Radiation-balanced lasing in Yb3+:YAG and Yb3+:KYW.

Radiation-balanced lasing and thermal profiling is reported in two Yb-doped laser crystals at room temperature. In 3% Yb3+:YAG a record efficiency of 30.5% was achieved by frequency-locking the laser cavity to the input light. Both the average excursion and axial temperature gradient of the gain medium were maintained within 0.1 K of room temperature at the radiation balance point. By including saturation of background impurity absorption in the analysis, quantitative agreement was obtained between theory and the experimentally measured laser threshold, radiation balance condition, output wavelength, and laser efficiency with only one free parameter. Radiation-balanced lasing was also achieved in 2% Yb3+:KYW with an efficiency of 2.2% despite high background impurity absorption, losses from Brewster end faces that were not parallel, and non-optimal output coupling. Our results confirm that relatively impure gain media can be operated as radiation-balanced lasers, contrary to earlier predictions which ignored background impurity properties.

'A cry in the dark': a qualitative exploration of living with cluster headache.

CONTEXT: Cluster headache is a rare primary headache disorder said to be one of the most painful conditions in existence. Limited evidence demonstrates cluster headache patients have difficulties securing a diagnosis and poor access to services. There is a gap in research around psychosocial needs, meaning there are no evidence-based guidelines to inform optimal management of this patient group in primary care. OBJECTIVES: The aim of this study is to explore the perspectives of cluster headache patients in the United Kingdom in order to suggest ways their care can be improved. METHODS: It is an in-depth qualitative study involving telephone interviews with 15 participants with either chronic or episodic cluster headache. Semi-structured interviews (43-58 minutes) were conducted, recorded and transcribed verbatim. Two researchers conducted thematic analysis to identify themes. RESULTS: Participants described the impact cluster headache has on their quality of life. They also felt the legitimacy of their disorder was questioned. This situation was often exacerbated by a reported lack of awareness among General Practitioners (GPs), which negatively impacted their care in terms of diagnosis and access to treatments and specialists. They attempted to control the pain through treatments and avoiding triggers, often with detrimental consequences for their social contact and mental health. CONCLUSION: Findings indicate the need to improve the lived experience of cluster headache patients in two key areas: (1) raising awareness of the disorder and its impact among GPs, and (2) extending care beyond clinical treatment provision, supporting patients in self-management and addressing its psychosocial impact, with implications for the management of this group in primary care.

Laser cooling of Yb3+:KYW.

We report the first observation of laser cooling in Yb3+:KYW and validate the results by comparison with experiments in the well-studied material Yb3+:YAG. Radiation from a single-mode Ti:Al2O3 laser was used to achieve cooling of 1.5 K/W in 1% Yb:KYW at 1025 nm, comparing well with the reference material 3% Yb:YAG which cooled by 3.5 K/W at 1030 nm under open lab conditions. Experimental results for KYW crystals mounted on aerogels and doped with 1-20% Yb were in excellent agreement with the theoretical dependence of cooling power on the Yb absorption spectrum. Elimination of thermal conduction through the sample support structure was found to permit the attainment of lower temperatures and to simplify modeling of radiation balance conditions in self-cooled lasers with longitudinal thermal gradients. Contrary to the notion that more coolant ions yield higher cooling power, concentrations of Yb over 1% caused re-absorption of luminescence in KYW crystals, leading to a progressive red shift in the optimal cooling wavelength and the prevention of laser cooling altogether in a 20% sample at room temperature. The prospect of attaining radiation-balanced lasing in commercially-available tungstate crystals is evaluated.

Lampião, Lages, Lombroso: the autopsy of the bandit king of the Brazilian backlands.

Lampião, the most infamous Brazilian brigand leader, was killed and decapitated during an ambush in 1938. The Alagoas police coroner, Dr. José Lages Filho, performed an autopsy of his head. Strongly biased toward the anthropologic ideas of the famous Italian psychiatrist and criminalist Cesare Lombroso, the examination found only a few of the so-called criminal inborn traits. The Lombrosian doctrine and a number of related theories strongly influenced medical and political reasoning in the first half of the 20th century. Modern genetic and neuroscientific studies are still looking for the potential biological roots of misbehavior and criminality.

Lampião, Lages, Lombroso: the autopsy of the bandit king of the Brazilian backlands / Lampião, Lages, Lombroso: a autópsia do Rei do Cangaço

ABSTRACT Lampião, the most infamous Brazilian brigand leader, was killed and decapitated during an ambush in 1938. The Alagoas police coroner, Dr. José Lages Filho, performed an autopsy of his head. Strongly biased toward the anthropologic ideas of the famous Italian psychiatrist and criminalist Cesare Lombroso, the examination found only a few of the so-called criminal inborn traits. The Lombrosian doctrine and a number of related theories strongly influenced medical and political reasoning in the first half of the 20th century. Modern genetic and neuroscientific studies are still looking for the potential biological roots of misbehavior and criminality.

RESUMO Lampião foi o líder cangaceiro mais famoso do Brasil. Foi morto e decapitado após emboscada em 1938. O Dr. José Lages Filho, perito médico-legal da polícia de Alagoas, realizou a autópsia parcial, restrita à cabeça. O exame focalizou essencialmente a busca de traços físicos característicos do chamado criminoso nato, de acordo com a teoria antropológica criminal desenvolvida pelo psiquiatra italiano Cesare Lombroso. A doutrina de Lombroso e outras com ela relacionadas influenciaram fortemente o raciocínio médico e político na primeira metade do século 20. Seus ecos são ainda hoje perceptíveis em estudos genéticos e neurocientíficos contemporâneos, que seguem procurando as raízes biológicas dos desvios comportamentais e da criminalidade.

Solid anaerobic digestion: State-of-art, scientific and technological hurdles.

In this paper, a state-of-art about solid anaerobic digestion (AD), focused on recent progress and trends of research is proposed. Solid anaerobic digestion should be the most appropriate process for degradation of by-products with high total solid (TS) content, especially lignocellulosic materials like agricultural waste (straw, manure), household waste and food waste. Solid AD is already widely used in waste water treatment plant for treating plant for sewage sludge but could be more developed for lignocellulosic materials with high TS content. Many research works were carried out in Europe on solid AD, focused on current hurdles (BMP, codigestion, inhibition, microbial population, rheology, water transfers, inoculum, etc.) in order to optimize the solid AD process. In conclusion, hurdles of solid AD process should and must be solved in order to propose better productivity and profitability of such system operating with high TS content (>15%), favouring reliable industrial processes.

Endothelial dysfunction in patients with coronary artery disease: insights from a flow-mediated dilation study.

BACKGROUND: The use of flow-mediated dilation (FMD) as a surrogate indicator for the extent of coronary artery disease (CAD) remains largely unknown. We assessed FMD at the brachial artery in 89 consecutive patients undergoing coronary angiography. METHODS AND RESULTS: Patients were classified in groups 0 to 3 according to the number of diseased vessels and the SYNTAX score was calculated. The FMD decreased significantly from groups 0 to 3 (P < .001). There was a significant linear relation between SYNTAX score and FMD (corrected r (2) = .64, P < .001). In multivariate analysis, a reduced FMD was the only significant independent predictor of the presence of CAD (odds ratio [OR] 1.78, P = .032) and of CAD severity (OR 1.85, P = .005). CONCLUSION: This study confirms that FMD is reduced in patients with CAD and that such reduction in FMD is related to the extent of the disease. Therefore, FMD at the brachial artery is likely to represent a reliable indicator of CAD burden.

A simple and rapid one-time method to evaluate the non-acidic gas content from bioprocesses.

This paper presents a rapid less than 2 min and low-cost method involving the use of alkali solution to capture the acidic gasses from a biogas, thereby providing an estimate of the percentage of non-acidic gasses. Such a method was mentioned in the literature but never fully described or optimized. After sampling an aliquot of gas from bioprocess, gas was injected in a sealed flask with a 3 M NaOH solution, and after equilibrium was obtained, the non-acidic gas volume was measured. The method was first calibrated with certified gasses with an accuracy observed between 98 and 105%. Regarding the validation step, certified standard gas mixtures and nine biogas-laboratory batch reactors were used, the overall accuracy reported was 103 + 3%. This rapid and low-cost method may either be used in laboratory conditions as a quick and low cost alternative to standard analysis equipment or in addition as a routine field control method used on full-scale plants.