Theoretical analysis and experimental research on transcritical CO2 two stage compression cycle with two gas coolers (TSCC+TG) and the cycle with intercooler (TSCC+IC)

2011 ◽  
Vol 52 (8-9) ◽  
pp. 2819-2828 ◽  
Author(s):  
Hongli Wang ◽  
Yitai Ma ◽  
Jingrui Tian ◽  
Minxia Li
Keyword(s):  
Theoretical Analysis ◽  
Experimental Research ◽  
Two Stage ◽  
Compression Cycle

Investigation of the component exergy efficiencies of a two stage vapour compression cycle

2018 ◽  
Vol 27 (1) ◽  
pp. 43
Author(s):  
Sertac Samed Seyitoglu ◽  
Ali Kilicarslan
Keyword(s):  
Two Stage ◽  
Compression Cycle ◽  
Vapour Compression

Abstract 19197: No Difference in Retention of BLS/AED Skills When Teaching Laypersons Using Four-stage and Two-stage Teaching Technique: A Randomized Comparison

Circulation ◽  
2015 ◽  
Vol 132 (suppl_3) ◽  
Author(s):  
Katrine Bjørnshave ◽  
Lise Q Krogh ◽  
Svend B Hansen ◽  
Mette A Nebsbjerg ◽  
Troels Thim ◽  
...  
Keyword(s):  
Chest Compression ◽  
Health Care Professionals ◽  
Pass Rate ◽  
Two Stage ◽  
Compression Depth ◽  
Training Technique ◽  
Resuscitation Training ◽  
Compression Cycle ◽  
Teaching Technique ◽  
Total Average

Introduction: The ability of laypersons to perform BLS/AED increases immediately after resuscitation training. Studies indicate that resuscitation skills rapidly decay after initial training, however it is unknown whether teaching technique influence retention of skill. Aim: To study the retention of BLS/AED skills three months after training when teaching laypersons using a four-stage and two-stage teaching technique. Methods: Laypersons (exclusion: health care professionals/students) were randomized to a standardized ERC BLS/AED courses using the four-stage teaching technique or to courses with the same content but modified to a two-stage teaching technique. Participants were tested in a simulated cardiac arrest scenario three months (±five days) after their course to assess retention of BLS/AED. Tests were video recorded and reviewed by two independent assessors blinded to training technique. Skills were assessed using the ERC BLS/AED assessment form. The primary endpoint was passing the test (17 out of 17 skills adequately performed). Results: A total of 160 participants were included in the study. No difference was found in pass rate immediately after training (diff. -1.6%; 95%CI -17.9%; 14.6%). There was no statistical difference in retention of BLS/AED skills (pass rate: both 11%, diff. -0.4%; 95%CI -28%-27%) three months after training . Total average skills adequately performed (of 17) were 13.7 versus 13.3 among laypersons trained with the four-stage (n=64) and the two-stage technique (n=64). No difference was found in number of chest compressions delivered per compression cycle (29±2.8 vs 30±3.1), chest compression rate (107±17 vs 108±19 minute-1), chest compression depth (46±11 vs 43±12 mm), number of effective rescue breaths between compression cycles (1.6±0.7 vs 1.6±0.5) and tidal volume (0.6±0.4 0.7±0.4 L). Conclusion: We found no difference in retention of BLS/AED skills among laypersons taught using a four-stage teaching technique compared to a two-stage teaching technique.

Theoretical Analysis and Experimental Research on the Broken Critical-Position of Coating Interface

2008 ◽  
Vol 35 (11) ◽  
pp. 1746-1751 ◽  
Author(s):  
冯爱新 Feng Aixin ◽  
叶勇 Ye Yong ◽  
殷苏民 Yin Sumin ◽  
程昌 Cheng Chang ◽  
曹宇鹏 Cao Yupeng
Keyword(s):  
Theoretical Analysis ◽  
Experimental Research ◽  
Critical Position

STABILITY PROBLEMS OF STEEL‐CONCRETE MEMBERS COMPOSED OF HIGH‐STRENGTH MATERIALS

2010 ◽  
Vol 16 (3) ◽  
pp. 352-362 ◽  
Author(s):  
Zdeněk Kala ◽  
Libor Puklický ◽  
Abayomi Omishore ◽  
Marcela Karmazínová ◽  
Jindřich Melcher
Keyword(s):  
Theoretical Analysis ◽  
Experimental Research ◽  
Carrying Capacity ◽  
High Strength ◽  
Statistical Characteristics ◽  
Load Carrying Capacity ◽  
Limit States ◽  
Load Carrying ◽  
Geometrical Imperfections

The presented paper deals with the stochastic analysis of the ultimate limit states of steel‐concrete building members. The load carrying capacity of steel‐concrete columns, comprising of steel profiles encased in high strength concrete, in compression is analyzed. The first part of the paper lists assumptions for the determination of the theoretical load carrying capacity of the column. Principles of elasticity and plasticity are used to determine stresses in the concrete and steel sections. Statistical characteristics of input material and geometrical imperfections are listed. Results of the theoretical analysis are then compared with results of experimental research. Statistical characteristics of obtained results of the theoretical analysis were verified using statistical characteristics obtained from experimental research. Numerical simulation LHS and Monte Carlo methods, which take into account the influences of variability of input imperfections, were employed. The influence of the utilization of the plastic reserve in the determination of the load carrying capacity of the analysed strut is shown. The influence of the initial geometric imperfections of initial strut curvature on the load carrying capacity is also presented. Santrauka Straipsnyje pateikta plienbetonio pastatu elementu didžiausiu ribiniu būkliu stochastine analize, analizuojama plienbetonio kolonu, sudarytu iš plieniniu profiliuočiu, padengtu didelio stiprio betonu, laikomoji galia gniuždant. Pirmoje straipsnio dalyje išvardytos kolonos teorines laikomosios galios nustatymo prielaidos. Tamprumo ir plastiškumo principai taikyti itempiams betono ir plieno skerspjūviuose nustatyti. Nustatytos medžiagu ir geometriniu defektu statistines charakteristikos, teorines analizes rezultatai palyginti su eksperimentiniu tyrimu rezultatais. Teorines analizes metu gautu rezultatu statistines charakteristikos patikrintos taikant iš eksperimentiniu tyrimu gautus statistinius rodiklius. Pritaikytas skaitinis modeliavimas LHS ir Monte Karlo metodais, kurie ivertina pradiniu defektu kintamumo itaka. Parodyta plastiškumo atsargos naudojimo itaka, nustatant analizuojamojo statramsčio laikomaja galia, pateikta pradinio statramsčio išlinkio pirminiu geometriniu defektu itaka laikomajai galiai.

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