Metal phosphosulfides have been recognized as advanced anode materials for sodium/potassium ion batteries due to their high theoretical capacities and the incorporation of the advantage of metal sulfides and phosphate...Metal phosphosulfides have been recognized as advanced anode materials for sodium/potassium ion batteries due to their high theoretical capacities and the incorporation of the advantage of metal sulfides and phosphates. However, they also suffer from the shortcomings of frustrating cycling stability due to the large volume expansion and unsatisfactory electrical conductivity. Herein, hexapod cobalt phosphosulfide nanodots based nanorods encapsulating into N, P, and S hetero-atoms tri-doped carbon framework(Co P/CoS_(2) @NPSC) have been triumphantly designed and synthesized. The six nanorods constructed hexapod framework and multi-atom doped carbon matrix not only provides more active sites, but also contribute to maintain the structure integrity from avoiding the agglomeration of internal Co P and CoS_(2) nanodots. The synergistic effect between Co P and CoS_(2) components, as well as the Co P/CoS_(2) and the NPSC carbon framework can improve the electrochemical conductivity. Besides, the kinetics analysis demonstrated that N/P/S tri-doping could greatly increase the interlayer distance and introduce enough active sites, which effectively facilitate the transport, adsorption, insertion and diffusion of Na^(+)and K^(+).Co P/CoS_(2) @NPSC demonstrated excellent electrochemical properties and battery performances including excellent cycle stability with 404.63 m Ah/g at 5.0 A/g around 700 cycles for SIBs and 115.33 m Ah/g at5.0 A/g around 800 cycles for PIBs. This presented strategy establishes a novel and adaptable method for the integration of doped carbon with metal phosphosulfide and guides a new research approach and direction for secondary batteries electrode materials.展开更多
A simple and sensitive high performance liquid chromatography method using fluorescence detection （HPLC- FLD） and a one-step single solvent extraction for the determination of prazosin（PZS） in dog plasma is develo...A simple and sensitive high performance liquid chromatography method using fluorescence detection （HPLC- FLD） and a one-step single solvent extraction for the determination of prazosin（PZS） in dog plasma is developed and validated. After extraction with ether, the chromatographic separation of PZS is carried out using a reverse phase C18 column （ 150 mm ×4.6 mm, 5 μm） with a mobile phase of 30% acetonitrile and 70% acetic acid-sodium acetate buffer solution （pH = 3.6） and quantified by fluorescence detection operated with an excitation wavelength of 258 nm and an emission wavelength of 387 nm. The flow rate of the mobile phase is 1.0 mL/min and the retention time of PZS and the internal standard is found to be 4. 4 and 5. 8 rain, respectively. The calibration curve is linear within a concentration range from 1.0 to 1 000.0 ng/mL （ P 〉 0. 998）. The limit of detection is 0.4 ng/mL. The inter-day coefficient of variation （COV） of the calibration standards is below 5.0% and the mean accuracy is in the range from 92. 7% to 104. 2%. Moreover, by analyzing quality control plasma samples for three days, the results show that the method is precise and accurate, for the intra- and inter- day COV within 10% and the accuracy from 95.9% to 112.7%. The developed and validated method is successfully applied to phannacokinetic study for the preclinical evaluation of a new peroral PZS-sulfobutyl ether beta-cyclodextrin （PZS-SBE-β-CD） inclusion complex tablets （test preparation）, which demonstrates that the test preparation released PZS is conducted in a slow and controlled way, and the relative bioavailability of the test preparation is found to be 105.0%.展开更多
To investigate the distribution and velocity attributes of gas hydrates in the northern continental slope of South China Sea, Guangzhou Marine Geological Survey conducted four-component （4C） ocean-bottom seismometer...To investigate the distribution and velocity attributes of gas hydrates in the northern continental slope of South China Sea, Guangzhou Marine Geological Survey conducted four-component （4C） ocean-bottom seismometer （OBS） surveys. A case study is presented to show the results of acquiring and processing OBS data for detecting gas hydrates. Key processing steps such as repositioning, reorientation, PZ summation, and mirror imaging are discussed. Repositioning and reorientation find the correct location and direction of nodes. PZ summation matches P- and Z-components and sums them to separate upgoing and downgoing waves. Upgoing waves are used in conventional imaging, whereas downgoing waves are used in mirror imaging. Mirror imaging uses the energy of the receiver ghost reflection to improve the illumination of shallow structures, where gas hydrates and the associated bottom-simulating reflections （BSRs） are located. We developed a new method of velocity analysis using mirror imaging. The proposed method is based on velocity scanning and iterative prestack time migration. The final imaging results are promising. When combined with the derived velocity field, we can characterize the BSR and shallow structures; hence, we conclude that using 4C OBS can reveal the distribution and velocity attributes of gas hydrates.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 52472194, 52101243)Natural Science Foundation of Guangdong Province, China (No. 2023A1515012619)the Science and Technology Planning Project of Guangzhou (No. 202201010565)。
文摘Metal phosphosulfides have been recognized as advanced anode materials for sodium/potassium ion batteries due to their high theoretical capacities and the incorporation of the advantage of metal sulfides and phosphates. However, they also suffer from the shortcomings of frustrating cycling stability due to the large volume expansion and unsatisfactory electrical conductivity. Herein, hexapod cobalt phosphosulfide nanodots based nanorods encapsulating into N, P, and S hetero-atoms tri-doped carbon framework(Co P/CoS_(2) @NPSC) have been triumphantly designed and synthesized. The six nanorods constructed hexapod framework and multi-atom doped carbon matrix not only provides more active sites, but also contribute to maintain the structure integrity from avoiding the agglomeration of internal Co P and CoS_(2) nanodots. The synergistic effect between Co P and CoS_(2) components, as well as the Co P/CoS_(2) and the NPSC carbon framework can improve the electrochemical conductivity. Besides, the kinetics analysis demonstrated that N/P/S tri-doping could greatly increase the interlayer distance and introduce enough active sites, which effectively facilitate the transport, adsorption, insertion and diffusion of Na^(+)and K^(+).Co P/CoS_(2) @NPSC demonstrated excellent electrochemical properties and battery performances including excellent cycle stability with 404.63 m Ah/g at 5.0 A/g around 700 cycles for SIBs and 115.33 m Ah/g at5.0 A/g around 800 cycles for PIBs. This presented strategy establishes a novel and adaptable method for the integration of doped carbon with metal phosphosulfide and guides a new research approach and direction for secondary batteries electrode materials.
基金Pre-Research Foundation for the National Natural Science Foundation of Southeast University(No.9225000007)Suzhou Science and Technology Development Projects(No.YJS0948)
文摘A simple and sensitive high performance liquid chromatography method using fluorescence detection （HPLC- FLD） and a one-step single solvent extraction for the determination of prazosin（PZS） in dog plasma is developed and validated. After extraction with ether, the chromatographic separation of PZS is carried out using a reverse phase C18 column （ 150 mm ×4.6 mm, 5 μm） with a mobile phase of 30% acetonitrile and 70% acetic acid-sodium acetate buffer solution （pH = 3.6） and quantified by fluorescence detection operated with an excitation wavelength of 258 nm and an emission wavelength of 387 nm. The flow rate of the mobile phase is 1.0 mL/min and the retention time of PZS and the internal standard is found to be 4. 4 and 5. 8 rain, respectively. The calibration curve is linear within a concentration range from 1.0 to 1 000.0 ng/mL （ P 〉 0. 998）. The limit of detection is 0.4 ng/mL. The inter-day coefficient of variation （COV） of the calibration standards is below 5.0% and the mean accuracy is in the range from 92. 7% to 104. 2%. Moreover, by analyzing quality control plasma samples for three days, the results show that the method is precise and accurate, for the intra- and inter- day COV within 10% and the accuracy from 95.9% to 112.7%. The developed and validated method is successfully applied to phannacokinetic study for the preclinical evaluation of a new peroral PZS-sulfobutyl ether beta-cyclodextrin （PZS-SBE-β-CD） inclusion complex tablets （test preparation）, which demonstrates that the test preparation released PZS is conducted in a slow and controlled way, and the relative bioavailability of the test preparation is found to be 105.0%.
基金supported by the National Hi-tech Research and Development Program of China(863 Program)(Grant No.2013AA092501)the China Geological Survey Projects(Grant Nos.GZH201100303 and GZH201100305)
文摘To investigate the distribution and velocity attributes of gas hydrates in the northern continental slope of South China Sea, Guangzhou Marine Geological Survey conducted four-component （4C） ocean-bottom seismometer （OBS） surveys. A case study is presented to show the results of acquiring and processing OBS data for detecting gas hydrates. Key processing steps such as repositioning, reorientation, PZ summation, and mirror imaging are discussed. Repositioning and reorientation find the correct location and direction of nodes. PZ summation matches P- and Z-components and sums them to separate upgoing and downgoing waves. Upgoing waves are used in conventional imaging, whereas downgoing waves are used in mirror imaging. Mirror imaging uses the energy of the receiver ghost reflection to improve the illumination of shallow structures, where gas hydrates and the associated bottom-simulating reflections （BSRs） are located. We developed a new method of velocity analysis using mirror imaging. The proposed method is based on velocity scanning and iterative prestack time migration. The final imaging results are promising. When combined with the derived velocity field, we can characterize the BSR and shallow structures; hence, we conclude that using 4C OBS can reveal the distribution and velocity attributes of gas hydrates.
