The integrated hydraulic transformer has a compact structure and no throttling loss in the process of pressure regulation.It is widely used in the common pressure rail hydrostatic transmission system.The integrated hy...The integrated hydraulic transformer has a compact structure and no throttling loss in the process of pressure regulation.It is widely used in the common pressure rail hydrostatic transmission system.The integrated hydraulic transformer is realized by designing more than three ports on the distribution plate,and the voltage transformation characteristics of the integrated hydraulic transformer with different port numbers are different.In this paper,the influence of port number on the pressure ratio of integrated hydraulic transformer was studied,and the pressure ratio characteristics of 3⁃ports,4⁃ports,and 5⁃ports integrated hydraulic transformer were obtained,and an experimental platform was built for experimental verification,which shows that the simulation results are consistent with the experimental results and provides a theoretical basis for the design of integrated hydraulic transformer.展开更多
Objective: to carry out in-depth analysis of the common problems in the current conventional HPLC inspection, and put forward targeted solution measures to effectively improve the accuracy of the conventional HPLC ins...Objective: to carry out in-depth analysis of the common problems in the current conventional HPLC inspection, and put forward targeted solution measures to effectively improve the accuracy of the conventional HPLC inspection, and to ensure the smooth development of the laboratory work. Methods: the main problems of routine high performance liquid chromatography were that the number of theoretical plates was not satisfactory, the peak area of the tested substance in the test sample suddenly increased or the peak type was abnormal, the peak of the control sample was multi peak and the difference of resolution. Conclusion: routine HPM tests directly affect the test accuracy, and adjusting the details of routine HPM tests can effectively improve the quality of routine FAPM tests.展开更多
Effective monitoring of atmospheric concentrations is vital for assessing the Stockholm Convention's effectiveness on persistent organic pollutants(POPs).This task,particularly challenging in polar regions due to ...Effective monitoring of atmospheric concentrations is vital for assessing the Stockholm Convention's effectiveness on persistent organic pollutants(POPs).This task,particularly challenging in polar regions due to low air concentrations and temperature fluctuations,requires robust sampling techniques.Furthermore,the influence of temperature on the sampling efficiency of polyurethane foam discs remains unclear.Here we employ a flow-through sampling(FTS)column coupled with an active pump to collect air samples at varying temperatures.We delved into breakthrough profiles of key pollutants,such as polycyclic aromatic hydrocarbons(PAHs),polychlorobiphenyls(PCBs),and organochlorine pesticides(OCPs),and examined the temperature-dependent behaviors of the theoretical plate number(N)and breakthrough volume(VB)using frontal chromatography theory.Our findings reveal a significant relationship between temperature dependence coefficients(K_(TN),K_(TV))and compound volatility,with decreasing values as volatility increases.While distinct trends are noted for PAHs,PCBs,and OCPs in KTN,KTV values exhibit similar patterns across all chemicals.Moreover,we establish a binary linear correlation between log(V_(B)/m^(3)),1/(T/K),and N,simplifying breakthrough level estimation by enabling easy conversion between N and VB.Finally,an empirical linear solvation energy relationship incorporating a temperature term is developed,yielding satisfactory results for N at various temperatures.This approach holds the potential to rectify temperature-related effects and loss rates in historical data from long-term monitoring networks,benefiting polar and remote regions.展开更多
基金the National Key Research and Development Plan Projects(Grant No.2018YFB2001200)the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant Nos.19KJB460026,19KJA140002)the Six Talent Peak Training Projects in Jiangsu Province(Grant No.JXQC-36).
文摘The integrated hydraulic transformer has a compact structure and no throttling loss in the process of pressure regulation.It is widely used in the common pressure rail hydrostatic transmission system.The integrated hydraulic transformer is realized by designing more than three ports on the distribution plate,and the voltage transformation characteristics of the integrated hydraulic transformer with different port numbers are different.In this paper,the influence of port number on the pressure ratio of integrated hydraulic transformer was studied,and the pressure ratio characteristics of 3⁃ports,4⁃ports,and 5⁃ports integrated hydraulic transformer were obtained,and an experimental platform was built for experimental verification,which shows that the simulation results are consistent with the experimental results and provides a theoretical basis for the design of integrated hydraulic transformer.
文摘Objective: to carry out in-depth analysis of the common problems in the current conventional HPLC inspection, and put forward targeted solution measures to effectively improve the accuracy of the conventional HPLC inspection, and to ensure the smooth development of the laboratory work. Methods: the main problems of routine high performance liquid chromatography were that the number of theoretical plates was not satisfactory, the peak area of the tested substance in the test sample suddenly increased or the peak type was abnormal, the peak of the control sample was multi peak and the difference of resolution. Conclusion: routine HPM tests directly affect the test accuracy, and adjusting the details of routine HPM tests can effectively improve the quality of routine FAPM tests.
基金supported by the National Natural Science Foundation of China(No.21976171,41905115)the CAS Strategic Priority Research Program(XDA23020301)+1 种基金the Guangxi Key Research and Development Program(GuikeAB21220063)the Ministry of Science and Technology of the People's Republic of China(2016YFE0112200),and Guangxi First-class Disciplines(Agricultural Resources and Environment).
文摘Effective monitoring of atmospheric concentrations is vital for assessing the Stockholm Convention's effectiveness on persistent organic pollutants(POPs).This task,particularly challenging in polar regions due to low air concentrations and temperature fluctuations,requires robust sampling techniques.Furthermore,the influence of temperature on the sampling efficiency of polyurethane foam discs remains unclear.Here we employ a flow-through sampling(FTS)column coupled with an active pump to collect air samples at varying temperatures.We delved into breakthrough profiles of key pollutants,such as polycyclic aromatic hydrocarbons(PAHs),polychlorobiphenyls(PCBs),and organochlorine pesticides(OCPs),and examined the temperature-dependent behaviors of the theoretical plate number(N)and breakthrough volume(VB)using frontal chromatography theory.Our findings reveal a significant relationship between temperature dependence coefficients(K_(TN),K_(TV))and compound volatility,with decreasing values as volatility increases.While distinct trends are noted for PAHs,PCBs,and OCPs in KTN,KTV values exhibit similar patterns across all chemicals.Moreover,we establish a binary linear correlation between log(V_(B)/m^(3)),1/(T/K),and N,simplifying breakthrough level estimation by enabling easy conversion between N and VB.Finally,an empirical linear solvation energy relationship incorporating a temperature term is developed,yielding satisfactory results for N at various temperatures.This approach holds the potential to rectify temperature-related effects and loss rates in historical data from long-term monitoring networks,benefiting polar and remote regions.
