Critical Pressure of Conical Acrylic Windows Under Short-Term Hydrostatic Loading

1967 ◽  
Vol 89 (3) ◽  
pp. 417-425
Author(s):  
J. D. Stachiw
Keyword(s):  
Experimental Study ◽  
Critical Pressure ◽  
Short Term ◽  
Included Angle ◽  
Hydrostatic Loading

An experimental study has been conducted to determine the critical pressure of conical acrylic windows under short-term hydrostatic loading. Conical windows with 30, 60, 90, 120, and 150 deg included angle, and thickness-to-diameter ratios in the 0.125 to 1.0 range have been tested to destruction. Both their critical pressures and displacements through the mounting have been recorded and plotted for ready reference of designers.

Effect of Temperature and Flange Support on Critical Pressure of Conical Acrylic Windows Under Short Term Pressure Loading

1972 ◽  
Vol 94 (4) ◽  
pp. 853-861
Author(s):  
J. D. Stachiw
Keyword(s):  
Critical Pressure ◽  
Effect Of Temperature ◽  
Short Term ◽  
Ambient Temperatures ◽  
Seating Arrangement ◽  
Hydrostatic Loading ◽  
Percent Increase ◽  
Standard Of Comparison ◽  
The Relationship ◽  
Percent Decrease

Temperature and the seating arrangement in the flange have a significant effect on the critical pressure of conical acrylic windows. Over 400 acrylic windows with 90 deg conical angle were used in this study to establish experimentally the relationship between thickness to minor diameter ratio (t/D), temperature, seating arrangement in the flange, and critical pressure under short term hydrostatic loading. The data indicates that utilizing 70 deg F as standard of comparison, there is, approximately 20 percent increase in critical short term pressure when 32 deg F, and 20 percent decrease when 90 deg F ambient temperatures are utilized, respectively. It was also found that the short term critical pressure of some conical acrylic windows is influenced by the seating arrangement in the flange. As a rule, an increase in the ratio of minor window diameter to minor flange opening diameter (D/Df) raised the short term critical pressure of windows with t/D ≥ 0.375 significantly. For windows with t/D < 0.375, it did not raise the critical pressure.

Does short-term odour memory increase with expertise? An experimental study with perfumers, flavourists, trained panellists and novices

2011 ◽  
Vol 26 (6) ◽  
pp. 408-415 ◽  
Author(s):  
Dominique Valentin ◽  
Catherine Dacremont ◽  
Isabelle Cayeux
Keyword(s):  
Experimental Study ◽  
Short Term

scholarly journals USEFULNESS OF GASTRIC SUBMUCOSAL DISSECTION DEPTH TO EVALUATE SKILL ACQUIREMENT IN SHORT TERM TRAINING COURSES IN ESD: AN EXPERIMENTAL STUDY

2018 ◽  
Vol 55 (3) ◽  
pp. 221-229 ◽  
Author(s):  
Kendi YAMAZAKI ◽  
Eduardo Guimarães Hourneaux de MOURA ◽  
Mariana Matera VERAS ◽  
Luiz Henrique MESTIERI ◽  
Paulo SAKAI
Keyword(s):  
Experimental Study ◽  
Adverse Events ◽  
Learning Curve ◽  
Intraoperative Complications ◽  
Gastric Body ◽  
Short Term ◽  
Roc Curve Analysis ◽  
The Third ◽  
Submucosal Dissection ◽  
Training Courses

ABSTRACT BACKGROUND: Endoscopic submucosal dissection (ESD) is a complex endoscopic procedure, with high rates of adverse events and technical difficulties. To overcome that problem, many training centers published the importance of animal models for skill acquirement in ESD. However, no study has used the submucosal dissection depth (DSUB) as a parameter to evaluate the learning curve in ESD, which might be a relevant factor since an optimal resection plane is important to achieve a curative resection and avoid intraoperative complications. OBJECTIVE: This study aimed to assess ESD skill acquirement after short-term training sessions by evaluating the submucosal dissection depth (DSUB) and the association with adverse events. METHODS: This experimental study included 25 experienced endoscopists in therapeuthic procedures (>5years) and 75 specimens resected by ESD (three resections / endoscopist). Learning parameters (resection time, size, en bloc resection rate, bleeding, perforation and submucosal dissection depth) were prospectively evaluated. The percentages of DSUB of all specimens resected were calculated. RESULTS: All specimens were resected from the gastric body (n=75). The mean size of the resected specimens was 23.97±7.2 mm. The number of adverse events, including bleeding, perforation, and death, were 17 (22.67%), 3 (4%), and 0 cases, respectively. The average mean time by the third dissection decreased from 28.44±9.73 to 18.72±8.81 min (P<0.001). The proportion of DSUB in the bleeding and non-bleeding group were respectively 37.97%±21.13% and 68.66%±23.99%, indicating a significant association between DSUB and bleeding incidence (P<0.001). The ROC curve analysis indicated a cut-off point of 61% (sensitivity, 64%; specificity, 94%) of submucosal dissection depth associated with bleeding. Therefore, when ESD was performed at a depth of >61% of the submucosal layer, the risk for bleeding during the procedure decreased (PPV, 0.97; 95% CI, 0.85-0.99). CONCLUSION: Improvement in the learning curve in ESD and a better cognitive ability were seen by the third dissection in these short term training courses. And a significant association between DSUB and the risk of bleeding.

scholarly journals Short-Term Memory Comparison Of Students Of Faculty Of Medicine Pelita Harapan University Batch 2015 Between The Handwriting And Typing Method

Medicinus ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 108
Author(s):  
Caroline Widjaja ◽  
Stefanus Satria Sumali
Keyword(s):  
Experimental Study ◽  
Short Term Memory ◽  
P Value ◽  
Short Term ◽  
Typing Method ◽  
Term Memory ◽  
New Information ◽  
Study Population ◽  
The Right ◽  
Experimental Study Design

<p>Introduction : A lot of research has been done to determine if handwriting or typing note influenced short-term memory, however, the results obtained are still controversial. Therefore this study is structured to see the effect of note taking methods by handwriting and typing on short-term memory.</p><p>Aim : The aims of this study were to increase the performance of students in Faculty of Medicine Pelita Harapan University as well as providing the right and effective method of taking notes.<strong></strong></p><p>Method : Experimental study design was chosen in this study. Study population is students of faculty of medicine Pelita Harapan University batch 2015. 40 samples will be divide randomly into two, one group will take a note by handwriting and another by typing. Each group is required to watch a video about 15 minutes long.  The results were analyzed statistically using T-test.</p><p>Result : The average of  new information that can be remembered by group that take a note by handwriting significantly (p&lt;0,05) higher than group than take a note by typing with a p-value of 0,009.</p><p>Conclusion : Take a note by handwriting allows people to remember more new information than typing.</p>

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