2,253 research outputs found
Performance and test section flow characteristics of the National Full-Scale Aerodynamics Complex 40- by 80-foot wind tunnel
Results from the performance and test section flow calibration of the 40- by 80-Foot Wind Tunnel are presented. A flow calibration test was conducted in May and June 1987. The goal of the flow calibration test was to determine detailed spatial variations in the 40- by 80-ft test section flow quality throughout the tunnel operational envelope. Data were collected for test section speeds up to 300 knots and for air exchange rates of 0, 5, and 10 percent. The tunnel performance was also calibrated during the detailed mapping of the test section flow field. Experimental results presented indicate that the flow quality in the test section, with the exception of temperature, is relatively insensitive to the level of dynamic pressure and the air exchange rate. The dynamic pressure variation in the test section is within + or - 0.5 deg at all test section velocities. Cross-stream temperature gradients in the test section caused by the air exchange system were documented, and a correction method was established. Streamwise static pressure variation on the centerline is about 1 percent of test section dynamic pressure over 30 ft of the test section length
An evaluation of Te Rau Puawai workforce 100: Stakeholder perspectives
To evaluate the Te Rau Puawai programme, the Ministry of Health commissioned the
Maori and Psychology Research Unit of the University of Waikato in July 2001. The
overall aim of the evaluation was to provide the Ministry with a clearer understanding
of the programme including: the perceived critical success factors, the barriers if any
regarding Te Rau Puawai, the impact of the programme, the extent to which the
programme may be transferable, gaps in the programme, and suggested
improvements.
There are a number of stakeholders who do not have a direct role in the provision of
Te Rau Puawai. These people are not involved in the day to day running of Te Rau
Puawai (as do, for example, the coordinator, support team or academic mentors),
nevertheless they play an important role, contributing in a variety of ways to the
programme
2015 Annual Research Report: Greater Sage-grouse Habitat Use Patterns and Vital Rates in the Morgan-Summit Sage-grouse Management Area: Conservation Implications for Managers
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Integrated starter alternator sizing for micro / mild hybrid vehicle using Monte Carlo simulation
The Integrated Starter Alternator (ISA) needs to cater for a very wide range of torque and speed, in both motor and generator modes and in different functionalities, such as engine starting, alternator, regenerative braking and torque boost. Furthermore, each of these functionalities, being dependent on the drive cycle, means that determining the optimal ISA torque-speed characteristics is a challenging problem. In this paper, a Monte-Carlo simulation has been reported to find the most frequently operated regions in the torque-speed plane of an ISA, using stochastic drive cycles. This has been used to determine the optimal torque-speed characteristic to inform the ISA design specification. In turn, this gives a more robust coverage of different driving patterns compared to a conventional driving cycle-based design.Commonwealth Scholarship Commissio
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Independent Phase Belt Controlled Phase Pole Modulated Induction Machine for Integrated Starter Alternator Application
Integrated Starter Alternators for micro and mild
hybrid vehicles require wide torque-speed characteristics. This
paper reports a Phase Pole Modulated (PPM) Induction Machine
(IM) to achieve wide torque-speed characteristics by implementing
different pole pair combinations in a single machine. A novel
concept of independent phase belt control technique has been
reported in detail, which allows higher flexibility than the phase
pole modulated machines reported in previous literature. In this
design study a 12 leg inverter has been used to achieve 2/4/6/8/10
pole configurations of a single machine. This design reports the
possibility of removing the constraint of the magnetic space phase
angle difference between two consecutive phase belts of a machine
to be a submultiple of or even 2 , which in turn allows
fractional slots/pole for an induction machine. The proposed
design has been validated using two-dimensional finite element
analysis (2D FEA). Further, analytic expressions for equivalent
circuit parameters of this proposed machine have been reported
as well, which have been verified against FEA results
Project Spraoi: Dietary Intake, Nutritional Knowledge, Cardiorespiratory Fitness and Health Markers of Irish Primary School Children
Objective: Examine dietary intake (DI), anthropometric measures, cardiorespiratory fitness (CRF) and nutritional knowledge (NK) of school children.Design: Cross-sectional study. Food Diary, NK questionnaire and 550m walk/run test were used to assess DI, NK and CRF respectively. Blood pressure (BP) was also taken and body mass index (BMI) and waist to height ratio (WHtR) were calculated.Setting: Two primary schools, Cork, Ireland. Subjects: Six (n = 49, age 5.9 ± 0.6 years) and ten (n = 52, age 9.8 ± 0.5 years) year olds.Results: Intakes of fruit and vegetables, fibre, calcium and iron were sub-optimal. Unhealthy snacks and saturated fat intakes were higher than recommended. A total of 24.4% of six year olds and 35.4% of ten year olds were classified as ‘fast’. Furthermore, 45.9% of six and ten year olds had high-normal BP and 27.9% had high BP. NK was negatively correlated with sugar intake (r = -0.321, p = 0.044) in ten year olds. WHtR was negatively correlated with servings of vegetables in six year olds (r = -0.377, p = 0.014). For ten year olds, there was a positive correlation between WHtR and run score (r = 0.350, p = 0.014) and BMI and run score (r = 0.482, p = 0.001).Conclusion: This study highlights, for the first time, DI, NK, CRF, BP and anthropometric data for Irish children and their potential combined effect on overall health. Study results suggest preventive initiatives are needed, in children as young as 6 years of age
(4S,5S)-2,2-Dimethyl-4,5-bis(3-methyl-2-thioxo-2,3-dihydro-1H-imidazol-1-ylmethyl)-1,3-dioxolane
In the chiral title compound, C15H22N4O2S2, there are two molecules in the asymmetric unit with distinctly different conformations, as quantified by torsion angles. The dihedral angles between the thioimidazole rings are 81.59 (5) and 67.04 (4)°. One molecule exhibits local twofold rotation symmetry, while the other displays no local symmetry. Intermolecular C—H⋯O and C—H⋯S interactions are observed
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Benefits of the Coupled Inductors Combined Cuk-SEPIC (CI-CCS) Converter
An enhanced DC-DC converter is proposed in this paper,
based on the combination of the Cuk and SEPIC converters.
This converter uses a single switching node which is common
to both Cuk and SEPIC energy transfer stages. The converter
uses only one switch, yet provides dual outputs in the form of
a bipolar DC bus with a common ground. Since the switch is
grounded, a simple, non-isolated gate driver may be used. The
proposed converter uses integrated magnetics cores to couple
the input and output inductors, which significantly reduces the
input current ripple. The new converter is referred to as the
Coupled Inductors Combined Cuk-SEPIC (CI-CCS) converter
Hydroxonium triaquabis(biuret-κ2 O,O′)dichloridolanthanum(III) dichloride dihydrate
In the title compound, (H3O)[LaCl2(C2H5N3O2)2(H2O)3]Cl2·2H2O, the La atom is bonded to seven O atoms (arising from two O,O′-bidentate biuret molecules and three water molecules) and two chloride ions in an irregular arrangement. A network of N—H⋯O, N—H⋯Cl, O—H⋯O and O—H⋯Cl hydrogen bonds helps to establish the packing, leading to a three-dimensional network. The La atom, one Cl atom and four O atoms lie on a crystallographic mirror plane
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