Chronique bibliographique

208

Annales de l'Association internationale pour le Calcul analogique

N ° 4 - - Octobre 1962

CHRONIQUE BIBLIOGRAPHIQUE N O T E DE L'EDITEUR Pour faciliter la consultation de la bibliographie, nous avons adopt~ un double classement ; d'abord un classement chronologique et ensuite, clans chacHne des ann3es, nn classement alphab3tique. Chaque lois que la source de la bibliographie a ~td indexde, l'index num&ique se trouve en tgte de la r3fdrence. Les r3f&ences anonymes, telles que <> sont classdes en t~te de l'ann3e. II n'a pus dt3 tenu compte de particules clans les noms propres, ainsi d ' A T R I est class3 sous A T R I , yon H O E R N E R est class3 sorts HOERNER. Quand la rdf&ence comporte plusieurs noms d'auteurs, elle est classde sous le nora du premier auteur. Le Comit3 de Rddaction a estimd devoir comment er certaines rdf&ences. Elles sont class6es 3galement suirant les indications qui prdc~dent. Certaines rdf&ences parues sans commentaire dans le prdsent fascicule seront commentdes clans les prochaine numdros de la revue. Tirds-Q-part : Ceux de nos lecteurs qui seraient int6ress6s 71 recevoir des tir6s-k-part des pages bibliographiques de notre revue peuvent obtenir ceux-ci en en faisant la demande, k l'avance, adress6e k l'6diteur : Les Presses acad~miques europ&nnes, 98, chauss& de Charleroi, Bruxelles 6 ~ Belgique.

1959 CHAUDHURI A.K. : Solution of boundary value problems using electronic differential analyser, Proc. Sympos. Mech. Real Fluid, Kharagpur 1958, Jonrn. Sci. Engrg. Res,, Vol. 3, 1959, pp. 393-408. 4699 621-52 : 681.142 DANYLCHUK I. & KATZ D. : Magnetic amplifier binary-toanalog conversion, Non-linear magnetics and magnetic amplifiers Conference, Washington 1959, pp. 306-312. 4700 681.142 STEMPIEN A, & SZOPLINSKI Z. : A non-linear converter

for simulating relay characteristics having a dead-zone and a hysteresis loop, Arch. Autamat. Telemech. (Poland), Vol. 4, 1959, n ° 4, pp. 441-447. 4701

1960 ARMSTRONG H,R, & SIMKIN L.J. : Grounding electrode

potential gradients from model tests, Trans. Amer. Inst. Elertr. Engrs., Vol. 79, 1960, Part III. Power Apparatus and Systems, October 1960, pp. 618-623. (Annales, Vol. 3, 1961, n o 3, juillet, p. 139). 3709 <~This paper presents surface gradient data obtained from tests on model electrodes in a large electrolytic trough. The principal objective of the study was to explore means for reducing earth-surface potential gradients in the vicissity of steel columns or equipment in an outdoor station. ~> BALDWIN C.aT., De SALVO C.A., HOFFMAN C.H. & PLANT E.C. : Load and capacity models for generation planning by simulation, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part III. Power Apparatus and Systems, August 1960, pp. 359-365. (Annales, Vol. 3, 1961, n° 1, jaovier, p. 34). 3062 <~Detailed simulation of power system loads, forced outages, scheduled outages, and periodic overhouls has been accomplished for the public service system. Comparable quantities have been simulated for the Pennsylvania. New

Jersey - Maryland Interconnection. Together they permit daily simulation of load, available capacity, and spinning capacity on the respective power systems. Comparison of these quantities gives daily margins which may be used to evaluate reserve adequacy. ~> 621.389 : 681.142 CLYNES ~v[. : Computer dynamic analysis of the pupil light reflex. A unidirectional rate-sensitive sensor, Medical Electronics Conference, London, 1960, pp. 356-358. 4702 621.389 : 681.142 GUELKE R.W. & GUELKE C.B. : An electrical model of the cochlea, Medical Electronics Conference, London, 1960, pp, 368-369. 4703 681.142 GREENSTEIN aT. : A two-channel data link for combined analog-digital simulation, Trans. Americ. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, March 1960, pp. 40-44. (Annales, Vol. 3, 1961, n ° 2, avril, p. 85). 3479 Selon le syst~me physique ~. simuler, il peut &re plus avantageux de faire appel soit ~ un calculateur analogique, soit / t u n calculateur num6rique. Chacun des syst~mes pr& sente ses avantages et ses inconv~nieots. L'article a pour objet de discuter les caract6ristiques des calculateurs analogiques et num&iques qu'il est avantageux de combiner. I1 d6crit une liaison Ii deux voles construite par Convair duns le but d'interconnecter un calculateur analogique et un calculateur num6rique, en illustrant cette technique duns une simulation en temps r&l. 681.142 HAUG A.: Generators and storage devices for functions of the forms y ~ )¢ (x) and z ~ f (x, y), Nachrichtentech. Fachbet., Vol. 17, 1960, pp. A1. A14 (in German). 4704 KLINGENBERGER aT.L. & BRIGGS R.W. : Analog computing representation of an aircraft electric power generating system, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part II. Application and Industry, November 1960, pp. 402-406. (Annales, Vol. 3, 1961, n° 2, avril, p. 86). 3~12

Chronique bibliographique <¢The analysis of an aircraft a-c electric power system presented in this paper illustrates how time, effort, and costs required to complete the development can be substantially reduced if proper system dynamic performance can be assured prior to the construction of the actual hardware.>> 621.3.012.8 KOENIG Eldo C. : The existence of an electric analog of a magnetic circuit established by the basic laws defining magnetostatics, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, September 1960, pp. 400-403. (Anna&s, Vol. 3, 1961, n ° 2, avril, p. 86). 3513 <~This paper is concerned with the special case of the equivalent circuit of magnetic fields of static current circuits where flux is represented by current, and magnetomotive force by electromotive force. The equivalent has been applied in analyzing magnetic circuits containing saturable material. The analog computer used has previously been described; it contained nonlinear resistance elements whose nonlinearity gave an ampere-versus-voltage curve of the same shape as the saturation curve of steel. ~> MOORE A . D . : The magnetic analog with spiral search coils, Trans. Americ. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, July 1960, pp. 256-264. (Annaler, Vol. 3, 1961, n ° 1, janvier, p. 39). 3169 Dans une analogie magn&ique d'un ~coulement de chaleur pris comme exemple, le milieu conducteur uniforme est remplac6 par un conducteur 61ectrique portent un courant uniform~ment distribu6, baignant dans un milieu de perm~abilit4 unitaire. Les lignes de force du champ repr~sentent les isothermes et les lignes 6quipotentielles les filets d'~coulement de chaleur. L'analyse du champ magn6tique se fait ~t l'aide d'une bobine spirale de construction particuli6re. 681.142 NECFIAY A. & STEMPIEN A. : Nonlinear function-generator for two variables, Arch. Automat. Telemech., (Poland), Vol. 5, 1960, n ° 3, pp. 355-379 (in Polish). -'1705 OKADA Robert H. : Stable transistor wide-band D.C. amplifiers, Trans. Americ. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and. Electronics, March, pp. 26-33. 4706 Amplificateurs op6rationnels ~. transistrons, comparaison entre dlff&entes m&hodes de stabilisation du z&o, par intervention d'un vibreur, amplificateur diff&entiel; analyse de la d6rive des amplificateurs diff&entiels. 621.313.2 : 681.142 OTOTAKE K. & GENCHI H. : Analysis of the commutation equation with the aid of electronic analog computer, E.T.]. Japan, Vol. 6, 1960, n ° 1, pp. 7-11. 4707

209

SCHWARTZENBERG J.W., FINAN J.M., UNDERKOFFLER V.S. & BREY R.N. Jr. : A multidecade linear simulator, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, September 1960, pp. 353-358. (Annales, Vol. 3, 1961, n ° 2, avril, p. 89). 3582 <~The United States Government exhibit for the 1958 Geneva Conference included a simulation of the main portion of the entire Experimental Boiling Water Reactor (EBWR) plant. The total simulation consisted of two operating panels similar to the EBWR control panels and an animated model of the plant. The discussion is limited to the computer technique utilized to accomplish a linear simulation of the neutron kinetics of the reactor over a full operating range of 8 decades. ~ SHEPHEARD V.G. : The prediction of ship performance from model tests: the nature of the problem, North East Coast Institution of Engineers and Shipbuilders Symposium, 11-13 April 1960, Newcastle Upon Tyne, 1960, pp. 1-10. 4710 681.142 : 621.311.21 SIN'KOV V.M., ZASENKO V.L., KOVALENKO V.P. & FOL'KMAN K. Yu: A computing device for distributi0g the active load at a pre-assigned consumption of fuel, Elektrichestvo, 1960, n" 8, August, pp. 9-15 (in Russian). 4711 681.142 STEMPIEN A. & SZOPLINSKI Z. : Analogue-digital converter for analogue machines, Arch. Automat. Telemech. (Poland), Vol. 5, 1960, n o 2, pp. 217-222 (in Polish). 4712 WILLIAMS Theodore J. & OTTO Robert E. : A generalized chemical processing model for the investigation of computer control, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, November 1960, pp. 458-473. (Annales, Vol. 3, 1961, n ° 4, octobre, p. 195). 4060 <~The Monsanto Chemical Company has proposed the use of the chemical processing model described herein to those interested in computer control with the hope that it may serve as a basis for a direct comparison of the availabie computers and of their relative capabilities. ~>Every effort has been made to have this model include as many as possible of the effects present in typical chemical manufacturing plants. Reaction, heat exchange, multiple separation steps, and recycle streams have, therefore, been included, since they will usually be part of a typical process. 621.389 : 681.142 WYNDHAM C.H. & ATKINS A.R. : An approach to the solution of the human biothermal problem with the aid of an analogue computer, Medical Electronics Conference, London, 1960, pp. 32-38. 4713

621.313.2 OTOTAKE K. & GENCHI H. : Analysis of the commutation equation with the aid of electronic analog computer (consideratlon of coil resistance effects), E.T.]. Japan, Vol. 6, 1960, n ° 1, pp. 12-16. 4708

***: M6moire digitale pour calculateurs analogiques. Rat,. G~n&ale Electron. (France), tome 15, 1961, n o 179, octobre, pp. 49-50. 4714

681.142 RITTER W . & KRAUSHAAR E. : Analogue and digital data processing in switching stations, Siemens-Zeitsehrifl, Vol. 34, 1960, n ° 10, October, pp. 679-684 (in German). 4709

ARMSTRONG H.R. & MILLER B.D. : A surge-impedance analog of a large generating plant switchyard, Trans. Amer. Inst, Electr. Engrs., Vol. 79, 1960, Part. III. Power Apparatus and Systems, February 1961, pp. 1050-1054. 4715

1961

210

Annales de l'Association internationale pour le Calcul analogique

<~Surge-impedance analog ~tudies of lines and stations as illustrated in this paper are applicable to a wide range of power-system surge performance problems. It is conceivable that a building-block type of analog could be constructed with plug-in units designed to represent circuit elements such as a single station bay, a line entrance, or an entire bus section. Regardless of how the analog may be constructed, the method offers a low-coast reasonably simple method to obtain surge performance data on complex circuits that otherwise could be approximated. As these approximations have, in many past cases, contained what might be termed ignorance factors, the result has been extreme conservation in the application of overvoltage protective devices. This is evident in the widespread use of a large margin between the protective level and the strength of the equipment insulation. With more precise circuit surge performance data, as can be obtained from a miniature system analog, protective devices can be applied in a more exact manner to achieve more economical installations. ~) BEREZOVETS G.T., DlvIITRIEV V.N. & TAL A.A. : A new type of pneumatic computers. I, Automation and Remote Collt,'olj Vol. 22, 1961, n ° 1, January, pp. 93-100. (Annales, Vol. 4, 1961, n o 2, avril, p. 114). 4400 <(This article is concerned with methods for the design of pneumatic analog computers that are based on pneumatic decision amplifiers operating at low pressures (0-100 mm of water). The first part of this article describes methods for performing linear algebraic operations. )) BIRKEL George Jr. : Hybrid computers for process control, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, January 1961, pp. 726-734. (Annales, Vol. 3, 1961, n° 3, juillet, p. 145). 3882 ~ Quite economical process control and processing of instrumentation data may be accomplished by hybrid computer. This tool combines the best features of analog and digital systems with a simplicity and economy unavailable in either, to produce a unique combination which is capable of operating at extremely high speed and accuracies, over large numerical ranges. ~ The Radiation Incorporated hybrid analog-digital computing technique is based upon analog-digital conversion devices used as ratiometers and dlgital-to-analog conversion devices used as multipliers. Addition and subtraction are accomplished by digital logic and summation. Exponent book-keeping retains the full accuracy of the data, with automatic adjustment of scale factors. Round-off of data is accomplished in the sense nf "best-fit". ~) 681.142 : 621.317.39 McCALL R.C. & LARSSON E,I. : A low priced automatic print-out system for the Hutchinson-Scarrott analyser, Nuclear lnstrum, and Methods (Netherlands), Vol. 13, 1961, n o 1, August, pp. 92-94. 4716 CHAKRAVARTI P.C. : Truncation error in interpolation and numerical differentiation, Numer. Math., Vol. 3, 1961, pp. 279-284. 4717 CHAUDHURI A . K . : Solution of nonlinear differential equation with the help of electronic differential analyser, ]. Sci. Engrg. Res., Vol. 5, 1961, pp. 141-144. 4718 CHERRY C., VASWANY P.K.T. : A new type of computer for problems in prnportional logic, with greatly reduced

N" 4 --

Octobre 1962

scanning procedures, Inform. and Control (U.S.A.), Vol. 4, 1961, n ° 2-3, September, pp. 155-168. 4719 CHI J.N.C. : Determination of intermittent duty rating of an aircraft motor by equivalent thermal circuit and a direct analog computer, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part II. Applications and Industry, January 1961, pp. 451-460. (Annales~ Vol. 3, 1961, n ° 3, juiilet, p. 145). 3890 < CHIN LAN: Non-linear computing blocks made from nonlinear semiconductor resistors, Automatic Remote Control Proceedings, 1st Intern. Congress I.F.A.C.. Moscow 1960, III, London 1961, pp. 109-120. 4720 COKER C.H. : Applications of feedback controlled core computing circuits to analog-to-digital conversion, Dissert. Abstract (U.S.A.), Vol. 21, 1961, n o 11, p. 3396. 4721 681.142 : 621.385.833 COLEMAN C.F. : A network analogue for a quadripole lens system, Nuclear Instrum. and Methods (Netherlands), Vol. 14, 1961, n ° 1, November, pp. 53-62. 4722 621.389 : 681.142 COTE A.J., Jr. : Simulating nerve networks, Vol. 34, 1961, n ° 41, October 31, pp. 51-53.

Electronics, 4723

CRIPPS L.G., SLATTER ].A.G. : Amplifier gain and stability, Journal of the Brit. Inst. of Radio Engin., Vol. 22, 1961, n ° 5, November, p. 417. 4724 CSORDAS Z. : On application possibilities of pneumatic analogies, Automatic Remote Control Proceedings, 1st Intern. Congress I.F.A.C.. Moscow 1960. lI[, London 1961, pp. 236-242. 4725 CUNDALL C.M. : Report on the third International Convention on Analogue Computation, Opatija, September 1961, Inslrum. Pratt. (G.B.), Vol. 15, 1961, n ° 11, p. 1403. 4726 DEJUSSIEU- PONTCARRAL : Calculateur <{Analac )) Traceur X-Y, Electron. Industrielle (France), 1961, n ° 48, novembre, p. 336. 4727 DICKINSON M.M. : A comparison of digital differential analyzer and general purpose equipment in guidance systems, 2~rans. Amer. Inst. Etectr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, January 1961, pp. 706-708. 4728 <
Chronique bibliographique made of the equipment programming difficulty and flexibility. For the problem considered the two equipments are seen to be competitive in most respects. )) 681.142 : 621.438 DILLARD J.K. & E V E R E T T J.L. : Simulation of the steam power plant, Westinghhouse Engrs., Vol. 21, 1961, n ° 6, November, pp. 174-179. 4729 MacDONALD N , : Survey of commercial analog computer, Computers and Automation, Vol. 10, 1961, n ° 6, June, p. 117. 4730 EGGERS C . W .

& SZE

J.W. : A

new function generator,

Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, January 1961, pp. 756-762. (Annales, Vol. 3, 1961, n o 3, juillet, p. 145). 3895 ~ A new function generator has been developed, constructed, and tested successfully by the authors, and results are presented in this paper. This function generator employs the combined techniques of digital circuits and analog computing circuits. ~>

211

GRANDMONTAGNE R. : Valeurs initiales pour le calcul analogique des fonctions d'onde et calcul num&ique des polyn6mes de Laguerre g6n6ralis~s. Cab. Thys (France), tome 15, 1961, n" 133, septembre, pp. 385-388. 4737 GRAUPE K.K. : The analog solution of some functional analysis problems, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part I. Communication and Electronics, January 1961, pp. 793-799. (Annales, Vol. 3, 1961, n" 3, juiliet, p. 147). 3900 <) GONTSCH F.R. : Simulierung als Hilfsmittel in der Entwicklung und Anwendung informationsverarbeitender Geriite und Anlagen, Ann. Univ. sara1'. Sci.. Band 9. 1960-196l. Nr. 1-2, S. 93-120. 4738

681.142 FEIST W . : Rationalization with numerical control for machine tools, Siemens-Zeitschrifi, Vol. 35, 1961, n ° 8, August, pp. 567-574 (in German). 4731

HOVEY L.M. : The use of an electronic analog computer for determining optimum settings of speed governors for hydrogenerating units, Engineering ]ournal, Vol. 44, 1961, November, pp. 76-79. 4739

FRYGIN

HOWE R. : Analog techniques, Instruments and Cono'ol Systems, Vol. 34, 1961, I1° 8, August, pp. 1482-1484. 4740

V.M. :

On

designing functional potentiometers,

Automation and Remote Control~ Vol. 22, 1961, n ° 4, April, pp. 477-480. 4732 <~The paper describes methods for designing functional potentiometers using unprofiled cases. A graphical method for computing functional potentiometers is given. ~ GERMAN D . A , : Binary to decimal translator, Electron. Technol. (G.B.), Vol. 38, 1961, n ° 10, October, pp. 364-367. 4733 GESSMANN R. und PFLUGER A . : Die Anwendung elektronisch gesteuerter Rechenautomaten fiir die Erdmassenberechnung im Rohrleitungsbau, Das Gas- und Wasser[ach, Band 102, 1961, N;. 22, Juni. 4734 GINSBURG S . A . : Logical method of synthesizing function generators, Automatic Remote Control Proceedings, 1st Intern. Congress, I.F.A.C., Moscow, III, London, 1961, pp. 129-136. 4735 GOL'DENBERG L.M. & OKUNEV Yu. B. : On programming problems for digital differential analyzers, Automation and Remote Control, VoI. 22, 1961, n ° 11, November, pp. 1359-1364. (Annales, Vol. 4, 1962, n" 2, avril, p. 115). 4438 < in the M.A. Banch - Brnevich Leningrad Electrical Engineering Communications Institute. ~> GOODMAN P.T. : Theory and application of a tapered electronic delay-line synthetizer, Automatic Remote Control Proceedings, 1st Intern. Congress, I.F.A.C., Moscow 1960, III, London. 1961, pp. 102-108. 4736

KARPLUS W.J. : The discrete-space-discrete-time computer, a general purpose transient field simulator, Automatic Remote Control Proceedings, 1st Intern. Congress, I.F.A.C., Moscow 1960, III, London 1961, pp. 137-140. 4741 A . : Investigatlon.of a Ward-Leonard variable speed drive by means of an electronic analogue system, Wiss. Z. Hochsch. Elektrotech. Ilmenau, Vol. 7. 1961, n" 1, pp. 3540 (in German). 4742

KNAPKE

G R A N I N O A. : Exact design equations for operational amplifiers with four-terminal computing networks, IRE Trans. on Elect. Comp., Vol. EC-11, 1961, n ° 1, Correspondence, February, pp. 82-83. (Annales, Vol. 4, 1962, n ° 1, janvier, p. 50). 4289

KORN

681.142 : 621.313.32 KOVACS K.P. : The use of analogue computers for the solution of problems in control engineering employing asynchronous and synchronous electric motors, Regelungstechnik, Vol. 9, 1961, n ° 9, September, pp. 368-372 (in German), 4743 681.398 : 681.142 KUPERSHMIDT Y a . A. : Digital reproduction of signals from telemetering analogue computers, Avtomatika i Tdemekha. nika, Vol. 22, 1961, n ° 8, pp. 1080-1087. (In Russian), 4744 Y u . L. & K U R K I N A N . S . : Precision transistor integrator, Automation and Remote Control, Vol. 22, 1961, n ° 7, July, pp. 799-805. 4745 <
KURKIN

21_2 . . . . . . .

A_nna!es d e

l'Assodation i,,!er~a{io~a!e...l)=Ol!,'..leCalclfl analogique

~>A computation of the integrator's operation is given, an expression for the transfer function is derived, and limitations imposed by the finite time constant of the amplifier are pointed out. ~>Errors introduced by the diodes used for protection against circuit overloading are discussed. >> L A N I N N . D , : Pneumatic calculating machine as a means of ensuring the reliability of integrated automatic systems, Automatic Remote Control Proceedings, 1st Intern. Congress, I.F.A.C., Moscow 1960, III, London 1961, pp. 212-217. 4746 LIETHEN F.E., HOUPIS C.H. & D ' A Z Z O J.J. : An automatic root locus plotter using an analog computer, Trans. Amer. Inst. Electr. Engrs., Vol. 79, 1960, Part 11. Applications and Industry, January 1961, pp. 523-527. (Annales, VoI. 3. 1961, n o 3, juillet, p. 148). 3915 <~The purpose of this paper is to present a method for plotting the root locus automatically by means of an analog computer. This method is based on using an analog computer with servo resolver. The computer arrangement satisfies the necessary angle relationship as the value of s is varied. The result is an accurate plot of each branch of the locus. The open-loop poles and zeros are set into the computer setup by means of individual potentiometers. This gives flexibility in changing the poles and zeros to represent any system. )~ LISINI G , G . : Ph~nom~nes non-lin~aires dans les amplificateurs pour tensions continues stabilis~es par un 6crSteur utilis6s comme <
M A T Y A S J. : Filtres de forme pour la g6n~ration d'un nombre arbitraire de processus al~atoire avec propri&fis statistiques impos~es, Apl. Mat. Ceskosl., VoI. 6, 1961, n o 4, pp. 274287 (en tch~que). 4752 681.142 MAYNARD

F.B. :

The

voltage pile

transistor

quantizer,

LR.E. Trans. Prod. Engng. Prodn., Vol. PEP-5, 1961, n o 4, pp. 11-21.

4753

681.142 MEZEI J.E. : Minimal characterizing experiments for finite memory automata, I.R.E. Trans. Electronic Comput., Vol. EC-10, 1961, n ° 2, June, p. 288. 4754 M O R G A N M.L. : A new computer for algebraic functions of a complex variable, Automatic Remote Control Proceedings,

................. . . .N. . .°. . .4. . . .... . . . . . .Octobre ....... 1962

1st intern. Congress I.F.A.C., Moscow 1960, III, London 1961, pp. 121-128. 4755 MURRAY Francis J. : Mathematical machines; Vol. I : Digital Computers; Vol. I I : Analog Devices, 2 Vols. Columbia University Press, New York, 1961; Vol. I : 300 pages, $ 12,50; Vol. II : 365 pages, $ 17,50. 4756 681.142 N A K A T S U K A S. & KURAHASHI K. : A new function generator using time division interpolation, Mitsubishi Denki Lab. Rep. (Japan), Vol. 1, 1961, n ° 2, April, pp. 15-27. 4757 N A T A N A . : Matrix analysis of networks having infinite gain operational amplifiers, Proc. I.R.E., (U.S.A.), Vol. 49, 1961, n" 10, October, pp. 1577-1578. 4758 OHTERU S. : G~n~rateur de fonction d'hyst6r~sis magn~tique, ]. Soc. Instrum. Technol., Jap., Vol. 11, 1961, n ° 8, pp. 474479 (en japonais). 4759 PEARCE R . M . : Method of studying xenon spatial instability with an analog computer, Nuclear Science and Engineering, Vol. 11, 1961, n ° 3, p. 328. 4760 PLATZEK R.C., LEWIS H.F. & MIELKE J.J. : H i g h speed A / D conversion with semi-conductors, Auto. Control, Vol. 15, 1961, August, pp. 37-41. 4761 621.165 : 681.142 RAAB A . : Speed characteristics of condensing turbines with reheating during sudden full load release, Brennsto[[ . Wiirme - Kra#, Vol. 13, 1961, n ° 9, September, pp. 404413 (in German). 4762 REDLICH R . W , : A simple passive-element electrical analog to a gyro, Proc. I.R.E., (U.S.A.), Vol. 49, 1961, n o 10, October, pp. 1580-1581. 4763 RICHSTONE M. : The applied mathematics laboratory of the David W. Taylor Model Basin, Commun. ACM, Vol. 4, 1961, September, pp. 372-375. 4764 RYBASHOV M , V , : Analog solution of algebraic and transcendental equations by the gradient method, Automation and Remote Control, Vol. 22, 1961, n ° 1, January, pp. 66-76 (Annales, Vol. 3, 196I, n ° 3, juillet, p. 149). 3925 < 621.317.616 SCHOSSLER W . : Messung des Frequenzverhaltens linearer Schaltungen am Analogrechner, Elektron. Rdsch., Bd. 15, 1961, Nr. 10, S. 471-477. 4765 SHILEIKO A.V. : A method for selecting the optimum structure of a digital analog computer, Automation and Remote Control, Vol. 22, 1961, n ° 1, January, pp. 76-81. (Annales, Vol. 3, 1961, n ° 3, juillet, p. 149). 3928 <~This article presents a method for choosing the optimum structure of digital analog computers on the basis of a special factor - - the figure of merit. Comparable structures are

Chronique bibliographique described by a series of numbers called the structure parameters. The problem is to find some group of parameters which give the extreme value of the figure of merit. A concrete example of a design of a digital analog computer is given. ~> SMOLOV V.B. : Electronic decoding and coding function generators, Automation and Remote Control, Vol. 22, 1961, n ° 2, February, pp, 180-185 (in Russian). 4766 ~ This article describes digltal-analog computers which can be used for the functional decoding of digital information and the functional coding of analog information. It also presents the calculations used in the design of these computers. ~> STANKE W.A, : The transponder. New link in data digitizing, I.S.A.]., U.S.A., Vol. 8, 1961, t-t° 11, pp. 43-45. 4767 T A T Z A. & MEHALL A.D. : Analysis of a VOR distance computer, U.S. Gov. Res. Repts., Vol. 36, 1961, July 5, p. S-34 (A). 4768 T R U X A L J.G. : Computers in automatic control systems, U.S. Go*,. Res. Repts., Vol. 36, 1961, July 5, p. 8-85 (A). 4769 621.313.322 : 681.142 W E E D Y B.M. : The determination of the transient temperature distribution in a turbo-alternator rotor by menas of an analogue, Proc. lnstn. Elect. Engrs., Monograph 4725, October 1961, Vol. 109 C, pp. 126-137. (Annales, Vol. 4, 1962, n ~ 1, janvier, p. 53). 4344 1962 ***:

Calculateurs

analogiques

213

reterence frame is described, together with the derivation of the necessary transformation between rotor reference axes. A four-machine system is used as an example of the method. )> APPLEYARD A.H. : Glass disk generates any low-frequency waveform, Electronics, Vol. 35, 1962, n o 23, June 3, p. 45. 4776 ARON N. & GRANGER C. : Analog-to-digital converter uses transfluxors, Electronics, Vol. 35, 1962, n ° 20, May 18, pp. 62-66. 4777 ~ BALCHEN Jens. G. : Electromechanical generator-multiplier simplifies response tests, Control Engineering, Vol. 9, 1962, n o 6, June, p. 151. 4779 BRENNAN P.J. & R O B E R T S A.P. : Use of an analogue computer in the application of Pontryagin's maximum principle to the design of control systems with optimum transient response, lore'hal of Electronics and Control, G.B., Vol. 12, 1962, n ° 4, April, pp. 345-352. 4780

dons l'industrie du papier,

Manutention, M&anique el Automation, tome 15, 1962, n ° 1, pp. 23-29.

4770

*** : Computer simulates pipeline behavior, International Electronics, 1962, May, p. 37. 4771 ***:

Drawing-board missiles fly in analog computer lab., 4772 <~Pre-patch panel is used for setting up programs, creating an electronic "model" of the system or device being evaluated. Individual potentometer settings determine specific parameters such as dimensions, tolerances, temperatures and other important factors. ~:,

International Electronics, 1962, April, pp. 29-30.

681.142 ADAMS K.M. & MORRIS R.A. : An analogue computer for the simulation of the behaviour of structures during earthquakes, sr, Electronics and Control, Vol. 12, 1962, n ° 2, February, pp. 143-176. 4773 ALAIS P. : Sur la description analogique d'une classe de syst~mes physiques et son application au calcul des ossatures hyperstatiques, C.R. Acad. Sci. (France), tome 254, 1962, n ° 3, pp. 409-411. 4774 621.311.161 ALDRED A.S. : Electronic analogue computer simulation of multi-machine pover-system networks, The Proc. of Instn. o~ Electr. Engrs., Part A, Vol. 109, 1962, n" 45, June, pp. 195-202. 4775 Summary: <
621.314.263 BR~DERLINK Marx : Essais sur modules r~duits de tripleurs de fr~quence statiques avec des noyaux magn~tiques de diff~rentes constructions, Elektrotechnische Zeitschri#, A, tome 83, 1962, I e~ janvier, pp. 12-15. 4781 CHASE R.L. : A servo-stabilized analogue-to-digital converter for high resolution pulse-height analysis, I.R.E. Transactions on Nuclear Science, Vol. NS-9, 1962, n o 1, January, p. 119. 4782 CHIRLIAN P.M. & MARSOCCI V.A. : Operational amplifiers using controlled superconductors, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, pp. 6-9. 4783 Summary: e The use of controlled superconductors in analog-computer circuitry is discussed. It is shown that the operations of summation, multiplication by a constant, differentiation, integration, and multiplication of two variables may be performed by these circuits. It is pointed out that the advantages of compactness, reliability, and light weight that are inherent to the use of controlled superconductors are now obtainable for analog as well as for digital equipment. )) CONNELLY Mark E. : Real-time analog-digital computation, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° I, February, pp. 31-41. 4784 Summary: <¢The relative advantages of analog and digital techniques in simulating complex, nonlinear systems in realtime are discussed. A hybrid configuration is suggested consisting of a basic digital computer and peripheral, hlgh-speed analog elements used on a time-shared basis under the con-

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Annales de l'Association internationale pour le Calcul analogique

trol of the digital program. Programs for function generation and for the solution of the aircraft ~oll equation are presented to illustrate the operation of the hybrid computer and the significant increase in the effective computing speed of the digital computer that results from the incorporation of peripheral analog elements. Further gains can be made by tailoring the order code and logic of the digital computer to the specific problem class of interest. )> The hypothesis is presented that a hybrid computer is technically feasible today that would be competitive with analog techniques on the basis of both cost and the ability to simulate natural aircraft frequencies in real-time. Moreover, such a computer would offer substantial advantages with respect to accuracy, dynamic range, flexibility, size, power consumption, and reliability. >> DAY Wilbur H. : Optics generates multidimensional.functions, Electronics, Vol. 35, 1962, n" 22, June I, pp. 60-64. 4785 DYER R.C. : Transient generator checks missile systems, Elec4786 tronics, Vol. 35, 1962, n ° 23, June 3, pp. 46-48. EARLS J,C. : Generation of low-frequency sinusoidal voltages of given phase, amplitude and frequency by means of a twointegrator loop, Journal of Scientific Instruments, Vol. 39, 1962, n o 2, p. 73. 4787 E A T O N J.R. & L O N G R.L. : A n electrical analogy of nuclear reactor neutron flux, Nuclear Science and Engineering, VoL 12, 1962, n ° 1, p. 82. 4788 FREDRIKSEN T . R . : A way to design low-loss nonlinear networks, Control Engineering, Vol. 9, 1962, n ° 6, June, pp. 117-119. 4789 FLUEGEL D.A. & FREEMAN L.K. : Simuling sampled data Control, Control Enginee~qng, Vol. 9, 1962, n o 6, June, pp. 123-125. 4790 <~ GAINES W.M. & PATTERSON W.N. : Accuracy in process computer instrumentation systems, Application and Industry, (U.S.A.), Vol. 59, 1962, March, pp. 5-10. 4791 GERECKE E. & B A D R H . : Asynchronmaschine mit prim~rseitig eingebauten steuerbare~ Ventilen, Neue Technik, 1962, Nr. 3, Marz, S. 125-134. 4792 GLINSKI G.S. : Magnetostrictive delay lines, LR.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, Correspondence, p. 86. 4793 GOLAY Marcel J.E. : The visualization of frequency-modulation transients by means of mechanical models, I.R.E. Transactions on circuit theory, Vol. CT-9, 1962, n o 1, March, pp. 78-82. 4794 GRATIAN J. W A R R E N : Time compression with a solidstate analog memory, Electronics, Vol. 35, 1962, n ° 19, May, pp. 88-92. 4795 >

N ° 4 - - Octobre 1962

GREENWOOD Donald T. : A comparison of higher-order difference methods in the solution of beam-vibration problems, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, pp. 9-17. 4796

Summary : <>The methods considered in most detail use the same basic central difference approximation, the variations occurring in the method of representing boundary conditions. Three higher-order approaches to the problem of boundary conditions are presented. They are 1) the use of one-sided differences of fourth order, 2) the use of symmetry assumptions, and 3) the passive-circult approach. Each method is shown to have its advantages, the final choice depending upon the particular requirements of the problem. >>Results are presented in the form of curves of percentage mode-frequency error vs number of cells for the various approximation methods. >> HALL H.P. & FULKS R.G. : The use of active devices in precision bridges, Electrical Engineering, Vol. 81, 1962, n ° 5, May, pp. 367-372. 4797 H A N N A K A M L. & CONCORDIA C. : Stability limits of synchronous motors during power system disturbances, Power Apparatus and Systems (U.S.A.), Vol. 58, 1962, February, pp. 1136-1141. 4798 HARCHENKO R.R., KONCHLOVSKI V.U. : Automatic meters with analogue and digital outputs, Elekt~qtchetvo (URSS), 1962, n o 4, pp. 36-40. 4799 HARTMANIS Juris : Maximal autonomous clocks of sequential machines, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, Correspondence, pp. 83-86. 4800 Summary: <> HAUSNER A r t h u r : Parametric techniques for eliminating division and treating singularities in computer solutions of ordinary differential equations, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° I, February, pp. 42-45. 4801

Summary: <~

Chronique bibliogralhique HASSALL W.H., FORBES J.A. : Electronic Simulator for processes, I.S.A. Journal (U.S.A.), Vol. 9, 1962, n ° 3, March, pp. 60.63. 4802 HENRY Eugene W. : Analog computer simulation of a frequency detector, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, Correspondence, p. 80. 4803 HERMANN P.J. : Simulation of steam generation in a heat exchanger, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, pp. 53-56. 4804 Summary : e An analog-computer flow chart is developed for use in setting up a simulation of the steam-generation process in a heat exchanger. It is assumed in the paper that the rate of heat flow from the primary side of the heat exchanger to the secondary side is already known. The technique described considers only the process in the secondary side of the heat exchanger. Factors suck as variations in pressure, boiling-point temperature, induction water heat rate, heat of vaporization, specific volume of steam, and rate of secondary steam extraction are considered. Some simplifications are made e.g., that the secondary steam is always at saturation conditions and that water level control in the boiler is good. Use is made of steam table data in function generators so that a fairly large range of operating conditions can be simulated. )> HOCKNEY R.W. & JEFFRIES T.O. : The use of analog computers in predicting the space-time behavlour of nuclear reactors, Proceed. of the I.E.E., Part A, Vol. 109, 1962, n o 44, April, pp. 131-138. 4805 JEFFRIES T.O. & al. : The Saturn analogue installation, Nuclear Power, Vol. 7, 1962, n ° 69, p. 69. 4806 JUNG H. & GIESSLER W. : Analogrechnerschaltung far Reaktorgleichungen, Die Atomwirtscha#, Band 7, 1962, Nr. 2, S. 74. 4807 KASISCHKE F.W. : Analog-computer techniques for simulation of dynamic pressure in re-entry studies, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, Correspondence, pp. 81-82. 4808 Summary: e The analog-computer simulation of dynamic pressure in re-entry studies is discussed, using additive sequential scaling techniques that have been utilized successfully on the System Dynamics Simulator of the Analog Computation Di¢ision (ASNCC), Wright-Patterson AFB, Ohio. ~> KATZ S. : Best endpoint control of noisy systems, Journal o] Electronics and Control, G.B., Vol. 12, 1962, n ° 4, April, pp. 323-343. 4809 KAUFMANN A. & al. : L'utilisation des calculateurs ~lectroniques en mati~re de simulation des ph6nom~nes 6conomlques et des probl~mes de gestion industrielle, Automaltsme, Vol. 7, 1962, n ° 3, p. 105. 4810 KELLY J.L. & SELFRIDGE O.G. : Sophistication in computers: A disagreement, Proceedings o] t]3e LR.E., Voi. 50, 1962, n ° 6, June, pp. 1459-1461. 4811 KORN Granino A. : The impact of hybrid analog-digital techniques on the analog-computer art, Proceedings o] the I.R.E., Vol. 50, 1962, n ° 5, May, pp. 1077-1086. 4812 Summary : e In a sense, many present-day analog computers exist in a gap left by the cast-speed characteristics

215

of available digital computers. But even as digital computers improve, the all.parallel "live mathematical model" afforded by analog-type simulation remains indispensable to the system designer. As a result, new hybrid computing elements and systems combine analog and digitaI features and analog computers are becoming faster. The techniques dlscussed include combination of conventional analog and digital computers, digital programming and check out of analog computers, operational digital computing elements, new high-speed analog computers with memory and digital switching, true hybrid computing elements, and some hybrid computer systems. ~> KORN Granino A. : Network approximations of variable time delays require caution, I.R.E. Transactions on Electronic Computers~ VoL EC-11, 1962, n ° 1, February, Correspondence, p. 82. 4813 KORN Granino A. : Exact design equations for operational amplifiers with four-terminal computing networks, LR.E. Transactions on Electronic Compulers~ Vol. EC-11, 1962, n ° 1, February, Correspondence, pp. 82-83. 4814 De LAND E.C, : Simulation of a biologlcal system on an analog computer, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, pp. 17-25. 4815 Summary : <(The purpose of this paper is to discuss a method for the construction of a mathematical model of a large biological system, This method, based on Gibb's free energy hypothesis, uses the format of mathematical programming, while the actual computation is accomplished by the method of steepest descent. The biological system chosen to exemplify the mathematical method was the respiratory funstion of the blood in hte human lung. This method is based on the postulate that chemical mixtures tend toward a reaction equilibrium which minimizes the potential, or free energy, of the system. We may thus write down the classical Gibbs free energy function for each chemical species, and require that total free energy relative to some standard state be minimized under the conditions of the experiment. The solution of the equilibrium problem consists of a set of mole numbers which minimizes the free energy function, subject to equations for conservation of mass and nonnegativity. )>The analog computer solution o f the respiration model was undertaken not oniy to give fast, sensitive tests of the mathematical model and its asssumptions, but also to obtain a simulation of the time dependent system. Examples of the mechanization of the equations are presented in this paper, and also results are computed for the static equilibrium of a canonical model. ~> LAWLER E . L . : Electrical assemblies with a minimum number of interconnections, I.R.E. Transactions on Electronic Com. puters, Vol. EC-11, 1962, n ° 1, February, Correspondence, pp. 86-88. 4816 McLEOD J o h n : Ten years of computer simulation, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n o 1, February, pp. 2-6. 4817 Summary : <>Deploring the analog vs digital concept fostered by some, the author stresses the complementary aspects of the two methods. Then, drawing heavily on the experience of

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Annales de l'Association internationale pour le Calcul analogique

others as well as his own, the more important improvements in simulation techniques and equipment of the past ten years are discussed. >>The two approaches to analog-digital simulation - - the hybrid-computer in which both techniques are combined in one machine, and the combined-simulation in which relatively pure analog and digital computers are connected to operate together - - are both viewed as attempts to capitalize on the unique advantages inherent in each method, and as presenting common problems. ~ The requirement for better education, not only of potential user - - the scientist, the engineer, and researcher in other fields such as biology and medicine but of the undergraduate and the public, is found to the greatest need.

the the -be

~>Improved equipment having greater reliability - - for somewhat less money - - is also needed. But it is predicted that that will come. It is the need for education which demands the attention of all who are interested in the future of computer simulation. ~> McLEOD J. (Ed.) :Simulation Council Newsletter, Instruments and Control Systems, Vol. 35, 1962, April. 4818 1. Western Simulation Council, November 9, 1961. a. Soviet development by L. NEUSTADT, pp. 159-161. b. Report on AICA Yugoslavia by G. KORN, p. 163. 2. Eastern Simulation Council, January 15, 1962. a. Analog simulation of a system: pulse timing in a PCM system by M.R. BRANOWER, p. 165. b. Analog computer technique that determines wide-band equivalent circuit of the 2105 transistor by J. CHERNAK, p. 165. c. Analog simulation on a circuit. A junction diode in a wave-guide by R.E. LA MARCHE, p. 165. d. Computer simulation for audio and visual communications. Research by H.S. McDONALD, pp. 166-167. e. Digital simulation of a TASI (time assignment speech interpolation) by C.L. SEMMELMAN, p. 167. 3. Analog techniques: Four quadrant division circuits by T.C. ANDERSON, p. 167. McLEOD J. (Ed.) : Simulation Council Newsletter - - Instruments and Control Systems, Vol. 35, 1962, May. 4819 I. Western Simulation Council Meeting of January 18, 1962, La Jolla. a. Work at General Atomic by VAN LINT, p. 151. b. Dynamic Model of the high temperature gas-cooled reactor by R.W. SCHLICHT, pp. 151-152. c. Analog simulation of a large steam generating unit by G. VAN WAGONER, pp. 153-154. d. Fourier Spectrum Analysis by analog Methods by G. COOPER and P. BROOM, pp. 154, 157-160. e. Basic Dystac theory by C.G. HARTFIELD, pp. 160161. LEONDES Cornelius T. Ed. : Computer control systems technology, McGraw-Hill Boote C°, Inc., New York, 636 pages, Price : $ 16.00. 4820

N ° 4 - - Octobre 1962

MANUKYAN R.S. & PAVERMAN S.V. : Using a computer for calculating optimum load distribution between different types of units at a steam power station, Elektritchestvo (URSS), 1962, n ° 4, pp. 33-35. 4821 MILLER H.S. & WINDER R.O. : A linear vector recognition function, I.R.E. Transactions On Electronic Computers, Vol. EC-11, 1962, n ° 1, February, Correspondence, pp. 88-90. 4822 621.313.332 MILES J.G. : Analysis of overall stability of multi-machine power systems, Proc. Instn. o/ Electr. Engrs., Part A, Vol. 109, 1962, n ° 45, June, pp. 203-217. 4824

Summary: ~ Conventional methods of assessing the stab/lity of multi-machine power systems neglect many factors, such as flux variation in the synchronous machines and the effects of regulators and governors. With the smaller stability margins characteristic of present-day system design, correct representation of these factors may be of considerable technical and economic importance. >>Accordingly, a general stability analysis for a multimachine system is developed and the solution of the resulting equations by both analogue and digital means is described. The results of a typical stability study on a representative system are presented and the relative effects of various assumptions evaluated. ~> MURPHY T.W. & CRANE R. : Analog computation of respiratory response curve, The Review of Sdentific Instruments, Vol. 33, 1962, n ° 5, May, pp. 533-536. 4825 < NEGNEVITSKII I.B. & NEGNEVITSKII S.B. : Increasing the accuracy and integration time of integrating amplifiers, Automation and Remote Control, vol. 22, 1962, n ° 10, October, pp. 1278-1281. 4826 PAREZANOVIC N. & DUJMOVIC M. : Accuracy improvements of the tapped-potentiometer function generators, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, pp. 63-66. 4827

Summary: <¢This paper describes a procedure for correct calculation of the resistance of the potentiometer function generator. The possibility of generating the function by taking inequidistant values of the independent variable is also described as is the possibility of generating some special functions. >> PELISSIER Ren6, CARTERON Jean & CARPENTIER Jacques: La simulation de lagestion d'un ensemble de centrales hydrauliques et thermiques, Revue G~n&ale d'Electricit6, 460 ann6e, tome 71, 1962, n ° 4, avril, pp. 215-224. 4828

Chronique bibliographique <~Les auteurs exposent les probl~mes z6solus lors de la r6alisation du module qui repr6sente l'ensemble des moyens de production d'6nergie d'Electricit~ de France et qui d6passe de beaucoup en complexit6 toutes les &udes analogues faites en diff6rents pays. Les deux &apes de construction du module ont permis d'aborder ces probl~mes dans leur ordre de difficult6 croissante, ce qui en facilite aussi l'expos6 >>. 681.142 REDSHAW

217

application of the described technique to the adjoint boun. dary value problem yields a means for continuous computation of G as a function of the second argument (t) for fixed values of the first argument (x). This is the required form for the analog evaluation of the integral formula. 7>The theoretical aspects of the method found are stated, after which an example of a simple non-self-adjoint problem from the study of structures is solved on an electronic analog computer.

RICHARDSON G.G. & W A N G T.C. : Use of the A-C network analyser and electronic differential analyser in the study of load frequency control, Power Apparatus and Systems (U.S.A.), Vol. 58, 1962, February, pp. 1143-1148. 4830

>>The amount of equipment needed to compute the Green's function is commensurate with the amount required to compute the solution to the differential equation of the problem. Moreover, once the Green's function is found and set on a function generator, the system can he studied thereafter by utilizing the simple integral formula; only two function generators, a multiplier, and an integrator are then required. >>

RODGERS George F. : Computer solutions to nuclear icebraker propulsion problems, A I E E Transactions, Applications and Industry, 1962, n o 59, March, pp. 33-40. 4831

TIEMANN J.J. : Raising input impedance of transistor amplifiers, Electronics (U.S.A.), Vol. 13, 1962, April, pp. 68-69. 4835

ROTH Harold H. : Analog computer systems in blending processes, 1.R.E, Transactions on Industrial Electronics, Vol. IE-9, 1962, n ° 1, May, pp. 42-47. 4832

TRUITT T.D. : An analog-digital real-time computer, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n° 1, February, pp. 46-52. 4836

Summary: <

Summary: <~A new kind of digital computer employing analog computing techniques is introduced. Planned as the central calculator in a "faster-than-real-time" computing system for a space range, the computer employs many, highspeed, digital circuits in parallel to calculate the solutions to sets of nonlinear differential equations. Parallel computing equipment employing simple numerical algorithms are shown to be superior in speed and accuracy of solution of sets of many equations than a hypothetical system of an unlimited number of conventional, stored program computers operating in unison. The operating and programming methods are described as an outgrowth of existing analog and digital computer techniques. The ;applications described indicate the effectiveness of the computer in the role of a prediction and control computer for a missile and pace range instrumentation system. )>

S.C. : Third international conference on analogue

computation, Opatija, September 1961, ]. Sci. Iustrum., Voi.39, 1962, r/° 3, March, pp. 101-102. 4829

SCHMIDT G.: Selbsteinstellender Regelkreis mit Bezugsmodell (Adaptive control systems using analog computers). Regelungstechnik (Deutschland), Bd. 10, 1962, Heft 4, S. 145151. 4833 TERASAKI Richard M. : Analog computation of GREEN's function for integrating two-point boundary value problems, I.R.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, pp. 57-63. 4834

Summary : <
y(x) - - I

G(x, t)/(t)dt, l)

where G(x, t) is the Green's function satisfying two-point boundary conditions while ] is a known integrable function. The paper describes a method for finding a specific set of initial value problems whose solutions, taken in linear combination, form the Green's function whose second argument (t) is fixed. This technique reduces the two-point boundary value problem to a set of initial value types and makes the continuous computation of the Green's function as a function of x for fixed t amenable to analog means. The

VAN DER WAAL B. : Calculatrice analogique simple pour d&erminer le point de couleur d'une source lumineuse, Revue Technique Philips, tome 23, 1962, n o 3, pp. 98-101. 4837 W A D H W A L.K. : Simulation of third-order systems with double-lead using one operational amplifier, Proceedings o[ the I.R.E., Vol. 50, 1962, n o 6, June, Correspondence, pp. 1538-1539. 4839 W A D H W A L.K. : Simulation of third-order systems with simple-lead using one operational ampllfier, Proc. LR,E., Vol. 50, 1962, April, p. 465. 4840 WEED H.R., WEIMER F.C. & LAHR R.J. : Analog simulation of a relay servomechanism with variable width transition, A I E E Paper n ° C P 62-92, 1962. 4841 WENDLAND P,H. & HANLET P.M. : An infinite-resolution function generator, 1.R.E. Transactions on £1ectronic Com. puters, Vol. EC-11, 1962, no 1, February, pp. 26-30. 4842 Summary : <
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Annates de l'Association internationale pour le Calcul analogique

provides a continuously-variable dc electrical signal in response to a shaft rotation. The elimination of a mechanical contact provides low torque, long life, and high-speed operation. Shaping of the thin film resistance track associated with this device produces art interesting function generator. Data is presented for successful operation of the laboratory model. An analysis is provided of the requisite track shaping to produce arbitrary functions. The electrical equivalent circuit of the device is analysed, and the conditions necessary for successful operation described.)> WHrTAKER L.W. & CHANDLER D.H. : Some factors influencing reliability in analogue circuits for precision radar applications, The Marconi Review, Vol. 25, 1962, n ° 144, First Quarter, pp. 65-71. 4843 a Following a brief enumeration of various standpoints from which the subject of reliability can be viewed this article concentrates on one, namely the influence of circuit

N ° 4 --

Octobre 2962

design on the maintenance of the required operating conditions over extended time periods. )) A description is given of some of the ways in which ~nalogue operational amplifiers may fail to retain their initial precision and how the requirement for high-order accuracy is inconsistent with the characteristics of transistors. A new circuit technique is then put forward which, while possessing many of the advantageous features of negative feedback, had certain special merits of its own. These will be discussed. )) WILLIAMS R.W. : Network approximations of variable time delays require caution, I.R.E. Trans. on Electron. Comp., Vol. EC-11, 1962, n ° 1, Correspondence, February, p. 82. 4844 WILLIAMS R.W. & PARKER G.M. : Synchro circuit with output proportional to input angle, LR.E. Transactions on Electronic Computers, Vol. EC-11, 1962, n ° 1, February, Correspondence, p. 82. 4845