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| 1 | Quantitative evaluation methods for waterflooded layers of conglomerate reservoir based on well logging data显示文摘The rapid changing near source, multi-stream depositional environment of conglomerate reservoirs leads to severe heterogeneity, complex lithology and physical properties, and large changes of oil layer resistivity. Quantitative evaluation of water-flooded layers has become an important but difficult focus for secondary development of oilfields. In this paper, based on the analysis of current problems in quantitative evaluation of water-flooded layers, the Kexia Group conglomerate reservoir of the Sixth District in the Karamay Oilfield was studied. Eight types of conglomerate reservoir lithology were identified effectively by a data mining method combined with the data from sealed coring wells, and then a multi-parameter model for quantitative evaluation of the water-flooded layers of the main oil-bearing lithology was developed. Water production rate, oil saturation and oil productivity index were selected as the characteristic parameters for quantitative evaluation of water-flooded layers of conglomerate reservoirs. Finally, quantitative evaluation criteria and identification rules for water-flooded layers of main oil-bearing lithology formed by integration of the three characteristic parameters of water-flooded layer and undisturbed formation resistivity. This method has been used in evaluation of the water-flooded layers of a conglomerate reservoir in the Karamay Oilfield and achieved good results, improving the interpretation accuracy and compliance rate. It will provide technical support for avoiding perforation of high water-bearing layers and for adjustment of developmental programs. | Tan Fengqi Li Hongqi Xu Changfu Li Qingyuan Peng Shouchang | 2010 | Petroleum Science2010，7，4： | 21 |
| 2 | Genome of Wild Mandarin and Domestication History of Mandarin显示文摘官员(柠檬 reticulata ) 是世界范围的最重要的柠檬庄稼之一。它的驯服被相信发生在华南,它是四几千年的官员耕作的中心之一。我们在 Nanling 区域附近收集了官员的自然野人口并且在附近栽培了 landraces。我们发现柠檬性的酸水平戏剧性地在栽培官员被减少。理解 ? 官员驯服的基因基础,我们 de novo 装配了野官员的一个草稿染色体并且分析了一套 104 个柠檬染色体。我们发现 Mangshan 官员是一种原始类型并且二个独立驯服事件发生了,分别地导致在北方和南方 Nanling 山的二组栽培官员(MD1 和 MD2 ) 。二个瓶颈和有效人口尺寸的二扩大为栽培官员的 MD1 组被识别。然而,在 MD2 组织 ? 在人口尺寸有长、连续的减少。MD1 和 MD2 官员从栽培 pummelo 种类显示出种间的基因渗入的不同模式。我们在官员的驯服期间在选择下面可能在基因在柠檬酸盐内容的规定包含了的 aconitate hydratase (ACO ) 识别了高分叉的一个区域,它是。这研究为现存野官员人口的地理起源提供具体基因证据并且使驯服和官员的进化历史清楚些。 | Lun Wang Fa He Yue Huang Jiaxian He Shuizhi Yang Jiwu Zeng Chongling Deng Xiaolin Jiang Yiwen Fang Shaohua Wen Rangwei Xu Huiwen Yu Xiaoming Yang Guangyan Zhong Chuanwu Chen Xiang Yan Changfu Zhou Hongyan Zhang Zongzhou Xie Robert M. Larkin Xiuxin Deng Qiang Xu | 2018 | Molecular Plant2018，11，8： | 14 |
| 3 | A Novel Integrated Stability Control Based on Differential Braking and Active Steering for Four-axle Trucks显示文摘Di erential braking and active steering have already been integrated to overcome their shortcomings. However, existing research mainly focuses on two-axle vehicles and controllers are mostly designed to use one control method to improve the other. Moreover, many experiments are needed to improve the robustness; therefore, these control methods are underutilized. This paper proposes an integrated control system specially designed for multi-axle vehicles, in which the desired lateral force and yaw moment of vehicles are determined by the sliding mode control algorithm. The output of the sliding mode control is distributed to the suitable wheels based on the abilities and potentials of the two control methods. Moreover, in this method, fewer experiments are needed, and the robustness and simultaneity are both guaranteed. To simplify the optimization system and to improve the computation speed, seven simple optimization subsystems are designed for the determination of control outputs on each wheel. The simulation results show that the proposed controller obviously enhances the stability of multi-axle trucks. The system improves 68% of the safe velocity, and its performance is much better than both di erential braking and active steering. This research proposes an integrated control system that can simultaneously invoke di erential braking and active steering of multi-axle vehicles to fully utilize the abilities and potentials of the two control methods. | Buyang Zhang Changfu Zong Guoying Chen Yanjun Huang Ting Xu | 2019 | Chinese Journal of Mechanical Engineering2019，32，1： | 6 |
| 4 | Influence of water content and shear rate on the mechanical behavior of soil-rock mixtures显示文摘Soil-rock mixtures(S-RMs) are widely distributed in the nature. The mesoscopic deformation and failure mechanisms as well as the macro-mechanical behaviors of the S-RMs depend largely upon the rate of deformation, water content and particle sizes. In this research, a series of large-scale direct shear tests with different water contents and different grain-size distributions were conducted to study the influence of the aforementioned factors on the mechanical properties of the S-RMs. Due to the effect of the rock blocks' breakage in the S-RMs, the relationship between the shear strength and the vertical stress of S-RM follows a power law instead of a linear one. It is found that there exists a threshold value for the vertical stress during the shearing process,below which the soil strength is mainly determined by the inter-locking of particles and the re-arrangement of meso-structure,and otherwise large-sized rock blocks are gradually broken into smaller fragments, resulting in a decrease in the soil strength.The shear rate can also significantly influence the degree of particle breakage and the meso-structural rearrangement of the SRMs, namely, under low shear rate, the particles of the samples are fully broken resulting in enhanced macro-strength. As a result, the lower the shear rate, the higher the macroscopic strength. So under unsaturated conditions, the water content will affect the strength of the S-RMs by reducing the strength of rock blocks. As the water content increases, the soil strength decreases gradually, and assumes a moderate value when the water content reaches 8%. At the same water content, the soil strength increases with the sizes of large rock blocks. For the occlusion, breakage and structure re-arrangement of the oversized rock blocks inside S-RM, which have a huge influence on the mechanical characteristics of the samples. | WEI HouZhen XU WenJie WEI ChangFu MENG QingShan | 2018 | Science China(Technological Sciences)2018，61，8： | 5 |
| 5 | Effect of operating parameters and reactor structure on moderate temperature dry desulfurization 显示文摘 | ZHANG Jie YOU Changfu QI Haiying HOU Bo CHEN Changhe XU Xuehang | 2006 | Environmental Scieme & Technology2006，40，13： | 1 |
| 6 | Development of coal combustion pollution control for SO2 and NOx in China显示文摘 | Xuehang Xu Changhe Chen Haiyin Qi Rong He Changfu You Guangming Xiang | 2000 | Fuel Processing Technology2000，62，： | 1 |
| 7 | Upconversion white-light emitting of Tm 3+ and Er 3+ codoped oxyfluoride and its achieving mechanism显示文摘 | Zhizhou Yu Qibin Yang Changfu Xu Yunxin Liu | 2009 | Materials Research Bulletin2009，，7： | 1 |
| 8 | Lift force on rotating sphere at low Reynolds numbers and high rotational speeds 显示文摘 | You changfu Qi Haiying Xu Xuchang | 2003 | ACTA Mechanica Sinca2003，19，4： | 1 |
| 9 | Synthetic Control Method for Crystallite Size of MOF-5显示文摘 | HAN Pengfei YUAN Changfu XU Junyi LIU Jin | 2014 | Chemical Research in Chinese Universities2014，30，3： | 1 |
| 10 | Intense ultraviolet and blue upconversion emissions in Yb3+-Tm3+ codoped stoichiometric Y7O6 F9 powder显示文摘 | Ma Mo Xu Changfu Yang Liwen | 2011 | Physica B2011，406，17： | 1 |
| 11 | Pure red upconversion emission from Yb 3 Al 5 O 12 phase doped with high Er 3+ concentration显示文摘 | Changfu Xu Qibin Yang Guozhong Ren Yunxin Liu | 2010 | Journal of Alloys and Compounds2010，，1： | 1 |
| 12 | Intense blue photo-luminescence of the Tm3+/Yb3+co-doped single-crystallinehexagonal phase NaYF4nanorods?显示文摘 | Zeng Songjun Ren Guozhong Xu Changfu | 2011 | J Alloy Compd2011，509，5： | 1 |
| 13 | Intense blue photoluminescence of the Tm 3+ /Yb 3+ co-doped single-crystalline hexagonal phase NaYF 4 nanorods显示文摘 | Songjun Zeng Guozhong Ren Changfu Xu | 2010 | Journal of Alloys and Compounds2010，，5： | 1 |
| 14 | Upconversion luminescence and magnetic properties of ligand-free monodisperse lanthanide doped BaGdF 5 nanocrystals显示文摘 | Changfu Xu Mo Ma Liwen Yang Songjun Zeng Qibin Yang | 2011 | Journal of Luminescence2011，，12： | 1 |
| 15 | Utilization of Ventilation Air Methane as a Supplementary Fuel at a Circulating Fluidized Bed Combustion Boiler 显示文摘 | YOU Changfu XU Xuchang | 2008 | Environmental Sci- ence & Technology2008，42，7： | 1 |
| 16 | Detection and significance of HBV in renal tissue of HBV associated glomerulonephrifis patients 显示文摘 | Ren Shuting Yu Linhua Xu Changfu | 2002 | ACAD J XJTU2002，14，2： | 1 |
| 17 | Experimental investigation of interparticle collision rate in particulate flow显示文摘 | Changfu You Hailiang Zhao Yi Cai Haiying Qi Xuchang Xu | 2004 | International Journal of Multiphase Flow2004，，9： | 1 |
| 18 | Enhanced 1-5 μm near-and mid-infrared emission in Ho/Ybcodoped TeO-ZnF oxyfluorotellurite glasses显示文摘Intense 1-5 μm infrared emission from near-to mid-infrared was obtained from Ho3+/Yb3+codoped TeO2-ZnF2 oxyfluorotellurite glasses which were prepared by melt-quenching method under the 980 nm LD excitation,and the emission intensity can be enhanced with the increase of ZnF2 content.Judd-Ofelt analysis was used to evaluate the radiative transition parameters of the excited levels according to the absorption spectra.The stimulated emission cross section of 5 I6→5 I8(1.2 μm),5 I7→5 I8(2.0μm),5 I6→5 I7(2.85 μm) and 5 I5→5 I6(4.0 μm) transitions were calculated to reach 0.639 × 10-20,0.760 ×10-20,0.985×10 20 and 0.484 × 10-20 cm2,respectively.The energy transfer coefficients(CDA) are enhanced with the increase of ZnF2 content and phonon contribution ratios of phonon assisted energy transfer process between Ho3+ and Yb3+were figured out.Our results demonstrate that these TeO2-ZnF2 glasses,which possess good thermal stability and transparency,low phonon energy(about 600 cm-1),excellent near-and mid-infrared emission in the range of 1-5 μm wavelength,would be promising material for infrared optical fibers and infrared lasers. | Yu Wang Changfu Xu Zhen Zhang Cheng Zheng Jintao Pei Lizhong Sun | 2020 | Journal of Rare Earths2020，38，10： | 0 |
| 19 | Relationship between Microstructure Evolution and the Luminescent Properties of Eu^(3+)-doped Yttrium Aluminum Garnet and Y_2O_3 Nano-powders显示文摘Eu3+-doped yttrium aluminum garnet(YAG) and Y2O3 composite phase nanoparticles were synthesized using a modified hydrothermal method.Sintering was performed at 800℃,which is considerably lower than the sintering temperature used in the conventional method.Y3+ in YAG and Y2O3 was partially substituted with Na+ by adding NaNO3 into the solution during sample synthesis.The microstructures and phase transformation process were characterized through X-ray diffraction,scanning electron microscopy,and transmission electron microscopy.The obtained results verified that the addition of Na+ promoted crystallinity and grain growth of the three phases,namely,Y2O3,Y4AI2O9,and Y3AI5O12.Highly efficient luminescence properties excited by 254 and 365 nm ultraviolet were achieved.In conclusion,the remarkable enhancement of the luminescence intensity with the addition of Na+ should be attributed to grain growth and improvement of crystallinity. | Jie Zhang Yongyi Gao Junjie Xiao Changfu Xu Yunxin Liu Qibin Yang | 2013 | Journal of Materials Science & Technology2013，29，3： | 0 |
| 20 | Upconversion Emission and Paramagnetism of Colloid Ba2 ErF7 and Ba2 ErF7 :Yb^(3+) Nanocrystals Synthesized with Solvothermal Method显示文摘Ultrasmall near-monodisperse Ba 2 ErF 7 nanocrystals with average crystal size 9.6 nm were synthesized with solvothermal method. The X-ray diffraction(XRD) and transmission electron microscopy(TEM) assays reveal that the as-synthesized Ba 2 ErF 7 nanocrystals are of the cubic structure with the cell parameter of 5.943, instead of the reported orthorhombic and tetragonal structure. Two emission bands originated from2H 11/2 /4H 3/2 →4I 15/2 and4F 9/2 →4I 15/2 of Er3+can be observed under a 980 nm laser excitation. The magnetic mass susceptibility of the as-synthesized Ba 2 ErF 7 nanocrystals reaches 4.293×10 5emu g 1Oe 1. | GONG Lunjun MA Mo XU Changfu LIN Jianguo YANG Qibin | 2013 | Journal of Wuhan University of Technology(Materials Science)2013，28，6： | 0 |
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