SCIENTIFIC ABSTRACT YASTREBOVA, I.P. - YASTREBTSEVA, T.N.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R001962230008-0
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Document Release Date: September 1, 2001
• Sequence Number: 8
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

PATIL, Surendra J.- YASTEWYAO I.P. [translator); .12TKPANOV. L.V.. redaktor;
IOVUffA. rodaktor.
(Agricultural laborers in modern India and Pakistan. Translated from
the Ingli shl Seliskokhostaistvennyo rabochie v Indit i Pakistane.
Perevod a anglilskogo I.P.IAstrebovoi. Predislovie G.G.Kotovskogo.
Hooky^, Izd-vo inostrannol lit-ry, 1955. 197 P, (KW 9:5)
(India-Agritultural laborers) (Pokiatan-Agricultural laborers)

YASTMOVA, I.P.
111hibit of school chemical apparatus. Xhin. v shkole 10
no.6:76-77 I-D 155. (MLEA 9:1)
(Chemical apparatus)

DANTSIGt B.M,t otva red.; SIIPIRTq A.Yu.t otv. red.1 YASTREBOVAp I.P.p
otv. red.; DIZHURt I.M.p red. izd-va; Z(YfOVAt YV'.IT-.p"We."TtdL
va; YUREVICH-P' L.I.f red. izd-va; EMSLAVSKAYA, L.Sh.9 tekbi.
red.
(Economic conditions of Asian and Arrican countries in 19591 Eko-
nomicheskoe polozhenie stran Azii-i*Afriki v 1959 9. Hoskvaq
lzd-vo voBtochnoi lit-rir, 1961. 509 P. (MIRA 14.- 9)
1. Akademiya nauk SSSR. Institut na-r'odov Aiii.
(Africa-Economic conditions) (Asia-Economic conditions)

POTEKHIN, I.I., glav. red.; BARANOV, A.N.j red.;.BELYAYEV, Ye.A., red.;
GELLER, S.Yu., red.; GRAVE, L.I., st. nauchnyy red.; GRIGORIYEV,
A.A., red.; GUEER, A.A., red.; KULAGIN, G.D., red.; MALIK, YJ.A.,
red. MANCHKHA, P. 1. , red.; MILOVANOV, I. V., red.; NERSESOV, G.A.,
red.; OLIDEROGGE, D.A., red.; ORLOVA, A.S., red.; POPOV, K.M.,
red. ROZIN, M.S., kand. ekon. nauk, red.; SMIRNOV, S.R., red.;
UFIMOV, I.S., rod.; SHVEDOV, A.A., red.; YASTREBDVA, I.P., red.;
PAVLOVAt T.I., tekhn. red.
(Africa; encyclopedia) Afrika;-6ntsiklopedicheAk# sprdvoehnik'.
Glav. red. I.I.Potekhin. Chlany red. kollegii: A.N.Baranov i dr.
Moskva, Vol.l. A - L. 1963. 474 P. (MIRA 16:4)
1. Sovetskaya entsiklopediya, Gosudarstvannoye nauchnoye izdatell-
stvo, Moscow.
(Africa-Dictionaries and encyclopedias)

SVANIDZE, Ivan Aleksnndrovich; YASTREBOVA I -PU otv. red.; PAVLOV,
'T 9 e
A.G., red.; MIKHLIHA,
[Agriculture of Northern Rhodesia] Sel'skoe khozisistvo
Severnoi Rodezii. Moskva, Izd-vo vostochnoi lit-ry, 1963.
259 P. (MIRA 16;7)
(Rhodesia, Northorn--Agriculture-Econo4ic aspeets)

'qnvostigat',on of tho :hy.,dco-Ter.-hni.cnl. la'r)p~rttar, or 33o-c In
Tr-,,-Iy 5-III'll, :o 5 (17) 1~11C (11'1~-13-7)
SO: U-3039, 11 "ar 1953

KLINOVA,X.V -prof .;SOLOV IYNV,V.F.;ARTTUNOVA,N.M.; POPOV,P.G. YASTREB(NAL.A.;
BAMIN,V.P.; KCPYLOVA,Te.K.;TBCDCROVICH,G.I., red~kt2o~7~,Vftf-.
A.T., akademik, redaktor; KIRONOV,S.I., akademik, redaktor;ALIM,
M.j(.. redaktor; AXHMOW,G.A., redaktor; VARXIMN.M.I., redaktor;
DMITRIYBV,Ye.Ya., redaktor; DOMOPOLOV,N.N., redaktor; ILIIN,A.A..
redaktor; MIMIM Sh.Y., redaktor; MOZESON,D.L., redaktor; FUSTO-
TAIM,L.V., redaktor; FOMIN,A.V., redaktor; HOSOV,G.I., redaktor;
KISKMA.A.A., tekhnicheakiy redaktor
[Recent sediments of the Caspian Bes,] Sovremennye osadki Kaspiiskogo
morla;-_Moskva,, Izd-vo Akademii nauk SSSR, 1956. 302 p. (MIRA 9:3)
1. Deystvitellnyy chlen AN AzSSR (for Aliyev) 2. Chleu-korrespo~dent
AN SSSR. (for Varentsov, Pustovalov) 3. Ilachallnik morskogo otryada
Azerbaydzhanskoy neftyanoy ekspeditsii SOPS AN SSSR (for Klenovs.)
(Caspian Sea) li

. ~ - 1
Cjz
1,143
I
R

AUTHORS: Ravich, M. I., Yastrebova, L. F. SOV/78-3-12-27/36
TITLE: The Phase Equilibria in the System Na 3P0 4-Na2so 4-H20 at 2500
(Fazovyye ravnovesiya v sisteme Na 3 PO 4-Na2 so 4-H20 pri 2500)
PERIODICAL: Zhurnal neorganicheskoy khimii, 1958, Vol 3, Nr 12,
pp 2771-2780 (USSR)
ABSTRACT: The solubility of the system Na 3PO 4-Na2 so 4-H20 at 2500 as well
as the solid phase which forms at this temperature were in-
vestigated. Two phases with varying composition were found. The
a-phase contained 24-45% Na 2 so 41 and the P.-phase contained
0-15% Na2 so 4' The a-phase is characterized by the refractive
index, which varies with changes in composition from 1.480
(37% Na 2so 4) to 1.489 (24% Na 2so 4) . The P-phase is anisotropic
and is characterized by its refractive Index, which also varies
with the composition: N
= 1.489 and N
= 1-494 (at 15%
,,
p
. 1.495 and N
= 1,510 (in the absence of Na 2S0
) and N
Na2so
1
4
4
g
p
The X-ray studies made show that the two phases belong to
Card 1/3 different crystai systems. From the radiographs it is apparent

SOV/78-3-12-27/36
The Phase Equilibria in the System Na 3PO4 -Na2 SO4-H20 at 2500
that for the a-phase a change in composition leads to a con-
version to Na 3PO 4* The thermograms cf the a- and P-phases
show thermal effects which correspond to the dehydration. In
the dehydration the a-phase remains isotropic, although the
refractive index decreases down to -1-46o-i-471. In the de-
hydration of the P-phase (with more than 10% Ila 2so4) this
phase also becomes laotrapio. The X-ray studies of the isotropic
samples, prepared by dehydration of the a- and P-phases, are
practically identical and do not differ from the X-ray pictures
of the non-heated phase. In the crystallization of the a-phase
no excess of alkali was found, but, on the contrary, with the
crystallization of the P-phase Ila 3 PO4Na 2S04 9 and Na2 HP04
crystallized out simultaneously. With an increase in the
Ila2so4content the amount of Ila 2HPO4in the solid phase becomes
less and the alkalinity of the liquid phase decreases. With a
Na2so4 content of 14% the amount of Na 2HPO 4 present is zero.
From the results obtained it follows that the sodium phosphate
Card 2/3 and the BOCUUM sulfate form two double salts, the isotropic

SOV/78-3-12-27/36
The Phase Equilibria in the System Ila 3P0 4-Na2so 4-H20 at 2500
a-phase and the anisotropic P-phase.
There are 10 figures, 3 tables, and 9 references, 6 of which
are Soviet.
SUBMITTED: November 20, 1957
Card 3/3

5(2), 5W
AUTHORS: Ravich, M1. Lp Yastrebova, L. F.__ SOV/78-4-1-32/46
TITLEs On the Solid Phanes Cryatalliztng In the Na 110 -Va SO If 0
3 4 2 4- 2
System at High -'emperatures (200-3500) (0 tverdykh fazakh,
kristallizuyushchikhsya v sisteme Na 3PO 4-Na 2S0 4-H20 pri
vysokikh temperaturakh (200-3500))
PERIODICALs Zhurnal neorganicheskoy khimii, 1959, Vol 4, Nr 1, pp 169-181
(USSR)
ABSTRACT: The heterogeneous equilibrium in the Na 3 PO 4- Na2 SO4-H20 system
0 0
was investigated at 200, 300, and 350 . At 200 the
solubility of Na.3PO4 is higher than at room temperature. In
this system the isotropico/- phase and the anisotropic P phase
0 0
phase of approxi-
crystallize at 200 and 250 At 200 the
mately constant composition (14-15% Na2SO 4 is an almost pure
anisotropic double salt. The.solid phases were investigated
by crystallo-optical, radiographic, and thermographic analyses.
At 2000 there is no Na 2 HPO4compound in the P phase. The
Card 1/3 results show that at temperatures higher than 210 0 the

On the Solid Phases Crystallidng in the Na PO - SOV78-4-1-',12/45
3 4 0)
-Na2 so 4-H20 System at High emperatures (200-350
anhydrous Na 3P04 salt is crystallized from aqueous solutions
of Na PO . At temperatures lower than 210 the semihydrate
3 4
Na 3 PO 4' 1/2H 20 crystallizes. The semihydrate does not form
solid solutions with Na 2HPO 4' At 3000C the same solid phases
crystallize as at 250 0: Na 2so 4) o~. arid ppha'se. In the 0 phase
the amount of Na 2HPO4SO is reduced in the same way as at 250 0
with an increase in Na 2s04 content; and with 14-15 wt.%
Na 2s04 there is no more Na,EP0 4* The existence of theo":
tj
.,AUTHORSt 'Andreyev., V..A.; Kl shchel, T. F j Tastrebtaev,.,~. iloyp F.':
j .1
ORGt none
LW
TITLE.-)~Machine for loadingp,transfer, and unloadinZ of long loads. Class 63j 5~
No. 17W20 &nnounced by Komi State Dep~g and Scientitic Research Institute of
Forestry (Komi gosundarstvennyy proyektnyy i nauchno-issledovatellskiy inatitut
lesnoy promyshlonnosti)7
SOURCE: Byulleten' izabreteniy i t6varnykh znakov, no. 20, 1965~ 126
TOPIC TAGS-. automation equipment, transportation equipment, transportation
equipment industry, material handling
ABMACT t This Author Certificate presents a machine for loading, transfers and
unloading of long loads$ consisting of a self-powered chassis and an attachment
containing a powered frame which can be rotated in the vertical plane and which
has load-gripping arms (see Fig. 1). To permit changing the location of the
rotating frame and to improve the stability during load transfer.- power cylinders
03490.377.o1:621.868.238.6

L 9791-66
AGO NRs AP5028533
0.
16 Fig. 1. 1 Rotating frame;
2 - self-powered chassis;
.3 - power.cylinder;
h - carriage; 5 - clamping
arms
2
9
are-pivoted under the frame at the rear of the chassis. The piston rods of the 0 1
-frame. The load-grippin
cylinders are connected through.pivots to the rotating 9
device consists of a carriage with a clamping arms The carriage can translate
along the rotating frame. Orig. art. has: 1 figure.
SUB CODEt 131 SUM DATE: 3oju:L64

KAVENSUT, Mikhail Anm,--;I--Ak- OFENGPX*DLT, Alir"i Vikhaylovich;
FOYNISS, YASTEERMV, lo~;Af
Fedor~wieh
[Open-hearth furnace hearth bottom] Pod;-na r-artenovskoi
pe:!hl. Moskva,, Metallurgi.la. 1965. 88 p. (MTRA 18.7)

YASTUBTSEVP V. M.
KOSOMOV, Nikolay Yvacheslavovich
61j
Mlekbanizatsiya Ucheta Ila Sudostroitellnom kredpriyatii (mechanization
of accounting in shipbuilding enterprises, by) N. V. Kosovanov i V. N. Yas-
trebtsev. lzd. 2. Moskva, lzd-vo I'RecMoy Transport", 1956.
126 F. Illus., Diagrs., Tables.

J.

z4
V
1948
Oncillatorsp Transitron
Oscillations- Relaxation
"StuAy of a Relaxation Oscillator of the Tranaitron
Types" V. V. MIgulin and T., N. Yactrebtso-ra, Sai R,5s
Inst of Pbys, Moacov'State U, 12 pp
"Zhu'r Tekh Fiziki" Vol ZYMp No
Reports trVerimental study of-tranaltron oharaoter-
16tics of-62h7 -tube, and7,*a:rIcus-performanoeis ofRS-
oscillator vorking on this tube. quaitative exami-
nation of processes In a similar system gireo results
in agreement with experiment. Submitted 24 NOT 1947.
75T34
IME

T.
t!
it
12
("cot"' Oltler or TC,nin
~.,So - f~i,-, 117"'l-
Dis ffZlla~~jf -qCL#-)fC-L-
scicnC0 nm(!
SO: SAL,71. ),!'0 a rj) 0 r:

Card 1/1
Author
Title
Periodical
Abstract
Institution
Submitted
~vigatiori FD-2676
Pub.' 90-8/12
: Yastrebtseva) T. N., and Galkin, 0. P.
: A method of damping the natural oscillations of quartz
Radiotekhnika, 10, 69-73, Jul 55
: The problem of damping quartz crystal oscillations arises from the
necessity of obtaining exact calibration marks on radar range in-
dicators, when radiated pulses lack strict periodicity. An ex-
perimental investigation is described of a rapid method of damping
natural oscillations of quartz (Q of several teas of thousands and
frequency 8xio5 cps), by connecting the electrodes of the crystal
to the input of a negative feedback circuit at the right"time. In
the experimental apparatus natural oscillations were shifted 1800 and
fed into the feedback channel (for which an amplification factcr of
700 was chosen), producing full damping in less than 100 cycles.
Diagram, oscillograms. One English reference.
June 26, 195k

F_ b-T S V_V fj N
SUBJECT USSR / PHYSICS, CARD I / 2 PA - 1494
~AUTHOR JASTREBOEVAIT.N., AKOPJAIT,I.G.
,_TITLE ..Tbe.,11nvestigation of the Impulse Excitation and Forcible
tz,Oscillations.
Extinction of Quai
~PERIObICAL Radiotechnika, 11, fase. 9, 39-45 (1956)
Issued:' -.10 / 1T56 reviewed: '11 1956
Uodern impulse technique makes use.of installations which generate the electric
time scale..Here.the accuracy with which time is measured is determined by the
stability of the generator of the scale Graduations. Several works deal with the
conservation of scale graduations by means of a quartz resonator. In view of the
fact, however, that hitherto such works have been characterized by a number of
defects, the present work is devoted to a theoretical and experimental examina-
tion of the impulse excitation of quartz oscillations as well as of some methods
,of forcible extinction. A complete solution for excited oscillations was found for
the case in which a signal with rectangular impulse acts upon quartz. The optimum
duration of the impulse, in the case of which the excited oscillations have the
greatest amplitude and the lowest number of higher harmonies, is determined. Four
methods of forcible extinction of quartz oscillations were investigated:
a) furnishing quartz with an active shunt-resistanoe, b) extinction in a scheme
with negative feedback coupling, c) extinction by means of an equilibrium scheme,
d) impulse extinction. It was found that, with the help of the two first mentioned
methods, the extinction of the quartz oscillations can be raised by only one order.
Computations and experiments carried out by means of an equilibrium scheme have

Catepry iUSSR / Radio Physics. Generation and Conversion of 1-4
Radio-Frequency Oscillations
Abs Jour :Ref Zhur - Fizika Ho 3, 1957, No 7271
Author :Yp~qti~qbtsp
ya, T.N., Akopyan, 1,G.
Title :Investigation of Shook Exoitation and rorced Quonchin- of Quartz
Oscillations,
Orig Pub :Radiotekhnika, 1956, 11, No 9, 39-46
Abstract :A theoretical and experimental investigation of shook excita-
tion of quartz is described. A comDlete solution is obibained
for excited oscillations in the Gaze of a stop signal and a
rectangular pulse actin:r on the quartz. The optimum duration
of the pulse under which the excited oscillations have maximum
amplitude and a minimum of harmonies is establixhed. Four me-
thods of forced quenching of the quartz oscillations are in-
vesti.rated: shunting the quartz by an active resistance, quen-
ching in a negative-feedback circuit, quenching-witi the aid of
a balanced circuit, and shock, quenching, It is ostablis~od
that the first t-uo methods can increase the attenuation of the
Card 1/2 - 19

Category : USSR / Radio Physics. Generation and Conversion of 1-4
Radio-Frequency Oscillations
Abs Jour : Ref Zhur Fizika No 3, 1957, No 7271
quartz only by one order of magnitude. Calculations and oxpe-
riments on quenching of quartz vrith the aid of the balanced
circuit proposed in this article have shovm that this method
can increase the attenuation of the oscillations by a factor of
4
10 . In addition, by a pemanontly connected feedback loop it
is possible to reduce artificially the 0. of the quartz to any
required value. The balanced circuit developed for the excita-
tion and quenching of quartz oscillations is suitable for prac-
tical use.
Card A
20
109-9-7A5
AIPMR: Yastrebtsevat T.N.
,TITLE: Analysis of a Bistable WltivibratOr.ftplOYing Junction
Transistors (Anaill spuskovoy skhemW na ploskOstnfth
pauprovodnikovkh triodakh)
PARIODICAL: Radiotekhnika i Flektronikat 1957t V01'.II? Nr 9V
pp.1146,- 1156-(USSR)- m a
AIPTHACT: The multiVibratOr considered is of the grounded e itt r
type (see Fig'.1)'. positive triggering pulses are applied
through crystal diodes to the base electrodes of the tran
istors. Firsto the static analysis Of 'the system is carried
out'. For this purpose the equivalent circuit of the multi-
vibrator is as shown in Fig'.2'. Operating currents and volt-
ages of the circuit are determined under the following assto-
tions: (1) the.collector potential of a oonduoting trans-
istor is,very near to zeroy.(2) the base potential of a con-
ductixg transiptor is very near to zeroo (3) the initial
emitter and oolleOtOr OUrzents of a nonconducting transist6r
are negligiblej and (4) the collector and emitterresistances
(rk and are much higher than .Rk, ELO and JR6'. The

109-9-7/15
Analy sis of a Bistable Ifultivibrator Employing Ju tion Tran istors.
referring to Figs. 1 and 2. 'Aiialysis of the transient pro-
cesses or changeover of the multivibrator is 'carried out by'
means of the equivalent circuit shown in Pig.4. The change-
over from one stable state to the other, upon the application
of an external trigger pulse,, is investigated by splitting
the processes into a number of stages. During the first stage
a triggering pulse is applied to the base of the conducting
transistor. During the second stage the nonconducting tra-n -
istor is being gradually opened as a result of the feedback
and the disappearance of the triggering pulse. -Both trans-
istors are conducting during this stage but one of them is
being gradually closed while the other is being gradually
opened. During the last stage the transistor which was pre-
viously conducting is fully closed. Analytical expressions
describing the operation of the system in the first 'and the
third stages are given (see Eqs'.(13), (17) and (21)) and an
equation for the rise time of the leading edge of the
collector current pulse is found (see Eq.(22)). The above
expressions are rather complicated but they can be employed
in practical calculations. The theory was checked on a
symmetrical multivibrator employing two Soviet typeII66
a transistors and was found to give values for the rise times
-Card ?/3

109-977/*15
Aralysis of a Bistable Vultivibrator Smploying Junction Transistors.
which were accurate to within 20%. There are 3.0 figuresp
out of which there are 3 sets of oscillogramsp and 2 non,
Slavic references.
ASSOCIATION: Physics Faculty of the Mosoow State University
, M Fakul'tat Mookovskogo Gosu-
m. V.- Lomonosov (Fizicheski
j
darstvennogo Universitata im. W.Lomonosoya).
SPMTTED: March It 1957.
AVAIIA=: Library of Congress.
_qard 3/3

YASTREBTSEA
Investigating the process of the Rjumpu in self-oscillating
relaxation circuits. Veat.Mosk.un.Seremateomekhop astrons,fiz.,
khim. 12 no.3:95-101 157. (MIRA 11:3)
l.Kafedra kolebaniy Moskovskogo gosudaratvennogo universiteta.
(Oscillators, Electro-tube)

(c Is mo 22 woe)

C..Wk-.

IL IL %"-"

W-ft W"- A. 30L fp-
p-
WX V. Wft L & NI-
L IL 1- 0 :r-.
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a UL OL A-.~
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IL A. ft- C. OL qj-
my-

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(c 145 ~.Cm)

wpm VA.%Ws at w0 D.SwAls %sty cc
seaw smatimmortme we llow%rW" ommmwmlam%l~ Is. A. S. F"m ("am), moon,

IF
77777

BENDRIKOV. G.A.; KRASNUSHKIN, P.Te.; REYKHRUMMI, B.M.; POTEMKIN, Y.Ve;
MUSTXLI, Te.R.; RUMIN, K.S.; ITAHOY, I.Y.; KHARLAMOV, A.A.;
TIKHCUOV, Tu.V,; STRZUOVA, L.P.; KAPTSOT, L.H.; ORDANOVICH,
A.Te.; KHOKELOY, R.V.; VOROHIN, B.S.; BERESTOVSKIT. G.9.; KRASHO-
FZVTSEV. Tu.V.; MINAKOVA, I.I.; TASTREBTSEVA, T.M.; SEMMOV, A.A.;
VINOGRADOVA, M.B.; KAFXEYEV, G.A'--'DRACHW"-I;.-A'.'; TROPIMOVA, N.D.;
SIZOV, V.P.; RUMIN, S.H.: VMIZHANIVA, K.A,; NESTEROV, V.S.;
SPIVAK, G.V., red.; NOSTREVA, I.A., red.; GBORGIUVA, G.I., takhn.
red.
[Special physics precticum] Spetsialinyi fizicheskii praktikum.
Moskva, Izd-vo Kosk.univ. Vol.l. (Radio physics and electronics)
Radiofizike i elektronika. Sost. pod red. G.V.Spivoka. 1960.
6oo p.
(MIRA 13:6)
1. Professorsko-propodavateltakly kollektiv fizichaskogo fakullteta
Mookovskogo universitata im. X.Y.Lomonosova (for all except Spivak,
Nomyrevao Georgiyeva).
(Radio) (Slootronics)

S/188/6,-/000/001/011/014
B164/B102
ALVHORS.- Yachukhashvili, G. S., Yastebtseva, T. N.
TITLE& -Investigations on- static and trans i ent--oharaot eris t 1-68- of
current switches
PERIODICALs Moseow. Universitet. Vestnik. Seriya III. Fizika,
aetrono-miya, no. 1, 1963, 66 73
TEXT: A current switch circuit with surface alloyed semiconductor triodes,
f-s analyzed theoretically and the results are compared with those of
experiments. Solving the diffusion equation for free carriers in the
triode base taking account of boundary conditions and circuit equations
gives analytical expressions for the volt-ampbre characteristics, from
the input
which the minimum input pulse amplitude for switching and
impedance can be obtained. Further the differential equation of the equi-
valent circuitis investigated taking account of the frequencyproperties
of semiconductor triodes. This equation is solve 'd under some simplifying
assumptions. The dependence of the switching time on the triode and
circuit parameters is investigated. The teaulto of'theoretical calculations
are compared with experiments on a current switch-cirouit with low
Card 1/2

S/186/.63/000/001/011/014
Investigations on static and... B164/BI02
frequencylT56 (F5B) triodes. Good agreement is obtained. There are 7 fig-
ures.
ASSOCIATIONt Kafedra teorii kol.ebaniy (Department for, Theory of
Vibrations)
SUBMiTTED: June 29, 1962
Card 2/2
MESA
ONSOM
OHM,
-0-M
ANN
M

ACCESSION NR: AP4043802 s/0188/64/ooo/oAgO83/oW
AUTHOR: Andronov, Yu. A. ; Anupy*]'d, A. Yu.;Yastrebtseva, T. N.; Gubankov, V. N.
T.ITLE:~ Oscillations In germanium samples with point contacts
SOURCE: Moscow. UnIversitet. Vestnik. Seriya 3. Fizika, astronomiya, no. 4, 19640
83-86
TOPIC TAGS: germanium, point contact, semiconductor
ABSTRACT: The authors present some preliminary results of an Investigation of os-
cillat,ilons in nr and p-germanium with plane and point contacts when the samples are
connected in a circuit of direct or pulsed voltage. Diagrams of the circuits used
for determiiinj oscillations and volt-ampere characteristics are shown.in Fig. I of
the Enclosure. The investigated samples of p-germanium had resistivitles of 2, 5,
10 and 70 ohm-cm; the resistivities of the n-germanium were 1, 7, 18, 39 and 53
ohm-cm. The samples were rectangular blocks measuring 1.5 x 2 x 10 mm. in no case
were oscillations observed in samples with plane contacts. The'point contacts were
made.of wire of various metals and alloys. The ends of the wires were sharpened
to a point electrolytically and had diameters of 5-100 11- Contact of the metal
point with the Investigated germanium sample was accomplished using a micromantpu-
&Sof ~6 Nonlinearity of the volt-ampere characteristic was caused only by the point

ACCESSION NR: AP40411802
conta6t. Typidal volt-ampere curves of samples are shown In Figures 2 and 3 of the
Encloiure. Ther;curves I correspond to an increase In current through the point con-
tact;.curves 2 - to a decrease in the current to zero. On the direct branch of the
curve1or n-ge~manium, the segment with negative transconductance is missing. The
direct'branch 8f a sample of p-germanium has a segment with negative transconduc.
tance'and the curve corresponding to a*n increase in direct current coincides In
most cases with the curve corresponding to a decrease In the direct current to zero.
In coAtrast toAhe results of earlier published studies, there was no evidence of a
region' of osciHations on the inverse branch of the volt-ampere curve of n-germanium
In the region W'Ith negative transconductance; no oscillations were observed on the
direci,,branch of the volt-ampere curve. In samples of p-germanium oscillations
were observed 'only on the direct branch of the curve In the region with negative
trans6nductance. The oscillations observed in samples of n-germanium are con-
iderably more~istable in frequency and in amplitude than the osciiiations in San-.
t
s
pies of p-gerrr~dnium. Among the metals used in the point contacts were Fe, III, W,
ith;Mo, W with Al, Cu, Al, Au with Ga and Pt. In all cases the volt-ampere
W wi
curves.had the~shapes shown in Figures'2 and 3 and oscillations were observed in
all cases. The frequency of oscillations In samples of n- and p-germanium varied,
depending on the sample, from 0.1 to 1.5 mc/s. In most cases the frequency of os-
cillations.in n-germani,um was lower than in p-germanium. With a decrease In tem-
Card 2/6

ACCESSION NR: Ap4o43802
perature~in p-ty0e germanium the amplitude of the oscillations decreased, disap-
of -150C. Orig. art. has; 3 figures.
pearing:at a te
ASSOCIATION: Eafedra fIzIki kolebaniy Moskovskogo universiteta (Department of
Vibration Physics, Moscow University)
SUBMITTED: 7.4Dec63 ENCL: 03
SUB CODE: EC NO REF SOV: 001 OTHER: 002
Card 3/6'