Search results for "Surface reconstruction"

showing 3 items of 23 documents

Size control of InAs∕InP(001) quantum wires by tailoring P∕As exchange

2004

The size and emission wavelength of self-assembled InAs∕InP(001) quantum wires (QWrs) is affected by the P∕As exchange process. In this work, we demonstrate by in situ stress measurements that P∕As exchange at the InAs∕InP interface depends on the surface reconstruction of the InAs starting surface and its immediate evolution when the arsenic cell is closed. Accordingly, the amount of InP grown on InAs by P∕As exchange increases with substrate temperature in a steplike way. These results allow us to engineer the size of the QWr for emission at 1.3 and 1.55 μm at room temperature by selecting the range of substrate temperatures in which the InP cap layer is grown.

Work (thermodynamics)Materials scienceOptical fiberPhysics and Astronomy (miscellaneous)Substrate (electronics)Optoelectronic deviceslaw.inventionEmissionOptical fibreslawIndium compoundsArsenic compoundsSize effectPhosphorus compoundsRange (particle radiation)business.industrySelf-assemblyWavelengthSemiconductor quantum wiresOptoelectronicsSelf-assemblybusinessSurface reconstructionLayer (electronics)Surface reconstruction
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3D-CT von Frakturen: Vergleich von Volumen- und Oberflächen-Rekonstruktionen

1998

Purpose The comparison of volume rendering (VR) and surface rendering (SSD) for demonstrating fractures from spiral-CT data. Materials and methods Standardized VR and SSD projections were produced from 50 spiral CT scans of 50 consecutive patients with fractures. Appropriate multiplanar reformattings (MPR) were used as the standard. Results SSD provided sufficient information in 31/50 cases. Results of VR were not significantly different (33/50). VR was superior in demonstrating 6/7 craniofacial fractures and 3/3 calcaneal fractures. SSD was superior for visualizing 2/3 shoulder fractures and 2/2 elbow fractures. Conclusion VR is a flexible technique for the depiction of fractures and the a…

business.industryShoulder FractureElbowVolume renderingmedicine.anatomical_structureMedicineRadiology Nuclear Medicine and imagingTomographyCraniofacialbusinessNuclear medicineSurface reconstructionSpiralVolume (compression)RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren
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Three-dimensional ultrasonography in prenatal diagnosis

1995

Within the past five years, 3D ultrasonography has developed to the degree that it offers both the patient and the examiner an entirely new visual experience in prenatal diagnosis. With the system described here (Kretz-technik, Austria), any desired plane can be displayed within the stored volume, and within seconds a high-quality 3D surface or transparent image can be calculated and displayed on the ultrasound monitor without need for an external workstation. All of this can be performed routinely in the clinical setting. Since 1989 we have routinely examined a total of 458 fetuses (242 normal and 216 with anomalies) between 16 and 38 weeks of gestation, supplementing our conventional 2D u…

business.industryUltrasoundObstetrics and GynecologyImage processingOligohydramniosPrenatal diagnosisImage planemedicine.diseaseStereo displayUltrasonography PrenatalCongenital AbnormalitiesFetal DiseasesFetusPregnancyPediatrics Perinatology and Child HealthImage Processing Computer-AssistedmedicineHumansFemalebusinessNuclear medicineSurface reconstructionVolume (compression)jpme
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