RESUMEN
The nanomechanical properties of thin silicon films will become increasingly critical in semiconductor devices, particularly in the context of substrates that consist of a silicon film on an insulating layer (known as silicon-on-insulator, or SOI, substrates). Here we use very small germanium crystals as a new type of nanomechanical stressor to demonstrate a surprising mechanical behaviour of the thin layer of silicon in SOI substrates, and to show that there is a large local reduction in the viscosity of the oxide on which the silicon layer rests. These findings have implications for the use of SOI substrates in nanoelectronic devices.
Asunto(s)
Equilibrio Ácido-Base , Anestesia Obstétrica/métodos , Terapia por Estimulación Eléctrica , Feto/metabolismo , Recién Nacido/sangre , Trabajo de Parto/sangre , Parto Normal , Estimulación Eléctrica Transcutánea del Nervio , Análisis de los Gases de la Sangre , Femenino , Humanos , Embarazo , Factores de TiempoAsunto(s)
Enfermedades Placentarias/diagnóstico , Insuficiencia Placentaria/diagnóstico , Ultrasonografía , Femenino , Edad Gestacional , Humanos , Recién Nacido , Posmaduro , Recien Nacido Prematuro , Placenta/patología , Insuficiencia Placentaria/patología , Embarazo , Diagnóstico Prenatal/métodosAsunto(s)
Mastitis/diagnóstico , Infección Puerperal/diagnóstico , Ultrasonografía , Absceso/diagnóstico , Adolescente , Adulto , Mama/patología , Femenino , Humanos , EmbarazoAsunto(s)
Anomalías Múltiples/diagnóstico , Diagnóstico Prenatal/métodos , Ultrasonografía , Anomalías Múltiples/patología , Anomalías del Sistema Digestivo , Atresia Esofágica/diagnóstico , Atresia Esofágica/patología , Femenino , Humanos , Recién Nacido , Microcefalia/diagnóstico , Microcefalia/patología , Embarazo , Tercer Trimestre del EmbarazoRESUMEN
PIP: The authors report on their experience with application of urethral balloon-catheter with a volume of 75-100 ml for pregnancy interruption due to obstetric indications after the 20th week of gestation. The study was carried out on 22 women and failure was recorded in only 1 case. All the pregnant women had a low pelvic score--from 0-4--but 11 had live fetuses. Oxytocin infusion (during placement of the balloon or during the course of delivery) was used in 19 women. The dilatation, obtained by the balloon-catheter, was from 4-6 cm and took about 4 hours on the average; duration of delivery was 10 hours on the average. No complications were recorded. The authors feel that the application of a urethral balloon-catheter replaces successfully the original obstetric-balloon catheter of Slavcev-Minceva after the 20th week of gestation, and its use in obstetric practice is recommended. (author's modified)^ieng