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<P><B>Abstract</B></P><P>Novel technique was introduced to improve fracture toughness of hydroxyapatite (HAp) bioceramics. Composites of HAp/NiO with 1–5wt% of electrospun NiO nanofibers were synthesized by wet-milling technique and the mixtures were consolidated rapidly to full density by high-frequency induction heat sintering (HFIHS). Effect of electrospun NiO nanofibers content on the toughness, hardness and microstructure properties was studied. The resulting composites showed good sintering behaviors, high toughness and hardness. Compared with the toughness of pure HAp, the heat sintered HAp/NiO nanofiber composites showed 200% increase in the toughness by the addition of 5wt% NiO nanofibers. This can be related to the homogeneous dispersion of NiO nanoparticles in HAp at nanometer scales.</P>
In this study, hydroxyapatite (HAp) and hydroxyapatite-yttria stabilized zirconia (HAp-3YSZ) with 20 vol. %- (ZrO2+3 %mol Y2O3) nanopowders were consolidated very rapidly to full density by High-frequency induction heat sintering (HFIHS). Effects of temperature and the addition of 3YSZ on the toughness, hardness and microstructure properties have been studied. 3YSZ second phase toughening HAp composites with higher toughness were successfully developed at relatively low temperatures through this technique. Compared with hardness and toughness obtained for pure HAp, the hardness and toughness for HAp-20vol. % 3YSZ were much higher.
Synthesis and Properties of Novel Flame-Retardant and Thermally Stable Poly(amide-imide)s from N,N`-(bicyclo[2,2,2]oct-7-ene-tetracarboxylic)-bis-L-amino Acids and Phosphine Oxide Moiety by Two Different Methods
The cultural heritage left by the Egyptian Pharaohs in the tombs of the Valley of the Kings represents some of the key elements of the Egyptian cultural and tourism wealth and standing monuments demonstrating the wealth and technology of the pharaohs. These tombs were prepared to bury the Kings` mummies and artifacts for eternal life. Many of the wall paintings identifying the various ancient rituals and life style are in good conditions as the tombs were only recently opened to the public and resulted, in many instances, to dramatic deterioration of the wall paintings due in part to excessive humidity. Basically, ventilation air design systems are considered here for the tomb passage of King Ramses VII, Ramses IV, Siti II and Bay including different visitors (obstacles) alternative positioning to adequately predict the actual air flow, thermal and moisture patterns in the tombs and hence to provide energy efficient design of ventilation system and reduce the adverse effect of excessive humidity. The present work made use of packaged Computational Fluid Dynamics (CFD) programs. For the present work, following similar work of Abdel Aziz et al  and Khalil , a numerical study is carried out to define the optimum airside design of the tombs air ventilation and conditioning systems, which provides the optimum comfort and healthy conditions with optimum energy utilization. Basically, airside design types are considered here for the tomb passage of King Ramses VII, Ramses IV, Siti II and Bay, including different visitors (obstacles) alternative positioning to introduce the capability of the design to provide the optimum characteristics. The primary objective of the present work is to assess the airflow characteristics, thermal pattern and moisture distribution in the different tombs ventilation configurations in view of basic known flow characteristics. Tombs consist, typically of three gently sloping corridors. The free air supply and mechanically extracted ducted air play an important role in shaping the main flow pattern where the internal obstacles can distort the airflow pattern by increasing the recirculation zones or by deflecting the main airflow pattern, [3 and 4].
Concurrent Penile Prosthesis and Artificial Urinary Sphincter versus Penile Prosthesis and Male Sling: A National Multi-Institutional Analysis of National Surgical Quality Improvement Program Database Comparing Pos
Khalil,Mahmoud,I.,Bramwell,Austin,K.,Bhandari,Naleen,Raj,Payakachat,Nalin,Machado,Bruno,Davis,Rodney,Kamel,Mohamed,H.,Safaan,Ahmed,Raheem,Omer,A. 대한남성과학회 2021 The World Journal of Men's Health Vol.39 No.1
Purpose: We aimed to assess the 30-day morbidity in patients undergoing combined insertion of penile prosthesis (PP) and artificial urinary sphincter (AUS) vs. PP and male sling (MS). Materials and Methods: The National Surgical Quality Improvement Program database was queried to identify patients who underwent placement of AUS or MS combined with PP. Patient demographics, postoperative morbidity including complications, readmission and reoperation rates were recorded. Student t-test and chi-square or Fischer's exact test were used as appropriate. Results: Forty-one patients met selection criteria between 2010 and 2016. Overall, 26 patients received PP and AUS vs. 15 that received PP and MS. Average age was similar in both groups (64.8±6.6 years vs. 62.3±6.3 years, p=0.254). Diabetes mellitus was more prevalent in PP+MS group compared to AUS+PP group (46.7% vs. 11.5%, p=0.022). Average length of stay was higher in PP+AUS group compared to PP+MS group (2.2±0.6 days vs. 1.8±0.4 days, p=0.017). Postoperative morbidity was reported in four patients in PP+AUS group. No reported complications in PP+MS group. In PP+AUS group, complications included one patient who developed urinary tract infection, one developed surgical site infection, readmission in two for postoperative infection, and one return to the operating room. No reported prosthesis explantation or revision in either groups. Conclusions: Our results showed that 30-day morbidity was recorded in the PP+AUS group and none in the PP+MS group. The complication and readmission rates remain comparable to the previous reports in both groups.