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Numerical study on morphological characteristics of rotational natural supercavitation by rotational supercavitating evaporator with optimized blade shape

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Journal of Hydrodynamics 2020年第3期32卷 468-485页

作者： Zhi-ying Zheng Qian li Lu Wang li-ming Yao Wei-hua Cai Hui li feng-chen li School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Department of Nuclear Engineering Kyoto UniversityKyotoJapan College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China Institute of Advanced Technology Heilongjiang Academy of SciencesHarbin 150020China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China

In view of the supercavitation effect, a novel device named the rotational supercavitating evaporator (RSCE) has been designed for the desalination. In order to improve the blade shape of the rotational cavitator in the RSCE for the performance optimization, the blade shapes of different sizes are designed by utilizing the improved calculation method for the blade shape and the validated empirical formulae based on previous two-dimensional numerical simulations, from which the optimized blade shape with the wedge angle of 45° and the design speed of 5 000 r/min is selected. The estimation method for the desalination performance parameters is developed to validate the feasibility of the utilization of the results obtained by the two-dimensional numerical simulations in the design of the three-dimensional blade shape. Three-dimensional numerical simulations are then conducted for the supercavitating flows around the rotational cavitator with the optimized blade shape at different rotational speeds to obtain the morphological characteristics of the rotational natural supercavitation. The results show that the profile of the supercavity tail is concaved toward the inside of the supercavity due to the re-entrant jet. The empirical formulae for estimating the supercavity size with consideration of the rotation are obtained by fitting the data, with the exponents different from those obtained by the previous two-dimensional numerical simulations. The influences of the rotation on the morphological characteristics are analyzed from the perspectives of the tip and hub vortices and the interaction between the supercavity tail and the blade. Further numerical simulation of the supercavitating flow around the rotational cavitator made up by the blades with exit edge of uniform thickness illustrate that the morphological characteristics are also affected by the blade shape.

关键词： Rotational natural supercavitation morphological characteristics blade shape computational fluid dynamics(CFD)numerical simulation rotational supercavitating evaporator

Electrophysiological changes of autonomic cells in left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with chronic heart failure

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Asian Pacific Journal of Tropical Medicine 2017年第12期10卷 1197-1200页

作者： ling Fan li-feng chen Jing Fan Department of Hematology The First Affiliated Hospital of Hebei North University Department of Physiology Basic Medical College Hebei North University Department of Obstetrics and Gynecology The Sixth Hospital of Zhangjiakou

Objective: To investigate the electrophysiological changes of autonomic cells in left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with chronic heart ***: Guinea pigs model of iron deficiency anemia complicated with chronic heart failure in 10 guinea pigs of the experimental group was made by feeding a low iron diet,pure water and subcutaneous injection of isoproterenol. The control group consisting of 11 guinea pigs was given normal food, normal water and injected with normal saline. The left ventricular outflow tract model specimen was also prepared. The standard microelectrode technique was used to observe electrophysiological changes of autonomic cells in the outflow tract of left ventricular heart failure complicated with iron deficiency anemia in guinea pig model. The indicators of observation were maximal diastolic potential, action potential amplitude, 0 phase maximal depolarization velocity, 4 phase automatic depolarization velocity, repolarization 50% and 90%, and spontaneous discharge ***: Compared with the control group, 4 phase automatic depolarization velocity,spontaneous discharge frequency and 0 phase maximal depolarization velocity decreased significantly(P litude reduced(P lities of the left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with heart failure.

关键词： Iron deficiency anemia Chronic heart failure Guinea pig model Autonomic cells Left ventricular outflow tract Electrophysiology

Biotemplated synthesis of three-dimensional porous MnO/C-N nanocomposites from renewable rapeseed pollen： An anode material for lithium-ion batteries

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Nano Research 2017年第1期10卷 1-11页

作者： li-feng chen Sheng-Xiang Ma Shu Lu Yue feng Jia Zhang Sen Xin Shu-Hong Yu Division ofNanomatefials & Chemistry Hefei National Laboratory for Physical Sciences at Microscale Collaborative Innovation Center of Suzhou Nano Science and Technology CAS Center for Excellence in Nanoscience Department of Chemistry Department of Materials Science & Engineering University of Science and Technology of China Hefei 230026 China Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering School of Chemical Engineering Hefei University of Technology Hefei 230009 China

lithium-ion batteries （liBs） are currently recognized as one of the most popular power sources available. To construct advanced liBs exhibiting long-term endurance, great attention has been paid to enhancing their poor cycle stabilities. As the performance of liBs is dependent on the electrode materials employed, the most promising approach to improve their life span is the design of novel electrode materials. We herein describe the rational design of a three-dimensional （3D） porous MnO/C-N nanoarchitecture as an anode material for long cycle life liBs based on their preparation from inexpensive, renewable, and abundant rapeseed pollen （R-pollen） via a facile immersion-annealing route. Remarkably, the as-prepared MnO/C-N with its optimized 3D nanostructure exhibited a high specific capacity （756.5 mAh·g^-1 at a rate of 100 mA·g^-1）, long life span （specific discharge capacity of 513.0 mAh·g^-1, -95.16% of the initial reversible capacity, after 400 cycles at 300 mA·g^-1）, and good rate capability. This material therefore represents a promising alternative candidate for the high-performance anode of next-generation liBs.

关键词： 3D porous MnO/C-Nnanocomposite rapeseed pollen renewable biomass lithium-ion batter long cycle life

Effects of probiotic therapy on hepatic encephalopathy in patients with liver cirrhosis:an updated meta-analysis of six randomized controlled trials

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Hepatobiliary & Pancreatic Diseases International 2014年第4期13卷 354-360页

作者： Jun Xu Rui Ma li-feng chen li-Jun Zhao Kan chen Ren-Bing Zhang Department of Surgery Zhejiang University Hospital Zhejiang University

BACKGROUND： liver cirrhotic patients with hepatic encephalopathy have poor prognosis. Probiotics alter the intestinal microbiota and reduce the production of ammonia. We conducted a meta-analysis about the role of probiotics on liver cirrhotic patients with hepatic *** SOURCES： We collected the relevant literatures up to February 21, 2014 from databases of PubMed, EMBASE and the Cochrane Central Register of Controlled Trials. A statistical analysis was conducted by RevMan 5.2 and STATA 12.0 ***： Six randomized controlled trials involving 496 liver cirrhotic patients were included. The results showed that probiotic therapy significantly reduced the development of overt hepatic encephalopathy（OR [95% CI]： 0.42 [0.26, 0.70],P=0.0007）. However, probiotics did not affect mortality, levels of serum ammonia and constipation（mortality： OR [95% CI]：0.73 [0.38, 1.41], P=0.35; serum ammonia： WMD [95% CI]：-3.67 [-15.71, 8.37], P=0.55; constipation： OR [95% CI]： 0.67 [0.29,1.56], P=0.35）.CONCLUSION： Probiotics decrease overt hepatic encephalopathy in patients with liver cirrhosis.

关键词： probiotics hepatic encephalopathy liver cirrhosis ammonia meta-analysis

Gradual or Hysteretic Transition:Anion Effects on Cobalt(II)Spin Crossover Complexes

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Chinese Journal of Chemistry 2024年第19期42卷 2381-2390页

作者： Yu-chen Sun Ying-lian li cheng-cheng Zhang feng-li chen Dong Shao Yue Zhao Hai-Yan Wei Xin-Yi Wang State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced MicrostructuresSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu 210023China Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials ScienceNanjing Normal UniversityNanjingJiangsu 210023China Hubei Key Laboratory of Processing and Application of Catalytic Materials College of Chemistry and Chemical EngineeringHuanggang Normal UniversityHuanggangHubei 438000China

Comprehensive Summary To better understand the impact of different anions on the structures and SCO properties of the CoII SCO complexes,six new complexes[Co(terpy-CH_(2)OH)_(2)]A_(2)·sol(terpy-CH_(2)OH=4′-(hydroxymethyl)-2,2′;6′,2″-terpyridine,A=Br^(–)(1,sol=1.5H_(2)O),I^(–)(2),N_(3)^(–)(3,sol=2H_(2)O),H_(3)BCN^(–)(4),OTf^(–)(5),and TsO^(–)(6,sol=4H_(2)O·CH_(3)CN),have been synthesized and *** six compounds consist of mononuclear[Co(terpy-CH_(2)OH)_(2)]^(2+)cations and charge-balancing anions that differ in size,shape,and hydrogen bonding *** 1,2,3,and 6 displayed incomplete gradual SCO transitions,whereas 4 and 5 exhibited abrupt hysteretic spin transitions with loops of 12 and 16 K(250.0—262.0 K for 4,and 370.0—386.0 K for 5,respectively),closely resembling our previously reported complexes with SCN^(–)and SeCN^(–)*** occurrence of the order-disorder transition of the CH2OH groups and their transition temperatures are determined by the size and hydrogen bonding capability of the ***,the transition temperatures of complexes with H_(3)BCN^(–),SCN^(–),OTf^(–),and SeCN^(–)anions exhibit an upward trend as the size and mass of the anions increase,as confirmed through detailed single crystal structure analyses conducted in both high-spin and low-spin states for all four complexes.

关键词： Cobalt Solid-state structures Magnetic properties Spin crossover Anion effect

Precise separation and efficient recovery of Pd(Ⅱ)from high-level liquid waste by XAD-based adsorbents

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Rare Metals 2024年第10期43卷 5372-5390页

作者： Hao-Ran Dong Shun-Yan Ning Zeng-Yuan li Si-Zhi Xu feng-Tao Hu feng Gao You-Bin Wang li-feng chen Xiang-Biao Yin Toyohisa Fujita Mohammed FHamza Yue-Zhou Wei School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China School of Nuclear Science and Technology University of South ChinaHengyang 421001China

Efficient separation of palladium(Pd(Ⅱ))from high-level liquid waste(HLLW)not only helps the safe disposal of nuclear waste,but also is a vital importan supplement to Pd(Ⅱ)***,16 kinds of nove Amberlite XAD resins-based adsorbents were prepared by vacuum impregnation method for the separation of Pd(Ⅱ)from simulated HLLW,and the MMBT/XAD7HP prepared using 4-methyl-2-mercaptobenzothiazole(MMBT)as ligand and Amberlite XAD7HP resin(XAD7HP)as the carrier was selected as the optimal research *** analysis experiments proved the successful preparation of MMBT/XAD7HP,which exhibited ultrahigh adsorption selectivity for Pd(Ⅱ)(distribution coefficient(K_d)≥12584.5 ml·g^(-1),separation factor(SF_(Pd/M))≥2818.4)and superior adsorption capacity(Q≥130.1 mg·g^(-1)).The adsorption kinetics and adsorption isotherms for Pd(Ⅱ)matched with pseudo-secondorder(PSO)kinetics model and Langmuir model,indicating that the adsorption mode for Pd(Ⅱ)by MMBT/XAD7 HP was monolayer chemical *** dynamic column experiments showed that MMBT/XAD7 HP achieved efficiently separation of Pd(Ⅱ)from simulated HLLW,and the recovery rate was nearly 100% The adsorption mechanism was analyzed by Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and density functional theory(DFT),and the ultrahigh selectivity of MMBT/XAD7 HP is attributed to the preferred affinity of the soft-N,S donor atoms in MMBT for Pd(Ⅱ).MMBT has the shortest frontline molecular orbital energy band gap(HOMO-LUMO)among the four ligands,which makes it easier to become an electron donor to attract Pd^(2+)to participate in ***_(3)^(-)participates in the adsorption to keep charge *** summary,MMBT/XAD7 HP has broad application prospects for the treatment of Pd(Ⅱ)in HLLW.

关键词： XAD Palladium HLLW Adsorption Column experiments

Simultaneous Determination of Gold and Platinum by Double Artificial Neural Network Analysis with Flow-injection Chemiluminescence

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Chinese Chemical Letters 2006年第10期17卷 1343-1346页

作者： Ming Yang liU Hai Tao ZHANG Jun feng li Shu Gui chen Hong Yan WANG College of chemistry Jilin University Changchun 130012

A highly sensitive double artificial neural network （DANN） analysis with flow-injection chemiluminescence （FI-CL） has been developed to simultaneously determine the trace amounts of the gold and platinum in simula... 详细信息

关键词： Double artificial neural networks flow-injection chemiluminescence simultaneous determination gold and platinum.

Effect of iron overload on electrophysiology of slow reaction autorhythmic cells of left ventricular outflow tract in guinea pigs

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Asian Pacific Journal of Tropical Medicine 2018年第2期11卷 151-154页

作者： ling Fan li-feng chen Jing Fan Lan-Ping Zhao Xiao-Yun Zhang Department of haematology the First Affiliated Hospital of Hebei North University Department of Physiology Basic Medical College Hebei North University Department of Obstetrics and Gynecology the Sixth Hospital of Zhangjiakou

Objective: To investigate the electrophysiology effects and mechanism of iron overload on the slow response autorhythmic cells in the left ventricular outflow tract of guinea ***: Standard microelectrode cell recording techniques were adopted to observe the electrophysiological effects of different concentrations of Fe^(2+)(100 μmol/L, 200 μmol/L) on the left ventricular outflow tract autorhythmic *** tissues were perfused with FeSO_4(200 μmol/L) combing with CaCl_2(4.2 mmol/L), Verapamil,(1 μmol/L), and nickel chloride(200μmol/L) respectively to observe the influences of these contents on electrophysiology of FeSO_4(200μmol/L) on the left ventricular outflow tract autorhythmic ***: Fe^(2+)at both 100 μmol/L and 200 μmol/L could change the electrophysiological parameters of the slow response autorhythmic cells of the left ventricular outflow tract in a concentrationdependent manner resulting into decrease in Vmax, APA and MDP, slower RPF and VDD, and prolonged APD_(50) and APD_(90)(P all <0.05).Besides, perfusion of increased Ca^(2+) concentration could partially offset the electrophysiological effects of Fe^(2+)(200 μmol/L).The L-type calcium channel(LTCC) blocker Verapamil(1 μmol/L) could block the electrophysiological effects of Fe^(2+)(200 μmol/L).But the T-type calcium channel(TTCC) blocker nickel chloride(NiCl_2, 200 μmol/L) could not block the electrophysiological effects of Fe^(2+)(200 μmol/L).Conclusions: Fe^(2+) can directly change the electrophysiological characteristics of the slow response autorhythmic cells of the left ventricular outflow tract probably through the L-type calcium channel.

关键词： Iron overload Iron poisoning Left ventricular outflow tract Slow reaction autorhythmic cell Electrophysiology

Efficacy and Safety of Generic Dasatinib as a Second-line Treatment for Patients with Chronic Myeloid Leukemia:a Multicenter Retrospective Study in Hubei Province,China

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Current Medical Science 2018年第6期38卷 1005-1011页

作者： li-feng chen Guo-lin YUAN Zhao-dong ZHONG Ping ZOU Deng-ju li Yin BAO Hong-bo REN li MENG Wei-ming li Department of Hematology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Hematology Xiangyang Central HospitalXiangyang 441000China Department of Hematology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Hematology Xiangyang No.1 People's HospitalXiangyang 441000China Department of Hematology the First People's Hospital of JingzhouJingzhou 434000China

Dasatinib is a second-generation tyrosine kinase inhibitor (TKI)and it could be used as a second-line treatment for patients with chronic myeloid leukemia (CML).Yinishu,a generic dasatinib made in China,was approved by the China Food and Drug Administration in 2013 and it costs much less than the patented dasatinib *** present study aimed to examine the efficacy and safety of Yinishu as a second-line treatment for CML by comparing the baseline clinical characteristics,rates of adverse events and efficacy between Yinishu and SPRYCEL groups. The results showed that there were no significant differences in the rates of optimal response between Yinishu and SPRYCEL for patients who started second-line treatment because of treatment *** patients who started second-line treatment because of intolerance of first-line treatment, their levels of BCR-ABL1/ABL1 on the international scale (BCR-ABL^IS)was maintained very low throughout the course of Yinishu ***-related adverse events occurred with the same frequency in these two *** was confirmed that Yinishu was effective and safe as a second- line treatment for CML *** may be more suitable for patients who are economically unable to pay for the patented dasatinib SPRYCEL.

关键词： chronic myeloid leukemia generic dasatinib second-line treatment efficacy safety