Benefits of high speed interconnects to cluster file systems: a case study with Lustre

The method of analytical preconditioning combines the discretization and the analytical regularization of a singular integral equation in a single step. In a recent paper by the author, such a method has been applied to a spectral domain integral equation formulation devised to analyze the propagation in polygonal cross-section microstrip lines, which are widely used as high-speed interconnects in monolithic microwave and millimeter waves integrated circuits. By choosing analytically Fourier transformable expansion functions reconstructing the behavior of the fields on the wedges, fast convergence is achieved, and the convolution integrals are expressed in closed form. However, the coefficient matrix elements are one-dimensional improper integrals of oscillating and, in the worst cases, slowly decaying functions. In this paper, a novel technique for the efficient evaluation of such kind of integrals is proposed. By means of a procedure based on Cauchy integral theorem, the general coefficient matrix element is written as a linear combination of fast converging integrals. As shown in the numerical results section, the proposed technique always outperforms the analytical asymptotic acceleration technique, especially when highly accurate solutions are required.

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Defect investigation and replacement implementation of bearings for long-span continuous box girder bridges under operating high-speed railway networks: a case study

Structure and Infrastructure Engineering ◽

10.1080/15732479.2020.1867589 ◽

2021 ◽

pp. 1-16

Author(s):

Fengbo Ma ◽

Huile Li ◽

Shitong Hou ◽

Xuecheng Kang ◽

Gang Wu

Keyword(s):

High Speed ◽

Box Girder Bridges ◽

Box Girder ◽

High Speed Railway ◽

Girder Bridges ◽

Long Span ◽

Railway Networks ◽

Defect Investigation

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Influence of Hydrogeochemistry on Tunnel Drainage in Evaporitic Formations: El Regajal Tunnel Case Study (Aranjuez, Spain)

Sustainability ◽

10.3390/su13031505 ◽

2021 ◽

Vol 13 (3) ◽

pp. 1505

Author(s):

Ignacio Menéndez Pidal ◽

Jose Antonio Mancebo Piqueras ◽

Eugenio Sanz Pérez ◽

Clemente Sáenz Sanz

Keyword(s):

High Speed ◽

Civil Engineering ◽

Saturation Index ◽

The Subject ◽

Under Construction ◽

Underground Flow ◽

Very High ◽

Over Time

Many of the large number of underground works constructed or under construction in recent years are in unfavorable terrains facing unusual situations and construction conditions. This is the case of the subject under study in this paper: a tunnel excavated in evaporitic rocks that experienced significant karstification problems very quickly over time. As a result of this situation, the causes that may underlie this rapid karstification are investigated and a novel methodology is presented in civil engineering where the use of saturation indices for the different mineral specimens present has been crucial. The drainage of the rock massif of El Regajal (Madrid-Toledo, Spain, in the Madrid-Valencia high-speed train line) was studied and permitted the in-situ study of the hydrogeochemical evolution of water flow in the Miocene evaporitic materials of the Tajo Basin as a full-scale testing laboratory, that are conforms as a whole, a single aquifer. The work provides a novel methodology based on the calculation of activities through the hydrogeochemical study of water samples in different piezometers, estimating the saturation index of different saline materials and the dissolution capacity of the brine, which is surprisingly very high despite the high electrical conductivity. The circulating brine appears unsaturated with respect to thenardite, mirabilite, epsomite, glauberite, and halite. The alteration of the underground flow and the consequent renewal of the water of the aquifer by the infiltration water of rain and irrigation is the cause of the hydrogeochemical imbalance and the modification of the characteristics of the massif. These modifications include very important loss of material by dissolution, altering the resistance of the terrain and the increase of the porosity. Simultaneously, different expansive and recrystallization processes that decrease the porosity of the massif were identified in the present work. The hydrogeochemical study allows the evolution of these phenomena to be followed over time, and this, in turn, may facilitate the implementation of preventive works in civil engineering.

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Removing W Polymer Residue from BEOL Structures Using DSP+ (Dilute Sulfuric-Peroxide-HF) Mixture – A Case Study

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.195.128 ◽

2012 ◽

Vol 195 ◽

pp. 128-131 ◽

Cited By ~ 1

Author(s):

Hun Hee Lee ◽

Min Sang Yun ◽

Hyun Wook Lee ◽

Jin Goo Park

Keyword(s):

High Speed ◽

Semiconductor Device ◽

Environmental Issues ◽

Low Power Consumption ◽

Device Performance ◽

Metal Gate ◽

Feature Size ◽

High K ◽

Removal Of Metal

As the feature size of semiconductor device shrinks continuously, various high-K metals for 3-D structures have been applied to improve the device performance, such as high speed and low power consumption. Metal gate fabrication requires the removal of metal and polymer residues after etching process without causing any undesired etching and corrosion of metals. The conventional sulfuric-peroxide mixture (SPM) has many disadvantages like the corrosion of metals, environmental issues etc., DSP+(dilute sulfuric-peroxide-HF mixture) chemical is currently used for the removal of post etch residues on device surface, to replace the conventional SPM cleaning [. Due to the increased usage of metal gate in devices in recent times, the application of DSP+chemicals for cleaning processes also increases [.

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