Decay time characteristics of La2O2S:Eu and La2O2S:Tb for use within an optical sensor for human skin temperature measurement

We focus on the development of a remote temperature sensing technology, i.e., an optical laser-based sensor, using thermographic phosphors for medical applications, particularly within an electromagnetically hostile magnetic resonance imaging (MRI) environment. A MRI scanner uses a strong magnetic field and radio waves to generate images of the inside of the body. The quality of the image improves with increasing magnetic resonance; however, the drawback of applying a greater magnetic strength is the inducement of heat into the body tissue. Therefore, monitoring the patient’s temperature inside MRI is vital, but until now, a practical solution for temperature measurement did not exist. We show europium doped lanthanum oxysulphide (La2O2S∶Eu) and terbium doped lanthanum oxysulphide (La2O2S∶Tb) are both temperature sensitive to a low temperature range of 10–50 °C when under ultraviolet (UV) excitation. The emission spectra and decay time characteristics of these phosphors were demonstrated. The results indicate that La2O2S∶Eu has a quenching rate of 13:7m°C−1 and 4m°C−1 at 512nm and 538 nm, respectively. In addition, La2O2S∶Tb has a lower quenching rate of 4:19m°C−1 at 548nm due to its faster decay time

Health care-seeking behaviour and out-of-pocket payments in Tbilisi, Georgia.

Based on a household survey conducted in Tbilisi, Georgia, in 2000, this paper examines current patterns of health care-seeking behaviour and the extent of out-of-pocket payments. Results show that health care services are a financial burden and that private (out-of-pocket) payment creates financial barriers to accessing health services. Members of the poorest households are less likely to seek care than people from more affluent households, and devote a higher share of household monthly expenditure to health care. Households have adopted various strategies to overcome these financial barriers, but the strategies are likely to contribute to both declining economic status and worsening health outcomes. The paper provides an evidence base to help direct future policy reform in Georgia. Government needs to: (1) prioritize public financing of services for the poor, in particular through amending the Basic Benefit Package so that it better reflects the needs of the poor; (2) promote the quality and utilization of primary care services; (3) address the issue of rational drug use; and (4) consider mobilizing out-of-pocket payments on a pre-paid basis through formal or community-based risk pooling schemes

A preliminary examination of prehistoric coastal settlement at Nelson Bay, West coast of Tasmania

This paper describes the results and interpretations of a preliminary survey of archaeological sites on the west coast of Tasmania undertaken as part of a PhD project into the prehistory of the area

Effects of soil and canopy characteristics on microwave backscattering of vegetation

A frequency modulated continuous wave C-band (4.8 GHz) scatterometer was mounted on an aerial lift truck and backscatter coefficients of corn were acquired as functions of polarizations, view angles, and row directions. As phytomass and green leaf area index increased, the backscatter also increased. Near anthesis when the canopies were fully developed, the major scattering elements were located in the upper 1 m of the 2.8 m tall canopy and little backscatter was measured below that level. C-band backscatter data could provide information to monitor vegetation at large view zenith angles

Understanding fatherhood in the digital age

In this blog, Gillian Ranson looks into the rise of the father blogger. Recognising their growing impact, she reflects on the role of father bloggers with advertising as they become a potential source of revenue, as well as their position as ‘parent experts’ who are professionalised as fathers. Gillian is Professor Emerita of Sociology at the University of Calgary, Canada. She is currently working on a book project examining parenting culture in Canada today

Skylab-EREP studies in computer mapping of terrain in the Cripple Creek-Canon City area of Colorado

Multispectral-scanner data from satellites are used as input to computers for automatically mapping terrain classes of ground cover. Some major problems faced in this remote-sensing task include: (1) the effect of mixtures of classes and, primarily because of mixtures, the problem of what constitutes accurate control data, and (2) effects of the atmosphere on spectral responses. The fundamental principles of these problems are presented along with results of studies of them for a test site of Colorado, using LANDSAT-1 data

The mixture problem in computer mapping of terrain: Improved techniques for establishing spectral signatures, atmospheric path radiance, and transmittance

There are no author-identified significant results in this report

Delayed mortality effects cut the malaria transmission potential of insecticide resistant mosquitoes

Malaria transmission has been substantially reduced across Africa through the distribution of long-lasting insecticidal nets (LLINs). However, the emergence of insecticide resistance within mosquito vectors risks jeopardizing the future efficacy of this control strategy. The severity of this threat is uncertain because the consequences of resistance for mosquito fitness are poorly understood: while resistant mosquitoes are no longer immediately killed upon contact with LLINs, their transmission potential may be curtailed because of longer-term fitness costs that persist beyond the first 24 h after exposure. Here, we used a Bayesian state-space model to quantify the immediate (within 24 h of exposure) and delayed (>24 h after exposure) impact of insecticides on daily survival and malaria transmission potential of moderately and highly resistant laboratory populations of the major African malaria vector Anopheles gambiae. Contact with LLINs reduced the immediate survival of moderately and highly resistant An. gambiae strains by 60–100% and 3–61%, respectively, and delayed mortality impacts occurring beyond the first 24 h after exposure further reduced their overall life spans by nearly one-half. In total, insecticide exposure was predicted to reduce the lifetime malaria transmission potential of insecticide-resistant vectors by two-thirds, with delayed effects accounting for at least one-half of this reduction. The existence of substantial, previously unreported, delayed mortality effects within highly resistant malaria vectors following exposure to insecticides does not diminish the threat of growing resistance, but posits an explanation for the apparent paradox of continued LLIN effectiveness in the presence of high insecticide resistance

Age-related changes to lumbosacral spinal cord motoneurons that modulate bladder and bowel functions in male C57BL/6 mice

Incontinence and sexual dysfunction are often increased in the aged human population. In rats and mice the pattern of micturition and faecal clearance also changes with ageing and is suggestive of bladder and bowel dysfunction

Risk factors for lower leg, ankle and foot injuries during basic military training in the Maltese Armed Forces

Objectives - Basic military training is physically and psychologically demanding placing recruits at high risk of injury and premature discharge. This study aimed to identify risk factors for lower leg, ankle and foot injury in Maltese military recruits during basic training. Design - This was a prospective cohort study. Setting - An armed forces barracks. Participants - 127 recruits commencing one basic military training course agreed to participate in the study. The cohort comprised 114 males and 13 females with a mean age of 21.7 ± 2.4 years. Main outcome measures - All injuries to the lower leg, ankle and foot were recorded using the Orchard Sports Injury Classification System. Injuries were analysed for associations with fitness scores, smoking status, body mass index and foot type. Results - A total of 34 (26.2%) recruits sustained at least one injury, with 10 recruits (7.9%) terminating their training prematurely (three due to musculoskeletal injury). Smoking history, body mass index and foot type were not associated with injury risk. Lower fitness levels at the commencement of basic military training compared with fitness levels measured six months prior, were associated with higher injury risk. Conclusions - Lower fitness at the commencement of basic training was associated with higher injury risk in army recruits. Thus, conditioning programmes aimed at improving recruit fitness should be considered within an injury prevention strategy