|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Early-Mid Ordovician brachiopod diversification in South China显示文摘Affected by paleogeographic position, paleoclimatic condition and depositional environments, the increase of the Early-Mid Ordovician brachiopod diversity of South China commenced at the beginning of the Ordovician (early Tremadoc), accelerated from the Tetra- graptus approximatus Biozone (base of Arenig), and reached its first acme in the Didymograptus eobifidus Biozone (mid early Arenig) when the number of brachiopod genera was over 7 times as great as that at the start of the Ordovician. This was the first radiation in the history of brachiopod macroevolution in South China, which occurred nearly 5 graptolitic biozones earlier than the global trend of the great Ordovician biodiversification (in the lower part of the Undulograptus austrodentatus Biozone). It is also characterized by (1) the origination or first occurrences of some major groups, such as the punctate dalmanelloids and the pseudopunctate stro- phomenoids including Plectambonitoidea (cardinal process simple or absent) and Stro- phomenoidea (cardinal process bilobed) in South China; (2) niche expansion, particularly in the first occupation of deeper water benthic regimes by the Euorthisina-Nocturnellia Association developed at Houping, Chengkou, northern Chongqing; and (3) the differentiation of brachiopod faunas under different environmental conditions. The gradual and increasing separation from Gondwana may have been one of the factors responsible for the radiation in South China. | ZHAN Renbin, RONG Jiayu, CHENG Jinhui & CHEN Pengfei Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing 210008, China | 2005 | Science China Earth Sciences2005，48，5： | 14 |
| 2 | Recent progress in terahertz science and technology显示文摘The relatively new technique of coherent electromagnetic radiation, in the region of 1012 Hz, has potential to detect the nature of low energy processes in physics, chemistry and biomedicine. In this review article, an overview of recent progress of terahertz (THz) science and technology is presented. The development of the THz generation and detection system, the THz radiation applications which include THz time-domain spectroscopy and T-ray imaging, and the future potential of THz wave research are discussed. | XU Jingzhou, ZHANG Cunlin and ZHANG Xicheng(1. Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA 2. Department of Physics, Capital Normal University, Beijing 100037, China) | 2002 | Progress in Natural Science:Materials International2002，12，10： | 13 |
| 3 | A bi-directional gap model for simulating the directional thermal radiance of row crops显示文摘Row crops are a kind of typical vegetation canopy between discrete canopy and continuous canopy. Kimes et al. studied the directional thermal radiation of row crops using the geometrical optical model, which simplified row structure as 'box' and neglected the gap among foliage and did not consider the emissivity effects. In this work we take account of the gaps along illumination and viewing directions and propose a bi-direction gap model on the basis of the idea of gap probability of discrete vegetation canopy introduced by 'Li-Strahler' and inter-correlation of continuous vegetation developed by Kuusk. It can be used to explain 'hot spot' effects in thermal infrared region. The gap model has been validated by field experiment on winter wheat planted in shape of rows and results show that the gap model is better than Kimes' model in describing the directionality of thermal infrared emission for row crops. | CHEN Liangfu (陈良富) LIU Qinhuo (柳钦火) FAN Wenjie (范闻捷) LI Xiaowen (李小文) XIAO Qing (肖青) YAN Guangjian (闫广建) TIAN Guoliang (田国良) | 2002 | Science China Earth Sciences2002，45，12： | 12 |
| 4 | Synchrotron radiation X-ray diffraction in situ study of fine-grained minerals in shock veins of Suizhou meteorite显示文摘The synchrotron radiation X-ray diffraction technique developed for in situ study ahigh pressure and temperature has also been used to investigate microscopic mineral inclusionsin ultrahigh-pressure metamorphic rocks and deep-mantle samples. Present study added twomore examples of successful utilization of synchrotron radiation X-ray diffraction technique for insitu investigations of fine-grained (0.5―30 μm in size) minerals in very thin shock melt veins othe Suizhou meteorite: ( i ) X-ray diffraction measurement of extremely small-sized vein matrixminerals, and (ii) identification of the micron-sized new mineral tuite embedded in the vein matrixIt has been revealed that the fine-grained vein matrix consists of well crystallized garnet, kamacite and troilite, and the powder diffraction pattern consisting of 17 lines with d-values, intensities( I ), relative intensities (I/Io) and Miller indices, as well as the cell parameters for the new mineratuite has also been successfully obtained. The result of present investigations has enriched thecontent of dynamic high-pressure mineralogy and that of Earth’s mantle geochemistry. | XIE Xiande1, SHU Jinfu2 & CHEN Ming1 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USA Correspondence should be addressed to Xie Xiande | 2005 | Science China Earth Sciences2005，48，6： | 3 |
| 5 | SPACE LIFE SCIENCE IN 2000-2001显示文摘Chinese scientists studied some of the problems in the field of space life science and achieved success in the area during 2000-2001. Space biological experi ments were carried out in the orbit and the results of ground studies on protein crystallization, space radiation, space motion sickness were introduced in this paper. The influences of simulated weightlessness on the brain-function, the car diovascular, endocrine hormones, immunity, skeletal and muscle systems were presented. In addition, gravity medicine and space environment medicine, as well as countermeasures to space deconditioning, such as the traditional Chinese medicine, were also reported. | YANG Tiande SHEN Xianyun GU Dingliang XIAO Zhijun | 2002 | 空间科学学报2002，22，z1： | 0 |
| 6 | A Theoretical Model of Arc Light Radiation Based on GTA Spectral Diagnosis显示文摘An arc light radiation phenomenon in TIG welding process was studied through experiments and theoretical analysis.The arc spectra were acquired under a variety of welding parameters from 200 nm to 1000 nm wavelength rangein TIG. The influence of welding parameters on the arc radiation was discussed. The radiation energy from linesemission mechanisms was calculated and the comparison was made with the one from the continuum emissionmechanisms. The result shows that the radiation energy from the line emission mechanisms is equal to the one fromthe background. Based on the experiments and analysis, a physical model of arc light radiation has been developed.In this model. the arc plasma was presumed to be in local thermal equilibrium (LTE) with light thinness property.The Bolzmann distribution and Saha equation were applied to establish the arc light radiation model. This helps laythe foundation for further mathematical modeling of the arc light radiation. | Chenming XU Hongming GAO Guangjun ZHANG Lin WU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
| 7 | NOISE OF THE RING SPINNING FRAME AND ITS CONTROL显示文摘In this paper, we have made a study on the noise of ring spinning frame by analysing the noise radiating mechanism and the frequency spectrum of its main noise sources, such as the spindle system and the transmission gear trains of the ring frame. Finally, three measures for reducing its noise are suggested: (1) using upper elastic bearing for the spindle structure, (2) using vibration isolating washers for the spindle support, and (3) improving the gear transmission structure design in the headstock of the frame. | 管陆建 王绳武 | 1994 | Journal of China Textile University(English Edition)1994，11，2： | 0 |
| 8 | A STUDY OF HIGH LOFT NONWOVEN FABRICS USING POWDER BONDING TECHNOLOGY显示文摘In this paper, two types of high loft nonwoven fabrics have been constructed in the laboratory apparatus made by ourselves with different binders (polyamide and polyethylene powder) and varying binder contents (10%, 20%, 30% and 40%). The tensile and compression properties of these nonwoven fabrics were tested. It was found that one can reduce powder binder content to increase loft and softness of nonwoven fabrics, but it has to sacrifice its tensile strength. Adhesion force between binder and single fibre was also explored. The experiments showed that the adhesion force at the interface between binder and fibre depends on the fibre variety, the fibre surface morphology, heating temperature and heating time etc.. | 储才元 严灏景 | 1994 | Journal of China Textile University(English Edition)1994，11，1： | 0 |
| 9 | Particle tunnels across the horizon of Garfinkle-Horowitz-Strominger dilaton black hole显示文摘We promote the work of Parikh and Wilczek on the black hole radiation to the emission of massive and charged particles from Garfinkle-Horowitz-Strominger black hole. The energy and charge of the space-time are conservational during the course of the evaporation. The calculation shows that the emission spectrum is not precisely thermal, while has a correction, and the conclusion supports the view- point of information conservation. | FANG HengZhong1 & ZHAO Zheng2 1 Department of Physics, China University of Petroleum, Dongying 257061, China 2 Department of Physics, Beijing Normal University, Beijing 100875, China | 2007 | Science China(Physics,Mechanics & Astronomy)2007，50，5： | 0 |
| 10 | Theoretical and experimental investigation of holographic reconstruction and prediction of multi-source hybrid acoustic field显示文摘Study on a multi-source hybrid acoustic field is very important for nearfield acoustic holography (NAH) to be applied in the practical engineering field. In this paper, two methods based on the distributed source boundary point method (DSBPM) for holographic reconstruction and prediction of multi-source hybrid acoustic field, namely combination method with single surface measurement and combination method with multi-surface measurement, are proposed. Then, an experiment on two coherent speakers is carried out. By comparison of the reconstructed and predicted results and the actual measured results, the validity of the two methods and the superiority of the combination method with multi-surface measurement are proved. Considering the high sensitivity of the reconstructed results to measurement errors, the Tikhonov regularization method is proposed to stabilize the reconstruction procedure and restrict the influence of errors. And then, the optimal reconstructed results can be obtained and the reliability of holographic reconstruction and prediction is assured. | BI Chuanxing CHEN Jian CHEN Xinzhao YU Fei LI Weibing | 2005 | Science China(Physics,Mechanics & Astronomy)2005，48，3： | 0 |
| 11 | Investigation on non-LTE radiation emitted from a laser-irradiated Au disk显示文摘The spectral character of X-ray emitted from laser-irradiated gold disk is studied by using the one-dimensional non-LTE multigroup radiation transport hydrodynamics code RDMG. The applicability of the “three-temperature” model in which the radiation is described with thermal conduction approximation is checked. The simulation results show that the X-ray emitted from the laser-produced gold plasma is in non-LTE, and that the atom model has significant effect on the structure of X-ray spectrum. However, the plasma states, laser absorption efficiency and X-ray conversion efficiency, which are calculated with the “three-temperature” model, are almost the same as those with non-LTE multigroup radiation transport model. This fact indicates that the “three-temperature” model can be used to study plasma states and the energy distributions produced by a laser-irradiated high-Z target. This is meaningful to the 2-D or 3-D simulation. | GU Peijun PEI Wenbing FENG Tinggui WU Changshu | 2005 | Science China(Physics,Mechanics & Astronomy)2005，48，3： | 0 |
| 12 | Phase transition in layered perovskite-like manganate Ca_3Mn_2O_7 under high pressure显示文摘In situ high pressure energy dispersive X-ray diffraction measurements on the layered perovskite-like manganate Ca3Mn2O7 powder under pressures were performed by using the diamond anvil cell with synchrotron radiation. The results show that the structure of layered perovskite-like manganate Ca3Mn2O7 is unstable under pressure due to the easy compression of NaCl-type blocks. The structure of Ca3Mn2O7 underwent two phase transitions under pressures in the range of 0-35 GPa. One was at about 1.3 GPa with the crystal structure changing from tetragonal to orthorhombic. The other was at about 9.5 GPa with the crystal structure changing from orthorhombic back to another tetragonal. | 朱嘉林 陈良辰 禹日成 李凤英 刘景 靳常青 | 2002 | Science China Mathematics2002，45，7： | 0 |
| 13 | APPLICATION OF SURFACE GRAFTED POLY N-ISOPROPYL ACRYLAMIDE BY RADIATION TECHNOLOGY FOR PROTEIN SOLUTION CONCENTRATION显示文摘Poly N-isopropyl acrylamide (abbreviated as PNIPA) as a kind of thermally sensitive hydrogel is utilized to concentrate Bovin Serum Albumin (BSA) solution. In order to decrease its surface adsorption to BSA in aqueous solution, surface layer grafting of the gels by radiation technology was carried out. The results showed that hydroxyl propyl methacrylate (HPMA) grained gel exhibited a low level of BSA adsorption and still kept the original thermally sensitive properties of PNIPA hydrogels. | 孙以实 李怀忠 刘鹏飞 哈鸿飞 | 1991 | Chinese Journal of Polymer Science1991，9，4： | 0 |
| 14 | Preparation of Modified Poly(ethylene terephthalate) Fibers and Their Properties of Ultraviolet Radiation Protection显示文摘Protection against solar ultraviolet radiation (UVR)among the general public has been increasing steadily.Poly( ethylene terephthalate) (PET) was blended with UVR protection agent and was spun into the modified fibers with the properties of UVR protection. An investigation on the properties using an ultraviolet spectrophotometer showed that the modified PET fabrics could be resistant to UVR more than 90% in the band of UV-B. The effect of the heat insulation and the mechanical properties of the fibers were also studied. | Teng Cuiqing(滕翠青) Yu Muhuo(余木火) | 2001 | Journal of Donghua University(English Edition)2001，18，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员