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Search Results: 1 - 10 of 50967 matches for " Guoqi Wei "
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Structural characteristics and petroliferous features of Tarim Basin
Chengzao Jia,Guoqi Wei
Chinese Science Bulletin , 2002, DOI: 10.1007/BF02902812
Abstract: Using the modern tectonic geology theories and methods such as the plate tectonic analysis, the paleo-structure analysis, the structural-lithofacies analysis, and the fault related fold and petroleum system, and combining with the seismic data, well drilling data and the circumferential field geology, study on the structural characteristics and petroleum prospect in the Tarim Basin has been carried out. Results show that the Tarim Basin is a large superimposition and combination basin with continental crustal basement, composed of a Paleozoic craton and Meso-Cenozoic foreland basins. The characteristics of the basin are: the kernel part of the basin is the marine facies Paleozoic craton, superimposed 4 continental facies foreland basins. Though the scale of the paleozoic craton of the Tarim Basin is relatively small, the structure is steady. The petroleum prospect of the Paleozoic craton is: multiphase pool-generation and accumulation controlled by ancient uplift. The Meso-Cenozoic foreland basins in the Tarim Basin, which are distributed on the cratonic circumference and are a long-term subsidence, turned into rejuvenated foreland basins after the Meso-Cenozoic period. The petroleum prospects are: coal-bed generating hydrocarbon, abundant natural gas, pool-generation in later and recent periods, the oil and gas distribution controlled by the foreland thrust belt. The structural characteristics of Tarim provide it with a superimposition and combination petroleum system of multiple resources, multiple reservoirs and multiphase pool-generation. The oil and gas exploration prospect covers two large fields: the Paleozoic craton and the Meso-Cenozoic foreland thrust belt.
Modeling Neuromorphic Persistent Firing Networks  [PDF]
Ning Ning, Guoqi Li, Wei He, Kejie Huang, Li Pan, Kiruthika Ramanathan, Rong Zhao, Luping Shi
International Journal of Intelligence Science (IJIS) , 2015, DOI: 10.4236/ijis.2015.52009
Abstract: Neurons are believed to be the brain computational engines of the brain. A recent discovery in neurophysiology reveals that interneurons can slowly integrate spiking, share the output across a coupled network of axons and respond with persistent firing even in the absence of input to the soma or dendrites, which has not been understood and could be very important for exploring the mechanism of human cognition. The conventional models are incapable of simulating the important newly-discovered phenomenon of persistent firing induced by axonal slow integration. In this paper, we propose a computationally efficient model of neurons through modeling the axon as a slow leaky integrator, which captures almost all-known neural behaviors. The model controls the switching of axonal firing dynamics between passive conduction mode and persistent firing mode. The interplay between the axonal integrated potential and its multiple thresholds in axon precisely determines the persistent firing dynamics of neurons. We also present a persistent firing polychronous spiking network which exhibits asynchronous dynamics indicating that this computationally efficient model is not only bio-plausible, but also suitable for large scale spiking network simulations. The implications of this network and the analog circuit design for exploring the relationship between working memory and persistent firing enable developing a spiking network-based memory and bio-inspired computer systems.
Silurian to Devonian foreland basin in the south edge of Tarim Basin
Guoqi Wei,Chengzao Jia,Benliang Li,Hanlin Chen
Chinese Science Bulletin , 2002, DOI: 10.1007/BF02902817
Abstract: Based on the theory of plate tectonics, combining with the isotopic dating of ophiolite, igneous and volcanics, geochemical test, rare earth element analyze and seismic interpretation, this paper studies the pre-Carboniferous tectonics and sedimentary formation of the south edge of the Tarim Basin and proves that there exists the Kunlun Ocean under tensional tectonics during the Sinian and Cambrian in the south edge of the Tarim Plate. After that, due to the collision orogenesis, there formed the peripheral foreland basin in the south edge of Tarim. The Upper Silurian and Devonian molasses sedimentary system superposed on the Sinian and Middle Silurian passive margin flysch sedimentary system and formed the bivariate structure of the foreland basin. And at the same time, based on the field geology and seismic interpretation, we have identified that the formation of the Silurian and Devonian have the character of half deposit which shows thick in the south area and thin in the north, and the pre-Carboniferous thrust compression tectonics remained in the foreland thrust belt, which further demonstrates that there existed the Silurian and Devonian peripheral foreland basin on the south edge of the Tarim Basin.
Tectonic evolution of Tethyan tectonic field, formation of Northern Margin basin and explorative perspective of natural gas in Tarim Basin
Shufeng Yang,Chengzao Jia,Hanlin Chen,Guoqi Wei,Xiaogan Cheng,Dong Jia,Ancheng Xiao,Shaojie Guo
Chinese Science Bulletin , 2002, DOI: 10.1007/BF02902816
Abstract: Analyzing the characteristics of the Tethyan tectonic field, the authors think that the Tethyan tectonic field underwent three evolutional stages: closing of Paleo-Tethys and rifting of Neo-Tethys from early Permian to late Triassic, subduction of Neo-Tethys and collision between the Indian plate and the Eurasia plate from Jurassic to early of low Tertiary, and collision between the Arab plate and the Eurasia plate and the A-type subduction of Indian plate from late of low Tertiary to the present. Combining the evolution of the Tethyan orogenic belt with the characteristics of the Northern Margin basin, it is suggested that the sedimentary and tectonic characteristics and types of the Northern Margin basin are controlled by the formation and evolution of the Tethyan orogenic belt and the ingression of Tethys. The evolution of Northern Margin basin can be divided into three development stages: back-arc foreland basin from late Permian to Triassic, the back-arc fault subsidence and depression from Jurassic to the early of low Tertiary, and the reactive foreland basin from the late of low Tertiary to the present. The Northern Margin basin in the Tethyan tectonic field is an important region for natural gas accumulation, and the Tarim Basin is a part of this region.
Geological thermal events in Tarim Basin
Hanlin Chen,Shufeng Yang,Chuanwan Dong,Guoqiang Zhu,Chengzao Jia,Guoqi Wei,Zhengguo Wang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03182623
Abstract:
Methods for diagenetic facies research on carbonate rocks and its application: Example from oolitic beach reservoir of the Feixianguan Formation in the northern margin of Yangtze block.
碳酸盐岩成岩相研究方法及其应用——以扬子地块北缘飞仙关组鲕滩储层为例

YANG Wei,WEI GuoQi,JIN Hui,SHEN JueHong,
杨威
,魏国齐,金惠,沈珏红

岩石学报 , 2011,
Abstract: Diagenetic facies is an important approach to study diagenesis distributing. It is integrative representation of all kinds of diageneses occurring in definite diagenetic environment. Based on the detailed study of diagenesis and diagenetic environment, eight types of diagenetic facies and seven types of diagenetic subfacies are divided in Feixianguan Formation, northern margin of the Yangtze block. All kinds of identification labels are summarized. The authors discussed the relationship between diagenetic facies and sedimentary facies, log facies, seismic facies, as well as the diagenetic distributing characteristic on spot, line and plane. Favorable exploration targets and belts were predicted. The effective research approach of diagenetic facies summarized by this paper is worth popularizing in oil and gas exploration.
Stratigraphic sequence and sedimentary facies distribution of the Permian-Middle Triassic in the northwestern margin of the Yangtze block.
扬子地块西北缘二叠系-中三叠统层序地层与沉积相展布

WEI GuoQi,YANG Wei,WAN YiPing,JIN Hui,
魏国齐
,杨威,万怡平,金惠

岩石学报 , 2011,
Abstract: The Permian-Middle Triassic is mainly composed of carbonate rocks in the northwestern margin of the Yangtze block. In this paper, based on the application of theories and methods of carbonate sequence stratigraphy and the analysis of seismic data, outcrop, drill core and log information, we identify in the Permian-Middle Triassic strata four depositional sequence surfaces, i.e., erosional unconformity, transgression onlap sequence unconformity, subaqueous depositional break sequence unconformity and local e...
Instability of (CTG)n?(CAG)n trinucleotide repeats and DNA synthesis
Guoqi Liu, Michael Leffak
Cell & Bioscience , 2012, DOI: 10.1186/2045-3701-2-7
Abstract: Expansion of (CTG)n?(CAG)n trinucleotide repeat (TNR) sequences at distinct chromosomal loci is the mutation common to multiple neurological diseases including myotonic dystrophy type 1 (DM1), Huntington disease (HD), Huntington disease-like 2 (HDL2), dentatorubral-pallidoluysian atrophy (DRPLA), spinal and bulbar muscular atrophy (SBMA), and several forms of spinocerebellar ataxia (SCA). The polyglutamine diseases HD, DRPLA, SBMA, and SCA1, 3, 6, 7, 17 result from increases of (CAG)n repeats in the coding (nontemplate) strand for mRNA synthesis of the cognate genes ((CAG)n in RNA) to produce mutant polyglutamine proteins with toxic gain-of-function [1]. In contrast, (CTG)n?(CAG)n expansion at the DMPK 3' UTR alters the chromatin structure of the region, downregulates transcription of the locus and, as at the JPH3 gene produce poly-(CUG) pre-mRNAs respectively in DM1 and HDL2 patients that sequester the MBNL (CUG) binding proteins, leading to trans-dominant interference with the normal splicing of multiple RNAs. Finally, bidirectional transcription at the SCA8 locus can result in expression of both a polyglutamine protein and a (CUG)n expansion transcript, which may represent a toxic gain-of-function at both the protein and RNA levels.Trinucleotide repeat expansion requires DNA synthesis, either during DNA replication or repair. The effects of replication origin proximity, replication polarity, and replication inhibition support replication-based models of TNR instability in mitotic cells [2-9]. Hairpin formation by DNA polymerase slippage is a likely mechanism for changes in TNR repeat length [10-12]. Hairpin structure formation by DNA polymerase slippage at (CTG)n?(CAG)n sequences has been well documented in vitro [13,14] and can result in either insertion or deletion mutations. However, hairpins have also been postulated to arise during replication fork reversal and postreplication repair [2,15,16], Okazaki fragment maturation [17-19], base excision repair [20],
An image smoothing method of two-dimensional wavelet interpolation
图像平滑的2维小波插值方法

guoqi,
郭琦

中国图象图形学报 , 2010,
Abstract: In image smoothing with diffusion equation, general methods are to construct difference equation of diffusion, then solve it with initialization and edge condition. These methods have low precision and diffuse error quickly. So a wavelet interpolation method is structured in this paper and is applied to solve the diffusion equation. We get a method to Alvarez model by two-dimensional wavelet interpolation method. Wavelet function possess better partial character, compared with finite difference method, wavelet method has higher precision, slower speed of error diffusion, and not is sensitive to time interval. The experiment shows the advantages of this method compared with difference method.
Parsimonious and Efficient Likelihood Composition by Gibbs Sampling
Davide Ferrari,Guoqi Qian
Statistics , 2015,
Abstract: The traditional maximum likelihood estimator (MLE) is often of limited use in complex high-dimensional data due to the intractability of the underlying likelihood function. Maximum composite likelihood estimation (McLE) avoids full likelihood specification by combining a number of partial likelihood objects depending on small data subsets, thus enabling inference for complex data. A fundamental difficulty in making the McLE approach practicable is the selection from numerous candidate likelihood objects for constructing the composite likelihood function. In this paper, we propose a flexible Gibbs sampling scheme for optimal selection of sub-likelihood components. The sampled composite likelihood functions are shown to converge to the one maximally informative on the unknown parameters in equilibrium, since sub-likelihood objects are chosen with probability depending on the variance of the corresponding McLE. A penalized version of our method generates sparse likelihoods with a relatively small number of components when the data complexity is intense. Our algorithms are illustrated through numerical examples on simulated data as well as real genotype SNP data from a case-control study.
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