Summary form only given. A research and development program is being conducted in view of realizing an electromagnetic and hadronic calorimeter for the Large Hadron Collider (LHC). The authors report ...on tests on fast electronics, coupled to an electromagnetic prototype calorimeter built with an accordion structure. Three different types of preamplifiers have been used. In two (Si and GaAs hybrids), the preamplifier is operated in liquid argon. In the third one, a common based (Si JFET or GaAs) transistor is in the liquid, the charge preamplifier being outside the cryostat, after about 6 m of 50- Omega cable. The shaping amplifier uses RC-CR filtering. The response to a short current pulse peaks after about 20 ns. When the system is connected to the calorimeter, the liquid argon signals peak, as expected, after 30 ns. Noise, linearity, and cross-talk between channels were investigated. First results from an exposure of the calorimeter to electrons of energy 30 to 175 GeV were obtained.< >
The meristematic cell flow or percentage of cells formed per unit of time is constant under standard experimental conditions. In this paper, the cell flow is measured directly under the action of the ...colchicine, by observing the cell increase at metaphase, and with the caffeine by observing the production and increase of binucleate cells in successive units of time. The analysis of different concentrations and periods of treatment has shown the 2hr treatment of 0.05% colchicine and the 4hr treatment of 0.1% caffeine as the more effective in order to measure the cellular increase. Both drugs have a depressive effect upon the division cycle as a whole, in a uniform and homogeneous fashion. Colchicine slows down the division cycle in a 50% and caffeine in a 60% of the normal cell flow. This depressing effect must be borne in mind in any estimate of the cycle time and mitotic rate by means of these drugs.
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Provider: - Institution: - Data provided by Europeana Collections- Appartient à l’ensemble documentaire : MethMusiq- Avec mode texte- All metadata published by Europeana are available free of ...restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Appartient à l’ensemble documentaire : MethMusiq- Avec mode texte- All metadata published by Europeana are available free of ...restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Appartient à l’ensemble documentaire : MethMusiq- Avec mode texte- All metadata published by Europeana are available free of ...restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Contient une table des matières- Avec mode texte- All metadata published by Europeana are available free of restriction under the ...Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Contient une table des matières- Avec mode texte- All metadata published by Europeana are available free of restriction under the ...Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
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