The introduction of blade servers for diverse applications is expanding rapidly. The switch blade—a key network component of the blade server—must provide high performance to accommodate growing data-communication demands generated by network consolidation as in Fibre Channel over Ethernet (FCoE), have a compact, low-power-consumption design, and have switch control software optimized for blade...

Quad Flat No-lead (QFN) presents an excellent example of a complex substrate composed of both ductile (copper) and brittle (plastic molding compound) materials, showing clear trends of reduction in package size and the combination ductile and brittle materials in the same sawing process which creates real challenges in term of sawing quality, blade life and throughput. This paper discussed on t...

When it comes to measuring blade-tip clearance or blade-tip timing in turbines, reflective intensity-modulated optical fiber sensors overcome several traditional limitations of capacitive, inductive or discharging probe sensors. This paper presents the signals and results corresponding to the third stage of a multistage turbine rig, obtained from a transonic wind-tunnel test. The probe is based...

Dans un article récent [1], Abderezak Ould Houcine montre qu’un groupe superstable résiduellement C pour une pseudo-variété C admet une série normale définissable G = G0⊲G1⊲· · ·⊲Gn telle que Gi/Gi+1 ∈ C pour i < n, et Gn est résoluble ; si G est ω-stable, on peut choisir Gn nilpotent. Nous étendons son résultat aux groupes supersimples, et montrons en même temps qu’on peut toujours prendre Gn ...

∗ This work is supported by the U. S. Department of Energy under Contract DE-AC04-94AL85000. Ψ This paper is declared a work of the U. S. Government and is not subject to copyright protection in the United States. ABSTRACT A fatigue test of a wind turbine blade was conducted at the National Renewable Energy Laboratory. Acoustic emission monitoring of the test was performed, starting with the se...

In this paper, the sensitivity of the structural integrity of wind turbine blades to debonding of the shear web from the spar cap was investigated. In this regard, modal analysis, static and fatigue testing were performed on a 45.7 m blade for three states of the blade: (i) as received blade (ii) when a crack of 200 mm was introduced between the web and the spar cap and (iii) when the crack was...

Introductions to Philosophy There are many good introductions to philosophy: [22], [53] and [1] have the advantage of being short and cheap. There are a few books [44, 11, 34] that introduce philosophical ideas by analysing films which raise philosophical issues. One of the advantages of these books is that they allow you to say that you are doing valuable research for this module while watchin...

The cause of crack initiation turbine blade had initially cracked by a fatigue mechanism over a period of time and then fractured by the overload at the last moment. Experimental procedure consists of macroscopic inspection, material verification, microscopic examination, and metallographic analysis and finally FE. And for these procedures, some specimens were prepared from a fractured blade. Us...

Materials used in the construction industry frequently contain large quantities of silica. When they are cut or shaped with power tools considerable respirable dust can be produced. Three dust control systems for use with cut-o€ saws have been evaluated on site: wet dust suppression using mains water, the same system using water from a portable water tank, and local exhaust ventilation. The ec...