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| 1 | Pore Size Distribution of a Tight Sandstone Reservoir and its Effect on Micro Pore-throat Structure: A Case Study of the Chang 7 Member of the Xin’anbian Block, Ordos Basin, China显示文摘Pore distribution and micro pore-throat structure characteristics are significant for tight oil reservoir evaluation, but their relationship remains unclear. This paper selects the tight sandstone reservoir of the Chang 7 member of the Xin’anbian Block in the Ordos Basin as the research object and analyzes the pore size distribution and micro pore-throat structure using field emission scanning electron microscopy(FE-SEM), high-pressure mercury injection(HPMI), highpressure mercury injection, and nuclear magnetic resonance(NMR) analyses. The study finds that:(1) Based on the pore size distribution, the tight sandstone reservoir is characterized by three main patterns with different peak amplitudes. The former peak corresponds to the nanopore scale, and the latter peak corresponds to the micropore scale. Then, the tight sandstone reservoir is categorized into three types: type 1 reservoir contains more nanopores with a nanopore-to-micropore volume ratio of 82:18;type 2 reservoir has a nanopore-to-micropore volume ratio of 47:53;and type 3 reservoir contains more micropores with a nanopore-to-micropore volume ratio of 35:65.(2) Affected by the pore size distribution, the throat radius distributions of different reservoir types are notably offset. The type 1 reservoir throat radius distribution curve is weakly unimodal, with a relatively dispersed distribution and peak ranging from 0.01 μm to 0.025 μm. The type 2 reservoir’s throat radius distribution curve is single-peaked with a wide distribution range and peak from 0.1 μm to 0.25 μm. The type 3 reservoir’s throat radius distribution curve is single-peaked with a relatively narrow distribution and peak from 0.1 μm to 0.25 μm. With increasing micropore volume, pore-throat structure characteristics gradually improve.(3) The correlation between micropore permeability and porosity exceeds that of nanopores, indicating that the development of micropores notably influences the seepage capacity. In the type 1 reservoir, only the mean radius and effective porosity have suitable correlations with the nanopore and micropore porosities. The pore-throat structure parameters of the type 2 and 3 reservoirs have reasonable correlations with the nanopore and micropore porosities, indicating that the development of these types of reservoirs is affected by the pore size distribution. This study is of great significance for evaluating lacustrine tight sandstone reservoirs in China. The research results can provide guidance for evaluating tight sandstone reservoirs in other regions based on pore size distribution. | LI Peng JIA Chengzao JIN Zhijun LIU Quanyou BI HeZHENG Min WU Songtao HUANG Zhenkai | 2020 | Acta Geologica Sinica(English Edition)2020，94，2： | 5 |
| 2 | Study on Evaluation Models of Highway Safety Based on Catastrophe Theory显示文摘 | Bi Hezheng Lu Linjun Lu Jian | 2014 | Mathematical Problems in Engineering2014，2014，910： | 1 |
| 3 | Negative pressure closes the drainage technology application in enormous fresh lower limbs surface of a wound显示文摘 | LIU HEZHENG YU GUORONG ZHOU MEIJUN | 2001 | Clinical surgery magazine2001，9，4： | 1 |
| 4 | Synthesis of ZrN-Si_3N_4 Composite by Carbothermal Reduction and Nitridation of Zircon显示文摘Zircon(≤44 μm)and carbon black(≤30 μm)were used as starting materials and mixed for 24 h using anhydrous ethanol as medium with the mass ratio of 100:40,dried fully at 60 ℃ and then dry mixed for 10 h.Specimens with size of 20 mm×5 mm were pressed under 60 MPa,then dried fully at 120 ℃,put into a furnace with 1.0 L·min-1 nitrogen gas and fired at 1 400,1 450,1 480 and 1 500 ℃ for 6,9 and 12 h,respectively.The phase composition and microstructure of the specimens were studied by XRD and SEM,and the carbothermal reduction and nitridation reaction process was thermodynamically analyzed.The results show that using zircon and carbon black as starting materials,ZrN-Si3N4 composite is synthesized by carbothermal reduction and nitridation reaction in nitrogen atmosphere.The composites with different compositions are obtained by controlling the firing temperature and partial pressure of CO gas.The proper firing temperature and holding time to synthesize ZrN-Si3N4 composite are 1 500 ℃ for 12 h. | MA Beiyue YU Jingkun LI Hezheng WANG Zhenming | 2010 | China's Refractories2010，19，1： | 0 |
| 5 | Self-synthesized second mitochondria-derived activator of caspase(SMAC)mimetic TP-WY-1345 enhances the radiosensitivity of NSCLC cells H1299 by targeting anti-apoptotic protein cIAP1显示文摘Objective:To explore the toxicity and cellular uptake of the self-synthesized second mitochondria-derived activator of caspase(SMAC)mimetic TP-WY-1345 polypeptide and its radiosensitizing effect on non-small cell lung cancer(NSCLC).Methods:A fluorescence microscope was used to observe the uptake efficiency of TP-WY-1345 by human NSCLC cells H1299.Toxicity of the TP-WY-1345 peptide in normal cells was examined in human embryonic lung fibroblasts MRC5.CCK-8 and clone formation experiments were performed to detect the radiosensitizing effect of TP-WY-1345 in the H1299 cells.The AutoDock Vina simulation software was employed to predict the binding efficiency of TP-WY-1345 to the inhibitor of apoptosis proteins(IAPs).Moreover,Western blot and qPCR experiments were carried out to determine the protein and gene expressions,and the flow cytometry(FCM)technique was used to detect the apoptosis level under different conditions.Results:TP-WY-1345 can be self-synthesized,and significant green fluorescence was observed in H12992 h and 6 h after incubation with TP-WY-1345.The cell counting and CCK-8 results showed that 10μmol/L and 20μmol/L TP-WY-1345 did not produce a significant toxic effect on the MRC5 cells(P>0.05).Compared with the single ionizing radiation group,the cell viability and clone formation of H1299 cells were significantly inhibited after treatment with TP-WY-1345 at a concentration of 50μmol/L(P<0.05).The sensitivity enhancement ratio(SER)was calculated to be 1.14.Moreover,the binding efficiency of TP-WY-1345 to cIAP1 protein was predicted to be7.3,and this strong binding force was demonstrated by Western blot.TP-WY-1345 inhibited the protein and mRNA expressions of cIAP1 and further increased the apoptosis level of the H1299 cells at 24 h(P<0.01)and 48 h after radiation(P<0.05).Conclusion:SMAC mimetic TP-WY-1345 can enter the H1299 cells and produce a radiosensitizing effect by increasing the level of radiation-induced apoptosis of the cells.There,TP-WY-1345 is expected to become a new generation of radiosensitizing drugs. | Hao Sun Fengting Liu Hezheng Zhai Jiang Wu Shasha Nie Hui Cai Kaixue Wen Li Feng Qiang Liu Kaihua Ji Yan Wang | 2023 | Radiation Medicine and Protection2023，4，1： | 0 |
| 6 | Model and Implementation of Communication Link Management Supporting High Availability显示文摘Despite the rapid evolution in all aspects of computer technology, both the computer hardware and software are prone to numerous failure conditions. In this paper, we analyzed the characteristic of a computer system and the methods of constructing a system , proposed a communication link management model supporting high availability for network applications, Which will greatly increase the high availability of network applications. Then we elaborated on heartbeat or service detect, fail-over, service take-over, switchback and error recovery process of the model. In the process of constructing the communication link, we implemented the link management and service take-over with high availability requirement, and discussed the state and the state transition of building the communication link between the hosts, depicted the message transfer and the start of timer. At Last, we applied the designed high availability system to a network billing system, and showed how the system was constructed and implemented, which perfectly satisfied the system requirements. | LuoJuan CaoYang HeZheng LiFeng | 2004 | Wuhan University Journal of Natural Sciences2004，9，1： | 0 |
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