Natural resources utilization by the Aweer in Boni-lungi and Dodori national reserves, Kenya

A study was conducted to record the utilization of Boni-Lungi and Dodori National Reserves by the Aweer community. Results indicate the procuring of a wide gamut of provisional, regulatory, cultural and supportive services from these reserves by the community ranging from wood forest products utilized in construction to their use in expression of religious beliefs to non-wood products. In addition, 16 wildlife species were found to be utilized as primary source of protein, with eggs (guinea fowls and ostrich), fish and honey were utilized as secondary products, while various fungi and algae were consumed as vegetables. Resource extraction occurred with a seasonal dissimilitude.  This study underscores the need for appreciation of Aweer ethnobiology input on native forest conservation.Keywords: Aweer community, Boni-Lungi and Dodori National Reserves, Indigenous Knowledge, Natural Resources Utilizatio

Assessment of integrated aerosol sampling techniques in indoor, confined and outdoor environments characterized by specific emission sources

This paper highlights advantages and drawbacks due to the use of portable and low-cost devices for aerosol sampling, showing their performances during an aerosol monitoring campaign with the parallel use of the gravimetric sampling reference method and a cascade impactor. A specific monitoring campaign was held running all instruments in parallel in indoor, confined, and outdoor environments characterized by local emission sources or particulate matter background concentra-tions. PM2.5 concentrations were used to compare data emerging from the different instruments adopted. Significant underestimation of PM2.5 emerged when comparing data coming from optical sensors with those estimated by the cascade impactor, whose data resulted in being coherent with gravimetric determination, integrated over the same sampling time. A cause–effect relationship between PM2.5 concentrations and specific emission sources was found when observing the daily patterns of all the real-time sampling devices. It emerged that optical devices are useful for detecting concentration trends, the presence of peak values, or changes in the background value, even if with limited accuracy and precision. The comparison with particle size distributions obtained by the cascade impactor data allowed us to define which particle sizes are not detected by different optical devices, evidencing a low representativeness of optical low-cost sensors for health exposure measurements. The correlations among the specific particle size fractions detected by the cascade im-pactor and their specific emission sources were particularly high for car emissions in a semi-confined garage area

The assessment of a method for measurements and lead quantification in air particulate matter using total reflection X-ray fluorescence spectrometers

This paper presents the assessment of a direct method to measure and analyse Pb in air particulate matter (PM) collected on polytetrafluoroethylene (PTFE) filtering membranes prepared by the SMART STORE® procedure. The suitability of grazing incidence X-ray fluorescence technique is verified on a set of continuous and conformal thin film samples created by atomic layer deposition. Different scans changing the angles of incidence are performed and the fluorescence intensity of thin films on PTFE substrate compared with that obtained by similar thin films deposited on Si wafer substrates. The effects of sample preparation, constraints, and limitations of the experimental setup are discussed. The results obtained by three commercial total reflection X-ray fluorescence spectrometers, equipped with Mo or Rh X-ray tubes, are compared. Reference samples with different Pb content are used to define the best measurement conditions, corresponding to the maximum fluorescence intensity. The precision is evaluated in terms of relative standard deviation of the net intensity, taking into account the homogeneity of the PM samples and hardware contributions to the errors. The calibration curves are built on the basis of mono- and multi-elemental Pb loaded PTFE reference samples. The analytical parameters, namely linear calibration and determination range, limits of detection, and quantification, are determined

Violence and exodus in Kenya's Rift Valley, 2008: predictable and preventable?

This article offers a preliminary analysis of the outbreak of violence in the Rift Valley Province of Kenya, over January and February 2008, following the national elections of December 2007. Maps of the earliest phase of the violence are reproduced to illustrate the sequencing and location of conflict. The causes of the violence are explored through discussion of historical patterns of land settlement in the Rift Valley, the impact of political violence in key constituencies since the early 1990s, and more recent political contingencies around the question of constitutional reform and regionalism (majimboism). The violence of 2008 bore strong similarities to earlier episodes of conflict in the Rift Valley, and in that sense was predictable and might have been prevented. Though the December 2007 poll was the catalyst for this violence, its causes are to be found in deeper-rooted historical and political conflicts

Assessment of integrated aerosol sampling techniques in indoor, confined and outdoor environments characterized by specific emission sources

This paper highlights advantages and drawbacks due to the use of portable and low-cost devices for aerosol sampling, showing their performances during an aerosol monitoring campaign with the parallel use of the gravimetric sampling reference method and a cascade impactor. A specific monitoring campaign was held running all instruments in parallel in indoor, confined, and outdoor environments characterized by local emission sources or particulate matter background concentra-tions. PM2.5 concentrations were used to compare data emerging from the different instruments adopted. Significant underestimation of PM2.5 emerged when comparing data coming from optical sensors with those estimated by the cascade impactor, whose data resulted in being coherent with gravimetric determination, integrated over the same sampling time. A cause–effect relationship between PM2.5 concentrations and specific emission sources was found when observing the daily patterns of all the real-time sampling devices. It emerged that optical devices are useful for detecting concentration trends, the presence of peak values, or changes in the background value, even if with limited accuracy and precision. The comparison with particle size distributions obtained by the cascade impactor data allowed us to define which particle sizes are not detected by different optical devices, evidencing a low representativeness of optical low-cost sensors for health exposure measurements. The correlations among the specific particle size fractions detected by the cascade im-pactor and their specific emission sources were particularly high for car emissions in a semi-confined garage area