455 research outputs found

    Letter from C. H. Wildish to John Muir, 1862 Jun 2

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    [4] I have not got my certificate yet I am going after it next Saturday. Send Davids AddressMine is Sussex [Wankesha?] Co. Wis.00297[1] School Room June 2nd/62 Dear [Muhis?] I have got my dollar and what is better your letter too. All your apologies for not sending it before are useless for I knew that it would have been forth coming before if something was not the matter. But enough about the old dollar suffice it to say that it has given me no trouble and that should you be placed in like circumstances again I shall-if it is in my power-only be to happy to oblige you again. Now Johnny what-ever betook you to say that my laugh used to shake those old huge limestone walls. I think perhaps that your mind was deeply absorbed in some interesting chemical expriment. Perhaps you were trying to find out the inherent properties of [Deflogisticated Muritic Reid Sas?] [2] or Su[illegible] [illegible]. I was glad to hear that the wheels of the old University mill continue to go. Wonder if Muirs old clock still clicks and wheels turn round yet. Hope they do. Glad to hear that [Bread?] tickets were so cheap for when tickets and crackers are plentiful Muir says-begone dull care.- Do you go bathing of a morning how I should to go to do you all at the top of the stairs for W[illegible] I was very sorry that I was not able to be amongst you the present term for I had calculated on a good time but a fit of sickness in the Spring kept me so long from my good Mother that I felt somewhat weaned but Oh how I long for the good old pass again. I am teaching school in my own neighborhood. Say Muir what do you think. that girl of mine comes to my school. what do you think of that. Isnt it nice.[3] Say Muir I have something to ask of you wont you do it. I want you when the term is out to come and see me down in my home. It will not be much out of your road home for you can come to Waukesha on the cars I will fetch you with a team from there to our house and then carry you safely - that is after you have made a visit - to a station on the Sa Crosse Road. What do you say. Write and let me know Now do [come?] If you don\u27t - well no matter what Give my love to all my college friends G[illegible]old and S[illegible] in particular. I shall be up there next term if all is well. And now may heavens choisests blessings attend you and yours while travelling through the world of woes and may you with the rest of good men be gathered into the [illegible] of the Lord From your Dear Friend [C. H. Wildish?

    Distributed Computing Grid Experiences in CMS

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    The CMS experiment is currently developing a computing system capable of serving, processing and archiving the large number of events that will be generated when the CMS detector starts taking data. During 2004 CMS undertook a large scale data challenge to demonstrate the ability of the CMS computing system to cope with a sustained data-taking rate equivalent to 25% of startup rate. Its goals were: to run CMS event reconstruction at CERN for a sustained period at 25 Hz input rate; to distribute the data to several regional centers; and enable data access at those centers for analysis. Grid middleware was utilized to help complete all aspects of the challenge. To continue to provide scalable access from anywhere in the world to the data, CMS is developing a layer of software that uses Grid tools to gain access to data and resources, and that aims to provide physicists with a user friendly interface for submitting their analysis jobs. This paper describes the data challenge experience with Grid infrastructure and the current development of the CMS analysis system

    Performance of the CMS Cathode Strip Chambers with Cosmic Rays

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    The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device in the CMS endcaps. Their performance has been evaluated using data taken during a cosmic ray run in fall 2008. Measured noise levels are low, with the number of noisy channels well below 1%. Coordinate resolution was measured for all types of chambers, and fall in the range 47 microns to 243 microns. The efficiencies for local charged track triggers, for hit and for segments reconstruction were measured, and are above 99%. The timing resolution per layer is approximately 5 ns

    Performance and Operation of the CMS Electromagnetic Calorimeter

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    The operation and general performance of the CMS electromagnetic calorimeter using cosmic-ray muons are described. These muons were recorded after the closure of the CMS detector in late 2008. The calorimeter is made of lead tungstate crystals and the overall status of the 75848 channels corresponding to the barrel and endcap detectors is reported. The stability of crucial operational parameters, such as high voltage, temperature and electronic noise, is summarised and the performance of the light monitoring system is presented

    First measurement of the quark-to-photon fragmentation function

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    Production of excited beauty states in Z decays

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    A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994, is used to make an inclusive selection of B~hadron events. In this event sample 4227 \pm 140 \pm 252 B^* mesons in the decay B^* \to B \gamma and 1944 \pm 108 \pm 161 B^{**} mesons decaying into a B~meson and a charged pion are reconstructed. For the well established B^* meson the following quantities areobtained: \Delta M = M_{B^*} - M_{B} = (45.30\pm 0.35\pm 0.87)~\mathrm{MeV}/c^2 and N_{B^*}/(N_B+N_{B^*}) = (77.1 \pm 2.6 \pm 7.0)\%. The angular distribution of the photons in the B^* rest frame is used to measure the relative contribution of longitudinal B^* polarization states to be \sigma_L/(\sigma_L + \sigma_T)= (33 \pm 6 \pm 5)\%. \\ Resonance structure in the M(B\pi)-M(B) mass difference is observed at (424 \pm 4 \pm 10)~\mathrm{MeV}/c^2. Its shape and position is in agreement with the expectation for B^{**}_{u,d} states decaying into B_{u,d}^{(*)} \pi^\pm. The signal is therefore interpreted as arising from them. The relative production rate is determined to be \frac{BR(Z \to b \to B_{u,d}^{**})}{BR(Z \to b \to B_{u,d})} = [27.9 \pm 1.6(stat) \pm 5.9(syst) \phantom{a}^{+3.9}_{-5.6}(model)]\%. where the third error reflects the uncertainty due to different production and decay models for the broad B_{u,d}^{**} states

    Improved tau polarisation measurement

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    Inclusive production of neutral vector mesons in hadronic Z decays

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