Search results for: Yongzhong Xu

Items from 1 to 13 out of 13 results

article

Three‐dimensional Modeling of Ore‐forming Elements and Mineralization Prognosis for the Yechangping Mo Deposit, Henan Province, China

Gaoming DING, Genyuan JI, Guolong YAN, Yongzhong XU, more

Acta Geologica Sinica ‐ English Edition > 98 > 3 > 736 - 752

Three‐dimensional geochemical modeling of ore‐forming elements is crucial for predicting deep mineralization. This approach provides key information for the quantitative prediction of deep mineral localization, three‐dimensional fine interpolation, analysis of spatial distribution patterns, and extraction of quantitative mineral‐seeking markers. The Yechangping molybdenum (Mo) deposit is a significant...

article

3D-RVSP experimental study above a carbonate outcrop for coal resource exploration

Mingshun Hu, Dongming Pan, Juanjuan Li, Hui Zhang, more

Acta Geophysica > 2019 > Vol. 67, no. 1 > 95--107

In the areas where carbonate rocks expose to the near surface, there are several intractable issues in conventional surface seismic, including (1) weak reflection energy, (2) complex wave field and (3) serious static correction. Therefore, the seismic imaging result suffers significantly. However, RVSP is able to achieve reflected data with high quality since it generates seismic waves in borehole...

article

3D-RVSP experimental study above a carbonate outcrop for coal resource exploration

Mingshun Hu, Dongming Pan, Juanjuan Li, Hui Zhang, more

Acta Geophysica > 2019 > 67 > 1 > 95-107

article

Particle swarm optimization and its application to seismic inversion of igneous rocks

Haijun Yang, Yongzhong Xu, Gengxin Peng, Guiping Yu, more

International Journal of Mining Science and Technology > 2017 > 27 > 2 > 349-357

In order to improve the fine structure inversion ability of igneous rocks for the exploration of underlying strata, based on particle swarm optimization (PSO), we have developed a method for seismic wave impedance inversion. Through numerical simulation, we tested the effects of different algorithm parameters and different model parameterization methods on PSO wave impedance inversion, and analyzed...

chapter

Study on Synthetic Evaluation of Human Performance in Manually Controlled Spacecraft Rendezvous and Docking Tasks

Ting Jiang, Chunhui Wang, Zhiqiang Tian, Yongzhong Xu, more

Lecture Notes in Computer Science > Digital Human Modeling > Cognitive Modeling > 387-393

Manual-Control Rendezvous and Docking (MCRVD) is a complex and demanding task which requires astronauts to control the direction of six-freedom of the spacecraft accurately by hand. Its performance has a close relationship among the design of the spacecraft HCI, the control ability of the astronaut, and the matching effect of the two factors above. In this paper, human performance for these tasks...

article

Integrative method in lithofacies characteristics and 3D velocity volume of the Permian igneous rocks in H area, Tarim Basin

Haijun Yang, Yongfu Liu, Huiwen Xie, Yongzhong Xu, more

International Journal of Mining Science and Technology > 2013 > 23 > 2 > 167-172

This paper introduces horizon control, seismic control, logging control and facies control methods through the application of the least squares fitting of logging curves, seismic inversion and facies-controlled techniques. Based on the microgeology and thin section analyses, the lithology, lithofacies and periods of the Permian igneous rocks are described in detail. The seismic inversion and facies-controlled...

article

Comparison between several multi-parameter seismic inversion methods in identifying plutonic igneous rocks

Haijun Yang, Yongzhong Xu, Zhibin Huang, Shizhong Chen, more

Mining Science and Technology (China) > 2011 > 21 > 3 > 325-331

With the objective of establishing the necessary conditions for 3-D seismic data from a Permian plutonic oilfield in western China, we compared the technology of several multi-parameter seismic inversion methods in identifying igneous rocks. The most often used inversion methods are Constrained Sparse Spike Inversion (CSSI), Artificial Neural Network Inversion (ANN) and GR Pseudo-impedance Inversion...

chapter

An IGSTK-based surgical navigation system connected with medical robot

Huoling Luo, Fucang Jia, Zhizeng Zheng, Qingmao Hu, more

2010 IEEE Youth Conference on Information, Computing and Telecommunications > 49 - 52

2010 IEEE Youth Conference on Information, Computing and Telecommunications (YC-ICT 2010)

A surgical navigation system based on IGSTK (Image-Guided Surgical Toolkit) that guide medical robot to drill pedicle screw into vertebra precisely is presented. The surgical location device used is NDI Polaris Vicra^® optical tracking system and the assistance robot is KUKA^® Robot KR 5 sixx R650. Message communication between the navigation system and KUKA robot is implemented based on OpenIGTLink...

article

Comparison between several seismic inversion methods and their application in mountainous coal fields of western China

Yongzhong XU, Tongjun CHEN, Shizhong CHEN, Weichuan HUANG, more

Mining Science and Technology (China) > 2010 > 20 > 4 > 585-590

With the objective of establishing the necessary conditions for 3D seismic data from mountainous areas in western China, we compared the application results of wave impedance technology in the lithology and exploration of coal fields. First, we introduce principles and features of three kinds of inversion methods. i.e., Model-Based Inversion, Constrained Sparse Spike Inversion (CSSI) and Geology-Seismic...

article

Influence of Monitoring Method and Control Complexity on Operator Performance in Manually Controlled Spacecraft Rendezvous and Docking

Yijing Zhang, Yongzhong Xu, Zhizhong Li, Jie Li, more

Tsinghua Science & Technology > 2008 > 13 > 5 > 619-624

This study focuses on the influence of the monitoring method and control complexity on the operator performance in manually controlled spacecraft rendezvous and docking (RVD). Two one-factor experiments were designed on a simulated RVD system. One examined the video guidance and periscope monitoring methods, and the other examined three control complexity levels using one-axis RVD control, two-axis...

article

An estimate on the blowing-up solutions of a fourth-order equation

Yongzhong Xu

Journal of Functional Analysis > 2007 > 251 > 1 > 360-375

In this short paper I prove a Harnack type inequality of the blowing-up solutions for a class of fourth-order equations with exponential growth on a compact four manifold. The main method I use is the moving-plane method.

article

Note on an inequality

Yongzhong Xu

Annales de l'Institut Henri Poincare / Analyse non lineaire > 2006 > 23 > 5 > 629-639

We prove in this article the case of three masses, of an inequality of discrete type (which might have a continuous extension) which is still a conjecture for any p points in R3. The inequality appears naturally in the derivation of Morse Lemma at infinity for Yamabe problems with changing signs. We also explain why this inequality might hold in general.

article

ExploringMycobacterium tuberculosis infection-induced alterations in gene expression in macrophage by microarray hybridization

Jianping Xie, Yao Li, Jun Yue, Yongzhong Xu, more

Science China Life Sciences > 2003 > 46 > 4 > 337-347

Tuberculosis remains a serious threat to public health. Its causative agentMycobacterium tuberculosis is an intracellular pathogen which survives and replicates within cells of the host immune system, primarily macrophages. Knowledge of the bacteria-macrophage interaction can help to develop novel measures to combat the disease. The global gene expression of macrophage following invasion by and growth...

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