Age and growth of John Dory, Zeus faber (Linnaeus, 1758), in the East China Sea     

Yoneda  Michio; Yamasaki  Shunji; Yamamoto  Keisuke; Horikawa  Hiroshi; Matsuyama  Michiya 《ICES Journal of Marine Science》2002,59(4):749-756

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“三江源”夏季降水异常与大气环流异常的关系   总被引：1，自引：0，他引：1  

刘彩红  朱西德  石顺吉  徐明 《气象》2009,35(7):39-45

利用三江源地区14个站1961-2005年逐月降水资料,对全区近45年夏季降水异常的时空特征及与大气环流异常的关系进行了分析.结果表明,近45年来,三江源地区的夏季降水量具有良好的空间一致性,总体呈微弱的减少趋势,减少幅度为9mm/45a;三江源地区经历了5个干、湿交替的阶段,存在较明显的准2年、准4～6年的振荡周期,自1980年代中期后12～14年左右的周期信号较强;1968、1979及1986年是3个明显的气候突变点,小波分析结果与降水序列大-小-大-小-大的变化趋势及突变检验存在良好的对应关系.环流分析表明,三江源地区夏季旱、涝年份的大气环流配置形势在高度距平场、风场和温度场均呈反向变化,可作为强信号,对三江源夏季降水的异常预测起指示作用.  相似文献   

2005年南京市PM_(10)浓度时间序列分析   总被引：6，自引：2，他引：4  

任永建  周锁铨  石顺吉  拉巴 《气象科学》2009,29(3)

根据南京市2005年的PM10日均浓度和气象观测资料,利用Maflab小波分析工具,对PM10浓度的年时间序列进行分析,得出了该地区PM10日均浓度的变化规律：2—5月较大,6-9月较小,10—12月较大;并且全年共有5个突变点。结合HYSPLIT4污染扩散模式,对污染源进行追踪,结果表明：造成南京市大气污染主要有局地污染物的排放和外来污染物的输送两种类型;在垂直方向上,污染物的长距离输送一直稳定在低层。  相似文献   

Co-seismic displacements, folding and shortening structures along the Chelungpu surface rupture zone occurred during the 1999 Chi-Chi (Taiwan) earthquake     

A. Lin  T. Ouchi  A. Chen  T. Maruyama   《Tectonophysics》2001,330(3-4):225-244

A nearly 100-km-long surface rupture zone, called Chelungpu surface rupture zone, occurred mostly along the pre-existing Chelungpu fault on the northwestern side of Taiwan, accompanying the 1999 Chi-Chi Ms 7.6 earthquake. The Chelungpu surface rupture zone can be divided into four segments based on the characteristics of co-seismic displacements, geometry of the surface ruptures and geological structures. These segments generally show a right-step en echelon form and strike NE–SW to N–S, and dip to the east with angles ranging from 50 to 85°. The co-seismic flexural-slip folding structures commonly occurred in or near the surface rupture zone from a few meters to a few hundreds of meters in width, which have an orientation in fold axes parallel or oblique to the surface rupture zone. The displacements measured in the southern three segments are approximately 1.0–3.0 m horizontally and 2.0–4.0 m vertically. The largest displacements were measured in the northern segment, 11.1 m horizontally and 7.5 m vertically, respectively. The amount of co-seismic horizontal shortening caused by flexural-slip folding and reverse faulting in the surface rupture zone is generally less than 3 m. It is evident that the co-seismic displacements of the surface rupture zone are a quantitative surface indicator of the faulting process in the earthquake source fault. The relations between the geometry and geomorphology of the surface rupture zone, dips of the co-seismic faulting planes and the striations on the main fault planes generated during the co-seismic displacement, show that the Chelungpu surface rupture zone is a reverse fault zone with a large left-lateral component.  相似文献   

K-Ar dating studies of Ashigawa and Tokuwa granodiorite bodies and plutonic geochronology in the South Fossa Magna, central Japan     

Kazuo  Salto Koichi  Kato Shunji  Sugi 《Island Arc》1997,6(2):158-167

Abstract K-Ar age studies in the Ashigawa and the southern part of the Tokuwa granodioritic bodies, which consist of the southern part of the Kofu plutonic complex, revealed that they formed between 12 and 9 Ma. Quite a narrow range of ages obtained from the Ashigawa southernmost part of the Tokuwa pluton implies that they cooled rapidly. The southern part of the Tokuwa pluton, as a whole, shows a systematic age distribution with a decrease in age to the north. Compilation of currently available plutonic ages in the South Fossa Magna suggests that the plutonic activities occurred three times in this region. Episodic activity like this could be argued in relation to the tectonic development of this region.  相似文献   

Discovery of a large-scale clumpy structure around the Lynx supercluster at z∼ 1.27     

Fumiaki Nakata  Tadayuki Kodama  Kazuhiro Shimasaku  Mamoru Doi  Hisanori Furusawa  Masaru Hamabe  Masahiko Kimura  Yutaka Komiyama  Satoshi Miyazaki  Sadanori Okamura  Masami Ouchi †  Maki Sekiguchi  Yoshihiro Ueda  Masafumi Yagi  Naoki Yasuda 《Monthly notices of the Royal Astronomical Society》2005,357(4):1357-1362

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Modelling for prediction of global deforestation based on the growth of human population   总被引：1，自引：0，他引：1  

Krishna Pahari  Shunji Murai 《ISPRS Journal of Photogrammetry and Remote Sensing》1999,54(5-6)

Deforestation due to ever-increasing activities of the growing human population has been an issue of major concern for the global environment. It has been especially serious in the last several decades in the developing countries. A population-deforestation model has been developed by the authors to relate the population density with the cumulative forest loss, which is defined and computed as the total forest loss until 1990 since prior to human civilisation. NOAA-AVHRR-based land cover map and the FAO forest statistics have been used for 1990 land cover. A simulated land cover map, based on climatic data, is used for computing the natural land cover before the human impacts. With the 1990 land cover map as base and using the projected population growth, predictions are then made for deforestation until 2025 and 2050 in both spatial and statistical forms.  相似文献   

Development of polygon shift method for generating 3D view map of buildings     

Shunji Murai  Vivarad Phonekeo  Kunihiko Ono  Shigetaka Yasue 《ISPRS Journal of Photogrammetry and Remote Sensing》1999,54(5-6)

The authors have developed a new method termed “Polygon Shift Method” that enables the generation of a 3D view map of a city with tall buildings with a simplified procedure to shift a polygon and check the overlap between the original and shifted polygon. Boolean operations are applied with a newly defined “Fore or Aft” side and a “Depth Distance” that functionally express the visibility criteria or hidden point processing in the 3D view. Since the polygon shift method can be operated with a raster-based structure, the computer processing for generation of a 3D view map of buildings with shadow is simple and efficient.  相似文献   

地面点云处理系统集成研究与实现     

王真立  吴晓章  陈刚  杜顺季 《测绘通报》2017,(11):108-114

地面点云数据后处理及软件研制是制约地面三维激光扫描技术进一步发展的关键因素。本文集成Oracle存储、PCL模块点云算法、OpenGL三维显示技术,初步研发了一套集点云存储、处理、显示、查询功能于一体的地面点云处理系统。通过RIEGL VZ-400扫描的雕像测试点云,验证了本文提出的三种技术集成开发地面点云处理系统的可行性和系统功能的稳健性。为进一步研究地面点云数据处理系统提供有益的参考。  相似文献   

Flume experiments on the horizontal stream offset by strike‐slip faults     

Shunji Ouchi 《地球表面变化过程与地形》2004,29(2):161-173

Flume experiments, in which the middle section of an erosion channel is displaced horizontally, have been conducted to assess the response of streams to horizontal displacement by a strike‐slip fault. The experimental erosion channel was developed in a mixture of sand and clay, which provided relatively stable banks with its cohesiveness. Horizontal displacement of a strike‐slip fault perpendicular to the channel is expected to add a ?at section to its longitudinal pro?le along the fault line. The experimental stream eliminated this ?at section with downstream degradation, upstream aggradation, and lateral channel shift. As a result, a roughly continuous longitudinal pro?le was maintained. This maintenance of a continuous longitudinal pro?le along channel is considered to be the principle of stream response to horizontal displacement by a strike‐slip fault. Downstream degradation was the dominant process of this stream response in the overall tendency of erosion without sand supply. When the rate of fault displacement was low (long recurrence interval), the experimental stream eroded the fault surface, jutting laterally into the channel like a scarp, and de?ected the channel within the recurrence interval. This lateral channel shift gave some gradient to the reach created by fault displacement (offset reach), and the downstream degradation occurred as much as completing the remaining longitudinal pro?le adjustment. When the rate of fault displacement was high (short recurrence interval), the lateral erosion on the ?rst fault surface was interrupted by the next fault displacement. The displacement was then added incrementally to the existing channel offset making channel shift by lateral erosion increasingly dif?cult. The channel offset with sharp bends persisted without much modi?cation, and downstream degradation and upstream aggradation became evident with the effect of the offset channel course, which worked like a dam. In this case, a slight local convexity, which was incidentally formed by downstream degradation and upstream aggradation, tended to remain in the roughly continuous longitudinal pro?le, as long as the horizontal channel offset persisted. In either case, once the experimental stream obtained a roughly continuous gradient, further channel adjustment seemed to halt. Horizontal channel offset remained to a greater or lesser extent at the end of each run long after the last fault displacement. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献