Experimental evaluation of an unstable ring resonator with 90° beam rotation: HiQ experimental results

1988 ◽  
Vol 27 (21) ◽  
pp. 4396 ◽  
Author(s):  
Scott Holswade ◽  
Rafael Riviere ◽  
Carl A. Huguley ◽  
Christopher M. Clayton ◽  
Greg C. Dente
Keyword(s):  
Experimental Evaluation ◽  
Ring Resonator ◽  
Experimental Results ◽  
Beam Rotation

Experimental Evaluation of Glob-top Materials for use in Harsh Environments

2005 ◽  
Vol 2 (4) ◽  
pp. 253-268 ◽  
Author(s):  
Mats Lindgren ◽  
Ilja Belov ◽  
Peter Leisner
Keyword(s):  
Process Parameters ◽  
Experimental Evaluation ◽  
Experimental Results ◽  
Polymer Materials ◽  
Harsh Environments ◽  
Automotive Applications ◽  
Critical Material ◽  
Material Evaluation

This article presents results of experimental evaluation of glob-top materials for multi-chip-modules (MCM) in harsh environments. Material and process tests have been performed with the purpose to find a material which would fulfill the reliability requirements for use e.g. in military or automotive applications. Seven polymer materials, i.e. four epoxies, two silicones and one polyurethane material have been selected and evaluated in the experiments. The most critical material and process parameters for glob-top have been identified and measured. Based on the experimental results, application-based scoring of studied epoxy materials has been performed. Material evaluation results have been summarized in conclusions about the most suitable glob-top material for use in harsh environments.

Automatic term recognition based on statistics of compound nouns

Terminology ◽  
2000 ◽  
Vol 6 (2) ◽  
pp. 195-210 ◽  
Author(s):  
Hiroshi Nakagawa
Keyword(s):  
Experimental Evaluation ◽  
Extraction Method ◽  
Recognition Task ◽  
Experimental Results ◽  
Test Collection ◽  
Term Extraction ◽  
Academic Conference ◽  
Compound Nouns ◽  
Automatic Term Recognition ◽  
Technical Terms

The NTCIR1 TMREC group called for participation of the term recognition task which is a part of NTCIR1 held in 1999. As an activity of TMREC, they have provided us with the test collection of the term recognition task. The goal of this task is to automatically recognize and extract terms from the text corpus which consists of 1,870 abstracts gathered from the NACSIS Academic Conference Database. This article describes the term extraction method we have proposed to extract terms consisting of simple and compound nouns and the experimental evaluation of the proposed method with this NTCIR TMREC test collection. The basic idea of scoring a simple noun N of our term extraction method is to count how many nouns are conjoined with N to make compound nouns. Then we extend this score to measure the score of compound nouns because most of technical terms are compound nouns. Our method has a parameter to tune the degree of preference either for longer compound nouns or for shorter compound nouns. As for term candidates, in addition to noun sequences, we may add variations such as patterns of "A no B" that roughly means "B of A" or "A’ś B" and/or "A na B" where "A na" is an adjective. Experimental results of our method are promising, namely recall of 0.83, precision of 0.46 and F-value of 0.59 for exactly matched extracted terms when we take into account top scoring 16,000 extracted terms.

Unstable ring resonator with a compact output beam: description and experimental evaluation

1988 ◽  
Vol 27 (13) ◽  
pp. 2694 ◽  
Author(s):  
Kenneth R. Calahan ◽  
Christopher M. Clayton ◽  
Alan H. Paxton
Keyword(s):  
Experimental Evaluation ◽  
Ring Resonator ◽  
Output Beam

Experimental investigation of an unstable ring resonator with 90-deg beam rotation for a chemical oxygen iodine laser

1999 ◽  
Vol 38 (15) ◽  
pp. 3249 ◽  
Author(s):  
Yuqi Jin ◽  
Bailing Yang ◽  
Fengting Sang ◽  
Dazheng Zhou ◽  
Liping Duo ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Ring Resonator ◽  
Iodine Laser ◽  
Chemical Oxygen Iodine Laser ◽  
Beam Rotation

An Experimental Study of Ammonia Receiver Geometries for Dish Concentrators

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Rebecca Dunn ◽  
Keith Lovegrove ◽  
Greg Burgess ◽  
John Pye
Keyword(s):  
Experimental Study ◽  
Energy Conversion ◽  
Experimental Evaluation ◽  
Second Generation ◽  
Experimental Results ◽  
Efficiency Gain ◽  
Efficiency Gains ◽  
Conical Shape ◽  
Chemical Efficiency ◽  
National University

This paper presents experimental evaluation of ammonia receiver geometries with a 9 m2 dish concentrator. The experiments involved varying the geometric arrangement of reactor tubes in a thermochemical reactor built from a series of tubes arranged in a conical shape inside a cavity receiver. Differences in conical arrangement were found to affect the efficiency of energy conversion. The solar-to-chemical efficiency gain obtained by varying the receiver geometry was up to 7% absolute. From this, it is apparent that geometric optimizations are worth pursuing since the resulting efficiency gains are achieved with no increase in costs of manufacture for receivers. The experimental results and methodology can be used when developing receivers for larger dish concentrators, such as the second generation 500 m2 dish concentrator developed at the Australian National University.

Experimental Evaluation of the Preview Servo Scheme for a Two-Axis Positioning System

1984 ◽  
Vol 106 (1) ◽  
pp. 1-5 ◽  
Author(s):  
M. Tomizuka ◽  
D. Dornfeld ◽  
X.-Q. Bian ◽  
H.-G. Cai
Keyword(s):  
Kalman Filter ◽  
Kalman Filtering ◽  
Experimental Evaluation ◽  
Experimental Results ◽  
Positioning System ◽  
Velocity Control ◽  
Filtering Theory ◽  
On Line ◽  
Sharp Corners ◽  
Welding System

A preview servo scheme for position and velocity control is implemented on a two-axis welding table. The Kalman filtering theory is used to estimate the velocity from position measurements, and a cornering scheme is proposed to attain smaller path errors at sharp corners. The experimental results show that the preview-servo scheme with the Kalman filter and corner preview features is suitable for on-line control of the welding system.

Mathematical Modeling and Experimental Evaluation of the Stress in the Connecting Elements of the Rods at a Rotational-Impact Loading

2015 ◽  
Vol 770 ◽  
pp. 424-428
Author(s):  
Lev A. Saruev ◽  
Sergei S. Vasenin
Keyword(s):  
Mathematical Modeling ◽  
Impact Loading ◽  
Experimental Evaluation ◽  
Experimental Results ◽  
Threaded Joint ◽  
Tangential Stresses

The experimental results are presented for the research on stress in the connecting elements of the rods at a rotational-impact loading. The oscillograms are made demonstrating the power pulses and tangential stresses in the threaded joint.

Experimental evaluation of numerical errors for multi-physics coupling methods using disparate meshes

2017 ◽  
Vol 36 (5) ◽  
pp. 1517-1525
Author(s):  
Matthias Jüttner ◽  
Andreas Pflug ◽  
Markus Wick ◽  
Wolfgang M. Rucker
Keyword(s):  
Finite Element ◽  
Significant Influence ◽  
Experimental Evaluation ◽  
Experimental Results ◽  
Multiphysics Simulation ◽  
Content Type ◽  
Numerical Errors ◽  
Interpolation Methods ◽  
Coupling Methods ◽  
Multiphysics Coupling

Purpose Multiphysics problems are solved either with monolithic or segregated approaches. For accomplishing contrary discretisation requirements of the physics, disparate meshes are essential. This paper is comparing experimental results of different interpolation methods for a segregated coupling with monolithic approaches, implemented using a global and a local nearest neighbour method. The results show the significant influence of discretisation for multiphysics simulation. Design/methodology/approach Applying disparate meshes to the monolithic as well as the segregated calculation of finite element problems and evaluating the related numerical error is content of the contribution. This is done by an experimental evaluation of a source and a material coupling applied to a multiphysics problem. After an introduction to the topic, the evaluated multiphysics model is described based on two bidirectional coupled problems and its finite element representation. Afterwards, the considered methods for approximating the coupling are introduced. Then, the evaluated methods are described and the experimental results are discussed. A summary concludes this work. Findings An experimental evaluation of the numerical errors for different multiphysics coupling methods using disparate meshes is presented based on a bidirectional electro-thermal simulation. Different methods approximating the coupling values are introduced and challenges of applying these methods are given. It is also shown, that the approximation of the coupling integrals is expensive. Arguments for applying the different methods to the monolithic and the segregated solution strategies are given and applied on the example. The significant influence of the mesh density within the coupled meshes is shown. Since the projection and the interpolation methods do influence the result, a careful decision is advised. Originality/value In this contribution, existing coupling methods are described, applied and compared on their application for coupling disparate meshes within a multiphysics simulation. Knowing their performance is relevant when deciding for a monolithic or a segregated calculation approach with respect to physics dependent contrary discretisation requirements. To the authors’ knowledge, it is the first time these methods are compared with a focus on an application in multiphysics simulations and experimental results are discussed.

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