scholarly journals New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique

2007 ◽  
Vol 60 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Akihisa Motoki ◽  
Giannis Hans Petrakis ◽  
Rodrigo Soares ◽  
Susanna Eleonora Sichel ◽  
José Ribeiro Aires
Keyword(s):  
High Precision ◽  
New Method ◽  
Digital Rock ◽  
Matrix Image ◽  
Modal Abundance ◽  
Rock Image ◽  
Graphic Processing

This paper proposes a new method for modal analyses of centimetric phenocrysts and porphyroblasts using a digital rock image. The dot matrix image of the rock is imported into vectorial draw software as background. The outline of all of the phenocrysts is marked on the overlay by closed vectorial curves and their internal area is painted in black. After this operation, the rock image on the background is deleted and the background is painted in white. The vectorial objects composed of the background and the overlay are exported as a matrix image of BMP format. The percentage of the areas painted in black corresponds to modal abundance of the phenocrysts, and it is calculated by the Wilber colour specification software. This method has high precision in graphic processing. However the translucency of the groundmass causes uncertainness in vectorial phenocryst marking. Therefore, it is recommended for rocks with phenocrysts larger than 5 mm.

Influence of Tooth Errors and Truing Principles of Grinding Wheel Abrasion for Machining Arc Enveloping Worm

2013 ◽  
Vol 652-654 ◽  
pp. 2153-2158
Author(s):  
Wu Ji Jiang ◽  
Jing Wei
Keyword(s):  
Mathematical Model ◽  
Case Studies ◽  
High Precision ◽  
High Performance ◽  
New Method ◽  
Grinding Wheel ◽  
Grinding Process ◽  
The Mathematical Model

Controlling the tooth errors induced by the variation of diameter of grinding wheel is the key problem in the process of ZC1 worm grinding. In this paper, the influence of tooth errors by d1, m and z1 as the grinding wheel diameter changes are analyzed based on the mathematical model of the grinding process. A new mathematical model and truing principle for the grinding wheel of ZC1 worm is presented. The shape grinding wheel truing of ZC1 worm is carried out according to the model. The validity and feasibility of the mathematical model is proved by case studies. The mathematical model presented in this paper provides a new method for reducing the tooth errors of ZC1 worm and it can meet the high-performance and high-precision requirements of ZC1 worm grinding.

scholarly journals A method to construct high-precision complex pore digital rock

2018 ◽  
Vol 15 (6) ◽  
pp. 2695-2703 ◽  
Author(s):  
Huaimin Dong ◽  
Jianmeng Sun ◽  
Naser Golsanami ◽  
Likai Cui ◽  
Liming Jiang ◽  
...  
Keyword(s):  
High Precision ◽  
Digital Rock

A new method for TIMS high precision analysis of Ba and Sr isotopes for cosmochemical studies

2017 ◽  
Vol 32 (7) ◽  
pp. 1388-1399 ◽  
Author(s):  
Elsa Yobregat ◽  
Caroline Fitoussi ◽  
Bernard Bourdon
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
High Precision ◽  
Thermal Ionization Mass Spectrometry ◽  
New Method ◽  
Ionization Mass ◽  
Sr Isotopes ◽  
Sr Resin ◽  
Thermal Ionization Mass ◽  
Isotope Measurements

A new protocol using Eichron™ Sr-resin for high-resolution Sr and Ba isotope measurements using thermal ionization mass spectrometry for cosmochemical samples.

scholarly journals High-precision Joint 2D Traveltime Calculation for Seismic Processing

2018 ◽  
Vol 22 (4) ◽  
pp. 327-334 ◽  
Author(s):  
Hui Sun ◽  
Fanchang Meng ◽  
Zhihou Zhang ◽  
Cheng Gao ◽  
Mingchen Liu
Keyword(s):  
High Precision ◽  
Calculation Method ◽  
Numerical Models ◽  
New Method ◽  
Fast Marching Method ◽  
Surrounding Area ◽  
Fast Marching ◽  
Seismic Processing ◽  
Grid Nodes ◽  
Marching Method

Fast Marching Method (FMM) boasts high calculation efficiency and strong adaptability and stability while being applied to seismic traveltime. However, when it is applied to the largescale model, the calculation precision of FMM is insufficient. FMM has poor calculation precision near the source, which is an essential reason for the low accuracy of the whole algorithm. This paper puts forward a joint traveltime calculation method to address the problem. Wavefront Construction (WFC) with a relatively high calculation accuracy rather than FMM is adopted for calculation of the grid nodes’ traveltime near the source. After that, FMM is used to calculate the seismic traveltime in the remaining area. Joint traveltime calculation method greatly improves the calculation accuracy of the source’s surrounding area and the calculation accuracy of FMM. According to the new method, FMM is still adopted for the calculation of most grid nodes in the model, so the high calculation efficiency of FMM is maintained. Multiple numerical models are utilized to verify the above conclusions in the paper. 

FAST AND HIGH PRECISION DIGITALLY RECONSTRUCTED RADIOGRAPH GENERATION ON GRAPHIC PROCESSING UNIT

2012 ◽  
Vol 24 (01) ◽  
pp. 9-15 ◽  
Author(s):  
Chi-Lin Yang ◽  
Been-Der Yang ◽  
Jaw-Lin Wang
Keyword(s):  
High Precision ◽  
Graphic Processing Unit ◽  
Processing Unit ◽  
Interactive Rendering ◽  
Varying Thickness ◽  
Ct Data ◽  
Bone Structures ◽  
Flexible Programming ◽  
The Sacrifice ◽  
Graphic Processing

Digitally reconstructed radiograph (DRR) from CT volumetric data has been used in numerous medical applications such as 3D treatment planning and CT-to-fluoroscopic alignment. The poor efficiency of the DRR generation is the main problem in such applications. Many researches have been attempted to accelerate the DRR calculation. However, the performance and precision cannot be achieved without the sacrifice of one or the other. In this study, a fast and high precision DRR generation method is proposed on a consumer PC platform. Instead of using CPU, the method takes the advantages of the powerful parallel computation and flexible programming capability of the graphic processing unit (GPU) to reach almost interactive rendering rate while maintaining 12-bit precision of the original CT data. This method can generate DRR images at 4.6 frames per second using 512 × 512 × 261 dataset in the 512 × 512 view port, and its precision is compatible to that generated by the CPU-based method. Besides, in order to simulate clinical radiograph images, a compensation filter is implemented in the DRR generation to compensate varying thickness of bone structures. The additional compensation filter can achieve a DRR image with more uniform optical density but takes no obvious performance overhead.

Settlement Prediction of Roadbed Based on Mixture Model with Exponential Curve and ANN

2013 ◽  
Vol 663 ◽  
pp. 76-79 ◽  
Author(s):  
Guo Heng Li ◽  
Han Bing Liu ◽  
Xu Xi Qin
Keyword(s):  
Mixture Model ◽  
High Precision ◽  
Measured Data ◽  
New Method ◽  
Settlement Prediction ◽  
Exponential Curve ◽  
Network Scale

A mixture method based on exponential curve and ANN is presented according to settlement prediction of roadbed with measured data. Based on this method, the rule of roadbed settlement is classified into sure part and uncertain part. Exponential curve is used to model the sure part, and ANN to model the uncertain part, thus the mixture settlement model can be obtained. Prediction results show that the mixture model has advantages of high precision and small network scale; it provides a new method for settlement prediction of roadbed.

A new method for high-resolution and high-precision analysis of flunitrazepam and 7-aminoflunitrazepam in human body fluids using a Monolithic SPE SpinTip and UPLC–Q-ToF–MS

2019 ◽  
Vol 37 (2) ◽  
pp. 387-397
Author(s):  
Masaya Fujishiro ◽  
Ai Noguchi ◽  
Xiao-Pen Lee ◽  
Chika Hasegawa ◽  
Takeshi Kumazawa ◽  
...  
Keyword(s):  
High Resolution ◽  
High Precision ◽  
Human Body ◽  
Body Fluids ◽  
New Method ◽  
Precision Analysis ◽  
Tof Ms

scholarly journals Analysis of high-precision vanadium isotope ratios by medium resolution MC-ICP-MS

2016 ◽  
Vol 31 (2) ◽  
pp. 531-536 ◽  
Author(s):  
Sune G. Nielsen ◽  
Jeremy D. Owens ◽  
Tristan J. Horner
Keyword(s):  
High Precision ◽  
Mass Spectrometer ◽  
Inductively Coupled Plasma ◽  
Isotope Ratios ◽  
Mass Resolution ◽  
New Method ◽  
Inductively Coupled ◽  
Medium Resolution ◽  
Medium Mass ◽  
Icp Ms

We present and verify a new method to measure vanadium isotope ratios using a Thermo Scientific Neptune multi-collector inductively-coupled plasma mass spectrometer (MC-ICP-MS) operated in medium mass resolution mode.

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