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71.
72.
Smaïl Benbarek Bel Abbes Bachir Bouiadjra Bouziane Mohamed El Mokhtar Tarik Achour Boualem Serier 《Materials science & engineering. C, Materials for biological applications》2013,33(1):543-549
In this study, we use the finite element method to analyze the propagation's path of the crack in the orthopedic cement of the total hip replacement. In fact, a small python statement was incorporated with the Abaqus software to do in loop the following operations: extracting the crack propagation direction from the previous study using the maximal circumferential stresses criterion, drawing the new path, meshing and calculating again (stresses and fracture parameters). The loop is broken when the user's desired crack length is reached (number of propagations) or the value of the mode I stress intensity factor is negative. Results show that the crack propagation's path can be influenced by human body posture. The existing of a cavity in the vicinity of the crack can change its propagation path or can absolutely attract it enough to meet it. Crack can propagate in the outward direction (toward the acetabulum bone) and cannot propagate in the opposite direction, the mode I stress intensity factor increases with the crack length and that of mode II vanishes. 相似文献
73.
In this study, the 1.0 m H2SO4 solution was used as a sulphur source to sulphurise apricots. Apricot samples were immersed into 1.0 m H2SO4 solution at room temperature for time of 30, 60 , 120, 180 and 240 min. Amounts of vitamins (A, C and E) and malondialdehyde (MDA) were determined as function of sulphurisation time and thus, sulphur content. It was determined that the optimum immersion time for sufficient sulphur content is 120 min. It is concluded that while amounts of vitamins decrease, the level of MDA increases with increasing immersion time and thus, sulphur contents. 相似文献
74.
The noncondensable gas supported bubbles in an arterial heat pipe are studied. The governing conservation equations are solved to study the growth/collapse of spherical bubbles under different conditions by using the finite element method. The criterion used in the design of the venting pores to prime the artery is explained. The diffusion-limited bubble collapse in the condenser and bubble growth due to the phase change in the evaporator are both studied. A theoretical explanation for the capability of venting bubbles under different scenarios is provided. The experimental results, including rapid startup and condenser cooldown, are also presented to prove the ability of the heat pipes to vent vapor–gas bubbles. 相似文献
75.
Limbu Narayan Alsadoon Abeer Prasad P.W.C. Abdullah Salma Rashid Tarik A. Alsadoon Omar Hisham Jerew Oday D. Alrubaie Ahmad 《Multimedia Tools and Applications》2022,81(27):38569-38592
Multimedia Tools and Applications - Convolutional neural network (CNN) classification has not achieved a medically-satisfied level of accuracy in sleep apnea detection due to the negative effect of... 相似文献
76.
Hayouni Mohamed Choubani Fethi Vuong Tan-Hoa David Jacques 《Wireless Personal Communications》2017,95(4):4243-4256
Wireless Personal Communications - Three compact monopole ultrawideband (UWB) antennas with half-wavelength symmetric circular slots etched on the radiating patch and operating in the UWB spectrum... 相似文献
77.
Power-domain non orthogonal multiple access (PD-NOMA) in cooperative networks: an overview 总被引:1,自引:0,他引:1
Liaqat Mahrukh Noordin Kamarul Ariffin Abdul Latef Tarik Dimyati Kaharudin 《Wireless Networks》2020,26(1):181-203
Wireless Networks - Non-orthogonal multiple access (NOMA) scheme is emerging as a favourable multiple access scheme for future 5G networks. Compared to orthogonal multiple access techniques, NOMA... 相似文献
78.
79.
Gheith Ramla Aloui Fethi Nasrallah Sassi Ben 《Journal of Mechanical Science and Technology》2012,26(4):1251-1255
A gamma Stirling engine with compressed air as working fluid was investigated. This engine operates at a maximum charge pressure
of 10 bar, runs at a maximum rotation speed of 600 rpm and can provide 500 W of brake power on the shaft. The engine is equipped
with several pressure sensors and thermocouples. This experimental study concentrates on the regenerator constituting material
(porous medium). Four different materials were investigated: stainless steel, copper, aluminum and Monel 400. The obtained
experimental results provide guidance to Stirling engine enhancement and selection of the appropriate regenerator material.
As a conclusion, the regenerator has an important role to enhance the heat exchange and to improve Stirling engine performance,
which closely depends on its constituting material. 相似文献
80.
Hamed Dehghanpour Baruj Iklim Bozkaya Betul Canimkurbey Ahmet Tarik Isik Farzan Shabani Savas Delikanli Sushant Shendre Onur Erdem Furkan Isik Hilmi Volkan Demir 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(29):2206582
Semiconductor colloidal quantum wells (CQWs) provide anisotropic emission behavior originating from their anisotropic optical transition dipole moments (TDMs). Here, solution-processed colloidal quantum well light-emitting diodes (CQW-LEDs) of a single all-face-down oriented self-assembled monolayer (SAM) film of CQWs that collectively enable a supreme level of IP TDMs at 92% in the ensemble emission are shown. This significantly enhances the outcoupling efficiency from 22% (of standard randomly-oriented emitters) to 34% (of face-down oriented emitters) in the LED. As a result, the external quantum efficiency reaches a record high level of 18.1% for the solution-processed type of CQW-LEDs, putting their efficiency performance on par with the hybrid organic-inorganic evaporation-based CQW-LEDs and all other best solution-processed LEDs. This SAM-CQW-LED architecture allows for a high maximum brightness of 19,800 cd m−2 with a long operational lifetime of 247 h at 100 cd m−2 as well as a stable saturated deep-red emission (651 nm) with a low turn-on voltage of 1.7 eV at a current density of 1 mA cm−2 and a high J90 of 99.58 mA cm−2. These findings indicate the effectiveness of oriented self-assembly of CQWs as an electrically-driven emissive layer in improving outcoupling and external quantum efficiencies in the CQW-LEDs. 相似文献