An Experimental Study of the Propagation of Equivalence Ratio Oscillations on their Effect on Combustion Instabilities

Lean premixed combustors have become a promising method in gas turbine engines to operate more efficiently and within the regulatory standards for emissions. However, this lean premixed operation is susceptible to combustion instabilities within the combustor. These instabilities are a coupling between the heat release and pressure oscillations which is impacted by many factors, one of which is the fuel oscillations. This study analyzed the way in which fuel oscillations propagate through the mixing chamber and combustor utilizing optical diagnostics. A swirl combustor was designed and fabricated to be the test bed for these optical diagnostics to measure the equivalence ratio both before and in the flame. The first was the development and implementation of a helium-neon laser probe to measure equivalence ratio in the mixing chamber of the combustor. The second was a photomultiplier tube system that was utilized to measure chemiluminescence data that has shown to correlate well with equivalence ratio within the flame. These two optical diagnostics provided information about the fuel mixture before the flame and in the flame itself. The results showed that acoustic forcing increased the mixing both axially and radially. Furthermore, there was a drop in equivalence ratio oscillations across the swirler under acoustic forcing and under controlled oscillating conditions. Finally, the photomultiplier tube system proved accurate under lean steady state conditions but needs further verification under controlled oscillating conditions and acoustic forcing conditions

Complete Genome Sequences of Paenibacillus Larvae Phages BN12, Dragolir, Kiel007, Leyra, Likha, Pagassa, PBL1c, and Tadhana

We present here the complete genomes of eight phages that infect Paenibacillus larvae, the causative agent of American foulbrood in honeybees. Phage PBL1c was originally isolated in 1984 from a P. larvae lysogen, while the remaining phages were isolated in 2014 from bee debris, honeycomb, and lysogens from three states in the USA

Edward I: A Lesson In Taxation

Equality in taxation is a problem much discussed because of the importance that taxes play in the lives of individual citizens. However, it is a problem impossible to solve through methods of implementation. Rather, it is an issue of occasion and convenience, and therefore, mechanism. This thesis uses the specific historical ex- ample of the crown government of Edward I of England as a resource of understanding. The reign of Edward I was a period where questions involving the equality and right of taxation were posed, and the king answered them popularly, which contributed to a wildly successful reign. However, unlike more politicized attempts at using the past to verify drawn conclusions in the modern era, this thesis looks to allow history to address the problem itself. A plethora of historical authorities both primary and secondary to the study of Edward I and a wide variety of studies on the philosophy and development of the modern U.S. Tax system were used to draw conclusions from the past to benefit our current perspective. The results of this research yielded the following conclusions: that a traditional policy of taxation and popular acceptance to any change in that policy, temporary or permanent, are necessary for general acceptance of any tax burden. This would require a new perspective in regards to how we relate taxes to the individual. Likewise, the tax system of the United States would require alteration before either of these principles were put into effect creating an extraordinary rippling effect throughout the entire governmental process. However, if the conclusions drawn can ascend into popular acceptance, it would be a worthy effort to make

Long-range interactions in a quantum gas mediated by diffracted light

A BEC interacting with an optical field via a feedback mirror can be a realisation of the quantum Hamiltonian Mean Field (HMF) model, a paradigmatic model of long-range interactions in quantum systems. We demonstrate that the self-structuring instability displayed by an initially uniform BEC can evolve as predicted by the quantum HMF model, displaying quasiperiodic "chevron" dynamics for strong driving. For weakly driven self-structuring, the BEC and optical field behave as a two-state quantum system, regularly oscillating between a spatially uniform state and a spatially periodic state. It also predicts the width of stable optomechanical droplets and the dependence of droplet width on optical pump intensity. The results presented suggest that optical diffraction-mediated interactions between atoms in a BEC may be a route to experimental realisation of quantum HMF dynamics and a useful analogue for studying quantum systems involving long-range interactions

Junior Recital: Josh Inglis, saxophone

This recital is presented in partial fulfillment of requirements for the degree Bachelor of Music in Performance. Mr. Inglis studies saxophone with Sam Skelton.https://digitalcommons.kennesaw.edu/musicprograms/2065/thumbnail.jp

Influence of Post-AI Nutrition on Blood Urea Nitrogen, Progesterone, and Pregnancy

Research has shown that changes in nutrition can have an effect on reproductive performance. Our objective was to determine the effect of post-AI nutrition on BCS, blood urea nitrogen (BUN), progesterone, and pregnancy rates. Forage-developed Angus-cross bred heifers (n = 336) were synchronized with the Select Synch+ Controlled Internal Drug Releasing device (CIDR) protocol (d -7 100 μg GnRH and CIDR; d 0 25 mg PG and removal of CIDR). Estrus was detected for 72 h and heifers bred by AI 12 h after being detected in estrus; heifers not in detected in estrus were bred by AI and given an injection of GnRH at 72 h. Each breeding period was equally divided into three treatments: 1) heifers returned to feedlot (LOT), 2) heifers were moved to pasture (PASTURE), or 3) heifers were moved to pasture and supplemented with 5 lb/hd/d of dried distillers grains plus solubles (SUPP). Blood samples were collected on d -7, 0, 2, 14 and 42 (pregnancy determination; d 0 = AI). Body condition scores were determined on d -7 and 42. All heifers were in similar BCS (5.4 ± 0.05) on d -7, but on d 42 SUPP (5.9 ± 0.04) were in better condition than LOT (5.8 ± 0.04) which were in better condition than PASTURE (5.4 ± 0.04). All treatments had similar BUN concentrations on d -7 (129 ± 1), but on d 2, 14, and 42 SUPP had greater BUN concentrations compared to both LOT and PASTURE. There was no difference in BUN concentrations between pregnant and open heifers. Progesterone concentrations were similar among all heifers on d 0 and 2. On d 14, SUPP had greater progesterone concentrations compared to LOT, and on d 14 and 42 PASTURE had greater progesterone concentrations compared to LOT. Progesterone was similar for open and pregnant heifers on d 0 and 2, but greater in pregnant heifers on d 14 and 42. There was no difference among treatments in pregnancy rates (57, 56, and 59% for SUPP, LOT, and PASTURE; analyzed by chi-square). In summary, supplementing forage-developed heifers after insemination increased BCS and BUN concentrations but had no effect on pregnancy rates

Influence of 4-Week Exercise Program on Clinical and Biomechanical Measures of Foot Function

The significance of foot muscle function associated with flat feet is unclear. It is reported that flat feet have significantly decreased lateral forefoot pressure during ambulation with increased midfoot contact area and increased pressure under the big toe. There are passive mechanisms in the foot that support the arch during static standing, but cannot produce energy for dynamic activity. The two most plausible explanations for energy generation of the midfoot for dynamic activity are muscle contributions or recoil of stretched soft tissue (i.e. plantar fascia and other ligaments) or a combination. No studies to date evaluate the ability of foot muscle training to alter foot pressure patterns in participants with flat feet

Effects of antiplatelet therapy on stroke risk by brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases: subgroup analyses of the RESTART randomised, open-label trial

Background Findings from the RESTART trial suggest that starting antiplatelet therapy might reduce the risk of recurrent symptomatic intracerebral haemorrhage compared with avoiding antiplatelet therapy. Brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases (such as cerebral microbleeds) are associated with greater risks of recurrent intracerebral haemorrhage. We did subgroup analyses of the RESTART trial to explore whether these brain imaging features modify the effects of antiplatelet therapy