877 research outputs found
Thesis Proposal: Design and Evaluation of the Hamal Parallel Computer
No full textWe wish to investigate design principles for general-purpose shared memory computers. Specific areas of interest are silicon efficiency, scalability, and RAM integration. Experiments will be performed using a cycle accurate simulator for the Hamal parallel computer. In this proposal we present an overview of the Hamal architecture and our plans for evaluating various mechanisms.
Design and evaluation of the Hamal parallel computer
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2003."December 2002."Includes bibliographical references (p. 145-152).This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Parallel shared-memory machines with hundreds or thousands of processor-memory nodes have been built; in the future we will see machines with millions or even billions of nodes. Associated with such large systems is a new set of design challenges. Many problems must be addressed by an architecture in order for it to be successful; of these, we focus on three in particular. First, a scalable memory system is required. Second, the network messaging protocol must be fault-tolerant. Third, the overheads of thread creation, thread management and synchronization must be extremely low. This thesis presents the complete system design for Hamal, a shared-memory architecture which addresses these concerns and is directly scalable to one million nodes. Virtual memory and distributed objects are implemented in a manner that requires neither inter-node synchronization nor the storage of globally coherent translations at each node. We develop a lightweight fault-tolerant messaging protocol that guarantees message delivery and idempotence across a discarding network. A number of hardware mechanisms provide efficient support for massive multithreading and fine-grained synchronization.(cont.) Experiments are conducted in simulation, using a trace-driven network simulator to investigate the messaging protocol and a cycle-accurate simulator to evaluate the Hamal architecture. We determine implementation parameters for the messaging protocol which optimize performance. A discarding network is easier to design and can be clocked at a higher rate, and we find that with this protocol its performance can approach that of a non-discarding network. Our simulations of Hamal demonstrate the effectiveness of its thread management and synchronization primitives. In particular, we find register-based synchronization to be an extremely efficient mechanism which can be used to implement a software barrier with a latency of only 523 cycles on a 512 node machine.by J.B. Grossman.Ph.D
A propos de Glozel
No full textBosch-Gimpera P., Favret P.-M, Forrer Robert, Hamal-Nandrin Joseph, Peyrony D., Pittard Eugène, Garrod Dorothy. A propos de Glozel. In: Bulletin de la Société préhistorique de France, tome 24, n°12, 1927. pp. 437-456
Arrêt du conseil d'état qui déboute Francois Ponche, notaire à Bretteville, élection de Falaise, de son opposition à l'arrêt du conseil du 2 octobre 1781 et à l'état qui y est annexé du 1er mai de la même année, par lesqueles les hameaux de la haute et basse Criquetière, dépendant dudit bourg de Bretteville, ont été assujettis aux droits d'entrée
No full text[Acte. 1747-08-19. Camp de Hamal
Generation of powerful picosecond pulses using a mode-locked SFUR Nd:YAG or Nd:YAP laser
No full textPhysics prospects with the ALFA and AFP detectors
No full textThe ATLAS ALFA and AFP detectors - the experimental challenge of measuring forward protons at the LHC. We will describe the experimental challenge presented by the measurement of the forward protons at the LHC. The ATLAS ALFA and AFP projects involve the deployment of detectors capable of detecting protons that emerge intact from the interaction with very small scattering angles. In the case of the ALFA detector, located at ±240m from the ATLAS interaction point, this measurement has to be performed using special high \beta* beam optics. The detector chosen for the task is a nearly edgeless scintillating fibre tracker capable of making measurements at very low t – below 10-3 GeV2 – in the Nuclear Coulomb interference region. In order to reach these very small t-values we need to deploy the detector very near to the beam line utilizing Roman Pots. The main purpose of the ALFA detector is to measure the total p-p cross-section, a fundamental quantity in hadronic physics of importance to particle and to cosmic ray physicists and to provide absolute measurement of luminosity which includes eventual measurements of dependency of nuclear slope b and ρ parameters on t. Another capability of ALFA detector is measurement of soft diffraction and some exclusive processes. The main purpose of the AFP detector is to measure exclusive physics processes and anomalous couplings. The AFP detectors are placed at ±206 and ±214 meters on both side of the ATLAS experiment giving ATLAS the remarkable capability to tag and measure, with 3-D silicon detectors, both protons in exclusive central diffractive processes. The use of precision timing detectors allows this type of physics to be pursued to high luminosity for the first time. The AFP project opens up an important new window on LHC physics not available with the standard ATLAS detector. In this talk the experimental challenges in constructing this detector as well as the status of the project will be discussed
Le varietà di avena per le semine 2013-14.
No full textNell'areale Nord le produzioni più elevate sono state conseguite dalle varietà più tardive Aveny, Gniady e Teo BD40,insieme alle più precoci Genziana, Bionda e Alcudia. Nelle aree del Centro-sud oltre ad Aveny, Genziana e Gniady, si sono distinte anche Primula e Hamal. Nelle isole si sono differenziate Primula, Alcudia, Genziana, Stella D'oro e Hamel
Positive solutions for fractional boundary value problem including mixed derivative with P-laplacian operator
No full textBu tez çalışması giriş bölümü dışında üç bölümden oluşmaktadır. İkinci bölümde, tez çalışmasında kullanılacak olan temel tanımlara ve teoremlere yer verilmiştir. Üçüncü bölümde, p-Laplacian operatörlü karışık türev içeren kesirli sınır değer probleminin çözümü incelenmiş ve Avery-Peterson sabit nokta teoremi kullanılarak en az üç pozitif çözümün var olduğu ispatlanmıştır. Son bölümde ise bu çalışmalar doğrultusunda elde edilen bilgilerin sonucuna yer verilmiştir.Without the introduction, the thesis comprises of three chapters. In the second chapter, basic notions which will be used in the thesis are given. In the third chapter, solutions of p-Laplacian mixed derivative fractional boundary value problem are demonstrated and by using Avery-Peterson fixed point theorem, existence of problem at least three positive solutions are proved. In the last chapter, the results obtained from these studies are given
- …
