Adapting Fingerprints Within the NSW Police Force: An Historical Examination of the Geographical Barriers and Implications for Rural and Regional Policing

In the 1890s and 1900s, societies in Western nations, and in particular densely populated cities like London and Paris, became overtly concerned with the need to identify ‘habitual criminals’. In response, in 1903, NSW became the first Australian state to develop a designated fingerprint section or bureau within their police force, which, following international trends, was very much focused on metropolitan NSW. According to Cauchi and Knepper (2009), fingerprint technology as a form of criminal identification “was the mark of cosmopolitan police organization” (p. 74). Criminal identification was principally identified as a problem in the rapidly growing cities, and thus, fingerprinting resources were directed to those areas. As a result, for the first few decades of use, fingerprint identification in rural and regional areas was limited. For example, only officers in metropolitan NSW were trained in fingerprint identification and comparison methods, and police around regional NSW were expected to take finger-print exhibits to metropolitan areas for analysis. The limitations in technology available during the initial period of fingerprinting resulted in regional NSW police facing more barriers to the use of fingerprint identification technology than their metropolitan counterparts. To understand these barriers and the limitations of fingerprinting in rural areas, this paper explores the initial introduction of fingerprinting into the NSW Police system from 1903-1930, focusing upon the challenges and barriers experienced by regional police agencies in using what is now one of the most common forensic identification tools available to police worldwide

Quark model predictions for the electron energy spectrum in seileptonic D and B decays

The constituent quark model is used to predict the electron energy spectrum in semileptonic D and B meson decays. Particular attention is paid to the endpoint region of the electron spectrum in B decays since this is crucial to a determination of the b --> u weak mixing angle

Quark model predictions for the electron energy spectrum in seileptonic D and B decays

The constituent quark model is used to predict the electron energy spectrum in semileptonic D and B meson decays. Particular attention is paid to the endpoint region of the electron spectrum in B decays since this is crucial to a determination of the b --> u weak mixing angle

Dwarf Galaxies with Ionizing Radiation Feedback. I: Escape of Ionizing Photons

We describe a new method for simulating ionizing radiation and supernova feedback in the analogues of low-redshift galactic disks. In this method, which we call star-forming molecular cloud (SFMC) particles, we use a ray-tracing technique to solve the radiative transfer equation for ultraviolet photons emitted by thousands of distinct particles on the fly. Joined with high numerical resolution of 3.8 pc, the realistic description of stellar feedback helps to self-regulate star formation. This new feedback scheme also enables us to study the escape of ionizing photons from star-forming clumps and from a galaxy, and to examine the evolving environment of star-forming gas clumps. By simulating a galactic disk in a halo of 2.3e11 Msun, we find that the average escape fraction from all radiating sources on the spiral arms (excluding the central 2.5 kpc) fluctuates between 0.08% and 5.9% during a ~20 Myr period with a mean value of 1.1%. The flux of escaped photons from these sources is not strongly beamed, but manifests a large opening angle of more than 60 degree from the galactic pole. Further, we investigate the escape fraction per SFMC particle, f_esc(i), and how it evolves as the particle ages. We discover that the average escape fraction f_esc is dominated by a small number of SFMC particles with high f_esc(i). On average, the escape fraction from a SFMC particle rises from 0.27% at its birth to 2.1% at the end of a particle lifetime, 6 Myrs. This is because SFMC particles drift away from the dense gas clumps in which they were born, and because the gas around the star-forming clumps is dispersed by ionizing radiation and supernova feedback. The framework established in this study brings deeper insight into the physics of photon escape fraction from an individual star-forming clump, and from a galactic disk.Comment: 15 pages, 12 figures, Accepted for publication in the Astrophysical Journal, Image resolution reduced, High-resolution version of this article is available at http://www.jihoonkim.org/index/research.html#sfm

Dwarf Galaxies with Ionizing Radiation Feedback. II: Spatially-resolved Star Formation Relation

We investigate the spatially-resolved star formation relation using a galactic disk formed in a comprehensive high-resolution (3.8 pc) simulation. Our new implementation of stellar feedback includes ionizing radiation as well as supernova explosions, and we handle ionizing radiation by solving the radiative transfer equation rather than by a subgrid model. Photoheating by stellar radiation stabilizes gas against Jeans fragmentation, reducing the star formation rate. Because we have self-consistently calculated the location of ionized gas, we are able to make spatially-resolved mock observations of star formation tracers, such as H-alpha emission. We can also observe how stellar feedback manifests itself in the correlation between ionized and molecular gas. Applying our techniques to the disk in a galactic halo of 2.3e11 Msun, we find that the correlation between star formation rate density (estimated from mock H-alpha emission) and molecular hydrogen density shows large scatter, especially at high resolutions of <~ 75 pc that are comparable to the size of giant molecular clouds (GMCs). This is because an aperture of GMC size captures only particular stages of GMC evolution, and because H-alpha traces hot gas around star-forming regions and is displaced from the molecular hydrogen peaks themselves. By examining the evolving environment around star clusters, we speculate that the breakdown of the traditional star formation laws of the Kennicutt-Schmidt type at small scales is further aided by a combination of stars drifting from their birthplaces, and molecular clouds being dispersed via stellar feedback.Comment: 16 pages, 15 figures, Accepted for publication in the Astrophysical Journal, Image resolution greatly reduced, High-resolution version of this article is available at http://www.jihoonkim.org/index/research.html#sfm

Characterizing the transition dynamics for multi-pulsing in mode-locked lasers

We consider experimentally and theoretically a refined parameter space near the transition to multi-pulse modelocking. Near the transition, the onset of instability is initiated by a Hopf (periodic) bifurcation. As cavity energy is increased, the band of unstable, oscillatory modes generates a chaotic behavior between single- and multi-pulse operation. Both theory and experiment are in good qualitative agreement and they suggest that the phenomenon is of a universal nature in mode-locked lasers at the onset of multi-pulsing from N to N + 1 pulses per round trip. This is the first theoretical and experimental characterization of the transition behavior, made possible by a highly refined tuning of the gain pump level

The Inculcative Power of Australian Cadet Corps Uniforms in the 1900s and 1910s

The 1900s and 1910s were a prime era for the growth and empowerment of cadet corps within Australia. Private schools in particular sought to build on a newfound spirit of nationalism following the Federation of the colonies in 1901 by harnessing enthusiasm for the nation and British Empire, and by cultivating a martial culture among their predominantly middle-class students. The principal tool harnessed in that cultivation were the school cadet corps, and the most visible symbol of those corps were their uniforms. By focussing on the cadet corps in the private schools of Sydney during this era, this article will explore the emphasis placed on cadet corps uniforms and argue that uniforms were the central element used cultivate a sense of identity and esprit de corps. When considered within the context of broader cadet corps activities, this will further demonstrate the power of uniforms as an instrument of cultural inculcation

Shadows of the Great War: Group Soldier Settlement in Greater Sydney, 1917-1939

The Australian Soldier Settlement Scheme was part of state and Commonwealth governments' repatriation plans to assist returned men become farmers after the Great War. In New South Wales about 9,000 men including a small number of women became soldier settlers under this scheme. One of the tenures promoted by the New South Wales government was group settlement. In the County of Cumberland, the greater Sydney area, six group soldier settlements were established between 1917 and 1920. All were small acreage, largely planned as poultry farms, with some viticulture and market garden blocks. Group settlement was promoted as suitable for men with no capital, little farming experience or those with war-related injuries. Seen as a fitting reward for service to their country, a small soldier settlement farm was an opportunity for many men to become a landowner. This thesis provides a re-evaluation of the significance of group soldier settlement, linking it to earlier utopian ideals of communal living. It argues Labor politicians, notably Chris Watson and William Holman, promoted these ideals believing they would improve working men's lives. Planned to benefit both the state's economy and the ex-serviceman, this thesis argues group soldier settlement was a realistic way to settle large numbers of inexperienced men under supervision in a state that had little available Crown lands. It recognises government planners had little concept of the impact war-related injuries would have when ex-servicemen returned to civilian life, but argues plans for partially disabled men were inadequate post-war. However, this thesis argues group soldier settlement was a chimera. More than 350 tried on these settlements, but few lasted. Soldier settlers on these group settlements were destined to fail largely due to their war-related physical and psychological disabilities. Pre-war most had relied on their physical strength and fitness working as unskilled labourers for a living. The war robbed them of their health, and gave the men few options. Following discharge they needed to find permanent work to support themselves with dignity. Group soldier settlement therefore seemed a practical option, close to the on-going medical treatment many required. A war pension was never a living wage to support a man and his family. Governments were confident group settlement would work - it did not. Forced to leave because of their health, many of these soldier settlers never worked again. For returned men on the group soldier settlements in the County of Cumberland, the shadows of the Great War lasted a lifetime

High-Energy Passive Mode-Locking of Fiber Lasers

Mode-locking refers to the generation of ultrashort optical pulses in laser systems. A comprehensive study of achieving high-energy pulses in a ring cavity fiber laser that is passively mode-locked by a series of waveplates and a polarizer is presented in this paper. Specifically, it is shown that the multipulsing instability can be circumvented in favor of bifurcating to higher-energy single pulses by appropriately adjusting the group velocity dispersion in the fiber and the waveplate/polarizer settings in the saturable absorber. The findings may be used as practical guidelines for designing high-power lasers since the theoretical model relates directly to the experimental settings

Semileptonic B and D decays in the quark model

We predict the matrix elements and resulting electron spectra for semileptonic meson decays using the quark potential model. Particular attention is paid to the high-energy electron end-point region in B decay since it is crucial to a determination of the b→u weak mixing angle. It is argued that in this region the usual inclusive ("quark decay") calculations are unjustified and must be replaced by explicit sums over decays of the original meson into low-mass exclusive hadronic final states