"SCIENTIFIC ABSTRACT LYAPICHEV, P.A. - LYAPIN, A.G."

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December 31, 1967
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SCIENTIFIC ABSTRACT
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- LYAPICT ~11 V, -P. A. - Cand. Tech. Sci. Dis,sertation: "Basic T~jprzq of Run-off Ref,uliAlnn for a Several-Year Period." Mo3scow Order of Lenin Power Enf,fineering Init imeril V. M. Yoloto-i, 10 Oct 47. SO: Vechernvaya Mloskya, Oct, 1947 (Project #17836) 0 1. LYVI * 11"! L' - V, P. .1. 2. USSR (600) 4. Technologi 7. 'Water power regime in a hydroelectric oower station with amnual regulation of flow. I Moskva , Gosenergoizdat, 1952. 9. Monthly List of Russian Accessions, Library of Congress, April -1953. Unclassified. LYAPICFW Petr Andreyevich KAPLINSKIY,S.V., kandidnt tekhnicheskikh nat r. dAkt or; BARSOV,M.Y., redaktor; MLTVRW,L.Yq., teani- cheskiy redaktor [Method of controlling river flow] Metodika regulirovaniia. rech- nogo stoka. Moskva, Gos.izd-vo lit-ry po Btroit. i arkhitekture, 1955. 389 P. (MIRA 9:2) (Rivers--Regulation) SIDORDY, A.A., kandidat tekbnicheakikh nauk, redaktor; BLIZWAK, Ye.T. doktor tekhnicheakikh nm3 , professor; OLESHKEVICH, L.V., kandi- dat tekhnicbeekikh rail , doteent; AKUTIN, A.R., doktor tekhai- cheskikh nauk, professor; BMWINSKIY, A.R., doktor tekhnicheskikh nauk, professor; GRISHIN, K.H., doktor tekhnichookikh nauk, pro- foosor; DZHUNKOVSKIY. N.N., doktor tekhnlehkeskikh nauk, professor; ZHM6GHKIN, B.H.. laureat Stalinskoy prenii, doktor tekhnicheakikh nauk, professor; MIKAYLOV, K.A., doktor tekhnicheakikh nauk, pro- fessor; NICHIPEROVICH, A.A., doktor tekhnicbeekikh nauk. professor; NESDUM, F.Ta., doktor tekhnicheakikh nauk; NBDRIGA. V.P., kan didat tekbnicheskikh nauk; SAMNOV, P.V.. inzhener; LATTSHMOV A.M., kandidat tekbnicbeskikb riauk,dotsent, redaktor; MUROMOV, V.S., kandidat tekhnicheakikh nan , dotsent, redaktor; BARSOV, M.V., inzbener, redaktor; MNSTIM, V.A., kandidat tekhnicheakikh nauk, redaktor; LIPKIED, H.V., kandidat tekhaichesklkh nauk, redaktor; LYAPICHEV, P.A., kandidat tePhnicbeekikh nauk, redaktor; P.BPOV, I.M.- [Knnicheakikh asuk, dotsent, redaktor; IN, V.P., insbener, redaktor; M3DV3DlV. L.Ya., tekhnichaskiy redaktor. [Wdraulic englneerlng handbook]Spravochnik po, gidrotekbnike, Moskva, GosAzd-vo lit-ry, po utrolt. i arkbit.1955. 828 p. (MIRA 8:10) 1. Moscow. V9esoyuzWy usuchno-issladovatellskiy institut vodoenabzhenlya, kanalizateii,, --idrotekhnicheakikh soorazhegiy i inzbenernrT gldrngemlogii. 2. ZasluzhezWy deyatell mu i i (Continued on next card) SIIY)ROV, A.A., kandidat tekhnicheskikh nauk, redaktor,and otberm... (Card 2) Ellydraulic engineering handbook]Spravochnik to gidrotelchnike, Moskva Gos,izd-vo lit-ry, po stroit i arkbit. 1955. 828 p. (Card 25 (MLILk 8: 10) 2. ZasluzheMy deyatell nauki I tekhniki RSFSR(for Blionyak) 3.-Deystvitellmy chlen Akademli nauk AzSSR(for Milckylov) (Elydraulic engineering) LYAPICHEV, Ye.G., starshiy elektromakhanik This yields good results. Avtom., telem. i sviaz, 4 no. 12:26 D 160. (MIRA 14:1) 1. Kotallnikovskaya distantsiya signalizatsii i avyazi Severo- i KaAmzekoy dorogi. i - (Electric lines--Poles) --;;, - - LYAPICHEV, Ye.G.,, starshiy elektromakhaaik ------------------------ Change in the design of a welding clamp. Avtoa.- telem,i sviaz~ 6 no.4;39 AP 262. 0141PA 15t4) 1. Kotellnikovskaya distantaiya signalizatsil, i svyazi Severo.,Kavkazakoy dorogi. (Welding-Equipment and supplies) WT 'T' -jp(c~ jpl o46 X /L* ACC NRz AP6010099 SOURCE CODE: UR/0129/66/C,00/003/0060/0062 /V )i AUTHORS: Arkovenko, G. I.; G37,ekov, N. A.; Lyapicheva) N, F,; Sazonovaj T, u, ORG: none TITLE: Relaxation.~6f tensions in titanium alloys, as a function of.hot deformation conditigns . j -t) -1-1 1 ~/ SOURCE: Metallovedeniye I termicheskaya obrabotka metallovp no. 3, 1966) 60-62 TOPIC TAGS: titanium alloy, metal grain structure, metal deformation / VT3-1 titanium alloy, VT-2J+ titanium alloy ABSTRACT: The influence of temperatureend degree f deformation on the relaxation of tensions in the titanium alloys VT141and VT3-llwoas studied. The chemica 'I composi- tion, the usual mechanical proporties, tho grain s ize and grain structurej$and the microstructure of the alloys were investigated. The exporimental results'are pre- sented in graphs and tables (see Fig. 1). It was found that the deformation of alloys VT3-1 and VT-14 specimens in tho P -region leads to a formation of coarse grains and to a decrease in the relaxation stability. Lowering tho daformation tom- parature to the ('A + P )-region yields, upon deformation, a more homogeneous s tx%cture and leads to an increase in the relaxational stability. The alloy VT14 Is more sensitive to hot deformations than is alloy VT3-1. 1/2 UDC: C-69.245:539.371 L o4631-67 [-A'CC NR: AP6010099 Fig. 1. Relaxation of tensions (for cylindrical specimens) at 100C and C-0 = 0.65UO.2 for VT3-1 and 0.70 0'0.2' for VTIJ+ as a function of the testing time, heating temperature during forging, and degree of deforma- tion during final heating stage: dashed curve allay VT3-1; solid curve - alloy Orig. art. has: 2 tables and 3 graphs. SUB CODE: l1/ SUBM DATE: none 13/ 11~ - M 14 . 12 10 1 8. >0 - 6 . 4 tesiting-. time awm rd 2/2 LAKHINO P LYAPIDEVSKIYY O.P. [!Aapidevs'W,,, O.P.1; VETaov, O.P. [Vietrov, O:vp: I -- - Methodology of the graphic recording of the quantity of biological fluids. Fiziol.zhur. [Ukr.] 10 no.1,2558-560 Jl--Ag .164- (MIRA 18:11) 1, Ins titut fiziologii im. Bogomoll tea AN WzSSR, Klyev. LYAPIDU,VSKIY. S.S.; SIDME'Ll, A.G. Stammering. Med.Bestra 18 no.9:30-35 S '59. (MM 12.':Ll) 1. Iz Goaudaratvennogo nauchno-iseledavatelolkofo instituta ukha, gorla i nose, Ifini8terstva zdravookhraneniya lib'PSI1, Moskva. (STAMERING) PRAVDINA, O.V.; MKLMOVA. L.V.,* IVANOVSKAYA, V.A.; TAPTAPOYA, S.I.; ALKAZOVA, A.I.; LTAPIIM'MIT, S.S., red.; NOVIKOV, Ya.A., red.; DRANNIKOVA, M.S. ;--V6Rb-n-.r-e-cT.- [Essays on the pathology of speech and of the voice] Ocherki po patologil rechi i golosa. Pod red. S.B.Liapidevokogo. Moskva, Gon.uchebno-pedagog.Izd-vo H-va proov.RVSR. No.l. 1960. 148 p. (MIRA 13:12) 1. Moscow. Moskovskiy gosudarstvennyy pedagogicheskiy institut. (Speech, Disorders of) ZEYEMAN, Miloslav[Seeman Miloslav] prof doktor med. nauk; SOKOLOVA, Ye.o.ttranslatori; TRUT'NEV, V.K., zasl. deyatell nauki, prof. (deceased], red.; LYLPJJA_V~KjY, _S,.S._' dots., red.; YAKOBSON, I.S., red.; ROMANOVA, Z.A., tekhn. red. [Speech disorders in children] Rasstroistva rechi v detskom vozraste. Pod red. i s predisl. V.K.Tintheva i S.S. Liapidevskogo. Moskva, Medgiz, 1962. 298 p. (MIRA 16:6) Translated from the Czech. (SPEECHj DISORDERS OF) (CHILDREN--DISEASES) LYRND-VS-Kly V K: FD 412 USSR/Physics Ph6toconductivity Card 1/1 Author : Krongaus, A. N., and Lyapidevskiy, V. K. Title : Negative photoconductivity of cuprite Periodical : Zhur. eksp. i teor. fiz. 26J. 115-119, Jan 1954 Abstract : Investigate the influence of an electric field and intensity of light on the photoconductivity of cuprite. Establish the presence in cuprite of both negative and positive photoconductivity. For increasing light in- tensity at given voltage in a crystal the negative photoconductivity increases, reaching its maximum value. Increasing the electric field with light intensity unchanged leads to increased values of negative photoconductivity. Results of a study of the temperature dependence will be published in separate articles. Institution : State Scientific-Research Institute of Roentgenology and Radiology ~Submitted : March 17, 1953 _ZqQ~ 0 USSF/Playsics Ionization cbamber Card 1/1 Pub 146-13/22 Author Lyapide,vskij, V. K., and Shcherbakov, Yu. A. Title Study of the operation of a diffusion-condensation chamber Periodical Zhur. ek6p. I teor. fiz.) 27, 103-109, Jul 1954 FD-7113 Abstract The operation of a rectangular diffusion-condensation chamber filled with air and alcohol vapor at atmospheric pressure was studied. Analysis of the vertical temperature distribution re- vealed that the heat exchange with the side walls of the chamber is a decisive factor. The chamber was found to work steadily at various temperatures. Photographs of ionizing particles are pre- sented. Indebted to M. S. Kozodayev. 6 foreign references. Institution Moscow Engineering Pbysics Institute Submitted August 5, 1953 LUPDAVSKIT V Allww,: I Instrument for the observation of ionized particle tracks. Fiz. v shkole 15 no.lt47-50 Ja-F 155. (MLU 8:2) l.' In2henerno-fizicheakiy institut, g.Mosk7a. (Ionization chambers) -)IN I IV T USSR/Pfi-ysics- Diffusion-condensation chamber FD-2i-.,65 Card 1/1 Pub. 146 - 26/26 Author : Lyapidevskiy, V. K. Title : Investigation of the field of partial pressures in a diffusion- condensation chamber Periodical : Zhur. eksp. i teor. fiz., 29, August 1955, 263-264 Abstract : The saturation distribution in the volume of diffusion chamber, and consequently the height and quality of the sensitive layer, depend upon the temperature field and upon the partial pressures field. The temperature field in the volume of a diffusion chamber was investigated by the writer (co-author Yu. A. Shcherbakov, ibid., 27, 103, 1954) and others (H. Morrison, G. Plain, Rev. Sci. Instr.' 23, 1952). In the present note the writer describes the procedure and results of measure- ments of the field of partial pressures, for which a special device was constructed, a diffusion chamber with expansion (cylindrical vessel with glass walls, the bottom of the chamber consisting of two brass disks held by screws,and cooled by liquid nitrogen passing through a spiral channel cut out in the upper disk). He thanks M. S. Kozodayev and Professor M. F. Shirokov. Two references. Institution : Moscow Engineering Physics Institute Submitted : November 1, 1954 LYAPIDT;VSKIYJ# V. K. Lyapudevski-r., V. K. -- "Investigation of the Physical ProcesseS in a Diffusion-Condensation Chamber." Min Higher Education USSF. Moscow Engi- neering-Physics Inst. Moscow, 1956. (Disseration for the Degree of Candi- date in Physicomathematical Eciences). So: Knizhm,,,a Letopis', No. 11, 1956, PP 103-114 ' 711 lard coord d toi, - ~ V;esdt- Lhamt mra. in diam., wul I , and-M mra, L.A-, IL: 46ftorm J w4icfft wai cvur Wit " Ili Gi;&. "pts., tbx a W. cooted to voxj,~s timmps,. th-.~ bo-tum Lciri& lidd at a Corst. bight-T"t=lp". tho 6'm'm c3t'--J t- ttr-,p-. Tilii:eoiZio caa~;Ci air-~ vaptir in Oie -1 SWIW't te The pmsitlm vval deul. at which 'hiatian atia a c%3nit. typc of Czitivect6a were ferLched. dh#n ush v~ cfepeadlxls".em me W~ tliulp- a - dx. - ' k-it hidka* -; it, wis pte,~Yfth3v Or ~:&amuictL, '0. aiir u found (1) kt a given Of UiC with vapur r~ula d fb~"u it 1-nual ImIIT~S' the temp, C t ~~C of tilt, tGp~ and b~z t~~ az. V~c it aihnol y C~C-Ci iriz:;' ~'~S w 1-th the 1:tizi .(:L)-at a gitr-a b:!iz1tt- Olf 0!e Of 06 dwifli-K".r, -d a L c1l'imbtr az tl=-11'~ (fie (fq, thi, ktaliffity vrt~iurc j q. -W increase,- wit'; flie. terup. Of tcq~ (ffcccaiZ7' 0.1 tht~ temp, dielit in tb~ 0113ru Lt. 2~ lt:u! d bwlpw~ the ' , et, a pum=. t"WUL. The- Hquid Ili ofjhava% *Ad a st tux betO u id thi bouam. abauba.-Teathava'aft ev M4 *a , WO.X am- st - .~ LYAPIDBVK V.-YIX6 ...... Formation of a cellular structure in i teor. fiz. )0 no.2:399-400 7 136. lo Hookovskly Ins ener-n--6--Micheskiy (Oondensation trail) fog or smoke layers. Zhmr. eksp (MLRA 9:M inatitut. /- y LYAPIDEVSK.IY.1- V-LLWTIS11INP V.-M. Investigating partial pressure fields in diffusion cloud chambers. Prib..i.tekh. eksp_.-no.1:48-49 Ja-F t57. (M12A 10:6) 1. Moskovskiy inzhenerno-fizicheokiy institut. (Cloud chamber) AUTHOR: Lyapidevskiy, V. K. 120-2-10/37 TITIZ:-3~A~_plfication of Th-e-D-iffusion Chamber to the Determina- tion of Small Activities. (Primeneniye Diffuzionnoy Kamery dlya Opredeleniya h1alykh Aktivnostey.) PERIODICAL: Pribory i Tekhnika Eksperimenta, 1957, No.2, pp. 37 - 39 (USSR). ABSTPACT: The difficulties in determining small activities when using particle counters may, to a large extent, be avoided by using the diffusion chamber for recording radiation. The author gives results of measurements of a-activity using a diffusion chamber. Two mthods are described: in one the sample is at the bottom of the chamber, in the second it is placed in the region where supersaturation is less than unity. It is shown that using the first method, both the absolute sample activity and the vapour stream may be determined; the second method per *ts the de termination of activities of the order of 10 iL~ curies both for a- and P-preparations. A formula for the evalua- tion of the particle stream with the camera in a stationary regime is given by equation 1, where C is the act~'Vlty of the sample, It is the a particle range in mG,/cm , h is Card 1/2 the distance from the source plane to the sensitive layer 120-2-10/37 -An Application of the Diffusion Chamber to the Determination of Small Activities. in mg/cm2sec., t i2 the time in seconds and f is the flow of vapour in mg/cm see. Schematic drawings of the diffu- sion chamber and of the chamber for determining the activity of the sources and two graphs of the counting speed versus time for two measured samples are given. Wil. f~artishin has helped in cons-traction of the apparatus, PA.S. Kosodayev has assisted in the theoretical side of the Work. There are 3 Slavic references. SUBMITTED: May 11, 1956. ASSOCIATION: Moscow Institute of Engineering and Physics. (bloskovskiy Inzhenerno-Fizicheskiy Institut.) AVAIIABLE: Library of Congress. Card 2/2 AUTHOR: Lyapidevskiy, V.~~. 1'0-3-30/11.0 TITLE: Diffusion Chamber with a Transparent Base (Diffuzionnaya kamera s prozrachaym dnom) PERIODICAL: Pribory i Tekhnika Dilks-perimenta, 1957,. Nr 3, p.103 (USSR) ABSTRACT: The instrument is designed for the observation of tracks of ionising particles. In order to be able to project the 0 tracks-on a screen the base'and the cover of the chamber are made from transparent materials. The diffusion cham- ber (Fig.1) is in the form of a cylindrical vessel 100 mm in diameter and 60 am high. The base of the chamber con- sists of a layer of liquid, 6 (ethyl aicohol), which is poured onto the glass plate, 7. The liquid is cooled by special.walls made of copper (lower part, 5) and of plexi- glass (upper part, 4). The walls of the chamber are cooled by solid carbon dioxide placed in the container, JL~. The lid of the chamber is made of brass and contains a -lass window. The temperature of the lid is controlled by an electrical heater. In order to prevent icing of'the outer surfacel special thermal insulation is provided in the form of three closed air spaces, 8. A humidity transmitting material (filter paper) is used as the source of va-pour and is placed on the inner side of the cylinder. Tlie liquid at Card 19: 120-3-30/110 Diffusion Chamber with a Transparent Base. the bottom of the chamber rises up the filter paper, evap- orates and diffuses dovmviards, making sure of a continuous functioning of the instrument. The chamber is illuminated by means of a 300 watt lamp. It is placed at a distance of 5 to 6 meters from the screen. When the liquid layer is cooled, convection takes place and is clearly visible on the screen. In the steady state (10 to 15 minutes after the introduction of the solid carbon dioxide) the supersaturat- ion near the bottom of the chamber becomes sufficient for the condensation of drops on ions to take place. Using this instrument it is possible to observe on a screen seD- arate drops formed on condensation centres, as well as tracks of a and 0 particles. Trials carried out at indus- trial exhibitions have shown that it is possible to ob- serve (x-particle tracks on a screen in an auditorium in daylight. The author wishes to acknoviled-e the i,,'U'-erest of M.S.Kozodayev in this work and to thank A.M.Konstantinov for 11is help in the construction of the instrument. Card 2~1' V AUTHOR: -_LYAPIDEVSKIY_,V. ERGLIS,K. PA - 2319 TITLEs Devices for Nuclear Physics. (Pribory dlya yadernoy fisiki, Russian). - PERIODICAL: Atomnnia Energiia, 1957, Vol 2, Nr 3, pp 291 - 292 (U.S.S.R.). Received: 4 / 1957 Reviewedt 5 / 1957 ABSTRLCTt At the department for experimental methods of Nuclear Physics of the Moscow Institute for Physical Engineering investigations have been carried out for some years which concern the registration devices serving the purpose of ionizing radiation. The most important properties of the diffusion chambers were in- vestigated, and some types of chambers for physical investigations, measuring of small activities and for purposes of demonstration were developed and built. As a device for demonstration the diffusion chamber, if compared with the WILSON chamber, offers the advantage of uninterrupted action. The chamber with a transparent bottom developed by the above mentioned department permits the observation of traces of c(-particles and electrons on a -6 m2 screen. A new type of diffusion chambers permits the measuring of radio- activities of the order of magnitude of 10-12 curie with high statistical accuracy because these chambers concentrate concen- Card 1/2 tration onto the surface of a preparation introduced into the Devices for Nuclear Physics. PA - 2319 chamber. One of these chambers for the determination of low activities will be on show at the All-Soviet Industrial Ex- hibition as well as at international exhibitions. ASSOCIATIONt FUSEN= ZY: SU13MITTEDi AVAILABLEt Card 2/2 The development of large diffusion chambers raises several problems. At the department mentioned above the2construction of a diffusion chamber with a surface o5 6oo x 900 m (the reviewer believes that this should read 6 x 9 m ) was developed in which an uninter- rupted vapor flow is supposed to act. This chamber contains plates on two walls opposite to each other which conduct the moisture. Furthermore, an experimental amplifier with drive correction was developed by means of an ampiifier with contact transformer by the department mentioned above. he application of contact transformers in electrometric amplifiers is useful only in the case of using current intensities of at least 10-11 a (with respect to the full scale of the device). (No illustrations). Not given Library of Congress. 14A P ip E Vs K 1,/ AUri-1116R: KRONGAUZ,A.N., LYAPIDEVSKIY,V-K., DEYEV,-'1-S- 56-5-10/55 TITLEt The Pho tocondue-f-i~v~-y--o-r-Cu-,-O-.--tPo to pro v oJimo st I kuprita, Russian) PERIODICAL: Zhurnal Eksperim. i Teoret. 2.1q ziki,1957, Vol 32, Nr 5, pp 1012 - 1017 (U-6-6-R-) ABSTRACT: '2he light of a mercury vapor lamp is sent through a monochromator with quartz optics and focussed on a Cu 20 crystal which is fixed between two electrodes, which are connected by a sort of bridge circuit with a rectifier as current source and an oscillograph and a galvanometer as indicating- and measuring device respective- ly. The curves concerning the photoconductivity in dependence on the wavelength of the inciding light show for negative conductivity a maximum at 6400 R and for positive conductivity a maximum at 4200 R, inasmuch as the crystal was illuminated with low intensity. Also in the case of the investiCation of the temperature dependence of photoconductivity a maximum could be found both for positive and for negative conductivity. It was further found that if a Cu 0 crystal that had already been irradiated with li,,,,ht and which has a maximum negative photocon- ductivity is additionally irradiated with X-rays, its negative Card 1/2 conductivity diminishes, and even positive conductivity may de- The Photoconductivity of Cu 20. 56-5-10/55 velop. If irradiation is carried out in the reversed order, an increase of negative photoconductivity is observed. -Y and Radiology ASSOCIATION: State Institute for Roezituefjolog PRESENTED BYP SUB:JITTED: AVAILABLE: Library of Congress Card 2/2 pi lot Ed a a 011 o jl-jq.~ 14 , 'H A 1- 1 RM w,P3 a ON W Igo ci F E2;:Mffl- 09 1 r, I i j -.- ; .- -40 H .1 CL 0 ;*-1 .4 F" or v 4 -ia o, 8 4o ;1 0v, ao ?113 'i -0 , ~,, h- i - I .0 V-0 .0 00 , 0 S~ft 4 ZEE n.0 0 . a~ 4 r - D:j I* pr n -9 4V0 'is -0- .. ~". 0 I own 0 F o 4 W M10 0. 0 0 c . 0 FO so 0 0 go 0c n 0 -0" -09" CD (7 //1 YX 7 GUSAROV, IsIo. aspirant., LYAPIDEVSKIY, V.K., kand.fize-mat.nauk Method for measuring natural radioactivity of the air by products of radon fission. [with summary in Suglish]. Gig. i Gen, 23 no.10:10-16 0 158 (MIRA llsll) 1. Is I Moskovskogo ordena. Lenina meditsinskogo inatitut imeni I.M. Sechenova i Moskovskogo inzhenerno-fizicheakogo instituta. CAm, natural radioactivity determs by rAdon fission products (Rua)) (RADIUM, radon fission prod. in determ.. natural radioactivity of air (Rua)) AUTHOR: Lyapidevskiy, V. K. SOV/53-66-1-6/ii 4.~ TITLE: The T~s ~a~.er-~Diffuzionnaya kamera) FiMIODICAL: Uspekhi fizicheskikh nauk, 10,58, Vol. 66, 1[r 1, pp. 111 - 129 (USSR) ABSTRACT; By means of foreign publications and by his o,,-.,n numerous. papers in this field the author gives a survey in the present article on the problems of recordinG ioniziriC particles in diffusion arid cloud chambers. The first section deals with the physical processes in dii'fucion chambers, the influence of the condeiisation upon the temperature distribtition and the distribution of the partial pressures; the effects are discussed by means of many diagrams. The followinC sections deal with the char,-e of the ions and the dead time, the direction of diffusion, similar chambers, low pressure cha,,.-ibers 20 - 30 torr), the sensitive stratum, the control system photomultipliers FEU), arid the constractive particul-ars of diffu- ~ sion chambers (the coolin(, of the bottom of the chamber, t1te vialls of the chamber, the steam source, the chamber illumination, Card 1/2 the application of photo-plates in the diffusion cha-~iber)- The Diffusion Chamber SOV/53-66-1 -6/11 Finally it is stated that the diffusion charabers comparei ;vith th+loud chambers exhibit a number of advanta.-es, i.articularly in work with accelerators and for absolute measure!-.ients of a- and P-activitics of an order of 10-12 Curie. They are api-li- cable in many ways, above all for investiaations of .-as dis- charges, for the investi-ation of t,!e behaviour of charL:ed droplets in the electric and in the -ravitational field, for the investi,,~ation of the process of formation Lind growth of droplets or also of monocr,,3tals in the seed of condensation, for the investio-ation of the scaLterin- of lilght, at dropl~!ts, of the interaction of accelerated particles -.Ath matter, etc, There are 15 figures and 41 references, 19 of which are Soviet- 1. Cloud chambers--Design 2. Cloud chambers--Performarice 3. Cloud chambers--Control systems 4. Particles--Recording devices TITLE: Diffusion Chambers Card 2/2 30/120-59-41-8/50 KUTHOR: Lyapidevskiy V K. TITLE: The Convection Chamber -' a New Instrument for the Observabion of Charged Paxticle Tracks PERIODICAL: Pribory i tekhnika ek5perimerta, 1959. Nr 4, pp 49-53 and 1 plate (USSR) ABSTRACT: A description is given of a r;onvection chamber whose principle is similar- to that of the diffusion chamber. The difference between the two lies in the fact that in the case of the convection, chamber ther-. is a temperature difference of up to 8000 across the bottom of the chamber. As a result of this temperature difference cowj-ective motion is set up and the vapour is moved from tLe periphery to the central portion of the bottom and forms a sensitive lsj~-,r a few mm high. The chamber is shown scab emat "'L -ally ir. Fig 1. The bottom of the chamber consists of two parts. The central part 1 is made of a good conductor and is cooled to -600C. Wear the walls the bottom of the chamber 3 is marle of a bad conductor. The walls of the chamber 2 are at approximarely room tem- perature. The vapour is provided by a layer of alcohol 7 Card 1/3 SOV/120-59-4-8/50 The Convection Chamber -- a New Instrument for the Observation of Charged Particle Tracks The vapour is transferred from the periphery to the centre of the chamber by convection and the liquid condensed on the central part collects near the walls. Data are given on the temperature distribution (Fig 2), the partial pressure distribution (Fig 3), super saturation, and the rate of flow of the gas. The chamber can be used for the demonstration and measurement of low-.activity solid, liquid and gaseous speci- mens. Figs 5-9 give typical photographs obtained with the chamber. The chamber can be used 'to record both very high and very low particle fluxes. The chamber may.be modified so that the wox-king volume is in contact with the atmosphere. In the latter case it jgy be i:zed to determine the activity of the atmcephere (10- a curie/litre or more). Acknowledgments Card 2/3 SOV/120-59-4-8/50 The Conve-c-tion Chamber - a New instrument for the Observation of Charged Particle Traoks. are madp,.to M1. S. Kozodayev, A. M. Konstantinov, V. I. Ani- simuvp-, T. M. Bogacheva and Ye. Ye. Minayeva. There are 11 figures and 2 Soviet raferen,3es. ASSOCIATION: Moskcvsk-iy 1nzhenerro-fiz-L!iheski,7 tasidut-C Moscow Institute of Enginevring and Physics', SUBMITTED: -Ame 69 1958. Card 3/3 AUTHOR: Lyapidevskiy, V.K. SOV/120-59-5-34/46 TITLE: On the Work of a Low-pressure Diffusion Chamber PERIODICAL: Pribory i tekhnika eksperimenta, 1959, Nr 5, pp 131 - 132 + I plate (USSR) ABSTRACT: The diffusion chamber which was studied was described by the author in Ref 1. It was shown that a reduction in the height of the sensitive layer, as the presnure decreases, is connected with a change in the partial pressure and the temperature distribution. The first is important in chambers with a very non-linear tempera- ture distribution along the walls and the second fri chambers with almost linear distributions. Figure 1 shows the distribution of temperature in the chamber. Curve 1 refers to atmospheric pressure inside the chamber and Curve 2 to a pressure of 20 mm. Hg.(the temperature is plotted along the vertical axis and the distance from the bottom along the horizontal axis). Curve 2 shows a similar plot for another temperature distribution over the walls (non-linear). Another effect Cardl/2 discovered was that at low pressures inside the chamber >_11, SOV/120-59-5--34/46 On the Work of a Low-pressure Diffusion Chamber fluctuations in the drop background took place. The sensitive layer divides up into cells. A typical i '3hoto- graph of the sensitive layer is shown in Figure 3 (opposite P 134). The cells appear at pressures lower than 200 nwi H9. When the pressure is reduced to 30 nua 11g, the size of the calls is reduced and then begins to increase again, At a rxesBuro of about 10 nim HS, both charged-particle tracks and the cells are absent. In diatinction to 'high-pressure chambers, this effect cannot b3a removed since the temperature distribution in the low- pressure chamber cannot be regulated. Acknowledgments are made to M.S. Kozodayev and V.I. Anisimova. There are 3 figures, and 3 Soviet references. ASSOCIATION: Moskovskly inzhenerno-fizicheskiy institut (Moscow Engineering-physIcal Institute) SUBMITTED: June 19, 1958 Card 2/2 21 (0), 24 (0) A7rMR, Tyarozow, C. A. 30T/89-7-2-t6/24 Tr?=. Saientifle Conference of the =M (Natchraja kotforent.1ya Klrl~p PIQXODICALI AtOo4sq- 0-91Y-, 1959, Vol 7, J1r 2, pp 176-ITT < A33-UCT. The ;.-iy scientific -tinc .- h.Ld rroz 17 Wil to 15 may 1919 in the Mo.kovskly IAtxh*n*r-fiztch*oklj InaLltut (KOSCOw rb.-i-I Fulgimearlng institute). Lorv th= 600 7~tjclpmt. frm 100 different institutes att-dd the 2 pl--7 -d 10 venti.."I I-V w"feromo.s. A total of 148 lectures war. hold. T~.. following 1.0turoa ar speoially mentionedz --. K. R=!~!IZrSW oq the na-~(_ on pbyst..l facmd.U." of -I.cul- C 5; 'Plif, t _hi~akiy onthIts conatrut,tion of . foot "Actor, - the ovf of the p*riph,ral collision or mesons and moLsomm, ja~ on amparriuldity dud moment= of i--rti. of the nuclei, A. tm 4=4 City sv.. Y. 1. Gorr, ca Is er. ...It.d -it ra g the -.1- hall and nethods of comprehan4inc thea. _L_L. .Lux:LL&Z.w&d L. j.. Prokb- wo tb .17 1. f -be p ... ibl. scsp.rixent. for the o; ~thm M-racenta of the Card 1/~ P.A.momm. m the spectrum of I lq.Ld =4 crystalline hydrogen ujor pr-:ur. an instrument for ... V--Jtr the b,or,-lon Mr`*c, T. 7% Q-7. Glmc~-dLm. on r-Ic.rfW__p-o..LbLlitio ..thdo for llzsa~ Jgctj~p moovlerat- with al atary wavon,.E. A. PZALIZ. - ~rl and A. !rZb new, -th. under betalrom CondIt MAs of the &cc*lvr&tLqm, I On OPtim=_ v-" 14-Cth f-r - S. r. and 0. A. Tyo~~. fo"e- --z- C 1,.A in. el.atr= accelerator, LjI Zorl th- 3 m- It- Of the ialpl, &w no acesninotio-'-', om ="easnt In the '.Y.t- or . ,:.r of t';& olutron with consideration, of the mc3-%:rLA,, fL.1d.-O, L. L-P-1-a mthol for -~Iuj t:~. he .. conduction iv...7-Of LiR-idc AM JtO tb---7 Of t-'4* =.thd, YA__!Z~_ XIAb - 't- - ~ - f=.:. A. Ct ~1-1' whl~ in . cir-Isr apoo.. y_j__ b0moctron~l-ion to circulatLmE zorcur7. v t- 59 LIS ~Qjs~ Card Z/3 sp::Ial aditIonap ban eorj~lC with a flat triode In the L-;,Ll-- technique. IeZ- F-C-OY-1 c- C-I..l.-Lon ..th.de d construction of an ln;uloe t-sFo'-r Zm icn-rAcento with .octi-conduator els~smta, on a p - ibilLt" L.a le~ent vyctw for a itii 0.1 mate;'-* ccmtrol OFthe r=aoet.rd or P. I. To Of .... ral system. i-.h hih Shymi Cy a; -t~ cam be autcmatically v m 3 =q. started, zga~ hol-?t- the quality of .rawtor contro!. rhea the reActivity chAneas wto"~ or ,inarL!7. 0. A. L...-17gT -4 A. r. 7r.,. In on examination of the Lod!ne nethod ef refining vtiobi= =4 -h--acteristice of the metal obtln.d, Z. L. Gruzlz -d C. G. ]~-.b- On examinatitux f th =icro-dlotribu-.Im of -=bon~,u-48ten- iron 0 and otb~ .1..-t: I= circonicom and its .11~. b;- ... of -t,- redioCraphy, P. P. Foderor ca datermlAmtion cf -he swbli..tj~o heat of xirvoctl~- I by u-inC rcdioact-'v* LmAL-t,ca and 0. D. Fad..--- and .4 d.tarnlooti- of the diffmaloco coefficient. Of chromium. nickel. lm. ond chrociun nickel ate.13. The literature for al! tbel- 10cturs- will be Card 3/3 published by the VIn in a s7.pmiun. S lo 3 C) /6 J./C -, C) 10 C, Ito 10 ;' C I C 50' POO 022" 113 Y/ /,S- -2 0) BOO C/"~n AUTHORS: Gusarov, 1. 1., Lyapidev~3kiy, V. K4 TITLE: Determination of Inhaled Doses of Radon Decay ProductG PERIODICAL., Atomnaya energiya, 1960, Vol. 10, No. 1, pp. 64-67 TEXT: A new method is suggested for detormining the inhalation of radon decay products. The method is based on the counting of alpha particles per liter of air, which are produced by a complete decay of radon daughter products. In view of its relative exiguity, beta activity is neglected. The amount of energy released by a complete decay of the a-a,7tive atoms contained in 1 liter of air is given as E 1 = a(ERaA + ERaCI),~(b+c)ERaCl. where a, b, and c are the numbers of RaA, RaB, and RaC atoms, respectively, per 1 1 of air; ER&A and ERaC are the energies released per decay of the respective element. Denoting their mean value by E a, one obtains: E 2 = Ea(2a+b+c) - E an, where n is the number of alphas produced per 1 of air. The error due to averaging is insignificant,. If it is further assumed Card 1/5 Determination of Inhaled Doses oil Radon S/OP'9 60101010-0-1/cO91020 Boo6 Bo63 Decay Products YB that the absorption coefficient ^9 is equal for all inhaled rador decay products, E = ~nE will hold. In addition to the commonly accepted filter method, there are some other methods available for the determination of the unknown n: Supposing that for a certain pumping rate v, the number np of alphas recorded per unit time remains constant within a long time interval, the number of radioactive atoms will remain constant within the time At of this interval, that is to say, the number of radioactive atoms retained by the filter during the time 6 t is equal to the number of atoms decaying in the same time. In the time 8t, exactly 1 1 of air is to be pumped through the filter. For RaA, RaB, and RaC, the number of atoms retained by the filter is yl(a+b+c), where 'y, is the known filtration efficiency. The total number of decay events is 91(2a+b+c) = y1n and, -thus, n is equal to np/vyly2' where T2 is the recording efficiency; the counting rate nP is expressed in pulses/mini v is given in 1/min, A device with continuous recording of the alphas emitted by the filter was developed by the authors jointly with A. M. Konstantinov for dose measurement by this Card 2/5 Determination of Inhaled Doses of Radon S108,016JI010100110091020 Decay Products BC06/BO63 method. This device was used for two series of experiments, the first of which corresponded to a short-period exposure of the organism to a contaminated atmosphere, whereas the second series corresponded to a longer exposure, in which radioactive substances are' concentrated in the organism. This concentration differs from the concentration of these substances in the atmos;here. On account of the fluctuations in time of the quantities of substanceu contained in the air, simultaneous measurements viere made with two devices of the same type. The number of a-particles recorded in a complete decay of the daughter products proved to be largely independent of the method-applied and of the concentration ratio of daughter products. The radon concentration may be determined from the number of recorded alphas. Fig. 2 shoas accumulation and decay curves of daughter products retained by filter 1 and filter 2 (for v = 151/min, A = 11). The authors thank A. V. Bykhovskiy, M. S. Kozodayev, and Ye. V. Shchepotlyeva for discussions, and A. A. Titov -for assistance in measure- ment3. There are 2 fiCures and .3 refezvcnees: 2 Soviet and I US. SUBMITTED: January 12, 1960 Card 3/5 310691601010100110V -9/020 B0061 '063 Legend to Fig. 1: 1), and 2) filters; 3), 4) scintillation counters; the arrows indicate the direction of air movement Legend to Fig. 2: np counting rate, t pumping time Card 4/5 2 A ), t 123 4 3 r r~- 4 np, Uj(17/J(Uti 201 S108916-blO10100110091020 B00613CO-3 np, uxnlxuAt (pLlso-s 2 Card 5/5 ~2/. 5~200 67826 SOV/47-60-1-20/46 AUTHOR: Lyapidevskiy, V.K. TITLE: A New Apparatus for Observing the Tracks of Charged Particles (Convection Chamber)j 2.Z) PERIODICAL: Fizika v shkole, 1960,ANr 1, PP 70-72 (USSR) ABSTRACT: This is a detailed description of the above-men- tioned apparatus (Figure 1), and of how experiments on.4, and A radiation should be conducted using it. A convection chamber can work under ionic loads ex- ceeding thousands of times the natural background. This permits alpha-sources of great activity (hun- dreds of particles per second) to be introduced into the chamber, which was impossible with a dif- fusion chamber. It is also more reliable., as the entrance of 8utside air into it does not affect its work. An 80 C difference in temperatures is main- tained at the bottom level, and the intensive move- ment of gas caused by this accomplishes the transfer Card 1/4 of steam from the source. It is situated near the I/ 67826 SOV/47-60-1-20/4165 A New Apparatus for Observing the Tracks of Charged Particles (Convection Chamber) central part of the bottom near which a sensitive layer, several mm high, is formed. The gas attains a speed of several cm per second. The bottom of the chamber consists of two parts. Its central part is of a good heat-conducting material which is cooled to a temperature of -40 to -60 C. The part of the bottom near the sides of the chamber is made of a poor heat conductor. The sides are at a temperature approaching room temperature. Alcohol serves as a source of steam. Convection transfers the steam from the periphery to the cen- ter of the chamber. The liquid which has condensed in the center part of the bottom, which is elevated, runs off to the sides where it is warmed and again evaporates. The apparatus, filled with air and ethyl alcohol vapour at 1 atm pressure, starts to work when the temperature of the central bottom Card 2/4 part is below -20 0. Theofj and /S particle tracks 6ye'216 SOV/47-60-1-20/46 A New Apparatus for Observing the Tracks of Charged Particles (Convection Chamber) are observed through the transparent cover and sides. The radioactive preparation is introduced into the sensitive layer in the chamber by means of a special holder through an aperture in the side of the appa- ratus. To increase the number of tracks ofcZ par- ticles in the sensitive layer, an electric field is created between the cover and the bottom. The sensitive layer is illuminated through the sides of the chamber, and it is best to use for this purpose a PR-115 projector. The tracks of the particles can be observed in an undarkened room. With the aid of this convection chamber it is possible to conduct all the main experiments with 0& and t3 ra- diation. to demonstrate the -tracks, measure the ac- tivity of preparations, obtain absorption curves and measure the length of the run ofU particles. Instructions how to conduct these experiments are Card 3/4 given. There are 2 diagrams, 1 chart, 1 photo- q1 6 7 82 6 SOV/47-60-1-20/46 A New Apparatus for Observing the Tracks of Charged Particles (Convection Chamber) graph and 1 Soviet reference. ASSOCIATION: Inzhenerno-fizicheskiy institu4TUA-Oscow Card 4/4 Engineering-Physics Institute) LYAPIDEVSKIX.,.V.K, godel for the study of color vision. Dokl-AU SSSR 134 no.2: 463-466 S 160. (MIRA 13:9) (GOLOR SENSE) (PHYSIOLOGICAL APPARATUS) LYAPIDEVSKIY, V.K.; PAVLOVAp T.G. Vlffual method for the determination of law activitie-3. Yled.rad* no.Ut66-171 961. (IMU 14 :11) 1. Iz dozimetricheskoy laboratoril Gosudarstvennogo nauchno--- issledovatel2skogo rt~-,zitgeno-radiologlcheskogo instituta Mini- sterstva. zdra,7ookhraneniya RSFSR. (RADIATIOli-ICASUREMENT) 2Pj3l5 s/cal BI 06~31 01 AUTHORS; Gusarov., I.. I, Lyapidevskiy, V.. K. TITLE; 1-Tew methods of determining atmosrheric pcllution by radon daughter products PERIODICAL; Referatiunyy zhurnal. Khimiya, no. 16, 1961, 32' '1, abstract 16 W 356 (Med. radiologiya, v. 6, no. 1 1~61 . ': ~)2-57) TEXT: A method of total counting and an equilibrium method are described which are suffioiently accurate and can be employed in practice. The principle of both methods consists in determining the total number of a decays from the Rd daughter products which were isolated from a certain volume of the air to be examined. The principle of the equilibrium method, consists in measuring the a activity of a filter under conditions at which the equilibrium was established between the number of the atoms in,3ident. and those decaying on the filter. EAtstracter!s note: Comolete transla- tion.] Card 1/1 I.YAPILEVSKIY, V.K.; OBODOVSKIY, M.M. Diffusion claud chamber controlled by a photoelectric multiplier. Prib. i tekh.eksp. 6 no.6:38-40 N-D 161. (MIRA 14:12) 1. 14ookovskiy inzhenerno-fizicheski institut. (Cloud chambeJ (Photoelectric multipliers) S/12o/62/000/001/007/o6i E032/E514 AUTHORS: and Obodovskiy, I.M. TITLE: A convection chamber with a honeycomb base PERIODICAL: Pribory i telchnika eksperimeAta, no.1, 1962, 41-42 TEXT: It is pointed out that the convection chamber described by the first ~f the present authors in Ref.1 (RTE, 1999, No.4, 119) has a relatively small base area (up to 100 cm ). In the present paper the authors describe a chamber whose.base area can be made as large as desired without affecting its performance. The base consists of isolated prisms 1 (Fig.1), each of which functions as an ordinary convection chamber. The top ends of the prisms lie in a single plane and the prisms themselves are cooled down to -40 to -600C by thermal contact with the plate. 2 xjhich in turn is cooled by solid CO.. The upper part of the chamber (walls and lid) is maintained at room temperature. The working vapour eiraporates from the surface of the source 3 and is brought up by the gas flow into the upper region of the chamber, .. a nd then' down towards the prisms 1. Near the surface of the prisms there is a sensitive layer with a super-saturation Card'1/3 A convection chamber with a 5/12o/62/000/001/007/061 E032/E514 greater than the super-saturation at which droplets begin to form on ions. The cooled gas-vapour mixture becomes heated on approaching the walls and moves in the upward direction, thereby producing a closed convective flow of the gas-vapour mixture. The chamber operates continuously so long as the temperature difference h-etween the bottom and the top parts is maintained at the necessary value. In the honeycomb chamber the gas motion can be made to proceed in a single direction so that the diameter of the chamber can be reduced to the diameter of its working region. In order to achieve this, the prisms were laid over the entire base area, while the upper part of the chamber carried peripheral windows which were cDvered with the Petryanov (~nn-ig (FPP-15) filter. Air at room temperature was drawn into the chamber through the filter by a backing pump and after reaching the prism surface was ejected back into the atmosphere through an aperture in the bottom plate. There are 2 figures. ASSOCIATION: Moskovskiy inzhenerno-fizicheskiy institut (Moscow Engineering Physics Institute) SUBMITTED: May 17, 1961 Card 2/3 A convection chamber with a ... S/120/62/000/001/007/o6i E032/F-514 I Fig.1 I II f 1 11 f I i f i ;.. Card 3/3 S/04 62/008/00-3/007/007 7 0 0 0 B108YB104 AUTHORS: Lyapidevskiy, V. X., Falomkin, i. r. TITLZ: Effect of ultrasound on the process of directed arystdllizaticn PERIODICAL: Akusticheskiy zhurnal, v. 8, no. 3, 1962, 369 - 370 TLXT: The effect of ultrasound on the redistribution of impurities between the liquid and solid phases during directed crystallization was examined in a glass tube closed below by a nitrogen-cooled steel plate. Ultra- sound cxerts its principal effect upon the region near the boundary to the solid phase. This region is enriched in impurities; ultrasound' accelerates the transfer of substance. It probably a,1so accelerates the diffusion of dissolved substance into the liquid. The result of ultra- sonic treatment is an increase in the output rate of pure substance from the solution. There is 1 figure. ASSOCIATICV: Ob"yedinennyy institut yadernykh issledovaniy g. Dubna (Joint Inititute of Nuclear Research, Dubna) SUBLITTZ-0: January 15, 1962 Card 1/1 will 'LYAPIDEVSM. V. 'K. 019/02 8/089/62/013/006/ 7 B102/BW AUTHORS# 0. T. and M. R. TITLEs Nauchnaya konforentsiya Mookovskogo inshenernovfixioheekogo, Institute (Scientific Oonferenoe of the Moscow Engineering ,no Physics titilts) 1962 PERIODICALi Atomnaya energiya, Y. 13j nce 69 1962, 603 - 6o6 TEXT j' The annual oonfarence took place In May 1962 with more than 400 delegates participating. A review Is given of these lectures that are assumed to be of Interest for the readers of Atomnaya energlya. They are follovingo A.-I. Loypunskiy, future of fast reactoral A. A. Vasillyevp design of accelerators for superhigh energies*1 1. Y&. Poseranahuk, -.analyti6ityt unitarity, and asymptotic behavior of strong Interactions at high onergioal A. B. Migdals.phonomenological theory for the many-body prcbleml Yu.'D. Fiveyekiy, deceleration of m*dium-energy antiprotons in matterl Yu. . ogan, Ya. A. losilevskiyp theory of the Rdsobauer effeatj M. L4 Ryasanovp theory of ionization,lossee in nonhomogenoous; mediual Yu. B. Ivanovq A..A. Rukhadse, h-f conductivity of-suboritical plasma; S/089/62/03/006/09/027 Nauchnaya konferentritya... B1021BIS6 To. To. Loystakiy, A. A. Rukh4dze, electromagnetic waves in nonhomogeneous 1. L. Rozentalf, the origin of fast cosmic muons; plasmal Yu. D. Kotov Yu. M. Ivanov, muon depolarization in solids; V 0. Varlemov, Yu. M. Grashin,, B. A. Dolgoshein, V. 0. Kirillov-UMumov, V. 5, Roganov, k. V. Samoylov, p- capture by various nuclail V. S. Domidov, V. G. Kirillov-tjgryumov, A. K. Ponosov, V. P. Protanov, F. M. Sargeyov, soittaring of 9- me 5 , 15 Rev in a propane bubble chacberl S. Ya. Nikitin, M. S. Aynu d Ya. 14. Selektor, S. M. Zombkovskiy, A. F. Grashin, muon production in X'p interactional B. A. Dolgothein, spark chamberal N. 0. Volkov, I. M.* Obodovskiy, study of operation of a convection ohamber-FT-. G. Finogenov, production of square voltage_pulaa"f-high amplitudeal G. M. Alekeekov, problems of color via ion j'-V--Xc_Ly&pidevsk _j-,-/ 13 ant 0 oral relation between number of receivers and number of Indepand To. M. Xudryavtoov, N. N. Sobolov, X. I. TIzongauzen, L. N. Tunitskiy, Y. S. Paysulov, determination of the moment of electron transition of os- oillator forces and the widths of the Schuhsan-Rungs bands of molecular oxygen; B. Y*. Gavrilov, A. V. Zharikov, V. 1. Riyko; decomposition of the volume charge of intense ion beamal Ye. A. Kramer-Agoyvv~j V. S. Troshin, moasurenent of neutron spectral 0. 0. Doroshonko$ now methods of fast - noutroq recardin8o V. 1. Ivancy, doolnetry torninclog7j. R. X. Voicnkvt 0 ar4L.2/4... 1-YAPIDEVSKIY, V.K.; FALOWIN, I.V. -------- ~ I Effect of ultrasound on oriented crystallization. Akust-zhur. 8 no.3:369-370 162. CIP.A 15;11) 1. Ob"yedinennyy institut, yadernykh issledovaniyf g. Dubna. (Ultrasonic waves-Industrial applications) (Cryotallization) LYAPjDaVS-KIY,__Viktor Konstantinovich, kand. fiz.-mat. nauk; LYUSTIBERG, V.F.9 inzh., ved. red.; LEVIN, G.E., kand. tekhn. nauk, red.; SHVETSOV,, G.V., tekhn. red. [=X".ion chamber for determining slight o-(.- and (3-activities) Diffuzionnaia kamera dlia opredeleniia malykh O