甲烷水合物蓄冷量的确定是甲烷水合物蓄冷降温技术实现工业化的关键.为探究SDS对甲烷水合物蓄冷量的影响,根据Clausius-Clapeyron方程及三参数对应态原理,建立甲烷水合物蓄冷量的计算模型.利用可视化水合物蓄冷实验系统,结合定温压力搜...甲烷水合物蓄冷量的确定是甲烷水合物蓄冷降温技术实现工业化的关键.为探究SDS对甲烷水合物蓄冷量的影响,根据Clausius-Clapeyron方程及三参数对应态原理,建立甲烷水合物蓄冷量的计算模型.利用可视化水合物蓄冷实验系统,结合定温压力搜索法测定四组不同SDS浓度体系下甲烷水合物的相平衡条件.依据实验数据和该模型计算得到不同体系、不同相平衡参数下甲烷水合物的蓄冷量.结果表明：甲烷水合物具有较高的蓄冷密度,蓄冷量达40～ 60 k J/mol;甲烷水合物的蓄冷量不但与相平衡条件有关,还与SDS的添加浓度有关.相平衡温度越高、SDS添加浓度越高,甲烷气体生成水合物时蓄冷量越低.该研究为甲烷水合物蓄冷降温系统的研制提供了参考.展开更多
以吲哚乙酸（IAA）为模板分子、乙腈为致孔剂,采用沉淀聚合法制备了其分子印迹聚合物,通过静态吸附实验研究了致孔剂乙腈的用量及4-乙烯基吡啶（4-VP）和丙烯酰胺（AA）两种不同性质的功能单体（M）对印迹聚合物吸附性能的影响。结果表...以吲哚乙酸（IAA）为模板分子、乙腈为致孔剂,采用沉淀聚合法制备了其分子印迹聚合物,通过静态吸附实验研究了致孔剂乙腈的用量及4-乙烯基吡啶（4-VP）和丙烯酰胺（AA）两种不同性质的功能单体（M）对印迹聚合物吸附性能的影响。结果表明,以4-VP为M,乙腈的加入量分别为20、25、37.5和50 m L时,制备的印迹聚合物P1~P4均具有良好的分散性,且聚合物P4对IAA具有最显著的印迹效应（印迹因子IF=2.92）;而在同样条件下以AA为M的印迹聚合物的印迹效应较小（IF=1.73）。选择性实验表明,聚合物P4能够从吲哚羧酸同系物中选择性结合IAA。Scatchard分析表明,聚合物P4对IAA表现出两类结合位点,其高亲和力与低亲和力结合位点的平衡离解常数分别为Kd1=0.798 mmol/L和Kd2=7.76 mmol/L,对应的最大结合量分别为21.0和90.7μmol/g。展开更多
A new class of bilcvel generalized mixed equilibrium problems involving setvalued mappings is introduced and studied in a real Banach space. By using the auxiliary principle technique, new iterative algorithms for sol...A new class of bilcvel generalized mixed equilibrium problems involving setvalued mappings is introduced and studied in a real Banach space. By using the auxiliary principle technique, new iterative algorithms for solving the generalized mixed equilibrium problems and bilevel generalized mixed equilibrium problems involving set-valued mappings are suggested and analyzed. Existence of solutions and strong convergence of the iterative sequences generated by the algorithms are proved under quite mild conditions. The behavior of the solution set of the generalized mixed equilibrium problems and bilevel generalized mixed equilibrium problems is also discussed. These results are new and generalize some recent results in this field.展开更多
In this work,ethylene glycol monomethylether(EE) was chosen as an entrainer for the azeotropic distillation of 1,3,5-trimethylbenzene+1-methyl-2-ethylbenzene system to investigate the influence of the entrainer on vap...In this work,ethylene glycol monomethylether(EE) was chosen as an entrainer for the azeotropic distillation of 1,3,5-trimethylbenzene+1-methyl-2-ethylbenzene system to investigate the influence of the entrainer on vapor liquid equilibrium(VLE) of this system.Three sets of binary VLE data in the system consisting of EE + 1,3,5-trimethylbenzene +1-methyl-2-ethylbenzene were measured using the Dvorak-Boublik still.The binary parameters of NRTL model were correlated by using the likelihood method.The ternary VLE data of the system were measured as well and were predicted by using the binary parameters of NRTL model.The test results indicated that the binary data passed the thermodynamic consistency tests,and the difference between the predicted values of ternary VLE and the experimental data reached the research standard for VLE data.Addition of EE had a great influence on the relative volatility between 1,3,5-trimethylbenzene and 1-methl-2-ethyl-benzene:when the ratio of solvent was 4,and the relative volatility between 1,3,5-trimethylbenzene and 1-methyl-2-ethylbenzene increased from 1.0125(without solvent addition) to 1.283.展开更多
Employing first-principles methods, based on the density functional theory, this paper investigates the ground state geometric and electronic properties of pure gold clusters, pure yttrium clusters and gold clusters d...Employing first-principles methods, based on the density functional theory, this paper investigates the ground state geometric and electronic properties of pure gold clusters, pure yttrium clusters and gold clusters doped each with one yttrium atom. It is shown that the average bond lengths in the Aun-1Y（n≤9） bimetallic clusters are shorter than those in the corresponding pure gold and yttrium clusters. The most stable isomers of the yttrium-doped gold clusters tend to equally delocalize valence s, p and d electrons of the constituent atoms over the entire structure. The Y atom has maximum number of neighbouring Au atom, which tends to be energetically favourable in the lowest-energy equilibrium structures, because the Au-Y bond is stronger than the Au-Au bond. The three-dimensional isomers of Aun-1Y structures are found in an early appearance starting at n=5 （Au4Y）. Calculated vertical ionization potential and electron affinities as a function of the cluster size show odd-even oscillatory behaviour, and resemble pure gold clusters. However, one of the most striking feature of pure yttrium clusters is the absence of odd-even alternation, in agreement with mass spectrometric observations. The HOMO LUMO gap of Au3Y is the biggest in all the doped Aun-1Y（n≤9） bimetallic clusters.展开更多
Ideal point method is one of the methods to solve multi-objective problem. It is applied to forest harvest regu-lation, and showed very good results by analyzing changes of quantitative indexes of forest resource stru...Ideal point method is one of the methods to solve multi-objective problem. It is applied to forest harvest regu-lation, and showed very good results by analyzing changes of quantitative indexes of forest resource structure before andafter the regulation. This method can be applied as one of the mathematical tools in forest harvest regulation.展开更多
文摘甲烷水合物蓄冷量的确定是甲烷水合物蓄冷降温技术实现工业化的关键.为探究SDS对甲烷水合物蓄冷量的影响,根据Clausius-Clapeyron方程及三参数对应态原理,建立甲烷水合物蓄冷量的计算模型.利用可视化水合物蓄冷实验系统,结合定温压力搜索法测定四组不同SDS浓度体系下甲烷水合物的相平衡条件.依据实验数据和该模型计算得到不同体系、不同相平衡参数下甲烷水合物的蓄冷量.结果表明：甲烷水合物具有较高的蓄冷密度,蓄冷量达40～ 60 k J/mol;甲烷水合物的蓄冷量不但与相平衡条件有关,还与SDS的添加浓度有关.相平衡温度越高、SDS添加浓度越高,甲烷气体生成水合物时蓄冷量越低.该研究为甲烷水合物蓄冷降温系统的研制提供了参考.
文摘以吲哚乙酸（IAA）为模板分子、乙腈为致孔剂,采用沉淀聚合法制备了其分子印迹聚合物,通过静态吸附实验研究了致孔剂乙腈的用量及4-乙烯基吡啶（4-VP）和丙烯酰胺（AA）两种不同性质的功能单体（M）对印迹聚合物吸附性能的影响。结果表明,以4-VP为M,乙腈的加入量分别为20、25、37.5和50 m L时,制备的印迹聚合物P1~P4均具有良好的分散性,且聚合物P4对IAA具有最显著的印迹效应（印迹因子IF=2.92）;而在同样条件下以AA为M的印迹聚合物的印迹效应较小（IF=1.73）。选择性实验表明,聚合物P4能够从吲哚羧酸同系物中选择性结合IAA。Scatchard分析表明,聚合物P4对IAA表现出两类结合位点,其高亲和力与低亲和力结合位点的平衡离解常数分别为Kd1=0.798 mmol/L和Kd2=7.76 mmol/L,对应的最大结合量分别为21.0和90.7μmol/g。
基金supported by the Scientific Research Fun of Sichuan Normal University (11ZDL01)the Sichuan Province Leading Academic Discipline Project (SZD0406)
文摘A new class of bilcvel generalized mixed equilibrium problems involving setvalued mappings is introduced and studied in a real Banach space. By using the auxiliary principle technique, new iterative algorithms for solving the generalized mixed equilibrium problems and bilevel generalized mixed equilibrium problems involving set-valued mappings are suggested and analyzed. Existence of solutions and strong convergence of the iterative sequences generated by the algorithms are proved under quite mild conditions. The behavior of the solution set of the generalized mixed equilibrium problems and bilevel generalized mixed equilibrium problems is also discussed. These results are new and generalize some recent results in this field.
基金supported by the SINOPEC Corporation (Contact No. 408069)
文摘In this work,ethylene glycol monomethylether(EE) was chosen as an entrainer for the azeotropic distillation of 1,3,5-trimethylbenzene+1-methyl-2-ethylbenzene system to investigate the influence of the entrainer on vapor liquid equilibrium(VLE) of this system.Three sets of binary VLE data in the system consisting of EE + 1,3,5-trimethylbenzene +1-methyl-2-ethylbenzene were measured using the Dvorak-Boublik still.The binary parameters of NRTL model were correlated by using the likelihood method.The ternary VLE data of the system were measured as well and were predicted by using the binary parameters of NRTL model.The test results indicated that the binary data passed the thermodynamic consistency tests,and the difference between the predicted values of ternary VLE and the experimental data reached the research standard for VLE data.Addition of EE had a great influence on the relative volatility between 1,3,5-trimethylbenzene and 1-methl-2-ethyl-benzene:when the ratio of solvent was 4,and the relative volatility between 1,3,5-trimethylbenzene and 1-methyl-2-ethylbenzene increased from 1.0125(without solvent addition) to 1.283.
基金Project supported by the Education Committee of Chongqing (Grant No KJ051105)the National Natural Science Foundation of China (Grant No 10276028)
文摘Employing first-principles methods, based on the density functional theory, this paper investigates the ground state geometric and electronic properties of pure gold clusters, pure yttrium clusters and gold clusters doped each with one yttrium atom. It is shown that the average bond lengths in the Aun-1Y（n≤9） bimetallic clusters are shorter than those in the corresponding pure gold and yttrium clusters. The most stable isomers of the yttrium-doped gold clusters tend to equally delocalize valence s, p and d electrons of the constituent atoms over the entire structure. The Y atom has maximum number of neighbouring Au atom, which tends to be energetically favourable in the lowest-energy equilibrium structures, because the Au-Y bond is stronger than the Au-Au bond. The three-dimensional isomers of Aun-1Y structures are found in an early appearance starting at n=5 （Au4Y）. Calculated vertical ionization potential and electron affinities as a function of the cluster size show odd-even oscillatory behaviour, and resemble pure gold clusters. However, one of the most striking feature of pure yttrium clusters is the absence of odd-even alternation, in agreement with mass spectrometric observations. The HOMO LUMO gap of Au3Y is the biggest in all the doped Aun-1Y（n≤9） bimetallic clusters.
文摘Ideal point method is one of the methods to solve multi-objective problem. It is applied to forest harvest regu-lation, and showed very good results by analyzing changes of quantitative indexes of forest resource structure before andafter the regulation. This method can be applied as one of the mathematical tools in forest harvest regulation.
