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Identification and analysis of the inlet vortex of an axial-flow pump

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Journal of Hydrodynamics 2022年第2期34卷 234-243页

作者： Wen-peng Zhang Li-jian Shi fang-ping Tang Zhuang-zhuang Sun Ye Zhang College of Hydraulic Science and Engineering Yangzhou UniversityYangzhou225009China

Axial-flow pumps are widely employed in urban flood control and drainage pumping *** inlet vortex is one factor that seriously threaten the safe,stable and efficient operation of axial-flow pump *** this paper,the vortex recognition performances of two vortex identification methods,the Q—criterion and Liutex methods,are compared based on an axial-flow pump,and the interactions between the impeller and vortex are explored.A flat plate vortex generator is installed in front of the impeller to continuously induce a stable *** numerical simulation results show that the Liutex method can not only simultaneously identify strong and weak vortices but also reduce the influence of shear force at the *** vortex and the impeller influence each *** the influence of rotating blades,the vortex changes from a low frequency to the blade frequency,and the vortex significantly changes the tangential velocity inside the *** accuracy of the numerical simulation results is verified by experiments on the external and internal characteristics.

关键词： Axial-flow pump inlet vortex vortex identification vortex generator numerical simulation experiment

Effect of music therapy on chemotherapy-induced nausea and vomiting in gastrointestinal cancer:A systematic review and metaanalysis

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World Journal of Gastrointestinal Surgery 2023年第3期15卷 471-479页

作者： fang-ping Zhong Jun Zhong Ming-Yan Zhong Department of Oncology Pingxiang Second People’s HospitalPingxiang 337000Jiangxi ProvinceChina School of Biomedical Engineering Guangzhou Medical UniversityGuangzhou 511436Guangdong ProvinceChina

BACKGROUND Chemotherapy is the primary treatment for patients with advanced gastrointestinal cancer,but it has many adverse reactions,particularly nausea and *** therapy can reduce anxiety symptoms,avoid the response to the human body under various stress conditions through psychological adjustment,and improve the adverse reactions of *** To investigate the impact of music therapy on relieving gastrointestinal adverse reactions in chemotherapy for patients with digestive tract cancer by *** EMBASE,PubMed,OVID,WoS,CNKI,CBM,and VIP database were all used for searching relevant literature,and the efficacy after treatment was combined for analysis and *** This study included seven *** results of meta-analysis indicated that music therapy could reduce the nausea symptom score of patients after chemotherapy[mean difference(MD)=-3.15,95%confidence interval(CI):-4.62 to-1.68,Z=-4.20,P0.05).CONCLUSION Music therapy can significantly improve the scores of nausea and vomiting symptoms in patients with digestive system cancer during chemotherapy and reduce the incidence of grade I and above nausea and vomiting after chemotherapy,making it an effective psychological intervention method worthy of clinical promotion.

关键词： Music therapy Gastrointestinal cancer Nausea and vomiting Gastrointestinal reactions

Study on Performance of Savonius Rotor Type Wave Energy Converter Used in Conjunction with Floating Breakwater

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China Ocean Engineering 2021年第4期35卷 578-587页

作者： LIU Zuo-shi GONG Kai HUANG fang-ping HUANG Yan-chen School of Mechanical and Electrical Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Ningbo Institute of Technology Zhejiang UniversityNingbo 315100China School of Mechanical Engineering Zhejiang UniversityHangzhou 310027China

In the present study,the performance characteristics of a Savonius rotor type wave energy converter used in conjunction with a conventional double-buoy floating breakwater is investigated using physical model *** Savonius rotor type converter is suspended under the double-buoy floating breakwater to achieve wave attenuation while generating electricity,thereby enhancing the overall wave-elimination effect of the *** Savonius rotor is tested with different water submergence depths,and a reasonable relative submergence depth is determined within the scope of the research *** hydrodynamics and energy capture performance of the combined breakwater with four different sizes of Savonius rotor under different wave conditions are studied,and the transmission coefficient of the experimental device is *** results show that when the optimal relative submergence depth is 0.65D,where D is the impeller diameter,there is a correspondence between the optimal performance of Savonius rotor with different rotor sizes and the wave period and wave *** optimal energy capture efficiency of the wave energy converter reaches 17%−20.5%,and the transmission coefficient is reduced by 35%−45%compared with the conventional double-buoy breakwater.

关键词： floating breakwater Savonius rotor energy capture efficiency transmission coefficient

Potentials of classical force fields for interactions between Na^+ and carbon nanotubes

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Chinese Physics B 2018年第9期27卷 639-644页

作者： De-Yuan Li Guo-Sheng Shi Feng Hong Hai-ping fang Department of Physics and Shanghai Applied Radiation Institute Shanghai UniversityShanghai 200444China Division of Interfacial Water and Key Laboratory of Interracial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China

Carbon nanotubes （CNTs） have long been expected to be excellent nanochannels for use in desalination membranes and other bio-inspired human-made channels owing to their experimentally confirmed ultrafast water flow and theoretically predicted ion rejection. The correct classical force field potential for the interactions between cations and CNTs plays a cru- cial role in understanding the transport behaviors of ions near and inside the CNT, which is key to these expectations. Here, using density functional theory calculations, we provide classical force field potentials for the interactions of Na＋/hydrated Na＋ with （7,7）, （8,8）, （9,9）, and （10,10）-type CNTs. These potentials can be directly used in current popular classical soft- ware such as nanoscale molecular dynamics （NAMD） by employing the tclBC interface. By incorporating the potential of hydrated cation-g interactions to classical all-atom force fields, we show that the ions will move inside the CNT and accu- mulate, which will block the water flow in wide CNTs. This blockage of water flow in wide CNTs is consistent with recent experimental observations. These results will be helpful for the understanding and design of desalination membranes, new types of nanofluidic channels, nanosensors, and nanoreactors based on CNT platforms.

关键词： carbon nanotube density functional theory force field molecular dynamics simulation

基于下丘脑-垂体-肾上腺轴对比杂交天麻及其亲本醇提物镇静催眠药效学研究

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中南药学 2024年第4期22卷 871-877页

作者：高翰博王广政巩晴晴俞年军方悦杜方平安徽中医药大学药学院合肥230012 安徽省中医药科学院中药资源保护与开发研究所合肥230012 食药用菌功能活性与资源利用安徽省联合共建学科重点实验室安徽六安237300 省部共建安徽道地中药材品质提升协同创新中心合肥230012 中药研究与开发安徽省重点实验室合肥230012 金寨县金山寨食(药)用菌种植专业合作社安徽六安237399

目的基于下丘脑-垂体-肾上腺轴(HPA轴)和单胺类神经递质水平研究比较杂交天麻及其亲本醇提物镇静催眠药效。方法连续4 d对小鼠腹腔注射对氯苯丙氨酸(PCPA)造失眠模型,造模同期给药。以阳性药艾司唑仑、杂交天麻及其亲本(红天麻、乌天... 详细信息

目的基于下丘脑-垂体-肾上腺轴(HPA轴)和单胺类神经递质水平研究比较杂交天麻及其亲本醇提物镇静催眠药效。方法连续4 d对小鼠腹腔注射对氯苯丙氨酸(PCPA)造失眠模型,造模同期给药。以阳性药艾司唑仑、杂交天麻及其亲本(红天麻、乌天麻)醇提取物、天麻素给药,7 d后检测腹腔注射戊巴比妥钠诱导小鼠的睡眠发生率、睡眠潜伏期及睡眠时间;苏木精-伊红染色法(HE)染色观察小鼠大脑相关组织的病变,ELISA法检测机体中单胺类神经递质5-羟色胺(5-HT)、去甲肾上腺素(NE)、多巴胺(DA)含量水平及HPA轴激素及血清中γ-氨基丁酸(GABA)水平。结果 PCPA致失眠小鼠造模成功,各组天麻醇提取物均可改善失眠小鼠行为异常,缓解失眠小鼠脑组织病变,促进机体内5-HT、DA表达量的回调;抑制血清中NE水平及机体内促肾上腺皮质激素释放激素(CRH)、促肾上腺皮质激素(ACTH)、皮质酮(CORT)水平升高,促进机体GABA水平提高。杂交天麻对单胺类神经递质的调节作用优于红天麻;抑制HPA轴亢奋与提升机体内GABA水平作用优于乌天麻。结论杂交天麻及其亲本醇提物均可通过抑制HPA轴亢奋与调节机体内单胺类神经递质紊乱缓解失眠症状。杂交天麻综合疗效与亲本相近,可在后续药效学研究中提供数据以便参考。

关键词：杂交天麻镇静催眠药效差异 HPA轴 5-羟色胺

EFFECTS OF AQUATIC VEGETATION ON FLOW IN THE NANSI LAKE AND ITS FLOW VELOCITY MODELING

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Journal of Hydrodynamics 2006年第6期18卷 640-648页

作者： WANG Chao ZHU ping WANG Pei-fang ZHANG Wen-ming Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationCollege of Environmental Science and Engineering Hohai University Nanjing 210098 China

Aquatic vegetation has significant effects on flow in waters. In this article, four types of water areas were analyzed according to the field survey on water depth and vegetation in the Nansi Lake for the East Line Project of Water Transfer from South to North in China （WTSNC）. The depth-averaged 2-D hydrodynamic models with and without consideration of the effects of aquatic vegetation on flow were established to simulate flow fields in vegetated and non-vegetated zones in the Nansi Lake. With the established models, flow fields were predicted under the conditions of water transfer from south to north. The results indicate that when the drag force term exerted by aquatic vegetation is considered, the computed velocities agree well with the measured data, whereas as the drag term is taken into account, the computed velocities are obviously larger than the measured data in the vegetated zone and considerably smaller in the non-vegetated zone, and the error range between the two velocities is large if this problem is dealt with the method of increasing the roughness coefficient of the lake-bed to reflect the vegetation drag force. In addition, it is demonstrated that the emerged vegetation exerts larger effects on flow than submerged vegetation comparing the results in the Emerged Vegetation （reed） Zone （EVZ） and the Submerged Vegetation Zone （SVZ）.

关键词： Nansi Lake aquatic vegetation drag force,flow modeling

Dynamics of vascular volume and hemodilution of lactated Ringer’s solution in patients during induction of general and epidural anesthesia

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第9期7卷 738-744页

作者： LI Yu-hong LOU Xian-feng BAO fang-ping Department of Anesthesiology the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 3 10003 china Department of Orthopedics the First Affiliated Hospital School of Medicine Zhejiang university Hangzhou 310003 china

Objective： To investigate the dynamics of vascular volume and the plasma dilution of lactated Ringer＇s solution in patients during the induction of general and epidural anesthesia. Methods： The hemodilution of i.v. infusion of 1000 ml of lactated Ringer＇s solution over 60 min was studied in patients undergoing general （n=31） and epidural （n= 22） anesthesia. Heart rate, arterial blood pressure and hemoglobin （Hb） concentration were measured every 5 rain during the study. Surgery was not started until the study period had been completed. Results： General anesthesia caused the greater decrease of mean arterial blood pressure （MAP）（mean 15% versus 9%; P〈0.01） and thereby followed by a more pronounced plasma dilution, blood volume expansion （VE） and blood volume expansion efficiency （VEE）. A strong linear correlation between hemodilution and the reduction in MAP （r=-0.50;P〈0.01） was found. At the end of infusion, patients undergoing general anesthesia retained 47% （SD 19%） of the infused fluid in the circulation, while epidural anesthesia retained 29% （SD 13%）（P〈0.001）. Correspondingly, a fewer urine output （mean 89 ml versus 156 ml; P〈0.05） and extravascular expansion （454 ml versus 551 ml; P〈0.05） were found during general anesthesia. Conclusion： We concluded that the induction of general anesthesia caused more hemodilution, volume expansion and volume expansion efficiency than epidural anesthesia, which was triggered only by the lower MAP.

关键词： Hemodilution Volume expansion Ringer's solution General anesthesia Epidural anesthesia

Effcts of Irrigation Patterns and Nitrogen Fertilization on Rice Yield and Microbial Community Structure in Paddy Soil

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Pedosphere 2012年第5期22卷 661-672页

作者： LI Ya-Juan CHEN Xing I.H.SHAMSI fang ping LIN Xian-Yong Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058(China) Zhejiang Provincial Key Laboratory of Subtropical Soil Science and Plant Nutrition College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058(China)

Water and nitrogen （N） are considered the most important factors affecting rice production and play vital roles in regulating soil microbial biomass, activity, and community. The effects of irrigation patterns and N fertilizer levels on the soil microbial community structure and yield of paddy rice were investigated in a pot experiment. The experiment was designed with four N levels of 0 （NO）, 126 （N1）, 157.5 （N2）, and 210 kg N ha^（-1）（N3） under two irrigation patterns of continuous water-logging irrigation （WLI） and water- controlled irrigation （WCI）. Phospholipid fatty acid （PLFA） analysis was conducted to track the dynamics of soil microbial communities at tillering, grain-filling, and maturity stages. The results showed that the maximums of grain yield, above-ground biomass, and total N uptake were all obtained in the N2 treatment under WCI. Similar variations in total PLFAs, as well as bacterial and fungM PLFAs, were found, with an increase from the tillering to the grain-filling stage and a decrease at the maturity stage except for actinomycetic PLFAs, which decreased continuously from the tillering to the maturity stage. A shift in composition of the microbial community at different stages of the plant growth was indicated by principal component analysis （PCA）, in which the samples at the vegetative stage （tillering stage） were separated from those at the reproductive stage （grain-filling and maturity stages）. Soil microbial biomass, measured as total PLFAs, was significantly higher under WCI than that under WLI mainly at the grain-filling stage, whereas the fungal PLFAs detected under WCI were significantly higher than those under WLI at the tillering, grain-filling, and maturity stages. The application of N fertilizer also significantly increased soil microbial biomass and the main microbial groups both under WLI and WCI conditions. The proper combination of irrigation management and N fertilizer level in this study was the N2 （157.5 kg N ha^（-1）） treatmen

关键词： irrigation management nitrogen levels phospholipid fatty acid rice growth stage soil microorganism

Electronic Properties of Bilayer Zigzag Graphene Nanoribbons:First Principles Study

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Chinese Physics Letters 2011年第4期28卷 194-196页

作者： OUYANG fang-ping CHEN Li-Jian XIAO Jin ZHANG Hua School of Physics Science and Technology Central South UniversityChangsha 410083 College of Chemistry and Molecular Engineering and Beijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871

Based on the density functional theory,we calculate the dependence of the band structures of bilayer ziezaff-edzed grapnene nanonooons(BZGNRs)upon ribbon width,interlayer distance and stacking *** monolayer zigzag GNR,whose energy gap is always zero under different ribbon widths,the gap of BZGNR varies greathy with the ribbon width or the interlayer *** greatest gaps for AA-stacking and AB-stacking BZGNRs are about 0.22eV and 0.12eV,respectively,which implies that gap-tuning of AA-BZGNRs is more effective than that of *** results present a way to tune the band structures of BZGNRs and also provide theoretical guidance for the fabrication of GNR-based piezoelectric devices.

关键词： interlayer piezoelectric layer