Charge transfer complexes and radical cation salts of chiral methylated organosulfur donors

The single crystal X-ray structure of the all-axial conformer of the (R,R,R,R) enantiomer of the chiral donor tetramethyl-BEDT-TTF (TM-BEDT-TTF) was described and compared to the all-equatorial conformer. (S,S,S,S)-Tetramethyl-BEDT-TTF formed crystalline 1 : 1 complexes with TCNQ and TCNQ-F4, as well as a THF solvate of the TCNQ complex. Donors bis((2S,4S)-pentane-2,4-dithio)tetrathiafulvalene and (ethylenedithio)((2S,4S)-pentane-2,4-dithio)tetrathiafulvalene, which contain seven-membered rings bearing chirally oriented methyl groups, only formed complexes with TCNQ-F4. The TCNQ-F4 complexes contain planar organosulfur systems, in contrast to the TCNQ complexes in which there is minimal charge transfer. A variety of crystal packing modes were observed. Electrocrystallization experiments with both enantiomers and the racemic form of tetramethyl-BEDT-TTF afforded mixed valence radical cation salts with the AsF6 and SbF6 anions formulated as (TM-BEDT-TTF)2XF6 (X = As, Sb). Electrical conductivity was only found in one charge transfer complex, while the radical cation salts are all semiconducting

About the parabolic relation existing between the skewness and the kurtosis in time series of experimental data

In this work we investigate the origin of the parabolic relation between skewness and kurtosis often encountered in the analysis of experimental time-series. We argue that the numerical values of the coefficients of the curve may provide informations about the specific physics of the system studied, whereas the analytical curve per se is a fairly general consequence of a few constraints expected to hold for most systems.Comment: To appear in Physica Script

Glucose Inhibition of Cellulose Synthesis by Pyrenochaeta terrestris

The rate of synthesis of Pyrenochacta terrestris cellulase was determined on the substrates of glucose, cellulose, and cellulose + glucose. Enzyme production was rapid on cellulose, almost negligible on glucose, and intermediate on cellulose + glucose. On the latter substrate, cellulase appeared after the near exhaustion of glucose. The authors suggest that extremely low concentrations of soluble carbohydrate regulate cellulase synthesis

Environmental monitoring report for Pantex Plant covering 1977

During 1977 Pantex Plant conducted a monitoring program to determine the concentration of specific radioactive and non-radioactive species in the local environment. Although the plant activities involve the handling of significant quantities of uranium, plutonium, and tritium, only small releases of uranium (depleted in the isotope /sup 235/U) and tritium occurred which could have affected the local environment. Monitoring data indicate that concentrations of these nuclides in the environment are below established criteria for air and water and therefore should not present a health hazard either to employees or to the public. Nonradioactive emissions were also well below prescribed standards and constituted no health hazard

Microturbulence studies in RFX-mod

Present-days Reversed Field Pinches (RFPs) are characterized by quasi-laminar magnetic configurations in their core, whose boundaries feature sharp internal transport barriers, in analogy with tokamaks and stellarators. The abatement of magnetic chaos leads to the reduction of associated particle and heat transport along wandering field lines. At the same time, the growth of steep temperature gradients may trigger drift microinstabilities. In this work we summarize the work recently done in the RFP RFX-mod in order to assess the existence and the impact upon transport of such electrostatic and electromagnetic microinstabilities as Ion Temperature Gradient (ITG), Trapped Electron Modes (TEM) and microtearing modes.Comment: Work presented at the 2010 Varenna workshop "Theory of Fusion Plasmas". To appear in Journal of Physics Conference Serie

Reaching expert consensus on training different cadres in delivering early childhood development: technical report

The Sustainable Development Goals (SDGs) signal a greater focus on inter-sectoral, collaborative approaches to ensuring that all human beings can fulfil their potential in dignity and equality. This is reflected in the current global concern with promotion of holistic, community-based programmes to support early childhood development and wellbeing ? widely referred to as ?early childhood development? (ECD). Within this context, the study reported here sought to achieve consensus among 14 global experts on training needs for three groups of personnel (?cadres?) involved in delivery of early childhood development (ECD) programmes. The three cadre groups, identified via a comprehensive review of literature on current issues in the provision of ECD, comprise delivery of education, health and community-based early childhood interventions across a diverse range of low resource settings. The study responds to a gap in knowledge on training needs for ECD cadres, associated with a serious dearth of human resources to support provision of ECD services. Key challenges reported here, based on comprehensive review of available literature, include: 1. A long-running, severe global shortage in availability of cadres to support delivery of ECD programmes. 2. To date, delivery of key health and education interventions principally in siloes, with limited integration and practitioners/professionals/para-professionals widely employed in vertical programmes. 3. Low professional and social status of many ECD cadres, due to a lack of systematic recognition and support. This has resulted in large numbers of cadres with undefined career paths, and high rates of turnover / attrition2. In response, expert consensus points to the following potential strategies for enhancing provision of ECD cadres training and professional development: 1. Development of coherent systems to support ECD training and professional development. a. Findings indicate consensus around commonalities among and distinctions between essential skills and knowledge required for education professionals, health professionals and non-certified para-professional groups. These insights could provide a basis for establishing coherent, joined-up professional pathways and support systems for development of ECD cadres. b. Consensus around the respective roles of these three cadres is reflected in the distinct training needs outlined for each group. There is consensus that, while noncertified para-professionals require programme-specific training to facilitate delivery of particular tasks, certified education and health professionals require training in more advanced skills such as problem-solving and flexibility. Exposure to a range of different programmes and approaches is required for certified professionals, to facilitate informed decision making around programme development and adapting / responding to local contextual needs. These distinctions could provide a basis for establishing clarity in respective roles for ECD cadres with regard to programme delivery. c. Consensus around training needs across cadre groups is indicated, in particular the need for on-going mentoring and supervision. While there is acknowledgment among experts about complexities associated with provision of on-going support, consensus around this component of training was strongest among all aspects surveyed. This reflects widespread concern among participating experts, as well as within the literature, that short-term training for ECD cadres must be followed up with opportunities for continuing professional development and systematic support, to facilitate sustained effective practice. 2. Within systems for ECD cadres training, a strong focus on the importance of contextually grounded programmes, materials / resources and strategies for implementation. a. There is strong consensus that ECD cadres training should be contextually-grounded to ensure responsive, effective provision. Training should be based on and promote careful consideration of a range of factors that shape provision of ECD, including but not restricted to, policy, budgets, available resources, local values, beliefs and practices. 3. Adoption of the concept of nurturing care as an underpinning principle for provision of ECD cadres training. a. Delphi findings indicate consensus around essential dispositions, or attitudes, required to support caring, respectful, responsive and trustful interactions with children, caregivers and communities. They also indicate that all cadres require knowledge and skills in promoting early stimulation; child-centred learning and development; effective communication and collaboration; problem solving, and reflective practice. These strategies are outlined in the proposed framework provided below, which identifies unique roles / training needs for different cadre groups, as well as opportunities for enhancing integration across ECD cadres training systems. 3 Experts suggest that these ?dispositions?, which are essential for effective provision, should be viewed as malleable. Training should work / be designed to promote, model and strengthen these characteristics

An international perspective. A survey of clinician views and practices from 16 countries

Objective: To gain an insight into speech and language therapists’ perspectives and practices on quality of life in aphasia. Participants and Methods: The International Association of Logopedics and Phoniatrics Aphasia Committee developed a survey questionnaire, which was delivered on-line, anonymously, through SurveyMonkey (November 2012 – April 2013) to clinicians working with people with aphasia in 16 countries across the world. Results: A large number of speech and language therapists responded to the survey, with 19/21 questions answered by 385 – 579 participants. Clinicians were well informed on what constitutes quality of life and viewed it as a complex construct influenced by health, participation, in/dependence, communication, personal factors, and environmental factors. In their clinical practice, they considered quality of life as important, used informal approaches to explore it and aimed to address quality of life goals; yet the majority did not evaluate quality of life in a systematic way. Conclusion: There is a need for training on quality of life to facilitate speech and language therapists to incorporate quality of life outcome measures in their interventions. There is also a need for further research on what interventions improve quality of life in aphasia

Beat-wave generation of plasmons in semiconductor plasmas

It is shown that in semiconductor plasmas, it is possible to generate large amplitude plasma waves by the beating of two laser beams with frequency difference close to the plasma frequency. For narrow gap semiconductors (for example n-type InSb), the system can simulate the physics underlying beat wave generation in relativistic gaseous plasmas.Comment: 11 pages, LaTex, no figures, no macro