Time filter

Source Type

Beneke D.L.,David Beneke Consulting Pty. Ltd. | Thumkunta J.R.,Research and Development Manager | Koen D.J.,Analyst
Practice Periodical on Structural Design and Construction | Year: 2011

Rotationally molded polyethylene water storage tanks have been produced since the 1950s when the technology became available for this manufacturing process. For circular tanks manufactured in this way, the traditional method of design has been based on hand calculations considering internal hydrostatic pressure from the stored liquid as the primary applied load. This study presents the results of the optimal structural design of 16 circular polyethylene water tanks of various sizes. Based on the results derived, optimal design recommendations for these tank structures are provided when both hydrostatic pressure and wind loads are applied. © 2011 American Society of Civil Engineers.

Mccall W.,Geoprobe Systems Inc. | Christy T.M.,Geoprobe Systems Inc. | Pipp D.,Geoprobe Systems Inc. | Terkelsen M.,Research and Development Manager | And 3 more authors.
Groundwater Monitoring and Remediation | Year: 2014

The Membrane-Interface Probe and Hydraulic Profiling Tool (MiHpt) is a direct push probe that includes both the membrane interface probe (MIP) and hydraulic profiling tool (HPT) sensors. These direct push logging tools were previously operated as separate logging systems for subsurface investigation in unconsolidated formations. By combining these two probes into one logging system the field operator obtains useful data about the distribution of both volatile organic contaminants (VOCs) and relative formation permeability in a single boring. MiHpt logging was conducted at a chlorinated VOC contaminated site in Skuldelev, Denmark, to evaluate performance of the system. Formation cores and discrete interval slug tests are used to assess use of the HPT and electrical conductivity (EC) logs for lithologic and hydrostratigraphic interpretation. Results of soil and groundwater sample analyses are compared to the adjacent MiHpt halogen specific detector (XSD) logs to evaluate performance of the system to define contaminant distribution and relative concentrations for the observed VOCs. Groundwater profile results at moderate to highly contaminated locations were found to correlate well with the MiHpt-XSD detector responses. In general, soil sample results corresponded with detector responses. However, the analyses of saturated coarse-grained soils at the site proved to be unreliable as demonstrated by high RPDs for duplicate samples. The authors believe that this is due to pore water drainage observed from these cores during sampling. Additionally, a cross section of HPT pressure and MiHpt-XSD detector logs provides insight into local hydrostratigraphy and formation control on contaminant migration. Groundwater Monitoring & Remediation © 2014, National Ground Water Association.

Perumal D.,Research Fellow | Niederer R.,Corneal Research Fellow | Raynel S.,Research and Development Manager | McGhee C.N.J.,University of Auckland
New Zealand Medical Journal | Year: 2011

Background To establish demographics, referral patterns and clinical characteristics of patients attending an emergency eye service within a major public tertiary teaching hospital and to identify possible targets to improve delivery of patient care. Methods Retrospective study of all patients (N=504) attending an acute eye clinic over a representative 2-week period within Greenlane Clinical Centre, Auckland. Results Mean age was 42.4±20.6 years with mean visual acuity of 6/10. Referrals came from: general-practitioners (GP) (26.2%), self-referrals (18.6%), hospital medical-officers (7.4%), accident and emergency clinics (6.6%) and optometrists (2.2%). 39.1% of patients were follow-up reviews. Main presenting symptoms were pain, red eye and reduced vision. Average waiting-time was 119±98 min. Major diagnoses were trauma, uveitis and adenoviral keratoconjunctivitis (AKC). Males were more likely to present with ocular trauma, whereas females were more likely to exhibit uveitis, contact-lens related keratitis and AKC. Outcomes included follow-up (48.2%), referral to speciality ophthalmology care (19.0%), referral to other clinics (5.75%), and discharge (33.7%). Conclusion A significant proportion of presentations could have been appropriately referred to outpatient departments or potentially managed by primary healthcare providers. Potential initiatives to manage excessive workload demands might target prevention of ocular trauma, improved contact-lens education, limiting the spread of AKC and improved GP education. © NZMA.

Owens C.,University of Exeter | Darvill R.,University of Exeter | Emmens T.,Research and Development Manager | Hewis E.,Independent expert by experience and healthcare | Aitken P.,R and D Devon Partnership NHS Trust
Health Expectations | Year: 2011

Objective To engage a group of people with relevant lived experience in the development of a text-messaging intervention to reduce repetition of self-harm. Background Contact-based interventions, such as follow-up letters, postcards and telephone calls, have shown potential to reduce repetition of self-harm in those who present at Accident and Emergency departments. Text messaging offers a low-cost alternative that has not been tested. We set out to develop a text-based intervention. The process of intervention development is rarely reported and little is known about the impact of service user involvement on intervention design. Method We held a series of six participatory workshops and invited service users and clinicians to help us work out how to get the right message to the right person at the right time, and to simulate and test prototypes of an intervention. Results Service users rejected both the idea of a generic, 'one size fits all' approach and that of 'audience segmentation', maintaining that text messages could be safe and effective only if individualized. This led us to abandon our original thinking and develop a way of supporting individuals to author their own self-efficacy messages and store them in a personal message bank for withdrawal at times of crisis. Conclusions This paper highlights both the challenge and the impact of involving consumers at the development stage. Working with those with lived experience requires openness, flexibility and a readiness to abandon or radically revise initial plans, and may have unexpected consequences for intervention design. © 2010 Blackwell Publishing Ltd.

Pedro S.,Long Term R and D | Karin E.,Research and Development Manager | Raquel V.,Product Manager Thermic | Alain L.,Marketing Manager
Industrie Textile | Year: 2010

So, if food can be seen as the fuel that maintains the fire within us - and the fuel serves only to prepare that ailment or to raise the body heat as external additive - shelter and clothes serve only for keeping the generated or absorbed body heat." Walden or life in the woods - Henry D. Thoreau. So, without a doubt, energy is a key issue in our lives.

Almeida L.E.N.,Research and Development Manager | Almeida L.E.N.,Aeronautical Institute of Technology | Martins A.F.,Research and Development Manager | Martins A.F.,Aeronautical Institute of Technology | And 4 more authors.
49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference | Year: 2013

The thermal decomposition kinetics of ammonium perchlorate (AP)/hydroxyl-terminated-polybutadiene (HTPB) samples, the AP/Al/HTPB solid propellant, with Iron Oxide burning rate catalyst at nano and micro scale were studied by thermal analysis techniques at different heating rates curves in dynamic nitrogen atmosphere. The exothermic reaction kinetics was studied by differential scanning calorimetry (DSC) curves in isothermal conditions. The Arrhenius kinetics parameters were obtained by Flynn-Wall and Ozawa method. The Kissinger and Starink kinetics method was also used for obtaining the activation energy value for a comparison purpose. The propellant samples thermal decomposition was studied simultaneously by thermogravimetric and differential thermal analysis (TG-DTA). For this purpose solid propellant grains containing nano and micro scale iron oxide were formulated. The comparison was made with a solid propellant grain formulated without burn rate catalyst additive. The effect of catalysts on the propellant burning rate and the propellant initiation sensitivity were also evaluated by friction and impact. The effect of the catalyst in the propellant binder reaction was evaluated by viscosity and mechanical properties. Scanning electron microscopy with Energy dispersive analysis (SEM/EDS) techniques was used to evaluate the iron oxide morphology. Three bench firing tests were performed with rockets motor in order to konw the ballistics parameters.

Loading Research and Development Manager collaborators
Loading Research and Development Manager collaborators