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  • Chemistry  (1,632)
  • General Chemistry  (458)
  • Cell & Developmental Biology  (142)
  • Aerodynamics  (14)
  • ASTROPHYSICS
  • GEOPHYSICS
  • 1990-1994
  • 1970-1974
  • 1950-1954  (1,788)
  • 1952  (1,788)
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  • 1990-1994
  • 1970-1974
  • 1950-1954  (1,788)
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  • 1
    Publication Date: 2019-06-28
    Description: The transonic similarity rules have been applied to the correlation of experimental data for a series of 22 rectangular wings having symmetrical NACA 63A-series sections, aspect ratios from 1/2 to 6, and thicknesses from 2 to 10 percent. The data were obtained by use of the transonic bump technique over a Mach number range from 0.40 to 1.10, corresponding to a Reynolds number range from 1.25 to 2.05 million. The results show that it is possible to correlate experimental data throughout the subsonic, transonic, and moderate supersonic regimes by using the transonic similarity parameters in forms which are consistent with the Prandtl-Glauert rule of linearized theory. The multiple families of basic data curves for the various aspect ratios and thickness ratios have been summarized in single presentations involving only one geometric variable - the product of the aspect ratio and the l/3 power of the thickness ratio.
    Keywords: Aerodynamics
    Type: NACA-RM-A51L17b
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  • 2
    Publication Date: 2019-06-27
    Description: An investigation of the isothermal wake-flow characteristics of several flame-holder shapes was carried out in a 4- by 4-inch flow chamber. The effects of flame-holder-shape changes on the characteristics of the Karman vortices and thus on the recirculation zones to which experimenters have related the combustion process were obtained for several flame holders. The results may furnish a basis of correlation, of combustion efficiency and stability for similarly shaped flame holders in combustion studies. Values of the spacing ratio-(ratio of lateral spacing to longitudinal spacing of vortices] obtained for the various shapes approximated the theoretical value of 0.36 given by the Karman stability analysis. Variations in vortex strength of more than 200 percent and in frequency of more than 60 percent were accomplished by varying flame-holder shape. A maximum increase in the recirculation parameter of 56 percent over that for a conventional V-gutter was also obtained. Varying flameholder shape and size enables the designer to select many schedules of variations in vortex strength and frequency- not obtainable by changing size only and may make it possible to approach theoretical maximum vortex strength for any given frequency.
    Keywords: Aerodynamics
    Type: NACA-RM-E51K07 , E-2403
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  • 3
    Publication Date: 2019-07-11
    Description: A l/4-scale dynamically similar model of the XFV-1 airplane has been flown in the Ames 40- by 80-foot wind tunnel, using the trailing flight-cable technique. This investigation was devoted to establishing the flight characteristics of the model in forward flight from hovering to wing stall, and in yawed flight (wing span alined with the relative wind) from hovering to the maximum speed at which controlled flight could be maintained. Landings, take-offs, and hovering characteristics in flights close to the ground were also investigated.. Since the remote control system for the model was rather complicated and provided artificial damping about the pitch, roll, and yaw axes, sufficient data from the control-system calibration tests are included in this report to specify the performance of the control system in relation to both the model flight tests and the design of an automatic control system for the full-scale airplane. The model in hovering flight appeared to be neutrally stable. The response of the model to the controls was very rapid, and it was always necessary to provide some amount of artificial damping to maintain control. The model could be landed with little difficulty by hovering approximately a foot above the floor and then cutting the power. Take-offs were more difficult to perform, primarily because the rate of change in power to the model motors was limited by the characteristics of the available power source. The model was,capable of controlled yawed flight at translational velocities up to and including 20 feet per second. The effectiveness of the controls decreased with increasing speed, however, and at 25 fps control in pitch, and probably roll, was lost completely. The model was flown in controlled forward flight from hovering up to 70 fps. During these flights the model appeared to be more difficult to control in yaw than it was in pitch or roll. The flights of the model were recorded by motion picture cameras. These motion pictures are available on loan from NACA Headquarters as a film supplement to this report.
    Keywords: Aerodynamics
    Type: NACA-RM-SA52J15
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  • 4
    Publication Date: 2019-07-11
    Description: A small-scale transonic investigation of two semispan wings of the same plan form was made in the Langley high-speed 7- by 10-foot tunnel through a Mach number range of 0.70 to 1.10 and a mean-test Reynolds number range of 745,000 to 845,000 to determine the effects of partial-span leading-edge camber on the aerodynamic characteristics of a swept-back wing. This paper presents the results of the investigation of wing-alone and wing-fuselage configurations of the two wings; one, was an uncambered wing and the other had the forward 45 percent of the chord cambered over the outboard 55 percent of the span. The semispan wings had 50deg 38ft sweepback of their quarter-chord lines, aspect ratio of 2.98, taper ratio of 0.45, and modified NACA 64A-series airfoil sections tapered in thickness ratio. Lift, drag, pitching moment, and root-bending moment were obtained for these configurations. The results indicated that, for the wing-alone configuration, use of the partial-span leading-edge camber provided an increase in maximum lift-drag ratios up to a Mach number of 0.95, after which no gain was realized. For the wing-fuselage combination, the partial-span leading-edge camber appeared to cause no gain in maximum lift-drag ratio throughout the test range of Mach numbers. The lift-curve slopes of the partial-span leading-edge camber configurations indicated no significant change over the basic configurations in the subsonic range but resulted in slight reductions at the higher Mach numbers. No significantly large changes in pitching-moment-curve slopes or lateral center of additional loading were indicated because of the modification.
    Keywords: Aerodynamics
    Type: NACA-RM-L52D08A
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  • 5
    Publication Date: 2019-07-12
    Description: Tests in the Ames 40- by 80-foot wind tunnel of the static longitudinal characteristics of the Republic RF-84F were made to determine both the origin and a suitable remedy for a pitch up tendency of the airplane encountered at moderate lift coefficients. The results indicated that the pitch-up at moderate lift coefficients was caused by an abrupt change in downwash at the tail which in turn was traceable presumably to flow conditions associated with the inlet-to-wing leading-edge discontinuity.. Attempts to eliminate this pitch-up characteristic with various fairings and stall-control devices. were not wholly successful. The investigation revealed, however, that significant gains in the performance of the airplane could be achieved in the upper lift range.. Three different configurations consisting of a partial-span modified leading edge combined with one or with two-fenees or a leading-edge extension each delayed the onset of separation to higher lift coefficients and provided large improvements in the stability of the airplane in the upper lift range.
    Keywords: Aerodynamics
    Type: NACA-RM-SA52H04
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  • 6
    Publication Date: 2019-08-14
    Description: An investigation at a Mach number of 1.62 was made in the Langley 9-inch supersonic tunnel of a series of missile configurations having tandem lifting surfaces of low aspect ratio and of newly equal span. Some of the variables investigated were interdigitation angle, wing and tail plan form, and longitudinal location of wing with respect to tail. All configurations were tested through an angle-of-attack range from -5 deg to 15 deg at roll angles of 0 deg and 45 deg. Lift, drag, and pitching moment data are presented, together with center-of-pressure locations and tail-lift efficiency factors.
    Keywords: Aerodynamics
    Type: NACA-RM-L51J15
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  • 7
    Publication Date: 2019-07-11
    Description: An approximate method of calculating the deformations of wings of uniform thickness having swept, M or W, Delta, and swept-tip plan forms is presented. The method employs an adjustment to the elementary beam theory to account for the effect of the triangular root portion of a swept wing on the deformation of the outboard section of the wing. To demonstrate the general applicability of the method, the modified elementary theory is applied to the more complex M or W, Delta, and swept-tip plan forms as well as to swept plan forms. For the purpose of calculating angles of attack, it is shown that the unmodified elementary beam theory applied to that part of the wing outboard of the root triangle produces satisfactory results. However, for calculating deflections it is necessary to include the effects of the root-triangle deformation.
    Keywords: Aerodynamics
    Type: NACA-RM-L53A23
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  • 8
    Publication Date: 2019-08-14
    Description: The method for predicting wing- tail interference whereby the trailing vortex system behind lifting wings is replaced by fully rolled-up vortices has been applied to the calculation of tail efficiency parameters, lift characteristics, and center -of-pressure locations for a series of generalized missile configurations. The calculations have been carried out with assumed and experimental vortex locations, and comparisons made with experimental data. The measured spanwise locations of the vortices for the inline case were found to be in good agreement with the asymptotic values computed from the center of gravity of the vorticity using the method of Lagerstrom and Graham. For the interdigitated configurations the measured spanwise locations were in only fair agreement with the asymptotic locations computed for the inline case. The vertical displacement of the vortices with angle of attack for both inline and interdigitated configurations was small. The method utilizing the rolled -up vortex concept was shown to give good results in the prediction of tail efficiency variations with angle of attack for inline configurations. Not as good correlation with experiment was shown for the interdigitated configurations. Complete configuration lift -curve slopes and center -of-pressure locations, obtained using t ail efficiency calculations together with the characteristics of the components obtained from available theoretical methods, showed excellent correlation with experimental results.
    Keywords: Aerodynamics
    Type: NACA-RM-L52H05
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  • 9
    Publication Date: 2019-08-14
    Description: A flight investigation has been made to determine the longitudinal stability and control characteristics of a 60 0 delta-wing-canard missile configuration with an exposed wing-canard area ratio of 16:1. The results presented include the longitudinal stability derivatives, control effectiveness, and drag characteristics for a Mach number range of 0.75 to 1.80 and are compared with the results of a similar configuration having larger 6ontrols. Stability characteristics are also presented from the flights of an interdigitated canard configuration at a Mach number of 2.08 and a wing-body configuration at Mach numbers of 1.25 to 1.45. The stability derivatives varied gradually with Mach number with the exception of the damping-in-pitch derivative. Aerodynamic damping in pitch decreased to a minimum at a Mach number of 1.0 3, then increased to a peak value at a Mach number of 1.26 followed by a gradual decrease at higher Mach numbers. The aerodynamic-center location of the in-line canard configuration shifted rearward 13 percent of the mean aerodynamic chord at transonic speeds. The pitching-moment curve slope was 25 percent greater for the model having no canards than for the in-line configuration. No large effects of interdigitation were noted in the stability derivatives. Pitching effectiveness of the in-line configuration was maintained throughout the Mach number range. A comparison of the stability and control characteristics of two canard configurations having different area controls showed that decreasing the control area 44 percent decreased the pitching effectiveness proportionally, shifted the aerodynamic-center location rearward 9 to 14 percent of the mean aerodynamic chord, and reduced the total hinge moments required for 10 trimmed flight about 50 percent at transonic speeds.
    Keywords: Aerodynamics
    Type: NACA-RM-L52D24a
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  • 10
    Publication Date: 2019-07-11
    Description: The results of free-flight drag tests of 40-millimeter shells conducted by the National Advisory Committee for Aeronautics for the Ballistic Research Laboratories, Ordnance Department, U. S. Army, are presented. A drag reduction at supersonic speeds of approximately 20 percent of the projectile's drag was obtained by combustion in the wake of the projectile in flight.
    Keywords: Aerodynamics
    Type: NACA-RM-SL53D01A
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  • 11
    Publication Date: 2019-07-12
    Description: Models of the Hermes A-3B missile were tested in the Ames supersonic free-flight wind tunnel to determine the static-longitudinal-stability characteristics at a Mach number of 5.0 and a Reynolds number based on body length of 10 million. The results indicated that the model center of pressure was 45.3 percent of the body length aft of the nose and the lift-curve slope based on body frontal area was 0.064 per degree. Estimates indicated that the effect on these characteristics of aeroelastic twisting of the model fins was small but important if a precise location of center of pressure is required. A comparison of the test results with predictions based on available theory showed that the theory was useful only for rough estimates, The drag coefficient at zero lift, based on body frontal area, was found to be 0.155.
    Keywords: Aerodynamics
    Type: NACA-RM-SA52C10
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  • 12
    Publication Date: 2019-07-12
    Description: The aerodynamic characteristics in pitch of an F-94C airplane, with the primary attention given to its drag characteristics, have been evaluated at low speed in the Ames 40- by 80-foot wind tunnel. The increments of drag due to various surface irregularities, ports, and component parts of the production airplane were determined. Wing-wake surveys were taken to determine the section drag coefficients at midsemispan for the smooth and the production wing. Base-pressure and internal drags of the air-induction system were measured at low inlet-velocity ratios. The characteristics of the airplane in the landing configuration are also included.
    Keywords: Aerodynamics
    Type: NACA-RM-SA52D25
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  • 13
    Publication Date: 2019-07-12
    Description: The performance of a 16-stage axial-flow compressor, in which two modifications of unloaded inlet stages were combined with loaded exit stages, has been determined. In the first modification the exit stages were loaded by decreasing the twelfth through fifteenth stage stator angles 3 deg. as compared with the blade angles in the original compressor, and the inlet stages were unloaded by increasing the blade angles the following amounts: guide vanes and first-stage stator, 6 deg; second- and third-stage stators, 4 deg.; and fourth-stage stators, 3 deg. The over-all performance of this configuration was compared with that of the compressor with the original blade angles. The peak efficiency was increased at all speeds below design and the weight flow was higher at speeds below 80 percent of design, the same at 80 percent of design, and lower at speeds abovce 80 percent of design. The maximum reduction in weight flow occurred at design speed. The surge limit line was higher at speeds between 75 and 90 percent of design when presented on a pressure ratio against weight flow basis. The second configuration was the same as the first with the exception that the second-, third-, and fourth-stage stator blade angles were the same as in the compressor with the original blade angles. A comparison of the performance of this configuration with that of the compressor with the original blade angles showed the same general trends of changes in performance as the first configuration. Comparisons were made of compressor configurations to show the effects upon the performance of decreased loading in the inlet stages. Below 75 percent of design speed, decreased loading results in increased weight flow and peak efficiency; above 80 percent of design speed, decreased loading in the inlet stages results in decreased weight flow and small changes in peak efficiencies. Between 75 and 90 percent of design the changes in surge weight flow and pressure ratio were such that the surge limit line was raised with decreased loading in the inlet stages when presented as pressure ratio against weight flow.
    Keywords: Aerodynamics
    Type: NACA-RM-E53C14
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  • 14
    Publication Date: 2019-07-12
    Description: An investigation of the aerodynamic characteristics of an 0.025-scale model of the MX-1712 configuration has been conducted in the Langley 4- by 4-foot supersonic pressure tunnel. The tests were performed at Mach numbers of 1.41 and 2.01 at a Reynolds number of approximately 2.6 x 10(exp 6) based on the wing mean aerodynamic chord The MX-1712 is a proposed swept-wing, jet-powered supersonic bomber aircraft. The wing is of aspect ratio 3.5, taper ratio 0.2, and thickness ratio 5.5 percent (streamwise) and has 47deg sweep of the quarter-chord line. The longitudinal and lateral force characteristics of the model and various combinations of its components, including several nacelle installations, were investigated. The effects of a modified wing, two horizontal tail positions, and a shortened fuselage were also studied. The results obtained from these investigations are presented in this report. The aerodynamic investigation of this model disclosed no unusual stability characteristics or Mach number effects. The choice of nacelle installations appears to be a major decision, one greatly affecting the performance of the airplane, At M = 1.41 and C(sub L) = 0.1, the buried nacelles increased the drag of the basic model by 9 percent, while the best pod nacelles increased the drag of the basic model by 27 percent.
    Keywords: Aerodynamics
    Type: NACA-RM-SL52J17
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  • 15
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    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 24 (1952) 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 16
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 1-2 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird ein Verfahren beschrieben, die wirksame Oberfläche eines Katalysators ohne Behinderung des Gastransportes zu erhöhen durch Aufbringen des katalysierenden Stoffes in Pulverform auf impräginerte Körner ohne Beimischung eines Bindemittels und ohne mechanischen Druck. Die Katalysatoren sind schüttfest. Sechs Beispiele mit vergleichenden Versuchen an großtechnisch wichtigen Prozessen zeigen eine um ein Vielfaches erhöhte Ausbeute.
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  • 17
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Das Aufzeigen der Merkmale im Aufbau von Zerstäubungstrocknern führt zu einer Betrachtung der Abmessungen der Teilchen, aus denen das Trockenpulver besteht. Mikroaufnahmen lassen die verschiedenen Einflüsse auf die Teilchengröße erkennen. Letztere legt ihreseits die Größe der Wärmeund Stoffaustauschzahlen fest. Das Hauptergebnis dieser theoretischen Untersuchungen ist die Trockenzeit. Je nach Teilchenabmessung schwankt sie zwischen Bruchteilen und einer Vielzahl von Sekunden. Auch der Betriebsmittelverbrauch wird untersucht; es wird gezeigt, wie der Wärmeverbrauch erniedrigt werden kann.
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  • 18
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 22-25 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In den bis jetzt in der amerikanischen Literatur veröffentlichten beiden Enthalpie - Diagrammen wird nicht das metrische Maßsystem angewendet oder sie umfassen nicht das ganze Gebiet des Systems Wasser-Schwefelsäure-Schwefeltrioxyd. Außerdem ist die Genauigkeit der Enthalpiewerte schwer zu beurteilen, da die Verfasser die Auswertung der experimentellen Daten nicht erklären. Im folgenden wird nun über die Berechnung und Konstruktion eines Enthalpie-Diagramms im metrischen Maßsystem über das gesamte Gebiet des Systems ausführlich berichtet, und Fehlergrenzen werden angegeben.
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  • 19
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 32-36 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 20
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 36-41 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
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  • 21
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird über die Arbeiten dreier Autoren berichtet, die möglichst einfache Formen der Dispersoidanalyse für technische Zwecke entwickelt haben. Zwei Arbeiten befassen sich mit der Verbesserung oder Vereinfachung bekannter Methoden, die auf der Sedimentation von Dispersoiden in Flüssigkeiten bzw. der Messung der Durchlässigkeit des aufgehäuften Materials beruhen. Die dritte Arbeit benutzt die Dispersion des Lichts in Abhängigkeit von der Teilchengröße, den sog. Mie-Effekt, und verspricht bei Einsatz entsprechender optischer Mittel eine fast augenblickliche Messung, die auch die Bildung oder Veränderung von Dispersionen zu verfolgen gestatten würde.
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  • 22
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 41-42 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 23
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 42-44 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 24
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 45-46 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 25
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 47-49 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 26
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 49-50 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 27
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 58-59 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 28
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 60-81 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird an Hand von Photographien ein Überblick über das Verhalten von mit Gasen oder Flüssigkeiten aufgeströmten, gekörnten Schüttgütern gegeben. Auf Grund der vorliegenden Literatur und eigener Arbeiten werden quantitative Angaben gemacht über die Größe des Druckabfalles in Wirbelschichten, die minimalen und maximalen Geschwindigkeiten, bei denen eine Wirbelschicht noch beständig ist, und über die Schichtausdehnung infolge der Wirbelbewegung des gekörnten Gutes. Weitere Angaben folgen über die Viscosität in Wirbelschichten, den Böschungswinkel sowie den Stoff- und Wärmetransport, den Abrieb des wirbelnden Kornmaterials, die Erosion der Apparatewände sowie über chemische Umsetzungen in Wirbelschichten.
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  • 29
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In der vorliegenden Arbeit werden Aufströmungseigenschaften und hydrodynamische Zustände mit Luft aufgewirbelter Partikelschichten untersucht. Anschliεßend wird eine Versuchsanordnung und Methode für Wärmeübergangs-Messungen in solchen Schichten im Vergleich zu ruhenden Schüttungen behandelt und eine Deutung der Versuchsergebnisse gegeben.
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  • 30
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 92-92 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird die Formulierung des Winkler-Verfahrens in deutschen und amerikanischen Patentschriften erörtert, wobei wesentlich ist, daß die Vergasung in einer bewegten Schicht stattfindet.
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  • 31
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 93-97 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Eine Schicht von losem, feinkörnigem Schüttgut läßt sich in einem Behälter durch eine richtig dosierte Gasströmung in einen beweglichen Zustand versetzen. Die Schicht verhält sich dann ähnlich wie eine Flüssigkeit. Es werden Untersuchungen und Verfahren beschrieben, denen das Prinzip der Wirbelschicht zugrunde liegt.
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  • 32
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 110-114 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 33
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 129-135 
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    Notes: Aus dem bei der Badischen Anilin-& Soda-Fabrik, Ludwigshafen, entwickelten Spiralwindsichter entstand durch die Einführung rotierender Sichtraumwände, einer sich automatisch der Trenngrenze anpassenden Grobgutspülung und nach sorgfältiger konstruktiver Durcharbeitung eine betriebsreife Maschine. Bei dieser Entwicklung wurden neue Erkenntnisse über die Definition der Korngröße und das Ansatzverhalten von Feinstäuben gewonnen. Die vermutliche Weiterentwicklung wird abschließend skizziert.
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    Notes: Den zahlreichen Vorschlägen zur wirtschaftlichen Bewertung von Wärmeübertragern wird die Anregung entgegengestellt, die Kosten für den Gesamtaufwand an Rohrlänge zur wichtigsten Grundlage einer wirtschaftlichen Bewertung verschiedener Gestaltungen zu machen. Die Vergleiche werden für Längsstrom in Rohren und für Querstrom durch Rohrbündel mit Einschluß berippter Rohre in einheitlicher und systematischer Weise durchgeführt. Besonders bei niedrigen Re-Zahlen erweisen sich Querstrom-Anordnungen mit engen Rohrabständen als wirtschaftlich überlegen.
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 156-157 
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    Notes: Um die Betriebssicherheit und Lebensdauer von Vakuumpumpen zu erhöhen, kann ein Staubfilter vorgeschaltet werden. Hierfür lassen sich ein U-Rohrfilter bzw. ein Öl-Umlauffilter, die mit trockenen bzw. ölbenetzten Raschig-Ringen gefüllt sind, verwenden.
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 160-163 
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 165-165 
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 158-159 
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    Notes: Bei der Auswertung photographisch aufgenommener Spektren sowie der intensitätsmäßigen Auswertung von Röntgenaufnahmen, speziell von Faseraufnahmen und diffusen Streukurven, muß man die vom Registrierphotometer gelieferte Kurve auf Intensität bzw. Schwärzung umwerten. Es wird ein aus einfachen Mitteln herstellbarer Apparat angegeben, der dies mechanisch ausführt und sich gut bewährt hat.
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    Notes: Berichtet wird über wesentliche Fortschritte der Fischer-Tropsch-Synthese mit festangeordnetem Katalysator. Die Entwicklung hochaktiver Eisen-Katalysatoren und Aufklärung wichtiger Fragen der Reaktionskinetik und des Wärmetransportes in den Reaktoren ermöglichte erhebliche Erhöhung der Ausbeute und Qualität der Produkte und technische Verbesserung der Synthese-Anlagen, so daß die Wirtschaftlichkeit des Fischer-Tropsch-Prozesses unter sehr verschiedenartigen Bedingungen gegeben ist. Erstmalig werden zusammenfassende Mitteilungen über die Qualität der aus diesen Produkten von der Ruhrchemie großtechnisch hergestellten synthetischen Schmieröle gemacht.
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    Notes: Die Schwingungstechnik hat in den letzten Jahren auch in der chemischen Industrie ständig an Bedeutung gewonnen. Einmal ergaben sich in vorhandenen Anlagen bei Erweiterungen Schwierigkeiten, so daß man auf neue Erkenntnisse der Schwingungstechnik angewiesen war, zum anderen aber wollte man auch bei Neuplanungen die Vorteile schwingungstechnischer Gründung von Maschinen von vornherein ausnutzen. Im folgenden wird eine Übersicht gegeben über die sich bietenden Probleme und deren praktische Lösungen, wie sie mit Erfolg bereits verwirklicht sind oder z. Zt. verwirklicht werden.
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 272-277 
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    Notes: Im folgenden werden die Grundzüge der Physik der Festkörper, soweit sie zum Verständnis der Pulverdispersoide notwendig sind, behandelt. Der Einfluß von mechanischem Zerkleinerungsgrad, Eigengewicht, Kristallstruktur und -oberfläche auf das Verhalten von Pulvern wird dargelegt.
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 277-283 
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    Notes: Am Beispiel des Penicillin wird die großtechnische Herstellung der Antibiotika behandelt. Besonderheiten, die sich für die Reinigung von Streptomycin und Aureomycin aus ihren chemischen Eigenschaften ergeben, werden berücksichtigt.
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 284-288 
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    Notes: Zur Untersuchung von Sedimentations-, Elektrophorese- und Diffusionsvorgängen wurde ein lichtstarkes Meßverfahren nach der Interferenzmethode entwickelt, das den Vorteil der hohen Lichtstärke einer Jaminschen Anordnung des Planparallelplatten - Interferometers gegenüber dem Doppelspalt-Interferometer voll ausnutzt, indem als optisches Zusatzglied zwei gewinkelte gleichdicke Planparallelplatten angefügt werden. Ein Gerät zur Messung der Diffusionskonstanten wird beschrieben.
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    Notes: In der Verfahrenstechnik spielen rheologische Einflüsse eine bedeutende Rolle. An Beispielen aus der Reyon- und Zellwollindustrie wird gezeigt, daß u. a. die Spinnlösung in den verschiedenen verfahrenstechnischen Stufen ein unterschiedliches Verhalten aufweist. Durch eine rheologische Betriebskontrolle können der Fabrikationsprozeß überwacht und Aussagen über die Qualität des Ausgangsproduktes und der Fertigprodukte gemacht werden.
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 339-347 
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    Notes: An Hand einiger Beispiele der Praxis wird Stellung genommen zur Frage, welche Faktoren bei bestimmten, mit etwa atmosphärischen Drucken betriebenen Gaserzeugertypen die Zusammensetzung der Vergasungsgase beeinflussen.
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    Notes: Auf Grund neuerer experimenteller Ergebnisse englischer und russischer Autoren werden unter Heranziehung eigener reaktionskinetischer Untersuchungen die vermutlichen Elementarreaktionen der aus den Experimenten folgenden drei Reaktionsstufen der Kohleverbrennung Cfest + ½ O2 = CO; CO + ½ O2 = CO2; CO2 + Cfest = 2 CO aufgestellt. Es wird versucht, aus dem Elementarablauf die experimentellen Befunde abzuleiten und verständlich zu machen. Die Vorgänge bei der Vergasung der Kohle sowie Fragen der Energieverteilung zwischen Festkörper und Gas werden diskutiert.
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    Notes: Es wird ein Ofen beschrieben, der zum Ausglühen von Kupferoxyd für die Stickstoff-Bestimmung nach Dumas gebraucht wird, sich aber auch zum Ausglühen von körnigen Substanzen in beliebigem Gasstrom eignet.
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    Notes: An Hand einer umfangreichen Tabelle wird gezeigt, daß sich das Guldbergsche Verhältnis ϑ = Ts/Tk für organische Verbindungen additiv aus Atom- und Gruppenwerten zusammensetzen läßt. Damit wird es möglich, die absolute kritische Temperatur Tk eines organischen Stoffes abzuschätzen, wenn dessen Siedetemperatur Ts bekannt ist.
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    Notes: Es wird ein lösbarer Hochdruckverschluß beschrieben, bei dem die Abdichtung durch einen Kupferring bewirkt wird. Sodann wird der Kraftfluß durch den Kupferring ermittelt sowie die durch die Abdichtung bewirkte Biegespannung im Behälter.
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 401-402 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird gezeigt, daß die im Betriebe von Spinnbadeindampfern fallweise auftretenden, schwer entfernbaren Verkrustungen der Heizrohre im wesentlichen durch die Ausscheidung von Glauberit verursacht werden. Verschiedene Einflüsse, die die Bildung des Doppelsalzes begünstigen, werden aufgeklärt.
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  • 81
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 403-404 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Durch Anwendung eines temperaturkompensierten Aräometers nach Neubauer wird eine sehr genaue und schnelle Gehaltsbestimmung rauchender Schwefelsäure möglich. Weitere Anwendungen des neuen Gerätes werden kurz erörtert.
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  • 82
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    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 24 (1952), S. 405-411 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden behandelt die Abhängigkeit der Kolonnenbelastung vom Differenzdruck für verschiedene Füllkörper und verschiedene Einsatzprodukte, die Belastung bei vermindertem Druck, die Wirksamkeit verschiedener Füllkörper in Abhängigkeit von der Belastung und der günstigste Belastungsbereich.
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  • 83
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    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 24 (1952), S. 411-413 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird über die Entwicklung im Bau von Hochdruckgefäßen, Verschlußvorrichtungen, Armaturen, Pumpen und Verdichtern sowie Meßgeräten berichtet.
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  • 84
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 393-400 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An einer Universal-Versuchseinrichtung gewonnene neue Versuchsergebnisse werden zusammenfassend mitgeteilt. Sie betreffen das Kondensieren, Verdampfen, Erwärmen und Kühlen. Für kondensierenden Wasserdampt gestatten die Messungen einen Vergleich zwischen Theorie und Wirklichkeit einerseits und zwischen Film- sowie Tropfenkondensation andererseits. Enthält der Dampf Luft, dann ist für die Vorausberechung eine zweckentsprechende Deutung des hydraulischen Durchmessers unerläßlich. Für diese wird ein Beitrag geliefert. Die am senkrechten Versuchsrohr gemessenen Wandtemperaturen gestatten, die Wärmeübergangszahl zwischen Rohrwand und im Rohr wahlweise bei auf- und abwärts strömendem Wasser zu messen. Infolge Eigenkonvektion ergeben sich bei kleinen Geschwindigkeiten in beiden Fällen unerwartet hohe Unterschiede gegenüber den bekannten Gleichungen. Überraschend sind aber die jetzt erstmalig bekanntgegebenen Beobachtungen über den Einfluß des Schämens auf den Wärmeübergang im senkrechten Verdampferrohr. Das Schäumen erhöht den Wärmeübergang von Lösungen im selben Maß wie die Tropfenbildung beim Kondensieren von Wasserdampf.
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  • 85
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 414-415 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 86
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 415-419 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 8 Ill.
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  • 87
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 420-420 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 88
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 420-421 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 89
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    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 24 (1952), S. 421-421 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 90
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 422-424 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 91
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 425-426 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 92
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 427-427 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 93
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 428-429 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 94
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 429-436 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 95
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    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 24 (1952) 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 96
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 437-443 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Nach Erörterung der Grundlagen der Regeltechnik werden die wichtigsten im chemischen Betrieb verwendeten Regeleinrichtungen an Hand einfacher Beispiele in ihrer grundsätzlichen Arbeitsweise besprochen.
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  • 97
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 444-446 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Der Wärmeübergang durch die wandnahe Zone ist in aufgewirbelten Partikelschichten im Vergleich zu gasdurchströmten Leerrohren sehr groß. Es wird eine Deutung des Mechanismus des Wärmetransportes angegeben. Der Wärmedurchgang durch die gesamte Schicht und der Anteil der effektiven Wärmeleitfähigkeit im Schichtinnern werden diskutiert. Die Einflußgrößen für den Wärmeübergang  -  Gasgeschwindigkeit, Partikelgröße, physikalische Eigenschaften von Partikeln und Gas, Schüttdichte und Schichtabmessungen  -  werden durch eine empirische Gleichung wiedergegeben. Auf den Einfluß der Gleichmäßigkeit der Schichtaufwirbelung wird eingegangen.
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  • 98
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 447-451 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Der Druckzuwachs in einem geschlossenen Flüssigkeitsbehälter bei Temperatursteigerung folgt solange der Dampfdruckkurve, bis die sich thermisch ausdehnende Flüssigkeit den Behälter vollständig füllt. Bei weiterer Temperaturerhöhung steigt der Druck erheblich steiler. Sein Endwert ist vom Füllungsgrad bei der Anfangstemperatur und von der Nachgiebigkeit des Behälters abhängig. Der Füllungsgrad kann bei Behältern für Propan und Butan, die ohne Gewichtskontrolle gefüllt werden, 100% erreichen. Aus sicherheitstechnischen Gründen ist die Kenntnis der unter diesen Umständen auftretenden Höchstdrucke von Bedeutung.
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  • 99
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Durch Benutzung einer hahnlosen Bürette wird die Ablesung des Gasvolumens sehr erleichtert. Die beschriebenen Änderungen werden stets vorteilhaft sein, wenn ein Gas volumetrisch bestimmt werden soll, das mit einer stark gefärbten oder einer mit Hahnfett reagierenden bzw. Niederschlag abscheidenden Flüssigkeit in Berührung steht.
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  • 100
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    Chemie Ingenieur Technik - CIT 24 (1952), S. 466-469 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
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