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| 1 | Detection and parameter estimation of multicomponent LFM signal based on the fractional Fourier transform显示文摘This paper presents a new method for the detection and parameter estimation of multicomponent LFM signals based on the fractional Fourier transform. For the optimization in the fractional Fourier domain, an algorithm based on Quasi-Newton method is proposed which consists of two steps of searching, leading to a reduction in computation without loss of accuracy. And for multicomponent signals, we further propose a signal separation technique in the fractional Fourier domain which can effectively suppress the interferences on the detection of the weak components brought by the stronger components. The statistical analysis of the estimate errors is also performed which perfects the method theoretically, and finally, simulation results are provided to show the validity of our method. | QI Lin1, 2, TAO Ran1, ZHOU Siyong1 & WANG Yue1 1. Department of Electronic Engineering, Beijing Institute of Technology, Beijing 100081, China 2. School of Information Engineering, Zhengzhou University, Zhengzhou 450052, China Correspondence should be addressed to QI Lin (email: qilin@bit.edu.cn) | 2004 | Science in China(Series F)2004，47，2： | 143 |
| 2 | New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision显示文摘Recent mapping in the Gangdese block has revealed many leucogranites that are similar to those in the High Himalaya. These leucogranites formed at ~140 Ma as indicated by monazite Th-Pb ion-microprobe dating and cooled at ~130 Ma as indicated by muscovite 40Ar/39Ar dating. In conjunction with previous structural and paleogeographic studies, the new data indicate that the Gangdese block underwent crustal thickening and associated exhumation during ~140-130 Ma. In this regard, the southern margin of Eurasia continent was comparable to the modern South American Altiplano-Puna plateau, the prime example of active ocean-continent subduction and associated thickened crust. Specifically, the early stages of crustal thickening and uplifting of the Gangdese block may result from subduction of the Neo-Tethyan Ocean. If the Tibetan Plateau would form by accretion of a series of blocks with thickened crust, an elevated topographic plateau similar to the Altiplano- Puna plateau had formed before collision between the Indian and Eurasian plates. Then the Tibetan Plateau would have quickly thickened, uplifted, and begun to extend soon after onset of the collision. Thus, the deformational mechanism of the Tibetan Plateau is not distributed shortening, but rather concentrating deformation within regions of thin crust between the accreted blocks. | DING Lin & LAI Qingzhou Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Correspondence should be addressed to Ding Lin (e-mail: dinglin@ mail.igcas.ac.cn) | 2003 | Chinese Science Bulletin2003，48，15： | 73 |
| 3 | Structural pattern of eastern Himalayan syntaxis in Namjagbarwa and its formation process显示文摘The structural pattern of the eastern Himalayan syntaxis in Namjagbarwa consists of two series of structures with different styles. One series compiles the earlier ductile contractional and lateral-slip deformation system, formed by nearly north-south shortening within the syntaxis, left-lateral and right-lateral slipping along its western and eastern boundaries respectively. They were possibly produced by the indentation of the Indian continent into Asian continent after India-Asia collision. The peak deformation-metamorphic ages in these structures are 62-60 Ma, ~23 Ma and ~13 Ma. The other series is composed of ductile-brittle normal faults distributing concentrically and dipping toward the outsides of Namjagbarwa Peak. They were probably the collapse structures caused by rapid uplift in a later time and the beginning ages for the normal faulting are about 7.3-6.3 Ma. | ZHANG Jinjiang, Jl Jianqing, ZHONG Dalai, DING Lin & HE Shundong1. Department of Geology, Peking University, Beijing 100871, China 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Correspondence should be addressed to Zhang Jinjiang (email: zhjj@pku.edu.cn) | 2004 | Science China Earth Sciences2004，47，2： | 34 |
| 4 | Siliceous microplankton fluxes and seasonal variations in the central South China Sea during 1993-1995: monsoon climate and ? Nino responses显示文摘Seasonal variations of radiolarian and diatom fluxes in the central South China Sea during 1993-1995 were overwhelmingly controlled by monsoon climate. Radiolarian and diatom increased obviously during the Northeast (from November to February) and Southwest (from June to September) monsoons and decreased during the periods between the monsoons. The change of circulation driven by the monsoons improved water exchange in the different areas that brought rich nutrient materials for the surface microplankton, thereby enhancing radiolarian and diatom fluxes. Variation of radiolarian flux coincided with organic carbon flux, surface primary and export productivities. High radiolarian flux corresponded to high surface primary productivity. Radiolarian and diatom fluxes raised abnormally during 1994-1995 could be attributed to the El Nino event during the period. | WANG Rujian, LIN Jun, ZHENG Lianfu, CHEN Ronghua & CHEN JianfangLaboratory of Marine Geology of MOE, Tongji University, Shanghai 200092, China The Key Laboratory of Submarine Geoscience, State Oceanic Administration, Hangzhou 310012, China Correspondence should be addressed to Wang Rujian | 2000 | Chinese Science Bulletin2000，45，23： | 10 |
| 5 | The record of paleoclimatic change from stalagmites and the determination of termination II in the south of Guizhou Province, China显示文摘A high-resolution climate record from 163.00 kaBP to 113.80 kaBP has been obtained through TIMS-U series dating and carbon and oxygen isotope analysis of the three large stalagmites from two caves in the south of Guizhou Province, China. The record of the oxygen isotopes from the stalagmites reveals that the undulation characteristics between the cooling event of the glacial period and the warming event of the interglacial period in the research area can compare well to those of ice cores, lake sediments, loess and deep sea sediments on the scale of ten-thousand years or millennium time scale. The climate undulation provided by the record of the stalagmites has a coherence with the global changes and a tele-connection to the paleoclimate changes in the north polar region. Our results suggest that the direct dynamics of paleo-monsoon circulation changes reflected in the record of the stalagmites might be caused by changes of the global ice volume, and in turn related to various factors, including the solar radiation strength at the mid-latitudes in the Northern Hemisphere, the southern extension of the ice-rafted event in the North Atlantic, and changes of the equatorial Pacific sea surface temperature at the low-latitudes. Using δ18O values, we have calculated the temperatures and the results show that the temperature difference between the penultimate glacial period (with an average temperature of 8.1℃, and a minimum temperature range from 0.65℃ to -1.43℃ at stage 6 ) and the last interglacial period (with an average temperature of 18.24℃ at sub-stage 5e ) was about 10℃. This temperature difference from the record of the stalagmites corresponds in general to the record temperature variation (about 10℃) of measured ice cores. The climate records from the three stalagmites in the two caves have shown that the circulation strength of the Asian summer monsoon and the winter monsoon in the penultimate glacial period and the last interglacial period had a clear change. With the TIMS-U series method, termination II of the penultimate glacial period has been precisely dated at an age of (129.28±1.10) kaBP for the three stalagmites in the south of Guizhou Province, China. This borderline age represents the beginning of the last interglacial period or the boundary between the Middle Pleistocene and the Late Pleistocene, and corresponds to the beginning age of the last interglacial period shown by the ice cores and in the SPECMAP curve of the marine oxygen isotopes. The chronology determination of termination II is not only of stratigraphic and chronological significance, but also lays an important foundation for discussing the short time scales of climate oscillation and rapidly changing events of paleoclimate in the circulation region of the East Asian monsoon. | ZHANG Meiliang, YUAN Daoxian1, LIN Yushi, CHENG Hai, QIN Jiaming &ZHANG HuilingKarst Dynamics Laboratory, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China Geography Department, Minnesota University, MN 55455, USA Correspondence should be addressed to Zhang Meiliang | 2004 | Science China Earth Sciences2004，47，1： | 9 |
| 6 | Identification and expression profiling of putative odorant-binding proteins in the malaria mosquitoes, Anopheles gambiae and A. arabiensis显示文摘Olfaction plays a major role in host-seeking behaviour of mosquitoes. An informat- ics-based genome-wide analysis of odorant-binding protein (OBP) homologues is under- taken, and 32 putative OBP genes in total in the whole genome sequences of Anopheles gam- biae are identified. Tissue-specific expression patterns of all A. gambiae OBP candidates are determined by semi-quantitative Reverse Transcription (RT)-PCR using mosquito actin gene a internal expression control standard. The results showed that 20 OBP candidates had strong expression in mosquito olfactory tissues (female antennae), which indicate that OBPs may play an important role in regulating mosquito olfactory behaviours. Species-specific expression pat- terns of all putative anopheline OBPs are also studied in two of the most important malaria vec- tors in A. gambiae complex, i.e. A. gambiae and A. arabiensis, which found 12 of the putative OBP genes examined displayed species-differential expression patterns. The cumulative relative expression intensity of the OBPs in A. arabiensis antennae was higher than that in A. gambiae (the ratio is 1441.45:1314.12), which might be due to their different host preference behaviour. While A. gambiae is a highly anthropophilic mosquito, A. arabiensis is more opportunistic (Vary- ing from anthropophilic to zoophilic). So the latter should need more OBPs to support its host selection preference. Identification of mosquito OBPs and verification of their tissue- and spe- cies-specific expression patterns represent the first step towards further molecular analysis of mosquito olfactory mechanism, such as recombinant expression and ligand identification. | LI Zhengxi1,Jing-Jiang ZHOU2,SHEN Zuorui1 & Lin FIELD2 1.Department of Entomology,China Agricultural Univeristy,Beijing 100094,China 2.Biological Chemistry Division, Rothamsted Research,Harpenden, Herts. AL5 2JQ, UK Correspondence should be addressed to Li Zhengxi | 2004 | Science China(Life Sciences)2004，47，6： | 7 |
| 7 | An initial discussion on major controlling factors on formation of coal-formed large-medium sas fields显示文摘The so-called 'large-medium gas field' means a gas field with proven reserves equal to or larger than 100×108 m3. Up to 1997, 23 coal-formed great-medium fields are discovered in China, excluding two in Taiwan Province. Their proven reserves take 50.9% in total natural gas reserves. Therefore, the coal-formed great-medium gas field plays a decisive role in natural gas reserves and the study of their controlling factors is very important both in theory and in practice. There are six major controlling factors on the formation of coal-formed large-medium gas fields: ( Ⅰ) The generating center of coal-formed gas and its surrounding area; (Ⅱ) low potential area; (Ⅲ) late pool-forming period; (Ⅳ) traps related to the paleo-uplifits in coal-formed gas area; (Ⅴ) above or between abnormally pressured compartments; (Ⅵ) faulted traps related to coal-bed. | DAI Jinxing, XIA Xinyu, HONG Feng, ZHAO Lin, SUN Dongmin & SHI XinResearch Institute of Petroleum Exploration and Development, Beijing 100083, China Correspondence should be addressed to Dai Jinxing | 2000 | Chinese Science Bulletin2000，45，5： | 4 |
| 8 | Undoped semi-insulating indium phosphide (InP) and its applications显示文摘 | DONG Hongwei, ZHAO Youwen, JIAO Jinghua, ZENG Yiping, LI Jimin & LIN Lanying Materials Science Center, Institute of Semiconductors, Chinese Acad-emy of Sciences, Beijing 100083, China Correspondence should be addressed to Dong Hongwei | 2003 | Chinese Science Bulletin2003，48，4： | 3 |
| 9 | Cloning and expression pattern of a dehydrin-like BDNI gene from drought-tolerant Boea crassifolia Hemsl.显示文摘A 500-bp cDNA fragment was amplified via RT-PCR from drought-induced total RNA of the drought-tolerant B. crassifolia Hemsl. using primers based on the sequence of published dehydrin conserved region. By using 5’ RACE, full-length coding region (1 148 bp) of BDN1 gene was produced. It is a new member of the dehydrin gene family. Southern analysis indicated that BDN1 is present in the 6. crassifolia genome as a single-copy gene. Northern analysis revealed that its expression is inducible by drought and cold stresses as well as ABA application. | ZHAO Huiwu, LIU Han, YU Haiyuan, HU Yuanlei, GAO Yin, LI Zhenyu & LIN ZhongpingNational Laboratory of Protein Engineering and Plant Genetic Engineering , Peking University, Beijing 100871, China Botanical Institute, Chinese Academy of Sciences, Beijing 100093, China Correspondence should be addressed to Lin Zhongping | 2000 | Chinese Science Bulletin2000，45，22： | 3 |
| 10 | Phase Diagram Prediction of the Al_2O_3-SiO_2-La_2O_3 System显示文摘Rare earth oxide systems Al2O3-La2O3 and SiO2-La2O3 were thermodynamically assessed and optimized with the substitution model. The obtained model parameters and Gibbs free energy of tine compounds and pure components were applied to the prediction of the liquidus surface and isothermal sections of Al2O3-SiO2-La2O3 | Lin LI and Zhujun TANG(Department of Materials Science & Engineering, Shanghai University, Shanghai 200072, China) To whom correspondence should be addressedE-mail: liling@public6.sta.net.cn Weiying SUN and Peiling WANG(Shanghai Institute of Ceramics, Chi | 1999 | Journal of Materials Science & Technology1999，15，5： | 3 |
| 11 | Neodymium cations Nd^(3+x) were transported to the interior of Euglena gracilis 277显示文摘Euglena gracilis 277, a unicellular green alga, demonstrated remarkable ability to transport Nd3+ to the cell compartments. For a given amount of Nd3+ and cells, the results of ICP-AES indicated that the cellular uptake of Nd3+ was independent of Nd3+ concentration in thebulk solution. The average uptake of Nd3+ per celi (mMd) is proportional to a parameter ξ-theratio of neodymium content to the celi counts of the system. A novel approach for probing cellular neodymium by tetraiodotetra chlorofluorescein (I4TCF) has been devised. Data derived from the cryosections of !4TCF-Nd3+ stained cells and EDAX of the fast freezing ultrathin cryosections indicate that Nd3+ is distributed over the celi compartments. Chloroplasts are the major compartments as the residence of Nd3+ in the alga. The transport should be against a concentration gradient of Nd3+ on the order of five, even higher. it is proposed that a calcium ion channel would play an important role in the Nd3+ transportation. | KANG Lin, SHEN Zhiqiang & JIN Chengzhi Institute of Genetics, State key Laboratory of Genetic Engineering, Fudan University, Shanghai 200433, China Research Centre of Analysis and Measurement, Fudan University, Shanghai 200433, China Correspondence should be addressed to Jin Chengzhi | 2000 | Chinese Science Bulletin2000，45，7： | 2 |
| 12 | Tetrachlorodibenzo-p-dioxin exposure alters radial arm maze performance and hippocampal morphology in female AhR+/mice显示文摘 | Powers BE Lin TM Vanka A | 2005 | Genes Brain Behav2005，4，： | 1 |
| 13 | Species-,serogroup-,and serovar-specific epitopes are juxtaposed in variable sequence region 4 of the major outer membrane proteins of some Chlamydia trachomatis serovars显示文摘 | Batteiger BE Lin PM Jones RB | 1996 | Infection and Immunity1996，64，7： | 1 |
| 14 | Frequen- cy-specific audiometry using steady-state responses显示文摘 | Lins OG Picton TW Boucher BE | 1996 | Ear Hear1996，17，2： | 1 |
| 15 | Tetrachlorodibenzo-p-dioxin exposure alters radial arm maze performance and hippocampal morphology in female AhR mice 显示文摘 | Power BE Lin TM Vanka A | 2005 | Genes Brain Behav2005，4，： | 1 |
| 16 | Efficacy and safety of telmisartan,a selectve AT1 receptor antagonist, compared with ena]april in elderly patients with primary hypertension显示文摘 | Karlberg BE Lins LE Hermansson K | 1999 | J Hypertens1999，17，2： | 1 |
| 17 | Mega mullions and mullion structure defining oceanic metamorphic core complexes on the Mid-Atlantic Ridge 显示文摘 | Tucholke BE Lin J Kleinrock M C | 1998 | Journal of Geophysical Research1998，103，： | 1 |
| 18 | Embellishment of microfluidic devices via femtosecond laser micronanofabrication for chip functionalization显示文摘 | Wang J He Y Xia H Niu LG Zhang R Chen QD Zhang YL Li YF Zeng SJ Qin J H Lin Be Sun HB | 2010 | Lab on A Chip2010，10，15： | 1 |
| 19 | Integrated precise orbit determination of Shenzhou IV unmanned spacecraft显示文摘Considering the characteristic orbit of Shenzhou IV spacecraft and the advantages and disadvantages of several types of domestic orbit measurements, a scheme of IPOD is determined, which uses GPS, SLR and USB observation data jointly plus precise ionosphere corrections to GPS observation data. IPOD system and mathematic models of OD are introduced. The results of different joint OD are analyzed using true observation data, and show that radial accuracy is better than 2 m. | L Congmin1,2, GU Yidong3, LIN Baojun3 & GUO Jiong3 1. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China 2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 3. General Establishment of Space Science and Application, Chinese Academy of Sciences, Beijing 100080, China Correspondence should be addressed to L Congmin | 2004 | Science China(Technological Sciences)2004，47，5： | 1 |
| 20 | Supramolecular interactions between fullerenes and porphyrins 显示文摘 | WANG Yi- be ZHEN Yang- lin | 2003 | J Am Chem Soc2003，125，： | 1 |
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