Experimental Verification of a Novel System for the Growth of SiC Single Crystals

2011 ◽  
Vol 679-680 ◽  
pp. 16-19
Author(s):  
Krzysztof Grasza ◽  
Emil Tymicki ◽  
Katarzyna Racka ◽  
Marek Orzyłowski
Keyword(s):  
Temperature Field ◽  
Crystal Growth ◽  
Induction Furnace ◽  
Crystallization Front ◽  
Experimental Tests ◽  
Crystal Length ◽  
Positive Results ◽  
Growth Experiments ◽  
Similar Intensity

A set of single crystal growth experiments was performed in the new resistively heated two-heater furnace, which plays the role of an induction furnace with a moving coil. In this new experimental setup we are able to control the shape of the crystallization front, from flat to extremely convex. The positive results of the experimental tests differ significantly from prior discouraging interpretation of computational modeling results obtained by a commonly used software, previously presented in the literature. The essence of a new regulation of the temperature field during the crystal growth is a displacement of the maximum of the temperature field, which at the beginning of the growth is located close to the seed and it moves towards the source material as the crystal length increases. In this way, the crystallization front is heated with a similar intensity regardless the increasing crystal length.

Ti-in-quartz: Evaluating the role of kinetics in high temperature crystal growth experiments

2020 ◽  
Vol 281 ◽  
pp. 149-167 ◽  
Author(s):  
Marisa D. Acosta ◽  
James M. Watkins ◽  
Mark H. Reed ◽  
John J. Donovan ◽  
Donald J. DePaolo
Keyword(s):  
Crystal Growth ◽  
High Temperature ◽  
Growth Experiments ◽  
Ti In Quartz

Double-Balloon Enteroscopy in Detecting Small-Bowel Neuroendocrine Neoplasms: A Single-Center Prospective Study

Digestion ◽  
2020 ◽  
pp. 1-9
Author(s):  
Roberta Elisa Rossi ◽  
Luca Elli ◽  
Federica Branchi ◽  
Dario Conte ◽  
Sara Massironi
Keyword(s):  
Small Bowel ◽  
Neuroendocrine Neoplasm ◽  
Unknown Primary ◽  
Neuroendocrine Neoplasms ◽  
Double Balloon Enteroscopy ◽  
Balloon Enteroscopy ◽  
Double Balloon ◽  
Diagnostic Role ◽  
Positive Results

<b><i>Background and Aim:</i></b> Small-bowel neuroendocrine neoplasm (sbNEN) diagnosis has improved with double-balloon enteroscopy (DBE). DBE efficacy in the detection of sbNENs is unknown. We aimed to report the experience at a single referral center for NENs. <b><i>Methods:</i></b> All consecutive patients with a suspected sbNEN selected for diagnostic DBE were enrolled. <b><i>Results:</i></b> Between 2011 and 2016, 25 patients were referred for a suspected sbNEN. In 15/25 patients, a primary NEN was detected outside the small bowel; in 4, NEN was excluded. After extensive workup, 6 patients (4 males, median age 50 years) underwent DBE (3 anterograde, 2 retrograde, and 1 both; median time: 60 min; median insertion 200 cm). DBE was positive in 3 patients: one had an ileal 2-cm NEN G1, one had an ileal 1.3-cm NEN G1, and one had an ileal 1-cm NEN G2, all surgically removed. Of the 3 other patients, one had a metastatic NEN of unknown primary, the other two had small intestinal NENs, both surgically removed (1.6-cm G1 and G2 NEN). DBE showed a sensitivity of 60% and, in absence of false-positive results, a specificity of 100%. Accuracy resulted 67%. No complications were observed. <b><i>Conclusions:</i></b> In line with data from the literature, the present series showed that DBE is a safe and effective procedure in the diagnosis of sbNENs. Further studies are needed to better clarify the diagnostic role of DBE in the neuroendocrine tumor setting and its relationship with other techniques.

Spin-Lattice Coupling and Peculiarities of Magnetic Behavior of Ferrimagnetic Ludwigites Mn0.52+M1.52+Mn3+BO5(M=Cu, Ni)

2015 ◽  
Vol 233-234 ◽  
pp. 133-136 ◽  
Author(s):  
Leonard Bezmaternykh ◽  
Evgeniya Moshkina ◽  
Evgeniy Eremin ◽  
Maxim Molokeev ◽  
Nikita Volkov ◽  
...  
Keyword(s):  
Temperature Field ◽  
Low Temperature ◽  
Magnetic Anisotropy ◽  
Single Crystals ◽  
Magnetic Behavior ◽  
Temperature Hysteresis ◽  
Spin Lattice ◽  
Field Magnetization ◽  
Lattice Coupling

Temperature-field and orientational magnetization dependences of single crystals were measured. Both samples demonstrate significant field-depending temperature hysteresis and low-temperature counter field magnetization. The correlation of orientational dependences of these effects and magnetic anisotropy is analyzed; the role of spin-lattice interactions is discussed.

Role of MR venography in the evaluation of deep venous thrombosis

1997 ◽  
Vol 38 (5) ◽  
pp. 907-912 ◽  
Author(s):  
C. Catalano ◽  
P. Pavone ◽  
A. Laghi ◽  
A. Scipioni ◽  
F. Fanelli ◽  
...  
Keyword(s):  
Venous Thrombosis ◽  
Deep Venous Thrombosis ◽  
Sensitivity And Specificity ◽  
Filling Defect ◽  
Clinical Suspicion ◽  
Mr Venography ◽  
Diagnostic Modalities ◽  
Positive Results ◽  
Intraluminal Filling Defect

Purpose: MR venography has been recommended for the evaluation of deep venous thrombosis. The purpose of our study was to determine the role of MR venography, in particular at the level of the pelvis where other diagnostic modalities show major limitations. Materials and Methods: Forty-three patients with clinical suspicion of deep venous thrombosis were examined by means of pelvic MR venography. In all cases, a 2D-TOF sequence was used with cranial arterial presaturation. In selected cases, i.e. when a small intraluminal filling defect was present, a cine-PC sequence was used in addition in order to exclude the presence of a pulsatility artifact as causing the filling defect. In all cases, contrast venography was also performed and considered to be the standard of reference. Results: MR venography showed 26 patients to be positive for deep venous thrombosis at the pelvic level. These positive results were correct in 25 cases. The analysis of the results provided values of sensitivity and specificity of respectively 100% and 94%, with an overall accuracy of 97.6%. Conclusion: Our results indicate that MR can provide highly accurate images, similar to those of contrast venography, in a noninvasive fashion. It is particularly useful in the pelvic region where the limitations of other imaging modalities are more evident.

scholarly journals On the Mechanism of Cuprate Crystal Growth: The Role of Mixed Metal Carbonates

2015 ◽  
Vol 25 (29) ◽  
pp. 4700-4707 ◽  
Author(s):  
David C. Green ◽  
Rebecca Boston ◽  
Stefan Glatzel ◽  
Martin R. Lees ◽  
Stuart C. Wimbush ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Mixed Metal ◽  
Metal Carbonates

scholarly journals The role of fathers in the postpartum period: experiences with skin to skin method

2012 ◽  
Vol 25 (6) ◽  
pp. 914-920 ◽  
Author(s):  
Joaquín Jesús Blanca Gutiérrez ◽  
María del Rosario Ábalos Pérez ◽  
Maria Victoria Montes Aguilera ◽  
Soledad González Moreno
Keyword(s):  
Health Professionals ◽  
Qualitative Method ◽  
Simple Technique ◽  
Contact Method ◽  
Skin Contact ◽  
Father’S Role ◽  
Skin To Skin ◽  
Depth Interviews ◽  
Positive Results

OBJECTIVE: This study aimed at investigating the significance of the skin-to-skin contact method with fathers, looking at their own experiences with their newborns. METHODS: The information was collected through in-depth interviews with 14 fathers who had used the skin-to-skin contact method with their newborns, after a cesarean delivery. The technique utilized for data analysis was the qualitative method of content analysis. RESULTS: Four principal themes emerged from the data: the preparation for the skin-to-skin method, the experiences of the fathers, the father's role, and effects of the method on the baby. CONCLUSIONS: The investigations performed highlighted the importance of the involvement of health professionals in the use of this method, which leads to a series of positive results for the organization related to satisfaction. We conclude that the skin-to-skin method is a simple technique, recommended for positive results for fathers and their babies.

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