Adaptive Relay-Selection In Decode-And-Forward Cooperative Systems

In the past few years adaptive decode-and-forward cooperative diversity systems have been studied intensively in literature. Many schemes and protocols have been proposed to enhance the performance of the cooperative systems while trying to alleviate its drawbacks. One of the recent schemes that had been shown to give high improvements in performance is the best-relay selection scheme. In the best-relay selection scheme only one relaying nodes among the relays available in the system is selected to forward the source\u27s message to the destination. The best relay is selected as the relay node that can achieve the highest end-to-end signal-to-noise ratio (snr) at the destination node. Performance improvements have been reported as compared to regular fixed decode-and-forward relaying in which all relays are required to forward the source\u27s message to the destination in terms of spectral efficiency and diversity order. In this thesis, we use simulations to show the improvement in the outage performance of the best-relay selection scheme

Numerical assessment of the overall heat transfer and pressure drop performances of an aqueous ammonia base-nanofluids in rectangular microchannel heat sinks

In this paper, the thermal and hydrodynamic performances of an aqueous ammonia base-nanofluid (Al2O3-NH3(aqu)) cooled in a rectangular microchannel heat sink was numerically investigated. The range of Reynolds number used in the investigation were between 140-1400. In order to assess the performance of the system during the employment of the proposed nanofluid, H2O and Al2O3-H2O were also tested and their performances were compared to Al2O3-NH3(aqu) performance in terms of thermal resistance and pressure drop. Results from the simulation showed that the proposed nanofluid outperformed pure water and slightly higher than Al2O3-H2O in terms of thermal resistance (for Re = 1400, 0.0474, 0.0449 and 0.04647 oK/W for H2O, Al2O3-H2O and Al2O3-NH3(aqu), respectively). However, it exceeds the performance of both pure water and Al2O3-H2O in terms of pressure drop (for Re = 1400, 785288, 911217, 753591 Pa for H2O, Al2O3-H2O and Al2O3-NH3(aqu), respectively). The key findings from the current study may be used to attract more research about the proposed nanofluid to be used in the cooling process of microchannel heat sinks

Morphology control on porous monoliths and silica microspheres and applications in chromatography

archiv

Hierarchical porous metal-organic framework monoliths

Hierarchical porous crystalline metal-organic framework (MOF) monoliths are prepared by powder-packing synthesis. The resulting MOF monolithic column shows fast and efficient chromatographic separation

Study of anemia types in the blood parameters among children of Baqubah city

Background: Anemia is the most common condition in blood diseases, is caused by              a decrease in hemoglobin concentration on normal level . Objective:To the increased prevalence of anemia among children and women and The Purpose of recognize the types of anemia among children in Ba'qubah and How to diagnose and reduce the prevalence of anemia among children. Patients and Methods: This study was conducted in the Al-Batoul pediatric Hospital of Diyala Health Department for the duration of the first of October and ends on the 31st of December of the year 2016 , which collect 383 ( 212 male 55% , 171 female 45% ) blood samples of children sick Anemic ( Hemoglobin levels less than 11.0 g/DL) with age range between 1-15 years , with 2.5 cm 3 venous blood into a tube containing (EDTA) Ethylene diamine tetra acetic acid for blood picture, adopting the mean corpuscular volume (MCV) in classification anemia MCV 100 fl, as a bloody tinge to help with microscopy . Results: The results of the current study showed that most anemic patients samples was of mean corpuscular volume for less 80fl, represented by iron deficiency anemia by 45.69% and Thalassemia by 38.12% . While the mean corpuscular volume range between MCV = 80-100 fl ratio 13.05% spread on the sickle by 4.96% and Spherocytosis anemia by 8.09 %, while the mean corpuscular volume for more than 100 fl at ratio low 3.13% and represented by vitamin B12 anemia, which showed the latter strongest decrease in numbers of red blood cells and hemoglobin level, And this decrease in numbers of red blood cells and hemoglobin level was strongest in the Thalassemia and sickle cell anemia, compared by iron deficiency anemia, and Spherocytosis anemia , while decrease mean corpuscular hemoglobin in iron deficiency anemia and Thalassemia and increase in  Vitamin B12 deficiency anemia. As the study indicated that the numbers of white blood cells exceeded the normal in patients with Thalassemia and vitamin B12 deficiency anemia . Conclusion:The present study concludes that there is strongest decrease in numbers of red blood cells and hemoglobin in patients with hemolytic anemia and lack vitamin B12 with very high numbers of white blood cells

Aligned macroporous monoliths with intrinsic microporosity via a frozen-solvent-templating approachd

Aligned macroporous monoliths of an organic cage, a polymer of intrinsic microporosity (PIM-1), and a metal–organic framework (HKUST-1) are prepared by a controlled freezing approach. In addition to macropores, all the monoliths contain the intrinsic micropores.</p

Effect of a proposal of exercises on the development of basic motor abilities in men's artistic gymnastics

The purpose of this study was to recognize the effect of the proposed exercises in developing the particular motor abilities employed in the study as well as some ground skills in men's artistic gymnastics. This study used the experimental method and included 14 players of the directorate of Anbar Education team in the technical gymnastics for men (junior category), aged 10-12 years. The proposed exercises were then performed, which included 30 training units over a ten-week period, three training units each week, and forty minutes of training per unit. The researchers used the Statistical Package for the Social Sciences (SPSS) for data analysis. The results of our study showed that there were statistically significant differences in the results of the pre- and post-tests in all variables of the elements of special motor abilities and ground skills of the research sample, in favor of the post-test (p &lt; 0.05). The use of the proposed exercises had a positive effect in developing some special motor skills, and the development of special motor abilities contributed to the development of ground skills in the artistic gymnastics for men

Fahmy's four quadrant sutures: a new technique for control of blood loss during cesarean delivery for placenta previa

Background: The objective of this study is to assess the efficacy and safety of Fahmy's four quadrant suture technique (FFQS) in controlling blood loss during cesarean delivery for placenta previa (PP).Methods: The study was carried out in a tertiary University Hospital between January 2017 to December 2017 involved 12 women with heavy bleeding occurred after removal of the placenta from the lower section during cesarean delivery for PP. The FFQS technique consisted of two sutures to ligate the uterine branches on both sides and two sutures on the anterior and posterior wall of the lower uterine segment. Details regarding the management and maternal outcomes were recorded.Results: The mean age of the study participants was 29.58±5.29 years and the mean parity was 2.25±1.14. The mean gestational age at termination of pregnancy was 36.91±1.38 weeks.  The mean duration of the whole surgery was 78.75±43.28 minutes, while the mean duration of FFQS technique was only 10±2.09 minutes. The technique was exclusively effective in 8 out of 12 cases (66.67%) while 2 cases needed bilateral internal iliac artery ligation and 2 cases needed hysterectomy. The mean amount of blood loss in all cases was 2433.33±833.76 ml. the mean amount of transfused packed RBCs was 3.92±1.68 units and fresh frozen plasma (FFP) was 3.42±1.44 units. All cases had uneventful postoperative course and no mortality cases in present series.Conclusions: The new technique; FFQS represents a rapid, effective, and inexpensive opportunity for women with bleeding from the lower segment of uterus due to PP. This simple procedure should be attempted before other complex measures to achieve good hemostasis

Evaluation of hydrocortisone, vitamin c, and thiamine for the treatment of septic shock: a randomized controlled trial (the HYVITS trial)

Purpose: The aim of the study is to evaluate the effect of combined hydrocortisone, vitamin C, and thiamine (triple therapy) on the mortality of patients with septic shock. Methods: This multicenter, open-label, two-arm parallel-group, randomized controlled trial was conducted in four intensive care units in Qatar. Adult patients diagnosed with septic shock requiring norepinephrine at a rate of ≥0.1 μg/kg/min for ≥6 h were randomized to a triple therapy group or a control group. The primary outcome was in-hospital mortality at 60 days or at discharge, whichever occurred first. Secondary outcomes included time to death, change in Sequential Organ Failure Assessment (SOFA) score at 72 h of randomization, intensive care unit length of stay, hospital length of stay, and vasopressor duration. Results: A total of 106 patients (53 in each group) were enrolled in this study. The study was terminated early because of a lack of funding. The median baseline SOFA score was 10 (interquartile range, 8–12). The primary outcomes were similar between the two groups (triple therapy, 28.3% vs.control, 35.8%; P = 0.41). Vasopressor duration among the survivors was similar between the two groups (triple therapy, 50 h vs. control, 58 h; P = 0.44). Other secondary and safety endpoints were similar between the two groups. Conclusion:Triple therapy did not improve in-hospital mortality at 60 days in critically ill patients with septic shock or reduce the vasopressor duration or SOFA score at 72 h

The Role of Small Satellites in the Establishment of the Gulf Region\u27s First Graduate Level Space Studies Program

Yahsat, Northrop Grumman, and Khalifa University created the Gulf region\u27s first master\u27s level advanced studies space program. To date this program has graduated three classes of master\u27s students and received accolades from the UAE Space Agency and Abu Dhabi\u27s Mubadala Investment Company. The program\u27s primary goal is to develop the resources and work force that the UAE requires to establish itself as a space-faring nation. Integral to this program are small satellites, initially used to train and educate the students and ultimately growing to accommodate new technologies and scientific payloads developed in the UAE. The first of these small satellites, a 1U CubeSat named MYSat-1 was launched in November of 2018 and deployed from the Northrop Grumman Cygnus on 13 February, 2019. In this paper we present the role small satellites played in the establishment of this program. We discuss the challenges of establishing a satellite program at a university without a formal aerospace curriculum and how the small satellite became the anchor project for the student development. In this context, we explore the advantages of making use of the broadly established small satellite COTS component marketplace relative to the didactical benefits to be gained from having the students develop the new hardware in-house. Finally, we review the process of setting up a new small satellite lab established to be used as the primary resource for developing and testing small satellites in the country