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| 1 | Study on kinetics of hydrocarbon generation from coals in the Qinshui Basin显示文摘A new method for the quantitative assessment of hydrocarbon generation potential from coals by means of the chemical reaction kinetics has been developed gradually over the recent years. In this paper, the kinetic parameters of hydrocarbon gas generation are determined by high tem-perature and pressure, and closed- system thermal simula-tion for Late Paleozoic coals in the Qinshui Basin and the kinetic characteristics and the histories of hydrocarbon gas generation were studied using the parameters obtained. Re-sults show that during the longer period from the Triassic (T) to the Middle Jurassic (J2), the coal-derived methane yield increased more slowly under lower palaeogeotemperature in the Qinshui Basin; however, the shorter period from Late Jurassic to Early Cretaceous, the coal-derived methane yield increased more rapidly under higher palaeogeotemperature. The correlation between the thermal simulation and the fac-tual data shows that C1/ (C1+C2―4) coefficients computed by the histories of methane and C2―C4 hydrocarbon generation can provide evidence for the identification of the genesis of coal bed gas in the different areas of the Qinshui Basin. The kinetic simulating experiment of hydrocarbon generation for the peat considered as the original matter of coal formation was performed for the first time and the simulated results were compared with the characteristics of hydrocarbon gen-eration from coals undergoing various palaeogeotemperature in the Qinshui Basin. The result indicates that the peat has a higher potential of hydrocarbon generation than that of coals. Therefore, the hydrocarbon generation results obtained from kinetic simulation for coal with higher maturation rank could not stand for their original hydrocarbon generation potential and thus would lead to an underestimation for coal-bed gas resource. The generative amount of coal-derived gas in the Qinshui Basin was predicted using kinetic simula-tion results for the peat and their maximum was estimated. The calculation shows that the generative amount of coal-derived gas from Taiyuan Formation and Shanxi For-mation coal-beds in the Qinshui Basin is the highest in Yangcheng area, higher in Qinyuan area and the lowest in Huoshan area. Therefore, the conditions of coal-bed gas gen-eration are the best in Yangcheng area, the second in Qinyuan area and not very good in Huoshan area. | DUAN Yi WU Baoxiang ZHENG Chaoyang WANG Chuanyuan ZHANG Hui TAO Mingxin LIU Jinzhong ZHANG Xiaojun | 2005 | Chinese Science Bulletin2005，50，17： | 3 |
| 2 | Heavy ion and X-ray irradiation alter the cytoskeleton and cytomechanics of cortical neurons显示文摘Heavy ion beams with high linear energy transfer exhibit more beneficial physical and biological performance than conventional X-rays, thus improving the potential of this type of radiotherapy in the treatment of cancer. However, these two radiotherapy modalities both cause inevitable brain injury. The objective of this study was to evaluate the effects of heavy ion and X-ray irradiation on the cytoskeleton and cytomechanical properties of rat cortical neurons, as well as to determine the potential mechanism of neuronal injury after irradiation. Cortical neurons from 30 new-born mice were irradiated with heavy ion beams at a single dose of 2 Gy and X-rays at a single dose of 4 Gy; subsequent evaluation of their effects were carried out at 24 hours after irradiation. An immunofluorescence assay showed that after irradiation with both the heavy ion beam and X-rays, the number of primary neurons was significantly decreased, and there was evidence of apoptosis. Radiation-induced neuronal injury was more apparent after X-irradiation. Under atomic force microscopy, the neuronal membrane appeared rough and neuronal rigidity had increased. These cell changes were more apparent following exposure to X-rays. Our findings indicated that damage caused by heavy ion and X-ray irradiation resulted in the structural distortion and rearrangement of the cytoskeleton, and affected the cytomechanical properties of the cortical neurons. Moreover, this radiation injury to normal neurons was much severer after irradiation with X-rays than after heavy ion beam irradiation. | Yuting Du Jie Zhang Qian Zheng Mingxin Li Yang Liu Baoping Zhang Bin Liu Hong Zhang Guoying Miao | 2014 | Neural Regeneration Research2014，9，11： | 3 |
| 3 | Experimental Study on Oxy-Fuel Combustion and NO Emission in a Spouted-Fluidized Bed with under Bed Feeding显示文摘The spouted-fluidized bed is modified from the classical fluidized bed device,which combines the features of spouted and fluidized beds.In the present work,the performance of oxy-fuel spouted-fluidized bed combustion with under bed feeding and its effect on NO emission were systematically investigated.The results revealed that it was feasible to use a spouted-fluidized bed combustor for oxy-fuel combustion with real flue gas recycling.The transition from air combustion to oxy-fuel combustion was smooth and the concentration of CO_(2) in the flue gas could be as high as 90%steadily(dry base).Increasing the reaction temperature exhibited a negative effect on NO emission.Compared with that under the shallow bed,the concentration of NO in the flue gas was lower under the deep bed condition.Besides,the utilization of crush particles was favorable for suppressing NO emission because of the promoted mixing between coal particles and solid bed materials.Furthermore,the addition of limestone was proven to undesirably increase the NO emission during oxy-fuel spouted-fluidized bed combustion. | XU Mingxin WU Yachang WU Haibo OUYANG Haodong ZHENG Shu LU Qiang | 2021 | Journal of Thermal Science2021，30，4： | 2 |
| 4 | Multiple amino acid substitutions are involved in the adaptation of H9N2 avian influenza virus to mice显示文摘 | Rui Wu Hongbo Zhang Keli Yang Wangwang Liang Zhongliang Xiong Zewen Liu Xuehai Yang Huabin Shao Xinmin Zheng Mingxin Chen Diping Xu | 2009 | Veterinary Microbiology2009，，1： | 1 |
| 5 | Sorption properties of greenwaste biochar for two triazine pesticides 显示文摘 | Zheng Wei Guo Mingxin Chowa T | 2010 | Journal of Hazardous Materials2010，18，： | 1 |
| 6 | Sorption properties of greenwaste biochar for two triazine pesticides 显示文摘 | Zheng Wei Guo Mingxin Chow Teresa | 2010 | Journal of Hazardous Materials2010，181，13： | 1 |
| 7 | Sorption properties of green waste biochar for two triazine pesticides 显示文摘 | Zheng Wei Guo Mingxin Chow Teresa | 2010 | Journal of Hazardous Materials2010，181，13： | 1 |
| 8 | Sorption properties of greenwaste biochar for two triazine pesticides 显示文摘 | Zheng Wei Guo Mingxin Chow Teresa | 2010 | J Hazard Mater2010，181，： | 1 |
| 9 | Sorption properties of greenwaste biochar for two tri- azine pesticides 显示文摘 | WEI ZHENG MINGXIN GUO TERESA CHOWA et a/ | 2010 | Journal of Hazardous Materials2010，181，13： | 1 |
| 10 | Sorption properties of greenwaste biochar for two triazine pesticides 显示文摘 | Wei Zheng Mingxin Guo Teresa Chowa | 2010 | Journal of Hazardous Materials2010，181，181： | 1 |
| 11 | Spread of double-walled carbon nanotube membrane显示文摘A single-layer double-walled carbon nanotube (DWNT) membrane, with 100 cm2 in area, 50 nm in thickness, was spread by adding a few drops of ethanol (or acetone) on the purified DWNTs. Compared with acetone, ethanol is more efficient in spreading DWNT films. The spreading rate of DWNT mem-brane increases with the ethanol concentration, and it also first increases with temperature (below 60℃), then decreases as the temperature rises to above 60℃. | JIA Yi WEI JinQuan SHU QinKe CHANG JianGuo WANG KunLin WANG ZhiCheng LUO JianBin LIU WenJin ZHENG MingXin WU DeHait | 2007 | Chinese Science Bulletin2007，52，7： | 1 |
| 12 | Sorption properties of greenwaste biochar for two triazine pesticides显示文摘 | Wei Zheng Mingxin Guo Teresa Chowa | 2010 | Journal of Hazardous Materials2010，181，181： | 1 |
| 13 | The Application of the Electro plastic Technique in the Cold drawing显示文摘 | TANG Guoyi ZHENG Mingxin ZHU Yonghua | 1998 | Journal of Materials Processing Technology1998，84，： | 1 |
| 14 | Luminescence of carbon nanotube bulbs显示文摘Carbon nanotube (CNT) bulbs made of decimeter-scale double-walled carbon nanotube (DWCNT) strands and films were fabricated and their luminescence properties, including the lighting efficiency, voltage-current relation and thermal stability were investigated. The results show that the DWCNT bulb has a comparable spectrum of visible light with tungsten bulb and its average efficiency is 40% higher than that of a tungsten filament at the same temperature (1400―2300 K). The nanotube filaments show both resistance and thermal stability over a large temperature region. No obvious damage was found for a nanotube bulb illuminating at 2300 K for more than 24 hours in vacuum. | LI ChuanGang WANG KunLin WEI JinQuan WEI BingQing ZHU HongWei WANG ZhiCheng LUO JianBin LIU WenJin ZHENG MingXin WU DeHai | 2007 | Chinese Science Bulletin2007，52，1： | 0 |
| 15 | Simulation Research on Performance of a Novel Heating and Cooling System with Thermoelectric Module显示文摘This work proposes a novel heating and cooling system,with incorporated thermoelectric module,that can achieve energy balance using a self-water supply heat exchange subsystem.The thermoelectric effect is used to achieve controlled and adjustable heating of the circulating water.Simulations were conducted to study the thermal performance of the system while it simultaneously produces hot and cold water,with different working conditions for the hot-and cold-side water outlets.The results show that the water temperature at the hot side outlet increases from 32℃to 75℃when the power increases from 4.5 to 50 W.Additionally,the use of thermoelectric modules to heat water and recover waste heat is 22%more efficient than ordinary electric water heating systems. | Mingxin Li Benzhi Hou Yihua Zheng | 2022 | Journal of Renewable Materials2022，10，11： | 0 |
| 16 | Effect of alkali metal ions on the formation mechanism of HCN during pyridine pyrolysis显示文摘The catalytic effects of alkali metal ions(Na^(+)and K^(+))on NO_(x)precursor formation during coal pyrolysis were investigated using the N-containing compound pyridine as a model compound.Density functional theory calculations at the B3LYP/6-31G(d,p)level of theory were conducted to elucidate the mechanism of pyridine pyrolysis and the pathways for HCN formation.The calculation results indicate that Na^(+)and K^(+)have distinct influences on different pyrolysis reactions;these alkali metal ions facilitate the initial hydrogen transfer from C_(1)to N and C_(2),whereas they hinder the other hydrogen migration reactions.Both Na^(+)and K^(+)significantly reduce the activation energies for C–C bond breakage and triple-bond formation,whereas they increase the activation energies for the isomerization reactions.The different effects essentially result from the distinct charge distributions induced by the two ions.Due to the distinct influences on the different reactions,the rate-determining steps are modulated,affecting the competitiveness of the different possible pathways of HCN formation.The formation of HCN from pyridine is promoted in the presence of Na^(+)and K^(+)because all the overall activation energies are decreased for different pathways.The calculation results agree well with previous experimental studies.Thus,the findings offer a new and promising approach to reveal the formation mechanism of NO_(x)and facilitate the control of NO_(x)for coal utilization. | Ji Liu Wei Zhao Xinrui Fan Mingxin Xu Shu Zheng Qiang Lu | 2021 | International Journal of Coal Science & Technology2021，8，3： | 0 |
| 17 | Simulation of Moving Bed Erosion Based on the Weakly Compressible Smoothed Particle Hydrodynamics-Discrete Element Coupling Method显示文摘A complex interface exists between waterflow and solid particles during hydraulic soil erosion.In this study,the particle discrete element method(DEM)has been used to simulate the hydraulic erosion of a granular soil under moving bed conditions and surrounding terrain changes.Moreover,the weakly compressible smoothed particle hydrodynamics(WCSPH)approach has been exploited to simulate the instability process of the free surfacefluid and its propagation characteristics at the solid–liquid interface.The influence of a suspended medium on the waterflow dynamics has been characterized using the mixed viscosity concept accounting for the solid–liquid mixed particle volume ratio.Numerical simulations of wall-jet scouring and reservoir sedimentflushing on a mobile bed were performed and validated with experiments.The results show that the proposed WCSPH–DEM coupling model is highly suitable for determining parameters,such as the local maximum scour depth,the scour pit width,and the sand bed profile.The effects on the hydraulic erosion process of two important para-meters of the mixed viscosity coefficient(initial solid volume concentration and initial viscosity coefficient)are also discussed to a certain extent in this study. | Qingyun Zeng Mingxin Zheng Dan Huang | 2023 | Fluid Dynamics & Materials Processing2023，19，12： | 0 |
| 18 | A novel photonic crystal vertical cavity surface emitting laser based on coherent coupling显示文摘We demonstrate a novel oxide confined GaAs-based photonic crystal vertical cavity surface emitting laser (PC-VCSEL) operating at a wavelength of 850 nm based on coherent coupling. A ring-shaped light-emitting aperture is added to the conventional PC-VCSEL, and coherent coupling is achieved between the central defect aperture and the ring-shaped light-emitting aperture. Measurements show that under the continuous-wave (CW) injected current of 20 mA, a high power of 2 mW is obtained, and the side mode suppression ratio (SMSR) is larger than 20 dB. The average divergence angle is 4.2° at the current level of 20 mA. Compared with the results ever reported, the divergence angle is reduced. | LIU AnJin QU HongWei XING MingXin CHEN Wei ZHOU WenJun ZHENG WanHua | 2010 | Chinese Science Bulletin2010，55，2： | 0 |
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