Single-Longitudinal-Mode Brillouin/Erbium Fiber Laser with High Linewidth-Reduction Ratio

published_or_final_versio

The frictional resistance induced by bacterial based biofouling in drainage pipelines

This paper aims at improving the current understanding of bacterial-based biofouling in drainage pipelines. Using a purpose built pipeline facility consisting of a high density polyethylene pipe, biofilms were incubated with synthetic wastewater for 20 days at three steady-state flow regimes. The results obtained have shown that the presence of a biofilm can cause a significant increase in frictional resistance. The magnitude of a biofilm’s frictional resistance is a function of the shear conditions under which the biofilm is incubated. In particular, the lower the conditioning shear, the higher the frictional resistance imparted by the biofilm. This is attributed to the thickness and roughness distribution induced by such conditions, and it serves to highlight the problem of characterizing a biofilm’s effective roughness using a single roughness scale. The study has also supported the earlier funding that the von Kármán constant is non-universal, and is dependent on Reynolds number for biofouled pipes

Differences in client and therapist views of the working alliance in drug treatment

Background - There is growing evidence that the therapeutic alliance is one of the most consistent predictors of retention and outcomes in drug treatment. Recent psychotherapy research has indicated that there is a lack of agreement between client, therapist and observer ratings of the therapeutic alliance; however, the clinical implications of this lack of consensus have not been explored. Aims - The aims of the study are to (1) explore the extent to which, in drug treatment, clients and counsellors agree in their perceptions of their alliance, and (2) investigate whether the degree of disagreement between clients and counsellors is related to retention in treatment. Methods - The study recruited 187 clients starting residential rehabilitation treatment for drug misuse in three UK services. Client and counsellor ratings of the therapeutic alliance (using the WAI-S) were obtained during weeks 1-12. Retention was in this study defined as remaining in treatment for at least 12 weeks. Results - Client and counsellor ratings of the alliance were only weakly related (correlations ranging from r = 0.07 to 0.42) and tended to become more dissimilar over the first 12 weeks in treatment. However, whether or not clients and counsellors agreed on the quality of their relationship did not influence whether clients were retained in treatment. Conclusions - The low consensus between client and counsellor views of the alliance found in this and other studies highlights the need for drug counsellors to attend closely to their clients' perceptions of the alliance and to seek regular feedback from clients regarding their feelings about their therapeutic relationship

Capacity enhancement of virtual-mirror-based multiwavelength Brillouin-Erbium fiber laser.

An enhanced multiwavelength Brillouin-erbium fiber laser with virtual mirror concept is demonstrated. The performance of three linear amplifier schemes is investigated and optimized. Wide tuning range of 39 nm and maximum of nine laser lines are achieved utilizing a 915 nm pump laser at 616 mW pump power

REVIEW: Pete the Cat: I Love My White Shoes

Review of the children\u27s book Pete the Cat: I Love My White Shoes, by Eric Litwin, and illustrated by James Dean

REVIEW: An Angry Drum Echoed: Mary Musgrove, Queen of the Creeks

Review of the young adult biographical novel An Angry Drum Echoed: Mary Musgrove, Queen of the Creeks, by Pamela Bauer Mueller

Youth Work…… the mystery and magic : what could an evidence base for Youth Work look like?

This thesis offers a narrative approach to considering what youth work is, what does and does not constitute youth work and what are the key components that need to be present to legitimise the work with young people as youth work. It questions if youth work even exists in an agreed and definable form and a definition is offered. I have explored and challenged the notion of youth work measurement, curious to understand if youth work can be measured at all, pondering, ethically should we even seek to measure impact and can we ever be sure of the impact of anything on the lives of young people. Specifically addressing the questions: what is youth work’? What is impact, in relation to youth work? Should impact be measured in an ethical way congruent with the principles of youth work? How can we measure the impact of youth work? Participants were either youth workers or worked with young people and respond to questionnaires, interviews and a focus group. A narrative enquiry was used to gather data from books, journals, participants, my own practice and I present this thesis as a story, told in everyday language, honouring the stories I have been privileged to hear. The original intention was to create a ‘tool’ to measure impact, ultimately the tools created are the processes of demonstrating the causal relationship between the youth work activity undertaken and the outcomes and outputs that can be perceived or measured; the stories young people tell ‘fills the gap’. This story tussles with many aspects of youth work, the mystery and the magic alongside measurement, evidence and how best to capture impact, the challenge that emerged is how to record the impact without altering the dynamic and intention. Through reflective practice, review and participant engagement this simply distils to the notion that if youth is to be measured and the impact captured, that it must not jeopardise the relationship between youth worker and young people. Youth work is somewhat mysterious, unique in the individual interactions, but there is the need for a known understanding of what the profession seeks to achieve and the underpinning values and principles. There is indeed magic, this is evident in the stories of those involved. I offer an informed definition of youth work which contributes to the existing literature and that it is the story from practice that fills the causal gap between the activity or intervention and the impact, without the story we cannot know if there is correlation

Youth work… the mystery and magic. What could an evidence base for youth work look like?

This thesis offers a narrative approach to considering what youth work is, what does and does not constitute youth work and what are the key components that need to be present to legitimise the work with young people as youth work. It questions if youth work even exists in an agreed and definable form and a definition is offered. I have explored and challenged the notion of youth work measurement, curious to understand if youth work can be measured at all, pondering, ethically should we even seek to measure impact and can we ever be sure of the impact of anything on the lives of young people. Specifically addressing the questions: what is youth work’? What is impact, in relation to youth work? Should impact be measured in an ethical way congruent with the principles of youth work? How can we measure the impact of youth work? Participants were either youth workers or worked with young people and respond to questionnaires, interviews and a focus group. A narrative enquiry was used to gather data from books, journals, participants, my own practice and I present this thesis as a story, told in everyday language, honouring the stories I have been privileged to hear. The original intention was to create a ‘tool’ to measure impact, ultimately the tools created are the processes of demonstrating the causal relationship between the youth work activity undertaken and the outcomes and outputs that can be perceived or measured; the stories young people tell ‘fills the gap’. This story tussles with many aspects of youth work, the mystery and the magic alongside measurement, evidence and how best to capture impact, the challenge that emerged is how to record the impact without altering the dynamic and intention. Through reflective practice, review and participant engagement this simply distils to the notion that if youth is to be measured and the impact captured, that it must not jeopardise the relationship between youth worker and young people. Youth work is somewhat mysterious, unique in the individual interactions, but there is the need for a known understanding of what the profession seeks to achieve and the underpinning values and principles. There is indeed magic, this is evident in the stories of those involved. I offer an informed definition of youth work which contributes to the existing literature and that it is the story from practice that fills the causal gap between the activity or intervention and the impact, without the story we cannot know if there is correlation