Effective Capacity of Cognitive Radio Links: Accessing Primary Feedback Erroneously

We study the performance of a cognitive system modeled by one secondary and one primary link and operating under statistical quality of service (QoS) delay constraints. We analyze the effective capacity (EC) to quantify the secondary user (SU) performance under delay constraints. The SU intends to maximize the benefit of the feedback messages on the primary link to reduce SU interference for primary user (PU) and makes opportunistic use of the channel to transmit his packets. We assume that SU has erroneous access to feedback information of PU. We propose a three power level scheme and study the tradeoff between degradation in EC of SU and reliability of PU defined as the success rate of the transmitted packets. Our analysis shows that increase in error in feedback access causes more interference to PU and packet success rate decreases correspondingly.Comment: Accepted for publication in International Symposium on Wireless Communication Systems (ISWCS) 201

Study of the Effect of Geomembranes on the Interaction between the Soil and Underground Structures

Geomembranes are one of the most widely used insulation materials in various civil engineering applications. Failure due to the slippage between geomembranes and the interfacing soils was detected at some cases. This paper presents the results of a series of laboratory tests carried out to investigate the factors controlling the developed interface stresses strength between the soil and geomembranes. In order to quantify the effect of different commonly used isolation membranes on the behavior and stability of buried concrete structures, laboratory studies by using modified direct shear apparatus is performed and integrated and the reduction in the shear resistance between the soil and different types of isolation geomembranes is determined. Graded sand with well-rounded particles was used in the experimental program. Shear tests were conducted under a normal stress range of about 25-100 kPa. The effect of the geomembranes on the peak and residual interface shear strengths is highlighted. Test’s results indicate development of peak interface shear resistance at a small strain and constant residual interface shear resistance at large strain. It was found that the developed peak and residual interface friction angles between the sand and the geomembranes interfaces ranged from 59 % to 82 % of the corresponding peak and residual interface friction angles between sand and un-protected concrete

Invasive mole of the uterus: A description of two cases managed by hysterectomy

AbstractGestational trophoblastic disease (GTD) is a term used for a group of pregnancy-related tumors. Gestational trophoblastic neoplasia (GTN), is recognized as the most curable gynecologic malignancy. However, many cases are resistant to first line chemotherapy. We present cases of invasive mole. They were diagnosed as a vesicular mole on ultrasonography and underwent suction and evacuation but vaginal bleeding recurred with plateau and rising B-hcg with intramyometrial vascular lesion. Hysterectomy was done that indicated invasive mole. Patients were cured of their symptoms. Surgical therapy (hysterectomy) with chemotherapy has shown to achieve remission in these cases especially with resistance to chemotherapy and in perimenopause

NUMERICAL PREDICTION OF SOLITARY WAVE FORMATION OF A PLANING HULL IN SHALLOW WATER CHANNELS

This paper uses a CFD (Computational Fluid Dynamics) analysis to investigate the shallow water effects on prismatic planing hull. The turbulence flow around the hull was described by Reynolds Navier Stokes equations RANSE using the k-ɛ turbulence model. The free surface was modelled by the volume of fluid (VOF) method. The analysis was steady for all the range of speeds except those close to the critical speed range due to the propagation of the planing hull solitary waves at this range. In this study, the planing hull lift force, total resistance, and wave pattern for the range of subcritical speeds, critical speeds, and supercritical speeds have been calculated using CFD. The numerical results have been compared with experimental results. The pressure distribution on the planing hull and its wave pattern at critical speed in shallow water were compared with those in deep water

Bearing Capacity of Driven Open-Ended Pipe Piles in Weak Soil Formations

Steel pipe piles have been increasingly used as deep foundations for offshore or onshore structures in weak soil formations. These piles are usually open-ended and installed to their final level using suitable hammers or vibrators relying on the subsurface conditions. Simultaneously, the soil plug (SP) forms inside the employed pipe pile during driving or installation. Moreover, it affects bearing behavior and total pile resistance. The experimental tests have been performed on a single tube pile. All tube piles were tested using the well-graded sand collected from the Egyptian desert, and the sand was prepared at medium density using a raining technique. The outcomes of the model pile tests showed that the value of plug resistance in open-ended pipe pile (OEPP) is typically on the order of 50% to 70% of the total pile load of OEPP, and it is influenced by pile thickness, pile diameter, pile length, and submerged state. Simultaneously, the plugging influence of OEPP increased with increasing pile thickness and embedded pile length. However, the plugging influence decreased with increasing pile diameter. The total pile load of OEPP increased with increasing the embedded pile length. It must be noted that the influence of pile length on the total pile load is greater than the influence of pile diameter; this refers to the pile length having a significant effect on the total pile load. This is due to an increase in the influence of SP

A case of parasitic leiomyoma with serpentine omental blood vessels: An unusual variant of uterine leiomyoma

AbstractLeiomyoma is considered as the commonest benign tumor of the genital tract. This case represents a multiparous woman who presented with a history of progressive abdominal distension. On examination, a mobile ill-defined centrally located intra-abdominal mass was noticed. At laparotomy a parasitic fibroid attached to the greater omentum was seen. Resection of the mass and partial omentectomy was performed which was reported as leiomyoma by the histological examination. The patient had an uneventful post-operative recovery. She has been followed up for twelve months with no evidence of recurrence or residual disease

Effect of progressive prone plank exercise program on diastasis of rectus abdominis muscle in postpartum women: A randomized controlled trial

Diastasis of Rectus Abdominis (DRA) muscle is a concerning health issue that commonly affects female within pregnancy and postpartum time, persistent lower back pain and pelvic instability are common consequences to DRA. Thus, this study was conducted to examine the effect of progressive prone plank exercises on narrowing the inter-Rectus distance (IRD) in postpartum women diagnosed with (DRA). A prospective, randomized, single-blind, controlled trial was conducted at the Faculty of Physical Therapy Clinic of Beni-Suef University. Fifty postpartum women presented with (DRA) of at least 2 finger widths assigned into 2 equal groups (A&B). A Toshiba Xario100, 8–12 MHz ultrasonography was used to accurately measure IRD before and after 8 weeks of the exercise program. Group (A), received progressive prone plank exercise program and advice relevant to DRA as well as wore abdominal binder, while group (B) continued their ordinary lifestyle after receiving advice and wearing abdominal binder as group (A).The study results revealed a statistical significant decrease within each group and between groups in IRD (p < .05) above and below the umbilicus both at rest and during Rectus Abdominis (RA) contraction, with a significantly narrower IRD in favoured of participants of group (A) (p < .05). To sum it up, progressive prone plank exercise program is very effective in decreasing IRD in postpartum women presented with DRA