The study investigated airborne visual reconnaissance from the nose versus side scanner stations of an aircraft. Six subjects performed the search task at the nose station of a B-50 aircraft and six different subjects performed the task at the two side scanner stations, located aft of the wings. During each pass one subject at the nose station and one at each of the scanner stations searched for tactical target sites located in rolling farm and woodland, and identified and counted the individual targets at the sites that they located. A mean of 65 percent of the target sites was detected by the subjects in the two scanner stations, whereas only 36 percent were detected by the subjects in the nose station. On the other hand, for the target sites that were detected, the scanner subjects identified only 37 percent of the individual targets while the subjects in the nose identified 60 percent. Wide differences between subjects were found in their search and identification performance. Author (GRA) N72-13096 National Lending Library for Science and Technology. Boston Spa (England). CHEMILUMINESCENT DETERMINATION OF COBALT IN ZINC OF HIGH PURITY A. K. Babko and N. M. Lukovskaya 1 Jun. 1971 6 p refs Transl. into ENGLISH from Anal. Khim. (USSR), v. 30, 1964 p 388-390 (NLL-NSTIC-Trans-2181-(6180-59)) Avail: Natl. Lending Library, Boston Spa, Engl.: 1 NLL photocopy coupon A technique has been developed for the determination of 0.000001 to 10 to the minus 7th power per cent bf cobalt in zinc of high purity. Analytical concentrates were obtained from 1 gr zinc thrbugh precipitation of the cobalt by alpha-nitroso-betanaphthol. After suitable treatment of the concentrates, the cobalt was determined by photographic chemiluminescent method. The determination of 3 x 0.0001 per cent or more of cobalt in zinc sulphate was carried out without separation of the zinc. Author N72-13097 National Lending Library for Science and Technology, Boston Spa (England). CURRENT CARRIER MOBILITY AND CONCENTRATION IN POLYMERS WITH CONJUGATED DOUBLE BONDS A. F. Lunin, V. G. Chernykh, S. S. Ogavesov, S. G. Moiseev, V. G. Kostrovskii, and Ya. M. Paushkin [1971] 10 p refs Transl. into ENGLISH from Dokl. Akad. Nauk SSSR (Moscow), v. 197. no. 6, 1971 p 1366-1368 (NLL-M-20943-(5828.4F); UDC-621.315.59) Avail: Natl. Lending Library, Boston Spa, Engl.: 1 NLL photocopy coupon Measurements of thermoelectric emf in polymers were made, and drift mobility and current carrier concentration were studied. Investigation showed that the thermoelectric emf of low ohmic specimens attains values of the order of 150 microvolts/deg C. That of high ohmic specimens may be as high as 600 microvolts/deg C. The thermoelectric emf was found to be slightly temperature dependent, giving grounds for assuming that the carrier concentration in the polymers studied is temperatureinvariant. It may also be assumed that the activation relationship between conductivity and temperature is determined by the mobility of the current carriers. K.P.D. N72-13098# Soviet Radio, Moscow (USSR). Avail: NTIS HC $6.00/MF $0.95 Conditions for realizing switching functions for a single threshold element are considered. Methods of synthesizing logic circuits and automata for threshold elements are investigated. A variety of threshold elements are described. A series of typical junctions and circuits for discrete action were studied. A table of threshold elements in six variables is presented. The synthesis methods lead to algorithms which can be conveniently applied to engineering practice. These are illustrated by example. N72-13099*# Chemistry. Transl. by K.P.D. Colorado State Univ., Fort Collins. Dept. of ELECTROCHEMICAL STUDIES IN ALUMINUM CHLORIDE MELTS Final Status Report, 15 Aug. 1969 - 14 Aug. 1971 R. A. Osteryoung Aug. 1971 101 p refs (Grant NGR-06-002-088) (NASA-CR-124723) Avail: NTIS CSCL 07D A melt purification system was developed which produces a final melt far superior electrochemically than those previously reported. A residual current of less than 2 microamps/sq mn at a sweep rate of 0.5 V/sec was used as the criteria for a pure melt. The use of a second purified bulk melt and a heated pipette permitted the rapid exchange of working electrode compartments while retaining the same reference electrode system. The major portion of the work was carried out in the 1:1 AICI3: NaCl melt at 175 and 200 C. Several measurements were made in the 2:1 melt and a few on the silver systems in intermediate compositions. Programs for PDP-81 and PDP-12 digital computers and the required electronic circuitry systems were developed to carry out various electrochemical measurements in the melt. A pair of 50 yard transmission lines were used to connect the computer to the experiment. Ensemble averaging and digital. least squares smoothing are used within the programs to improve the signal-to-noise ratio by at least an order of magnitude. Some of the computerized electrochemcial techniques used to examine the different systems were pulse polarography, double pulse polarography, staircase voltammetry, kinetic double potential step chronoamperometry and double potential step chronocoulometry. Author N72-13100# Connecticut Univ., Storrs. Dept. of Metallurgy. THE EFFECT OF SODIUM OXIDE ON THE THERMAL OXIDATION OF SILICON Owen F. Devereaux, Rong Yau Wang, and Kuang-Ho Chien Apr. 1971 28 p refs (Contract F44620-69-C-0011; AF Proj. 7921) 1 (AD-728713; UC-Met-2-71; AFOSR-71-1077TR) Avail: NTIS CSCL 07/4 Polycrystalline silicon wafers coated with Na2CO3 were oxidized in ambient air with P(H2O) = 24 mm in the temperature range 702 to 1052C. Initial oxidation followed cubic kinetics due to the linear change in composition of the oxide film with oxidation. At longer times the oxidation became parabolic as the concentration of and, therefore, diffusivity of hydroxyl in the oxide became nonlinear with the sodium concentration in the film. This occurs at lower concentration of sodium, where the presence of sodium is manifested in the formation of hydroxyl by an autocatalytic reaction. Untreated specimens oxidized as controls during these experiments showed similar behavior due to vapor phase transport of Na20. Author (GRA) A method and apparatus for the distillation of materials are described. The material, which may include liquid metals, is to be disposed in the base of a U-shaped tube. The upstream leg is surrounded with cooling coils for condensation and the downstream leg has heating coils along a portion of it for vaporization. The bottom reservoir portion of the U is heated. Between the reservoir portion and the upstream leg of the U. and within the device, is a capillary tube to carry the heated material from the reservoir to the heated region. A series of these tubes can be connected together in continuous fashion to produce fractional distillation. NASA N72-13103*# National Aeronautics and Space Administration. Betty S. Del Duca Washington Jan. 1972 17 prefs The electrochemical oxidation of p-type boron in 0.2 N NaNO3 solutions of pH 0.4 to 13.1 was studied by galvanostatic techniques. The capacitance of the electrode, Tafel slopes, and a limited analysis of reaction mechanisms are reported. The anodic dissolution in acid solution is a charge-transfer-limited one-electron reaction to form a monovalent species in the over-potential region of 0.25 to 0.70 V. The dissolution in basic solution is most probably a one-electron charge-transfer reaction from a monovalent to divalent species involving three hydroxyl ions. Open circuit potentials were mixed potentials, probably due to hydrogen formation at open circuit but not contributing to the electrochemical reaction at the applied overpotential. Exchange current, estimated by extrapolation of the Tafel line to the standard oxidation potential for the boron reaction, were of the order of 10 to the minus 6th power A/cm2 in acid solution and 10 to the minus 12th power A/cm2 in basic solution. The reaction order of the rate determining acidic and basic reactions was determined with regard to (H+) and (OH-). The level of illumination had no effect on the electrochemical behavior of the electrode. Author N72-13104# Bureau of Mines, Minneapolis, Minn. Metallurgy Research Center. IONIC CONSTITUENTS OF dc DISCHARGES IN A He-S02 MIXTURE David G. Kuehnm and L. M. Chanin 1971 20 prefs (BM-RI-7590; TN23.u7-no-7590; Dewey-7590; LC-622.06173) Avail: NTIS Positive ion sampling studies have been conducted on dc discharges containing 0.33 percent sulfur dioxide in helium. Measurements were made for normalized gas pressure from 0.45 to 6.8 torr and discharge currents from 5 to 40 ma. Ion species observed included SO(+), S(+), SO2(+), SO3(+), O(+), and 02(+). Studies were conducted on the functional dependence of the various ion species with respect to axial distance, pressure, current, and gas flow rate. Interpretation of these results is consistent with the assumption of SO2 dissociation. Deposition of sulfur compounds was observed in the plasma container during these studies. The present results are compared with previous studies which have been conducted in SO2. Author N72-13105*# Scientific Translation Service, Santa Barbara, R. Seidl Washington NASA Dec. 1971 16 p refs Transl. into ENGLISH from Czech. J. Phys. (Czechoslovakia), v. 20. 1970 p 73-83 (Contract NASW-2035) (NASA-TT-F-14088) Avail: NTIS CSCL 07D The activation energy of thermal destruction of F-centers in NaCl was measured by means of optical absorption. The resulting value of 2.1 eV is in good agreement with our results obtained by means of electron emission and luminescence. The different possibilities of interpreting the origin of this energy are discussed. It was pointed out that there are now more arguments for its interpretation as the thermal dissociation energy of F-centers than for any other interpretation. This interpretation leads to good agreement with the theoretical results of Pekar. The limited validity of the Rose relation is pointed out. Author N72-13106# Institut fuer Chemie der Treibstoffe, Berghausen (West Germany). PHASE STABILIZATION OF AMMONIUM NITRATES: INVESTIGATIONS OF COBALT AMMINE COMPOUNDS INFLUENCE ON STABILIZATION [DIE PHASENSTABILISIERUNG VON AMMONIMNITRAT UNTERSUCHUNGEN UEBER DIE BEEINFLUSSUNG DER STABILISIERUNG DURCH AMMINKOMPLEXE DES KOBALTS] W. Engel 20 Dec. 1970 42 p refs In GERMAN (ICT-13/70) Avail: NTIS The manufacture of ammide compounds by melting ammonium nitrates with various bonds was successful only with manganese and cobalt. Investigations, using differential thermal analysis, X-ray diffraction and diletometry, showed that the phase stability of ammonium nitrate was not noticeably influenced by the addition of ammide compounds with diatomic cobalt. The compounds provided a drying effect so that the samples behaved, at low humidity, like completely dry ammonium nitrates and were changed from modification 4 into modification 2. Melting with hexammine-cobalt (III) nitrate did not improve the properties of the nitrates. The results indicate a slight improvement in modification 3. ESRO COMPETITIVE REACTION KINETICS IN SEEDED FLAMES AND ROCKET EXHAUSTS D. E. Jensen Feb. 1971 18 p refs (RPE-TR-71/2) Avail: NTIS In such nonequilibrium combustion systems as rocket exhaust plumes, reactions of the type X + HY reversibly yields XY + H and X + Y + M reversibly yields XY+M, where X is a metal atom or free electron, Y is a free radical and M is a collision partner, compete to determine concentration ratios (XY)/(X). Competition criteria suggested by Sugden are modified, extended, and exemplified by reference to particular reactions of practical interest. The criteria help the chemist to select the minimum number of chemical reactions for computer calculations on the properties of combustion systems. Recommended rate coefficients and uncertainties are offered for several reactions of the above types. Author (ESRO) N72-13109# Aerospace Research Labs., Wright-Patterson AFB, Ohio. Chemistry Research Lab. THE SHOCK TUBE ISOMERIZATION OF CYCLOPROPANE WITH INFRARED ANALYSIS Interim Scientific Report Ernest A. Dorko, Ulrich Grimm, Gerhard Mueller, and Karl Scheller May 1971 35 p refs (AF Proj. 7023011) (AD-728638; ARL-71-0089) Avail: NTIS CSCL 07/4 In a continuing effort to develop kinetic analyses in shock tubes, the isomerization of cyclopropane to propylene was investigated. Three aspects of the problem were investigated: the theoretical analysis, the experimental infrared method of analysis, and the mathematical analysis. The test gas mixtures ranged from 0.1 to 5% cyclopropane in Argon. The temperature range was 1000 1350K. Kinetic measurements were made by means of infrared emission measurements at 4.79 microfs. This band corresponds to the V5+V10 combination band in the IR absorption spectrum of cyclopropane. A plot of the logarithm of the intensity of emission versus time was prepared. It was discovered that the rate constants determined show a dependence on the cyclopropane concentration although they are independent bf total or argon concentration. A discussion is given which indicates that the conventional steady-state assumption may not be valid for reactions in a shock tube. Author (GRA) N72-13110# Army Foreign Science and Technology Center, Charlottesville, Va. RADIATION OF OXIDIZABILITY OF OILS AND OILS WITH ADDITIVES BY A METHOD OF CHEMILUMINESCENCE A. M. Kuliev, G. G. Gurylev, V. B. Liksha, and L. G. Suleimanova 30 Jun. 1971 13 p ref Transl. into ENGLISH from Izluchenie Okislyaemosti Masel s Prisadkami Metodom Khemilyuminestsentsii, Academy of Sciences of the Azerbaidzhan SSR (AD-728151; FSTC-HT-23-985-71) Avail: NTIS CSCL 11/8 Research on the oxidizability of oils and oils with additives was studied by a method of chemiluminescence. The effectiveness of additives, the work capacity of oil with various additives, depending on time and temperature were tested. The chemiluminescent method is preferable to other methods because of: the speed of tests; the stable data obtained; and the small quantity of the product required for testing. Author (GRA) N72-13111# Army Foreign Science and Technology Center, Charlottesville, Va. ON THE CARBONIZATION OF PHENOL-FORMALDEHYDE RESINS IN THE PRESENCE OF POLYMERS WITH A LINKING SYSTEM R. M. Aseeva and A. A. Berlin 15 Jul. 1971 9 p refs Transl. into ENGLISH from Izv. Akad. Nauk SSSR, Ser. Khim. (USSR), no. 12, 1969 p 2835-2837 (AD-728147; FSTC-HT-23-718-71) Avail: NTIS CSCL 11/9 The influence of certain cross-linked polymers on carbonization of resins was studied at 200-1000C. The product of thermolysis of anthracene was found to improve the structure of the reaction product. Author (GRA) Arthur J. Socha, Eleanor M. Masumoto, and Robert K. Willardson refs Wright-Patterson AFB, Ohio ARL Sep. 1970 96 p (Contract F33615-68-C-1635; AF Proj. 7885) Analyses of II-VI compounds were performed using spark source mass spectrometer techniques. Of a total of 193 samples, 153 were analyzed using photographic techniques and 40 using electronic methods. The compounds of primary interest were CdS, CdSe, ZnS, and ZnSe. Detection limits were on the order of 1 to 10 parts per million. A technique was developed for determining oxygen in cadmium sulfide. Oxygen was found in concentrations of a few parts per million. Studies were made involving platinum as a probe material. The effects of using 24 kV accelerating voltage as compared with 16 kV were also investigated. A new technique was developed for the analysis of sulfur. Detection limits of +0.1 parts per million were obtained. A new type of mass spectrometer was used for the first time to investigate the distribution of impurities in cadmium sulfide. The instrument, called the lon Microanalyzer has the capability of analyzing surfaces by sputtering away successive monolayers of material with a beam of ionized gas. lon images, and mass spectra were obtained for samples of sodium- and copper-doped cadmium sulfide. Author (GRA) N72-13113# Naval Postgraduate School, Monterey, Calif. The investigation was concerned with the photochemical decomposition of nitramines, particularly N-nitropyrrolidine and N, N-dinitropiperazine. Photolyses were carried out in solution and in the solid state. Intermediates were identified by spectroscopic studies and by synthesis. On the basis of the intermediates, products, and spectroscopy of products, a mechanism for the photochemical decomposition of Nnitropyrrolidine was postulated. Author (GRA) N72-13114# Picatinny Arsenal, Dover, N.J. ELECTRIFICATION IN FLOW OF ALCOHOL-FREON MIXTURES THROUGH SOLID FILTER BEDS Maurice S. Kirshenbaum and Richard R. Fyfe Jun. 1971 72 p refs (AD-728807; PA-TR-4193) Avail: NTIS CSCL 07/1 The report presents results of laboratory experiments simulating the washing and filtration operations in a typical metastable materials process line with regard to generation, transport, and relaxation of electrostatic charge. The metastable material filter bed was simulated by a precisely characterizable filter disk. Wash fluids used were Freon and its admixtures with methanol and ethanol. Streaming current, potential rise rate, and relaxation half-times were determined for each admixture system, varying the alcohol content in a given mixture from 0 to 100 volume percent. Results indicate that behavior with regard to electrostatic charge is a definite function of the volume percent alcohol in Freon-alcohol mixtures used as a wash fluid for the inert simulated filter beds studied. Also, the electrostatic charge behavior was significantly different in Freon-methanol-inert filter systems than in Freon-ethanol-inert ones. Based on the experimental results, a scheme is presented to the engineer for assessment of danger zones with respect to electrostatic hazards in a given process design. Author (GRA) N72-13115# Picatinny Arsenal, Dover, N.J. Propellants Lab. (AD-728806; PA-TM-2010) Avail: NTIS CSCL 07/2 While assessing nitryl chloride (NO2 CI) as a possible nitrating agent for borazine and its derivatives, an analysis of several infrared spectra indicated that samples of nitryl chloride were contaminated with nitrosyl chloride (NOCI). Considerable attention was focused on the source of nitrosyl chloride and on means for its removal. A purification procedure was ultimately developed consisting of the simultaneous precipitation of NOCI and dinitrogen tetroxide (N204) as the solid complexes of boron trifluoride (BF3). Nearly water-white nitryl chloride was obtained in this manner. A tinge of yellow was attributed to the presence of chlorine. The reaction of nitryl chloride with a model compound, lithium dimethylamide, was found to yield dimethylnitramine as one of the reaction products. This is in contrast to previous studies made on the gas phase reactions of nitryl chloride with ammonia and several amines. A discussion is presented in view of these contrasting results. Author (GRA) C. C. Addison 30 Jun. 1971 70 p refs (Contract F61052-70-C-0035; AF Proj. 3148) (AD-728731; AFRPL-TR-71-104; Rept-62302F) Avail: NTIS CSCL 07/2 The compound Fe(NO3)3.N204 (NO(+)Fe(NO3)4(-)) was previously identified as the principal constituent of deposits responsible for flow-decay of liquid propellant N204 in steel systems. In the light of this, an extensive investigation of N204 adducts of Fe(NO3)3 has been carried out including synthesis, analysis, vibrational spectroscopy and X-ray studies. The work indicates that the constituent species of the solid adducts Fe(NO3)3(x)N204 (where x is typically 1.0-1.5) are NO(+). NO(+) (solvated by NO2 or N204), Fe(NO3)4(-), and N204. The behaviour of these adducts has also been studied in HNO3 solution and in HNO3/N204 mixtures. The properties of the Fe(NO3)3(x)N204/HNO3/N204 system are interpreted in terms of a gross modification of the HNO3/N204 phase diagram by Fe(NO3)3(x)N204. A flow apparatus has been constructed so that flow-decay deposit may be collected and its chemical identity and physical form studied as a function of the water (HNO3) content of N204 (monitored by H n.m.r.). A number of projected investigations is also discussed. Author (GRA) N72-13117# Army Foreign Science and Technology Center, Charlottesville, Va. HIGHLY DISPERSED AEROSOLS N. A. Fuks and A. G. Sutugin 22 Jun. 1971 91 p refs Transl. into ENGLISH from the book "Fizicheskaya Khimiya" Moscow, 1969 p 5-83 (AD-728736; FSTC-HT-23-225-71; T702301-2301) Avail: NTIS CSCL 07/4 An examination is made of the processes of formation of highly dispersed aerosols with particle dimensions less than 0.1 micron, methods of generation and investigations of these aerosols and their physical properties, which differ radically from the properties of coarsely dispersed aerosols. Despite the tremendous importance of highly dispersed aerosols in meteorology and several other branches of science, despite the enormously important role that they play in the processes of formation of condensation aerosols in nature and in science, there is practically no review-monographic literature on this subject and the review is an attempt to bridge this gap. Author (GRA) N72-13118# Quantum Systems, Inc., Albuquerque, N. Mex. CALCULATIONS OF ELECTRON IMPACT CROSS SECTIONS Final Report, 1 Jun. 1970 - 31 May 1971 Stephan Ormonde and Barbara W. Torres May 1971 57 p refs (Contract F44620-70-C-0102; AF Proj. 9751-01) (AD-728684; AFOSR-71-2222TR; Rept-61102F; Rept-681302) Avail: NTIS CSCL 07/4 The report is concerned with calculations of atomic collision processes with the generalized multiconfiguration, multichannel electron-atom scattering code. Results are presented for the scattering of low energy electrons by nitrogen(+) and oxygen(++) and comparison made with the only other configuration interaction model developed to date. Collision of strengths for transitions out of the ground state configuration of ions of nitrogen and oxygen are given. Author (GRA) THE EFFECT OF EVAPORATED METALLIC ELECTRODES ON THE TRANSITION TEMPERATURE OF TRI-GLYCINE SULPHATE M.S. Thesis Richard Fairfax Pell Jun. 1971 46 prefs (AD-728572) Avail: NTIS CSCL 20/3 Measurements of the effect of electrode thickness on the transition temperature of tri-glycine sulphate (TGS) are reported. An increase in the transition temperature is predicted utilizing the elastic Gibb's free energy equation of state. The prediction is verified by capacitance versus temperature measurements for evaporated gold electrodes varying in thickness from 250A to 3000A. The predicted increase in transition temperature is 0.15C while the measured value is 0.07C. Author (GRA) N72-13120# Naval Postgraduate School, Monterey, Calif. ELECTRON PARAMAGNETIC RESONANCE INVESTIGATION OF IRRADIATED LITHIUM ACETATE DIHYDRATE AND MERCURIC ACETATE SINGLE CRYSTALS M.S. Thesis Clinton James Coneway Jun. 1971 94 p refs (AD-728570) Avail: NTIS CSCL 07/5 An electron paramagnetic resonance study of X-ray irradiated single crystals of lithium acetate dihydrate and mercuric acetate has been made. The CH2(.)CO2(-) radical has been identified in lithium acetate dihydrate irradiated at liquid nitrogen temperature. The HCH angle was found. The principle elements of the hyperfine tensor and the g tensor were calculated. Mercuric acetate irradiated at liquid nitrogen temperature showed the presence of two CO2(-) species. Spectra at -80C showed the presence of two CH2()CO2(-) radicals. The principal values of the hyperfine tensor for the two magnetically distinct sites were obtained. Author (GRA) N72-13121# Detroit Univ., Mich. Dept. of Chemistry. (Grants AF-AFOSR-0980-67; AF-AFOSR-0980-66; AF Proj. 9760) (AD-728218; AFOSR-71-2141TR) Avail: NTIS CSCL 07/5 The theta-pinch flash lamp has been investigated for applications to photochemical studies. Attempts to find evidence for two photon absorption processes in several systems, including solutions of perylene in ethanol, subjected to the intense light flux from the theta-pinch lamp were not successful. Similarly, a search for the absorption spectrum of the phenyl radical in the liquid phase transient photolysis products from the theta-pinch flash photolysis of mercury diphenyl failed. A study of the theta-pinch and conventional flash photolysis of biacetyl pointed up the need for control of the cooling of the theta-pinch lamp in photochemical investigations. The low intensity (2537A), flash intensity and theta-pinch intensity photolysis of silyl iodide has been carried out at room temperature in the presence of scavenger and/or moderating gases. Some evidence is available for the formation of 'hot' silyl radicals. This research represents the first comprehensive study of the photolysis of silyl iodide. Author (GRA) N72-13122# Fulmer Research Inst., Ltd., Stoke Poges (England). THE TRANSPORT OF BERYLLIUM IN BERYLLIUM DICHLORIDE VAPOUR P. Gross and R. H. Lewin 23 Jul. 1971 25 prefs (Contract F61052-70-C-0021; AF Proj. 9713-02) (AD-728679; R.163/SR.8; AFOSR-71-2239TR; Rept-61102F; Rept-681308) Avail: NTIS CSCL 07/4 Experiments on the transfer of beryllium in beryllium chloride at pressures of about 0.00014 atmospheres have been made in the temperature range between 1250 and 1500K. The transport can be well interpreted as resulting from the reaction Be(solid) + BeCl2(g). The interpretation, however, cannot be reconciled with the mass spectroscopic investigation by Hildenbrand and Theard on the enthalpy of formation of monomer beryllium monochloride gas. With a reasonably estimated value for the entropy of the molecule (BeCl)2 the transport can be interpreted as resulting from Be(s) + BeCl2(g) 13 p N72-13123# Fulmer Research Inst., Ltd., Stoke Poges (England). HEAT OF FORMATION OF ALUMINUM BROMIDE P. Gross, C. Hayman, and M. C. Stuart 23 Jul. 1971 refs (Contract F61052-70-C-0021; AF Proj. 9713) (AD-728716; R.163/SR.9; AFOSR-71-2241 TR; Rept-61102f; Rept-681307) Avail: NTIS CSCL 07/4 The standard heat of formation of crystalline aluminium tribromide at 25C has been measured calorimetrically by reacting aluminium with liquid bromine in a glass combustion vessel. Separate measurements were made of the heat of solution of aluminium tribromide in bromine. A small correction to the experimental heat was made to account for the evaporation of bromine into the originally evacuated part of the vessel using published data. It amounted to approximately 0.06 percent. The heat of solution of aluminium bromide in bromine was also found. Author (GRA) 12 p refs Peter J. Ortoleva and John Ross Aug. 1971 (AD-728756; SQUID-TR-MIT-60-PU) Avail: NTIS CSCL 07/4 For a system of coupled chemical reactions, with diffusion and in a homogeneous steady state near marginal stability, the response to a periodic external perturbation is derived in a linear analysis and shown to be a resonance phenomena. Responses to perturbations of external variables with small effects on the rate coefficients are amplified at resonance. Suggested applications of the theory are: Study of kinetic parameters and their dependence on external variables; Use of marginally stable systems as analogues of electronic devices; Use of marginally stable systems as sensors and receptors; Out-of-phase external perturbations as stabilization methods; and Double resonance experiments. Author (GRA) N72-13125# Purdue Univ., Lafayette, Ind. Jet Propulsion Center. PENETRATION OF BOUNDARY PERTURBATIONS IN UNSTABLE CHEMICAL SYSTEMS Peter J. Ortoleva (MIT, Cambridge) and John Ross (MIT. Cambridge) Aug. 1971 29 prefs (Contract N00014-67-A-0226-0005; NR Proj. 098-038; Squid Proj.) (AD-728755; SQUID-TR-MIT-59-PU) Avail: NTIS CSCL 07/4 The effects of boundary perturbations of chemical species is investigated in a linear analysis for systems of coupled chemical reactions, with diffusion, which have instabilities. At marginal stability of one of the harmonic modes of such a system the penetration depth of the chemical boundary perturbation coupled to that mode approaches infinity at resonance, that is at the frequency of boundary perturbation equal to the marginal oscillatory frequency of the mode. For the case of equal and diagonal diffusion coefficients for all chemical species the penetration of the perturbation is homogeneous at resonance; unattenuated inhomogeneous penetration occurs in association with symmetry breaking instabilities of the system. The propagation of an impulse boundary perturbation is derived. Some possible applications of the theory are suggested but not demonstrated: Analysis of chemical instabilities; analogies of electronic devices such as tuned amplifiers, transmitters and receivers (chemical radio); communication in aggregates of biological systems; and mechanism of pheromone emission and reception. Author (GRA) N72-13126# Picatinny Arsenal, Dover, N.J. STUDY ON SYNTHESIS OF N-NITROBORAZINE COMPOUNDS. 2: BORAZINE DERIVATIVES T. Hirata Jun. 1971 19 prefs (AD-729339; PA-TM-2011) Avail: NTIS CSCL 07/2 Attempts to synthesize borazine derivatives for use in propellants and related tems are described. Borazine itself was unsuitable as starting material since it has a tendency to polymerize and/or decompose at room temperature; however, B-trimethylborazine is extremely stable from decomposition or attack from air or moisture. Borazine reacted violently with nitryl chloride in the absence of diluent. In solution, the reaction was moderate but vigorous and the borazine appeared to have been completely oxidized. Synthesis and isolation of B-trimethylborazine from B-trichloroborazine and methyl lithium or methyl magnesium chloride proved to be extremely tedious. In addition the yields were much lower than expected. Conditions were varied but yields did not improve. The regeneration of borazine from its solid complex with hydrogen chloride was investigated in order to devise a convenient method for its storage. Author (GRA) |