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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 30 (1965), S. 1822-1832 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 70 (1966), S. 1126-1136 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 2991-2997 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly-3-methyl-1-butene has been synthesized by Et2AlCl/tBuCl initiator at -130°C. A cast film of this material gave three well defined crystalline phases, α, β, and γ, characterized by infrared spectroscopy. The γ polymorph could not be obtained independently of the other two. Synthesis and/or manipulative procedures that would consistently give only one of the polymorphs are still unavailable. Evidently, the three crystalline phases have very similar lattice energies, and the subtle factors that determine the ultimate nature of the crystal lattice are not yet understood.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 77 (1964), S. 26-32 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Kationisch hergestelltes, kristallines Poly-3-methylbuten-1 wurde untersucht. RÖNTGENspektren und Differentialthermoanalyse lassen auf das mögliche Vorhandensein dreier kristalliner Polymermodifikationen schließen. Die Infrarotspektren kristalliner und amorpher Proben wurden untersucht.
    Notes: Crystalline, cationically obtained poly(3-methylbutene-1) has been investigated. X-ray and differential thermal analysis indicates the possible existence of three crystalline polymer modifications. The infrared spectra of crystalline and amorphous samples have been investigated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 79 (1964), S. 109-121 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die kationische Polymerisation von 3,3-Dimethylbuten-1(t-Butyläthylen) wurde untersucht. Die Polymerisationen wurden mit AlCl3 als Katalysator in Äthylchloridlösung im Temperaturbereich -31 bis -130°C durchgeführt. Trimere (viskose Öle oder weiche Gele) wurden zwischen -31 und -100°C erhalten. Zusammensetzung und Struktur dieser Produkte sind kompliziert und blieben unaufgeklärt. Ein festes Polymers wurde bei -130°C erhalten. Dieses Material, dessen Polymerisationsgrad ∼ 68 beträgt, ist ein weißes, amorphes Pulver und schmilzt bei 55-66°C. Es ist in den meisten gebräuchlichen Lösungsmitteln löslich. Sorgfältige NMR- und IR-spektroskopische Untersuchungen deuten auf folgende Struktureinheit dieses Polymeren:
    Notes: The cationic polymerization of 3,3-dimethyl-1-butene (t-butyl ethylene) has been investigated. Polymerizations were carried out with AlCl3 catalyst in ethyl chloride solvent in the temperature range -31 to -130°C. Trimers (viscous oils or soft gels) were obtained between -31 and -100°C. The composition and structure of these materials is complicated and remains obscure. Solid polymer was obtained only at -130°C. This material, whose degree of polymerization is ∼ 68, is a white amorphous powder and it melts between 55 and 66°C. It is soluble in most common solvents.Careful NMR and IR spectroscopic studies indicate that the repeat structure of this polymer is:
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 3 (1965), S. 729-734 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 5029-5038 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The cationic polymerization of vinylcyclohexane was investigated with the use of AlCl3 catalyst at temperatures ranging from -144 to +7°C. The structure of the polymer was elucidated by NMR and infrared spectroscopy. These studies indicate that cationically synthesized polyvinylcyclohexane contains predominantly repeat units of the type: which suggests hydride shift isomerization polymerization.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Publication Date: 2011-08-24
    Description: We measured central venous pressure (CVP); plasma volume (PV); urine volume rate (UVR); renal excretion of sodium (UNa); and renal clearances of creatinine, sodium, and osmolality before and after acute volume infusion to test the hypothesis that exposure to microgravity causes resetting of the CVP operating point. Six rhesus monkeys underwent two experimental conditions in a crossover counterbalance design: 1) continuous exposure to 10 degrees head-down tilt (HDT) and 2) a control, defined as 16 h/day of 80 degrees head-up tilt and 8 h prone. After 48 h of exposure to either test condition, a 120-min course of continuous infusion of isotonic saline (0.4 ml. kg(-1). min(-1) iv) was administered. Baseline CVP was lower (P = 0.011) in HDT (2.3 +/- 0.3 mmHg) compared with the control (4.5 +/- 1.4 mmHg) condition. After 2 h of saline infusion, CVP was elevated (P = 0.002) to a similar magnitude (P = 0.485) in HDT (DeltaCVP = 2.7 +/- 0.8 mmHg) and control (DeltaCVP = 2.3 +/- 0.8 mmHg) conditions and returned to preinfusion levels 18 h postinfusion in both treatments. PV followed the same pattern as CVP. The response relationships between CVP and UVR and between CVP and UNa shifted to the left with HDT. The restoration of CVP and PV to lower preinfusion levels after volume loading in HDT compared with control supports the notion that lower CVP during HDT may reflect a new operating point about which vascular volume is regulated. These results may explain the ineffective fluid intake procedures currently employed to treat patients and astronauts.
    Keywords: Aerospace Medicine
    Type: American journal of physiology. Regulatory, integrative and comparative physiology (ISSN 0363-6119); Volume 281; 6; R2021-8
    Format: text
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  • 9
    Publication Date: 2011-08-24
    Description: In the early phase of the Space Shuttle program, NASA flight surgeons implemented a fluid-loading countermeasure in which astronauts were instructed to ingest eight 1-g salt tablets with 960 ml of water approximately 2 hours prior to reentry from space. This fluid loading regimen was intended to enhance orthostatic tolerance by replacing circulating plasma volume reduced during the space mission. Unfortunately, fluid loading failed to replace plasma volume in groundbased experiments and has proven minimally effective as a countermeasure against post-spaceflight orthostatic intolerance. In addition to the reduction of plasma volume, central venous pressure (CVP) is reduced during exposure to actual and groundbased analogs of microgravity. In the present study, we hypothesized that the reduction in CVP due to exposure to microgravity represents a resetting of the CVP operating point to a lower threshold. A lower CVP 'setpoint' might explain the failure of fluid loading to restore plasma volume. In order to test this hypothesis, we conducted an investigation in which we administered an acute volume load (stimulus) and measured responses in CVP, plasma volume and renal functions. If our hypothesis is true, we would expect the elevation in CVP induced by saline infusion to return to its pre-infusion levels in both HDT and upright control conditions despite lower vascular volume during HDT. In contrast to previous experiments, our approach is novel in that it provides information on alterations in CVP and vascular volume during HDT that are necessary for interpretation of the proposed CVP operating point resetting hypothesis.
    Keywords: Aerospace Medicine
    Type: Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology (ISSN 1077-9248); Volume 8; 1; P51-2
    Format: text
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  • 10
    Publication Date: 2019-06-27
    Description: Digital computer program computes and analyzes supersonic flow field in axisymmetric rocket nozzle for specified gas properties, nozzle geometry, and input or starting line. Method of characteristics is used for solution of set of hyperbolic partial differential equations.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: MFS-14292
    Format: application/pdf
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