Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Chemical Engineering  (31)
  • Magenkrebs  (2)
  • Peptic ulcer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Prognostische Kriterien der Ulcusübernähung (1982)
    Springer
    Langenbeck's archives of surgery 357 (1982), S. 93-103 
    Details
    ISSN: 1435-2451
    Keywords: Peptic ulcer ; Perforated ulcer ; Ulcer surgery ; Simple closure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: 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.
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01237455
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    3. Einführung (1982)
    Springer
    Langenbeck's archives of surgery 358 (1982), S. 53-55 
    Details
    ISSN: 1435-2451
    Keywords: Gastric cancer ; Evaluation ; Technique ; Magenkrebs ; Bilanz nach 100 Jahren ; Taktik ; Technik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Theodor Billroth konzipierte vor 100 Jahren die Technik der Magencarcinom-Resektion und zeitlos gültig die taktischen Prinzipien der radikalen kurativen Krebsoperation am Magen.
    Notes: Summary A hundred years ago Theodor Billroth devised the technique of gastric cancer resection and the perpetually valid tactical principles of radical curative gastric cancer surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271755
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    168. Prognostische Kriterien der UlcusÜbernÄhung (1981)
    Springer
    Langenbeck's archives of surgery 355 (1981), S. 545-545 
    Details
    ISSN: 1435-2451
    Keywords: Peptic ulcer ; Perforated ulcer ; Ulcer surgery ; Ulcus ; perforiertes Ulcus ; Ulcuschirurgie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: 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.
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01286998
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Polyethylene flow data from melt viscometer and commercial extruder measurements (1961)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 1 (1961), S. 86-92 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: For broad ranges of operating conditions and a wide variety of high pressure polyethylenes, the flow data obtained from a high shear viscometer and a commercial extruder are identical. Discrepancies between flow data can result from non steady state viscosities in the high shear viscometer, or from cooled screw extruder operation. In the broad regions in which the flow data concur, the readily obtained viscometer data are suitable for predictions of extruder performance. The principle is illustrated by the good correlation of a viscometer flow curve parameter and the screw power consumption in the extruder. Principles outlined for flow data identity and extruder performance prediction are believed to be general, but the quantitative limits defined are specific to the extrusion devices involved.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760010209
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Introductory remarks (1977)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 17 (1977), S. 433-433 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760170702
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Adhesion at polypropylene-cellophane interfaces (1977)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 17 (1977), S. 456-461 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The shear strength of bonds between isotactic polypropylene and cellophane, formed under standard conditions, has beer studied as a function of cooling rates, following bond formation, and after ageing at temperatures up to 90°C. Rapid cooling produced cohesively failing bonds with shear strengths above 20 kg/em2. Weak, adhesively failing joints were produced under slow-cooling conditions. Strong bonds deteriorated when joints were aged at temperatures above 50°C, but further improvement in bond strength was observed upon ageing at lower temperatures. Experimental observations were consistent with the development of smectic structure in the polypropylene upon rapid cooling; a tendency for transcrystallization in slow-cooled joints was offset by the presence of weak boundary layers in the interface. Ageing produced further development of weak boundary layers and a transition from smectic to monoclinic crystallization in polypropylene. At higher ageing temperatures, the former effect seemed dominant; at lower temperatures, the structural change was assumed responsible for the observed improvement in bond strength.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760170707
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Dependence of mechanical properties in polyolefin blends on shear and thermal history (1981)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 21 (1981), S. 433-438 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Variously dispersed two-component blends of linear polyethylene and a thermoplastic rubber were subjected to different thermal histories after compression molding and their properties were evaluated. It has been shown that ultimate properties of the blends are not defined by the composition, but vary greatly with degree of dispersion and thermal history. Stronger materials failing in a ductile manner were produced under shock cool conditions and in, finely-dispersed blends. Brittle failures and weaker materials were favored by annealing procedures and in blends subjected to brief and/or lowshear dispersion procedures. Time and temperature dependent changes in properties of blends prepared under standard conditions have been observed and activation energies for the aging process calculated. Data interpretation was based on a hypothesis of domain morphology in the blends, and on the existence of “tie molecules” which help to determine the cohesive strength of domain boundaries.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760210710
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Value recovery from polymer wastes by pyrolysis (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 721-727 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Pyrolysis of polymer wastes appears to be a suitable means of dealing with an increasingly important environmental problem. To provide background on the pyrolytic behavior of wastes, model mixtures of polyethylene and polystyrene have been pyrolyzed in various gas phases including nitrogen and carbon monoxide, at atmospheric and at reduced pressures and at temperatures from about 300-900°C. When the pyrolyzing temperature is attained by gradual heating, and when pyrolysis occurs at pressures in excess of about 200 torr, the process occurs as if each component were present alone - that is, no evidence for component interaction was noted. In these cases, the known mechanisms for pyrolysis of the pure polymers can be applied to the behavior of mixtures. Complicating effects due to interactions between the starting polymers, or among the pyrolysis products, were observed in low pressure pyrolysis (≲20 torr); further, it was shown that the balance of pyrolysis products depends on rates of attaining the pyrolyzing temperature, more rapid rates favoring the production of carbon-rich solid residues of possible use as carbon blacks. More detailed understanding of pyrolytic processes in polymer mixtures is needed to permit selection of conditions producing the optimum balance of useful products.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760180907
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Effects of dispersion on flow and mechanical properties of polymer blends (1979)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 19 (1979), S. 900-906 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Blends of linear polyethylene and ethylene-propylenediene elastomer, representing the entire composition range, were prepared under various conditions of shear intensity. It was found that both viscoelastic flow parameters and mechanical properties at large deformation respond strongly to variations in shear history of material preparation. Mechanical degradation of the polymers not being detected, it is postulated that property variations are due to morphological effects related to domain sizes of the two components and to the ease of molecular diffusion across domain boundaries. Thus, mechanical properties develop over finite times of mixing, consistent with the attainment of steady states in domain sizes. Maximum sensitivity of mechanical properties to mixing variables is found for 50/50 blends of the polymers, which have maximum interdomain contact areas. It appears feasible to develop desired balances of flow and mechanical properties in such polyblends through the close control of component dispersion processes.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760191304
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Aspects of dispersion and flow in thermoplastic-elastomer blends (1983)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 23 (1983), S. 129-134 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polypropylene, polystyrene, EP (ethylene/propylene) rubber, and bromobutyl rubber were blended under standardized conditions and the sizes of minor phase domains determined by Quantimet analysis. Dispersion effectiveness was found to depend on the melt viscosities of components under mixing conditions and on their “compatibilty” as inferred here from surface-tension data. Dispersion was optimized when components wet readily at contact surfaces and when melt viscosities were similar. Shear heating during dispersion appeared to offer an empirical index of component compatibilty. Apparent melt viscosities of the blends further reflected the component compatibility factor.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760230305
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...