ALGORITHMIZATION, REQUIREMENTS ANALYSIS AND ARCHITECTURAL CHALLENGES OF TRACONDA

Globally, there are so much information security threats on Internet that even when data is encrypted, there is no guarantee that copy would not be available to third-party, and eventually be decrypted. Thus, trusted routing mechanism that inhibits availability of (encrypted or not) data being transferred to third-party is proposed in this paper. Algorithmization, requirements analysis and architectural challenges for its development are presented

COST-EFFECTIVE RASPBERRY PI BASED SURVEILLANCE SYSTEM USING INNOVATIVE TECHNOLOGY

Home security is paramount. Criminals break into houses and cart away valuables and sometimes injure/kill the property owners. Though the existing home security system is effective however it is not affordable to the majority. Thus, due to the high cost of CCTV or IP camera systems alike, there is a need to develop a cost-effective surveillance system using innovative technology. This study develops and builds a prototype of a low-cost security system based on Raspberry Pi microcomputer. The Raspberry Pi will interface with Pi camera without interfacing the device with a PIR sensor, remotely send an email to a prescribed mail hub and also send SMS alert to the facility owner and or security agency

OPTICAL DISPERSION COMPENSATION USING DIFFERENT MODULATION FORMATS

Optical dispersion is the main impediment to optimal utilization of optical fiber backbone ability to satisfy the capacity need of today’s emerging telecommunication networks. In this paper, the investigation of post - and symmetrical dispersion compensation fibers (DCF) have been examined in a 16 and 32 channel 40Gbps dense wavelength division multiplexing (DWDM) system using different modulation formats. Simulation results obtained show a significant improvement in the quality factor and bit error rate when DCF is used. The performance of the methods however shows dependency on the number of channels in the system, the modulation, and the channel condition

MODELLING OF GROUND LEVEL CONCENTRATION OF PARTICULATE MATTER IN MAJOR NIGERIAN UNIVERSITY AIRSHED

Modelling of air pollutants for air quality assessment has been an important landmark achievement by environmentalists especially in areas where on-the-field monitoring is not economical. Models have proven to be cost-efficient and predicts better with different sample sizes. The objective of this study was to model the particulate matter pollutants of a major Nigerian university airshed and to compare of the predicted results with regulatory standards. Dispersion modelling analysis using for line and point sources study of the university airshed was carried out. Prior to the use of the modelling tool, vehicular counts, emission estimation and loads for the two pollution sources was done. The predictions revealed that concentration levels of PMs to emission source and receptor environments for the line source study were extremely high due to factors such as emission height and meteorological conditions of the university. The predicted concentrations from the point source were moderate and the reason is due to the emission height (stack height), wind speed and direction. Other contributing sources could be as a result of biomass burning, bush burning and pollutant transport. This study will be a bedrock for institutional-based air quality assessment that checkmate the anthropogenic contribution to deteriorating ambien

Methyl orange, an organic dye: its health impact and sorptive removal from waste water

AbstractMethyl Orange (MO) a member of Azo dyes are commonly used as synthetic dyes in textile, food, paper and cosmetics. Their use is easy and cost-effective, compared with natural dyes. However, azo bonds are hardly removed because of their high water solubility as well as low exhaustion with the potential for persistence and accumulation in the environment, therefore aqueous solution of MO is toxic and irritating. Thus, the removal of them from industrial wastewaters is capital with regard to protect public health, environment, and aquatic life

Essential oils from the leaves of six medicinal plants of Nigeria.

The chemistry of Cassia siamea L., C. occidentalis L. (Fabaceae), Cnestis ferruginea Vahl ex DC (Connaraceae), Anthocleista djalonensis A. Chev (Loganiaceae), Solanum torvum Swartz and S. erianthum G. Don (Solanaceae) volatiles grown in Nigeria have been studied. The essential oils were obtained by hydrodistillation and analyzed by GC and GC-MS. The main compounds of C. siamea were (E)-geranyl acetone (5.8%), 1-octen-3-ol (5.8%), linalool (7.8%), iso-italicene (15.4%) and (E)-β-damascenone (11.0%). On the other hand, C. occidentalis consisted mainly of (E)-geranyl acetone (8.0%), hexahydrofarnesylacetone (24.0%) and (E)-phytol acetate (40.7%). The oil of C. ferruginea was comprised mainly of (E)-geranyl acetone (13.7%), (E)-α-ionone (9.5%), phytol (5.8%), pentadecanal (6.1%) and 1-octen-3-ol (5.5%). The main compounds of A. djalonensis were α-humulene (31.9%), β-caryophyllene (17.8%), humulene epoxide II (12.7%) and caryophyllene oxide (5.9%). The main volatiles of S. torvum were (E)-phytol acetate (38.7%), pentadecanal (25.3%) and (E)-geranyl acetone (5.0%). Apart from methyl salicylate (4.5%), tetradecanal (2.2%), 2-pentyl furan (1.8%), hexahydrofarnesylacetone (1.6%) and hexadecanal (1.1%), all other compounds were either present in trace quantity or in amounts less than 1%. On the other hand, α-humulene (46.6%) and β-caryophyllene (20.6%) were the compounds occurring in higher quantities in S. erianthum. The volatile oil contents of Cassia siamea, Cnestis ferruginea, Anthocleista djalonensis and Solanum torvum are being reported for the first time

Evaluation of Phytochemical Constituents of Fresh Roots Aqueous and Ethanolic Extracts of the Medicinal Plants of Uvaria chamae, Anthocleista djalonensis and Euadenia eminens

Phytochemicals are bioactive plant chemicals nutrients typically found in fruits, vegetables, grains, and other plant foods which may provide desirable health benefits beyond basic nutrition and can help reduce risks of major chronic diseases. This study was conducted to evaluate the phytochemical constituents of fresh roots ethanolic and aqueous extracts of medicinal plants of Uvaria chamae, Anthocleista djalonensis and Euadenia eminens using standard methods of phytochemical screening and Gas Chromatography - Mass Spectrometry (GC-MS) analysis. Phytochemical screening revealed a diverse array of phytochemical constituents such as alkaloids, flavonoids, phenols, tannins, saponins, isoprenoids, steroids, phlobatanins and cardiac glycosides. The results of GC-MS analysis of aqueous and ethanolic extracts of U. chamae revealed the presence of four and fourteen compounds respectively. Aqueous and ethanolic extracts of A. djalonensis had ten and seventeen compounds respectively while the aqueous and ethanolic extracts of E. eminens was found to have six and twenty compounds respectively.  These results indicate U. chamae, A. djalonensis and E. eminens possess phytochemicals which have potential antioxidant, antidiabetic, anticancer, anti-inflammatory activity amongst others and as such, can be recommended as plants of phytopharmaceutical importance

The Relative Quantification of Hedgehog Signalling Components of Hepatocellular Carcinoma (Hepg-2) Cells Treated With Sorghum bicolor Leaf Stalk Ethanolic Extract

Hepatocellular carcinoma (HCC) is the most frequent type of primary liver cancer. Patients with advanced HCC have a dismal prognosis due to the limited therapy choices available. Hence, this present study evaluates the cytotoxic potential of the ethanolic crude extract of Sorghum bicolor leaf stalk (SBELSE) against human hepatocellular carcinoma (HEPG2) cell line, and its effect in the expression of its Hh signaling component-GLI1 and PTCH. The leaf stalk of Sorghum bicolor (SB) was pulverized and extracted with 70% ethanol. HEPG2 cells were treated with different concentration of ethanol extract of SBELSE which was subjected to 2-fold serial dilution to achieve a graded concentration (9.77-5000 µg/ml). Cell viability was performed using CCK-8 assay. The cells were treated with 8 µg/mL and 23 µg/mL concentration of SBELSE for 48 hour, after which RNA was isolated for downstream gene expression studies using RT-qPCR. The expression level of GLI1 and PTCH genes in cell line was examined relative to the untreated group. SBELSE exerted a cytotoxic effect on HEPG-2 cells with an inhibitory concentration (IC50) of 150 µg/mL. After 48 hours of treatment and evaluation, Expression of GLI1 and PTCH genes was seen in all cell group but was increased in groups treated with 8µg/mL concentration of S. bicolor extract than in the control group.  The findings of this study suggest the possibility of the extract to contain agonistic component that might support cancer cell proliferation

Use of search engines for research by postgraduate students of the university of Ibadan, Nigeria

No Abstract. African Journal of Library Archives and Information Science Vol. 17 (2) 2007: pp. 103-11

The Development of Mathematics E-Learning Tool for Nigerian Senior Secondary Schools

Electronic learning (E-learning) involves the use of information and communications technology (ICT) tools and systems in teaching and learning processes. Such tools are being rapidly deployed into the Nigerian higher educational system because of their pedagogical benefits. But there have been inadequate efforts to deploy such tools at the secondary schools in the country, where spectres of overpopulated classrooms and escalating student-to-teacher ratios have contributed to the poor performances of students in the Senior Secondary School Certificate examinations, especially in mathematics. Towards contributing to the local Nigerian efforts in the development and utilisation of e-learning tools in Nigerian secondary schools, this research undertook the development of an e-learning application (EMaths) to support the teaching and learning of some aspects of the mathematics syllabus of the West African Examinations Council. A survey of students in selected secondary schools had revealed that mathematics was the most challenging to learn. The research found out and recommended that, in view of the very limited networked and Internet-connected ICT infrastructure available to most Nigerian secondary schools at present, the application would be most useful in hybrid learning environments that combine face-to-face classroom instruction delivery with the application, using CD-ROM as the delivery medium