A new method of gravity external correction for high precision gravity measurement

2014 ◽  
Vol 109 ◽  
pp. 301-312 ◽  
Author(s):  
Di Luo ◽  
Feng Cai ◽  
Zhan Liu
Keyword(s):  
High Precision ◽  
New Method ◽  
Gravity Measurement

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.

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. 

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.

High-precision measurements of tungsten stable isotopes and application to earth sciences

2014 ◽  
Vol 29 (12) ◽  
pp. 2284-2293 ◽  
Author(s):  
Thomas Breton ◽  
Ghylaine Quitté
Keyword(s):  
Earth Sciences ◽  
Stable Isotopes ◽  
High Precision ◽  
Small Mass ◽  
New Method ◽  
Precision Measurements ◽  
Environmental Sciences ◽  
Mass Dependent

A new method for high precision measurements of W stable isotopes by MC-ICPMS enables to discriminate small mass-dependent fractionations, with applications in numerous fields of earth, planetary and environmental sciences.

Sign in / Sign up

Export Citation Format

Share Document