A KrF-laser excited by a capacitively coupled longitudinal discharge

The performance of a KrF excimer laser, excited by a discharge produced in a quartz tube between two metallic electrodes at its end and the inner tube wall serving as a dielectric electrode, is described. The dielectric electrode is capacitively coupled to a metallic electrode surrounding the quartz tube coaxially. Laser output energies up to 0.9 mJ in pulses having a duration of 6 ns FWHM could be obtained at a driving voltage of 100 kV

A study of the electron quenching of excimers in a KrF* laser excited by a coaxial electron beam

Measurements of the output energy, the optical pulse length and the build-up time of the laser pulse, obtained with a coaxially e-beam pumped KrF* laser, were performed varying the total gas fill pressure, the F2 content and the e-beam current from 1–5 bar, 0.1–0.8% and 13.3–26.6 kA, respectively. The maximum specific extraction energy amounts to 64 J/l. The large range of measurements, especially at low F2 concentrations, reveals the necessity to extend the kinetics of the F2 chain in the usual computer model. With the introduction of electron quenching of KrF* and ArF* by dissociative attachment the predictions are also for low F2 concentration in agreement with experiments

Is Selling Sex Good Business? : Prostitution in Nineteenth Century New York City

This study examines the impact of red light districts on the New York City’s land values for the years 1867 to 1870 using the monocentric model and bid-rent function as the foundation for the analysis. The results suggest that the Tenderloin red light district is a positive amenity, while the Bleecker and Washington Square red light district is a disamenity. The history of prostitution in New York City provides valuable insight into causes for the differences in the marginal impacts of prostitution on Manhattan’s urban environment. In the end, despite prostitution’s ongoing profitability well into the twentieth century, the strong disamenity associated with the Bleecker and Washington Square brothels and the oppressive conditions of the prostitution business merit strict attention. Metropolitan policy makers must be aware of a brothel’s work conditions and its impact on the surrounding urban environment when they implement laws and regulations against prostitution

Temporal extension of stable glow discharges in fluorine-based excimer laser gas mixtures by the addition of xenon

The effect of addition of xenon on the long term homogeneity of discharges in F2and ArF excimer laser gas mixtures was investigated in a small-volume discharge chamber. The gas mixture in the discharge chamber was preionized by X-rays. A special electrical excitation circuit containing a pulse forming line provided a long, square-shaped current pumping pulse of a predetermined duration to the discharge electrodes. The initiation and the development of the discharge was monitored via its fluorescence signal with an intensified CCD camera. We found that adding Xe up to partial pressures of 0.53 mbar extended the homogeneous phase of the discharge from 80 ns to approximately 200 ns in He/F2as well as in He/Ar/F2and Ne/Ar/F2excimer laser gas mixtures. Monitoring of the ArF and XeF spontaneous emission signals showed that the formation of ArF excimers remained unaffected by the addition of xenon (up to 1.3 mbar) to the laser gas mixture

The Politics of Foreign Direct Investment in Authoritarian Regimes

Existing scholarship does not account for why foreign direct investment (FDI) inflows have been increasing to many authoritarian countries in recent decades, with some authoritarian developing countries attracting levels of FDI similar to those in democratic developing countries. This dissertation argues that while authoritarian countries are in general more risky than democratic countries, this risk can be minimized when authoritarian regimes are constrained from both “above” and “below.” Authoritarian regimes that sign international investment treaties signal FDI-friendly policies and are constrained from backtracking on those policies. At the same time, authoritarian regimes that allow some degree of citizen participation in policymaking are constrained from deviating from FDI-friendly policies, which are generally preferred by citizens. In sum, it is hypothesized that authoritarian regimes that sign international investment treaties and maintain relatively high levels of citizen participation will attract the most FDI inflows. This hypothesis is tested using micro and macro level empirical evidence. Specifically, multilevel ordered probits of survey data on citizen preferences for FDI and statistical regressions of panel data on global FDI inflows are conducted. Estimation results confirm both the theoretical foundations and formal hypothesis of this dissertation: citizens in authoritarian countries view FDI inflows as welfare-enhancing and authoritarian countries with bilateral investment treaties and high levels of citizen participation attract the most FDI inflows. Additionally, results from an original survey of U.S. foreign investors reveal that multinational companies are aware of and value international investment treaties and freedom of association in host nations, thereby providing key primary evidence in support of the hypothesis. Finally, a comparative case study of Jordan and Syria further illustrate the micro-foundations of the argument. While both Jordan and Syria have signaled a dedication to liberal economic policies, Jordan has been the successor in attracting FDI inflows because of its participatory decision-making processes. This dissertation contributes to international political economy, international organization, and authoritarian political institution research by illuminating the domestic factors that provide credibility of compliance to international treaties signed by authoritarian countries. Previous literature has failed to address the variation of foreign investment inflows to authoritarian regimes and the role of compliance to international investment treaties in attracting these investment inflows to authoritarian countries

Helping young designers design for children: evaluating toys and possible values

When designing for children, it remains important not only to emphasise elements such as ergonomics and usability but also values, that can be translated into pleasurable user experiences for children. While methods such as interviews are commonly used to better understand our users, interviewing children can be a challenge. Experience as part of a year project on designing toys for children highlighted that children might answer questions in a surprising way, or students might struggle to ask questions that are not suggestive. To overcome some of these difficulties, we developed a Value Matrix, that can help students to explore the various values or incentives children might have while playing. This Value Matrix can subsequently be used to scan existing toys or new concepts and translate these insights into toys that consist of a wider variety of values children like to experience in a game or toy. We evaluated this tool with 118 first year Industrial Product Design students. Our results show that the Value Matrix gives students guidance and support while designing

Long-pulse KrCl laser with a high discharge quality \ud

The discharge quality and optimum pump parameters of a long-pulse high-pressure gas discharge excited KrCl laser are investigated. A three-electrode prepulse–mainpulse excitation circuit is employed as pump source. The discharge volume contains a gas mixture of HCl/Kr/Ne operated at a total pressure of up to 5 bar. For a plane–plane resonator, the divergence of both output laser beams is measured. A low beam divergence of less than 1 mrad is measured as a result of the very high discharge homogeneity. A maximum laser pulse duration of 150 ns (FWHM) is achieved for a pump duration of 270 ns (FWHM) and a power density of 340 kW cm-3. Pumping the discharge under optimum conditions employing a stable resonator results in a maximum specific energy of 0.45 J/l with a laser pulse duration of 117 ns and an efficiency of 0.63% based on the deposited energy