Mini Review on the Structure and Properties (Photocatalysis), and Preparation Techniques of Graphitic Carbon Nitride Nano-Based Particle,and Its Applications

Graphite carbon nitride (g-C₃N₄) is well known as one of the most promising materials for photocatalytic activities, such as CO₂ reduction and water splitting, and environmental remediation through the removal of organic pollutants. On the other hand, carbon nitride also pose outstanding properties and extensive application forecasts in the aspect of field emission properties. In this mini review, the novel structure, synthesis and preparation techniques of full-bodied g-C₃N₄-based composite and films were revealed. This mini review discussed contemporary advancement in the structure, synthesis, and diverse methods used for preparing g-C₃N₄ nanostructured materials. The present study gives an account of full knowledge of the use of the exceptional structural and properties, and the preparation techniques of graphite carbon nitride (g-C₃N₄) and its applications.     

Community Participation in Urban Planning: the Case of Managing Green Spaces in Kumasi,Ghana

The entrenched position now taken by participatory planning in urban planning practice has made the call for community participation in the planning process now higher than ever. Community participation has been well-acknowledged to give local people a voice in planning decisions. This paper assessed the level of participation by local people in the management of urban green spaces. Using a case study research approach, Kumasi city, once the garden city of Africa was selected as the study area. The Kumasi city authorities, and residents including opinion leaders, and officials of allied bodies on green spaces constituted the study’s target population. A blend of qualitative research techniques such as in-depth interviews, focus group discussion, and personal observation was employed whilst theoretical sampling technique was adopted. It was found out that the participation of the local people in the management of green space was low. The local people were neither consulted nor informed on green space projects (parks and gardens) by the city authorities. They were also not empowered to self-facilitate initiatives on green spaces and passively involved in final decisions on green spaces. To correct the situation, it is recommended that features of the communicative planning theory such as dialogue, consensus building, and facilitative leadership should be given attention in the urban planning system of Kumasi especially on green space projects.     

A comparison between hexaaluminates and perovskites for catalytic combustion applications

Hexaaluminates and perovskites are two promising candidates for use in catalytic combustion applications. In the present study two hexaaluminates, LaMnAl₁₁O₁₉ and LaCoAl₁₁O₁₉, were compared with two perovskites, LaMnO₃ and LaCoO₃, with respect to their thermal stability and catalytic activity for combustion of methane and gasified biomass. The results showed that the hexaaluminates retained a much higher surface area even after calcination at 1200 °C compared to the perovskites. LaMnAl₁₁O₁₉ showed the highest catalytic activity of all catalysts. LaCoAl₁₁O₁₉ generally showed low activity. Of the two perovskites, LaCoO₃ was the most active, and the initial test run the activity for biomass combustion were close to that one of LaMnAl₁₁O₁₉ even though its surface area was only one tenth of the hexaaluminate's. However, it was severely deactivated in the second test run. Similar deactivation but less severe was also found for the other catalyst.     

Aflatoxin content in cereal-legume blends on the Ghanaian market far exceeds the permissible limit

Cereals and legumes, the main ingredients used in the preparation of complementary foods in Ghana, have been associated with aflatoxin contamination. This study aimed to determine aflatoxin contamination levels in cereal-based complementary foods on the Ghanaian market. A cross-sectional survey design over a two-week period was used to sample 48 commercial complementary food brands on an as available-basis from supermarkets or mini-marts in all 10 regions of Ghana. A tablet-assisted aflatoxin mobile Assay (mReader) that uses Reveal Q+ test strips (Neogen Corporation) was used to quantify the level of aflatoxin in the samples. All samples were contaminated with aflatoxin. Concentrations in cereal-legume blends ranged from 1 to 1094 ppb while those in cereal-only samples ranged from 1 to 11.7 ppb. The lowest aflatoxin concentrations were recorded in samples from the Upper East region with a mean of 1.5 ppb (1 to 3.8 ppb) while the highest were in samples from the Central region with a mean concentration of 457 ppb (6.6–1094 ppb). Aflatoxin concentrations in approximately a third of the infant formulations sampled exceeded the acceptable standard of 20 ppb, some by a factor of over 5 (100 ppb), and may contribute to the perennial malnutrition (stunting and iron deficiency) prevalent among children in Ghana.     

Land Governance and Decentralised Physical Planning in mid-Sized Cities in Ghana: a Case Study of the Nkoranza South Municipality

Physical planning is influenced by a number of variables. The key among these in the Ghanaian context is the system of land governance. This paper attempts to examine the extent to which the decentralised planning system of Ghana is capable of addressing the challenges facing mid-sized cities, particularly under the reformed land governance system. This is important because physical planning in Ghana is organised under a system whereby land is governed and/or owned by authorities other than the state apparatus. Two key questions are the basis for this enquiry–how is physical planning in Ghana conceived and actually executed? What are the characteristics of the reformed land governance system of Ghana and how have these affected decentralised physical planning and spatial governance? A case study approach which enables a detailed and holistic analysis of the phenomenon was used to investigate physical planning practice in a selected mid-sized city in Ghana. The study establishes that physical planning in Ghana is not driven by long-term sustainable development visions; there is the absence of planning concepts, principles and norms; and there is no clear land use regulator. The study recommends that the local government bodies in Ghana take up their responsibility as land use regulators by improving the capacity of their physical planning departments to deliver on their mandate. It is also recommended that physical planning be conducted in a participatory manner within the framework of the National Development Planning (Systems) Act 1994 (Act 480). It is argued that this will imply a move away from “zoning and rezoning” to strategic spatial planning.     

Exploring managerial factors affecting ERP implementation: an investigation of the Klein‐Sorra model using regression splines

Abstract. Predicting successful implementation of enterprise resource planning (ERP) systems is still an elusive problem. The cost of ERP implementation failures is exceedingly high in terms of quantifiable financial resources and organizational disruption. The lack of good explanatory and predictive models makes it difficult for managers to develop and plan ERP implementation projects with any assurance of success. In this paper we investigate the Klein & Sorra theoretical model of implementation effectiveness. To test this model we develop and validate a data collection instrument to capture the appropriate data, and then use multivariate adaptive regression splines to examine the assertions of the model and suggest additional significant relationships among the factors of their model. Our research offers new dimensions for studying managerial interventions in IT implementation and insights into factors that can be managed to improve the effectiveness of ERP implementation projects.     

Process optimization under uncertainty when there is not enough process data at the operation stage

The main issues in the design and optimization of a chemical process under uncertainty are the feasibility test, flexibility index and the two-step optimization problem. The formulations of these problems are based on the implicit supposition that at the operation stage it is possible to correct all uncertain parameters in the chemical process models. However, in practice, one can improve the accuracy of only some of the uncertain parameters. As a result, we consider two groups of uncertain parameters. We postulate that one can significantly improve the accuracy of the first group of uncertain parameters using process data at the operation stage. This necessitates the formulation of a new feasibility test and the associated two-stage optimization problem. We consider the general case when both groups of uncertain parameters may or may not be statistically dependent. We propose methods of solving the problems based on the supposition that the parametric uncertainty region is small. Under this condition, the process models are well represented by linearized models whose accuracy is asymptotically equal to that of the original process models. This leads to substantial computational savings. Computational tests show that when it is not possible to improve the accuracy of some of the uncertain parameters, using standard flexibility analysis can lead to processes that are not flexible.     

Effect of different antioxidants on lycopene degradation in oil‐in‐water emulsions

There is interest in incorporating lycopene into foods because it is a natural pigment and can also play a role in preventing disease. Therefore, the effect of the addition of various antioxidants in lycopene containing oil‐in‐water emulsions stabilized with Tween 20 at acidic pH was studied in order to determine protection systems against lycopene oxidation. In this model, EDTA showed pro‐oxidant activity while other chelators like citric acid and tripolyphosphate showed no effect. The free radical scavengers, propyl gallate (PG), gallic acid (GA), and α‐tocopherol all had the ability to decrease lycopene oxidation with α‐tocopherol being the most effective. The combination of 1 µM α‐tocopherol and 10 µM GA was more effective than the individual antioxidants. Addition of ascorbic acid to the combination of α‐tocopherol and GA system accelerated lycopene loss. These results suggest that by the proper selection of free radical scavenging antioxidants, lycopene stability in oil‐in‐water emulsions could be significantly improved. Practical applications: Evidence that dietary lycopene decreases the risk for a number of health conditions has generated new opportunities for addition of lycopene to functional foods. A successful strategy to deliver lycopene into foods is by means of oil‐in‐water emulsions. However, lycopene may decompose thus causing nutritional loss and color fading. In order to prevent this, the effectiveness of various antioxidants and their combinations in Tween 20 stabilized oil‐in‐water emulsions was studied. Overall, lycopene oxidation in oil‐in‐water emulsions could be significantly reduced by the proper selection of free radical scavengers. This fact is of interest to food industry for increasing the shelf‐life of lycopene containing functional foods where the lycopene is dispersed in the food in the form of an oil‐in‐water emulsion.     

Problems of information technology diffusion in sub-Saharan Africa: the case of Ghana

In the modern information economy, information technology diffusion is credited with the significant increase in economic development experienced in many parts of the world except, perhaps, sub-Saharan Africa. This paper discusses the problems associated with information technology (IT) diffusion in sub-Saharan Africa, ranging from unstable and erratic power supply and unreliable telecommunications to inadequate computing resources, and most significantly, to the lack of human and financial resources to tackle the challenges. Empirical data obtained through a survey questionnaire are analyzed to illustrate the extent of the problems in the case of Ghana. The paper concludes with discussion of possible strategies for tackling these problems. Mina Baliamoune is the accepting Associate Editor for this article. * Kweku Osei-Bryson is the accepting Associate Editor for this article.View all notes