Looking Inwards for Sustainability: Nigerian Cities and Building Demolition-waste or wealth?

Cities could generally be described as sustainable before the replacement of manual labour with machines known as the industrial revolution of the 18th century in Europe. Nevertheless, the Industrial Revolution has been associated with environmental degradation and other negative impacts. The trend continued for two centuries until it was realised that there is a limit to the capacity of the earth to withstand such impacts. The damage to the earth needs to be halted by choice or forced by natural consequences. The idea of pursuing economic development with minimum negative socio-economic and environmental impacts comes to be known as Sustainability. The built environment becomes at the centre of the sustainability agenda due to the enormous negative impact to the environment. Moreover, it was reported that 90% of all materials resources ever extracted might be used in the built environment. Unfortunately, many of these materials, including 10% unused are discarded as wastes. In the UK example, 90-120 million tonnes of construction and demolition (C&D) waste is generated annually. This makes C&D wastes even more critical to the sustainability agenda; and in search for solution, in the words of Janine Benyus, it may even involve the urban westerners learning from the wisdom of the preindustrial societies that have been living in harmony with the nature. In the preindustrial community of Kano in Nigeria, there is virtually zero C&D waste; rather it is merchandise. The different categories of the stakeholders were interviewed to establish how the system works, the conditions that led to its emergence, and limitations. It was discovered that the end-of-life management of buildings in Kano is a naturally evolved industrial ecology analogous to the natural ecological system, whereby the bye-product of one process becomes the raw material for another with no waste. Furthermore, a conceptual model of the system was developed using the biomorphic adaptation of the shell of an African snail. It was therefore argued that sustainability practices are inherent within the African traditions rather than to be learnt from outside

AN EXAMINATION OF THE EMPIRICAL PROPERTIES OF DUALITY BETWEEN THE RESTRICTED PROFIT, UNRESTRICTED PROFIT, AND PRODUCTION FUNCTIONS

This research examines the empirical properties of duality theory. A comparison of the Hessian matrices calculated from the normalized unrestricted and restricted profit, and production functions indicate that duality is highly sensitive to measurement error and relative price variability. Keywords: duality, restricted and unrestricted profit functionsduality, restricted and unrestricted profit functions, Demand and Price Analysis, Production Economics,

The luminescence studies of alpha-1-acid glycoprotein and its basic drug-binding properties

A study of the luminescence properties of alpha-1-acid glycoprotein (α1AAGP) and its basic drug binding properties was carried out. The fluorescence and phosphorescence properties of the protein were studied. The luminescence were found not to differ from those of a typical protein. The effect of basic drug binding on the α1AAGP fluorescence or the drug fluorescence quantum yield was investigated. Drugs studied were; propranolol, chlorpromazine and imipramine. Only chlorpromazine showed quenching of the protein fluorescence. [Continues.

Serum homocysteine level in hormonal contraceptive users in Kano Metropolis

Background: Homocysteine is a sulfur containing amino acid that is normally present in all cells of the body. The homocysteine level is linked to folate and Vitamin B-12 levels. Aim: The aim of this study was to investigate the effect of hormonal contraceptives (HCPs) on homocysteine levels among healthy women using the HCPs. Method: A total of 90 participants were recruited in this study; 60 women on hormonal contraceptives served as the case group and 30 non-HCP users were considered as control. Blood samples were collected, and serum was analyzed for homocysteine levels in both groups. The mean ± standard deviation of the homocysteine levels were then determined and compared using student t-test. Results: The mean ± standard deviation of Serum Homocysteine in the case group, (14.14 ± 7.56μmol/L, was found to be significantly higher than the mean ± standard deviation of the control group which was 9.59 ± 5.87μmol/L (p-value of 0.005). The study also found statistically significant positive correlation (r<1) between duration of hormonal contraceptives use and serum homocysteine levels of HCPs users with r-value of 0.058. Conclusion: This study observed significant relationship between HCPs and increased serum homocysteine. Significantly increased homocysteine levels were observed in HCPs users compared to non-users. There was also positive correlation between the duration of HCP usage and increased homocysteine levels. Keywords: Contraception; Folate; Homocystinuria; Oral contraceptive

Living with diversity and change: Intergenerational differences in language and identity in the Somali community in Britain

The Somali community in Britain has been portrayed as largely homogenous and rather problematic, unwilling to integrate into mainstream British society, a perception that is reinforced by the media and government policies. The government policies tend to ignore the internal diversity and change that the community is experiencing. Drawing on data from a family language policy project, this paper aims to explore intergenerational changes in language preference and use and associated issues of identity within the Somali community in Britain. We look at how the changes in language preference and practice manifest themselves through reported language use and language policies at home, how the changes are affecting the British Somali youths in particular, and how ideas of Somaliness and Britishness are negotiated on an individual level, as well as on a community-wide level through Somali-led organisations. And we highlight the work that the community is doing to tackle issues of intergenerational language shift and Somali identity building. The study aims to contribute to a better understanding of the struggles of the Somali community in Britain in dealing with diversity and change, an understanding that is crucial to the development of appropriate policies regarding the community

Empirical properties of duality theory

This research examines selected empirical properties of duality relationships. Monte Carlo experiments indicate that Hessian matrices estimated from the normalised unrestricted profit, restricted profit and production functions yield conflicting results in the presence of measurement error and low relative price variability. In particular, small amounts of measurement error in quantity variables can translate into large errors in uncompensated estimates calculated via restricted and unrestricted profit and production functions. These results emphasise the need for high quality data when estimating empirical models in order to accurately determine dual relationships implied by economic theory.Research Methods/ Statistical Methods,

Evaluation of serum Vitamin B12 levels in hormonal contraceptive users in some hospitals in Kano Metropolis

Aim: The aim of the study was to compare the levels of Vitamin B12in hormonal contraceptive users and women not on hormonal contraceptives in Kano. Methods: A total of 90 participants were recruited for the study; 60 were on hormonal contraceptive (HCP) users and served as the study subjects while 30 were apparently healthy non hormonal contraceptive users recruited as control subjects. Serum VitaminB12levels were evaluated for both groups and the mean levels were compared. Results: Among the 60 HCP users that were enrolled in this study, 29 use implants (48.3%), 14 (23.3%) used injectables;11 (18.3%) use oral pills and 6 (10.0%) participants used intrauterine contraceptive devices. Serum vitamin B12 levels of the two groups were determined using human B12 specific ELISA kit. The mean ± standard deviation of vitamin B12 levels in hormonal contraceptive users was 163.33±53.128 pg/ml while that of non-HCP users was 381.33±198.542 pg/ml. Statistical analysis for B12 levels indicated a statistically significant decrease in oral contraceptive users with a p-value of <0.001. The study also found statistically significant negative correlation (r<1) between duration of hormonal contraceptive use and serum vitamin B12 levels of HCPs users with r-value of -0.031 and p-value of 0.020. Conclusion: The present study observed a significant association between hormonal contraceptive use and serum vitamin B12 level. Significantly lower serum vitamin B12 concentrations were observed in HCP users. Therefore, Vitamin B12 supplementation or different contraceptive methods should be considered in women with pre-existing B12deficiency or restrictive dietary habits as the deficiency may be worsened by hormonal contraceptive use. Keywords: Contraception; Combined oral contraceptives; Vitamin B12; Vitamin B12 deficienc

Heavy metals phytoremediation using Typha domingensis Flourishing in an industrial effluent drainage in Kano, Nigeria

Phytoremediation as a tool employs aquatic macrophytes as a principal and inexpensive strategy for controlling environmental pollution. It is achieved through various mechanisms such as phytoextraction, phytostabilization, and phytovolatilization. In this study, heavy metal content of a contaminated drainage that empties into the Kano River was investigated by assessing the uptake of heavy metal contaminants by a notorious aquatic weed, “Typha domingensis”. Atomic Absorption Spectrophotometer (AAS) was used to determine the concentration of Pb, Cu, Zn, Cr and Fe in the effluent, sediment and T. domingensis in the months of January, April and July 2013, covering the seasonal weather pattern in the area. In addition, the Bioconcentration factor (BCF) of these metal pollutants in T. domingensis, were calculated as the ratio of their concentration in Typha domingensis to the effluent while the Transfer factor (TF), as the ratio of these substances in T. domingensis to the sediment. From the results, Cu, Fe and Zn concentrations were statistically different (p<0.05) in the effluent as well as in the sediment across the sampling months, while Pb and Cr were significant only in the sediment. The BCF values obtained for these metals in the test plant were >1 except for Fe in April, which indicates the plant capacity for phytoextraction. Similarly, TF values obtained were >1 except for Pb, Fe and Cu in the months of January, April and July respectively. This also indicates the potentiality of T. domingensis as a nutrient and metalaccumulating plant through the process of sequestration. The findings of this work have demonstrated the capacity of T. domingensis in the effluent drainage, not only playing an ecological role in the environment, but also to remove heavy metal pollutants. Therefore, the plant species could be used for phytoremediation of industrial effluent contaminating ecosystems.Keywords; T. domingensis, phytoremediation, Heavy metals, industrial effluen

A 10B-based neutron detector with stacked Multiwire Proportional Counters and macrostructured cathodes

We present the results of the measurements of the detection efficiency for a 4.7 \r{A} neutron beam incident upon a detector incorporating a stack of up to five MultiWire Proportional Counters (MWPC) with Boron-coated cathodes. The cathodes were made of Aluminum and had a surface exhibiting millimeter-deep V-shaped grooves of 45{\deg}, upon which the thin Boron film was deposited by DC magnetron sputtering. The incident neutrons interacting with the converter layer deposited on the sidewalls of the grooves have a higher capture probability, owing to the larger effective absorption film thickness. This leads to a higher overall detection efficiency for the grooved cathode when compared to a cathode with a flat surface. Both the experimental results and the predictions of the GEANT4 model suggests that a 5-counter detector stack with coated grooved cathodes has the same efficiency as a 7-counter stack with flat cathodes. The reduction in the number of counters in the stack without altering the detection efficiency will prove highly beneficial for large-area position-sensitive detectors for neutron scattering applications, for which the cost-effective manufacturing of the detector and associated readout electronics is an important objective. The proposed detector concept could be a technological option for one of the new chopper spectrometers and other instruments planned to be built at the future European Spallation Source in Sweden. These results with macrostructured cathodes generally apply not just to MWPCs but to other gaseous detectors as well.Comment: 14 pages, 9 figure

Upgrading n-Heptane via Catalytic Hydroisomerisation

An atmospheric pressure upgrading of n-heptane was carried out in a temperature range of 300 to 450oC over an in situ developed molybdenum carbide phase supported over sulphated zirconia. Although a decreased in surface area with increased in pore volume were observed after carburization, the physicochemical data showed no noticeable alteration to the zirconia structure or the sulphate species. The catalyst formed a good system with high selectivity to iso-heptanes under either low temperature or high space velocity. It therefore has promising features that could offer mitigation to some of the challenges faced by the petroleum refineries with noble metals promoted zeolites. Keywords: n-heptane, hydroisomerisation, carbide catalyst, stability, sulphated zirconia