Performance Report and Improvements in CV Machine Areas

The performance of cooling and ventilation (CV) equipment is defined as its availability to the PS, SPS and LEP accelerators. Three teams for the accelerators plus a Utilities team, which receives performance information from the physics and technical control room, carry out the operation of this equipment. Collected performance statistics as well as data from the Computer Aided Maintenance Management system (CAMM) and supervision system provide information on the exact state of the CV equipment. This is used to more effectively schedule preventive maintenance which, by reducing system failures, results in improved equipment performance. This paper will present performance data and discuss the prospects for improving it through the use of an updated version of CAMM and a new supervision system

Reactivity difference between protolytic forms of some macrocyclic chromium(III) complexes in ligand substitution and electron transfer processes

The review provides insight into the mechanism of ligand substitution and electron transfer (from chromium( III) to iron(III)) by comparison of the reactivity of some tetraazamacrocyclic chromium(III) complexes in the conjugate acid-base forms. Use of two geometrical isomers made possible to estimate the influence of geometry and protolytic reactions in trans and cis position towards the leaving group on the rate enhancement. Studies on the reaction rates in different media demonstrated the role played by outer sphere interactions in a monodentate ligand substitution

Construction progress of the cooling & ventilation in the LHC project

After the LEP dismantling Phase the Cooling and Ventilation Group has started the LHC construction work. Year 2001 through to 2004 will certainly be the most important period of activity for the CV group in the erection phase The author will report on the current works that are in progress on the different LHC Points distinguishing between the Ventilation and the Water Cooling installations. The Ventilation work completed in the new surface buildings in Points 1, 4,5,6 and 8. The work for the Cooling plants comprehend to the pumping stations, the cooling towers and the chilled water production stations in Points 1 and 5, For all of these activities, an updated report of the progress the work, the planning and of the expenses are given. Finally, a brief overview of the future activities is presented

Facile cobalt(III) template synthesis of novel branched hexadentate polyamine monocarboxylates

New hexadentate polyamine monocarboxylate ligands, 11-amino-9-(2- aminoethyl)-3,6,9-triazaundecanoate (tren-engly-), 12-amino-10-(2-aminoethyl)-3,7,10-triazadodecanoate (tren-tngly-) and 13-amino-11 (2-aminoethyl)-3,8,11-triazatridecanoate (tren-bngly-), were synthesized by intramolecular coupling of tetradentate tris(2-aminoethyl) amine (tren) and didentate N-(ω-formylalkyl)glycinates, OCH(CH 2)n,NHCH2CO2-, in easily and stereoselectively assembled cobalt(III) templates, p-[Co(tren){(RO) 2CH(CH2)nNHCH2CO2}] (O3SCF3)2, n= 1-3 (R = Me or Et). The reaction sequences comprised assembly of the template from [Co(tren)(O 3SCF3)2]O3SCF3 (1) and (RO)2CH(CH2)nNHCH2CO2Et, deprotection of the pendant acetal in acid, intramolecular condensation of the resulting aldehyde with a coordinated primary amine at intermediate pH to form the inline and reduction of this by NaBH4. For n = 1, imine formation occurred exclusively at the primary amine trans to the carboxylate producing the hexadentate 11-amino-9-(2-aminoethyl)-3,6,9-triazaundeca-5-enoato (tren-enimgly-) complex, i-[Co(trenenimgly)]Cl2̇3. 5H2O. In all instances, subsequent imine reduction gave the s isomer complex, exclusively. Complexes p-[Co(tren){(MeO)2CHCH 2gly}](O3SCF3)2 (3), i-[Co(tren-enimgly)]ZnCl4̇H2O (5), s-[Co(tren-engly)]ZnCl4 (s-6), s-[Co(tren-tngly)]ZnCl 4̇H2O (s-7) and s-[Co(tren-bngly)ZnCl 3]2ZnCl4 (s-8) were structurally characterized by X-ray crystallography. Charcoal-catalyzed equilibration of s-[Co(tren-engly)]Cl2̇2H2O dissolved in water produced the s- (s-6), p- (p-6) and t-[Co(tren-engly)]2+ (t-6) isomers in comparable amounts, p-6 and t-6 were also structurally characterized as their tetrachlorozincate and chloride salts, respectively. In base-catalyzed reactions, s-6 and t-6 each also formed p-6. Reduction of s-[Co(tren-engly)] Cl2̇2H2O with (NH4)2S and acidification liberated the pentaamino carboxylic acid ligand which was isolated as the hydrochloride salt

Entrepreneurial learning and the role of venture capitalists.

This paper develops a model of entrepreneurial learning in order to explain how VCs support the process of entrepreneurial learning and thereby add value to their ventures. We draw on two generic approaches to learning, termed the hypothesis-testing mode and the hermeneutic mode, which turn out to be closely interrelated in such learning processes. The resulting model comprises four categories, which focus on what entrepreneurs learn and how it is learnt: experimentation, evaluation, unreflective action and unverified assumptions. We then use these analytical categories to illustrate how VCs apply their different forms of expertise to increase a venture’s value once an investment has been made