of the Sered arDa in Slovakia. o.33.
Vol. 10, no. 1, 1955 bluLl-Y-11A )jra*AsIava, Ozechosiovakia
SO: Monthly List of East European Accessiors, OuAL), LO, Vo.L. 5, i,,o. 2
February, 1956

vo

J. PET11BUIC
"Mollusks of Pracbatice and its nearest environs. p. 4. (CASCIFIS; UDDIL
PRI10DOVEDIrf, Val. 121, no. 1, 1952, Prague, Czechoslovakia.)
SO: Monthly List of East European Accessions, L.C., Vol. 2 No. 7, JulY 1953~ Uncl.

PE-T.RBOX, Jaroslav
SUM-2.,-Given Nar"
COUntrys Czechoslovakia
Academic Degreass /not given/
Affiliations /not given/
sources Prague,, Casopis pro Minerelogii a Geologii, Vol VI, No 2, 1961,
pp 203--206.
Datal "A Study in the Quarternw.-y Period of the Trans-Carpathian Ukraine.
Gro 981643

FETADIKO M.
"Sintered Carbide As a Construction Material." p. 834 (STROJIRMTVI, Vol. 3, No. 11,
Nov. 1953) Praha, Czechoslovakia
SO: Monthly List of East European Accessions, Library of Congreas, Vol. 3, No. 4,
April 1954. Unclassified.

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FEMDULY, !%; DTTiFY,, V.
ContributLon to the study of the riritering phase of camentod carbldcs. p. 786.
HUTNIGKE LI6STY. ('Iinisterstvo hutnLho prumyslu a rudnych dolu. a Ceskoslovenska
vedecka technicka spolenost pro hutnietvi. a slevarenstvi) Drno, Czechslovak-ia.
Vol. lj~, no. 9, Sept. 1959.
~'.Onthly list of East European Accessions (EEAI) 1,C, vol. 9, no. 1, Jan. 1960.
Uncl.

-,PETRDLIK3 Rtroslav; SHTROBL, Yaroslav (Strobl, Jaroslav]
Sintered steel alloyed -j.*Ltb c3pppe-.", niakel, arLd
Porosh.met. 2 no.1:8&-91 Ja-F 162. e , -, :~ : ; )
-1 -
1. Institut poroshkovoy inetallurgii., Praga.
(Powder metallurgy)

FETRDUK, Miroslav,, inz.
Pr,)duction of spongy i3mm powder from the waste pickling
solutions. Hut'listy 117 no,4:256-259 Ap 162o
1, VyzkuW uatav pro praokovou metalurgii,, Veotec
u Prahy.

BCUSs B., dr.. inz.; CMU, V.0 iu.; TEINDL, Je; FANTp Fo. inz.;
MMI R.; FLTRDLIK, Ydroalav, inz.; RMR, 14.
Infoxnations on wtallurgy. Hut listy 17 no-8:598-WS
Ag 162.

FETIU.171-1 P11-11 .
IIIAzarus Ercker of Schreckenfelq.11
Futnicke Usty, Brno '0 ~
-, VOI 9, " -, 11Y 1951,, p. 2c'15
SO: Eastern European Accessions List, Vol 3, "o 10, Oct lgrl,/,, Li'--. of CDngres2

1' 7TW) A' V , ' ' .
"A contribution to th~3 theory anI practice :)f jjiIji::g metal powders -n ba]l ' 7-111'3. " p. 297
(Hutnicke ListZ Vol. 8, :,,o. 6, Juhe 1953. Rr-io.)
SO: Monthly List of East European Accessions., Vol. 3, No. 2, Library of Congress, Feb. 1954
i1nel.

YETRDLIX 9 M. -
"A Ontributim'to the Theory and Practice of Milling Metal Powders In Ball
mins," p - 241.
(Hutnic*e Upty Vol.6, No-5, VAY 1953p Brno.)
East " .2 No.
SO: Month List of wr ggegansons, -r1r7 o? Congressp - September 1953) Uncl-
- - �u0tv - Ifib

PFTRM3X 9 H.
OPropartles of Wtal Powders Reduced by Hydro en at loov Temperatures,'* 4..2452e
(Hutvl~Le Usty. Vblott,, 110.5,, ~hY 1953, Bmo.l
East Eur
301 Hont List of Mr Mclessionn OUP Congress, - sf-.ptP-,,her 953, Uncl.
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4be mlarinqt It. A dc-Arription is given of a torlbod of
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,== in the continuously wmbw twum. and
.1 jcakl. the comps. of the interandiery re-
s for varbmu drgrm cl oxidulon bwed an
sbroxiclationeo. The mper also giva bdorma;vm ontin
mflumm of all Won an the rcdwdom of W addr Is a
coutinnowly world" twWw lab. Imam*. The gm
"p~mmt and ma condkimew an lAy dnwbW mbd tbe
Wwts an plotted &W tsb&W. I am

!T'TiiDLIK, Miroslav, inz.; BORN, Milan, inz.
Effect of impurities in stnter(d4 steel. HiA 17~ ,:413-
1.
420 je 164. ;1
I

KWLIK, J.;-PBTRDLIK, M.
The problem of iron dust production in Czechoslcrra;da; disc-.Ls2licn.
Hat linty 16 no.6s429 Ja 161.

PETPDLIK, M.; DTFEK, V.; UCHYT1L, J.
"Selection of the most suitable technology of sintered G, carbides frm technological
processes aFplied in two plants. p. l(Y7.11
STLTKATY. Fraba, Czechoslovakia. Vol. 2, no. 3, 10/58,
Monthly list of East European Accessions (EEAI), LC, Vol. 8, 110.6 , Jun 59, Unclas.

CZECH/34-59-9-8/22
AU-MORS: Petrdl1k, Mirosla,.,, Engineei and Dufek, Vladimir, Engineer
TITLE: Contribution to the Study of the Sintering Phase of
Cemented Carbides
If
PERIODICALs Hutnicke listY, 1959, Nr 9, PP 786-790
ABSTRACT: In this preliminary report the authors describe the
used method of studying the sintering phase and the
influence of this phase on the final properties of the
cemented materials used in the experiments. A certain
disadvantage of this process is the fact that the
sintering phase is studied in an isolated form without
the presence of the main carbide framework which could
be produced by a somewhat different method of crystalliza-
tion and which would quite definitely manifest itself in
the final properties of the cemented carbide components.
Therefore, the arrived at conclusions should be verified
on sintered carbides produced by ordinary methods using
sintering media which proved most suitable in the here
described tests. In these, the authors investigated
the properties of an "artificial sintering substancell
i.e. a fused cobeklt alloy, the composition of which was
Card 1/3 chosen to correspond with the ideas of the author on the

CZECH/34-59-9-8/22
Contribution to the Study of the Sintering Phase of Cemented
Carbides
desired composition of the sintering phase in sintered
carbides currently used in machining and fabricating.
Such tests can also be applied for studying the effect
cf certain additional carbide admixtures, which have a
pronounced influence on the properties of the sintering
phase. As examples, the authors describe the application
of this method to the study of crystallIzation of Co-WC
systems with various CO/WC ratios (50, 33, 45% WC) and
Co-WC systems, some containing additionally TiC, TaC,
CrjC2u and VC. on the basis of the obtained results,
th a thors conclude that the composition and the
crystallization of the Bintering phase cannot be allowed
to be governed by random manufacturing conditions and that
it is necessary to study systematically the phenomena
occurring in these three ranges, which are diagrammatically
outlined in Fig 10, P 789. This is a sketch representing
the crystallization of the sintering phase in the cavity
of a carbide and consists of intrazonal, monozonal and
Card 2/3 polyzonal ranges of crystallization. The authors believe

CZECff/34-59-9-8/22
Contribution to the Study of the Sintering Phase of Cemented
Carbides
that systematic study of the relevant phenomena could
lead to a substantial improvement in the properties of
commercially important cemented carbides, to advantages
in alloying with substances which dissolve in the
Bintering phase, thereby ensuring better mechanical
properties. That success can be achieved in this way
is proved by the favourable results obtained with the
Czech produced universal sintered carbide, which is
alloyed with a sinall quantity of Cr C which,during
the process of sinteringspasses intg he cobalt sinter-
ing phase. There are 11 figures (including 10 micro-
photographs), 2 -tables and 36 references, 12 of which
are Czech, 9 German, 8 Soviet and 7 English.
ASSOCIATION: V57zkumny U'stav pro pr'a'skovou metalurgii, Vestec u
Prahy (Research Institute for Powder Metallurgy, Vestec,
Nr Prague)
SUBMITTED: January 13, 1959
Card 3/3

PETPDIZK, -1 1,11.
"Impurities and adr!txtures in sintered metals, H Changes in The wzounts of
impurities during the preparaticn of tungsten and tungsten carbide powders.
P. 130011
P. 1300 (Chenicke Listy, Vol. 51, no. 7y July 1957, Praha, Czechoslovakia)
Monthly Index of East European Accessions (E%U ) LG, Vol. 7, No. 7, July 1956

TRDLI K" 1\1
CZ,,JM10.'.1L0V),XIA / Chen, ical Teohnology, Chemical rrod- F1
uota nnd Th(slj, Application, Part 2. -
Elements, Oxides, 14ineral w.11ti,
Bases, Salts. - Other aiements, Ox-
ides, Mineral ,acids, Bases, Salts.
Abs Jour: Ref Zhur-Khimiytt, No 16, 1956, 61503.
Author MLLaajay
Inot. N:>t given.
Title Impurities and Admixtures In Sintered 1~etals.
I. Changes of Impurity Contents at Preparn-
tion of Tungsten and Tungsten-Carbide Powdero.
r,
Orig rub: Chem. listy, 1951) 51P No 7, 1300 - 1303.
Abstract: The author studied the behavior Of some impu-
rities (Na 20, 11go, Cao, Sio~, Fe2O bn, S, P
and As) at the reduction of 40 wii~ hydrogen
at the temperature of about 9080 and found
that the major part of S and As present as im-
Card 1/3 16

CZECHO"DLOVAKIA / Chemical Technology, Chemical Prod- H
ucts and Their Application, Part 2. -
Elements, Oxides, Mineral iicids,
Bases, Salts, - Other Elements, Ox-
ides, Mineral Acidsj Bases, Salts.
Abs Jcur: Ref Zhur-Khimiya, No 18, 1958, 61503.
Abstract: purities evaporates at that occasion. Other
admixtures, viz. P, S1021 14gO and J~aO, evap-
orate at the temperature of about 15000, when
tungsten powder converts into tungsten carbide
during*the process of carbide formation. The
oxides of alkali-earth methals are reduced to
metals by carbon or tungsten carbide at the car-
bide formation; S102 is reduced to SiO. These
substances (admixtures), which are volatile at
the carbide formation temperatures, escape from
the product. They get into contact with the
traces Of 02 in the electrolytic hydrogen (pro-
Card 2/3

CZ,XHOSLOVAKI't'. / Chemical Technology, Chemical rrod- H
ucts and Their Application, Part 2. -
Elements, Oxides, Mineral Acids,
Bases, Salts. - OtIner Elements, Cx-
...ineral ,cids, Base salts.
ides,
Abs Jour: Ref Zhur-Y-himiya, No 18, 1958, 61503.
Abstract: ducing the protective atmosphere), oxidize
again, and settle in the fire zone of the fur-
nace, where they produce the so-called veils.
The reaction conditions and a table showing
the admixture contents before the reaction,
after the reduction and after the carbide for-
mation are presented. (Iart 1: Petrdlik Y.
Sbornik vyzku:lnych praci ministerstva huti a
dolu. SNTL, Praha 1957).
Card 3/3 17

-,7

PETRDLIK, M.
Theoretical studies on the pressing of powdered metals according to
M.I. Balshin. P. 17#
CjL
SOVETSKA VMA- HUTNICTVI, Prague, Vol- 3, no. 1, 19.54.
SO: MmTthly List of East Europ?an Accessions, (ERAL), Lr3. VoL No.
June 1956. Uncl.

PE-TiDLIK, Fl.
Dufek, V. Effect of carbon an the -uality of carbides sintered )y the 'd('-,o
systelae p. 528.
HUTNICKE LISTY, Brno, Vol. 10, no. 9, Sept. 19~5.
SO: Monthlj List of i~ast European Accessions, (--.i~AL, , L(;, Vol. 5, tiio. 6 June 1956, Uncl.

A"
AUTHOR: Gayevskaya, G. N. 50-2-22122
TITLE: Conference of Young Expertsof the QxMbnial
Observatory imeni A. I. Voyevkov
(Konferentsiya molodykh spetsialistov Glavnoy geofizicheskoy
observatorii im. A. 1. Voyeykova)
PERIODICAL: Meteorologiya i Gidrologiya, 1958, Nr 2, pp. 61-61 (USSR)
ABSTRACT: This conference tock place from October 28 th - 29th, 1957;
assistants of the Leningrad University, of the Arctic
Scientific Research Institute, of the All-Soviet Institute
for Plant Breeding and others took part in it. Lectures were
held by young scientists of the conference. A. S.
Grigorlyevals lecture on "the Horizontal Synchronizing Pulse
in the Atmosphere" dealt with the computation of the
atmospheric coefficient on various isobar surfaces with re-
ference to the air ourrent.
L. P. Spirinals lecture dealt with the forecasts of the
monthly temperature anomalies with reference to the inertia
laws. N. A. Timofeyev reported on the calculations cf show
melting. On the strongth of the known laws by Prandtl and of
Card 1/3 the stage law by 1D. L. Laykhtman, a formula for the

Conference of Young Experts of the Win Gogh Ical
n Obftr-ftt-017 50-2-22/22
imeni A. I. VoXeykov
computation of the heat-exchange between anow surface and
atmosphere with reference to thermal layer formations was
obtained and the computation nomographs were represented.
The lecture of Petrenchuk, Q. P. "The Frontal Structure of
Anticyclones" de-~lt *in detail with the structure of mobile
and steady anticyclomes as well as with the atructure of the
troposphere above these. 0. 1. Golikova reported on the
measurement of spectral coefficients of brightness on
laboratory Gonditionn.
Mrs. 0. 1. Golikova (The Earth Radiation Meter with Wind
Shield Filter") and I.. I. Gulyayev ("Methods of Observation
of the Plant-Physiolcgical Radiation") reported on the
development of new actinometric apparatus and the
perfection of the existing devices. k method for the
detection of the radiation balance according to certain
measured values of the summary radiation was suggested by
L. B. D'yachenko in his lecture "On the Connection between
the Radiation balance and the Total Radiation".
R. L. Kagan reported on a better approximated solution of the
Card 2/3 equation of the light dispersion according to the method of

S/226/62/000/001/013/014
1003/1201
Authors: Petrdlik, Miroslav and Shtrobl, Yaroslav.
Title: SINTERED STEEL ALLOYED WITH COPPER, NICKEL AND CARBON.
Periodical: Poroshkovaya nietallurgiya, no. 1(7), 1962, 88-92
Text: The authors studied the effect of the addition of nickel, copper and carbon powders to steel powder
on the properties of the resulting sintered alloy. The cffect of various alloying elements is shown on a three-
dimensional diagram representing the dependence of tensile strength and hardness of the sintercd allots
on their content of alloying elements. The addition of nickel raises the strength of sintered steel. especially in
the presence of copper. A metallographic investigation showed that the structure of these alloys consisted
chiefly of ferritic grains. The addition of copper inhibits the grain growth of ferritic grains and promotes the
growth of the iron-nickel phase. There are 2 diagrams, 3 micro-photographs and I table. Ref. includes no
7 S. R. Crooks, Metal Progress. 74, 6, 68, 1958.
Association: Institut poroshkovov metalurgii, Praga (Institute of Powder Metallurgy, Prague
Submitted- August 20, 1961
Card 1/1

AUTHORS:
TITLE:
PERIODICAL:
Z/013/60/000/002/001/001
D007/DlO2
Dufek, Vl., Engineer, and Petrdlik, M., Engineer
Hot-pressed semiconductive ignitron ignitors
Skl&~ a keramik, no. 2, 1960, 44 and 46
TEXT: The article describes a nethod of boron carbide ignitron
ignitors production which combines pressing of the powered semicon-
ductive material, and subsequent firing in a non-oxidizing medium,
with simultaneous bonding of the ceramic body to the metal stem.
This pressure-sintering, or hot-pressing method, so far only seldom
used in the 6SSR, was applied by the V~zkumny ist 0 d6kovou
~ av pr pr
metalurgii (Research Institute for Powder Metallurgy) in Vestec to
the production of an ignitron to be installed in an electronic weld-
ing apparatus developed by tho V,kzkumn~ U'stav zvAra6sk~ (Welding
Research Institute) in Bratislava. The boron carbide ignitor (Fig.1)
consists of a ceramic body which extends into a mercury pool and a
molybdenum stem for current ad-mission. In production tests, the two
conventional methods, i. e., pressing and firing, were combined into
22686
Card 1/7

22686
Z/013/60/000/002/001/001
Hot-pressed semiconductive... D007/DlO2
a single process by using a resistance-heated graphite die (Fig. 2).
The heating current was applied to the graphite electrodes of the
die thru water-cooled copper terminals from a 15 kVA variable-voltage
transformer, with the secondary voltage adjustablO in 0.1 V inter-
vals within a range of 3 - 12 V. The boron carbide body was heated
and simultaneo-fisly pressed by a. double-sidea hydraulic press, with
the pressure applied to both the male and female dies. To avoid
short circuits within the press frame, at least one die must be
insulated by a porcelain plate. The temperature of the graphite die
was measured externally with an optical pyrometer. When 0the desired
temperature was reached, it was kept constant within � 5 C for a
certain time by adjusting the transformer voltagq. After this time,
the current was cut-off and the pressure released. The sample was
left in the die to cool off. As the last operation of the pressing
process, the pressure on the female die was increased to achieve a
complete filling of the die cavity resulting in a perfect shape of the
ceramIc body requiring no additi:)nal grinding. Temperatures of
2,500'0 and more can be achieved with the equipment used, but pres-
Card 2/7

226Q,6
Z/013/60/000/002/001/001
Hot-pressed semiconductive... DOOVD102
sures are limited by the streng--h of the graphite dies and should
2 at surf
not exceed 1 0 kg/cm aces perpendicular to the pressing
direction. pressures were precisely measured with gages installed
on both cylinders. Production tests were performed with semiconduct-
ing materials containing boron. carbide (of East-German and Soviet
origin, both of similar quality) mixed with aluminum silicate
Al 0 3SiO
2 Y 2 (a product of Merck~,. Optimum composition was found to
be 550LD C, 35 - 40016 Al203* 3SiO
PP4 2, and 5 - 10% Zr02; optimum sinter-
L
Ing temperatuse (measured on the surface of the graphite die) was
1,320 - 1,340 C to be maintained for 2 minutes. To test the quality
of the ignitors, ignitrons were ignited by the discharge of a 1
microfarad capacitor, and the adequacy of ignitors for use with
ignitrons was established by measuring the dependence of ignition
voltage on electrode immersion in mercury. The regularity of igni-
tion was checked by comparison on an oscillograph. The ignition
voltage, adjusted to the limit of dependable ignition at each
immersion, was measured with a peak voltmeter. Measuring data, as
Card 3/7

22686
Z/013/60/000/002/001/001
Hot-pressed semiconductive ... DOO?/DlO2
obtained with these ignitrons, are listed in Table II. The pro-
perties of the Czechoslovak ignitrons are similar to those of a
Phillips ignitron. In conclusion, the author states that pressure
sintering proved a suitable method of producing intricate ceramic
bodies. The products proved successful in tests and enabled the
perational, all-metal welder i nitron at the VfJS in
building of an q 0--
Bratislava. There are 3 figures, 2 tables and 2 references: one
from the Soviet bloc. The reference to the English-lanpage publica-
tion reads as follows: USA, pat. 2, 456 .891, December 3948.
ASSOCIATION: Vftkumn:~ u'stav pro prd6kovou metalurgii, Vestec
(Research Institute for Powder Metallurgy, Vestec).
Card 4/7

FRMDUK., M.
PETRDLIKv M. Technology and properties of materials iwnufactured by - power metallurgy.
P. 101
Vol* h. no, 3. Muo 1956
STROIJIFUMM VYROBk
TECHNOLOGY
Praha# Czechoslovakia
So: East European Accession Vol. 61, no. 2. 1957

DEI-
i i"DLIE, 1.7.
Powder metallurgy an,i the -r-3iu-!ti 3n of meta L pD,.,j-ier in thr'. ne:), I e,
democratic countries. n. NtAC,'~, Vol. ~, No. 11. 1,)v
1956. 3ratislnvp, Czechoslovakia)
~~J: ~,:)nthly List of Last -~-urope,--.n itnces!tion-, LC, Vol. 6. No. I,-', I-ec [Ircl.

PETRDLIK, Y. ; DUF;-..',', V.; HRUSKA. J.
I a:)-
Optirrwr speed of hentinF nnd cooling in sinterinC- hrr-H "D
(pUr~:jCwE LIgTy, Ir
ailoys. D. 617. oL. 12, 1 -). ?, July 195,7, Jrno,
Czechoslovakia)
53: Monthly List -3f East Lurorean Acces!,i,:)ns (!-4LAL) LC, VOL. 6, N-). 12, 'Lec 1-)57- Uncl.

I I . . - 0

rThbe Ot -w of
11 iitid-- At ',it r
Ivre- c Allro~
av
val *,,Ynki "'i,
;,,,l it fit the VP 75 thel
n We v~ 4~ ~41
-j.1lidivil. dinterb - ,-
btitid NVrAV.4A Ig III
11 alop it, lqWj. w1al C,-Xim viccarWitintion
A
lii)r mify-Ass 0:1 V-(~ C, Ific 11mWilli jvt rcvarlwrlscd~
'Flit, 0 cou)1A;lc4 w1tv Co
upou the- Q-virw vi ill Cttbut I trm fiot -t .1wryed",
'ril -i the'
Siatt Mfiij pt WC wil bmt a 1; nder hl~,%hen
o--i AwAX kppmaLtl t1w lite..
:Ability wheP it-jillt 11a, of tile S)~tvla
cc, with 2-0 u.1 101" L~, h ~-", Iculul atat tiv, 1gst p~,Ys.
p"'pstieb drc 'Ittabl"I me - ta We is fwar
to lim swrA~j(~ t.tric Val= I I'v -q;:1, ~j 3"4
ti,jw* 61A4
t;"aur.JJv:Aor,4L-at s in

"VX1., the hiiiAl t,~!N.k i, IZF'
41

ST it, N' v A.

'Me Produtdon of I -Powders H
~nd*etal
Reduetim fln Czech.)
LWV, Y. 5, Mar. 19W, pi I
Exa mines in druil con Allions for complete reduction
- III
f W
M
C
C
l
F
by h ogen of the exi
t es o
n,
u,
,
A
%
,
and By this methot) finely-grained metal powders
i
to an elec-
are obuiniA The reduFtion is carried (nt
tric tube furnace wfthi two temperatur: zonev. The
l Mows continuous!y throual,
msterial being roduce
,
the furnace in the pile dIrectJon to the hydrogem
=
d of calculating vmter-rapor
Also presents a
coDcentration in the rvducing a"licre from con-
ditions in the furnace, 1 and a calculatim of composi-
tion of the sedum lioducts of vartatts devees.of.
oxid Won number.
oxidation based on
----------

Distri, 4Vc/4E3c/4E3d
MmiWactwo cl PaUd voluft= of -mtltft carbi
4Y.V, sav-Dirub. 1939),-Any carbWes vlbkh out hc~
The 9DW. am prcpd. by hmtlng tollethrr as fim
m3= under preum the md cabiles. such as
+ MC, It.is prefen-ed In thh cam to produm them
both toplber in me redwtion, WO: + T1% + 7C -,71C
+ WC + 0 CO. It is swt necemry in sueb redwdom to
stat with the 04dej of both mWji,- W + + 4C
!nC+ WC+2COvrWC + Ti%+SC - TIC+ WC+
2CO. Wemw Jambson

x1
Powders reduced by hydrogen at ow
o"d Co, Cm. aild Te by rc4lucLion with 1i of Cc
am,. cmide. Cu citinte. rtc. 'Me p4mder obtained
was subjected to n Vresiure of 4 tonsIng. cm. and sinterad
for I by. as foll"s: Co at IlM*. Cu at 860', and Fe at
11001, Beat results were obt2lued when the reduction was,
stiowlemp. NVIcn the rMuction lemp. ma too biqb the
particles Increased In site owing to madensation and their
kflace moothed mt niviag to s4Willusion; this, in turn,
their ~inlcrabllity. lltdu~tian to Co wai mrrird
m"ased
suited in 'Vickers;
at redLaixi at 3D)' rei
PCs 4
CV) bf thi Prodort 199 (fran CO formAtt) skr.4 19
'*ldi), 4csp., and YrdLction at 700' rmulteil in
Reductio"4tnCuwa%at45()'-8W'. Altl;ougl.the
powder obtained U 4&0* co;italnm) O~ 1M nud at
0.04%, the sintdab'dity of.th, powd; Cu was best whz'n the
red ction as Cailkd CLIFftf Gr (AY SlightlY above
The sarnk applied ~~o Co alid Fe. ~ As to the C rontml~ P.
fbu~d. h&-- the low~T the rphiction trmp. tLe greater the C
if ihe final~pibduct~(C Orighu'lvd from the org, Yaks). r?
odurt ol)Wned'ftom reduced nt an,]
t an'-l kMfl' I
T ml
UV

PETRE P A.
"Fatigue of metals" by St. Nedeshan [Nadasan, St.), B.
Khorovits [Horovit, B.1, A. Bernat, V. Safta. Reviewed
by A. Petre. Rev mec appI 3 no. 6: 1114-1115 163.

FnFF A.
:=L~
Application of electric analogies to the study of vibrations of elantic media.
P. 505 (Academia Republicii Populare Ronine. Institutul De Mecanica Aplicata. STMITT SI
CERCETARI DF MFCAWICA APL'CATA. Vol. 7, n:). 2, Apr./June IQ56- Pacuresti, Romania)
Monthl,,- Index of E,?st European Accessions (FT-AI) LC. Vol. 7., no. 2,
Fetruary 1958

ONIN5 U~
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NOR, X
44,
RIM Q
V54--J.
too- c
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ly-
Lz

PEME, A.
An experimental verification of the classic method for computing wc*dorn wings.
P. 1303.
academia Republicil Populare Rordne. Institutul de klecanica Aplicata.
STUMI SI CERCETARI DE IMECINICA APLIC-ATA. Bucuresti, Rumania. Vol. 8.
no, 4. 1957,
Mon 113t of East Rlropean Accessions (EEAI) IZ, Vol.8, no. 8, Aug. 1959
uncle

Petro, A.
Curved thin-walled bars. p. 1013.
Academia Republicii Populare Romine. STTJDII SI CERGETARI DE MECANICA APLICATA.
Bucuresti.. Rumania. Vol. 9, no. 4, 1958.
Monthly List of East European Accessions (EEAL) LC Vol. 9, No. 2, January 1960.
Uncl.

"0-0
o G~~
AUfff-OR:
TITLE:
PLRIODICAL:
24272
R/008/61/000/003/002/003
D218/0301
Petrel Augustin
Aeroelastic vibrations produced by alternating vortices
V
Studii 91 cercetari de mecwiica aplicatVa', no. 3, 1961,
511-518
TEXT: The article deals with calculating slender structures such as
hanging pipelines, tall smoke-stacks, towers, etc., the radial sym-
metry being the main element from the aerodynamic point of view. If
such a structure presents radial aerodynamic symmetryl the vibrations
produced are due to the Bgnard-Kfirmhn alternating vortices. The load
due to the 13'e'nard-K&rm5Ln vortices distributed along the pipelines and
normally acting at the speed of the wind, may be expressed by
P - D VAc. am"+ in which P is the mass of the
2 fluid's volume unity, D- the
external diameter of the structure, V - the wind speed, c k - the
Klm&n coefficient which may be considered : c k = 11 while W is given by:
Card 1/4

Aeroelastic vibrations...
Ck
Ir
0,22~iy 1,38 -
D D
24272
R/008/61/000/003/002/003
D216/D301
The frequency (2) of the dis-
turbing load (1) depends on the
i,,-ind speed, hepce for V 50m/sec
(2) M
one obtains:
W = 69 1 -1 , in which D was considered in meters. The resonance
D
danger in such conditions can-not be eliminated and the whole problem is
reduced to determining the maximinn amplitudes and stresses. Since the
vortices can progressively detach along the pipeline, the dephasing ?
can be taken as continuous function ~! = C (,-() (3) The function1p (x)
should be selected in such a way that a distribution of the load in
phase with the corresponding oscillating module should result. The
author then gives the transversal displacement in which the dimensional
factor is included in the unknoun time functions Tn(t), and the kinetic
energy of tht elastic system. In case of horizontal structures tile
motion equation has the shape of'
Card 2/4
(For (22) see next card)

Aeroelastic vibrations#**
OJ2 TO + W! T. - 0,
0,112
2h272
R/008/61/000/003/002/OC3
D218/0301
in which K I expresses the
(22) bending rigidity, K',, -
1~2 d2X, + (K3 - 1W.2) X. = 01 the eventual existance of
de suspension cables, and
K .; the similar effects of
the elastic medium. The function 1, n will generhly hnve the shnpe of
In case of vertically
X. (x) = sin 11 X + A. eos-51! + B. A + C, eh (23) located structures,
the effect of tiie
structure's own
weight also interferes.. For such structures, there results the re-
lation in which P is the axial
02 + + 0, force. The author finally
U-M-5, (El ex Ox Ott (33) presents a calculation ex-
ample of a horizontal
cylindrical structure, suspended on both ends. There are 4 references:
3 Soviet-bloc a nd I non-Soviet-bloc, The reference to the English-
-language publication reads as follows: R.L. Bisplinghoff, H. Ashley,
Card 3/4

R/008/61/000/003/002/003
Aeroelastic vibrationsooo D218/0301
and R. 11alfmann, Aeroelasticity, Addison-Wesley P.C., 1956.
ASSOCIATION: Institutul politehnic, (11olytechnical Institute) Bucharest
SUMITTED: February 11, 1961
Card 4/4

297al
D238/D3o4
AUTHORS: Petre, A., Sta"nescu7 C., and Librescu,
TITLE: Aeroelastic diverCence of box-beam wirivs, t,)1`n1' into
consideration the fastening, restraInts
PERIODICAL: Studii ~:; cercetawri de mecanica" aplilcata,_n~).
1061 7~_5 - 764
TEXT: The article present's a solution of the problem of aero-
elastic divergence in the case of lifting surfaces of a constant
cross-section taking into consideration the spanwise moment
and the effect of the fastenin:, restraints. Starting w4u~h the
h:.,pothesis of A. A. Ur-anskiy 2? Abstracter's note: Uiransl~liyl s
hypothesis not stated-7, according to 1which the longitudinal
motion u(y, s), in case of impeded twisting, is proportional tc,
the w (s) motio'n of 'he free twisting, the authors deduce
U(Y, s) = W(s) U)
Card 1/7

27421
B/008/61 /000/004/'J(,~ /'C
Aeroeias~i!- diverrenceeove D238/D')O4
I -i
in which Y (s) is -a f-Linction v~ich has to be determilned,
y and s are variable values a'.ongy the span, andalong the conzouz-
of the transversal section, respectivel,'r. On the base ~,~ z:--`s
equation, and taking the method of Gaierkin into consideration,
the authors deduce the fundamental eqn~)tion of impeded tw!E:AnC
,W. A 2.
+ - "~&-
4- C, I r,
in which T is expressed by:
GId
V* being the de-levelling coefficient defined b, Ebner5 GId
rigidity to the free twisting,lf the twisting angle, I. tale llner-
tia. moment', and mt the twisting moment distributed along ti.e span.
Card 2/7

Aeroelastic divergence..@
Z'Abstracter's note: the
while the Galerkin method
chord with c he dis'ance
of the aerodynamic centers
q E V2, and the gra~,ient
2
0 MA I
R/O 1/ooo/oo4/002/003
D238/D304
other s:,,mbols of (8) are not defined,
is not sta'ed.7. Denoting the win-
betieen the elastic axs and t~,r
line
wit1i e, the dynamic pressure with
of the lifting curve with dCz I the
di
differential ecuation of the aE.I.-oelastic diverf-ence in ca--c- of
impeded twisting rray be expres::ed by
C14 CP J Cz.
+ -rL7-
CLC 11 Jc z
CI Je
A
Card 3/7

t7421
R/009/61 /000/00LA)"~/-
Aeroela-tic diverpenceove D238/D3o4
Considering
dc (13)
Lf 2-
to be the zerc-dimens- &I paraineters, the equation (11) ciianres
into
4 xjv
cj~4
The solution of this e t Ion is
9 SIT? Cc ~+(:,, C o5 .4- C
3
Card 4/ 7

F-7421
R/008/61/ooo/oo4/002/003
Aeroelastic divercence..# D23F/D304
in which c( and P are expre~;sed by:
A-(l-v)X-I+yk2(:t-v)'IX2+2k(l+v)X+l
M = v 2k (16)
,.V-k(l-,)X+l+llk2(1-v)2X2+2k(l+v)X+I
2k
The integrating constants C.1, C * Cand C4 amy be determined on
the basis of the following uWO ~OndRions: 1) The conditions:
0 and u = 0 W)
-Cird 5/

t7411
R/008/61/ooo/ooVo02/003,
Aeroelastic divergencee-0 D236/D304
have to be satisfied at the fastening section of the wing; and
2) the conditions:
lit = 0 and Y = 0 (23)
have to be satisfied at the ftee end of the wing, lit being the
'tvristing moment. The authors finally deduce the fundamental
equation of the aeroelastic divergence of single-box-beam wings
of constant cross-section, taking into consideration the fasten-
ing restraints:
2 k vd'r (28)
chVi-k(l--v)X+V-.C2(1-:::-v)'XI+2k(l+v)X+I
_L_ 2k
-vV!-_X[k(I-v)X-I1x
'I_v)sX2+2k(I+v)X+I
x sin - x
lk
Card 6/7

10('-200
33739
R/00 61/000/006/001/UO5
D272%304
AUTHORS: Petrej Augustin, and Stanescu, Cristian
TITLE: Aeroelastic distribution of aerodynamic loads for
lifting surfaces of constant cross-section, taking
into consideration. the end restraints
PERIODICAL: Studii pi cercet9ri de mecanic~ aplicatd,~no . 6, 1961~
1193 - 1203
TEXT: The problem of designing the structure for distribution of
the aerodyanmic loads to correspond to a deformed flexibie struc-
ture is discussed in the case when the flight velocity is below The
critical divergence velocity. In this case the increase of the
twist and of the lift are convergent, reaching a state of stable
equilibrium, and the problem of finding the load distribution on a
wing span, corresponding to the condition of stable equilibrium
The solution of this problem is presented starting from the equa-
tions of the theory of restrained twist of thin-walled rods with
closed prorilep adding the hypothesis of non-deformaole cross-see-
Card 1/2

33739
R/008/61/000/006/uO1/',jO5
Aeroelaotic distribution of D272/D304
tion. By introducing a parameter, it wav possible to derive the rf~-
iation for the torsion pair, and that for the torsion angle. li~ir-
ther derivations, after introducing the distance between the elas-
tic axis and the line of the aerodynartic centers, and the aistance
between the elastic axis and the line of the gravity centers enab-
led the authors to obtain linally the differential equation wh-Ich
conditions the aeroelastic distribution of the load in the span, VA
taking into consideration too, the effects of the end restraints
which is further simplified by dimensioniess parameters and then
solved obtaining two roots. For practical cases, the ratio of the
iif-. distribution to that of %he rigia wing has been calculatea-
,xhere are 4 figures and 3 references.- 2 Soviet-bloc and 1 non-So-
viet-bloc. The reference to the English-language publication reads
as follows: R, Bisplinghoff, H. Ashley, and R. Halfman, Aeroe'Lasti
cityj Cambridge, 1955,
Card 212

PETRE, Augustin
"Nonlinear oscillations of the elements of rmchines and
buildings" by N. V. Grigor'lrev. TWA&wed by AuguatIn Petre.
Studii cere mac apl 13 no.1:254-255 162.

PETIUF, AugustIn
In t~-e ~ o f~ -3 j,
I I . oformatic;r, c,' ~,,jrs 6;1 th 'hir, walls find :1 ~ s- pr cf 1.14~
3tudil carc moc apl 1" n,,,~,325-3)7 ' 64 .
1. Submitt.ed Decc-rrb-3r ?, l.c63,

PETRE, Augustin (Bucuresti)
Torsion bucklIng bars with thin mil-fe"m unitar the action
of axial loadsI unif ormly ar I in o tr ~r tstributed. Bull
matn Rum 6 no.,/2:61-78 "62. jpufi-4. b4].
1. Submittee January 15, 1963.

N
i) JT
.7
--50(y M)019/(4/*/*/1335/1350
br -
ft VeWss-' th"considetatioh' of
--V
6
ce
i_ ailiq, ue appuqueeft
-1350
335'
0 - - .--f--~06 -~ad is -feet
ef
vom
Oro
TO tldi;~~IIAIV r6d TWdiffc-reu-
e IL' of the pwoblem As J.iqUb ishiA. juA., JUtegrated Amder the. assunp
-q
#on
u- sea'- b- -t= on a
''s resses-norm
'4z al-'- to the Jsrosrj -section ca are, proportior A.
bet-ween:.tM
il6n velq~city of ~tobe~air--~.--
tudi=l-' dxI-
tIIdI-defIdctUh:'vV+~he VAI-ag' ailerons for 'a
al-
vt m ay e CIL
F
For ~i urreri I
va Ueo-Of ieswhicb characterize

PETRE, Augustin
Duckling of forced condits due to internal pressure.
Rev mec appl 8 no. 6: 971-5,80 163.
1. Insitut Poly-technique cle Ducarest.

PETRE,, Augustin
Buckling of forced coaduita due to intemal proasure. Ft.). Audii
core mac apl 14 no.L27-36 163.
1. Inatitutul politelmic Bu::uresti.