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  • 1
    Electronic Resource
    Electronic Resource
    Zeitdiskrete Berechnung des Läuferflusses von Asynchronmotoren unter Berücksichtigung veränderlicher Motorwiderstände (1990)
    Springer
    Electrical engineering 74 (1990), S. 79-87 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents Mostly high dynamic control of induction motors is based on rotor flux models. The flux calculation by processors should refer to a time discrete form of equations. Respecting the discrete behaviour of the inverter, the sampling frequency is given by the switching frequency of the inverter. Especially in the case of high-rating drives the lower switching frequency allows extended calculations to correct all coefficients depending on resistances.
    Notes: Übersicht Bei den meisten hochdynamischen Regelverfahren für Asynchronmotoren liefern Flußmodelle Augenblickswerte der Läuferflußverkettung. Sollen die dazu erforderlichen Rechnungen von einem Digitalrechner durchgeführt werden, so sollten die Gleichungen in eine zeitdiskrete Form gebracht werden. Berücksichtigt man dabei die schrittweise Arbeitsweise des Umrichters, so kann die Rechenschrittweite an der Schaltfrequenz der Umrichterventile orientiert werden. Insbesondere bei Antrieben größerer Leistung und niedriger Schaltfrequenz können umfangreiche Berechnungen zur Nachführung aller widerstandsabhängigen Rechenkoeffizienten on-line ausgeführt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573234
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  • 2
    Electronic Resource
    Electronic Resource
    Surfactant protein A in the course of respiratory distress syndrome (1992)
    Springer
    European journal of pediatrics 151 (1992), S. 596-600 
    Details
    ISSN: 1432-1076
    Keywords: Respiratory distress syndrome ; Surfactant protein A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Surfactant-associated protein (SP-A) was measured in tracheal aspirates of ventilated infants with (n=51) and without (n=21) respiratory distress syndrome (RDS). SP-A concentrations in samples collected after birth were significantly lower in RDS than in infants ventilated for other reasons than RDS (median 0.03 vs. 1.60 μg/ml). As a biochemical test to diagnose RDS early after birth, the sensitivity of measuring SP-A in tracheal aspirates was 87% and specificity 81%. SP-A content in tracheal aspirates of infants with RDS was monitored during the first 7 days of life. A significant (P〈0.001) increase within the first 4 days was found in those infants who survived, whereas no such change was found in those infants who died.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01957730
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  • 3
    Electronic Resource
    Electronic Resource
    Increased cerebral blood flow velocities in newborn infants of smoking mothers (1993)
    Springer
    European journal of pediatrics 152 (1993), S. 232-235 
    Details
    ISSN: 1432-1076
    Keywords: Cerebral arteries ; Blood flow velocity ; Newborn infant ; Tobacco smoke ; Pregnancy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cerebral blood flow velocities (CBFV) were measured by the pulsed Doppler method in 41 infants of smoking mothers and in 59 apparently healthy control infants. Although gestational age, birth weight, and systolic blood pressure were lower in infants exposed to tobacco smoke prenatally, systolic (65±11 vs. 47±12 cm/s, mean ±SD;P〈0.001), mean (36±6 vs. 25±6 cm/s;P〈0.001), and diastolic (17±4 vs 13±4 cm/s;P〈0.001) CBFVs in the anterior cerebral artery were significantly higher when compared to control infants. Similar differences were seen in the internal carotid and in the basilar arteries. Multiple regression analysis did not reveal differences other than maternal smoking to explain these observations. We conclude that prenatal tobacco smoke exposure is related to increased CBFVs in newborn infants. Further studies should determine whether this relation is not only statistical but causal and whether increased CBFVs are an indicator of prolonged effects of prenatal tobacco smoke exposure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01956151
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Hautveränderungen bei Neugeborenen in den ersten 5 Lebenstagen (2000)
    Springer
    Der Hautarzt 51 (2000), S. 396-400 
    Details
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Kongenitale Hautveränderungen ; Naevus flammeus ; Melanozytärer Nävus ; Key words Congenital skin lesions ; Nevus flammeus ; Melanocytic nevus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background and Objective. To prospectively survey skin lesions in a large group of newborns, as no such study has as yet been performed in Germany. Patients/Methods. In a prospective study, we examined one thousand newborn babies twelve to 120 hours old. Results. In 59.7%, one or more skin lesions could be detected, some of which were only transient. Noticeable differences from other studies included a higher incidence of congenital melanocytic nevi (6%) and port wine stains (2,8%). lnstead of the usual male:female ratio of 1:2 we found a 1:1 ratio for port wine stains. Toxic erythema of the newborn and milia were less frequent than in other studies. Conclusions. With a frequency of 37.2%, vascular lesions such as nevus flammeus and hemangioma are the most common skin lesions in newborns. Our study found a higher incidence of congenital melanocytic nevi than reported in literature. An associated of skin lesions and maternal smoking during pregnancy was not detected.
    Notes: Zusammenfassung Hintergrund und Fragestellung. Für den deutschsprachigen Raum existiert keine umfassende Studie über die Häufigkeit und Verteilung von Hautveränderungen bei Neugeborenen. Ziel der Studie war es, diese zu erfassen. Patienten/Methodik. Im Rahmen einer prospektiven Studie wurden 1000 Neugeborene innerhalb der ersten 120 Lebensstunden untersucht. Ergebnisse. Eine oder mehrere z. T. transiente Hautveränderungen zeigten 59,7% der Kinder. Unterschiede des untersuchten Kollektivs zu bisherigen Studien zeigten sich in einem häufigeren Vorkommen von kongenitalen melanozytären Nävi (6%) und Naevi flammei (2,8%). Bei den Naevi flammei wurde anstelle der üblichen Verteilung von 2 Jungen zu 1 Mädchen eine Verteilung von 1:1 festgestellt. Das Erythema toxicum neonatorum und Milien kamen seltener vor. Schlussfolgerungen. Vaskuläre Hautveränderungen wie Naevus flammeus und Hämangiom mit zusammen 37,2% stellen den Hauptanteil der Hautveränderungen bei Neugeborenen dar. Kongenitale melanozytäre Nävi traten häufiger als bisher beschrieben auf. Zusammenhänge zwischen einem gehäuften Auftreten von Hautveränderungen beim Kind und Nikotinkonsum in der Schwangerschaft konnten nicht gezeigt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001050051140
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Asymptomatischer Thrombus in der Pulmonalarterie Heterozygote Resistenz gegen aktiviertes Protein C (APC-Resistenz) (1999)
    Springer
    Monatsschrift Kinderheilkunde 147 (1999), S. 275-278 
    Details
    ISSN: 1433-0474
    Keywords: Schlüsselwörter APC-Resistenz ; Säugling ; Thrombus der Pulmonalarterie ; Key words APC-Resistence ; Infant ; Thrombosis of the Pulmonary Artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A clinically healthy 6 week old infant underwent cardiological examination because of a slight heart murmur. On echocardiography, we detected a round thrombus of 4 millimeters diameter originating in the ductus arteriosus Botalli and extending into the pulmonary artery. Molecular testing (PCR amplification method) revealed a heterozygous mutation responsible for factor V Leiden. No additional risk factors could be detected neither in the case history nor in the laboratory findings. The clinical course until the age of 17 months remained normal. She was not treated, but a prophylactical anticoagulation is recommended for the case of risk situations (surgery, menstruation, pregnancy). Discussion: Until now carriers of the factor V Leiden were divided into symptomatic patients and healthy carriers. Our case shows, that heterozygous APC-resistance may cause asymptomatic thrombosis in seemingly healthy neonates.
    Notes: Zusammenfassung Es wird über einen klinisch gesunden, 6 Wochen alten Säugling berichtet, der aufgrund eines leisen Herzgeräusches kardiologisch untersucht wurde. Echokardiographisch fand sich ein rundlicher, aus dem Ductus arteriosus in die Pulmonalarterie reichender Thrombus von 4 mm Durchmesser. Wir konnten molekulargenetisch eine heterozygote APC-Resistenz nachweisen. Zusätzliche Risikofaktoren fanden sich weder in der Anamnese noch unter den untersuchten Laborparametern. Der bisher beobachtete Verlauf bis zum Alter von 17 Monaten blieb komplikationslos. Es erfolgte keine Therapie, sondern eine Beratung der Familie zu einer prophylaktischen Antikoagulation in Risikosituationen (z.B. operative Eingriffe, Wochenbett). Diskussion: Bislang erfolgte eine Unterteilung der Träger des Faktor-V-Leiden in symptomatische Patienten und asymptomatische Träger. Unser Fall zeigt, daß die heterozygote APC-Resistenz auch asymptomatische Thrombosen bei anscheinend gesunden Neugeborenen verursachen kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001120050420
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  • 6
    Electronic Resource
    Electronic Resource
    Hypoxie-Ischämie unter der Geburt (1999)
    Springer
    Monatsschrift Kinderheilkunde 147 (1999), S. 855-865 
    Details
    ISSN: 1433-0474
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001120050512
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