منابع مشابه
Basic Principles of Vacuum Slot Extraction
Vacuum slot extraction is becoming more popular In textile wet processing because of its energy efficiency and other economic benefits. The baric princlples of vacuum slot extraction are reviewed. The function of the components of a vacuum extractor and the mechanism of liquid removal from the fabric are discussed. The effects of the most important variables controlling the final water content ...
متن کاملFoetal and maternal outcome of vacuum extraction.
In a prospective study, 167 vacuum extractions (VE) performed at the Kenyatta National Hospital, Nairobi, formed 6.3% of the total deliveries. Most patients were young and of low parity. There were no maternal deaths. The overall maternal morbidity rate was 22% and were mostly minor. Post partum haemorrhage was the most common maternal complication. There were 5 failed VEs. Perinatal morbidity ...
متن کاملRetinal hemorrhage and vacuum extraction delivery.
The purpose of this prospective study was to investigate whether there is an increased risk of retinal hemorrhage in those infants delivered with the assistance of the silastic vacuum extractor from mothers who were low-risk and who had normal labors. Ocular fundi of 38 term newborns (19 vacuum assisted deliveries, 19 spontaneous deliveries) were examined for retinal hemorrhage within 72 hours ...
متن کاملA computer-based simulation of vacuum extraction during childbirth
Vacuum extraction is an instrumental method used in obstetrics when childbirth labour fails to progress. The instrument used during vacuum extraction is the ventouse. It comprises of a suction cup attached to the fetal scalp through a vacuum, and a chord or chain to apply a traction force to expedite the delivery of the baby. It is claimed in the obstetric literature that incorrect placement of...
متن کاملOn the Feigel Effect: Extraction of Momentum from Vacuum?
The Green-function formalism for the electromagnetic field in a magnetoelectric (ME) medium is constructed, as a generalization of conventional Casimir theory. Zero temperature is assumed. It is shown how the formalism predicts electromagnetic momentum to be extracted from the vacuum field, just analogous to how energy is extracted in the Casimir case. The possibility of extracting momentum fro...
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ژورنال
عنوان ژورنال: American Journal of Ophthalmology
سال: 1922
ISSN: 0002-9394
DOI: 10.1016/s0002-9394(22)90003-0