针对激光状态方程(Equation of state,EOS)实验对靶的高精度、表面高质量、材料密度达到或接近理论密度的需求以及金刚石切削技术不改变原材料密度、加工精度高、粗糙度小的特点,阐述了单点金刚石切削技术(SPDT)在EOS靶制备中的应用情况...针对激光状态方程(Equation of state,EOS)实验对靶的高精度、表面高质量、材料密度达到或接近理论密度的需求以及金刚石切削技术不改变原材料密度、加工精度高、粗糙度小的特点,阐述了单点金刚石切削技术(SPDT)在EOS靶制备中的应用情况,包括铝、铜等金属薄膜零件制备、多种结构整体式台阶靶制备、整体式楔形靶制备以及金刚石切削技术与其他技术结合制备阻抗匹配靶等靶零件。展开更多
As one of the most important ways to reduce the greenhouse gas emission,carbon dioxide（CO2）enhanced gas recovery（CO2-EGR） is attractive since the gas recovery can be enhanced simultaneously with CO2sequestration.B...As one of the most important ways to reduce the greenhouse gas emission,carbon dioxide（CO2）enhanced gas recovery（CO2-EGR） is attractive since the gas recovery can be enhanced simultaneously with CO2sequestration.Based on the existing equation of state（EOS） module of TOUGH2 MP,extEOS7C is developed to calculate the phase partition of H2O-CO2-CH4-NaCl mixtures accurately with consideration of dissolved NaCI and brine properties at high pressure and temperature conditions.Verifications show that it can be applied up to the pressure of 100 MPa and temperature of 150℃.The module was implemented in the linked simulator TOUGH2MP-FLAC3 D for the coupled hydro-mechanical simulations.A simplified three-dimensional（3D）1/4 model（2.2 km×1 km×1 km） which consists of the whole reservoir,caprock and baserock was generated based on the geological conditions of a gas field in the North German Basin.The simulation results show that,under an injection rate of 200,000 t/yr and production rate of 200,000 sm3/d,CO2breakthrough occurred in the case with the initial reservoir pressure of 5 MPa but did not occur in the case of 42 MPa.Under low pressure conditions,the pressure driven horizontal transport is the dominant process;while under high pressure conditions,the density driven vertical flow is dominant.Under the considered conditions,the CO2-EGR caused only small pressure changes.The largest pore pressure increase（2 MPa） and uplift（7 mm） occurred at the caprock bottom induced by only CO2injection.The caprock had still the primary stress state and its integrity was not affected.The formation water salinity and temperature variations of ±20℃ had small influences on the CO2-EGR process.In order to slow down the breakthrough,it is suggested that CO2-EGR should be carried out before the reservoir pressure drops below the critical pressure of CO2.展开更多
Spatially homogeneous and anisotropic Bianchi type-I cosmological model containing perfect fluid with quadratic equation of state has been diagnosed in general theory of relativity. To obtain a deterministic solution,...Spatially homogeneous and anisotropic Bianchi type-I cosmological model containing perfect fluid with quadratic equation of state has been diagnosed in general theory of relativity. To obtain a deterministic solution, we have used a relation between metric potentials. The exact solution of Einstein’s field equations thus obtained represents an expanding and decelerating universe. The physical and kinematical parameters of the model have also been analyzed with certain constrained between the parameters of the quadratic equation of state.展开更多
为探讨RD X基高聚物黏结炸药在小尺寸下爆轰产物的状态方程,采用两种直径(Φ10 m m和Φ25 m m)的圆筒试验研究了RD X基高聚物黏结炸药的做功能力,获得了圆筒壁膨胀位移、速度与时间的关系;利用非线性有限元动力学程序A n sy s/L s-D yn...为探讨RD X基高聚物黏结炸药在小尺寸下爆轰产物的状态方程,采用两种直径(Φ10 m m和Φ25 m m)的圆筒试验研究了RD X基高聚物黏结炸药的做功能力,获得了圆筒壁膨胀位移、速度与时间的关系;利用非线性有限元动力学程序A n sy s/L s-D yn a,对炸药的圆筒实验进行了数值模拟;通过与实验结果相比较,得到了RD X基高聚物黏结炸药爆轰产物JW L状态方程参数。展开更多
为了准确计算页岩油气储层中的界面张力,基于修正的Soave⁃Redlich⁃Kwong状态方程(SRK EoS)和修正的van der Waals(vdW)混合规则,建立一个预测纳米孔中油气界面张力的状态方程模型,该模型能描述纳米孔中孔隙半径和分子—分子间相互作用...为了准确计算页岩油气储层中的界面张力,基于修正的Soave⁃Redlich⁃Kwong状态方程(SRK EoS)和修正的van der Waals(vdW)混合规则,建立一个预测纳米孔中油气界面张力的状态方程模型,该模型能描述纳米孔中孔隙半径和分子—分子间相互作用的影响。将状态方程与等张比容模型结合,建立基于气液相平衡的界面张力计算模型,并提出具体计算方法。建立的SRK模型与vdW模型和实验数据对比表明:在相同的温度下,随着压力的升高,甲烷-正葵烷(C_(1)⁃nC_(10))和氮气-正葵烷(C_(2)⁃nC_(10))混合物在纳米孔中的界面张力逐渐减小,SRK和vdW模型均能准确地预测界面张力,但SRK模型的计算结果更准确。在298.15 K和326.15 K,SRK模型计算的C_(1)⁃nC_(10)混合物的平均绝对相对偏差为12.42%和7.11%,而C_(2)⁃nC_(10)混合物为2.83%和3.85%。vdW模型计算的C_(1)⁃nC_(10)混合物的平均绝对相对偏差为17.10%和4.24%,而C_(2)⁃nC_(10)混合物为3.98%和7.53%。通过SRK模型对体积相和纳米孔中的界面张力预测表明:在相同的温度压力条件下,体积相中的C_(1)⁃nC_(10)和C_(2)⁃nC_(10)混合物界面张力大于纳米孔中的界面张力。对不同孔隙半径的纳米孔中的界面张力预测表明:随着孔隙半径的减小,混合物的界面张力逐渐减小,且在较低的压力下,孔隙半径越小,界面张力的减小程度越大,而在较高的压力下,由于界面张力比较小,孔隙半径的影响也较小。提出的SRK模型能准确地预测纳米孔中的界面张力,为预测纳米孔中油气界面张力提供了一种新思路。展开更多
文摘针对激光状态方程(Equation of state,EOS)实验对靶的高精度、表面高质量、材料密度达到或接近理论密度的需求以及金刚石切削技术不改变原材料密度、加工精度高、粗糙度小的特点,阐述了单点金刚石切削技术(SPDT)在EOS靶制备中的应用情况,包括铝、铜等金属薄膜零件制备、多种结构整体式台阶靶制备、整体式楔形靶制备以及金刚石切削技术与其他技术结合制备阻抗匹配靶等靶零件。
基金funded by the National Natural Science Foundation of China(Grant No.NSFC51374147)the German Society for Petroleum and Coal Science and Technology(Grant No.DGMK680-4)
文摘As one of the most important ways to reduce the greenhouse gas emission,carbon dioxide（CO2）enhanced gas recovery（CO2-EGR） is attractive since the gas recovery can be enhanced simultaneously with CO2sequestration.Based on the existing equation of state（EOS） module of TOUGH2 MP,extEOS7C is developed to calculate the phase partition of H2O-CO2-CH4-NaCl mixtures accurately with consideration of dissolved NaCI and brine properties at high pressure and temperature conditions.Verifications show that it can be applied up to the pressure of 100 MPa and temperature of 150℃.The module was implemented in the linked simulator TOUGH2MP-FLAC3 D for the coupled hydro-mechanical simulations.A simplified three-dimensional（3D）1/4 model（2.2 km×1 km×1 km） which consists of the whole reservoir,caprock and baserock was generated based on the geological conditions of a gas field in the North German Basin.The simulation results show that,under an injection rate of 200,000 t/yr and production rate of 200,000 sm3/d,CO2breakthrough occurred in the case with the initial reservoir pressure of 5 MPa but did not occur in the case of 42 MPa.Under low pressure conditions,the pressure driven horizontal transport is the dominant process;while under high pressure conditions,the density driven vertical flow is dominant.Under the considered conditions,the CO2-EGR caused only small pressure changes.The largest pore pressure increase（2 MPa） and uplift（7 mm） occurred at the caprock bottom induced by only CO2injection.The caprock had still the primary stress state and its integrity was not affected.The formation water salinity and temperature variations of ±20℃ had small influences on the CO2-EGR process.In order to slow down the breakthrough,it is suggested that CO2-EGR should be carried out before the reservoir pressure drops below the critical pressure of CO2.
文摘Spatially homogeneous and anisotropic Bianchi type-I cosmological model containing perfect fluid with quadratic equation of state has been diagnosed in general theory of relativity. To obtain a deterministic solution, we have used a relation between metric potentials. The exact solution of Einstein’s field equations thus obtained represents an expanding and decelerating universe. The physical and kinematical parameters of the model have also been analyzed with certain constrained between the parameters of the quadratic equation of state.
文摘为探讨RD X基高聚物黏结炸药在小尺寸下爆轰产物的状态方程,采用两种直径(Φ10 m m和Φ25 m m)的圆筒试验研究了RD X基高聚物黏结炸药的做功能力,获得了圆筒壁膨胀位移、速度与时间的关系;利用非线性有限元动力学程序A n sy s/L s-D yn a,对炸药的圆筒实验进行了数值模拟;通过与实验结果相比较,得到了RD X基高聚物黏结炸药爆轰产物JW L状态方程参数。
