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  • Polymer and Materials Science  (48)
  • Ulcer surgery  (2)
  • 61.46.+w  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Langenbeck's archives of surgery 357 (1982), S. 93-103 
    ISSN: 1435-2451
    Schlagwort(e): Peptic ulcer ; Perforated ulcer ; Ulcer surgery ; Simple closure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung In einer retrospektiven Untersuchung an 243 Patienten wird versucht, prognostische Kriterien der einfachen Geschwürsübernähung zu erstellen. Postoperative Komplikationen und Letalität korrelieren eng mit dem Lebensalter, der Perforationszeit und der Ulcusgröße, nicht aber mit der Geschwürslokalisation und Anamnesedauer. 1–15 Jahre postoperativ waren 39,4 % der Patienten beschwerdefrei, 34,8 % standen in konservativer Behandlung. 25,8 % waren zwischenzeitlich am Magen reoperiert, davon die Hälfte wegen einer Ulcuskomplikation. Keinen Einfluß auf die Rezidiverwartung haben Lebensalter, Perforationszeit, Klinikverweildauer, Arbeitsunfähigkeit, Alkohol und Nicotinabusus. Ausschlaggebend ist die präoperative Anamnesedauer. Bei fehlender bis zu halbjähriger Ulcusanamnese bleiben bis zu 70 % nach Geschwürsübernähung beschwerdefrei, die Reoperationsfrequenz liegt bei 11 %. Bei langjähriger Vorgeschichte sind Rezidivquoten von bis zu 70 % zu erwarten. Die Bedeutung der Anamnesedauer für die chirurgische Verfahrenswahl bei Geschwürsperforation wird unterstrichen.
    Notizen: Summary A retrospective study was made based on 243 patients with simple closure of a perforated peptic ulcer in order to analyse factors influencing the results. Complications and mortality showed a good correlation with age, time between onset of symptoms and operation and size of the perforation, but no correlation with ulcer localization and history. Between 1 and 15 years after the operation, 39,4 % of the patients were asymptomatic, 34,8 % under conservative treatment, whilst 25,8 % had to be reoperated on in the meantime. There was no correlation between recurrence and the age of the patients, the time between onset of symptoms and operation, the duration of stay in hospital, inability to work, alcohol and nicotine abuse. Ulcer history was the only factor influencing the late result significantly. Only 11 % of patients with a short ulcer history (no longer than 6 months) had to be reoperated on whereas in those with a long ulcer history a recurrence rate of 70 % can be expected. The importance of ulcer history for the choice of surgical treatment is emphasized.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Langenbeck's archives of surgery 355 (1981), S. 545-545 
    ISSN: 1435-2451
    Schlagwort(e): Peptic ulcer ; Perforated ulcer ; Ulcer surgery ; Ulcus ; perforiertes Ulcus ; Ulcuschirurgie
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung In einer retrospektiven Analyse von 243 Patienten mit übernähtem, perforiertem Gastroduodenal-Ulcus wurde die Leistungsfähigkeit der Obernährung untersucht. Bei einem Durchschnittsalter der Patienten von 47,5 Jahren für die Männer und 60 Jahren für die Frauen betrug die mittlere Anamnesedauer 7,6 Monate, die mittlere Perforationszeit 12 h und die Gesamtletalität 14,6%. 1-15 Jahre postoperativ waren 40 asymptomatisch, 34% in konservativer Behandlung und 26% wegen Ulcus reoperiert. Bei kurzer Anamnese (1/2 Jahr) war nur in 11% eine Reoperation nötig.
    Notizen: Summary A retrospective study was made based on 243 patients with simple closure of a perforated peptic ulcer. The mean age was 47.5 years in men and 60 years in women, the mean ulcer history 7.6 months, the mean time between onset of symptoms and clinical admission 12 h, and overall mortality was 14.6%, with good correlation to the latter. From 1 to 15 years following the operation, 40% of the patients were asymptomatic, 34% under conservative treatment, and 26% had to be reoperated on in the meantime. Only 11% of the patients with a short ulcer history (1/2 year) had to be reoperated on.
    Materialart: Digitale Medien
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  • 3
    ISSN: 1434-6036
    Schlagwort(e): 79.20.Kz ; 61.46.+w ; 61.16.Bg
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The crystal and electronic structure of solidC 76 has been studied using transmission electron microscopy and electron energy-loss spectroscopy in transmission. C76 forms a close packed structure with an average facecentred cubic symmetry. From valence band and core electron excitations information on the dielectric function and the unoccupied density of states has been obtained.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. 555-568 
    ISSN: 0449-2978
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A simple differential, isothermal calorimeter has been built to study the thermodynamics of interactions associated with a variety of polymer solution processes. The calorimeter is readily operated at temperatures ranging from ambient to about 200°C., temperature adjustments are rapid, and the apparatus is rugged enough to permit application to commercial process studies. Though less sensitive than microcalorimeters, it represents an attractive combination of satisfactory accuracy, speed, and flexibility of operation. The operation of the calorimeter is demonstrated by measurements of the heat of solution of sodium chloride in water and the heats of solution of various polyolefins in Tetralin and α-chloronaphthalene. The latter tend to confirm the presence of polymer aggregates in chloronaphthalene solutions below the thermodynamic melting temperature of the polymer.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 1043-1053 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Time dependence in the melt indexing of polyolefins stabilized against thermally induced changes is well known, the prevalent effect being an increase in melt index toward a steady-state value. The melt index of polyethylenes compounded with carbon black has been found to decrease, in some cases radically, although oxygen uptake data show no evidence of thermal instability. The melt index-time plot can be restored to its normal shape by adding excess quantities of a standard thioether antioxidant. Data are rationalized by assuming that polyethylene adsorbs on the available pigment surface, forming a crosslink network. The thioether antioxidant, however, may adsorb preferentially, thereby restoring the normal response of the polymer to forces resulting in its capillary extrusion. The results emphasize the contribution of chain orientation effects to the time dependence of melt index.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 539-543 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 2663-2673 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Suzorite mica has been surface modified by microwave plasma treatment in ethylene gas. The surface-treated mica was used as a filler in polyethylene, polystyrene, and a mixture of these two polymers. Significant changes in rheological behavior ensue. These indicate that adhesion between polyethylene and irradiated mica is superior to that of interfaces using unirradiated mica. In contrast, ethylene irradiation reduces the ability of filled polystyrene compounds to store elastic energy in melt flow, an effect consistent with impaired adhesion at interfaces involving these components. An intermediate situation exists in the case of the two-polymer blend. The tensile properties of these systems also reflect surface treatment, reinforcement occurring in polyethylene-containing compounds, while the tensile properties of polystyrene composites deteriorate. Plasma-induced surface modifications of fillers to produce desired property changes in specified polymer matrixes are implied by the present work, but a fuller understanding of the chemistry of surface modification reactions is needed to substantiate these implications.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1961-1968 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Films of poly(methyl methacrylate) (PMMA), polystyrene, and a styrene/acrylic terpolymer have been cast from solutions of varying thermodynamic quality and the film properties studied by inverse gas chromatography and by critical surface tension measurements. Surface properties of the non-polar polystyrene were independent of solvent medium, but significant variations in these properties were observed in the case of PMMA and the terpolymer. Solvent balance also appeared to affect the bulk properties of the latter films, as judged by the penetration rates of interacting liquids. The observations indicate the feasibility of controlling film properties of the solid by the appropriate selection of solution media; a time-dependent variation in solid properties is to be expected, however, as the film structure attains an equilibrium state.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 731-740 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The chain entanglement states in high density, linear low density, and low density polyethylenes (HDPE, LLDPE, and LDPE) have been modified by recovering the polymers from solutions in trichlorobenzene (TCB) and p-xylene. In the thermodynamically good solvent, TCB, the entanglement density is assumed to be sharply reduced, a condition which is carried over to the corresponding solids. These display transient, but large increments in tensile moduli, slight changes in stress at rupture, and decreases in dynamic mechanical parameters and in elongation at rupture. Scanning calorimetry also shows these solids to have reduced crystallinity. Much smaller property modifications are noted in corresponding samples recovered from p-xylene. This liquid is a poorer solvent, particularly for HDPE and LLDPE. The results indicate that property modifications due to deliberate changes in the entanglement states of the polymers are a general phenomenon in the polyethylenes, and the magnitude of property changes depends on parameters of the molecular weight distribution. Chain branching does not seem to be a leading factor in the sensitivity of properties to modifications in the entanglement states. The property modifications produced by the present solution treatments are viewed as guides to the magnitude and duration of shear refining effects to be expected in HDPE, LLDPE, and LDPE polymers.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 2493-2501 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Rheological and mechanical properties of polyvinyl chloride (PVC) compounds vary with the polymer entanglement state at the time of testing. Controlled shearing episodes and thermal histories applied to the compounds produce major property variations. These then relax toward steady-state values at rates which are consistent with diffusion-controlled processes, presumably connected with the development of steady-states in entanglement couplings. Activation energies of 4-7 kcal/mol apply to the proposed re-entanglement processes. Rates of property variation can be altered by the addition of fillers to the compounds, the interactions between polymer and filler being an important factor in this regard. CaCO3 samples with strong affinity for the PVC retard the rate of property variations (i.e., the filler tends to stabilize non-steady-state entanglement couplings). Fillers, surface treated so as not to interact strongly with the polymer, produce lesser effects on relaxation rates. The data indicate the feasibility of controlling both the sensitivity of polymer properties to processing variables, and the rates of property change associated with the attainment of steady-state polymer entanglement morphologies.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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