Interference Management for the Coexistence of DTTV and LTE Systems within the Proposed Digital Dividend Band in Nigeria

This paper seeks to present the Interference Management for the Coexistence of DTTV and LTE Systems within the proposed digital dividend band in Nigeria. The study focused on LTE Down-link (DL) signal from the nearest cell site interfering with the Digital Terrestrial Television (DTTV) fixed outdoor receiving antenna in Port Harcourt, Nigeria. The qualitative signal analysis of the DTTV systems is essential as DTTV system cannot start to operate in the newly formed frequency band without the evaluation of the possible harmful influence of the coexisting systems. This research work investigated the Compatibility of the two systems and the Probability of interference of Channel 17 (490MHz) and Channel 51 (693MHz) when DTTV and LTE systems coexist within the proposed Digital Dividend band. A test-bed approach method was adopted for the generation of the required simulation data. Star Time transmitting Station in Port Harcourt and Smile LTE 4G Communication LTE Base Station (eNBs) Network also in Port Harcourt were adopted as the Victim Link Transmitter (VLT) and Interfering Link Transmitter (ILT) respectively. Data was obtained, analyzed, and evaluated. It was observed from the simulation result that the probability of interference is a function of the separation distance between ILT and VLR. The Compatibility analysis result shows that the resulting C/I is above the protection criteria (19dB), that is there’s a minimal rate of interference. Hence, the interference issue can be managed when the two systems coexist in700MHz band. It was also established that DTTV channel 51 suffers more interference when compared with DTTV channel 17 for the same separation distance. The study recommended the minimum protection distance approach (Interference Avoidance method) as the interference management techniques when DTTV and LTE systems coexist in the proposed digital dividend (700MHz) band in Nigeria.

Sulfidation-Oxidation Resistance of Thermal Diffusion Multi-Layered Coatings on Steels

The high-temperature sulfidation-oxidation corrosion resistance of protective coatings deposited on carbon and 316L steels was studied. The coatings obtained via the thermal diffusion process had multi-layered architectures and consisted of aluminides, iron borides, or iron boride–TiO2 layers. The protective coatings experienced a minimal rate of mass changes, insignificant scale formation, and no delamination and surface micro-cracking after 504 h of exposure in 1% (Vol.) H2S-air atmosphere at 500 °C. Furthermore, the coatings demonstrated a high degree of integrity compared to bare 316L stainless steel. Aluminized steels demonstrated the highest performance among the studied materials. The developed thermal diffusion coatings are promising candidates due to their enhanced stability in H2S–air atmosphere; they may be employed for protection of inner and outer surfaces of long tubing and complex shape components.

1302 Ratio of Adenoma Detection Rate to Polyp Detection Rate

Introduction Colorectal cancer is the 3rd most common cancer in the UK. The higher Adenoma Detection Rate during colonoscopy is associated with reduction in the mortality incidence of colorectal cancer. Endoscopists with less than 20% ADR is directly proportional to higher risk of the development of an interval Colorectal cancer. The aim of this study was to calculate the Adenoma Detection Rate and Polyp Detection Rate for each endoscopist to assess the performance of the unit as well as individuals. Method A retrospective analysis was conducted for patients who had colonoscopy in a period of 3 consecutive months at a primary care hospital in England. This study included collecting the data through patient’s histology reports and medical records. The primary outcome was total Adenoma Detection Rate and Polyp Detection Rate and its ratio for each endoscopist. Results 913 colonoscopies were done by 16 different endoscopists out of which 279 patients with polyps were considered for the study. It was observed that half of the total endoscopists were found to have ADR more than 20%. 4 endoscopists had ADR between 15-20% whereas below minimal rate (less than 15%) ADR was recorded by the other 4 endoscopists. Conclusions Lower ADRs are associated with higher rates of interval cancers. An improvement of the ADR of 1% prevents 3% people from colon cancer which can be achieved by maintaining the aspirational adenoma detection rate more than 20%.

The Influence of Perioperative Antibiotic Prophylaxis on Wound Infection and on the Colonization of Wound Drains in Patients After Correction of Craniosynostosis

Objective: Evidence for the duration of perioperative antibiotic prophylaxis (PAP) after the correction of craniosynostosis in children is scarce. We evaluated the necessary duration of PAP to ensure a minimal rate of postoperative wound infections.Methods: In this monocentric, retrospective, and prospective pilot study, two PAP protocols were compared. From August 2017 to May 2018, treatment group 1 (TG 1) was treated using the standard PAP protocol with at least three doses of antibiotics. Between May 2018 and March 2019, a shortened PAP with a single-shot administration was given to treatment group 2 (TG 2a and b). Endpoints of this study were wound infection rate, colonization rate of wound drains, and the course of treatment reflected by clinical and laboratory data.Results: A cohort of 187 children underwent craniosynostosis correction: 167 were treated according to protocols-−95 patients with at least three doses (TG 1) and 72 patients with a single-shot of cefuroxime (TG 2a). Baseline characteristics were similar for both groups. We could not detect significant differences, neither for wound infection rates (TG 1: 1.1%, TG 2a: 0.0%, p = 0.38) nor for colonization rates of wound drains (TG 1: 4.8%, TG 2a: 10.5%, p = 0.27).Conclusions: Single-shot PAP had no adverse effects on the wound infection rate or the colonization rate of the wound drains compared with prolonged perioperative antibiotic prophylaxis. As a result, single-shot preoperative PAP is now applied to the majority craniosynostosis patients undergoing surgical correction in our unit.

Intravascular Ultrasound Assessment and Correlation With Angiographic Findings of Arterial Dissections Following Auryon Laser Atherectomy and Adjunctive Balloon Angioplasty: Results of the iDissection Auryon Laser Study

Background Femoropopliteal arterial angiographic dissections with the use of the Auryon laser atherectomy system (previously the B-laser) have been infrequent and non–flow limiting. However, the pattern of these dissections (depth and arc) using intravascular ultrasound remains unknown. Materials and Methods We prospectively enrolled 29 patients in the iDissection Auryon study. The primary objective was to define the occurrence of new adventitial injury with intravascular ultrasound (IVUS). Secondary objectives included distal embolization and bailout stenting as judged by the operator because of 30% or more residual narrowing and/or NHLBI (National Heart, Lung, and Blood Institute) angiographic dissection C and higher. Core laboratory analysis was carried on all cases except for 1 patient (that crossed over to Jetstream atherectomy). Dissections were classified according to the iDissection classification as involving the intima (A), media (B), and adventitia (C) and ≤ 180-° arc (1) or >180-° arc (2). Overall, 22 of 29 patients had an embolic filter (per protocol). Results Median lesion and treated lengths were 100.0 and 150.0 mm, respectively. Vessel diameter by IVUS was 6.5 ± 1.5 mm. Chronic total occlusion (CTO) was present in 24.1% of cases. The arc of calcium was: no calcium in 27.6%, <90° in 13.8%, 90° to 180° in 20.7%, and >180° in 34.4%. Lesion severity was reduced to a median of 14% post laser and adjunctive percutaneous transluminal angioplasty (PTA) from a baseline of 76%. Bailout stenting occurred in 6 of 28 (21.4%) patients (3 for dissections, 2 for residual >30%, and 1 for both) and primary stenting in 1 of 28 (3.6%). By IVUS, there were 9 new dissections post laser (1 adventitial; 3≥180°) and 21 new dissections post laser and PTA (3 adventitial; 1≥180°). No distal embolization requiring treatment was seen and no macrodebris ≥2 mm was recovered in the filters. Conclusion The Auryon laser atherectomy system had minimal rate of adventitial injury despite complex disease with relatively low bailout stent rate and no clinically significant macrodebris.

Land use and occupation in the Fundaça Stream subbasin, Espírito Santo, Brazil

The objective of the research was to evaluate land use and occupation in the Fundaça Stream subbasin, state of Espírito Santo, Brazil, aiming at subsidizing improvements in environmental conservation and territorial planning. The procedures were performed in the ArcGIS® computer program. First, the study defined the limits of the subbasin, and then obtained the features of land use and occupation for the state of Espírito Santo from two mappings, from 2007 to 2008, and from 2012 to 2015. These features were edited, defining the classes of use and occupation only for the subbasin. They were identified, quantified, and mapped. There is a predominance of pasture, with percentages above 50 %, although this occupation decreased by 1.94 % between the periods studied. Coffee growing, the third predominant class, also decreased, which can be attributed to the preference for other activities, such as eucalyptus forestry. This showed strong growth, although with even lower percentages. Mishandling of those areas can cause environmental and economic damage. However, the areas of native vegetation represented a minimal rate, even with an increase, due to the decrease of vegetation in the early stage of regeneration. Macega (wild vegetation) coverage, besides being close to the native vegetation and which was predominantly fragmented, indicates problems with the use and occupation planning. The action of the local riverbasin committee and public managers, besides environmental education, and correct management of rural activities, are necessary actions.

Role of the Uterine Artery Ligation (UAL) In Control of Postpartum Hemorrhage

Objective: To determine the efficacy and safety of uterine artery ligation (UAL) in control of Postpartum Hemorrhage. Methodology: This case series study was conducted at Department of Gynecology and Obstetrics Peoples University of Medical & Health Sciences for Women Nawabshah. All the women age between 20-45 years, gestation duration at and beyond 34 weeks, antepartum hemorrhage; intraoperative atonic postpartum hemorrhage and discovery of a placenta accreta; or an adherent placental part after piecemeal removal of the placenta, with bleeding from the placental site were included. After failure of treatment from medical measures, the initial surgical approach of uterine artery ligation (UAL) was done. Efficacy was defined as positive when patient improves or clinically doesn’t develop any complication throughout admission after UAL. Safety was assessed by appearance of side effects if any occurred after procedure. Data was recorded via study proforma and analysis was done by using SPSS version 20. Results: Out of 76 patients admitted of postpartum hemorrhage mean age was 58 years. Most of the patients 59.2% were multiparous and 40.8% were primiparous. The most common cause of postpartum hemorrhage was uterine atony 56.5% and adherent Placenta accreta 43.42%. Most of the patients 81.6% had no postoperative complications except for 11 patients, who had developed gaping of the wound from which they recovered and discharged. The patients required hysterectomy due to intractable hemorrhage and 2.3% mortality was observed due to DIC. Conclusion: Uterine devascularization by bilateral uterine artery ligation is a simple, effective and the safest initial surgical option with less blood loss and less surgical time for controlling postpartum hemorrhage during cesarean section. It should be used as the first surgical step of choice after medical managements fail in controlling postpartum hemorrhage due to minimal rate of complications and mortality.

Sustaining a temperature difference

We derive an expression for the minimal rate of entropy that sustains two reservoirs at different temperatures T_0T0 and T_\ellTℓ. The law displays an intuitive \ell^{-1}ℓ−1 dependency on the relative distance and a characterisic \log^2 (T_\ell/T_0)log2(Tℓ/T0) dependency on the boundary temperatures. First we give a back-of-envelope argument based on the Fourier Law (FL) of conduction, showing that the least-dissipation profile is exponential. Then we revisit a model of a chain of oscillators, each coupled to a heat reservoir. In the limit of large damping we reobtain the exponential and squared-log behaviors, providing a self-consistent derivation of the FL. For small damping “equipartition frustration” leads to a well-known ballistic behaviour, whose incompatibility with the FL posed a long-time challenge.

Regressive Whale Optimization for Workflow Scheduling in Cloud Computing

Cloud computing is the advancing technology that aims at providing services to the customers with the available resources in the cloud environment. When the multiple users request service from the cloud server, there is a need of the proper scheduling of the resources to attain good customer satisfaction. Therefore, this paper proposes the Regressive Whale Optimization (RWO) algorithm for workflow scheduling in the cloud computing environment. RWO is the meta-heuristic algorithm, which schedules the task depending on a fitness function. Here, the fitness function is defined based on three major constraints, such as resource utilization, energy, and the Quality of Service (QoS). Therefore, the proposed task scheduling requires minimum time and cost for executing the task in the virtual machines. The performance of the proposed method is analyzed using the four experimental setups, and the results of the analysis prove that the proposed multi-objective task scheduling method performs well than the existing methods. The evaluation metrics considered for analyzing the performance of the proposed workflow scheduling method are resource utilization, energy, cost, and time. Resource utilization is the process of making the most of the resources available for performing tasks. Energy is the quantitative property of the resource to perform tasks. The proposed method attains the maximum resource utilization at a rate of 0.0334, minimal rate of energy, scheduling cost, and time as 0.2291, 0.0181, and 0.0007, respectively.

Suction diathermy adenoidectomy: audit of current practice in a tertiary care hospital

<p class="abstract"><strong>Background:</strong> Adenoidectomy is conventionally performed using adenoid curette as a blind procedure. Suction diathermy adenoidectomy is a technique of ablating the adenoid tissue using thermal energy and removing it by suction. This audit aims to study the efficacy and complications of this technique in a tertiary care center.</p><p class="abstract"><strong>Methods:</strong> Retrospective analysis of hospital database was conducted. Twenty-seven patients who underwent suction diathermy adenoidectomy were identified and hospital records studied. Parents were contacted and enquired regarding improvement in child's symptoms.</p><p class="abstract"><strong>Results:</strong> No instances of postoperative complications identified. All except 2 parents were completely satisfied with the improvement in their child's symptoms. Two children had occasional mouth breathing.</p><p class="Standard"><strong>Conclusions:</strong> Suction diathermy adenoidectomy is a feasible alternative to conventional adenoidectomy with few complications and minimal rate of recurrence.</p>