New Type of sub-THz Oscillator and Amplifier Systems Based on Helical-Type Gyro-TWTs

This work presents the development and systematic investigation of a new sub-THz source for the generation of trains of coherent high-power ultra-short pulses at 263 GHz via passive mode-locking of two coupled helical gyrotron traveling wave tubes (helical gyro-TWT). The frequency of 263 GHz is an established figure for continuous wave (CW) DNP-NMR application and, therefore, the investigated source will allow the development of novel spectroscopy methods such as time-domain DNP-NMR for which powerful sub-THz pulses with highest coherency are required. For the first time, it is shown that the operation of the passive mode-locked helical gyro-TWTs in the hard excitation regime is of particular importance to reach the optimal coherency of the generated pulses. To enable the operation in the hard excitation regime, a new extended passive mode-locked oscillator is proposed. The extended passive mode-locked oscillator will furthermore enable the generation of specific pulse sequences in addition to the generation of pulses with constant repetition frequency. This could be of particular interest for some time-domain DNP-NMR methods where well-defined pulse sequences are required

New Type of sub-THz Oscillator and Amplifier Systems Based on Helical-Type Gyro-TWTs

This work presents the development of a new sub-THz source for the generation of trains of coherent high-power ultra-short pulses at 263 GHz via passive mode-locking of two coupled helical gyro-TWTs. For the first time, it is shown that the operation of such passive mode-locked helical gyro-TWTs in the hard excitation regime is of particular importance to reach the optimal coherency of the generated pulses. This could be of particular interest for some new time-domain DNP-NMR methods

The Impact of the Global Financial Crisis on Public Expenditures on Education and Health in the Economies of the Former Soviet Union

This paper provides an overview of public expenditures on education and healthcare in Belarus, Georgia, Kyrgyzstan, Moldova, Russia, Ukraine and some other countries of the former Soviet Union before and during the global financial crisis. Before the crisis, the governments of these countries were substantially increasing spending on education and health. The crisis adversely affected the FSU countries and worsened their fiscal situation. The analysis indicates that during the crisis, despite the fiscal constraints, public education and health expenditures have mostly been maintained or increased in almost all of these countries. However, the crisis situation was not taken as an opportunity to address these countries’ key education and healthcare problems related to demographic changes, insufficient per capita expenditure levels, the low efficiency of public spending and the insufficient quality of services. These issues form an ambitious reform agenda for these countries in the medium- and long-term.Fiscal policy, Former Soviet Union, Education financing, Health financing, Global economic crisis

New Type of sub-THz Oscillator and Amplifier Systems Based on Helical-Type Gyro-TWTs

This work presents the development of a new sub-THz source for the generation of trains of coherent high-power ultra-short pulses at 263 GHz via passive mode-locking of two coupled helical gyro-TWTs. For the first time, it is shown that the operation of such passive mode-locked helical gyro-TWTs in the hard excitation regime is of particular importance to reach the optimal coherency of the generated pulses. This could be of particular interest for some new time-domain DNP-NMR methods

Multiple copy distillation and purification of phase diffused squeezed states

We provide a detailed theoretical analysis of multiple copy purification and distillation protocols for phase diffused squeezed states of light. The standard iterative distillation protocol is generalized to a collective purification of an arbitrary number of N copies. We also derive a semi-analytical expression for the asymptotic limit of the iterative distillation and purification protocol and discuss its properties.Comment: 11 pages, 13 figure

Challenges and Trajectories of Fiscal Policy and PFM Reform in CEE/CIS

The purpose of this study is to provide an overview of fiscal policies and PFM reforms in 7 countries in the Western Balkans and 12 countries in the CIS, including major macroeconomic and poverty trends, fiscal policy, the size and role of the public sector, public expenditure management and its linkage to policy development, the organization of budget processes on the central and local levels, the role of various actors and tools in PFM, including civil society and the international donor community. The period of 2003-2007 was characterized by an extraordinary high rate of economic growth, both worldwide and in the CEE/CIS region. This created macroeconomic room for meeting numerous development challenges: reducing poverty and inequality, improving the quality and coverage of public services, upgrading infrastructure, and advancing various reforms, including those related to PFM. However, the economic situation deteriorated dramatically in 2008 as a result of the global financial crisis, with deep recession hitting most of the countries in 2009 and bleak perspectives for subsequent years. It remains to be seen whether the crisis situation will force governments to speed up necessary reforms. In the PFM area major tasks concern lengthening fiscal planning horizon and gradual movement toward performance oriented budgeting the measure which can allow better expenditure targeting and decrease volatility in expenditure allocation), increasing budget transparency and creating real room for civil society involvement into a budget process. However, the reforms must also involve a broadly defined governance sphere, i.e. improving transparency and accountability of government, modernization of civil service, decentralization, including building a genuine system of local and regional self-government, and other similar measures to improve quality of public services and social policy interventions.public finance management, fiscal policy, Central and Eastern Europe, Western Balkans, Commonwealth of Independent States, social policies, social services, children and families