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Performance Analysis of MAC Protocol for LEO Satellite Networks  [PDF]
Mingxiang GUAN, Ruichun WANG
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.28091
Abstract: Considering that weak channel collision detection ability, long propagation delay and heavy load in LEO satellite communications, a valid adaptive APRMA MAC protocol was proposed. Different access probability functions for different services were obtained and appropriate access probabilities for voice and data users were updated slot by slot based on the estimation of the voice traffic and the channel status. In the proposed MAC protocol limited wireless resource is allocated reasonably by multiple users and high capacity was achieved. Three performance parameters: voice packet loss probability, average delay of data packets and throughput of data packets were considered in simulation. Finally simulation results demonstrated that the performance of system was improved by the APRMA compared with the conventional PRMA, with an acceptable trade-off between QoS of voice and delay of data.
Cost Model of the Product in Design Stage
Ying Liu,Ming Yu,Zuozhi Zhao,Ruichun Duan
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
To Develop Outsourcing: New Growth Point of Northeast China Using FDI
Ruichun Jiang
International Business Research , 2009, DOI: 10.5539/ibr.v3n1p162
Abstract: Outsourcing, as a new pattern of service industry in new century, has already become a hot spot of multinational corporations’ FDI (foreign direct investment). The execution of the Northeast revitalization strategy creates chances for enlarging the openness of outsourcing and developing the outsourcing by FDI. This paper analyzes the problems in the Northeast developing outsourcing and advances policy suggestions for driving the development of Northeast outsourcing.
The maximum coseismic vertical surface displacement and surface deformation pattern accompanying the Ms 8.0 Wenchuan earthquake
YongKang Ran,Xiang Shi,Hu Wang,LiChun Chen,Jie Chen,RuiChun Liu,Huiling Gong
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0453-3
Abstract: The amount of coseismic deformation and its distribution of the Wenchuan earthquake provide important scientific bases for revealing the mechanisms of earthquake preparation and characterizing the rupture propagation of the Wenchuan earthquake. The previous studies have indicated that the earthquake ruptured the middle-to-north segment of the Longmenshan central fault and the middle segment of the Longmenshan range-front fault, which are characterized by two surface rupture zones of 240 km and 90 km in length, respectively. Based on the pre-earthquake information and photos of landforms and buildings obtained through geologic and geomorphic survey of the area around Shaba Village of Beichuan County, Sichuan Province and the extensive interview with local villagers, we measured the displacements of the major terrain features and the dislocated buildings by total station instruments and differential GPS and obtained the maximum vertical displacement of 9±0.5 m and right-lateral displacement of 2±0.5 m around the Zou’s house in Shaba Village. Though the near-surface deformation exhibits a normal faulting around Shaba Village, the dynamic environment has not changed on the whole. The NW wall of the fault uplifted but without gravity gliding as normally occurring on the hanging wall of a normal fault, which proves that the 9±0.5 m displacement should be the maximum coseismic vertical displacement of the May 12, 2008 Ms 8.0 Wenchuan earthquake.
The maximum coseismic vertical surface displacement and surface deformation pattern accompanying the Ms 8.0 Wenchuan earthquake

RAN YongKang,SHI Xiang,WANG Hu,CHEN LiChun,CHEN Jie,LIU RuiChun &,GONG Huiling,

科学通报(英文版) , 2010,
Abstract: The amount of coseismic deformation and its distribution of the Wenchuan earthquake provide important scientific bases for revealing the mechanisms of earthquake preparation and characterizing the rupture propagation of the Wenchuan earthquake. The previous studies have indicated that the earthquake ruptured the middle-to-north segment of the Longmenshan central fault and the middle segment of the Longmenshan range-front fault, which are characterized by two surface rupture zones of 240 km and 90 km in leng...
U-Pb dating of detrital zircons from the Wudangshan Group in the South Qinling and its geological significance
WenLi Ling,RuiChun Duan,XiaoMing Liu,JianPing Cheng,XinWu Mao,LianHong Peng,ZaoXue Liu,HongMei Yang,BangFang Ren
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3095-6
Abstract: U-Pb dating was made by the LA-ICP-MS method for detrital zircons from the Wudangshan volcanic-sedimentary succession in the South Qinling. Samples comprise quartz sandstones of the Wudangshan Group collected from the base of the Yangping Formation and an upper layer of the Shuangtai Formation overlain its volcanic sequence, and two river-sand collections from the drainage systems cutting across the two formations, respectively. The results show that the Yangping detrital zircons are dominated by 830–780 Ma grains with a minor population of ~1.0–0.84 Ga and sporadic grains of ~2.6, ~2.4 and 2.0 Ga, whereas the Shuangtai zircons yield an upper intercept age of 763±33 Ma, identical to the timing of the Wudangshan volcanism within error, with few concordant grains of 1.9 and 0.86 Ga. Age spectra for the two river-sand samples are similar to those of the Yangping and Shuangtai Formations, respectively. It thus suggests that the Wudangshan strata are less than 780 Ma, whereas their major detrital zircon populations of 1.0–0.85 Ga and 830–780 Ma are consistent with timing of the Hannan magmatic activities along the northwestern margin of the South China Block. This suggests a Hannan or adjacent area provenance for the Wudangshan strata. The Wudang area is characterized by rift-related igneous events at ~755 and ~680 Ma, respectively, pointing to a tectono-magmatic history different from the Hannan area. It is inferred that the ~755 Ma magmatism is likely to indicate a separation of the South China Block from the supercontinent Rodinia, while the ~680 Ma event suggests a further split between the South Qinling and some unknown continent.
Timing of the Wudangshan, Yaolinghe volcanic sequences and mafic sills in South Qinling: U-Pb zircon geochronology and tectonic implication
WenLi Ling,BangFang Ren,RuiChun Duan,XiaoMing Liu,XinWu Mao,LianHong Peng,ZaoXue Liu,JianPing Cheng,HongMei Yang
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0269-6
Abstract: The Wudangshan, Yaolinghe volcanic-sedimentary sequences and doleritic-gabbroic sills comprise the largest exposed Precambrian basement in South Qinling. Zircons separated from 5 volcanic-pyroclastic samples of the Wudangshan Group, 2 volcanic samples of the Yaolinghe Group and one sample for the mafic sills were used for U-Pb dating by laser ablation-inductively coupled plasma mass spectrometry (LA-ICPMS). The results reveal that the Wudangshan volcanic sequence was formed at (755±3) Ma (a weighted mean from the 5 samples, MSWD=0.47), whereas the Yaolinghe volcanic suite and the mafic sill were crystallized at (685±5) (2 samples, MSWD=0.36) and (679±3) Ma (MSWD=1.6), respectively, which are equal to each other within analysis errors. These ages are markedly younger than those previously documented for the rocks. The newly obtained ages for the Wudangshan and Yaolinghe Groups are identical to those of the bottom Liantuo and slightly older than those of the Nantuo Formations, respectively, lower strata of the Nanhua (middle to late Neoproterozoic) stratotype section in eastern Three Gorges, Yangtze craton. A range of inherited magmatic zircons was recognized with ages of 830 to 780 Ma, which are typical of Neoprotzrozoic magmatisms recorded along the margins and interior of the Yangtze craton. Thus, there is Neoproterozoic basement comprising 830–780 Ma igneous suites in South Qinling; the inherited zircons were detrital sediments derived from the northern margin of the Yangtze craton. Accordingly, it is suggested that the South Qinling is a segment of the Yangtze craton before the Qinling Orogeny.
A Separating Algorithm for Overlapping Cell Images  [PDF]
Jinping Fan, Yonglin Zhang, Ruichun Wang, Shiguo Li
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.64023
Abstract:

The cell overlapping and adhesion phenomenon often exists in cell image processing. Separating overlapped cell into single ones is of great important and difficult in cell image quantitative analysis and automatic recognition. In this paper, an algorithm based on concave region extraction and erosion limit has been proposed to judge and separate overlapping cell images. Experimental results show that the proposed algorithm has a good separation effects on analog cell images. Then the method is applying in actual cervical cell image and obtains good separation result.

ANALYSIS OF CHARACTERISTICS OF PRECURSOR WAVE OF LOW FREQUENT IN SHANXI BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前山西前兆低频前驱波特征分析

Zhang Shuliang,Liu Ruichun,Ning Yaling,Tang Leili,Li Bin,
张淑亮
,刘瑞春,宁亚灵,唐垒黎,李斌

大地测量与地球动力学 , 2009,
Abstract: The changes of some precursory observation in Shanxi area before Wenchuan Ms8.0 earthquake on May 12,2008 were analysed,and following conclutions are drawn.Firstly,the precursor waves of low frequent are main characters of the precursory change before the earthquake,and its superior period are 64-128 min.Secondly,the distribution of the abnormal points is in the same direction with the primary rupture of Wenchuan Ms8.0 earthquake.Thirdly,low-frequency precursory waves occured in a crowded time,mainly from 1...
PRELIMINARY STUDY ON PALEOEARTHQUAKE AT BEICHUAN- DENGJIA SEGMENT ALONG THE CENTRAL FAULT OF LONGMEN MOUNTAIN
龙门山中央断裂北川-邓家一带古地震初步研究

Shi Xiang,Ran Yongkang,Chen Lichun,Wang Hu,Liu Ruichun,
史翔
,冉勇康,陈立春,王虎,刘瑞春

第四纪研究 , 2009,
Abstract: 龙门山断裂带是否存在类似汶川5.12大地震的地质记录,是地震科学工作者所关注的科学问题之一.处于中央断裂带中段和北段分界地区的北川一邓家一带,古地震研究对认识整个龙门山断裂带的大地震复发特征有重要意义.沿北川-邓家地震地表破裂带,可能有过早期活动,并兼顾是否有较多细粒第四纪沉积物,以便能较清晰地分析、判断古地震事件以及采集测年样品,所以我们在沙坝1组、和尚坪和邓家海光6组等3个地点开挖了4个探槽,并进行了断错地貌的实测,发现了该地区明显的古地震遗迹,以及该地区特殊的正断层地表破裂样式.通过探槽和实测地貌情况与前人在龙门山中央和前山断裂带的古地震研究结果的对比分析,结果显示该地区至少发生过两次地震事件(包括5.12地震事件在内),与龙门山中央和前山断裂大部分地点已揭露的古地震事件相吻合.而通过对该地区地貌侵蚀特征与地震陡坎的高度变化分析,可以得出该地区之前的地震事件与5.12地震的大小相近.
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