2-Dimensional position error bias analysis of an angle of arrival based target locating system

An angle of arrival (AOA) based locating system determines the location of an emitting target using its emission detected at spatially deployed ground station (GS) with an angulation algorithm. The position estimation (PE) accuracy of the system depends on several factors one of which is the approach to the development of the angulation algorithm. For passive target locating, the closed-form angulation algorithm is used and has been known to introduce bias in the PE process. In this paper, a bias analysis of the closed-form angulation algorithm is carried out to determine its percentage in the overall position mean square error (MSE). The analysis is carried out using a three-GS triangular configuration at some randomly selected unmanned aerial vehicle (UAV) drone locations. Monte Carlo simulation result based on 200 realizations shows that the bias error introduced by the angulation algorithm in the overall position MSE is about 64%. With the knowledge of the bias percentage, the actual locations of the UAV drones within the AOA-based locating system coverage can be determined

Value Relevance of Accounting Information: Empirical Evidence from Listed Conglomerate Firms in Nigeria

In recent years, internal and external investors have lost confidence in Nigeria due to insecurity, energy (power), economic instability, and governance. Although the government is trying to overcome the menace, there are still unresolved issues in the aspect of the challenges above, which affect value relevance and accounting information in ensuring the perpetual existence of companies in Nigeria. As such, the study examined the value relevance of accounting information of listed conglomerate companies in Nigeria. The study population comprises six companies: UAC Nigeria Plc, Chellarams Plc, SCOA Nigeria Plc, John Holt Plc, Transnational Corporation of Nigeria Plc, and Custodian Investment Plc. The data was extracted from their annual report and accounts. Descriptive statistics correlation regression was conducted in the study. The result shows that return on share price has a significant negative relationship with dividend per share. The study recommends that standards comply in reporting and disclosing all accounting information in the published financial statement to maintain value relevance and attract more investors

A survey of opportunistic infections in HIV seropositive patients attending major hospitals of Kebbi state, Nigeria

A survey was conducted to determine the prevalence of HIV/AIDS related opportunistic infections from the patients attending the five major Hospitals in Kebbi State , which included Federal Medical Center (FMC), Birnin Kebbi, Sir Yahaya Memorial Hospital (SYMH), Birnin Kebbi, General Hospital, Argungu (GHA), General Hospital , Yauri (GHY) and General Hospital , Zuru (GHZ). The screening for the HIV/AID was done using the Genic II HIV-1/HIV – 2 Test and the screening for opportunistic infections was done using thin and thick blood films, direct wet mount, formal ether concentration technique and modified Ziehl – Neelsen (ZN) technique. Microbial Pathogens were isolated through culture and identified through gram staining and biochemical tests. Out of the 1950 patients screened for HIV/AIDS infection, 606 (31.6%) were positive. Higher prevalence 195 (32.2%) was from FMC and the lowest from GHY 90 (15%). The result revealed that 374 (61.7%) of HIV/AIDS positive patients were also positive to one or more opportunistic infections. In this respect, higher prevalence of 32.3% was observed from FMC and the lowest was observed from SYMH with 13.9%. The result of the study also revealed the presence of malarial (Plasmodium) parasites with prevalence of (75.9%).The Federal Medical Centre (FMC) had the highest prevalence of 29.5%, SYMH, 21.7%, GHA, 17.2%, GHY, 16.1 and lastly GHZ with 15.4%. There is therefore the need for urgent positive control programme of HIV and HIV related opportunistic infections. Keywords: Survey, opportunistic infections, HIV Sero positive, Kebbi State

Management of Unilateral Suppurative Mastitis in A Four-year-old Red

Nigerian Veterinary Journal, Vol. 32(3): 2011; 246 - 24

Load-ability Analysis during Contingency with Unified Power Flow Controller Using Grey Wolf Optimization Technique

Voltage stability enhancement with optimal placement of a unified power flow controller considering load-ability analysis is investigated in this paper. It is essential, because when voltage instability is left unattended, it leads to voltage collapse and, consequently, in a partial or total blackout of the whole network resulting from cascading effect. The optimization process is achieved by increasing the percentage load demand index to the maximum load-ability and under single contingency. This method will be of great benefits to bulk dispatcher of power to plan ahead of how to wheel and deliver power to the end-users during both normal and contingency conditions at the least cost and time. A grey wolf optimization technique is utilised to find the optimal location and sizing of UPFC on the network. The line’s voltage stability and load margin are then evaluated with and without UPFC under different loading conditions using optimal power flow technique. The approach’s effectiveness is carried out on 31-bus, 330kV Nigeria National Grid (NNG) based on two scenarios: load-ability analysis under maximum loading of the network and load-ability analysis under single contingency. The results show that power can be transmitted to meet the growing energy demand over an existing network during normal and contingency conditions without violating voltage stability by making use of the proposed method in this pape

GREY WOLF OPTIMIZER BASED OPTIMAL PLACEMENT OF MULTIPLE FACTS DEVICES IN THE TRANSMISSION SYSTEM UNDER DYNAMIC LOADING SYSTEM

The application of grey wolf optimization technique for multiple FACTS placement is presented in this paper for the reduction of total system losses and minimization of voltage deviation via optimal placement of Flexible AC Transmission System (FACTS) device. Grey wolf optimization (GWO) technique is inspired by social hierarchy and hunting behaviour of wolves and offers a right balance between exploration and exploitation during the search for global optimal. Series-shunt FACTS device; unified power flow controller (UPFC) is considered as a formidable device that can provides an alternative option for the flexible controllability and improvement of power transfer capability of a transmission lines. The analyses were conducted by increasing the number of UPFC in the network in order to evaluate the optimal number of FACTS devices that would give the least loss under maximum loading and contingency conditions. The efficacy of this proposed technique is demonstrated on 31-bus, 330 kV Nigeria National Grid (NNG) using MATLAB environment. The results show that optimal placement of FACTS device along with optimization technique provides a promising solution to the high power loss and voltage deviation bedevilling Nigeria National Grid

Epidemiology of COVID-19 and Predictors of Outcome in Nigeria: A Single-Center Study.

There is a paucity of information regarding the epidemiology and outcome of COVID-19 from low/middle-income countries, including from Nigeria. This single-center study described the clinical features, laboratory findings, and predictors of in-hospital mortality of COVID-19 patients. Patients admitted between April 10, 2020 and June 10, 2020 were included. Forty-five patients with a mean age of 43 (16) years, predominantly male (87%), presented with fever (38%), cough (29%), or dyspnea (24%). In-hospital mortality was 16%. The independent predictors of mortality were hypoxemia (adjusted odds ratio [aOR]: 2.5; 95% CI: 1.3-5.1) and creatinine \u3e 1.5 mg/dL (aOR: 4.3; 95% CI: 1.9-9.8)