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| 1 | Microstructure Evolution of Organic Matter and Clay Minerals in Shales with Increasing Thermal Maturity显示文摘As the two important components of shale, organic matter(OM) and clay minerals are usually thought to strongly influence the hydrocarbon generation, enrichment and exploitation. The evolution process of OM and clay minerals as well as their interrelationship over a wide range of thermal maturities are not completely clear. Taking Yanchang(T3y), Longmaxi(S1l) and Niutitang(?1n) shales as examples, we have studied the microstructure characteristics of OM and clay minerals in shales with different thermal maturities. The effects of clay minerals and OM on pores were reinforced through sedimentation experiments. Using a combination of field emission scanning electron microscopy(FESEM) and low-pressure N2 adsorption, we investigated the microstructure differences among the three shales. The results showed that both OM and clay minerals have strong effects on pores, and small mesopore(2–20 nm) is the dominant pore component for all three samples. However, the differences between the three samples are embodied in the distribution of pore size and the location. For the T3y shale, clay minerals are loosely arranged and develop large amounts of pores, and fine OM grains often fill in intergranular minerals or fractures. Widespread OM pores distribute irregularly in S1l shale, and most of the pores are elliptical and nondirectional. The ?1n shale is characterized by the preferred orientational OM-clay aggregates, and lots of pores in the composites are in the mesopore range, suggesting that over maturity lead to the collapse and compaction of pores under huge pressure of strata. The results of the current research imply that with increasing thermal maturity, OM pores are absent at low maturity(T3y), are maximized at high maturity(S1l) and are destroyed or compacted at over-mature stage(?1n). Meanwhile, clay minerals have gone through mineral transformation and orientational evolution. The interaction of the two processes makes a significant difference to the microstructure evolution of OM and clay minerals in shale, and the findings provide scientific foundation in better understanding diagenetic evolution and hydrocarbon generation of shale. | GU Yuantao LI Xiaoxia YANG Shuguang WAN Quan | 2020 | Acta Geologica Sinica(English Edition)2020，94，2： | 3 |
| 2 | The effects of clay minerals and organic matter on nanoscale pores in Lower Paleozoic shale gas reservoirs, Guizhou, China显示文摘In organic-rich gas shales, clay minerals and organic matter(OM) have significant influences on the origin, preservation, and production of shale gas. Because of the substantial role of nanoscale pores in the generation,storage, and seepage of shale gas, we examined the effects of clay minerals and OM on nanoscale pore distribution characteristics in Lower Paleozoic shale gas reservoirs.Using the Niutitang and Longmaxi shales as examples, we determined the effects of clay minerals and OM on pores through sedimentation experiments. Field emission–scanning electron microscopy combined with low-pressure N2 adsorption of the samples before and after sedimentation showed significant differences in pore location and pore size distribution between the Niutitang and Longmaxi shales. Nanoscale pores mostly existed in OM in the Longmaxi shale and in clay minerals or OM–clay composites in the Niutitang shale. The distribution differences were attributed largely to variability in thermal evolution and tectonic development and might account for the difference in gas-bearing capacity between the Niutitang and Longmaxi reservoirs. In the nanoscale range, mesopores accounted for 61–76% of total nanoscale pore volume.Considerably developed nanoscale pores in OM were distributed in a broad size range in the Longmaxi shale, which led to good pore connectivity and gas production.Numerous narrow pores(i.e., pores \ 20 nm) in OM–clay composites were found in the Niutitang shale, and might account for this shale's poor pore connectivity and low gas production efficiency. Enhancing the connectivity of the mesopores(especially pores \ 20 nm and those developed in OM–clay composites) might be the key to improving development of the Niutitang shale. The findings provide new insight into the formation and evolutionary mechanism of nanoscale pores developed in OM and clay minerals. | Yuantao Gu Quan Wan Wenbin Yu Xiaoxia Li Zhongbin Yu | 2018 | Acta Geochimica2018，37，6： | 2 |
| 3 | A review on COVID-19 transmission,epidemiological features,prevention and vaccination显示文摘Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has caused hundreds of millions of infections and millions of deaths over past two years.Currently,many countries have still not been able to take the pandemic under control.In this review,we systematically summarized what we have done to mitigate the COVID-19 pandemic,from the perspectives of virus transmission,public health control measures,to the development and vaccination of COVID-19 vaccines.As a virus most likely coming from bats,the SARS-CoV-2 may transmit among people via airborne,faecal-oral,vertical or foodborne routes.Ourmeta-analysis suggested that the R0 of COVID-19 was 2.9(95%CI:2.7–3.1),and the estimates in Africa and Europe could be higher.The median Rt could decrease by 23–96%following the nonpharmacological interventions,including lockdown,isolation,social distance,and face mask,etc.Comprehensive intervention and lockdown were the most effective measures to control the pandemic.According to the pooled R0 in our meta-analysis,there should be at least 93.3%(95%CI:89.9–96.2%)people being vaccinated around the world.Limited amount of vaccines and the inequity issues in vaccine allocation call for more international cooperation to achieve the antiepidemic goals and vaccination fairness. | Yuqin Zhang Gonghua Wu Shirui Chen Xu Ju Wumitijiang Yimaer Wangjian Zhang Shao Lin Yuantao Hao Jing Gu Jinghua Li | 2022 | Medical Review2022，2，1： | 2 |
| 4 | 1_0 norm con-straint LMS algorithm for sparse system identification 显示文摘 | Yuantao Gu Jian Jin Shunliang Mei | 2009 | IEEE Signal Processing Letters2009，16，9： | 1 |
| 5 | A Stochastic Gradient Approach on Compressive Sensing Signal Reconstruction Based on Adaptive Filtering Framework显示文摘 | Jian Jin Yuantao Gu Shunliang Mei | | 0，，02： | 1 |
| 6 | Incorporating Network Coding into TCP Grounded on Network Utility Maximization in Multi-Radio Multi-Channel Wireless Mesh Networks显示文摘A new approach, named TCP-I2NC, is proposed to improve the interaction between network coding and TCP and to maximize the network utility in interference-free multi-radio multi-channel wireless mesh networks. It is grounded on a Network Utility Maxmization (NUM) formulation which can be decomposed into a rate control problem and a packet scheduling problem. The solutions to these two problems perform resource allocation among different flows. Simulations demonstrate that TCP-I2NC results in a significant throughput gain and a small delay jitter. Network resource is fairly allocated via the solution to the NUM problem and the whole system also runs stably. Moreover, TCP-I2NC is compatible with traditional TCP variants. | Liu Hongquan Gu Yuantao | 2012 | China Communications2012，9，6： | 1 |
| 7 | A stochastic gradient approach on compressive sensing signal reconstruction based on a- daptive filtering framework 显示文摘 | Jin Jian Gu Yuantao Mei Shunliang | 2010 | IEEE Journal of Signal Processing2010，4，2： | 1 |
| 8 | Com- bined power control and link selection in device-to-device enabled cellular systems 显示文摘 | CHENG Yongsheng GU Yuantao LIN Xiaokang | 2013 | IET Communications2013，7，12： | 1 |
| 9 | l0 norm constraint LMS algorithm for sparse system identification 显示文摘 | Gu Yuantao Jin Jian and Mei Shunliang | 2009 | IEEE Signal Processing Letters2009，16，9： | 1 |
| 10 | Performance analysis of l0 norm constraint least mean square algorithm 显示文摘 | Su Guolong Jin Jian Gu Yuantao | 2012 | IEEE Transactions on Signal Processing2012，60，5： | 1 |
| 11 | Robust zero-point attraction least mean square algorithm on near sparse system identification 显示文摘 | Jin Jian Qu Qing Gu Yuantao | 2013 | IET Signal Processing2013，7，3： | 1 |
| 12 | Performance Enhancement and Utility Maximization for TCP in Wireless Mesh Networks显示文摘In Wireless Mesh Networks (WMNs),the performance of conventional TCP significantly deteriorates due to the unreliable wireless channel.To enhance TCP performance in WMNs,TCP/LT is proposed in this paper.It introduces fountain codes into packet reorganization in the protocol stack of mesh gateways and mesh clients.Furthermore,it is compatible with conventional TCP.Regarded as a Performance Enhancement Proxies (PEP),a mesh gateway buffers TCP packets into several blocks.It simultaneously processes them by using fountain encoders and then sends them to mesh clients.Apart from the improvement of the throughput of a unitary TCP flow,the entire network utility maximization can also be ensured by adjusting the scale of coding blocks for each TCP flow adaptively.Simulations show that TCP/LT presents high throughput gains over single TCP in lossy links of WMNs while preserving the fairness for multiple TCPs.As losses increase,the transmission delay of TCP/LT experiences a slow linear growth in contrast to the exponential growth of TCP. | Liu Hongquan Chen Jiong Song Siming Gu Yuantao | 2012 | China Communications2012，9，4： | 0 |
| 13 | Structure and Evolution of Clay-Organic Nanocomposites in Three Leading Shales in China显示文摘Organic matter(OM)in shales occurs as nanometer-sized intercalations with clay minerals that are termed as clay-organic nanocomposites;however,the OM occurrence in nanocomposites at different stages of maturation is still unclear,and the co-evolution process of OM and clay under burial is not well understood.To reveal the variation of OM occurrence and clarify the relationship between petroleum generation of OM&transformation of clay minerals in nanocomposites as a function of maturity,this study investigates the structure and clay-OM association in 44 samples from three leading shales at different maturity stages from two basins in China.A total of 15 samples of lacustrine shale from upper Triassic Yanchang Formation,15 samples of marine shale from Lower Silurian Longmaxi Formation,and 14 samples of marine shale from Lower Cambrian Niutitang Formation were analyzed based on organic geochemistry,X-ray diffraction(XRD),and field emission-scan electron microscopy(FE-SEM),focused ion beam(FIB)sample preparation and consequent high resolution-transmission electron microscopy(HR-TEM)observations combined with energy dispersive spectroscopy(EDS).The results from this study show that most shale samples are organic-rich,and these three shales represent thermal evolutionary process from oil-window mature to overmature in a sequence of Triassic Yanchang,Silurian Longmaxi,and Cambrian Niutitang formations.Thorough observations indicate that sub-parallel bands of clays and intermingling of detrital minerals(such as quartz)dominate the nanocomposites in the Yanchang samples.While for Longmaxi and Niutitang shales,abundant nanopores and pyrite nanoparticles are observed in nanocomposites with features of layered distributions of OM and clay minerals.The structural investigation of nanocomposites shows that organic carbon between multi-layers dominates the OM occurrence in nanocomposites,which significantly extends the traditional opinion of OM-clay association.At an oil-window mature stage,the fluctuational interlayer spacing and a certain intensity of the carbon peak observed in the EDS spectra for corresponding clays provide a visual evidence of the organic molecules accessing the monolayer spaces of smectite.With the evolutional process of nanocomposites in shale and petroleum generation of OM&mineral transformation(illitization of smectite)running in parallel,it is inferred that the organic molecules migrate from monolayer spaces as gaseous hydrocarbons are generated,and eventually form stable clay-organic nanocomposites at an overmature stage.The results presented here will contribute to an improved understanding of diagenesis and organic-inorganic interactions in OM-rich shales. | Yuantao Gu Quan Wan Xiaoxia Li Tao Han Shuguang Yang Qinhong Hu | 2023 | Journal of Earth Science2023，34，3： | 0 |
| 14 | Sevoflurane and nitric oxide synthase expression in rat cochlea显示文摘Sevoflurane exhibits anesthetic action by inhibiting the auditory cortex,brain stem nitric oxide synthase activity,and reducing nitric oxide(NO),thereby interfering with the hearing process.However,the influence of sevoflurane on peripheric receptor(cochlea) NO remains poorly understood.Results from the present study showed that sevoflurane downregulated cochlear inducible NO synthase,endothelial NO synthase and neuronal NO synthase expression in a dose dependent manner.This suggests that sevoflurane can decrease cochlear NO synthase expression in a dose dependent manner. | Yuantao Li Qingzhong Hou Mingguang Wu Xiaolei Huang Jun Cao Yin Gu Xiaofei Qi Yawen Li | 2010 | Neural Regeneration Research2010，5，19： | 0 |
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