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Combined adjustment project of national astronomical geodetic networks and 2000' national GPS control network

Progress in Natural Science:Materials International 2005年第5期15卷 435-441页

作者： YANG Yuanxi1*, ZHA Ming2, SONG Lijie3. WEI Ziqing1, WANG Zhouping2, OUYANG Guichong2, XU Bilin2, WU Xiaoping3.and WANG Junqin4(1. Xi'an Research institute of Surveying and mapping, Xi'an 710054, china 2. Xi'an Informational and Technical Center of Surveying and mapping, Xi'an 710054, china 3. zhengzhou institute of Surveying and mapping, zhengzhou 450052, china 4. The First Surveying Team of Tianjin, Tianjin 3.0140, china) Xian Research institute of Surveying and mapping Xi''an 710054 China Xi''an Informational and Technical Center of Surveying and mapping Xi''an 710054 China zhengzhou institute of Surveying and mapping Zhengzhou 450052 China

The combined adjustment project of the nationwide astronomical geodetic networks and 2000' national GPS control network involve 48519 terrestrial observational stations and 2666 GPS observational stations. In the terrestrial network, 25107 stations are height fixed and 23.12 stations are in three dimensions. 440793.terrestrial observations and 183.68 unknowns are involved in the adjustment. The three-dimensional observational models for the adjustment have been established. The crustal deformation influences and corrections are researched. Fast methods of solving partitioned adjustment for super large-scale geodetic network have been studied. The standard deviations of three-dimensional coordinates for all stations are evaluated. As a result of the combined adjustment, a unified national geodetic network with nearly 50000 stations is established, the high accurate three-dimensional geocentric coordinates are obtained. The standard deviation for geoid is averagely 0.2 m, for vertical deflection is about 1.5″, for the horizontal position is about 0.12 m, for the geodetic height is about 0.14 m, and for the three-dimensional position is averagely 0.3.m.

关键词： astronomical geodetic network GPS network combined adjustment datum geocentric coordinates.

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A new learning statistic for adaptive filter based on predicted residuals

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Progress in Natural Science:Materials International 2006年第8期16卷 833-837页

作者： YANG Yuanxi and GAO Weiguang (Xi'an Research institute of Surveying and mapping, Xi'an710054, china institute of Surveying and mapping, University of Information Engineering, zhengzhou 450052, china) Xi''an Research institute of Surveying and mapping Xi''an 710054 China. institute of Surveying and mapping University of Information Engineering Zhengzhou 450052 China

A key problem for an adaptive filter is to establish a suitable adaptive factor for balancing the contributions of the measurements and the predicted state information from some kinematic models. The reasonable adaptive factor needs a reliable learning statistics to judge the state kinematic model errors. After analyzing the existing two kinds of learning statistics based on the state discrepancy and variance component ratio, a new learning statistic based on predicted residuals is set up, which is different from the exiting learning statistics. The new learning statistic does not need to estimate the kinemetic state parameters before the filtering process, Of course, it does not need necessary measurements to estimate state parameters for all observation epochs. The new learning statistic can be applied together with the learning factor constructed by the state discrepancy. The advantages and shortcomings of the new learning factor are analyzed, and an example is given.

关键词： adaptive factor adaptive filter kinematic model predicted residual.

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The gravitational gradient tensor’s invariants and the related boundary conditions

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Science china Earth Sciences 2010年第5期53卷 781-790页

作者： YU JinHai1,2,3.& ZHAO DongMing4 1 College of Earth Science, Graduate University of Chinese Academy of Sciences, Beijing 100049, china 2 institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 43.077, china 3.State Key Laboratory of Astronautic Dynamics, Xi’an 710043. china 4 zhengzhou institute of Surveying and mapping, zhengzhou 450052, china College of Earth Science Graduate University of Chinese Academy of Sciences Beijing China institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China State Key Laboratory of Astronautic Dynamics Xi’an China zhengzhou institute of Surveying and mapping Zhengzhou China

Here we report new approaches of recovering the Earth gravitational field from GOCE (Gravity field and steady-state Ocean Circulation Explorer) gradiometric data with the help of the gradient tensor’s invariants. Our results only depend on GOCE satellite’s position and gradiometry, in other words, they are completely independent of the satellite attitude. First, starting from the invariants, linearization models are established, which can be referred as the general boundary conditions on the satellite’s orbit. Then, the spherical approximation expressions for the models are derived, and the corresponding solving methods for them are discussed. Furthermore, considering effects of J2-term, the spherical approximation models are improved so that the accuracies of the boundary conditions can be theoretically raised to O ( J 2/2 T), which is approximately equivalent to O(T2). Finally, some arithmetic examples are constructed from EGM96 model based on the derived theories, and the computational results illustrate that the spherical models have accuracies of 10-7 and the order recovering the gravitational field can reach up to 200, and the models with regard to effect of J2-term have accuracies of 10-8 and the order can reach up to 280.

关键词： the Earth’s gravitational field gravitational gravidiometry tensor’s invariant

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Main chemical ingredients of the celadon glaze from Qingliangsi kiln and Zhanggongxiang kiln

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Science china(Physics,Mechanics & Astronomy) 2006年第4期49卷 487-495页

作者： ZHAO Weijuan1, LU Xiaoke1, LI Guoxia1, GUO Min1, XIE Jianzhong1, GAO Zhengyao1, SUN Xinmin2, GUO Musen2, CHENG Huansheng3.& ZHANG Bin3.1. Faculty of Physical Engineering, zhengzhou University, zhengzhou 450052, china 2. Research {3. of Cultural Relic and Archaeology, Henan Province, zhengzhou 450004, china 3. Research {3. of Modern Physics, Fudan University, Shanghai 20043., china Faculty of Physical Engineering Zhengzhou University Zhengzhou 450052 China

The proton induced X-ray emission (PIXE) is used to determine the chemical ingredients of seven main elements in the samples of Ru Guan porcelain glazes and Ru Civil porcelain from Qingliangsi kiln in Baofeng County and the samples of celadon glaze from Zhanggongxiang kiln in Ruzhou City. The PIXE data are then analyzed by scatter analysis and fuzzy cluster method for determining their classification and provenance. The results show that there are obvious differences between the ingredients of glaze material of Ru Guan porcelain and Ru Civil porcelain from Qingliangsi kiln, of which the former ingredients are stable and its source is localized, and that the sources and ingredients of the glaze of Ru Guan porcelain and those of celadon glaze from Zhanggongxiang kiln are not wholly the same, of which the latter sources are much scattering.

关键词： Zhanggongxiang kiln, Qingliangsi kiln, the source of raw material, the proton induced X-ray emission.

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Proton induced X-ray emission (PIXE) analysis of sources of porcelain body of Ru Guan and Jun Guan porcelains

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Science china(Physics,Mechanics & Astronomy) 2006年第4期49卷 411-420页

作者： LI Guoxia1, ZHAO Weijuan1, LI Rongwu2, SUN Hongwei1, GUO Min1, WANG Yanfang1, LIU Hui1, ZHAO Qingyun3. SUN Xinmin3. ZHAO Wenjun3.& CHENG Huansheng4 1. Faculty of Physical Engineering, zhengzhou University, zhengzhou 450052, china 2. Department of Physics, Beijing Normal University, Beijing 100875, china 3. institute of Cultural Relic and Archaeology of Henan Province, zhengzhou 450000, china 4. institute of Modern Physics, Fudan University, Shanghai 20043., china Faculty of Physical Engineering Zhengzhou University Zhengzhou China Department of Physics Beijing Normal University Beijing China institute of Cultural Relic and Archaeology of Henan Province Zhengzhou China institute of Modern Physics Fudan University Shanghai China

3. samples of Ru Guan porcelain body and 50 samples of Jun Guan porcelain body (both kinds being in different body colors) were selected with the purpose of finding out the source of raw materials and their classification relationship so as to search for ways of non-destructive discrimination. Proton induced X-ray emission (PIXE) has been applied to these samples to determine their chemical elements. The data of seven major chemical elements collected from these samples were further studied through fuzzy cluster analysis. Results indicate that the origin of raw materials of Jun Guan porcelain body samples is comparatively more concentrated in certain places, while that of Ru Guan porcelain body samples is scattered about. The places of origin of raw materials of the majority of Ru Guan and Jun Guan porcelain body samples have something in common, but some differences still exist. It might be an important way for non-destructive discrimination among Ru Guan and Jun Guan porcelains by combining PIXE with fuzzy cluster analysis.

关键词： Ru Guan and Jun Guan porcelain, source of porcelain body, PIXE, fuzzy cluster analysis, non-destructive discrimination.

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Design and verification of an FPGA programmable logic element based on Sense-Switch pFLASH

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Frontiers of Information Technology & Electronic Engineering 2024年第4期25卷 485-499页

作者： zhengzhou CAO Guozhu LIU Yanfei ZHANG Yueer SHAN Yuting XU No.58 Research institute China Electronics Technology Group CorporationWuxi 214035China

This paper proposes a kind of programmable logic element(PLE)based on Sense-Switch pFLASH *** programming Sense-Switch pFLASH,all three-bit look-up table(LUT3.functions,partial four-bit look-up table(LUT4)functions,latch functions,and d flip flop(DFF)with enable and reset functions can be *** PLE uses a choice of operational logic(COOL)approach for the operation of logic functions,it allows any logic circuit to be implemented at any ratio of combinatorial logic to *** intrinsic property makes it close to the basic application specific integrated circuit(ASIC)cell in terms of fine granularity,thus allowing ASIC-like cell-based mappers to apply all their optimization *** measuring Sense-Switch pFLASH and PLE circuits,the results show that the“on”state driving current of the Sense-Switch pFLASH is about 245.52μA,and that the“off”state leakage current is about 0.1 *** programmable function of PLE works *** delay of the typical combinatorial logic operation AND3.is 0.69 ns,and the delay of the sequential logic operation DFF is 0.65 ns,both of which meet the requirements of the design technical index.

关键词： Field programmable gate array(FPGA) Programmable logic element(PLE) Boolean logic operation Look-up table Sense-Switch pFLASH Threshold voltage

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A　SUPERLINEARLY　CONVERGENT　GENERALIZED　GRADIENT　PROJECTION　ALGORITHMFOR　LINEARLY　CONSTRAINED　PROBLEMS

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Systems Science and Mathematical Sciences 1995年第4期8卷 299-310页

作者： HE Guoping GAO Ziyou(institute of Applied Mathematics,Academia Sinica,Beijing 100080,china)ZHU Jianqing (zhengzhou institute of Surveying and mapping,zhengzhou 450052,china) 中科院应用数学所北京解放军郑州测绘学院河南郑州 450052

Ａ　ＳＵＰＥＲＬＩＮＥＡＲＬＹＣＯＮＶＥＲＧＥＮＴＧＥＮＥＲＡＬＩＺＥＤＧＲＡＤＩＥＮＴＰＲＯＪＥＣＴＩＯＮＡＬＧＯＲＩＴＨＭＦＯＲＬＩＮＥＡＲＬＹＣＯＮＳＴＲＡＩＮＥＤ　ＰＲＯＢＬＥＭＳＮｅｗａｄｄｒｅｓｓ：Ｓｈａ... 详细信息

Ａ　ＳＵＰＥＲＬＩＮＥＡＲＬＹＣＯＮＶＥＲＧＥＮＴＧＥＮＥＲＡＬＩＺＥＤＧＲＡＤＩＥＮＴＰＲＯＪＥＣＴＩＯＮＡＬＧＯＲＩＴＨＭＦＯＲＬＩＮＥＡＲＬＹＣＯＮＳＴＲＡＩＮＥＤ　ＰＲＯＢＬＥＭＳＮｅｗａｄｄｒｅｓｓ：ＳｈａｎｄｏｎｇＭｉｎｉｎｇｉｎｓｔｉｔｕｔｅ，Ｓｈａｎｄｏｎｇ，Ｔａｉａｎ２７１０１９．＊Ｎｅｗａｄｄｒｅｓｓ：ＮｏｒｔｈｅｒｎＪｉａｏｔｏｎｇＵｎｉｖｅｒｓｉｔｙｌＢｅ１Ｊｉｎｇ１０００４０．ａｐｉｖｏｔｉｎｇｏｐｅｒａｔｉｏｎｉｎｏｒｄｅｒｔｏｄｅｔｅｒｍｉｎｅａｎｅ－ａｃｔｉｖｅｓｅｔｏｆｃｏｎｓｔｒａｉｎｔｓ．Ｓｅｃｏｎｄｌｙ，ｏｎｅｍｕｓｔｃｏｍｐｕｔｅａｎｅｗｐｒｏｊｅｃｔｉｏｎｍａｔｒｉｘａｔｅａｃｈｓｔｅｐ．Ｔｈｅｓｅａｒｅａｌｌｔｉｍｅ－－ｃｏｎｓｕｍｉｎｇａｎｄｏｆｔｅｎｍａｋｅｔｈｅａｌｇｏｒｉｔｈｍｔｏｂｅｕｎｓｔａｂｌｅ．ＩｎｔｈｉｓｐａｐｅｒｓｂｙｕｓｉｎｇｔｈｅｃｏｎｃｅｐｔｏｆｇｅｎｅｒａｌｉｚｅｄｐｒｏｊｅｃｔｉｏｎｍａｔｒｉＸｗｈｉｃｈｗａｓｐｒｏｐｏｓｅｄｉｎ［８］，ｗｅｉｍｐｒｏｖｅＷｕ＇ｓａｌｇｏｒｉｔｈｍａｎｄｐｒｅｓｅｎｔａｎｅｗａｌｇｏｒｉｔｈｍ．Ｕｎ?

关键词： Generalized gradient projection method linearly constrained problem superlinear convergence pivoting operation.

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Effect of Initial Microstructure on Warm Deformation Behavior of 45 Steel

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Journal of Iron and Steel Research International 2012年第8期19卷 75-78页

作者： ZHAO Xin1, YANG Xiao-ling2, JING Tian-fu3.(1. The Sixth Department, zhengzhou institute of Aeronautics, zhengzhou 450015, Henan,{3. 2. zhengzhou Zhongxing Basic Constructions Development Co Ltd, zhengzhou 450015, Henan,{3. 3. State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004, Hebei,{3.) The Sixth Department Zhengzhou Institute of Aeronautics Zhengzhou Henan China zhengzhou Zhongxing Basic Constructions Development Co Ltd Zhengzhou Henan China State Key Laboratory of Metastable Materials Science and Technology Qinhuangdao Hebei China

In order to investigate the effect of initial microstructure on warm deformation behavior, some specimens of 45 steel were annealed and some quenched. Then the specimens were isothermally compressed on a Gleeble 3.00 machine. The deformation temperature range was 550 to 700 ℃ and the strain rate range was 0.001 to 0.1 s-1. An optical microscope (OM) and a transmission electron microscope (TEM) were used to study the microstructures. The results show that the microstructure of annealed specimens is ferrite and pearlite and that of quenched specimens is martensite. The flow stress of quenched specimens is higher than that of annealed ones at 550 ℃ when strain rates are greater than 0.001 s-1. However, at 600 to 700 ℃ and strain rate of 0.001 s-1, the whole flow curves of quenched specimens are below that of annealed ones. Under the rest conditions, the flow stress of quenched specimens is higher at the beginning of compression and then the opposite is true after the strain is greater than a critical value. The microstructure examination proves that the tempering and dynamic recrystallization easily occur in the specimens with martensite during warm compression, which results in the above phenomena.

关键词： warm deformation flow stress steel microstructure

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National 2000' GPS control network of china

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Progress in Natural Science:Materials International 2007年第8期17卷 983-987页

作者： Yang Yuanxi~(1**) Tang Yingzhe~1 Chen Chuanlu~2 Wang Min~3.Zhang Peng~4 Wang Xiaorui~2 Song Lijie~5 Zhang Zusheng~6 (1.Xi'an Research institute of Surveying and mapping,Xi'an 710054,china 2.Geodetic Data Processing Center,Xi'an 710054,china 3.Center of Earthquake Analysis and Prediction,china Seismological Bureau,Beijing 10003.,china 4.National Geomatics Center of china,Beijing 100044,china 5.institute of Surveying and mapping,zhengzhou University of Information Engineering,zhengzhou 450052,china 6.First Crustal Deformation Monitoring Center,china Seismological Bureau,Tianjin 3.0180,china) Xi'' an Research institute of Surveying and mapping Xi'' an 710054 China Geodetic Data Processing Center Xi'' an 710054 China Center of Earthquake Analysis and Prediction China Seismological Bureau Beijing 100036 China National Geomatics Center of china Beijing 100044 China institute of Surveying and mapping Zhengzhou University of Information Engineering Zhengzhou 450052 China First Crustal Deformation Monitoring Center China Seismological Bureau Tianjin 300180 China

An accurately unified national GPS network with more than 2500 stations,named"National 2000' GPS Control Net- work",signed the epoch 2000.0,has been established by integrating the existing six nationwide GPS networks of china set up by differ- ent departments with different *** paper presents the characteristics of the existing GPS networks,summarizes the strategies in the integrated adjustment of the GPS network,including functional model,stochastic model as well as the adjustment principle modifi- *** modifying the adjustment strategies according to the characteristics of the existing GPS networks and under the support of the IGS stations,the accuracy of the integrated national GPS network is greatly *** datum differences among the sub networks disappear,the systematic error influences are weakened,and the effects of the outliers on the estimated coordinates and their variances are *** is shown that the average standard deviation for the horizontal component is smaller than 1.0 cm,the vertical component is smaller than 2.0 cm,and the three-dimensional (3.D) position of geocenter coordinates is smaller than 3.0 *** exterior checking ac- curacy for the 3.D position is averagely better than 1.0 cm.

关键词： GPS control network adjustment systematic errors robust estimation variance component estimation coordinate system

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Transport Properties of LCMO Granular Films Deposited by the Pulsed Electron Deposition Technique

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1027-1031页

作者：陈雷明 zhengzhou institute of Aeronautical Industry Management

By finely controlling the deposition parameters in the pulsed electron deposition process, granular La 2/3.Ca 1/3.MnO 3.（LCMO） film was grown on silicon substrates. The substrate temperature, ambient pressure in the deposition chamber and acceleration potential for the electron beam were all found to affect the grain size of the film, resulting in different morphologies of the samples. Transport properties of the obtained granular films, especially the magnetoresistance （MR）, were studied. Prominent low-field MR was observed in all samples, indicating the forming of grain boundaries in the sample. The low-field MR show great sensitive to the morphology evolution, which reaches the highest value of about 40% for the sample with the grain size of about 250 nm. More interestingly, positive-MR （p-MR） was also detected above 3.0 K when low magnetic field applying, whereas it disappeared with higher magnetic field applied up to 1.5 and 2 Tesla. Instead of the spin- polarized tunneling process being commonly regarded as a responsible reason, lattice mismatch between LCMO film and silicon substrate appears to be the origin of the p-MR

关键词： colossal magnetoresistance granular film transport properties

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