Dissertations / Theses on the topic 'F-111s'

International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California
The Aircraft Research and Development Unit (ARDU) of the Royal Australian Air Force (RAAF) is the only agency in Australia that performs the full spectrum of military flight testing and is the new custodian of the instrumented weapons range at Woomera. Receiving early attention will be the upgrade and integration of ARDU's telemetry systems with the meteorological and tracking data acquisition capabilities at Woomera to minimize overhead and data turnaround time. To achieve these goals, maximum modularity, extensibility, and product interoperability is being sought in the proposed architecture of all the systems that will need to cooperate on the forecast test programmes. These goals are also driven by the need to be responsive to a wide variety of tasks which presently include structural flight testing of fighter and training aircraft, weapons systems performance evaluation on a variety of combatant aircraft, and a host of other tasks associated with all fixed and rotary wing aircraft in the Army and Air Force inventory. Of all these tasks however, ARDU sees that responsiveness to future testing of F-111Cs fitted with unique Digital Flight Control Systems along with USAF standard F-111Gs may place the most significant demands on data handling —particularly in regard to providing an avionics bus diagnostic capability when performing Operational Flight Programme (OFP) changes to the mission computers. With the timely assistance and advice of Loral Test & Information Systems, who has long-term experience in supporting USAF F-111 test programmes, ARDU is confident of making wise design decisions that will provide the desired flexibility and, at the same time, minimize life-cycle costs by ensuring compliance with the appropriate telemetry and open systems standards. As well, via cooperative agreements with the USAF, the potential exists to acquire proven software products without needing to fund the development costs already absorbed by the USAF. This paper presents ARDU's perception of future needs, a view by LTIS of how best to meet those needs, and, based on ARDU data, a view of how LTIS' proposal will satisfy the requirement to provide maximum extensibility with minimum life-cycle costs.

O presente trabalho descreve a metodologia para a padronização dos radionuclídeos 111In e 18F e a determinação dos Coeficientes de Conversão Interna do 111In em Sistema de Coincidência por Software (SCS). O 111In decai com uma meia-vida de 2,8 dias por processo de captura eletrônica seguido por emissão de raios gama concorrendo com os elétrons da conversão interna. O 18F é um emissor de pósitrons de meia-vida curta (1,8 h), usado em Medicina Nuclear. As soluções radioativas usadas neste trabalho foram fornecidas pelo Centro de Radiofarmácia do IPEN e as massas determinadas pela técnica do picnômetro. As medidas foram feitas utilizando o Sistema de Coincidência 4πβ-γ constituído por um contador proporcional de geometria 4π a gás fluente e um semicondutor HPGe, acoplado a este sistema foi utilizado um sistema digital denominado de SCS com vantagem de obtenção da curva de extrapolação em uma única medida. A atividade do 111In foi determinada pela técnica de extrapolação linear da eficiência do contador proporcional usando absorvedores externos em ambos os lados das fontes. Os valores dos Coeficientes de Conversão Interna Total foram determinados selecionando duas janelas de raios gama (175 keV e 245 keV). A atividade do 18F foi determinada pela técnica de extrapolação linear da eficiência do contador proporcional utilizando a discriminação eletrônica. O código de simulação Monte Carlo ESQUEMA versão 9 foi usado para simular a extrapolação da curva da eficiência do 18F, considerando as características do esquema de desintegração e todos os detalhes geométricos do sistema de detecção.
This paper describes the methodology for standardization of radionuclides 111In and 18F and the determination of Total Internal Coefficients of 111In by means of a software coincidence system (SCS). The 111In decays with a half-life of 2.8 days by the electron capture process followed by gamma rays emission competing with internal conversion electrons. The 18F is a positron emitter with a short halflife (1.8 h), used in Nuclear Medicine. The radioactive solutions were provided by the Center for Radiopharmacy IPEN and the masses determined by pycnometer technique. The measurements were made using a Coincidence System 4πβ-γ consisting of a proportional counter in 4π geometry fluent gas and a HPGe semiconductor, coupled to the system was used a digital system called SCS with the advantage of obtaining the extrapolation curve in a single measurement. The activity of 111In was achieved by means of the linear extrapolation technique of the proportional counter efficiency using external absorbers on both sides of the sources. The values of the Total Internal Coefficients were determined selecting the two windows of gamma rays (175 keV and 245 keV). The activity of 18F was determined by means of the linear extrapolation, using electronic discrimination. The Monte Carlo simulation code ESQUEMA version 9 was used to simulate the efficiency curve extrapolation of the 18F, considering the characteristics of the system, the decay scheme of disintegration and all geometric details of the detection system.

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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

En los últimos cinco años la tecnología de los recubrimientos superficiales se ha incrementado. Al respecto se tienen avances en las propiedades superificiales de los amteriales influyendo en el campo de la competitividad, producción de calidades y surgimiento de técnicas de recubrimientos, dependiendo de la adaptabilidad, aplicación y costo. En la actualidad el campo de las matrices de embutición apunta al problema generado en el servicio, modificaciones de medidas, desgastes, impactos, deformaciones y proceso de fractura, causado por las altas tensiones cortantes en zonas de deslizamiento de la chapa con la matriz. No obstante se puede recuperar la matriz por desgaste prematuro en bordes y posibles fisuras. A nivel mundial, el problema ha sido estudiado, pero dada su complejidad en la búsqueda de lograr la calidad y la efeciencia en las condiciones de servicio de la matriz, se aplican sobre su superficie las siguientes tecnologías: procesos térmicos, tratamientos superficiales, desposiciones superficiales y técnicas en recuperación por desgaste y fisuras. En esta investigación se aplicó la proyección térmica por llama con uso de polvo como ténica en reparación, en virud de la importancia de alternativas de recuperación de matrices de embutición para complementar las tecnologías existentes, garantizánose la función destino de la matriz, antes de ser consumida durante las operaciones de trabajo en frío y caliente. La proyección térmica por llama es una alternativa de bajo costo, aventajada en aplicación de capas cerámicas para recuperación de zonas desgastadas en matrices. Un requerimiento principal es la adherencia del recubrimiento en el sustrato y no es fácil alcanzar valores apropiados dadas la naturaleza cerámica del recubrimiento y los cortos tiempos de aplicación. Para cuantificar la adherencia se ensayaron las probetas recubiertas con aleaciones cerámicas sometidas a esfuerzos de cizalladura, para lograr en la intercara el deslizamiento cortante del recubrim
Maita, PA. (2007). Investigación de las características de adherencia sobre matrices de embutición de acero f-1110, y análisis mediante ensayos de emisión acústica, de recubrimientos de níquel-óxidos y carburos cerámicos aplicados por proyección térmica, y de las carac [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/1924
Palancia

Research Doctorate - Doctor of Philosophy (PhD)
Introduction: The effects of workplace exposure to neurotoxins on the central nervous system are well documented, however the effects on senses is an emerging area. This thesis has examined the senses: hearing, balance, touch and colour vision in a group of aircraft maintainers from the Royal Australian Air Force who undertook deseal/reseal fuel tank maintenance on F-111 aircraft compared to two different control groups. This exposed group used formulations containing neurotoxins in the fuel tank deseal/reseal process. Methods: Study population: The study population consisted of three groups: F-111 deseal/reseal exposed personnel, technical-trade comparisons to assess different base, same job and non-technical comparisons to assess same base, different job. The study utilised a mailed postal questionnaire and a series of clinical assessments. As military personnel, this study population met minimum physical fitness requirements on enlistment. Clinical assessment: Hearing was assessed by measuring hearing thresholds of each ear at eight frequencies from 500 to 8000 Hz using pure-tone audiometry. The percentage loss of hearing was calculated. Balance was assessed by measuring functional reach. Touch was assessed by measuring vibration perception thresholds at distal extremities using biothesiometry. Colour vision was assessed using the Ishihara test plates and the Lanthony D-15 Desaturated colour disc arrangement test. Those who failed the Ishihara test were excluded from the analysis. From the Lanthony colour disc arrangement test results the type of colour deficient vision was diagnosed, and Bowman’s colour confusion index was calculated. Other risk factors: In the postal questionnaire and during the clinical examination a number of other risk factors were assessed: anxiety and depression were assessed using the composite International Diagnosis Interview, Kessler Psychological distress scale, height, weight, and visual acuity (using Snellen chart). From the postal questionnaire information on general health and well-being, alcohol intake, smoking history, existence of tinnitus, doctor diagnosed diabetes, medications regularly used and a civilian job history were obtained. Other risk factors included in all statistical modeling included age, posting category, rank and location of clinical assessment. Statistical methods: Regression models were used to examine whether there was an association between F-111 fuel tank maintenance and sensory impairments, adjusting for possible confounders. In addition multiple linear regressions were also used to determine whether any association exists between the functional reach and the auditory thresholds at the eight measured frequencies in both ears. Graphical comparison was made of the hearing thresholds at all eight frequencies with the published ISO-7029 medians. Results: The study population consisted of 614 exposed personnel, 513 technical-trade comparisons and 403 non-technical comparisons (numbers in each analysis differ slightly). The percentage loss of hearing ranged from nil to 96 (median 1.5, quartiles 0.3, 5.5). A logistic regression model showed no statistically significant difference in percentage loss of hearing among the three exposure groups (exposed verses non-technical controls OR 1.1: 95%CI 0.7, 2.0 and exposed verses technical OR 0.9: 95% CI 0.6, 1.3). However, at all eight frequencies measured, all populations had lower than expected hearing thresholds based on published ISO-7029 medians. The linear regression model showed that functional reach was slightly better for the comparison groups than the deseal/reseal group with only one group being statistically significant; however the difference was not clinically significant. The model did show that functional reach decreases significantly with age, anxiety and depression, whereas it improves with height. A significant association was found between vestibular function, measured by functional reach, and auditory thresholds at 500 and 1000 Hz, which were influenced by anxiety. Over 26% of all study participants had chronic persistent decreased vibration perception threshold in the great toe. Statistically significant higher vibration perception threshold of the great toe was observed in the comparison groups; this remained significant when vibration perception threshold was dichotomized into normal and abnormal categories; however the effect was small and about ¼ the magnitude of diabetes. Age, height and diabetes were all significant and stronger predictors in most models. Colour confusion index results ranged from 1 to 2.8 (median 1.2, quartiles 1.1, 1.4) in the 2600 eyes tested. Forty five percent of all study participants had blue-yellow colour deficient vision in at least one eye which is consistent with environmental exposures. Logistic regression demonstrated statistically significant differences in colour confusion index category in the exposed group versus technical group (OR 1.7: 95% CI 1.3-2.0) and a blue-yellow confusion in the exposed group versus technical group (OR 1.4: 95% CI 1.1-1.7). Discussion: This study has examined the effects of the deseal/reseal exposures and aircraft maintenance on four senses: hearing, balance, touch and colour vision. The hearing analysis showed that while the study participants had high levels of hearing loss in comparison to the published ISO7029 medians we did not observe any difference between the three exposure groups. The analysis for balance did show a difference with one of the exposure groups; however the difference was too small to be clinically significant. The analysis for touch did show that one quarter of all study participants had chronic persistent increased vibration perception threshold in the great toe and the analysis for colour vision indicated reduced colour discrimination among the exposed subjects compared to the Richmond controls. These findings are relatively weak in determining the effect of the deseal/reseal exposures on these senses. However, the comparison with normative data that were available (hearing and vibration perception) did show that the study population as a whole have higher hearing thresholds and higher vibration perception thresholds. In the absence of normative data for colour vision we observed almost one third of all participants had an abnormal colour confusion index or a blue-yellow deficit. These finding would suggest that whilst the deseal/reseal exposures to ototoxins and neurotoxins were high, a Royal Australian Air Force effect is also being observed. This statement can be made with some confidence as all military personnel are required to be physically fit and pass a stringent medical before enlistment. Study strengths and weaknesses: a strength is the number of study participants; 1538 participants were examined for the general health and medical assessment making the SHOAMP study one of the largest in the examination of sensory neuropathy. Another is that all outcomes reported were directly measured in the health examination; no self-reported data has been used. One caveat is the study was carried out retrospectively without exposure data for the substances used in the deseal/reseal programs. Conclusion: This thesis has compared a series of sensory outcomes in personnel involved in F-111 DSRS activities with two contemporaneous comparisons groups. It shows non-specific decrease in hearing due to Air Force wide exposures, likely noise, but it does show a specific decrease in colour vision probably due to deseal/reseal exposures.

碩士
國立高雄大學
生命科學系碩士班
103
Escherichia coli is a commonly used gene transformation and protein production host in modern bioengineering. However, its Gram-negative double layer membrane structure also causes target protein aggregation in its periplasm space, leading to a result of inactive inclusion body formation. The aim of this study is to utilize a bacterial strain Pseudomonas pseudoalcaligenes F-111 to study its lipase chaperone’s characteristics of assisting lipase secretion. By utilizing PCR, both the lipase and lipase chaperone genes from F-111 were cloned and ligated with vector pGEM-3zf(+). The computer bioinformatics prediction showed the lipase polypeptide contains a signal peptide, a necessary for secretion. Meanwhile, the structure of lipase chaperone was predicted by homology modeling. Protein analysis showed the E. coli strain transformed with complete lipase and lipase chaperone genes express lipase activities. However, if the lipase chaperone gene is knocked out, despite SDS-PAGE still shows lipase expression, it did not express its activity as the E. coli strain transformed with complete lipase and lipase chaperone genes. In conclusion, the lipase chaperone gene cloned in this study plays a crucial role in lipase activity. The study expects the discovery would lead to constructing an expression vector with the lipase chaperone gene attached for it assisting target protein secreting, to improve the convenience of protein purification in future.

碩士
國立中山大學
化學研究所
86
The insertion of methylene (CH2) into the metal-alkyl bonds has been studied on Ag(111) surface under ultrahigh vacuum (UHV) conditions. The methyl (CH3) groups formed on Ag(111) by thermal dissociation of the C-Ibond in adsorbed methyl iodide (CH3I) below 200 K were coupled to produceethane (C2H6) around 250 K in temperature-programmed reaction (TPR) experiments. Similar low temperature C-I bond scissions in adsorbed methylene iodide (CH2I2) forming CH2(ad) was implicated based on the evolution of ethylene (C2H4) at 260 K in TPR. By studying the interaction of CH3(ad) and CH2(ad) coadsorbed on Ag(111), propane (C3H8) and butane (C4H10) were detected. It suggests that methylene was inserted into the Ag-CH3 bond to produce an ethyl (CH2CH3) group on Ag(111). In the presenceof methyl and ethyl groups, the fo;;owing self and cross coupling reactionsresulted in those longer-chain hydrocarbon compounds. In order to demonstratethe methylene insertion mechanism again, we used CF3 to substitute CH3 as thetarget for the methylene insertion. Trifluoromethyl iodide (CF3I) was used asa molecular precursor to generate adsorbed trifluoromethyl (CF3) fragments on Ag(111) surface. TPR studies of the CF3(ad) + CD2(ad) showed that CD2 was also inserted into the Ag-CF3 bond, however, followed by a simple termination step ,B-fluoride elimination, to produced 1,1-difluoroethylene-d2(CF2=CD2) in the gas phase. Two sequential methylene insertions were also implicated as evidencedby the production of 1,1,1-trifluoropropyl iodide - 2,3-d4 (CF3CD2CD2I) as aresult of the rcombination of CF3CD2CD2 with iodine. To our knowledge, this is the firat example of explicitly demonstrate the methylene insertion onAg(111) surface under ultrahigh vacuum conditions.

碩士
國立成功大學
物理學系碩博士班
95
We present an analysis of the photolysis of an adsorbed molecule induced by monochromatic synchrotron radiation. The system studied was CF3Cl adsorbed on Si(111)-7×7 at 30 K, and the technique employed was photoelectron spectroscopy (PES). The F(1s) core-level photoelectron spectra, under various photon exposure, show that the photolysis effect induced by the incident monochromatic synchrotron radiation photon occurs on adsorbed gas-solid system. It is interesting to estimate the photolysis cross section of adsorbed CF3Cl irradiation by photons from the sequential F(1s) core-level photoelectron spectra. Auger-Induced desorption are the major process responsible for the photodissociation of absorbed CF3Cl molecules. At the incident photon energy of 730 eV, we have obtained the photolysis cross section of CF3Cl for the highest-dosed surface (~3.0×10-17 cm2), the medium-dosed surface (~2.2×10-17 cm2), and the lowest-dosed surface (~2.0×10-17 cm2). At the incident photon energy of 690 eV, we have obtained the photolysis cross section of CF3Cl for the highest-dosed surface (~1.4×10-17 cm2) and the medium-dosed surface (~1.5×10-17 cm2). For the highest-dosed surface the direct photodissociation and the adsorbed molecule-mediated dissociation mechanisms are responsible for the dissociation of adsorbed molecules by the incident photon energy of 730 eV. However for the medium- and the lowest-dosed surface only the direct photodissociation is responsible for the molecular dissociation. For the incident photon energy of 690 eV, only the direct photodissociation mechanism is responsible for the photolysis of adsorbed molecules of the medium- and the highest- dosed surface.

碩士
國立中山大學
化學系
87
Abstract The chemical inertness and high thermal stability of fluorocarbons have wide applications. It has been known that replacement of hydrogen by fluorine will greatly increase the chemical and thermal stabilities of molecules because of the greater bond energy of the carbon-fluorine bond. By utilizing trifluoromethyl iodide (CF3I) as a precursor for preparing adsorbed CF3 groups, we discovered a facile, selective, and efficient way of activating the very robust C-F bond. Temperature-programmed reaction/desorption (TPR/D) spectroscopy demonstrated that tetrafluoroethylene (F2C=CF2) evolved at 250 K, attributed to self-coupling of two difluorocarbene (CF2) moieties after exposing the surface with CF3I at 110 K. In experiments involving coadsorption of diiodomethane-d2 (CD2I2) and CF3I, the intermediacy of CF2 was further confirmed by the evolution of 1,1-difluoroethylene-d2 (D2C=CF2) from the surface at 163 K. Unlike the C-H bond in CH3(ad) which is thermally stable up to 400 K, the activation of the C-F bond in CF3(ad) occurs at or prior to 163 K via the α-fluoride elimination pathway. In terms of molecular orbitals theory or thermodynamics, C-F bonds are susceptible to break on Cu surface. Finally, we draw an important conclusion that fluorine can stabilize the transition state in the bond scission processes, and the activation barriers for the α-elimination reaction is decreased. The fluorine substitution effect on the β-carbon was also investigated by studying the thermal chemistry of CF3CH2(ad) and CH3CH2(ad) on Cu(111), respectively. We found that fluorine has a similar effect on the transition state for the β-elimination process. These effects on transition states caused by fluorine not only reveals the electronic nature of reactants, but also suggests a fact that metal surfaces serve as electron donor in the α-elimination reactions and as electron acceptor in the β-elimination reactions.

In this thesis, it was shown that thin films of hexagonal praseodymium sesquioxide on Si(111) can be transformed to B-oriented twin free films of cubic praseodymium dioxide with oxygen vacancies by post deposition annealing in 1 atm. oxygen at temperatures from 300°C up to 700°C for 30 minutes. Films annealed at 100°C and 200°C are still purely hexagonal praseodymium sesquioxide after the annealing process. In the transformed films, two stoichiometric phases coexist laterally. The lateral lattice constant of both species is almost identical to the one of the originally deposited hexagonal praseodymium sesquioxide. Therefore, we assume that the lateral lattice constant is pinned throughout the oxidation process.The species are hence strained and show different vertical lattice constants, depending on the amount of oxygen vacancies. In some samples, those vacancies were partly ordered vertically, leading to a unit cell twice as large as expected for stoichiometric praseodymium dioxide.During the annealing process, an amorphous interfacial layer between substrate and oxide was detected. While the existence of this layer was known before, it was possible for the first time to quantify the thickness of the praseodymium rich part of this interface for epitaxially grown films. It was shown that this layer starts to grow significantly only during post deposition annealing at 500°C or more.These and other results for thin films were connected to previously published data for bulk praseodymia. The multi column model mentioned above for laterally coexisting praseodymia species in thin films was backed up by powder data. As a matter of fact, it was shown that this coexistence of several praseodymia species can be expected to be the rule rather than the exception.Strong evidence was found that results interpreted previously as stoichiometric cubic praseodymium sesquioxide contain more oxygen than originally thought...