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  • General Chemistry  (524)
  • Industrial Chemistry  (233)
  • Chemical Engineering  (159)
  • Cell & Developmental Biology  (107)
  • Spacecraft Design, Testing and Performance  (23)
  • 1960-1964  (1,046)
  • 1940-1944
  • 1920-1924
  • 1960  (1,046)
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  • 1960-1964  (1,046)
  • 1940-1944
  • 1920-1924
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  • 1
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2018-03-16
    Description: The thermal-control philosophy of the spacecraft currently under development by the Jet Propulsion Laboratory is design by passive means to maintain all components within the tolerances specified by cognizant engineers. Due to the complexity of the configurations, calculations are) of necessity, fairly generalized and final design is based upon tests in an environmental chamber. The Ranger series spacecraft is designed with a basic structure which is common to all models, with additional hardware to suit the individual mission. This basic structure of Rangers A-1 and A-2 is seen as the hexagonal instrument section, the erectable solar panels, the movable antenna, and the omniantenna. The Ranger A-1 and A-2 configuration is for engineering tests and space-exploration, with the scientific instrumentation isolation requirement dictating the spread-out design. The spacecraft stands 12 feet high, weighs 700 to 800 pounds, and has an internal power of 150 watts. Rangers A-3, A-4, and A-5 are designed to rough land a capsule on the moon. For these, a capsule and retrorocket replace the scientific instruments, occupying the space inside the tower structure. The spacecraft must survive many environments. Chronologically they are: 1) Folded configuration inside an aerodynamic shroud on the pad. 2) Thermal flux from shroud aerodynamically heated during boost phase. 3) Coasting up to 30 minutes attached to Agena stage after booster and shroud are separated. 4) Agena stage burning. 5) Coasting and tumbling after separation from Agena until it passes from earth's shadow. 6) Upon reaching sunlight, panels open and begin sun acquisition. 7) Antenna seeks earth after spacecraft locks onto sun. 8) Space phase- "steady state" with vehicle's vertical axis locked on sun, communicating with earth. The philosophy is to design for the sun-acquired mode, making allowances for the transient conditions.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA Conference on Thermal Radiation Problems in Space Technology: A Compilation of Summaries of the Papers Presented; 41-43
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  • 2
    facet.materialart.
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    In:  CASI
    Publication Date: 2018-03-16
    Description: The radiations that significantly affect the thermal balance of an earth satellite are: (1) Direct solar radiation. (2) Solar radiation reflected from the earth. (3) Thermal radiation from the earth. The total energy and the spectrum of the direct solar radiation are known to adequate accuracy. The solar radiation reflected from the earth is known with considerably less certainty. The earth's average albedo is about 35 percent. Different latitudes, however, have average albedos above or below this value. Furthermore, there is considerable variation with time and place, since the reflectance of solar radiation is determined by the sun's elevation angle, the nature of the terrain (desert, forest, snow, water, etc.) and the weather (absolute humidity, cloudiness, height and nature of clouds, etc.). Accordingly, it would be desirable to have statistically reasonable upper and lower limits for the reflected solar radiation for use in thermal-balance design studies.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA Conference on Thermal Radiation Problems in Space Technology: A Compilation of Summaries of the Papers Presented; 55-57
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  • 3
    Publication Date: 2018-03-16
    Description: The thermal design of the micrometeoroid satellite S-55 involves both experimental and analytical approaches in selecting materials and coatings. A cutaway drawing of the S-55 satellite is shown. The purpose of which is to obtain scientific and engineering design data on the frequency and penetration hazard of micrometeoroids at altitudes between about 250 nautical miles and 700 nautical miles. The passive method of thermal control used involves the selection of materials and coatings that give the desired ratio of absorptivity to emissivity alpha/epsilon for keeping the telemetry temperature within narrow limits and also to prevent overheating of the separate experiments. The selection of a material or coating for this purpose, however, is dictated not only by its absorptivity and emissivity values, but also by its reliability and the constancy of these values under long exposure to the space environment. Several test programs have been conducted in order to evaluate the materials and coatings being considered. Some of these are as follows: (1) Ultraviolet radiation in a vacuum to study discoloration and weight change. (2) Solar radiation in a vacuum to determine maximum equilibrium temperature, discoloration, and weight loss. (3) Thermal cycling and thermal shock to study material integrity (leaking, spalling, melting, etc.). (4) Proton radiation to observe effects on color, crystal structure, and strength. (5) Determination of effects of heat associated with coating application on the leak rate of pressurized parts. (6) Absorptivity and emissivity measurements. The experimental tests outlined and the maximum use of coating methods successfully employed on previous satellites should provide high reliability of the material used for the thermal design of this vehicle. A theoretical analysis was made to determine the values of alpha/epsilon required for different areas in order that the telemetry remain within the desired temperature limits.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA Conference on Thermal Radiation Problems in Space Technology: A Compilation of Summaries of the Papers Presented; 48-51
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  • 4
    facet.materialart.
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    In:  CASI
    Publication Date: 2018-03-16
    Description: A study is under way of a manned orbital space laboratory, some of the purposes of which would be to determine man's adaptability to space and to study structures and systems in space before committing manned spacecraft to long-range missions. It uses an inflatable torus as laboratory and living quarters and has an erectable solar collector as the source of heat for the power plant. The station rotates six times per minute in order to provide some artificial gravity together with stabilization. An escape taxi, which is not shown, is attached to the bottom of the station.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA Conference on Thermal Radiation Problems in Space Technology: A Compilation of Summaries of the Papers Presented; 44-47
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  • 5
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    In:  Other Sources
    Publication Date: 2019-07-12
    Description: The film shows technicians assembling the nose cone on a Saturn model rocket in a test facility. The booster configuration is show. After the nose cone is in place, a meter is attached at the joint and vibration tests are conducted.
    Keywords: Spacecraft Design, Testing and Performance
    Type: L-592
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  • 6
    Publication Date: 2019-08-17
    Description: The problem of sublimation of material and accumulation of heat in an ablation shield is analyzed and the results are applied to the reentry of manned vehicles into the earth's atmosphere. The parameters which control the amount of sublimation and the temperature distribution within the ablation shield are determined and presented in a manner useful for engineering calculation. It is shown that the total mass loss from the shield during reentry and the insulation requirements may be given very simply in terms of the maximum deceleration of the vehicle or the total reentry time.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TR-R-62
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  • 7
    Publication Date: 2019-08-17
    Description: An analytic investigation was made of the dynamic behavior of a nonlifting manned reentry vehicle as it descended through the atmosphere. The investigation included the effects of variations in the aerodynamic stability derivatives, the spin rate, reentry angle, and velocity. The effect of geostrophic winds and of employing a drogue parachute for stability purposes were also investigated. It was found that for the portion of the flight above a Mach number of 1 a moderate amount of negative damping could be tolerated but below a Mach number of 1 good damping is necessary. The low-speed stability could be improved by employing a drogue parachute. The effectiveness of the drogue parachute was increased when attached around the periphery of the rear of the vehicle rather than at the center. Neither moderate amounts of spin or the geostrophic winds had appreciable effects on the stability of the vehicle. The geostrophic winds and the reentry angle or velocity all showed important effects on the range covered by the reentry flight path.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-416 , L-867
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  • 8
    Publication Date: 2019-08-16
    Description: The results of an analysis of the motion and heating during atmospheric reentry of manned space vehicles has shown the following: 1. Flight-corridor depths which allow reentry in a single pass decrease rapidly as the reentry speed increases if the maximum deceleration is limited to 10 g. 2. Use of aerodynamic lift can result in a three-to five fold increase in corridor depth over that available to a ballistic vehicle for the same deceleration limits. 3. Use of aerodynamic lift to widen these reentry corridors causes a heating penalty which becomes severe for values of the lift-drag ratio greater than unity for constant lift-drag entry. 4. In the region of most intense convective heating the inviscid flow is generally in chemical equilibrium but the boundary-layer flows are out of equilibrium. Heating rates for the nonequilibrium boundary layer are generally lower than for the corresponding equilibrium case. 5. Radiative heating from the hot gas trapped between the shock wave and the body stagnation region may be as severe as the convective heating and unfortunately occurs at approximately the same time in the flight.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-334
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  • 9
    Publication Date: 2019-08-15
    Description: A power-off landing technique, applicable to aircraft of configurations presently being considered for manned re-entry vehicles, has been developed and flight tested at Ames Research Center. The flight tests used two configurations of an airplane for which the values of maximum lift-drag ratios were 4.0 and 2.8. Twenty-four idle-power approaches were made to an 8000-foot runway with touchdown point and airspeed accuracies of +/-600 feet and +/-10 knots, respectively. The landing pattern used was designed to provide an explicitly defined flight path for the pilot and, yet, to require no external guidance other than the pilot's view from the cockpit. The initial phase of the approach pattern is a constant high-speed descent from altitude aimed at a ground reference point short of the runway threshold. At a specified altitude and speed, a constant g pull-out is made to a shallow flight path along which the air-plane decelerates to the touchdown point. Repeatability and safety are inherent because of the reduced number of variables requiring pilot judgment, and because of the fact that a missed approach is evident at speeds and altitudes suitable for safe ejection. The accuracy and repeatability of the pattern are indicated by the measured results. The proposed pattern appears to be particularly suitable for configurations having unusual drag variations with speed in the lower speed regime, since the pilot is not required to control speed in the latter portions of the pattern.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-323
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  • 10
    facet.materialart.
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    In:  CASI
    Publication Date: 2019-08-28
    Description: No abstract available
    Keywords: Spacecraft Design, Testing and Performance
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  • 11
    facet.materialart.
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    In:  Other Sources
    Publication Date: 2019-07-12
    Description: The film shows experimental investigations to determine the landing-energy-dissipation characteristics for several types of landing gear for manned reentry vehicles. The landing vehicles are considered in two categories: those having essentially vertical-descent paths, the parachute-supported vehicles, and those having essentially horizontal paths, the lifting vehicles. The energy-dissipation devices include crushable materials such as foamed plastics and honeycomb for internal application in couch-support systems, yielding metal elements as part of the structure of capsules or as alternates for oleos in landing-gear struts, inflatable bags, braking rockets, and shaped surfaces for water impact.
    Keywords: Spacecraft Design, Testing and Performance
    Type: L-540
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  • 12
    facet.materialart.
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    In:  CASI
    Publication Date: 2019-08-27
    Description: The approach to orbital thermal control of the Project Mercury capsule environment is relatively unsophisticated compared with that for many unmanned satellites. This is made possible by the relatively short orbital flight of about 4 1/2 hours and by the presence of the astronaut who is able to monitor the capsule systems and compensate for undesirable thermal conditions. The general external features of the Mercury configuration as it appears in the orbital phase of flight are shown. The conical afterbody is a double-wall structure. The inner wall serves as a pressure vessel for the manned compartment, and the outer wall, of shingle type construction, acts as a radiating shield during reentry. Surface treatment of the shingles calls for a stably oxidized surface to minimize reentry temperatures. The shingles are supported by insulated stringers attached to the inner skin. Areas between stringers are insulated by blankets of Thermoflex insulation. This insulation is especially effective at high altitude due to the reduction of its thermal conductivity with decreasing pressure. As a result of the design of the afterbody for the severe reentry conditions, the heat balance on the manned compartment indicates the necessity for moderate internal cooling to compensate for the heat generation due to human and electrical sources. This cooling is achieved by the controlled vaporization of water in the cabin and astronaut-suit heat exchangers.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA Conference on Thermal Radiation Problems in Space Technology: A Compilation of Summaries of the Papers Presented; 52-54
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  • 13
    Publication Date: 2019-08-15
    Description: This report gives the results of an investigation on the transition from spin about the axis of minimum moment of inertia to spin about the axis of maximum moment of inertia by dissipation of internal mechanical energy. A mathematical discussion, together with charts and diagrams, shows that angular velocities and nutation angle are dependent on the energy and symmetry factors. The low stability of rotation about the axis of maximum moment of inertia, when this inertia is only slightly greater than the mean moment of inertia, is shown.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-596
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  • 14
    Publication Date: 2019-08-15
    Description: The dimensionless, transformed, nonlinear differential equation developed in NASA TR R-11 for describing the approximate motion and heating during entry into planetary atmospheres for constant aerodynamic coefficients and vehicle shape has been modified to include entries during which the aerodynamic coefficients and the vehicle shape are varied. The generality of the application of the original equation to vehicles of arbitrary weight, size, and shape and to arbitrary atmospheres is retained. A closed-form solution for the motion, heating, and the variation of drag loading parameter m/C(D)A has been obtained for the case of constant maximum resultant deceleration during nonlifting entries. This solution requires certain simplifying assumptions which do not compromise the accuracy of the results. The closed-form solution has been used to determine the variation of m/C(D)A required to reduce peak decelerations and to broaden the corridor for nonlifting entry into the earth's atmosphere at escape velocity. The attendant heating penalty is also studied.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-319
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  • 15
    Publication Date: 2019-08-15
    Description: Analytical and experimental investigations have been made to determine the landing-energy-dissipation characteristics for several types of landing gear for manned reentry vehicles. The landing vehicles are considered in two categories: those having essentially vertical-descent paths, the parachute-supported vehicles, and those having essentially horizontal paths, the lifting vehicles. The energy-dissipation devices discussed are crushable materials such as foamed plastics and honeycomb for internal application in couch-support systems, yielding metal elements as part of the structure of capsules or as alternates for oleos in landing-gear struts, inflatable bags, braking rockets, and shaped surfaces for water impact. It appears feasible to readily evaluate landing-gear systems for internal or external application in hard-surface or water landings by using computational procedures and free-body landing techniques with dynamic models. The systems investigated have shown very interesting energy-dissipation characteristics over a considerable range of landing parameters. Acceptable gear can be developed along lines similar to those presented if stroke requirements and human-tolerance limits are considered.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-453 , L-1082
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  • 16
    Publication Date: 2019-08-15
    Description: The state of the design art for inflated structures applicable to reentry vehicles is discussed. Included are material properties, calculations of buckling and collapse loads, and calculations of deflections and vibration frequencies. A new theory for the analysis of inflated plates is presented and compared with experiment.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-457 , L-1080
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  • 17
    Publication Date: 2019-08-15
    Description: Noise measurements pertaining mainly to the static firing, launch, 0 and exit flight phases are presented for three rocket-powered vehicles 4 in the Project Mercury test program. Both internal and external data 4 from onboard recordings are presented for a range of Mach numbers and dynamic pressures and for different external vehicle shapes. The main sources of noise are noted to be the rocket engines during static firing and launch and the aerodynamic boundary layer during the high-dynamic-pressure portions of the flight. Rocket-engine noise measurements along the surface of the Mercury Big Joe vehicle were noted to correlate well with data from small models and available data for other large rockets. Measurements have indicated that the aerodynamic noise pressures increase approximately as the dynamic pressure increases and may vary according to the external shape of the vehicle, the highest noise levels being associated with conditions of flow separation. There is also a trend for the aerodynamic noise spectra to peak at higher frequencies as the flight Mach number increases.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-450
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  • 18
    Publication Date: 2019-08-15
    Description: This report presents a theory of oblateness perturbations of the orbits of artificial satellites based on Hansen's theory, with modification for adaptation to fast machine computation. The theory permits the easy inclusion of any gravitational terms and is suitable for the deduction of geo-physical and geodetic data from orbit observations on artificial satellites. The computations can be carried out to any desired order compatible with the accuracy of the geodetic parameters.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-492
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  • 19
    Publication Date: 2019-08-15
    Description: An investigation of the low-subsonic-speed static longitudinal stability and control characteristics of a model of a manned reentry-vehicle configuration capable of high-drag reentry and glide landing has been a made in the Langley free-flight tunnel. The model had a modified 63 deg delta plan-form wing with a fuselage on the upper surface. This configuration had wingtip panels designed to fold up 90 deg for the high-drag reentry phase of the flight and to extend horizontally for the glide landing. Data for the basic configurations and modifications to determine the effects of plan form, wingtip panel incidence, dihedral, and vertical position of the wingtip panels are presented without analysis.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TM-X-227 , L-747
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  • 20
    Publication Date: 2019-08-15
    Description: During the re-entry phase of a manned satellite, some equipment for continuous on-board indication of position will be required. Since radio and radar may be useless during part of the re-entry, inertial guidance equipment may be required. Such equipment, however, has an inherent instability in the computation of altitude. The present study of an inertial guidance system shows that for reasonable values of initial-condition errors and equipment biases. the resultant position indication errors will not become excessive unless the re-entry maneuver time is greater than 45 minutes to an hour. Further, the position indication error caused by accelerometer uncertainties can be reduced by switching off the accelerometers until their output becomes significantly greater than their uncertainty.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-322
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  • 21
    Publication Date: 2019-08-15
    Description: The basic structural approaches for dealing with reentry heating of manned vehicles are summarized. The weight and development status of both radiative and ablative shields are given and the application of these shields to various vehicles is indicated.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TM-X-313
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  • 22
    Publication Date: 2019-08-15
    Description: A large structural model of a reentry vehicle has been built incorporating design concepts applicable to a radiation-cooled vehicle. Thermal-stress alleviating features of the model are discussed. Environmental tests on the model include approximately 100 cycles of loading at room temperature and 33 cycles of combined loading and-heating up to temperatures of 1,6000 F. Measured temperatures are shown for typical parts of the model. Comparisons are made between experimental and calculated deflections and strains. The structure successfully survived the heating and loading environments.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TM-X-314
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  • 23
    Publication Date: 2019-08-16
    Description: The use of inertia wheels to control the attitude of a satellite has currently aroused much interest. The stability of such a system has been studied in this investigation. A single-degree-of-freedom analysis indicates that a response with suitable dynamic characteristics and precise control can be achieved by commanding the angular velocity of the inertia wheel with an error signal that is the sum of the attitude error, the attitude rate, and the integral of the attitude error. A digital computer was used to study the three-degree-of-freedom response to step displacements, and the results indicate that the cross-coupling effects of inertia coupling and precession coupling had no effect on system stability. A study was also made of the use of a bar magnet to supplement the inertia wheels by providing a means of removing any momentum introduced into the system by disturbances such as aerodynamic torques. A study of a case with large aerodynamic torques, with a typical orbit, indicated that the magnet was a suitable device for supplying the essential trimming force. Single-degree-of-freedom bench tests generally verified the dynamic response predicted by the analytical study. the test table to within plus or minus 9 arc-seconds of the reference direction, even though the hardware components that were used in these tests were not specifically designed for the control system.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA-TN-D-626 , L-1160
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  • 24
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 25
    Electronic Resource
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    New York, NY : Wiley-Blackwell
    Journal of Morphology 106 (1960) 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 26
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    Journal of Morphology 106 (1960), S. 85-108 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 27
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 28
    Electronic Resource
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    Journal of Morphology 106 (1960) 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 29
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 30
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    Journal of Morphology 107 (1960), S. 1-23 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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  • 31
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    Journal of Morphology 107 (1960), S. 123-140 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 32
    Electronic Resource
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    Journal of Morphology 107 (1960) 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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  • 33
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    Topics: Biology , Medicine
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  • 34
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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  • 35
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    Topics: Biology , Medicine
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  • 36
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    Journal of Morphology 107 (1960), S. 151-151 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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  • 37
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    Journal of Morphology 107 (1960), S. 227-232 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    Topics: Biology , Medicine
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  • 38
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    Topics: Biology , Medicine
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  • 39
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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  • 40
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    Journal of Morphology 106 (1960), S. 77-83 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 41
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
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  • 42
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    Journal of Morphology 106 (1960), S. 197-203 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 43
    ISSN: 0362-2525
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    Journal of Morphology 107 (1960), S. 25-45 
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    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    Journal of Morphology 107 (1960), S. 93-121 
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    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    Journal of Morphology 107 (1960), S. 141-161 
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    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    Topics: Biology , Medicine
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    Journal of Morphology 106 (1960), S. 1-76 
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    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    Topics: Biology , Medicine
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    Journal of Morphology 106 (1960) 
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    Journal of Morphology 107 (1960) 
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    Journal of Morphology 107 (1960), S. 61-77 
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    Journal of Morphology 107 (1960) 
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    Journal of Morphology 107 (1960), S. 205-225 
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    Journal of Morphology 107 (1960), S. 233-257 
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    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
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    ISSN: 0362-2525
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  • 59
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    AIChE Journal 6 (1960) 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 60
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    AIChE Journal 6 (1960), S. 168-170 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
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    Notes: In 1954 Becker found that the components of a gas mixture could be separated by allowing a jet of the gas mixture to expand in a low-pressure chamber. The heavier molecules would concentrate near the center of the jet and the lighter ones near the edge. Thus the jet could be split into two streams, one containing more of the heavy component and one containing more of the light component. In this paper it will be shown that this effect can be predicted from the kinetic theory of gases and that the predicted magnitude of the effect agrees favorably with the experimental data of Becker.
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    AIChE Journal 6 (1960), S. 173-174 
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    Keywords: Chemistry ; Chemical Engineering
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  • 62
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
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    Notes: No abstracts.
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    AIChE Journal 6 (1960), S. 97-104 
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    Keywords: Chemistry ; Chemical Engineering
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    Notes: From studies of annular packed beds wherein the heat flows purely radially, the authors obtained the coefficients of heat transfer on the inner tube surface, as well as the mean effective thermal conductivities of bed. The inner and outer diameters of the annular packed bed were 22 and 70 mm. respectively, and the packings shown in Table 1 were used. The wall film coefficients obtained with air flowing axially through the bed were correlated for NReM 〈 600 by means of Equation (14).The coefficients of heat transfer for cylindrical packed beds reported previously by other observers were correlated also by Equation (14), with 0.054 used for values of αω in the range NReM 〈 2,000.Consideration of Equation (14) in terms of a theoretical model of heat transfer showed that it was reasonable to apply it for the prediction of wall film coefficient, especially for low Reynolds numbers.
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    AIChE Journal 6 (1960), S. 128-129 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pressure-volume-temperature measurements have been made on methyl borate over the temperature range of 2257deg; to 300°C. and pressures of 30 to 200 atm. in a variable volume P-V-T bomb. Vapor-pressure measurements from 180°C. to the critical point have also been made with the same apparatus. The vapor-pressure data are presented in the form of the Antoine equation, and the P-V-T data together with the vapor-pressure data have been fitted to the Benedict-Webb-Rubin equation of state.
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    AIChE Journal 6 (1960), S. 139-144 
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    Keywords: Chemistry ; Chemical Engineering
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The behavior of type-304 stainless steel in a forced-convection closed-loop lithium system was investigated over a wide range of temperatures and velocities. Fundamental information concerning the mechanism for mass transport has been obtained by examining solution and deposition effects along flat plates. The rate-determining process for solution is transport from the solid to the interface, whereas deposition rates are liquid-phase controlled.Liquid-phase mass transfer coefficients were correlated with a maximum deviation of approximately 15% by the use of von Kàrmàn's analysis of the turbulent boundary layer along a flat plate, combined with the Chilton-Colburn empirical modification of the Schmidt group. In contrast no adequate model is available for the prediction of solution rate constants which must be determined experimentally. Mean values of the solution rate constants ranged from 0.154 to 0.750 × 10-5 cm./sec. at temperatures from 510° to 612°C. These values are on the order of 103 smaller than corresponding liquid-phase mass transfer coefficients.
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    AIChE Journal 6 (1960), S. 163-167 
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    Keywords: Chemistry ; Chemical Engineering
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    Notes: A study was made of the deviation between the temperature of thermocouple junctions and the temperature of the fluid surrounding them which arises as a result of conduction along the thermocouple leads. Measurements around a 1/2-in. heated sphere in the plane of the equator normal to an air stream having a velocity of 16 ft./sec. were made with a 0.001-in.-diam. thermocouple of platinum and platinum rhodium. Air temperatures in the boundary flows of the sphere were predicted from the indications of the thermocouple. The method of prediction employed also determined the heat transfer coefficients for the thermocouple wire in the boundary layer. These local heat transfer coefficients are lower than those observed in a uniform stream having a velocity equal to the estimated local velocity in the boundary layer.
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    AIChE Journal 6 (1960), S. 171-172 
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    Keywords: Chemistry ; Chemical Engineering
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    AIChE Journal 6 (1960), S. 176 
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    Notes: The Chemical Engineering Progress Symposium Series is composed of papers on specific subjects conveniently bound in individual books, which are published at intervals. The books are 8 1/2 by 11 inches, paper covered, and cost as follows: “Adsorption, Dialysis, and Ion Exchange,” $3.50 to members, $4.50 to nonmembers; “Nuclear Engineering Part VI,” $3.50 to members, $4.50 to nonmembers. They may be ordered from the Secretary's Office, the American Institute of Chemical Engineers, 25 West 45 Street, New York 36, New York.The A. I. Ch. E. Journal will publish, from time to time, abstracts of the articles appearing in the Symposium Series volumes.
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    AIChE Journal 6 (1960), S. 174-175 
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    Keywords: Chemistry ; Chemical Engineering
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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    AIChE Journal 6 (1960), S. 5M 
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    Keywords: Chemistry ; Chemical Engineering
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: No abstracts.
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    AIChE Journal 6 (1960), S. 177-177 
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    Keywords: Chemistry ; Chemical Engineering
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    AIChE Journal 6 (1960), S. 197-201 
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    Keywords: Chemistry ; Chemical Engineering
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    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Concurrent flow in gas absorption may be used to practical advantage when liquid partial pressure is minor. The higher transfer coefficients of this operation are reported and analyzed in reference to pertinent variables.
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    AIChE Journal 6 (1960), S. 202-206 
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    Notes: A first approximation to the multicomponent plate-efficiency problem has been carried out with a film model combined with equations for steady state diffusion in a ternary gas mixture. Numerical integration of the equations through a plate yields the ternary efficiencies as functions of the binary efficiency.The effects of diffusional interactions in a distillation column were studied by computing the efficiencies on each plate when a column is designed to separate a ternary mixture. In the example studied, the average column efficiency was 39% less than the binary efficiency.Some criteria are suggested for comparing other multicomponent systems to the one studied in order to estimate the uncertainty in the use of binary correlations for these systems.
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    AIChE Journal 6 (1960), S. 240-245 
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    Keywords: Chemistry ; Chemical Engineering
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    Notes: A new correlation is presented for predicting the pressure-volume temperature relations of nonpolar (and slightly polar) gases. The correlation modifies the law of corresponding states in which a third parameter, the slope of the pseudocritical isometric in dimensionless form, is introduced. This parameter is introduced in a simple manner by multiplying the reduced pressure and temperature of the gas by a factor which can be easily calculated or read from a graphs. This gives the corrected reduced pressure and temperature which can then be used with a generalized compressibility factor chart in place of the true values. The correlation is accurate for densities up to about 1.2 times the critical density.A detailed comparison of the method with data on twelve pure gases showed that by introducing this parameter into the law of corresponding states the average error was decreased from 1.598 to 0.320%. The parameter S can readily be determined from experimental PVT data, and only one isotherm is required. S is related to the vapor-pressure curve for a substance as characterized by the critical pressure and the ratio of the critical temperature to the normal boiling temperature, and a simple method is proposed for predicting S when no experimental data are available.A new set of generalized compressibility factor and fugacity to pressure ratio charts is presented for use with the proposed correlation. A method is also presented for determining the thermodynamics functions.
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    AIChE Journal 6 (1960), S. 406-410 
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    Keywords: Chemistry ; Chemical Engineering
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    AIChE Journal 6 (1960), S. 419-426 
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    Keywords: Chemistry ; Chemical Engineering
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    Notes: The production of essentialy homogeneous sluries involves both initial solids suspension and expension of the particle bed to fill the container. When geometry and solids concentration are held constant, both phenomena are found to be controlled by similar dimensionless groupings of power per unit volume, density, and relative velocity between the fluid and particle. The dimensionless group applicable to bed expansion is shown to be consistent with hydro-dynamic theory. Design equations for use with the paddle type of impeller are presented.
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    AIChE Journal 6 (1960), S. 438-442 
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    Notes: Experimental data, believed accurate within ±0.5%, are presented for pressures of 100 to 8,000 Ib./sq. in. abs. for nine temperatures from 77° to 280°F. One isotherm, within 1° of the critical, indicates the detail required in further investigation of the critical region. These data were combined with the available literature values to prepare a table of recommended viscosity values with maximum uncertainty of ±2% for temperatures from 70° to 460°F. Two generalized correlations and the Enskog viscosity theory for dense gases exhibit significant errors in predicting the data. Methods are suggested for extrapolation of the values to higher temperatures and pressures.
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    AIChE Journal 6 (1960), S. 460-463 
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    Notes: The process of fluid-particle mass transfer in fixed beds at Reynolds numbers less than 1,000 is viewed in terms of transient molecular diffusion within a boundary layer which is developed and destroyed repeatedly as the fluid journeys through the bed. Literature data support the j factor derived from the premises of the model. The theory predicts a Schmidt number exponent of 2/3 for NSc ≧ 1; however this exponent should approach 1/2 for NSc 〈 1.
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    AIChE Journal 6 (1960), S. 482-487 
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    Keywords: Chemistry ; Chemical Engineering
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    Notes: A new fluid-solid contacting technique known as Semifluidization has been studied. Mass transfer data were obtained for a benzoic acid-water system, and correlations in terms of mass transfer factors and over-all void fractions (for both packed and fluidized sections) are presented. Previous mass transfer correlations for fixed and fluidized beds are critically evaluated with respect to the limitation and applicability and are discussed in relation to semifluidized-bed mass transfer correlations.
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    AIChE Journal 6 (1960), S. 501-505 
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    Notes: Detonation velocities of hydrogen-oxygen mixtures were measured for initial pressures from 14.4 to 1,000 lb./sq. in. abs. and compositions from 40 to 80 mole % molecular hydrogen. Detonation and impact characteristics were computed for essentially the same range of conditions by the use of the elementary theory of detonation. Equilibrium compositions of hydrogen-oxygen mixtures at pressures from 10 to 2,000 atm. and temperatures from 3,000 to 5,000°K. were included in the computations and have been filed with the American Documentation Institute. The effect of nonideal thermodynamic properties on the computed detonation velocities was considered.
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    AIChE Journal 6 (1960), S. 528-528 
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    Keywords: Chemistry ; Chemical Engineering
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    AIChE Journal 6 (1960), S. 2S 
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    Notes: No abstracts.
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    AIChE Journal 6 (1960), S. 525-527 
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    AIChE Journal 6 (1960), S. 619-624 
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    Keywords: Chemistry ; Chemical Engineering
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    Notes: Liquid-liquid extraction of acetic acid from the methyl isobutyl ketone-water system was studied as a function of plate wetting characteristics and other variables in a pulsed perforated-plate extraction column.Various combinations of stainless steel plates and polyethylene plates were used with different directions of solute transfer at a constant throughput of 82.6 lb. total flow/(min.) (sq. ft. column area) and with other operating variables in the following range:Frequency  -  16 to 117.1 c./min.Amplitude  -  0.492 and 0.973 in.W/K flow ratio  -  0.46 to 2.8 lb. water/lb. ketoneThe plate wetting characteristics were found to affect the column extraction efficiency when the solute transfer was from the continuous ketone phase to water. An all polyethylene plate arrangement provided the best efficiency (H. T. U.oc = 4.1 in.) while an all stainless steel plate arrangement was less efficient (H. T. U.oc = 6.1 in.) under the most favorable operating conditions. A combination of these two arrangements in the column produced efficiencies midway between the all-plastic plate arrangement and the all-stainless steel plate arrangement.Within the column flooding limits the extraction efficiency did not seem to be affected by the plate wetting characteristics when the solute transfer was from water to the continuous ketone phase.
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    AIChE Journal 6 (1960), S. 631-639 
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    Keywords: Chemistry ; Chemical Engineering
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    Notes: Heat transfer and pressure-drop measurements were made with non-Newtonian aqueous thorium oxide suspensions. A comparison of the results of the two different kinds of measurement allowed the general features of non-Newtonian thorium oxide suspension heat transfer to be readily identified, thus leading to a clear understanding of anomalies observed in previous suspension heat transfer studies.Data were obtained at suspension concentrations up to 0.10 volume fraction solids, (1,000 g. of thorium/kg. of water) in systems having tube diameters of 0.318 and 1.030 in. In addition laminar-flow data were taken with a capillary-tube viscometer with a tube diameter of 1/8 in. and an L/D of 1,000. It was shown that laminar flow physical properties determined with the 1/8 in. diameter tube were satisfactory for correlating data taken with tubes up to 1.030 in. in diameter.Until the present study information was not available which would permit a choice between two different viscosities for use in correlating non-Newtonian turbulent heat transfer and flow data. The limiting viscosity at very high shear rates is shown to give a unique correlation of turbulent data for tube diameters from 0.124 to 1.030 in., whereas the use of the effective viscosity (that is the viscosity evaluated at the point value of the wall shear stress corresponding to each given flow condition) gives a pronounced diameter effect in turbulent-flow correlations.The data show that the onset of turbulence for both the pressure-drop and heat transfer measurements occurs at the same Reynolds number and is approximated by the value predicted by the Hedstrom criterion (II). The heat transfer transition region extends to Reynolds numbers a factor of four times greater than the critical, as is also the case with Newtonian materials. Heat transfer to thorium oxide slurries in fully developed turbulent flow is the same as that predicted by the usual correlations for Newtonian fluids to within the precision of the experimental data, provided that the Reynolds and Prandtl numbers are calculated with the limiting viscosity at high rates of shear, η, for this viscosity. An approximate form of Martinelli's momentum heat transfer analogy correlates the experimental results within +17 and -36%.
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  • 86
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    AIChE Journal 6 (1960), S. 669-675 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: By means of a moveable sensing probe previously described2 local shell-side heat transfer coefficients and friction losses were measured on a model tubular heat exchanger containing orifice baffles. The heat exchanger shell was 6-in. nominal I.D. and 45 in. in length and contained four tubes in triangular arrangement passing through orifice baffles. Baffle hole diameters of 1-/16, 1-2/16, 1-3/16, and 1-5/16 in. and baffle spacings of 4.0 and 9.0 in. were studied. Data were taken at several air flow rates for each of the four baffle hole diameters.The average heat transfer coefficient for the region between two central baffles was correlated with an empirical equation based on only two baffle spacings.An increase in the baffle-to-tube clearance caused a decrease in heat transfer. An increase in the baffle spacing also resulted in a decrease in heat transfer. Four flow zones in the baffle space are postulated from the analysis of Nusselt number distribution along the tube. The heat transfer characteristics in each of the four flow zones were analyzed in terms of the mechanism of the fluid flow.The pressure-drop data were correlated in terms of an annular orifice coefficient of discharge and an orifice-pressure-drop function. As a result of this study a method was developed by which one can predict the average of the local coefficients at the baffle position from the knowledge of pressure drop across a single baffle.
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  • 87
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    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 688-692 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The paper reports fundamental observations on the effect which stirring of fluidized solids has on the pressure drop. Typical power requirements are also given.The experimental pilot unit was of 6-in. diameter and 12 in. high. A special blade or paddle type of stirrer had been built which permitted the evaluation of the effects of blade positioning, blade spacing relative to sense of rotation, as well as the effect of stirrer immersion and rotational speed.The observations disclosed that blade positioning relative to sense of rotation had a very profound effect on pressure drop as well as on power requirements. When the solids circulation pattern as normally induced by the stirrer was of the same general character as that ordinarily encountered in a dense phase fluidized charge, the resulting pressure drop was always considerably lower than the conventional unstirred fluidized bed pressure drop. Furthermore for this type of stirrer the power requirements were also lowest. For other stirrer designs and other induced solids convection patterns the pressure drop was less influenced and the power requirements were much greater.The solids used for the study were a relatively coarse silica sand for which both pressure drop as well as power requirement data were reported. Power requirement data were also obtained for a much finer alumina powder. When one emphasized the effect which particle properties, especially surface characteristics may have the level of the power data was much lower, although the data were of the same character as the characteristic values pertaining to the sand.
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  • 88
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    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 579-584 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Mass transfer rates have been measured at 30°C. over a Reynolds number range of 1 to 130 for the solution of 3/8-in. diameter spheres of benzoic acid for both upflow and downflow streams. These are compared with similar results for 3/4-in. diameter spheres and show a gradual transition from forced to free convection. The interaction between the two effects is complex but less marked for the smaller spheres. Free convective effects do not disappear entirely until a Reynolds number of about 250 for the 3/8-in. spheres, compared with a value of 750 given for 3/4-in. spheres in the previous work (6).
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  • 89
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    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 602-605 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Experimental data are presented to show the points of incipient hydrate formation in the methane-propylene-water system. The addition of 1.4% propylene to methane lowered the equilibrium pressure 400 lb./sq. in. at 50°F. The locus of the four-phase equilibrium consisting of hydrate, vapor, water-rich liquid, and hydrocarbon-rich liquid was determined. This was terminated by the appearance of a critical condition at 1,370 lb./sq. in. abs. and 69.3°F., where the vapor phase contained 34.8% propylene on a dry basis. Below this pressure the hydrate, vapor, water-rich liquid equilibrium does not exist for solutions containing more than about 25% propylene. Solid-vapor equilibrium ratios were estimated for propylene hydrates. The significant features of the phase diagrams for the system are discussed in some detail.
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  • 90
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    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 55-58 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In this investigation of the effect of a cylindrical boundary on a spherical particle suspended in a moving viscous fluid the pressure drop due to the motion of fluid past a stationary sphere and the drag on the sphere are independently measured, and the sphere- to-cylinder-diameter ratios varying from 0.1250 to 0.3125 are studied at different positions of eccentricity. The investigation shows that in the range of Reynolds numbers from 0.1 to 40.0, based on the approach velocity to the sphere and the diameter of the sphere, the pressure drop due to the presence of a sphere and the drag on it can be represented by a semiempirical relationship containing two terms. One term, owing to the effect of the cylindrical boundary, is derived theoretically from the creeping-motion equations which neglect inertial effects. The second term, owing to the inertial effects, is established from data on the drag coefficient of a sphere in on unbounded medium.
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  • 91
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    AIChE Journal 6 (1960), S. 332-335 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A correlating equation for selective adsorption in the liquid phase has been extended to predict accurately the benzene-cyclohexane equilibrium data on silica gel. Gel pore diameters range from approximately 25 to 150 Å. and temperatures between the boiling and freezing points of the pure components.
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  • 92
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    AIChE Journal 6 (1960), S. 343-344 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Tab.
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  • 93
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    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 347-350 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
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  • 94
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    AIChE Journal 6 (1960), S. 129-133 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The purpose of this investigation was to determine the interaction effect of one spherical particle upon another when both are falling in a viscous fluid. The velocities of two identical spheres, falling along the axis of a cylinder in a direction parallel to their line of centers, were measured experimentally as a function of the center-to-center distance between them at very low Reynolds numbers. The experimental results compared very well with theoretical studies found in the literature which predicted that two spheres will fall faster than one sphere.At Reynolds numbers greater than 0.25 the influence of inertial effects were studied for one end two spheres. The experimental results qualitatively confirmed the Oseen equations. A definite attraction between two spheres falling one above the other was observed; the inertial forces acted to slow down the lower sphere without affecting the upper one.
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  • 95
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    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 150-153 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel type of piezometer used to measure the compressions of liquids from 20° to 300°C. and from 1 to 4,000 kg./sq. cm. is described. The accuracy anticipated is 4 parts in 10,000.
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  • 96
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    AIChE Journal 6 (1960), S. 153-156 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: New measurements of the volumes of liquid n-alkanes of 7, 9, 11, 13, 17, 20, 30, and 40 carbon atoms over a range of temperatures from 20° to 300°C. and pressures from 0 to 4,000 kg./sq. cm. have been made. These volume measurements are here reduced to compressions (volpT)/(vol°T), and the accuracy of the measurements has been determined. Analysis of the data for n-heptane and n-eicosane shows that the order of accuracy of the compressions of each of these compounds appears to be approximately 3 parts in 10,000. Evaluation of random multiple measurements on the remaining six compounds indicates that their over-all accuracy is likewise of this same order.
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  • 97
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    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 304-311 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Experiments were carried out with cylindrical thermal-diffusion columns in which the separation chambers were sufficiently narrow so that curvature effects might be ignored. For both open and closed operation, results were obtained for the two binary systems benzene-carbon tetrachloride and n-heptane-benzene as well as the ternary mixture n-heptane-methylcyclo-hexane-toluene. For the binary systems, correlations are given in terms of dimensionless combinations which arise when the equations of conservation are placed in dimensionless form. The thermal-diffusion coefficients used in the correlations are literature values determined in steady-state-cell (no convection) measurements.
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  • 98
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    AIChE Journal 6 (1960), S. 494-500 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pure phosgene gas was dissolved in short laminar jets of aqueous solution, and the results were interpreted with an unsteady state absorption-plus-reaction theory. Absorption rates of sulfur dioxide and carbon dioxide into water in the same equipment support this interpretation. The solubility of phosgene in water at 25°C. has been estimated from the absorption rates as 0.069 g.mole/(liter) (atm.). The estimated heat of solution is 6,800 cal./g.mole. At 16° and 25°C. the effect of a chemical reaction between phosgene and water on the absorption rate in a jet appears to be almost negligible, but at 45°C. a first-order reaction rate constant of 75 sec.-1 can be derived from the absorption rates.From absorption measurements with short jets and sodium hydroxide solutions so strong that a pseudo-first-order reaction accompanied absorption, the reaction rate constant for the bimolecular reaction between dissolved phosgene and the hydroxyl ion was estimated. A value of 1.6 × 104 liters/(g. mole) (sec.) was obtained at 25°C. in 1-N sodium hydroxide; at 35°C. in the same solution the estimated value was 2.9 × 104. There appears to be a slight increase in the reaction-rate constant with the ionic strength of the solution.
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  • 99
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    AIChE Journal 6 (1960), S. 510-516 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The results of an investigation of heat transfer and reaction kinetics in a fixed-bed catalytic reactor of slab geometry are described. The particular reaction studied is the air oxidation of nitric oxide with silica gel. Conversions and catalyst-bed temperatures were observed in the experimental, nonisothermal slab reactor, but only a sample of these data are reported and analyzed here.A mathematical analysis of the processes occurring in a slab reactor has been developed which leads to a design method for such reactors that permits prediction of catalyst-bed temperatures and conversions from a knowledge of specific reaction rates and the physical properties of the system. The design method involves a step-by-step procedure but requires a small number of steps. To evaluate the accuracy of the design method and to illustrate its use, the specific reaction-rate data together with published thermal-conductivity data have been used with the method to predict the results of a run on the experimental nonisothermal reactor. Good agreement between calculated and observed temperatures and conversions was obtained.Specific reaction rates, derived from integral conversions in an experimental, isothermal reactor, are reported.
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  • 100
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    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 3S 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The Chemical Engineering Progress Symposium Series is composed of papers on specific subjects conveniently bound in individual books, which are published at intervals. The books are 8 1/2 by 11 inches, paper covered, and cost $3.50 to members, $4.50 to nonmembers. They may be ordered from the Secretary's Office, the American Institute of Chemical Engineers, 25 West 45 Street, New York 36, New York.The A. I. Ch. E. Journal will publish, from time to time, abstracts of the articles appearing in the Symposium Series volumes. Recently published volumes are abstracted below.
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