RESOLUTION OF SEISMIC INTERPRETATION ANOMALIES THROUGH THE SPECTRAL RATIO TIME DEPENDENT METHOD.

Interpretation of seismic results from a complex geological formation can be very difficult both on-field and off-field. The spectra ratio (SR) time-dependent method was derived using established geological principles. The spectral amplitude was analyzed numerically to affirm the reliability of the method on field operations. It was observed that the SR time-dependent method could initiate a natural correction to the attenuated seismic amplitude at each given interval during a seismic operation. The multi-layer implementation of the adopted method showed great success with the most accurate result at n = 0.1 for the fourth term on a newly-propounded volumetric table. Most volumetric results from the Niger- Delta showed correspondence with the volumetric analysis of the fourth term. One of the on-field volumetric results was obtained in the third term. The derivation of the volumetric table is to further enhance more accurate exploration using the reflective seismic technique

Unusual complication of ventriculoperitoneal shunt

Ventriculoperitoneal shunt (VPS) is the conventional method of managing hydrocephalus until recently that endoscopic third ventriculostomy is becoming popular. The major disadvantage of VPS is the fact that it constitutes a foreign body and prone to complications such as mechanical blockage, shunt infection, shunt migration and rarely shunt protrusion. Shunt extrusion through the vagina and anus are rare but have been documented. We present a rare case of shunt migrating through the external inguinal ring into the scrotal sac in a patient

Field Observations and Geophysical Research Applied to the Detection of Manganese (Mn) Deposits in the Eastern Part of Oban Massif, South-Eastern Nigeria: An Integrated Approach

The growing need for an industrialized world, especially in Africa, cannot be feasible without adequate mineral resources. Thus, the search for more mineral deposits will continue to be necessary. An integrated approach involving geological mapping and a high-resolution geophysical (aeromagnetic) investigation was conducted to assess the manganese mineralization in parts of the Oban Massif, southeast Nigeria. The aeromagnetic data were processed using regional-residual anomaly separation techniques, first vertical derivative (1VD), analytical signals, source parameters imaging (SPI), and Euler deconvolution to better understand magnetic source distributions and their depths of occurrence. The geological investigation revealed a dominant variety of metamorphic rock types, including migmatitic (banded) gneisses hornblende granite gneisses, amphibolites, charnockites, and some quartzite ridges. Also present are some indications of pockets of dolerites. The study area also observed epithermal Mn+Fe+Qtz vein type mineralization associated with hydrothermal alteration zones whose orientation coincides with dominant structural orientation from aeromagnetic interpretation. Analysis of aeromagnetic data shows that the study area is dominated by ENE, NNE, and E-W structural directions (near-surface basement structures), with the ENE trends related to mineralization in the area. The manganese mineralization within Oban Massif is structurally controlled. The depths of the magnetic anomalies in the study area were estimated using SPI and Euler decomposition algorithms. SPI delineated the shallow, intermediate, and deep magnetic anomalies at 84–142 m, 152–200 m, and 215–656 m, respectively. Euler decomposition, however, revealed that shallow, intermediate, and deep depths occurrence of the magnetic anomalies are at 200–377 m, 393–472 m, and 499–793 m, respectivel

Field Observations and Geophysical Research Applied to the Detection of Manganese (Mn) Deposits in the Eastern Part of Oban Massif, South-Eastern Nigeria: An Integrated Approach

The growing need for an industrialized world, especially in Africa, cannot be feasible without adequate mineral resources. Thus, the search for more mineral deposits will continue to be necessary. An integrated approach involving geological mapping and a high-resolution geophysical (aeromagnetic) investigation was conducted to assess the manganese mineralization in parts of the Oban Massif, southeast Nigeria. The aeromagnetic data were processed using regional-residual anomaly separation techniques, first vertical derivative (1VD), analytical signals, source parameters imaging (SPI), and Euler deconvolution to better understand magnetic source distributions and their depths of occurrence. The geological investigation revealed a dominant variety of metamorphic rock types, including migmatitic (banded) gneisses hornblende granite gneisses, amphibolites, charnockites, and some quartzite ridges. Also present are some indications of pockets of dolerites. The study area also observed epithermal Mn+Fe+Qtz vein type mineralization associated with hydrothermal alteration zones whose orientation coincides with dominant structural orientation from aeromagnetic interpretation. Analysis of aeromagnetic data shows that the study area is dominated by ENE, NNE, and E-W structural directions (near-surface basement structures), with the ENE trends related to mineralization in the area. The manganese mineralization within Oban Massif is structurally controlled. The depths of the magnetic anomalies in the study area were estimated using SPI and Euler decomposition algorithms. SPI delineated the shallow, intermediate, and deep magnetic anomalies at 84–142 m, 152–200 m, and 215–656 m, respectively. Euler decomposition, however, revealed that shallow, intermediate, and deep depths occurrence of the magnetic anomalies are at 200–377 m, 393–472 m, and 499–793 m, respectively

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Crude Oil Degradation by Microorganisms in Soil Composts.

The hydrocarbon utilizing capabilities of Micrococcus varians, Bacillus badius, Corynebacterium ulcerans and Corynebacterium amycolatum isolated from soil composts were analysed. In the biodegradation experiment, utilization of the substrate by bacterial isolates resulted in increased population densities with simultaneous increase in emulsification index (EI 24) valued from 30.0 to 48.84 and a decrease in residual crude oil concentration. The growth rate constants (u) and mean generation (h) times of Micrococcus varians, Bacillus badius, Corynebacterium ulcerans and Corynebacterium amycolatum were 0.027 and 25.5, 0.025 and 27.5, 0.019 and 36.2, 0.023 and 30.0, respectively. The gas chromatographic analysis of the residual hydrocarbons in the liquid medium at the end of 30 days incubation showed that Micrococcus varians had the highest degradation rate of 93.10%, whilst Bacillus badius, Corynebacterium ulcerans and Corynebacterium amycolatum were 0.027 and 25.5, 0.025 and 27.5, 0.019 and 36.2, 0.023 and 30.0, respectively. The gas chromatographic analysis of the residual hydrocarbons in the liquid medium at the end of 30 days incubation showed that Micrococcus varians had the highest degradation rate of 93.10%, whilst Bacillus badius, Corynebacterium ulcerans and Corynebacterium amycolatum had biodegradation rates of 89.22, 88.22 and 90.82%, respectively. The residual hydrocarbon in soil microcosm after 30 days of biodegradation was 73.75, 75.81 and 76.94% for Micrococcus varians, Corynebacterium amycolatum and a consortium of the two isolates, respectively. A substrate specificity test of the isolates on different hydrocarbons showed that the isolates had good growth on anthracene and engine oil but poor growth on pyrene, toluene, naphthalene, dodecane and xylene

Spatial Distribution of Base Transceiver Stations in Ile Ife, Nigeria

This paper assesses the spatial distribution of base transceiver stations (BTS) in Ile-Ife, Nigeria. The multi stage sampling technique was employed in the study. The first stage involved the identification of BTS, 50 were identified across the study area, and these were used to obtain information about the physical and locational characteristics of the BTS. Twenty three (23) of the BTS with buildings in their immediate environment were purposively selected. In establishing the location and pattern of distribution of the BTS in Ile-Ife, the nearest neighbor analysis was used. The study revealed a high concentration of BTS erection in area with high concentration of people especially where we have higher institutions and n few residential areas of Ile-Ife. The study further revealed that the distribution of BTS in Ile-Ife are in random form with Rn value of 0.21 and negative z-score (-69.46) which indicates that the BTS are clustered rather than being random or dispersed. The study therefore concludes that telecommunication operators or service providers should be encouraged to adopt the method of collocation which enables different service providers to connect to a mast at a particular place in time. This is done in order to reduce clustering of masts in the study area. Keywords: Base transceiver stations, Location, NCC, Spatial distribution, Telecommunication mast DOI: 10.7176/JEES/12-6-05 Publication date:June 30th 202

Unusual complication of ventriculoperitoneal shunt

Abstract Ventriculoperitoneal shunt (VPS) is the conventional method of managing hydrocephalus until recently that endoscopic third ventriculostomy is becoming popular. The major disadvantage of VPS is the fact that it constitutes a foreign body and prone to complications such as mechanical blockage, shunt infection, shunt migration and rarely shunt protrusion. Shunt extrusion through the vagina and anus are rare but have been documented. We present a rare case of shunt migrating through the external inguinal ring into the scrotal sac in a patient

Unusual complication of ventriculoperitoneal shunt

Abstract Ventriculoperitoneal shunt (VPS) is the conventional method of managing hydrocephalus until recently that endoscopic third ventriculostomy is becoming popular. The major disadvantage of VPS is the fact that it constitutes a foreign body and prone to complications such as mechanical blockage, shunt infection, shunt migration and rarely shunt protrusion. Shunt extrusion through the vagina and anus are rare but have been documented. We present a rare case of shunt migrating through the external inguinal ring into the scrotal sac in a patient