The invasion of various pollutant sources and lack of water circulation may easily lead to the eutrophication and deteriorated water quality of the landscape water system.This study focuses on the application of air f...The invasion of various pollutant sources and lack of water circulation may easily lead to the eutrophication and deteriorated water quality of the landscape water system.This study focuses on the application of air floatation method in water quality maintenance with the eco-landscape pool of Zhongxing Mangrove Bay as the study object,so as to provide a scheme for maintaining the water quality of artificial lakes.展开更多
In this paper, a high stiffness rectangular floatation cushion with a variable-section pressure equalizing groove of an elastic membrane for a pneumato-static slideway is presented and designed in order to increase st...In this paper, a high stiffness rectangular floatation cushion with a variable-section pressure equalizing groove of an elastic membrane for a pneumato-static slideway is presented and designed in order to increase stiffness of the floatation cushion. Gas film pressure distribution and carrying capacity of the floatation cushion are studied through theoretical analysis and by using the overlapping stitching technique. The carrying capacity and stiffness were obtained by using the coupling procedure of the gas lubrication governing equation and elastic deformation of the membrane governing equation. The results of theoretical calculations can obtain a conclusion that the effect of the gas pressure makes the annular elastic membrane elastically deform that brings about changes of throttling area and pressure groove depth of the floatation cushion. It makes carrying capacity and stiffness of the new style floata- tion cushion markedly improve over the conventional flotation cushion. The new floatation cushion has a wider ap- plication and popularization of space. Key words： floatation cushion; variable-section pressure equalizing groove;stiffness展开更多
A new method for indirect determination of cetyl-trimethyl ammonium bromide (CTMAB) with NaCl and NH4SCN by floatation and separation of zinc has been studied. The study shows that Zn(II) can associate with NH4SCN an...A new method for indirect determination of cetyl-trimethyl ammonium bromide (CTMAB) with NaCl and NH4SCN by floatation and separation of zinc has been studied. The study shows that Zn(II) can associate with NH4SCN and CTMAB to form insoluble ternary ion-association complex, and the precipitate can float on the surface of the liquid phase. A good linear relationship is observed between the floatation yield (E%) of Zn(II) and the amount of CTMAB. On the ground, CTMAB can be indirectly determined by determining E% of Zn(II). The results were satisfactory.展开更多
A green method for separating and enriching trace tetracycline （TC） in environment water by Aqueous Two-phase Gas Floatation Spectrophotometry has been proposed, the principium was discussed. In this paper, the hydr...A green method for separating and enriching trace tetracycline （TC） in environment water by Aqueous Two-phase Gas Floatation Spectrophotometry has been proposed, the principium was discussed. In this paper, the hydrophobic complex composed of Mg（II） and TC was floated into organic phase under the optimal conditions： pH=10, the floatation equipment is home-made, n-propyl alcohol as the organic solvent, sodium chloride as the separating phase reagent. The data were obtained by spectrophotometry after floatation; The linear regression equation is A=2.33×10^5C（mol/L）＋0.2179, linear range is from 3.77×10^-7mol/L to 6.32×10^-5 mol/L, respectively, with thecorrelation coefficient （r） better than 0.9997, relative recoveries is 99.7% to 100.3%, limit of detection was 4.29×10^-5mol/L, The method can be applied to analyse the trace TC in water sample, the result is better.展开更多
为探究波浪环境下带助浮装置航行体下落冲击过程中的流场以及运动演化特性,基于CFD(computational fluid dynamics)数值模拟技术,在方法上耦合了VOF(volume of fluid)多相流模型、k-ωSST湍流模型、Schnerr-Sauer空化模型以及Stokes五...为探究波浪环境下带助浮装置航行体下落冲击过程中的流场以及运动演化特性,基于CFD(computational fluid dynamics)数值模拟技术,在方法上耦合了VOF(volume of fluid)多相流模型、k-ωSST湍流模型、Schnerr-Sauer空化模型以及Stokes五阶非线性波理论,建立了一套针对入水冲击问题的数值计算方法,并采用速度边界法进行造波。经验证,试验与数值结果在下落位移上对比差异较小,该数值方法可靠有效,且造波结果与Stokes五阶非线性波理论吻合较好。然后,基于构建的数值方法,在不同波浪环境下对带助浮装置航行体下落入水冲击过程进行了数值模拟,计算带助浮装置航行体冲击过程的位移、速度、加速度以及助浮装置受力情况,分析冲击过程中航行体的运动学参数、动力学参数以及入水空泡流场演化过程,总结了波浪环境下带助浮装置航行体的入水冲击特性。结果表明,波浪环境对下落冲击过程的影响主要体现在运动衰减段,水平方向的冲击相较于垂直方向的冲击受到波浪环境的影响要大得多,不同海况对航行体的水平冲击造成的影响主要是通过影响入水空泡的形成与溃灭过程实现的。展开更多
We theoretically investigate the Autler-Townes （AT） splitting in the photoelectron spectra of three-level ladder K2 molecule driven by a pump-probe pulse via employing the time- dependent wave packet approach. The d...We theoretically investigate the Autler-Townes （AT） splitting in the photoelectron spectra of three-level ladder K2 molecule driven by a pump-probe pulse via employing the time- dependent wave packet approach. The dependence of AT splitting on two laser intensities and wavelengths are studied in detail. We firstly quantify these effects on peak shift and AT separation. The photoelectron spectra show double splitting with symmetric profiles, but with asymmetric profiles when the wavelength is changed. The magnitude of AT splitting increases with the pump laser intensity, but does not vary with probe intensity. The shifts of the absorption peaks and the splitting between AT doublet are predicted by using an analyt- ical fitting function when the intensity/wavelength of one of the two fields is changed. These novel results are of importance for the molecular spectroscopy and may further stimulate the first principles theoretical studies analytically.展开更多
As a core compulsory course for English majors majoring in teacher education,Literary Theory and Criticism plays an important role in enhancing text understanding,cultivating critical thinking,and shaping correct valu...As a core compulsory course for English majors majoring in teacher education,Literary Theory and Criticism plays an important role in enhancing text understanding,cultivating critical thinking,and shaping correct values in the future development of students.Influenced by traditional teaching ideas,students have many difficulties when learning this course,such as insufficient theoretical understanding,inadequate ability improvement,and not enough investment in course learning.In response to the above issues,this course focuses closely on the fundamental task of“cultivating virtue and nurturing people”,relying on modern information technology and introducing research methods of digital humanities.This course uses“7C”teaching mode under the“three-level integration”,in which“teaching”and“education”are carried out synchronously,and“teacher”and“student”are developed together,in order to greatly enhance students’learning participation and course satisfaction.展开更多
文摘The invasion of various pollutant sources and lack of water circulation may easily lead to the eutrophication and deteriorated water quality of the landscape water system.This study focuses on the application of air floatation method in water quality maintenance with the eco-landscape pool of Zhongxing Mangrove Bay as the study object,so as to provide a scheme for maintaining the water quality of artificial lakes.
文摘In this paper, a high stiffness rectangular floatation cushion with a variable-section pressure equalizing groove of an elastic membrane for a pneumato-static slideway is presented and designed in order to increase stiffness of the floatation cushion. Gas film pressure distribution and carrying capacity of the floatation cushion are studied through theoretical analysis and by using the overlapping stitching technique. The carrying capacity and stiffness were obtained by using the coupling procedure of the gas lubrication governing equation and elastic deformation of the membrane governing equation. The results of theoretical calculations can obtain a conclusion that the effect of the gas pressure makes the annular elastic membrane elastically deform that brings about changes of throttling area and pressure groove depth of the floatation cushion. It makes carrying capacity and stiffness of the new style floata- tion cushion markedly improve over the conventional flotation cushion. The new floatation cushion has a wider ap- plication and popularization of space. Key words： floatation cushion; variable-section pressure equalizing groove;stiffness
文摘A new method for indirect determination of cetyl-trimethyl ammonium bromide (CTMAB) with NaCl and NH4SCN by floatation and separation of zinc has been studied. The study shows that Zn(II) can associate with NH4SCN and CTMAB to form insoluble ternary ion-association complex, and the precipitate can float on the surface of the liquid phase. A good linear relationship is observed between the floatation yield (E%) of Zn(II) and the amount of CTMAB. On the ground, CTMAB can be indirectly determined by determining E% of Zn(II). The results were satisfactory.
基金National Nature Science Foundation Project (20777029)Jiangsu Higher Education Institution Nature Science Foundation Project (07KJB610021)
文摘A green method for separating and enriching trace tetracycline （TC） in environment water by Aqueous Two-phase Gas Floatation Spectrophotometry has been proposed, the principium was discussed. In this paper, the hydrophobic complex composed of Mg（II） and TC was floated into organic phase under the optimal conditions： pH=10, the floatation equipment is home-made, n-propyl alcohol as the organic solvent, sodium chloride as the separating phase reagent. The data were obtained by spectrophotometry after floatation; The linear regression equation is A=2.33×10^5C（mol/L）＋0.2179, linear range is from 3.77×10^-7mol/L to 6.32×10^-5 mol/L, respectively, with thecorrelation coefficient （r） better than 0.9997, relative recoveries is 99.7% to 100.3%, limit of detection was 4.29×10^-5mol/L, The method can be applied to analyse the trace TC in water sample, the result is better.
文摘为探究波浪环境下带助浮装置航行体下落冲击过程中的流场以及运动演化特性,基于CFD(computational fluid dynamics)数值模拟技术,在方法上耦合了VOF(volume of fluid)多相流模型、k-ωSST湍流模型、Schnerr-Sauer空化模型以及Stokes五阶非线性波理论,建立了一套针对入水冲击问题的数值计算方法,并采用速度边界法进行造波。经验证,试验与数值结果在下落位移上对比差异较小,该数值方法可靠有效,且造波结果与Stokes五阶非线性波理论吻合较好。然后,基于构建的数值方法,在不同波浪环境下对带助浮装置航行体下落入水冲击过程进行了数值模拟,计算带助浮装置航行体冲击过程的位移、速度、加速度以及助浮装置受力情况,分析冲击过程中航行体的运动学参数、动力学参数以及入水空泡流场演化过程,总结了波浪环境下带助浮装置航行体的入水冲击特性。结果表明,波浪环境对下落冲击过程的影响主要体现在运动衰减段,水平方向的冲击相较于垂直方向的冲击受到波浪环境的影响要大得多,不同海况对航行体的水平冲击造成的影响主要是通过影响入水空泡的形成与溃灭过程实现的。
基金The code used in our calculation is provided by Pro- fessor Ke-li Han from Dalian Institute of Chemical Physics, Chinese Academy of Science, and we appreci- ate his help and kind advice. This work was supported by the National Natural Science Foundation of China （No.11447020）, the Natural Science Foundation of Hu- nan province （No.2015JJ3104）, and the Scientific Re- search Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
文摘We theoretically investigate the Autler-Townes （AT） splitting in the photoelectron spectra of three-level ladder K2 molecule driven by a pump-probe pulse via employing the time- dependent wave packet approach. The dependence of AT splitting on two laser intensities and wavelengths are studied in detail. We firstly quantify these effects on peak shift and AT separation. The photoelectron spectra show double splitting with symmetric profiles, but with asymmetric profiles when the wavelength is changed. The magnitude of AT splitting increases with the pump laser intensity, but does not vary with probe intensity. The shifts of the absorption peaks and the splitting between AT doublet are predicted by using an analyt- ical fitting function when the intensity/wavelength of one of the two fields is changed. These novel results are of importance for the molecular spectroscopy and may further stimulate the first principles theoretical studies analytically.
基金supported by Henan Province Teaching Reform and Practice Project(Project Fund No.135)—Research on the Reform of Literary Theory Courses for English Majors in Universities.
文摘As a core compulsory course for English majors majoring in teacher education,Literary Theory and Criticism plays an important role in enhancing text understanding,cultivating critical thinking,and shaping correct values in the future development of students.Influenced by traditional teaching ideas,students have many difficulties when learning this course,such as insufficient theoretical understanding,inadequate ability improvement,and not enough investment in course learning.In response to the above issues,this course focuses closely on the fundamental task of“cultivating virtue and nurturing people”,relying on modern information technology and introducing research methods of digital humanities.This course uses“7C”teaching mode under the“three-level integration”,in which“teaching”and“education”are carried out synchronously,and“teacher”and“student”are developed together,in order to greatly enhance students’learning participation and course satisfaction.
