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P Piot

Publications and source records attributed to P Piot.

At least 19 recordsLinked to original sources

Generation of GW radiation pulses from a VUV free-electron laser operating in the femtosecond regime.

Experimental results are presented from vacuum-ultraviolet free-electron laser (FEL) operating in the self-amplified spontaneous emission (SASE) mode. The generation of ultrashort radiation pulses became possible due to specific tailoring of the bunch charge distribution. A complete characterization of the linear and nonlinear modes of the SASE FEL operation was performed. At saturation the FEL produces ultrashort pulses (30-100 fs FWHM) with a peak radiation power in the GW level and with full transverse coherence. The wavelength was tuned in the range of 95-105 nm.

Journal Article↗

The global impact of HIV/AIDS.

The scale of the human immunodeficiency virus (HIV)/AIDS epidemic has exceeded all expectations since its identification 20 years ago. Globally, an estimated 36 million people are currently living with HIV, and some 20 million people have already died, with the worst of the epidemic centred on sub-Saharan Africa. But just as the spread of HIV has been greater than predicted, so too has been its impact on social capital, population structure and economic growth. Responding to AIDS on a scale commensurate with the epidemic is a global imperative, and the tools for an effective response are known. Nothing less than a sustained social mobilization is necessary to combat one of the most serious crises facing human development.

Acquired Immunodeficiency Syndrome↗

Introduction.

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Acquired Immunodeficiency Syndrome↗

Wealthy nations called on to boost support efforts. Five-year plan estimated to cost $9.2 billion.

Using the 20-year mark in the history of AIDS as a catalyst, the United Nations and other international organizations have called upon the world's wealthier nations to increase attention, support, and funding to HIV/AIDS prevention and treatment efforts. This call to action included a series of meetings with business and political leaders and culminated in the first United Nations General Assembly Special Session on HIV/AIDS, held in June.

Anti-HIV Agents↗

International response to the HIV/AIDS epidemic: planning for success.

More assertive political leadership in the global response to AIDS in both poor and rich countries culminated in June 2001 at the UN General Assembly Special Session on AIDS. Delegates made important commitments there, and endorsed a global strategy framework for shifting the dynamics of the epidemic by simultaneously reducing risk, vulnerability and impact. This points the way to achievable progress in the fight against HIV/AIDS. Evidence of success in tackling the spread of AIDS comes from diverse programme areas, including work with sex workers and clients, injecting drug users, and young people. It also comes from diverse countries, including India, the Russian Federation, Senegal, Thailand, the United Republic of Tanzania, and Zambia. Their common feature is the combination of focused approaches with attention to the societywide context within which risk occurs. Similarly, building synergies between prevention and care has underpinned success in Brazil and holds great potential for sub-Saharan Africa, where 90% reductions have been achieved in the prices at which antiretroviral drugs are available. Success also involves overcoming stigma, which undermines community action and blocks access to services. Work against stigma and discrimination has been effectively carried out in both health sector and occupational settings. Accompanying attention to the conditions for success against HIV/AIDS is global consensus on the need for additional resources. The detailed estimate of required AIDS spending in low- and middle-income countries is US$ 9.2 billion annually, compared to the $ 2 billion currently spent. Additional spending should be mobilized by the new global fund to fight AIDS, tuberculosis and malaria, but needs to be joined by additional government and private efforts within countries, including from debt relief. Commitment and capacity to scale up HIV prevention and care have never been stronger. The moment must be seized to prevent a global catastrophe.

Anti-HIV Agents↗

Global AIDS epidemic: time to turn the tide.

HIV/AIDS is catastrophic both from a public health perspective and in terms of its impact on economic and social stability in many of the most severely affected nations, including virtually all of southern Africa. A public health response alone is insufficient to address this devastating epidemic. Political leadership at the highest levels is needed to mobilize a multisectoral response to the impact of HIV/AIDS on educational systems, industry, agriculture, the military, and other sectors. With a few notable exceptions, political response was slow to mobilize in the early years of the epidemic, but response has dramatically improved in the past 18 months. The Joint United Nations Programme on HIV/AIDS (UNAIDS) is involved in ongoing efforts to encourage political leaders to make a multisectoral response to the epidemic a major focus of their national plans.

Acquired Immunodeficiency Syndrome↗

Sustained kilowatt lasing in a free-electron laser with same-cell energy recovery

Jefferson Laboratory's kW-level infrared free-electron laser utilizes a superconducting accelerator that recovers about 75% of the electron-beam power. In achieving first lasing, the accelerator operated "straight ahead" to deliver 38-MeV, 1.1-mA cw current for lasing near 5 &mgr;m. The waste beam was sent directly to a dump while producing stable operation at up to 311 W. Utilizing the recirculation loop to send the electron beam back to the linac for energy recovery, the machine has now recovered cw average currents up to 5 mA, and has lased cw with up to 1720 W output at 3.1 &mgr;m.

Journal Article↗