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| 1 | The variation of the estimated GPS instrumental bias and its possible connection with ionospheric variability显示文摘Based on the analysis of the satellite DCB data estimated by our method and the Center for Orbit Determination in Europe(CODE)from 1999 to 2011,the features of the temporal variation of differential code biases(DCB)are studied.Summarily,there are three types of variations in DCB on different time scales.The first one is the day-to-day variation that exhibits more obviously in solar maximum years.The second one is the variation with about one year periodic variation that behaves more obviously from 1999 to 2004.The last one is the monotonously descending tendency from 1999 to 2010.Considering the basic ionospheric approximation in DCB estimation method,the features of the variability of the ionospheric morphology from 1999to 2010 are also displayed based on the ionospheric characteristic parameters.It can be concluded that the day-to-day and annual variation of the estimated global positioning system(GPS).DCB is related to the ionospheric variability.The variation of DCBs on solar cycle time scale includes the real hardware DCBs and pseudo-DCBs induced by ionospheric variation.No doubt,these kinds of'pseudo'variations of DCB will affect the precision of ionospheric total electron content(TEC)derived from the GPS data.In addition,this study is helpful for evaluating the influence of ionospheric weather on TEC derivation and is also useful for developing one estimation method of DCB with more stability and precision through introducing a more practical ionospheric model. | ZHANG DongHe SHI Hao JIN YaQi ZHANG Wei HAO YongQiang XIAO Zuo | 2014 | Science China(Technological Sciences)2014，57，1： | 14 |
| 2 | The seasonal dependence of cycle slip occurrence of GPS data over China low latitude region显示文摘The relationship of daily accumulated cycle slip occurrence with the season is analyzed using the GPS data observed in six GPS stations located in China low latitude region in 2001. It is found that the seasonal dependence of cycle slip oc-currence is evident. The cycle slip mainly occurs during the periods of two equinox months (March to May and September to October), and some correlative changes of the cycle slip occurrences over all six stations are exhibited in some special days. Considering the diurnal dependence of cycle slip, it can be inferred that the cycle slip occurrence with certain elevation limitation is related with the iono-spheric irregularities over this region. | ZHANG DongHe FENG Man XIAO Zuo HAO YongQiang SHI LiQin YANG GuangLin SUO YuCheng | 2007 | Science China(Technological Sciences)2007，50，4： | 10 |
| 3 | Case study of ionospheric fluctuation over mid-latitude region during one large magnetic storm显示文摘From Nov. 6 to 10, 2004, a large number of solar events occurred, which triggered many solar flares and coronal mass ejections (CMEs). These CMEs caused two large geomagnetic storms and continuous energy proton events. During this period, one large positive ionospheric storm happened over the East-Asian region on Nov. 8, 2004. On Nov. 10, 2004, a strong spread-F was observed by the ionosonde located in the mid-latitude region of East China and Japan, and the ionospheric fluctuation over the ionosonde stations derived from GPS observation was also obvious. In this report, the characteristics of the spatial distribution of the ionosphere fluctuation and its temporal evolution are studied using the parameter of the rate of total electron content (ROT) derived from dual-frequency GPS measurement. Strong fluctuating activity of the ionosphere was found over the mid-latitude region in the southern and northern hemispheres between longitudes of 100°E and 180°E during the magnetic storm period on Nov. 10, 2004, and a regular movement of the disturbing region was observed. In the end, the reason of the ionospheric fluctuation during this magnetic storm is analyzed. | ZHANG DongHe MO XiaoHua A Ercha HAO YongQiang | 2012 | Science China(Technological Sciences)2012，55，5： | 10 |
| 4 | Singularities of de Sitter Gauss map of timelike hypersurface in Minkowski 4-space显示文摘We study the singularities of de Sitter Gauss map of timelike hypersurface in Minkowski 4-space through their contact with hyperplanes. | KONG LingLing PEI DongHe | 2008 | Science China Mathematics2008，51，2： | 9 |
| 5 | Study of the ionospheric TEC using GPS during the large solar flare burst on Nov. 6,1997显示文摘Using the data from 15 global positioning system (GPS) stations scattered between 28° N-45° N and 90° W- 77° E we obtained the total electron content (TEC) variations with time during a large solar flare. The results indicated that the flare makes the TEC of ionosphere increasing in a large spatial area. The amounts of the TEC enhancement are mainly determined by the local time of subionospheric point, and the largest TEC enhancement is about 2.5 TECU. It is also concluded that the TEC enhancement is not symmetrical about the local noon time, the TEC enhancement values during morning hours are larger than those of the afternoon hours. | Donghe Zhang Zuo Xiao | 2000 | Chinese Science Bulletin2000，45，19： | 9 |
| 6 | Anti-β2 glycoprotein I antibodies in complex with β2 glycoprotein I induce platelet activation via two receptors: apolipoprotein E receptor 2' and glycoprotein I ba显示文摘 | Wenjing Zhang Fei Gao Donghe Lu Na Sun Xiaoxue Yin Meili Jin Yanhong Liu | 2016 | Frontiers of Medicine2016，10，1： | 8 |
| 7 | The correlation of flare's location on solar disc and the sudden increase of total electron content显示文摘The correlation of flare’s location on solar disc with the value of sudden increase of total electron content is analyzed with flare’s parameters observed by GOES satellite from 1997 to 1999 and total electron content derived from GPS data observed by international GPS Service for Geo-dynamics. It is found that, besides the flare’s maximum X-ray flux, flare’s location on solar disc has some relation with the value of SITEC during the flare. The ionospheric response to a flare with a smaller maximum X-ray flux and nearer angular distance to the Sun’s central meridian line may be stronger than that of the flare with a larger maxi-mum X-ray flux and far angular distance. To the flares with the same class of maximum X-ray flux, the nearer the angu-lar distance to the Sun’s meridian, the stronger the ionospheric response. | ZHANG Donghe, XIAO Zuo & CHANG QingDepartment of Geophysics, Peking University, Beijing 100871, China Qingdao Research Center, China Research Insitute of Radio-wave Propagation, Qingdao 266071, China Department of Electronic Engineering, Beijing Universit | 2002 | Chinese Science Bulletin2002，47，1： | 8 |
| 8 | Singularities of lightlike hypersurface in semi-Euclidean 4-space with index 2显示文摘Anti de Sitter space is a maximally symmetric, vacuum solution of Einstein's field equation with an attractive cosmological constant, and is the hyperquadric of semi-Euclidean space with index 2. So it is meaningful to study the submanifold in semi-Euclidean 4-space with index 2. However, the research on the submanifold in semi-Euclidean 4-space with index 2 has not been found from theory of singularity until now. In this paper, as a generalization of the study on lightlike hypersurface in Minkowski space and a preparation for the further study on anti de Sitter space, the singularities of lightlike hypersurface and Lorentzian surface in semi- Euclidean 4-space with index 2 will be studied. To do this, we reveal the relationships between the singularity of distance-squared function and that of lightlike hypersurface. In addition some geometric properties of lightlike hypersurface and Lorentzian surface are studied from geometrical point of view. | PEI DongHe KONG LingLing SUN JianGuo WANG Qi | 2010 | Science China Mathematics2010，53，12： | 7 |
| 9 | Energetic particle radiations measured by particle detector on board CBERS-1 satellite显示文摘Using the data measured by energetic particle detector on board CBERS-01 and -02 for the past five years, statistics was made to show the general features of MeV electrons and protons along a solar synchronous orbit at an altitude of 780 km. This height is in the bottom region of the Earth's radiation belts. Detectors are inside the satellite cabinet and such continuous monitoring of particle radiation environment inside a satellite has seldom conducted so far. After a proper and careful treatment, it is indicated that the data inside satellite are well correlated with the radiation environment outside. Be-sides the agreement of the general distribution characteristics of energetic electrons and protons with similar observations from other satellites, attention is particularly paid to the disturbed conditions. Variations of particle fluxes are closely related with solar proton events, in general, electron fluxes of outer belt are well correlated with Dst index after three days' delay while the electron injection occurred almost at the same day during great magnetic storms. It is confirmed that both energetic electrons and protons appear in the Polar Cap region only after the solar proton events. | HAO YongQiang XIAO Zuo ZOU Hong ZHANG DongHe | 2007 | Chinese Science Bulletin2007，52，5： | 6 |
| 10 | Observational study of daytime ionospheric irregularities associated with typhoon显示文摘Spread-F is a manifestation of ionospheric irregularities and generally takes place at nighttime. However, it can also be observed seldom at daytime. It is recognized that acoustic gravity waves (AGWs) play an important role in triggering plasma instability which results in spread-F in the ionosphere. The typhoon is a main source of the AGWs. In this paper, two cases of ionospheric daytime spread-F in the period of typhoon were analyzed. One case was on July 29, 1988 and the other was on August 01, 1989. The results showed the following: 1) There were some wave-like disturbances appearing in the HF Doppler records firstly, consequently the Doppler echo traces became scattered, which indicated that the ionospheric spread-F was triggered; 2) the blurred echo traces in the both two cases appeared in the morning (08:30-11:30 Beijing time) and lasted for more than two hours; 3) with the blurred echoes gradually weakening, the traveling ionospheric disturbances (TIDs) still existed and became clearer; 4) the frequency shifts in the two cases were both positive, implying the effective reflecting surface of the radio wave in the ionosphere moved downwards. These results provide good observational evidence for daytime spread-F during the typhoon period in Asian region. | XIAO SalGuan SHI JianKui ZHANG DongHe HAO YongQiang HUANG WeiQuan | 2012 | Science China(Technological Sciences)2012，55，5： | 6 |
| 11 | Ionospheric absorption and planetary wave activity in East Asia sector显示文摘In this paper, we focus on ionospheric absorption in the East Asia sector, and look for manifestations of atmospheric influences in this area. First, a 4-year historical record of absorption measurement at Beijing is presented. This record was obtained by a sweep frequency technique, in which 27-days periodic variation of the absorption level was found to be dominant, appearing in most seasons except winters. Instead, unusual enhancements of the absorption level appeared in winters (winter anomaly), at the meantime the level varied with periods mainly in the range of 8-12 days. Comparing to 27-days period from the Sun, the shorter period oscillations should be related to planetary wave activities in lower atmosphere. Second, fmin data from 5 mid-latitude ionosondes in Japan were used as an indirect but long-term measurement. With the fmin data covering two solar cycles, disturbances with various periods were found to be active around solar maximum years, but the 8-12 days oscillations always existed in winter, showing seasonal dependence instead of connection to solar activity. These results given in this paper demonstrate seasonal and solar cycle-dependent features of the ionospheric absorption in East Asia sector, and confirm the existence of influence from atmosphere-ionosphere coupling in this area, as well as the relationship between ionospheric winter anomaly and planetary wave activity. | HAO YongQiang ZHANG DongHe | 2012 | Science China(Technological Sciences)2012，55，5： | 4 |
| 12 | Anti de Sitter horospherical flat timelike surfaces显示文摘We investigate a special timelike surfaces in Anti de Sitter 3-space.We call such a timelike surface an Anti de Sitter horospherical flat surface which belongs to a class of surfaces given by one parameter families of Anti de Sitter horocycle.We give a generic classification of singularities and study the geometric properties of such surfaces from the viewpoint of Legendrian singularity theory. | CHEN Liang IZUMIYA Shyuichi PEI DongHe SAJI Kentaro | 2014 | Science China Mathematics2014，57，9： | 4 |
| 13 | Meridional movement of northern and southern equatorial ionization anomaly crests in the East-Asian sector during 2002-2003SSW显示文摘The present paper investigates the asymmetrical variability of the location of the north and the south equatorial ionization anomaly(EIA) crests in the East-Asian sector,along with their association with simultaneous observations of equatorial electrojet(EEJ) strength,geomagnetic activity index,and solar flux index during the 2002-2003 sudden stratospheric wanning(SSW) event.Analysis of these observations indicates the existence of a large-scale quasi 16-day periodic meridional movement in both EIA crests,and also reveals a strong correlation between the quasi 16-day oscillation in geomagnetic latitudes of the EIA crest and EEJ strength.The latitude of the northern/southern EIA crest and the EEJ strength indicate that obvious synchronous periodic oscillations were in-phase in the northern and southern hemisphere when the SSW occurred.In addition,it is also found that both the EIA crest location and amplitude of the periodic movement of the EIA locations exhibit hemispheric asymmetry.The amplitude of the periodic movement of the EIA location in the southern hemisphere is larger than that of the northern hemisphere,and the southern EIA crest is further off from the equator than the north one.Understanding these asymmetries requires a combination of mechanisms that involve at least trans-equator meridional winds and the position of a sub-solar point;however,potential disturbances in neutral winds associated with the SSW may additionally complicate the equatorial ionospheric dynamics. | MO XiaoHua ZHANG DongHe Larisa GONCHARENKO ZHANG ShunRong HAO YongQiang XIAO Zuo PEI JiaZheng Akimasa YOSHIKAWA CHAU HaDuyen | 2017 | Science China Earth Sciences2017，60，4： | 3 |
| 14 | Particle bursts in the inner radiation belt related to global lightning activity显示文摘Particle bursts(PBs),the phenomena characterized by short-term increases of particle counting rates(CRs),were observed by space-borne radiation belt particle detectors.With the electron CR data obtained by National Oceanic and Atmospheric Administration(NOAA)-18 satellite,the occurrence of PBs in the inner belt(1 L 2 and B 20.5 T)were derived for years2006–2011.The monthly occurrence number of PBs exhibits a strong maximum in northern summer(May–August).In association with global lightning data,the seasonal occurrence of PBs is found to be consistent with the lightning activity,especially if only lightning flashes at latitudes>20°are taken into account.The positive correlation between PBs and mid-latitude lightning discharges indicates the role of lightning-induced whistler waves,and is consistent with the expected pitch-angle scattering by wave-particle interactions.The contribution of lightning is so significant that it forms a non-negligible seasonal background of PBs.If one connects PBs to seismoelectromagnetic emissions(SEME)in attempt to find the earthquake precursor,the lightning background needs to be considered with great care. | WU Fei HAO YongQiang ZHANG DongHe | 2013 | Science China(Technological Sciences)2013，56，11： | 3 |
| 15 | Investigation of RQD variation with scanline length and optimal threshold based on three-dimensional fracture network modeling显示文摘Rock-quality designation(RQD) plays a significant role in rock mass analysis and is an important parameter in geotechnical and geological engineering.However,the RQD variation with scanline length has not yet been comprehensively considered in RQD.In this study,three-dimensional fracture network modeling was used to simulate actual rock mass,and numerous scanlines were set in the fracture network for investigation on RQD variation.Models and equations(i.e.,models A-A,N-N,and A-A-S,as well as the Priest-Hudson and Sen-Kazi equations) were summarized for the study.A corrected equation was proposed to eliminate the errors from using the Priest-Hudson and Sen-Kazi equations.In addition,inhomogeneous and anisotropic features were investigated,and the optimal thresholds for RQD calculation were determined,which varied with the study orientation and rock mass feature.When the inhomogeneity was studied in the x direction,the optimal threshold was found to be 4 m.When anisotropy was studied,the optimal threshold was found to be 3 m. | ZHANG Wen CHEN JianPing WANG Qing MA DongHe NIU CenCen ZHANG Wu | 2013 | Chinese Science Bulletin2013，58，7： | 2 |
| 16 | Correlative ionospheric disturbances in the sunlit hemisphere during the flare on July 14,2000显示文摘Using GPS data obtained from GPS sites located on the sunlit hemisphere during the flare on July 14, 2000, the ionospheric response to the flare was analyzed. A kind of tiny correlative ionospheric fluctuations were revealed from the temporal total electron content (TEC) curves derived from GPS measurements, and the values of this kind of disturbances are about 1015 m-2. A comparative analysis of these disturbances and soft X-ray flux detected at GOES satellite during the flare is done. It is found that this kind of disturbances revealed in the temporal TEC curves did occur in a very large area of sunlit ionosphere and its behavior is mainly controlled by the characteristics of the flare’s extra radiation. Because the similar fluctuations are not found in the curve of soft X-ray flux, it is concluded that the flare extra radiation in EUV band should have corresponding fluctuations and it is the fluctuations that cause the TEC disturbances. The height, where the disturbances occur, should be in the F | ZHANG Donghe & XIAO ZuoDepartment of Geophysics, Peking University, Beijing 100871, China Qingdao Research Center, Chinese Research Institute of Radio-wave Propagation, Qingdao 266071, China Center for Space Science and Applied Research, Chinese Academy o | 2002 | Chinese Science Bulletin2002，47，12： | 2 |
| 17 | The estimation method of GPS instrumental biases显示文摘A model of estimating the global positioning system (GPS) instrumental biases and the methods to calculate the relative instrumental biases of satellite and receiver are presented. The calculated results of GPS instrumental biases, the relative instrumental biases of satellite and receiver, and total electron content (TEC) are also shown. Finally, the stability of GPS instrumental biases as well as that of satellite and receiver instrumental biases are evaluated, indicating that they are very stable during a period of two months and a half. | CHANG Qing ZHANG Donghe XIAO Zuo ZHANG Qishan | 2001 | Chinese Science Bulletin2001，46，3： | 2 |
| 18 | Weak Finite Determinacy of Relative Map-Germs显示文摘The weak finite determinacy of relative map-germs is studied. The authors first give the concept of weak finite determination, and then give several sufficient conditions for a relative map-germ to be weak finitely determined, which is an important complement to Mather's work. Moreover, as an application, it is proven that the relative stable map-germs are weak finitely determined. | Changmei SHI Donghe PEI | 2014 | Chinese Annals of Mathematics,Series B2014，35，6： | 2 |
| 19 | Prevalences of and risk factors for biliary stones and gallbladder polyps in a large Chinese population显示文摘 | QingXu Lian‐yuanTao QiaoWu FeiGao Feng‐liangZhang LiYuan Xiao‐dongHe | 2012 | HPB2012，，6： | 2 |
| 20 | Effect of duration, concentration, and timing of ionomycin and 6- dimethylaminopurine (6-DMAP) treatment on activation of goat oocytes显示文摘 | LANGC DONGH WUYG etal | 2005 | Mol Reprod Dev2005，71，： | 1 |
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