Inductance effects in the high-power transmitter crowbar system

The effective protection of a klystron in a high-power transmitter requires the diversion of all stored energy in the protected circuit through an alternate low-impedance path, the crowbar, such that less than 1 joule of energy is dumped into the klystron during an internal arc. A scheme of adding a bypass inductor in the crowbar-protected circuit of the high-power transmitter was tested using computer simulations and actual measurements under a test load. Although this scheme has several benefits, including less power dissipation in the resistor, the tests show that the presence of inductance in the portion of the circuit to be protected severely hampers effective crowbar operation

Reduction of ground noise in the transmitter crowbar instrumentation system by the use of baluns and other noise rejection methods

Electrical noise interference in the transmitter crowbar monitoring instrumentation system creates false sensing of crowbar faults during a crowbar firing. One predominant source of noise interference is the conduction of currents in the instrumentation cable shields. Since these circulating ground noise currents produce noise that is similar to the crowbar fault sensing signals, such noise interference reduces the ability to determine true crowbar faults

Long-term amplitude and phase stability of the 400-kW 2.115-GHz transmitter

Results of recent measurements of the long-term phase, amplitude and group delay stability of the 400-kW S-band (2.115-GHz) transmitter are reported. Various control parameters which are responsible for many of the observed instabilities are identified. Further tests to identify the parameters responsible for the remaining instabilities are suggested

Phase noise measurements of the 400-kW, 2.115-GHz (S-band) transmitter

The measurement theory is described and a test method to perform phase noise verification using off-the-shelf components and instruments is presented. The measurement technique described consists of a double-balanced mixer used as phase detector, followed by a low noise amplifier. An FFT spectrum analyzer is then used to view the modulation components. A simple calibration procedure is outlined that ensures accurate measurements. A block diagram of the configuration is presented as well as actual phase noise data from the 400 kW, 2.115 GHz (S-band) klystron transmitter

Equity research - Hilton Worldwide Holdings INC.

Mestrado Bolonha em FinançasThis Equity Research Report contains a valuation of Hilton Worldwide Holdings Inc. (“HLT”) and follows the format recommended by the CFA Institute. The hospitality industry was elected to perform my Master Final Work due to my passion for travel and Hilton was the selected company for being one of the leading and largest in the hotel business. Hilton’s portfolio comprises 6,837 properties, 1,074,791 rooms and 18 brands in 122 countries and territories. This research is issued considering only publicly available information on September 28 th, 2022. Therefore, any event or information available after this date has not been reflected. Our investment recommendation for 2023YE stands for HOLD, with a PT of $132.25 computed though the WACC method, corresponding to an upside potential of 6.94annualized return of 5.46$123.67 on September 28 th, 2022. In addition, to strengthen our recommendation other models were used, namely the Adjusted Present Value (APV), Flow-to-Equity (FTE) as well as a relative valuation. To conclude and complete our report, a sensitivity analysis and a Monte Carlo Simulation were performed to the price target for changes in WACC, terminal growth rate, Risk-free and RevPAR. Our risk assessment estimates a medium risk for the company.O projeto que se segue contém uma avaliação da Hilton Worldwide Holdings Inc. (“HLT”) e foi elaborado em conformidade com as recomendações do CFA Institute. Sendo viajar uma das minhas paixões, a indústria hoteleira foi a selecionada para a realização do meu projeto final de mestrado e a Hilton foi a empresa escolhida por ser considerada uma das líderes da indústria. O portfolio da Hilton inclui 6,837 propriedades, 1,074,791 quartos e 18 marcas em 122 países e territórios. Apenas informação pública disponível a 28 de setembro de 2022 foi considerada, qualquer evento ou informação após esta data não foi refletida. A recomendação de investimento para Hilton é de MANTER, com um preço-alvo de $132.25 no final de 2023 calculado através do modelo WACC, representando uma potencial valorização de 6.94$123.67. Adicionalmente, outros métodos foram utilizados, nomeadamente o Adjusted Present Value (APV), Flow-to-Equity (FTE) e ainda o modelo dos múltiplos comparáveis. De modo a concluir e complementar a nossa recomendação, realizamos uma análise de sensibilidade e uma Monte Carlo Simulation ao preço alvo para as variações no WACC, taxa de crescimento, Risk-free e RevPAR. A nossa avaliação de risco estima um risco médio para a empresa.info:eu-repo/semantics/publishedVersio

Trans Necrointimacies: Affect, Race, and the Chalky Geopolitics of Trans Memorialization

This dissertation explores the centrality of racialized trans death in structuring whiteness as emblematic of contemporary trans(normative) life. Taking my point of departure from the chalk outlines of dead bodies that frequently appear during rituals of trans memorialization, I analyze how the circulation of necropolitical affects coheres a form of trans-homonationalism within the Trans Day of Remembrance (TDOR). Held annually, TDOR events are global vigils that publicly mourn the victims of anti-trans violence. By analyzing narratives about trans-identified people of colour who have been memorialized by TDOR, I place the affective circulations of racialized, necropolitical violencea phenomenon I have termed trans necrointimaciesin conversation with TDOR to illustrate how racial decay is central to the securitization of both whiteness and trans homonationalism within the nation-state. Through participant observation at TDOR vigils in Toronto and New York, interviews with trans people of colour, and content-analysis of the TDOR website, this research highlights complex ways in which practices of trans memorialization circulate trans necrointimacies in the service of transnormative narratives of affective belonging within the nation-state. Tracing the affective worldings that occur through the spectacularization and consumption of ordinary racialized trans death, this dissertation seeks to animate the seemingly disparate narratives of counter-terrorism and trans politics, the trans body and the terrorist body, and vigilant reactions and the vigil that re-acts ordinary violences

Applying a dual-process framework to neural systems of social and emotional judgment

textPsychological models of judgment and decision-making that focus on dual processes distinguish between two modes of judgment. One mode of judgment uses incomplete, probabilistic associations that lead to good-enough judgments for most situations. A second mode of judgment uses more complete information and applies deterministic decision rules to reason through a decision. The two modes operate in parallel but they can also interact and may be viewed as ends of a continuum. Although some psychology researchers have hypothesized that the two modes of information processing are carried out by distinct neural systems, neural research has not fully tested the distinctions that psychological research has drawn between the two modes. Three studies aim to address the gap between psychological and neural models of judgment and decision-making. Study 1 addresses the lack of neural research comparing judgments based on probabilistic information (characteristic of the first mode of judgment in dual-process models) with judgments based on deterministic rules (characteristic of the second mode of judgment in dual-process models). Specifically, Study 1 compares basic probabilistic judgments and deterministic rule-based judgments to identify neural regions that are preferentially associated with one mode of judgment. Study 2 moves toward a more ecologically valid investigation of neural systems associated with judgments based on probabilistic associations. That is, Study 2 examines a probabilistic cue that is used in real-world judgments: affect. Study 3 examines neural regions associated with the interaction of the two modes of judgment in the underexplored domain of social evaluation. Modes of judgment may interact when the second mode of judgment uses new information to adjust a judgment previously driven by the first mode of judgment, as when a hiring manager uses information about a job candidate to adjust a first impression initially based on appearance. Study 3 examines the neural systems involved when people use newly available information to adjust a previously made affectively-driven judgment. Findings in the three studies contribute to scientific understanding of how neural regions support judgment, but do not definitively identify separable neural systems for dual-process modes of judgment.Psycholog

Conceptual design of a 1-MW CW X-band transmitter for planetary radar

A proposed conceptual design to increase the output power of an existing X-band radar transmitter used for planetary radar exploration from 365 kW to 1 MW CW is presented. The basic transmitter system requirements as dictated by the specifications for the radar are covered. The characteristics and expected performance of the high-power klystrons are considered, and the transmitter power amplifier system is described. Also included is the design of all of the associated high-power microwave components, the feed system, and the phase-stable exciter. The expected performance of the beam supply, heat exchanger, and monitor and control devices is also presented. Finally, an assessment of the state-of-the-art technology needed to meet system requirements is given and possible areas of difficulty are summarized

Polypharmacy in elderly: a cautious trail to tread

Polypharmacy has now increasingly come into focus as the recipient of healthcare in old age worldwide. In elderly it is associated with frequent adverse drug reactions (ADRs) and drug-drug interactions resulting in significant morbidity. Geriatrics is still an emerging specialty in South Asia, especially in Pakistan, where multiple reasons for polypharmacy exist. An extensive literature review of articles using key words like \\u27polypharmacy,\\u27 \\u27elderly\\u27 was conducted. The recently updated Beers Criteria of classification of inappropriate drugs in the elderly was reviewed in detail. Articles of relevance to polypharmacy and evaluation of guidelines for appropriate interventions to minimise inappropriate drug prescribing were also reviewed. Commonly prescribed drugs like psychotropic, cardiovascular, non-steroidal anti-inflamanatory drugs (NSAIDs) and oral hypoglycaemics can cause significant adverse events when prescribed to the elderly.Primary care physicians may use evidence based non-pharmacological interventions which may be appropriate to use in selected cases. Drugs can affect quality of life and morbidity in the elderly. A basic understanding of ageing physiology and pharmacology along with a step-wise approach to prescribing in the elderly maybe helpful in minimising iatrogenic complications of commonly used drugs in this age group

Integration of geriatrics into a spiral undergraduate medical curriculum in Pakistan: evaluation and feedback of third-year medical students.

Background: In the last decades there has been a sharp rise in the elderly population throughout the world. The unique needs of the elderly require a multidisciplinary and comprehensive medical approach. None of the 50 medical schools in Pakistan teach geriatrics in their undergraduate or postgraduate training. This paper discusses the development and implementation of the first geriatric curriculum in a medical school of Pakistan and its effect on knowledge and attitudes of third-year medical students. Methods: The curriculum was designed through collaboration and approval of various academic departments at the Aga Khan University in Karachi Pakistan. After a review of existing geriatric curricula at other institutions, a problem-based, inter-disciplinary spiral curriculum was designed. Strategy of student and course evaluation was planned and incorporated in the curricular program. No extra resources or funds were used. A component of the new curriculum was assessed by evaluating pre- and post- course knowledge, and seeking feedback from participating third-year students. Results: A significant improvement in mean scores for summed overall knowledge in geriatrics (pre-test mean 4.7 vs. post-test mean 6.4, p value of of \u3c0.001; out of a maximum possible of 9 was noted. Breakdown of knowledge mean scores into component areas of knowledge showed a significant increase in understanding in aging demographics (pretest 0.7 vs. post-test 1.7, p value of \u3c0.001), geriatric history taking (pretest 0.64 vs. post-test 0.88, p 0.001) and geriatric assessments (pre- test 1.4 vs. post- test 1.7,p value 0.01). A strong majority (87%) of the students felt that the overall course objectives were achieved. All students were satisfied with the quality of teaching, 90% rating it good or higher. Conclusion: An important advance in medical education was achieved via integration of a low cost, spiral geriatrics curriculum in a medical university of Pakistan. We found that introduction of the geriatric curriculum improved the knowledge of third-year medical students. This was our school\u27s initial step towards building professional capacity in response to a rising elderly population