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How to develop an automated system to monitor the RF characterisation of radios
No full textEmpirical thesis.Bibliography: page 49.1. Introduction -- 2. Background theory -- 3. Manual test measurements and results -- 4. Setting up a remote connection -- 5. Automated tests -- 6. Conclusion --7. Abbreviations -- Bibliography -- Appendices.A radio frequency (RF) device is a small elctronic device that is used to transmit and/or receive electronic signals such as a walkie talkie. it has a base station that relays electronic signals 9ie microwaves). It is mainly composed of two different components. One of them is a receiver end module and the other is a transmitter module. This paper consists of the work done with the receiver module and different tests that have been conducted from the instruction manual provided by RF Technology.This paper discusses the steps that involve creating a process of automated tests which are required to configure the receiver module of the RF device. Currently, these tests are carried out manually and are very time-consuming and prone to human errors. Therefore, to save time and avoid human errors, automation of these tests is highly essential. This in turn will give faster and more accurate results. The following section in this paper discusses the outcome of this project and highlights the problems and hurdles faced and the solutions devised.Mode of access: World wide web.1 online resource (xiii, 53, [19] pages colour illustrations
Bonding structure and mineral analysis of size resolved atmospheric particles nearby steelmaking industrial sites in Australia
No full textComprehensive understanding of organic and inorganic compounds in atmospheric particles of different size fractions ranging from coarse to ultrafine is essential for assessment of the impact of particles on the radiation balance. In this work the size resolved atmospheric particles were collected in the vicinity of three iron and steelmaking sites and one urban background site in Australia using an eight staged micro orifice uniform deposit impactor (MOUDI) sampler. The sampled particles were assessed using FTIR technique to determine the dominant functional groups, and XRD technique for determining the mineral content of the inorganic compounds. This study revealed variable distributions between and among bonding groups in urban and industrial areas. The hydroxyl (–OH) group (in alcohol compounds, surface OH on crystals, salt hydrate), aliphatic carbon (–CH₂) group (in methylene compounds, n-alkane), carbonyl (–CO) group (in acid halide, aryl carbonate, ketone, conjugated ketone), and amino (–NH₂) group (in primary amino compounds such as n-butylamine) in atmospheric particles were identified and most likely originated from combustion processes (industrial, transport, and domestic), sea spray, long range transport particles, and secondary organic particles sources nearby industrial and urban areas. Hematite mineral in the inorganic fraction of the atmospheric particles was found predominantly in the vicinity of the iron and steelmaking industries, which most likely originates from raw materials handling and process emissions.13 page(s
Z-FIRE : ISM properties of the z=2.095 COSMOS cluster
No full textWe investigate the ISM properties of 13 star-forming galaxies within the z ~ 2 COSMOS cluster. We show that the cluster members have [N II]/Hα and [O III]/Hβ emission-line ratios similar to z ~ 2 field galaxies, yet systematically different emission-line ratios (by ~0.17 dex) from the majority of local star-forming galaxies. We find no statistically significant difference in the [N II]/Hα and [O III]/Hβ line ratios or ISM pressures among the z ~ 2 cluster galaxies and field galaxies at the same redshift. We show that our cluster galaxies have significantly larger ionization parameters (by up to an order of magnitude) than local star-forming galaxies. We hypothesize that these high ionization parameters may be associated with large specific star formation rates (SFRs; i.e., a large SFR per unit stellar mass). If this hypothesis is correct, then this relationship would have important implications for the geometry and/or the mass of stars contained within individual star clusters as a function of redshift.10 page(s
The Marginal role of West New Guinea in the Unitary Indonesian Project : a historical perspective
No full text21 page(s
Cortical reorganisation during a 30-week tinnitus treatment program
No full textSubjective tinnitus is characterised by the conscious perception of a phantom sound. Previous studies have shown that individuals with chronic tinnitus have disrupted sound-evoked cortical tonotopic maps, time-shifted evoked auditory responses, and altered oscillatory cortical activity. The main objectives of this study were to: (i) compare sound-evoked brain responses and cortical tonotopic maps in individuals with bilateral tinnitus and those without tinnitus; and (ii) investigate whether changes in these sound-evoked responses occur with amelioration of the tinnitus percept during a 30-week tinnitus treatment program. Magnetoencephalography (MEG) recordings of 12 bilateral tinnitus participants and 10 control normal-hearing subjects reporting no tinnitus were recorded at baseline, using 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz tones presented monaurally at 70 dBSPL through insert tube phones. For the tinnitus participants, MEG recordings were obtained at 5-, 10-, 20- and 30- week time points during tinnitus treatment. Results for the 500 Hz and 1000 Hz sources (where hearing thresholds were within normal limits for all participants) showed that the tinnitus participants had a significantly larger and more anteriorly located source strengths when compared to the non-tinnitus participants. During the 30-week tinnitus treatment, the participants’ 500 Hz and 1000 Hz source strengths remained higher than the non-tinnitus participants; however, the source locations shifted towards the direction recorded from the non-tinnitus control group. Further, in the left hemisphere, there was a time-shifted association between the trajectory of change of the individual’s objective (source strength and anterior-posterior source location) and subjective measures (using tinnitus reaction questionnaire, TRQ). The differences in source strength between the two groups suggest that individuals with tinnitus have enhanced central gain which is not significantly influenced by the tinnitus treatment, and may result from the hearing loss per se. On the other hand, the shifts in the tonotopic map towards the non-tinnitus participants’ source location suggests that the tinnitus treatment might reduce the disruptions in the map, presumably produced by the tinnitus percept directly or indirectly. Further, the similarity in the trajectory of change across the objective and subjective parameters after time-shifting the perceptual changes by 5 weeks suggests that during or following treatment, perceptual changes in the tinnitus percept may precede neurophysiological changes. Subgroup analyses conducted by magnitude of hearing loss suggest that there were no differences in the 500 Hz and 1000 Hz source strength amplitudes for the mild-moderate compared with the mild-severe hearing loss subgroup, although the mean source strength was consistently higher for the mild-severe subgroup. Further, the mild-severe subgroup had 500 Hz and 1000 Hz source locations located more anteriorly (i.e., more disrupted compared to the control group) compared to the mild-moderate group, although this was trending towards significance only for the 500Hz left hemisphere source. While the small numbers of participants within the subgroup analyses reduce the statistical power, this study suggests that those with greater magnitudes of hearing loss show greater cortical disruptions with tinnitus and that tinnitus treatment appears to reduce the tonotopic map disruptions but not the source strength (or central gain).18 page(s
GoPros™ as an underwater photogrammetry tool for citizen science
No full textCitizen science can increase the scope of research in the marine environment; however, it suffers from necessitating specialized training and simplified methodologies that reduce research output. This paper presents a simplified, novel survey methodology for citizen scientists, which combines GoPro imagery and structure from motion to construct an ortho-corrected 3D model of habitats for analysis. Results using a coral reef habitat were compared to surveys conducted with traditional snorkelling methods for benthic cover, holothurian counts, and coral health. Results were comparable between the two methods, and structure from motion allows the results to be analysed off-site for any chosen visual analysis. The GoPro method outlined in this study is thus an effective tool for citizen science in the marine environment, especially for comparing changes in coral cover or volume over time.18 page(s
Folktale transmission in the Arctic provides evidence for high bandwidth social learning among hunter-gatherer groups
No full textThere exist striking resemblances in the stories of ethnolinguistic groups separated by vast geographic distances, with nearby groups having the most in common. The causes of these geographic associations are uncertain. Here we use method and theory from population genetics to examine cultural transmission in folktale inventories of 18 hunter-gatherer groups spread across 6000 km of Siberia, Alaska, Canada, and Greenland. We find that linguistic relatedness and geographic proximity independently predict overlap in folktale inventories, which provides evidence for both vertical transmission down cultural lineages and horizontal transmission between groups. These results suggest that high-bandwidth social learning across group boundaries is a feature of traditional hunter-gatherers, which may help explain how complex cultural traditions can develop and be retained in ostensibly small groups.7 page(s
Reading aloud as performance and its representation on television programmes for children
No full textThe social practice of reading aloud picture books to children, or shared reading, has been represented on many televisions programmes broadcast across English-speaking countries. This article views shared reading as a performance, and explores its transformation on two television shows for children and the potential of such shows to promote reading engagement and literacy development. Taking a critical multimodal perspective, we analyse shared reading in real life and on television as a social practice, focusing on the ways the participants talk about the picture book, relate it to exterior texts or activities, and legitimise shared reading through the employment of multimodal and interactive strategies. The analysis reveals significant differences between actual adult–child shared reading and its representation on television. The comparison illustrates the potential benefits and limitations of television shows in which picture books are read to the viewer, in terms of promoting shared reading among families and supporting young children’s emergent literacy development.21 page(s
Comparative analysis of membrane vesicles from three Piscirickettsia salmonis isolates reveals differences in vesicle characteristics
No full textMembrane vesicles (MVs) are spherical particles naturally released from the membrane of Gram-negative bacteria. Bacterial MV production is associated with a range of phenotypes including biofilm formation, horizontal gene transfer, toxin delivery, modulation of host immune responses and virulence. This study reports comparative profiling of MVs from bacterial strains isolated from three widely disperse geographical areas. Mass spectrometry identified 119, 159 and 142 proteins in MVs from three different strains of Piscirickettsia salmonis isolated from salmonids in Chile (LF-89), Norway (NVI 5692) and Canada (NVI 5892), respectively. MV comparison revealed several strain-specific differences related to higher virulence capability for LF-89 MVs, both in vivo and in vitro, and stronger similarities between the NVI 5692 and NVI 5892 MV proteome. The MVs were similar in size and appearance as analyzed by electron microscopy and dynamic light scattering. The MVs from all three strains were internalized by both commercial and primary immune cell cultures, which suggest a potential role of the MVs in the bacterium's utilization of leukocytes. When MVs were injected into an adult zebrafish infection model, an upregulation of several pro-inflammatory genes were observed in spleen and kidney, indicating a modulating effect on the immune system. The present study is the first comparative analysis of P. salmonis derived MVs, highlighting strain-specific vesicle characteristics. The results further illustrate that the MV proteome from one bacterial strain is not representative of all bacterial strains within one species.27 page(s