1,988 research outputs found
Letter from M.W. Willis to William Greenleaf Eliot
No full texthttps://rdc.reed.edu/v1/resources/3ac4035d-ef40-47b9-a757-4ab4d27b21eb/thumb/128.jpgThis letter is written on Missouri State Board of Immigration letterhead
An investigation of crack growth behaviour under creep-fatigue condition
No full textAn investigation has been carried out on short crack growth behaviour of AISI type 316 stainless steel under creep-fatigue conditions at 550oC for high strain ranges of 0.9-2.5% and 60 minutes hold time using a high temperature reverse bending rig. The analysis revealed the dominant failure characteristics to be the individual initiation and growth behaviour of many minor cracks in Stage I, and their subsequent coalescence in Stage II. Increasing the strain range increases the number of minor cracks and promotes the process of minor crack coalescence. Predominantly intergranular long cracks are found to form under tensile stresses and transgranular the Langdon Symposium the Langdon Symposium the Langdon Symposium the Langdon Symposium short cracks under compressive stresses
An effective method to investigate short crack growth behaviour by reverse bending testing
No full textA reverse bending rig has the advantage of relatively cheap construction compared with servo-controlled machines, and its robustness and reliability make it ideally suited to long-term testing programmes. In this paper, the details of the mechanical mechanism of a bending rig, the methods of its strain measurement and stress-strain analysis have been presented. A series of tests has been carried out to investigate short crack growth behaviour of AISI type 316 stainless steel under creep-fatigue conditions at 550C. The advantage of this type of test allows a comparison to be made, on one specimen, of the influence of both tensile and compressive hold periods on crack growth behaviour. It has been shown that predominantly intergranular long cracks form on the tensile side and transgranular short cracks on the compressive side and these are a prominent feature between 0.9 – 2.5% strain range
Assessment of tertiary reed beds in chemically-dosed wastewater treatment plants for phosphorus removal
No full textEutrophication is one of the problems affecting the environmental quality standards of fresh waters. Phosphorus (P) is considered a main nutrient contributing to this. In the UK, the Water Industry is responsible for c. 50% of the total phosphorus load to freshwater ecosystems. Within this, small wastewater treatment plants (WwTPs) (<2,000 population equivalent) have a significant role since they represent 75% of all WwTPs in the UK.
The current option for P removal from wastewater is chemical precipitation through the dosing of iron (Fe) salts in combination with a tertiary filtration treatment step. This study aims to determine the transformation processes whereby tertiary reed beds permanently store or release iron and phosphorus in chemically-dosed sites to provide recommendations regarding the conditions where reed beds can be used as such final filtration treatment in small WwTPs. This was carried out through sampling campaigns in 14 full-scale tertiary reed beds.
Chemically-dosed WwTPs with tertiary reed beds can perform satisfactorily achieving phosphorus removals above 85% and average P and Fe final effluent concentrations of 0.7 mg P/L and 0.2 mg Fe/L, respectively, both well below consents (2 mg TP/L and 4 mg Fe/L). The majority of the total phosphorus in the reed bed influents was associated to either suspended solids or dissolved fractions, whereas 60¬90% of the effluent TP is in the dissolved form. Occasional episodes of phosphorus release from the reed bed can occur, as evidenced in an increase in soluble reactive phosphorus in the effluent. The main mechanism for trapping of Fe and P in mature beds was settlement of suspended particles, with phosphorus and iron concentrations in the accumulated sludge being up to 55.9 g P/kg dry matter and 246.6 g Fe/kg DM. The removal of particulate pollutants was successful in the reed beds studied, but colloidal and dissolved particles passing through the beds untreated. This could compromise the use of reed beds with future tightening P consents if the current chemical dosing practices are unchanged
Community staff causal attributions about challenging behaviours in people with intellectual disabilities
No full textRecent theoretically-driven models have suggested that care staff causal attributions about challenging behaviours may influence staff intervention behaviour. Previous research on staff attributions has been concerned mainly with institution staff. The present study focused on community staff attributions as compared with those of inexperienced healthcare workers (student nurses). A total sample of 94 participants were asked to rate the likely causes of one of three topographies of challenging behaviour (self-injury, aggression or stereotypy) using 25 attributional items presented in a questionnaire. Results showed that experienced care staff and inexperienced students differed in their views on likely causes of challenging behaviours, although this was not restricted to a single type of causal factor. The experienced staff as a group rated social and emotional variables as likely causes of challenging behaviours. Finally, both experienced and inexperienced participants distinguished between behavioural topographies in terms of their causes. Stereotypy was viewed as a self-stimulatory activity, whilst aggression and self-injury were rated as more likely to be caused by social and emotional factors. The implications of research in this area for staff training and behavioural intervention are outlined. In addition, suggestions for future research are discussed
All the world is bright and fair, skies are wondrous clear [first line]
No full textstrophicpiano and voiceTo Miss Eleanore Kentads on inside front, inside back, and on back covers for M. Witmark & Sons stock3603; M.W. & Sons 7761-4Johns Hopkins University, Levy Sheet Music Collection, Box
148, Item 112Words by Dave Reed, Jr. Music by Ernest R. Ball
All the world is bright and fair, skies are wondrous clear [first line]
No full textstrophicpiano and voiceTo Miss Eleanore Kentads on inside front, inside back, and on back covers for M. Witmark & Sons stock3603; M.W. & Sons 7761-4Johns Hopkins University, Levy Sheet Music Collection, Box
148, Item 112Words by Dave Reed, Jr. Music by Ernest R. Ball
An evaluation of the Phragmites australis reed use by communities neighbouring the Tembe Elephant Park, Maputaland, KwaZulu-Natal, South Africa
No full textDissertation (MSc (Wildlife Management))--University of Pretoria, 2007.The commercial harvesting of Phragmites australis reeds in the Tembe Elephant Park, Maputaland, KwaZulu-Natal was investigated to determine the impact of reed use on the Muzi Swamp. The reed quality in the harvesting areas within the Tembe Elephant Park has deteriorated over time, with the reeds in the harvested areas being by and large shorter and thinner than the reeds in the other areas of the reserve where harvesting is not allowed. The impact of continuous harvesting in combination with the accidental burning of certain areas in the Muzi Swamp was also found to be detrimental to reed production when compared to other treatments. Poor rural communities neighbouring the Tembe Elephant Park are dependant on the reed resource for both income supplementation and for use in the construction of dwellings. Reeds offer a cheaper alternative to the more western building materials, which is of utmost importance in an area where the mean yearly income is around ZAR 6000 per annum. The manufacture of prefabricated reed and forest timber huts by the local reed harvesters in the summer months would facilitate a winter only harvest, which is more beneficial and is integral to the improvement of the long-term reed quality in the Muzi Swamp. In addition, the cost of these proposed prefabricated reed and forest timber huts is approximately one third of the cost of a similar sized hut that is constructed from bricks and cement. Management recommendations for the controlled harvesting area in Muzi Swamp of the Tembe Elephant Park, as well as the section of the Muzi Swamp that is not afforded protection by Ezemvelo KwaZulu-Natal Wildlife, are also presented.Centre for Wildlife Managementunrestricte
Neurofuzzy modelling of fatigue threshold behaviour in Ni-base superalloys
No full textNeurofuzzy algorithms combine pure neural network heuristic modelling with fuzzy logic utilisation of a priori knowledge, providing data efficient and transparent analysis. Such a technique has been employed in this work to model fatigue thresholds in Ni-Base superalloys. Some success has been achieved, and the potential for this technique to become a powerful tool in alloy development has been demonstrated
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